JP6555437B1 - accessory - Google Patents

Abstract

An accessory capable of performing proper data communication with a camera body is provided. An accessory is an accessory that is attachable to a camera body and is communicable with the camera body, and transmits at least one piece of information related to a driven member in the accessory to the camera body. A transmission unit; and a reception unit that receives, from the camera body, a first value indicating information about the driven member that is transmitted to the camera body, wherein the first transmission unit has the first value Information on the driven member to be shown is transmitted to the camera body. [Selection] Figure 1

Description

  The present invention relates to accessories.

  2. Description of the Related Art Conventionally, there is a camera system that can attach an accessory represented by an interchangeable lens to a camera body. Appropriate data communication needs to be performed between the accessory and the camera body.

JP-A-2006-85423

According to the first aspect, the accessory can be attached to the camera body and can communicate with the camera body, and transmits a plurality of pieces of information on the driven member driven by the drive unit to the camera body. A first transmitter that is capable of receiving, and a receiver that receives from the camera body a first value indicating that a plurality of pieces of information relating to the driven member are transmitted to the camera body, the first transmission unit transmits a plurality of information on the previous SL driven member to the camera body.
According to a second aspect, the accessory can be attached to the camera body, said a camera body that can communicate accessory, transmits the information about the driven member driven by the driving unit to said camera body transmitting a first transmission unit it is possible to, the first value indicating that is sent to the camera body first information on a driven member by the first transmission unit to the camera body A second transmitter that receives from the camera body a second value indicating that second information about the driven member is transmitted to the camera body by the first transmitter ; The first transmission unit transmits the second information to the camera body when the first value and the second value are different.
According to a third aspect, the accessory can be attached to the camera body, said a camera body that can communicate accessory, transmits the information about the driven member driven by the driving unit to said camera body transmitting a first transmission unit it is possible to, the first value indicating that is sent to the camera body first information on a driven member by the first transmission unit to the camera body A second transmitter that receives from the camera body a second value indicating that second information about the driven member is transmitted to the camera body by the first transmitter ; The first transmission unit transmits the first information or the second information to the camera body when the first value and the second value are the same.

It is a figure which shows the structural example of the camera which concerns on 1st Embodiment. It is a figure for demonstrating the command data communication in the camera which concerns on 1st Embodiment. It is a figure which shows typically the electrical connection of the lens side connection part which concerns on 1st Embodiment, and a body side connection part. It is a figure which shows typically the mount of the camera body seen from the interchangeable lens side which concerns on 1st Embodiment. It is a figure which shows typically the mount of the interchangeable lens seen from the camera body side which concerns on 1st Embodiment. It is a figure for demonstrating the example of the generation which concerns on 1st Embodiment. It is a figure which shows an example of the generation determined in the camera which concerns on 1st Embodiment. It is a figure which shows an example of the generation determined in the camera which concerns on 1st Embodiment. It is a figure which shows an example of the process and communication in the camera which concern on 1st Embodiment. It is a figure for demonstrating an example of the calculation method of time (DELTA) t in the camera which concerns on 1st Embodiment.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration example of a camera 1 that is an example of an imaging apparatus according to the first embodiment. The camera 1 includes a camera body 2 and an interchangeable lens 3 that is an attachable accessory. As described above, the camera 1 is composed of the camera body 2 and the interchangeable lens 3 and may be referred to as a camera system.

  The camera body 2 is provided with a body side mount portion 201 to which the interchangeable lens 3 is attached. The interchangeable lens 3 is provided with a lens side mount portion 301 that is attached to the camera body 2. The lens side mount portion 301 and the body side mount portion 201 are provided with a lens side connection portion 302 and a body side connection portion 202, respectively. The lens side connection portion 302 and the body side connection portion 202 are provided with a plurality of terminals such as a clock signal terminal, a data signal terminal, and a power supply terminal, which will be described later. The interchangeable lens 3 is detachably attached to the body side mount portion 201 of the camera body 2 by the lens side mount portion 301.

  When the interchangeable lens 3 is attached to the camera body 2, the terminal provided in the body side connection portion 202 and the terminal provided in the lens side connection portion 302 are electrically connected. Thereby, power supply from the camera body 2 to the interchangeable lens 3 and communication between the camera body 2 and the interchangeable lens 3 are possible.

  First, the configuration of the interchangeable lens 3 will be described in detail. The interchangeable lens 3 includes a photographing optical system 31, an aperture stop 32, a lens driving unit 33, a lens position detection unit 34, a diaphragm driving unit 35, a lens memory 36, and a lens control unit 37. Although the photographic optical system 31 is illustrated as a single lens for the sake of simplicity of illustration, the photographic optical system 31 includes a plurality of lenses including a focus lens (focus adjustment lens). A subject image is formed on the image pickup surface 21. For example, in addition to the focus lens (focus adjustment lens), the photographic optical system 31 may include a zoom lens that changes the focal length and an anti-vibration lens (blur correction lens) that reduces image blur (camera shake). In practice, the aperture stop 32 is provided between a plurality of lenses of the photographing optical system 31, for example.

Each of the lens driving unit 33 and the aperture driving unit 35 is configured by, for example, a stepping motor, an ultrasonic motor, a DC motor, or the like. The lens driving unit 33 controls driving of the photographing optical system 31. For example, the lens driving unit 33 moves the focus lens forward and backward in the direction of the optical axis L based on a signal output from the lens control unit 37 to change the imaging position of the subject image by the photographing optical system 31. Further, the aperture driving unit 35 drives the aperture stop 32 based on a signal output from the lens control unit 37 to change the aperture diameter. In the case where the photographic optical system 31 includes a zoom lens and an anti-vibration lens, the lens driving unit 33 may include these drive sources and drive the zoom lens and the anti-vibration lens, respectively. In this case, the lens driving unit 33 moves the zoom lens in the optical axis L direction based on a signal output from the lens control unit 37. Further, the lens driving unit 33 moves the image stabilizing lens in a direction intersecting the optical axis L based on a signal output from the lens control unit 37.
The lens driving unit 33 and the aperture driving unit 35 may include a driving circuit (a driving IC or the like) (not shown) that drives a stepping motor, an ultrasonic motor, a DC motor, or the like.

  The lens position detection unit 34 includes, for example, a photo interrupter and an encoder. The photo interrupter detects that a detected portion (for example, a support portion of a focus lens) of the photographing optical system 31 has passed a reference position (origin position) on the optical axis L, and outputs the detected signal to the lens control unit 37. To do. The lens control unit 37 detects that the focus lens has passed the reference position (origin position) based on a signal from the photo interrupter. A so-called linear encoder is used as the encoder. The linear encoder generates two or more pulse signals having different phases, and detects the moving amount and moving direction of the focus lens based on the two or more pulse signals. The detected movement amount is output to the lens control unit 37 as a pulse signal. Or you may make it output a pulse signal according to an absolute position using a magnetic encoder etc. as an encoder.

  When a stepping motor is used as the lens driving unit 33, the encoder may not be used, and it may only be detected that the origin position has been passed by a photo interrupter. In that case, when the detected portion of the photographic optical system 31 (for example, the support portion of the focus lens) passes through the photo interrupter of the lens position detector 34, the photographic optical system 31 passes the origin position to the lens controller 37. A signal indicating that is output. In order to drive the photographic optical system 31, a pulse signal corresponding to the amount by which the lens is moved from the lens control unit 37 to the stepping motor drive circuit of the lens drive unit 33 is output, and from the drive circuit of the lens drive unit 33. A pulse signal corresponding to the amount of lens movement (corresponding to the pulse signal output from the lens control unit 37 to the drive circuit of the lens drive unit 33) is output to the lens control unit 37.

  When the photographic optical system 31 includes a zoom lens or an anti-vibration lens, the lens position detection unit 34 detects the amount of movement of the zoom lens or the amount of movement of the anti-vibration lens, and moves the amount of zoom lens. Alternatively, a signal representing the focal length and a signal representing the movement amount or movement position of the image stabilizing lens are generated.

  The lens control unit 37 includes a processor such as a CPU and FPGA, and a memory such as a ROM and a RAM, and controls each unit of the interchangeable lens 3 based on a control program. The lens control unit 37 uses the lens driving unit 33 and the aperture driving unit 35 based on control signals input from the body control unit 27 of the camera body 2 via the body side connection unit 202 and the lens side connection unit 302. The photographic optical system 31 and the aperture stop 32 are driven and controlled. For example, when a control signal indicating the moving direction, moving amount, moving speed, or the like of the focus lens is input from the body control unit 27, the lens control unit 37 issues an instruction to drive and control the lens driving unit 33 based on the control signal. send.

The lens control unit 37 detects the position of the focus lens, the zoom lens, etc., and transmits it to the camera body 2. When a stepping motor is used as the lens driving unit 33, the lens control unit 37 transmits the driving amount of the focus lens to the lens driving unit 33. A driving circuit (not shown) of the lens driving unit 33 drives a stepping motor. When the stepping motor is driven, a pulse signal corresponding to the driving amount is output from the driving circuit of the lens driving unit 33 to the lens control unit 37.
The lens control unit 37 detects from the output of the photo interrupter of the lens position detection unit 34 that the focus lens or the zoom lens has passed the reference position (origin position), and further drives a pulse signal input from the encoder or a stepping motor. Information corresponding to the amount of movement of the focus lens (pulse position information) is generated by counting and integrating the pulse signals according to the amount.
The generated information (pulse position information) corresponding to the movement amount of the focus lens is transmitted to the camera body 2 by hotline communication described later.

  The lens memory 36 is configured by, for example, a nonvolatile storage medium. The lens memory 36 stores various information related to the interchangeable lens 3. For example, the lens memory 36 stores information indicating the focal length of the interchangeable lens, the open aperture value, and the like, and communication specifications that the interchangeable lens 3 can handle when communicating with the camera body 2. The information indicating the communication specification is referred to as a later-described interchangeable lens generation. The generation may be referred to as generation information. The generation information of the interchangeable lens 3 is referred to as lens side generation information. Writing of data to the lens memory 36 and reading of data from the lens memory 36 are controlled by the lens control unit 37. The lens side generation information may be stored in a memory inside the lens control unit 37.

  The lens control unit 37 includes a first lens communication unit 38 and a second lens communication unit 39. Although described in detail later, the first lens communication unit 38 performs command data communication with the first body communication unit 28 via the lens side connection unit 302 and the body side connection unit 202. The second lens communication unit 39 performs hot line communication with the second body communication unit 29 via the lens side connection unit 302 and the body side connection unit 202.

  Next, the configuration of the camera body 2 will be described in detail. The camera body 2 includes an image sensor 21, a body memory 22, a display unit 23, an operation unit 24, a power supply unit 26, and a body control unit 27. The body control unit 27 includes a processor such as a CPU or FPGA, and a memory such as a ROM or RAM, and controls each unit of the camera 1 based on a control program.

  The body control unit 27 performs predetermined image processing on the signal output from the image sensor 21 to generate image data. The image processing includes, for example, known image processing such as gradation conversion processing, color interpolation processing, and contour enhancement processing. The body control unit 27 also generates a control signal for controlling the driving of the photographing optical system 31 (the driving of the focus lens, the driving of the zoom lens, and the driving of the anti-vibration lens) and the driving of the aperture stop 32.

  The body control unit 27 performs processing necessary for automatic focus adjustment (AF) of the photographing optical system 31. Specifically, the body control unit 27 performs a phase difference detection type focus detection process. The imaging element 21 has a focus detection pixel that is arranged by replacing a part of the imaging pixel that outputs the imaging signal and shields a part of the photoelectric conversion unit in the pixel with a light shielding film. The body control unit 27 calculates the defocus amount by the phase difference detection method using the focus detection signal output from the focus detection pixel. The body control unit 27 outputs a signal related to the calculated defocus amount to the lens control unit 37. The lens control unit 37 drives the focus lens according to the defocus amount. Note that the imaging element 21 may have a configuration including a plurality of photoelectric conversion units in one pixel and an imaging and focus detection pixel that outputs an imaging signal and a focus detection signal.

  The body control unit 27 can also perform a contrast detection type focus detection process instead of or in addition to the phase difference detection type focus detection process. That is, the body control unit 27 sequentially calculates the contrast evaluation value of the subject image based on the signal from the image sensor 21 while moving the focus lens of the photographing optical system 31 in the direction of the optical axis L. The body control unit 27 uses the focus lens position information (pulse position information) transmitted from the interchangeable lens 3 to associate the focus lens position with the contrast evaluation value. Then, the body control unit 27 calculates the focus position of the focus lens. The body control unit 27 outputs a signal corresponding to the calculated in-focus position to the lens control unit 37. The lens control unit 37 moves the focus lens to the focus position.

  The power supply unit 26 has a power source and supplies power to the camera body 2 and the interchangeable lens 3. The power feeding unit 26 is connected to the body side connecting unit 202 and the body control unit 27. Further, the power supply unit 26 supplies power to the lens control unit 37 via the body side connection unit 202 and the lens side connection unit 302.

  The image sensor 21 is, for example, a CMOS image sensor or a CCD image sensor. The image sensor 21 receives the light beam that has passed through the photographing optical system 31 and captures a subject image. In the imaging element 21, a plurality of pixels having photoelectric conversion units are arranged in a two-dimensional plane in the row direction and the column direction. The photoelectric conversion unit is configured by, for example, a photodiode (PD). The image sensor 21 photoelectrically converts the received light to generate a signal, and outputs the generated signal to the body control unit 27.

  The body memory 22 is configured by, for example, a nonvolatile storage medium. The body memory 22 stores a program for controlling the camera body 2 and the camera 1. The body memory 22 stores information indicating the generation of the camera body described later, that is, information indicating communication specifications that the camera body 2 can handle when communicating with the interchangeable lens 3. The information indicating the communication specification is referred to as a camera body generation described later. The generation may be referred to as generation information. The generation information of the camera body 2 is referred to as body side generation information. Writing of data to the body memory 22 and reading of data from the body memory 22 are controlled by the body control unit 27. Note that the image data may be stored in the body memory 22 or may be stored in another storage medium. The body side generation information may be stored in a memory inside the body control unit 27.

  The display unit 23 displays an image based on the image data, information related to photographing such as a shutter speed and an aperture value, a menu screen, and the like. The operation unit 24 includes various setting switches such as a release button and a power switch, and outputs an operation signal corresponding to each operation to the body control unit 27.

  The body control unit 27 includes a first body communication unit 28 and a second body communication unit 29. As will be described later, the first body communication unit 28 performs command data communication with the first lens communication unit 38 via the body side connection unit 202 and the lens side connection unit 302. The second body communication unit 29 performs hot line communication with the second lens communication unit 39 via the body side connection unit 202 and the lens side connection unit 302.

  Next, command data communication will be described. The first lens communication unit 38 and the first body communication unit 28 perform full-duplex communication via respective terminals of the lens side connection unit 302 and the body side connection unit 202. As will be described later with reference to FIG. 2, the first lens communication unit 38 and the first body communication unit 28 exchange four types of signals, for example, an RDY signal, a CLK signal, a DATAB signal, and a DATA signal.

  The RDY signal is a signal indicating whether or not the first lens communication unit 38 can communicate, and the first lens communication unit 38 switches between a high level (H level) and a low level (L level). The RDY signal is a signal transmitted (output) to the first body communication unit 28. The CLK signal is a camera body side clock signal transmitted from the first body communication unit 28 to the first lens communication unit 38. The DATAB signal is a data signal transmitted from the first body communication unit 28 to the first lens communication unit 38. The DATA signal is a data signal transmitted from the first lens communication unit 38 to the first body communication unit 28.

  Next, information (command and data) transmitted and received by command data communication will be described. From the interchangeable lens 3 to the camera body 2, for example, data relating to optical characteristics (open F value, aberration, etc.) of the photographing optical system 31, data relating to the infinity position and close position of the focus lens, and lens side generation Information and response contents (response data) such as the execution status of initialization in response to an initialization command from the camera body 2 to be described later are transmitted. On the other hand, from the camera body 2 to the interchangeable lens 3, for example, generation information indicating communication specifications used for hotline communication, which will be described later, and driving of a focus lens, an anti-vibration lens, and a zoom lens of the photographing optical system 31 are performed by a DATAB signal. In addition, a control command (command) and control content (control data) for instructing driving of the aperture stop 32, initialization of the lens, and the like are transmitted.

  FIG. 2 is a diagram for explaining command data communication in the imaging apparatus according to the first embodiment. FIG. 2 schematically illustrates an example of a timing chart of command data communication between the first lens communication unit 38 and the first body communication unit 28 between the lens control unit 37 and the body control unit 27. The first lens communication unit 38 transmits / receives a signal to / from the first body communication unit 28 using an RDY signal, a CLK signal, a DATAB signal, and a DATA signal.

  The signal level of the RDY signal indicates whether or not the first lens communication unit 38 can communicate. When the first lens communication unit 38 is communicable with the first body communication unit 28, the lens control unit 37 sets the signal level of the RDY signal to a low level (L level, for example, ground voltage, reference voltage). When the first lens communication unit 38 cannot communicate with the first body communication unit 28, the lens control unit 37 sets the signal level of the RDY signal to a high level (H level, for example, a power supply voltage). The first body communication unit 28 detects the signal level of the RDY signal, and the body control unit 27 determines whether or not the first lens communication unit 38 is in a communicable state.

  At time t1 when the RDY signal is at a low level (L level), the first body communication unit 28 outputs (transmits) a clock signal (CLK signal) to the first lens communication unit 38. That is, the first body communication unit 28 sets the signal level of the CLK signal, which is a predetermined voltage (for example, high level, power supply voltage) until time t1, to the high level and the low level (for example, ground voltage, reference voltage) after time t1. Are alternately switched at a predetermined cycle. In the period from time t1 to time t2, the first body communication unit 28 transmits the command packet 41 using the DATAB signal in synchronization with the rising or falling edge of the CLK signal.

  Note that when the RDY signal is at a high level (H level), the first lens communication unit 38 does not accept communication, and in this state, the first body communication unit 28 is connected to the first lens communication unit 38. Does not send commands and data. In this case, the first body communication unit 28 fixes the signal levels of the CLK signal and the DATAB signal to predetermined voltages (for example, high level).

  The lens control unit 37 confirms the content of the command packet 41 input from the first body communication unit 28 by a checksum or the like, and determines whether the command packet 41 has been normally received. If the first lens communication unit 38 has successfully received the command packet 41, the lens control unit 37 sets the RDY signal to high level at time t3. Further, the lens control unit 37 performs a first process 51 according to the contents of the command packet 41. When the first process 51 is completed, the lens control unit 37 sets the RDY signal to a low level at time t4. If the first lens communication unit 38 cannot normally receive the command packet 41, the lens control unit 37 keeps the RDY signal at a low level, indicating that the command packet 41 cannot be normally received. The body communication unit 28 is notified.

  When detecting that the RDY signal has changed from the high level to the low level, the first body communication unit 28 starts outputting the CLK signal again at time t5. In the period from time t5 to time t6, the first body communication unit 28 transmits the data packet 42 by the DATAB signal in synchronization with the rising or falling edge of the CLK signal. Further, during the same period from time t5 to time t6, the first lens communication unit 38 synchronizes the rising or falling of the CLK signal input from the first body communication unit 28, and the data packet 43 is transmitted by the DATA signal. Send.

  When the first lens communication unit 38 normally receives the data packet 42 from the first body communication unit 28, the lens control unit 37 sets the RDY signal to high level at time t7. The lens control unit 37 performs a second process 52 according to the content of the data packet 42. When the second process 52 is completed, the lens control unit 37 sets the RDY signal to a low level at time t8.

  The contents indicated by the command packet 41 and the data packet 42 output from the first body communication unit 28 described above include, for example, a request for initialization of the interchangeable lens 3, a request for specific data, and a driven member of the imaging optical system 31. For example, an instruction to drive (for example, a focus lens, an aperture stop, etc.), an instruction to start hot line communication by the second lens communication unit 39, and the like. The lens control unit 37 performs, as the first process 51 or the second process 52, a process for generating requested specific data, a process for driving a driven member, or the like. The lens control unit 37 transmits, as the data packet 43, for example, flag data indicating completion of initialization of the interchangeable lens 3, data indicating optical characteristics, data indicating that driving of the designated driven member is completed, and the like.

  Next, hotline communication will be described in detail. The second lens communication unit 39 and the second body communication unit 29 shown in FIG. 1 perform unidirectional communication from the interchangeable lens 3 to the camera body 2 via the terminals of the lens side connection unit 302 and the body side connection unit 202, respectively. I do. The second lens communication unit 39 transmits, for example, two types of signals, an HCLK signal and an HDATA signal, to the second body communication unit 29.

  The HCLK signal is an interchangeable lens side clock signal transmitted from the second lens communication unit 39 to the second body communication unit 29. The HDATA signal is a data signal transmitted from the second lens communication unit 39 to the second body communication unit 29, and includes information on the lens positions of the focus lens, the zoom lens, and the anti-vibration lens described above, and the aperture stop 32. It is the information regarding the opening diameter of. The second lens communication unit 39 transmits the HDATA signal to the second body communication unit 29 in synchronization with the periodic rise or fall of the HCLK signal. As described above, the second lens communication unit 39 and the second body communication unit 29 perform unidirectional communication in which the clock signal and the data signal are transmitted from the second lens communication unit 39 to the second body communication unit 29.

  Note that the cycle of the CLK signal used for command data communication is the same as or shorter than the cycle of the HCLK signal used for hotline communication. The frequency of the CLK signal output from the camera body 2 to the interchangeable lens 3 is, for example, 8 MHz, and the frequency of the HCLK signal output from the interchangeable lens 3 to the camera body 2 is, for example, 2.5 MHz to 8 MHz.

  Next, the electrical connection between the lens side connection portion 302 and the body side connection portion 202 will be described. FIG. 3 is a diagram schematically showing electrical connection between the lens side connection portion 302 and the body side connection portion 202. The body side connection unit 202 includes an LDET (B) terminal, a VBAT (B) terminal, a PGND (B) terminal, a V33 (B) terminal, a GND (B) terminal, an RDY (B) terminal, a DATAB (B) terminal, a CLK (B) terminal, DATAL (B) terminal, HCLK (B) terminal, and HDATA (B) terminal. These 11 body-side terminals are collectively referred to as a body-side terminal group.

The LDET (B) terminal is a terminal used for detection of attachment / detachment of the interchangeable lens 3. The LDET (B) terminal is connected to the body control unit 27 via the resistor R2. A power supply V33 supplied from the power supply unit 26 is connected between the resistor R2 and the body control unit 27 via the resistor R1, and the LDET (B) terminal is pulled up.
The VBAT (B) terminal, the PGND (B) terminal, the V33 (B) terminal, and the GND (B) terminal are power supply system terminals on the camera body side that are connected to the power supply unit 26. In FIG. 3, the direction of the supplied power is indicated by an arrow. The VBAT (B) terminal is a terminal used for power supply (supply voltage supply) to the drive system of the interchangeable lens 3. The lens drive unit 33 of the interchangeable lens 3 is driven by the power supplied via the VBAT (B) terminal. The voltage applied to the VBAT (B) terminal by the power feeding unit 26 is about 10 V at the maximum. The PGND (B) terminal is a ground terminal corresponding to the VBAT (B) terminal, and becomes a ground potential (ground) with respect to the power supply voltage of the driving system supplied from the VBAT (B) terminal.

  The V33 (B) terminal is a terminal used for power supply (power supply voltage supply) to the circuit system of the interchangeable lens 3. The lens control unit 37 and the like are operated by power supplied from the power supply unit 26 via the V33 (B) terminal. Each unit such as the lens control unit 37 operates with a smaller voltage and a smaller current than the lens driving unit 33. The voltage applied to the V33 (B) terminal by the power feeding unit 26 is about 3.3 V at the maximum. The GND (B) terminal is a ground terminal corresponding to the V33 (B) terminal, and becomes a ground potential (ground) of the power supply voltage to the circuit system supplied by the V33 (B) terminal.

  The RDY (B) terminal, DATAB (B) terminal, CLK (B) terminal, DATAL (B) terminal, HCLK (B) terminal, and HDATA (B) terminal are communication terminals connected to the body control unit 27. Yes, RDY (L) terminal, DATAB (L) terminal, CLK (L) terminal, DATAL (L) terminal, HCLK (L) terminal, HDATA (L) terminal (described later) RDY signal, CLK Signals, DATAB signals, DATAL signals, HCLK signals, and HDATA signals are transmitted and received. The RDY (B) terminal, DATAB (B) terminal, CLK (B) terminal, and DATAL (B) terminal are connected to the first body communication unit 28 of the body control unit 27 and are used for command data communication as described above. . In addition, the HCLK (B) terminal and the HDATA (B) terminal are connected to the second body communication unit 29 and used for hot line communication as described above. In FIG. 3, the signal flow is indicated by arrows. The potential of the RDY (B) terminal indicates whether the interchangeable lens 3 can perform command data communication. The DATAB (B) terminal is a terminal from which a signal is output toward the interchangeable lens 3. The CLK (B) terminal is a terminal from which a clock signal on the camera body side is output toward the interchangeable lens 3.

The DATAL (B) terminal is a terminal to which a data signal from the interchangeable lens 3 is input.
The HCLK (B) terminal is a terminal to which the interchangeable lens side clock signal from the interchangeable lens 3 is input. The HDATA (B) terminal is a terminal to which a data signal from the interchangeable lens 3 is input.

  The lens side connection section 302 includes an LDET (L) terminal, a VBAT (L) terminal, a PGND (L) terminal, a V33 (L) terminal, a GND (L) terminal, an RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, DATAL (L) terminal, HCLK (L) terminal, and HDATA (L) terminal. These 11 lens side terminals are collectively referred to as a lens side terminal group.

  When the interchangeable lens 3 is attached to the camera body 2, the body side terminal and the lens side terminal are electrically connected as shown by a broken line in FIG. Specifically, the LDET (B) terminal is connected to the LDET (L) terminal, the VBAT (B) terminal is connected to the VBAT (L) terminal, and the PGND (B) terminal is connected to the PGND (L) terminal. The V33 (L) terminal is connected to the V33 (B) terminal, the GND (L) terminal is connected to the GND (B) terminal, and the RDY (L) terminal is connected to the RDY (B) terminal. , DATAB (B) terminal is connected to DATAB (L) terminal, CLK (B) terminal is connected to CLK (L) terminal, DATAL (B) terminal is connected to DATAL (L) terminal, HCLK The HCLK (L) terminal is connected to the (B) terminal, and the HDATA (L) terminal is connected to the HDATA (B) terminal. The role of each lens-side terminal corresponds to the role of the body-side terminal that contacts each other.

  The LDET (L) terminal is grounded via a resistor R3. When the LDET (L) terminal contacts the LDET (B) terminal, the potential of the LDET (B) terminal is pulled down. The VBAT (L) terminal and the PGND (L) terminal are connected to the lens driving unit 33 and the aperture driving unit 35 via the lens control unit 37. A so-called bypass capacitor C1 is connected between the VBAT (L) terminal and the PGND (L) terminal. The V33 (L) terminal and the GND (L) terminal are connected to the lens control unit 37. A bypass capacitor C2 is connected between the V33 (L) terminal and the GND (L) terminal. The RDY (L) terminal, DATAB (L) terminal, CLK (L) terminal, DATAL (L) terminal, HCLK (L) terminal, and HDATA (L) terminal are each connected to the lens control unit 37. The RDY (L) terminal, DATAB (L) terminal, CLK (L) terminal, and DATAL (L) terminal are connected to the first lens communication unit 38 of the lens control unit 37 and used for command data communication as described above. . In addition, the HCLK (L) terminal and the HDATA (L) terminal are connected to the second lens communication unit 39 and used for hot line communication as described above.

  After transmitting a control command (command) from the body control unit 27 to the lens control unit 37 of the interchangeable lens 3, the control content (control data) from the body control unit 27 and the response content (response data) from the lens control unit 37. Communication in which data is transmitted and received in parallel is called command data communication. Command data communication is full-duplex communication. The command data communication is performed via the first body communication unit 28 and the first lens communication unit 38, the RDY (B) terminal, the RDY (L) terminal, the DATAB (B) terminal, the DATAB (L) terminal, and the CLK (B) terminal. , CLK (L) terminal, DATAL (B) terminal, and DATAL (L) terminal are used for digital data communication.

  The body control unit 27 transmits various control commands and control contents to the interchangeable lens 3 by command data communication via the first body communication unit 28 and the first lens communication unit 38, and receives response contents from the interchangeable lens 3. By doing so, various information is transmitted to and received from the interchangeable lens 3. The control command here is, for example, a lens information transmission command. The various information received from the interchangeable lens 3 includes, for example, model information of the interchangeable lens 3 and information indicating optical characteristics such as a focal length of the imaging optical system 31. The various information transmitted to the interchangeable lens 3 includes, for example, control contents such as a lens driving amount and model information of the camera body 2. The control command includes a focus lens drive command (not shown). The lens control unit 37 receives various control commands from the body control unit 27, receives various information from the body control unit 27, and transmits various information to the body control unit 27 by command data communication. To do.

  FIG. 4A is a diagram schematically showing the mount of the camera body 2 viewed from the interchangeable lens 3 side. The body side mount part 201 has an annular reference surface having a certain width. Furthermore, the body side mount part 201 has a body side first claw part 129a, a body side second claw part 129b, a body side third claw part 129c, and a body side fourth claw part 129d. In the following description, these four claw portions are collectively referred to as a body side claw portion 129.

  The body-side claw portions 129 are arranged at intervals from each other along the circular opening of the body-side mount portion 201. As shown in FIG. 4 (a), the body side first claw portion 129a is in the upper right position, the body side second claw portion 129b is in the upper left position, and the body side third claw portion 129c is in the lower left position. The side fourth claw portions 129d are respectively arranged at the lower right position.

  The circumferential lengths of the body-side first claw portion 129a to the body-side fourth claw portion 129d are different from each other. Specifically, the body side first claw portion 129a is the longest, the body side third claw portion 129c is the second longest, the body side fourth claw portion 129d is the third longest, and the body side second claw portion 129b is Shortest.

  The body side claw portion 129 protrudes from the body side mount portion 201 toward the center of the opening. On the circumference of the opening, there are a portion where the body side claw portion 129 exists and a portion where the body side claw portion 129 does not exist. is there. In the following description, the space 140a between the body-side first claw portion 129a and the body-side fourth claw portion 129d on the circumference of the opening of the body-side mount portion 201 is referred to as a body-side first insertion / extraction portion 140a. Similarly, a space 140b between the body-side first claw portion 129a and the body-side second claw portion 129b is replaced with a body-side second insertion / extraction portion 140b, a body-side second claw portion 129b, and a body-side third claw portion 129c. The space 140c between the body side third insertion / extraction portion 140c and the space 140d between the body side third claw portion 129c and the body side fourth claw portion 129d are referred to as a body side fourth insertion / extraction portion 140d, respectively. These four body side insertion / extraction portions are collectively referred to as a body side insertion / extraction portion 140.

  A body side connection portion 202 is provided inside the opening of the body side mount portion 201. The body side connection portion 202 has an arc shape corresponding to the shape of the annular body side mount portion 201. The body-side connection portion 202 is preferably arranged at the upper portion of the opening of the body-side mount portion 201 in parallel with the opening of the body-side mount portion 201, and is arranged at the center of the upper portion as shown in FIG. . The body side connection part 202 has a plurality of body side terminals as described above. The plurality of body-side terminals are arranged in a circular arc in the body-side connection portion 202 in a line inside the body-side mount portion 201. As shown in FIG. 4A, the plurality of body-side terminals are connected to HDATA (B), HCLK (B), DATAL (B), CLK (B), DATAB (B), RDY (B), GND ( B), V33 (B), PGND (B), VBAT (B), and 11 terminals of LDET (B) are arranged on the leftmost side. Each of the body side terminal groups is a conductive pin. The body side terminal group is pushed toward the −Z direction (FIG. 1) by a spring or the like (not shown). In other words, the Z direction is a direction toward the interchangeable lens 3 attached to the camera body 2, and is a direction of the subject.

  The body side mount part 201 has a hole through which the lock pin 142 passes. The hole through which the lock pin 142 passes is disposed at the upper right of the body side fourth claw portion 129d. In other words, on the annular reference surface of the body side mount portion 201, the hole of the lock pin 142 is formed so that the region where the body side fourth claw portion 129d exists in the opening of the body side mount portion 201 and the body side first claw portion 129a. It is arranged between existing areas. The lock pin 142 is pushed toward the −Z direction (FIG. 1) by a spring (not shown) or the like.

  FIG. 4B is a schematic view of the mount of the camera body 2 from which the body side mount portion 201 is removed as viewed from the interchangeable lens 3 side. A first leaf spring 141a is provided at a position corresponding to the body side first claw portion 129a (the back side in the + Z direction of the body side first claw portion 129a). Similarly, a second leaf spring 141b is provided at a position corresponding to the body side second claw portion 129b (back side of the body side second claw portion 129b), and a position corresponding to the body side third claw portion 129c (body A third leaf spring 141c is provided on the back side of the side third claw portion 129c, and a fourth leaf spring is provided at a position corresponding to the body side fourth claw portion 129d (the back side of the body side fourth claw portion 129d). 141d is provided. In the following description, these four leaf springs are collectively referred to as a leaf spring 141. The leaf spring 141 presses a later-described lens side claw portion in the + Z direction (camera body 2 side).

  FIG. 5 is a diagram schematically showing the mount of the interchangeable lens 3 viewed from the camera body 2 side. The interchangeable lens 3 includes the lens side mount portion 301 and the lens side connection portion 302 described above with reference to FIG. The lens side mount portion 301 has an annular reference surface having a certain width. When the interchangeable lens 3 is mounted on the camera body 2, the annular reference surface of the lens side mount portion 301 comes into contact with the annular reference surface of the body side mount portion 201 described above. Further, the lens side mount portion 301 has a cylindrical portion extending in the optical axis direction on the inner periphery thereof. The lens side mount portion 301 includes a lens side first claw portion 139a, a lens side second claw portion 139b, a lens side third claw portion 139c, and a lens side fourth claw spaced apart from each other along the outer periphery of the cylindrical portion. Part 139d. In the following description, these four claw portions are collectively referred to as a lens side claw portion 139.

  The lens side claw portion 139 is provided in a direction protruding from the outer periphery of the cylindrical portion of the lens side mount portion 301 toward the mount outer side (radial direction from the optical axis L). As shown in FIG. 5, the lens side first claw 139a is in the upper left position, the lens side second claw 139b is in the upper right position, the lens side third claw 139c is in the lower right position, The four claw portions 139d are respectively arranged at the lower left position. On the rear side of the lens side claw portion 139 (the reference surface side of the lens side mount portion 301), there is a space for the corresponding body side claw portion 129 to enter when the interchangeable lens 3 is attached to the camera body 2. .

  A lens side connection portion 302 is provided inside the opening of the lens side mount portion 301. The lens side connection portion 302 has an arc shape corresponding to the shape of the annular lens side mount portion 301. The lens-side connecting portion 302 is preferably arranged at the upper portion of the opening of the lens-side mount portion 301 in parallel with the opening of the lens-side mount portion 301 and is arranged at the center of the upper portion as shown in FIG. The lens side connection part 302 has a plurality of lens side terminals as described above. The plurality of lens side terminals are arranged in an arc shape in the lens side connection portion 302 in a line inside the lens side mount portion 301. As shown in FIG. 5, the plurality of lens side terminals are provided with LDET (L), VBAT (L), PGND (L), V33 (L), GND (L), RDY (L), DATAB (L), Eleven terminals of CLK (L), DATAL (L), HCLK (L), and HDATA (L) are arranged. The lens side terminal groups are arranged such that the conductive contact surfaces are exposed in the + Z direction (FIG. 1). In other words, the + Z direction is a direction in which subject light that has passed through the photographing optical system 31 travels toward the image sensor 21.

  The lens side mount part 301 has a lock pin receiving part 143. The lock pin receiving part 143 is arrange | positioned at the upper left of the lens side 4th nail | claw part 139d, as shown in FIG. That is, the lock pin receiving portion 143 is disposed between the portion corresponding to the lens side first claw portion 139a and the portion corresponding to the lens side fourth claw portion 139d of the lens side mount portion 301. The lock pin receiving portion 143 is a groove in which the lock pin 142 is received when the interchangeable lens 3 is attached to the camera body 2. This groove is provided in the −Z direction (FIG. 1) from the reference surface of the lens side mount portion 301.

  When the interchangeable lens 3 is attached to the camera body 2, the plurality of body side terminals are in physical contact with the corresponding plurality of lens side terminals. By this contact, the plurality of body side terminals and the plurality of lens side terminals are electrically connected. That is, the plurality of body side terminals and the plurality of lens side terminals are electrically connected.

(Mounting interchangeable lenses)
A method for attaching the interchangeable lens 3 to the camera body 2 will be described. When attaching the interchangeable lens 3 to the camera body 2, first, the body side mount part 201 and the lens side mount part 301 are made to face each other, the lens side first claw part 139a is aligned with the position of the body side first insertion / extraction part 140a, and the lens side The second claw portion 139b is aligned with the position of the body side second insertion / extraction portion 140b, the lens side third claw portion 139c is aligned with the position of the body side third insertion / extraction portion 140c, and the lens side fourth claw portion 139d is aligned with the body side fourth. Align with the position of the insertion / extraction part 140d. Then, the lens side first claw portion 139a is inserted into the body side first insertion / extraction portion 140a, the lens side second claw portion 139b is inserted into the body side second insertion / extraction portion 140b, and the lens side third claw portion 139c is inserted into the body side. The lens side fourth claw 139d is inserted into the third insertion / extraction part 140c, and the lens side fourth insertion / extraction part 140d is inserted. At this time, the LDET (L) terminal is the CLK (B) terminal, the VBAT (L) terminal is the DATAL (B) terminal, the PGND (L) terminal is the HCLK (B) terminal, and the V33 (L) terminal is the HDATA (B B) Contact each terminal.

  From this state, the interchangeable lens 3 is rotated in the mounting direction 144 shown in FIGS. That is, the body side first claw portion 129a enters the space on the back side of the lens side first claw portion 139a, and the body side second claw portion 129b enters the space on the back side of the lens side second claw portion 139b. The third claw portion 129c enters the space behind the lens side third claw portion 139c, and the body side fourth claw portion 129d enters the space behind the lens side fourth claw portion 139d. At this time, the plurality of lens side terminals sequentially come into contact with the plurality of body side terminals. Note that instead of the interchangeable lens 3, the camera body 2 may be rotated in a direction opposite to the mounting direction 144 shown in FIGS. 4A and 5.

  When the lens side claw portions 139 are inserted into the corresponding body side insertion / extraction portions 140 and rotated in the mounting direction 144, for example, the LDET (L) terminal is the CLK (B) terminal, the DATAB (B) terminal, and the RDY (B). The terminal, the GND (B) terminal, the V33 (B) terminal, the PGND (B) terminal, the VBAT (B) terminal, and the LDET (B) terminal are sequentially contacted. For example, the VBAT (L) terminal includes a DATAL (B) terminal, a CLK (B) terminal, a DATAB (B) terminal, an RDY (B) terminal, a GND (B) terminal, a V33 (B) terminal, a PGND (B) terminal, The VBAT (B) terminal is contacted in order. For example, PGND (L) terminal is HCLK (B) terminal, DATAL (B) terminal, CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B) terminal, PGND (B) Contact the terminals in order. For example, the V33 (L) terminal is HDATA (B) terminal, HCLK (B) terminal, DATAL (B) terminal, CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B) Contact the terminals in order. For example, the GND (L) terminal is in order of the HDATA (B) terminal, the HCLK (B) terminal, the DATA (B) terminal, the CLK (B) terminal, the DATA B (B) terminal, the RDY (B) terminal, and the GND (B) terminal. Contact.

  For example, the RDY (L) terminal contacts the HDATA (B) terminal, the HCLK (B) terminal, the DATAL (B) terminal, the CLK (B) terminal, the DATAB (B) terminal, and the RDY (B) terminal in this order. For example, the DATAB (L) terminal contacts the HDATA (B) terminal, the HCLK (B) terminal, the DATAL (B) terminal, the CLK (B) terminal, and the DATAB (B) terminal in this order. For example, the CLK (L) terminal contacts the HDATA (B) terminal, the HCLK (B) terminal, the DATAL (B) terminal, and the CLK (B) terminal in this order. For example, the DATAL (L) terminal contacts the HDATA (B) terminal, the HCLK (B) terminal, and the DATAL (B) terminal in this order. For example, the HCLK (L) terminal contacts the HDATA (B) terminal and the HCLK (B) terminal in this order.

  When the interchangeable lens 3 is rotated by a predetermined angle with respect to the camera body 2, the mounting completion position is reached. At the mounting completion position, the corresponding body side claw portion 129 and lens side claw portion 139 face each other in the optical axis direction, and the lock pin 142 is pushed in the −Z direction of FIG. When the lock pin 142 enters the lock pin receiving portion 143, the interchangeable lens 3 cannot be rotated for removal from the camera body 2. That is, when the body side claw portion 129 and the lens side claw portion 139 reach a predetermined mounting completion position, the relative positions of the body side mount portion 201 and the lens side mount portion 301 are fixed. The lens side claw portion 139 is pushed to the body side (+ Z direction in FIG. 1) by the leaf spring 141. Thereby, each of the plurality of lens side terminals is in contact with and electrically connected to each of the corresponding plurality of body side terminals.

  In the following description, a state in which the body side claw portion 129 and the lens side claw portion 139 have reached a predetermined mounting completion position is referred to as a mounting completion state. A state in which the lens side claw portion 139 is rotating from the position where the lens side claw portion 139 is inserted into the body side inserting / extracting portion 140 to a position immediately before the mounting completion position, or a state where the lens side claw portion 139 is rotating from immediately before the mounting completion position to the insertion position Call the state.

  In the mounting state, the signal level of the LDET (B) terminal is pulled up and is at a high level. The body control unit 27 determines that the interchangeable lens 3 is not attached when it is detected that the signal level of the LDET (B) terminal is high. The body control unit 27 does not cause the power supply unit 26 to supply power to the VBAT (B) terminal and the V33 (B) terminal when the interchangeable lens 3 is not attached.

  When the mounting is completed, the signal level of the LDET (B) terminal is pulled down to a low level as described above (FIG. 3). When the body control unit 27 detects that the signal level of the LDET (B) terminal has become a low level, the body control unit 27 determines that the interchangeable lens 3 is attached. Further, in the mounting completion state, the lock pin 142 enters the lock pin receiving portion 143, and a lock pin detection switch (not shown) interlocked with the lock pin 142 is turned on. When the body control unit 27 detects that the signal level of the LDET (B) terminal has become low level and the lock pin detection switch is turned on, the body control unit 27 starts supplying power to the power supply unit 26 to the V33 (B) terminal. That is, the power supply voltage of the circuit system is supplied. The camera body 2 does not necessarily include the lock pin detection switch. If the lock pin detection switch is not provided, the power supply unit 26 can start supplying power to the V33 (B) terminal when it detects that the signal level of the LDET (B) terminal has become low. Good.

  When power supply to the V33 (B) terminal is started, a power supply voltage is supplied to the lens control unit 37 of the interchangeable lens 3 through the V33 (L) terminal, and the lens control unit 37 starts operating. The lens control unit 37 that has started the operation permits initial communication with the body control unit 27 by command data communication. After the lens control unit 37 permits the initial communication, the body control unit 27 starts the initial communication. The initial communication includes a signal for requesting power supply to the VBAT (L) terminal by the lens control unit 37. When a signal requesting power supply to the VBAT (L) terminal is transmitted from the lens control unit 37 to the body control unit 27, the body control unit 27 supplies a power supply voltage to the VBAT (B) terminal, and the camera body 2 And an interchangeable lens 3 are initialized. In the initialization process, information necessary for various operations of the camera 1 such as the photographing operation and the focus adjustment operation is exchanged between the camera body 2 and the interchangeable lens 3, or the lens position of the interchangeable lens is moved to the reference position. Or

  When the user presses a lock release button (not shown) of the camera body 2 in the mounting completion state, the lock pin 142 is retracted from the lock pin receiving portion 143. Thereby, the relative position of the body side mount part 201 and the lens side mount part 301 can be changed. When the user presses a lock release button (not shown), the body control unit 27 turns off the lock pin detection switch linked to the lock release button, and supplies power to the power supply unit 26 to the VBAT (B) terminal and the V33 (B) terminal. Stop. In this state, when the interchangeable lens 3 is rotated in the direction opposite to the mounting direction 144 shown in FIGS. 4A and 5, the plurality of lens side terminals are the plurality of body side terminals in the reverse order. Will come in contact with.

  The power supply need not be stopped in conjunction with the operation of the unlock button. In this case, the body control unit 27 causes the LDET (L) terminal and the LDET (B) terminal to be separated by rotation in the direction opposite to the mounting direction 144 of the interchangeable lens 3, and the signal level of the LDET (B) terminal changes from low level to high level. When it is detected that the level has changed, the power supply unit 26 stops supplying power to the VBAT (B) terminal and the V33 (B) terminal. By doing in this way, the number of parts of the camera 1 can be reduced. Further, when it is detected that both the lock release button is pressed and the signal level of the LDET (B) terminal has changed from the low level to the high level, the power supply unit 26 is connected to the VBAT (B) terminal and the V33 (B). The power supply to the terminal may be stopped. Alternatively, when either the lock release button is pressed or the signal level of the LDET (B) terminal is changed from the low level to the high level, the body control unit 27 sends the VBAT ( The power supply to the B) terminal and the V33 (B) terminal may be stopped.

  As described above, when the interchangeable lens is attached to and removed from the camera body (attached state), the lens-side terminal comes into contact with the body-side terminal other than the terminal that should correspond when the attachment is completed. It is desirable that the arrangement of the lens side terminals and the body side terminals is less likely to be caused by contact during attachment and removal.

  In the present embodiment, among the plurality of body side terminals, the LDET (B) terminal is arranged at the forefront of the lens mounting direction (arrow 144 in FIG. 4A). That is, the arrangement position of the LDET (B) terminal is the leftmost side of the body side terminal group in FIG. Similarly, the LDET (L) terminal among the plurality of lens side terminals was also arranged at the forefront of the lens mounting direction (arrow 144 in FIG. 5). That is, the arrangement position of the LDET (L) terminal is the rightmost side of the lens side terminal group in FIG. 5 as described above. Therefore, the LDET (B) terminal does not contact with the lens side terminals other than the LDET (L) terminal until the mounting of the mounting lens is completed. Therefore, the signal level of the LDET (B) terminal is not erroneously changed to a low level in the process of mounting the interchangeable lens, and the lens mounting is not erroneously recognized.

  In the present embodiment, the VBAT (B) terminal is arranged next to the LDET (B) terminal, that is, second from the forefront in the mounting direction. The VBAT (L) terminal is arranged next to the LDET (L) terminal, that is, second from the forefront in the mounting direction. The reason for this is to reduce the number of terminals on the lens side that come into contact with the VBAT (B) terminal on the camera body side during the lens mounting process. Since the voltage applied to the VBAT (B) terminal is higher than the other terminals, the VBAT (B) terminal becomes VBAT (L ) If it comes into contact with a terminal other than the terminal, this high voltage may put an unexpected load on the electric circuit in the interchangeable lens. In the present embodiment, since the VBAT (B) terminal is located next to the LDET (B) terminal, the VBAT (B) terminal includes a plurality of lens side terminals when the interchangeable lens 3 is being mounted. Only the LDET (L) terminal contacts. The LDET (L) terminal is grounded via a resistor (resistor R3 in FIG. 3), and does not affect the camera 1 even if a high voltage is applied from the VBAT (B) terminal.

  In the present embodiment, the PGND (B) terminal is arranged next to the VBAT (B) terminal, that is, third from the forefront in the mounting direction. The PGND (L) terminal is arranged next to the VBAT (L) terminal, that is, third from the forefront in the mounting direction. A high voltage supplied from the VBAT (B) terminal is stored in the capacitor C1 connected to the VBAT (L) terminal. When the interchangeable lens 3 is rotated in the removing direction (the direction opposite to the mounting direction 144), the VBAT (L) terminal first contacts the PGND (B) terminal. The electric charge accumulated in the capacitor C1 is quickly discharged from the PGND (B) terminal, which is a ground terminal, and does not affect other circuits of the camera 1.

  In the present embodiment, the V33 (B) terminal is arranged next to the PGND (B) terminal, that is, the fourth from the leading edge in the mounting direction, and the GND (B) terminal is arranged next to it, that is, the fifth from the leading edge. did. The V33 (L) terminal is arranged next to the PGND (L) terminal, that is, the fourth from the most leading edge in the mounting direction, and the GND (L) terminal is arranged next to that, that is, the fifth from the most leading edge. The capacitor C2 connected to the V33 (L) terminal accumulates the charge supplied from the V33 (B) terminal. When the interchangeable lens 3 is rotated in the removing direction (the direction opposite to the mounting direction 144), the V33 (L) terminal first contacts the GND (B) terminal. The electric charge accumulated in the capacitor C2 is quickly discharged from the GND (B) terminal, which is the ground terminal, and does not affect other circuits of the camera 1.

  The RDY (B) terminal is arranged next to the GND (B) terminal, that is, the sixth from the leading edge, and the DATAB (B) terminal is arranged next to that, that is, the seventh from the leading edge. The 8th CLK (B) terminal is placed, the 9th from the most advanced side is the DATA (B) terminal, and the 10th from the most recent side is the HCLK (B) terminal. The HDATA (B) terminal is arranged at the rearmost end adjacent to it.

  The RDY (L) terminal is arranged next to the GND (L) terminal, that is, the sixth from the leading edge, and the DATAB (L) terminal is arranged next to that, that is, the seventh from the leading edge. The 8th CLK (L) terminal is arranged, the 9th from the most advanced side is the DATA (L) terminal, and the 10th from the most advanced side is the HCLK (L) terminal. The HDATA (L) terminal is arranged at the rearmost end next to it.

  Next, the influence of noise exerted by the communication line composed of each body side terminal and each lens side terminal will be described. Hot line communication is communication in which information is unilaterally transmitted to the camera body 2 after the start of communication, and is performed frequently (repeated with a very short cycle). During hotline communication, a clock signal (H clock signal) on the interchangeable lens side is sent from the HCLK (L) terminal to the HCLK (B) terminal. Since the clock signal is a signal that repeats a high level and a low level in a short cycle, it can be a large noise source with respect to other signals. Furthermore, since the interchangeable lens side clock signal (H clock signal) transmitted from the HCLK (L) terminal to the HCLK (B) terminal is a signal output from the interchangeable lens 3, noise is erroneously added to the clock signal. However, the camera body 2 side cannot recognize the noise. As described above, there is a possibility that the clock signal (H clock signal) flowing through the HCLK terminal may become a noise source or noise may be added to the clock signal (H clock signal), which may cause malfunction of the camera 1. . Examples of malfunctions include erroneous detection of the attachment of an interchangeable lens and incorrect command data communication.

In this embodiment, the HCLK terminal is arranged at a position away from the VBAT terminal to which a high voltage is applied. Since the voltage / current of the VBAT terminal that drives the lens driving unit 33 of the interchangeable lens 3 varies depending on the driving state of the lens driving unit 33, the variation of the voltage / current of the VBAT terminal may become noise for other terminals. is there. Therefore, by separating the VBAT terminal from the HCLK terminal, it is possible to suppress the influence of noise due to the voltage / current fluctuation of the VBAT terminal on the clock signal (H clock signal). That is, it is possible to suppress noise from being applied to the clock signal (H clock signal).
As described above, the RDY terminal is a terminal used to indicate whether command communication is possible. In this embodiment, the HCLK terminal that can be a noise source is arranged so as not to be adjacent to the RDY terminal. Therefore, it is possible to suppress noise due to the clock signal (H clock signal) from affecting the signal at the RDY terminal.

  Further, an HDATA terminal and a DATA terminal are arranged on both sides of the HCLK terminal. By doing so, it is possible to suppress the influence of noise at the HCLK terminal on other than the HDATA terminal and the DATAL terminal. The signal flowing through the HDATA terminal and the DATAL terminal has less fluctuation than the clock signal (H clock signal). Therefore, it is possible to suppress the influence due to the fluctuation of the clock signal (H clock signal) from reaching the terminals other than the HDATA terminal and the DATAL terminal.

Next, command data communication is communication in which information is bidirectionally transmitted and received between the camera body 2 and the interchangeable lens 3 as described above. During command data communication, a clock signal (C clock signal) on the camera body side is sent from the CLK (B) terminal to the CLK (L) terminal. The clock signal (C clock signal) transmitted at the CLK terminal can also be a noise source for the same reason as described above.
Further, if noise is added to the clock signal (C clock signal), an error occurs in the command communication. Therefore, in this embodiment, the CLK terminal is arranged at a position away from the VBAT terminal to which a high voltage is applied. Since the voltage / current of the VBAT terminal that drives the lens driving unit 33 of the interchangeable lens 3 varies depending on the driving state of the lens driving unit 33, the variation of the voltage / current of the VBAT terminal may become noise for other terminals. is there. Therefore, by separating the VBAT terminal from the CLK terminal, it is possible to suppress the noise of the VBAT terminal from affecting the clock signal (C clock signal). That is, it is possible to suppress noise from being applied to the clock signal (C clock signal).
Further, the CLK terminal is arranged so as not to be adjacent to the RDY terminal used to indicate whether command communication is possible.

Further, when the HCLK terminal and the CLK terminal are adjacent to each other, one clock signal affects the other clock signal and can be a noise source. In this embodiment, the DATAL terminal is arranged between the CLK terminal and the HCLK terminal. A DATAB terminal is arranged between the CLK terminal and the RDY terminal. That is, the DATAL terminal and the DATAB terminal are arranged on both sides of the CLK terminal. Since it did in this way, the influence on the camera 1 of the noise resulting from CLK terminal can be suppressed. Since the signal flowing through the DATAL terminal and the DATAB terminal has less fluctuation than the clock signal (C clock signal), the influence of the fluctuation of the clock signal (C clock signal) can be prevented from affecting other terminals than the DATAL terminal and the DATAB terminal. It is.
If the DATAL terminal is arranged between the CLK terminal and the HCLK terminal, the signal flowing through the DATAL terminal has less fluctuation than the clock signal (C clock signal) at the CLK terminal and the clock signal (H clock signal) at the HCLK terminal. The influence of the fluctuation of the clock signal (C clock signal) of the terminal affects the clock signal (H clock signal) of the HCLK terminal, and the influence of the fluctuation of the clock signal (H clock signal) of the HCLK terminal This is because it can be prevented from reaching the clock signal).

  Further, as described above, it is necessary to determine the level of the RDY terminal in order to perform command data communication. That is, since the signal level of the RDY terminal indicates whether or not command data can be communicated, noise has a great influence on the shooting operation. Here, let us consider a case where the body control unit 27 erroneously recognizes that communication is possible due to noise even though command data cannot be communicated. In this case, the lens control unit 37 cannot receive the command data, but the body control unit 27 transmits the command data, and the body control unit 27 erroneously recognizes that the interchangeable lens 3 performs control according to the command data. However, since the lens control unit 37 cannot accept command data, control according to command data that is erroneously transmitted is not performed. Therefore, the operation of the camera 1 is hindered. Therefore, it is necessary to prevent noise from riding on the signal at the RDY terminal. In order to prevent noise from being applied to the signal at the RDY terminal, it is desirable to arrange a terminal through which a relatively stable signal, that is, a signal with a small change in signal level per unit time flows, on both sides of the RDY terminal. In the present embodiment, the GND terminal and the DATAB terminal are arranged on both sides of the RDY terminal. The GND terminal is stable because it is a ground potential terminal, and the DATAB terminal is a terminal through which a stable signal flows compared to the CLK terminal and the HCLK terminal. Since it did in this way, the influence of the noise which the signal of a RDY terminal receives can be suppressed.

  Next, power (power supply voltage) supplied from the VBAT (B) terminal to the VBAT (L) terminal is used to drive an actuator (for example, a stepping motor) of the lens driving unit 33 of the interchangeable lens 3. Therefore, the current flowing through the VBAT terminal varies greatly depending on whether the actuator is driven or not. Such fluctuations in current become noise sources for signals flowing through other terminals. In this embodiment, the VBAT terminal is arranged at a position distant from the RDY terminal, DATAB terminal, CLK terminal, DATAL terminal used for command data communication, and the HCLK terminal and HDATA terminal used for hot line communication. Further, a GND terminal, a V33 terminal, and a PGND terminal are arranged between the VBAT terminal and the terminals used for these communications. Thereby, the influence which the noise resulting from the fluctuation | variation of the electric current which flows through a VBAT terminal has on data communication is suppressed.

The terminal arrangement in consideration of the noise described above will be summarized here.
The RDY terminal is arranged so as not to be adjacent to any of the VBAT terminal and the HCLK terminal which are noise sources. As a result, the influence of noise on the RDY terminal used to indicate whether command data communication is possible can be suppressed.
The HCLK terminal as a noise source is sandwiched between the HDATA terminal and the DATA terminal, and the CLK terminal is sandwiched between the DATA terminal and the DATA B terminal. That is, the HDATA terminal, the HCLK terminal, the DATAL terminal, the CLK terminal, and the DATAB terminal are arranged in order from the rear end in the mounting direction. Thereby, the influence by the noise resulting from the clock signal to the RDY terminal or the like can be suppressed.

  Further, in consideration of the influence of noise, the power supply terminal group and the terminal group used for communication are arranged apart from each other across the RDY terminal. More specifically, a VBAT terminal, a PGND terminal, a V33 terminal, and a GND terminal, which are power supply terminals, are arranged in order from the front end side on the front end side in the mounting direction across the RDY terminal, and communication is performed on the rear end side in the mounting direction. The DATAB terminal, the CLK terminal, the DATAL terminal, the HCLK terminal, and the HDATA terminal, which are terminals to be used, are arranged in this order from the tip side. Thereby, it is possible to suppress the influence of the power supply system terminal group such as the VBAT terminal on the terminals used for communication. Further, the influence of noise on the power supply system terminal group such as the VBAT terminal and the RDY terminal of the terminal group used for communication such as the HCLK terminal and the CLK terminal can be suppressed.

  In the HCLK terminal to which the clock signal on the interchangeable lens side used for hotline communication is sent and the CLK terminal to which the clock signal on the camera body side used for command data communication is sent, the HCLK terminal is further away from the VBAT terminal than the CLK terminal. Placed in position. This is because the clock signal sent to the interchangeable lens 3 at the CLK terminal is output by the body control unit 27 via the first body communication unit 28, but the HCLK (L) terminal from the interchangeable lens 3 via the second lens communication unit 39. When the noise is added to the clock signal transmitted from the interchangeable lens that is sent to the camera body 2 via the camera body, the body control unit 27 erroneously recognizes it. For this reason, noise on the clock signal at the HCLK terminal has a greater influence on the camera 1.

In the HCLK terminal and the GND terminal, the HCLK terminal is arranged at a position farther from the VBAT terminal than the GND terminal. Further, a PGND terminal is disposed between the GND terminal and the VBAT terminal. Thereby, it is possible to shield noise caused by the VBAT terminal to the HCLK terminal to which the clock signal used for hot line communication is sent.
In the CLK terminal and the GND terminal, the CLK terminal is arranged at a position farther from the VBAT terminal than the GND terminal. Further, a PGND terminal is disposed between the GND terminal and the VBAT terminal. Thereby, it is possible to shield noise caused by the VBAT terminal to the CLK terminal to which the clock signal used for command data communication is sent.

  Using the terminal group arranged in this way, as described above, the interchangeable lens 3 and the camera body 2 are transmitted by the first lens communication unit 38 and the first body communication unit 28 using the RDY signal, the CLK signal, the DATAB signal, and Command data communication using the DATAL signal is performed. The interchangeable lens 3 and the camera body 2 perform hot line communication using the HCLK signal and the HDATA signal by the second lens communication unit 39 and the second body communication unit 29. The communication path used for command data communication is provided separately from the communication path for performing hot line communication, and the command data communication and the hot line communication can be performed in parallel. That is, even when the first lens communication unit 38 is performing command data communication with the first body communication unit 28, the second lens communication unit 39 arbitrarily performs hot line communication with the second body communication unit 29. It is possible. Further, even when the second lens communication unit 39 is performing hotline communication with the second body communication unit 29, the first lens communication unit 38 arbitrarily performs command data communication with the first body communication unit 28. It is possible.

(Terminal arrangement considering wear)
Hereafter, contact of each terminal when the interchangeable lens 3 is attached to and detached from the camera body 2 will be described.
When the interchangeable lens 3 is attached to the camera body 2, the body side terminals come into contact with the lens side terminals one after another. The same applies when the interchangeable lens 3 is removed from the camera body 2. That is, the body side terminal that is a pin protruding from the body side connecting portion 202 and the lens side terminal that is an exposed conductive contact surface are rubbed one after another. Since a plurality of interchangeable lenses are attached to and detached from one camera body, the body side terminal is more easily worn than the lens side terminal. In particular, the body-side terminal located on the rear end side in the mounting direction of the interchangeable lens 3 is rubbed against a larger number of lens-side terminals and rubs more. Therefore, the wear on the tip of the pin is more likely to progress toward the body side terminal located on the rear end side than on the body side terminal located on the front end side. Since wear on the body side terminal affects the contact with the lens side terminal, data communication may become unstable.
In the present embodiment, since the LDET (B) terminal is disposed at the most distal end in the mounting direction, the wear of the LDET (B) terminal is the least. Accordingly, the LDET (B) terminal and the LDET (L) terminal are in good contact with each other, and there is little possibility of erroneously detecting the attachment / detachment of the interchangeable lens 3.

  As described above, in this embodiment, the CLK (B) terminal and the HCLK (B) terminal are arranged at a position away from the VBAT (B) terminal in order to suppress the influence of noise on communication. In other words, the VBAT (B) terminal is disposed second from the front end side in the mounting direction, and the CLK (B) terminal and the HCLK (B) terminal are disposed on the rear end side away from the VBAT (B) terminal. Therefore, the CLK (B) terminal and the HCLK (B) terminal wear more than the LDET (B) terminal and the VBAT (B) terminal. In the present embodiment, the CLK (B) terminal and the HCLK (B) terminal are arranged in the immediate vicinity of the body side first claw portion 129a. That is, the CLK (B) terminal and the HCLK (B) terminal are arranged at positions closer to the inner peripheral edge, which is the inner peripheral edge of the body-side first claw portion 129a than the VBAT (B) terminal. In other words, the distance between the CLK (B) terminal and the inner peripheral edge of the body side first claw portion 129a is shorter than the distance between the VBAT (B) terminal and the inner peripheral edge of the body side first claw portion 129a, and HCLK (B ) The distance between the terminal and the inner peripheral edge of the body side first claw portion 129a is shorter than the distance between the VBAT (B) terminal and the inner peripheral edge of the body side first claw portion 129a. As described above, the first plate spring 141a is provided on the back side of the body-side first claw portion 129a, and the lens-side first claw portion 139a is pressed in the + Z direction (FIG. 1) by the first plate spring 141a.

  From the viewpoint of the first leaf spring 141a, the distance between the CLK (B) terminal and the first leaf spring 141a and the distance between the HCLK (B) terminal and the first leaf spring 141a are both VBAT ( B) It is shorter than the distance between the terminal and the first leaf spring 141a. The LDET (B) terminal is the same as the VBAT (B) terminal. The distance between the CLK (B) terminal and the first leaf spring 141a and the distance between the HCLK (B) terminal and the first leaf spring 141a are Is shorter than the distance between the LDET (B) terminal and the first leaf spring 141a. Thus, the CLK (B) terminal and the HCLK (B) terminal are pressed more strongly against the lens side terminal than the VBAT (B) terminal and the LDET (B) terminal.

  Also on the lens side, the CLK (L) terminal and the HCLK (L) terminal are arranged closer to the inner peripheral edge of the lens side first claw portion 139a than the VBAT (L) terminal. In other words, the distance between the CLK (L) terminal and the inner peripheral edge of the lens side first claw portion 139a is shorter than the distance between the VBAT (L) terminal and the inner peripheral edge of the lens side first claw portion 139a, and HCLK (L ) The distance between the terminal and the inner peripheral edge of the lens side first claw portion 139a is shorter than the distance between the VBAT (L) terminal and the inner peripheral edge of the lens side first claw portion 139a. Therefore, the CLK (L) terminal and the HCLK (L) terminal near the lens-side first claw portion 139a are pressed against the corresponding body-side terminals by the first leaf springs 141a in the mounted state.

  The LDET (L) terminal is also the same as the VBAT (L) terminal, and the distance between the CLK (L) terminal and the first leaf spring 141a in the mounted state and the distance between the HCLK (L) terminal and the first leaf spring 141a. The distance is shorter than the distance between the LDET (L) terminal and the first leaf spring 141a. As a result, the CLK (L) terminal and the HCLK (L) terminal are more strongly pressed against the body side terminal than the LDET (L) terminal in the mounted state. Thereby, even if the CLK (B) terminal and the HCLK (B) terminal are worn, good contact can be maintained, the respective clock signals are stabilized, and stable data communication can be performed. Further, for example, even if an impact is applied to the camera body 2 or the interchangeable lens 3 while maintaining the mounting completion state, the contact between the CLK (B) terminal and the CLK (L) terminal and the HCLK (B) terminal and the HCLK (L) terminal Contact with is kept.

  Even if a part of the lens-side first claw portion 139a is cut out, the entire projection portion and the cut-out portion arranged in the region facing the body-side first claw portion 129a are combined on the lens side. The first claw portion is used. As a notch method, the lens side claw part may be cut out so as to be divided into two or more in the circumferential direction, or the lens side claw part may be cut out so as to be partially cut off. At least a portion may be cut out so that the length in the radial direction is shortened. Moreover, you may change the length of the circumferential direction of a lens side nail | claw part in the range which passes a corresponding body side insertion / extraction part. The same applies to the lens side second claw portion 139b, the lens side third claw portion 139c, and the lens side fourth claw portion 139d. In addition, the thickness of the cylindrical portion in the radial direction can be changed as appropriate, and at least a part of the cylindrical portion may protrude inside the cylindrical portion of the present embodiment.

  As described above, the CLK (B) terminal and the HCLK (B) terminal wear more than the LDET (B) terminal and the VBAT (B) terminal. In the present embodiment, the CLK (B) terminal and the HCLK (B) terminal are arranged in the immediate vicinity of the body side first claw portion 129a. That is, the CLK (B) terminal and the HCLK (B) terminal are arranged at a position closer to the inner peripheral edge of the body-side first claw portion 129a than the LDET (B) terminal and the VBAT (B) terminal. In other words, the distance between the CLK (B) terminal and the inner peripheral edge of the body side first claw portion 129a is larger than the distance between the LDET (B) terminal or the VBAT (B) terminal and the inner peripheral edge of the body side first claw portion 129a. The distance between the HCLK (B) terminal and the inner peripheral edge of the body side first claw portion 129a is shorter than the distance between the LDET (B) terminal or the VBAT (B) terminal and the inner peripheral edge of the body side first claw portion 129a. short. As described above, the first plate spring 141a is provided on the back side of the body-side first claw portion 129a, and the lens-side first claw portion 139a is pressed in the + Z direction (FIG. 1) by the first plate spring 141a. From the viewpoint of the first leaf spring 141a, the distance between the CLK (B) terminal and the first leaf spring 141a and the distance between the HCLK (B) terminal and the first leaf spring 141a are both LDET ( B) The distance is shorter than the distance between the terminal or VBAT (B) terminal and the first leaf spring 141a.

  Also on the lens side, the CLK (L) terminal and the HCLK (L) terminal are arranged closer to the inner peripheral edge of the lens side first claw portion 139a than the LDET (L) terminal and the VBAT (L) terminal. In other words, the distance between the CLK (L) terminal and the inner peripheral edge of the lens side first claw portion 139a is larger than the distance between the LDET (L) terminal or the VBAT (L) terminal and the inner peripheral edge of the lens side first claw portion 139a. The distance between the HCLK (L) terminal and the inner peripheral edge of the lens side first claw portion 139a is shorter than the distance between the LDET (L) terminal or the VBAT (L) terminal and the inner peripheral edge of the lens side first claw portion 139a. short. Therefore, the CLK (L) terminal and the HCLK (L) terminal near the lens side first claw portion 139a are pressed against the corresponding body side terminals by the first leaf spring 141a. Thus, the CLK (B) terminal and the HCLK (B) terminal are pressed more strongly against the lens side terminal than the LDET (B) terminal and the VBAT (B) terminal. Thereby, even if the CLK (B) terminal and the HCLK (B) terminal are worn, good contact can be maintained, and stable communication can be performed. Further, for example, even if an impact is applied to the camera body 2 or the interchangeable lens 3 while the mounting completion state is maintained, contact between the CLK (B) terminal and the HCLK (B) terminal and the lens side terminal is maintained.

  In the present embodiment, the CLK (B) terminal and the HCLK (B) terminal are also near the body side fourth claw portion 129d. That is, the CLK (B) terminal and the HCLK (B) terminal are arranged at a position closer to the body side fourth claw portion 129d than the VBAT (B) terminal and the LDET (B) terminal. In other words, the distance between the CLK (B) terminal and the body side fourth claw portion 129d is shorter than the distance between the VBAT (B) terminal or LDET (B) terminal and the body side fourth claw portion 129d, and HCLK (B ) The distance between the terminal and the body side fourth claw portion 129d is shorter than the distance between the VBAT (B) terminal or the LDET (B) terminal and the body side fourth claw portion 129d. As described above, there is the fourth leaf spring 141d on the back side of the body side fourth claw portion 129d, and the lens side fourth claw portion 139d is pressed in the + Z direction (FIG. 1) by the fourth leaf spring 141d. Therefore, the CLK (B) terminal and the HCLK (B) terminal near the lens side fourth claw portion 139d are connected to the VBAT (B) terminal and the LDET (B) terminal by the first leaf spring 141a and the fourth leaf spring 141d. Can be stably pressed against the lens side terminal.

  The distance between the CLK (B) terminal and the body side first claw portion 129a (the same applies to the body side fourth claw portion 129d, but will be omitted below) is the distance between one end of the body side first claw portion 129a and This is a linear distance from the CLK (B) terminal, and may be defined by a linear distance between the other end of the body side first claw portion 129a and the CLK (B) terminal. Alternatively, the above-described distance between the CLK (B) terminal and the body-side first claw portion 129a is an intermediate position of the body-side first claw portion 129a in the circumferential direction of the body-side mount portion 201 and CLK (B). You may prescribe | regulate by the linear distance with a terminal. Similarly, the distance between other body side terminals such as the HCLK (B) terminal, VBAT (B) terminal, LDET (B) terminal and the body side first claw portion 129a is also a linear distance. Similarly, the distance between the first leaf spring 141a (fourth leaf spring 141d) and the body side terminal is also a linear distance.

  The distance between the above-described CLK (B) terminal and the body side first claw portion 129a (the same applies to the body side fourth claw portion 129d, but will be omitted below) is the circumferential direction of the body side mount portion 201. May be defined as an arc-shaped distance between one end of the body-side first claw portion 129a and the CLK (B) terminal, or an arc-shaped distance between the other end of the body-side first claw portion 129a and the CLK (B) terminal. May be defined as the distance. Alternatively, the above-described distance between the CLK (B) terminal and the body-side first claw portion 129a is an intermediate position of the body-side first claw portion 129a in the circumferential direction of the body-side mount portion 201 and CLK (B). You may prescribe | regulate as an arc-shaped distance with a terminal. The distance between other body side terminals such as the HCLK (B) terminal, VBAT (B) terminal, and LDET (B) terminal and the body side first claw portion 129a may be similarly defined as an arcuate distance. Similarly, the distance between the first leaf spring 141a (fourth leaf spring 141d) and the body side terminal may be defined as an arcuate distance.

  Although the above has been described for the camera body 2, the same applies to the interchangeable lens 3. In the present embodiment, the CLK (L) terminal and the HCLK (L) terminal are arranged in the immediate vicinity of the lens side first claw portion 139a. That is, the CLK (L) terminal and the HCLK (L) terminal are arranged at a position closer to the lens side first claw portion 139a than the VBAT (L) terminal and the LDET (L) terminal. In other words, the distance between the CLK (L) terminal and the lens side first claw 139a is shorter than the distance between the VBAT (L) terminal or the LDET (L) terminal and the lens side first claw 139a, and HCLK (L The distance between the terminal and the lens side first claw 139a is shorter than the distance between the VBAT (L) terminal or the LDET (L) terminal and the lens side first claw 139a. The lens side first claw portion 139a is pressed in the + Z direction (FIG. 1) by the first leaf spring 141a on the body side. Therefore, the CLK (L) terminal and the HCLK (L) terminal near the first claw portion 139a on the lens side are more body than the VBAT (L) terminal or the LDET (L) terminal by the first leaf spring 141a. Strongly pressed against the side terminal.

  In this embodiment, as shown in FIG. 4A, the CLK (B) terminal and the HCLK (B) terminal are connected to the center position of the opening of the body side mount portion 201 (that is, the position of the optical axis L of the interchangeable lens 3). ) And the arcuate body-side first claw portion 129a. Alternatively, the CLK (B) terminal and the HCLK (B) terminal are connected to the center position of the opening of the body side mount portion 201 (that is, the position of the optical axis L of the interchangeable lens 3) and the inner peripheral side of the body side first claw portion 129a. It was arranged inside a triangular area formed by both ends. Therefore, the body side first claw portion 129a does not exist on the extended line of the alternate long and short dash line 151 connecting the center position of the opening of the body side mount portion 201 and the LDET (B) terminal, but the center of the opening of the body side mount portion 201 is not present. The body side first claw portion 129a exists on the extended line of the alternate long and short dash line 152 connecting the position and the HCLK (B) terminal, and the alternate long and short dash line connecting the center position of the opening of the body side mount unit 201 and the CLK (B) terminal. A body-side first claw portion 129a exists on the extended line 153. Thereby, in the mounting completion state, the CLK (B) terminal and the HCLK (B) terminal are pressed more strongly against the corresponding lens side terminal than the LDET (B) terminal.

  As shown in FIG. 5, the CLK (L) terminal and the HCLK (L) terminal are connected to the center position of the opening of the lens side mount portion 301 (that is, the position of the optical axis L of the interchangeable lens 3) and the first lens side on the arcuate lens side. It arrange | positioned inside the sector shape (range of the angle 60) formed with the nail | claw part 139a. Alternatively, the CLK (L) terminal and the HCLK (L) terminal are connected to the center position of the opening of the lens side mount portion 301 (that is, the position of the optical axis L of the interchangeable lens 3) and both ends on the outer peripheral side of the lens side first claw portion 139a. And placed inside the triangular area formed by. Therefore, the lens-side first claw portion 139a does not exist on the extended line of the alternate long and short dash line 161 connecting the center position of the opening of the lens-side mount portion 301 and the LDET (L) terminal, but the center of the opening of the lens-side mount portion 301 is not present. The lens side first claw portion 139a exists on the extended line of the alternate long and short dash line 162 connecting the position and the HCLK (L) terminal, and the alternate long and short dash line connecting the center position of the opening of the lens side mount unit 301 and the CLK (L) terminal. A lens-side first claw portion 139a exists on the extended line of H.163. Thereby, in the mounting completion state, the CLK (L) terminal and the HCLK (L) terminal come into contact with the corresponding body side terminal more stably than the LDET (L) terminal. In other words, the CLK (L) terminal and the HCLK (L) terminal are more strongly pressed against the body side terminal than the LDET (L) terminal. Therefore, even when the tips of the CLK (B) terminal and the HCLK (B) terminal are worn, the communication of the clock signal between the camera body 2 and the interchangeable lens 3 is performed stably.

  Note that although the CLK (B) terminal, the CLK (L) terminal, the HCLK (B) terminal, and the HCLK (L) terminal have been described in this embodiment mode, the HDATA (B) terminal, HDATA, which are other communication terminals. The same applies to the (L) terminal, the DATAL (B) terminal, the DATAL (L) terminal, the DATAB (B) terminal, and the DATAB (L) terminal. That is, the HDATA (B) terminal, DATAL (B) terminal, and DATAB (B) terminal are arranged closer to the body side first claw portion 129a and the first leaf spring 141a than the LDET (B) terminal and VBAT (B) terminal. (Distance is short). As a result, the HDATA (B) terminal, DATAL (B) terminal, and DATAB (B) terminal are pressed more strongly against the lens side terminal than the VBAT (B) terminal and the LDET (B) terminal, Good contact can be maintained. The HDATA (L) terminal, DATAL (L) terminal, and DATAB (L) terminal are arranged closer to the lens side first claw portion 139a than the LDET (L) terminal and VBAT (L) terminal (the distance is short). As a result, the HDATA (L) terminal, DATAL (L) terminal, and DATAB (L) terminal are pressed more strongly against the body side terminal than the VBAT (L) terminal and LDET (L) terminal, Good contact can be maintained.

  A value indicating the communication specification of the hot line communication is transmitted and received between the interchangeable lens 3 and the camera body 2 by command data communication. This value is called a generation. This generation value may be referred to as generation information. The generation is usually an integer of 0 or more, but may be a decimal number. Generations may also be called grades. FIG. 6 is an explanatory diagram showing an example of generations. Generations indicate different communication specifications. This communication specification may be referred to as a communication method, a communication method, or a communication standard. This communication specification has at least one item related to communication. In the example illustrated in FIG. 6, the communication specifications include three items relating to communication: the communication speed of hotline communication, the communication interval of hotline communication, and the number of data transmitted by hotline communication. The communication specification indicated by the generation is not limited to having the three items described above, and may have any one or two items selected from the three items.

  By using generations, for example, different generations such as the first to fourth generations can be shown. The communication specifications shown vary depending on the generation. Here, the values of some items of the communication specifications shown may be the same between different generations. A generation with a large number is called a higher generation (grade). For example, the fourth generation is a higher generation (grade) than the third generation. Further, the generation may indicate other specifications in addition to the communication specifications. In the example shown in FIG. 6, the generation indicates a sampling interval specification for data generation in addition to the communication specification. In addition to the above-described example, the generation may indicate specifications related to the function / capability of camera shake correction, for example.

  Here, the communication speed is a communication speed (clock frequency) of data communicated by hot line communication, that is, a speed at which data is transferred from the second lens communication unit 39 to the second body communication unit 29. The communication interval is a time interval for transferring data by hot line communication. Data to be transmitted from the interchangeable lens 3 to the camera body 2 by hotline communication includes information on driving of the focus lens (information on the position of the focus lens, etc.) and information on driving of the image stabilization lens (information on the position of the image stabilization lens). Etc.), information relating to the zoom lens (information relating to the state of the zoom lens, focal length information, etc.), information relating to driving of the aperture stop 32 (information relating to the F value, etc.), and the like. The sampling interval is a time interval for sampling data to be transmitted by hot line communication. For example, this is the interval at which the lens control unit 37 samples the pulse signal generated by the lens position detection unit 34.

  In the example shown in FIG. 6, in the communication specification indicated by the first generation, the communication speed is V1 (unit is, for example, MHz), the communication interval is T1 (the unit is, for example, msec), and the number of data is N1 (integer). . For example, as the generation progresses (the grade increases), the communication speed increases, the communication interval decreases, and the number of data increases. That is, in the communication specification shown by the second generation, the communication speed is V2 faster than V1, the communication interval is T2 shorter than T1, and the number of data is N2 larger than N1.

  In the communication specification shown by the third generation, the communication speed is V3 faster than V2, the communication interval is T3 shorter than T2, and the number of data is N3 larger than N2. In the communication specification indicated by the fourth generation, the communication speed is V4 faster than V3, the communication interval is T4 shorter than T3, and the number of data is N4 larger than N3. Each of V1 to V4, T1 to T4, and N1 to N4 may be a predetermined fixed value or a value in a predetermined range. For example, the communication speed V1 may be a predetermined fixed value (for example, 2.5 MHz) or a predetermined communication speed range v1 to v2 (for example, 2 to 8 MHz). The communication interval T1 may be a predetermined eigenvalue (for example, 1 msec) or a predetermined communication interval range (for example, 0.5 to 2 msec).

  As described above, the data transmitted by the hotline communication includes information on the focus lens drive, the anti-vibration lens drive, the aperture stop drive, and the zoom lens state. For example, when the number of data is N1, the data transmitted by the hotline communication is information related to driving of the focus lens. When the number of data is N2, in addition to information related to driving of the focus lens, information related to driving of the anti-vibration lens is also transmitted by hotline communication. When the number of data is N3, in addition to information related to the driving of the focus lens and information related to the driving of the anti-vibration lens, information related to the driving of the aperture stop 32 is also transmitted by hotline communication. Further, when the number of data is N4, in addition to information related to the driving of the focus lens, information related to the driving of the anti-vibration lens, and information related to the driving of the aperture stop 32, information related to the state of the zoom lens is also obtained by hotline communication. Sent.

  In the example illustrated in FIG. 6, the number of data transmitted by the hotline communication indicated by the generation is described as being included in the communication specification. However, the number of data may not be included in the communication specification, and may be indicated by generation separately from the communication specification. In the example described above, the generation is described as indicating the number of data. However, the generation may indicate data transmitted by hotline communication. For example, information on driving the focus lens (information on the position of the focus lens, etc.), information on driving of the anti-vibration lens (information on the position of the anti-vibration lens, etc.), information on the zoom lens (information on the state of the zoom lens, focus The generation may indicate data transmitted by hot line communication, such as distance information and the like, information relating to driving of the aperture stop 32 (information relating to the F value, and the like).

  In the example shown in FIG. 6, the sampling interval is S1 (the unit is, for example, msec) in the specification of the sampling interval indicated by the first generation. In the specification of the sampling interval indicated by the second generation, the sampling interval is S2 shorter than S1, and in the specification of the sampling interval indicated by the third generation, the sampling interval is S3 shorter than S2, and the sampling indicated by the fourth generation In the interval specification, the sampling interval is S4 shorter than S3. Here, S1 to S4 may also be predetermined fixed values or values within a predetermined range.

  As the generation (grade) changes from the first to the fourth generation, it is not necessary to change the values of all items of the communication specification and other specifications, so that the value of any one or more items is changed. It may be. For example, as the generation progresses, the communication speed increases, but the communication interval and the number of data may not change. As described above, each generation of hotline communication may indicate the specification of the sampling interval and the function / capability of camera shake correction in addition to the communication specification. In this case, as the generation changes, only the value of one item of the communication specification may be changed, or the values of two or three items of the communication specification may be changed. In addition to the specifications, the specifications regarding the sampling interval and the functions / capabilities of camera shake correction may be changed.

  Next, the communication specifications indicated by the generation and the relationship between the interchangeable lens 3 and the camera body 2 will be described. The interchangeable lens 3 and the camera body 2 capable of hotline communication with the communication specifications indicated by the first generation are referred to as a first generation interchangeable lens 3 and a first generation camera body 2, respectively. The interchangeable lens 3 and the camera body 2 capable of hotline communication with the communication specifications indicated by the second generation are referred to as a second generation interchangeable lens 3 and a second generation camera body 2, respectively. Similarly, the interchangeable lens 3 and the camera body 2 capable of hotline communication with the communication specifications indicated by the third generation are referred to as a third generation interchangeable lens 3 and a third generation camera body 2, respectively. The interchangeable lens 3 and the camera body 2 capable of hotline communication with the communication specifications indicated by the fourth generation are referred to as a fourth generation interchangeable lens 3 and a fourth generation camera body 2.

  In the present embodiment, a plurality of interchangeable lenses and a plurality of camera bodies each having a function capable of communicating with a common communication specification called “communication specification indicated by the first generation” are collectively referred to as “first generation It was called “Interchangeable Lens” and “First Generation Camera Body”. The same applies to the second generation, the third generation, and the fourth generation. The “communication specification indicated by the first generation” may be referred to as “first communication specification”. The “first generation interchangeable lens” and the “first generation camera body” may be referred to as a “first interchangeable lens” and a “first camera body”, respectively.

  In addition, the interchangeable lens 3 and the camera body 2 corresponding to the communication specification indicated by each generation can also perform hotline communication according to the communication specification indicated by the previous generation (a generation with a small number and a low grade). . That is, both the first generation interchangeable lens 3 and the first generation camera body 2 perform hotline communication in accordance with the communication specifications indicated by the first generation. However, in the second generation interchangeable lens 3 and the camera body 2, In addition to the communication specifications indicated by the second generation, the communication specifications indicated by the first generation can be supported. Further, in the third generation interchangeable lens 3 and the camera body 2, the communication specifications indicated by the first to third generations respectively, and in the fourth generation interchangeable lens 3 and the camera body 2, the first to fourth generations respectively indicate. Compatible with communication specifications. If the fourth generation interchangeable lens 3 and the third generation camera body 2 are combined, the communication specifications indicated by the third generation, the communication specifications indicated by the second generation, and the first generation indicated by the first generation are common communication specifications. Hotline communication can be performed according to any of the communication specifications. However, since the camera body 2 does not support the communication specification indicated by the fourth generation, hot line communication according to the communication specification indicated by the fourth generation cannot be performed. Or hotline communication is not started.

FIG. 7 illustrates a generation showing communication specifications used when performing hotline communication when the first generation to fourth generation interchangeable lens 3 and the first generation to fourth generation camera body 2 are combined. It is a table to do. FIG. 7 illustrates generations in which the generation of the camera body 2 is taken on the horizontal axis and the generation of the interchangeable lens 3 is taken on the vertical axis, and the communication specifications of hot line communication by each combination are shown.
As shown below, hotline communication is performed with the communication specifications shown by the highest generation (the highest number / highest generation, the highest grade) that can be taken when the interchangeable lens 3 and the camera body 2 are combined. Preferably it is done. However, hotline communication may be performed using communication specifications indicated by lower generations instead of the highest generation.
When the first-generation interchangeable lens 3 is attached to the first-generation to fourth-generation camera bodies 2, hotline communication is performed according to the communication specification indicated by the first generation in any case.

  When the second generation interchangeable lens 3 is attached to the first to fourth generation camera body 2, hotline communication is performed with the first generation camera body 2 in accordance with the communication specification indicated by the first generation, Hotline communication is performed with the second to fourth generation camera bodies 2 in accordance with the communication specifications indicated by the second generation.

  When the third generation interchangeable lens 3 is attached to the first to fourth generation camera bodies 2, the following is performed. The third generation interchangeable lens 3 is in accordance with the communication specifications indicated by the first generation with the first generation camera body 2 and according to the communication specifications indicated by the second generation with the second generation camera body 2. Hot line communication is performed with the generation camera body 2 according to the communication specification indicated by the third generation. The third generation interchangeable lens 3 is not the highest generation (the generation with the highest number / the highest generation, the highest grade) but the generation (the generation with the lower number) of the second generation camera body 2. Communication may be performed in accordance with the communication specification indicated by the first generation (previous generation), and the communication specification indicated by the first generation or the second generation is the third generation camera body 2 and the fourth generation camera body 2. Communication may be performed according to

When the fourth generation interchangeable lens 3 is attached to the first to fourth generation camera bodies 2, the following is performed. The fourth generation interchangeable lens 3 performs hotline communication with the first generation camera body 2 according to the communication specification indicated by the first generation, and with the second generation camera body 2 according to the communication specification indicated by the second generation. Done. Furthermore, the 4th generation interchangeable lens 3 has a hot line according to the 3rd generation camera body 2 according to the 3rd generation communication specifications, and the 4th generation camera body 2 according to the 4th generation communication specifications. Communication takes place.
Note that the fourth generation interchangeable lens 3 may communicate with the second generation camera body 2 in accordance with the communication specifications indicated by the first generation, and the third generation camera body 2 may be the first generation or the second generation. You may communicate according to the communication specification which a generation shows. Further, communication with the fourth generation camera body 2 may be performed in accordance with the communication specification indicated by the first generation, the second generation, or the third generation.

  Next, generation information transmitted from the interchangeable lens 3 to the camera body 2 and conversely from the camera body 2 to the interchangeable lens 3 by command data communication will be described. In command data communication, for example, data indicating lens side generation information “1”, “2”, “3”, or “4” is transmitted from the interchangeable lens 3 to the camera body 2. The lens side generation information “1”, “2”, “3”, or “4” indicates that the interchangeable lens 3 is the first generation, the second generation, the third generation, or the fourth generation, respectively.

  The lens side generation information being the first generation indicates that the interchangeable lens 3 corresponds to the communication specification indicated by the first generation. Similarly, the fact that the lens-side generation information is the second generation indicates that the interchangeable lens 3 corresponds to both the communication specification indicated by the first generation and the communication specification indicated by the second generation. The fact that the lens side generation information is the third generation indicates that the interchangeable lens 3 corresponds to the communication specifications indicated by the three generations of the first generation, the second generation, and the third generation, and the lens side generation information is the fourth generation. The generation indicates that the interchangeable lens 3 corresponds to the communication specifications indicated by the four generations of the first generation, the second generation, the third generation, and the fourth generation.

  As will be described later, generation information transmitted from the camera body 2 to the interchangeable lens 3 is determined by the camera body 2 based on the lens side generation information and the body side generation information, and is attached to the camera body 2 and the camera body 2. The generation which shows the communication specification used when the interchangeable lens 3 made performs hot line communication is represented. In command data communication, for example, generation information “1”, “2”, “3”, or “4” is transmitted from the camera body 2 to the interchangeable lens 3. The generation information “1”, “2”, “3”, or “4” indicates that the communication specifications used when performing hotline communication are the first generation, second generation, third generation, or first generation, respectively. Shown by 4th generation.

  For example, when the second generation information (second generation) is transmitted from the interchangeable lens 3 that supports only the second generation to the camera body 2 that supports only the second generation, the camera body 2 is also the same. Therefore, the second generation, which is the highest generation, is transmitted to the interchangeable lens 3. Transmission of this same generation information (second generation) from the camera body 2 to the interchangeable lens 3 requires the camera body 2 to use the communication specification indicated by the same generation (second generation). It shows that you are doing.

  For example, when the interchangeable lens 3 that supports only up to the third generation is mounted on the fourth generation camera body 2 that is a higher generation, the generation information of the third generation from the interchangeable lens 3 is the camera body. 2, the camera body 2 is the highest generation common to the camera body 2 and the interchangeable lens 3, in this case the third generation that is a lower generation (lower) than its own generation (fourth generation). Generation information is transmitted to the interchangeable lens 3. The generation information of the lower generation (third generation) transmitted from the camera body 2 is to perform hotline communication with the interchangeable lens 3 according to the communication specification indicated by the third generation, which is the highest generation supported by the interchangeable lens 3. Is required.

  For example, when the interchangeable lens 3 that supports up to the fourth generation is attached to the third generation camera body 2 that is a lower generation, the fourth generation information is transmitted from the interchangeable lens 3 to the camera body. However, since the camera body 2 does not correspond to the communication specification indicated by the fourth generation, the camera body 2 transmits the generation information of the third generation that is the highest generation of the camera body 2 to the interchangeable lens 3. The generation information of the lower generation (third generation) for the interchangeable lens 3 transmitted from the camera body 2 is hot according to the communication specification indicated by the third generation, which is the highest generation corresponding to the camera body 2, to the interchangeable lens 3. It is required to perform line communication.

  As described above, generations indicate different communication specifications. The communication specification has at least one item related to communication. Examples of the items related to communication include a communication speed of hot line communication, a communication interval of hot line communication, and the number of data transmitted by hot line communication. Have. The generation information indicates a communication specification in which the interchangeable lens and the camera body can communicate by hot line communication.

A generation determination method indicating communication specifications used in hot line communication between the interchangeable lens 3 and the camera body 2 will be specifically described below.
When the interchangeable lens 3 is attached to the camera body 2, initialization communication is started between the interchangeable lens 3 and the camera body 2 using command data communication. When a command requesting transmission of lens-side generation information is transmitted from the camera body 2 to the interchangeable lens 3 in the initialization communication, the first lens communication unit 38 stores the lens-side generation information stored in the lens memory 36. Is transmitted to the first body communication unit 28 by command data communication. The body control unit 27 acquires the generation information of the mounted interchangeable lens 3 via the first body communication unit 28, and grasps the generation indicating the communication specification that the interchangeable lens 3 can handle. For example, when the generation information of the interchangeable lens 3 is “3” representing the third generation, the body control unit 27 determines that the interchangeable lens 3 is based on the communication specifications indicated by the first generation, the second generation, and the third generation. Recognize that hotline communication is possible.

  And the body control part 27 determines the generation which shows the communication specification at the time of performing hotline communication based on lens side generation information and body side generation information as follows. The highest generation among the generations common to the generation showing the communication specification compatible with the interchangeable lens 3 and the generation showing the communication specification compatible with the camera body 2 is determined as the generation indicating the communication specification of the hotline communication. To do. For example, as described above, the lens-side generation information transmitted from the interchangeable lens 3 is “3”, that is, the interchangeable lens 3 can communicate by hotline communication with the communication specifications indicated by the first generation, the second generation, and the third generation. When the body side generation information is “4” representing the fourth generation, the camera body 2 is a hotline with the communication specifications indicated by the first generation, the second generation, the third generation, and the fourth generation. Since communication by communication is possible, the third generation which is the highest generation among the generations common to the interchangeable lens 3 and the camera body 2 is selected.

  Thus, as shown in FIG. 7, the body control unit 27 is the highest among the generations common between the generation showing the communication specifications supported by the interchangeable lens 3 and the generation showing the communication specifications supported by the camera body 2. Select the generation. Then, the body control unit 27 transmits the determined generation information to the first lens communication unit 38 via the first body communication unit 28. The body control unit 27 controls (sets) each unit of the camera body 2 according to the communication specification indicated by the determined generation. Thereby, the camera body 2 can execute hot line communication with the mounted interchangeable lens 3 in accordance with the communication specification indicated by the determined generation.

When command and data including generation information used for hotline communication is transmitted from the camera body 2 to the interchangeable lens 3 by command data communication, hotline communication is started. Specifically, when a command for setting hotline communication is transmitted from the camera body 2 to the interchangeable lens 3, generation information is also transmitted as a data packet of the command.
At the start of hotline communication, the lens control unit 37 can perform hotline communication according to the generation information determined by the camera body 2, that is, the communication specification indicated by the generation information acquired from the camera body 2 via the first lens communication unit 38. Each part of the interchangeable lens 3 is set and controlled so as to achieve a stable state. As a result, the interchangeable lens 3 can execute hotline communication with the camera body 2 in accordance with the communication specification indicated by the generation determined by the camera body 2.
As described above, when the command for setting the hot line communication and the generation information of the first generation or more are transmitted from the camera body 2 to the interchangeable lens 3, the hot line communication from the interchangeable lens 3 is started. That is, the hot line communication is started when the camera body 2 sends a command for setting the hot line communication and generation information (a value indicating the generation information) indicating the communication specification used for the hot line communication to the interchangeable lens 3. .

  Note that the body control unit 27 may select a communication specification different from the communication specification indicated by the highest generation among the generations to which both the interchangeable lens 3 and the camera body 2 correspond. For example, if the communication specification indicated by the highest generation causes interference between the communication frequency and the drive frequency of the image sensor, this interference is avoided by adopting the communication specification indicated by the lower generation. can do.

  As described above, in the present embodiment, the interchangeable lens 3 transmits a generation indicating communication specifications having items such as a communication speed and a communication interval to the camera body 2 as lens side generation information. The camera body 2 can grasp the communication specifications (communication speed, etc.) that the interchangeable lens 3 can handle by receiving the lens side generation information. Compared to the case where the communication speed, communication interval, etc. that can be handled by the interchangeable lens 3 are individually notified to the camera body 2 by a plurality of communications, the lens side generation information is transmitted from the interchangeable lens 3 to the camera body 2, so that data The amount is reduced, and the communication time and the number of communication can be shortened. If the communication speed, communication interval, etc. that can be handled by the interchangeable lens 3 are individually sent from the interchangeable lens 3 to the camera body 2, whether the communication speed, communication interval, etc. sent from the interchangeable lens 3 are consistent. 2 need to check. However, in this embodiment, since the generation (generation information) indicates a consistent communication specification (communication speed, communication interval, etc.), the body control unit 27 receives the communication speed, communication interval, etc. received from the interchangeable lens 3. There is no need to check for inconsistencies.

  In the description so far, the first generation, the second generation, the third generation, and the fourth generation have been described as examples of the generation information. However, the generation information is not limited to these, and the generation information is the fifth generation or higher generation information. It does not matter.

  In the example described with reference to FIG. 7, the interchangeable lens 3 of each generation has a configuration in which hotline communication can be performed in accordance with the communication specification indicated by the previous generation (generation with a small number / low grade). Next, the interchangeable lens 3 can perform hotline communication only in accordance with the communication specification indicated by one generation, and does not support hotline communication according to the communication specification indicated by the previous generation (smaller generation / lower grade). An example will be described.

  FIG. 8 shows that the interchangeable lens 3 can perform hot-line communication only corresponding to the communication specification indicated by any one of the first generation to the fourth generation, for example. It is a table | surface explaining the generation which shows the communication specification used when performing hotline communication when combining with the 4th generation camera body 2. FIG. Here, similarly to the example described with reference to FIG. 7, the camera body 2 can also perform hotline communication according to the communication specification indicated by the previous generation (generation with a small number / low grade).

  FIG. 8 is a table for explaining generations in which the generation of the camera body 2 is taken on the horizontal axis and the generation of the interchangeable lens 3 is taken on the vertical axis, and the communication specifications of the hotline communication by each combination are shown. A case will be described in which an interchangeable lens 3 capable of communication by hotline communication corresponding only to the communication specification indicated by the first generation is attached to the camera body 2 of each generation. When the interchangeable lens 3 capable of communication by hotline communication corresponding only to the communication specification indicated by the first generation is mounted on the first generation camera body 2, the first lens communication unit 38 is included in the initial communication. The lens side generation information “1” is transmitted to the first body communication unit 28 by command data communication. The body control unit 27 receives the transmitted lens side generation information “1” via the first body communication unit 28. The body control unit 27 of the first generation camera body 2 sets the first generation, which is the highest generation among the generations common to the interchangeable lens 3 and the camera body 2, as the generation indicating the communication specifications of the hotline communication. decide. Then, the body control unit 27 transmits the determined first generation information to the first lens communication unit 38 via the first body communication unit 28. Thereafter, hot line communication is performed between the interchangeable lens 3 and the camera body 2 in accordance with the communication specification indicated by the first generation.

  When the interchangeable lens 3 capable of communication by hotline communication corresponding only to the communication specification indicated by the first generation is mounted on the second generation, third generation, or fourth generation camera body 2, the interchangeable lens 3 and Through the same exchange of command data communication with the camera body 2, the first generation, the highest generation among the generations common to the interchangeable lens 3 and the camera body 2, sets the communication specifications for hotline communication. The hot line communication is performed between the interchangeable lens 3 and the camera body 2 in accordance with the communication specification indicated by the first generation.

  Next, a case where the interchangeable lens 3 capable of communication by hotline communication corresponding only to the communication specification indicated by the second generation is mounted on the camera body 2 of each generation will be described. When the interchangeable lens 3 capable of communication by hotline communication corresponding only to the communication specification indicated by the second generation is mounted on the second generation camera body 2, the first lens communication unit 38 is included in the initial communication. Then, “2” is transmitted as lens side generation information to the first body communication unit 28 by command data communication. The body control unit 27 receives the transmitted lens side generation information “2” via the first body communication unit 28. The body control unit 27 of the second generation camera body 2 sets the second generation, which is the highest generation among the generations common to the interchangeable lens 3 and the camera body 2, as the generation indicating the communication specifications of the hotline communication. decide. Then, the body control unit 27 transmits the determined second generation information to the first lens communication unit 38 via the first body communication unit 28. Thereafter, hot line communication is performed between the interchangeable lens 3 and the camera body 2 in accordance with the communication specification indicated by the second generation.

  When the interchangeable lens 3 capable of communication by hotline communication corresponding only to the communication specification indicated by the second generation is attached to the third or fourth generation camera body 2, the interchangeable lens 3 and the camera body 2 Through the same exchange of command data communication, the second generation, the highest generation among the generations common to the interchangeable lens 3 and the camera body 2, is determined as the generation indicating the communication specifications of the hotline communication. Then, hot line communication is performed between the interchangeable lens 3 and the camera body 2 in accordance with the communication specification indicated by the second generation.

  When the interchangeable lens 3 capable of hotline communication only corresponding to the communication specification indicated by the second generation is attached to the first generation camera body 2, the interchangeable lens 3 and the camera body 2 do not have a common generation. Hotline communication does not work properly. Or hotline communication is not started.

  Next, a case where the interchangeable lens 3 capable of communication by hotline communication corresponding only to the communication specification indicated by the third generation is mounted on the camera body 2 of each generation will be described. When the interchangeable lens 3 capable of communication by hotline communication corresponding only to the communication specification indicated by the third generation is mounted on the third generation camera body 2, the first lens communication unit 38 is included in the initial communication. The lens side generation information “3” is transmitted to the first body communication unit 28 by command data communication. The body control unit 27 receives the transmitted lens side generation information “3” via the first body communication unit 28. The body control unit 27 of the third generation camera body 2 sets the third generation, which is the highest generation among the generations common to the interchangeable lens 3 and the camera body 2, as the generation indicating the communication specifications of the hotline communication. decide. Then, the body control unit 27 transmits the determined third generation information to the first lens communication unit 38 via the first body communication unit 28. Thereafter, hot line communication is performed between the interchangeable lens 3 and the camera body 2 in accordance with the communication specification indicated by the third generation.

  When the interchangeable lens 3 capable of communication by hotline communication corresponding only to the communication specification indicated by the third generation is mounted on the fourth generation camera body 2, between the interchangeable lens 3 and the camera body 2, Through the same exchange of command data communication, the third generation that is the highest generation among the generations common to the interchangeable lens 3 and the camera body 2 is determined as the generation indicating the communication specifications of the hotline communication. Hot line communication is performed between the interchangeable lens 3 and the camera body 2 in accordance with the communication specification indicated by the generation.

  When the interchangeable lens 3 capable of hotline communication that supports only the communication specification indicated by the third generation is mounted on the first generation or second generation camera body 2, the interchangeable lens 3 and the camera body 2 share the same generation. Because there is no, hotline communication does not work properly. Or hotline communication is not started.

  Next, a case where the interchangeable lens 3 capable of communication by hotline communication corresponding only to the communication specification indicated by the fourth generation is mounted on the camera body 2 of each generation will be described. When the interchangeable lens 3 capable of communication by hotline communication corresponding only to the communication specification indicated by the fourth generation is attached to the fourth generation camera body 2, the first lens communication unit 38 is included in the initial communication. Then, “4” is transmitted as lens side generation information to the first body communication unit 28 by command data communication. The body control unit 27 receives the transmitted lens side generation information “4” via the first body communication unit 28. The body control unit 27 of the fourth generation camera body 2 sets the fourth generation, which is the highest generation among the generations common to the interchangeable lens 3 and the camera body 2, as the generation indicating the communication specifications of the hotline communication. decide. The body control unit 27 transmits the determined fourth generation information to the first lens communication unit 38 via the first body communication unit 28. Thereafter, hot line communication is performed between the interchangeable lens 3 and the camera body 2 in accordance with the communication specification indicated by the fourth generation.

  When the interchangeable lens 3 capable of hotline communication only corresponding to the communication specification indicated by the fourth generation is mounted on the first generation, second generation or third generation camera body 2, the interchangeable lens 3 and the camera body 2 Because there is no common generation, hotline communication does not work properly. Or hotline communication is not started.

  Also, “0” can be used as the value of generation information. When the value of the generation information is “0”, it is not used for determining the generation indicating the communication specification used in the hot line communication between the camera body 2 and the interchangeable lens 3 and starting the communication. Used to stop communication or stop hotline communication once started. Even if it is a manual focus lens that does not support autofocus, the detected focus lens position may be transmitted to the camera body 2 by hotline communication as long as the position of the focus lens can be detected. However, for example, in a manual focus lens that does not have a mechanism for detecting the position of the focus lens, it is not necessary to transmit the focus lens position from the interchangeable lens 3 to the camera body 2 in the first place, and it is necessary to perform hotline communication for transmitting the focus lens position. There is no. When it is not necessary to transmit information other than the focus lens position to the camera body 2, it is not necessary to perform hot line communication between the interchangeable lens 3 and the camera body 2. Therefore, when an interchangeable lens 3 that does not require hotline communication and is not compatible with hotline communication is attached to the camera body 2, “0” is set as the generation information value from the interchangeable lens 3 to the camera body 2. Sent. On the other hand, the camera body 2 transmits a value “0” to the interchangeable lens 3 together as a data packet indicating a command for setting hotline communication and generation information. When the interchangeable lens 3 receives the data packet “0”, the hotline communication with the camera body 2 does not start.

  Further, the camera body 2 can end the hotline communication by transmitting the generation information value “0” to the interchangeable lens 3. Hot line communication started between the camera body 2 and the interchangeable lens 3 is performed when the power switch of the camera body 2 is operated, or when the power switch is not operated for a certain period of time (both in the sleep state and the sleep state). In other words, the hotline communication may be terminated when the image reproduction mode and menu display are performed. When the hotline communication is terminated, a value “0” is transmitted from the camera body 2 to the interchangeable lens 3 as a data packet indicating a command for setting hotline communication and generation information. When the interchangeable lens 3 receives generation information values “1” to “4” from the camera body 2 by command data communication, the interchangeable lens 3 starts hotline communication, and the generation information value “0” from the camera body 2 by command data communication. When received, the hotline communication is terminated. Note that the parameter of the generation information that does not start communication or the parameter of the generation information that stops communication is not limited to “0” but may be a specific value such as “99”.

As described above, a value (integer) of “0” or more can be used as generation information. When an integer of “1” or more is transmitted from the interchangeable lens 3 as generation information to the camera body 2, the camera body 2 determines a generation indicating a communication specification communicable with the camera body 2, and the interchangeable lens 3 performs hotline communication. Is received from the camera body 2 and the generation information of “1” or more determined by the camera body 2 is started.
When “0” is transmitted as generation information from the interchangeable lens 3, the camera body 2 recognizes that the interchangeable lens 3 is an interchangeable lens that does not perform hotline communication, and the camera body 2 recognizes the interchangeable lens. 3 is transmitted with “0” as generation information. The interchangeable lens 3 does not start hot line communication by receiving a command for setting hot line communication and generation information “0” from the camera body 2. When “0” is transmitted from the interchangeable lens 3 to the camera body 2 as generation information, the camera body 2 does not transmit “0” to the interchangeable lens 3 and does not transmit a setting command for hotline communication. Also good.

Furthermore, after the interchangeable lens 3 receives a command for setting hot line communication from the camera body 2 and generation information of “1” or more determined by the camera body 2 and starts the hot line communication, the hot line communication from the camera body 2 is started. When the interchangeable lens 3 receives the command to set the generation information “0”, the interchangeable lens 3 stops the hot line communication.
When hotline communication is not performed or hotline communication once started is stopped, the interchangeable lens 3 receives a command for setting hotline communication and generation information “0” from the camera body 2. As a result, there is no need for a dedicated command to stop hotline communication. Therefore, the number of commands can be reduced. In addition, since the same command can be used to start and stop hotline communication, the control becomes simple.
Generation information is transmitted from the camera body 2 to the interchangeable lens 3 not only by transmitting generation information indicating communication specifications used for hot line communication, but also by being sent after a command for setting hot line communication. , Start hotline communication, or stop hotline communication once started.

  FIG. 9 is a diagram illustrating an example of hotline communication performed according to determination of generation information in the camera 1 that is the imaging apparatus according to the first embodiment. In FIG. 9, a case where a focus lens is driven as a lens will be described. FIG. 9A schematically shows a temporal change of the actual position (L1) in the optical axis direction of the focus lens, and FIG. 9B shows from the encoder of the lens position detection unit 34 according to the movement of the focus lens. FIG. 9C shows sampling of the pulse signal by the lens control unit 37, and FIG. 9D shows command data communication (CD1 to CD3) between the camera body 2 and the interchangeable lens 3. ) And hot line communication (HL1 to HL6), and FIG. 9E shows the position of the focus lens (pulse position) in the camera body 2 based on the integrated value (pulse position information) of the pulse signal received by hot line communication. FIG. 6 schematically shows a temporal change in the position (L2) of the focus lens when the lens is restored. In FIG. 9, the horizontal axis of (a)-(e) is a common time axis.

  A curve L1 in FIG. 9A schematically represents a temporal change in the position of the focus lens, with the horizontal axis representing time and the vertical axis representing the position of the focus lens in the optical axis L direction. FIG. 9B shows a pulse signal output from the encoder of the lens position detector 34 described above. The number of pulse signals corresponds to the amount of movement of the focus lens, and is a pulse signal that is generated every time the focus lens is driven and moved by a predetermined amount, and is frequently generated when the change in the position of the focus lens is large. That is, as the moving speed of the focus lens increases, the frequency of generation of pulse signals per unit time increases. The lens control unit 37 transmits the pulse position information of the focus lens (the position of the focus lens expressed by the integrated number of pulses) generated by integrating the pulse signals, from the interchangeable lens 3 to the camera body 2 by each hot line communication. Note that the pulse signal in FIG. 9B may be a pulse signal output from the drive circuit of the lens drive unit 33. The curve L2 in FIG. 9 (e) shows the focus reproduced by the camera body 2 based on the pulse position information received in each hotline communication, with the horizontal axis representing time and the vertical axis representing the position of the focus lens in the optical axis L direction. The time change of the position of a lens is typically expressed.

  As described above, the command data communication and the hot line communication are performed using different communication paths. In FIG. 9D, the command data communication (CD1 to CD3) and the hot line communication (HL1 to HL1) are performed. HL6). Command data communication (CD1 to CD3) is indicated by broken-line double arrows, and hot line communication (HL1 to HL6) is indicated by solid-line arrows. Command data communication is bidirectional communication between the camera body 2 and the interchangeable lens 3, and hot line communication is communication from the interchangeable lens 3 to the camera body 2.

  In the command data communication CD1, the lens control unit 37 of the interchangeable lens 3 transmits the lens side generation information of the interchangeable lens 3 to the first body communication unit 28 of the camera body 2 through the first lens communication unit 38. When the first body communication unit 28 receives the lens side generation information of the interchangeable lens 3, the body control unit 27 of the camera body 2 is based on the lens side generation information and the body side generation information of the camera body 2 itself. Thus, as described above, the generation indicating the communication specification when performing the hotline communication is determined.

In the command data communication CD2, the first body communication unit 28 transmits to the first lens communication unit 38 a command packet and a data packet that request setting of hotline communication. This data packet includes generation information indicating the communication specification determined by the body control unit 27. When the first lens communication unit 38 receives a command packet and a data packet that request setting of hotline communication, the lens control unit 37 can communicate according to the communication specification indicated by the generation information included in the data packet. In addition, processing for setting and controlling each part of the interchangeable lens 3 is performed.
In the command data communication CD2, information corresponding to a later-described shift time Δt is transmitted from the interchangeable lens 3 to the camera body 2.

As shown in FIG. 9 (c), the lens control unit 37 that has received the command packet and data packet (command data communication CD2) requesting the setting of the hotline communication receives the pulse signal from the lens position detection unit 34 at time t1. Start sampling. The lens control unit 37 samples (counts) the pulse signal, so that information on the integrated value of the pulse signal sampled within the sampling time can be generated. The second lens communication unit 39 is in a state where the integrated value (pulse position information) of the pulse signal from the origin position detected by the photo interrupter can be transmitted to the camera body 2.
The pulse signal may be sampled before time t1 and after receiving CD2, the pulse position information may be transmitted to the camera body 2 from time t1.

  The first body communication unit 28 transmits a signal (drive command) instructing driving of the focus lens to the first lens communication unit 38 as command data communication CD3. The lens control unit 37 starts moving the focus lens based on this drive command.

  As shown in FIG. 9C, the lens control unit 37 samples (counts) the pulse signal output from the lens position detection unit 34 at a sampling interval in accordance with the sampling interval specification indicated by the determined generation. . The lens control unit 37 first samples the pulse signal output from the lens position detection unit 34 from time t1 to time t2, and generates pulse position information obtained by integrating the pulse signals. Then, the lens control unit 37 samples the pulse signal output from the lens position detection unit 34 at a sampling interval corresponding to the specification of the sampling interval indicated by the generation determined after time t2. As described above, the lens control unit 37 continues sampling the pulse signal until it receives the value “0” of the generation information instructing to end the hotline communication.

  In the hotline communication HL1, the second lens communication unit 39 uses the integrated value of the pulse signal sampled between time t1 and time t2 (in the example of FIG. 9, the integrated value of the pulse signal is 1) as pulse position information. , To the second body communication unit 29.

In the hotline communication HL2, the second lens communication unit 39 includes the integrated value of pulse signals sampled from time t1 to time t2 (in the example of FIG. 9, the number of pulses is 1 pulse) and from time t2 to time t3. The pulse position information represented by the number of pulses (the number of pulses added in the example of FIG. 9 is 3 pulses in the example of FIG. 9) obtained by adding the integrated values of the pulse signals sampled between (in the example of FIG. 9 the number of pulses is 2 pulses) , To the second body communication unit 29. In the hot line communication HL3, HL4, HL5, HL6..., The second lens communication unit 39 counts the number of pulses sampled in the periods t3 to t4, t4 to t5, t5 to t6, t6 to t7. Is transmitted to the second body communication unit 29 as pulse position information represented by the number of pulses obtained by adding the number of pulses added to the number of accumulated pulses sampled before that.
In addition, each hot line communication by the 2nd lens communication part 39 and the 2nd body communication part 29 is performed by the communication speed and communication interval of the communication specification which the generation determined by the body control part 27 as mentioned above shows. In this embodiment, the communication speed is 2.5 MHz and the communication interval is 1 msec. That is, HL1, HL2, HL3, HL4, HL5, HL6... Are transmitted from the lens control unit 37 to the body control unit 27 in synchronization with a clock frequency of 2.5 MHz every 1 msec.

As described above, the interval from time t1 to time t2, the interval from time t2 to time t3, the interval from time t3 to time t4, the interval from time t4 to time t5, the interval from time t5 to time t6, The interval from time t6 to time t7 is the sampling interval specified by the sampling interval indicated by the determined generation.
In addition, the interval between the hot line communications HL1 to HL2, the interval between the hot line communications HL2 to HL3, the interval between the hot line communications HL3 to HL4, the interval between the hot line communications HL4 to HL5, and the interval between the hot line communications HL5 to HL6 are respectively This is the communication interval of the communication specification indicated by the determined generation. In the present embodiment, the sampling interval and the communication interval are the same time interval. Of course, the sampling interval and the communication interval may be different from each other. For example, the communication interval may be twice as long as the sampling interval.

  The pulse position information represented by the accumulated number of pulse signals repeatedly received by the second body communication unit 29 at every communication interval is sequentially stored in the body memory 22 of the camera body 2. The transfer of the pulse position information to the body memory 22 is performed by, for example, DMA (Direct Memory Access). The body control unit 27 stores the pulse position information stored in the body memory 22 at an arbitrary timing (for example, the timing at which the vertical synchronization signal of the image sensor is output; in FIG. 9, the time ta between the time t6 and the time t7). , The time (time t2 to t6 on the interchangeable lens side) when each pulse position information is generated in the interchangeable lens 3 is calculated by a method described later. The body control unit 27 associates each pulse position information with the generation time of the pulse position information, thereby grasping the position of the focus lens at each time as shown by a curve L2 in FIG. To do. Note that the position information repeatedly received at each communication interval by the second body communication unit 29 is not limited to the pulse position information represented by the integrated number of pulse signals, and the lens control unit 37 of the interchangeable lens 3 performs sampling within the sampling period. The second body communication unit 29 may receive the pulse signal, and the body control unit 27 may integrate the pulse signal to generate lens pulse position information.

  The pulse position information associated with the generation time is used for the phase difference AF described above, for example. The body control unit 27 calculates the defocus amount using the focus detection signal output from the image sensor 21 as described above. The body control unit 27 generates a signal for instructing driving of the focus lens based on the calculated defocus amount, and outputs the generated drive instruction signal (drive command) to the lens control unit 37 by command data communication. The lens control unit 37 controls driving of the focus lens and transmits pulse position information to the body control unit 27. The body control unit 27 grasps the position of the focus lens at each time based on the pulse position information, and how far the focus lens has moved with respect to the movement amount (defocus amount) of the focus lens instructed to the lens control unit 37. Confirm.

  Further, the pulse position information associated with the generation time can be used for the above-described contrast AF. The body control unit 27 associates the pulse position information of the focus lens with the contrast evaluation value based on the generation time of the pulse position information and the generation time of the signal of the image sensor 21 used to calculate the contrast evaluation value. . Accordingly, the body control unit 27 can grasp the position of the focus lens and the contrast evaluation value at each time. The body control unit 27 calculates the pulse position of the focus lens at which the contrast evaluation value reaches a peak as the in-focus position. The body control unit 27 generates a signal for instructing driving of the focus lens based on the calculated in-focus position, and outputs the generated drive instruction signal (drive command) to the lens control unit 37 by command data communication. The lens control unit 37 performs drive control for moving the focus lens to the in-focus position, and performs focus adjustment.

  Here, regarding the lens position that the camera body 2 restores and generates, a shift that may occur due to the difference in clock timing between the camera body 2 and the interchangeable lens 3 will be described. The camera body 2 and the interchangeable lens 3 operate using separate clocks. That is, the camera body 2 generates a clock used by the camera body itself in the camera body 2, and the interchangeable lens 3 independently generates a clock used by the interchangeable lens itself in the interchangeable lens 3. The frequency of the clock in the camera body 2 and the frequency of the clock in the interchangeable lens 3 may be the same or different. If the camera body 2 and the interchangeable lens 3 generate a clock having the same frequency and the clock timing (rising and falling) is completely synchronized, the camera body 2 detects the signal generated by the interchangeable lens 3. The generation time can be grasped. However, when the clock timing of the camera body 2 and the interchangeable lens 3, that is, the clock frequency or the rising / falling timing of the clock is different, the camera body 2 cannot accurately grasp the time when the interchangeable lens 3 generated the signal. There is a time lag between the position of the lens and the position of the lens that is restored and generated by the camera body 2.

  In the following, when the clock timings of the camera body 2 and the interchangeable lens 3 are different, the time when the camera body 2 generates the pulse position information (the integrated value of the pulse signal) (time t2 to t6 on the interchangeable lens side). ) Will be described. As described above with reference to FIGS. 9B to 9D, the pulse position information is generated by the lens control unit 37 by sampling the pulse signal from the lens position detection unit 34 or the lens driving unit 33 at a predetermined cycle. Is done. The sampling of the pulse signal by the lens control unit 37 is performed according to a clock signal (hereinafter referred to as a lens clock signal) used inside the interchangeable lens 3. That is, in FIG. 9, the times t2, t3, t4, t5, t6, t7,... At which the pulse signal is sampled and the integrated value of the pulse signal is generated are synchronized with the rise or fall of the lens clock signal. It will be the timing. This lens clock signal is a clock signal different from the CLK signal supplied from the camera body 2.

  For example, the body control unit 27 grasps the time when the sampling of the pulse signal is started with reference to the time when the command data communication CD2 for setting the hotline communication is performed. In order for the body control unit 27 to grasp the generation time of the integrated value of the pulse signal by the lens control unit 37 with reference to the time of the command data communication CD2, the lens control unit 37 uses the method described later to determine the time of the command data communication CD2. To the time from the start of sampling of the pulse signal to time t1 (shift time Δt shown in FIG. 9D) is calculated. The lens control unit 37 transmits information corresponding to the calculated deviation time Δt to the camera body 2 by command data communication CD2.

  The body control unit 27 of the camera body 2 acquires information corresponding to the shift time Δt from the interchangeable lens 3 and uses the shift time Δt to obtain pulse position information that is an integrated value of the pulse signal from the transmission time of the command data communication CD2. The generation time of is calculated. Thus, the body control unit 27 calculates the generation time of the pulse position information based on the transmission time of the command data communication CD2.

  FIG. 10 is a diagram for explaining an example of a method for calculating the shift time Δt in the imaging apparatus according to the first embodiment. Note that time t-1, time t0, time t1, and time t2 in FIG. 10 correspond to time t-1, time t0, time t1, and time t2 in FIG. 9, respectively. The command packet 44 and the data packet 45 are a command packet and a data packet transmitted from the camera body 2 to the interchangeable lens 3 by the command data communication CD2 shown in FIG. The command packet 44 is a signal for instructing setting of hotline communication, and the data packet 45 is a signal including generation information determined by the camera body 2.

  The trigger signal for latching the pulse signals shown at times t-1, t1, and t2 in FIG. 10 is a trigger that is repeatedly generated at a predetermined cycle S based on the lens clock signal output from the lens control unit 37 of the interchangeable lens 3. Signal. The predetermined period S is the sampling interval in FIG. 9C, and this interval is the sampling interval described in FIG. 6, and is indicated by generation information. The lens control unit 37 samples (latches) the pulse signal from the lens position detection unit 34 or the lens driving unit 33 at the sampling interval S using the trigger signal.

  Here, a method for calculating the shift time Δt will be described. As a premise, when the interchangeable lens 3 is attached to the camera body 2 and power supply is started from the camera body 2, the lens control unit 37 latches the pulse signal at the sampling interval S according to the specification that it can handle. . In FIG. 10, the time after time t-1 of the latch immediately before the command data communication CD2 is performed is shown. The lens control unit 37 normally receives the command packet 44 of the command data communication CD2 and sets the RDY signal to high level, and then sets the RDY signal to low level at time t0. The lens control unit 37 detects the time from time t-1 to time t0, and subtracts the time from time t-1 to time t0 from the period S from time t-1 to time t1. Time Δt is calculated. Specifically, the lens control unit 37 counts (counts) the lens clock signal during a period from the time t-1 to the falling edge of the RDY signal by an internal counter circuit or the like, so that the time t−1. The time from to t0 is detected. Then, the lens control unit 37 outputs information indicating the shift time Δt to the body control unit 27 by the command data communication CD2.

  In addition, when receiving the data packet 45, the lens control unit 37 changes the RDY signal from the low level to the high level. As described above, the data packet 45 includes generation information, and the lens control unit 37 starts hot line communication according to the communication specification indicated by the generation determined by the camera body 2. In addition, the lens control unit 37 generates a trigger signal at a sampling interval S corresponding to the specification of the sampling interval indicated by the determined generation, and performs sampling processing of the pulse signal (see FIG. 9). The lens control unit 37 counts the pulse signals of the lens position detection unit 34 or the lens driving unit 33 that are generated during the interval S from time t1 to time t2. The number of sampled pulse signals is transmitted from the interchangeable lens 3 to the camera body 2 in the hotline communication HL1 in FIG.

  The body control unit 27 acquires information indicating the shift time Δt from the lens control unit 37 through the command data communication CD2. Based on the deviation time Δt and the sampling interval S, the body control unit 27 calculates the generation time of the pulse position information, that is, the time when the pulse signal output from the encoder of the lens position detection unit 34 or the lens driving unit 33 is sampled. To do. For example, the body control unit 27 calculates (determines) the time t0 + Δt + S obtained by adding the shift time Δt and the sampling interval S to the falling time t0 of the RDY signal as the generation time t2 of the pulse position information. The body control unit 27 calculates the generation times t3, t4, t5, and t6 of the pulse position information as t2 + S, t2 + 2S, t2 + 3S, and t2 + 4S, respectively.

  In the present embodiment, the camera body 2 acquires the shift time Δt related to the time at which the pulse position information obtained by integrating the pulse signals is generated, and calculates the position information of the focus lens using the shift time Δt. For this reason, the time delay between the position of the focus lens calculated and restored by the camera body 2 and the actual position of the focus lens in the interchangeable lens 3 can be reduced. Hereinafter, the fact that the time delay between the restored focus lens position and the actual focus lens position is reduced (the shift time Δt that is the cause of the delay is canceled) will be described in comparison with the comparative example. To do.

  In the comparative example, the position of the focus lens is calculated without obtaining an accurate shift time Δt. Since there is no accurate shift time Δt from the lens control unit 37, the body control unit 27 calculates the generation time of the lens position information using a fixed value corresponding to the shift time instead. However, since the lens position information is generated using a trigger signal (a signal based on the lens clock signal used inside the interchangeable lens 3) that is asynchronous with the clock signal (CLK signal) from the camera body 2, there is a deviation. The time changes according to the timing at which a command instructing the setting of hot line communication is transmitted from the camera body 2 (in the embodiment shown in FIG. 10, the falling timing of the RDY signal). As a result, if the shift time is set to a fixed value, an error occurs when the pulse position information is associated with the generation time, and a difference between the actual position of the focus lens and the calculated position occurs. A hot line communication clock signal (HCLK signal) is generated based on the lens clock signal and is output from the interchangeable lens 3 to the camera body 2.

  In this embodiment, since the position of the focus lens is restored by using the shift time Δt between the timing at which the command signal is transmitted and the timing at which the lens control unit 37 actually measures (sampling) the pulse signal, the restoration is performed. A time lag between the position of the focus lens and the actual position of the focus lens is reduced. As a result, for example, it is possible to suppress the occurrence of an error when determining the position of the focus lens as the focus position by autofocus.

According to the embodiment described above, the following operational effects can be obtained.
(1) Generation information indicating the communication specifications of hotline communication is transmitted from the interchangeable lens 3 to the camera body 2 by command data communication. Since it did in this way, the camera body 2 can grasp | ascertain the communication specifications (communication speed etc.) which the interchangeable lens 3 can support by referring the generation information transmitted by command data communication from the interchangeable lens 3. . Therefore, appropriate communication can be performed between the camera body 2 and the interchangeable lens 3. Also, by hotline communication such as communication speed and communication interval data, focus lens drive information (focus lens position information, etc.) and anti-vibration lens drive information (vibration lens position information, etc.) Compared to the case where the data to be transmitted is individually sent from the interchangeable lens 3 to the camera body 2, the amount of data transmitted from the interchangeable lens 3 to the camera body 2 can be reduced, and the communication specifications performed between the interchangeable lens 3 and the camera body 2 It is possible to shorten the communication time and the number of communication times for determining. Here, the number of values of generation information is smaller than the number of communication specifications and all combinations of data indicated by generation information. In addition, when the communication specifications (communication speed, communication interval, etc.) indicated by the generation information and the sampling interval specifications are individually transmitted from the interchangeable lens 3 to the camera body 2, the camera body 2 checks whether there is any contradiction in the individual information. It is necessary to confirm with. In this embodiment, communication specifications (communication speed, communication interval, etc.) that do not contradict each other, and specifications for sampling intervals are set and stored as generation information indicating these specifications. It is not necessary to confirm whether there is no contradiction in 2.
Further, according to the communication specification indicated by the generation determined by the camera body 2, the interchangeable lens 3 uses hotline information (lens position information) about the driven member (focus lens or the like) generated by the generation unit (lens control unit 37). It transmits to the camera body 2 by communication. Therefore, the position information of the focus lens, which is a driven member, can be transmitted from the interchangeable lens 3 to the camera body 2 at high speed using hot line communication, so that the autofocus operation is speeded up.

(2) The interchangeable lens 3 repeatedly generates information (lens pulse position information) on the driven member (focus lens, etc.), transmits the information to the camera body 2, and instructs the camera body 2 to start communication. A lens control unit 37 is provided that calculates a shift time Δt from when the signal is received until the lens control unit 37 generates information about the driven member, and transmits the shift time Δt to the camera body 2. Since it did in this way, the camera body 2 can grasp | ascertain the position of the focus lens in each time using the pulse position information of lens, and shift | offset | difference time (DELTA) t. In the present embodiment, the camera body 2 restores and generates the focus lens position using the shift time Δt. For this reason, an error between the position of the focus lens restored by the camera body 2 and the actual position of the focus lens in the interchangeable lens 3 can be reduced.

(3) With respect to the CLK terminal and the GND terminal, the CLK terminal is disposed at a position farther from the VBAT terminal than the GND terminal. Further, a PGND terminal is disposed between the GND terminal and the VBAT terminal. As a result, noise caused by the VBAT terminal to the CLK terminal to which the clock signal used for command data communication is sent can be shielded, so that command data communication can be performed stably. Therefore, generation information can be reliably transmitted and received between the camera body 2 and the interchangeable lens 3.

  The following modifications are also within the scope of the present invention, and one or a plurality of modifications can be combined with the above-described embodiment.

(Modification 1)
In the above-described embodiment, an example in which full-duplex communication is performed as command data communication between the first lens communication unit 38 and the first body communication unit 28 has been described. However, the first lens communication unit 38 and the first body communication unit 28 may perform half-duplex communication as command data communication.

(Modification 2)
In the above-described embodiment, the lens control unit 37 calculates the time from time t0 to time t1 in FIG. 10 as the shift time Δt, and the body control unit 27 calculates the shift time Δt calculated by the lens control unit 37. The example in which the generation time of the lens position information is calculated using the above has been described. However, the lens control unit 37 may calculate a time (shift time Δt2) from time t0 to time t2 in FIG. 10 and output the shift time Δt2 to the camera body 2. In this case, the body control unit 27 calculates the generation time of the lens position information using the shift time Δt2.

  For example, the body control unit 27 calculates (determines) the time t0 + Δt2 obtained by adding the shift time Δt2 to the falling time t0 of the RDY signal as the generation time t2 of the lens position information. The body control unit 27 calculates the lens position information generation times t3, t4, t5, and t6 as t2 + S, t2 + 2S, t2 + 3S, and t2 + 4S, respectively.

(Modification 3)
In the above-described embodiment, the lens control unit 37 includes the first lens communication unit 38 and the second lens communication unit 39. However, the lens control unit 37 may be performed by one lens communication unit without providing these separately. . Moreover, although the body control part 27 had the 1st body communication part 28 and the 2nd body communication part 29, you may perform by one body communication part, without providing these separately.

(Modification 4)
In the above embodiment, the interchangeable lens of the camera has been described as an example as an accessory, but the accessory is not limited to the interchangeable lens. For example, a teleconverter, a wide converter, or a close-up ring that is mounted between the camera body and the interchangeable lens and changes the focal length of the interchangeable lens may be used. Or it is applicable also to the mount adapter etc. which can mount | wear with the accessory containing the interchangeable lens of another mount standard in the mount standard of the camera body mentioned above. That is, any accessory can be used as long as it is attached to the mount of the camera body. In this case, the lens side terminal group, the lens side claw portion 139, the first and second lens communication portions 38, 39, and the like correspond to the accessory side terminal group, the accessory side protruding portion, the accessory side communication portion, and the like of each accessory. .
In the above-described embodiment, the accessory that can be attached to the camera body is used. However, the camera body is a mount adapter that allows an interchangeable lens of the mount standard described above to be attached to a camera body different from the mount standard described above. Alternatively, the above-described accessory may be attached to the mount adapter.

(Modification 5)
In the embodiment described above, the interchangeable lens 3 transmits information to the camera body 2 at the communication interval of the communication specification indicated by the determined generation. However, the interchangeable lens 3 does not necessarily transmit data at every communication interval of the communication specification indicated by the determined generation. The communication interval of the communication specification indicated by the determined generation, for example, the communication interval sent by the interchangeable lens 3 may be a communication interval twice the communication interval of the communication specification indicated by the determined generation. In that case, the camera body 2 can receive all the data sent from the interchangeable lens 3 at an interval twice the communication interval of the communication specification indicated by the determined generation. Of course, if the generated data is synchronized with the communication interval of the communication specification indicated by the determined generation, instead of every double communication interval, the data may be transmitted not periodically but irregularly. In addition, the communication interval at which the interchangeable lens 3 transmits data may be a communication interval that is three times the communication interval of the communication specification indicated by the determined generation.

  Although various embodiments and modifications have been described above, the present invention is not limited to these contents. You may combine the above-mentioned embodiment and modification. Furthermore, other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Camera (camera system), 2 ... Camera body, 3 ... Interchangeable lens, 27 ... Body control part, 28 ... 1st body communication part, 29 ... 2nd body communication part, 37 ... Lens control part, 38 ... 1st Lens communication unit, 39 ... second lens communication unit

Claims (8)

An accessory that can be attached to the camera body and can communicate with the camera body,
A first transmission unit capable of transmitting a plurality of information related to the driven member driven by the drive unit to the camera body;
A receiving unit that receives from the camera body a first value indicating that a plurality of pieces of information about the driven member are transmitted to the camera body;
With
The first transmission unit, accessory to send a plurality of information on the previous SL driven member to the camera body. The accessory according to claim 1, wherein
The first value is an accessory indicating that information on a state of the driven member and a position of the driven member is transmitted to the camera body as a plurality of pieces of information on the driven member . The accessory according to claim 1 or 2,
The first value is a plurality of pieces of information related to the driven member, and two or more pieces of information related to the focus lens, information related to the vibration proof lens, information related to the zoom lens, and information related to the aperture stop are transmitted to the camera body. Accessories that indicate that An accessory that can be attached to the camera body and can communicate with the camera body,
A first transmission unit information about the driven member can be transmitted to the camera body which is driven by the drive unit,
A second transmitter that transmits to the camera body a first value indicating that first information about the driven member is transmitted to the camera body by the first transmitter;
A receiving unit that receives from the camera body a second value indicating that second information related to the driven member is transmitted to the camera body by the first transmitting unit ;
With
The first transmission unit is an accessory that transmits the second information to the camera body when the first value and the second value are different. An accessory that can be attached to the camera body and can communicate with the camera body,
A first transmission unit information about the driven member can be transmitted to the camera body which is driven by the drive unit,
A second transmitter that transmits to the camera body a first value indicating that first information about the driven member is transmitted to the camera body by the first transmitter;
A receiving unit that receives from the camera body a second value indicating that second information related to the driven member is transmitted to the camera body by the first transmitting unit ;
With
The first transmission unit is an accessory that transmits the first information or the second information to the camera body when the first value and the second value are the same. The accessory according to claim 4 or 5 ,
The first value indicates that at least one of the state of the driven member and the position of the driven member is transmitted to the camera body as the first information,
The second value is an accessory indicating that at least one of the state of the driven member and the position of the driven member is transmitted to the camera body as the second information. The accessory according to any one of claims 4 to 6,
The first value indicates that at least one of information relating to a focus lens, information relating to an anti-vibration lens, information relating to a zoom lens, and information relating to an aperture stop is transmitted to the camera body as the first information. Show
The second value indicates that, as the second information, at least one of information on a focus lens, information on an anti-vibration lens, information on a zoom lens, and information on an aperture stop is transmitted to the camera body. Accessories shown. The accessory according to any one of claims 4 to 7,
The first transmission unit includes a generation unit that generates information about the driven member that is transmitted to the camera body,
The first value and the second value are accessories indicating that a time interval for generating information on the driven member by the generation unit is transmitted to the camera body.

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