JP2014219698A - Interchangeable lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interchangeable lens that enables an appropriate lens control.SOLUTION: The interchangeable lens comprises: mounting means to which a camera body can be mounted; communication means that communicates with the camera body; a driven member; control means that controls the driven member; and storage means that stores lens data relating to a control of the driven member by the control means. When receiving driving amount information and driving velocity information relating to the driven member from the camera body via the communication means, the control means transmits lens side determination data capable of determining whether or not the lens data is deemed to be correctly stored in the storage means on a camera body side to the camera body via the communication means.

Description

  The present invention relates to an interchangeable lens.

  2. Description of the Related Art Conventionally, an interchangeable lens capable of calculating a diaphragm driving time in a so-called single-lens reflex camera system is known. For example, Patent Document 1 describes a configuration in which a lens microcomputer in an interchangeable lens calculates an aperture driving time from aperture speed information stored in advance in an internal memory and drive amount information received from a camera microcomputer. Has been.

JP 2006-208897 A

  In the prior art, there is only a viewpoint that information (lens data) stored in advance in a storage medium (for example, the above-described internal memory) in the interchangeable lens is stored correctly, and the lens data is not stored correctly. No assumption has been made about the assumption (for example, the assumption that the lens data is damaged by a strong electric shock or the like).

The interchangeable lens according to claim 1, wherein the camera body can be attached to a mounting means, a communication means for communicating with the camera body, a driven member, a control means for controlling the driven member, and the control Storage means for storing lens data related to control of the driven member by means, and the control means sends drive amount information and driving speed information about the driven member from the camera body via the communication means. Upon reception, lens side determination data capable of determining on the camera body side whether or not the lens data is correctly stored in the storage means is transmitted to the camera body via the communication means. To do.
The interchangeable lens according to claim 2 is provided with an attachment means to which a camera body can be attached, a communication means for communicating with the camera body, a driven member, a control means for controlling the driven member, and the control Storage means for storing lens data related to control of the driven member by means, and the control means sends drive amount information and driving speed information about the driven member from the camera body via the communication means. Upon receipt, lens side determination data that allows the camera body to determine whether or not the lens data stored in the storage means can be used is transmitted to the camera body via the communication means.
The interchangeable lens according to claim 3 is a mounting means to which a camera body can be attached, a communication means for communicating with the camera body, a driven member, a control means for controlling the driven member, and the control Storage means for storing lens data related to control of the driven member by means, and the control means sends drive amount information and driving speed information about the driven member from the camera body via the communication means. Upon receipt, lens side determination data that can be determined on the camera body side whether or not it matches the data acquired in the camera body is transmitted to the camera body via the communication means.

  According to the present invention, appropriate lens control can be performed.

It is a perspective view which shows the structure of the camera system which concerns on 1st Embodiment. It is typical sectional drawing of the camera body 100 and the 1st interchangeable lens 200a. It is typical sectional drawing of the camera body 100 and the 2nd interchangeable lens 200b. It is typical sectional drawing of the camera body 100 and the 3rd interchangeable lens 200c. It is a flowchart of the initialization process which the body control apparatus 109 performs. It is a flowchart of the initialization process which the 1st lens control apparatus 209a performs. It is a flowchart of the imaging | photography process which the body control apparatus 109 performs in 1st control mode. It is a flowchart of the imaging | photography process which the 1st lens control apparatus 209a performs in 1st control mode. It is a flowchart of the initialization process which the body control apparatus 109 which concerns on 2nd Embodiment performs. It is a flowchart of the initialization process which the 1st lens control apparatus 209a which concerns on 2nd Embodiment performs. It is a flowchart of the initialization process which the body control apparatus 109 which concerns on 3rd Embodiment performs. It is a flowchart of the initialization process which the 1st lens control apparatus 209a which concerns on 3rd Embodiment performs. It is a flowchart of the initialization process which the body control apparatus 109 which concerns on 4th Embodiment performs. It is a flowchart of the initialization process which the 1st lens control apparatus 209a which concerns on 3rd Embodiment performs. It is a figure which shows the memory content of the body side ROM which concerns on a modification. It is a flowchart of the initialization process which the body control apparatus 109 which concerns on a modification performs.

(First embodiment)
Hereinafter, a camera system according to a first embodiment to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a camera system according to the first embodiment. The digital camera system shown in FIG. 1 includes a camera body 100 and a first interchangeable lens 200a that can be attached to the camera body 100. In addition to the first interchangeable lens 200a, the second interchangeable lens 200b and the third interchangeable lens 200c can be attached to the camera body 100. Differences between these three types of interchangeable lenses 200a, 200b, and 200c will be described in detail later.

  The camera body 100 includes a so-called bayonet-type body-side mount portion 101. When the lens side mount portion 201 of the first interchangeable lens 200 a is fitted and fixed to the body side mount portion 101, a plurality of electrical contacts 202 provided on the lens side mount portion 201 are replaced with a plurality of electrical contacts 202 provided on the body side mount portion 101. It is electrically connected to the electrical contact 102. In addition, the camera body 100 is provided with a release switch 120 that can be pressed halfway and fully.

(Description of Digital Camera System with Camera Body 100 and First Interchangeable Lens 200a)
FIG. 2 is a schematic cross-sectional view of the camera body 100 and the first interchangeable lens 200a. The first interchangeable lens 200a has an imaging optical system that receives a light beam from a subject and forms a subject image on an imaging surface. This imaging optical system includes a plurality of lenses 203, 204, 205 and a diaphragm 206. Among these, the lens 204 is a focusing lens that can move in the direction of the optical axis X. The camera body 100 includes an image sensor 104 that captures a subject image formed by the imaging optical system, converts the subject image into an electrical signal, and outputs the electrical signal. The image sensor 104 is a solid-state image sensor such as a CCD or CMOS. Although omitted in FIG. 2, an infrared cut filter for cutting infrared light, an optical low-pass filter for preventing image aliasing noise, and the like are arranged on the imaging surface of the image sensor 104. Yes.

  A quick return mirror 103 is disposed on the optical path of the light beam that has passed through the imaging optical system in the camera body 100 so as to block the image sensor 104. The quick return mirror 103 is in a position indicated by a solid line in FIG. 2 before exposure (when not photographing), and reflects the subject light from the imaging optical system toward the finder screen 107 disposed on the upper part of the camera body 100. . The viewfinder screen 107 is disposed at a position conjugate with the image pickup element 104 with respect to the quick return mirror 103.

  The subject light reflected by the reflection surface of the quick return mirror 103 is transmitted through the finder screen 107, introduced into the pentaprism 108 (pentagonal roof prism), and emitted toward the eyepiece lens 110. Therefore, the photographer can visually recognize the subject image through the eyepiece 110 in the pre-exposure state.

  Near the center of the quick return mirror 103 (near the optical axis X of the optical system) is a half mirror, and part of the subject light passes through this half mirror. This transmitted light beam is reflected by the sub-mirror 105 provided on the back surface of the quick return mirror 103 and enters the focus detection device 106 provided at the lower part of the camera body 100. The focus detection device 106 detects the focus adjustment state of the imaging optical system.

  At the time of exposure, the quick return mirror 103 and the sub mirror 105 move to the lower part (retracted position) of the finder screen 107. When the quick return mirror 103 and the sub mirror 105 move to the retracted position, the subject light transmitted through the imaging optical system is introduced into the image sensor 104. Thereafter, the image sensor 104 captures a subject image formed on the imaging surface.

  The first interchangeable lens 200a includes a first lens control device 209a that controls each part of the first interchangeable lens 200a. The camera body 100 includes a body control device 109 that controls each part of the camera body 100. The first lens control device 209a and the body control device 109 transmit and receive an electrical signal via a plurality of electrical contacts 102 and 202 provided on the mount portions on the camera body side and the interchangeable lens side, respectively. Data communication can be performed.

  The first interchangeable lens 200a includes a lens driving unit 207 that drives the focusing lens 204 in a direction along the optical axis X, and an aperture driving unit that drives the diaphragm 206 so as to change the size of the aperture through which subject light passes. 208. The lens driving unit 207 and the aperture driving unit 208 are each provided with an actuator (not shown) (for example, a stepping motor), and the focusing lens 204 and the driving amount and the driving direction given from the first lens control device 209a The diaphragm 206 is driven.

  The camera body 100 includes an in-body diaphragm drive unit 111 having an actuator (not shown). When an interchangeable lens (which will be described later) that does not include a drive mechanism for the diaphragm 206 is attached, the in-body diaphragm drive unit 111 transmits the driving force of the actuator to the diaphragm 206 in the interchangeable lens, and drives the diaphragm 206. . Since the first interchangeable lens 200a shown in FIG. 2 includes the diaphragm drive unit 208, the in-body diaphragm drive unit 111 does nothing when the first interchangeable lens 200a is attached.

  The first interchangeable lens 200a includes a ROM 210 that is a nonvolatile storage medium. The lens ROM 210 stores lens data (detailed later) relating to driving of the diaphragm 206. Similarly, the camera body 100 includes a body-side ROM 112 that is a nonvolatile storage medium. The body-side ROM 112 stores in advance body-side determination data (body-side data) (described in detail later) for determining that lens data is correctly stored in a lens-side ROM 210 described later.

  The first lens control device 209a determines whether or not the lens data is correctly stored in the lens ROM 210 based on lens data (details will be described later) stored in the lens ROM 210 (body body). Lens side determination data that can be determined by the control device 109) is transmitted to the body control device 109. The body control device 109 compares the body-side determination data (body-side data) stored in the body-side ROM 112 with the received lens-side determination data, so that the lens data is correctly stored in the lens-side ROM 210. It is determined whether or not. This determination will be described later in detail.

(Explanation of aperture drive)
Before the interchangeable lens 200 starts control of aperture driving, the body control device 109 first determines what kind of interchangeable lens (the interchangeable lens type) the interchangeable lens attached to the body side mount unit 101 is. This is recognized by initial communication with the interchangeable lens 200 via the electrical contacts 102 and 202 described above. Whether the body control device 109 is the first interchangeable lens 200a or the second interchangeable lens 200b based on the contents of the lens data acquired from the interchangeable lens 200 side by initial communication (or whether or not lens data is acquired). Or the third interchangeable lens 200c.

  In the first embodiment, the following explanation will be given for the case where the first interchangeable lens 200a is first attached to the body side mount portion 101 (and identified by the body side control device 109).

  When it is necessary to change the aperture diameter of the aperture 206, for example, during exposure, the body control device 109 sends an aperture drive command to the first lens control device 209a by data communication via the plurality of electrical contacts 102, 202. Send. When the first lens control device 209a receives the aperture drive command from the body control device 109, the first lens control device 209a controls the aperture drive unit 208 according to the parameter of the aperture drive command, and causes the aperture drive unit 208 to drive the aperture 206.

  The aperture drive command includes parameters representing the drive amount, drive direction, and drive speed of the aperture 206. For example, it is assumed that the current aperture diameter of the diaphragm 206 is a size corresponding to F2, and it is desired to change this to a size corresponding to F4. In this case, the body control device 109 transmits to the first lens control device 209a an aperture drive command that sets the drive amount to “two steps”, the drive direction to the “squeezing direction”, and the drive speed to “maximum speed”. Here, when the lens control device 209a of the interchangeable lens 200a receives an aperture drive command for setting the drive speed to “maximum speed” from the body control device 109, the interchangeable lens 200a itself (the aperture drive unit 208 itself) is driven. The diaphragm 206 is driven and controlled to the target diaphragm position (driving amount) at the maximum diaphragm driving speed capable of achieving the above.

  When the driving amount of the diaphragm 206 is defined as “the number of narrowing stages from the open F value”, the parameter indicating the “driving direction” independently of the “driving amount” is set as the “diaphragm driving command”. Need not be included.

  The body control device 109 normally designates “highest speed” as the driving speed of the diaphragm 206. On the other hand, (1) when it is desired to reduce the power consumption of the first interchangeable lens 200a, (2) when it is desired to reduce the operation sound of the first interchangeable lens 200a, and (3) when the diaphragm 206 is driven during moving image shooting. , The body control device 109 transmits to the first lens control device 209a an aperture drive command that specifies a value other than “highest speed” as the drive speed.

  “(1) When the power consumption of the first interchangeable lens 200a is to be suppressed” is, for example, when the remaining battery level is low or when the user instructs a power saving operation. “(2) When it is desired to reduce the operation sound of the first interchangeable lens 200a” is, for example, a case where voice recording is performed in parallel with photographing, or a case where the user instructs a silent operation. “(3) When the diaphragm 206 is driven during moving image shooting” refers to a case where the user instructs shooting of such a moving image.

  The body control device 109 transmits an aperture drive time prediction command to the first lens control device 209a before transmitting the aperture drive command as described above.

  Here, the “aperture driving time prediction command” output from the camera body 100 side to the interchangeable lens 200 side will be described. The aperture drive time prediction command is used to drive the aperture 206 to the aperture drive unit 208 on the interchangeable lens 200 side at the aperture drive speed (number of steps) specified from the camera body 100 side at the aperture drive speed also specified from the camera body 100 side. In this case, the driving time required for the interchangeable lens 200 (first lens control device 209a) is predicted (for example, prediction calculation), and the prediction (for example, prediction calculation) result is calculated on the camera body 100 side. This is a command to output (send) to.

  When the camera body side (body control device 109) receives this prediction result (predicted driving time of the aperture), the predicted driving time is used for timing control related to the photographing operation, for example, timing control related to the exposure processing. Timing control related to exposure processing includes, for example, shutter opening / closing timing control in still image shooting, and exposure change does not occur even if the aperture value (aperture aperture size) is changed during moving image shooting (the exposure amount is constant). There is a timing control of imaging sensitivity when the imaging sensitivity is changed according to the movement of the aperture.

  When the first lens control device 209a receives the aperture drive time prediction command from the body control device 109, based on the contents of the aperture drive time prediction command (including at least the aperture drive amount a and the aperture drive speed v), The time required for driving the diaphragm 206 is predicted (calculated). Then, the first lens control device 209a transmits (replies) the predicted (calculated) driving time to the body control device 109.

The first lens control device 209a predicts the driving time based on the lens data stored in the lens side ROM 210. Here, the lens data of the lens ROM 210 will be described. The lens-side ROM 210 includes an arithmetic expression for calculating the predicted drive time T from the above-described aperture drive amount a and aperture drive speed v as lens data. An example of the calculation formula is shown in the following formula (1).
T = a / v + α (1)

  Here, α is a correction term for the aperture driving time, for example, a delay time from the start of driving control of the aperture 206 to the actual driving of the aperture 206, or the aperture after driving the aperture 206 by a target driving amount. It is determined in consideration of the time until 206 is stationary and stable. The correction term α stores a different value for each interchangeable lens. Depending on the type of interchangeable lens, different values may be stored depending on the lens setting conditions (for example, depending on the focal length in the case of a zoom lens). The lens data in the lens-side ROM 210 also includes the value of the correction term α, and this value is determined when the first interchangeable lens 200a is designed. For example, if the aperture drive amount a is “2 steps”, the aperture drive speed v is “10 steps / second”, and the correction term α is “0.1 seconds”, the first lens control is performed by the above equation (1). The device 209a predicts the predicted drive time T as 0.3 seconds. A plurality of the correction terms α may be stored (provided) according to the driving speed and the driving amount (the number of stages).

  The body control device 109 controls the release timing in still image shooting based on the predicted driving time T predicted as described above.

(Description of Digital Camera System with Camera Body 100 and Second Interchangeable Lens 200b)
FIG. 3 is a schematic cross-sectional view of the camera body 100 and the second interchangeable lens 200b. Hereinafter, the difference of the second interchangeable lens 200b from the first interchangeable lens 200a will be described.

  The second interchangeable lens 200b includes a second lens control device 209b instead of the first lens control device 209a.

  First, the body control device 109 performs initial communication with the second lens control device 209b via the electrical contacts 102 and 202 described above, and the second exchange is performed on the body side mount unit 101 based on the communication result. It is identified that the lens 200b is attached.

  Unlike the first lens control device 209a, the second lens control device 209b does not support designation of the driving speed of the diaphragm 206. For this reason, the body control device 109 outputs a second aperture drive command whose content is different from that described above (the aperture drive command sent to the first lens control device 209a), that is, a second aperture drive command whose content does not include the aperture drive speed. To the lens control device 209b.

  When the second lens control device 209b receives the aperture drive command transmitted from the body control device 109, the second lens control device 209b controls the aperture drive unit 208 according to the content of the aperture drive command, similarly to the first lens control device 209a, The diaphragm driving unit 208 drives the diaphragm 206. However, since this is an aperture drive command that does not include the designation of the aperture drive speed, when the second interchangeable lens 200b is attached to the camera body 100, the aperture 206 is always at a predetermined speed (for example, the maximum speed that the second interchangeable lens 200b can output). It will be driven by.

  Furthermore, the second lens control device 209b does not support prediction (calculation) of the driving time of the diaphragm 206, which is performed by the above-described first interchangeable lens 200a. The second interchangeable lens 200b does not include the lens side ROM 210 in which the lens data described above is stored.

  By the way, the form of the aperture drive command is not limited to the above-described form (a form in which different commands are used for the first interchangeable lens 200a and the second interchangeable lens 200b), and for example, the first interchangeable lens 200a and the first interchangeable lens 200b. It is also possible to share the aperture drive command output from the body control device 109 with the two interchangeable lenses 200b. If such a common aperture drive command is used, the second lens control device 209b refers to the drive amount and drive direction parameters of the aperture 206 included in the aperture drive command. The configuration is made such that the parameter indicating the driving speed 206 is not referred to. By configuring the second lens control device 209b in this manner, the diaphragm 206 is always driven at a predetermined speed (for example, the maximum speed) when the second interchangeable lens 200b is attached to the camera body 100 as described above. Will be.

(Description of Digital Camera System with Camera Body 100 and Third Interchangeable Lens 200c)
FIG. 4 is a schematic cross-sectional view of the camera body 100 and the third interchangeable lens 200c. Hereinafter, differences of the third interchangeable lens 200c from the first interchangeable lens 200a will be described.

  The third interchangeable lens 200c includes a third lens control device 209c instead of the first lens control device 209a.

  First, the body control device 109 performs initial communication with the third lens control device 209c via the above-described electrical contacts 102 and 202, and a third replacement is performed on the body side mount unit 101 based on the communication result. It is identified that the lens 200c is attached.

  The third interchangeable lens 200c does not include the aperture driving unit 208, and thus the third lens control device 209c does not support the aperture driving command. That is, the third interchangeable lens 200c cannot drive the diaphragm 206 by itself. Instead, a diaphragm interlocking lever (not shown) that interlocks with the diaphragm 206 is provided in the vicinity of the lens side mount portion 201 of the third interchangeable lens 200c. The diaphragm interlocking lever is a lever that can move along a predetermined direction. The position of the aperture interlocking lever is interlocked with the size of the aperture diameter of the aperture 206, and when the aperture interlocking lever is moved, the aperture diameter of the aperture 206 changes accordingly. That is, when it is desired to set the aperture diameter of the diaphragm 206 to a certain size, the diaphragm interlocking lever may be moved to a position corresponding to the aperture diameter.

  When the third interchangeable lens 200c is attached to the camera body 100, the aperture interlocking lever engages with a driving member (not shown) included in the in-body aperture driving unit 111. The in-body diaphragm drive unit 111 includes an actuator (not shown) that drives the drive member. When the in-body diaphragm driving unit 111 drives the driving member, the diaphragm interlocking lever engaged with the driving member moves, and the opening diameter of the diaphragm 206 changes. That is, the in-body diaphragm driving unit 111 drives the diaphragm 206 provided in the third interchangeable lens 200c. When the third interchangeable lens 200c is attached, the body control device 109 causes the in-body diaphragm drive unit 111 to drive the drive member instead of transmitting the diaphragm drive command to the third lens control device 209c. Thus, the aperture diameter of the diaphragm 206 is changed to a desired size.

  Furthermore, the third lens control device 209 c does not support prediction (calculation) of the driving time of the diaphragm 206. The third interchangeable lens 200c does not include the lens-side ROM 210 that stores the lens data described above.

(Description of initialization process in digital camera system of camera body 100 and interchangeable lens 200)
Next, an initialization process executed by the body control device 109 and each lens control device 209 (in particular, the first lens control device 209a) will be described. For example, when the interchangeable lens is attached to the camera body 100 in the power-on state, or when the camera body 100 is in the power-on state after the interchangeable lens is attached to the camera body 100 in the power-off state, the body control device 109 The initialization process is executed at a predetermined timing. The body control device 109 sets one of the first to fourth control modes in the camera body 100 in the initialization process described below. The contents of each control mode will be described later. In the following description, the first lens control device 209a, the second lens control device 209b, and the third lens control device 209c are collectively referred to as “lens control device”.

  FIG. 5 is a flowchart of initialization processing executed by the body control device 109. First, after the communication between the body control device 109 and the lens control device 209 is established, in a first step S100, a “lens function data request command” is transmitted to the lens control device. In step S110, the body control device 109 receives “lens function data” transmitted in response to the command from the lens control device. The lens function data is data for discriminating the function of the interchangeable lens. For example, the presence / absence of the aperture driving unit 208, whether the driving speed of the aperture 206 can be specified, the maximum driving speed at which the aperture 206 can operate (described above) Information on the maximum speed of the aperture) and information such as the presence or absence of a zoom mechanism.

  In step S120, it is determined from the content of the lens function data received in step S110 whether or not the interchangeable lens attached to the body side mount unit 101 is the third interchangeable lens 200c. For example, if it is recognized from the lens function data that the aperture driving unit 208 does not exist, it is determined that the third interchangeable lens 200c is attached. If it is determined that the third interchangeable lens 200c is attached, the process proceeds to step S121, and the control mode of the camera body 100 is set to the third control mode. When the third control mode is set, the body control device 109 performs drive control of the aperture 206 by the in-body aperture drive unit 111 and does not transmit an aperture drive command to the lens control device.

  On the other hand, if it is determined in step S120 that an interchangeable lens other than the third interchangeable lens 200c is attached, the process proceeds to step S130. In step S130, it is determined from the content of the lens function data received in step S110 whether or not the interchangeable lens attached to the body side mount unit 101 is the second interchangeable lens 200b. For example, if it is recognized from the lens function data that the drive speed of the diaphragm 206 cannot be specified, it is determined that the second interchangeable lens 200b is attached. If it is determined that the second interchangeable lens 200b is attached, the process proceeds to step S131, and the control mode of the camera body 100 is set to the second control mode. When the second control mode is set, the body control device 109 performs drive control of the aperture 206 by transmitting an aperture drive command to the lens control device, but the transmitted aperture drive command is the drive of the aperture 206. Does not include speed.

  On the other hand, if it is determined in step S130 that an interchangeable lens other than the second interchangeable lens 200b is attached, the process proceeds to step S140. In the present embodiment, the process proceeds to step S140 when an interchangeable lens that is neither the third interchangeable lens 200c nor the second interchangeable lens 200b is attached, that is, when the first interchangeable lens 200a is attached. It is.

  In step S140, the body control device 109 transmits a “determination data request command” to the first lens control device 209a. In step S150, the body control device 109 receives “lens side determination data” transmitted in response to the command from the first lens control device 209a. In this embodiment, the lens side determination data used for determination on the camera body side is the lens data itself stored in the lens side ROM 210. As described above, the lens data is used in the calculation formula (1) “T = a / v + α” for calculating the predicted drive time T from the aperture drive amount (drive stage number) a and the aperture drive speed v, and the calculation formula thereof. The aperture driving time correction term α is included. Therefore, the lens control device 209a transmits the arithmetic expression (1) “T = a / v + α” generated based on the lens data and the correction term α to the camera body as lens-side determination data. The lens-side ROM 210 stores the correction term α as numerical data and the arithmetic expression (1) as character string data. The lens control device 209a transmits the numerical data and character string data to the camera body. To do.

  In step S160, the body control device 109 compares the body-side determination data stored in the body-side ROM 112 with the lens-side determination data received in step S150, and determines whether the contents of these two data match. To do. The contents of the body side determination data of this embodiment are the lens side determination data itself (that is, the above-described arithmetic expression (1) and the correction term α) stored in advance in the body side ROM 112. In other words, in the present embodiment, the same data for determination (arithmetic expression (1) “T = a / v + α” and correction term α) are stored in advance in the body side ROM 112 and the lens side ROM 210, respectively. The body control device 109 determines whether the contents of the two lens data match.

  If the contents of the body side determination data and the lens side determination data match in step S160, the process proceeds to step S161, and the body control device 109 sets the control mode of the camera body 100 to the first control mode. When the first control mode is set, the body control device 109 performs drive control of the aperture 206 by transmitting an aperture drive command including the drive speed of the aperture 206 to the lens control device. Further, when the first control mode is set, the body control device 109 obtains a predicted drive time by transmitting an aperture drive time prediction command to the lens control device 209 before driving the aperture 206, and this predicted drive. The drive control of the diaphragm 206 using time is performed.

  On the other hand, if the contents of the body side determination data and the lens side determination data do not match in step S160, the process proceeds to step S162. In this case, the body control device 109 considers that the lens data stored in the ROM 210 in the first interchangeable lens 200a has been damaged by a strong electric shock such as static electricity, and drives the diaphragm 206. A fourth control mode in which restrictions are placed on the camera body 100 is set. In the fourth control mode, the body control device 109 does not transmit an aperture drive command to the first lens control device 209a, and performs a shooting operation or the like while the aperture diameter of the aperture 206 is fixed. In addition, a message indicating that there is an inconsistency in the contents stored in the ROM 210 (a defect on the lens side) is displayed on a display device (not shown) such as a liquid crystal display (so-called warning display). The user is informed that the control of the diaphragm 206 is restricted.

  In the present embodiment, as the contents of the “fourth control mode”, the message is displayed as described above, and the control of the diaphragm 206 is limited. However, the setting content of the fourth control mode is not limited to this. For example, the content of the fourth control mode may be limited to only the warning display as described above. Or you may make it restrict | limit the power supply from the camera body side to the accessory side more restrictively (for example, the power supply which should be supplied to a diaphragm drive system is prohibited). Or you may comprise so that a photography operation | movement may be prohibited on a still more restrictive, for example, camera body side.

  Also, the warning display method is not limited to the message display as described above, and any display form may be used as long as a warning that an abnormality has occurred on the lens side can be transmitted to the user. For example, a blinking or lighting warning display using an LED or the like may be used. Alternatively, a simple message display (for example, “aperture NG” or the like) indicating that the aperture control is restricted on a liquid crystal display or the like, or an icon display indicating the aperture NG may be used.

  FIG. 6 is a flowchart of lens initialization processing executed by the first lens control device 209a. First, in step S200, a “lens function data request command” is received from the body control device 109 (corresponding to step S100 in FIG. 5). In step S210, “lens function data” is transmitted to the body control device 109 (corresponding to step S110 in FIG. 5). In step S220, a “determination data request command” is received from the body control device 109 (corresponding to step S140 in FIG. 5). In step S230, the lens data is read from the ROM 210, and the read lens data is transmitted to the body control device 109 as “lens side determination data” (corresponding to step S150 in FIG. 5).

(Explanation of shooting process)
FIG. 7 is a flowchart of the photographing process executed by the body control device 109 in the first control mode. First, in step S300, the body control device 109 accepts a half-press operation of the release switch 120 made by the user. In step S310, the body control device 109 executes well-known automatic exposure (AE) control and automatic focus adjustment (AF) control. The body control device 109 calculates the aperture diameter (aperture value) of the diaphragm 206 at the time of exposure, the exposure time of the image sensor 104, and the like by this AE control. Thereafter, in step S320, the body control device 109 accepts a full pressing operation of the release switch 120 performed by the user. The body control device 109 starts exposure control in response to this full-press operation.

  In step S330, the body control device 109 transmits an aperture drive time prediction command to the first lens control device 209a. This command includes a parameter corresponding to the aperture diameter (aperture value) calculated in step S310. That is, the aperture drive time prediction command transmitted here is a command for causing the first lens control device 209a to predict the time required to drive the aperture 206 from the current aperture diameter to the aperture diameter calculated in step S310. It is.

  In step S340, the body control device 109 receives the predicted driving time of the diaphragm 206 from the first lens control device 209a. In step S350, an aperture drive command for driving the aperture 206 to the aperture diameter (aperture value) calculated in step S310 is transmitted to the first lens control device 209a. This command includes a parameter corresponding to the aperture diameter (aperture value) calculated in step S310.

  In step S360, the body control device 109 determines whether or not the predicted driving time of the diaphragm 206 received in step S340 is greater than a predetermined threshold value. In the present embodiment, this threshold value is a release time lag in the camera body 100 (for example, a time required for driving the quick return mirror 103 to the retracted position). That is, in step S360, it is determined whether or not the time required for preparation for photographing the diaphragm 206 is greater than the time required for preparation for photographing on the camera body 100 side.

  If it is determined in step S360 that the predicted drive time is greater than the predetermined threshold, the process proceeds to step S370. In step S370, the body control device 109 waits for a time necessary for completing the driving of the diaphragm 206, and then proceeds to step S380. Here, the waiting time is a time obtained by subtracting the release time lag on the camera body 100 side from the predicted driving time of the diaphragm 206. On the other hand, if the predicted driving time is equal to or less than the predetermined threshold value in step S360, the driving of the diaphragm 206 should be completed when the preparation for photographing on the camera body 100 side is completed. The process proceeds to step S380 without providing a waiting time. In step S380, a shooting operation is performed. That is, the image sensor 104 is exposed, and the body control device 109 creates captured image data based on the light reception output of the image sensor 104.

  FIG. 8 is a flowchart of a photographing process executed by the first lens control device 209a in the first control mode. First, in step S400, the first lens control device 209a receives an aperture drive time prediction command from the body control device 109 (corresponding to step S330 in FIG. 7). In step S410, parameters (aperture drive amount a and aperture drive speed v) included in the received aperture drive time prediction command and lens data stored in the lens-side ROM 210 (the above-described arithmetic expression (1) and correction). Based on the term α), the drive time of the diaphragm 206 is predicted (the predicted drive time is calculated). In step S420, the predicted drive time calculated in step S410 is transmitted to the body control device 109 (corresponding to step S340 in FIG. 7).

  In step S430, the first lens control device 209a receives an aperture drive command from the body control device 109 (corresponding to step S350 in FIG. 7). In step S440, the diaphragm drive unit 208 is controlled based on the parameters included in the received diaphragm drive command, and the diaphragm 206 is driven with the designated drive amount, drive direction, and drive speed.

  According to the camera system according to the first embodiment described above, the following operational effects can be obtained. (1) The first interchangeable lens 200a stores an optical system including a diaphragm 206 as a driven member, a diaphragm driving unit 208 that drives the diaphragm 206, and lens data related to driving of the diaphragm 206 by the diaphragm driving unit 208. And a lens-side ROM 210. The first lens control device 209a is configured based on lens data stored in the lens side ROM 210, and can determine whether lens data is correctly stored in the lens side ROM 210. Is transmitted to the camera body 100. Since it did in this way, the camera body side can judge the correctness of the lens data using the lens data used at the time of an actual imaging operation (aperture control operation). If it is determined as “positive” in this determination, it is assumed that the safety of the data held in the lens-side ROM 210 is high, that is, the lens data stored in the lens-side ROM 210 is correctly stored. Can be handled. As a result, the calculation of the predicted drive time of the diaphragm 206 performed during the subsequent photographing operation can be handled as being performed correctly.

(2) The body control device 109 is configured based on the lens data stored in the lens-side ROM 210, and can determine on the camera body 100 side whether the lens data is correctly stored in the lens-side ROM 210. Lens side determination data is received from the first interchangeable lens 200a, and based on the lens side determination data, it is determined whether or not lens data is correctly stored in the lens side ROM 210. Since it did in this way, since correctness of the lens data regarding aperture drive control can be judged before performing an actual imaging operation (aperture control operation), an imaging failure based on erroneous lens side data can be prevented in advance. .

(3) Based on the lens data stored in the ROM 210, the first lens control device 209a predicts a driving time required for the diaphragm driving unit 208 to drive the diaphragm 206 by a predetermined amount at a predetermined speed. . Since it did in this way, it becomes possible to make time linkage with the aperture drive by the side of the interchangeable lens 200, and the shutter drive by the side of a camera body on the camera body 100 side, and it can aim at shortening of a release time lag. I can do it.

(4) The first lens control device 209a transmits the lens data stored in the lens-side ROM 210 to the camera body 100 as lens-side determination data. Further, the body control device 109 receives lens data stored in the lens ROM 210 from the first interchangeable lens 200a as lens determination data. Since it did in this way, the correctness is judged using the lens side data (lens data) itself used for an actual photographing operation (aperture control operation). If it is determined as “positive” in this determination, the lens data can be handled as being correctly stored, and the calculation of the predicted driving time of the diaphragm 206 performed during the subsequent photographing operation is also handled as being correctly performed. I can do it.

(Second Embodiment)
The camera system according to the second embodiment of the present invention has the same configuration as that of the first embodiment except for a part thereof. Hereinafter, differences from the first embodiment will be described. In the following description, the same parts as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and the description thereof is omitted.

  In the camera system according to the second embodiment, the simple predicted drive time T ′ related to the predicted drive time T of the diaphragm 206 described above is set to a “simple method” (for example, a simple calculation) than the first embodiment described above. ) Is provided separately from the prediction method of the predicted drive time T, and the aperture predicted drive time (simple calculation value) obtained by the simple method is provided as lens-side determination data. And

Here, the “simple method” will be described. In the first embodiment, the lens data in the lens ROM 210 is calculated as an equation (1) “T = a / v + α” (aperture drive amount a, aperture drive speed v, predicted drive time T, correction term α) and a correction term. α is stored, and the predicted drive time T is calculated by using this arithmetic expression (1). On the other hand, in the lens ROM 210 in the second embodiment, in addition to the combination of the calculation formula (1) and the correction term α, a simple calculation by removing the correction term α from the calculation formula (1). Expression (2) “T ′ = a / v” is also stored. The “simple method” in the second embodiment is to calculate (generate) “simple predicted driving time T ′” using this simple arithmetic expression (2). As is apparent from the arithmetic expression (2), the “simple predicted driving time T ′” is a time calculated only by the aperture driving amount a and the aperture driving speed v.
The body control device 109 includes desired parameters (a desired aperture driving amount (stage number) a, a desired aperture driving speed v) instead of the determination data request command described in the first embodiment, and “simple "Simple predicted diaphragm drive time prediction command" requesting the interchangeable lens 200a for "a predicted drive time T '" is transmitted to the first lens control device 209a.

  On the other hand, the body control device 109 stores in advance the simple arithmetic expression “T ′ = a / v” having the same contents as the above-described simple arithmetic expression (2) in the body side ROM 112 as the body side data. That is, the simple arithmetic expression “T ′ = a / v” is an arithmetic expression stored in common in the body-side ROM 112 and the lens-side ROM 210 (in the following description, the simple arithmetic expression (2) is referred to as “common arithmetic operation”). Sometimes referred to as “expression”).

  The body control device 109 transmits the “simple version diaphragm drive time prediction command” to the first lens control device 209a, and then exchanges the common arithmetic expression (body side data) stored in the body side ROM 112 with the above-described common arithmetic expression. Based on the desired parameters (aperture drive amount a, aperture drive speed v) transmitted to the lens 200a, the aperture drive time is predicted independently.

  Specifically, the above-mentioned desired parameters (aperture drive amount a, aperture drive speed v) are applied to the common arithmetic expression included in the body side data, and a simple predicted drive time T ′ is calculated. Then, the simple predicted drive time T ′ received from the first lens control device 209a is compared with the simple predicted drive time T ′ calculated by itself, and if the values match, the lens data is stored in the lens-side ROM 210. It is considered that not only the arithmetic expression (2) but also the arithmetic expression (1) and the correction term α are stored correctly.

  FIG. 9 is a flowchart of initialization processing executed by the body control device 109 according to the second embodiment. Steps S100 to S130 are the same as the lens initialization process (FIG. 5) in the first embodiment, and a description thereof will be omitted.

  In step S130, when the body control apparatus 109 determines that the first interchangeable lens 200a is attached, the process proceeds to step S500. In step S500, the body control device 109 transmits a simplified version aperture drive time prediction command including desired parameters (aperture drive amount a and aperture drive speed v) to the first lens control device 209a. The parameter set here may be a fixed value (a predetermined parameter, that is, a combination of a predetermined aperture driving amount “a” and a predetermined aperture driving speed “v”), or a random value that changes every time the initialization process is executed. It may be a small value (both aperture drive amount a and aperture drive speed v may be a combination of random values, or only one of them may be a combination of random values). In the subsequent step S510, a simple predicted driving time T ′ is received from the first lens control device 209a.

  In step S520, the body control device 109 sets the body side data (common arithmetic expression) stored in the body side ROM 112 and the parameters (aperture drive amount a, aperture drive speed v) of the aperture drive time prediction command transmitted in step S500. Based on the above, the driving time of the diaphragm 206 is easily predicted. In step S530, it is determined whether the simple predicted driving time T ′ received in step S510 matches the simple predicted driving time T ′ calculated in step S520. If these two values match, the process proceeds to step S161, and the body control device 109 sets the control mode of the camera body 100 to the first control mode.

  On the other hand, if the simple predicted drive time T ′ calculated on the body side in step S530 does not match the simple predicted drive time T ′ calculated on the lens side, the process proceeds to step S162. In this case, the body control device 109 stores the lens data (not only the arithmetic expression (2) but also the arithmetic expression (1) and the correction term α) stored in the lens-side ROM 210 in the first interchangeable lens 200a. However, for example, the camera body 100 is set to the fourth control mode in which the driving of the diaphragm 206 is restricted by assuming that the camera body is broken due to a strong electric shock such as static electricity.

  FIG. 10 is a flowchart of initialization processing executed by the first lens control device 209a according to the second embodiment. Note that step S200 and step S210 are the same as the lens initialization process (FIG. 6) in the first embodiment, and a description thereof will be omitted.

  In step S600, the first lens control device 209a receives the “simple plate diaphragm driving time prediction command” from the body control device 109 (corresponding to step S500 in FIG. 9). In step S610, as in step S410 of FIG. 8, parameters (aperture drive amount a, aperture drive speed v) included in the received simplified version aperture drive time prediction command and lens data ( Based on the common calculation formula), the driving time of the diaphragm 206 is simply predicted (a simple predicted driving time T ′ is calculated). In step S620, the simple predicted driving time T ′ calculated in step S610 is transmitted to the body control device 109 (corresponding to step S510 in FIG. 9).

  According to the camera system according to the second embodiment described above, the following operational effects can be obtained. (1) The first lens control device 209a transmits a simple predicted driving time T ′ of the diaphragm 206 to the camera body 100 as lens-side determination data. In addition, the body control device 109 calculates a drive time necessary for driving the diaphragm 206 by an arbitrary amount (stage number) at an arbitrary speed, which is simply predicted by the first lens control device 209a based on the lens data (common arithmetic expression). The result T ′ calculated simply is received as lens-side determination data from the first interchangeable lens 200a. The body-side ROM 112 in the camera body 100 stores the same lens data (common arithmetic expression) as part of the lens data (common arithmetic expression) stored in the lens-side ROM 210 in the first interchangeable lens 200a. The The body control device 109 simply predicts a driving time required to drive the diaphragm 206 by an arbitrary amount (number of steps) at an arbitrary speed based on the lens data (common arithmetic expression) stored in the body side ROM 112, By comparing the simple predicted driving time T ′ with the lens-side determination data received from the first interchangeable lens 200a (simple predicted driving time T ′ calculated on the lens side), the simple predicted driving time T ′ is stored in the lens-side ROM 210. Lens-side determination data can be handled as being highly safe (can be handled as if the lens-side determination data stored in the lens-side ROM 210 is correctly stored), and consequently the lens-side ROM Treating itself as having high safety, that is, all lens data in the lens ROM 210 (common arithmetic expression, arithmetic expression (1 The all three) of the correction term α as high safety (with regards to what is properly stored) can be handled. Since it did in this way, since the safety | security of lens data can be confirmed only with the calculation result of simple prediction drive time T ', the size of lens side determination data can be reduced and communication load can be reduced. it can. Further, not only the lens data is correctly stored, but also whether or not the simple predicted driving time T ′ can be correctly calculated using the lens data (the calculation formula (2) which is a part of the calculation formula (1)). It is also possible to make a partial determination of the arithmetic expression (1).

(Third embodiment)
A camera system according to the third embodiment of the present invention has the same configuration as that of the first embodiment except for a part thereof. Hereinafter, differences from the first embodiment will be described. In the following description, the same parts as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and the description thereof is omitted.

  In the camera system according to the third embodiment, the body side data as described in the above embodiments is not stored in the body side ROM 112 of the camera body 100. The body control device 109 transmits two aperture drive time prediction commands having different parameters (at least one of the values of the aperture drive amount a and the aperture drive speed v) to the first lens control device 209a. Then, it is determined whether or not the lens data is correctly stored in the lens-side ROM 210 by determining whether or not the magnitude relationship between the two predicted drive times obtained by these commands is as expected.

  For example, the first diaphragm drive time prediction command (hereinafter sometimes referred to as “diaphragm drive time prediction command A”) has two stages of the diaphragm 206 at a predetermined diaphragm drive speed in a predetermined direction (a diaphragm drive amount a = This is a command for predicting the drive time when driving only in the second stage, and the second aperture drive time prediction command (hereinafter, sometimes referred to as “aperture drive time prediction command B”) is the first aperture drive. It is assumed that the command is a command for predicting the drive time when the diaphragm 206 is driven by four stages (aperture drive amount a = 4 stages) at the same diaphragm drive speed in the same direction as the time prediction command. In this case, the predicted drive time (v = predetermined speed, a = 2 steps, the above equation (1) and correction) transmitted from the first lens control device 209a as a response to the first aperture drive time prediction command The time calculated using the term α) is the predicted drive time (v = predetermined speed, a = 4 stages, the above-described calculation formula (1)) and the response to the second aperture drive time prediction command The time calculated using the correction term α should be smaller. This is because the aperture drive amount (2 stages) in the aperture drive time prediction command A is smaller than the aperture drive amount (4 stages) in the aperture drive time prediction command B. Naturally, the body control device 109 predicts the predicted drive time as a response to the aperture drive time prediction command A out of the predicted drive time transmitted from the first lens control device 209a, and the prediction as a response to the aperture drive time prediction command B. It is expected in advance that it is smaller (shorter) than the driving time. Therefore, the body control device 109 can correctly predict the driving time of the diaphragm 206 by determining whether or not the first predicted driving time is smaller than the second predicted driving time. That is, it is checked whether the lens data is correctly stored in the lens side ROM 210. In the third embodiment, when the first predicted driving time is smaller than the second predicted driving time, the first lens control device 209a can correctly predict the driving time of the diaphragm 206. presume.

  FIG. 11 is a flowchart of lens initialization processing executed by the body control device 109 according to the third embodiment. Steps S100 to S130 are the same as the lens initialization process (FIG. 5) in the first embodiment, and a description thereof will be omitted.

  If the body control device 109 determines in step S130 that the first interchangeable lens 200a is attached, the process proceeds to step S700. In step S700, the body control device 109 transmits an aperture drive time prediction command including a predetermined parameter (hereinafter referred to as an aperture drive time prediction command A) to the first lens control device 209a. The parameter set here may be a fixed value or a random value that is different each time the initialization process is executed. In subsequent step S710, a predicted driving time (hereinafter referred to as predicted driving time A) is received from the first lens control device 209a.

  In step S720, the body control device 109 transmits an aperture drive time prediction command (hereinafter referred to as an aperture drive time prediction command B) including parameters different from those transmitted in step S700. The parameter included in the aperture drive time prediction command B is a parameter that ensures that the drive time prediction result is larger than the parameter of the aperture drive time prediction command A. For example, the driving direction and the driving speed are the same, and the driving amount is larger for the aperture driving time prediction command B. Alternatively, the drive amount and the drive direction are the same, and the drive speed is made smaller for the drive time prediction command B. In subsequent step S730, the predicted driving time (hereinafter referred to as predicted driving time B) is received from the first lens control device 209a.

  In step S740, the body control device 109 determines whether or not the predicted drive time A received in step S710 is shorter than the predicted drive time B received in step S730. If the predicted drive time A is shorter than the predicted drive time B, the process proceeds to step S161, and the body control device 109 sets the control mode of the camera body 100 to the first control mode.

  On the other hand, if the predicted drive time A is equal to or longer than the predicted drive time B in step S740, the process proceeds to step S162. In this case, the body control device 109 considers that the lens data stored in the lens-side ROM 210 in the first interchangeable lens 200a has been damaged by a strong electric shock such as static electricity, and the diaphragm 206. The camera body 100 is set to a fourth control mode that restricts the driving of the camera.

  FIG. 12 is a flowchart of lens initialization processing executed by the first lens control device 209a according to the third embodiment. Note that step S200 and step S210 are the same as the initialization process (FIG. 6) in the first embodiment, and a description thereof will be omitted.

  In step S800, the first lens control device 209a receives the “aperture driving time prediction command A” from the body control device 109 (corresponding to step S700 in FIG. 11). In step S810, as in step S410 of FIG. 8, parameters (aperture drive amount a, aperture drive speed v) included in the received aperture drive time prediction command A and lens data stored in the lens side ROM 210 (above described above). Based on the calculation formula (1) and the correction term α), the driving time of the diaphragm 206 is predicted (the predicted driving time A is calculated). In step S820, the predicted driving time A calculated in step S810 is transmitted to the body control device 109 (corresponding to step S710 in FIG. 11).

  As the lens data stored in the lens-side ROM 210, the above equation (2) is stored, and in step S810, the driving time of the diaphragm 206 is predicted using this equation (2) (prediction). The driving time A may be calculated).

  In Steps S830 to S850, as in Steps S800 to S820, the “aperture driving time prediction command B” is received from the body control device 109 (corresponding to Step S720 in FIG. 11), and predicted driving is performed in the same manner as Step S810. Time B is calculated and transmitted to the body control device 109 (corresponding to step S730 in FIG. 11).

  According to the camera system of the third embodiment described above, the following operational effects can be obtained. (1) The body control device 109 transmits two diaphragm drive time prediction commands each including different parameters to the first lens control device 209a, and the first lens control device 209a transmits the response to these two commands. By comparing the two predicted drive times, it is determined whether or not the lens data is correctly stored in the ROM 210 (the safety of the lens data). As described above, it is possible to determine the safety of the lens data without having to store the body-side data used when determining the safety of the lens data in the body-side ROM 112 in the camera body 100 in advance. Can do.

(Fourth embodiment)
The camera system according to the fourth embodiment of the present invention has the same configuration as that of the first and second embodiments except for a part thereof. Hereinafter, differences from the first and second embodiments will be described. In the following description, the same parts as those of the first and second embodiments are denoted by the same reference numerals as those of the embodiments, and the description thereof is omitted.

  In the camera system according to the fourth embodiment, the predicted driving time T of the diaphragm 206 described above is calculated using the arithmetic expression (1) described in the first embodiment, and the calculated diaphragm prediction. The driving time is used as lens-side determination data.

  The body side ROM 112 in the fourth embodiment stores the arithmetic expression (1) in advance, but does not store data (numerical data) of the correction term α. This is because there is a possibility that the data size of the correction term α is large even if only one interchangeable lens data is used, and when trying to store the correction term α data of each of the plurality of interchangeable lenses in the body side ROM 112, For example, an additional memory (such as a ROM) may be required. Therefore, in the fourth embodiment, the data of the correction term α is not stored in advance in the body-side ROM 112, and whenever necessary, a data request command for the correction term α is issued to the interchangeable lens side. The system is configured to receive from the interchangeable lens side (lens side ROM 210). When the body control device 109 transmits an aperture drive time prediction command including desired parameters (aperture drive amount a, aperture drive speed v) to the lens control device 209a, a data request command for the correction term α. Send.

  When the lens control device 209 receives the aperture drive time prediction command, the lens control device 209 calculates the predicted drive time T using the arithmetic expression (1) and the correction term α data stored in the lens side ROM 210. When the lens control device 209 receives the data request command for the correction term α, the lens control device 209 extracts data of the correction term α suitable for the desired parameter from the plurality of data of the correction term α stored in the lens ROM 210. . Then, the lens control device transmits the calculated predicted driving time T and the extracted correction term α data (numerical data) to the body side.

  When the body control device 109 receives the data of the correction term α from the lens side ROM 210, the body control device 109 receives the data of the correction term α and the above-described arithmetic expression (1) (body side data) stored in the body side ROM 112. Based on the desired parameters (aperture drive amount a, aperture drive speed v) transmitted to the interchangeable lens 200a, the aperture drive time is independently predicted (calculated). Then, the predicted drive time T received from the first lens control device 209a is compared with the predicted drive time T calculated by itself, and if the values match, lens data (calculation formula (1)) is stored in the lens-side ROM 210. And the correction term α) is correctly stored.

  FIG. 13 is a flowchart of initialization processing executed by the body control device 109 according to the fourth embodiment. Steps S100 to S130 are the same as the lens initialization process (FIG. 5) in the first embodiment, and a description thereof will be omitted.

  In step S130, when the body control apparatus 109 determines that the first interchangeable lens 200a is attached, the process proceeds to step S900.

  In step S900, the body control device 109 transmits a drive time prediction command including desired parameters (aperture drive amount a and aperture drive speed v) to the first lens control device 209a. The parameter set here may be a fixed value (a predetermined parameter, that is, a combination of a predetermined aperture driving amount a and a predetermined aperture driving speed v), or a random value that is different every time the initialization process is executed. It may be a value (both aperture drive amount a and aperture drive speed v may be a combination of random values, or only one of them may be a combination of random values).

  In step S900, the body control device 109 transmits a command for requesting the data of the correction term α described above to the first lens control device 209a. In response to this request command, the body control device 109 requests the lens control device 209 for data of the correction term α suitable for the combination of the predetermined aperture drive amount a and the predetermined aperture drive speed v.

  In subsequent step S910, the predicted driving time T 'is received from the first lens control device 209a. In step S910, numerical data of the correction term α extracted by the lens control device 209a is received.

  In step S920, the body control device 109 stores the body side data (arithmetic expression (1)) stored in the body side ROM 112 and the parameters of the aperture drive time prediction command transmitted in step S900 (the aperture drive amount a, the aperture drive speed v ) And the numerical data of the correction term α acquired from the lens side in step S910, the driving time of the diaphragm 206 is simply predicted and calculated. In step S930, it is determined whether or not the predicted drive time T received in step S910 matches the predicted drive time T calculated in step S920. If these two values match, the process proceeds to step S161, and the body control device 109 sets the control mode of the camera body 100 to the first control mode.

  On the other hand, if the predicted driving time T calculated on the body side in step S930 does not match the predicted driving time T calculated on the lens side, the process proceeds to step S162. In this case, the body control device 109 uses the above-described lens data (at least one of the calculation formula (1) and the correction term α data) stored in the lens-side ROM 210 in the first interchangeable lens 200a, for example, static electricity or the like. The camera body 100 is set to the fourth control mode in which the driving of the diaphragm 206 is restricted.

  FIG. 14 is a flowchart of initialization processing executed by the first lens control device 209a according to the fourth embodiment. Note that step S200 and step S210 are the same as the lens initialization process (FIG. 6) in the first embodiment, and a description thereof will be omitted.

  In step S1000, the first lens control device 209a receives the “aperture driving time prediction command” and the “data request command for the correction term α” from the body control device 109 (corresponding to step S900 in FIG. 13). In step S1010, as in step S410 of FIG. 8, parameters (aperture drive amount a, aperture drive speed v) included in the received aperture drive time prediction command and lens data (calculation formula) stored in the lens-side ROM 210. Based on (1) and the numerical data of the correction term α, the driving time of the diaphragm 206 is predicted and calculated (the predicted driving time T is calculated). In step S1020, the predicted drive time T calculated in step S1010 is transmitted to the body control device 109 (corresponding to step S910 in FIG. 13).

  According to the camera system of the fourth embodiment described above, the following operational effects can be obtained. (1) Since it is possible to determine the safety of data stored in the lens-side ROM 210 without the body-side ROM 112 having the data of the correction terms α of a plurality of interchangeable lenses, the camera body The hardware configuration on the side can be simplified.

  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 each of the above-described embodiments, the example in which the present invention is applied to the lens data related to the driving of the diaphragm 206 that can move so as to change the size of the aperture through which the light beam passes has been described. However, the present invention is not limited to other driven members. It is also possible to apply to. For example, the present invention may be applied to lens data relating to driving of a focusing lens 204 that is movable in the direction of the optical axis X of the optical system. That is, the first interchangeable lens 200a may be configured so that the driving time of the focusing lens 204 can be predicted, and the lens data on the driving of the focusing lens 204 may be stored in the lens-side ROM 210. Further, a shake correction lens (a lens that can move so as to include a component in a direction perpendicular to the optical axis X) is added to the first interchangeable lens 200a, and the present invention is applied to this shake correction lens. It is also possible to apply.

(Modification 2)
In the first embodiment, not all lens data as lens-side determination data is transmitted to the camera body 100, but only a part thereof is generated as lens-side determination data and transmitted to the camera body 100. Good. For example, when the lens data includes an arithmetic expression for predicting the driving time of the diaphragm 206 and its correction term, only the arithmetic expression may be generated and transmitted as lens-side determination data. In this case, only the arithmetic expression needs to be stored in the body-side ROM 112 in the camera body 100.

  In addition, the lens-side determination data may be data other than the above-described calculation formula and correction term for the predicted driving time. For example, it may be a parameter other than the correction term given to the calculation formula of the predicted drive time, or data (for example, data “1LSB”) indicating the drive control unit of the diaphragm 206 (drive unit of the diaphragm drive unit 208). (The number of aperture driving stages to be expressed). Further, it may be data indicating whether lens data is stored in the lens-side ROM 210.

(Modification 3)
The timing for storing the body-side determination data in the body-side ROM 112 in the camera body 100 may be, for example, when the camera body 100 is manufactured or when the interchangeable lens is attached to the camera body 100 for the first time. May be. In the latter case, normal lens-side determination data is stored at the time of initial mounting, and then the lens data is determined each time the interchangeable lens is mounted.

(Modification 4)
In each embodiment described above, the lens data is determined in the initialization process, but the present invention is not limited to such an embodiment. For example, when the digital camera 1 is in a power-on state, the lens data may be determined every predetermined time, or the determination may be performed every time shooting is performed.

(Modification 5)
In the second embodiment, when two predicted drive times are compared, the two values do not necessarily match exactly. For example, an error may occur in the two predicted driving times depending on the precision of the floating-point arithmetic, and therefore, it may be determined that the two are in agreement when the difference between the two predicted driving times is equal to or less than a predetermined threshold value. .

(Modification 6)
In the second embodiment, the lens control device 209a simply calculates the aperture driving time using a common arithmetic expression. However, instead of such an arithmetic expression, a table (for example, an aperture driving amount a and an aperture driving speed v) is used. A simple aperture drive prediction time T ′ may be obtained using a two-dimensional table with the parameter as a parameter. In this case, the body control device 109 is also configured to have a table having the same contents as the calculation table.

(Modification 7)
In each of the above-described embodiments, when the fourth control mode is set (when it is determined that the lens data is not stored correctly), the aperture drive command is not transmitted to the first lens control device 209a, and the aperture is stopped. Although the photographing operation or the like is performed with the aperture diameter 206 being fixed, an operation different from those in each of the embodiments may be employed as the operation when the lens data is not stored correctly. For example, the drive speed of the diaphragm 206 may not be specified, but the diaphragm drive may be performed (a diaphragm drive command not including a drive speed parameter is transmitted) (that is, “second control mode” in the above-described embodiment) And the power supply to the interchangeable lens may be stopped, or photographing using the interchangeable lens may be prohibited.

(Modification 8)
In the second embodiment, the simplified version diaphragm drive time prediction command transmitted by the body control device 109 at the time of determination may be the same as the diaphragm drive time prediction command used at the time of shooting. That is, the arithmetic expression (1) stored in the lens-side ROM 210 of the interchangeable lens 200 mounted on the body-side mount portion, the same arithmetic expression (1) as the correction term α, and the correction term α are preliminarily stored on the body side. If stored in the ROM 112, the same determination as in the second embodiment can be made without using a separate simple common arithmetic expression (even if not stored in each other's ROM).

(Modification 9)
In each of the embodiments described above, the lens control device 209a calculates the aperture driving time T using the arithmetic expression (1) and the correction term α. A two-dimensional table using the amount a and the aperture driving speed v as parameters, in which a correction term α is added in advance to the numerical values in the table), and is configured to obtain the predicted aperture driving time T. Also good.

(Modification 10)
In the third embodiment, the first lens control is performed when the predicted drive time as a response to the aperture drive time prediction command A is smaller (shorter) than the predicted drive time as a response to the aperture drive time prediction command B. The apparatus 209a is configured to determine that the driving time of the diaphragm 206 can be correctly predicted (lens data is correctly stored in the lens-side ROM 210). However, the determination of the magnitude relationship may be reversed. That is, the body control device 109 sets the aperture drive amount in the aperture drive time prediction command A to be larger than the aperture drive amount in the aperture drive time prediction command B, and the first predicted drive time is the second. It is determined whether or not it is longer than the predicted driving time (if it is larger, the first lens control device 209a can correctly predict the driving time of the diaphragm 206, that is, the lens data is correctly stored in the lens-side ROM 210. May be determined).

(Modification 11)
In the third embodiment and the modification example 10, the first lens control device 209a obtains the predicted drive time according to the aperture drive time prediction commands A and B from the body control device 109, and the obtained drive times. The predicted drive time is configured to be transmitted to the body control device 109. The body control device 109 is configured to compare the two predicted drive times received from the lens control device 209a with each other to determine the magnitude. However, the body control device 109 does not receive the two predicted driving times and performs the comparison operation, but the magnitude relationship between the two predicted driving times (time A, B) (in the third embodiment, “time A <Time B>, or “Time A> Time B” in the modified example 10) only needs to be known. Therefore, after the lens control device 209a calculates the two predicted drive times, it compares the magnitude relationship between the two predicted drive times, and information indicating the comparison result (the magnitude of the calculated two predicted drive times) Information indicating the relationship, for example, information indicating “time A <time B” in the third embodiment and information indicating “time A> time B” in the modification 10) is transmitted to the body control device 109. You may comprise so that it may transmit.

(Modification 12)
In the second embodiment, the body control device 109 also performs simple prediction of the aperture driving time uniquely using the above-described “common arithmetic expression”. However, instead of performing the simple prediction (calculation) using the “common arithmetic expression”, the body control device 109 uses the table information (described later) (body side data) stored in the body ROM 112 in advance. The “simple predicted driving time T ′” may be obtained. Specifically, the body-side ROM 112 is provided with desired parameters (a combination of a desired aperture driving amount a and a desired aperture driving speed v) and “simple predicted driving time T ′” corresponding to each combination. The table information (body side data) to be configured is stored. The body control device 109 selects from the table information “simple predicted driving time T ′” to be used as a comparison target in accordance with desired parameters (aperture driving amount a and aperture driving speed v) sent as commands to the lens side. To do. Then, the body control device 109 compares the “simple predicted driving time T ′” transmitted from the lens control device 209a with the “simple predicted driving time T ′” selected from the table information. Subsequent processing is the same as in the second embodiment. In this way, the body control device 109 can compare the “simple predicted driving times T ′” without performing the calculation using the common calculation formula.

  Hereinafter, Modification 12 which is a modification of the second embodiment will be described with reference to FIGS. 15 and 16. In the following description, the same portions as those of the second embodiment are denoted by the same reference numerals as those of the second embodiment, and the description thereof is omitted.

  FIG. 15 is a diagram illustrating an example of table information stored in the body side ROM 112. The body side ROM 112 stores the table information 10 instead of the above-described “simple arithmetic expression (2)“ T ′ = a / v ””. The table information 10 includes a plurality (five in FIG. 16) of sets in which simple predicted drive times T ′ are associated with parameters including the aperture drive amount a and the aperture drive speed v. In the following description, this set is called a parameter set (body side data). Note that the simple predicted drive times T1 ′ to T5 ′ shown in FIG. 15 are the previously described “simple calculation formula (2)” stored in advance in a computer or the like installed in a factory that manufactures the camera system, for example. The values are calculated in advance by substituting the aperture driving amounts a1 to a5 and the aperture driving speeds v1 to v5 shown in FIG. This table information is stored in the body side ROM 112 at the time of factory shipment.

  FIG. 16 is a flowchart of an initialization process executed by the body side control device 109 according to the modification 12. The operations in steps S100 to S131 are the same as those in the flowchart shown in FIG.

  When the first interchangeable lens 200a is attached to the camera body 100, the body-side control device 109 makes a negative determination in step S130, and the process proceeds to step S1090. In step S <b> 1090, the body control device 109 selects any one parameter set from the table information 10 stored in the body side ROM 112.

  In subsequent step S1100, the body control device 109 transmits a simplified plate stop driving time prediction command to the first lens control device 209a. This command includes the aperture drive amount and aperture drive speed of the parameter set selected in step S1090. For example, when the first set is selected in step S1090, the command transmitted in step S1100 includes the aperture drive amount a1 and the aperture drive speed v1.

  In the next step S510, the body control device 109 receives a simple predicted driving time T ′ calculated by the first lens control device 209a from the first lens control device 209a. The predicted driving time T ′ is calculated by the first lens control device 209a giving the aperture driving amount and aperture driving speed included in the command transmitted in step S1100 to the above-described simple arithmetic expression (2). It is the value. For example, when the first set is selected in step S1090, the first lens control device 209a calculates a simple predicted driving time T ′ using the aperture driving amount a1 and the aperture driving speed v1.

  In step S1120, the body control device 109 acquires, from the table information 10, a simple predicted drive time T ′ included in the parameter set selected in step S1090. For example, if the first set is selected in step S1090, a simple predicted driving time T1 'included in the first set is acquired in step S1120. Thereafter, in step S1130, the body control apparatus 109 determines whether or not the simple predicted drive time T ′ received in step S510 matches the simple predicted drive time T ′ (for example, T1 ′) acquired in step S1120. Determine. If these two values match, the process proceeds to step S161, and the body control device 109 sets the control mode of the camera body 100 to the first control mode described above. On the other hand, if the two values do not match in step S1130, the process proceeds to step S162, and the aforementioned fourth control mode is set to the camera body 100.

  In the modification 12, the operation of the first lens control device 209a is the same as the flowchart shown in FIG.

  By the way, in the modified example 12, when the simple predicted drive times T1 ′ to T5 ′ in the table information 10 are calculated in advance, and the simple predicted drive time T ′ received from the interchangeable lens side in step S510 of FIG. As a calculation formula used when calculating the value on the interchangeable lens side, a simple calculation formula (2) “T ′ = a / v” is used. However, instead of this simple arithmetic expression (2), the above-described arithmetic expression (1) “T = a / v + α (T = α + a / v)” may be used.

  Moreover, in the said modification 12, although the table information 10 demonstrated the example containing five parameter sets of the 1st-5th set, the number of parameter sets is not restricted to five, and it may be more or less than this. Good. For example, the table information 10 may include only one parameter set. However, if two or more parameter sets are included in the table information 10, two or more parameter sets are sequentially transmitted to the interchangeable lens side, and a simple predicted driving time T ′ can be checked for each of them. The table information 10 preferably includes a plurality of parameter sets because the effect of checking the safety of the lens data stored in the lens-side ROM 210 can be enhanced.

(Modification 13)
In each of the above-described embodiments and modifications, in the control on the camera body side, a determination operation as to whether the body control device sets the first control mode or the fourth control mode described above. (For example, step S160 in FIG. 5, step S530 in FIG. 9, step S1130 in FIG. 15, etc.) is performed only once. The camera body may be configured to perform this determination multiple times. Alternatively, after making this determination once and setting the first or fourth control mode, again at a predetermined timing (for example, when a re-determination is requested or when a predetermined time has elapsed since the previous determination). This determination may be performed. Further, this determination may be repeated every predetermined period.

  When performing this re-determination, the camera body side requests the interchangeable lens side to send the lens-side determination data to the camera body again, and the camera body side also compares it with the lens-side determination data. It will operate to prepare the data for use again. Taking an example in FIG. 15, the operation from step S1090 to step S1130 is repeated to repeat.

  As long as the characteristics of the present invention are not impaired, the present invention is not limited to the above-described embodiments, and other forms 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 100 ... Camera body, 101 ... Body side mount part, 102, 202 ... Several electrical contact, 103 ... Quick return mirror, 104 ... Image sensor, 105 ... Submirror, 106 ... Focus detection apparatus, 107 ... Finder screen, 108 ... Penta Prism 109 109 Body control device 110 Eyepiece 111 111 In-body diaphragm drive unit 112 210 210 ROM 120 Release switch 200a First interchangeable lens 200b Second interchangeable lens 200c Third interchangeable lens, 201 ... Lens side mount, 204 ... Focusing lens, 206 ... Aperture, 207 ... Lens drive, 208 ... Aperture drive, 209a ... First lens controller, 209b ... Second lens control Device, 209c ... third lens control device

Claims (12)

Means for attaching the camera body;
Communication means for communicating with the camera body;
A driven member;
Control means for controlling the driven member;
Storage means for storing lens data related to control of the driven member by the control means,
When the control means receives drive amount information and drive speed information related to the driven member from the camera body via the communication means, it is determined whether or not the lens data is correctly stored in the storage means. An interchangeable lens that transmits lens side determination data that can be determined on the camera body side to the camera body via the communication means. Means for attaching the camera body;
Communication means for communicating with the camera body;
A driven member;
Control means for controlling the driven member;
Storage means for storing lens data related to control of the driven member by the control means,
When the control means receives drive amount information and drive speed information regarding the driven member from the camera body via the communication means, the camera determines whether or not the lens data stored in the storage means can be used. An interchangeable lens that transmits lens-side determination data that can be determined on the body side to the camera body via the communication means. Means for attaching the camera body;
Communication means for communicating with the camera body;
A driven member;
Control means for controlling the driven member;
Storage means for storing lens data related to control of the driven member by the control means,
When the control unit receives the driving amount information and the driving speed information regarding the driven member from the camera body via the communication unit, the control unit determines whether or not the data matches the data acquired in the camera body. An interchangeable lens that transmits lens-side determination data that can be determined on the camera side to the camera body via the communication means. The interchangeable lens according to claim 3,
The data acquired in the camera body is an interchangeable lens that is data stored in advance in the camera body regarding the drive time of the driven member corresponding to the drive amount information and the drive speed information. The interchangeable lens according to claim 3,
The data acquired in the camera body is an interchangeable lens that is data relating to the drive time of the driven member calculated by the camera body based on the drive amount information and the drive speed information. In the interchangeable lens according to any one of claims 1 to 5,
The interchangeable lens in which the control means obtains the lens side determination data by a calculation based on the lens data, the driving amount information, and the driving speed information. The interchangeable lens according to claim 6,
The lens data is an interchangeable lens including an arithmetic expression using the driving amount information and the driving speed information. The interchangeable lens according to claim 7,
The arithmetic expression is an arithmetic expression for predicting a driving time required to drive the driven member by the driving amount represented by the driving amount information at the driving speed represented by the driving speed information. . The interchangeable lens according to claim 8,
The lens data includes a simple arithmetic expression for predicting the driving time using only the driving speed information and the driving amount information,
The control unit is an interchangeable lens that transmits the driving time predicted using the simple arithmetic expression to the camera body as the lens-side determination data. The interchangeable lens according to claim 8,
The control means calculates the drive time using the calculation formula each time a combination of the drive speed information and the drive amount information is received, and uses the calculated drive time as the lens-side determination data as the camera body. To send interchangeable lens. In the interchangeable lens according to any one of claims 1 to 10,
The interchangeable lens that performs the control based on a drive command received from the camera body via the communication unit after the control unit transmits the lens-side determination data to the camera body. In the interchangeable lens according to any one of claims 1 to 11,
An optical system including the driven member;
The driven member is a member that is movable in the optical axis direction of the optical system, a member that is movable so as to include a component in a direction perpendicular to the optical axis direction, or a size of an aperture through which a light beam passes. An interchangeable lens including any of the movable members.

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