JP2000075384A - Camera system and interchangeable lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an identical interchangeable lens to be used in common by a body for silver-salt film photographing and a body for CCD photographing without increasing a cost. SOLUTION: This camera system is provided with the plural kinds of camera bodies 1a and 1b and the interchangeable lens 4 which can be attached and detached with respect to the bodies 1a and 1b. The bodies 1a and 1b are constituted so that information being peculiar to the camera bodies are produced by camera body information production parts 3a and 3b. The lens 4 is constituted so that a focusing action is controlled by a control part 5. Besides, the control method of the focusing action of the lens 4 is set based on the outputs of the production part 3a and 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a camera system and an interchangeable lens used in the camera system, and more particularly to a focus adjusting device for a camera system in which a lens is interchangeable.

[0002]

2. Description of the Related Art Heretofore, a lens system which can be exchanged for video equipment such as a video camera has been used. For example,
Japanese Patent Application Laid-Open No. 9-65185 discloses a video camera system with interchangeable lenses. This video camera system transmits focus information by a contrast detection method using a video signal of an image sensor in a camera body to an interchangeable lens, and performs focus adjustment in the interchangeable lens.

[0003] Japanese Patent Application Laid-Open No. 9-211653 discloses a silver halide camera system with interchangeable lenses. This camera system performs focus adjustment based on focus information from a phase difference type focus detection unit in a camera body.

[0004]

However, in the system disclosed in Japanese Patent Application Laid-Open No. 9-65185 described above, photography using a silver halide film cannot be performed. Also, in the system disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-211653, it is not possible to perform photographing using the image pickup device CCD.

Further, a silver halide film photographing body (hereinafter, referred to as a silver halide body) which can commonly use an interchangeable lens and a CC
A camera system having a body for photographing D (hereinafter, referred to as a CCD body) has been put on the market. The CCD body is described in Photo Industry March 1995, page 107.

This camera system has a phase difference detection type focus detection unit in each body, and performs a focus adjustment in a focus adjustment unit in the interchangeable lens based on the output of the focus detection unit. Things.

However, since a focus detection unit of the phase difference detection method is further mounted on the CCD body, there is a problem that the cost is increased. In order to solve such a problem, it is possible to eliminate the phase difference detection focus detection unit by applying a contrast method using a video signal of the image pickup device CCD in the CCD body. However, there is a problem that the focus adjustment cannot be performed because the focus adjustment unit in the interchangeable lens does not support the contrast method.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a camera system in which the same interchangeable lens can be used in common for a silver halide film photographing body and a CCD photographing body without increasing the cost. And an interchangeable lens.

[0009]

That is, the present invention relates to a camera system having a camera body and an interchangeable lens detachable from the camera body, wherein the camera body generates information unique to the camera body. The interchangeable lens includes a body information generating unit, the interchangeable lens includes a control unit that controls a focus adjustment operation, and the interchangeable lens includes
A control method of a focus adjustment operation is set based on an output of the camera body information generating means.

According to another aspect of the present invention, there is provided an interchangeable lens detachable from the camera body, wherein the receiving means receives the information unique to the camera body transmitted from the camera body, and the information unique to the camera body received by the receiving means. Control means for setting a control method of the focus adjustment operation based on the information.

According to the present invention, in a camera system having a camera body and an interchangeable lens detachable from the camera body, information unique to the camera body is generated by the camera body information generating means. Is done. On the other hand, in the interchangeable lens, the focus adjustment operation is controlled by the control unit. Further, the interchangeable lens is based on the output of the camera body information generating means,
The control method of the focus adjustment operation is set.

According to the present invention, in the interchangeable lens detachable from the camera body, the information unique to the camera body transmitted from the camera body is received by the receiving means, and the information received by the receiving means is received by the receiving means. Based on the information unique to the camera body, the control means sets the control method of the focus adjustment operation.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the concept of a camera system and an interchangeable lens according to the present invention.

In FIG. 1, a plurality of types of camera bodies 1 are shown.
a and 1b respectively include focus detection units 2a and 2b as focus detection units for detecting a focus state, and camera body information generation units 3a and 3b as camera body information generation units for generating information unique to the camera body. ing. Further, the interchangeable lens 4 includes a control unit 5 as a control unit for controlling a focus adjustment operation.

In such a configuration, the focus detection output detected by the focus detection units 2a and 2b and the body information output of the camera body information generation units 3a and 3b are:
It is sent from the camera bodies 1a and 1b to the interchangeable lens 4 side. On the interchangeable lens 4 side, the control unit 5 changes the control method of the focus adjustment operation based on the focus detection output and the body information output to perform the focus adjustment.

The camera body has a plurality of versions of the camera bodies 1a and 1b, and the focus detection method differs depending on the version. In the interchangeable lens 4, the control unit 5 determines the body type based on the body information output, and the control method of the focus adjustment operation using the focus detection outputs of the focus detection units 2a and 2b is changed accordingly. As a result, a focus adjustment operation is performed using a control method most suitable for the camera body conditions.

Next, a first embodiment of the present invention will be described. FIG. 2 shows an optical path diagram of a camera to which the camera system according to the first embodiment of the present invention is applied. This camera system is composed of a combination of a CCD imaging body and an interchangeable lens.

In FIG. 2, the interchangeable lens 4 includes a photographing optical system 11 having a focus adjusting lens 11a and the like, and an aperture 12
, A beam splitter 13, a mirror 14, a first focus detection unit 15, and the like. A light beam from a subject passes through a photographing optical system 11, and a part of the light beam is converted by a beam splitter 13 into a CCD photographing body (camera body).
1 a, and a part thereof is guided to the first focus detection unit 15 via the mirror 14.

The aperture 12 has a shutter function, can hold a predetermined aperture, and has a function of completely blocking light. In addition, the first focus detection unit 15 employs a known phase difference detection method,
It has a phase difference optical system unit and an AF sensor.

After passing through the photographing optical system 11, the camera body 1
The light beam of the object guided into a is further divided by the beam splitter 2
A part of the light is guided to an image pickup device (CCD) 24 via an infrared cut filter 22 that cuts an infrared light component and an optical LPF (low-pass filter) 23 that reduces moire. The other part of the light beam that has passed through the beam splitter 21 is reflected by a mirror 25 and then guided to a finder optical system 26.

Incidentally, there is a camera body which does not have the infrared cut filter 22 and the optical LPF 23 in other versions of the CCD body. In such a camera body for CCD photographing, the camera body 1a has
Data is written and stored in an EEPROM in the body microcomputer described later, and the data is read out at the time of focus detection and used for focus correction.

FIG. 3 is a block diagram showing an electrical configuration of the interchangeable lens 4 and the camera body 1a of FIG. In FIG. 3, the interchangeable lens 4 includes a lens microcomputer (hereinafter abbreviated as “microcomputer”) 31, an AF sensor 32 forming a part as a first focus detection unit, an aperture control unit 33, and a lens driving unit. And a part 34. Also,
The part connected to the camera body 1a includes the interchangeable lens 4
A plurality of electrical contacts 7 for communication between the camera body 1a and the camera body 1a are provided.

The lens microcomputer 31 is a control device for the interchangeable lens 4 and includes a receiving means.
(Central processing unit) 31a, ROM 31b, RAM 31
c, EEPROM 31d and A / D converter (AD
C) 31e. This lens microcomputer 31
A series of operations are performed according to a sequence program stored in the internal ROM 31b. In addition, the above EEPR
The OM 31d can store correction data relating to focus adjustment control and the like for each camera body.

The operation of the AF sensor 32 constituting a part of the first focus detecting section 15 is controlled by the lens microcomputer 31. The AF sensor data output from the AF sensor 32 is subjected to A / D exchange in the lens microcomputer 31 and stored in the RAM 31c in the lens microcomputer 31.

In the lens microcomputer 31, focus detection calculation is performed based on the data of the AF sensor, and correction calculation is performed based on correction data transmitted from a body microcomputer 41 described later in the camera body 1a. The drive amount, drive direction, drive speed, and the like of the adjustment lens 11a are calculated.

Here, the first focus detection section 15 is set so as to have characteristics such as focus detection accuracy and defocus detection range that are optimized according to the type of the interchangeable lens 4. The aperture driving unit 33 drives the aperture 12 based on a command from the lens microcomputer 31. The lens driving unit 34 drives the focus adjusting lens 11a based on a command from the lens microcomputer 31.

Next, the electrical configuration of the camera body 1a for CCD photographing will be described. The camera body 1a includes a body microcomputer (hereinafter abbreviated as a microcomputer) 41, an imaging device (CCD) 24, a video signal processing unit 42, a second focus detection unit 43, a recording unit 44, and a photometry unit 45. , Display section 46, first release switch (1RSW) 47 and second release switch (2RSW)
SW) 48. In addition, a plurality of electrical contacts 8 for performing communication between the camera body 1a and the interchangeable lens 4 are provided on a mount portion on which the interchangeable lens 4 is mounted.

The body microcomputer 41 includes a camera body 1a.
The control device includes a transmitting means, and includes, for example, a CPU (central processing unit) 41a, a ROM 41b, and a RAM inside.
41c, EEPROM 41d and A / D converter (A
DC) 41e. This body microcomputer 41
Performs a series of operations according to a sequence program stored in the internal ROM 41b. Also, EEPR
The OM 41d can store correction data for focus adjustment, photometry, AWB (auto white balance), strobe control, and the like for each camera body.

In the CCD 24, a subject image formed by the photographing optical system 11 is picked up and converted into an electric signal.
The video signal processing unit 42 generates a video signal according to the electric signal from the CCD 24. This video signal is recorded in the recording unit 44 after performing predetermined processing as image data at the time of shooting. The second focus detection unit 43 performs focus detection based on the video signal output from the video signal processing unit 42.

The photometric unit 45 calculates a photometric output according to the brightness of the subject, a shutter speed at the time of exposure, and an aperture value based on the video signal. In the body microcomputer 41, the CCD 2 at the time of shooting is
4 are controlled. The aperture value data is transmitted to the lens microcomputer 31 by the body microcomputer 41. During photographing, the lens microcomputer 31 controls the aperture 12 in the photographing optical system 11.

In the display section 46, the image picked up by the CCD 24 and the information inside the camera are displayed by an LCD, an LED or the like, and controlled by the body microcomputer 41.
The 1RSW 47 and the 2RSW 48 are switches linked to a release button (not shown). Release button 1
The 1RSW 47 is turned on by pressing down in a step, and the 2RSW 48 is subsequently turned on by pressing down in a second step. In the body microcomputer 41, photometry with 1RSW 47, A
F is performed, and the exposure operation and the image recording operation are performed when the 2RSW 48 is turned on.

In some cases, the body for photographing a silver halide film and the body for photographing a CCD cannot have the same flange back (distance from the lens mount to the imaging surface) for structural reasons. For that purpose, it is necessary to determine whether or not focusing is performed by adding data corresponding to the displacement of the flange back to the focus detection result in the interchangeable lens 4. Therefore, the flange back deviation data for each body type is stored in the EEPROM 41d in the body microcomputer 41. This EEPR
The flange back deviation amount data stored in the OM 41d is transmitted to the lens microcomputer 31 in the interchangeable lens 4 and used as a correction value at the time of focus detection.

The shift amount peculiar to each camera body is adjusted for each body at the factory at the time of shipment, but is added to the shift amount data or separately written in an EEPROM, and the correction value is set at the time of focus detection. Used as

Next, the configuration of the camera body for photographing a silver halide film will be described. FIG. 4 shows an optical path diagram of a silver halide film photographing body and an interchangeable lens to which the camera system according to the first embodiment of the present invention is applied. The description of the interchangeable lens 4 is omitted because it is the same as that of FIG.

In FIG. 4, a light beam from an object which has been guided into the camera body 1b for photographing a silver halide film through the photographing optical system 11 is incident on the main mirror 51. This main mirror 51 is constituted by a half mirror,
70% of the incident light amount is reflected toward a finder optical system 54 described later. On the other hand, the remaining 30% of the amount of incident light passes through the main mirror 51 and is reflected by the sub-mirror 52 before being guided to the third focus detection unit 53. The third focus detection unit 53 employs a known phase difference detection method.

The finder optical system 54 is observed by a photographer through a screen 55, a pentaprism 56, and an eyepiece 57. At the time of film exposure, the main mirror 51 and the sub-mirror 52 are retracted to the positions indicated by broken lines in the drawing. The luminous flux passing through the interchangeable lens 4 is transmitted to the film 5 while the shutter 58 is open.
9 is exposed.

It should be noted that some versions of the silver halide film photographing body do not include the third focus detection unit 53. In this case, the main mirror 51 is constituted by a total reflection mirror, and 100% of the incident light amount is reflected toward the finder optical system 54. The camera body 1b includes a ROM of a body microcomputer, which will be described later, and an EEPROM.
The fact that the third focus detection unit 53 does not exist is stored in the OM, and is transmitted to the lens microcomputer in the interchangeable lens 4 as necessary.

FIG. 5 is a block diagram showing an electrical configuration of the interchangeable lens 4 of FIG. 4 and a camera body 1b for photographing a silver halide film. In addition, about the structure of the interchangeable lens 4,
The description is omitted because it is the same as the interchangeable lens 4 shown in FIG.

In FIG. 5, a camera body 1b is a body microcomputer (hereinafter abbreviated as a microcomputer).
61 and an AF sensor 6 constituting a part of the third focus detection unit
2, a mirror drive unit 63, a shutter drive unit 64, a film drive unit 65, a photometric unit 66, a display unit 67, a first release switch (1RSW) 68, and a second release switch (2RSW) 69. ing.
In addition, a plurality of electrical contacts 9 for performing communication between the camera body 1b and the interchangeable lens 4 are provided on a mount portion on which the interchangeable lens 4 is mounted.

The body microcomputer 61 includes a camera body 1b
The control device includes a transmitting means, and includes, for example, a CPU (central processing unit) 61a, a ROM 61b, and a RAM therein.
61c, EEPROM 61d and A / D converter (A
DC) 61e. This body microcomputer 61
Performs a series of camera operations in accordance with a camera sequence program stored in the internal ROM 61b. The EEPROM 61d can store correction data for AF control, photometry, and the like for each camera body.

The AF sensor 62 constitutes a part of the third focus detection section as described above, and AF sensor data is output from the AF sensor 62 to the body microcomputer 61. The output AF sensor data is A / D-converted by an ADC 61e in the
Stored in the AM 61c. The body microcomputer 61 performs a focus detection calculation based on the AF sensor data, and transmits a defocus amount as a third focus detection value to the lens microcomputer 31.

In the photometric section 66, an output is generated according to the brightness of the subject. In the body microcomputer 61, the photometric output is A / D converted by the ADC 61e and stored in the RAM 61c as a photometric value.

The mirror driving unit 63 includes the photographing lens 11
The main mirror 51 is driven to switch the light beam having passed through to the film 59 side and the finder 54 side. In addition, the shutter driving unit 64
When the exposure is performed, the shutter is driven. Further, the film driving section 65 is for performing winding and rewinding driving of the film 59. The display section 67 is for displaying information inside the camera using an LCD, an LED, or the like. The AF sensor 62, the mirror driving unit 63, the shutter driving unit 64, the film driving unit 65, the photometry unit 66, and the display unit 67 are all controlled by the body microcomputer 61.

The 1RSW 68 and 2RSW 69 are switches linked to a release button (not shown). The 1 RSW 68 is turned on when the release button is depressed in the first stage, and the 2 RSW 69 is subsequently turned on when depressed in the second stage. In the body microcomputer 61, 1RSW68
, The photometry and AF operations are performed, and the exposure operation and the film winding operation are performed when 2RSW is turned on.

FIGS. 6 (a), 6 (b) and 6 (c) are views showing the focus detection areas in the photographed images of the first focus detection unit, the second focus detection unit, and the third focus detection unit. That is, FIG. 6A shows a first focus detection area 72 of the first focus detection unit 15 in the interchangeable lens 4 with respect to the shooting screen 71. Similarly, FIG. 6B shows a second focus detection area 73 of the second focus detection unit 43 in the camera body 1a for CCD imaging with respect to the imaging screen 71. Further, in FIG. 6C, a third focus detection unit 53 in the camera body 1b for photographing a silver halide film is displayed on the photographing screen 71.
The third focus detection area 74 of FIG.

As can be seen from FIGS. 6 (a) to 6 (c), the focus detection areas are almost the same. Next, the operation in the combination of the interchangeable lens and the camera body configured as described above will be described.

First, the control operation of the lens microcomputer 31 will be described with reference to the flowchart "lens main routine" in FIG. The lens microcomputer 31 supports a plurality of versions of AF control. Here, it is assumed that the camera body has versions 1, 2, and 3. Version 1 is a body for photographing a silver halide film without a built-in focus detecting unit, version 2 is a body for photographing a CCD having a second focus detecting unit using an image sensor as a CCD, and version 3 is a body for photographing a CCD Built-in silver halide film shooting body.

When the "lens main routine" is started, in step S1, initialization of each block in the interchangeable lens 4 is performed, and mutual communication with the camera body microcomputer is performed. The signal is received, and the type of the camera body and the type of the focus detection value transmitted from the camera body are determined. Also, various correction data used at the time of focus detection are received. As the correction data, flange back deviation data, defocusing data by a photographing medium (silver film, CCD), C
There are defocus data depending on the presence or absence of an infrared cut filter on the CD body, data on a permissible focusing range according to the photographing medium, and definition data of a focus detection area according to the size of the photographing medium.

In step S2, it is determined whether the command transmitted from the body microcomputer is an AF command or another command. here,
If it is an AF command, it is determined in subsequent step S3 whether or not the camera body on which the interchangeable lens 4 is mounted is version 1.

If it is determined in step S3 that the version is 1, the process proceeds to step S4. And
A subroutine "AF1", which is an AF sequence in the case where there is no focus detection unit in the camera body, is executed, and the lens driving based on the defocus amount which is the focus detection value of the first focus detection unit (phase difference detection method) 15 in the lens. Control is performed.

If it is determined in step S3 that the version is not version 1, it is determined in step S5 whether or not the version is version 2. Here, if it is determined that the version is 2, that is, the camera body 1a for CCD photographing, the process proceeds to step S6, where the subroutine "AF2" is executed, and the first focus detection unit in the lens (phase difference detection method) A) lens drive control based on the defocus amount of 15 and the second focus detection unit 43 in the camera body 1a.
A with hill-climbing control using the focus evaluation value of
F control is performed.

If it is determined in step S5 that the camera is not version 2, it is determined that the camera is version 3, that is, the camera body 1b for photographing a silver halide film incorporating a third focus detection unit, and the flow advances to step S7. Executes the subroutine "AF3". Thus, the lens drive control based on the defocus amount of the first focus detection unit 15 in the lens and the lens drive control based on the defocus amount of the third focus detection unit (phase difference detection method) 53 in the camera body are used together. AF control is performed.

Then, in step S8, communication with the body microcomputer is performed, acquisition of a command from the body microcomputer, and transmission of a focus signal are performed. On the other hand, if it is determined in step S2 that the command is not an AF command, the flow advances to step S9 to perform aperture control because the command is an aperture control command. Thereafter, the process proceeds to step S8.

Next, referring to the flowchart of FIG.
The subroutine “AF” in FIG.
1 ". In step S11, a control signal is output to the first focus detection unit 15 to perform focus detection. Then, the output of the first focus detection unit (phase difference method) 15 Then, in step S12, the defocus amount DF is calculated as
The lens microcomputer 31 has already been communicated with the camera body.
Correction data Hd (focus deviation correction data such as flange back deviation amount data) stored in the RAM 31c in the memory
Is corrected based on the DF '= DF + Hd (1) Then, in step S13, the first focus detection unit 15 uses the data D related to the in-focus range transmitted from the camera body and stored in the RAM 31c in the lens microcomputer 31. The focus allowable range Gd in terms of defocus amount at the time of focus detection is calculated by, for example, the following equation (2). Gd = FNO × D (2) (where FNO is the open FNO of the photographing optical system) That is, the correction defocus amount DF ′ is within the allowable range G
is compared with d to determine whether it is within the allowable range Gd.
The allowable range Gd is data unique to the type of the camera body.

If it is outside the allowable range Gd, step S14
Then, the driving amount of the focusing lens 11a to be focused on is calculated from the corrected defocus amount DF ', and the focusing lens 11a is driven. Then, step S
Returning to step 11, the above operation is repeated until the detected corrected defocus amount DF 'falls within the allowable range Gd.

When the corrected defocus amount DF 'falls within the allowable range Gd in step S13, the process returns. Next, referring to the flowchart of FIG.
The subroutine "AF" of FIG.
The operation of 2 "will be described.

In this subroutine "AF2", the AF is performed by using the outputs of the first focus detecting section 15 and the second focus detecting section 43 together. Since the second focus detection unit 43 performs the AF such that the contrast of the video signal itself captured by the CCD 24 becomes a peak, the second focus detection unit 43 has higher accuracy than the focus detection accuracy of the first focus detection unit 15.

On the other hand, the hill-climbing method is generally inferior in AF speed to the phase difference method. Therefore, when the output of the first focus detection unit 15 is out of the predetermined focusing vicinity range, the first focusing
AF is performed based on the output of the focus detection unit 15, and if the output of the first focus detection unit 15 is within a predetermined focus vicinity range, the second
By performing AF using the output of the focus detection unit 43,
AF in which both the AF speed and the AF accuracy are achieved is performed.

First, in step S21, the lens microcomputer 31 outputs a control signal to the first focus detection unit 15 to execute focus detection. And step S
At 22, a defocus amount is calculated from the output of the first focus detection unit (phase difference method) 15, and the defocus amount DF is calculated.
Is corrected by the correction data Hd from the camera body already stored in the RAM 31b in the lens microcomputer 31.
The correction is performed based on the above equation (1).

The correction data Hd is based on a correction value relating to the flange back of the camera body for the CCD, a focus position shift due to a difference in spectral sensitivity between the silver halide film and the CCD, and the presence or absence of an infrared cut filter of the CCD. It also includes a correction value such as a focus shift.

Next, in step S13, communication with the body microcomputer is performed, and the second focus detection value is received. In step S14, it is determined whether or not focus is achieved based on the second focus detection value. Here, in the case of focusing, the process returns.

Here, based on the data transmitted from the camera body and stored in the RAM 31c in the lens microcomputer 31 and related to the permissible focusing range, the focusing in terms of the defocus amount at the time of the focus detection by the first focus detection unit 15 is performed. Allowable range Gd
Is calculated, and the corrected defocus amount DF ′ is compared with the allowable range Gd to determine whether or not it is within the allowable range Gd.

In the case of the camera body 1a for CCD photographing,
The required focus adjustment accuracy is determined by the pixel pitch of the CCD 24. Therefore, when the focus is determined by detecting the defocus amount by the phase difference detection method, an allowable focus range must be set according to the pixel pitch of the CCD 24 mounted on the camera body 1a. EEPROM 41d in body microcomputer 41 of camera body 1a
Stores data corresponding to the pixel pitch p of the CCD 24 and is transmitted to the lens microcomputer 31 when communicating with the lens microcomputer 31.

The lens microcomputer 31 calculates the permissible focusing range Gd by, for example, the following equation (3) based on the pixel pitch data p and the FNO of the photographing optical system. Gd = FNO × 2 · p (3) On the other hand, if it is determined in step S24 that the image is out of focus, the process proceeds to step S25, where the first focus detection value is set to the predetermined in-focus range. It is determined whether it is Sd. The predetermined range Sd is a range Gd that can be regarded as focused.
, And is set wider. This is because, in order to improve the focus adjustment speed, the focus adjustment based on the faster first focus detection value is performed outside the range of Sd, and the focus adjustment based on the second focus detection value with higher accuracy is performed within the Sd range. This is to realize a high-speed and high-accuracy focus adjustment operation.

If it is determined in step S25 that the first focus detection value is within the range of Sd, the flow advances to step S26 to select the second focus detection value. Further, the flow advances to step S27 to change the second focus detection value to the second focus detection value. Based hill climbing control is performed.

In this hill-climbing control, a focus detection operation is performed based on the second focus detection value transmitted from the body microcomputer to detect the focus state, and the driving speed of the focus adjustment lens,
An operation such as a driving direction is performed. Then, while moving the focus adjustment lens, control is performed such that the focus adjustment lens is located at a position where the second focus detection value reaches a peak.

If it is determined in step S25 that the first focus detection value is within the predetermined range Sd, the flow advances to step S28 to select the first focus detection value. Next, in step S29, a lens drive amount calculation is performed from the first focus detection value, and the focus adjustment lens is driven based on the calculation.

The above operations are repeatedly executed, and the process returns when the second focus detection value is in the focused state in step S24. Next, the operation of the subroutine "AF3" in FIG. 8 by the lens microcomputer 31 will be described with reference to the flowchart in FIG.

First, in step S31, the lens microcomputer 31 outputs a control signal to the first focus detection unit 15 to execute focus detection. And step S
At 32, the defocus amount is calculated from the output of the first focus detection unit (phase difference method) 15, and the defocus amount DF is calculated.
Is corrected based on the above equation (1) by the correction data Hd from the camera body 1b already stored in the RAM 31c in the lens microcomputer 31.

Next, in step S33, communication is performed with the body microcomputer 61, and the third focus detection value is received.
The third focus detection value indicates a defocus amount which is a focus detection result by the third focus detection unit (phase difference method) 53 in the camera body 1b.

As described above, since the first in-lens focus detection section 15 is set to have characteristics according to the type of the interchangeable lens 4, it is higher than the third focus detection section 53 in the camera body 1b. Accurate focus detection is possible.
On the other hand, the third focus detection unit 53 in the camera body 1b
Is set so that AF can be performed in all the interchangeable lenses 4 that can be mounted on the camera body 1b for photographing a silver halide film, so that the characteristics such as focus detection accuracy and the like can be adjusted by the first focus detection unit. Inferior to 15. But the first
Since the focus detection unit 15 performs highly accurate focus detection, the third focus detection unit 53 is advantageous in that the calculation time is shorter.

In consideration of such advantages and disadvantages, the output of the third focus detection unit 53 is selected at a higher speed outside the predetermined in-focus area, and in the predetermined in-focus area, a higher-precision output is selected. The output of one focus detection unit 15 is selected, and focus adjustment is performed.

In step S34, the first focus detection value is compared with a focus permission determination value Gd based on data transmitted from the camera body 1b, and it is determined whether or not focus is achieved. Here, in the case of focusing, the process returns.

On the other hand, if out of focus, the process proceeds to step S35, where it is determined whether the third focus detection value is already within the predetermined determination value Sd transmitted from the camera body 1b. If the third focus detection value is within the Sd range, the first focus detection value is selected in step S36,
In step S38, drive control of the focus adjustment lens is performed based on the first focus detection value.

In step S35, the third
If it is determined that the focus detection value is not within the predetermined range Sd, the process proceeds to step S37, where a third focus detection value is selected, and the focus adjustment lens is driven based on the third focus detection value.

As described above, the output of the third focus detection unit 53 is selected at a higher speed when it is not in the in-focus area (within Sd). Since the output of the single focus detection unit 15 is selected, AF that achieves both high speed and high accuracy can be performed.

FIG. 11 shows a camera body 1 for photographing a CCD.
4 is a flowchart illustrating a main routine of the body microcomputer 41 in FIG. Power switch (not shown)
Is turned on or a battery is inserted, the body microcomputer 4
1 is started, and the sequence program stored in the internal ROM 41b is executed.

Then, in step S41, each block in the camera body 1a is initialized. Next, in step S42, mutual communication with the lens microcomputer 31 is performed. In this mutual communication, the type of the camera body, the type of the focus detection value transmitted from the camera body, and the focus detection parameter are transmitted to the lens microcomputer 31. As the focus detection parameter, the first focus detection unit 1 in the lens
5, the data relating to the in-focus permissible range when the AF operation is performed, and the flange back displacement data of the camera body for CCD photographing.

Next, in step S43, the 1RSW 47 which is turned on by depressing the release button in the first stage
Is detected, and the process stands by until the 1RSW 47 is turned on. When the 1RSW 47 is turned on, the body microcomputer 41 sends an AF signal to the lens microcomputer 31.
Is transmitted.

At this time, communication with the lens microcomputer 31 is performed at the communication timing shown in FIG.
4 waits for the generation of the vertical synchronization signal VD. During the period of the vertical synchronization signal VD, the lens microcomputer 3
1, an AF command is transmitted.

In this case, upon receiving the AF command, the lens microcomputer 31 in the interchangeable lens 4 executes the subroutine "AF2" in FIG. 9 as described above. Then, in step S46, the level of the high-frequency component of the video signal is detected at a predetermined sampling interval in the second focus detection unit 43 in the camera body 1a. The second created by observing a change in the detection level
The focus detection value is transmitted to the lens microcomputer 31.

In step S47, the lens microcomputer 31
Is determined. Here, when it is determined that the focus is achieved, 2RSW4 is set in the subsequent step S48.
It is determined whether or not 8 has been turned on. And 2RSW
If the switch 48 is turned on, the process proceeds to step S49 to perform exposure.

In the exposure operation, the CCD 24 is driven based on the video signal output from the video signal processing unit 42 based on the electronic shutter speed calculated by the photometry operation in the photometry unit 45 to perform exposure. Then, in order to prevent smearing of the CCD 24, an aperture command is transmitted to the lens microcomputer 31, the aperture 12 is closed, and the CCD 24 is shielded from light.

On the other hand, if the image is out of focus in step S47, the flow returns to step S43 to return to the lens microcomputer 31.
, The AF command and the second focus detection value are repeatedly transmitted.

After the exposure of the CCD 24 is completed, step S5
At 0, the video signal is read out with the CCD 24 kept in the light-shielded state, subjected to processing such as A / D conversion and compression, and then stored in the memory of the recording unit 44. Then, a command to open the aperture is transmitted to the lens microcomputer 31 and the aperture 12 is opened.

Thus, a series of photographing operations is completed. Next, the contrast method and the hill-climbing control will be described.
First, the operation of the second focus detection unit 43 will be described with reference to FIG.

The video signal processing section 42 in the camera body 1a
Then, the image formed on the CCD 24 by the photographing optical system 11 is converted into a video signal. Then, a predetermined high-frequency component is extracted from the video signal in the focus detection area (see FIG. 6B) and integrated to generate a second focus detection value.

The second level which is the level of the high frequency component of the video signal
As shown in FIG. 13, the focus detection value increases sharply as the sharpness of the image formed on the CCD 24 increases, that is, as the focus adjustment lens 11a approaches the focus.
The peak P is reached when the image on D24 is in focus.

The second focus detection value is referred to while moving the focus adjustment lens 11a, and when the second focus detection value increases, it is determined that the focus adjustment lens 11a is moving in a direction approaching focusing. Is determined. Conversely, when the level of the selected frequency component is falling, it is determined that the focus adjustment lens 11a is moving in a direction away from focusing.

Then, the top of the mountain is determined based on the amount of change in the second focus detection value, and the focus adjusting lens 11a is stopped at the point where the peak value is reached. Alternatively, when it is within a predetermined range from the peak value, it is determined that the image on the CCD 24 is in focus. The focus allowable range is, for example, as shown in FIG.
Is in focus.

Next, the operation of the camera body for photographing a silver halide film will be described. FIG. 14 is a flowchart showing a main routine of an operation control procedure of the body microcomputer 61 of the camera body 1b shown in FIG.

First, in the body microcomputer 61, when the operation is started by inserting the battery or turning on the power switch, first, each part in the camera body 1b is initialized, and the EEPRO
Processing such as reading various correction data stored in advance in the M61d and developing it in the RAM 61c is performed. Further, the third focus detection unit 53 is activated, and the focus detection operation is started.

Next, in step S62, communication with the lens microcomputer 31 is performed, and EE in the body microcomputer 61 is performed.
The correction data (focus correction data, focus allowable range data, etc.) stored in the PROM 61 d is stored in the lens microcomputer 3.
1 is sent.

The camera body for photographing a silver halide film includes:
There are a camera body for 135 film and a camera body for IX240 film, and the required AF accuracy is different because the film size is different. In the body microcomputer 61, the focusing allowable range data D corresponding to the type of the film is
It is stored in the EPROM 61d or the like, and is transmitted to the lens microcomputer 31 when communicating with the lens microcomputer 31.

In the subsequent step S63, the process waits until the 1RSW 68 is turned on. If it is turned on, the process proceeds to step S64.
Then, the photometric unit 66 is operated to perform a photometric operation of measuring the subject luminance, and the photometric value is stored in the RAM 61c. Next, in step S65, the lens microcomputer 31
An AF command is transmitted. Lens microcomputer 3
In 1, when the AF command is received, the AF operation is performed (see the flowchart of FIG. 7).

In step S 66, a focus detection calculation is performed based on the output of the third focus detection unit 53, and the third focus detection value is transmitted to the lens microcomputer 31. Upon receiving the third focus detection value, the lens microcomputer 31 performs an AF operation (see the flowchart in FIG. 7).

As a result of the AF operation, in step S67, it is determined whether or not focusing has been performed with reference to the focusing signal transmitted from the lens microcomputer 31. If the camera is not in focus, the process returns to step S63 and the AF operation is repeated until the camera is in focus. On the other hand, if the camera is in focus, it is determined in subsequent step S68 whether or not the 2RSW 69 is on.

If it is determined in step S68 that the 2RSW 69 has not been turned on, the process returns to step S63. On the other hand, if it is turned on, aperture data and an aperture command are transmitted to the lens microcomputer 31 in accordance with the aperture value determined based on the photometric value obtained in step S64. In the lens microcomputer 31, the aperture 12 is driven and set to a predetermined aperture value based on the aperture data (see the flowchart in FIG. 7).

In step S69, the main mirror 51 is retracted from the photographing optical path by the mirror driving unit 63, and the shutter 58 is transmitted via the shutter driving unit 63 based on the shutter speed value determined according to the photometric value. Is driven to perform an exposure operation.

When this exposure operation is completed, step S7
Then, the film 59 taken by the film drive unit 65 is wound up and fed to the next frame position. Thus, a series of photographing operations ends. Then, the process proceeds to a step S71, where the display operation of the LCD, the LED and the like of the display section 67 is controlled.

As described above, in the first embodiment, the type of the camera body attached to the interchangeable lens is determined, and the focus detection method is changed according to the type of the camera body. Therefore, it is possible to execute an optimum focus adjustment method for various bodies, and it is possible to improve focus adjustment accuracy and speed.

Next, a second embodiment of the present invention will be described. In the second embodiment, the program “main routine 2” of the lens microcomputer 31 in FIG. 15 and the subroutine “AF4” in FIG. 16 correspond to each other. Other configurations and operations are the same as those in the first embodiment. Therefore, the description is omitted.

FIG. 15 is a flowchart for explaining the operation of the program "main routine 2" of the lens microcomputer 31. In step S81, the operation is started to initialize each block in the interchangeable lens 4, and communication with the body microcomputer is performed. The type of the camera body, the type of the focus detection value transmitted from the camera body, and the focus Detection parameters are determined. At this time, the camera body side shooting mode (for example, continuous shooting, single shooting mode, etc.), AF
The setting of the mode (single AF, continuous AF, etc.) is determined.

Then, in step S82, it is determined whether the command transmitted from the body microcomputer is an AF command or another command. If the command is an AF command, the process proceeds to step S83. If the command is another command, the process proceeds to step S94.

In step S83, it is determined whether the camera body on which the interchangeable lens 4 is mounted is version 1.
Here, if the camera body is version 1, the process proceeds to step S84, where a subroutine "AF1", which is an AF sequence when there is no focus detection unit in the camera body, is executed. As a result, lens drive control is performed based on the defocus amount that is the focus detection value of the first focus detection unit in the lens.

If it is determined in step S83 that the version is not version 1, it is determined in step S85 whether or not the version is version 2. Here, if the version is 2, the process proceeds to step S90, and it is determined whether the AF mode of the camera body is the continuous AF mode. Next, in step S91, it is determined whether the shooting mode is the continuous shooting mode.

If it is determined in steps S90 and S91 that the current mode is the continuous AF mode or the continuous shooting mode, the flow advances to step S93 to execute the subroutine "AF1". Thereby, lens drive control based on the defocus amount of the first focus detection unit (phase difference detection method) 15 in the lens is performed.

On the other hand, in steps S90 and S91, if neither of the above modes is set, the flow advances to step S90.
Proceeding to 92, a subroutine "AF2" is executed. Thereby, the first focus detection unit in the lens (phase difference detection method)
AF control is performed using both the lens drive control based on the defocus amount of No. 15 and the hill-climbing control using the focus evaluation value of the second focus detection unit 43 in the camera body.

If it is determined in step S85 that the current version is not version 2, that is, it is version 3, the flow advances to step S86 to execute the AF operation of the camera body.
It is determined whether the mode is the continuous AF mode. Next, in step S87, it is determined whether the shooting mode is the continuous shooting mode.

If it is determined in steps S86 and S87 that the current mode is the continuous AF mode or the continuous shooting mode, the flow advances to step S89 to execute the subroutine "AF4". Thus, the AF operation by the lens drive control based on the defocus amount of the third focus detection unit (phase difference detection method) 53 in the camera body is performed. This will be described later.

On the other hand, the above steps S86 and S87
If the mode is neither the continuous AF mode nor the continuous shooting mode, the flow advances to step S88 to execute the subroutine "AF3". Thereby, the first in the lens
The lens drive control based on the defocus amount of the focus detection unit (phase difference detection method) 15 and the lens drive control based on the defocus amount of the third focus detection unit (phase difference detection method) 53 in the camera body are used together. AF control is performed.

Then, in step S95, communication with the body microcomputer is performed, acquisition of a command from the body microcomputer, and transmission of a focusing signal to the body microcomputer.

If it is determined in step S82 that the command is not an AF command, that is, if the command is an aperture control command, the flow advances to step S94 to perform aperture control, and then to step S95.

Next, the operation of the subroutine "AF4" of the lens microcomputer 31 will be described with reference to the flowchart of FIG. In step S101, communication is performed with the body microcomputer 61, and a third focus detection value of the third focus detection unit (phase difference detection method) 53 in the body is received. Next, in step S102, it is determined whether the third focus detection value is in focus.

Here, in the case of in-focus, the process returns. In the case of out-of-focus, the flow advances to step S103 to drive the lens based on the third focus detection value. Then, the above step S10
The above operation is repeated until focusing is achieved in step 2.

As described above, when the continuous AF mode or the continuous shooting mode is set, the responsiveness is required. Therefore, in the version 2, the speed of the first focus detection unit is higher than that of the second focus detection unit. By performing the AF operation based only on the focus detection result, it is possible to perform an AF operation that follows a moving subject or the like with a reduced time lag.

In this case, instead of not observing the detection result of the second focus detection unit 43, in order to secure the AF accuracy, the focus allowable range of the first focus detection unit 15 is set within a range that does not impair the high speed. May be narrowed, or the accuracy may be improved by an averaging process.

Similarly, in the case of version 3,
When the continuous AF mode or the continuous shooting mode is set, the responsiveness is required. Therefore, the AF operation is performed based only on the focus detection result of the third focus detection unit having higher speed than the first focus detection unit. By doing so, it is possible to perform AF that follows a moving subject or the like while reducing the time lag.

In this case, instead of checking the detection result of the first focus detection unit 13, the allowable focus range of the third focus detection unit 43 may be narrower than usual in order to ensure AF accuracy. As described above, in the second embodiment,
Determines the type of camera body attached to the interchangeable lens,
The focus detection method is changed according to the type of the camera body, and the focus detection method is changed according to the operation mode such as the photographing mode and the AF mode of the camera body. , An optimum focus adjustment method is executed, and focus adjustment accuracy and speed can be improved.

Next, a third embodiment of the present invention will be described. FIG. 17A is a diagram illustrating an example in which the first focus detection unit 15 in the interchangeable lens 4 has a plurality of focus detection areas. In FIG. 17A, for example, focus detection areas A, B, and C are shown in a photographing screen 81 of the camera body 1b for photographing a silver halide film.

FIG. 17B is a diagram showing a photographing screen of the camera body 1a for CCD photographing and a focus detection area of the second focus detecting section in the camera body 1a. FIG. 17 (b)
2, a focus detection area 83 is shown in a photographing screen 82 of the camera body 1a for photographing a CCD.

The photographing screen 82 shown in FIG.
Is the same as the shooting screen 82 in FIG. This is because, for example, the cost of a CCD having the same size as a silver halide film is very high, and it is desired to use a small CCD with a low cost.

FIG. 18 is a flowchart for explaining the operation of the subroutine "AF2b" of the lens microcomputer 31 according to the third embodiment. The flowchart of FIG. 18 replaces the subroutine "AF2" in the above-described first embodiment. Other configurations and operations are the same as those in the above-described first embodiment, and thus description thereof is omitted.

At step S111, the lens microcomputer 3
By 1, a control signal is output to the first focus detection unit 15 to perform focus detection. Then, step S11
At 2, the defocus amount is calculated from the output of the first focus detection unit (phase difference method) 15, and the defocus amount DF is calculated.
Is corrected by the correction data Hd from the camera body already stored in the RAM 31c in the lens microcomputer 31.
The correction is made based on the above equation (1).

The correction data Hd includes a correction value relating to the flange back of the camera body for CCD photographing, a focus position shift due to a difference in spectral sensitivity between the silver halide film and the CCD, and the presence or absence of an infrared cut filter of the CCD. The correction value of the focus position deviation due to the above is also included.

Next, in step S113, communication with the body microcomputer 61 is performed, and the second focus detection value is received. In step S114, the focus detection area data transmitted from the body microcomputer 61 and usable by the first focus detection unit 15 in the interchangeable lens 4 due to the difference in the size of the CCD is referred to.

As a result, in the case of the camera body for CCD photographing shown in FIG. 17B, it is confirmed that the first focus detection areas B and C in the interchangeable lens 4 are out of the photographing screen 82 and cannot be used. On the other hand, the CCD shown in FIG.
In the case of a camera body for use, the first focus detection areas A, B, and C in the interchangeable lens 4 are all in the shooting screen 71 and can be used.

In step S114, if only the central focus area A of the first focus detection section 15 is usable, the flow advances to step S121 to determine whether or not the second focus detection value is in focus. If it is impatient, return. If out of focus, the process proceeds to step S122, and it is determined whether the central data A of the first focus detection value is within a predetermined defocus amount range.

Here, if within the predetermined range, the process proceeds to steps S123 and S124, and hill-climbing control based on the second focus detection value is performed. After that, the above step S12
The above operation is repeated until the second focus detection value becomes in focus at 1.

On the other hand, if it is determined in step S122 that the value is outside the predetermined range, the flow advances to step S125 to use the central data A of the first focus detection value. Then
In step S126, a lens drive amount is calculated based on the data, and the lens of the focus adjustment lens 11a is driven. Thereafter, the above operation is repeated until the second focus detection value becomes in focus in step S121.

If it is determined in step S114 that the entire focus area of the first focus detection unit 15 is usable, the flow advances to step S115 to select the closest data from the first focus detection values A, B, and C. You.

Next, in step S116, it is determined whether or not the selected area is the center A. Here, when the center A is selected, the above-described step S121 is performed.
Proceed to. On the other hand, if it is not the center, the process proceeds to step S117, and it is further determined whether or not the area is the left area B. Here, if it is the left area B, the process proceeds to step S118. Then, the left focus area B of the first focus detection value is compared with a predetermined allowable focus range Gd (see the above equation (3)).
If it is in focus, it returns. If out of focus, the process proceeds to step S120, in which the lens driving amount based on the left area B of the first focus detection value is calculated, and the lens is driven.

If it is determined in step S117 that the area is not the left area, the flow advances to step S119 to determine whether or not the right area C of the first focus detection value is in focus. If it returns. On the other hand, if it is out of focus in step S119, the process proceeds to step S120, where the lens drive amount based on the right area B of the first focus detection value is calculated, and the lens is driven.

Thereafter, step S118 or S
At 119, the above operation is repeated until the first focus detection value is in focus in each focus detection area. As described above, even when the size of the imaging medium differs depending on the camera body and the usable focus detection area of the focus detection unit in the interchangeable lens differs, the focus detection area is detected and selected and used. Accurate focus adjustment can be performed.

In the above-described method for selecting the three regions, the closest selection is used. However, the present invention is not limited to this. For example, a selection closest to the previous detection result may be selected. According to the above embodiment of the present invention, the following configuration can be obtained.

(1) The camera body has a focus detecting means for detecting a focus state and a camera body information generating means for generating information unique to the camera body. The focus adjusting operation is performed in the interchangeable lens. Having control means for controlling,
The focus detection output detected by the focus detection unit and the body information output of the camera body information generation unit are sent from the camera body side to the interchangeable lens side, and the focus detection output and the body information output are output from the interchangeable lens side. A camera system, wherein a control method of a focus adjustment operation is changed based on the control method.

(2) In a camera body to which an interchangeable lens can be attached and detached, focus detection means for detecting a focus state, camera body information generation means for generating information unique to the camera body, and detection by the focus detection means And transmitting means for transmitting the focus detection output and the body information output of the camera body information generating means to the interchangeable lens. Focus adjustment is performed on the interchangeable lens side based on the focus detection output and the body information output. A camera body characterized by changing an operation control method.

(3) In an interchangeable lens that is detachable from a camera body and includes a focus detection unit and a camera body information generation unit that generates information unique to the camera body, a focus detection signal transmitted from the camera body side and the camera Receiving means for receiving body-specific information, control means for determining a focus state based on the focus detection signal and camera body-specific information received by the receiving means, and changing a control method of a focus adjustment operation; An interchangeable lens comprising:

(4) The interchangeable lens further has a driving means for driving the focus adjusting lens, and the control means drives the lens driving means based on the focus detection signal and information unique to the camera body. The camera system according to claim 1, wherein

(5) In a camera body to which an interchangeable lens is detachable, a camera body information generating means for generating information unique to the camera body and a control method of a focus adjustment operation performed by the interchangeable lens are set. Transmitting means for transmitting an output of the camera body information generating means to the interchangeable lens.

(6) In a camera body to which an interchangeable lens is detachable, focus detecting means for detecting a focus state of a photographing optical system, camera body information generating means for generating information unique to the camera body, and the interchangeable lens Transmitting means for transmitting the output of the focus detecting means and the output of the camera body information generating means to the interchangeable lens in order to set a control method of the focus adjusting operation performed by the camera body. .

(7) In a camera system having a camera body and an interchangeable lens that can be attached to and detached from the camera body, the camera body includes camera body information generating means for generating information unique to the camera body, and photographing optics. A focus detecting means for detecting a focus state of the system, wherein the interchangeable lens includes control means for controlling a focus adjusting operation, and the interchangeable lens includes an output of the camera body information generating means and the focus detecting means. A control method of a focus adjustment operation based on the output of the camera system.

(8) The control method of the focus adjustment operation is as follows.
The camera system according to the above (7), which is one of a phase difference detection method and a hill-climbing control. (9) When the camera body is a silver halide body that can be exposed to a silver halide film, the focus adjustment operation is controlled by a phase difference detection method, and when the camera body is a digital body that can capture an image on an imaging device, The camera system according to (7), wherein the control of the focus adjustment operation is performed by hill-climbing control.

[0144]

As described above, according to the present invention, the type of the body attached to the interchangeable lens is determined, and the control method of the focus adjustment operation in the interchangeable lens is changed according to the type of the body. It is possible to cope with bodies having different focus detection methods. In addition, since it is not necessary for all types of bodies to have the same focus detection device, it is possible to realize cost reduction.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the concept of a camera system and an interchangeable lens according to the present invention.

FIG. 2 is a diagram showing an optical path diagram of a camera to which the camera system according to the first embodiment of the present invention is applied.

FIG. 3 is a block diagram showing an electrical configuration inside the interchangeable lens 4 and the camera body 1a of FIG. 2;

FIG. 4 is an optical path diagram of a silver halide film photographing body and an interchangeable lens to which the camera system according to the first embodiment of the present invention is applied.

FIG. 5 is a block diagram showing an electrical configuration inside the interchangeable lens 4 and a camera body 1b for photographing a silver halide film in FIG. 4;

FIG. 6 shows a focus detection area in a shooting screen,
(A) is a diagram showing an area of a first focus detection unit, (b) is a diagram showing an area of a second focus detection unit, and (c) is a diagram showing an area of a third focus detection unit.

FIG. 7 is a flowchart illustrating a control operation “lens main routine” by the lens microcomputer 31;

FIG. 8 is a flowchart illustrating an operation of a subroutine “AF1” in FIG. 6 by the lens microcomputer 31;

FIG. 9 is a flowchart illustrating an operation of a subroutine “AF2” in FIG. 7 by the lens microcomputer 31;

FIG. 10 is a flowchart illustrating an operation of a subroutine “AF3” in FIG. 8 by the lens microcomputer 31.

FIG. 11 is a flowchart showing a main routine of a body microcomputer 41 in the camera body 1a for CCD photographing.

FIG. 12 is a timing chart illustrating the timing of vertical synchronization signal VD and communication.

FIG. 13 is a diagram illustrating an operation of a second focus detection unit 43.

14 is a flowchart showing a main routine of an operation control procedure of a body microcomputer 61 of the camera body 1b shown in FIG.

FIG. 15 is a flowchart illustrating the operation of a program “main routine 2” of the lens microcomputer 31.

FIG. 16 shows a subroutine “AF” of the lens microcomputer 31.
It is a flowchart explaining operation | movement of 4 ".

17A is a diagram illustrating a first focus detection unit 1 in the interchangeable lens 4. FIG.
FIG. 5 shows an example in which 5 has a plurality of focus detection areas;
FIG. 2B is a diagram showing a photographing screen of the camera body 1a for CCD photographing and a focus detection area of a second focus detection unit in the camera body 1a.

FIG. 18 shows a lens microcomputer 3 according to a third embodiment.
9 is a flowchart illustrating an operation of a first subroutine “AF2b”.

[Explanation of symbols]

1a camera body (for CCD photography), 1b camera body (for silver halide film photography), 2a, 2b focus detection section, 3a, 3b camera body information generation section, 4 interchangeable lens, 5 control section, 7, 8, 9 electricity Reference contact point, 11 shooting optical system, 11a focus adjusting lens, 12 aperture, 15 first focus detection unit, 24 image pickup device (CCD), 26 finder optical system, 31 lens microcomputer (lens microcomputer), 31a CPU (central processing) 31b ROM, 31c RAM, 31d EEPROM, 31e A / D converter (ADC), 32 AF sensor, 33 aperture control unit, 34 lens drive unit, 41, 61 body microcomputer, 41a, 61a CPU (central processing unit) 41b, 61b ROM, 41c, 61c RAM, 41d, 61d EE ROM, 41e, 61e A / D converter (ADC), 42 video signal processing unit, 43 second focus detection unit, 44 recording unit, 45 light measuring unit, 46 display unit, 47,68 first release switch (1RS
W), 48, 69 and second release switch (2RS
W), 51 main mirror, 53 third focus detection unit, 54 finder optical system, 58 shutter, 59 film, 62 AF sensor, 63 mirror drive unit, 64 shutter drive unit, 65 film drive unit, 66 photometry unit, 67 display Department.

Claims (3)

[Claims] 1. A camera system having a camera body and an interchangeable lens detachable from the camera body, wherein the camera body includes camera body information generating means for generating information unique to the camera body. A camera system, wherein the interchangeable lens includes control means for controlling a focus adjusting operation, and wherein the interchangeable lens sets a control method of the focus adjusting operation based on an output of the camera body information generating means. 2. The camera body further comprises focus detection means for detecting a focus state of a photographing optical system, wherein the interchangeable lens is configured to detect an output of the camera body information generation means and an output of the focus detection means. 2. The camera system according to claim 1, wherein a control method of a focus adjustment operation is set. 3. An interchangeable lens that can be attached to and detached from a camera body, comprising: receiving means for receiving information unique to the camera body transmitted from the camera body, based on the information unique to the camera body received by the receiving means. And a control means for setting a control method of the focus adjustment operation.