JP2000075347A - Camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform photometry by switching a photometric area in accordance with the kind of an image recording unit. SOLUTION: By transmitting data inherent to an image recording unit to a camera body side from the image recording unit side, the BCPU of the camera body switches the photometric range of a photometric sensor measuring the luminance of a subject based on the inherent data. Namely, when the image recording unit is a film back where film can be exposed, a photometric area 401 equivalent to a pattern A+B, a photometric area 402 equivalent to a pattern C+D and a photometric area 403 equivalent to a pattern E are used, and when the image recording unit is a CCD back B having a CCD image pickup element, a photometric area 405 equivalent to a pattern A, a photometric area 406 equivalent to a pattern B+C and a photometric area 407 equivalent to a pattern D are used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a camera system in which image recording units corresponding to various recording media can be mounted on a camera body.

[0002]

2. Description of the Related Art Conventionally, there has been known a camera system in which an image recording unit corresponding to various recording media can be mounted on a camera body. For example, JP-A-4-275534
Japanese Patent Application Laid-Open Publication No. H11-216, discloses a single-lens reflex camera to which an electronic still adapter device can be attached. In this method, photographing with a silver halide film and an image sensor can be selected according to a photographer's desire. In the camera disclosed in this publication, at the time of electronic imaging, the back cover is removed and an electronic still adapter device is mounted.

[0003] Also, JP-A-5-61098 discloses that
A silver halide camera to which a still video back can be attached is disclosed. The camera disclosed in this publication switches the control program of the automatic exposure control mode of the silver halide camera body from the control program of the automatic exposure control mode of the silver halide film to the automatic exposure control program for video back when the still video back is mounted. It has.

Japanese Patent Application Laid-Open No. 5-241235 discloses a camera having a replaceable back cover (still video back).
In addition, it is disclosed that an electric connection unit is provided between a camera and a back cover in a back cover for performing photographing using an imaging element.

[0005]

By the way, in a camera system in which image recording units corresponding to various recording media can be mounted on such a camera main body, depending on the type of recording medium used in the image recording unit. However, the size of the image recording area may be different.

For example, an image recording unit using an IX240 film has an image recording area of an IX240 film size. In the case of an image recording unit using a CCD image sensor, when an IX240 film size CCD image sensor is used, There is a problem that the cost increases. Another method is to use a reduction optical system such as a relay lens and use a CCD having a small size such as 1/2 inch, but the space cost of the reduction optical system becomes a problem.

Therefore, a CCD smaller than the IX240 film size is used without using a reduction optical system such as a relay lens.
A method using an image sensor is conceivable. In this case, since the size of the image recording area is different, it is necessary to switch the photometric area of the photometric sensor according to the size of the image recording area. However, such a technique is not disclosed in any of JP-A-4-275534, JP-A-5-61098, and JP-A-5-241235.

[0008] The optimum photometric method may differ depending on the type of the image pickup object used in the image recording unit. That is, when a CCD image sensor is used for the image recording unit, a photometric method (image sensor photometry) using image data from the image sensor can be considered. In addition, a method of measuring light using a light measuring sensor provided in a finder (in-F metering) is conceivable.

Here, in the case of the image sensor photometry, the displacement between the image sensor and the photometry sensor is smaller than that in the F-meter metering.
Further, since the position resolution to be detected (corresponding to the number of divisions of the photometric pattern) is high, highly accurate photometry can be realized. In particular,
If an image pickup device such as a CCD is used for the recording medium, the CCD
Are smaller in dynamic range than silver halide films. A / D conversion is performed on the image data to obtain finite-bit digital data. However, in the case of overexposure, a portion having a luminance exceeding the full bit is stuck to the full-bit luminance.
Causes overexposure. In the case of underexposure, since grayscale data is obtained because of finite bits of digital data, the shadow portion tends to stick to black. For this reason, overexposure and underexposure are severe, and highly accurate photometry is required. Conversely, as a demerit in the case of image sensor photometry, it is necessary to always perform image sensor photometry in order to quickly perform integration control of the image sensor after the release button is pressed. When there is no other photometric sensor, in order to properly perform the integration control (exposure) of the image sensor, integration of the image sensor is performed, and the next integration time is determined from the level of the obtained image data. Trial and error feedback control is required. Also, if the time lag from the pressing of the release button to the exposure is large, a shutter chance is missed, so that it is necessary to repeat photometry before the release button is pressed. Therefore, there is a disadvantage that the current consumption of the camera increases.

Therefore, it is necessary to switch the photometric method according to the type and specification of the image recording unit to be used. However, such a technique is disclosed in
-275534, JP-A-5-61098,
It is not disclosed in any of JP-A-5-241235.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and enables a photometry range to be changed according to the type of an image recording unit so that photometry can be performed. An object of the present invention is to provide a camera system capable of performing photometry in a photometry range. Another object of the present invention is to provide a camera system that can select an optimal photometry method and perform photometry according to the type of image recording unit.

[0012]

To achieve the above object, a camera system according to the first aspect of the present invention comprises:
A camera system including a camera body and an image recording unit detachable from the camera body, wherein the image recording unit is configured to store data unique to the image recording unit, and to store the unique data in the camera body. Transmitting means for transmitting to the camera body, the photometer means for measuring the brightness of the subject, receiving means for receiving the unique data from the transmitting means, and the unique data received by the receiving means Switching means for switching the light measuring range of the light measuring means based on the detected light.

That is, according to the camera system of the first aspect of the present invention, the data unique to the image recording unit is transmitted from the image recording unit to the camera main body, so that the camera main body has the unique data. Based on the data,
The photometric range of the photometric means for measuring the subject brightness is switched. Therefore, the photometry can be performed by switching the photometry range in accordance with the type of the image recording unit, so that the photometry can be performed in the photometry range corresponding to the size of the image recording area of the image recording unit.

According to a second aspect of the present invention, there is provided a camera system including a camera body and an image recording unit detachable from the camera body, wherein the image recording unit is unique to the image recording unit. Storage means for storing the unique data, and transmission means for transmitting the unique data to the camera body, wherein the camera body receives the unique data from the transmission means, and the reception means And selecting means for selecting one from a plurality of photometric means for measuring the subject brightness based on the unique data received at step (b).

That is, according to the camera system of the second aspect of the present invention, the data unique to the image recording unit is transmitted from the image recording unit to the camera main body, so that the camera main body has the unique data. Based on the data,
One is selected from a plurality of photometric means for measuring subject brightness. Therefore, the photometry can be performed by selecting an optimal photometry method according to the type of the image recording unit.

A camera system according to a third aspect of the present invention is a camera system including a camera body and an image recording unit detachable from the camera body, wherein the image recording unit is unique to the image recording unit. Storage means for storing the unique data, and transmission means for transmitting the unique data to the camera body, wherein the camera body is configured to measure the subject brightness, and to store the unique data from the transmission means. Receiving means for receiving, a discriminating means for discriminating the image recording unit based on the unique data received by the receiving means, and a film back capable of exposing the image recording unit to a film by the discriminating means. Is determined, the photometry is performed by the photometry unit of the camera body, and the image recording unit is a CCD having an imaging unit. When it is determined that click is
And a photometric selection unit that performs photometry by using the imaging unit as a photometric unit.

That is, according to the camera system of the third aspect of the present invention, the data unique to the image recording unit is transmitted from the image recording unit to the camera body, so that the camera body has the unique data. Based on the data,
It is determined whether the image recording unit is a film back capable of exposing a film or a CCD back having an image pickup means. In the case of a film back, photometry is performed by the photometry means of the camera body.
Photometry is performed by using the imaging means provided in the D-back as photometric means. Therefore, the photometry can be performed by selecting an optimal photometry method according to the type of the image recording unit.

[0018]

FIG. 1 shows a camera system according to an embodiment of the present invention, in which an interchangeable lens 20 and one of various image recording units are mounted on a camera body 1. FIG. It is a simplified sectional view.

The camera body 1 includes a quick return mirror 2, a sub mirror 3, an AF detection module 4, a focal plane shutter 5, a finder mat 6, a pentaprism 7, an eyepiece 8, a condensing lens 9 for a photometric sensor, Photometry sensor 10, finder field frame LCD
11, a body-side lens mount 12, and a body-side image recording back mount 13 are provided.

The quick return mirror 2 is an up-down type half mirror. In the mirror-down state of the quick return mirror 2, 50% of light rays are reflected,
Sends 50% of the light to the sub-mirror 3
Send to the side. When the quick return mirror 2 is in the mirror-up state, 100% of the light is sent to the image recording unit.

The sub mirror 3 is a mirror for sending a light beam to the AF detection module 4. The sub-mirror 3 is a half mirror like the quick return mirror 2, and sends 50% of the light to the AF detection module 4 and sends 50% of the light to the image recording unit. That is,
The reason is that 25% of the light beam is sent to the image recording unit side because the photometry method using an image sensor needs to be performed in a mirror-down state. Must be sent to the recording medium.

The AF detection module 4 is an AF detection module for detecting a TTL phase difference. The AF detection module 4 includes a field mask 60 for narrowing an incident light beam,
Infrared cut filter 61 that cuts the infrared light component included in the incident light, condenser lens 62 that collects the light flux, total reflection mirror 63 that totally reflects the light flux, separator diaphragm 64 that limits the light flux, and separator that re-images the light flux Lens 6
5, and an AF sensor 66 comprising a photoelectric conversion element array and a processing circuit thereof. The AF sensor 6
6 will be described later with reference to FIG.

The detailed structure of the photometric sensor 10 will be described later with reference to FIG. Further, the details of the finder field frame LCD 11 for switching the field mask and the AF target mark in the finder are also described.
This will be described later with reference to FIGS.

The body-side lens mount 12 is provided on the interchangeable lens 20 side including the photographing lens 21, the aperture mechanism 22, and the photographing lens 23, and is mounted on the interchangeable lens-side lens mount 2.
4 and the interchangeable lens 20 is mounted on the camera body 1.

The body-side image recording back mount 13 is a mount for mounting an image recording unit. The image recording unit 30 (hereinafter, referred to as a film back) is a unit that can use an IX240 film, and an IX240 film 31 is loaded in the film back 30. Note that reference numeral 32 in FIG.
Is a film-back-side image recording back mount to be mounted on the camera body 1.

The image recording unit 40 (hereinafter referred to as CC)
D back A) is IX240 film size C
A unit that can use a CD. The CCD back A4
0 contains an IX240 film size CCD 41 and an optical filter 42 in which an infrared cut filter and an optical low-pass filter are set. The pixel size of the CCD 41 is 4 million pixels.

The image recording unit 50 (hereinafter, CC)
D-pack B) is a 2/3 inch CCD
Is a unit that can be used. The CCD back B50 has a built-in 2 / 3-inch CCD 51 and an optical filter 52 in which an infrared cut filter and an optical low-pass filter are set. In addition,
The pixel size of the CCD 51 is 1.4 million pixels.

Here, the film back 30 and the CCD back A 40 and the CCD back B 50 have different flange lengths because the space required for the optical filter is different.

FIG. 2 is a diagram showing an electrical configuration in a state where the film back 30 is mounted. Camera body 1
Includes a power supply battery 100 in the body, a power supply SW 101, a DC / DC converter 102 for boosting, and a BC (microcomputer) for sequence control.
PU103, a photometric sensor 10 provided in the finder for photometry, a photometric processing circuit 105 for processing a photocurrent output from the photometric sensor 10, and a switch 1RSW10 which is turned on in the first stroke of the release SW.
6. 2RSW 107 which is a switch which is turned on in the second stroke of the release SW, front curtain control magnet 108 of the focal plane shutter, rear curtain control magnet 109 of the focal plane shutter,
A shutter control circuit 110 for driving and controlling the shutter 109;
AF sensor 66, AF sensor interface circuit 1
11, mirror S charge motor 11 for driving and controlling quick return mirror 2 and shutter charge mechanism
2. Mirror S charge control circuit 113 for driving and controlling mirror S charge motor 112, finder field frame LCD 11, finder field frame LCD control circuit 114,
Electrical contacts 115 of a lens mount between the camera body 1 and the interchangeable lens 20, and electrical contacts 116 of an image recording back mount between the camera body 1 and the image recording unit.
Is arranged.

The BCPU stores a ROM 103A in which a control program and the like are stored in advance, and data unique to the image recording units communicated from the image recording units 30, 40, and 50 as described later in detail. A RAM 103B is provided.

The output voltage VE of the power supply battery 100
Is used as a power source of a power system such as a motor, and DC /
The output voltage VCC of the DC converter 102 is used as an IC power supply.

The interchangeable lens 20 includes a lens CPU.
LCPU150, LD (lens drive) for moving and focusing the lens inside the interchangeable lens
Motor 151, an LD motor control circuit 152 for controlling the driving of the LD motor 151, an LD pulse detecting circuit 153 for monitoring the driving amount of the LD motor 151, the aperture mechanism 22, and a stepping for driving the aperture mechanism 22 A motor 154 and a stepping motor control circuit 155 for driving and controlling the stepping motor 154 are provided.

A film back 30, which is an image recording back for photographing using the IX240 film cartridge, has an FCPU 200, which is a CPU for controlling each part in the film back, and a set mode. (For example, switching of C / H / P) and the like, a display control circuit 202 for driving and controlling the display element 201, and a data disk PR for reading a data disk on an IX240 film cartridge. (Photo reflector) 203, a data disk PR processing circuit 204 for processing an output signal from the data disk PR203, rotation of a data disk on an IX240 film cartridge, feeding, winding, and winding of a film from the IX240 film cartridge. Return, VEI set Winding and rewinding motor 205 for performing, winding and rewinding control circuit 206, for controlling the return winding-winding of the film, film for reading the perforations provided on the film PR2
07, a film PR processing circuit 208 for processing an output signal from the film PR207, a cartridge lid open / close detection SW 209, and a RW for manual rewinding
An SW 210 and a print size switching operation member 211 for switching the print size (C / H / P) are provided.

The FCPU 200 has the FCPU2
A ROM 200A in which a control program of 00 and data unique to the film back 30 are stored in advance.

As shown in FIG. 3, the CCD back A 40 has a CPU 250 in the CCD back A, an image monitor 251 for confirming captured image data, and an image for driving and controlling the image monitor 251. Monitor control circuit 252, power supply battery 25 loaded in CCD back A
3. DC / DC converter 254, CCD image sensor 255 having 4 million pixels as CCD 41 of IX240 film size, CCD control circuit 256 for driving and controlling CCD image sensor 255, image from CCD image sensor 255 An image processing circuit 25 that performs processing such as A / D conversion, image compression, and color conversion on analog data.
7 and an image recording circuit 258 for recording the image data output from the image processing circuit 257 on an image data recording medium 259.

Here, the CPU 250 includes the CPU
A ROM 250A in which a control program of the control unit 250 and data specific to the CCD back A40 are stored in advance is built in.

Incidentally, in the CCD back A40,
Since the current consumption of the CCD image sensor 255 is large, the power battery 2 is provided separately from the power battery 100 inside the camera body.
53 are loaded. As the power supply battery 253, a secondary battery can be used. The DC / DC converter 254 outputs two types of outputs VCC1 and V2.
CC2 is obtained, VCC1 is output to the CPU 250 and the CCD image sensor 255, and VCC2 of high voltage is output to the CCD image sensor 255.

As shown in FIG. 4, a CPU 300 in the CCD back B, an image monitor 301 for confirming photographed image data, and an image for driving and controlling the image monitor 301 are provided on the CCD back B 50 as shown in FIG. A monitor control circuit 302, a DC / DC converter 303 for outputting an output voltage to the CCD image pickup device 304, a 2 / 3-inch C
The CCD image sensor 304 having 1.4 million pixels as the CD 51, a CCD control circuit 305 for driving and controlling the CCD image sensor 304, and A / D conversion and image conversion of image analog data from the CCD image sensor 304 An image processing circuit 306 for performing processing such as compression and color conversion, and an image recording circuit 3 for recording image data output from the image processing circuit 306 on an image data recording medium 308
07 are arranged.

Here, the CPU 300 includes the CPU
A ROM 300A in which a control program of the controller 300 and data unique to the CCD back B50 are stored in advance is provided.

The CCD back B50 is connected to the C
Unlike the CD back A40, no power battery is built-in. Power is sent from the power battery 100 on the camera body side through the contacts of the image recording back mount.

Next, the details of the LCD 11 in the finder will be described. FIG. 5A is a diagram showing a state in which all segments of the LCD 11 in the finder are displayed. Here, the segments SE1 to SE4 are LCD segments for setting a field frame in the viewfinder. Segment SE
5 and SE6 are LCD segments for switching AF target marks in the viewfinder.

FIG. 5B shows a display mode of an H size (high-definition print size) in the IX240 film when the film back 30 is mounted, or a field frame corresponding to the mounting of the CCD back A40.
In this case, only the segment SE5 as the AF target mark is displayed.

Similarly, FIG. 5C shows a display mode of a field frame corresponding to the P size (panorama print size) on the IX240 film when the film back 30 is attached. In this case, the segment SE2 is used. SE3 and a segment SE5 as an AF target mark are displayed. FIG. 5D shows a film back 3.
0 shows a display mode of a field frame corresponding to the C size (classic print size) on the IX240 film when the IX240 film is mounted. In this case, segments SE1 and SE3 and AF
The segment SE5 as a target mark is displayed.

On the other hand, FIG. 5E shows a display mode of the field frame corresponding to the mounting of the CCD back B50. In this case, the segments SE1 to SE4 and the AF are displayed.
The segment SE6 as a target mark is displayed.

As shown in FIG. 6, the AF sensor 66 has a photoelectric conversion element array photodiode array (Lc).
h) 350 and the photoelectric conversion element array photodiode array (Rch) 351, and process the photoelectric conversion signals from the photoelectric conversion element array photodiode arrays 350 and 351, and process the processed photoelectric conversion signals into the AF sensor interface circuit 111. Processing circuit 3 for outputting to
52, and a sensor control circuit 353 controlled by a control signal from the AF sensor interface circuit 111.

Here, the sensor control circuit 353 controls the control signals RES and RES from the AF sensor interface circuit 111.
The operation of the internal circuit of the AF sensor 66 is controlled according to END and CLK. More specifically, the sensor control circuit 353 receives the signals RES and END from the AF sensor interface circuit 111, controls the start and end of the charge accumulation operation of the photodiode arrays 350 and 351 and the processing circuit 352, and The signal CLK from the AF sensor interface circuit 111 is received, and the accumulated signal, which is the subject image signal, is input from the terminal SDTA of the AF sensor 66 to A
Output to the F sensor interface circuit 111.
The AF sensor interface circuit 111 A / D converts the accumulated signal from the AF sensor 66 using a built-in A / D converter (not shown) in synchronization with the output of the signal CLK and stores the converted signal in a built-in RAM (not shown). A / D conversion data corresponding to the number m of diodes in the array is obtained.

The operation of the AF sensor 66 is disclosed in Japanese Patent Application No. 9-177497 filed by the applicant of the present invention, and the description thereof is omitted here. Next, the photometric sensor 10 will be described. As shown in FIG. 7A, the photometric sensor 10 is a five-divided photometric sensor,
It is composed of five divided photometric patterns: a circular pattern A, annular patterns B, C, and D surrounding the pattern in order, and a rectangular pattern E excluding these patterns A to D. Note that, in FIG.
The viewfinder field of view corresponding to the H size of the IX240 film (the field of view of the CCD back A40 is also equivalent thereto) is shown.

Here, such a photometric sensor 10 and a photometric processing circuit 105 for processing a photocurrent output from the photometric sensor include an internal equivalent circuit 10 as shown in FIG.
-1 and 105-1. Photometric processing circuit 105
Is a logarithmic compression amplifier 501 for logarithmically compressing photocurrents from the photometric patterns A to E of the photometric sensor 10 as shown in an internal equivalent circuit 105-1.
To 505 and a control signal from the BCPU 103,
A multiplexer 506 selects one of the logarithmic compression outputs VBVA to VBVE output from the logarithmic compression amplifiers 501 to 505 and outputs the selected signal to the BCPU 103 as VBV. The BCPU 103 sequentially converts the signal VBV from the multiplexer 506 into an A / D signal.
A / D conversion is performed by receiving the data at the conversion input port to obtain A / D conversion data BVA to BVE.

FIG. 7B shows a photometric pattern to be selected when the film back 30 is mounted on the image recording back. That is, in this case, the photometric regions 401, 402, and 403 are set with respect to the entire photographing visual field 400.
The evaluation photometry is performed according to the photometry data of the three regions. Photometric evaluation values BV401, B of photometric areas 401, 402, 403
V 402 and BV 403 are obtained by performing the calculation of the following equation inside the BCPU 103. Here, SA to SE are the areas of the light receiving surfaces of the patterns A to E, respectively.

BV 401 is a load average output of patterns A and B, and is obtained by the following equation. BV401 = 1log ₂ ((SA · 2 ^BVA + SB · 2 ^BVB )
/ (SA + SB)) BV402 is the weighted average output of patterns C and D, and is calculated by the following equation.

BV402 = log ₂ ((SC · 2 ^BVC + S
D · 2 ^BVD ) / (SC + SD)) Then, BV 403 is equal to BVE. FIG. 7C is a diagram showing a photometric pattern to be selected when the CCD back B50 is mounted on the image recording back. In this case, evaluation photometry is performed on the entire field of view 404 in accordance with photometry data of three photometric regions 405, 406, and 407. Photometry area 405, 406, 407
Of the photometric evaluation values BV405, BV406, and BV407 of
The calculation of the following expression is performed inside the BCPU 103 to obtain the value. BV4
05 is equal to BVA. BV406 is a pattern B,
This is the load average output of C, and is calculated by the following equation. _{BV406 = log 2 ((SB ·} 2 BVB + SC · 2 BVC)
/ (SB + SC)) BV407 is equal to BVD.

Next, the operation of the camera system having the above configuration will be described with reference to the BCPU 10 in the camera body 1 shown in FIG.
3 will be described according to the operation flowchart. That is, after the power is turned on, first, the BC (battery check) of the camera body 1 is performed (step S1).

Thereafter, communication with the image recording back is performed (step S2). By this communication, the BCPU 103 in the camera body 1 performs data communication with a CPU (hereinafter, referred to as a YCPU) in the image recording unit, and receives the following data from the image recording unit. Also, when the image recording unit is mounted on the camera body 1,
The BCPU 103 in the camera body 1 detects the attachment of the image recording unit and performs this communication processing.

In this communication processing, the BCPU 103
Is the ROM built in the YCPU in the image recording unit
As the data unique to the image recording unit stored in the image recording medium data, image recording area data,
AF detection field-of-view data, AF focusing threshold data, flange back length data, photometric method data, photometric pattern data, power supply data, ISO sensitivity data, and the like are sequentially received and stored in the internal RAM 103B.

Here, the "image recording medium data" is 4-bit data and is as follows. 0000: The meaning of the data is “IX240 film” The corresponding recording medium is “film back” 0001: The meaning of the data is “CCD back A” The corresponding recording medium is “CCD back A” 0010: The meaning of data The content to be performed is “CCD back B”. The corresponding recording medium is “CCD back B”.

The "image recording area data" is 4-bit data indicating a finder visual field mask switching specification, and is as follows. 0000: The meaning of the data is “IX240 film, C size” The corresponding recording medium is “film back” 0001: The meaning of the data is “IX240 film, H size” The corresponding recording medium is “film back, CCD back A "0010: The meaning of the data is" IX240 film, P size "The corresponding recording medium is" film back "0011: The meaning of the data is" 2/3 inch C "
CD size ”The corresponding recording medium is“ CCD back B ”0100 or later: undefined.

The "AF detection visual field data" is 2-bit data and is as follows. 00: The meaning of the data is “width 4 mm” The corresponding recording medium is “CCD back B” 01: The meaning of the data is “width 8 mm” The corresponding recording medium is “film back, CCD back A” 10 or later :undefined.

"AF focusing threshold data" is 00
It is 4-bit data of 00-1111, and the detection threshold data is represented by 4-bit data. Here, let the threshold data of the film back be TH1, the threshold data of the CCD back A be TH2, and the threshold data of the CCD back B be TH3.

“Flange back length data” is 0000
This is 8-bit data of 0000 to 11111111, and represents an increase in the flange back length on a film back basis with 8-bit data. That is, the flange back length data for the film back is 0, the flange back length data for the CCD back A is + FBA, and the flange back length data for the CCD back B is + FBB.

The "photometric method data" is 2-bit data and is as follows. 00: The meaning of the data is “photometry in the viewfinder / photometry sensor (inside F photometry)” The applicable recording medium is “film back, CCD back B” 01: The meaning of the data is “image sensor photometry” The recording medium to be used is “CCD back A” 10 or later: undefined.

The "photometric pattern data" is 2-bit data indicating which photometric pattern is to be used for photometry in the viewfinder and by the photometric sensor, and is as follows. 00: The meaning of the data is "pattern A in the center, pattern B + C in the middle, and pattern D in the outside". The corresponding recording medium is "CCD back B".
B, pattern C + D in the middle, pattern E in the outside. "The corresponding recording medium is" film back, CCD back A "10 or later: undefined.

The "power supply data" is 2-bit data and is as follows. 00: The meaning of the data is “no power battery in the image recording unit (power of the camera body is supplied)”. The corresponding recording medium is “film back, CCD back B” 01: The meaning of the data is “image recording The unit has a power battery. "The applicable recording medium is" CCD back A "10 or later: undefined.

The “ISO sensitivity data” is 000
5-bit data of 00 to 11111,
Allocated in 1/3 steps from 10000 to 10000. This is because, in the case of the film back 30, the ISO sensitivity read from the film cartridge is assigned.
In the case of D-back B, ISO100 equivalent is allocated.

As described above, when data unique to the mounted image recording unit is received by communication with the image recording unit and these are stored in the RAM 103B, next, in the received data from the image recording unit, It is determined from the power supply data whether a power supply battery is built in the recording medium (step S3). If the power supply battery is built in, a command communication is performed with the YCPU of the image recording unit to check the battery in the recording medium (step S3). S4). The result of the battery check is displayed on display means (display element or image monitor) provided in the image recording unit.

Next, the finder field frame LCD is set (step S5). That is, according to the image recording area data in the received data, the finder field frame is switched from the AF detection field data to the AF target mark in a manner according to (B) to (E) of FIG.

The photometric method is determined based on the photometric data in the data received from the image recording unit (step S6). In the case of the image sensor photometric method, the process proceeds to the next step S7. In this case, the process proceeds to step S10 described later.

Here, in the case of the film back 30,
Since the photometric sensor 10 is located only in the viewfinder, the F-type photometric method is used. Also, in the case of the CCD back A40, the photometry of the image pickup device is performed with priority given to enhancing the photometric accuracy. In this photometry of the image sensor, there is a problem that the current consumption is large in the release standby state. However, since the power supply battery 253 is built in the CCD back A40 and the secondary battery can be used, the current consumption is large. Does not burden the user. In addition, CCD back B5
In the case of 0, since the power supply battery is common to the power supply battery 100 of the camera body, the in-F metering method is used, giving priority to a small current consumption.

In the case of the image sensor photometry, first,
The first curtain is started by turning the first curtain control magnet 108 from ON to OFF using the shutter control circuit 110 (step S7). That is, in this case, in order to perform the image sensor photometry, it is necessary to fully open the focal plane shutter, and therefore, the front curtain is brought into the traveling completed state.

Then, photometry of the image sensor is performed (step S).
8). This image sensor photometry is performed as shown in FIG. That is, first, the integration time Tint of the CCD image sensor 255 is initialized to Tint0 (step S10).
0), integration is performed according to the integration time Tint of the CCD image sensor (step S101). And the image processing circuit 2
The image data is read out via the CPU 57 in the CCD back A 40 and the image data is evaluated (step S102). That is, according to the image recording area data in the data received from the image recording unit, DMAX, which is the maximum value of the image data, is obtained from the pixel data in a predetermined area in the image recording area.

The DMAX is evaluated (step S103). If DMAX> DFULL, that is, if the pixel data is arranged as shown in FIG. 11C, the integration time is too long. Therefore, the value obtained by multiplying the value of the current integration time Tint by １ ／ is calculated as a new integration time T
Replace as int (step S104). 11 (A) to 11 (C) show the distribution of pixel data at various integration levels. FIG. 11 (A) shows an appropriate integration level, and FIG. 11 (B) shows an integration time too short. When the integration level is not reached, (C) shows the case where the integration time is too long and the pixel data is saturated. In FIGS. 11A to 11C, the horizontal axis indicates the pixel arrangement direction. Actually, the pixel data is arranged in a two-dimensional direction, but is replaced by a one-dimensional array here for the sake of simplicity. DFULL is the maximum value level of the pixel data, and saturates when the luminance is higher than this. DSTD is a target value for feedback control of the integration time, which will be described later. DSTDL and DSTDH are allowable ranges of the integration level when the release is enabled.

On the other hand, in step S103, D
If MAX ≦ DFULL, replace Tint × (DSTD / DMAX) with a new integration time Tint in order to adjust the integration time to the target value (step S).
105).

After setting a new integration time Tint in step S104 or step S105 as described above, the value of DMAX is then changed to DSTDL ≦ DMA
It is determined whether or not X is within the range of DSTDH (step S106). If so, the image sensor photometry has been completed, so the process proceeds to the next step S107, and DSTDL ≦
If it is out of the range of DMAX ≦ DSTDH, the photometry of the image sensor has not been completed, and the process returns to step S101.

In this way, DSTD is performed in step S106.
If it is determined that L ≦ DMAX ≦ DSTDH,
It is determined that Tint = proper integration time (step S107). However, the mirror is in the down state, the amount of light is smaller than in the case of the normal exposure, and the proper integration time when the aperture is in the open state. That is, it is the integration time corresponding to the shutter speed SS at the open aperture value in the mirror down state.

When the photometry of the image sensor is completed as described above, the 1RSW 106 is monitored (step S10).
9) If it is ON, proceed to step S12, OFF
If so, the process returns to step S8.

On the other hand, when it is determined in step S6 that the photometry method is photometry in the viewfinder (photometry in F), first, the 1RSW 106 is monitored (step S10). Next step S
Proceed to step S11, and if it is OFF, repeat step S10. When the 1RSW 106 is turned on, the photometric sensor 10 is selected in accordance with the photometric pattern data in the data received from the image recording unit in a manner according to (B) or (C) of FIG. 7 to perform photometry ( Step S11).

After the end of the in-F metering, or after the ON of the 1RSW 106 is detected in step S9, data communication is performed with the LCPU 150 in the interchangeable lens 20, and the open aperture value, the position of the focusing lens,
Information and data on the interchangeable lens such as the focal length are received (step S12). Next, the Tint value obtained in step S8 or the photometric value obtained in step S11, ISO sensitivity data and recording medium data in data received from the image recording unit, the open aperture value from the interchangeable lens 20, and the focal length And the like, the shooting mode set by the shooting mode setting means (not shown) of the camera, and the like.
Aperture value (AV value) to be controlled according to Apex calculation
Then, the shutter speed SS to be controlled is determined (step S13). Then, distance measurement is performed using the AF sensor 66 (step S14). For the detailed principle of this distance measurement, refer to Japanese Patent Application No. 9-177497 filed by the present applicant.

Next, the driving amount of the photographing lens is obtained from the two-image interval data obtained in step S14 (step S15). Then, command communication is performed with respect to the interchangeable lens 20, and LD drive (lens drive for focusing) is performed (step S16). Thereafter, distance measurement for confirmation is performed (step S17), and this step S17 is performed.
It is determined whether the difference between the two-image interval data and the reference two-image interval data is larger than the threshold TH for focus determination (step S18). If it is larger than the threshold TH, it is determined that the image is out of focus and the above-described step S14 is performed.
Returning to step (A), when it is equal to or smaller than TH, it is determined that the object is in focus, and the process proceeds to the next step S19. Here, the reference two-image interval is the two-image interval obtained at the time of focusing, and varies depending on the flange back length of the recording medium. Therefore, it is determined according to the flange back length data which is the data received from the image recording unit. Also, a threshold T for focusing determination
H is determined from AF focusing threshold data.

If it is determined in step S18 that the subject is in focus, then the 2RSW 107 is monitored (step S1).
9) If it is ON, proceed to step S21; if it is OFF, proceed to step S20.

When 2RSW 107 is OFF, 1R
The SW 106 is monitored (step S20). If it is ON, the process returns to the step S19. If it is OFF, the process returns to the step S6.

In step S19, 2RSW1
When 07 is determined to be ON, the quick return mirror 2 is started to move up in order to switch the photographing light beam from the finder optical system to the imaging system (step S21). That is, the mirror S charge motor 112 is driven and controlled by the mirror S charge control circuit 113 to move up the mirror 2.

Next, command communication is performed with respect to the interchangeable lens 20, and the aperture mechanism 22 in the interchangeable lens starts to be stopped down in accordance with the AV value obtained in step S9 (step S22). When the focusing and the mirror-up are completed (steps S23 and S24), the exposure corresponding to the image recording unit is performed based on the recording medium data received from the image recording unit (step S25).

That is, when the image recording unit is the film back 30, the front curtain control magnet 108 is turned from ON to OFF using the shutter control circuit 110 according to the timing chart of FIG. The rear curtain control magnet 109 is turned on by the shutter control circuit 110
→ Turn OFF and perform exposure. The shutter time is determined by the difference between the running timings of the front curtain and the rear curtain, as shown in FIG.

The image recording unit is a CCD back B
In the case of 50, in accordance with the timing chart of FIG. 12B, in the shutter fully opened state (first curtain running completed, rear curtain not running), the electronic shutter of the CCD image sensor 304 is controlled to perform exposure. . In this case, as shown in the figure, the timing difference between the PD (photodiode) charge reset and the discharge of the PD charge to the transfer path is the shutter time S
Corresponds to S.

When the image recording unit is the CCD back A40, the shutter is fully opened before the exposure according to the timing chart of FIG. The exposure is executed by controlling the shutter. In this case, as shown in the figure, PD (photodiode) charge reset and PD
The timing difference at which the charges are discharged to the transfer path corresponds to the shutter speed SS.

When the exposure process is completed, the quick return mirror 2 is started to move down in order to switch the photographing light beam from the imaging system to the finder optical system (step S26). Then, command communication is performed with respect to the interchangeable lens 20, and the aperture opening operation of the aperture mechanism 22 in the interchangeable lens is started (step S27). Thus, A
When the V release operation and the mirror down are completed (steps S28 and S29), the mirror S charge control circuit 113
Drives the mirror S charge motor 112 to charge the shutter charging mechanism (step S30).

Thereafter, the type of the recording medium is determined according to the recording medium data received from the image recording unit (step S31).
After winding the film (step S32), the process returns to step S6. If the recording medium is an image sensor, command communication is performed with respect to the image recording unit,
The image processing circuit 257 or 306 performs image data processing such as image data compression and color conversion (step S
33), the image data is recorded on the image data recording medium 259 or 308 by the image recording circuit 258 or 307 (step S34), and the process returns to step S6.

Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments, and various modifications and applications are possible within the scope of the present invention. . Here, the summary of the present invention is as follows.

(1) In a camera system including a camera main body and an image recording unit detachable from the camera main body, the image recording unit includes storage means for storing data unique to the image recording unit, Transmitting means for transmitting the data to the camera main body, the camera main body comprising: photometric means for measuring subject brightness; receiving means for receiving the unique data from the transmitting means; A switching means for switching a light measuring range of the light measuring means based on the unique data received by the camera system.

Here, the image recording unit is a film
Back 30, CCD back A40, CCD back B50
Is equivalent to The storage means is the FC of the film back 30.
ROM 200A in PU 200, ROM 250A in CPU 250 of CCD back A40, CCD back B50
Of the CPU 300A. The transmitting means is the FCPU 200 of the film back 30, the CCD
CPU 250 of back A40, C of CCD back B50
It corresponds to the PU 300 and the electrical contact 116 of the image recording back mount between the camera body 1 and the image recording unit. Further, the camera body corresponds to the camera body 1. The photometric unit corresponds to the photometric sensor 10. The receiving means corresponds to the BCPU 103 of the camera body 1 and the electrical contacts 116 of the image recording back mount between the camera body 1 and the image recording unit. The switching means corresponds to the BCPU 103 of the camera body 1.

(2) In a camera system including a camera body and an image recording unit detachable from the camera body, the image recording unit includes a storage unit for storing data unique to the image recording unit, Transmitting means for transmitting the data to the camera body, the camera body receiving means for receiving the unique data from the transmitting means, and based on the unique data received by the receiving means. Selecting means for selecting one from a plurality of photometric means for measuring subject brightness by using the camera system.

Here, the image recording unit is a film
Back 30, CCD back A40, CCD back B50
Is equivalent to The storage means is the FC of the film back 30.
ROM 200A in PU 200, ROM 250A in CPU 250 of CCD back A40, CCD back B50
Of the CPU 300A. The transmitting means is the FCPU 200 of the film back 30, the CCD
CPU 250 of back A40, C of CCD back B50
It corresponds to the PU 300 and the electrical contact 116 of the image recording back mount between the camera body 1 and the image recording unit. Further, the camera body corresponds to the camera body 1. The plurality of photometric units correspond to the photometric sensor 10 and the CCD image sensor 255 (see FIG. 10) of the CCD back A40. The receiving means is the BCPU 103 of the camera body 1,
And an electrical contact 116 of an image recording back mount between the camera body 1 and the image recording unit. The selection means corresponds to the BCPU 103 of the camera body 1.

(3) In a camera system including a camera main body and an image recording unit detachable from the camera main body, the image recording unit includes storage means for storing data unique to the image recording unit, Transmitting means for transmitting the data to the camera main body, the camera main body comprising: photometric means for measuring subject brightness; receiving means for receiving the unique data from the transmitting means; Based on the unique data received at the discriminating means for discriminating the image recording unit, by the discriminating means, when it is determined that the image recording unit is a film back that can be exposed to film,
Light measuring means of the camera body, and when it is determined that the image recording unit is a CCD back having an image pickup means, a light measurement selecting means for performing light measurement by using the image pickup means as the light measurement means. Camera system characterized by the above-mentioned.

Here, the image recording unit is a film
Back 30, CCD back A40, CCD back B50
Is equivalent to The storage means is the FC of the film back 30.
ROM 200A in PU 200, ROM 250A in CPU 250 of CCD back A40, CCD back B50
Of the CPU 300A. The transmitting means is the FCPU 200 of the film back 30, the CCD
CPU 250 of back A40, C of CCD back B50
It corresponds to the PU 300 and the electrical contact 116 of the image recording back mount between the camera body 1 and the image recording unit. Further, the camera body corresponds to the camera body 1. The photometric unit corresponds to the photometric sensor 10. The receiving means corresponds to the BCPU 103 of the camera body 1 and the electrical contacts 116 of the image recording back mount between the camera body 1 and the image recording unit. The determination means corresponds to the BCPU 103 of the camera body 1. The photometric selection means is
It corresponds to the BCPU 103 of the camera body 1. The film back corresponds to the film back 30. The CCD back is equivalent to the CCD back A40, and the imaging means is the CC back A40.
This corresponds to the CCD image sensor 255 of the D-back A40.

(4) In a camera system including a camera body and an image recording unit detachable from the camera body, the image recording unit corresponds to a film holding mechanism or an image sensor and a type of a recording medium. Memory means for recording the unique data, and communication means for transmitting the unique data to the camera body, wherein the camera body has a photographic lens or a holding mechanism for the photographic lens, a holding mechanism for the image recording unit, Communication means for communicating with the image recording unit; photometric means for switching the photometric range for measuring subject brightness; and switching means for switching the photometric range of the photometric means in accordance with the unique data from the image recording unit. And a camera system comprising:

Here, the image recording unit is a film
Back 30, CCD back A40, CCD back B50
Is equivalent to The film holding mechanism is film back 3
0 corresponds to the holding mechanism of the IX250 film 31 at 0, and the imaging device is the CCD imaging device 2 of the CCD back A40.
55 corresponds to the CCD image sensor 304 of the CCD back B50. The memory means is the FCP of the film back 30.
ROM 200A in U200, C of CCD back A40
It corresponds to the ROM 250A in the PU 250 and the ROM 300A in the CPU 300 of the CCD back B50. The communication means of the image recording unit is the FCP of the film back 30.
U200, CPU 250 of CCD back A40, CCD
It corresponds to the CPU 300 of the back B50 and the electrical contacts 116 of the image recording back mount between the camera body 1 and the image recording unit. Further, the camera body corresponds to the camera body 1. The taking lens or the holding mechanism of the taking lens corresponds to the interchangeable lens 20 or the body side lens mount 12. The holding mechanism of the image recording unit corresponds to the body-side image recording back mount 13. The communication means of the camera body includes the BCPU 103 of the camera body 1 and the image recording back-up between the camera body 1 and the image recording unit.
It corresponds to the electrical contact 116 of the mounting section. The photometric means is
It corresponds to the photometric sensor 10. The switching means corresponds to the BCPU 103 of the camera body 1.

(5) In a camera system including a camera body and an image recording unit detachable from the camera body, at least two or more types of photometric means are provided in the camera body or the image recording unit. Wherein the image recording unit comprises: a film holding mechanism or an image sensor; a memory unit for recording unique data corresponding to a type of a recording medium; and a communication unit for transmitting the unique data to a camera body. The main body includes a photographing lens or a photographing lens holding mechanism, a holding mechanism of the image recording unit, a communication unit for communicating with the image recording unit, and unique data from the image recording unit.
And a selecting means for selectively using the photometric means.

Here, the image recording unit is a film
Back 30, CCD back A40, CCD back B50
And the camera body corresponds to the camera body 1.
At least two or more types of photometric means correspond to the photometric sensor 10 in the camera body 1 and the CCD image sensor 255 of the CCD back A 40 (see FIG. 10). The film holding mechanism of the image recording unit corresponds to the holding mechanism of the IX250 film 31 in the film back 30.
Is equivalent to The memory means is the F of the film back 30.
ROM 200A in CPU 200, CCD back A40
ROM 250A in the CPU 250, CCD back B5
0 corresponds to the ROM 300A in the CPU 300. The communication means of the image recording unit is the F
CPU 200, CPU 250 of CCD back A40, C
CPU 300 of CD back B50 and camera body 1
It corresponds to the electrical contact 116 of the image recording back mount between the and the image recording unit. The taking lens or the holding mechanism of the taking lens in the camera body is an interchangeable lens 2.
0 or equivalent to the lens mount 12 on the body side. The holding mechanism of the image recording unit corresponds to the body-side image recording back mount 13. The communication means of the camera body corresponds to the BCPU 103 of the camera body 1 and the electrical contacts 116 of the image recording back mount between the camera body 1 and the image recording unit. The selection means corresponds to the BCPU 103 of the camera body 1.

(6) In a camera system including a camera main body and an image recording unit detachable from the camera main body, the image recording unit includes storage means for storing data unique to the image recording unit, Transmitting means for transmitting the data to the camera main body, the camera main body comprising: photometric means for measuring subject brightness; receiving means for receiving the unique data from the transmitting means; Switching means for switching the photometric range of the photometric means based on the specific data received in the step (a). A camera system, wherein a photometric range of the photometric unit is switched based on a range of the included image capturing unit.

Here, the image recording unit is a film
Back 30, CCD back A40, CCD back B50
Is equivalent to The storage means is the FC of the film back 30.
ROM 200A in PU 200, ROM 250A in CPU 250 of CCD back A40, CCD back B50
Of the CPU 300A. The transmitting means is the FCPU 200 of the film back 30, the CCD
CPU 250 of back A40, C of CCD back B50
It corresponds to the PU 300 and the electrical contact 116 of the image recording back mount between the camera body 1 and the image recording unit. Further, the camera body corresponds to the camera body 1. The photometric unit corresponds to the photometric sensor 10. The receiving means corresponds to the BCPU 103 of the camera body 1 and the electrical contacts 116 of the image recording back mount between the camera body 1 and the image recording unit. The switching means corresponds to the BCPU 103 of the camera body 1. The CCD back corresponds to the CCD back B50, and the imaging means is a CCD back.
This corresponds to the CCD image sensor 304 of the back B50.

(7) In a camera having a detachable image recording unit, photometric means for measuring subject brightness, and receiving means for receiving data unique to the image recording unit transmitted from the image recording unit, A switching means for switching a light measuring range of the light measuring means based on the unique data received by the receiving means.

Here, the image recording unit is a film
Back 30, CCD back A40, CCD back B50
Is equivalent to The camera body corresponds to the camera body 1. The photometric unit corresponds to the photometric sensor 10. The receiving means corresponds to the BCPU 103 of the camera body 1 and the electrical contacts 116 of the image recording back mount between the camera body 1 and the image recording unit. The switching means corresponds to the BCPU 103 of the camera body 1.

(8) In a camera having a detachable image recording unit, a receiving means for receiving data unique to the image recording unit transmitted from the image recording unit, and the unique data received by the receiving means. Selecting means for selecting one of a plurality of photometric means for measuring subject brightness based on the data.

Here, the image recording unit is a film
Back 30, CCD back A40, CCD back B50
Is equivalent to The camera body corresponds to the camera body 1. The plurality of photometric units correspond to the photometric sensor 10 and the CCD image sensor 255 (see FIG. 10) of the CCD back A40. The receiving means is the BCPU 103 of the camera body 1,
And an electrical contact 116 of an image recording back mount between the camera body 1 and the image recording unit. The selection means corresponds to the BCPU 103 of the camera body 1.

(9) In a camera having a detachable image recording unit, photometric means for measuring subject brightness, and receiving means for receiving data unique to the image recording unit transmitted from the image recording unit, Based on the unique data received by the receiving means, determining means for determining the image recording unit, by the determining means,
When it is determined that the image recording unit is a film back capable of exposing a film, photometry is performed by the photometry unit of the camera body, and when it is determined that the image recording unit is a CCD back having an imaging unit, A photometric selecting means for performing photometry using the imaging means as photometric means.

Here, the image recording unit is a film
Back 30, CCD back A40, CCD back B50
Is equivalent to The camera body corresponds to the camera body 1. The photometric unit corresponds to the photometric sensor 10. The receiving means corresponds to the BCPU 103 of the camera body 1 and the electrical contacts 116 of the image recording back mount between the camera body 1 and the image recording unit. The determination means corresponds to the BCPU 103 of the camera body 1. The photometric selection means is
It corresponds to the BCPU 103 of the camera body 1. The film back corresponds to the film back 30. The CCD back is equivalent to the CCD back A40, and the imaging means is the CC back A40.
This corresponds to the CCD image sensor 255 of the D-back A40.

[0106]

As described in detail above, according to the present invention,
To provide a camera system capable of performing photometry by switching the photometry range according to the type of the image recording unit and performing photometry in a photometry range commensurate with the size of the image recording area of the image recording unit. Can be. Further, according to the present invention, it is possible to provide a camera system capable of performing photometry by selecting an optimal photometry method according to the type of the image recording unit.

[Brief description of the drawings]

FIG. 1 is a simplified sectional view showing a camera system according to an embodiment of the present invention.

FIG. 2 is a diagram showing an electrical configuration of the camera system of FIG. 1 with a film back attached.

FIG. 3 is a diagram showing an electrical configuration of a CCD back A.

FIG. 4 is a diagram showing an electrical configuration of a CCD back B;

5A is a diagram showing a state in which all segments of the LCD in the viewfinder are displayed, and FIG. 5B is a diagram showing a state in which an H size (high-definition print size) or a CCD back A is mounted on an IX240 film with a film back mounted. The figure which shows the display mode of the corresponding visual field frame, (C)
The figure which shows the display mode of the visual field frame corresponding to the P size (panorama print size) in the IX240 film at the time of mounting a back, (D) is IX at the time of mounting a film back
It is a figure which shows the display mode of the visual field frame corresponding to C size (classic print size) in 240 film, and (E) is a figure which shows the display mode of the visual field frame corresponding at the time of mounting the CCD back B.

FIG. 6 is a block diagram schematically showing a part related to focus detection.

7A is a diagram showing a sensor pattern of a photometric sensor, FIG. 7B is a diagram showing a photometric pattern to be selected when a film back or a CCD back A is mounted, and FIG. FIG. 9 is a diagram illustrating a photometric pattern to be selected when a back B is mounted.

FIG. 8 is a diagram showing an internal equivalent circuit of a photometric sensor and a photometric processing circuit.

FIG. 9 is an operation flowchart of a BCPU in a camera body for explaining an operation of the camera system in one embodiment.

FIG. 10 is a flowchart of an image sensor photometry process in FIG. 9;

11A is a diagram showing a distribution of pixel data when the integration level is appropriate, and FIG. 11B is a diagram showing a distribution of pixel data when the integration level is not reached because the integration time is too short. ,
(C) is a diagram showing a distribution of pixel data when the integration time is too long and the pixel data is saturated.

FIG. 12A is a timing chart for explaining exposure control when a film back is mounted,
(B) is a timing chart for explaining exposure control when the CCD back B is mounted, and (C) is a timing chart for explaining exposure control.
6 is a timing chart for explaining exposure control when a CD back A is mounted.

[Explanation of symbols]

 Reference Signs List 1 camera body 4 AF detection module 10 photometric sensor 11 viewfinder frame LCD 12 body side lens mount 13 body side image recording back mount 20 interchangeable lens 21, 23 shooting lens 22 aperture mechanism 24 interchangeable lens side lens mount 30 image recording Unit (film back) 31 IX240 film 32 Film back side image recording back mount 40 Image recording unit (CCD back A) 41, 51 CCD 50 Image recording unit (CCD pack B) 66 AF sensor 103 BCPU 103A, 200A, 250A, 300A ROM 103B RAM 116 Electrical contacts 200 FCPU 250, 300 CPU 255, 304 CCD image sensor 259, 308 Image data recording medium

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/235 H04N 5/235 F-term (Reference) 2H002 AB00 BC03 DB02 DB04 DB06 DB14 DB15 DB19 DB21 FB01 FB30 FB31 FB40 FB58 GA00 GA71 HA00 HA11 HA19 JA01 JA07 2H054 AA01 AA03 BB00 CD03 2H101 FF00 2H104 AA18 CC07 5C022 AA13 AB02 AB12 AB17 AC02 AC03 AC12 AC14 AC31 AC32 AC42 AC52 AC54 AC56 AC69 AC74 AC77 AC80

Claims (3)

[Claims] In a camera system including a camera body and an image recording unit detachable from the camera body, the image recording unit comprises: a storage unit for storing data unique to the image recording unit; Transmitting means for transmitting data to the camera main body, wherein the camera main body comprises: photometric means for measuring subject brightness; receiving means for receiving the unique data from the transmitting means; and Switching means for switching a light measuring range of the light measuring means based on the received unique data. 2. In a camera system including a camera body and an image recording unit detachable from the camera body, the image recording unit comprises: a storage unit for storing data unique to the image recording unit; Transmitting means for transmitting data to the camera body, the camera body receiving means for receiving the unique data from the transmitting means, and based on the unique data received by the receiving means. And a selecting means for selecting one of a plurality of photometric means for measuring subject brightness. 3. In a camera system including a camera body and an image recording unit detachable from the camera body, the image recording unit comprises: storage means for storing data unique to the image recording unit; Transmitting means for transmitting data to the camera main body, wherein the camera main body comprises: photometric means for measuring subject brightness; receiving means for receiving the unique data from the transmitting means; and Based on the unique data received,
Discriminating means for discriminating the image recording unit; and when the discriminating means determines that the image recording unit is a film back capable of exposing a film, the photometering means of the camera body measures the light, A camera system comprising: a photometric selection unit that performs photometry by using the imaging unit as a photometry unit when is determined to be a CCD back having an imaging unit.