JP2003287782A - Camera body and camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily set a photographing condition when attaching a back cover to which a solid-state image pickup element is mounted. <P>SOLUTION: The camera CPU 116 of a camera body is provided with an element information fetching part 151 to fetch element information including the size of the CCD of an electronic image pickup part and a pixel size, a lens information fetching part 152 to fetch lens information including focal distance information, a focusing condition setting part 153 to set a focusing width which is a reference to judge whether or not focusing is performed based on the element information and an exposure condition setting part 154 to set shutter speed and a stop value by using a program chart based on the element information and the lens information. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a structure in which a second back cover for mounting a solid-state image pickup device can be mounted instead of the first back cover for shielding the silver salt film from light. The present invention relates to a camera body and a camera that form a camera by mounting a second case back.

[0002]

2. Description of the Related Art A camera body is provided with a back cover (referred to as a first back cover) that shields a silver salt film from light and a back cover (referred to as a second back cover) on which a solid-state imaging device such as a CCD is mounted. By doing so, a silver-salt film and a digital dual-purpose camera capable of selectively shooting a silver-salt film and a digital image are known.

When the second back cover is mounted and used as a digital camera, the C mounted on the second back cover is used.
The usable range of the aperture amount is restricted by the size of the CD and the pixel size. Therefore, in the conventional dual-purpose camera, the photographing conditions such as the exposure condition are changed according to the size and pixel size of the CCD mounted on the second case back.

[0004]

On the other hand, as the CCD mounted on the second case back, various CCDs having different sizes and pixel sizes are adopted. Therefore, in the conventional dual-purpose camera described above, according to the size and pixel size of the CCD mounted on the mounted second case back,
It was necessary to set the shooting conditions, and the setting of these shooting conditions was complicated.

The present invention has been made in view of the above problems, and when a back lid for mounting a solid-state image pickup device is attached,
An object of the present invention is to provide a camera body and a camera that can easily set shooting conditions.

[0006]

According to a first aspect of the present invention, there is provided a camera main body in which a first back cover which shields a silver salt film from light is used.
A camera body that has a structure to which a second back cover on which a solid-state imaging device is mounted can be mounted, and that constitutes a camera by mounting one of the first and second back covers.
Element information capturing means for capturing element information including at least one of the size of the solid-state image sensor and the pixel size when the back cover of the solid-state image sensor is mounted, and a focus determination condition that sets a focus determination condition based on the element information. At least one of condition setting means and exposure condition setting means for setting an exposure condition based on the element information is provided.

According to the above invention, when the second case back is attached, the device information capturing means captures the device information including at least one of the size of the solid-state image sensor and the pixel size, and focuses. The condition setting means sets the focus determination condition based on the element information, and the exposure condition setting means sets the exposure condition based on the element information. Therefore, since the focusing determination condition is set based on the element information, the appropriate focusing determination condition is easily set. Further, since the exposure condition is set based on the element information, the proper exposure condition is easily set.

According to a second aspect of the present invention, there is provided a camera body according to the first aspect.
The camera body according to item 1, further comprising lens information capturing means for capturing lens information including focal length information of the photographing lens, wherein the exposure condition setting means sets the exposure condition based on the focal length information. I am trying.

According to the above invention, the lens information fetching means fetches the lens information including the focal length information of the photographing lens, and the exposure condition setting means sets the exposure condition based on the focal length information. Further appropriate exposure conditions are set.

According to a third aspect of the present invention, there is provided a camera body according to the first aspect.
Alternatively, in the camera body described in Item 2, the focusing condition setting unit sets a focusing determination width for determining whether or not the subject is in focus.

According to the above invention, the focusing condition setting means sets the focusing determination width for determining whether or not the focusing is performed based on the element information. Therefore, the defocus amount and the focusing amount are set. An appropriate focus determination can be easily performed by comparing the determination width.

A camera body according to a fourth aspect is the camera body according to the first aspect.
The camera body according to any one of 1 to 3 is characterized in that the exposure condition setting means sets the exposure condition by using a program diagram.

According to the above invention, since the exposure condition is set by the exposure condition setting means by using the program diagram, the proper exposure condition can be set easily and easily.

The camera according to claim 5 is the camera according to any one of claims 1 to 4.
One of the first and second back covers is attached to the camera body according to any one of 1 to 3 above.

According to the above invention, one of the first and second case backs is mounted on the camera body according to any one of claims 1 to 4, so that the second case back is provided. It becomes possible to realize a camera in which, when mounted, appropriate focusing conditions and exposure conditions are set.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an example of a block diagram showing a configuration of a main part of a camera body according to the present invention. A silver salt film camera is configured by mounting a first back cover, which will be described later, on the camera body. Also, by mounting a second case back described later on this camera body,
A digital camera is constructed.

The camera body 1 includes a battery 101 for supplying electric power to each unit, a DC / DC converter 102 for converting the voltage supplied from the battery 101 into a predetermined voltage, and a display for displaying various information such as photographing conditions. Unit 103, photometric unit 104 for measuring the brightness of the subject, dimming unit 105 for photometrically measuring the flash light reflected by the subject, lens unit 106 for focusing the light flux from the subject on the image plane, and power A power supply terminal 107 used for outputting, an adjustment terminal 108 used for transmitting information, an EEPROM 109 for storing various adjustment values, an internal flash 110 for illuminating a subject, and a DX code for detecting The DX terminal 111 used, the distance measuring unit 112 that measures the defocus amount, and the AF motor driving unit 113 that performs AF driving.
A shutter unit 114 that controls the shutter speed, a diaphragm unit 115 that controls the diaphragm, a camera CPU 116 that controls the operation of each unit, and a switch unit 117 that receives an operation from the outside.

An external flash 4 can be attached to the camera body 1. External flash 4
Is a light emitting unit that emits a larger amount of light than the built-in flash 110 and can change the irradiation direction of the flash light.

The battery 101 is a DC / DC converter 10
The electric power is supplied to each unit via the unit 2. DC / D
The C converter 102 converts a voltage supplied from the battery 101 into a predetermined voltage and supplies electric power of the predetermined voltage to each unit of the camera body 1.

The display unit 103 is composed of an LCD or the like, and displays various information such as photographing conditions based on a command from the camera CPU 116. The photometric unit 104 measures the brightness of the subject necessary for proper exposure with a photoelectric conversion element or the like, and outputs the measurement result to the camera CPU 116. The light control unit 105 measures the flash light reflected by the subject to control the light emission amount of the built-in flash 110 or the external flash 4, and outputs the measurement result to the camera CPU 116.

The lens unit 106 is an interchangeable lens, for example, an electric zoom lens, and has a memory for storing lens information including focal length information, and this information is stored in the camera CPU 116. It is what is output. The lens may be integrally attached to the frame of the camera body 1. In addition, the lens unit 106
Is, for example, 1 of the AF motor of the AF motor drive unit 113.
It is provided with a memory such as a ROM in which information indicating the amount of movement of the lens in the optical axis direction per rotation is stored in advance.

The power supply terminal 107 is a terminal for outputting the electric power of the battery 101 to a first back cover or a second back cover which will be described later. The adjustment terminal 108 is a terminal for transmitting information between various adjustment devices, accessories, and the like, and here is a terminal for transmitting information between a second case back and a camera CPU 116, which will be described later. used.

The EEPROM 109 is a camera CPU 11
6 is a rewritable nonvolatile memory that stores various adjustment values, correction values, and the like. The built-in flash 110 is a light emitting unit built in the camera body 1 for illuminating a subject, which is composed of a charging / light emission control circuit and a light emitting unit. The DX terminal 111 is a terminal used for detecting a DX code, and is used here as a terminal for transmitting information between the second back cover and the camera CPU 116.

The distance measuring unit 112 measures the distance between the camera body 1 and the subject by, for example, the phase difference detection method and outputs the measurement result to the camera CPU 116. The AF motor drive unit 113 includes a DC motor as a drive source, a motor such as a stepping motor, and a deceleration system for decelerating the rotation speed of the motor. The AF motor drive unit 113 performs AF drive of the lens unit 106 based on a command from the camera CPU 116. Is. The shutter unit 114 includes a mechanical shutter and a drive unit for the mechanical shutter, and controls the shutter speed based on a command from the camera CPU 116.

The diaphragm unit 115 includes a diaphragm mechanism and a drive unit thereof, and controls the diaphragm based on a command from the camera CPU 116.

The camera CPU 116 controls operations such as photometry, distance measurement, and exposure of the camera body 1, and the EE
Control is performed by executing a program based on various adjustment values stored in the PROM 109.
In the present embodiment, the camera CPU 116 is
A CPU (central processing unit), a ROM and a RAM,
The control is performed by the CPU executing the program stored in the ROM. Also, camera C
As will be described later, the PU 116 takes in element information of the solid-state image sensor from the second case back and controls operations such as focusing and exposure based on this element information (see FIG. 7).

The switch unit 117 receives an operation from the outside and outputs various commands to the camera CPU 116. Here, the switch unit 117 includes the switch S.
1, switch S2, switch SMAIN, switch SR
C, switch SUD and switch SISO.

The switch S1 outputs a command for starting the photometry operation to the photometry unit 104 and a command for starting the distance measurement operation to the distance measurement unit 112 via the camera CPU 116. It is a switch for preparation.

The switch S2 is a release switch for outputting to the camera CPU 116 a command to start exposure for photographing. Upon receiving this command, the camera CPU 116 determines the focus position and the proper exposure condition, and outputs a drive command to the shutter unit 114 and the diaphragm unit 115.

The switch SMAIN is used for the camera CPU 11
A switch for setting the supply or stop of power from the DC / DC converter 102 to each unit of the camera body 1 via 6. Whether or not the switch SRC has a first or second back cover described later attached (whether or not the back cover is attached)
Is a switch for detecting. The switch SUD is
This is a switch for changing (increasing or decreasing) various set values such as the shutter speed, aperture, and sensitivity (ISO) of the camera body 1. The switch SISO is a switch for setting whether or not to change the sensitivity setting value of the camera body 1.

FIG. 2 is an example of a block diagram showing a configuration of a main part of a back cover (referred to as a second back cover) on which an electronic image pickup section mounted on the camera body is mounted. The second case back 2 includes an electronic image pickup unit 201 that forms digital image data from a light flux from a subject, and an SDRAM 2 that stores image data and the like.
02 and a memory card unit 203 for storing image data and the like
And a monitor 204 for displaying image data, D-CP
A flash memory 205 that stores a program that causes the U209 to function, and a DC / DC converter 206 that converts a voltage supplied via a power supply terminal 208 into a predetermined voltage.
And a communication terminal 207 used for transmitting information, a power supply terminal 208 used for transmitting power, a D-CPU 209 for controlling each part of the second case back 2, and an operation from the outside. And a switch unit 210. The second case back 2 is attached to the camera body 1 when a digital image is taken.

The electronic image pickup section 201 is provided with a solid-state image pickup element (here, CCD), and photoelectrically converts a light flux from a subject which passes through the lens section 106 and is incident in a state of being attached to the camera body 1. To form digital image data, and form the formed image data in the D-CPU 209.
Is output to.

The SDRAM 202 is a known SDRAM.
(Synchronous Dynamic RAM)
The image data and the like formed by the electronic image pickup unit 201 are stored. The memory card unit 203 has a second
It can be attached to and detached from the back cover 2, and is composed of a memory card such as a compact flash and smart media, and has a capacity for storing a plurality of frames of image data formed by the electronic image pickup unit 201. .

The monitor 204 is composed of an LCD or the like, and has an SD
The image data and the like stored in the RAM 202 or the memory card unit 203 are displayed. The flash memory 205 is a program that causes the D-CPU 209 to function,
It is a rewritable memory that stores element information including the CCD size and pixel size.

The DC / DC converter 206 converts the voltage supplied from the battery 101 of the camera body through the power supply terminal 208 into a predetermined voltage, and supplies the power of the predetermined voltage to each part of the second back cover 2. To supply.

The communication terminal 207 is a DX of the camera body 1.
It is a terminal that is connected to the terminal 111 and the adjustment terminal 108 and is used for transmitting information between the camera body 1 and the D-CPU 209. This communication terminal 207 is the DX terminal 11
Communication terminal 207a connected to 1 and adjustment terminal 108
And a communication terminal 207b connected to (see FIG. 4 and FIG. 5).

The power supply terminal 208 is a terminal which is connected to the power supply terminal 107 of the camera body 1 and used for transmitting electric power between the DC / DC converter 206 and the battery 101 of the camera body 1.

The D-CPU 209 is the flash memory 2
According to the program stored in 05, the communication terminal 20
Various information such as element information to be described later is output to the camera body 1 via 7 and the photographing control information and the like is received from the camera body 1 (or in response to the operation of the switch unit 210) to obtain the second information. The control of each part of the back cover 2 is performed.
That is, the image data forming operation in the electronic image pickup unit 201, the image data transfer operation from the electronic image pickup unit 201 to the SDRAM 202 and the memory card unit 203, the SDRAM
It controls the transfer operation of image data from the 202 and the memory card unit 203 to the monitor 204, the display operation of the image data on the monitor 204, and the like.

The switch section 210 receives an external operation and outputs various commands to the D-CPU 209. Here, the switch unit 210 uses the switch SD.
It includes a MAIN, a switch SPLAY, a switch SDUD, a switch SREC and a switch SMODE.

The switch SDMAIN is the D-CPU 20.
It is a switch for controlling the supply or stop of electric power from the DC / DC converter 206 to each part of the second case back 2 via 9.

The switch SDUD is connected to the SDRAM 202 or the memory card unit 203 via the D-CPU 209.
Is a switch for changing (increasing or decreasing) various setting values such as the frame number of the image data stored in.

The switch SPLAY is for the D-CPU 209.
Via the SDRAM 202 or the memory card unit 20
3 is a switch for setting whether to display the image data stored in No. 3 on the monitor 204.

The switch SREC is a switch for setting whether or not image data can be transferred from the electronic image pickup unit 201 to the SDRAM 202 or the memory card unit 203 via the D-CPU 209. That is, when shooting is performed, the switch SREC is set to transfer the image data (this state is referred to as REC mode).

The switch SMODE is a D-CPU 209.
Via the SDRAM 202 or the memory card unit 20
A switch for changing (increasing or decreasing) various set values such as the frame number of the image data stored in 3.
Used to select the setting item to be changed. That is, the switch SMODE selects the setting item to be changed, and the switch SDUD increases or decreases the setting value of the setting item.

FIG. 3 shows an example of the configuration of a back cover (referred to as a first back cover) 3 which is attached so as to cover the back surface of the camera body 1 at the time of photographing a silver halide film, and (a) is a front view. , (B) are top views. On the left side of the first case back 3,
A film confirmation window 301 is provided for visually recognizing whether or not a film cartridge is loaded, and a display for displaying various information relating to photographing, which is made of an LCD or the like, is provided at a substantially central portion of the first case back 3. A section 302 is provided.

A film is movably pressed between the first back cover 3 and the camera body 1 in the left-right direction in the drawing so that the film surface is positioned at the image forming position. A film pressing plate 303 is provided, and on the right side of the first back cover 3, a communication terminal 304 for transmitting information between the camera CPU 116 of the camera body 1 and the first back cover 3.
Is provided. A protrusion 305 for operating the switch SRC of the camera body 1 when mounted on the camera body 1 is provided on the left end portion of the first case back 3. The protrusion 305 also has a semi-locking function for closing the first back cover 3 when the first back cover 3 is attached to the camera body 1.

The pin-shaped projections 306 are for mounting on the camera body 1 and are formed at the upper and lower right end portions.
It is adapted to engage with insertion holes (not shown) formed at corresponding positions above and below. As a result, the first back cover 3 can be opened and closed with the center of the pin-shaped projection 306 as the rotation axis.

FIG. 4 shows an example of the configuration of a back cover (referred to as a second back cover) 2 which is attached so as to cover the back surface of the camera body 1 at the time of photographing a digital image. (A) is a front view, (B) is a top view. A monitor 204 is provided substantially in the center of the second case back 2, and a switch unit 210 is provided on the right side of the monitor 204 (see FIG. 2).

An electronic image pickup unit 201 is provided at a substantially central portion of the second back cover 2, and a communication terminal 207b is provided on the right side of the second back cover 2 at a position facing the adjustment terminal 108. ing. On the left side of the second back cover 2, there is formed a convex portion 20 having substantially the same shape as that of the film cartridge, and the power source terminals 208 are respectively provided at appropriate positions on the surface thereof and facing the power source terminals 107 and the DX terminals 111. And communication terminal 20
7a is provided. Further, a protrusion 211 for operating the switch SRC of the camera body 1 when mounted on the camera body 1 is provided on the left end portion of the second case back 2. The protrusion 211 also has a semi-locking function for closing when the second case back 2 is attached to the camera body 1.

The pin-shaped projections 212 are for mounting on the camera body 1 and are formed on the upper and lower right end portions.
It is adapted to engage with insertion holes (not shown) formed at corresponding positions above and below. As a result, the second case back 2 can be opened and closed with the center of the pin-shaped projection 212 as the axis of rotation.

FIGS. 5A and 5B show an example of the configuration of the camera body 1 with the second case back 2 attached, where FIG. 5A is a rear view and FIG. 5B is a top sectional view. . Camera body 1
A slide type switch SMAIN is provided on the upper left side of the.

A shutter portion 114 is provided at a substantially central portion on the back side of the camera body 1, and the electronic image pickup portion 201 is opposed thereto. An adjustment terminal 108 is provided on the right side of the camera body 1, and a communication terminal 207b faces this.
Further, on the left side of the camera body 1, a DX terminal 111 and a power supply terminal 107 are provided so as to face the film cartridge chamber, and a communication terminal 207a and a power supply terminal 208 are respectively provided.
Is facing. Furthermore, at the left end of the camera body 1,
A switch SRC is provided, and this switch SRC is
Is pressed by the projection 305 of the first back cover 3 or the projection 211 of the second back cover 2 to operate, the movable piece SRC1 is displaced, this switch state is transmitted to the camera CPU 116, and the camera CPU 116 backs up. Detection is made as to whether the lid is closed. The switch SRC is not limited to the mechanical switch as described above, but may be a proximity switch.

FIG. 6 shows the camera CPU 11 of the camera body 1.
6 is an example of a functional configuration diagram of a main part in FIG. Camera C
The PU 116 is an element information acquisition unit 15 that acquires element information.
1 (corresponding to element information capturing means), a lens information capturing section 152 for capturing lens information (corresponding to lens information inputting means), and a focusing condition setting section 15 for setting focusing conditions.
3 (corresponding to focusing condition setting means) and an exposure condition setting unit 154 (corresponding to exposure condition setting means) for setting exposure conditions.

The element information acquisition unit 151 has a DX terminal 111.
And D- of the second case back 2 via the communication terminal 207a.
Element information including the CCD size and pixel size (one pixel size) of the electronic imaging unit 201 is fetched from the CPU 209. The lens information capturing unit 152 captures lens information including focal length information from the lens unit 106.

The focusing condition setting unit 153 sets a focusing width, which is a reference for whether or not focusing is performed, based on the element information acquired by the element information fetching unit 151. When the absolute value of the defocus amount is less than or equal to the focus width, it is determined that the focus is achieved.

Here, the method of setting the focus width performed by the focus condition setting unit 153 will be specifically described.
Digital images taken by the CCD are often displayed on a monitor such as a personal computer for viewing. In such a case, the image is enlarged and displayed so as to match the screen size of the monitor (or to a size desired by the user). In the case of enlarging an image, a CCD with a size smaller than one frame of a silver halide film will appear to be out of focus in an image with poor focus, so the accuracy required for focusing the original image is severe. . Therefore, as compared with the case of shooting on a silver salt film (when shooting with the first back cover 3 attached), when shooting on the CCD (when wearing the second back cover 2) Needs to determine the focus more strictly (decrease the focus width). Therefore,
The focusing condition setting unit 153 sets a focusing width having a smaller value when the second back cover 2 is attached than when the first back cover 3 is attached. Is.

There are various CCD sizes. The smaller the size (or the smaller the pixel size of the CCD), the larger the enlargement ratio when enlarging the image on the monitor. The required accuracy for focusing is strict. Therefore, the smaller the CCD size (or C
The smaller the pixel size of the CD, the more severe the focus needs to be determined (the narrower the focus width). Therefore, the focusing condition setting unit 153 sets a smaller focusing width as the CCD size is smaller.

The exposure condition setting unit 154 uses the program information to be described later based on the element information acquired by the element information acquisition unit 151 and the lens information acquired by the lens information acquisition unit 152. The shutter speed and the aperture value are set.

Here, the method of setting the aperture value performed by the exposure condition setting unit 154 will be specifically described.
Compared with the case of shooting with a silver salt film (when shooting with the first back cover 3 attached), the case of shooting with a CCD (when wearing the second back cover 2) Since the CCD size is smaller than the size of one frame of silver salt film,
The range of usable aperture values is narrow. Therefore, it is necessary to set the aperture value within the range of the aperture value determined by the size of the CCD. Further, the image picked up by the CCD has a remarkable decrease in the peripheral light amount as compared with the image picked up by the silver salt film. Therefore, when photographing with a CCD (second back cover 2
In the case of taking a picture with the lens attached), the image quality is improved by setting the aperture value to the aperture side in order to relatively increase the aperture efficiency. Therefore, the exposure condition setting unit 154 uses the CCD
When shooting with the second back cover 2 (when shooting with the second case back 2), the aperture value is set within the range of the aperture value determined by the size of the CCD, and the aperture value is set relatively toward the aperture side. Set.

Further, when the focal length of the lens becomes long, the image circle, which is a range in which the illuminance (peripheral light amount) necessary for the purpose of photography and the image quality are maintained, is relatively enlarged, so that photography with priority on shutter speed is possible. The image quality is improved by setting the aperture value to the open side. Therefore, the exposure condition setting unit 154 sets the aperture value to the open side as the focal length of the lens becomes longer.

The operation of the camera body 1 when the second case back 2 is attached to the camera body 1 will be described below with reference to FIGS. 7 to 15. FIG. 7 shows the camera body 1
3 is an example of a flowchart showing an outline of the operation of FIG. The following processing is performed by the camera CPU 116. In addition, the camera body 1 (camera CPU 116)
DX terminal 111, adjustment terminal 108, and communication terminal 207
It is assumed that various kinds of information can be transmitted to and from the second case back 2 (D-CPU 209) via the.

First, whether the switch S1 is in the "ON" state (whether a command to start photometry and distance measurement is output)
Whether or not it is determined (step # 1). Switch S1
Is determined not to be in the "ON" state (step # 1
If NO, the process returns to step # 1 (it is in a standby state until the switch S1 is in the "ON" state). When it is determined that the switch S1 is in the “ON” state (YES in step # 1), the switch SREC of the second back cover 2 is
Is read, and it is determined whether or not the switch SREC is in the “ON” state (whether in the REC mode, that is, in the state in which the second case back 2 can be photographed) (step # 3). ).

If it is determined that the switch SREC is not in the "ON" state (NO in step # 3), the process returns to step # 1. When it is determined that the switch SREC is in the “ON” state (YES in step # 3), the lens information acquisition unit 152 acquires lens information including focal length information from the lens unit 106 (step ##).
5). Then, the CC stored in the flash memory 205 of the second case back 2 by the device information take-in unit 151.
Device information including the size of D and the pixel size is D-CP.
It is acquired via U209 or the like (step # 7).

Then, a photometric command is output to the photometric unit 104, the photometric operation is performed by the photometric unit 104, and the photometric result is acquired (step # 9). Next,
The distance measuring command is output to the distance measuring unit 112, and the distance measuring unit 11
The distance measurement operation is performed by 2 to obtain the distance measurement result, and the AF operation command is output to the AF motor drive unit 113 based on the distance measurement result (step # 11).
Then, it is determined whether or not the switch S2 is in the "ON" state (a state in which a command to start exposure is output) (step # 13).

When it is determined that the switch S2 is not in the "ON" state (NO in step # 13), step #
Return to 1. When it is determined that the switch S2 is in the "ON" state, the battery check is performed (step # 15). That is, when the voltage of the battery 101 is equal to or lower than the predetermined value, it is determined that the photographing operation is impossible until the battery is replaced, and the standby state is entered.
Then, in order to prepare for the exposure operation, the mirror is raised (withdrawn from the optical axis) to guide the subject image to the imaging surface (step # 17). Next, the aperture value and the shutter speed are obtained, an exposure operation command is output to the aperture section 115 and the shutter section 114, and the exposure operation is performed by the aperture section 115 and the shutter section 114 (step # 1).
9). Then, the image data of the electronic image pickup unit 201 is transferred to the D-CPU 209 of the second case back.
The command to be transferred to is output (step # 21).

Next, the photometric operation performed in step # 9 of FIG. 7 will be described with reference to FIGS. FIG. 8 is an example of a layout view of a photometric area in the photometric unit 104 when the first case back 3 is attached to the camera body 1. As shown in FIG. 8, inside the entire photometric area TRS corresponding to the entire imaging area (one frame of silver salt film),
1 with 3 rows in the vertical direction and 1/2 pitch in the horizontal direction
Three photometric areas (referred to as divided areas) R1 to R13 are arranged. The region R0 corresponding to the entire photometric region TRS is also one photometric region. A light receiving element formed of a photoelectric conversion element such as a photodiode is provided corresponding to each divided region. Furthermore, the weight value shown in each area of the figure is set to each divided area. For example, the weight value of the central divided area R7 is set to "8", and the weight value of the divided area R0 corresponding to the entire screen is set to "1". The appropriate exposure amount can be obtained by adding the product of the light receiving amount of each divided region and the weight value of each region.

In this way, the first back cover 3 is attached to the camera body 1.
When is attached, 1 of the silver salt film that is the imaging area
Since the size of the frame is constant, the weight value set in each divided area can use a preset value. However, when the second case back 2 is attached to the camera body 1, the image pickup area changes depending on the CCD size, so the weight value needs to be changed based on the CCD size.

FIG. 9 is an example of a detailed flowchart of the photometric operation performed in step # 9 of FIG. Here, it is assumed that the photometric area is preset to a predetermined size and is divided into a predetermined number of divided areas. Furthermore, it is assumed that a predetermined weight value used when obtaining the appropriate exposure amount is preset in each divided area.

First, the CC mounted on the mounted back cover 2
The size of D, that is, the lateral length HC (here,
For convenience, it is called the horizontal length and the vertical length LC (here,
For convenience, it is read in the vertical length (step # 20).
1). Then, it is determined whether or not the horizontal length HC of the CCD is equal to or larger than the preset horizontal length HS of the imaging region (step # 203). If it is determined that the horizontal length HS of the imaging region is not equal to or more than that (NO in step # 203), the process proceeds to step # 207. When it is determined that the horizontal length HS of the imaging region is equal to or greater than YE in step # 203.
In S), it is determined whether or not the vertical length LC of the CCD is equal to or larger than the preset vertical length LS of the imaging region (step # 205). If it is determined that the vertical length LS of the imaging region is equal to or greater than (YES in step # 205), the process proceeds to step # 209. When it is determined that the vertical length LS of the imaging region is not greater than or equal to (N in step # 205)
For (O), the process proceeds to step # 207.

Whether NO is determined in step # 203,
Alternatively, when NO is determined in step # 205 (that is, when a part of the photometric area is outside the imaging area), at least a part of the photometric area has a weight of a divided area outside the imaging area. The value is changed to "0" (step # 207). Then, the light exposure amount of each divided area is multiplied by the weight value of each area and added to obtain the appropriate exposure amount (step # 209).

FIG. 10 is an example of a layout view of the photometric areas in the photometric section 104 when the second case back 2 is attached to the camera body 1. (A) is the case where the photometric area TRC is inside the imaging area SC1 (when the CCD size is larger than a predetermined size), and (b) is the photometric area TRC.
Is outside the imaging area LC2 (when the CCD size is smaller than a predetermined size). Here, the grid lines in the figure are the boundaries of the divided areas that divide the photometric area TRC into a predetermined number, and the numbers in each divided area are the weight values of the divided areas. In addition, the photometric area TRC
Is divided into 10 divided areas both vertically and horizontally (that is, the photometric area TRC is composed of 100 divided areas).

As shown in (a), when the photometric region TRC is inside the image pickup region SC1, the preset weight value is used for calculating the proper exposure amount. on the other hand,
As shown in (b), when a part of the photometric area TRC is outside the imaging area SC2, the weight value of the divided area, at least a part of which is outside the imaging area, is changed to “0” and changed. The proper exposure amount is obtained by using the later weight value.

In this embodiment, the case where the weight value is changed according to the CCD size has been described.
Alternatively, the photometric area and the weight value may be set according to the CD size. For example, for each CCD size mounted on the second back cover 2, the corresponding photometric area and weight value are stored in the lookup table in advance, and based on the CCD size read in step # 7 of FIG. The metering area and the weight value may be set. In this case, more appropriate photometry is performed.

Next, the AF operation performed in step # 11 of FIG. 7 will be described with reference to FIGS. 11 and 12. FIG. 11 is an example of a detailed flowchart of the AF operation performed in step # 11 of FIG. First, the focusing condition setting unit 153 reads the CCD size and the CCD pixel size (step # 3).
01). Then, the focusing condition setting unit 153 uses the read CCD size and CCD pixel size to
A focus width TH for determining whether or not the focus is achieved is obtained (step # 303). Here, the look-up table that defines the CCD size shown in FIG.
02, the focusing width TH is obtained from this look-up table using the CCD size and the CCD pixel size read by the focusing condition setting unit 153.

FIG. 12 is an example of a chart showing the relationship between the CCD size and the CCD pixel size and the focusing width TH. The first line is the CCD size, which is represented here by the length of the diagonal of the imaging area in inches.
The second line is the CCD pixel size, which is represented here by how many times the reference size PO. The reference size PO is, for example, a pixel size of a CCD having a CCD size of 4/3 inch and a pixel number of 5 million pixels, and is a square having one side of approximately 10 microns (μm).
The third line is the focus determination width TH, which is in microns (μm)
Is expressed as a unit.

For example, in the case of a CCD whose CCD size is 4/3 inch and whose CCD pixel size is PO,
The focus determination width TH is set to 80 μm. Also CCD
The size is 1/3 inch, and the CCD pixel size is 1 /
In the case of a CCD that is 4 PO, the focus determination width TH is 20.
It is set to μm. The focus determination width TH in the case of a silver salt film is 100 μm, for example. That is, in the case of CCD, the focus determination width TH is set to a smaller value than in the case of a silver salt film, and further, the smaller the CCD size (or the smaller the CCD pixel size), the focus determination is made. A small value is set for the width TH.

In this way, in step # 303 of the flow chart shown in FIG. 11, the lookup table for defining the CCD size and the relationship between the CCD pixel size and the focusing width TH as shown in FIG. 12 is used. The focus width TH is required. In the present embodiment, the case where the focus width TH is obtained using the look-up table has been described, but the focus width TH is also obtained using a preset calculation formula from the CCD size and CCD pixel size. Good.

Returning again to the flow chart shown in FIG. 11, the distance measuring command is output to the distance measuring unit 112, the distance measuring operation is performed, and the distance measuring result is obtained (step # 30).
5). Then, the defocus amount is calculated using the distance measurement result (step # 307). Then, it is determined whether or not the absolute value of the defocus amount is less than or equal to the focusing width TH (step # 309).

If it is determined that the focus width is not less than or equal to TH (NO in step # 309), the lens drive amount corresponding to the defocus amount is calculated, and the AF motor drive unit 1 is operated.
A lens drive command is output to 13 (step # 3
11) and returns to step # 305. When it is determined that the focus width is equal to or less than the focus width TH (YES in step # 309), for example, the release state is set and the focus state such as focus display is set (step # 313).

Next, referring to FIG. 13 to FIG.
The exposure operation performed in step # 19 will be described. FIG. 13 is an example of a detailed flowchart of the exposure operation performed in step # 19 of FIG.
The following processing is performed by the exposure condition setting unit 154. First, the image magnification β and the focal length fl of the lens are read (step # 401). Then, the image magnification β
And the focal length fl of the lens, the time value (Time) of the proper exposure amount EV obtained in step # 9 of FIG.
Value) TV and Aperture Va
The distribution coefficient α, which is a coefficient that defines the condition for distribution to the (lue) AV, is obtained (step # 403). Here, a look-up table that defines the relationship between the image magnification β and the lens focal length fl and the distribution coefficient α shown in FIG. 14 is stored in the EEPROM 102 in advance, and the image magnification read by the exposure condition setting unit 154 is stored. The distribution coefficient α is obtained from this lookup table using β and the focal length fl of the lens.

Here, the distribution coefficient α will be described. First, the relationship between the proper exposure amount EV and the time value TV and the aperture value AV of the proper exposure amount EV will be described. Proper exposure amount E
V and the time value TV and the aperture value AV of the proper exposure amount EV satisfy the following equation (1). EV = TV + AV (1) Here, shutter speeds T and F in units of time (seconds)
The relationship between the aperture value A represented by the value and the appropriate exposure EV is
It is expressed by the following equation (2). EV = log ₂ (A ² / T) (2) Then, the above-mentioned time value TV and aperture value AV are defined by the following equations (3) and (4) using the shutter speed T and aperture value A, respectively. To be done. TV = log ₂ (1 / T) (3) AV = log ₂ A ² (4) Expression (1) is derived from Expressions (2) to (4).

The distribution coefficient α is a coefficient that defines a condition for distributing the proper exposure amount EV to the time value TV and the aperture value AV when the proper exposure amount EV in the equation (1) is given. Here, the distribution coefficient α is a value in the range of 0 to 1, and as the distribution coefficient α is larger, the time value TV is larger (the shutter speed T is faster) and the aperture value AV is smaller (the aperture value A is smaller). ). A detailed description of the distribution coefficient α will be given later with reference to FIG. 15.

FIG. 14 is an example of a chart showing the relationship between the image magnification β, the focal length fl of the lens and the distribution coefficient α. The first row is the image magnification β, and the first column is the focal length fl in millimeters (mm). The figures in the other figures are the values of the distribution coefficient α. For example, the image magnification β is “1/10” and the focal length fl is “35 m.
In the case of “m”, the distribution coefficient α is set to “20/255”. When the image magnification β is “1/500” and the focal length fl is “50 mm”, the distribution coefficient α is set to “200/255”.

Thus, in step # 403 of the flow chart shown in FIG. 13, a look-up table for defining the relationship between the image magnification β, the lens focal length fl and the distribution coefficient α as shown in FIG. The distribution coefficient α is obtained by using. Here, the image magnification β is interpolated by linear interpolation (internal division) to obtain the distribution coefficient α. In the present embodiment, the case where the distribution coefficient α is obtained using the look-up table has been described, but the distribution coefficient α is calculated from the image magnification β and the lens focal length fl using a preset formula. The desired form may be used.

Returning again to the flowchart shown in FIG. 13, the distribution coefficient α is corrected based on the CCD size (step # 405). As described above, the smaller the CCD size, the better the image quality when the aperture value AV is set to the narrowing side. Therefore, the smaller the CCD size, the smaller the distribution coefficient α (that is, the larger the aperture value AV) is corrected. Then, the proper exposure amount E
V and the distribution coefficient α obtained in step # 405
Then, the time value TV and the aperture value AV are obtained using the program diagram shown in FIG. 15 (step # 407).

Here, in step # 411, FIG.
A method of calculating the time value TV and the aperture value AV performed using the program diagram shown in FIG. Figure 15 shows
It is an example of a program diagram. The horizontal axis represents the time value TV and the vertical axis represents the aperture value AV. The shutter speed T and the aperture value A are shown in parentheses on the horizontal axis and the vertical axis, respectively. The condition for obtaining the appropriate exposure amount EV is represented by a straight line LE having a downward sloping slope of "-1" as shown by the dotted line in the figure. For example, when the proper exposure amount EV is "15", the following equation (5) is obtained from the equation (1). AV = 15-TV (5)

The condition for the distribution coefficient α to satisfy "0" is that the time value TV is the minimum value TV0 (here, "7") of the hand movement blurring limit. This condition is expressed by the following equation (6), and is expressed by a straight line LA0 parallel to the vertical axis in FIG. On the other hand, the condition for the distribution coefficient α to satisfy “1” is the maximum value TV1 (here, “12”) that the time value TV can use. This condition is represented by the following equation (7), and in FIG. 15, it is represented by a straight line LA1 parallel to the vertical axis. TV = TV0 (= 7) (6) TV = TV1 (= 12) (7)

The condition for the distribution coefficient α to satisfy "0.25" is shown by the broken line LA2 in the figure.
When the distribution coefficient α is in the range of 0 to 0.25,
The polygonal line is an upwardly rising polygonal line that passes through the points RA and P1 passing through the area RA1 with the diagonal line descending to the lower right. When the distribution coefficient α is in the range of 0.25 to 1, the point P0 passes through the range of the area RA2 shaded in the upper right of the figure.
And a straight line going up to the right through P1. Where point P
0 is the intersection of the polygonal line LA2 and the straight line LA0, and the point P1
Is the intersection of the polygonal line LA2 and the straight line LA1. However,
When the distribution coefficient α is larger than “0” and smaller than “1”, for an area having a later-described minimum opening value AV0,
The straight line LA0 is obtained, and the straight line LA1 is obtained in a region where the maximum aperture value AV1 is more than described later.

The relationship between the distribution coefficient α and the polygonal line defined by the distribution coefficient α when the value of the distribution coefficient α is larger than “0” and smaller than “1” will be described. First, using a minimum aperture value AV0 (here, “1”), which will be described later, using a line segment LA3 defined by the following equation (8) and a maximum aperture value AV1 (here, “9”), Consider the line segment LA4 defined by the equation (9). AV = AV0 (= 1) (where TV0 ≦ TV ≦ TV1) (8) AV = AV1 (= 9) (where TV0 ≦ TV ≦ TV1) (9)

Next, a line segment LA01 which is a part of the straight line LA0 and whose aperture value AV satisfies AV0≤AV≤AV1.
And the aperture value AV is AV0 which is a part of the straight line LA1.
Consider a line segment LA11 that satisfies ≦ AV ≦ AV1.

Then, an intersection point P between the straight line LE defined by the proper exposure amount EV and the line segment LA3 or the line segment LA11.
11 and an intersection point P01 between the straight line LE and the line segment LA4 or LA01 defined by the appropriate exposure amount EV. The polygonal line defined by the distribution coefficient α is the intersection point P0.
The line segment LE1 having both ends of 1 and the intersection P11 is α: (1
-Α) is a set of points internally divided.

The time value TV and the aperture value AV are obtained as the coordinates of the intersection of the straight line LE defined by the proper exposure amount EV and the polygonal line (or straight line) LA defined by the distribution coefficient α in the program diagram. To be For example,
The proper exposure amount EV is “15” and the distribution coefficient α is 0 “0.2.
In the case of "5", the time value TV becomes "8.5" and the aperture value AV becomes "6.5".

Returning again to the flowchart shown in FIG. 13, based on the CCD size, the maximum aperture value AV1 which is the maximum aperture value AV and the minimum aperture value AV0 which is the minimum aperture value AV can be taken. Are required (step # 409). Here, a look-up table that defines the relationship between the CCD size and the maximum aperture value AV1 and the minimum aperture value AV0 is stored in the EEPROM 109 in advance, and the maximum aperture value AV is stored using this lookup table.
1 and the minimum aperture value AV0 are obtained.

Next, it is judged whether or not the opening value AV is equal to or larger than the minimum opening value AV0 (step # 41).
1). When it is determined that the opening value AV is not equal to or larger than the minimum opening value AV0 (NO in step # 411), the opening value AV and the time value TV are changed by the correction amount ΔAV0 defined by the following equation (10-1). Next (10-2) and (10-
It is corrected using the equation (3) (step # 413). Then, an exposure operation command including the aperture value AV and the time value TV is output to the shutter unit 114 and the diaphragm unit 115 (step # 419), and the process is ended. ΔAV0 = AV0−AV (10-1) AV ← AV + ΔAV0 (10-2) TV ← TV−ΔAV0 (10-3) When it is determined that the opening value AV is equal to or larger than the opening minimum value AV0 (YES in step # 411). ), It is determined whether the opening value AV is less than or equal to the maximum opening value AV1 (step # 415).

When it is determined that the opening value AV is not less than the maximum opening value AV1 (NO in step # 415),
The aperture value AV and the time value TV are the following (11-2) and (11) by the correction amount ΔAV1 defined by the following equation (11-1).
-3) is used for correction (step # 417). Then, an exposure operation command including the aperture value AV and the time value TV is output to the shutter unit 114 and the diaphragm unit 115 (step # 419), and the process is ended. ΔAV1 = AV-AV1 (11-1) AV ← AV-ΔAV1 (11-2) TV ← TV + ΔAV1 (11-3)

If it is determined that the aperture value AV is less than or equal to the maximum aperture value AV1 (YES in step # 415),
The aperture value AV for the shutter 114 and the diaphragm 115
And an instruction of the exposure operation including the time value TV are output (step # 419), and the processing is ended.

Step # of the flow chart shown in FIG.
The purpose of correcting the opening value AV and the time value TV in step 413 and step # 417 is that the opening value AV is equal to or larger than the opening minimum value AV0 in the program diagram shown in FIG.
In addition, it is for making the aperture maximum value AV1 or less. For example, when EV = 10 and α = 1, the point P30
To P31, and when EV = 20 and α = 0, the point is corrected from P40 to P41.

As described above, since the focusing width TH is obtained based on the CCD size and the CCD pixel size, an appropriate focusing width TH is set. Therefore, since the in-focus determination is performed using the appropriate in-focus width TH thus obtained, the in-focus determination suitable for the CCD size and the CCD pixel size can be performed.

Further, since the weight value used for calculating the proper exposure amount based on the CCD size is set, the proper exposure amount suitable for the CCD size can be obtained.
Further, the distribution coefficient α is calculated based on the focal length fl of the lens and the CCD size, and the time value TV and the aperture value AV are calculated using the distribution coefficient α and the proper exposure amount EV. A time value TV and an aperture value AV that match the fl and CCD size are determined. Further, since the time value TV and the opening value AV are obtained using the program diagram, the time value TV and the opening value A can be simply and accurately obtained.
V can be obtained. Then, since the exposure control is performed using the time value TV and the aperture value AV thus obtained, it is possible to perform the exposure control suitable for the focal length fl of the lens and the CCD size.

The present invention can take the following forms.

(A) In this embodiment, the case where the element information includes the CCD size and the pixel size has been described. However, the element information may include at least one of the CCD size and the pixel size.

(B) In this embodiment, the case where the focusing condition setting unit 153 and the exposure condition setting unit 154 set the focusing condition and the exposure condition based on the element information has been described. 153 and exposure condition setting unit 15
At least one of 4 is a condition (focus,
An exposure condition may be set.

[0103]

According to the first aspect of the present invention, since the focus determination condition is set based on the element information, the proper focus determination condition can be easily set. Further, since the exposure condition is set based on the element information, the proper exposure condition can be easily set.

According to the second aspect of the present invention, appropriate exposure conditions can be set easily and easily.

According to the invention of claim 3, more appropriate exposure conditions can be set.

According to the fourth aspect of the present invention, it is possible to easily make a proper focus determination.

According to the fifth aspect of the present invention, it is possible to realize a camera in which proper focusing conditions and exposure conditions are set when the second case back is attached.

[Brief description of drawings]

FIG. 1 is an example of a block diagram showing a configuration of a main part of a camera body according to the present invention.

FIG. 2 is an example of a block diagram showing a configuration of a main part of a second case back.

FIG. 3 is an example of a configuration diagram of a first case back.

FIG. 4 is an example of a configuration diagram of a second case back.

FIG. 5 is an example of a configuration diagram of a state where a second case back is attached to the camera body.

FIG. 6 is an example of a functional configuration diagram of a main part in the camera CPU of the camera body.

FIG. 7 is an example of a flowchart showing an outline of the operation of the camera body.

FIG. 8 is an example of a layout view of a photometric area in the photometric unit when the first back cover is attached to the camera body.

9 is an example of a detailed flowchart of a photometric operation performed in step # 9 of FIG.

FIG. 10 is an example of a layout view of a photometric area in the photometric unit when the second case back is attached to the camera body.

11 is an example of a detailed flowchart of an AF operation performed in step # 11 of FIG.

FIG. 12 is an example of a chart showing a relationship between a CCD size and a CCD pixel size and a focusing width.

FIG. 13 is an example of a detailed flowchart of an exposure operation performed in step # 19 of FIG.

FIG. 14 is an example of a chart showing the relationship between the image magnification, the focal length of the lens, and the distribution coefficient.

FIG. 15 is an example of a program diagram.

[Explanation of symbols]

1 camera body 104 Light meter 106 lens part 108 Adjustment terminal 111 DX terminal 112 Distance measuring unit 113 AF motor drive unit 114 shutter 115 throttle 116 camera CPU 151 Element Information Acquisition Unit (Element Information Acquisition Means) 152 Lens Information Acquisition Unit (Lens Information Acquisition Means) 153 Focusing condition setting unit (focusing condition setting means) 154 Exposure Condition Setting Section (Exposure Condition Setting Means) 2 Second case back 201 electronic imaging unit 207 Communication terminal 209 D-CPU

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03B 17/02 H04N 5/232 A 5C022 19/08 5/235 H04N 5/225 101: 00 5/232 G02B 7/11 N 5/235 C // H04N 101: 00 G03B 3/00 A (72) Inventor Kenichi Ozaki 2-3-13 Azuchicho, Chuo-ku, Osaka Osaka Kokusai Building F term in Minolta Co., Ltd. (reference) ) 2H002 AB00 CC31 DB02 DB06 DB14 DB20 DB24 DB25 DB31 DB32 FB36 FB37 GA00 GA54 GA55 HA04 JA01 JA07 JA09 2H011 BA21 DA00 2H051 BA02 DA39 DB00 2H054 AA01 BB00 BB07 BB11 AC78 AB21 CC21 CC42 CC21 CC05 CC07 CC07 CC05 CC07 CC07 CC05 CC07

Claims (5)

[Claims] 1. A structure in which, instead of the first back cover that shields the silver salt film from light, a second back cover on which a solid-state image sensor is mounted can be mounted, and the first and second back covers are mounted. A device main body that constitutes a camera by mounting one of the device information collection device, which captures device information including at least one of the size of the solid-state imaging device and the pixel size when the second case back is mounted. A camera, and at least one of a focusing condition setting unit that sets a focusing determination condition based on the element information and an exposure condition setting unit that sets an exposure condition based on the element information. Body. 2. A lens information fetching means for fetching lens information including focal length information of the photographing lens, wherein the exposure condition setting means sets the exposure condition based on the focal length information. The camera body described in 1. 3. The camera body according to claim 1, wherein the focusing condition setting unit sets a focusing determination width for determining whether or not the subject is in focus. 4. The camera body according to claim 1, wherein the exposure condition setting means sets the exposure condition using a program diagram. 5. A camera comprising one of the first and second back covers mounted on the camera body according to claim 1.