JPH05196863A - Focusing device of camera - Google Patents

Abstract

PURPOSE:To adjust the focusing point with high precision at all times even if a mounted interchangeable lens is different by detecting the quantity of out-of- forcus on a camera main body side, sending information on the quantity of defocusing to the interchangeable lens side, and finding the quantity of driving at the interchangeable lens. CONSTITUTION:A main CPU in the camera main body calculates the quantity of out-of-forcus of the interchangable lens 500 mounted on the camera main body. Then the divergence of forcus quantity data is sent from the data input/ output terminal of the main CPU through an input/output control circuit. This defocusing quantity is inputted to a sub-CPU 501 in the interchangeable lens 500 and the camera enters a stand-by state. Then when a specific signal is sent from the control signal output terminal of the main CPU, a control signal corresponding to the defocusing quantity data is sent from the control output terminal X of the sub-CPU 501 to a driving circuit 511. The driving circuit 511 drives a motor 512 according to the inputted control signal to rotate a focus ring, and thus extends or contracts and stops the lens by a necessary quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focusing device for a camera,
More specifically, the present invention relates to a focus adjustment device for a camera, in which an interchangeable lens is detachably attached to a camera body.

[0002]

As is well known, in cameras such as single-lens reflex cameras in which an interchangeable lens is detachably attached to the camera body, focus detection is performed on the camera body side, and the result of this focus detection is Based on this, the focus lens of the interchangeable lens is driven.

[0003]

However, when the interchangeable lens is driven according to the focus information detected on the camera body side, the amount of drive varies depending on the interchangeable lens even if the amount of defocus is the same. Therefore, it is difficult to perform highly accurate focusing drive for each different interchangeable lens. An object of the present invention is to detect the amount of defocus on the camera body side, transmit the information on the amount of defocus to the interchangeable lens side, and obtain the drive amount on the interchangeable lens side in order to solve the above-mentioned conventional problems. Accordingly, it is an object of the present invention to provide a focusing device for a camera, which is capable of highly accurate focusing adjustment.

[0004]

A focusing device for a camera according to the present invention comprises focus detecting means for detecting a defocus amount of the interchangeable lens based on an object image received through the interchangeable lens in a camera body. A main microcomputer for controlling the camera system and a transmission means for transmitting the data indicating the defocus amount, and driving means for driving the focus lens in the interchangeable lens, and transmission by the transmission means And a sub-microcomputer for calculating the drive amount of the driving means based on the data received by the receiving means, and a sub-microcomputer for calculating the driving amount of the driving means. Control means for controlling the drive means based on the drive amount.

[0005]

[Function] The defocus amount is detected on the camera body side through the interchangeable lens, the data of the defocus amount is sent to the interchangeable lens side, and on the interchangeable lens side, based on this data, the sub-microcomputer uses the focus lens. The drive amount of the drive means for driving the drive means is calculated, and the drive means is controlled based on the calculated drive quantity.

[0006]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows a first embodiment of the present invention.
This example uses a 35 mm wide roll film,
The present invention is applied to a single-lens reflex camera adopting a focal plane shutter, and an electric drive unit 20 having an electric hoisting function and an electric rewinding function is attached to the bottom of the camera body 1 as an accessory unit. A power supply unit 40 for supplying power to the camera body 1 and the drive unit 20 is further attached to the bottom of the electric drive unit 20 as an accessory unit.

The camera body 1 is provided with a well-known film winding mechanism 2 for film winding and shutter charging, and a film rewinding mechanism 3 for film rewinding, and a release button 4 on the upper surface. There is. Further, the camera body 1 is provided with a main CPU 5 which is a main microcomputer for controlling the camera including the electric drive unit 20 and the power supply unit 40. The ground terminal G of the main CPU 5 is connected to an electric contact 6 arranged on the bottom of the camera body 1, and the positive power supply input terminal + is connected to an electric contact 7 arranged in the same manner as the above electric contact to input data. Output terminal DAT
A is connected to an electric contact group 8 composed of four (one in the figure) contacts arranged in the same manner as the electric contacts 6 and 7.
This electrical contact group 8 is composed of four electrical contacts corresponding to each bit so as to send and receive a 4-bit parallel signal.

A data output terminal P of the main CPU 5 is connected to a display 9 provided in a finder (not shown) for displaying a drop in voltage, underexposure and the like. The control output terminal Q is connected to the control input terminal of the photometric circuit 10, and the control output terminal R is connected to the control input terminal of the shutter drive circuit 11. The photometric circuit 10 and the shutter drive circuit 11 perform desired photometry and shutter drive according to control signals sent from the control output terminals Q and R of the main CPU 5. The control output end of the photometric circuit 10 is connected to the control input end S of the main CPU 5, and the control output end of the shutter drive circuit 11 is connected to the control input end T of the main CPU 5. Then, a contact that is interlocked with the pressing of the release button 4 is connected to the control input terminal U of the main CPU 5.

Further, the nonvolatile memory 12 is capable of writing and reading data such as the number of photographable frames of the film, and the written data is not erased even when the power is turned off.
Are connected to the main CPU 5. Further, a control input terminal V of the main CPU 5 is connected to a 1-frame detection circuit 13 which detects one-frame winding of the film and sends a 1-frame winding signal each time, and the control input of the main CPU 5 A film end detection circuit 14 for detecting the film end is connected to the end W.

On the other hand, the electric drive unit 20 has a hoisting motor 22 having a hoisting shaft 21 connected to the hoisting mechanism 2.
And a rewinding motor 24 having a rewinding shaft 23 connected to the rewinding mechanism 3 only at the time of rewinding. The electric drive unit 20 is also provided with a sub CPU 25 which is a sub microcomputer for transmitting and receiving data to and from the main CPU 5 of the camera body 1. The ground end G of the sub CPU 25 is connected to an electric contact 26 formed on the upper surface of the electric drive unit 20 so as to contact the electric contact 6, and an electric contact 27 formed on the lower surface of the electric drive unit 20. It is connected to the.

The positive power supply input terminal + of the sub CPU 25 is
It is connected to an electrical contact 28 that contacts the electrical contact 7 and an electrical contact 29 formed on the lower surface of the electric drive unit 20. Further, the data input / output terminal DATA of the sub CPU 25 is in contact with each of the electrical contact groups 8 and the electrical contact group 31 formed on the lower surface of the electric drive unit 20.
It is connected to the. In addition, the control output terminal X of the sub CPU 25
Is connected to the input end of the drive circuit 32, and the output end of the circuit 32 is connected to the hoisting motor 22.

The control output terminal Y of the sub CPU 25 is connected to the input terminal of the drive circuit 33, and the output terminal of the circuit 33 is connected to the rewinding motor 24. In addition, the sub CPU 25
A non-volatile memory 34 for storing a mode in which the film winding mode is one frame or continuous is connected to the.

The power supply unit 40 includes a power supply battery 4
1 and 42 are housed, and a power switch 43 is provided on the surface of the unit 40, the operation lever being exposed and arranged. In addition, a sub-CP that is a sub-microcomputer for transmitting and receiving data to and from the main CPU 5 of the camera body 1.
U44 is provided. Grounding end G of the sub CPU 44
Is disposed on the upper surface of the power supply unit 40, is connected to the electric contact 45 that contacts the electric contact 27 of the electric drive unit 20, and is connected to the negative electrode of the battery 42.
The positive power supply input terminal + of the sub CPU 44 is a switch circuit 46.
Is connected to the positive terminal of the power supply battery 41 via the power switch 43 of the normally open type. The output end of the switch circuit 46 is disposed on the upper surface of the power supply unit 40 and is connected to the electric contact 47 that contacts the electric contact 29.

The data input / output terminal DATA of the sub CPU 44 is arranged on the upper surface of the power supply unit 40 and is connected to the electric contact 48 which comes into contact with the electric contact group 31. In addition, the secondary CPU 44 has a nominal voltage of the battery used,
A non-volatile memory 49 capable of writing and reading data such as capacity and distinguishing between primary battery and secondary battery, and capable of retaining the contents even when the power is off is connected. Furthermore,
The control input terminal Z of the sub CPU 44 is connected to the control terminal of the switch circuit 46.

In the color device constructed as described above, when the power switch 43 is operated, the positive electrode of the power battery 41 is applied to the positive power input terminal + of the sub CPU 44 as shown in FIG. It is also applied to the input terminal of the switch circuit 46. Then, a control signal is sent from the control input terminal Z of the sub CPU 44 to the control terminal of the switch circuit 46, and accordingly, the positive electrode of the battery 41 is transferred to the sub C via the electric contacts 47 and 29.
It is applied to the positive power input terminal + of the PU 25, and further the electrical contact 2
It is applied to the positive power supply input terminal + of the main CPU 5 via 8 and 7. Then, the data input / output terminal DATA of the main CPU 5
2B to 2E, the signals b to e are sent to the data input / output terminal DATA of the sub CPU 25 via the electrical contact groups 8 and 30. , And the sub CPU 44 via the electrical contact groups 31 and 48.
Data input / output terminal DATA.

Input to the data input / output terminal DATA,
Alternatively, as the output data, 16 kinds of information can be transmitted / received by a signal composed of a hexadecimal number consisting of 4 bits of the signals b to e. Hereinafter, for convenience of explanation, the hexadecimal numbers represented by the signals b to e are represented by "".

The data input / output terminal DATA of the main CPU 5 is compared with the address codes "4" and "D", and only when they match, the data input next to the address code signal is waited. In this case, the address code signal of the power supply unit 40 is "4",
Since it is "D", the control code signals "C" and "4" input next are accepted, and the battery check operation is started. When the battery check by the sub CPU 44 is completed, the result is sent to the data input / output terminal DA of the sub CPU 44.
It is sent from TA to the main CPU 5 side. In this case, when the battery has the operating voltage, the signal "F" is transmitted,
When the battery is exhausted and does not reach the operating voltage, an "O" signal is transmitted. This signal is accepted by the main CPU 5,
When it is "F", an appropriate signal is sent from the control output terminal P of the main CPU 5 to the display device 9 to display that it is possible to shoot, and when it is "O", it means that shooting is not possible. Appropriate signals are sent to display.

Then, when the release button 4 of the camera body 1 is pressed, a trigger signal interlocking with the release button 4 is input to the control input terminal U of the main CPU 5. Main CP
U5 detects this trigger signal, and sends an appropriate control signal from the control output end R to the shutter drive circuit 11 for raising the mirror and starting the front curtain travel. Along with this, the control output terminal Q
A proper signal is sent from the photometric circuit 10 to the photometric circuit 10 and the photometric data from the photometric circuit 10 is returned to the control input terminal S of the main CPU 5. The main CPU 5 operates from the control output terminal R to the shutter drive circuit 1 based on the returned photometric data.
A control signal such as the trailing curtain traveling timing is sent to 1 to complete a series of exposure operations such as trailing curtain traveling and mirror lowering. At this time, from the shutter drive circuit 11 to the control input terminal T of the main CPU 5.
An exposure completion signal is sent to.

Then, the main CPU 5 receives this exposure completion signal and shifts to the next operation, that is, the film winding operation.
When the address code signals "3" and "E" are sent from the main CPU 5, only the sub CPU 25 of the electric drive unit 20 having the addresses "3" and "E" responds,
It waits for a control code signal input next to the address code signal. When the control code signals "5" and "9" are sent from the main CPU 5, the control code signal is accepted by the sub CPU 25, and the hoisting motor 22 is rotated from the control output end X of the sub CPU 25 to the drive circuit 32. The appropriate signal is sent to cause this. Along with this, the hoisting motor 22
Rotates, and the exposed film is wound up by one frame.

At this time, the hoisting mechanism 2 in the camera body 1
A one-frame winding signal is sent to the control input terminal V of the main CPU 5 from the one-frame detecting circuit 13 using a part of the above. As described above, a series of operations from pressing the release button 4 to winding the exposed film is repeated.

The one-frame winding signal from the one-frame detecting circuit 13 is sequentially written as an integrated value in the non-volatile memory 12 via the main CPU 5. When the content of the non-volatile memory 12 reaches a value preset by the number-of-image-capable-frames setting means (not shown), the main CPU 5 shifts to the rewind operation. This is because the address code signals "3" and "E" are sent from the data input / output terminal DATA, and only the sub CPU 25 of the electric drive unit 20 responds to this signal, and the address code signal is input next to the address code signal. Wait for the control code to be sent. Main CP
When the control code signals "5" and "8" are sent from U5, only the sub CPU 25 accepts this signal, and the control output terminal Y sends a proper control signal to the drive circuit 33 to perform the rewinding operation. Rewinding shaft 23 connected to rewinding motor 24
Is coupled to a rewinding mechanism to rewind the film that has been exposed by a predetermined number of frames.

When the rewinding by the rewinding motor 24 is completed, the end detection signal from the film rewinding end detection circuit 14 provided in the camera body 1 is input to the control input terminal W of the main CPU 5. Then, the data input / output terminal D of the main CPU 5
Address code signals "3" and "E" are sent from the ATA to the sub CPUs 25 and 44. The sub CPU 25 responds to this address code signal and waits for a control code input next to this address code signal. Main C
When the control code signals “6” and “A” are sent from the PU 5, the control output terminal Y of the sub CPU 25 drives the drive circuit 33.
An appropriate control signal for stopping the rewinding operation is sent to the control input terminal of, and the rewinding operation is stopped. ◎ In this way, the battery check operation, exposure operation, winding operation, and rewinding operation are performed.

FIG. 3 shows an example of a connecting structure for connecting the camera body 1, the electric drive unit 20 as an accessory unit, and the power supply unit 40. In FIG. 3, a positioning projection 51 is formed on one side surface of the camera body 1, and a through hole 52 is formed on the other side surface thereof. 5
3 is fitted, and a spring 5 for urging the movable pin 53 to the outside of the camera body 1 is attached to the bottom of the movable pin 53.
4 are provided.

The electric drive unit 20 is attached to the bottom of the camera body 1 provided with the protrusion 51 and the movable pin 53. That is, the flange portion 56 having the hole 55 into which the protrusion 51 is inserted is integrally provided on one side surface of the electric drive unit 20, and the movable pin 53 is inserted into one side surface of the upper portion. With a hole 57,
A collar portion 59 having an inclined surface 58 is provided.

A coupling mechanism similar to the above is also provided between the lower portion of the electric drive unit 20 and the upper portion of the power supply unit 40. Therefore, the same reference numerals are given to the corresponding portions, and the detailed description thereof will be omitted. Since each part is configured in this way, the electric drive unit 20 can be removed from the bottom of the camera body 1 and the power supply unit 40 can be directly attached to the bottom surface of the camera body 1.

Next, a second embodiment of the present invention will be described in detail with reference to FIGS. In FIG. 4, the camera body 10
An electric drive unit 200 is removably attached to the bottom surface of 0, a power supply unit 300 is removably attached to the bottom surface of the electric drive unit 200, and is provided above the camera body 100. A strobe unit 400 is detachably attached to the accessory shoe 130, and an auto-focus type photographing lens unit 500 is attached to a lens mount portion provided on the front surface of the camera body 100 to obtain a desired photographing. The camera is configured to do so.

The camera body 100 has a main CPU 101, which is a main microcomputer, for complexly controlling an accessory unit, that is, an electric drive unit 200, a power supply unit 300, a strobe unit 400, a lens unit 500 and the like. Are arranged. In addition, each of the units 200, 300, 400 and 500 has the main C described above.
Sub CPUs 201 and 30 which are sub microcomputers for transmitting and receiving information signals to and from the PU 101
1, 401, 501 are provided.

The ground end G of the main CPU 101 of the camera body 100 is grounded, and the electric contact 102 formed on the shoe 130 and the electric contact 10 formed on the bottom portion.
3, electrical contact 10 formed on the front lens mount
The three of 4 are also commonly connected and grounded. Same CP
The positive power source input end + of U101 is an electric contact 105 formed on the shoe 130 and an electric contact 10 formed on the bottom.
6, electrical contacts 10 formed on the front lens mount
7 are commonly connected.

The control signal output terminal CONT of the main CPU 101 is provided to the electric contact 108 formed on the shoe 130, the electric contact 109 formed on the bottom, and the electric contact 110 formed on the front lens mount. Commonly connected. The data input / output terminal DATA of the main CPU 101 has an electrical contact 112 formed on the shoe 103 and a bottom portion through an input / output control circuit 111 that converts a parallel signal into a serial signal during transmission and a serial signal into a parallel signal during reception. Are commonly connected to the electric contact 113 formed on the front surface and the electric contact 114 formed on the front lens mount portion.

A control output end P of the main CPU 101 is connected to a control input end of an automatic exposure circuit (hereinafter referred to as an AE circuit) 115, and a control input end Q of the main CPU 101 is connected to a control output end of the AE circuit 115. Are connected. on the other hand,
The control output end R of the main CPU 101 is connected to the control input end of a focus state detection circuit (hereinafter referred to as AF circuit) 116, and the control input end S of the main CPU 101 is connected to the AF circuit 11
6 control output terminals are connected. In addition, the main CPU
Reference numeral 101 denotes a ROM 11 in which a predetermined program is stored
7 is connected to a non-volatile memory 118 capable of writing and reading temporary data such as the number of film winding frames. Further, the camera body 100 is provided with a film drive mechanism 119 for winding and rewinding the film.

Further, as is well known, the movable mirror 120 is arranged in the camera body 100. The base end of the movable mirror 120 is a mirror which is closed by a lever connected to the mirror. A switch 121 is provided. The electric drive unit 200 is connected to the film drive mechanism 119, and the drive motor 2 has a drive shaft 202 that can selectively rewind the film.
03 is provided.

The ground end G of the sub CPU 201 is grounded, and the electric contact 204 formed on the top and the electric contact 2 formed on the bottom so as to come into contact with the electric contact 103.
05 is commonly connected and grounded. Same sub CPU
The positive power supply input end + of 201 is commonly connected to an electric contact 206 formed on the top and an electric contact 207 formed on the bottom so as to come into contact with the electric contact 106. Control signal output terminal CON of the sub CPU 201
T is commonly connected to the electric contact 208 formed on the top and the electric contact 209 formed on the bottom so as to come into contact with the electric contact 109.

Data input / output terminal DAT of the sub CPU 201
A is an electrical contact 211, which is formed on the upper part and is in contact with the contact 113 through an input / output control circuit 210 for converting a parallel signal to a serial signal at the time of transmission and a serial signal to the parallel signal at the time of reception, and a bottom part. Connected to the electrical contact 212 formed on the. And deputy CP
The control output end T of U201 is connected to the input end of a drive circuit 213 that controls the drive motor 203.
The output end of 3 is connected to the drive motor 203. Further, the sub CPU 201 has a ROM 214 in which an address code of the electric drive unit 200 and the like are stored, and a temporary data writing and reading operation such as whether the electric hoisting mode is the one-frame hoisting mode or the continuous hoisting mode. A non-volatile memory 215 that can be connected is connected.

Sub CPU 301 of the power supply unit 300
The ground end G is grounded, and the electric contact 302 formed on the upper part and in contact with the electric contact 205 is also grounded. The control signal output terminal CONT of the sub CPU 301 is formed on the upper portion and is connected to the electric contact 303 formed so as to come into contact with the electric contact 209. The data input / output terminal DATA of the sub CPU 301 is in contact with the electrical contact 212 via an input / output control circuit 304 that converts a parallel signal into a serial signal during transmission and a serial signal into a parallel signal during reception. It is connected to the contact 305.

The battery 306 housed in the power supply unit 300 has its negative electrode grounded and its positive electrode is the battery 307.
Is connected to the negative electrode of. The positive electrode of the battery 307 is connected to the input end of the switch circuit 308, and is also connected to the positive power supply input end + of the sub CPU 301 via the power switch 309 whose operation lever 309a is exposed to the outside.
The output end of the switch circuit 308 is connected to an electric contact 310 which is formed on the top and is in contact with the electric contact 207. In addition, the sub CPU 301 includes a power supply unit 300.
The ROM 311 in which the address code and the like are stored is connected to the non-volatile memory 312 that can temporarily write and read data such as whether the battery used is a primary battery or a secondary battery.

Sub CPU of the strobe unit 400
The ground end G of 401 is grounded, and the electrical contact 402 formed at the bottom so as to contact the electrical contact 102 and the contact 403 provided at the top are commonly connected and grounded. .. The positive power source input end + of the sub CPU 401 has an electric contact 404 formed at the bottom and in contact with the electric contact 105, and an electric contact 40 provided at the top.
5 and 5 are commonly connected. The control signal output terminal CONT of the sub CPU 401 is commonly connected to an electrical contact 406 formed at the bottom and in contact with the electrical contact 108 and an electrical contact 407 provided at the top.
The data input / output terminal DATA of the sub CPU 401 is
An electrical contact 409 that is in contact with the electrical contact 112 via an input / output control circuit 408 that converts a parallel signal into a serial signal during transmission and that converts a serial signal into a parallel signal during reception, and an electrical contact formed on the top. 410
Are commonly connected to. Further, the control output terminal V of the sub CPU 401 is connected to the control input terminal of the strobe control circuit 411, and the control output terminal of the strobe control circuit 411 has a sub C terminal.
It is connected to the control input terminal W of the PU 401. Furthermore, the sub CPU 401 is connected to a ROM 412 storing the address code of the strobe unit 400 and a non-volatile memory 413 capable of temporarily writing and reading data such as completion of charging.

The ground end G of the sub CPU 501 of the lens unit 500 shown in FIG. 5 is grounded and is formed so as to come into contact with the electric contact 104, and the electric contact 502 formed on the lens mount portion and the front surface. The additional electrical contacts 503 formed in the above are also commonly connected and grounded. The positive power supply input end + of the sub CPU 501 is formed so as to come into contact with the contact 107, and is connected to an electric contact 504 formed on the lens mount portion and an extension electric contact 505 formed on the front surface. There is. Same sub CPU50
The first control signal output terminal CONT is formed so as to come into contact with the electric contact 110, and is connected to the electric contact 506 formed on the lens mount portion and the additional electric contact 507 formed on the front surface. .. Same sub CPU50
The data input / output terminal DATA 1 has an input / output control circuit 508 that converts a parallel signal into a serial signal during transmission and a serial signal into a parallel signal during reception.
It is connected to an electric contact 509 formed on the lens mount portion so as to come into contact with the electric contact 114, and is also connected to an additional electric contact 510 formed on the front surface.

The control output terminal X of the sub CPU 501 is
A motor 512 connected to a focus ring (not shown)
Is connected to a drive circuit 511 for driving and controlling The control output terminal Y of the sub CPU 501 is connected to a drive circuit 513 for controlling the opening of the diaphragm 514.
Further, the sub CPU 501 is connected to a ROM 516 storing data unique to the lens unit 500, for example, data such as focal length, minimum aperture value, position of exit pupil, and the like, and temporary data such as aperture data and subject. A non-volatile memory 515 is connected to which data such as distance data can be written and read freely.

In the camera constructed as described above,
When the power switch 309 is turned on, the positive electrode of the battery 307 is connected to the positive power source input terminal + of the sub CPU 301, and after a predetermined time elapses, a control signal is sent from the control output terminal U of the sub CPU 301 to the switch circuit 308, as shown in FIG. The voltage is applied as indicated by the signal a in FIG. This voltage is applied to the contacts 310, 20
Is applied to the positive power source input terminal + of the CPU 201 of the electric drive unit 200 via the
6 is applied to the positive power supply input end + of the CPU 101 of the camera body 100, and further supplied to the positive power supply input end + of the sub CPU 401 of the strobe unit 400 via the electric contacts 105 and 404, and further the electric contact. 107,50
Sub-C of the lens unit 500 (see FIG. 5) via
It is applied to the positive power supply input terminal + of the PU 501. Therefore, the positive power is supplied to the sub CPUs of all the units.

Thereafter, when parallel signals "0101" and "0110" are sent from the data input / output terminal DATA of the main CPU 101, the parallel signals are converted into serial signals by the input / output control circuit 111, and the parallel signals shown in FIG.
It is converted into a serial signal of "4" and "D" like the signal b shown in (A). This signal is input to all of the input / output control circuits 210, 304, 408, 508 of the other units, serial / parallel converted, and then the sub CPU 20.
1, 301, 401, 501 data input / output terminals D
Input to ATA.

Each of the sub CPUs 201 to 501 judges whether or not it is an address code stored in its own ROM 214, 311, 412, 516, and if it is judged to be its own address code, Accept the control code to be input next, prepare for that action, and if it is not your own address code,
It does not accept the control code entered next.

Therefore, only the sub CPU 301 receives the next signal, the control codes "C" and "4", prepares for the battery check operation, and waits for the battery check start command signal. When a start signal is input from the control signal output terminal CONT of the main CPU 101 as shown by a signal c in FIG.
It is detected whether or not the terminal voltages of 6, 307 are stipulated, and if they are not stipulated, an appropriate signal is sent to a display unit (not shown) of the camera body 100 to display a defective power supply voltage. Give an alarm. On the other hand, when the power supply voltage is the specified one, the battery normal signal is sent from the data input / output terminal of the sub CPU 301, and this signal is sent
0 to the main CPU 101.

When the main CPU 101 receives the battery check OK signal of "F", it shifts to the next operation mode (unit check operation). This unit check operation is performed from the data input / output terminal DATA of the main CPU 101 to 00.
Parallel signals 11 and 1110 are sent out, and the parallel signals are converted by the input / output control circuit 111 into serial signals “3” and “E” like the signal b shown in FIG. Address codes "3" and "E" are assigned to all the sub CPUs 201, 301, 401, 501 in the same manner as described above.
However, similarly to the above, only the sub CPU 201 having the address code “3” or “E” responds, and the sub CPU 201 waits for the control code to be input next. When a control code “6” or “A”, that is, a command signal for detecting whether or not the unit is attached, is input to the sub CPU 201, the sub CPU 201 causes the main CPU 10 of the camera body to operate.
1 Sends alligator signal. Upon receiving this signal, the main CPU 101 writes the result in the memory 118.

Similarly, in the power supply unit 300, the strobe unit 400, and the lens unit 500, the operation of detecting whether or not the unit is attached is performed, and the result is written in the memory 118 via the main CPU 101. Based on the data thus written in the memory 118, the main CPU 101 partially corrects the program contents stored in the ROM 117.

Then, when a release button (not shown) is pressed, the trigger signal at this time is input to the main CPU 101. Then, a control signal is sent from the control output terminal R of the main CPU 101 to the focus detection circuit 116, and the main CPU 101
A signal corresponding to the presence or absence of focus shift and the shift amount is input to the control input terminal S of 101. As a result, if there is a focus shift, the data input / output terminal DAT of the main CPU 101
A parallel signals "1101" and "0001" are transmitted from A. This signal is subjected to parallel / serial conversion by the input / output control circuit 111 as a signal b shown in FIG. 6 (B) to become a signal "D""1". This "D""1"
The same address code is used for all sub CPUs 20 as described above.
Data input / output terminal DATA of 1,301,401,501
To the ROM 214, 311, 41 of its own
The comparison with the address code stored in 2,516 is performed. As a result, only the sub CPU 501 responds, and "D"
The control code input next to the address code "1" is awaited. Control codes “3” and “5” are sub CPU 50
1B, the data input / output terminal DATA of the main CPU 101 receives the data via the input / output control circuit 111, as shown in FIG.
Focus deviation amount data such as the signal b shown in FIG. The focus shift amount data is fetched by the sub CPU 501 and enters a standby state. When a signal c shown in FIG. 6B is sent from the control signal output terminal CONT of the main CPU 101, a control signal corresponding to the focus shift amount data is sent from the control output terminal X of the sub CPU 501 to the drive circuit 511. . The drive circuit 511 drives the motor 512 in response to the input control signal, rotates a focus ring (not shown), and extends or retracts the lens by a required amount or stops. Although the amount of lens extension and the amount of lens extension depend on the focal length of the lens, the calculation may be performed based on the focal length data stored in the ROM 516.

After the focus adjustment as described above is performed, when a control signal is sent from the control output terminal P of the main CPU 101 to the photometric circuit 115, the exposure value data from the photometric circuit 115 is transferred to the control input terminal Q of the main CPU 101. Sent to. Main CP
Based on the exposure value data, the U 101 determines whether or not the strobe should emit light, and when it is determined that the subject is bright and does not require strobe emission, the U 101 calculates the aperture value from the predetermined shutter time. ..

Next, the data input / output terminal DA of the main CPU 101
As shown in the signal b in FIG. 6B from the TA through the input / output control circuit 111, the address code of “D” and “1”,
The control codes “3” and “6” and the refinement data “01001110” are sequentially transmitted. The code and the data are fetched by the sub CPU 501 and wait for the start of the narrowing operation based on the narrowing data. Then, the control signal output terminal CONT of the main CPU 101
When the signal c shown in FIG. 6B is sent from the sub CPU
A control signal is sent from the control output terminal Y of 501 to the drive circuit 513, and the diaphragm 514 is narrowed down to a predetermined aperture.

Then, the movable mirror 120 starts to move upward based on a preset sequence program, and the front curtain of the focal plane shutter (not shown) starts to move.
The rear curtain travels based on the shutter time preset by the photometric circuit 115. When the traveling of both curtains is completed, the movable mirror 120 descends, and a series of exposure operations is completed here.

On the other hand, when it is determined that the subject is dark and the stroboscopic light emission is required, the stroboscopic light emission preparation is performed. That is, when the synchro photographing mode with the aperture priority is desired, the object distance data sent from the focus detection circuit 116 to the control input terminal S of the main CPU 101 and the ROM 11 are stored.
From the guide number data stored in 7, the aperture 514
Of the diaphragm aperture value of the drive circuit 5 from the control output terminal Y of the sub CPU 501.
13 and the diaphragm 514 is narrowed down to a predetermined aperture. Further, when the user desires the synchronized photography mode of the flash emission amount control, it is necessary from the subject distance data sent from the focus detection circuit 116 to the control input terminal S of the main CPU 101 and the manually set aperture value. The amount of light emission is calculated. Next, as shown in signal b in FIG.
Address codes “5” and “6”, control codes “7” and “B”, and light emission amount data “10010011” are sequentially transmitted from the data input / output terminal DATA of the PU 101 via the input / output control circuit 111, and the sub CPU 401 Is input to the data input / output terminal DATA. The sub CPU 401 sends data such as strobe light emission duration time from the control output terminal V to the strobe control circuit 411 in response to a control signal such as a signal c shown in FIG.

Next, the movable CPU 120 moves up by a preset sequence program, and the main CPU 101 receives the contact signal of the switch 121 which is closed midway.
From the data input / output terminal DATA to the input / output control circuit 1
As indicated by a signal b shown in FIG.
The address code "6" and the control codes "E" and "D" are sequentially sent out, and this is input to the data input / output terminal DATA of the sub CPU 401. The sub CPU 401 is sent from the control output terminal V to the strobe control circuit 411, and waits for closing of a sync contact (not shown) for strobe.

Next, the front curtain of the focal plane shutter starts to run, and when the running is completed, the synchro contact not shown is closed, the signal at this time is input to the main CPU 101, and immediately the control signal input / output terminal of the main CPU 101. A light emission start command signal is sent from CONT, and a trigger command signal is sent from the control output terminal V of the sub CPU 401 to the strobe control circuit 411 based on this signal, and a light emitting unit (not shown) emits light.

After the strobe light is emitted by the strobe unit 400, the shutter rear curtain (not shown) provided in the camera body 100 starts running, and the movable mirror 120 is moved.
Is lowered, and a series of synchronized photographing is completed, and the operation proceeds to the film winding operation which is the next operation mode.

Data input / output terminal DATA of the main CPU 101
When the address code of "3" and "E" and the control code of "5" and "9" are sent from the input / output control circuit 111 from the signal b shown in FIG. The data is input to the data input / output terminal DATA of the sub CPU 201 via the input / output control circuit 210. And the main CPU1
01 from the control signal input / output terminal CONT of FIG.
When the signal c shown in (C) is sent to the sub CPU 201,
From the control output end T of the sub CPU 201 to the drive circuit 213
A control signal is sent to the motor 203 to rotate the motor 203, and the film winding by the winding / rewinding mechanism 119 is started via the drive shaft 202 connected to the motor 203. Along with this, from the data input / output terminal DATA of the main CPU 101 through the input / output control circuit 111, the address code "3""E" and the control "5""A" shown in the signal b of FIG. 6C. And the code are transmitted, and the sub CPU 201 receives the code. Along with this, a control signal appropriate for setting the winding stop standby state is sent from the control output terminal T of the sub CPU 201 to the drive circuit 213.

When one frame winding completion detecting mechanism (not shown) provided in the camera body 100 detects one frame winding, the main CPU 101 outputs a signal c shown in FIG. 6C from the control signal input / output terminal CONT. The hoisting stop command signal shown in (1) is transmitted, and the hoisting / rewinding mechanism 119 is stopped accordingly. The one-frame winding completion signal at this time is stored in the memory 118 as an integrated value.

When one frame of film has been wound up in this way, the addresses "5" and "6" shown in signal b of FIG. 6C are transferred from the data input / output terminal DATA of the main CPU 101 through the input / output control circuit 111. The code and the control codes "7" and "A" are sequentially transmitted. This signal is sent to the sub CPU 40
1 is input to the data input / output terminal DATA, a control signal is sent from the control output terminal V of the sub CPU 401 to the strobe control circuit 411 accordingly, and a charge start command is sent from the control signal input / output terminal CONT of the main CPU 101. The signal starts charging the strobe to a main capacitor (not shown). Note that the charging operation and the hoisting operation by the electric drive unit 200 are not performed at the same time. If both operations are performed at once, a large operating current flows, causing a voltage drop in the power supply batteries 306 and 307 housed in the power supply unit 300. Is so remarkable that a satisfactory operation cannot be performed.

When the series of operations described above is repeated, the frame numbers of the memory 118 connected to the main CPU 101 are sequentially added up. When this value reaches a preset number, the data input of the main CPU 101 is entered. From output terminal DATA to FIG.
The address code "3""E" and the control code "5""B" shown in the signal b of (D) are sent to the data input / output terminal DATA of the sub CPU 201. Along with this, Deputy C
An appropriate control signal for performing the rewinding operation is sent from the control output terminal T of the PU 201 to the drive circuit 213, and the main CPU 1
01 control signal input / output terminal CONT to sub CPU
The control signal input / output terminal CONT of 201 is shown in FIG.
The rewinding start command signal shown by the signal c in (D) is applied, and thereby rewinding of the film is started. Data input / output terminal DA of the main CPU 101 with the start of film rewinding
Address code "3""E" and "5" shown in signal b of FIG. 6D from TA through the input / output control circuit 111.
When the control code "C" is input to the data input / output terminal DATA of the sub CPU 201 via the input / output control circuit 210, the film rewinding stop preparation state is set.

The film rewinding is completed when the camera body 10
0 is provided by a rewinding end detection mechanism (not shown), and in response to this, a rewinding stop command signal shown by signal c in FIG. It is sent to the CPU 201. A control signal is sent from the control output end T of the sub CPU 201 to the drive circuit 213, so that the motor 203
Is stopped, and the rewinding operation by the hoisting and rewinding mechanism 119 ends.

In the above-described second embodiment, the sub CPU 201 is attached to each of the accessory units detachably attached to the camera body 100, that is, the electric drive unit 200, the power supply unit 300, the strobe unit 400, and the lens unit 500. , 301, 401, 501 are provided, the main CPU 101 is provided in the camera body 100, and data transmission and reception between the main CPU and the sub CPU are common lines, that is, a power line, a data input / output line, and a control signal line. It is done on the track. Further, the line connection between the camera body 100 and an accessory unit such as the electric drive unit 200 is performed through a contact member.

Therefore, the attached unit can be easily enlarged or reduced. That is, a converter lens unit is mounted between the lens unit 500 and the camera body 100, or the electric drive unit 200 is removed to remove the camera body 1
The power supply unit 300 can be easily mounted directly on the bottom surface of the camera 00, and the main CPU 101 provided in the crocodile of the camera body 100 can control different modes depending on whether the accessory unit is mounted or not. Since such enlargement or reduction can be performed without changing the contact member, a camera with extremely high versatility can be obtained.

In the first and second embodiments described above, the power supply batteries 41, 42, 306, 307 are housed in the power supply unit 2, 300 separate from the camera body 1, 100, and the power supply batteries Although the operation power is supplied to each part of the accessory unit, the present invention is not limited to this example, and the power supply batteries 41, 42, 306, 307 can be housed in the camera body 1100 or other accessory. It may be stored in the unit.

The power supply to the strobe unit 400 may not be performed from the power supply unit 300, but a strobe battery may be housed in the strobe unit 400.
Further, in the above example, the signal format for transmitting and receiving data is a parallel signal or a serial signal composed of 4 bits, but it goes without saying that this may be another format, and either format is adopted. The choice of what to do is free in design.

Further, the accessory unit used in the present invention is not limited to the above-mentioned embodiment, but includes all units such as a ring strobe unit mounted on the front surface of the lens unit. Further, in the above embodiment, all of the units are the main or sub CPUs.
Is provided, but for simple units, CPU
Instead of the above, desired signal processing may be performed by a logic circuit including an AND gate circuit or an OR gate circuit.

[0063]

As described above, according to the present invention, data transmission / reception between the camera body and the accessory unit and control signal transmission / reception are provided in the camera body and the main microcomputer and at least one accessory unit. Since it is performed by the sub-microcomputer provided in and the transmission line is commonly used via the contact member, there is an effect that versatility with respect to expansion and reduction of the attached unit is significantly improved.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a focusing device for a camera according to a first embodiment of the present invention.

FIG. 2 is a signal waveform diagram provided for explaining the operation of the focusing device of the camera of the first embodiment.

FIG. 3 is a cross-sectional view of essential parts showing a unit combined state of the camera of the first embodiment.

FIG. 4 is an electric circuit diagram on the camera side of a focusing device for a camera according to a second embodiment of the present invention.

FIG. 5 is an electric circuit diagram on an interchangeable lens side of a focusing device for a camera according to a second embodiment of the present invention.

FIG. 6 is a signal waveform diagram for explaining the operation of the focusing device for a camera according to the second embodiment.

[Explanation of symbols]

1, 100 ………… Camera body 20, 200 ………… Electric drive unit (accessory unit) 40, 300 ………… Power supply unit (accessory unit) 400 …………… Strobe unit (accessory unit) ) 500 lens unit (attached unit) 5, 101 ... main CPU (main microcomputer) 25, 44, 201, 301, 401, 501 ... sub CPU (secondary CPU) Microcomputer)

Claims (1)

[Claims] 1. A focus detecting means for detecting a defocus amount of the interchangeable lens based on a subject image received through the interchangeable lens, a main microcomputer for controlling the camera system, in the camera body. A transmitting unit that transmits data indicating the defocus amount is provided, a driving unit that drives the focus lens in the interchangeable lens, a receiving unit that receives the data transmitted by the transmitting unit, and a receiving unit that receives the data. A sub-microcomputer for calculating the driving amount of the driving means based on the data received by the driving means, and a control for controlling the driving means based on the driving amount calculated by the sub-microcomputer A focusing device for a camera, comprising: