JPH0687110B2 - Camera bracket shooting setting device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera accessory that is detachably attached to a camera body, and more particularly to a camera accessory that is useful when performing continuous shooting while shifting an exposure correction amount.

Conventional technology Various attempts have been made to obtain proper exposure for various subjects (eg spot photometry, multi-segment photometry, etc.), but at present, a method that is 100% satisfactory for all subjects is available. Not not. Further, which part of the subject is properly exposed is subjective and changes depending on the photographer's intention of drawing. Therefore, when shooting a subject with a complicated brightness distribution, first shoot up to the exposure value obtained with the exposure meter, and then perform shooting multiple times with the exposure correction amount slightly different from that exposure value. A method (bracket shooting) of selecting a photo according to the intention of drawing is usually performed.

You can set any number of these exposure compensation amounts, and each time you shoot, send the set exposure compensation amount from the camera accessory to the camera body so that the camera body can shoot with the exposure value according to the exposure compensation amount. System is JP-A-54-
Proposed in 139732. According to this system, it is convenient because the photographing with the shift of the exposure correction amount can be automatically performed.

Problems to be Solved However, in this device, the display related to bracket shooting is to turn on the display elements L1 to L9 provided in the camera accessory for the display when setting the shooting conditions, and turn off the light when shooting. It was not easy for people to understand.

It is an object of the present invention to provide a setting device capable of performing a display most understandable to a photographer when performing bracket photographing.

Means for Solving the Problems According to the present invention, the set number of shots is displayed when the number of shots to be continuously shot is manually set, the set correction pitch is displayed when the correction pitch is set, and the set number of shots is displayed during shooting. For each frame shot, the remaining number of shots and the exposure compensation amount for the next frame are displayed, and after the set number of shots is finished, the number of shots set again and the exposure compensation amount for the first shot frame are displayed. It is characterized by being configured.

Action When setting the conditions during bracket shooting, the conditions being set are displayed, and the following shooting conditions are always displayed during shooting, so a display that is easy for the photographer to understand can be obtained.

First Embodiment FIG. 1 is a block diagram showing the whole camera system to which the present invention is applied. The camera body is enclosed by the broken line (BD), and the terminals (T ₁ ) to (T ₉ ) are electrically connected to the camera body (BD).
(BCKC) connected via is a circuit that has a data imprinting function, an interval shooting function, and a calculation function for the exposure control of the camera body (BD). This circuit is provided on the back cover of the camera. This circuit (BCKC) is called a back circuit. The back cover of the camera provided with this back circuit (BCKC) is called back (BCK). This back (BCK) can be attached to and removed from the camera body (BD) in an exchangeable manner, and the camera body is equipped with a circuit that has only the data imprinting function and the interval shooting function. It is also possible to attach a back cover without a functional circuit instead of this back (BCK). The structure and function of this back (BCK) and back circuit (BCKC)
Will be described later.

The (MDR) connected to the switch (S ₄ ) of the camera body (BD) via the terminal (T ₁₀ ) is the motor drive device (hereinafter simply referred to as the motor drive), and the exposure control operation is completed. Switch (S ₄ ) turns ON, the motor
The motor in the drive (MDR) starts rotating, and the mechanical interlocking mechanism charges the film winding and exposure control mechanism. Then, when charging is completed and the switch (S ₄ ) turns off, the motor drive (MD
The rotation of the motor in R) stops. The motor drive (MDR) is attached to the bottom of the camera body via a connecting mechanism. When the motor drive is not attached, the exposure control mechanism is charged and the film is wound by a manual winding lever. The motor drive (MDR) may be provided inside the camera body (BD).

Camera body (BD) and the terminal (T _11), a data output circuit provided in the (T _12), circuit (LEC) that is connected with (T ₁₃₎ is an interchangeable lens. This circuit (LEC) is electrically connected by mounting an interchangeable lens on the camera body. Then, when the terminal (CSL) of the camera main body becomes “Low”, the operation state is set, and various data unique to the interchangeable lens are sequentially output in series based on the reading clock pulse from the camera main body (BD). This data includes data for confirming the mounting of the interchangeable lens, open aperture value data, maximum aperture value data, focal length data, characteristic data for automatic focus adjustment, and the like. Details and data of this circuit are described in, for example, JP-A-59-84228 and JP-A-59-140408.
Since it is described in the issue, it is omitted.

(MET) is an external exposure meter (hereinafter referred to as a meter). Camera body (BD) and the terminal (T _14), a receiver for receiving the infrared signal sent from (T _15), the circuit being connected in (T ₁₆₎ (REC), the meter (MET). The receiver (REC) and the terminal _{(T 17), (T 18} ), the circuit being connected to (T ₁₉₎ (FL) is a flash device. The receiver (REC) is attached to the hot shoe of the camera body (BD), and the flash device (FL) is attached to the hot shoe provided in the receiver (REC), resulting in the connection state shown in FIG. Become. The camera body (B
Only the receiver (REC) may be attached to the hot shoe of D), or only the flash unit (FL) may be attached. Further, a terminal group having the same function as the terminals (T ₁₄ ), (T ₁₅ ), and (T ₁₆ ) is provided on another part of the camera body (BD) other than the hot shoe (for example, the bottom of the camera), and flashes on the hot shoe. One of the device (FL) and the receiver (REC) may be directly attached, and the other part may be attached with the other of the flash device (FL) and the receiver (REC) via an adapter.

The meter (MET) can be used as an incident light type or reflected light type exposure meter, and can also measure stationary light and flash light. Then, the exposure control data is calculated based on the measured value, and this data is emitted as serial optical data by the infrared light projection means. Besides this,
The data to be ejected include data indicating whether or not the flash unit (FL) is caused to emit test light, and whether or not data for control is sent from the meter (MET). The infrared light data sent from the meter (MET) is read by the receiver (REC) and latched as an electrical signal.

Next, the functions of the flash unit (FL) and the receiver (REC) related to the signal lines (ST ₁ ), (ST ₂ ), and (ST ₃ ) will be described together with the functions of the camera body (BD). First, the signal line (ST ₁ ) is a line for transmitting the light emission start signal,
When the X contact (SX) in the camera body (BD) closes when the running of the front curtain (1C) is completed, the flash device (FL) starts emitting light. The receiver (REC) is a meter (MET)
When a test flash signal is received from the receiver (REC)
Pulls down this terminal (ST ₁ ) to "Low" to start the flash device. The signal line (ST ₂ ) is bidirectional serial data for data transmission from the camera body (BD) to the flash unit (FL) and for data transmission from the flash unit (FL) and receiver (REC) to the camera unit (BD). It's a bus. Further, it has a function of transmitting a signal from the flash device (FL) to the camera body (BD), which indicates that the X contact (SX) is closed and the flash device (FL) starts to emit light.

The signal line (ST ₃ ) is a mode for inputting data to the camera body (BD) from the flash unit (FL) and receiver (REC), and the flash unit (FL) from the camera unit (BD).
The line that outputs the data to the flash unit (FL) and the receiver (REC) from the camera body (BD) to the flash device (FL) with a pulse of different time width from the mode that outputs the data to the mode that the camera body (BD) starts the exposure control operation. is there. Furthermore, the function to transmit the synchronization clock pulse for data transfer from the camera body (BD) to the flash unit (FL) and the receiver (REC). Furthermore, the flash unit (FL) emission stop signal is sent to the camera unit (BD). ) Has the function of transmitting from the flash device (FL).

In the camera body (BD), when the microcomputer (hereinafter referred to as the microcomputer) (BMC) sets the line (CSF) to "Low", the interface circuit (IF) becomes ready to exchange data. Then, when the camera body (BD) inputs data, when the microcomputer (BMC) outputs a pulse of the first time width to the signal line (FMO), this pulse signal is sent via the signal line (ST ₃ ). Input to the flash unit (FL) and receiver (REC), and each becomes the data output mode. When a clock pulse for reading data is output from the terminal (SCK) of the microcomputer (BMC), it is output to the signal line (ST ₃ ) via the interface circuit (IF).

Then, the flash device (FL) first outputs 1-byte data to the signal line (ST ₂ ), and this data is read from the data input terminal (SIN) of the microcomputer (BMC) via the interface circuit (IF). . This data is
There are a signal indicating whether the flash device is dedicated to this system, a signal indicating whether the charging voltage of the main capacitor exceeds a predetermined value, a signal indicating whether the flash device is automatically dimmed or the like. The second, third, and fourth bytes are output from the receiver (REC), and this data is also the data input terminal (S) of the microcomputer (BMC).
IN). The data in the second byte is a signal indicating whether or not the exposure control data is sent from the meter (MET), a test light emission signal, and the like. The 3rd byte is the exposure time data from the meter (MET) and the 4th byte is the aperture value data. When the above data input is completed, the signal line (CSF) becomes "High", and the data exchange with the flash unit (FL) and the receiver (REC) is not performed.

When transmitting data from the camera body (BD) to the flash device (FL), the signal line (CSF) is set to “Low” and the pulse of the second time width is output to the signal line (FMO).
Then, the flash unit (FL) enters the data input mode, and the data from the data output terminal (SOU) of the microcomputer (BMC) is changed based on the synchronization clock pulse from the camera body (BD).
Read bytes of data. This 3-byte data is 1
The second byte is the control aperture value (Av) and exposure control mode, the second byte is the data obtained by adding the film sensitivity and exposure correction data (Sv + Cv), and the third byte is the focal length of the interchangeable lens (f
v). The 1st and 2nd bytes of data are used to calculate and display the shooting distance range in which the proper exposure is compensated by the flash emission, and the 3rd byte of data is the interchangeable lens of the flash unit (FL). It becomes the data for adapting to the shooting angle of view of.

When the camera body (BD) starts the exposure control operation, the signal line (CSF) is set to “Low” and the pulse of the third time width is output to the signal line (FMO). Then, this pulse is read from the signal line (ST ₃ ) by the flash device (FL), and the flash device (FL) enters the light emission mode for exposure control. Then, when the actual exposure control operation starts,
A “Low” pulse is output to the signal line (RL), and the interface circuit (IF) sends the data from the signal line (ST ₂ ) to the flash emission control circuit (FLM) via the signal line (FST). Apply the circuit (FLM) to the line (FS
The signal input via P) is output to the signal line (ST ₃ ). The signal line (ST ₂ ) is connected to the flash unit (F
The signal of "Low" is output until the light emission of L) starts, and changes to "High" when the light emission of the flash unit (FL) starts. The light emission control circuit (FLM) is equipped with a light receiving element that receives the subject light that has passed through the shooting optical system and reflected from the film surface, and the signal lines (ST ₂ ) and (FST) are "Hi".
When gh "changes to" Low ", the integration of the output current of this light receiving element starts. And the integrated value is the film sensitivity (Sv) input from the AD, DA conversion circuit (ADA). When the value corresponding to the analog signal of the data Sv + Cv by the exposure correction amount (Cv) is reached, a “High” pulse is output to the signal line (FSP), which pulse is sent via the signal line (ST ₃ ) to the flash unit (FL). ) To stop flash firing.

Further, when a pulse is input from the signal line (ST ₃ ) for data transmission / reception, the flash device (FL) can perform a boosting operation for a fixed time (for example, 15 minutes) from the time when the pulse is input. Therefore, every time data is exchanged with the camera body (BD), the boosting operation is performed for a certain period from that point. When using this function to perform interval shooting with flash shooting, a signal to activate the camera body (BD) should be input from the back circuit (BCKC) a certain time (for example, 1 minute) before the start of shooting. When the camera body (BD) is activated, data is exchanged with the flash unit (FL), and the boosting operation is performed. Therefore, even with interval shooting with flash shooting that has an interval of 15 minutes or more, the flash device (F
The main capacitor of L) is in the charging completed state.

Specific examples of the above meter (MET), receiver (REC), flash unit (FL), interface circuit (IF), and flash emission control circuit (FLM) are, for example, Japanese Patent Application No. 59-2.
Since it is described in No. 01381, it is omitted. Specific examples of the flash device (FL), interface circuit (IF), and flash emission control circuit (FLM) are not limited to the above-mentioned Japanese Patent Application No.
-231520 and Japanese Patent Application No. 59-48435.

Next, the inside of the camera body (BD) surrounded by a broken line will be described.
(BMC) is a microcomputer, and its operation is shown in the flow charts of FIGS. (BA) is a power supply battery, and a circuit excluding the photometry circuits (FLM), (AM), and A-D / D-A conversion circuit (ADA) directly from this battery (BA) through the power supply line (+ E). Is powered. Transistor (B
T) is controlled by the signal from the output port (OP ₀ ) of the microcomputer (BMC) to "ON" and "OFF", and the transistor (BT) is "ON".
Then, through the power line (+ V), the photometric circuit (FLM),
(AMM), AD / DA conversion circuit (ADA), lens circuit (L
EC) is supplied. (DSP) is a display circuit that displays a metering mode, an exposure control mode, a control exposure time, a control aperture value, a film sensitivity, an exposure correction amount, and a flash device state. Further, when the exposure time and the aperture value are out of control interlocking, the control limit exposure time and the aperture value blink to display a warning. This display circuit (DSP)
When the signal line (CSD) is "Low", the data output terminal (SOU) to the terminal (SC
The serial data sent in synchronization with the clock pulse from K) is read and the display based on this data is performed.

(AMM) is a photometering circuit for ambient light, which has a light receiving element for partial light metering and average light metering, which can be switched by "High" or "Low" from the signal line (ASMO). Then, the photometric circuit (AMM) outputs a voltage signal obtained by logarithmically compressing the output current of the light receiving element. The AD, DA conversion circuit (ADA) outputs the output of the photometric circuit (AMM) to the clock from the terminal (CKOUT) of the microcomputer (BMC) when a "Low" pulse is output to the signal line (ADSTA). A-D conversion is performed based on the pulse. Also,
When the signal line (SCA) is "Low" and (ADMO) is "High", A- is synchronized with the clock pulse from the pin (SCK).
Send the D-converted data to the data input terminal (SIN) of the microcomputer (BMC), and the signal line (CSA) is "Low" (ADMO)
Is "Low", the data Sv + Cv is read from the output terminal (SOU), the data is DA converted, and the converted data is output to the light emission amount control circuit (FLM). When the signal line (CSA) is "High", data is not exchanged with the microcomputer (BMC). (G ₁ ) is a gate circuit, which becomes active when the signal line (CSL) becomes “Low”, enabling data transfer from the lens circuit (LEC) to the microcomputer (BMC). (AFC) is a circuit for automatic focus adjustment. When the signal line (AFEN) becomes "Low", it becomes the operating state and "Hi
gh ", the operation stops. In addition, the signal line (CSA
When F) is "Low", the automatic focus adjustment data from the microcomputer (BMC) is read. Since a concrete example of the automatic focus adjustment circuit (AFC) is shown in, for example, Japanese Patent Laid-Open No. 59-140408, its details are omitted.

(APG) is a means to output a pulse corresponding to the movement of the diaphragm narrowing member, and this pulse is a microcomputer (BMC)
Input to the terminal (CKIN) of. The pulse input to this terminal (CKIN) is input to the event counter in the microcomputer (BMC) and subtracted based on this pulse from the preset data of the number of narrowing stages. And
When the content of the counter becomes "0", it means that the scheduled narrowing has been narrowed down by the number of stages, and the counter interrupt occurs, and the narrowing stop pulse is output from the output port (OP ₁₂ ) and the narrowing operation stops.

(MGD) is a magnet circuit, and "Lo" is added to the signal line (RL).
When the "w" pulse is output, the release magnet operates, and the aperture and mirror-up operations start. When the "Low" pulse is output to the signal line (AP), the aperture magnet operates, and the aperture operation starts. Stop When the "Low" pulse is output to the signal line (1C), the front curtain lock release magnet operates and the front curtain starts running.The "Low" pulse is output to the signal line (2C). Then, the trailing-curtain unlocking magnet operates and the trailing-curtain starts to run. (G ₂ ) is a gate circuit, which becomes active state when the signal line (CSB) becomes “Low”, and the back circuit (BCKC) and the microcomputer. Data can be exchanged with (BMC) The signal line (CSB) has a function to activate the back circuit (BCKC), and the camera body (BD)
When the is in the operating state and tries to exchange data with the back circuit (BCKC), the back circuit (BCKC) is also activated. Furthermore, the signal line (CSB) is connected to the back circuit (BCK
When data is imprinted in C), a "Low" pulse is output when the trailing curtain starts running to prevent film winding. When this pulse is input, the back circuit (BCKC) stops the imprinting operation for the time corresponding to the film sensitivity data sent from the camera body (BD). Signal line (BI
O) sends data from the camera body (BD) to the back circuit (BCKC) when it is "High", and sends data from the back circuit (BCKC) to the camera body (BD) when it is "Low". A pulse for imprinting data is output to the signal line (IP). This pulse is output from the time when the exposure control operation starts, and has a time width corresponding to the film sensitivity.

The switch (S ₁ ) is a photometric switch that is closed in the first step of pressing down the release button, and starts the photometric calculation operation. Also, in parallel with this switch (S ₁ ), the back circuit (BC
The signal line (BS ₁ ) is input from KC), and the microcomputer (BMC) can be started from the back circuit (BCKC). From the back circuit (BCKC) to the signal line (B
The start signal is input via S ₁ ) to the back circuit (BC
KC) is operated and the back circuit (BCKC) operates, and as described above, the camera body is set to start boosting the flash unit (FL) 1 minute before starting the shooting operation in interval shooting. There are two types of activation.
The switch (S ₂ ) is a release switch that is closed in the second step of pressing down the release button. When this switch (S ₂ ) is closed, the exposure control operation is activated. In addition, the signal line (BS ₂ ) is connected in parallel from the back circuit (BCKC) in parallel with this switch (S ₂ ), and the back circuit (BCKC)
To transmit the signal to start the shooting operation to the camera body (BD) when shooting a predetermined number of shots (hereinafter referred to as bracket shooting) that have been shifted by a fixed exposure value relative to the proper exposure. It has become. Further, when a predetermined number of frames (hereinafter referred to as the number of frames) have been shot during bracket shooting, the shift to the exposure control operation is switched to the back circuit even if the release switch (S ₂ ) of the camera body (BD) is “ON” It is prohibited from the (BCKC) side, and when the release switch (S ₂ ) of the camera body (BD) is set to “OFF”, it is possible to shift to the next bracket shooting. Therefore, the back circuit (BCKC) looks at the state of the release switch (S ₂ ) of the camera body (BD), and the release switch (S ₂ ) turns “ON” after shooting for the set number of frames by bracket shooting. If so, the data that prohibits the transition to the exposure control operation is transferred to the back circuit (BCK
It is designed to be sent from C) to the camera body (BD). In the interval shooting, the back circuit (BCKC) determines the shooting start time, the number of frames, and how many times (in the following, the number of groups) shooting is performed by this number of frames. Can be set. And the back circuit (BC
From KC), at the start time, the exposure control operation is performed by outputting a “Low” signal to the signal line (BS ₂ ) until shooting for the number of frames is performed. Then, when the photographing of one group is completed, the signal line (BS ₂ ) is set to “High”, the time count for the set time interval is performed, and the remaining time is displayed. Then, when the remaining time reaches 0 seconds, the signal line (BS ₂ ) is set to “Low” again, and photographing for the number of frames is performed. When the above operation is completed, the set interval shooting mode is released. Even if the back circuit (BCKC) is operating in the interval shooting mode, the set start time and time interval are ignored if the release switch (S ₂ ) of the camera body (BD) is closed. Then, the photographing operation is performed. That is, even if the start time has not been reached, when the release switch (S ₂ ) turns “ON” and the shooting operation starts, the back circuit (BCKC) keeps the signal line (BS ₂ ) until shooting for the number of frames. “Low”
I have to. The same operation is performed when the release switch (S ₂ ) is closed before the set time interval elapses. The number of shooting operations performed by the camera body (BD) is determined by counting the number of input pulses for imprinting data from the signal line (IP).

The switch (SMO) of the camera body (BD) is a switch for switching the exposure control mode. The mode changes each time this switch (SMO) changes from "OFF" to "ON". The exposure control modes of the camera are a program automatic exposure control mode (P mode), an exposure time priority aperture automatic exposure control mode (S mode), an aperture priority exposure time automatic exposure control mode (A mode), and a manual exposure control mode (M mode). There is. The respective modes change in the order of P → A → M → S → P .... The switch (SIS) is a switch for setting the film sensitivity, and every time this switch (SIS) changes from “OFF” to “ON”, the film sensitivity changes in steps of 1/3 Ev and reaches the upper limit value. After that, when the switch (SIS) changes from “OFF” to “ON”, it changes to the lower limit value and “OF” again.
It increases again when the switch changes from "F" to "ON". (SOR) is a switch for setting the exposure compensation amount, and it is 0 when the switch (SOR) changes from "OFF" to "ON".
→ 1/2 → 1 → 11/2 → 2 → 21/2 → 3 → 31/2 → 4 → -4 → -3
It changes in the order of 1/2 → -3 → -21 / 2 → -2 → -11 / 2 → -1 → 1/2 → 0. (ST) is a switch to set the exposure time, and every time it changes, it changes to the shorter exposure time side in 1Ev steps. And in S mode, 32sec → 16sec → 8s
ec → …… → 1 / 1000sec → 1 / 2000sec → 1 / 4000sec → 32sec →
...... It changes like 32sec → 1 in M mode
6sec → …… → 1 / 2000sec → 1 / 4000sec → valve → 32sec →
… And so on. Therefore, in the M mode, the valve mode can be set by operating the switch (ST). The switch (SA) is a switch for setting the aperture value. When this switch (SA) changes from "OFF" to "ON", when the mode is A or M mode, the maximum aperture value is changed from the maximum aperture value in 1 / 2Ev step. Change towards value. Then, when the maximum aperture value is reached, the aperture value is changed to the maximum aperture value. The switches (SMO), (SIS), (SOR), (ST), and (SA) are switches that are closed by operating the operation keys provided outside the camera. Also, switch (S ₁ ),
(S ₂ ), (SMO), (SIS), (SOR), (ST), (SA)
Are connected to the interrupt terminal (INT) of the microcomputer (BMC) via the AND circuit (AN) respectively. Therefore, when the data setting key provided outside the camera is operated, the release button is operated. Back circuit (BC
When the "Low" signal is input from the KC) via the signal lines (BS ₁ ) and (BS ₂ ), if the microcomputer (BMC) is in the operation stopped state, the microcomputer (BMC) will accept this interrupt signal. Start operation. The switch (SCN) is a switch linked to a mechanical film counter. This switch (SC
N) is “ON” until the film counter reaches the position where the number of frames is “1”, and “OFF” from the position of “1”.
become. The signal from this switch (SCN) is the microcomputer (B
It is input to the back circuit (BCKC) via the input port (IP ₇ ) of MC) and the terminal (T ₉ ). The microcomputer (BMC) controls the exposure with the shortest exposure time and the maximum aperture value while the switch (SCN) is "ON". On the other hand, the back circuit (BCKC) does not perform the data imprinting operation even when the pulse signal is input from the signal line (IP) while the switch (SCN) is "ON". In addition, the back circuit (BCKC) has the function of adding or subtracting "1" from the set value for each pulse from the signal line (IP) that is input each time shooting is performed, and this data is copied. While (SCN) is "ON", neither addition nor subtraction operation is performed. If the pulse is not output to the signal line (IP) while the switch (SCN) is "ON", the back circuit (BCKC) looks at the state of the switch (SCN) and imprints the data. It is not necessary to determine whether or not to perform addition / subtraction, and the terminal (T ₉ ) is also unnecessary. Also, instead of a mechanical film counter, an electric film counter is used, and until the film reaches the regular shooting frame position (the counter display is "1"),
A “Low” signal may be output to the terminal (T ₉ ), or a pulse may not be output to the signal line (IP).

The switch (SAS) is a switch that turns “ON” and “OFF” in conjunction with the photometric mode switching member attached to the external appearance of the camera. This signal is input to the input port (I) of the microcomputer (BMC).
Have entered into P _6), the microcomputer (BMC) is a signal line from the if signal "Low" is input output port (OP ₇₎ (A
SMO) outputs a "Low" signal to set the partial metering mode and causes the display (DSP) to display the partial metering mode. On the other hand, if a “High” signal is input to the input port (IP ₈ ), the “High” signal is output to the signal line (ASMO) to set the average metering mode, and the display section (DSP) is averaged. Send data to display the mode. Switch (S ₄ )
Is "ON" when the exposure control mechanism finishes the exposure control operation, and "OFF" when the shutter charge operation of the exposure control mechanism is finished.
The signal from this switch (S ₄ ) is input to the input port (IP ₉ ) of the microcomputer (BMC). Microcomputer (BMC) does not migrate even exposure control operation by the release switch (S ₂₎ is "ON" if the input signal of "Low" from the switch (S _4).

The microcomputer (BMC) outputs the pulse of the time width corresponding to the film sensitivity to the signal line (IP), but the back circuit (BCKC) shown in Fig. 1 is from the camera body (BD). The time corresponding to the read film sensitivity is made in the back circuit (BCKC), and the data is imprinted only for this time width. Therefore, the pulse from the signal line (IP) is used only for the signal to start the imprinting operation. However, it does not have a function to read the film sensitivity data from the camera body and make a time corresponding to this data, and it has a data imprinting unit that imprints data while pulses are being input from the signal line (IP). The back cover camera body (BD) equipped with it may be attached, so the microcomputer (BMC) has such a function. The back circuit (BCKC) has a function to capture the exposure time and aperture value for exposure control sent from the camera body. Therefore, before the microcomputer (BMC) enters the exposure control flow and outputs a pulse to the signal line (IP), the exposure time and aperture value must be set in the back circuit (BCKC).
I am sending it to. Therefore, the back circuit (BCKC) uses the exposure for control from the camera body (BD) in order to reduce the probability that the trailing curtain starts running and the data imprinting is stopped before reaching the proper time. The imprinting operation is started when the operation of sending the time and the aperture value is detected.

The operation of the camera system shown in FIG. 1 will be described below with reference to the flowcharts shown in FIGS. Switch (S ₁ ),
Either (S ₂ ) (SMO), (SIS), (SOR), (ST), (SA) becomes “ON”, or the back circuit (BCKC)
When a "Low" signal is input from the signal lines (BS ₁ ) and (BS ₂ ) of, the output of the AND circuit (AN) becomes "Low" and the interrupt terminal (INT) of the microcomputer (BMC) becomes "Low". Fall to.
Then, the microcomputer (BMC), which has stopped operating, starts operating from step # 0. First, in the step of # 0, a "Low" pulse is output to the signal line (CSB),
Activate the back circuit (BCKC), and in step # 1,
Turn on the transistor (BT) to turn on the photometric circuit (FLM),
(AMM), AD, DA conversion circuit (ADA), lens circuit (L
Power supply to EC) is started. Then, in the step of # 2, whether or not the "Low" signal is input to the input port (IP ₁ ), that is, whether the switch (S ₂ ) is "ON" or the signal line of the back circuit (BCKC) ( Determine whether the release signal is input from BS ₂ ). And the input port (IP
_{If a} "Low" signal is input to ₁ ), proceed to step # 3. In step # 3, the switch (S ₄ ) turns “OF”.
If it is "F", it is judged whether the exposure control mechanism is fully charged. If it is not "OFF", the exposure control operation cannot be started, so the process proceeds to step # 10. On the other hand, the switch (S ₄ ) If it is "OFF", it is then determined in step # 4 whether the flag RLEF is "1".
RLEF is set to "1" unless the release control signal is input from the back circuit (BCKC) when the data (Tv, Av) for exposure control is ready. It is reset to "0" when the release prohibition signal (input at the end of bracket shooting) is input from the circuit (BCKC). If the flag RLEF is "1" in the step of # 4, the flow moves to the exposure control operation starting from the step of # 110, and if the flag RLEF is "0", the step moves to # 10. Also, in step # 2, input port (IP ₁ )
If a "Low" signal is not input to, move to step # 10.

In step # 10, it is determined whether a "Low" signal is input to the input port (IP ₀ ), and if so, set flag S ₁ F to "1". S ₁ F is “0”
Then, proceed to step # 12. This is a preparatory operation for determining whether "Low" is input to the input port (IP ₀ ) by the switch (S ₁ ) or the back circuit (BCKC). Next, in step # 12, one of the partial and average light receiving elements in the photometric circuit (AMM) is selected according to the state of the switch (SAS), and the process proceeds to step # 13. In step # 13, set the signal line (CSL) to “Lo
w "and repeat the serial input / output operation multiple times to read various data from the lens circuit (LEC).
In the step of, from the clock output terminal (CKOUT) to A-
Output of D conversion clock is started, and signal line (ADST
A pulse of "Low" is output to A) to start the operation of AD converting the output of the photometric circuit (AMM) by the AD, DA conversion circuit (ADA).

Next, in step # 20, it is determined whether or not the flag S ₁ F is set to “1” in step # 11. If it is set, the process proceeds to step # 21. If it is not set #
Go to 24 steps. Flag S ₁ F not set means that switch (S ₁ ), buck circuit (BCKC)
It means that it is not the operation by the signal line (BS ₁ ) of
In this case, in order to prohibit the photographing lens by automatic focusing operation is inadvertently moved, the flag S ₁ F in steps of # 25 to a signal line (AFEN) to "High" to "0" Reset (it is already reset to "0" in this case) and proceed to step # 26. On the other hand, if the flag S ₁ F is “1” in step # 20, then it is determined in step # 21 whether the input port (IP ₀ ) is still “Low”. This is because the back circuit (BCKC) starts the boosting operation of the flash device 1 minute before the interval shooting, or when the back circuit (BCKC) starts the operation for exposure calculation, the camera body (BD) is To activate it, it outputs a "Low" pulse to the signal line (BS ₁ ). By the way, it is not desirable that the lens is inadvertently moved by performing the automatic focus adjustment operation when the camera body (BD) is activated by the back circuit (BCKC). Therefore, when the back circuit (BCKC) activates the camera body (BD), the time from the time the interrupt signal is input to the microcomputer (BMC) to the step # 21 is shorter than the time to the step # 21. "Low" with a width longer than
Pulse is output to the signal line (BS ₁ ), and the signal line (BS ₁ ) is “High” at the time of determining whether the input port (IP ₀ ) is “Low” in step # 21.
Has become. Therefore, in this case, the signal line (AFEN) is set to "High" in the step of # 24 so that the automatic focus adjustment operation cannot be performed, and the process proceeds to the step of # 26 after the step of # 25. On the other hand, if it is determined in step # 21 that the input port (IP ₀ ) is "Low", this means that the photometric switch (S ₁ ) is "ON". Set the line (AFEN) to "Low" to activate the automatic focus adjustment circuit (AFC), and set the signal line (CSA
F) to "Low" to send automatic focus adjustment data, and to return the signal line (CSAF) to "High", reset the flag S ₁ F to "0" in step # 25, and then set # 26. Go to step. In step # 26, the flash unit (F
L) and the data reading from the receiver (REC). This operation is performed by setting the signal line (CSF) to "L" as described above.
ow ", and outputs the pulse of the first time width to the signal line (FMO). And the serial input / output operation is performed. First, the above-mentioned first byte data from the flash unit (FL), and then the receiver (REC ), The data is output in the order of the second, third, and fourth bytes of the above-mentioned data read from the meter (MET), and this data is read, and the signal line (CSF) is set to “High”. The operation of step # 26 ends.

Next, in step # 30, it is determined whether or not the film sensitivity setting switch (SIS) has changed from "OFF" to "ON".
Increase by 1/3 Ev and move to step # 32. on the other hand,
If it is not determined that there is a change, the process immediately moves to step # 32, and the exposure compensation amount setting switch (ORS) is "OFF".
To determine whether it has changed from "ON" to "ON". When a change is detected, the exposure correction amount is increased by 1/2 Ev in step # 33 and the process proceeds to step # 34. When no change is detected, the process directly proceeds to step # 34.

In the step of # 34, it is determined whether or not the switch (SCN) is "ON", and if it is "OFF", the process proceeds to the step of # 40. On the other hand, if the switch (SCN) is "ON", it means that the film counter is not in the display state of the number of regular frames ("1") (S ...). At this time, the process proceeds to step # 35. . In step # 35, the shortest exposure time (Tvmax) and the maximum aperture value (Avmax) corresponding to the minimum aperture are set for control, and the flag RLEF is set to "1" in step # 108. Move to. Even if the control data from the back circuit (BCKC) or meter (MET) is read from the receiver (REC) until the number of regular frames is reached, the camera body ignores this data and performs exposure control with Tvmax, Avmax. It will be. In this case, the exposure calculation is not performed in the camera body (BD), and the settings other than the data of the film sensitivity and the exposure correction amount cannot be accepted. Moreover, even if the data for prohibiting the exposure control operation is input from the back circuit (BCKC), it is ignored.

In step # 40, it is determined whether the flag BCKF is "1". For this flag BCKF, the back circuit (BCKC) calculates the exposure control data, sends this data to the camera body (BD), and the camera body (BD) controls the exposure based on this data. Data (hereinafter back ICP
Is set to "1" when it is read, and it is reset to "0" otherwise. Therefore, since it is always reset to "0" at the first operation, # 41
Go to step. On the other hand, when the exposure control is performed based on the data from the back (BCKF = 1) # 43
Immediately #
Move to step 51. Therefore, the switch (SMO),
The data is not changed even if (ST) or (SA) is operated.

In step # 41, it is determined whether or not the mode switch (SMO) is changed from "OFF" to "ON", and when the change is determined, the exposure control mode is changed. On the other hand, switch (SM
If O) remains “OFF” or remains “ON”, the exposure control mode remains the same and the process proceeds to step # 43. # 43
In the step, it is determined whether or not the mode is the S, M mode. Since the S, M mode accepts the change of the exposure time, the process proceeds to step # 44. On the other hand, if the mode is not the S or M mode, the process immediately proceeds to step # 46. In step # 44, it is determined whether or not the switch (ST) has changed from “OFF” to “ON”, and when the change is detected, the exposure time is increased by 1 Ev. On the other hand, if no change in the switch (ST) is detected, the process immediately proceeds to step # 46. As mentioned above, after the shortest exposure time (1/4000 sec), switch (S
When T) changes from "OFF" to "ON", it changes to the longest exposure time (32 sec) in S mode, and changes to a valve in M mode. In step # 46, it is determined whether the mode is A or M. If the mode is not A or M, the aperture value setting cannot be accepted, so proceed to step # 50 as it is. Determine the change of the switch (SA) with. Then, if there is no change, the process directly proceeds to the step # 50, and if the change from "OFF" to "ON" is discriminated, the aperture value is increased by 1 / 2Ev and the process proceeds to the next step # 50. . In addition, the detection of the change of the switches of # 30, # 32, # 41, # 44, and # 47 from "OFF" to "ON" is stored in each step. It can be detected by comparing the state of the switch at the time of the step with the signal storing the previous state.

In step # 50, the signal line (CSA) is set to "Low", then serial input / output operation is performed to read the A / D converted data in series, and the signal line (CSA) is set to "High".
Then, the clock output from the clock output terminal (CKOUT) is stopped and the process proceeds to step # 51. And # 51
In the step of # 1, it is determined whether the flag BCKF is “1” and if it is “1”, # 55 is passed without passing through the operation steps of # 52, 53, 54.
Go to step. On the other hand, if the flag BCKF is "0", the process proceeds to step # 52, and it is determined whether the charging completion signal is input from the flash device (FL). If the charge completion signal is input, the exposure calculation for flash photography is performed in step # 53, and if the charge completion signal is not input, the exposure calculation for constant light photography is performed.
When the above operation is completed, the microcomputer (BNC) returns to # 55.
Move to the operation of step. Specific examples of the operations of # 53 and 54 are, for example, JP-A-59-111132 and JP-A-59-140408.
No.

In step # 55, the signal line (CSB) is set to “Low”, the signal line (BIO) remains “High”, and data is transferred to the back circuit (BCKC). The following data is sent from the camera body (BD). First, the first byte is the data sent from the flash device, the second byte, the third byte, and the fourth byte are the data from the meter (MET) read from the lace bar (REC). When it is determined that the exposure control data from the meter (MET) has been input, the back circuit (BCKC) performs display based on this data and sends this data back to the camera body (BD) as control data. This function is called an external function. What kind of exposure is this external function if the function that performs the exposure calculation by the back circuit (BCKC) (hereinafter called the exposure function) is active when the exposure control data from the meter (MET) is input? Mode (3 types of P mode, S, A,
M mode and manual long time (M / LT) mode)
Even if is selected, it becomes an external function and controls the exposure based on the data from the meter (MET).
Further, when the exposure function is in the active state, a function that stores a plurality of photometric values from the camera can be activated (hereinafter referred to as a multi-function). In this function, the average value of multiple stored photometric values Mode (average mode), mode that calculates the intermediate value ((Bvmax + Bvmin) / 2) between the maximum and minimum stored photometric values (hereinafter center mode), and the value that reproduces the maximum value at the upper limit of film latitude (Bvmax There is a mode (highlight mode) for obtaining −2.3) and a mode (shadow mode) for obtaining a value (Bvmin + 2.7) that reproduces the minimum value at the lower limit of latitude. Even if such a multifunction is active, if the exposure control data is input from the meter (MET), it becomes an external function and the multifunction becomes invalid. Further, when the exposure function is in the active state, the function for performing bracket shooting (bracket function) may also be in the active state. At this time, if it is determined that the exposure control data from the meter (MET) has been input, bracket shooting is performed based on the exposure control data from the meter (MET).

5 sent from the camera body (BD) to the back circuit (BCKC)
Open read from; (open aperture value Av _0), 6 byte lenses circuit (LEC) byte of data photometric data read from the A-D · D-A conversion circuit _{(ADA) (Bv-Av 0} ) Aperture value data (Av ₀ ), the 7th byte is maximum aperture value data (Avmax). Furthermore, the 8th byte is the shortest exposure time data (Tvmax), and the 9th byte is the longest exposure time data (Tvm).
in), the 10th byte is the flash exposure sync limit exposure time data (Tvx), the 11th byte is the exposure time data (Tv) obtained by the camera body (BD), and the 12th byte is the aperture value data obtained by the camera body. (Av). Furthermore, the 13th byte is the film sensitivity (Sv), and the 14th byte is the exposure compensation amount (Cv). When the above data transfer is completed, the microcomputer (BMC) of the camera body (BD) moves to step # 56 and sets the signal line (BIO) to "Low". Then, 1 byte of data is sent from the back circuit (BCKC). This data is the back ICP described above. Back circuit (BCK
If the exposure function is selected in C), for example, “8
0H "(H indicates hexadecimal number) data is sent, and if the exposure function is not selected, the back circuit (BCKC) does not output this data and the camera body (BD) outputs" 00H ".
To read. When the reading of the back ICP data is completed, the microcomputer (BMC) sets the signal lines (CSB) and (BIO) to “High” and shifts to step # 57.

In step # 57, it is determined whether the back ICP is "80H", and if it is not "80H", the back cover without the back circuit (BCKC) is attached or the back circuit (BCKC).
When the exposure function is not selected in
At this time, the calculation or meter (MET) in the camera body
In order to perform the operation based on the data from, the flag BCKF is reset to "0" in step # 58, and the process proceeds to step # 90. If it is determined in step # 57 that the back ICP is "80H", it means that the exposure function is selected, and the process shifts to step # 60 to set the flag BCKF to "1". And the back circuit (BCK
In step # 61, wait for the back circuit (BCKC) to calculate the exposure control data based on the data sent to C). During this time, the back circuit first calculates the photometric value based on the sent data. During this period, the signal line (CSB) remains "Low". This means that (Bv-A
v ₀ ) + Av ₀ = Bv is only calculated, but when multifunction is selected, it depends on the mode selected from the above-mentioned average mode, center mode, highlight mode, and shadow mode. Calculate. In the case of multi-function, unless the memory operation (pressing the memory key) is performed, every time the photometric data from the camera body (BD) is updated, the exposure calculation based on that data is performed. After that, the control data is calculated based on the stored photometric data, and the data from the camera body (BD) is only displayed. Then, the exposure data is calculated according to the photometric data thus obtained and the set exposure mode to calculate the control data. This operation is
As the program mode, Bv + Sv = Ev is the first program (P ₁ ) mode (Principally Av = 2/3 · Ev = 1/3 ・ E
v), the second program (P ₂ ) mode with an inclination of 1/2 (Av = 1 /
2 ・ Ev, Tv = 1/2 ・ Ev), 3rd program with slope 2/3 (P
₃ ) There are three types of modes (Av = 1/3 ・ Ev, Tv = 2/3 ・ Ev). The S mode was set by the back circuit (BCKC).
Ev−Tv = Av is calculated from Tv, A mode is set to Ev−−Av = Tv from set Av, and M mode is set.
Calculate Av and Tv as control values. Note that the calculated Av is A
If v> Avmax, EV−Avmax = Tv; if Av <Av ₀ , EV−
Av ₀ = Tv is calculated and Tv and Av ₀ or Tv and Av ₀ are used as calculated values. Similarly, when Tv <Tvmin, Tvmin and EV−
When Tvmin = Av and Tv> Tvmax, the calculated values are Tvmax and EV-Tvmax = Av. Also, in the P ₁ , P ₂ , P ₃ mode, Av ₀
<Limiting the aperture in Av _1, Av ₂ <Av ₁ is manually set the Avmax, Av _2.

Also, in the M / LT mode, it is possible to set a longer exposure time than the maximum exposure time (Tvmin) that can be set on the camera body. When such a time is set, the data for the valve is sent to the camera body (BD), the camera body is set to the valve mode, and this time is counted by the back circuit (BCKC). During this time, the signal line (BS ₂ ) is set to “Lo
As w ", the trailing curtain is not run, and when the count ends (BS ₂ ) is set to" High "to run the trailing curtain. The display data of the camera body is for the valve display. Send the set time display data instead of the data If the multifunction is not selected, the exposure control diagram and the Ev value line for each mode will be set as the vertical axis for the aperture value and the horizontal axis for the exposure time. When the multifunction is selected, each stored value and the current value based on the exposure control value are displayed graphically.

When the bracket function is selected,
Using the calculated control value as a reference, a control value obtained by shifting the set deviation amount by the number of frames at that time is calculated. Note that the graphic display at this time displays the position of the current shooting in the form of a bar graph. The details of the display in the above exposure function will be described later.

Also, when it is determined that the charging completion signal is included in the data from the flash device input via the camera body, at this time, the back circuit does not perform the above-mentioned calculation display and the camera body (BD ) From Tv, Av is displayed and the data is used as control data. This is because the calculation for flash shooting (step # 53) on the camera body side has a considerable function as shown in, for example, Japanese Patent Laid-Open Nos. 59-140408 and 59-111132. This is because there is no need to perform calculations for flash photography on the back circuit (BCKC) side. In addition, for example, in order to correspond to the camera body that does not have the function for flash photography as described above, the back circuit side performs the same calculation as the step of # 53, and when the charging completion signal is input, it is exposed. If the function is selected, the flash function is automatically selected, and calculation may be performed according to the exposure mode set at that time and control data may be sent to the camera body. Further, it is possible to prepare an operation that combines a multi-function, a bracket function and a flash function, and send the operation result to the camera body (BD).

When enough time has passed to complete the above operation, the microcomputer (BMC) shifts to step # 62, sets the signal line (BIO) to "Low", and performs serial input / output operation. , Read the data from the back circuit (BCKC). The first byte of this data is the control exposure time data (valve in M / LT mode), the second byte is the control and display aperture value data, and the third byte is the display exposure time data (M / LT
Exposure time in mode), 4th byte is back exposure mode (P ₁ , P ₂ , P ₃ are P mode, M, M / LT mode is M mode, external function is meter side light mode), 1 , 2
The byte control data includes out-of-coupling data indicating that Ev is data limited to a limit value because Ev is out of control interlocking and data indicating whether to prohibit the exposure control operation (release prohibition data). When the 4-byte data is read, the microcomputer sets the signal lines (CSB) and (BIO) to "Hig".
In step # 63, the read Tv and Av are set as control data. Then, it is determined whether the release prohibition data is read, and if read, the flag RLEF is set to “1”. If not read, the flag RLEF is reset to "0" and the process proceeds to step # 70.

In step # 70, the exposure mode is displayed according to the read mode data (M mode in meter metering mode), and in step # 71, it is determined whether or not the non-interlocked data is read, and the data is read. If so, the warning is displayed, and if not read, the warning is not displayed and the process proceeds to step # 74. In step # 74, the meter metering mode is displayed on the camera body (BD), which is the average metering mode or the partial side light mode. In step # 75, the control exposure time and aperture value are displayed. When long exposure time data is sent from the back circuit (BCKC), valve data is sent for control, but this long data is sent for display. This data is displayed. Next, in step # 76, the film sensitivity and exposure compensation amount are displayed.
Based on the data sent from the flash unit (FL), it displays whether or not flash photography will be performed. next,
In step # 78, set the signal line (CSF) to "Low",
The pulse of the second time width is output to the signal line (FMO). When the flash unit (FL) reads this pulse, it becomes a state of reading the data from the camera body. In the microcomputer (BMC), the first byte is the control aperture value and the exposure control mode, the second byte is the data obtained by adding the film sensitivity and the exposure correction amount (Sv + Cv), and the third byte is the focal length data of the interchangeable lens ( fv). The method of using these data is as described above.

When the above operation is completed, the switches (S ₁ ), (S ₂ ), (SMO), (SIS), (SOR), (S
It is determined whether at least one of T) and (SA) is closed. If at least one is closed, the timer is reset and started in step # 80.
Then, the operation explained above is repeated. On the other hand, if all of the above switches are “OFF”, it is determined in step # 81 whether the count time (10 sec) of the timer started in step # 80 has ended. If not, the process returns to step # 2. Return. On the other hand, when all the above switches are turned "OFF" and 10 seconds have passed, the process proceeds to step # 85. Then, in step # 85, it is possible to interrupt the interrupt pin (INT), and the flags RLEF and BCK
F is reset to "0", the display is turned "OFF", the power supply transistor (BT) is turned "OFF", and the microcomputer (BMC) stops operating.

When it is determined in step # 57 that the back ICP is not "80H", the flag BCKF is reset to "0" in step # 58, and the process proceeds to step # 90 in FIG. In step # 90, the receiver (REC) reads the exposure control data from the meter (MET), and this data is read by the camera (B
Determine whether or not D) was read. When it is read, the process proceeds to step # 91, and when it is not read, the process proceeds to step # 100. In the step of # 91, the data from the read meter (MET) is limited within the range of the maximum aperture value and the maximum aperture value for the aperture value. Within the range, if shooting with flash, limit within the range of the synchronization limit and the longest exposure time. Then, the data from the meter (MET) based on the above is set as a control value, the exposure control mode is M mode, and the metering mode is the metering mode. On the other hand, when the data from the meter (MET) is not read in step # 90, the data calculated in step # 53 or # 54 is set as control data in step # 100. The setting of the control aperture value at # 63, 92, 100 corresponds to the setting of the number of aperture steps (Av-Av ₀ ). In the step of # 101, the exposure control mode of the camera body (BD) is displayed, the metering mode is further displayed, and the process proceeds to the step of # 105. When the control data is limited to the interlocking limit data, the warning display is set to "ON", and when not limited, the warning display is set to "OFF" and the flag RL is set.
Set EF to "1" and move to step # 75 in FIG.

In step # 2, if the input port (IP ₁ ) is "Low", the switch (S ₄ ) is "OFF", and the flag RLEF is "1", # in Fig. 3
The exposure control operation from step 110 is performed. First # 110
In the step, the signal line (AFEN) is set to "High" to stop the operation of the automatic focusing circuit (AFC), and then the release signal is transmitted to the flash unit (FL). This operation sets the signal line (CSF) to "Low" and the signal line (FMO)
The pulse of the third time width is output to the signal line (CSF)
Is made high again. When the flash unit (FL) determines that the pulse having the third time width is input, the flash mode is set to the light emission mode for photographing. Next, the signal line (CSB) is set to “Low”, and the control exposure time data and aperture value data are sent to the back circuit (BCKC). This data is used as data for imprinting in the back circuit (BCKC), and when this data is input, the back circuit starts the data imprinting operation when the imprinting function is selected. In the imprint function, as the imprint mode, control data mode,
Year / month / day mode, month / day / year mode, day / month / year mode, month / day / hour mode, day / hour / minute mode, hour / minute / second mode, count up mode, count down There are modes and fixed data modes. In the control data mode, the control data calculated by the back circuit (BCKC) (only when the exposure function is selected) or the camera body (BD)
The control data sent from step # 112 is copied. Year / month / day mode, month / day / year mode, day / month /
Year mode, day / month / hour mode, day / hour / minute mode, hour /
In the minute / second mode, each data from the calendar circuit of the back circuit (BCKC) is copied in the order of the mode name. In the count-up mode and count-down mode, the value obtained by adding or subtracting "1" to or from each preset is imprinted on the preset fixed value. Fixed data mode imprints preset values.

In step # 113, the microcomputer (BMC) next sets the signal lines (CSA) and (ADMO) to "Low", and adds the film sensitivity and exposure correction amount data (Sv + Cv) to the AD / DA conversion circuit. Send to (ADA). When the circuit (ADA) reads this data Sv + Cv, it performs DA conversion and outputs it to the flash emission control circuit (FLM). Next, set the film sensitivity to the timer to control the imprinting time, and set the signal line (IP) to "Low" in step # 115, and the back circuit (BCKC).
It is possible to determine the start of data imprinting as described above, and the imprinting operation of the data imprinting device having no imprinting time control function is started. Then, the interruption by the timer is enabled and the counting of the timer is started. Then, in step # 120, the counter interrupt is enabled, a "Low" pulse is output to the signal line (RL) to operate the release magnet, and the narrowing-down operation and the mirror-up operation are started. Then, in step # 122, wait for a sufficient time to complete the mirror-up operation. During this time, the pulse from the aperture pulse output circuit (APG) is input to the clock input terminal, and the aperture stage number data preset in the down counter is subtracted each time the pulse is input. When the content of the counter becomes "0", the counter is interrupted and the operation of step # 150 is performed. In this step, a "Low" pulse is output to the signal line (AP) to operate the diaphragm magnet and stop the diaphragm operation. Then, the timer interrupt is enabled and the process returns to the main routine. Also, the counter may not be interrupted when an interchangeable lens whose aperture control is not possible is attached, or when the interchangeable lens is not attached.
When a certain time elapses in step 122, the process proceeds to step # 123, where the counter interrupt is disabled and the process proceeds to step # 125.

In step # 125, it is determined whether the control exposure time data is a valve. If it is not a valve, the process proceeds to step # 126. In step # 126, a "Low" pulse is output to the signal line (1C) to operate the front curtain magnet to start the front curtain traveling. Next, the exposure time is counted, and when the count ends, the signal line (2C)
A "Low" pulse is output to, the rear curtain magnet is activated, the rear curtain starts running, and the process proceeds to step # 135.
If it is determined in step # 125 that the valve is a valve, the process proceeds to step # 130 and the leading curtain is run. Then, it waits for the input signal to the input port (IP ₁ ) to become "High". At this time, if the back circuit (BCKC) is not installed, wait for the release button to be released and the switch (S ₂ ) to be “OFF”. When the switch (S ₂ ) is “OFF”, the rear curtain Start running. On the other hand, back circuit (BCKC)
When is mounted and M / LT is selected, the back circuit (BCKC) starts time counting from the time when the signal line (IP) becomes “Low”, and the signal line (BS ₂ ) "L
When the back circuit (BCKC) has finished counting, the signal line (BS ₂ ) is set to “High”, and the camera body (BD) starts running the rear curtain with this signal.
In this way, when in M / LT mode, exposure time counting starts with the signal input from the camera body (BD) via the signal line (IP), not at the start of the first curtain, and 1 second Although the exposure time is not precisely controlled because it is controlled as the minimum unit, the error does not affect the exposure so much because the overall exposure time is long.

Normally, the timer corresponding to the film speed has finished counting up to the step of # 135, and when the timer finishes counting, a timer interrupt occurs and the signal line (IP) is set to “High” at the step of # 145. "Stops the imprinting operation, enables counter interruption and returns to the main routine. In step # 135, the signal line (IP) may be "Low" even when the trailing curtain starts running when the exposure time is short. Therefore, in order to forcibly stop the imprinting operation (to prevent imprinting during winding), the signal line (IP) is set to "High". In step # 136, the signal line (CS) is used to stop the imprinting operation by the back circuit (BCKC).
A low-level pulse of a certain duration is sent to B), and the back circuit (BCKC) terminates the copying operation when this pulse is input from the signal line (CSB). Then, the counter and the timer interrupt are not accepted, and the process waits for the trailing curtain to be completed and the switch (S ₄ ) to be turned “ON”. Then, when the switch (S ₄ ) is turned "ON", the flags RLEF and BCKF are set to "0".
Then, the process returns to step # 2 and the above-mentioned operation is performed.

When the continuous shooting mode such as the interval function / bracket function is selected in the back circuit (BCKC), the "Low" signal remains input from the signal line (BS ₂ ), and Preparatory operation for exposure control is being performed. Immediately after the winding is completed and the switch (S ₄ ) is turned off, the next exposure control operation is performed. Also, the release switch (S ₂ ) is "ON".
Even when it is left as it is, such continuous shooting is performed.

When the camera body (BD) is activated by the signal from the signal line (BS ₁ ) of the back circuit (BCKC), the automatic focus adjustment is not performed, but the flash unit (F
L) Start-up to start boosting and back circuit (BCK
The width of the starting pulse may be distinguished from the starting when the key operation of C) is performed, and the automatic focus adjustment operation may be performed when the key operation of the back circuit (BCKC) is performed. Furthermore, a buzzer or the like that warns of camera shake is also used as a device that does not operate when activated by the back circuit (BCKC) but operates when activated by the photometric switch (S ₁ ). In addition, the signal from the back circuit (BCKC) is a pulse with a width of a certain time or less in order to determine what the start signal is due to the microcomputer (BMC), but different from the switch (S ₁ ) If input is made to the input port, such measures as limiting the pulse width are unnecessary.

The back circuit (BCKC) allows exposure time control longer than the maximum exposure time of the camera body only in M / LT mode, but in any mode if the exposure function is selected. It may be possible to control the exposure time for a long time, or even when an external function is selected.

Also, during interval shooting, a start signal is sent to the camera body (BD) one minute before the shooting operation of one group is started, and the camera body (BD) exchanges data with the flash device (FL). The boosting of the flash unit (FL) is starting. By the way, since the flash device continues the boosting for 15 minutes when the boosting operation is started, the boosting is very often continued even after the photographing of one group is completed. If the group interval is very long, the boosting after the shooting of one group is wasted and the battery is wasted. Therefore, when the shooting of one group is completed, the data indicating that the shooting of one group is completed is sent from the back circuit (BCKC) to the camera body (BD) (for example, the least significant bit of the back ICP is set to “1”). When this data is input, the camera body (BD) sends a boosting prohibition signal to the flash device (FL) (flash device (FL)
Of the 3-byte data to be transmitted to the flash device (FL), or the flash device (FL) may stop the boosting operation when this data is input.

Next, the relationship between the function of the back (BCK) and the display and a specific example of the back circuit (BCKC) will be described.

FIG. 4 shows an external view of the back (BCK). (1) is the battery cover of the battery chamber, and (2) is the external display, which shows the operation stopped state. (3) shows a key cover for protecting some keys of the operation key section, (4) shows a grip section, and (5) shows an operation key section.

FIG. 5 shows a state in which the external display portion is in an operating state and the key lid (3) is opened in FIG. The function of each key will be described. (6) is a function key for selecting each function. (7) is a mode key to select a mode in each function. (8) is the operation key,
Switches execution and non-execution of each function.
(9) Enter key to change the external display in sequence.
(10) is an adjust key to change the external display from the control status to the numerical setting status and from the numerical setting status to the control status. (11) is the up key and (12) is the down key to change the value in each mode and shift the program line. (13) is a cursor key, and sends each digit to be changed when changing the value in each mode. (14) is a memory key that accepts photometric data from the camera. (15)
Use the memory clear key to clear all the photometric data imported with the memory key.

Fig. 6 shows the operating status in the external display, EXPOSURE
The P ₁ mode of the function is displayed. Each display section will be described. (16) is a character display section that uses a 5 × 7 dot liquid crystal display for 10 digits, and displays shutter speed values, aperture values, mode names, operating procedure messages, and the like. (17) shows the display positions of the shutter speed value <T> and the aperture value <F>. (18) displays the mode selected in EXPOSURE function. (19)
Indicates each function name. Every time the function key (6) is pressed, EXPOSURE → (MULTI ・ M) → (BRACK
ET) → IMPRINT → INTERVAL → B & W → EXPOSURE → …… MULTI M function and BRACKET function are skipped and cannot be selected when EXPOSURE function is not executed. Moreover, EX
The TERNAL function can be executed only when the control data from the camera body (BD) is input from the camera body (BD) when the EXPOSURE function is in execution, and cannot be selected with the function keys. (20) is a symbol indicating the selected function on the external display. (21) is a symbol indicating that each function is in the execution state. (22) is an index showing the shutter speed value, and (23) is an index showing the aperture value. When the shutter speed value is 2 seconds or less When the aperture value is F32 or more To display. (24) is the graphic display (2
5) indicates a photometric line, which is referred to as an EV line in the following because it shows an equal EV value. (26) shows the P ₁ mode with a slope of 2/3, which is a high-speed program on the program line. Depending on the lens, the limit is F1.4 on the open side and F22 on the aperture side,
Further, the arbitrary aperture restriction is performed between F2 and F8 and F11. Lowercase numbers are 1 / in the character display area
It shows 4EV units and displays the control point <1/60, F4 + 1 / 4EV>, which is the intersection of the program line and the EV line.

FIG. 7 shows the P ₂ mode in which the slope of the program line is 1/1, and FIG. 8 shows the slope of the program line in 1/2.
Shows the P ₃ mode. As you can see from this figure
In the P ₁ mode, the graphic display dots are on the F value side.
In 1EV Bitch, also when the P ₃ mode Exposure time side display dot 1EV Bitch is displayed as a straight line. Table 1 shows the transition of each function and each mode. The mode in the double frame is initially set at power-on reset such as battery replacement. The operation procedure for each mode in each function will be described.

FIG. 9 shows the P ₂ mode of the EXPOSURE function. By FUNC key (6) Move to select the EXPOSURE function, then MO
Put out a "PROGRAM2" display mode name displayed on the character display unit (16) by the DE key (7), is set to P ₂ mode. In the EXPOSURE function mode display (18), the "▼" mark is lit above the "P". In the graphic display (24), the camera shutter speed limits 1/4000 seconds and 30 seconds and the lens control limits F1.4 and F2
At 2 the program line is restricted. In addition, the inclined part of the program line passes the point of F5.6 for 1/250 seconds in the initial setting state. Then press the OPE key (8)
The XPOSURE function is in the running state, (21) lights up, and an EV line (25) corresponding to the photometric value appears. Next, press the ENT key (9) to switch from the mode name display (“PROGRAM2”) to the control display (hereinafter called OUTPUT display). In this case, the shutter speed value 1/60 second and F2.8, which is the intersection of the program line and the EV line, are displayed in the character section (Fig. 11). In the OUTPUT display, the UP line (11) and DOWN key (12) can be used to shift the slope of the program line. FIG. 12 shows a state of shifting to the right by the UP key (11). Next, press the ADJ key (10) to switch to the setting display (hereinafter referred to as INPUT display), and first ask the FMAX value. Thirteenth
In the figure, the FMAX value is F22 because it is the initial setting. DOWN
When the FMAX value is lowered to F8 with the key (12), the inclined part of the program line stops at F8, as shown in Fig. 14.
There are restrictions. After setting the FMAX value, go to FMIN with the ENT key (9). In Fig. 15, the character display switches to FMIN value setting. F for initial setting
1.4 is displayed. Change the FMIN value with the UP key (11). FIG. 16 shows a state in which F2.8 is set. Next, press the ENT key (9) to confirm that “COMPLET”
The ED "display is displayed in the character section. When the completion display appears, the ADJ key is used again to switch to the OUTPUT display, and the character display section displays the camera control value (Fig. 18).

Next, the S mode (shutter speed priority mode) of the EXPOSURE function will be described. When the "S MODE" is displayed on the character display portion by the MODE key (7) and the S mode is selected, the display is as shown in FIG. here
It is in the execution state by the OPE key (8). (Also, due to the lens, it is limited to F1.4 and F22.) When switching to OUTPUT display with the ENT key (9), an underline (cursor) is displayed in the shutter speed value display section of the character display section (16). (Fig. 20). The underline indicates that the value can be changed with the UP key (11) or DOWN key (12). 1 with UP key (11)
If you change from 125 seconds to 1/500 seconds, it will look like Figure 21. At the same time, the aperture value also changes to the proper exposure value.

Next, the A mode of the EXPOSURE function (aperture priority mode) will be described. When the "A MODE" is displayed on the character display portion by the MODE key (7) and the A mode is selected, it is displayed as shown in FIG. OPE key (8)
Is being executed by. Also, 30 seconds depending on the camera And 1/4000 second is limited. O with the ENT key (9)
When switching to UTPUT display, an underline is displayed in the aperture value display section of the character display section (16), indicating that the numerical value can be changed (Fig. 23). Change from F5.6 to F11 + 2 / 4EV with the UP key (11), and the result will be as shown in Fig. 24. At the same time, the shutter speed value also changes to the proper exposure value.

Next, the M mode (manual mode) of the EXPOSURE function will be described. When the "M MODE" is displayed on the character display section (16) by the MODE key (7) and the M mode is selected, it is displayed as shown in FIG. It is in the execution state by the OPE key (8). Also, the shutter speed and aperture are limited by the camera and lens. When the display is switched to the OUTPUT display with the ENT key (9), it becomes as shown in Fig. 26. At this time, an underline is displayed in the shutter speed value display section, indicating that the numerical value can be changed (Fig. 26). Change from 1/250 seconds to 1/1000 seconds with the UP key (11), and the result will be as shown in Fig. 27. Next, move the underline (cursor) to the aperture value display with the cursor key (13) (Fig. 28), and change from F5.6 to F2.8 + 2 / 4EV with the DOWN key (12), as shown in Fig. 29. become. When the cursor key (13) is operated again, the underline shifts to the shutter speed value display section, and the shutter speed can be changed.

Next, the long time mode of the EXPOSURE function will be described. Press the MODE key (7) to display "M MODE / LT" on the character display and select the long time mode. The display is as shown in Fig. 30. It is in the execution state by the OPE key (8). When you switch to the OUTPUT display with the ENT key (9), it becomes as shown in Fig. 31. The underline indicates on the aperture value display that the aperture value can be changed, but the cursor key (13) is disabled and the shutter speed value (long time) cannot be changed.
Not possible with OUTPUT display. Then use the ADJ key (10) to INP
When changed to UT display, the shutter speed value can be set as shown in Fig. 32. The shutter speed value (long time) can be set from 10 seconds to 9990 seconds.
Can be set in seconds. The underline is first set at the thousandth digit, and sequentially shifts to the hundreds digit, the tenth digit and the ones digit, and the thousandth digit again, and the UP key (11) or DO
Use the WN key (12) to change the value (Fig. 33, 34)
Figure). When the setting of the shutter speed value (long time) is completed, switch to the OUTPUT display with the ADJ key (10) again. The camera control value is displayed on the character display (Fig. 35).

Next, the AVERGE mode for performing the average calculation of the MULTI.M (multimetering) function will be described. This MULTI / M function can be set with the FUNC key (6) when the EXPOSURE function is in the execution state. FUNC while the EXPOSURE function is running
Select MULTI / M function with the key (6),
Next, press the MODE key (7) to display the character display (16)
Set “AVERGE” to “AVERGE” and set each mode to AVERGE mode (Fig. 36). Here, the EXPOSURE function mode is set to P mode from the mode display. OP
Execution is enabled by the E key (8), and the M key (1
By 4), the photometric value can be taken in.
-6 shows the controllable range at the top of the graphic display
Indicators (EV) to 6 (EV) are displayed on the LCD. In addition, the graphic display shows the gap between highlight calculation and shadow calculation. Indicates out of conjunction with Is on the left and right. One step above the index in the middle Is the first photometric point and is usually in the middle (0
Position) Position. When OUTPUT is displayed with the NET key (9), the shutter speed value and aperture value calculated in the EXPOSURE function P mode (for example, P ₂ mode) are displayed at the character display section (1) by the first photometry point.
Displayed in 6) (Fig. 37). At this time, "A" of "AVERGE" is displayed in the middle to indicate that it is in AVERAGE mode. Next, when the M key is operated, the value of the first photometric point that is one step above the index is taken in, and one step below the index display. Will shift. At the same time, the second photometric point is the first
It appears one step above the index display based on the photometric point of (Fig. 38). At this time, the value of the first metering point that was taken in is in the AE locked state, and the character display section (16) is calculated in the mode selected by the EXPOSURE function (this time is P ₂ mode). The shutter speed value and aperture value are displayed. M again
When the key (14) is operated, the value of the second photometric point is taken in, the first and second photometric points move to a state of being balanced with respect to the 0 position reference, and the character display section displays the first and second photometric points. the photometric point value average calculation, and a shutter speed value at P ₂ mode, is displayed by calculating the aperture (39 view). Also at this time, the third photometric point appears on the upper stage of the index display. Below, M key (1
By sequentially operating 4), you can capture and display the photometric values up to 8 points, but from the 9th point, the 1st point will be replaced, and the latest 8points of metering will be displayed. Points can be captured and calculated. FIG. 40 shows a state in which three photometric points are taken in, and FIG. 41 shows a state in which the highest eight photometric points are taken in. Here, when the MODE key (7) is operated, the character display section (16) changes from OUTPUT display to mode name display and "CENTER" is displayed. The CENTER mode is a mode for averaging the MAX value and MIN value of the photometric value, and the point indicating the MAX value and the MIN value of the photometric points captured one drop below the index display in the graphic display section. Move to a balanced position (Fig. 42). Next, use the ENT key (9) to display the OUTPUT, and the shutter speed value and aperture value calculated on the character display (16) and the "C" in the CENTER mode between them.
Is displayed (Fig. 43). Press the MODE key (7) again to HIGH
The mode changes to LIGHT mode and "HIGHL" appears on the character display.
The mode name display of "IGHT" is displayed. At the same time, the point display showing the MAX value of the captured metering points is plus 2.3.
It moves so as to come to the Ev position, and the entire metering point display taken in moves based on the point display showing the MAX value (Fig. 44). At this time, the number of metering points that extend beyond minus 6 Ev is displayed at the minus 6 Ev position. Next, the NET key (9) is used to display the OUTPUT, and the shutter speed value and aperture value calculated based on the highlight reference and "H" in HIGHLIGHT mode are displayed between them in the character display section (Fig. 45). Once again, press the MODE key to change to SHADOW mode, and the mode name display of "SHADOW" will be shown in the character display area. The point display showing the MIN value of the metering points captured at the same time moves so as to come to the position of minus 2.7 Ev, and the entire metering point display captured with reference to the point display showing the MIN value moves (46th Figure). At this time, the number of metering points protruding from the plus 6Ev is displayed at the plus 6Ev position. Next, the ENT key (9) is used to display the OUTPUT, and the shutter speed value and aperture value calculated by the shadow reference, and the "S" in SHADOW mode between them are displayed on the character display section (Fig. 47). Repeatedly MODE key (7)
When is operated, it returns to AVERAGE mode again and repeats in sequence. In addition to the modes described above, the MULTI / M function has another mode. When the EXPOSURE function is in M (manual) mode, the MULTI / M function is in MANUAL mode and other modes do not appear.
The MODE key (7) is invalid. In the MANUAL mode, the control value is just the setting value in the M mode of the EXPOSURE function, and the 0 position on the index display is the setting value. Therefore, the photometric value from the camera is present at a position displaced by the amount of deviation from the set value as shown in FIG. The ENT key (9) changes to OUTPUT display, and the character display section (16) displays the shutter speed value and aperture value, which are the set values, and "M" between them (Fig. 50). Since it is in the execution state by the OPE key, the photometric points are taken in by the M key as in the other modes. One in Figure 51, two in Figure 52,
FIG. 53 shows a state in which eight pieces are taken in. In these, the character display section (16) remains unchanged from the set value and does not change. As shown in FIG. 53, the graphic display allows the photometric distribution of a certain subject to be judged at a glance.
Here, the UP key (11) or the DOWN key (12) can be used to move the entire photometric distribution map consisting of the captured photometric points to the left and right. In Fig. 54, since the shutter speed value display area is underlined, the shutter speed value is changed at the same time as the photometric distribution map moves with the UP key (11). Therefore, with this function, it is possible to perform exposure control according to the brightness distribution of the subject, and it is also possible to arbitrarily change the width of highlight and shadow exposure fixed to 2.3Ev and 2.7Ev. If the underline is moved to the aperture value with the cursor key, the aperture value will be changed. In the above description,
UP the points that are judged to be the most appropriate in the photometric distribution map
By using the key (11) or the DOWN key (12), the shutter speed value or the aperture value can be arbitrarily changed to move to the 0 position of the index display, and an appropriate value for the subject can be set by one's own judgment. it can. That is, this MULT
It can be said that the MANUAL mode of the I / M function is a kind of metered manual in a generally known manner.

Next, the BRACKET function will be described. This function is used to shift the exposure value based on the captured photometric data. It is possible to shoot up to 9 frames by shifting, and you can set the shift start value, shift width, and number of shots. This function is also skipped and cannot be selected if the EXPOSURE function is not in the running state. Fig. 55 shows the state of mode name display, showing that P mode is selected with the EXPOSURE function, and the index indicating the shift start value and shift amount is displayed at the top of the graphic display (24). Has been done. This indicator is MULTI
Although it is common with the one showing the photometric range of the M function, a non-common one may be provided separately. An index indicating the offset range is displayed on the graphic display portion. Moreover, the BRACKET function is in the non-execution state. Press the ENT key (9) to display OUTPU as shown in Fig. 56.
The display changes to T. The character display (16) shows the amount of deviation from the reference value and the number of remaining flames.
Further, since it is in the execution state by the OPE key (8), a display showing the operation state of the BRACKET function is newly displayed in the same shift range under the index on the graphic display section (24). Then press the ADJ key (10) to set OUTPU
When the T display is changed to the INPUT display, as shown in FIG. 57, the message "FROM" first appears on the character display section (16) to set the shift start value. Here, enter the underlined number with the UP key (11)
Alternatively, when the desired value is changed by the DOWN key (12), the index and the operation display are moved as shown in FIG. 58 together with the key input. Next, press the ENT key (9) to display the message "STEP" for setting the shift width in the character display (1
Appears in 6) (Fig. 59). Shift width is 1 / 4Ev, 1 / 2Ev, 1E
You can choose from 4 types of v, 2Ev, UP key (11) or DOW
Use the N key (12) to change and set the underlined value (Fig. 60). Then, by the ENT key (12), a message "FRAME" appears on the character display section so as to set the number of photographing films as shown in FIG.
If you change and set the underlined numerical value with the UP key (11) or DOWN key (12) (9 frames this time), the width of the indicator and the operation display on the graphic display part will shift. The shift range is displayed continuously from the start value to the final shift value (No. 62)
Figure). Next, by pressing the ENT key (12), the message "COMPLETED" will be displayed on the character display (16) to notify the completion of setting. If you press the ENT key (12), the display will return to "FROM" and the setting display will be repeated. Press the ADJ key (10) to change from INPUT display to OUTPUT display,
The character display (16) shows the amount of deviation from the reference value,
Display the number of remaining frames (Fig. 64). The next time you release the camera, the photometric value at that time will be locked, and the exposure value of each flame that is shifted based on that photometric value will be the mode selected by the EXPOSURE function, this time the P mode (P _The camera is controlled by being converted by the shutter speed value and the aperture value calculated in any one of ( ₁ , P ₂ , P ₃ modes). FIG. 65 shows the state in which the camera is released once, and the character display section (16) displays the amount of deviation of the exposure value controlled by the next release from the reference value and the number of remaining flames. Then, the graphic display section (24) changes so as to display the range from the next control (exposure) value to the final (exposure) value in the operation display.

Figure 66 shows the camera released twice.
FIG. 67 shows a state where the camera is released eight times.
The number of remaining flames on the character display part (16) is displayed as "1", indicating that there is one remaining flame.
In the graphic display section (24), only the final value is displayed. Next, release the camera to shoot the last frame that was set.
6) and the graphic display section (24) are reset to the initially set values, and as shown in Fig. 68, change to a state in which new photometric values can be taken in again, and the display state becomes the same as in Fig. 64.
Repeatable camera control is possible. When the BRACKET function is running and the BRACKET function is executed by changing the display on the external display (2) to EXPOSURE function, if the EXPOSURE function selects P, S, A mode, The Ev line moves in parallel on the program line, and when the M mode is selected, the aperture value line moves in parallel, so it is easy to execute the BRACKET function. Can be confirmed.

Next, the imprinting function will be described. When the imprint function is selected by operating the FUNC key (6), the mode becomes the exposure control data imprint mode,
When the OPE key (8) is operated, it becomes active. At this time, if the exposure function is selected, the diagram and Ev line at that time are displayed (Fig. 69). When the ENT key (9) is pressed, the control value (camera control value) calculated by the back circuit (BCKC) at that time is displayed (70th
(Figure) This data is imprinted. On the other hand, when the exposure function is not selected, when the ENT key (9) is pressed, the data sent from the camera body (BD) is displayed as the imprinted data. In this case, graphic display is not performed.

Press MODE key (7) to enter year / month / day mode, and the mode name will be displayed on the character display (16) (71st
Figure). Next, press the ENT key (9) to display the data from the calendar microcomputer (CAMC) (Fig. 72). If shooting is performed in this state, the data of this character display section (16) is imprinted. Also, in the state shown in Fig. 72, ADJ key (1
Press (0) to change the data, and the cursor is displayed in the year data display (Fig. 73). Then, when the cursor key (13) is pressed twice, the cursor is displayed below the day data display section, and in Fig. 75, the UP key (11) is pressed three times to change the day data from 12th to 15th. is there. When the ADJ key (10) is pressed in this state, the display state shown in Fig. 75 is obtained and this data is imprinted. Note that the imprinting is performed even in the display state of FIGS. Further, if the calendar data is changed (data from the calendar microcomputer (CAMC)), the display data is also changed. Each time the MODE key (7) is pressed in this state, the imprint mode is changed in the order shown in Table 1, and the hour, minute, and second modes are also changed.
Further, when the MODE key (7) is pressed, the up count mode is set. FIG. 76 shows the mode name display state of this up-count mode. When the ENT key (9) is pressed in this state, the display state shown in FIG. 77 appears. Then, when the ADJ key (10) is pressed, a cursor appears and the data corresponding to the position of the cursor can be changed with the up key (11) and the down key (12). Up key (11) 0 → 1 → ...
… → 9 → − → Blank → 0 …… in the order of down key (1
In 2), it changes to the opposite. FIG. 79 shows a state in which the data change is thus completed. If you press the ENT key (9) in this state, the cursor will appear as shown in Fig. 80. When shooting is performed in this state, the data incremented by "1" is sequentially printed. There is no carry to the blank digit. When the MODE key (7) is pressed in the up count mode, the down count mode is set and the mode name display shown in FIG. 81 is displayed. In the following, initial data is set in the same procedure as in the up-count mode, and the display at the end of setting is shown in FIG. In both of these modes, the data that is changed and imprinted at the time of shooting is displayed on the character display unit (16).

When the MODE key (7) is pressed in the down count mode, the fixed data imprinting mode is set and the display state shown in FIG. 83 is obtained.
When the ENT key (9) is pressed below, the display state shown in Fig. 84 is displayed, and when the ADJ key (10) is pressed, the display state shown in Fig. 85 is displayed. Figure 86,
Change the data as shown in FIG. 87 and press the ENT key (9) to obtain the state shown in FIG. 88. This mode is OPE
Unless the key (8) or MODE key (7) is operated, the set fixed data is imprinted.

When the B & W function is selected by the FUNC key (6), the imprinting time for monochrome film is controlled.
With this function, mode switching cannot be performed, and the setting state of the imprint function is maintained. When this function is selected, it is the imprinting function for monochrome film, and when the B & W function is not selected, it is the imprinting function for color film. When the B & W function is selected, the imprinting function may be invalidated so that the same operation as the imprinting function can be performed. When the B & W function is selected, the imprinting time becomes long.

Next, the INTERVAL function will be described. This function allows the camera to be activated at certain time intervals and the shooting to be performed automatically in sequence. In the interval function, the interval time,
The number of frames at each interval shooting (hereinafter, referred to as frame number), the number of times the interval is repeated (hereinafter, referred to as group number), and the first release start time of interval shooting (hereinafter referred to as start time) can be set.

FIG. 89 shows the mode name display of the interval function. In the non-execution state, the ENT key (9) is invalid. Further, the graphic display section (24) is in a state of no display by this function. When this interval function is set to the execution state with the OPE key (8), execution is started toward the start time. Also, if you want to immediately execute the first release of the interval, you can start it by canceling the start time by putting it in the execution state with the OPE key (8) and releasing the camera. There is. Next, press the ADJ key (10) to OUT
The PUT display changes to the INPUT display, and as shown in Fig. 90, the interval time can be set first. The INTERVAL time "I" is displayed on the character display section (16), and "H (Hour), M (Minu
The letters “te), S (Second)” are displayed together with the numerical value.
In addition, the underline indicates where the value can be changed,
Use the UP key (11) or DOWN key (12) to change the value, and use the cursor key (13) to move the changed position to set the interval time (Fig. 91). Interval time is 0 seconds to 99 hours 59 minutes. It can be set up to 59 seconds.
Next, the ENT key (9) is used to change the setting display of the number of frames ("F") and the number of groups ("G") as shown in FIG. Enter the value underlined with the UP key (11) or
Use the DOWN key (12) to change, and the cursor key (13) to move the changed position to set the number of frames and groups (Fig. 93). The number of frames can be set up to 9 frames, but when the BRACKET function is in the execution state, the number of frames in the BRACKET function has priority. The number of groups can be set up to 99 groups. Then press the ENT key (9)
As shown in Fig. 94, the display changes to the start time setting display. The start time can be set to what hours, hours, and minutes. The START time "S" is displayed on the character display (16) and "D (Da
te), H (Hour), M (Minute) ”are displayed together with the numerical value. Underlined numerical value is UP key (11)
Alternatively, use the DOWN key (12) to change the value, and use the cursor key to move the changed point and set the start time. Then ENT
By the key (9), the character display (16) changes to the "COMPLETED" display of setting completion (illustration omitted), and then ADJ
Press the key (10) to change the INPUT display to the mode name display again (Fig. 95). As a result, when the interval function is started, press the OPE key (8) to activate it and ENT key (9) to display the OUTPUT. The start time will be displayed on the character display (16) as shown in Fig. 96. To be done. After the first release of the interval is executed, the remaining time until the next release is displayed in hours / minutes / seconds (“H, M, S”) on the character display (16) ( (Fig. 97).

FIG. 98 is a block diagram showing a specific example of back rotation (BCKC). (CMC) is a control microcomputer, and by key input,
Functions, modes, data settings, exposure calculation, display data creation, imprint data creation, and imprint operation control. Furthermore, a display unit (SD), which will be described later,
It also controls (DD) and (CD), exchanges data with the calendar microcomputer (CAMC) and display microcomputer (DMC), and exchanges data with the camera body (BD). (CAMC) is a calendar microcomputer, which also controls calendar data for imprinting, interval control, and long exposure time (long time) control.

The switch (M) is a switch that is closed by pressing the memory key (14) in Fig. 5, and the switch (CL) is a memory
Switch that is closed by operating the clear key (15), (CU
R) is a switch that is closed by operating the cursor key (13), (ENT) is a switch that is closed by operating the enter key (9), and (UP) is a switch that is closed by operating the up key (11). The switch (DWN) is a switch that is closed by operating the down key (12). These six switches are connected to each input port of the control microcomputer (CMC) and also connected to the interrupt terminal (INTB) via the AND circuit (AG). Therefore, even if the control microcomputer (CMC) stops operating, the control microcomputer (CMC) starts operating when any switch is turned "ON". In addition, the switch (OPE) is a switch that is closed by operating the operation key (8), the (FUN) is a switch that is closed by operating the function key (6), and (ADJ).
Is a switch that is closed in conjunction with the adjust key (10), and (MOD) is a switch that is closed in conjunction with the operation of the mode key (7). Since these four switches are connected only to the input port of the control microcomputer (CMC), the control microcomputer (CMC) will not be activated even if these switches are turned "ON".

Next, the operation of the control microcomputer (CMC) will be described based on the flowchart of the control microcomputer (CMC) shown in FIG. First, the signal line (CSB) from the camera body (BD) is "Low"
When it falls to, operation starts from the No. 0 step by the interrupt pin (INTA). First, since the camera was started, the signal line (BS ₁ ) is set to "High", and then the interrupt pin (INT
Enables interrupt operation by A), then camera body (BD)
From which timing the interrupt signal is input. That is, in the No. 2 step, it is determined whether or not it is in the state of waiting for data input, and if it is in the state of waiting for data input, it is determined whether the imprinting data (Tv, Av) or the arithmetic data is input. Determine in step 3.3. This is because the signal line (BIO) is "H" when the signal line (CSB) falls to "Low" and the data is for calculation as described above.
If it is imprinted data, it can be identified because it is “Low”. When it is determined that the imprinted data is input, the sent data is read and No. 5 If it is determined in step No. 5 that the copy function is not selected, the copy operation is not performed and the process moves to step No. 15. On the other hand, if the copy function is selected, the process moves to step No. 6 and sends the data corresponding to the selected copy mode to the LED drive circuit (LDR) for the copy. By sending a synchronization signal to the signal line (CSLD) and sequentially sending data in units of 4 bits, and setting the signal line (LDEN) to "Low" to activate the display operation of the drive circuit (LDR), Segmenno light emitting diode The (LED) is dynamically driven according to the image data, and the image is recorded, and the control microcomputer (CMC) counts the time according to the film sensitivity read from the camera body. , Even if the read film sensitivity is the same data as the imprint function, it counts for a different (long) time, and when the count ends, the signal line (LDEN) is set to “Hi”.
gh "to stop the capturing operation by the drive circuit (LDR). When the trailing curtain starts running on the camera body (BD), a" Low "pulse is output to the signal line (CSB). Therefore, at this time as well, the interrupt signal is input to the interrupt terminal (INTA), and since it is not waiting for data input at this time, No. 11
Go to step. Then, if it is determined in step No. 11 that the copying operation is in progress, the process moves to step No. 10 to set the signal line (LDEN) to "High" and forcibly stop the copying operation. . This prohibits the copying operation from being performed during film winding. No.15
In step, the switch (SCN) on the camera body is turned “ON”.
Determine whether or not. If the switch (SCN) is "ON", the operations of steps No. 16 to 21 are not performed and No. 40
Go to step. On the other hand, the switch (SCN) is "OF".
If it is F ", then it is determined whether or not it is the count-up mode. Then, if it is the count-up mode," 1 "is added to the register CR in which the imprint data is set, and the process proceeds to No. 40. , If it is not the count-up mode, then it is determined whether it is the count-down mode or not, and if it is the count-down mode, "1" is subtracted from the content of the register CR and the process proceeds to the step of No.40.
If it is not the countdown mode, determine whether it is the bracket function next. If it is the bracket function, subtract "1" from the register BR in which the number of frames of the bracket function is set, and proceed to No. 40 step. No.4
Move to step 0. The switch (SCN) is "ON"
Even if the data is copied, the switch (SCN) is discriminated between the steps No.4 and No.5, and if the switch (SCN) is "ON", the data is immediately transferred. .Four
You may make it shift to the step of 0.

In the step of No.3, it is not the imprint data (signal line (BI
If it is determined that O) is "High"), the process proceeds to No. 25 and the data is read from the camera body.
And when the exposure function is selected
Go to step No. 27, and signal line (BIO) is "Low"
Wait for And the signal line (BIO) is "Low"
Then, the back ICP (“80H”) is output. The camera body (BD) receives the signal line (BI
O) is set to "High", the signal line (CSB) remains "Low" and waits for the control microcomputer (CMC) to perform an operation.
The signal line (BIO) is set to “Low” when a sufficient time has passed for the calculation. In the control microcomputer (CMC),
In step No. 28, the back ICP is output and the exposure calculation subroutine is executed. When the calculation operation is completed, it waits for the signal line (BIO) to go to "Low", and when it goes to "Low", the above-mentioned control data (Tv, Av), exposure control mode, out-of-interlocking data, release enable / disable data, etc. To move to step No.40.

When the control microcomputer (CMC) is activated by the pulse output to the signal line (CSB) when the camera body (BD) starts operating, or the pulse at the time when the trailing curtain starts running is input. At this time, when it is not the imprint function or when the imprint operation is completed, the process immediately shifts to step No. 40. Switch (M),
(CL), (CUR), (ENT), (UP), (DWN) is turned on and an interrupt signal is input to the interrupt terminal (INTB), or an interrupt is generated by the interrupt terminal (INTA). When the operation by is completed, No.40
Start the operation from step. In step No.40, the timer TIR register (for operating time counting) is reset, and the flag IOF that determines whether data is input or output from the calendar microcomputer (CAMC) is set to "1".
Go to step o.42. In step No.42, it is determined whether the flag IOF is "0". If it is "1", the data from the calendar microcomputer (CAMC) is read and the flag IOF is reset to "0". Transition. On the other hand, if it is determined in step No.42 that the flag IOF is "1", the data is sent to the calendar microcomputer (CAMC), the flag IOF is set to "1", and the process proceeds to step No.47. To do. The method of data transmission / reception is to set the signal line (CSCA) to “Low”, and when outputting data, the signal line (I / I
O) is “Low”, and the signal line (I
/ O) to "High". When the signal line (CSCA) goes "Low", the calendar microcomputer (CAMC) is interrupted and the calendar microcomputer (CAMC) outputs a pulse for data transfer synchronization. In synchronization with this pulse, 4-bit data is sequentially transmitted and received via the data bus (DBUSI). The data sent from the calendar microcomputer (CAMC) to the control microcomputer (CMC) is the current year, month, day, hour, minute, second, and time until the start of the next shooting operation for interval shooting,
Minutes, seconds, and whether interval shooting is active,
There is data indicating whether or not the interval shooting is finished. Therefore, the control microcomputer (CMC) creates the imprinting data based on these data, and also creates the remaining time display data until the start of the next shooting operation at the time of the interval function, and also inputs the interval end signal. If it does, the interval function is canceled. In addition, the data sent from the control microcomputer (CMC) to the calendar microcomputer (CAMC) is the start date, hour, minute of interval shooting, hour, minute indicating the interval shooting interval,
There are data such as seconds, number of groups for interval shooting, number of frames for interval shooting, set exposure time in M / LT mode, whether interval function is selected, and whether M / LT mode is selected.

In the step of No. 47, the states of the switches (M) to (MOD) are discriminated and it is discriminated whether or not the key operation is performed. If there is no key operation, immediately N
Go to step o.50. On the other hand, if the key operation is performed, the operation according to the state of the switches (M) to (MOD) and the state of the control microcomputer at that time is performed.
In the step of, set the signal line (BS ₁ ) to "Low" to start the camera body and move to the step of No.50. This No. 48 subroutine is shown in FIGS. 103 and 104, and the specific operation is omitted because the relationship between the operation of each key and the setting data and display has already been described.

When the No. 48 step subroutine and No. 49 step operation are completed, the interrupt signal can be accepted to the interrupt terminal (INTA) and the display data is sent to the display microcomputer (DMC). In this operation, first, the signal line (DEN) is set to "Low" to activate the display units (SD), (DD), (CD), then the signal line (CSDM) is set to "Low", and the display microcomputer ( DM
The data is output to C) and the signal line (D
Synchronous pulse is output from CK ₂ ) and data is sent in 4-bit units. The data sent according to each function and mode and the display will be described later based on the operation of the display microcomputer (DMC). In the figure, the enable terminal is used, but when the signal line (DEN) becomes "Low", power is supplied to the display sections (SD), (CD), (DD). There is.

When the data transfer is completed, determine whether any of the switches (M) to (MOD) is "ON" in step No.52, and if it is "ON", reset the register TIR. If none of the switches are "ON", add "1" to the contents of the register TIR and move to the step of No.55. Then, in the step of No. 55, it is judged whether or not the content of the register TIR has reached the constant value “K”. If it is determined in step No.55 that the content of the register TIR has reached “K”, it means that a certain time has passed since no key operation or data exchange with the camera body (BD) was performed. At this time, the signal line (DEN) is set to "High" to stop the operation of the display unit, enable the operation by the interrupt signal to the interrupt terminal (INTB), and stop the operation.

FIG. 100 is a flowchart showing a specific example of the calculation subroutine of No. 29 in FIG. 99. First, it is determined whether or not the bracket function is selected, and if it is not selected, the A flag is reset. If it is selected, it is determined whether or not the bracket function operation is being performed. Set. Then, after resetting or setting the A flag, the Ev value is calculated from the data from the camera body (BD). On the other hand, if the bracket function is in operation, the Ev value obtained when the operation is started is not changed, and therefore the operation proceeds to bracket operation.

When the current Ev value is obtained, it is next determined whether or not the data from the meter (MET) has been fetched, and if it has been fetched, it is set as an external function and the data from the meter (MET) is controlled. When the control limit is exceeded, the limit value is used as the control value, as in the calculation in the camera body (BD). If there is no data from the meter (MET), then it is judged whether it is the M or M / LT mode, and if it is in this mode, the manually set Tv and Av are output. , M, M / LT mode, it is determined whether or not the next multifunction is selected, and if the multifunction is selected, the control Ev value is calculated based on the stored Ev value.

This multi-function calculation subroutine is
It is shown in Figure 102. In the center mode, the maximum Evmax and the minimum Evmin are obtained from the stored Ev values, and (Evmax + Evmin) / 2 is calculated from these two values to obtain the control Ev. If it is not the center, it is judged whether it is the highlight mode or not, and if it is the highlight mode, the maximum value of the stored Ev is calculated by Evmax−2.3 to calculate the control Ev. If it is not the highlight mode, then it is determined whether or not it is the shadow mode. If it is the shadow mode, the minimum value Evmin of the stored Ev is calculated by Evmin + 2.7 to calculate the control Ev. If it's not shadow mode, it's average mode. Is calculated to calculate the control Ev.

In FIG. 100, when the multifunction is not selected, the Ev from the camera is set as the control Ev. Then, based on the obtained control Ev, calculation is performed according to the selected mode among the P ₁ , P ₂ , P ₃ , A and S modes. A concrete example of this arithmetic subroutine is shown in FIG. In this calculation, when Evmax (= Tvmax + Avmax) <Ev, Evmin (= Tvmin + Avmin)> Ev, it is out of control interlocking, so the limit value is set as the control value, and the out-of-interaction flag is set, and the process returns to the main routine. On the other hand, when the operation is in the interlocking operation, the operation according to the sequence shown in the flowchart is performed to calculate the control value, the out-of-interlocking flag is reset, and the process returns to the main routine (FIG. 100). In addition,
In the camera body (BD), when the calculated value exceeds the control limit, the limit value is used as the calculated value and the set value is output as is, but in the back circuit, the limit value is set as the set value, and then
The set value is changed by recalculating from Ev and the limit value.
In the program mode, the limit aperture value can be set (not the maximum aperture value or the maximum aperture value).

When the control Tv and Av are obtained, it is determined whether or not the flag A is set to "1". If it is set to "1", the bracket function is selected and the operation is not performed. The operation shifts to. Also, during the bracket function operation, the process moves to the bracket calculation for the next shooting. First, determine whether it is M, M / LT mode, and when in M, M / LT mode, move the aperture value by the number of frames of the shift amount (the number of next shots),
Reset the A flag.

On the other hand, in the P ₁ , P ₂ , P ₃ , A, and S modes, Ev is moved by the number of frames of the shift amount, the A flag is reset, and the operation subroutine of Tv, Av is entered. When Tv and Av are calculated in this way, next, the bracket function is selected, shooting for the set number of frames is completed, and it is determined whether or not the signal line (BS ₂ ) is “Low”. And if it is "Low", in order to prevent shooting operation,
The release disable signal is set, and if the above conditions are not satisfied, the release disable signal is reset and the process returns to the main routine.

FIG. 105 is a flow chart showing the operation of the calendar microcomputer (CAMC). First, when the signal line (IP) of the camera body (BD) is set to "Low" at the start of the exposure control operation, the interrupt operation by the interrupt terminal (INTA) starts. Then, in step ST1, a timer interrupt (interruption every 1 sec) is enabled, and the process proceeds to ST2. In step ST2, switch (SC
N) is "ON", and if it is "ON", the interval and M / LT operations are not performed and step ST
Move to 20. On the other hand, if the switch (SCN) is "OFF",
Whether it is interval shooting or not is determined. If it is not interval shooting, then it is determined whether or not it is M / LT mode. And
In the M / LT mode, set the signal line (BS ₂ ) to “Low” and set M / L
If it is not the T mode, the process directly proceeds to step ST20.

If it is determined in step ST3 that interval shooting is in progress, the remaining time until the start of interval shooting is reset and the signal line (BS ₂ ) is set to "Low". Then, "1" is subtracted from the register IFR in which the number of frames is set, and if the content of the register IFR is not "0", the process proceeds to step ST20. On the other hand, if the content of the register IFR is "0", then "1" is subtracted from the register IGR in which the number of groups is set, and it is determined whether or not it has become "0". If it is "0", the interval end signal is set, and if it is not "0", the remaining time is set. Then, determine whether it is in M / LT mode, and if it is not in M / LT mode, set the signal line (BS ₂ ) to "High", and set M / LT
In the mode, the signal line (BS ₂ ) remains "Low" and the process proceeds to step ST20. And the interrupt terminal (INTA), (INT
It is possible to interrupt B) and determine whether the flag TIF is "1". If the flag TIF is "1", it means that a timer interrupt has occurred during this operation, and TIF is reset to "0" to stop the operation from step ST45. Meanwhile, the flag TI
If F is “0”, stop the operation.

Calendar microcomputer (CAMC) when the signal line (CSCA) is set to "Low" for the control microcomputer (CMC) to exchange data.
Operates with the interrupt pin (INTB) from ST25. ST
25 enables timer interrupts, then the signal line (I /
Determine whether to output or input data by determining the state of O). If it is data input, the data from the control microcomputer (CMC) is read in step ST27. If the M / LT mode is selected and the M / LT mode is not in operation, the exposure time data is set.If the M / LT mode is not selected or the M / LT mode is counting, ST30 remains unchanged.
Go to step. In step ST30, it is determined whether the interval function has been selected and is in the operating state. Then, if the interval function is not selected or is operating, the process directly proceeds to step ST20. On the other hand, if the interval function is selected and operation has not started, set the number of frames in the register IFR, the number of groups in IGR, the time interval between groups (remaining time), and the start time, and then proceed to step ST20. Transition. When it is determined in ST26 that the data is output, the above data is sent to the control microcomputer (CMC), and the process proceeds to ST20.

When the timer is interrupted every 1 second, the operation from step ST40 is started. If the operation is made by the interrupt terminals (INTA) and (INTB), set the flag TIF to "1" and the operation flow up to that point is started. Return. On the other hand, if such an operation is not performed or the operation by (INTA) and (INTB) is completed, the operation from step ST45 is performed. In step ST45, the rewriting operation of the calendar is performed in increments of 1 second. Then, it is determined whether or not the M / LT mode is operating, and if it is operating, the set second (Tv timer) changes to "1".
Is subtracted and it is determined whether the Tv timer has become "0". If it does not become "0", the process directly shifts to the step of ST62, interrupts by (INTA), (INTB) and the timer are enabled, and the operation is stopped. On the other hand, the content of Tv timer at step ST48 is "0" to start traveling of the rear curtain in the camera body (BD) as a "High" to be long as the signal line (BS ₂₎ becomes, the processing proceeds to step ST62.

When it is determined in step ST46 that the M / LT mode is not in operation, it is next determined whether or not the interval shooting operation is performed. Then, if it is not interval shooting, the signal line (BS ₂ ) is set to “High” and the process proceeds to step ST62. In this case, the operation key (8) may be operated during the operation of the M / LT mode and the interval function to bring the operation into a non-operation (stop operation) state. In this case, the signal line (BS ₂ ) is set to “High” to stop the M / LT and the interval, and the exposure control operation of the camera is stopped.

When it is determined in step ST55 that the interval function has been selected, the process proceeds to step ST56, and it is determined whether or not one minute before the start of one group shooting.
If it is a minute before, a "Low" pulse is output to the signal line (BS ₁ ) to activate the camera body (BD), and the flash unit (F
Start the boost operation of L). And in this case, the signal line (BS ₂₎ proceeds to ST62 step calculates the time until the start since the output "High". On the other hand, if it is determined in step ST56 that it is not one minute before, then it is determined whether or not it is the start time for shooting one group, and if the start time is reached, the signal line (BS ₂ ) is set to "Low". "To move to step ST62.
On the other hand, before or after the start, it is determined whether "Low" is output to the signal line (BS ₂ ) next,
If "Low" is output, the shooting operation for one group is in progress, and the process immediately moves to step ST62. On the other hand, if “High” is output to the signal line (BS ₂ ), it means that the shooting operation of interval shooting is started or between groups, and at this time, the remaining time until start is calculated.
Move to step ST62.

Next, we will explain the graphic display block consisting of the display microcomputer (DMC), LCD segment driver (SD), LCD common driver (CD), LCD drive reference power source (DD), and liquid crystal display (LCD). To do. First, the data (4 bits) shown in Table 2 is transferred from the control microcomputer (CMC) to the display microcomputer (DMC) via the data bus (DBUS2) based on the transfer clock (DCK2), and the graphic is displayed on the display microcomputer (DMC). Converted to display data and serially transferred to the LCD segment driver (SD). LCD segment driver (SD) is RAM for LCD display
1-bit data of the LCD display RAM corresponds to lighting or non-lighting of one dot of the liquid crystal display (LCD). The graphic display data is transferred to the LCD segment driver (SD) and then stored in the LCD display RAM, and the LCD segment drive signal (SGT) according to the contents of the LCD display RAM is sent from the LCD segment driver (SD). It is given to the liquid crystal display (LCD). The LCD common driver (CD) uses the internal oscillator to generate the timing signals necessary for display.
LCD common scan signal (CMT) that automatically scans the common signal of the liquid crystal display (LCD) according to the display duty.
Is output to the liquid crystal display (LCD). The LCD segment drive signal (SGT) and the LCD common scan signal (CMT) are synchronized by the synchronization signal (HS) supplied from the LCD common driver (CD) to the LCD segment driver (SD). The liquid crystal display (LCD) displays these two signals, the LCD
Segment drive signal (SGT) and LCD common scan signal (CM
T) for dot matrix graphic display. The reference power supply (DD) for LCD drive is the liquid crystal display (LC
Stable power supply (VDP) to drive D) LCD segment driver (SD) and LCD common driver (CD)
Is being supplied to.

The above is the data from the control microcomputer (CMC)
The outline of the operation until the graphic pattern is displayed on the liquid crystal display (LCD) will be described in more detail below with reference to the flow chart of the display microcomputer (DMC).

First, the display microcomputer (DMC) starts operating (power supply is started) by the signal line (DEN) from the control microcomputer (CMC) to the display microcomputer (DMC), and the reset routine shown in FIG. 106. Start (step). LCD segment driver (S
D) is initialized and the liquid crystal display (LCD) is turned off (all lights off). In step, it is judged whether it is in the all-lighting mode, and normally, the step is in the waiting state for interruption. This judgment of whether or not this is the full lighting mode is for a disconnection test at the factory. In the full lighting mode, all lighting data is output to the LCD segment driver (SD) (step), and the liquid crystal display (LCD) ) Lights, and stops the system clock in step. In the normal state, that is, in the all-lighting mode, the step wait state is entered and the control microcomputer (CMC) waits for an interrupt. The imprint routine shown in FIG. 107 is a routine for setting a flag for displaying an imprinting display (“IMP”) for a certain time during imprinting. Imprint signal from camera (I
P) to start (step), save the register in step, set the "IMP" display flag in step, and restore the register in step to restore the original main routine.

Fig. 108 The main routine starts (step) by the signal (CSDM) from the control microcomputer (CMC) to the display microcomputer (DMC), and the display microcomputer (DMC) at the step
Until all the processing within is completed, restart of the main routine is prohibited, the transfer data from the control microcomputer (CMC) shown in Table 2 is input in step, the power supply voltage is checked in step, and if the power supply When the voltage is equal to or lower than the predetermined value, the power supply voltage check flag (BC flag) is set in step. From step to step, the transfer data from the control microcomputer (CMC) is decoded into graphic display data.

This decoding is first performed on the character display section (16) (step), and the mode name display, INPUT display, O
It is converted to graphic display data corresponding to each display content such as UTPUT display, this data is output to the LCD segment driver (SD) and written to the LCD display RAM in this LCD segment driver (SD) ( Step). Subsequently, the index indicating the control range and the mode display section (18) are decoded in step and output to the LCD segment driver (SD) (step).

Next, the index (22) indicating the shutter speed value, the index (23) indicating the aperture value, and the symbol (21) indicating that each function is in the execution state are decoded into graphic display data (step). In step, the BC flag determined in step is tested, and if the BC flag is set, a battery check display (BC display) is displayed on the graphic display section (24) (step). If the BC flag is not set,
Depending on which function is selected in the external display, the operation according to that function is performed in steps, and the index (20) indicating this function itself is decoded (step), and these graphic display data are displayed. Output to LCD segment driver (SD) in step. Here, the calculation according to the function of the step will be described in detail.

If the exposure function is selected first,
To draw the Ev line (25), the appropriate aperture value for each shutter speed value is obtained while sequentially changing the shutter speed value. Then, the setting line (26) is drawn according to the exposure mode (P ₁ , P ₂ , P ₃ , S, A, M, M / LT) in the procedure shown in FIGS. 109 to 114. P _1, P _2, if P ₃ mode is selected, the lens minimum diameter aperture Avmax of the 109th view, lens open aperture value Avmin, lens small aperture side of the set limit value Avn, the open aperture Assuming that the setting limit value Avm on the side is Avm and the selected slope Avp, Avy is drawn while changing Tvx in the procedure shown in FIG. Briefly, first, set Tvx = -0.5 in step, draw a line segment in step, and then draw line segment ~ while incrementing Tvx (step ~). Finally Tv
Draw a line with x = Tvmax (step). The setting line in P ₁ , P ₂ and P ₃ modes, the calculation of Fig. 6- (26) is above, but the Avp line in P ₁ and P ₃ modes, Fig. 109-the line segment has a slope of 2 Since it is: 1 and 1: 2, the inclination becomes stepwise when drawn like the P ₂ mode, which is difficult to understand. Therefore, in the P ₁ and P ₃ modes, this point is devised so that the points (Tvx, Avy) obtained by calculation are aligned (6th, 8th).
See figure). FIG. 111 shows how to draw the setting line in S mode, and Tvn is the setting shutter speed.
Avy = Av while incrementing Tvx in steps
Draw a min line (line segment), then draw a Tvx = Tvn line (line segment), draw a line segment with Tvx = Tvn (step), and finally increment Av while incrementing Tvx again.
= Draw the Avmax line (segment). FIG. 112 shows how to draw a setting line in A mode, where Avn is the set aperture value. Set Tvx = -0.5 in step ~, draw a line segment, and increase Av while incrementing Tvx in step.
= Avn line (line segment) in steps Tvx = Tvmax
Toki and draw each line segment. Fig. 113 shows how to draw the setting line in M mode.
While incrementing Tvx, set the line (segment) of Avy = Avn, and in step, set Tvx = Tvn from Avy = Avmin
Draw a line (segment) up to Avy = Avmax. Where Avn,
Tvn is a set aperture value and a set shutter speed value, respectively.

Fig. 114 shows how to draw the setting line in M / LT mode. In step ~, set Tvx = -0.5, Avy = Avmin to Avy = A.
Draw the line (line segment) up to vmax while incrementing Tvx in steps, and draw the line (line segment) for Avy = Avn. Also, the setting line for M / LT mode can be drawn in the same procedure as for M mode. The above is the calculation method of the graphic display unit in the exposure function.

Next, the calculation of the graphic display unit when the multifunction is selected in the external display will be described. At this time, the index from -6 to +6 (hereinafter abbreviated as ΔEvx) indicating the range from the control is already decoded in step 108 in FIG. 108 so that the liquid crystal display (LCD) is turned on, and the shutter is released. Speed indicator (2
2), the index (23) indicating the aperture value is decoded so that it goes out. Ev values that are automatically controlled in Table 4 are Ev
c, Ev ₀ to Ev currently photometric point P ₀ in the current metering the stored number data in the 115 FIG step When n (△ Ev _0,
plot y ₀ ), then line L ₀ (step). Point Pn stored in step (△ Evn, ym)
Plot. However, 1≤n≤8, 2≤m≤9. This situation is shown in the flow chart in FIG. The above is the calculation method of the graphic display unit in the multi-function.

Next, the calculation of the graphic display portion when the bracket function is selected in the external display will be described. Index that indicates the amount of deviation from proper exposure -6 to +6
In the same manner as the multi-function, in the step shown in FIG. 108, is decoded so that the liquid crystal display (LCD) is turned on. In Table 4, if the current point is ΔEvCONT and the setting start point is ΔEvSET, then in step 116 in FIG.
And in steps, from △ Evx ＝ △ EvSET to △ Evx ＝ △ Evm
Draw a line (LSET) up to ax and in steps △ Evx ＝
Draw a line (LCONT) from △ EvCONT to △ Evx = △ Evmax. The above is the calculation method of the bracket function graphic display unit.

As described above, when the calculation of the graphic display section is completed, the process proceeds to the step shown in FIG. 108, and the symbol (20) indicating which function is selected in the external display.
Is decoded and is output to the LCD segment driver (SD) in step together with the decoding result in step and the calculation result in step. In steps,
Test the "IMP" flag indicating that imprinting is in progress, and if set, decode "IMP" into the subcharacters, and
Output to D segment driver (SD).

In this way, when all graphic display data is decoded and serially transferred to the LCD segment driver (SD), the liquid crystal display (LCD) is turned on (step), and the display microcomputer (DMC) process 1 End the loop. After that, the interrupt signal (C
When the interrupt signal (CSDM) is sent again, the display microcomputer (DMC) restarts the main routine, and from the above steps, the next graphic display process is started. That is why.

As described above, the graphic pattern is displayed on the liquid crystal display (LCD) according to the data sent from the control microcomputer (CMC) to the display microcomputer.

In the back circuit (BCKC) of FIG. 98, the calendar microcomputer is supplied with power from two 3-volt power supply batteries (B) and the control and display microcomputers (CMC) and (DMC) with four. Power is supplied from the 6-volt power supply battery (A). Then, the battery check is performed by the display microcomputer (DMC) (in the step of FIG. 108, the power supply batteries for both (A) and (B) are checked. As shown in Fig. 117, the symbol (A) and four batteries are displayed on the graphic display (24), and when the power source battery in (B) is useless, the symbols (B) and 2 are displayed as shown in Fig. 118. Two batteries are displayed.

The following describes how to draw a tilted line (Pv. 109, Avp) in P ₁ mode. The shutter speed value: aperture value = 1: 2
There are three possible ways (a), (b) and (c) as shown in FIG. That is, in the present embodiment, the minimum display step of the liquid crystal display unit (LCD) is 0.5Ev steps in both the shutter speed direction and the aperture direction. It can be displayed as shown in Fig. 119 (a) or (b). The difference between FIG. 119 (a) and FIG. 119 (b) is due to the way the shutter speed value and aperture value are rounded during display. If it is displayed in this way, the shutter speed value: aperture value inclination 1: 2 in P ₁ mode is extremely difficult to understand. Therefore, in this embodiment, the 119th
As shown in FIG. 7C, only the points for each 1 Ev step of the aperture value are displayed, and the points in between are not displayed. This reveals the slope of the aperture value with respect to the shutter speed value. For exactly the same reason, the display shown in FIG. 8 is also used in the P ₃ mode.

Next, how to draw the Ev line (25) will be explained. In this embodiment, the display range of the liquid crystal display (LCD) is set to
The speed value is Tv ≦ 11 and the aperture value is Av ≧ 0.5, but Tv ≦
Both at −0.5 and Av ≧ 9.5 It is not accurate because it represents in. So the Ev line is Tv
Not displayed when ≤-0.5 and Av ≥9.5 11 ≥ Tv ≥ 0, 0.5 ≤ A
It is displayed only in the range of v ≦ 9.5. However, the setting line (26) is displayed within the range of Tv ≦ 11 and Av ≧ 0.5. By doing this, the control point, which is the intersection of the setting line (26) and the Ev line (25), is the shutter speed value 11
Only the accurate range of ≧ Tv ≧ 0 and aperture value 0.5 ≦ Av ≦ 9.5 is displayed. Figure 120 shows how to draw the Ev line. In this figure, first, Tvx = 0 (1 sec) is initially set in step, and Avy = Ev−Tvx is obtained in step. However
Ev is an Ev value controlled automatically by data Nos. 14 to 15 in Table 2 and is a value sent from the control microcomputer (CMC).
In the step, it is judged whether 0.5 ≦ Avy <9.5 (1.2 ≦ F <27), and if it is within this range, the point (Tvx, Avy) is plotted (step), and if it is outside the range, it is not plotted. In the step, Tvx is incremented by 1Ev step, and in the step, Tvx> Tvmax (Tv = 11) is determined. If NO, the process returns to the step and the following steps are repeated. When YES, that is, Tv> Tvmax, the process proceeds to step and ends. The step of incrementing Tvx may be 0.5 Ev step.

In Fig. 1, the control microcomputer (BM) of the camera body (BD)
C) is connected to all the remaining circuits (flash device (FL). FL) through the serial input / output terminals (SOU), (SIN), (SCK).
Receiver (REC), display (DSP), lens circuit (LE
C), AF circuit (AFC), back circuit (BCKC), A-D, D-
Data is exchanged with the A conversion circuit (ADA). Therefore, by monitoring this serial input / output terminal while operating this system and checking the data read by monitoring and comparing it with the operation of the camera system, it can be determined whether the system is operating normally or not. You can check. Therefore, these serial input / output terminals (SOU), (SIN), (SC
K) is exposed from the camera body (BD) to the back circuit (BCKC) terminals (T ₁ ), (T ₂ ), (T ₃ ), and the lens circuit (LEC) terminals ( There are T ₁₁ ), (T ₁₂ ), and (T ₁₃ ). And it is the terminals (T1), (T2), (T3) for the back circuit (BCKC) that have all the terminals.
The checker should be installed at the position of the back circuit (BCKC). Then, the checker side outputs a "Low" signal having a lower impedance than the "High" signal output from the microcomputer (BMC) to the signal line (CSB),
If the signal line (CSB) is forcibly set to “Low”, the gate circuit (G ₂ ) will always be in the active state, so data exchange with circuits other than the back circuit (BCKC) can be checked.
Check the back circuit (BCKC) by checking the lens circuit (LE
It is possible to some extent with the terminals (T ₁₂ ) and (T ₁₃ ) for C).

Effect As described above, according to the present invention, the condition being set is displayed at the time of setting the condition at the time of bracket shooting, and the next shooting condition is always displayed during shooting. can get.

[Brief description of drawings]

FIG. 1 is a block diagram showing the whole camera system to which the present invention is applied, FIGS. 2 and 3 are flowcharts showing the operation of the microcomputer (BMC) of the camera body (BD), and FIGS. 4 and 5 are back views. (BCK) external view, FIGS. 6 to 8 are diagrams showing display examples on the display unit (2), and FIGS. 9 to 35 are diagrams showing relationship between key operation and display in exposure function, FIG.
36 to 54 are diagrams showing the relationship between key operation and display in the multi-function, and Figs. 55 to 68 are diagrams showing relationship between key operation in the bracket function and shooting operation and display, from Fig. 69. FIG. 88 is a diagram showing the relationship between key operations and displays in the imprint function, and FIGS. 89 to 97.
The figure shows the relationship between key operation and shooting operation in the interval function and the display. Figure 98 shows the back circuit (BCK
Fig. 99 to 104 are flowcharts showing the operation of the control microcomputer (CMC), Fig. 105 is a flowchart showing the operation of the calendar microcomputer (CAMC), and Figs. 106 to 108. Is a flow chart showing the operation of the display microcomputer (DMC), FIGS. 109 and 110 are diagrams showing the display method of the program line in P mode, and FIGS. 111 to 114 are S, A, M, M / LT. Fig. 115 shows the display method of the program line in the mode, Fig. 115 shows the display method with the multi-function, Fig. 116 shows the display method with the bracket function, Fig. 117, 118 show the power supply battery low FIG. 119 is a flowchart showing a display example at the time, and FIG. 119 is a flowchart showing a display method of the Ev line. BD: camera body, BCK: camera accessory, NO.25: data input means, NO.29: calculation means, NO.31: output means, NO.48:
Photograph number setting means, exposure compensation amount setting means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Nakai, 2-30 Azuchi-cho, Higashi-ku, Osaka, Osaka Prefecture Osaka Osaka Building Minolta Camera Co., Ltd. (72) Takanobu Tamaki, 2 Azuchi-cho, Higashi-ku, Osaka, Osaka 30-chome, Osaka International Building Minolta Camera Co., Ltd. (72) Inventor Nobuyuki Taniguchi 2-chome, Azuchi-cho, Higashi-ku, Osaka City, Osaka Prefecture Shuji Omoto Examiner, Minolta Camera Co., Ltd. (56) References Special Kai 54-139732 (JP, A)

Claims (1)

[Claims] 1. A number of shots setting means for manually setting the number of shots to be continuously shot, an exposure correction amount setting means for setting a value and a correction pitch as a setting reference for exposure correction by manual setting, and each time the setting is completed. Is operated and the bracket photographing setting device is informed of the completion of setting, the display means and the display means are controlled to set the number of shots set at the time of setting by the number of shots setting means and the setting by the exposure correction amount setting means. Sometimes the set correction pitch is displayed,
During shooting, the remaining number of shots and the exposure compensation amount for the next frame are displayed for each frame, and the number of shots set again and the exposure compensation amount for the first frame are displayed after the set number of shots have been taken A bracket photographing setting device for a camera having display control means for controlling the bracket photographing setting device.