JP2526539B2 - Camera exposure control device and exposure control adapter − - Google Patents

Description

Description: TECHNICAL FIELD The present invention performs exposure calculation on a camera body and controls exposure based on the exposure calculation, and also performs exposure calculation on an accessory or adapter such as a replaceable camera back cover. The present invention relates to a camera body side exposure control device and an exposure control adapter used in a system that controls the exposure of a camera body based on the result.

2. Description of the Related Art In recent years, an exposure control device of a camera body has a plurality of types of exposure control such as aperture priority automatic exposure time control (A mode), shutter speed priority automatic aperture control (S mode), and program automatic exposure control (P mode). There has been proposed and marketed a camera in which the exposure can be controlled by a mode so that a photographer can freely select and shoot a desired one. Furthermore, in recent years, it has been desired to mount a complicated exposure control function on a camera. By the way, there is a limit to the kinds of exposure control modes prepared for one camera, and a program line (S A method in which a plurality of program lines are set by setting means and a desired one of the program lines can be selected to perform photographing is disclosed in Japanese Patent Laid-Open No. 139732/54. It has been proposed in Kaisho 57-99623 and the like.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, in this conventionally proposed apparatus, only the data setting means is provided on the back cover so that the microcomputer provided in the camera body can cope with various settings. A program is available. For this reason, it is necessary to prepare a microcomputer having a large program capacity, which has a drawback that the camera body becomes expensive.
Further, even a user who does not want a plurality of types of program lines will have to buy a camera body having a plurality of exposure calculation functions. An apparatus or system similar to the above-mentioned conventionally proposed apparatus is disclosed in JP-A-51-64924 and JP-A-
4-28134, JP-A-52-58529, U.S. Pat. No. 4,165,929
Although it has been proposed in issues such as
It had few degrees of freedom. In addition, even when a complicated exposure control function is mounted on the camera, it is necessary to prepare a camera microcomputer with a large program capacity, which makes the camera expensive or requires such a complicated function. Users who do not need it will have to purchase such a camera.

An object of the present invention is to provide a camera system that does not have such inconvenience.

In the present invention, both the camera body and the exposure control adapter outside the camera body have an exposure calculation function, and when the calculation result is sent from the adapter, When there is no such transmission, the exposure is controlled based on the result calculated by the camera body.

First Embodiment FIG. 1 is a block diagram showing the whole camera system to which the present invention is applied. The camera body is surrounded by a broken line (BD), and is electrically connected to the camera body (BD) through the terminal (T ₁ ).
(BCKC) connected via (T ₉ ) is a circuit that has a data imprinting function, an interval shooting function, and a calculation function for exposure control of the camera body (BD), and this circuit is provided on the camera back cover. This circuit (BCKC) is hereinafter referred to as a back circuit. The camera back cover provided with the back circuit (BCKC) is called a back (BCK). This back (BC
K) is designed to be detachably attached to the camera body (BD), and the camera body has a back cover with a circuit having only the data imprinting function and the interval shooting function, and the above-mentioned functions. You can also attach a back cover that does not have a circuit that you have instead of this back (BCK). The configuration and function of the back (BCK) and the 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. When the charging is completed and the switch (S ₄ ) is turned “OFF”, the motor drive (MD
The rotation of the motor in R) stops. The motor drive (MDR) is mounted on the bottom of the camera body via a connecting mechanism. When the motor drive is not mounted, charging of the exposure control mechanism and film winding are performed by a manual winding lever. The motor drive (MDR) may be provided in the camera body (BD).

Camera body (BD) and the terminal _{(T 11), (T 12} ), (T 13)
The circuit (LEC) connected by is a data output circuit provided in the 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
There are data for confirming the attachment 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 disclosed in, for example, JP-A-59-84228 and JP-A-59-14040.
It is omitted because it is described in No. 8.

(MET) is an exposure meter (hereinafter referred to as a meter), and the circuit (REC) connected to the camera body (BD) with terminals (T ₁₄ ), (T ₁₅ ), (T ₁₆ ) is a meter (MET). It is a receiver that receives the infrared light signal sent. Also, the receiver (REC) and the terminal (T _17), a _{(T 18), (T 19} ) and the connected circuit (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).
The connection state shown in the figure is obtained. It should be noted that only the receiver (REC) may be attached to the hot shoe of the camera body (BD), or only the flash device (FL) may be attached. In addition, the signal line (ST ₁ ), (ST ₂ , (ST ₃ )) is provided with a terminal that exposes other parts of the camera body (BD) other than the hot shoe (for example, the bottom of the camera), and the flash device is attached to the hot shoe. One of the (FL) and the receiver (REC) may be directly attached, and the other of the flash unit (FL) and the receiver (REC) may be attached to the other portion via an adapter.

The meter (MET) can be used as an incident light type or a reflected light type, and can also measure stationary light and flash light. Exposure control data is calculated based on the measured values, and this data is emitted as serial light data by the infrared light projecting means. In addition to this, as the data to be ejected, there is data indicating whether or not the flash unit (FL) is caused to emit a test light, and whether or not data for control is sent from the meter (MET). The infrared data sent from the meter (MET) is read by the receiver (REC) and latched as an electrical signal.

Next, the functions of the flash device (FL) and the receiver (REC) related to the signal lines (ST ₁ ), (ST ₂ ), and (ST ₃ ) will be described together with the function of the camera body (BD). First,
The terminal (ST ₁ ) is a terminal for transmitting a light emission start signal. When the X contact (SX) in the camera body (BD) is closed when the front curtain (1C) has finished traveling, the flash device (FL) The light emission starts. When the receiver (REC) receives a test flash signal from the meter (MET), the receiver (REC) pulls down this terminal (ST ₁ ) to "Low" to start flash device flashing. Signal line (ST ₂ ) is the camera body (BD)
For data transmission from the flash unit (FL) to the flash unit (FL), the flash unit (FL), the receiver (REC) to the camera body (B)
A data signal from the flash device (FL) indicating that the flash device (FL) has started to emit light when the X contact (SX) is closed and the flash device (FL) is started. BD) and has the function of transmitting.

The signal line (ST ₃ ) is used to input data from the flash unit (FL) and receiver (REC) to the camera unit (BD), and to connect the flash unit (F) to the camera unit (BD).
The mode of outputting data to L) and the start of the exposure control operation of the camera body (BD) are transmitted from the camera body (BD) to the flash unit (FL) and receiver (REC) with pulses of different time widths. Function, and the function of transmitting the synchronization clock pulse for data transfer from the camera body (BD) to the flash unit (FL) and receiver (REC),
Further, the flash device (FL) has a function of transmitting a light emission stop signal from the camera body (BD) to the flash device (FL).

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

First, the flash unit (FL) 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 includes 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. . 2nd byte, 3
The 4th and 4th bytes are output from the receiver (REC), and this data is also input to the data input terminal (S
IN). The data in the second byte is a signal indicating whether or not exposure control data is sent from the meter (MET), a test light emission signal, and the like. The third byte is exposure time data from the meter (MET), and the fourth byte is 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), set the signal line (CSF) to “Low”,
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 reads 3 bytes of data from the data output terminal (SOV) of the microcomputer (BMC) based on the synchronizing clock pulse from the camera body (BD). The first byte of the 3-byte data is the control aperture value (Av), the exposure control mode,
The byte indicates data (Sv + Cv) obtained by adding the film sensitivity and the exposure correction data, and the third byte indicates the focal length (fv) of the interchangeable lens. The first byte and the second byte are used for calculating and displaying the photographing distance range in which the proper exposure is compensated by flash emission, and the third byte data is used to change the irradiation range of the flash unit (FL). This is data for adapting to the shooting angle of view.

When the camera body (BD) starts the exposure control operation,
Signal line (CSF) is set to "Low", and signal line (FMO)
The pulse of the third time width is output to. Then, the pulse is read from the signal line (ST ₃ ) by the flash device (FL), and the flash device (FL) is set to 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 a signal to the flash emission control circuit (FLM) from the signal line (ST ₂ ). Signal line (FS
T) is applied to the signal line (ST ₂ ) via the signal line (FST), and the signal input from the circuit (FLM) via the line (FSP) is output to the signal line (ST ₃ ). The signal line (ST ₂ ) outputs a “Low” signal until the flash device (FL) starts to emit light, and the flash device (F 2)
When the light emission of L) starts, it changes to "High". 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. The signal lines (ST ₂ ) and (FST) change from "High" to " Low "
When it changes to, integration of the output current of this light receiving element starts. Then, the integrated value is input from the AD, DA conversion circuit (ADA), the film sensitivity (Sv) and the exposure correction amount (Cv).
When the value corresponding to the analog signal of the data Sv + Cv by is reached, a "High" pulse is output to the signal line (FSP),
This pulse is input to the flash unit (FL) via the signal line (ST ₃ ) to stop flash emission.

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 boost operation is performed for a certain time 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. And the flash unit (F
Data is exchanged with L) and the boost operation is performed. Therefore, even in interval shooting by flash shooting having 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), flash emission control circuit (FLM) are, for example, Japanese Patent Application No.
-It is omitted because it is described in 201381. Specific examples of the flash device (FL), the interface circuit (IF), and the flash emission control circuit (FLM) are described in Japanese Unexamined Patent Publication No.
No. 9-231520 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 directly from this battery (BA) through the power supply line (+ E) to a circuit excluding the photometry circuit (FLM), (AM) AD, and DA conversion circuit (ADA). Power is being supplied. Transistor (B
T) is controlled by the signal from the output port (OP _o ) 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 (SOV) to the terminal (SC
The serial data sent in synchronization with the clock pulse from K) is read, and a display based on this data is performed.

(AMM) is a photometry circuit for stationary light, and has a light receiving element for partial photometry and average photometry, which is switched by "High" and "Low" from a 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 photometry circuit (AMM) to the terminal (CKOVT) of the microcomputer (BMC) when a "Low" pulse is output to the signal line (ADSTA).
A / D conversion is performed based on the clock pulse from When the signal line (CSA) is "Low" and (ADMO) is "High", the A / D converted data is sent to the data input terminal of the microcomputer (BMC) in synchronization with the clock pulse from the terminal (SCK). , When the signal line (CSA) is "Low" and (ADMO) is "Low", the data Sv + Cv from the output terminal (SOV) is read, the data is D-A converted and the light emission 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 "Hig
When it reaches h ", the operation stops. Also, the signal line (CSAF)
When is “Low”, the automatic focus adjustment data from the microcomputer (BMC) is read. A specific example of the automatic focus adjustment circuit (AFC) is disclosed in, for example, JP-A-59-140408, and will not be described in detail.

(APG) is a means for outputting a pulse in response to the movement of the aperture member of the aperture.
Input to pin (CKIN) of C). This pin (CKIN)
Is input to an event counter in the microcomputer (BMC), and is subtracted from preset data of the number of steps based on this pulse. Then, it will be narrowed down to the planned narrowing number of stages the contents of the counter becomes "0", it takes counter interrupt, the output pulse for narrowing down stop from the output port (OP ₁₂₎ down operation is stopped.

(MGD) is a magnet circuit, and the signal line (RL)
When the "ow" 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 lock release magnet operates and the trailing curtain starts running. (G ₂ ) is a gate circuit, which becomes active when the signal line (CSB) becomes “Low”, and the back circuit (BCKC) and 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 data is transferred to and from the back circuit (BCKC) in the operating state, the back circuit (BCKC) is also activated.
In addition, the signal line (CSB) outputs a "Low" pulse when the trailing curtain starts running to prevent film winding when data is imprinted in the back circuit (BCKC). It is designed to output. When this pulse is input, the back circuit (BCKC) stops the imprinting operation for a time corresponding to the film sensitivity data sent from the camera body (BD). Signal line (BIO) is "H"
When "igh", the back circuit (BCK
C), and when it is low, the back circuit (BCK
Send data from C) to the camera body (BD). The signal line (IP) outputs a pulse for imprinting data. This pulse is output from the start of the exposure control operation, 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. A signal line (BS ₁ ) is input from the back circuit (BCKC) in parallel with the switch (S ₁ ), and the microcomputer (BMC) can be started from the back circuit (BCKC). The start signal is input from the back circuit (BCKC) via the signal line (BS ₁ ) when the back circuit (BCKC) is operated and the back circuit (BCKC) operates, and as described above, the interval is There are two types: a case where the camera body is activated to start boosting the flash device (FL) one minute before the start of the shooting operation in shooting. The switch (S ₂ ) is a release switch that is closed at the second stage of pressing down the release button. When the switch (S ₂ ) is closed, an exposure control operation is started. Also, the signal line (BS ₂ ) from the back circuit (BCKC) is connected in parallel with the switch (S ₂ ), and the back circuit (BCKC) shifts the interval exposure by a fixed exposure value for proper exposure. When a predetermined number of shots (hereinafter referred to as bracket shooting) are performed, a signal for starting a shooting operation is transmitted to the camera body (BD). Further, when a predetermined number of frames (hereinafter referred to as the number of frames) have been shot during bracket shooting, even if the release switch (S ₂ ) of the camera body (BD) is "ON", the transition to the exposure control operation is performed by the back circuit. It is prohibited from the (BCKC) side, and when the release switch (S ₂ ) of the camera body (BD) is turned "OFF", it is possible to shift to the next bracket shooting. Therefore, back circuit (BCKC) watches the state of the camera release switch body (BD) (S _2), a release switch after photographing by the number set frame by a bracket shooting has ended (S ₂₎ is turned "ON" If so, data for prohibiting shifting to the exposure control operation is sent from the back circuit (BCKC) to the camera body (BD). The back circuit (BC
KC) can set the shooting start time, the number of frames, and how many time intervals (hereinafter, referred to as the number of groups) the shooting for this number of frames is performed. Then, when the start time comes from the back circuit (BCKC), a "Low" signal is output to the signal line (BS ₂ ) to perform the exposure control operation until shooting for the number of frames is performed. Then, when the shooting of one group is completed, set the signal line (BS ₂ ) to “H
When the remaining time reaches 0 seconds, the signal line (BS ₂ ) is again set to “Low” and the image capturing is performed for the number of frames. When the above operation is completed, the set interval shooting mode is released .. Even if the back circuit (BCKC) is operating in interval shooting mode, the release switch (S ₂ ) on the camera body (BD) If the shutter is closed, the set start time and time interval will be ignored and the shooting operation will be performed, that is, the release switch (S ₂ ) will be turned on even if the start time has not been reached. When the shooting operation starts, the back circuit (BCKC) keeps the signal line (BS
₂ ) is set to “Low”. 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 include program exposure (P mode), exposure time priority aperture automatic control (S mode), aperture priority exposure time self control (A mode), exposure time, aperture manual setting mode (M mode). This mode is 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", 1/3 Ev
When the film sensitivity changes in the step, and the switch (SIS) changes from “OFF” to “ON” after reaching the upper limit, it changes to the lower limit, and when the switch changes from “OFF” to “ON” again. It will increase again. (SOR) is a switch for setting the exposure compensation amount. This switch (SOR) changes from “OFF” to “O”.
Every time it changes to N ", 0 → 1/2 → 1 → 11/2 → 2 → 21/2 → 3
→ 31/2 → 4 → -4 → −31 / 2 → -3 → −21 / 2 → -2 → -11
It changes in the order of / 2 → -1 → −1 / 2 → 0. (ST) is a switch for setting the exposure time. Each time the switch (ST) changes from “OFF” to “ON”, the exposure time changes in steps of 1 Ev to the shorter exposure time. And in S mode, 32
sec → 16sec → 8sec → …… → 1 / 1000sec → 1 / 2000sec → 1/40
It changes like 00sec → 32sec → ……, and in M mode, it changes like 32sec → 16sec → …… → 1 / 2000sec → 1 / 4000sec → valve → 32sec → ……. Therefore, M
In the mode, the valve mode can be set by operating the switch (ST). The switch (SA) is a switch to set the aperture value. When this switch (SA) changes from “OFF” to “ON”, the mode is A, M mode and the maximum aperture from the open aperture value in 1 / 2Ev steps Vary towards value.
Then, when the maximum aperture value is reached, the aperture value then changes to an open aperture value. Switch (SMO), (SIS), (SOR), (S
T) and (SA) are switches that are closed by operating the operation keys provided outside the camera. Also, switches (S ₁ ), (S ₂ ), (SMO), (SIS), (SOR), (S
A) are microcomputers (BMC) via AND circuits (AN)
It is connected to the interrupt terminal (INT) of, so when the data setting key provided outside the camera is operated,
When the release button is operated, "Lo" is further sent from the back circuit (BCKC) via the signal lines (BS ₁ ) and (BS ₂ ).
When the signal "w" is input, if the microcomputer (BMC) is in the operation stop state, the microcomputer (BMC) receives this interrupt signal and starts operation. The switch (SCN) is linked to the mechanical film counter. This switch (SCN) is "ON" until the film counter reaches the position where the number of frames is "1", and "O" from the position of "1".
The signal from this switch (SCN) is input to the back circuit (BCKC) via the input port (IP ₇ ) of the microcomputer (BMC) and the terminal (T ₇ ). Microcomputer (BMC) Controls the exposure with the shortest exposure time and maximum aperture value while the switch (SCN) is "ON", while the back circuit (BCKC) uses the signal line (IP) while the switch (SCN) is "ON". The data imprinting operation is not performed even if a pulse signal is input.
In addition, the back circuit (BCKC) has the function of adding or subtracting "1" for each pulse from the signal line (IP) that is input each time shooting is performed from the set value, and copying this data. 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) checks the state of the switch (SCN) and imprints data. It is not necessary to determine whether or not to perform addition / subtraction, and the terminal (T ₉ ) is not required. Also, use an electric film counter instead of a mechanical film counter. Until the film reaches the regular shooting frame position (counter display is "1"),
A “Low” signal may be output to the terminal (T ₉ ), and further, 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 photometry mode switching member attached to the external part of the camera. This signal is input to the input port (I
Have entered into P _8), 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 enter the partial metering mode, and causes the display unit (DSP) to display the partial metering mode. On the other hand, if a “High” signal is input to the input port (IP ₈ ), a “High” signal is output to the signal line (ASMO) to set the average metering mode, and the average metering to the display (DSP). Send data indicating mode. Switch (S ₄₎
Is “ON” when the exposure control mechanism ends the exposure control operation, and “OFF” when the exposure control mechanism ends the shutter charge operation.
On switches, signals from the switch (S ₄₎ are input to the input port of the microcomputer (BMC) (IP _9). The microcomputer (BMC) does not shift to the exposure control operation even if the release switch (S ₂ ) is turned “ON” when a “Low” signal is input from this switch (S ₄ ).

The microcomputer (BMC) outputs a pulse of a time width corresponding to the film sensitivity to the signal line (IP), but the back circuit (BCKC) shown in Fig. 1 is output 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 for starting the printing 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 provided may be attached to the camera body (BD), 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. For this reason, the microcomputer (BMC) always sets the exposure time and aperture value to the back circuit (BCK) before entering the exposure control flow and outputting a pulse to the signal line (IP).
C). Therefore, the back circuit (BCKC) controls the exposure of the camera (BD) from the camera body (BD) in order to reduce the probability that the rear curtain starts and stops imprinting data before the proper time is reached. When an operation for sending the time and the aperture value is detected, a printing operation is started.

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 ),
Whether any of (S ₂ ) (SMO), (SIS), (SOR), (ST), (SA) turns "ON", and 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". Get down. Then, the microcomputer (BMC), which has stopped operating, starts the operation from step # 1. First, in step # 0, a "Low" pulse is output to the signal line (CSB) to activate the back circuit (BCKC), and in step # 1, the transistor (BT) is turned "ON" to perform photometry. Circuit (FLM), (AM
M), AD, DA conversion circuit (ADA), lens circuit (LEC)
To start power supply to. Then, in the step of # 2, a "Low" signal is input to the input port (IP ₁ ) and the switch (S ₂ ) is turned on, or the release from the signal line (BS ₂ ) of the back circuit (BCKC). Determine whether a signal is input. Then, if a "Low" signal is input to the input port (IP ₁ ), the process proceeds to step # 3. In step # 3, it is determined whether the switch (S ₄ ) is "OFF" and the exposure control mechanism is completely charged.
If it is not F ", the exposure control operation cannot be started.
Go to step 10. On the other hand, the switch (S ₄ ) turns “OF”.
If it is "F", then in step # 4 the flag RLEF
Determine whether is "1". This flag RLEF is ready for exposure control data (Tv, Av), and back circuit (BCKC)
If the release prohibition signal is not input from, it is set to "1" and the data is not ready, or the release prohibition signal (input at the end of bracket shooting) is input from the back circuit (BCKC). It is reset to “0”. # 4
If the flag RLEF is "1" in the step of #, the flow moves to the exposure control operation starting from step # 110, and if the flag RLEF is "0", the flow moves to step # 10. Also,
If the "Low" signal is not input to the input port (IP ₁ ) in step # 2, the process proceeds to step # 10.

In step # 10, it is determined whether or not a “Low” signal is input to the input port (IP ₀ ). If so, the flag S ₁ F is set to “1”. The process proceeds to step # 12 while S ₁ F remains “0”. 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, the signal line (CSL) is set to "Low" and the series input / output operation is repeated multiple times.
Various data are read from the lens circuit (LEC), and then in step # 14, the output of an AD conversion clock is started from the clock output terminal (CKOUT), and the signal line (AD
STA) to output a "Low" pulse to start the operation of AD-converting the output of the photometric circuit (AMM) by the AD and DA converter (ADA).

Next, in the step # 20, it is determined whether or not the flag S ₁ F is set to “1” in the step # 11. If the flag S ₁ F is set, the process proceeds to the step # 21. Move to step. The fact that the flag S ₁ F is not set means that the switch (S ₁ ) and the buck circuit (BCK
It that this is not a work by C) a signal line (BS _1), In this case, in order to prohibit the photographing lens by automatic focusing operation is inadvertently moved, the signal line (AFEN) "High And then flag S in step # 25
₁ Reset F to “0” (in this case, it is already reset to “0”) and proceed to the step of # 26. on the other hand,#
If the flag S ₁ F is “1” in step 20, it is next 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) In order to activate, the signal line (BS ₁ ) outputs a "Low" pulse. By the way, the back circuit (BCK
When the camera body (BD) is activated by C), it is not desirable that the lens is inadvertently moved by the automatic focus adjustment operation. Therefore, the back circuit (BCKC)
When starting the camera body (BD), the microcomputer (BM
Output a “Low” pulse to the signal line (BS ₁ ) that is shorter than the time from the input of the interrupt signal to C) to the step of # 21 and longer than the time to the step of # 10. There is. So, in step # 21, input port (IP ₀ )
The signal line (BS ₁ ) no longer outputs the “Low” signal when it is determined whether or not is “Low”. Therefore, in this case, the signal line (AFEN) is set to "High" in step # 24 so that the automatic focus adjustment operation cannot be performed, and the process proceeds to step # 26 via step # 25. Meanwhile, input port (IP ₀ ) in step # 21
When it is determined that is "Low", this is the case when the metering switch (S ₁ ) is "ON". At this time, set the signal line (AFEN) to "Low" and set the auto focus. Operate the adjustment circuit (AFC) and set the signal line (CSAF) to "Low"
To send the data for automatic focus adjustment, and to send the signal line (CSA
F) back to "High", then in step # 25, flag S ₁
Reset F to "0" and move to step # 26.

In step # 26, data is read from the flash device (FL) and the receiver (REC). This operation makes the signal line (CSF) "Low" as described above.
The pulse of the first time width is output to the signal line (FMO). Then, when serial input / output operation is performed, first the above-mentioned 1st byte data from the flash device (FL), then the 2nd byte and 3rd byte of the above-mentioned data read from the receiver (REC) from the meter (MET). Data is output in the order of the first and fourth bytes, and this data is read. Then, the signal line (CSF) is set to "High" to end the operation of step # 26.

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 # 34, it is determined whether or not the switch (SCN) is "ON". If the switch (SCN) is "OFF", the process proceeds to the step # 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 desired setting for the film sensitivity and exposure correction amount data cannot be accepted. Even if 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 BCK is "1". For this flag BCK, the back circuit (BCKC) calculates the exposure control data, and this data is calculated by the camera body (BD).
To the camera body (BD) to perform exposure control based on this data (hereinafter referred to as back IC
(Indicated by P) is set to “1” when read, and reset to “0” otherwise. Therefore, at the time of the first operation, it is always reset to “0”.
Move on to step 41. On the other hand, when the exposure control is performed based on the data from the back (BCKF = 1) #
The operation immediately proceeds to step # 51 without performing the data change step operations of 43 to # 48. Therefore, the switch (SM
Data is not changed even if O), (ST), and (SA) are operated.

In step # 41, the mode switch (SMO) is “OFF”
It is determined whether or not the exposure control mode has been changed to "ON". When the change is determined, the exposure control mode is changed. On the other hand, the switch (SM
If O) remains "OFF" or "ON", the exposure control mode is left as it is, and the process proceeds to step # 43. # 43
In the step (3), it is determined whether or not the camera is in the S, M mode. In the S, M mode, a change in the exposure time is accepted, so that the flow proceeds to the 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 if conversion 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 described above, after the shortest exposure time (1/4000 sec), the switch (S
When T) changes from "OFF" to "ON", it changes to the longest exposure time (32 sec) in the S mode, and changes to a valve in the M mode. In the step # 46, it is determined whether the mode is the A or M mode. If the mode is not the A or M mode, the setting of the aperture value is not accepted, so the process directly proceeds to the step # 50. Determines the change of the switch (SA). Then, if there is no change, the process directly proceeds to step # 50, and when the change from "OFF" to "ON" is discriminated, the aperture value is increased by 1/2 Ev and the process proceeds to the next step # 50. In addition, the "OF" of the switches of # 30, # 32, # 41, 44, 47
The change from F "to" ON "is detected in each step by storing the state of the switch at that time and the signal that remembers the state of the switch at the next step and the previous state. Can be detected by comparing

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 output of the clock from the clock output terminal (CKOVT) is stopped and the process proceeds to step # 51. And # 51
In the step of #, it is determined whether the flag BCKF is "1" and if it is "1", # 52, 53, 54 are skipped without taking the steps
Move to step 55. On the other hand, if the flag BCKF is "0", the flow shifts to step # 52 to determine whether or not a charge completion signal is input from the flash device (FL). If the charge completion signal has been input, exposure calculation for flash photography is performed in step # 53, and if the charge completion signal has not been input, exposure calculation for steady 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 described in, for example, JP-A-59-111132 and JP-A-59-140408.
It is omitted because it is shown in the numbers.

In step # 55, an operation of transferring data to the back circuit (BCKC) is performed while the signal line (CSB) is set to "Low" and the signal line (BIO) is maintained at "High". The following data is sent from the camera body (BD). First, the first byte is data sent from the flash device, the second, third, and fourth bytes are data from the meter (MET) read from the receiver (REC). When the back circuit (BCKC) determines that the exposure control data from the meter (MET) has been input, the back circuit (BCKC) performs display based on the data and sends the 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 annual long time (M / LT) mode)
Even if is selected, it becomes an external function, and performs exposure control based on data from the meter (MET).
When the exposure function is in the active state, a function for storing a plurality of photometric values from the camera can be in the active state (hereinafter, this is called a multi-function). In this function, the average value of multiple stored photometric values (Average mode), a mode to calculate the intermediate value ((Bvmax + Bvmin) / 2) between the maximum and minimum values of the stored photometric value (hereinafter referred to as the center mode), and a value (Bvmax) for reproducing the maximum value to the upper limit of the film latitude. -2.3) (highlight mode), and a mode (shadow mode) for finding a value (Bvmin + 2.7) that reproduces the minimum value at the lower limit of the latitude. Even if such a multi-function is in an active state, if exposure control data is input from a meter (MET), it becomes an external function and the multi-function becomes invalid. Further, when the exposure function is in the active state, a function for performing bracket shooting (bracket function) can also be in the active state. At this time, when 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).

The fifth byte of data sent from the camera body (BD) to the back circuit (BCKC) is the photometric data (Bv-Av ₀ ) (Av ₀ ; open aperture value) read from the AD / DA conversion circuit (ADA). ), The 6th byte is the maximum aperture value data (Av ₀ ) read from the lens circuit (LEC), and the 7th byte is the maximum aperture value data (Avmax). 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 synchronization limit exposure time data (Tvx), the 11th byte is the exposure time data (Tv) obtained from the camera body (BD), and the 12th byte is the aperture value data obtained from the camera body (Av). The 13th byte contains the film speed (Sv), and the 14th byte contains the exposure compensation amount (Cv). When the above data transfer is completed, the microcomputer (BMC) of the camera body (BD) proceeds to step # 56, and sets the signal line (BIO) to “Low”. Then, 1-byte data is sent from the back circuit (BCKC). This data is the aforementioned back ICP. Back circuit (BCK
If the exposure function is selected in C), for example, “8
If the exposure function is not selected, the back circuit (BCKC) does not perform the output operation of this data and the camera body (BD) outputs “00H” (H indicates hexadecimal).
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 a photometric value based on the transmitted data. During this time, the signal line (CSB) is still ringing "Low". This is (Bv-Av ₀ ) unless the multifunction is selected.
It only calculates + Av ₀ = Bv, but when Multi-function is selected, it calculates according to the mode selected from the average mode, center mode, highlight mode, and shadow mode. . In addition, in the case of the multi-function, unless the storage operation (pressing of the memory key) is performed, every time the photometry data from the camera body (BD) is updated, the exposure calculation based on the 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 photometric data thus obtained is subjected to exposure calculation according to the set exposure mode to calculate control data. This operation is
As a program mode, P ₁ mode is Bv ＋ Sv ＝ Ev 2: 1
A program mode with a tilt of 2/3 that divides the aperture value and exposure time according to the ratio of (Av = 2/3 · Ev, Tv = 1/3 · E
v), P ₂ mode with 1/2 tilt (Av = 1/2 · Ev, T
v = 1/2 · Ev) , P 3 modes inclination 2/3 program (Av = 1
There are three types: / 3 ・ Ev, Tv = 2/3 ・ Ev). In S mode, from Tv set in the back circuit (BCKC) to Ev-Tv = Av
In the A mode, Ev−Av = Tv is calculated from the set Av, and in the M mode, the set Av and Tv are calculated as control values. If the calculated Av is Av> Avmax, E
If V-Avmax = Tv and Av <Av ₀ , EV-Av ₀ = Tv is calculated and Tv and Avmax or Tv and Av ₀ are used as calculated values. Similarly, when Tv <Tvmin, Tvmin and EV-Tvmin = Av
When> Tvmax, Tvmax and EV-Tvmax = Av are calculated values. In the P ₁ , P ₂ and P ₃ modes, Av ₀ <Av ₁ , Av
Limit the aperture with manually set Av ₁ and Av _{2 such} that ₂ <Avmax.

In the M / LT mode, it is possible to set an exposure time longer than the longest exposure time (Tvmin) that can be set in 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 “L”.
ow "to prevent the trailing curtain from running, and when the count ends (BS ₂ ) is set to" High "to run the trailing curtain. If multi-function is not selected, send the data for setting time display instead of the data.If the multi-function is not selected, the vertical axis is the vertical axis and the horizontal axis is the exposure time. Is displayed graphically on the screen, and when Multi-function is selected,
Each stored value and the current value based on the exposure control value are displayed graphically.

When the bracket function is selected, a control value is calculated by shifting the set deviation amount by the number of frames at that time based on the calculated control value. 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.

When it is determined that the charge completion signal is included in the data from the flash device input via the camera body, the back circuit does not perform the above-described calculation display and the camera body (BD) ) Is displayed, and the data is used as control data. This is because the calculation (step # 53) for flash photography on the camera body side has a considerable function as shown in, for example, JP-A-59-140408 and JP-A-59-111132. This is because the back circuit (BCKC) side does not need to particularly perform the calculation for flash photography. For example, in order to support a camera body that does not have the above-described flash photography function, the same operation as in step # 53 is performed on the back circuit side. If the function is selected, the flash function may be automatically selected, an operation may be performed according to the set exposure mode at that time, and control data may be sent to the camera body. Furthermore, a multi-function, a calculation combining the bracket function and the flash function may be prepared, and the calculation result may be sent to the camera body (BD).

When enough time has passed to complete the above calculation, the microcomputer (BMC) moves to step # 62,
Set the signal line (BIO) to "Low", perform serial input / output operation, and read data from the back circuit (BCKC). In this data, the first byte is the control exposure time data (M / LT
The second byte is the control and display aperture value data, and the third byte is the display exposure time data (M /
(Exposure time set in LT mode), 4th byte is back exposure mode (P ₁ , P ₂ , P ₃ is P mode, M, M / LT mode is M mode, external function is metering mode),
There are 1- and 2-byte control data that indicates that Ev is data that is limited to the limit value because Ev is out of control interlocking, and data that indicates whether exposure control operation is prohibited (release prohibition data). When the 4-byte data is read, the microcomputer sets the signal lines (CSB) and (BIO) to "Hi
gh ", set the read Tv and Av as control data in step # 63. Then, determine whether the release prohibition data is read, and if read, set the flag RLEF to" 1 ", Flag if not read
Reset RLEF to "0" and move to step # 70.

In step # 70, the exposure mode is displayed according to the data of the read mode (M mode in the 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, a warning display is performed, and if not read, no warning display is performed, and the process proceeds to step # 74. In step # 74, whether the metering mode is the metering mode or the partial metering mode is displayed on the camera body (BD). In step # 75, the control exposure time and the 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.
An indication as to whether or not to perform flash photography based on the data sent from the flash unit (FL) is displayed. 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 this pulse is read by the flash unit (FL), the data is ready to be read. And microcomputer (BMC)
First, the first byte is the control aperture value and exposure control mode, 2
The 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 (fv) of the interchangeable lens. The usage of 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 even one is closed, the timer is reset and started, the process returns to step # 2, and the above-described operation 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 completed, the process returns to step # 2. On the other hand, when 10 seconds have elapsed since all the switches are turned "OFF", the flow proceeds to step # 85. Then, in step # 85, it is possible to interrupt the interrupt pin (INT) and set the flags RLEF and BCKF to "0".
Then, 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 BCK 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 determines whether the data is read by the camera body (BD). If it is read, the process proceeds to step # 91. If it is not read, the process proceeds to step # 100. In step # 91,
For the aperture value, limit the data from the read meter (MET) within the range of the maximum aperture value and the maximum aperture value, and for the exposure time, use the flash photography within the range of the shortest and the longest exposure time for continuous light shooting. If so, limit it to the tuning limit and the range of the longest exposure. Then, the data from the meter (MET) obtained in this way is set as a control value, and the M mode is set as the exposure control mode and the meter photometry mode is set as the photometry mode, and the process proceeds to step # 105. 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 setting the narrowing stages (Av-Av _0). In the step # 101, the exposure control mode of the camera body (BD) is displayed, the photometry mode is displayed, and the process proceeds to the step # 105. When the control data is limited to the interlocking limit data, the warning display is set to “ON”. When the control data is not limited, the warning display is set to “OFF”.
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”, the exposure control operation from step # 110 in FIG. 3 is performed. First # 1
In step 10, the signal line (AFE) 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)
To "High" again. When the flash unit (FL) determines that the pulse having the third time width has been input, the flash mode is set to a photographing light emission mode. Next, set the signal line (CSB) to "Lo
The control exposure time data and aperture value data are sent to the back circuit (BCKC) as w ".
Used as data for imprinting in C),
When this data is input, the back circuit starts the data imprinting operation if the imprinting function is selected. Among the imprint functions, control data mode, year / month / day mode, month / day / year mode, day / month / year mode, month / day / hour / mode, day / hour / minute / mode, hour・ There are minute / second mode, count up mode, count down mode, and fixed data mode. In the control data mode, the control data calculated by the back circuit (BCKC) (only when the exposure function is selected) or the control data sent from the camera body (BD) in step # 112 is imprinted. Year / month / day mode, month / day / year mode, day / month / year mode, month / day / hour mode, day / hour / minute mode, hour / minute / second mode are back circuits (BCK).
The data of the mode name from the circuit for calendar in C) is imprinted in order of the mode name. In the count-up mode and the count-down mode, a value obtained by adding or subtracting “1” from a preset fixed value for each photographing is printed. In the fixed data mode, a preset numerical value is imprinted.

In step # 113, the microcomputer (BMC) next sets the signal lines (CSA) and (ADMO) to "Low", and converts the film sensitivity and exposure correction amount conversion data (Sv + Cv) into an 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, interruption by the timer is enabled, and counting of the timer is started. Then, in step # 120, the count 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, there is enough time for the mirror up operation to be completed. During this time, a 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 every time a 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.
After a lapse of a predetermined time in step 122, the process proceeds to step # 123, in which counter interruption is disabled, and the process proceeds to step # 125.

In step # 125, it is determined whether the control exposure time data is a valve. And if not a valve # 126
Go to step.

In step # 126, a "Low" pulse is output to the signal line (IC) to operate the front curtain magnet to start the front curtain running. Next, the exposure time is counted, and when the count is finished, a "Low" pulse is output to the signal line (2C) to activate the trailing curtain magnet to start the trailing curtain and move to step # 135. . If it is determined in step # 125 that the valve is set, the process proceeds to step # 130, and the front curtain is driven. And the input port (I
Wait for the input signal to P 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, the back circuit (BCKC) is installed, and M / LT
When 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 ) is set to “Low”.
Then, when the count of the back circuit (BCKC) ends,
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, the exposure time starts counting with the signal input from the camera body (BD) via the signal line (IP), not at the start of the first curtain, and 1 sec. Since the exposure time is controlled as the minimum unit, the exposure time is not precisely controlled, but since the overall exposure time is long, the error does not affect the exposure so much.

Normally, the counting of the timer corresponding to the film sensitivity has been completed before the step of # 135, and when the counting of the timer is completed, the timer is interrupted and # 145 is performed.
In step, the signal line (IP) is set to "High" to stop the imprinting operation, enable the count interrupt, and return 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, an operation of setting the signal line (IP) to "High" is performed to forcibly stop the imprinting operation (to prevent imprinting during winding). In step # 136, the signal line (CSC) is used to stop the imprint operation by the back circuit (BCKC).
A low-level pulse having a fixed time width is sent to B), and the back circuit (BCKC) stops the imprinting operation when this pulse is input from the signal line (CSB). Then, the counter and the timer interrupt are not accepted, and it waits for the trailing curtain to be completed and the switch (S ₄ ) to be turned “ON”. And
When the switch (S ₄₎ is "ON", the flag RLEF, the BCKF to "0", the process returns to # 2 step, performing the above-described operation.

Interval function with back circuit (BCKC)
When the continuous shooting mode such as bracket function is selected, the "Low" signal remains input from the signal line (BS ₂ ), and the above exposure control preparation operation is being performed even during the winding operation. , The next exposure control operation is performed immediately after the winding is completed and the switch (S ₄ ) is turned off. When the release switch (S ₂ ) is set to “O
Such continuous shooting is performed even when the image is kept at "N".

When the camera body (BD) is started by the signal from the signal line (BS ₁ ) of the back circuit (BCKC), the auto focus adjustment operation is not performed, but the boosting of the flash device (FL) starts. The activation for the activation and the activation when the back circuit (BCKC) key operation is performed distinguish the width of the activation pulse, and the automatic focus adjustment operation when the back circuit (BCKC) key operation is performed May be performed. Further, as a device that does not operate when activated by the back circuit (BCKC) but operates when activated by the photometric switch (S ₁ ), there is a buzzer or the like that warns camera shake. In addition, a back circuit (BCKC) is used for the microcomputer (BMC) to determine what the start signal is due to.
The signal from is a pulse with a width less than a certain time,
If the input is made at a different input port from the switch (S ₁ ), such measures as limiting the pulse width are unnecessary.

The back circuit (BCKC) can control the exposure time longer than the longest exposure time of the camera body only in the M / LT mode, but in any mode if the exposure function is selected. Long-time exposure time control may be possible, and may be possible 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. And if the group interval is very long, 1
After the shooting of one group is finished, the boost is wasted,
The battery is wasted. Therefore, when the shooting of one group is completed, data indicating that the shooting of one group is completed is transmitted from the back circuit (BCKC) to the camera body (BD) (for example, the least significant bit of the back ICP is set to “1”). Do),
When this data is input, the camera body (BD) sends a boost prohibition signal to the flash device (FL) (the flash device (F
An empty bit or the fourth byte of the 3-byte data to be sent to L) is prepared), and 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 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 an external display part of the battery cover (2) of the battery chamber part, and in this state, the operation is stopped. (3) indicates a key cover for protecting some keys of the operation key unit, (4) indicates a grip unit, and (5) indicates an operation key unit.

FIG. 5 shows a state in which the key lid is opened while the external display unit is in operation in FIG. The function of each key will be described.
(6) is a function key for selecting each function. (7) Mode keys are used to select a mode in each function. (8) is an operation key for switching execution and non-execution of each function. (9)
Press the Enter key to change the external display one after another. (Ten)
Press the adjust key to change the external display from the control state to the numerical setting state and from the numerical setting state to the control state. (1
1) 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) is a memory clear key, which clears all the photometric data imported by the memory key.

Fig. 6 shows the operating status in the external display.
P ₁ mode of RE function is displayed. Each display unit will be described. (16) is a character display unit 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 position of the shutter speed value <T> and the aperture value <F>. (18) displays the mode selected in the EXPOSURE function. (1
9) shows the function name. Every time you press the function, EXPOSURE → (MULTI ・ M) → (BRACKET) → IMPRIN
T → INTERVAL → B & W → EXPOSURE → …… MULTI M function and BRACKET function are skipped and cannot be selected when EXPOSURE function is not executed. Also, the EXTERNAL function can be executed only when the control data from the meter (MET) is input from the camera body (BD) while the EXPOSURE function is in execution, and cannot be selected with the function key. (20) is a symbol indicating the selected function in the external display (indicates the displayed function. (21) is a symbol indicating that each function is in the execution state. (22) is the shutter (23) is an index indicating the speed value, and (23) is an index indicating the aperture value.When the shutter speed value is 2 seconds or less and the aperture value is F32 or more, respectively. It is also displayed as a symbol. (24) is a graphic display unit, and (25) is a photometric line.
Call it a line. (26) shows the P ₁ mode slope 2/3 program line is fast program. Due to the lens, the limit is F1.4 on the open side and F22 on the aperture side, and the arbitrary aperture limit is set between F2 and F8 and F11. In the character display area, lowercase numbers indicate 1 / 4EV units and display the control point <1/60, F4 + 1 / 4EV>, which is the intersection of the program line and the EV line.

Figure 7 is the slope of the program line indicates the P ₂ mode is 1/1, FIG. 8 is the inclination of the program lines 1 /
Shows P ₃ mode is 2. As can be seen from this figure, in the P ₁ and P ₃ modes, the graphic display dot is F
The value side is set to 1EV pitch and the exposure time side is set to IEV pitch, and the display dots are displayed in a straight line. Table 1 shows the transition of each function and each mode. The mode in the double frame is the one that is initially set when resetting, such as when replacing the battery. The operation procedure for each mode in each function will be described.

Figure 9 represents a P ₂ mode EXPOSURE function. Move the "" mark to (6) on the FUNC key.
Select the EXPOSURE function, then MODE key (7)
To display the mode name on the character display (16)
OGRAM 2 "is displayed and P ₂ mode is set.
The "▼" mark is lit above the "P" in the function mode display (18). Graphic display (24)
At the camera shutter speed control limit of 1/40
The program line is restricted by 00 seconds and 30 seconds and the lens control limits F1.4 and F22. In addition, the inclined part of the program line passes the point of F5.6 for 1/250 seconds in the initial setting state. Next, when the OPE key (8) is pressed, the EXPOSURE function becomes the execution state, the "" mark (21) lights up and the EV line (25) appears as shown in FIG. Next, press the ENT key (9) to display the mode name ("PROGRAM
2 ") is switched to the control display (hereinafter referred to as OUTPUT display). Shutter speed value 1/60 seconds and F2.8, which is the intersection of the program line and EV line, are displayed in the character part (Fig. 11). In the display, UP key (11), D
The OWN key (12) can be used to shift the slope of the program line. FIG. 12 shows a state shifted 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 for the FMAX value. In Fig. 13, FM is the default setting, so FM
The AX value indicates F22. When the FMAX value is lowered to F8 with the DOWN key (12), the slope of the program line stops at F8 and the limit is added, as shown in Fig. 14. FMAX
After setting the value, press the ENT key (9) to move to FMIN. In FIG. 15, the character display switches to the FMIN value setting. Because of the initial settings, F1.4 is displayed. UP
Change the FMIN value with the key (11). F2.8 in Fig. 16
Indicates a state in which is set. Next, press the ENT key (9), and the "COMPLETED" display indicating that the setting is complete is displayed in the character section. When the completion display appears, switch to the OUTPUT display with the ADJ key again, and the camera control value is displayed on the character display section (Fig. 18).

Next, the S mode (shutter speed priority mode) of the EXPOSURE function will be described. When "S MODE" is displayed on the character display by the MODE key (7) and the S mode is selected, the display is made as shown in FIG. here
It is in the execution state by the OPE key (8). (The lens is restricted by F1.4 and F22 depending on the lens.) When switching to the OUTPUT display by the ENT key (9), an underline (cursor) is displayed on the shutter speed value display of the character display (16). (Figure 20). The underline indicates that the numerical value can be changed by the UP key (11) or the 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 changes so as to be an appropriate exposure value.

Next, the A mode (aperture priority mode) of the EXPOSURE function will be described. When the "A MODE" display is displayed on the character display section by the MODE key (7) and the A mode is selected, it is displayed as shown in FIG. OPE key (8)
Is in the execution state. 30 seconds by camera (Display) and 1/4000 seconds are limited. When switching to OUTPUT display with the ENT key (9), 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).
When you change from F5.6 to F11 + 2 / 4EV with the UP key (11), the result is as shown in Fig. 24. At the same time, the shutter speed value changes so as to become 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 the aperture are restricted by the camera and the lens. When the display is switched to the OUTPUT display by the ENT key (9), the display becomes as shown in Fig. 26. At this time, an underline is displayed on the shutter speed value display section to indicate 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 section 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 will be as shown in Fig. 30. It is in the execution state by the OPE key (8). When the display is switched to the OUTPUT display by the ENT key (9), the display becomes as shown in FIG. The underline indicates that the aperture value can be changed with the aperture value display section, but the cursor key (13) is invalid 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 it 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, the display is switched to the OUTPUT display again with the ADJ key (10). The camera control value is displayed on the character display (Fig. 35).

Next, set the AVERGE mode that performs the average calculation of the MULTI / M (multimetering) function.
This MULTI · M function can be set by the FUNC key (6) when the EXPOSURE function is in the execution state. FUNC when the EXPOSURE function is executable
Use the key (6) to select MULTI / M function,
Next, press the MODE key (7) to display the character display (16)
"AVERGE" is displayed in the mode name display, and the AVERGE mode is set (FIG. 36). Here, the EXPOSURE function mode is set to P mode from the mode display. OP
Activated by E key (8), M key (1
According to 4), the metering value can be taken.
-6 showing the controllable range at the top of the graphic display
Indexes from (EV) to 6 (EV) are displayed on the LCD. In addition, the graphic display section displays an index indicating the gap between highlight calculation and shadow calculation ( ) And the index display (“■■■■”) indicating that it is not linked is displayed on the left and right. The one-point display (“■”) that is one step above the index in the middle is the first photometric point, and is normally located in the middle (0 position). When the output is displayed by the ENT key (9), the P mode (for example,
P ₂ mode) shutter speed value and the aperture value calculated by the is displayed on the character display unit (16) (37
Figure). At this time, “A” of “AVERGE” is displayed in the middle, and AVERA
Indicates that the mode is GE mode. Next, when the M key is operated, the value of the first photometry point which is one step higher than the index is taken in, and the one point display ("）") is shifted one step below the index display. At the same time, the second photometry point appears one step above the index display with reference to the first photometry point (FIG. 38). At this time, the value of the first metering point 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 it is P ₂ mode). The shutter speed value and aperture value are displayed. When the M key (14) is operated again, the value of the second photometric point is taken in, the first and second photometric points move to the state of being balanced with respect to the 0 position reference, and the character display section displays the first and second values. The second photometry point value is averaged, and the shutter speed value and aperture value in the P ₂ mode are calculated and displayed (Fig. 39). Also at this time, the third photometric point appears on the upper stage of the index display. After that, by operating the M key (14) sequentially, 8
It is possible to capture and display the photometric value up to the point, but from the 9th point, the 1st point is replaced, and the latest 8 photometric 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 (16)
The display changes from UT display to mode name display and “CENTER” is displayed. The CENTER mode is a mode for averaging the MAX and MIN photometric values, and indicates the MAX and MIN values of the photometric points taken one step below the index display on the zero position reference in the graphic display. The points move to a balanced position (Fig. 42). Next, press the ENT key (9) to display the OUTPUT, and the shutter speed value and aperture value calculated on the character display (16) and the CE value in between.
Display "C" in NTER mode (Fig. 43). The mode is changed to the HIGHLIGHT mode again by the MODE key (7), and the mode name display of "HIGHLIGHT" is displayed on the character display section. At the same time, the point display showing the MAX value of the captured metering point moves so that it comes to the position of plus 2.3 Ev, and the entire metering point display captured moves based on the point display showing the MAX value (No. (Fig. 44). At this time, the number of metering points that extend beyond minus 6 Ev is displayed at the minus 6 Ev position. Then press the ENT key (9)
UTPUT is displayed, and the shutter speed value and aperture value calculated according to the highlight standard and "H" in HIGHLIGHT mode are displayed between them in the character display (45th
Figure). Once again, the MODE key (7) changes to the SHADOW mode, and the mode name display of "SHADOW" is shown in the character display area. MIN of the metering points captured at the same time
The point display showing the value moves so that it comes to the position of minus 2.7 Ev, and the entire metering point display taken in with reference to the point display showing the MIN value moves (46th
Figure). At this time, the number of the photometry points that extend beyond the plus 6 Ev are displayed at the plus 6 Ev position. Next, ENT key (9) is used to display the OUTPUT, and the shutter speed value and aperture value calculated by the shadow reference and SH
"S" in ADOW mode is displayed on the character display (Fig. 47). If you operate the MODE key (7) again and again, it will return to the AVERAGE mode again and repeat in sequence. MULTI
The M-function has another mode in addition to the mode described above. When EXPOSURE function is in M (manual) mode, MULTI / M function is MANUA
The L mode is activated and the other keys are not activated, and the MODE key (7) is disabled. In MANUAL mode, the control value is EXPO
It is a set value even in the M mode of the SURE function, and the 0 position of the index display is the set value. Therefore, as shown in FIG. 49, the photometric value from the camera is present at a position displaced by the amount of deviation from the set value. ENT key (9)
The OUTPUT display is displayed, and the character display section (16) displays the shutter speed value and aperture value, which are the set values, and "M" is displayed between them (Fig. 50). OP
Since it is in the execution state by the E key, the photometric points are taken in by the M key as in the other modes. FIG. 51 shows a state in which one is taken, FIG. 52 shows a state in which two pieces are taken, and FIG. 53 shows a state in which eight pieces are taken. In these, the character display section (16) remains unchanged from the set value and does not change. As shown in FIG. 53, a graphic display is provided so that the photometric distribution of a certain subject can be determined at a glance. Here, it is possible to move the entire photometric distribution map composed of the taken photometric points left and right by using the UP key (11) or the DOWN key (12). 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, this function makes it possible to perform exposure control according to the brightness distribution of the subject, and further 2.
The width of highlight and shadow exposure fixed to 3Ev and 2.7Ev can be changed arbitrarily. Here, if the underline is moved to the aperture value by the cursor key, the aperture value is changed. In the above description, the point determined to be most appropriate in the photometric distribution map is arbitrarily changed by using the UP key (11) or the DOWN key (12) to change the shutter speed value or the aperture value, thereby obtaining the index display. By moving to the 0 position, an appropriate value for the subject can be set by its own judgment. In other words, M of this MULTI M function
ANUAL mode is a kind of metered manual in a generally known way.

Next, the BRACKET function will be described. This function is to perform exposure value shift shooting based on the taken photometric data.
Shift shooting is possible up to 9 frames, and the shift start value, shift width, and number of shot frames can be set. This function is skipped and cannot be selected if the EXPOSURE function is not in the execution state. Fig. 55 shows the mode name display, the EXPOSURE function shows that the P mode is selected, 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 to the one that shows the photometric range of M-function, a non-common one may be provided separately. An index indicating the offset range is displayed on the graphic display portion. Also, the BRACKET function is in a non-executing state. Press the ENT key (9) to display OUTPU as shown in Fig. 56.
The display changes to T. The character display (16) displays the amount of deviation from the reference value and the number of remaining frames.
Further, since it is in the execution state by the OPE key (8), a display showing a new operation state of the BRACKET function appears in the graphic display section (24) below the index in the same shift range. Next, press the OUTPU with the ADJ key (10).
When the T display is changed to the INPRUT display, as shown in FIG. 57, the message "FROM" first appears on the character display section (16) to set the shift start value.
Where the underlined number is the UP key (1
1) Or change to the desired value with the DOWN key (12).
Move as shown. Then, by the ENT key (9), a message "STEP" for setting the shift width appears on the character display section (16) (Fig. 59). Shift width is 1/4 Ev, 1 /
It is possible to select from 4 types of 2Ev, 1Ev, 2Ev, and use the UP key (11) or DOWN key (12) to change and set the underlined numerical value (Fig. 60). Then press the ENT key (1
By 2), the message "FRAME" appears on the character display to set the number of shooting frames as shown in Fig. 61. 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 (Fig. 62). Next, a message "COMPLETED" is displayed on the character display section (16) by the ENT key (12) to inform the completion of the setting. Here, when the ENT key (12) is operated, the display returns to "FROM" again and each setting display is repeated. ADJ
With the key (10), the display changes from INPUT display to OUTPUT display, and the character display (16) displays the amount of deviation from the reference value and the number of remaining flames (Fig. 64). Next, when the camera is released, the photometric value at that time is locked, and the exposure value of each flame that is shifted based on that photometric value is 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 aperture value calculated in any one of ₁ , P ₂ and P ₃ modes). FIG. 65 shows a state in which the camera has been released once, and the character display section (16) displays the amount of deviation from the reference value of the exposure value controlled by the next release and the number of remaining frames. Then, the graphic display section (24) changes to display the range from the next control (exposure) value to the final (exposure) value in the operation display.

FIG. 66 shows a state in which the camera is released twice, and FIG. 67 shows a state in which the camera is released eight times. The number of remaining frames in the character display (16) is "1"
Is displayed, indicating that the remaining frame is 1
The graphic display section (24) displays only the final value. Next, release the camera to shoot the last set frame, and the character display (1
6) and the graphic display unit (24) are reset to the initially set values, change to a state where new photometric values can be captured again as shown in FIG. 68, and return to the same display state as in FIG. 64.
Camera control can be repeated. When the display on the external display (2) is changed to EXPOSURE function while the BRACKET function is being executed, when the BRACKET function is executed, the EXPOSURE function is selecting the P, S, A mode in the graphic display. , Ev line moves in parallel on the program line, and when M mode is selected, the BRACKET function is executed because the aperture line moves in parallel. It can be easily confirmed.

Next, the imprinting function will be described. FUNC
When the imprinting function is selected by operating the key (6), the mode becomes the exposure control data imprinting mode, and when the OPE key (8) is operated, it becomes the operating state. At this time, if the exposure function is selected, the diagram at that time and the Ev line are displayed (FIG. 69). And EN
When the T key (9) is pressed, the back circuit (BCK
The control value (camera control value) calculated in C) is displayed (FIG. 70), and 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 data to be imprinted. In this case, no graphic display is performed.

Pressing the MODE key (7) switches to the year / month / day mode, and the mode name is displayed on the character display section (16) (No. 71).
Figure). Next, when the ENT key (9) is pressed, data from the calendar microcomputer (CAMC) is displayed (FIG. 72). If photographing is performed in this state, the data in the character display section (16) is printed. The 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 under the day data display section, and in Fig. 74, the UP key (11) is pressed three times to change the day data from 12th to "15th". It is in a state. When the ADJ key (10) is pressed in this state, the display state becomes as shown in FIG. 75 and this data is imprinted. It should be noted that imprinting is performed even in the display state of FIGS. 73 and 74. When 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 the up-count mode. Pressing the ENT key (9) in this state brings up the display state of FIG. 77. 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. When the ENT key (9) is pressed in this state, the cursor can be moved as shown in FIG.
When photographing is performed in this state, data added by "1" is sequentially imprinted. In addition, there is no carry to a blank digit. When the MODE key (7) is pressed in the up-count mode, the mode is set to the down-count mode and the mode name is displayed as shown in FIG. 81. In the following steps, the initial data is set in the same procedure as in the up count mode, and the display at the end of setting is the 82nd
FIG. In both modes, data that is sequentially changed and imprinted during shooting is displayed on the character display section (16).

When the MODE key (7) is pressed in the down-count mode, the mode becomes the fixed data imprinting mode, and the display state is as shown in FIG. 83. When the ENT key (9) is pressed below, Fig. 84, ADJ key (10)
Press the key to display the display shown in Fig. 85, and use the cursor keys (1
3), up key (11), down key (12) in combination, change the data as shown in Fig. 86 and Fig. 87.
Pressing the ENT key (9) brings the state shown in FIG. 88. In this mode, the set fixed data is imprinted unless the OPE key (8) and the MODE key (7) are operated.

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

Next, the INTERVAL (interval) function will be described. This function can operate the camera at a certain time interval to automatically perform shooting sequentially. In the interval function, the interval time, the number of frames at each interval shooting (hereinafter referred to as the number of frames), the number of times the interval is repeated (hereinafter,
The number of groups) 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 non-display state in this function. When the execution state is set by the interval function OPE key (8), the 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 select OUTPU.
The T display changes to the INPUT display, and as shown in FIG. 90, the interval time can be set first. The INTERVAL time "1" is displayed on the character display (16), and "H (Hour), M (Minu
te), S (Secord) ”are displayed together with the numerical value.
Also, the part where the underline value can be changed is displayed and UP
Use the 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). The interval time is 0 seconds to 99 hours 59 minutes 59. It can be set up to 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 section (16) changes to the display of "COMPLETED" indicating that the setting has been completed (not shown).
Press the key (10) to change the INPUT display to the mode name display again (Fig. 95). In this way, when starting the interval function, use the OPE key (8) to enter the execution state and use the ENT key (9) to display OUTPUT, and the start time is displayed on the character display (16) as shown in Fig. 96 Is 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 the back circuit (BCKC). (CMC) is a control microcomputer that controls functions, modes, data settings, exposure calculation, display data creation, imprint data creation, and imprint operation by key input. In addition, the display section (DM
It also controls C), (SD), (DD), and (CD), exchanges data with the calendar microcomputer (CAMC), 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 switch that is closed by operating the memory clear key (15).
(CUR) 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 the interrupt terminal (INTB) via the AND circuit (AG).
It is connected to the. Therefore, even if the control microcomputer (CMC) stops operating, the control microcomputer (CMC) starts operating when any switch is turned “ON”. The switch (OPE) is closed in conjunction with the operation of the operation key (8). The switch (FUN) is a switch that closes in conjunction with the operation of the function key (6), (AD
J 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 only connected to the input ports 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)
When it falls to w ", the operation from the No.1 step by the interrupt terminal (INTA) starts. First, the interrupt operation by the interrupt terminal (INTA) is enabled, and then the timing from the camera body (BD) To determine if the interrupt signal is input.
In the No. 2 step, it is judged whether or not the state is waiting for data input. Then, in the state of waiting for data input, it is determined in step No. 3 whether the data for imprinting (Tv, Av) has been input and the data for calculation has been input. This is because when the signal line (CSB) falls to "Low" as described above,
It can be identified because the signal line (BIO) is "High" for the operation data and "Low" for the imprinted data. When it is determined that the imprinting data is input, the transmitted data is read and it is determined in step No. 5 whether the imprinting function is selected. If it is determined in step No. 5 that the copying function is not selected, the copying operation is not performed and the process proceeds to step No. 15. On the other hand, if the copy function is selected, the process moves to step No. 6 and the data corresponding to the selected copy mode is sent to the LED drive circuit (L
Send to DR). In this operation, a synchronizing signal is sent to the signal line (CSLD) to sequentially send data in units of 4 bits. Then, when the signal line (LDEN) is set to "Low" and the display operation of the drive circuit (LDR) is operated, the light emitting diode (LED) of the segment is dynamically driven according to the imprint data, and imprinting is performed. Then, the control microcomputer (CMC) counts the time according to the film sensitivity read from the camera body. In the case of the black-and-white function, even if the read film sensitivity is the same data as that of the imprinting function, different times are counted. When the counting is completed, the signal line (LDEN) is set to "High" to stop the display operation by the drive circuit (LDR). When the rear curtain starts running on the camera body (BD), a “Low” pulse is output to the signal line (CSB). Therefore, the interrupt pin (INT
An interrupt signal is input to A), and at this time it is not waiting for data input, so move to the No. 11 step. And No.11
If it is determined that the copying operation is in progress in step No. 1,
Go to step 0 and set the signal line (LDEN) to “High”
As a result, the copying operation is forcibly stopped. This prohibits the printing operation from being performed even during film winding.

In step No.15, switch (SCN) on the camera body
Determine whether is "ON". If the switch (SCN) is "ON", the operation of steps No. 16 to 21 is not performed and the process proceeds to step No. 40. On the other hand, switch (SC
If N) is "OFF," then it is determined whether the count-up mode is set. Then, in the count-up mode, add "1" to the register CR in which the copy data is set and
Go to step o.40. On the other hand, if it is not the count-up mode, then it is determined whether or not it is the count-down mode. Then, in the countdown mode, "1" is subtracted from the content of the register CR, and the process proceeds to No.40 step.
On the other hand, if it is not the countdown mode, it is next determined whether it is the bracket function. If it is the bracket function, subtract “1” from the register BR in which the frame number of the bracket function is set, and go to No. 40 step. As it is
Move to step No.40. Data is printed even when the switch (SCN) is "ON". ) Is “ON” immediately
You may move to the step of No.40.

In the step of No.3, it is not the imprint data (signal line (BI
If it is determined that O) is "High"), the flow shifts to step No. 25 to read data from the camera body.
And when the exposure function is selected
Proceed to step No.27, where signal line (BIO) is “Low”
Wait for And the signal line (BIO) is “Low”
, IC outputs back ICP (“80H”). The camera body (BD) receives a signal line (BI
O) is set to "High", the signal line (CSB) remains "Low" and waits for the control microcomputer (CMC) to perform the 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 operation of the exposure calculation subroutine is performed. When the calculation operation ends, wait for the signal line (BIO) to go to "Low", and if it goes to "Low", the control data (Tv, Av), exposure control mode,
Send data such as non-interlocking, release enabled / disabled, etc., and move to step No.40.

When the camera body (BD) is started by the pulse output to the signal line (CSB) when it starts operating, or when the pulse at the time when the trailing curtain starts running is input, If not, and if the imprinting operation is completed, the process immediately proceeds to No. 40 step.

Switch (M), (CL), (CUR), (ENT), (U
When P) and (DWN) are turned ON and an interrupt signal is input to the interrupt terminal (INTB), or when the operation by the interrupt at the interrupt terminal (INTA) ends, the operation from the step No. 40 starts. To start. In the step of No. 40, the timer TIR register (for operating time count) is reset and the calendar microcomputer (C
Set the flag IOF that determines whether data is input or output from AMC) to "1" and move to the step of No.42. N
In the step of o.42, it is judged whether the flag IOF is "0",
If it is "1", the data from the calendar microcomputer (CAMC) is read, the flag IOF is reset to "0", and the process proceeds to No.47 step. On the other hand, if the flag IOF is "1", N
If it is determined in step o.42, the data is sent to the calendar microcomputer (CAMC), the flag IOF is set to "1" and No.
Go to step 47. The method of data transfer is to set the signal line (CSCA) to "Low". When outputting data, the signal line (I / O) is set to "Low". When inputting data, the signal line (I / O) is set to "Low". Set to “High”. Signal line (CSC
When A) becomes "Low", the calendar microcomputer (CAMC) is interrupted, and the calendar microcomputer (CAMC) outputs a pulse for data transfer synchronization. 4 in synchronization with this pulse
Bit data is sequentially transmitted and received via a data bus (DBUSI). The data sent from the calendar microcomputer (CAMC) to the control microcomputer (CMC) is the current year, month, day, hour,
Minutes, seconds, and hours until the start of the next shooting operation for interval shooting, and data indicating whether interval shooting is in operation, whether interval shooting has ended, and the like. 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. The data sent from the control microcomputer (CMC) to the calendar microcomputer (CAMC) includes the start date of the interval shooting, the hour, the minute, the interval shooting interval, the hour, minute, second, the number of interval shooting groups, and the interval shooting data. Number of frames, set exposure time in M / LT mode,
There is data such as whether the interval function is selected and whether M / LT mode is selected.

In the step of No. 47, the operation is performed according to the input states of the switches (M) to (MOD) and the state of the control microcomputer at that time, and the process proceeds to the step of No. 48. This No. 47 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 operation of the subroutine of step No. 47 is completed, it is possible to accept the interrupt signal to the interrupt terminal (INTA) and send the display data to the display microcomputer (DMC). This behavior is
First, set the signal line (DEN) to "Low" and display (DM
C), (SD), (DD), (CD) are in the operating state, then the signal line (CSDM) is set to "Low", and the display microcomputer (DMC)
Data is output, a synchronizing pulse is output from the signal line, and data is transmitted in 4-bit units. The data and display transmitted according to each function and mode will be described later based on the operation of the display microcomputer (DMC). Although the enable terminal is used in the figure, power is supplied to the display units (DMC), (SD), (CD), (DD) when the signal line (DEN) becomes "Low". It is like this. No.50 when data transfer is completed
In the step, determine whether any of the switches (M) to (MOD) are "ON", and if they are "ON", reset the register TIR and turn all switches "ON". If not, add "1" to the contents of register TIR and select No.
Move to step 53. Then, in the step of No. 53, it is judged whether or not the content of the register TIR has reached the constant value "K", and if it has not reached "K", the process shifts to the step of No. 42 and the same operation is repeated. If it is determined in step No. 53 that the content of the register TIR has reached “K”, it means that the key operation or the data exchange with the camera body (BD) has stopped and a certain time has passed. become,
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. If not, the A flag is reset. If the bracket function is selected, it is determined whether or not the bracket function is being operated. Is set. Then, after resetting or setting the A flag, the Ev value is calculated using data from the camera body (BD). On the other hand, if the bracket function is operating, the Ev value obtained at the start of the operation is not changed, so the operation shifts to the 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 an external function, and the data from the meter (MET) is used as the control value. If 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),
Next, 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. On the other hand, if it is not the M, M / LT mode, it is determined whether or not the multifunction is selected next, and if the multifunction is selected, the control Ev value is calculated based on the stored Ev value.

The subroutine of this multi-function operation is shown in FIG. In the center mode, find the maximum Evmax and minimum Evmin among the stored Ev values,
The control Ev is obtained by performing an operation of (Evmax + Evmin) / 2 from these two values. If it is not the center, it is determined whether it is the nylight mode, 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 the mode is the shadow mode. If the mode is the shadow mode, the minimum value Evmin of the stored Ev is calculated by Evmin + 2.7,
Calculate the control Ev. If there is no shadow mode, it is the average mode. At this time, 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 specific example of this calculation subroutine is shown in FIG. In this calculation, when Evmax (= Tvmax + Avmax) <Ev, Evmin (= Tvmin + Avmin)> Ev, the limit value is set as the control value because it is outside the control interlock, and the control returns to the main routine. On the other hand, when it is in the interlocked state, the operation according to the order shown in the flowchart is performed to calculate the control value, the non-interlocked flag is reset, and the process returns to the main routine (FIG. 100). In addition,
When the calculated value exceeds the control limit in the camera body (BD), the limit value is used as the calculated value and the set value is output as it is, but in the back circuit, the limit value is used as the set value,
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 open 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", it means that the bracket function is selected and no operation is performed. The operation shifts to.
In addition, even during the bracket function operation, the processing shifts to the bracket calculation for the next photographing. First, it is determined whether the mode is the M, M / LT mode. In the M, M / LT mode, the aperture value is moved by the amount of shift by the number of frames (the number of times of the next shooting), and the A flag is reset.

On the other hand, in the P ₁ , P ₂ , P ₃ , A, S modes, Ev is moved by the amount of displacement by the number of frames, the A flag is reset, and Tv, A
Move to the calculation subroutine of v. Thus, Tv,
When Av is calculated, 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 "Low"
If so, the release prohibition signal is set to prevent the photographing operation from being performed, and if the above conditions are not satisfied, the release prohibition 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) on the camera body (BD) is set to "Low" when the exposure control operation starts,
The interrupt operation by the interrupt terminal (INTA) starts. And
In step ST1, a timer interrupt (interruption performed every 1 second) is enabled, and the process proceeds to ST2. In step ST2, it is determined whether or not the switch (SCN) is "ON". If "ON", the process proceeds to step ST20 without performing the interval and M / LT operations. On the other hand, if the switch (SCN) is "OFF", it is determined whether it is interval shooting, and if it is not interval shooting, it is next determined whether it is M / LT mode. If the mode is the M / LT mode, the signal line (BS ₂ ) is set to “Low”. If the mode is not the M / LT 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". And
"1" is subtracted from the register IFR in which the number of frames is set, and if there is no register IFR but it is not "0", the process proceeds to step ST20. On the other hand, if the content of the register IFR is "0", the register with the next group number is set.
Subtract "1" from IGR to determine whether 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,
If it is not the M / LT mode, the signal line (BS ₂ ) is set to “High”, and if it is the M / LT mode, the signal line (BS ₂ ) remains “Low” and the process proceeds to step ST20. And the interrupt terminal (INT
A) and (INTB) can be interrupted, and it is determined whether the flag TIF is "1". If the flag TIF is "1", it means that a timer interrupt has occurred during this operation, and the TIF is reset to "0" to shift to the operation from step ST45. On the other hand, if the flag TIF is "0", the operation is stopped.

When the control microcomputer (CMC) sets the signal line (CSCA) to “Low” to transfer data, the calendar microcomputer (CAM)
C) operates by the interrupt terminal (INTB) from ST25. In ST25, a timer interrupt is enabled, and next, the state of the signal line (I / O) is determined, and whether to output or input data is determined. 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 counting is in the M / LT mode, the ST
Go to step 30. In step ST30, it is determined whether or not the interval function has been selected and is in an operating state. Then, if the interval function is not selected or is operating, the process directly proceeds to step ST20. On the other hand, when 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 set ST20.
Go to step. If it is determined in step ST26 that the data is output, the above-mentioned data is sent to the control microcomputer (CMC), and the process proceeds to step ST20.

When the timer is interrupted every 1 second, the operation from step ST40 and 41 is started. If the operation is done by the interrupt terminals (INTA) and (INTB), set the flag TIF to "1" to confirm the operation up to that point. Return to flow. On the other hand, when such an operation is not performed or when the operation based on (INTA) and (INTB) is completed, the operation from step ST45 is performed. Step ST
At 45, the calendar is rewritten by incrementing by 1 second. Then, it is determined whether or not the M / LT mode is operating. If the M / LT mode is operating, "1" is subtracted from the set second (Tv timer) to determine whether the Tv timer has become "0". If it does not become "0", the process directly proceeds to the step of ST62, and the operation is stopped by enabling the interrupt by (INTA), (INTB) and the timer. On the other hand, Tv in step ST48
If the timer content is "0", the signal line (BS ₂ )
Is set to "High" to start the trailing curtain running on the camera body (BD), and the process proceeds to step ST62.

If it is determined in step ST46 that the M / LT mode is not operating, then it is determined whether or not the interval shooting operation is being performed. If it is not interval shooting, the signal line (BS ₂ ) is set to “High”, and the process proceeds to ST62. In this case, the operation key (8) may be operated during the operation of the M / LT mode and the interval function, and the non-operation (operation stop) state may be set. 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.
Minutes before, a “Low” pulse is output to the signal line (BS ₁ ) to activate the camera body (BD) and the flash device (F
Start the boosting operation of L). In this case, since “High” is output to the signal line (BS ₂ ), the time until the start is calculated, and the process proceeds to step ST62. On the other hand, it is determined whether or may not be one minute before in steps of ST56 becomes the start time of the shooting of the discriminated is now one group, if reached the start time signal line (BS ₂₎ "Low Then, the process proceeds to step ST62.
On the other hand, before or after the start, it is determined whether "Low" is being output to the signal line (BS ₂ ) next,
If “Low” is output, one group is being photographed, and the process immediately proceeds 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 on 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, transfer clock (DCK2) from control microcomputer (CMC)
Based on the above, the data (4 bits) shown in Table 2 is transferred to the display microcomputer (DMC) via the data bus (DBUS2), converted into graphic display data by the display microcomputer (DMC), and the LCD segment driver (SD ) Is serially transferred to. LCD segment driver (SD) is LCD display RAM
1-bit data of the RAM for LCD display corresponds to lighting / non-lighting of 1-bit 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 built-in oscillator to generate the timing signals required 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 a liquid crystal display (LCD). The LCD segment drive signal (SGT) and the LCD common scan signal (CMT) are synchronized by a synchronization signal (HS) supplied from the LCD common driver (CD) to the LCD segment driver (SD). The liquid crystal display (LCD) uses these two signals, namely the LCD
Segment drive signal (SGT) and LCD common scan signal (CM
T) for dot matrix graphic display. The LCD drive reference power supply (DD) is connected to the liquid crystal display (LC
D) Stable power supply (VDP) to drive LCD segment driver (SD) and LCD common driver (CD)
Is being supplied to.

The above is the general operation up to the display of the graphic pattern on the liquid crystal display (LCD) by the data from the control microcomputer (CMC). This will be described in detail.

First, display microcomputer (DMC) from control microcomputer (CMC)
Display microcomputer (DMC) by signal line (DEN) to
Starts operation (power supply is started) and starts a reset routine shown in FIG. 106 (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. The 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. Fig. 107 The imprint routine is to set a flag for displaying the imprinting indication ("IMP") for a certain time during imprinting, and it is started by the imprinting signal (IP) from the camera (step). , The register is saved in step, the "IMP" display flag is set in step, and the register is restored in step to return to the original main routine in step.

Fig. 108 The main routine is started (step) by the signal (CSDM) from the control microcomputer (CMC) to the display microcomputer (DMC), and the display microcomputer (DM
Until all the processing in C) is completed, prohibit the restart of the main routine, input the transfer data from the control microcomputer (CMC) shown in Table 2 in step, and check the power supply voltage in step. When the power supply voltage is equal to or lower than the predetermined value, the power supply voltage check flag (BC flag) is set in step. At steps 29, the transfer data from the control microcomputer (CMC) is decoded into graphic display data.

This decoding is performed by first displaying the character display section in Fig. 6- (1
6) (step, mode name display, INP
UT display, OUTPUT display, referring to the table corresponding to each display content, it is converted into graphic display data, this data is output to the LCD segment driver (SD), and the LCD in this LCD segment driver (SD) Written to the display RAM (step). Subsequently, the index indicating the range from the control and the mode display portion FIG. 6- (18) are decoded in step and output to the LCD segment driver (SD) (step 21).

Next, an index showing the shutter speed value, Fig. 6- (22)
And an index indicating the aperture value, FIG. 6- (23) and a symbol indicating that each function is in the execution state, FIG. 6- (2
1) is decoded into graphic display data (step 22). In step 23, BC determined in step
The flag is tested, and if the BC flag is set, the battery check display (BC display) is displayed in FIG. 6- (24) (step 24). If the BC flag is not set, the operation corresponding to that function is performed in step 25 depending on which function is selected on the external display. Furthermore, this function also decodes itself (step 26), and displays the graphic display data in steps 22 to 26 in steps.
Output to LCD segment driver (SD) at 27. Here, the calculation according to the function selected in the external display in step 25 will be described in detail.

First, when the exposure function is selected, first, in order to draw the Ev line and FIG. 6- (25), the appropriate aperture value for each shutter speed value is obtained while sequentially changing the shutter speed value. Thereafter, exposure mode _{(P 1, P 2, P} 3, S, A, M, M / LT) set according to the line, Figure 6 - Draw (26) in the procedure up to the 109 Fig-114th Figure . If P ₁ , P ₂ , P ₃ mode is selected,
In Fig. 109, the minimum aperture value Avmax of the lens, the maximum aperture value Avmin of the lens, and the setting limit value Av of the minimum aperture side of the lens
Assuming that n is the setting limit value Avm on the open aperture side of the lens 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 draw a line with Tvx = Tvmax (step). The setting line in P ₁ , P ₂ , P ₃ mode, the calculation of Fig. 6- (26) is above, but P ₁ and P ₃
Avp line at Figure 109, line segments with slopes 2: 1 and 1: 2
Therefore, if you draw it in the same way as in P ₂ mode, the inclination will be stepwise, 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 the calculation are arranged in a straight line (see FIGS. 6 and 8). FIG. 111 shows how to draw a setting line in the S mode, where Tvn is a setting shutter speed. Step in Tvx
Draw a line (line segment) of Avy = Avmin while incrementing, then draw a line (line segment) of Tvx = Tvn,
Draw a line segment as Tvx = Tvn (step, finally again
While incrementing Tvx, draw a line of Avy = Avmax (draw a line segment. Fig. 112 shows how to draw the setting line in A mode, and Avn is the setting aperture value. At step ~, Tvx = -0.5 Every time, draw a line segment and step
While incrementing Tvx, the line (line segment) of Avy = Avn is set as Tvx = Tvmax in steps, and each line segment is drawn. FIG. 113 shows how to draw the setting line in M mode and M mode. While incrementing Tvx in steps to, the line (line segment) of Avy = Avn is changed from Avy = Avmin to Avy with Tvx = Tvn in steps. Draw a line (segment) up to = Avmax. Here, Avn and Tvn are the set aperture value and the set shutter speed value, respectively.

Fig. 114 shows how to draw a setting line in M / LT mode. In step ~, set Tvx = -0.5, and from Avy = Avmin to Avy
= Line (line segment) up to Avmax, while Tvx is incremented in steps, line (line segment) for Avy = Avn
Draw. The setting line of the M / LT mode can be drawn in exactly the same procedure as in the 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 range from the control is already -6 to +6.
The index (hereinafter abbreviated as ΔEvx) is decoded so that the liquid crystal display (LCD) is turned on in the step of FIG. 108, and the index indicating the shutter speed value, FIG. 6- (22), The index indicating the aperture value, FIG. 6- (23), is decoded so as to be turned off. Assuming that the Ev value controlled automatically in Table 4 is Evc, the Ev currently being measured is Ev ₀ , and the number of stored data is n, the point P ₀ (ΔEv ₀ , yo) currently being measured in step 115 in FIG. Plot, then line L
Plot ₀ (step). Plot the point Pn (ΔEvn, ym) stored in the step. However, 1 ≦ n ≦
8,2 ≦ m ≦ 9. This situation is shown in the flow chart of FIG. The above is the calculation method of the graphic display unit in the multi-function.

Next, the calculation of the graphic display unit when the bracket function is selected in the external display will be described. Index -6 to + indicating the amount of deviation from proper exposure
6 is decoded so that the liquid crystal display (LCD) is turned on in the step of FIG. 108, similarly to the multifunction. In the fourth step, if the current point is ΔEvCONT and the setting start point is ΔEvSET, then in step 116 in FIG.
x is calculated, and in steps from ΔEvx = ΔEvSET, ΔEvx = ΔEv
Draw a line (LSET) up to max, and in steps ΔEvx ＝
Draw a line (LCONT) from ΔEvCONT to ΔEvx = ΔEvmax. The above is the calculation method of the bracket function graphic display unit.

As described above, when the calculation of the graphic display portion is completed, the process proceeds to step 26 in FIG. 108, and the symbol 6 indicating which function is selected in the external display
Figure 20 (20) is decoded, and the decoding result in step 22 and the calculation result in step 25 are combined with LC in step 27.
Output to D segment driver (SD). Step 28
In ~ 29, I tested the "IMP" flag to show that the imprinting was in progress,
If set, the sub character "IMP" is decoded and output to the LCD segment driver (SD).

In this way, when all graphic display data has been decoded and serially transferred to the LCD segment driver (SD), the liquid crystal display (LCD) is turned on (step 30) and processed by the display microcomputer (DMC). End one loop. After that, in step 31, the control microcomputer (CMC) enters the interrupt signal (CSDM) standby state, and when the interrupt signal (CSDM) is sent again, the display microcomputer (DMC) restarts the main routine. From the step of FIG. 108, the process is started for the next graphic display.

As described above, according to the data sent from the control microcomputer (CMC) to the display microcomputer (DMC), the liquid crystal display (L
Graphic pattern is displayed on the CD).

In the back circuit (BCKC) shown in FIG. 98, two calendar microcomputers are supplied with power from a 3-volt power supply battery (B), and control and display microcomputers (DMC), (DMC) are used.
Is supplied with power from a four 6 volt power battery (A). In the battery check by the display microcomputer (DMC), the power supply batteries of both (A) and (B) are checked. And when the power battery of (A) is not good,
As shown in FIG. 117, the graphic display section (24) displays the symbol (A) and four batteries, and when the power source battery in (B) is useless, the symbol (B) is displayed as shown in FIG. 118. Two batteries are displayed.

Here with slope at P ₁ mode line (109th Fig Avp)
To explain how to draw a line, how to display a line with a slope of shutter speed value: aperture value = 1: 2,
It is conceivable that there are three routes (a), (b) and (c) as shown in FIG. That is, in this embodiment, the liquid crystal display (LC
Since the minimum display step of D) is 0.5 Ev steps in both the shutter speed direction and the aperture direction, the aperture value
If points are always displayed every 0.5 Ev steps, they can be displayed in FIG. 119 (a) or (b). The difference between FIG. 119 (a) and FIG. 119 (b) depends on the shutter speed value and aperture value rounding method at the time of display. When in this manner was displayed, the shutter speed value in the P ₁ mode: aperture value of the slope of 1: 2 is difficult to extremely understand. Therefore, in the present embodiment, as shown in FIG. 119 (c), only points for each 1-Ev step of the aperture value are displayed, and no points between them are displayed. This reveals the slope of the aperture value with respect to the shutter speed value. Exactly the same reason even in the P ₃ mode is not is set to display as shown in FIG. 8.

Next, how to draw the Ev line FIG. 6- (25) will be described. In the present embodiment, the display range of the liquid crystal display unit (LCD) is such that the shutter speed value is Tv ≦ 11 and the aperture value is Av ≧ 0.5, but both are indexes when Tv ≦ −0.5 and Av ≧ 9.5. It is not accurate because it represents in. So the Ev line is Tv
11 ≧ Tv ≧ 0,0.5 ≦ A without display for ≦ −0.5 and Av ≧ 9.5
Only displayed in the range of v> 9.5. However, the setting line FIG. 6- (26) is displayed in the range of Tv ≦ 11, Av ≧ 0.5.
By doing so, the control point at the intersection of the setting line FIG. 6- (26) and the Ev line FIG. 6- (25) is the shutter speed value 11 ≧ Tv ≧ 0, the aperture value 0.5 ≦ Av. Only the exact range ≤ 9.5 is displayed. FIG. 120 shows a specific drawing method of the Ev line. In this figure, first, Tvx = 0 (1 sec) is initially set in step, and Avy = Ev is set in step.
− Find Tvx. However, Ev is data No. 14-
It is the value sent from the control microcomputer (CMC) with the Ev value controlled by 15 auto. 0.5 ≦ Avy <9.5 in steps
It is determined whether (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 in 1Ev steps, and in the step, Tvx> Tvmax (Tvx
= 11), and if NO, return to step and repeat the following steps. And YES ie Tv> Tvm
When it becomes ax, the process proceeds to the step and ends. In addition, Tv
The step of incrementing x may be 0.5 Ev steps.

Advantageous Effects According to the present invention as described above, it is possible to shoot in a shooting mode that is not prepared in the camera body by mounting the adapter having the calculation function other than the calculation function provided in the camera body on the camera body. It is possible and possible to realize a very expandable camera system, and since the adapter also has a calculation function, it is necessary to prepare the function for the shooting mode planned for the camera itself in the camera body. Since there is no such problem, the circuit scale of the camera body becomes large and the problem that the camera body itself becomes expensive does not occur.

[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, FIG. 6 is a display example of the display unit (2) in the P ₁ mode, FIG. 7 is a display example in the P ₂ mode,
FIG. 8 is a display example in the P ₃ mode, and FIGS. 9 to 18 are diagrams showing the relationship between the key operation and the display in the P ₂ mode, FIGS. 19 and 20.
Figures and 21 show the relationship between key operation and display in S mode, Figures 22, 23 and 24 show the relationship between key operation and display in A mode, and Figures 25 to 25 Figure 29 shows the relationship between key operation and display in M mode, and Figures 30 to 35 show M /
Fig. 36 shows the relationship between key operation and display in LT mode, Figs. 36 to 41 show the relationship between key operation and display in multi-function averaging mode, and Fig. 42 and 43 show the key operation in center mode. Fig. 44, Fig. 45 showing the relationship between
The figure shows the relationship between key operation and display in highlight mode, Figures 46 and 47 show the relationship between key operation and display in shadow mode, and Figure 48 shows the relationship when returning to the average mode. Figures 49 to 54 show the relationship between key operation and display when M mode is selected in the multi-function, and Figures 55 to 68 show relationship between key operation and display with bracket function. Fig. 69 and Fig. 70 show the relationship between the key operation and the display in the exposure control data mode of the imprint function, and Fig. 71 to Fig. 75 show the year and Figures showing the relationship between key operation and display in month / day mode, Figures 76 to 80 show the relationship between key operation and display in up-count mode, and Figures 81 and 82 show down. Shows the relationship between key operation and display in count mode FIG from 83 Figure 88 Figure showing the key operation and display of the relationship between the fixed data mode, the
89 to 97 are diagrams showing the relationship between key operation and display and the relationship between shooting operation and display, Fig. 98 is a block diagram showing the entire back circuit (BCKC), and Fig. 99 is the control microcomputer (CMC). Flow chart showing the operation, FIG. 100 is a flow chart showing the operation of the arithmetic subroutine, FIG. 101 is a flow chart showing the operation of the arithmetic subroutine of the P, S, A mode,
FIG. 2 is a flow chart showing the operation of the arithmetic subroutine for the multi-function, FIGS. 103 and 104 are flow charts showing the operation of the key input subroutine, FIG. 105 is a flow chart showing the operation of the calendar microcomputer (CAMC), and 106. Figure is a flowchart showing the reset routine of the display microcomputer (DMC). Figure 107 is the display microcomputer (DMC).
Flowchart showing the imprint routine of No. 108
FIG. 110 is a flow chart showing the main routine of the display microcomputer (DMC), FIG. 109 is a diagram for explaining the display of program lines in P mode, and FIG. 110 is a display method of program lines in P mode. A flowchart, FIG. 111 is a flowchart showing how to display a program line in S mode, FIG. 112 is a flowchart showing how to display a program line in A mode, and FIG. 113 is a flowchart showing how to display a program line in M mode. FIG. 114 is a flowchart showing how to display the program line in the M / LT mode, FIG. 115 is a flowchart showing how to display the multi function, and FIG. 116 is a flowchart showing how to display the bracket function. 117 and 118 are diagrams showing examples of display when the power source battery is low, and FIG. 119 is a diagram showing examples of display in the P ₁ mode, Figure 120 shows
It is a flow chart which shows how to display an Ev line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masaaki Nakai, 2-30 Azuchi-cho, Higashi-ku, Osaka City, Minato Camera Co., Ltd., Osaka International Building (72) Takanobu Takamaki, 2-30, Azuchi-cho, Higashi-ku, Osaka, Osaka Kokusai Building Minolta Camera Co., Ltd. (72) Inventor Nobuyuki Taniguchi 2-30 Azuchi-cho, Higashi-ku, Osaka Osaka Kokusai Building Minolta Camera Co., Ltd. Examiner Kiyonobu Kitagawa (56) Reference JP-A-49-36330 (JP) , A)

Claims (3)

(57) [Claims] 1. A camera having light receiving means for receiving light from a subject and output means for outputting data based on light received by the light receiving means, wherein the data output from the output means of the camera is An external device including a readable reading unit, a calculating unit that calculates exposure control data based on data from the reading unit, and a sending unit that sends the exposure control data calculated by the calculating unit to the camera In a camera to which an adapter can be attached, a calculation unit that calculates exposure control data based on the data output from the output unit, and the data output from the output unit is sent to the reading unit of the external adapter. A sending means, a judging means for judging whether or not the external adapter is attached, and a sending means for the external adapter. A reading unit that reads the sent exposure control data; and when the determination unit determines that the external adapter is attached, the external adapter is based on the exposure control data read by the reading unit. An exposure control device for a camera, comprising: a control unit that performs an exposure control operation based on exposure control data from a calculation unit in the camera when the determination unit determines that the lens is not attached. 2. The camera according to claim 1, wherein the discriminating means discriminates whether or not the external adapter is attached by the presence or absence of the attachment signal sent from the external adapter. Exposure control device. 3. Light receiving means for receiving light from a subject, output means for outputting data based on light received by the light receiving means, and exposure control data calculated based on the data output from the output means. Calculation means, sending means for sending the data output from the output means to an external adapter, reading means for reading the exposure control data sent from the external adapter, and determination for determining whether or not the external adapter is attached And the determination means determines that the external adapter is not attached, based on the exposure control data read by the reading means when the determination means determines that the external adapter is attached. When it is determined, the control for performing the exposure control operation based on the exposure control data from the calculating means. In an adapter attachable to a camera having a step, a reading means for reading the data sent from the sending means of the camera, and a calculating means for calculating exposure control data based on the data from the reading means. An exposure control adapter comprising: a transmission unit that transmits the exposure control data calculated by the calculation unit to the reading unit of the camera.