JP2570689B2 - Camera system activation device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interval photographing apparatus and a data transmission apparatus, wherein data and signals are electrically transmitted and received between a camera body and the camera body selectively mounted on the camera body. The present invention relates to a camera system including a camera accessory such as a projection device.

2. Description of the Related Art A circuit configuration in which the operation of a circuit unit is started (ie, started) in response to a pressing operation of a shutter button, a key switch, or the like, and the operation is automatically stopped after a predetermined time has elapsed has been improved. According to this circuit configuration, in the case of power supply control by the power switch, the inconvenience of wasting power due to forgetting to turn off the power switch is eliminated. When this circuit configuration is applied to a camera system including a camera body and an electronic flash detachably mounted on the camera main body, the electronic flash is detachable from the camera main body. Although it is necessary to provide the electronic flash device, the operation of the electronic flash device is performed in accordance with the operation of the camera body, so that when the camera body is activated, the electronic flash device is automatically activated in response to this. A starting device for such a camera system is proposed in JP-A-59-75231. This activation device has an advantage that the electronic flash device is automatically activated only by activating the camera body, so that the operation of activating the electronic flash device is unnecessary.

Problems to be Solved In this conventional camera system, a data input operation unit such as a light emission amount setting unit is provided on the electronic flash unit side. However, if the user forgets to start the camera body, the electronic flash unit side Since data is not input even when the operation unit is operated, it may be mistaken as a failure. It is desirable that such a camera system be activated when a manual operation is performed.

In addition, the above-described conventional camera system activation device is applied only in a case where the camera accessory is passively activated by starting the camera body, but not only when the camera body passively activates the camera accessory but also on the contrary. It cannot be applied to a two-way camera system that is activated by a camera accessory. In this type of two-way camera system, the camera accessory has a calculation function different from the exposure calculation function of the camera body, and controls the exposure of the camera body with a calculation value setting value on the camera accessory side, or from the camera body. It is conceivable that the camera accessory performs predetermined calculations or imprints data on the camera accessory side based on the data.

In addition, in the system of the camera body and accessories, at least one of them must be activated in order to not miss a sudden photo opportunity, but if you do so, the power will be greatly consumed when you are not shooting, Not preferred.

An object of the present invention is to provide an activation device that can automatically activate not only the camera itself but also the other, regardless of which one of the camera body and the camera accessory is operated.

Means for Solving the Problems In a first aspect of the present invention, in a camera system including a camera body and a camera accessory, a control circuit of the camera body is changed from a non-activated state to an activated state in response to a manual operation of the camera body. First activation means for outputting a signal of the camera body; second activation means for outputting a signal for changing a control circuit of the accessory from a non-activation state to an activation state in response to a manual operation of the camera accessory; First
Third activation means for changing the accessory control circuit from the non-activation state to the activation state in response to activation of the camera control circuit by the activation means, and camera control in response to activation of the accessory control circuit by the second activation means of the camera accessory And a fourth activation means for switching the circuit from the non-activation state to the activation state.

According to a second aspect of the present invention, there is provided a start-up unit for setting the accessory control circuit from a non-startup state to a start-up state in response to a manual operation, and setting the camera body to a start-up state in response to the start-up of the accessory control circuit by the start-up unit. And an output unit for outputting a signal to the camera main body for the camera body.

In the first invention of the present application, operating means are provided on the camera body side and the camera accessory side, and the control circuit communicates with the other side to perform control according to the manual operation.

In the second invention of the present application, the camera accessory is provided with operating means, and the control circuit communicates with the camera body to perform control according to the manual operation.

According to the configuration of the first aspect, when the camera body is manually operated, the camera body is activated by the first activation means and the camera accessory is activated by the third activation means. Then, the camera accessory is activated by the second activation means, and the camera body is activated by the fourth activation means.

According to the second aspect, when the camera accessory is manually operated, the camera accessory itself is activated by the activation means, and the camera body is activated by a signal responding to the activation.

FIG. 1 is a block diagram showing an entire 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) can be exchangeably attached to and detached from the camera body (BD). The camera body has a back cover provided with only a data printing function and an interval shooting function. A back cover without a circuit provided can be attached instead of the back (BCK). The configuration and function of the back (BCK) and the back circuit (BCKC) will be described later.

A switch of the camera body (BD) (S ₄₎ and is connected via a terminal (T ₁₀₎ (MDR) is (hereinafter referred to simply Motor Drive) motor drive apparatus, an exposure control operation ends When the switch (S ₄ ) is set to “NO”, the motor
The motor in the drive (MDR) starts rotating, and the film winding and charging of the exposure control mechanism are performed by a functional interlocking 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 attaching it to the interchangeable lens / camera body. When the terminal of the camera body (CSL) is set to “Low”, the operation state is established, and various data unique to the interchangeable lens are sequentially output in series based on a clock pulse for reading from the camera 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 external light meter (hereinafter referred to as a meter).
Camera body (BD) and the terminal (T _14), a receiver for receiving the infrared signal sent from (T _15), the circuit being connected in (T ₁₆₎ (REC), the meter (MET). Also,
Receiver (REC) and the terminal _{(T 17), (T 18} ), the circuit being connected to (T ₁₉₎ (FL) is a flash device. The receiver (REC) is attached to the hot shoe of the camera body (BD), and the flash device (FL) is attached to the hot shoe provided on the receiver (REC) to obtain the connection state shown in FIG. Become. Note that only the receiver (REC) may be mounted on the hot shoe of the camera body (BD), or only the flash device (FL) may be mounted. Furthermore, a terminal group having the same function as the terminals (T ₁₄ ), (T ₁₅ ) and (T ₁₆ ) is connected to the camera body (B
D) Install the flash unit (FL) and the receiver (REC) directly on the hot shoe, and attach the flash unit (FL) via an adapter to the other part (for example, the bottom of the camera). The other of the receivers (REC) may be attached.

The meter (MET) can be used as an exposure meter of an incident light type or a reflected light type, and can also measure a stationary light and a 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, flash data (FL)
Whether to fire a test, furthermore, meter (MET)
There is data indicating whether or not control data has been sent from the PC. 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 signal line (ST ₁ ) is a line for transmitting a light emission start signal, and the flash device (FL) is closed when the X-ray point (SX) in the camera body (BD) is closed when the traveling of the front curtain (1C) is completed. )
Starts emitting light. The receiver (REC) is a meter (M
When the test flash signal is received from the ET, the receiver (RE)
C) pulls down this terminal (ST ₁ ) to “Low” to start light emission of the flash device. The signal line (ST ₂ ) is for data transmission from the camera body (BD) to the flash device (FL),
A bidirectional serial data bus for data transmission from the flash device (FL) and receiver (REC) to the camera body (BD). Further, it has a function of transmitting a signal indicating that the X contact (SX) is closed and light emission of the flash device (FL) has started from the flash device (FL) to the camera body (BD).

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 in which data is output to L) and the mode in which the camera body (BD) starts exposure control operation are transmitted from the camera body (BD) to the flash unit (FL) and receiver (REC) with pulses of different durations. Line. In addition, a synchronization clock pulse for data transfer is used for the camera body (BD).
From the camera to the flash unit (FL), to the receiver (REC), and also to transmit the flash stop signal from the camera body (BD) to the flash unit (FL) .

In the camera body (BD), the microcomputer (hereinafter referred to as “microcomputer”) (BMC) changes the line (CSF) to “Lo
When "w" is set, the interface circuit (IF) is ready to send and receive data. When the camera body (BD) inputs data, the microcomputer (BMC) sends a pulse of the first time width to the signal line. and outputs the (FMO), the flash unit the pulse signal via a signal line (ST ₃₎ (F
L) and the receiver (REC), and each becomes the data output mode. When a clock pulse for reading data is output from the terminal (SCK) of the microcomputer (BMC), the signal line (ST ₃ ) is passed through the interface circuit (IF).
Is output to

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 the system, a signal indicating whether the charging voltage of the main capacitor exceeds a predetermined value, a signal indicating whether the flash device has been automatically dimmed, and 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 a meter (MET), and the fourth byte is aperture value data. When the above data input is completed, the signal line (CSF) becomes "High", and data exchange with the flash device (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”,
A pulse of the second time width is output to the signal line (FMO). Then, the flash device (FL) enters the data input mode and reads 3 bytes of data from the data output terminal (SOU) of the microcomputer (BMC) based on the synchronization 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,
Set the signal line (CSF) to “Low” and set the signal line (FMO)
To output a pulse having a third time width. 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. When the actual exposure control operation starts, a “Low” pulse is output to the signal line (RL), and the interface circuit (IF) sends the signal to the flash emission control circuit (FLM) from the signal line (ST ₂ ). Is supplied via the signal line (FST), and the data (FLM)
The signal input via P) is output to the signal line (ST ₃ ). The signal line (ST ₂ ) is a flash unit (FL)
The signal of “Low” is output until the light emission of the flash device starts, and changes to “High” when the light emission of the flash device (FL) starts. The light emission control circuit (FLM) is provided with a light receiving element for receiving the subject light reflected from the film surface through the photographing optical system, and the signal lines (ST ₂ ) and (FST) are set to “Hig”.
When "h" changes to "Low", the integration of the output current of the light receiving element starts. The integrated value is determined by the film sensitivity (Sv) input from the AD and DA conversion circuit (ADA). When a value corresponding to the analog signal of data Sv + Cv based on the exposure compensation amount (Cv) is reached, a “High” pulse is output to the signal line (FSP), which is output via the signal line (ST ₃ ) to the flash unit (FL). ) 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. At the time of interval shooting in flash shooting using this function, a signal for starting the camera body (BD) is input from the back circuit (BCKC) a predetermined time (for example, one minute) before the start of shooting. When the camera body (BD) is activated, data exchange with the flash device (FL) is performed, and a 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 in L) is fully charged.

Specific examples of the above meter (MET), receiver (REC), flash device (FL), interface circuit (IF), and flash emission control circuit (FLM) are described in, for example,
-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, the operation of which is shown in the flowcharts of FIGS. 2 and 3. (BA) is a power battery, and a circuit excluding the photometric circuit (FLM), (AM), and the AD / DA converter (ADA) from the battery (BA) directly via the power line (+ E). Power is supplied to The transistor (BT) is controlled “ON” and “OFF” by a signal from the output port (OP ₀ ) of the microcomputer (BMC).
When "N", the photometry circuit (FL
M), (AMM), an AD / DA conversion circuit (ADA), and a level circuit (LEC). (DSP) is a display circuit, which includes a metering mode, an exposure control mode, a control exposure time,
The control aperture value, film sensitivity, exposure compensation amount, and flash device status are displayed. When the exposure time and the aperture value are out of the control interlock, the warning time is displayed because the exposure time and the aperture value at the control limit are reduced. This display circuit (DS
P) is when the control line (CSD) is “Low”
From the data output terminal (SOU) of the microcomputer (BMC) 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). The photometric circuit (AMM) outputs a voltage signal obtained by logarithmically compressing the output current of the light receiving element. When a "Low" pulse is output to the signal line (ADSTA), the AD, DA converter (ADA) outputs the output of the photometric circuit (AMM) to the terminal (CKOUT) of the microcomputer (BMC).
A / D conversion is performed based on the clock pulse from When the signal line (CSA) is “Low” and (ADMO) is “High”, the data obtained by AD conversion in synchronization with the clock pulse from the terminal (SCK) is input to the data input terminal (SIN) of the microcomputer (BMC). ), And the signal line (CSA) is “Low” (AD
MO) is "Low", the data is read out from the output terminal (SOU) by the aforementioned data Sv + Cv, and this data is read by D-
A conversion is performed and output to the light emission amount control circuit (FLM). When the signal line (CSA) is "High", data is not exchanged with the microcomputer (BMC). (G ₁ ) is a gate circuit,
When the signal line (CSL) becomes “Low”, the signal line (CSL) becomes active and data transfer from the lens circuit (LEC) to the microcomputer (BMC) becomes possible. (AFC) is a circuit for automatic focus adjustment,
When the signal line (AFEN) becomes “Low”, it is in the operating state,
The operation stops when it becomes “High”. The signal line (C
When SAF) is "Low", it reads the data for automatic focus adjustment from the microcomputer (BMC). 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 relays magnet operates and the aperture operation and mirror-up operation start. When the "Low" pulse is output to the signal line (AP), the aperture magnet operates and the aperture operation starts. When the "Low" pulse is output to the signal line (1C), the first curtain unlocking magnet operates and the front curtain starts running, and the "Low" pulse is output to the signal line (2C). (G ₂ ) is a gate circuit, which becomes active when the signal line (CSB) goes “Low”, and is activated by the back circuit (BCKC) and the microcomputer. (BMC) The data line (CSB) has a function to activate the back circuit (BCKC), and the camera body (BD)
Becomes active, and attempts to exchange data with the back circuit (BCKC), the back circuit (BCKC) also becomes active. Furthermore, the signal line (CSB) is connected to the back circuit (BCK
When data is being imprinted in C), a "Low" pulse is output when the trailing curtain starts leading in order to prevent film winding. 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 (BI
When O) is "High", data is sent from the camera body (BD) to the back circuit (BCKC), and when "Low", data is sent from the back circuit (BCKC) 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 at the first step of pressing down the release button, and starts a 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) are completed during bracket shooting, the shift to the exposure control operation is performed even if the release switch (S ₂ ) of the camera body (BD) is “ON”. The camera 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). During interval shooting, the back circuit (BC
KC) can set the shooting start time, the number of frames, and the number of time intervals and the number of times (hereinafter, referred to as the number of groups) to perform shooting for the number of frames. 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. When the shooting of one group is completed, the signal line (BS ₂ ) is set to “Hig
h ", count the time for the set time interval, display the remaining time. When the remaining time reaches 0 seconds,
The signal line (BS ₂ ) is set to “Low” again, and shooting for the number of frames is performed. When the above operation is completed, the set interval shooting mode is released. Even if the back circuit (BCKC) is operating in the interval shooting mode, the release switch (S ₂ ) of the camera body (BD)
Is closed, the set start time and time interval are ignored, and the photographing operation is performed. That is, even if the start time has not been reached, when the release switch (S ₂ ) is turned “ON” and the photographing operation is started, the back circuit (BCKC) outputs the signal line (BS ₂ ) until the photographing for the number of frames is performed. Is “L
ow have to ". Also, performs a similar operation when the set time interval is the release switch (S ₂₎ is closed until the lapse. Here, the number of imaging operations performed by the camera body (BD) is , Is determined by counting the number of input pulses for data imprinting 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 mode of the camera is a program automatic exposure control mode (P mode), an exposure time priority aperture automatic exposure control mode (S mode), an aperture priority exposure time automatic exposure control mode (A mode), and a leading exposure control mode (M mode). There is. These modes change in the order of P → A → M → S → P... The switch (SIS) is used to set the film sensitivity. Each time the switch (SIS) changes from “OFF” to “ON”, the film sensitivity changes in steps of 1 / 3Ev and reaches the upper limit. When the switch (SIS) changes from "OFF" to "ON" after the
When the switch changes from “F” to “ON”, the value increases again. (SOR) is a switch for setting the exposure compensation amount. Each time the switch (SOR) changes from “OFF” to “ON”, the value increases to 0.
→ 1/2 → 1 → 1 1/2 → 2 → 2 1/2 → 3 → 3 1/2 → 4 → -4 →
−3 1/2 → −3 → −2 1/2 → −2 → −1 1/2 → −1 → −1 / 2
→ It changes in the order of 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, 32sec → 16sec → 8sec
→ …… → 1 / 1000sec → 1 / 2000sec → 1 / 4000sec → 32sec →…
... and in M mode, 32sec → 16s
ec → …… → 1 / 2000sec → 1 / 4000sec → Valve → 32sec →…
... and so on. Therefore, the valve mode can be set by operating the switch (ST) in the M mode. 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. The above switches (SMO), (SIS), (SOR), (ST), and (SA) are switches that are closed by operating respective operation keys provided outside the camera. The switch (S ₁ ),
_{(S 2), (SMO)} , (SIS), (SOR), (ST), (SA)
Are connected to the interrupt terminal (INT) of the microcomputer (BMC) via the AND circuit (AN). Therefore, when the data setting key provided outside the camera is operated, the release button is operated. When the back circuit (BC
When a “Low” signal is input from the KC) via the signal lines (BS ₁ ) and (BS ₂ ), the microcomputer (BMC) accepts this interrupt signal if the microcomputer (BMC) is in an operation stop state. Start operation. The switch (SCN) is a switch linked to a mechanical film counter. This switch (SC
N) is “ON” until the film counter reaches the position indicating “1” of the number of frames to be shot, and “OFF” after the position of “1”
become. The signal from this switch (SCN) is
Input to the back circuit (BCKC) via the input port (IP ₇ ) of the MC) and the terminal (T ₉ ). The microcomputer (BMC) controls the exposure with the shortest exposure time and maximum aperture while the switch (SCN) is "ON". On the other hand, the back circuit (BCKC) does not perform the data imprinting operation even if a pulse signal is input from the signal line (IP) while the switch (SCN) is “ON”. Furthermore, the back circuit (BCKC) has a function of adding or subtracting "1" from the set value for each pulse from the input signal line (IP) every time a picture is taken, and imprinting 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 with a time width corresponding to the film sensitivity to the signal line (IP), but the back circuit (BCKC) shown in FIG. The time corresponding to the read film sensitivity is made in the back circuit (BCKC), and the data is imprinted 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 film sensitivity data from the camera body and create a time corresponding to this data, and has a data imprinting unit that imprints data while a pulse is being input from the signal line (IP). The microcomputer (BMC) has such a function because the back cover provided may be adhered to the camera body (BD). 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.

Hereinafter, the operation of the camera system shown in FIG. 1 will be described based on the flowcharts shown in FIGS. Switch (S ₁ ),
(S ₂ ) Either (SMO), (SIS), (SOR), (ST), (SA) is turned “ON” or the back circuit (BCKC)
When a “Low” signal is input from the signal lines (BS ₁ ) and (BS ₂ ), the output of the AND circuit (AN) becomes “Low” and the interrupt terminal (INT) of the microcomputer (BMC) becomes “Low”. Fall to.
Then, the microcomputer (BMC) whose operation has been stopped starts the operation from step # 0. First, in the step # 0, a “Low” pulse is output to the signal line (CSB),
Activate the back circuit (BCKC), and in step # 1,
The transistor (BT) is turned “NO” and the photometric circuit (FLM)
(AMM), AD, DA conversion circuit (ADA), lens circuit (L
Start supplying power to EC). Then, in the step # 2, it is determined whether or not a “Low” signal is input to the input port (IP ₁ ), that is, the switch (S ₂ ) is turned “ON”, or the signal line (BCKC) of the back circuit (BCKC) It is determined whether or not a release signal is input from BS ₂ ). And the input port (IP
_{If a} "Low" signal is input to ₁ ), the process proceeds to step # 3. In step # 3, the switch (S ₄ ) is set to “OF
F "charge of the exposure control mechanism would have to determine whether complete state," the processing proceeds to step # 10 because the exposure control operation unless turned OFF "can not be started. Meanwhile, the switch (S ₄₎ is If it is "OFF", it is next determined whether or not the flag RLEF is "1" in step # 4.
RLEF is ready for exposure control data (Tv, Av), and is set to "1" if the release inhibit signal is not input from the back circuit (BCKC). It is reset to "0" when the release prohibition signal (input at the end of bracket shooting) is input from the circuit (BCKC). If the flag RLEF is "1" in the step # 4, the flow shifts to the flow of the exposure control operation starting from the step # 110, and if the flag RLEF is "0", the flow shifts to the step # 10. Also, input port (IP ₁ ) in step # 2
If a "Low" signal is not input to step # 10, 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 whether entered is "Low" to the input port (IP ₀₎ that by the switch (S _1), a preparatory operation for discriminating whether by back circuit (BCKC). Next, in step # 12, one of the portion in the photometric circuit (AMM) and the light receiving element for averaging 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 serial input / output operation is repeated several 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 F is reset to “0” (in this case, it has already been reset to “0”), and the process proceeds to step # 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 one minute before the interval shooting, or when the back circuit (BCKC) starts the operation for the exposure calculation, the camera body (BD) is started. In order to start, a “Low” pulse is output to the signal line (BS ₁ ). By the way, the back circuit (BCKC)
It is not desirable that the automatic focus adjustment operation is performed when the camera body (BD) is activated, and the lens is inadvertently moved. Therefore, when the back circuit (BCKC) starts the camera body (BD), the time from the time when the interrupt signal is input to the microcomputer (BMC)) is shorter than the time from step # 21 to the time of step # 10. A “Low” pulse with a width longer than the time is output to the signal line (BS ₁ ).
At the time of determining whether the input port (IP ₀ ) is “Low” in step # 21, the signal line (BS ₁ ) is “High”. 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. On the other hand, if it is determined in step # 21 that the input port (IP ₀ ) is “Low”, this means that the photometry switch (S ₁ ) is “ON”, Set the line (AFEN) to “Low”, activate the circuit for automatic focus adjustment (AFC), set the signal line (CSAF) to “Low”, send the data for automatic focus adjustment, and set the signal line (CSAF) to “High”. # 25
The flag S ₁ F is reset to “0” in the step (1), and the process proceeds to the step # 26. In step # 26, data is read from the flash device (FL) and the receiver (REC). As described above, this operation is performed on the signal line (CS
F) is set to "Low", and a pulse of the first time width is output to the signal line (FMO). Then, a serial input / output operation is performed. First, the first byte data from the flash device (FL), and then the second, third, and fourth bytes of the data read from the receiver (REC) from the meter (MET).
Data is output in the order of the byte, and the data is read. Then, set the signal line (CSF) to “High” to # 26
The operation of the step is ended.

Next, in step # 30, it is determined whether or not the film sensitivity setting switch (SIS) has changed from "OFF" to "ON".
When it is determined that the change has occurred, the film sensitivity data is
Increase by v and go to step # 32. On the other hand, if the change has not been determined, the process immediately proceeds to step # 32, and it is determined whether or not the exposure correction amount setting switch (ORS) has changed from “OFF” to “ON”. When a change is detected, the exposure correction amount is increased by 1/2 Ev of step # 33, and the process proceeds to step # 34. If 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 normal number of photographed frames ("1") (S ...). In this case, the process proceeds to step # 35. . In step # 35, the shortest exposure time (Tvmax)
Then, the maximum aperture value (Avmax) corresponding to the minimum aperture is set for control, the flag RLEF is set to "1" in step # 108, and the process proceeds to step # 75. The camera body ignores this data even if the control data from the back circuit (BCKC) or the meter (MET) is read from the receiver (REC) until the number of shot frames reaches the normal number of frames. Tvmax, Avmax
To perform exposure control. In this case, the exposure calculation in the camera body (BD) is not performed, and the settings other than the data of the film sensitivity and the exposure correction amount are not accepted. Even if data for prohibiting the exposure control operation is input from the back circuit (BCKC), it is ignored.

In the step # 40, it is determined whether or not the flag BCKF is "1". The back circuit (BCKC) calculates the exposure control data for this flag BCKF, and this data is stored in 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, if 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". When the change is detected, the exposure time is increased by 1 Ev. On the other hand, if no change in the switch (ST) is detected, the process immediately proceeds to step # 46. As 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). If there is no change, the process directly proceeds to step # 50, and if the change from “OFF” to “NO” is determined, the aperture value is increased by 1 / 2Ev and the process proceeds to the next step # 50. . The detection of the change of the switches # 30, # 32, # 41, # 44, and # 47 from "OFF" to "ON" is detected in each step, and the state of the switch at that time is stored. It can be detected by comparing the state of the switch at the time of that step with the signal storing the previous state.

In step # 50, the signal line (CSA) is set to “Low”, and then the 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 (CKOUT) is stopped, and the process proceeds to step # 51. And # 51
In the step (1), it is determined whether or not the flag BCKF is "1".
Go to step. 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. This external function is used when the exposure control data from the meter (MET) is input, and if the back circuit (BCKC) performs the exposure calculation function (hereinafter referred to as the exposure function), the exposure function is activated. Mode (three P modes, S, A,
M mode and manual 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 faction, the average value of a plurality of 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 an AD / DA conversion circuit (ADA).
Photometric data read from _{(Bv-Av 0) (Av} 0; maximum aperture), the open aperture value data (Av ₀₎ read from the 6 byte lenses circuit (LEC), 7 byte maximum aperture 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
C) When the exposure function is selected, 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 or not the back ICP is “80H”. If the back ICP is not “80H”, the back cover without the back circuit (BCKC) is attached or the back circuit (BCK
This is the case where the exposure function is not selected in C). In this case, the calculation or meter (ME
# 58 to perform the operation based on the data from T)
The flag BCKF is reset to "0" in the step (1), and the process proceeds to the step # 90. Back ICP is “80” in step # 57
If it is determined that the exposure function is "H", the exposure function is selected in this case, and the flow shifts to step # 60 to set the flag BCKF to "1" and sends it to the back circuit (BCKC). Back circuit (BCKC) based on the data
Waits for a time sufficient for calculating the exposure control data in step # 61. During this time, the back circuit first calculates a photometric value based on the transmitted data. During this time, the signal line (CSB) remains at “Low”. This means that (Bv
−Av ₀ ) + Av ₀ = Bv is only calculated, but if the multi-function is selected, it depends on the mode selected from the above-mentioned average mode, center mode, highlight mode and shadow mode. To calculate. 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, an exposure calculation is performed according to the photometric data thus obtained and the set exposure mode, and control data is calculated. This calculation is performed in a first program (P ₁ ) mode with a slope of 2/3 (in principle, Av = 2 / V) in which Bv + Sv = Ev is divided into an aperture value and an exposure time at a ratio of 2: 1 as a program mode. 3 ・ Ev 、 Tv = 1
/ 3 · Ev), second program (P ₂ ) mode with slope 1/2 (A
3 in the third program (P ₃ ) mode (Av = 1 / 3Ev, Tv = 2 / 3Ev) with v = 1 / 2Ev, Tv = 1 / 2Ev) and slope 2/3 There are types. In the S mode, Ev−Tv = Av is calculated from Tv set in the back circuit (BCKC), and the A mode is set.
Ev−Av = Tv is calculated from Av, and in the M mode, the set Av and Tv are calculated as control values. The calculated Av
EV-Avmax = Tv, E if the Av <Av ₀ if and but Av> Avmax
V−Av ₀ = Tv is calculated and this Tv and Avmax, or Tv and Av
₀ is the calculated value. Similarly, when Tv <Tvmin, Tvmi
n and EV-Tvmin = Av, if Tv> Tvmax, Tvmax and EV-Tvma
Let x = Av be the calculated value. Also, P _1, P _2, when the P _{3 mode, Avo <Av 1, Av 2} <Av 1 is manually set the Avmax, Av ₂
Use to limit the aperture.

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 time is set, 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 is completed, (BS ₂ ) is set to" High "to cause the trailing curtain to travel. The display data of the camera body is for valve display. Sends data for setting time display instead of data.If multi-function is not selected, the exposure control diagram and Ev value line for each mode are backed with the vertical axis as the aperture value and the horizontal axis as the exposure time. When the multi-function is selected, each stored value and the current value based on the exposure control value are graphically displayed.

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. In this case, the graphic display at this time indicates which position is currently being photographed 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 sufficient time has elapsed for the above calculations to complete, the microcomputer (BMC) proceeds 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. Exposure mode with back 4th byte (P mode for P ₁ , P ₂ , P ₃ , M for M, M / LT mode)
Mode, external function is meter metering mode), 1,
There are out-of-coupling data indicating that the 2-byte control data is data limited to a limit value because Ev is out of control interlocking, data indicating whether the exposure control operation is prohibited (release prohibition data), and the like. When reading of the 4-byte data is completed, the microcomputer sets the signal lines (CSB) and (BIO) to “Hig”.
h ", and in step # 63, the read Tv and Av are set as control data. Then, it is determined whether or not release prohibition data has been read, and if so, the flag RLEF is set to" 1 ". If not, the flag RLEF is reset to "0", and the routine proceeds 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 # 75, 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, the signal line (CSF) is set to “Low”,
A pulse of the second time width is output to the signal line (FMO). When this pulse is read by the flash unit (FL), data from the camera body is read. In the microcomputer (BMC), the first byte is the control aperture value and the exposure control mode, the second byte is the data obtained by adding the film sensitivity and the exposure correction amount (Sv + Cv), and the third byte is the focal length data of the interchangeable lens ( fv). The method of using these data is as described above.

When the above operation is completed, the switches (S ₁ ), (S ₂ ), (SMO), (SIS), (SOR), (S
It is determined whether at least one of T) and (SA) is closed. If at least one is closed, the timer is reset and started in step # 80, and # 2
Then, 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 expired, and if not, the flow returns to step # 2. Return. On the other hand, when 10 seconds have elapsed since all the switches are turned "OFF", the flow proceeds to step # 85. In the step # 85, the interrupt to the interrupt terminal (INT) is enabled, and the flags RLEF and BCK
F is reset to “0”, the display is turned “OFF”, the power supply transistor (BT) is turned “OFF”, and the microcomputer (BMC) stops operating.

If it is determined in step # 57 that the back ICP is not "80H", the flag BCKF is reset to "0" in step # 58, and the flow shifts 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,
The data from the read meter (MET) is limited to the aperture value between the maximum aperture value and the maximum aperture value for the aperture value, and the exposure time is set to between the shortest and longest exposure times for constant light photography. If so, limit it to the range between the tuning limit and the longest exposure time. Then, the data from the meter (MET) obtained in this way is set as a control value,
The process proceeds to step # 105 as the M mode as the exposure control mode and the meter metering mode as the metering mode.
On the other hand, if 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”.
EF is set to "1", and the routine proceeds to the 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 (AFEN) is set to "High" to stop the operation of the automatic focusing circuit (AFC), and then the release signal is transmitted to the flash unit (FL). In this operation, the signal line (CSF) is set to “Low” and the signal line (FM
O), a pulse of the third time width is output, and the signal line (CS
This is done by setting F) 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, the signal line (CSB) is set to “Low”, and control exposure time data and aperture value data are sent to the back circuit (BCKC). This data is used as data for imprinting in the back circuit (BCKC), and when this data is input, the back circuit starts the data imprinting operation when the imprinting function is selected. Some of the imprint functions include the control data mode, year / month / day mode, month / day / year mode, day / month / year mode, month / day / hour mode, day / hour / minute as the imprint mode. Mode, hour / minute / second mode, count-up mode, count-down mode, and fixed data mode. In the control data mode, control data calculated by the back circuit (BCKC) (only when the exposure function is selected) or control data sent from the camera body (BD) in step # 112 is printed. The year / month / day mode, month / day / year mode, day / month / year mode, day / month / hour mode, day / hour / minute mode, and hour / minute / second mode are the back circuit (BCKC) Each data from the calendar circuit is printed in the order of each mode. 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.

Next, in step # 113, the microcomputer (BMC) sets the signal lines (CSA) and (ADMO) to "Low", and converts the addition data (Sv + Cv) of the film sensitivity and the exposure correction amount into an AD / DA converter. (ADA). When the circuit (ADA) reads this data Sv + Cv, it performs DA conversion and outputs it to the flash light emission amount control circuit (FLM). Next, to control the printing time, set the film sensitivity to the timer, and in step # 115, set the signal line (IP) to "Low" and set the back circuit (BCKC)
It is possible to determine the start of data imprinting as described above, and to start the imprinting operation of the data imprinting apparatus having no function of controlling the imprinting time. Then, interruption by the timer is enabled, and counting of the timer is started. Then, in step # 120, a counter interrupt is enabled, a "Low" pulse is output to the signal line (RL) to operate the release magnet, and the aperture operation and the mirror-up operation are started. Then, in step # 122, a sufficient time is waited 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 aperture magnet to stop the aperture operation. Then, the timer interrupt is enabled and the process returns to the main routine. Also, when an interchangeable lens that cannot control the aperture is attached, or when an interchangeable lens is not attached, there is a case where the counter interrupt is not performed.
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 the step # 125, it is determined whether or not 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 (1C) to operate the front curtain magnet and start running the front curtain. Next, the exposure time is counted, and when the counting is completed, the signal line (2
In step C), a “Low” pulse is output, the rear curtain magnet is operated to start running the rear curtain, and the process proceeds 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 signal to the input port (IP ₁ ) is “High”
Wait to become. At this time, if there is mounted back circuit (BCKC) is, the release button is released, wait for the switch (S ₂₎ is "OFF", the switch (S ₂₎ is "OF
When "F" is reached, the rear curtain starts running. On the other hand, when the back circuit (BCKC) is attached and M / LT is selected, the back circuit starts when the signal line (IP) goes "Low". (BCKC) has started counting time, the signal line (BS ₂ ) is set to “Low”, and the back circuit (BCKC)
When the counting of C) is completed, the signal line (BS ₂ ) is set to “Hi”.
gh ", and the camera body (BD) starts running the rear curtain with this signal. In this way, in the M / LT mode, the signal line ( The exposure time count starts with the signal input via IP), and the exposure time is not precisely controlled because the control is performed with 1 second as the minimum unit. Minutes do not significantly affect exposure.

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 (1), the signal line (IP) is set to "High" to stop the imprinting operation, enable the counter interrupt, and return to the main routine. In step # 135, when the exposure time is short, the signal line (IP) may be "Low" even when the rear curtain starts running. 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 are not interrupted, and the system waits until the trailing curtain is completed and the switch (S ₄ ) is turned “ON”. Then, when the switch (S ₄ ) is turned “ON”, the flags RLEF and BCKF are set to “0”, the process returns to the step # 2, and the above operation is performed.

Interval function with back circuit (BCKC)
When the mode of the continuous shooting such bracket function is selected from the signal line (BS ₂₎ which remains entered is signal "Low", even during winding operation has prepared the operation of the exposure control described above as soon as the switch (S ₄₎ is "OFF" following exposure control operation is performed by winding is complete. 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.
Is a pulse with a width less than a certain time,
If the input is made to an input port different from the switch (S ₁ ), such a measure as limiting the pulse width becomes 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, at the time of 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 flash unit (FL) is starting to boost pressure. By the way, since the flash device maintains the boost for 15 minutes after the start of the boost operation, the boost is very often continued even after the photographing of one group ends. And if the interval between groups 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 a battery cover in the battery compartment, and (2) is an external display unit. 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 external display unit is in an operating state and the key cover (3) is opened 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 between execution and non-execution of each function. In (9), the external display is sequentially changed by an enter key. Step (10) changes the external display from the control state to the numerical value setting state and from the numerical value setting state to the control state using the adjustment key. (11) is an up key and (12) is a down key to change the numerical value in each mode and to shift the program line. In (13), each digit to be changed at the time of changing the numerical value in each mode is sequentially transmitted by a cursor key. (14) is a memory key, which takes in the photometric data from the camera. (1
5) is a memory clear key to clear all photometric data taken in with 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 section using 10 digits of a 5 × 7 dot liquid crystal display, and displays a shutter speed value and an aperture value, a mode name, and a message of an operation procedure. (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. (19)
Indicates the name of each function. Each time the function key (6) is pressed, EXPOSURE → (MULTI ・ M) → (BRACK
ET) → IMPRINT → INTERVAL → B & W → EXPOSURE → ... The MULTI / M function and the BARCKET function are skipped when the EXPOSURE function is in the non-execution state, and cannot be selected. Also EX
The TERNAL function can be executed only when control data from the meter (MET) is input from the camera body (BD) while the EXPOSURE function is in the execution state, and cannot be selected with the function keys. (20) is a symbol indicating the selected function in the external display. (21) is a symbol indicating that each function is in an execution state. (22) is an index indicating a shutter speed value, and (23) is an index indicating an aperture value. When the shutter speed is less than 2 seconds When the aperture value is F32 or more 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. Depending on the lens, the limit is F1.4 on the open side and F22 on the aperture stop side, and the arbitrary aperture limit is performed between F2 and F8 and F11. In the character display section, lower case numbers indicate 1 / 4EV units, and indicate control points <1/60, F4 + 1 / 4EV>, which are intersections of program lines and EV lines.

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. The graphical representation of the dot F value side 1EV pitch when P ₁ Mode As can be seen from this figure, also the exposure time side when the P ₃ modes 1EV
It is displayed so that the display dots are aligned in a pitch and are aligned. Table 1 shows the transition of each function and each mode. The modes in the double frame are initialized at the time of power-on reset at the time of battery replacement. The operation procedure for each mode in each function will be described.

Figure 9 represents a P ₂ mode EXPOSURE function. FUNC by the key (6) "" to move the mark to select the EXPOSURE function, by then MODE key (7) of the mode name displayed on the character display unit (16) "put out the PROGRAM2" display, the P ₂ mode Set. EXP
The “▼” mark is lit above the “P” in the mode display section (18) of the OSURE function. Graphic display (2
In 4), control the camera shutter speed 1
The program line is limited by / 4000 seconds and 30 seconds and lens control limits F1.4 and F22. Also, the slope of the program line passes the point of F5.6 at 1/250 second in the initial setting state. Next, press the OPE key (8), EXPOSURE
The function is in the execution state, as shown in Fig. 10. The mark (21) lights up and the EV line (2
5) appears. Next, when the ENT key (9) is pressed, the mode is switched from each mode display ("PROGRAM2") to a control display (hereinafter referred to as OUTPUT display). In this case, the shutter speed value 1/60 second and F2.8, which are the intersections of the program line and the EV line, are displayed on the character portion (FIG. 11). In the OUTPUT display, the slope of the program line can be shifted by the UP key (11) and the DOWN key (12). 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. Thirteenth
In the figure, the FMAX value indicates F22 for the initial setting. DOWN
When the FMAX value is lowered to F8 by the key (12), the slope of the program line stops at F8 as shown in Fig. 14,
Restrictions are added. When the setting of the FMAX value is completed, the flow advances to FMIN by the ENT key (9). In FIG. 15, the character display switches to the FMIN value setting. F for initial setting
1.4 is displayed. Use the UP key (11) to change the FMIN value. FIG. 16 shows a state where F2.8 is set. Next, press the ENT key (9).
"ED" is displayed on the character portion. When the completion display appears, the display is switched again to the OUTPUT display by the ADJ key, and the camera control value is displayed on the character display portion (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). UP key (11) for 1 /
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 "A MODE" is displayed on the character display section by the MODE key (7) and A mode is selected, the display is made as shown in FIG. OPE key (8)
Is in the execution state. 30 seconds by camera And is limited by 1/4000 seconds. O by ENT key (9)
When the display is switched to the UTPUT display, an underline is displayed on 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, the display is made 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). When changing from 1/250 second to 1/1000 second by UP key (11), it becomes 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. When "M MODE / LT" is displayed on the character display section by the MODE key (7) and the long time mode is selected, the display is made as shown in FIG. 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 press INPUT with ADJ key (10)
When the display is changed to a display, a shutter speed value can be set as shown in FIG. The setting range of the shutter speed value (long time) is from 10 seconds to 9990 seconds, and can be set in units of 10 seconds. The underline is initially set at the thousands digit, and then shifts to the hundreds digit, the tens digit, the first digit, and again to the thousands digit, and the UP key (11) or DOWN, respectively.
The numerical value is changed by the key (12) (FIGS. 33 and 34).
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). Camera control values are displayed on the character display section (FIG. 35).

Next, an AVERGE mode for performing an average calculation of a MULTI · M (multimetering) function will be described.
This MULTI · M function can be set by the FUNC key (6) when the EXPOSURE function is in the execution state. FUNC when EXPOSURE function is in execution state
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 mode of the EPOSURE function is set to the 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 shows an index indicating the deviation width during highlight calculation and shadow calculation. And an index display (“■■■■”) indicating that it is not linked is displayed on the left and right. 1 that is one step above the index in the middle
The point display (“■”) is the first photometry point, and is usually located at the center (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 photometric point captured in a state of being AE lock, the character display unit (16), is calculated in the mode selected by EXPOSURE function (this is a P ₂ mode) The shutter speed and aperture value are displayed. When the M key (14) is operated again, the value of the second photometry point is fetched, the first and second photometry points move to a state of being balanced on the basis of the 0 position, and the first and second photometry points are displayed on the character display section. a second photometric point value average calculation, and a shutter speed value at P ₂ mode,
The aperture value is calculated and displayed (FIG. 39). This is also the third
Are shown at the upper stage of the index display. Hereinafter, by operating the M key (14) sequentially, photometric values can be captured and displayed up to 8 points.
From the ninth point, the first point is replaced with the first point, and the latest eight photometric points can be acquired and calculated. FIG. 40 shows a state in which three photometry points have been captured, and FIG. 41 shows a state in which the maximum eight photometry points have been captured. 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 in which the average of the MAX value and the MIN value of the photometric value is calculated. Moves to a balanced position (FIG. 42). Next, the ENT key (9) is used to display OUTPUT, and the shutter speed value and aperture value calculated in the character display area (16) are displayed between CENT and CENT.
“C” in the ER mode is displayed (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 indicating the maximum value of the acquired photometry point moves so that it is at the position of +2.3 Ev, and the MAX
The entire metering point display taken in based on the point display indicating the value moves (FIG. 44). At this time, minus 6E
The number of photometric points that extend beyond v are displayed at the position of minus 6Ev. Next, the ET key (9) is used to display OUTPUT, and the shutter speed value and aperture value calculated based on the highlight standard and “H” in the HIGHLIGHT mode
Is displayed on the character display section (FIG. 45). Again
By the MODE key (7), the mode is changed to the SHADOW mode, and the mode name display of "SHADOW" is displayed on the character display section. At the same time, the point display indicating the MIN value of the photometry point that has been captured moves so as to be at the position of -2.7 Ev, and the entire display of the photometry point display that is captured based on the point display that indicates the MIN value moves (No. 46). 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, the output is displayed by the ENT key (9), and the shutter speed value and the aperture value calculated based on the shadow standard, and "S" in the SHADOW mode are displayed on the character display portion therebetween (FIG. 47).
When the MODE key (7) is operated again and again, the mode returns to the AVERAGE mode again, and is sequentially repeated. The MULTI · M function has another mode in addition to the mode described above. When the EXPOSURE function is in the M (manual) mode, the MULTI / M function is in the MANUAL mode, and the MODE key (7) is invalid without any other mode.
In the MANUAL mode, the control value is the set value in the M mode of the EXPOSURE function, and the 0 position of the index display is the set value. Therefore, the photometric value from the camera exists at a position shifted by the amount of deviation from the set value as shown in FIG. The output is displayed by the ET key (9), and the shutter display value and the aperture value which are the set values are displayed on the character display section (16), and "M" is displayed therebetween (FIG. 50). Since it is in the execution state by the OPE key, the photometry point is 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). 54th
In the figure, since the shutter speed value display section has an underline, the shutter speed value is changed at the same time as the photometric distribution diagram is moved by the UP key (11). Therefore, with this function, it is possible to perform exposure control according to the luminance distribution of the subject, and furthermore, 2.3Ev, 2.7Ev
The width of the highlight and the shadow exposure fixed to are also arbitrarily changeable. 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. That is, the MANUAL mode of the MULTI / M function can be said to be a kind of metered manual in a generally known manner.

Next, the BRACKET (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 state of the mode name display, indicating that the P mode has been selected with the EXPOSURE function, and the start value of shift and an index indicating the shift amount are displayed at the top of the graphic display section (24). Have been. This indicator is MLTI
It is common to the one that indicates the photometry range of the M function, but it is also possible to provide another common object. An index indicating the shift range is displayed on the graphic display unit. Also, the BRACKET function is in a non-executing state. Press the ENT key (9) to set 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.
Also, the execution state is activated by the OPE key (8), so that a new display indicating the operation state of the BRACKET function appears within the same shift range below the index on the graphic display section (24). Next, press the OUTPU with the ADJ key (10).
When the display is changed from the T display to the INPUT display, first, a message "FROM" appears on the character display section (16) so as to set a shift start value, as shown in FIG. Here, enter the underlined value with the UP key (11).
Alternatively, when the desired value is changed by the DOWN key (12), the index and the operation display move as shown in FIG. 58 together with the key input. Next, the message "STEP" for setting the shift width is displayed by the ENT key (9) on the character display section (1).
6) (Fig. 59). The shift width is 1 / 4Ev, 1 / 2Ev, 1E
Select from 4 types of v, 2Ev, UP key (11) or DOW
Use the N key (12) to change and set the underlined numerical value (Fig. 60). Next, a message "FRAME" appears on the character display section by the ET key (12) so as to set the number of frames to be shot as shown in FIG. UP
When the numerical value with the underline is changed and set by the key (11) or the DOWN key (12) (9 frames in this case), the width of the index and the operation display on the graphic display section is shifted. The shift range is displayed continuously from the value to the final value of the shift (No. 62
Figure). 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. With the ADJ key (10), the display changes from INPUT display to OUTPUT display,
The character display (16) shows the amount of deviation from the reference value,
The number of remaining frames is displayed (Fig. 64). Next, when the camera is released, the metering value at that time is locked, and the exposure value of each frame shifted based on the metering value is set to the mode selected by the EXPOSURE function. _1, the shutter speed value computed by P one of modes _2, P ₃₎ and is converted by the aperture value, the camera is controlled. 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 to indicate that there is only one frame left.
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 BRACKET function is executed, the display on the external display (2) is changed to the EXPOSURE function and the BRACKET function is executed. If the EXPOSURE function selects P, S, A, the Ev The line moves in parallel on the program line, and when M mode is selected, the aperture value line moves in parallel, so it is easy to execute the BRACKET function. You can check.

Next, the imprint function will be described. FUNC
When the imprint function is selected by operating the key (6), the mode is changed to the exposure control data imprint mode, and when the OPE key (8) is operated, the operation state is set. 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
When 0) is pressed, the data can be changed, and a cursor is displayed on the year data display section (FIG. 73). When the cursor key (13) is pressed twice, a cursor is displayed below the day data display section. FIG. 75 shows the state in which the day data is changed from 12th to 15th by pressing the UP key (11) three times. is there. 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. In this state, every time the MODE key (7) is pressed, the printing mode is changed in the order shown in Table 1, and the mode is changed to the hour / minute / second mode.
When the MODE key (7) is further pressed, an 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. When the ADJ key (10) is pressed, a cursor is formed, and data corresponding to the position of the cursor can be changed with the up key (11) and the down key (12). With the up key (11), 0 → 1 →…
Down key (12) in the order of → 9 →-→ blank → 0 ...
Then it changes in reverse. FIG. 79 shows the state in which the data change is completed in this way. In this state, the ENT key (9)
Pressing will move the cursor 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. Hereinafter, initial data is set in the same procedure as in the upcount mode, and the display at the end of the setting is shown in FIG. 82. 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) Combine up key (11) and down key (12) to change 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. In this function, mode switching and the like cannot be performed, and the setting state of the imprint 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 photographing (hereinafter, referred to as the number of frames), the number of times the interval is repeated (hereinafter,
Group number) and the first release start time of the interval shooting (hereinafter referred to as a 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. Also, the graphic display section (24) is in a state where no display is made in this function. When this interval function is set to the execution state by the OPE key (8), the execution is started toward the start time. When the first release of the interval is to be executed immediately, the operation is to be executed by the OPE key (8) and the camera is released.
The start time has been canceled and you can start again. Next, press the ADJ key (10) to
The display changes from the UTPUT display to the INPUT display, and first, as shown in FIG. 90, a display state is set in which the interval time can be set. The character display (16) displays “I” for the INTERVAL time, and indicates “H (Hour), M (Mi
nute), S (Second) "is displayed along with the numerical value. The underline indicates the position where the numerical value can be changed, and the numerical value can be changed with the UP key (11) or DOWN key (12). The interval time can be set from 0 second to 99 hours 59 minutes 59 seconds by moving the changed portion by the cursor key (13) (FIG. 91), and then the ENT key (9). Changes to the setting display of the number of frames ("F") and the number of groups ("G") as shown in Fig. 92. Use the UP key (11) or DOWN key (12) to change the underlined numerical value. Make the change and move the changed part with the cursor key (13) to set the number of frames and the number of groups (Fig. 93) .The number of frames can be set up to 9 frames at maximum, but the above Is set, the BRACKET function The priority is given to the number of frames, and the number of groups can be set up to 99. Then, the ENT key (9) changes to the start time setting display as shown in Fig. 94. Can be set to what day, what time, and what time. The character display (16) displays “S” for the START time, and indicates “D (Da
te), H (Hour), M (Minute) "are displayed along with the numeric value.
Alternatively, the start time is set by changing with the DOWN key (12) and moving the changed portion with the cursor key. 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).
The key (10) changes the display from INPUT to mode 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. Then, after the first release of the interval is executed, the remaining time until the next release is displayed in hours, minutes, and seconds ("H, M, S") on the character display section (16) ( (Figure 97).

FIG. 98 is a block diagram showing a specific example of the back circuit (BCKC). (CMC) is a control microcomputer for setting functions, modes, data, exposure calculation, creation of display data, creation of imprint data, and control of imprint operation by key input. Further, a display unit (S
D), (DD), (CD) control, calendar microcomputer (CAM)
C) and exchanges data with the display microcomputer (DMC) and exchanges data with the camera body (BD). (CAMC) is a calendar microcomputer, which also performs calendar data for printing, interval control, long exposure time (long time) control, and the like.

The switch (M) is a switch that is closed by pressing the memory key (14) in FIG. 5, 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 closed by operating the up key (11). (DWN) is a switch that is closed by the operation of the down key (12). These six switches are connected to each input port of a control microcomputer (CMC), and are connected to an interrupt terminal (INTB) via an AND circuit (AG). 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 a switch that is closed in conjunction with the operation of the operation key (8), the (FUN) is a switch that is closed in conjunction with the operation of the function key (6), and (ADJ).
Is a switch that is closed in conjunction with the adjustment key (10), and (MOD) is a switch that is closed in conjunction with the operation of the mode key (7). Since these four switches are connected only to the input ports of the control microcomputer (CMC), the control microcomputer (CMC) is not started even when 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) in FIG.
First, the signal line (CSB) from the camera body (BD)
w "When falling to start the operation from No.0 step by interrupt pin (INTA). First, because the camera is activated signal line (BS _1)" and High ", then the interrupt pin (IN
TA) to enable the interrupt operation, and then the camera body (BD)
It is determined at which timing the interrupt signal is input. That is, in the step of No. 2, it is determined whether or not it is in a state of waiting for data input. Determined in step .3. This is because, as described above, when the signal line (CSB) falls to “Low”, the signal line (BIO) is set to “H” for arithmetic data.
igh "and" Low "for imprinted data, so it can be determined. When it is determined that imprinted data is input, the transmitted data is read and the No. 5 It is determined whether or not the imprint function is selected in the step.If it is determined in the step No. 5 that the imprint function is not selected, the process proceeds to the step No. 15 without performing the imprint operation. On the other hand, if the imprint function is selected, the process proceeds to step No. 6 and sends data corresponding to the selected imprint mode to the driving circuit (LDR) of the imprinting LED. A synchronization signal is sent to the signal line (CSLD), and data is sequentially sent in 4-bit units.
When EN) is set to “Low” and the display operation of the drive circuit (LDR) is operated, the light emitting diodes (LEDs) of the segment are dynamically driven according to the imprint data, and imprint 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 B & W function, counting of a different (long) time is performed even if the read film sensitivity is the same data as the imprint function. And
When the counting is completed, the signal line (LDEN) is set to “High”, and the driving operation by the drive circuit (LDR) is stopped.
When the rear curtain starts running on the camera body (BD), a “Low” pulse is output to the signal line (CSB). Therefore, at this time, an interrupt signal is input to the interrupt terminal (INTA).
Go to step. Then, when it is determined in step No. 11 that the imprinting operation is being performed, the process proceeds to step No. 10 and the signal line (LDEN) is set to “High” to forcibly stop the imprinting operation. . This prohibits the printing operation from being performed even during film winding. No.15
In step, the switch (SCN) of the camera body is “ON”
Determine whether or not. If the switch (SCN) is "ON", the operation of the steps No. 16 to 21 is not performed and No. 40
Go to step. On the other hand, the switch (SCN)
If "F", then it is determined whether or not the mode is the count-up mode. If the mode is the count-up mode, "1" is added to the register CR in which the imprint data is set, and the process proceeds to No. 40. If it is not the count-up mode, it is next determined whether or not it is the count-down mode, and if it is the count-down mode, "1" is subtracted from the content of the register CR and the process proceeds to the step of No. 40.
If it is not the countdown mode, then it is determined whether or not it is a bracket function. No.4
Move to step 0. When the switch (SCN) is set to “O
Even when the value is "N", the data is printed. However, the switch (SCN) is determined between steps No.4 and No.5, and if the switch (SCN) is "ON", No.40
It may be made to shift to the step of.

No imprint data in No.3 step (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 to become. 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”, and the signal line (CSB) is kept at “Low”.
When a sufficient time elapses for performing the operation, the signal line (BIO) is set to “Low”. 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 operation is completed, wait for the signal line (BIO) to go to "Low". When it goes to "Low", the control data (Tv, Av), exposure control mode, out-of-coupling, release enable / disable data, etc. To step No.40.

When the control microcomputer (CMC) is started by the pulse output to the signal line (CSB) when the camera body (BD) starts operating, or when the rear curtain starts running, the pulse is input. If the function is not the imprinting function or the imprinting operation is completed, the process immediately proceeds to No. 40 step. Switch (M),
(CL), (CUR), (ENT), (UP), (DWN) are set to “ON” and an interrupt signal is input to the interrupt terminal (INTB), or an interrupt is generated by the interrupt terminal (INTA). No.40 when the operation by
The operation from step is started. In step No. 40, the timer TIR (for counting the operation time) is reset, the flag IOF that determines whether data is input or output from the calendar microcomputer (CAMC) is set to "1", and N
Move on to step o.42. In the step of No. 42, it is determined whether or not the flag IOF is “0”. If “1”, the data from the calendar microcomputer (CAMC) is read, the flag IOF is reset to “0”, and the step of No. 47 is performed. Transition. On the other hand, when it is determined in step No. 42 that the flag IOF is “1”, the data is sent to the calendar microcomputer (CAMC), the flag IOF is set to “1”, and the process proceeds to step No. 47. I do. The data transmission / reception method is as follows: set the signal line (CSCA) to “Low”, and output
O) is “Low” and the signal line (I
/ O) is set to “High”. When the signal line (CSCA) becomes “Low”, the calendar microcomputer (CAMC) is interrupted, and a pulse for data transfer synchronization is output from the calendar microcomputer (CAMC). In synchronization with this pulse, 4-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) includes the current year, month, day, hour, minute, second, and the time until the start of the next shooting operation for interval shooting.
Minutes, seconds, and whether interval shooting is active,
There is data or the like indicating whether or not the interval shooting has been completed. Therefore, the control microcomputer (CMC) creates the imprint data based on these data, creates the remaining time display data until the start of the next shooting operation at the time of the interval function, and inputs the interval end signal. Then cancel the interval function. The data sent from the control microcomputer (CMC) to the calendar microcomputer (CAMC) includes the start date, hour, minute, and hour, minute,
There are data such as seconds, the number of groups for interval shooting, the number of frames for interval shooting, the set exposure time in the M / LT mode, whether the interval function is selected, and whether the M / LT mode is selected.

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

When the operation of the subroutine of the step No. 48 and the operation of the step No. 49 is completed, the reception of the interrupt signal to the interrupt terminal (INTA) is enabled, and the display data is sent to the display microcomputer (DMC). In this operation, first, the signal line (DEN) is set to “Low”.
The display units (SD), (DD), and (CD) are in the operating state as
Next, the signal line (CSDM) is set to “Low” to cause data to be output to the display microcomputer (DMC), a synchronization pulse is output from the signal line (DCK ₂ ), 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, the signal line (DEN) is “Low”.
, Power is supplied to the display units (SD), (CD), and (DD).

When the data transfer is completed, it is determined in step No. 52 whether any of the switches (M) to (MOD) is "ON", and if it is "ON", the register TIR is reset. If none of the switches are turned "ON", "1" is added to the contents of the register TIR, and the routine proceeds to the step of No. 55. Then, in the step of No. 55, it is determined whether or not the content of the register TIR has reached the constant value "K", and if not, the process shifts to the step of No. 42 and the same operation is repeated. If it is determined in step No. 55 that the content of the register TIR has reached "K", key operation or data exchange with the camera body (BD) is not performed, and a certain time has elapsed. At this time, the signal line (DEN) is set to “High” to stop the operation of the display unit, and the operation by the interrupt signal to the interrupt terminal (INTB) is enabled to stop the operation.

FIG. 100 is a flow chart showing a specific example of the calculation subroutine of No. 29 in FIG. 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 captured. If the data has been captured, the external function is set, and the data from the meter (MET) is set 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), it is next determined whether the mode is the M or M / LT mode. If the mode is set, the manually set Tv and Av are output. on the other hand,
If the mode is not the M, M / LT mode, it is determined whether or not the multi-function is selected. If the multi-function is selected, the control Ev value is calculated based on the stored Ev value.

The subroutine for the 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 the mode is the highlight mode. If the mode is the highlight mode, the control Ev is calculated by performing Evmax−2.3 on the maximum value of the stored 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 not in shadow mode, it is average mode, in which case To calculate the control Ev.

In FIG. 100, when the multi-function is not selected, Ev from the camera is set as control Ev. Then, based on the obtained control Ev, an operation is performed according to the mode selected from 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, first, when Evmax (= Tvamx + Avmax) <Ev, Evmin (= Tvmin + Avmin)> Ev, the limit value is set as the control value because the control is not interlocked, and the non-interlock flag is set, and the process 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". 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, and in the M, M / LT mode, the aperture value is moved by the number of frames of the shift amount (the number of times of the next shooting).
Reset the A flag.

_{Meanwhile, P 1, P 2, P} 3, A, moves the Ev by the number of frames of the shift amount in the S mode, the process proceeds to reset the A flag Tv, the calculation subroutine Av. In this way, Tv, 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, if it is set to “Low”, to prevent the shooting operation from being performed,
The release disable signal is set, and if the above conditions are not satisfied, the release disable signal is reset and the process returns to the main routine.

FIG. 105 is a flowchart showing the operation of the calendar microcomputer (CAMC). First, when the signal line (IP) is set to “Low” at the start of the exposure control operation on the camera body (BD),
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 or not it is interval shooting, and if it is not interval shooting, it is next determined whether or not the M / LT mode is set. 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 it is interval shooting, the remaining time until the start of shooting of the interval 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 the content of the register IFR is not “0”, the process proceeds to step ST20. On the other hand, the content of the register IFR is “0”
Then, the register IGR where the number of groups is set next
Is subtracted from “1” to determine whether or not “0” has been reached.
If it is "0", an interval end signal is set, and if it is not "0", the remaining time is set. Then, it is determined whether or not the M / LT mode is set. If the mode is not the M / LT mode, the signal line (BS ₂ ) is set to “High”, and the M / LT mode is set.
If the mode is the mode, the process proceeds to step ST20 while the signal line (BS ₂ ) remains “Low”. And the interrupt terminal (INTA), (IN
TB), 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. Meanwhile, the flag
If TIF is "0", the operation stops.

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 the data is input, the data from the control microcomputer (CMC) is read in step ST27. Then, if the M / LT mode is selected and the M / LT mode is not operating, the exposure time data is set, and if the M / LT mode is not selected or the counting is being performed in the M / LT mode, ST30 is set as it is.
Go to step. In step ST30, it is determined whether or not the interval function has been selected and is in an operating state. If the interval function has not been selected or is in operation, the process directly proceeds to step ST20. On the other hand, when the interval function is selected and the operation has not started, the number of frames is set in the register IFR, the number of groups is set in the IGR, the time interval between groups (remaining time), the start time is set, and the step ST20 is executed. Transition. 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 a timer interrupt occurs every second, the operation from step ST40 is started. If the operation is being performed by the interrupt terminals (INTA) and (NTB), the flag TIF is set to "1" to slow down the operation up to that point. Return. 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. In step ST45, an operation of rewriting the calendar by increment of one second is performed. Then, it is determined whether the M / LT mode is operating. If the M / LT mode is operating, "1"
Is subtracted to determine whether or not 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, if the content of the Tv timer is “0” in step ST48, the signal line (BS ₂ ) is set to “High”, and the rear curtain of the camera body (BD) is started, 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.

If it is determined in step ST55 that the interval function has been selected, the process proceeds to step ST56, where 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 next determined whether or not “Low” is output to the signal line (BS ₂ ).
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 is before starting the shooting operation of the interval shooting or between groups, and in this case, the remaining time until the start is calculated.
Move on to step ST62.

Next, a graphic display block consisting of a display microcomputer (DMC), LCD segment driver (SD), LCD common driver (CD), LCD drive reference power supply (DD), and liquid crystal display (LCD) is explained. I do.
First, transfer clock (DCK2) from control microcomputer (CMC)
Based on the data, the data (4 bits) shown in Table 2 is transferred to the display microcomputer (DMC) via the data bus (DBUS2), and converted into graphic display data by the display microcomputer (DMC), and the LCD segment driver ( SD). LCD segment driver (SD) is LCD display RAM
, And 1-bit data of the LCD display RAM corresponds to lighting / non-lighting of one dot of a liquid crystal display (LCD). After the graphic display data is transferred to the LCD segment driver (SD), it is written to the LCD display RAM, and an LCD segment drive signal (SGT) corresponding to the contents of the LCD display RAM is sent from the LCD segment driver (SD). Give 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) performs 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)
To supply.

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). It is determined whether or not the mode is the full lighting mode in the step. Normally, the apparatus enters a step interrupt waiting state. The determination of whether or not the full lighting mode is for a disconnection test at a factory. In the full lighting mode, all lighting data is output to an LCD segment driver (SD) (step), and a liquid crystal display (LCD) is performed at the step. ) Is lit, and the system clock is stopped in steps. Normally, that is, when the mode is not the all lighting mode, the CPU enters a step interrupt waiting state and waits for an interrupt from the control microcomputer (CMC). The imprint routine shown in FIG. 107 is a routine for setting a flag for displaying an in-imprint display ("IMP") for a certain period of time during imprinting. Imprint signal from camera (PI)
(Step), the register is saved in the step, the "IMP" display flag is set in the step, and the register is returned to the original main routine in the return step in the 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, restart of the main routine is prohibited, transfer data from the control microcomputer (CMC) shown in Table 2 is input in step, and power supply voltage check is performed in step. If the power supply voltage is lower than the predetermined value, a power supply voltage check flag (BC flag) is set in step. In steps 1 to 3, the transfer data from the control microcomputer (CMC) is decoded into graphic display data.

This decoding is first performed on the character display section (16) (step), and is converted into graphic display data corresponding to each display content such as each mode display, INPUT display, OUTPUT display, etc. (SD) and written to the LCD display RAM in the LCD segment driver (SD) (step). Subsequently, the indicator indicating the control range and the mode display section (18) are decoded in the step,
Output to D segment driver (SD) (step).

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

First, when the exposure function is selected, first, in order to draw the Ev line (25), an 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 in accordance with the line (26)
Is drawn in the procedure from FIG. 109 to FIG. 114. When the P ₁ , P ₂ , and P ₃ modes are selected, the minimum aperture value Avmax of the lens, the maximum aperture value Avmin of the lens, the setting limit value Avn on the small aperture side of the lens, and the maximum aperture value of the lens in FIG. 109 Assuming that the set limit value Avm on the side and the selected slope Avp, Avy is drawn while changing Tvx in the procedure shown in FIG. 110. In brief, first, Tvx = −0.5 is set in a step, and a line segment is drawn in a step. Then, a line segment is drawn while Tvx is incremented (step-). Finally Tv
Draw a line as x = Tvmax (step). The setting lines in the P ₁ , P ₂ , and P ₃ modes, and the calculations in FIG. 6- (26) are as described above. The Avp lines in the P ₁ and P ₃ modes, and FIG. : 1 and 1: slope and draw in the same way as P ₂ mode because it is 2 becomes stage-like, hard to understand. Therefore devised this point in P ₁ and P ₃ mode, points obtained by the calculation (Tvx, Avy) is the manner aligned (the 6,8
See figure). FIG. 111 shows how to draw a setting line in the S mode, where Tvn is a setting shutter speed.
Avy = Avmi while incrementing Step ~ Tvx
Draw a line (line segment) of n, then draw a line (line segment) of Tvx = Tvn, draw a line segment with Tvx = Tvn (step), and finally, increment the Tvx again, Avy
= Draw a line (line segment) of Avmax. FIG. 112 shows how to draw a setting line in the A mode, where Avn is a setting aperture value. Set Tvx = -0.5 in step ~, draw a line segment, and increment Tvx in step
= Avn line (line segment), Tvx = Tvmax in steps
And draw each line segment. Fig. 113 shows how to draw a setting line in M mode.
Av = Avn line (line segment) while incrementing Tvx by Av = Avmin with Tvx = Tvn in step
Draw a line (line segment) up to Avy = Avmax. Where Avn,
Tvn is a set aperture value and a set shutter speed value, respectively.

Fig. 114 shows how to draw a setting line in M / LT mode. In step ~, set Tvx = -0.5, and from Avy = Avmin to Avy
Draw a line (line segment) of Avy = Avn while incrementing Tvx in a step (line segment) up to = Avmax. 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 operation of the graphic display unit when the multi-function 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 (2
2), the index (23) indicating the aperture value is decoded so as to be turned off. In Table 4, the Ev value controlled automatically is Ev
c, assuming that Ev currently being photometered is Ev ₀ and the number of stored data is n, the point P ₀ (PE
v ₀ , yo) and then the line L ₀ (step). The point Pn (△ Ev
n, ym). However, 1 ≦ n ≦ 8, 2 ≦ m ≦ 9. This situation is shown in the flowchart of FIG. The following is an operation method of the graphic display unit in the multifunction.

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 Table 4, assuming that the current point is △ EvCONT and the setting start point is △ EvSET, the 116Evma
Find x, and in steps ス テ ッ プ Evx = △ EvSET to △ Evx = △ Ev
Draw a line (LSET) up to max, and in steps △ Evx =
Draw a line (LCONT) from ΔEvCONT to ΔEvx = ΔEvmax. The above is the calculation method of the graphic display unit of the bracket function.

As described above, when the operation of the graphic display unit is completed, the process proceeds to the step of FIG. 108, where the symbol (2
0) is decoded and output to the LCD segment driver (SD) in steps together with the decoding results in steps and the calculation results in steps. In the steps (1) to (4), the "IMP" flag indicating that copying is in progress is tested, and if set, "IMP" is decoded into a sub-character and output to the LCD segment driver (SD).

In this way, when all the graphic display data are decoded and serially transferred to the LCD segment driver (SD), the liquid crystal display (LCD) is turned on (step) and the processing of the display microcomputer (DMC) 1 End the loop. After that, it enters the standby state for the interrupt signal (CSDM) from the control microcomputer (CMC), and then again enters the interrupt signal (CSDM)
Is sent, the display microcomputer (DMC) starts the main routine again, and enters the processing for the next graphic display from the above steps.

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, power is supplied to the calendar microcomputer from two 3 volt power batteries (B) to control and display microcomputers (CMC) and (DMC).
Is supplied with power from a four 6 volt power battery (A). Then, a battery check by the display microcomputer (DMC) (steps shown in FIGS.
Check both power batteries. When the power supply battery of (A) is useless, the symbol (A) and four batteries are displayed on the graphic display section (24) as shown in FIG. 117, and when the power supply battery of (B) is useless. Indicates a symbol (B) and two batteries as shown in FIG. 118.

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,
There are three cases (a), (b), and (c) as shown in FIG. 119. 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 FIGS. 119 (a) and (b) depends on how the shutter speed value and the aperture value are rounded 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. Thereby, the inclination of the aperture value with respect to the shutter speed value becomes clear. 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 (25) will be described. In the present embodiment, the display range of the liquid crystal display (LCD) is set such that the shutter speed value is Tv ≦ 11 and the aperture value is Av ≧ 0.5.
Indices for ≦ −0.5 and Av ≧ 9.5 It is not accurate because it is represented by 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 (26) is displayed in the range of Tv ≦ 11, Av ≧ 0.5. By doing so, the control point, which is the intersection of the setting line (26) and the Ev line (25), has a shutter speed value of 11
Only an accurate range of ≧ Tv ≧ 0 and an aperture value of 0.5 ≦ Av ≦ 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 a step, and Avy = Ev−Tvx is obtained in a step. However
Ev is an automatically controlled Ev value of data Nos. 14 to 15 in Table 2 and is a value sent from the control microcomputer (CMC).
In the step, it is determined whether or not 0.5 ≦ Avy <9.5 (1.2 ≦ F <27), and if it is within this range, the point (Tvx, Avy) is plotted (step). In step, Tvx is incremented by 1 Ev step, and in step, Tvx> Tvmax (Tv = 11) is determined. If NO, the process returns to the step and repeats the following steps. When YES, that is, when Tv> Tvmax, the process proceeds to the step and ends. Note that the step of incrementing Tvx may be 0.5 Ev step.

In FIG. 1, the control microcomputer (BMC) of the camera body (BD) includes serial input / output terminals (SOU), (SIN), (SC
K) through all remaining circuits (flash device (F
L), receiver (REC), display unit (DSP), lens circuit (LEC), AF circuit (AFC), back circuit (BCKC), A-D,
Data is exchanged with a DA converter (ADA). Therefore, if the serial input / output terminal is monitored while the system is operating, and the data read by monitoring is checked and compared with the operation of the camera system, it is determined whether the system is operating normally. Check can be done.
Therefore, the serial input / output terminals (SOU), (SIN), (SC
K) comes out of the camera body (BD) to the terminals (T ₁ ), (T ₂ ) and (T ₃ ) for the back circuit (BCKC) and the terminal (LC) for the lens circuit (LEC). T _11), there is _{(T 12), (T 13} ). And all the terminals are the back circuit (BCKC) terminals (T1), (T2), (T3)
What is necessary is just to enable the checker to be mounted at the position of the back circuit (BCKC). Then, from the checker side, the microcomputer (BMC) outputs a “Low” signal whose impedance is lower than the “High” signal output to the signal line (CSB), forcing the signal line (CSB) to “ If it is set to "Low", the gate circuit (G ₂ ) is always in the active state, and it is possible to check data transfer with circuits except the back circuit (BCKC). The back circuit (BCKC) can be checked to some extent at the terminals (T ₁₂ ) and (T ₁₃ ) for the lens circuit (LEC).

Effects As described above, according to the first and second aspects, one is activated in response to a manual operation of one (for example, a camera accessory), and the other (camera body) is automatically activated in response to the activation. With this configuration, the user does not need to remember which operation should be performed unlike the conventional activation device. Also, regardless of which operation is performed, both are automatically activated, so that the activation operation is simple. And even if both are in the non-activated state, since it is activated in both by manual operation of only one, it is possible to activate the entire camera system immediately without having to specially prepare, and after activation, Both parties can communicate with each other and immediately achieve the function corresponding to the manual operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the entire camera system to which the present invention is applied, FIGS. 2 and 3 are flowcharts showing the operation of a microcomputer (BMC) of the camera body (BD), and FIGS. FIG. 6 to FIG. 8 are views showing display examples of the display unit (2), FIG. 9 to FIG. 35 are views showing the relationship between key operation and display in the exposure function, and FIG.
FIG. 36 to FIG. 54 are diagrams showing the relationship between key operation and display in the multi-function, FIG. 55 to FIG. 68 are diagrams showing the relationship between key operation and shooting operation in the bracket function and display, and FIG. 69 to FIG. FIG. 88 is a diagram showing the relationship between key operation and display in the imprint function, and FIGS. 89 to 97
The figure shows the relationship between key operation and shooting operation in the interval function and display. FIG. 98 shows the back circuit (BCK
FIG. 99 to FIG. 104 are flowcharts showing the operation of the control microcomputer (CMC), FIG. 105 is a flowchart showing the operation of the calendar microcomputer (CAMC), FIG. 106 to FIG. Is a flowchart showing the operation of the display microcomputer (DMC). FIGS. 109 and 110 are diagrams showing a method of displaying a program line in the P mode. FIGS. 111 to 114 are S, A, M, M / LT. FIG. 115 is a diagram showing a display method in a multi-function, FIG. 116 is a diagram showing a display method in a bracket function, and FIGS. 117 and 118 are power supply batteries. FIG. 119 is a flowchart showing a display example at the time of lowering, and FIG. 119 is a flowchart showing a display method of an Ev line. BD: camera, BCK: camera accessories, BMC: the camera control circuit, CMC: accessory control circuit, AN, INT _0: first activating means, AG, INTB: the second activating means, OP _15, CSB: third activating means , T _7, BS: fourth activation means, S1, S2, SMO, SIS , SOR, ST, SA: camera side operation unit, M, CL, CUR, ENT , UP, DWN: accessory-side operation unit.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication location G03B 17/14 G02B 7/11 N (72) Inventor Masaaki Nakai 2--30 Azuchicho, Higashi-ku, Osaka-shi Osaka International Building Minolta Camera Co., Ltd. (72) Inventor Takanobu Ohmaki 2-30, Azuchicho, Higashi-ku, Osaka City Osaka International Building Minolta Camera Co., Ltd. (72) Inventor Nobuyuki Taniguchi 2-30 Azuchicho, Higashi-ku, Osaka City Address: Osaka International Building Minolta Camera Co., Ltd. Examiner Shujiro Yokobayashi (56) References: Japanese Utility Model Application Sho 54-21539

Claims (2)

(57) [Claims] 1. A camera system comprising a camera body and a camera accessory selectively mounted on the camera body and electrically transmitting and receiving data and signals between the camera body and a camera accessory provided on the camera body. A camera control circuit that controls the operation and can take a non-start state with relatively low power consumption and a start state with relatively high power consumption; and An accessory control circuit capable of taking a non-starting state with low consumption and a starting state with relatively large power consumption; camera-side operating means provided in the camera body and manually operated; and the camera-side operating means provided in the camera body First activation means for outputting a signal for changing the camera control circuit from the non-activation state to the activation state in response to the operation of An accessory-side operating means provided in the camera accessory and manually operated, and a signal for outputting a signal for changing the accessory control circuit from a non-activated state to an activated state according to a manual operation of the accessory-side operating means provided in the camera accessory. 2
Activating means provided in the camera body, and responsive to activating the camera control circuit by the first activating means, outputting a signal for changing the accessory control circuit from a non-activated state to an activated state; A fourth starting unit provided in the camera accessory and outputting a signal for changing the camera control circuit from a non-starting state to a starting state in response to starting of the accessory control circuit by the second starting unit; The circuit exchanges information with a camera accessory to perform control according to the operation of the camera-side operation means, and the accessory control circuit exchanges information with the camera body to perform control according to the operation of the accessory-side operation means. A starting device for a camera system, which is replaced. 2. In a camera accessory selectively mounted on a camera body, the operation of the camera accessory is controlled so that a non-start state in which power consumption is relatively small and an activation state in which power consumption is relatively large can be taken. An accessory control circuit; an operating means; an activation means for activating the accessory control circuit from a non-activated state to an activated state in response to a manual operation of the operating means; and a camera in response to activation of the accessory control circuit by the activation means. Output means for outputting a signal for activating the main body to the camera main body, wherein the accessory control circuit exchanges information with the camera main body to perform control according to the operation of the operation means. Activating device for camera system.