JPS6254238A - Display device for camera - Google Patents

Abstract

PURPOSE:To display control data even by an absolute scale or a relative scale by displaying by the absolute scale at the time of first mode and by the relative scale at the time of second mode. CONSTITUTION:When the control data are displayed by the displaying member, the data are displayed in accordance with the first mode to calculate a single control data or the second mode to calculate plural control data based upon the photometry data. Namely, at the time of the first mode, for example, the axis is scaled by the exposure time or the closing value, the calculating control data are displayed by the absolute scale, and at the time of the second mode, with the axis as the relative scale, the calculating control data are displayed as the deviation quantity with the special control data in accordance with the photometry value. The special control data may be one of the calculating control data and may be the intermediate value or the average value out of all data.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a display device for a camera that displays exposure control data calculated based on photometric data.

Conventionally, exposure control data (for example, exposure time) calculated based on photometric data is generally displayed on an absolute scale in relation to the exposure time scale in the - column. In addition, in the case of partial photometry, multiple desired parts of the subject are spot-metered using a spot photometry optical system and stored, and control data based on each stored value is displayed on a relative scale as the amount of deviation from specific control data. For example, JP-A-55-12
No. 7542.

,・L α However, when configuring the camera so that various photometry modes and exposure control modes can be selected, there is a mode suitable for absolute scale display and a mode Y suitable for relative scale display, so It is impossible to display the necessary information in each mode using only one display. Therefore, it is conceivable to provide these two types of displays on the camera and select the display according to the mode, but this is not practical because the area occupied by the display part becomes large and operations are required to select the display. .

The present invention aims to eliminate the above-mentioned disadvantages and provide a display device capable of displaying control data on either an absolute scale or a relative scale.

Means for solving illumination points The present invention provides a first mode for calculating control data based on photometric data, or a first mode for calculating a plurality of control data when displaying control data on a display member. Depending on whether the mode is 2 or not, in the 1st mode, for example, the axis is scaled by exposure time or end value and calculated control data is displayed on an absolute scale, while in the 2nd mode, the axis is set as a relative scale and the calculated control data is displayed as a photometric value. It is characterized in that it is displayed as a deviation amount from specific control data according to the specified control data. Note that the specific control data may be one of the calculated control data, or may be an intermediate value or an average value of all the data.

The calculated control data is visually displayed by the display means on an absolute scale in the first mode and on a relative scale in the second mode.

Figure 1 is a block diagram showing the entire camera system to which the present invention is applied. The part (BD) surrounded by a broken line is the camera body, and it is electrically connected to the camera body (BD) from the terminal (T1).
(BCKC) connected via (I9) has data imprint function, interval shooting function, camera body (
This circuit has arithmetic function for exposure control of BD).This circuit is installed on the back cover of the camera, and from now on, this circuit (BCKC)
) is called the back circuit. Also, this buck circuit (BCKC
) is called the camera back (BCK).

This back (BCK) is replaceable and detachable from the camera body (BD). A II lid not provided with the circuit having the above-mentioned function can also be attached in place of this bag (B CK ).

The configuration and function of this buck (B CK ) and the buck circuit (BCKC) will be described later.

Switch (S,) and terminal ('rh) of camera body (BD)
#l& (MDR) via o) is a motor drive device (hereinafter simply referred to as motor drive), and when the exposure control operation is completed, the switch (S4) is turned "ON".
Then, the motor in the motor drive (MDR) starts rotating, and a mechanical interlock mechanism winds the film and charges the exposure control mechanism. Then, when charging is completed and the switch (S,) turns "OFF",
The motor in the motor drive (MDR) stops rotating. This motor drive (MDR) is attached to the bottom of the camera body via a coupling mechanism, and when this motor drive is not attached, charging of the exposure control mechanism and film winding are performed by a manual winding lever. Note that this motor drive (MDR) may be provided within the camera body (BD).

Camera body (BD) and terminals (T I+), (T I2)
, (TI3) is a data output circuit provided within the interchangeable lens. This circuit (LEC) is electrically connected by attaching the interchangeable lens to the camera body. Then, connect the terminal of the camera body (
When C3L) becomes "Lou+", it becomes operational, and various data specific to the interchangeable lens are sequentially output in series based on the reading clock pulse from the camera body (BD). This data includes data for confirming attachment of an interchangeable lens, open aperture value data, maximum aperture value data, focal length data, autofocus, characteristic data for α adjustment, and the like. Details of this circuit, data, etc. are described in, for example, Japanese Patent Laid-Open No. 59-84228 and Japanese Patent Laid-Open No. 59-140408, and will therefore be omitted.

(MET) is an external exposure meter (hereinafter referred to as meter). Camera body (BD) and terminal (T I-L (T 1
5).

The circuit (RFC) connected at (T, 6) is a receiver that receives the infrared light signal sent from the meter (MET). Also, the receiver (RFC) and i
The circuit (FL) connected to the children (T 17), (T 1 , a), (T 2 , 9) is a flash device. The receiver (RFC) is attached to the hot shoe of the camera body (BD), and the 7 lash device (FL) is attached to the hot shoe provided on the receiver (RFC), as shown in Figure 1. It becomes connected.

Note that only the receiver (RFC) or only the flash device (FL) may be attached to the hot shoe of the camera body (BD). Furthermore, the terminal (T
A group of terminals with the same functions as I4), (T I5), and (T I6) are provided on other parts of the camera body (BD) other than the hot shoe (for example, the bottom of the camera), and a 7 lash device (FL) is installed on the hot shoe. Alternatively, one of the flash device (FL) and receiver (RFC) may be directly attached, and the other of the flash device (FL) and receiver (r(EC)) may be attached to the other portion via an adapter.

The meter (MET) can be used as an incident light type or reflected light type exposure meter, and can also measure steady light and flash light. Then, exposure control data is calculated based on the measured value, and this data is emitted as serial light data by the infrared light projection means. In addition to this, the data to be ejected is the flash device fif (
Check whether to test fire the PL) and also check the meter (
There is data indicating whether control data is being sent from (MET). Data from the infrared light sent from the meter (MET) is sent to the receiver (RF
C) and latched as an electrical signal.

Next, the signal lines (S T +), (S T 2), (
The functions of the flash device (FL) and receiver (RFC) related to ST-) will be explained together with the functions of the camera body (BD). First, the signal line (ST,) is a line for transmitting a light emission start signal, and when the X contact (SX) in the camera body (BD) is closed when the front curtain (IC) has completed traveling, the 7 lash device (FL) starts emitting light.

Also, when the receiver (RFC) receives a test emission signal from the meter (MET), the receiver (RFC)
pull this terminal (s'r+) down to “Lou+” and set it to 7.
Start the lash device to emit light. Signal line (ST2)
is for data transmission from the camera body (BD) to the flash device (FL), the flash device (FL), and the receiver (
This is a bidirectional serial data bus for transmitting data from the camera body (BD) to the camera body (BD). Furthermore, a signal indicating that the X contact (SX) is closed and the flash device (FL) has started emitting light is sent from the flash device (FL) to the camera body (
BD).

The signal line (ST3) has a mode in which data is input from the flash device (PL) and receiver (RFC) to the camera body (BD), and a mode in which data is output from the camera body (BD) to the 7 lash device (FL). This is a line that transmits the mode in which the camera body (BD) starts exposure control operation from the camera body (BD) to the 7 lash device (FL) and the receiver (RFC) in pulses at different times. Furthermore, it has a function to transmit synchronization clock pulses for data exchange from the camera body (BD) to the flash device (FL) and receiver (RFC), and also transmits a signal to stop the flash device (FL) to the camera body. (BD)
It has the function of transmitting information from the flash unit to the flash device (FL).

In the camera body (BD), the microcomputer (
When the BMC (hereinafter referred to as a microcomputer) sets the line (C8F) to "Low", the interface circuit (IF) becomes ready to exchange data. And the camera body (
When the BD) inputs data, the microcontroller (BMC)
) outputs a pulse with a first time width to the signal master (FMO), this pulse signal is input to the flash unit (FL) and the receiver (RFC) via the signal line (Sr1), and each Enters data output mode. When a clock pulse for reading data is output from the terminal (SCK) of the microcomputer (BMC), it is output to the signal line (Sr1) via the interface circuit (IF).

First, the flash device (FL) outputs 1 byte of data to the signal line (Sr1), and this data is sent to the microcontroller (BMC) via the interface circuit (IF).
) data input terminal (SIN). This data includes a signal indicating whether the 7 flash device is exclusive to this system, a signal indicating whether the charging voltage of the main capacitor exceeds a predetermined value, a signal indicating whether the flash device is automatically dimmed, etc. be. 2nd, 3rd and 4th bytes are receiver (RF C)
This data is also read from the data input terminal (SIN) of the microcomputer (BMC). The second byte of data is a signal indicating whether exposure control data is being sent from the meter (MET), a test light emission signal, etc. The third byte is exposure time data from the meter (MET), and the fourth byte is aperture value data. When the above data input is completed, the signal line (C3F) becomes “Hi”.
gh”, flash device (FL), receiver (
RFC) will no longer be exchanged.

When transmitting data from the camera body (BD) to the 7 lash device (FL), set the signal line (C8F) to “Low”.
” and outputs a pulse during the second time to the signal line (FMO). Then, the 7 lash device (FL) enters the data input mode, and based on the synchronization clock pulse from the camera body (BD), the microcomputer (BMC) ) reads 3 bytes of data from the data output terminal (SOU).The 1st byte of these 3 bytes is the control aperture value (A v
) and the exposure control mode, the second byte is the sum of the film sensitivity and exposure correction data (Sv+Cv), and the third byte is the focal length (fv) of the interchangeable lens. 1
The data in the 1st and 2nd bytes are used to calculate and display the shooting distance range in which proper exposure is compensated by flash emission, and the data in the 3rd byte is used to calculate and display the shooting distance range that compensates for proper exposure by flash emission, and the data in the 3rd byte is used to calculate and display the shooting distance range that compensates for the appropriate exposure by firing the flash. This is data to match the shooting angle of view.

When the camera body (BD) starts exposure control operation,
The signal line (C3F) is set to "Lou+" and a pulse during the third time is output to the signal line (FMO). Then, this pulse is read from the signal line (S T , ) by the 7 lash device (FL), and the flash device (FL)
) is the light emission mode for exposure control. Then, when the actual exposure control operation starts, “LO” is applied to the signal line (RL).
II+'' pulse is output and the interface circuit (
IF) is a flash light amount control circuit (FLM).
Data from the signal line (S T 2) is transferred to the signal line (
FST) and from the circuit (FLM) to the line (F
The signal input via the signal line (Sr1
). The signal line (Sr1) outputs a "Lova" signal until the flash device (FL) starts emitting light, and changes to "High" when the flash device (FL) starts emitting light. The light emission amount control circuit (FLM) is equipped with a light receiving element that receives the subject light that has passed through the photographic optical system and reflected from the film surface, and has a signal line (
Sr1), (F S T ) changes from “High” to “L”
ow”, the output current of this light-receiving element starts to be integrated.Then, the integrated value is changed to A-D, D-A converter circuit (
Film sensitivity (Sv) input from ADA)
) and the exposure compensation amount (Cv) When the data reaches the value corresponding to the analog signal of Sv + Cv, the signal line (FSP)
Outputs a “High” pulse. This pulse is input to the flash device (FL) via the signal line (Sr1) and flash emission is stopped.

Furthermore, when a pulse is input from the signal line (Sr1) for data exchange, the flash device (FL) can perform a boosting operation for a certain period of time (for example, 15 minutes) from the time the pulse is input.

Therefore, every time data is exchanged with the camera body (BD), external pressure operation is performed for a certain period of time from that point onwards.

When using this function for interval shooting with flash photography, a signal to start the camera body (BD) is input from the back circuit (BCKC) a certain period of time (for example, 1 minute) before the start of shooting. When the camera body (BD) is activated, data is exchanged with the flash device (FL) and a boost operation is performed. Therefore,
Even in interval photography using flash photography having intervals of 15 minutes or more, the main capacitor of the flash device (FL) is fully charged before photography.

Above meters (MET), receivers (RFC)
, flash device (FL), interface circuit (I
F) A specific example of the flash light emission amount control circuit (FLM) is described in, for example, Japanese Patent Application No. 59-201381, and will therefore be omitted here. It also includes a flash device (FL), an interface circuit (IF), a flash light amount control circuit (F
In addition to the above-mentioned examples, specific examples of
This is also shown in Japanese Patent Application No. 59-48435.

Next, the inside of the camera body (BD) surrounded by broken lines will be explained. (BMC) is a microcomputer whose operation is shown in the flowcharts of FIGS. 2 and 3.

(BA) is a power supply battery, and the photometry circuit (FLM) is connected directly from this battery (BA) via a power supply line (10E).

(AM), and the circuits other than the AD/DA conversion circuit (ADA) are supplied with power. The transistor (BT) is controlled “ON” and “OFF” by the signal from the output port (OPo) of the microcomputer (BMC).
When “ON”, the photometry circuit (FLM), (AMM), A-D/D-A conversion circuit (A
DA) and the lens circuit (LEC). (
DSP) is a display circuit that controls photometry mode, exposure control mode, exposure time for control, aperture value for control, film sensitivity,
Displays the exposure compensation amount and flash device status. Also,
When the exposure time and frit value are out of control interlock, the exposure time and aperture value at the control limit blink and a warning is displayed. This display circuit (DSP) is connected to a signal line (CSD
) is “Lou+”, the microcontroller (BM
Serial data sent from the data output terminal (SOU) of C) in synchronization with the clock pulse from the terminal (SCK) is read, and a display is performed based on this data.

(AMM) is a photometry circuit for ambient light, and has a light receiving element for partial photometry and average photometry.
) can be switched by “High” or “Low”. This photometry circuit (AMM) outputs a voltage signal obtained by logarithmically compressing the output current of the light receiving element.

When the “Lou+” pulse is output to the signal line (ADSTA), the A-D, D-A conversion circuit (A D A ) converts the output of the photometry circuit (AMM) to the microcontroller (BMC) terminal (CK OUT A-to-D conversion is performed based on the clock pulse from ). Also, the signal line (C3A) is “L”
OW” and (A D M O) is “I-Iigh”, A is synchronized with the clock pulse from the terminal (SCK).
- Send the D-converted data to the data input terminal (SIN) of the microcontroller (BMC), and the signal line (CS A)
When (ADMO) is “Low”, the above-mentioned data Sv + Cv is read from the output terminal <5OU), and this data is converted from D to A and sent to the light emission control circuit (FLM). Output.Please note that the signal line (CS
When A) is “Higl+”, the microcomputer (BMC)
No data is exchanged with. (G1) is a date circuit, which becomes active when the signal line (C3L) becomes “Lou+” and connects the lens circuit (LEC) to the microcontroller (BMC).
) data transfer is possible.

(AFC) is an automatic focus adjustment circuit, and the signal line (
When AFEN) becomes “Lou+”, it becomes operational,
・Operation stops when it becomes “Higb”. Further, when the signal line (cs AF) is "Lou+", automatic focus adjustment data from the microcomputer (BMC) is read.

A specific example of this automatic focus and α adjustment circuit (AFC) is shown in, for example, Japanese Patent Application Laid-Open No. 140408/1983, so the details will be omitted.

(APG) is means for outputting pulses in response to the movement of the aperture member, and these pulses are sent to the microcomputer (BM).
C) is input to the terminal (CKIN).

The pulse input to this terminal (CKIN) is
Based on this pulse, the data is input to the event counter in the MC and is subtracted from the preset data of the number of refinement stages. Then, when the content of the filter becomes "0", it means that the number of steps has been narrowed down by the planned number of stages, and when the counter interrupt is generated, a pulse to stop the narrowing down is output from the output capo (OP, 2) and the narrowing down operation is stopped. .

(MGD) is a magnet circuit, and the signal line (R
When a "Low" pulse is output to L), the release magnet operates, and the stop-down operation and mirror-up operation begin. When a "Lou+" pulse is output to the signal line (AP), the aperture magnet operates and the aperture operation stops. When a pulse of "Loa+" is output to the signal line (IC), the leading curtain lock release magnet operates and the leading curtain starts running.When a pulse of "Lou+" is output to the signal line (2C), the leading curtain locking magnet operates and the leading curtain starts running. The lock release magnet operates and the trailing curtain starts running.

(G2) is a gate circuit, and the signal line (C3B) is “L”
ou+”, it becomes active and the buck circuit (BCK
Data can be exchanged between C) and the microcomputer (BMC). The signal line (CS B) is the back circuit (BCKC)
When the camera body (BD) becomes operational and attempts to exchange data with the back circuit (BCKC), the back circuit (BCKC) also becomes active.

Furthermore, the signal line (C8B) is connected to the back circuit (BCK
In order to prevent film winding during data imprinting in step C), when the trailing curtain starts running, a "Lou+" pulse is output. When the back circuit (BCKC) receives this pulse, it stops the imprinting operation at a time corresponding to the film sensitivity data sent from the camera body (BD). When the signal line (BIO) is "Higb", data is sent from the camera body (BD) to the back circuit (BCKC), and when it is "Lou+", data is sent from the back circuit (BCKC) to the camera body (BD).

A pulse for data imprinting is output to the signal line (IP). This pulse is output from the time when the exposure control operation starts, and has a time width corresponding to the film sensitivity.

The switch (Sl) is a photometry switch that is closed when the release button is depressed in the first step, and starts photometry calculation operation. In addition, a signal line (BSI) is input from the back circuit (BCKC) in parallel with this switch (Sl), so that the microcomputer (BMC) can also be started from the back circuit (BCKC). Buck circuit (BCKC)
The activation signal is input from the 3D through the signal line (BSI) when the back circuit (BCKC) is operated and the back circuit (BCKC) is operated, and when the shooting operation is performed during interval shooting as described above. There are two types: a case where the camera body is started to start boosting the pressure of the 7 lash device (FL) one minute before the start;

The switch (G2) is a release switch that is closed by the second step of pressing down the release button.
) is closed, the exposure control operation is activated. In addition, a signal line (BS2) from the back circuit (BCKC) is connected in parallel with this switch (G2), and the signal line (BS2) is connected in parallel from the back circuit (BC, KC) to the back circuit (BC, KC) for interval shooting and a constant exposure value for proper exposure. Shooting a predetermined number of photos at different times (
When performing bracket photography (hereinafter referred to as bracket photography), a signal is transmitted to the camera body (BD) to start the photography operation. Furthermore, when shooting a predetermined number of frames (hereinafter referred to as frame number) during bracket shooting, the release switch (G2) on the camera body (BD) is turned “ON”.
The back circuit (BCK) prevents the transition to exposure control operation even if
It is prohibited from the camera body (B).
When the release switch (D) (G2) is turned "OFF", it is possible to move on to the next bracket photography. Therefore,
The back circuit (BCKC) checks the status of the release switch (G2) on the camera body (BD), and if the release switch (G2) is turned "ON" after shooting the set number of frames by bracket shooting, Data that prohibits transition to exposure control operation is stored in the back circuit (BC).
(KC) to the camera body (BD).

In addition, during interval shooting, the back circuit (BCK
In C), it is possible to set the shooting start time, the number of frames, and at what time interval and how many times (hereinafter referred to as the number of groups) to carry out shooting for this number of frames. Then, at the start time, the back circuit (BCKC) sends "L" to the signal line (B S2) until the number of frames have been photographed.
ow" signal to perform exposure control operation. When the shooting of one group is completed, the signal line (BS2) is set to "High", the time is counted for the set time interval, and the remaining The time is displayed.When the remaining time reaches 0 seconds, the signal line (B S
2) is set as "Lou1" and images are taken for the number of frames. When the above operations are completed, the set interval shooting mode is canceled. In addition, the back circuit (BCK
Even if C) is operating in the interval shooting mode, if the release switch (S, ) of the camera body (BD) is closed, the set start time and time interval will be ignored and the shooting operation will not be performed. It will be done. In other words, even if the start time has not yet been reached, when the release switch (S2) is turned "ON" and the photographing operation starts, the back circuit (BCKC) is connected to the signal line (BS) until the number of frames have been photographed.
2) is set to "Lou+". Further, the same operation is performed when the release switch (S2) is closed before the set time interval has elapsed. In addition, the camera body (BD
) is the number of shooting operations performed on the signal line (IP).
This is determined by counting the number of input pulses for data imprinting.

A switch (SMO) on the camera body (BD) is a switch for switching the exposure control mode.

The mode changes each time this switch (SMO) is turned from "OFF" to "ON". The camera's exposure control modes are program automatic exposure control mode (P mode), exposure time priority automatic exposure control mode (S mode), aperture priority exposure time automatic exposure control mode (A mode), and manual exposure control mode (M mode). ). Each mode is P-A-M
-, S→P... changes in this order.

The switch (SIS) is a switch for setting film sensitivity, and each time this switch (srs) changes from "OFF" to "ON", 1. The film sensitivity changes in steps of /3Ev, and when the switch (SIS) changes from "OFF" to "ON" after reaching the upper limit value, it changes to the lower limit value, and the switch changes from "OFF" to "ON" again. Then it increases again.

(SOR) is a switch that sets the exposure compensation amount, and each time this switch (SOR) changes from "OFF" to "ON", it changes from 0 → 1/2 → 1 → 11/2 → 2 → 21/2 → 3 →３
1/2→4→-4→-31/2→-3→-21/2→-
It changes in the order of 2→-11/2→-1→-1/2→O.

(ST) is a switch for setting the exposure time, and each time this switch (ST) changes from "OFF" to "ON", the exposure time changes to the shorter side in IEv steps. And when in S mode, 32sec → 165ec-+
85ec---→1/1000sec →1/200
0sec→1/4000sec→32sec→・・・
..., and when in M mode, 32se
c-> 16sec-+ ---) 1/2000sec
C→1/4000sec→Valve→32sec→・・・
It changes like this. Therefore, the valve mode can be set by operating the switch (ST) in the M mode. The switch (SA) is a switch that sets the aperture value, and this switch (SA) changes from "OFF" to "
When the mode changes to "ON", the mode is A, M mode and %1.
The aperture value changes from the open aperture value to the maximum aperture value in steps of /2Ev. When the maximum aperture value is reached, the aperture value changes to the maximum aperture value. The above switches (S MO), (S
I S ), (S OR), (S T), and (S A) are switches that are closed by operating operation keys provided outside the camera, respectively. Also, switch (S,)
, (S 2), (S MO), (S I S ), (S
OR), (S T ), and (SA) are AND circuits (
via the microcontroller (BMC) interrupt terminal (IN
Therefore, when the data setting key provided on the outside of the camera is operated or the release button is operated, the signal lines CBS, ), (B S2) via “
When the Lou+" signal is input, if the microcomputer (BMC) is in a stopped state, the microcomputer (BMC) accepts this interrupt signal and starts operating. The switch (SCN) is linked to the mechanical film counter. It's a switch.

This switch (SCN) remains "ON" until the film counter reaches the position where the number of shooting frames indicates "1".
The signal from this switch (SCN) is sent to the back circuit (IP, ) of the microcomputer (BMC) through the terminal (T9) and the terminal (T9).
BCKC). The microcomputer (BMC) performs exposure control using the shortest exposure time and maximum aperture value while the switch (SCN) is "ON". On the other hand, the back circuit (B CK
C) When the switch (SCN) is turned ON, the data imprinting operation is not performed even if a pulse signal is input from the signal line (IP).Furthermore, the back circuit (BCKC) is input every time a photograph is taken. There is a function that adds or subtracts "1" from the set value for each pulse from the signal line (IP) and imprints this data, but the switch (SCN)
Addition and subtraction operations are not performed while is "ON". Note that while the switch (SCN) is ON, the signal line (IP
), the back circuit (
BCKC) does not require checking the state of the switch (SCN) to determine whether or not to imprint data or whether to perform addition/subtraction, and also eliminates the need for terminals (T, ). In addition, an electric film counter is used instead of a mechanical film counter, and until the film reaches the proper shooting frame position (the counter display is "1"), the "L"
"our" signal may be output to the terminal (T9), or furthermore, the pulse may not be output to the signal line (IP).

The switch (S A S ) is linked to the metering mode switching member attached to the exterior of the camera and can be turned on or off.
F" switch, and this signal is sent to the microcomputer (BM
C) is input to the input port (IPll), and the microcontroller (BMC) inputs the “LOLI+” signal from the output port (OP, ) to the signal line (ASMO).
Lou +" signal is output to set the partial metering mode, and the display unit (DSP) displays the partial metering mode. On the other hand, the "High" signal is input to the input capo (IP). If so, the signal line (ASMO) will be “H”.
II? h" signal is output to set the average metering mode, and data indicating the average metering mode is sent to the display section (DSP). The switch (S,) is turned on when the exposure control mechanism finishes the exposure control operation. This is a switch that turns OFF when the shutter charging operation of the exposure control mechanism is completed.The signal from this switch (S4) is input to the input port (IPs) of the microcomputer (BMC).
In C), if a "Low" signal is input from this switch (S,), even if the release switch (S2) is "ON", the exposure control operation will not proceed.

The microcomputer (BMC) outputs pulses at a time corresponding to the film sensitivity to the signal line (IP), but the back circuit (BCKC) shown in Figure 1 is connected to the camera body (BD). A time corresponding to the read film sensitivity is created in the back circuit (BCKC), and data is imprinted only during this time. Therefore, the pulse from the signal line (IP) is used only as a signal to start the imprinting operation. However, it does not have the function to read film sensitivity data from the camera body and create a time corresponding to this data, and the signal line (
A camera back equipped with a data imprinting section that imprints data while pulses are input from the IP) is sometimes attached to the camera body (BD), so the microcomputer (BM
C) has such a function. The back circuit (BCKC) has a function to record the exposure time and aperture value for exposure control sent from the camera body. For this reason, the microcomputer (BMC) always sends the exposure time and aperture value to the back circuit (BCKC) before entering the exposure control flow and outputting pulses to the signal line (IP). Therefore, the back circuit (BCKC) is designed to control the exposure control from the camera body (BD) in order to reduce the probability that the trailing curtain starts running and stops before data imprinting reaches an appropriate time. When it detects the movement of changing the time and aperture value, it starts the imprinting operation.

The operation of the camera system shown in FIG. 1 will be described below based on charts 70 in FIGS. 2 and 3. Switch (SI)
= (S 2) (S M○), (S I S ), (S
OR).

(S T ), (S A ) turns ON'', or the signal line (BS
,).

When the “Lou+” signal is input from (BS2),
The output of the AND circuit (AN) becomes "Low" and the interrupt terminal (INT) of the microcomputer (BMC) falls to "Low". Then, the microcomputer (B
MC) starts the operation from step #0.

First, in step #0, Lo is applied to the signal line (C3B).
w'' pulse is output to activate the buck circuit (BCKC), and in step #1, the transistor (BT) is turned on and the photometry circuit (FLM), (AMM), A-
D, D-A conversion circuit (ADA), lens circuit (LEC)
Start supplying power to. Then, in step #2, it is determined whether the "LoIll" signal is input to the input port (IPI), that is, whether the switch (S2) is turned "ON".
It is determined whether a release signal is input from the signal line CBS2) of the back circuit (BCKC). If the "Lou+" signal is input to the input port (IP), the process moves to step #3. In step #3, it is determined whether the switch (S,) is turned "OFF" and charging of the exposure control mechanism is completed, and the switch (S,) is turned "OFF".
If the switch (S,
) is "OFF", then in step #4 it is determined whether the 7-lag RL E F is "1". This 7-lag RLEF is set to "1" if the data for exposure control (Tv, Av) is ready and the release prohibition signal is not input from the back circuit (BCKC), indicating that the data preparation is not completed. Or, if a release prohibition signal (input at the end of bracket shooting) is input from the back circuit (BCKC), it is reset to "O". If the 7 lag RLEF is "1" in step #4, the flow moves to the exposure control operation starting from step #110, and
If the lag RLEF is "0", the process moves to step #10. Also, in step #2, enter “L”
If the signal ou+'' is not input, the process moves to #10 Stellar P.

In step #10, “Lo
Determine whether the u+'' signal is input, and if it is input, set the 7 lags S and F to “1”; if not, leave S and F at “0” and #12 The process moves on to the step .This may be due to the switch (Sl) inputting "Lou+" to the input capacitor (IP,), or whether it is due to the back circuit (
This is a preparatory operation for determining whether the data is based on BCKC). Next, in step #12, the switch (SA S
), one of the partial and average light receiving elements in the photometry circuit (AMM) is selected, and the process moves to step #13. In step #13, the signal line (C3L)
is read out from the lens circuit (LEC) by reading out various data from the lens circuit (LEC) by reading the serial input/output operation multiple times, and then in step #14, the clock output terminal (
Start outputting the A-D conversion clock from CKOUT), output the "LoIu" pulse to the signal line (ADSTA), and convert the output of the photometry circuit (AMM) to A-D.

The DA conversion circuit (ADA) starts the operation of A/D conversion.

Next, in step #20, it is determined whether the 7 lags S and F were set to "1" in step #11,
If it is set, the process moves to step #21; if it is not set, the process moves to step #24. If the 7 lags S and F are not set, it means that the operation is not caused by the switch (Sl) or the signal line (BSI) of the back circuit (BCKC). To prevent unintentional movement, set the signal line (A F E N ) to “Hi”.
gh” and set 7 lags S and F to “0” in step #25.
(in this case, it has already been reset to "0") and moves to step #26. On the other hand, #20
If 7 lags S and F are “1” in step #2, then
In step 1, the input capo (IPo) is still “Lou”.
Determine whether it remains +''.This is the back circuit (B
CKC) to start the boost operation of the 7 lash device one minute before interval shooting, or the back circuit (B
CKC) starts the operation for exposure calculation, the signal line (BSI) is used to start the camera body (BD).
) outputs a "Low" pulse.

By the way, when the camera body (BD) is activated by the back circuit (BCKC), it is undesirable that the automatic focus adjustment operation is performed and the lens moves inadvertently.

Therefore, the back circuit (BCKC) is connected to the camera body (BD).
When starting up the microcontroller (BMC), a “Low” signal with a width shorter than the time from the time when the interrupt signal is input to the microcontroller (BMC) to step #21 and longer than the time from the time to step #10 is required.
” pulse is output to the signal line (BSl), and #
In step 21, input capo) (IP.) is “Lou+”
The signal line (
BS, ) is “High”. Therefore, in this case, the signal line (AFEN) is set to "High" in step #24 to disable the automatic focus adjustment operation, and the process proceeds to step #26 via step #25.

On the other hand, in step #21, the input capo (IPo) is “L”.
If it is determined that the signal line is “Lou+”, this means that the photometry switch (S,) is “ON”, and in this case, the signal line (A F E N ) is set to “Lou+”.
to operate the automatic focus adjustment circuit (AFC), set the signal line (C8AF) to "LoIll" to send automatic focus adjustment data, and set the signal line (C8AF) to "High".
After returning to "h", the flags S and F are reset to "0" in step #25, and the process moves to step #26.

In step #26, data is read from the flash device (FL) and receiver (RFC).

As mentioned above, this operation causes the signal line (C3F) to be “L”.
ow" and outputs a pulse during the first time to the signal line (FMO). Then, serial input/output operation is performed. First, the first byte data is sent from the flash device (FL), then the receiver ( RFC) to the meter (ME
Data is output in the order of the 2nd, 3rd and 4th bytes of the aforementioned data read from T), and this data is read. Then, the signal line (C3F) is set to “H”.
"high" and the operation of step #26 is completed.

Next, in step #30, it is determined whether the film sensitivity setting switch (SrS) has changed from "OFF" to "ON", and if it is determined that it has changed, the film sensitivity data is increased by 173 Ev and # Move to step 32. On the other hand, if it is not determined that there has been a change, the process immediately moves to step #32, and it is determined whether the exposure correction amount setting switch (ORS) has changed from "OFF" to "ON". Then, when a change is detected, the exposure compensation amount is increased by 172 Ev in step #33, and step #34
If no change is detected, the process directly advances to step #34.

In step #34, it is determined whether the switch (SCN) is "ON", and if it is "OFF", the process moves to step #40. On the other hand, if the switch (SCN) is "ON", the film counter is If the normal number of frames ("1") is not displayed (S...), then proceed to step #35. In step #35, the minimum exposure time (Tvmax) and The maximum aperture value (Avmax) corresponding to the minimum aperture is set for control, and #10
After setting the 7-lag RLEF to "1" in step #8, the process moves to step #75. Back circuit (BCKC) or meter (MET) until the regular number of shooting frames is reached.
Even if the control data from the receiver (RFC) is read from the receiver (RFC), the camera body ignores this data and
Xt A vlIlaxi? Exposure control will be performed.

In this case, exposure calculation is not performed on the camera body (BD), and furthermore, settings other than film sensitivity and exposure correction amount data are not accepted. In addition, the variation circuit (BCK
Even if data prohibiting the exposure control operation is input from C), it will be ignored.

In step #40, it is determined whether the flag BCKF is 1''.This 7-lag BCKF is connected to the buck circuit (BCKC
) calculates exposure control data, sends this data to the camera body (BD), and causes the camera body (BD) to perform exposure control based on this data (hereinafter referred to as back ICP). When “1” is read
", and otherwise it is reset to "O". Therefore, since it is always reset to "O" during the first operation, the process moves to step #41.

On the other hand, when exposure control is performed based on data from the back (BCKF=1), the data change step operations #43 to #48 are not performed and the process immediately proceeds to step #51. Therefore, the switch (S M O), (S
Even if T ) and (S A ) are manipulated, no data is changed.

In step #41, the mode switch (SMO) is set to “O”.
It is determined whether the switch (SMO) has been changed from "FF" to "ON", and if the change is determined, the exposure control mode is changed.On the other hand, if the switch (SMO) is "OFF" or remains "ON", the exposure control mode is changed. Leave the mode unchanged and proceed to step #43. In step #43, it is determined whether the mode is S or M, and since the S or M mode accepts a change in exposure time, the process moves to step #44. On the other hand, S.

If the mode is not M mode, the process immediately moves to step #46. In step #44, the switch (ST) is turned OFF.
” to “ON”, and if a change is detected, the exposure time is increased by IEv. On the other hand, if no change in the switch (ST) is detected, #
Proceed to step 46.

In addition, as mentioned above, the shortest exposure time (1/4000se
After c), the switch (ST) changes from “OFF” to “O”.
When the mode changes to N'', the maximum exposure time (3
2 seconds), and if in M mode, changes to a valve. In step #46, it is determined whether the mode is A or M. If the mode is not A or M, the setting of the aperture value cannot be accepted, so the process proceeds directly to step #50, and if it is in A or M mode, step #47 is selected. A change in the switch (SA) is determined. If there is no change, the process moves directly to step #50, and when a change from '○FF' to "ON" is determined, the aperture value is increased by 1/2 Ev and the next step #5 is determined.
Move to step 0. In addition, #30. #32. #4
1°#44. #47 switch OFF” to “ON”
To detect a change in the status, at each step, the state of the switch at that time is memorized, and when the next step is reached, the state of the mackerel's switch is compared with the signal that remembers the previous state. Take it by detection.

In step #50, the signal line (C3A) is set to “Lo”.
u+”, then perform serial input/output operation, read the A-D converted data in series, and connect the signal line (C3A
) is set to “High” and the clock output terminal (CK OU
The output of the clock from T) is stopped and the process moves to step #51. Then, in step #51, it is determined whether the 7-lag BCKF is "1" and if it is "1", #5
The process moves to step #55 without passing through the calculation steps of 2.53.54. On the other hand, if the 7 lag BCKF is "0", the process moves to step #52 and the 7 lag device (FL
) to determine whether a charge completion signal is input. If the charge completion signal has been input, exposure calculation for 7-lash photography is performed in step #53, and if the charge completion signal has not been input, exposure calculation for ambient light photography is performed. When the above calculation operations are completed, the microcomputer (BNC)
) moves to step #55. In addition, #53
, 54 are disclosed in Japanese Patent Application Laid-Open No. 59-11113.
No. 2, JP-A No. 59-140408, etc., so the description thereof will be omitted.

In step #55, the signal line (C3B) is set to “Lo”.
u+'', the signal line (BIO) remains “High”, and the data is transferred to the back circuit (BCKC).The following data is sent from the camera body (BD).First, 1 byte The first byte is the data sent from the flash device, and the second, third, and fourth bytes are the meter (ME) read from the receiver (REC).
The data is from T. In addition, the back circuit (
When BCKC) determines that exposure control data from the meter (MET) has been input, it performs a display based on this data and sends this data back to the camera body (BD) as control data. This function is called an external 7 function. This external function is a meter (
When exposure control data from MET) is input,
If the function in which the back circuit (BCKC) performs exposure calculations (hereinafter referred to as the exposure function) is active, what exposure modes (three types of P modes, S, A, M modes, and manual Even if the long time (M/LT) mode is selected, it becomes an external function and performs exposure control based on data from the meter (MET). Furthermore, when the exposure function is active, a function that stores a plurality of photometric values from the camera can be activated (hereinafter referred to as a multifunction). This 7
7 functions include multiple memorized photometric values (■ - ), intermediate values between the maximum and minimum memorized photometric values ((
B vmax + B vmin)/2) (hereinafter referred to as center mode), a value that reproduces the maximum value at the upper limit of film latitude (B vmax 2, 3)
(highlight mode) and a mode (shadow mode) to find a value (Bvmin+2.7) that reproduces the minimum value to the lower limit of 2 degrees. Even if such a multifunction is active, the meter (M
If exposure control data is input from E T ), it becomes an external function and the multifunction becomes invalid. Furthermore, when the exposure function is in the active state, a function for performing bracket photography (bracketing function) may also be in the active state. In addition, when it is determined that exposure control data from the meter (MET) has been input, bracket photography is performed based on the exposure control data from the meter (MET).

The 5th byte of data sent from the camera body (BD) to the back circuit (BCKC) is the A-D-D-A conversion circuit (A
Photometric data (Bv Avo) read from (DA) (
Avo: open aperture value), the 6th byte is the lens circuit (LE
The open aperture value data (Avo) read from C), and the seventh byte is the maximum aperture value data (Av+++ax).

Furthermore, the 8th byte is the minimum exposure time de (T vmax),
The 9th byte is the longest exposure time data (Tv+n1n), 1
The 0th byte is the synchronization limit exposure time data (Tvx) for flash photography, the 11th byte is the exposure time data (Tv) determined by the camera body (BD), and the 12th byte is the aperture value data (A) determined by the camera body. v). Furthermore, 1
The 3rd byte is the film sensitivity (Sv), and the 14th byte is the exposure compensation amount (Cv). When the above data transfer is completed, the microcomputer (BM) of the camera body (BD)
C) moves to step #56 and connects the signal line (BI
O) to “Lou+”. Then the back circuit (BCK
1 byte of data is sent from C). This data is the aforementioned back ICP. For example, when the exposure function is selected, the back circuit (BCKC) is “80H”.
” (H indicates a hexadecimal number), and if the exposure function is not selected, the back circuit (BCKC) is sent.
does not output this data, and the camera body (BD) reads "OOH". When the reading of this back ICP data is completed, the microcontroller (BMC) outputs the signal line (C5
B), (B I O) is set as "Higb" and the process moves to step #57.

In step #57, it is determined whether the back ICP is "80H", and if it is not "80H", the back circuit (BCK
This is the case when a back cover without C) is attached or the exposure function is not selected in the back circuit (BCKC). In order to perform calculations based on the data, in step #58, 7 lag BC
KF is reset to "0" and the process moves to step #90.

If it is determined in step #57 that the back ICP is 80H, it means that the exposure function has been selected, and the process moves to step #60 to set 7-lag BCKF to "1". And the back circuit (BC
Based on the data sent to the back circuit (BCKC)
) to calculate the exposure control data #61
Wait at the step.

During this time, the back circuit first calculates a photometric value based on the sent data. During this time, the signal line (C8
B) remains "Low". This means that (B y −A
vo) + A yo: B y is only calculated, but if multi-function is selected, the function will be calculated according to the mode selected from among the above-mentioned average mode, center mode, highlight mode, and shadow mode. Perform calculations. Note that when using multi-function, unless a memory operation (pressing the memory key) is performed, exposure calculations will be performed based on the metering data from the camera body (BD) each time the data is updated. After the memorization operation is performed, control data is calculated based on the memorized photometric data, and the camera body (
BD) will only be displayed.

Then, control data is calculated by performing exposure calculation according to the photometric data thus obtained and the set exposure mode. This calculation is performed using the first program (P,) with a slope of 2/3, which divides Bv+5v=Ev into aperture value and exposure time at a ratio of 2:1.
mode (in principle, Av=2/3 ・Ev, Tv=1
/3 ・Ev), the second program with a slope of 1/2 (P2
) mode (Av=1/2 ・Ev, Tv=1/2
・Ev), third program (P3) mode with slope 2/3 (Av= 1/3 ・Ev.

There are three types: Tv=2/3・Ev). Also,
The S mode calculates Ece Tv=Av from the Tv set in the back circuit (BCKC), and the A mode calculates the set A
Ev-Av=T+, 4 is calculated from v, and further, in M mode, the set AV and Tv are calculated as control values.

In addition, if the calculated Av becomes Av>Avmax, EV−Avmax=Tv, Av<
If it is A VQ, calculate EV-Av, = Tv, and calculate this Tv and A vmax.

Alternatively, Tv and Avo are calculated values. Similarly, Tv<T
Outside of vmin, Tv+nin and EV-Tv+n1n
= Av when T v > T v + nax, Tvma
Let x and EV Tvn+ax=Av be the calculated values. Also, P IIP2. When in P mode, AVO<AV
Manually set A v where llAV2<Av mark ax
1 Limit print with HA v2.

Furthermore, in the M/LT mode, it is possible to set an exposure time longer than the maximum exposure time (Tvmin) that can be set on the camera body. When such a time is set, data for the bulb is sent to the camera body (BD), the camera body is set to bulb mode, and this time is set to the back circuit (BD).
BCKC).

During this time, the signal line (BS2) is connected to “Lou+
”, so that the rear curtain does not run, and when the count ends, (BS2) is set to “Higl+” and the rear curtain runs.The display data on the camera body is the bulb display. Data for setting time display is sent instead of data for display.If multi-function is not selected, the exposure control diagram and Ev for each mode are sent.
A value line is displayed graphically on the back side, with the vertical axis representing the aperture value and the horizontal axis representing the exposure time. Furthermore, when the multi-function is selected, each stored value and current value based on the exposure control value is displayed graphically.

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

Additionally, if it is determined that there is a charging completion signal in the data from the flash device input via the camera body, the back circuit does not perform the above-mentioned calculation display, and the camera body (BD ) is displayed, and the data is used as control data. This means that the calculation for 7-lash shooting on the camera body side (step #53) is
For example, JP-A-59-140408, JP-A-59-11
As shown in No. 11-32, etc., it uses a circuit with considerable functionality, so the back circuit (BCKC
) does not need to perform any calculations for flash photography.

For example, in order to support a camera body that does not have the above-mentioned flash photography function, the same calculation as in step #53 is performed on the back circuit side so that line = 48- is completed, and charging is completed. When the signal is input, if an exposure function has been selected, the flash function may be automatically selected, calculations may be performed according to the exposure mode set at that time, and control data may be sent to the camera body. Furthermore, a multi-function, a calculation combining a bracket function and a flash function may be prepared, and the results of this calculation may be sent to the camera body (BD).

When enough time has elapsed for the above operations to complete, the microcontroller (BMC) moves to $E6?7) and reads data from the back circuit (BCKC). In this data, the first byte is exposure time data for control (bulb in M/LT mode), the second byte is aperture value data for control and display, and the third byte is exposure time data for display (in M/LT mode). (set exposure time), the fourth byte is the back exposure mode (P,, P2
．． P, is P mode, M, M/LT mode is M mode, external 7 action is meter photometry mode), 1.2 bytes of control data is data limited to the limit value because Ev is out of control interlock. There is non-linked data indicating that the exposure control operation is prohibited, data (release prohibition data) indicating whether the exposure control operation is prohibited, etc. After reading these 4 bytes of data, the microcontroller sets the signal lines (C3B) and (BI○) to “Hi”.
gh'', and in step #63, the read Tv,
Set Av as control data. Then, it is determined whether the release prohibition data has been read, and if it has been read, the 7-lag RLEF is set to "1", and if it has not been read, the flag RLEF is reset to "0".
Proceed to step 70.

In step #70, the exposure mode is displayed according to the read mode data (M mode when in meter metering mode), and in step #71, it is determined whether or not non-linked data is being read, and the data is read. If so, a warning is displayed, and if it is not read, the warning is not displayed and the process moves to step #74. #7
In step 4, select meter metering mode or camera body (B
D) indicates whether the mode is average metering mode or partial metering mode.

In step #75, the control exposure time and aperture value are displayed. Note that when long exposure time data is sent from the back circuit (BCKC), bulb data is sent for control purposes, but this long time data is sent for display purposes. This data will be displayed.

Next, in step #76, the film sensitivity and the exposure correction amount are displayed, and then, based on the data sent from the flash device (FL), whether or not flash photography will be used is displayed. Next, in step #78, the signal line (C
8F) as "Lou+" and outputs a pulse during the second time to the signal line (FMO).

When the 7 lash device ff1 (FL) reads this pulse, it becomes ready to read data from the camera body.

The microcomputer (BMC) firstly uses the first byte to control aperture value and exposure control mode, the second byte to add the film sensitivity and exposure compensation amount (Sv + Cv), and the third byte to the focal length of the interchangeable lens. Data (fv). The method of using these data is as described above.

When the above operations are completed, the switches (S l), (S 2), (S MO), (S I
S).

It is determined whether at least one of (S OR), (S T ), and (S A ) is closed. and 1
If it is always closed, the timer is reset and started in step #80, and the process returns to step #2 to repeat the operations described above. On the other hand, if all of the above switches are "OFF", the count time of the timer started in step #80 (10 seconds) is set in step #81.
) has finished, and if it has not finished, return to step #2 again. On the other hand, when 10 seconds have elapsed since all the above switches were turned OFF, #
Proceed to step 85. Then, in step #85, an interrupt is enabled to the interrupt terminal (INT), and a 7-lag RL
Reset EF and BCKF to “O” and change the display to “OF”
F” and turn off the power supply transistor (BT).
As a result, the microcomputer (BMC) stops operating.

When it is determined in the step #57 that the back ICP is not "80H", the 7 lag BCK is determined in the step #58.
Reset F to 0" and move to step #90 in Figure 3. In step #90, the meter (MET
The receiver (RFC) reads the exposure control data from > and determines whether the camera body (BD) has read this data. When it has been read, the process moves to step #91, and when it has not read, the process moves to step #100. In step #91, the aperture value of the data read from the meter (MET) is limited to the range of the open aperture value and the maximum aperture value, and the exposure time is limited to the range of the open aperture value and the maximum aperture value.
For ambient light photography, limit the exposure time to the minimum and maximum exposure times, and for flash photography, limit the exposure time to the sync limit and maximum exposure time. Then, the meter (M
The data from E T ) is set as a control value, the exposure control mode is set to M mode, and the photometry mode is set to meter photometry mode, and the process moves to step #105. On the other hand, if the data from the meter (MET) is not read in step #90, step #5
The data calculated in step 3 or #54 is set as control data. Note that setting the control aperture value in #63°92.100 corresponds to setting the number of aperture stages (Av Avo).

Step #101 displays the exposure control mode of the camera body (BD), further displays the metering mode, and then steps #105.
Move to the next step. When the control data is limited to the interlocking limit data, the warning display is set to "ON", and when it is not limited, the warning display is set to "OFF".
The flag RLEF is set to "1" and the process moves to step 75 in FIG.

In step #2, input capo) (IP, ) is “Lou+”
If the switch (S4) is "OFF" and the 7-lag RLEF is "1", the exposure control operation starts from step #110 in FIG. 3. First, in step 110, the signal line (A F E N ) is tied to "Higl+" to stop the operation of the automatic focus adjustment circuit (AFC), and then the release signal is transmitted to the 7 lash device (FL).

This operation sets the signal line (C3F) to "Lou+", outputs a pulse with a third time width to the signal line (FMO),
This is done by setting the signal line (C3F) to 'High' again. When the flash device (FL) determines that the pulse during this third time has been input, it enters the light emission mode for photographing. Next, the signal line (C3F) is set to 'High'. Line (C3B)
+”, 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 a data imprinting operation when the imprinting 7 movement is selected. The imprinting functions include imprinting mode 1, control data mode, year/month/day mode, month/day/year mode, day/month/year mode, month/date/hour mode, and date/time.・There are minute mode, hour/minute/second mode, count up mode, count down mode, and fixed data mode.

In the control data mode, the control data calculated by the back circuit (BCKC) (only when exposure function control is selected) or the control data sent from the camera body (BD) in step #112 is imprinted. Year/Month/Day mode, Month/Day/Year mode, Day/Month/Year mode, Day/Month/Hour mode, Day/Hour/Minute mode 1, Hour/Minute/Second mode are each operated by the buck circuit (BCKC). Print each data from the calendar circuit in order of mode name. Count-up mode and count-down mode imprint a value obtained by adding or subtracting 1" from a preset fixed value each time a photograph is taken. Fixed data mode imprints a preset value.

The microcomputer (BMC) then closes the signal lines (C3A) and (ADMQ) with “Lou+” in step #113.
Added data of film sensitivity and exposure compensation amount (Sv+Cv)
is sent to the AD-DA conversion circuit (ADA). circuit(
ADA) reads this data Sv+Cv, performs D-A conversion, and outputs it to a flash light emission amount control circuit (FLM). Next, set the film sensitivity on the timer to control the imprinting time, and in step #115, the signal line (
rp) as "Lou+" to start the imprinting operation of a data imprinting device such as a back circuit (BCKC) which can determine the start of data imprinting and does not have an imprinting time control function. Then, interrupts by the timer are enabled and the timer starts counting. Then, in step #120, the counter interrupt is enabled and a 'Low' pulse is output to the signal line (RL) to operate the release magnet and start the lock-in operation and mirror-up operation. Wait for sufficient time to complete the mirror up operation in step 122. During this time, the pulse from the pulse output circuit (APG) is input to the clock input terminal and is preset in the down counter. The refinement stage number data is decremented each time a pulse is input.Then, the contents of the counter become “
When the signal line (A
P) outputs a "Lou+" pulse to operate the aperture magnet and stop the aperture operation. Then, the timer interrupt is enabled and the process returns to the main routine. Also,
If an interchangeable lens that cannot control the aperture is attached or no interchangeable lens is attached, the counter interrupt may not be activated, so if a certain period of time has elapsed in step #122, proceed to step #123. Then, the counter interrupt is disabled and the process moves to step #125.

In step #125, it is determined whether the control exposure time data indicates a valve. And if it is not a valve #12
Move to step 6.

In step #126, the signal line (IC) is set to “Low”.
outputs a pulse to operate the leading curtain magnet and start the running of the leading curtain. Next, count the exposure time,
When the count ends, the signal line (2C) goes “'Low”.
'' pulse is output, the trailing curtain magnet is operated to start running the trailing curtain, and the process moves to step #135. #1
If it is determined in step #25 that the valve is on, the process moves to step #130, and the front curtain is run.6 Then, the input signal to the input capo (IP,
”.At this time, the back circuit (BCKC)
is not attached, wait until the release button is released and the switch (S2) turns OFF, then turn the switch (S2) off.
2) becomes "OFF", the trailing curtain starts running. On the other hand, when the buck circuit (BCKC) is installed and M/LT is selected, the signal line (I P) is "Low".
”, the buck circuit (BCKC) starts counting the time, and the signal line (BS2) is set to “L”.
oIll”.Then, the back circuit (BCKC
), the signal line (BS2)
The camera body (BD) uses this signal to start the trailing curtain. In this way, in M/LT mode, the camera body (
Exposure time counting starts with a signal input from the BD (BD) via the signal line (IP), and is controlled in 1 sec as the minimum unit, so the exposure time is not precisely controlled, but overall Since the exposure time is long, the error does not have much of an effect on the exposure.

Normally, the timer corresponding to the film sensitivity has finished counting until step #135.
When the timer count ends, a timer interrupt is generated and the signal line (IP) is set to “High” in step #145.
h", the imprinting operation is stopped, counter interrupt is enabled, and the process returns to the main routine.

In step #135, when the exposure time is short, the signal line (IP) remains “Lou+” even if the trailing curtain starts running.
Therefore, in order to forcibly stop the imprinting operation (to prevent imprinting from occurring during winding), the signal line (IP) is set to "High". In step 136, the back circuit (B
In order to stop the imprinting operation by CKC), a pulse of "LOLI+" for a certain period of time is sent to the signal line (C3B), and when this pulse is input from the signal line (CSB), the back circuit (BCKG) stops imprinting. Aborts the loading operation. Then, the counter and timer interrupts are not accepted, and the controller waits until the trailing curtain completes running and the switch (S, ) is turned "ON". Then, when the switch (S,) is turned "ON", the 7-lag RLEF and BCKF are set to 0", and the process returns to step #2 to perform the above-described operation.

When a continuous shooting mode such as interval function or bracket function is selected in the back circuit (BCKC), an L signal is output from the signal line (BS2).
ow'' signal remains input, and the above-mentioned exposure control preparation operation is performed even during the winding operation, and as soon as the winding is completed and the switch (S4) is turned OFF, the next exposure control operation starts. Also, when the release switch (S2) remains “ON”,
Such continuous shooting is performed.

When the camera body (BD) is activated by a signal from the signal line (B S +) of the back circuit (BCKC), automatic focus adjustment is not performed, but the voltage boost of the flash device (FL) is The width of the starting pulse is distinguished between activation for starting the back circuit (BCKC) and activation when a key is pressed in the back circuit (BCKC).
When the key operation in C) is performed, the alpha adjustment operation may be performed automatically.

Furthermore, there are other devices that are not activated when activated by the back circuit (BCKC) but activated when activated by the photometry switch (Sl), such as a buzzer that warns of camera shake. In addition, in order for the microcomputer (BMC) to determine what the start signal is, a back circuit
The signal from C) is a pulse of IJ below Itll lu at a certain time, but if it is input to a separate input port from the switch (Sl), the pulse width can be limited. Such measures become unnecessary.

Note that the back circuit (BCKC) allows exposure time control longer than the maximum exposure time of the camera body only in M/LT mode, but it can be used in any mode as long as the exposure function is selected. Long-term exposure time control may be possible, or even possible when an external function is selected.

Also, during interval shooting, a start signal is sent to the camera body (BD) one minute before starting the shooting operation of one group, and the camera body (BD) exchanges data with the 7 lash device (PL). , the 7 lash device (FL) is starting to boost its pressure. By the way, the flash device continues external pressure for 15 minutes after starting the pressure increase operation.
Very often boosting is continued even after a group of i-shadows has ended. If the interval between groups is very long, boosting the voltage after one group has been photographed is wasted, resulting in a waste of battery power. Therefore, when shooting for one group is completed, data indicating that shooting for one group has been completed is sent from the back circuit (BCKC) to the camera body (BD) (for example, the lowest bit of the back ICP is set to "1"). When this data is input, the camera body (BD) sends a boost prohibition signal to the 7 flash device (FL) (the bit between the 3 bytes of data sent to the flash device (FL) or 4 bytes). prepare the eyes)
The flash device (FL) may stop its boosting operation when this data is input.

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

FIG. 4 shows an external view of the bag (BCK). (1) is the battery lid of the battery compartment, and (2) is the external display section, which indicates that the operation is stopped. (3) shows a key cover for protecting some keys of the operation key, (4) shows a grip part, and (5) shows a part of the operation key.

FIG. 5 shows a state in which the external display section in FIG. 4 is in an operating state and the key cover (3) is open. Explain the function of each key. (6) is a function key to select each function. (7) Selects the mode within each function using the mode key. (8) is the operation key,
Switches between execution and non-execution of each function. (
9) Change the external display one by one using the enter key. (
10) uses the adjust key to change the external display from the control state to the numerical value setting state, and from the numerical value setting state to the control state.

(11) is the up key, and (12) is the grand key to change numerical values in each mode and shift the program line. (13) uses the cursor keys to sequentially advance each digit to be changed when changing numerical values in each mode. (14) is a memory key that imports photometric data from the camera. (
15) Use the memory clear key to clear all the photometric data imported using the memory key.

Figure 6 shows the operating state on the external display, and the EXPO
The P1 mode of the 8URE function is displayed. Each display section will be explained. (16) is a character display section using a 5.times.7 dot liquid crystal display with 10 digits, and displays shutter speed values, color print values, mode names, messages for operating procedures, etc. (17) indicates the display position of the shutter speed value <T> and the fringe value <F>. (18) displays the mode selected in the EXPO8URE7 function. (19) shows each function name, and each time you press the function key (6), EXPO
8URE→(MULT I-M)-4(BRACKE
T)→I M P R I N T→I NTERVAL
-, B&W-, EXPO3URE-+... and so on. MULTI・M77 union and BRAC
The KET7 function is skipped and cannot be selected when the EXPO8URE7 function is not executed.

Also, EXTERNAL7 anxion is EXPO8UR
When the E7 anxion is in the execution state, the force'mera body (BD
) can be executed only when control data from the meter (MET') is input, and cannot be selected using 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 the shutter speed value, and (23) is an index indicating the aperture value. If the shutter speed value is 2 seconds or less, use the “i@” symbol and the aperture value is F3.
If the number is 2 or more, it is indicated with an "=" symbol. (24) is a graphic display section, and (25) is a photometric line, which will be hereinafter referred to as an EV line because it indicates an equal EV value.

(26) indicates a P mode with a slope of 2/3, which is a high-speed program in the program line. Depending on the lens, the limit is Fl, 4 on the open side, and F22 on the aperture side.
Further, arbitrary aperture restriction is performed between F2 and F8 and Fll. In the character display section, lowercase numbers indicate 1/4 EV units, and control points at the intersection of the program line and the EV line < 1/60. F4
+1/4EV > is displayed.

FIG. 7 shows the P2 mode in which the slope of the program line is 1/1, and FIG. 8 shows the P3 mode in which the slope of the program line is 172.

As can be seen from this figure, in the P1 mode, the dots on the graphic display are displayed at IEV pitch on the F value side, and in the P3 mode, the dots on the graphic display are displayed on the IEV pitch on the exposure time side so that they are aligned in a straight line. Table 1 shows the transitions between each function and each mode. The double-framed modes are initialized at power-on reset, such as when replacing batteries. The operating procedure for each mode in each function will be explained.

FIG. 9 shows the P2 mode of the EXPO3URE7 mechanism. Use the FUNC key (6) to move the "1" mark to select the EXPO8URE7 function, then use the MODE key (7) to display the mode name "PROGRAM2" on the character display section (16) and switch to P2 mode. The mode display section (18) of EXPO8URE7
The mark is lit. In the graphic display (24), the camera shutter speed control limit 1740
00 seconds and 30 seconds and lens control limits F1.4 and F2
2, the program line is restricted. In addition, the slope part of the program line is 17250 seconds and F in the initial setting state.
It passes through point 5.6. Next, the OPE key (8)
When the EXPO8URE7y button is pressed, the EXPO8URE7y button enters the execution state, and the "■" mark (21) lights up as shown in Fig. 10, and the EV line (25) corresponding to the photometric value appears.

Next, press the ENT key (9) to display the mode name (“PR”).
OGRAM2") to the control display (hereinafter referred to as 0UTPUT display). In this case, the program line and E
The shutter speed value 1/60 second and F2.8, which are the intersections of the V lines, are displayed on the character 1 section (FIG. 11). In the 0UTPUT display, the UP key (11),
The DOWN key (12) allows the slope of the program line to be shifted. , FIG. 12 shows a state in which the UP key (11) has been moved to the right. Next, when you press the ADJ key (io), the display switches to the setting display (hereinafter referred to as the INPUT display) and first asks you for the FMAX value.

In Fig. 13, the FMAX value shows F22 due to the initial setting. DOWN key (12) +: Set the FMAX value to F.
When lowered to F8, the slope of the program line stops at F8, as shown in FIG. 14, and a restriction is added. F
After setting the MAX value, press the ENT key (9) to
Proceed to MIN. In FIG. 15, the character display section is switched to FMIN value setting. For initial settings, Fl,
4 is already displayed. With the UP key (11), the FMI
Change the N value. FIG. 16 shows a state where F2.8 is set. Next, when the ENT key (9) is pressed, "COMPLETED" indicating that the setting is completed is displayed on a part of the character. When the completion display appears, press the ADJ key again to switch to the 0UTPUT display, and the character
Camera control values are displayed on the display section (FIG. 18).

Next, the S mode (shutter speed priority mode) of EXPOSURE 77 will be explained.

Press the MODE key (7) to display “S” on the character display.
MODE” display and select S mode, the first
It will be displayed as shown in Figure 9. Here, the OPE key (8)
It is in the running state.

(Fil, 4, and F22 are limited by the lens.) When you switch to 0UTPUT display with the ENT key (9), an underline (cursor) will appear in the shutter speed value display section of the character display section (16). is displayed (Figure 20). The underline indicates that the numerical value can be changed using the UP key (11) or the DOWN key (12). When the time is changed from 17125 seconds to 17500 seconds using the UP key (11), the result becomes as shown in FIG. At the same time, the aperture value also changes to the appropriate exposure value.

Next, EXPO8URE7y A mode (7) A mode (aperture priority mode) will be explained. MODE key (7)
Displays “A MODE” on the character display and selects A mode.
The screen is displayed as shown in FIG. ○ It is in the execution state by pressing the PE key (8). Also, with the camera I) 30 seconds (
The limit is 174,000 seconds. When the ENT key (9) is used to switch to the 0UTPUT display, an underline is displayed in the aperture value display section of the character display section (1G), indicating that the numerical value can be changed (FIG. 23).

From F5.6 to F11 +2/ by UP key (11)
When changed to 4EV, it becomes as shown in Fig. 24. At the same time, the shutter speed value also changes to the appropriate exposure value.

Next, EXPO3URE7y/Kushia>(r)M mode (manual mode) will be explained. MODE key (7
), “MMODE” is displayed on the character display section (16).
” display and select M mode, it will be displayed as shown in Figure 25. It is activated by pressing the OPE key (8). Also, there are restrictions on shutter speed and aperture depending on the camera and lens. is receiving the ENT key (9
) to switch to 0UTPUT display as shown in Fig. 26. At this time, the shutter speed value display section shows ANGUA 1.
- A line is displayed indicating that the value can be changed (Figure 26). 1/1. from 17250 seconds with the UP key (11). If the time is changed to OO0 seconds, the result will be as shown in Fig. 27. Next, use the cursor key (13) to move the underline (cursor) to the aperture value display area (Fig. 28).
Press DOWN key (12) to change from F5.6 to F2,8+2
When changed to /4EV, it becomes as shown in Fig. 29.

When the cursor key (13) is operated again, the underline moves to the shutter speed value display area, and the shutter speed can be changed.

Next 1: Explain the long time mode of the EXPO6URE7 function. When the long time mode is selected by displaying "M MODE/L, T" on the character display section by pressing the MODE key (7), the display as shown in FIG. 30 is displayed. The OPE key (8) is in the execution state. Press the ENT key (9)
When you switch to the UT display, it will look like figure f531. The underline (ν) is attached to the aperture value display area to indicate that the aperture value can be changed, but the cursor key (13)
) is invalid, and the shutter speed value (long time)
cannot be changed with 0UTPUT display. Next, A.D., J.
When the key (10) is used to change to the INPUT display, the third
As shown in Figure 2, the shutter speed value can now be set. The shutter speed value (long time) can be set in a range of 10 seconds to 9990 seconds, and can be set in units of 10 seconds.

The underline is first set in the thousandth digit, then moves to the hundreds digit, the tens digit, the first digit, and then back to the tens digit.
UP key (11) or DOWN key (1) respectively.
2) to change the numerical values (Figures 33 and 34). When the setting of the shutter speed value (long time) is completed, use the ADJ keys (i, o) again to set the OUTPUT.
Switch to T display.

Camera control values are displayed on the character display section (FIG. 35).

Next, the AVERGE mode in which the average calculation of the MtJLTI/M (multimetering) function is performed will be explained. This MULTI・M function is F when the EXPO3URE function is in the execution state.
It can be set using the UNC key (6). EXPO8U
While the RE77 function is in the running state, select the MULTI-M7 function using the FUNC key (6), then use the MODE key (7) to display the mode name "AVERGE" on the character display section (16).
Set to AVERGE mode (Figure 36). Here E
The mode of the XPO8URE7yction is set to P mode according to the mode display. It is in the execution state by pressing the OPE key (8), and it is in the state where it can take in photometric values by pressing the M key (14). The controllable range is shown at the top of the graphic display from -6(E V ) to 6(E
The indicators up to V) are displayed on the LCD. In addition, the graphic display section has an index display ("-1") that indicates the width of the deviation during highlight calculation and shadow calculation, and an index display ("
-11■") are placed on the left and right. The 1 point display ("■") located one step above the index in the middle is the first metering point, and usually it is located in the middle (0 position ) position.When 0UTPUT is displayed using the ENT key (9), EXPO8U is located at the first metering point.
The shutter speed value and aperture value calculated in the P mode (for example, P2 mode) of the RE7 action are displayed on the character display section (16) (FIG. 37). At this time, display 6 “A I+” of “AVERGE” in the middle, and
Indicates the VERAGE mode. Next, when the M key is operated, the value of the first photometric point located one step above the index is taken in, and the one point display (1r) moves to one step below the index display. At the same time,
A second photometric point appears one step above the index display with respect to the first photometric point (FIG. 38). At this time, the value of the first photometry point that has been imported is in an AE-locked state, and the character display section (16) shows the value calculated in the mode selected by the EXPO8URE77 function (in this case, P2 mode). Displays the shutter speed value and fringe value. Press the M key again (14
), the value of the second metering point is imported, the first and second metering points move to a balanced state with respect to the 0 position reference, and the character after display shows the first and second metering points.
The photometric point values are averaged, and the shutter speed value and frit value in P2 mode are calculated and displayed (Figure 39). At this time as well, the third photometric point appears one step above the indicator display. Below, M key (14)
By operating sequentially, it is possible to import and display photometric values up to 8 points, but from the 9th point onwards,
It is designed to replace the first point, and the latest 8 photometric points can be taken in and calculated. #
&40 shows a state in which three photometric points have been captured, and FIG. 41 shows a state in which the highest eight photometric points have been captured. Here, when the MODE key (7) is operated, the character display section (16) changes from displaying 0UTPUT to displaying the mode name, and displays "CENTER". CENTER mode is a mode that calculates the average of the MAX and MIN values of the photometric values, and the graphic display section shows the MAX and MIN values of the photometric points taken in one shot from the index display based on the zero position. moves to a balanced position (Figure 42).
Next, by pressing the ENT key (9), 0UTPUT is displayed, and the character display section (16) displays the calculated shutter speed value and aperture value, and the CENTER mode “
C" is displayed (Fig. 43). Press the MODE key (7) again.
The mode changes to the HIGHL I GHT mode, and the mode name "HIGHL IGHT" is displayed on the character display section. At the same time, the point display indicating the MAX value of the captured photometric point moves to a position of plus 2 or 3 Ev, and the entire captured photometric point display moves based on the point display indicating the MAX value. Figure 44). At this time, the number of photometric points protruding from minus 6 Ev is displayed at the minus 6 Ev position. Next, press the ENT key (9) to display 0UTPUT, and the character display section displays the shutter speed value and aperture value that have been set based on the highlight criteria, as well as "H" for HIGHLIGHT mode (No. 45).
figure). MODE*-(7)1. :yo'), 5HA
The mode changes to DOW mode, and “S” is displayed on the character display.
A mode name display of "HAD OW" is shown.

At the same time, the point display indicating the MIN value of the photometric point captured moves to the -2.7Ev position, and the entire captured photometry point display moves based on the point display indicating the MIN value ( Figure 46). At this time, the photometric points that protrude beyond +6 Ev are displayed at the position of +6 Ev by that number. Next, press the ENT key (9) to display 0UTPUT, and the shutter speed value and aperture value calculated based on the shadow reference, and "S" for ST-I A D OW mode are displayed on the character display section ( Figure 47). MO again and again
When the DE key (7) is operated, the mode returns to the AVERAGE mode and the sequence is repeated. The MULTI/M function has one more mode in addition to the mode described above. When the EXPO3URE function is in the M (manual) mode, the MULTI/M function becomes the MANUAL mode, other modes do not appear, and the MODE key (7) is disabled. MANUAL
In the mode, the control value is only EXPO3URE7y
This is the setting value in the M mode of the function, and the 0 position of the index display is the setting value. Therefore, as shown in FIG. 49, the photometric value from the camera exists at a position that is shifted by the amount of shift from the set value. Press the ENT key (9) to display 0UTPUT, and the character display section (16)
The shutter speed value and fringe value, which are the set values, are displayed, and "M" is displayed between them (FIG. 50). Since the mode is activated by pressing the OPE key, photometric points are loaded by pressing the M key in the same way as in the other modes. Figure 51 has one piece, tIIJ52 figure has two pieces,
FIG. 53 shows a state in which eight items have been captured. In these cases, the character display section (1G) remains unchanged at the set value. As shown in FIG. 53, the photometric distribution for a certain subject can be determined at a glance using a graphic display. Here, press the UP key (11) or DOWN key (12).
) allows the entire photometric distribution map made up of the captured photometric points to be moved left and right. In FIG. 54, since there is an underline in the shutter speed value representation area, the shutter speed value is changed at the same time as the photometric distribution map is moved by pressing the UP key (11). Therefore, this function makes it possible to perform exposure control according to the brightness distribution of the subject, and furthermore, it is possible to perform exposure control according to the brightness distribution of the subject.

The width of highlight and shadow exposures, which are fixed at 2.7Ev, can also be changed arbitrarily. If you move the underline to the aperture value using the cursor keys, the aperture value will be changed. In the above explanation, the most appropriate point on the photometric distribution map is selected by pressing the UP key (11) or the D
By arbitrarily changing the shutter speed value or aperture value using the OWN key (12), the O
You can move the camera to different positions and set the appropriate value for the subject at your own discretion. In other words, the MANUAL mode of the MULTT/M function can be said to be a type of metered manual in commonly known terms.

Next, the BRACKET function will be explained. This function shifts the exposure value based on the captured photometric data. It is possible to shoot with a shift of up to 97 frames, and the start value, shift width, and number of frames can be set. This function is also skipped and cannot be selected if the EXP O'SURE 7 function is not in the execution state.

Figure 55 shows the state of mode name display,
The E7 action indicates that the P mode is selected, and an index indicating the shift start value and shift amount is displayed at the top of the graphic display section (24). This index is common to the one that indicates the photometric range of the MULTI-M77 unit, but it is also possible to provide a different index. An index indicating the shift range is displayed on the graphic display section. Also, BRACKET7
Anxion is in a non-execution state. ENT key (
9), the display changes to 0UTPUT as shown in FIG. The character display section (16) displays the amount of deviation from the reference value and the remaining number of 7 frames. Also, OP
It is in the execution state by pressing the E key (8), and therefore, a new display showing the operating state of the BRACKET 77 linkage appears below the indicator in the same shift range on the graphic display section (24). Next, when the ADJ key (10) is used to change the 0UTPUT display to the INPUT display, as shown in Figure 57, the character display section (16) first displays a message "FROM" to set the start value for the shift. appears. Here, enter the underlined numbers as UPS-(11)t1iDOWN*-
(12) When changed to the desired value, the indicator and the operation display move as shown in Fig. 58 together with the keystrokes.Next, set the shift width using the ENT key (9). The message “5TEP” is displayed on the character display section (1
6) (Figure 59). The shifting width is 1/4Ev.

It can be selected from four types: 1/2 Ev, I Ev, and 2 Ev, and is set by changing the underlined value using the UP key (11) or the DOWN key (12) (Fig. 60). Next, press the ENT key (12) to
As shown in Figure 1, the message "FRAME" appears on the character display section to set the number of frames to be photographed. U
When you use the P key (11) or the DOWN key (12) to change and set the underlined value (in this case, 9 frames), the width of the index and the operation display will change to the width of the shift in the graphic display section. The shift range is displayed continuously from the start value to the final shift value (Figure 62). Next, by pressing the ENT key (12), the message "COMPLETED" is displayed on the character display section (16), indicating that the setting is complete.

Here, if you repeatedly press the ENT key (12), the
Return to ROM" and repeat each setting display. ADJ key (10
), the INPUT display changes to the 0UTPUT display, and the character display section (16) displays the amount of deviation from the reference value and the remaining number of 7 frames (FIG. 64). Next, when you release the camera, the light metering value at that time will be locked, and the exposure value of each 7 frames will be shifted based on that metering value. Pl.

The camera is controlled 11 by conversion using the shutter speed value and aperture value calculated in one of P2 to P3 modes. FIG. 65 shows a state in which the camera has been released once, and the character display section (16) displays the amount of deviation of the exposure value controlled by the next release from the reference value and the number of remaining 7 frames. Then, the graphic display section (2
4) changes so that the range from the next control (N output) value to the final (exposure) value is displayed in the operation display.

FIG. 66 shows a state in which the camera has been released twice, and FIG. 67 shows a state in which the camera has been released eight times. The remaining number of 7 frames on the character display section (16) is “
1'' is displayed, indicating that there are 17 frames remaining, and only the final value is displayed on the graphic display section (24).

Next, when you release the camera to take the last 7 frames you have set, the character display area (16) and graphic display area (24) will be reset to the initially set values, and the new values will be displayed again as shown in Figure 68. The state changes to a state in which photometric values can be taken in, the display state becomes the same as that shown in FIG. 64, and camera control can be performed repeatedly. EXPO8URE is displayed on the external display section (2) when the BRACKET77 function is in the running state.
When changing to the BRACKET7 movement and executing the BRACKET7 movement, if the EXPO8URE77 movement selects P, S, or A mode, the Ev line will move parallel to the program line in the graphic display area. , and when M mode is selected, the aperture value lines move in parallel, so BRACK
It can be easily confirmed that the ET7 action is being executed.

Next, the imprint function will be explained.

When the imprinting function is selected by operating FUNC4-(6), the mode becomes an exposure control data imprinting mode, and when the OPE key (8) is operated, the mode becomes operational. At this time, if the exposure function is not selected, the line diagram and Ev line at that time will be displayed (Figure 69).
. When the ENT key (9) is pressed, the control value (camera control value) calculated by the back circuit (BCKC) at that time is displayed (FIG. 70) and this data is imprinted.

On the other hand, if no exposure function is selected, E
When the NT key (9) is pressed, data sent from the camera body (BD) is displayed as data to be imprinted.

In this case, no graphic display is performed.

Press the MODE key (7) to enter year/month/day mode.
The mode name is displayed on the character display section (16) (
Figure 71). Next, press the ENT key (9) and the data from the calendar microcomputer (CAMC) will be displayed (7th
Figure 2). If a photograph is taken in this state, the data of this character display section (16) will be imprinted. Also, if you press the ADJ key (10) in the state shown in Figure 72, you can change the data, and a cursor will be displayed in the year data display area (
Figure 73).

Then, when you press the cursor key (13) twice, the cursor is displayed below the day data display area, and the UP key (13) in Figure 75 is displayed.
1) is pressed three times to change the day data from the 12th to the 15th. If the ADJ key (10) is pressed in this state, the display state shown in FIG. 75 will be created and this data will be imprinted. Incidentally, imprinting is performed even in the display state shown in FIGS. 73 and 74. Also, if the calendar data is changed (
The display data (data from the calendar microcomputer (CAMC)) is also changed. Each time the MODE key (7) is pressed in this state, the imprint mode is changed in the order shown in Table 1, and the mode for hours, minutes, and seconds is changed, and then the MODE key (7) is pressed.
When the E key (7) is pressed, the up-count mode is entered. The mode name display state of this up count mode is 7th.
This is Figure 6. If you press the ENT key (9) in this state, the 7th
The display state shown in Figure 7 will be obtained. When the ADJ key (10) is pressed, a cursor appears and the data corresponding to the cursor position can be changed using the up key (11) and down key (12). 0 for up key (11)
→１→・・・・・・→9→−→Blank→0・・・・・・
・The down key (12) changes in the reverse order.

FIG. 79 shows a state in which the data change has been completed in this manner. When the ENT key (9) is pressed in this state, a cursor appears as shown in FIG. When photographing is performed in this state, the data incremented by "1" is sequentially imprinted. Note that there is no carry to - or blank digits. When MODE+-(7) is pressed in the up count mode, the mode changes to the down count mode, with the mode name displayed as shown in FIG. 81. The initial data is set in the same procedure as in the up-count mode, and the display at the end of the setting is shown in Fig. 82. In both of these modes, data that is sequentially changed and imprinted during photographing is displayed on the character display section (16).

When the MODE key (7) is pressed in the down count mode, the fixed data imprint mode is entered, resulting in the display state shown in FIG. 83. If you press the ENT key (9) below, the ADJ
When the key (10) is pressed, the display state shown in Fig. 85 is displayed, and the cursor key (13), up key (11), down key (
12), change the data as shown in Figures 86 and 87, and press the ENT key (9) to change the data to Figure 88.
It will be in the state shown in the figure.

In this mode, the set fixed data will be imprinted unless the PE key (8) or MODE key (7) is operated.

When the B&W7 function is selected by the FUNC key (6), the imprinting time for monochrome film is controlled. With this function, mode switching etc. cannot be performed, and the setting state of the imprint function is maintained. When this function is selected, it is an imprinting function for monochrome film, and when the B&W function is not selected, it is an imprinting function for color film. Note that when the B&W7 function is selected, the imprint function may be disabled so that the same operation as the imprint function can be performed. When the B&W7 angle is selected, the imprinting time becomes longer.

Next, the INTERVAL function will be explained. This function allows the camera to be activated at certain time intervals to automatically take pictures in sequence.

In the interval function, the interval time, the number of 7 frames during each interval shooting (hereinafter referred to as the number of frames), and the number of repetitions of the interval (
(hereinafter referred to as the number of groups), the first release start time of interval shooting (hereinafter referred to as the start time)
can be set.

FIG. 89 shows the mode name display of the interval function. It is in a non-execution state, and the ENT key (9) is disabled. Further, the graphic display section (24) is in a non-display state in this function. When this interval function is put into an execution state by pressing the OPE key (8), execution starts toward the start time. Also, if you want to immediately execute the first Lurise of the interval, press the OPE key (8) to activate it, then release the camera to cancel the start time and start. . Next, press the ADJ key (10
), the 0UTPUT display changes to the INPUT display, and as shown in FIG. 90, a display state in which the interval time can be set is first entered. “■” for INTERVAL time is displayed on the character display section (16), and the hour, minute,
“H (Hour), M (M 1
nute＞.

The characters "S (S econd)" are displayed together with the numerical value.

Also, the underline indicates where the numerical value can be changed,
Change the numerical value using the UP key (11) or DOWN key (12), and move the changed point using the cursor key (13) to set the interval time (Figure 91).The interval time is from 0 seconds to 99 hours and 59 minutes. It can be set up to 59 seconds. Next, press the ENT key (9) to
As shown in Figure t592, the setting display changes to 7 frame number ("F") and group number ("G"). Press the UP key (11) or DOWN key (
12), move the changed part using the cursor keys (13), and set the number of 7 frames and the number of groups (No. 93).
figure). Although the number of 7 frames can be set up to a maximum of 97 frames, when the BRACKET7 function is in the execution state, priority is given to the number of frames in the BRACKET7 function. The number of groups can be set up to 99 groups.

Next, by pressing the ENT key (9), the display changes to the start time setting display as shown in FIG. The start time can be set to any day, hour, or minute.

The character display section (16) shows “5TART time”.
"S" is displayed, and "D (
D ate), H (Hour) v M (M 1nu
te)" will be displayed together with the numerical value. Change the numerical value in the underlined part using the UP key (11) or DOWN key (12), move the changed part using the cursor keys, and set the start time. Next, press the ENT key (9
), the character display section (16) is set to C.
0MPLETED” display (figure omitted), then A
By pressing the DJ key (10), the INPUT display is changed back to the mode name display (FIG. 95). With this, when starting the interval function, OP
Press the E key (8) to enter the execution state, then press the E, NT key (9)
When 0UTPUT is displayed, the start time is displayed on the character display section (16) as shown in FIG. After the first release of the interval is executed, the character display section (16) displays the remaining time until the next release in hours, minutes, and seconds ("H, M, S"). Figure 97).

FIG. 98 is a block diagram showing a specific example of the buck circuit (BCKC). (CMC) is a control microcomputer that manually controls functions, modes, data settings, exposure calculations, display data creation, imprint data creation, and imprint operations.

Furthermore, display sections (S D ), (D D ), which will be described later,
(CD') control, calendar microcomputer (C.A.M.C.
) and the display microcomputer (DMC), and the camera body (BD). (C.A.
MC) is a calendar microcomputer that handles calendaring data for imprinting, interval control, and long exposure time (
It also performs long-time control, etc.

Switch (M) is a switch that is closed by pressing the memory key (14) in Figure 5, switch (CL) is a switch that is closed by operating the memory clear key (15), and (CUR) is a cursor. Switch that is closed by operating the key (13), (E N T ) is the enter key (9)
The switch (UP) is closed by operating the up key (
(DWN) is a switch that is closed by the operation of Grankey (12). These six switches are connected to each input port of the control microcomputer (CMC), and are also connected to the AND circuit (A
G) is connected to the interrupt terminal (INTB).

Therefore, even if the control microcomputer (CMC) has stopped operating, the control microcomputer (CMC) will start operating if any switch is set to "P○N".
) is a switch that is closed in conjunction with the operation of the operation key (8), and (FUN) is a switch that is closed in conjunction with the operation of the operation key (8).
) is a switch that closes in conjunction with the operation of (ADJ), a switch that closes in conjunction with the adjustment key (10),
(MOD) is a switch that is closed in conjunction with the operation of the mode key (7). These four switches are connected only to the input ports of the control microcomputer (CMC), so even if these switches are turned "ON", the control microcomputer (CMC) is not activated.

Next, the operation of the control microcomputer (CMC) will be explained based on the chart 70 of the control microcomputer (CMC) in FIG. 99. First, from the camera body (BD) to the signal line (C3
When B) falls to “Low”, the interrupt terminal (INTA)
The operation starts from the NO2O step. First, since the camera has been activated, set the signal line (BS,) to Hi.
gh'', then enable interrupt operation by the interrupt terminal (INTA), and then determine at what timing the interrupt signal was input from the camera body (BD). Namely, No. 2
In the step, it is determined whether the state is waiting for data input or not. If the state is waiting for data input, the imprint data (T
V.

Av) or calculation data is input in step No.3. As mentioned above, when the signal line (C3B) falls to "LoIII", the signal line (BIO)
"PIigh" for imprint data, "Low" for imprint data
It can be identified because it is . When it is determined that imprint data is input, the sent data is read and it is determined in step No. 5 whether the forwarding function is selected. N005
If it is determined in step 1 that the forwarding function is not selected, no forwarding operation is performed and the process moves to step 1.5. On the other hand, if the forwarding function is selected, the process moves to step 6 (No) and sends data corresponding to the selected forwarding mode to the LED drive circuit (LDR) for projection. This operation is performed on the signal line (C3L
A synchronizing signal is sent to D), and data is sent sequentially 4 bits at a time. Then, the signal line (LDE
When the display operation of the drive circuit (LDR) is operated with N ) set to "LOIII", the segment's light emitting diode (
LED) is dynamically driven according to the forwarding data,
Imprinting is performed. Then, the control microcomputer (CMC) counts the firing time according to the film sensitivity read from the camera body. Note that when using the B&W function, even if the read film sensitivity is the same data as the forwarding function, a different (longer) time count is performed.

When the count ends, the signal line (LDEN)
is set to "Higb", and the imaging operation by the drive circuit (LDR) is stopped. In addition, when the rear curtain starts running on the camera body (BD), “
LoIII" pulse is output. Then, at this time as well, an interrupt signal is input to the interrupt terminal (INTA), and since it is not waiting for data input at this time, the process moves to step No. 11. Then, No. If it is determined in step 11 that the 4-loading operation is in progress, the process moves to step 10, where the signal line (LDEN) is set to "HigI+" and the forwarding operation is forcibly stopped.As a result, Directional feeding is also prohibited during film winding.

No.

In step 15, press the switch (SCN) on the camera body.
is “ON”. And switch (S C
N) is "ON", No, steps 16 to 21 are not performed, and No, the process moves to step 40. On the other hand, if the switch (SCN) is "OFF", then it is determined whether or not it is in the count-up mode. and,
If it is the count-up mode, "1" is added to the lane star CR in which forwarding data has been set, and the process moves to step No. 40.

On the other hand, if the mode is not the count-up mode, it is then determined whether the mode is the count-down mode. Then, in countdown mode, subtract "1" from the contents of register CR,
No, proceed to step 40.

On the other hand, if it is not the countdown mode, then it is determined whether it is a bracket function or not, and if it is a bracket function, "1" is subtracted from the register BR in which the number of frames of the bracket function is set, and the number is 4.
If it is not a bracket function, go to step 0 and go to step 40. Note that data transmission is performed even when the switch (SCN) is "ON", but the switch (SCN) is determined between steps N004 and No.5, and the switch (SCN) is set to "ON". If it is "ON", the process may immediately proceed to step 40 (No).

No, in step 3, it is not forwarding data (signal line (
BIO) is determined to be “Higl+”),
If No, the process moves to step 25, and data is read from the camera body. If the exposure function is selected, the process moves to step No. 27 and waits for the signal line (BIO) to become "Low". Then, when the signal line (BIO) becomes Lou+'', it outputs the back ICP (``80H'').Camera body (BD)
When this back ICP is input, the signal line (BIO)
is High, and the signal line (C8B) is set to “Lov+”.
”, wait for the control microcomputer (CMC) to perform the calculation, and when enough time has elapsed for the calculation to be performed, set the signal line (BIO) to “Lou+”.The control microcomputer (CMC): No, output the back ICP at step 28 and release.

Performs the operation of the output calculation subroutine. When the arithmetic operation is completed, the signal line (BIO) is waited for to become "Low", and when the signal line (BIO) becomes "LoI11", the control data (T
Send data such as VtAv), exposure control mode, non-interlocking, release enable/disable, etc., and proceed to step 40.

When the control microcomputer (CMC) is activated by the pulse output to the signal line (CSB) when the camera body (BD) starts operating, or when the pulse starts running of the trailing curtain. When input, if it is not a 4-inclusive function or if the imprinting operation has been completed, the process immediately moves to step 40 (No).
Switch (M), (CLL(CURL(ENT)t(U
P), (DWN) are turned “ON” and the interrupt terminal (INT
When an interrupt signal is input to B) or the operation due to an interrupt from the interrupt terminal (INTA) is completed, the operation starts from step 40 (No). No, in step 40, reset the timer register (for counting operating time) TIR and set the flag IOF, which determines whether data is input or output from the calendar microcomputer (CAMC), to "1". , move to step 42. No. 42
In the step, it is determined whether the flag IOF is θ'', and “
1”, read the data from the calendar microcomputer (CAMC), reset the 7-lag IOF to “0”, and
o, move on to step 47. On the other hand, if it is determined in step 42 that the 7-lag IOF is "1", the data is sent to the calendar microcomputer (CAMC) and the 7-lag IOF is determined to be "1".
Set the lag IOF to 1'' and move to step No. 47. The method of data exchange is the signal line (C8CA
) is set to "Low", the signal line (Ilo) is set to "Low" when outputting data, and the signal line (Ilo) is set to "High" when inputting data. When the signal line (C8CA) becomes "Lou+", an interrupt is applied to the calendar microcomputer (CAMC), and a pulse for data exchange synchronization is output from the calendar microcomputer (CAMC). In synchronization with this pulse, 4-bit data is sequentially exchanged via the data bus (DBUSI). From the calendar microcomputer (CAMC) to the control microcomputer (CM
The data sent to C) is the current time of 9:09:01 on January 1, 2017, the time until the start of the next shooting operation for interval shooting, and 1 minute and 1 second, and whether interval shooting is in progress. , data indicating whether or not interval shooting has ended. Therefore, the control microcomputer (CMC) creates imprint data based on these data, and also creates data for displaying the remaining time until the start of the next shooting operation during the interval function, and furthermore, when the interval end signal is input. This will cancel the interval function. In addition, the data sent from the control microcomputer (CMC) to the calendaring microcomputer (CAMC) includes the start date, hour, and minute of interval shooting, the hour, minute, and second indicating the interval of interval shooting, the number of groups of interval shooting, There is data such as the number of 7 frames for interval shooting, the set exposure time in M/LT mode, whether the interval function is selected, and whether the M/LT mode is selected.

No, in step 47 switch (M) ~ (MOD)
to determine whether a key operation is being performed. If no key operation is performed, the process immediately moves to step 50 (No). On the other hand, if a key operation has been performed, the operation is performed according to the states of the switches (M) to (MOD) and the state of the control microcomputer at that time, and the answer is No.

In step 49, the signal line (BS+) is set to Low'' to start the camera body, and the process moves to step No. 50. This subroutine No. 48 is the 103rd and 104th subroutine
The detailed operations are omitted since the relationship between the operation of each key, the setting data, and the display has already been described.

No. 48 step subroutine and no.

When the operation of step 49 is completed, the interrupt terminal (INTA
) and sends display data to the display microcontroller (DMC). In this operation, first, the signal line (DEN) is set to "Low" and the display section (S
D ), (D D ), and (CD ) are in the operating state, and then the signal line (C8DM) is set to "Low" to notify the display microcomputer (DMC) that data will be output, and the signal line (DCK2) is Output the synchronization pulse and
Send data bit by bit. The display microcontroller (
DMC) will be described later based on the operation. Note that although the enable terminal is used in the diagram, the signal line (D
EN) becomes “Loul+”, the display section (S D
), (CD), and (DD).

When the data transfer is completed, in step 52, it is determined whether any of the switches (M) to (MOD) is turned on, and if it is turned on, the register TIR is reset. , if none of the switches are “ON”, add “1” to the contents of register TIR,
No, proceed to step 55. Then, in step No. 55, it is determined whether the contents of the register TIR have reached a certain value "K", and if it has not reached iiK", then
Move to step o, 42, and repeat the same operation. And no.

When it is determined in step 55 that the contents of the register TIR have reached "K", no key operations or data exchange with the camera body (BD) are performed (so that a certain period of time has elapsed, and then , and this island is connected to the signal line (D
E N ) is set to "High" to stop the operation of the display section, and to enable operation by an interrupt signal to the interrupt terminal (INTB), the operation is stopped.

FIG. 100 is a 70-chart showing a specific example of the calculation subroutine No. 29 in FIG. 99. First, it is determined whether the bracket function is selected, and if it is not selected, the A7 lag is reset. If it is selected, it is determined whether the bracket function is operating, and if it is not operating, the A7 lag is reset. Set. Then, after resetting or setting the A7 lug,
Calculate the Ev value using data from the camera body (BD).

On the other hand, if the bracket function is in operation, once the operation is started, the externally determined Ev value is not changed, so the bracket calculation operation is started.

Once the current Ev value is determined, the meter (MET
) is imported, and if so, it is set as an external function and the meter (ME
The data from T ) is used as the control value. Note that if the control limit is exceeded, the limit value is used as the control value in the same way as the calculation in the camera body (BD). If there is no data from the meter (M ET ), then it is determined whether the mode is M or M/LT mode, and if it is in this mode, the manually set T v and A v are output. On the other hand, M, M/L
If it is not the T mode, then it is determined whether the multi-7 function is selected, and if the multi-function is selected, the control Ev value is calculated based on the stored Ev value.

A subroutine for this multi-function calculation is shown in FIG. 102. When in center mode, the maximum Evmax and minimum Ev of the stored Ev values.
Find min, and from these two values (E vmax + E
vmin)/2 to find the control Ev. If it is not the center, it is determined whether it is the highlight mode, and if it is the highlight mode, the calculation of E vmax -2, 3 is performed on the maximum value of stored Ev, and the control Ev
Calculate. If it is not highlight mode, then it is determined whether it is shadow mode or not, and if it is shadow mode, Ev pupil in + 2.7 is added to the minimum value Ev in of stored Ev.
Then, the control Ev is calculated. If it is not the shadow mode, it is the average mode, and in this case, the calculation is performed to calculate the control Ev.

In FIG. 100, when the multifunction is not selected, the Ev from the camera is set as the control Ev.

Then, based on the obtained control Ev, P l, P 2
．． P3. A. Calculation is performed according to which one of the eight modes is selected. A specific example of this calculation subroutine is shown in FIG. This calculation is first performed as follows: E vmax (= T vmax + A vmax)
< E VtE vLIlin (= T vmin+A
vn+in)>E v, the control is out of interlock, so the limit value is set as the control value, the out of interlock flag is set, and the process returns to the main routine.

On the other hand, in and out of interlocking, operations are performed in accordance with the order shown in the flowchart, a control value is calculated, the out-of-interlocking flag is reset, and the process returns to the main routine (FIG. 100). In addition, in the camera body (BD), when the calculated value exceeds the control limit, the mackerel uses the limit value as the calculated value and outputs the set value as is, but in the back circuit, the limit value is used as the set value, and then The set value was changed by recalculating from Ev and the limit value. Also, for Tomaji in program mode,
It is now possible to set the limit aperture value (not the maximum aperture value or the maximum aperture value).

When the control T v and A v are determined, 7 lag A is “1”
If it is set to ``1'', it means that the bracket function is selected and no calculation is being performed, and the operation shifts to the calculation operation for brackets.Also, while the bracket function is in operation,
The process moves on to calculation for bracketing for the next photograph. first,
It is determined whether the mode is M or M/LT, and outside the M or M/LT mode, the aperture value is moved by the number of frames of the shift amount (the number of times of next shooting) and the A7 lag is reset.

On the other hand, P,,P2. P3. In the A and S modes, Ev is moved by the shift amount of 7 lems, the A7 lag is reset, and the process moves to the T Vt A v calculation subroutine.

When TvlAv is calculated in this way, the bracket function is selected, shooting for the set number of frames is completed, and the signal line (B S 2) is set to Low.
Determine whether Then, if "Loa+" is reached, a release disable signal is set to prevent the photographing operation from being performed, and if the above-mentioned conditions are not met, the release disable signal is reset and the process returns to the main routine.

FIG. 105 is a 70-chart showing the operation of the current microcomputer (CAMC). First, the signal line (IP) on the camera body (BD) is "L'ow" when the exposure control operation starts.
'', the interrupt operation by the interrupt terminal (INTA) starts. Then, in step STI, the timer interrupt (1
sec) and moves to Sr2. In step ST2, it is determined whether the switch (SCN) is "ON", and if it is "ON", the interval and M/LT operations are not performed and step 5T20
to move to. On the other hand, if the switch (SCN) is "OFF", it is determined whether or not interval photography is being performed, and if it is not interval photography, then it is determined whether or not M/LT mode is being used.

And if it is an M/LT card, the signal line (BS2
) is set as "Lou+", and if the mode is not M/LT mode, the process directly proceeds to step 5T20.

When it is determined in step Sr1 that it is interval photography, the remaining time until the start of interval photography is reset, and the signal line (B S 2) is set to "LoI11". And register I where the number of frames is set
“1” is subtracted from FR, and the contents of register IFH become “0”.
'', the process moves to step 5T20. On the other hand, if the contents of the register IFR are 0'', then "1" is subtracted from the register IGR in which the number of groups is set,
Determine whether the value has become "0". Then, if it is “0”, set the interval end signal and 0”
If not, set the remaining time. And M/LT
Determine whether it is in M/L T mode and set the signal line (B s 2) to “High” if it is not in M/L T mode.
and in the M/LT mode, the signal line (B S 2
) remains "Low" and proceeds to step 5T20.

Then, interrupts to the interrupt terminals (INTA) and (INTB) are enabled, and it is determined whether the 7-lag TIF is "1". If the 7-lag TIF is "1", it means that a timer interrupt has occurred during this operation, and the TIF is reset to "0" and the operation proceeds from step 5T45. On the other hand, if the 7-lag TIF is "0", the operation is stopped.

When the control microcomputer (CMC) sets the signal line (C8CA) to "Low" for data exchange, the calendar microcomputer (CAMC) outputs the interrupt terminal (INTB) from Sr15.
). Sr15 enables a timer interrupt, and then determines whether to output or input data by determining the state of the signal line (Ilo). If data is to be input, step Sr17 is used to control microcomputer (CM).
Read data from C). Then, if M/LT mode is selected and M/LT mode is not operating, set the exposure time data, and if M/LT mode is not selected or counting is in progress in M/LT mode, leave it as 5T.
Move to step 30. In step 5T30, it is determined whether the interval function has been selected and is in an operating state. And if the interval function is not selected or in operation, the gloss remains the same, 5T20
Move to the next step. On the other hand, when the interval function is selected and the operation has not started, the number of frames is stored in register IFH, the number of groups is stored in IGR, the time interval between groups (remaining time), and the start time. is set and moves to step 5T20. When it is determined at step 5T26 that data is to be output, the aforementioned data is sent to the control microcomputer (CMC) and the process moves to step 5T20.

When a timer interrupt occurs every second, the operation starts from step 5T40, and if the interrupt terminal (INTAL (INTB)) is in operation, the 7-lag TIF is set to "1'" and the previous operation is 70. -.On the other hand, if such an operation is not performed or those (INTA), (I
When the operation in step 5T45 is completed, the operation starts from step 5T45. In step 5T45, the calendar is rewritten by increments of 1 second.

Then, it is determined whether the M/LT mode is operating, and if it is, "1" is subtracted from the set seconds (Tv timer), and it is determined whether the Tv timer has reached "0".

If it is not "0", the process directly proceeds to step 5T62 (INTA).

(INTB), enables timer interrupts and stops operation. On the other hand, if the content of the Tv timer is "0" in step 5T48, the signal line (BS2) is set to "H".
igh”, the rear curtain starts running on the camera body (BD), and the process moves to step 5T62.

If it is determined in step 5T46 that the M/LT mode is not in operation, then it is determined whether or not an interval photographing operation is being performed. If it is not interval photography, the signal line (BS2) is set to "High" and the process moves to step Sr12.

This is because the operation key (8) may be operated while the M/LT mode or interval function is in operation, resulting in a non-operation (stopping of operation) state. In this case, M/LT closes the signal line (BS2) to "iHt+" to stop the interval and stops the exposure control operation of the camera.

When it is determined in step Sr15 that the interval function is selected, the process moves to step ST56, where it is determined whether it is 1 minute before the start of one group shooting, and if it is 1 minute before, the signal line (BSI) is selected. “Low”
This pulse is output to activate the camera body (BD) and start external pressure operation of the flash device (FL). In this case, the signal line (BS2) is “High”.
is output, so calculate the time until the start and ST
Proceed to step 62. On the other hand, if it is determined in step 5T56 that it is not one minute ago, it is then determined whether it is the start time of one group's shooting, and if the start time has been reached, the signal line (B S 2) is connected to Lou+. '' and moves to step 5T62. On the other hand, before or after the start, the signal line (
It is determined whether "Lou+" is being outputted to B S2), and if "Low" is being outputted, one group is in operation, so the process immediately moves to step 5T62. On the other hand, if "High" is output to the signal line (B S 2), it means that the shooting operation for interval shooting is about to start or between groups, and in this case, the remaining time until the start is calculated. The process moves to step ST62.

Next, display microcontroller (DMC), LCD segment driver (SD), LCD common driver (CD), LC
A graphic display block composed of a D drive reference power source (DD) and a liquid crystal display section (LCD) will be described. First, the control microcomputer (CMC')
Based on the transfer lock (DCKj), the data (4 bits) shown in Table 2 is transferred to the display microcontroller (DMC) via the data bus (DBUS2).
MC) is converted into data for graphic display, and then sent to the LC.
It is serially transferred to the D segment' driver (SD). LCD segment driver (SD) is R for LCD display.
It has a built-in AM, and 1 bit of data in this LCD display RAM is displayed as 1 dot on the liquid crystal display (LCD).
Supports alpha lamp off. After the graphic display data is transferred to the LCD segment driver (SD),
The LCD segment drive signal (SGT) is stored in the LCD display RAM and corresponds to the contents of the LCD display RAM.
From the LCD segment driver (SD) to the liquid crystal display section (L
CD). The LCD common driver (CD) uses a built-in oscillator to generate timing signals necessary for display, and also generates an LCD common scanning signal (CMT) that automatically scans the common signal of the liquid crystal display (LCD) according to the display duty. is output to the liquid crystal display (LCD).

LCD segment drive signal (SGT) and LCD
The common scanning signal (CMT) is transmitted by the LCD common driver (
Synchronization is achieved by a synchronization signal (H8) supplied from the LCD segment driver (SD) to the LCD segment driver (SD).
The liquid crystal display section (LCD) performs dot matrix graphic display using these two signals, namely, the LCD segment drive signal (SGT) and the LCD common scanning signal (CM T ). Reference power supply for LCD drive (DD
) supplies stable power (V DP ) to the LCD segment driver (SD) and LCD common driver (CD) to drive the liquid crystal display (LCD).

The above is how the graphic pattern is displayed on the liquid crystal display (LCD) based on the data from the control microcomputer (CMC).
The operation until the e-turn is displayed will be described in more detail below with reference to the 70-chart of the display microcomputer (DMC).

First, from the control microcomputer (CMC) to the display microcomputer (DM)
The display microcomputer (DMC) starts operating by the signal line (DEN) to C), and the supply of power is started.) The reset routine shown in FIG. 106 is started (step 2). In step ■, the LCD segment driver (SD) is initialized, and the LCD segment driver (SD) is initialized.
CD) is turned off (all lights off).

At step (2), it is determined whether or not the full lighting mode is set, and normally the system enters an interrupt standby state at step (2). This determination of whether or not it is the full lighting mode is for a disconnection test at the factory.When the full lighting mode is selected, the full lighting data is output to the LCD segment driver (SD). Turn on the LCD (LCD) and stop the system clock in step ①. If it is not the normal mode, that is, the full lighting mode, it enters the interrupt standby state in step ■.
Wait for an interrupt from the control microcomputer (CMC). The imprint routine shown in FIG. 107 is a routine for setting 7 lags for displaying an imprinting indicator ("IMF") for a certain period of time during imprinting. Start step by the imprint signal (IP) from the camera (■)
, the register is saved in step ■, and the “IM” is saved in step [phase].
After setting the "F" display flag, the registers are restored in step (2), and the main routine is returned to in step (2).

Figure 108 Main routine is performed by the control microcomputer (CMC)
The main routine is started by a signal (C8DM) from to the display microcomputer (DMC) (step ■), and the main routine is prohibited from restarting until all processing within the display microcomputer (DMC) is completed in step ■. Table 2
Input the transfer data from the control microcomputer (CMC) shown in , check the power supply voltage at step [phase],
If the power supply voltage is below a predetermined value, in step O,
Set the power supply voltage check flag (B, C, 7 lag).

In steps 2 to 0, the data transferred from the control microcomputer (CMC) is decoded into graphic display data.

This decoding is first performed on the character display section (16) (step ■), and the mode name display, INPUT
It is converted into graphic display data corresponding to the display contents such as display, OUTPUT display, etc., and this data is output to the LCD segment driver (SD) and displayed on the LCD in this LCD segment driver (SD).
The data is written to the display RAM (step ■). Subsequently, the indicator indicating the control range and the mode display section (18) are decoded in step [phase] and applied to the LCD segment driver (SD) (in step).

Next, an index (22) indicating the shutter speed value, an index (23) indicating the aperture value, and a symbol (21) indicating the execution state of each function are decoded into graphic display data (step @). In step ■, the B, C, and 7 lags determined in step [phase] are tested, and if B, C, and 7 lags are set, the battery check display (B,
C, display) is displayed (step 0).

If the B and C07 lags are not set, depending on which function is selected on the external display, the calculation corresponding to that function is performed in step (Dl), and the indicator (20) indicating this function itself is executed. In step O), these graphic display data are output to the LCD segment driver (SD) in step 0. Here, the calculation according to the function in step O will be explained in detail.

When the exposure function is selected first, in order to draw the E-sill line (25), the shutter speed values are sequentially changed and appropriate fringe values are determined for each shutter speed value. After that, exposure mode (P,,P2.P3.S,A,).

M, M/LT), set the setting line (26) to the 109th
Draw according to the steps from Figure to Figure 114. P ltP 2-P
When the S mode is selected, in FIG. 109, the minimum aperture value A vmax of the lens, the maximum aperture value Avmin of the lens, and the setting limit value Avn on the fine pattern side of the lens are shown.
, the set limit value Avm on the open aperture side of the lens, and the selected slope Avp, Tvx is determined by the procedure shown in FIG.
I will draw Avy while changing the. To explain briefly, first, in step 2, Tvx is set to -0, 5, and in step 2, a line segment 2 is drawn, and then, line segments 2 to 2 are drawn while incrementing Tvx (steps 2 to 2). Finally, a line ■ is drawn as T vx=T v+nax (step ■). P,,P2. Setting line in P3 mode, 6th
The calculation in Figure-(26) is above, but the Avp line in PI and P3 mode, Figure 109-line segment ■, has a slope of 2.
:1 and 1:2, so when drawn in the same way as in P2 mode, the slope becomes step-like and difficult to understand. Therefore, in the P and P3 modes, this number is devised so that the points (TVXI A vy) obtained by calculation are arranged in a - straight line (see Fig. 6.8). @111 Figure shows how to draw a setting line in S mode, and Tvn is the setting shutter speed. Draw a line (line segment ■) of A vy = A v + nin while incrementing Tvx in steps ■ to ■, then draw a line (line segment ■) of Tvx = Tvn, and draw a line segment ■ as T vx = T vn. Finally, while incrementing Tvx again, a line (line segment ■) of Avy=A vmax is drawn. FIG. 112 shows how to draw a setting line in A mode, and Avn is the setting aperture value. In steps ■ to ■, set Tvx = -0, 5, draw a line segment ■, and in step ■, increment Tvx, draw a line (line segment ■) of Avy = Avn, and in step ■, set Tv = Tvmax, Draw each line segment■. Figure 113 shows how to draw a setting line in M mode. In steps ■ to ■, increment Tvx, draw the line (line segment ■) of Avy = Avn, and in step ■, set Tvx = Tvn and draw A.
vy= A vmin to A vy= A vmax
Draw a line (line segment ■) up to. Here A vn, T
vn 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 steps ① to ② set Tvx = -0,5 and set s A v
Draw the line (line segment ■) from y= A vain to A vy= A vmax (#1 (D)) while incrementing Tvx in step ■. Also, in M/LT mode, The setting line can be drawn using the same procedure as in M mode.The above is exposure 7.
This is a calculation method of the graphic display section in the function.

Next, the calculations of the graphic display unit when the multi-function is selected on the external display will be described. At this time, the index from -6 to +6 (hereinafter abbreviated as ΔEvx) indicating the range from the control has already been decoded in step [phase] in FIG. 108 so that the liquid crystal display (LCD) lights up. Further, the index (22) indicating the shutter speed value and the index (23) indicating the aperture value are decoded so as to be turned off. In Table 4, the automatically controlled Ev value is Eve, and the Ev currently being measured is EV.
O. If the number of stored data is n, then the point P at which photometry is currently being performed in step ① in Fig. 115. (ΔEVO% yO) and then plot the line L0 (step ■). Point Pn(ΔEvr++
Plot ym). However, 1≦n≦8, 2≦■≦9.
This situation is shown in FIG. 115 as a 70-chart. The above is the calculation method of the graphic display section in multifunction.

Next, the calculation of the graphic display section when bracket 7 anxian a is selected on the external display will be explained. Indicator indicating the amount of deviation from proper exposure -6 to +6
As with the multifunction, step [
phase] is decoded so that the liquid crystal display (LCD) lights up.

In Table 4, the current point is ΔEvCONT, and the setting start point is ΔEvCONT.
If EvSET, then in step ■ in Figure 116, ΔE
Find v+++ax, and in step ∆Evx = ∆EvS
The line from ET to ΔEvx=ΔE vmax (LS
ET), and in step ■, ΔEvx = ΔEvCONT
The line from ΔEvx=ΔE vmax (LCON
Draw T). The above is the calculation method of the graphic display section of the bracket function.

As described above, when the calculation on the graphic display section is completed, the process proceeds to step O in FIG.
0) is decoded and outputted to the LCD segment driver (SD) in step O together with the decoding result in step 0 and the calculation result in step O. Step O-
0, tests the "IMF" flag indicating that it is being imprinted, and if set, sets "IMF" to the subcharacter.
is decoded and output to the LCD segment driver (SD).

In this way, when all the graphic display data is decoded and serially transferred to the LCD segment driver (SD), the liquid crystal display (LCD) is turned on (step @) and the display microcontroller (DMC) is activated. Processing 1 loop ends. After that, it enters the standby state for an interrupt signal (C8DM) from the control microcomputer (CMC), and when the interrupt signal (csDM) is sent again, the display microcomputer (
DMC) starts the main routine again and enters the processing for the next graphic display through the above-mentioned step (2).

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

In the buck circuit (BCKC) shown in Fig. 98, power is supplied to the current microcomputer from two 3-volt power batteries (B), and the control and display microcomputer (CMC),
(DMC) is powered by four 6-volt power batteries (A). Then, the battery check on the display microcomputer (DMC) (step [phase] in Fig. 108 is
Both power batteries (A) and (B) are checked. If the power source battery (A) fails, the symbol (A) will be displayed on the graphic display section (24) as shown in Figure 117.
) and four batteries are displayed, and when the power source battery (B) is not working, the symbol (B) and two batteries are displayed as shown in FIG. 118.

Here, P, a line with a slope in mode (Fig. 109A
To explain how to draw the shutter
The method of displaying a line with a slope of speed value: aperture value = 1:2 is (a), (b), (c) as shown in the $119 figure.
) are possible. In other words, in this embodiment, the minimum display step of the liquid crystal display (LCD) is 0.5 Ev steps in both the shutter speed direction and the aperture direction, so a point is always displayed every 0.5 Ev step of the aperture value. If it is assumed that Fig. 119 (,) or (
It can be displayed in b). The difference between FIGS. 119(a) and 119(b) is due to the way the shutter speed value and fringe value are rounded during display.

If displayed in this way, it is extremely difficult to understand the slope of shutter speed value: aperture value of 1:2 in P1 mode. Therefore, in this embodiment, as shown in FIG. 119(c), only the points for each IEv step of the aperture value are displayed,
Nothing is displayed at the opening point. This results in
The slope of the aperture value relative to the shutter speed value is clear.

In the P3 mode, the display as shown in FIG. 8 is displayed for exactly the same reason.

Next, how to draw the Ev line (25) will be explained. In this embodiment, the display range of the liquid crystal display (LCD) is determined by the shutter speed value Tv≦11. Aperture value is Av≧0
．． 5, but Tv≦-0,5 and Av≧9.5 (
Both of these are represented by the indicators "tS" and "=", so they are not accurate. Therefore, the Ev line is Tv≦−0
, 5 and Av≧9.5, it is not displayed and 11≧Tv≧0
．． Only the range of 0.5≦Av<9.5 is displayed. However, the setting line (26) is Tv≦11. Av≧0.5
Displayed within the range. By doing this, the control point, which is the intersection of the setting line (26) and the Ev line (25), is set to the shutter speed value 11≧Tv≧0. Only the accurate range of aperture value 0.5≦Av≦9.5 is displayed. A specific method of drawing the Ev line is shown in FIG. 120. In this figure, first, in step ■, T vx=O(1
5ec), and in step ■, set A vy=E
Find v-T vx. However, data No. in Evli Table 2.

This is an automatically controlled Ev value of 14 to 15 and is a value sent from the control microcomputer (CMC). 0 in step ■.
Determine whether 5≦Avy<9,5 (1,2≦F<27) and if it is within this range, it is a point) (Tvx.

Avy) is plotted in Step 2), and if it is outside the range, it is not plotted. In step ■, Tvx is incremented by IEv step, and in step ■, Tvx> Tvma
Determine x (Tv=11), and if No, return to step (2) and repeat steps (2) to (2) below. And Y
When ES, that is, Tv>Tvmax, the process proceeds to step (2) and ends. Incidentally, the step of incrementing Tvx may be 0.5 Ev steps.

In Figure 1, the control microcomputer (
BMC) is the serial input/output terminal (SOU)t(
SIN), (SCK), all remaining circuits (77sh device (FL), and E/-bar (RE
C), display section (DSP), lens circuit (LEC), AF
Circuit (AFC), back circuit (BCKC), A-D.

It exchanges data with the DA conversion circuit (ADA). Therefore, by monitoring this serial input/output terminal while the system is operating, checking the data read from the monitor, and comparing it with the operation of the camera system, you can determine whether or not the system is operating normally. Can be checked. Therefore, this series input/output terminal (SOU),
The reason why (S IN) + (SCK) comes out from the camera body (BD) is the terminal for the back circuit (BCKC) (
T I), (T 2), (T 3) and the lens circuit (
terminals (T , , ), (T , 2) for LEC).

There is (TI3). And all the terminals are the back circuit (BCKC) terminal (T 1 ) t
(T 2 ), (T 3 '), so the back circuit (B
CKC) so that a checker can be attached to the position.

Then, from the checker side, the microcomputer (BMC) outputs a LOIll'' signal whose impedance is lower than the High'' signal output to the signal line (C8B),
If you force the signal line (C3B) to "Lou+", the gate circuit (G2) will always be active, so
Data exchange with circuits other than the back circuit (BCKC) can be checked. Also, check the back circuit (BCKC) by checking the lens circuit (LEC) terminal (T l2) l (T
13) is possible to some extent.

Hisayumi F As described above, according to the present invention, in the first mode in which one piece of control data is calculated based on photometric data, for example, the axis is graduated by exposure time or aperture value and displayed on an absolute scale. This allows you to see control data at a glance. In addition, in the second mode in which multiple pieces of control data are calculated, the axis is used as a relative scale, and each deviation amount of the calculated control data with respect to the specific control data according to the photometric data is displayed, for example, in a frequency distribution. The relationship between specific control data and a plurality of calculated control data can also be understood at a glance. Furthermore, since the display mode automatically changes depending on the mode, there is no need for extra operations to switch the display.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the entire camera system to which this invention is applied, Figs. 2 and 3 are 70-charts showing the operation of the microcomputer (BMC) of the camera body (BD), Fig. #4, and Fig. 5. Figures 6 to 8 are external views of the bag (BCK).
The figures are diagrams showing display examples of the display section (2), figures 9 to 35.
The figure shows the relationship between key operation and display in exposure 7 angle, Figures 36 to 54 show the relationship between key operation and display in multi 7 angle, and Figures 55 to 68
The figure shows the relationship between key operations, photographing operations, and display in the bracket function. Figures 69 to 88 show the relationship between key operations and display in the imprint function. Figures 89 to 97 show the relationship between key operations and display in the imprint function. A diagram showing the relationship between key operations, shooting operations, and display in the interval function,
Figure 98 is a block diagram showing the entire buck circuit (BCKC), and Figures 99 to 104 are control microcomputer (CMC).
), and FIG. 105 is a flowchart showing the operation of the calendar microcomputer (CAMC) 1.
106 to 108 are flowcharts showing the operation of the display microcomputer (DMC), FIGS. 109 and 110 are diagrams showing how to display program lines in P mode, and FIGS. 111 to 114 are S, Figure 115 is a diagram showing how to display program lines in A, M, M/LT modes, and Figure 115 is a diagram showing how to display program lines in multi-function mode.
Figure 6 is a diagram showing a display method using the bracket function, Figure 117 and @i'is diagram are diagrams showing an example of display when the power supply battery is low, Figure 119 is a diagram showing an example of display at Pl-[need, FIG. 120 is a flowchart showing a method of displaying the Ev line. 6 = F U N tNo, j8: Selection means, No
, 29: Calculation means, 2. LCD: display means, DMC: display control means. Applicant: Minolta Camera Co., Ltd. -4700 (+ 75 () JLILI No. ? Figure::::・j, jyo:] I ・: 10, i,...
i:i. 1 θ5 I"?] tb7 figure f-!: 9 f!+:', amount, 4th figure 1/D figure 1II figure 712 figure 1/3 figure 1/!; figure 1/z Figure 1/'7Figure 1/,!?Figure

Claims (1)

[Claims] 1) A first exposure calculation mode in which one piece of exposure control data is calculated based on photometric data, and a plurality of exposure control data are calculated based on a plurality of photometric data or one photometric data and a plurality of predetermined data. A camera that operates in a second exposure calculation mode, comprising a selection means for selectively selecting the first and second exposure calculation modes, and a calculation means for calculating control data based on the selected exposure calculation mode. , a display means for displaying the calculated control data; when the first exposure calculation mode is selected, the calculated control data is displayed on an absolute scale, and when the second exposure calculation mode is selected, the above-mentioned as the deviation amount from the specific control data; A display device for a camera, comprising display control means for controlling a display mode of the display means according to a selected exposure calculation mode so as to display calculated control data on a relative scale.