JP2545772C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly, to a release button, a photometric unit, a unit for setting data relating to exposure control, and a computing unit for calculating data relating to exposure. Mosquito with
About Mela. [Prior art] An operation member such as a key switch for setting data relating to exposure control is provided, and a set value is set.
Operate the key switch while viewing the data displayed on the display
2. Description of the Related Art Cameras capable of setting data to be transmitted are known. Further, the operation of the circuit is started by operating this key switch, and the setting data is set.
It is known to change the data and display the setting data. By the way, in the case of such an apparatus, data calculated based on the set value and the photometric value is used.
Is not displayed unless the photometric switch is operated. However, regarding exposure control
When data is set, the photometric value and the calculated value based on the set data are also displayed immediately.
Is more desirable. [Object of the Invention] An object of the present invention is to operate a circuit when a data setting operation relating to exposure control is performed.
Starts, the data setting operation is performed, and the photometry and calculation operations are also performed.
This allows the operator to check the calculated value based on the set data without any extra operation.
To provide mela. [Constitution of the Invention] A camera according to the present invention comprises: an operation member for setting data relating to exposure control; a release button for instructing a start of a preparation operation for photographing; Exposure control data as electrical signals
Data output means for outputting, and an operation of performing a predetermined operation based on an output of the photometric means and data from the data output means.
Calculation means, and operation of the release button and the data setting operation member
Control means for starting the operation of the calculating means based on the operation of the means, the output of the photometric means and the output of the data output means. Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a camera body, 2 denotes a release button, and the release button 2 denotes a manual operation.
Pushes down to the first level and presses the metering switch S1 to instruct photometry, and pushes down to the second level
Release switch S1 for turning on the shutter and operating the shutter.
I have. Reference numeral 3 denotes a mode change switch using a slide switch, and P denotes a program mode switch.
-Mode, S: Exposure time priority aperture automatic mode, M: Manual mode, A: Aperture priority
Indicates the exposure time automatic mode. Reference numeral 4 denotes a display device, which includes a control exposure time, an aperture value,
The film sensitivity override data is displayed. 5 is an aperture value setting key, 6 is a shutter speed setting key, 7, 8 are aperture values F,
Up key and down key for changing the data speed SS. 9 is a counter display
This is a window, where the number of frames shot on the film is displayed. Reference numeral 10 denotes an ISO mode key. When the ISO mode key is pressed, the camera body
The ISO data used in 1 is displayed on the display section 4, and the up key 7 and the down key are displayed.
By -8, it becomes possible to change the ISO data. Reference numeral 11 denotes an override key, and when this key is pressed, override data is obtained.
Displayed on the display unit 4, when the up key 7 and the down key 8 are operated, the override date is displayed.
Data can be changed. Reference numeral 13 denotes a filter provided on the back cover 13 of the camera body 1.
This is the window for displaying the system information. In the camera body 1 shown in FIG. 1, as shown in FIG.
Code reading contacts 15 and 16 for reading the provided ISO data are provided.
Is provided. The contact pieces 15 and 16 are located on the outer periphery of the film container 14 as shown in FIG.
Contacting, for example, two columns and six rows of code electrodes 1 to 10 formed on the surface.
It has a plurality of contact pieces AT2 to AT6, FT8, FT9, FT10, RT11, and RT12. Each of the contact pieces AT2 to RT12 is a pillar 18 made of an insulating material and erected in the camera body 1.
Is fixed by screws or the like. As shown in FIG. 3, when the back cover 33 of the camera is closed,
A back cover open / close detection switch 31 that is turned off and turned on when opened, and a film counter 34
A counter switch 34 is provided in conjunction with the counter switch 34. The counter switch 34
The film is opened and closed by a lever 36 operated by the
It is on between S and 1, and off if more than one. FIG. 4 is a block diagram of the entire camera system to which the present invention is applied. (P
In O1), the power supply battery (BAB) was installed, and the power supply was restarted from the power supply line (VC).
Power-on reset which outputs power-on reset signal from terminal (PR1)
Circuit. (MCB) is a micro computer (hereinafter referred to as) that controls the operation of the entire camera system.
This is shown in the microcontroller below). The operation of this microcomputer (MCB) is shown in FIGS.
This is shown in the flowcharts of FIGS. 9, 10 and 11. (S1) is a photometric switch.
The shutter button is closed at the first stage of pressing the release button 2. (ISS) is ISO mode
-Closed by pressing (10), (ORS) is closed by pressing the override key (11).
Switch. (FSS) is set by the aperture value setting key (5), and (SSS) is used for exposure.
These switches are closed by pressing the intermediate key (6). (UPS) is up key
(7) and (DOS) are switches which are respectively closed by pressing down key (8).
These switches are connected to the output terminals (O2), (O3) and (O4) of the microcomputer (MCB) and the input terminals (
The key matrix is composed of (i1), (i2) and (i3), and the closed switch is
It is determined by the controller (MCB). In this microcomputer (MCB), when the operation is stopped, the terminals (O2), (O3) and (O4)
h ”, and the line connected to the input terminal (i1) is an AND circuit (AN1)
The signal is input to an interrupt terminal (itA) via a circuit (OR1) and an AND circuit (AN3). Follow
And a photometric switch (S1), an ISO switch (ISS) or an override switch (
(ORS) is closed, the terminal (itA) is interrupted and the microcomputer (MCB) is started.
It is. (BMS) is a main switch, and the main switch (BMS) is opened.
Then, the output of the inverter (IN2) becomes "Low", the microcomputer (MCB) is stopped, the AND circuit (AN3) is disabled, and the terminal (itA) is interrupted.
No signal is input and the microcomputer (MCB) is not started. In addition, power supply battery (BAB)
Is removed, and power is not supplied from the line (VC).
(AN3) is disabled, and no interrupt is performed. Therefore, the power battery (BAB)
Is not installed or the main switch (BMS) is open,
(MCB) remains in the operation stop state. The switch (S2) is a switch that is closed at the second stage of pressing the release button (2).
is there. When the release button switch (S2) is closed, the inverter (IN3) is turned off.
The output becomes “High”, and the AND circuit (AN2), the OR circuit (OR1), and the AND circuit (A
An interrupt signal is input to the terminal (itA) via N3). When this interrupt signal is input,
Immediately after the shutter charge is completed and the calculation of exposure control data is completed.
Then, the operation shifts to the exposure control operation. The interrupt by the release button switch (S2) is
While the microcomputer (MCB) is exchanging data with other circuits, the OR circuit (
OR3) becomes "High", and the AND circuit (AN2) is disabled.
Therefore, no interrupt is performed. The switch (RCS) is closed when the camera back cover (3) is opened as shown in FIG.
A back cover switch that is opened when closed. Therefore, the back cover is closed
Then, the output of the inverter (IN4) becomes "High" and the one-shot circuit (OS1)
Output a pulse, the flip-flop (RF1) is set, and the terminal (itB)
The interrupt signal is input to. The microcomputer (MCB) performs the operation when the back cover is closed,
When this operation is completed, a pulse is output from the terminal (O18) and the flip-flop (R
F1) is reset and the operation is stopped. (LE) is an interchangeable lens, which is connected to the camera body via connectors (CNF) and (CNB1).
Aperture value, etc., which is electrically connected to and fixedly stored in the circuit (LEC) in the lens
Is serially connected to a microcomputer (MCB) via an interface circuit (BOL).
Is read. In this operation, the microcomputer (MCB) sets the terminal (O5) to "High" and
When an I / O command is executed, eight clock signals are output from the serial clock pulse terminal (SCP).
Is output. Then, in synchronization with this clock pulse, the lens (LE)
Data is input in a row, and this data is read from the serial input terminal (SIN).
Go. By repeating this serial input command a plurality of times, necessary data from the lens (LE) can be obtained.
Read all. (CAD) outputs the data of the code pattern provided on the film container (14).
(EM) outputs data corresponding to the set exposure control mode.
(SFC) is closed and photographed while the film counter is in the pre-winding position.
A counter switch (corresponding to FIG. 32) that opens when the shadow position is reached. (BUB) is a backup battery, and (CIM) is a storage and storage of ISO data.
Reading data (CAD) from film containers, mode data and film count
This is a circuit that reads signals from the data switch (SFC).
It is shown in This circuit (CIM) is a diode from the backup battery (BUB).
(D21) and a diode (D2) from the main battery (BAB).
0). (BCC) is the output voltage of the backup battery (BUB)
Is a circuit for checking whether the power supply line (VB) is connected via the transistor (BT0).
If the output from the backup battery (BUB) is equal to or greater than a predetermined value
A "High" signal is output to the child (i20). (PO5) is a backup battery (BUB)
This is a power-on reset circuit that outputs a reset signal when
The reset signal from (PO5) is stored in the ISO data storage register in the circuit (CIM).
Is sent only when the backup battery (BUB) is installed.
Reset only when Terminals (O30), (O31) and (O32) are the operation modes of the circuit (CIM).
This terminal is used to control the operation of the circuit (CIM) according to the output of this terminal.
Will be The OR circuit (OR50) connects these terminals (O30), (O31) and (O32) to the input terminals.
The output terminal is connected to the input terminal of the OR circuit (OR3) as a child. Therefore,
If data is exchanged between the circuit (CIM) and the microcomputer (MCB),
Interruption to the terminal (itA) by the release switch (S2) is prohibited. In FIG. 5, (SDI) is input in series from the terminal (SOU) of the microcomputer (MCB).
This circuit reads the incoming data in synchronization with the clock pulse from the terminal (SCP).
The counter (LPC) which operates when the terminal (O30) becomes "High" has the terminal (O30) at "High".
igh ”, counts clock pulses for synchronization and counts eight clock pulses.
Then, a latch pulse is output. This latch pulse is sent to the register (LAC)
When this pulse is input, the data from the reading circuit (SDI) is latched. Regis
(LAC) is reset by a pulse from the power-on reset circuit (PO5) in FIG.
Is set. (DSC) is a data selector which is an input section if the output of terminals (O31) and (O32) is "01".
ISO data stored in the register (LAC) from (α1), if “10”, enter
Data on the film container from the force unit (α2), if “11”, the mode from the input unit (α3)
And the signals of the film counter switch are output. In addition, terminals (O31), (
If the output of O32) is "00", the data selector (DSC) does not output data. straight
The column data output circuit (SDO) outputs data when the output of the OR circuit (OR52) becomes "High".
The data from the data selector (DSC) is sequentially serialized based on the synchronization clock pulse.
Output to terminal (SIN). The configuration of (CAD) and (EM) in FIG. 4 is shown in FIG. I have. , Is a conductive part of any film container,
In this embodiment, the grounded electrode (COT) contacts. Is a film
A conductive or non-conductive pattern according to the data corresponding to the ISO sensitivity of the film in the container (14).
A turn is provided, an example of which is shown in Table 1. The contact pieces (AT2) to (AT6) come into contact with the portions indicated by
An input terminal (DSC) of the data selector (DSC) of FIG. 5 via an up resistor and an inverter.
α2). The part of ~ ○○ 10 ▼ is stored in this film container (14)
A code pattern corresponding to the data of the number of photographed frames of the film (60) is provided.
ing. The contact pieces (FT8), (FT9), and (FT10) are in contact with this part.
In this embodiment, since this data is not used, the data from the contact pieces (FT8), (FT9) and (FT10) are not used.
No data is entered anywhere. It is shown in FIG. Is an input terminal (α2) of a data selector (DSC) through a pull-up resistor and an inverter.
). (MT1), (MT2) and (CMT) are data output code boards for the exposure calculation mode.
A sliding member (VT) is provided on the code plates (MT1), (MT2), and (CMT) by the mode selector switch 3.
Move according to the mode setting by. If the sliding member (VT) is at the position (P),
In the gram mode, if the data "00" is at the position (S), the exposure time priority mode
If the data of "01" is located at the position (A) in the following (hereinafter referred to as S mode), the aperture priority mode
If the data of "10" is in the position of (M) in the mode (hereinafter referred to as A mode),
In mode, data "11" is input to the input terminal (α2) of the data selector (DSC).
You. In addition, the film counter switch (SFC) is connected via an inverter (IN5).
The input signal is also input to the input terminal (α2) of the data selector (DSC). Referring again to FIG. 4, (FL) is a flash light emitting device, in which a power supply is provided.
Battery (BAF), light emission and control circuit (FLC), and main switch (FMS)
You. The flash unit (FL) is provided with a connector (CNF)
When the device (FL) is mounted on the camera body, it is electrically connected to the connector (CNB2),
Operations such as transmission and reception of data and control of the light emission amount are performed with the control circuit (FCC). (LMC) is a photometric circuit, and this photometric circuit is connected to the analog input terminal (ANI) of the microcomputer.
The photometric output of the optical circuit (LMC) is input, and the reference potential for DA conversion is applied to the terminal (VR).
I). A display circuit (DPC) is a liquid crystal display (LD) for displaying data.
P) and a flash light emitting diode (FLD) for display for flash photography. For display
Circuit (DPC) is output from terminal (SOU) while terminal (O10) is "High"
Data is taken in, and a display based on this data is performed. The details of this display section
This will be described later with reference to FIG. (RLC) is a release circuit, which is connected to the terminal (O12).
The lock of the exposure control mechanism is released based on the pulse. (APC) is an aperture control circuit, and the aperture control circuit (APC) has a terminal (O13)
Read the data of the number of steps down from the terminal (SOU) during "High"
If the actual number of steps corresponds to the read data, the aperture of the camera is reduced.
Stop the retraction and determine the aperture. (TIC) is an exposure time control circuit,
Exposure time control data output from terminal (SOU) while terminal (O14) is "High"
To the data read from the time when the count switch (S3) is closed.
After a lapse of a corresponding time, the shutter closing operation is started. In addition, the terminal (TIE)
When the release signal (RLS) is output, it becomes "High" and the shutter closing operation starts.
After a predetermined time (for example, 50 msec) has elapsed, the state becomes “Low”. Next, the operation of this system will be described with reference to the flowchart of FIG.
When power supply from the terminal (VC) starts, power supply to the microcomputer (MCB) starts and
(MCB) performs an initial reset operation. Also power-on reset
The signal (PR1) resets the flip-flop (RF1).
The display circuit (DPC) supplied from the child (VC) is also reset. First, in the step # 0, the microcomputer (MCB) sets the terminals (O1) to (O4) to "High".
And the terminals (O5) to (O18) are set to "Low". Furthermore, the terminal (O31) is set to “High”,
When the terminals (O30) and (O32) are set to "Low", the vibration due to the battery
Wait for a certain period of time necessary for the contact of the film container to stabilize
Force operation. Then, via the circuit (CIM), the filter from the detection unit (CAD) is
The data on the memory container is read into the register IOR, and this data is stored in the register CAR.
Is set to Table 4 shows how to set data in the register CAR. Next, the terminal (O32) is set to "High" to perform a serial input / output operation, and the register (LA
Read the ISO data stored in C). This read data is registered
Set to MER. Next, the terminal (O31) is also set to "High" to make the mode data and
And read the data from the switch MOR, and set the data in the register MOR. So
Next, it is determined whether or not the input terminal (i20) is “High”.
The output voltage of the backup battery (BUB) is sufficient, and then the register (LAC)
It is determined whether the data read from is normal. This determination means that all bits
If it is not "0", it may be determined that it is normal. And back
If the backup battery (BUB) is normal and the data from the register (LAC) is normal,
The data (MER) read from the register (LAC) is set in the register SVR, and #
Go to step 3. In step # 1, the output voltage of the backup battery (BUB) falls below a predetermined value.
Or normal data is read from the register (LAC) in step # 2.
If not, the process proceeds to step # 4. In step # 4,
The contents of the register CAR are checked whether data from the room container has been read.
If it is read, it is based on the data from the film container.
Is set in the register SVR, and if not read, the fixed data
Data Svn (for example, ISO100Sv = 5) is set in the register SVR. Next, the cash register
Set the contents of the star SVR to the I / O register IOR and set the terminal (O30) to "High"
To perform a serial input / output operation, whereby the contents of the register SVR are stored in the storage register.
Sent to the master (LAC). Next, when fixed data is set, bits MDR0 and
MDR7 is set to "1", and the remaining bits are set to "0". Register here
MDR is a register in which data indicating a display mode is set.
Is as follows. Bit MDR0 indicates both the ISO symbol and the SS symbol.
When there is no symbol, it is "0", and when displaying the symbol of ISO or SS, it is "1". MDR1 indicates "1" when displaying the exposure time on the display section, and displays ISO data.
When it is, it becomes "0". MDR2 and MDR3 are used to display the override data when displaying the override data.
Is "01" on the + side, "10" on the one side, and the override data is 0.
-"11" when displaying the override data, not displaying the override data
The time is "00". Therefore, if MDR2,3 is "00",
No indication about the id is made, and if "01", the symbol of the override "+/-
"+" Is displayed before "" and override data, and if "10", the symbol "+ /
"-" Is displayed before "-" and override data, and if "11", the symbol "+ /
"-" Is displayed, and at this time, 0 is displayed for the override data.
Neither "+" nor "-" is displayed before the data. The symbol "+/-" indicates exposure.
Even when the control value is displayed, if MDR2,3 is "01", "10"
Is displayed. MDR4 is "1" when displaying the F value, and "0" when not displaying the F value.
Therefore, when "1", "F" is displayed, and when "0", "F" is displayed.
Not done. MDR5 and MDR6 are light-emitting diodes for displaying the status of the flash device (
A signal indicating the display mode of FLD) is set. When “00” is set,
Is not attached to the camera body (FLD) is off. “01”
This indicates that the power supply state has been set when the device is mounted, and blinks at 2 Hz. “10”
Indicates that the flash device is fully charged,
The mode (FLD) lights up, and when it is "11", it indicates the dimming completion state.
The mode (FLD) flashes at 8 Hz. When MDR7 is "1", the whole liquid crystal display
It blinks at 2Hz and lights up when it is "0". Next, the contents of register SVR, data BLD for blank display, and register MD
The contents of R are sent to the display unit (DPC) and the terminals (O2) and (O4) are set to "Low" and the terminal (it)
A) Wait for 10 seconds, enabling interrupts to (itB). Therefore, the microcomputer (MCB)
Powered by backup battery (BUB) when power supply battery (BAB) is installed
Of the stored memory circuit (LAC) is lost or the backup battery (B
UB) output is not normal and ISO data based on the data on the film container
10 seconds when data is not read and fixed ISO data is set
During this time, this data is displayed blinking, and a warning is issued. Further film counter
It is determined from the bit 2 of the register MOR that the switch (CFS) is open.
Then, the terminals (O2) and (O4) are set to "Low". Therefore, the ISO switch (ISS) is closed.
Since the interrupt signal is input to the terminal (itA) only when the
However, the exposure control operation is not started, and the shutter is in the release lock state. This state
To get out of the state, operate the ISO switch or wait 10 seconds. Also,
If it is determined that the film counter switch (CFS) is closed,
It is unlikely that the film is mounted and wait 10 seconds without releasing lock. After 10 seconds have elapsed, the terminals (O2) and (O4) are set to "High" and the step # 3 is performed.
And sends the data for lighting and displaying the ISO data to the display unit (DPC).
, "HALT" state. Normal ISO data is output from the register (LAC).
When it is read, this data is set, and the process immediately proceeds to the step # 3 where I
The lighting display of SO 2 is performed. Even if the register (LAC) is not normal,
When normal data is read from the device, the ISO is lit and the release lock is displayed.
It doesn't cost. FIG. 8 shows the operation when the back cover is closed and an interrupt signal is input to the terminal (itB).
doing. First, wait for a fixed time (for example, 0.5 sec) to elapse after the back cover is closed.
wait. This is because the film container is vibrating immediately after the back cover is closed,
This is because the contact between the container (14) and the contacts (15) and (16) is not stable. Next, the terminal (
O2), (O3) and (O4) are "High", and terminals (O1), (O5) to (O18), (O30) and (O32) are
The terminal (O31) is set to "High" and the serial input / output operation is performed.
. As a result, data from the film container is read. Then read
Based on the data obtained, it is determined whether or not data is provided on the film container.
It is determined, and if provided, the ISO data based on this data is stored in the register SV.
R, and if no data is provided on the film container, the register SVR
Leave the content as before. Next, the bit MDR0 is set to "1", and the remaining bits MDR1 to MDR7 are set to "0".
Display contents of register SVR, blank data BLD, and contents of register MDR
(DPC) to display the set ISO data. And the terminal (O18)
Generates a pulse and resets the flip-flop (RF1), and the terminals (itA) and (itB)
) Is enabled and waits for 5 seconds. When 5 seconds elapse, is step # 3 in FIG.
The display is turned off in the same manner as the above operation, and the state becomes the "HALT" state. Here, a specific example of the determination with (CAR) of # 4 and # 8 will be described with reference to FIG.
As shown in Table 1, if it is a film container provided with a code pattern, or
At least one of the parts is necessarily a conductive part. Therefore, register C
If “1” is read into either of the AR bits CAR4 or CAR3,
-Data from the code pattern is assumed to be attached to the container provided with the pattern.
-Data setting is performed. On the other hand, if both bits are "0", a code pattern is provided.
If no film container is installed or no film container is installed
At this time, no data is set based on the contents of the register CAR. Next, based on FIG. 10, the film sensitivities of steps # 7 and # 10 are set.
A specific example of the operation will be described. First, 16 bits are stored in the register SVR. _H ( _H Is a hexadecimal number
Is set). Here, the registers SVR1 and SVR2 are 8 bits, and each bit is 1 bit from the upper bit.
6, 8, 4, 2, 1, 1/2, 1/4, and 1/8 are weighted. And Huy
Lum sensitivity changes in 1/3 Ev units in the apex value. Therefore,
If the fractional part of the sensitivity of the film set in the camera is 1/3, it is 1/4, and if it is 2/3, it is 3/4.
(= 1/4 + 1/2). Therefore, the value set in the register SVR1 in the step # 1 is set.
16 _H Is equivalent to Sv = 2 · (2/3). Next, first, if the bits CAR4 and CAR5 of the register CAR are "11", "0" is set.
8 _H ”,“ 10 ”for“ 04 ” _H ”,“ 01 ”is“ 02 ” _H "In the register SVR1
Add to the contents of Therefore, if the bit of the decimal part is “11”, Sv = 1 is added and “
1E _H And the decimal part is 3/4. If the bit of the decimal part is "10", Sv = 1/2
And add “1A _H ”To make the decimal part 1/4. If the bit of the decimal part is“ 01 ”, Sv =
Add 1/4 to “18 _H To set the decimal part to 0. Next, if the bit CAR2 of the register CAR is 1, Sv = 4, and if the CAR1 is 1, Sv = 4.
= 2, if CAR0 is 1, Sv = 1 is added to the contents of register SVR1. The above operation
The following describes an example in which a film container of ISO 400 is mounted on a camera.
You. In this case, as shown in Table 1, the portion indicated by, is a conducting portion. And
In the register CAR, the bits CAR3 and CAR2 are “1”, and the bits CAR4, CAR1 and C
AR0 is "0". Therefore, 22 is stored in the register SVR1. _H Is added
38 _H become. This data is 4 + 2 + 1 = 7 according to the definition of the weight of each bit.
Thus, the apex value Sv = 7 in ISO400. Next, the operation of FIG. 4 based on the flowcharts of FIGS. 11-1, 2, 3, and 4 will be described.
I do. With the main switch (BMS) closed and the power supply battery (BAB)
Is on, the photometering switch (S1), ISO switch (ISS), and override switch
Switch (ORS) is closed via the AND circuit (AN3) when the terminal (itA) is closed.
And the operation from the step # 11 is started. First, the flag CC
It is determined whether the content of F is "1". This flag CCF is data for exposure control.
Is “1” when is calculated, and is “0” when not calculated.
You. Operation when an interrupt signal is input to the terminal (itA) with the exposure control value calculated
Will be described later. When the flag CCF is "0", the terminal (O1) is set to "High" next. By this
As a result, the transistor (BT0) becomes conductive, and power supply starts from the line (VB). further
And the AND circuit (AN1) is disabled, and the AND circuit (AN2) is activated.
The signal from the release switch (S2) can be input to the terminal (itA) as an interrupt signal.
Becomes Next, by setting the terminals (O3) and (O4) to "Low", only the terminal (O2) is set to "High".
To determine whether the terminal (i1) is at "High". The terminal (i1) is at "High".
If so, the photometry switch (S1) is closed, indicating that an interrupt has been made.
The lug LMF is set to "1" and the terminal (O2) is set to "Low". Switch (SI) is open
If the terminal (i1) is determined to be "Low" in step # 13,
Next, only (O3) is set to "High", and it is determined whether or not the terminal (i1) is "High". This
If "High" at the time of, the interrupt was performed by the ISO switch (ISS)
If the flag ISF is set to "1" and the terminal (i1) is "Low", the flag ISF is overridden.
This is a case where an interrupt is performed by a switch (ORS), and the flag ORF is set to “1”.
To Then, the terminal (O3) is set to "Low", and the process proceeds to step # 14. In the step # 14, the terminal (O5) is set to "High". And serial input / output operation
The data from the lens (LE) is read by performing the
These data are sequentially set in a plurality of registers LDR. When this operation is completed,
(O5) is set to "Low", and the terminals (O31) and (O32) are set to "High". After this action
, Perform a serial input / output operation, and receive a mode signal applied from the code board EM and a counter.
The signal from the switch (SFC) is read and set in the register MOR, and the terminal (O3
1), (O32) is set to "Low". The mode data is stored in bits MOR0 and MOR1.
, The signal of the counter switch (SFC) is set to MOR2. This is the film
The state of the counter and the signal of the exposure control mode are taken into the register MOR.
become. Next, the terminal (O9) is set to “High” and a pulse of 50 μsec width is output from the terminal (O8).
I do. After setting the data of “00H” in the input / output register IOR,
Perform column input / output operation. Then, the register IOR from the flash device (FL)
Is fetched, and this data is set in the register FDR. And the terminal (
O9) is set to "Low", and the routine proceeds to step # 15. In step # 15, the photometric result of the subject obtained from the photometric circuit (LMC) is displayed.
A / D conversion of the output, and then the open aperture value included in the A / D converted data
Avo, the term of the open metering error Avc is removed based on the data from the lens (LE).
For this purpose, the data of (Bv-Avo-Avc) + Avo + Avc = Bv is calculated to calculate the data of the object luminance. Then, the calculation of Bv + (SVR) = Ev is performed to calculate the exposure value Ev. Next, it is determined whether the contents of the bits MDR2 and MDR3 of the register MDR are "01".
Separately, if “01”, as described above, the override is on the + side, and the override on the + side is
The content of the register ORR1 in which the data is set is subtracted from the exposure value Ev to obtain Ev.
Calculate the value. If the contents of MDR2,3 are not "01", then it is determined whether it is "10"
It is determined that if "10", the override of one side is being performed,
The contents of the register ORR2 in which the override data is set are added to the exposure value Ev
To calculate the Ev value. When the above operation is completed, the process proceeds to the step # 16, and thereafter, the exposure control data is obtained.
The data is calculated. In step # 16, it is determined whether the mode is the P mode or not.
In the case of the negative mode, the calculation for the steady light photographing and the calculation for the flash light photographing in the P mode are performed.
No, the flag DCF1 is set to "0", and the routine proceeds to step # 18. Here
The lag DCF1 is "1" when the set aperture value or the set exposure time is changed.
This flag is set to "0" when there is no further change.
Since no change is accepted, the flag DCF1 becomes "0". If it is determined in step # 16 that the mode is not the P mode, the process proceeds to step # 19 to determine whether the mode is the A mode. If the mode is A, change the aperture value
Therefore, this data change operation is performed first. First, set the terminal (O2) to “High”
Then, it is determined whether or not the terminal (i2) is “High”. Aperture if terminal (i2) is "High"
The setting switch (FSS) will be closed. Then, the terminal (i3) is set to “Hig
h ", and if" High ", the up switch (UPS) is closed.
Will be. In this case, the terminal (O2) is set to "Low" to change the data toward the small aperture side.
Perform a further operation. That is, the contents of the register AVR3 in which the set aperture value data is set are
Open aperture value data Avo from the lens (LE) (this data is sent from the lens ROM
First, it is determined whether or not it is on the open side. And open aperture
If the data is on the open side of the reset value Avo (this is
), The contents of register AVR3 are set to Avo, and the routine proceeds to step # 20.
I do. If the contents of register AVR3 are not on the open side than Avo, then it is equal to Avo
It is determined whether or not the data dAv from the lens (LE) are equal if they are equal.
If not, add 1/2 to the contents of register AVR3 to make the contents of register AVR3
Whether the value is larger than the maximum aperture data Avm from the lens (LE)
And if it is larger, the maximum aperture value Avm is set in the register AVR3 and # 20 is set.
If not, the process directly proceeds to the step # 20. Most
Large aperture value data Avm is also sent from the lens ROM. Here, the data dAv will be described. There are various aperture values for interchangeable lenses.
Some units are in 0.5 Ev units (Avo = 0.5, 1.0, 1.5, 2.0 ...).
In some cases, the unit is not 0.5 Ev units (for example, F2.5 (Av = 2.64), F3
.5 (Av = 3.61), F1.8 (Av = 1.7), etc.). By the way, set on the camera side
The aperture values are in a series of 0.5 Ev units except for the open aperture value. So open
If the aperture is not set to 0.5 Ev, the aperture from the open aperture to the next set aperture is 0.5.
It changes by a value dAv smaller than Ev and becomes a value of 0.5 Ev unit, and thereafter, it is 0.5 Ev.
It gradually changes to the smaller aperture side. Therefore, for a lens of F2.5, dAv = 0.36, F
DAv = 0.39 for a 3.5 lens and dAv = 0.3 for an F1.8 lens.
You. This data dAv is also sent from the ROM of the lens. When the terminal (O2) is at the “High” timing, the terminal (i3) is
Switch (UPS) is not closed, the terminal (O2) is set to "Low",
Only the terminal (O3) is set to “High” and the down switch (DOS) is switched from the state of the terminal (i3).
Determine if it is closed. Down switch (DOS) is closed
Is determined, the terminal (O3) is set to "Low", and the content of the register AVR3 is reduced by 1/2.
Is subtracted, and it is determined whether or not the result of the subtraction is on the open side from the open aperture value Avo.
Determine. If the value is on the open side, set the open aperture value Avo in the register AVR3
Then, the process proceeds to step # 20. In step # 20, it is determined that the setting data has been changed in the flag DCF1.
To indicate this, "1" is set, and the routine proceeds to step # 21. Meanwhile, aperture switch
(FSS) is not closed, up switch (UPS), down switch
When both (DOS) are not closed, the data is not changed and the step
At step # 23, the flag DCF1 is set to "0", and the routine proceeds to step # 21. #
In the step 21, the calculation for the constant light photographing in the A mode is performed, and then the processing in the step # 22 is performed.
After performing the calculation for flash light photographing in the A mode in the step, step # 24
Move to If it is determined in step # 19 that the mode is not the A mode, then in step # 25 the mode is switched to the S mode.
Determine if When it is determined that the exposure mode is the S mode, the exposure time switch (SSS) is closed from the state of the terminal (i2) in steps # 25 and # 26.
Determine whether or not. And the exposure time switch (SSS) is not closed
Is determined, the flag DCF1 is set to "0" at step # 28,
Move to step. On the other hand, the exposure time switch (SSS) must be closed.
If it is determined in # 27, whether the up switch (UPS) is closed next
Is determined. Then, the fact that the up switch (UPS) is closed indicates that
If it is determined in the step, the set exposure time data is set in the register TVR3.
Add 1 to the volume. Whether this addition result is larger than the data Tvm of the shortest exposure time
In step # 31, if it is larger, Tvm is set in the register TVR3.
If not, the flag DCF1 is set in step # 32.
"1" is set, and the routine proceeds to step # 29. It is determined in step # 30 that the up switch (UPS) is not closed.
Then, it is determined whether the down switch (DOS) is closed in step # 3.
The determination is made in step 3. If the down switch (DOS) is closed, step #
At 34, 1 is subtracted from the contents of the register TVR3, and the result of the subtraction is the longest exposure time.
Determine whether the value is longer than Tvo, and if it is longer, Tvo
It is set in the register TVR3, and if it is not a long time, it is left as it is, and the flag DCF is set.
"1" is set to 1 and the process proceeds to step # 29. When the exposure time switch (SSS) is not closed or is closed
Unless both the up switch (UPS) and down switch (DOS) are closed
The flag DCF1 is set to "0", and the routine proceeds to step # 29. # 29
In the step, the calculation for the steady light photographing in the S mode is performed, and then the flash in the S mode is performed.
After performing a shooting calculation, the process proceeds to step # 18. If it is determined in step # 25 that the mode is not the S mode, the mode is the M mode.
In this case, it is possible to change both the aperture value data and the exposure time data.
The aperture value and the exposure time are changed in the same manner as described above, and the calculation for the steady light photography in the M mode is performed.
, Calculation for flash light photographing in M mode is performed, and the routine proceeds to step # 18.
. In step # 18, the calculation of the exposure control data has been completed, so that it is possible to shift to the exposure control operation, and the flag CCF is set to "1". And terminal (itA)
, (ItB) by an interrupt signal. Next, the flash device (F
L) whether a flash device that is supplying power based on the data from
If there is no mounting signal, the bits MDR5 and MDR6 of the register MDR are set to “
00 ”and proceeds to the step # 35. If there is a mounting signal, then the dimming operation is completed.
Signal (hereinafter referred to as FDC signal) is input, and the FDC signal is input.
Is set, "11" is set in bits MDR5 and MDR6 of the register MDR and # 35 is set.
Move to step. On the other hand, if the FDC signal is not input, the next charge completion signal
It is determined whether or not it is input, and if the charge completion signal is input, MDR5,
"6" is set to "10", and if not input, "01" is set. In the step # 35, set the terminal (O9) to “High” and flash from the camera below.
Data is transferred to the device (FL). In step # 36, a 100 μsec
Output to the terminal (O8). Next, the ISO data set in the register SVR is set.
Data is set in the input / output register IOR, and the contents are further transmitted through the DA converter.
From the analog signal output terminal (ANO). Then perform serial input / output operation
Thus, the ISO data is sent to the flash device. Subsequently, the register AVR2 in which the aperture value data for flash photography is set is stored.
The contents are set in the register IOR and sent to the flash device, and the flash exposure
The contents of the register TVR2 in which the time data is set are set in the register IOR.
To the flash device. Next, of the data from the lens (LE), the focal length
The contents of the register LDRf in which data is set are set in the register IOR, and
The signal is sent to the lash device and the terminal (O9) is set to "Low". The above is the flash device
This is a data transfer operation. On the basis of these data, the flash device is
It performs operations such as display and automatic setting of the irradiation angle. Next, in step # 40, it is determined whether or not the flag ISF is "1". And
If "1", it means that the ISO switch is closed, and the process proceeds to step # 43.
Run. On the other hand, if “0”, whether the flag ORF is “1” in step # 41
Is determined. If "1", the override switch (ORS) is closed.
The process proceeds to step # 44. On the other hand, in the case of "0", the register MOR
The content of the bit MOR2 is determined, and if "0", the film counter switch (SF
(C) is closed and the film counter reaches 1 (the position of the film piece that can be photographed)
, And the process proceeds to step # 52. In step # 42,
When the bit MOR2 of the register MOR is "1", the film counter switch (
(SFC) is determined to be open, in this case, to step # 46.
Since the mode is for displaying the exposure control value, if bits MDR2 and MDR3 are "11", "0" is set.
0 ", and MDR1 and MDR4 to" 1 ".
If not, the symbols +/- are not displayed, and the symbols F and SS are displayed on the display device.
Displayed on LDP. Next, it is determined whether or not a charge completion signal is input, and the charge completion signal is
For flash photography, if input from the flash device (FL) to the microcomputer (MCB)
The display unit displays the exposure time (contents of the register TVR2) and the aperture value (contents of the register AVR2).
(DPC) in series, and if no charge completion signal is input, the exposure for
Display time (contents of register TVR1) and aperture value (contents of register AVR1) are displayed on the display unit (
DPC) in series, and proceeds to the step # 49 in FIG. 11-4. In step # 40, it is determined that the ISO switch (ISS) is closed.
Then, the process proceeds to step # 43. When the process proceeds to the step # 43, only the terminal (O2) is set to “High”, and the step #
At 50, it is determined whether the up switch (UPS) is closed. And up switch
Switch (UPS) is closed, then the IS manually set in step # 51
It is determined whether the decimal part of the O data is 1/4. And if it is 1/4, it must be 1/2, 1/4
Then, the data obtained by adding 1/4 is set in the register SVR2. Therefore, the decimal part is 0
If it is 1/4, it becomes 3/4 if it is 1/4, and it becomes 0 if it is 3/4. That is, as described above, 1/3 = 1/4, 2/3
= 3/4 and 0 = 0. The contents of the register SVR2 are the maximum ISO data.
It is determined whether it is larger than Svm, and if larger than Svm, Svm is set to the register SV.
R2 is set, and if it is not large, it is left as it is, and the process proceeds to step # 52. If it is determined in step # 50 that the up switch (UPS) is not closed, the process proceeds to steps # 53 and # 54, where only the terminal (O3) is set to "High", and # 55 is set.
It is determined whether or not the down switch (DOS) is closed. And down
When the switch (DOS) is closed, the decimal part of the data set manually is 3/4.
If it is, subtract 1/2, and if it is not 3/4, subtract 1/4. That is, if it is 3/4, it becomes 1/4, and if it is 1/4,
If it is 0, it will be 3/4. Then, the content of the register SVR is the minimum ISO data Sv
It is determined whether it is smaller than o, and if it is smaller, Svo is set to SVR2 and smaller.
If not, the process proceeds to step # 52. Further, it is determined that the down switch (DOS) is not closed in step # 55.
If separated, the process proceeds to the step # 52 while keeping the contents of the register SVR.
You. In the step # 52, the flag DCF2 is set to "1", and the bit MDR0 is set to "1".
And the bits MDR1, MDR4, and MDR7 are set to "0", and the contents of the register SVR are changed to "0".
The register (IOR) is set, the terminal (O30) is set to “High”, and serial input / output operation is performed.
Let me know. As a result, the newly set ISO data is stored in the circuit (CIM).
Is fixedly stored in a register (LAC) (FIG. 5). Next, ISO data and aperture value
Data for turning off the display unit is sent to the display circuit (DPC), and the process proceeds to step # 49.
I do. At the step # 41, the flag ORF is "1" and the override switch (
(ORS) is closed, the flow proceeds to step # 44. Immediately
First, in step # 57, it is determined whether the up switch (UPS) is closed.
If the up switch (UPS) is closed, MDR2 and MDR3 are set to "0".
1 "and add 1/2 to the contents of the register ORR1.
It is determined whether or not the contents of the register ORR1 have been exceeded.
Set it to the register ORR1, and if it does not exceed it, leave the flag in step # 58.
The DCF is set to “1” and the process proceeds to step # 60. In step # 57, it is determined that the up switch (UPS) is not closed.
Then, the process proceeds to step # 61, where only the terminal (O3) is set to "High", and
It is determined whether the switch (DOS) is closed. And down sui
Switch (DOS) is closed, add 1/2 to the contents of register ORR2 and
If ODm is exceeded, ODm is set in the register ORR2.
Then, "1" is set to the flag DCF2, and the routine proceeds to step # 60. If the down switch (DOS) is not closed in step # 62, the MD
R2, MDR3 and registers ORR1, 2 are left as they are, and flag DCF2 is set to "1".
Then, the flow shifts to the step # 60 in FIG. 11-4. In the step # 60, the bits MDR2 and MDR3 of the register MDR are "00".
Then, if it is "00", it is set to "11" for display. And MD
R0, MDR1, MDR4 and MDR7 are set to "0". Therefore, in this case,
Then, only the override +/- symbols are displayed. Next, the blank data (BLD) is output to the register (IOR), and the display unit (
DPC) so that the numerical display of ISO or SS is turned off.
If the contents of DR2 and MDR3 are "01", the register ORR1 and "01"
If not, the contents of the register ORR2 are sent to the display unit (DPC), and step # 49 is executed.
Move to Next, in step # 49, the contents of the register MDR are displayed on the display (DPC).
Set the terminal (O11) to "High" and set the light emitting diode (FLD) of the display unit (DPC).
Can be displayed. Next, it is determined whether any of the flags DCF1 and DCF2 is “1”,
If it is "1", it means that the data has been changed.
Wait for a certain period of time to prevent high-speed
Move to the top. On the other hand, if the flags DCF1 and DCF2 are both “0”, immediately
The process proceeds to step # 65. In step # 65, terminals (O2), (O3), (O4)
Is “High”, whether (i1), (i2), (i3) is “High”, that is,
, It is determined whether at least one key switch is closed. Any one
If it is closed, the data for 5 seconds is set in the internal counter ICO,
It is determined whether the switch (BMS) is closed. And the main switch
If (BMS) is closed, (O2) and (O4) are set to "Low" and the switch (ISS)
Is determined whether or not is closed. And if (ISS) is closed,
The lag ISF is set to "1", and the ORF and LMF are set to "0", and the process returns to the step # 14.
If (ISS) is not closed, it is determined whether the switch (ORS) is closed.
The ORF is set to "1", the LMF and ISF are set to "0", and the process returns to the step # 14. Sui
If both the switches (ISS) and (ORS) are open, the flag LMF is set to "1".
Return to step # 14. Therefore, 5 seconds without any switches closed
During the period, the exposure time and the aperture value are displayed. If all the key switches are not closed, the content of the internal counter ICO becomes "
It is determined whether it is "0" or not. If it is "0", the process proceeds to step # 67.
Transition. On the other hand, if it does not become "0", the reset switch (S4) is closed.
If the switch is not closed, the state of the main switch (BMS) is determined.
Separately, the process returns from step # 66 to step # 14. 5 seconds have passed since all key switches were released, or the reset switch (S4
) Is closed or the main switch (BMS) is opened, the step # 67 is started.
And the terminals (O1), (O5) to (O18) are set to "Low" to set the flags CCF, LM
F, ISF, ORF are set to “0” to enable interrupts using interrupt terminals (itA) and (itB).
The display is turned off and the HALT state is set in the same manner as the operation from step # 3 in FIG.
You. When the calculation of the exposure control value is completed and the flag CCF is "1", the release switch
When (S2) is closed, an interrupt to the terminal (itA) is accepted, and the process proceeds to step # 70.
Transition. In the step # 70, the terminal (O9) is set to “High” and the terminal (O8) is
A pulse of 50 μsec width is output to read data from the flash device. So
Then, it is determined whether or not the charge completion signal is input, and if it is input, the
Narrow down the contents of the register PVR2 in which the numerical aperture value for flash photography is set.
To the control circuit (APC).
Aperture Control Circuit (APC)
Send to Next, it is determined again whether or not the charging completion signal is input, and
If input, a register TVR2 in which the exposure time for flash photography is set
, A register TVR in which the exposure time for constant light shooting is set if not input
The content of 1 is sent to the exposure time control circuit (TIC). Next, the terminal (O9) is set to “High” and the flash device (FL) is connected to the terminal (O8) by 150
By sending a pulse with a width of μsec, the flash unit detects that the exposure control operation has started.
Determine. Then, the terminal (O11) is set to "Low" to turn off the light emitting diode (FLD).
The light emission display is not performed during the exposure control. Next, from the terminal (O12)
And a shutter release operation is performed by a release circuit (RLC).
To start the exposure control operation. When the exposure control operation is completed, the shutter curtain opens.
Wait until the reset switch (S4) that operates upon completion is closed, and (S4) is closed.
Then, the terminals (O2), (O3) and (O4) are set to "High" and the process proceeds to the step # 67.
Then, the same operation as described above is performed to enter the HALT state. FIG. 12 is a specific example of the display circuit of FIG. Terminal (CDP) becomes “High”
Then, every time eight synchronization clock pulses (SCPs) are input, the terminals (Kichi1), (Kichi2), (
A latch pulse is output from the latch control circuit (LAC) to the third controller. And in series
The data read by the input register (SIR) is sequentially stored in the registers (REG1), (REG
G2) and (REG3). Therefore, the register (REG1) has the exposure time or
ISO numerical data, (REG2) indicates aperture value or override numerical data, (REG2)
REG3) has the display mode data, that is, the register MDR in the microcomputer (MCB).
And the outputs of the terminals (e0) to (e7) are the bits MDR0 to MDR of the register MDR.
It corresponds to R7. The decoder (DE1) converts the output of the register (REG1) into a value for displaying the exposure time,
(DE2) is converted into a value for displaying ISO data. And a data selector (DS1)
If the terminal (e1) is "High", that is, if the exposure time display mode, the data from the decoder (DE1)
-Send the data from the decoder (DE2) in "Low", that is, in the ISO display mode.
Put out. The decoder (DE3) outputs the output of the register (REG2) to a value for displaying the aperture value.
, And the decoder (DE4) converts it for override display. And the data
If the terminal (e4) is "High", that is, if the aperture value display mode, the selector (DS2) is a decoder (DS2).
If the data from DE3) is "Low", that is, if it is not the aperture value display mode, the decoder (
The data from DE4) is output. The decoder (DE5) is connected to the terminal (e) of the register (REG3).
This is a decoder that converts the data from (0) to (e4) into data for displaying symbols.
. The timing signal output circuit (TIC) outputs a clock pulse of 8 Hz to a terminal (j1) and a clock pulse of 2 Hz to a terminal (j2).
A timing signal is sent to the path (SED). Then, the segment signal output circuit (S
ED) is based on data from the data selectors (DS1) and (DS2) and the decoder (DE5).
The output display signal is output, and the liquid crystal display is performed. Also, register (REG3)
If the terminal (e7) is "High", a clock pulse of 2 Hz is output from the AND circuit (G1).
The output and the liquid crystal display blink at 2 Hz. The signals from the terminals (e5) and (e6) of the register (REG3) and 8 Hz and 2 from (j1) and (j2)
The clock pulse of Hz is sent to the drive circuit (LDC), and the terminal (DPE) is set to “High”.
, A drive signal corresponding to the flash state is output to the terminal (FLD).
You. FIG. 13 shows a specific example of display in the embodiment of the present invention. First
FIG. 3 (a) shows an example of the display state when setting the exposure time.
The first display unit, which is also used for displaying the degree, indicates a shutter speed of 1/2000 seconds.
Is displayed, and at the same time, the aperture value F5.6 is displayed on the second display unit.
It is shown. On the other hand, FIG. 13 (b) shows an example of the display state when setting the film sensitivity.
, The film sensitivity ISO400 is displayed on the first display unit, and the second display
Nothing is displayed in the section. Modification In the above embodiment, the exposure control mode is controlled by a slide switch.
The mode was set on the board, but the ISO, override, Tv,
You may make it set with a key switch similarly to Av. In this case, the modkey
The microcomputer (MCB) has another output terminal for the switch linked to
This output terminal and input terminal (i ₁ ), A mode switch is provided. If you do this
, Photometric switch (S ₁ ), ISO switch (ISS), override switch (O
RS), the interrupt terminal of the microcomputer (MCB) when the mode switch is closed.
The interrupt signal is also input to the child (ita), and the operation of the microcomputer (MCB) starts. And
The flow chart shows that when the mode switch is closed, the photometry switch (S ₁ )But
The flag LMF is set to "1" as in the case where the switch is closed. And step # 16
Operation status of UP switch (UPS) or DOWN switch (DOS) before
When the UP switch is operated in accordance with the conditions (A) to (D), the mode is changed from P-mode to S-mode and from S-mode to A-mode
Mode, A mode to M mode, M mode to P mode, and DOWN switch
When the switch is operated, the P mode is set to the M mode, the M mode is set to the A mode, and the A mode is set.
The mode is switched from the S mode to the S mode and from the S mode to the P mode. After the above operation, the process proceeds to step # 16. Also, a table of exposure time and aperture value
At the time of indication, the mode display data is also sent to the display unit, and the mode display data is sent to the display unit.
It is necessary to provide a data decoder. In addition, ISO, override
At the time of display, this mode display is turned off. [Effect of the Invention] As described above in detail, according to the present invention, not only the operation of the release button but also the exposure
Set only by data setting operation by operating the operation member for data setting related to control
Calculation based on the data and the photometric value is performed. For example, the setting data and the calculation result are
By displaying on the display device, the operator can confirm and the operability of the camera
Can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing the appearance of a camera to which the present invention is applied, FIG. 2 is a view showing the inside of the camera of FIG. 1, FIG. 3 is a film counter and a counter switch, FIG. 4 is a plan view showing a relationship between a back cover and a back cover open / close detection switch. FIG. 4 is a block diagram showing an embodiment of a camera system to which the present invention is applied. FIG. 5 shows a main part of the camera system shown in FIG. FIG. 6 is a perspective view showing a portion for reading data from the film container, FIGS. 7 to 11-1 to 11-4 are flowcharts showing the operation of the camera system shown in FIG. 4, and FIG. FIGS. 13 (a) and 13 (b) are block diagrams showing another embodiment, and are diagrams showing an example of display on the display device. DESCRIPTION OF SYMBOLS 1 ... Camera body, 2 ... Release button, 7 ... Up key, 8 ... Down key, 10
... ISO mode key, 11 ... Over key, S1 Photometric switch, LMC
... photometric circuit, MCB ... microcomputer (microcomputer).

Claims (1)

Claims: (1) An operation member for setting data related to exposure control, a release button for instructing start of a preparation operation for photographing, photometric means, and a data setting operation member A data output means for outputting data relating to exposure control as an electric signal; a calculation means for performing a predetermined calculation based on an output of the photometry means and data from the data output means; and a release button and a data setting operation member. Control means for starting the operation of the photometric means, the operation of the arithmetic means based on the output of the photometric means and the output of the data output means , and the control means operates at a predetermined time after the operation of the release button or the data setting operation member is completed.
A camera characterized in that the operation of the photometric means and the arithmetic means is continued during the interval . (2) The second data setting operation means is provided, and the control means does not start the operations of the photometric means and the arithmetic means when the second data setting operation means is operated. 2. The camera according to claim 1 , wherein the second data setting operation means is operated after the operation of the calculation means is started, and the operation of the photometry means and the calculation means is continued for a predetermined time after the operation is completed. . (3) The apparatus further comprises means for displaying the set ISO data or calculation data, wherein the setting operation member is an operation member for setting the ISO data, and the display means displays the ISO data during operation of the setting operation member and performs predetermined operation after the operation. 2. The camera according to claim 1, wherein the time is calculated data.