JPS619629A - Camera - Google Patents

Abstract

PURPOSE:To eliminate the problem of the loss of stored data in the stage of exchanging a battery by reading automatically the data of a film case within a memory without fail when the power source battery is replaced if the data is provided to the film case. CONSTITUTION:PO1 is mounted with the power source battery BAG and outputs a power on reset signal from a terminal PR1 when power feed is restarted from a power source line VC. MCB is a microcomputer and a key matrix is formed of the output terminals o2-o4 and input terminals i1-i3 thereof. The closed switches are discriminated by the microcomputer. The terminal itA is interrupted and the microcomputer is started when the ISO switch is closed. The output of an inverter IN2 turns low and the microcomputer is stopped in operation when the BMS switch is opened. The data of the film case is always automatically read into the memory when the power source battery of the camera is replaced and therefore the problem of the loss of the stored data in the stage of exchanging the battery is basically solved.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industry". Field of Application] This invention relates to a camera, and more particularly to a camera that controls exposure by reading data on a film container.

[Prior art 1] In this type of camera, Japanese Patent Application Laid-Open No. 57-202524
As disclosed in 1), data from the film container 1 is always read during exposure calculations, and exposure calculations are performed based on the read data.

[Objective of the Invention 1 This invention does not use a format that is constantly read when performing exposure calculations as described above, but reads the data read from above the film container when the film container is attached and the back cover is closed. The following assumes that the camera is of a type that stores the following data and performs exposure calculations based on this stored data. The purpose of this invention is to solve problems that arise in cameras based on this premise. To explain in more detail, in order to retain stored data in the above-mentioned camera, it is necessary to constantly supply power from the power supply battery to the memory circuit. By the way, if the power battery is removed during film shooting, the data in the memory circuit will be lost, and even if the power battery is attached next time and shooting is performed, correct exposure control will not be possible. The purpose of this invention is to
The object of the present invention is to solve such problems and provide a practical camera based on the above format.

[Structure 1 of the Invention] The camera of the present invention includes a reading means for reading data from the reading means into a control device when a power battery is installed in the camera, and a reading means for reading data from the reading means into a control device, and data being written on a film container based on the data from the reading means. a determining means for determining whether data is provided on the film container; and when the determining means determines that data is provided on the film container, the data from the reading means is stored; When the determining means determines that the data is not provided on the film container, the determining means stores the fixed data, means for issuing a warning when determining that the data on the film container is not provided, and the determining means stores the fixed data. means for prohibiting the transition to exposure control operation when it is determined that the film is not provided; It is provided with means for detecting the presence or absence of the film, and means for disabling the operation of the inhibiting means when the detecting means detects that the film is not mounted.

With the above configuration, if data is provided on the film container, when the power supply battery is replaced, the data on the film container is automatically written into the memory to compensate for the lost data. Furthermore, when replacing the power battery,
If data is not read from the film container, the fixed data is temporarily stored and movement to exposure control operation is prohibited, and a warning is displayed to notify the user that the fixed data has been stored. inform.

Then, when manual data setting is performed, the above prohibition is canceled and shooting is enabled, and there is no need to prohibit exposure control operation if the battery is installed but no film is installed. The above-mentioned prohibited operations are not performed to prevent unnecessary system operations.

[Example 1 An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is the camera body, 2 is the release button, and when the release button 2 is manually pushed to the first step, it is a photometering switch S1 that instructs photometry, and when it is pushed to the second step, it is turned on and operates the shutter. The camera is also equipped with a release switch S1.

3 is a mode changeover switch using a slide switch, P is a program mode, S is an exposure time priority automatic aperture mode, M is a manual mode, and A is an aperture priority exposure time automatic mode. 4 is a display device on which control exposure time, aperture value, and film sensitivity override data are displayed.

5 is the aperture value setting key, 6 is the shank speed setting key, 7,
8 is an up key and a down key for changing the aperture value F and shutter speed SS. Reference numeral 9 is a counter display window, in which the number of frames taken on the film is displayed.

10 is an ISO mode key, and when this ISO mode key is pressed, the ISO data used in the camera body 1 is displayed on the display section 4, and the ISO data can be changed using the up key 7 and down key 8. becomes.

Reference numeral 11 denotes an override key. When this key is pressed, override data is displayed on the display section 4, and the override data can be changed by operating the up key 7 and down key 8. 13 is the back cover 13 of the camera body 1
This is the film information display window installed in the camera.

As shown in FIG. 2, the camera body 1 shown in FIG. 1 is provided with hood reading contacts 15 and 16 for reading ISO data provided on the film container 14. The contact pieces IS, 16 are formed on the outer peripheral surface of the film container 14, as shown in FIG. 6, and are a plurality of contact pieces AT2 to AT6. FT8. FT9. FTlo, RTl
l, has RT12.

Each of the contact pieces AT2 to RT12 is fixed to a support 18 made of an insulating material and provided upright within the camera body 1 with screws or the like.

Inside the camera body 1, as shown in FIG. 3, there is a back cover opening/closing detection switch 31 that is turned off when the camera back cover 33 is closed and turned on when it is opened, and a counter switch that is linked to a film counter 34. 34 are provided. The counter switch 34 is opened and closed by a lever 36 operated by a cam 35, and is turned on when the count value of the film counter is between S and 1, and turned off when it is 1 or more.

FIG. 4 is a block diagram of the entire camera system to which the present invention is applied. (Tool) is a power-on reset circuit that outputs a power-on reset signal from a terminal (PRI) when the power supply battery (BAB) is installed and power supply from the power line (VC) is resumed.

(MCB) is a microcomputer (hereinafter referred to as a microcomputer) that controls the operation of the entire camera system. The operation of this microcomputer <MCB> is shown in the flowcharts of FIGS. 7, 8, 9, 10, and 11.

(Sl) is a photometric switch and is closed when the release button 2 is pressed in the first step. (ISS) is the ISO mode key (1
(OR3) is a switch that is closed when the override key (11) is pressed. (FSS
) is a switch that is closed by pressing the aperture value setting key (5), and (S S S ) is a switch that is closed by pressing the exposure time key (6). (Ups) is the up key (7), (DO3>
are switches that are closed when the down key (8) is pressed, and these switches are connected to the output terminals (02), <03), (04) and input terminal (il) of the microcontroller (MCB).
), (i2), and (i3) constitute a key matrix, and a microcomputer (MCB) determines which switch is closed.

This microcontroller (MCB) has a terminal (
02), (03), and (04) are "High", and the lines connected to the input terminal (11) are the AND circuit (ANl), the OR circuit (ORI), and the AND circuit (AN3).
) to the interrupt terminal (itA). Therefore, when the photometry switch (Sl), ISO switch (ISS) or override switch (ORS) is closed, an interrupt is generated at the terminal (itA).
is activated.゛ (BMS) is the main switch, and when this main switch (BMS) is opened, the output of the inverter (1N2) becomes "Lou+", the microcomputer (MCB) stops operating, and the AND circuit (AN3) is disabled, no interrupt signal is input to the terminal (itA), and the microcomputer (MCB) is not activated.

Also, the power supply type temperature (BAB) is removed and the line (VC
), if power is not supplied from the AND circuit (
AN3) is disabled and no interrupts are made. Therefore, if the power battery (BAB) is not installed or the main switch (BMS) is open, the microcomputer (MCB) remains in an inactive state.

The switch (Sl) is a switch that is closed when the release button (2) is pressed in the second step. When this release button switch (Sl) is closed, the inverter (IN
3) becomes “High” and the AND circuit (AN2
), an OR circuit (ORI), and an AND circuit (AN3) to input an interrupt signal to the terminal (itA). When this interrupt signal is input, if shutter charging has been completed and calculation of exposure control data has been completed, the exposure control operation is immediately started. In addition, the release button switch “Tsuchi (S)
The interrupt caused by 2) causes the output of the OR circuit (OR3) to become "High" and the AND circuit (AN2) to be disabled while the microcontroller (MCB) is exchanging data with other circuits. , so no interrupt is performed.

As shown in FIG. 3, the switch (RC8) is a back cover switch that is closed when 3) is opened on the back cover of the camera and opened when it is closed. Therefore, when the back cover is closed, the output of the inverter (IN4) becomes "Hi gI+", a pulse is output from the one-shot circuit (O31), the flip-flop (RFI) is set, and the terminal (itB ) an interrupt signal is input.

Then, the microcomputer (MCB) performs the operation when closing the back cover, and when this operation is completed, it outputs a pulse from the terminal (018) to reset the 7-rip-flop (RFI) and enters the operation stop state.

(LE) is an interchangeable lens and connector (CNF).

(CNBI) is electrically connected to the camera body,
Data such as aperture value, which is fixedly stored in a circuit (LEC) within the lens, is read in series into a microcomputer (MCB) via an interface circuit (BOL). This operation is performed by the microcontroller (MCB) when the terminal (05) is
h” and execute the serial input/output command, eight clock pulses are output from the serial clock pulse terminal (sep).Then, in synchronization with these clock pulses, the lens (
Data is input in series from LE), and this data is read from the serial input terminal (SIN) at Hiiragi. By repeating this serial input command multiple times, all necessary data from the lens (LE) is read.

(CAD) is a code pattern circuit that outputs code pattern data provided on the film container (14), (M) is a hood board that outputs data corresponding to the set exposure control mode, (SFC) is a film There is a counter switch (corresponding to FIG. 3, 32) that is closed when the counter is in the preliminary winding position and opened when the counter is in the photographing position.

(BUB) is a backup battery, and (CIM) is for storing ISO data and data from the film container (CIM).
This is a circuit for reading AD), mode data, and signals from the film counter switch (SFC), and a specific example is shown in FIG. This circuit (CI
M) is the diode (
Power is supplied via the main battery (B
AB) is also supplied with power via a diode (D20). (BCC) is a circuit that changes the output voltage of the bank-up battery (BUB), and the transistor (BT
If power is being supplied from the power line (＼・°B) via O) and the output of the backup battery (BUB) is above a predetermined value, a "HiHI+" (7) signal is output to the terminal (i20). (PO5) is a backup battery (BUB)
This is a power-on reset circuit that outputs a reset signal when the is installed.The reset signal from this circuit (PO5) is sent only to the ISO data storage register in the circuit (CIM), and the contents of this register are It is reset only when the backup battery (BUB) is installed.

The terminals (030), (031), and (032) are connected to the circuit (
This is a terminal that controls the operation mode of the circuit (CIM).
IM), an operation is performed according to the output of this terminal.

And the OR circuit (OR50) is this terminal (030),
(031) and (032) are input terminals, and output terminals are connected to input terminals of an OR circuit (OR3). Therefore, if data is being exchanged between this circuit (CIM) and the microcomputer (MCB), interrupts to the terminal (itA) by the release inch (S2) are prohibited.

In Figure 5, (SDI) receives data input serially from the terminal (Sou) of the microcomputer (MCB) to the terminal (SDI).
A counter (LPC) that operates in synchronization with the clock pulse from the terminal (CP), which operates when the terminal (030) becomes "Higb", counts the synchronizing clock pulse when the terminal (030) becomes "Higb", and After counting clock pulses, a latch pulse is output. This latch pulse is sent to the register (LAC), and when this pulse is input, it latches the data from the reading circuit (Sl). The registers (LA, C) are reset by a pulse from the power-on reset circuit (PO5) of FIG.

(DSC> is the data selector and the terminal (031)', (
032) is "'01", the ISO data stored in the register (LAC) from the input section (al), "
If it is 10, the data on the film container from the input section (α2) is output, and if it is "11", the mode and film counter switch signals are output from the input section (a3). In addition, the data selector (DSC) whose output from terminals (031) l (032) is 9゛oo'' does not output data.
When the output of 2) becomes 'High', the data selector (D
The data from SC) is sequentially output to the terminal (SIN) in series based on the synchronization clock pulse.

The configurations of (CAD) and (EM) in FIG. 4 are shown in FIG.

In FIG. 6, code patterns 1 to 0 are provided on the film container (14). The portions ① and ② are conductive portions in any film container, and in this embodiment, they are 2-wire.

(COT) contact. ■~O is a film container (
14) Conductive and non-conductive patterns are provided according to the data corresponding to the ISO sensitivity of the film, an example of which is shown in Table 1.

These ■~■ parts have contact pieces (A'T2)~(AT6), respectively.
) is in contact, and this contact piece is input to the input terminal (α2) of the data selector (DSC) in FIG. 5 via a pull-up resistor and an inverter. A hood pattern corresponding to the number of frames of the film (60) stored in the film container (14) is provided in the portions 0 to 0. This part has contact pieces (FT8L (FT9), (FTI
(F T8), (F T9); (F
Data from Tl0) is not input anywhere.

Exposure range is included in the OtO part.
data is provided. This code is shown in Table 2.

11. In the part 12, there is a contact piece (RTIL), (R1N2
) is contacted, and a signal from this contact piece is input to the input terminal (a2) of the data selector (DSC) via a pull-up resistor and an inverter.

(MTI), (VT2), and (CMT) are code plates for data output in exposure calculation mode, and this code plate (MTI>
.

A sliding member (VT) moves on (VT2) and (CMT) according to the mode setting by the mode changeover switch 3.

If the sliding member is in position (VT) or (P), it is in program mode and the data is "oo", and if it is in position (S), it is in exposure time priority mode (hereinafter referred to as S mode).

If the data of "11" is at position (A), the data of "10" is in the aperture priority mode (hereinafter referred to as A mode).
M), the manual key inputs data "11" to the input terminal (α2) of the data selector (DSC). In addition, film counter switch (SFC)
) is also input to the input terminal (α2) of the data selector (DSC) via the inverter (INS).
It will be done.

Referring again to FIG. 4, (FL) is a flash light emitting device, inside which there are a power source battery (BAF), a light emitting and control circuit (FLC), and main switches (FM, S). Connector (CNF) for flash device (FL)
When the 7 runcill device (FL) is attached to the camera body, it is electrically connected to the connector (CNB2) and performs operations such as exchanging data with the control circuit (FCC) and controlling the amount of light emitted. It will be done.

('LMC) is a photometric circuit, and the photometric output of this photometric circuit (LMC) is input to the analog input terminal (ANI) of the microcontroller, and the reference potential for D-A conversion is input to the terminal (VR
I). (DPC) is a display circuit that drives a liquid crystal display (LDP) for displaying data and a light emitting diode (FLD) for displaying 7-laser photography. The display circuit (DPC) takes in the display data output from the terminal (SOU) while the terminal (C) 10) is in "Hilly" state, and performs display based on this data. This will be described later based on the figures. (RLC) is a release circuit, which releases the lock of the exposure control mechanism based on a pulse from the terminal ((>12).

(APC) is an aperture control circuit, and this aperture control circuit (
A P C) High (013) 7" Reads the number of aperture stages data sent from the terminal (SOU) during 'Higl+', and if the actual number of aperture stages matches the read data, the aperture of the camera is stop the aperture and determine the aperture aperture. (TIC) is an exposure time control circuit, which reads the exposure time control data output from the terminal (SOU) while the terminal (014) is "Higl+" and starts from the time when the count switch (SS) is closed. The shutter closing operation is started after the time corresponding to the read data has elapsed.Furthermore, when the release signal (RLS) is output to the terminal (TIE), tH; gl, ++
When a certain period of time (for example, 5.0 m 5ec) has elapsed since the shutter closing operation was started, it becomes "Low".

Next, the operation of this system will be explained based on chart 70 in FIG. When the power supply from the terminal (VC) starts, the power supply to the microcontroller (MCB) starts and the microcontroller (
MCB) performs an initial reset operation. Also,
The power-on reset signal (PR, 1) resets the 7-lip/70-tub (RFI) and also resets the display circuit (DPC) supplied with power from the terminal (VC).

First, the microcontroller (MCB) connects the terminal (
Set terminals (01) to (04) to “High” and connect terminals (05) to
(018) to 11 L oIII+. moreover,
Connect terminal (031) to 11 ) (i gl, II, terminal (0
30), (032) wo"Lou+"とL te, taii
[l: Series input/output operation is performed after waiting for a certain period of time required for the vibrations to subside and for the contact between the contact piece and the film container to become stable. Then, the data on the film container from the detection unit (CAD) is read into the register IOR via the circuit (01M), and this data is read into the register CA.
Set to R. Table 4 shows how to set data in register CAR.

Next, a serial input/output operation is performed with the terminal (032) set to "'High", and the ISO data stored in the register (LAC) is read. This read data is set in the register or MER. Next, the terminal (031) is also High.
h", read the mode data and counter switch data, and set this data in the register MOR. Next, determine whether the input terminal (i20) is "High" and set it to "'High's". If so, the output voltage of the bank up battery (BUB) is sufficient, and then it is determined whether the data read from the register (LAC) is normal.This determination is made if all bits are not 0. All you need to do is to determine that the backup battery (BUB) is normal and the register (LA
If the data from C) is normal, the data (MER> read from the register (LAC) is set in the register SVR, and the process moves to step I3.

If the output voltage of the backup battery (BUB) is below the predetermined value in step #1, or if normal data is not read from the register (LAC) in step #2, proceed to step #4. Transition. #4
In the step, it is determined whether the data from the film container has been read by determining the contents of the register CAR, and if it has been read, the ISO data is Set to S to 7R, and if it is not read, set fixed data 5vn (for example, I Sol 00Sv = 5) to register S V R
Set to . Next, set the contents of register SVH to the input/output register IOR, and set the terminal (030) to 'Hi g
h" to perform serial input/output operation, thereby sending the contents of the register SVR to the storage register (LAC).Next, if fixed data is set, Pino) MD
Set RO and MDR7 to 1, and the remaining bits to 0.
Set ゛. Here, the register MDR is a register in which data indicating the display mode is set, and the meaning of each bit is as follows.

Bin) MDRO is "0゛" when neither the ISO symbol nor the SS symbol is displayed, and when the ISO or SS symbol is displayed, the outside value is "1゛1".

MDRl is "1" when displaying the exposure time on the display.
”, and when the ISO data is displayed, the outside will be “0゛”.

When displaying override data, MDR2 and MDR3 display "01" if the override data is +1, "10" if it is negative, and "11" when the override data is 0 and display the override data. When not displayed, it is "'oo". Therefore, if MDR2 and 3 are "00", no display regarding override is performed, and if it is "01", the override symbol "10/-" and "10" are displayed in front of the override data, and "10" is displayed. Then, symbol II ten/II
"-" is displayed in front of the override data, and if it is 11, the symbol "+/-" is displayed, and in this case, the override data is displayed as O, and "10" is displayed in front of that data. Neither "-" is displayed. Note 1. The symbol “+/
-゛Even when displaying the exposure control value, MDR2,
If 3 is "01" or "'10", it will be displayed.

MDR4 is "°1" when displaying the F position, and "0" when not displaying the F position. Therefore, when it is 1, "F II" is displayed, and when it is "0", "F II" is displayed. ” is not displayed. MD, R5, and MDR6 are set with signals indicating the display mode of a light emitting diode (FLD) that indicates the status of the flash device. At "°00", the flash device is not attached to the camera body (FL D ) and is off. “01゛1 indicates that the flash device is attached and power is being supplied, and it blinks at 2H2.10
’, the 7-lush device indicates that it is fully charged, and the light emitting diode (FLD) lights up.
When it is "11", it indicates that the dimming has been completed, and the light emitting diode (FLD) blinks at 8Hz. When the MDR7 is "1", the entire LCD display blinks at 2Hz, and when it is "°0", it blinks at 2Hz. Light.

Next, the contents of the register SVR, the data BLD for blank display, and the contents of the register MDR are sent to the display unit (DPC), and the terminals (02) and (04) are set to “Low” and assigned to the terminal (iLAL (itB)). wait for 10 seconds. Therefore, the microcontroller (MCB)'s ti!
B) is installed, the contents of the memory circuit (LAC) powered by the backup battery (BUB) are gone, the output of the backup battery (BUB) is not normal, and the data on the film container is zu<IS
If the O data is not read and fixed ISO data is set, this data will be displayed blinking for 10 seconds to issue a warning. Furthermore, if it is determined by bit 2 of register MOH that the film counter switch (CF S ) is open, the terminal (02);
04) to “Loud”. Therefore, the ISO switch (
Since an interrupt signal is input to the terminal (itA) only when the shutter (ISS) is closed, the exposure control operation is not started even if the release button is operated, and the release is locked. To get out of this state, just operate the ISOS switch or wait 10 seconds. Further, when it is determined that the film counter switch (CF S ) is closed, it is unlikely that a film is loaded, and the release lock is not performed and the process waits for 10 seconds.

After 10 seconds have passed, connect terminals (02) and (04) to “
``High'', the process moves to step #3, sends data for displaying the ISO data to the display section (DPC), and enters the HALT'' state. In addition, the register (LAC
) When normal ISO data is read from ), set this data and immediately proceed to step #3.18
A lighting display of 0 is performed. Also, register (LAC)
Even if normal data is read from the film container, the ISO indicator lights up and the release lock is not activated.

FIG. 8 shows the operation when the back cover is closed and an interrupt signal is input to the terminal (itB). First, the camera back is closed and a certain period of time (for example, 0.5 seconds) has elapsed. This is because the film container is vibrating immediately after the back cover is closed, and the film container (14) and contact point (15) (
This is because the contact with 16) is not stable. Next, connect the terminals (σ2), (03), (04,) to ``old gl, II
, terminals (01), (05) to (018), (030
), (032) are set to 11 J, oll, and the terminal (031) is set to "High" to perform serial input/output operation. This allows the data on the film container to be read. Next, based on the read data, it is determined whether or not data is provided on the film container, and if so, it is determined based on this data.
The SO data is set in the register SVR, and if no data is provided on the film container, the contents of the register SVR are left as they were.

Next, set the bit MD'RO to ll'll, and the remaining bits, 2
The set ISO data is displayed by setting MDRI~7 to "0" and sending the contents of register SVR, blank data (BLI), and register MDR to the display unit (DPC).Then, terminal (018) Generates a pulse to reset the 7rip7c7yp (RFI) and connects the terminal (
It waits for 5 seconds with interrupts to itA) and (itB) enabled, and when the 5 seconds have elapsed, the display is turned off in the same way as the operation from step #3 in FIG. 7, and the 'HALT' state is entered.

Here #4. A specific example of determining whether #8n (CAR) exists is shown in Part 9.
This will be explained based on the diagram. As shown in Table 1, in the case of a film container provided with a code pattern, at least one of the ■ and α portions is necessarily a conductive portion. Therefore, if "°1" is read into either CAR4 or CAR3 of the register CAR, it is assumed that a container provided with a food pattern is attached, and data from the code pattern is set.

On the other hand, if both bits are 11011, it means that a film container without a code pattern is installed or a film container is not installed.In this case, the No data settings are made.

Next, based on FIG. 10, #7. A specific example of the operation of setting the film sensitivity in step #10 will be explained. First, 161-1 (H indicates a hexadecimal number) is set in register SVR.

Here, the registers SVR1 and SVR2 are 8 bits, and each bit is weighted 16.8.4, 2, 1°1/2.1/4.1/8 from the most significant bit.

The film sensitivity is set to change in units of 1/3 Ev using the apex value. Therefore, if the decimal part of the sensitivity of the film set in the camera is 1/3, then
4. If it is 2/3, approximate it to 3/4 (=1/″4+1/2).

Therefore, 16o set in register 5VRI in step #1 corresponds to S v = 23.

Next, first, bit CAR4°CAR of register CAR
If 5 is '11', it is '08 n', and if it is 10, '
04H”, “01” then “02H11” in register 5VR
Add to the contents of 1. Therefore, the fractional bit is “11”
Then, add Sν=1 to make “1EH”, and the decimal part is 3/
Make it 4. Also, if the decimal part bit is 10”, 5v = 1/
Add 2 to make it ""IAH" and make the decimal part 174, and if the focus of the decimal part is °01, add 5v = 1/4 and °'
18H” and the decimal part is ().

Next, register CAR's beep) If CAR2 is 1, 5v = 4
, if CA R1 is 1, 5v=2, if CARO is 1, Sν
=1 is added to the contents of register 5VRI.

The above operation will be explained by taking as an example the case where the film container of 15O400 is attached to a camera. In this case, as shown in Table 1, the parts marked with ■ and ■ are conductive parts.

And in register CAR, bit CAR3, CA
R2 is °"I'", C, AR4, CARI.

CARO is 0゛. Therefore, Regis 2SVR
22o is added to I, resulting in 381(.

This data is 4+2+ depending on the definition of the weight of each bit.
1=7, and the 7pex value at l5O400 is 5v=7
It becomes.

Next, the operation in FIG. 4 will be explained based on the 7o-chart in FIG. 11-1.2.3.4. Main switch (BMS)
) is closed and the power battery (BAB) is installed, the outside, photometry switch (Sl), and ISO switch (I
SS), override switch (OR3) is closed, the terminal (i
An interrupt signal is input at tA>, and the operation starts from step #11. First, determine whether the content of the 7-lag CCF is "1".This 7-lag CCF becomes "1" when the data for exposure control is calculated, and "()" when the data for exposure control is not calculated. The operation when an interrupt signal is input to the terminal (itA) with the exposure control value calculated will be described later.

When the 7-lag CCF is “0”, then the terminal (01) is set to “H”.
"high". This makes the transistor (BTO
) becomes conductive and power supply starts from the line (VB).

Furthermore, the AND circuit (ANI) becomes disabled, the AND circuit (AN2) becomes active, and the signal from the release switch (S2) is sent to the terminal (itA) as an interrupt signal.
The state becomes ready for input. Next, by setting the terminals (03) and (04) to 11 L olIII, only the terminal (02) becomes If ) (i gl, II, and the terminal (11) becomes Hi.
HI+” is determined.

If the terminal (11) is "High", it means that the photometric switch (Sl) is closed and an interrupt has occurred, and the flag LMF is set to 1, and the terminal (02) is set to "L". Make it. Switch (SI) is open and #13
If it is determined that the terminal (11) is "Low" in the step, then only (03) is set "High" and the terminal (
11) is “High”. At this time"
H! gh”, ISO switch (ISS) j
This is a case where an interrupt is performed, and if the 7-lag ISF is set to 1 and the terminal (11) is "Lou+", it is a case where an interrupt is performed by the override switch (ORs >), and the 7-lag ORF is set to "Lou+". “Set it to 1. Then, the terminal (
03) to "Lou+" and proceed to step #14.

In step #14, the terminal (05) is set to "High". Then, data from the lens (LE) is read by performing serial input/output operations a plurality of times (a predetermined number of times), and the read data is sequentially set in a plurality of registers LDR. When this operation is completed, the terminal (o5) is set to “L0111”.
and set the terminals (031) and (032) to "High". After this operation, serial input/output operation is performed to read the mode signal applied from the hood plate EM and the signal from the counter switch (SFC), set it in the register MOR, and connect the terminals (031) and (032). Set it to “Lou+”. The mode data is MORO.

The counter switch (SFC) signal is MO
It is set to R4. The state of the film counter and the exposure control mode signal have now been taken into the register MOR.

Next, set the terminal (09) to “High” and connect the terminal (08) to
- Outputs a pulse with a width of 50 μsec. After setting the data "oon" in the input/output register IOR, the serial input/output operation is performed. Then register IOR
7, the data from the flash device (FL) is imported,
This data is set in the register, FDH. Then, the terminal (o9) is set to "Lou+" and the process moves to step #15.

In step #15, the output representing the photometry result of the subject obtained from the photometry circuit (LMC) is converted from A to D, and then,
Open aperture value Avo included in the A-D converted data
, to remove the term of open photometry error Avc based on the data from the lens (LE) (Bv-Avo-Avc)
+Avo+Avc=Bv is calculated to calculate object brightness data.

and, Bv 10 (SVR) = Ev The following calculations are performed to calculate the exposure value Ev.

Next (Pin point of this register MDR Determine whether the contents of MDR29MDR3 are ""01" and if it is "01", it is a + side override as mentioned above, and the contents of register 0RR1 where the + side override data is set) is subtracted from the exposure value Ev to calculate the Ev value.If the contents of MDR2 and 3 are not '01', then it is determined whether or not the parameter is 10', and if it is '10', one side override has been performed. Therefore, the contents of register 0RR2, in which negative override data is set, are added to the exposure value Ev to obtain Ev.
When the operation beyond calculating the value is completed, the process moves to step #16, and thereafter, the operation of calculating data for exposure control is performed. In step #16, it is determined whether it is P mode or not, and P
If the mode is P mode, the following calculations for steady light photography and flash light photography are performed, and the flag DCFI is set to ``0''.
Set " and move on to step #18. Here, 7-lag DCFI is a flag that becomes "1" when the set aperture value or set exposure time is changed, and "0" when there is no change, and neither data change is accepted in P mode. The flag DCFI becomes "0".

If it is determined in step #16 that the mode is not P mode, the process moves to step #19 and it is determined whether the mode is A mode. If the mode is A, a change in the set aperture value is accepted, so this data change operation is performed first. First, the terminal (0
2) is set to “High” and the terminal (12) is set to “High”.
Determine whether or not. If the terminal (12) is "High", the aperture setting switch (FSS) will be closed. Then, the terminal (i3) becomes '.

If it is “High”, it means that the up switch (UPS) is closed. In this case, set the terminal (02) to “Loud” and send the data to the small aperture side. Performs a changing operation.In other words, the contents of register AVR3, where the set aperture value data is set, are changed to the lens (L).
First, it is determined whether the aperture value data A vo (this data is sent from the ROM of the lens) is on the aperture side. and open aperture value Avo
If the data is on the open side (this occurs when the lens is replaced), the contents of the register AVR3 are set to Avo and the process moves to step #20. If the contents of register AVR3 are not more open than Avo, then it is determined whether they are equal to Avo or not, and the data dAν from the equal sharpening lens (LE) is added to the contents of register AVR3, and if they are not equal, 17'2 is added to the contents of register AVR3. Then, the contents of register AVR3 are the maximum aperture from the lens (LE)1)
It is determined whether the value is larger than the value data AVI11, and if it is, the maximum aperture value AvI11 is set in the register AVR3 and the process moves to step #20.
If it is not larger, proceed directly to step #20.

Maximum aperture value data Avon is also sent from the lens ROM.

The data dAv will now be explained. There are various values for the open aperture value of interchangeable lenses, and the value is in units of 0.5Ev (Avo=
0.5, 1.0.1.5, 2. Some are (1'-), and some are not in 0.5Ev units (
For example, F2. S(Av=2.6.4), F3.5(Av
"3.61), Fl, 8 (Av=1.7), etc.). By the way, the aperture values set on the camera side are in a series of 0.5Ev units, except for the maximum aperture value. Therefore, If the open aperture is not set in 0.5Ev increments, from the open aperture to the next set aperture, the value will change by a value dAν smaller than 0.5Eν, resulting in a value in 0.5Ev units, and thereafter the aperture will become smaller in 0.5Ev increments. It changes to the side.

Therefore, for an F2.5 lens, dAv=0.36. F3
．． For the lens No. 5, cl, AV = 0.39-Fl, and for the lens No. 8, 'bdAv = 0.3. This data clAv is also sent from the ROM of the lens. , If it is determined that the amplifier switch (UPS) is not closed because the terminal (+3) is not "HigI+" at the timing when the terminal (02) is "High", the terminal (02) is set to "Lo", Set only the terminal (03) to “High” and set the terminal (
13) It is determined whether the down switch (D OS ) is closed or not. Down switch (DO
8) is determined to be closed, the terminal (03)
II Lo,! +, 1/2 is subtracted from the contents of the register AVR3, and it is determined whether the result of this subtraction is on the open side rather than the open aperture value Avo. If the value is on the open side, set the open aperture value Avo to register AVR3.
, and move on to step #20.

In step #20, ' sets the flag DCFI to "1" to indicate that the configuration data has been changed, and #
Move to step 21. On the other hand, the aperture switch (FS
S) is not closed or the up switch (up
s), down switch (D.

If both of S) are not closed, no data change is performed and 7 lag DCF1 is
” and move on to step #21;7).I21
In step , a calculation for steady light photography in the A mode is performed, and then in step #22, a calculation for 7-lash light photography in the A mode is performed, and then the process moves to step #24.

If it is determined in step #19 that the mode is not A mode, it is determined in step #25 whether or not the mode is S mode.

If it is determined that the mode is S mode, then step #25. At #26, it is determined from the state of the terminal (+2) whether the exposure time switch (SSS) is closed. Then, if it is determined that the exposure time switch (SSS) is not opened, 7 lag D is detected in step #28.
The CFI is set to "0" and the process moves to step #29. On the other hand, when it is determined in #27 that the exposure time switch (SSS) is closed, the up switch (ups
, ) is closed. And #30 confirms that the amplifier switch (UPS) is closed.
When it is determined in step , 1 is added to the contents of the register TVR3 in which the set exposure time data is set.

It is determined in step #31 whether or not this addition result is larger than the data Tvm of the shortest exposure time.
Set VII+ in register TVR3, and if it is not large, leave it as is and set flag DC in step #32.
Set FI to II I II and proceed to step #29.

If it is determined in step #30 that the up switch (UP S ) is not closed, then it is determined in step #33 whether the down switch (D OS ) is closed. and down switch (DO3)
is closed, register TVR is closed in step well 34.
Subtract 1 from the contents of 3, determine whether the subtraction result is a value longer than the maximum exposure time Tvo, and if it is a long time, set Tvo to register TVR3 and it is not a long time. When, leave the flag DCFI
Set "°1" to "°1" and proceed to step #29.

When the exposure time switch (SSS) is not closed,
Or, even if it is closed, if both the up switch (Ups) and down switch CD08) are not closed, 7
Set the lag DCFI to '°0' and proceed to step #29. In step #29, calculations for constant light photography in S mode are performed, followed by calculations for 7 lash photography in S mode. Then, proceed to step #18.

If it is determined in step #25 that the mode is not S mode, the mode is M mode. In this case, it is possible to change both the aperture value data and the exposure time data. After making changes, calculations for steady light photography in M mode and calculations for flash light photography in M mode are performed, and the process moves to step #18.

In step #18, the calculation of the exposure control data is completed, so it is possible to shift to the exposure control operation, and the 7-lag CCF is set to °1".Then, the terminal (itA), (
It is possible to perform an interrupt operation using an interrupt signal to the itB). Next, based on the data from the flash device ('F L ), it is determined whether or not a 7-flash device that is being powered is installed, and if there is no installation signal, bits MDR5 and MDR6 of register MDR are set to 00''. Proceed to step #35. When there is a mounting signal, a dimming operation completion signal (
It is determined whether the FDC signal (hereinafter referred to as FDC signal) is being input, and if the FDC signal is being input, bits MDR5 and MDR6 of register MDR are set to '°11' and the process moves to step #35. If the FDC signal is not input, it is next determined whether the charge completion signal is input, and if the charge completion signal is input, the MDRs 5 and 6 are set to "
10゛, if it is not input, press ゛゛0101.

In step #35, the terminal (09) is set to “l)l i
8hII and 7 runciu devices (F, L) from the camera below.
) data is transferred. In step #36, a pulse with a width of 400 μsec is output to the terminal (08).

Next, set the ISO data set in the register SVR to the human output register IOR, and then transfer the contents to the D
- Output from the analog signal output terminal (ANO) via the A converter. Subsequently, by performing serial input/output operation, I
Send SO data to flash device.

Next, the aperture value data for flash photography is set.
The contents of the register AVR2 are set in the register ①OR and sent to the 7-lash device, and the contents of the register TVR2, in which exposure time data for flash photography is set, are set in the register IO'R and sent to the flash device. Next, among the data from the lens (LE), the contents of the register LDRf, in which the focal length data is set, are set in the register IOR and sent to the 7-lanche device, and the terminal (09)
The above is the data transfer operation to the 7 lash device. Based on these data, the 7 lash device performs operations such as displaying the interlocking range and automatically setting the irradiation angle.

Next, in step #40, it is determined whether the 7-lag ISF is "1". If "i", it means that the Is○ switch is closed, and the step is #43.

move to On the other hand, if "()", then in step #-11 it is determined whether the 7 lag ○RF or "1".

If it is 1, it means that the overwrite switch (OR3) is closed, and the process moves to step #44.

On the other hand, in the case of "°0", the register MOR's pin) M
Determine the content of OR2, and if it is "0", the film counter switch (SFC) is closed and the film counter is 1.
This means that the position has not been reached (the film frame position that can be photographed), and the process moves to step #52. At step #42, bit MOR2 of register MC)R becomes “11”.
'', and if it is determined that the film counter switch (SFC) is open, the process proceeds to step #46, where the exposure control value is displayed. “00゛, MDRl
and set MDR4 to “1”. As a result, if no override is performed, the +/- symbols are not displayed, and furthermore, the F and SS symbols are displayed on the display device LDP.

Next, it is determined whether or not a charge completion signal has been input, and if the charge completion signal has been input from the 7 lash device (' F L ) to the microcontroller (MCB), the exposure time for flash photography (register TVR2) is determined. ) and aperture value (
The contents of the register AVR2) are sent in series to the display unit (DPC), and if the charging completion signal is not input, the exposure time for ambient light photography (the contents of the register TVR1) and the aperture value (
The contents of the register AvR1) are sent in series to the display unit (DPC), and the process moves to step #49 in FIG. 11-4.

#40's X Ten 7't'ISO Sui y+ (I SSh!
If it is determined that I' is closed, the process moves to step #43.

When moving to step #43, only the terminal (02) is set to “H”.
igI+”, press the up switch (
It is determined whether the UPS) is closed or not. Then, if the up switch (U, PS) is closed, the next step #
The decimal part of the ISO data manually set in 51 is 17
4. And if it is 1/4 then it is 1/2.
If it is not 1/4, add 1/4 and add the data to register 5.
Set to VR2. Therefore, the decimal part is 1/4.1
/4 oak 3/4. ' 3/4 becomes o. That is, as mentioned above, 1/3=1/4.2/3=3/4.0=
(). Then, it is determined whether the contents of register 5VR2 are larger than the maximum ISO data Svm,
If it is larger than Svm, Svm is set in the register 5vR2, and if it is not larger, it is left as is and the process moves to step #52.

If it is determined in step #50 that the up switch (UPS) is not closed, steps #53 and #54
Proceed to #55 and set only terminal (03) to 'Higb'.
It is determined whether the down switch (DO8) is closed. When the down switch (DOS) is closed, the decimal part of the manually set data becomes 3.
If it is /4, subtract 1/2, and if it is not 3/4, subtract 1/4. That is, 3/4 becomes 1/4, 1/4 becomes 0, O
Then make it 3/4. Then, it is determined whether the content of the register SVR is smaller than the minimum ISO data Svo, and if it is smaller, Svo is set to 5VR2, and if it is smaller, it is left as is and the process moves to step #52.

Further, if it is determined in step #55 that the down switch (DO8) is not closed, the process moves to step #52, leaving the contents of the register SVR as is.

In step #52, the flag DCF2 is set to "1", the bit MDRO is set to "1", and the bit MDRI is set to "1".

Set MDR4 and MDR7 to "O1", set the contents of register SVR to register IOR, and set terminal (030) to "
I-1i Hh'' to perform serial input/output operation.

This will cause the newly set ISO data to be transferred to the circuit (
The data is fixedly stored in a storage register (LAC) (FIG. 5) in the CIM. Next, send the ISO data and the data to turn off the aperture value display section to the display circuit (DPC) and press #49.
Move to the next step.

If it is determined in step #41 that the 7-lag ORF is 1 and the overwrite switch (ORS > is closed), the process moves to step #44. That is, in step #57, first, It determines whether the amplifier switch (UPS) is closed and the up switch (UPS) is closed.
S) is closed, MDR2 and MDR3 are set to °“01
” and adds 172 to the contents of register 0RRI.

Then, it is determined whether the contents of register 0RRI exceed the maximum value 0DI11, and if it does, OD m
Set it in register 0RRI, and if it does not exceed it, leave it as is and set the 7-lag DCF to 1 in step #58 in #60
Move to the next step.

If it is determined in step #57 that the up switch (UPS) is not closed, step #61
Then, it is determined whether only the terminal (03) is set to "High". and down switch (DO8)
If it is closed, add 1/2 to the contents of register 0RR2, if it exceeds the maximum value OD m, set 0DIll to register OR, R2, if it does not exceed it, leave it as is and set flag DCF2 to “1”. Set "" and move on to step #60.

If the down switch (DO3) is not closed at step #62, MDR2, MDR3, register 0
RR1 and 2 are left as they are, 7-lag DCF2 is set to 1, and the process moves to step #60 in FIG. 11-4.

In step #60, bit MDR2 of register MDR
, 'MDR3 determines whether it is '°00', and if it is '00', it is set to '11' for display.
, MDR+', M'DR4, and MDR7 are set to "0".

Therefore, in this case, the symbol is the override +
Only the /- symbol will be displayed.

Next, register the blank data (BLD) (■OR)
and further sends it to the display unit (DPC) so that the ISO or SS numerical display unit is turned off, and then the MDR
2. If the content of MDR3 is 01”, it is on the + side, so register 0
If the RRI is not "01", it sends the contents of register 0RR2 to the display unit (DPC) and moves to step #49. Next, in step #49, the contents of the register MDR are sent to the display unit (DPC), and the terminal (Oll) is set to "'
HigI+” to enable display by the light emitting diode (FLD) of the display unit (DPC).

Next, flag DCF1. One of DCF2 is “
If it is 111 II, the data has been changed. In this case, in order to prevent the data from being changed at high speed, wait for one stroke time and press #65. Move to the next step. On the other hand, if the flags DCFI, DCF2 are both “0”, #
Proceed to step 65.

In step #65, terminals (02), (03), (
04) as “High”, (il), (i2), (
i3) is "High", that is, whether at least one key switch is closed. If any one of them is closed, set the data for 5 seconds to the internal counter ICO and press the main switch (
BMS) is closed.

And if the main switch (BMS) is closed,
Let (02) and (04) be 11 L olIII+,
Determine whether the switch (IsS) is closed. And if (ISS) is closed, 7 lag IS
Set F to '1', oRF and LMF to '0', and return to step #14. Also, if (ISS) is not closed, it is determined whether the switch (ORS) is closed, and if the switch (ORS) is closed, ORF is set to "11", LMF and ISF are set to "0", and #14 is set. Return to step. Switch (IS
S).

If both (ORS) are open, set the 7-lag LMF to 1 and return to step #14. Therefore, the exposure time and aperture value are displayed for 5 seconds with no switch closed.

If all the key switches are not closed, it is determined whether the internal counter I'CO is set to II OII, and if it is set to 0, the process moves to step #67. If not, it is determined whether the reset switch (S4) is closed, and if it is not closed, the state of the main switch (BMS) is determined, and the process returns to steps #66 to #14.

5 seconds have passed since all key switches were released, or
When the reset switch (S4) is closed or the main switch (BMS) is opened, the process moves to step #67 and the terminals (01), (05) to (018) are connected to t.
i 1- oII +++ and flags CCF, LMF,
ISF.

Set ORF to °゛0゛ and interrupt terminal (itA) + (itB
), the display is turned off in the same way as the operation from step #3 in FIG.

When the calculation of the exposure control value is completed and the release switch (S2) is closed while the 7-lag CCF is "1", the terminal (i
tA) is accepted, and the process moves to step #70. In step #70, the terminal (09) is set to “Hi”.
gh” and outputs a pulse with a width of 50 μsec from the terminal (08) to read data from the flash device.

Then, it is determined whether or not a charge completion signal has been input, and if it has been input, the contents of the register PVR2 in which the aperture level value for flash photography is set is sent to the aperture control circuit (APC), and a charge completion signal is sent. is input, the contents of the register pVR1 in which the aperture step value for constant light photography is set is sent to the aperture control circuit (AP'C). Next, it is determined again whether a charge completion signal is input, and if it is input, the register TVR2 sets the exposure time for flash photography, and if it is not input, the exposure time for ambient light photography is set. The exposure time control circuit (TIC
).

Next, by setting the terminal (09) to "IHi81.I+" and sending a 150 μsec width pulse from the terminal (G8) to the flash device (PL), the flash device determines that the exposure control operation has started. (011) is set to L0W to turn off the light emitting diode (FLD) and prevent the intervening light display from being performed during exposure control.Next, a pulse is output from the terminal (012) and the release circuit (R
LC) to perform a shutter release operation and start an exposure control operation. Then, when the exposure control operation is completed and the opening of the shutter is completed,
Wait for 4) to be closed, and then close (G4).
Set terminals (02), (0:3), (04) to “High”
”, the process moves to step #67, performs the same operation as described above, and enters the HALT state.

FIG. 12 shows a specific example of the display circuit shown in FIG. 4.

When the terminal (CDP) becomes "High", the terminal (report 1) is input every 8 synchronization clock pulses (SCP).

A latch pulse is output from the launch control circuit (LAC) to (Kichi 2) and (Kichi 3). The data read into the serial input register (SIR) is then read into the serial input register (R
EGI), (REG2), and (REG3). Therefore, the register (REGI) contains the exposure time or IS.
O numerical data, (REG2) the aperture value or override numerical data, (R, EG3) display mode data, that is, the contents of the register MDR in the microcontroller (MCB) are set, and the terminals (eO) to ( The output of el) corresponds to bits MDRO to MDR7 of register MDR.

The decoder (DEI) converts the output of the register (REGI) into a value for displaying exposure time, and (DE2) converts it into a value for displaying ISO data. Then, the data selector (D
SL) sends out data from the decoder (DPI) if the terminal (el) is "l-1i gI+", that is, exposure time display mode, and sends data from the decoder (DE2) if it is "Loud", that is, ISO display mode. Also, the decoder (
DE3) converts the output of the register (REG2) into a value for displaying the aperture value, and the decoder (DE4) converts it into a value for displaying override. Then, if the terminal (G4) is "Hi Hh", that is, the data selector (DS2) is in the aperture value display mode, the data from the decoder (DE3) is set to +1 L.
o11111 That is, if it is not the aperture value display mode, the data from the decoder (DE4) is output. Tecoder (
D E5) is the terminal (eo) of the register (REG3) -
This is a decoder that converts the data from (G4) into data for symbol display.

The timing signal output circuit (TIC) has 8 terminals (Jl).
1-17. , (, i2), and further sends a timing signal to the common signal output circuit (COD) and the segment signal output circuit (SED). The segment signal output circuit (SED) includes data selectors (DSL>, (DS2), decoder (DE5)
) A display signal based on the data from is output, and a liquid crystal display is performed. Also, if the terminal (el) of the register (REG3) is “Hilly”, the AND circuit (G1)
A 2Hz clock pulse is output from and the LCD display is 2H.
Blinks with z.

The signals from terminals (G5) and (eO) of the register (REG3) and the 8Hz and 2) 1z black pulses from (jl) and (+2) are sent to the drive circuit (LDC) and output to the terminal (DPE). If it is "High", a drive signal corresponding to the flash state is output to the terminal (FLD).

FIG. 13 shows a specific example of the display in the embodiment of the invention. FIG. 13(a) is an example of the display state when setting the exposure time.
000 seconds is displayed, and at the same time, the aperture value F5.6 is displayed on the second display section. - Figure 13 (b) is an example of the display state when setting the film sensitivity, and the first display section shows the film sensitivity l5O40.
0 is displayed, and nothing is displayed on the second display section.

Modified example: In the case of a camera that is not equipped with a bank amplifier memory and a bank amplifier battery for the memory, data is only read from the film container when the battery is installed, and the presence or absence of data is determined. If there is no data, then it is determined whether or not film is installed.If film is installed, fixed data is memorized, a warning is displayed for a certain period of time and the release is locked, and the release lock and warning are released using the ISO data. Perform the setting operation. On the other hand, if there is no data and no film is loaded, fixed data is stored and the release lock is not performed with just a warning.

Further, if data is present, this data may be stored, warning and release lock may not be performed, and ISO data may be displayed. In this case, it is only necessary to eliminate the operations (steps) related to the backup memory in FIG.

Furthermore, although the presence or absence of film attachment is determined by a switch linked to the film counter, a switch that directly detects attachment of a film container or a switch that detects the film itself may be provided.

0...conducting portion Since the data of the film container is automatically read into the memory whenever the battery is replaced, the problem of loss of stored data when replacing the battery is basically solved.

Furthermore, as a countermeasure for the case where data is not provided on the film container, in this case, the fixed data is first automatically screened, and the user is notified of this by an alarm means and a means for prohibiting transition to exposure control operation. Therefore, from this point of view as well, it is possible to reduce the probability that data settings will be incorrect when replacing the battery. In addition, when the user determines that the fixed data is inappropriate due to the above notification and manually corrects the data setting, the above notification operation is canceled, so there is no inconvenience in use.

On the other hand, when the film container is not set when replacing the power supply battery, transition to the exposure control operation is not prohibited, so that unnecessary prohibition control can be prevented.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the external appearance of a camera to which this invention is applied, Fig. 2 is a view showing the inside of the camera shown in Fig. 1, and Fig. 3 is a film counter, counter switch, back cover, and back cover opening/closing. FIG. 4 is a plan view showing the relationship with the detection switch; FIG. 4 is a block diagram showing an embodiment of the camera system to which the present invention is applied;
FIG. 5 is a block diagram showing the main parts of the camera system shown in FIG. 4, FIG. 12 is a block diagram showing another embodiment; 13(a)
, (b) is a diagram showing an example of a display on a display device. 1... Camera body, 14... Film container, A
T2~A1'6. COT,...FT8. FT9/contact piece, CA D...Film container code pattern output circuit, B A 13...Power battery, 5FC(32)/
...Counter inch, MCB...Microcomputer.

Claims (1)

[Claims] (1) In a camera that reads data provided on a film container with a reading means and performs exposure control based on the data under the control of a control device, when a power battery is installed in the camera, the reading means reading means for reading data from the reading means into the control device; determining means for determining whether data is provided on the film container based on the data from the reading means; and determining means for determining whether data is provided on the film container based on the data from the reading means. When the determining means makes a determination, the data from the reading means is stored, and when the determining means determines that the data on the film container is not provided,
means for storing fixed data; means for issuing a warning when determining that data on the film container is not provided; and exposure control operation when the determining means determines that data is not provided. means to prohibit the transition to;
A means for canceling the operation of the prohibition means and the warning means in response to manual operation of setting data in the storage means, a means for detecting whether or not a film is attached, and a means for detecting whether or not a film is attached when the detection means detects that no film is attached. A camera characterized by comprising: means for disabling the operation of the inhibiting means.