JPH02199434A - Power unit for camera - Google Patents

Abstract

PURPOSE:To obtain a power unit that the actuation of a camera is guaranteed even when the loads of respective power sources are changed by connecting the main power source, the imprinting power source and the constant-voltage power source to the power source supply terminal of a control circuit respectively through counter-flow preventing elements in parallel. CONSTITUTION:A sub-CPU 202 is driven through the power units of a back-up circuit 215 and a reset circuit 216. The main power source Vb by a lithium battery 8, the imprinting power source and the constant-voltage power source Vdd by a coin battery 9 are respectively connected through diodes D1 - D3 for preventing counter-flow and they are connected to the power source supply terminal of the CPU 202 through resistance R in parallel, besides. Therefore, when photometry and range-finding, stroboscope or the like is driven by the control of a main CPU 201 and the voltage of the power source Vb is lowered, the power source is supplied from the imprinting power source and the power source Vdd. Besides, when the voltage of the imprinting power source is lowered, the power source is supplied from the power sources Vb and Vdd. Moreover, even when the loads of the power source Vb and the imprinting power source are suddently changed, it is suppressed by the other power source that the supply voltage of the CPU 202 is suddenly changed and the actuation of the camera is guaranteed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a power supply device for a camera that has a simple structure and ensures camera operation.

[Prior Art] A camera is equipped with a control circuit that controls the operation of the camera and an imprinting means that imprints photographing-related information onto the film, and the control circuit records photographic information such as photometry and distance measurement results when in storage mode. There is a camera that stores memory and controls operations such as photometry, distance measurement, and extension of the photographic lens when in the control mode, and also uses a recording means to record information such as the date of photography on the film.

The storage mode and control mode of this control circuit are driven by the main power supply, and a dedicated backup power supply is provided to back up the main power supply. Further, the printing means is equipped with a dedicated printing power source, and irradiates light from the back side of the transmissive liquid crystal element to print information such as the date onto the film.

[Problems to be Solved by the Invention] In general cameras, batteries are used as the main power source, backup power source, and photo power source, but providing a camera with such a large number of batteries takes up space. They are difficult to secure, become an obstacle to weight reduction, and require the user to manage a large number of batteries, which is inconvenient.

The imprint power source is mainly used for imprinting, and is normally used to drive a liquid crystal element for displaying the date, etc. If it were possible to back up the main power supply with this printing power supply, there would be no need for a dedicated backup battery, but in this case, when driving the printing means to print on the film, there would be sudden load fluctuations in the printing power supply. Furthermore, there are sudden load fluctuations in the main power supply due to the drive of the control circuit, and these load fluctuations may have a negative effect on the operation of each circuit.

The present invention has been made in view of the above points, and an object of the present invention is to provide a power supply device for a camera that backs up a main power supply with a photographic power supply and can guarantee operation of the camera even if there are load fluctuations on each power supply. It is an object.

[Means for Solving the Problems] In order to solve the above problems, the camera power supply device of the present invention has a storage mode for storing and retaining information related to photography;
In a camera having a control circuit including a control circuit for controlling the operation of the camera, and an imprinting means for imprinting photographing-related information onto a film, a main power source for the control circuit, an imprinting power source for the imprinting means, a constant voltage power supply connected to the main power supply and driven in a state where the control circuit is in a control mode; and supplying power to the control circuit from the main power supply, the imaging power supply, and the constant voltage power supply through a backflow prevention element, respectively. It is characterized by being connected in parallel to the terminals. Note that the photographing-related information includes not only information necessary for photographing operation and control of the camera, but also all character information such as date and location.

[Function] In the camera power supply device of the present invention, the main power supply is backed up by the photography power supply, and a power supply battery dedicated to backing up the main power supply is not required, making it easy to secure the installation space and reducing the weight. . In addition, since the main power supply, photopower supply, and constant voltage power supply are each connected in parallel to the power supply terminal of the control circuit via a backflow prevention element, sudden load fluctuations may occur on the main power supply and photopower supply, respectively. The camera is guaranteed to operate from either power source, even if the power source is present.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

1 to 8 show a camera to which the present invention is applied; FIG. 1 is a front view of the camera, FIG. 2 is a rear view of the camera, FIG. 3 is a plan view, and FIG. IV-■ Cross-sectional view, Figure 5 shows the viewfinder display, Figure 6 shows the display on the back cover, Figure 7 is a cross-sectional view of the back cover and main body, and Figure 8 shows the printed wiring on the back cover. FIG. 3 is a diagram showing a state in which the board is attached.

Composition of the camera body As shown in FIG. 4, the camera includes a main body 10, a front cover 20,
It is composed of a decorative panel 30 and a back cover 40, and a front cover 2
A decorative panel 30 is engaged with the front side of the front cover 2.
0 is engaged and screwed so as to cover the main body 10. The back cover 40 and the battery cover 41 are integrally assembled to a bearing portion 42a of a main body mounting body 42 via a hinge shaft 43, and the main body mounting body 42 is engaged with the main body 10 and further fixed with screws. .

The main body 10 is formed with an unexposed film storage chamber 14 and an exposed film storage chamber 15 with an image frame section 13 in between. The cartridge 1 is stored in the unexposed film storage chamber 14 and the exposed film F is wound up on a reel 16 provided in the exposure film storage chamber 15.

A front base plate 17 is provided in the center of the main body 10, and a lens barrel frame 2 equipped with a photographing lens 5o is mounted on this front base plate 17.
2 is integrally provided with the lens barrel 51 and is movable in the optical axis direction,
It is designed to collapse.

Further, a release button 2, a close-up button 3, and a main switch button 4 are provided on the upper surface of the front cover 20.

Photographing lens The photographing lens 50 is composed of four lenses in four groups, and is attached to the lens barrel frame 22 via supports 52 and 53, and the lens barrel frame 22 is attached to the lens barrel 51. This photographic lens 50 uses a between-inquive lens in which a shutter 54 is disposed between the lenses.

The finder mechanism uses an Arvada type bright frame see-through finder.This finder 60
is provided with displays as shown in Fig. 5, including shooting range frames 61, 62, AF frame 63, rough distance measurement completion (lit) and distance warning (blinking) displays 64, and close-up mode (lit). A display 65, a grit mark 66, etc. are provided.

During photographing, the focus adjustment mechanism changes the distance between the photographic lens 50 and the film surface according to the distance to the object, and adjusts the focus so that the image of the object is correctly focused on the film surface. As a distance measuring mechanism for this focus adjustment, a light emitting AF lens 70 and a light receiving AF lens 71 are provided on the upper part of the front base plate 17, and are covered with AF windows 72 and 73 of the decorative panel 30. distance is used. A lens barrel 51 holding a photographic lens 50 is extended by the drive of a motor 170, and the lens group is driven straight to perform focus adjustment. The lens barrel 51 has a photographing window 55 on the front side, and this photographing window 55 is covered with a lens barrier 140 to protect the photographing lens 50 inside.

The shutter mechanism has the function of providing the necessary amount of exposure to the film over time, and also the function of blocking unnecessary light outside of the exposure time. A shutter motor 80 is driven to open and close the shutter 54, which is a program shutter and further uses a self-timer.

The self-timer operates when the mode switching button S31 (described later) is operated to set the self-timer mode and the release button 2 is pressed.
When 0 seconds have elapsed, the shutter 54 opens and closes. While the self-timer is operating, the self-timer display light emitting diode 5LE214 lights up for about 7 seconds and then blinks for about 3 seconds. When the opening/closing operation of the shutter 54 is completed, the self-timer mode is automatically canceled and the automatic strobe light emission mode is restored. If you want to cancel the self-timer mode while the self-timer is operating, you can press the main switch button 4.

Good Side ■ World 11 In order to give the film the proper exposure, it measures the brightness of the light on the subject side that falls on the screen and adjusts the amount of exposure. A Cd5 (cadmium sulfide) light receiving element 90 is used as a light receiving element that converts an electrical signal according to the amount of incident light. This light receiving element 90 is connected to the front base plate 17.
and is covered with the AE light receiving window 91 of the decorative panel 30.

A flash tube 100 of a one-piece strobe mechanism is fixed above the unexposed film chamber 14 of the main body 10, and is covered by a window 101 of a decorative panel 30. In the automatic light emission mode, the light is automatically emitted when the brightness is low, and the capacitor 7 of the charging circuit is always automatically rechargeable and is disposed close to the exposed film storage chamber 15 of the main body 10.

Film Winding Structure The film winding mechanism uses an automatic winding system using a motor 110 and is driven via a winding unit 111. The auto-loading film rewinding mechanism starts when the release button 2 is pressed after closing the back cover 40.The film rewinding mechanism automatically rewinds the film when the last frame has been photographed, and then automatically rewinds the film when the rewinding is completed. Stop. For rewinding, the film counter is decremented and the film feed mark is displayed in the opposite direction.

On the back M40 is a control display section 12 for auto date and shooting information.
0 is provided through the back cover base plate 44, and a film confirmation window 6 is further formed. Further, the LCD decorative plate 130 of the camera back 40 includes a date display section 121 and a shooting information display section 12.
2 is provided. Furthermore, mode switching button S81
There are provided a date mode switching button SS2, a correction point selection button SS3 for selecting a correction point for year, month, date, and time, and an addition button SS4 for adding up the date display.

The back cover 40 is equipped with an imprinting means 123 for imprinting information such as the date onto the film, and when the imprinting means 123 is driven, light is irradiated onto the transmissive liquid crystal 303 from the back side, and the photographing date and other information is imprinted on the film. Imprint.

As shown in FIG. 8, the date imprinting section 123 consists of an imprinting light source section 300, an optical path 301, a reflecting mirror 302, and a date imprinting LCD 303.
303 is a date circuit board 3 via a conductive rubber (not shown).
05 and is electrically connected to it. Integrated circuit 3 of date display section 121 and date imprint section 123
06 is connected to the date circuit board 305. The shooting information display section 122 has a shooting information display LCD 309 on the back cover 40.
, and both ends thereof are connected to the back cover base plate 44 via a flexible printed wiring board 204 using conductive rubber (not shown).
The photographing information display L CD 309 is electrically connected to the flexible printed wiring board 204 using conductive rubber.

As shown in FIG. 4, a 3V lithium battery 8 serving as a main power source is housed in the battery compartment 18 of the main body 10, and can be replaced by the user by opening and closing a battery cover 41.

Further, one 3cm coin battery 9, which is a power source for driving the photographing means, is provided in a battery storage chamber 45 of the back cover 40, and this coin battery 9 also functions as a backup power source for the main power source.

As shown in FIGS. 7 and 8, the battery storage section 45 has a rear M
A coin-shaped coin battery 9 is stored in the battery storage part 45, and the coin battery 9 is connected to the coin battery 9 by a flexible printed wiring board 204.
A date circuit board 305 and a shooting information display LCD 309 are connected, and the coin battery 9 drives these and also functions as a backup power source for the main power source disposed on the camera body side as described above.

The flexible printed wiring board 204 has a positive contact 204a and a negative contact 204 connected to the coin battery 9.
b is integrally formed, and a connecting part 204c connected to the date circuit board 305, a connecting part 204d connected to the photographing information display LCD 309, and a connecting part 204e connected to the main control part arranged in the main body 10 are each integrally formed. It is formed. The flexible printed wiring board 204 bends the connecting portion 204f of the positive contact 204a to face the negative contact 204b, and connects both contacts 204a, 2
A coin battery 9 is inserted between the terminals 04b and connected to the respective electrodes. This flexible printed wiring board 20
4 is fixed to the back plate 40 by inserting the pin 310 formed in the back plate 40 through the hole 204g, and is assembled so that the rubber member 312 is sandwiched between the connecting part 204f.
C is connected to the date circuit board 305, and the connecting portion 2.4d is connected to the photographing information display LCD 309 for assembly.

The coin battery 9 stored in the battery storage section 45 is inserted into the battery cover 20.
When the lid is closed at step 7, the flexible printed wiring board 204
The positive contact 204a and the negative contact 204b are pressed into contact with the electrodes of the coin battery 9, and the battery lid 207 is closed, thereby electrically connecting. Therefore, the connection can be made easily and reliably.

Auto Date As an auto date, a digital clock with a liquid crystal display is built into the control display section 120, and the date display section 121 provided on the LCD section decoration plate 130 on the 4° back cover displays "year, month, day,"
"Month/Day/Year", "Day/Month/Year", "Date/Hour/Minute" or "rOFF mode" are displayed, and the above-mentioned date mode switching button SS2 and correction location selection button SS3 for selecting the correction location for the year, month, date, and hour are displayed. , is adjusted by operating the addition button SS4 for adding the date display.

The photographing information display section 122 of the photographing information display back cover 40 includes a battery remaining amount display 122a and a film counter 12, as shown in FIG.
2b and a film feed indicator 122C.

In addition, a strobe charging mode 122d, a self-timer mode 122e, an automatic flash mode 122f, a forced flash mode 122g, and a non-flash mode 122h are switched and displayed on the liquid crystal display.

Figure 9 is a schematic circuit block diagram of a camera to which the present invention is applied.

This camera has MAINCPU201 and 5UBCPU2.
02 is used, information is exchanged alternately through the serial interface, and the 5LIBCPU 202 has the following information:
It has a storage mode for storing photographic information and a control mode for controlling camera operation.

The MAIN CPU 201 executes control sequences for drive systems that require large currents and camera shooting operations, and
PU202 is the shooting information display section 12 of the camera back unit 203.
2 and also sends switch information to the MAIN CPU 201.
, and causes the MAIN CPU 201 to perform various controls.

The DC-DC converter 204 has a main power source of 3
v A lithium battery 8 is connected, and this DC-DC converter 204 is a 5UBCPU 202 that starts when the main switch is turned on or the second release switch S2 is turned on.
It is activated by the power control. As a result, the voltage Vdd is applied to MAINCPU201km, and M
AINCPU 201 starts up. Voltage Vcc from DC-DC converter 204 is applied to release switches s1 and S2.
, power supply and voltage Vd of control switches other than the main switch, close-up switch, and mode selector switch
d is given as a power source for each CPU, the voltage vb of the lithium battery 8 is a power source for the 5UBC CPU 202 and the strobe unit, and the voltage b' of the lithium battery 8 is a power source for a drive system that requires a large current. Also strobe unit 2
05 contains a DC-DC converter separate from the DC-DC converter 204.
A DC converter is provided.

The activated MAIN CPU 201 contains analog information 2 including battery check information BC1, photometry information AV, temperature information TH for temperature compensation of the motor driver, and shutter trigger delay time information STD for correcting the shutter opening.
It is input as 06. This battery check information BC
The data is transferred to the 5UBCPU 202 via a serial interface, and the 5UBCPU 202 displays this information as a battery remaining amount display 122a. Furthermore, MAIN
Switch information 207 of the DX switch, lens position switch, and AFI-rega switch is input to the CPU 201 .

Further, distance measurement information is taken in from the AP unit 208 as an analog signal, and if the distance measurement result is within the shooting possible distance range according to the shooting mode selected at that time,
A with F white display control by MAINCPU201
The FLED is turned on, the CULED is turned on in the case of close-up shooting mode, and the LBLED is turned on when the subject brightness is below a predetermined value in the automatic flash mode, and these constitute the F circle display 209. Then, a distance measurement completion and distance warning display 64, a close-up mode display 65, and a blip mark 66 are displayed in the finder. In addition, the APLED blinks when the distance measurement result is outside the shooting distance range according to the shooting mode selected at that time, and the LBLED lights up when the forced flash mode is on, and when the subject brightness is set to a predetermined value in the non-flash mode. Flashes when the value is below.

When the second release switch S2 is turned on, the MAIN CPU 201 performs lens motor control to control the lens motor driver 210 based on distance measurement information.
The motor 170 is driven to extend the photographic lens 50 and stop it at a predetermined position. At this time, the position of the photographic lens 50 is controlled based on the trigger information of the AF trigger switch, which is output when the contact piece 175 comes into contact with the main body side contact 175e or 175g, and the motor rotation speed information from the photocoupler 173. Since the photographic lens 50 is extended according to the distance measurement information, the trigger information from the AFI-trigger switch determines the base position for counting the amount of extension of the photographic lens 50, Y3 or Y.
5 (depending on the selected shooting mode), and this count base point position Y3 or Y5
A control operation is performed in which the motor 170 is stopped when it has rotated a predetermined amount. Then, according to the photometric information AV, shutter motor control is performed to control the shutter motor driver 211, and the motor 80 is driven to operate the shutter 54 to provide exposure. At this time, the opening and closing of the shutter 54 is detected by the photocoupler 99.

When this exposure is completed, the lens motor driver 21
0 is controlled, and the photographic lens 50 is set to the initial position Y2 or Y.
4 (depending on the selected shooting mode),
Film motor control is performed to control the film motor driver 212, and the motor 110 is driven to wind the film. At this time, while reading the switch information from the perforation switch 213, it is checked whether the film has been wound by one frame.

The 5UBCPU 202 sends a charging signal to the strobe unit 205, and the strobe unit 205 sends a charge completion signal to the 5UBCPU 202, thus performing EF control between the two. Light emission control of the strobe unit 205 is performed by the MAIN CPU 201, and the flash tube 100 emits light. The self-timer display 5 LED 214 is controlled by the external display control of the 5UBCPU 202.

5UBCPIJ2Q2 is driven through the power supply devices of the backup circuit 215 and the reset circuit 216, and the main power supply vb from the lithium battery 8, the photo power supply from the coin battery 9, and the constant voltage power supply Vdd are connected to diodes D1 to D3, which are backflow prevention elements, respectively. further connected through a resistor R
It is connected in parallel to the power supply terminal of the 5UBCPU 202 which is a control circuit. Therefore, MAINCPU
When photometry, distance measurement, strobe, etc. are driven under the control of 201 and the voltage of the main power supply Vb decreases, power is supplied from the photographing power supply and the constant voltage power supply Vdd. Further, when the date module 218 is driven to imprint the shooting date on the film and the voltage of the imprinting power source decreases, the main power source V
Power is supplied from b and a constant voltage power supply Vdd. In this way, the main power source vb is backed up by the photo power source or the constant voltage power source Vdd, and a power source battery dedicated to backing up the main power source vb is not required, making it easy to secure the installation space and reducing the weight. In addition, the main power supply vb,
The imprint power source and the constant voltage power source Vdd are connected to the 5UBCPU 202 via diodes D1 to D3 that prevent reverse current, respectively.
Because they are connected in parallel to each other, even if there is a sudden load change on the main power supply Vb and the photo power supply, the power supply will not be affected by the other power supply or the constant voltage power supply Vdd, 5UBCPt+202
Sudden fluctuations in the power supply voltage are suppressed and operation is guaranteed.

Further, switch information 217 such as a release switch, main switch, close-up switch, and back cover switch is input to the 5UBCPU 202, and a date module 218 is provided to the back cover unit 203, and this date module 218 includes a date mode switch, a select switch, etc. , switch information 219 from the set switch is input, and an LCD drive is performed to output a liquid crystal display drive signal for date imprinting and date display. Also 5UBC
The PU 202 outputs a signal to drive the counter and other liquid crystal displays disposed on the back cover unit 203, and outputs a signal to drive the counter L.
A mode changeover switch 220 is also provided on the back cover unit 203 for driving a CD, and the mode can be changed by manual operation.

Figure 10 shows the operation sequence of the circuit block of the present invention, and the sequence of the MAIN CPU 201 and the 5U
It is divided into BCPU202 sequences.

The 5UBCPU 202 receives the IR by the reset signal ACL.
It is initialized by the subroutine, starts operating from the start, and monitors information input to the microcomputer from the MODE=1 determination. Then, when the 51=1 determination turns on the Lurys switch S1, a film autoload error is determined by the flag φAL=1 determination, and if the 51=1 determination indicates an autoload error, the ALS
The ub routine (2) displays an autoload error and ends. Also, the flag φREW-EN
If it is determined that D=1 and the film has finished rewinding, R
The process moves to the EWS u b routine (3), where the end of film rewinding is displayed, and even if the No. 1 Lurie switch S1 is ON, it will not operate unless the back cover is opened. Furthermore, if the flag Φ5TT=1 is determined and the shutter is abnormal, the process branches and does not accept the signal.

If these flags are not set, apply a power halt with PH←1 to start up the power, and then turn on the MAIN CPU.
Start 201. When the MAIN CPU 201 is started, the I10 port is set and the RAM is cleared using lloSET%RAMCLR, a battery check is performed using the BCSub routine, and DX switch information is roughly read using the DXSub routine.

Read each piece of information and use the serial interface on the SO to convert the battery check information, DX switch information, and test information into 5 bits of information.
Serially transferred to UBCPU202, BC display Sub
Display the remaining battery power in a routine. Here, if the remaining capacity of the battery 8 is less than a predetermined value, an error E is assumed and the operation is stopped.

If the remaining capacity of battery 8 exceeds a predetermined value, 5UB
So of CPU202, LD2 of MAINCPU201
In order to proceed to the Sub routine, information on the LD2Sub instruction is sent, and a branch 1 determination is made at the SI of the MAIN CPU 201. When the program moves to the LD2Sub routine, the lens position is checked and the collapsing stop position and the like are determined by flag φSEP.

In the LD2Sub routine, if the lens position is the initial position for normal shooting, the MAIN CPU 201
The process moves to branch 1 judgment. On the other hand, in the 5UBCPU 202, the lens position is the initial position for normal shooting, and the flag φ
If rewinding is completed with REW=1 judgment,
At SO, the REWSub instruction information is transferred to MAINCPυ201 and the process ends.

If 5b=o is determined and the camera back is open according to the camera back switch information, the flag ΦALB is determined to be 1, the process moves to the WSub routine and the SI branch 2 of the MAIN CPU 201 is determined.
Transfer W Sub instruction information. If flag ΦC; 0 is determined and the counter is zero, flag ΦDX is determined to be 1 to determine whether or not the loaded film is a DX film, and if it is a non-DX film, MA is set at SO.
The ALSub instruction information is transferred to the SI branch 2 judgment of the INCPU 201, the 5UBCPU 202 enters the autoload waiting state, and the MAIN CPU 201 executes the ALSub
The autoload operation is performed by the routine.

If the film is counted up, or if the counter is zero and it is a DX film, the information sent by B by the LD2Sub reach is judged, and the Φ5EP
When =11, the lens barrel 51 is at the initial position for normal photography or close-up photography, so photography is possible; when Φ5EP=OO, the lens barrel 51 is at the collapsing stop position, so the process ends and Φ5EP In the case of =01, the lens barrel 51 was extended but stopped at an undetermined position, so it is moved back and is at the retracted stop position, so the automatic light emission mode is returned to and the process ends.

When the lens barrel 51 is at the initial position for normal photography or close-up photography, the 51=1 determination turns OFF the Lullies switch S1.
If it is ON, charge the strobe main capacitor in the CHGSub routine, and if it is ON, set the flag ΦT.
If EST=1 is determined and the test mode is set, the test process is performed, and if it is not the test mode, the S
.

The data is transferred using the serial interface. here,
MainRout main routine instruction, flag φMO
The DE mode information and the counter information of the flag ΦC are 4-bit information and are transferred to the SI branch 2 determination of the MAIN CPU 201.

The 5UBCPU 202 is waiting in the AFSub routine, and the MAINCPU 201 makes a branch 2 judgment with SI, and when it moves to the AESub routine, it reads the photometry information, roughly reads the distance measurement information in the AFSub routine, and sends this distance measurement information to the 5UBCPU 202. AFSu
Transfer to routine b. This distance measurement information is R[AF] or R[CAFl, where R[AF] is RAM information for distance measurement in normal shooting mode, and R[CAFl is RAM information for distance measurement in close-up shooting mode, both of which are 4 bits. will be transferred twice.

The 5UBCPU 202 determines 52=1 and waits for the second release switch S2 to be turned on, and the MAINCPU 201 uses the FLEDSub routine to turn on the distance measurement AFLED, and in the case of close-up shooting mode, turns on the CULED. LBL when the subject brightness is lower than a predetermined value in lighting mode, automatic flash mode, or forced flash mode.
The ED lights up, and the APLED blinks if the distance measurement results are slower than the shooting distance range, or if they are continuous, and the L
The BLED is in a non-emission mode and blinks when the subject brightness is lower than a predetermined value.

When the second release switch S2 is turned ON by the 52=1 judgment of the 5UBCPU 202, the serial transfer port of Sin changes from the normal low state to the high state and the 5
Send in=1 information to MAINCPU201, 5UB
The CPU 202 waits 16m5 hours and sets Sin←0 to ensure that the FLEDSub routine of the MAI NCPU 201 shifts to SI, and then determines whether or not it is the self-timer mode by checking the flag ΦMODE.

If not in self-timer mode, R[ST
D] Transfer the information to MAIN CPU 201 in 8 bits. This STD information is 8-bit information of the shirt trigger relay time film, and after winding the film,
Information is exchanged in the Sub routine, and the information is sent to M.
Load it with AINCPU201's WSub routine, 5
This information is transferred to the UBCPU 202, and the 5UBCPU 202 stores this information.
I'm posting it to 1. For self-timer mode, 5E
Transfer R[STD] after moving to LFSub re-chin.

When this STD information is sent to MAINCPU201, S
After passing through I, the 5UBCPU 202 waits in the 5DSub routine, and the MAINCPU 201 changes the lighting time for imprinting, depending on whether the ISO zone is 4 or higher, and if it is 15O400 or higher, DATET←1. Then, DATEX←1 is set, and this signal is output for 5 ms as a signal for emitting light to imprint the date. When this signal is output, the light is emitted for about 10 ms and the date is imprinted.

When this is completed, initialize by setting DATEX←0 and DATET←0, and use the AFLDSub routine to initialize the shooting lens 5.
0 is fed out, and the shutter 54 is opened and closed in the 5DSub routine. If an activation signal for the shutter 54 is not received while the shutter 54 is opening or closing, a flag φSTT is output. If a failure occurs during the opening or closing process of the shutter, the flag φ5TT=
1, and this information is sent to the 5UBCPU 202 to determine if there is a problem.

If there is no abnormality, the flag φ5TT=O is sent, and MA
The INCPU 201 returns the photographing lens 50 in the LDRSub routine, moves to the Wsub routine, and winds the film.

The 5UBCPU 202 uses the flag ΦMODE to determine whether or not it is in the self-time mode, and if it is not in the self-time mode, it shifts to the film winding of the WSub routine. In the case of the self-timer mode, the mode display is set to automatic light emission mode, the flag φMODE is set to automatic light emission mode, and then the process moves to winding of the WSub reachin film.

The operating sequence as described above takes place, but with 5 UBC
In the PU 202, when the PU202 is activated from the start and before the Lurie's switch S1 is pressed, it is determined whether the mode switch is ON' or OFF in the MODE=1 determination, and if MODE is 1, that is, the mode switch is ON, the flag Φ5TT=
1 judgment is used to determine shutter trouble, and in the event of an abnormality, no further signals will be accepted. If it is normal, the mode display is changed, and the mode information is also changed with the flag ΦMODE, and the self-timer mode is determined with the flag φMODE, and if it is not the self-timer mode, the mode switch is released when MODE=O is determined. Wait for , and then return to the MODE=1 determination.

In the case of self-timer mode, set 1 to the timer with T←IS.
When the second is set and the mode switch is set to ON for 1 second when MODE=1 is determined, the feeding display is retracted when Tover is determined, and the self-display 0FFL/ and the rewind display are blinked. Then, in this blinking state, when the second release switch S2 is turned on with a judgment of 52=1, PH←1, Φ
As AL←0, start MAIN CPU201,
Restore the feeding display, set it to automatic light emission mode, set the feeding display to 0FFL/, display the battery tick in the BC display Sub routine, and MAI the REWSub instruction information in So.
The data is serially transferred to the NCPU 201, and the film is manually rewound midway through the REWSub routine.

Furthermore, if the second release switch S2 is not turned on, if the MODE=1 determination indicates that the mode switch is OFF, the rewind display is turned off, the feed display is roughly restored, and the automatic flash mode is displayed. , flag φMOD
Set E to automatic flash mode and exit. If it is determined that MODE=1 and the mode switch is ON, it waits for the second release switch S2 to turn ON.

Then, when the 5UBCPU 202 determines that 51=1 is OFF and the main switch is turned on and 5cn=1, collapsing switching is performed. Here, the collapsible barrel switching flag φScu is 0, and the PH
← Set it to 1 and start the MAIN CPU 201. Further, when the close-up switch is turned on and 5cu=1, close-up collapsing switching is performed and the collapsing switch flag is set to ΦS cu =1.

Flags ΦBC, ΦDX, ΦT from MAINCPU201
After receiving the EST information, display the battery check using the BC display subroutine, and display the LDIS using the serial output of SO.
ub instruction, flag ΦScu information is MAIN CPU201
will be forwarded to. These pieces of information are sent to the sr branch 1 judgment of the MAINCPU201, the lens barrel is driven in the LDISub routine, and the flag φSEP information is set to 5UBCPU2.
02, and in the LDI Sub routine, the lens position is determined from this flag ΦSEP information. Flag φ5
When EP=11, the lens barrel 51 is at the initial position for normal photography or close-up photography, and the strobe capacitor is charged in the CHGSub routine. Flag φ5EP=OO
In this case, the lens barrel 51 is at the collapsing stop position, and the flag Φ5EP=
In 01, the lens barrel 51 was extended but stopped at an undetermined position, so it was moved back to the retracted stop position, the normal shooting mode was selected, the automatic flash mode was displayed, and the flag φMOD was set.
Set E to automatic flash mode and exit.

The 5BSub routine of the 5UBCPU 202 checks the status of the camera back at 1 second intervals, and monitors whether the camera camera back is opened based on camera back switch information.

Next, the test mode will be explained. This test mode is for checking the camera's performance, and tests are performed using the counter display on the back cover. Flag φTES
When determining T=1, 5 LED←1 in test mode
By setting the test mode, the test mode is confirmed and four types of tests are performed: automatic flash mode, forced flash mode, non-flash mode, and self-timer mode. TESTI information is transferred in automatic flash mode, and the second Lurie's switch S1
When is ON, the zone information when metering is displayed, and when the second release switch S2 is turned ON, the shutter is released and the automatic exposure mechanism can be tested, and both metering information and exposure amount information are tested. .

TEST2 information is transferred in forced flash mode, and flashmatic is read from DX information. The DX information is displayed for each zone, and the aperture value can be controlled using Flashmatic according to the displayed information. In this test, the counter and feeding display are cleared and 5 LEDs are set to 0, and charging is performed using the CHGSub routine. In addition, the TEST3 information is transferred in the non-emission mode, the AF zone information is displayed with the first Lurie switch S1, and the second release switch S2 drives the lens and extends it to the AF information, which causes the shooting lens to move. You can know the movement stroke.

TEST4 information is transferred in the self-timer mode, and a test is performed to see if the shutter is open using the Lullies switch S1.

These mode tests can be canceled with the mode switch.

Furthermore, when the flag Φ5TT=1 in the 5UBCPU 202, the sequence of symbol C is entered, the transfer segment is evacuated, all segments are blinked for a predetermined period of time, and returned to lighting, and when 51=0 is determined, the No. 1 Lurie's switch S1 is activated. Wait for it to finish.

Also, in the above operation sequence, the sequence from symbol 1 turns off the power hold when PH←0, waits 200m5, and ends when 51=0 and MODE=0.5cn=0.5cu=O. In addition, the sequence from symbol E is entered due to battery abnormality, etc., and flag φBC← is used to protect the battery.
00, turn off the battery, and turn off the power hold in the same way as above.

[Effects of the Invention] As described above, in the camera power supply device of the present invention, the main power supply is backed up by the photography power supply, eliminating the need for a dedicated power supply battery for backing up the main power supply, and making it easy to secure the installation space. And it's also lighter. In addition, since the main power supply, photopower supply, and constant voltage power supply are each connected in parallel to the power supply terminal of the control circuit via a backflow prevention element, sudden load fluctuations may occur on the main power supply and photopower supply, respectively. Even if there is a power source, operation of the control circuit is ensured by either power source, and the structure is simple.

[Brief explanation of the drawing]

1 to 8 show a camera to which the present invention is applied; FIG. 1 is a front view of the camera, FIG. 2 is a rear view of the camera, FIG. 3 is a plan view, and FIG. ■-■ Cross-sectional view, Figure 5 shows the viewfinder display, Figure 6 shows the display on the back cover, Figure 7 is a cross-sectional view of the back cover and main body, and Figure 8 shows the printed wiring on the back cover. FIG. 9 is a schematic circuit block diagram of a camera to which the present invention is applied, and FIG. 10 is an operation sequence of the circuit block of the present invention. In the figure, reference numeral 8 is a lithium battery, 9 is a coin battery, 201 is a MAIN CPU, 202 is a 5UBCPU, 215 is a backup circuit, and 218 is a date module. Diagram

Claims (1)

[Claims] a control circuit having a storage mode for storing information related to photography and a control mode for controlling camera operation;
In a camera having an imprinting means for imprinting photographing-related information onto a film, the control circuit is connected to a main power source, the imprinting means is connected to a main power source, and the control circuit is in a control mode. A power supply device for a camera, comprising: a driven constant voltage power source, and the main power source, photography power source, and constant voltage power source are each connected in parallel to a power supply terminal of the control circuit via a backflow prevention element. .