JPH04180041A - Shutter operation warning device for camera - Google Patents

Abstract

PURPOSE:To recognize the cause of the inoperation of a shutter by judging that the inoperation of the shutter is caused by the defective operation of the shutter, malfunction or the lowering of a battery voltage based on the existence of the output of a shutter operation signal. CONSTITUTION:A shutter operation detection means which detects the operation of the shutter and outputs a signal and a source voltage warning means which detects the battery voltage when the operation signal is not inputted within a prescribed time and issues a warning are provided. When a control signal from a CPU 20 is an L level, a transistor Tr1 is turned on and a reference voltage and the voltage of a main battery E1 are compared. When the battery voltage is checked by a prescribed step, first and a release button is turned on in the case of a prescribed value or more, the operation signal of a shutter blade is judged based on the operation of the shutter. When the operation signal is not outputted, the warning that the operation of the shutter is defective is issued and the battery voltage is checked again. In the case of the prescribed value or more, the warning is issued by judging whether the inoperation of the shutter is caused by the stop of the shutter blade by the malfunction or the lowering of the battery voltage. Thus, the cause at the inoperation time of the shutter is recognized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera shutter operation warning device that determines the cause of shutter inoperation.

[Prior Art] Some camera shutter drive devices drive shutter blades using, for example, a shutter motor, and this shutter motor is given a drive t#i by a battery. If the voltage of the battery, which is the drive power source for the shutter motor, is low, the shutter blades may not be driven or the driving speed of the shutter blades may fluctuate, resulting in improper exposure.

For this reason, for example, some devices rotate the shutter motor in reverse or apply a load other than the shutter motor to check the voltage of the battery before driving the shutter blades.

[Problem B to be solved by the invention] However, the battery that powers the shutter motor also serves as the drive power source for the film motor, strobe, control circuit, etc., and it is not possible to operate the shutter by simply checking the voltage of the battery before driving the shutter blades. It is not accurate as a voltage check for driving.

In addition to the effects of battery voltage drop, the shutter blades may not be driven or the speed of the shutter blades may fluctuate, which may prevent proper exposure. Is this due to a drop in battery voltage?
It is not possible to determine whether the mechanism that drives the shutter blade is malfunctioning.

The present invention solves this problem and improves it, and aims to provide a camera shutter operation warning device that has a simple structure and can recognize the cause of the shutter flap operation.

[Means for Solving the Problems] In order to solve the above problems, a camera shutter operation warning device of the present invention includes a shutter drive means for driving a shutter blade, a power source for supplying electric power to the shutter drive means, and a shutter operation warning device for a camera according to the present invention. a shutter operation detection means that detects the operation of the shutter blade and outputs a shutter operation signal, and detects the voltage of the power supply and warns when the shutter operation signal is not manually applied within a predetermined time after starting the operation of the shutter blade. It is characterized by having a power supply voltage detection circuit.

[Operations] This invention includes a power source that supplies power to a shutter drive means for driving the shutter blades, and the shutter blades are driven by the shutter drive means. If the shutter activation signal is not input manually within a predetermined time after the shutter blade starts driving, the voltage of the power supply is detected and the shutter blade is malfunctioning due to a malfunction or a voltage drop in the power supply. to judge.

[Five Skills] Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

1 to 7 show a camera to which the present invention is applied, in which FIG. 1 is a front view of the camera, FIG. 2 is a right side view of the same, and FIG.
4 is a top view of the same, FIG. 5 is a bottom view of the same, FIG. 6 is a rear view of the same, and FIG. 7 is a plan view of the liquid crystal display section.

The camera body camera has a main body 1, a back M2, and a battery M3, and the back M2 and battery M3 are attached to the main body 1 so as to be openable and closable. The back cover 2 is opened by operating the back cover release button 4 in the direction of the arrow a, and the battery M3 is opened by operating the battery M3 in the direction of the arrow. A lithium main battery is housed in the battery cover 3 of the main body 1, and the main body 1 is also provided with an auxiliary battery that serves as a backup power source for displaying on a liquid crystal display and storing information related to photography.

A strap attachment part 5 is provided on the right side of the camera body 1, and a tripod attachment part 6 is provided on the bottom of the body 1.

A grip convex portion 1a is formed on the front right side of the camera body 1, and a grip concave portion 2a is formed on the upper right side of the back cover 2, making it easier to grip the camera during photographing. Furthermore, a film confirmation window 7 is formed on the back M2, so that the film in the cartridge chamber can be directly confirmed visually.

This camera is based on Japanese Patent Application Laid-open No. 1-21, which the same applicant previously applied for.
A known film feeding mechanism as shown in FIG. 4 of No. 7441 is provided, and the film is automatically wound up and rewound. In addition, when the back N2 is opened, a film is set in the main body 1, and the back M2 is closed, and the release button s1 is pressed, autoloading is performed and, for example, four sheets are fed, and the film returns to the initial state. Further, by pressing the rear button S2, it is possible to rewind the film halfway.

A photographic lens 8 is provided in the center of the main body 1, and this photographic lens 8 is covered with a barrier 9 to protect the photographic lens 8. The barrier 9 opens when the barrier button S4 is moved in the direction of arrow C, and when the barrier button S4 is closed, a release button is pressed.This camera is equipped with a shutter drive device and a shutter operation warning device, and the shutter is A behind-the-scenes shutter is used, and a DC motor is used as a drive source for the shutter motor.

A release button s1, a rear focus button S2, a selfie button 53, and a liquid crystal display section 1 are provided on the top of the main body 1.

As shown in FIG. 7, the liquid crystal display section 11 has a film counter 1!0, a battery display 111, a self display 112,
A strobe display 113 is provided. The film counter 110 adds a count value when loading a film and performs a photographing operation by operating the release button s1, and subtracts the count value when rewinding the film. When the main battery runs out, the central portion 111a of the battery display I'I1 turns off, and the battery display only shows the outer shape. Self display 112 is self button S
When 3 is pressed, the self display 112 lights up to indicate that the self mode has been selected. Strobe display 113
The central part will not be displayed while the strobe is charging, and the central part will be displayed once charging is complete.

On the front side of the camera body 1, there is a metering window 12 located above the photographic lens 8, a finder 13, and a selfie LED l4.
has been installed. This finder 13 is an Arvada light frame see-through finder, and the main body 1
An eyepiece 15 of a finder 13 is provided on the back side of the camera. Further, a strobe window 16 is provided on the left side of the camera body 1, and this strobe window 16 is arranged vertically so that it can be used for taking pictures.

By separating the lens from the camera lens 8, the strobe light is kept from having a negative effect on photography.

Camera control circuit FIG. 8 is a control circuit diagram of a camera to which the present invention is applied, FIG. 9 is a detailed diagram of a battery voltage check circuit, and FIG. 10 is a detailed diagram of a film motor driver circuit.

The control circuit of this camera includes a CPU 20, a drive circuit unit 21, a strobe circuit 22, and a liquid crystal display section 1. CPLI20 has main battery E1 to tie auto D1.
The CPU 20 is supplied with an auxiliary power source through a diode D2 and an auxiliary battery E2 connected in parallel. A drive voltage is directly applied to the drive circuit unit 21 and the strobe circuit 22 from the main battery E1. The CPU 20 drives the liquid crystal display section 1 and also drives the drive circuit unit 21 and strobe circuit 22.

Connected to the CPU 20 are a release button S1, a rewind button S2, a selfie button S3, a valahotan S4, a synchro switch S5, a camera back switch S6, and a film transfer detection switch S7.

The drive circuit unit 21 includes a battery voltage check circuit 210.
．． It has a photometric circuit 211 and a driver circuit 212. The voltage check circuit 210 operates and outputs a control signal from the output terminal CPU-CTL of the CPU 20, and this output is manually input to the input terminal cPLl-BC of the CPU 20, and this input Check the battery voltage at the terminal. When a film is set in the photometric circuit 211, film information is input from the terminal DX, and photometric information is also input from the photometric element CdS, and this film information and photometric information are input to the input terminal CPU-CD5 of the CPU 20. The exposure amount is set based on this information, and the aperture is changed using this information. moreover,
The driver circuit 212 connects the cPU20 output terminal CPU-LE
D, CPCI-FMI, CPU-FM2. CPLI-3
Based on control signals from M and CPU-AM, the film motor FM, shutter motor SM, aperture magnet AM, and self-timer LED are driven. Furthermore, CPU20
(7) The strobe circuit 22 is activated by the trigger signal from the output terminal CPU-TRG to emit strobe light, and the output terminal CP
The strobe capacitor is charged in the strobe circuit 22 by the charge signal from the U-CHG, and the strobe circuit 2
When a charging completion signal from 2 is input to the input terminal CPU-FIL, strobe charging is stopped.

The battery voltage check circuit 210 of the drive circuit unit 21 is constructed as shown in FIG.

A transistor T is connected to the input terminal MB connected to the main battery E1.
ri is connected to the input terminal CTL connected to the CPU20 connected to the base of this transistor Tr1.
A control signal is input from 20. The output of the transistor Tri is voltage-divided by resistors R1 and R2, and is applied to the inverting input terminal of the operational amplifier OP, and a reference voltage is applied to the non-inverting input terminal of the operational amplifier OP. An inverter N is connected to the output terminal of the operational amplifier OP, a base of a transistor Tr2 is connected to this inverter N, and an output terminal BC connected to this transistor Tr2.
is connected to the input terminal cpIJ-BC of the CPU 20.

Therefore, when the control signal from the CPU 20 is at L level, the transistor Tri is ONL, current flows from the input terminal MB to the resistor R1 and the resistor R2 via the transistor Tri, and the voltage divided between the resistor R1 and the resistor R2 is Occur. Apply power to the inverting input terminal of the operational amplifier oP. The operational amplifier OP compares the reference voltage value input to the non-inverting input terminal with the voltage value input to the inverting input terminal, and if the voltage at the inverting input terminal is higher than the voltage at the non-inverting input terminal, the output of the operational amplifier OP becomes low. become the level. This operational amplifier O
With the output of P, the output of inverter N becomes H level, transistor Tr2 is turned on, output terminal BC becomes L level, and it is determined that the voltage of main battery E1 is higher than a predetermined value.

On the other hand, the voltage value input to the inverting input terminal of operational amplifier OP is the value pJ input to the non-inverting input terminal of operational amplifier OP.
When the pressure is lower than the t pressure value, the output of the operational amplifier oP becomes H level. The output of the operational amplifier OP brings the output of the inverter N to the L level, turns off the transistor Tr2, and determines that the output terminal BC is at the H level and the voltage of the main battery E1 is below a predetermined value. In this way, when it is determined that the voltage of the main battery El is below a predetermined value, the central portion 111a of the battery display 111 of the liquid crystal display section 11 is turned off to notify 1i.

The film motor driver circuit is constructed as shown in FIG.

The film motor driver circuit includes a decoder 213 connected to the CPU 20 and a rotation control circuit 214 that controls the rotation of the film motor FM, and a drive voltage is applied to each circuit.

Input terminal FMS of decoder 213, FM2 has CPU2
Control signals from output terminals FMI and FM2 of 0 are input manually. The rotation control circuit 214 also includes h transistors Tr7 to
TrlO, diodes D3-D6 and resistors R7-RIO
It consists of

Therefore, the input terminals FM1 . FM2 is H
When the level is reached, terminals C1 and C3 are at H level, and terminal C4 is at H level.
, C6 are at L level, terminals C2 and C5 are undefined, and transistors Tr8. TrlQ,Tr
7. Tr9 is turned OFF and the film starter FM does not rotate.

Further, when the input terminal FMI of the decoder 213 becomes L level and the input terminal FM2 becomes H level, the terminals C1 and C
4, C5 is at H level, terminals C2, C3, and C6 are at L level, and transistors Tr8. T
r9 is ONL, transistor Tr7. TrlO is OFF
, and the film motor FM rotates forward.

Further, when the input terminal FM1 of the decoder 213 becomes H level and the input terminal FM2 becomes L level, terminals C2 and C
3, C6 becomes H level, and terminals C1, C4, C5 become L level, transistors Tr7. T
rio is turned on, and transistor Tr8. Tr9 is OFF
, and the film motor FM reverses.

Also, the input terminal FMj FM2 of the decoder 213 is L.
When the level is reached, terminals C2 and C5 are at H level, and terminal C1
, C3, C4, and C6 become L level, and the rotation control circuit 2
14 transistors Tr8゜TrlO+! +) ONL,
Transistor Tr7. Tr9 is turned OFF and a brake is applied to the film motor FM.

Shutter driving device FIGS. 11 to 14 show the shutter driving device.
1 is a front view of the shutter driving device, FIG. 12 is a plan view of the shutter driving device, FIG. 13 is a schematic perspective view of the shutter driving device, and FIG. 14 is an operation time chart of the shutter driving device.

A front plate 30 is attached to the camera body 1, and this front plate 3
An open fixed aperture 31 is opened in front of the lens 0 in alignment with the optical axis of the photographing lens 8. A shutter blade 32 is provided on the front plate 30.
The aperture blades 33 and 33 are rotatably supported by support shafts 34 and 35, respectively. The shutter blade 32 is urged by a shutter spring 36 so as to come into pressure contact with a stopper pin 37, and closes the open fixed aperture 31 when not photographing.

This shutter blade 32 is driven to open by the operation of a shutter release member 39 provided on the shutter lever 38, and at the position where the opening fixed aperture 31 is opened, the contact piece 32a of the shutter blade 32 contacts the contact piece 40 of the synchro switch S5. let me,
A synchronization signal is sent to the CPU 20 of the camera control circuit. This synchro switch S5 constitutes shutter operation detection means, and the synchro signal is transmitted to the shutter blade 3.
It is also used as a shutter operation signal to detect the operation of No. 2. The shutter lever 38 has elongated holes 38a formed in two places, and the shutter lever 38 is inserted through the elongated holes 38a and guided by a support pin 41 fixed to the front plate 30, so that it can reciprocate in the left and right direction. It has become. A shutter release member 39 provided on the shutter lever 38 is attached to the support shaft 4.
2 as a fulcrum, and a coil spring 43 is attached to this support shaft 42. One end portion 43a of this coil spring 43 is connected to the stopper portion 39 of the shutter release member 39.
a, and the other end 43b is locked to the stopper part 38b of the shutter lever 38, and the shutter release member 39 is always urged by this coil spring 43 so as to come into contact with the stopper l13sb of the shutter lever 38. There is. The shutter lever 38 is urged toward the shutter lever cam 45 by a shutter lever spring 44 attached to the front plate 30, and the end 38d of the shutter lever 38 comes into contact with the shutter lever cam 45.

The aperture blade 33 has a fixed diameter 46 for a small aperture,
This aperture blade 33 is connected to a locking portion 48a of an aperture lever 48 by an aperture spring 47.
3, the operating part 33a is always set to the stopper WJ of the throttle lever 48.
It is biased in the direction of contacting 48b. Aperture lever 48
Elongated holes 48c are formed at two locations in the elongated holes 48c.
A support pin 41 that supports the shutter lever 38 is inserted through the shaft 8c, and similarly to the shutter lever 38, the support pin 41 supports the shutter lever 8c so as to be able to reciprocate in the left-right direction. This aperture lever 48 is urged in the direction of the aperture lever cam 50 by an aperture lever spring 49 attached to the front plate 30, and the actuating part 33a of the aperture blade 33 is pushed by the stopper part 48b of this aperture spring 48.
The diaphragm blades 33 are now in contact with the stopper pin 51 provided on the front plate 30, and their position is regulated. The aperture blade 33 is provided with a magnetic contact piece 52, and when the aperture blade 33 rotates, the small aperture fixed aperture diameter 46 is positioned on the optical axis of the photographing lens 8, and the aperture is opposed to the magnetic contact piece 52. A magnet 53 is provided. When the aperture magnet 53 is energized by the driving of the drive circuit unit 21 controlled by the control circuit, the magnet contact piece 52 provided on the aperture blade 33 is attracted, and this causes the fixed aperture diameter 46 for small aperture of the aperture blade 33 to be attracted. The exposure amount is set with .

The shutter lever cam 45 and the aperture lever cam 50 are integrally formed, and the cam surface 45 of the shutter lever cam 45
a is longer than the cam surface 50a of the cam 50 for the aperture lever, and the cam 45 for the shutter lever and the cam 50 for the aperture lever are integrally provided on a cam gear 54 having the same rotation axis. The cam surface 45a of the shutter lever cam 45 contacts the end 38d of the shutter lever 38 to cause it to reciprocate, and the cam surface 5 of the aperture lever cam 50
0a contacts the end 48d of the aperture lever 48 and causes it to reciprocate. The cam gear 54 is connected to the shutter motor SM via gear means of an intermediate gear 55, and the shutter motor S
A DC motor is used for M, and the shutter lever cam 45 and the aperture lever cam 50 are rotated substantially in the same direction by driving the drive circuit unit 21 of the control circuit.

Next, the shutter drive device of this camera is operated at the 14th
The explanation will be based on the operation time chart shown in the figure.

When the release button S1 is pressed, the exposure amount is measured by the photometry circuit 211, and at the timing when this measurement ends, if the exposure amount is greater than a predetermined value, the aperture magnet 53 is energized to drive the aperture blades 33. , the aperture magnet 53 is not energized unless it is below a predetermined value.

Further, the shutter motor SM is driven at the timing when the measurement of the exposure amount is completed, and the rotational force of the shutter motor SM is transmitted to the cam gear 54 via the intermediate gear 55. When the cam gear 54 rotates counterclockwise, the shutter lever cam 45 pushes the shutter lever 38 in the forward direction, and the aperture lever cam 50 similarly rotates counterclockwise to move the aperture lever 48 in the forward direction. Push.

With this movement of the shutter lever 38, the shutter release member 39
When the cam piece 39a of the shutter blade 320 contacts the cam surface 32c of the actuating part 32b and the shutter lever 38 moves further, the shutter release member 39 rotates counterclockwise against the spring 43 and escapes from the actuating part 32b. After overcoming this, the shutter is charged.

Similarly to the movement of the shutter lever 38, the aperture lever 48
moves, and this movement of the aperture lever 48 causes the aperture blades 33 to move.
is pulled by the aperture spring 47 and rotated counterclockwise, so that the small aperture 46 of the aperture blade 33 is located on the optical axis of the photographing lens 8, and the magnetic contact piece 5 of the aperture blade 33 is rotated counterclockwise.
2 moves to the position of the aperture magnet 53.

Since the cam surface 50a of the aperture lever cam 50 is formed to be shorter than the shutter lever cam 45, the end 48d of the aperture lever 48 comes off from the aperture lever cam 50 first due to the rotation of the cam gear 54. Aperture magnet 5
3 is not driven, the aperture lever spring 49 moves in the backward direction and returns to the initial position. At this time, when the aperture magnet 53 is driven, the aperture blades 33 are held by the strong force of the aperture magnet 53, and the small aperture fixed aperture diameter 46 is located on the optical axis of the photographic lens 8.

When the cam gear 54 rotates further, the shutter lever 38
The end portion 38d is the cam surface 45 of the shutter lever cam 45.
a, the shutter lever 38 is moved in the backward direction by the shutter lever spring 44 and returned to the initial position. At this time, in order to push the shutter release member 39 provided on the shutter lever 38 or the operating portion 32b of the shutter blade 32, the shutter blade 32 rotates clockwise to open the fixed opening diameter 31, and the shutter release member 39 When the actuating portion 32b of the shutter blade 32 comes off, the shutter spring 36 rotates the shutter blade 32 counterclockwise to return to the initial position.

When the shutter blade 32 is driven to open, if the aperture blade 33 is driven, the aperture waveform will be as shown by a solid line, and if the aperture blade 33 is not driven, the aperture waveform will be as shown by a dotted line.

When the shutter blade 32 operates, the synchro switch ST is activated and a synchro signal is output, and the control circuit performs strobe light emission. Further, when this synchronization signal is output, it is manually inputted to the control circuit as a shutter operation signal for the shutter blade 32, and the drive of the shutter motor SM is stopped. Further, in this control circuit, when the shutter motor SM is driven and the shutter operation signal is not output, the voltage of the power source of the main battery E1 is detected.

In this way, the shutter driving means of the shutter motor SM rotates in one direction under the control of the control circuit, and the cam gear 54 rotates with the rotational force in this one direction, and the shutter lever cam 45 rotates.
The shutter lever 38 is moved in the forward direction to perform shutter charging, and further, the shutter lever 38 is removed from the shutter lever cam 45 at a predetermined rotational position to perform shutter driving, and when this shutter driving is completed, The shutter motor SM is driven or stopped under the control of the control circuit. The stop position of this shutter motor SM is cam gear 5.
4 is a shutter lever cam 45 and an aperture lever cam 5
0, the end 38d of the shutter lever 38 and the end 48d of the aperture lever 48 are removed, and the shutter lever 38
The initial positions of the end 38d and the aperture lever 48 can be easily managed as long as the end 48d is not pushed by the shutter lever cam 45 and the aperture lever cam 50.

Further, since the shutter motor driver circuit that drives the shutter motor SM only controls ON and OFF of the shutter motor SM, the circuit configuration becomes extremely simple.

Furthermore, the power transmission means operated by the shutter motor SM only rotates the shutter lever cam 45 and the aperture lever cam 50 in one direction and does not rotate in the opposite direction, so the structure is simple and there is no malfunction. can reduce the occurrence of

In addition, since the shutter lever 38 and the aperture lever 48 actuate the shutter blades 32 and the aperture blades 33 by simply reciprocating linearly, the structure is simple and malfunctions can be reduced, reducing the cost of the device. operation, and the reliability of operation is improved.

Camera shutter operation warning device The camera shutter operation warning device uses a shutter motor SM as a shutter drive means for driving the shutter blades 32.
a battery as a power source for supplying power to the shutter motor SM; a shutter operation detection means for detecting the operation of the shutter blade 32 and outputting a shutter operation signal; It has a voltage detection circuit within which the shutter activation signal is not inputted and which detects the voltage of the protection battery and gives a warning.

The operation of this camera shutter operation warning device will be explained based on the flowchart of FIG. 15.

In step a, the battery voltage is checked, and if the battery voltage is below a predetermined value, the liquid crystal display section 11 displays a power check. Ln is displayed (step b), and when the battery voltage is equal to or higher than a predetermined value, the presence of a battery is displayed on the liquid crystal display section 11 (step C).
). Then, the state of the barrier 9 is determined (step d), and if the barrier 9 is closed, the process moves to step a, and if the barrier 9 is open, the state of the release button S1 is determined. (step e). When the release button S1 is OFF, the battery voltage is checked (step f), and when the battery voltage is below a predetermined value, the process goes to step b, and when the battery voltage is above the predetermined value, the barrier 9 is checked. A state determination is made (step g);
If the barrier 9 is closed, proceed to step a; if the barrier 9 is open, proceed to step e.

In this step e, if the release button S1 is ON, the shutter is not operated (step h), and the output of the shutter operation signal of the shutter blade is determined based on the shutter operation by the shutter motor SM (step l), the shutter operation signal When is output, the film is wound (step J).

If the shutter operation signal is not output, the entire liquid crystal display section 11 flashes to display a warning of shutter operation failure (step k), and the battery voltage is checked again (step fl). If the battery voltage is below a predetermined value, the process moves to step b; if the battery voltage is above a predetermined value, the process moves to step b, and it is determined whether the shutter blade has stopped due to a malfunction or a drop in the battery voltage. and warn you.

Film Feeding Device of Camera The film feeding device of the camera includes an autorot means, a judgment means for determining whether or not the autorot is completed, and a storage means for storing manual rewind enable information or manual rewind enable information. Manual rewind that allows the operation of the manual rewind means if the information stored in the storage means is manual rewindable information, and prohibits the operation of the manual rewind means if the information stored in the storage means is information that cannot be manually rewinded. and a means for storing manual rewind impossible information in the Z self-memory means before starting the autorotation, and when the determination means determines that the autorotation has been completed, the manual rewinding information stored in the storage means is manually rewinded. It is designed to switch to possible information.

The operation of the film feeding device of this camera will be explained based on the flowchart shown in FIG.

Disable the rewind flag F (R) by inserting a power battery into the camera. Step a): Detect the state of the 8M switch S6, film counter information, and release button S1, and determine the conditions for starting film autorotation. (step b), and when the conditions for starting autorotation are met, the back cover switch S6 is in the closed state, the film counter information is "0", and the release button S1 is turned on, autorotation of the film is performed ( Step C).In step d, if autorotation is not performed within a predetermined time, the process moves to step b, and if autorotation is performed normally, the rewind flag F (R) is enabled and step b (Step e).

In step b, if the autorotation start condition is not met, it is determined whether manual rewind is to be performed (step f). In the case of manual rewind, the rewind flag F (R) is determined (step g), and if the rewind flag F (R) is yes, manual rewind is performed (step h), and the rewind flag F is determined.
(R) is disabled (step 1), and the process moves to step b.

In step g, if the rewind flag F(R) is not possible, the process moves to step j.

Further, in step f, if it is not manual rewind, the state of the release button S1 is determined in step j, and if the release button S1 is OFF, the process moves to step b, and if it is ON, shooting is performed. (
Step k), winding the film (step ℃
). When winding of the film is completed, the process moves to step b, and when the film becomes taut, the process moves to step h (step m).

In this flowchart, for example, when a film is loaded in the camera, the back cover 2 is closed, and the release button S1 is pressed, the film is automatically loaded (step b).
c). If this autorotation is not carried out normally, the process moves from step d to step b, and steps b~
Step d is looped to prohibit the manual rewind operation and prevent the leading end of the film from being inadvertently wound up by the user's operation.

Also, if you open the camera back carelessly when taking a picture and close the camera back again, the conditions for starting autoload are established and autoload starts, and if tension is detected during autoload, the autoload has already been completed. Since the rewind flag F (R) is enabled, the flow of steps b, f, and g is passed, and the manual rewind operation is permitted in step h. After kneading and rewinding the film using a manual rewind operation, the back cover 2 can be opened to take out the film after the film has been displayed.

[Effects of the Invention] As described above, in the present invention, power is supplied from the power source to the shutter driving means, the shutter driving means drives the shutter blade, and after starting the driving of the shutter blade,
If a shutter activation signal is not input within a predetermined time, the power supply voltage is detected and a warning is issued, allowing you to determine whether the shutter blade is malfunctioning due to a malfunction or a drop in power supply voltage. .

Therefore, there is an effect that the voltage of the power supply can be safely used up to its limit without having to set the voltage check level of the power supply high.

[Brief explanation of the drawing]

1 to 7 show a camera to which the present invention is applied; FIG. 1 is a front view of the camera, FIG. 2 is a right side view of the same, and FIG.
4 is a top view of the same, FIG. 5 is a bottom view of the same, FIG. 6 is a rear view of the same, FIG. 7 is a plan view of the liquid crystal display section, and FIG. Control circuit diagram of camera, No. 9
The figure shows a detailed diagram of the battery voltage check circuit, FIG. 10 shows a detailed diagram of the film motor driver circuit, FIGS. 11 to 14 show the shutter drive device, FIG. 11 is a front view of the shutter drive device, and FIG. 13 is a schematic perspective view of the shutter driving device, FIG. 14 is an operation time chart of the shutter driving device, and FIG. 15 is a flowchart showing the operation of the sick operation warning device of this camera. FIG. 16 is a flowchart showing the operation of the film feeding device of this camera. Code 1 is the main body, 2 is the camera back, Sl is the release button, S2
is a rewind button, S3 is a self-winding button, S4 is a barahotan, S5 is a synchro switch, 11 is a liquid crystal display, 20 is a CPLI, El is a piezoelectric battery, E2 is an auxiliary battery, 2
1 is a drive circuit unit, 22 is a strobe circuit, 210 is a battery voltage check circuit, 211 is a photometric circuit, 212 is a driver circuit, FM is a film motor, SM is a shutter motor, 31 is an open fixed aperture, 32 is a shutter blade, 3
3 is an aperture blade, 38 is a shutter lever, 44 is a shutter lever spring, 45 is a shutter release R cam, 48 is an aperture lever 50, a cam for a comparison lever, 54 is a cam gear, and 55 is an intermediate gear.

Claims (1)

[Claims] a shutter drive means for driving a shutter blade; a power source for supplying power to the shutter drive means; a shutter operation detection means for detecting the operation of the shutter blade and outputting a shutter operation signal; and a shutter operation detection means for starting the operation of the shutter blade. 1. A camera shutter operation warning device comprising: a power supply voltage detection circuit that detects the voltage of the power supply and warns when the shutter operation signal is not input within a predetermined time after the shutter operation signal is input.