JP2893295B2 - camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a camera capable of automatically loading a film.

[Prior art] Some cameras can auto-load film. In such a camera, for example, when the film is set in the camera and the back cover is closed, the take-up spool rotates to remove the film. A predetermined amount is auto-loaded so that shooting is possible.

Also, when the user accidentally opens the back cover during shooting and closes the back cover again, similarly, the film is auto-loaded by a predetermined amount and the exposed portion of the film is fed so that there is no shooting mistake. Is done.

[Problems to be Solved by the Invention] By the way, in the auto load, a winding member is provided with a friction member, and a film is wound by the frictional force, and a claw is provided on the winding reel, and the perforation of the film is hooked by the claw. There is a type that winds up the film, for example, setting the film on the camera and closing the back cover, or operating the relays button etc. after closing the back cover, the take-up spool rotates, and the claw of the film is In the case of the type that engages with the perforation at the leading end of the tape, the setting of the user's film is not appropriate, and the pawl of the take-up spool does not engage with the perforation, which may cause an auto load error. In this case, the back cover is opened and the film is properly set again. However, the user may erroneously press the rewind button, and the leading end of the film is caught in the cartridge and cannot be used.

For this reason, if a film autoload error occurs,
It is conceivable to prohibit rewinding of the film. However, during the shooting, when the user accidentally opens the back cover and closes the back cover again to auto-load a predetermined amount, the film may be stretched when there is no catching of the film or the remaining number of shots. . In this case, if rewinding of the film is prohibited, the film must be pulled out by hand, which may damage the film or damage each part of the camera.

The present invention solves this problem and improves it.When the film is set on the camera and the back cover is closed, the leading end of the film is prevented from being carelessly caught in the patrone due to an auto load mistake, It is an object of the present invention to provide a camera that facilitates operation when a film is stretched.

[Means for Solving the Problems] In order to solve the problems and achieve the object, the present invention is configured as follows.

The invention according to claim 1 is characterized in that "1. means for auto-loading the film, manual rewind means for rewinding the film according to the instruction of the operator, and prohibiting means for inhibiting the operation of the manual rewind means. Have
A camera characterized in that when the automatic loading by the first film feeding when the film is loaded is normally performed, the prohibition of the manual rewind means by the prohibiting means is released to enable the operation. ].

According to the first aspect of the present invention, after the film is set on the camera and the back cover is closed, the film is automatically loaded. When the automatic loading by the first film feeding when the film is loaded is performed normally, the operation prohibition of the manual rewinding means by the prohibiting means is released to enable the operation, and the automatic loading is not performed normally. The manual rewind operation at this time is prohibited, and careless winding of the leading end of the film by a user operation is prevented.

In addition, when the back cover is opened and closed again, the automatic loading is performed. At this time, when the tension is detected, the operation of the manual rewind is permitted because the automatic loading has already been performed. With this operation, the film is rewound to eliminate the tension of the film and enable the automatic loading again, or open the back cover and take out the film.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

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 left side view thereof, FIG. 3 is a right side view thereof, and FIG. FIG. 5, FIG. 5 is a bottom view, FIG. 6 is a rear view, and FIG. 7 is a plan view of a liquid crystal display unit.

Camera body The camera has a main body 1, a back cover 2, and a battery cover 3,
The back cover 2 and the battery cover 3 are attached to the main body 1 so as to be freely opened and closed. The back cover 2 is opened by operating the back cover release button 4 in the arrow direction a, and the battery cover 3 is opened by operating the back cover release button 4 in the arrow direction b. The main body 1 accommodates a lithium main battery in the battery cover 3, and the main body 1 is provided with an auxiliary battery serving as a backup power supply for storing liquid crystal display and photographing-related information.

A strap attachment portion 5 is provided at the right end of the camera body 1, and a tripod attachment portion 6 is provided at the bottom of the body 1.

A grip convex portion 1a is formed on the right front portion of the camera body 1, and a grip concave portion 2a is also formed on the upper right portion of the back cover 2, so that the camera can be easily gripped during photographing. Further, a film confirmation window 7 is formed in the back cover 2 so that the film in the patrone room can be directly visually confirmed.

This camera is disclosed in Japanese Patent Application Laid-open No. Hei 1-21 filed earlier by the applicant.
A known film feeding mechanism as shown in FIG. 4 of No. 7441 is provided to automatically wind and rewind the film. Also, when the back cover 2 is opened, a film is set on the main body 1 and the back cover 2 is closed, and when the release button S1 is pressed, automatic loading is performed and, for example, four frames are fed to be in an initial state. Also, the film can be rewound halfway by pressing the rewind button S2.

A photographic lens 8 is provided at the center of the main body 1, and the photographic lens 8 is covered with a barrier 9 to protect the photographic lens 8. The barrier 9 is opened when the barrier button S4 is moved in the direction of the arrow c. When the barrier 9 is closed, a relay lock is engaged.

This camera is provided with a shutter drive device and a shutter operation warning device, a single speed behind shutter is used as the shutter, and a DC motor is used as a drive source for driving the shutter.

Relays button S1 and rewind button on top of body 1
S2, a self button S3, and a liquid crystal display unit 11 are provided.

As shown in FIG. 7, the liquid crystal display section 11 is provided with a film counter 110, a battery display 111, a self display 112, and a strobe display 113. The film counter 110 adds a count value by a shooting operation by operating the release button S1 when loading a film, and decrements the count value when rewinding. When the main battery runs out, the battery indicator 111 shows the central part 111.
a turns off and the battery display shows only the external shape. When the self-button S3 is pressed, the self-display 112 lights up to indicate that the self-mode has been selected. The strobe display 113 does not display the center portion during charging of the strobe, but displays the center portion when charging is completed.

On the front side of the camera body 1, a photometric window 12, a viewfinder 13, and a self LED 14 are provided above the taking lens 8. As the finder 13, an Albada bright frame see-through finder is used, and an eyepiece 15 of the finder 13 is provided on the back side of the main body 1. In addition, a flash window 16 is provided on the left side of the camera body 1, and the flash window 16 is arranged vertically long so that the flash emission is not adversely affected by taking the flash window 16 away from the taking lens 8.

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 and a drive circuit unit 2.
1. It has a strobe circuit 22 and a liquid crystal display unit 11. CPU
A drive voltage is applied to 20 from a main battery E1 via a diode D1, and a diode D2 and an auxiliary battery E2 are connected in parallel to the CPU 20 to supply an auxiliary power supply. The drive circuit unit 21 and the flash circuit 22 are supplied with a drive voltage directly from the main battery E1. The liquid crystal display unit 11 is driven by the CPU 20, and the drive circuit unit 21 and the flash circuit 22
Is driven.

The CPU 20 has a relays button S1, a rewind button S2,
Self button S3, barrier button S4, synchro switch S
5. The back cover switch S6 and the film transfer detection switch S7 are connected.

The drive circuit unit 21 has a battery voltage check circuit 210, a photometric circuit 211, and a driver circuit 212. The battery voltage check circuit 210 operates while a control signal from the output terminal CPU-CTL of the CPU 20 is being input, and this output is output to the input terminal CPU-BC of the CPU 20, and the battery voltage is checked with this input voltage. Perform When a film is set in the photometric circuit 211, the film sensitivity information is input from the terminal DX, and the photometric information is input from the photometric element CdS.
Is input to the input terminal CPU-CDS, and the exposure amount is set from these information, and the aperture is changed with this. Further, the driver circuit 212 has output terminals CPU-LED, CPU-FM1, and CPU-
-Drive the film motor FM, shutter motor SM, aperture magnet AM and self-timer LED based on control signals from FM2, CPU-SM and CPU-AM. Further, the strobe circuit 22 is activated by a trigger signal from the output terminal CPU-TRG of the CPU 20 to emit a strobe light, and the strobe circuit 22 is charged by the strobe circuit 22 by the charge signal from the output terminal CPU-CHG. Charge completion signal from 22 is input terminal
When input to the CPU-FUL, strobe charging is stopped.

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

The transistor Tr1 is connected to the input terminal MB connected to the main battery E1.
Is connected, and a control signal is input from the CPU 20 to the input terminal CTL connected to the base of the transistor Tr1. The output of the transistor Tr1 is divided by the resistors R1 and R2, input to the inverting input terminal of the operational amplifier OP, and the reference voltage is input 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, and the base of the transistor Tr2 is connected to the inverter N. The output terminal BC connected to the transistor Tr2 is connected to the CPU.
Connected to 20 input terminals CPU-BC.

Therefore, when the control signal from the CPU 20 is at the L level, the transistor Tr1 is turned ON, and current flows from the input terminal MB to the resistors R1 and R2 via the transistor Tr1, and the resistor R1
A divided voltage is generated between 1 and the resistor R2, and the operational amplifier OP
Is output to the inverting input terminal. 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. If the voltage of the inverting input terminal is higher than the voltage of the non-inverting input terminal, the output of the operational amplifier OP becomes L. Become a level. With the output of the operational amplifier OP, the output of the inverter N goes high, the transistor Tr2 turns on, the output terminal BC goes low, and it is determined that the voltage of the main battery E1 is equal to or higher than a predetermined value.

On the other hand, when the voltage value input to the inverting input terminal of the operational amplifier OP is lower than the reference voltage value input to the non-inverting input terminal of the operational amplifier OP, the output of the operational amplifier OP becomes H level.
With the output of the operational amplifier OP, the output of the inverter N becomes L level, the transistor Tr2 is turned off, the output terminal BC is at H level, and it is determined that the voltage of the main battery E1 is lower than a predetermined value. As described above, when it is determined that the voltage of the main battery E1 is equal to or less than the predetermined value, the central portion 111a of the battery display 111 of the liquid crystal display unit 11 is turned off and a warning is issued.

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

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

Output terminal F of CPU20 is connected to input terminals FM1 and FM2 of decoder 213.
Control signals from M1 and FM2 are input. The rotation control circuit 214 includes transistors Tr7 to Tr10, diodes D3 to D6, and resistors R7 to R10.

Therefore, when the input terminals FM1 and FM2 of the decoder 213 become H level, the terminals C1 and C3 become H level, the terminals C4 and C6 become L level,
The terminals C2 and C5 become undefined, the transistors Tr8, Tr10, Tr7 and Tr9 of the rotation control circuit 214 are turned off, and the film motor FM does not rotate.

Also, the input terminal FM1 of the decoder 213 becomes L level,
When the input terminal FM2 goes high, the terminals C1, C4, and C5 go high and the terminals C2, C3, and C6 go low, and the rotation control circuit 21
4 transistors Tr8 and Tr9 turn ON, and transistors Tr7 and Tr10
Turns OFF, and the film motor FM rotates forward.

Also, the input terminal FM1 of the decoder 213 becomes H level,
When the input terminal FM2 goes low, the terminals C2, C3, C6 go high and the terminals C1, C4, C5 go low, and the rotation control circuit 21
4 transistors Tr7 and Tr10 turn on, and transistors Tr8 and Tr9
Turns off, and the film motor FM reverses.

When the input terminals FM1 and FM2 of the decoder 213 go low, the terminals C2 and C5 go high and the terminals C1, C3, C4 and C6 go low, and the transistors Tr8 and Tr10 of the rotation control circuit 214 turn off.
N, the transistors Tr7 and Tr9 are turned off, and the film motor FM is braked.

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

A front plate 30 is attached to the main body 1 of the camera.
A fixed aperture 31 that is in front of the lens and coincides with the optical axis of the taking lens 8
Is open. A shutter blade 32 and an aperture blade 33 are rotatably supported on the front plate 30 by support shafts 34 and 35, respectively. The shutter blade 3 is a stopper pin with a shutter spring 36.
Energized to press against 37
31 is to be closed. The shutter blade 32 is opened and driven by the operation of a shutter opening member 39 provided on a shutter lever 38, and at the position where the fixed aperture 31 is opened, the contact piece 32a of the shutter blade 32 is set to the contact piece 40 of the synchro switch S5.
To send a synchro signal to the CPU 20 of the camera control circuit. The sync switch S5 constitutes a shutter operation detecting means, and the sync signal is also used as a shutter operation signal for detecting the operation of the shutter blade 32. The shutter lever 38 has two long holes 38a formed therein. The shutter lever 38 is inserted into the long holes 38a and is guided by support pins 41 fixed to the front plate 30, so that the shutter lever 38 can reciprocate left and right. Has become. A shutter release member 39 provided on the shutter lever 38 is rotatably supported on a support shaft 42 as a fulcrum, and a coil spring 43 is mounted on the support shaft 42. One end 43a of the coil spring 43 is engaged with the stopper 39a of the shutter opening member 39, and the other end 43b is engaged with the stopper 38b of the shutter lever 38. Shutter lever
The stopper 38 is urged to abut against the stopper 38b.
The shutter lever 38 is urged toward a shutter lever cam 45 by a shutter lever spring 44 attached to the front plate 30,
The end 38d of the shutter lever 38 is a shutter lever cam 45.
Contacted.

The diaphragm blade 33 has a fixed aperture diameter 46 for a small diaphragm, and the diaphragm blade 33 is locked by a diaphragm spring 47 with a locking portion 48a of a diaphragm lever 48.
The operating portion 33a of the diaphragm blade 33 is
Is always urged in the direction in which it comes into contact with the stopper portion 48b of the aperture lever 48. The aperture lever 48 has two long holes 48c formed therein. A support pin 41 for supporting the shutter lever 38 is inserted into the long hole 48c, and the support pin 41 reciprocates in the left-right direction similarly to the shutter lever 38. Supported as possible.
The aperture lever 48 is an aperture lever spring 49 attached to the front plate 30.
To the direction of the aperture lever cam 50, and this aperture spring
The operating portion 33a of the diaphragm blade 33 is pushed by the stopper portion 48b of 48, whereby the diaphragm blade 33 comes into contact with a stopper pin 51 provided on the front plate 30 to regulate the position. The diaphragm blade 33 is provided with a magnet contact piece 52, and the diaphragm blade 33 is rotated so that the fixed aperture diameter 46 for the small aperture is located on the optical axis of the photographing lens 8 so as to correspond to the magnet contact piece 52. A magnet 53 is provided. When the aperture magnet 53 is energized by the drive of the control circuit unit 21 controlled by the control circuit, the magnet contact piece 52 provided on the aperture blade 33 is attracted, and thereby the small aperture fixed opening diameter 46 of the aperture blade 33 is adjusted. Sets the exposure amount.

The shutter lever cam 45 and the aperture lever cam 50 are integrally formed. The cam surface 45a of the shutter lever cam 45 is formed longer than the cam surface 50a of the aperture lever cam 50. Aperture lever cam
Numeral 50 is provided integrally with the 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 reciprocate, and the cam surface 50a of the aperture lever cam 50 contacts the end 48d of the aperture lever 48 to reciprocate. Let it. The cam gear 54 is connected to a shutter motor SM via gear means of an intermediate gear 55. A DC motor is used as the shutter motor SM, and the drive circuit unit 21 of the control circuit drives the cam 45 for the shutter lever and the cam for the aperture lever. The cam 50 is rotated substantially once in the same direction.

Next, the operation of the shutter drive device of this camera is described in the fourteenth.
A description will be given based on the operation time chart in FIG.

When the release button S1 is pressed, the exposure amount is measured by the photometry circuit 211.At the timing when this measurement is completed, if the exposure amount is equal to or more than a predetermined value, the aperture magnet 53 is energized to drive the aperture blade 33. If the value is less than the predetermined value, the aperture magnet 53 is not energized.

Further, the shutter motor SM is driven at the timing when the measurement of the exposure amount ends, 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.

By the movement of the shutter lever 38, the cam piece 39a of the shutter opening member 39 comes into contact with the cam surface 32c of the operating portion 32b of the shutter blade 32, and when the shutter lever 38 further moves, the shutter opening member 39 resists the spring 43. The shutter rotates in a counterclockwise direction and escapes to get over the operating portion 32b, and the shutter is charged.

The diaphragm lever 48 moves in the same manner as the movement of the shutter lever 38, and the diaphragm blade 33 is pulled by the diaphragm spring 47 by the movement of the diaphragm lever 48 and rotates counterclockwise. The aperture diameter 46 is located on the optical axis of the taking lens 8, and the magnet contact piece 52 of the diaphragm blade 33 moves to the position of the diaphragm magnet 53.

Since the cam surface 50a of the aperture lever cam 50 has a shorter cam surface 45a than the shutter lever cam 45, the rotation of the cam gear 54 causes the end 48d of the aperture lever 48 to first come off the aperture lever cam 50, When the aperture magnet 53 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 blade 33 is held by the attraction force of the aperture magnet 53, and the fixed aperture diameter 46 for the small aperture is located on the optical axis of the photographing lens 8.

When the cam gear 54 further rotates, the end 38d of the shutter lever 38 is disengaged from the cam surface 45a of the shutter lever cam 45, and the shutter lever 38 moves in the backward direction by the shutter lever spring 44 and returns to the initial position. At this time, since the shutter opening member 39 provided on the shutter lever 38 pushes the operating portion 32b of the shutter blade 32, the shutter blade 32 rotates clockwise to open the opening fixed opening diameter 31, and the shutter opening member 39 When the operating portion 32b of the shutter blade 32 comes off from the
The shutter blades 32 rotate counterclockwise by the shutter spring 36 and return to the initial position.

At the time of opening the shutter blade 32, the aperture waveform becomes as shown by a solid line when the aperture blade 33 is driven, and becomes an aperture waveform shown by a dotted line when the aperture blade 33 is not driven.

Then, when the synchro switch S5 is operated and a synchro signal is output by the operation of the shutter blade 32, the control circuit emits a strobe light. When the synchro signal is output, the synchro signal is input to the control circuit as a shutter operation signal of the shutter blade 32, and the driving of the shutter motor SM is stopped. Further, in this control circuit, the shutter motor SM is driven, and if this shutter operation signal is not output, the voltage of the power supply of the main battery E1 is detected.

As described above, 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 by the rotation force in this one direction, and the shutter lever 38 moves in the forward direction by the shutter lever cam 45. The shutter is moved and the shutter lever 38 is disengaged from the shutter lever cam 45 at a predetermined rotation position to perform shutter driving. When the shutter driving is completed, the shutter motor SM is controlled by the control circuit. Driving is stopped. The stop position of the shutter motor SM is such that the cam gear 54 is disengaged from the shutter lever cam 45 and the aperture lever cam 50 at the end 38d of the shutter lever 38 and the end 48d of the aperture lever 48, and moreover, at the end 38d of the shutter lever 38. The initial position of the aperture lever 48 may be any position as long as its end 48d is not pushed by the shutter lever cam 45 and the aperture lever cam 50, and the management of the initial position is simple.

Further, since the shutter motor driver circuit for driving the shutter motor SM only controls ON / OFF of the shutter motor SM, the circuit configuration becomes extremely simple.

Further, the power transmission means operated by the shutter motor SM includes a shutter lever cam 45 and an aperture lever cam.
The structure is simple and the occurrence of erroneous operation can be reduced because the structure 50 is rotated only in one direction and does not rotate in the opposite direction.

In addition, the shutter lever 38 and the aperture lever 48 only reciprocate linearly to operate the shutter blades 32 and the aperture blades 33, so that the structure is simple and malfunctions can be reduced, thereby reducing the cost of the apparatus. And operation reliability is improved.

Camera shutter operation warning device The camera shutter operation warning device includes a shutter motor SM as shutter driving means for driving the shutter blades 32.
A battery as a power supply for supplying power to the shutter motor SM, shutter operation detecting means for detecting the operation of the shutter blade 32 and outputting a shutter operation signal, and a predetermined time after the operation of the shutter blade 32 is started. A power supply voltage detection circuit for detecting a battery voltage and warning when the shutter operation signal is not input. The operation of the shutter operation warning device of the camera will be described with reference to the flowchart of FIG. In step a, a battery voltage check is performed. If the battery voltage is equal to or less than a predetermined value, an indication that the battery is empty is displayed on the liquid crystal display unit 11 (step b). An indication that the battery is present is displayed (step c). Then, the state of the barrier 9 is determined (step d). If the barrier 9 is closed, the process proceeds to step a. If the barrier 9 is open, the state of the release button S1 is determined. (Step e). If the release button S1 is OFF, a battery voltage check is performed (step f). If the battery voltage is equal to or lower than a predetermined value, the process proceeds to step b. If the battery voltage is equal to or higher than the predetermined value, the state of the barrier 9 is changed. The process is performed (step g). If the barrier 9 is closed, the process proceeds to step a. If the barrier 9 is open, the process proceeds to step e. If the release button S1 is ON in step e, the shutter operation is performed (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 i), and the shutter operation is performed. When the signal is output, the film is wound up (step j). If the shutter operation signal is not output, the entire liquid crystal display section 11 is blinked to display a warning of a shutter operation failure (step k), the battery voltage is checked again (step l), and the battery voltage is set to a predetermined value. When the battery voltage is equal to or less than the predetermined value, the process proceeds to step b. When the battery voltage is equal to or more than the predetermined value, the process proceeds to step k to determine whether the shutter blade stops due to malfunction or the cause due to the low battery voltage, and issues a warning.

Camera film feeder The camera film feeder includes an auto loading means,
Determining means for determining whether or not the autoloading has been completed;
Storage means for storing manual rewind impossible information or manual rewind possible information; and when the information stored in the storage means is manual rewindable information, the operation of the manual rewind means is permitted, and the information stored in the storage means is stored in the manual. In the case of non-rewind information, manual rewind means for prohibiting the operation of the manual rewind means is provided, and the manual rewind non-information is stored in the storage means based on the completion of the rewind, and the judgment means judges that the autoload is completed. Is adapted to switch the manual rewind impossible information stored in the storage means to the manual rewind possible information.

The operation of the film feeder of the camera will be described with reference to the flowchart of FIG.

The rewind flag F (R) is disabled by inserting a power battery into the camera (step a), the state of the back cover switch S6, the film counter information, and the release button S1.
Is detected and the auto-loading start condition is determined (step b). The auto-loading start condition is set, the back cover switch S6 is in the back cover closed state, the film counter information is “0”, and the relays button S1 is pressed. If it is turned on, the film is automatically loaded (step c). If it is determined in step d that the automatic loading is not performed within the predetermined time, the process proceeds to step b. If the automatic loading is normally performed, the rewind flag F (R) is set.
And the process proceeds to step b (step e).

In step b, if the condition is not the auto load start condition, it is determined whether or not it is a manual rewind (step f). In the case of manual rewind, the rewind flag F (R) is judged (step g).
If the rewind flag F (R) is enabled, a manual rewind is performed (step h), and the rewind flag F
Disable (R) (step i) and proceed to step b.

In step g, if the rewind flag F (R) is not possible, the process proceeds to step j. Step f
If the release button S1 is not in the manual rewind mode, the state of the release button S1 is determined in step j.
In the case of (1), photographing is performed (step k), and the film is wound up (step l). When the winding of the film is completed, the process proceeds to step b, and when the film is stretched, the process proceeds to step h (step m).

In this flowchart, for example, when the camera is set on a film, the back cover 2 is closed, and the release button S1 is pressed, the film is automatically loaded (step b, b).
c). If this auto-loading is not performed normally, the process moves from step d to step b, and
Even if a manual rewind operation is performed in step f after looping step j, the rewind operation is prohibited in step g, and careless winding of the leading end of the film by user operation is prevented.

In addition, when the back cover was opened carelessly during shooting, the auto load start condition was set again by closing the back cover and the auto load was started, and when the tension was detected during the auto load at that time, the auto load was already Since the rewinding is performed, the rewind flag F (R) is enabled, and the operation of manual rewinding is permitted in step h through the flow of steps b, f, and g. Thus, the film can be rewound by the manual rewind operation, and after the film display is completed, the back cover 2 can be opened to take out the film.

[Effect of the Invention] As described above, according to the first aspect of the present invention, after the film is set in the camera and the back cover is closed, the film is automatically loaded, and the first film supply when the film is loaded is performed. If the automatic loading by feeding is normally performed, the operation prohibition of the manual rewinding means by the prohibiting means is released and the operation is enabled, so that the operation of the manual rewinding when the automatic loading is not normally performed is prohibited, Inadvertent winding of the leading end of the film by a user's operation can be prevented.

When the back cover is opened and closed again, auto-loading is performed. If a tension is detected at this time, the auto-loading has already been performed. The film can be returned, and the film can be automatically loaded again without tension, or the back cover can be opened to take out the film, thereby facilitating the handling.

[Brief description of the drawings]

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 left side view thereof, FIG. 3 is a right side view thereof, and FIG. FIG. 5, FIG. 5 is a bottom view, FIG. 6 is a rear view, FIG. 7 is a plan view of a liquid crystal display,
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, FIG. 10 is a detailed diagram of a film motor driver circuit, and FIGS. FIG. 11 is a front view of a 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, FIG. 14 is an operation time chart of the shutter driving device, FIG. 15 is a flowchart showing the operation of the camera's sitter operation warning device, and FIG. 16 is a flowchart showing the operation of the film feeder of the camera. Reference numeral 1 is a main body, 2 is a back cover, S1 is a release button, S2 is a rewind button, S3 is a self-button, S4 is a barrier button, S5 is a synchro switch, 11 is a liquid crystal display, and 20 is a CP.
U and E1 are the main battery, E2 is the auxiliary battery, 21 is the drive circuit unit, 22 is the strobe circuit, 210 is the battery voltage check circuit, 2
11 is a photometry 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, 33 is an aperture blade, 38 is a shutter lever, 44 is a shutter lever spring, and 45 is a shutter. A lever cam, 48 is an aperture lever 50 is an aperture lever cam, 54 is a cam gear, and 55 is an intermediate gear.

Continuation of the front page (56) References JP-A-62-151830 (JP, A) JP-A-62-153942 (JP, A) JP-A-62-160435 (JP, A) JP-A-57-195233 (JP) JP-A-59-105623 (JP, A) JP-A-61-156244 (JP, A) JP-A-63-115133 (JP, U) JP-A-2-131738 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G03B 17/00

Claims (1)

(57) [Claims] A film reloading means for rewinding the film according to an instruction from an operator; and a prohibiting means for prohibiting the operation of the manual rewinding means. A camera characterized in that when the automatic loading by the first film feeding at the time of performing the normal operation is normally performed, the operation prohibition of the manual rewinding means by the prohibiting means is released to enable the operation.