JPH0432372B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device used in a camera for electrically winding and rewinding photographic film, and in which a release lock is applied while the motor is rotating.

Conventional cameras that use an electronic shutter cannot obtain a proper shutter speed if the power goes out, so the release lock is now activated using a magnet that regulates when the shutter closes. There is.

Recently, cameras have been provided on the market in which a motor is installed in the camera to electrically wind and rewind photographic film. In this type of electric camera, the shutter operates simply by pressing the release button, and when the release button is released, the motor rotates to wind the photographic film and set the shutter. In this case, since the shutter is set as the photographic film is being wound, if the release button is pressed while the motor is rotating and the photographic film is being wound, the shutter may malfunction. In the worst case, there is a problem that it may break down.

A camera has also been proposed which detects the running state of the photographic film and automatically rewinds the film when the photographic film stops running. In this camera, it is possible that the release button is pressed by mistake during rewinding, and the above-mentioned problem also occurs in this case.

SUMMARY OF THE INVENTION In view of the above drawbacks, it is an object of the present invention to provide a release lock device in which the shutter is not operated while the motor is rotating.

In the present invention, the release lock is achieved by preventing the magnet from being energized while the motor is rotating.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a motor 1 is housed, for example, in a take-up spool (not shown), and is used to wind and rewind photographic film, set a shutter, etc. When forward rotation relay switch S1 is connected to contact a and reverse rotation relay switch S2 is connected to contact b, motor 1 and power supply 2 are connected in series, and the motor rotates in the forward direction to rotate the photographic film. Carry out winding and shutter setting. Conversely, when the forward rotation relay switch S1 is connected to the contact point b and the reverse rotation relay switch S2 is connected to the contact point a, the motor 1 rotates in the reverse direction to rewind the photographic film.

Frame feed switch S3 connects to contact b and turns OFF when the sprocket (not shown) rotates by a predetermined amount and feeds one frame of photographic film.
After the shutter operates and while the photographic film is being fed by one frame, it is connected to contact a and remains in the ON state. Therefore, when winding photographic film, motor 1 is turned on by turning on this frame feed switch S3.
rotates, turns OFF, motor 1 stops,
During this time, the photographic film is wound.

The jump feed switch S4 is connected in parallel with the frame feed switch S3, and is turned ON during the winding of the first jump feed frame and turned OFF during the winding of the first frame. This blank feed switch S4 is operated in conjunction with a counter mechanism that displays the number of frames to be photographed. When the jump feed switch S4 is ON, the motor 1 continues to rotate even if the frame feed switch S4 is turned OFF, so that jump feed pieces can be wound continuously. Between the connection point P and the frame advance switch S3,
A CR time setting circuit consisting of a resistor 3 and a capacitor 4 is connected. A connection point A between the resistor 3 and the capacitor 4 is connected to the + side input terminal of the comparator 5. The negative input terminal of this comparator 5 is
It is connected to the connection point B between resistors 6 and 7. These constitute a timer circuit that measures a time t that is shorter than the time T required to wind up one frame of photographic film (see FIG. 4).

A forward rotation relay coil (hereinafter simply referred to as a forward rotation relay) 8 is connected to the output terminal of the comparator 5, and is energized when the output is "L" to change the forward rotation relay switch S1 from contact b to contact a. Switch to rotate motor 1 in the forward direction.

A transistor 9 is connected in parallel to the capacitor 4, and as shown in FIG.
Turns on with the pulse signal of , discharges capacitor 4, and resets the forward rotation timer circuit. This differentiating circuit 10 has a film running detection switch S5.
Outputs one pulse signal when turned off. The film running detection switch S5 includes, for example, a plurality of pins provided on a driven sprocket that is rotated by engaging with the perforation of the photographic film.
It is turned on and off by this pin. Differential circuit 1
A lamp 11 is connected to the output terminal of 0,
The running status of the photographic film is displayed by blinking the lamp 11.

Between the connection point Q and the frame advance switch S3,
A capacitor 12 and a resistor 13 are connected in series, and their connection point is connected to the positive input terminal of a comparator 14. Also, comparator 1
A connection point between resistors 15 and 16 is connected to one side input terminal of 4. In this timer circuit, at the start of frame advance, the frame advance switch S3 contacts contact a.
The time required for the output terminal of the comparator 14 to invert from "H" to "L" is
This delay is sufficient for the forward rotation relay switch S1 to switch from contact b to contact a. In this case, the forward rotation relay switch S1
When connected to contact a, the timer circuit becomes inactive, so the output terminal of the comparator 14 becomes "H".
It remains as it is. This also means that in order to rewind the photographic film, the forward rotation relay switch S1 is connected to contact a.
It also operates when the switch leaves contact b and switches to contact b, delaying the comparator 14, and then setting the output terminal of the comparator 14 to "L" to reverse the relay coil (hereinafter simply referred to as the reverse relay) 17.
Turn on the power and switch the reversing relay switch S2 to contact a. Further, this comparator 14 is also used to shut off the reverse rotation relay 17 and stop the motor 1 during reverse rotation when the frame advance switch S3 is turned off after rewinding is completed.

A series circuit of a resistor 18 and a capacitor 19 and a series circuit of resistors 20 and 21 are connected between the anode of the power supply 2 and the connection point P, respectively. The connection point C between the resistor 18 and the capacitor 19 is connected to the positive input terminal of the comparator 22, and the connection point C between the resistor 18 and the capacitor 19 is
Connection point D of 1 is connected to one side input terminal.
This reversal timer circuit is activated when the reversing relay switch S2 is connected to contact a to form a reversing circuit for the motor 1, and the capacitor 19 is continuously charged and the voltage at point C changes to the voltage at point D. The output terminal of the comparator 22 is set to "L" only during the time it takes to rise to the voltage. Note that this time is desirably set to be relatively long in order to completely wrap the leading edge of the photographic film into the cartridge. Said capacitor 1
A transistor 23 is connected in parallel with 9,
It is turned on by the pulse signal of the differentiating circuit 10.

The comparators 14 and 22 are open collectors, and when either one is "L", the reversing relay 17 is energized. Comparator 14
is used to regulate the start and end of energization of the reversing relay 17, and the comparator 22 acts during that time to reverse the motor 1 and rewind the photographic film into the cartridge.

Figure 2 shows the shutter control device.
Bus bar 25 is connected to connection point P via switch S6, and bus bar 26 is connected to connection point R. The connection point between the light receiving element 27 and the capacitor 28 is connected to the positive input terminal of the comparator 29, and the connection point between the resistors 30 and 31 is connected to the one side input terminal. When the switch S7 is turned off, the capacitor 28 is charged with a current according to the brightness of the subject, and when the potential reaches a predetermined potential, the output terminal of the comparator 29 is inverted from "H" to "L".

A transistor 32 is connected to the output terminal of this comparator 29.
A magnet 33 is connected between the emitter of the shutter and the busbar 25 for controlling the opening time of the shutter. Further, a transistor 34 is connected in series with the transistor 32 and the magnet 33. A voltage obtained by dividing the voltage at the connection point Q by resistors 35 and 36 is applied to the base of the transistor 34.

FIG. 3 shows the release block mechanism. While the motor 1 is hoisting 1/2 frame, the shutter drive lever 40 is activated by a leaf cam or the like.
is moved to the left end against the spring 41, and the tip of the lock lever 42 is locked in the locking portion 40a. A control lever 43 is rotatably mounted on the shutter drive lever 40 around a shaft 44.
A claw 43a is formed at one end of the control lever 43, and the other end is located above the opening 40b of the shutter drive lever 40. A bent portion 45a of a three-pronged magnetic interlocking lever 45 is inserted into the opening 40b. magnet 33
When the magnet is turned OFF and the attraction of the attraction piece 45b is released, the magnet interlocking lever 45 is activated by the spring 46.
The control lever 43 is rotated clockwise by the bending portion 45a, and the control lever 43 is rotated counterclockwise.

When the control lever 43 and the shutter drive lever 40 move to the right with the pawl 43a locking one end of the lever 47, the lever 47 is rotated clockwise and the pawl 43a is disengaged from the one end of the lever 47. At this time, the lever 47 is rotated counterclockwise by the spring 48.

The lever 47 is connected to the shutter blade 49 by a pin 47a and a long hole 49a. When the shutter blade 49 pivots clockwise around the shaft 50, the notch 49b overlaps the aperture 51, so that light passing through the notch 49 exposes the photographic film.

The release lever 52 is provided with a notch 52a, a locking portion 52b, and a bent portion 52c, and moves downward against the spring 53. Notch 5
One end of the lock lever 42 is inserted into 2a, and when the release lever 52 is pressed down,
The lock lever 42 is rotated clockwise at its upper edge. The locking portion 52b locks the magnet interlocking lever 45 when the magnet 33 is not energized.
45c to prevent the release lever 52 from being pressed down and prevent the shutter from being operated.

Next, the operation of the present invention having the above configuration will be explained.

When you press the release lever 52 after loading photographic film into the camera, the switch S6 is activated first.
Turn on. Since the forward rotation relay switch S1 and the reverse rotation relay switch S2 are both connected to the contact a, the connection points P and Q are connected to the + pole of the power supply 2, and the connection point R is connected to one pole. Therefore, the shutter control device is activated, and the output terminal of the comparator 29 becomes "H". transistor 3
Since magnets 2 and 34 are turned on, the magnet 33 is energized and attracts the attraction piece 45b.

When the attraction piece 45b is attracted by the excitation of the magnet 33, the magnet interlocking lever 45 resists the bias of the spring 46 and is restrained in the position shown in FIG. Therefore, continue to press release lever 5.
2 is pressed and the locking portion 52b moves to a position facing the pawl 45c of the magnetic interlocking lever 45, the pawl 45c does not enter the locking portion 52b and the release lever 52 cannot be pushed further. can.

On the other hand, if the power supply 2 is exhausted, or if energization of the magnet 33 is prohibited as described later, the magnet 33 will be energized even if the switch S6 is turned on at the beginning of pressing the release lever 52. Never. Therefore, the magnet interlocking lever 45 is not restrained by the magnet 33, and can be rotated clockwise by the bias of the spring 46. Then, when the release lever 52 is continuously pressed and the locking portion 52b moves to a position facing the pawl 45c, the magnet interlocking lever 45 rotates clockwise due to the bias of the spring 46, and the pawl 45c It moves to the release lock position where it enters the locking portion 52b and prevents the release lever 52 from being pressed thereafter.

When the release lever 52 is further depressed while the magnet 33 is energized, the lock lever 42 is rotated clockwise by the upper edge of the notch 52a and is disengaged from the locking portion 40a of the shutter drive lever 40. The shutter drive lever 40 starts moving rightward together with the control lever 43 due to the spring 41.

Since the control lever 43 is connected to the lever 47 by a pawl 43a, it is rotated clockwise against the spring 48. When this lever 47 rotates, the shutter blade 49 also rotates clockwise so that the notch 49 overlaps with the aperture 51, and the opening amount increases in accordance with the amount of rotation. This results in
Photographic film is exposed, but this frame is
The subject is not recorded because it is exposed when the photographic film is loaded.

When the shutter drive lever 40 starts moving,
Since the switch S7 is turned off, the light receiving element 27
The capacitor 28 is charged in accordance with the brightness of the subject measured in . When capacitor 28 is charged to a predetermined voltage, comparator 29 is inverted to turn off transistor 32. magnet 3
3 is cut off, the adsorption piece 45b is released, and the magnet interlocking lever 45 is moved by the spring 46.
The bent portion 45 rotates clockwise due to the accumulated force of
Push up one end of the control lever 43 with a. At this time, the claw 45c of the magnetic interlocking lever 45 enters the notch 52a of the release lever 52.
There is no conflict between the two.

When the control lever 43 is rotated counterclockwise, the lever 47 that has been rotated while engaging with the pawl 43a is released, so that the shutter blade 49 quickly returns counterclockwise and closes the aperture 51. Terminate exposure.

When the shutter drive lever 40 returns to the right, the vertical piece 40c of the shutter drive lever 40 moves to the bent portion 5 of the release lever 52.
It collided with 2c and was stopped immediately. When the release lever 52 is released, it rises, the vertical piece 40c comes off the bent portion 52c, and the shutter drive lever 40 moves to the right end. When the release lever 52 is raised, the lock lever 42 and the magnetic interlocking lever 45 are rotated counterclockwise, and the switch S6 is turned OFF to disable the shutter control device.

When the shutter drive lever 40 returns to the right end, the frame advance switch S3 connects to contact a and turns ON as shown in FIG.
The output terminal of becomes "L". The forward rotation relay 8 switches the forward rotation relay switch S1 from contact b to contact a. Since the reverse relay switch S2 is connected to contact b, current flows through the motor 1 in the direction shown by the solid line, and the motor 1 rotates in the normal direction. The motor 1 pulls out the photographic film from the cartridge and winds it onto the take-up spool, and while only 1/2 frame is being wound, the shutter drive lever 40 is pushed to the left to set the shutter. In other words, the shutter drive lever 40 moves to the left end against the spring 41 and is locked by the lock lever 42, keeping the switch S7 in the ON state. Further, the control lever 43 has a claw 43a that engages with one end of the lever 47.

While the motor 1 is rotating forward, the connection point Q is connected to one pole of the power supply 2, so the transistor 34 is turned off and the magnet 33 is not energized. Therefore, as described above, the claw 45c of the magnetic interlocking lever 45 engages with the locking portion 52b, so the release lever 52 cannot be pressed down. This can prevent the shutter from being activated during winding.

During winding of the photographic film, the film running detection switch S5 is turned on eight times per frame in conjunction with the sprocket. As shown in detail in FIG. 6, the differentiating circuit 10 outputs a pulse signal at the falling edge of the film running signal, blinks the lamp 11 to display the film running status, and turns on the transistor 9 at a predetermined period. . Since the capacitor 4 is discharged by the transistor 9, the forward rotation timer circuit is reset at regular intervals. Therefore, the output terminal of the comparator 5 remains at "L", and the forward rotation relay 8 is energized until the frame advance switch S3 is turned off.

During winding of the film frame, the film frame feed switch S4 is activated in conjunction with the counter disc that displays the number of film frames.
is on. As a result, the photographic film frame is wound up and the frame advance switch S3 is turned off.
Even when turned off, comparator 5 remains in operation,
The motor 1 rotates continuously and winds up a total of three free-feeding pieces. Then, during the winding of the first piece, the jump feed switch S4 turns OFF.
When the frame advance switch S3 is turned off and it is detected that one frame has been wound up, the comparator 5 becomes inactive and its output terminal becomes "H".
As a result, the forward rotation relay 8 is cut off, so the forward rotation relay switch S1 switches to contact b.
The motor 1 is electrically braked and suddenly stops.

As mentioned above, if you press the release lever 52,
The shutter operates and the first frame is photographed.
When the release lever 52 returns, the motor 1 rotates forward again to wind up the second piece.

If the cartridge you are using has a 36-shot capacity, you will normally be unable to pull out the photographic film from the cartridge midway through the winding of the 37th frame. In this case, since the photographic film stops running, no pulse signal is output from the differentiating circuit 10. As shown in FIG. 4, since the capacitor 4 is continuously charged, when the time t, which is shorter than the time T required to wind up one frame, has elapsed, A
The voltage at point increases to the voltage at point B.

As shown in FIG. 5, when time t has elapsed after the film stopped running, the comparator 5 is reversed and its output terminal becomes "H", the forward rotation relay 8 is cut off, and the motor 1 is stopped. . In this case, since the frame advance switch S3 is ON,
When the forward rotation relay switch S1 leaves contact a, the potential at point Q becomes +. As a result, the comparator 14 enters the operating state, and its output terminal becomes "L" after a sufficient time has elapsed for the forward rotation relay switch S1 to connect to the contact point b. When the output terminal of the comparator 14 becomes "L", the reversing relay 17 is energized and the reversing relay switch S2 is switched from contact b to contact a. Motor 1
Since a reversing circuit is formed, reversing starts, and at the same time, the comparator 22 becomes operational and its output terminal becomes "L".

When the motor 1 starts reverse rotation, the photographic film wound on the take-up spool is rewound into the cartridge, and the shutter drive lever 40 is pushed to the left end to set it. During rewinding of the photographic film, the transistor 2 receives a pulse signal from the differentiating circuit 10.
3 repeats ON and OFF to discharge the capacitor 19. Therefore, since the reversal timer circuit is reset at a predetermined period, comparator 2
2, its output terminal is held at "L".

When the photo film is almost finished rewinding, the perforation will come off the sprocket.
The film running signal is no longer output from the film running detection switch S5. As a result, the differentiating circuit 10 no longer outputs a pulse signal, the lamp 11 stops blinking, and the transistor 23 is turned off. When the capacitor 19 is charged with an approximately constant current and the voltage at point C is charged up to the voltage at point D, the output terminal of the comparator 22 becomes "H". However, since the frame advance switch S3 of the comparator 14 is ON and its output terminal is set to "L", the reversal relay 17 continues to be energized. And the frame advance switch S3
When turned OFF, the comparator 14 becomes inactive. Since the capacitor 12 is immediately discharged, the output terminal of the comparator 14 becomes "H" and the reversing relay 17 is cut off. When the reversing relay 17 is cut off, the reversing relay switch S2 closes contact b.
, the electrical control of the motor 1 is temporarily stopped. When the reverse rotation is stopped, the shutter drive lever 40 moves to the left end, and the shutter is in the set state.

When this reversing relay 17 is ON, point P is connected to one pole, so even if the release lever 52 is pressed, the magnet 33 is not energized and the release lock is engaged.

In the above embodiment, one end of the motor is connected to the power supply line of the shutter control device, and the other end of the motor is connected to the control input terminal of a switching circuit connected in series with the magnet. Two switching circuits may be provided, and these switching circuits may be turned on and off using the voltage across the motor. Furthermore, the output terminals of comparators 5 and 22 are connected to a NOR circuit, and this NOR
A switching circuit that controls energization of the magnet may be turned on and off using the output signal of the circuit.

In the present invention having the above structure, the release is locked while the motor is rotating, so it is possible to prevent the shutter from malfunctioning due to the release lever being pressed by mistake.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of the motor control device, Fig. 2 is a circuit diagram of the shutter control device, Fig. 3 is a front view showing the shutter mechanism, Fig. 4 is a timing chart of the motor control device in the winding state, and Fig. 5 is a timing chart of the motor control device. The figure shows a timing chart in a rewinding state, and FIG. 6 shows a timing chart in a resetting state of the forward rotation timer circuit. 1...Motor, 8...Relay for forward rotation, 10...
Differential circuit, 17... Reverse relay, 27... Light receiving element, 33... Magnet, 40... Shutter drive lever, 43... Control lever, 45... Magnet interlocking lever, 45c... Claw, 49... Shutter Blade, 51...Aperture, 52...Release lever, 52b...Locking portion, S1...Forward rotation relay switch, S2...Reverse rotation relay switch,
S3...Switch for frame feed, S4...Switch for blank feed, S5...Switch for detecting film running.

Claims (1)

[Claims] 1. In a release lock device that energizes the magnet that controls the opening and closing of the shutter at the initial stage of pressing the release lever, and when the magnet is not energized, moves the locking member to the release lock position to prevent the release lever from being pressed further. When a motor for winding and rewinding the photographic film is rotating, the magnet is de-energized and the locking member is moved to a release lock position to prevent the release lever from being pressed. A release lock device characterized by: