JPH058593Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a barrier opening/closing device for opening and closing a protective barrier that shields the front surface of a photographic lens for a camera.

[Prior art]

In recent years, the use of motor power for film winding and rewinding has increased, and in this case, the barrier is also opened and closed using the motor power.

However, in such a device, if there is a small amount of film remaining after the last frame has been photographed, that remaining amount is wound, but the winding amount is not enough for one frame, so the winding operation is delayed. stops midway,
The barrier also stops in the middle. Therefore,
In such a case, the barrier must be returned to its original position by manual operation, but if this operation is forgotten, the photographing lens will not be protected.

[Purpose and structure of the invention]

It is therefore an object of the present invention to provide a barrier opening/closing device that does not require special operations to return the barrier to its original position.

In order to achieve this purpose, the present invention rewinds the film by operating a rewind switch after shooting is completed, and when the rewind is completed and the switch is returned to its original position, a slight winding operation is performed. This is how it was done. Hereinafter, the present invention will be described in detail using drawings showing embodiments.

〔Example〕

FIG. 1 is a mechanical diagram showing an embodiment of the barrier opening/closing device according to the present invention, in which FIG. 1a is a front view and FIG. 1b is a partial sectional view.

The running member 1 is a plate-like member, and includes long hole portions 1a and 1b, a rack portion 1c, a locking portion 1d, and a bent portion 1.
e, and a protrusion 1f.

The long holes 1a and 1b are pins 1 planted in the fixed part.
2, 13 and can move left and right,
Normally, it is biased to the left in FIG. 1A by a spring 14.

The rack portion 1c meshes with a pinion gear 2a of the governor 2. The governor 2 is used to reduce the moving speed of the traveling member 1 and control it to travel at a constant speed.

The engaging portion 1d engages with a hook claw 3a of a hook 3. The hook 3 is pivotally supported by a shaft 3b and has an attracting portion 3c. A relay 4 is provided opposite the attracting portion 3c. The relay 4 is energized by a release signal.

The bent portion 1e is a portion that restricts the spring 7 and applies a biasing force when the traveling member 1 is locked with the hook 3. At this time, the spring 7 biases the protective barrier 5 to rotate counterclockwise. The protective barrier 5 is for protecting the photographic lens 15 from dust and the like. Protective barrier 5
As shown in FIG. 1B, it is pivoted on the shaft 5a and rotates between the position shown by the solid line where it shields the lens 15 and the position shown by the chain line where it can take pictures. Protective barrier 5
is biased clockwise by spring 6, which is weaker than spring 7. The spring 6 is a spring for opening the protective barrier 5. The pin 16 is a member for regulating the right rotation end of the protective barrier 5.

The protrusion 1f engages with a pin 8c set on the set lever 8. The set lever 8 is a lever for setting the traveling member 1. The set lever 8 is biased counterclockwise by a spring (not shown),
It rotates around the axis 8d. A pin consisting of a large diameter portion 8a and a small diameter portion 8b is implanted in the center of the set lever 8. The large diameter portion 8a engages with the cam 9. The cam 9 is provided coaxially with the gear 10a. The rotation of the motor 18 is connected to the gear train 1 in the gear 10a.
0. The motor 18 is a motor for driving a camera motor.

The gear 10a is adapted to transmit rotational force to a film winding mechanism (not shown), and also incorporates a mechanism such as a one-way clutch that transmits rotational force only in one direction, so that it rotates only when the motor 18 rotates in the forward direction. It is designed to transmit power. The gear 19 also transmits rotational force to a film rewinding mechanism (not shown), but the film rewinding mechanism is configured to rewind the film only when the motor 18 is rotating in the reverse direction.

FIG. 2 is a circuit diagram showing an example of a circuit that drives the motor 18. In the figure, S1 is a check switch that is turned on when the release is pressed, S2 is a switch that is turned on when the release is pressed deeper to start the exposure sequence, and S3 is turned off only when the shutter is set, and in other conditions. The switch S4, which is turned on, is a switch that is connected to a sprocket (not shown) and is turned on when winding of one frame of the film is completed, and is turned off at other times. S5, S6, and S7 are configured to be interlocked and are switches for switching between forward and reverse rotation of the motor 18.

B is a battery, Q1 and Q2 are transistors, C1 is a motor control circuit, C2 is a shutter circuit,
C3 is a check circuit. In the motor control circuit C1, after the level of the charge terminal C1a changes from the "1" level to the "0" level, except when the switch S3 is off and the switch S4 is on,
A "0" level signal is sent from the terminal C1b. Note that this signal changes to the "1" level after a predetermined period of time has elapsed.

Furthermore, when the switch S3 is turned off and the switch S4 is turned on after sending a signal at the "0" level to the terminal C1b, the signal at the terminal C1b changes from the "0" level to the "1" level, and the signal is output from the terminal C1c for a predetermined period of time. It is designed to send out a "1" level signal.

Figure 3 shows the structure of switches S5, S6, and S7, and these switches have electrodes a to f provided on a single plate and a shorting piece that slides on these electrodes to short-circuit them. It consists of Each shorting piece is set to either the "A" position or the "B" position in the figure, and the "A" position is the position where the motor 18 is rotated in the normal direction, that is, the film is not wound. This is the position where the motor 18 is rotated in the direction of rotation, and the "ro" position is the position where the motor 18 is rotated in the reverse direction.
That is, this is the position where the film is rotated in the direction in which the film is rewound. Switch S5 in normal rotation position
The electrodes a and b are short-circuited, and the electrodes c and d of the switch S6 are short-circuited. In the reverse position, the electrodes a and c of the switch S5 are short-circuited, and the electrodes d and e of the switch S6 are short-circuited. Note that the switches S5 and S6 are defined as rewind switches.

The switch S7 short-circuits the electrodes b and f when the rewind switches S5 and S6 begin to move from the "b" position to the "a" position, and when the movement is completed, the short-circuit between the electrodes b and f is released. It's becoming like that. Note that the switch 7 is defined as an auxiliary switch.

In addition, in order to operate the motor control circuit C1 when the rewind switches S5 and S6 are changed from the reverse rotation position to the forward rotation position, the electrodes a of the switch S5,
In FIG. 3, electrodes a, b, f are connected to l1 so that the short circuit of electrodes b, f is opened after b is short-circuited.
It is set at a position that satisfies the condition >l2.

Next, the operation of the embodiment of the barrier opening/closing device according to the present invention will be explained.

Normally, the protective barrier 5 shields the lens 15 in the state shown in FIG. 1a. At this time, even if the protective barrier 5 is opened and closed from the outside, no load is applied to the internal mechanism because it is only biased by the springs 6 and 7.

When a release button (not shown) is pressed, the relay 4 is energized, attracts the suction portion 3c of the hook 3, and rotates the hook 3 clockwise. Therefore, the engagement between the hook pawl 3a of the hook 3 and the engaging portion 1d of the running member 1 is released, and the running member 1 starts running to the left due to the biasing force of the spring 14.

As the traveling member 1 travels, the bent portion 1e is moved by the spring 7.
Since the protective barrier 5 is no longer restricted, the protective barrier 5 is rotated clockwise by the biasing force of the spring 6 and reaches the photographing position shown by the chain line. At the same time, the traveling member 1 moves to the left end, releases a hook (not shown), and opens the shutter.

A period T1 in FIG. 4 shows a state in which the switches S1 to S3 are turned on by pressing the release button and an exposure operation is performed. At this time,
The operation timings of the switches S2 and S3 shown in b and c are determined by a mechanism not shown.

After photographing, the motor 18 rotates in the forward direction through gear train 1.
0, rotate the cam 9 clockwise. As the cam 9 rotates, the set lever 8 is rotated clockwise by the large diameter portion 8a serving as a follower. The pin 8c at the tip of the set lever 8 moves the traveling member 1 to the right, and the bent portion 1e restricts the spring 7 to rotate the protective barrier 5 counterclockwise. At this point, the photographing lens 15 is shielded again. Further, when reaching the right end, the relay 4 is no longer energized, so the hook 3 rotates counterclockwise, and the hook pawl 3a engages with the locking portion 1d of the running member 1, returning to the initial state.

Release the release button at time t2 in FIG.
When the switch S1 is turned off, a signal of the "0" level is sent from the terminal C1b of the motor control circuit C1, and the transistor Q1 is turned on, so that a current flows in the direction of the arrow X to the motor 18, and the film is wound and the next image is taken. Start setting the shutter for When the shutter setting is completed, the switch S3 is turned off, and the switch S4 is turned off immediately after the start of winding, and turned on again when the winding of one frame is completed.
The timing of operation of these switches S3 and S4 is determined by a mechanism linked to the film winding operation, and the winding of one frame of film is performed during the period T2. Time t3
, the switch S4 is turned on, but since the switch S3 is already turned off, the "0" level signal sent from the terminal C1b of the motor control circuit C1 changes to "1" level, and a predetermined signal is sent from the terminal C1c. A signal at the "1" level is sent out for a certain period of time, and the motor 18 is braked.

The above-mentioned operation is also carried out at the last photographic frame of the loaded film, so if there is any remaining amount of film, further film winding is performed. However, there is not enough film left for one frame, so
It stops winding in the middle. At this time, the winding mechanism cannot turn on switch S4 since the winding operation is not completed. For this reason, the film is not wound, but the motor 18 is energized, and at this time, the timer in the motor control circuit C1 is activated, and after a predetermined time, the motor 18 is energized.
8 is cut off. However, if the film is wound halfway at this time, the barrier 5 may have moved from the photographic lens protection position. In such a case, this device returns the barrier 5 to the shielding position as follows.

First, when the rewind switches S5 and S6 are moved from the forward rotation position "A" to the reverse rotation position "B" in FIG. A return is made. That is, as shown in FIG. 5, when the rewind switches S5 and S6 are started at time t1, the switch 7 is turned on at time t2, as shown in FIG. 5b, and the charge terminal C of the motor control circuit 1C is turned on.
A "1" level signal is supplied to 1a. and,
At time t3, electrodes a and b of switch S5 are turned off, so switch S
The voltage is no longer sent from the terminal C1a, and therefore the signal supplied to the charge terminal C1a becomes zero level as shown in b. As a result, the motor control circuit C1 sends out a "0" level signal from the terminal C1b, but since the electrodes a and b of the switch S5 are cut off, the transistor Q1 remains off, and the signal is sent out from the motor control circuit. signals are ignored.

At time t4, film rewinding is completed,
When the operation of returning the rewind switches S5 and S6 from the reverse rotation position to the normal rotation position is started, the switch S7 is turned on at time t5 as shown in b, but at this time, the electrodes a and b of the switch S5 are not short-circuited. Therefore, no voltage is supplied to the charge terminal C1a. Then, at time t6, electrodes a and b of switch S5
is short-circuited and a voltage is sent out through the switch S5 as shown in a, so that a "1" level signal is supplied to the charge terminal C1a. Then, at time t7, the switch S7 is turned off, and as shown in b, the "1" level signal supplied to the charge terminal C1a changes to the "0" level. Therefore, the motor control circuit C1 is connected to the terminal C1b.
Since a signal of "0" level is sent from the motor 18, the motor 18 rotates in the normal rotation direction.

As a result, the cam 9 is rotated clockwise via the gear train 10 in FIG. 1, and the set lever 8 is rotated clockwise, so that the barrier 5 shields the photographing lens 15 and returns to the initial state. . That is, the barrier 5, which had stopped midway due to the amount of remaining film, is returned to its original position.

[Effect of idea]

As explained above, the present invention reverses the motor by operating the rewind switch, and after rewinding the film, returns the rewind switch to the normal rotation of the motor. Therefore, even if the barrier stops midway after the completion of photographing the final frame, the barrier can be returned to the shielding position that protects the photographic lens, and the photographic lens is protected.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the mechanism of this invention.
a is a front view, b is a partial sectional view, Fig. 2 is a circuit diagram of the electric circuit section, and Fig. 3 is a switch S shown in Fig. 2.
FIG. 4 is a time chart for exposure and winding operations, and FIG. 5 is a time chart for film rewinding. 1... Running member, 1a, 1b... Long hole portion, 1d
...Locking part, 1e... Bent part, 1f... Projection part,
3a... Hook claw, 4... Relay, 5... Protective barrier, 6, 7... Spring, 8... Set lever,
8c...pin, 9...cam, 10...gear train, 1
8...Motor, C1...Motor control circuit, Q1, Q2...Transistor, S1-S7...
…switch.

Claims (1)

[Scope of Claim for Utility Model Registration] A barrier 5 that is released from restriction and moves to a photographing position by causing a traveling member 1 to travel based on the operation of a release button, and a first drive signal that is generated based on the operation of the release button. a drive signal generation circuit S1; a motor control circuit C1 that drives the motor 18 in forward rotation for a predetermined period of time when a drive signal is supplied; and a photographing lens 15 by driving the motor in forward rotation.
an initial state restoring means for returning the barrier to its initial state in order to shield the film; rewinding switches S5 and S6 for driving the motor in reverse when rewinding the film after the last frame of the film has been photographed; The rewind switch operates to return the motor from the reverse rotation position where it drives the motor in the reverse direction to the normal rotation position where it drives the motor forward, thereby generating a second drive signal, and transmitting the generated second drive signal to the motor control circuit. An auxiliary switch S7 is provided in parallel with the drive signal generation circuit, and the motor control circuit drives the motor in the normal rotation when supplied with the second drive signal, thereby restoring the initial state to shield the photographing lens. A barrier opening/closing device characterized by driving means to return the barrier to its initial state.