JP3023044B2 - Camera shutter drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter driving device for a camera, and more particularly to a shutter driving device in which unlocking of a film winding mechanism and shutter release are controlled in relation to each other.

[0002]

2. Description of the Related Art Conventionally, in a large format camera, film winding, shutter charging, and shutter release are manually performed. That is, the shutter is released by the shutter button after the film is wound up by a fixed amount and the shutter charge lever is set, and these operations are performed independently of each other. For this reason, there is an inconvenience that double shooting, aerial shooting, and the like occur.
No. 260662 is proposed. In the control of the camera disclosed therein, the unlocking of the film winding mechanism and the shutter release are associated with each other. If the film is not wound, shooting cannot be performed, and the shutter for shooting is released by the electromagnetic actuator. At the same time, the film winding lock is released.

[0003]

However, in a conventional shutter driving device such as a large-format camera, when taking a picture by long-time exposure, it is necessary to take a long time during the exposure.
Since the electromagnetic actuator is operated, there is a problem that battery consumption is increased and battery life is shortened.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to avoid the use of an electromagnetic actuator when performing long-time exposure, and to control the shutter drive of a camera capable of suppressing battery consumption. It is to provide a device.

[0005]

In order to achieve the above object, a camera shutter driving apparatus according to the present invention comprises an electromagnetic actuator for releasing a shutter and an electromagnetic actuator for releasing a film winding lock mechanism. Setting an electromagnetic actuator circuit for supplying power to the two electromagnetic actuators by operating a shutter button, means for manually performing shutter release and release of a film winding lock mechanism without using a shutter button, and setting a shutter speed. A projection formed on the rotating member;
A switch that is opened by the projection when the rotating member moves to the set position for a long time, and that switches the electromagnetic actuator circuit into a disconnected state. According to a second aspect of the present invention, there is provided a shutter button operable only when the winding lock mechanism is operated, and a charge lever for manually charging the shutter. A first switch that closes when the shutter is charged;
A second switch that closes when the shutter button is operated, and is connected so that both electromagnetic actuators operate only when the first and second switches are both closed.

[0006]

According to the first aspect of the present invention, when the shutter button is pressed, the two electromagnetic actuators operate, the shutter is released, and at the same time, the film winding lock mechanism is released, and the film is wound. Becomes possible. On the other hand, instead of using the shutter button, for example, a manual release button can be used to manually execute a shutter release, and a manual release button can be used to manually release the film winding lock mechanism. When performing long-time exposure, the shutter speed dial is set to the long-time position. At this time, the projection opens the disconnection switch, and the electromagnetic actuator circuit is disconnected. Therefore, if the manual release button is continuously pressed, the exposure can be performed for a long time, and the electromagnetic actuator does not operate at all.

According to the second aspect of the invention, when the film is manually wound up by one sheet and the winding mechanism is locked, the shutter button can be pressed. However, if the charging operation is not being performed, the shutter operation is not performed even if the shutter button is pressed because the first switch is not closed. This prevents aerial photography. When the shutter charge is executed, the first switch is closed, and when the second switch is further closed by the shutter button, the two electromagnetic actuators are operated, and the shutter is released and, at the same time, the winding lock mechanism is released. Is done. At this stage, the film can be wound, but the shutter button cannot be pressed here. Therefore, double shooting cannot be performed. Even in such a configuration, when the shutter speed setting dial is set to the long-time position, the electromagnetic actuator circuit is disconnected and the battery is not consumed.

[0008]

FIG. 1 shows a configuration of a shutter drive device of a camera according to an embodiment, and FIG. 2 shows an operation circuit of an electromagnetic actuator. In FIG. 1, a shutter driving device 10 includes a camera body 12 and an interchangeable lens unit 14, and is applied to a large format camera. The main body 12 has a winding roller 18 for winding the film 16 and a winding lever 20 for rotating the winding roller 18.
The winding roller 18 and the winding lever 20 are provided.
, A gear 22 that rotates in conjunction with the winding operation of the winding lever 20 is inserted.

A crescent-shaped locking lever 24 is rotatably mounted on the housing of the main body 12 on the main body 12, and a claw at one end of the locking lever 24 is connected to the gear 22.
Is attached so as to be able to engage with. This locking lever 24
, A solenoid 26 and a core 28 are provided as electromagnetic actuators.
Is arranged so as to press the other end. Such a locking lever 24 and the electromagnetic actuator constitute a winding lock mechanism. Therefore, when a current flows through the solenoid 26, the locking lever 24 is pushed by the core 28 and rotated counterclockwise (turning), whereby the engagement with the gear 22 is released. In this state, the film 16 can be wound up. However, when one sheet of the film 16 is wound up,
The locking lever 24 is rotated clockwise by a driving mechanism linked to a counter (not shown), and is engaged with the gear 22.

The core 2 of the electromagnetic actuator
A manual release button 29 having a drive shaft at a position where
The manual release button 29 is arranged on the outer surface of the camera so that it cannot be operated carelessly. Therefore,
By pressing the core 28 by manual operation of the manual release button 29, the locked state of the locking lever 24 can be released. Further, a non-locking shutter button 30 is provided on the main body 12, and the shutter button 30 can be pressed only when the locking lever 24 is engaged with the gear 22 by various known structures. It is configured to be possible. An electromagnetic actuator circuit 32 is provided to drive the solenoid 26.

On the other hand, lenses 44, 4
6. A shutter portion 48 is disposed, and the shutter portion 48 includes a shutter charge lever 50 and a release lever 5.
2 are provided. By moving the charge lever 50 to the upper side of the arrow, the urging force can be charged and a shutter (not shown) can be set. In the vicinity of the release lever 52, a solenoid 54 and a core 56 are provided as electromagnetic actuators, and the core 56 is arranged so as to push the release lever 52. Accordingly, when a current flows through the solenoid 54, the release lever 52 is pushed by the core 56 to operate, thereby opening and closing the shutter. An electromagnetic actuator circuit 58 is provided so as to be connected to the solenoid 54, and the electromagnetic actuator circuit 58 is connected to the electromagnetic actuator circuit 32 on the main body 12 side.

Further, the core 56 of the electromagnetic actuator
Manual release button 5 having a drive shaft at a position where the user can press
The manual release button 57 is also provided on the outer surface of the camera so that the manual release button 57 cannot be operated carelessly. Accordingly, the release lever 52 can be driven by pushing the core 56 by manual operation of the manual release button 57. Further, a shutter speed dial (rotating member) 59 is arranged coaxially with the shutter section 48,
A projection 61 is attached to the shutter speed dial 59, and a cut switch 63 is
Switch pieces 63A and 63B are arranged. That is,
When the shutter speed dial 59 is turned to the position (end position) for a long time, the projection 61 presses the switch piece 63A. When the switch piece 63A separates from the switch piece 63B, the disconnection switch 63 is opened. (OFF) state.

FIG. 2 shows the electromagnetic actuator circuit 3
2 and 58 are shown in detail, and as shown, both electromagnetic actuator circuits 32, 58 connect contacts 34 and 6
Connected by 0. That is, in the embodiment, the solenoid 26 and the solenoid 54 are connected not in series but in parallel to the battery 36 disposed on the main body 12 side, and the first switch is connected to the lens unit 14 side on the common line in the center of the drawing. The second switch 38 is connected to the disconnect switch 62, the disconnect switch 63, and the main body 12. The first switch 62 is closed in conjunction with the setting operation of the charge lever 50, and is opened in conjunction with the shutter release operation. The second switch 38 is connected to the shutter button 30.
Is closed in conjunction with being pressed. Therefore, the solenoids 26 and 54 operate when the charge lever 50 is set and the shutter button 30 is pressed in a state where the disconnect switch 63 is not turned off.

The shutter speed dial 5
When the disconnect switch 63 is opened by the long time setting of 9, the electromagnetic actuator circuit is disconnected, and the electromagnetic actuator does not operate even if the first switch 62 and the second switch 38 are turned on.

The embodiment has the above configuration, and its operation will be described below. First, when the winding lever 20 of FIG. 1 is manually turned to wind the film 16 by one frame, the locking lever 24 is locked to the gear 22 and the film winding mechanism is locked. Next, when the charge lever 50 of the shutter unit 48 is moved to enable shooting (charged state), the first switch 62 in FIG. 2 is closed. After that, in shooting without performing long-time exposure, the shutter button 30 is pressed, and at this time, the second switch 38 is closed, so that a predetermined voltage and current are supplied from the battery 36 to both the solenoids 26 and 54. Then, the electromagnetic actuator operates. That is, in the lens unit 14, the core 56 moves and presses the release lever 52, so that the shutter is released and shooting is performed. In the main body 12, the core 28 moves and presses the locking lever 24, so that the lock of the winding mechanism is locked. Is released. The first switch 62 is opened in conjunction with the release operation. Therefore, the film can be further wound, and the above operation can be repeatedly executed.

According to the above-mentioned operation, when the winding of the film 16 is forgotten, regardless of whether or not the charge lever 50 is set, the locking lever 24 is in the released state, so that the shutter button 30 is pressed. It is not possible. Therefore, double shooting can be prevented. Also, even if the film is wound up, if you forget to charge,
Since the first switch is not closed, the shutter operation is not performed even if the shutter button 30 is pressed. Accordingly, this prevents aerial photography. In addition, since the solenoids 26 and 54 are connected in parallel with the battery 36 to the solenoids 26 and 54 of the above-described embodiment, a stable solenoid drive voltage is supplied, and a battery with a small output is used. Even so, there is an advantage that sufficient electric power can be supplied to the operation of the electromagnetic actuator.

When performing long-time exposure, the shutter speed dial 59 is turned counterclockwise to set it at the long-time position. At this time, the projection 61 presses the switch piece 63A. 63B is separated and the disconnect switch 63 is opened. Therefore, FIG.
The electromagnetic actuator circuit is disconnected, and power is not supplied to the solenoids 26 and 54 even if the shutter button 30 is pressed. In this state, when the manual release button 57 of FIG. 1 is pressed, the shutter is opened by the operation of the release lever 52, and the desired long-time exposure can be performed by keeping the manual release button 57 pressed. As described above, in the long-time exposure, no battery is consumed since the exposure is not performed by the electromagnetic actuator.

After the long-time exposure is completed, the manual release button 29 is pressed to release the gear 2 of the locking lever 24.
2 is released, so that one film 16 can be wound up.

[0019]

As described above, according to the first aspect of the present invention, a manual means for releasing the shutter release and the film winding lock mechanism and the shutter speed are set without using the shutter button. Since a projection formed on the rotating member and a switch for disconnecting the electromagnetic actuator circuit during long exposure by the projection are provided, use of the electromagnetic actuator during long exposure is avoided. It is possible to suppress battery consumption and extend the life of the battery.

According to the second aspect of the present invention, the first switch and the second switch are provided, and the present invention is applied to a configuration in which both electromagnetic actuators operate only when both switches are closed. And a device that can prevent aerial photography and the like, and can eliminate battery consumption during long-time exposure.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a shutter drive device of a camera according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of an electromagnetic actuator circuit of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Shutter drive device, 12 ... Camera body, 14 ... Lens part, 24 ... Locking lever, 26, 54 ... Solenoid, 28, 56 ... Core, 29 ... Manual release button, 32, 58 ... Electromagnetic actuator circuit, 36 ... Battery 38, second switch, 48 shutter part, 50 charge lever, 52 release lever, 57 manual release button, 59 shutter speed dial, 61 projection, 62 first switch, 63 disconnection switch.

Claims (2)

(57) [Claims] 1. An electromagnetic actuator for releasing a shutter, an electromagnetic actuator for releasing a film winding lock mechanism, an electromagnetic actuator circuit for supplying power to both electromagnetic actuators by operating a shutter button, and a shutter release. Means for manually releasing the film winding lock mechanism without using the shutter button, a projection formed on a rotating member for setting the shutter speed, and when the rotating member moves to the set position for a long time. A switch that is opened by the projection and switches the electromagnetic actuator circuit into a disconnected state. 2. A shutter button operable only when a winding lock mechanism is operated, and a charge lever for manually charging a shutter are provided. In the electromagnetic actuator circuit, the shutter is charged. A first switch that closes when the shutter button is operated, and a second switch that closes when the shutter button is operated, so that both electromagnetic actuators are operated only when both the first and second switches are closed. 2. A shutter drive device for a camera according to claim 1, wherein