JPH0756212A - Shutter mechanism for camera - Google Patents

Abstract

PURPOSE:To provide a shutter mechanism for camera improved so as to more simplify one-layer structure. CONSTITUTION:In the shutter mechanism having shutter blades 3 energized in a closing direction, a charge lever 4 energized in the direction where the shutter blades 3 are opened and driven by a spring means 10 and a holding means for holding the charge lever 4 in a standby position against the energizing force of the spring means 10, the holding means includes an electromagnetic attracting means 6 and the driving means 17 of the means 6, and the driving means 17 includes a timer means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter blade which is biased by a spring in a closing direction, a charge lever which is biased by a spring means in a direction of driving to open the shutter blade, and a biasing force of the spring means. And a holding mechanism for holding the charge lever at the standby position.

[0002]

2. Description of the Related Art As a shutter mechanism having a relatively simple structure, a release lever that interlocks with a shutter button and a charge lever that is biased by spring means to open and drive a shutter blade that is biased by a spring in a closing direction. There is known a kick-off type having a lock lever that holds a charge lever in a standby position. Since this type is compact and lightweight, it is used particularly in popular compact cameras.

On the other hand, a self-timer device for producing a time delay from the time when the shutter button is pressed until the shutter blade actually operates is added to the camera. However, in the conventional mechanical self-timer, a governor mechanism using a gear is used. Is commonly used.

[0004]

However, when the conventional mechanical self-timer device is to be combined with the kick-off shutter mechanism, this is because the structure is relatively complicated and requires a relatively large space for incorporation. However, the compactness and weight reduction that can be achieved by adopting the kick-off type shutter mechanism is canceled by incorporating the self-timer device.

The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to provide an improved camera shutter mechanism so that the structure can be further simplified. To do.

[0006]

According to the present invention, such an object is to provide a shutter blade which is spring-biased in a closing direction and a charge which is biased by a spring means in a direction for driving the shutter blade to open. A shutter mechanism for a camera, comprising: a lever; and a holding means for holding a charge lever at a standby position against the biasing force of a spring means, wherein the holding means is an electromagnetic attraction means and a driving means for the electromagnetic attraction means. Including
This is achieved by providing a shutter mechanism for a camera, characterized in that the driving means comprises a timing means.

[0007]

According to this structure, since the charge lever can be held by the electromagnetic attraction means, it is possible to prevent the charge lever from immediately moving to the position for kicking the shutter blade even if the shutter button is pressed. By demagnetizing the electromagnetic attracting means by the time measuring means, the charge lever can be operated and the shutter blades can be opened after a predetermined time has elapsed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.

1 to 3 show a schematic construction of a shutter mechanism constructed according to the present invention. This shutter mechanism includes a release lever 1 connected to a shutter button (not shown), a shutter blade 3 for opening and closing a light transmission hole 2, a charge lever 4 for driving the shutter blade 3 in an opening direction, and a normal charge. A lock lever 5 for holding the lever 4 in the standby position, an electromagnetic attracting means 6 for holding the charge lever 4 as necessary when the shutter lever is pressed to release the lock lever 5, and a film winding operation. And a charge cam 7 for returning the charge lever 4 to the standby position.

The release lever 1 is vertically slidable, and is always urged upward by a spring 8.

The shutter blade 3 is shaped like a ladle and has a circular head that closes the transmission hole 2. The shutter blade 3 is rotatably supported by the middle portion of the arm and is constantly closed by a spring 9. Biased in the direction.

The charge lever 4 is slidable in the left-right direction, and is constantly urged by a spring 10 to the right in the figure.

The lock lever 5 is pivotally supported in a seesaw type so as to be tiltable, and one end of which is engaged with the release lever 1,
The claw 12 provided at the other end is engaged with the charge lever 4. Further, the spring 11 is biased in a direction in which the engagement of the claw 12 with the charge lever 4 is maintained.

The electromagnetic attraction means 6 is provided at the end of the charge lever 4 that engages with the lock lever 5, and the electromagnet 13 fixed to the main body side and a coil spring that pulls at the end of the charge lever 4. 14 and the iron piece 16 connected via the lock claw 15. The electromagnet 13 is connected to an exciting circuit 17 having a timer circuit built therein.

Next, the operating procedure of the device of the present invention will be described.

In the normal mode, the electromagnet 13 is in the demagnetized state. When the shutter button is pressed in this state, the release lever 1 moves downward to release the engagement between the lock lever 5 and the charge lever 4. Then, the charge lever 4 moves to the spring 10.
Immediately move to the right by the urging force of, to kick off the arm portion of the shutter blade 3. Since the shutter blade 3 is always biased by the spring in the closing direction, the transmission hole 2 is opened only at the moment when it is kicked by the charge lever 4.

When the film is wound up, the charge cam 7
Rotates to return the charge lever 4 to the original position.

In the self-timer mode, when the time is set, the electromagnet 13 is excited and the iron piece 16 at the end of the charge lever 4 is attracted to the electromagnet 13. When the shutter button is pressed in this state, the lock lever 5 is first released in the same manner as above, and the charge lever 4 is moved to the right by the biasing force of the spring 10. However, since the initial displacement amount (x dimension shown in FIGS. 1 and 2) of the charge lever 4 is restricted by the lock claw 15 extended from the iron piece 16, the engagement with the lock lever 5 is released, but The above cannot move (see FIG. 2).

From this state, if the electromagnet 13 is demagnetized and the charge lever 4 is released when the timer circuit completes timing, the spring force causes the charge lever 4 to immediately move to the right. As a result, similarly to the above, the shutter blades 3 are kicked off and the transmission holes 2 are opened (see FIG. 3).

On the other hand, in the red-eye reduction mode in which the flash light is preliminarily emitted before the shutter is actually released when the shutter button is pressed, after the shutter button is depressed, the charge lever 4 moves the electromagnet for an appropriate time required for the preliminary light emission. Held by 13.

Further, if a permanent magnet piece is used in place of the iron piece 16 and the magnetic pole of the electromagnet 13 is set in a direction that repels the permanent magnet piece in the excited state, the core of the electromagnet 13 that is in the demagnetized state is normally used. It is possible to hold the charge lever 4 in the set position by adsorbing it with the permanent magnet piece and to release the charge lever 4 when the electromagnet 13 is excited. According to this structure, since the electromagnet 13 only needs to be excited when the charge lever 4 is released, the consumption of the built-in battery can be significantly reduced.

It should be noted that the release lever 1 and the lock lever 5 are omitted from the above construction, and normally the charge lever 4 is held only by the electromagnetic attraction means 6 (electromagnetic core and permanent magnet piece) and the shutter button is pushed. It is also possible that the electromagnet 13 is excited by and the charge lever 4 is released.

[0023]

As described above, according to the present invention, since a desired time delay can be added to the operation of the shutter with an extremely simple structure, the structure of a popular camera is further simplified, and the size and weight of the camera are reduced. Has a great effect on promoting.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a standby state of a charge lever of a device of the present invention.

FIG. 2 is a schematic configuration diagram showing a state in which a shutter button is pressed while an electromagnet is excited.

FIG. 3 is a schematic configuration diagram showing a state in which the electromagnet is demagnetized.

[Explanation of symbols]

 1 Release Lever 2 Transmission Hole 3 Shutter Blade 4 Charge Lever 5 Lock Lever 6 Electromagnetic Adsorption Means 7 Charge Cam 8-11 Spring 12 Claw 13 Electromagnet 14 Pulling Coil Spring 15 Lock Claw 16 Iron Piece 17 Excitation Circuit

Claims (1)

[Claims] 1. A shutter blade which is spring-biased in a closing direction,
A shutter mechanism for a camera having a charge lever biased by spring means in a direction for driving the shutter blades to open and holding means for holding the charge lever in a standby position against the biasing force of the spring means. The shutter mechanism of a camera, wherein the holding means includes an electromagnetic attraction means and a driving means for the electromagnetic attraction means, and the driving means includes a timing means.