JPH06332037A - Shutter for camera - Google Patents

Abstract

PURPOSE:To provide a shutter for a camera capable of being adapted for a simple camera capable of always stably exposing a film at a stable shutter speed, regardless of quickness in pressing the release button, as well, with a compact device and at a low cost. CONSTITUTION:In the shutter for the camera capable of charging the driving spring 6 of a shutter driving means by the rotary operation of a sprocket 3 by the winding of a film F, a charging lever 5 for charging the driving spring 6 and a kicking plate 8 driving a shutter blade S are provided on the shutter driving means, the charging lever 5 and the kicking plate 8 have slidable engagement relations in a releasing direction and integral engagement relations in the charging direction of the driving spring 6 and the driving spring 6 is attached so as to energize the charging lever 5 in the direction opposite to a releasing position and the kicking plate 8 in the direction for driving the shutter blade S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter used for a camera, and more particularly to a shutter for a simplified camera.

[0002]

2. Description of the Related Art As a shutter used in a conventional simplified camera, a lens having a fixed aperture and a fixed focus and an aperture having a smaller aperture than F8 is used.
A fixed speed of 0 to 1/100 second is used.

FIG. 3 is an example of a shutter used in a conventional simplified camera, and is a perspective view for explaining the operation of the shutter.

In FIG. 3, reference numeral 1 denotes a camera body, in which the film F is moved in the direction of the arrow by the rotation of the winding knob K in the direction of the arrow and is wound into the cartridge P. Then, the sprocket 3 rotates by engaging with the perforation of the film F, and the coaxial charge cam 4 rotates in the arrow direction.

In the state shown in the drawing, the winding of the film F is completed, the tip of the charge lever 5 jumps into the concave portion of the charge cam 4, and the kick plate 51 of the charge lever 5 is also attached to the camera body 1.
The V-shaped projection of the hoisting knob stopper 52 of the charge lever 5 is further engaged with the stopper 9 provided on the lower end of the hoisting knob K and jumps into the V-shaped groove of the crown gear provided on the lower side surface of the hoisting knob K. The state where the rotation of K is stopped is shown.

A portion of the shaft 53 of the charge lever 5 below the charge lever 5 has a cylindrical shape as shown by a broken line, and is fitted with the rotary shaft 7 attached to the camera body 1 as shown in the drawing. The fitting is such that it can be rotated at the same time as sliding in the vertical direction.

A driving spring 6 having the shape shown in the figure is inserted into a lower portion of the shaft 53, and the upper end of the driving spring 6 is attached to the camera body 1.
As shown in the drawing, the spring hooking pin 61 is planted at the lower end and the lower end is locked to the kick plate 51 of the charge lever 5. In this state, the drive spring 6 is compressed downward and simultaneously urges the kick plate 51 of the charge lever 5 counterclockwise.

The shutter blade S is pivotally supported by a rotary shaft S4 planted in the camera body 1, and a spring hook S2 of the shutter blade S and a spring hook pin S planted in the camera body 1.
A shutter spring S1 is stretched between 3 and 3 as shown. Although the shutter blade S is biased counterclockwise, the stop pin S5 implanted in the camera body 1
As a result, the shutter blade S closes the lens opening hole 2 and stops as shown in the figure.

In the above state, the shaft of the charge lever 5
The tip projection of 53 is pushed in the arrow downward direction against the upward bias of the drive spring 6 by a release button (not shown). By this operation, the kick plate 51 of the charge lever 5 is disengaged from the stopper 9, and is rotated counterclockwise by the counterclockwise urging force of the drive spring 6 to kick off the upper portion of the shutter blade S.

By the kicking off by the kicking plate 51, the shutter blade S rotates about the rotation axis S4 against the counterclockwise urging of the shutter spring S1 to open the lens opening hole 2. When the kick plate 51 of the charge lever 5 further rotates and is disengaged from the upper portion of the shutter blade S, the shutter blade S rotates counterclockwise by the spring force of the shutter spring S1 and rotates to abut the stop pin S5 to contact the lens opening hole. 2 will be blocked again. In this way, the exposure / photographing of the film F is performed.

As described above, since the shutter blade S is opened and closed as a matter of course, the spring force of the drive spring 6 is larger than that of the shutter spring S1, but the shutter speed is higher than that of the shutter spring S1. It depends on how much the spring force of 6 is increased.

On the other hand, the tip of the charge lever 5 is
Although it comes off from the recess 42 of the charge cam 4 and enters under the charge cam 4, the charge lever 5 comes into contact with the spring hooking pin 61 to stop the rotation of the charge lever 5.
In this state, the V-shaped protrusion of the hoisting knob stopper 52 of the charge lever 5 is disengaged from the V-shaped groove on the lower surface of the hoisting knob K, so that the hoisting knob K can be wound.

Therefore, the winding knob K is wound in the direction of the arrow and rotated, the film F is again moved in the direction of the arrow to be wound and the sprocket 3 is rotated, and the coaxial charge cam 4 is rotated in the direction of the arrow.

By rotating the charge cam 4 in the direction of the arrow,
The cam 41 contacts the tip of the charge lever 5 to rotate the charge lever 5 clockwise, that is, against the counterclockwise biasing force of the drive spring 6. That is, the drive spring 6 is charged. Then, when the charge cam 4 rotates for almost one rotation, the kick plate 51 of the charge lever 5 stops at the stopper 9.
Rotate to a position just beyond the locking end face of. When the charge cam 4 makes one rotation, the tip end of the charge lever 5 in the recess 42 of the charge cam 4 jumps off the end surface of the charge cam 4 by the upward biasing force of the drive spring 6. Then, the kick plate 51 of the charge lever 5 is brought into contact with the end surface of the stopper 9 and locked by the counterclockwise urging force of the drive spring 6. In addition, the winding knob stopper 52 of the charge lever 5
The V-shaped projection of # 1 again jumps into the V-shaped groove on the lower surface of the hoisting knob K, and stops the hoisting and rotating of the hoisting knob K. This state is also the state shown in the figure. In this way, exposure and photographing of the film F, charging of the drive spring 6 and winding of the film F are performed in this manner.

[0015]

In the conventional shutter configured as described above, there is a large difference in shutter speed between when the photographer presses the release button slowly and when it is pressed quickly. It was

That is, when the release button is pressed slowly, the kick plate 51 kicks the tip of the shutter blade S at the height at which the kick plate 51 is disengaged from the stopper 9. However, when the release button is pushed early, the height of the kick plate 51 is lower than the height when the kick plate 51 is disengaged from the stopper 9 by the time the kick plate 51 kicks the tip of the shutter blade S. The position near the rotation axis S4 of the shutter blade S is kicked off,
Therefore, the shutter blade S opens at a high speed, and the kick plate 51 kicks a position near the rotation axis S4 of the shutter blade S, so that the rotation angle of the shutter blade S becomes large. It will be long. That is, the shutter speed becomes slow.

The effect is that the faster the release button is pressed, the kicker plate 51 kicks the position closer to the rotation axis S4 of the shutter blade S, so that the shutter speed is rapidly decreased. That is, the portion of the shutter blade S above the rotation axis S4 is very short, and therefore even a slight change in the kicking position of the kick plate 51 has a great influence on the opening speed of the shutter blade S and the rotation angle of the shutter blade S. Therefore, the exposure time is greatly affected.

The present invention has been made to solve the above problems. That is, it is possible to provide a low-cost camera shutter with a simple structure that can be applied to a simple camera that can always provide stable exposure to a film with a stable shutter speed regardless of the speed at which the release button is pressed. It is intended.

[0019]

SUMMARY OF THE INVENTION The object of the present invention is to provide a shutter for a camera which charges a drive spring of a shutter drive means by rotating a sprocket by winding a film, and charges the drive spring to the shutter drive means. A charge lever and a kick plate for driving the shutter blade are provided, and the charge lever and the kick plate have a sliding engagement relationship in the release direction and an integral engagement relationship in the charging direction of the drive spring. The spring is attached to the charge lever in a direction opposite to the release direction and to the kick plate in a direction to drive the shutter blades. This is achieved by the shutter.

[0020]

The shutter of the camera constructed as described above is
Unlike the conventional shutter, the charge lever and kick plate are separated, and both are operated integrally only in the rotation direction, so regardless of whether the release button is pressed in the release direction quickly or slowly, It came to kick the shutter blades at a certain position. Therefore, the shutter speed is always stable, and stable exposure of the film can be achieved.

[0021]

Embodiments of the present invention will now be described with reference to the accompanying drawings, FIG. 1 and FIG.

FIG. 1 is a perspective view of an embodiment of a shutter of a camera according to the present invention.

In FIG. 1, reference numeral 1 denotes a camera body, and the film F moves in the direction of the arrow as the winding knob K rotates in the direction of the arrow and is wound into the cartridge P. Then, the sprocket 3 meshes with the perforation of the film F to rotate, and the coaxial charge cam 4 rotates in the arrow direction.

In the state shown in the drawing, the winding of the film F is completed, the tip of the charge lever 5 jumps into the concave portion of the charge cam 4, and the connecting pin attached to the charge lever 5.
54 is removably inserted into the coupling pipe 81 attached to the kick plate 8, so that the charge lever 5 and the kick plate 8 can be integrally rotated about the rotary shaft 7 as an axis. It has stopped in the state. Then, the V-shaped projection of the hoisting knob stopper 52 of the charge lever 5 further jumps into the crown gear-shaped V-shaped groove provided on the lower side surface of the hoisting knob K to stop the rotation of the hoisting knob K. Has become.

A portion of the shaft 53 of the charge lever 5 below the charge lever 5 has a cylindrical shape as shown by a broken line, and is fitted to the rotary shaft 7 attached to the camera body 1 as shown in the drawing. Further, since the connecting pin 54 attached to the charge lever 5 is removably inserted into the connecting pipe 81 attached to the kick plate 8 as described above, it is possible to rotate in the same manner as above while sliding vertically. Fitting is possible.

A drive spring 6 having the shape shown in the figure is inserted into the lower portion of the shaft 53, and the upper end of the drive spring 6 is attached to the camera body 1.
The lower end of the spring hooking pin 61 is fixed to the connecting pipe 81 attached to the kick plate 8 as shown in the drawing. In this state, the drive spring 6 is compressed downward and simultaneously urges the kick plate 8 in the counterclockwise direction.

Further, the shutter blade S is pivotally supported by a rotary shaft S4 planted in the camera body 1, and a spring hook S2 of the shutter blade S and a spring hooking pin S implanted in the camera body 1.
A shutter spring S1 is stretched between 3 and 3 as shown. Although the shutter blade S is biased counterclockwise, the stop pin S5 implanted in the camera body 1
As a result, the shutter blade S closes the lens opening hole 2 and stops as shown in the figure.

In the above state, the shaft of the serge lever 5
The tip projection of 53 is pushed in the arrow downward direction against the upward bias of the drive spring 6 by a release button (not shown). By this operation, the tip of the charge lever 5 is disengaged from the end surface of the recess 42 of the charge cam 4, and the kick plate 8 which is rotatable integrally with the charge lever 5 as described above is urged by the drive spring 6 in the counterclockwise direction. It rotates counterclockwise, and the tip of the kick plate 8 kicks the upper part of the shutter blade S.

Due to the kicking off by the tip of the kick plate 8, the shutter blades S have the shutter spring S centering on the rotation axis S4.
The lens opening hole 2 is rotated against the counterclockwise biasing force of 1.
Open up. When the tip of the kick plate 8 is further rotated and disengaged from the upper part of the shutter blade S, the shutter blade S returns and rotates counterclockwise by the spring force of the shutter spring S1 to come into contact with the stop pin S5 and the lens opening hole 2 It will be blocked again. In this way, the exposure / photographing of the film F is performed.

As described above, since the shutter blade S is opened and closed as a matter of course, the spring force of the drive spring 6 is larger than that of the shutter spring S1, but the shutter speed is higher than that of the shutter spring S1. It depends on how much the spring force of 6 is increased.

On the other hand, the tip of the charge lever 5 is
Although it comes off from the end surface of the concave portion 42 of the charge cam 4 and enters under the charge cam 4, the charge lever 5 contacts the spring hooking pin 61 to stop the rotation of the charge lever 5, and at the same time as the charge lever 5. The kick plate 8 that rotates integrally will also stop. In this state, the V-shaped protrusion of the hoisting knob stopper 52 of the charge lever 5 is disengaged from the V-shaped groove on the lower surface of the hoisting knob K, so that the hoisting knob K can be wound.

Therefore, the winding knob K is wound in the arrow direction and rotated, the film F is again moved in the arrow direction and wound to rotate the sprocket 3 and the coaxial charge cam 4 is rotated in the arrow direction.

By rotating the charge cam 4 in the direction of the arrow,
The cam 41 contacts the tip of the charge lever 5 to rotate the charge lever 5 clockwise, that is, against the counterclockwise biasing force of the drive spring 6. That is, the drive spring 6 is charged. When the charge cam 4 makes one revolution, there is a step of 0.8 mm or more between the end cam surface of the cam 41 of the charge cam 4 and the bottom of the recess 42, and the tip of the charge lever 5 in the recess 42 has the drive spring 6 By the upward biasing force, the charge cam 4 disengages from the end surface of the charge cam 4, jumps up, hits the bottom of the recess 42, and is locked as illustrated. Then, the V-shaped projection of the hoisting knob stopper 52 of the charge lever 5 jumps into the V-shaped groove on the lower surface of the hoisting knob K again, and the hoisting rotation of the hoisting knob K is stopped. This state is also the state shown in the figure. In this way, exposure and photographing of the film F, charging of the drive spring 6 and winding of the film F are performed in this manner.

As can be seen from the above description, in the embodiment according to the present invention, the charge lever 5 and the kick plate 8 are divided into separate parts so that the structure is simple and inexpensive so that the kick button can be pushed regardless of the pressing speed of the release button. The position at which the plate 8 kicks the shutter blade S can always be made constant, so that the shutter speed can always be stable.

As described above, the charge lever 5 for charging the drive spring 6 and the kick plate 8 for driving the shutter blades S are used.
The charge lever 5 and the kick plate 8 are slidably engaged with each other in the release direction and are integrally engaged with each other in the charge direction of the drive spring 6, and the drive spring 6 is opposite to the release with respect to the charge lever 5. Direction, the shutter blade S for the kick plate 8
By urging the shutter in the driving direction, the shutter speed is always stable regardless of the speed at which the release button is pressed.

Another embodiment for maintaining the above-mentioned engagement relationship between the charge lever 5 and the kick plate 8 is shown in FIG.

In FIG. 2, a projection 55 is provided on a portion of the shaft 53 below the charge lever 5, and a projection guide groove 82 for guiding the projection 55 is provided inside the cylindrical portion at the center of rotation of the kick plate 8. The protrusion 55 and the protrusion guide groove 82 are normally the protrusion guide groove.
The projection 55 is guided by the 82 to be slidable. Therefore, when rotating around the rotary shaft 7, the charge lever 5 and the kick plate 8 rotate while maintaining an integral engagement relationship, and when the charge lever 5 operates in the release direction, both are in a sliding engagement relationship. It is possible to operate while maintaining.

[0038]

According to the present invention, a camera having a simple structure and a low cost, which can be applied to a simple type camera which can always give a stable exposure to a film by a stable shutter speed regardless of the pressing speed of a release button. Shutters will be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a shutter of a camera according to the present invention.

FIG. 2 is a perspective view showing another embodiment for maintaining the engagement relationship of the main members of the present invention.

FIG. 3 is a perspective view illustrating a conventional example.

[Explanation of symbols]

 1 Camera Body 2 Lens Opening Hole 4 Charge Cam 41 Cam 42 Recess 5 Charge Lever 51, 8 Kick Plate 52 Winding Knob Stopper 53 Shaft 54 Coupling Pin 55 Protrusion 6 Drive Spring 61, S3 Spring Locking Pin 7, S4 Rotation Shaft 81 Coupling Pipe 82 Projection guide groove 9 Stopper S Shutter blade S1 Shutter spring S2 Spring hook S5 Stop pin F Film

Claims (1)

[Claims] 1. In a shutter of a camera for charging a drive spring of a shutter drive means by rotating a sprocket by winding a film, the shutter drive means drives a charge lever for charging the drive spring and a shutter blade. The charge lever and the kick plate have a sliding engagement relationship in the release direction and an integral engagement relationship in the charging direction of the drive spring, and the drive spring is in relation to the charge lever. The shutter of the camera is mounted so as to urge the shutter blade in a direction opposite to the release direction and to urge the kick plate in a direction to drive the shutter blades.