JPS5814341Y2 - camera guide - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a camera shutter opening/closing device.

When applying a shutter of the type that sequentially operates the opening button and closing blade to operate the shutter exposure to a miniaturized camera, the direction of the miniaturized part, i.e., the viewfinder eyepiece in a single-lens reflex camera, is As a method for reducing the space of the blades due to the height of the shutter, etc., which is limited by the height of the shutter, a method of subdividing each blade is known.

However, when each blade is subdivided by the above method, the light shielding property is reduced due to the reduction in the adhesion between each blade or the overlapped portion.To solve this problem, the same applicant has In Japanese Patent Application No. 50-57100, he proposed a method in which one of the blades is allowed to return to its original position after the exposure operation is completed to assist in shielding light.

The present invention improves the method of the prior application, and aims to propose a simplified shutter for small cameras.

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

In Figure 1, the shutter opening for film exposure (
Each member shown in the figure is supported on a substrate provided with a (not shown).

The opening member 1 is rotatably supported by a shaft 1a, and includes a curved portion 1b at the right end, an arcuate projection 1c, and a hook portion 1d at the center.

The driving member 2b has a pin 2a fixed thereto, is biased by a rightward turning force by a spring 2b acting on the pin 2a, and is fitted into the shaft 1a.

Further, the other end of the spring 2b is fixed with a fixing pin 2c.

On the right side of the drive member 2, there is a charging protrusion 2d and a curved portion 2.
e is formed, and a cam 2f is formed on the outer periphery.

A connecting pawl 3 is rotatably supported on the driving member 2 by a shaft 3a, and has a downwardly curved portion 3 penetrating a part of the driving member 2.
b has a shape that engages with the hook portion 1d of the opening member 1 and includes a projection 3c at the left end, and is biased by a right-hand swing spring (not shown).

The interlocking member 4 is fitted into the shaft 3a, and the right end portion 4a is connected to the curved portion 1.
b, and the left end portion 4b is formed slightly retreating from the projection 3c.

The opening claw 5 is rotatably supported by a shaft 5a, the hook portion 5b engages with the curved portion 1b, and a left turning spring (not shown) is biased.

Since the spring 2b of the drive member 2 acts on the hook portion 1d via the connecting claw 3, the curved portion 1b is locked to the opening claw 5 against the spring 2b.

The closing member 6 is rotatably supported on a shaft 6a and is supported by a spring 6b.
The right turning force is applied by this.

A pin 6c protrudes from the drive member 6, and a vibro d is fitted with a gap therein. A spring 6b acts on the outer periphery of the vibro d, and its free end 6e is bent to engage another pin 6f. There is.

The other end of the spring 6b is fixed to a fixing pin 6g.

Further, the vibro d protrudes into the operating range of the cam 2f of the drive member 2.

The upper right end of the closing member 6 has a hook portion 6h, a stop portion 61, and a recess 6.
j is formed.

The closing wind gamma is rotatably supported by a shaft 7a, and a right-hand swing spring (not shown) is biased.

Further, the lower curved portion 7c locks the hook portion 6h, and the upper curved portion 7d
is provided.

The set lever 8 is rotatably supported by a shaft 8a, has a cam portion 8b and a hook-shaped locking portion 8c, and is biased by a left turning spring (not shown).

Further, an integrally formed elastic pipe 8d is fixed below.

Next, the method of operation will be explained.

From the state shown in FIG. 1, when the opening claw 5 is turned to the right against the spring in relation to the shirt release, the hook portion 5b is moved to the bent portion 1.
Unlock b.

When the release member 1 is released from the curved portion 1b, the connecting claw 3
Since it is integrally and operatively connected to the drive member 2 via the spring 2b, it is rotated to the right by the spring 2b to open an opening (not shown) and start exposure.

At the end of the operation of the drive member 2, the curved portion 2e engages with the locking portion 8c of the set lever 8.

The set lever 8 is turned to the right against the spring, and then the arcuate projection 1c engages with the elastic pipe 8d, and the via'8
d is compressed and deformed, the set lever 8 integrated therewith is turned to the left, and the curved portion 2e is locked by the recess of the locking portion 8c.

At the same time as the arcuate projection 1c engages with the elastic pipe 8d,
The charging protrusion 2d presses the cam portion 8b to turn the set lever 8 to the left.

Therefore, the release member 1 is decelerated by the engagement with the locking part 8c, the elastic pipe 8d, and the cam part 8b in the operation end region, and is locked in the recess of the locking part 8c, so it runs at high speed. This prevents the button from bouncing back to the stop position after pressing the button.

Further, although not shown, another stopping device is provided for regulating the operating end position of the opening member 1.

FIG. 2 shows the state in which the opening member 2 has been activated. By a known method, when the desired exposure time has elapsed, the curved portion 7d of the closing wind 1 is rotated to the left against the spring, and the lower curved portion 7c releases the hook portion 6h.

When the locking of the hook portion 6h is released, the closing member 6b is rotated to the right by the spring 6b to close the opening (not shown) and complete the exposure.

When the button is pressed at the end of operation of the closing member 6, the vibro d engages with the protrusion 3c of the connecting claw 3, and the connecting claw 3 is turned to the left around the shaft 3a to engage the curved portion 3b and the hook portion 1d. and release the connection between the opening member 1 and the driving member 2.

When the closing member 6 further pivots, the vibro d engages with the left end 4b of the interlocking member 4, rotates the interlocking member 4 to the left around the shaft 3a, presses the curved portion 1b with the right end 4a, and presses the opening member 1. Turn to the left and displace it again in the direction of closing the opening.

When the vibro d returns to the opening member 1 via the interlocking member 4 to close the opening again, the closing member 6 has already closed the opening, so it does not affect the exposure operation and the recess 6
j comes into contact with the outer periphery of the shaft 5a, and the operation of the closing member 6 is completed.

With the above operation, the -th shutter operation is completed, but in order to charge the shutter again, the set lever 8 must be pressed.
around the shaft 8a to the right against the spring, and the locking part 8
After c releases the bending portion 2e, the cam portion 8b engages with the protrusion 2d to rotate the drive member 2 to the left against the spring 2b, and at the same time, the cam portion 2f engages with the vibro d, causing the vibro d to rotate. axis 6
Turn left around a.

The vibro d presses the spring 6b, and the free end 6e touches the pin 6.
Press f to turn the closing member 6 to the left around the axis 6a.

When the set lever 8 is further turned to the right, the driving member 2 and the closing member 6 are turned to the left due to the above relationship.
When the set lever 8 is at the end of operation, the curved portion 3b is locked to the curved portion 1d, the curved portion 1b of the opening member is locked to the curved portion 5b of the opening claw 5, and the curved portion of the closing member is locked. After the portion 6h is locked to the curved portion 7c, the set lever 8 returns to the first position.
It will be in the state shown in the figure.

FIG. 3 is an explanatory diagram of main parts showing another embodiment, in which the connecting claw 3 is eliminated by forming a curved portion 40c in the interlocking member 40, and the state of the driving member 2 in FIG. It corresponds to

The method of operation is similar to the above embodiment, in which the vibro d engages with the left end portion 40b and rotates the interlocking member 40 to the left against the spring at the end of the operation of the closing member 6, so that the bending portion 40c 1
After releasing the lock of d, the right end portion 40a is connected to the curved portion 1 of the release member.
Press b to move the opening member 1 back in the direction of closing the opening.

The charging method will be omitted since it can be easily deduced from the above embodiments.

In the above embodiment, the opening pawl locks the opening member at the charging position, but it is also possible to lock the driving member.

It is also possible to provide the interlocking member and the connecting pawl on the opening member, or it is also possible to provide either one on the opening member.

Furthermore, in order to make the return movement of the opening member more reliable, it is also possible to apply a return movement spring to the opening member, and also to apply a spring force to the interlocking member.

As is clear from the above explanation, after the exposure operation is completed in the closing member's operation end region, the opening member returns instantaneously.
Even if the closing member bounces due to rapid deactivation, the opening is covered by the opening member.
There is no re-exposure, and since the closure member impacts the interlocking member, the closure member is decelerated to reduce bounce.

Further, since the opening member can be returned to its original state by the power of the closing member without requiring power for returning, the opening member is simplified and manufacturing costs are reduced.

In addition, by allowing the opening member to return, even if the light shielding effect when covering the opening with the closing member is relatively insufficient, it is supplemented by the opening member. This means that the accommodating portion of the opening covering member of the closing member can be made smaller.

As described above, according to the present invention, it is possible to provide a compact and simple shutter.

[Brief explanation of drawings]

The figures show an embodiment of the present invention; FIG. 1 shows a charged state, FIG. 2 shows an open state, and FIG. 3 is a partial view of another embodiment. In the figure, 1 is an opening member, 2 is a driving member, 3 is a connecting pawl, 4 is an interlocking member, 5 is an opening pawl, 6 is a closing member, 7 is a closing pawl, and 8 is a set lever.

Claims (1)

[Scope of Claim for Utility Model Registration] The opening button and the closing blade sequentially open and close the opening to perform the exposure operation, and after the end of the exposure operation, only the opening blade is displaced in the charging direction, and the closing blade an opening member for opening and closing an opening blade by pressing a button on a camera shutter that additionally covers at least a portion of an opening to be covered; a closing member for opening and closing a closing blade; and the opening member. It has driving force for opening operation. a driving member; one end portion that is rotatably supported on the driving member, connects the opening member and the driving member during an opening operation, and is pressed by the closing member in an operation end region of the closing member; an interlocking member having a second end for rotating the opening member, and in the end region of the exposure operation, one end of the interlocking member is pressed and rotated by the closing member, and the opening member and the After the connection with the driving member is released, the other end of the interlocking member presses the opening member to displace it in the charging direction in conjunction with the operation of the closing member. shutter opening/closing device.