JP2001281723A - Shutter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shutter device with which the opening of a sector at a non-photographing time is reliably prevented with a simple structure without increasing the number of components by preventing the opening of the sectors by using an aperture regulating member. SOLUTION: This shutter device to open and close the sectors 6 by the actuation of a plunger 17 through a ring member 5 is provided with a lever member 21 and a suspending member 31 which are extended and withdrawn to/from the moving range of the ring member 5 and regulate the diameter of the opening of a shutter if necessary at a photographing time and by which the sectors 6 are brought into a totally closed state by an operation following aperture regulation at the non-photographing time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device used for a photographing optical system such as a camera.

[0002]

2. Description of the Related Art Conventionally, as a shutter device used in a photographing optical system such as a camera, as described in Japanese Patent Application Laid-Open No. 3-107132, a shutter device provided with a shutter blade also serving as an aperture in a lens group is known. Are known. This shutter device is provided with a drive lever that drives the opening and closing of the shutter blade to change the opening diameter of the shutter blade, and rotates the drive lever according to the focal length of the zoom lens to set the proper aperture opening diameter. It is trying to get.

Further, as described in Japanese Patent Application Laid-Open No. 63-164727, an opening spring for urging the shutter blade in the opening direction, a holding plunger for holding the shutter blade in a closed state, and an open shutter There is known a device provided with a closing drive plunger for returning a blade to a closed position against an opening spring. This shutter device is intended to prevent the shutter blades from opening by a holding plunger.

Further, as described in Japanese Patent Application Laid-Open No. 10-3107, a shutter device having two shutter blades and operating the shutter blades by driving an electromagnetic plunger is provided. There is known a structure in which one of them is heavier than the other and the shutter blades are not easily opened even when subjected to an impact such as a drop.

[0005]

However, in the shutter device described in Japanese Patent Application Laid-Open No. 3-107132, there is a possibility that the shutter blades may be opened due to an impact such as dropping, resulting in erroneous exposure.

In this case, the above-mentioned Japanese Patent Application Laid-Open No. 63-16472 is disclosed.
It is conceivable to provide a holding plunger and a closing drive plunger so as not to open the shutter blades as in the shutter device described in Japanese Patent Application Publication No. 7-74, but if the number of installation of the plungers increases, the component cost increases. This results in a large shutter device.

In order to prevent the shutter blades from opening as in the shutter device described in Japanese Patent Laid-Open No. 10-3107, the number and arrangement of the shutter blades is limited, and the design of the shutter device is limited. The degree of freedom is low.

Accordingly, the present invention has been made to solve such a problem, and a shutter capable of reliably preventing the shutter blades from opening during non-photographing with a simple structure without increasing the number of parts. It is intended to provide a device.

[0009]

In order to achieve the above object, a shutter device according to the present invention comprises a shutter device for opening and closing a shutter blade via a shutter blade driving member by operating an electromagnetic actuator. An opening regulating member is provided which enables the driving member to move in and out of the moving range, regulates a shutter opening diameter as required during photographing, and fully closes the shutter blades by a continuous operation with opening regulation when not photographing. And

A shutter device according to the present invention is a shutter device that opens and closes a shutter blade by the operation of an electromagnetic actuator. And an opening regulating member for bringing the shutter blades into a fully closed state by an operation continuous with the above.

Further, the shutter device according to the present invention is characterized in that the electromagnetic actuator is a plunger.

According to these inventions, at the time of non-shooting, the aperture regulating member enters the moving range of the shutter blade driving member or the shutter blade to prevent the movement of the shutter blade driving member or the shutter blade. For this reason, even when the movable portion of the electromagnetic actuator can move due to an impact or the like, it is possible to reliably prevent the shutter blade from opening.

Further, the opening of the shutter blade can be prevented by the opening restricting member at the time of non-photographing, and can be performed by an operation which is continuous with the opening restricting operation of the opening restricting member. Therefore, the opening of the shutter blades can be prevented with a simple structure without increasing the number of parts other than the opening regulating member.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same elements are denoted by the same reference numerals, and the description is omitted. Also, the dimensional ratios in the drawings do not always match those described.

(First Embodiment) FIG. 1 shows a shutter device according to this embodiment. FIG. 1 is a front view of the shutter device 1 according to the present embodiment as viewed from the subject side, and shows the shutter device 1 when the shutter blades 2 are fully closed. As shown in the figure, the shutter device 1 is used for a photographing optical system such as a camera, and includes a plate-shaped main body 2 having a circular outer shape and a back plate 3. Body 2
Are arranged on the subject side of the back plate 3. An opening 4 is formed at the center of the main body 2 and the back plate 3.

A ring member 5 and shutter blades 6 are provided between the main body 2 and the back plate 3. The ring member 5 is
It functions as a shutter blade driving member that opens and closes the shutter blades 6 by rotational movement, and is disposed so as to surround the opening 4 and is installed rotatably around the opening 4. The shutter blade 6 is a member that opens and closes the opening 4,
For example, three are provided at equal intervals in the circumferential direction of the main body 2. The shutter blade 6 is supported by a pin 7 protruding from the main body 2, and is rotatable around the pin 7.

A long hole 8 is formed in the shutter blade 6, and a pin 9 projecting from the ring member 5 is inserted into the long hole 8. Therefore, when the ring member 5 rotates, each shutter blade 6 rotates around the pin 7 to open and close the opening 4. For example, the elongated hole 8 is formed so that the shutter blade 6 is opened when the ring member 5 rotates clockwise when viewed from the subject side.

A long hole 10 is also formed in the ring member 5, and a pin 12 of a lever 11 is inserted into the long hole 10. The lever 11 is a rod-shaped member arranged on the subject side of the main body 2 and is attached rotatably around the center thereof. A pin 12 protrudes from one end of the lever 11, a protrusion 13 protrudes from the other end, and a shaft pin 14 protrudes from a position between the pin 12 and the protrusion 13.

The shaft pin 14 is supported by the main body 2, and the lever 11 can rotate around the shaft pin 14. The convex portion 13 is in contact with the movable portion 15 of the plunger 17.
The lever 11 is urged clockwise by a torsion spring 16. That is, an annular portion of the torsion spring 16 is attached to the shaft pin 14, one end of the torsion spring 16 is engaged by the engaging portion 11 a protruding from the lever 11, and the other end is protruding from the main body 2. The torsion spring 16 presses the locking portion 11a, and the lever 11
Is urged clockwise about the shaft pin 14. The projection 13 of the lever 11 is pressed by the movable portion 15 by the bias of the lever 11.

The plunger 17 is of an electromagnetic type.
It operates in response to the control signal to move the movable portion 15 forward and backward. A coil spring 15a is attached to the movable section 15. The movable portion 15 is urged by the coil spring 15a in a protruding direction.

On the subject side of the main body 2, there are provided a lever member 21 and a latching member 31 which constitute an aperture regulating member. The lever member 21 is configured by projecting a lever portion 23 on the outer periphery of a cylindrical rotating portion 22. The rotating unit 23
It is rotatably attached to a shaft pin 24 protruding from the main body 2.

The hooking member 31 is configured by projecting a hooking portion 33 on the outer periphery of a cylindrical rotating portion 32. Rotating part 32
Is rotatably attached to a shaft pin 34 protruding from the main body 2. A large number of teeth 35 are formed on the rotating portion 32 along the circumferential direction, and mesh with the teeth 25 formed on the rotating portion 22 of the lever member 21. Therefore, when the rotating part 22 of the lever member 21 rotates, the rotating force of the rotating part 22 is transmitted to the rotating part 32 of the locking member 31 via the teeth 25 and the teeth 35.

The hook 33 protrudes from the rotating part 32 and has a hook pin 36 at the end thereof. The locking pin 36 extends through the notch 37 of the main body 2 to a position between the main body 2 and the back plate 3, and moves into and out of the movement range of the ring member 5 by swinging of the lever part 23, Part 23
The ring member 5 in accordance with the position of the shutter
To prevent the shutter blade 6 from opening.

The ring member 5 has a first latching side 41 and a second latching side 42 at positions where the latching pins 36 extend. The first latching side 41 and the second latching side 42 are formed by cutting out the outer periphery of the ring member 5, and are arranged side by side along the moving direction of the latching pin 36. The first latching side 41 is a side on which the latching pin 36 latches when the shutter blade 6 is prevented from opening halfway or more. The second locking side 42 is a side on which the locking pin 36 locks when the shutter blade 6 is fully closed. For this reason, the second hanging side 42 is formed on the opening side (the clockwise side in FIG. 1) in the rotational movement direction of the ring member 5 with respect to the first hanging side 41.

Next, the operation of the shutter device according to this embodiment will be described.

As shown in FIG. 1, at the time of non-photographing, the movable portion 15 of the plunger 17 is in an extended state,
The ring member 5 is rotating counterclockwise when viewed from the subject side via 1. Therefore, each shutter blade 6 is rotated clockwise through the pin 9 of the ring member 5, and closes the opening 4.

At this time, the lever portion 23 is set to the position where it is rotated counterclockwise, the latch portion 33 of the latch member 31 is rotated clockwise, and the latch pin 36 is moved to the second latch of the ring member 5. It contacts the side 42. The contact of the locking pin 36 prevents the ring member 5 from rotating clockwise and prevents the shutter blade 6 from opening.

In this case, even if an impact is applied to the shutter device 1, the ring member 5 does not rotate due to the locking of the locking pin 36, so that the shutter blade 6 does not open.

In this state, when a photographing operation such as a shutter release is performed, the shutter opening diameter is set according to the photographing condition, and the lever portion 23 rotates accordingly. As a result, the lever member 21 and the latch member 31 rotate, and the latch pin 37 retreats from the position of the first latch side 41 or the moving range of the ring member 5.

As shown in FIG. 2, when the shutter opening diameter is restricted during photographing, the locking pin 37 is
Move to position 1. For this reason, even if the plunger 17 is actuated in response to the photographing operation and the movable portion 15 moves in the retracting direction, the first latching side 41 is latched on the latching pin 36, and the ring member 5 is moved to that position. Only rotates. Therefore, the opening of the shutter blade 6 is restricted by the rotation restriction of the ring member 5, and the shutter opening diameter becomes smaller than when the shutter member 6 is fully opened.

On the other hand, as shown in FIG. 3, when the shutter opening diameter is not regulated at the time of photographing, the locking pin 37 moves to a position outside the moving range of the ring member 5. For this reason, the plunger 17 operates according to the photographing operation, and the movable portion 1 is moved.
When the member 5 moves in the retracting direction, the ring member 5 rotates without being locked by the locking pin 36. Accordingly, the rotation of the ring member 5 also causes the shutter blade 6 to open greatly, and the shutter opening diameter becomes fully open.

As described above, according to the shutter device 1 according to the present embodiment, the locking member 31 constituting the opening restricting member is locked to the second locking side 42 of the ring member 5 during non-photographing. The member 5 is prevented from rotating in a direction to open the shutter blade 6. Therefore, even when the movable portion 15 of the plunger 17 can move due to an impact or the like, the ring member 5
Is prevented from rotating, and the shutter blade 6 can be reliably prevented from opening.

The opening of the shutter blade 6 during non-photographing can be prevented by the locking member 31 constituting the opening restricting member, and can be performed by an operation that is continuous with the operation of restricting the opening of the locking member 31. Therefore, the opening of the shutter blades can be prevented with a simple structure without increasing the number of parts other than the opening regulating member.

In this embodiment, the shutter device 1 in which the opening regulating member is constituted by the two members of the lever member 21 and the latch member 31 has been described, but the shutter device according to the present invention is limited to such a member. However, the opening regulating member may be configured by one member.

(Second Embodiment) Next, a shutter device according to a second embodiment will be described.

In the shutter device according to the first embodiment, the opening restricting member such as the latching member 31 can be moved in and out of the moving range of the ring member 5 which is a shutter blade driving member. The shutter device according to the present invention is not limited to such a device, but may be one in which the opening regulating member can enter and exit the moving range of the shutter blade.

Even in this case, the same operation and effect as those of the shutter device according to the first embodiment can be obtained.

[0038]

As described above, according to the present invention, at the time of non-photographing, the aperture regulating member enters the moving range of the shutter blade driving member or the shutter blade to prevent the movement of the shutter blade driving member or the shutter blade. For this reason, even when the movable portion of the electromagnetic actuator can move due to an impact or the like, it is possible to reliably prevent the shutter blade from opening.

Further, the opening of the shutter blade can be prevented by the opening restricting member at the time of non-photographing, and the operation can be performed by an operation continuous with the opening restricting operation of the opening restricting member. Therefore, the opening of the shutter blades can be prevented with a simple structure without increasing the number of parts other than the opening regulating member.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a shutter device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of the shutter device of FIG. 1;

FIG. 3 is a diagram illustrating the operation of the shutter device of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shutter device, 5 ... Ring member (shutter blade driving member), 6 ... Shutter blade, 17 ... Plunger (electromagnetic actuator), 21 ... Lever member (opening regulating member),
31: Hook member (opening regulating member).

Claims (3)

[Claims] 1. A shutter device for opening and closing a shutter blade via a shutter blade driving member by actuation of an electromagnetic actuator, wherein the shutter blade driving member can be moved in and out of a movement range thereof, and a shutter opening diameter is regulated as required during photographing. And a shutter device for closing the shutter blades in a fully closed state by an operation that is continuous with the opening control during non-shooting. 2. A shutter device for opening and closing a shutter blade by an operation of an electromagnetic actuator, wherein the shutter blade can move in and out of a moving range of the shutter blade, and regulates a shutter opening diameter during photographing, and performs an operation continuous with the opening regulation during non-photographing. A shutter device comprising an opening regulating member for bringing the shutter blades into a fully closed state. 3. The shutter device according to claim 1, wherein the electromagnetic actuator is a plunger.