JPH02207227A - Shutter device - Google Patents

Abstract

PURPOSE:To prevent light from leaking from an exposure opening even when a release lever is returned to its initial position by making the fulcrum of rotation of a coupling part slidable to a base plate so that the rotating force to the opening side of the coupling part is absorbed. CONSTITUTION:A long support hole 34 is formed right below a rectangular opening 30, a pin 36 implanted in a shutter board 12 is inserted, and the coupling member 14 is supported rotatably on the pin 36. The support hole 34 is formed in a long-hole shape, so the coupling member 14 is slidable to the pin 36. Thus, the clockwise rotating force of the coupling member 14 when the exposure opening 22 is closed is absorbed to prevent the exposure opening 22 from being open. Consequently, no light leaks from the exposure opening 22 when the release lever 28 is returned to its initial position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a shutter device used in cameras and the like.

[Conventional technology]

A camera shutter has the role of providing the necessary exposure time to photosensitive materials, and also has the important function of blocking unnecessary light except during exposure.

In recent years, shutters based on various methods have been used.
Low-cost cameras such as compact cameras use shutters with simple mechanical mechanisms. For example, there is a camera that opens and closes an opening formed in a shutter base plate by pushing a projection provided on a shutter blade with a release lever and rotating the shutter blade around a single point.

[Problem to be solved by the invention]

However, in the shutter device with the mechanism described above, when the release lever is returned to its initial position, the lever comes into contact with the protrusion of the shutter blade, and force is applied to this protrusion in a certain direction, causing the shutter blade to move. Sometimes it would rotate in the opening direction. In order to prevent light from leaking from the exposure aperture due to this rotation, the shutter blades must be made larger to provide some extra room.
If such measures are taken, the driving efficiency of the shack blades will deteriorate.

[Purpose of the invention]

The present invention has been made in view of the above points, and provides a light shielding method that prevents light from leaking from the exposure aperture when the release lever is returned to the initial position using a simple structure without unnecessarily increasing the size of the shutter blade. The purpose of the present invention is to provide a shutter device with excellent performance.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention has a connecting part so as to absorb the rotational force toward the opening side applied by contact with a protrusion formed on the connecting part when returning the release lever to the initial position. The pivot point is configured to be slidable relative to the base plate.

[Function] As described above, the present invention has a structure in which the rotational force of the connecting member generated when the release lever returns is absorbed by the sliding movement of the rotational fulcrum of the connecting part, so that when the release lever returns, the exposed opening can be easily prevented from opening.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the configuration of a shutter device 1 according to this embodiment. This shutter device 1 includes shutter blades 10
The shutter board 12 supports the shutter board 12, and the connecting member 14 transmits force to the shutter blades 10.

The shutter blade 10 is formed from a very thin and lightweight plate. One end of the shutter blade 10 has a support hole 1 through which a pin 16 embedded in the shutter board 12 is inserted.
8 is formed, and the shutter blade 10 is rotatably supported by a pin 16 inserted through this support hole 18. By this rotational movement, the shutter blade 10 is moved to the support hole 18.
A shutter opening 22 formed in the shutter board 12 is opened and closed by a light shielding portion 20 formed on the opposite side of the shutter board 12 .

A trapezoidal opening 24 is formed above the support hole 18, and a key portion 26 of the connecting member 14 engages with the opening 24 to lock the connecting member 1.
4 rotational force is transmitted. Note that the side wall of the opening 24 is shaped so that the force applied by the abutment of the key portion 26 of the connecting member 14 is received and stopped by a perpendicular surface. As a result, even if the force of the connecting member 14 acts on the shirt shirt plate 10, which has a weak strength, it will not bend, and the opening/closing operation can always be performed by smooth rotation.

The connecting member 14 is for amplifying the rotational speed of the shutter blade by extending the length of the arm from the point of force application (protrusion 38 described later), and allows the shutter blade 10 to be rotated directly by the release lever 34. The shirt opening 22 can be opened and closed at a speed more than twice as fast as when moving the shirt opening 22.

This connecting member 14 is formed from a thin aluminum plate, and has a rectangular opening 30 formed in a part thereof through which the release lever 28 is inserted, and a triangular protrusion 32 that comes into contact with the release lever 28 formed inside. .

At the time of release, the release lever 28 moves to the right and pushes the protrusion 32, and when returning to the initial state, the release lever 28 moves to the left while contacting the protrusion 32.

An elongated support hole 34 is formed at the lower right of the rectangular opening 30, through which a pin 36 planted in the shutter board 12 is inserted.
The connecting member 14 is rotatably supported around a pin 36. Since the support hole 34 is formed in an elongated shape, the connecting member 14 can slide relative to the pin 36. This absorbs the clockwise rotational force of the connecting member 14 when the exposure opening 22 is covered, and prevents the exposure opening 22 from opening. Further, the position of the support hole 34 is such that the pin 36 comes into contact with the lowest part in the initial state before the shutter is released as shown in the figure, and the connecting member 14 can be rotated well at the time of release. At the same time, the force applied to the connecting member 14 from above can be sufficiently absorbed.

A balancer 37 is connected to the connecting member 14 on the opposite side of the support hole 34.
The connecting member 14 is formed integrally with the shutter board 12 after being released, and buffers the impact when the connecting member 14 collides with a recess 40 of the shutter board 12 (described later) and stops, and the impact causes the connecting member 14 to rotate clockwise and open the shutter. 22 is prevented from opening.

Further, a spring hook protrusion 3B is integrally formed on the upper part of the balancer 37, and a spring 39 is hooked thereon to connect the connecting member 14.
is biased counterclockwise. Note that the direction of tension by this spring 39 is also related to the position of the support hole 34 mentioned above.
The pin 36 is oriented slightly upward so that it can surely come into contact with the lower end of the support hole 34 at the time of release.

A recess 40 for supporting the shutter blade 10 and the connecting member 14 is formed on the surface of the shutter board 12. Further, an arc-shaped opening 42 is formed at a location corresponding to the key portion 26 of the connecting member 14, and an opening 44 through which the release lever 28 is inserted is formed at a location corresponding to the rectangular opening 30.

FIG. 2 shows the appearance of a lens-equipped film unit using the shutter device 1 described above. A film unit with a lens is sold by the applicant under the product name "Utara-nsu Hi" so that even those who do not own a regular camera can easily enjoy taking photographs. This lens-equipped film unit has a simple photographic mechanism built into it, and a unit main body 5 in which 135 film with a cartridge is loaded in advance.
0 wrapped in a paper box 52. The unit main body 50 consists of a main body part 54 and a front cover 56 and a rear cover 58 that cover the main body part 54.

A photographic lens 60 is arranged on the front of the unit main body 50, and a finder opening 62 is formed next to it.

In addition, a shack button 64 is provided on the top surface of the unit body 50.
A counter window 66 is provided, and a film winding knob 68 is provided at the rear.

On the other hand, in the paper box 52, a photographing lens 60. Finder opening 62. Shutter button 64
．． Film counter window 66 and film advance knob 6
An opening is formed to expose B to the outside. This allows the unit to be operated while it is in the paper box 52.

The lens-equipped film unit configured in this way is
After taking a picture, you can simply submit it to a processing shop without any troublesome film rewinding operations. On the other hand, even in photo labs, all that is required is to disassemble or destroy the main body of the unit and take out the cartridge containing the exposed film, and this work can be done in a bright room.

FIG. 3 shows the internal structure of the lens-equipped film unit and the arrangement of the shutter device 1 used therein.

The main body portion 54 includes a cartridge chamber 7 for storing a cartridge.
2 and a film roll chamber 74 for storing unexposed film.
is formed so that the film pulled out from the film roll chamber 74 is rolled into the cartridge after being exposed.

Such film transport is performed by the aforementioned film winding knob 68 and a sprocket (not shown) interlocking with the film winding knob 68. That is, when the film winding knob 68 is rotated counterclockwise, the sprocket engaged with the perforation gin of the film simultaneously rotates, and the film is sent from the film roll chamber 74 to the cartridge chamber 72 side.

When the film advance for one frame is completed, the counterclockwise rotation of the film winding knob 6 is blocked, and the counter gear 76 rotates once to rotate the counter plate 78.
Rotate by one division.

The above-mentioned release lever 34 is attached to the shaft of the counter plate 7B, and when the shutter is charged, it moves to the left in conjunction with the counter plate 78, and the shutter button 6
When you press 4, it moves to the right.

Further, the main body portion 54 is provided with two mirrors (a first mirror 80 and a second mirror 82) that make the photographing optical axis Z-shaped.
The first mirror 80 is arranged almost directly above the film at the exposure position, and the second mirror 82 is arranged almost directly below the photographing lens 60. The first mirror 80 and the second mirror 82 are pressed from behind by a mirror presser 84 and a mirror presser 88 of the holding member 86, respectively.

The aperture barrel 92 held in the aperture frame 90 has a double aperture, which limits the aperture diameter of the photographic lens 60 and prevents oblique light from becoming stray light in the dark box and lowering the contrast of the image. I'm here. The above-mentioned shutter device 1 is arranged in front of this aperture tube 92.

In addition to the mirror holder 88, the holding member 86 is integrally formed with a lens holder 94 for holding a photographic lens and a support plate 96 for supporting a shutter device. Further, a projection 98 for a spring hook is formed at one end of the mirror holder 88, and the spring 35 is hung between this projection 98 and the projection 33 of the shutter blade 10.

Next, the operation and effect of the shutter assembly W1 configured as above and the lens-equipped film unit using the same will be explained.

First, when the shutter button 64 is pressed in the initial state where the film is charged, the release lever 28 moves to the right, and the protrusion 32 formed in the rectangular opening 30 of the connecting member 14 is moved to the right by the tip of the release lever 28. The connecting member 14 rotates clockwise about the pin 36 against the force of the spring 39. When the connecting member 14 rotates clockwise, rotational force is transmitted from the lock portion 26 to the shutter blade 10, the shutter blade 10 rotates clockwise around the pin 16, and the shutter opening 22 opens.

Then, when the tip of the release lever 28 moves to the right side of the protrusion 32, the connecting member 14 and the shutter blade 10 are rotated counterclockwise by the force of the spring 39, and the side surface of the connecting member 14 is brought into contact with the recess 40 of the shutter board 12. Collision and stop. This blocks the shirt opening 22. Although the operation of the release lever 34 has been explained in detail above, the actual opening and closing of the shutter opening 22 is an instantaneous operation (for example, 1/100 seconds).
Needless to say, it is.

On the other hand, when the shirt flap opening is opened, the shirt flap opening 22
The light that has passed through passes through the aperture tube 92 and enters the first mirror 80 . The light incident on the first mirror 80 is reflected here and incident on the second mirror 82. After being reflected by the second mirror 82, the light is incident on the film at the exposure position, and exposure is performed.

Thereafter, when the film advance knob 68 is rotated in preparation for the next photograph, the release lever 28 moves to the left in conjunction with the rotation of the counter plate 78, and the tip of the release lever 28 pushes the protrusion 32 of the connecting member 14. Move over it. At this time, a downward force is inevitably applied to the protrusion 32, and the connecting member 14 slides downward along the elongated support hole 2. As a result, the connecting member 14, which is normally urged to rotate clockwise, does not rotate because the force is absorbed. After that, the tip of the release lever 28 is connected to the protrusion 32.
At the same time, the connecting member 14 is pulled upward by the force of the spring 39, and the pin 36 is moved to the left side of the support hole 3.
4 and returns to the initial state.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and the connecting member 14
It is also possible to directly rotate the shutter blade without using the shutter blade.

Note that in this case, it is necessary to increase the strength of the shutter blade to some extent.

Further, in the above embodiment, in order to rotatably support the connecting member 14 on the shutter board 12, the pin 36 is installed in the jack board 12, and the supporting hole 34 is formed in the connecting member 14. Alternatively, a pin may be implanted in the connecting member 14 and an elongated support hole may be formed in the shutter board 12.

〔Effect of the invention〕

As explained above, in the present invention, the rotation fulcrum of the connection part is configured to be slidable with respect to the base plate so as to absorb the rotational force of the connection part toward the open side.
Even when the release lever is returned to the initial position, no light leaks from the exposure opening, and the light-shielding property is improved, which is a special effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a shutter device according to an embodiment of the present invention. FIG. 2 is a perspective view showing the appearance of a lens-equipped film unit using the shutter device according to the embodiment. FIG. 3 is a perspective view showing the internal structure of a lens-equipped film unit using the shutter device according to the embodiment.・Shutter blade, shutter board, connecting member, light shielding part, shutter opening, release lever, protrusion, support hole.

Claims (1)

[Scope of Claims] Consisting of a base plate having an exposed opening in part, a light-shielding part that shields the exposed opening of the base plate, and a connecting part connected to the light-shielding part and rotatably supported by the base plate. By pushing the protrusion provided on this connecting part with the release lever that is driven at the time of release and rotating the connecting part,
In the shutter device that opens and closes the exposure opening, the connecting portion is rotated so that the rotational force applied to the connecting portion toward the opening side is absorbed by contact with the protrusion when the release lever returns to the initial position. A shutter device characterized in that a fulcrum is configured to be slidable with respect to a base plate.