JP2502402Y2 - Camera shutter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a shutter device for a kick-off type camera.

[Conventional technology]

The applicant has provided a lens-fitted film unit (such as the product name "Sharunune Hi") so that the user can easily take a photograph even when he / she does not carry a camera. The lens-fitted film unit is a disposable camera in which the film is stored in advance, and the cost is significantly reduced as compared with a normal camera by making the main parts plastic and reducing the number of parts.

Among the disposable cameras such as the lens-fitted film unit, the Kodak panoramic camera (trade name) is known. This camera uses a wide-angle lens with a focal length of about 25 mm as a shooting lens, and shooting is performed through a 12 × 36 mm horizontally long aperture. Then, at the time of printing, printing is performed at a magnification ratio of twice that of a normal service print, and a horizontally long panoramic print is created.

In the camera described above, a wide-angle lens having two lenses is used as a photographing lens for panoramic photographing, and the mutual distance between these lenses is kept constant by a distance ring. Further, since the principal point of the photographing lens is located between these lenses, a diaphragm plate that determines an exposure aperture (aperture aperture) and shutter blades that open and close the exposure aperture are provided between these lenses. Has been. As shown in FIG.
The shutter blade 85 has a V-shaped bent shape, and one end 86 of the shutter blade 85 is pivoted when it is flipped by a kick lever 87.
It swings around 91, and the opening / closing plate 88 at the other end opens the exposure opening 89.
Open and close. The arm portion from the bent portion 90 for forming the V-shape to the opening / closing plate 88 has an arc shape centered on the shaft 91, and therefore the notch in the spacing ring 92 is as narrow as the width of the arm portion. Just by providing 93, the shutter blade 85
Can be swung.

[Problems to be solved by the device]

However, although the shutter blade 85 has the advantage that it can be molded as a single component, there is a bend between the shaft 91 and the opening / closing plate 88.
Since it has an elongated shape including 90, there is a drawback in that the opening / closing plate 88 side is likely to swing in the optical axis direction due to the impact when the one end 86 is kicked by the kicking lever 87. Therefore, the end of the opening / closing plate 88 rubs against the diaphragm plate having the exposure opening 89 or the lens arranged in front of the spacing ring 92, which causes uneven exposure.

[Purpose of device]

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and provides a shutter device for a camera in which a V-shaped shutter blade is driven by a kicking method while preventing the shutter blade from swinging in the optical axis direction. The purpose is to provide.

[Means for solving the problem]

In order to achieve the above object, the present invention has a V-shaped shutter blade that swings on the front surface of an opening member to open and close an exposure opening, and one end of the shutter blade is inserted into a moving path of a kicking lever. A drive lever engaged from the front side to an engaging portion provided in the bent portion is used, and the other end side of the drive lever is configured to overlap at least a part from one end side of the shutter blade to the bent portion from the front side. I am doing it.
Then, the movement of the kick-off lever is transmitted to the shutter blade via the drive lever, and the shake of the shutter blade in the optical axis direction is restricted by the front surface of the opening member and the rear surface of the other end of the drive lever. Is.

[Action]

One end of the drive lever is flipped by the movement of the kick-off lever, and the drive lever swings. Since the other end of the drive lever is engaged with the V-shaped bent portion of the shutter blade from the front side, when the drive lever swings, the shutter blade also swings and the opening / closing plate swings to the front surface of the opening member. Open and close the exposure opening. Since the other end of the drive lever overlaps at least part of the shutter blade from the one end side to the bent portion from the front side, when the shutter blade swings, the shake of the shutter blade in the optical axis direction is caused by the front surface of the opening member. It is regulated by the other end side back surface of the drive lever.

Hereinafter, the present invention will be described with reference to the embodiments illustrated in the accompanying drawings.

〔Example〕

FIG. 3 shows the appearance of a film unit with a lens using the present invention.
Comprises a unit body 3 and a paper box 4 covering the unit body 3. An opening is formed in a required portion of the paper box 4, and in addition to the taking lens 5 provided in the unit body 3, a viewfinder objective window 6, a shutter button 7, a counter window 8, a winding dial 9, and a fingerhold 10 are provided. It is exposed to the outside. The lens-fitted film unit 2 is photographed with a screen size of 12 × 36 mm for creating a panoramic photograph, as described later in detail. Reference numeral 11 represents a lens hood integrated with the front surface of the unit body 3.

A first showing a cross section of a main part of the film unit with lens 2
In FIG. 2 and FIG. 2 showing the disassembled state,
The unit main body 3 includes a main body portion 12, a front cover 13, and a rear cover 14. A film roll chamber 15 and a cartridge chamber 16 are provided in the main body 12 so as to sandwich the exposure frame formed on the back side thereof.
Are provided. A film 18 drawn from a cartridge 17 is stored in a roll form in the film roll chamber 15, and a winding dial 9 is provided on the film chamber 16 and is rotated counterclockwise to rotate the film. 18 can be wound around the cartridge shaft 17a.

The main body 12 has a sprocket that is partially exposed on the back surface and engages with the perforation of the film 18,
A shutter driving mechanism 26 including a kick lever 24 and a counter disk 25 is incorporated. Then, when the winding dial 9 is rotated counterclockwise to wind the film 18 by one frame, the sprocket is rotated once by following this.
The counter disc 25 is fed by one graduation and the shutter is charged, and the winding dial 9 is locked. Then, when the shutter button 7 is pressed, the kick-off lever
The tip of 24 is instantaneously moved to the right in the figure to take a picture.

An opening 28 is formed on the front surface of the main body 12, and a lens holder 30 is fitted into the opening 28. This lens holder 30
As shown in FIG. 1, the second lens 31, the spacing ring 32,
The shutter blade 38, the shutter cover 46, and the first lens 48 are assembled in this order, and finally, the retaining ring 49 is put on the lens holder 30 to fit them, and these are integrated. And
By determining the distance between the first lens 48 and the second lens 31 based on the thickness of the spacing ring 32, the wide-angle (approximately 75 ° angle of view) photographing lens 5 suitable for panoramic photographing is formed.

More specifically, as shown in FIG. 4, a diaphragm aperture 32a that determines the aperture diameter of the taking lens 5 is formed at the center of the spacing ring 32. The aperture opening 32a serves as an exposure opening that is opened and closed by the shutter blade 38, and this opening member also serves as the spacing ring 32. This spacing ring 32 has a diaphragm aperture.
A step portion 33 is formed so as to surround 32a. The step portion 33 keeps the mutual distance between the first lens 48 and the second lens 31 constant. A notch 32b is formed in a part of the stepped portion 33, and the shutter blade 38 can move in and out of the notch 32b to open and close the aperture 32a.

The shutter blade 38 has a substantially V-shape, one end of which is pivotally attached to a pin 51 protruding from the front surface of the main body 12, and the other end of which is integrally formed with an opening / closing plate 39 for opening and closing the aperture 32a. A portion between the V-shaped bent portion of the shutter blade 38 and the opening / closing plate 39 has a shape along an arc centered on the shaft 51.
Therefore, the swing space of the shutter blade 38 can be secured without widening the notch 32b.

The opening and closing of the shutter blades 38 is performed by a drive lever 52. The drive lever 52 is provided with a pin 57 implanted on the front of the main body 12.
And is urged by a spring 59 in a counterclockwise direction. At one end 52a of the drive lever 52, the kick-off lever 24
A pin 52b is planted at the other end. The pin 52b is engaged with a slot 38a formed in a bent portion which makes the shutter blade 38 V-shaped, and the drive lever 52 is a root portion of the shutter blade 38, that is, a portion from the shaft 51 to the V-shaped bent portion. Are overlapping. Then, when one end 52a of the drive lever 52 is kicked in the process of the kick-off lever 24 momentarily moving to the right, the drive lever 52
Swings clockwise against the spring 59, and then returns to its original position by the biasing force of the spring 59 again. When the drive lever 52 swings back and forth once in this way, the shutter blade 38 swings back and forth around the shaft 51 through the engagement of the pin 52b and the slot 38a, and the opening / closing plate 39 opens. 32a is opened and closed to perform one exposure.

The shutter cover 46 prevents the opening / closing plate 39 from dancing in the direction of the optical axis 45 when the shutter blades 38 operate, and also prevents dust and the like from entering the opening / closing plate 39 and the aperture 32a.

A lens holder 30 incorporating the taking lens 5, shutter blades 38, etc. is fitted into the opening 28 of the main body 12, and the drive lever is also used.
After attaching 52, these front surfaces are covered with a holding plate 50, thereby completing the assembly of the shutter and lens assembly.

An exposure frame 65 that determines the exposure range for the film 18 is provided on the back side of the main body 12. Since the opening 65a of the exposure frame 65 has a size of 12 × 36 mm, the negative screen size is also horizontally long for panoramic printing. A light shielding frame 68 is further coupled to the exposure frame 65. The aperture 68a of the light-shielding frame 68 has a size that does not block the light flux effective for shooting, and light from outside the shooting angle of view as shown by the broken line in the figure and light reflected by the inner surface of the main body 12 Block the incidence on 18. The light-shielding frame 68a is integrally connected to the exposure frame 65 by engagement of a claw and a hole as shown in the figure, and after the connection, the light-shielding frame 68a can be incorporated into the main body 12 as a single component.

The front cover 13 covering the front of the main body 12 has a photographic lens 5
There are provided an opening 75 and a finder objective window 6 for exposing the. An inverted Galileo type finder optical system is incorporated in the back of the finder objective window 6 so that a finder field for panoramic photography can be obtained without enlarging the finder objective window 6. Also, fingerhold 10
Is integrally formed on the front surface of the front cover 13.

The rear cover 14 that covers the back surface of the main body 12 is integrated with a film roll chamber 15 and a bottom plate 77 that closes the bottom of the cartridge chamber 16. By fixing this to the main body 12, the film 18
Is light tightly protected. In addition, a part 77a of the bottom plate 77 can be opened as shown in the drawing, and the cartridge 17 on which the film 18 having been photographed has been wound up is attached to the unit main body 3
It can be easily taken out from. Further, the rear cover 14 is integrally formed with a support surface 78 for supporting the film 18 at the exposure position from the back side. The support surface 78 is curved as shown to reduce the influence of the distortion of the photographing lens 5. Reference numeral 79 indicates a viewfinder eyepiece window, and reference numeral 80
Indicates an opening for partially exposing the winding dial 9 from the rear cover 14.

 The operation of the above configuration will be described.

When the shutter button 7 is pressed, the shutter drive mechanism 26 is released, and the kick-off lever 24 instantaneously moves from the cocking position shown in FIG. 4 to the right. In the process of this movement, the tip of the kick-off lever 24 is at one end of the drive lever 52.
52a is kicked off, and the drive lever 52 is swung clockwise against the spring 59 as shown in FIG. Then, after the kick-out lever 24 has passed the one end 52a, the drive lever 52 returns to the original position by the bias of the spring 59. One reciprocating swing of the drive lever 52 is transmitted to the shutter blade 38 via the pin 52b and the slot 38a, and the opening / closing plate 39 opens the aperture 32.
Open and close a.

Thus, while the shutter blade 38 performs one exposure, the fourth
As shown in FIGS. 5 and 5, the root portion of the shutter blade 38 always partially overlaps the drive lever 52. Therefore, even if the shutter blade 38 is suddenly operated by the instantaneous movement of the kick-off lever 24, the shutter blade 38 does not swing in the direction of the optical axis 45 (FIG. 2), and a stable exposure time can be obtained. Like Also, the spacing ring 32 is the first
Since it is a high-precision molded part for keeping the distance between the lens 48 and the second lens 31 constant, the front surface of the aperture opening 32a is also a high-precision plane, and therefore the drive lever 52
The shutter blade 38 can be smoothly slid along the front surface of the aperture 32a by only partially overlapping the other end side of the shutter blade 38 with the root portion of the shutter blade 38 from the front side. There is no need to provide a face.

The opening 65a of the exposure frame 65 is opened and closed by opening and closing the shutter blade 38.
Through 12 x 36 mm screen size is taken through. Since a light shielding frame 68 is further provided in front of the exposure frame 65,
Light from outside the angle of view that is harmful to shooting and light reflected on the inner surface of the main body 12 are cut, and the adverse effects of flare and ghost can be eliminated.

In this way, when the photographing is performed once, the lock of the winding dial 9 is released, and the film 18 can be wound. Then, while the winding dial 9 is operated to feed the film 18 by one frame, the shutter drive mechanism 26 performs the shutter charging operation via the sprocket driven by the feed of the film 18, and the kick-off lever 24 is shown in FIG. Return to the cocking position. When the film 18 is fed by one frame, the winding dial 9 is locked and the preparation for the next shooting is completed. After that, shooting and film feeding can be performed in the same manner.

The example in which the present invention is used for the lens-fitted film unit for panoramic photography has been described above, but the present invention can be applied not only to other lens-fitted film units, but also to low-cost cameras and the like.

[Effect of device]

As described above, according to the shutter device of the present invention, when the V-shaped shutter blade is moved in front of the opening member having the opening for exposure, thereby opening and closing the opening for exposure, one of the kicking levers is moved. When the shutter blade swings, the other end of the drive lever that transmits the movement in the direction to the shutter blade partially overlaps at least a part from the one end side of the shutter blade to the bent portion from the front side. The front surface of the opening member and the rear surface of the drive lever on the other end side restrict the shake of the shutter blade in the optical axis direction. Therefore, when the shutter blade swings, the opening / closing plate does not rub strongly against the front surface of the opening member, a member arranged in front of the opening member, etc., and the shutter blade can be operated accurately and stably. .

[Brief description of drawings]

FIG. 1 is a sectional view showing an essential part of the present invention. FIG. 2 is an exploded perspective view showing the structure of the main part of the present invention. FIG. 3 is an external view showing the external appearance of a lens-fitted film unit. FIG. 4 is a plan view showing a closed state of the shutter blades. FIG. 5 is a plan view showing an opened state of the shutter blades. FIG. 6 is a plan view showing the outline of a conventional shutter mechanism. 24 …… Kick-off lever 32a …… Aperture opening 38 …… Shutter blade 38a …… Slot 39 …… Opening / closing plate 51,52b, 57 …… Pin 52 …… Drive lever 52a …… One end

Claims (1)

(57) [Scope of utility model registration request] 1. A shutter device for a camera, which opens and closes an exposure opening by moving a kicking lever in conjunction with a shutter release, wherein an opening member having the exposure opening is pivotally attached to one end and the other end is attached to the other end. An opening / closing plate that opens and closes the exposure opening is integrally formed on the front surface of the opening member, and a V-shaped shutter blade having an engaging portion formed at a bent portion between the one end and the opening and closing plate, and one end of the kicking blade. The lever is pivotally mounted so as to enter the moving path of the lever, the other end of which engages with the engaging portion of the shutter blade from the front side, and the other end of which extends from at least one side of the shutter blade to the bent portion. The drive lever is overlapped with the front side from the front side, and by moving the kick lever in one direction, one end of the drive lever is kicked to swing the drive lever against the spring bias, and then the spring bias is applied. By The shutter drive lever is swung in the opposite direction to swing the shutter blade through the engaging portion to open and close the exposure opening, and when the shutter blade is opened and closed, the shutter blade moves in the optical axis direction. A camera shutter device, characterized in that shake is restricted by a front surface of the opening member and a rear surface of the drive lever on the other end side.