JP2575122Y2 - Instant film back for camera - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention can be applied to a detachable camera in which a roll film bag loaded with a normal roll film can be mounted in place of a roll film bag, and can be developed and printed at a shooting site. The present invention relates to an instant film bag loaded with an instant film such as Polaroid Film (trademark).

[0002]

2. Description of the Related Art Conventionally, there is a camera in which, for example, a roll film bag loaded with a roll film is made detachable from a camera body. In such a camera, by preparing a plurality of the roll films, it is possible to continuously perform photographing without complicating film exchange. Also, to check the composition before shooting,
There is an instant film bag that is loaded with an instant film that can be developed and printed at the same time as shooting, and that can be mounted on a camera body instead of a roll film bag.

[0003] The above-mentioned shooting on the instant film is performed by mounting the above-mentioned instant film bag on the camera body instead of the roll film bag. Due to the size being larger than the film, the photosensitive surface is usually behind the emulsion surface of the roll film, that is, the image forming surface. Therefore, conventionally, an image projected on an image forming surface of a camera by a known fiber optic plate formed by bundling optical fibers is directly transferred to a rear photosensitive surface.

[0004] The fiber optic plate is normally floatingly supported so as to be able to move back and forth along its optical path. This is because the front end face of the fiber optic plate is brought into contact with the inner rail of the guide rail on the camera body side so that the front end face substantially coincides with the image forming plane, and the position of the fiber optic plate is determined. This is for bringing the rear end face of the fiber optic plate into close contact with the surface.

However, for example, when the instant film bag is carried while being attached to the camera body, the fiber optic plate vibrates, and in some cases, the front end face of the plate and the inner rail of the guide rail collide with each other, causing flaws on both. I was worried. Here, it is needless to say that the front end face of the fiber optic plate, that is, the light-receiving face, must be prevented from generating flaws, and the inner rail of the guide rail is also the face on which the emulsion face of the roll film contacts. For this reason, it is necessary to prevent the generation of flaws.

On the other hand, a camera using a film having a frame size of 45 × 60 mm has been widely used, but a camera for obtaining a horizontally long image on this screen winds the film in a vertical direction with a viewfinder and a release button on the upper side. To take. Further, there is known a type in which a room is formed behind an image forming plane of the camera and a film is wound in the room for the purpose of reducing the size of the entire camera. In such a camera, since a relatively large room is defined behind the emulsion surface of the roll film, that is, behind the image forming surface, when the above-described instant film back is used, the photosensitive surface of the instant film is used. Is further behind the room, and the distance from the imaging surface to the photosensitive surface of the instant film is longer. Therefore, the fiber optic plate must be relatively long and heavy, and it is almost impossible to support the fiber optic plate in the above-mentioned floating support form.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and its main purpose is to provide a fiber optic plate between an imaging surface and a photosensitive surface. In the case of an interposed instant film back, even if the distance between the imaging surface and the photosensitive surface is long, the guide rail on the camera body and the light receiving surface on the fiber optic plate are not damaged, and the fiber optic plate is securely attached. The present invention provides an instant film bag which can be positioned and held in the camera.

[0008]

According to the present invention, a roll film back loaded with a roll film is detachable and abuts against the emulsion surface of the roll film to regulate the position in the front-rear direction. An instant rail that can be mounted in place of the roll film back on a camera body having an inner rail for mounting and an outer rail that is located at a position in contact with a side of the roll film and protrudes rearward in the optical axis direction from the inner rail. An instant film bag loaded with film, wherein the image projected on the imaging surface on which the emulsion surface is arranged is fixed to the instant film bag for transferring the image to a photosensitive surface of an instant film arranged behind the instant film bag. A fiber optic plate, integral with the fiber optic plate, and A positioning member that abuts on the outer rail to position the seat with respect to the camera body; and a lock mechanism for holding the instant film bag on the camera body with the positioning member abutting on the outer rail. This is achieved by providing an instant film bag for a camera, comprising:

With this configuration, the fiber optic plate can be easily positioned on the camera body without floating support, and the collision between the light receiving surface of the fiber optic plate and the film contact surface of the inner rail can be prevented. it can.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a camera body 1 as viewed from the back side, and FIG. 2 is a perspective view showing an instant film bag 2 to which the present invention is applied, which is attached to the camera body 1. This camera is, for example, top size 4
This is for photographing using a roll film of 5 × 60 mm. Usually, a detachable roll film back (not shown) loaded with such a roll film is opened at the rear surface of the camera body 1. Used by being attached to.

For example, when confirming the composition or the like before performing normal photographing, an instant film bag 2 is attached instead of the film bag as shown in FIG. The instant film bag 2 includes, for example, an outer case 7 for housing a flat box-shaped film case 6 for accommodating a plurality of instant films 5 and an image formed at a predetermined position in the camera body 1. And a fiber optic plate 8 for optically transferring the photosensitive film onto the photosensitive surface of the instant film 5. The outer case 7 has a box-shaped film case holder 7a to which the fiber optic plate 8 is fixed, and a lid 7b pivotally attached to the film case holder 7a so as to be capable of opening and closing a rear end opening of the film case holder 7a. And the lid 7b
Case holder 7a in order to keep the
And a hook 7c pivotally mounted on the hook 7c.

The fiber optic plate 8 is formed in a block shape in which optical fibers are bundled, and both end surfaces 8a and 8b of the optical axis are finished flat. Also,
As shown in FIG. 3, the film case holder 7
A base plate 9, a cover 10, and a support plate 11 are fixed to a surface facing the camera body 1 in this order by screws (not shown) in this order, and a holder of the case 7 is constituted by these. Fiber optic plate 8
Four fiber mounting plates 12 are adhered to the four outer peripheral surfaces, and the fiber mounting plates 12 are screwed to the support plate 11, and the fiber optic plate 8 is fixed to the film case holder 7a. I have. Also, on the outer peripheral portion of the front end portion of the fiber optic plate 8,
A guide frame 13 as a positioning member is screwed to the fiber mounting plate 12 so that its front end face matches the front end face 8b of the fiber optic plate 8.

On the other hand, an inner rail 1 is provided behind the film accommodating chamber 4 for sliding support of the roll film and guiding the edge.
4 and a guide rail including an outer rail 15 are provided. The outer rail 15 slightly protrudes rearward of the inner rail 14 in the optical axis direction, and a so-called tunnel gate for passing a roll film is formed between the two rails 14 and 15. The actual imaging plane of the camera body 1 is located at a distance of 0.1 mm behind the film guide surface of the inner rail 14 in the optical axis direction.
It is located about 1 mm behind. Here, in the instant film bag 2 of the present embodiment, the guide frame 13 comes into contact with the outer rail 15 when attached to the camera body 1, and the fiber optic plate 8 is positioned in the optical axis direction. By positioning in this manner, the front end face 8b of the fiber optic plate 8 can be positioned at a position equivalent to the above-described image forming plane, which is located rearward in the optical axis direction from the plane connecting the pair of inner rails 14 together.

As shown in FIG. 3, the film case 6 is provided with a plurality of spring pieces 6a for urging the rear surface of the instant film 5 forward.
A pressing spring 16 made of a plate spring for pressing and biasing the rear surface of the film case 6 is provided on the inner surface of the lid 7b. Accordingly, by completely closing the lid 7b, the film case 6 accommodated in the film case holder 7a is urged by the pressing spring 16 to be elastically supported, and the instant film 5 is
The fiber optic plate 8 is urged toward the rear end face 8a by a spring piece 6a.

In order to mount the instant film bag 2 having the outer case 7 in which the instant film 5 is housed together with the film case 6 on the camera body 1, it is necessary to mount the instant film bag 2 in the film accommodating chamber 4 in order to use the roll film bag. Lock pins 18 protruding from both sides
Use That is, a lock mechanism 17 similar to the lock mechanism provided on the roll film back is provided on the support plate 11 (FIG. 2), and a lock lever 19 constituting the lock mechanism 17 is engaged with the lock pin 18. The instant film back 2 can be integrated with the camera body 1.

[0017]

As is apparent from the above description, according to the instant film bag for a camera according to the present invention, the positioning member fixed to the fiber optic plate is brought into contact with the outer rail of the guide rail to thereby fix the fiber optic plate. By positioning with respect to the guide rail, the fiber optic plate can be easily positioned on the camera body without floating support, and the collision between the light receiving surface of the fiber optic plate and the film contact surface of the inner rail is achieved. Since it can be prevented, each part important in optical and film transport is not damaged.

[Brief description of the drawings]

FIG. 1 is a perspective view of a camera body as viewed from the back side.

FIG. 2 is a perspective view showing an instant film bag to which the present invention is mounted on a camera body.

FIG. 3 is a cross-sectional view of a main part showing a state where an instant film back is mounted on a camera body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera body 2 Instant film back 4 Film storage room 5 Instant film 6 Film case 7 Outer case 7a Film case holder 7b Lid 7c Hook 8 Fiber plate 8a Rear end face 8b Front end face 9 Base plate 10 Cover 11 Support plate 12 Fiber mounting plate 13 Guide frame 14 Inner rail 15 Outer rail 16 Pressing spring 17 Lock mechanism 18 Lock pin 19 Lock lever

Claims (1)

(57) [Scope of request for utility model registration] 1. A roll film back loaded with a roll film is detachable, and is in contact with an inner rail for contacting an emulsion surface of the roll film to regulate a position in the front-rear direction and a side edge of the roll film. An instant film bag loaded with an instant film, which can be mounted in place of the roll film bag on a camera body having an outer rail projecting rearward in the optical axis direction from the inner rail at a position in contact with the inner rail. A fiber optic plate fixed to the instant film bag so as to transfer an image projected on the imaging surface on which the emulsion surface is disposed to a photosensitive surface of an instant film disposed behind the fiber optic plate; And positioning the plate with respect to the camera body A positioning member that abuts against the outer rail, and a lock mechanism for holding the instant film back to the camera body with the positioning member abutting on the outer rail. Instant film back.