JPH0637844U - Instant film back for camera - Google Patents

Abstract

(57) [Summary] [Purpose] In an instant film back of the type in which a fiber optic plate is interposed between the image forming surface and the photosensitive surface, the camera body is provided even if the distance between the image forming surface and the photosensitive surface is long. Provided is an instant film bag capable of reliably positioning and holding the fiber optic plate without damaging the side guide rail or the light receiving surface on the fiber optic plate side. [Structure] By positioning the fiber optic plate relative to the guide rail by bringing the positioning member fixed to the fiber optic plate into contact with the outer rail of the guide rail, the fiber optic plate can be mounted on the camera body without floating support. Since it can be easily positioned 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 does not damage each part important for optical and film transport.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a Polaroid film (trademark) in which a roll film back loaded with a normal roll film can be attached to and detached from an existing camera in place of the roll film back, and can be developed and burned at the shooting site. The present invention relates to an instant film bag loaded with an instant film such as.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, there is a camera in which, for example, a roll film back loaded with roll film is detachably attached to a camera body. In such a camera, by preparing a plurality of roll films described above, shooting can be continuously performed without the trouble of film exchange. In addition, there is an instant film bag that can be attached to the camera body instead of the roll film bag in order to load the instant film that can be developed and printed at the same time as the shooting in order to check the composition before shooting.

Shooting on the above-mentioned instant film is performed by mounting the above-mentioned instant film back on the camera body in place of the roll film back, but this instant film back is a retrofit, and the instant film is usually used. Since it is larger than the roll film, the photosensitive surface is usually behind the emulsion surface of the roll film, that is, the image forming surface. Therefore, conventionally, the image projected on the image forming surface of the camera is transferred to the rear photosensitive surface as it is by a known fiber optic plate formed by bundling optical fibers.

The fiber optic plate is usually supported in a floating manner so as to be movable back and forth along its optical path. This is done by bringing the front end face of the fiber optic plate into contact with the inner rail of the guide rail on the camera body side so that this front end face is approximately aligned with the image plane and the fiber optic plate is positioned immediately. This is to bring the rear end surface of this fiber optic plate into close contact with the photosensitive surface of the film.

However, for example, if the instant film back is carried while being attached to the camera body, the fiber optic plate vibrates, and in some cases, the front end face of the fiber optic plate collides with the inner rail of the guide rail, causing a flaw in 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 prevent the occurrence of flaws, and the inner rail of the guide rail is also the face on which the emulsion surface of the roll film abuts. Therefore, this must also prevent the occurrence of defects.

[0006] On the other hand, conventionally, a camera using a film with a frame size of 45 × 60 mm has been widely used. However, a camera for obtaining a landscape image on this screen winds the film vertically with the side having the viewfinder and the release button as the upper side. It is supposed to be taken. Further, for the purpose of downsizing the entire camera, there is also known a type in which a room is formed behind the image plane of the camera and the film is wound in this room. In such a camera, a relatively large room is defined on the emulsion surface of the roll film, that is, on the rear side of the image formation surface. The photosensitive surface is located further back in the room, increasing the distance from the image plane to the photosensitive surface of the instant film. Therefore, the fiber optic plate also has to be relatively long and heavy, and it has been impossible to support the fiber optic plate by the floating support as described above.

[0007]

[Problems to be solved by the device]

 The present invention has been made in view of the above-mentioned problems of the prior art, and its main purpose is to provide an instant film back of a type in which a fiber optic plate is interposed between the image forming surface and the photosensitive surface. At this point, the fiber optic plate must be positioned and held securely without damaging the guide rail on the camera body side or the light receiving surface on the fiber optic plate side even if the distance between the image plane and the photosensitive surface is long. It is to provide an instant film bag capable of

[0008]

[Means for Solving the Problems]

 According to the present invention, the roll film back loaded with the roll film is detachable, and the inner rail for abutting the emulsion surface of the roll film to regulate the position in the front-rear direction and the roll film. An instant film-loaded instant that can be attached instead of the roll film back to a camera body that has an outer rail that is in contact with the side edge of and that projects rearward in the optical axis direction from the inner rail. A film back, a fiber optic plate fixed to the instant film back for transferring the image projected on the image plane on which the emulsion surface is arranged, to the photosensitive surface of the instant film arranged behind the film back; It is integral with the fiber optic plate and is attached to the camera body. And a locking mechanism for holding the instant film bag in the camera body in a state in which the positioning member is in contact with the outer rail. This is accomplished by providing a special camera instant film bag.

With this configuration, the fiber optic plate can be easily positioned on the camera body without floating support, and the light receiving surface of the fiber optic plate and the film contact surface of the inner rail can be abutted against each other. It can be prevented.

[0010]

【Example】

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

FIG. 1 is a perspective view of a camera body 1 as seen from the back side, and FIG. 2 is a perspective view showing an instant film back 2 to which the present invention is applied, which is attached to the camera body 1. This camera is for taking an image using, for example, a roll film having a frame size of 45 × 60 mm, and normally, a detachable roll film back (not shown) equipped with such a roll film is provided on the camera body 1. It is used by being attached to the film storage chamber 4 having an opening on the rear surface.

For example, when confirming the composition or the like before performing regular shooting, the instant film back 2 is attached instead of the film back as shown in FIG. The instant film back 2 has, for example, an outer case 7 for accommodating 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 when mounted. And the fiber optic plate 8 for optically transferring it onto the photosensitive surface of the instant film 5. The outer case 7 is a box-shaped film case holder 7a to which a fiber optic plate 8 is fixed, and a lid pivotally attached to the film case holder 7a so that the rear end opening of the film case holder 7a can be opened and closed. 7b and a hook 7c pivotally attached to the film case holder 7a so as to keep the lid 7b closed.

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 its optical axis are finished flat. Further, as also shown in FIG. 3, the base plate 9, the cover 10 and the support plate 11 are fixed in this order on the surface facing the camera body 1 side when the film case holder 7a is attached by screws (not shown). The holder of the case 7 is constituted by them. Four fiber mounting plates 12 are adhered to the outer peripheral surfaces on four sides of the fiber optic plate 8, and the fiber mounting plates 12 are screwed to the support plate 11, so that the fiber optic plate 8 is attached to the film case holder. It is fixed to 7a. Further, a guide frame 13 as a positioning member is screwed to the fiber mounting plate 12 on the outer peripheral portion of the front end portion of the fiber optic plate 8 so that the front end surface thereof coincides with the front end surface 8b of the fiber optic plate 8. There is.

On the other hand, a guide rail composed of an inner rail 14 and an outer rail 15 is provided at the back of the film accommodating chamber 4 for the slide support of the roll film and the edge guide. The outer rail 15 slightly projects rearward in the optical axis direction with respect to the inner rail 14, and a so-called tunnel gate for passing a roll film is formed between the both rails 14, 15. The actual image forming surface of the camera body 1 is located about 0.1 mm behind the film guide surface of the inner rail 14 in the optical axis direction. Here, in the instant film back 2 of the present embodiment, the guide frame 13 comes into contact with the outer rail 15 when mounted on the camera body 1, and the fiber is The optic plate 8 is positioned in the optical axis direction. By positioning in this way, the front end face 8b of the fiber optic plate 8 can be positioned at the same position as the above-mentioned image forming plane, which is normally behind the surface connecting the pair of inner rails 14 in the optical axis direction.

As shown in FIG. 3, the film case 6 is provided with a plurality of spring pieces 6a for biasing the back surface of the instant film 5 forward. Further, a pressing spring 16 made of a leaf spring for pressing and urging the back surface of the film case 6 is provided on the inner surface of the lid 7b. Therefore, by fully closing the lid 7b, the film case 6 stored in the film case holder 7a is urged by the pressing spring 16 to be elastically supported and the instant film 5 is , Is biased by the spring piece 6a toward the rear end surface 8a of the fiber optic plate 8.

In order to mount the instant film back 2 having the outer case 7 in which the instant film 5 is housed together with the film case 6 thereof, the film housing chamber 4 should be used when mounting the roll film back. Use the lock pins 18 protruding from both side surfaces of the. 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 the lock lever 19 constituting the lock mechanism 17 is engaged with the lock pin 18, The film back 2 for the instant film can be integrated with the camera body 1.

[0017]

[Effect of device]

 As is apparent from the above description, according to the instant film back for a camera of 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 allow the fiber optic plate to move relative to the guide rail. The fiber optic plate can be easily positioned on the camera body without floating support and prevents the light receiving surface of the fiber optic plate and the film contact surface of the inner rail from colliding. Since it can do this, it does not damage the various parts that are important for optical and film transport.

[Brief description of 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 applied, which is attached to a camera body.

FIG. 3 is a cross-sectional view of essential parts showing a state in which an instant film back is attached to a camera body.

[Explanation 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 Holding spring 17 Lock mechanism 18 Lock pin 19 Lock lever

Claims (1)

[Scope of utility model registration request] 1. A roll film back loaded with a roll film is detachable, and contacts an inner rail for contacting an emulsion surface of the roll film to regulate its longitudinal position and a side edge of the roll film. An instant film bag loaded with an instant film, which can be attached in place of the roll film back to a camera body having an outer rail that is in contact with and protrudes rearward of the inner rail in the optical axis direction, A fiber optic plate fixed to the instant film back for transferring an image projected on an image plane on which an emulsion surface is arranged to the photosensitive surface of an instant film arranged behind the emulsion film; and an integral part of the fiber optic plate. And position the plate with respect to the camera body For a camera, including a positioning member that comes into contact with the outer rail as much as possible, and a lock mechanism that holds the instant film back on the camera body in a state where the positioning member comes into contact with the outer rail. Instant film back.