JPS6014250Y2 - Film back for cameras that use perforated film - Google Patents

Description

[Detailed explanation of the invention] This invention is based on instant print film (instant print film) used for instant print photography, which is developed and printed each time a photograph is completed, and a photograph is created on the spot.
Hereinafter referred to as instant film.

) related to camera film backs that can be loaded.

This type of instant film is stacked in a cartridge, and each time a photo is taken, the exposed instant film is fed out of the camera from inside the cartridge.
At that time, processing chemicals are applied to the film, and the film is developed and printed.

Conventionally, some cameras using perforated film have a film back for storing the instant film fixed to the camera in order to make the instant film usable.

However, this cannot be used in a systemized camera in which a motor drive device or a data imprinting device can be replaced.

In addition, the size of conventional commercially available instant film is about the size of a hand, so for example, a 35mm reflex camera can take four shots, so one sheet of instant film can be used to take multiple shots. It is important from the viewpoint of effective use of instant film to make it possible.

The present invention was developed based on these points of view, and its purpose is to make it possible to use instant film interchangeably with cameras that use perforated film, and to develop a film that can effectively utilize instant film. The purpose is to provide backing.

The present invention will be explained below.

In FIG. 1 showing an embodiment of the present invention, 1 is a camera body, 2 is a lens, 3 is a focusing glass, and 4 is a reflecting mirror.

A pair of outer guide rails 5a, 5b and an inner guide rail 6at6b, which serve as guide rails, position the film stored in the normal patrol.

This positioning involves positioning the film surface at the focal position of the lens 2, and the film surface and the focusing glass 3
is placed at a position conjugate to the focal plane of.

Therefore, focusing is easily performed.

Reference numeral 7 denotes a camera back cover, which is detachable from the camera body 1.

The positioning pressure plate 8 is supported by a pair of springs 9a, 9b, and when the camera back cover 7 is closed, the outer guide rails 5a, 5
b and one or both of the inner guide rails 6at6b.

This positioning pressure plate 8 and springs 9a and 9b constitute a first positioning member.

The fixing plate 10 is fixed to the camera back cover 7.

The positioning shaft 12 has its tip fixed to the positioning pressure plate 8 with screws or the like, and extends inside the camera back cover 7 and the fixing plate 10.

The aperture plate 14 is rotatably supported at the other end of the positioning shaft 12.

A flange 12a is provided on the positioning shaft 12 to prevent the aperture plate 14 from moving toward the camera back cover.

The friction spring 11 and the flange 12a are the positioning shaft 12
The other end is connected to the aperture plate 14, so that when the positioning shaft 12 moves in the axial direction, the aperture plate 14 also moves together.

The rotary plate 15 allows the aperture plate 14 to move in the axial direction, and is configured so that the rotation of the rotary plate 15 is transmitted to the aperture plate, and is rotatably supported by the fixed plate 10.

Therefore, when the rotating plate 15 is rotated, the aperture plate 14 is rotated.

Further, when the positioning pressure plate 8 and the guide rail are engaged and the positioning shaft 12 is pushed out toward the film back back cover 16, the aperture plate 14 is also pushed out in the same direction by the flange 12a.

In the opposite direction (when the camera back cover is opened), the aperture plate 14 and the positioning shaft 12 are connected by the friction spring 11, so these are connected by the springs 9a and 9.
It is moved by b.

Here, the aperture plate 14 constitutes a second positioning member, the positioning shaft 12 and the collar portion 12a constitute a third positioning member, and the fixed plate 10 and the rotary plate 15 constitute fixed members.

The film back back cover 16 is detachable from the rotary plate 15, and is fixed with springs 17at and 17b.

Instant film 1 is installed in film cartridge 18.
9 is stored.

This cartridge 18 is manufactured by removing the film back cover 16 from the rotating plate 15, arranging the cartridge so that the instant film 19 faces the aperture plate 14, and then attaching the film back cover 16 to the rotating plate 15.
By housing this cartridge 18, it is loaded into a film bag.

As a result, the cartridge 18 is pressed toward the aperture plate 14 by the springs 17a and 17b, and the instant film 19 is pressed against the aperture plate 14.

Openings 8a and 7 through which the subject light from the photographic lens 2 passes
a, lea, and 14a are provided on the positioning pressure plate 8, camera back cover 7, fixing plate 10, and aperture plate 14, respectively, and their sizes are such that a screen of approximately the standard size of 35 mm film can be obtained. .

With the above structure, when the camera back cover 7 is closed, the positioning pressure plate 8, the positioning shaft 12, and the aperture plate 14 are moved in one direction (to the right in the figure) by the guide rail 5.
a, 5b, 6a, 6b are engaged with the positioning pressure plate, and the spring 9
a, 9b are compressed against the biasing force, and the springs 9a, 9b are moved in the other direction (to the left in the figure).
moved by

Therefore, the distance from the film surface of the camera to the film surface of the instant film 19 is determined by the distance between the positioning pressure plate 8 and the aperture plate 14 defined by the thickness of the positioning pressure plate 8, the thickness of the aperture plate 14, and the positioning axis 12. determined by

Therefore, if the thickness of the positioning pressure plate 8 and the aperture plate 14 and the distance between the positioning pressure plate 8 and the aperture plate 14 are determined in advance, the film surface when using an instant film will be different from that when using a normal perforated film. The amount of movement toward the film surface can be made constant.

. Therefore, in order to focus, it is sufficient to move the focusing glass 3 from the normal position by the amount of movement described above.

Incidentally, since commercially available instant films are approximately the size of a bill, the aperture plate 14 has four apertures 14a=14b, 1 as shown in FIG.
4cm 14d is provided, and this is connected to 1 by the rotary plate 15.
By rotating it, you can take four frames of photos with one piece of instant film.

As described above, according to the present invention, a film bag that stores instant film can be replaced and attached to a camera that uses conventional film, making it possible to take instant photographs with a conventional camera when necessary.

Further, the movement of the focusing glass by using a film back becomes easy because the moving distance can be set constant.

Furthermore, instant film can be used effectively.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a front view of the aperture plate in FIG. 1. Explanation of symbols of main parts, ... Positioning pressure plate - first positioning member, 9a, 9b ... Spring first
positioning member, 14...Aperture plate-second positioning member, 12...positioning shaft-third positioning member, 10...fixing plate-fixing member, 15・
... Rotating plate - fixed member.

Claims (1)

[Scope of Claim for Utility Model Registration] A camera back cover device comprising a camera back cover 7 and a positioning pressure plate 8 which faces the film opening of the camera body 1 and has openings 8a and 7a, respectively. The portion 10a is connected to the two openings 8a, ? a fixing plate 10 that faces the camera back cover 7 and is integrally formed on the back surface of the camera back cover 7;
A plurality of exposure area determining apertures 1 adjacent to the setting surface
An aperture plate 14 having 4a to 14d formed thereon, and springs 17a and 17b for pressure contacting the cartridge of the instant film 19 on the inner wall surface facing the setting surface of the aperture plate 14, and a film back mounted on the aperture plate 14. The aperture plate 14 is light-tightly and rotatably engaged with the back cover 16 and the fixed plate 10 with their respective openings 10a and 14a facing each other, and the positioning shaft 12, which is the center of rotation, is connected to the aperture plate 14. A film back characterized in that the plate 14 is connected to the positioning pressure plate 8 through at least the fixing plate 10 from a substantially central portion thereof.