JP3070888B2 - Film unit with lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit with a lens.

[0002]

2. Description of the Related Art A film unit with a lens is a unit body having a simple photographing mechanism in which an unexposed roll film with a patrone is built in advance, so that a photograph can be easily taken without carrying a camera. It can be carried out.
A 135-film cartridge conforming to the ISO standard is used for the film unit with a lens. At the time of assembling, the film is pulled out from the cartridge and assembled into a roll, and loaded into the cartridge chamber and the film chamber, respectively. In use, when a film winding operation is performed every time a photograph is taken, the photographed film is sequentially wound into the cartridge.

Prior to loading a film and a patrone into the unit body, a film drawer is used to draw out the film from the patrone and put it into a roll. This device is provided with a patrone holding portion and a winding shaft for winding the film, and the leading end of the film coming out of the patrone is locked to the winding shaft, and then the winding shaft is driven. While pulling out the film, the film is wound up in a roll around a winding shaft.

[0004]

When the above-described film drawing device is used, the leading end of the film is easily bent by being locked to the winding shaft, and the center of the film roll has a curl. Easy to do. When such a film roll is loaded into the film chamber of the unit body, even if the film roll is slightly loosened, the curl remains in the center part, and the shooting progresses and the film is near the final end. In such a case, the curl portion may be clogged at the exit of the film chamber, and may not be able to be pulled out smoothly.

FIG. 4 is a cross-sectional view of the vicinity of a film chamber when a conventional general film unit with a lens is cut horizontally, and shows a state in which the movement has progressed to near the last frame. A considerable portion of the film 2 is wound around the patrone, and there is room in the inside of the film chamber 3. Loose and not spread, Film 2
Is pulled toward the outlet 3a of the film chamber 3 and moves. As a result, the winding portion of the film 2 may be caught at the exit 3a of the film chamber 3 to increase the winding torque, and in the worst case, winding may not be possible.

The present invention has been made in consideration of the above-mentioned problems of the prior art, and even if a slight curl remains in the center of the film roll, the center of the film roll is directed toward the exit of the film chamber. It is an object of the present invention to provide a lens-fitted film unit that does not move and is not caught at the exit of the film chamber.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rear cover that extends in a direction parallel to the direction in which the film is drawn out and covers both ends of the film from the rear side. While forming a rail-shaped ridge integrally, cut out the ridge near the exit of the film chamber,
A margin is provided so that the film can move to the rear side near the final end.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a lens-fitted film unit embodying the present invention. The unit main body is composed of a photographing unit 4 incorporating a shutter device, a photographing lens, and a finder lens 9, a main body portion 5, and a front cover 6 and a rear cover 7 which are clawed from front and rear thereof. A hole for exposing the photographing lens 8, the finder lens 9, the number-of-photographs display plate 10, and the winding knob 11 is provided, and a release button 12 is integrally provided. The main unit 5 has a patrone room 12 and a film room 1.
3 are formed at both ends, and the film
And a film roll wound with a film drawn out of the patron and put into a roll.

The rear cover 7 is integrally provided with a bottom cover 15 for the film chamber and a bottom cover 16 for the film having a projection 17. The bottom of the film chamber 12 and the bottom of the film chamber 13 are light-tight. To cover. The portion of the rear cover 7 that covers the rear surface of the film chamber 13 prevents the rear surface of the film 20 from being scratched by being rubbed against the inner wall of the film chamber 13 and reduces friction between the film 20 and the inner wall of the film chamber 13. Two rail-shaped ridges 18 are provided integrally so as to reduce the film thickness so that the film can be smoothly fed out. The ridges 18 support the side edges of the film 20 accommodated in the roll in the film chamber 13 from the back. A notch 18a is formed in a part of the ridge 18, so that the rear end of the film 20 does not clog the film outlet of the film chamber 13 as described later.

The operation of the above configuration will be described. Immediately after the photographing of the film unit with the lens is started, as shown in FIG. 2, the film 20 is loosely wound in the film chamber 13, and the rear surface of the outermost film is held by the ridge 18 of the rear cover 7 and the inner wall of the film chamber 13. It is in the state that it is. Even if the photographing proceeds from this state and the film 20 is reduced, the terminal 20a of the film 20 moves to the vicinity of the film outlet 13a of the film chamber 13 while the terminal 20a of the film 20 is hung on the projection 17. The film 20 can be smoothly pulled out toward the exposure position without being clogged with the film outlet 13a.

As the photographing progresses and the film approaches the end, as shown in FIG. 3, the end portion 20a of the film 20 comes off the projection 17 and is drawn near the film outlet 13a. However, since the notch 18a is formed in a part of the ridge 18, the film 20 can move to the rear side, and the part with the strong curl of the end portion 20a of the film 20 is not caught by the film outlet 13a. And therefore film exit 1
3a can be pulled out smoothly.

[0012]

As described above, according to the film unit with the lens of the present invention, the film is provided on the rail-shaped projection provided on the rear cover to cover the film chamber and for supporting the film from the rear side. Because the notch was formed near the exit of the chamber to form a step, the film could be moved to the rear side near the final end, and even if there was a curl at the rear end of the film,
This portion is not clogged at the exit of the film chamber, and the film can be wound up smoothly.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a lens-fitted film unit embodying the present invention.

FIG. 2 is a cross-sectional view of the vicinity of a film chamber before the first frame photographing of the film unit with a lens shown in FIG.

FIG. 3 is a cross-sectional view of the vicinity of a film chamber before photographing the last frame of the film unit with a lens shown in FIG.

FIG. 4 is a cross-sectional view of the vicinity of a film chamber of a conventional film unit with a lens.

[Explanation of symbols]

 7 Rear cover 13 Film chamber 18 Ridge 20 Film

Claims (1)

(57) [Claims] A main body part integrally formed with a patrone chamber for accommodating a patrone and a film chamber for accommodating a roll-shaped unexposed film; a front cover for covering a front surface of the main body part; And a rear cover for covering the film at an exposure position between the two chambers in a light-tight manner, wherein the film extends on the inner surface of the rear cover in parallel with the direction in which the film is drawn. A pair of ridges are formed integrally on both side edges of the film drawn out of the film chamber from the rear side, and the ridges facilitate the movement of the film to the rear side near the exit of the film chamber. A film unit with a lens, wherein a notch is formed.