JPH06148809A - Film unit with lens and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a film unit with a lens for preventing the film roll from being caught on the exit of a film chamber owing to the moving of the center of the film roll to the exit of the film chamber caused by the generation of the margin of the film chamber while taking up the film at the time of photographing with the use of a curled film. CONSTITUTION:A cartridge chamber 6 and the film chamber 5 are formed on both end parts on a main body part 4 and a cartridge 11 and the film roll 17 onto which the film 12 pulled out of the cartridge 11 is wound are housed inside respectively. Then, an opening 7 is provided on the film chamber 5 and a boss 10 is fitted into the film chamber 5 with light tight structure.

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 lens-fitted photo film unit is an unexposed roll film with a patrone that is built into a unit body equipped with a simple photo-taking mechanism. It can be carried out.
The lens-fitted film unit uses a 135 film cartridge that conforms to the ISO standard. When the film unit is assembled, the film is pulled out from the cartridge and collected into rolls, which are respectively loaded into the cartridge chamber and the film roll chamber. Then, when the film is wound up each time a photograph is taken during use, the photographed film is sequentially rolled into the cartridge.

Before loading the film and the cartridge in the unit main body, there is used a film drawing device for drawing the film from the cartridge and collecting the film into a roll. This device is provided with a holder for the cartridge and a winding shaft for winding the film, and by driving the winding shaft after locking the winding shaft at the leading end of the film coming out of the cartridge, While pulling out the film, it is wound around the winding shaft in a roll shape.

[0004]

When the film drawing device as described above is used, a strong bending is likely to occur at the leading end of the film due to the engagement with the winding shaft, and a winding habit is formed at the center of the film roll. Easy to do. When such a film roll is loaded in the film roll chamber of the unit main body, even if the film roll is loosened a little, the curl remains in the central portion, and when the shooting progresses to some extent The exit of the film roll chamber may become clogged and it may not be possible to pull it out smoothly.

FIG. 4 is a cross-sectional view of a conventional general lens-fitted film unit with its central portion cut horizontally. The film 12 is in a state in which a considerable portion is wound up on the patrone 11 and there is a margin inside the film roll chamber 5, but the film roll 17 has a winding habit, so that it is placed inside the film roll chamber 5. Loose and not spread,
The central part of the film roll 17 is pulled and moved toward the exit of the film roll chamber 5. As a result, the film roll 17 may be caught at the exit of the film roll chamber 5 to increase the winding torque, or in some cases, the winding may be impossible.

The present invention has been made in consideration of the above problems of the prior art. Even if some curl remains in the center of the film roll, the center of the film roll is directed toward the exit of the film roll chamber. It is an object of the present invention to provide a lens-fitted photo film unit which does not get caught at the exit of the photo film roll chamber by moving to.

[0007]

In order to achieve the above object, an opening is provided in the upper part of a film roll chamber of a film unit with a lens, and the film roll is inserted in a space formed in the center of the film roll. The boss is fitted or pressed into the opening with a light-tight structure. As a result, the central portion of the film roll having a curl is regulated so as not to move toward the exit of the film roll chamber.

[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 main body of the unit is composed of a main body 4 and a front cover-1 and a rear cover-13 which are claw-fastened to the front and rear of the unit. The front cover-1 has a taking lens 8, a finder 3, a number-of-photos display plate 9, and a winding knob. A hole for exposing 18 and the like is provided, and a release button 2 is integrally provided. Patrol on the main body 4
A film chamber 6 and a film roll chamber 5 are formed at both ends, and accommodates a patrone 11 and a film roll 17 around which a film 12 drawn from the patrone 11 is wound.

An opening 7 having a plurality of steps is formed in the upper portion of the film roll chamber 5, and a rod-shaped boss 10 is fitted from the opening 7 toward the inside of the film roll chamber 5. The head portion of the boss 10 conforms to the shape of the step formed in the opening portion 7, so that the boss portion 10 fits into the opening portion 7 while maintaining a light-tight state.

FIG. 2 is an exploded perspective view mainly showing a film feeding portion of the lens-fitted film unit embodying the present invention. When the winding knob 18 is turned, the fork 19 is rotated, and the patrone shaft 20 meshing with the fork 19 is rotated in association therewith, so that the film 12 is wound up and wound into the patrone 11. At this time, the film 12
The perforation 21 provided on the sprocket rotates the sprocket 14 to perform the shutter charge operation.

The operation of the above configuration will be described. When the lens-fitted film unit is assembled, the film roll 17 and the patrone 11 are axially loaded from the bottom surface of the main body 4. When the winding shaft around which the film 12 is wound is pulled out from the film roll chamber 5, the film roll 17 is loosely wound in the film roll chamber 5 to some extent, and a space is formed in the central portion thereof.

Next, a rod-shaped boss 10 is fitted from the upper part of the film roll chamber 5 in the direction of the space in the film roll chamber 5, and the head of the boss 10 is light-tight in the opening 7 of the film roll chamber 5. Mated. Further, a rear cover 13 with a bottom cover of the film roll chamber 5 or the Patron chamber 6 is fitted to the main body portion 4 to fit the film roll chamber 5 or the Patron chamber 6
Is closed, and then the front cover 1 is put on to complete the assembly of the lens-fitted photo film unit. When the boss 10 is fitted in the opening 7 as in this embodiment, the length of the boss 10 is the same as that of the tongue portion having a width of 23 mm, which is usually formed at the end portion of the film. A similar effect is expected.

When the lens-fitted film unit assembled in this way is used, the film 1 which has already been photographed is operated by operating the winding knob 18 each time the photograph is taken.
2 is caught in Patrone 11. Therefore, as the shooting progresses, the film 12 is gradually pulled out from the film roll chamber 5. Then, as the shooting progresses to some extent, a vacant space is formed in the film roll chamber 5 as shown in FIG. However, film roll 1
Since the boss 10 is inserted in the central portion of the film 7, the film roll 17 does not move toward the exit of the film roll chamber 5 even when the film 12 is pulled out in such a state.

[0014]

As described above, according to the film unit with a lens of the present invention, the opening is provided in the upper portion of the film roll chamber, and the boss is fitted in the light-tight structure so that the film roll can be moved by the boss. Since it is prevented, even if there is a curl in the center of the film roll, this part will not be blocked at the exit of the film roll chamber, and the film winding will not be heavy,
The film can be wound smoothly.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view of a film feeding portion of the lens-fitted film unit shown in FIG.

FIG. 3 is a sectional view of a film feeding portion of a lens-fitted film unit embodying the present invention.

FIG. 4 is a cross-sectional view of a film feeding portion of a conventional lens-fitted film unit.

[Explanation of symbols]

 5 film roll chamber 6 patrone chamber 7 opening 10 boss 11 patrone 12 film 17 film roll

Claims (3)

[Claims] 1. A patrone chamber for accommodating a film patrone, a film roll chamber for accommodating a film roll drawn out from the film patrone into a roll, and
A lens-fitted film unit having a unit main body provided with a photographing mechanism, a cartridge chamber of the unit main body, and a rear cover that covers the back and bottom of the film roll chamber in a light-tight manner, and an opening is provided above the film roll chamber. A portion is provided, and a boss is fitted into the opening so that the light-tight state of the film roll chamber is maintained in such a direction as to enter the space formed in the center of the film roll. A film unit with a lens. 2. The length of the boss is equal to or less than the length of the width of the tongue portion formed by cutting out a part of the film formed at the end of the film. The film unit with a lens according to 1. 3. A patrone chamber for accommodating a film patrone, a film roll chamber for accommodating a film roll drawn out from the film patrone into a roll, and
In a method for manufacturing a lens-fitted film unit having a unit main body provided with a photographing mechanism, a cartridge chamber of the unit main body, and a rear cover that covers the back and bottom of the film roll chamber in a light-tight manner, An opening is provided in the upper part, the film roll is loaded from the bottom of the unit main body to the upper direction, and a rod-shaped boss is fitted from the upper part of the film roll chamber to the inner direction of the film roll chamber,
A method of manufacturing a lens-fitted film unit, comprising: fitting the head of the boss into the opening of the film roll chamber with a light-tight structure and then closing the rear cover including the bottom lid of the film roll chamber.