JP3585290B2 - Film unit with lens - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a film unit with a lens.
[0002]
[Prior art]
The 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. A 135-film patrone conforming to the ISO standard is used for the film unit with a lens. At the time of assembling, a photographic film is pulled out from the patrone, assembled into a roll, and loaded into a patrone room and a film room, respectively. In use, when a film winding operation is performed every time photographing is performed, photographed photograph films are sequentially wound into the cartridge.
[0003]
On the inner wall of the film chamber of the lens-equipped film unit, a pair of rail-shaped ridges are provided so as to be in sliding contact with the back side of the photosensitive surface of the photographic film as described in, for example, JP-A-6-250338. It is provided in parallel with the winding direction of the film. This ridge prevents the back of the photographic film from scratching the entire inner wall of the photographic film when the photographic film moves in the film room, and also reduces the friction between the back of the photographic film and the inner wall of the film room. Thus, there is a function that allows the photo film to be smoothly pulled out from the film chamber.
[0004]
It is known that the higher the height of such a ridge, the more effective it is in reducing the friction of the photographic film and preventing abrasion. It is also known that the film has an effect of preventing bending in the width direction of the film. Separately, the height of the ridge near the film chamber outlet, which is the outlet from which the photo film is drawn out, is increased so that the photo film drawn from the film chamber does not bend at the aperture. There is a need to.
[0005]
On the other hand, in recent years, in order to achieve further miniaturization of a film unit with a lens, a film chamber for accommodating a photographic film and an aperture as an exposure opening are provided adjacent to each other, so that a film unit with a lens with a smaller width is provided. Is also being provided.
[0006]
[Problems to be solved by the invention]
However, as described above, the film chamber of the lens-fitted film unit and the aperture are provided adjacent to each other in order to reduce the size, and the height of the ridge is reduced to prevent bending at the aperture portion of the photographic film and to prevent abrasion. When the height is increased, the inclination of the ridge near the exit of the film chamber, which is the boundary between the film chamber and the aperture, becomes steep, and the portion continuous with the flat portion becomes angular. Then, there is a problem that the perforations of the photographic film fall into the corners of the ridge and are caught, and the winding torque increases when the photographic film is wound.
[0007]
In addition, the film unit with the lens uses ultrasonic welding to connect each part in the assembling process, but after the photographic film patrone is loaded, as described above, the perforations fall into the corners of the ridges as described above. When ultrasonic waves are irradiated for connection, the perforations stick to the corners of the ridges, which may result in defective products.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems of the related art, and provides a film unit with a lens capable of reducing the friction between a photographic film and a ridge when the photographic film is rolled up and smoothly winding the photographic film. The purpose is to do.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a film unit with a lens according to the present invention, wherein a photographic film is formed integrally with an inner surface of a rear cover, from a portion covering a rear surface of a film chamber to a portion facing an aperture. And supports the photographic film from above and below the exposure range from the back side, and at the exit of the film chamber is raised to a certain height on the aperture side, at least one of which is provided along the perforation arrangement position. A pair of first ridges and an inner surface of the rear cover are integrally formed, and are raised at least at the predetermined height at an exit portion of the film chamber, and support the photographic film from the back side outside the first ridges. A second ridge is provided.
[0010]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is an exploded perspective view of the film unit with a lens according to the present invention. FIG. 3 is a sectional view of the vicinity of the film chamber. The lens-fitted film unit 2 includes a photographing unit 6 incorporating a shutter device 4, a photographing lens 5, and the like, a main body 7, a front cover 8 and a rear cover 9 which are claw-fixed to the main body 7 from front and rear.
[0011]
The front cover 8 is provided with holes for exposing the photographing lens 5, the finder 11, the number-of-images-displayed plate 12, the winding knob 13, and the like, and the release button 14 is integrally provided. The main body 7 is provided with a patrone chamber 16 and a film chamber 17 on both sides of the aperture 10 which is an exposure opening. The photographic film patrone 18 and the patrone main body 18a are drawn inside. The film rolls 19a in which the obtained photographic films 19 are rolled are stored.
[0012]
A rear cover 9a and a film chamber bottom cover 9b are provided integrally with the rear cover 9, respectively, so that the bottom of the film chamber 16 and the bottom of the film chamber 17 are light-tightly covered. I have. A portion of the rear cover 9 which covers the back of the film chamber 17 is a boundary between the film chamber 17 and the aperture 10 and is directed to an end of the film chamber 17 from a film chamber outlet 17a from which a photographic film 19 is drawn out from the film chamber 17. Thus, a pair of first protrusions 21a and 21b are provided integrally.
[0013]
The first ridges 21a and 21b are provided at positions in sliding contact with the perforation rows 19c and 19d provided on both sides of the photo film 19, and support the photo film 19 from the back. The first ridges 21a and 21b prevent the rear surface of the photographic film 19 from being rubbed against the inner wall of the film room 17 and also reduce the friction between the photographic film 19 and the inner wall of the film room 17. To be paid out smoothly.
[0014]
A pair of second ridges 22a, 22b is provided integrally with the rear cover 9 outside the first ridges 21a, 21b so as to be parallel to the first ridges 21a, 21b. As shown in FIG. 1, the second ridges 21a and 21b are formed at the same height as the first ridges 21a and 21b, and are provided at positions where they are in sliding contact with the outside of the perforation rows 19c and 19d of the photographic film 19. The photo film 19 is supported from the back. The second ridges 22a and 21b prevent the perforation rows 19c and 19d from falling into the corners 21c and 21d of the first ridges 21a and 21b.
[0015]
The operation of the above configuration will be described. Immediately after the photographing of the film unit 2 with the lens is started, as shown in FIG. 3, the photographic film 19 is loosely wound in the film chamber 17 as a film roll 19a, and the perforation rows 19c and 19d of the outermost photographic film 19 are the first ridges. At 21a, 21b, the outside is held by the second ridges 22a, 22b, respectively. When the photographic film of the lens-fitted film unit 2 is wound, the wind-up knob 13 is turned. As a result, the spool of the photo film cartridge 18 rotates, and the photo film 19 is sequentially pulled out from the film chamber outlet 17a of the film chamber 17.
[0016]
At this time, the perforation rows 19c and 19d of the photographic film 19 try to fall into the corners 21c and 21d of the first ridges 21a and 21b, but as shown in FIG. Since the second ridges 22a and 21b having the same height as the first ridges 21a and 21b are supported, the perforation rows 19c and 19d do not fall into the corner portions 21c and 21d.
[0017]
Therefore, when the photographic film of the lens-fitted film unit 2 is wound, the perforation rows 19c and 19d are not caught on the corner portions 21c and 21d, and the winding torque of the photographic film 19 does not increase or the winding becomes impossible.
[0018]
In the above embodiment, a certain gap is provided between the first ridge and the second ridge provided on the rear cover. In addition, the first ridge and the second ridge are also provided. The photographic film may be supported from the back side by providing the first ridge and the second ridge as continuous wide ridges without gaps.
[0019]
Further, in the above-described embodiment, an example of a film unit with a lens of a type in which a photographic film previously stored in a patrone main body is drawn out, collected in a roll shape, and loaded into a film chamber is shown. And a roll-shaped photo film may be formed in advance, and when loaded into the unit main body, the end of the photo film and the spool of the cartridge body may be combined and stored.
[0020]
Further, in the above embodiment, a photographic film having perforations continuously provided on both sides is used. Of course, perforations are provided only on one side, and several perforations are taken for each photographing frame. The present invention can be implemented in exactly the same manner even when a photographic film provided with is used.
[0021]
【The invention's effect】
As described above, according to the film unit with the lens of the present invention, the film unit is formed integrally with the inner surface of the rear cover and extends along the feeding direction of the photographic film from a portion covering the rear surface of the film chamber to a portion facing the aperture. The photographic film is supported from the back side above and below the exposure range, and at the exit of the film chamber is raised to a certain height on the aperture side, at least one of which is provided along a perforation arrangement position. A second ridge formed integrally with the first ridge and the inner surface of the rear cover, raised at least at the predetermined height at an exit portion of the film chamber, and supporting the photographic film from the back side outside the first ridge. When the photo film is wound up, the friction between the photo film and the ridge is reduced, and the photo film can be rolled up smoothly. It is possible to provide a Lum unit.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part showing the vicinity of a film chamber outlet of a lens-fitted film unit embodying the present invention.
FIG. 2 is an exploded perspective view of a lens-fitted film unit embodying the present invention.
FIG. 3
FIG. 2 is a cross-sectional view of the vicinity of a film chamber of a film unit with a lens according to the present invention.
FIG. 4 is an explanatory view showing a state of contact between a first ridge and a second ridge of the lens-fitted film unit of the present invention and a photographic film.
[Explanation of symbols]
9 Rear cover 17a Film chamber exit 19 Photo films 19c, 19d Perforation rows 21a, 21b First ridges 21c, 21d Square parts 22a, 22b Second ridges

Claims (1)

There is provided a patrone chamber for accommodating a patrone for winding a photographed photo film, and a film chamber for accommodating a roll-shaped photographic film with one end locked to a spool of the patrone. A film unit with a lens having an aperture for determining an exposure range, and a rear cover fixed to the back of the main body and covering both chambers and the aperture from the back side in a light-tight manner.
The photo film is formed integrally with the inner surface of the rear cover and extends along a feeding direction of the photographic film from a portion covering the back of the film chamber to a portion facing the aperture, and supports the photographic film from above and below the exposure range from the back side. At the same time, at the exit of the film chamber, it is raised to a certain height on the aperture side, at least one of which is formed integrally with a pair of first ridges provided along the perforation arrangement position and the inner surface of the rear cover. And a second ridge raised at least at the predetermined height at an exit portion of the film chamber and supporting the photographic film from the rear side outside the first ridge. .

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