Lens-fitted photographic film unit and method of manufacturing t

Details Lens-fitted photographic film unit and method of manufacturing t Lens-fitted photographic film unit and method of manufacturing t

1994-11-14

1996-08-20

Blankenship, Howard B.

354212, G03B 1742

Patent

active

055483640

ABSTRACT:
A lens-fitted film unit is preloaded with photographic film, and has an eight-toothed driven sprocket wheel in mesh with perforations on the film. When the photographic film is fed by one frame, the sprocket is caused to make one rotation. A shutter mechanism is cocked responsive to rotation of the sprocket. During assembly of the film unit, the shutter mechanism is cocked. The photographic film is loaded while the shutter mechanism remains cocked. In a preferred embodiment, the sprocket is set in a predetermined rotated position which is two teeth short of the position at the end of one winding up of the film. This brings the shutter mechanism into an incompletely cocked state. The photographic film is loaded while the shutter mechanism remains in the incompletely cocked state. In the film unit, a film passageway is provided behind the main body, for passage of the film. A shiftable engaging portion projects into the film passageway in retractable fashion. A notch is formed in an edge of the film, is engaged with the shiftable portion, and during assembly properly positions the film within the film passageway relative to the lengthwise direction of the film.

REFERENCES:
patent: Re34168 (1993-01-01), Ohmura et al.
patent: 4884087 (1989-11-01), Mochida et al.
patent: 4954857 (1990-09-01), Mochida et al.
patent: 4972649 (1990-11-01), Mochida et al.
patent: 5136313 (1992-08-01), Muramatsu et al.
patent: 5210561 (1993-05-01), Nakai et al.
patent: 5235366 (1993-08-01), Kucmerowski

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