Automatic rewinding camera

Details Automatic rewinding camera Automatic rewinding camera

1982-03-01

1983-08-23

Perkey, William B.

354206, 354213, 354214, 354217, G03B 118, G03B 1736, G03B 1742

Patent

active

044000740

ABSTRACT:
An automatic rewinding camera wherein an automatic advance of the photographic film by one frame is caused by shutter release operation and rewinding of the photographic film is automatically started when the film is prevented from further advance. The camera has a film-driven sprocket wheel, by the rotation of which film movement signals are produced. A timer circuit maintains, during the passage of a predetermined active time which is shorter than the time required to advance the photographic film by one frame, the camera motor in forward rotation so as to advance the photographic film. The timer circuit is reset by the film movement signals. But when those film signals stop, that is, when the film is fully extended from the cartridge, then the timer is not reset; and the measurement of the full predetermined active time, by the timer, without resetting, results in the motor being reversed to rewind the film.

REFERENCES:
patent: 3646867 (1972-03-01), Ono
patent: 4021828 (1977-05-01), Iura et al.
patent: 4105310 (1978-08-01), Hirata et al.
patent: 4294527 (1981-10-01), Hashimoto et al.
patent: 4306794 (1981-12-01), Fukahori et al.

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