Patent
1982-09-27
1984-08-14
Adams, Russell E.
354214, G03B 118
Patent
active
044653514
ABSTRACT:
A motor-operated film driving device for cameras is composed of a motor driving circuit switchable from a first state for driving a motor forward for film winding to a second state for short-circuiting the motor and further to a third state for driving the motor reverse for rewinding the film, a film tension detection circuit for generating a detection signal when it detects film over-tension which occurs upon completion of exposure of all its frames and a delay circuit which generate a delay signal upon the lapse of a predetermined time from the moment of generation of the detection signal. The motor driving circuit switches from the first state to the second state in response to the detection signal, and from the second state to the third state in response to the delay signal.
REFERENCES:
patent: 3598033 (1971-08-01), Sasaki
patent: 3946409 (1976-03-01), Toyoda
patent: 4112449 (1978-09-01), Akasaka
patent: 4306794 (1981-12-01), Fukahori et al.
patent: 4400074 (1983-08-01), Akiyama et al.
Adams Russell E.
Minolta Camera Kabushiki Kaisha
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