Camera with a motor driven film transport device

Details Camera with a motor driven film transport device Camera with a motor driven film transport device

1982-08-13

1984-07-03

Perkey, William B.

354206, 354214, G03B 1742, G03B 100

Patent

active

044576056

ABSTRACT:
The drive force of a motor built in a camera is separately transmitted through respective clutches to a film drive device for one-frame film wind-up and a shutter mechanism for shutter cocking. The film drive mechanism is associated with a detector for detecting completion of the film wind-up operation, while the shutter mechanism is also associated with another detector for detecting completion of the shutter cocking. The detectors generate a "high" or a "low" digital signal corresponding to the detections. A discriminating circuit logically determines whether the wind-up operation is completed, according to the timed relationship between the signals, and detects the end of the film being reached when the film wind-up has not been terminated upon detection of the shutter cocking completion. By this detection, motor drive for film wind-up is stopped, subsequent shutter release is forbidden and motor drive for film rewinding is initiated.

REFERENCES:
patent: 4196993 (1980-04-01), Stemme et al.
patent: 4309097 (1982-01-01), Stemme et al.

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