Cameras employing interchangeable automatic exposure control dev

Details Cameras employing interchangeable automatic exposure control dev Cameras employing interchangeable automatic exposure control dev

1974-12-03

1976-04-13

Peters, Jr., Joseph F.

354 60R, 354152, 354288, G03B 708, G03B 1700

Patent

active

039507688

ABSTRACT:
Automatic exposure time control apparatus in an interchangeable pentaprism device and manually adjustable exposure time control apparatus in a camera body are selectively operable and employ separate switching circuits which, after opening of the shutter, are responsive to associated time-varying signals for de-energizing an electromagnet in the camera body at the end of the corresponding exposure time interval, thereby to release a shutter-closing member.

REFERENCES:
patent: 3733984 (1973-05-01), Yato
patent: 3812499 (1974-05-01), Hayashi et al.

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