Electrical shutter circuit for camera

Details Electrical shutter circuit for camera Electrical shutter circuit for camera

1975-03-05

1977-01-04

Hix, L. T.

354 60L, G03B 1720, G03B 708

Patent

active

040018458

ABSTRACT:
An electrical shutter circuit for a camera includes a photoelectric transducer element which is responsive to light from an object being photographed to determine a proper exposure period in accordance with the brightness thereof, thus automatically controlling the operation of a shutter assembly which opens or closes an exposure light path. In the open position of the shutter assembly, the photoelectric transducer element is irradiated with light of a fixed, relatively low intensity emitted by a luminescent element so that the electrical shutter circuit is automatically operated for the closing operation after a period of time determined by the light from the luminescent element even if the incident light from the object being photographed is extremely weak or completely absent.

REFERENCES:
patent: 3470798 (1969-10-01), Miyakawa
patent: 3690229 (1972-09-01), Kikuchi et al.
patent: 3698298 (1972-10-01), Kikuchi et al.
patent: 3860936 (1975-01-01), Harvey

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