Exposure control device in a camera using an electro-optic light

Details Exposure control device in a camera using an electro-optic light Exposure control device in a camera using an electro-optic light

1975-09-12

1977-10-18

Adams, Russell E.

354 23D, G03B 956

Patent

active

040548902

ABSTRACT:
An exposure control device in a camera comprises light intercepting means disposed between a picture-taking lens and a film and in the light path of the picture taking lens and retractable out of the light path by operation of a shutter release member, electro-optic light control means disposed in the light path of the picture-taking lens and having its transmittivity to light variable by an electrical signal, and control means operable in response to the retracting movement of the light intercepting means out of the light path to apply a first signal to the light control means for increasing its transmittivity, apply a second signal to the light intercepting means for returning the same to the light path in order to terminate the exposure of the film to light, and apply a third signal to the light control means for decreasing it transmittivity to a minimum.

REFERENCES:
patent: 3476029 (1969-11-01), Schreckendgust
patent: 3890628 (1975-06-01), Gurtler
patent: 3909137 (1975-09-01), Kisanuki
patent: 3928858 (1975-12-01), Sakurada et al.

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