Photographic camera with exposure control utilizing a phase cont

Details Photographic camera with exposure control utilizing a phase cont Photographic camera with exposure control utilizing a phase cont

1975-08-27

1980-02-26

Adams, Russell E.

354 50, 354 60R, 350330, G03B 956

Patent

active

041903439

ABSTRACT:
A high speed light measuring circuit utilizing a photodiode is combined with a high speed exposure terminating circuit utilizing two polarized filters and a liquid or ferroelectric crystal placed between the polarized filters to constitute an exposure control circuit operative without modification for both daylight and flash exposure.

REFERENCES:
patent: 3433139 (1969-03-01), Beyen et al.
patent: 3476029 (1969-11-01), Schreckendgust
patent: 3641891 (1972-02-01), Burgarella
patent: 3795436 (1974-03-01), Boller et al.
patent: 3815982 (1974-06-01), Wagensonner
patent: 3849786 (1974-11-01), Nanba et al.
patent: 3890628 (1975-06-01), Gurtler

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