Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1982-06-07
1985-01-08
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214L, 354425, 354429, 356222, 356223, G03B 7083
Patent
active
044928580
ABSTRACT:
A photometric circuit comprises an operational amplifier including a plurality of differential amplifiers, a constant current bias circuit for supplying a constant current bias to the differential amplifiers, and a bias control switching circuit which selectively connects the constant current bias circuit to one of the plurality of differential amplifiers in response to an external signal. A plurality of photoelectric transducer elements, used for purpose of photometry, are connected to differential inputs corresponding to the plurality of differential amplifiers, and the transducer element is selectively enabled for photometry in accordance with the external signal.
REFERENCES:
patent: 4027314 (1977-05-01), Iguchi et al.
patent: 4096491 (1978-06-01), Wagensonner et al.
patent: 4166680 (1979-09-01), Maitani
Japanese Laid Open Patent Publication No. Sho54-43727, filed 13 Sep. 1977; inventor-Kobori et al.; Appln. No. Sho52-110780.
Japanese Laid Open Patent Publication No. Sho53-36229, filed 16 Sep. 1976; inventor-Miyata et al.; Appln. No. Sho51-111-46.
Olympus Optical Co,. Ltd.
Weinstein Louis
Westin Edward P.
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