Patent
1976-08-24
1977-12-27
Hix, L. T.
354 59, 354 51, 354 60R, G03B 708
Patent
active
040657779
ABSTRACT:
A photometric apparatus for single lens reflex camera and of the type in which an exposure value is determined by photometry of light which is transmitted through a photographic optical system and is reflected by at least one of the surfaces of a shutter blind and a film, said apparatus comprising a photoelectric transducer element for receiving light reflected by at least one of the surfaces of a shutter blind and a film, and an operational amplifier for biasing the photoelectric transducer element to maintain the voltage applied thereacross substantially null, thereby enabling a photometric output of the photoelectric transducer element to be effectively derived even when the amount of light received is minimal. The shutter blind is provided with a surface upon which at least two portions thereof have different coefficients of reflectivity to reduce adverse effects of reflected light upon the desired exposure period.
REFERENCES:
patent: 2302597 (1942-11-01), Bing
patent: 3536408 (1970-10-01), Norwood
patent: 3679905 (1972-07-01), Watanabe
patent: 3685423 (1972-08-01), Dahlgren
patent: 3726197 (1973-04-01), Hasegawa et al.
patent: 3730063 (1973-05-01), Kobayashi et al.
patent: 3744385 (1973-07-01), Burgarella et al.
Hashimoto Akihiko
Kitagawa Masahiro
Maitani Yoshihisa
Shimoyama Kunio
Yoshida Muneaki
Hix L. T,.
Olympus Optical Company Ltd.
Perkey William B.
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