Patent
1976-08-24
1978-08-01
Gellner, Michael L.
354 51, 354 56, 354 57, G03B 708
Patent
active
041046544
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. A second photoelectric transducer element is provided for receiving reflected light from the reflecting mirror that is adapted to be switched between the viewfinder light path and the photographic light path and display means for displaying the operation of the shutter dependent upon the light which is incident upon the aforesaid second transducer element.
REFERENCES:
patent: 3842424 (1974-10-01), Tsunekawa et al.
patent: 3855603 (1974-12-01), Ichihashi
patent: 3896472 (1975-07-01), Yoshiyama et al.
Hashimoto Akihiko
Kitagawa Masahiro
Maitani Yoshihisa
Shimoyama Kunio
Yoshida Muneaki
Gellner Michael L.
Olympus Optical Co,. Ltd.
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