Photometric apparatus for single lens reflex camera

Details Photometric apparatus for single lens reflex camera Photometric apparatus for single lens reflex camera

1974-09-13

1976-11-23

Peters, Jr., Joseph F.

354 23R, 354 60R, G03B 708

Patent

active

039940012

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.

REFERENCES:
patent: 3679905 (1972-07-01), Watanabe
patent: 3687026 (1972-08-01), Kobayashi et al.
patent: 3726197 (1973-04-01), Hasegawa et al.
patent: 3744385 (1973-07-01), Bungarella et al.

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