Photography – Exposure control circuit – Having plural photocells
Patent
1994-03-03
1996-11-19
Gellner, Michael L.
Photography
Exposure control circuit
Having plural photocells
396234, G03B 708
Patent
active
055767990
ABSTRACT:
This invention relates to a camera photometry system which uses accumulation-type photoelectric elements to output photometry information related to the brightness of the subject field. Its purpose is to provide a camera photometry system which has a simple structure and which contains a two dimensional photometry mechanism with a wide dynamic photometry range. A camera photometry system using this invention is composed of a two dimensional photometry mechanism made of multiple accumulation-type photoelectric elements, and an accumulation control mechanism which controls the accumulation time of the photoelectric elements, with the system structured so that the multiple photoelectric elements are grouped in separate areas and the accumulation control mechanism is positioned at each of these areas and controls the accumulation time of the photoelectric elements in each separate area.
REFERENCES:
patent: 4821074 (1989-04-01), Nakai et al.
patent: 4835615 (1989-05-01), Taniguchi et al.
patent: 4912495 (1990-03-01), Ishikawa et al.
patent: 4929824 (1990-05-01), Miyazaki
patent: 4979045 (1990-12-01), Taniguchi et al.
patent: 5068737 (1991-11-01), Taniguchi et al.
patent: 5086314 (1992-02-01), Aoki
patent: 5369039 (1994-11-01), Hynecek
patent: 5373340 (1994-12-01), Takagi
patent: 5389995 (1995-02-01), Uchiyama
Gellner Michael L.
Nelson Eric
Nikon Corporation
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