Photometric device for use in a single lens reflex camera

Details Photometric device for use in a single lens reflex camera Photometric device for use in a single lens reflex camera

1975-03-05

1977-04-19

O'Connor, Edna M.

354 31, 354 56, 354225, G03B 1912, G03B 1302

Patent

active

040191915

ABSTRACT:
A photometric device for use in a single lens reflex camera comprising a photometric optical system and a light receiving element disposed behind a pentaprism is disclosed. The light receiving element is disposed at a position where the image of a subject, imaged on a focusing glass plate by the photographing lens, is refocused by the photometric lenses. The light receiving area of the light receiving element is sized so that only a portion of the light refocused by the photometric lenses is received to provide a photometric operation that gives priority to a portion of the subject image.

REFERENCES:
patent: 3106129 (1963-10-01), Frenk et al.
patent: 3513759 (1970-05-01), Kondo
patent: 3532043 (1970-10-01), Shimomura et al.
patent: 3649112 (1972-03-01), Sherwood
patent: 3724349 (1973-04-01), VON Belvard et al.
patent: 3762286 (1973-10-01), Hasegawa
patent: 3855601 (1974-12-01), Uchiyama et al.
patent: 3884584 (1975-05-01), Tsunekawa et al.

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