Photometric circuit for camera

Details Photometric circuit for camera Photometric circuit for camera

1984-12-06

1987-11-03

Perkey, W. B.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356222, 250211J, 250214P, 250209, 357 30, G03B 708, G01J 142, H01J 4002, H01L 3102

Patent

active

047040246

ABSTRACT:
A photometric circuit for a camera has a photo-electric conversion element arranged to measure light in the middle part of the angle of view of the camera and a plurality of photo-electric conversion elements arranged to measure light in the peripheral parts of the angle of view. Of these peripheral light measuring elements, the elements disposed symmetrically with each other relative to the middle part of the angle of view are paired and connected in series with each other. Further, the series circuits thus formed are connected in parallel with the middle light measuring element.

REFERENCES:
patent: 3450016 (1969-06-01), Yamada
patent: 3473453 (1969-10-01), Gross
patent: 3762294 (1973-10-01), Kosaka et al.
patent: 4218623 (1980-08-01), Utagawa
patent: 4320948 (1982-03-01), Hosoe et al.
patent: 4364650 (1982-12-01), Terashita et al.
patent: 4420252 (1983-12-01), Nakauchi

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