Photomeric circuit for camera

Details Photomeric circuit for camera Photomeric circuit for camera

1981-11-30

1983-06-28

Perkey, William B.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354 51, 354 60E, 356215, 356223, 356226, 250214P, G03B 7083, G03B 1718, G01J 146

Patent

active

043902588

ABSTRACT:
A photometric circuit includes a differentiator arranged in cascade connection with an integrating circuit including an integrating capacitor which directly integrates a photocurrent produced by a photoelectric transducer element which is used for photometry. In this manner, a photocurrent output is derived from the integrated output from the integrating circuit.

REFERENCES:
patent: 3641891 (1972-02-01), Burgarella

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