Light measuring circuit for photographic cameras

Details Light measuring circuit for photographic cameras Light measuring circuit for photographic cameras

1980-04-23

1982-01-19

Adams, Russell E.

354 51, 354 60E, G03B 700

Patent

active

043113753

ABSTRACT:
A photo-electric converting element converts an incident light into a photo-electric signal corresponding to the illumination of the incident light. The photo-electric signal converted is amplified by a plurality of amplifiers. A discriminating circuit judges under which of a plurality of illumination ranges from low to high illumination the incident light corresponding to the photo-electric signal falls. In accordance with the signal of the judging circuit, an output signal is taken out from the amplifier corresponding to the illumination range of the incident light.

REFERENCES:
patent: 3971046 (1976-07-01), Nobusawa
patent: 4006484 (1977-02-01), Nobusawa
patent: 4112439 (1978-09-01), Kawasaki et al.
patent: 4192586 (1980-03-01), Orban
Ryoko Giho, Oct. 1, 1976, vol. 13, No. 154, col. name, "Photographic Apparatus HFM".

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