Camera exposure control system

Patent

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G03B 700

Patent

active

045589348

ABSTRACT:
A film speed correction circuit for electrically controlled cameras having aperture or shutter speed controlled responsively to ambient light sensings from a photosensor features a controllable multi-stage amplifier preferably interposed between the photosensor and the aperture or shutter control means. The amplifier features a plurality of cascaded stages, each stage being operated to two different gain values according to a sensing signal provided thereto, the sensing signals for each stage being derived from coded insulating and conducting areas on the outer surface of the film cassette. Use of active stages interposed between passive attenuating stages substantially eliminates interstage loading and allows the use of standard resistance values to provided proper gain values for each stage.

REFERENCES:
patent: 4200371 (1980-04-01), Suzuki et al.
patent: 4431283 (1984-02-01), Hoda et al.

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