Exposure control arrangement for photographic cameras

Details Exposure control arrangement for photographic cameras Exposure control arrangement for photographic cameras

1979-12-07

1981-10-27

Gellner, Michael L.

354 43, 354 50, G03B 7097

Patent

active

042970121

ABSTRACT:
An exposure control arrangement for use in photographic cameras employing digital circuitry and a microprocessor for practical and rational expsoure control of the photographic camera through simple construction at high reliability. The arrangement utilizes a single A-D converter to digitize various analog signals corresponding to the measured light value, set exposure time, set film sensitivity, etc. A single timer circuit to generate substantially all of the time references is used by the arrangement. The microprocessor, connected to the timer circuit and A-D converter controls the operation of the arrangement. The commonality of usage of the A-D converter, timer circuit, and microprocessor decreases the arrangement's size, cost, and complexity while increasing the arrangement's overall reliability.

REFERENCES:
patent: 3842587 (1974-10-01), Strauss et al.
patent: 3903528 (1975-09-01), Kee
patent: 4103307 (1978-07-01), Shinoda et al.
patent: 4106033 (1978-08-01), Nakamoto et al.
patent: 4137541 (1979-01-01), Mashimo et al.
patent: 4167312 (1979-09-01), Shinoda et al.

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