System for digitally controlling exposure time of camera

Details System for digitally controlling exposure time of camera System for digitally controlling exposure time of camera

1975-07-02

1976-11-16

Adams, Jr., Russell E.

Photocopying

Projection printing and copying cameras

Illumination systems or details

354 23D, 354 31, 354 50, 354 60A, G03B 2774, G03B 2778

Patent

active

039920984

ABSTRACT:
A system is disclosed for measuring the background density of an object to be photographed wherein a count is inserted into a counter proportional to the measured density. The intensity of illumination of the object is thereafter measured and the count within the counter is counted down at a rate proportional to the measured illumination intensity until the count reaches zero; the beginning of the exposure interval being defined by the start of the countdown step and the end of the interval being defined by the count in the counter reaching a predetermined value.

REFERENCES:
patent: 3528749 (1970-09-01), Bowker
patent: 3542470 (1970-11-01), Ost
patent: 3663110 (1972-05-01), Rising
patent: 3879135 (1975-04-01), Egli et al.

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