Exposure control system for photographic copying machines

Details Exposure control system for photographic copying machines Exposure control system for photographic copying machines

1978-01-26

1980-05-27

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 83, G03B 2778

Patent

active

042047340

ABSTRACT:
The exposure control of a photographic copying machine has several detectors which are exposed to surrounding light as well as to original-modulated copying light to transmit first signals which denote the color composition and/or density of originals. The influence of surrounding light upon the first signals is compensated for by discrete circuits which generate and store second signals corresponding to those portions of first signals which are attributable to the influence of surrounding light upon the respective detectors. The second signals are subtracted from first signals during exposure of an original to copying light whereby the resulting third signals denote the color composition and/or density of the original as if the detectors were not exposed to surrounding light.

REFERENCES:
patent: 3222983 (1965-12-01), Ouchi

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