Flash exposure system

Details Flash exposure system Flash exposure system

1979-06-29

1982-06-15

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2780

Patent

active

043347673

ABSTRACT:
An automatic exposure control system for a document copying machine is provided which includes a flash illumination system, a light intensity sensor positioned to directly view the document to be copied, and an illumination control means operatively associated with the sensor to control the mount of energy supplied to the illumination system in response to the energy of the sensed reflected light from the document.

REFERENCES:
patent: 3177764 (1965-04-01), Akima
patent: 3398635 (1968-08-01), De Boer
patent: 3649118 (1972-03-01), Yano et al.
patent: 3734630 (1973-05-01), McIntosh et al.
patent: 3947117 (1976-03-01), Basu et al.
patent: 4017180 (1977-04-01), Yen et al.

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