Exposure compensation circuit for a copier

Details Exposure compensation circuit for a copier Exposure compensation circuit for a copier

1979-09-19

1981-06-09

Hartary, Joseph W.

Photocopying

Projection printing and copying cameras

Illumination systems or details

315151, 315241R, G03B 2772

Patent

active

042721881

ABSTRACT:
An automatic exposure control system for a full-frame copier controls the illumination of a flash lamp in response to the reflectivity of a document to be reproduced. A photodetector senses exposure at the wall of a light housing and after sufficient exposure is reached, the light source is turned off (quenched). A compensation circuit anticipates the total energy emitted after quench (representing an over exposure potential) and terminates the light source energizing pulse so as to produce only desired exposure without over-exposure error.

REFERENCES:
patent: 3519879 (1970-07-01), Ogawa
patent: 3697177 (1972-10-01), Booth
patent: 3737721 (1973-06-01), Ogawa
patent: 3774072 (1973-11-01), Ogawa
patent: 3947117 (1976-03-01), Basu et al.
patent: 3985440 (1976-10-01), Dennhardt et al.
patent: 3998547 (1976-12-01), Schroter et al.
patent: 4017180 (1977-04-01), Yen et al.
patent: 4093376 (1978-06-01), Rabindran et al.
patent: 4101812 (1978-07-01), Muller et al.

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