Exposure control system

Details Exposure control system Exposure control system

1974-06-17

1976-03-30

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

250205, 315151, 355 83, G03B 2774, G03B 2778, H05B 3702, G01J 132

Patent

active

039471179

ABSTRACT:
An automatic exposure system for a copying machine which includes a scanning optical system having a prescan period, comprising a lamp illumination control to receive light reflected from an original document to be copied, a lamp illumination control circuit and a synchronizing circuit, said control loop being arranged to adjust the illumination provided by the lamp means during the prescan period to maintain the intensity of light being received by an image forming surface from the original document at a predetermined level.

REFERENCES:
patent: 3728023 (1973-04-01), Stevko et al.
patent: 3743405 (1973-07-01), Morse et al.
patent: 3746446 (1973-07-01), Sliwkowski
patent: 3795444 (1974-03-01), Glidden et al.

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