Automatic exposure device for copying machine

Details Automatic exposure device for copying machine Automatic exposure device for copying machine

1989-11-22

1991-05-14

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 69, G03B 2772

Patent

active

050160460

ABSTRACT:
An automatic exposure device for a copying machine includes a lamp for exposing an original, a power source for variably supplying electric power to the lamp, a first sensor for determining the quantity of light reflected from the original, a second sensor for determining the quantity of light of the lamp, a controller for increasing the electric power supplied to the lamp by the power source proportionally to decrease in the quantity of the light determined by the first sensor, and a maximum electric poewr setting device for setting the maximum electric power applicable to the lamp by the power source at a high level proportional to decrease in the quantity of light determined by the second sensor.

REFERENCES:
patent: 4540279 (1985-09-01), Irie et al.
patent: 4843208 (1989-06-01), French et al.

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