Copying apparatus provided with an automatic light exposure cont

Details Copying apparatus provided with an automatic light exposure cont Copying apparatus provided with an automatic light exposure cont

1988-03-25

1990-03-20

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355 69, 355214, G03G 2100, G03G 1504, G03G 2772

Patent

active

049105540

ABSTRACT:
A copying apparatus is provided with an automatic light exposure control system for setting the amount of light from a light source on the basis of light reflected by an original document to which light from the light source is applied, the amount of light in a plurality of levels is applied to a reference document so that data of light reflected from the reference document may be stored in the apparatus. When a certain document is copied, the amount of light from the light source is automatically controlled on the basis of the data of reflected light of the document to be copied and the data of reflected light of the reference document stored in the apparatus.

REFERENCES:
patent: 4136277 (1979-01-01), Gerrard
patent: 4354758 (1982-10-01), Futaki
patent: 4699502 (1987-10-01), Araki et al.
patent: 4714945 (1987-12-01), Fujiwara et al.
patent: 4755852 (1988-07-01), Fujita

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