Automatic exposure device

Details Automatic exposure device Automatic exposure device

1987-08-27

1989-01-03

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 14E, 355 69, G03B 2772, G03G 1500

Patent

active

047960604

ABSTRACT:
An automatic exposure device for a photocopying machine. A signal indicative of exposure light intensity and a signal indicative of the received light intensity from an original are obtained by initially exposing two types of original documents the densities of which are different from each other. A proper exposure light intensity is established corresponding to the density of the original document to be copied on the basis of the above-obtained intensities. If the exposure light intensity changes in accordance with the density of an original document and the exposure light intensity to be changed should exceed an upper limit value or be less than a lower limit value, that limit value is established as the proper exposure light density.

REFERENCES:
patent: 4542985 (1985-09-01), Honma et al.
patent: 4684239 (1987-08-01), Takayanagi et al.

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