Electrostatographic apparatus comprising document density sensin

Details Electrostatographic apparatus comprising document density sensin Electrostatographic apparatus comprising document density sensin

1978-08-21

1980-04-29

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118647, 250205, 355 3DD, 355 8, 355 14D, 355 68, G03G 1500

Patent

active

042003911

ABSTRACT:
Prior to optical scanning of an original document (14) for producing an electrostatic image thereof on a photoconductive drum (12), the optical density of the document (14) is sensed and a light image intensity and a developing bias voltage are set in accordance with a sensed minimum or background density of the document (14).

REFERENCES:
patent: 3635555 (1972-01-01), Kurahashi et al.
patent: 4093376 (1978-06-01), Rabindran
patent: 4124295 (1978-11-01), Gardiner

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