Electrostatographic apparatus comprising improved developing bia

Details Electrostatographic apparatus comprising improved developing bia Electrostatographic apparatus comprising improved developing bia

1979-01-23

1980-07-22

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118668, 355 3DD, 355 10, G03G 1500

Patent

active

042136938

ABSTRACT:
A photoconductive drum (12) is electrostatically charged and radiated with a light image of an original document (16) to form an electrostatic image. The average value of the electrostatic potential of the electrostatic image is sensed and a developing bias voltage controlled in accordance therewith. The bias voltage is progressively increased when the sensed electrostatic potential is below a predetermined value and is reduced to a lower value when the electrostatic potential exceeds the predetermined value. The electrostatic potential is below the predetermined value for original documents constituted by printed pages and above the predetermined value for original documents constituted by photographs and other continuous tone documents.

REFERENCES:
patent: 4035071 (1977-07-01), Miyakawa et al.
patent: 4050806 (1977-09-01), Miyakawa et al.
patent: 4087171 (1978-05-01), Yano
patent: 4139299 (1979-02-01), Miyakawa et al.

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