Method of and apparatus for stabilizing electrophotographic imag

Details Method of and apparatus for stabilizing electrophotographic imag Method of and apparatus for stabilizing electrophotographic imag

1978-07-06

1981-02-03

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14D, 355 14CH, 355 77, 430 31, G03G 1500

Patent

active

042485240

ABSTRACT:
This specification discloses a method of and an apparatus for controlling electrophotographic images comprising the steps of detecting the contrast voltage between the surface potentials of the light and dark regions of an electrostatic image formed by the electrophotographic image formation process by taking the difference therebetween, modifying the charging conditions so that the detected contrast may assume a predetermined value, and realizing the substantial background region potential at a predetermined level which would not create fog when said electrostatic image is developed into a visible image, substantially without varying the modified contrast.

REFERENCES:
patent: 2956487 (1960-10-01), Giaimo
patent: 3604925 (1971-09-01), Snelling
patent: 3700323 (1972-10-01), Guyette et al.
patent: 3788739 (1974-01-01), Coriale
patent: 3934141 (1976-01-01), Vargas
patent: 3944354 (1976-03-01), Benwood et al.
patent: 4000944 (1977-01-01), Fraser
patent: 4026643 (1977-05-01), Bergman

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