Electrophotography – Image formation – Charging
Patent
1995-10-04
1997-11-18
Royer, William J.
Electrophotography
Image formation
Charging
361225, G03G 1502
Patent
active
056897766
ABSTRACT:
A contact charging system uniformly charges a photoconductive surface by the use of a resistive belt surrounding and moved by two rollers and in contact with the photoconductive surface. The roller at the pre-nip area is grounded while that at the post-nip area is kept at a desired high potential. Alternatively, a pair of shoes are used for contact charging a photoconductive surface with one of the shoes being grounded and the other being biased to a desired DC potential by a biasing source. A resistive film is in contact with the pair of shoes with both the film and shoes being in contact with the photoconductive surface. Also, a blade is used to uniformly charge a photoconductive surface with one portion of the blade being grounded and another portion being biased to a desired DC potential. The blade is in direct contact with the photoconductive surface. This charging system tailors the electric field so that air breakdown only occurs at the post-nip area.
REFERENCES:
patent: 2912586 (1959-11-01), Gundlach
patent: 3398336 (1968-08-01), Martel et al.
patent: 4380384 (1983-04-01), Ueno et al.
patent: 4922299 (1990-05-01), Uchimoto et al.
patent: 5126913 (1992-06-01), Araya et al.
Mashtare Dale R.
Radcliffe Andrew B.
Henry II William A.
Royer William J.
Xerox Corporation
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