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US 5,689,776 AGranted
Contact charging system for uniformly charging a charge retentive surface
AssigneeXerox Corporation
InventorsAndrew B. Radcliffe, Dale R. Mashtare
Life of this patent
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AssigneeXerox Corporation
InventorsAndrew B. Radcliffe, Dale R. Mashtare
Estimating the term…
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.
A printing apparatus adapted to print page image information onto copy sheets from a photoconductive surface and including a contact charging system for uniformly charging the photoconductive surface by tailoring electric fields, comprising:
A printing apparatus adapted to print page image information onto copy sheets from a photoconductive surface and including a contact charging system for uniformly charging the photoconductive surface by tailoring electric fields, comprising:
A printing apparatus adapted to print page image information onto copy sheets from a photoconductive surface and including a contact charging system for uniformly charging the photoconductive surface by tailoring electric fields, comprising:
Dependencies are inferred from the claim text.