Electrophotography – Supplemental electrophotographic process
Patent
1997-04-17
1998-05-26
Lee, S.
Electrophotography
Supplemental electrophotographic process
G03G 2100
Patent
active
057582343
ABSTRACT:
An apparatus and method for depositing toner on substantially the entire surface of the photoconductor to minimize print defects associated with surface contamination. This is accomplished by printing a background pattern along with the desired image. A light film of toner is deposited on the background areas of the photoconductor while a more dense film of toner is deposited on the image areas. The invention may be implemented by merging a background pattern, such as a uniform level of gray, with the print image data or by varying the charging conditions at photoconductive drum. In one implementation of the invention, a background pattern such as a uniform level of gray is printed by scanning the pattern onto the photoconductor as part of the imaging light exposure process. In a second implementation of the invention, the background gray is printed by adjusting the charging potential applied to photoconductor and/or the various roller bias voltages.
REFERENCES:
patent: 4304486 (1981-12-01), Cormier et al.
patent: 5072258 (1991-12-01), Harada
patent: 5255057 (1993-10-01), Stelter et al.
patent: 5361123 (1994-11-01), Yeh et al.
Binder Andrew J.
Phillips Quintin T.
Hewlett--Packard Company
Lee S.
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