Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – To produce color reproduction
Patent
1996-03-05
1998-02-10
Chapman, Mark
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
To produce color reproduction
430 45, 430 54, 399 46, 399 50, 399 51, 399 53, 399 54, 399151, 399178, 399223, G03G 1301
Patent
active
057167443
ABSTRACT:
An electrophotographic printer produces a multi-color image on a moving photoconductor (OPC) and includes a laser/scanner arrangement for producing first and second beams to expose the OPC at spaced-apart exposure stations. The OPC is charged to a reference state prior to exposure. First and second developer stations are positioned between the first and second beam exposure stations and third and fourth developer stations are positioned after the second beam exposure station in the direction of movement of the OPC. A controller modulates the laser, during each scan, in accordance with subpixel color data from a pair of color planes to achieve a tri-level charge state (including the reference state) on the OPC. The first and second developer stations apply charged toners, selectively, in accord with the tri-level charge state produced by the scan of the first beam. The third and fourth developer stations apply charged toners, selectively, in accord with the tri-level charge state produced by the scan of the second beam. Because certain of the applied toners may deposit over OPC areas previously toned, the color toners are modified to assure faithful color reproduction, even if an overtoning action occurs.
REFERENCES:
patent: 5314774 (1994-05-01), Camis
patent: 5534990 (1996-07-01), Harris
patent: 5552253 (1996-09-01), Kovacs et al.
Proceedingss 6Th Annual Laser Printing Conf., Jul., 1995, H. M. Stark, "An Overview Of The Tri-Level Xerographic Process" (pp. 1-15).
Chapman Mark
Hewlett--Packard Company
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