Photocopying – Contact printing – Light boxes
Patent
1991-09-05
1992-10-20
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355228, 355328, G03G 1500, G03G 1504
Patent
active
051574411
ABSTRACT:
A single pass tri-level imaging apparatus and method. Compensation for the effects of dark decay on the background voltage, V.sub.Mod, and the color toner patch, V.sub.tc readings is provided using two ESVs (ESV.sub.1 and ESV.sub.2), the former located prior to the color or DAD housing and the latter after it. Since the CAD and black toner patch voltages are measured (using ESV.sub.2) after dark decay and CAD voltage loss have occurred, no compensation for these readings is required. The DAD image voltage suffers little dark decay change over the life of the P/R so the average dark decay can be built into the voltage target.
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Berman Robin E.
Donaldson Patricia J.
Hurwitch Carl B.
MacDonald Daniel W.
Palumbo Kenneth S.
Pendegrass Joan H.
Xerox Corporation
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