Electrophotography – Control of electrophotography process – Of plural processes
Reexamination Certificate
2007-01-09
2007-01-09
Ngo, Hoang (Department: 2852)
Electrophotography
Control of electrophotography process
Of plural processes
Reexamination Certificate
active
10999326
ABSTRACT:
Using a document scanner or other image input device of an image or document processing system to periodically scan or image printed test images from a plurality of marking engines replaces internal sensors as a feedback means in image quality control. For example, image lightness (L*) is controlled by periodically printing mid-tone test patches, scanning the printed test patches with a main job document scanner and analyzing the scanned image to determine updated marking engine actuator set points. For instance, ROS exposure and/or scorotron grid voltages are adjusted to maintain image lightness consistency between marking engines.
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Enskat Tim D. M.
Grace Robert E.
Griffith Hugh W.
Less Krzysztof J.
Mongeon Michael C.
Fay Sharpe Fagan Minnich & McKee LLP
Ngo Hoang
Palazzo Eugene O.
Xerox Corporation
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