Photocopying – Contact printing – Light boxes
Patent
1990-10-24
1992-06-02
Moses, R. L.
Photocopying
Contact printing
Light boxes
355246, 355326, 356445, 250205, G03G 1500
Patent
active
051191326
ABSTRACT:
The present invention relates generally to an electrographic apparatus and more specifically to an improved structural arrangement in electrographic apparatus of the type having a densitometer, which arrangement achieves improved measuring of marking particle density on a photoreceptor or the like. Wherein, use of a charge-coupled device (CCD) allows for a pixel-by-pixel recordation of the photo intensity reflected off of the photoreceptor and toner test patch. Therefore, as a result of the increased sensitivity of the toner measuring, it is possible to measure denser patches of toner, both black as well as color. Thus allowing for accurate monitoring of the amount of toner capable of being placed onto a photoreceptor.
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Moses R. L.
Xerox Corporation
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