Photocopying – Contact printing – Light boxes
Patent
1994-02-23
1995-03-28
Royer, William J.
Photocopying
Contact printing
Light boxes
118689, 355208, G03G 2100
Patent
active
054022142
ABSTRACT:
A system controls the concentration of toner in developer in an electrophotographic printer. Toner is applied on a test patch on a charge-retentive surface in a manner consistent with a desired toner density on a test patch, and the actual toner density on the test patch is measured. The charge applied to the charge-retentive surface is then adjusted in response to the measured actual toner density to obtain the desired toner density on a subsequent test patch. The change in charge applied to the charge-retentive surface is used to detect a shortage of toner in the developer.
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Hutter R.
Royer William J.
Xerox Corporation
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