G - Physics – 03 – G
Patent
G - Physics
03
G
G03G 15/06 (2006.01) B41J 2/41 (2006.01) G03G 13/01 (2006.01) G03G 13/06 (2006.01) G03G 15/00 (2006.01) G03G 15/01 (2006.01)
Patent
CA 2076765
In a single pass tri-level imaging apparatus, a pair of Electrostatic Voltmeters (ESV) are utilized to monitor various control patch voltages to allow for feedback control of Infra-Red Densitometer (IRD) readings. The ESV readings are used to adjust the IRD readings of each toner patch. For the black toner patch, readings of an ESV positioned between two developer housing structures are used to monitor the patch voltage. If the voltage is above target (high development field) the IRD reading is increased by an amount proportional to the voltage error. For the color toner patch, readings using an ESV positioned upstream of the developer housing structures and the dark decay projection to the color housing are used to make a similar correction to the color toner patch IRD readings (but opposite in sign because) for color, a lower voltage results in a higher development field).
Macdonald Daniel W.
Scheuer Mark A.
Sim & Mcburney
Xerox Corporation
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