ESV readings of toner test patches for adjusting IRD readings of

Details ESV readings of toner test patches for adjusting IRD readings of ESV readings of toner test patches for adjusting IRD readings of

1991-09-05

1993-07-13

McCamish, Marion E.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

430 42, 355247, 355328, G03G 1501

Patent

active

052272702

ABSTRACT:
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).

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