Closed-loop developability control in a xerographic copier or pr

Details Closed-loop developability control in a xerographic copier or pr Closed-loop developability control in a xerographic copier or pr

1994-09-29

1996-09-24

Dang, Thu Anh

Photocopying

Contact printing

Light boxes

355246, G03G 2100

Patent

active

055595790

ABSTRACT:
A developer control for enabling the use of developer and toner materials with widely varying At in high quality xerographic copying and printing. Pixel count data is combined with toner test patch reflectance data during a brief toner rundown to determine the rate of change of density per unit change in toner concentration. During toner rundown, dispensing of toner is suspended for a period of time for effecting toner concentration reduction by approximately 0.25%. The change in Toner Concentration (TC) is estimated using pixel counting. Additionally, toner test patches are created and the reflectance thereof is measured for determining the change in toner density. The estimated TC change and the change in toner density are processed using linear regression to find the average change in density sensor output for the estimated change in TC which is referred to as the rundown slope. The rundown slope is then compared to a target value. If it exceeds the target value by more than ? (a noise factor), the dispense setpoint is reduced by one unit. If the rundown slope is less than the target value by more than ?, the dispense point is increased by one unit. The noise factor, ? is attributable to errors in pixel count or reflectance sensor drift. According to the foregoing, the nominal control line and control band in TC-Tribo space is altered to produce a much wider usable At range.

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