The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 1996
Filed:
Sep. 29, 1994
Mark A Gwaltney, Fairport, NY (US);
Robert E Grace, Fairport, NY (US);
Xerox Corporation, Stamford, CT (US);
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.