Patent ID: 6201936
Filing Date: 2001-03-13
Classification: G03G

Abstract:
A process control method for maintaining a preselected developed mass per unit area (DMA) of black solid area in a xerographic printer, the method comprising:generating a first test patch having a first DMA and a first test patch voltage;sensing said first DMA and said first test patch voltage;generating a second test patch having a second DMA and a second test patch voltage;sensing said second DMA and said second test patch voltage;generating a black solid area control patch and sensing the control patch voltage associated therewith;calculating a developability curve from the sensed DMA readings and the sensed test patch voltages;projecting said developability curve into a region where DMA cannot be sensed by a toner density sensor;estimating the DMA of the black solid area control patch using the projected developability curve and the sensed control patch voltage;comparing the estimated DMA with the preselected DMA; andadjusting a development field of the xerographic printer during run-time operation such that black solid area is returned to the preselected DMA.