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ELECTROPHOTOGRAPHIC PRINTER PROCESS CONTROL WITH A BINARY ROS

IP.com Disclosure Number: IPCOM000025955D
Original Publication Date: 1989-Apr-30
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine employing a laser, there is a need to determine the shape of the photoreceptor photodischarge curve in order to facilitate process control setup. This curve is second order with respect to exposure. Therefore, a minimum of three points in the discharge voltage versus exposure space are required to specify the curve in a write-white or write-background system. These three points are typically the dark voltage, the background or full-discharge voltage and some intermediate point. In systems using a multilevel output ROS, this intermediate discharge level can be obtained by selecting one of the intermediate values needed for the process control setup. A laser raster output scanner (ROS) transforms a temporal modulation of input control voltage into a spatial modulation at the photoreceptor. The hotoreceptor integrates the energy deposited by the