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EDGE/PITCH FADE OUT SYSTEM Disclosure Number: IPCOM000025682D
Original Publication Date: 1987-Apr-30
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


In an electrophotographic printing machine it is necessary to erase selected charged areas of the photoconductive surface between successive electrostatic latent images (pitch fade out) and along the edges (edge erase) of the latent image recorded thereon. This may be achieved by a light source which transmits collimated light rays continuously through a liquid crystal display (LCD) shutter. A lens is employed to collimate the light rays emitted from the light source. Flare light is minimized by using a shroud. The LCD segments are turned on or off depending upon the width of the copy sheet and pitch fade out requirements.