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Browse Prior Art Database

EDGE/PITCH FADE OUT SYSTEM

IP.com Disclosure Number: IPCOM000025682D
Original Publication Date: 1987-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 39K

Publishing Venue

Xerox Disclosure Journal

Abstract

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.

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XEROX DISCLOSURE JOURNAL

EDGE/PITCH FADE OUT SYSTEM

Proposed Abraham Cherian Classification

U.S. c1.355/3 Int. C1. G03g 15/00

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.

Volume 12 Number 2 March/April 1987 83

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  XEROX DISCLOSURE JOURNAL Volume 12 Number 2 March/April 1987

84

[This page contains 1 picture or other non-text object]