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Browse Prior Art Database

DOCUMENT REGISTRATION APPARATUS FOR FEEDER OR MANUAL PLATEN

IP.com Disclosure Number: IPCOM000026376D
Original Publication Date: 1991-Aug-31
Included in the Prior Art Database: 2004-Apr-05

Publishing Venue

Xerox Disclosure Journal

Abstract

A document registration apparatus for feeder or manual platen covers for use in electrophotographic printing and copying machines is disclosed. A platen cover or a document handler belt that overlays a document during scanning is covered, all or in part, with a retro reflective material, for example, as available from 3M Corporation. Retro reflective materials have a characteristic brightness that is 10 to 1000 times brighter than white reflection because on-axis illumination is returned directly along the same axis as the incident illumination. In combination with a suitable light source and photodetectors, the retro reflective material serves as a means for detecting document size and position. This apparatus provides significantly improved registration signal levels over previously described methods. A related registration and detection scheme has been disclosed in U.S. Patent 4,538,185 to Wiggins, issued August 27,1985