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FRESNEL LENS CORRECTOR FOR BOOK COPYING

IP.com Disclosure Number: IPCOM000026000D
Original Publication Date: 1989-Aug-31
Included in the Prior Art Database: 2004-Apr-05

Publishing Venue

Xerox Disclosure Journal

Abstract

Book copying has proved difficult to accomplish in most conventional copiers. There are three primary problems which recur; e.g., dark copy near the binding; out of focus information near the binding and distorted information near the binding. For many books, the first two defects can be reduced to an acceptable level by pressing down on the binding but the distortion problem remains. This distortion problem is more serious in the large field angle flash copiers and is also noticeable in scanners, depending on the book orientation. The distortion may significantly be reduced for all systems by introducing a Fresnel lens under a document platen to collimate the chief rays.