Browse Prior Art Database

OPTICAL SCANNING

IP.com Disclosure Number: IPCOM000024147D
Original Publication Date: 1979-Oct-31
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal

Abstract

In a scanning system of a copying machine, a conventional catadioptic lens is replaced by a Fresnel catadioptic lens 1. This makes the effective aperture of the system larger and a low wattage lamp can be used. Fresnel elements also tend to be cheaper than spherical lenses. A half-rate scanning system is shown which has a