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

Publishing Venue

Xerox Disclosure Journal


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