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PLASTIC ATTENUATORS FOR LAMP ADJUSTMENT AND AXIAL PROFILE SHAPING

IP.com Disclosure Number: IPCOM000025013D
Original Publication Date: 1983-Apr-30
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal

Abstract

Figure 1 illustrates, in end view, a portion of an optical illumination system in which a document 10 lying on a platen 12 is illuminated by a lamp assembly 14. Assembly 14 comprises an apertured fluorescent lamp 14 having an attenuator element 18 positioned over lamp aperture 20. The purpose of element 18 is to compensate for axial intensity variation of lamp 14. Examples of possible alternative patterns are shown in Figures 2a, 2b. Here, element 18 is formed as a clear plastic strip 20 with a dot screen pattern (Figure 2a) or a line screen pattern (Figure 2b) formed on the surface. The dots or lines are spaced further apart at