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OPTICAL SYSTEM TO REDUCE POLYGON SCAN ANGLE OF SMALL NUMBER OF FACET

IP.com Disclosure Number: IPCOM000022875D
Original Publication Date: 1976-Mar-31
Included in the Prior Art Database: 2004-Mar-27

Publishing Venue

Xerox Disclosure Journal

Abstract

It is desirable to have a large polygon facet width in a laser scanning system especially when the system requires a very small spot. In most cases the system is a diffraction limited system and the facet width is the limiting aperture of the system. When making the facets wider, the diameter of the polygon becomes larger0 In some cases this becomes very impractical0 In order to minimize the diameter of the polygons, the number of facets on the polygon may be reduced and the facet width increased0 This will introduce another problem, that is, the angular scanning efficiency will be reduced, or, in other words, the dead time between scans will increase which makes the system very inefficient0 However, this may be overcome by reducing the number of facets to accommodate wider facets and reducing the scanning angle to increase efficiency. The polygon 1 reflects a laser beam 2 through a scan angle of c'~ to a reflective or refractive aplanatic system 3 which changes the beam scan angle to ~ (~