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OPTICAL SYSTEM FOR A RASTOR OUTPUT SCANNER

IP.com Disclosure Number: IPCOM000026087D
Original Publication Date: 1990-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 110K

Publishing Venue

Xerox Disclosure Journal

Abstract

The optical system consists of the pre-polygon sections. The pre-polygon section changes the beam emerging from the modulator, to the conditions required at the polygon facet. It is also called the beam-conditioning optics. In the scan plane, the beam from the modulator has a waist radius of 65 p this is enlarged to a waist radius of about 500 p at the facet. At the same time, the beam is collimated at the facet. If the optics in this plane were to consist of a single lens, the distance from the modulator to the facet would be much too long to fit into the available space. The pre-polygon optics in the scan plane consist of three elements, to compress the modulator-to-facet distance to about 15 inches. In the cross-scan plane, the beam from the modulator is not affected by diffraction spreading, this occurs only in the scan plane. The beam waist from the modulator is then 50 p at the facet 15 inches away. For this task two optical elements are required.

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XEROX DISCLOSURE JOURNAL

OPTICAL SYSTEM FOR A RASTOR OUTPUT SCANNER U.S. C1.350/006.7 Harry P. Brueggemann
Vincent AuYoung
Patrick Maeda

Proposed Classification

Int. C1. G02b 26/08

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The optical system consists of the pre-polygon sections. The pre-polygon section changes the beam emerging from the modulator, to the conditions required at the polygon facet. It is also called the beam-conditioning optics. In the scan plane, the beam from the modulator has a waist radius of 65 p this is enlarged to a waist radius of about 500 p at the facet. At the same time, the beam is collimated at the facet. If the optics in this plane were to consist of a single lens, the distance from the modulator to the facet would be much too long to fit into the available space. The pre-polygon optics in the scan plane consist of three elements, to compress the modulator-to-facet distance to about 15 inches. In the cross-scan plane, the beam from the modulator is not affected by diffraction spreading, this occurs only in the scan plane. The beam waist from the modulator is then 50 p at the facet 15 inches away. For this task two optical elements are required.

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 2 MarcWApril 1990 73

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OPTICAL SYSTEM FOR A RASTOR OUTPUT SCANNER(Cont'd)

Since the magnification in the scan and cross-scan planes differ so greatly, it is to be expected that they require different optical designs. In order that these designs not interfere with each other, they must consist of cylinder lenses, with power only in the plane in which they perform their functio...