Browse Prior Art Database

DOUBLE REFLECTING POLYGON SCANNER

IP.com Disclosure Number: IPCOM000026147D
Original Publication Date: 1990-Aug-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 4 page(s) / 97K

Publishing Venue

Xerox Disclosure Journal

Abstract

Figure 1 shows a section of a printing system which uses a rotating polygon 10, wherein a fixed external mirror 12 is used to redirect a laser beam 14 back to the facet 16 of the rotating polygon. Since the reflected beam has twice the mechanical scan of the facet, the second beam has twice the scan angle of a single reflected beam.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

DOUBLE REFLECTING POLYGON Proposed Classification SCANNER U.S. C1.350/006.7 Michael Harrigan Int. C1. G02b 26/08

10 14 16 ))gi2

FIGlA .

14

FIG 1B

XEROX DISCLOSURE JOURNAL - Voi. 15, No. 4 July/August 1990 219

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DOUBLE REFLECTING POLYGON SCANNER(Cont'd)

FIG 2A

FIG 2B

220 XEROX DISCLOSURE JOURNAL - Vol. 15, No. 4 July/August 1990

[This page contains 1 picture or other non-text object]

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DOUBLE REFLECTING POLYGON SCANNER(Cont'd)

Figure 1 shows a section of a printing system which uses a rotating polygon 10, wherein a fixed external mirror 12 is used to redirect a laser beam 14 back to the facet 16 of the rotating polygon. Since the reflected beam has twice the mechanical scan of the facet, the second beam has twice the scan angle of a single reflected beam.

Figures 1A and 1B show two views of a 20 facet polygon, Figure 1A being the top view and Figure 1B being side view. Figure 1B also shows how the laser beam 14 clears the external mirror 12 by being pointed at the facet 16 at an angle.

The above mentioned technique can be used to double the single reflection polygon speed if the same output scan angle is used because the twice reflected beam is moving at twice the speed of the single reflected beam.

To use a polygon at double the rate over the same scan angle, two conditions must be met. First, if the same diameter input laser beam is used, the facet size cannot de...