Browse Prior Art Database

DUAL LENS CORRECTION AND STABILIZING OPTICS FOR SCANNER ARCHITECTURE

IP.com Disclosure Number: IPCOM000026600D
Original Publication Date: 1992-Dec-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 105K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a dual lens apparatus for correcting and stabilizing laser scanner beam placement in an electrophotographic printer. Instability is introduced by long beam projection distances, shifts from thermal stresses, mechanical vibration and machine distortions. Laser scan systems are particularly sensitive to fluctuations in beam scan placement in the process direction, vibration, polygon wobble and poor motion quality which causes "anding" or "strobing".

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

DUAL LENS CORRECTION AND STABILIZING OPTICS FOR U.S. C1.346/160 SCANNER ARCHITECTURE
Frank C. Genovese

Proposed Classification

Int. C1. Gold 15/00

t

G>

FIG. IA

XEROX DISCLOSURE JOURNAL Vol. 17 No 6 November/December 1992 431

FIG. IB

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DUAL LENS CORRECTION AND STABILIZING OPTICS FOR SCANNER ARCHITECTURE (Cont'd)

Disclosed is a dual lens apparatus for correcting and stabilizing laser scanner beam placement in an electrophotographic printer. Instability is introduced by long beam projection distances, shifts from thermal stresses, mechanical vibration and machine distortions. Laser scan systems are particularly sensitive to fluctuations in beam scan placement in the process direction, vibration, polygon wobble and poor motion quality which causes "anding" or "strobing".

Optical elements 15, shown in Figures 1A and 1B of scanning system 2, correct and stabilize laser light emitting from laser source 10 by compensating for instabilities first in the horizontal and then vertical direction. Laser source 10 produces collimated laser beam 12 which is reflected from the facets of rotating polygon 14. Each facet of polygon 14 in turn deflects laser beam 12 to create an illuminated beam spot 16 on the pre-charged surface of photoreceptor 18. The periodic scanning of beam spot 16 across the moving photoreceptor 18 creates an array of scan lines 20. Horizontal and vertical scanning instabilities are corrected by lenses 4 and 5 respectively. Positional shifts...