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EXPOSURE COMPENSATION FOR POLYGON WOBBLE ERRORS

IP.com Disclosure Number: IPCOM000025980D
Original Publication Date: 1989-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 57K

Publishing Venue

Xerox Disclosure Journal

Abstract

It is proposed that polygon wobble errors and, to a more limited extent, facet-to-facet pyramidal errors be corrected by exposure control. Polygon wobble causes image data to have exposure and spatial errors on the photoreceptor. The exposure error can be corrected from knowledge of the scan spacing errors. The spatial errors may require that the digital image content and the printing process be taken into consideration to produce a visually correct final image.

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XEROX DISCLOSURE JOURNAL

It is proposed that polygon wobble errors and, to a more limited extent, facet- to-facet pyramidal errors be corrected by exposure control. Polygon wobble causes image data to have exposure and spatial errors on the photoreceptor. The exposure error can be corrected from knowledge of the scan spacing errors. The spatial errors may require that the digital image content and the printing process be taken into consideration to produce a visually correct final image.

The easiest type of exposure error to correct would be that caused by a polygon seat not perpendicular to the axis of rotation. If the number of facets is large, uniform exposure can be achieved by appropriately increasing laser power when scans are separated too much, and decreasing laser power when scans are too close. An ap ropriate question at this point involves whether or not

Facet-to-facet errors would be more difficult to correct and it is expected that exposure nonuniformity due to a single pyramidal facet error could be reduced by a factor of about two by exposure adjustment of nearby scans.

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EXPOSURE COMPENSATION FOR Proposed Classification POLYGON WOBBLE ERRORS U.S. C1.35518
Louis D. Mailloux Int. C1. G03g 15/28

Volume 14 Number 3 May/June I989 145

this will remove arti P acts when image content is considered.

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146 XEROX DISCLOSURE JOURNAL

Volume 14 Number 3 May/June 1989

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