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US Patent 7564475 Compensation of high frequency banding in printing systems

Patent 7564475 was granted and assigned to Xerox on July, 2009 by the United States Patent and Trademark Office.

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Patent
Patent

Patent attributes

Current Assignee
Xerox
Xerox
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7564475
Date of Patent
July 21, 2009
Patent Application Number
12057706
Date Filed
March 28, 2008
Patent Citations Received
‌
US Patent 11914319 Printer providing in-track error correction incorporating anti-aliasing at cross-track positions
3
Patent Primary Examiner
‌
Hai C Pham
Patent abstract

A test pattern is written using multiple image beams in a non image zone at set time intervals. The test pattern is sensed and a profile of each beam is determined from the multiple image beams. A minimum reflectance of the profile is determined from the test pattern of each beam thereby providing an exposure of each respective beam. A centroid of a profile is determined from the test pattern of each beam thereby providing a position of each respective beam. At least one of the following is then determined: frequency, amplitude and phase of banding, which is inherent in a printing device, based on the sensed test pattern. A plurality of groups of image beams intensity changes is combined wherein each group is separated by a set displacement. A banding profile is determined from the group beam intensities. At least one banding compensation metric is determined based at least on one of the determined frequency, amplitude and phase of banding. Beam intensity changes are adjusted based on the determined banding compensation metric to compensate the banding inherent in the printing device.

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