Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
May 20, 2008
Patent Application Number
11188300
Date Filed
July 25, 2005
Patent Primary Examiner
Patent abstract
In a printing system, a method is used for adjusting currents to LEDs in an LED printbar to achieve uniformity of the print. The line test pattern and halftone strips test pattern are printed. The test patterns are scanned. An LED line metric of each LED test pattern line and reflectance uniformity of each halftone test strip are measured. A line uniformity difference profile and a set of halftone strips uniformity difference profiles are concurrently calculated. A current value supplied to each LED associated with the test patterns is adjusted to simultaneously optimize the uniformity in the lines test pattern and the halftone strips test pattern.
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