Automatic LED printbar uniformity and adjustment
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United States of America Patent
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-
Sep 16, 1997
Grant Date -
N/A
app pub date -
Aug 11, 1995
filing date -
Mar 4, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Uniformity light output of an LED printbar is achieved by a technique which senses the operational on time of each LED. When the on time difference between the LED with the longest on time and the LED with the shortest on time exceeds a predetermined value, the outputs of at least some LEDs comprising the printbar are compensated for to normalize their light output. This normalization is achieved via a drive circuit which drives each LED based upon correction data, and by determining an update of the correction data based upon the difference between the on time of individual LEDs. The correction data is determined when the difference between the on time of the LED with the longest on time and the on time of the LED with the shortest on time exceeds a predetermined maximum difference.
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Cited Art Landscape
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