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Volume: 19 | Article ID: art00020_2
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Scanner-based Technique to Adjust LED Printbar Uniformity
Howard Mizes
Daniel Viassolo
  DOI :  10.2352/ISSN.2169-4451.2003.19.1.art00020_2  Published Online :  January 2003
Abstract

Electrophotographic printers using light emitting diode (LED) imagers may print images with streaks due to nonuniformity in the light output intensity and spot shape. Typically, each LED intensity is measured and the current adjusted to maintain uniform light output. However, the spot profile from emitter to emitter is different because of the imaging optics and emitter structure variations. The response of the print engine to spot structure can cause a printer to have streaks even though the intensity profile is uniform. We describe a technique that monitors the print uniformity to adjust the LED elements. The test pattern consists of an arrangement of single pixel wide lines arranged in a way that minimizes the sensitivity to printer and measurement noise. Control theory methodology is used to adjust the LED exposures to achieve a uniform profile of line widths and thus full print uniformity. This approach can be used to compensate for other system sources of print nonuniformity.

Journal Title : NIP & Digital Fabrication Conference
Publisher Name : Society of Imaging Science and Technology
Publisher Location : 7003 Kilworth Lane, Springfield, VA 22151, USA
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 DOI 10.2352/ISSN.2169-4451.2003.19.1.art00020_2
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Howard Mizes, Daniel Viassolo, "Scanner-based Technique to Adjust LED Printbar Uniformity"  in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP19),  2003,  pp 532 - 536,  https://doi.org/10.2352/ISSN.2169-4451.2003.19.1.art00020_2

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Copyright © Society for Imaging Science and Technology 2003
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NIP & Digital Fabrication Conference
nip digi fabric conf
2169-4451
Society of Imaging Science and Technology
7003 Kilworth Lane, Springfield, VA 22151, USA
2169-4451(20030101)2003:2L.532;1-
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Articles
Scanner-based Technique to Adjust LED Printbar Uniformity
MizesHoward
ViassoloDaniel
01012003
2003
2
532
536
2003
Electrophotographic printers using light emitting diode (LED) imagers may print images with streaks due to nonuniformity in the light output intensity and spot shape. Typically, each LED intensity is measured and the current adjusted to maintain uniform light output. However, the spot profile from emitter to emitter is different because of the imaging optics and emitter structure variations. The response of the print engine to spot structure can cause a printer to have streaks even though the intensity profile is uniform. We describe a technique that monitors the print uniformity to adjust the LED elements. The test pattern consists of an arrangement of single pixel wide lines arranged in a way that minimizes the sensitivity to printer and measurement noise. Control theory methodology is used to adjust the LED exposures to achieve a uniform profile of line widths and thus full print uniformity. This approach can be used to compensate for other system sources of print nonuniformity.