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Scanner-based Technique to Adjust LED Printbar Uniformity

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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.
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Document Type: Research Article

Publication date: January 1, 2003

More about this publication?
  • For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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