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New Technology for Improving Image Density Uniformity in the Electrophotographic Process

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This paper introduces a new method to reduce periodic density unevenness caused by eccentric rotation of the photoconductor drum and development roller in an electrophotographic printer. In a previous study, a method for controlling periodic density unevenness by using developing bias was proposed. The developing bias is controlled periodically to correct density unevenness. However, no control effects are obtained in low density images; rather, the control somewhat increases the density unevenness.

In this study, we developed a new method that reduces the periodic density unevenness through modulation of both charging bias and developing bias based on the rotational periods of the photoconductor drum and development roller. Each bias is periodically changed such that the changes in the developing field due to the eccentric rotation of the photoconductor drum and development roller are cancelled, thus suppressing the periodic density unevenness. Experiments we conducted confirmed that the new method improves periodic density uniformity better than the previous method. The new method guarantees density uniformity is obtained without the use of high-precision components.
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Document Type: Research Article

Publication date: 2013-01-01

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  • 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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