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Optimization of the Image Profile Transform in High Resolution Electrophotography

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The resolution of digital electrophotographic printers and copying machines has been steadily increasing and products now exist with 1200 dpi specifications. However, due to the technological difficulties involved in making narrow laser beams, the actual spot size in most applications is much larger than the resolution pitch. For this reason, realizing 1200 dpi image quality is in fact problematic.

For the purpose of constructing a method to resolve the above stated problems, we modeled image profile transforming properties, including the energy distribution of laser beam exposure, the latent image profile, and the profile of developed toner. The resulting image profile is related to such parameters as the exposure condition, PIDC (photo-induced discharge characteristics), which is the potential of the photoreceptor as a function of the exposure energy, and the development curve. Next, we defined the merit function of the target image profile. Employing this function, it was possible to choose the parameters in such a way to produce satisfactory results by using a nonlinear programming method. Finally, we performed experiments using 1200dpi resolution with the parameter values obtained through the optimization process and found that the developed image profile was satisfactorily sharp.

Document Type: Research Article

Publication date: January 1, 2000

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.
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