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Simulating resolution of gradient index array using illumination analysis

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An LED print head has a gradient index array. In order to improve resolving power of the array, resolution of the arrays were analyzed by using the illumination analysis. The array has plural gradient index rods, which have a refractive index distribution in the radial direction of the rods. An erected image is exposed at same magnification of an object by the array. In the illumination analysis, a large amount of random rays was radiated from light sources to images in a simulation models. The current results showed the resolution of the array depend on a coefficient of refractive index distribution (gradient coefficient) and a rod radius. A small gradient coefficient improved the resolution of the array. A reduction in the radius improved the resolution of the array. The small gradient coefficient and the reduction in the radius causes small aperture angle of the rod. The rod has a small aperture angle don't pass through rays which have a large comatic aberration and causes a large field curvature. If the rod has a stable refractive index distribution in manufacturing but poor resolution, it seems to be effective that after forming the refractive index distribution, the rod is trimmed and the radius is reduced to improve the resolution.

Document Type: Research Article

Publication date: January 1, 2008

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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