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Proceedings Paper

Pixel placement errors due to misalignment of internal drum writing engines
Author(s): Edward L. Kelley
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Paper Abstract

Image geometric accuracy in large format color separation quality writing engines or output scanners requires careful control of the opto—mechanical alignment of engine subsystems. Internal drum scanners are particularly sensitive to misalignment of the spinner, drum and spinner linear transport axes relative to each other. Misalignment of these axes leads to significant errors in cross—scan and in-scan pixel placement in the written image. A method is presented for determining alignment sensitivity of internal drum output scanners by tracing only the principal ray through the system and systematically manipulating engine component axes with the ray trace model. The model traces deviated rays through the misaligned system providing data on placement of pixels in the written image. This method provides an efficient means of determining system sensitivity to various alignment conditions and allows system tolerances to be apportioned appropriately.

Paper Details

Date Published: 1 May 1992
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Proc. SPIE 1670, Color Hard Copy and Graphic Arts, (1 May 1992); doi: 10.1117/12.2322256
Show Author Affiliations
Edward L. Kelley, Miles Inc. (United States)


Published in SPIE Proceedings Vol. 1670:
Color Hard Copy and Graphic Arts

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