Method for improving registration of images on opposing sides of a printing medium
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United States of America Patent
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Oct 28, 2003
Grant Date -
N/A
app pub date -
May 15, 2001
filing date -
May 15, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is a method to generate alignable orthogonal images from non-orthogonal scans in a double-sided digital-offset-press arrangement by shifting the image data in the multi-channel modulators in a direction and rate that keeps the images orthogonal. The image data is shifted parallel to the cylinder axes and the amount of shift per cylinder rotation equals the distance the multi-channel modulators move relative to their respective cylinders per rotation of the relevant cylinder. This prevents 'parallelogram' type distortion in the images and maintains the orthogonality of the original images, thereby allowing the images on the opposing sides of the printing medium to be aligned. The shift can be done continuously or in discrete steps. The invention is also extendable to two-dimensional modulators such as deformable mirror devices (DMD) and liquid crystal light valves (LCLV).
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