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US 6,637,329 B1Granted
Method for improving registration of images on opposing sides of a printing medium
AssigneeCreo Products Inc.
InventorJames Madeley
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AssigneeCreo Products Inc.
InventorJames Madeley
Estimating the term…
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).
A method for the mutual registration of images on opposing sides of a printing medium printed on a double-sided printing press, said method comprising the orthogonalization of said images wherein said orthogonalization of said images on both of said opposing sides of said printing medium comprises:
A method for the mutual registration of a first image to be printed with a double-sided printing press on a first side of a printing medium with a second image to be printed on a second side of the printing medium, the method comprising:
Dependencies are inferred from the claim text.