Patent ID: 7330202
Filing Date: 2008-02-12
Classification: G03F,G06K,H04N

Abstract:
1. A method for correcting a skewed recording of a printing original on a recording material in an exposer, which comprises: clamping the recording material onto an exposure drum; generating, with an exposure head, N laser beams projected onto the recording material as a linear array of exposure points oriented in a feed direction; continuously moving the exposure head along the exposure drum in an axial feed direction as the exposure drum rotates and recording the printing original along a helix wound around the exposure drum; modulating the laser beams with image data taken from a stored image point matrix organized in image lines; recording the printing original with an exposure resolution of A image points per unit length; forming recording lines from image data taken from the image point matrix along an angled read path; assembling the recording lines from line sections taken from adjacent image lines; determining a number of image points K per line section in accordance with the equation: where U is the circumference of the exposure drum; and modulating the laser beams with the image data of the recording lines.