Patent ID: 6504567
Filing Date: 2003-01-07
Classification: B41J,H04N

Abstract:
A process for plotting of a raster image on a light-sensitive record carrier comprising:converting a computer-stored raster image comprising raster points into controllable raster point-related light beams via a light modulator, such that picture elements corresponding to the raster points are plotted on the record carrier; matrix-like dividing of the computer raster image into imaginary computer raster image sub-areas; matrix-like dividing of the record carrier raster image into imaginary record carrier raster image sub-areas, wherein the sub-areas of the computer and record carrier raster image are associated with one another; matrix-like dividing of the imaginary computer raster image sub-areas into n imaginary raster point positions, wherein n is an integer number; matrix-like dividing of the sub-areas of the record carrier raster image into n imaginary picture element positions, wherein n is an integer number; assigning the picture element positions to the raster image positions; simultaneously plotting the picture elements corresponding to the raster points of a sub-area of a record carrier raster image; successively plotting the sub-areas of the record carrier raster image; continuously moving a light modulator relative to the record carrier to capture an entire surface of the record carrier according to the sub-areas of the record carrier raster image; projecting the light modulator for each sub-area of the record carrier raster image with light; during relative displacement between the light modulator and the record carrier, compensating an excursion of the light beams emanating from the light modulator and impacting a sub-area of the record carrier raster image during a time interval T with a displaceable lens disposed between the light modulator and the record carrier, wherein the time interval T is above a value W1, which relates to a maximum permissible displacement path for the relative movement for plotting resolution without use of the displacable lens, is below a value W2, which relates to a time interval that begins when a first half of the light modulator surface projects into a specified sub-area of the record carrier raster image and that ends when only a second half of the light modulator surface projects into the specified sub-area of the record carrier raster image, and is reduced by a reverse period for the displacable lens; and displacing the displaceable lens, after recording the picture elements in a record carrier raster image sub-area, in a direction opposite to the compensation direction into a starting position for plotting of the next sub-area of the record carrier raster image.