Patent ID: 8643826

Claim:
Method for the exposure of printing plates ( 5 ), in which light from a light source ( 2 ) is imaged on a two-dimensional light modulator ( 4 ) with a multiplicity of rows of light-modulating cells ( 8 ) and is modulated by the modulator, according to which the light modulator ( 4 ) is imaged via an imaging optical path ( 11 ) on light sensitive material ( 5 ), wherein the light sensitive material ( 5 ) is moved substantially perpendicularly to the direction of the rows of light-modulating cells ( 8 ) relative to the light modulator ( 4 ) at a relative speed and wherein the data patterns to be imaged on the light sensitive material ( 5 ), starting the first utilized row of the light modulator ( 4 ), are displayed sequentially in each row in each instance during a holding time (T, T′), and subsequently are displaced to the succeeding row of the light modulator ( 4 ) until data patterns are pushed out of the last utilized row, at a displacement rate through which the image ( 10 ) of a given data pattern is, on average, kept stationary relative to the light sensitive material ( 5 ), characterized in that the image ( 10 ) of the data pattern during the holding time (T, T′) is kept substantially stationary relative to the light sensitive material ( 5 ), wherein the relative movement between the light modulator ( 4 ) and the light sensitive material ( 5 ) is substantially compensated during the holding time, wherein the light modulator ( 4 ) is mechanically moved in order to move the image ( 10 ) of the data pattern, and wherein the mechanical movement of the light modulator is periodic, and is independent from and compensates for said perpendicular movement of the light sensitive material, and thereby keeps the image of the data pattern substantially stationary relative to the light sensitive material.