PRODUCING A LITHOGRAPHIC PRINTING PLATE BY SEQUENTIALLY EXPOSING A THERMO-SENSITIVE IMAGING ELEMENT BY A SET OF RADIATION BEAMS

摘要

PROBLEM TO BE SOLVED: To form a lithographic printing plate by continuous exposure of a thermo-sensitive imaging element by a set of radiation beams. SOLUTION: At any given moment (ta+Δt) during exposure, at least two or more radiation beams (bi, bj) of an emitting beam group impinge on different microdots (ma, ma+Δm) of a scanline (1a) on an imaging element, so that by completion of the exposure step, each effective microdot of the scanline has been impinged by all effective radiation beams of the set.