Importance

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Abstract

A system for illumination of a light sensitive medium includes means for patterning each of a plurality of beams using an illumination unit having at least one illumination head, the illumination head including at least two arrays of individually controllable light valves, means for projecting the patterned beams onto the light sensitive medium, means for displacing the light sensitive medium relative to the patterned beams, such that the patterned beams are scanned across the light sensitive medium in a scanning direction, means for directing the patterned beams towards the light sensitive medium by means of lenses arranged such that each lens directs a respective part of a respective patterned beam towards a respective target area on the light sensitive medium, means for spacing the arrays apart in the scanning direction, such that each of the arrays scans the patterned beams across the areas of the light sensitive medium as the light sensitive medium and the at least one illumination head are displaced relative to each other, the respective target areas scanned by the patterned beams are contiguous, means for individually controlling the individually controlled light valves of the illumination unit in dependency of the relative movement between the illumination head and the light sensitive medium, and a plurality of light emitters in the form of light guides arranged to illuminate the light sensitive medium via a light valve arrangement, the light valve arrangement including a plurality of electrically controlled light valves, wherein at least two of the light emitters are arranged to illuminate a plurality of light valves each.

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First Claim