Multi-layered collimator

摘要

The invention relates to a collimator ( 1 ) for use in an optical device, such as a display device, an illumination device or an optical touch sensitive device. The collimator ( 1 ) according to the invention comprises a multi-layered sheet of preferably at least five alternating light transmitting ( 10 ) and light impervious layers ( 11 ). A collimation angle of a few degrees is obtainable using a collimator ( 1 ) according to the invention. The invention also relates to methods for producing such a collimator ( 1 ) by co-extruding or injection molding.