Optical system for use in image projector, has optical unit with surface having facets for redirecting part of illumination beam towards imager to illuminate imager for adapting shape of beam to suit imager

摘要

The system has a source of illumination to produce an illuminating beam (35) focused on a focusing beam. A lens is provided for collimating the illumination beam originated from the focusing beam. An optical unit (1101) has a surface with facets for redirecting part of the illumination beam towards the imager to illuminate the imager (34) for adapting a shape of the beam to suit the imager.