An illumination device for supplying a beam of linearly polarized light having a non-rotationally symmetrical cross-section at the location of an object to be illuminated is described, which device comprises a light source, a reflector, an optical integrator (54, 82) for forming said beam cross-section...http://www.google.es/patents/US5601351?utm_source=gb-gplus-sharePatente US5601351 - High-efficiency illumination device and image projection apparatus comprising such a device
High-efficiency illumination device and image projection apparatus ...
