Patent ID: 7901082
Filing Date: 2011-03-08
Classification: G02B,G03B,H04N

Abstract:
1. An illumination optical device comprising: 2n (n is 2 or more) light sources; 2n first collective optical systems composed of ellipsoidal mirrors that are arranged so as to focus light beams emitted from the respective light sources; n first light combiner optical systems that are composed of prisms, each having an isosceles triangular prism shape in cross section, and are arranged so as to synthesize exiting light beams from respective corresponding two of the first collective optical systems; second collective optical systems arranged so as to focus exiting light beams from the respective first light combiner optical systems; a n/2 second light combiner optical system composed of a prism having an isosceles triangular prism shape in cross section and arranged so as to synthesize exiting light beams from respective corresponding two of the second collective optical systems; and a third collective optical system composed of a plurality of lenses and a plurality of lens arrays and arranged so as to allow exiting light beam from the second light combiner optical system to be incident thereon, wherein the 2n first collective optical systems each have an optical axis substantially parallel to one another.