Patent ID: 6830339
Filing Date: 2004-12-14
Classification: G02B,H04N

Abstract:
An optical polarization recuperation device for producing a substantially polarized light beam from an unpolarized light beam comprising first and second polarizations, the device comprising:an optical circuit having an entrance area for receiving incoming light rays, and an exit area for allowing light rays to exit the optical circuit, the entrance area having an inner side with an aperture and the exit area having an outer side away from said entrance area, a reflective polarizer means adjacent the outer side of the exit area of the optical circuit, for directing light rays having the first polarization into a first light path and for directing light rays which have the second polarization into a second light path in the optical circuit, a mirror at the inner side of the entrance area of the optical circuit, with a means for reflecting those light rays following the second light path which fall onto it, and a quarter wave or an odd multiple of quarter wave retarder means through which at least a part of the light in the optical circuit and which is to be emitted from the optical circuit passes, wherein light following the first and the second light path goes through the same part of the optical circuit.