Patent ID: 6089720
Filing Date: 2000-07-18
Classification: G03B

Abstract:
An illuminating optical apparatus comprising:a first light source for emitting light;an optical integrator including a first array with a plurality of optical cells and a second array with a plurality of optical cells; anda first reflector for reflecting light emitted from the first light source towards the optical integrator,wherein the first reflector includes at least one partial reflection surface, the partial reflection surface having a shape selected from the group consisting of a portion of a revolution paraboloid and a portion of a spheroid, the first light source being provided at a focal point of the first reflector, andwherein, along each radial direction perpendicular to an optical axis of the first reflector, a focal length of the at least one partial reflection surface is inversely proportional to a distance between a center of an opening of an optical cell of the second array and an edge of the opening thereof along a corresponding radial direction.