Patent ID: 8348438
Filing Date: 2013-01-08
Classification: G02B,G03B,H04N

Abstract:
1. Illumination optics, comprising: a first fly-eye lens; and a second fly-eye lens where emission light coming out of the first fly-eye lens enters, wherein at least one of lens elements configuring the second fly-eye lens provides irradiation to its irradiation area that is smaller than an illumination area that is irradiated with light from all the lens elements of the second fly-eye lens, wherein the irradiation area of the at least one of lens elements overlaps with an irradiation area of another one of the lens elements, wherein a plurality of lens elements arranged in a vicinity of a center of the second fly-eye lens provides irradiation light to its irradiation area that occupies a same region near a center of the illumination area, and wherein a thickness of the lens elements of the second fly-eye lens continuously decreases from an edge to a center of the second fly-eye lens.