Patent ID: 9632423
Date: 2017-04-25
CPC Classifications: G02B,G03F

Claim:
1. An illumination device that illuminates an illumination surface, comprising: a plurality of light source units, each including a light source, a mirror that reflects light from the light source, and one or more light blocking members that block the light that is reflected by the mirror and travels toward the illumination surface; and an illumination optical system that forms a light intensity distribution of superposed light, in which the light from each of the light source units is superposed, in a pupil plane and illuminates the illumination surface with the superposed light, wherein, in the light intensity distribution in the pupil plane of the illumination optical system, positions of shadows of all of the light blocking members included in one of the light source units are separated from positions of shadows of all of the light blocking members included in at least one of the remaining light source units.