Patent ID: 8520188
Filing Date: 2013-08-27
Classification: G03F

Abstract:
1. An illumination apparatus that illuminates an object by illumination light from a light source unit, the illumination apparatus comprising: a light transmission unit that includes a plurality of entrances that receive the illumination light from the light source unit and a common exit that emits at least part of the illumination light received by each entrance; a first relay optical system that optically relays a first partial illumination light, which is included in the illumination light from the light source unit, to form a first light beam having a first angle of incidence relative to a first optical axis of the first relay optical system and that sends the first light beam into a first entrance, which is included in the plurality of entrances; and a second relay optical system that optically relays a second partial illumination light, which is included in the illumination light from the light source unit, to form a second light beam having a second angle of incidence relative to a second optical axis of the second relay optical system and that sends the second light beam into a second entrance, which is included in the plurality of entrances, wherein the first angle of incidence differs from the second angle of incidence.