Patent ID: 7446856
Filing Date: 2008-11-04
Classification: G02B,G03F

Abstract:
1. An illumination system for illuminating a region of a surface with illumination light emitted from a light source, the system comprising: an incidence-side reflection-type fly-eye optical system comprising multiple first reflective elements arranged in rows; an emission-side reflection-type fly-eye optical system comprising multiple second reflective elements arranged in rows such that each second reflective element corresponds to and receives illumination light from a respective first reflective element of the incidence-side reflection-type fly-eye optical system; and a condensing optical system comprising two reflective mirrors that guide the illumination light, reflected by the emission-side reflection-type fly-eye optical system, to the region of the surface, wherein at least one of the reflective mirrors has a center of curvature that is optically eccentric with respect to a normal to the surface at the center of the illuminated region.