Patent ID: RE39024

Claim:
A catadioptric projection optical system for projecting an image of a pattern of a first surface onto a second surface, said catadioptric projection optical system comprising: a first image-forming optical system for forming an intermediate image of the pattern of said first surface, said first image-forming optical system including: a first group with a positive refractive power, comprising a refractive lens component, for converging a light beam from the pattern of said first surface; a second group with a positive refractive power, comprising a concave, reflective mirror for reflecting a light beam from said first group, for forming said intermediate image of the pattern of said first surface; and a beam splitting optical system for changing a traveling direction of one of a light beam from said first group and a reflected light beam from said concave, reflective mirror; and a second image-forming optical system for forming an image of said intermediate image on said second surface.