Patent ID: 7301605

Claim:
A catadioptric optical system forming a reduced image of a first surface onto a second surface comprising: a first imaging optical subsystem which is arranged in an optical path between the first surface and the second surface and includes a dioptric imaging optical system to form a first intermediate image of the first surface; a first folding mirror which is arranged in the vicinity of a position of forming the first intermediate image to deflect a beam prior to or after the position where the first intermediate image is formed; a second imaging optical subsystem which is arranged in an optical path between the first folding mirror and the second surface and which forms a second intermediate image with a magnification factor nearly equal to the first intermediate image in the vicinity of a position of forming the first intermediate image based on the beam from the first intermediate image, the second imaging optical subsystem includes a concave reflecting mirror and at least one negative lens; a second folding mirror which is arranged in the vicinity of a position of forming the first intermediate image to deflect a beam prior to or after the position where the second intermediate image is formed; and a third imaging optical subsystem which is arranged in an optical path between the second imaging optical subsystem and the second surface and includes a dioptric imaging optical system to form the reduced image onto the second surface based on the beam from the second intermediate image, wherein the catadioptric optical system is a telecentric optical system on both sides of the first surface and the second surface.