Patent ID: 6512641
Filing Date: 2003-01-28
Classification: G02B,G03F

Abstract:
A catadioptric projection optical system that makes first and second planes optically conjugate, including a plurality of lens surfaces and at least two reflecting surfaces, the catadioptric projection optical system comprising:a catadioptric imaging optical subsystem; and a refractive imaging optical subsystem; wherein a position that is optically conjugate to the first and second planes is formed in an optical path between the catadioptric imaging optical subsystem and the refractive imaging optical subsystem; the catadioptric imaging optical subsystem is arranged in the optical path between the first plane and the conjugate position; the refractive imaging optical subsystem is arranged in an optical path between the second plane and the conjugate position; and the catadioptric imaging optical subsystem includes a concave reflecting surface, an optical path between the first plane and the concave reflecting surface, and an optical path between the concave reflecting surface and the refractive imaging optical subsystem; at least one reflecting surface among the at least two reflecting surfaces is arranged in the optical path between the concave reflecting surface and the refractive imaging optical subsystem; at least one lens surface among the plurality of lens surfaces has an aspherical shape; the refractive imaging optical subsystem includes a plurality of lens elements; and the plurality of lens elements in the refractive imaging optical subsystem are positioned so that a light beam including a maximum numerical aperture of 0.75 can be guided to the second plane.