Patent ID: 6020950
Filing Date: 2000-02-01
Classification: G03F

Abstract:
A projection exposure apparatus comprising:a projection optical system for projecting a pattern formed on a mask onto an object, the pattern having a transparent portion which is substantially transparent to exposure light, and a phase shift portion for producing light whose phase is shifted from that of light transmitted through the transparent portion by substantially an odd number multiple of .pi.;a limiting member, located substantially at a Fourier transform plane having an optical Fourier transform relationship with a pattern surface of said mask in said projection optical system, for limiting a beam of light passing through the Fourier transform plane, which propagates near an optical axis of said projection optical system;a temperature control device for controlling a temperature of said limiting member; anda varying member for varying a distance between said object and an image plane of said projection optical system relating to the pattern of said mask, in a direction of the optical axis during an exposure operation with respect to one region on said object.