Patent ID: 6122036
Filing Date: 2000-09-19
Classification: G03B,G03F

Abstract:
A projection exposure apparatus which exposes a substrate with a projected image of a mask through a projection optical system, comprising:a mask table which is arranged at an object side of said projection optical system to hold said mask;a wafer table which is arranged at an image side of said projection optical system to hold said substrate, which is able to be tilted, and which is movable in a direction of an optical axis of said projection optical system, said wafer table being provided with a reflection surface thereon;an interferometer having a measurement axis with respect to said reflection surface to detect a first displacement amount of said substrate, in a predetermined direction perpendicular to said direction of the optical axis;a detection device independent from said interferometer, which detects a second displacement amount of said substrate, different from said first displacement amount, in said predetermined direction, said displacement amount being generated due to the tilt of said wafer table; andan adjusting device connected to one of said mask table and said wafer table to adjust relative positional relationship in said predetermined direction between an image plane of said projection optical system and said substrate, based on said second displacement amount.