Patent ID: 7307692
Filing Date: 2007-12-11
Classification: G03F

Abstract:
1. An exposure apparatus comprising: an exposure optical system which exposes a substrate to a pattern; a substrate processing system which performs a predetermined process for the substrate at a position apart from said exposure optical system; a substrate stage which moves along a plane perpendicular to a direction of an optical axis of said exposure optical system, said substrate stage comprising a mirror having a reflecting surface perpendicular to the direction of the optical axis; an interferometer system which emits measurement light to measure a position of said substrate stage in the direction of the optical axis; and a fixed mirror which guides the measurement light from said interferometer toward said mirror, wherein said mirror is arranged along a first direction perpendicular to the direction of the optical axis, and said fixed mirror is arranged along a second direction perpendicular to both the first direction and the direction of the optical axis, and said interferometer system is configured to move along the second direction and to continuously measure a position of said substrate stage in the direction of the optical axis in a moving range of said substrate stage while said substrate stage moves from a position below said substrate processing system to a position below said exposure optical system.