Patent ID: 7141813

Claim:
An exposure apparatus for exposing a substrate, moving in a scan direction, to light via a reticle, said apparatus comprising: a projection optical system configured to image a pattern of the reticle onto the substrate; a substrate stage configured to hold the substrate and to move; a detector configured to detect a surface position of the substrate, the substrate being held by said substrate stage and moving in the scan direction at a scan speed with said substrate stage, in a direction parallel to an optical axis of said projection optical system over a detection region preset on the substrate; and a controller configured to preset the detection region, to change a detection period over which said detector detects the surface position of the substrate based on a change in a preset value of the scan speed of said substrate stage so that said detector detects the surface position of the substrate over the preset detection region, and to control at least one of a position and a tilt of said substrate stage with respect to the direction parallel to the optical axis, based on the surface position detected by said detector.