Patent ID: 6327022
Filing Date: 2001-12-04
Classification: G03F

Abstract:
A scanning type exposure apparatus for exposing a substrate with a pattern formed on a mask by scanning the mask across an illumination light beam while synchronously moving the mask and the substrate with respect to the illumination light beam, the scanning type exposure apparatus comprising:a projection system which is arranged in a path of the illumination light beam and projects an image on one side of the projection system;a mask stage, at least one part of which is disposed on the other side of the projection system, and which is movable in a plane while carrying a plurality of masks and which has a first reflective surface formed on a side of the mask stage extending in a scanning direction;a position-detecting system which detects a position of the mask stage by irradiating the first reflective surface with a light beam;a memory which stores previously measured surface curvature data on the first reflective surface in relation to positions of the plurality of masks to be carried; anda control unit which is associated with the position-detecting system and the memory and controls the position of the mask stage on the basis of the surface curvature data on the first reflective surface stored in the memory and the position detected by the position-detecting system.