Patent ID: 6104471
Filing Date: 2000-08-15
Classification: G03F

Abstract:
An exposure apparatus for transferring, successively in a stitching manner, a pattern formed on a mask through a projection optical system onto a plurality of areas existing continuously on a substrate, comprising:a stage for placing the substrate thereon and movable in two orthogonal axial directions;a mark detector for detecting positions of alignment marks previously formed in the two orthogonal axial directions on the substrate;a magnification-correcting unit for correcting a magnification of the projection optical system;a controller, which is connected to the mark detector, for calculating stretching degrees of the substrate in the two orthogonal axial directions respectively on the basis of information on the positions of the alignment marks detected by the detector and information on designed positions of the alignment marks, and for weighting each of the calculated stretching degrees in the two orthogonal axial directions by using different predetermined coefficients in the two orthogonal axial directions on the basis of the pattern respectively, and for controlling the magnification-correcting unit to adjust the magnification of the projection optical system depending on the weighted stretching degrees.