Patent ID: 6317196
Filing Date: 2001-11-13
Classification: G03F

Abstract:
A projection exposure apparatus for projecting a mask pattern on a mask onto a substrate and exposing the projected pattern on the substrate, comprising:an illumination optical system for illuminating a portion of the mask pattern on the mask with an exposing radiation flux of a predetermined shape;a fixed support;a projection optical system fixed to the fixed support for projecting the image of the illuminated portion of the mask pattern onto the substrate;a carriage for holding the mask and the substrate, the carriage being movable in a predetermined direction through a predetermined stroke with respect to the projection optical system to successively expose the substrate with the image of the mask pattern formed by the exposing radiation flux;a first long mirror elongated in the predetermined direction and fixed to the fixed support, the length of the long mirror being at least equal to the stroke of the carriage movement in the predetermined direction; anda measurement system for measuring the position of the mask and the position of the substrate with respect to the long mirror to determine the position of the mask relative to the substrate in a direction perpendicular to the predetermined direction.