Patent ID: 6335787
Filing Date: 2002-01-01
Classification: G03F

Abstract:
An exposure apparatus that exposes a substrate with an illumination beam through a mask, said mask having a pattern, said exposure apparatus comprising:a projection optical system which forms an image of the pattern on the substrate, said projection optical system being disposed on a path through which the illumination beam passes between the mask and the substrate and comprising a first optical system which forms an intermediate image of the pattern and a second optical system which re-forms the intermediate image on the substrate; and a stage system which effects relative movement between the mask and the substrate with respect to the illumination beam, said stage system comprising a stage and an interferometer, said stage having a first reflecting surface extending in a first direction of the relative movement, said interferometer being adapted to apply three beams to the first reflecting surface and detecting information on a rotation about an axis extending in the first direction and information on a position with respect to a second direction intersecting the axis extending in the first direction.