Patent ID: 6677601
Filing Date: 2004-01-13
Classification: G03F

Abstract:
An exposure apparatus which exposes a substrate with a pattern formed on a mask, comprising:a projection optical system which projects the pattern formed on the mask onto the substrate; and a position detecting system which detects a mark formed on the substrate not through the projection optical system, wherein the position detecting system includes: a beam illuminating system which is arranged at a predetermined side with respect to said substrate, and which irradiates an illumination beam perpendicularly onto said mark; a first detecting system which is arranged at the same side as said predetermined side with respect to said substrate, the first detecting system including a first optical element which causes Â±nth-order (n is a natural number) diffracted beams generated from said mark irradiated with said illumination beam to respectively incline at a predetermined angle on a first reference grating and a first photoelectric element which detects a beam from the first reference grating irradiated with the Â±nth-order diffracted beams; and a second detecting system which is arranged at the same side as said predetermined side with respect to the substrate, the second detecting system including a second optical element which causes Â±mth-order (m is a natural number other than n) diffracted beams generated from said mark irradiated with said illumination beam to respectively incline at a predetermined angle on a second reference grating and a second photoelectric element which detects a beam from the second reference grating irradiated with the Â±nth-order diffracted beams.