Patent ID: 7372539
Filing Date: 2008-05-13
Classification: G03F

Abstract:
1. A method for correction of an image error, comprising the steps of: a) providing a microlithographic projection exposure apparatus comprising a projection lens being non-telecentric on an object side and having an extra-axial field region on an image plane, wherein the microlithographic projection exposure apparatus is configured to image a pattern contained in a reticle on a substrate of a light-sensitive layer while the reticle is traversed relative to the projection lens along a scan direction at a first relative velocity, b) establishing a substantially linear distortion with twofold symmetry in the extra-axial field region of the image plane of the projection lens, c) tilting the reticle for the correction of the distortion established in step b) about a tilt axis that is disposed at least approximately perpendicular to an optical axis of the projection lens and to the scan direction, and d) tilting the wafer for the correction of the distortion established in step b) about a further tilt axis that extends parallel to the tilt axis about which the reticle is tilted.