Patent ID: 7584072
Filing Date: 2009-09-01
Classification: G01B

Abstract:
1. A method for determining correction values for positions of structures on a substrate, wherein the correction values are determined on the basis of a degree of bending of the substrate in a substrate holder relative to a coordinate system of a coordinate measuring machine, comprising the steps of: calculating the degree of bending of the substrate for each type of substrate, wherein the correction values for the degree of bending of the substrate are known relative to a reference point, and wherein the substrate is supported on three support points in the substrate support; determining the position of two reference marks on the substrate holder with respect to the reference point for each substrate holder used with coordinate measuring machine; automatically determining a position of the at least two reference marks on the substrate holder relative to the coordinates system of the coordinate measuring machine for the substrate holder currently being used in the coordinate measuring machine, wherein the position of the reference point relative to the coordinate system of the coordinate measuring machine is calculated herefrom; and determining on the basis of the measuring result for the position of the reference point, the allocation of correction values for calculation of the degree of bending of the substrate currently in the substrate holder relative to the coordinate system of the coordinate measuring machine, at each point of the substrate at which measurement of the position of a structure on the substrate was carried out.