Patent ID: 7826068

Claim:
A method for correcting the measured values of positions of structures on a substrate, wherein the correction results from the bending of a substrate, comprising the following steps: a) determining at least one geometric parameter of the substrate with a measuring lens arranged moveable in the Z coordinate direction in combination with a detector of a camera; b) determining at least one physical parameter of the substrate and at least one environmental parameter; c) determining the geometry and a plane defined by support points and obtaining a position of each support point in relation to a coordinate system of the substrate, wherein the determination is carried with the measuring lens moveable in the Z coordinate direction in combination with the detector of the camera; d) individually calculating with a computer a degree of bending for each substrate on the basis of the determined geometric parameters, the physical parameters and the positions of the support points; and e) correcting the measured position data of the structures on the substrate with the aid of the individually calculated degree of bending.