Patent ID: 7126669
Filing Date: 2006-10-24
Classification: G03F

Abstract:
1. A method for aligning a substrate on a substrate table of a first lithographic apparatus; the substrate comprising a plurality of alignment marks that have been defined by a second lithographic apparatus and are arranged to define a substrate grid to form a coordinate system on the substrate, said coordinate system including a first direction and a second direction, the second direction being substantially perpendicular to the first direction, the method comprising: measuring a location and an orientation of the plurality of alignment marks to obtain alignment mark data; determining the substrate grid of the substrate from the alignment mark data by using a first substrate grid model with a first set of parameters; determining the substrate grid of the substrate from the alignment mark data by using a second substrate grid model with a second set of parameters, the second set of parameters comprising an ortho-scaling parameter in addition to the first set of parameters, and correcting machine-to-machine differences between the first lithographic apparatus and the second lithographic apparatus with automated process control data based on the ortho-scaling parameter.