Patent ID: 6798497
Filing Date: 2004-09-28
Classification: G03F

Abstract:
A lithographic projection apparatus configured and arranged to image a pattern onto a substrate, said apparatus comprising:a first object table configured and arranged to hold a patterning structure capable of patterning the beam of radiation according to a desired pattern; a second object table configured and arranged to hold a substrate; and a projection system configured and arranged to image the patterned beam onto a target portion of the substrate; a positioning structure configured and arranged to generate a force so as to move one of the first and second object tables with respect to the projection system during an imaging operation; and processing circuitry configured and arranged to select, from among a plurality of predetermined compensation force values, a compensation force value that corresponds to a value of a signal representing a position of said object table, wherein said processing circuitry is further configured and arranged to generate a force adjustment signal based on said compensation force value, and wherein said positioning structure is further configured and arranged to generate the force according to the force adjustment signal.