Patent ID: 6836315
Filing Date: 2004-12-28
Classification: G03F,H02K

Abstract:
A device manufacturing method, comprising:providing a substrate that is at least partially covered by a layer of radiation-sensitive material; providing a beam of radiation using a radiation system; using a patterning device to endow the beam with a pattern in its cross-section; projecting the patterned beam of radiation onto a target portion of the layer of radiation-sensitive material, positioning one of the substrate and the patterning device with a planar motor; the planar motor includes of a plurality of coil sets, each coil set producing at least one primary force in a given direction and at least one spurious torque, associated with the primary force, to a moving part of the planar motor; calculating the primary forces required to position the planar motor at a predetermined position; calculation the spurious torques associated with the calculated primary forces; calculating a correction for each of the calculated primary forces such that the corrections at least partially compensate for the sum of the calculated spurious torques on the moving part of the planar motor; and providing control signals to the coil sets to effect the calculated primary forces including the corrections.