Patent ID: 6937318

Claim:
A lithographic projection apparatus, comprising: a substrate table configured to hold a first substrate; a second substrate table configured to hold a second substrate; a first station at which measurement of the first and second substrates may be performed; a second station at which the first and second substrates may be exposed; a displacement measuring system configured to measure displacements of the first and second substrate tables in the first and second stations; a planar motor configured to independently transfer the first and second substrate tables between the first and the second station; a radiation system, associated with the second station, configured to provide a beam of radiation; a support configured to support a patterning device, the patterning device configured to pattern the beam according to a desired pattern; and a projection system configured to project the patterning beam onto a target portion of the first and second substrates when the first and second substrates are at the second station, respectively, wherein the displacement measuring system is configured to continuously measure displacements of the first and second substrate tables in at least two directions during transfer between the first and second stations.