Patent ID: 7359032
Filing Date: 2008-04-15
Classification: G03F

Abstract:
1. A lithographic projection apparatus comprising: a radiation system configured to provide a beam of radiation; a first support structure configured to support a patterning device, the patterning device serving to pattern the projection beam according to a desired pattern; a second support structure configured to support a substrate, at least one of said first and second support structures comprising a planar base, a movable stage that can be moved over said planar base, and an actuator configured to move said stage; a projection system configured to project the patterned beam onto a target portion of the substrate; a contactless position measuring device configured to measure a position of said stage; and a first pump configured to generate a conditioned gas flow in a volume between said measuring device and said stage; wherein said base comprises a plurality of gas channels that provide a path for said conditioned gas to flow through said base.