Patent ID: 6747731
Filing Date: 2004-06-08
Classification: F16C,F16F,G03F

Abstract:
A lithographic projection apparatus comprising:a radiation system which provides a projection beam of radiation; a patterning structure support to support a projection beam patterning structure which patterns the projection beam according to a desired pattern; a substrate table to hold a substrate; a projection system which projects the patterned beam onto a target portion of the substrate; a support member constructed and arranged to support a portion of the lithographic projection apparatus; and a vacuum chamber having a wall enclosing the support member, wherein the support member comprises: a gas-filled pressure chamber, the gas in the pressure chamber acting on a movable member such as to at least partially counteract a force substantially parallel to the support direction, and a gas evacuating structure constructed and arranged to evacuate gas escaping towards the vacuum chamber through a gap between the movable member and a bearing surface.