Patent ID: 6937316

Claim:
A lithographic projection apparatus, comprising: a radiation system constructed and arranged to provide a beam of radiation; a support constructed and arranged to support a patterning device, the patterning device constructed and arranged to pattern the beam according to a desired pattern; a substrate table that holds a substrate; a projection system constructed and arranged to project the patterned beam onto a target portion of the substrate; wherein at least part of at least one of the radiation system, the support, the substrate table and the projection system is accommodated in a sealed chamber and a bellows is provided to provide a closed passage between the sealed chamber and another chamber or a pump, the passage having a longitudinal axis, wherein the bellows comprises: a first section having a plurality of smooth corrugations extending helically about the longitudinal axis such that opposite ends of the first section may be rotated relative to each other; and a second section adapted to be changeable in length to compensate for changes in length of the first section, wherein a radius of curvature of the smooth corrugations is larger than a thickness of the bellows material.