Patent ID: 7113254
Filing Date: 2006-09-26
Classification: G02B,G03F

Abstract:
1. A lithographic projection apparatus comprising: a radiation system for providing a beam of radiation; a support for supporting a patterning device, the patterning device serving to pattern the beam of radiation according to a desired pattern; a substrate table for holding a substrate; a projection system for projecting the patterned beam onto a target portion of the substrate; and a purge gas supply system for providing a purge gas mixture to part of the lithographic projection apparatus, said purge gas supply system comprising a purge gas mixture generator comprising a moisturizer arranged for adding moisture to a purge gas to generate the purge gas mixture; a purge gas mixture outlet connected to the purge gas mixture generator for supplying the purge gas mixture to said at least part of the lithographic projection apparatus; and a purge gas outlet arranged for providing said purge gas substantially without moisture to another part of the lithographic projection apparatus.