Patent ID: 6507388
Filing Date: 2003-01-14
Classification: G03F

Abstract:
A lithographic projection apparatus comprising:a projection beam illumination system which supplies a projection beam of radiation; a projection beam patterning device which patterns the projection beam according to a desired pattern; a substrate table for holding a substrate; and a projection system which images the patterned beam onto a target portion of the substrate; a vacuum chamber in which at least one of said projection beam patterning device and said substrate table is contained; and an alignment system constructed and arranged to align said projection beam patterning device and a substrate on said substrate table, said alignment system comprising a passive part contained in said vacuum chamber and an active part outside said vacuum chamber, wherein said active part comprises a measurement beam generator constructed and arranged to generate a measurement beam of radiation and a detector; and said passive part comprises optical components constructed and arranged to direct said measurement beam onto a mark, to receive radiation reflected thereby and to direct it into a signal beam.