Patent ID: 7612867
Filing Date: 2009-11-03
Classification: G03F

Abstract:
1. A lithographic apparatus, comprising: an illumination system configured to condition a beam of radiation; a support configured to support a patterning device that imparts a desired pattern to the beam of radiation; a substrate holder configured to hold a substrate; and a projection system configured to project the patterned beam onto a target portion of the substrate; and a spatial filter configured to selectively obstruct a portion of the patterned beam; wherein the spatial filter comprises a first pair and a second pair of spatial filtering structures disposed in a path of the projection beam, wherein the first pair of spatial filtering structures are disposed at a predetermined distance from each other along a direction and the second pair of spatial filtering structures are disposed at a predetermined distance from each other in the same direction, and wherein the second pair of spatial filtering structures are arranged to move with respect to the first pair of spatial filtering structures so as to cause the projection beam to scan in the same direction.