Patent ID: 7336343
Filing Date: 2008-02-26
Classification: G03F,Y10S

Abstract:
1. A lithographic apparatus, comprising: an illumination system configured to condition a beam of radiation; an array of individually controllable elements configured to pattern the beam; and a projection system configured to project the patterned beam onto a target portion of a substrate, the projection system defining a pupil and comprising an array of lenses, wherein the array of lenses is arranged to direct a respective part of the patterned beam towards a respective part of the target portion of the substrate, wherein the individually controllable elements are arranged in groups, such that the patterned beam is directed by each element in each respective group towards a corresponding lens in the lens array, and wherein the individually controllable elements in each group are controlled together to direct the patterned beam away from the pupil, whereby a pattern imparted onto the beam by that group of individually controllable elements is substantially symmetrical with respect to the pupil.