Patent ID: 9477153
Filing Date: 2016-10-25
CPC Classification: G03F,H01L

Claim Text:
1. A lithographic apparatus comprising: a substrate table constructed to hold a substrate; a projection system configured to project a patterned radiation beam via an exposure field at the substrate, the projection system having an optical element immediately adjacent the substrate, the optical element having a radiation emitting surface adjacent the substrate, the radiation emitting surface having a cross-sectional shape in a plane parallel to the substrate that has a plurality of sides, and the optical element comprising at least two lateral surfaces, each of the at least two lateral surfaces extending diagonally upwardly from a respective side of the radiation emitting surface and two of at least two lateral surfaces joining at an edge defined by an essentially straight line extending diagonally upwardly; and a liquid supply system configured to provide a liquid to a space between the optical element and the substrate table, wherein the exposure field is not, in plan, centered under the middle of the projection system.