Patent ID: 7411658
Filing Date: 2008-08-12
Classification: G03F

Abstract:
1. A lithographic apparatus, comprising: a projection system configured to project a patterned radiation beam onto a target portion of a substrate; a barrier member, surrounding a space between the projection system and the substrate, to define in part a reservoir for liquid; and a protrusion which surrounds the projection system and is on the barrier member such that a surface of the protrusion is closer to the projection system than a part of the barrier member on a radially outward side of the protrusion is to the surface of the projection system, or the protrusion is on the projection system such that a surface of the protrusion is closer to the barrier member than a part of the projection system on a radially outward side of the protrusion is to the surface of the barrier member; wherein, in a use, liquid simultaneously contacts the surface of the protrusion and a surface of the projection system facing the surface of the protrusion when the protrusion is on the barrier, or simultaneously contacts the surface of the protrusion and a surface of the barrier member facing the surface of the protrusion when the protrusion is on the projection system.