Patent ID: 8810768
Filing Date: 2014-08-19
Classification: G03F

Abstract:
1. A lithographic projection apparatus in which liquid is disposed between a projection system and a substrate onto which the projection system projects an image during exposure of the substrate, the lithographic projection apparatus comprising: a liquid confinement member extending along at least a part of a boundary of a space between the projection system and the substrate, the space having a cross-sectional area smaller than the area of the substrate, the liquid confinement member positioned adjacent a final surface of the projection system, confining the liquid within the space, and comprising: a first opening formed in a face of the member, the face arranged to oppose a surface of the substrate, the first opening located radially outward, with respect to an optical axis of the projection system, of the space to supply gas, and a second opening formed in the face and located radially outward, with respect to an optical axis of the projection system, of the first opening to remove fluid.