Patent ID: 9715179
Date: 2017-07-25
CPC Classifications: G03B,G03F

Claim:
1. A lithographic apparatus comprising: a projection system configured to project a patterned radiation beam onto a target portion of a substrate, the projection system having a final element; a barrier member surrounding a space between the projection system and, in use, the substrate, to define in part with the final element a reservoir for liquid, the barrier member being spaced from the final element to define a gap therebetween; and a deformable protrusion extending into the gap between an outer surface of the final element and an outer surface of the barrier member, wherein the outer surface of the barrier member and/or of the final element comprises a substantially horizontal outer surface that is at least partially liquidphobic and wherein, in use, the liquid in the reservoir reaches to at or above the level of the substantially horizontal surface.