Patent ID: 8767173
Filing Date: 2014-07-01
Classification: G03F

Abstract:
1. A lithographic projection apparatus arranged to project a pattern from a patterning device onto a substrate using a projection system, the lithographic projection apparatus comprising: a liquid supply system configured to at least partly fill a space between the projection system and the substrate with a liquid, wherein an element of the projection system through which the pattern is projected has, on a surface configured to be in contact with the liquid, a protective coating formed directly on the element, the protective coating being substantially insoluble in the liquid and being SiO the element has an end portion through which an optical axis of the projection system passes and an inclined surface which is inclined with respect to the optical axis, and the liquid supply system includes a supply nozzle and a recovery nozzle, the supply nozzle and the recovery nozzle being arranged symmetrically about the element.