Patent ID: 8542344
Filing Date: 2013-09-24
Classification: G03F

Abstract:
1. A lithographic projection apparatus, comprising: a movable table; a projection system configured to project a patterned beam of radiation onto a target portion of a substrate; a liquid supply system configured to at least partly fill a space between the projection system and the table with a liquid to form a liquid reservoir covering a smaller area than the substrate, the liquid supply system comprising a liquid confinement structure extending along at least a part of the boundary of the space, the liquid confinement structure comprising an inlet configured to provide liquid to the liquid reservoir, the inlet having a conduit extending from above a bottom surface of an optical element of the projection system to an opening of the inlet between the table and the bottom surface of the optical element, the optical element arranged to contact the liquid in the liquid reservoir; and a passage between the optical element and an inner periphery of the liquid confinement structure to allow liquid therein from the liquid reservoir.