Patent ID: 8964163
Filing Date: 2015-02-24
Classification: G03F

Abstract:
1. A lithographic projection apparatus comprising: a substrate table configured to hold a substrate; a projection system arranged to project a patterned radiation beam onto a target portion of the substrate, the projection system comprising a first optical element and a second optical element, wherein the first optical element is movable with respect to the second optical element; a frame having a substantially horizontal part extending across the top of the projection system and a substantially vertical part extending from the substantially horizontal part to below the bottom of the projection system to connect to the ground, wherein the frame supports a housing holding a plurality of optical elements of the projection system, the housing is connected to the substantially horizontal part of the frame by a substantially vertical structure, separate from the substantially vertical part, extending down from the substantially horizontal part of the frame and between the substantially horizontal part of the frame and the housing, and the housing is movable with respect to the frame; and a liquid supply system configured to at least partly fill a space between the projection system and the substrate table, with a liquid.