Patent ID: 9581914
Date: 2017-02-28
CPC Classifications: B01D,C02F,G03F

Claim:
1. A lithographic apparatus comprising a substrate table constructed to hold a substrate; a projection system configured to project a patterned radiation beam onto a target portion of the substrate; a liquid supply system configured to at least partly fill a space between a final element of the projection system and the substrate with an immersion liquid, the liquid supply system comprising a liquid purifier configured to at least partially purify the immersion liquid, the liquid purifier comprising at least one selected from: a distillation unit, a de-hydrocarbonating unit configured to reduce the hydrocarbon content of the immersion liquid, a demineralizer, a filter, and/or a source to provide ultra-violet radiation; a liquid confinement structure constructed to at least partially confine the immersion liquid to the space, wherein the substrate table is movable relative to the liquid confinement structure during projection of the patterned radiation beam and wherein the liquid confinement structure has: an opening, in a bottom surface of the member, configured to remove fluid from the space, and an open aperture located underneath a lower surface of the projection system and above the table, a cross-sectional dimension of the aperture being smaller than a cross-sectional dimensional of the lower surface of the projection system, the open aperture configured to allow the liquid to flow therethrough between above the open aperture and below the open aperture, and the open aperture configured to allow the radiation beam to pass therethrough; and an inlet configured to supply the immersion liquid to the space at a position located above the aperture.