Patent ID: 9261797
Filing Date: 2016-02-16
CPC Classification: G03F

Claim Text:
1. A lithographic projection apparatus arranged to project a beam of radiation onto a substrate through a liquid, the apparatus comprising: a movable table; a liquid confinement structure configured to at least partly confine the liquid to a space adjacent the table such that the liquid extends between a lower surface of the liquid confinement structure and the table; and an outlet configured to remove liquid from between the lower surface of the liquid confinement structure and the table, the outlet arranged in a substantially polygonal shape in the horizontal, wherein the shape extends around a path of the radiation beam through the liquid and corners of the polygonal shape are arranged such that a distance between a first pair of non-adjacent corners of the polygonal shape is larger than a distance between a second pair of non-adjacent corners of the polygonal shape, wherein the lower surface has an aperture, the aperture substantially conforming in shape to an image field of the beam of radiation and configured to allow the beam of radiation to pass therethough to the substrate, the outlet being outward, relative to the path of the beam, of the aperture.