Patent ID: 8373843

Claim:
A lithographic apparatus comprising: a projection system which projects a patterned radiation beam onto a target portion of a substrate; a liquid supply system which at least partly fills a space between the projection system and the substrate with a liquid, the liquid supply system comprising a liquid confinement member with which the liquid is confined within the space, the liquid confinement member having a liquid supply inlet on a lower surface thereof, the substrate being moved below the liquid confinement member, and a surface of the substrate being opposite to an undersurface of the liquid confinement member during the projection; an outlet which removes liquid, the outlet removing the liquid from on the surface of the substrate facing the outlet such that the liquid on the surface of the substrate covers only a portion of the surface of the substrate during the projection, and the liquid supply inlet being disposed closer to a path of the patterned radiation beam from the projection system than the outlet; and an evacuation system which draws the liquid through the outlet, the evacuation system comprising a tank and a tank pressure controller which maintains a stable pressure within the tank, the liquid on the surface of the substrate being drawn through the outlet by the stable pressure within the tank during the projection.