Patent ID: 8717533
Filing Date: 2014-05-06
Classification: G03B,G03F

Abstract:
1. A lithographic projection apparatus arranged to project a pattern from a patterning device onto a substrate through a liquid confined to a space, the space being smaller in plan than the substrate, the apparatus comprising: a projection system having an optical element, the optical element having a lower surface via which a patterned radiation beam is projected, the lower surface extending in a direction substantially perpendicular to an optical axis of the projection system, and the optical element having an outer surface extending upwardly from the lower surface; a liquid confinement member configured to confine the liquid within the space under the projection system, the liquid confinement member surrounding an end portion of the projection system and a gap being formed between the outer surface of the optical element and the liquid confinement member; a first support member configured to support the liquid confinement member; a second support member configured to support the projection system; and an anti-vibration system arranged between the first support member and the second support member, the anti-vibration system preventing vibrations from being transmitted from one of the first support member and the second support member to the other of the first support member and the second support member; wherein the liquid confinement member includes: a plate portion substantially parallel to the substrate to divide the space into two parts, the plate portion having an open aperture to allow transmission of the pattern onto the substrate, the substrate being moved below the plate portion; and a liquid extraction port which extracts liquid from a part of the space adjacent the substrate, the liquid extraction port being arranged to surround the open aperture and being configured to extract the liquid on the substrate from above the substrate positioned opposite to the liquid extraction port.