Patent ID: 8675173
Filing Date: 2014-03-18
Classification: G03F

Abstract:
1. A lithographic projection apparatus, comprising: a projection system arranged to project a pattern from a patterning device onto an exposure area of a substrate through a liquid confined to a space adjacent the substrate, the projection system having an optical element to project the patterned beam; and a liquid diverter configured to promote a liquid flow in the space in a flow direction substantially parallel to the exposed surface of the substrate, from at least one side of the exposure area toward another side of the exposure area and further away from the substrate than a surface of the liquid diverter adjacent the substrate, at least part of the liquid diverter, in use, located between the substrate and a surface, nearest the substrate and in contact with the liquid, of the optical element and located within an outer lateral boundary of the optical element, and the liquid diverter having a plurality of surfaces extending in a direction substantially perpendicular to the exposed surface of the substrate, a first surface of the plurality of surfaces extending along a side of the exposure area and a second surface of the plurality of surfaces extending along an opposite side of the exposure area, wherein the liquid flow is substantially parallel to the exposed surface of the substrate between an upper and lower bound of the first surface and/or of the second surface.