Patent ID: 8786830
Filing Date: 2014-07-22
Classification: G03B,G03F

Abstract:
1. An immersion lithographic apparatus comprising: a projection system arranged to project an image onto a substrate held by a substrate table through an immersion liquid provided in a space between the projection system and the substrate; a pressure sensor configured to generate a pressure signal indicative of the pressure of the immersion liquid in the space the pressure sensor associated with an immersion fluid flow which flows out of the space through an opening in an opening surface; an extraction conduit configured to extract immersion liquid from the space through the opening; a positioner configured to position the substrate table to position the substrate table relative to the projection system; and a control system responsive to the pressure signal and configured to control a force applied to the substrate table by the positioner based on the pressure signal, wherein the sensor is located in the extraction conduit, and wherein the apparatus comprises an additional pressure sensor that is provided in the opening surface.