Patent ID: 7248334
Filing Date: 2007-07-24
Classification: G03F

Abstract:
1. A lithographic apparatus, comprising: a support structure configured to hold a patterning device, the patterning device configured to pattern a beam of radiation according to a desired pattern; a substrate table configured to hold a substrate; a projection system configured to project the patterned beam onto a target portion of the substrate; a measurement system configured to measure a parameter of (a) the substrate table, or (b) the substrate, or (c) an image projected by the projection system, or (d) any combination of (a)-(c); a liquid supply system configured to supply a liquid to a space between the substrate and the projection system; and a shield disposed in a vicinity of a portion of the measurement system, the shield or a portion thereof movable between a first position where the shield or portion thereof is configured to shield the portion of the measurement system from the liquid and a second position where the shield or portion thereof is configured to expose the portion of the measurement system to an environment substantially without liquid.