Patent ID: 8525971
Filing Date: 2013-09-03
Classification: G03B,G03F

Abstract:
1. A cleaning method used in a lithographic apparatus in which a substrate held on a holding portion of a substrate table is exposed by projecting a patterned beam of radiation from a projection system onto the substrate through an immersion liquid that is supplied by a supply unit and that covers a portion of a surface of the substrate during the exposure, the method comprising: moving the substrate table in a state in which the substrate is not held on the holding portion of the substrate table and in which an object, that is not subjected to an exposure for device-manufacturing, is held on the holding portion in place of the substrate; and cleaning a measurement portion of the substrate table using a cleaning liquid, that is different from the immersion liquid, supplied by the supply unit onto the substrate table when the substrate table is in the state in which the substrate is not held on the holding portion and in which the object is held on the holding portion in place of the substrate, the measurement portion being used for a measurement and the measurement portion being different from the holding portion, wherein the cleaning liquid removes foreign matter from the measurement portion.