Patent ID: 6927840
Filing Date: 2005-08-09
Classification: G03F,H01L

Abstract:
1. A lithographic device comprising: a radiation source; a mask table; a projection system having a main axis; a substrate table; a drive unit for displacing the substrate table relative to the projection system in at least one direction perpendicular to the main axis, the drive unit comprising a stationary part which is coupled to a reaction frame of the lithographic device; a measuring system for measuring a position of the substrate table relative to the projection system, the measuring system having a plurality of measurement sensors that have a stationary part and a movable part; the movable part of a first one of the sensors is coupled to the substrate table for cooperation with the stationary part of the first one of the sensors; a support frame which is mechanically isolated from the reaction frame and to which the stationary parts of the sensors are coupled.