Patent ID: 6353271
Filing Date: 2002-03-05
Classification: G03F

Abstract:
A stage for precise positioning of a chuck in three orthogonal linear axes and in three orthogonal rotation axes that comprises:(a) a first subassembly comprising: (i) a monolithic mirror that supports the chuck wherein the monolithic mirror has at least two polished orthogonal faces for interferometric determination of the X , Y, and &THgr;z positions; (ii) a plurality of electromagnetic actuators that control fine positioning in all six axes and coarse positioning in one axis; (iii) a position sensor for measuring the vertical Z position of the monolithic mirror; and (iv) a Lorentz actuator, that includes a magnet array, for effecting motion in the Y axis wherein the magnet array is mounted on a strain reducing flexure mount that has a single rigid attachment location and a plurality of flexible attachment locations; and (b) a second subassembly comprising a stepping axis beam over which the first subassembly is suspended, wherein the stepping axis beam includes a drive coil array for the Lorentz actuator, wherein the second subassembly further comprises a cable stage subassembly.