Patent ID: 6388861
Filing Date: 2002-05-14
Classification: H01L,H02N,Y10T

Abstract:
Apparatus for electrostatic clamping of a workpiece, comprising:a platen including at least three platen sections, said at least three platen sections comprising a conductive material and being electrically isolated from each other; a dielectric material disposed on said at least three platen sections, said dielectric materials having a clamping surface for receiving a workpiece; and means for applying a polyphase clamping voltage to said platen, said at least three platen sections being connected to different phases of said polyphase clamping voltage so that the workpiece is electrostatically clamped in a fixed position on said clamping surface by electrostatic force between the workpiece and said platen sections, said electrostatic clamping apparatus being operable to clamp the workpiece to said clamping surface in vacuum.