Patent ID: 9048276
Filing Date: 2015-06-02
Classification: B23B,H01L,Y10T

Abstract:
1. An electrostatic clamp for selectively maintaining a position of a workpiece, the electrostatic clamp comprising: a backing plate for providing structural support and rigidity to the electrostatic clamp, wherein the backing plate has a first coefficient of thermal expansion associated therewith, wherein the backing plate consists of a metal, therein defining a metallic backing plate; and a clamping plate having a clamping surface configured to contact the workpiece, wherein the clamping plate has a second coefficient of thermal expansion associated therewith, wherein the clamping plate comprises a ceramic material, therein defining a ceramic clamping plate, wherein the clamping plate is bonded to the backing plate, and wherein the first coefficient of thermal expansion and second coefficient of thermal expansion are minimized, with a maximum difference determined by the geometry of the electrostatic clamp.