Patent ID: 9624574
Date: 2017-04-18
CPC Classifications: C23C,H01L

Claim:
1. A platen for holding a workpiece, comprising: a surface on which said workpiece is disposed; a plurality of grounding structures, comprising a first subset of grounding structures; and a second subset of grounding structures, said second subset different from said first subset, wherein the plurality of grounding structures comprises grounding pins having a tapered end configured to penetrate a back surface of said workpiece, and grounding structures having a flat end configured to contact said back surface; and an actuator, in communication with said first subset of grounding structures, to move said first subset of grounding structures from a first position where said first subset does not contact said back surface of said workpiece to a second position where said first subset is extended above said surface so as to contact said back surface, and also in communication with said second subset of grounding structures, to move said second subset from a first position where said second subset does not contact said back surface of said workpiece to a second position where said second subset is extended above said surface so as to contact said back surface.