Patent ID: 7211174
Filing Date: 2007-05-01
Classification: C25D,H01L

Abstract:
1. A system for electrical contact with a wafer having a conductive layer with an edge surface on a front surface thereof during processing of the wafer, comprising: at least one contact member that establishes electrical contact with the conductive layer only at the edge surface of the wafer, the at least one contact member comprising a base support member and at least one contact element coupled to the base support member, wherein the at least one contact element maintains continuous electrical contact with a respective exposed edge of the front surface of the workpiece and comprises a brush, the brush including a bundle of conductive wires that contact the front surface of the workpiece at a slant angle so that the workpiece is uni-directionally rotatable against the at least one contact member and the relative movement between the at least one contact member and wafer during processing of the wafer cause the at least one contact member to electrically contact different parts of the edge surface of the wafer.