Patent ID: 7244347
Filing Date: 2007-07-17
Classification: C25D,H01L

Abstract:
1. A system for electrical contact with a conductive back layer on a back edge surface of a wafer, the conductive layer on the back edge surface being in electrical contact with a conductive front layer disposed on a front surface of the wafer through a conductive bevel edge of the wafer, the wafer being held by a wafer carrier, the system comprising: at least one contact member that has electrical contact with the conductive back layer at the back edge surface of the wafer, and wherein relative rotational motion between the at least one contact member and the back edge surface of the wafer cause the at least one contact member to electrically contact different parts of the back edge surface of the wafer at different times, wherein the system is configured to cause lateral motion of the wafer while the relative rotational motion is maintained, and to cause a corresponding lateral motion of the at least one contact member in synchronism, thereby maintaining the electrical contact during the lateral motion of the wafer.