Apparatus for monitoring and controlling force applied on workpiece surface during electrochemical mechanical processing

摘要

In one aspect, the present invention monitors a signal corresponding to a torque value of a motor that is used to maintain relative motion between a conductive top surface of a workpiece and a workpiece surface influencing device in the presence of physical contact between the conductive top surface of the workpiece and the workpiece surface influencing device. In another aspect, the present invention uses the signal to control a force applied to a top conductive surface of a workpiece during electrotreatment.