Patent ID: 6343975
Filing Date: 2002-02-05
Classification: B24B

Abstract:
An apparatus for polishing of a wafer, comprising:a rotatable table; a wafer holder supported by said rotatable table, said wafer holder holding said wafer to expose a surface of said wafer for polishing; and a polishing pad holder for holding a polishing pad against said exposed surface; and an actuator coupled to said polishing pad holder for driving said polishing pad in an orbital circular motion, so as to provide polishing action against said exposed surface of said wafer, wherein said actuator includes a motor driving an off-center shaft which provides said orbital circular motion; a linear bearing coupling said polishing pad holder to said actuator; and an enclosure enclosing said off-center shaft, said linear bearing and said motor, said enclosure forming multiple connected chambers to allow a pressurized air flow to cool said motor.