Patent ID: 8029333
Filing Date: 2011-10-04
Classification: B24B

Abstract:
1. A device for polishing the peripheral edge part of a semiconductor wafer, said device comprising: a wafer stage having a surface for holding said semiconductor wafer; a wafer stage unit including a stage rotating part for rotating said wafer stage and a reciprocating motion part for causing said wafer stage to undergo a rotary reciprocating motion in the same plane as said surface; a stage moving part for moving said wafer stage parallel to said surface; and two or more polishing parts for polishing the peripheral edge part of said semiconductor wafer being held by said wafer stage; wherein said reciprocating motion part serves to cause said wafer stage to undergo a reciprocating rotary motion around an axis that passes through a point on the outer periphery of said semiconductor wafer such that said semiconductor wafer undergoes a reciprocating rotary motion around a notch on said semiconductor wafer.