Patent ID: 6113463
Filing Date: 2000-09-05
Classification: B24B

Abstract:
An apparatus for polishing a chamfer of a wafer having an orientation flat part and comprising:a wafer rotating mechanism for rotating the wafer mounted thereon,a buffing wheel rotating mechanism for rotating a buffing wheel for polishing the wafer,a pressing mechanism for pressing the wafer and the buffing wheel with a predetermined pressure, the rotating buffing wheel being pressed against the chamfer with a predetermined pressure while the wafer is rotated by the wafer rotating mechanism,a wafer polishing position detector for detecting wafer polishing positions; andwafer rotation speed control means for controlling the wafer rotation speed according to a detection signal from the wafer polishing position detector;the wafer rotation speed being changed in correspondence to wafer polishing positions of an intrinsic peripheral part, corners and said orientation flat part of the wafer according to said detection signal from the wafer polishing position detector so that the wafer rotation speed during polishing of the intrinsic peripheral part is less than the wafer rotation speed during polishing of the corners and greater than the wafer rotation speed during polishing of the orientation flat part.