Patent ID: 6234879
Filing Date: 2001-05-22
Classification: B24B

Abstract:
An apparatus for polishing chamfers of a semiconductor wafer having an orientation flat formed thereon, said apparatus includinga hollow, cup-like cylindrical hollow polishing buff adapted to be rotated on a shaft and having a cylindrical wall at an outer periphery thereof including first and second substantially cylindrical polishing surfaces on outer and inner sides of said cylindrical wall, respectively, wherein said first and second polishing surfaces are adapted to polish different chamfers of said semiconductor wafer,said first polishing surface on said outer side of said cylindrical wall being shaped to polish chamfers of said orientation flat of said wafer, andsaid second polishing surface on said inner side of said cylindrical outer-wall being shaped to polish chamfers at a periphery of said wafer other than said orientation flat, andwherein one of said first and second polishing surfaces includes a groove.