Patent ID: 6409583
Filing Date: 2002-06-25
Classification: B24B

Abstract:
An apparatus for polishing the surface of a wafer by holding the wafer by a holder head and pushing the wafer onto a polishing pad on a rotary polishing table, wherein:said holder head includes a head body that rotates and is arranged being opposed to said polishing table, a carrier loosely supported by said head body so as to move up and down, and a retainer ring supported by said head body so as to move up and down and is arranged along the outer periphery of said carrier in concentric therewith so as to surround the periphery of the wafer at the time of polishing; a first pushing means is arranged along the outer periphery under the lower surface of said head body to push said carrier holding the wafer onto said polishing pad; and a second pushing means is arranged at a central portion under the lower surface of said head body to push said retainer ring onto said polishing pad.