Patent ID: 6319106
Filing Date: 2001-11-20
Classification: B24B,H01L

Abstract:
A wafer polishing apparatus, comprising:a platen which rotates; anda holding head which holds a wafer and presses the wafer against the platen to polish an obverse of the wafer, the holding head comprisinga head body which is rotated and arranged to face the platen,a carrier which is supported to the head body to be movable vertically,an air blowing member which is provided at a bottom face of the carrier and blows air toward a reverse of the wafer to form a pressurized air layer between the carrier and the wafer,a pressing device which presses the carrier toward the platen to press the wafer against the platen through the pressurized air layer, anda retainer ring which is mounted on an outer periphery of the carrier via a buffer member and pressed against the platen during polishing the wafer to prevent the wafer from jumping out of the carrier while enclosing the wafer to hold a center of the wafer on a central axis of the carrier.