Patent ID: 6033292
Filing Date: 2000-03-07
Classification: B24B

Abstract:
A wafer polishing apparatus which presses a wafer against a rotating turn table to polish a face of the wafer, said wafer polishing apparatus comprising:a rotary head body arranged opposite to said turn table;a carrier contained in said head body in a manner that is vertically movable, said carrier supporting the wafer to press the wafer against said turn table;a retainer ring contained in said head body in a manner that is vertically movable, said retainer ring concentrically arranged at the periphery of said carrier, said retainer ring coming into contact with said turn table and holding the periphery of the wafer during polishing;an elastic sheet provided in a space in said head body above said carrier and said retainer ring;a first space which presses said carrier and a second space which presses said retainer ring, said first and second spaces being formed in said head body; andwherein said elastic sheet is concentrically divided into at least a central part closing said first space and a peripheral part closing said second space and pressurized air supplied to said first and second spaces elastically deforming the central part and the peripheral part of said elastic sheet, respectively, such that the central part presses said carrier against said turn table and said peripheral part presses said retainer ring against said turn table.