Patent ID: 6273803
Filing Date: 2001-08-14
Classification: B24B

Abstract:
A carrier for carrying a wafer having front and back surfaces, said carrier comprising:a carrier body having a pressure chamber formed by a depression opening downward covered from below by a pliable sheet;a retainer ring for holding the wafer, said retainer ring being attached to the outer periphery of the bottom surface of the pliable sheet and being formed by a soft material; anda pliable margin block having a bottom surface that deforms in accordance with the back surface of the wafer, said pliable margin block projecting out an equal thickness at the bottom surface of the pliable sheet and being positioned at the inside of said retainer ring;wherein a bottom surface of the retainer ring and a front surface of the wafer are substantially coplanar when the wafer is positioned within the carrier for polishing.