Patent ID: 6056632
Filing Date: 2000-05-02
Classification: B24B

Abstract:
A carrier for an apparatus which performs chemical-mechanical planarization of a surface of a workpiece, wherein the carrier comprises:a rigid plate having a major surface;a wafer carrier membrane of soft, flexible material with a wafer contact section having an outer surface and an inner surface wherein the outer surface is for contacting an opposite surface of the workpiece, the wafer carrier membrane connected to the rigid plate and extending across at least a portion of the major surface thereby defining a first cavity therebetween;an internal wafer carrier membrane with a section having an outer surface for contacting the inner surface of the wafer contact section, the internal wafer carrier membrane connected to the rigid plate and extending across at least a portion of the major surface thereby defining a second cavity therebetween;a first fluid conduit by which a source of pressurized fluid is connected to the first cavity; anda second fluid conduit by which a source of pressurized fluid is connected to the second cavity.