Patent ID: 6447379
Filing Date: 2002-09-10
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 first diaphragm of soft, flexible material with a first section for contacting a first surface portion of the workpiece, the first diaphragm being connected to the rigid plate and extending across at least a first portion of the major surface thereby defining a first cavity therebetween; a second diaphragm of soft, flexible material with a second section for contacting a second surface portion of the workpiece, the second diaphragm being connected to the rigid plate and extending across at least a second portion of the major surface thereby defining a second cavity therebetween; a plurality of fluid conduits by which a source of pressurized fluid is connected to at least one of the cavities; and an inter-diaphragm cavity formed between a portion of the first diaphragm, a portion of the second diaphragm, and a portion of the workpiece.