Patent ID: 6224472
Filing Date: 2001-05-01
Classification: B24B

Abstract:
A CMP retaining ring, comprising:an inner peripheral surface;an outcr peripheral surface;a lower surface adapted to contact and depress an upper surface of a polishing pad during chemical mechanical polishing of a lower surface of a substrate contained within said inner peripheral surface of said retaining ring during chemical mechanical polishing; andfirst surface characteristics defined on said lower surface of said retaining ring and extending from a position at or adjacent said inner peripheral surface of said retaining ring, to a position at or adjacent said outer peripheral surface of said retaining ring, said first surface characteristics having a plurality of protrusions, recesses, or a nixture thereof and being outwardly inclined relative to a direction of relative rotation between said lower surface of said retaining ring and said upper surface of said pad to impart dynamic peripheral stretching action to said upper surface of said pad in a direction away from a portion of said pad adjacent said substrate toward a portion of said pad in contact with said lower surface of said retaining ring.