Patent ID: 11945073
Assignee: APPLIED MATERIALS, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 14:
15. A carrier head for chemical mechanical polishing, comprising: a base assembly; a flexure connecting the base assembly and a membrane assembly, the membrane assembly including a membrane support, an inner membrane secured to the membrane support, wherein the inner membrane forms a plurality of individually pressurizable inner chambers between an upper surface of the inner membrane and the membrane support, wherein each chamber of the plurality of individually pressurizable inner chambers is provided by a floor portion and two side wall portions of the inner membrane, and wherein said two side wall portions for adjacent chambers are separated by a gap, and an outer membrane secured to the membrane support and extending below the inner membrane, the outer membrane having an inner surface and an outer surface, wherein the outer membrane defines a lower pressurizable chamber between the inner surface of the outer membrane and a lower surface of the inner membrane, wherein the inner surface is positioned for contact by the lower surface of the inner membrane upon pressurization of one or more of the plurality of individually pressurizable inner chambers, and wherein the outer surface is configured to contact a substrate.