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

Claim 16:
17. A system for chemical mechanical polishing, comprising: a plurality of pressure sources; a carrier head that includes: a base assembly, a membrane assembly having 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 the plurality of individually pressurizable inner chambers include pairs of adjacently positioned chambers with each pair of adjacently positioned chambers defining a gap therebetween, the gap open to a lower chamber, 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 the lower chamber between the inner surface of the outer membrane and a lower surface of the inner membrane, wherein the inner surface is positioned to contact 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; and a controller connected to at least one of the plurality of pressure sources, the controller configured to cause the pressure sources to pressurize the plurality of individually pressurizable inner chambers and the lower chamber such that one or more of the individually pressurizable inner chambers are pressurized to a pressure equal to or greater than a pressure of the lower chamber to supplement the pressure applied by the lower chamber to the outer membrane to the substrate at a portion of the outer membrane corresponding to the one or more individually pressurizable inner chambers.