Patent ID: 8545290
Filing Date: 2013-10-01
Classification: B24B

Abstract:
1. A wafer polishing apparatus, comprising: a lower frame; a base mounted on said lower frame; a turntable having an upper surface and a turntable axis of rotation, wherein said turntable is rotationally coupled to said base; a polishing pad removably attached to said upper surface of said turntable, wherein said polishing pad includes a work surface for wafer polishing; an upper frame movably coupled to said base; at least one polishing head rotatably coupled to said upper frame; at least one drive mechanism mounted on upper frame wherein each of said at least one polishing head further comprises a polishing head axis of rotation parallel to and not coincident with said turntable axis of rotation, and each of the at least one polishing head is coupled to a at least one head drive mechanism for driving of said at least one polishing head in rotation and vertical motion with selected downward pressure of the polishing head; at least one wafer alignment assembly attached to each of said at least one polishing head, wherein each of said at least one wafer alignment assembly comprises: