Patent ID: 11951589
Assignee: APPLIED MATERIALS, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 7:
8. A chemical mechanical polishing system comprising:
a rotatable platen to hold a polishing pad, the platen rotatable by a motor, the polishing pad having a polishing surface and a polishing control groove concentric with an axis of rotation for the polishing pad, the polishing control groove having a plurality of arcuate segments;
a rotatable carrier head to hold a substrate against the polishing surface of the polishing pad during a polishing process, the carrier head rotatable by an actuator; and
a controller configured to control the motor and the actuator such that rotation of the platen is synchronized with rotation of the carrier head, and over a plurality of successive rotations of the carrier head when a first angular swath of an edge portion of the substrate is at an azimuthal angular position about an axis of rotation for the carrier head the first angular swath overlies a region of the polishing surface between the plurality of arcuate segments a second angular swath of the edge portion of the substrate, otherwise over-polished relative to the first angular swath, is at the azimuthal angular position the second angular swath overlies an arcuate segment of the polishing control groove.