Patent ID: 7326105

Claim:
A carrier head for retaining a micro-device workpiece during at least one of mechanical polishing and chemical-mechanical polishing, the carrier head comprising: a workpiece holder configured to receive the workpiece; and a retaining ring carried by the workpiece holder, the retaining ring including; an inner surface; an outer surface; a base surface extending at least partially between the inner and outer surfaces; an annular groove positioned adjacent to the base surface between the inner and outer surfaces; and a plurality of transverse grooves extending from the inner surface to the annular groove, wherein the plurality of transverse grooves includes at least a first transverse groove and an adjacent second transverse groove, wherein the first transverse groove intersects the annular groove at a first angle and the second transverse groove intersects the annular groove at a second angle different than the first angle, the transverse grooves terminating before reaching the outer surface.