Patent ID: 7582186

Claim:
A focus ring configured to surround a substrate on a substrate holder in a processing system comprising: a first surface configured to face a process space in said processing system; a second surface, opposite said first surface, configured to contact and be coupled to an upper surface of said substrate holder; an inner radial edge coupled to said first surface and said second surface; an outer radial edge coupled to said first surface and said second surface; a plurality of contact features that include projections and grooves, are formed continuously on the second surface and are configured to couple with a respective plurality of receiving features that include projections and grooves coupled to the upper surface of said substrate holder, wherein each of the projections and grooves of the focus ring couple with corresponding projections and grooves of the substrate holder; and a mating lip, said mating lip including an upper mating surface and a lower mating surface, the lower mating surface configured to engage with a first portion of the upper surface of said substrate holder, the first portion formed on a plane above the remainder of the upper surface of the substrate holder, wherein said focus ring is coupled to said substrate holder using a clamping feature, wherein the clamping feature is different from the contact features and a lower surface of the clamping feature is configured to engage with the upper surface of the mating lip, the upper surface of the mating lip being formed on a plane lower than the first surface facing the process space, wherein the focus ring is substantially circular in shape, and wherein the entire second surface of the focus ring contacts the upper surface of the substrate holder.