Patent ID: 7658816

Claim:
A focus ring having an annular shape, disposed to surround a substrate to be processed on a lower electrode for mounting the substrate to be processed thereon in a processing chamber for accommodating the substrate to be processed on which a specified plasma process is to be performed, which comprises: a lower member made of a dielectric; and an upper member disposed on the lower member and made of a conductive material, wherein the upper member is grounded, wherein a predetermined gap is provided between the upper member and the lower member to thereby maintain a temperature of the lower member to be different from that of the upper member, wherein the upper member is grounded by being connected to a conductive high frequency grounding member, whose surface is coated with an insulating layer, and the insulating layer protects the high frequency grounding member from a plasma of the specified plasma process and prevents a DC current from flowing through the high frequency grounding member, wherein an insulation member is disposed between the lower member and the high frequency grounding member, and wherein the insulation member surrounds the lower member and prevents a DC voltage component from leaking to outside from the lower electrode, and the upper member is in contact with the insulation member without a gap.