Patent ID: 7988814
Filing Date: 2011-08-02
Classification: H01J

Abstract:
1. A plasma processing apparatus which processes a substrate to be processed placed on a mounting table disposed in a process chamber, by generating plasma in the process chamber by application of high-frequency voltage, the apparatus comprising: a focus ring disposed to surround a periphery of the substrate to be processed placed on the mounting table, wherein said focus ring includes a ring-shaped first insulating member and a ring-shaped first conductive member disposed on top of the first insulating member, and the first conductive member includes: an outer ring portion disposed on an outer side of the periphery of the substrate to be processed placed on the mounting table; and an inner ring portion disposed under and at a predetermined interval apart from a peripheral edge portion of the substrate to be processed placed on the mounting table, wherein an interval L wherein the inner ring portion and the mounting table are electrically insulated from each other, wherein a second conductive member electrically connected to ground is disposed close to the outer ring portion insulated from the mounting table by the first insulating member, and a second insulating member is interposed between the outer ring portion and the second conductive member, wherein the first insulating member includes a first inner circumferential surface with the same diameter as an inner surface of the inner ring portion, a second inner circumferential surface which abuts the mounting table, a first outer circumferential surface which abuts an inner circumferential surface of the second insulating member and a first inner circumferential surface of the second conductive member, and a second outer circumferential surface which abuts a second inner circumferential surface of the second conductive member, and wherein a diameter of the second inner circumferential surface of the first insulating member is greater than the diameter of the first inner circumferential surface of the first insulating member and a diameter of the second outer circumferential surface of the first insulating member is greater than a diameter of the first outer circumferential surface of the first insulating member.