Patent ID: 7882800
Filing Date: 2011-02-08
Classification: H01J,H01L,Y10S

Abstract:
1. A ring mechanism comprising: a focus ring surrounding an object to be processed mounted on a susceptor disposed in a processing chamber capable of maintaining a vacuum therein; and a cover ring fitted around an outer periphery of the focus ring, wherein the cover ring includes a first and a second cover ring part and a first clearance or an electrical conductor is disposed between the first and the second cover ring part, wherein the first cover ring part surrounds an outer periphery of the focus ring, and the second cover ring part surrounds an outer periphery of the first cover ring part, wherein the second cover ring part has a tapered surface, a height of the tapered surface descending toward an outer peripheral side of the second cover ring, and wherein the second cover ring part is an electrically insulating ring.