Patent ID: 6074519
Filing Date: 2000-06-13
Classification: H01J

Abstract:
A plasma etching apparatus comprising:a first member having sidewalls, a bottom and an opening, the sidewalls, bottom and opening defining a chamber;a first electrode positioned in the chamber;a second electrode positioned adjacent to the opening of the first member and having an inner surface, the inner surface having a peripheral portion extending beyond the opening and positioned to engage an upper portion of the sidewalls of the first member, the peripheral portion being substantially planar adjacent to the upper portion of the sidewalls;a first sealing member positioned between the peripheral portion of the inner surface of the second electrode and the upper portion of the sidewalls of the first member that provides a seal therebetween;a second sealing member positioned between the peripheral portion of the inner surface of the second electrode and the upper portion of the sidewalls of the first member, the second sealing member encircling the first sealing member; andwherein the first sealing member is a nonconductive O-ring and the second sealing member is a conductive O-ring positioned to electrically couple the sidewalls and the second electrode.