Patent ID: 6893532
Filing Date: 2005-05-17
Classification: H01J

Abstract:
1. A plasma processing apparatus in which particulate dust is generated when a substrate is processed by plasma in a high vacuum enclosure, and a reactive material is introduced into the high vacuum enclosure, the apparatus comprising: a plasma generating electrode and at least one particulate collecting electrode, wherein the said at least one collecting electrode has a storage space for storing particulates collected therein, said collecting electrode further having openings communicating between the storage space and an inside of the high vacuum enclosure, said collecting electrode being provided adjacent the substrate been processed; an electric potential source for applying an electric potential of direct current or alternating current to the collecting electrode; and at least one particulate drawing electrode, which is insulated from said collecting electrode, for applying an electric potential higher than the electric potential of said collecting electrode, provided around said openings of said collecting electrode.