Patent ID: 6189481
Filing Date: 2001-02-20
Classification: H01J

Abstract:
A microwave plasma processing apparatus for producing plasma from processing gas by a microwave and processing an object by said plasma, said apparatus comprising:a housing defining a processing chamber for accommodating the object;a first flat electrode disposed in said processing chamber to be loaded with the object;a second flat electrode parallel to said first flat electrode and formed with a plurality of radiation ports for radiating a microwave into said processing chamber; andmeans for changing respective areas of said plurality of radiation ports of said second electrode, wherein said means for changing comprises:a plurality of shutters; anda plurality of operating members for independently controlling respective positions of said plurality of shutters from outside the processing chamber; andwherein said plurality of radiation ports and said plurality of shutters are arranged in concentric circles around a center of said second electrode, and wherein the shutters arranged in one of the concentric circles are separately operable from the shutters arranged in the other concentric circles.