Patent ID: 6253703
Filing Date: 2001-07-03
Classification: C23C,H01J

Abstract:
A microwave plasma CVD apparatus comprising:(a) a hermetically sealed vacuum vessel;(b) raw material gas introducing means for introducing a raw material gas into said vacuum vessel;(c) evacuating means for evacuating said vacuum vessel; and(d) microwave introducing means for introducing microwaves through a microwave transmission circuit into said vacuum vessel to generate a plasma within said vacuum vessel, characterized in that said microwave transmission circuit includes a waveguide with a rectangular cross-section and a cavity resonator with a cylindrical cross-section, said cavity resonator contains(i) a microwave reflector comprising a perforated plate, said perforated plate being plated with a metal selected from the group consisting of silver, copper and gold; and(ii) a slidable plunger with trailing spring contacts for varying the length of the inside thereof between said plunger and said microwave reflector and at least the inside of said cavity resonator which is in contact with said trailing spring contacts is constituted of a metal selected from the group consisting of silver-plated metal, copper-plated metal and gold-plated metal.