Patent ID: 9343270
Filing Date: 2016-05-17
CPC Classification: H01J

Claim Text:
1. A plasma processing apparatus comprising: a processing chamber configured to partition a processing space; a microwave generator configured to generate microwaves for plasma excitation; a dielectric member mounted in the processing chamber so as to seal the processing space, and configured to introduce the microwaves generated by the microwave generator into the processing space; an injector made of conductive material and mounted along a central axis in the dielectric member, and further configured to supply a processing gas to the processing space through a through-hole formed in the dielectric member; and a waveguide plate made of a dielectric material and mounted in the injector, and configured to guide the microwaves propagated into the dielectric member toward the through-hole, to an inside of the injector, wherein the dielectric member is provided with a receiving concave part which is formed on a surface opposite to a surface sealing the processing space of the dielectric member to receive the injector, the receiving concave part is disposed above the through-hole through which the receiving concave part is communicated with the processing space, the receiving concave part provided with a first annular groove part to surround the through-hole, the injector is provided with a body part including an additional through-hole for supplying the processing gas to the through-hole of the dielctric member and a protruding part which protrudes from the body part into the first annular groove part of the receiving concave part; and the waveguide plate is buried in the protruding part of the injector to be disposed inside the injector so as to surround the through-hole of the dielectric member.