Patent ID: 9241397
Filing Date: 2016-01-19
CPC Classification: H01J,H05H

Claim Text:
1. A microwave plasma processing apparatus comprising: a processing container configured to define a processing space; a microwave generator configured to generate microwaves for generating plasma of a processing gas introduced into the processing space; a distributor configured to distribute the microwaves to a plurality of waveguides using a variable distribution ratio; an antenna installed in the processing container to seal the processing space and configured to radiate the microwaves distributed to each of the plurality of waveguides by the distributor to the processing space; a monitor unit configured to monitor a power of the microwaves distributed to each of the plurality of waveguides by the distributor; and a distribution ratio control unit configured to correct the distribution ratio used for distribution of the microwaves by the distributor based on a difference between a ratio of the power of the microwaves monitored by the monitor unit and a previously designated distribution ratio, wherein the distributor includes a movable member and distributes the microwaves to the plurality of waveguides according to a position of the movable member, and the distribution ratio control unit adjusts the position of the movable member to make the difference closer to 0 (zero) so as to correct the distribution ratio used for distribution of the microwaves by the distributor.