Patent ID: 9633821
Date: 2017-04-25
CPC Classifications: H01J

Claim:
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; an antenna installed in the processing container to seal the processing space, and to radiate the microwaves distributed to the plurality of waveguides by the distributor, to the processing space; a monitor unit configured to monitor a voltage of each of the plurality of waveguides; a storage unit configured to store a difference between a monitor value of the voltage monitored by the monitor unit and a predetermined reference value of the voltage and a control value of a distribution ratio of the distributor corresponding to the difference; and a control unit configured to acquire the control value of the distribution ratio of the distributor, which corresponds to the difference between the monitor value of the voltage monitored by the monitor unit and the predetermined reference value of the voltage, from the storage unit when the monitor value of the voltage monitored by the monitor unit is changed and to control the distribution ratio of the distributor based on the acquired control value thereby distributing the microwaves to the plurality of waveguides of the antenna.