Patent ID: 8956499
Filing Date: 2015-02-17
Classification: H01J

Abstract:
1. A plasma processing device for executing plasma processing for an object to be processed that is accommodated in a processing chamber, comprising: a vacuum chamber forming the processing chamber; an electrode portion arranged in the processing chamber; a vacuum exhaust portion exhausting gas from the processing chamber by vacuum; a gas supply portion supplying gas used for generating plasma into the processing chamber; a high frequency power supply portion generating plasma discharge in the processing chamber when a high frequency voltage is impressed upon the electrode portion; a matching device matching impedance of a plasma discharge circuit for generating plasma discharge with impedance of the high frequency power supply portion; a plasma discharge state monitoring unit monitoring a plasma discharge state in the processing chamber, the plasma discharge state monitoring unit including: a first counting portion receiving the first detection signal and counting the number of times of the detection of the electric potential change wave-form made by the first wave-form detecting portion so as to hold a first counted value; a discharge state judging portion judging a state of the plasma discharge according to the first counted value of the first counting portion; a second counting portion receiving the second detection signal and counting the number of times of the detection of the electric potential change wave-form made by the second wave-form detecting portion so as to hold a second counted value; and a maintenance judging portion judging whether or not the maintenance of the vacuum chamber is needed according to the second counted value of the second counting portion.