Patent ID: 6313583
Filing Date: 2001-11-06
Classification: H01J

Abstract:
A plasma processing apparatus in which a plasma generating gas is introduced into an evacuated vacuum chamber and a high-frequency voltage is applied to a discharging electrode provided in said vacuum chamber to generate a plasma in said vacuum chamber, thereby performing a plasma processing for an object of processing placed on said discharging electrode, the apparatus comprising:a high-frequency power supply unit for applying the high-frequency voltage to said discharging electrode,a matching unit for taking the matching in impedance between said high-frequency power supply unit and a discharging circuit which produces a plasma discharge,detection means for detecting an impedance of said discharging circuit by detecting at least one of voltage and current of a resistor connected between said matching unit and said discharging electrode, andcontrol means for controlling said high-frequency power supply unit an the basis of the result of detection by said detection means.