Patent ID: 8551414

Claim:
A high-voltage plasma generating apparatus for generating plasma using high voltage of 10 2 -10 5 V, comprising: a first electrode which receives, as electric power, feeding of an alternating-current signal including a signal component of a predetermined frequency from an electric feeding point, to generate high voltage due to resonance which is occurred upon the feeding of the alternating-current signal, a second electrode which is grounded and spaced away from the first electrode and encloses the first electrode, to define a space around the first electrode, and a control device configured to adjust an alternating-current signal including a signal component of a frequency which is identical to a resonance frequency of the first electrode, to be fed to the first electrode, and wherein the control device includes: an electric field probe which measures intensity of an electric field to be generated in the space between the first electrode and the second electrode; a filter which filters a measurement signal outputted from the electric field probe, to obtain an alternating-current signal of a band of the predetermined frequency; a variable phase shifter which shifts a phase of the alternating-current signal to synchronize the alternating-current signal to the resonance of the electric field to be generated in the space when the alternating-current signal is fed to the first electrode as the electric power; and an amplifier which amplifies the phase-shifted alternating-current signal, wherein the measurement signal outputted from the electric field probe is supplied through in an order of the filter, the variable phase shifter, and the amplifier to the first electrode as the electric power.