Patent ID: 7141516

Claim:
A high-frequency plasma generating apparatus having a reaction chamber in which a ground electrode is disposed and a discharge electrode is disposed opposite to the ground electrode, so that a substrate as a processing object will be placed in close contact with the ground electrode, and a high-frequency voltage will be applied to the discharge electrode so as to generate plasma between the ground electrode and the discharge electrode, the high-frequency plasma generating apparatus comprising: a first high-frequency generator which generates a first high-frequency voltage, a first electric power feeder which applies the first high-frequency voltage to a feeding point disposed on a lateral portion of the discharge electrode, a second high-frequency generator which generates a second high-frequency voltage, and a second electric power feeder which applies the second high-frequency voltage to a feeding point disposed on another lateral portion of the discharge electrode, wherein the second high-frequency voltage has the same frequency as that of the first high-frequency voltage and has a phase which varies with a low-frequency signal, which is modulated by a predetermined modulation signal.