Patent ID: 8397668

Claim:
A plasma processing apparatus comprising: a processing chamber, an antenna for irradiating electromagnetic waves in the processing chamber, a shower plate for feeding processing gas into the processing chamber, a gas dispersion plate for dispersing the gas fed to the shower plate, a gas supply means for feeding processing gas to the gas dispersion plate, an evacuation means for decompressing the processing chamber, an electrode on which an object to be processed is placed, and an electromagnetic radiation power supply for supplying RF power to the antenna; wherein: the gas dispersion plate is divided into an inner area and an outer area, the gas supply means includes a first gas supply source; a second gas supply source; a first gas flow controller for controlling a flow rate of a gas supplied from the first gas supply source; a second gas flow controller for controlling a flow rate of a gas supplied from the second gas supply source; a first gas distribution means for branching a gas supplied from the first gas flow controller at a predetermined gas flow ratio; a second gas distribution means for branching a gas supplied from the second gas flow controller at a predetermined gas flow ratio; a first junction portion in which one gas branched at the predetermined gas flow ratio via the first gas distribution means and one gas branched at the predetermined gas flow ratio via the second gas distribution means join together; a second junction portion in which the other gas branched at the predetermined gas flow ratio via the first gas distribution means and the other gas branched at the predetermined gas flow ratio via the second gas distribution means join together; a first gas pipe for supplying a gas from the first junction portion to the inner area of the gas dispersion plate; and a second gas pipe for supplying a gas from the second junction portion to the outer area of the gas dispersion plate, and wherein the shower plate has a first gas outlet which supplies a gas supplied from the inner area of the gas dispersion plate into the processing chamber and which is arranged in the inner area of the shower plate, and a second gas outlet which supplies a gas supplied from the outer area of the gas dispersion plate into the processing chamber and which is arranged in the outer area of the shower plate.