Patent ID: 7587989

Claim:
A parallel plate plasma CVD processing apparatus having a discharge space having provided therein a cathode electrode and a grounding electrode opposed to the cathode electrode, for introducing a gas into the discharge space, converting the gas into a plasma by a high frequency power and depositing a film on a surface of the grounding electrode facing the cathode electrode, the apparatus comprising: at least one conductor plate provided on a back side of the cathode electrode and d.c. potentially insulated from the cathode electrode and the grounding electrode; a shielding wall for enclosing the cathode electrode and the conductor plate; a discharge space defined by the shielding wall and the grounding electrode and configured such that an electrode coupling capacitance ratio of (i) an inter-electrode coupling capacitance provided by the cathode electrode and the grounding electrode to (ii) a coupling capacitance provided by the cathode electrode and a bottom surface of the shielding wall on the back side of the conductor plate is 1/3 or more, said grounding electrode supporting a rear surface of the deposited film; power supply means for supplying a high frequency power with a pulse modulation directly to the cathode electrode to convert the gas into a plasma; pulse modulation means for setting a modulation frequency of the pulse modulation to 50 Hz to 100 KHz; and means for setting a percentage (duty) of a high frequency application time to a period of a modulation frequency of the pulse modulation within a range of 15% to 60%, wherein the apparatus is configured such that a high frequency power of a frequency of 30 MHz to 150 MHz is supplied as the high frequency power from a high frequency power source.