Patent ID: 6503579
Filing Date: 2003-01-07
Classification: C23C,H01J

Abstract:
A plasma CVD method for forming a plasma from a deposition material gas by supplying an electric power to said gas, and forming a film on an outer surface of a hollow object having an opening under said plasma, whereinan internal electrode to be arranged in an inner space of said hollow object and an external electrode to be arranged outside said object are prepared as electrodes for supplying said electric power for forming the plasma, said internal electrode including a central rod member, a predetermined number of closable members arranged around the central rod member with a predetermined angular space between each of the closable members and each having an end rotatably connected to a predetermined portion of the central rod member and the other end rotatably connected to a ring member slidably fitted around the central rod member in a closable fashion, and a drive portion including a drive member coupled to a central rod member for sliding the ring member on the central rod member and being capable of sliding the ring member to close the closable members for attaining a reduced form allowing passage of said internal electrode through said opening of said hollow object, and to open the closable members for attaining an enlarged form predetermined in accordance with a volume and a shape of the inner space of said object, said internal electrode is closed to attain said reduced form by the operation of said drive portion and is inserted into the inner space of said object through said opening of said object before forming the film on said outer surface of said object, then is changed into said enlarged form by the operation of said drive portion and is kept within said object, and said electric power for forming the gas plasma is supplied across said internal electrode and said external electrode for forming the film on the outer surface of said object.