Patent ID: 7700164

Claim:
A method for forming a film comprising the steps of: disposing a substrate, facing a plurality of plasma generating apparatuses, wherein each of the plasma generating apparatuses includes; a first cylindrical electrode surrounding a hollow portion, a central axis of the first cylindrical electrode being perpendicular to a surface of the substrate; a cylindrical insulator surrounding the first cylindrical electrode with a gap portion interposed therebetween; a second cylindrical electrode surrounding the cylindrical insulator, supplying a material gas into the hollow portion; supplying a rare gas into the gap portion; generating a discharge between the first cylindrical electrode and the second cylindrical electrode to activate the rare gas; generating a plasma including the rare gas in the gap portion; mixing the plasma and the material gas outside of the plurality of plasma generating apparatuses; and spraying the plasma and the material gas to the substrate to form a hard carbon film on the substrate, wherein the plasma generating apparatuses are provided staggered to the substrate, and wherein the plasma is generated in a pressure range of 5 to 760 Torr.