Patent ID: 8652587

Claim:
A method of forming a film on a surface of a conductive substrate with a long shape using an apparatus through plasma-enhanced chemical vapor deposition, the apparatus comprising: a chamber, a pair of rotary electrode reels disposed in the chamber and including a feed-out reel and a take-up reel, a plasma source able to apply voltage using the chamber as an anode and the rotary electrode reels as a cathode, a material gas supplier for supplying a material gas for a film into the chamber, and an exhaust unit for vacuum-evacuating an inside of the chamber, the method comprising: vacuum-evacuating the inside of the chamber with the exhaust unit, and supplying the material gas into the chamber with the material gas supplier, wherein: when the conductive substrate with a cylindrical shape wound on the feed-out reel is defined as a feed-out substrate portion, the conductive substrate with a cylindrical shape wound on the take-up reel is defined as a take-up substrate portion, and the conductive substrate positioned between the feed-out reel and the take-up reel is defined as a substrate portion between reels, a negative voltage is applied to the rotary electrode reels from the plasma source while the conductive substrate is fed-out from the feed-out reel and is wound on the take-up reel so that an entire surface of the substrate portion between reels contacts the material gas, whereby a plasma sheath is formed along the surface of the substrate portion between reels and the material gas is activated in the plasma sheath and thus contacts the surface of the substrate, thus forming the film on the surface of the substrate.