Patent ID: 8865269
Filing Date: 2014-10-21
Classification: G11B

Abstract:
1. A method of forming a protective film comprising the following steps in order: forming a protective film on a lamination, the lamination including a substrate and a metallic film layer formed on the substrate, by means of a plasma CVD method using a raw material of a hydrocarbon gas, and performing a two-step surface treatment on the protective film, consisting of: a first surface treatment on the protective film after the supply of the hydrocarbon gas is stopped, wherein the first surface treatment includes a plasma treatment with argon gas alone, and then a second surface treatment, wherein the second surface treatment is a plasma treatment with a gas containing either nitrogen gas alone or a mixture of nitrogen gas and an inert gas, wherein the second surface treatment is carried out by a second plasma CVD device that is separate from the CVD device used in the formation of the protective film, and wherein a lubricant layer is deposited after the second surface treatment, without an intervening plasma treatment and wherein the second surface treatment makes a nitrogen bond to the outermost surface of the protective film to achieve good bonding between the protective film and the lubricant film.