| 摘要 |
PROBLEM TO BE SOLVED: To exhibit lubricating effect excellent in running performance, wear resistance and durability under various use conditions by forming a carbon film on a magnetic layer and holding a triester having 3 long chain hydrocarbon groups as a lubricant. SOLUTION: The triester having 3 long chain hydrocarbon groups is one of hidrocarbons expressed by formula I (each of R1, R2, R3, R4, R5, R6 and R7 is a hydrophobic group) and formula II (each of l, m, n, p, r and s is 0-28 and q is 0-10). When the triester having 3 long chain hydrocarbon groups is applied on the carbon film as the lubricant, a lubricating film is formed by the adsorption of an ester of a polar group part of the lubricant molecule on the carbon film and the cohesive power between the long chain hydrocarbon groups of the hydrophobic group part. Friction coefficient is lowered and shuttle durability and still durability are improved by the strong adsorption of the ester on the surface of the carbon film. |
