| 摘要 |
PROBLEM TO BE SOLVED: To provide a friction material for vibration wave motor which is superior in wear resistance and high in coefficient of friction, and enables stable driving. SOLUTION: The friction material is used in the frictional engagement portion of the vibrating body and/or the contact body of a vibration wave motor. The friction material is a metal, having a hardened layer on the surface thereof in contact with a mating material. An oxide film, containing Fe2 O3 , is formed on the surface of the hardened layer. |
