| 摘要 |
<p>A driving device (20) includes an electro-mechanical transducer (441) having first and second end portions (441, 441 b) opposite to each other in an expansion/contraction direction, a stationary member (442) coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion (443) coupled to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion (423) frictionally coupled to the vibration friction portion, whereby moving the moving portion (423) in the expansion/contraction direction of the electro-mechanical transducer (441).
The stationary member (442) consists essentially of a base alloy which consists of, by weight, 88 to 97% tungsten (W), 2 to 11 % nickel (Ni) as a binder, and, as the balance, 0.1 to 2% at least one metal having an ionization tendency which is higher than that of tungsten (W). The stationary member (442) has a surface without nickel plating.</p> |
