Patent ID: 7755252

Claim:
A driving device comprising: an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction; a stationary member coupled to the first end portion of said electro-mechanical transducer; a vibration friction portion mounted to the second end portion of said electro-mechanical transducer, said vibration friction portion having a V-shaped groove in cross section; a rod-shaped moving portion frictionally coupled to said vibration friction portion, said rod-shaped moving portion being movable in the expansion/contraction direction of said electro-mechanical transducer; and an urging arrangement, fixed to said vibration friction portion, for urging said rod-shaped moving portion against said vibration friction portion at the V-shaped groove thereof, wherein said stationary member consists essentially of a base alloy which consists of, by weight, 88 to 97% tungsten, 2 to 11% nickel as a binder, and, as the balance, 0.1 to 2% of at least one metal having an ionization tendency which is higher than that of tungsten, said stationary member having a surface without nickel plating.