| 摘要 |
An elastic body (43) formed from a crystalline resin is fixed to a piezoelectric element (42) for generating vibrations using the application of an AC voltage, is used in contact with a movable body (45), and flexurally vibrates owing to the vibrations of the piezoelectric element (42), thereby driving the movable body (45). Teeth (43b) may be formed on the opposite side of the elastic body (43) to the side on which the piezoelectric element (42) is fixed. The crystalline resin may be a polyaryl ketone resin or a polyphenylene sulfide resin. The piezoelectric actuator exhibits superior flexural vibration transmission properties. Furthermore, if a displacement enlargement element for a displacement enlargement piezoelectric actuator is formed from the crystalline resin, the displacement by the expansion and contraction of the piezoelectric element can be greatly enlarged. Moreover, if a resonance member of a Langevin transducer is formed from the crystalline resin, the surface thereof can rapidly be made to vibrate, even using a low current (or a low voltage). |
