| 摘要 |
PURPOSE:To obtain the flat temperature characteristic of output, by using the substance of the equal coefficient of linear expansion for the piezoelectric unit and the elastic unit organizing the stator of a motor. CONSTITUTION:Eight electrodes 1a are arranged by dividing the surface of the first disc-shaped piezoelectric transducer 1, and are polarized in different polarities in the direction of the disc thickness electrode by electrode. The second piezoelectric transducer 2 is also formed in the same way, and both piezoelectric transducers are put together so that the electrode transition of the second transducer 2 may be positioned near the center of the electrode of the first transducer 1. An elastic unit 3 forming a stator by fitting the transducers 1, 2 is provided with the projection 3a of an oscillation-transmitting member and with a central shaft 5, and a rotor 14 is fitted to organize an ultrasonic wave motor. In this case, the elastic unit 3 and the piezoelectric transducers 1, 2 are formed by using the substance of the equal coefficient of linear expansion. For example, for the elastic unit 3, the alloy of 42% nickel is used, and for the piezoelectric transducers 1, 2, the material of three- component system is used. As the result, the characteristic of flat temperature can be obtained. |
