| 摘要 |
PURPOSE:To reduce the cost of an ultrasonic motor by directly forming a piezoelectric element on an elastic unit by means of printing or coating to improve the operating efficiency. CONSTITUTION:An ultrasonic motor is composed of an elastic ring 1 for forming a vibrator, and a rotor 3 which becomes a moving unit in pressure contact with the surface 1A of the ring 1. A piezoelectric element 5 fixed to the ring 1 is supported to a vibration damper 7 supported to a stationary unit 9. In this case, the element 5 is secured to the ring 1 by a coating method, such as a screen printing, a doctor blade method or a roll coating method, etc. Then, it is polarized in a given manner. Thus, the element 5 is reduced in its thickness, and the motor can be rotated with a low voltage. Therefore, the motor is reduced in size as a whole. |
