| 摘要 |
PURPOSE:To drive an ultrasonic motor without wear by using a horn type ultrasonic piezoelectric vibrator provided with a ringlike disc, and combining the end face of the disc and a driven element. CONSTITUTION:A horn type ultrasonic piezoelectric vibrator 10 is composed by mounting a disc 7 at the end of a conical horn body 6, securing a support 8 to the node of the body 6, and further mounting a piezoelectric vibrator 9 on the base of the body 6. When a resonance frequency AC electric field is applied to the vibrator 9, the vibrator 10 transmits a thicknesswise vibration to the disc 7 provided at the end by the body 6. The disc 7 generates a traveling wave at the end face 7a by the combination of the thicknesswise vibration and an external vibration. As a result, a driven member 12 can be rotatably driven by the combination of the end face 7a and, for example, the member 12 made of a rotor supported by a rotary shaft 11. |
