| 摘要 |
PURPOSE:To facilitate manufacture and reduce the cost, by forming a disc- formed piezoelectric oscillator provided with a notched section on a part of the side surface, and by applying an AC field in the direction of the thickness to generate a traveling wave. CONSTITUTION:A disc-formed piezoelectric oscillator 4 is provided with the notched section 5 of a notched part on the side surface, and on both the surfaces, electrodes 6-7 are respectively arranged, and polarization is performed in the direction of the thickness. When the AC field of specified frequency is applied to the oscillator 4 from an oscillating unit, then traveling waves in the directions A(B) of arrow heads are generated on the surface of the notched section 5. An ultrasonic wave driving gear is composed of said oscillator 4, and the driven unit 11 of a rotary body supporting a rotary shaft on one side of the notched section 5 with a bearing or the like. Then, the driven unit 11 can be rotated in the forward or reverse direction. |
