| 摘要 |
PURPOSE:To form a linear motor which utilizes supersonic wave by combining an elastic unit vibrated by a piezoelectric unit and an elastic unit for moving a movable element via a coupler or a resonator, and equalizing a mechanical impedance at the coupling point. CONSTITUTION:Piezoelectric units 4A, 4B are provided on both side surfaces of a metal elastic unit 2, high frequency voltage by supersonic wave is displaced by 90 deg. or 120 deg. of phase, and applied to form a surface wave combined with lateral and longitudinal vibrations on the surface. An elastic unit 1 for moving a movable element 8 is provided, coupled to an elastic unit 2 via a coupler 3 or a resonator 5, the distance is set to the phase difference of 1/4 of wavelength to cancel the reflecting wave, the mechanical impedance at the coupling point is equalized to transmit the vibrating energy of the unit 2 to the unit 1. Therefore, one traveling wave is generated at the unit 1, and the element 8 is linearly moved by the bending vibration of the unit 1. |
