| 摘要 |
PURPOSE: A piezoelectric actuator is provided to improve efficiency, and to perform longitudinal vibrations and which is acted upon by elastic means. CONSTITUTION: The piezoelectric actuator is to drive a movable part(2) having an elongate piezoelectric resonator(3), which serves to perform longitudinal vibrations and which is acted upon by elastic means(10), for example a spring(10). The elastic means(10) acts upon the piezoelectric resonator(3) mainly in the longitudinal direction(11) and serves to exert a force on the resonator(3) in a direction towards the movable part(2), the resonant frequency of the elastic means(10) being substantially smaller than the resonant frequency of the piezoelectric resonator(3), and the piezoelectric resonator(3) is guided by at least one guide element(4, 5) in a direction perpendicular to its longitudinal direction(11). This enables the resonator(3) to vibrate as freely as possible, which leads to a higher efficiency.
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