| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piezoelectric actuator capable of obtaining a sound pressure equal to or higher than a predetermined level in a wide-area frequency band. <P>SOLUTION: The piezoelectric actuator includes a piezoelectric element 1 wherein at least two surfaces facing each other are expanded and contracted corresponding to the state of an electric field, a pedestal 2 with the piezoelectric element stuck to at least one surface, a vibrating membrane 3 connected with at least one surface of the pedestal, and a support member 4 connected with the vibrating membrane. The vibrating membrane is constituted of a material having a piezoelectric characteristics to be expanded and contracted in accordance with the state of the electric field. <P>COPYRIGHT: (C)2011,JPO&INPIT |
