PIEZOELECTRIC ACTUATOR AND ELECTRONIC APPARATUS

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. SOLUTION: The piezoelectric actuator includes a piezoelectric element 1 wherein at least two surfaces facing each other are exp...

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Bibliographische Detailangaben
Hauptverfasser:	SAKAI HIROSHI, SHINODA SHIGEKI, SASAKI YASUHIRO, ONISHI YASUHARU, TAKAHASHI NAOTAKE
Format:	Patent
Sprache:	eng
Schlagworte:	CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR ELECTRICITY GENERATION LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS PUBLIC ADDRESS SYSTEMS
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Beschreibung
Zusammenfassung:	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. 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. COPYRIGHT: (C)2011,JPO&INPIT