ADDITIVE-FREE NON-STRETCHED PIEZOELECTRIC MATERIAL CONTAINING PVDF, AND PIEZOELECTRIC SENSOR

PROBLEM TO BE SOLVED: To obtain a piezoelectric material comprising polyvinylidene fluoride wherein contraction resulting from extension is minimized, and to provide a piezoelectric sensor using the piezoelectric material. SOLUTION: The piezoelectric material is obtained by subjecting vinylidene flu...

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Hauptverfasser:	MURAYAMA TOSHIMI, KITAMURA HIDEKI, MORIYAMA NOBUHIRO, SUZUKI KAZUMOTO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY GENERAL PROCESSES OF COMPOUNDING LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PUBLIC ADDRESS SYSTEMS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a piezoelectric material comprising polyvinylidene fluoride wherein contraction resulting from extension is minimized, and to provide a piezoelectric sensor using the piezoelectric material. SOLUTION: The piezoelectric material is obtained by subjecting vinylidene fluoride polymer having a nonpolar α-type crystal structure to additive-free non-stretched polarization. Since it is non-stretched, a piezoelectric material where contraction resulting from extension is minimized, and a piezoelectric sensor using the piezoelectric material can be obtained. The piezoelectric material has an electric field strength of 200-600 MV/m during polarization, and the polarized polymer includes a polar α-type crystal structure. COPYRIGHT: (C)2011,JPO&INPIT