Electroacoustic transduction film and manufacturing method thereof, electroacoustic transducer, flexible display, vocal cord microphone, sensor for musical instrument
Provided are an electroacoustic transduction film capable of reproducing a sound with a sufficient sound volume at a high conversion efficiency, a manufacturing method thereof, an electroacoustic transducer, a flexible display, a vocal cord microphone, and a sensor for a musical instrument. The electroacoustic transduction film includes: a polymer composite piezoelectric body in which piezoelectric body particles are dispersed in a viscoelastic matrix formed of a polymer material having viscoelasticity at a normal temperature; two thin film electrodes laminated on both surfaces of the polymer composite piezoelectric body; and two protective layers respectively laminated on the two thin film electrodes, in which an intensity ratio α 1 =(002) plane peak intensity/((002) plane peak intensity+(200) plane peak intensity) between a (002) plane peak intensity and a (200) plane peak intensity derived from the piezoelectric body particles in a case where the polymer composite piezoelectric body is evaluated by an X-ray diffraction method is more than or equal to 0.6 and less than 1.
1. An electroacoustic transduction film comprising:
a polymer composite piezoelectric body in which piezoelectric body particles are dispersed in a viscoelastic matrix formed of a polymer material having viscoelasticity at a normal temperature;
two thin film electrodes laminated on both surfaces of the polymer composite piezoelectric body; and
two protective layers respectively laminated on the two thin film electrodes,
wherein the polymer material has a cyanoethyl group; and
an intensity ratio α 1 =(002) plane peak intensity/((002) plane peak intensity+(200) plane peak intensity) between a (002) plane peak intensity and a (200) plane peak intensity derived from the piezoelectric body particles in a case where the polymer composite piezoelectric body is evaluated by an X-ray diffraction method is more than or equal to 0.6 and less than 1.
2. The electroacoustic transduction film according to claim 1 ,
wherein the intensity ratio α 1 is more than or equal to 0.67 and less than or equal to 0.75.
3. The electroacoustic transduction film according to claim 1 ,
wherein the polymer material is cyanoethylated polyvinyl alcohol.
4. The electroacoustic transduction film according to claim 2 ,
wherein the polymer material is cyanoethylated polyvinyl alcohol.
5. The electroacoustic transduction film according to claim 4 ,
wherein the piezoelectric body particles are formed of ceramics particles having a perovskite type or wurtzite type crystal structure.
6. The electroacoustic transduction film according to claim 5 ,
wherein the piezoelectric body particles are formed of ceramics particles having at least one of lead zirconate titanate (PZT), lead lanthanum zirconate titanate (PLZT), barium titanate (BaTiO 3 ), zinc oxide (ZnO), and a solid solution (BFBT) of barium titanate and bismuth ferrite (BiFe 3 ).
7. The electroacoustic transduction film according to claim 1 ,
wherein the piezoelectric body particles are formed of ceramics particles having a perovskite type or wurtzite type crystal structure.
8. The electroacoustic transduction film according to claim 1 ,
wherein the piezoelectric body particles are formed of ceramics particles having at least one of lead zirconate titanate (PZT), lead lanthanum zirconate titanate (PLZT), barium titanate (BaTiO 3 ), zinc oxide (ZnO), and a solid solution (BFBT) of barium titanate and bismuth ferrite (BiFe 3 ).
9. An electroacoustic transducer comprising:
the electroacoustic transduction film according to claim 1 .
10. A flexible display comprising:
the electroacoustic transduction film according to claim 1 attached to a surface of the flexible display having flexibility, the surface being opposite to an image display surface.
11. A vocal cord microphone comprising:
the electroacoustic transduction film according to claim 1 used as a sensor.
12. A sensor for a musical instrument comprising:
the electroacoustic transduction film according to claim 1 used as a sensor.