US 2018/0160248 A1 · ELECTROACOUSTIC TRANSDUCTION FILM AND MANUFACTURING METHOD THEREOF, ELECTROACOUSTIC TRANSDUCER, FLEXIBLE DISPLAY, VOCAL CORD MICROPHONE, SENSOR FOR MUSICAL INSTRUMENT

Abstract

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 α1=(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.

Claims17

Dependent claims

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 α1=(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.

4 more elements

A manufacturing method of an electroacoustic transduction film including 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, the method comprising:

a preparation step of preparing electrode laminated bodies in each of which one of the thin film electrodes and one of the protective layers are laminated;
a first lamination step of producing a first laminated body by laminating one of the electrode laminated bodies and the polymer composite piezoelectric body;
an electric polarization processing step of performing electric polarization processing on the polymer composite piezoelectric body of the first laminated body;
a second lamination step of producing a second laminated body by laminating the other electrode laminated body on the surface of the polymer composite piezoelectric body on which no electrode laminated body is laminated;
and
a mechanical polarization processing step of performing mechanical polarization processing on the second laminated body.

3 more elements

Dependencies are inferred from the claim text.

Electroacoustic transduction film and manufacturing method thereof, electroacoustic transducer, flexible display, vocal cord microphone, sensor for musical instrument

Life of this patent

Electroacoustic transduction film and manufacturing method thereof, electroacoustic transducer, flexible display, vocal cord microphone, sensor for musical instrument

Life of this patent

Abstract

Claims17