ELECTROACOUSTIC CONVERSION FILM, METHOD FOR PRODUCING SAME, ELECTROACOUSTIC TRANSDUCER, FLEXIBLE DISPLAY, VOCAL CORD MICROPHONE AND SENSOR FOR MUSICAL INSTRUMENTS

摘要

Provided are: an electroacoustic conversion film which has high conversion efficiency and is capable of reproduction with a sufficient sound volume; a method for producing this electroacoustic conversion film; an electroacoustic transducer; a flexible display; a vocal cord microphone; and a sensor for musical instruments. This electroacoustic conversion film comprises: a polymer composite piezoelectric body which is obtained by dispersing piezoelectric particles in a viscoelastic matrix that is formed of a polymer material which has viscoelasticity at room temperature; two thin film electrodes which are respectively laminated on both surfaces of the polymer composite piezoelectric body; and two protective layers which are respectively laminated on the two thin film electrodes. The intensity ratio α1 of the peak intensity of the (002) plane and the peak intensity of the (200) plane ascribed to the piezoelectric particles as the polymer composite piezoelectric body is evaluated by an X-ray diffraction method, namely the intensity ratio α1 = (peak intensity of (002) plane)/( (peak intensity of (002) plane) + (peak intensity of (200) plane)) is 0.6 or more but less than 1.