Electroacoustic conversion film, electroacoustic converter, flexible display, and projector screen

摘要

The present invention provides an electroacoustic conversion film comprising: a polymeric composite piezoelectric body in which piezoelectric body particles are dispersed in a viscoelastic matrix formed of a polymer material exhibiting viscoelasticity at normal temperature; and two or more electrode pairs, wherein one electrode and the other electrode of each of the electrode pairs are arranged on two opposite main surfaces of the polymeric composite piezoelectric body, respectively, to interpose the polymeric composite piezoelectric body therebetween, and thereby each of the electrode pairs forms an active region.

主权项

1. An electroacoustic conversion film, comprising:
a polymeric composite piezoelectric body in which piezoelectric body particles are dispersed in a viscoelastic matrix formed of a polymer material exhibiting viscoelasticity at normal temperature; and two or more electrode pairs, wherein one electrode and the other electrode of each of the electrode pairs are arranged on two opposite main surfaces of the polymeric composite piezoelectric body, respectively, to interpose the polymeric composite piezoelectric body therebetween, and thereby each of the electrode pairs forms an active region, wherein the maximum value of the loss tangent (Tan δ) at a frequency of 1 Hz of the electroacoustic conversion film, that is 0.1 or higher and is obtained by dynamic viscoelasticity measurement, is present in a temperature range of 0° C. to 50° C.; and a storage elastic modulus (E′) at a frequency of 1 Hz, of the electroacoustic conversion film, that is obtained by the dynamic viscoelasticity measurement, is 10 GPa to 30 GPa at 0° C. and 1 GPa to 10 GPa at 50° C.