Patent ID: 9621997
Date: 2017-04-11
CPC Classifications: H01L,H04R

Claim:
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; and electrode layers disposed to interpose the polymer composite piezoelectric body therebetween, wherein an area fraction of the piezoelectric body particles in a contact surface with respect to the electrode layer, which is calculated from data obtained by peeling off the electrode layer, by exposing the contact surface with respect to the electrode layer, and by imaging the contact surface with respect to the electrode layer, is less than or equal to 50%, and wherein in a surface of the polymer composite piezoelectric body facing the electrode layer, at least one of an arithmetic average roughness Ra of less than or equal to 1 μm, a maximum valley depth Rv of less than or equal to 6 μm, and a maximum height roughness Rz of less than or equal to 12 μm is satisfied.