Patent ID: 9635467
Date: 2017-04-25
CPC Classifications: B06B,G10K,H01L,H04R

Claim:
1. An electroacoustic converter film, comprising: a piezoelectric laminate composed of a polymeric composite piezoelectric body in which piezoelectric body particles are dispersed in a viscoelastic matrix formed of a polymer material that exhibits viscoelasticity at normal temperature, an upper thin film electrode formed on one surface of the polymeric composite piezoelectric body and having an area equal to or smaller than that of the polymeric composite piezoelectric body, an upper protective layer formed on a surface of the upper thin film electrode and having an area equal to or greater than that of the upper thin film electrode, a lower thin film electrode formed on a surface of the polymeric composite piezoelectric body opposite to the upper thin film electrode and having an area equal to or smaller than the polymeric composite piezoelectric body, and a lower protective layer formed on a surface of the lower thin film electrode and having an area equal to or greater than that of the lower thin film electrode; a lead-out metal foil for upper electrode which is laminated on a portion of the upper thin film electrode, and of which at least a portion is located on an outside of the polymeric composite piezoelectric body in a surface direction; and a lead-out metal foil for lower electrode which is laminated on a portion of the lower thin film electrode, and of which at least a portion is located on an outside of the polymeric composite piezoelectric body in a surface direction, wherein the electroacoustic converter film includes an insulating layer which is provided between the upper thin film electrode or further the lead-out metal foil for upper electrode and the polymeric composite piezoelectric body, and of which a portion protrudes from an end portion of the polymeric composite piezoelectric body in a surface direction.