Piezoelectric film

Abstract

Provided is a piezoelectric film capable of realizing a piezoelectric speaker in which a high sound pressure is obtained, a sufficient sound pressure characteristic is obtained in a wide frequency band, and generation of a chattering sound particularly in a low sound can be suppressed. The piezoelectric film is a piezoelectric film including a polymer-based piezoelectric composite material which contains piezoelectric particles in a matrix containing a polymer material, and electrode layers which are laminated on both surfaces of the polymer-based piezoelectric composite material, in which a variation coefficient of a destructive force of a laminate having the polymer-based piezoelectric composite material and the electrode layers in a plane direction is 0.25 or less.

Dependencies are inferred from the claim text.