Piezoelectric speaker and piezoelectric speaker array

摘要

A piezoelectric speaker is a piezoelectric speaker which radiates acoustic waves by vibrating according to an applied voltage, including (i) a substrate which includes a first region having first bending stiffness against bending of a plane perpendicular to a vibration direction and a second region having second bending stiffness against bending of the perpendicular plane, the second bending stiffness being different from the first bending stiffness, (ii) a first piezoelectric element which is mounted on the first region and to which a voltage of a first frequency band is applied, and (iii) a second piezoelectric element which is mounted on the second region and to which a voltage of a second frequency band different from the first frequency band is applied.

主权项

1. A piezoelectric speaker which radiates acoustic waves by vibrating according to an applied voltage, said piezoelectric speaker comprising:
a substrate which includes (i) a first region having first bending stiffness against bending of a plane perpendicular to a vibration direction and (ii) a second region having second bending stiffness against bending of the perpendicular plane, the second bending stiffness being different from the first bending stiffness; a first piezoelectric element which is mounted on said first region and to which a voltage of a first frequency band is applied; and a second piezoelectric element which is mounted on said second region and to which a voltage of a second frequency band different from the first frequency band is applied, wherein said substrate is made of a plurality of laminated plate materials, and a thickness of said substrate in said first region is different from a thickness of said substrate in said second region.