Piezoelectric Speaker

摘要

The present invention relates to a piezoelectric speaker which includes an amplitude control plate and forms a frame with a metal material to properly control amplitude of a sound diaphragm while increasing a sound pressure. The piezoelectric speaker comprises a sound diaphragm; a pair of frames attached around the upper surface and the lower surface of the sound diaphragm; a piezoelectric layer attached on the upper surface of the sound diaphragm, and converting an applied electric signal into vibration to output a sound; and a lower amplitude control plate attached on the lower surface of the sound diaphragm, and made of a synthetic resin material, wherein the sound diaphragm is made of a synthetic resin or a paper material, and the frames are made of a metal material.