Patent ID: 9445200
Filing Date: 2016-09-13
CPC Classification: H04R,Y10T

Claim Text:
1. A piezoelectric speaker, comprising: a piezoelectric device including a piezoelectric layer and one or more electrodes disposed on the piezoelectric layer or on and below the piezoelectric layer to apply an electrical signal to the piezoelectric layer; an acoustic diaphragm having a wider area than the piezoelectric device and disposed below the piezoelectric device; a frame disposed in a form that surrounds a side surface of the acoustic diaphragm; one or more upper weights disposed above the acoustic diaphragm on which the piezoelectric device is disposed; and one or more lower weights disposed below the acoustic diaphragm on which the piezoelectric device is disposed, wherein the one or more lower weights are disposed not to overlap a position of the one or more upper weights lengthwise, wherein the acoustic diaphragm includes a stacked structure of a first acoustic diaphragm and a second acoustic diaphragm, and wherein the first acoustic diaphragm is flexible and attached to the frame and has a young's modulus lower than the second acoustic diaphragm, and the second acoustic diaphragm is rigid and disposed on the first acoustic diaphragm.