Piezoelectric speaker having weight and method of producing the same
First Claim
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, andwherein 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.
1 Assignment
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Accused Products
Abstract
The present disclosure relates to a piezoelectric speaker having a weight that enables a frequency response characteristic of the piezoelectric speaker to be uniform by disposing a weight of a flexible material on an acoustic diaphragm or on and below an acoustic diaphragm of the piezoelectric speaker, thereby enhancing flatness of sound. The piezoelectric speaker having the weight includes a piezoelectric device having a piezoelectric layer and an electrode formed on 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 bonded on one surface of the piezoelectric device; a frame disposed in a form that surrounds a side surface of the acoustic diaphragm; and a weight disposed above the acoustic diaphragm or above and below the acoustic diaphragm on which the piezoelectric device is disposed to thereby control a vibration.
17 Citations
20 Claims
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1. A piezoelectric speaker, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 11, 12, 13, 14, 15)
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7. A piezoelectric speaker, comprising:
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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; and one or more lower weights disposed below the acoustic diaphragm, 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, 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, and wherein the acoustic diaphragm includes a nano-composite material that is formed by synthesizing a polymer and a nano structure material. - View Dependent Claims (10, 19)
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16. A method of producing a piezoelectric speaker, the method comprising:
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forming a piezoelectric device; forming an acoustic diaphragm; bonding the piezoelectric device on the acoustic diaphragm using a high elastic damping material; disposing one or more upper weights of a flexible material above the acoustic diaphragm on which the piezoelectric device is bonded along a central portion of the acoustic diaphragm in a long shaft direction of the acoustic diaphragm; disposing one or more lower weights below the acoustic diaphragm on which the piezoelectric device is disposed; and disposing a frame in a form that surrounds a side surface of the acoustic diaphragm, wherein the one or more lower weights are disposed not to overlap a position of the one or more upper weights lengthwise, wherein forming the acoustic diaphragm includes; forming a first acoustic diaphragm that is flexible; and forming a second acoustic diaphragm on the first acoustic diaphragm, the second acoustic diaphragm being rigid, wherein the first acoustic diaphragm has a young'"'"'s modulus lower than the second acoustic diaphragm, and wherein the first acoustic diaphragm is attached to the frame. - View Dependent Claims (17, 18, 20)
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Specification