# US 12,764,474 B2 · Vibration apparatus and vehicular apparatus comprising the same

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- Number: US 12,764,474 B2
- Document ID: US12764474B2
- Status: Granted
- Kind: B2
- Application number: 18/907,304
- Filed: 2024-10-04
- Published: 2025-04-10
- Granted: 2026-10-13
- Earliest claimed: 2023-10-06
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Yong-Su Ham; SeungRyull Park; Chiwan Kim
- Web page: https://patentgrep.com/patent/US12764474B2

## CPC

- H04R 17/00: Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00})
- H04R 1/023: {Screens for loudspeakers}
- H04R 2499/13: Acoustic transducers and sound field adaptation in vehicles
- H04R 2499/15: Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)

## Abstract

A vibration apparatus can include a vibration member, and a vibration element configured to vibrate the vibration member and including a vibration part. The vibration part includes a piezoelectric material and an electrostrictive material. The electrostrictive material includes materials represented by Equations 1 and 2 below. (PbA-BCB)(Mg1/3Nb2/3)aO3 [Equation 1] (PbA-BCB)(D1/3E2/3)bO3 [Equation 2]

## Claims

### Claim 1

A vibration apparatus comprising:
a vibration member; and
a vibration element configured to vibrate the vibration member, and including a vibration part,
wherein the vibration part includes a piezoelectric material and an electrostrictive material,
wherein the electrostrictive material includes materials represented by Equations 1 and 2 below:
(PbA-BCB)(Mg1/3Nb2/3)aO3 [Equation 1]
(PbA-BCB)(D1/3E2/3)bO3, [Equation 2]
wherein the piezoelectric material includes materials represented by Equations 3 and 4 below:
(PbA-BCB)(Zrc)O3 [Equation 3]
(PbA-BCB)(Tid)O3, [Equation 4]
where in Equation 1 to Equation 4, ‘C’ is one of calcium Ca, strontium Sr, and barium Ba, ‘D’ is one of nickel Ni, manganese Mn, magnesium Mg, and cobalt Co, ‘E’ is niobium Nb or tantalum Ta, and
where in Equation 1 to Equation 4, 0.02≤B≤0.20, 0.80≤A-B≤0.98, ‘a+b+c+d’ is equal to 1, and a ratio of ‘a+b’ and ‘c+d’ is 1.0:1.7 to 1.0:3.0
wherein the vibration element includes a cover member comprising:
a first cover member covering a first surface of the vibration part and a second cover member covering a second surface of the vibration part,
wherein the second surface of the vibration part is opposite to the first surface of the vibration part, and
wherein one of the first cover member and the second cover member includes a material having a moisture permeability equal to or less than 102 g·day/m2.

### Claim 2 (depends on 1)

The vibration apparatus of claim 1, wherein the vibration part includes a material represented by Equation 5 below:
(PbA-BCB)((Mg1/3Nb2/3)a(D1/3E2/3)b(ZrcTid))O3, [Equation 5]
where in Equation 5, ‘C’ is one of calcium Ca, strontium Sr, and barium Ba, ‘D’ is one of nickel Ni, manganese Mn, magnesium Mg, and cobalt Co, ‘E’ is niobium Nb or tantalum Ta, and
wherein in Equation 5, 0.80≤A-B≤0.98, 0.02≤B≤0.20, 0.05≤a≤0.25, 0.05≤b≤0.25, 0.10≤c≤0.50, and 0.10≤d≤0.50.

### Claim 3 (depends on 1)

The vibration apparatus of claim 1, wherein the vibration part has a phase transition temperature ranging from 160° C. to 180° C., and has a piezoelectric constant ranging from 900 pC/N to 1,100 pC/N.

### Claim 4 (depends on 1)

The vibration apparatus of claim 1, wherein the ratio of ‘a+b’ and ‘c+d’ is 1.0:1.9 to 1.0:2.8.

### Claim 5 (depends on 1)

The vibration apparatus of claim 1, wherein Equation 1 and Equation 2 have a pseudo cubic phase.

### Claim 6 (depends on 1)

The vibration apparatus of claim 1, wherein, in Equations 1 and 2, ‘a’ and ‘b’ have a same value or different values, and, in Equations 3 and 4, ‘c’ and ‘d’ have different values.

### Claim 7 (depends on 1)

The vibration apparatus of claim 1, wherein the vibration part includes:
a vibration layer including the electrostrictive material and the piezoelectric material;
a first electrode layer on a first surface of the vibration layer; and
a second electrode layer on a second surface of the vibration layer,
wherein the second surface of the vibration layer is different from the first surface of the vibration layer.

### Claim 8 (depends on 1)

The vibration apparatus of claim 1, wherein the vibration element further includes a signal supply member electrically connected with the vibration part, and
wherein a portion of the signal supply member is accommodated in a space between the cover member and the vibration part.

### Claim 9 (depends on 8)

The vibration apparatus of claim 8, wherein the signal supply member includes one of polyimide, polyethylene terephthalate, and polyethylene naphthalate having heat resistance.

### Claim 10 (depends on 1)

The vibration apparatus of claim 1, further comprising an adhesive layer between the vibration part and the cover member, wherein the adhesive layer includes a thermosetting resin.

### Claim 11 (depends on 1)

The vibration apparatus of claim 1, wherein the vibration element includes:
a first vibration generator;
a second vibration generator stacked on the first vibration generator; and
an intermediate member between the first vibration generator and the second vibration generator,
wherein one of the first vibration generator and the second vibration generator is connected to the vibration member.

### Claim 12 (depends on 11)

The vibration apparatus of claim 11, wherein each of the first vibration generator and the second vibration generator includes:
the vibration part; and
the cover member covering at least one of a first surface of the vibration part and a second surface of the vibration part, wherein the second surface of the vibration part is opposite to the first surface of the vibration part.

### Claim 13 (depends on 11)

The vibration apparatus of claim 11, wherein the first vibration generator is configured to be displaced in a same direction as the second vibration generator.

### Claim 14 (depends on 1)

The vibration apparatus of claim 1, wherein the vibration member includes a display panel having a plurality of pixels configured to display an image.

### Claim 15 (depends on 1)

The vibration apparatus of claim 1, wherein the vibration member includes at least one of metal, plastic, fiber, leather, wood, cloth, rubber, carbon, glass, and paper.