# US 12,010,499 B2 · Micro speaker with symmetrical voice coil and magnetic circuit

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- Number: US 12,010,499 B2
- Document ID: US12010499B2
- Status: Granted
- Kind: B2
- Application number: 17/614,926
- Filed: 2019-05-30
- Published: 2022-07-28
- Granted: 2024-06-11
- Earliest claimed: 2019-05-30
- Assignees: Harman International Industries, Incorporated
- Applicants: Harman International Industries, Incorporated
- Inventors: Zhenjin Zhu; Yuanzhen Niu; Jihui Zeng; Hong Wen
- Web page: https://patentgrep.com/patent/US12010499B2

## CPC

- H04R 9/06: Loudspeakers
- H04R 1/028: {associated with devices performing functions other than acoustics, e.g. electric candles}
- H04R 7/12: Non-planar diaphragms or cones
- H04R 9/025: {Magnetic circuit}
- H04R 9/046: {Construction}
- H04R 2499/11: Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
- 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

An ultra slim micro-speaker is provided with a middle gasket between the voice coil and the diaphragm is provided. A distance between a top of a top plate and a top of the voice coil can be equal to a distance between a bottom of the top plate and a bottom of the voice coil, and a winding height has a symmetrical relationship in the magnetic circuit with a BL(x) curve of the magnetic circuit having improved symmetry.

## Claims

### Claim 1

A speaker, comprising:
a diaphragm;
a magnetic circuit structure including a magnet gap;
a voice coil suspended in the magnet gap, and
a middle gasket sandwiched between the diaphragm and the voice coil and being connected to the diaphragm and the voice coil,
wherein a distance between a top of the voice coil and a top of a top plate is equal a distance between a bottom of the voice coil and a bottom of the top plate in a vertical direction.

### Claim 2 (depends on 1)

The speaker of claim 1, wherein the magnetic circuit structure further comprises a top plate and at least a side top plate, and the magnet gap is formed therebetween.

### Claim 3 (depends on 2)

The speaker of claim 2, wherein the voice coil is configured to be symmetrical with the magnetic circuit structure relative to a center horizontal plane of the top plate and the at least side top plate.

### Claim 4 (depends on 1)

The speaker of claim 1, wherein the middle gasket is configured as a ring.

### Claim 5 (depends on 1)

The speaker of claim 1, wherein the middle gasket is formed in one of a rectangular shape, a circular shape, or a racetrack-like shape.

### Claim 6 (depends on 1)

The speaker of claim 1, wherein the magnetic circuit structure further comprises a magnet structure formed with a single magnet.

### Claim 7 (depends on 1)

The speaker of claim 1, wherein the magnet circuit structure is formed with a multi-magnet such as a three-magnet structure or a five-magnet structure.

### Claim 8 (depends on 1)

The speaker of claim 1, wherein the middle gasket is made from a light-weight material.

### Claim 9 (depends on 8)

The speaker of claim 8, wherein the middle gasket is made from at least one of metal, plastic, or paper.

### Claim 10 (depends on 1)

The speaker of claim 1, wherein the speaker is an ultra slim micro-speaker.

### Claim 11 (depends on 1)

The speaker of claim 1, wherein the speaker is used with an integrated and thin-profile electronic product.

### Claim 12 (depends on 11)

The speaker of claim 11, wherein the integrated and thin-profile electronic product is at least a mobile phone, a tablet, a computer or an audio playing device.

### Claim 13

A speaker, comprising:
a diaphragm;
a magnetic circuit structure including a magnet gap;
a voice coil suspended in the magnet gap and moving with the diaphragm to produce an audible sound, and
a middle gasket sandwiched between the diaphragm and the voice coil and being connected to the diaphragm and the voice coil,
wherein a distance between a top of the voice coil and a top of a top plate is equal a distance between a bottom of the voice coil and a bottom of the top plate in a vertical direction.

### Claim 14 (depends on 13)

The speaker of claim 13, wherein the magnetic circuit structure further comprises a top plate and at least a side top plate, and the magnet gap is formed therebetween.

### Claim 15 (depends on 14)

The speaker of claim 14, wherein the voice coil is configured to be symmetrical with the magnetic circuit structure relative to a center horizontal plane of the top plate and the at least side top plate.

### Claim 16 (depends on 13)

The speaker of claim 13, wherein the middle gasket is configured as a ring.

### Claim 17 (depends on 13)

The speaker of claim 13, wherein the middle gasket is formed in one of a rectangular shape, a circular shape, or a racetrack-like shape.

### Claim 18

A speaker, comprising:
a diaphragm;
a magnetic circuit structure including a magnet gap and concentrating magnetic flux into the magnetic gap;
a voice coil suspended in the magnet gap and moving with the diaphragm to produce an audible sound, and
a middle gasket sandwiched between the diaphragm and the voice coil and being connected to the diaphragm and the voice coil,
wherein a distance between a top of the voice coil and a top of a top plate is equal a distance between a bottom of the voice coil and a bottom of the top plate in a vertical direction.