# US 11,310,602 B2 · Bone conduction speaker

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- Number: US 11,310,602 B2
- Document ID: US11310602B2
- Status: Granted
- Kind: B2
- Application number: 16/923,015
- Filed: 2020-07-07
- Published: 2020-10-22
- Granted: 2022-04-19
- Earliest claimed: 2018-01-08
- Assignees: Shenzhen Shokz Co., Ltd.
- Applicants: Shenzhen Shokz Co., Ltd.
- Inventors: Lei Zhang; Fengyun Liao; Xin Qi
- Web page: https://patentgrep.com/patent/US11310602B2

## CPC

- H04R 9/025: {Magnetic circuit}
- H01F 7/081: {Magnetic constructions}
- H01F 7/121: Guiding or setting position of armatures, e.g. retaining armatures in their end position
- H04R 1/1091: {Details not provided for in groups H04R1/1008 - H04R1/1083}
- H04R 9/06: Loudspeakers
- H04R 2460/13: Hearing devices using bone conduction transducers
- 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)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

The present disclosure relates to a magnetic circuit assembly of a bone conduction speaker. The magnetic circuit assembly may generate a first magnetic field. The magnetic circuit assembly may include a first magnetic element, and the first magnetic element may generate a second magnetic field. The magnetic circuit may further include a first magnetic guide element and at least one second magnetic element. The at least one second magnetic element may be configured to surround the first magnetic element and a magnetic gap may be configured between the second magnetic element and the first magnetic element. A magnetic field strength of the first magnetic field within the magnetic gap may exceed a magnetic field strength of the second magnetic field within the magnetic gap.

## Claims

### Claim 1

A magnetic circuit assembly of a bone conduction speaker, wherein the magnetic circuit assembly generates a first magnetic field, and the magnetic circuit assembly includes: a first magnetic element generating a second magnetic field; a first magnetic guide element; at least one second magnetic element configured to surround the first magnetic element, a magnetic gap being configured between the at least one second magnetic element and the first magnetic element, wherein a magnetic field strength of the first magnetic field within the magnetic gap exceeds a magnetic field strength of the second magnetic field within the magnetic gap; a second magnetic guide element; and at least one third magnetic element connected with the second magnetic guide element and the at least one second magnetic element; and further comprising: at least one fourth magnetic element located below the magnetic gap, wherein the at least one fourth magnetic element is connected with the first magnetic element and the second magnetic guide element.

### Claim 2 (depends on 1)

The magnetic circuit assembly of claim 1, wherein an included angle between a magnetization direction of the at least one second magnetic element and a magnetization direction of the first magnetic element is in a range from 45 degrees to 135 degrees.

### Claim 3 (depends on 2)

The magnetic circuit assembly of claim 2, wherein the included angle between the magnetization direction of the at least one second magnetic element and the magnetization direction of the first magnetic element is not less than 90 degrees.

### Claim 4 (depends on 1)

The magnetic circuit assembly of claim 1, wherein an included angle between a magnetization direction of the at least one third magnetic element and a magnetization direction of the first magnetic element is in a range from 45 degrees to 135 degrees.

### Claim 5 (depends on 4)

The magnetic circuit assembly of claim 4, wherein the included angle between the magnetization direction of the at least one third magnetic element and the magnetization direction of the first magnetic element is not less than 90 degrees.

### Claim 6 (depends on 4)

The magnetic circuit assembly of claim 4, wherein an included angle between a magnetization direction of the at least one fourth magnetic element and the magnetization direction of the first magnetic element is in a range from 45 degrees to 135 degrees.

### Claim 7 (depends on 6)

The magnetic circuit assembly of claim 6, wherein the included angle between the magnetization direction of the at least one fourth magnetic element and the magnetization direction of the first magnetic element does not exceed 90 degrees.

### Claim 8 (depends on 1)

The magnetic circuit assembly of claim 1, further comprising:
at least one fifth magnetic element connected with an upper surface of the first magnetic guide element.

### Claim 9 (depends on 8)

The magnetic circuit assembly of claim 8, wherein an included angle between a magnetization direction of the at least one fifth magnetic element and a magnetization direction of the first magnetic element is in a range from 150 degrees to 180 degrees.

### Claim 10 (depends on 8)

The magnetic circuit assembly of claim 8, wherein a ratio of a thickness of the first magnetic element to a sum of the thickness of the first magnetic element, a thickness of the at least one fifth magnetic element, and a thickness of the first magnetic guide element ranges from 0.4 to 0.6.

### Claim 11 (depends on 8)

The magnetic circuit assembly of claim 8, wherein the thickness of the at least one fifth magnetic element is equal to the thickness of the first magnetic element.

### Claim 12 (depends on 8)

The magnetic circuit assembly of claim 8, wherein the thickness of the at least one fifth magnetic element is less than the thickness of the first magnetic element.

### Claim 13 (depends on 8)

The magnetic circuit assembly of claim 8, further comprising:
a third magnetic guide element connected with an upper surface of the fifth magnetic element, wherein the third magnetic guide element is configured to suppress leakage of a field strength of the first magnetic field.

### Claim 14 (depends on 1)

The magnetic circuit assembly of claim 1, wherein the first magnetic guide element is connected with an upper surface of the first magnetic element, the second magnetic guide element includes a baseplate and a side wall, and the first magnetic element is connected with the baseplate of the second magnetic guide element.

### Claim 15 (depends on 1)

The magnetic circuit assembly of claim 1, further comprising:
at least one conductive element connected with at least one of the first magnetic element, the first magnetic guide element, or the second magnetic guide element.

### Claim 16

A magnetic circuit assembly of a bone conduction speaker, wherein the magnetic assembly generates a first magnetic field, the magnetic circuit assembly includes: a first magnetic element generating a second magnetic field; a first magnetic guide element; a second magnetic guide element configured to surround the first magnetic element, a magnetic gap being configured between the second magnetic guide element and the first magnetic element; at least one second magnetic element located below the magnetic gap, wherein a magnetic field strength of the first magnetic field within the magnetic gap exceeds a magnetic field strength of the second magnetic field within the magnetic gap; and at least one third magnetic element connected with the second magnetic guide element; and further comprising: at least one fourth magnetic element located below the magnetic gap, wherein the at least one fourth magnetic element is connected with the first magnetic element and the second magnetic guide element.

### Claim 17 (depends on 16)

The magnetic circuit assembly of claim 16, further comprising:
a magnetic shield configured to encompass the first magnetic element, the first magnetic guide element, the second magnetic guide element, and the second magnetic element.

### Claim 18

A magnetic circuit assembly of a bone conduction speaker, wherein the magnetic circuit assembly generates a first magnetic field, and the magnetic circuit assembly includes: a first magnetic element generating a second magnetic field; a first magnetic guide element; a second magnetic guide element, at least a portion of the second magnetic guide element being configured to surround the first magnetic element and a magnetic gap being configured between the second magnetic guide element and the first magnetic element; at least one second magnetic element connected with an upper surface of the first magnetic guide element, wherein a magnetic field strength of the first magnetic field within the magnetic gap exceeds a magnetic field strength of the second magnetic field within the magnetic gap; and at least one third magnetic element connected with the second magnetic guide element; and further comprising: at least one fourth magnetic element located below the magnetic gap, wherein the at least one fourth magnetic element is connected with the first magnetic element and the second magnetic guide element.