# US 12,192,708 B2 · Bone conduction acoustic transmission device

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- Number: US 12,192,708 B2
- Document ID: US12192708B2
- Status: Granted
- Kind: B2
- Application number: 16/641,502
- Filed: 2018-06-20
- Published: 2021-07-15
- Granted: 2025-01-07
- Earliest claimed: 2017-09-13
- Assignees: Sony Corporation
- Applicants: Sony Corporation
- Inventors: Junichi Rekimto
- Web page: https://patentgrep.com/patent/US12192708B2

## CPC

- H04R 25/606: {acting directly on the eardrum, the ossicles or the skull, e.g. mastoid, tooth, maxillary or mandibular bone, or mechanically stimulating the cochlea, e.g. at the oval window}
- H04R 1/1041: {Mechanical or electronic switches, or control elements (switches in general H01H)}
- H04R 1/1075: {Mountings of transducers in earphones or headphones}
- H04R 11/02: 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)

## Abstract

A bone conduction acoustic transmission device according to the present invention is provided with a first magnetic body to be placed in contact with or to be embedded in the head of a living body beforehand, and a coil unit provided separately from the first magnetic body. The coil unit has a coil configured using a predetermined casing that can be mounted on the first magnetic body and a second magnetic body which is provided in a predetermined position of the casing and does not vibrate due to the coil, and the first magnetic body vibrates as a result of applying an acoustic signal to the coil with the coil unit mounted on the head.

## Claims

### Claim 1

A bone conduction acoustic transmission device, comprising:
a first magnetic body placeable to be in contact with or embeddable in a head of a living body;
a coil unit separate from the first magnetic body, wherein
the coil unit includes:
a casing mountable on the first magnetic body;
a coil wound around the casing; and
a second magnetic body inside the casing, wherein the second magnetic body is configured not to vibrate due to the coil, and
the first magnetic body is configured to vibrate based on an acoustic signal applied to the coil with the coil unit mounted on the head; and
a vibration damping member that protrudes from a bottom surface of the casing, wherein
the bottom surface of the casing is on a side opposite the head,
the vibration damping member is configured to enclose sides of the first magnetic body with the coil unit is mounted on the head, and
a height at which the vibration damping member protrudes from the bottom surface is higher than a height of the first magnetic body.

### Claim 2 (depends on 1)

The bone conduction acoustic transmission device as claimed in claim 1, wherein, based on a magnetic interaction between the first magnetic body and the second magnetic body, a positional relationship between the first magnetic body and the coil unit is fixed.

### Claim 3 (depends on 1)

The bone conduction acoustic transmission device as claimed in claim 1, wherein, with the coil unit mounted on the head, the second magnetic body is in a position inside a magnetic field of the first magnetic body.

### Claim 4 (depends on 1)

The bone conduction acoustic transmission device as claimed in claim 1, wherein the vibration damping member is of a material that blocks a magnetic field of the first magnetic body.

### Claim 5 (depends on 1)

The bone conduction acoustic transmission device as claimed in claim 1, wherein a number of windings of the coil is adjustable to establish an impedance match with an output source of the acoustic signal applied to the coil.

### Claim 6 (depends on 1)

The bone conduction acoustic transmission device as claimed in claim 1, wherein the first magnetic body is machined to ensure breathability for skin of the living body.

### Claim 7 (depends on 1)

The bone conduction acoustic transmission device as claimed in claim 1, wherein the first magnetic body is detachably placeable to be in contact with the head via a material adherable to skin of the living body.

### Claim 8 (depends on 1)

The bone conduction acoustic transmission device as claimed in claim 1, wherein the first magnetic body is detachably placeable to be in contact with the head via an adhesive body that covers the first magnetic body.

### Claim 9 (depends on 1)

The bone conduction acoustic transmission device as claimed in claim 1, wherein
the first magnetic body is embeddable in the living body, and
a periphery of the first magnetic body is coated with a material that does not interfere immunologically with the living body.

### Claim 10 (depends on 1)

The bone conduction acoustic transmission device as claimed in claim 1, wherein the first magnetic body is a neodymium magnet.