# US 12,764,462 B2 · Microphone module

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- Number: US 12,764,462 B2
- Document ID: US12764462B2
- Status: Granted
- Kind: B2
- Application number: 18/908,779
- Filed: 2024-10-07
- Published: 2025-11-20
- Granted: 2026-10-13
- Earliest claimed: 2024-05-20
- Assignees: Merry Electronics(Shenzhen) Co., Ltd.
- Applicants: Merry Electronics(Shenzhen) Co., Ltd.
- Inventors: Chao-Sen Chang; Cheng Yuan Chan; Yueh-Kang Lee
- Web page: https://patentgrep.com/patent/US12764462B2

## CPC

- H04R 1/44: Special adaptations for subaqueous use, e.g. for hydrophone
- H04R 1/083: {Special constructions of mouthpieces}
- 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

Disclosed is a microphone module including a casing, a microphone, a drainage structure, a waterproof membrane and a limiting member. The casing has a recess. The microphone is disposed in the casing, and corresponds to the recess. The drainage structure is disposed at the casing and includes a first channel and a second channel communicated to each other. A first sound hole of the first channel is exposed from the casing, and a second sound hole of the second channel corresponds to the microphone. A waterproof membrane is disposed in the recess and located between the microphone and the second sound hole. The limiting member is disposed in the recess and located between the microphone and the waterproof membrane.

## Claims

### Claim 1

A microphone module, comprising:
a casing, having a recess;
a microphone, disposed in the casing and corresponds to the recess;
a drainage structure, disposed on the casing and comprising a first channel and a second channel connected to each other, wherein a first sound hole of the first channel is exposed from the casing, and a second sound hole of the second channel corresponds to the microphone;
a waterproof membrane, disposed in the recess and located between the microphone and the second sound hole; and
a limiting member, disposed in the recess and located between the microphone and the waterproof membrane,
wherein a material of the limiting member is a mesh fabric.

### Claim 2 (depends on 1)

The microphone module according to claim 1, wherein there is a first gap between the limiting member and the waterproof membrane, and the first gap is greater than or equal to 0.1 mm and less than or equal to 1 mm.

### Claim 3 (depends on 1)

The microphone module according to claim 1, wherein a rigidity of the limiting member is greater than a rigidity of the waterproof membrane, and the rigidity of the limiting member is greater than 50 MPa.

### Claim 4 (depends on 1)

The microphone module according to claim 1, wherein an air permeability of the limiting member is greater than an air permeability of the waterproof membrane, and the air permeability of the limiting member is greater than 100 mm/s.

### Claim 5 (depends on 1)

The microphone module according to claim 1, wherein the first sound hole comprises a plurality of first sub-sound holes, and the second sound hole comprises a plurality of second sub-sound holes.

### Claim 6 (depends on 5)

The microphone module according to claim 5, wherein the plurality of second sub-sound holes are formed on a bottom surface of the recess.

### Claim 7 (depends on 6)

The microphone module according to claim 6, wherein there is a second gap between the waterproof membrane and the bottom surface, and the second gap is greater than or equal to 0.1 mm and less than or equal to 3 mm.

### Claim 8 (depends on 1)

The microphone module according to claim 1, further comprising a multi-layer colloid, and the multi-layer colloid is disposed in the recess of the casing.

### Claim 9 (depends on 8)

The microphone module according to claim 8, wherein the waterproof membrane and the limiting member are respectively sandwiched between any two layers of the multi-layer colloid and connected to the casing through the multi-layer colloid.

### Claim 10 (depends on 1)

The microphone module according to claim 1, further comprising a circuit board and a circuit assembly, wherein the circuit board is disposed in the casing, at least part of the circuit assembly is disposed in the casing, and the microphone is connected to the circuit board.