# US 8,787,592 B2 · Boundary microphone

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,787,592 B2
- Document ID: US8787592B2
- Status: Granted
- Kind: B2
- Application number: 13/116,306
- Filed: 2011-05-26
- Published: 2011-12-01
- Granted: 2014-07-22
- Earliest claimed: 2010-05-28
- Assignees: Kabushiki Kaisha Audio-Technica
- Applicants: Satoshi Yoshino
- Inventors: Satoshi Yoshino
- Web page: https://patentgrep.com/patent/US8787592B2

## CPC

- H04R 3/00: Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F)
- H04R 1/083: {Special constructions of mouthpieces}
- H04R 2209/022: Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils
- 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 membrane pressure-sensitive switch includes a circuit board provided with an electrode pattern detecting electrical conductivity, a membrane having a conductive surface, and a spacer interposed between the membrane and the circuit board. The electrode pattern is surrounded by a ground pattern on the front surface of the circuit board. The ground pattern on the front surface is connected to another ground pattern on the rear surface of the circuit board. The spacer is composed of a conductive material. The conductive surface of the membrane, the ground pattern on the front surface of the circuit board, and the spacer are electrically conducted. The electrode pattern is disposed between the conductive surface of the membrane and the other ground pattern on the rear surface of the circuit board.

## Claims

### Claim 1

A boundary microphone comprising:
a base;
a microphone unit installed in the base and converting sound into an electrical signal; and
a membrane pressure-sensitive switch turning on/off the output signal of the microphone unit,
the membrane pressure-sensitive switch comprising:
a circuit board provided with an electrode pattern detecting electrical conductivity;
a membrane having a conductive surface; and
a spacer interposed between the membrane and the circuit board,
wherein the electrode pattern on a front surface of the circuit board is surrounded by a first ground pattern on the front surface of the circuit board,
wherein the first ground pattern on the front surface is connected to a second ground pattern on a rear surface of the circuit board,
wherein the spacer comprises a conductive material,
wherein the conductive surface of the membrane, the first ground pattern on the front surface of the circuit board, and the spacer are electrically conducted, and
wherein the electrode pattern is disposed between the conductive surface of the membrane and the second ground pattern on the rear surface of the circuit board.

### Claim 2 (depends on 1)

The boundary microphone according to claim 1, wherein the conductive surface of the membrane comprises a conductive membrane adjacent to the front surface of the circuit board.

### Claim 3 (depends on 1)

The boundary microphone according to claim 1, wherein the conductive spacer has a window frame shape and the electrode pattern is disposed inside the conductive spacer in a radial direction.

### Claim 4 (depends on 1)

The boundary microphone according to claim 1, wherein the first ground pattern on the front surface is connected to the second ground pattern on the rear surface by through-hole plating.

### Claim 5 (depends on 1)

The boundary microphone according to claim 1, wherein the electrode pattern and the first ground pattern on the front surface are formed into an interdigital shape.

### Claim 6 (depends on 1)

The boundary microphone according to claim 1, wherein the conductive spacer comprises a conductive double-sided tape.