# US 10,484,789 B2 · Micro-speaker having an air adsorbent

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- Number: US 10,484,789 B2
- Document ID: US10484789B2
- Status: Granted
- Kind: B2
- Application number: 15/392,443
- Filed: 2016-12-28
- Published: 2017-06-29
- Granted: 2019-11-19
- Earliest claimed: 2015-12-29
- Assignees: EM-TECH Co., Ltd.
- Applicants: EM-TECH. Co., Ltd.
- Inventors: Ghi Yuun Kang
- Web page: https://patentgrep.com/patent/US10484789B2

## CPC

- H04R 1/288: {for loudspeaker transducers}
- B01J 20/18: Synthetic zeolitic molecular sieves
- B01J 20/28004: {Sorbent size or size distribution, e.g. particle size}
- B01J 20/28061: {being in the range 100-500 m2/g}
- B01J 20/28069: {Pore volume, e.g. total pore volume, mesopore volume, micropore volume}
- H04R 1/2811: {for loudspeaker 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)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

The present invention relates to a micro-speaker for use in a small electronic device, and more particularly, to a micro-speaker having an enclosure applied thereto and having an air adsorbent which can improve the low frequency sound quality. According to the present invention, it is possible to provide a micro-speaker which shows excellent improvement in the low frequency characteristics, regardless of a mass ratio of silicon to aluminum of an air adsorbent, and also possible to provide a micro-speaker which shows excellent improvement in the low frequency characteristics at a low cost, by reducing a mass ratio of silicon to aluminum, as compared with the conventional micro-speaker having an air adsorbent.

## Claims

### Claim 1

A micro-speaker, comprising:
an enclosure;
a speaker unit accommodated in the enclosure;
a resonance space defined between the enclosure and the speaker unit; and
an air adsorbent provided in the resonance space,
wherein the air adsorbent is zeolite having at least 40% of channels with a size of 0.4 nm to 0.6 nm,
wherein the zeolite is provided in the form of granules with a grain size of 0.2 mm to 0.5 mm.

### Claim 2 (depends on 1)

The micro-speaker of claim 1, wherein the zeolite is selected from the group consisting of FER, MFI, MEL, TON, and MFS.

### Claim 3 (depends on 1)

The micro-speaker of claim 1, wherein the zeolite has a specific surface area BET of at least 400 m2/g.

### Claim 4 (depends on 1)

The micro-speaker of claim 1, wherein inner micropores of the zeolite have a volume of 0.25 cm3/g to 0.35 cm3/g per unit mass.

### Claim 5 (depends on 1)

The micro-speaker of claim 1, wherein the air adsorbent is arranged in a specific portion of the resonance space.

### Claim 6 (depends on 5)

The micro-speaker of claim 5, wherein the air adsorbent comprises two or more air adsorbent arrangement portions provided around the speaker unit.

### Claim 7 (depends on 5)

The micro-speaker of claim 5, wherein the air adsorbent surrounds the speaker unit in a non-continuous manner.