# US 8,739,926 B1 · Sound-transmitting membrane and electronic device equipped with sound-transmitting membrane

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- Number: US 8,739,926 B1
- Document ID: US8739926B1
- Status: Granted
- Kind: B1
- Application number: 13/868,607
- Filed: 2013-04-23
- Published: 2014-05-22
- Granted: 2014-06-03
- Earliest claimed: 2012-11-21
- Assignees: Nitto Denko Corporation
- Applicants: Nitto Denko Corporation
- Inventors: Masaaki Mori
- Web page: https://patentgrep.com/patent/US8739926B1

## CPC

- B32B 27/12: next to a fibrous or filamentary layer
- G10K 11/002: {Devices for damping, suppressing, obstructing or conducting sound in acoustic devices (G10K1/06 - G10K1/10 take precedence; for electro-mechanical transducers for communication H04R3/002)}
- B32B 5/022: {Non-woven fabric}
- B32B 5/22: characterised by the presence of two or more layers which {are next to each other and are fibrous, filamentary, formed of particles or foamed (layer formed of natural mineral fibres or particles next to a foam layer B32B19/047, next to a layer made of particles B32B19/048, or next to a fibrous or filamentary layer B32B19/06; paper layer or cardboard layer next to a paper layer or cardboard layer B32B29/005, next to a foam layer B32B29/007, next to a fibrous or filamentary layer B32B29/02, or next to a particulate layer B32B29/04)}
- B32B 5/24: one layer being a fibrous or filamentary layer
- B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE}
- D04H 13/00: Other non-woven fabrics
- G10K 11/18: Methods or devices for transmitting, conducting or directing sound (G10K11/02, G10K11/36 take precedence)
- H04R 1/023: {Screens for loudspeakers}
- H04R 1/086: {Protective screens, e.g. all weather or wind screens}
- B32B 2262/0207: Elastomeric fibres
- B32B 2262/0215: Thermoplastic elastomer fibers
- B32B 2307/10: having particular acoustical properties
- B32B 2457/00: Electrical equipment
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B)
- 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 sound-transmitting membrane (1) is provided that allows passage of sounds and prevents passage of foreign matters, the sound-transmitting membrane (1) including a supporting member (12) and a resin porous membrane (11) layered on the supporting member (12) and containing polytetrafluoroethylene as a main component. The supporting member (12) is a nonwoven fabric containing an elastomer. Since the supporting member (12) is a nonwoven fabric containing an elastomer, the insertion loss of the sound-transmitting membrane can be reduced for sounds of 3000 Hz.

## Claims

### Claim 1

A sound-transmitting membrane that allows passage of sounds and prevents passage of foreign matters, the sound-transmitting membrane comprising:
a supporting member; and
a resin porous membrane layered on the supporting member and containing polytetrafluoroethylene as a main component,
wherein the supporting member is a nonwoven fabric comprising an elastomer,
an insertion loss for sounds of 3000 Hz of the sound-transmitting membrane is smaller than or equal to 5 dB, and
a ratio of the insertion loss for the sounds of 3000 Hz to an insertion loss for sounds of 1000 Hz of the sound-transmitting membrane is in a range from 1.0 to 2.0.

### Claim 2 (depends on 1)

The sound-transmitting membrane according to claim 1, wherein a difference between a maximum value and a minimum value of insertion losses for sounds in a range from 100 Hz to 4000 Hz is smaller than or equal to 5 dB.

### Claim 3 (depends on 1)

The sound-transmitting membrane according to claim 1, having a surface density in a range from 5 to 50 g/m2.

### Claim 4 (depends on 1)

An electronic device comprising:
a sound emitter or a sound receiver; and
the sound-transmitting membrane according to claim 1 that is disposed so as to cover an opening corresponding to the sound emitter or the sound receiver.