# US 9,038,769 B2 · Sound absorbing body and electronic device

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

- Number: US 9,038,769 B2
- Document ID: US9038769B2
- Status: Granted
- Kind: B2
- Application number: 14/177,426
- Filed: 2014-02-11
- Published: 2014-08-14
- Granted: 2015-05-26
- Earliest claimed: 2013-02-14
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Kiyoshi Tsujino
- Web page: https://patentgrep.com/patent/US9038769B2

## CPC

- G10K 11/162: Selection of materials
- G10K 11/168: Plural layers of different materials, e.g. sandwiches
- 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

## Abstract

A sound absorbing body includes parts of different densities including a plurality of non-dense parts of lower density and a plurality of dense parts of higher density. The non-dense parts and the dense parts are alternately laminated obliquely.

## Claims

### Claim 1

A sound absorbing body comprising:
parts of different densities including a plurality of non-dense parts of lower density and a plurality of dense parts of higher density with the non-dense parts and the dense parts being alternately laminated obliquely,
the non-dense parts having the same first volumetric mass density,
the dense parts having the same second volumetric mass density greater than the same first volumetric mass density.

### Claim 2 (depends on 1)

The sound absorbing body according to claim 1, wherein
a thickness in a lamination direction of the non-dense parts is thicker than a thickness in the lamination direction of the dense parts.

### Claim 3 (depends on 1)

The sound absorbing body according to claim 1, wherein
the dense parts and the non-dense parts include cellulose fibers, and
the density of the dense parts and the non-dense parts is a density of the cellulose fibers.

### Claim 4 (depends on 1)

The sound absorbing body according to claim 1, wherein
the dense parts and the non-dense parts include molten resin, and
the density of the dense parts and the non-dense parts is a density of the molten resin.

### Claim 5 (depends on 1)

The sound absorbing body according to claim 1, wherein
the dense parts and the non-dense parts include flame retardant, and
the density of the dense parts and the non-dense parts is a density of the flame retardant.

### Claim 6 (depends on 1)

The sound absorbing body according to claim 1, wherein
the dense parts and the non-dense parts include molten resin, and
the non-dense parts and the dense parts are bonded by the molten resin.

### Claim 7 (depends on 1)

An electronic device comprising the sound absorbing body according to claim 1.