Sound absorbing device, electronic device, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-10332500-B2
Application number	US-201815915395-A
Country	US
Kind code	B2
Filing date	Mar 8, 2018
Priority date	Apr 28, 2014
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

A sound absorbing device includes: a plurality of sound absorbing units. A frequency of sound absorbed by at least one of the sound absorbing units overlaps, at least partially, with a frequency of sound with a volume increased by installation of another sound absorbing unit.

First claim

The invention claimed is:

1. A sound absorbing device comprising:
at least one Helmholtz resonator including a first member and a second member, the first member having openings therein, and the second member combining with a part of the first member to form cavities, the first member being pairable with and the second member in a plurality of ways;
a sound detector configured to detect sound from a sound source;
a moving device configured to move a first one of the first member and the second member relative to a second one of the first member and the second member to pair the first member and the second member in different ones of the plurality of ways; and
a controller configured to control driving of the moving device based on a result of detection of the sound by the sound detector.

2. The sound absorbing device according to claim 1 , further comprising:
a position detector configured to detect a relative position between the first member and the second member.

3. The sound absorbing device according to claim 1 , wherein the controller is configured to change a frequency of sound absorbed by the at least one Helmholtz resonator by changing which one of the openings of the first member and which one of the cavities of the second member are paired.

4. The sound absorbing device according to claim 3 , wherein the first member includes a sheet member having the openings therein, and the cavities are partitioned with walls in the second member.

5. The sound absorbing device according to claim 3 , wherein one or more of the first member and the second member includes a magnet.

6. The sound absorbing device according to claim 1 , further comprising:
a memory configured to store frequencies of sound absorbed by pairing the first member and the second member different ones of the plurality of ways.

7. The sound absorbing device according to claim 1 , wherein the openings include necks each having a different length.

8. The sound absorbing device according to claim 1 , wherein the openings are different in aperture area.

9. The sound absorbing device according to claim 1 , wherein the cavities formed by the first member and the second member are different in volume.

10. An electronic device comprising:
the sound absorbing device according to claim 1 ; and
the sound source inside the electronic device.

11. An image forming apparatus comprising:
an image forming device; and
the electronic device according to claim 10 .

Assignees

• Ishida Masahiro
• Matsuda Naoki
• Ricoh Co Ltd

Inventors

• Ishida Masahiro
• Matsuda Naoki

Classifications

• G10K11/16

  Methods or devices for protecting against, or for damping, noise or other acoustic waves in general (G10K11/36 takes precedence) · CPC title

• B41J29/08 Primary

  Sound-deadening, or shock-absorbing stands, supports, cases or pads separate from machines · CPC title

• G10K2210/1052

  Copiers or other image-forming apparatus, e.g. laser printer · CPC title

• G10K11/002 Primary

  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) · CPC title

• B41J29/13

  Cases or covers · CPC title