Acoustic device and electronic device and image forming apparatus incorporating same

Patent metadata

Field	Value
Publication number	US-10088796-B2
Application number	US-201615159908-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	May 28, 2015
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

An acoustic device includes a first member; a second member; a cavity formed by joining the first member and the second member together; and a port to communicate the cavity with an outside. The port is disposed at a joint portion between the first member and the second member. The first member includes a bottom plate disposed opposite the second member with the cavity in between and a side wall extending from the bottom plate toward the second member, and an edge face of the side wall, opposite the bottom plate, contacts the second member, to form different cavities. The acoustic device further includes a hole that penetrates the side wall and a material of the second member has a density greater than that of the first member.

First claim

What is claimed is:

1. An acoustic device comprising:
a plurality of adjacent sound absorbing parts, each of the plurality of adjacent sound absorbing parts including,
a first member,
a second member,
a cavity formed by joining the first member and the second member together, and
a communication portion at a joint portion between the first member and the second member to communicate the cavity of a respective one of the plurality of adjacent sound absorbing parts with an outside, wherein
each of the plurality of adjacent sound absorbing parts includes only one cavity and only one communication portion, and
the plurality of adjacent sound absorbing parts surround a center portion of the acoustic device so that the communicating portion of each of the plurality of adjacent sound absorbing parts is oriented to the center portion of the acoustic device.

2. The acoustic device according to claim 1 , wherein the communication portion includes a face extending in an opening direction of the communication portion, and a part of the face is on the same plane as a part of a face forming the cavity.

3. The acoustic device according to claim 1 , wherein the first member, made of a resin material, comprises:
a bottom plate disposed opposite the second member with the cavity in between;
a side wall extending from the bottom plate to the second member, wherein an edge portion of the side wall of the first member opposite the bottom plate is joined to the second member, to join the first member and the second member together; and
a concave portion disposed at a part of a joint surface of the first member, to join the second member to form the communication portion.

4. The acoustic device according to claim 3 , wherein:
the first member includes the side wall including a first side wall vertically extending upwards from one face of the bottom plate and a second side wall vertically extending downwards from another face of the bottom plate, an edge face of the first side wall opposite the bottom plate and an end face of the second side wall opposite the bottom plate are joined to separate portions of the second member to form different cavities; and
the concave portion is disposed at a portion of the edge face of each of the first side wall and the second side wall, to join the second member to form the communication portion.

5. The acoustic device according to claim 1 , wherein at least one of the first member and the second member surrounds a peripheral area of a center portion of the acoustic device, the peripheral area ranging from 180 degrees or more to less than 360 degrees.

6. The acoustic device according to claim 1 , wherein at least one of the first member and the second member surrounds an entire area of a periphery of a center portion of the acoustic device.

7. The acoustic device according to claim 5 , wherein the at least one of the first member and the second member surrounding the center portion of the acoustic device has a circular arc shape.

8. The acoustic device according to claim 5 , wherein the at least one of the first member and the second member surrounding the center portion of the acoustic device has a polygonal shape.

9. The acoustic device according to claim 5 , wherein a plurality of sets of the cavity and the communication portion is disposed in a peripheral direction of the center portion of the acoustic device.

10. The acoustic device according to claim 9 , wherein the communication portion is open toward the center portion of the acoustic device.

11. The acoustic device according to claim 5 , further comprising:
at least one of a drive transmitter; and a drive output device, wherein
a rotary shaft of the drive transmitter or the drive output device is disposed at the center portion of the acoustic device.

12. An acoustic device comprising:
a first member;
a second member;
a cavity formed by joining the first member and the second member together; and
a single communication portion at a joint portion between the first member and the second member to communicate the cavity with an outside such that the cavity is configured to communicate with the outside only through the single communication portion, wherein
a material of the second member has a density greater than a density of a material of the first member.

13. The acoustic device according to claim 1 , wherein:
the first member includes a bottom plate disposed opposite the second member with the cavity in between, and a side wall extending from the bottom plate to the second member; and
an edge face of the side wall opposite the bottom plate contacts a planar portion of the second member, to form the cavity, and the planar portion of the second member projects further outwards than the side wall forming a part including the communication portion at the joint portion.

14. An acoustic device comprising:
a first member;
a second member;
a cavity formed by joining the first member and the second member together; and
a communication portion to communicate the cavity with an outside, wherein
the first member includes a bottom plate opposed to the second member with the cavity in between and a side wall extending from the bottom plate toward the second member,
an edge face of the side wall, opposite the bottom plate, contacts the second member, to thereby form the cavity,
the communication portion includes a hole that penetrates the side wall, and
a material of the second member has a density greater than a density of a material of the first member.

15. The acoustic device according to claim 14 , wherein the hole is disposed at a position nearer to a joint portion between the first member and the second member than to a center of the side wall extending from the bottom plate to the second member.

16. An acoustic device comprising:
a plurality of adjacent sound absorbing parts, each of the plurality of adjacent sound absorbing parts including,
a first member,
a second member,
a cavity formed by joining the first member and the second member together, and
a communicating portion disposed at a joint portion between the first member and the second member to communicate the cavity to an outside, wherein,
in at least one of the plurality of adjacent sound absorbing parts,
the first member includes a bottom plate opposed to the second member with the cavity in between, and a side wall extending from the bottom plate toward the second member,
an edge face of the side wall, opposite the bottom plate, contacts a planar portion of the second member to form the cavity,
the communication portion includes a hole that penetrates the side wall, and
a planar portion of the second member projects further outward than the side wall having the hole, and

the plurality of adjacent sound absorbing parts surround a center portion of the acoustic device so that the communicating portion of each of the plurality of adjacent sound absorbing parts is oriented to the center portion.

17. The acoustic device according to claim 1 , wherein each of the plurality of adjacent sound absorbing parts further includes fastening screws to fasten the first member and the second member together.

18. The acoustic device according to claim 1 , wherein each of the plurality of adjacent sound absorbing parts further includes an elastic member disposed between the first member and the second member.

19. An electronic device comprising the acoustic device according to claim 1 .

20. An image forming apparatus employing an electrophotographic

Assignees

• Ishida Masahiro
• Matsuda Naoki
• Ricoh Co Ltd

Inventors

• Ishida Masahiro
• Matsuda Naoki

Classifications

• G03G21/1619 Primary

  Frame structures · CPC title

• G10K11/172 Primary

  using resonance effects · CPC title