Sound device and portable terminal

Patent metadata

Field	Value
Publication number	US-11317217-B2
Application number	US-201817256611-A
Country	US
Kind code	B2
Filing date	Dec 17, 2018
Priority date	Jun 25, 2018
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

Disclosed are a sound device and a portable terminal. The sound device includes a first vibration system including a bobbin voice coil, the bobbin voice coil being provided behind a first diaphragm and fixedly connected to the first diaphragm, the bobbin voice coil including a bobbin and a voice coil body formed by winding voice coil leads on the bobbin, one end of the bobbin away from the first diaphragm at least partially configured to protrude from the voice coil body; a second vibration system including a second diaphragm opposite to the first diaphragm; and a magnetic circuit system between the first diaphragm and the second diaphragm, the magnetic circuit system being provided with an avoiding portion. One end of the bobbin away from the first diaphragm is movable to penetrate through the avoiding portion and is fixedly connected to the second diaphragm.

First claim

What is claimed is:

1. A sound device, comprising:
a first vibration system including a bobbin voice coil, the bobbin voice coil being provided behind a first diaphragm and fixedly connected to the first diaphragm, the bobbin voice coil including a bobbin and a voice coil body formed by winding voice coil leads on the bobbin, one end of the bobbin away from the first diaphragm at least partially configured to protrude from the voice coil body;
a second vibration system including a second diaphragm opposite to the first diaphragm; and
a magnetic circuit system between the first diaphragm and the second diaphragm, the magnetic circuit system being provided with an avoiding portion,
wherein one end of the bobbin away from the first diaphragm is movable to penetrate through the avoiding portion and is fixedly connected to the second diaphragm;
the magnetic circuit system includes a magnetic conductive yoke and a center magnetic circuit portion and a side magnetic circuit portion provided on the magnetic conductive yoke;
a magnetic gap for receiving the bobbin voice coil is provided between the center magnetic circuit portion and the side magnetic circuit portion; and
the magnetic conductive yoke includes two long sides pposite to each other and two short sides,
the long side and the short side are spaced apart,
the center magnetic circuit portion is located in a middle of the magnetic conductive yoke,
the side magnetic circuit portions is located on opposit sides of the center magnetic circuit portion and extending along, the long sides,
a position of the magnetic conductive yoke corresponding to each of the two short sides is provided with an avoiding notch to form an avoiding portion, and
the bobbin includes a supporting portion and a connecting portion, the supporting portion is wound with the voice coil leads to form the voice coil body, the connecting portion is connected to the supporting portion and protruded from the voice coil body, and the connecting portion is configured to pass through the avoiding notch and is fixedly connected to the second diaphragm.

2. The sound device of claim 1 , wherein:
at least one of the center magnetic circuit portion and the side magnetic circuit portion is provided with a permanent magnet.

3. The sound device of claim 1 , wherein a first acoustic cavity is provided between the magnetic circuit system and the first diaphragm, a second acoustic cavity is provided between the magnetic circuit system and the second diaphragm, and the avoiding portion is in communication with the first acoustic cavity and the second acoustic cavity.

4. The sound device of claim 1 , wherein a side wall of the connecting portion is folded towards inside the bobbin and/or towards outside the bobbin to form a connecting flange, and a bottom surface of the connecting flange away from the supporting portion is fixedly connected to the second diaphragm.

5. The sound device of claim 4 , wherein a plurality of connecting flanges are spaced apart, and folding directions of two adjacent connecting flanges are identical or different.

6. The sound device of claim 1 , wherein a side wall of the supporting portion is folded towards inside the bobbin and/or towards outside the bobbin to form a mounting flange, and a bottom surface of the mounting flange away from the connecting portion is fixedly connected to the first diaphragm.

7. The sound device of claim 1 , wherein an end surface of the supporting portion close to the first diaphragm is flush with an end surface of the voice coil body close to the first diaphragm, or an end surface of the supporting portion close to the first diaphragm is higher than an end surface of the voice coil body close to the first diaphragm.

8. The sound device of claim 1 , wherein an end surface of the supporting portion away from the first diaphragm is flush with an end surface of the voice coil body away from the first diaphragm, or an end surface of the supporting portion away from the first diaphragm is not higher than an end surface of the voice coil body away from the first diaphragm.

9. The sound device of claim 1 , wherein an opening is further provided on a side wall of the supporting portion.

10. The sound device of claim 1 , wherein an avoiding hole is further provided on a side wall of the connecting portion.

11. The sound device of claim 1 , wherein:
the first diaphragm includes a center portion, a folding ring portion around the center portion, and a fixing portion around the folding ring portion; and
the center portion is a flat sheet structure, the folding ring portion is a structure composed of a protrusion, or the folding ring portion is a wave-shaped structure composed of at least one protrusion and at least one recess.

12. The sound device of claim 1 , wherein:
the second diaphragm includes a center portion, a folding ring portion around the center portion, and a fixing portion around the folding ring portion; and
the center portion is a flat sheet structure, the folding ring portion is a structure composed of a protrusion, or the folding ring portion is a wave-shaped structure composed of at least one protrusion and at least one recess.

13. A portable terminal, comprising a housing with a receiving cavity inside and the sound device of claim 1 , wherein the sound device is installed in the receiving cavity, the housing is defined with a first sound hole corresponding to the first diaphragm and a second sound hole corresponding to the second diaphragm.

14. The portable terminal of claim 13 , the housing includes a front surface and a back surface opposite to the front surface, the first sound hole is provided on the front surface, and the second sound hole is provided on the back surface.

Assignees

• Goertek Inc

Inventors

• Wang Xinglong
• Wang Jianjian
• Xu Tongyan
• Liu Chunfa

Classifications

• H04R1/345

  for loudspeakers · CPC title

• H04R9/06 Primary

  Loudspeakers · CPC title

• H04R1/025

  Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture · CPC title

• H04R7/18

  at the periphery · CPC title

• H04R9/025

  Magnetic circuit · CPC title