Sound production device and portable terminal

Patent metadata

Field	Value
Publication number	US-11516588-B2
Application number	US-201817256279-A
Country	US
Kind code	B2
Filing date	Dec 29, 2018
Priority date	Jun 25, 2018
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

Disclosed in the present invention are a sound generation device and a portable terminal. The sound generation device comprises a vibration system and a magnetic circuit system, the vibration system and the magnetic circuit system being mounted and fixed to an housing. The housing comprises a first shell and a second shell that are connected and fixed together, the vibration system comprises a first diaphragm and the magnetic circuit system comprises a magnetic yoke, and wherein the first diaphragm is mounted on one surface of the first shell far away from the second shell, and the magnetic yoke and the second shell are injection molded as an integrated part. In the sound generation device of the present invention a conventional plastic housing is split into two shells, by fixing the magnetic yoke to the second shell by injection molding so that the magnetic yoke and the second shell become an independent part which is integrally arranged, it can reduce the assembling process of the Magnetic yoke and the housing, improve the assembling efficiency and connecting strength of the sound generation device, and can provide a bigger space for the magnetic circuit system and improve the product performance.

First claim

The invention claimed is:

1. A sound production device, comprising a vibration system and a magnetic circuit system, the vibration system and the magnetic circuit system being mounted and fixed to a housing,
wherein the housing comprises a first shell and a second shell connected and fixed together;
the vibration system comprises a first diaphragm, mounted on a first surface of the first shell distal from the second shell; and
the magnetic circuit system comprises a magnetic yoke,
wherein the magnetic yoke and the second shell are injection molded as an integrated part, and

wherein the magnetic circuit system further comprises a central magnetic circuit portion and a side magnetic circuit portion, and the central magnetic circuit portion and the side magnetic circuit portion form a magnetic gap therebetween;
the central magnetic circuit portion comprises a central magnet arranged on the magnetic yoke and a central concentrating flux plate arranged on the central magnet, the side magnetic portion comprises a side concentrating flux plate arranged separated from the central concentrating flux plate, and the side concentrating flux plate is fixed to the first shell by injection molding.

2. The sound production device according to claim 1 , wherein the side magnetic circuit portion further comprises a first side magnet arranged on a first side of the central magnet and a second side magnet arranged on a second side of the central magnet, and the side concentrating flux plate comprises a first side concentrating flux plate arranged on the first side magnet and a second side concentrating flux plate arranged on the second side magnet.

3. The sound production device according to claim 2 , wherein the magnetic yoke is in a flat plate shape and is arranged to form a bottom wall of the second shell.

4. The sound production device according to claim 3 , wherein a portion of the first shell facing the second shell is provided with a recess/protrusion structure, and a portion of the second shell facing the first shell is provided with a matching protrusion/recess structure; and wherein the first shell and the second shell are positioned through the matching protrusion and recess structures, and the first shell and the second shell are bonded and fixed together by glue.

5. The sound production device according to claim 1 , wherein the first shell is provided with a first electric connector and a second electric connector for electrically connecting a voice coil of the vibration system to an external circuit, and the first electric connector is connected to a first lead of the voice coil of the vibration system, and the second electric connector is connected to a second lead of the voice coil of the vibration system.

6. The sound production device according to claim 5 , wherein the first shell is configured in a rectangular shape, and the first electric connector and the second electric connector are configured at an end of a short edge of the first shell.

7. The sound production device according to claim 6 , wherein the end of the short edge of the first shell protrudes outwardly with a mounting protrusion portion;
the first electric connector is provided with a first bonding pad and a second bonding pad that are exposed on the mounting protrusion portion and located on an inner side of the first shell; and the second electric connector is provided with a third bonding pad and a fourth bonding pad that are exposed on the mounting protrusion portion and located on the inner side of the first shell; and
the first bonding pad and the third bonding pad are electrically connected to an external circuit.

8. The sound production device according to claim 7 , wherein the first shell is further provided with a third electric connector and an electric adapter having first and second ends, the third electric connector arranged on one end of the first shell distal from the mounting protrusion portion, and wherein the first end of the electric adapter is connected to the third electric connector and the second end of the electric adapter is connected to the second electric connector; and wherein
one of the first lead and the second lead of the voice coil is electrically connected to the second electric connector by passing through the third electric connector and the electric adapter sequentially while a different one of the first lead and the second lead of the voice coil is electrically connected to the first electric connector.

9. The sound production device according to claim 8 , wherein the third electric connector is provided with a fifth bonding pad exposed. on an upper side surface of the first shell and a sixth bonding pad exposed on a lower side surface of the first shell, the second bonding pad being exposed on the upper side surface of the first shell, the fourth bonding pad being exposed on the lower side surface of the first shell, and the sixth bonding pad and the fourth bonding pad being arranged close to the same long edge of the first shell;
two ends of the electric adapter are connected to the sixth bonding pad and the fourth bonding pad respectively;
two leads of the voice coil are connected to the fifth bonding pad and the second bonding pad respectively.

10. The sound production device according to claim 9 , wherein the lower side surface of the first shell is provided with a lead slot extending from the sixth bonding pad to the fourth bonding pad, the electric adapter being buried in the lead slot.

11. The sound production device according to claim 1 , wherein the vibration system further comprises a second diaphragm arranged opposite to the first diaphragm, the second diaphragm mounted on a surface of the second shell distal from the first shell, and the voice coil of the vibration system arranged on a lower side of the first diaphragm;
the magnetic circuit system is arranged between the first diaphragm and the second diaphragm, the magnetic circuit system and the first diaphragm form a first sound cavity therebetween, and the voice coil partially extending into the magnetic gap of the magnetic circuit system, and the magnetic circuit system and the second diaphragm form a second sound cavity therebetween, and the first sound cavity and the second sound cavity are provided with a gas port therebetween.

12. The sound production device according to claim 11 , wherein the sound production device further comprises a connector, the connector being at least partially arranged in the gas port, being fixedly connected to the first diaphragm with an upper end of the connector and being fixedly connected to the second diaphragm with a lower end of the connector.

13. The sound production device according to claim 12 , wherein the gas port comprises a plurality of side gas ports disposed in the second shell, being in communication with the magnetic gap of the magnetic circuit system to the second sound cavity, and being spaced apart along a circumferential direction of the magnetic gap;
the connector comprises a connecting bottom plate and a plurality of connecting protrusion portions protruding from the connecting bottom plate, the connecting bottom plate being arranged between the second shell and the second diaphragm and being fixedly connected to the second diaphragm, and the plurality of connecting protrusion portions passing through the side gas ports in a one-to-one correspondence manner to be fixedly connected to the first diaphragm.

14. The sound production device according to claim 13 , wherein the connecting protrusion portions are arranged in plate shapes, and wherein the connecting protrusions and/or connecting bottom plate are selected

Assignees

• Goertek Inc

Inventors

• Wang Xinglong
• Ge Lianshan
• Liu Chunfa

Classifications

• H04R2499/11

  Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's · CPC title

• H04R7/04

  Plane diaphragms · CPC title

• H04R9/025 Primary

  Magnetic circuit · CPC title

• H04R9/06

  Loudspeakers · CPC title

• H04R1/021

  incorporating only one transducer · CPC title