WO2019179201A1

WO2019179201A1 - Speaker module and electronic device

Info

Publication number: WO2019179201A1
Application number: PCT/CN2018/125462
Authority: WO
Inventors: 孙立国; 李兆鹏; 张允仓
Original assignee: 歌尔股份有限公司
Priority date: 2018-03-21
Filing date: 2018-12-29
Publication date: 2019-09-26
Also published as: CN108462918A; CN108462918B

Abstract

Disclosed are a speaker module and electronic device, relating to the technical field of electroacoustic conversion devices. A rear sound chamber of the speaker module has a cavity which has a port separated by means of a partition wall; a gap is formed between said cavity port and the inner wall of the housing of said module; the speaker module further comprises an air-permeable elastic member covering the cavity port; said air-permeable elastic member is fixed inside said gap by means of the compression of the inner wall of the module housing and the partition wall; the air-permeable elastic member comprises a hollow part running through the upper and lower surfaces thereof; the hollow part is in communication with the cavity and a filling space is thus collectively formed; said filling space is filled with a sound-absorbing material; in the present invention, the structure of the speaker module is improved, thus the fill amount of the sound-absorbing material is increased, improving the acoustic performance of the speaker module.

Description

Speaker module and electronic device

Technical field

The present invention relates to the field of electroacoustic conversion devices, and more particularly to a speaker module and an electronic device.

Background technique

In recent years, considering the factors of aesthetics and portability, the structure of electronic devices such as mobile phones and computers has been developing in the direction of “ultra-thin”. A speaker is a device that converts electrical energy into sound energy, and is widely used in electronic devices such as mobile phones and computers. In the prior art, when the speaker is assembled with the terminal device, it is usually required to place the speaker in the module housing and assemble it into the terminal device in the form of a speaker module. Under the trend of thinning and thinning electronic devices, the volume of the cavity in the module housing of the speaker module is also smaller and smaller.

In order to better utilize the performance of the speaker, it is necessary to make full use of the rear acoustic cavity of the existing speaker module. In the prior art, a side wall for partitioning is usually disposed in a module housing of the speaker module, and a gas permeable material such as a heat-fusible mesh cloth is closed above the side wall to close a filling space for forming a sound absorbing material, and the virtual space is enlarged. Cavity volume. However, if it is sealed with a material such as mesh cloth, the presence of the mesh cloth will occupy a certain space of the rear sound cavity, which limits the filling amount of the sound absorbing material in the filling space. Moreover, in order to ensure that the airflow can contact the sound absorbing material through the mesh cloth, it is necessary to form a certain slit between the mesh cloth and the module housing, which on the one hand reduces the utilization rate of the rear sound cavity, and on the other hand, is easy to cause The generation of resonance affects the acoustic performance of the speaker module.

Summary of the invention

An object of the present invention is to provide a speaker module, which improves the acoustic performance of the speaker module by improving the structure of the speaker module to increase the filling amount of the sound absorbing material. Another object of the present invention is to provide an electronic device.

In order to achieve the above object, the present invention adopts the following technical solutions:

A speaker module includes a module housing and a speaker disposed in the module housing, the speaker separating the inner cavity enclosed by the module housing into a front sound chamber and a rear sound chamber, the rear sound chamber having a cavity having a port separated by a partition wall, a gap formed between the cavity port and the inner wall of the module housing; the speaker module further includes a gas permeable elastic member covering the cavity port, the air permeability The piece is fixed in the gap by extrusion of the inner wall of the module casing and the partition wall; the gas permeable elastic member includes a hollow portion penetrating the upper and lower surfaces thereof, and the hollow portion communicates with the cavity to form a filling space. The filling space is filled with a sound absorbing material.

Preferably, the module housing includes a first housing and a second housing that is coupled to the first housing to form the inner cavity; the first housing is located at the bottom of the rear acoustic cavity The partition wall is disposed on the wall; the partition wall extends toward the second casing, and the gap is left between the partition and the second casing.

Preferably, the material of the gas permeable elastic member is sound absorbing foam.

Preferably, the thickness of the gas permeable elastic member is not less than the height of the gap.

Preferably, the gas permeable elastic member is bonded to the partition wall by bonding or heat fusion.

Preferably, the gas permeable elastic member is bonded to the inner wall of the module housing by bonding or heat fusion.

Preferably, the module housing corresponding to the filling space is provided with a filling port, and the filling port is covered with a sealing member.

Preferably, a wall corresponding to the gas permeable elastic member is formed on the module housing.

Preferably, the edge of the hollow portion of the gas permeable elastic member is located inside the inner side wall of the partition wall or flush with the inner side wall of the partition wall.

According to another object of the present invention, the present invention also provides an electronic device comprising the speaker module as described above.

The beneficial effects of the present invention are as follows:

In the speaker module of the present invention, a gas permeable elastic member having a hollow portion is disposed between the partition wall surrounding the filling space for forming the sound absorbing material and the inner wall of the module casing, and the gas permeable elastic member is received by the inner wall of the module casing and the partition wall. The extrusion is in a compressed state, and is fixed in a gap between the end surface of the partition wall and the inner wall of the module housing, and the partition wall, the air permeable elastic member and the module housing together form a filling space for filling the sound absorbing material, and enter the speaker module. The sound wave of the rear cavity can be contacted with the sound absorbing material through the permeable elastic member into the filling space. This design makes full use of the space of the sound cavity behind the speaker module, significantly increases the capacity of the sound absorbing material filling area, and increases the filling amount of the sound absorbing material. It is equivalent to increasing the airflow flow space in the rear sound cavity, effectively improving the sound quality adjustment function and improving the acoustic performance of the speaker module.

DRAWINGS

The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

1 is a cross-sectional view showing a specific embodiment of a speaker module of the present invention;

2 is an exploded view showing a specific embodiment of a speaker module of the present invention;

Reference numerals: 1, speaker, 200, front sound chamber, 201, rear sound chamber, 21, first housing, 210, filling port, 211, seal, 212, partition wall, 22, second housing, 220, leakage Hole, 221, damping, 3, sound-absorbing foam, 31, hollow, 4, sound-absorbing material, 5, flexible circuit board.

detailed description

In order to explain the present invention more clearly, the present invention will be further described in conjunction with the preferred embodiments and the accompanying drawings. Similar components in the drawings are denoted by the same reference numerals. It should be understood by those skilled in the art that the following detailed description is intended to be illustrative and not restrictive.

In the following description, for the purposes of illustration However, it is apparent that these embodiments may be practiced without these specific details. In other instances, well known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

1 is a cross-sectional view showing a specific embodiment of a speaker module of the present invention, and FIG. 2 is an exploded view showing a specific embodiment of a speaker module of the present invention.

As shown in FIG. 1 and FIG. 2, according to an aspect of the present invention, a speaker module is provided. The speaker module includes a module housing and a speaker 1 disposed in the module housing. The inner cavity enclosed by the module housing is divided into a front acoustic cavity 200 and a rear acoustic cavity 201. The rear acoustic cavity 201 has a cavity with a port separated by a partition wall 212, and the port and the inner wall of the module casing Forming a gap therebetween; the speaker module further includes a gas permeable elastic member covering the cavity port, the gas permeable elastic member being fixed in the gap by being pressed against the inner wall of the module casing and the partition wall 212; The gas permeable elastic member includes a hollow portion 31 penetrating through the upper and lower surfaces thereof, and the hollow portion 31 communicates with the cavity to form a filling space filled with the sound absorbing material 4. The partition wall 212 may be integrally formed by the module housing, or may be formed and then fixed to the inside of the module housing. Further, the bottom of the partition wall 212 may further extend into the partition wall 212. A bottom wall portion serving as a bottom surface of the filling space is formed, and the bottom wall portion is fixed to the module case.

In the preferred embodiment, the material of the gas permeable elastic member is a sound absorbing foam 3, and those skilled in the art should know that the gas permeable elastic member may also select other elastic compressible materials having a gas permeable function, and is not limited to the present invention. The sound absorbing foam 3 provided in the embodiment. Further, the thickness of the sound absorbing foam 3 is greater than the height of the gap, so that the sound absorbing foam 3 is in close contact with the inner wall of the module casing and the partition wall 212, so as to achieve sealing of the filling space and prevent occurrence of The gap causes the sound absorbing material to leak.

In a preferred embodiment, the sound absorbing material 4 is a particulate zeolite. It will be understood by those skilled in the art that in other embodiments of the present invention, the sound absorbing material 4 may also be selected from activated carbon or carbon nanotubes. The sound absorbing material 4 is disposed in the rear sound chamber 201, which can reduce the resonance frequency of the rear sound chamber 201, enhance the low frequency response, function similarly to expand the sound chamber 201, and improve the low frequency performance, thereby improving the acoustic performance of the speaker module.

Due to the development of electronic devices in the ultra-thin direction in recent years, the volume requirements of the speaker module are also getting higher and higher, and the volume of the rear acoustic cavity 201 of the speaker module is also smaller and smaller, and the filling space for filling the sound absorbing material 4 is also Therefore it is limited. In the technical solution provided by the embodiment of the present invention, the sound absorbing foam 3 having the hollow portion 31 is connected to the top end of the partition wall 212 and the inner wall of the module casing. When the speaker module is assembled, the sound absorbing foam 3 is fixed in the gap between the inner wall of the module casing and the partition wall 212, so that the sound absorbing foam 3, the partition wall 212 and the module casing are together A filling space for filling the sound absorbing material 4. At the same time, the sound waves from the speaker 1 can enter the filling space through the sound absorbing foam 3 to achieve contact with the sound absorbing material 4. Compared with the prior art, the solution significantly increases the capacity of the sound-absorbing material filling area, greatly reduces the product f0, and increases the expansion ratio of the sound absorbing material 4, which is equivalent to increasing the airflow flow space in the rear sound chamber 201. Effectively improve the low frequency response of the speaker module and improve the acoustic performance of the speaker module.

More specifically, as shown in FIG. 1 and FIG. 2, the module housing includes a first housing 21 and a second housing 22 that is coupled to the first housing 21 to form the inner cavity; The partition wall 212 of the first housing 21 on the bottom wall of the rear acoustic chamber 201 is disposed; the partition wall 212 extends toward the second housing 22, and the second housing 22 The gap is left between. For example, the partition wall 212 may be a wall extending from the bottom wall of the first casing 21 toward the second casing 22; the fence, the sound absorbing foam 3, and the first shell The body 21 and the second housing 22 together define a filling space. Specifically, the second housing 22 and the first housing 21 can be connected by an adhesive or glue. Of course, the first housing 21 and the first housing 21 can also be realized by a process such as ultrasonic welding. connection.

In a specific embodiment of the present invention, the sound absorbing foam 3 may be fixed in the gap by any one of the following two methods:

In the first embodiment, the sound absorbing foam 3 is first bonded to the top end surface of the partition wall 212 by bonding or hot melt. When the module housing is assembled, the pressing function of the second housing 22 is adopted. The sound absorbing foam 3 is fixed between the partition wall 212 and the second casing 22.

With this solution, the sound absorbing material 4 is filled in two ways: 1. The sound absorbing material 4 can be filled into the filling space before the first housing 21 and the second housing 22 are connected, and then passed through the second housing 22 The sealing of the filling space is achieved by the crimping; and the filling port 210 is formed on the module housing corresponding to the filling space, and the filling port 210 is covered with a sealing member 211. After the module is assembled, the sound absorbing material 4 is filled through the filling port 210, and then the sealing member 211 is covered at the filling port 210 to seal the filling space. It is to be understood by those skilled in the art that the filling port 210 can be selectively opened on the first housing 21 or on the second housing 22, which is not further limited in the present invention. The material of the sealing member 211 includes, but is not limited to, PET (Polyethylene terephthalate).

In the second embodiment, the sound absorbing foam 3 is first bonded to the inner wall of the module casing by bonding or hot fusion. When assembling the module casing, the sound absorbing foam is pressed by the partition wall 212. 3 is fixed between the partition wall 212 and the second casing 22. At this time, the filling of the sound absorbing material 4 needs to open a filling port 210 on the module casing corresponding to the filling space, and the filling port 210 is covered with a sealing member 211 to fill the sound absorbing material 4 as much as possible. After the module is assembled, the sound absorbing material 4 is filled through the filling port 210, and then the sealing member 211 is covered at the filling port 210 to seal the filling space. In the first and second aspects, the sound absorbing foam 3 is subjected to compression deformation in the gap by the pressing force of the inner wall of the module casing and the partition wall 212. In this way, the sound absorbing foam 3 is closely adhered to the inner wall of the second casing 22 or the partition wall 212 to avoid a gap between the sound absorbing foam 3 and the second casing 22 or the partition wall 212, and the sound absorbing material 4 is prevented from leaking into the sound absorbing material 4. The magnetic circuit system in the single speaker 1 is improved in the fastness of the sound absorbing foam 3.

In the preferred embodiment, the sound absorbing foam 3 includes a hollow portion 31 to further reduce the sound damping of the sound airflow through the sound absorbing foam 3 into the filling space of the sound absorbing material, thereby improving the utilization of the sound absorbing material. Further, the edge of the hollow portion 31 of the sound absorbing foam 3 is flush with the inner side wall of the partition wall 212, so as to facilitate the corresponding installation of the partition wall 212 and the sound absorbing foam 3. Of course, the edge of the hollow portion 31 of the sound absorbing foam 3 may also be located inside or outside the inner side wall of the partition wall 212. It should be noted, however, that the radial width of the annular sound absorbing foam 3 should not be too large or too small. When the width is too large, the space of the rear acoustic cavity 201 is occupied, and the volume of the filling space of the sound absorbing material is reduced; when the width is too small, it is difficult to provide the supporting force in the extending direction of the sound absorbing foam 3, and the deformation resistance of the sound absorbing foam 3 The ability is weakened, and it is easy to deform in the horizontal direction, which affects the sealing of the filling space.

Further, as shown in FIG. 2, a leakage hole 220 is disposed at a position of the module housing facing the rear acoustic cavity 201; the leakage hole 220 is covered with a damping 221 . Since the air in the rear sound chamber 201 is compressed or expanded, the leakage hole 220 is provided on the module housing to facilitate the circulation of air to balance the air pressure inside and outside the speaker module. Covering the damping 221 at the leak hole 220 may increase the acoustic resistance of the leak hole 220 to reduce the effect of the leak hole 220 on acoustic performance. Damping 221 includes, but is not limited to, a mesh.

Usually, the speaker in the speaker module needs to be electrically connected to an external circuit through a connection circuit, for example, to an external power supply circuit. In an achievable solution, the speaker module further includes: a flexible circuit board 5 (not shown); one end of the flexible circuit board 5 extends into the module housing and is electrically connected to the speaker The other end protrudes out of the module housing. The external circuit is electrically connected to the speaker by extending one end of the module housing.

The above speaker module can be a side sound speaker module or a positive sound speaker module. In practical applications, in order to improve the intermediate frequency characteristics or to achieve thinning and thinning of products such as mobile phones, the speaker module preferably adopts a side sounding mode.

In another achievable preferred embodiment of the present invention, a wall corresponding to the gas permeable elastic member is formed on the second casing, and both end surface surfaces of the gas permeable elastic member are respectively separated from the partition The wall is in close contact with the end face of the wall. An advantage of this design is that the breathable elastic member can be positioned in the middle of the rear acoustic chamber, and sound waves and air currents emitted from the speaker are more easily entered into the filling space to be in full contact with the sound absorbing material.

According to another aspect of the present invention, there is also provided an electronic device comprising the speaker module as described above. For the specific implementation of the speaker module, refer to related content in the foregoing embodiment, and details are not described herein again. The electronic device includes, but is not limited to, a mobile phone, a tablet, an MP3, and the like.

It is apparent that the above-described embodiments of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention, and those skilled in the art can also make the above description. It is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

A speaker module includes a module housing and a speaker disposed in the module housing, the speaker separating the inner cavity enclosed by the module housing into a front acoustic cavity and a rear acoustic cavity, wherein

The rear sound chamber has a cavity with a port separated by a partition wall, and a gap is formed between the cavity port and the inner wall of the module housing;

The speaker module further includes a gas permeable elastic member covering the cavity port, and the gas permeable elastic member is fixed in the gap by pressing the inner wall of the module casing and the partition wall;

The gas permeable elastic member includes a hollow portion penetrating the upper and lower surfaces thereof, and the hollow portion communicates with the cavity to form a filling space, and the filling space is filled with a sound absorbing material.
The speaker module according to claim 1, wherein the module housing comprises a first housing and a second housing that is coupled to the first housing to form the inner cavity;

The partition wall of the first housing on the bottom wall of the rear sound chamber;

The partition wall extends toward the second housing and the gap is left between the second housing and the second housing.
The speaker module according to claim 1, wherein the material of the gas permeable elastic member is sound absorbing foam.
The speaker module according to claim 1, wherein the thickness of the gas permeable elastic member is greater than the height of the gap.
The speaker module according to claim 1, wherein said gas permeable elastic member is bonded to said partition wall by bonding or heat fusion.
The speaker module according to claim 1, wherein the gas permeable elastic member is bonded to the inner wall of the module case by bonding or heat fusion.
The speaker module according to claim 1, wherein a filling port is formed in the module housing corresponding to the filling space, and the filling port is covered with a sealing member.
The speaker module according to claim 2, wherein the second casing forms a wall corresponding to the gas permeable elastic member.
The speaker module according to claim 1, wherein an edge of the hollow portion of the gas permeable elastic member is located inside the inner side wall of the partition wall or flush with the inner side wall of the partition wall.
An electronic device comprising the speaker module of any one of claims 1 to 9.