WO2018214280A1

WO2018214280A1 - Speaker module, and electronic apparatus

Info

Publication number: WO2018214280A1
Application number: PCT/CN2017/094690
Authority: WO
Inventors: 苏涛; 张军
Original assignee: 歌尔股份有限公司
Priority date: 2017-05-24
Filing date: 2017-07-27
Publication date: 2018-11-29
Also published as: CN107071668B; CN107071668A

Abstract

The present invention relates to a speaker module, and electronic apparatus. The speaker module comprises a housing (100), a speaker drive unit (200), at least one porous material frame (700), and sound absorbing particles (600). The speaker drive unit (200) divides an internal cavity of the housing (100) into a front acoustic cavity (400) and a rear acoustic cavity (300). The rear acoustic cavity (300) has a filling region (310) divided and formed by a divider wall (130). The at least one porous material framework (700) is fixedly arranged in the filling region (310) to occupy a portion of the space of the filling region (310), and sound absorbing particles (600) fill the other portion of the space of the filling region (310). The divider wall (130) has openings for ventilation.

Description

Speaker module and electronic equipment

Technical field

The invention belongs to the technical field of loudspeakers, and in particular to a speaker module and an electronic device having the same.

Background technique

The speaker module is an important acoustic device of electronic equipment, which is used to complete the conversion between electrical signals and acoustic signals, and is an energy conversion device. The speaker module comprises a module casing and a speaker unit housed in the casing. The speaker unit separates the inner cavity of the module casing into independent front and rear sound chambers, wherein the front sound chamber has a sound hole and the speaker module The group emits sound through the sound hole of the front sound cavity, and then the sound cavity is relatively closed, and usually communicates with the outside through the orifice only. The design of the rear sound cavity is crucial for the acoustic performance of the speaker module.

At present, designers usually set the sound absorbing material in the rear sound cavity of the speaker module to reduce the resonant frequency (F0) of the speaker module, improve the smoothness of the intermediate frequency response curve, improve the low frequency response, and expand the bandwidth.

As a sound absorbing material, sound absorbing particles have been applied to the speaker module. Due to the fluidity of the sound absorbing particles, the rear cavity of the speaker module is designed with a receiving groove to accommodate the sound absorbing particles. When the sound absorbing particles are disposed, the sound absorbing particles are first filled into the accommodating groove, and then the accommodating groove is sealed by the mesh cloth to ensure the airflow of the accommodating groove while restricting the flow of the sound absorbing particles to the area other than the accommodating groove. Circulation.

For the speaker module of this structure, there are the following problems:

1. Based on the same sound-absorbing particle filling structure, the larger the filling amount of the sound-absorbing particles, the better the sound-absorbing effect, which means that filling the sound-absorbing particles in some areas of the receiving groove can play the sound absorbing effect, and filling the sound-absorbing particles in some areas. Not only does not have a sound-absorbing effect but it will be counterproductive.

2. Based on the same sound absorbing particle filling structure and the same sound absorbing particle filling amount, the sound absorbing particles are located at different positions and have different sound absorbing effects.

Thus, in order to obtain a better sound absorbing effect, it is highly desirable to provide a structure to control the distribution position of the sound absorbing particles.

Summary of the invention

It is an object of embodiments of the present invention to provide a speaker module that is capable of controlling the distribution of sound absorbing particles.

According to an aspect of the present invention, a speaker module includes a module housing, a speaker unit, at least one porous material frame, and sound absorbing particles, and the speaker unit separates a cavity of the module housing into a front acoustic cavity and a rear acoustic cavity; the rear acoustic cavity has a filling area partitioned by a partition wall, the at least one porous material frame being fixedly disposed in the filling area to occupy a part of the space of the filling area, the sound absorbing particle Filled in another portion of the space of the filling region, the partition wall has air holes for airflow.

Optionally, the dividing wall comprises a mesh, and the air hole comprises a mesh of the mesh.

Optionally, at least a portion of the dividing wall is integrally formed with the module housing.

Optionally, the at least one of the porous material frames is disposed such that the pores directly lead to the sound absorbing particles.

Optionally, at least a portion or a majority of the at least one of the porous material frames are fixedly disposed at a position of the partition wall away from the speaker unit.

Alternatively, the porous material frame is made of sound absorbing cotton, porous ceramic, foam or foam glass.

Optionally, at least a portion of the at least one of the porous material frames is a hollow structure.

Optionally, the speaker unit has a diaphragm through which the speaker unit separates the inner cavity of the module housing into the front acoustic cavity and the rear acoustic cavity.

Optionally, the sound absorbing particles are non-foaming sound absorbing particles.

According to a second aspect of the present invention, there is also provided an electronic device comprising the speaker module according to the first aspect of the present invention.

One technical effect of the present invention is that the speaker module of the present invention is fixedly provided with a porous material frame in the filling region, and the porous material frame can restrict the flow of the sound absorbing particles, thereby controlling The distribution position of the sound absorbing particles; moreover, although the porous material frame occupies the position of the rear acoustic cavity, it does not substantially affect the volume of the space in the rear acoustic cavity for airflow, and ensures the maximum design of the airflow circulation space in the rear acoustic cavity. The structure of the present invention can effectively improve the acoustic performance of the speaker module.

Other features and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

DRAWINGS

The accompanying drawings, which are incorporated in FIG.

1 is a front elevational view of an embodiment of a speaker module in accordance with the present invention;

Figure 2 is a cross-sectional view taken along line A-A of Figure 1;

3 is a schematic exploded view of the speaker module of FIG. 1.

Description of the reference signs:

100-module casing; 110-module upper casing;

120-module lower case; 121-leak hole;

200-speaker unit; 210-diaphragm;

300-rear cavity; 310-filled area;

130-partition wall; 131-mesh;

400-front acoustic cavity; 500-circuit board (FPCB);

600-absorbent particles; 700-porous material frame;

900-damper.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in the embodiments are not intended to limit the scope of the invention unless otherwise specified.

The following description of the at least one exemplary embodiment is merely illustrative and is in no way

Techniques and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques and devices should be considered as part of the specification.

In all of the examples shown and discussed herein, any specific values are to be construed as illustrative only and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in one figure, it is not required to be further discussed in the subsequent figures.

1 to 3 are schematic views showing the structure of an embodiment of a speaker module according to the present invention.

According to FIGS. 1 to 3, the speaker module includes a module housing 100, a speaker unit 200, at least one porous material frame 700, and sound absorbing particles 600.

The module housing 100 can include a separately formed module upper housing 110 and a module lower housing 120 that are fixedly coupled together to form the module housing 100 when the speaker module is assembled. This aspect facilitates the molding of the module housing 100 and, on the other hand, facilitates assembly of the speaker module.

The module upper case 110 and the module lower case 120 can be obtained, for example, by means of injection molding.

The module upper case 110 and the module lower case 120 may be fixedly coupled together by, for example, at least one of bonding, fastener connection, ultrasonic welding, or the like.

The speaker unit 200 is housed in the module housing 100, and the inner cavity of the module housing 100 is separated into mutually independent front and

rear sound chambers

400 and 300 by cooperation with the module housing 100.

In this embodiment, the speaker unit 200 has a diaphragm 210 that vibrates through the diaphragm 210 to motivate the surrounding air to sound. The speaker unit 200 specifically divides the inner cavity of the module housing 100 into mutually independent front and rear

acoustic chambers

400 and 300 through the diaphragm 210.

Such a speaker unit 200 is, for example, a single body of a moving coil type structure.

The front acoustic cavity 400 is an acoustic cavity having an acoustic hole, and the speaker module emits sound through the sounding hole of the front acoustic cavity 400.

The rear acoustic cavity 300 is a relatively closed acoustic cavity, and the rear acoustic cavity 300 can communicate with the outside through the orifice only to balance the internal and external sound pressure.

The damper hole may be formed by covering the damper member 900 on the leak hole 121 of the external sound chamber 300 and the outside.

The damper 900 may be, for example, a mesh or the like.

In this embodiment, the leak hole 121 is provided on the module lower case 120.

In another embodiment, the leakage hole 121 may also be disposed on the module upper case 110 as long as the sound cavity 300 can communicate with the outside through the leakage hole 121.

As shown in FIG. 2, the rear acoustic cavity 300 has a filling area 310 separated by a partition wall 130.

The partition wall 130 has air holes for airflow to allow airflow generated in the rear sound chamber 300 due to vibration of the speaker unit 200 to enter the filling region 310.

The partition wall 130 may include a mesh 131 including the mesh of the mesh 131.

Further, the partition wall may further include a plastic wall body that forms a groove body having an opening by a plastic wall body, and the groove body is sealed by the mesh cloth 131 to form a filling region 310.

At least a portion of the partition wall 130 may be integrally formed with the module housing 100. For example, one-shot molding.

At least one porous material frame 700 is fixedly disposed in the filling region 310 to occupy a portion of the space of the filling region.

The sound absorbing particles 600 are filled in another portion of the space of the filling region 310.

The number of porous material frames 700 can be determined according to the desired distribution position of the sound absorbing particles 600 and the shape of the frame.

The porous material frame 700 can be fixed in the filling region 310, for example, by double-sided adhesive bonding.

The porous material frame 700 can be made, for example, of sound absorbing cotton, porous ceramic, foamed plastic, or foamed glass.

The function of the porous material frame 700 is to restrict the flow of the sound absorbing particles 600 by occupying the position of the filling region 310, thereby restricting the distribution position of the sound absorbing particles 600 according to the design; providing pores for the airflow to ensure the permeability of the airflow, and further The effect of occupying the space through the porous material frame 700 without affecting the volume of space in the rear acoustic cavity for airflow is obtained.

In at least one of the above porous material frames 700, at least a portion of the porous material frame 700 may be a hollow structure to minimize the occupation of the space volume of the porous material frame 700 for the airflow in the rear acoustic cavity.

The porosity of the porous material frame 700 can be, for example, greater than or equal to 30%, and can be further greater than or equal to 60%.

The pore size of the porous material frame can be, for example, greater than or equal to 1 um.

In the embodiment in which the porous material frame 700 is made of sound absorbing cotton, since the sound absorbing cotton itself also has a sound absorbing effect, the porous material frame 700 is provided to enhance the sound absorbing effect while performing the above functions.

The distribution position of the sound absorbing particles 600 may be such that the improvement in acoustic performance by sound absorption is greater than the adverse effect on the acoustic performance of the space volume occupying the rear sound chamber 300. Thus, when the sound absorbing particles 600 are filled in the rear sound chamber 300, the effect of improving the acoustic performance can be comprehensively obtained, for example, reducing the resonance frequency (F0) of the speaker module, improving the smoothness of the intermediate frequency response curve, and improving the low frequency response. And expand the bandwidth.

In addition, the structure for controlling the distribution position of the sound absorbing particles 600 by providing the porous material frame 700 can also reduce the amount of the sound absorbing particles 600, thereby improving the acoustic performance while reducing the product cost.

Corresponding to the above-described distribution position of the sound absorbing particles 600, the porous material frame 700 is disposed such that the pores of the partition wall 130 directly lead to the sound absorbing particles 600. This indicates that the porous material frame 700 is not in contact with the pores, but has a space for accommodating the sound absorbing particles 600 with the pores to increase the specific gravity of the sound absorbing particles 600.

Corresponding to the above-described distribution position of the sound absorbing particles 600, the position of the porous material frame 700 may also be further such that at least a part or a majority of the at least one porous material frame 700 is fixedly disposed at a position away from the speaker unit 200 of the filling region 310. In order to make the sound absorbing particles 600 more located close to the speaker unit 200, thereby increasing the specific gravity of the sound absorbing particles 600 for sound absorption.

The meaning of the distance is: determining the closest distance and the farthest distance between the filling area 310 and the speaker unit 200, and further determining the intermediate distance; the closest distance between the porous material frame 700 and the speaker unit 200 is greater than or equal to the intermediate distance In the meantime, the porous material frame 700 is disposed at a position away from the speaker unit 200.

The sound absorbing particles 600 may be, for example, non-foaming sound absorbing particles to obtain a desired acoustic effect by designing the pores.

The sound absorbing particles 600 are, for example, zeolite particles or the like.

According to another aspect of the present invention, there is also provided an electronic device including Any of the above speaker modules.

The electronic device can be, for example, a mobile phone, a tablet, a smart wearable device, or the like.

The above embodiments mainly focus on the differences from the other embodiments, but it should be apparent to those skilled in the art that the above embodiments may be used alone or in combination with each other as needed.

While the invention has been described in detail with reference to the specific embodiments of the present invention, it should be understood that It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

A speaker module, comprising a module housing (100), a speaker unit (200), at least one porous material frame (700), and sound absorbing particles (600), wherein the speaker unit (200) The inner cavity of the module housing (100) is divided into a front acoustic cavity (400) and a rear acoustic cavity (300); the rear acoustic cavity (300) has a filling area (310) separated by a partition wall (130), At least one porous material frame (700) is fixedly disposed in the filling region (310) to occupy a portion of the filling region (310), and the sound absorbing particles (600) are filled in the filling region (310) In another portion of the space, the partition wall (130) has air holes for airflow.
The speaker module according to claim 1, wherein the partition wall (130) comprises a mesh (131), and the air hole comprises a mesh of the mesh (131).
The speaker module according to claim 1 or 2, characterized in that at least a part of the partition wall (130) is integrally formed with the module housing (100).
The speaker module according to any one of claims 1 to 3, wherein the at least one porous material frame (700) is disposed such that the air holes directly lead to the sound absorbing particles (600) .
The speaker module according to any one of claims 1 to 4, characterized in that at least a part or a majority of the at least one porous material frame (700) is fixedly disposed away from the speaker unit (200) ) on the location.
The speaker module according to any one of claims 1 to 5, characterized in that the porous material frame (700) is made of sound absorbing cotton, porous ceramic, foamed plastic or foam glass.
A speaker module according to any one of claims 1 to 6, wherein at least a portion of said at least one of said porous material frames (700) is a hollow structure.
The speaker module according to any one of claims 1 to 7, characterized in that the speaker unit (200) has a diaphragm (210) through which the speaker unit (200) passes ( 210) separating the inner cavity of the module housing (100) into the front acoustic cavity (400) and The rear sound chamber (300).
The speaker module according to any one of claims 1 to 8, characterized in that the sound absorbing particles (600) are non-foaming sound absorbing particles.
An electronic device comprising the speaker module according to any one of claims 1 to 9.