CN108174332B

CN108174332B - Loudspeaker module

Info

Publication number: CN108174332B
Application number: CN201810085823.7A
Authority: CN
Inventors: 徐增强; 褚勇
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2018-01-29
Filing date: 2018-01-29
Publication date: 2020-08-25
Anticipated expiration: 2038-01-29
Also published as: CN108174332A

Abstract

The invention discloses a loudspeaker module, which comprises a shell, wherein a loudspeaker monomer is contained in the shell, the loudspeaker monomer divides the inner cavity of the whole module into a front sound cavity and a rear sound cavity, a sound-absorbing metal part is combined on the shell, the sound-absorbing metal part comprises a metal sheet and a porous sound-absorbing layer positioned on the surface of the metal sheet, and at least part of the porous sound-absorbing layer is exposed in the rear sound cavity. The technical scheme of the invention solves the problems of unsmooth flow of sound cavity airflow, noise and the like in the use of the existing loudspeaker module, particularly the loudspeaker module comprising the miniature loudspeaker with an irregular shape, and widens the application range of the loudspeaker module.

Description

Loudspeaker module

Technical Field

The invention relates to the technical field of electroacoustic products. And more particularly, to a speaker module.

Background

The speaker module is an important acoustic component of the portable electronic device, is used for completing the conversion between an electric signal and a sound signal, and is an energy conversion device. Existing loudspeaker modules typically include a housing in which a vibration system and a magnetic circuit system are housed. The vibrating system comprises a vibrating diaphragm and a voice coil which are fixed together, the magnetic circuit system comprises a magnetic yoke, a magnet and a washer which are sequentially fixed on the magnetic yoke, and the vibrating diaphragm divides the inner cavity of the whole loudspeaker module into a front sound cavity and a rear sound cavity. In order to adjust the acoustic performance better and expand the bandwidth, a person skilled in the art usually sticks sound-absorbing cotton or fills sound-absorbing particles in the rear sound cavity. However, as the requirement on the acoustic performance of the speaker module is higher and the shape of the speaker module is more and more irregular, the irregular shape affects the addition of the sound-absorbing cotton or the sound-absorbing particles, so that the acoustic performance of the product is difficult to debug and the performance is not ideal. And the sound-absorbing cotton regularly arranged can cause unsmooth airflow of the sound cavity to form noise.

Therefore, it is desirable to provide a new speaker module structure to solve the above problems.

Disclosure of Invention

The invention aims to provide a loudspeaker module to solve the problems of unsmooth airflow flow of an acoustic cavity, noise and the like in the use process of the conventional loudspeaker module, particularly the loudspeaker module comprising a miniature loudspeaker with an irregular shape.

In order to achieve the purpose, the invention provides a loudspeaker module, which comprises a shell, wherein a loudspeaker monomer is contained in the shell, the loudspeaker monomer divides the inner cavity of the whole module into a front sound cavity and a rear sound cavity, and a sound-absorbing metal part is combined on the shell; the sound-absorbing metal part comprises a metal sheet and a porous sound-absorbing layer positioned on the surface of the metal sheet, wherein at least part of the porous sound-absorbing layer is exposed in the rear sound cavity.

Preferably, the porous sound absorbing layer is a porous alloy layer.

Preferably, the porous sound-absorbing layer is formed on the surface of the metal sheet in a form of being sintered after spraying.

Preferably, the material of the porous alloy layer is selected from a copper alloy or an aluminum alloy.

Preferably, the sound-absorbing metal member is injection-molded as an insert with the housing.

Preferably, the sound-absorbing metal member is bonded to an inner wall of the housing, and the porous sound-absorbing layer is formed on a surface of the metal sheet facing the rear sound chamber.

Preferably, the housing comprises at least a first shell and a second shell which are combined and fixed together; the second housing and the speaker unit form the rear acoustic chamber.

Preferably, the second casing includes a bottom wall portion and a side wall portion, and the porous sound absorbing layer is exposed to the bottom wall portion and/or the side wall portion of the second casing and faces the rear sound cavity.

Preferably, a third housing is further included; the first shell, the loudspeaker single body and part of the second shell jointly enclose the front sound cavity, and the loudspeaker single body, the third shell and part of the second shell jointly enclose the rear sound cavity.

Preferably, the porous sound absorbing layer is exposed to the bottom wall portion and/or the side wall portion of the second casing and/or the third casing and faces the rear sound cavity.

The invention has the following beneficial effects:

according to the object of the invention, in the technical scheme of the speaker module provided by the invention, the module shell is combined with the speaker module which comprises the metal sheet and the porous sound absorption layer positioned on the surface of the metal sheet, the metal sheet is embedded into the shell, and at least part of the porous sound absorption layer is exposed in the rear sound cavity, so that the speaker module with stable structure and good sound production effect is obtained, and the speaker module can be a micro speaker module which has the problems of no air flow unsmooth flow, resonance, noise and the like in the sound cavity when in use.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 shows an exploded view of a speaker module in accordance with an embodiment of the present invention.

Figure 2 shows a cross-sectional view of a portion of a housing of a speaker module in accordance with one embodiment of the present invention.

Fig. 3 shows a partial enlarged view of a cross-sectional view of the structure of fig. 2.

Detailed Description

In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

One embodiment of the present invention provides a speaker module, as shown in fig. 1-3, the speaker module includes a housing 11 (upper housing, bottom housing), 12 (middle housing, bottom housing) and 13 (bottom housing ), a speaker unit is accommodated in the

housing

11,12 and 13, and the speaker unit divides the inner cavity of the whole module into two cavities, namely a front sound cavity and a rear sound cavity. In this embodiment, the front acoustic chamber is formed by the speaker unit and the housing 11 and part of the housing 12, while the rear acoustic chamber is formed by the speaker unit and part of the housing 12 and the housing 13.

The sound-absorbing metal member 2 is injection-molded to the

outer cases

12 and 13, and the sound-absorbing metal member 2 includes a metal sheet 21 and a porous sound-absorbing layer 22 on a surface of the metal sheet 21, at least a part of the porous sound-absorbing layer 22 being exposed to the rear sound cavity.

In the speaker module of this embodiment, the housing of the speaker module is made of plastic and is obtained by injection molding. In addition, the structure of the speaker unit in this embodiment may be a structure known in the art, for example, as shown in fig. 1, the speaker unit includes a magnetic circuit system and a vibration system, the vibration system includes a diaphragm 3 and a voice coil 4 fixedly connected to the diaphragm 3, the magnetic circuit system includes a central magnet 6, a central clamp plate 5 and a magnetic yoke 7, and the central magnet 6 is fixedly combined with the top surface of the bottom wall of the magnetic yoke 7. The detailed structure is not described herein.

In this embodiment, the sound-absorbing metal member includes a metal sheet and a porous sound-absorbing layer on a surface of the metal sheet. Wherein, the metal sheet can be a metal shrapnel, and the firm combination of the metal sheet and the porous sound absorption layer can better improve the stability of the obtained structure.

Since the metal sheet is bonded to the inner wall of the housing in this embodiment, the porous sound absorbing layer can be located on the side of the metal sheet facing the rear cavity after molding, which is equivalent to the inner wall of the housing of the module being given sound absorbing properties. When the loudspeaker module is used, redundant sound wave energy can be absorbed, the airflow of the sound cavity is smooth, and no noise exists. In addition, the sound-absorbing metal member can prevent the sound wave energy from impacting the thin wall of the shell when the thickness of the shell is too thin, so that the thin wall resonates to form noise and generate resonance. Furthermore, the design of the structure enables the loudspeaker module to still have good sound production effect even if the loudspeaker module is of a micro structure and the shape of the voice coil in the loudspeaker monomer in the micro structure is complex.

In a preferred example, the porous sound-absorbing layer 22 is a porous alloy layer. The material of the porous alloy layer is selected mainly from alloys having good conductivity, good strength and good attractiveness. For example, the material of the porous alloy layer includes, but is not limited to, copper alloy or aluminum alloy.

In still another preferred example, the porous sound-absorbing layer 22 is formed on the surface of the metal sheet 21 by a form of sintering after spraying. The porous sound absorption layer 22 is formed by sintering after spraying and is combined on the surface of the metal sheet 21, on one hand, the porous sound absorption layer 22 which is uniformly distributed and compact in structure can be obtained, more sound wave energy can be better absorbed, on the other hand, the formed porous sound absorption layer 22 and the metal sheet 21 can be firmly combined, the phenomena that the sound absorption layer falls off and the like in the long-term use process of the structure are prevented, the consistency of the product and the acoustic performance of the product are effectively improved, and the use precision and the service life of the product are improved.

More specifically, the sound-absorbing metal member 2 is formed by a method including, but not limited to: alloy powder is sprayed on the surface of the metal sheet 21, and then the metal sheet is sintered at the high temperature of 1000-1300 ℃, so that the porous sound absorption layer 22 firmly combined with the metal sheet 21 is formed on the surface of the metal sheet 21.

In a preferred example, the porous sound absorbing layer 22 exposed within the or the rear sound cavity is adapted to the inside surface of the

housing

12 and 13 forming the rear sound cavity. That is, the porous sound absorbing layer 22 has a structure corresponding to that of the rear sound cavity portion in which it is located. That is, the porous sound-absorbing layer 22 is provided on the inner side surfaces of the

housings

12 and 13 forming the rear sound chamber. At this time, the exposed porous sound absorbing layer 22 can absorb the excess sound wave energy more comprehensively and completely without affecting the airflow of the product, thereby improving the acoustic performance.

In general, the housing constituting the speaker module comprises at least a first housing and a second housing, and the above embodiment shows a case of simultaneously comprising a third housing, as mentioned above, in this case, the rear sound cavity is specifically formed by the speaker unit and a part of the housing 12 and the housing 13, so that the porous sound absorbing layer 22 can be exposed on the bottom wall portion and/or the side wall portion of the second housing (the housing 12) and/or the third housing (the housing 13) and faces the rear sound cavity. That is, the porous sound absorbing layer 22 may be provided only on the casing 12, only on the casing 13, or both of the casing 12 and the casing 13; the present invention can be applied to a case in which a housing is mounted on a vehicle, and a case in which a housing is mounted on a vehicle. In other words, the porous sound absorbing layer 22 may be exposed to all the inner walls of the shell forming the rear sound cavity and face the rear sound cavity, or may be disposed only partially.

In another structure not shown in the present embodiment, the casing includes two parts, namely, a first casing and a second casing, and in this case, the rear sound chamber is generally formed by a space between the second casing and the speaker unit, and similarly, the porous sound absorbing layer 22 may be provided only on the bottom wall portion of the second casing, only on the side wall portion of the second casing, or both the bottom wall portion and the side wall portion of the second casing.

No matter what kind of module structure and what kind of mode of setting of adoption above, for better reaching this technical scheme's purpose, the equal preferred shaping in the one side of the back sound cavity of sheetmetal 21 of porous sound absorbing layer 22.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.

Claims

1. The loudspeaker module comprises a shell, a loudspeaker monomer is accommodated in the shell, the loudspeaker monomer divides the inner cavity of the whole module into a front sound cavity and a rear sound cavity, and the loudspeaker module is characterized in that,

the shell is combined with a sound-absorbing metal part; the sound-absorbing metal part comprises a metal sheet and a porous sound-absorbing layer positioned on the surface of the metal sheet, wherein at least part of the porous sound-absorbing layer is exposed in the rear sound cavity; the porous sound absorbing layer is a porous alloy layer, and is formed on the surface of the metal sheet in a form of being sprayed and then sintered.

2. The speaker module as claimed in claim 1, wherein the porous alloy layer is made of a material selected from a copper alloy and an aluminum alloy.

3. The speaker module as claimed in claim 1, wherein the sound absorbing metal member is injection molded as an insert with the housing.

4. The speaker module as claimed in claim 1, wherein the sound absorbing metal member is bonded to an inner wall of the housing, and the porous sound absorbing layer is formed on a surface of the metal sheet facing the rear sound chamber.

5. The speaker module as recited in claim 1, wherein the enclosure comprises at least a first housing and a second housing secured together in combination; the second housing and the speaker unit form the rear acoustic chamber.

6. The speaker module as claimed in claim 5, wherein the second housing comprises a bottom wall portion and a side wall portion, and the porous sound absorbing layer is exposed from the bottom wall portion and/or the side wall portion of the second housing and faces the rear sound cavity.

7. The speaker module as recited in claim 5, further comprising a third housing; the first shell, the loudspeaker single body and part of the second shell jointly enclose the front sound cavity, and the loudspeaker single body, the third shell and part of the second shell jointly enclose the rear sound cavity.

8. The speaker module as claimed in claim 7, wherein the porous sound absorbing layer is exposed from the bottom wall portion and/or the side wall portion of the second housing and/or the third housing and faces the rear sound cavity.