CN111147967A

CN111147967A - Loudspeaker module and preparation method thereof

Info

Publication number: CN111147967A
Application number: CN202010104971.6A
Authority: CN
Inventors: 赵洪强; 袁世明; 王庆依
Original assignee: KING TONE INNOVATION
Current assignee: KING TONE INNOVATION
Priority date: 2020-02-20
Filing date: 2020-02-20
Publication date: 2020-05-12

Abstract

In the embodiment of the invention, the elastic isolation device is arranged in the shell, so that the elastic material in the second cavity is arranged compactly, sound absorption particles cannot vibrate and rub along with air flow when the loudspeaker vibrates, and the performance of the loudspeaker module can be improved.

Description

Loudspeaker module and preparation method thereof

Technical Field

The invention relates to the technical field of electronic products, in particular to a loudspeaker module and a manufacturing method of the loudspeaker module.

Background

A speaker module is a device for converting electrical energy into sound energy, and a conventional speaker module generally includes a housing and an electroacoustic transducer, wherein the housing includes a first cavity for accommodating the electroacoustic transducer and a second cavity for accommodating a sound-absorbing material. The low-frequency performance of the loudspeaker module can be improved by arranging the sound-absorbing material in the shell.

However, the existing speaker module structure filled with sound-absorbing material has the defects of low filling efficiency, insufficient arrangement of sound-absorbing material, and the like. Therefore, the sound quality of the speaker module is poor, and the performance of the speaker module is affected. Therefore, the structure of the speaker module is still to be improved.

Disclosure of Invention

In view of this, the present invention provides a speaker module to improve the performance of the speaker module.

In a first aspect, an embodiment of the present invention provides a speaker module, where the speaker module includes:

an electro-acoustic conversion device;

a sound absorbing material;

a housing;

the isolation device is used for dividing the shell into a first cavity for containing the electroacoustic conversion device and a second cavity for containing the sound-absorbing material;

wherein the isolation device has elasticity.

Preferably, the isolation device comprises a resilient zone formed from a resilient material.

Preferably, the elastic region of the isolation device protrudes to one side of the first cavity.

Preferably, the isolation device further comprises a sound emitting area made of a breathable material;

wherein the elastic zone is an annular zone surrounding the sound-emitting zone.

Preferably, the cross section of the annular region is a middle convex arch.

Preferably, the cross-section of the annular region is double arcuate.

Preferably, the spacer and the upper surface of the housing have a predetermined angle therebetween.

Preferably, the isolation device is perpendicular to the upper surface of the housing.

Preferably, the isolation device and the housing are fixedly connected.

Preferably, the material of the elastic zone is rubber, silicone, thermoplastic elastomer or soft polyvinyl chloride.

Preferably, the sound-absorbing material is sound-absorbing particles.

Preferably, the housing comprises a fill port; the cover plate is matched with the filling port; the filling port is used for filling sound absorption materials into the second cavity.

In a second aspect, the present invention provides a method for manufacturing a speaker module, the method comprising:

providing an intermediate structure of a speaker module, the intermediate structure of the speaker module comprising:

an electro-acoustic conversion device;

a housing;

the isolation device is used for dividing the shell into a first cavity for containing the electroacoustic conversion device and a second cavity for containing a sound-absorbing material;

wherein the isolation device has elasticity;

wherein the housing includes a fill port in communication with the second cavity;

filling a preset volume of sound-absorbing material into the filling port to enable the sound-absorbing material in the second cavity to be compact;

the second cavity is closed.

Preferably, the predetermined volume is greater than the volume of the second cavity.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is a schematic cross-sectional view of a speaker module perpendicular to an isolation device according to a first embodiment of the present invention;

fig. 2 and 3 are schematic cross-sectional views of a speaker module according to a first embodiment of the present invention along an isolation device;

fig. 4 is a schematic cross-sectional view of a speaker module according to a first embodiment of the present invention;

fig. 5-8 are schematic cross-sectional views of a speaker module according to a second embodiment of the invention.

Description of reference numerals:

10 casing

11 Upper shell

12 lower shell

13 first chamber

14 second cavity

15 filling port

16 cover plate

20 isolating device

21 elastic zone

22 sound output zone

30 electroacoustic conversion device

40 Sound-absorbing Material

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

With the rapid development of electronic devices such as mobile phones and computers, the audio performance requirements of people are also enhanced, and the requirements on low-frequency sensitivity are gradually improved in addition to pursuing higher medium-frequency response. In order to improve the low-frequency performance of the Speaker module, in addition to improving the performance of the Speaker module (Speaker Box, SB), a method of increasing the low-frequency performance by adding sound-absorbing material in the Speaker module is widely used in the industry, such as sound-absorbing cotton and sound-absorbing particles (Nbass, dbas, etc.).

Increase in the speaker module and inhale the sound cotton and inhale the resonance frequency that the sound granule homoenergetic played the reduction product, promote the low frequency performance of product. But the traditional sound-absorbing cotton has smaller effect. At present, each assembly plant is generally realized by two process modes of making sound absorption particles into small packages or directly filling the sound absorption particles. And will inhale the mode that the sound granule made little parcel, both increased product cost, can't apply to all module designs again, and can't realize performance optimization. The mode of directly filling sound-absorbing particles can be general, the maximization of the filling amount in the cavity can be realized, the performance is optimized, the low-frequency performance of a product can be improved under the condition of limiting the size of the module, the thickness of the module can be reduced on the premise of the same performance, and the requirements of light weight, thinness and high performance of electronic equipment such as mobile phones are met.

However, the traditional direct filling process has two types, one type is to separate the sound-absorbing particles from the electroacoustic conversion device by using Mesh cloth (Mesh), but the assembly process cannot realize the close arrangement of the sound-absorbing particles, when the electroacoustic conversion device vibrates, the sound-absorbing particles collide with each other, noise can be generated, the sound-absorbing particles are damaged and lose efficacy due to long-term collision, the product performance is reduced, and the failure risk of the loudspeaker module is increased. The second direct filling process adopts the mixing of sound-absorbing particles and expansion particles, and utilizes the characteristic that the expansion particles expand when heated to realize the close arrangement of the sound-absorbing particles, thereby eliminating subsequent problems of noise, loss and the like. But the inflation granule is difficult to control with inhaling the sound granule mixing ratio when filling to the proportion needs to change along with different speaker module designs, and the design is complicated, fills up when the granule, encapsulates the back, and the heating temperature and the time of inflation granule can't accurate control, and then the inflation degree is difficult to control, and final performance of product and uniformity can't be guaranteed. Therefore, the process is complex, difficult to control, high in cost and poor in consistency.

In view of this, the first embodiment of the present invention provides a speaker module to improve the performance of the speaker module.

The speaker module of the embodiment of the invention comprises: a housing 10, an electroacoustic conversion device 30, a sound absorbing material 40, and an isolation device 20.

The housing 10 includes an upper shell 11 and a lower shell 12, and the upper shell 11 and the lower shell 12 are fixedly connected to form a closed space.

The housing 10 comprises a filling port 15 and a cover plate 16 matched with the filling port 15; the filling port 15 is used for filling the sound-absorbing material 40 into the second cavity 14.

The sound-absorbing material 40 is sound-absorbing particles. In an embodiment of the invention or other alternative embodiments, the sound absorbing particles may be zeolite particles. The sound absorption material 40 is filled in the second cavity 14, so that the resonance frequency of the speaker module can be reduced, and the low-frequency performance of the speaker module can be improved.

In this or other alternative embodiments of the invention, the isolation device 20 is fixedly connected to the housing 10. The partition means 20 is used to divide the casing 10 into a first cavity 13 for accommodating the electroacoustic conversion device and a second cavity 14 for accommodating the sound-absorbing material 40. Wherein the isolation device 20 has elasticity. The insulator 20 can prevent the sound-absorbing material 40 from entering the first cavity 13.

In this or other alternative embodiments of the invention, the isolation device 20 includes a resilient zone 21 formed of a resilient material. The elastic region 21 of the isolation device 20 protrudes to one side of the first cavity 13. The material of the elastic zone 21 is rubber, silicone, Thermoplastic Elastomer (TPE) or flexible Polyvinyl chloride (PVC).

By adopting the elastic material to form the isolation device 20, when the sound-absorbing material 40 is filled in the second cavity 14 in the subsequent process, the sound-absorbing material 40 with the volume larger than that of the second cavity 14 can be filled, so that the sound-absorbing material 40 is arranged compactly, noise cannot be generated due to mutual friction of vibration and other reasons, and the sound effect of the loudspeaker module cannot be influenced.

In an embodiment or other alternative embodiments of the present invention, as shown in fig. 2 and 3, the isolation device 20 further comprises a sound emitting area 22 made of a breathable material; wherein the elastic zone 21 is an annular zone surrounding the sound emitting zone 22. The breathable material may be a breathable mesh. The air-permeable mesh cloth is adopted, so that the sound generated by the electroacoustic conversion device 30 can be transmitted from the first cavity to the second cavity.

In this or other alternative embodiments of the invention, the cross-section of the annular region is a convexly domed arch, as shown in figure 2.

In an embodiment of the invention or in an alternative embodiment, as shown in fig. 3, the annular region is double arcuate in cross-section.

In other alternative embodiments, the elastic zone 21 is an arc surface disposed in the middle region of the isolation device 20 and protruding toward the first cavity 13, and the sound outlet zone 22 is an annular zone surrounding the elastic zone 21.

Set up elastic zone into cambered surface or arch, can increase elastic zone's elastic material's area to can increase the deformation volume, when being greater than the acoustic material of second cavity to the volume of filling in the second cavity, can avoid leading to isolating device to be destroyed because the deformation volume is little.

In other alternative embodiments, the spring zone 21 may also be planar in shape.

In this or other alternative embodiments of the present invention, the spacer 20 is at a predetermined angle to the upper surface of the housing 10.

In this or other alternative embodiments of the present invention, the isolation device 20 is perpendicular to the upper surface of the housing 10, as shown in fig. 1.

In this or other alternative embodiment of the invention, the isolation device 20 is placed in an inclined position in the housing 10, as shown in fig. 4.

The electroacoustic conversion device 30 includes a frame fixedly connected to the housing 10 and a magnetic member. Wherein, be connected with the vibrating diaphragm on the basin frame, the voice coil loudspeaker voice coil is located the inside of basin frame and magnetic component, and its one end is connected in the internal surface of vibrating diaphragm, and the other end of voice coil loudspeaker voice coil forms the free end and inserts in the magnetic component.

The operation principle of the electroacoustic conversion device 30 is specifically as follows: the voice coil is a coil through which a current is passed, and vibrates in a magnetic field formed by the magnetic assembly upon receiving a current signal. When the current-carrying conductor passes through the magnetic field, it will be subjected to an electrodynamic force whose direction conforms to the fleming's left-hand rule, the force is perpendicular to the direction of the current and the magnetic field, and the force is in direct proportion to the current, the length of the wire and the magnetic flux density. When the voice coil inputs alternating audio current, the voice coil becomes a current-carrying conductor and is subjected to an alternating driving force to generate alternating motion, so that the vibrating diaphragm is driven to vibrate, and air is repeatedly driven to produce sound.

In the embodiment of the present invention, the elastic isolation device 20 is disposed in the housing 10, so that the elastic material in the second cavity 14 is tightly arranged, and when the speaker vibrates, the sound-absorbing particles will not vibrate and rub with the air flow, thereby improving the performance of the speaker module.

The second embodiment of the present invention further provides a method for manufacturing a speaker module, where the method includes:

and step S100, providing an intermediate structure of the loudspeaker module.

Step S200 is to fill a predetermined volume of sound absorbing material 40 into the filling port 15. So as to compact the sound-absorbing material 40 in said second cavity 14.

And step S300, sealing the second cavity 14.

As shown in fig. 5, in step S100, an intermediate structure of the speaker module is provided.

The intermediate structure of the speaker module includes: an electroacoustic conversion device 30, a housing 10, and an isolation device 20.

The partition means 20 is used to divide the housing 10 into a first cavity 13 for accommodating the electroacoustic conversion device 30 and a second cavity 14 for accommodating a sound-absorbing material. The isolation device 20 is resilient.

The housing 10 comprises a filling port 15 communicating with the second cavity 14.

Specifically, the housing 10 includes an upper case 11 and a lower case 12. The intermediate structure of the speaker module may be that the isolation device 20 is fixed on the lower shell 12, the electroacoustic conversion device 30 is fixed on the lower shell 12 of the first cavity 13, and finally the upper shell 11 and the lower shell 12 are fixedly connected.

The filling port 15 is provided on the upper case 11. The housing 10 further comprises a cover plate 16 cooperating with the filling opening 15.

For the specific structure of the speaker module of this embodiment, reference may be made to the first embodiment of the present invention, and details are not described herein.

As shown in fig. 6 and 7, in step S200, a predetermined volume of sound absorbing material 40 is filled into the filling port 15 so that the sound absorbing material 40 in the second cavity 14 is compacted.

Fig. 6 is a schematic view of the sound absorbing material 40 filled in a volume not greater than the second cavity 14. Fig. 7 is a schematic view of the sound absorbing material 40 filled in a larger volume than the second cavity 14. As shown in fig. 6 and 7, the insulator 20 is deformed as the volume of the sound-absorbing material 40 increases.

The predetermined volume is greater than the volume of the second cavity 14. In an alternative implementation, the predetermined volume is 105% -120% of the volume of the second cavity 14.

In the embodiment of the present invention, since the isolation device 20 has elasticity, when the sound-absorbing material 40 is filled in a larger volume than the second cavity 14, the isolation device 20 is deformed by a force. To restore the initial state, the insulator 20 applies a corresponding force to the sound-absorbing material 40, thereby compacting the sound-absorbing material 40 in the second cavity 14.

Meanwhile, the method of the embodiment of the present invention can improve the efficiency of filling the sound-absorbing material 40.

As shown in fig. 8, in step S300, the second cavity 14 is closed.

The filling opening 15 is closed by a cover plate 16, and the cover plate 16 and the filling opening 15 are fixedly connected. Specifically, the cover plate 16 and the filling opening 15 can be fixedly connected by using a sealant, a laser welding process and the like.

In an alternative implementation, the sound absorbing material 40 is sound absorbing particles. The sound absorption particles are directly filled into the second cavity 14, the isolating device 20 prevents the sound absorption particles from entering the first cavity 13, the electroacoustic conversion device 30 is protected, when the sound absorption particles are filled, the telescopic characteristic of the isolating device 20 is utilized, after the sound absorption particles are filled in the second cavity 14, the diaphragm of the separation fence can deform until the deformation amount is maximum, the sound absorption particles in the second cavity 14 reach the maximum amount, the filling port 15 is sealed, the isolating device 20 rebounds, the sound absorption particles in the second cavity 14 are tightly arranged, and when the loudspeaker vibrates, the sound absorption particles cannot vibrate and rub along with air flow, so that the problems of noise, abrasion, failure and the like caused by a common direct filling process are solved.

The embodiment of the invention provides a method for manufacturing a speaker module, in which an elastic isolation device 20 is arranged in a housing 10, and when the volume of a filled sound-absorbing material 40 is larger than that of a second cavity 14, the isolation device 20 deforms due to a force. To restore the initial state, the insulator 20 applies a corresponding force to the sound-absorbing material 40, thereby compacting the sound-absorbing material 40 in the second cavity 14. When the loudspeaker vibrates, the sound-absorbing particles cannot vibrate and rub along with the air flow, and the performance of the loudspeaker module can be improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A speaker module, characterized in that the speaker module comprises:

an electro-acoustic conversion device;

a sound absorbing material;

a housing;

wherein the isolation device has elasticity.

2. A loudspeaker module according to claim 1, wherein the isolation device comprises a resilient zone formed from a resilient material.

3. The speaker module as claimed in claim 2, wherein the resilient region of the isolation device protrudes toward one side of the first cavity.

4. The speaker module as claimed in claim 1, wherein the isolation device further comprises a sound exit region made of a breathable material;

5. A loudspeaker module as claimed in claim 4, wherein the cross-section of the annular region is in the form of a convex dome.

6. A loudspeaker module as claimed in claim 4, wherein the cross-section of the annular region is double arcuate.

7. The speaker module as claimed in claim 1, wherein the spacer is at a predetermined angle to the upper surface of the housing;

8. The speaker module as recited in claim 1, wherein the isolation device is fixedly attached to the housing;

preferably, the material of the elastic zone is rubber, silica gel, thermoplastic elastomer or soft polyvinyl chloride;

preferably, the sound-absorbing material is sound-absorbing particles;

9. A preparation method of a loudspeaker module is characterized by comprising the following steps:

an electro-acoustic conversion device;

a housing;

wherein the isolation device has elasticity;

the second cavity is closed.

10. The method of manufacturing a speaker module according to claim 9, wherein the predetermined volume is larger than the volume of the second cavity.