WO2021135631A1

WO2021135631A1 - Sound-generating device module and electronic product

Info

Publication number: WO2021135631A1
Application number: PCT/CN2020/126644
Authority: WO
Inventors: 华立国; 董文强
Original assignee: 歌尔股份有限公司
Priority date: 2019-12-30
Filing date: 2020-11-05
Publication date: 2021-07-08
Also published as: CN211702289U

Abstract

Disclosed are a sound-generating device module and an electronic product. The sound-generating device module comprises: a module housing, which is provided with an inner cavity; an elastic sound-transmitting screen cloth, which is disposed in the inner cavity and divides the inner cavity into a receiving area and a filling area, the volume of the filling area being a first volume in a state in which the elastic sound-transmitting screen cloth is not elastically deformed; a sound-generating device assembly, which is disposed in the receiving area and is configured to be capable of generating sound; and a sound-absorbing material, which is filled in the filling area, the filling amount of the sound-absorbing material being greater than or equal to 90% of the first volume. The elastic sound-transmitting screen cloth is made of a heat-shrink material, and the elastic sound-transmitting screen cloth is configured to be capable of shrinking and recovering by means of heat treatment or under the action of a preset environment.

Description

Sound device module and electronic product

Technical field

The present invention belongs to the technical field of electro-acoustic conversion. Specifically, the present invention relates to a sound-generating device module and an electronic product.

Background technique

In recent years, consumer electronic products have developed rapidly, and electronic devices such as mobile phones and tablet computers have been widely used by consumers. Among them, the speaker is an important acoustic component in electronic products, which is used to convert electrical signals into sound for consumers to listen to. With the rapid development of related technologies of electronic products, consumers have put forward higher performance requirements for the acoustic performance of electronic products. In this case, those skilled in the art need to make corresponding improvements to the acoustic device.

Existing speaker modules are often provided with sound-absorbing materials to expand the virtual back sound cavity of the speaker module, thereby improving the sound effect of the speaker module. There are many types of sound-absorbing materials that can be used in the prior art, and some of the sound-absorbing materials are in granular form, which are arranged in the speaker module by means such as filling. Due to the influence of factors such as the filling process and the structure of the speaker module, the filling volume of the granular sound-absorbing material is often smaller than the volume of the cavity for containing the sound-absorbing material in the speaker module. This causes the sound-absorbing material to move and shake in the speaker module.

When the speaker module actually works, the air inside and around it will be affected by the diaphragm and vibrate, which will transmit sound. The sound-absorbing materials will also vibrate in the speaker module and rub against each other after being vibrated by the air. This phenomenon may generate vibration noise, which affects the sound effect of the speaker module. On the other hand, vibration may cause the sound-absorbing material to pulverize and break, thereby causing blockage and collapse of the pores of the sound-absorbing material; making the sound-absorbing material ineffective.

Summary of the invention

An object of the present invention is to provide an improved sound generating device module.

According to the first aspect of the present invention, a sound device module is provided, including:

A module housing, the module housing having an inner cavity;

The elastic sound-transmitting mesh cloth is arranged in the inner cavity and divides the inner cavity into a receiving area and a filling area, and when the elastic sound-transmitting mesh cloth is not elastically deformed, The volume of the filling area is the first volume;

A sound emitting device component, the sound emitting device component is disposed in the containing area, and the sound emitting device component is configured to generate sound;

Sound-absorbing material, the sound-absorbing material is filled in the filling area, and the filling amount of the sound-absorbing material is greater than or equal to 90% of the first volume;

The elastic sound-transmitting mesh cloth is made of a heat-shrinkable material, and the elastic sound-transmitting mesh cloth is configured to be capable of shrinking and recovering deformation through heat treatment or under the action of a preset environment.

Optionally, the elastic sound-transmitting mesh fabric is made of at least one of PVC, PET, ABS, EVA and other materials.

Optionally, a filling hole is formed on the module housing, the filling hole is in communication with the filling area, and the filling hole is opposite to the position of the elastic sound-transmitting mesh.

Optionally, the elastic sound-permeable mesh fabric has a shrinkage deformation rate of 25%-50% relative to the area of the elastic sound-permeable mesh fabric after being elastically deformed during shrinkage recovery deformation.

Optionally, the elastic sound-transmitting mesh cloth is configured to be restored to a flat state after being contracted and deformed.

Optionally, the filling amount of the sound absorbing material is greater than or equal to the first volume.

Optionally, the temperature of the heat treatment is greater than or equal to 70°C.

Optionally, the temperature range of the heat treatment is 100°C-120°C.

A technical effect of the present invention is to reduce the rubbing problem of sound-absorbing materials.

According to another aspect of the present invention, there is also provided an electronic product, including: a product main body, and the above-mentioned sounding device module, the sounding device module being disposed in the product main body.

Through the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear.

Description of the drawings

The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present invention, and together with the description thereof, serve to explain the principle of the present invention.

Fig. 1 is a schematic side sectional view of a sound device module provided by the present invention.

Detailed ways

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

The following description of at least one exemplary embodiment is actually only illustrative, and in no way serves as any limitation to the present invention and its application or use.

The technologies, methods, and equipment known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be regarded as part of the specification.

In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiment may have different values.

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

The invention provides a sound device module. The sound device module includes a module housing, a sound device component, an elastic sound-transmitting mesh and a sound-absorbing material. The sound generating device assembly is arranged in the module housing, and the sound generating device assembly can vibrate to generate sound after receiving a sound signal, and the sound generated by the sound generating device assembly can be transmitted from the module housing. The sound device module can usually be used as a speaker or earpiece in electronic products such as mobile phones and tablet computers.

As shown in FIG. 1, the elastic sound-transmitting mesh cloth 3 is arranged in the inner cavity of the module housing 1, thereby dividing the inner cavity into a receiving area 11 and a filling area 12. The accommodating area 11 is used for accommodating the sound device assembly 2, and the filling area 12 is used for accommodating the sound-absorbing material 4. The elastic sound-transmitting mesh cloth 3 is made of a metal wire mesh, a non-woven fabric, and the like that can pass sound. It can intercept the sound absorbing material 4 and prevent the sound absorbing material 4 from moving from the filling area 12 to the containing area 11. At the same time, the elastic sound-transmitting mesh cloth 3 can transmit the sound generated by the sound device assembly 2 from the receiving area 11 to the filling area 12 through the elastic sound-transmitting mesh cloth 3.

The elastic sound-transmitting mesh cloth 3 has a certain elastic deformation ability. When the elastic sound-transmitting mesh cloth 3 is not elastically deformed, the volume of the filling area 12 formed by the elastic sound-transmitting mesh cloth 3 and the module housing 1 is the first volume.

The sound absorbing material 4 is filled in the filling area 12, as shown in FIG. 1. The filling amount of the sound absorbing material 4 is greater than or equal to 90% of the first volume. That is, the total volume of the sound absorbing material 4 filled in the filling area 12 is greater than or equal to 90% of the first volume. In this assembly, the device for filling the sound-absorbing material 4 or other external devices can apply a filling force to the sound-absorbing material 4, so that the elastic sound-transmitting mesh cloth 3 is elastically deformed, thereby increasing the filling area 12 volume. Through this embodiment, the elastic sound-transmitting mesh cloth 3 is elastically deformed, and the volume of the filling area 12 is increased, so that a larger amount of sound-absorbing material 4 can be accommodated, and even a sound-absorbing material 4 with a volume larger than the first volume can be accommodated. In the technical solution of the present invention, the elastic deformation generated by the elastic sound-transmitting mesh cloth can make the elastic deformation that can be restored naturally in the traditional sense, or it can be the extension deformation that cannot be restored naturally. The present invention does not deal with the elastic sound-transmitting mesh cloth. The deformation form when receiving the filling force is limited.

The elastic sound-transmitting mesh cloth is configured to be capable of shrinking and recovering deformation through heat treatment. In the embodiment of the present invention, the elastic sound-transmitting mesh cloth may be made of a material with shape memory properties, or a material with the characteristics of heat shrinkage. In this way, after the elastic sound-transmitting mesh is elastically deformed, heat treatment can be applied to the elastic sound-transmitting mesh, so that it can be restored to a certain extent to a state close to the state before deformation, or completely restored to no elasticity. The deformed state.

It should be noted that, in this embodiment, the elastic sound-transmitting mesh is heat-treated to restore it to a substantially undeformed state as an example, but in practical applications, the elastic sound-transmitting mesh is not limited to the recovery of deformation. For the technical means of heat treatment, it can also be another specific preset environment, as long as it can be restored to a state close to the undeformed state under the force of the preset environment.

By adopting the technical solution of the present invention, the filling amount of the sound-absorbing material in the filling area can be increased. In the present invention, after the shape of the elastic sound-transmitting mesh is restored, the elastic sound-transmitting mesh can generate a pushing force on the sound-absorbing material, and push the sound-absorbing material to an area in the filling area that is not easily occupied by the sound-absorbing material , Such as the position of the corners of the filled area or the irregularly shaped area or narrow area in the filled area. Further, due to the relatively large filling amount of the sound-absorbing material, after the elastic sound-transmitting mesh cloth is restored to its shape, the sound-absorbing material can also fill the area of the can filling opening that is difficult to fill in the prior art.

In the technical solution of the present invention, the sound-absorbing material can better fill the filling area. In the actual work of the sound device module, the sound-absorbing material is not easy to vibrate or rub due to factors such as sound vibration, which reduces the possibility of noise and affects the acoustic performance. This improvement effect comes from the fact that the filling amount of the sound absorbing material is higher, the filling area can be basically filled or completely filled, and the sound absorbing material in the filling area is close to each other under the restriction of space, and even a certain compression effect can be produced. In this way, the sound-absorbing material is not easy to vibrate and rub when it receives sound or air vibration.

In the prior art, due to the limitation of the canning process of sound-absorbing materials, and the relatively complex and narrow area in the shape and space of the module housing of the sound-emitting device module, it is difficult for the sound-absorbing material to move to the sound-absorbing material during the normal filling process. This part of the area. Furthermore, the sound-absorbing material cannot fill the filled area, resulting in hidden dangers of rubbing and shaking. This causes the sound-absorbing material inside to be in a loose state after the sound-generating device module is assembled. Vibration or shaking will cause the sound-absorbing materials to collide and rub against each other in the sound-generating device module, and generate noise. The technical solution of the present invention effectively solves this problem and reduces or avoids the problems of sound-absorbing materials colliding and rubbing against each other.

The sound-absorbing material may be porous sound-absorbing material particles, sound-absorbing material powder, etc. The sound-absorbing materials are mostly arranged in bulk in the module housing.

Optionally, the elastic sound-transmitting mesh cloth can be made of PVC (polyvinyl chloride), PET (polyethylene terephthalate), ABS (terpolymer resin), EVA (ethylene-vinyl acetate copolymer). ) Is made of at least one of them. The above-mentioned materials usually have a linear microstructure. After they are made into a mesh structure such as an elastic sound-transmitting mesh, it can have a certain shape memory effect. For example, after elastic deformation, it can be re-shrinked and restored to its original shape by heat treatment. The above-mentioned polymer heat shrinkable material used in the present invention uses the principle that the internal shrinkage stress of the material causes the chain segments to shrink when heated. This kind of shrinkage is a unidirectional deformation. Once the above-mentioned materials undergo elastic deformation and heat shrinkage, they will no longer undergo typical thermal expansion and contraction changes with temperature. In this way, the sound-generating device module provided by the present invention can play a stable and reliable restrictive effect on the sound-absorbing material, and prevent problems such as vibration and rubbing.

In addition, the use of the above-mentioned polymer material as the heat-shrinkable material has the characteristics of low shrinkage temperature and fast shrinkage, and can realize the shrinkage recovery deformation process more efficiently. The above-mentioned polymer materials also have good flame-retardant and insulating properties, and can improve the reliability of the sound device module.

Optionally, the elastic sound-transmitting mesh cloth can also be made of other materials with thermal shrinkage and deformation characteristics. For example, metal wire mesh can be used as a material for sound-transmitting mesh cloth, which has good performance in intercepting sound-absorbing materials and allowing sound to pass through. The metal wire mesh can be made of a memory metal with heat-sensitive deformation performance, so as to meet the above-mentioned technical requirements for heat shrinkage and deformation.

Optionally, a filling hole may be formed on the module housing. The filling hole communicates with the filling area, and the filling hole is used to communicate the filling area with the outside. When filling and filling the sound-absorbing material, the sound-absorbing material can be filled into the filling area through the above-mentioned filling hole. By arranging a filling hole on the module housing, the step of filling the sound-absorbing material can not affect the containing area and improve the assembly reliability. Optionally, the filling hole may be opposite to the position of the elastic sound-transmitting mesh. In this way, the sound-absorbing material filled into the filling area can be directly moved to the position where the elastic sound-transmitting mesh cloth is located. This design method makes it easier to elastically deform the elastic sound-transmitting mesh cloth, thereby increasing the filling saturation of the sound-absorbing material in the filling area, and reducing the possibility of the sound-absorbing material being loose and easy to rub.

Optionally, the elastic sound-transmitting mesh fabric is configured to produce 25%-50% shrinkage deformation relative to its area after elastic deformation when undergoing heat treatment to produce shrinkage recovery deformation. That is, the shrinkage rate of the elastic sound-transmitting mesh fabric with respect to the area after elastic deformation is 25%-50%. In this way, the elastic sound-transmitting mesh cloth can produce relatively large shrinkage and deformation in a natural state, so as to achieve the technical effect of pushing the sound-absorbing material to various areas of the filling area and generating a squeezing force on the sound-absorbing material.

Optionally, the elastic sound-transmitting mesh cloth is configured to be able to recover to a flat state before elastic deformation after shrinking and restoring deformation. The advantage of this embodiment is that, on the one hand, the sound-absorbing material can effectively fill the filling area; on the other hand, the elastic sound-transmitting mesh will not bend toward the receiving area and occupy the space of the receiving area, ensuring that The sound device components on the side of the containing area will not be affected.

For the filling amount of the sound-absorbing material filled in the filling area. In the technical solution of the present invention, since the elastic sound-transmitting mesh can be elastically deformed, compared to the prior art, more sound-absorbing materials can be filled into the filling area.

For example, 80% of the space in the filling area is the area where the sound-absorbing material is easy to move when it is filled with the sound-absorbing material, and 20% of the space is the area where the sound-absorbing material is difficult to move to. In the prior art, through the traditional filling method, the filling amount of the sound absorbing material can only reach an amount occupying 85% of the volume of the filling area at most. In the technical solution of the present invention, the filling amount of the sound-absorbing material can reach more than 90% of the first volume. After the elastic sound-transmitting mesh is heated to produce shrinkage and recovery deformation, the force of the elastic sound-transmitting mesh can push the sound-absorbing material more to areas that are difficult to reach in the filling area. Optionally, the filling amount of the sound absorbing material may be equal to 95% of the first volume.

Optionally, the filling amount of the sound-absorbing material in the filling area is greater than or equal to the first volume. For example, the filling amount of the sound-absorbing material is equivalent to 100%, 101%-103% of the first volume. In this way, after the elastic sound-permeable mesh fabric shrinks and recovers deformation, the sound-absorbing material can more effectively fill the filling area. Further, the elastic sound-permeable mesh cloth can also generate a squeezing force on the sound-absorbing material, improve the compactness of the sound-absorbing material, and reduce the possibility of vibration.

The present invention also provides a method for assembling the sounding device module, which can be used to make the above-mentioned sounding device module.

The assembly method is as follows:

An elastic sound-permeable mesh cloth is assembled in the inner cavity of the module housing, so that the elastic sound-permeable mesh cloth separates the inner cavity into a containing area and a filling area. The sound device components are fixedly installed in the containing area.

The sound-absorbing material is filled in the filling area, and the filling amount of the sound-absorbing material is greater than or equal to 90% of the first volume of the filling area. By filling the sound-absorbing material, the elastic sound-transmitting mesh is elastically deformed, and the volume of the filling area is increased.

Heat treatment is applied to the elastically deformed elastic sound-transmitting mesh to cause the elastic sound-transmitting mesh to shrink and recover from deformation. The elastic sound-transmitting mesh cloth returns to the state close to before the elastic deformation, or returns to the state before the elastic deformation. The elastic sound-transmitting mesh cloth pushes the sound-absorbing material to the area that is not easy to move in the filling area during the recovery process, and can exert a squeezing force on the sound-absorbing material. After the elastic sound-transmitting mesh cloth completes its contraction, recovery and deformation, it can form a limiting effect on the sound-absorbing material and avoid the problems of vibration and rubbing of the sound-absorbing material.

Optionally, the temperature of the heat treatment is greater than or equal to 70°C. In this temperature range, the heat-shrinkable material can be deformed by shrinkage and recovery.

Optionally, the temperature range of the heat treatment is 100°C-120°C. Avoiding excessive heat treatment temperature can protect the sound-absorbing materials and components in the sound device module, and prevent these components from being damaged during the heat treatment. At the same time, this temperature range can ensure that the heat-shrinkable material quickly realizes shrinkage recovery deformation, and achieves the purpose of limiting the sound-absorbing material of the present invention.

Optionally, before performing the heat treatment, the filling area may be closed first to prevent the sound absorbing material already filled in the filling area from leaking from the filling hole or other open parts of the filling area. After the heat treatment, the elastic sound-transmitting mesh can squeeze the sound-absorbing material to improve the compactness of the sound-absorbing material.

The invention also discloses an electronic product, and the sound device module is arranged in the electronic product. This electronic product has better sound quality.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims

A sound device module, characterized in that it comprises:

A module housing, the module housing having an inner cavity;

The elastic sound-transmitting mesh cloth is arranged in the inner cavity and divides the inner cavity into a receiving area and a filling area, and in a state where the elastic sound-transmitting mesh cloth does not elastically deform, The volume of the filling area is the first volume;

A sound emitting device component, the sound emitting device component is disposed in the containing area, and the sound emitting device component is configured to generate sound;

Sound-absorbing material, the sound-absorbing material is filled in the filling area, and the filling amount of the sound-absorbing material is greater than or equal to 90% of the first volume;

The elastic sound-transmitting mesh cloth is made of a heat-shrinkable material, and the elastic sound-transmitting mesh cloth is configured to be capable of shrinking and recovering deformation through heat treatment or under the action of a preset environment.
The sound device module according to claim 1, wherein the elastic sound-transmitting mesh fabric is made of at least one of PVC, PET, ABS, EVA and other materials.
The sound device module according to claim 1, wherein a filling hole is formed on the housing of the module, the filling hole communicates with the filling area, and the filling hole is connected to the elastic The position of the sound-transmitting mesh is relative.
The sound device module according to claim 1, wherein the elastic sound-transmitting mesh has a shrinkage deformation rate of 25%-50% relative to the area of the elastic sound-transmitting mesh when the elastic sound-transmitting mesh is retracted and deformed. %.
The sound device module according to claim 1, wherein the elastic sound-transmitting mesh is configured to be restored to a flat state after being contracted and deformed.
The sound device module according to claim 1, wherein the filling amount of the sound absorbing material is greater than or equal to the first volume.
The sound device module according to claim 1, wherein the temperature of the heat treatment is greater than or equal to 70°C.
The sound device module according to claim 7, wherein the temperature range of the heat treatment is 100°C-120°C.
An electronic product, characterized in that it includes:

Product subject;

The sound emitting device module according to any one of claims 1-8, the sound emitting device module being arranged in the product main body.