CN115460518B

CN115460518B - Shell of sound generating device, sound generating device and electronic equipment

Info

Publication number: CN115460518B
Application number: CN202211112706.8A
Authority: CN
Inventors: 周厚强; 王婷; 李春
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2022-09-14
Filing date: 2022-09-14
Publication date: 2024-05-14
Anticipated expiration: 2042-09-14
Also published as: CN115460518A

Abstract

The invention discloses a shell of a sound generating device, the sound generating device and electronic equipment, wherein at least one part of the shell is a microporous foaming shell, the raw material of the microporous foaming shell comprises engineering plastic materials, the microporous foaming shell is an integrated part formed by foaming injection molding, and the microporous foaming shell comprises a first surface layer, a core layer and a second surface layer which are sequentially laminated; wherein, the pore diameter of the pore channel in the first surface layer and the second surface layer or in the first surface layer and the second surface layer is less than 0.5 mu m, the core layer is provided with a microporous foaming structure, the microporous foaming structure is a closed pore foaming structure with cells, the diameter of the cells is 0.5 mu m-30 mu m, and the opening ratio of the cells on the core layer is less than 10%. The shell of the sound generating device can meet the reliability requirement of the sound generating device, and can also realize the waterproof and air permeability resistance performance and the light weight requirement.

Description

Shell of sound generating device, sound generating device and electronic equipment

Technical Field

The present invention relates to the field of electroacoustic technology, and more particularly, to a case of a sound generating device, a sound generating device using the case, and an electronic apparatus using the sound generating device.

Background

Along with the development of electroacoustic technology field, electroacoustic devices gradually develop towards the directions of light weight, thinness, intellectualization, high power and high frequency.

The traditional loudspeaker shell is usually prepared by adding glass fiber reinforced materials into PC (polycarbonate) materials and performing common injection molding, however, the reinforcing effect of the glass fiber materials on the PC materials is poor, for example, when the bending modulus of the loudspeaker shell needs to reach 5GPa, more than 20wt% of glass fibers are generally required to be added, and the addition amount is large. Further, the density of the glass fiber was approximately 2.5g/cm ³～2.8g/cm³, the density of the PC material was approximately 1.2g/cm ³, and it was found that the density of the glass fiber was much higher than that of the PC resin. Along with the increase of the addition amount of the glass fiber, the density of the loudspeaker shell is also increased, so that the weight of the loudspeaker shell is larger, the whole weight of the electronic equipment is overlarge, and the use experience of consumers is affected.

In addition, after the glass fiber is added into the PC material, the toughness of the PC material is reduced, so that the prepared loudspeaker shell is easy to break and lose efficacy in a drop reliability test.

Therefore, a new technical solution is needed to meet the requirements of light weight, high toughness, impact strength, reliability, etc.

Disclosure of Invention

An object of the present invention is to provide a housing of a sound generating apparatus, which can solve at least one of the technical problems of heavy weight, poor reliability, etc. of a housing made of a PC material in the conventional art.

It is still another object of the present invention to provide a sound emitting device comprising the above-mentioned housing and sound emitting unit.

It is still another object of the present invention to provide an electronic device including the above sound emitting apparatus.

In order to achieve the above object, the present invention provides the following technical solutions.

According to the shell of the sound generating device, at least one part of the shell is a microporous foam shell, raw materials of the microporous foam shell comprise engineering plastic materials, the microporous foam shell is an integrated part formed by foaming and injection molding of the raw materials, and the microporous foam shell comprises a first surface layer, a core layer and a second surface layer which are sequentially laminated;

wherein the pore diameter of the pore channels in the first surface layer and the second surface layer is less than 0.5 μm,

The core layer is provided with a microporous foaming structure, the microporous foaming structure is a closed-pore foaming structure with cells, the diameter of each cell is 0.5-30 mu m, and the opening ratio of each cell on the core layer is less than 10%.

According to some embodiments of the invention, the engineering plastic material comprises at least one of poly 4 methyl-1-pentene, polypropylene, syndiotactic polystyrene, PA66, PA6, PA68, PA610, PA612, PA9, PA1010, PA1012, PA11, PA12, PA1212, PA1313, PPA, PEI polycarbonate, polyoxymethylene, polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polyarylate, polyetheretherketone, liquid crystal polymer.

According to some embodiments of the invention, the feedstock further comprises a reinforcing agent comprising at least one of glass fibers, carbon fibers, basalt fibers, and polymeric fibers.

According to some embodiments of the invention, the content of the reinforcing agent is 10wt% to 40wt% of the total weight of the raw material.

According to some embodiments of the invention, the feedstock further comprises a nanofiller comprising at least one of silica, carbon black, clay, carbon nanotubes, calcium carbonate, cellulose, montmorillonite, aluminum oxide, graphene oxide, talc, mica powder, kaolin, wollastonite, diatomaceous earth, titanium dioxide.

According to some embodiments of the invention, the maximum dimension of the outer profile of the nanofiller is 3 μm or less.

According to some embodiments of the invention, the nanofiller is present in an amount of 0.1wt% to 3wt% based on the total weight of the feedstock.

According to some embodiments of the invention, the microcellular foam shell has a density of 0.8g/cm ³～1.2g/cm³.

According to some embodiments of the invention, the flexural modulus of the microcellular foam shell is greater than or equal to 3GPa.

According to some embodiments of the invention, the heat distortion temperature of the microcellular foam shell is greater than or equal to 130 ℃.

According to some embodiments of the invention, the housing comprises a first sub-housing and a second sub-housing, the first sub-housing is bonded or integrally injection molded with the second sub-housing, the first sub-housing is formed into the microcellular foam housing, and the second sub-housing is prepared from at least one of steel, aluminum alloy, copper alloy, titanium alloy, PP and modified materials thereof, PA and modified materials thereof, PET and modified materials thereof, PBT and modified materials thereof, PPs and modified materials thereof, PEI and modified materials thereof, PEEK and modified materials thereof, PEN and modified materials thereof, PPA and modified materials thereof, PC and modified materials thereof, SPS and modified materials thereof, TPX and modified materials thereof, POM and modified materials thereof, and LCP and modified materials thereof.

A sound emitting device according to an embodiment of the second aspect of the present invention includes a housing of any one of the sound emitting devices described above.

An electronic device according to a third aspect of the present invention includes the sound emitting apparatus according to the above-described embodiment.

According to the shell of the sound generating device, through the integrally formed microporous foam shell with the three-layer structure, the waterproof and ventilation-proof effects are achieved by utilizing the characteristics that the first surface layer and the second surface layer are free of pore channels or small in pore diameter, and the weight of the shell is reduced by utilizing the core layer with the microporous foam structure, so that the shell is light.

Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic diagram of a sound emitting device according to an embodiment of the present invention;

fig. 2 is a partial schematic view of a cross-section of a microcellular foam housing according to an embodiment of the present invention.

Reference numerals

A sound generating device 100;

a housing 10; an upper case 11; a first skin layer 111; a core layer 112; a second skin layer 113; a lower case 12;

Sound producing unit 20.

Detailed Description

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

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

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

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

The housing 10 of the sound generating apparatus 100 according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings. The sound generating device 100 may be a speaker module.

As shown in fig. 1 and 2, according to the case 10 of the sound generating device 100 of the embodiment of the present invention, at least a part of the case 10 is a microcellular foam case, a raw material of the microcellular foam case includes an engineering plastic material, the microcellular foam case is an integrally formed part formed by foaming and injection molding of the raw material, and the microcellular foam case includes a first skin layer 111, a core layer 112 and a second skin layer 113 which are sequentially stacked.

Specifically, the pore diameter of no pore in the first skin layer 111 and the second skin layer 113 or the pore diameter of pore in the first skin layer 111 and the second skin layer 113 is less than 0.5 μm, the core layer 112 has a microcellular foam structure which is a closed-cell foam structure having cells with a diameter of 0.5 μm to 30 μm, and the aperture ratio of the cells on the core layer 112 is less than 10%.

In other words, at least a part of the housing 10 of the sound emitting device 100 of the present invention is constituted by a microcellular foam housing, which can be manufactured from raw materials including engineering plastic materials through a microcellular foam injection molding process, and which is an integral molded piece. The engineering plastic material has excellent comprehensive performance, for example, the engineering plastic material has the advantages of high rigidity, high mechanical strength, good heat resistance, good electrical insulation and the like, and can be used for a long time in harsh chemical and physical environments. When the microporous foam shell is processed and prepared, engineering plastic materials in the form of matrix resin can be adopted, so that the material feeding and the processing are convenient.

Further, the integrally molded microcellular foam housing of the present invention has a three-layer structure of the first skin layer 111, the core layer 112, and the second skin layer 113, respectively. The first skin layer 111, the core layer 112 and the second skin layer 113 are sequentially laminated, that is, the microcellular foam casing includes two skin layers, the first skin layer 111 and the second skin layer 113, respectively, and one core layer 112 disposed between the two skin layers.

It should be noted that, the microcellular foam shell is an integrally formed part formed by micro-foaming and injection molding of the raw materials, that is, the first skin layer 111, the core layer 112 and the second skin layer 113 are integrally formed, and are not required to be connected in other manners, for example, the connection can be realized without adopting gluing or other manners, and only the foaming degrees of different areas are required to be controlled to form the first skin layer 111, the core layer 112 and the second skin layer 113 with different structures, so that the structural reliability and the firmness are improved, the separation between the first skin layer 111, the core layer 112 and the second skin layer 113 is avoided, the complexity of the manufacturing process is reduced, and the first skin layer 111, the core layer 112 and the second skin layer 113 which are connected with each other can be simultaneously formed without additional process steps.

Compared with the prior art, the prior art adhesive multilayer shell has the disadvantage of limited shape, and most shells formed by the prior art adhesive multilayer structure can only be formed into regular shapes, such as rectangular sheets. The microporous foam shell is formed into an integral molding part through micro-foaming injection molding, and can form structures with various shapes, namely regular shape parts and irregular shape parts. That is, the micro-foam molding-shaped micro-porous foam shell can form uneven areas such as corners, so that the structural consistency of each position of the shell 10 of the sound generating device 100 is greatly improved, other shell structures are not required to be additionally adhered to the corners, the turning parts and the like, and the appearance attractiveness and consistency of the shell 10 of the sound generating device 100 are improved.

Optionally, the first skin layer 111 and the second skin layer 113 have no pores, that is, the first skin layer 111 and the second skin layer 113 may have a compact structure without pores, and may prevent the liquid and the gas from passing through, so that the liquid and the gas cannot pass through the microporous foam shell from two outer sides of the microporous foam shell, and the waterproof, dustproof and gas permeation preventing effects are achieved, so as to protect the structure accommodated in the shell 10, for example, protect the sounding monomer 20 in the shell 10.

Alternatively, the first skin layer 111 and the second skin layer 113 may have pores therein, but the pore diameter of the pores is smaller than 0.5 μm, so that it is still difficult for liquid and gas to enter and exit the housing 10 through the pores, and thus the effects of preventing water and gas permeation can be achieved, thereby protecting the structure accommodated in the housing 10.

It can be seen that the first skin layer 111, the second skin layer 113 and the core layer 112 can be integrally formed by foaming, wherein the foaming rate of the first skin layer 111 and the second skin layer 113 is lower than that of the core layer 112. Wherein the closed cell foaming rate of the core layer 112 may be greater than or equal to 90%.

In addition, the core layer 112 has a microcellular foam structure, which is a closed-cell foam structure having cells. In the foamed structure, the gas exists in the form of cells in the foam, whereas in the closed-cell foamed structure, the core layer 112 has an independent cell structure, and the inner cells are separated from the cells by wall films, and are not connected to each other. The closed-cell foam material has the advantages of excellent impact resistance, elasticity, softness, waterproofness and the like.

Wherein the diameter of the cells is 0.5 μm to 30 μm, the aperture ratio of the cells on the core layer 112 is < 10%, that is, when the cells are provided in the first skin layer 111 and/or the second skin layer 113, the diameter of the cells is larger than the diameter of the cells, and the ratio of the area of the open area on any cross section on the core layer 112 to the total area of the cross section is less than 10%. For example, a cross-section of the core layer 112 having an area of 10cm ² may have a total area of open areas of less than 1cm ². It should be noted that if the diameter of the cells is smaller than 0.5 μm, the density of the core layer 112 will be large, so that the weight-reducing effect of the microcellular foam shell will be deteriorated. If the diameter of the foam cells is larger than 30 μm, the foam cells have a better weight reduction effect, but have a larger negative effect on the mechanical properties, mechanical properties and the like of the microporous foam shell, for example, the flexural modulus is reduced, so that the microporous foam shell is easy to deform and lose efficacy in a reliability test. By controlling the pore diameter of the pores to be between 0.5 and 50 mu m, the microporous foaming shell can be ensured to have good mechanical property and mechanical property, plays a role of light weight, and is beneficial to reducing the weight of the shell 10 and the sound generating device 100 comprising the shell 10. Alternatively, the diameters of the cells are 0.5 μm, 1.5 μm, 2.5 μm, 3.0 μm, 10 μm, 20 μm, 30 μm, etc., and the housing 10 can be ensured to have the advantages of light weight, high modulus, temperature resistance, etc.

The pore size may be an average pore size of cells, that is, pore sizes of respective cells in the core layer 112 may be different. For example, in some embodiments, the pore size of the cells may be 0.5 μm to 5 μm, in which case the smallest pore size of the cells in the core layer 112 may be 0.5 μm and the largest pore size of the cells in the core layer 112 may be 5 μm.

Thus, according to the housing 10 of the sound generating device 100 of the embodiment of the present invention, by providing the integrally formed microporous foam housing having a three-layer structure, the characteristics of no pore canal or small pore diameter of the first skin layer 111 and the second skin layer 113 are utilized to play a role in preventing water and gas from permeating, and the core layer 112 having a microporous foam structure is utilized to reduce the weight of the housing 10, so that the housing 10 is light. In addition, the engineering plastic has good temperature resistance, and can meet the high-temperature reliability requirement of the shell 10 of the sound generating device 100.

According to one embodiment of the invention, the engineering plastic material comprises at least one of poly 4 methyl-1-pentene (TPX), polypropylene (PP), syndiotactic Polystyrene (SPS), PA66, PA6, PA68, PA610, PA612, PA9, PA1010, PA1012, PA11, PA12, PA1212, PA1313, polyphthalamide (PPA), polyetherimide (PEI), polycarbonate (PC), polyoxymethylene (POM), polyphenylene oxide (PPO), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyphenylene Sulfide (PPs), polyarylate (PAR), polyetheretherketone (PEEK), liquid Crystal Polymer (LCP). The microporous foam shell prepared from the material can meet the high-temperature reliability requirement of the loudspeaker module because the material has good temperature resistance.

According to one embodiment of the present invention, the raw material further includes a reinforcing agent, and the strength of the case 10 can be improved by using the reinforcing agent. The reinforcing agent comprises at least one of glass fiber, carbon fiber, basalt fiber and polymer fiber. Alternatively, the polymer fibers may be selected from polyaramid fibers, polyimide fibers, and the like. By using a fibrous material as the reinforcing agent, not only the strength of the case 10 can be improved, but also the fibrous material can make the case 10 less likely to break even if the case 10 is locally slightly broken.

The density of the glass fiber material is generally 2.5g/cm ³～2.8g/cm³, and the glass fiber can comprise alkali-free glass fiber, medium alkali glass fiber, high-strength glass fiber, alkali-resistant glass fiber, low-dielectric glass fiber and the like, and has the advantage of wide selection variety.

Optionally, the feedstock further comprises a silane coupling agent. It should be noted that, because the surface energy of the glass fiber is too different from that of the engineering plastic material, so that wettability and dispersibility of the glass fiber in the engineering plastic material are poor, the glass fiber may be surface treated to improve compatibility between the two, for example, the surface of the glass fiber may be treated with a silane coupling agent during production and processing. Further, the silane coupling agent used may include a methacryloxy silane coupling agent, a vinyl silane coupling agent, an alkyl silane coupling agent, a chloroalkyl silane coupling agent, etc., which can improve the strength of the produced housing 10.

In addition, when carbon fibers are used as the reinforcing fibers, the density of the carbon fibers is generally 1.5g/cm ³～2.0g/cm³, and it can be seen that the density of the carbon fibers is smaller than that of the glass fibers. In addition, the reinforcing effect of the carbon fiber is excellent. It should be noted that, because the compatibility between the carbon fiber and the engineering plastic material is poor, optionally, during the production and processing, a layer of polymer material is pre-impregnated on the carbon fiber to perform surface treatment on the carbon fiber, so that the compatibility between the carbon fiber and the engineering plastic material is improved, and the strength of the prepared shell 10 can be improved.

When the basalt fiber is adopted as the reinforcing fiber, the basalt fiber has the advantage of high modulus, but the surface energy of the basalt fiber is relatively low, and optionally, during production processing, the basalt fiber is subjected to surface treatment, so that the surface activity of the basalt fiber is improved, and the modulus of the prepared shell 10 can be improved.

When the polymer fiber is used as the reinforcing fiber, the density of the polymer fiber is generally less than 1.5g/cm ³, and the common polymer fiber can be aromatic polyamide fiber or polyimide fiber, so that the polymer fiber has better temperature resistance, and the compatibility between the polymer fiber and engineering plastic is better, so that the shell 10 prepared from the polymer fiber has temperature resistance.

According to one embodiment of the invention, the reinforcing agent is present in an amount of 10wt% to 40wt% based on the total weight of the feedstock, that is, the weight percent of reinforcing agent is 10wt% to 40wt%, inclusive of the end points 10wt% and 40wt%. When the mass fraction of the reinforcing agent is less than 10wt%, the reinforcing effect of the reinforcing agent on the engineering plastic material is small, the mechanical property of the engineering plastic material is easy to be low, the temperature resistance is poor, and the prepared microporous foam shell is easy to be damaged and invalid. When the weight percentage of the reinforcing agent is more than 40wt%, the density of the reinforcing agent is usually more than that of the engineering plastic material, and the larger the weight percentage of the reinforcing agent is, the overlarge density of the microporous foam shell is caused, so that the aim of light weight is not fulfilled. And as the weight fraction of the reinforcing agent increases, the melt viscosity of the engineering plastic material increases, the melt index becomes smaller, and it is difficult to mold a thin-wall product, that is, it is difficult to mold a thin-thickness shell 10. When the reinforcing agent accounts for 10-40wt% of the raw materials, the shell 10 has the advantages of good mechanical properties, high temperature resistance and low density, that is, the requirements of the sound generating device 100 for light weight can be met, and the requirements of the sound generating device 100 for mechanical properties and high temperature resistance can be met. Optionally, the weight percentage of the reinforcing agent is 10wt%, 15wt%, 20wt%, 25wt%, 30wt% or 40wt%, etc. can improve the mechanical property and high temperature resistance of the obtained microporous foam shell, realize the purpose of light weight, and further facilitate the obtaining of the microporous foam shell with thinner thickness through injection molding.

According to one embodiment of the invention, the raw material further comprises a nano-filler, wherein the nano-filler comprises at least one of silicon dioxide, carbon black, clay, carbon nano-tube, calcium carbonate, cellulose, montmorillonite, aluminum oxide, graphene oxide, talcum powder, mica powder, kaolin, wollastonite, diatomite and titanium dioxide. It should be noted that, in the process of preparing the microporous foamed shell, the nano filler can induce the gas to form gas core first, the gas core can form bubbles, and finally, the bubbles of the core layer 112 are formed, which is beneficial to realizing the light weight of the shell 10.

Optionally, the raw materials also comprise a coupling agent. The surface of the nano-filler can be treated by a coupling agent, for example, silane coupling agent and titanate coupling agent are adopted for treatment, so that the compatibility of the nano-filler and engineering plastic materials can be improved. Wherein, silicon dioxide, clay, montmorillonite, aluminum oxide, talcum powder, mica powder, kaolin, wollastonite and diatomite can be treated by using a silane coupling agent, and the silane coupling agent comprises: vinyl triethoxysilane, vinyl trimethoxysilane, 3-methacryloxypropyl triethoxysilane, 3-methacryloxypropyl trimethoxysilane, 3-acryloxypropyl trimethoxysilane, 3-aminopropyl triethoxysilane. Wherein, carbon black, carbon nano tube, calcium carbonate, cellulose graphene, graphene oxide and titanium dioxide can be treated by titanate coupling agent.

In this embodiment, the coupling agent is used to treat the nanofiller, and the molecule of the coupling agent has both a reactive group capable of being combined with the inorganic material and a reactive group capable of being combined with the organic material, which is favorable for improving the compatibility of the nanofiller and the engineering plastic material, and improving the binding force between the nanofiller and the engineering plastic material, thereby improving the binding force between the first skin layer, the core layer and the second skin layer, and the firmness of the prepared shell 10.

According to one embodiment of the invention, the maximum dimension of the outer contour of the nanofiller is less than or equal to 3 μm, that is to say the three-dimensional maximum dimension of the nanofiller is not more than 3 μm. It should be noted that if the size of the nanofiller is more than 3 μm, the induction of the formation of gas nuclei tends to be weak. When the maximum size of the outer outline of the nano filler is less than or equal to 3 mu m, the generation of gas nuclei can be effectively induced, and the foaming rate of the core layer is improved. By defining the maximum size range of the outer profile of the nanofiller, the formation of microcellular foam structures in engineering plastic materials is facilitated.

In addition, in the micro-foaming injection molding process, the nano filler can obviously reduce the cell diameter of the foaming material and increase the cell density of the foaming material. The smaller the diameter of the foam holes of the foaming material is, the smaller the loss of the mechanical property of the material is, and deformation failure caused by the loss of the mechanical property in the high-temperature reliability test process of the microporous foaming shell is avoided.

According to one embodiment of the invention, the nanofiller is present in an amount of 0.1wt% to 3wt% based on the total weight of the feedstock, i.e. the weight percentage of nanofiller is 0.1wt% to 3wt%, including the endpoints thereof 0.1wt% and 3wt%. If the weight percentage of the nanofiller is less than 0.1wt%, agglomeration tends to be caused, and the influence on lowering the foaming pore size becomes small, and it is difficult to form cells meeting the demand. If the weight percentage of the nanofiller is more than 3wt%, it is liable to cause deterioration of dispersion uniformity of the nanofiller in the engineering plastic material, which may cause increase of defects of the foaming material of the core layer 112 and deterioration of mechanical properties. When the nano filler accounts for 0.1-3wt% of the mass of the raw material, the nano filler can be uniformly distributed in the engineering plastic material in the process of micro-foaming injection molding, so that uniform distribution of cells in the core layer 112 and pore diameter control of the cells are facilitated, the shell 10 has the advantage of low density, and the shell 10 can be ensured to have excellent mechanical properties.

Wherein, the mass percent of the preferable nano filler is 0.5 to 1.5 weight percent, at this time, the weight of the microporous foam shell can be reduced, the formation of cells is facilitated, and the mechanical property of the shell 10 is ensured. Alternatively, the nanofiller may comprise 0.1wt%, 0.5wt%, 1wt%, 1.5wt%, 2wt%, 2.5wt%, 3wt% and the like of the feedstock.

According to one embodiment of the invention, the microcellular foam shell has a density of 0.8g/cm ³～1.2g/cm³, including its endpoints of 0.8g/cm ³ and 1.2g/cm ³. It should be noted that if the density of the microcellular foam is less than 0.8g/cm ³, the microcellular foam tends to be low in strength; if the density of the microcellular foam is greater than 1.2g/cm ³, the microcellular foam will be heavier, thereby increasing the weight of the sound generating apparatus 100. When the density of the microporous foam shell is 0.8g/cm ³～1.2g/cm³, the shell 10 can have the advantages of high strength and small density, that is, can meet the requirement of light weight of the sound generating device 100 and can also meet the requirement of strength of the sound generating device 100. Alternatively, the density of the microcellular foam shell is 0.8g/cm ³、0.9g/cm³、1.0g/cm³、1.15g/cm³、1.20g/cm³ or the like, which enables the sound generating device 100 to be lightweight and high-strength.

According to one embodiment of the invention, the flexural modulus of the microporous foam shell is not less than 3GPa, i.e. the flexural modulus of the microporous foam shell is not less than 3GPa. If the flexural modulus of the microcellular foam case is less than 3.5GPa, the strength of the microcellular foam case is liable to be insufficient, and the sound generating apparatus 100 assembled by the microcellular foam case is liable to resonate. Therefore, by making the flexural modulus of the microcellular foam shell not smaller than 3.5GPa, it is advantageous to improve the acoustic performance and mechanical properties of the acoustic device 100. When the flexural modulus is not less than 3.5GPa, the flexural modulus of the microcellular foam housing of the present embodiment can be made to satisfy the flexural modulus requirement of the housing 10 of the acoustic generating device 100. Alternatively, the flexural modulus of the microporous foam shell is 3GPa, 4GPa, 5GPa, 6GPa, 7GPa, 8GPa or 10GPa, etc., so that the structural strength of the microporous foam shell can meet the use requirements of the sound generating device 100.

The test principle of the flexural modulus of the microporous foam shell is referred to GB/T9341-2008, and the specific test method comprises the following test speed: 2mm/min, taking a flat part with uniform thickness on the shell 10, wherein the width b of the sample is 5mm; the diameter of the pressure head is 2mm; when the thickness of the sample is less than 1mm, the test span is 5mm; when the thickness of the sample is 1 mm-1.5 mm, the test span is 6mm; when the thickness of the sample is 1.5 mm-2 mm, the test span is 7mm; 5 bars were tested and averaged.

According to one embodiment of the invention, the heat distortion temperature of the microcellular foam shell is greater than or equal to 130 ℃. Specifically, under the condition that the bending stress is 1.8MPa, the thermal deformation temperature of the microporous foam shell is not less than 130 ℃, and the microporous foam shell can be ensured to have high-temperature reliability. It should be noted that if the heat distortion temperature is less than 130 ℃, the heat distortion temperature will result in poor temperature resistance of the case 10. By limiting the heat distortion temperature of the microporous foam housing to not less than 130 ℃, the heat distortion temperature of the microporous foam housing of the present embodiment is easy to satisfy the requirement of high temperature resistance of the housing 10 of the sound generating apparatus 100, so that it can be normally used in a conventional environment and a part of extreme environments.

The testing principle of the heat distortion temperature can be referred to GB/T1634..1-2004, and the specific testing method is as follows:

1) Taking a flat part with uniform thickness on the shell 10, wherein the length, width and height dimensions are 80 multiplied by 10 multiplied by 4mm, the span is 64mm, the bending stress is 1.8MPa, the heating rate is 120 ℃/h, and the standard deflection is 0.34mm;

2) When the length, width and height dimensions are < (80X 10X 4 mm), the spline dimensions can be 15X 5X h (h is the thickness of the shell 10), the span is 10mm, the bending stress is 1.8MPa, the heating rate is 120 ℃/h, and the standard deflection calculation method is as follows: The calculation method refers to GB/T1634.1-2004.

According to one embodiment of the present invention, the housing 10 includes a first sub-housing and a second sub-housing, the first sub-housing and the second sub-housing are adhered or integrally injection molded, the first sub-housing is formed as a microcellular foam housing, and the second sub-housing is prepared by at least one of steel, aluminum alloy, copper alloy, titanium alloy, PP and its modified material, PA and its modified material, PET and its modified material, PBT and its modified material, PPs and its modified material, PEI and its modified material, PEEK and its modified material, PEN and its modified material, PPA and its modified material, PC and its modified material, SPS and its modified material, TPX and its modified material, POM and its modified material, and LCP and its modified material.

That is, as shown in fig. 1, the housing 10 of the sound generating apparatus 100 according to the embodiment of the present invention may be assembled by a first sub-housing and a second sub-housing, which may be connected by bonding, or may be assembled by injection molding or the like. The first sub-shell is mainly made of a microporous foam shell, and the second sub-shell can be made of metal materials such as steel, aluminum alloy, copper alloy, titanium alloy and the like, and also can be made of PP and modified materials thereof, PA and modified materials thereof, PET and modified materials thereof, PBT and modified materials thereof, PPS and modified materials thereof, PEI and modified materials thereof, PEEK and modified materials thereof, PEN and modified materials thereof, PPA and modified materials thereof, PC and modified materials thereof, SPS and modified materials thereof, TPX and modified materials thereof, POM and modified materials thereof, LCP and modified materials thereof and the like.

As can be seen from the above embodiments, the housing 10 of the sound generating device 100 made of the engineering plastic material according to the embodiment of the invention has the advantages of low density, high modulus, and the like, and can meet the requirements of mechanical properties, and light weight.

The present invention also provides a sound generating apparatus 100 comprising the housing 10 of the sound generating apparatus 100 of any of the above embodiments. The sound generating device 100 further comprises a sound generating unit 20 arranged in the shell 10, and electroacoustic conversion is performed through the sound generating unit 20, so that sound generating performance of the sound generating device 100 is realized. The sounding unit 20 may be a speaker unit. At least a part of the housing 10 of the sound generating device 100 is made of the microporous foam housing according to any of the embodiments, so that not only the acoustic performance of the sound generating device 100 can be satisfied, but also the design requirements of the light and thin sound generating device 100 and mechanical properties can be satisfied, and the applicability of the sound generating device 100 in various electronic devices is improved.

When the sound generating device 100 is manufactured by the housing 10 and the sound generating unit 20 according to the embodiment of the present invention, the housing 10 of the sound generating device 100 may be manufactured by a micro-foaming injection molding process, and the speaker unit, that is, the sound generating unit 20 is accommodated in the housing 10. The speaker unit includes a vibration system and a magnetic circuit system.

The housing 10 of the sound generating device 100 may include an upper case 11 and a lower case 12, wherein a speaker unit is first fixed on the upper case 11 or the lower case 12, and then the upper case 11 and the lower case 12 are welded into one body through an ultrasonic welding or glue bonding process, etc., to complete the assembly of the sound generating device 100. Wherein the upper shell 11 may be composed entirely of the first sub-shell, or at least by the first sub-shell and the second sub-shell. The lower shell 12 may also be composed entirely of the first sub-shell, or at least by the first and second sub-shells.

The housing 10 of the sound generating apparatus 100 may also include an upper case 11, a middle case, and a lower case 12, with the upper case 11 being connected to the lower case 12 through the middle case. At least a portion of at least one of the upper shell 11, the middle shell, and the lower shell 12 is made of a microcellular foam shell, i.e., all of at least one of the upper shell 11, the middle shell, and the lower shell 12 is made of a microcellular foam shell, and a portion of at least one of the upper shell 11, the middle shell, and the lower shell 12 is made of a microcellular foam shell.

Optionally, the sound generating device 100 is manufactured by extruding and granulating engineering plastic materials, reinforcing agents and nano fillers by using double screws, and then forming the microporous foam shell by using a micro-foaming injection molding process.

For example, the production is carried out by adopting a double-screw modified granulating process, mixing engineering plastic resin and nano filler uniformly by a high-speed mixer, adding into a main feeding port of a double-screw extruder, adding reinforcing agent into a side feeding port after the resin is melted, shearing and mixing uniformly in the extruder, extruding and granulating. When the reinforcing agent is a fiber material, the length-diameter ratio of the fiber material is large, and the shearing resistance is general, so that the fiber material can be added after the plastic particles are melted, the damage of the fiber material can be effectively reduced, and the reinforcing effect of the fiber on the material is improved.

Because the surface energy of the reinforcing agent and the surface energy of the engineering plastic material are greatly different, the reinforcing agent can be subjected to surface treatment, and the compatibility of the reinforcing agent and the engineering plastic material is improved. The surface treatment method can be used for carrying out surface modification through a coupling agent, for example, vinyl triethoxysilane, vinyl trimethoxysilane, gamma-methacryloxypropyl triethoxysilane, gamma-aminopropyl trimethoxysilane and gamma-aminopropyl triethoxysilane can be used for modifying glass fibers and nano fillers, and the binding force between the reinforcing agent and the engineering plastic material is improved.

Optionally, adding the engineering plastic material particles added with the reinforcing agent and the nano filler into a micro-foaming injection molding machine, injecting N ₂ and/or CO ₂ gas into the plastic melt by using high-pressure equipment after the plastic particles are melted, and then injecting the plastic melt into a mold to form the micro-porous foaming shell.

The invention also provides an electronic device comprising the sound generating apparatus 100 of any of the above embodiments. The electronic device may be a mobile phone, a notebook computer, a tablet computer, a VR (virtual reality) device, an AR (augmented reality) device, a TWS (real wireless bluetooth) headset, an intelligent sound box, etc., which is not limited in this aspect of the invention.

Since the housing 10 of the sound generating device 100 according to the above embodiment of the present invention has the above technical effects, the sound generating device 100 and the electronic apparatus according to the embodiments of the present invention also have the corresponding technical effects, that is, the housing 10 of the sound generating device 100 has lighter weight while satisfying the mechanical properties and the mechanical properties requirements, thereby realizing the weight reduction of the electronic apparatus product.

The housing 10 of the sound generating apparatus 100 of the present invention will be described in detail with reference to specific embodiments and comparative examples.

Comparative example 1

In this comparative example, the speaker module was assembled from a housing and a speaker unit. When the shell is prepared, 80wt% of PC is used as matrix resin, 20wt% of glass fiber is added as reinforcing agent, and after modified granulation by a double screw extruder, the shell with a single-layer structure is manufactured by adopting a common injection molding process.

Comparative example 2

In this comparative example, the speaker module was assembled from a housing and a speaker unit. When the shell is prepared, 76 weight percent of PC is used as matrix resin, 20 weight percent of glass fiber is added as reinforcing agent, 4 weight percent of trihydrazino triazine is used as foaming agent, and the shell with a single-layer structure is prepared by adopting a common injection molding process after modified granulation by a double-screw extruder.

Comparative example 3

In this comparative example, the speaker module was assembled from a housing and a speaker unit. When the shell is prepared, 80 weight percent of PA66 is used as matrix resin, 20 weight percent of glass fiber is added as reinforcing agent, and the shell with a single-layer structure is manufactured by adopting a common injection molding process after modified granulation by a double-screw extruder.

Comparative example 4

In this embodiment, the speaker module is assembled by a housing and a speaker unit. When the shell is prepared, 80 weight percent of PPA is used as matrix resin, 20 weight percent of glass fiber is added as reinforcing agent, and after modified granulation by a double screw extruder, the shell with a single-layer structure is manufactured by adopting a common injection molding process.

Comparative example 5

In this embodiment, the speaker module is assembled by a housing and a speaker unit. When the shell is prepared, 80wt% of PEI is used as matrix resin, 20wt% of glass fiber is added as reinforcing agent, and after modified granulation by a double-screw extruder, the shell with a single-layer structure is prepared by adopting a common injection molding process.

Example 1

In this embodiment, the speaker module is assembled by the housing 10 and the speaker unit. When the shell is prepared, 79.9 weight percent of PC is used as matrix resin, 20 weight percent of glass fiber is added as reinforcing agent, 0.1 weight percent of nano silicon dioxide is used as nano filler, and the shell 10 is manufactured by adopting a micro-foaming injection molding process after modified granulation by a double-screw extruder. The shell 10 has a three-layer structure, i.e., a first skin layer 111, a core layer 112, and a second skin layer 113.

Example 2

In this embodiment, the speaker module is assembled by the housing 10 and the speaker unit. When the shell is prepared, 79wt% of PC is used as matrix resin, 20wt% of glass fiber is added as reinforcing agent, 1wt% of nano silicon dioxide is used as nano filler, and after modified granulation by a double screw extruder, the shell 10 is manufactured by adopting a micro-foaming injection molding process. The shell 10 has a three-layer structure, i.e., a first skin layer 111, a core layer 112, and a second skin layer 113.

Example 3

In this embodiment, the speaker module is assembled by the housing 10 and the speaker unit. When the shell is prepared, 78.5 weight percent of PC is used as matrix resin, 20 weight percent of glass fiber is added as reinforcing agent, 1.5 weight percent of nano silicon dioxide is used as nano filler, and the shell 10 is manufactured by adopting a micro-foaming injection molding process after modified granulation by a double-screw extruder. The shell 10 has a three-layer structure, i.e., a first skin layer 111, a core layer 112, and a second skin layer 113.

Example 4

In this embodiment, the speaker module is assembled by the housing 10 and the speaker unit. When the shell is prepared, 78wt% of PA66 is used as matrix resin, 20wt% of glass fiber is added as a reinforcing agent, 2wt% of nano mica sheets are used as nano fillers, and after modified granulation by a double-screw extruder, the shell 10 is manufactured by adopting a micro-foaming injection molding process. The shell 10 has a three-layer structure, i.e., a first skin layer 111, a core layer 112, and a second skin layer 113.

Example 5

In this embodiment, the speaker module is assembled by the housing 10 and the speaker unit. When the shell is prepared, 77 weight percent of PPA is used as matrix resin, 20 weight percent of glass fiber is added as reinforcing agent, 3 weight percent of nano calcium carbonate is used as nano filler, and after modified granulation by a double screw extruder, the shell 10 is manufactured by adopting a micro-foaming injection molding process. The shell 10 has a three-layer structure, i.e., a first skin layer 111, a core layer 112, and a second skin layer 113.

Example 6

In this embodiment, the speaker module is assembled by the housing 10 and the speaker unit. When the shell is prepared, 79.9 weight percent of PEI is used as matrix resin, 20 weight percent of glass fiber is added as reinforcing agent, 0.1 weight percent of carbon nano tube is used as nano filler, and the shell 10 is manufactured by adopting a micro-foaming injection molding process after modified granulation by a double-screw extruder. The shell 10 has a three-layer structure, i.e., a first skin layer 111, a core layer 112, and a second skin layer 113.

For comparison, the proportions of the raw materials and the molding processes of comparative examples 1 to 5 and examples 1 to 6 are listed in table 1 below.

TABLE 1 Material composition and Forming Process

The materials and products of comparative examples 1 to 5 and examples 1 to 6 were tested as follows.

(1) The shells prepared in examples 1 to 6 and the shells 10 prepared in comparative examples 1 to 5 were subjected to tests of cell average pore diameter, density, flexural modulus, heat distortion temperature and notched Izod impact strength, and the test results are shown in Table 2 below.

Table 2 performance comparison

As can be seen from Table 1, comparative example 1 uses a general injection molding process, and the density of the shell material of comparative example 1 obtained in combination with Table 2 is 1.35g/cm ³, that is, the weight of the shell obtained by the general injection molding process in comparative example 1 is large.

It can be seen from table 1 that comparative example 2 employs a compression foaming process. As can be seen in connection with table 2, the average cell size of the shell of comparative example 2 was 150 μm to 220 μm, and the average cell size of the shell of comparative example 2 was larger than that of examples 1 to 6. In addition, the density of comparative example 2 was 1.02g/cm ³, which had a lower density, but the flexural modulus of the case was 1.12MPa, and it was found that the flexural modulus of the case of comparative example 2 was drastically reduced, and the product requirements could not be satisfied at all.

As can be seen from the combination of table 1 and table 2, PA66 is used as the matrix resin in comparative example 3, PPA is used as the matrix resin in comparative example 4, PEI is used as the matrix resin in comparative example 5, no cells exist in the obtained shell, and the weight of the shell is large, which does not meet the requirement of light weight.

As can be seen from table 1, examples 1 to 3 each use PC as a matrix resin, and the content of the reinforcing agent in examples 1 to 3 is the same and the content of the nanofiller is different. Specifically, the nanofiller of example 1 was the least and the nanofiller of example 3 was the most. As can be seen from Table 2, the average cell size of example 1 was 10 μm to 30. Mu.m, the average cell size of example 2 was 1 μm to 20. Mu.m, and the average cell size of example 3 was 1 μm to 15. Mu.m. Further, as can be seen from Table 2, the flexural modulus of example 1 was 4.7MPa, the flexural modulus of example 2 was 5.1MPa, and the flexural modulus of example 3 was 5.2MPa. The notched Izod impact strength of example 1 was 9kJ/m ², that of example 2 was 11kJ/m ², and that of example 3 was 14kJ/m ². It can be seen that as the content of the nano silica filler increases in examples 1, 2 and 3, the average diameter of the bubble holes decreases, the flexural modulus increases, the notched impact strength increases and the toughness increases.

As can be seen from table 1, example 4 and comparative example 3 both use PA66 as the matrix resin and glass fiber as the reinforcing agent, except that nano mica flakes were used as nano fillers in example 4 and no nano fillers were contained in comparative example 3. PPA was used as the matrix resin in example 5 and comparative example 4, and glass fiber was used as the reinforcing agent, except that nano calcium carbonate was used as the nano filler in example 5, and no nano filler was contained in comparative example 4. In example 6 and comparative example 5, PEI was used as the matrix resin and glass fiber was used as the reinforcing agent, except that carbon nanotubes were used as the nanofiller in example 6 and no nanofiller was contained in comparative example 5. And the micro foaming injection molding process was used in examples 4 to 6, and the general injection molding process was used in comparative examples 3 to 5.

As can be seen from table 2, the flexural modulus of example 4 was 5.2MPa, the flexural modulus of example 5 was 4.8MPa, and the flexural modulus of example 6 was 4.7MPa. The flexural modulus of comparative example 3 was 6.9MPa, the flexural modulus of example 5 was 5.5MPa, and the flexural modulus of example 6 was 5.5MPa. The density of the housing 10 of example 4 was 1.09g/cm ³, the density of the housing 10 of example 5 was 1.1g/cm ³, and the density of the housing 10 of example 6 was 1.17g/cm ³. It can be seen that, in examples 4,5 and 6, the housing 10 was prepared by the micro-foaming process, and compared with the housings of comparative examples 3, 4 and 5, the flexural modulus was not significantly reduced, but the density was significantly reduced, so that the light weight objective was achieved on the basis of meeting the reliability verification requirements of the speaker module.

(2) The housings prepared in examples 1 to 6 and the housings 10 prepared in comparative examples 1 to 5 were assembled with speaker monomers, respectively, to obtain different speaker modules, and drop reliability, high-temperature high-humidity reliability, high-power reliability, and high-low-temperature cycle reliability were tested for each speaker module, respectively, and the test results are shown in table 3 below.

Table 3 reliability results comparison table

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The reliability test conditions in table 3 are as follows:

The reliability test conditions were as follows:

Drop reliability: the shells fall from a height of 1.5m for 200 times per wheel, and 3 wheels are carried out in total; and judging the standard, namely judging OK without breakage and cracking of the shell, and judging NG if not.

High temperature and high humidity reliability test: the loudspeaker module is placed in an environment with 85 ℃ and 85% humidity, and is operated for 72 hours at rated voltage 1.2 times, and the size variation of the shell of the loudspeaker module is tested; determination criteria: when the change in the size of the speaker module case exceeds 5s (s is a wire, 10 μm is 1 s), that is, NG is determined, and when the change in the size of the case is less than 5s, OK is determined.

High power reliability: the loudspeaker module is placed at normal temperature and operated for 96 hours with 1.2 times of rated power; determination criteria: the size variation of the speaker module case is less than 5s, the OK is judged when the noise is not obvious, the size variation is more than 5s, or the NG is judged when the noise is heard.

High low temperature cycle reliability: placing the loudspeaker module in an environment of-30 ℃ for 2 hours, then transferring to an environment of 80 ℃ for 2 hours, and circulating for 30 times, wherein the size of the shell of the loudspeaker module changes; determination criteria: when the change in the size of the speaker module case exceeds 5s (s is a wire, 10 μm is 1 s), that is, NG is determined, and when the change in the size of the case is less than 5s, OK is determined.

As can be seen from a combination of tables 2 and 3, comparative example 2 fails to satisfy drop reliability, high temperature and high humidity reliability, high power reliability, and high and low temperature cycle reliability. Although comparative example 1, comparative example 3, comparative example 4, comparative example 5 can meet the reliability verification requirement, the densities of comparative example 1, comparative example 3, comparative example 4, and comparative example 5 are higher. In addition, although comparative example 2 had a lower density, its flexural modulus was severely reduced and notched impact strength was low, resulting in easy breakage and failure of the enclosure by dropping during reliability, and serious deformation of the enclosure size, resulting in failure of the speaker.

As can be seen from table 2, the density of the case 10 in each of examples 1 to 6 was significantly reduced, but the decrease in flexural modulus was small, and the reliability verification requirement was still satisfied.

Therefore, in comparative examples 1 to 5, the addition of glass fiber in the PC material resulted in a large mass of the housing of the speaker module due to a large density of glass fiber, which resulted in an excessive weight of the whole electronic device, and affected the use experience of consumers. And after the glass fiber is added into the PC material, the toughness of the PC material is reduced while the rigidity of the PC material is improved, so that the PC material can be broken and failed in the falling reliability. The microporous foam shell is made of engineering plastic materials, and the engineering plastic materials comprise the first surface layer 111, the core layer 112 and the second surface layer 113, so that the waterproof effect can be improved, the density can be reduced, and the weight of the loudspeaker module can be reduced. In addition, the pore diameter of the micropore foaming shell is effectively reduced by adding the nano filler with a specific content into the engineering plastic material, and meanwhile, the toughness of the shell 10 is improved, and the impact strength of the micropore foaming shell is improved. And the prepared microporous foam shell has the advantages of small modulus reduction, low density, high toughness, capability of meeting the requirements of light weight and reliability of a loudspeaker module, and the like.

While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. The shell of the sound generating device is characterized in that at least one part of the shell is a microporous foam shell, raw materials of the microporous foam shell comprise engineering plastic materials, the microporous foam shell is an integrated part formed by foaming and injection molding of the raw materials, and the microporous foam shell comprises a first surface layer, a core layer and a second surface layer which are sequentially laminated;

2. The sound emitting device housing of claim 1, wherein the engineering plastic material comprises at least one of poly 4 methyl-1-pentene, polypropylene, syndiotactic polystyrene, PA66, PA6, PA68, PA610, PA612, PA9, PA1010, PA1012, PA11, PA12, PA1212, PA1313, PPA, PEI, polycarbonate, polyoxymethylene, polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polyarylate, polyetheretherketone, liquid crystal polymer.

3. The sound emitting device housing of claim 1, wherein the raw material further comprises a reinforcing agent comprising at least one of glass fibers, carbon fibers, basalt fibers, and polymer fibers.

4. A housing for a sound emitting device according to claim 3 wherein the enhancer comprises 10wt% to 40wt% of the total weight of the raw materials.

5. The sound emitting device housing of claim 1, wherein the feedstock further comprises a nanofiller comprising at least one of silica, carbon black, clay, carbon nanotubes, calcium carbonate, cellulose, montmorillonite, aluminum oxide, graphene oxide, talc, mica powder, kaolin, wollastonite, diatomaceous earth, titanium dioxide.

6. The sound emitting device housing of claim 5, wherein the outer profile of the nanofiller has a maximum dimension of 3 μm or less.

7. The sound emitting device housing of claim 5, wherein the nanofiller comprises 0.1wt% to 3wt% of the raw material.

8. The sound emitting device housing of claim 1, wherein the microcellular foam housing has a density of 0.8g/cm ³～1.2g/cm³.

9. The sound emitting device housing of claim 1, wherein the microcellular foam housing has a flexural modulus of 3GPa or greater.

10. The sound emitting device housing of claim 1, wherein the microcellular foam housing has a heat distortion temperature of greater than or equal to 130 ℃.

11. The housing of a sound emitting device according to any one of claims 1-10, wherein the housing comprises a first sub-housing and a second sub-housing, the first sub-housing being bonded or integrally injection molded with the second sub-housing, the first sub-housing being formed as the microporous foam housing, the second sub-housing being made of at least one of steel, aluminum alloy, copper alloy, titanium alloy, PP and its modified material, PA and its modified material, PET and its modified material, PBT and its modified material, PPs and its modified material, PEI and its modified material, PEEK and its modified material, PEN and its modified material, PPA and its modified material, PC and its modified material, SPS and its modified material, TPX and its modified material, POM and its modified material, and LCP and its modified material.

12. A sound emitting device, comprising:

The housing of a sound emitting device according to any one of claims 1-11.

13. An electronic device comprising the sound emitting apparatus according to claim 12.