CN115499765B

CN115499765B - Shell of sound generating device, sound generating device and electronic equipment

Info

Publication number: CN115499765B
Application number: CN202211119557.8A
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: 2024-09-13
Anticipated expiration: 2042-09-14
Also published as: CN115499765A

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 made of a modified polyamide material, the raw materials of the modified polyamide material comprise a polyamide base material and a filler dispersed in the polyamide base material, and the filler comprises at least one of lamellar nano filler and fibrous nano filler; wherein the layered nanofiller has a lateral dimension extending in a first plane and a longitudinal dimension extending in a second plane, the ratio of the lateral dimension to the longitudinal dimension of the layered nanofiller being 50:1 to 200:1; and/or the ratio of the length to the diameter of the fibrous nano filler is 50:1-200:1. According to the shell of the sound generating device, the lamellar nano filler and the fibrous nano filler in the composition materials have the effect of inducing crystallization, so that the crystallization rate of the polyamide material can be improved, the polyamide material can be completely crystallized in the injection molding process, and the dimensional stability of the shell is obviously improved.

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.

Conventional speaker housings are usually prepared by adding glass fiber reinforced materials to PC (polycarbonate) materials, however, glass fiber materials have poor reinforcing effects on PC materials, for example, when the flexural modulus of the speaker housing needs to reach 5GPa, glass fibers of 20wt% or more are generally 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. As the amount of glass fiber added increases, the density of the speaker enclosure becomes greater, resulting in a greater weight of the speaker enclosure.

Therefore, a new technical solution is needed to meet the requirements of light weight, high structural strength, high modulus, high dimensional stability, and the like.

Disclosure of Invention

An object of the present invention is to provide a housing for a sound generating apparatus, which can solve the problems of low modulus and poor dimensional stability of the housing of 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 of the embodiment of the first aspect of the present invention, at least a part of the shell is made of a modified polyamide material, and a raw material of the modified polyamide material comprises a polyamide base material and a filler dispersed in the polyamide base material, wherein the filler comprises at least one of a layered nano filler and a fibrous nano filler; wherein the layered nanofiller has a lateral dimension extending in a first plane and a longitudinal dimension extending in a second plane, the ratio of the lateral dimension to the longitudinal dimension of the layered nanofiller being 50:1 to 200:1; and/or the ratio of the length to the diameter of the fibrous nano filler is 50:1-200:1.

According to some embodiments of the invention, the layered nanofiller has a lateral dimension of 1nm to 100nm; and/or the diameter of the fibrous nano filler is 10 nm-500 nm.

According to some embodiments of the invention, the layered nanofiller comprises an inorganic nanoflakes comprising: at least one of talcum nano-sheet, mica nano-sheet, clay nano-sheet, montmorillonite nano-sheet, vanadium pentoxide nano-sheet, molybdenum disulfide nano-sheet, tungsten disulfide nano-sheet, titanium dioxide nano-sheet and phosphate nano-sheet.

According to some embodiments of the invention, the layered nanofiller is present in an amount of 0.5wt% to 10wt% based on the total amount of the feedstock.

According to some embodiments of the invention, the fibrous nanofiller comprises: at least one of poly (paraphenylene terephthalamide) nanofibers, poly (paraphenylene isophthalamide) nanofibers, and polyimide nanofibers.

According to some embodiments of the invention, the fibrous nanofiller is present in an amount of 0.1wt% to 2wt% based on the total amount of the feedstock.

According to some embodiments of the invention, the polyamide binder comprises: at least one of PPA, PA6T, PA, T, PA, T, PA, PA66, PA6, PA68, PA610, PA612, PA9, PA1010, PA1012, PA11, PA12, PA1212, PA 1313.

According to some embodiments of the invention, the filler further comprises: the hollow microsphere filler comprises inorganic hollow microspheres and/or organic hollow microspheres, wherein the inorganic hollow microspheres comprise glass hollow microspheres and/or ceramic hollow microspheres, and the organic hollow microspheres comprise phenolic hollow microspheres and/or polystyrene hollow microspheres.

According to some embodiments of the invention, the content of the hollow microsphere filler is 5wt% to 40wt% of the total weight of the raw materials.

According to some embodiments of the invention, the flexural modulus of the housing is not less than 3.5GPa.

According to some embodiments of the invention, the heat distortion temperature of the housing is not less than 145 ℃.

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 made of the modified polyamide material, and the second sub-housing is made of 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 sound generating device, at least one part of the shell is prepared from the modified polyamide material, the raw materials of the modified polyamide material comprise a polyamide base material and a filler dispersed in the polyamide base material, the filler comprises at least one of a layered nano filler and a fibrous nano filler, the layered nano filler and the fibrous nano filler have a reinforcing effect and an induced crystallization effect, and the crystallization rate of the polyamide material can be improved, so that the layered nano filler and the fibrous nano filler can play a role of a heterogeneous nucleating agent in the injection molding process, the crystallization of the polyamide material is induced, the crystallization rate of polyamide at a high temperature is improved, the polyamide material can be crystallized faster, the polyamide material can be completely crystallized, the dimensional stability of the shell is remarkably improved, and the modulus of the shell is improved.

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 structural view of a sound emitting device according to an embodiment of the present invention.

Reference numerals

A sound generating device 100;

a housing 10; an upper case 11; 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 following describes in detail the housing 10 of the sound generating device 100 according to the embodiment of the present invention with reference to the accompanying drawings, wherein the sound generating device 100 may be a speaker sound generating module.

At least a portion of the housing 10 of the sound emitting device 100 according to the embodiment of the present invention is made of a modified polyamide material, the raw materials of which include a polyamide base material and a filler dispersed in the polyamide base material, the filler including at least one of a layered nanofiller and a fibrous nanofiller. Wherein the layered nanofiller has a lateral dimension extending in a first plane and a longitudinal dimension extending in a second plane, the ratio of the lateral dimension to the longitudinal dimension of the layered nanofiller being 50:1 to 200:1; and/or the ratio of the length to the diameter of the fibrous nano-filler is 50:1-200:1.

In other words, all or part of the housing 10 of the sound generating device 100 may be mainly prepared by a modified polyamide material, wherein the raw materials of the modified polyamide material comprise a polyamide base material and a filler, and the filler is filled inside the polyamide base material. The filler may be a layered nanofiller, a fibrous nanofiller, or both a layered nanofiller and a fibrous nanofiller. In preparing the housing 10, the modified polyamide material may be prepared from the polyamide base material and the filler, and then the housing 10 may be prepared from the modified polyamide material. For example, the modified polyamide material is prepared by uniformly dispersing the layered nanofiller and/or the fibrous nanofiller in the polyamide material, and then the modified polyamide material is injection-molded to obtain the housing 10.

It should be noted that, the layered nanofiller or the fibrous nanofiller has a strong reinforcing effect, for example, the modulus and the heat distortion temperature of the polyamide material are significantly improved, and the mechanical property and the temperature resistance of the shell 10 are further improved. In addition, the layered nano-filler and the fibrous nano-filler have the effect of inducing crystallization, and can remarkably improve the crystallization rate of the polyamide material, so that the polyamide material can be completely crystallized in the injection molding process, and the dimensional stability of the shell 10 is remarkably improved.

The layered nanofiller and the fibrous nanofiller are described in detail below.

Firstly, for the layered nano-filler, the layered nano-filler has the characteristics of high strength, high modulus, high barrier and higher specific surface area; the lamellar nano filler is dispersed in the polyamide material, so that the polyamide molecular chain and the lamellar nano filler have good bonding effect, and acting force acting on the polyamide material can be transferred to the lamellar nano filler, so that the polyamide material has good reinforcing effect. In addition, the layered nanofiller has a better barrier effect due to the size effect. By filling the layered nanofiller in the polyamide material, not only can the polyamide material be reinforced, but also the degree and efficiency of crystallization of the polyamide material can be improved, and the dimensional stability of the prepared shell 10 can be improved.

Secondly, for the fibrous nano-filler, the fibrous nano-filler has the characteristics of large length-diameter ratio, higher specific surface area, high strength, high toughness, low density, good compatibility with a resin matrix and the like; the polyamide material molecular chain has good compatibility with the fibrous nano filler, so that the polyamide molecular chain has more bonding points on the fibrous nano filler, and the force acting on the polyamide material can be transferred to the fibrous nano filler, so that the high strength and high modulus of the fibrous nano filler are fully utilized, and the effects of low addition and high enhancement efficiency are achieved; the fibrous nano filler has small self density and small addition amount, so that the density increase of the polyamide material is small, and the weight reduction of the polyamide material is facilitated. In addition, the fibrous nano filler has larger specific surface area, so the fibrous nano filler has better reinforcing efficiency. By filling the fibrous nanofiller in the polyamide material, not only the degree of crystallization and the crystallization efficiency of the polyamide material are improved, but also the dimensional stability of the produced housing 10 is improved, and the weight of the housing 10 can be reduced.

In addition, the layered nanofiller has a lateral dimension extending in a first plane and a longitudinal dimension extending in a second plane, for example, the layered nanofiller extends in a horizontal direction, and a thickness direction of the layered nanofiller may extend in an up-down direction, in which case the horizontal direction may be defined as the first plane and the up-down direction as the second plane. It should be noted that, the first plane and the second plane are not limited to a perpendicular relationship, and may have an included angle therebetween, and the range of the included angle is not limited herein.

According to one embodiment of the invention, the ratio of the transverse dimension to the longitudinal dimension of the layered nanofiller is 50:1 to 200:1; and/or the ratio of the length to the diameter of the fibrous nano-filler is 50:1-200:1. That is, the filler may satisfy at least one of the following conditions: the ratio of the transverse dimension to the longitudinal dimension of the layered nano-filler is 50:1-200:1; and the ratio of the length to the diameter of the fibrous nano filler is 50:1-200:1. Specifically, it is within the scope of the present invention that either of two conditions are met.

Wherein, when the ratio of the transverse dimension to the longitudinal dimension of the layered nano-filler is 50:1-200:1, the end points 50:1 and 200:1 are included. It should be noted that, the reinforcing effect of the layered nano-filler on the shell 10 has a close relationship with the size of the layered nano-filler, when the polyamide material is stressed, the polyamide material acts on the polyamide molecular chain first and then is transferred to the layered nano-filler combined with polyamide, and the larger the ratio of the transverse size to the longitudinal size is, the more the properties of high strength and high modulus of the layered filler can be utilized; if the ratio of the transverse dimension to the longitudinal dimension of the layered nanofiller is less than 50:1, this will result in a lower reinforcing effect on the polyamide material; if the ratio of the transverse dimension to the longitudinal dimension of the layered nano filler is more than 200:1, the layered nano filler is easily sheared and broken in the processing process, the reinforcing effect is poor, the process stability of the polyamide material is poor, and the batch performance difference of the material is large; therefore, when the ratio of the transverse dimension to the longitudinal dimension of the layered nano filler is 50:1-200:1, the layered nano filler has a high reinforcing effect on the polyamide material and is beneficial to the stability of the quality of the shell 10 product. Optionally, the ratio of the transverse dimension to the longitudinal dimension of the layered nanofiller is 50:1, 55:1, 60:1, 100:1, 150:1, 200:1, etc.

The end point values 50:1 and 200:1 are included when the ratio of the length to the diameter of the fibrous nanofiller is 50:1 to 200:1. The reinforcing effect of the fibrous nano-filler on the shell 10 is closely related to the size of the fibrous nano-filler, when the polyamide material is stressed, the fibrous nano-filler firstly acts on a polyamide molecular chain and then is transferred to the fibrous nano-filler combined with polyamide, and the larger the ratio of the length size to the diameter size of the fibrous nano-filler is, the more the properties of high strength and high modulus of the lamellar filler can be utilized; if the ratio of the length to the diameter of the fibrous nanofiller is less than 50:1, this will result in a lower reinforcing effect on the polyamide material; if the ratio of the length to the diameter of the fibrous nano-filler is greater than 200:1, the fibrous nano-filler is easily sheared and broken in the processing process, the reinforcing effect is deteriorated, the process stability of the polyamide material is poor, and the batch performance of the material is greatly different. It can be seen that the fibrous nanofiller of the present invention can improve the strength, modulus and dimensional stability of the shell 10 when the ratio of the length to the diameter is 50:1 to 200:1. Optionally, the fibrous nanofiller has a length to diameter ratio of 50:1, 55:1, 60:1, 100:1, 150:1, 200:1, etc.

Therefore, at least a part of the housing 10 of the sound emitting device 100 of the present invention is prepared from a modified polyamide material, the raw materials of the modified polyamide material include a polyamide base material and a filler dispersed in the polyamide base material, the filler includes at least one of a layered nano filler and a fibrous nano filler, and the layered nano filler and the fibrous nano filler have not only a reinforcing effect but also an effect of inducing crystallization, and can promote the crystallization rate of the polyamide material, so that the layered nano filler and the fibrous nano filler can play a role of heterogeneous nucleating agent in the injection molding process, thereby inducing the crystallization of the polyamide material, promoting the crystallization rate of polyamide at a high temperature, thereby enabling the polyamide material to crystallize more rapidly, and the polyamide material can be completely crystallized, remarkably promoting the dimensional stability of the housing 10, and improving the modulus of the housing 10.

According to one embodiment of the invention, the layered nanofiller has a lateral dimension of 1nm to 100nm; and/or the diameter of the fibrous nano filler is 10 nm-500 nm. That is, when the layered nanofiller is used alone, the layered nanofiller has a lateral dimension of 1nm to 100nm; when the fibrous nano filler is adopted as the filler, the diameter of the fibrous nano filler is 10 nm-500 nm; when the filler of the present invention contains both the layered nanofiller and the fibrous nanofiller, at least one of the layered nanofiller and the fibrous nanofiller meets the above-described limitations, i.e., falls within the scope of the present invention.

The dimensions of the layered nanofiller and the fibrous nanofiller are described in detail below.

For the layered nanofiller, the transverse dimension of the layered nanofiller is 1nm to 100nm and the ratio of the transverse dimension to the longitudinal dimension of the layered nanofiller is 50:1 to 200, that is, the longitudinal dimension of the layered nanofiller is 0.005nm to 2nm. It should be noted that if the lateral dimension of the layered nano-filler is smaller than 1nm, the more difficult the material processing becomes as the lateral dimension is reduced, so that it is difficult to process the layered filler with the lateral dimension smaller than 1nm by conventional means; if the transverse dimension of the layered nano filler is more than 100nm, the specific surface area of the filler is reduced, the reinforcing effect is reduced, and the crystallization induction capability is deteriorated; it can be seen that the transverse dimension of the layered nano-filler in this embodiment is 1nm to 100nm, which can satisfy the capability of the processing technique, and the polyamide material has good reinforcing effect and crystallization induction capability, and the dimensional stability of the shell 10 is improved. Alternatively, the layered nanofiller has a lateral dimension of 1nm, 10nm, 20nm, 50nm, 80nm, 100nm, etc.

For the fibrous nano-filler, the diameter of the fibrous nano-filler is 10nm to 500nm on the basis that the ratio of the length to the diameter of the fibrous nano-filler is 50:1 to 200:1. It should be noted that if the diameter of the fibrous nanofiller is smaller than 10nm, the fibrous nanofiller may be difficult to process, and the production cost of the housing 10 may be increased. If the diameter of the fibrous nanofiller is more than 500nm, the specific surface area of the fibrous nanofiller is decreased, the crystallization-inducing ability is decreased, and the dimensional stability of the shell 10 is decreased. It can be seen that the fibrous nanofiller of this embodiment has a diameter of 10nm to 500nm, which can reduce the processing cost and improve the dimensional stability of the shell 10. Alternatively, the fibrous nanofiller has a diameter of 10nm, 100nm, 150nm, 200nm, 250nm, 300nm, 500nm, etc.

In some embodiments of the invention, the layered nanofiller comprises an inorganic nanoflake comprising: at least one of talcum nano-sheet, mica nano-sheet, clay nano-sheet, montmorillonite nano-sheet, vanadium pentoxide nano-sheet, molybdenum disulfide nano-sheet, tungsten disulfide nano-sheet, titanium dioxide nano-sheet and phosphate nano-sheet. Wherein the layered nanofiller may be dispersed into the polyamide material by intercalation. For example, the shell 10 may be prepared by intercalating a polyamide synthetic monomer into a filler, exfoliating the filler into a layered nano-sheet having a nano-effect, and then polymerizing to form a polyamide composite material having the layered nano-sheet uniformly dispersed therein.

According to one embodiment of the invention, the layered nanofiller is present in an amount of 0.5wt% to 10wt% based on the total weight of the feedstock, including the endpoints thereof being 0.5wt% and 10wt%. It should be noted that if the weight percentage of the layered nanofiller is less than 0.5wt%, the addition ratio of the layered nanofiller is small, and the reinforcing effect is limited; if the weight percentage of the layered nanofiller is more than 10wt%, it tends to be difficult to disperse the filler, resulting in easy packing of the filler, thereby affecting the reinforcing efficiency of the polyamide material. It can be seen that when the content of the layered nano-filler is 0.5wt% to 10wt% based on the total amount of the raw materials, not only the reinforcing effect of the layered nano-filler on the case 10 can be achieved, but also the reinforcing efficiency can be improved, and the modulus and the heat distortion temperature of the case 10 can be improved. Alternatively, the weight percent of the layered nanofiller is 0.5wt%, 1wt%, 2.5wt%, 5.5wt%, 8wt%, 10wt%, etc.

In some embodiments of the invention, the fibrous nanofiller comprises: at least one of poly (paraphenylene terephthalamide) (PPTA) nanofibers, poly (paraphenylene isophthalamide) (PMIA) nanofibers, and polyimide nanofibers. The poly-paraphenylene terephthalamide (PPTA), poly-paraphenylene isophthalamide (PMIA) and polyimide material have good compatibility with polyamide material, and have extremely strong reinforcing effect on the polyamide material when forming nano microfibers. In the preparation process, the poly (paraphenylene terephthalamide) (PPTA), the poly (paraphenylene isophthalamide) (PMIA) and the polyimide can be dissolved in the PA monomer, and then the poly (paraphenylene terephthalamide) (PPTA), the poly (paraphenylene isophthalamide), the poly (meta-phenylene isophthalamide) (PMIA) and the polyimide material can form microfibrillation after shearing and stirring and are uniformly dispersed in the polyamide material.

According to one embodiment of the invention, the fibrous nanofiller is present in an amount of 0.1wt% to 2wt% based on the total weight of the feedstock, including the endpoints thereof being 0.1wt% and 2wt%. It should be noted that if the weight percentage of the fibrous nanofiller is less than 0.1wt%, the fibrous nanofiller is added in a small proportion, and the reinforcing effect is limited; if the weight percentage of the fibrous nanofiller is more than 2wt%, it tends to be difficult to disperse the filler, resulting in easy packing of the filler, thereby affecting the reinforcing efficiency of the polyamide material. It can be seen that when the fibrous nano filler is contained in an amount of 0.1wt% to 2wt% based on the total amount of the raw materials, not only the reinforcing effect of the fibrous nano filler on the case 10 can be achieved, but also the reinforcing efficiency can be improved, and the modulus and the heat distortion temperature of the case 10 can be improved. Alternatively, the weight percent of fibrous nanofiller is 0.1wt%, 0.2wt%, 0.5wt%, 1wt%, 1.5wt%, 2wt%, etc.

Since the specific surface areas of the lamellar nanofiller and the fibrous nanofiller are different, the fibrous nanofiller has a higher specific surface area, and therefore the fibrous nanofiller has a smaller upper limit of filler accumulation, whereas the lamellar nanofiller has a larger upper limit of filler accumulation, for example, the fibrous nanofiller is present in an amount of 0.1 to 2wt% based on the total amount of the raw material, and the lamellar nanofiller is present in an amount of 0.5 to 10wt% based on the total amount of the raw material.

In some embodiments of the invention, the polyamide binder comprises: at least one of PPA, PA6T, PA, T, PA, T, PA, PA66, PA6, PA68, PA610, PA612, PA9, PA1010, PA1012, PA11, PA12, PA1212, PA 1313. It can be seen that Polyamide (PA) has a wide variety of characteristics, and is commonly known as nylon, which is a thermoplastic resin with a molecular main chain containing repeated amide groups. The use of the materials listed above as polyamide binders has the advantage of good compatibility with the lamellar nanofiller and the fibrous nanofiller.

According to one embodiment of the invention, the filler further comprises a cenosphere filler, the cenosphere filler comprising inorganic cenospheres and/or organic cenospheres, wherein the inorganic cenospheres comprise glass cenospheres and/or ceramic cenospheres, and the organic cenospheres comprise phenolic cenospheres and/or polystyrene cenospheres.

Specifically, the center of the hollow microsphere is of a cavity structure, so that the hollow microsphere has the characteristics of low density and high compressive strength. When the modified polyamide material is obtained after the hollow microsphere, the polyamide material and the like are compounded, the hollow microsphere can obviously reduce the density of the modified polyamide material, and can enhance the rigidity, strength and other properties of the modified polyamide material, thereby reducing the weight of the shell 10 and improving the strength of the shell 10.

When the organic hollow bead adopts the phenolic hollow bead, the phenolic hollow bead can be processed by phenolic resin, the phenolic resin has the characteristic of heat preservation, and the phenolic hollow bead prepared by the phenolic resin also has excellent heat insulation effect. In addition, the phenolic aldehyde hollow microsphere can also play a role in reducing the density of the shell 10 and reducing the weight of the shell 10.

When the organic hollow microsphere adopts polystyrene hollow microsphere, the polystyrene hollow microsphere is dispersed in the polyamide material, so that various stresses can be dispersed, and the mechanical property of the polyamide material is improved. The housing 10 obtained by the preparation of the polystyrene hollow beads or the like can not only reduce the weight of the housing 10 by reducing the density, but also enhance the mechanical properties of the housing 10, such as improving the impact resistance of the housing 10.

When the hollow microsphere adopts the inorganic hollow microsphere, the shell of the inorganic hollow microsphere adopts an inorganic material, the center is of a cavity structure, the density of the inorganic hollow microsphere is generally 0.1g/cm ³～0.8g/cm³, and the inorganic hollow microsphere has the characteristics of small density and high compressive strength. When the modified polyamide material is obtained after the inorganic hollow microspheres and the polyamide resin are compounded, the inorganic hollow microspheres can obviously reduce the density of the modified polyamide material, enhance the strength of the modified polyamide material, further reduce the weight of the shell 10 and improve the strength of the shell 10.

When the inorganic hollow micro beads adopt hollow glass micro beads, the hollow glass micro beads are of a hollow structure, and contain tiny spherical powder of inert gas, and belong to non-metal inorganic materials. The hollow glass beads (ES) are tiny spherical particles with thin walls and closed and are manufactured by a special process, and the diameter of the particles is between a few micrometers and a few millimeters, so that the hollow glass beads have many excellent characteristics of strong shock resistance, good rolling property, low heat conductivity, heat insulation, high electric insulation strength and the like, not only can reduce the density of the shell 10, but also can improve the strength and shock resistance of the shell 10.

The inorganic hollow microsphere adopts ceramic hollow microsphere, the surface of the ceramic hollow microsphere is a sealed ceramic shell 10, and the interior of the ceramic hollow microsphere is sealed with a large amount of tiny particles such as air, so that the ceramic hollow microsphere has the characteristics of small density and low heat conductivity, and can reduce the density of the shell 10.

In addition, it should be noted that, compared with the inorganic hollow microsphere, the organic hollow microsphere has high compressive strength, is not easy to break in the use process, has better stability, has lower density than the inorganic hollow microsphere, and can play a good weight reduction effect on the shell 10. Compared with the organic hollow microsphere, the inorganic hollow microsphere has higher temperature resistance than the organic hollow microsphere, and the breakage rate of the inorganic hollow microsphere is lower than that of the organic hollow microsphere under a high-temperature environment. In the present invention, for polyamide materials, a higher proportion of inorganic cenospheres may be selected at higher processing temperatures. When the processing temperature is slightly low, inorganic hollow microspheres and organic hollow microspheres with other proportions can be selected, and the method is not limited in particular according to the process design.

Alternatively, when hollow glass beads are used as the inorganic hollow beads, the hollow glass beads have a density of 0.45g/cm ³～0.75g/cm³ and include end points of 0.45g/cm ³ and 0.75g/cm ³. It should be noted that if the density of the hollow glass beads is less than 0.45g/cm ³, the particle size of the hollow glass beads is large, or even more than 50 μm based on the same weight of the hollow glass beads. Due to the increase of the particle size, the hollow glass beads are poor in pressure and shearing resistance, so that the hollow glass beads are easy to damage in an injection molding process, the effect of reducing the density of the shell 10 cannot be achieved, and the purpose of lightening the shell 10 is difficult to achieve. If the density of the hollow glass microspheres is greater than 0.75g/cm ³, the weight reduction effect on the housing 10 is limited. Therefore, the density of the hollow glass beads is 0.45g/cm ³～0.75g/cm³, the self breakage rate can be reduced, and the weight reduction effect on the shell 10 is ensured. Alternatively, the hollow glass microspheres have a density of 0.45g/cm ³、0.50g/cm³、0.60g/cm³、0.70g/cm³ or 0.75g/cm ³, etc.

According to one embodiment of the invention, the content of the hollow microsphere filler is 5-40 wt% of the total weight of the raw material, including the end point values of 5-40 wt%. It should be noted that, if the hollow microsphere filler is used as the low-density filler, the effect of reducing the density of the shell 10 is limited if the weight percentage of the hollow microsphere filler is less than 5wt%, and if the weight percentage of the hollow microsphere filler is more than 40wt%, the impact resistance of the shell 10 is reduced, resulting in failure of the drop reliability of the shell 10. Therefore, the hollow microsphere filler in the embodiment has the weight percentage of 5-40 wt%, so that the weight reduction effect on the shell 10 can be achieved, and the impact resistance of the shell 10 can be improved. Optionally, the content of the hollow microsphere filler is 5wt%, 15wt%, 20wt%, 25wt%, 30wt%, 40wt% and the like based on the total weight of the raw materials.

In some embodiments of the present invention, the flexural modulus of the housing 10 is not less than 3.5GPa, i.e., the flexural modulus of the housing 10 is not less than 3.5GPa, which is beneficial to ensure the mechanical properties of the housing 10. The testing principle of the flexural modulus of the shell 10 is referred to GB/T9341-2008, and the specific testing method is that a flat part with uniform thickness on the shell 10 is taken as a sample, and the width 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; test speed: 2mm/min; 5 bars were tested and averaged.

If the flexural modulus of the case 10 is less than 3.5GPa, the strength of the case 10 may be insufficient, and the sound generating apparatus 100 assembled by the case 10 may be prone to resonance. Therefore, by making the flexural modulus of the case 10 not less than 3.5GPa, it is advantageous to improve the acoustic performance and mechanical properties of the sound generating apparatus 100. Alternatively, the flexural modulus of the housing 10 is 3.5GPa, 4GPa, 5GPa, 6GPa, 7GPa, 8GPa, 10GPa, or the like, whereby the structural strength of the housing 10 can be made to satisfy the use requirements of the sound generating apparatus 100.

According to one embodiment of the present invention, the heat distortion temperature of the housing 10 is not less than 145 ℃. That is, the heat distortion temperature of the case 10 is not less than 140 ℃ under the bending stress of 1.8MPa, and the heat resistance of the case 10 can be improved. It should be noted that if the heat distortion temperature is less than 140 ℃, the heat resistance of the housing 10 will be poor, and the housing 10 will be easily deformed in a high temperature environment. 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.

In some embodiments of the present invention, the housing 10 includes a first sub-housing and a second sub-housing, the first sub-housing is adhered to or integrally injection molded with the second sub-housing, the first sub-housing is made of a modified polyamide material, and the second sub-housing is made of at least one of steel, an aluminum alloy, a copper alloy, a 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, the housing 10 of the sound generating apparatus 100 according to the embodiment of the present invention may be assembled by the first sub-housing and the 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 modified polyamide materials, 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 shown in fig. 1, the present invention further provides a sound generating device 100, including the housing 10 of the sound generating device 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 shell 10 of the sound generating device 100 is made of modified polyamide materials, so that not only can the acoustic performance of the sound generating device 100 be met, but also the design requirements of the light and thin sound generating device 100, high-temperature stability and mechanical properties can be met, and the applicability of the sound generating device 100 in various electronic equipment 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 an 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, the speaker unit is first fixed to the upper case 11 or the lower case 12, and then the upper case 11 and the lower case 12 are welded as 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 case 11, the middle case, and the lower case 12 is made of a modified polyamide material, i.e., all of at least one of the upper case 11, the middle case, and the lower case 12 is made of a modified polyamide material, or a portion of at least one of the upper case 11, the middle case, and the lower case 12 is made of a modified polyamide material.

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 device 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 the advantages of high modulus, superior dimensional stability, etc., so that the requirements of the speaker sound generating module can be satisfied, and the modulus of the sound generating device 100 and the electronic device product is also higher.

A method for manufacturing the housing 10 of the sound generating apparatus 100 according to an embodiment of the present invention will be described in detail.

Method one

Adding the polyamide base material into a main feed of a double-screw extruder, adding the layered nano filler and/or the fibrous nano filler into a side feed after the polyamide base material is melted, shearing and uniformly mixing in the extruder, and extruding and granulating to obtain the modified polyamide material.

After the shell is formed by the modified polyamide material through an injection molding process, the prepared shell and a loudspeaker monomer are assembled into the loudspeaker sounding module.

Method II

In the polyamide synthesis process, lamellar filler, poly (paraphenylene terephthalamide) (PPTA), poly (paraphenylene terephthalamide), poly (meta-phenylene isophthalamide) (PMIA) and polyimide are added into a polymerization device, and micromolecule substances of synthetic raw materials of polyamide are diffused into the lamellar filler, the poly (paraphenylene terephthalamide) (PPTA), the poly (meta-phenylene terephthalamide), the poly (meta-phenylene isophthalamide) (PMIA) and the polyimide and simultaneously undergo polymerization reaction, and the stirring and shearing actions of equipment are accompanied, so that the lamellar nano filler and fibrous nano filler reinforced modified polyamide material is formed.

And then, after the shell 10 is molded by the modified polyamide material through an injection molding process, the prepared shell 10 and a loudspeaker monomer are assembled into a loudspeaker sounding module.

The housing 10 of the sound emitting device 100 and the sound emitting device 100 according to the embodiment of the present invention will be described in detail with reference to specific embodiments.

Comparative example 1

The traditional shell is formed by injection molding of 80wt% of PC material and 20wt% of glass fiber, and the obtained shell is assembled with a loudspeaker monomer to obtain the loudspeaker sounding module.

Comparative example 2

And forming a traditional shell by adopting 80 weight percent of PA66 material and 20 weight percent of glass fiber through injection molding, and assembling the obtained shell with a loudspeaker monomer to obtain the loudspeaker sounding module.

Comparative example 3

And forming a traditional shell by adopting 80wt% of PPA material and 20wt% of glass fiber through injection molding, and assembling the obtained shell with a loudspeaker monomer to obtain the loudspeaker sounding module.

Comparative example 4

And forming a traditional shell by adopting 80 weight percent of PA6 material and 20 weight percent of glass fiber through injection molding, and assembling the obtained shell with a loudspeaker monomer to obtain the loudspeaker sounding module.

Comparative example 5

And forming a traditional shell by adopting 80 weight percent of PA12 material and 20 weight percent of glass fiber through injection molding, and assembling the obtained shell with a loudspeaker monomer to obtain the loudspeaker sounding module.

Comparative example 6

And forming a traditional shell by adopting 80 weight percent of PA610 material and 20 weight percent of glass fiber through injection molding, and assembling the obtained shell with a loudspeaker monomer to obtain the loudspeaker sounding module.

Example 1

Adding 95wt% of PA66 matrix resin into a main feed of a double-screw extruder, adding 5wt% of montmorillonite nano-sheets (namely lamellar nano-filler) into the side feed after the PA66 matrix resin is melted, shearing and mixing uniformly in the extruder, and extruding and granulating to obtain the modified polyamide material.

After the shell 10 is molded by the modified polyamide material through an injection molding process, the prepared shell 10 and a speaker monomer are assembled into a speaker sounding module.

Example 2

Adding 97wt% of PPA matrix resin into a main feed of a double-screw extruder, adding 3wt% of mica nano-sheets (namely lamellar nano-filler) into a side feed after PPA matrix resin is melted, shearing and mixing uniformly in the extruder, and extruding and granulating to obtain the modified polyamide material.

Example 3

Adding 99.5wt% of PA6 matrix resin into a main feed of a double-screw extruder, adding 0.5wt% of poly-p-phenylene terephthalamide nano-microfiber (i.e. fibrous nano-filler) into the side feed after the PA6 matrix resin is melted, shearing and mixing uniformly in the extruder, extruding and granulating to obtain the modified polyamide material.

Example 4

Adding 99wt% of PA12 matrix resin into a main feed of a double-screw extruder, adding 1wt% of poly (paraphthaloyl metaphenylene diamine) nano microfiber (i.e. fibrous nano filler) into the side feed after the PA12 matrix resin is melted, shearing and mixing uniformly in the extruder, extruding and granulating to obtain the modified polyamide material.

Example 5

Adding 98.5wt% of PA610 matrix resin into a main feed of a double-screw extruder, adding 1.5wt% of polyimide nanometer microfiber (namely fibrous nanometer filler) into a side feed after the PA610 matrix resin is melted, shearing and mixing uniformly in the extruder, extruding and granulating to obtain the modified polyamide material.

Example 6

Adding 83wt% of PA66 matrix resin into a main feed of a double-screw extruder, adding 7wt% of montmorillonite nano-sheets (namely lamellar nano-filler) into the side feed after the PA66 matrix resin is melted, adding 10wt% of hollow glass micro-beads into the side feed, shearing and mixing uniformly in the extruder, extruding and granulating to obtain the modified polyamide material.

Example 7

Adding 59 weight percent of PA6 matrix resin into a main feed of a double-screw extruder, adding 1 weight percent of poly (paraphenylene terephthalamide) nano-microfiber (i.e. fibrous nano filler) into the side feed after the PA6 matrix resin is melted, adding 40 weight percent of hollow glass microspheres into the side feed, shearing and uniformly mixing in the extruder, extruding and granulating to obtain the modified polyamide material.

For ease of comparison, the ratios of the raw materials of comparative examples 1 to 6 and examples 1 to 7 are shown in table 1 below.

Table 1 comparative table of the formulation

The housings of comparative examples 1 to 6, the cases 10 of examples 1 to 7, and the different speaker sound emitting modules obtained were tested as follows.

(1) The shells of comparative examples 1 to 6 and the shells 10 of examples 1 to 7 were respectively subjected to the tests of density, flexural modulus, cold crystallization, filler addition ratio, modulus increment, and reinforcing efficiency, and the test results are shown in table 2 below.

Table 2 summary of physical properties

The test criteria for each performance test in table 2 are as follows:

Determination of GB/T1033.1-2008 Plastic non-foam Density part 1: dipping method, liquid specific gravity flask and titration method;

flexural modulus test: GB/T9341-2008 plastic bending property determination

The method for testing whether cold crystallization exists comprises the following steps: GB/T19466.3-2004 Plastic Differential Scanning Calorimetry (DSC) part 3: measuring melting and crystallization temperatures and enthalpy; testing the module housing 10 to see whether a cold crystallization peak appears in the first heating process;

Filler addition ratio: weight percent of reinforcing agent added in each example in table 1;

Modulus increase: the difference between the modulus of the material after addition of the reinforcing agent and the modulus of the neat material;

Reinforcing efficiency: modulus increase/filler mass fraction.

As shown in table 1, in the cold crystallization test, since the PC material of comparative example 1 was an amorphous material, the test result of comparative example 1 was free from cold crystallization. The test results of comparative examples 2 to 6 all had cold crystallization, since the melt of comparative examples 2 to 6 cooled too rapidly during the injection molding of the shell, resulting in imperfect crystallization of the matrix resin, and when the temperature was raised again, recrystallization occurred at a lower temperature, because cold crystallization occurred.

The test results of examples 1 to 7 were all free of cold crystallization, since the reinforcing agent was filled in the matrix resin in examples 1 to 7, and the reinforcing agents of examples 1,2 and 6 were layered nanofillers, and the reinforcing agents of examples 3, 4,5 and 7 were fibrous nanofillers. The lamellar nano filler and the fibrous nano filler are beneficial to improving the crystallization efficiency of matrix resin, so that the matrix resin can be completely crystallized in the injection molding process, and further, no cold crystallization phenomenon exists in the test result.

(2) The housings of comparative examples 1 to 6 and the different speaker sound emitting modules of examples 1 to 7 were subjected to reliability verification tests, and the test results are shown in table 3 below.

Table 3 reliability results comparison table

The reliability test conditions in table 3 are as follows:

High temperature and high humidity reliability test: the loudspeaker sounding module is placed in an environment with 85 ℃ and 85% humidity, and is operated for 72 hours at rated voltage of 1.2 times, and the dimensional variation of the shell of the loudspeaker sounding module is tested; determination criteria: the size variation of the loudspeaker sounding module shell exceeds 5s (s is a wire and 10um is 1 s), namely, the judgment is NG, and the size variation of the loudspeaker sounding module shell is less than 5s, and the judgment is OK;

High power reliability: the sounding module of the loudspeaker is placed at normal temperature and operates for 96 hours with 1.2 times of rated power; determination criteria: the size variation of the shell of the sounding module of the loudspeaker is less than 5s, the OK is judged when no obvious noise exists in the sounding, the size variation is more than 5s, or the NG is judged when the noise exists in the sounding;

high low temperature cycle reliability: placing the loudspeaker sounding module in an environment of-30 ℃ for 2 hours, then transferring to the environment of 80 ℃ for 2 hours, and circulating for 30 times, wherein the size of the shell of the loudspeaker sounding module changes; determination criteria: the size change of the speaker sounding module housing exceeds 5s (s is a wire, 10um is 1 s), namely, the speaker sounding module housing is judged to be NG, and the size change of the speaker sounding module housing is less than 5s, and is judged to be OK.

As shown in table 2, when the high temperature and high humidity reliability deformation test was performed, the test result of comparative example 1 was OK, and the test results of comparative examples 2 to 6 were NG. This is because the crystallization generated in comparative examples 2 to 6 causes shrinkage of the material, and thus, in the high temperature and high humidity reliability deformation test process, the cold crystallization peaks in comparative examples 2 to 6 cause the corresponding housings to be easily deformed, so that the size of the housing product is too large, and the use of the speaker sounding module is affected.

As seen from table 3, in the speaker sound emitting module of comparative example 1, in the high-power reliability verification, since the temperature of the speaker sound emitting module increases as the verification proceeds, the housing has deformed, resulting in an excessive change in the housing size, causing the speaker sound emitting module to listen to noise, and thus the verification fails.

In the high-temperature high-humidity reliability deformation verification of the loudspeaker sounding modules in the comparative examples 2 to 6, the shells of the comparative examples 2 to 6 are imperfect in crystallization after injection molding is finished, and cold crystallization appearance of the shells occurs along with the rise of temperature in the high-temperature high-humidity reliability verification; since crystallization can cause shrinkage of material dimensions, cold crystallization can cause excessive shell dimensional changes, thereby causing the speaker sounding module to experience listening noise failure.

As can be seen from a combination of tables 1,2 and 3, the reinforcing agents in examples 1,2 and 6 use lamellar nanofillers, and the reinforcing agents in examples 3, 4, 5 and 7 use fibrous nanofillers. The flexural modulus of the shell 10 in example 1 is 5.3GPa, the flexural modulus of the shell 10 in example 2 is 5.5GPa, the flexural modulus of the shell 10 in example 3 is 5.4GPa, the flexural modulus of the shell 10 in example 4 is 5.7GPa, the flexural modulus of the shell 10 in example 5 is 6.3GPa, and the cold crystallization phenomenon is not generated in any of examples 1 to 5, it is apparent that the lamellar nanofiller or fibrous nanofiller is added into the shell 10 in examples 1 to 5, and the flexural modulus of the shell 10 is improved, and at the same time, the crystallization effect of the matrix resin is improved, so that the crystallization efficiency of the matrix resin is improved, the dimensional stability of the shell 10 is higher, the stability is better in the reliability verification process, and the requirements of the speaker sounding module can be satisfied.

For examples 6 and 7, montmorillonite nano-platelets were added in example 6 at a rate of 7wt%; the poly (paraphenylene terephthalamide) nanofibers were added in example 7 at a ratio of 1%. It can be seen that, for examples 6 and 7, lamellar nanofillers or fibrous nanofillers having high reinforcing efficiency were added to the shell 10 in a small proportion, so that the density of the shell 10 was relatively low. In addition, hollow glass beads are added in the embodiment 6 and the embodiment 7 respectively, the density of the shell 10 can be lower, specifically, the density of the shell 10 in the embodiment 6 is 0.99g/cm ³, and the density of the shell 10 in the embodiment 7 is 0.79g/cm ³, so that the light-weight requirement of the loudspeaker sounding module can be better met by adding the hollow glass beads.

Further, as shown in table 1, the reinforcing efficiencies of the respective comparative examples and the respective examples were compared, and it was found that, among comparative examples 1 to 6, the maximum reinforcing efficiency was 17, but the reinforcing efficiency was still less than 20. Whereas, of examples 1 to 7, example 1 had the smallest reinforcing efficiency and the smallest reinforcing efficiency was 47, which indicates that the reinforcing efficiency of the layered nanofiller and the fibrous nanofiller was much higher than that of the glass fiber.

In addition, in examples 1 to 7, the content of montmorillonite nano-sheets in example 6 was the largest, specifically 7wt%, which suggests that the nano-sheets and nano-microfibers of low loading amount can achieve the effects of high modulus and high reinforcing efficiency.

By comparing example 6 with example 7, a high modulus can be achieved by adding less reinforcing filler, so that the density is lower than that of the glass fiber reinforced materials in comparative examples 1 to 6, and the density is smaller after the hollow glass beads with low density are added in examples 6 and 7, thereby achieving the aim of light weight.

In summary, at least a part of the housing of the sound emitting device according to an embodiment of the present invention is modified by dispersing layered nanofillers and/or fibrous nanofillers in a polyamide material. Because the lamellar nanofiller and the fibrous nanofiller have stronger reinforcing effect, the modulus and the heat distortion temperature of the polyamide material can be obviously improved by adding a smaller amount of lamellar nanofiller and/or fibrous nanofiller. In addition, the layered nano-filler and the fibrous nano-filler also have the effect of inducing crystallization, and can obviously improve the crystallization rate of the polyamide material, so that the polyamide material can be completely crystallized in the injection molding process, and the dimensional stability of the shell 10 of the loudspeaker sounding module is obviously improved. In addition, when the polyamide material is filled with the low-density filler (for example, hollow beads), the density of the polyamide material can be reduced, thereby reducing the density of the housing 10 and realizing the light-weight density of the housing 10. Moreover, the impact resistance of the shell 10 can be improved by filling the hollow microspheres, so that the problem of falling reliability failure is avoided.

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. A housing of a sound emitting device, wherein at least a portion of the housing is made of a modified polyamide material, a raw material of the modified polyamide material including a polyamide base material and a filler dispersed in the polyamide base material, the filler including at least one of a layered nanofiller and a fibrous nanofiller;

wherein the layered nanofiller has a lateral dimension extending in a first plane and a longitudinal dimension extending in a second plane, the ratio of the lateral dimension to the longitudinal dimension of the layered nanofiller being 50:1 to 200:1;

and/or the ratio of the length to the diameter of the fibrous nano filler is 50:1-200:1;

the transverse dimension of the layered nano filler is 1 nm-100 nm;

and/or the diameter of the fibrous nano filler is 10 nm-500 nm.

2. The sound emitting device housing of claim 1, wherein the layered nanofiller comprises an inorganic nanoflake comprising: at least one of talcum nano-sheet, mica nano-sheet, clay nano-sheet, montmorillonite nano-sheet, vanadium pentoxide nano-sheet, molybdenum disulfide nano-sheet, tungsten disulfide nano-sheet, titanium dioxide nano-sheet and phosphate nano-sheet.

3. The sound emitting device housing of claim 2, wherein the layered nanofiller is present in an amount of 0.5wt% to 10wt% based on the total amount of the raw materials.

4. The sound emitting device housing of claim 1, wherein the fibrous nanofiller comprises: at least one of poly (paraphenylene terephthalamide) nanofibers, poly (paraphenylene isophthalamide) nanofibers, and polyimide nanofibers.

5. The sound emitting device housing of claim 4, wherein the fibrous nanofiller is present in an amount of 0.1wt% to 2wt% based on the total amount of the raw materials.

6. The sound emitting device housing of claim 1, wherein the polyamide base material comprises: at least one of PPA, PA6T, PA, T, PA, T, PA, PA66, PA6, PA68, PA610, PA612, PA9, PA1010, PA1012, PA11, PA12, PA1212, PA 1313.

7. The sound emitting device housing of claim 1, wherein the filler further comprises:

The hollow microsphere filler comprises inorganic hollow microspheres and/or organic hollow microspheres, wherein the inorganic hollow microspheres comprise glass hollow microspheres and/or ceramic hollow microspheres, and the organic hollow microspheres comprise phenolic hollow microspheres and/or polystyrene hollow microspheres.

8. The sound emitting device housing of claim 7, wherein the cenosphere filler is present in an amount of 5 to 40 weight percent based on the total amount of the raw materials.

9. The housing of a sound emitting device according to claim 1, wherein the flexural modulus of the housing is not less than 3.5GPa.

10. The housing of a sound emitting device according to claim 1, wherein a heat distortion temperature of the housing is not less than 145 ℃.

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 made of the modified polyamide material, 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.