CN115746497B - Shell of sound generating device, sound generating device with shell and electronic equipment - Google Patents
Shell of sound generating device, sound generating device with shell and electronic equipment Download PDFInfo
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- CN115746497B CN115746497B CN202211263188.XA CN202211263188A CN115746497B CN 115746497 B CN115746497 B CN 115746497B CN 202211263188 A CN202211263188 A CN 202211263188A CN 115746497 B CN115746497 B CN 115746497B
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Abstract
The invention discloses a shell of a sound generating device, the sound generating device and electronic equipment with the same, wherein the shell of the sound generating device comprises a shell part, the shell part is at least made of phenolic molding plastic, the phenolic molding plastic contains phenolic resin and reinforcing materials, the phenolic resin accounts for 20-65% of the total weight of the phenolic molding plastic, the reinforcing materials account for 35-80% of the total weight of the phenolic molding plastic, and the flexural modulus of the shell part is more than 7GPa. According to the shell of the sound production device, at least one part of the shell is made of the shell part containing phenolic molding compound, the phenolic molding compound contains phenolic resin and reinforcing materials, and the content of the reinforcing materials is high, so that the strength and the bending modulus of the phenolic molding compound can reach a high level, the strength of the manufactured shell is high, the thickness of the corresponding area of the shell and the front cavity and the rear cavity can be reduced on the basis of ensuring the rigidity of a product, and the weight of the product is reduced while the problem of insert injection molding is solved.
Description
Technical Field
The present invention relates to the technical field of electronic devices, and more particularly, to a housing of a sound generating apparatus, a sound generating apparatus having the housing of the sound generating apparatus, and an electronic device having the sound generating apparatus.
Background
Existing speaker housings are typically injection molded from thermoplastic engineering plastics, or from high strength alloys, or from a combination of injection molded housings and steel sheets. However, there are a number of drawbacks to either injection molded housings or housings made from alloys.
Wherein for an injection molded housing:
The injection molded shell is limited by the influence of injection molding parameters, and the viscosity cannot be too high, so that the rigidity of the shell is insufficient, and when the loudspeaker is used, resonance is easily caused in a high-frequency state, and the sounding performance is influenced; the thickness of the front cavity area and the rear cavity area of the injection molded shell is difficult to thin, the size design of the front cavity and the rear cavity is influenced, the high-low frequency performance and F0 of the loudspeaker are further influenced, and even if the shell can be designed to reach a certain thickness, the rigidity is poor, so that the high-frequency resonance frequency of the loudspeaker is low, and the high-frequency performance is influenced; meanwhile, the injection molded shell is heavy, which is contrary to the light design concept, and the shell has poor temperature resistance, so that the use requirement of the product is difficult to meet.
For a shell prepared from alloy, the rigidity of the metal shell can meet the product requirement, but the stamping forming yield of the metal shell is low, and for a product with a complex structure, the metal shell is difficult to form, so that the preparation cost is increased; and the metal shell has heavier mass, which is not beneficial to the lightweight design of the product.
For the shell combined by the injection molding shell and the steel sheet, although the acoustic cavity space of the shell can be saved to a certain extent to achieve better acoustic performance, the structure is formed by adopting a pre-insert or post-bonding mode, the requirement on forming precision is higher, the forming process is complex, and the preparation cost is increased.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a housing of a sound generating device, which has high rigidity, small thickness, light weight and convenient molding.
Another object of the present invention is to provide a sound emitting device having the housing of the sound emitting device described above.
Still another object of the present invention is to provide an electronic apparatus having the above sound emitting device.
According to the shell of the sound generating device, the shell comprises a shell part, the shell part is at least made of phenolic molding plastic, phenolic resin and reinforcing materials are contained in the phenolic molding plastic, the phenolic resin accounts for 20-65% of the total weight of the phenolic molding plastic, the reinforcing materials account for 35-80% of the total weight of the phenolic molding plastic, and the bending modulus of the shell part is larger than 7GPa.
According to some embodiments of the invention, the reinforcing material is at least one of wood flour, talc, glass fiber, carbon fiber, and aramid fiber.
According to some embodiments of the invention, the reinforcing material is at least one of alkali-free glass fibers and high strength glass fibers.
According to some embodiments of the invention, the reinforcing material has a fiber length of 0.3mm to 15mm.
According to some embodiments of the invention, the housing part further comprises: the surface treatment agent is used for carrying out surface treatment on the reinforcing material, and is at least one of silane coupling agent, titanate coupling agent, organic chromium complex and zirconium compound.
According to some embodiments of the invention, the phenolic resin is formed by crosslinking at least one of a phenolic novolac resin and a phenolic resole resin.
According to some embodiments of the invention, the phenolic resin is formed by crosslinking the phenolic novolac resin with a crosslinking agent, wherein the phenolic novolac resin is synthesized by catalytic synthesis after adding a catalyst to a phenolic monomer and an aldehyde monomer, and the molar ratio of phenolic hydroxyl groups in the phenolic monomer to aldehyde groups in the aldehyde monomer is 1:0.7 to 1:0.95.
According to some embodiments of the invention, the catalyst is an acidic catalyst, and the ratio of the catalyst to the added amount of the phenolic monomer is 0.5% to 1.5%; and/or the cross-linking agent is hexamethylenetetramine, and the mass ratio of the cross-linking agent to the phenolic novolac resin is 2% -15%.
According to some embodiments of the invention, the phenolic resin is formed by heat crosslinking of the resole, wherein the resole is synthesized by catalytic synthesis after adding a catalyst to a phenolic monomer and an aldehyde monomer, and the molar ratio of phenolic hydroxyl groups in the phenolic monomer to aldehyde groups in the aldehyde monomer is 1:1 to 1:1.5.
According to some embodiments of the invention, the catalyst is a basic catalyst, and the ratio of the catalyst to the phenolic monomer is 0.3% to 1.7%.
According to some embodiments of the invention, the housing part further comprises: the external toughening agent is at least one of rubber, thermoplastic resin polyamide, PBT, polyurethane and polyphenyl ether, and accounts for 5-15% of the total weight of the shell part in percentage by mass.
According to some embodiments of the invention, the housing part further comprises: the internal toughening agent reacts with phenolic hydroxyl groups of the phenolic resin to form a flexible chain, and the internal toughening agent is at least one of polyvinyl alcohol, polyvinyl acetal, polyamide, epoxy resin, cashew nut shell oil, maleimide, tung oil and polysulfone.
According to some embodiments of the invention, the housing is entirely made up of the shell portion.
According to some embodiments of the invention, the bending strength of the shell part is greater than 90MPa; and/or the notch impact strength of the shell part is greater than 3kJ/m 2; and/or the density of the shell part is less than 2.1g/cm 3.
According to some embodiments of the invention, the housing is integrally injection molded or transfer molded.
A sound emitting device according to an embodiment of the second aspect of the present invention includes a housing of the sound emitting device according to the above-described embodiment.
An electronic device according to an embodiment of the third aspect of the present invention includes the sound emitting apparatus according to the above embodiment.
According to the shell of the sound production device, at least one part of the shell is made of the shell part containing phenolic molding compound, the phenolic molding compound contains phenolic resin and reinforcing materials, and the content of the reinforcing materials is high, so that the strength and the bending modulus of the phenolic molding compound can reach a high level, the strength of the manufactured shell is high, the thickness of the corresponding area of the shell and the front cavity and the rear cavity can be reduced on the basis of ensuring the rigidity of a product, and the weight of the product is reduced while the problem of insert injection molding is solved.
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 graph comparing high frequency resonance curves of a sound emitting device provided according to an embodiment of the present invention with those of a sound emitting device provided according to a comparative example;
Fig. 3 is a graph showing a comparison of frequency response curves of a sound generating device according to an embodiment of the present invention and a sound generating device according to a comparative example.
Reference numerals:
a sound generating device 100;
a housing 10; a front cavity housing 11; a front acoustic cavity 111; a rear cavity housing 12; a rear acoustic cavity 121;
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.
As shown in fig. 1, the housing 10 of the sound generating device 100 according to the embodiment of the present invention includes a housing part made of at least a phenolic molding compound, wherein the phenolic molding compound contains a phenolic resin and a reinforcing material, the phenolic resin accounts for 20% -65% by mass of the total weight of the phenolic molding compound, the reinforcing material accounts for 35% -80% by mass of the total weight of the phenolic molding compound, and the flexural modulus of the housing part is greater than 7GPa.
In other words, at least a part of the housing 10 of the sound generating device 100 according to the embodiment of the present invention is formed of a housing part, wherein the housing part is made of at least a phenolic molding compound, the phenolic molding compound is mainly composed of two parts of phenolic resin and reinforcing material, and the mass content of the reinforcing material in the phenolic molding compound is relatively high, specifically, the mass percentage of the phenolic resin in the phenolic molding compound is between 20% and 65%, and the mass percentage of the reinforcing material is between 35% and 80%, whereby the flexural modulus of the manufactured housing part is greater than 7GPa. The flexural modulus of the housing portion is sufficient to prevent the housing 10 of the sound generating device 100 from resonating during use, thereby allowing the high frequency cut-off frequency FH to shift rearward and expanding the high frequency of the sound generating device 100. Alternatively, the phenolic resin in the phenolic molding compound may be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, etc. Alternatively, the mass percent of reinforcing material in the phenolic molding compound may be 35%, 40%, 50%, 60%, 70%, 80%, 85%, etc.
It should be noted that although the sum of the percentages by mass of the phenolic resin and the reinforcing material in the phenolic molding material is 100%, in the process of preparing the phenolic molding material, there are small amounts of other additives or treating agents in the phenolic resin and the reinforcing material, and since the additives or treating agents are contained in a small amount and in the process of preparing the phenolic molding material, the additives or treating agents are dispersed in the phenolic molding material after reacting, and it is difficult to calculate the percentages by mass, the mass content of the additives or treating agents is omitted in this embodiment, but the phenolic molding material in this embodiment is not represented to be composed of only two parts of the phenolic resin and the reinforcing material.
Thus, according to the housing 10 of the sound generating device 100 of the embodiment of the present invention, at least a part of the housing 10 is made of the housing part containing the phenolic molding compound, the phenolic molding compound contains the phenolic resin and the reinforcing material, and the content of the reinforcing material is high, so that the strength and the flexural modulus of the phenolic molding compound can reach a high level, the strength of the manufactured housing 10 is high, the thickness of the corresponding area of the housing 10 and the front and rear cavities can be reduced on the basis of ensuring the rigidity of the product, and the weight of the product is reduced while the problem of insert injection molding is solved.
According to one embodiment of the invention, the reinforcing material is at least one of wood flour, talc, glass fibers, carbon fibers and aramid fibers. Optionally, the reinforcing material is at least one of alkali-free glass fibers and high strength glass fibers.
That is, the reinforcing material in the housing part according to the embodiment of the present invention may be one or a combination of more of wood flour, talc, glass fiber, carbon fiber and aramid fiber, wherein alkali-free glass fiber (E-glass fiber) or high-strength glass fiber (S-glass fiber) may be preferably used. When the alkali-free glass fiber is adopted as the reinforcing material, the tensile strength is more than 2000MPa, and the modulus is more than 65GPa.
Compared with thermoplastic particles (such as PC, PA and the like) of fiber reinforced materials, when the phenolic resin molding compound of the shell part is prepared, the phenolic resin is not crosslinked, the viscosity is lower, more reinforced materials can be added, and the phenolic resin contains a large amount of hydroxymethyl groups, is easy to be combined with silicon hydroxyl groups on the surface of glass fibers to generate chemical reaction, has better compatibility, and can enable the strength of the prepared shell part to be higher.
In some embodiments of the invention, the reinforcing material has a fiber length of 0.3mm to 15mm.
In other words, in the present invention, the fiber length of the reinforcing material is controlled to be between 0.3mm and 15mm, and may be, for example, 0.3mm,0.8mm,1mm,5mm,10mm,15mm, etc. The longer the fiber length of the reinforcing material, the better the strength and impact resistance of the shell portion, but in a certain range, the bending strength and impact strength of the shell portion will show a rising trend with the increase of the fiber length, and after exceeding a certain range, the fiber length continues to increase, the uniformity thereof will gradually deteriorate, and the molding is difficult.
In the preparation process of the phenolic molding compound, the viscosity and the temperature are low when the phenolic resin and the reinforcing material are blended, so that the reinforcing material consisting of fibers can be ensured to be subjected to small shearing force in the mixing process, the fibers are not easy to damage, and the length and the strength of the fibers are ensured. The conventional thermoplastic PC and PA particle plasmas have larger temperature and viscosity when reinforcing fibers are added, and the fibers are required to bear larger shearing force when being extruded and injection molded by a single screw extruder, so that the reinforcing effect is poor because the fiber length is smaller.
Therefore, in the invention, the strength and the shock resistance of the shell part can be effectively ensured, and the fiber uniformity and the molding difficulty of the shell part can be reasonably controlled by controlling the fiber length of the reinforcing material to be between 0.3mm and 15 mm.
According to some embodiments of the invention, the housing part further comprises: and the surface treating agent is used for carrying out surface treatment on the reinforcing material and is at least one of silane coupling agent, titanate coupling agent, organic chromium complex and zirconium compound.
That is, the case part according to the embodiment of the present invention includes a surface treatment agent that can surface-treat the reinforcing material, in addition to the phenolic molding compound, and the surface treatment agent may be one or a combination of more of a silane-based coupling agent, a titanate coupling agent, an organochromium complex, and a zirconium compound. The surface treating agent is preferably a silane coupling agent, the organic end of the silane coupling agent is combined with phenolic resin in a reaction way, the inorganic end alkoxy on the silane coupling agent is hydrolyzed to generate silanol, the generated silanol and the silicon hydroxyl on the surface of the glass fiber form a chemical bond, the compatibility of the reinforcing material and the resin can be increased, the strength of the shell part is further improved, and finally the effect of further improving the strength and the performance of the shell 10 of the sound generating device 100 is achieved.
In some embodiments of the invention, the phenolic resin is formed by crosslinking at least one of a phenolic novolac resin and a phenolic resole resin.
Specifically, in the invention, the phenolic resin is formed by crosslinking one or two of the phenolic novolac resin and the resol resin, namely the phenolic resin can be formed by crosslinking the phenolic novolac resin alone, can be formed by crosslinking the resol resin, and can be formed by crosslinking the phenolic novolac resin together.
According to one embodiment of the invention, the phenolic resin is formed by crosslinking a linear phenolic resin and a crosslinking agent, wherein the linear phenolic resin is synthesized by adding a catalyst to a phenolic monomer and an aldehyde monomer, and the molar ratio of phenolic hydroxyl groups in the phenolic monomer to aldehyde groups in the aldehyde monomer is 1:0.7 to 1:0.95.
In other words, the phenolic resin according to the embodiment of the invention can be formed by crosslinking the phenolic novolac resin by the crosslinking agent alone, the phenolic novolac resin can be synthesized by the phenolic monomer and the aldehyde monomer under the catalysis of the catalyst, and the molar ratio of phenolic hydroxyl groups in the phenolic monomer to aldehyde groups in the aldehyde monomer is controlled to be 1:0.7 to 1: between 0.95, for example, 1:0.7,1:0.75,1:0.8,1:0.9,1:0.95, etc. The phenolic monomer can be phenol, cresol, xylenol, formaldehyde, acetaldehyde, furfural and the like, or can be a modified monomer.
In this embodiment, the synthetic principle of the phenolic novolac resin is: under an acidic environment, phenolic hydroxyl firstly reacts with formaldehyde to generate monohydroxy methylphenol, and the monohydroxy methylphenol is rapidly dehydrated with o-para-hydrogen of another phenol due to higher activity, so that dihydroxyphenyl methane is formed by connecting methylene bridges, more phenolic hydroxyl is generated by the dihydroxyphenyl methane and formaldehyde, and only linear resin with higher molecular weight can be generated due to excessive hydroxyl.
Controlling the molar ratio of phenolic hydroxyl groups in the phenolic monomers to aldehyde groups in the aldehyde monomers to be 1:0.7 to 1: between 0.95, this ratio ensures the formation of phenolic novolac resin without excessive free phenol present, resulting in improved resin purity and performance. In addition, the linear phenolic resin prepared by the method has a large molecular weight and is solid, and after the cross-linking agent is added, the cross-linking reaction can be continued, so that the linear phenolic resin is easy to store.
In some embodiments of the invention, the catalyst is an acidic catalyst, and the ratio of the catalyst to the phenolic monomer is 0.5% to 1.5%; and/or the cross-linking agent is hexamethylenetetramine, and the mass ratio of the cross-linking agent to the linear phenolic resin is 2-15%.
That is, in the case where the phenolic resin is formed by crosslinking a phenolic novolac resin with a crosslinking agent, the phenolic novolac resin may be synthesized catalytically after adding an acidic catalyst from a phenolic monomer and an aldehyde monomer, the catalyst may preferably be an acidic catalyst such as oxalic acid, hydrochloric acid, sulfuric acid, etc., and the ratio of the catalyst to the phenolic monomer may be controlled to be between 0.5% and 1.5%, for example, 0.5%,0.8%,1%,1.2%,1.5%, etc. The crosslinking agent for crosslinking the novolac resin may be hexamethylenetetramine, and the crosslinking agent may be controlled to be 2% to 15% by mass of the novolac resin, for example, 2%,5%,8%,10%,12%,15%, etc.
In other embodiments of the present invention, the phenolic resin is formed by thermal crosslinking of a resole resin, wherein the resole resin is synthesized catalytically from phenolic monomers and aldehyde monomers with the addition of a catalyst, the molar ratio of phenolic hydroxyl groups in the phenolic monomers to aldehyde groups in the aldehyde monomers being 1:1 to 1:1.5.
Optionally, the catalyst is an alkaline catalyst, and the ratio of the catalyst to the phenolic monomer is 0.3-1.7%.
In other words, the phenolic resin according to the embodiment of the invention may be formed by heat crosslinking of a resol, and the resol may be synthesized by a phenolic monomer and an aldehyde monomer under the catalytic action of a catalyst, and the molar ratio of phenolic hydroxyl groups in the phenolic monomer to aldehyde groups in the aldehyde monomer is controlled to be 1:1 to 1:1.5, for example, may be 1:1,1:1.1,1:1.2,1:1.3,1:1.4,1:1.5, etc. Under the condition that the phenolic resin is formed by heating and crosslinking the resol, the resol can be synthesized by phenol monomers and aldehyde monomers under the catalysis of an alkaline catalyst, the alkaline catalyst can be selected from NaOH, NH 3·H2O、Ba(OH)2, mgO and the like, and the mass ratio of the catalyst to the phenol monomers is controlled between 0.3% and 1.7%, for example, can be 0.3%,0.5%,0.8%,1%,1.2%,1.5%,1.7% and the like.
In this example, the principle of the resole is: under alkaline environment, the phenolic hydroxyl and formaldehyde firstly generate the monohydroxyphenol, and the monohydroxyphenol under alkaline environment is stable, so that the monohydroxyphenol can not continue to be polycondensed, and can only further react with formaldehyde to generate the dihydric phenol and the polyhydric methylphenol, the proportion ensures that the methylol phenol at least contains two to three hydroxymethyl groups, and can be directly heated and crosslinked subsequently, and the copolymer performance can be ensured not to be influenced by redundant micromolecular formaldehyde.
The molding compound prepared by the resol resin has no generation of corrosive gas ammonia and the like in the curing and crosslinking process, and can better protect the production environment and mold tools.
According to one embodiment of the invention, the housing part further comprises: the external toughening agent is at least one of rubber, thermoplastic resin polyamide, PBT, polyurethane and polyphenyl ether, and accounts for 5-15% of the total weight of the shell part in percentage by mass.
Specifically, the external toughening agent can be added after the phenolic resin is molded, and fused with the phenolic resin to enhance the strength and flexibility of the phenolic molding compound. The addition of the external toughening agent is too low to achieve the toughening effect, and the addition of the external toughening agent is too high to cause poor heat resistance of the phenolic molding compound. In the present invention, the outer toughening agent may be controlled to account for 5% to 15% of the total weight of the shell part, for example, 5%,8%,10%,12%,15%, etc.
Thus, according to the case 10 of the sound generating apparatus 100 of the embodiment of the present invention, by providing the external toughening agent in the case portion, the heat resistance of the case portion can be ensured on the basis of effectively ensuring the strength of the case portion, thereby ensuring the strength and heat resistance of the case 10 of the sound generating apparatus 100.
In other embodiments of the invention, the housing portion further comprises: the internal toughening agent reacts with phenolic hydroxyl groups of the phenolic resin to form a network structure, and the internal toughening agent is at least one of polyvinyl alcohol, polyvinyl acetal, polyamide, epoxy resin, cashew nut shell oil, maleimide, tung oil and polysulfone.
In other words, the shell 10 of the sound generating device 100 according to the embodiment of the present invention may further include an internal toughening agent disposed in the shell portion, the internal toughening agent may be added during the synthesis stage of the phenolic resin, the internal toughening agent reacts with phenolic hydroxyl groups of the phenolic resin, and a macromolecular flexible chain is introduced on the phenolic hydroxyl groups to improve the crosslinking density thereof and form an interpenetrating network structure, thereby enhancing the strength of the shell 10 of the sound generating device 100.
According to one embodiment of the invention, the housing 10 is entirely made up of a housing part.
In other words, the housing 10 of the sound generating apparatus 100 according to the embodiment of the present invention may be partially formed of the housing part, and the rest may be formed of the conventional preparation materials in the art, or may be integrally formed of the housing part, that is, the housing 10 of the sound generating apparatus 100 may be integrally formed of phenolic molding compound.
Therefore, the whole shell 10 of the sound generating device 100 is formed by the shell part, so that the sound generating device is convenient to prepare, and the mass ratio of phenolic resin to reinforcing materials in phenolic molding compound can be controlled more accurately, so that the strength and the shock resistance of the shell 10 of the sound generating device 100 are effectively ensured. And the integrally formed shell 10 is compared with an injection-molded steel sheet product, the Fh resonance frequency is equivalent, and the basic performance of the sound generating device 100 is not affected on the basis of improving the strength of the shell 10.
In some embodiments of the invention, the bending strength of the shell portion is greater than 90MPa; and/or the notch impact strength of the shell part is greater than 3kJ/m 2; and/or the shell portion has a density of less than 2.1g/cm 3.
Specifically, the bending strength of the housing part may directly affect the strength and the deformation resistance of the casing 10 of the sound generating device 100, and the bending strength of the housing part is too small, which may cause the casing 10 to deform when the sound generating device 100 falls or collides, the deformation area of the casing 10 may further affect the volumes of the front acoustic cavity 111 and the rear acoustic cavity 121 of the sound generating device 100, and the volume of the front acoustic cavity 111 becomes larger, which may cause the Total Harmonic Distortion (THD) of the sound generating device 100 to increase, and the volume of the rear acoustic cavity 121 becomes larger, which may cause the F0 of the sound generating device 100 to be unstable, affecting the product performance of the sound generating device 100. In addition, the larger impact strength can enable the sound generating device 100 to absorb mechanical energy and convert the mechanical energy into heat energy in the falling or collision process, so as to protect the sound state of the shell 10 structure of the sound generating device 100 and avoid cracking of the shell 10 of the sound generating device 100 after falling due to the too low notch impact strength. The overall density of the shell 10 is controllable, so that the quality of the shell 10 can be effectively controlled, and the lightweight design of the shell 10 is realized
According to some embodiments of the invention, the housing 10 is integrally injection molded or transfer molded.
That is, the housing 10 may be manufactured by an integral molding method, which is simple and feasible, is convenient to operate, and can further control the manufacturing cost.
As shown in fig. 1, a sound generating device 100 according to an embodiment of the present invention includes a housing 10 of the sound generating device 100 according to any one of the above embodiments, and the sound generating device 100 further includes a sound generating unit 20 disposed in the housing 10, and performs electroacoustic conversion to achieve sound generating performance of the sound generating device 100. Wherein, the front acoustic cavity 111 and the rear acoustic cavity 121 are provided in the housing 10, a portion of the housing 10 corresponding to the front acoustic cavity 111 is formed as a front cavity housing 11, and a portion of the housing 10 corresponding to the rear acoustic cavity 121 is formed as a rear cavity housing 12. At least a part of the front cavity housing 11 and the rear cavity housing 12 of the sound generating device 100 are made of a housing part, so that not only the strength requirement of the housing 10 of the sound generating device 100 can be met, but also the acoustic performance of the sound generating device 100 can be ensured.
The electronic device according to the embodiment of the present invention includes the sound generating apparatus 100 according to the above embodiment, wherein 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, a smart speaker, etc., to which the present invention is not limited.
Since the housing 10 of the sound generating apparatus 100 according to the above-described embodiment of the present invention has the above-described technical effects, the sound generating apparatus 100 and the electronic device according to the embodiment of the present invention also have the corresponding technical effects, that is, the housing 10 of the sound generating apparatus 100 has better strength and impact resistance, while also improving the acoustic performance of the 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.
Examples
Firstly, synthesizing a phenolic resin, wherein phenol and formaldehyde are selected as raw materials, the molar ratio of the phenol to the formaldehyde is 1:0.85, and 1% oxalic acid is added for reaction to generate the phenolic resin.
The prepared linear phenolic resin (30% by mass), high-strength glass fiber ER13 (55% by mass) with the length of 3mm, hexamethylenetetramine (12% by mass) and carbon black are selected to be mixed, heated, mixed, cooled and crushed into granules.
Taking granules for injection molding, wherein the injection molding temperature is 100 ℃, the molding temperature is 175 ℃, the integral structure of the front cavity and the rear cavity of the shell is formed by adopting the granules for injection molding, the front cavity area of the shell after molding is a plane area, the size of the plane area is 14.3mm 11.5mm, and the thickness is 0.2mm. Because the phenolic molding compound has higher strength, the thickness of the whole shell is reduced by 0.1mm except for the plane area of the front cavity, and the volume is 338mm 3.
Comparative example 1
The 20% glass fiber reinforced PC particles are selected to integrally injection-mold the shell with the same shape as in the embodiment, the thickness of the front cavity area of the shell needs to be 0.5mm, the rigidity can meet the requirement, and in this case, the whole shell volume is 408mm 3.
Comparative example 2
Firstly, forming a steel sheet with the thickness of 0.2mm in a front cavity area of the shell, wherein the steel sheet has the same size as that of a plane area of the shell in the embodiment, the size is 14.3mm x 11.5mm, then, placing the steel sheet in an injection mold in advance, and using 20% glass fiber reinforced PC particles as an injection molding material, wherein the volume of the whole prepared shell is 368mm 3, the volume of the steel sheet is 40mm 3, and the volume of the injection molding material is 328mm 3.
The housings 10 of the sound emitting devices 100 obtained in examples and comparative examples 1 and 2 were subjected to weight test and comparison:
The density of the housing prepared from the phenolic resin molding compound in the examples was 1.79g/cm 3 and the weight of the housing was 605mg. The weight of the PC injection molded case in comparative example 1 was 547mg, the weight of the case in comparative example 2 was 742mg, and the case prepared by using the phenolic resin molding compound in the examples was 137mg lighter than the case prepared by using comparative example 2, and the overall weight was reduced by 18%.
It can be seen that the housing 10 of the sound generating apparatus 100 according to the embodiment of the invention is made by adopting the housing part containing phenolic molding compound for the housing 10, and is light in weight and beneficial to lightweight design on the basis of ensuring strength.
The housings 10 of the examples and the comparative examples were assembled into sound emitting devices 100, respectively, which were subjected to high-frequency resonance and low-frequency resonance tests, respectively, and the test results are shown in fig. 2 and 3.
As can be seen from fig. 2 and 3, the rigidity and the space size of the front cavity of the housing 10 mainly affect the high-frequency resonance frequency and the low-frequency THD of the sound generating device, and the housing 10 using the phenolic molding compound in the embodiment is equivalent to the FR performance of comparative examples 1 and 2, but the housing 10 in comparative example 1 occupies the front cavity space due to the thickness thickening, which results in the THD rising not meeting the product requirement, and the front cavity space is small, which results in the resonance rising, and the hearing of the sound generating device 100 is deteriorated.
In summary, according to the housing 10 of the sound generating apparatus 100 of the embodiment of the present invention, on the basis of ensuring the rigidity requirement of the product, the weight of the product can be effectively reduced, and meanwhile, the acoustic performance of the product is ensured, so as to meet the high-frequency and low-frequency use requirements of the sound generating apparatus 100.
The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.
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 (14)
1. The shell of the sound production device is characterized by comprising a shell part, wherein the shell part is at least made of phenolic molding plastic, the phenolic molding plastic contains phenolic resin and reinforcing materials, the phenolic resin accounts for 20% -65% of the total weight of the phenolic molding plastic, the reinforcing materials account for 35% -80% of the total weight of the phenolic molding plastic, the bending modulus of the shell part is greater than 7GPa, the reinforcing materials are at least one of alkali-free glass fibers and high-strength glass fibers, and the fiber length of the reinforcing materials is 0.3-15 mm.
2. The sound emitting apparatus housing of claim 1, wherein the shell portion further comprises: the surface treatment agent is used for carrying out surface treatment on the reinforcing material, and is at least one of silane coupling agent, titanate coupling agent, organic chromium complex and zirconium compound.
3. The sound emitting device housing of claim 1, wherein the phenolic resin is formed from at least one of a phenolic novolac resin and a phenolic resole resin crosslinked.
4. The sound emitting device housing of claim 3, wherein the phenolic resin is formed by crosslinking the phenolic novolac resin with a crosslinking agent, wherein the phenolic novolac resin is synthesized by catalytic synthesis after adding a catalyst to phenolic monomers and aldehyde monomers, and the molar ratio of phenolic hydroxyl groups in the phenolic monomers to aldehyde groups in the aldehyde monomers is 1: 0.7-1: 0.95.
5. The housing of the sound generating apparatus according to claim 4, wherein the catalyst is an acidic catalyst, and the ratio of the catalyst to the addition amount of the phenolic monomer is 0.5% -1.5%;
And/or the cross-linking agent is hexamethylenetetramine, and the mass ratio of the cross-linking agent to the phenolic novolac resin is 2% -15%.
6. The sound emitting device housing of claim 3, wherein the phenolic resin is formed by thermal crosslinking of the resole resin, wherein the resole resin is synthesized catalytically after a catalyst is added to a phenolic monomer and an aldehyde monomer, and the molar ratio of phenolic hydroxyl groups in the phenolic monomer to aldehyde groups in the aldehyde monomer is 1: 1-1: 1.5.
7. The sound emitting device housing of claim 6, wherein the catalyst is an alkaline catalyst and the ratio of the catalyst to the phenolic monomer is 0.3% -1.7%.
8. The sound emitting apparatus housing of claim 1, wherein the shell portion further comprises: the external toughening agent is at least one of rubber, thermoplastic resin polyamide, PBT, polyurethane and polyphenyl ether, and accounts for 5-15% of the total weight of the shell part in percentage by mass.
9. The sound emitting apparatus housing of claim 1, wherein the shell portion further comprises: the internal toughening agent reacts with phenolic hydroxyl groups of the phenolic resin to form a flexible chain, and the internal toughening agent is at least one of polyvinyl alcohol, polyvinyl acetal, polyamide, epoxy resin, cashew nut shell oil, maleimide, tung oil and polysulfone.
10. The housing of a sound emitting device according to claim 1, wherein the housing is entirely made up of the shell portion.
11. The enclosure of the sound emitting device of claim 1, wherein the bending strength of the shell portion is greater than 90MPa;
and/or the notch impact strength of the shell part is greater than 3kJ/m 2;
and/or the density of the shell part is less than 2.1g/cm 3.
12. The sound emitting device housing of claim 1, wherein the housing is integrally injection molded or transfer molded.
13. A sound emitting device, comprising:
the enclosure of the sound emitting device of any one of claims 1-12.
14. An electronic device comprising the sound emitting apparatus of claim 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211263188.XA CN115746497B (en) | 2022-10-14 | 2022-10-14 | Shell of sound generating device, sound generating device with shell and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211263188.XA CN115746497B (en) | 2022-10-14 | 2022-10-14 | Shell of sound generating device, sound generating device with shell and electronic equipment |
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| CN115746497A CN115746497A (en) | 2023-03-07 |
| CN115746497B true CN115746497B (en) | 2024-05-14 |
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| CN115175056A (en) * | 2022-06-30 | 2022-10-11 | 歌尔股份有限公司 | Shell of sound generating device, sound generating device with shell and electronic equipment |
| CN115175052A (en) * | 2022-06-30 | 2022-10-11 | 歌尔股份有限公司 | Shell of sound generating device, sound generating device and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004527971A (en) * | 2001-05-11 | 2004-09-09 | ニュー トランスデューサーズ リミテッド | Loudspeaker |
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| DE202010015851U1 (en) * | 2010-07-06 | 2011-02-10 | Elac Electroacustic Gmbh | Speaker with an exciter |
| CN104830018A (en) * | 2014-02-12 | 2015-08-12 | 日清纺制动器株式会社 | Functional Material for Acoustic Equipment |
| CN107075142A (en) * | 2014-10-21 | 2017-08-18 | 东丽株式会社 | Fiber-reinforced thermoplastic resin products formed and fiber-reinforced thermoplastic resin moulding material |
| CN109912926A (en) * | 2019-03-29 | 2019-06-21 | 昆山森华化工有限公司 | One kind is for molding phenolaldehyde moulding compound of automobile component and preparation method thereof |
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| CN115746497A (en) | 2023-03-07 |
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