CN118102194A - Sound absorption block, preparation method thereof, sounding module and electronic equipment - Google Patents
Sound absorption block, preparation method thereof, sounding module and electronic equipment Download PDFInfo
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- CN118102194A CN118102194A CN202410502436.4A CN202410502436A CN118102194A CN 118102194 A CN118102194 A CN 118102194A CN 202410502436 A CN202410502436 A CN 202410502436A CN 118102194 A CN118102194 A CN 118102194A
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Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention provides a sound-absorbing block, a preparation method thereof, a sound-producing module and electronic equipment, wherein the sound-absorbing block comprises a plurality of sound-absorbing particles and a plurality of bonding particles, the bonding particles are switched from a first form to a second form when heated, and an adhesive layer is formed on the surface of the bonding particles in the second form so as to connect the sound-absorbing particles adjacent to the bonding particles, so that the sound-absorbing particles and the bonding particles are connected to form a block structure. In the invention, the sound-absorbing particles and the bonding particles are bonded together after heat treatment, so that the sound-absorbing block with a block structure is formed. The sound-absorbing block is arranged in the rear sound cavity of the sound-producing module, so that the flow and friction of sound-absorbing particles in the rear sound cavity are eliminated, and the technical problem that the sound-absorbing particles are easy to break is solved.
Description
Technical Field
The invention belongs to the technical field of acoustics, and particularly relates to a sound absorption block, a preparation method thereof, a sound production module with the sound absorption block and electronic equipment.
Background
In recent years, under the trend of increasingly lighter and thinner electronic products, the space left for speakers is becoming smaller. Along with flattening of the micro speaker module, the volume of the cavity of the acoustic rear sound cavity is reduced, so as to solve the problem of low-frequency performance reduction of the speaker caused by space reduction, and technicians fill sound-absorbing particles made of porous materials (such as active carbon, natural zeolite powder, active silica, porous alumina, molecular sieves or a mixture made according to specific types and proportions) into the rear sound cavity of the speaker module, and utilize special physical pore channel structures in the porous materials to quickly adsorb and desorb gas of the rear sound cavity, so that the effect of virtual increase of the resonance space of the acoustic rear cavity of the speaker is realized, thereby effectively reducing the resonance frequency F0 of the speaker and improving the low-frequency sensitivity.
In the related art, sound-absorbing particles are filled in a rear sound cavity of the speaker module, the filling volume of the sound-absorbing particles accounts for 70% -90% of the total volume of the rear cavity, and the sound-absorbing particles are flowable in the rear sound cavity. Under the working condition of larger amplitude, the sound-absorbing particles vibrate violently in the rear sound cavity, the sound-absorbing particles are broken or collide with the wall of the cavity, and powder produced by the broken sound-absorbing particles enters the inside of the loudspeaker monomer to cause pollution, so that the acoustic performance of the loudspeaker is invalid.
Disclosure of Invention
An object of the present invention is to provide a sound-absorbing block, which can at least solve the technical problem that in the prior art, under the condition of larger amplitude working, the sound-absorbing particles in the rear sound cavity are easy to generate dust.
The invention also provides a preparation method of the sound-absorbing block, which can prepare the sound-absorbing block.
The invention also provides a sound generating module which comprises the sound absorbing block.
The invention also provides electronic equipment comprising the sounding module.
According to a first aspect of the present invention, there is provided a sound-absorbing block comprising a plurality of sound-absorbing particles and a plurality of bonding particles, the bonding particles switching from a first configuration to a second configuration when heated, in the second configuration, the bonding particles forming an adhesive layer on a surface thereof to connect the sound-absorbing particles adjacent thereto so as to connect the plurality of sound-absorbing particles and the plurality of bonding particles to form the sound-absorbing block of a block structure.
Optionally, the sound-absorbing block further comprises an auxiliary agent, the auxiliary agent is uniformly mixed with the plurality of sound-absorbing particles and the plurality of bonding particles, and the auxiliary agent comprises at least one of polar organic matters, nonionic surfactants, anionic surfactants and thickeners.
Optionally, the polar organic matter is at least one of alcohols, acids, ketones, aldehydes and esters solvents; and/or the nonionic surfactant is at least one of polyoxyethylene type, polyol type, alkanolamide type, polyether type and amine oxide type surfactants; and/or the anionic surfactant is at least one of sulfonate, sulfate, phosphate and fatty acid salt; and/or the thickener is at least one of gelatin, seaweed gel, xanthan gum, methyl cellulose and carboxymethyl cellulose.
Optionally, the sound absorbing block is further provided with: the coating layer is arranged on at least one side surface of the sound absorption block and is provided with a plurality of breathable air holes, wherein the coating layer is at least one of fiber woven cloth, non-woven cloth and a hot melt net film; or, the coating layer is made of at least one material selected from the group consisting of polyamide, polyester, polyurethane and polyolefin.
Optionally, the coating layer is heated and softened to be adhered to the outer surface of the sound absorption block, and the softening point of the coating layer is 80-200 ℃; and/or the thickness of the coating layer is less than 100 μm; and/or the pore diameter of the ventilation hole is 10-1000 μm.
Optionally, the bonding particles are thermoplastic polymer particles or thermosetting polymer particles.
Optionally, when the bonding particles are thermoplastic polymer particles, the bonding particles include at least one of polyurethane, polyamide, polymethyl methacrylate, polyethylene, polypropylene, polystyrene, copolyester, ethylene-vinyl acetate copolymer, random copolymer of ethylene and α -olefin, polyolefin/ethylene acrylic acid copolymer, polycaprolactone, acrylonitrile-butadiene-styrene, polycarbonate, polyethylene terephthalate, polyimide, polyetherimide, polyarylate, and polyaryletherketone; and/or, when the bonding particles are thermosetting polymer particles, the bonding particles comprise at least one of phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, unsaturated polyester resin, epoxy resin, organic silicon resin, styrene-butadiene rubber, nitrile rubber and ethylene propylene rubber.
Optionally, the softening point of the bonding particles is 80 ℃ to 300 ℃.
Optionally, the shape of the bonding particles in the first form is spheroid, wedge-shaped, block-shaped or irregular; and/or the shape of the bonding particles in the second form is spheroid, filiform, strip-like or irregular.
Optionally, the particle size of the bonding particles is 20% -95% of the particle size of the sound absorbing particles; and/or the volume ratio of the bonding particles to the sound absorbing particles is 0.05-0.8; and/or the particle diameter of the sound absorbing particles is 50 μm to 1000 μm.
According to a second aspect of the present invention, there is provided a method for producing a sound-absorbing block according to any one of the above, comprising the steps of: mixing the sound-absorbing particles and the bonding particles with the first form uniformly to obtain mixed particles; filling the mixed particles into a tool with a preset shape; performing heat treatment on the tooling filled with the mixed particles, wherein the heat treatment comprises heating, heat radiation or light radiation, and the bonding particles are switched from the first form to the second form; and cooling the tool to room temperature to obtain the sound absorption block.
Optionally, the preparation method of the sound absorption block further comprises the following steps: abutting a coating layer on at least one side surface of the sound absorption block, and heating and softening the coating layer so as to adhere the coating layer to the sound absorption block; or further comprising: after the coating layer is arranged on at least a part of the inner surface of the tool, the mixed bonding particles and sound absorbing particles are transposed in the tool provided with the coating layer.
According to a third aspect of the present invention, there is provided a method for producing a sound-absorbing block according to any one of the above, comprising the steps of: adding an auxiliary agent into water, and dispersing sound-absorbing particles and bonding particles into the water to form slurry; coating the slurry in a tool with a preset shape; performing heat treatment on the tool coated with the slurry, wherein the heat treatment comprises heating, heat radiation or light radiation, and the bonding particles are switched from the first form to the second form; and cooling the tool to room temperature to obtain the sound absorption block.
Optionally, the preparation method of the sound absorption block further comprises the following steps: abutting a coating layer on at least one side surface of the sound absorption block, and heating and softening the coating layer so as to adhere the coating layer to the sound absorption block; or further comprising: after the coating layer is arranged on at least a part of the inner surface of the tool, the mixed bonding particles and sound absorbing particles are transposed in the tool provided with the coating layer.
Optionally, the surface density of the coating layer is 2g/m 2-40g/m2.
According to a fourth aspect of the present invention, there is provided a sound emitting module, including a sound emitting unit, a housing, and an internal cavity surrounded by the housing and the sound emitting unit, wherein the internal cavity is filled with the sound absorbing block according to any one of the above.
According to a fifth aspect of the present invention, there is provided an electronic device including any one of the above sound emitting modules.
The sound-absorbing block according to the embodiment of the invention is prepared by the sound-absorbing particles and the bonding particles, and the sound-absorbing particles and the bonding particles are bonded together after heat treatment, so that the sound-absorbing block with a block structure is formed. The sound-absorbing block is arranged in the rear sound cavity of the sound-producing module, so that the flow and friction of sound-absorbing particles in the rear sound cavity are eliminated, and the technical problem that the sound-absorbing particles are easy to break 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 view of a sound absorbing block according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of the combination of a sound absorbing block and a cladding layer according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of the combination of a sound absorbing block and a cladding layer in accordance with yet another embodiment of the present invention;
fig. 4 is a schematic diagram of a sound module according to an embodiment of the present invention.
Reference numerals
A sound generating module 100;
A housing 10; a rear acoustic cavity 11;
A sounding unit 20;
a sound-absorbing block 30; sound absorbing particles 31; bonding particles 32;
and a coating layer 40.
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 sound-absorbing block 30 according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings. The sound absorbing block 30 of the present invention may be placed in the sound generating module 100, for example, in the rear sound cavity 11 of the sound generating module 100, and may absorb and desorb air flow, so as to play a role in sound absorption, increase the virtual volume of the rear sound cavity 11 of the sound generating module 100, and improve the low-frequency performance of the sound generating module 100.
As shown in fig. 1, the sound-absorbing block 30 according to the embodiment of the present invention includes a plurality of sound-absorbing particles 31 and a plurality of bonding particles 32, the bonding particles 32 being switched from a first configuration to a second configuration when heated, in the second configuration, the bonding particles 32 forming an adhesive layer on a surface thereof to connect the sound-absorbing particles 31 adjacent thereto so as to connect the plurality of sound-absorbing particles 31 and the plurality of bonding particles 32 to form the sound-absorbing block 30 of a block structure. The sound-absorbing block 30 according to the embodiment of the present invention may be applied to the sound-emitting module 100, for example, the sound-absorbing block 30 is applied to the interior of the rear sound cavity 11 of the housing 10, and thus the sound-absorbing effect may be achieved.
In other words, the sound-absorbing block 30 according to the embodiment of the present invention is mainly composed of the plurality of sound-absorbing particles 31 and the plurality of bonding particles 32, that is, the sound-absorbing block 30 according to the embodiment of the present invention can be manufactured by the plurality of sound-absorbing particles 31 and the plurality of bonding particles 32. When unheated, the bonding particles 32 are in the first configuration, where no adhesive layer is formed on the surface of the bonding particles 32. The bonding particles 32 may be switched from the first configuration to the second configuration when heated, and in the second configuration, the bonding particles 32 form an adhesive layer on the surface thereof to connect the sound-absorbing particles 31 adjacent thereto, and the plurality of sound-absorbing particles 31 and the plurality of bonding particles 32 may be bonded into a monolithic block structure. It will of course be appreciated that there may be instances where an adhesive particle 32 is adjacent to an adhesive particle 32, with two adjacent adhesive particles 32 being adhesively connected to one another in the second configuration.
Thus, in the present embodiment, the sound-absorbing block 30 is prepared by the sound-absorbing particles 31 and the bonding particles 32, and the sound-absorbing particles 31 and the bonding particles 32 are bonded together after heat treatment, forming the sound-absorbing block 30 of a block structure. By adopting the whole sound-absorbing block 30, the whole block structure is beneficial to covering the shape in the rear sound cavity 11 completely, and the sound-absorbing block 30 is not easy to move, so that the situations of moving, collision and the like of the sound-absorbing particles 31 can be eliminated better. The sound absorbing block 30 is arranged in the rear sound cavity 11 of the sound generating module 100, so that the flow and friction of the sound absorbing particles 31 in the rear sound cavity 11 are eliminated, and the technical problem that the sound absorbing particles 31 are easy to break is solved.
Alternatively, the sound-absorbing particles 31 include a plurality of porous raw powders and a binder for binding the plurality of porous raw powders together to form the sound-absorbing particles 31. The porous raw powder has a porous structure and has a sound absorbing effect, and the porous raw powder may have a unit structure constituting the sound absorbing particles 31. In addition, the adhesive can combine a plurality of porous raw powders, so that the dispersion among the porous raw powders is avoided, and the probability that the porous raw powders enter the sounding module 100 is reduced. The sound absorbing particles 31 can absorb and desorb air by utilizing the pore canal structure of the porous raw powder, thereby playing a role of expanding the virtual volume.
Optionally, the porous raw powder is porous materials such as active carbon, natural zeolite, molecular sieve, silica aerogel, porous alumina, metal organic framework materials, covalent organic framework materials and the like.
Optionally, the binder comprises at least one of an organic binder and an inorganic binder, and is widely used.
Therefore, the porous raw powder can be made of various porous materials, and the binder can be made of various types, so that the flexibility of material selection is improved.
In a specific example of the present invention, the porous raw powder is zeolite, the mass ratio of silica to alumina of the porous raw powder is less than 200, the particle size of the porous raw powder is > 10 μm, and the plurality of porous raw powders are bonded by an inorganic binder to form the sound-absorbing particles 31. By using zeolite, cost can be reduced and sound absorbing effect can be improved. By employing zeolite in combination with an inorganic binder, higher heating temperatures can be tolerated. By adopting the zeolite with the silicon-aluminum mass ratio of the grain diameter smaller than 200 and the grain diameter larger than 10 mu m, the zeolite can be ensured to have more aluminum atoms, more negative charges exist in the zeolite, polar sites of the zeolite are increased, and the zeolite has better binding force after being combined with an inorganic binder, so that the sound-absorbing particles 31 can resist vibration with higher power intensity, the intensity of the sound-absorbing particles 31 is greatly improved, and the acoustic effect of the sound-absorbing particles 31 is ensured. In addition, by adopting zeolite with the particle size of more than 10 μm as the porous raw powder, after the zeolite and the inorganic binder form the sound-absorbing particles 31, the inside of the sound-absorbing particles 31 has a more macroporous structure, so that air molecules can conveniently enter and exit the macroporous structure inside the sound-absorbing particles 31, the zeolite inside the sound-absorbing particles can fully adsorb and desorb the air molecules, the utilization rate of the zeolite inside the sound-absorbing particles 31 is increased, the acoustic performance of the sound-absorbing particles 31 is improved, and the inorganic binder can form a pore channel structure after being dried, so that the acoustic performance of the sound-absorbing particles 31 can be further promoted.
According to an embodiment of the present invention, the sound-absorbing block 30 further includes an auxiliary agent, which is uniformly mixed with the plurality of sound-absorbing particles 31 and the plurality of adhesive particles 32, and which includes at least one of a polar organic substance, a nonionic surfactant, an anionic surfactant, a thickener, and the like.
That is, in the present embodiment, the sound-absorbing block 30 may be prepared by the sound-absorbing particles 31, the adhesive particles 32, and the auxiliary agent. The auxiliary agent may be uniformly mixed with the plurality of sound-absorbing particles 31 and the plurality of bonding particles 32, and by adding the auxiliary agent, the dispersion of the bonding particles 32 in the solvent may be assisted, for example, the uniformity of the dispersion in water may be improved. In addition, the auxiliary agent can be at least one of polar organic matters, nonionic surfactants, anionic surfactants, thickeners and the like, and is widely selected.
In some embodiments of the present invention, the polar organic compound is at least one of an alcohol, an acid, a ketone, an aldehyde, an ester solvent, and the like; and/or the nonionic surfactant is at least one of polyoxyethylene type, polyol type, alkanolamide type, polyether type, amine oxide type surfactants, and the like; and/or the anionic surfactant is at least one of sulfonate, sulfate, phosphate, fatty acid salt and the like; and/or the thickener is at least one of gelatin, seaweed gel, xanthan gum, methyl cellulose, carboxymethyl cellulose and the like.
That is, when polar organic substances are used as the auxiliary agent, alcohols, acids, ketones, aldehydes, ester solvents, etc. may be selected; when the auxiliary agent is a nonionic surfactant, the auxiliary agent may be classified into polyoxyethylene type, polyol type, alkanolamide type, polyether type, amine oxide type and the like according to the structure of the hydrophilic group; in the case of anionic surfactants, sulfonates, sulfates, phosphates and fatty acid salts) or thickeners such as gelatin, seaweed gel, xanthan gum, methylcellulose, carboxymethylcellulose, and the like may be selected.
According to an embodiment of the present invention, as shown in fig. 2 and 3, the sound-absorbing block 30 is further provided with a coating layer 40, the coating layer 40 is provided on at least one side surface of the sound-absorbing block 30, the coating layer 40 is provided with a plurality of ventilation holes, wherein the coating layer 40 is at least one of a fiber woven fabric, a non-woven fabric and a hot melt net film; alternatively, the clad layer 40 is made of at least one material of polyamide, polyester, polyurethane, polyolefin, and the like.
That is, in the present embodiment, the sound-absorbing block 30 is further provided with a coating layer 40, and at least one surface of the sound-absorbing block 30 may be provided with the coating layer 40. In this embodiment, the whole structure of the sound-absorbing block 30 can be reinforced by the coating layer 40, so that the sound-absorbing block 30 is not easy to break during the process of oscillating and falling of the sound-producing module 100, and the coating layer 40 can prevent the sound-absorbing particles 31 falling from the sound-absorbing block 30 from entering the rear sound cavity 11, so as to prevent the occurrence of the dust phenomenon. Wherein, the coating layer 40 is provided with a plurality of breathable holes, so that the influence on the sound absorption effect can be avoided. Alternatively, the coating layer 40 may be one or more of a woven fabric, a nonwoven fabric, a hot melt web, and the like, and may be selected in a wide range. Optionally, the composition of the cladding layer 40 is one or more of polyamide, polyester, polyurethane, polyolefin, and the like.
In some embodiments of the present invention, the coating 40 is softened by heat to adhere to the outer surface of the sound-absorbing block 30, and the coating 40 has a softening point of 80 to 200 ℃, for example, the coating 40 has a softening point of 80 to 100 to 120 to 150 to 160 to 170 to 180 to 190 to 200 to simplify the connection difficulty between the coating 40 and the sound-absorbing block 30. Optionally, the softening point of the coating layer 40 is 110 ℃ to 200 ℃, even if the temperature of the rear acoustic cavity 11 exceeds 100 ℃ when the acoustic module 100 works, since the coating layer 40 is made of a material with the softening point of 110 ℃ to 200 ℃, the coating layer 40 is not easy to soften due to high temperature in the rear acoustic cavity 11, and the coating layer 40 is prevented from losing the coating effect.
According to an embodiment of the present invention, the thickness of the coating layer 40 is less than 100 μm, for example, the thickness of the coating layer 40 is 1 μm, 10 μm, 50 μm, 80 μm, or 90 μm, etc., and by controlling the thickness of the coating layer 40 to be less than 100 μm after the coating layer 40 is provided on the surface of the sound-absorbing block 30, it is possible to prevent the surface of the sound-absorbing block 30 from being sealed due to the total thickness of the coating layer 40 and the sound-absorbing block 30 being high and the thickness of the coating layer 40 being excessively large, causing air to be difficult to enter into the sound-absorbing block 30, whereby the design can ensure smooth air flow into the sound-absorbing block 30, ensuring the sound-absorbing effect of the sound-absorbing block 30.
In some embodiments of the present invention, the vent holes have a diameter of 10 μm to 1000 μm, for example, 10 μm, 50 μm, 100 μm, 200 μm, 500 μm, 800 μm, 900 μm, or 1000 μm, etc., so that not only the overflow of the sound-absorbing particles 31 falling off from the sound-absorbing block 30 can be intercepted, but also the smooth entry of the gas into the interior of the sound-absorbing block 30 can be ensured, and the influence of the provision of the coating layer 40 on the acoustic performance can be avoided.
It should be noted that, by selecting to satisfy at least one of the above-described conditions of the softening point, thickness, pore diameter of the ventilation hole, etc. of the coating layer 40, different demands of the user on the product can be satisfied.
In some embodiments of the present invention, the bonding particles 32 are thermoplastic polymer particles or thermosetting polymer particles. That is, when the bonding particles 32 are heated to a temperature reaching the softening point of the bonding particles 32, the outer layers of the bonding particles 32 are softened and have tackiness. In the embodiment of the present invention, the source of the bonding particles 32 is wide, which is advantageous for cost reduction.
According to an embodiment of the present invention, when the bonding particles 32 are thermoplastic polymer particles, the bonding particles 32 include at least one of polyurethane (TPU), polyamide (PA), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), polystyrene (PS), copolyester (PEs), ethylene-vinyl acetate copolymer (EVA), random copolymer of ethylene (POE) and α -olefin, polyolefin/ethylene acrylic acid copolymer (PO/EAA), polycaprolactone (PCL), acrylonitrile-butadiene-styrene (ABS), polycarbonate (PC), polyethylene terephthalate (PET), polyimide (PI), polyetherimide (PEI), polyarylate (PAR), polyaryletherketone (PEAK), and the like. The bonding particles 32 and the sound absorbing particles 31 are heated to form the sound absorbing block 30 and then are mounted in the housing 10, the softening point of the bonding particles 32 can be in a range higher than the highest tolerable temperature of the housing 10, the vibrating diaphragm and other parts in the sound generating module 100, and the bonding particles 32 are more widely selected, for example, more kinds of thermoplastic polymer particles are selected.
In some embodiments of the present invention, the bonding particles 32 are thermosetting polymer particles, and the bonding particles 32 include at least one of phenolic resin (PF), urea-formaldehyde resin (UF), melamine-formaldehyde resin (MF), unsaturated polyester resin (UF), epoxy resin (EP), silicone resin (SI), styrene-butadiene rubber, nitrile rubber, ethylene-propylene rubber, and the like. By using the above thermosetting polymer particles as the bonding particles 32, the bonding property in the second state is good, and the softening temperature can be controlled to be higher than the usual highest withstand temperature of the sound emitting module 100, for example, the softening point is 130 ℃.
The adhesive particles 32 may be selected to be thermoplastic polymer particles or thermosetting polymer particles, or may be selected to contain both thermoplastic polymer particles and thermosetting polymer particles, and are not limited thereto.
According to one embodiment of the present invention, the softening point of the bonding particles 32 is 80 to 300 ℃, for example, the softening point of the bonding particles 32 is 80 ℃, 100 ℃, 150 ℃,200 ℃, 250 ℃, or 300 ℃, etc., and the outer layer of the bonding particles 32 can form an adhesive layer when heated to the softening point. Alternatively, the softening point of the bonding particles 32 is 110 ℃ to 200 ℃. When the sounding module 100 is operated, even if the temperature of the rear sound cavity 11 exceeds 100 ℃, the adhesive particles 32 with the softening point of 110-200 ℃ are selected, so that the rear sound cavity 11 can be effectively prevented from being softened due to high temperature, and the block structure is effectively prevented from being damaged.
In some embodiments of the present invention, the bonding particles 32 in the first configuration are shaped like spheres, wedges, blocks or irregularities, and it is understood that the bonding particles 32 in the first configuration may have a variety of shapes and may be selected according to the shape of the sound absorbing block 30.
According to one embodiment of the invention, the bonding particles 32 in the second configuration are shaped like spheres, filaments, strips or irregular shapes. It can be seen that the bonding particles 32 of the second form may have various shapes, and the bonding area of the bonding particles 32 of these shapes is larger, which is advantageous for bonding with the sound-absorbing particles 31.
The shape of the adhesive particle 32 in the first form and/or the shape in the second form may be selected to improve product diversity.
According to one embodiment of the present invention, the particle size of the bonding particles 32 is 20% -95% of the particle size of the sound absorbing particles 31. Since the bonding particles 32 are present in the sound-absorbing particles 31 and the stacking space of the sound-absorbing particles 31, if the particle size of the bonding particles 32 is too small, the difficulty in connecting the sound-absorbing particles 31 is increased, the effect of "bridging" is difficult to be exerted, and the sound-absorbing block 30 in the form of a block is difficult to be formed; if the particle diameter of the bonding particles 32 is too large, the bonding stability is liable to be affected, and the stability of the overall block structure is lowered. Therefore, in the present embodiment, the particle size of the bonding particles 32 is 20% -95% of the particle size of the sound-absorbing particles 31, for example, the particle size of the bonding particles 32 is 20%, 30%, 40%, 50%, 60%, 70%, 80% or 95% of the particle size of the sound-absorbing particles 31, so that the difficulty in forming the whole block can be effectively reduced, and the stability of the formed whole block can be improved.
Alternatively, the particle diameter of the bonding particles 32 is 30% -60% of the particle diameter of the sound-absorbing particles 31, and the sound-absorbing block 30 is prepared to have good structural stability.
In some embodiments of the present invention, the ratio of the volume of the bonding particles 32 to the volume of the sound absorbing particles 31 is 0.05 to 0.8. If the volume ratio of the bonding particles 32 to the sound-absorbing particles 31 is less than 0.05, it is easy to cause the total volume of the adhesive layer of the bonding particles 32 to be small, and part of the sound-absorbing particles 31 are not bonded; if the volume ratio of the bonding particles 32 to the sound absorbing particles 31 is greater than 0.8, the ratio of the bonding particles 32 in the rear sound cavity 11 is large, thereby affecting the sound absorbing effect of the sound absorbing block 30 and further affecting the acoustic performance of the sound emitting module 100. In the present embodiment, the volume ratio of the bonding particles 32 to the sound-absorbing particles 31 is 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.7, or 0.8, etc., which can ensure the formation of a stable integral block structure, reduce the movability of the sound-absorbing particles 31, and also ensure the sound-absorbing effect of the sound-absorbing block 30.
According to one embodiment of the present invention, the sound-absorbing particles 31 have a particle size of 50 μm to 1000 μm. When the sound-absorbing particles 31 and the bonding particles 32 are bonded to form the sound-absorbing block 30 outside the housing 10, it is not necessary to consider whether or not the sound-absorbing particles 31 pass through the air-permeable partition of the sound-emitting module 100, and therefore the particle size range of the sound-absorbing particles 31 can be large. If the particle diameter of the sound-absorbing particles 31 is larger than 1000 μm, the difficulty of forming the whole block shape is raised, and the formed sound-absorbing block 30 has a large volume, and the volume of the rear sound chamber 11 is limited, so that it is difficult to assemble the housing 10 with the sound-absorbing block 30 having a large volume. Thus, in the present embodiment, the particle diameter of the sound absorbing particles 31 is 50 μm to 1000 μm, for example, the particle diameter of the sound absorbing particles 31 is 50 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 800 μm or 1000 μm, etc., which is advantageous for forming an overall block structure, and is capable of effectively preventing the sound absorbing particles 31 from being pulverized into the inside of the sound emitting module 100, which is advantageous for ensuring the acoustic performance of the sound emitting module 100.
At least one condition of the particle diameter, the volume, and the like of the adhesive particle 32 may be defined to satisfy the demands of different products.
The invention also provides a preparation method of the sound absorption block 30 according to any one of the above embodiments, which comprises the following steps:
Solid-state mixing the sound-absorbing particles 31 and the bonding particles 32 having the first morphology to obtain mixed particles;
Filling the mixed particles into a tool with a preset shape;
performing heat treatment on the tooling filled with the mixed particles, and switching the bonding particles 32 from the first form to the second form;
And cooling the tool to room temperature to obtain the sound absorption block 30.
In other words, in this embodiment, a method for manufacturing the sound-absorbing block 30 is provided, which may specifically include the following steps:
First, the sound-absorbing particles 31 and the bonding particles 32 are mixed to obtain mixed particles, wherein the bonding particles 32 in the mixed particles are in the first form. For example, a proportion of sound-absorbing particles 31 and bonding particles 32 are solid-state mixed by mechanical stirring or shaking.
Next, the mixed particles are placed in a tooling so as to define the positions of the mixed particles and the shape of the subsequent sound absorbing block 30. For example, the mixed particles are uniformly mixed and then filled in a tool with a specific shape.
The mixed particles are then heated along with the tooling, where the bond particles 32 are heated and can be switched from the first configuration to the second configuration. For example, a tool having a specific shape and containing the mixed particles is subjected to a heat treatment, and the bonding particles 32 are changed from the first form to the second form.
Then, the tooling was cooled to room temperature to obtain the sound absorbing block 30. For example, the tooling is naturally cooled to room temperature to form the sound absorption block 30 with a specific thickness and shape.
The invention also provides a preparation method of the sound absorption block 30 according to any one of the above embodiments, which comprises the following steps:
Adding an auxiliary agent into water, and dispersing the sound-absorbing particles 31 and the bonding particles 32 into the water to form slurry;
coating the slurry in a tool with a preset shape;
Performing heat treatment on the tooling coated with the slurry, and switching the bonding particles 32 from the first form to the second form;
And cooling the tool to room temperature to obtain the sound absorption block 30.
In other words, in this embodiment, there is also provided a method for manufacturing the sound-absorbing block 30, which may specifically include the steps of:
First, an auxiliary agent, sound-absorbing particles 31 and adhesive particles 32 are added to water and mixed to obtain a slurry. For example, an auxiliary agent is added to purified water, and then a certain proportion of sound-absorbing particles 31 and bonding particles 32 are dispersed in an aqueous solution, and stirred and dispersed into a uniform slurry.
The slurry is then applied to a tool, for example, a tool of a particular shape.
The slurry is then heat treated along with the tooling, for example, tooling of a particular shape coated with the slurry is subjected to a process where the bonding particles 32 are transformed from the first configuration to the second configuration.
Next, the tooling was cooled to room temperature together with the internal materials, resulting in the sound absorbing block 30. For example, the tooling is cooled to room temperature to form the sound absorbing block 30 of a particular thickness and shape.
According to one embodiment of the present invention, the heat treatment includes heating, heat radiation, light radiation, or the like, that is, the transition of the bonding particles 32 from the first form to the second form may be achieved through various heat treatment processes, and the bonding between the cover film and the sound-absorbing block 30 may also be achieved.
In some embodiments of the invention, the method of making further comprises: the coating layer 40 is brought into contact with at least one side surface of the sound-absorbing block 30, and the coating layer 40 is softened by heating so that the coating layer 40 is adhered to the sound-absorbing block 30. For example, when the coating layer 40 is provided on at least one surface of the sound-absorbing block 30, the coating layer 40 may be attached to the surface of the sound-absorbing block 30, and the coating layer 40 may be softened by pressing the surface of the coating layer 40 after a predetermined temperature is set by a bonding mold, and the sound-absorbing block 30 including the coating layer 40 may be obtained by bonding the coating layer 40 to the sound-absorbing block 30 as a unified whole.
According to one embodiment of the invention, the preparation method further comprises: after the coating layer 40 is provided on at least a part of the inner surface of the tool, the mixed adhesive particles 32 and sound absorbing particles 31 are transposed into the tool provided with the coating layer 40. For example, the preparation method further comprises: after the coating layer 40 is provided on at least a part of the inner surface of the tooling, the slurry is coated in the tooling provided with the coating layer 40.
It can be seen that when the sound-absorbing block 30 is provided with the coating layer 40 on at least one surface thereof, it can be prepared by various methods as follows:
In the first method, the coating layer 40 is attached to the surface of the sound-absorbing block 30, and after a certain temperature is set by attaching a mold, the coating layer 40 is pressed on the surface of the coating layer 40, and the coating layer 40 is softened and is adhered to the sound-absorbing block 30 into a unified whole, so that the sound-absorbing block 30 containing the coating layer 40 is obtained.
And secondly, coating layers 40 are adhered to the inner sides of the tools, then the slurry is directly coated in the tools adhered with the coating layers 40, and then heating treatment is carried out, so that the bonding of the bonding particles 32 and the sound-absorbing particles 31 and the bonding process of the coating layers 40 can be completed by one-time heating.
In some embodiments of the invention, the areal density of the coating 40 is 2g/m 2-40g/m2. If the areal density of the coating layer 40 is too small, it tends to result in a limited overall reinforcing effect for the sound-absorbing block 30; if the areal density of the coating 40 is too great, air flow into the sound-absorbing block 30 is easily affected. In this embodiment, the surface density of the coating layer 40 is 2g/m 2-40g/m2, for example, the surface density is 2g/m 2、5g/m2、10g/m2、20g/m2、25g/m2、30g/m2 or 40g/m 2, before the coating layer is attached, so that the sound absorption block 30 is not easy to crack during the process of vibration, dropping, etc. of the sound production module 100, and the sound production module 100 also has a good acoustic effect.
Optionally, the surface density of the coating layer 40 is 4g/m 2-15g/m2 before the coating layer is attached, so that the sound-absorbing block 30 is not easy to crack, and the sound-absorbing block has good sound-absorbing effect and light weight.
As shown in fig. 4, the present invention further provides a sound generating module 100, which includes a sound generating unit 20, a housing 10, and an internal cavity surrounded by the housing 10 and the sound generating unit 20, wherein the internal cavity is filled with the sound absorbing block 30 according to any of the foregoing embodiments. For example, the sound absorbing block 30 may be attached to an inner wall of the rear acoustic cavity 11 on at least one side by a double sided tape or may be limited to a cavity of the rear acoustic cavity 11 of the sound emitting module 100 by a space-limiting effect. Since the sound absorbing block 30 of the embodiment of the present invention has good acoustic stability, the sound generating module 100 of the embodiment of the present invention also has the same advantages, and will not be described herein. Alternatively, the sound generating unit 20 may be a speaker unit, and the sound generating module 100 may be a speaker module.
In assembly, the following assembly method can be adopted: the sound-absorbing particles 31 and the adhesive particles 32 are mixed and heated, and the sound-absorbing block 30 is mounted inside the housing 10 after the sound-absorbing block 30 is formed, and the specific mounting manner is not limited herein.
The invention also provides an electronic device, which includes the sounding module 100 according to any of the above embodiments, and since the sounding module 100 of any of the above embodiments has good acoustic stability, the electronic device of the embodiment of the invention also has the same advantages, and will not be described herein. Alternatively, the electronic device may be a mobile phone, a notebook computer, a PAD, a television, or a smart wearable device, etc.
The sounding module 100 of the present invention will be described in detail with specific examples and comparative examples. It is to be understood that the following description is exemplary only and is not intended to limit the invention in any way.
Example 1
The sound absorbing particles 31 in example 1 were obtained by binding zeolite powder with a binder having a particle size of 300 μm to 500 μm, and the binder was a polyacrylate adhesive. The bonding particles 32 are thermoplastic polymer particles, specifically 6208P polyurethane particles, with a softening point of 140 ℃, a particle size of 60-200 μm, and irregular-shaped particles.
The preparation steps of the sound-absorbing block 30 in example 1 include:
(1) 9mL of sound-absorbing particles 31 and 1mL of 6208P polyurethane particles were measured using a 10mL measuring cylinder and placed in a 50mL beaker.
(2) The beaker was placed in an HY-5 rotary shaker, set at 200 times/min frequency, and mixed for 30min.
(3) Using a 0.3mL funnel measuring cup, taking 0.3mL uniformly mixed particles, filling the particles in a tool with a size of 1.2 x 0.6 x 0.4cm, and scraping the surface.
(4) The tooling was placed in an oven at 145 ℃ for 30min.
(5) And after baking, taking out the tooling, and naturally warming the tooling to room temperature.
(6) And taking out the manufactured sound absorption block 30 from the tool.
Example 2
The sound absorbing particles 31 in example 2 were obtained by binding zeolite powder with a binder having a particle size of 300 μm to 500 μm, and the binder was a polyacrylate adhesive. The bonding particles 32 are thermosetting polymer particles, specifically E-20 epoxy resin particles, the softening temperature is 160 ℃, the particle size is 60-200 μm, and the shape is irregular.
(1) 9ML of sound-absorbing particles 31 were measured with 1mL of E-20 epoxy particles in a 50mL beaker using a 10mL measuring cylinder.
(2) The beaker was placed in an HY-5 rotary shaker, set at 200 times/min frequency, and mixed for 30min.
(3) Using a 0.3mL funnel measuring cup, taking 0.3mL uniformly mixed particles, filling the particles in a tool with a size of 1.2 x 0.6 x 0.4cm, and scraping the surface.
(4) The tooling was placed in an oven at 170℃for 30min.
(5) And after baking, taking out the tooling, and naturally warming the tooling to room temperature.
(6) And taking out the manufactured sound absorption block 30 from the tool.
Comparative example
In the comparative example, sound-absorbing particles having a particle diameter of 300 to 500 μm, which are obtained by binding zeolite raw powder with the same binder as in example 1, were used. The volume of the sound-absorbing particles in the comparative example was 0.26mL, which is the same as the volume of the sound-absorbing particles in the sound-absorbing blocks 30 in example 1 and example 2.
The sound-absorbing block 30 obtained in example 1 and example 2 was attached to the long and wide dimension plane of the sound-absorbing block 30 using a Nitto5605 back adhesive, and then attached to the inner side of the upper case or the inner side of the lower case of the speaker, and then the upper and lower cases were assembled, and glued and bonded to produce a complete speaker.
The sound absorbing particles in the comparative example were filled in the rear sound cavity of the same type of speaker, and the whole speaker was manufactured by encapsulating PET.
As can be seen, the above-described speaker models of the respective groups of examples and comparative examples are identical, and the following experiments were performed with respect to the speakers of the examples and comparative examples, respectively:
(1) Acoustic performance evaluation
IMP (impedance test) test is carried out on three groups of speakers by using SoundCheck software, the resonant frequency F0 of the speakers is measured, and the test results are shown in the following table 1;
TABLE 1
| Experimental group | Macromolecular species | V Adhesive particle /V Sound absorbing particles | F0 |
| Example 1 | 6208P polyurethane particles | 0.11 | 769 |
| Example 2 | E-20 epoxy resin particles | 0.11 | 768 |
| Comparative example | / | / | 766 |
As can be seen from table 1, for the speakers of the above examples and comparative examples, F0 can satisfy daily use requirements in the range of 770±35Hz, and thus, it can be seen that the above examples and comparative examples can satisfy the requirements of speakers.
(2) Drop test evaluation
Three groups of speakers are assembled in a 200g falling tool to be fixed, placed in a roller of a roller falling test machine 1m, set the rotation frequency for 20 times/min and the falling times for 600 times, and after the experiment is finished, the sound cavity structure is disassembled to observe whether the powder falling condition exists or not, as shown in table 2.
TABLE 2
| Experimental group | V Adhesive particle /V Sound absorbing particles | Powder removal condition in rear acoustic cavity |
| Example 1 | 0.11 | The sound-absorbing particles are complete and no broken powder exists |
| Example 2 | 0.11 | The sound-absorbing particles are complete and no broken powder exists |
| Comparative example | / | The particle surface is provided with fine powder |
As can be seen from table 2, in example 1 and example 2, after the drop test, the sound-absorbing particles 31 were complete and no broken powder occurred, while the surface of the sound-absorbing particles of comparative example had fine powder falling off and adhered to the rear sound cavity shell and the surface of the monomer.
It can be seen that the sound-absorbing blocks 30 of the embodiment 1 and the embodiment 2 are fixed on the inner wall of the rear sound chamber 11 during the falling process of the speaker, so that no collision occurs, no powder breakage occurs, and the risks of collision and breakage of the sound-absorbing particles 31 are eliminated.
(3) Low temperature BFPP test and evaluation
Three groups of speakers are continuously electrified to work for 24 hours under the environment of-20 ℃ and set voltage of 2.2V and fed with BFPP signals. After the completion of the experiment, the resonant frequency F0 of each group of speakers was measured, and the disassembled product was observed for breakage of the sound absorbing block 30, as shown in table 3.
TABLE 3 Table 3
| Experimental group | F0/Hz before experiment | F0/Hz after the experiment | △F0/Hz | Sound absorbing particles for rear acoustic chambers |
| Example 1 | 769 | 774 | 5 | The sound-absorbing particles are complete and no broken powder exists |
| Example 2 | 768 | 776 | 8 | The sound-absorbing particles are complete and no broken powder exists |
| Comparative example | 766 | 790 | 24 | The surface of the sound-absorbing particles is provided with fine powder |
As can be seen from table 3, after the low temperature BFPP experiment, the resonant frequency F0 of the speakers of example 1 and example 2 was almost unchanged, the variation was within 10Hz, and the variation of the speaker F0 of the comparative example was slightly higher, 24Hz, which was inferior to the two groups of examples.
The speakers after experiments of the two groups of examples and the comparative example are disassembled, the condition of sound-absorbing particles in the rear sound cavity is observed, the sound-absorbing particles 31 in the rear sound cavity 11 of the speakers of the two groups of examples are complete, no broken powder exists, the sound-absorbing particles of the comparative example are unbroken, but fine powder falls off, and the sound-absorbing particles are adhered to the surfaces of the shell of the rear sound cavity and the monomers and enter the magnetic circuit, so that the acoustic performance of the speakers is affected.
Thus, the schemes of example 1 and example 2 both meet this reliability test requirement and are superior to the comparative example.
By comparing the above experimental results, it can be seen that, although the acoustic performance of the speakers of the examples and the comparative examples can meet the daily use requirement, the speakers of the examples are more resistant to falling and more suitable for the low temperature reliability test than the comparative examples.
In summary, the sound-absorbing block 30 according to the embodiment of the present invention is prepared by the sound-absorbing particles 31 and the bonding particles 32, and the sound-absorbing particles 31 and the bonding particles 32 are bonded together after heat treatment, forming a block-shaped structure. Through adopting a monoblock sound absorbing block 30, whole massive structure is favorable to covering completely the shape in back sound cavity 11, is difficult for appearing sound absorbing block 30 and removes in back sound cavity 11 to the condition such as sound absorbing granule 31 removal, collision that can be better are eliminated. The sound generating module 100 and the electronic device applying the sound absorbing block 30 of the embodiment of the invention have stable acoustic performance as well.
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 (17)
1. A sound-absorbing block comprising a plurality of sound-absorbing particles and a plurality of bonding particles, wherein the bonding particles switch from a first configuration to a second configuration when heated, and wherein in the second configuration, the bonding particles form an adhesive layer on their surfaces to connect the sound-absorbing particles adjacent thereto so as to connect the plurality of sound-absorbing particles and the plurality of bonding particles to form the sound-absorbing block of a block structure.
2. The sound absorbing block of claim 1, further comprising an auxiliary agent, the auxiliary agent being homogeneously mixed with the plurality of sound absorbing particles and the plurality of binding particles, the auxiliary agent comprising at least one of a polar organic compound, a nonionic surfactant, an anionic surfactant, and a thickener.
3. The sound absorbing block of claim 2, wherein the polar organic compound is at least one of an alcohol, an acid, a ketone, an aldehyde, and an ester solvent;
And/or the nonionic surfactant is at least one of polyoxyethylene type, polyol type, alkanolamide type, polyether type and amine oxide type surfactants;
and/or the anionic surfactant is at least one of sulfonate, sulfate, phosphate and fatty acid salt;
and/or the thickener is at least one of gelatin, seaweed gel, xanthan gum, methyl cellulose and carboxymethyl cellulose.
4. The sound absorbing block of claim 1, further comprising: the coating layer is arranged on at least one side surface of the sound absorption block, and is provided with a plurality of breathable air holes, wherein,
The coating layer is at least one of fiber woven cloth, non-woven cloth and hot melt net film;
Or, the coating layer is made of at least one material selected from the group consisting of polyamide, polyester, polyurethane and polyolefin.
5. The sound-absorbing block according to claim 4, wherein the coating layer is softened by heat to adhere to the outer surface of the sound-absorbing block, and the softening point of the coating layer is 80 ℃ to 200 ℃;
And/or the thickness of the coating layer is less than 100 μm;
And/or the pore diameter of the ventilation hole is 10-1000 μm.
6. The sound absorbing block of claim 1, wherein the bonding particles are thermoplastic polymer particles or thermosetting polymer particles.
7. The sound absorbing block of claim 6, wherein when the bonding particles are thermoplastic polymer particles, the bonding particles comprise at least one of polyurethane, polyamide, polymethyl methacrylate, polyethylene, polypropylene, polystyrene, copolyester, ethylene-vinyl acetate copolymer, random copolymer of ethylene and α -olefin, polyolefin/ethylene acrylic acid copolymer, polycaprolactone, acrylonitrile-butadiene-styrene, polycarbonate, polyethylene terephthalate, polyimide, polyetherimide, polyarylate, and polyaryletherketone; and/or the number of the groups of groups,
When the bonding particles are thermosetting polymer particles, the bonding particles comprise at least one of phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, unsaturated polyester resin, epoxy resin, organic silicon resin, styrene-butadiene rubber, nitrile rubber and ethylene propylene rubber.
8. The sound absorbing block of claim 1, wherein the bonding particles have a softening point of 80 ℃ to 300 ℃.
9. The sound absorbing block of claim 1, wherein the bonding particles in the first configuration are spheroid, wedge, block or irregular in shape; and/or the shape of the bonding particles in the second form is spheroid, filiform, strip-like or irregular.
10. The sound-absorbing block of claim 1, wherein the particle size of the binding particles is 20% -95% of the particle size of the sound-absorbing particles;
And/or the volume ratio of the bonding particles to the sound absorbing particles is 0.05-0.8;
And/or the particle diameter of the sound absorbing particles is 50 μm to 1000 μm.
11. A method for producing a sound-absorbing block according to any one of claims 1 to 10, comprising the steps of:
Mixing the sound-absorbing particles and the bonding particles with the first form uniformly to obtain mixed particles;
Filling the mixed particles into a tool with a preset shape;
Performing heat treatment on the tooling filled with the mixed particles, wherein the heat treatment comprises heating, heat radiation or light radiation, and the bonding particles are switched from the first form to the second form;
And cooling the tool to room temperature to obtain the sound absorption block.
12. The method for producing a sound-absorbing block according to claim 11, further comprising:
Abutting a coating layer on at least one side surface of the sound absorption block, and heating and softening the coating layer so as to adhere the coating layer to the sound absorption block;
Or further comprising:
after the coating layer is arranged on at least a part of the inner surface of the tool, the mixed bonding particles and sound absorbing particles are transposed in the tool provided with the coating layer.
13. A method for producing a sound-absorbing block according to any one of claims 1 to 10, comprising the steps of:
adding an auxiliary agent into water, and dispersing sound-absorbing particles and bonding particles into the water to form slurry;
Coating the slurry in a tool with a preset shape;
Performing heat treatment on the tool coated with the slurry, wherein the heat treatment comprises heating, heat radiation or light radiation, and the bonding particles are switched from a first form to a second form;
And cooling the tool to room temperature to obtain the sound absorption block.
14. The method for producing a sound-absorbing block according to claim 13, further comprising:
Abutting a coating layer on at least one side surface of the sound absorption block, and heating and softening the coating layer so as to adhere the coating layer to the sound absorption block;
Or further comprising:
after the coating layer is arranged on at least a part of the inner surface of the tool, the mixed bonding particles and sound absorbing particles are transposed in the tool provided with the coating layer.
15. The method of producing a sound-absorbing block according to claim 14, wherein the coating layer has an areal density of 2g/m 2-40g/m2.
16. A sound production module, characterized by comprising a sound production monomer, a shell and an internal cavity enclosed by the shell and the sound production monomer, wherein the internal cavity is filled with the sound absorption block according to any one of claims 1-10.
17. An electronic device comprising the sound emitting module of claim 16.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410502436.4A CN118102194A (en) | 2024-04-25 | 2024-04-25 | Sound absorption block, preparation method thereof, sounding module and electronic equipment |
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| CN202410502436.4A CN118102194A (en) | 2024-04-25 | 2024-04-25 | Sound absorption block, preparation method thereof, sounding module and electronic equipment |
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