Sound absorption assembly, sound production device and electronic equipment

Abstract

The utility model discloses a sound absorption assembly, sound production device and electronic equipment, the sound absorption assembly comprises a shell and a sound absorption material filled in the shell, the shell comprises a porous structure, the porosity of the shell is 30-90%, the thickness of the shell is 0.05-0.5 mm, the sound absorption material comprises at least one of sound absorption particles and sound absorption raw powder, and the sound absorption particles and the sound absorption raw powder are arranged in the shell. The sound-absorbing particles comprise a plurality of sound-absorbing raw powder and an adhesive for bonding the plurality of sound-absorbing raw powder into a whole. According to the utility model, the sound-absorbing material is packaged in the shell, so that the problem of pollution caused by collision and crushing of sound-absorbing particles can be solved, the porosity of the shell is 30-90%, the air permeability is good, the acoustic performance of the sound-absorbing material cannot be influenced, the shell can also provide a certain sound-absorbing effect, the thickness of the shell is 0.05-0.5 mm, the occupied volume of a rear cavity is small, and the sound-absorbing material can be used as a sound-absorbing material. Therefore, the overall sound absorption effect of the sound absorption assembly can be improved, and the low-frequency acoustic performance of the sound production device is improved.

Description

Technical Field

[0001] The utility model relates to the field of acoustics, and particularly to a sound absorption component, a sound generating device and an electronic device. Background Technique

[0002] In recent years, under the general trend of the increasing thinning of electronic products, the space left for the speaker is getting smaller and smaller. With the flattening of the micro speaker module, the volume of the acoustic rear cavity is reduced. In order to solve the problem of the reduction of the low-frequency performance of the speaker caused by the reduction of the space, sound absorption particles made of porous materials can be filled into the rear sound cavity, and the rapid adsorption-desorption property of the rear cavity gas by the special physical pore structure inside the porous material is utilized to realize the virtual increase effect of the resonance space of the speaker acoustic rear cavity, so as to effectively reduce the resonance frequency F0 of the speaker and improve the low-frequency sensitivity.

[0003] In the existing speaker rear cavity, the sound absorption particles are directly filled. During the working process, the friction and collision between the particles are easy to cause the problems of fragmentation and powder falling. The broken dust enters the sounding element and causes abnormal operation, resulting in an increase in F0 and poor low-frequency effect. In the related art, it is proposed to use a plastic shell to encapsulate the particles, which can solve the problem of particle collision and fragmentation, but the plastic shell itself will occupy a certain volume of the rear cavity, further affecting the low-frequency performance of the speaker. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a sound absorption component, a sound generating device and an electronic device, aiming to solve the technical problem that the sound absorption particles filled in the existing speaker rear cavity are easy to break and affect the low-frequency performance of the speaker.

[0005] To achieve the above purpose, the utility model provides a sound absorption component, which includes a shell and a sound absorption material filled in the shell. The shell includes a porous structure, the porosity of the shell is 30-90%, the thickness of the shell is 0.05-0.5 mm, the sound absorption material includes at least one of sound absorption particles and sound absorption raw powder, and the sound absorption particles include a plurality of sound absorption raw powders and an adhesive for bonding the plurality of sound absorption raw powders into one body.

[0006] In one embodiment, the shell includes a main body part and a cover part. The main body part defines an accommodation space, the sound absorption material is filled in the accommodation space, and the cover part is covered on the main body part to seal the accommodation space. Among them, the main body part is a porous structure, and the cover part is a porous structure or a closed structure.

[0007] In one embodiment, the porous structure is formed by stacking fiber filaments, and the filament diameter of the fiber filaments is 0.2-30 μm; and / or, the softening point of the fiber filaments is greater than or equal to 100 °C.

[0008] In one embodiment, the main body portion includes at least one of fiber fabric, non-woven fabric, hot melt web, open-cell polymer foam material, open-cell foam metal, and open-cell foam ceramic.

[0009] In one embodiment, the capping portion is double-sided tape, hot melt adhesive, plastic film, foam metal, foam ceramic, or the same material as the main body portion, and the main body portion and the capping portion are connected by hot melt encapsulation or gluing.

[0010] In one embodiment, the areal density of the main body portion is 15 - 200 g / m 2 .

[0011] In one embodiment, the sound-absorbing material includes at least one of activated carbon, natural zeolite powder, porous silica, porous alumina, molecular sieve, MOF metal-organic framework material, COF covalent organic framework material, kaolin, diatomaceous earth, silica aerogel, and organic polymer aerogel.

[0012] In one embodiment, the particle size of the sound-absorbing material is greater than 0.1 μm.

[0013] In one embodiment, the volume of the sound-absorbing material occupies more than 75% of the internal volume of the housing.

[0014] The present utility model further provides a sounding device, including a sounding element, a housing, and an internal cavity surrounded by the housing and the sounding element, wherein the internal cavity is filled with the sound-absorbing component as described above.

[0015] In one embodiment, the housing includes a first housing and a second housing disposed opposite to each other, and the sound-absorbing component is sandwiched between the first housing and the second housing;

[0016] Alternatively, an adhesive layer is provided on the inner wall of the housing, and the adhesive layer is adhesively connected to the sound-absorbing component.

[0017] The present utility model further provides an electronic device, including the sounding device as described above.

[0018] The present utility model provides a sound absorption component, a sound generating device and an electronic device. The sound absorption component includes a housing and a sound absorption material filled in the housing. The housing includes a porous structure, the porosity of the housing is 30-90%, the thickness of the housing is 0.05-0.5 mm, the sound absorption material includes at least one of sound absorption particles and sound absorption raw powder, and the sound absorption particles include a plurality of sound absorption raw powders and an adhesive for bonding the plurality of sound absorption raw powders into one body. The housing has a packaging function, which can limit the sound absorption material in the housing to avoid powder pollution of the sound generating monomer caused by the collision and breakage of the sound absorption particles. The housing is a porous structure and has a certain sound absorption effect by itself. In addition, since the porosity of the housing is 30-90%, it can allow the flow of air in and out, and will not affect the adsorption and desorption rate of the sound absorption material to the gas in the rear cavity. Moreover, the thickness of the housing is only 0.05-0.5 mm, occupying a small volume of the rear cavity. Therefore, in the present utility model, the housing can not only solve the problem of collision and powder generation of the sound absorption particles, but also will not affect the sound absorption effect of the sound absorption material, and can improve the overall sound absorption effect of the sound absorption component, thereby improving the low-frequency acoustic performance of the sound generating device. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present drawings or related technologies, the following will briefly introduce the drawings required to be used in the description of the embodiments or related technologies. Obviously, the following drawings are only some embodiments of the present drawings. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0020] Figure 1 It is a cross-sectional view of an embodiment of the sound absorption component related to the present utility model;

[0021] Figure 2 It is a cross-sectional view of another embodiment of the sound absorption component related to the present utility model;

[0022] Figure 3 It is a cross-sectional view of another embodiment of the sound absorption component related to the present utility model using adhesive connection;

[0023] Figure 4 It is a cross-sectional view of an embodiment of the sound generating device related to the present utility model;

[0024] Figure 5 It is a cross-sectional view of another embodiment of the sound generating device related to the present utility model.

[0025] Description of the Reference Numerals:

[0026] 100, sound generating device; 110, sound generating monomer;

[0027] 120, outer shell; 121, first housing; 122, second housing;

[0028] 130. Sound absorption component; 131. Housing; 131a. Main body part; 131b. Cover part; 132. Sound absorption material; 133. Adhesive layer;

[0029] 140. Rear sound cavity.

[0030] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0031] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] An embodiment of the present utility model provides a sound absorption component 130. Figure 1 For a sectional view of a sound absorption component in an embodiment of the present utility model, refer to Figure 1 , the sound absorption component 130 includes a housing 131 and a sound absorption material 132 filled in the housing 131. The housing 131 has a porous structure. The porosity of the housing 131 is 30 - 90%, and the thickness of the housing 131 is 0.05 - 0.5 mm. The sound absorption material 132 includes at least one of sound absorption particles and sound absorption raw powder. The sound absorption particles include a plurality of sound absorption raw powders and an adhesive for bonding the plurality of sound absorption raw powders into one body. It can be understood that Figure 1 shows the case where the sound absorption material 132 is sound absorption raw powder, while the case where the sound absorption material 132 is sound absorption particles is shown in Figure 2 .

[0033] In this embodiment, the porosity of the housing 131 is 30 - 90%, for example, 30%, 40%, 50%, 60%, 70%, 80%, 90%, etc. The porosity can be tested by GB / T 42697 - 2023 (mass - density method). It can be understood that the smaller the porosity of the housing 131, the denser the arrangement of the fiber filaments in its porous structure, resulting in poor air permeability and being unfavorable for air flow to enter the sound absorption component 130; if the porosity is larger, the fiber filaments are arranged sparsely and the holes are larger, there is a risk of leakage of the sound absorption material 132. Controlling the porosity within the range of 30 - 90% can not only make the air flow smoothly in and out of the sound absorption component 130, but also prevent the leakage of the sound absorption material 132.

[0034] In this embodiment, the thickness of the housing 131 is 0.05 - 0.5 mm. For example, it can be 0.05 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc. It can be understood that when the thickness of the housing 131 is thin, its air permeability is good, but its mechanical properties are low, it is easy to be damaged, the stiffness is insufficient, it is easy to deform during the assembly process, and it is difficult to use; when the thickness of the housing 131 is too thick, the airflow entering the sound absorption component 130 is not smooth, which affects the performance of the sound absorption material 132 and further affects the acoustic effect, and it occupies the rear cavity space, which also affects the acoustic effect. Controlling the thickness of the housing 131 within the range of 0.05 - 0.5 mm can enable it to have sufficient mechanical properties, reduce the risk of damage, obtain good air permeability, and not affect the acoustic effect of the sound absorption material 132.

[0035] In some feasible embodiments, the housing 131 includes a main body portion 131a and a cover portion 131b. The main body portion 131a defines an accommodation space, and the sound absorption material 132 is filled in the accommodation space. The cover portion 131b is disposed on the main body portion 131a to seal the accommodation space. Among them, the main body portion 131a is a porous structure, and the cover portion 131b is a porous structure or a closed structure. It can be understood that the porous structure has a sound absorption function. The cover portion 131b can adopt the same porous structure as the main body portion 131a to enhance the overall sound absorption effect of the sound absorption component 130, or it can be a closed structure to provide good sealing performance.

[0036] In some feasible embodiments, the porous structure of the housing 131 is formed by stacking fiber filaments. The filament diameter of the fiber filaments is 0.2 - 30 μm. For example, it can be 0.2 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, etc. The fiber filaments have good flexibility, flexibly encapsulate the sound absorption particles, prevent hard collisions between the sound absorption particles and the housing 131 and cause powdering, and the porous structure has air permeability, which allows the gas in the rear cavity to enter and exit. Moreover, the porous structure also has a sound absorption function, which can enhance the overall sound absorption effect of the sound absorption component 130 while encapsulating the sound absorption material 132. It can be understood that the fiber filaments in the housing 131 are arranged in a disordered three-dimensional manner. If the diameter of the fiber filaments is relatively small, the specific surface area of the fiber filaments is relatively large, and it has a better adsorption effect on the fine particles of the sound absorption material 132, protecting the sound absorption material 132 from leaking; if the fiber filaments are too thick, the arrangement between the fiber filaments is not tight, and the holes formed by the stacking of the fiber filaments and the fiber filaments will be relatively large, and there is a risk of leakage of the sound absorption material 132. Controlling the filament diameter of the fiber filaments within the range of 0.2 - 30 μm can enable the housing 131 to effectively encapsulate the sound absorption material 132 and have a certain adsorption effect on the sound absorption material 132.

[0037] In some feasible embodiments, the softening point of the fiber filaments is greater than or equal to 100 °C. For example, 100 °C, 102 °C, 103 °C, 105 °C, 108 °C, 110 °C, etc. It can be understood that if the softening temperature of the fiber filaments is too low, the housing 131 is prone to deformation at low temperatures, with poor dimensional stability, certain changes in the pore size, and a risk of leakage of the sound-absorbing material 132 filled therein. Therefore, choosing the softening point of the fiber filaments to be greater than or equal to 100 °C helps the sound-absorbing component 130 to maintain its acoustic performance in a high-temperature working environment.

[0038] In some feasible embodiments, the main body portion 131a includes at least one of fiber fabric, non-woven fabric, hot-melt web, open-cell polymer foam material, open-cell foam metal, and open-cell foam ceramic. It can be understood that the above materials all have a porous structure. Using them to make the main body portion 131a can endow the main body portion 131a with a certain sound-absorbing function. The appropriate type of material can be selected according to the actual requirements for the structure and sound-absorbing ability of the main body portion 131a.

[0039] In some feasible embodiments, the cover portion 131b is double-sided tape, hot-melt adhesive, plastic film, foam metal, foam ceramic, or the same material as the main body portion 131a. The main body portion 131a and the cover portion 131b are connected by hot-melt encapsulation or gluing. It can be understood that the cover portion 131b covers the main body portion 131a to confine the sound-absorbing material 132 in the housing 131. The cover portion 131b can be made of materials with a certain bonding effect such as double-sided tape and hot-melt adhesive film, or it can also be made of plastic film, foam metal, foam ceramic, or the same material as the main body portion 131a. When the main body portion 131a and the cover portion 131b are made of the same material, the cover portion 131b also has the effect of improving the resonance frequency of the sound generating device 100 like the main body portion 131a. The connection method between the main body portion 131a and the cover portion 131b can be selected according to the materials of the two. For example, when the main body portion 131a and the cover portion 131b are made of the same material, hot-melt encapsulation is used. When the main body portion 131a and the cover portion 131b are made of different materials and the self-bonding effect between the two materials is insufficient, gluing connection is used. Figure 3 The cross-sectional view of the sound-absorbing component 130 using gluing connection is as Figure 3 shown. The sound-absorbing component 130 includes a housing 131 and a sound-absorbing material 132 filled in the housing 131. The housing 131 includes a main body portion 131a and a cover portion 131b. A glue layer 133 is provided between the main body portion 131a and the cover portion 131b to connect the main body portion 131a and the cover portion 131b.

[0040] In some feasible embodiments, the areal density of the main body portion 131a is 15 - 200 g / m 2 , for example, 15 g / m2 , 30 g / m 2 , 50 g / m 2 , 70 g / m 2 , 90 g / m 2 , 100 g / m 2 , 120 g / m 2 , 150 g / m 2 , 200 g / m 2 , etc. It can be understood that if the areal density of the main body part 131a is too small, the fiber filaments are arranged sparsely, resulting in too large a porosity, and the sound-absorbing material 132 is likely to leak out of the housing 131, affecting the acoustic performance; if the areal density is too large, more fiber filaments are stacked, the arrangement between the fiber filaments is tighter, and the number of connection points between the fiber filaments increases, which will make the air permeability of the main body part 131a poor, the air flow into the sound-absorbing component 130 is not smooth, affecting the performance of the sound-absorbing material 132 and further affecting the acoustic effect. Controlling the areal density of the main body part 131a within a suitable range can effectively encapsulate the sound-absorbing material 132 and ensure the smoothness of the air flow into the sound-absorbing component 130. The areal density of the main body part 131a can be further limited to 30 - 100 g / m 2 to obtain a main body part 131a with better air permeability and acoustic performance.

[0041] In some feasible embodiments, the sound-absorbing material 132 includes at least one of activated carbon, natural zeolite powder, porous silica, porous alumina, molecular sieve, MOF metal-organic framework material, COF covalent organic framework material, kaolin, diatomaceous earth, silica aerogel, and organic polymer aerogel. It can be understood that the above-mentioned types of materials all have a porous structure and can produce a sound-absorbing effect through the pore structure inside them. There are also differences in physical properties and other aspects between different materials. The appropriate sound-absorbing material 132 can be selected according to the actual considerations of factors such as sound-absorbing effect and filling difficulty to make the sound-absorbing component 130.

[0042] In some feasible embodiments, the particle size of the sound-absorbing material 132 is greater than 0.1 μm, for example, 1 μm, 3 μm, 5 μm, 10 μm, 12 μm, 15 μm, etc. It can be understood that if the particle size of the sound-absorbing material 132 is too small, the housing 131 needs a denser structure to form an encapsulation of the sound-absorbing material 132, and the denser housing 131 will affect the air inlet and outlet rate, resulting in a decline in acoustic performance. Controlling the particle size of the sound-absorbing material 132 to be greater than 0.1 μm, the housing 131 can effectively encapsulate the sound-absorbing material 132 and will not affect the air permeability effect of the housing 131. The particle size of the sound-absorbing material 132 can be further controlled to be greater than 10 μm to increase the number of pore structure units in the sound-absorbing material 132 per unit volume to provide better acoustic performance.

[0043] In some feasible embodiments, the volume of the sound-absorbing material 132 occupies more than 75% of the internal volume of the housing 131. For example, it can be 76%, 80%, 85%, 90%, 95%, 100%, etc. It can be understood that the housing 131 needs to occupy a certain volume in the rear cavity. The sound-absorbing material 132 is located in the accommodating space of the housing 131. When the proportion of the volume of the sound-absorbing material 132 in the volume of the accommodating space is less than 75%, the entire sound-absorbing component 130 occupies a certain volume but cannot provide an effective acoustic improvement effect. Therefore, the proportion of the volume of the sound-absorbing material 132 in the volume of the accommodating space is greater than 75%. In the case of occupying a certain volume, the filling quantity of the sound-absorbing material 132 is larger, the number of pore channels in the sound-absorbing material 132 is more, which is more conducive to the adsorption and desorption of the gas in the rear cavity and provides a better acoustic improvement effect.

[0044] In this embodiment, the housing 131 has an encapsulation function, which can limit the sound-absorbing material 132 within the housing 131 to avoid powder pollution caused by the collision and fragmentation of the sound-absorbing particles to the sounding element 110. The housing 131 is a porous structure and the housing 131 itself also has a certain sound-absorbing effect. In addition, the porosity of the housing 131 is 30 - 90%, which allows the air flow to enter and exit, and will not affect the adsorption and desorption rate of the gas in the rear cavity by the sound-absorbing material 132. Moreover, the thickness of the housing 131 is only 0.05 - 0.5 mm, and the volume occupied in the rear cavity is small. Therefore, in the present utility model, the housing 131 can not only solve the problem of the collision and fragmentation of the sound-absorbing particles, but also will not affect the sound-absorbing effect of the sound-absorbing material 132, and can improve the overall sound-absorbing effect of the sound-absorbing component 130, thereby improving the low-frequency acoustic performance of the sounding device 100.

[0045] The embodiment of the present utility model also provides a sounding device 100. Refer to Figure 4 , the sounding device 100 includes a sounding element 110, a housing 120 and an internal cavity surrounded by the housing 120 and the sounding element 110. The internal cavity is filled with the sound-absorbing component 130 as described above. The sounding element 110 divides the housing 120 into a front sound cavity and a rear sound cavity 140, and the sound-absorbing component 130 can be filled in the rear sound cavity 140.

[0046] Optionally, refer to Figure 5 , the housing 120 includes a first housing 121 and a second housing 122 arranged oppositely, and the sound-absorbing component 130 is clamped between the first housing 121 and the second housing 122; or, an adhesive layer is provided on the inner wall of the housing 120, and the adhesive layer is adhesively connected to the sound-absorbing component 130. Through the space limiting function of the first housing 121 and the second housing 122, the sound-absorbing component 130 is restricted in the cavity of the rear sound cavity 140 of the sounding device 100. Or the sound-absorbing component 130 can be attached to the inner wall of at least one side of the rear sound cavity 140 through the setting of an adhesive layer such as double-sided tape.

[0047] The sound generating device 100 provided by the present utility model solves the technical problem that the sound absorbing particles are easily broken, resulting in the pollution of the sound generating monomer 110. Compared with the prior art, the beneficial effects of the sound generating device 100 provided by the embodiment of the present utility model can refer to the beneficial effects of the sound absorbing component 130 in the above embodiment, which will not be elaborated here.

[0048] The embodiment of the present utility model also provides an electronic device, which includes the sound generating device 100 as described in the above embodiment.

[0049] In this embodiment, the electronic device includes a mobile phone, a laptop computer, a tablet computer, a VR (Virtual Reality) device, an AR (Augmented Reality) device, a TWS (True Wireless Stereo) headset, a smart speaker, a smart wearable device, etc.

[0050] Compared with the prior art, the beneficial effects of the electronic device provided by the embodiment of the present utility model are the same as those of the sound generating device 100 in the above embodiment, which will not be elaborated here.

[0051] The sound absorbing component of the present utility model will be described in detail below with specific embodiments and comparative examples. It should be understood that the following description is only exemplary and not a specific limitation of the present utility model.

[0052] Embodiment 1

[0053] Use a PET spunbonded fabric with a surface density of 60 g / m 2 , a thickness of 0.18 mm as the membrane material of the main body part 131a, with a porosity of 75%. The PET spunbonded fabric is hot-pressed into the main body part 131a with the required shape, and the volume is 0.34 ml. Use molecular sieve sound absorbing particles with a particle size of 200 - 400 μm (particles formed by bonding multiple molecular sieves with a particle size of 12 μm) as the sound absorbing material 132, and fill the sound absorbing material 132 into the formed main body part 131a, with a filling amount of 100%. Use a PP meltblown fabric as the membrane material of the cover part 131b. Cover the membrane material of the cover part 131b above the opening of the main body part 131a after filling the sound absorbing material 132, and use a hot melt process for sealing. After sealing, cut it to obtain a sound absorbing component 130 filled with molecular sieve sound absorbing particles, and install the sound absorbing component 130 into the rear cavity of the speaker to obtain an assembled speaker.

[0054] Embodiment 2

[0055] Use a PET spunbonded fabric with a surface density of 40 g / m 2, a PET spunbonded fabric with a thickness of 0.15 mm is used as the membrane material of the main body part 131a, and the porosity is 80%. The PET spunbonded fabric is thermally pressed into the main body part 131a with the required shape, and the volume is 0.34 ml. Molecular sieve sound-absorbing particles with a particle size of 200 - 400 μm (particles formed by bonding multiple molecular sieves with a particle size of 12 μm through an adhesive) are used as the sound-absorbing material 132, and the sound-absorbing material 132 is filled into the formed main body part 131a, and the filling amount is 100%. A PP meltblown fabric is used as the membrane material of the cover part 131b. The membrane material of the cover part 131b is covered above the opening of the main body part 131a after the sound-absorbing material 132 is filled, and a hot-melt process is used for sealing. After sealing, it is cut to obtain a sound-absorbing component 130 filled with molecular sieve sound-absorbing particles, and the sound-absorbing component 130 is installed in the rear cavity of the speaker to obtain a fully assembled speaker.

[0056] Comparative example

[0057] Molecular sieve sound-absorbing particles with a particle size of 200 - 400 μm (particles formed by bonding multiple molecular sieves with a particle size of 12 μm through an adhesive) are used as the sound-absorbing material 132, and 0.34 ml of the sound-absorbing material 132 is directly filled into the rear cavity of the speaker with a volume of 0.38 ml to obtain a fully assembled speaker.

[0058] It should be noted that the models and structural dimensions of the speakers in Examples 1 - 2 and the comparative example are the same.

[0059] Acoustic performance evaluation: IMP (Impedance) tests are carried out on the speakers assembled in Examples 1 - 2 and the comparative example, and the measured resonance frequency F0 results of each group of speakers are shown in Table 1 below.

[0060] Table 1

[0061] Number F0 (Hz) Whether there is powder dropping from the formed sound-absorbing component Example 1 750 None Example 2 745 None Comparative example 752 /

[0062] As can be seen from Table 1, the F0 of the loudspeaker in Example 1 is slightly better than that of the loudspeaker in the comparative example. The main reason is that the housing 131 is included in the loudspeaker of Example 1, and the housing 131 is a porous structure and also has a certain sound absorption function. The F0 of the loudspeaker in Example 2 is better than that of the loudspeaker in Example 1. The main reason is that the porosity of the outer housing 131 in the loudspeaker of Example 2 is higher than that in Example 1, and the areal density of the outer housing 131 in the loudspeaker of Example 2 is less than that in Example 1, which can provide higher air permeability and is conducive to the entry of gas into the sound absorption component 130, enabling the sound absorption material 132 to play a better role. After molding, there is no problem of powder falling in the sound absorption components of Example 1 and Example 2, indicating that the sound absorption component 130 of the present invention also has a good encapsulation effect and is not prone to powder falling problems. Therefore, the housing 131 in the sound absorption component 130 of the present invention can provide a certain sound absorption effect while having an encapsulation function and will not affect the acoustic performance of the sound absorption material 132.

[0063] Drop test evaluation: Assemble the loudspeakers of Examples 1-2 and the comparative example into a 200g drop tooling. The drop height of the drum drop test machine is 1m, the drum rotation frequency is 20 times / min, and the number of drops is 600 times. After the drop test, disassemble each group of loudspeakers and observe the powder falling situation of the sound absorption component 130. The test results are shown in Table 2 below.

[0064] Table 2

[0065] Example 1 The sound-absorbing component has no damage and no external powder leakage Example 2 The sound-absorbing component has no damage and no external powder leakage Comparative example There is a little fragmentation of the sound-absorbing particles and there is broken powder

[0066] As can be seen from the experimental results in Table 2, after the drop test, the sound absorption components 130 of Example 1 and Example 2 are intact, without damage or fine powder leakage. However, there is a little fragmentation of the sound absorption particles in the comparative example, and there is broken powder, which adheres to the surface of the rear cavity housing and the monomer. This is because the sound absorption components 130 of Example 1 and Example 2 include a housing 131, and the porous structure of the housing 131 is formed by stacking fiber filaments. The fiber filaments have good flexibility and can effectively flexibly encapsulate the sound absorption material 132. It can not only prevent the sound absorption material 132 from entering the loudspeaker monomer, but also buffer the impact between the sound absorption materials 132 and between the sound absorption material 132 and the main body part 131a to the greatest extent, thereby preventing the occurrence of broken powder. Therefore, the sound absorption component 130 of the present invention can solve the problem of pollution of the sounding monomer caused by the fragmentation and powder falling of the sound absorption particles, and avoid the deterioration of the low-frequency performance due to the pollution of the sounding monomer.

[0067] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A sound-absorbing component, characterized in that, It includes a housing and sound-absorbing material filled in the housing. The housing includes a porous structure, the porosity of the housing is 30 - 90%, the thickness of the housing is 0.05 - 0.5 mm, the sound-absorbing material includes at least one of sound-absorbing particles and sound-absorbing raw powder, and the sound-absorbing particles include a plurality of sound-absorbing raw powders and an adhesive for bonding the plurality of sound-absorbing raw powders into one body.

2. The sound-absorbing component according to claim 1, wherein, The housing includes a main body portion and a cover portion. The main body portion defines an accommodation space, the sound-absorbing material is filled in the accommodation space, and the cover portion is covered on the main body portion to seal the accommodation space. Among them, the main body portion is a porous structure, and the cover portion is a porous structure or a closed structure.

3. The sound absorption component according to claim 2, wherein, The porous structure is formed by stacking fiber filaments, and the filament diameter of the fiber filaments is 0.2 - 30 μm; and / or, the softening point of the fiber filaments is greater than or equal to 100 °C.

4. The sound-absorbing component according to claim 2, wherein The main body portion includes at least one of fiber fabric, non-woven fabric, hot-melt web, open-cell polymer foam material, open-cell foam metal, and open-cell foam ceramic.

5. The sound absorption component according to claim 2, characterized in that The cover portion is double-sided tape, hot-melt adhesive, plastic film, foam metal, foam ceramic, or the same material as the main body portion, and the main body portion and the cover portion are connected by hot-melt encapsulation or gluing.

6. The sound-absorbing component according to claim 2, wherein The areal density of the main body is 15-200 g / m 2 .

7. The sound-absorbing component according to claim 1, characterized in that The sound-absorbing material includes at least one of activated carbon, natural zeolite powder, porous silica, porous alumina, molecular sieve, MOF metal-organic framework material, COF covalent organic framework material, kaolin, diatomite, silica aerogel, and organic polymer aerogel.

8. The sound-absorbing component according to claim 1, wherein, The particle size of the sound-absorbing material is greater than 0.1 μm.

9. The sound absorption component according to claim 1, wherein, The volume of the sound-absorbing material occupies more than 75% of the internal volume of the housing.

10. A sound generating device, characterized in that, It includes a sounding monomer, a housing, and an internal cavity surrounded by the housing and the sounding monomer. The internal cavity is filled with the sound-absorbing component according to any one of claims 1 to 9.

11. The sound generating device according to claim 10, wherein The housing includes a first housing and a second housing arranged oppositely, and the sound-absorbing component is clamped between the first housing and the second housing; Or, an adhesive layer is provided on the inner wall of the housing, and the adhesive layer is adhesively connected to the sound-absorbing component.

12. An electronic device, characterized in that, It includes the sounding device according to claim 10 or 11.

Images