Sound absorption assembly, sound production device and electronic equipment

Abstract

The invention discloses a sound absorption assembly, a sound production device and electronic equipment, and relates to the acoustics field, the sound absorption assembly comprises a shell and a sound absorption material filled in the shell, the shell comprises a main body part and a sealing cover part, the main body part defines a containing space, the sound absorption material is filled in the containing space, and the sealing cover part is arranged in the containing space. The sound absorbing material comprises at least one of sound absorbing particles and sound absorbing raw powder, 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, the main body part forms a porous structure formed by stacking cellosilk, the breaking strength of the main body part is 10N-80N, and the elongation at break of the main body part is 1-60%. According to the sound-absorbing assembly, the sound-absorbing material is effectively packaged through the shell, the main body part has good breaking strength and breaking elongation and is not prone to damage, the problem that the sound-absorbing material is exposed to cause crushed powder pollution is solved, and the sound-absorbing assembly has good acoustic improvement performance.

Description

Technical Field

[0001] The present invention relates to the field of acoustics, and in particular to a sound absorbing component, a sound generating device and an electronic device. Background Art

[0002] In recent years, with the trend of electronic products becoming increasingly thin and light, the space left for speakers is getting smaller and smaller. With the flattening of micro speaker modules, the volume of the acoustic back cavity is reduced. In order to solve the problem of reduced low-frequency performance of the speaker caused by reduced space, sound-absorbing particles made of porous materials can be filled into the back cavity, and the special physical channel structure inside the porous material can be used to quickly adsorb and desorb the gas in the back cavity, so as to achieve the virtual enlargement effect of the resonance space of the speaker's acoustic back cavity, thereby effectively reducing the speaker's resonance frequency F0 and improving low-frequency sensitivity.

[0003] Existing speakers are filled with sound-absorbing particles in the back cavity. During operation, friction and collision occur between the particles, which easily cause the problem of breakage and powder falling, and eventually the broken dust enters the sound unit, causing abnormal operation, increasing F0 and poor low-frequency effect. Summary of the invention

[0004] The main purpose of the present invention is to provide a sound absorbing component, a sound-generating device and an electronic device, aiming to solve the technical problem that the sound absorbing particles filled in the back cavity of the existing speaker are prone to breakage and powdering, resulting in contamination of the sound-generating unit and poor low-frequency performance.

[0005] To achieve the above-mentioned object, the present invention provides a sound-absorbing component, comprising a shell and a sound-absorbing material filled in the shell, the shell comprising a main body and a cover, the main body defining a containing space, the sound-absorbing material filling the containing space, the sound-absorbing material comprising at least one of sound-absorbing particles and sound-absorbing raw powder, the sound-absorbing particles comprising a plurality of sound-absorbing raw powders and an adhesive for bonding the plurality of sound-absorbing raw powders into one, the main body being formed into a porous structure formed by stacking fiber filaments, the breaking strength of the main body being 10N-80N, and the breaking elongation of the main body being 1-60%.

[0006] In one embodiment, the material of the main body includes at least one of polypropylene, polyester, nylon, spandex, acrylic, viscose, polyethylene, and chloroprene.

[0007] In one embodiment, the thickness of the shell is 0.05-0.5 mm.

[0008] In one embodiment, the surface density of the main body is 20-100 g / m 2 .

[0009] In one embodiment, the porosity of the main body is 30-90%.

[0010] In one embodiment, the fiber diameter of the main body is 0.2-30 μm;

[0011] And / or, the softening point of the fiber filaments in the main body is greater than or equal to 100°C.

[0012] In one embodiment, the sound absorbing material includes at least one of activated carbon, zeolite powder, silica, porous alumina, molecular sieve, metal-organic framework material, aerogel, and COF.

[0013] In one embodiment, the particle size of the sound absorbing material is greater than 0.1 μm.

[0014] In one embodiment, the sealing portion is made of double-sided adhesive, hot-melt adhesive film, plastic film or the same material as the main body.

[0015] In one embodiment, the main body and the cover are connected by hot-melt sealing or gluing.

[0016] The present invention further provides a sound-generating device, comprising a sound-generating unit, a shell, and an internal cavity surrounded by the shell and the sound-generating unit, wherein the internal cavity is filled with the sound-absorbing component described above.

[0017] In one embodiment, the housing comprises a first shell and a second shell arranged opposite to each other, and the sound absorbing assembly is sandwiched between the first shell and the second shell;

[0018] Alternatively, an adhesive layer is provided on the inner wall of the shell, and the adhesive layer is adhesively connected to the sound absorbing component.

[0019] The present invention also provides an electronic device, comprising the sound generating device as described above.

[0020] The present invention provides a sound-absorbing component, a sound-generating device and an electronic device. The sound-absorbing component comprises a shell and a sound-absorbing material filled in the shell. The shell comprises a main body and a cover. The main body defines a storage space. The sound-absorbing material is filled in the storage space. The sound-absorbing material comprises at least one of sound-absorbing particles and sound-absorbing raw powder. The sound-absorbing particles comprise a plurality of sound-absorbing raw powders and an adhesive for bonding the plurality of sound-absorbing raw powders into one. The main body is formed into a porous structure formed by stacking fiber filaments. The breaking strength of the main body is 10N-80N, and the breaking elongation of the main body is 1-60%. The sound-absorbing material can provide a good sound-absorbing effect. The main body with a porous structure has pores that allow airflow to enter and exit, and can also provide a certain sound-absorbing effect, so as to improve the overall sound-absorbing effect of the sound-absorbing component. The breaking strength of the main body is in the range of 10N-80N. When subjected to the force generated by the airflow and the sound-absorbing material, the main body will not be stretched too much, thereby preventing the sound-absorbing material from leaking out. The breaking elongation of the main body is 1-60%, and it is not easy to break during the molding process, thereby ensuring the mechanical properties of the main body after molding. Therefore, the main body of the sound-absorbing component of the present invention has good mechanical properties, can effectively encapsulate the sound-absorbing material, and avoid the problem of poor low-frequency performance caused by the collision of sound-absorbing particles and the pollution of sound-emitting monomers. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present drawings or related technologies, the drawings required for use in the embodiments or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 A cross-sectional view of an embodiment of a sound absorbing assembly according to the present invention;

[0023] Figure 2 A cross-sectional view of another embodiment of the sound absorbing assembly according to the present invention, which is connected by adhesive bonding;

[0024] Figure 3 It is a cross-sectional view of an embodiment of the sound-generating device according to the present invention;

[0025] Figure 4 It is a cross-sectional view of another embodiment of the sound-generating device according to the present invention.

[0026] Description of reference numerals:

[0027] 100. sound generating device; 110. sound generating unit;

[0028] 120, housing; 121, first housing; 122, second housing;

[0029] 130, sound absorbing component; 131, shell; 131a, main body; 131b, cover; 132, sound absorbing material; 133, adhesive layer;

[0030] 140. Posterior vocal cavity.

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0033] The embodiment of the present invention provides a sound absorbing assembly 130, Figure 1 This is a cross-sectional view of a sound absorbing component according to an embodiment of the present invention, referring to Figure 1 The sound-absorbing component 130 includes a shell 131 and a sound-absorbing material 132 filled in the shell 131. The shell 131 includes a main body 131a and a cover 131b. The main body 131a defines a receiving space. The sound-absorbing material 132 is filled in the receiving space. The sound-absorbing material 132 includes at least one of sound-absorbing particles and sound-absorbing raw powder. The sound-absorbing particles include a plurality of sound-absorbing raw powders and an adhesive that bonds the plurality of sound-absorbing raw powders into one. The main body 131a is formed into a porous structure formed by stacking fiber filaments. The breaking strength of the main body 131a is 10N-80N, and the breaking elongation of the main body 131a is 1-60%.

[0034] In this embodiment, the main body 131a is formed into a porous structure formed by stacking fiber filaments. The fiber filaments have good flexibility and can flexibly encapsulate the sound-absorbing particles to prevent the sound-absorbing particles from being crushed into powder due to hard collision with the main body. The main body 131a of the porous structure is air-permeable and can allow the gas in the back cavity to enter and exit. The porous structure also has a sound-absorbing function and can improve the overall sound-absorbing effect of the sound-absorbing assembly 130 while encapsulating the sound-absorbing material 132.

[0035] The breaking strength of the main body 131a of this embodiment is 10N-80N, for example, 10N, 20N, 30N, 50N, 70N, 80N, etc. The breaking elongation of the main body 131a of this embodiment is 1-60%, for example, 1%, 5%, 10%, 20%, 30%, 40%, 50%, 55%, 60%, etc. The breaking strength and breaking elongation are used to characterize the tensile strength of the main body 131a, and both can be tested using the GB / T3923.1-2013 standard. It can be understood that the tighter the entanglement between the fiber filaments, the larger the thermal bonding points of the fiber filaments, and the increased cohesive force generated between the fiber filaments, which will make the breaking strength of the main body 131a greater. If the breaking strength and breaking elongation are too small, the cohesion between the fiber filaments is small, and it is easy to break during the molding process; the porous structure membrane material with larger breaking strength and breaking elongation will also have a larger thickness, surface density and wire diameter, and the main body 131a after molding will be denser, resulting in poor air permeability. The breaking strength within the range of 10N-80N can avoid the problem of increased spacing between fiber filaments due to excessive stretching during the molding process, and reduce the risk of leakage of the sound-absorbing material 132. The breaking elongation within the range of 1-60% can meet the stretching requirements during the molding process of the main body 131a, making it difficult to be pulled apart during the molding process.

[0036] In some feasible embodiments, the material of the main body 131a includes at least one of polypropylene, polyester, nylon, spandex, acrylic, viscose, vinyl, and chloroprene. It is understandable that each of the above materials has different characteristics. Polypropylene is light and has abundant raw material sources. Polyester is durable and not easy to wrinkle. Nylon has certain elasticity and wear resistance. Spandex has excellent elasticity. Acrylic is relatively soft. Viscose is not easy to generate static electricity. One or more materials can be selected to make the main body 131a according to the various performance requirements of the main body 131a in actual applications.

[0037] In some feasible embodiments, the thickness of the shell 131 is 0.05-0.5 mm, for example, 0.05 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc. It is understandable that the thickness of the main body 131a and the cover 131b are both within the thickness range of 0.05-0.5 mm, and the thickness of the main body 131a and the cover 131b can be the same or different. The shell 131 is thin and has good air permeability, but has low mechanical properties, is easy to break, has insufficient stiffness, is easy to deform during assembly, and cannot meet the use requirements; if the shell 131 is too thick, the airflow entering the sound absorbing component 130 is not smooth, affecting the function of the sound absorbing material 132, further affecting the acoustic effect, and occupying the back cavity space will also affect the acoustic effect. By controlling the thickness of the shell 131 within the range of 0.05-0.5 mm, it can have sufficient mechanical properties, reduce the risk of damage, and obtain good air permeability without affecting the acoustic effect of the sound-absorbing material 132.

[0038] In some feasible embodiments, the surface density of the main body 131a is 20-100 g / m 2 , for example, 20g / m 2 , 30g / m 2 , 50g / m 2 , 70g / m 2 , 90g / m 2 , 100g / m 2 etc. It is understandable that if the surface density of the main body 131a is too small, the fiber filaments are sparsely arranged, resulting in too large a porosity, and the sound-absorbing material 132 is easy to leak out of the shell 131, affecting the acoustic performance; if the surface density is too large, the fiber filaments are more piled up, the fiber filaments are arranged more closely, and the connection points between the fiber filaments increase, which will make the air permeability of the main body 131a poor, and the airflow entering the sound-absorbing component 130 is not smooth, which affects the role of the sound-absorbing material 132 and further affects the acoustic effect. Controlling the surface density of the main body 131a within an appropriate range can effectively encapsulate the sound-absorbing material 132 and ensure the smoothness of the airflow entering the sound-absorbing component 130.

[0039] In some feasible embodiments, the porosity of the main body 131a is 30-90%, for example, 30%, 40%, 50%, 60%, 70%, 80%, 90%, etc. The porosity can be tested using GB / T 42697-2023 (mass-density method). It is understandable that the smaller the porosity of the main body 131a, the denser the arrangement of the fiber filaments in its porous structure, resulting in poor air permeability, which is not conducive to the airflow entering the sound-absorbing component 130; if the porosity is large, the fiber filaments are sparsely arranged, the holes are large, and there is a risk of leakage of the sound-absorbing material 132, resulting in poor packaging effect. Controlling the porosity within the range of 30-90% can not only allow the airflow to enter and exit the sound-absorbing component 130 smoothly, but also prevent the leakage of the sound-absorbing material 132, thereby achieving good packaging and ventilation effects.

[0040] In some feasible embodiments, the fiber diameter of the main body 131a is 0.2-30 μm, for example, 0.2 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, etc. It can be understood that the fiber filaments in the main body 131a are arranged in a disordered three-dimensional manner, and the diameter of the fiber filaments is relatively small, so the specific surface area of ​​the fiber filaments is large, and the fine particles of the sound-absorbing material 132 are better adsorbed, and the sound-absorbing material 132 is protected from leakage; if the fiber filaments are too thick, the fiber filaments are not arranged tightly, and the three-dimensional structure holes formed by the stacking of the fiber filaments will be relatively large, and the sound-absorbing material 132 has the risk of leakage, and the packaging effect is deteriorated. Controlling the fiber diameter within the range of 0.2-30 μm can make the main body 131a effectively encapsulate the sound-absorbing material 132, and have a certain adsorption effect on the sound-absorbing material 132.

[0041] In some feasible embodiments, the softening point of the fiber filaments of the main body 131a is greater than or equal to 100°C, for example, 100°C, 102°C, 103°C, 105°C, 108°C, 110°C, etc. It is understandable that if the softening temperature of the fiber filaments is too low, the main body 131a is easily deformed at low temperatures, the dimensional stability is poor, the pore size changes to a certain extent, the sound absorbing material 132 filled therein has the risk of leakage, and the packaging effect will be deteriorated. Therefore, selecting the softening point of the fiber filaments to be greater than or equal to 100°C helps the sound absorbing component 130 maintain the acoustic performance in a high temperature working environment.

[0042] The sound-absorbing material 132 of this embodiment includes at least one of sound-absorbing particles and sound-absorbing raw powders, and the sound-absorbing particles include a plurality of sound-absorbing raw powders and an adhesive that bonds the plurality of sound-absorbing raw powders into one. It can be understood that both the sound-absorbing particles and the sound-absorbing raw powders have a sound-absorbing effect, and the adhesive can bond the plurality of sound-absorbing raw powders into sound-absorbing particles. The size of the sound-absorbing raw powder is smaller than that of the sound-absorbing particles, and a smaller gap space is generated after filling. The sound-absorbing particles can be spherical, such as a solid sphere, or a sphere with a concave hole, which can form a channel for air circulation and communicate with the external space to achieve a better sound absorption effect. The sound-absorbing particles and the sound-absorbing raw powder can be mixed and used, and the volume of the rear cavity can be fully utilized by matching different particle sizes.

[0043] In some feasible embodiments, the sound absorbing material 132 includes at least one of activated carbon, zeolite powder, silicon dioxide, porous alumina, molecular sieve, metal-organic framework material, aerogel, and COF. COF is a covalent-organic framework material. It is understandable that the above-mentioned types of materials all have a porous structure, and the sound absorption effect is generated through the pore structure inside them. Different materials also have differences in physical properties and other aspects. The sound absorbing component 130 can be made by selecting a suitable sound absorbing material 132 based on actual considerations of sound absorption effect, filling difficulty and other factors.

[0044] 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 is understandable that if the particle size of the sound absorbing material 132 is too small, the shell 131 needs a denser structure to encapsulate the sound absorbing material 132, and a denser shell 131 will affect the air inlet and outlet rate, resulting in a decrease in acoustic performance. If the particle size of the sound absorbing material 132 is controlled to be greater than 0.1 μm, the shell 131 can effectively encapsulate the sound absorbing material 132 without affecting the ventilation effect of the main body 131a.

[0045] In some feasible embodiments, the cover portion 131b is a double-sided adhesive, a hot melt adhesive film, a plastic film, or the same material as the main body 131a. It is understandable that the cover portion 131b is covered on the main body 131a to confine the molecular sieve 132 in the shell 131. The cover portion 131b is made of a material with a certain bonding effect such as a double-sided adhesive, a hot melt adhesive film, or a plastic film or the same material as the main body 131a. When the main body 131a and the cover portion 131b are made of the same material, the cover portion 131b also has the same function of improving the resonant frequency of the speaker as the main body 131a.

[0046] In some feasible embodiments, the main body 131a and the cover 131b are connected by hot-melt packaging or gluing. It is understandable that the connection method between the main body 131a and the cover 131b can be selected according to the materials of the two. For example, when the main body 131a and the cover 131b are made of the same material, hot-melt packaging is used. When the main body 131a and the cover 131b are made of different materials and the bonding effect between the two materials is insufficient, gluing is used. Figure 2 FIG. 1 is a cross-sectional view of a sound absorbing assembly 130 connected by adhesive bonding, as shown in FIG. Figure 2 As shown, the sound absorbing assembly 130 includes a shell 131 and a sound absorbing material 132 filled in the shell 131. The shell 131 includes a main body 131a and a cover 131b. An adhesive layer 133 is provided between the main body 131a and the cover 131b to connect the main body 131a and the cover 131b.

[0047] In the present embodiment, the sound-absorbing material 132 can provide a good sound-absorbing effect. The main body 131a has a porous structure, and the pores therein allow airflow to enter and exit, and can also provide a certain sound-absorbing effect, so as to enhance the overall sound-absorbing effect of the sound-absorbing component 130. The breaking strength of the main body 131a is in the range of 10N-80N. When subjected to the force generated by the airflow and the sound-absorbing material 132, the main body 131a can avoid excessive stretching, thereby preventing the sound-absorbing material 132 from leaking out. The breaking elongation of the main body 131a is 1-60%, and the main body 131a is not prone to breakage during the molding process, thereby ensuring the mechanical properties of the main body 131a after molding. Therefore, the main body 131a of the sound-absorbing component 130 of the present invention has good mechanical properties, can effectively encapsulate the sound-absorbing material 132, and prevent the sound-absorbing particles from colliding with each other and crushing into powder to pollute the sound-emitting monomer 110, thereby causing the problem of poor low-frequency performance.

[0048] The embodiment of the present invention further provides a sound generating device 100, referring to Figure 3 The sound device 100 includes a sound unit 110, a housing 120, and an internal cavity surrounded by the housing 120 and the sound unit 110, and the internal cavity is filled with the above-mentioned sound absorbing component 130. The sound unit 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.

[0049] Optionally, refer to Figure 4The housing 120 includes a first housing 121 and a second housing 122 that are arranged opposite to each other, and the sound absorbing component 130 is sandwiched 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 bonded and connected to the sound absorbing component 130. Through the spatial limiting effect of the first housing 121 and the second housing 122, the sound absorbing component 130 is confined in the cavity of the rear sound cavity 140 of the sound-generating device 100. Alternatively, the sound absorbing component 130 can be attached to the inner wall of at least one side of the rear sound cavity 140 by setting an adhesive layer such as a double-sided adhesive.

[0050] The sound-generating device 100 provided by the present invention solves the technical problem that the sound-absorbing particles are easily broken, resulting in contamination of the sound-generating unit 110. Compared with the prior art, the beneficial effects of the sound-generating device 100 provided by the embodiment of the present invention can refer to the beneficial effects of the sound-absorbing assembly 130 of the above embodiment, and will not be repeated here.

[0051] An embodiment of the present invention further provides an electronic device, which includes the sound-generating device 100 as described in the above embodiment.

[0052] In this embodiment, the electronic devices include mobile phones, laptop computers, tablet computers, VR (Virtual Reality) devices, AR (Augmented Reality) devices, TWS (True Wireless Stereo) headphones, smart speakers, smart wearable devices, etc.

[0053] Compared with the prior art, the beneficial effects of the electronic device provided by the embodiment of the present invention are the same as the beneficial effects of the sound-generating device 100 of the above embodiment, which will not be elaborated herein.

[0054] The sound absorbing assembly of the present invention is described in detail below with specific embodiments and comparative examples. It is worth noting that the following description is only exemplary and not a specific limitation of the present invention.

[0055] Example 1

[0056] The surface density is 45g / m 2 , PP meltblown cloth with a thickness of 0.15mm is used as the main body 131a film material, with a breaking strength of 20N and a breaking elongation of 28%. The main body 131a film material is hot-pressed to obtain the main body 131a of the required shape, with a volume of 0.3ml. Molecular sieve with a particle size of 11μm is used as the sound-absorbing material 132, and the sound-absorbing material 132 is filled into the molded main body 131a, with a filling amount of 100%. The surface density is 25g / m 2The PP meltblown cloth is used as the film material of the cover part 131b. The cover part 131b film material is placed on the opening of the main body 131a after the sound absorbing material 132 is filled, and the opening is sealed by a hot melt process. After sealing, the sound absorbing component 130 filled with 11μm molecular sieve is cut to obtain the sound absorbing component 130, and the sound absorbing component 130 is installed in the rear cavity of the speaker to obtain the assembled speaker.

[0057] Example 2

[0058] The surface density is 35g / m 2 , PP / PET blended melt-blown cloth with a thickness of 0.1mm is used as the film material of the main body 131a, with a breaking strength of 48N and a breaking elongation of 25%. The main body 131a film material is hot-pressed to obtain the main body 131a of the required shape, with a volume of 0.3ml. Molecular sieve sound-absorbing particles with an average particle size of 250-350μm (particles formed by bonding multiple molecular sieves with a particle size of 11μm through an adhesive) are used as the sound-absorbing material 132, and the sound-absorbing material 132 is filled into the molded main body 131a, with a filling amount of 0.26ml. The surface density is 25g / m 2 The PP melt-blown cloth is used as the film material of the cover part 131b. The cover part 131b film material is placed on the opening of the main body 131a after the sound-absorbing material 132 is filled, and the opening is sealed by a hot melt process. After sealing, the sound-absorbing component 130 filled with molecular sieve sound-absorbing particles is cut to obtain the sound-absorbing component 130, and the sound-absorbing component 130 is installed in the rear cavity of the speaker to obtain an assembled speaker.

[0059] Comparative Example

[0060] Molecular sieve sound-absorbing particles with an average particle size of 250-350 μm (particles formed by bonding multiple molecular sieves with a particle size of 11 μm by an adhesive) are used as the sound-absorbing material 132, and 0.26 ml of the molecular sieve sound-absorbing particles are directly filled into the rear cavity of the speaker with a volume of 0.32 ml to obtain an assembled speaker.

[0061] It should be noted that the models and structural dimensions of the speakers in Examples 1-2 and the comparative example are consistent.

[0062] Acoustic performance evaluation: The loudspeakers assembled in Examples 1-2 and the comparative example were subjected to IMP (Impedance) tests, and the resonant frequency F0 of each group of loudspeakers was measured and the results are shown in Table 1 below.

[0063] Table 1

[0064] serial number F0(Hz) Check if the sound absorbing components have any powder falling off Example 1 793 none Example 2 828 none Comparative Example 832 /

[0065] The F0 of the speaker of Example 1 is better than that of the comparative speaker, mainly because the particle size of the sound-absorbing material 132 in Example 1 is smaller, and the amount of the sound-absorbing material 132 contained in the speaker of Example 1 per unit volume is higher than the amount of the sound-absorbing particles filled in the comparative speaker, indicating that the present invention can effectively fill the volume of the speaker back cavity and reduce the resonance frequency. The F0 of the speaker of Example 2 is slightly better than that of the comparative speaker, mainly because the sound-absorbing component 130 of the speaker of Example 2 includes a shell 131, and the main body 131a and the cover part 131b of the shell 131 both have a porous structure and also have a certain sound-absorbing function. The suitable surface density and high tensile strength of both Examples 1 and 2 are conducive to molding. After molding, the sound-absorbing component 130 also has a good packaging effect and is not prone to powder falling problems. Therefore, the shell 131 in the sound-absorbing component 130 of the present invention can provide a certain sound-absorbing effect while having a packaging function, and will not affect the acoustic performance of the sound-absorbing material 132.

[0066] Drop test evaluation: The speakers of Examples 1-2 and the comparative example were assembled in a 200g drop fixture, and the drop height of the drum drop tester was 1m, the drum rotation frequency was 20 times / min, and the number of drops was 600 times. After the drop test, each group of speakers was disassembled to observe the powder falling of the sound absorbing component 130. The test results are shown in Table 2 below.

[0067] Table 2

[0068] Example 1 The sound-absorbing components are not damaged and there is no powder leakage Example 2 The sound-absorbing components are not damaged and there is no powder leakage Comparative Example The sound-absorbing particles are slightly broken and there is powder

[0069] It can be seen from the experimental results in Table 2 that after the drop test, the sound-absorbing components 130 of Examples 1 and 2 are intact, without damage or leakage of fine powder, while the sound-absorbing particles directly filled in the control example are slightly broken, and powder appears, which adheres to the rear cavity shell and the surface of the unit. This is because the sound-absorbing components 130 of Examples 1 and 2 include a shell 131, and the main body 131a of the shell 131 is formed by stacking fiber filaments. The fiber filaments have good flexibility and can effectively flexibly encapsulate the sound-absorbing material 132, which can not only prevent the sound-absorbing material 132 from entering the speaker unit, but also can maximize the buffering of the impact between the sound-absorbing material 132 and the sound-absorbing material 132 and the sound-absorbing material 132 and the main body 131a, thereby preventing the occurrence of powder. It shows that the shell 131 of the sound-absorbing component 130 prepared by the present invention can prevent the sound-absorbing material 132 from entering the speaker unit, and can also ensure good air permeability, so that the sound-absorbing material 132 can better play its role.

[0070] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sound absorbing component, characterized in that: The invention comprises a shell and a sound-absorbing material filled in the shell, wherein the shell comprises a main body and a cover, the main body defines a storage space, the sound-absorbing material is filled in the storage space, the sound-absorbing material comprises at least one of sound-absorbing particles and sound-absorbing raw powder, the sound-absorbing particles comprise a plurality of sound-absorbing raw powders and an adhesive for bonding the plurality of sound-absorbing raw powders into one, the main body is formed into a porous structure formed by stacking fiber filaments, the breaking strength of the main body is 10N-80N, and the breaking elongation of the main body is 1-60%.

2. The sound absorbing assembly according to claim 1, characterized in that The material of the main body includes at least one of polypropylene, polyester, nylon, spandex, acrylic, viscose, polyethylene, and chloroprene.

3. The sound absorbing assembly according to claim 1, characterized in that: The thickness of the shell is 0.05-0.5 mm.

4. The sound absorbing assembly according to claim 1, characterized in that The surface density of the main body is 20-100 g / m 2 .

5. The sound absorbing assembly according to claim 1, characterized in that: The porosity of the main body is 30-90%.

6. The sound absorbing assembly according to claim 1, characterized in that: The fiber diameter of the main body is 0.2-30 μm; And / or, the softening point of the fiber filaments in the main body is greater than or equal to 100°C.

7. The sound absorbing assembly according to claim 1, characterized in that The sound absorbing material includes at least one of activated carbon, zeolite powder, silicon dioxide, porous alumina, molecular sieve, metal-organic framework material, aerogel, and COF.

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

9. The sound absorbing assembly according to claim 1, characterized in that: The sealing portion is made of double-sided adhesive, hot-melt adhesive film, plastic film or the same material as the main body.

10. The sound absorbing assembly according to claim 1, wherein: The main body and the cover are connected by hot-melt sealing or gluing.

11. A sound-generating device, characterized in that: The invention comprises a sound-emitting unit, a shell, and an internal cavity surrounded by the shell and the sound-emitting unit, wherein the internal cavity is filled with the sound-absorbing component according to any one of claims 1 to 10.

12. The sound generating device according to claim 11, characterized in that: The housing comprises a first shell and a second shell which are arranged opposite to each other, and the sound absorbing assembly is sandwiched between the first shell and the second shell; Alternatively, an adhesive layer is provided on the inner wall of the shell, and the adhesive layer is adhesively connected to the sound absorbing component.

13. An electronic device, characterized in that: Comprising a sound-generating device as claimed in claim 11 or 12.

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