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 a bonding agent for bonding the plurality of sound-absorbing raw powder into a whole, the sealing cover part covers the main body part to seal the accommodating space, the main body part is of a porous structure formed by stacking cellosilk, the porosity of the main body part is 40-90%, and the sound-absorbing raw powder is arranged in the main body part. And the bursting strength of the main body part is greater than 5N. The main body part of the sound absorption assembly has proper porosity, is good in air permeability and can effectively package the sound absorption material, the bursting strength is larger than 5 N, the structural firmness is good, and the situation of breakage is not prone to occurring.

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 speakers, the volume of the acoustic back cavity is reduced. In order to solve the problem of reduced low-frequency performance of speakers due to reduced space, sound-absorbing particles made of porous materials can be filled into the back cavity. The special physical pore structure inside the porous material can be used to quickly adsorb and desorb the gas in the back cavity, so as to achieve a virtual increase in the resonance space of the acoustic back cavity of the speaker, thereby effectively reducing the resonance frequency F0 of the speaker and improving the low-frequency sensitivity.

[0003] Existing speakers are filled with sound-absorbing particles in the back cavity. When the speaker is working, the airflow will exert force on the sound-absorbing particles. The friction and collision between the particles are likely to cause breakage and powder falling. The broken dust enters the sound unit and causes abnormal operation, which increases 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-emitting device and an electronic device, aiming to solve the technical problem that the sound-absorbing particles filled in the rear cavity of the existing speaker are easily broken and shed under the action of airflow, resulting in contamination of the sound-emitting 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 part, the main body defines a containing space, the sound-absorbing material is filled 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 powders and an adhesive for bonding the plurality of sound-absorbing raw powders into one, the cover part is covered on the main body to seal the containing space, wherein the main body is formed into a porous structure formed by stacking fiber filaments, the porosity of the main body is 40-90%, and the bursting strength of the main body is greater than 5N.

[0006] In one embodiment, 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 15-100 g / m 2 .

[0009] In one embodiment, the fiber filaments of the main body have a diameter of 0.2-30 μm; and / or the fiber filaments of the main body have a softening point greater than or equal to 100°C.

[0010] In one embodiment, the breaking strength of the main body is 1-80N; and / or the breaking elongation of the main body is 1-60%.

[0011] In one embodiment, the bursting strength of the main body is less than 50N.

[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, covalent-organic framework material; and / or the particle size of the sound absorbing material is greater than 0.1 μm.

[0013] 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.

[0014] In one embodiment, the main body and the cover are connected by hot-melt sealing or gluing.

[0015] 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.

[0016] 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;

[0017] 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.

[0018] The present invention also provides an electronic device, comprising the sound generating device as described above.

[0019] 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 cover is covered on the main body to seal the storage space. The main body is formed into a porous structure formed by stacking fiber filaments. The porosity of the main body is 40-90%. The bursting strength of the main body is greater than 5N. The sound-absorbing material includes at least one of sound-absorbing particles and sound-absorbing raw powder with different particle size distributions, and mainly plays a role of sound absorption. The porosity of the main body is 40-90%. The porous structure in the main body can encapsulate the sound-absorbing material on the one hand to prevent the sound-absorbing material from colliding with each other in the back cavity and causing powder to enter the monomer. On the other hand, the main body has good air permeability, allowing smooth entry and exit of the gas in the back cavity without affecting the acoustic performance of the sound-absorbing material. The bursting strength of the main body is greater than 5N. When an external force acts, the outer shell of the main body is not easily damaged, and the sound-absorbing material filled therein can be blocked from leaking out, thereby achieving good encapsulation and ventilation effects and improving the low-frequency performance of the speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 A cross-sectional view of an embodiment of a sound absorbing assembly according to the present invention;

[0022] 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;

[0023] Figure 3 It is a cross-sectional view of an embodiment of the sound-generating device according to the present invention;

[0024] Figure 4 It is a cross-sectional view of another embodiment of the sound-generating device according to the present invention.

[0025] Description of reference numerals:

[0026] 100. sound generating device; 110. sound generating unit;

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

[0028] 130, sound absorbing component; 131, shell; 131a, main body; 131b, cover; 132, sound absorbing material; 133, adhesive layer;

[0029] 140. Posterior vocal cavity.

[0030] 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

[0031] 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.

[0032] 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 cover 131b is covered on the main body 131a to seal the receiving space. The main body 131a is formed into a porous structure formed by stacking fiber filaments. The porosity of the main body 131a is 40-90%, and the bursting strength of the main body 131a is greater than 5N.

[0033] The main body 131a of this embodiment is formed into a porous structure formed by stacking fiber filaments. The fiber filaments have good flexibility and flexibly encapsulate the sound-absorbing particles to prevent the sound-absorbing particles from being crushed due to hard collision with the main body. The porous structure is air-permeable, allowing 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 component 130 while encapsulating the sound-absorbing material 132. The porosity of the main body 131a is 40-90%, for example, 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, there is a risk of leakage of the sound absorbing material 132, and the packaging effect is poor. Controlling the porosity within the range of 40-90% can not only make the airflow smoothly enter and exit the sound absorbing component 130, but also prevent the sound absorbing material 132 from leaking out.

[0034] The bursting strength of the main body 131a of this embodiment is greater than 5N, for example, 7N, 10N, 15N, 20N, 30N, 40N, 45N, 50N, etc. The bursting strength can be tested using the GB / T 14800-93 standard. It is understandable that if the bursting strength is too small, the sound-absorbing component 130 is prone to breakage or other damage under the action of external force, resulting in leakage of the sound-absorbing material 132, thereby affecting the packaging effect. The bursting strength is greater than 5N, which can prevent the sound-absorbing material 132 from colliding with each other in the back cavity and causing powder to enter the monomer, thereby providing good acoustic improvement performance. In some feasible embodiments, the bursting strength of the main body 131a can be further limited to less than 50N. If the bursting strength is too large, it may be necessary to stack fiber filaments with thicker wire diameters, or increase the thickness of the main body 131a, which will affect the air permeability and flexibility of the main body 131a. The bursting strength of the main body 131a is within the range of 5-50N, so that the outer shell of the main body 131a of the sound-absorbing component 130 is not easily broken due to the action of external force during the reliability test, and the sound-absorbing material 132 filled therein can be prevented from leaking out, thereby achieving good packaging and ventilation effects.

[0035] In some feasible embodiments, 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.

[0036] 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. If the shell 131 is too thin, its air permeability is good, but its mechanical properties are poor, it is easy to break, the stiffness is not enough, and it is easy to deform during the assembly process, which cannot meet the use requirements; if the shell 131 is too thick, the airflow entering the sound absorbing component 130 is not smooth, which affects the function of the sound absorbing material 132, further affects the acoustic effect, and occupies more back cavity space, affecting 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.

[0037] In some feasible embodiments, the surface density of the main body 131a is 15-100 g / m 2 , for example, 15g / m 2 , 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 packaging effect; 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, making 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.

[0038] 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, which affects the packaging effect. 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 good air permeability effect.

[0039] 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, and the sound-absorbing material 132 filled therein has the risk of leakage, and the packaging effect deteriorates. 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 acoustic performance in a high-temperature working environment.

[0040] In some feasible embodiments, the breaking strength of the main body 131a is 1-80N, for example, 1N, 5N, 10N, 20N, 30N, 50N, 70N, 80N, etc. The breaking elongation of the main body 131a 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 is understandable that the tighter the entanglement between the fiber filaments, the larger the thermal bonding points of the fiber filaments, the greater the cohesion between the fiber filaments, and the greater the force required to break the main body 131a. If the breaking strength and breaking elongation are too small, the cohesion between the fibers is small and the fibers are prone to breakage 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 and have poorer air permeability. The breaking strength within the range of 1-80N can avoid the problem of increasing the distance between the fibers due to excessive stretching of the main body 131a 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 less likely to be broken during the molding process.

[0041] 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.

[0042] In some feasible implementations, 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 covalent-organic framework material. It is understandable that the above-mentioned types of materials all have a porous structure, and produce a sound absorbing effect 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 absorbing effect, filling difficulty, and other factors.

[0043] 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 shell 131.

[0044] In some feasible embodiments, the cover portion 131a is a double-sided adhesive, a hot melt adhesive film, a plastic film or the same material as the main body. 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 as the main body 131a in improving the resonant frequency of the sound-generating device 100.

[0045] 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.

[0046] In this embodiment, the sound-absorbing material 132 includes at least one of sound-absorbing particles and sound-absorbing raw powder with different particle size distributions, which mainly plays a role of sound absorption. The porosity of the main body 131a is 40-90%. The porous structure in the main body 131a can encapsulate the sound-absorbing material 132 on the one hand, to prevent the sound-absorbing material 132 from colliding with each other in the back cavity and causing powder to enter the monomer. On the other hand, the main body 131a has good air permeability, allowing smooth entry and exit of gas in the back cavity without affecting the acoustic performance of the sound-absorbing material 132. The bursting strength of the main body 131a is greater than 5N. When an external force acts, the outer shell of the main body 131a is not easily damaged, and can prevent the sound-absorbing material 132 filled therein from leaking out, thereby achieving good encapsulation and ventilation effects, thereby protecting the sound-emitting monomer 110 from contamination and improving the low-frequency performance of the sound-emitting device 100.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] An embodiment of the present invention further provides an electronic device, which includes the sound-generating device 100 as described in the above embodiment.

[0051] 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.

[0052] 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 here.

[0053] 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 does not specifically limit the present invention.

[0054] Example 1

[0055] The surface density is 35g / m 2 , 0.1mm thick PP meltblown cloth is used as the membrane material of the main body 131a, with a bursting strength of 30N. The PP meltblown cloth is hot-pressed to obtain the main body 131a of the required shape, with a volume of 0.32ml. A molecular sieve with a particle size of 2μm 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 a 2μm 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 an assembled speaker.

[0056] Example 2

[0057] The surface density is 35g / m 2 , PP meltblown cloth with a thickness of 0.1mm is used as the membrane material of the main body 131a, with a bursting strength of 30N. The PP meltblown cloth is hot-pressed to obtain the main body 131a of the desired shape, with a volume of 0.32ml. Molecular sieve sound-absorbing particles with an average particle size of 200-300μm (particles formed by bonding multiple molecular sieves with a particle size of 2μm 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 0.28ml. 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.

[0058] Comparative Example

[0059] Molecular sieve sound-absorbing particles with an average particle size of 200-300 μm (particles formed by bonding multiple molecular sieves with a particle size of 2 μm with an adhesive) are used as the sound-absorbing material 132, and 0.28 ml of the sound-absorbing material 132 is directly filled into the rear cavity of the speaker with a volume of 0.35 ml to obtain an assembled speaker.

[0060] It should be noted that the models and structural dimensions of the speakers in Examples 1-2 and the comparative example are consistent.

[0061] High temperature and high humidity power-on test evaluation: The speakers of Examples 1-2 and the comparative example were placed in a 65°C, 95% RH (humidity) environment, a 3.5V voltage pink noise signal was applied, and the speakers were continuously powered on for 120 hours. After the reliability test, each group of speakers F0 was tested, and each group of speakers was disassembled to observe the damage of the sound absorbing component 130. The test results are shown in Table 1 below.

[0062] Table 1

[0063]

[0064] As can be seen from Table 1, after the high temperature and high humidity power-on test, the F0 changes of the speakers of Example 1 and Example 2 are better than those of the comparative example speakers, indicating that the sound absorbing assembly 130 of the present invention can withstand the experimental conditions of high temperature and high humidity. This is because both Example 1 and Example 2 use a shell 131 to encapsulate the sound absorbing material 132, and the main body has a large bursting strength, which effectively encapsulates the sound absorbing material 132. The sound absorbing assembly 130 of Example 1 and Example 2 is not damaged and no fine powder leaks out. Although the sound absorbing particles in the comparative example are relatively intact, fine powder falls off and adheres to the rear cavity shell and the surface of the sound-emitting monomer, indicating that the sound absorbing particles directly filled still have the risk of powder falling, and the shell 131 made of a film material with appropriate porosity and surface density can reduce this risk and provide a good acoustic improvement effect.

[0065] 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.

[0066] Table 2

[0067] 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

[0068] 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 in the comparative 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. Therefore, the sound-absorbing component 130 of the present invention can solve the problem of polluting the sound-emitting unit due to the breaking and falling of sound-absorbing particles, and avoid the low-frequency performance degradation caused by the pollution of the sound-emitting unit.

[0069] 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 part, 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 cover part is covered on the main body to seal the storage space, wherein the main body is formed into a porous structure formed by stacking fiber filaments, the porosity of the main body is 40-90%, and the bursting strength of the main body is greater than 5N.

2. The sound absorbing assembly according to claim 1, characterized in that 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 15-100g / m 2 .

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

6. The sound absorbing assembly according to claim 1, characterized in that: The breaking strength of the main body is 1-80N; and / or the breaking elongation of the main body is 1-60%.

7. The sound absorbing assembly according to claim 1, characterized in that The bursting strength of the main body is less than 50N.

8. The sound absorbing assembly according to claim 1, wherein: The sound-absorbing material comprises at least one of activated carbon, zeolite powder, silica, porous alumina, molecular sieve, metal-organic framework material, aerogel, and covalent-organic framework material; and / or 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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