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 sound absorption particles 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 particles are filled in the containing space, and the sealing cover part covers the containing space. The sound-absorbing particles comprise a plurality of sound-absorbing raw powder and an adhesive for integrally adhering the plurality of sound-absorbing raw powder, the sealing cover part covers the main body part to seal the accommodating space, the main body part forms a porous structure formed by stacking cellosilk, the thickness of the main body part is 0.06-0.5 mm, the air permeability of the main body part is 500-5000mm / s, and the surface density of the main body part is 20-100g / m < 2 >. The main body part of the sound-absorbing assembly has proper thickness, air permeability and surface density, the sound-absorbing particles are effectively packaged, the sound-absorbing assembly can provide a certain sound-absorbing effect, and the overall sound-absorbing effect of the sound-absorbing assembly is improved.

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] The existing speaker back cavity is filled with sound-absorbing particles. During operation, the particles are easily broken and shed due to friction and collision. The broken dust enters the sound-generating unit, causing abnormal operation, increasing F0 and poor low-frequency effect. Encapsulating the sound-absorbing particles in a closed space can solve the problem of broken powder pollution to a certain extent, but the encapsulated shell needs to occupy the back cavity space, which will sacrifice some sound absorption performance. 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 prone to breakage and powdering, resulting in contamination of the sound-emitting unit and poor low-frequency performance, and to enhance the acoustic improvement performance of the sound-absorbing component.

[0005] To achieve the above-mentioned object, the present invention provides a sound-absorbing component, comprising a shell and sound-absorbing particles filled in the shell, the shell comprising a main body and a cover part, the main body defines a storage space, the sound-absorbing particles are filled in the storage space, 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, 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 thickness of the main body is 0.06mm-0.5mm, the air permeability of the main body is 500-5000mm / s, and the surface density of the main body is 20-100g / m 2 .

[0006] In one embodiment, the breaking strength of the main body is 5-80N; and / or the breaking elongation of the main body is 1-60%.

[0007] In one embodiment, the bursting strength of the main body is 1-60N.

[0008] In one embodiment, the porosity of the main body is 30%-90%;

[0009] And / or, the softening point of the fiber filaments in the main body is greater than or equal to 100°C.

[0010] In one embodiment, the sound-absorbing particles include at least one of activated carbon, zeolite powder, silica, porous alumina, molecular sieves, metal-organic framework materials, aerogels, and COF.

[0011] In one embodiment, the adhesive includes an organic adhesive and / or an inorganic adhesive, the organic adhesive includes at least one of polyacrylates, polyurethanes, and silicones; and / or the inorganic adhesive includes at least one of silicates, silica sols, aluminum sols, phosphates, sulfates, and borates.

[0012] In one embodiment, the particle size of the sound absorbing particles is 20-1000 μm.

[0013] In one embodiment, the granulation method of the sound absorbing particles includes spray drying granulation, boiling granulation, freeze drying granulation, and stirring granulation.

[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, wherein the sound-absorbing component comprises a shell and sound-absorbing particles filled in the shell, wherein the shell comprises a main body and a cover, wherein the main body defines a storage space, wherein the sound-absorbing particles are filled in the storage space, wherein 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, wherein the cover 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, wherein the thickness of the main body is 0.06 mm-0.5 mm, the air permeability of the main body is 500-5000 mm / s, and the surface density of the main body is 20-100 g / m 2 The thickness of the main body is 0.06mm-0.5mm. The thickness within this range makes the rear cavity occupied by the main body smaller, and at the same time has certain mechanical properties and is not easy to be damaged; the air permeability of the main body is 500-5000mm / s, that is, it has good air permeability, and the air flow can smoothly enter and exit the main body, which will not have a significant impact on the acoustic performance of the sound-absorbing particles, and can also encapsulate the sound-absorbing particles; the surface density of the main body is 20-100g / m 2 The fiber filaments have a moderate arrangement density, which can not only encapsulate the sound-absorbing particles, but also provide good air permeability, allowing air flow in and out, and the main body has a porous structure, which also has a sound-absorbing effect, and can offset the volume of the rear cavity space occupied by it to a certain extent. Therefore, the sound-absorbing component of the present invention solves the problem of powder pollution generated by the sound-absorbing particles, and can also ensure good air permeability, so that the sound-absorbing particles can better play their role and have good acoustic improvement performance. 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 particles; 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 sound-absorbing particles 132 filled in the shell 131. The shell 131 includes a main body 131a and a cover 131b. The main body 131a defines a storage space. The sound-absorbing particles 132 are filled in the storage space. The sound-absorbing particles 132 include a plurality of sound-absorbing raw powders and an adhesive for bonding the plurality of sound-absorbing raw powders into one. The cover 131b is covered on the main body 131a to seal the storage space. The main body 131a is formed into a porous structure formed by stacking fiber filaments. The thickness of the main body 131a is 0.06mm-0.5mm, the air permeability of the main body 131a is 500-5000mm / s, and the surface density of the main body 131a is 20-100g / m 2 .

[0034] The main body 131a of this embodiment is formed as a porous structure formed by stacking fiber filaments. The main body 131a of the porous structure is air permeable, allowing the gas in the back cavity to enter and exit, and the porous structure also has a sound absorption function, which can improve the overall sound absorption effect of the sound absorption component 130 while encapsulating the sound absorbing particles 132.

[0035] The thickness of the main body 131a of this embodiment is 0.06mm-0.5mm, for example, 0.06mm, 0.08mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc. It can be understood that the main body 131a is thin, and its air permeability is good, but the mechanical properties are poor, it is easy to be damaged, the stiffness is not enough, and it is easy to deform during the assembly process, and it cannot meet the use requirements; if the thickness of the main body 131a is too thick, the airflow entering the sound-absorbing component 130 is not smooth, which affects the function of the sound-absorbing particles 132, further affects the acoustic effect, and occupies the back cavity space, which also affects the acoustic effect. Controlling the thickness of the main body 131a within the range of 0.06-0.5mm can make it have sufficient mechanical properties, reduce the risk of damage, and obtain good air permeability without affecting the acoustic effect of the sound-absorbing particles 132.

[0036] The air permeability of the main body 131a of this embodiment is 500-5000mm / s, for example, 500mm / s, 800mm / s, 1000mm / s, 1500mm / s, 2000mm / s, 3000mm / s, 4000mm / s, 4500mm / s, 5000mm / s, etc. The air permeability test can refer to GB / T 5453-1997 standard, using a test pressure of 200Pa and a test area of ​​20cm 2 Test conditions. It is understandable that if the air permeability is too low, the efficiency of air passing through the main body 131a will be reduced, affecting the acoustic performance of the internal sound-absorbing particles 132; if the air permeability is too high, it means that the size of the holes in the main body 131a is too large or the hole structure is sparse, which is easy to affect the encapsulation of the sound-absorbing particles 132, and the sound-absorbing particles 132 enter the rear cavity and collide with each other, resulting in powder leakage. Controlling the air permeability of the main body 131a within the range of 500-5000mm / s can not only encapsulate the sound-absorbing particles 132, but also provide certain acoustic performance with its own stacked pore structure.

[0037] The surface density of the main body 131a in this embodiment 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 2Etc. 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 particles 132 are easy to leak out of the shell 131, enter the rear cavity and collide with each other, resulting in the problem of powder leakage; 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 particles 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 particles 132 and ensure the smoothness of the airflow entering the sound-absorbing component 130.

[0038] In some feasible embodiments, the breaking strength of the main body 131a is 5-80N, for example, 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, 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 5-80N 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 sound-absorbing particles 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.

[0039] In some feasible embodiments, the bursting strength of the main body 131a is 1-60N, for example, 1N, 5N, 10N, 20N, 30N, 40N, 50N, 55N, 60N, etc. It is understandable that if the bursting strength is too small, the sound-absorbing component 130 is prone to breakage or other damage when an external force acts on it, resulting in leakage of the sound-absorbing particles 132, and the sound-absorbing particles 132 enter the rear cavity and collide with each other, causing powder leakage. A bursting strength greater than 1N can prevent the sound-absorbing particles 132 from leaking out and entering the rear cavity to collide with each other to produce powder that contaminates the sound-emitting monomer 110, providing good acoustic improvement performance. If the bursting strength is too large, it may be necessary to stack fibers 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 1-60N, so that the outer shell of the main body 131a of the sound-absorbing component 130 is not easily broken when an external force is applied during a reliability test, and the sound-absorbing particles 132 filled therein can be prevented from leaking out, thereby achieving a good packaging and ventilation effect.

[0040] 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 leaking sound-absorbing particles 132, and then the sound-absorbing particles 132 enter the rear cavity and collide with each other to cause powder leakage. Controlling the porosity within the range of 30-90% can not only make the airflow enter and exit the sound-absorbing component 130 smoothly, but also prevent the sound-absorbing particles 132 from leaking out, and the packaging effect and air permeability are good.

[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, and the sound-absorbing particles 132 filled therein have the risk of leaking out into the rear cavity and colliding with each other to cause powder leakage. Therefore, selecting a softening point of the fiber filaments greater than or equal to 100°C helps the sound-absorbing component 130 maintain acoustic performance in a high-temperature working environment.

[0042] The sound-absorbing particles 132 of this embodiment include a plurality of sound-absorbing raw powders and an adhesive bonding the plurality of sound-absorbing raw powders together. The sound-absorbing particles may be spherical, such as a solid sphere, or a sphere with a concave hole, which may form an air circulation channel communicating with the external space to achieve a better sound absorption effect.

[0043] In some feasible embodiments, the sound-absorbing particles 132 include 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 suitable sound-absorbing particles 132 based on actual considerations of sound absorption effect, filling difficulty and other factors.

[0044] In some feasible embodiments, the adhesive includes an organic adhesive and / or an inorganic adhesive. The organic adhesive that can be used includes at least one of polyacrylates, polyurethanes, and silicones. The inorganic adhesive that can be used includes at least one of silicates, silica sols, aluminum sols, phosphates, sulfates, and borates. It is understandable that different types of adhesives have different properties and different adhesive strengths to different substances. The type of adhesive used can be selected according to the specific type of the sound-absorbing raw powder, and different types of adhesives can also be mixed to achieve the desired bonding effect.

[0045] In some feasible embodiments, the particle size of the sound-absorbing particles 132 is 20-1000 μm, for example, 20 μm, 50 μm, 100 μm, 300 μm, 500 μm, 800 μm, 1000 μm, etc. It is understandable that the particle size of the sound-absorbing particles 132 is different, the amount of sound-absorbing raw powder contained in the unit volume is different, the amount of adhesive used is also different, and there are certain differences in the process control during the preparation process. In this embodiment, the sound-absorbing particles 132 filled in the shell 131 can be used in a wide range of particle size distribution, reaching 20-1000 μm, which can improve the use efficiency of the sound-absorbing particles 132 and reduce costs.

[0046] In some feasible embodiments, the granulation method of the sound-absorbing particles 132 includes spray drying granulation, boiling granulation, freeze drying granulation, and stirring granulation. Specifically, the drying process of spray drying granulation is rapid and the particles are uniform. Boiling granulation is fast and can be produced continuously. Freeze drying granulation can effectively prevent agglomeration and prepare powders with controllable particle size. Stirring granulation has a wide range of applicability and can use adhesives of different viscosities. A suitable granulation method can be selected for preparation according to the requirements for the particle size or other factors of the sound-absorbing particles 132.

[0047] 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 function of improving the resonant frequency of the sound-generating device 100 like the main body 131a.

[0048] 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 sound absorbing particles 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.

[0049] In this embodiment, the thickness of the main body 131a is 0.06mm-0.5mm. The thickness within this range makes the rear cavity volume occupied by the main body 131a smaller, and at the same time has certain mechanical properties and is not easy to be damaged; the air permeability of the main body 131a is 500-5000mm / s, that is, it has good air permeability, and the air flow can smoothly enter and exit the main body 131a, which will not have a significant impact on the acoustic performance of the sound-absorbing particles 132, and can also encapsulate the sound-absorbing particles 132; the surface density of the main body 131a is 20-100g / m 2 The fiber filaments are arranged at a moderate density, which can not only encapsulate the sound-absorbing particles 132, but also provide good air permeability, allowing air flow in and out, and the main body 131a is a porous structure, which also has a sound-absorbing effect, and can offset the volume of the rear cavity space occupied by it to a certain extent. Therefore, the sound-absorbing component 130 of the present invention solves the problem of powder pollution generated by the sound-absorbing particles 132, and can also ensure good air permeability, so that the sound-absorbing particles 132 can better play their role and have good acoustic improvement performance.

[0050] 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.

[0051] Optionally, refer to Figure 4 The 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.

[0052] 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.

[0053] An embodiment of the present invention further provides an electronic device, which includes the sound-generating device 100 as described in the above embodiment.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] Example 1

[0058] The surface density is 45g / m 2The main body 131a membrane material is a spunbond fabric with a thickness of 0.19mm and an air permeability of 800mm / s. The main body 131a membrane material is hot-pressed to obtain the main body 131a of the desired shape with a volume of 0.36ml. Sound-absorbing particles 132 with a particle size of 300-400μm (particles formed by bonding multiple molecular sieves with a particle size of 12μm through an adhesive) are used and filled into the molded main body 131a with a filling amount of 100%. The surface density is 45g / m 2 The spunbond fabric with a thickness of 0.19 mm 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 particles 132 are filled, and the opening is sealed by a hot melt process. After sealing, the sound absorbing component 130 filled with the sound absorbing particles 132 of 200-300 μm 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.

[0059] Example 2

[0060] The surface density is 35g / m 2 The main body 131a membrane material is a spunbond fabric with a thickness of 0.15mm and an air permeability of 1200mm / s. The main body 131a membrane material is hot-pressed to obtain the main body 131a of the required shape, with a volume of 0.36ml. Sound-absorbing particles 132 with a particle size of 300-400μm (particles formed by bonding multiple molecular sieves with a particle size of 12μm through an adhesive) are used, and the sound-absorbing particles 132 are filled into the molded main body 131a, with a filling amount of 100%. The surface density is 35g / m 2 The spunbond fabric with a thickness of 0.15 mm 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 particles 132 are filled, and the opening is sealed by a hot melt process. After sealing, the sound absorbing component 130 filled with 200-300 μm sound absorbing particles 132 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.

[0061] Comparative Example

[0062] Using sound-absorbing particles 132 with a particle size of 300-400 μm (particles formed by bonding multiple molecular sieves with a particle size of 12 μm by an adhesive), 0.36 ml of the sound-absorbing particles 132 are directly filled into the rear cavity of the speaker with a volume of 0.4 ml to obtain an assembled speaker.

[0063] It should be noted that the structural dimensions of the speakers in Examples 1-2 and the comparative example are consistent.

[0064] 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.

[0065] Table 1

[0066] serial number F0(Hz) Check if the sound absorbing components have any powder falling off Example 1 647 none Example 2 638 none Comparative Example 650 /

[0067] The F0 of the speakers of Example 1 and Example 2 are slightly better than that of the speaker of the comparative example, mainly because the speakers of Example 1 and Example 2 both include a shell 131, which is a porous structure and also has a certain sound absorption function. The F0 of the speaker of Example 2 is better than that of the speaker of Example 1, mainly because the air permeability of the shell 131 of the speaker of Example 2 is higher than that of the shell 131 of the speaker of Example 1, and has higher air permeability, which is conducive to the entry of gas into the sound absorbing component 130, so that the sound absorbing particles 132 can play a better role.

[0068] 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 2 below.

[0069] Table 2

[0070]

[0071] From the results of the high temperature and high humidity power-on test in Table 2, it can be seen that the F0 variation of the speakers of Example 1 and Example 2 is better than that of the speaker of the comparative example, 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 particles 132, forming an effective encapsulation of the sound absorbing particles 132. The sound absorbing assemblies 130 of Example 1 and Example 2 are 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 monomer, indicating that the sound absorbing particles directly filled collide in the rear cavity, thereby posing the risk of powder falling. The shell 131 made of a film material with appropriate thickness, air permeability and surface density can reduce this risk and provide a good acoustic improvement effect.

[0072] 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 3 below.

[0073] Table 3

[0074] 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

[0075] It can be seen from the experimental results in Table 3 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 132 directly filled 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 particles 132, which can not only prevent the sound-absorbing particles 132 from entering the speaker unit, but also can maximize the buffering of the impact between the sound-absorbing particles 132 and the sound-absorbing particles 132 and the sound-absorbing particles 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 powder generated by the sound-absorbing particles 132 from entering the speaker unit, and can also ensure good air permeability, so that the sound-absorbing particles 132 can better play their role.

[0076] 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 sound-absorbing particles filled in the shell, the shell comprises a main body and a cover part, the main body defines a storage space, the sound-absorbing particles are filled in the storage space, 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 thickness of the main body is 0.06 mm-0.5 mm, the air permeability of the main body is 500-5000 mm / s, and the surface density of the main body is 20-100 g / m 2 .

2. The sound absorbing assembly according to claim 1, characterized in that The breaking strength of the main body is 5-80N; and / or the breaking elongation of the main body is 1-60%.

3. The sound absorbing assembly according to claim 1, characterized in that: The bursting strength of the main body is 1-60N.

4. The sound absorbing assembly according to claim 1, characterized in that The porosity of the main body is 30%-90%; And / or, the softening point of the fiber filaments in the main body is greater than or equal to 100°C.

5. The sound absorbing assembly according to claim 1, characterized in that: The sound-absorbing particles include at least one of activated carbon, zeolite powder, silicon dioxide, porous alumina, molecular sieves, metal-organic framework materials, aerogels, and COF.

6. The sound absorbing assembly according to claim 1, characterized in that: The adhesive includes an organic adhesive and / or an inorganic adhesive, the organic adhesive includes at least one of polyacrylates, polyurethanes, and silicones; and / or the inorganic adhesive includes at least one of silicates, silica sols, aluminum sols, phosphates, sulfates, and borates.

7. The sound absorbing assembly according to claim 1, characterized in that The particle size of the sound-absorbing particles is 20-1000 μm.

8. The sound absorbing assembly according to claim 1, wherein: The granulation method of the sound-absorbing particles includes spray drying granulation, boiling granulation, freeze drying granulation and stirring granulation.

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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