Sound production device and electronic device

Abstract

The utility model belongs to the electroacoustic technology field, and concretely relates to a sound production device and electronic equipment, and the sound production device comprises a shell with an internal space, a sound production unit arranged in the internal space of the shell and a gas-permeable isolating piece, the sound production unit cooperates with the shell to define a front sound cavity and a rear sound cavity in the internal space, the rear sound cavity is filled with sound-absorbing material, the gas-permeable isolating piece is used for isolating the sound-absorbing material from the sound production unit, the gas-permeable isolating piece is a nuclear pore membrane, and the nuclear pore membrane comprises a membrane body and a plurality of gas-permeable micropores arranged on the membrane body. In the utility model, the nuclear pore membrane has a smaller pore diameter than the woven mesh cloth, can effectively isolate the sound-absorbing material under the condition of reaching the required gas permeability, and thus at least solves the problem that the sound-absorbing material is broken and powder leaks out due to collision and friction in work, thereby polluting the sound production unit.

Description

Technical Field

[0001] This utility model belongs to the field of electroacoustic technology, and specifically relates to a sound-generating device and electronic equipment. Background Technology

[0002] In recent years, with the trend of increasingly thinner and lighter electronic products, the space left for speakers is getting smaller and smaller. The flattened design of miniature speaker modules has resulted in a reduction in the volume of the acoustic rear cavity. In order to solve the problem of reduced low-frequency performance of speakers caused by the reduced space, technicians fill the rear acoustic cavity with sound-absorbing particles made of porous materials (such as activated carbon, natural zeolite powder, activated silica, porous alumina, molecular sieves, or mixtures made in specific types and proportions). By utilizing the special physical channel structure inside the porous material, the gas in the rear acoustic cavity is quickly adsorbed and desorbed, which realizes the virtual increase of the acoustic rear cavity resonance space of the speaker, thereby effectively reducing the speaker resonant frequency F0 and improving low-frequency sensitivity.

[0003] Currently, woven mesh is commonly used to isolate sound-absorbing particles in the rear acoustic cavity of loudspeakers. To meet the requirements, the pore size of the woven mesh is about 30μm. The sound-absorbing particles are made by bonding zeolite powder with adhesive. The average particle size of the sound-absorbing particles is 300μm to 400μm. However, because the sound-absorbing particles move and collide and rub during the operation of the rear acoustic cavity, they are prone to breakage. The falling powder leaks out from the woven mesh and contaminates the sound-generating unit, affecting the acoustic performance.

[0004] Therefore, existing speakers still need improvement. Utility Model Content

[0005] The purpose of this invention is to provide a sound-generating device and an electronic device. In the sound-generating device of this invention, the breathable isolation component used to isolate the sound-absorbing material from the sound-generating unit is a core-pore membrane. The core-pore membrane has a smaller pore size than woven mesh. Under the condition of achieving the required air permeability, it can effectively isolate the sound-absorbing material, thereby at least solving the problem of the sound-absorbing material breaking and leaking powder due to collision and friction during operation, which contaminates the sound-generating unit.

[0006] The first aspect of this utility model provides a sound-generating device, which includes a housing with an internal space, a sound-generating unit disposed inside the housing, and a breathable isolation component. The sound-generating unit cooperates with the housing to define a front sound cavity and a rear sound cavity within its internal space. The rear sound cavity is filled with a sound-absorbing material. The breathable isolation component is used to isolate the sound-absorbing material from the sound-generating unit. The breathable isolation component is a nucleopore membrane, which includes a membrane body and a plurality of breathable micropores formed on the membrane body.

[0007] In some embodiments of this utility model, the pore size of the breathable micropores is 5μm to 20μm.

[0008] In some embodiments of this invention, the pore density of the nuclear pore membrane is 0.9 × 10⁻⁶. 5 ~4×10 5 .

[0009] In some embodiments of this invention, the air permeability of the nuclear pore membrane is 1000 L / m. 2 .S@20mmH2O~8000L / m 2 .S@20mmH2O.

[0010] In some embodiments of this invention, the thickness of the nuclear pore membrane is 2 μm to 20 μm.

[0011] In some embodiments of this invention, the tensile strength of the nuclear pore membrane is 5 MPa to 50 MPa.

[0012] In some embodiments of this utility model, the material of the membrane body includes one of polycarbonate, polyester, polypropylene, polyimide, polyvinylidene fluoride, and polytetrafluoroethylene.

[0013] In some embodiments of this utility model, the breathable insulating member is disposed in the rear acoustic cavity and cooperates with the housing to isolate a sound-absorbing cavity in the rear acoustic cavity, and the sound-absorbing material is filled in the sound-absorbing cavity.

[0014] In some embodiments of this utility model, the breathable insulating component is connected to the shell by any one of the following methods: bonding, hot melt sealing, or injection molding.

[0015] In some embodiments of this utility model, the breathable insulating member covers the outer periphery of the sound-emitting unit to isolate the sound-emitting unit from the sound-absorbing material.

[0016] In some embodiments of this utility model, the sound-absorbing material is molecular sieve powder, the average particle size D50 of the molecular sieve powder is 20μm to 50μm, and the silicon-to-aluminum ratio of the molecular sieve powder is <200.

[0017] In some embodiments of this utility model, the sound-absorbing material includes sound-absorbing particles, which are formed by bonding multiple porous raw powders and adhesives.

[0018] In some embodiments of this utility model, the adhesive includes at least one of organic adhesives and inorganic adhesives.

[0019] In some embodiments of this utility model, the porous raw powder includes one or more of activated carbon, silica, porous alumina, molecular sieve particles, metal-organic framework materials, aerogel, and COF.

[0020] In some embodiments of this utility model, the organic adhesive includes one or more of polyacrylates, polyurethanes, and silicones.

[0021] In some embodiments of this utility model, the inorganic adhesive includes at least one of silicates, silica sols, aluminosilicates, phosphates, sulfates, and borates.

[0022] In some embodiments of this utility model, the particle size of the sound-absorbing particles is 100μm to 600μm.

[0023] The second aspect of this utility model also provides an electronic device, which includes the sound-generating device described in the first aspect.

[0024] The breathable isolation component used to isolate sound-absorbing materials from sound-generating units in this invention is composed of a core-pore membrane. The core-pore membrane has a smaller pore size than woven mesh. Under the condition of achieving the required air permeability, it can effectively isolate the sound-absorbing material, thereby at least solving the problem of sound-absorbing material breaking and leaking powder due to collision and friction during operation, which contaminates the sound-generating unit.

[0025] In this invention, the sound-absorbing material can be molecular sieve powder, thereby reducing the preparation process of the sound-absorbing particles, simplifying the operation, and lowering the cost. Moreover, under the premise of the same filling volume, since molecular sieve powder does not require glue to bond, while sound-absorbing particles require adhesive to bond multiple molecular sieve powder particles together, more volume of molecular sieve powder can be filled into the rear acoustic cavity when only molecular sieve powder is filled, thereby improving the sound absorption effect and further enhancing the low-frequency performance of the sound-generating device.

[0026] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the sound-generating device in one embodiment of the present invention.

[0029] Figure 2This is a schematic diagram of the sound-generating device in another embodiment of the present invention.

[0030] Figure 3 This is a SEM image of the nuclear pore membrane in this invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100 - Sound-generating device;

[0033] 10-Shell, 20-Sound-generating unit, 30-Breathable insulation component; 40-Sound-absorbing material. Detailed Implementation

[0034] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0035] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0036] In the description of the embodiments of this utility model, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly defined.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] In the description of this utility model embodiment, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0039] In the description of the embodiments of this utility model, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0040] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0041] The first aspect of this utility model provides a sound-generating device, combined with Figure 1 and Figure 2 The sound-generating device 100 includes a housing 10 with an internal space, a sound-generating unit 20 disposed inside the housing 10, and a breathable isolation member 30. The sound-generating unit 20 cooperates with the housing 10 to define a front sound cavity and a rear sound cavity within its internal space. The rear sound cavity is filled with a sound-absorbing material 40. The breathable isolation member 30 is used to isolate the sound-absorbing material 40 from the sound-generating unit 20. The breathable isolation member 30 is a nucleopore membrane, which includes a membrane body and a plurality of breathable micropores formed on the membrane body.

[0042] In this embodiment of the invention, the breathable insulating component 30 is used to isolate the sound-absorbing material 40 from the sound-generating unit 20. Specifically, the breathable insulating component 30 is composed of a core-pore membrane. The core-pore membrane is formed by irradiating a thin film with high-energy particles, causing the polymer chains to break and form irradiation damage channels. The irradiation damage channels are then oxidized and etched using chemical reagents to finally form pores. By adjusting the irradiation intensity, etching conditions, and material parameters, the pore size and pore density can be precisely controlled. Compared with the currently used insulating mesh fabric woven by a weaving process, the pore size of the core-pore membrane is much smaller than that of the woven mesh fabric, which can effectively isolate the sound-absorbing material 40, thereby solving the problem of the sound-absorbing material 40 breaking and leaking powder due to collision and friction during operation, thus contaminating the sound-generating unit 20.

[0043] In some embodiments of the utility model, the pore size of the breathable micropores is 5μm to 20μm. It should be noted that if the pore size of the breathable micropores is too small, the air permeability of the core-pore membrane is low, significantly reducing the sound absorption effect of the sound-absorbing material 40; conversely, if the pore size of the breathable micropores is too large, the encapsulated sound-absorbing material 40 is prone to leakage, failing to achieve an effective sound absorption effect. In this utility model embodiment, when the pore size of the breathable micropores is 5μm to 20μm, the core-pore membrane can not only effectively encapsulate the sound-absorbing material 40 but also ensure its air permeability. The pore size of the breathable micropores provided by this utility model can be any value within the range of any two values ​​mentioned above, such as 5μm to 10μm, or 10μm to 20μm, and so on. For example, in the embodiments of this utility model, the pore size of the breathable micropores can be one of 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, and 20μm, or any value that satisfies the above range.

[0044] In some embodiments of the utility model, the pore density of the nuclear pore membrane is 0.9 × 10⁻⁶. 5 ~4×10 5 Pore ​​density refers to the number of pores present on the nuclear pore membrane per square centimeter. Too low a pore density results in low air permeability of the nuclear pore membrane, thus affecting the sound absorption effect of the sound-absorbing material 40 and failing to meet acoustic performance requirements. Conversely, too high a pore density increases the diporosity of the nuclear pore membrane, disrupting the uniformity of pore size, posing a risk of leakage to the sound-absorbing material 40, contaminating the sound-generating unit 20, and affecting acoustic performance. In this embodiment of the present invention, the pore density of the nuclear pore membrane is 0.9 × 10⁻⁶. 5 ~4×10 5 At the same time, it can not only effectively encapsulate the sound-absorbing material 40, but also ensure its air permeability. The pore density of the core pore mold provided by this utility model can be any value within the range formed by any two values ​​mentioned above, for example, it can be 0.9 × 10⁻⁶. 5 ~2×10 5 It can also be 2×10 5 ~4×10 5 And so on. For example, in this embodiment of the invention, the pore density of the nuclear pore membrane can also be 0.9 × 10⁻⁶. 5 1×10 5 1.2×10 5 1.5×10 5 1.8×10 5 2×10 5 2.2×10 5 2.5×10 5 2.8×10 5 3×10 53.2×10 5 3.5×10 5 3.8×10 5 4×10 5 One of the above values ​​or any value that satisfies the above range.

[0045] In some embodiments of the utility model, the air permeability of the nuclear pore membrane is 1000 L / m. 2 .S@20mmH2O~8000L / m 2 .S@20mmH2O. It should be noted that if the air permeability of the nucleopore membrane is too low, its acoustic performance is poor, and the sound absorption effect of the sound-absorbing material 40 is greatly reduced; conversely, if the air permeability of the nucleopore membrane is too high, the diporosity of the nucleopore membrane is too high, and the sound-absorbing material 40 will leak out, contaminating the sound-generating monomer 20. In this embodiment of the invention, when the air permeability of the nucleopore membrane is 1000L / m 2 .S@20mmH2O~8000L / m 2 When S@20mmH2O, it can not only effectively encapsulate the sound-absorbing material 40, but also ensure its air permeability. The air permeability of the core-pore membrane provided by this utility model can be any value within the range formed by any two values ​​in the above range, such as 1000L / m 2 .S@20mmH2O~4000L / m 2 .S@20mmH2O, or 4000L / m 2 .S@20mmH2O~8000L / m 2 .S@20mmH2O, and so on. Exemplarily, in this embodiment of the invention, the permeability of the nuclear pore membrane can also be 1000 L / m³. 2 .S@20mmH2O, 2000L / m 2 .S@20mmH2O, 3000L / m 2 .S@20mmH2O, 4000L / m 2 .S@20mmH2O, 5000L / m 2 .S@20mmH2O, 6000L / m 2 .S@20mmH2O, 7000L / m 2 .S@20mmH2O, 8000L / m 2 One of the values ​​in .S@20mmH2O or any value that satisfies the above range.

[0046] In some embodiments of this invention, the thickness of the core-pore membrane is 2μm to 20μm. It is understood that if the core-pore membrane is too thin, its stiffness and strength are poor, making it prone to breakage during use and increasing the difficulty of assembly; while a thicker core-pore membrane has a longer pore depth, resulting in poor air permeability and affecting the sound absorption effect of the sound-absorbing material 40, thus failing to meet acoustic performance requirements. In the embodiments of this invention, when the thickness of the core-pore membrane is 2μm to 20μm, it not only ensures its strength during use and prevents breakage but also ensures its air permeability. The thickness of the core-pore membrane provided by this invention can be any value within the range of any two values ​​mentioned above, such as 2μm to 10μm, or 10μm to 20μm, and so on. For example, in the embodiments of this utility model, the thickness of the nuclear pore membrane can also be one of 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, 20μm or any value that satisfies the above range.

[0047] In some embodiments of this invention, the tensile strength of the nuclear pore membrane is 5 MPa to 50 MPa. This means that the nuclear pore membrane has high mechanical strength and can withstand large-amplitude tensile stresses during use without easily breaking. The tensile strength of the nuclear pore membrane provided by this invention can be one of 5 MPa, 10 MPa, 15 MPa, 20 MPa, 25 MPa, 30 MPa, 35 MPa, 40 MPa, 45 MPa, or 50 MPa, or any value satisfying the above range.

[0048] In some embodiments of this utility model, the material of the membrane body can be, but is not limited to, one of the following polymer materials: polycarbonate (PC), polyester (PET), polypropylene (PP), polyimide (PI), polyvinylidene fluoride (PVDF), and polytetrafluoroethylene (PTFE).

[0049] See Figure 1 As shown, the breathable isolation component 30 is disposed in the rear acoustic cavity. The breathable isolation component 30 cooperates with the housing 10 to isolate the sound-absorbing cavity in the rear acoustic cavity, and the sound-absorbing material 40 is filled in the sound-absorbing cavity.

[0050] In some embodiments of this utility model, the breathable insulating component 30 is connected to the shell 10 by any of the following methods: bonding, hot melt sealing, or injection molding, thereby isolating the sound-absorbing material 40. Bonding can be, but is not limited to, using adhesives, adhesive films, double-sided tape, or other adhesive materials.

[0051] See Figure 2 As shown, the breathable insulating component 30 covers the outer periphery of the sound-generating unit 20 to isolate the sound-generating unit 20 from the sound-absorbing material 40.

[0052] In some embodiments of this utility model, the breathable insulating member 30 can be disposed around the outer periphery of the sound-generating unit 20, for example, by adhesive bonding, thereby isolating it from the sound-absorbing material 40. Of course, other arrangements can also be adopted according to actual conditions, such as placing the breathable insulating member 30 within the rear acoustic cavity and arranging it around the sound-generating unit 20. In this case, the breathable insulating member 30 can be connected to the housing 10 to house the sound-generating unit 20 within the space formed by the breathable insulating member 30 and the housing 10. The connection method between the breathable insulating member 30 and the housing 10 can be, but is not limited to, bonding, heat-sealing, or injection molding.

[0053] In some embodiments of this invention, the sound-absorbing material 40 is molecular sieve powder, thereby reducing the preparation process of the sound-absorbing particles, simplifying operation, and lowering costs. Furthermore, under the same filling volume, since molecular sieve powder does not require glue bonding, while sound-absorbing particles require adhesive to bond multiple molecular sieve powder particles together, a larger volume of molecular sieve powder can be filled into the rear acoustic cavity when only molecular sieve powder is filled, thereby improving the sound absorption effect and further enhancing the low-frequency performance of the sound-generating device. In embodiments of this invention, the average particle size D50 of the molecular sieve powder is 20μm to 50μm, and the silicon-to-aluminum ratio of the molecular sieve powder is <200, which further enhances the sound absorption effect and improves the low-frequency performance of the sound-generating device.

[0054] This invention uses a laser particle size analyzer to test the average particle size D50 of molecular sieve powder, which is in the range of 20μm to 50μm. Within this particle size range, the internal structure of the molecular sieve powder is tightly arranged, and there can be more pore structure units per unit volume, resulting in better acoustic performance. Furthermore, the particles within this particle size range have good flowability and are easy to fill.

[0055] The average particle size D50 of the molecular sieve powder provided by this invention can be any value within the range of any two values ​​mentioned above, such as 20μm to 40μm, or 40μm to 50μm, and so on. Exemplarily, in embodiments of this invention, the average particle size D50 of the molecular sieve powder can also be one of 20μm, 30μm, 40μm, and 50μm, or any value satisfying the above range.

[0056] The silica-to-alumina ratio of the molecular sieve powder provided by this invention is <200. It can be understood that because this invention directly fills the molecular sieve powder into the rear acoustic cavity of the sound-generating device, compared to conventional methods of filling sound-absorbing particles, which require adhesives to bond multiple sound-absorbing powders together, the molecular sieve powder of this invention does not contain adhesives, resulting in a larger filling volume and better sound absorption effect for the same filling volume. For example, the silica-to-alumina ratio of the molecular sieve powder can be one of 190, 180, 170, 160, 150, 140, 130, 120, 110, 100, 90, 80, 70, 60, 50, 40, 30, 20, or 10, or any value satisfying the above range.

[0057] In some embodiments of this utility model, the sound-absorbing material 40 includes sound-absorbing particles, which are formed by bonding multiple porous raw powders and adhesives. It can be understood that traditional sound-absorbing particles can also be used as the sound-absorbing material 40 in this utility model.

[0058] In some embodiments of this utility model, the adhesive includes at least one of organic adhesives and inorganic adhesives.

[0059] In some embodiments of this utility model, the organic adhesive may be one or more of polyacrylates, polyurethanes, and silicones, but not limited to.

[0060] In some embodiments of this invention, the inorganic adhesive may be, but is not limited to, at least one of silicates, silica sols, aluminosilicates, phosphates, sulfates, and borates.

[0061] In some embodiments of this utility model, the porous raw powder can be, but is not limited to, activated carbon, silica, porous alumina, molecular sieve powder, metal-organic framework materials, aerogel, and COF, or one or more of these.

[0062] In some embodiments of this invention, the particle size of the sound-absorbing particles is 100μm to 600μm. This means that the particle size of the sound-absorbing particles has a wide range of applications, greatly improving particle utilization efficiency and reducing costs. The particle size of the sound-absorbing particles provided by this invention can be any value within the range of any two values ​​mentioned above, such as 100μm to 400μm, or 400μm to 600μm, and so on. Exemplarily, in embodiments of this invention, the particle size of the sound-absorbing particles can also be one of 100μm, 200μm, 300μm, 400μm, 500μm, and 600μm, or any value satisfying the above range.

[0063] In some embodiments of this utility model, the granulation method for sound-absorbing particles includes spray drying granulation, fluidized bed granulation, freeze drying granulation, stirring granulation, etc., which can be selected according to the actual situation.

[0064] In embodiments of this utility model, the sound-generating device 100 may be, but is not limited to, a loudspeaker.

[0065] The second aspect of this utility model provides an electronic device, the key feature of which is that it includes the sound-generating device 100 described in the first aspect.

[0066] In embodiments of this utility model, the electronic device may be, but is not limited to, a mobile phone, a tablet computer, a smartwatch, a game console, a learning machine, etc., and the electronic device has the characteristic of good acoustic effect.

[0067] Unless otherwise defined, the technical terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art to which this utility model pertains. Unless otherwise specified, the experimental reagents used in the following embodiments are all conventional biochemical reagents; the raw materials, instruments, and equipment used in the following embodiments can all be obtained through commercial purchase or by existing methods; the amounts of experimental reagents used are, unless otherwise specified, the amounts used in conventional experimental operations; and the experimental methods used are, unless otherwise specified, conventional methods. It should be further noted that the following description is merely exemplary and not a specific limitation of this utility model. Moreover, the selection of the comparative examples below is for comparison with the technical solutions of this application to demonstrate the advancement of the technical solutions of this application, and does not represent that the comparative examples are necessarily prior art in this technical field.

[0068] The structural dimensions of the sound-generating device in the embodiment are the same as those in the comparative example.

[0069] Example 1

[0070] A sound-generating device, see Figure 1 As shown, the sound-generating device 100 includes a housing 10 with an internal space, a sound-generating unit 20 and a breathable insulating member 30 disposed inside the housing 10. The sound-generating unit 20 cooperates with the housing 10 to define a front sound cavity and a rear sound cavity within its internal space. The breathable insulating member 30 is disposed in the rear sound cavity and cooperates with the housing 10 to isolate a sound-absorbing cavity in the rear sound cavity. The sound-absorbing cavity is filled with a sound-absorbing material 40.

[0071] The sound-absorbing material 40 is selected from ZSM-5 molecular sieve crystals. The average particle size D50 of the ZSM-5 molecular sieve crystals is 25μm, and the silicon-to-aluminum ratio of the ZSM-5 molecular sieve crystals is 130. Specifically, using a 0.2mL funnel measuring cup, 0.2mL of the sound-absorbing material is taken and filled into a 0.29mL sound-absorbing cavity.

[0072] The breathable insulating component 30 is a core-pore membrane, which serves as the encapsulation surface to seal the sound-absorbing material 40 within the sound-absorbing cavity. The core-pore membrane is made of PET, with a breathable micropore diameter of 11 μm and a pore density of 2 × 10⁻⁶. 5 The permeability of the nuclear pore membrane is 4000 L / m. 2 The nuclear pore membrane has a thickness of 13 μm and a tensile strength of 15 MPa. The membrane is applied at 20 mmH2O.

[0073] Example 2

[0074] A sound-generating device, see Figure 1 As shown, the sound-generating device 100 includes a housing 10 with an internal space, a sound-generating unit 20 and a breathable insulating member 30 disposed inside the housing 10. The sound-generating unit 20 cooperates with the housing 10 to define a front sound cavity and a rear sound cavity within its internal space. The breathable insulating member 30 is disposed in the rear sound cavity and cooperates with the housing 10 to isolate a sound-absorbing cavity in the rear sound cavity. The sound-absorbing cavity is filled with a sound-absorbing material 40.

[0075] The sound-absorbing material 40 is selected from sound-absorbing particles made of polyacrylate and ZSM-5 sieve crystals (particle size of 2μm), with a particle size of 200μm to 300μm. Specifically, a 0.2mL funnel measuring cup is used to take 0.2mL of sound-absorbing particles and fill it into a sound-absorbing cavity with a volume of 0.29mL.

[0076] The breathable insulating component 30 is a core-pore membrane, which serves as the encapsulation surface to seal the sound-absorbing material 40 within the sound-absorbing cavity. The core-pore membrane is made of PET, with a breathable micropore diameter of 11 μm and a pore density of 2 × 10⁻⁶. 5 The permeability of the nuclear pore membrane is 4000 L / m. 2 The nuclear pore membrane has a thickness of 13 μm and a tensile strength of 15 MPa. The membrane is applied at 20 mmH2O.

[0077] Comparative Example 1

[0078] A sound-generating device, the structure of which is the same as that of embodiment 2 in Comparative Example 1, except that the breathable insulating part 30 in Comparative Example 1 is made of woven mesh, and the woven mesh is used as the sealing surface to seal the sound-absorbing material 40 in the sound-absorbing cavity.

[0079] The woven mesh fabric is made of PET, with a pore size of 30μm and an air permeability of 4000L / m². 2 .S@20mmH2O.

[0080] Performance testing

[0081] 1. Acoustic performance evaluation

[0082] The Sound Check software was used to perform IMP (Impedance Measurement) tests on each sound-generating device in the examples and comparative examples to measure the resonant frequency F0 of the sound-generating devices.

[0083] Table 1. Summary of the acoustic performance of the sound-generating devices in the embodiments and comparative examples.

[0084]

[0085] As can be seen from the results in Table 1, the cavity resonant frequency F0 of the sound-generating device before filling the sound-absorbing material 40 in the embodiment and the comparative example are the same, indicating that the core-pore membrane in the embodiment and the woven mesh in the comparative example can meet the acoustic requirements.

[0086] Under the same filling volume, the resonant frequency F0 of the sound-generating device in Example 1 is slightly lower than that in Example 2 and Comparative Example 1. The main reason is that the sound-absorbing material 40 in Example 1 uses molecular sieve powder, which, compared to the sound-absorbing particles in Example 2 and Comparative Example 2, does not contain adhesive. Therefore, the effective sound-absorbing material 40 in Example 1 has a larger volume and better sound absorption effect. However, since adhesive is used in the preparation process of the sound-absorbing particles in Example 2 and Comparative Example 1, some pores will be blocked, resulting in a certain loss of acoustic performance.

[0087] 2. Drop test

[0088] Each sound-generating device in the examples and comparative examples was assembled into a 200g drop fixture, dropped from a height of 1m, with a rotation frequency of 20 times / min, and 600 drops. After the experiment, the products were disassembled, and the degree of powder contamination inside the acoustic cavity was observed.

[0089] Table 2. Powder contamination status of the rear acoustic cavity of the sound-generating device in the examples and comparative examples.

[0090] Example 1 Pollution-free Example 2 Pollution-free Comparative Example 1 Some of the granules were broken, and there was some powder contamination.

[0091] As can be seen from the results in Table 2, after the drop test, no powder leakage occurred in the embodiment, while in Comparative Example 1, some particles were broken and powder appeared, which adhered to the surface of the rear acoustic cavity shell 10 and the sound-generating unit 20. This indicates that the breathable isolation component 30 in this invention can effectively prevent the sound-absorbing material 40 and powder from entering the sound-generating unit 20, and can also ensure good breathability, so that the sound-absorbing material 40 can better play its sound absorption role and withstand more stringent reliability conditions.

[0092] The two experiments above clearly demonstrate that this invention uses a core-pore membrane to encapsulate molecular sieve particles, avoiding the use of adhesives and resulting in a better reduction in the resonant frequency F0 of the sound-generating device. At the same time, this invention can also use a core-pore membrane to encapsulate traditional sound-absorbing particles. Since the core-pore membrane has a smaller pore size than woven mesh, it provides better isolation and protection against particle shedding after reliability testing.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sound-generating device, characterized in that, It includes a housing with an internal space, and a sound-generating unit and a breathable insulating component disposed inside the housing. The sound-generating unit cooperates with the housing to define a front acoustic cavity and a rear acoustic cavity within its internal space, the rear acoustic cavity being filled with sound-absorbing material. The breathable insulating component is used to isolate the sound-absorbing material from the sound-generating unit. The breathable insulating component is a core-pore membrane, which includes a membrane body and a plurality of breathable micropores formed on the membrane body.

2. The sound-generating device as described in claim 1, characterized in that, The pore size of the breathable micropores is 5 μm to 20 μm; And / or, the pore density of the nuclear pore membrane is 0.9 × 10⁻⁶. 5 ~4×10 5 .

3. The sound-generating device as described in claim 1, characterized in that, The permeability of the nuclear pore membrane is 1000 L / m. 2 .S@20mmH2O~8000 L / m 2 .S@20 mmH2O.

4. The sound-generating device as claimed in claim 1, characterized in that, The thickness of the nuclear pore membrane is 2 μm to 20 μm; And / or, the tensile strength of the nuclear pore membrane is 5 MPa to 50 MPa.

5. The sound-generating device as described in claim 1, characterized in that, The membrane body is made of one of the following materials: polycarbonate, polyester, polypropylene, polyimide, polyvinylidene fluoride, and polytetrafluoroethylene.

6. The sound-generating device as claimed in claim 1, characterized in that, The breathable insulating component is disposed in the rear acoustic cavity and cooperates with the housing to isolate a sound-absorbing cavity in the rear acoustic cavity, and the sound-absorbing material is filled in the sound-absorbing cavity.

7. The sound-generating device as described in claim 6, characterized in that, The breathable insulating component is connected to the housing by any one of the following methods: bonding, hot melt sealing, or injection molding.

8. The sound-generating device as claimed in claim 1, characterized in that, The breathable insulating component covers the outer periphery of the sound-emitting unit to isolate the sound-emitting unit from the sound-absorbing material.

9. The sound-generating device as claimed in claim 1, characterized in that, The sound-absorbing material is molecular sieve powder, the average particle size D50 of the molecular sieve powder is 20 μm to 50 μm, and the silicon-to-aluminum ratio of the molecular sieve powder is <200.

10. The sound-generating device as claimed in claim 1, characterized in that, The sound-absorbing material includes sound-absorbing particles, which are formed by bonding multiple porous raw powders and adhesives.

11. The sound-generating device as claimed in claim 10, characterized in that, The adhesive is one of organic adhesives and inorganic adhesives; and / or, The porous raw powder is one of activated carbon, silica, porous alumina, molecular sieve powder, metal-organic framework material, aerogel, and COF.

12. The sound-generating device as claimed in claim 11, characterized in that, The organic adhesive is one of polyacrylate, polyurethane, or silicone; and / or, The inorganic adhesive is one of silicates, silica sols, aluminosilicates, phosphates, sulfates, and borates.

13. The sound-generating device as claimed in claim 10, characterized in that, The sound-absorbing particles have a particle size of 100 μm to 600 μm.

14. An electronic device, characterized in that, The sound-generating device includes any one of claims 1 to 13.

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