Sound production device and electronic device

Abstract

The application discloses a sound generating device and electronic equipment, and belongs to the field of acoustics. The sound generating device comprises a shell and a sound generating unit arranged in the shell. The sound generating unit divides the shell into a front sound cavity and a rear sound cavity. The rear sound cavity is provided with sound absorbing material. The sound absorbing material and the sound generating unit are separated by a breathable isolation mesh cloth. The breathable isolation mesh cloth is woven by organic polymer filaments. The filament diameter of the organic polymer filaments is less than or equal to 30 microns. The breathable isolation mesh cloth has breathable holes. The ratio of the filament diameter of the organic polymer filaments to the hole diameter of the breathable holes is greater than 0.8 and less than 3. The sound generating device can effectively intercept the sound absorbing material and improve the breathability of the breathable isolation mesh cloth.

Description

Technical Field

[0001] This invention relates to the field of acoustics, and more particularly to a sound-generating device and electronic device. Background Technology

[0002] In recent years, with the increasing thinness and lightness of electronic products, the space left for speakers in these products has become smaller and smaller. The rear cavity space of the speaker is severely compressed, resulting in a higher resonant frequency (F0), reduced low-frequency performance, and an impact on the user experience. Sound-absorbing particles can be filled into the rear acoustic cavity. The porous structure inside the sound-absorbing particles allows for rapid adsorption and desorption of gas in the rear cavity, virtually increasing the acoustic resonant space of the speaker's rear cavity, thereby reducing the speaker's F0 and improving low-frequency sensitivity.

[0003] The emergence of folding machines places more stringent requirements on the height of miniature speaker modules and makes their structure more extreme. When using sound-absorbing materials with smaller particle sizes, smaller mesh fabrics are needed to match them. However, the reduction in pore size leads to poorer air permeability of the mesh fabric, which in turn affects the sound absorption effect of the sound-absorbing material and thus affects the overall acoustic performance. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-generating device and electronic device, which aims to solve the technical problem of poor air permeability of the mesh fabric used in existing loudspeakers when paired with sound-absorbing materials.

[0005] To achieve the above objectives, the present invention provides a sound-generating device, comprising a housing and a sound-generating unit disposed within the housing. The sound-generating unit divides the housing into a front sound cavity and a rear sound cavity. The rear sound cavity is provided with a sound-absorbing material. The sound-absorbing material and the sound-generating unit are separated by a breathable insulating mesh. The breathable insulating mesh is woven from organic polymer filaments, wherein the diameter of the organic polymer filaments is ≤30μm, and the breathable insulating mesh has vent holes. The ratio of the diameter of the organic polymer filaments to the pore size of the vent holes is greater than 0.8 and less than 3.

[0006] In one embodiment, the air permeability of the breathable insulating mesh fabric at a pressure of 20 mmH2O is 1000-6200 L / m. 2 / s.

[0007] In one embodiment, the thickness of the breathable insulating mesh is greater than 35 μm and less than 50 μm.

[0008] In one embodiment, the breathable insulating mesh fabric is made of at least one of polyethylene terephthalate, polyethylene naphthalate, polypropylene, and polyetheretherketone.

[0009] In one embodiment, the change in pore size of the breathable insulating mesh after being exposed to 110°C for 500 hours is less than 6%.

[0010] In one embodiment, the sound-absorbing material includes sound-absorbing particles and / or molecular sieve powder particles, wherein the sound-absorbing particles include a plurality of molecular sieve powder particles, and the plurality of molecular sieve powder particles are bonded together into granular sound-absorbing particles by an adhesive.

[0011] In one embodiment, when the sound-absorbing material is molecular sieve powder, the pore size of the air-permeable pore is less than or equal to 20 μm.

[0012] In one embodiment, the sound-absorbing material is molecular sieve powder, wherein the average particle size of the molecular sieve powder is greater than 20 μm and less than 50 μm, and the silicon-to-aluminum mass ratio of the molecular sieve powder is less than 200.

[0013] And / or, the molecular sieve particles contain a porous structure with a pore size of 0.5-0.9 nm.

[0014] In one embodiment, the crystal structure of the molecular sieve powder includes at least one of the following types: MFI, MTW, FER, MOR, MEL, CHA, and LTL.

[0015] And / or, the crystal morphology of the molecular sieve particles includes spherical or cubic shapes.

[0016] In one embodiment, the breathable insulating mesh covers the outer surface of the sound-generating monomer;

[0017] Alternatively, the breathable insulating mesh is disposed in the rear acoustic cavity, and the breathable insulating mesh cooperates with the shell to divide the rear acoustic cavity into a first cavity and a second cavity, the sound-emitting unit is located in the first cavity, and the sound-absorbing material is disposed in the second cavity.

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

[0019] This invention provides a sound-generating device and an electronic device. The sound-generating device includes a housing and a sound-generating unit disposed within the housing. The sound-generating unit divides the housing into a front sound cavity and a rear sound cavity. Sound-absorbing material is disposed within the rear sound cavity. The sound-absorbing material and the sound-generating unit are separated by a breathable insulating mesh. The breathable insulating mesh is woven from organic polymer filaments, wherein the diameter of the organic polymer filaments is ≤30μm. The breathable insulating mesh has ventilated holes, and the ratio of the diameter of the organic polymer filaments to the pore size is greater than 0.8 and less than 3. The filament diameter of the organic polymer filaments is ≤30μm, resulting in a relatively thin breathable insulating mesh. This allows gas to pass through the mesh with a shorter distance, facilitating gas flow. Furthermore, the ratio of the filament diameter to the pore size is greater than 0.8 and less than 3, ensuring a suitable pore size that meets the requirements for sound absorption while also providing good breathability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments or related technologies of this drawing, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a planar schematic diagram of a breathable insulating mesh fabric provided in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a sound-generating device provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of another sound-generating device provided in an embodiment of the present invention;

[0024] Figure 4 The images show the IMP curves of the loudspeakers in Embodiment 1 and Comparative Example 1 of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100. Sound-generating device;

[0027] 110. Housing; 111. Rear acoustic cavity; 1111. First cavity; 1112. Second cavity;

[0028] 120. Sound-emitting unit; 130. Sound-absorbing material;

[0029] 140. Breathable insulating mesh fabric; 141. Organic polymer filaments; 142. Breathable holes.

[0030] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This invention provides a sound-generating device 100, including a housing 110 and a sound-generating unit 120 disposed within the housing 110. The sound-generating unit 120 divides the housing 110 into a front sound cavity and a rear sound cavity 111. The rear sound cavity 111 is provided with a sound-absorbing material 130. The sound-absorbing material 130 and the sound-generating unit 120 are separated by a breathable insulating mesh 140. The breathable insulating mesh 140 is woven from organic polymer filaments 141, wherein the diameter of the organic polymer filaments 141 is ≤30μm, and the breathable insulating mesh 140 has vent holes 142. The ratio of the diameter of the organic polymer filaments 141 to the pore size of the vent holes 142 is greater than 0.8 and less than 3.

[0033] Reference Figure 1 , Figure 1 This is a planar schematic diagram of a breathable insulating mesh fabric 140 provided in an embodiment of the present invention. In this embodiment, organic polymer filaments 141 are arranged alternately in the warp and weft directions to form a breathable insulating mesh fabric 140, which has a breathable hole 142 structure.

[0034] In this embodiment, the diameter of the organic polymer filament 141 is ≤30μm, for example, it can be 30μm, 27μm, 24μm, 22μm, 20μm, 19μm, etc. It is understood that if the filament diameter is greater than 30μm, the woven breathable insulating mesh 140 will be thicker, increasing the distance air needs to travel through it, thus reducing air permeability and failing to meet the requirements for use in the sound-generating device 100. If the filament diameter is less than or equal to 30μm, the woven mesh will be thinner, facilitating gas flow and increasing air permeability. Furthermore, in this embodiment, the ratio of the filament diameter of the organic polymer filament 141 to the pore size of the pores 142 is greater than 0.8 and less than 3. A ratio less than 0.8 indicates a larger pore size, making it difficult to intercept the smaller sound-absorbing material 130 particles; a ratio greater than 3 indicates a coarse filament diameter and a small pore size, resulting in insufficient air permeability. By setting the ratio of filament diameter to pore size within the aforementioned range, the breathable insulating mesh 140 can both intercept the sound-absorbing material 130 and possess good air permeability. Optionally, the ratio of the filament diameter of the organic polymer filament 141 to the pore size of the breathable pore 142 can be 0.9, 1, 1.2, 1.4, 1.6, 1.8, 2, 2.1, 2.3, 2.5, 2.7, 2.9, etc.

[0035] In some feasible implementations, the breathable insulating mesh fabric 140 has an air permeability of 1000-6200 L / m under a pressure of 20 mmH2O. 2 / s, for example, can be 1000L / m 2 / s、2000L / m 2 / s, 3000L / m 2 / s, 4000L / m 2 / s, 5000L / m 2 / s、6000L / m 2 / s、6200L / m 2 / s, etc. It's understandable that the air permeability is less than 1000 L / m². 2 A permeability of 6200 L / m² results in a higher acoustic impedance for the breathable insulating mesh fabric 140, affecting airflow efficiency and the sound absorption effect of the sound-absorbing material 130. This increases the F0 of the sound-generating device 100, negatively impacting low-frequency performance. 2 If the permeability is / s, then the pore size of the breathable micropores in the breathable insulating mesh 140 needs to be increased. However, if the pore size of the breathable micropores is too large, it will not be able to effectively intercept the sound-absorbing material 130. When the air permeability of the breathable insulating mesh 140 is within the above range, the sound-generating device 100 has good acoustic performance and can prevent the leakage of the sound-absorbing material 130.

[0036] In some feasible embodiments, the thickness of the breathable insulating mesh 140 is greater than 35 μm and less than 50 μm, for example, it can be 36 μm, 38 μm, 40 μm, 45 μm, 47 μm, 49 μm, etc. It is understood that the thickness of the breathable insulating mesh 140 is mainly determined by the diameter of the organic polymer filaments 141. The breathable insulating mesh 140 can be woven by overlapping filaments in both the warp and weft directions, so its thickness after weaving is comparable to the thickness of the diameter of two organic polymer filaments 141. Furthermore, it can undergo hot pressing after weaving, at which point the thickness of the breathable insulating mesh 140 will be reduced to a certain extent. The thickness of the breathable insulating mesh 140 affects its air permeability; the greater the thickness, the smaller the air permeability, thus affecting the sound absorption effect of the sound-absorbing material 130. By selecting the diameter of the organic polymer filament 141, the thickness of the breathable insulating mesh 140 can be controlled within the above range to obtain good breathability and avoid affecting the sound absorption effect of the sound-absorbing material 130.

[0037] In some feasible embodiments, the breathable insulating mesh 140 is made of at least one of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polypropylene (PP), and polyetheretherketone (PEEK). It is understood that these polymeric materials, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polypropylene (PP), and polyetheretherketone (PEEK), all possess good heat resistance and high mechanical strength. The resulting threads can be used as the weaving material for the breathable insulating mesh 140, providing it with good structural stability. PET material can be made into finer threads, while PEN, PP, and PEEK materials can produce thicker threads. Different types of threads can be selected as weaving materials based on requirements for thread diameter, mechanical strength, and temperature resistance.

[0038] In some feasible embodiments, the pore size change of the breathable insulating mesh 140 after being exposed to 110°C for 500 hours is less than 6%, for example, it can be 5%, 4%, 3%, 2%, 1%, 0.1%, 0%, etc. It is understood that when the sound-generating device 100 is in operation for a long time, the voice coil in the sound-generating unit 120 heats up, causing the temperature in the rear acoustic cavity 111 to exceed 100°C. High temperatures may affect the state of the organic polymer filaments, causing changes in the pore size of the breathable holes 142. The greater the pore size change, the worse the structural stability of the breathable insulating mesh 140. In this embodiment, even after 500 hours at high temperature, the pore size change of the breathable insulating mesh 140 is still less than 6%, which can prevent leakage of the sound-absorbing material 130 due to excessive pore size change. It has good high-temperature resistance and structural stability, thereby ensuring the normal operation of the sound-generating device 100 under high-temperature conditions.

[0039] In some feasible embodiments, the sound-absorbing material 130 includes sound-absorbing particles and / or molecular sieve powder particles, wherein the sound-absorbing particles include multiple molecular sieve powder particles, which are bonded together by an adhesive to form granular sound-absorbing particles. It is understood that both the sound-absorbing particles and the molecular sieve powder particles have a porous structure, enabling gas adsorption and desorption, and when used as the sound-absorbing material 130, they function as a virtual expansion. The molecular sieve powder particles have a smaller particle size, while the sound-absorbing particles have a larger particle size, allowing them to be used in conjunction with breathable insulating mesh fabrics 140 with different pore sizes.

[0040] In some feasible implementations, when the sound-absorbing material 130 is molecular sieve powder, the pore size of the air pores 142 is less than or equal to 20 μm, for example, it can be 20 μm, 18 μm, 17 μm, 16 μm, 15 μm, etc. It is understood that the organic polymer filaments 141 are arranged alternately in the warp and weft directions, forming the air pores 142 after weaving. If the pore size is greater than 20 μm, it will be impossible to effectively intercept the molecular sieve powder. Controlling the pore size of the air pores 142 to be less than or equal to 20 μm allows for effective interception of the molecular sieve powder while also meeting the requirements for air permeability.

[0041] In some feasible implementations, when the sound-absorbing material 130 is composed of sound-absorbing particles, the pore size of the vent 142 is greater than 20 μm, for example, it can be 22 μm, 25 μm, 30 μm, 35 μm, etc. It is understood that the sound-absorbing particles can be formed by bonding multiple molecular sieve particles together with a binder, and their particle size is larger than that of the molecular sieve particles. Therefore, the pore size of the vent 142 can be selected to be larger, which can still meet the requirements for intercepting sound-absorbing particles, while also making the weaving of the breathable insulating mesh 140 easier.

[0042] In some feasible embodiments, the sound-absorbing material 130 is molecular sieve powder, wherein the average particle size of the molecular sieve powder is greater than 20 μm and less than 50 μm, and the silicon-to-aluminum mass ratio of the molecular sieve powder is less than 200. It is understood that the selection of molecular sieve powder is compatible with the breathable insulating mesh 140. If its average particle size is less than 20 μm, it will leak from the breathable micropores of the breathable insulating mesh 140, contaminating the sound-generating unit 120, affecting the operation of the sound-generating unit 120, and leading to a decrease in the acoustic performance of the sound-generating device 100. Conversely, if the average particle size is greater than 50 μm, the internal channels of the molecular sieve powder are longer, preventing sound waves from penetrating too deeply. This renders the internal structural units of the molecular sieve powder ineffective, resulting in a decrease in the acoustic performance of the molecular sieve powder and failing to meet the acoustic application requirements in the sound-generating device 100. Because molecular sieve powder does not require binders, a larger amount of molecular sieve powder can be filled within the same filling volume. This allows for effective filling of the space within the rear acoustic cavity 111, fully utilizing its space and achieving a good virtual expansion effect. Molecular sieve powder with a silicon-to-aluminum mass ratio greater than 200 requires more or purer silicon source material, leading to increased raw material costs. Choosing molecular sieve powder with a silicon-to-aluminum mass ratio less than 200 allows for the use of relatively lower purity silicon source material, saving on raw material costs.

[0043] In some feasible embodiments, the molecular sieve particles contain a porous structure with a pore size of 0.5-0.9 nm, for example, 0.5 nm, 0.6 nm, 0.7 nm, 0.8 nm, 0.9 nm, etc. It is understood that if the pore size is too large, the adsorption-desorption efficiency of the molecular sieve particles for air molecules decreases, while if the pore size is too small, it will affect the adsorption-desorption capacity for air molecules. Within the aforementioned pore size range, effective adsorption and desorption of air molecules can be achieved, reducing the F0 of the sound-generating device 100 and providing good acoustic performance.

[0044] In some feasible embodiments, the crystalline structure of the molecular sieve particles includes at least one of the following types: MFI, MTW, FER, MOR, MEL, CHA, and LTL. Specifically, the basic structural units in the molecular sieve particles are silicon-oxygen tetrahedra and aluminum-oxygen tetrahedra, which are interconnected through oxygen atoms at their vertices to form secondary structural units. These secondary structural units are assembled in different ways to form different types of framework structures. The molecular sieve particles with the above-mentioned crystalline structures listed in this embodiment have different pore structures, which can adsorb and desorb gases, reducing the F0 of the sound-generating device 100. Among them, the MFI type molecular sieve particles have a three-dimensional pore structure with a moderate pore size, exhibiting superior acoustic performance compared to other crystalline types.

[0045] In some feasible implementations, the crystal morphology of the molecular sieve particles includes spherical or cubic shapes. Specifically, spherical and cubic molecular sieve particles have more regular shapes and more uniform particle size distribution, which is beneficial for achieving a higher packing density in the rear acoustic cavity 111 and increasing the filling amount of molecular sieve particles.

[0046] In some feasible implementations, refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a sound-generating device 100 provided in an embodiment of the present invention. The sound-generating device 100 includes a housing 110 and a sound-generating unit 120 disposed in the housing 110. A breathable insulating mesh 140 covers the outer surface of the sound-generating unit 120, isolating the magnetic circuit system inside the sound-generating unit 120 from the rear acoustic cavity 111 space. The sound-absorbing material 130 can fill almost the entire rear acoustic cavity 111 space.

[0047] In some feasible implementations, refer to Figure 3 , Figure 3 This is a schematic diagram of another sound-generating device 100 provided in an embodiment of the present invention. A breathable insulating mesh 140 is disposed in the rear acoustic cavity 111. The breathable insulating mesh 140 cooperates with the housing 110 to divide the rear acoustic cavity 111 into a first cavity 1111 and a second cavity 1112. The sound-generating unit 120 is located in the first cavity 1111, and the sound-absorbing material 130 is disposed in the second cavity 1112.

[0048] In this embodiment, the sound-generating device 100 includes a housing 110 and a sound-generating unit 120 disposed within the housing 110. The sound-generating unit 120 divides the housing 110 into a front sound cavity and a rear sound cavity 111. The rear sound cavity 111 is provided with a sound-absorbing material 130. The sound-absorbing material 130 and the sound-generating unit 120 are separated by a breathable insulating mesh 140. The breathable insulating mesh 140 is woven from organic polymer filaments 141, wherein the diameter of the organic polymer filaments 141 is ≤30μm, and the breathable insulating mesh 140 has vent holes 142. The ratio of the diameter of the organic polymer filaments 141 to the pore size of the vent holes 142 is greater than 0.8 and less than 3. The diameter of the organic polymer filament 141 is ≤30μm. The breathable insulation mesh 140 woven from it has a relatively thin thickness, and the distance that the gas needs to pass through the breathable insulation mesh 140 is small, which is conducive to the flow of gas. In addition, the ratio of the diameter of the organic polymer filament 141 to the pore size of the breathable pore 142 is greater than 0.8 and less than 3, which makes the pore size moderate, which can meet the requirements of sound-absorbing material 130 interception and also has good air permeability.

[0049] This invention also provides an electronic device, which includes the sound-generating device 100 as described in the above embodiments.

[0050] In this embodiment, the electronic devices include mobile phones, laptops, tablets, VR (Virtual Reality) devices, AR (Augmented Reality) devices, TWS (True Wireless Stereo) earphones, smart speakers, smart wearable devices, etc.

[0051] Compared with the prior art, the beneficial effects of the electronic device provided in the embodiments of the present invention are the same as those of the sound-generating device 100 in the above embodiments, and will not be repeated here.

[0052] The sound-generating device of the present invention will be described in detail below with specific embodiments and comparative examples. It is important to understand that the following description is merely exemplary and not intended to limit the scope of the invention. It should be noted that the comparative examples were chosen to demonstrate the technical advancement of the present invention and do not necessarily represent existing technology.

[0053] Example 1

[0054] Breathable insulating mesh fabric: Woven from PET yarns with a diameter of 21μm and a pore size of 12μm, the yarn diameter / pore size ratio is 1.75, the thickness is 40μm, and the air permeability is 2000L / m². 2 / s.

[0055] Sound-absorbing material: molecular sieve powder, specifically ZSM-5 molecular sieve powder with an average particle size of 37μm and a silicon-to-aluminum ratio of 158.

[0056] The breathable insulating mesh is wrapped around the outer surface of the sound-generating unit, and the above material is made into a loudspeaker. Molecular sieve powder particles are filled into the rear acoustic cavity.

[0057] Comparative Example 1

[0058] Breathable insulating mesh fabric: Woven from PET yarns with a diameter of 40μm and a pore size of 12μm, the yarn diameter / pore size ratio is 3.33, the thickness is 70μm, and the air permeability is 920L / m². 2 / s.

[0059] Sound-absorbing material: molecular sieve powder, specifically ZSM-5 molecular sieve powder with an average particle size of 37μm and a silicon-to-aluminum ratio of 158.

[0060] The breathable insulating mesh is wrapped around the outer surface of the sound-generating unit, and the above material is made into a loudspeaker. Molecular sieve powder particles are filled into the rear acoustic cavity.

[0061] It should be noted that the loudspeakers manufactured in Example 1 and Comparative Example 1 are of the same model. Experimental tests were conducted on the loudspeakers assembled in Example 1 and Comparative Example 1.

[0062] Acoustic performance comparison test: IMP (Impedance) tests were performed on the loudspeakers of Example 1 and Comparative Example 1, and the results were as follows: Figure 4 The IMP curves shown below, and the measured resonant frequency F0 of the loudspeaker, are shown in Table 1.

[0063] Table 1

[0064]

[0065] from Figure 4 As can be seen from the IMP curves, the impedance peak of the speaker in Example 1 is higher than that of the speaker in Comparative Example 1. One factor influencing the impedance peak is the resistance to airflow in the rear acoustic cavity. A higher impedance peak indicates lower airflow resistance in the rear acoustic cavity, corresponding to greater air permeability of the breathable mesh fabric. The higher impedance peak of the speaker in Example 1 corresponds to greater air permeability of the breathable mesh fabric in Example 1, resulting in better acoustic performance. While the mesh fabric in Comparative Example 1 has the same pore size as Example 1, its larger wire diameter leads to a larger ratio of wire diameter to pore size, resulting in greater distance between the pores and lower air permeability. This has a certain suppressive effect on the impedance peak, resulting in a poorer performance.

[0066] Analysis of the data in Table 1 shows that, with the same pore size, the filament diameter of the mesh fabric in Example 1 is 21 μm, while that in Comparative Example 1 is 40 μm. The resulting breathable mesh fabric thicknesses are 40 μm and 70 μm, respectively. This difference in thickness leads to a significant difference in air permeability, with Example 1 showing 2000 L / m². 2 / s, Comparative Example 1 is 920L / m 2 / s. After being assembled into loudspeakers, the loudspeaker F0 of Example 1 was 620Hz, while the loudspeaker of Comparative Example 1, with the same amount of molecular sieve powder filling, had an F0 of 670Hz, which was 50Hz higher. This indicates that the breathable insulating mesh of Example 1 has a suitable ratio of wire diameter to pore size, resulting in greater air permeability and meeting the requirements of the loudspeaker's rear acoustic cavity for intercepting molecular sieve powder.

[0067] Power life test: Under normal temperature conditions, the loudspeakers of Example 1 and Comparative Example 1 were set to a voltage of 3.46V and fed with a white noise signal, and operated continuously for 96 hours. After the experiment, the resonant frequency F0 of each loudspeaker was measured, and the powder contamination of the rear cavity was observed after disassembling the loudspeakers. The test results are shown in Table 2 below.

[0068] Table 2

[0069]

[0070] The results in Table 2 show that after the loudspeaker experiments in Example 1 and Comparative Example 1, no broken powder or powder leakage was found during disassembly. This indicates that the mesh fabric used in Example 1 and Comparative Example 1 has a good ability to intercept molecular sieve particles and can meet the acoustic reliability test requirements of the loudspeaker.

[0071] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A sound-generating device, characterized in that, The device includes a housing and a sound-generating unit disposed within the housing. The sound-generating unit divides the housing into a front acoustic cavity and a rear acoustic cavity. The rear acoustic cavity contains a sound-absorbing material. The sound-absorbing material and the sound-generating unit are separated by a breathable insulating mesh. The breathable insulating mesh is woven from organic polymer filaments, wherein the diameter of the organic polymer filaments is ≤30μm, the breathable insulating mesh has air pores, and the ratio of the diameter of the organic polymer filaments to the diameter of the air pores is greater than 0.8 and less than 3. The change in pore size of the breathable insulating mesh after being exposed to 110°C for 500 hours is less than 6%.

2. The sound-generating device as described in claim 1, characterized in that, The breathable insulation mesh has an air permeability of 1000-6200 L / m under a pressure of 20 mmH2O. 2 / s.

3. The sound-generating device as described in claim 1, characterized in that, The thickness of the breathable insulating mesh is greater than 35 μm and less than 50 μm.

4. The sound-generating device as described in claim 1, characterized in that, The breathable insulating mesh fabric is made of at least one of polyethylene terephthalate, polyethylene naphthalate, polypropylene, and polyetheretherketone.

5. The sound-generating device as described in claim 1, characterized in that, The sound-absorbing material includes sound-absorbing particles and / or molecular sieve powder particles, wherein the sound-absorbing particles include multiple molecular sieve powder particles, and the multiple molecular sieve powder particles are bonded together into granular sound-absorbing particles by an adhesive.

6. The sound-generating device as described in claim 5, characterized in that, When the sound-absorbing material is molecular sieve powder, the pore size of the air-permeable pore is less than or equal to 20 μm.

7. The sound-generating device as claimed in claim 1, characterized in that, The sound-absorbing material is molecular sieve powder, wherein the average particle size of the molecular sieve powder is greater than 20 μm and less than 50 μm, and the silicon-aluminum mass ratio of the molecular sieve powder is less than 200. And / or, the molecular sieve particles contain a porous structure with a pore size of 0.5-0.9 nm.

8. The sound-generating device as claimed in claim 7, characterized in that, The crystalline structure of the molecular sieve particles includes at least one of the following types: MFI, MTW, FER, MOR, MEL, CHA, and LTL. And / or, the crystal morphology of the molecular sieve particles includes spherical or cubic shapes.

9. The sound-generating device as claimed in claim 1, characterized in that, The breathable insulating mesh fabric covers the outer surface of the sound-generating unit; Alternatively, the breathable insulating mesh is disposed in the rear acoustic cavity, and the breathable insulating mesh cooperates with the shell to divide the rear acoustic cavity into a first cavity and a second cavity, the sound-emitting unit is located in the first cavity, and the sound-absorbing material is disposed in the second cavity.

10. An electronic device, characterized in that, Includes the sound-generating device as described in any one of claims 1 to 9.

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