Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and belongs to the acoustics field, the sound production device comprises a shell and a sound production monomer arranged in the shell, the sound production monomer divides the shell into a front sound cavity and a rear sound cavity, a sound absorption material is arranged in the rear sound cavity, and the sound absorption material and the sound production monomer are isolated by a breathable isolation mesh cloth; the breathable isolation screen cloth is formed by weaving organic polymer filaments, the organic polymer filaments comprise first fiber filaments and second fiber filaments, the cross sections of the first fiber filaments are round, the cross sections of the second fiber filaments are polygonal, and the second fiber filaments account for 5%-30% of the total number of the organic polymer filaments. The contact points of the first fibers and the second fibers are subjected to hot pressing treatment. The air permeability of the air-permeable isolation mesh cloth can be improved while the sound-absorbing material is effectively intercepted.

Description

Technical Field

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

[0002] In recent years, as electronic products have become increasingly thinner and lighter, the space left for speakers within these products has become increasingly smaller. This has severely compressed the speaker's rear cavity, resulting in a higher resonant frequency (F0) and poor low-frequency performance, impacting the user experience. By filling the rear acoustic cavity with sound-absorbing particles, the pore structure within the particles rapidly adsorbs and desorbs the gas in the rear cavity, virtually increasing the speaker's acoustic rear cavity resonance space, thereby lowering the speaker's F0 and improving low-frequency sensitivity.

[0003] The advent of folding machines has placed even stricter requirements on the height and structure of micro-speaker modules. Using sound-absorbing materials in combination with corresponding woven meshes can effectively fill small spaces. To intercept the sound-absorbing materials, the woven meshes need to have smaller pores. However, reducing the pore size to a certain extent will affect the mesh's breathability. Summary of the Invention

[0004] The main purpose of the present invention is to provide a sound-generating device and an electronic device, aiming to solve the technical problem of poor air permeability caused by the small pore size of the mesh cloth in the existing speakers.

[0005] To achieve the above-mentioned purpose, the present invention provides a sound-emitting device, comprising a shell and a sound-emitting unit arranged in the shell, the sound-emitting unit divides the shell 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-emitting unit are isolated by a breathable isolation mesh, and the breathable isolation mesh is woven from organic polymer yarns, wherein the organic polymer yarns include first fiber yarns and second fiber yarns, the cross-section of the first fiber yarns is circular, the cross-section of the second fiber yarns is polygonal, the second fiber yarns account for 5%-30% of the total number of fiber yarns of the organic polymer yarns, and the contact points of the first fiber yarns and the second fiber yarns are hot-pressed.

[0006] In one embodiment, the material of the organic polymer filaments includes at least one of polyethylene terephthalate, polyethylene naphthalate, polypropylene, and polyetheretherketone.

[0007] In one embodiment, the cross-sectional shape of the second fiber filament includes at least one of a triangle, a five-star shape, a five-leaf shape, a pentagon, a hexagon, and a branch shape.

[0008] In one embodiment, the tensile strength of the breathable isolation mesh is greater than 400 N / 5 cm and less than 1000 N / 5 cm.

[0009] In one embodiment, the air permeability of the breathable isolation mesh at a pressure of 20 mmH2O is 1000-7000 L / m 2 / s.

[0010] In one embodiment, the breathable isolation mesh has a thickness of less than 100 μm.

[0011] In one embodiment, the pore size change of the breathable isolation mesh after being exposed to a temperature of 110° C. for 500 hours is less than 6%.

[0012] 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 into the granular sound-absorbing particles by a binder.

[0013] In one embodiment, the sound absorbing material is molecular sieve powder particles, the average particle size of the molecular sieve powder particles is greater than 20 μm and less than 50 μm, and the silicon to aluminum mass ratio of the molecular sieve powder particles is less than 200.

[0014] In one embodiment, the breathable isolation mesh has breathable micropores, and the pore size of the breathable micropores is less than 20 μm.

[0015] In one embodiment, the crystal structure of the molecular sieve powder includes at least one of MFI, MTW, FER, MOR, MEL, CHA, and LTL types;

[0016] And / or, the crystal morphology of the molecular sieve powder particles includes spherical or square shapes.

[0017] In one embodiment, the molecular sieve powder comprises a pore structure, and the pore size of the pore structure is 0.5-0.9 nm.

[0018] In one embodiment, the breathable isolation mesh is coated on the outer surface of the sound-emitting unit;

[0019] Alternatively, the breathable isolation mesh is arranged in the rear sound cavity, and the breathable isolation mesh and the shell cooperate to separate the rear sound 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 arranged in the second cavity.

[0020] The present invention also provides an electronic device comprising the sound-generating device as described above.

[0021] The present invention provides a sound-emitting device and an electronic device. The sound-emitting device includes a shell and a sound-emitting unit arranged in the shell. The sound-emitting unit divides the shell 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-emitting unit are isolated by a breathable isolation mesh. The breathable isolation mesh is woven from organic polymer yarns, wherein the organic polymer yarns include first fiber yarns and second fiber yarns. The cross-section of the first fiber yarn is circular, and the cross-section of the second fiber yarn is polygonal. The second fiber yarn accounts for 5%-30% of the total number of fiber yarns of the organic polymer yarns. The contact points of the first fiber yarn and the second fiber yarn are hot-pressed. The breathable isolation mesh cloth of the embodiment of the present invention is woven with first fiber filaments and second fiber filaments with different cross-sectional shapes. Due to the presence of sharp corners in the second fiber filaments with polygonal cross-sections, and the second fiber filaments occupying 5%-30% of the total number of fiber filaments, compared with the mesh cloth woven entirely with cylindrical fiber filaments with circular cross-sections, the irregularity of the shape of the formed breathable micropores increases, and the gas passing through the breathable micropores will produce more disturbances and diversions, and the air permeability increases. In addition, the contact points of the first fiber filaments and the second fiber filaments are treated with hot pressing to fix the aperture of the breathable micropores, effectively intercept the sound-absorbing material, and have a good encapsulation effect on the molecular sieve powder particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 A cross-sectional view of a breathable isolation mesh provided by an embodiment of the present invention;

[0024] Figure 2 A schematic structural diagram of a sound-generating device provided by an embodiment of the present invention;

[0025] Figure 3 A schematic structural diagram of another sound-generating device provided by an embodiment of the present invention;

[0026] Figure 4 1-2 and the comparative example 1 of the present invention.

[0027] Description of reference numerals:

[0028] 100. Sound-generating device;

[0029] 110, housing; 111, rear acoustic cavity; 1111, first cavity; 1112, second cavity;

[0030] 120, sound-emitting unit; 130, sound-absorbing material;

[0031] 140. Breathable isolation mesh; 141. First fiber filament; 142. Second fiber filament.

[0032] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0033] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] An embodiment of the present invention provides a sound-emitting device 100, comprising a shell 110 and a sound-emitting unit 120 arranged in the shell 110. The sound-emitting unit 120 divides the shell 110 into a front sound cavity and a rear sound cavity 111. A sound-absorbing material 130 is provided in the rear sound cavity 111. The sound-absorbing material 130 and the sound-emitting unit 120 are separated by a breathable isolation mesh 140. The breathable isolation mesh 140 is woven from organic polymer yarns, wherein the organic polymer yarns include first fiber yarns 141 and second fiber yarns 142. The cross-section of the first fiber yarn 141 is circular, and the cross-section of the second fiber yarn 142 is polygonal. The second fiber yarn 142 accounts for 5%-30% of the total number of organic polymer yarns. The contact points of the first fiber yarn 141 and the second fiber yarn 142 are hot-pressed.

[0035] Reference Figure 1 , Figure 1 1 is a cross-sectional view of a breathable isolation mesh 140 provided in an embodiment of the present invention. Figure 1 As shown, the organic polymer filaments include a first fiber filament 141 with a circular cross section and a second fiber filament 142 with a polygonal cross section, which are alternately arranged in the warp and weft directions to weave into a breathable isolation mesh 140. It can be understood that the axial cross sections of the first fiber filament 141 and the second fiber filament 142 are both rectangular. Figure 1 The figure also shows different cross-sectional shapes of the yarn, as well as a rectangular axial cross-section. The contact points of the first fiber filament 141 and the second fiber filament 142 are heat-pressed to bond the first fiber filament 141 and the second fiber filament 142 at the contact points, thereby fixing the aperture of the breathable micropores.

[0036] In this embodiment, the second fiber filaments 142 account for 5% to 30% of the total number of organic polymer filaments, for example, 5%, 10%, 15%, 20%, 25%, 30%, etc. It is understood that if the proportion of the second fiber filaments 142 to the total number of filaments is less than 5%, the improvement in the air permeability of the breathable isolation mesh 140 will be insignificant, while if the proportion is greater than 30%, the breathable isolation mesh 140 will become too fluffy, affecting its tensile strength. Controlling the proportion of the second fiber filaments 142 to the total number of organic polymer filaments within an appropriate range can ensure both air permeability and high tensile strength.

[0037] In some feasible embodiments, the material of the organic polymer filaments includes at least one of polyethylene terephthalate, polyethylene naphthalate, polypropylene, and polyetheretherketone. It is understandable that polymer materials such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polypropylene (PP), and polyetheretherketone (PEEK) all have good heat resistance and high mechanical strength, and the silk threads made from them can be used as the weaving material of the breathable isolation mesh 140, providing good structural stability for the breathable isolation mesh 140. Among them, PET material can be made into silk threads with a relatively fine wire diameter, while silk threads made from PEN, PP, and PEEK materials have a relatively thick wire diameter. Different types of silk threads can be selected as weaving materials based on the requirements for wire diameter, mechanical strength, temperature resistance, etc.

[0038] In some feasible embodiments, the cross-sectional shape of the second fiber filaments 142 includes at least one of a triangle, a five-star shape, a five-lobed shape, a pentagon, a hexagon, and a branch shape. Specifically, these polygonal shapes all have sharp corners, which reduces the contact and fit between the fibers after mixed weaving, increases the irregularity of the shape of the breathable micropores, and thus improves the air permeability of the breathable isolation mesh 140.

[0039] In some feasible embodiments, the tensile strength of the breathable isolation mesh 140 is greater than 400 N / 5 cm and less than 1000 N / 5 cm. For example, it can be 410 N / 5 cm, 450 N / 5 cm, 500 N / 5 cm, 600 N / 5 cm, 700 N / 5 cm, 800 N / 5 cm, 900 N / 5 cm, 980 N / 5 cm, etc. It is understood that a tensile strength greater than 400 N / 5 cm allows the breathable isolation mesh 140 to better cope with the various harsh environmental conditions that the sound-generating device 100 may face. However, a tensile strength of 1000 N / 5 cm or more is difficult to achieve with organic polymer filaments. Therefore, the tensile strength of the breathable isolation mesh 140 of this embodiment can meet the application requirements of the sound-generating device 100.

[0040] In some feasible embodiments, the air permeability of the air permeable isolation mesh 140 at a pressure of 20 mmH2O is 1000-7000 L / m 2 / s, for example, it 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、7000L / m 2 / s, etc. It is understandable that the air permeability is less than 1000L / m 2 / s, will lead to a larger acoustic resistance of the breathable isolation mesh 140, affecting the flow efficiency of the airflow, causing the F0 of the sound-generating device 100 to increase, and having a negative impact on the low-frequency performance. 2 / s, the pore size of the air permeable isolation mesh 140 needs to be increased. However, if the pore size is too large, the sound-absorbing material 130 cannot be effectively intercepted. When the air permeability of the air permeable isolation mesh 140 is within the above range, the sound-generating device 100 has good acoustic performance and can prevent leakage of the sound-absorbing material 130.

[0041] In some feasible embodiments, the thickness of the breathable isolation mesh 140 is less than 100 μm, for example, 98 μm, 90 μm, 80 μm, 70 μm, 60 μm, 50 μm, etc. It is understood that the thickness of the breathable isolation mesh 140 affects its air permeability. The thicker the mesh, the worse the air permeability. A thickness above 100 μm results in very low air permeability and low airflow efficiency, which increases the F0 of the sound-generating device 100 and results in poor low-frequency performance. Keeping the thickness of the breathable isolation mesh 140 below 100 μm facilitates rapid airflow and provides good acoustic performance for the sound-generating device 100.

[0042] In some feasible embodiments, the pore size change of the breathable isolation mesh 140 after being exposed to a temperature of 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. This high temperature may affect the state of the organic polymer filaments, resulting in pore size changes. The greater the pore size change, the worse the structural stability of the breathable isolation mesh 140. The breathable isolation mesh 140 of this embodiment maintains a pore size change of less than 6% even after 500 hours of high temperature exposure. This prevents leakage of the sound-absorbing material 130 caused by excessive pore size changes, and exhibits excellent high-temperature resistance and structural stability.

[0043] In some feasible embodiments, the sound-absorbing material 130 includes sound-absorbing particles and / or molecular sieve powder particles. The sound-absorbing particles include multiple molecular sieve powder particles bonded together with a binder 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 that allows for gas adsorption and desorption, thus acting as a virtual volume expansion for the sound-absorbing material 130. 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 isolation mesh 140 of varying pore sizes.

[0044] In some feasible embodiments, the sound-absorbing material 130 is a molecular sieve powder, 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. It is understandable that the selection of the molecular sieve powder is compatible with the breathable isolation mesh 140. If its average particle size is less than 20 μm, it will leak from the breathable micropores of the breathable isolation mesh 140, contaminating the sound-emitting monomer 120, affecting the operation of the sound-emitting monomer 120, and causing a decrease in the acoustic performance of the sound-emitting device 100. If the average particle size is greater than 50 μm, the pores inside the molecular sieve powder are longer, and the sound waves cannot penetrate too deep, thereby rendering the structural units inside the molecular sieve powder ineffective, the acoustic performance of the molecular sieve powder is reduced, and the acoustic application requirements in the sound-emitting device 100 cannot be met. Because molecular sieve powder particles do not require a binder to bond, they can be filled in larger quantities under the same filling volume, effectively filling the rear acoustic cavity 111 and fully utilizing the space in the rear acoustic cavity 111 to achieve a good virtual expansion effect of the rear acoustic cavity 111. Molecular sieve powder particles with a silicon-to-aluminum mass ratio greater than 200 require the use of more or purer silicon source materials, resulting in increased raw material costs. Selecting molecular sieve powder particles with a silicon-to-aluminum mass ratio less than 200 allows the use of relatively lower-purity silicon source materials, saving raw material costs.

[0045] In some feasible embodiments, the breathable isolation mesh 140 has breathable micropores, and the pore size of the breathable micropores is less than 20 μm, for example, it can be 18 μm, 17 μm, 16 μm, 15 μm, etc. It can be understood that the first fiber filaments 141 and the second fiber filaments 142 are arranged alternately in the warp and weft directions, and breathable micropores are formed after weaving. Due to the difference in the cross-sectional shape of the two organic polymer filaments, the shape of the breathable micropores may not be regular, and the pore size can be the average value or maximum value in each direction. If the pore size is greater than 20 μm, it will not be able to effectively intercept the molecular sieve powder particles. Controlling the pore size of the breathable micropores 143 to be less than 20 μm can effectively intercept the molecular sieve powder particles while also meeting the air permeability requirements.

[0046] In some feasible embodiments, the crystal structure of the molecular sieve powder includes at least one of MFI, MTW, FER, MOR, MEL, CHA, and LTL types. Specifically, the basic structural units in the molecular sieve powder are silicon oxide tetrahedrons and aluminum oxide tetrahedrons, which are interconnected through oxygen atoms at the vertices to form secondary structural units. These secondary structural units are spliced in different ways to form different types of skeleton structures. The molecular sieve powders of the above-mentioned crystal structures listed in this embodiment have different pore structures, can adsorb and desorb gases, and reduce the F0 of the sound-generating device 100. Among them, the MFI type molecular sieve powder has a three-dimensional pore structure, and the pore size of its internal structure is moderate, and has better acoustic performance than other crystal types.

[0047] In some feasible embodiments, the crystal morphology of the molecular sieve powder particles includes spherical or square shapes. Specifically, spherical and square molecular sieve powder particles have a relatively regular shape and a relatively uniform particle size distribution, which is conducive to achieving a higher packing density in the rear acoustic cavity 111 and increasing the filling amount of the molecular sieve powder particles.

[0048] In some feasible embodiments, the molecular sieve powder particles include a pore structure, and the pore structure has 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 understandable that if the pore size is too large, the adsorption and desorption efficiency of the molecular sieve powder particles on gas molecules in the air will be reduced, while if the pore size is too small, the adsorption and desorption capacity of gas molecules will be affected. Within the above pore size range, gas molecules in the air can be effectively adsorbed and desorbed, the F0 of the sound-generating device 100 can be reduced, and good acoustic performance can be provided.

[0049] In some possible implementations, reference Figure 2 , Figure 2 This is a structural schematic diagram of a sound-emitting device 100 provided in an embodiment of the present invention. The sound-emitting device 100 includes a shell 110 and a sound-emitting unit 120 arranged in the shell 110. A breathable isolation mesh 140 is covered on the outer surface of the sound-emitting unit 110 to isolate the magnetic circuit system inside the sound-emitting unit 120 from the space of the rear sound cavity 111. The sound-absorbing material 130 can be filled in almost the entire space of the rear sound cavity 111.

[0050] In some possible implementations, reference Figure 3 , Figure 3 A schematic structural diagram of another sound-emitting device 100 provided in an embodiment of the present invention, wherein a breathable isolation mesh 140 is arranged in the rear sound cavity 111, and the breathable isolation mesh 140 cooperates with the shell 110 to separate the rear sound cavity 111 into a first cavity 1111 and a second cavity 1112, the sound-emitting unit 120 is located in the first cavity 1111, and the sound-absorbing material 130 is arranged in the second cavity 1112.

[0051] In this embodiment, the sound-emitting device 100 includes a shell 110 and a sound-emitting unit 120 arranged in the shell 110. The sound-emitting unit 120 divides the shell 110 into a front sound cavity and a rear sound cavity 111. A sound-absorbing material 130 is provided in the rear sound cavity 111. The sound-absorbing material 130 and the sound-emitting unit 120 are separated by a breathable isolation mesh 140. The breathable isolation mesh 140 is woven from organic polymer yarns, wherein the organic polymer yarns include first fiber yarns 141 and second fiber yarns 142. The cross-section of the first fiber yarn 141 is circular, and the cross-section of the second fiber yarn 142 is polygonal. The second fiber yarn 142 accounts for 5%-30% of the total number of organic polymer yarns. The contact points of the first fiber yarn 141 and the second fiber yarn 142 are hot-pressed. The breathable isolation mesh 140 of the embodiment of the present invention is woven with first fiber filaments 141 and second fiber filaments 142 with different cross-sectional shapes. Due to the presence of sharp corners in the second fiber filaments 142 with polygonal cross-sections, and the second fiber filaments 142 occupying 5%-30% of the total number of fiber filaments, compared with the mesh woven entirely with cylindrical fiber filaments with circular cross-sections, the shape irregularity of the formed breathable micropores increases, and the gas passing through the breathable micropores will produce more disturbances and diversions, and the air permeability increases. In addition, the contact points of the first fiber filaments 141 and the second fiber filaments 142 are subjected to hot pressing treatment to fix the pore size of the breathable micropores, thereby effectively intercepting the sound-absorbing material 130.

[0052] An embodiment of the present invention further provides an electronic device, which includes the sound-generating device 100 described in the above embodiment.

[0053] In this embodiment, the electronic devices include mobile phones, laptops, tablet computers, VR (Virtual Reality) devices, AR (Augmented Reality) devices, TWS (True Wireless Stereo) headphones, smart speakers, smart wearable devices, etc.

[0054] 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, and are not described in detail here.

[0055] The following describes the sound-generating device 100 of the present invention in detail using specific embodiments and comparative examples. It should be understood that the following description is merely illustrative and does not limit the present invention. It should be noted that the comparative examples are selected to demonstrate the technological advancement of the present invention and do not necessarily represent the prior art.

[0056] Example 1

[0057] Breathable isolation mesh: It is woven with a first fiber (90%) with a circular cross section and a second fiber (10%) with a pentagonal cross section, with a pore size of 15μm and an air permeability of 3130L / m 2 / s.

[0058] Sound-absorbing material: ZSM-5 molecular sieve powder with an average particle size of 23 μm and a silicon-aluminum ratio of 160.

[0059] The breathable isolation mesh is wrapped on the outer surface of the sound-generating unit, and the molecular sieve powder is filled into the rear sound cavity with a filling volume of 0.31 ml to make a speaker.

[0060] Example 2

[0061] Breathable isolation mesh: a mixture of a first fiber with a circular cross section (90%) and a second fiber with a pentagonal cross section (10%), with a pore size of 10 μm and an air permeability of 2000 L / m 2 / s.

[0062] Sound-absorbing material: ZSM-5 molecular sieve powder with an average particle size of 23 μm and a silicon-aluminum ratio of 160.

[0063] The breathable isolation mesh is wrapped on the outer surface of the sound-generating unit, and the molecular sieve powder is filled into the rear sound cavity with a filling volume of 0.31 ml to make a speaker.

[0064] Comparative Example 1

[0065] Breathable isolation mesh: all woven with first fiber yarn with a circular cross section, pore size 15μm, air permeability 1980L / m 2 / s.

[0066] Sound-absorbing material: ZSM-5 molecular sieve powder with an average particle size of 23 μm and a silicon-aluminum ratio of 160.

[0067] The breathable isolation mesh is wrapped on the outer surface of the sound-generating unit, and the molecular sieve powder is filled into the rear sound cavity with a filling volume of 0.31 ml to make a speaker.

[0068] It should be noted that the loudspeakers manufactured in the above Examples 1-2 and Comparative Example 1 are all of the same model. Experimental tests were conducted on the loudspeakers assembled in Examples 1-2 and Comparative Example 1.

[0069] Acoustic performance verification: The speakers of Examples 1-2 and Comparative Example 1 were tested for IMP (Impedance) and the following results were obtained: Figure 4 The IMP curve shown in the figure is used to measure the resonant frequency F0 of the loudspeaker and is shown in Table 1 below.

[0070] Table 1

[0071]

[0072] from Figure 4 It can be seen from the IMP curve that the impedance peak of the speaker in Example 1 is the highest, and the impedance peak of the speaker in Example 2 is slightly higher than that of the speaker in Comparative Example 1. The height of the impedance peak is affected by the resistance to the airflow in the rear acoustic cavity. The higher the impedance peak, the smaller the resistance to the airflow in the rear cavity, which corresponds to a greater air permeability of the mesh. The speaker in Example 1 has the highest impedance peak and has the best acoustic effect. From the data analysis in Table 1, it can be seen that when compared with Comparative Example 1, under the condition of the same pore size, the mesh in Example 1 mixed with pentagonal wires has a higher air permeability and a lower F0 of the speaker. When compared with Comparative Example 1, when the difference in air permeability is very small, the mesh in Example 2 mixed with pentagonal wires has a smaller pore size. It can be seen that after mixing the silk threads with polygonal cross-sections, the breathable isolation mesh can achieve higher air permeability at the same pore size, and obtain better use effect in the speaker. Under the condition of the same air permeability, the pore size can be made smaller, which is more beneficial for the interception of small-particle molecular sieve powder particles, and the particle size range of the selectable molecular sieve powder particles is wider.

[0073] Room-Temperature BFPP Experiment: At room temperature, the voltage was set at 2.8V. The speakers of Examples 1-2 and Comparative Example 1 were fed with a BFPP signal and operated continuously for 48 hours. After the experiment, the resonant frequency F0 of each speaker group was measured. The speakers were disassembled and observed for powder contamination in the acoustic cavity. The results are shown in Table 2 below.

[0074] Table 2

[0075]

[0076] From the analysis of the results in Table 2, it can be seen that after the speakers of Examples 1-2 and Comparative Example 1 were disassembled, there was no powder breakage or leakage, indicating that the mesh cloth mixed with polygonal mesh wires used in Examples 1 and 2 also has a good ability to intercept molecular sieve powder particles and can withstand the acoustic reliability test of the speaker.

[0077] 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 description 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-generating device, characterized in that: It includes a shell and a sound-emitting unit arranged in the shell, the sound-emitting unit divides the shell 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-emitting unit are isolated by a breathable isolation mesh, and the breathable isolation mesh is woven from organic polymer yarns, wherein the organic polymer yarns include first fiber yarns and second fiber yarns, the cross-section of the first fiber yarns is circular, the cross-section of the second fiber yarns is polygonal, the second fiber yarns account for 5%-30% of the total number of fiber yarns of the organic polymer yarns, and the contact points of the first fiber yarns and the second fiber yarns are hot-pressed.

2. The sound-generating device according to claim 1, wherein: The material of the organic polymer filaments includes at least one of polyethylene terephthalate, polyethylene naphthalate, polypropylene, and polyetheretherketone.

3. The sound-generating device according to claim 1, wherein: The cross-sectional shape of the second fiber filament includes at least one of a triangle, a five-star shape, a five-leaf shape, a pentagon, a hexagon, and a branch shape.

4. The sound-generating device according to claim 1, wherein: The tensile strength of the breathable isolation mesh is greater than 400N / 5cm and less than 1000N / 5cm.

5. The sound-generating device according to claim 1, wherein: The air permeability of the breathable isolation mesh at a pressure of 20 mmH2O is 1000-7000 L / m 2 / s.

6. The sound-generating device according to claim 1, wherein: The thickness of the breathable isolation mesh is less than 100 μm.

7. The sound-generating device according to claim 1, wherein: The pore size change of the breathable isolation mesh after being exposed to a temperature of 110° C. for 500 hours is less than 6%.

8. The sound-generating device according to claim 1, wherein: 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 into the granular sound-absorbing particles by a binder.

9. The sound-generating device according to claim 1, wherein: The sound-absorbing material is molecular sieve powder particles, the average particle size of the molecular sieve powder particles is greater than 20 μm and less than 50 μm, and the silicon-aluminum mass ratio of the molecular sieve powder particles is less than 200.

10. The sound-generating device according to claim 9, wherein: The breathable isolation mesh of the molecular sieve powder particles has breathable micropores, and the pore size of the breathable micropores is less than 20 μm.

11. The sound generating device according to claim 9, wherein: The crystal structure of the molecular sieve powder particles includes at least one of MFI, MTW, FER, MOR, MEL, CHA, and LTL types; And / or, the crystal morphology of the molecular sieve powder particles includes spherical or square shapes.

12. The sound-generating device according to claim 9, wherein: The molecular sieve powder particles include a pore structure, and the pore diameter of the pore structure is 0.5-0.9 nm.

13. The sound-generating device according to claim 1, wherein: The breathable isolation mesh is covered on the outer surface of the sound-emitting unit; Alternatively, the breathable isolation mesh is arranged in the rear sound cavity, and the breathable isolation mesh cooperates with the shell to separate the rear sound 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 arranged in the second cavity.

14. An electronic device, characterized in that: Comprising the sound-generating device according to any one of claims 1 to 13.

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