Sound production device and electronic equipment

Abstract

The invention belongs to the technical field of electroacoustics, and particularly relates to a sound production device and electronic equipment, the sound production device comprises a shell and a sound production monomer and a breathable separator which are arranged in the shell, the sound production monomer is matched with the shell to define a front sound cavity and a rear sound cavity in the shell, the rear sound cavity is filled with molecular sieve powder particles, and the breathable separator is arranged in the shell. The breathable separator is used for separating the molecular sieve powder particles from the sound production monomer, the breathable separator is a nuclear track membrane, the nuclear track membrane is provided with a plurality of breathable micropores, each breathable micropore is provided with an airflow pore channel penetrating through a membrane body, and an inclination angle alpha and 0 degree lt is formed between the extension direction of at least part of the airflow pore channels and the thickness direction of the membrane body in the flowing direction of airflow; [alpha] [lt]; and 90 degrees. According to the sound production device, under the condition that the required ventilation volume is achieved, molecular sieve powder particles can be more effectively isolated and protected, and the powder particles are prevented from leaking to pollute the sound production monomers.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electroacoustic, and particularly relates to a sound generating device and electronic equipment. BACKGROUND

[0002] In recent years, under the trend of increasingly thin and light electronic products, the space left for loudspeakers is becoming smaller, and the design of the micro loudspeaker module is flat, which causes the volume of the acoustic back cavity to be reduced. Especially for folding machines, the height requirement for micro loudspeaker modules is very strict, resulting in very limited structure in the height direction, and the distance between some structure regions is less than 100 mu m. However, the particle size of traditional sound absorbing particles is more than 100 mu m, which cannot be effectively filled and used, resulting in waste of space. Currently, technicians select molecular sieve powder as a sound absorbing material because its size is less than 100 mu m, which can fully fill and utilize the space of the back cavity, thereby effectively reducing the resonant frequency F0 of the loudspeaker and improving the low-frequency sensitivity.

[0003] In existing loudspeakers, a gas permeable mesh is often used to isolate sound absorbing materials. The pore shape of the gas permeable mesh is cylindrical, and the cylindrical pores are perpendicular to the thickness direction of the membrane. During operation, molecular sieve powder can easily enter the pores along with the airflow, which can cause some pore blockage or leakage from the pores, pollute the sound generating unit, and affect the acoustic performance.

[0004] Therefore, the existing loudspeaker still needs to be improved. SUMMARY

[0005] The purpose of the present application is to provide a sound generating device and electronic equipment. The gas permeable isolation member for isolating molecular sieve powder and the sound generating unit in the sound generating device of the present application is composed of a nuclear pore membrane. The nuclear pore membrane has a plurality of gas permeable micropores. Each gas permeable micropore has an airflow channel that penetrates the thickness direction of the membrane body. In addition, along the flow direction of the airflow, at least part of the airflow channels has an inclination angle a between the extension direction of the airflow channel and the thickness direction of the membrane body, 0° < a < 90°. Under the condition of reaching the required air permeability, the molecular sieve powder can be more effectively isolated and protected to prevent the powder from leaking and polluting the sound generating unit.

[0006] The first aspect of the present invention provides a sound-emitting device, which includes a shell having an internal space and a sound-emitting unit and a breathable isolation member arranged inside the shell. The sound-emitting unit cooperates with the shell to define a front sound cavity and a rear sound cavity in its internal space. The rear sound cavity is filled with molecular sieve powder particles. The breathable isolation member is used to isolate the molecular sieve powder particles from the sound-emitting unit. The breathable isolation member is a nuclear pore membrane. The nuclear pore membrane includes a membrane body and a plurality of breathable micropores opened on the membrane body. Each of the breathable micropores has an air flow channel passing through the membrane body, and along the flow direction of the air flow, at least part of the extension direction of the air flow channel has an inclination angle α with the thickness direction of the membrane body, 0°<α<90°.

[0007] In some embodiments of the present invention, each of the air-permeable micropores independently has a first end close to the molecular sieve powder particles and a second end away from the molecular sieve powder particles, the inner diameter of the first end is smaller than the average particle size D50 of the molecular sieve powder particles, and the inner diameter of the second end is greater than or equal to the inner diameter of the first end.

[0008] In some embodiments of the present invention, the average particle size D50 of the molecular sieve powder is 20 μm to 50 μm, and the silicon to aluminum mass ratio of the molecular sieve powder is less than 200.

[0009] In some embodiments of the present invention, the pore size of each of the first ends of the ventilating micropores is independently 2 μm to 8 μm, and the pore size of each of the second ends of the ventilating micropores is independently 6 μm to 18 μm.

[0010] In some embodiments of the present invention, the air flow channel shape of the ventilating micropores includes at least one of a funnel shape, a wine glass shape, a pencil head shape, a spindle shape, and a cylinder shape.

[0011] In some embodiments of the present invention, the air flow channels of the plurality of air-permeable micropores are arranged parallel to or cross each other.

[0012] In some embodiments of the present invention, the air permeability of the nuclear pore membrane is 1500 L / m 2 .S@20mmH2O~7000L / m 2 .S@20mmH2O.

[0013] In some embodiments of the present invention, the pore density of the air-permeable micropores on the nuclear pore membrane is 0.95×10 5 ~3×10 5 .

[0014] In some embodiments of the present invention, the porosity of the nuclear pore membrane is 5% to 25%.

[0015] In some embodiments of the present invention, the thickness of the nuclear pore membrane is 10 μm to 20 μm.

[0016] In some embodiments of the present invention, the material of the nuclear pore membrane includes one of polycarbonate, polyester, polypropylene, polyimide, polyvinylidene fluoride, and polytetrafluoroethylene.

[0017] In some embodiments of the present invention, the air-permeable isolation member is disposed in the rear acoustic cavity and cooperates with the shell to isolate a sound-absorbing cavity in the rear acoustic cavity, and the molecular sieve powder particles are filled in the sound-absorbing cavity.

[0018] In some embodiments of the present invention, the breathable spacer is connected to the shell by any one of bonding, hot melt sealing, and integrated injection molding.

[0019] In some embodiments of the present invention, the air-permeable isolation member is coated on the periphery of the sound-emitting monomer to isolate the sound-emitting monomer from the molecular sieve powder particles.

[0020] A second aspect of the present invention further provides an electronic device, which includes the sound-generating device described in the first aspect.

[0021] The breathable isolation component for isolating molecular sieve powder particles from the sound-generating monomer in the sound-generating device provided by the present invention is composed of a nuclear pore membrane. The nuclear pore membrane includes a membrane body and a plurality of breathable micropores opened on the membrane body. Each breathable micropore has an air flow channel that passes through the thickness direction of the membrane body, and along the flow direction of the air flow, there is an inclination angle α between the extension direction of at least part of the air flow channel and the thickness direction of the membrane body, 0°<α<90°. While meeting the air permeability requirements, it can more effectively isolate and protect the molecular sieve powder particles and prevent the molecular sieve powder particles from leaking out and contaminating the sound-generating monomer.

[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 Schematic diagram of the structure of a sound-generating device in one embodiment of the present invention.

[0025] Figure 2 Schematic diagram of the structure of a sound-generating device in another embodiment of the present invention.

[0026] Figure 3 This is a SEM image of the nuclear pore membrane of the present invention.

[0027] Figure 4 Schematic diagram of the structure of the wine glass-shaped air flow channel in an embodiment of the present invention.

[0028] Figure 5 Schematic diagram of the structure of the funnel-shaped air flow channel in an embodiment of the present invention.

[0029] Figure 6 Schematic diagram of the structure of the pencil-head-shaped air flow channel in an embodiment of the present invention.

[0030] Figure 7 Schematic diagram of the structure of the shuttle-shaped air flow channel in an embodiment of the present invention.

[0031] Figure 8 Schematic diagram of the structure of cylindrical air flow channels arranged in parallel and obliquely in an embodiment of the present invention.

[0032] Figure 9 Schematic diagram of the structure of cylindrical air flow channels arranged obliquely and crosswise in one embodiment of the present invention.

[0033] Figure 10 Schematic diagram of the structure of cylindrical air flow channels arranged obliquely and crosswise in another embodiment of the present invention.

[0034] Figure 11 Schematic diagram of HOHD curves of the sound-generating devices in the embodiment and comparative example.

[0035] Description of reference numerals:

[0036] 100- sound-generating device;

[0037] 10-shell, 20-sound-generating unit, 30-breathable spacer; 40-molecular sieve powder. DETAILED DESCRIPTION

[0038] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0039] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0040] In the description of the embodiments of the present invention, technical terms such as "first" and "second" are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0041] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of the present invention, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exists simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0043] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0045] The first aspect of the present invention provides a sound generating device, Figures 1 to 10 Introduction: The sound-emitting device 100 includes a shell 10 with an internal space, and a sound-emitting unit 20 and a breathable isolation member 30 arranged inside the shell 10. The sound-emitting unit 20 cooperates with the shell 10 to define a front sound cavity and a rear sound cavity in its internal space. The rear sound cavity is filled with molecular sieve powder particles 40. The breathable isolation member 30 is used to isolate the molecular sieve powder particles 40 from the sound-emitting unit 20. The breathable isolation member 30 is a nuclear pore membrane. The nuclear pore membrane includes a membrane body and a plurality of breathable micropores opened on the membrane body. Each breathable micropore has an air flow channel passing through the membrane body, and along the flow direction of the air flow, at least part of the extension direction of the air flow channel has an inclination angle α with respect to the thickness direction of the membrane body, 0°<α<90°.

[0046] In an embodiment of the present invention, the breathable isolation member 30 for isolating the molecular sieve powder 40 from the sound-emitting monomer 20 in the sound-emitting device 100 is composed of a nuclear pore membrane. The breathable micropores provided on the membrane body of the nuclear pore membrane have a special airflow channel structure. Along the flow direction of the airflow, there is an inclination angle α between the extension direction of at least part of the airflow channel and the thickness direction of the membrane body, 0°<α<90°, which effectively isolates and protects the molecular sieve powder 40 and prevents it from leaking out and contaminating the sound-emitting monomer 20. Specifically, since there is an inclination angle α between the extension direction of the airflow channel and the thickness direction of the membrane body, 0°<α<90°, compared with conventional vertically extending channels (i.e., α=0°), the airflow channels in the present invention can make it difficult for the molecular sieve powder 40 to enter the airflow channel, thereby preventing the molecular sieve powder 40 from clogging the breathable micropores and affecting the ventilation effect.

[0047] In an embodiment of the present invention, along the flow direction of the airflow, the inclination angle α between the extension direction of the airflow duct and the thickness direction of the membrane body can be a value within the interval consisting of any two values ​​within the above range, for example, it can be 0°<α<50°, or it can be 50°<α<90°, and so on. Exemplarily, in an embodiment of the present invention, the inclination angle α between the extension direction of the airflow duct and the thickness direction of the membrane body can be one of 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85° or any value that meets the above range.

[0048] In an embodiment of the present invention, molecular sieve powder particles 40 are used as sound-absorbing materials, thereby reducing the preparation process of the sound-absorbing particles, making it simple to use, lower in cost, and avoiding the use of adhesives, and having better acoustic performance. Moreover, under the premise of the same filling volume, since the molecular sieve powder particles 40 do not require glue to bond, while the sound-absorbing particles require adhesives to bond multiple molecular sieve powder particles into shape, when only the molecular sieve powder particles 40 are filled, a larger volume of molecular sieve powder particles 40 can be filled in the rear sound cavity, thereby improving the sound absorption effect and further improving the low-frequency performance of the sound-generating device 100.

[0049] In some embodiments of the present invention, each air-permeable micropore independently has a first end proximal to the molecular sieve powder 40 and a second end distal to the molecular sieve powder 40. The inner diameter of the first end is smaller than the average particle size D50 of the molecular sieve powder 40, while the inner diameter of the second end is greater than or equal to the inner diameter of the first end. Since the inner diameter of the first end is smaller than the average particle size D50 of the molecular sieve powder 40, it can better prevent leakage of the molecular sieve powder 40. The inner diameter of the second end is greater than or equal to the inner diameter of the first end, thereby preventing the molecular sieve powder 40 from entering the airflow channel and ensuring that the nuclear pore membrane has an air permeability that meets acoustic requirements.

[0050] In some embodiments of the present invention, the average particle size D50 of the molecular sieve powder particles 40 is 20 μm to 50 μm, and the silicon to aluminum mass ratio of the molecular sieve powder particles 40 is less than 200.

[0051] The average particle size D50 of the molecular sieve powder 40 tested by a laser particle size analyzer is between 20μm and 50μm. The internal structure of the molecular sieve powder 40 within this particle size range is tightly arranged, and there can be more pore structure units per unit volume, which has better acoustic performance. In addition, the particles within this particle size range are not easy to generate dust, have good fluidity and are easy to fill, and are less harmful to the human respiratory system during operation. The average particle size D50 of the molecular sieve powder 40 provided by the present invention can be a value in the interval composed of any two values ​​within the above range, for example, it can be 20μm to 40μm, or it can be 40μm to 50μm, and so on. For example, the average particle size D50 of the molecular sieve powder 40 in the embodiment of the present invention can also be one of 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, or any value that meets the above range value.

[0052] The silicon-aluminum ratio of the molecular sieve powder 40 provided by the present invention is less than 200. It can be understood that since the present invention directly fills the molecular sieve powder 40 into the rear sound cavity of the sound-generating device, compared with the conventional solution of filling sound-absorbing particles, the sound-absorbing particles require an adhesive to bond multiple sound-absorbing raw powders into shape. Under the same filling volume, since the molecular sieve powder 40 of the present invention does not contain an adhesive, the filling amount of the molecular sieve powder 40 in the present invention is larger, and the sound absorption effect is better. For example, the silicon-aluminum ratio of the molecular sieve powder 40 can be one of 190, 180, 170, 160, 150, 140, 130, 120, 110, 100, 90, 80, 70, 60, 50, 40, 30, 20, 10 or any value that meets the above range value.

[0053] The nuclear pore membrane is made by irradiating the thin film with high-energy particles, breaking the polymer chains and forming radiation-damaged channels. Chemical reagents are then used to oxidize and etch the radiation-damaged channels, ultimately forming pores. By adjusting the irradiation intensity, etching conditions, and material parameters, the pore size and pore density can be precisely controlled. In some embodiments of the present invention, the pore size at the first end of each ventilating micropore is independently 2μm to 8μm, and the pore size at the second end of each ventilating micropore is independently 6μm to 18μm. It should be noted that if the pore size of the ventilating micropore is too small, the air permeability of the nuclear pore membrane is low, significantly reducing the sound absorption effect of the molecular sieve powder 40. If the pore size of the ventilating micropore is too large, the encapsulated molecular sieve powder 40 is prone to leakage, and the sound absorption effect is ineffective. The pore size of the first end of the ventilating micropore provided by the present invention can be a range consisting of any two values ​​within the above range, for example, 2μm to 5μm, or 5μm to 8μm, and so on. Exemplarily, the pore size of the first end of the breathable micropore in the embodiment of the present invention can also be one of 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm or any numerical value that meets the above range value. The pore size of the second end of the breathable micropore provided by the present invention can be a value of an interval composed of any two values ​​within the above range, for example, it can be 6μm to 12μm, or it can be 12μm to 18μm, and so on. Exemplarily, the pore size of the second end of the breathable micropore in the embodiment of the present invention can also be one of 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm or any numerical value that meets the above range value.

[0054] In some embodiments of the present invention, the shape of the air flow channel of the ventilating micropores may be, but is not limited to, a funnel shape, a wine glass shape, a pencil head shape, a shuttle shape, or a cylinder shape.

[0055] In an embodiment of the present invention, the air flow channel of the breathable micropores can be a channel with different pore sizes at both ends, such as a funnel-shaped, wine glass-shaped, pencil head-shaped, shuttle-shaped, etc. The use of air flow channels with different pore sizes at both ends can not only ensure that the nuclear pore membrane has a larger air permeability, but also provide better packaging, protection and isolation for the molecular sieve powder particles 40. The molecular sieve powder particles 40 will not enter the air flow channel, and molecular sieve powder particles 40 with a wider particle size can also be encapsulated.

[0056] In some embodiments of the present invention, the airflow channels of the multiple air-permeable micropores are arranged parallel to or intersecting with each other. It can be understood that the airflow channels of the nuclear pore membrane may be parallel and inclined, or intersecting and inclined. Because the extension direction of the airflow channels forms a certain angle with the thickness direction of the membrane body, the nuclear pore membrane, while ensuring the required air permeability, prevents the molecular sieve particles 40 from entering the airflow channels, thereby providing better protection and isolation for the molecular sieve particles 40.

[0057] In some embodiments of the present invention, the air permeability of the nuclear pore membrane is 1500 L / m 2 .S@20mmH2O~7000L / m 2 .S@20mmH2O. It should be noted that if the air permeability of the nuclear pore membrane is too low, the sound absorption effect of the molecular sieve powder 40 will be greatly reduced, and the acoustic performance will be poor; if the air permeability of the nuclear pore membrane is too large, the heavy porosity of the nuclear pore membrane is too high, and the molecular sieve powder 40 will leak out and contaminate the sound-generating monomer 20, and will not achieve effective sound absorption. In the embodiment of the present invention, when the air permeability of the nuclear pore membrane is 1500L / m 2 .S@20mmH2O~7000L / m 2 When S@20mmH2O, it can not only effectively encapsulate the molecular sieve powder 40, but also ensure its air permeability. The air permeability of the nuclear pore membrane provided by the present invention can be a value between any two values ​​within the above range, for example, it can be 1500L / m 2 .S@20mmH2O~4000L / m 2 .S@20mmH2O, or 4000L / m 2 .S@20mmH2O~7000L / m 2 .S@20mmH2O, and so on. For example, the air permeability of the nuclear pore membrane in the embodiment of the present invention can also be 1500L / m 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 or any value that meets the above range.

[0058] In some embodiments of the present invention, the pore density of the air permeable micropores on the nuclear pore membrane is 0.95×10 5 ~3×10 5The pore density refers to the number of pores per square centimeter on the nuclear pore membrane. Too low a pore density will result in a low air permeability of the nuclear pore membrane, which will greatly reduce the sound absorption effect of the molecular sieve powder 40 and the acoustic performance will not be satisfactory. However, too high a pore density will increase the heavy porosity of the nuclear pore membrane, destroy the singleness of the pore size, and the molecular sieve powder 40 will be at risk of leakage, contaminating the sound-emitting monomer 20, and failing to achieve effective sound absorption, thus affecting the acoustic performance. In the embodiment of the present invention, when the pore density of the air-permeable micropores on the nuclear pore membrane is 0.95×10 5 ~3×10 5 When the molecular sieve powder 40 is effectively encapsulated, the air permeability can also be ensured. The pore density of the air permeable micropores on the nucleopore membrane provided by the present invention can be a value between any two values ​​within the above range, for example, it can be 0.9×10 5 ~2×10 5 , or 2×10 5 ~3×10 5 , and so on. For example, the pore density of the nuclear pore membrane in the embodiment of the present invention can also be 0.9×10 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 5 or any value that satisfies the above range.

[0059] In some embodiments of the present application, the open porosity of the nuclear pore membrane is 5% to 25%. It can be understood that if the open porosity of the nuclear pore membrane is too low, the air permeability of the nuclear pore membrane cannot be reached, which greatly reduces the sound absorption effect of the molecular sieve powder particles 40 and does not meet the acoustic performance. If the open porosity of the nuclear pore membrane is too high, it will increase the heavy porosity, destroy the single nature of the pore size, and there is a risk of leakage of the molecular sieve powder particles 40, which cannot effectively absorb sound and will also pollute the sound-producing monomer 20, affecting the acoustic performance. In the embodiments of the present application, when the open porosity of the nuclear pore membrane is 5% to 25%, the molecular sieve powder particles 40 can be effectively packaged, and the air permeability can be ensured. The open porosity of the nuclear pore membrane provided by the present application can be a value within the interval formed by any two values in the above range, such as 5% to 10%, or 10% to 25%, and so on. For example, the open porosity of the nuclear pore membrane in the embodiments of the present application can also be one of 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25% or any value meeting the above range.

[0060] In some embodiments of the present application, the thickness of the nuclear pore membrane is 10 to 20 microns. It should be noted that if the thickness of the nuclear pore membrane is too thin, it has poor stiffness and low strength, and is easy to break during use, and increases the difficulty of assembly process. The thicker nuclear pore membrane has a longer pore depth and poor air permeability, which greatly reduces the sound absorption effect of the molecular sieve powder particles 40 and does not meet the acoustic performance. In the embodiments of the present application, when the thickness of the nuclear pore membrane is 10 to 20 microns, the strength of the nuclear pore membrane can be ensured not to be easily broken, and the air permeability can be ensured. The thickness of the nuclear pore membrane provided by the present application can be a value within the interval formed by any two values in the above range, such as 10 to 15 microns, or 15 to 20 microns, and so on. For example, the thickness of the nuclear pore membrane in the embodiments of the present application can also be one of 10 microns, 11 microns, 12 microns, 13 microns, 14 microns, 15 microns, 16 microns, 17 microns, 18 microns, 19 microns, 20 microns or any value meeting the above range.

[0061] In some embodiments of the present application, the material of the nuclear pore membrane can be one of polycarbonate (PC), polyester (PET), polypropylene (PP), polyimide (PI), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), etc. high molecular material.

[0062] Referring to Figure 1 As shown in the figure, the air-permeable isolation piece 30 is arranged in the rear sound cavity, and the air-permeable isolation piece 30 cooperates with the shell 10 to isolate the sound absorption cavity in the rear sound cavity, and the molecular sieve powder particles 40 are filled in the sound absorption cavity.

[0063] In some embodiments of the present application, the air-permeable separator 30 is connected to the shell 10 by any one of bonding, hot-melt sealing, and injection molding, thereby isolating the molecular sieve particles 40. The bonding can be, but is not limited to, using bonding materials such as glue, adhesive film, and double-sided tape.

[0064] Referring to Figure 2 As shown, the air-permeable separator 30 is wrapped around the outer periphery of the sound-emitting unit 20 to isolate the sound-emitting unit 20 from the molecular sieve particles 40.

[0065] In some embodiments of the present application, the air-permeable separator 30 can be wrapped around the outer periphery of the sound-emitting unit 20, for example, by using a gluing method to wrap the air-permeable separator 30 on the outer side of the sound-emitting unit 20, thereby isolating it from the molecular sieve particles 40. Of course, other setting methods can also be used according to actual conditions, such as setting the air-permeable separator 30 in the rear sound cavity and arranging it around the sound-emitting unit 20. At this time, the air-permeable separator 30 can be connected to the shell 10 to contain the sound-emitting unit 20 in the space enclosed by the air-permeable separator 30 and the shell 10. The connection method of the air-permeable separator 30 and the shell 10 can be, but is not limited to, one of bonding, hot-melt sealing, and injection molding.

[0066] In embodiments of the present application, the sound-emitting device 100 can be, but is not limited to, a loudspeaker.

[0067] The second aspect of the present application provides an electronic device, the key of which is that it comprises the sound-emitting device 100 of the first aspect.

[0068] In some embodiments of the present application, the electronic device can be, but is not limited to, a mobile phone, a tablet computer, a smart watch, a game console, a learning machine, etc., and has the feature of good acoustic effect.

[0069] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as generally understood by those skilled in the art to which the present application belongs. The experimental reagents used in the following embodiments are conventional biochemical reagents unless otherwise specified. The raw materials, instruments, and equipment used in the following embodiments can be purchased on the market or obtained by existing methods. The amount of the experimental reagents used is the amount of reagents used in conventional experimental operations unless otherwise specified. The experimental methods used are conventional methods unless otherwise specified. It needs to be further explained that the following description is only exemplary and not a specific limitation of the present application. Moreover, the selection of the following comparative examples is to compare with the technical scheme of the present application to reflect the advancement of the technical scheme of the present application, and the scheme of the comparative examples does not necessarily represent the prior art in the technical field.

[0070] The structure and size of the sound-emitting device in the embodiments and comparative examples are consistent.

[0071] Example 1

[0072] A sound production device is shown in Figure 1 The sound production device 100 includes a housing 10 having an internal space, and a sound production unit 20 and a gas-permeable partition 30 arranged inside the housing 10. The sound production unit 20 cooperates with the housing 10 to define a front sound cavity and a rear sound cavity in the internal space thereof. The gas-permeable partition 30 is arranged in the rear sound cavity and cooperates with the housing 10 to isolate an acoustic absorption cavity in the rear sound cavity. The acoustic absorption cavity is filled with molecular sieve particles 40.

[0073] The molecular sieve particles 40 are selected from ZSM-5 molecular sieve. The average particle size D50 of the molecular sieve particles 40 is 26 μm, and the silicon-aluminum ratio of the molecular sieve particles 40 is 140. Specifically, 0.18 mL of the molecular sieve particles 40 is taken using a 0.18 mL funnel measuring cup and filled into the acoustic absorption cavity with a volume of 0.3 mL.

[0074] The gas-permeable partition 30 is selected from a nuclear pore membrane. The nuclear pore membrane is used as an encapsulation surface to encapsulate the molecular sieve particles 40 in the acoustic absorption cavity. The nuclear pore membrane includes a membrane body and a plurality of gas-permeable micropores formed in the membrane body. Each gas-permeable micropore has a funnel-shaped airflow channel penetrating through the thickness direction of the membrane body. The inclination angle α between the extension direction of part of the airflow channels and the thickness direction of the membrane body is 30°. The material of the membrane body is PET. The second end pore size of the gas-permeable micropores is 14 μm, and the first end pore size is 5 μm. The gas permeability of the nuclear pore membrane is 2500 L / m 2 @ 20 mmH2O. The thickness of the nuclear pore membrane is 14 μm.

[0075] Example 2

[0076] A sound production device is shown in Figure 1 The sound production device 100 includes a housing 10 having an internal space, and a sound production unit 20 and a gas-permeable partition 30 arranged inside the housing 10. The sound production unit 20 cooperates with the housing 10 to define a front sound cavity and a rear sound cavity in the internal space thereof. The gas-permeable partition 30 is arranged in the rear sound cavity and cooperates with the housing 10 to isolate an acoustic absorption cavity in the rear sound cavity. The acoustic absorption cavity is filled with molecular sieve particles 40.

[0077] The molecular sieve particles 40 are selected from ZSM-5 molecular sieve. The average particle size D50 of the molecular sieve particles 40 is 26 μm, and the silicon-aluminum ratio of the molecular sieve particles 40 is 140. Specifically, 0.18 mL of the molecular sieve particles 40 is taken using a 0.18 mL funnel measuring cup and filled into the acoustic absorption cavity with a volume of 0.3 mL.

[0078] The breathable spacer 30 uses a nuclear pore membrane as the packaging surface to seal the molecular sieve powder 40 in the sound absorption cavity. The nuclear pore membrane includes a membrane body and a plurality of breathable micropores opened on the membrane body. Each breathable micropore has a cylindrical air flow channel that runs through the thickness of the membrane body. The inclination angle α between the extension direction of all air flow channels and the thickness direction of the membrane body is 45°, and they are arranged parallel to each other. The material of the membrane body is PET, the pore diameter of the breathable micropores is 11μm, and the air permeability of the nuclear pore membrane is 2500L / m 2 .S@20mmH2O, the pore density of the nuclear pore membrane is 1.9×10 5 The opening rate of the nuclear pore membrane is 14%, and the thickness of the nuclear pore membrane is 12 μm.

[0079] Comparative Example 1

[0080] A sound-producing device, see Figure 1 As shown, the sound-emitting device 100 includes a shell 10 having an internal space, and a sound-emitting unit 20 and a breathable isolation member 30 arranged inside the shell 10. The sound-emitting unit 20 cooperates with the shell 10 to define a front sound cavity and a rear sound cavity in its internal space. The breathable isolation member 30 is arranged in the rear sound cavity. The breathable isolation member 30 cooperates with the shell 10 to isolate a sound-absorbing cavity in the rear sound cavity. The sound-absorbing cavity is filled with molecular sieve powder particles 40.

[0081] The molecular sieve powder 40 is ZSM-5 molecular sieve, and the average particle size D50 of the molecular sieve powder 40 is 26 μm, and the silicon-aluminum ratio is 140. Specifically, a 0.18 mL funnel measuring cup is used to take 0.18 mL of the molecular sieve powder 40 and fill it into a sound absorption cavity with a volume of 0.3 mL.

[0082] The breathable spacer 30 is made of a nucleus-pore membrane, which serves as the encapsulation surface to seal the molecular sieve powder 40 within the sound-absorbing cavity. The nucleus-pore membrane comprises a membrane body and a plurality of breathable micropores formed on the membrane body. Each breathable micropore has a cylindrical airflow channel extending through the thickness of the membrane body. The angle α between the extension direction of all airflow channels and the thickness direction of the membrane body is 0°, i.e. perpendicular to the airflow channel. The membrane body is made of PET, the pore diameter of the breathable micropores is 11 μm, and the air permeability of the nucleus-pore membrane is 2500 L / m 2 .S@20mmH2O, the pore density of the nuclear pore membrane is 2×10 5 The opening rate of the nuclear pore membrane is 15%, and the thickness of the nuclear pore membrane is 13 μm.

[0083] Performance Testing

[0084] 1. High temperature and high humidity power-on test evaluation

[0085] Evaluation method: 65℃, 95% RH environment, 3.5V voltage pink noise signal, continuous power on for 120h.

[0086] After the experimental evaluation is completed, the resonant frequency F0 of the sound-generating device is tested, and the sound-generating device is disassembled to observe the powder falling of the molecular sieve powder particles.

[0087] In the present invention, acoustic tests were performed on each sound-generating device in the embodiment and the comparative example before and after the experiment, and the products were disassembled to observe the damage and powder falling of the molecular sieve powder particles.

[0088] Table 1 Summary of high temperature and high humidity power-on test results of the sound-generating device in the embodiment and comparative example

[0089]

[0090] It can be seen from the experimental results in Table 1 that after the high temperature and high humidity power-on experiment, the change in the resonant frequency F0 of the sound-emitting device in the embodiment is within 10Hz, while the change in the resonant frequency F0 of the sound-emitting device in Comparative Example 1 reaches 30Hz, and the embodiment is significantly better than the comparative example. Moreover, after disassembling the product, it was observed that the molecular sieve powder particles in Examples 1 and 2 were not damaged, and no fine powder leaked out. However, in Comparative Example 1, fine powder blocked the air flow channels and leaked, adhering to the surface of the rear sound cavity shell 10 and the sound-emitting monomer 20. Part of the air flow channels in Comparative Example 1 were blocked, resulting in a large change in the resonant frequency F0 after the experiment. This shows that the breathable isolation member 30 in the present invention can prevent the molecular sieve powder particles 40 from entering the sound-emitting monomer 20, while also ensuring good air permeability, so that the molecular sieve powder particles 40 can better achieve a sound-absorbing effect and withstand more stringent reliability conditions.

[0091] Figure 11 A graph showing the high-order harmonic distortion (HOHD) test results for various sound-generating devices in the embodiments of the present invention and the comparative examples is shown, with the horizontal axis representing frequency (Hz) and the vertical axis representing HOHD (%). The HOHD test curves for the products show that the sound-generating device in Comparative Example 1 exhibits relatively high high-order harmonic distortion. This is primarily due to molecular sieve powder particles 40 or falling powder leaking from the nucleus pore membrane into the sound-generating unit 20, affecting the vibration of the voice coil and increasing distortion, thus affecting the listening experience of the product.

[0092] 2. Drum drop test

[0093] Each sound-generating device in the embodiment and comparative example was assembled in a 200g drop fixture, dropped from a height of 1m, rotated at a frequency of 20 times / min, and dropped 600 times. After the experiment, the product was disassembled and the powder contamination in the sound cavity was observed.

[0094] Table 2 Summary of the drum drop test results of the sound-generating device in the embodiments and comparative examples

[0095] Group Powder contamination in the back sound chamber Example 1 No Example 2 No Comparative Example 1 With powder contamination

[0096] As can be seen from the results in Table 2, no broken powder leakage occurred in the sound production device of the examples after the drop test, while the molecular sieve powder 40 leaked in the sound production device of Comparative Example 1, and adhered to the surface of the rear sound cavity shell 10 and the sound production monomer 20, which shows that the breathable separator 30 in the present application can effectively isolate and protect the molecular sieve powder 40, and avoid the occurrence of the risk of molecular sieve powder 40 leakage.

[0097] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sound-generating device, characterized in that: It comprises a shell having an internal space, a sound-emitting unit and a breathable isolation member arranged inside the shell, The sound-emitting monomer cooperates with the shell to define a front sound cavity and a rear sound cavity in the inner space thereof, and the rear sound cavity is filled with molecular sieve powder particles. The breathable isolation member is used to isolate the molecular sieve powder particles from the sound-emitting monomer. The breathable isolation member is a nuclear pore membrane. The nuclear pore membrane includes a membrane body and a plurality of breathable micropores opened on the membrane body. Each of the breathable micropores has an air flow channel passing through the membrane body, and along the flow direction of the air flow, at least part of the extension direction of the air flow channel has an inclination angle α with respect to the thickness direction of the membrane body, 0°<α<90°.

2. The sound-generating device according to claim 1, wherein: Each of the air-permeable micropores independently has a first end close to the molecular sieve powder particles and a second end away from the molecular sieve powder particles. The inner diameter of the first end is smaller than the average particle size D50 of the molecular sieve powder particles, and the inner diameter of the second end is greater than or equal to the inner diameter of the first end; And / or, the average particle size D50 of the molecular sieve powder is 20 μm to 50 μm, and the silicon to aluminum mass ratio of the molecular sieve powder is less than 200.

3. The sound-generating device according to claim 2, wherein: The pore size of the first end of each of the air-permeable micropores is independently 2 μm to 8 μm, and the pore size of the second end of each of the air-permeable micropores is independently 6 μm to 18 μm.

4. The sound-generating device according to claim 1, wherein: The air flow channel shape of the ventilating micropores includes at least one of a funnel shape, a wine glass shape, a pencil head shape, a shuttle shape, and a cylinder shape.

5. The sound-generating device according to claim 1, wherein: The air flow channels of the plurality of air-permeable micropores are arranged parallel to or cross each other.

6. The sound-generating device according to claim 1, wherein: The air permeability of the nuclear pore membrane is 1500L / m 2 .S@20mmH2O~7000L / m 2 .S@20mmH2O.

7. The sound-generating device according to claim 1, wherein: The pore density of the air permeable micropores on the nuclear pore membrane is 0.95×10 5 ~3×10 5 and / or, The opening rate of the nuclear pore membrane is 5% to 25%.

8. The sound-generating device according to claim 1, wherein: The thickness of the nuclear pore membrane is 10 μm to 20 μm.

9. The sound-generating device according to claim 1, wherein: The material of the nuclear pore membrane includes one of polycarbonate, polyester, polypropylene, polyimide, polyvinylidene fluoride and polytetrafluoroethylene.

10. The sound-generating device according to claim 1, wherein: The air-permeable isolation member is disposed in the rear acoustic cavity and cooperates with the shell to isolate a sound-absorbing cavity in the rear acoustic cavity. The molecular sieve powder particles are filled in the sound-absorbing cavity.

11. The sound generating device according to claim 10, wherein: The air-permeable spacer is connected to the shell by any one of bonding, hot-melt sealing, and integral injection molding.

12. The sound-generating device according to claim 1, wherein: The air-permeable isolation piece is coated on the periphery of the sound-generating monomer to isolate the sound-generating monomer from the molecular sieve powder particles.

13. An electronic device, characterized in that: The invention comprises the sound-generating device according to any one of claims 1 to 12.

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