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 with an internal space, 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 internal space, the rear sound cavity is filled with molecular sieve powder particles, the average particle size D50 of the molecular sieve powder particles is 20-50 microns, and the mass ratio of silicon to aluminum is 1t; 200); the breathable separator is used for separating the molecular sieve powder particles from the sounding monomer, the breathable separator is a nuclear track membrane, the aperture of the nuclear track membrane is 6-14 [mu] m, and the air permeability of the breathable separator is 1000-6000 L / m < 2 >. S at 20 mm H2O. Under the condition that the nuclear track membrane meets the acoustic use requirement, the aperture of the nuclear track membrane is far smaller than the particle size of the molecular sieve powder particles, and the molecular sieve powder particles can be effectively isolated and protected and can be prevented from leaking out to pollute the sounding monomer.

Description

Technical Field

[0001] The present invention belongs to the field of electroacoustic technology, and particularly relates to a sound-generating device and an electronic device. Background Art

[0002] In recent years, with the trend toward increasingly thinner and lighter electronic products, the space left for speakers has become increasingly smaller. The flat design of micro-speaker modules has reduced the volume of the acoustic back cavity. Folding machines, in particular, place very stringent height requirements on micro-speaker modules, resulting in extremely tight height structures. Spacings between some structural areas are less than 100μm, while traditional sound-absorbing particles have a particle size of more than 100μm, making them ineffective for filling and utilization, resulting in some wasted space. Currently, technicians use molecular sieve powder as a sound-absorbing material. Because its size is less than 100μm, it can fully fill and utilize the back acoustic cavity, effectively reducing the speaker's resonant frequency F0 and improving low-frequency sensitivity.

[0003] Woven mesh is often used as an isolation and sound-absorbing material in the rear acoustic cavity of existing speakers. In order to meet the use requirements, the pore size of the woven mesh is about 30μm. However, in actual applications, it is found that the woven mesh cannot effectively isolate and protect molecular sieve powder particles. The molecular sieve powder particles can easily enter the sound unit through the air holes of the woven mesh, thereby affecting the normal operation of the sound unit.

[0004] Therefore, existing speakers still need to be improved. Summary of the Invention

[0005] The purpose of the present invention is to provide a sound-generating device and an electronic device. The breathable isolation component used to isolate the molecular sieve powder particles from the sound-generating monomer in the sound-generating device of the present invention is composed of a nuclear pore membrane. While meeting the acoustic use requirements, the pore size of the nuclear pore membrane is much smaller than the particle size of the molecular sieve powder particles, which can effectively isolate and protect the molecular sieve powder particles to prevent leakage and contamination of the sound-generating monomer.

[0006] The first aspect of the present invention provides a sound-generating device, which includes a shell having an internal space and a sound-generating unit and a breathable isolation member arranged inside the shell. The sound-generating 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 average particle size D50 of the molecular sieve powder particles is 20μm~50μm, and the silicon-aluminum mass ratio of the molecular sieve powder particles is <200; the breathable isolation member is used to isolate the molecular sieve powder particles from the sound-generating unit, the breathable isolation member is a nuclear pore membrane, the nuclear pore membrane has a plurality of breathable micropores, the pore size of the breathable micropores is 6μm~14μm, and the air permeability of the breathable isolation member is 1000L / m 2 .S@20mmH2O~6000L / m 2 .S@20mmH2O.

[0007] In some embodiments of the present invention, the pore density of the air-permeable micropores on the nuclear pore membrane is 0.9×10 5 ~3×10 5 .

[0008] In some embodiments of the present invention, the porosity of the nuclear pore membrane is 5% to 20%.

[0009] In some embodiments of the present invention, the breathable spacer has a thickness of 6 μm to 14 μm.

[0010] In some embodiments of the present invention, the tensile strength of the breathable spacer is 5 MPa to 50 MPa.

[0011] In some embodiments of the present invention, the ratio of the thickness of the breathable spacer to the average pore size of the breathable micropores is 0.4 to 2.5.

[0012] In some embodiments of the present invention, the Vicat softening temperature of the breathable spacer is between 110°C and 200°C.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] A second aspect of the present invention further provides an electronic device, which includes the sound-generating device described in the first aspect.

[0018] On the one hand, the present invention adopts molecular sieve powder particles as sound-absorbing materials, thereby reducing the preparation process of sound-absorbing particles, making it simple to use, lower cost, and avoiding the use of adhesives, and having better acoustic performance. Moreover, under the premise of the same filling volume, since molecular sieve powder particles do not require glue to bond, while sound-absorbing particles require adhesives to bond multiple molecular sieve powder particles into shape, when only molecular sieve powder particles are filled, a larger volume of molecular sieve powder particles 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; on the other hand, the breathable isolation part used to isolate the molecular sieve powder particles from the sound-generating monomer in the sound-generating device is composed of a nuclear pore membrane, which includes a membrane body and multiple breathable micropores opened on the membrane body. The nuclear pore membrane has a smaller pore size than the woven mesh. When the required air permeability is achieved, the molecular sieve powder particles can be more effectively isolated to prevent leakage and contamination of the sound-generating monomer.

[0019] 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

[0020] 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.

[0021] Figure 1 Schematic diagram of the structure of a sound-generating device in one embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the structure of a sound-generating device in another embodiment of the present invention.

[0023] Figure 3 This is a SEM image of the nuclear pore membrane of the present invention.

[0024] Figure 4 Schematic diagram of THD curves of the sound-generating devices in the embodiment and comparative example.

[0025] Description of reference numerals:

[0026] 100- sound-generating device;

[0027] 10-shell, 20-sound-generating unit, 30-breathable spacer; 40-molecular sieve powder. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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).

[0034] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] The first aspect of the present application provides a sound generating device, which comprises Figure 1 and Figure 2 It is introduced that the sound generating device 100 comprises a shell 10 having an internal space, and a sound generating unit 20 and a breathable isolation piece 30 arranged inside the shell 10, the sound generating unit 20 cooperates with the shell 10 to define a front sound cavity and a rear sound cavity in the internal space thereof, the rear sound cavity is filled with molecular sieve powder particles 40, the average particle size D50 of the molecular sieve powder particles 40 is 20 μm-50 μm, and the silicon-aluminum mass ratio of the molecular sieve powder particles 40 is <200; the breathable isolation piece 30 is used to isolate the molecular sieve powder particles 40 from the sound generating unit 20, the breathable isolation piece 30 is a nuclear pore membrane, the nuclear pore membrane has a plurality of breathable micropores, the pore size of the breathable micropores is 6 μm-14 μm, and the breathable amount of the breathable isolation piece 30 is 1000 L / m 2 .S@20 mmH2O-6000 L / m 2 .S@20 mmH2O.

[0036] In the embodiments of the present application, on the one hand, the molecular sieve powder particles 40 are used as the sound absorbing material, the average particle size D50 of the molecular sieve powder particles 40 is in the range of 20 μm-50 μm, the silicon-aluminum mass ratio of the molecular sieve powder particles 40 is <200, the use of the molecular sieve powder particles 40 can avoid the addition of the adhesive, under the condition of the same filling volume, more volume of the molecular sieve powder particles 40 can be filled in the rear sound cavity, the volume of the effective sound absorbing material is increased, and the sound absorbing effect is improved; on the other hand, the breathable isolation piece 30 used to isolate the molecular sieve powder particles 40 from the sound generating unit 20 in the sound generating device 100 is composed of a nuclear pore membrane, the nuclear pore membrane is formed by irradiating a thin film with high-energy particles to break the polymer chain to form an irradiation damage channel, and the irradiation damage channel is oxidized and etched by a chemical reagent to finally form a pore channel, and the pore size and the pore density can be accurately controlled by adjusting the irradiation intensity, the etching conditions and the material parameters. Thus, under the condition of meeting the acoustic use requirements, the pore size of the nuclear pore membrane is much smaller than the particle size of the molecular sieve powder particles 40, and the molecular sieve powder particles 40 can be effectively isolated and protected to prevent leakage and pollution of the sound generating unit 20.

[0037] In an embodiment of the present invention, the pore size of the breathable micropores on the nuclear pore membrane is 6μm to 14μm. It should be noted that if the pore size of the breathable micropores is too small, the air permeability of the nuclear pore membrane is low, which greatly reduces the sound absorption effect of the molecular sieve powder particles 40; and if the pore size of the breathable micropores is too large, the encapsulated molecular sieve powder particles 40 are prone to leakage and cannot achieve effective sound absorption. In an embodiment of the present invention, when the pore size of the breathable micropores is 6μm to 14μm, the nuclear pore membrane can not only effectively encapsulate the molecular sieve powder particles 40, but also ensure its breathability. The pore size of the breathable micropores 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 6μm to 10μm, or it can be 10μm to 14μm, and so on. Illustratively, the pore size of the breathable micropores in the embodiment of the present invention may be one of 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, or any value within the above range.

[0038] In the embodiment of the present invention, the air permeability of the air permeable spacer 30 is 1000 L / m 2 .S@20mmH2O~6000L / m 2 .S@20mmH2O. It should be noted that if the air permeability of the air permeable spacer 30 is too low, the acoustic performance is poor, and the sound absorption effect of the molecular sieve powder 40 is greatly reduced; and if the air permeability of the air permeable spacer 30 is too high, the porosity of the nuclear pore membrane is too high, and the molecular sieve powder 40 will leak out and contaminate the sound-emitting monomer 20. In the embodiment of the present invention, when the air permeability of the air permeable spacer 30 is 1000L / m 2 .S@20mmH2O~6000L / m 2 When the S@20mmH2O is used, the molecular sieve powder 40 can be effectively encapsulated and its ventilation effect can be ensured. The ventilation rate of the breathable spacer 30 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 1000L / m 2 .S@20mmH2O~4000L / m 2 .S@20mmH2O, or 4000L / m 2 .S@20mmH2O~6000L / 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 1000L / 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 or any value that meets the above range.

[0039] In an embodiment of the present invention, 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, 30μm, 40μm, 50μm, or any value that meets the above range value.

[0040] 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.

[0041] In some embodiments of the present invention, the pore density of the air-permeable micropores on the nuclear pore membrane is 0.9×10 5 ~3×10 5 The 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, thereby affecting the sound absorption effect of the molecular sieve powder 40 and unsatisfactory acoustic performance. Too high a pore density will increase the heavy porosity of the nuclear pore membrane, destroying the singleness of the pore size. The molecular sieve powder 40 is at risk of leakage, contaminating the sound-emitting monomer 20 and 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 0.9×10 5 ~3×10 5When 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.

[0042] In some embodiments of the present invention, the porosity of the nuclear pore membrane is 5% to 20%. It should be noted that if the porosity of the nuclear pore membrane is too low, the air permeability of the nuclear pore membrane will not be achieved, affecting the sound absorption effect of the molecular sieve powder 40 and the acoustic performance is not satisfactory; and if the porosity of the nuclear pore membrane is too high, it will lead to an increase in the heavy porosity of the nuclear pore membrane, destroying the singleness of the pore size, and the molecular sieve powder 40 is at risk of leakage, contaminating the sound-emitting monomer 20, and affecting the acoustic performance. In the embodiment of the present invention, when the porosity of the nuclear pore membrane is 5% to 20%, it can not only effectively encapsulate the molecular sieve powder 40, but also ensure its air permeability. The porosity of the nuclear pore membrane 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 5% to 100%, or it can be 10% to 20%, and so on. Illustratively, the porosity of the nuclear pore membrane in the embodiment of the present invention can also be one of 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, or any value that meets the above range.

[0043] In some embodiments of the present invention, the thickness of the breathable separator 30 is 6μm to 14μm. It can be understood that if the breathable separator 30, that is, the thickness of the nuclear pore membrane is thin, it will lead to poor stiffness and low strength, easy to break during use, and increase the difficulty of the assembly process; while the thicker nuclear pore membrane has a longer pore depth, the air permeability of the nuclear pore membrane is poor, affecting the sound absorption effect of the molecular sieve powder 40, and the acoustic performance is not satisfactory. In the embodiment of the present invention, when the thickness of the breathable separator 30 is 6μm to 14μm, it can not only ensure the use strength of the nuclear pore membrane and not easily break, but also ensure its air permeability. The thickness of the nuclear pore membrane 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 6μm to 10μm, or it can be 10μm to 14μm, and so on. For example, the thickness of the nuclear pore membrane in the embodiment of the present invention can also be one of 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, or any value within the above range.

[0044] In some embodiments of the present invention, the ratio of the thickness of the breathable spacer 30 to the aperture of the breathable micropores is 0.4 to 2.5. It is understandable that if the ratio of the thickness of the breathable spacer 30 to the aperture of the breathable micropores is too small, it means that the aperture of the breathable micropores is too large, and the strength of the breathable spacer 30 cannot meet the use requirements; and if the ratio of the thickness of the breathable spacer 30 to the aperture of the breathable micropores is too large, the aperture of the breathable micropores is too small, and the air permeability of the breathable spacer 30 is too small, affecting the sound absorption effect. In the embodiment of the present invention, when the ratio of the thickness of the breathable spacer 30 to the aperture of the breathable micropores is 0.4 to 2.5, both the strength and the air permeability of the breathable spacer 30 can be taken into account. The ratio of the thickness of the breathable spacer 30 to the aperture of the breathable micropores provided by the present invention can be a value in the interval consisting of any two values ​​within the above range, for example, it can be 0.4 to 1.5, or it can be 1.5 to 2.5, and so on. Illustratively, the ratio of the thickness of the breathable isolation member 30 to the pore size of the breathable micropores in the embodiment of the present invention can also be one of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5 or any value that meets the above range value.

[0045] In some embodiments of the present invention, the tensile strength of the breathable spacer 30 is 5 MPa to 50 MPa. This means that the breathable spacer 30 has high mechanical strength and can withstand large tensile forces during use without breaking. The tensile strength of the breathable spacer 30 provided by the present invention can be one of 5 MPa, 10 MPa, 15 MPa, 20 MPa, 25 MPa, 30 MPa, 35 MPa, 40 MPa, 45 MPa, or 50 MPa, or any value within the aforementioned range.

[0046] In some embodiments of the present invention, the Vicat softening temperature of the breathable spacer 30 is between 110°C and 200°C. It is understandable that the sound-generating device 100 generates a large amount of heat during operation. Since the breathable spacer 30 of the present invention has a high softening temperature and good thermal stability, it can withstand high temperatures without affecting the change in pore size, and thus does not affect the air permeability. It does not break or deform after hot pressing, so that it can maintain good packaging and air permeability during operation. The Vicat softening temperature of the breathable spacer 30 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 110°C to 150°C, or it can be 150°C to 200°C, and so on. For example, the Vicat softening temperature of the breathable spacer 30 in the embodiment of the present invention can also be one of 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, or any value that meets the above range.

[0047] In some embodiments of the present invention, the material of the nuclear pore membrane can be, but is not limited to, one of polymer materials such as polycarbonate (PC), polyester (PET), polypropylene (PP), polyimide (PI), polyvinylidene fluoride (PVDF), and polytetrafluoroethylene (PTFE).

[0048] See also Figure 1 As shown, the air-permeable spacer 30 is disposed in the rear acoustic cavity. The air-permeable spacer 30 cooperates with the housing 10 to isolate a sound-absorbing cavity in the rear acoustic cavity. The molecular sieve powder particles 40 are filled in the sound-absorbing cavity.

[0049] In some embodiments of the present invention, the air-permeable spacer 30 is connected to the housing 10 by any of bonding, hot-melt sealing, and integrated injection molding, thereby isolating the molecular sieve powder 40. The bonding may be, but is not limited to, adhesive materials such as glue, adhesive film, and double-sided tape.

[0050] See also Figure 2 As shown, the air-permeable isolation member 30 is coated on the periphery of the sound-emitting monomer 20 to isolate the sound-emitting monomer 20 from the molecular sieve powder particles 40 .

[0051] In some embodiments of the present invention, the breathable spacer 30 can be coated on the periphery of the sound-emitting unit 20, for example, by gluing the breathable spacer 30 to the outside of the sound-emitting unit 20, thereby isolating it from the molecular sieve powder 40. Of course, other arrangements can also be adopted according to actual conditions, such as setting the breathable spacer 30 in the rear sound cavity and arranging it around the sound-emitting unit 20. In this case, the breathable spacer 30 can be connected to the shell 10 to accommodate the sound-emitting unit 20 in the space enclosed by the breathable spacer 30 and the shell 10. The connection method between the breathable spacer 30 and the shell 10 can be, but is not limited to, one of bonding, hot melt sealing, and injection molding.

[0052] In the embodiment of the present invention, the sound-generating device 100 may be, but is not limited to, a speaker.

[0053] A second aspect of the present invention provides an electronic device, the key of which is that it includes the sound-generating device 100 described in the first aspect.

[0054] In some embodiments of the present invention, the electronic device may be, but is not limited to, a mobile phone, a tablet computer, a smart watch, a game console, a learning machine, etc., and the electronic device has the characteristic of good acoustic effects.

[0055] Unless otherwise defined, the technical terms used in the following examples have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The experimental reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the raw materials, instruments and equipment used in the following examples, etc., can be purchased on the market or can be obtained by existing methods; the dosage of the experimental reagents, unless otherwise specified, are the dosage of reagents in conventional experimental operations; the experimental methods, unless otherwise specified, are all conventional methods. It should be further explained that the following description is only exemplary and not a specific limitation of the present invention. Moreover, the selection of the following comparative examples is for comparison with the technical solution of the present application to reflect the advanced nature of the technical solution of the present application, and does not mean that the comparative examples are necessarily the prior art in this technical field.

[0056] The structural dimensions of the sound-generating device in the embodiment and the comparative example are consistent.

[0057] Example 1

[0058] 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.

[0059] The molecular sieve powder 40 is ZSM-5 molecular sieve, has an average particle size D50 of 30 μm, and a silicon-aluminum ratio of 110. Specifically, a 0.21 mL funnel measuring cup is used to take 0.21 mL of the molecular sieve powder 40 and fill it into a sound absorption cavity with a volume of 0.3 mL.

[0060] The air permeable separator 30 is made of a nuclear pore membrane, which is used as a packaging surface to seal the molecular sieve powder 40 in the sound absorption cavity. The material of the nuclear pore membrane is PET, the pore size of the air permeable micropores on the nuclear pore membrane is 13μm, and the pore density of the nuclear pore membrane is 1.5×10 5 The opening rate of the nuclear pore membrane is 15%, and the air permeability of the nuclear pore membrane is 2000L / m 2 .S@20mmH2O, the thickness of the nuclear pore membrane is 11μm, the ratio of the thickness of the nuclear pore membrane to the pore size of the breathable micropores is 0.8, the tensile strength of the nuclear pore membrane is 18MPa, and the Vicat softening temperature of the nuclear pore membrane is 160℃.

[0061] Comparative Example 1

[0062] A sound-generating device. The structural arrangement of the sound-generating device in comparative example 1 is the same as that in embodiment 1, except that the breathable isolation member 30 in comparative example 1 is made of woven mesh, which is used as a packaging surface to seal the sound-absorbing particles in the sound-absorbing cavity.

[0063] The material of the woven mesh is PET, the pore size of the woven mesh is 28μm, and the air permeability of the woven mesh is 2000L / m 2 .S@20mmH2O.

[0064] The sound-absorbing particles are particles made of polyacrylate and ZSM-5 molecular sieve (with a particle size of 1 μm), and the particle size of the sound-absorbing particles is in the range of 300 μm to 400 μm.

[0065] Comparative Example 2

[0066] A sound-generating device. The structural arrangement of the sound-generating device in comparative example 2 is the same as that in embodiment 1, except that the breathable isolation member 30 in comparative example 2 is made of woven mesh, which is used as the packaging surface to seal the molecular sieve powder particles 40 in the sound-absorbing cavity.

[0067] The molecular sieve powder particles 40 are ZSM-5 molecular sieves, the average particle size D50 of the molecular sieve powder particles 40 is 30 μm, and the silicon-aluminum ratio of the molecular sieve powder particles 40 is 110.

[0068] The material of the woven mesh is PET, the pore size of the woven mesh is 28μm, and the air permeability of the woven mesh is 2000L / m 2 .S@20mmH2O.

[0069] Performance Testing

[0070] 1. Acoustic performance evaluation

[0071] The Sound Check software was used to perform an IMP (impedance test) test on each sound-generating device in the embodiment and the comparative example, and the resonant frequency F0 of the sound-generating device was measured.

[0072] Table 1 Summary of acoustic performance of the sound-generating devices in the embodiments and comparative examples

[0073]

[0074] It can be seen from the data in Table 1 that the cavity resonance frequency F0 of the sound-generating device in the embodiment and the comparative example before filling with the sound-absorbing material is consistent, indicating that the nuclear pore membrane can meet the acoustic usage requirements.

[0075] Under the same filling volume, the sound-generating device in Example 1 is filled with molecular sieve powder particles 40, and the sound-generating device in Comparative Example 1 is filled with traditional sound-absorbing particles. The comparison shows that the resonant frequency F0 of the sound-generating device in Example 1 is lower than that of the sound-generating device in Comparative Example 1, indicating that the acoustic performance improvement effect of the molecular sieve powder particles 40 in Example 1 is stronger than that of the sound-absorbing particles in Comparative Example 1. Moreover, the use of molecular sieve powder particles 40 in Example 1 can avoid the addition of adhesives, increase the effective sound-absorbing volume of the sound-absorbing material, give full play to its role, better reduce the resonant frequency of the sound-generating device, and have better bass sound quality.

[0076] 2. Drum drop test

[0077] 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 rear acoustic cavity was observed.

[0078] Table 2 Powder contamination of the rear acoustic cavity of the sound-generating device in the embodiment and the comparative example

[0079] Group Disassemble the product and check the powder contamination of the acoustic cavity Example 1 none Comparative Example 1 The particles are slightly broken and contaminated with powder Comparative Example 2 Molecular sieve powder leakage and serious pollution

[0080] It can be seen from the results in Table 2 that after the drop test, no powder leakage occurs in the sound-emitting device of Example 1, while the sound-absorbing particles in the sound-emitting device of Comparative Example 1 are slightly broken, and powder appears, which adheres to the surface of the rear sound cavity shell 10 and the sound-emitting monomer 20; in Comparative Example 2, a large amount of molecular sieve powder particles 40 leak out of the woven mesh and enter the sound-emitting monomer 20, which shows that the nuclear pore membrane in the present invention can not only prevent the molecular sieve powder particles 40 from entering the sound-emitting monomer 20, but also ensure good air permeability, so that the sound-absorbing material can better play its role and withstand more stringent reliability conditions.

[0081] 3. Low temperature BFPP experiment

[0082] Experimental conditions: -20℃ environment, voltage 2.2V, BFPP signal fed, continuous power on for 24h.

[0083] After the experiment was completed, the resonant frequency F0 of each group of sound-generating devices was measured, and the powder contamination in the sound cavity was observed after the product was disassembled.

[0084] Table 3 Summary of low-temperature BFPP test results of the sound-generating device in the embodiment and comparative example

[0085]

[0086] From the results in Table 3, it can be seen that after the low-temperature BFPP test, the change in the resonant frequency F0 of the sound-generating device in Example 1 is small, within 10Hz; while after the low-temperature BFPP test, the change in the resonant frequency F0 of the sound-generating device in Comparative Example 1 is relatively large, at 32Hz; and after the low-temperature BFPP test, the change in the resonant frequency F0 of the sound-generating device in Comparative Example 2 is relatively large, at 75Hz. Moreover, after disassembling the product, it was found that the rear sound cavity of the sound-generating device in Example 1 was clean, without any powder. However, in the sound-generating devices of Comparative Examples 1 and 2, particles were broken, and powder leaked, contaminating the rear sound cavity and the sound-generating unit 20. This shows that the nuclear pore membrane of the present invention can effectively avoid powder contamination and is more resistant to stringent reliability conditions.

[0087] Figure 3 The total harmonic distortion (THD) curves of the sound-generating devices in Example 1 and Comparative Examples 1 to 2 are shown. It can be seen from the product THD test curves that the distortion of the sound-generating devices in Comparative Examples 1 to 2 is relatively high, mainly due to particle breakage, particle powder falling and molecular sieve powder leakage from the woven mesh into the sound-generating unit 20, resulting in increased distortion.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sound-generating device, characterized in that: It includes 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 internal space thereof, the rear sound cavity is filled with molecular sieve powder particles, the average particle size D50 of the molecular sieve powder particles is 20 μm to 50 μm, and the silicon-aluminum mass ratio of the molecular sieve powder particles is less than 200; The breathable separator is used to isolate the molecular sieve powder and the sound-generating monomer. The breathable separator is a nuclear pore membrane. The nuclear pore membrane has a plurality of breathable micropores. The pore size of the breathable micropores is 6 μm to 14 μm. The air permeability of the breathable separator is 1000 L / m 2 .S@20mmH2O~6000L / m 2 .S@20mmH2O.

2. The sound-generating device according to claim 1, wherein: The pore density of the air permeable micropores on the nuclear pore membrane is 0.9×10 5 ~3×10 5 and / or, The opening rate of the nuclear pore membrane is 5% to 20%.

3. The sound-generating device according to claim 1, wherein: The thickness of the breathable spacer is 6 μm to 14 μm; And / or, the tensile strength of the breathable spacer is 5 MPa to 50 MPa.

4. The sound-generating device according to claim 1, wherein: The ratio of the thickness of the air-permeable spacer to the pore diameter of the air-permeable micropores is 0.4 to 2.

5.

5. The sound-generating device according to claim 1, wherein: The Vicat softening temperature of the breathable insulating member is between 110° C. and 200° C.

6. 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.

7. 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.

8. The sound-generating device according to claim 7, wherein: The air-permeable spacer is connected to the shell by any one of bonding, hot-melt sealing, and integral injection molding.

9. 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.

10. An electronic device, characterized in that: The invention comprises the sound-generating device according to any one of claims 1 to 9.

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