Leakage-proof powder acoustic reinforcing material with breathable barrier film, loudspeaker and electronic equipment

Abstract

The utility model provides a powder leakage prevention acoustic reinforcing material with a breathable barrier film, a loudspeaker and an electronic device, the powder leakage prevention acoustic reinforcing material with the breathable barrier film comprises a basic acoustic reinforcing material and the breathable barrier film wrapping or covering the basic acoustic reinforcing material, the Gurley method air permeability of the breathable barrier film is smaller than 10 s, the thickness is smaller than 80 microns, and the maximum aperture is not larger than 50 microns. According to the utility model, on the premise of preventing powder leakage, the powder-leakage-proof acoustic reinforcing material with the breathable barrier film does not additionally occupy the space of a rear cavity of a loudspeaker, does not need to partially sacrifice the acoustic performance for improving the bonding agent dosage to improve the strength and prevent powder falling, and even can reduce the bonding agent dosage to a certain extent, so that the cost is reduced. The utilization rate of the rear cavity of the loudspeaker is improved, and the filling amount of the acoustic reinforcing material in the unit volume of the rear cavity is increased, so that the acoustic performance is improved to a certain extent.

Description

Technical Field

[0001] The utility model relates to a leak-proof powder acoustic enhancement material with a breathable barrier film, a loudspeaker and an electronic device, belonging to the field of materials, especially the technical field of acoustic materials. Background Art

[0002] With the development of technology, people's requirements for loudspeakers are getting higher and higher. Especially for mobile phone loudspeakers, not only is it required to have a small volume and produce sound, but it is more inclined to require good sound quality while having a small volume. The quality of sound is related to all aspects such as the design and manufacturing process of the loudspeaker, especially the size of the rear cavity design of the loudspeaker. Generally, when the rear cavity of the loudspeaker is reduced, the response in the low-frequency band will be significantly reduced, resulting in poor sound quality. Therefore, it is very difficult to provide good sound quality under the condition of a very small rear cavity.

[0003] To solve the above contradiction, engineers have proposed various methods. For example: 1) replacing air with a gas with better acoustic compliance as the atmosphere in the rear cavity; 2) filling traditional high-porosity and low-density porous materials into the rear cavity, such as melamine foam, open-cell polyurethane sponge, aerogel, etc. to increase acoustic compliance; 3) filling materials with micropores (here micropores refer to pores with a pore diameter less than 2 nm defined by the International Union of Pure and Applied Chemistry, rather than the micropores of a microporous plate commonly referred to in the acoustic field or relatively macroscopic acoustic micropores), such as porous materials like activated carbon, zeolite, and silica, to increase the virtual rear cavity volume and improve acoustic compliance. Among them, the effect of the third technical means is the most obvious.

[0004] For example, EP2424270A discloses an acoustic enhancement material, which is to add 1-20% of a polymer binder or glue to the original powder or particles of 0.5-2μm zeolite molecular sieve, and bond them into zeolite particles containing 1-30μm air permeability. The addition of a polymer binder or glue will significantly affect the acoustic performance and stability of the zeolite molecular sieve particles. In order to better exert the acoustic enhancement performance of zeolite particles, it is necessary to reduce the influence of the polymer binder or glue. In addition to improving the quality of zeolite particles, it is also necessary to use as little binder as possible to bond the zeolite molecular sieve particles. Generally, the acrylates, styrene-butadiene, polyurethanes and other adhesives with good bonding effects that are often used in the industry are selected. However, with the thinning of electronic consumer products, the volume and thickness left for the speaker are increasingly compressed, resulting in the speaker back cavity becoming thinner and irregular. The partition structure between the monomer and the back cavity inside the speaker cavity, such as the flexible polymer mesh cloth, has been replaced by an integrated metal mesh, that is, the metal thin mesh is directly integrated with the monomer. This structural design can save the volume of the back cavity, but it will cause the acoustic enhancement material to directly rub against the rigid multi-angle metal mesh, resulting in significant wear and tear, and higher requirements for the strength and anti-powdering of the acoustic enhancement material. In addition, although the volume of the speaker is getting smaller and smaller, the requirements for its power effect are increasing, that is, small volume and large sound effect. The amplitude of the speaker is getting larger and larger, and the back cavity is shrinking, resulting in more and more drastic changes in the sound pressure of the back cavity. The vibration and friction of the acoustic enhancement material in the back cavity are also becoming more and more intense, and the wear and powdering are becoming more serious. This change also increases the requirements for the strength of the acoustic enhancement material. In order to meet the above two requirements, the binder content can generally only be increased to make the acoustic enhancement material meet the strength and powdering requirements, but this will cause its acoustic performance to be sacrificed to a certain extent; another common way to improve strength used in this field is to seek a better and more matching binder with better bonding performance, but this aspect is more difficult and has become a bottleneck, and progress is extremely slow.

[0005] Therefore, providing a new type of anti-powder leakage acoustic enhancement material with a breathable barrier membrane, a loudspeaker and an electronic device has become a technical problem that urgently needs to be solved in the field. Utility Model Content

[0006] In order to solve the above shortcomings and deficiencies, the purpose of the utility model is to provide a powder leakage-proof acoustic enhancement material with a breathable barrier membrane, a loudspeaker, and an electronic device. The powder leakage-proof acoustic enhancement material with a breathable barrier membrane provided by the utility model can prevent powder leakage without occupying precious loudspeaker back cavity space, and does not need to increase the amount of binder to increase strength and prevent powder loss and partially sacrifice acoustic performance. It can even reduce the amount of binder to a certain extent, improve the utilization rate of the loudspeaker back cavity, and increase the filling amount of acoustic enhancement material per unit back cavity volume, thereby improving acoustic performance to a certain extent.

[0007] To achieve the above object, on the one hand, the present utility model provides a powder leakage-proof acoustic enhancement material with a breathable barrier film. Among them, the powder leakage-proof acoustic enhancement material with a breathable barrier film includes a basic acoustic enhancement material and a breathable barrier film covering or wrapping the basic acoustic enhancement material. Among them, the Gurley-air permeability (s / 100cc) of the breathable barrier film is less than 10 s, preferably less than 4 s, more preferably less than 1 s, the thickness is less than 80 μm, preferably less than 60 μm, more preferably less than 50 μm, further preferably less than 40 μm, and most preferably less than 30 μm, and the maximum pore diameter is not greater than 50 μm, preferably less than 20 μm, more preferably less than 10 μm.

[0008] The breathable barrier film in the powder leakage-proof acoustic enhancement material with a breathable barrier film provided by the present utility model has small pores and can adapt to the entry and exit of high-frequency air molecules.

[0009] As a specific embodiment of the powder leakage-proof acoustic enhancement material with a breathable barrier film described above in the present utility model, among them, the porosity of the breathable barrier film is not less than 50%, preferably greater than 65%.

[0010] As a specific embodiment of the powder leakage-proof acoustic enhancement material with a breathable barrier film described above in the present utility model, among them, the material of the breathable barrier film includes polypropylene (PP), polyethylene terephthalate (PET), or polyimide (PI), etc.

[0011] As a specific embodiment of the powder leakage-proof acoustic enhancement material with a breathable barrier film described above in the present utility model, among them, the breathable barrier film includes a planar structure and / or a curved surface structure. For example, when the shape of the basic acoustic enhancement material is block-shaped and the cross-section of the block is a rounded rectangle, the breathable barrier film includes both a planar structure and a curved surface structure at this time.

[0012] As a specific embodiment of the powder leakage-proof acoustic enhancement material with a breathable barrier film described above in the present utility model, among them, the shape of the basic acoustic enhancement material includes one or a combination of more of block-shaped, sheet-shaped, microspheres, or particles, etc.

[0013] As a specific embodiment of the powder leakage-proof acoustic enhancement material with a breathable barrier film described above in the present utility model, among them, the basic acoustic enhancement material includes a porous material.

[0014] As a specific embodiment of the anti-leakage powder acoustic enhancement material with a breathable barrier film described above for the present utility model, among them, the porous material includes one or more porous materials with acoustic properties such as zeolite molecular sieve, MOF, COF, activated carbon, aerogel, and hydrogel. Among them, zeolite molecular sieve, MOF, COF, activated carbon, aerogel, and hydrogel are all conventional existing materials, and can all be obtained through regular commercial purchase, or can be self-made by adopting existing conventional preparation methods.

[0015] As a specific embodiment of the anti-leakage powder acoustic enhancement material with a breathable barrier film described above for the present utility model, among them, the zeolite molecular sieve is a high-silica molecular sieve, where the Si / M molar ratio is greater than 30, and where M is a non-silicon element.

[0016] As a specific embodiment of the anti-leakage powder acoustic enhancement material with a breathable barrier film described above for the present utility model, among them, M includes Al, B, Ga, Ti, Zr, etc.

[0017] As a specific embodiment of the anti-leakage powder acoustic enhancement material with a breathable barrier film described above for the present utility model, among them, the basic acoustic enhancement material further includes a framework structure matrix.

[0018] As a specific embodiment of the anti-leakage powder acoustic enhancement material with a breathable barrier film described above for the present utility model, among them, the framework structure matrix includes one or more combinations of fiber, foaming material, or elastic material, etc. Among them, fiber, foaming material, and elastic material are all conventional existing materials, and can all be obtained through regular commercial purchase, or can be self-made by adopting existing conventional preparation methods.

[0019] In order to introduce as few fibers as possible into the acoustic enhancement material, as a specific embodiment of the anti-leakage powder acoustic enhancement material with a breathable barrier film described above for the present utility model, among them, the diameter of the fiber is less than 40 μm, preferably less than 10 μm, and more preferably less than 6 μm.

[0020] In order to ensure the acoustic performance of the acoustic enhancement material while improving its structural strength (i.e., enhancing the structural stability of the acoustic enhancement material), it is necessary to introduce as few non-porous material components into the acoustic enhancement material as possible, that is, to introduce as few framework structure matrices such as fibers and air-permeable barrier films as possible (corresponding to the thickness of the air-permeable barrier film being as thin as possible). As a specific embodiment of the leak-proof powder acoustic enhancement material with an air-permeable barrier film described above in the present invention, the mass ratio of the framework structure matrix such as fibers to the porous material such as zeolite molecular sieve is less than 1:5, preferably less than 1:10, more preferably less than 1:20, and further preferably less than 1:40. Among them, the small amount of framework structure matrix such as fibers added to the acoustic enhancement material mainly plays the role of improving the structural strength of the acoustic enhancement material.

[0021] As a specific embodiment of the leak-proof powder acoustic enhancement material with an air-permeable barrier film described above in the present invention, the fiber includes natural fiber or chemical fiber.

[0022] As a specific embodiment of the leak-proof powder acoustic enhancement material with an air-permeable barrier film described above in the present invention, the natural fiber includes plant fiber, animal fiber or mineral fiber, etc., such as cotton, hemp, pulp, wool, silk, asbestos, etc.; the chemical fiber includes man-made fiber (also known as regenerated fiber), synthetic fiber, inorganic chemical fiber, and also includes composite fibers obtained by combining two or more fibers, such as acetate fiber, regenerated cellulose fiber, regenerated protein fiber, polyester fiber, polyamide fiber, polyvinyl alcohol fiber, polyacrylonitrile fiber, polypropylene fiber, polyethylene fiber, polyvinyl chloride fiber, polyvinylidene fluoride fiber, polyphenylene sulfide fiber, polyimide (PI) fiber, PTFE fiber, polyamide-imide (PAI) fiber, aromatic polyamide fiber, polytetrafluoroethylene fiber, polybenzimidazole fiber, polyether ether ketone (PEEK) fiber, polypropylene-polyester fiber obtained by compounding polypropylene and polyester fiber, polyethylene-polyester fiber obtained by compounding polyethylene and polyester, polyethylene-polypropylene fiber obtained by compounding polyethylene and polypropylene, glass fiber, metal fiber and carbon fiber, etc. Preferably, the fiber is a composite fiber, and more preferably a composite fiber formed by two materials with different melting points. Among them, the composite fiber can be in the form of skin-core composition or other combined forms. For the composite fiber in the form of skin-core composition, generally the core layer is a high-melting-point fiber and the skin layer is a low-melting-point fiber. During the curing and crosslinking process, it is generally necessary to heat to near the melting point of the skin layer fiber for crosslinking, and it is also necessary to make the heating temperature significantly lower than the melting point of the core layer fiber, so as to ensure both crosslinking and the stability of the fiber morphology without completely melting and losing the fiber morphology.

[0023] In some embodiments of the present utility model, the composite fiber includes, but is not limited to, PE / PP, PE / PET, or PP / PET, etc.

[0024] In some embodiments of the present utility model, the basic acoustic enhancement material may be zeolite molecular sieve raw powder, which only contains zeolite molecular sieve, generally with a size below 30 μm (preferably 1 - 10 μm), and can be obtained by conventional preparation methods in the industry such as hydrothermal synthesis. In some embodiments of the present utility model, the basic acoustic enhancement material is zeolite molecular sieve particles, microspheres, flakes or blocks obtained by molding zeolite molecular sieve raw powder and inorganic / organic adhesives as raw materials. In some embodiments of the present utility model, the basic acoustic enhancement material is zeolite molecular sieve particles, microspheres, flakes or blocks obtained by molding zeolite molecular sieve raw powder, inorganic / organic adhesives and a framework structure matrix as raw materials. In some embodiments of the present utility model, the basic acoustic enhancement material is zeolite molecular sieve particles, microspheres, flakes or blocks obtained by molding zeolite molecular sieve raw powder and a framework structure matrix as raw materials. In some embodiments of the present utility model, the basic acoustic enhancement material is zeolite molecular sieve microspheres, flakes or blocks obtained by molding zeolite molecular sieve particles and a framework structure matrix as raw materials. In some embodiments of the present utility model, the basic acoustic enhancement material is zeolite molecular sieve particles containing only zeolite molecular sieve obtained by secondary crystallization of zeolite molecular sieve raw powder.

[0025] On the other hand, the present utility model also provides a loudspeaker, which includes one or more acoustic sensors and one or more outer casings. The one or more acoustic sensors and the one or more outer casings are combined to form a rear cavity of the loudspeaker. Among them, the above-mentioned leak - proof powder acoustic enhancement material with a breathable barrier film is assembled in the rear cavity of the loudspeaker.

[0026] On yet another aspect, the present utility model also provides an electronic device, wherein the loudspeaker of the electronic device is the above - mentioned loudspeaker.

[0027] In the present utility model, the above - mentioned electronic device can be any electronic device containing a loudspeaker system. As a specific embodiment of the above - mentioned electronic device of the present utility model, the electronic device includes electronic consumer products such as smart phones, TWS earphones, head - mounted earphones, smart glasses, smart watches, VR devices, AR devices, tablet computers, thin and light laptops, etc., or audio devices such as speakers. Among them, the speaker includes a home - use speaker or a vehicle - mounted speaker, etc.

[0028] Compared with the prior art, the beneficial technical effects that the present utility model can achieve include:

[0029] The leak - proof powder acoustic enhancement material with a breathable barrier film provided by the present utility model can meet the requirement of no powder leakage under harsh strength requirements, and in a limited speaker cavity space, the amount of binder in the acoustic enhancement material can be reduced. On the one hand, the influence of the binder on the acoustic performance can be significantly reduced. On the other hand, the proportion of porous materials such as zeolite molecular sieve in the acoustic enhancement material can be further increased, further increasing the acoustic compliance of the air in the speaker rear cavity, thereby improving the performance of the speaker in the low - frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following - described drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 FIG. is a schematic structural diagram of the leak - proof powder acoustic enhancement material with a breathable barrier film provided in Embodiment 4 of the present utility model.

[0032] Figure 2 FIG. is a schematic structural diagram of the leak - proof powder acoustic enhancement material with a breathable barrier film provided in Embodiment 9 of the present utility model.

[0033] Figures 3 - 5 FIG. is a SEM diagram of the breathable barrier film used in Embodiments 1 and 2 of the present utility model.

[0034] Figures 6 - 8 FIG. is a SEM diagram of the breathable barrier film used in Embodiment 3 of the present utility model.

[0035] Figures 9 - 11 FIG. is a SEM diagram of the breathable barrier film used in Embodiment 4 of the present utility model.

[0036] MAIN REFERENCE NUMERAL DESCRIPTIONS:

[0037] 1. Breathable barrier film;

[0038] 10. First breathable barrier film;

[0039] 11. Second breathable barrier film;

[0040] 20. Basic acoustic enhancement material. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] It should be noted that the term "including" and any of its variations in the description, claims and the above-mentioned drawings of the present utility model are intended to cover non-exclusive inclusion. For example, a process, method / technique, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods / techniques, products or devices.

[0042] In the present utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "middle", "top" and "bottom" is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present utility model and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application.

[0043] Moreover, in addition to being used to represent the orientation or positional relationship, some of the above-mentioned terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to specific circumstances.

[0044] In addition, in the description of this application, unless otherwise clearly defined, the terms "arranged", "connected or joined" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present utility model can be understood according to specific circumstances.

[0045] The "range" disclosed in the present utility model is given in the form of a lower limit and an upper limit. There can be one or more lower limits, and one or more upper limits respectively. A given range is defined by selecting a lower limit and an upper limit. The selected lower limit and upper limit define the boundary of a particular range. All ranges defined in this way are combinable, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60 - 120 and 80 - 110 are listed for a specific parameter, it is understood that ranges of 60 - 110 and 80 - 120 are also expected. In addition, if the minimum range values listed are 1 and 2, and the maximum range values listed are 3, 4 and 5, then the following ranges are all expected: 1 - 3, 1 - 4, 1 - 5, 2 - 3, 2 - 4 and 2 - 5.

[0046] In the present utility model, unless otherwise specified, the numerical range "a - b" represents an abbreviated representation of any real number combination between a and b, where both a and b are real numbers. For example, the numerical range "0 - 5" means that all real numbers between "0 - 5" are fully listed in the present utility model, and "0 - 5" is just an abbreviated representation of these numerical combinations.

[0047] In the present utility model, if there is no special instruction, all the embodiments and preferred embodiments mentioned in the present utility model can be combined with each other to form a new technical solution.

[0048] In the present utility model, if there is no special instruction, all the technical features and preferred features mentioned in the present utility model can be combined with each other to form a new technical solution.

[0049] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The following described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments, and are only used to illustrate the present utility model and should not be regarded as limiting the scope of the present utility model. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation to the present application. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model. For those conditions not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments whose manufacturers are not specified, they are all conventional products that can be obtained through commercial purchase.

[0050] The acoustic enhancement materials used in the embodiments of the present utility model are as follows:

[0051] Acoustic enhancement material in the form of raw powder: ZSM-5 type zeolite molecular sieve, spherical, with a size (diameter) of 10 μm, a molar ratio of silicon to aluminum elements of 300, and a micropore size of 0.5 - 0.7 nm.

[0052] The first particulate acoustic enhancement material: Prepared from the aforementioned acoustic enhancement material in the form of raw powder and polyurethane adhesive, spherical or quasi-spherical, with a size (diameter) of 250 - 350 μm, and the content of polyurethane adhesive accounting for 10% wt of the total weight of the first particulate acoustic enhancement material.

[0053] The second granular form acoustic enhancement material: Prepared from the aforementioned powder form acoustic enhancement material and polyurethane adhesive as raw materials, spherical or quasi-spherical, with a size (diameter) of 100 - 200 μm, and the content of polyurethane adhesive accounting for 10% wt of the total weight of the second granular form acoustic enhancement material.

[0054] The third granular form acoustic enhancement material: Prepared from the aforementioned powder form acoustic enhancement material and polyurethane adhesive as raw materials, spherical or quasi-spherical, with a size (diameter) of 250 - 350 μm, and the content of polyurethane adhesive accounting for 3% wt of the total weight of the third granular form acoustic enhancement material.

[0055] The fourth granular form acoustic enhancement material: Prepared from the aforementioned powder form acoustic enhancement material and silica sol adhesive as raw materials, spherical or quasi-spherical, with a size (diameter) of 250 - 350 μm, and the content of silica sol adhesive accounting for 3% wt of the total weight of the first granular form acoustic enhancement material.

[0056] The fifth granular form acoustic enhancement material: It is zeolite molecular sieve particles containing only zeolite molecular sieve obtained by secondary crystallization (180 °C) of the aforementioned powder form acoustic enhancement material, with a particle size of 250 - 350 μm.

[0057] The sheet form acoustic enhancement material: Prepared from the aforementioned first granular form acoustic enhancement material and PE / PET composite fiber as raw materials, after pulping and stirring the two, casting and molding, and then curing, with a size of 0.5 mm × 10 mm × 10 mm.

[0058] The block form acoustic enhancement material: Prepared from the aforementioned first granular form acoustic enhancement material, polyurethane adhesive, and PE / PP composite fiber as raw materials, after pulping and stirring the three, molding in a mold and then curing, with a size of 8 mm × 10 mm × 10 mm.

[0059] The selection of the above acoustic enhancement materials is only used to illustrate the technical solution of the present invention and its outstanding technical effects, and is not used to limit the protection scope of the present invention. Those of ordinary skill in the art can select the form, size, core components, etc. of the acoustic enhancement material according to needs to achieve the design purpose of the speaker module.

[0060] Example 1

[0061] This example provides a leak-proof powder acoustic enhancement material with a breathable barrier film, which includes a basic acoustic enhancement material and a breathable barrier film tightly coating / wrapping the basic acoustic enhancement material. Among them, the basic acoustic enhancement material is the above-mentioned block form acoustic enhancement material, the material of the breathable barrier film is PP, the thickness is 30 μm, the maximum pore diameter is 50 μm, the porosity is 85%, and the Gurley permeability is 0.1 s. The SEM diagram of this breathable barrier film is asFigures 3 - 5 As shown in Figures 3 - 5 it can be seen that the pores of the breathable barrier film overlap and cross each other.

[0062] The preparation method of the anti-leakage powder acoustic enhancement material with a breathable barrier film provided in this embodiment includes: wrapping and heat-sealing the block-shaped acoustic enhancement material with the breathable barrier film on a coating machine to obtain an anti-leakage powder high-efficiency acoustic enhancement material tightly wrapped with the breathable barrier film (which is the anti-leakage powder breathable barrier component).

[0063] Comparative Example 1

[0064] This comparative example provides a block-shaped acoustic enhancement material tightly wrapped with a mesh cloth, which includes a basic acoustic enhancement material and a mesh cloth tightly covering / wrapping the basic acoustic enhancement material. Among them, the basic acoustic enhancement material is the above-mentioned block-shaped acoustic enhancement material, and the mesh cloth is a commercially available conventional product with a model of SMESH B10. The thickness of this mesh cloth is 105 μm, the pore diameter is 120 μm, the porosity is 41%, and the Gurley air permeability is 0.3 s.

[0065] The preparation method of the block-shaped acoustic enhancement material tightly wrapped with the mesh cloth provided in this comparative example includes: wrapping and heat-sealing the block-shaped acoustic enhancement material with the above-mentioned commercially available conventional mesh cloth on a coating machine to obtain a block-shaped acoustic enhancement material tightly wrapped with the mesh cloth.

[0066] Example 2

[0067] This example provides an anti-leakage powder acoustic enhancement material with a breathable barrier film, which includes a basic acoustic enhancement material and a breathable barrier film tightly covering / wrapping the basic acoustic enhancement material. Among them, the basic acoustic enhancement material is the above-mentioned first particle-shaped acoustic enhancement material, and the material of the breathable barrier film is PP, with a thickness of 30 μm, a maximum pore diameter of 50 μm, a porosity of 85%, and a Gurley air permeability of 0.1 s. The SEM diagram of this breathable barrier film is as shown in Figures 3 - 5 As shown in Figures 3 - 5 it can be seen that the pores of the breathable barrier film overlap and cross each other.

[0068] The preparation method of the anti-leakage powder acoustic enhancement material with a breathable barrier film provided in this example includes: prefabricating the breathable barrier film into an open container, then filling the first particle-shaped acoustic enhancement material into it and heat-sealing to complete the packaging, obtaining an anti-leakage powder high-efficiency acoustic enhancement material tightly wrapped with the breathable barrier film (which is the anti-leakage powder breathable barrier component).

[0069] Comparative Example 2

[0070] In this comparative example, a commercially available conventional mesh product was first assembled in the rear cavity of a commercially available 1115-type speaker, and it was hermetically connected to the side wall shells of the rear cavity, so as to jointly form a cavity with the side wall shells of the rear cavity that can be used to fill the above-mentioned first particulate acoustic enhancement material. Among them, the volume of the tooling rear cavity of the commercially available 1115-type speaker is 1 cubic centimeter (also known as 1 cc). This cavity separates the particulate acoustic enhancement material from the speaker unit. A certain amount of the above-mentioned first particulate acoustic enhancement material was filled through the powder filling hole provided on the rear cavity. Among them, the model of the commercially available conventional mesh product is SMESH B20, the thickness of this mesh is 62 μm, the pore size is 68 μm, the porosity is 38%, and the Gurley air permeability is 0.5 s.

[0071] Example 3

[0072] This example provides a leak-proof powder acoustic enhancement material with a breathable barrier film, which includes a basic acoustic enhancement material and a breathable barrier film tightly covering / wrapping the basic acoustic enhancement material. Among them, the basic acoustic enhancement material is the above-mentioned raw powder form acoustic enhancement material, the material of the breathable barrier film is PI, the thickness is 40 μm, the maximum pore size is 30 μm, the porosity is 65%, and the Gurley air permeability is 0.3 s. The SEM diagram of this breathable barrier film is as Figures 6 - 8 shown. It can be seen from Figures 6 - 8 that the pore channels of this breathable barrier film also overlap and cross.

[0073] The preparation method of the leak-proof powder acoustic enhancement material with a breathable barrier film provided in this example includes: prefabricating the breathable barrier film into an open container, then filling the raw powder form acoustic enhancement material into it and heat-sealing to complete the packaging, to obtain a leak-proof powder high-efficiency acoustic enhancement material tightly wrapped by the breathable barrier film (which is the leak-proof powder breathable barrier part).

[0074] Example 4

[0075] This example provides a leak-proof powder acoustic enhancement material with a breathable barrier film. Its structural schematic diagram is as Figure 1 shown, and it includes a basic acoustic enhancement material 20 and a breathable barrier film 1 tightly covering / wrapping the basic acoustic enhancement material. Among them, the basic acoustic enhancement material 20 is the above-mentioned sheet form acoustic enhancement material, the material of the breathable barrier film 1 is PET, the thickness is 45 μm, the maximum pore size is 40 μm, the porosity is 50%, and the Gurley air permeability is 0.4 s. The SEM diagram of this breathable barrier film 1 is as Figures 9 - 11 shown. It can be seen from Figures 9 - 11 that the pore channels of this breathable barrier film 1 also overlap and cross.

[0076] The preparation method of the anti-leakage powder acoustic enhancement material with a breathable barrier film provided by this embodiment includes: laminating multiple sheet-shaped acoustic enhancement materials and wrapping and heat-sealing them with a breathable barrier film on a coating machine to obtain an anti-leakage powder high-efficiency acoustic enhancement material tightly wrapped by the breathable barrier film (which is the anti-leakage powder breathable barrier component).

[0077] Test Example 1

[0078] In this test example, first, the anti-leakage powder acoustic enhancement materials with a breathable barrier film provided in Embodiments 1-4 of the present invention and the block-shaped acoustic enhancement material tightly wrapped with a mesh cloth provided in Comparative Example 1 are respectively assembled into the rear cavity of a commercially available 1115-type speaker. Among them, the volume of the rear cavity of the commercially available 1115-type speaker tooling is 1 cubic centimeter (also known as 1 cc). Then, the acoustic performance of these commercially available 1115-type speakers and the commercially available 1115-type speaker provided in Comparative Example 2 is tested by using existing conventional testing methods.

[0079] This test example also conducts a drop structure stability test on the anti-leakage powder acoustic enhancement materials with a breathable barrier film provided in Embodiments 1-4 of the present invention, the block-shaped acoustic enhancement material tightly wrapped with a mesh cloth provided in Comparative Example 1, and the first particle-shaped acoustic enhancement material filled in a cavity separated by a mesh cloth provided in Comparative Example 2. Among them, the drop structure stability test includes Drop Method 1 and Drop Method 2 carried out continuously:

[0080] Specifically, Drop Method 1 includes: placing the sample to be tested in a 250 g drop tooling (with a length, width, and height of approximately 160 mm × 100 mm × 90 mm respectively, made of 316L, and the upper cover of the sample slot is flat without protruding edges and corners) and freely dropping it from a height of 10 cm for 48,000 times (20,000 times for each of the front and back sides, and 2,000 times for each of the four side edges); after the drop is completed, disassemble it and observe the powder leakage situation of the sample to judge whether the material strength meets the requirements;

[0081] Specifically, Drop Method 2 includes: compared with Drop Method 1, changing the drop height parameter to 160 cm and freely dropping it 600 times (200 times for each of the front and back sides, and 50 times for each of the four side edges); after the drop is completed, disassemble it and observe the powder leakage situation of the sample to judge whether the material strength meets the requirements.

[0082] Finally, in this test example, the samples after completing the tests of Drop Method 1 and Drop Method 2 are reassembled into the rear cavity of a commercially available 1115-type speaker or into the cavity formed by a commercially available conventional mesh cloth and the side wall shell of the rear cavity in Comparative Example 2. Among them, the volume of the rear cavity of the commercially available 1115-type speaker tooling is 1 cubic centimeter (also known as 1 cc). Then, the acoustic performance of these commercially available 1115-type speakers is tested by using existing conventional testing methods.

[0083] In this test example, the data involved in the acoustic performance test and the drop structure stability test process, as well as the test data, are shown in Table 1 below.

[0084] Table 1

[0085]

[0086]

[0087] Note: In Table 1, OK means passing this test; NG means failing this test; the degree of powder loss deteriorates in turn from no powder loss, slight powder loss, powder loss, to severe powder loss. ΔF01 = F0 空 - F01, ΔF02 = F0 空 - F02.

[0088] As can be seen from Table 1, in the drop test, Comparative Example 1 and Comparative Example 2 can only pass the drop test of the milder Method 1 and both NG in the harsher Method 2 drop test; while Examples 1 - 4 of the present utility model can pass both drop test evaluation methods, which shows that compared with Comparative Example 1 and Comparative Example 2, for Examples 1 - 4 using the breathable barrier film, that is, the leak - proof powder breathable barrier member, the powder loss situation of the provided acoustic enhancement material has been greatly improved, and it can meet the increasingly harsh usage environments, such as the speaker rear cavity with a metal mesh.

[0089] It can also be seen from Table 1 that whether before or after the drop structure stability test, the acoustic performance of the leak - proof powder acoustic enhancement material with a breathable barrier film provided by Examples 1 - 4 of the present utility model is better than that of Comparative Example 1 and Comparative Example 2. And after the leak - proof powder acoustic enhancement material with a breathable barrier film provided by Examples 1 - 4 of the present utility model undergoes the drop structure stability test, its acoustic performance hardly has any loss, while after the drop structure stability test, Comparative Example 1 and Comparative Example 2 have a large loss in acoustic performance and are significantly worse than the acoustic performance of the leak - proof powder acoustic enhancement material with a breathable barrier film provided by Examples 1 - 4 of the present utility model.

[0090] Example 5

[0091] This example provides a leak - proof powder acoustic enhancement material with a breathable barrier film, and its difference from Example 2 is only that the basic acoustic enhancement material is different. The basic acoustic enhancement material used in this example is the second particulate - form acoustic enhancement material described above.

[0092] Example 6

[0093] This embodiment provides a leak-proof powder acoustic enhancement material with a breathable barrier film, which is only different from that of Embodiment 2 in that the basic acoustic enhancement material is different. The basic acoustic enhancement material used in this embodiment is the third particle form acoustic enhancement material described above.

[0094] Test Example 2

[0095] In this test example, the second particle form acoustic enhancement material, the leak-proof powder acoustic enhancement material with a breathable barrier film provided in Embodiment 5, the third particle form acoustic enhancement material, and the leak-proof powder acoustic enhancement material with a breathable barrier film provided in Embodiment 6 are respectively assembled into the rear cavity of a commercially available 1115 type speaker. Among them, the volume of the rear cavity of the commercially available 1115 type speaker tooling is 1 cubic centimeter (also known as 1 cc). When testing the assembly of the second particle form acoustic enhancement material and the third particle form acoustic enhancement material, the rear cavity is first separated by a commercially available conventional mesh cloth in the rear cavity of the speaker tooling, and then the aforementioned materials are filled. The acoustic performance of these commercially available 1115 type speakers is tested by using the existing conventional test methods.

[0096] At the same time, this test example also refers to the method in Test Example 1 to conduct the drop structure stability test on the second particle form acoustic enhancement material, the leak-proof powder acoustic enhancement material with a breathable barrier film provided in Embodiment 5, the third particle form acoustic enhancement material, and the leak-proof powder acoustic enhancement material with a breathable barrier film provided in Embodiment 6 respectively.

[0097] Finally, in this test example, the samples after completing the drop method 1 and drop method 2 tests are reassembled into the rear cavity of the commercially available 1115 type speaker according to the method shown above in this test example. Among them, the volume of the rear cavity of the commercially available 1115 type speaker tooling is 1 cubic centimeter (also known as 1 cc), and then the acoustic performance of these commercially available 1115 type speakers is tested by using the existing conventional test methods.

[0098] In this test example, the data involved in the acoustic performance test and the drop structure stability test process, as well as the test data, are all shown in Table 2 below.

[0099] Table 2

[0100]

[0101] Note: OK means passing this test; NG means failing this test; the degree of powder leakage deteriorates in turn from no powder leakage, slight powder leakage, powder leakage, and serious powder leakage. ΔF01 = F0 空 - F01, ΔF02 = F0 空 - F02.

[0102] As can be seen from Table 2, after adopting the technical solution of the present utility model, even when the microsphere size in the acoustic enhancement material sample is reduced or the glue content is reduced, the acoustic enhancement material sample can still show better effects in the drop test on the premise of ensuring the acoustic performance. Specifically, compared with the acoustic enhancement material with the third particle morphology that cannot pass the drop test by the relatively mild Method 1, the sample provided in Example 6 of the present utility model can pass both the relatively mild Method 1 and the harsh Method 2 drop tests; compared with the acoustic enhancement material with the second particle morphology that cannot pass the drop test by the harsh Method 2, the sample provided in Example 5 of the present utility model can also pass the drop test by the harsh Method 2; that is, the samples provided in Example 5 and Example 6 of the present utility model can both pass the two drop method tests, which indicates that the strength and powder leakage conditions of the material are greatly improved after using the anti-leakage powder breathable barrier, and it can meet the increasingly harsh use environments, such as the rear cavity of a speaker with a metal mesh.

[0103] In addition, as can also be seen from Table 2, after the anti-leakage powder acoustic enhancement materials with breathable barrier films provided in Example 5 and Example 6 of the present utility model are tested for the drop structure stability, their acoustic performance is hardly lost. However, after the acoustic enhancement materials with the second particle morphology and the third particle morphology are tested for the drop structure stability, their acoustic performance losses are relatively large, and their acoustic performance is significantly worse than that of the anti-leakage powder acoustic enhancement materials with breathable barrier films provided in Example 5 and Example 6 respectively.

[0104] Example 7

[0105] This example provides an anti-leakage powder acoustic enhancement material with a breathable barrier film, and the only difference from Example 2 is the different basic acoustic enhancement materials. The basic acoustic enhancement material used in this example is the above-mentioned acoustic enhancement material with the fourth particle morphology.

[0106] Example 8

[0107] This example provides an anti-leakage powder acoustic enhancement material with a breathable barrier film, and the only difference from Example 2 is the different basic acoustic enhancement materials. The basic acoustic enhancement material used in this example is the above-mentioned acoustic enhancement material with the fifth particle morphology.

[0108] Test Example 3

[0109] In this test example, the fourth particulate form acoustic enhancement material, the anti-leakage powder acoustic enhancement material with a breathable barrier film provided in Example 7, the fifth particulate form acoustic enhancement material, and the anti-leakage powder acoustic enhancement material with a breathable barrier film provided in Example 8 were respectively assembled into the rear cavity of a commercially available 1115-type speaker. Among them, the volume of the rear cavity of the commercially available 1115-type speaker tooling is 1 cubic centimeter (also known as 1 cc). When testing the assembly of the fourth particulate form acoustic enhancement material and the fifth particulate form acoustic enhancement material, the rear cavity of the speaker tooling was first partitioned with a commercially available conventional mesh cloth, and then the aforementioned materials were filled. The acoustic performance of these commercially available 1115-type speakers was tested using existing conventional test methods.

[0110] Meanwhile, in this test example, the fourth particulate form acoustic enhancement material, the anti-leakage powder acoustic enhancement material with a breathable barrier film provided in Example 7, the fifth particulate form acoustic enhancement material, and the anti-leakage powder acoustic enhancement material with a breathable barrier film provided in Example 8 were respectively subjected to a drop structure stability test with reference to the method in Test Example 1.

[0111] Finally, the samples after completing the drop method 1 and drop method 2 tests in this test example were reassembled into the rear cavity of the commercially available 1115-type speaker according to the method shown above in this test example. Among them, the volume of the rear cavity of the commercially available 1115-type speaker tooling is 1 cubic centimeter (also known as 1 cc), and then the acoustic performance of these commercially available 1115-type speakers was tested using existing conventional test methods.

[0112] In this test example, the data involved in the acoustic performance test and the drop structure stability test process, as well as the test data, are all shown in Table 3 below.

[0113] Table 3

[0114]

[0115] Note: OK means passing this test; NG means failing this test; the degree of powder leakage deteriorates in turn from no powder leakage, slight powder leakage, powder leakage, and severe powder leakage. ΔF01 = F0 空 - F01, ΔF02 = F0 空 - F02.

[0116] As can be seen from Table 3, compared with the fourth and fifth particulate morphology acoustic enhancement materials, the leak-proof powder acoustic enhancement materials with a breathable barrier film prepared by the technical solutions of Examples 7 and 8 of the present utility model can still show more excellent effects in the drop test while ensuring the acoustic performance. Compared with the microspheres or particles (inorganic binders or secondary crystallized fully crystalline molecular sieve particles) of non-polymer binders with serious powder leakage in the drop test, that is, the fourth and fifth particulate morphology acoustic enhancement materials, the leak-proof powder acoustic enhancement materials provided in Examples 7 and 8 of the present utility model with leak-proof powder breathable barrier members can not only pass the ordinary drop test, but also pass the stringent drop test. This not only enables the non-polymer binder microspheres or particles that could not be practically applied due to powder leakage to be practically applied, but also the presence of the polymer binder will block the surface of the zeolite molecular sieve and limit the further increase of the density of the particles or microspheres. In the field of electronic consumer products such as mobile phones, the limiting factor for the speaker cavity is volume, not mass. Through the technical solution provided by the present utility model, an acoustic enhancement material with better acoustic performance and better strength can be developed.

[0117] In addition, as can also be seen from Table 3, after the leak-proof powder acoustic enhancement materials with a breathable barrier film provided in Examples 7 and 8 of the present utility model are tested for the structural stability of the drop, their acoustic performance is hardly lost. After the fourth and fifth particulate morphology acoustic enhancement materials are tested for the structural stability of the drop, their acoustic performance is greatly lost, and their acoustic performance is significantly worse than that of the leak-proof powder acoustic enhancement materials with a breathable barrier film provided in Examples 7 and 8 respectively.

[0118] Example 9

[0119] This example provides a leak-proof powder acoustic enhancement material with a breathable barrier film, and its structural schematic diagram is as Figure 2 shown, including a basic acoustic enhancement material 20 and two breathable barrier films, respectively denoted as the first breathable barrier film 10 and the second breathable barrier film 11. Among them, the basic acoustic enhancement material 20 is a sheet-shaped acoustic enhancement material formed by the above-mentioned raw powder form acoustic enhancement material, and the first breathable barrier film 10 and the second breathable barrier film 11 respectively cover the upper surface and the lower surface of the basic acoustic enhancement material 20. The two breathable barrier films are made of the same material, both are PI, with a thickness of 40μm, a maximum pore diameter of 30μm, a porosity of 65%, and a Gurley permeability of 0.3s.

[0120] The preparation method of the anti-leakage powder acoustic enhancement material with a breathable barrier film provided by this embodiment includes: first, dispersing the acoustic enhancement material in the form of raw powder in a solvent to form a viscous slurry (calculated based on the total weight of the viscous slurry being 100%, the mass ratio of the acoustic enhancement material in the form of raw powder is 70%), then directly coating a 200-μm-thick slurry on the second breathable barrier film, then covering the first breathable barrier film on the slurry, and then performing rolling drying and slitting. The slitting edges are bonded and sealed with glue to obtain the anti-leakage powder acoustic enhancement material with a breathable barrier film.

[0121] Test Example 4

[0122] In this test example, first, the anti-leakage powder acoustic enhancement materials with breathable barrier films provided in Example 9 are stacked in multiple layers and then loaded into the rear cavity of a commercially available 1115-type speaker. Among them, the volume of the tooling rear cavity of the commercially available 1115-type speaker is 1 cubic centimeter (also known as 1 cc). Then, the acoustic performance of this commercially available 1115-type speaker is tested using existing conventional testing methods.

[0123] Meanwhile, this test example also refers to the method in Test Example 1 to conduct a drop structure stability test on the anti-leakage powder acoustic enhancement material with a breathable barrier film provided in Example 9.

[0124] Finally, in this test example, the samples after completing the drop method 1 and drop method 2 tests are reassembled into the rear cavity of the commercially available 1115-type speaker according to the method shown above in this test example. Among them, the volume of the tooling rear cavity of the commercially available 1115-type speaker is 1 cubic centimeter (also known as 1 cc). Then, the acoustic performance of this commercially available 1115-type speaker is tested using existing conventional testing methods.

[0125] In this test example, the data involved in the acoustic performance test and the drop structure stability test process, as well as the test data, are all shown in Table 4 below.

[0126] Table 4

[0127]

[0128] Remarks: OK means passing this test. ΔF01 = F0 空 - F01, ΔF02 = F0 空 - F02.

[0129] As can be seen from Table 4, for the anti-leakage powder acoustic enhancement material with a breathable barrier film provided in Embodiment 9 of the present invention, it can also pass the drop structure stability tests conducted according to Method 1 and Method 2. The test results show that there is no powder leakage and no fragmentation, and after the drop structure stability test, its acoustic performance has almost no loss.

[0130] As can be seen from Embodiment 3 and Embodiment 9 of the present utility model, as well as Table 1 and Table 4, the present utility model can tightly wrap the powder leakage prevention and air permeable barrier member, i.e., the air permeable barrier film, on the multi-layer sheet-shaped acoustic enhancement material to form an integral body filled in the rear cavity, that is, the powder leakage prevention acoustic enhancement material with an air permeable barrier film in Embodiment 3. It is also possible to bond the powder leakage prevention and air permeable barrier member, i.e., the air permeable barrier film, with the single-layer sheet-shaped acoustic enhancement material to obtain the powder leakage prevention acoustic enhancement material with an air permeable barrier film, and then stack multiple layers of the powder leakage prevention acoustic enhancement material with an air permeable barrier film and fill them in the rear cavity. At the same time, the thickness of the powder leakage prevention acoustic enhancement material with an air permeable barrier film filled in the rear cavity can be adjusted according to actual design requirements, so that it can be applied to fill particularly narrow cavity spaces with little impact on acoustic performance.

[0131] The above are only specific embodiments of the present utility model and cannot be used to limit the scope of implementation of the utility model. Therefore, the replacement of equivalent components or equivalent changes and modifications made according to the scope of protection of the present utility model patent should still fall within the scope covered by this patent.

Claims

1. A leak-proof powder-proof acoustic enhancement material with a breathable barrier film, characterized in that, The leak-proof powder acoustic enhancement material with a breathable barrier film comprises a basic acoustic enhancement material and a breathable barrier film covering or coating the basic acoustic enhancement material. Among them, the Gurley air permeability of the breathable barrier film is less than 10 s, the thickness is less than 80 μm, and the maximum pore diameter is not more than 50 μm.

2. The leak-proof powder-proof acoustic enhancement material with a breathable barrier film according to claim 1, wherein The porosity of the breathable barrier film is not less than 50%.

3. The leak-proof powder-proof acoustic enhancement material with a breathable barrier film according to claim 1 or 2, characterized in that, The material of the breathable barrier film includes polypropylene, polyethylene terephthalate or polyimide.

4. The leak-proof powder-proof acoustic enhancement material with a breathable barrier film according to claim 1 or 2, characterized in that, The breathable barrier film includes a planar structure and / or a curved surface structure.

5. The leak-proof powder-proof acoustic enhancement material with a breathable barrier film according to claim 1, characterized in that, The shape of the basic acoustic enhancement material includes one or a combination of more than one of block, sheet, microsphere or particle.

6. The leak-proof powder-proof acoustic enhancement material with a breathable barrier film according to claim 1, characterized in that The basic acoustic enhancement material includes a porous material.

7. The leak-proof powder-proof acoustic enhancement material with a breathable barrier film according to claim 6, characterized in that, The porous material includes zeolite molecular sieve, MOF, COF, activated carbon, aerogel or hydrogel.

8. The leak-proof powder-proof acoustic enhancement material with a breathable barrier film according to claim 6 or 7, characterized in that, The basic acoustic enhancement material further includes a framework structure matrix.

9. The leak-proof powder-proof acoustic enhancement material with a breathable barrier film according to claim 8, characterized in that, The framework structure matrix includes fiber, foaming material or elastic material.

10. The leak-proof powder-proof acoustic enhancement material with a breathable barrier film according to claim 9, wherein The diameter of the fiber is less than 40 μm.

11. A loudspeaker, comprising one or more acoustic sensors and one or more enclosures, wherein the one or more acoustic sensors and the one or more enclosures are combined to form a rear cavity of the loudspeaker, characterized in that, The leak-proof powder acoustic enhancement material with a breathable barrier film according to any one of claims 1-10 is assembled in the rear cavity of the speaker.

12. An electronic device, characterized in that, The speaker of the electronic device is the speaker according to claim 11.

13. The electronic device according to claim 12, characterized in that, The electronic device includes a smart phone, TWS earphone, headphone, smart glasses, smart watch, VR device, AR device, tablet computer, thin and light notebook computer or audio.

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