Loudspeaker with rear cavity provided with powder-leakage-proof breathable barrier and electronic equipment

Abstract

The utility model provides a loudspeaker and an electronic device with a rear cavity assembled with a powder-leakage-proof breathable barrier, the powder-leakage-proof breathable barrier is arranged between the rear cavity of a loudspeaker module and a loudspeaker monomer, and a closed space used for being filled with an acoustic reinforcing material is formed between the powder-leakage-proof breathable barrier and the rear cavity of the loudspeaker module; the powder leakage prevention breathable barrier piece comprises a breathable barrier film, the Gurley method air permeability of the breathable barrier film is smaller than 10 s, the thickness of the breathable barrier film is smaller than 80 micrometers, and the maximum aperture of the breathable barrier film is not larger than 50 micrometers. Compared with the prior art, the loudspeaker provided by the utility model is provided with the powder-leakage-proof breathable barrier, so that on the premise of realizing powder leakage prevention, the precious space of the rear cavity of the loudspeaker is not occupied additionally, the situation that the acoustic performance is partially sacrificed when the amount of a binder is increased to improve the strength and prevent powder falling is avoided, and even the amount of the binder can be reduced to a certain extent; 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 loudspeaker and an electronic device whose rear cavity is equipped with a powder leakage-proof and breathable barrier, and belongs to the technical field of loudspeaker devices. Background Art

[0002] With the advancement of technology, people's expectations for speakers are becoming increasingly high, especially for mobile phone speakers. They no longer simply demand a small size and loud sound; they increasingly demand excellent sound quality within a compact package. Sound quality is closely linked to every aspect of the speaker design and manufacturing process, particularly the size of the speaker's rear cavity. Typically, a smaller speaker's rear cavity significantly reduces low-frequency response, resulting in poor sound quality. Therefore, it's difficult to achieve excellent sound quality within a very small rear cavity.

[0003] To address this contradiction, engineers have proposed various approaches, including: 1) replacing air with a more acoustically compliant gas as the back cavity atmosphere; 2) filling the back cavity with traditional high-porosity, low-density porous materials, such as melamine foam, open-cell polyurethane sponge, and aerogel, to increase acoustic compliance; and 3) filling the back cavity with porous materials containing micropores (micropores here refer to pores with a diameter of less than 2nm, as defined by the International Union of Pure and Applied Chemistry, rather than the micropores of microporous plates or the more macroscopic acoustic micropores commonly known in the acoustic field) such as activated carbon, zeolite, and silica, to increase the volume of the virtual back cavity and improve acoustic compliance. The third technical approach has been the most effective.

[0004] For example, EP2424270A discloses an acoustic enhancement material, which is a material obtained by adding 1-20% of a polymer binder or glue to 0.5-2 μm zeolite molecular sieve raw powder or particles to form zeolite particles with 1-30 μm air permeability. The addition of polymer binders 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 the zeolite particles, it is necessary to reduce the influence of the polymer binder or glue. In addition to improving the quality of the zeolite particles, it is also necessary to use as little binder as possible to bond the zeolite molecular sieve particles together. Generally, the industry generally selects adhesives with good bonding effects such as acrylates, styrene-butadiene, and polyurethanes with super strong bonding properties. However, as electronic consumer products become thinner and lighter, 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 speaker unit and the back cavity, such as flexible polymer mesh, has been replaced by an integrated metal mesh. In other words, the thin metal mesh is directly integrated with the speaker unit. This structural design can save back cavity volume, but it causes the acoustic reinforcement material to rub directly against the rigid, multi-angle metal mesh, resulting in significant wear and tear, and higher requirements for the strength and anti-powdering resistance of the acoustic reinforcement material. In addition, although the size of speakers is getting smaller and smaller, the requirements for their power efficiency are increasing. In other words, small size, large sound effect. The amplitude of the speaker is getting larger and larger, and the back cavity is shrinking, resulting in more and more dramatic changes in the back cavity sound pressure. The vibration and friction of the acoustic reinforcement 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 strength requirements of the acoustic reinforcement material. To meet these two requirements, the only way is to increase the binder content to make the acoustic reinforcement material meet the strength and powdering requirements, but this will result in a certain degree of sacrifice in its acoustic performance. Another common approach used in the field to improve strength is to seek a binder with better bonding properties and a better match, but this is more difficult and has become a bottleneck, and progress is extremely slow.

[0005] Therefore, providing a new type of loudspeaker and electronic device with a rear cavity equipped with a powder leakage-proof and breathable barrier has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0006] To address the aforementioned shortcomings and deficiencies, the present invention aims to provide a speaker and electronic device with a rear cavity equipped with a powder-leakage-proof, breathable barrier. The speaker provided by the present invention, equipped with a powder-leakage-proof, breathable barrier, prevents powder leakage without taking up valuable space in the speaker's rear cavity. Furthermore, the speaker does not need to increase the amount of binder to improve strength and prevent powder loss, thereby sacrificing acoustic performance. The speaker can even reduce the amount of binder used, improve the utilization rate of the speaker's rear cavity, and increase the amount of acoustic enhancement material per unit rear cavity volume, thereby improving acoustic performance to a certain extent.

[0007] To achieve the above objectives, the present invention provides, on the one hand, a speaker having a rear cavity equipped with a powder leakage-proof breathable barrier, comprising one or more speaker units and one or more housings, wherein the one or more speaker units and the one or more housings are combined to form a speaker module rear cavity, wherein the powder leakage-proof breathable barrier is disposed between the speaker module rear cavity and the speaker units, and a closed space for filling an acoustic enhancement material is formed between the powder leakage-proof breathable barrier and the speaker module rear cavity;

[0008] Among them, the powder leakage-proof breathable barrier includes a breathable barrier membrane, the Gurley-air permeability (s / 100cc) of the breathable barrier membrane is less than 10s, preferably less than 4s, more preferably less than 1s, the thickness is less than 80μm, preferably less than 60μm, more preferably less than 50μm, further preferably less than 40μm, most preferably less than 30μm, the maximum pore size is not greater than 50μm, preferably less than 20μm, more preferably less than 10μm.

[0009] In the above-described loudspeaker of the present invention, the "enclosed space" is not absolute, as the enclosed space is provided with a powder filling hole for filling the acoustic enhancement material. However, after filling the acoustic enhancement material, the powder filling hole is covered with a sealant. In some embodiments of the present invention, the enclosed space may also be provided with a sound leakage hole, which allows air to pass through but prevents the acoustic enhancement material from escaping the enclosed space.

[0010] As a specific embodiment of the above-mentioned speaker of the present invention, the anti-powder leakage breathable barrier comprises a breathable barrier membrane and a fixing member, wherein the fixing member is a frame structure, and the breathable barrier membrane is sleeved on the fixing member to form an anti-powder leakage breathable barrier with a breathable plane.

[0011] The pores of the air-permeable barrier film in the loudspeaker provided by the utility model are small and can adapt to the entry and exit of high-frequency air molecules.

[0012] As a specific embodiment of the above-mentioned loudspeaker of the present invention, the porosity of the breathable barrier membrane is not less than 50%, and preferably greater than 65%.

[0013] As a specific embodiment of the above-mentioned loudspeaker of the present invention, the material of the breathable barrier film includes polypropylene (PP), polyethylene terephthalate (PET) or polyimide (PI) and the like.

[0014] As a specific embodiment of the above-mentioned loudspeaker of the present invention, the breathable barrier membrane includes a planar structure and / or a curved structure.

[0015] As a specific embodiment of the above-mentioned loudspeaker of the present invention, the shape of the acoustic enhancement material includes one or more combinations of blocks, sheets, microspheres or particles.

[0016] As a specific embodiment of the above-mentioned loudspeaker of the present invention, the acoustic enhancement material includes a porous material.

[0017] In a specific embodiment of the above-described speaker of the present invention, the porous material comprises one or more porous materials having acoustic properties, such as zeolite molecular sieve, MOF, COF, activated carbon, aerogel, and hydrogel. Zeolite molecular sieve, MOF, COF, activated carbon, aerogel, and hydrogel are all conventional materials available commercially or can be prepared using conventional methods.

[0018] As a specific embodiment of the above-mentioned loudspeaker of the present invention, the zeolite molecular sieve is a high-silicon molecular sieve, wherein the Si / M molar ratio is greater than 30, and wherein M is a non-silicon element.

[0019] As a specific embodiment of the above-mentioned loudspeaker of the present invention, M includes Al, B, Ga, Ti, Zr, etc.

[0020] In a specific embodiment of the above-described loudspeaker of the present invention, the acoustic enhancement material further comprises a skeleton structure matrix, wherein the skeleton structure matrix comprises one or a combination of fibers, foam materials, or elastic materials. The fibers, foam materials, and elastic materials are all conventionally available materials and can be obtained commercially or prepared in-house using conventional methods.

[0021] In order to introduce as few fibers as possible into the acoustic reinforcement material, as a specific embodiment of the loudspeaker described above in the present invention, the diameter of the fibers is less than 40 μm, preferably less than 10 μm, and more preferably less than 6 μm.

[0022] In order to ensure the acoustic performance of the acoustic enhancement material while improving its structural strength (i.e., improving the structural stability of the acoustic enhancement material), it is necessary to introduce as few non-porous material components as possible into the acoustic enhancement material, that is, to introduce as few fiber and other skeleton structure matrices as possible. As a specific embodiment of the above-mentioned loudspeaker of the present invention, the mass ratio of the fiber and other skeleton structure matrices to the zeolite molecular sieve and other porous materials is less than 1:5, preferably less than 1:10, more preferably less than 1:20, and further preferably less than 1:40. The small amount of fiber and other skeleton structure matrices added to the acoustic enhancement material mainly plays the role of improving the structural strength of the acoustic enhancement material.

[0023] As a specific embodiment of the above-mentioned loudspeaker of the present invention, the fibers include natural fibers or chemical fibers.

[0024] As a specific embodiment of the above-mentioned speaker of the present invention, the natural fibers include plant fibers, animal fibers or mineral fibers, such as cotton, linen, pulp, wool, silk, asbestos, etc.; the chemical fibers include artificial fibers (also called regenerated fibers), synthetic fibers, inorganic chemical fibers, and also include composite fibers obtained by compounding 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 (Polyimide, PI) fiber, PTFE fiber, polyamide-imide fiber (Polyamide-imide, PAI), aromatic polyamide fiber, polytetrafluoroethylene fiber, polybenzimidazole fiber, polyetheretherketone (PEEK) fiber, polypropylene polyester fiber composited with polypropylene and polyester fiber, polyethylene polyester fiber composited with polyethylene and polyester, polyethylene polypropylene fiber composited with polyethylene and polypropylene, glass fiber, metal fiber and carbon fiber, etc. Preferably, the fiber is a composite fiber, more preferably a composite fiber formed of two materials with different melting points. The composite fiber may be in the form of a sheath-core composition or in other combination forms. For composite fibers in the form of a sheath-core composition, the core layer is generally a high-melting-point fiber and the sheath 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 sheath fiber for crosslinking, and it is also necessary to make the heating temperature significantly lower than the melting point of the core fiber. This ensures both crosslinking and the stability of the fiber morphology, and prevents complete melting and loss of fiber morphology.

[0025] In some embodiments of the present invention, the composite fiber includes but is not limited to PE / PP, PE / PET or PP / PET.

[0026] In some embodiments of the present invention, the acoustic enhancement material may be zeolite molecular sieve raw powder, which only contains zeolite molecular sieve, and its size is generally below 30 μm (preferably 1-10 μm), and can be obtained by conventional industry preparation methods such as hydrothermal synthesis. In some embodiments of the present invention, the acoustic enhancement material is zeolite molecular sieve particles, microspheres, sheets or blocks obtained by molding zeolite molecular sieve raw powder and inorganic / organic adhesive as raw materials. In some embodiments of the present invention, the acoustic enhancement material is zeolite molecular sieve particles, microspheres, sheets or blocks obtained by molding zeolite molecular sieve raw powder, inorganic / organic adhesive and skeleton structure matrix as raw materials. In some embodiments of the present invention, the acoustic enhancement material is zeolite molecular sieve particles, microspheres, sheets or blocks obtained by molding zeolite molecular sieve raw powder and skeleton structure matrix as raw materials. In some embodiments of the present invention, the acoustic enhancement material is a zeolite molecular sieve microsphere, tablet, or block obtained by molding zeolite molecular sieve particles and a framework matrix. In some embodiments of the present invention, the acoustic enhancement material is a zeolite molecular sieve particle containing only zeolite molecular sieve obtained by secondary crystallization of zeolite molecular sieve raw powder.

[0027] On the other hand, the present invention further provides an electronic device, wherein the speaker of the electronic device is the above-mentioned speaker with a rear cavity equipped with a powder leakage-proof breathable barrier.

[0028] In the present invention, the electronic device described above can be any electronic device containing a speaker system. As a specific embodiment of the electronic device described above in the present invention, the electronic device includes a smartphone, TWS earphones, headphones, smart glasses, smart watches, VR devices, AR devices, tablet computers, thin and light laptop computers and other electronic consumer products or speakers. The speakers include home speakers or car speakers.

[0029] Compared with the prior art, the beneficial technical effects achieved by the present invention include:

[0030] The loudspeaker provided by the present invention is equipped with a powder-proof and breathable barrier, which can meet the stringent strength requirements without powder leakage, and can reduce the amount of binder in the acoustic enhancement material within the limited loudspeaker cavity space. On the one hand, it can significantly reduce the impact of the binder on the acoustic performance, and on the other hand, it can further increase the proportion of porous materials such as zeolite molecular sieves in the acoustic enhancement material, further increasing the acoustic compliance of the air in the rear cavity of the loudspeaker, thereby improving the performance of the loudspeaker in the low-frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments. 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 creative work.

[0032] Figure 1 This is a simplified structural diagram of the 1115 type loudspeaker provided in Example 1 of the present utility model.

[0033] Figure 2 This is a simplified structural diagram of the 1115 type speaker provided in Examples 2 to 8 of the present invention.

[0034] Figure 3-Figure 5 This is an SEM image of the breathable barrier film used in Example 1 and Example 2 of the present invention.

[0035] Figure 6-Figure 8 This is a SEM image of the breathable barrier film used in Example 3 of the present invention.

[0036] Figures 9-11 This is a SEM image of the breathable barrier film used in Example 4 of the present invention.

[0037] Description of main figures:

[0038] 1. Shell;

[0039] 2. Speaker unit;

[0040] 3. Speaker module rear cavity;

[0041] 4. Anti-powder leakage breathable barrier;

[0042] 5. Closed space;

[0043] 6. Acoustic enhancement materials. DETAILED DESCRIPTION

[0044] It should be noted that the term "comprise" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method / process, system, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods / processes, products or equipment.

[0045] In this utility model, the terms "upper," "lower," "inner," "outer," "middle," "top," and "bottom" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe the utility model and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0046] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0047] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "disposed," "connected," or "connected" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0048] The "ranges" disclosed in the present invention are given in the form of lower limits and upper limits. 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 boundaries of a particular range. All ranges defined in this manner are combinable, i.e., 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 particular 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.

[0049] In this utility model, unless otherwise specified, the numerical range "ab" is an abbreviation for any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" are listed in this utility model, and "0-5" is merely an abbreviation for these numerical combinations.

[0050] In the present invention, unless otherwise specified, all embodiments and preferred embodiments mentioned in the present invention can be combined with each other to form a new technical solution.

[0051] In the present invention, unless otherwise specified, all technical features and preferred features mentioned in the present invention can be combined with each other to form a new technical solution.

[0052] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. The embodiments described below are some embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. If the specific conditions are not specified in the embodiments, they shall be carried out according to conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used without indicating the manufacturer are all conventional products that can be purchased commercially.

[0053] The acoustic enhancement materials used in the embodiments of the present invention are as follows:

[0054] Original powder form acoustic enhancement material: ZSM-5 type zeolite molecular sieve, spherical, size (diameter) is 10 μm, the molar ratio of silicon to aluminum elements is 300, and the micropore size is 0.5-0.7 nm.

[0055] The first particle form acoustic enhancement material is prepared using the aforementioned original powder form acoustic enhancement material and polyurethane adhesive as raw materials. It is spherical or quasi-spherical, with a size (diameter) of 250-350 μm. The content of polyurethane adhesive accounts for 10% wt of the total weight of the first particle form acoustic enhancement material.

[0056] The second particle form acoustic enhancement material is prepared with the aforementioned original powder form acoustic enhancement material and polyurethane adhesive as raw materials, is spherical or quasi-spherical, and has a size (diameter) of 100-200 μm. The content of polyurethane adhesive accounts for 10% wt of the total weight of the second particle form acoustic enhancement material.

[0057] The third particle form acoustic enhancement material is prepared with the aforementioned original powder form acoustic enhancement material and polyurethane adhesive as raw materials, is spherical or quasi-spherical, has a size (diameter) of 250-350 μm, and the content of polyurethane adhesive accounts for 3% wt of the total weight of the third particle form acoustic enhancement material.

[0058] The fourth particle form acoustic enhancement material is prepared using the aforementioned original powder form acoustic enhancement material and silica sol adhesive as raw materials. It is spherical or quasi-spherical, with a size (diameter) of 250-350 μm. The content of silica sol adhesive accounts for 10% wt of the total weight of the first particle form acoustic enhancement material.

[0059] The fifth particle-shaped acoustic enhancement material is a zeolite molecular sieve particle containing only zeolite molecular sieve obtained by secondary crystallization (180° C.) of the above-mentioned original powder-shaped acoustic enhancement material, and has a particle size of 250-350 μm.

[0060] Lamellar acoustic enhancement material: The aforementioned first particle-shaped acoustic enhancement material and PE / PET composite fiber are used as raw materials, the two are pulped and stirred, and then cast and cured to obtain a material with a size of 0.5 mm × 10 mm × 10 mm.

[0061] Block-shaped acoustic enhancement material: The aforementioned first particle-shaped acoustic enhancement material, polyurethane adhesive and PE / PP composite fiber are used as raw materials. The three are pulped and stirred, and then formed and cured in a mold to obtain a block-shaped acoustic enhancement material with a size of 8mm×10mm×10mm.

[0062] The above selection of acoustic enhancement materials is intended only to illustrate the technical solution and its outstanding technical effects of the present invention and is not intended to limit the scope of protection of the present invention. A person skilled in the art can select the shape, size, core composition, etc. of the acoustic enhancement material as needed to achieve the desired speaker module design.

[0063] Example 1

[0064] This embodiment provides a 1115-type speaker, the structure of which is shown in the following diagram: Figure 1 As shown, it mainly includes a shell 1 and a speaker unit 2. The speaker unit 2 and the shell 1 are combined to form a speaker module rear cavity 3. The volume of the speaker module rear cavity 3 is 1 cubic centimeter (also known as 1cc). The powder leakage-proof breathable barrier 4 is fitted with the inner wall of the speaker module rear cavity 3, forming a relatively closed chamber with the inner wall of the speaker module rear cavity 3, that is, a closed space 5. The closed space 5 is filled with acoustic enhancement material 6.

[0065] The powder-leak-proof breathable barrier 4 is a breathable barrier film, which is directly adhered to the inner wall of the speaker module rear cavity 3 by gluing. When the rear cover of the speaker module rear cavity 3 is not yet closed, the breathable barrier film is first assembled into the rear cavity. Then, glue is applied at the junction of the breathable barrier film and the rear cover. After the rear cover is closed, the adhesive is cured.

[0066] The basic acoustic enhancement material is the block-shaped acoustic enhancement material described above, the breathable barrier membrane is made of PP, has a thickness of 30 μm, a maximum pore size of 50 μm, a porosity of 85%, and a Gurley air permeability of 0.1 s. The SEM image of the breathable barrier membrane is as follows: Figure 3-Figure 5 As shown, from Figure 3-Figure 5 It can be seen from the figure that the pores of the breathable barrier membrane are overlapped and crossed.

[0067] Comparative Example 1

[0068] This comparative example provides an 1115 type speaker, which differs from Example 1 only in that the powder leakage-proof breathable barrier 4 in this comparative example is a mesh cloth, which is a conventional commercial product, model SMESH B10, with a thickness of 105 μm, a pore size of 120 μm, a porosity of 41%, and a Gurley air permeability of 0.3s.

[0069] Example 2

[0070] This embodiment provides a 1115-type speaker, the structure of which is shown in the following diagram: Figure 2 As shown, it mainly includes an outer shell 1 and a speaker unit 2, and the speaker unit 2 is combined with the outer shell 1 to form a speaker module rear cavity 3, and the speaker module rear cavity 3 is equipped with a powder leakage-proof breathable barrier 4, and the volume of the speaker module rear cavity 3 is 1 cubic centimeter (also known as 1cc), wherein the powder leakage-proof breathable barrier 4 includes a breathable barrier membrane and a fixing member, and the fixing member is a frame structure, and the breathable barrier membrane is sleeved on the fixing member to form a powder leakage-proof breathable barrier with a breathable plane, and the powder leakage-proof breathable barrier 4 is clamped on the inner wall of the speaker module rear cavity 3 through the fixing member, and the powder leakage-proof breathable barrier 4 and the inner wall of the speaker module rear cavity 3 form a relatively closed chamber, that is, a closed space 5, and the closed space 5 is filled with acoustic enhancement material 6.

[0071] The base acoustic enhancement material is the first particle-shaped acoustic enhancement material described above, the breathable barrier film is made of PP, has a thickness of 30 μm, a maximum pore size of 50 μm, a porosity of 85%, and a Gurley air permeability of 0.1 s. The SEM image of the breathable barrier film is as follows: Figure 3-Figure 5 As shown, from Figure 3-Figure 5 It can be seen from the figure that the pores of the breathable barrier membrane are overlapped and crossed.

[0072] Example 3

[0073] This embodiment provides a 1115-type speaker, the structure of which is shown in the following diagram: Figure 2As shown, it mainly includes an outer shell 1 and a speaker unit 2, and the speaker unit 2 is combined with the outer shell 1 to form a speaker module rear cavity 3, and the speaker module rear cavity 3 is equipped with a powder leakage-proof breathable barrier 4, and the volume of the speaker module rear cavity 3 is 1 cubic centimeter (also known as 1cc), wherein the powder leakage-proof breathable barrier 4 includes a breathable barrier membrane and a fixing member, and the fixing member is a frame structure, and the breathable barrier membrane is sleeved on the fixing member to form a powder leakage-proof breathable barrier with a breathable plane, and the powder leakage-proof breathable barrier 4 is clamped on the inner wall of the speaker module rear cavity 3 through the fixing member, and the powder leakage-proof breathable barrier 4 and the inner wall of the speaker module rear cavity 3 form a relatively closed chamber, that is, a closed space 5, and the closed space 5 is filled with acoustic enhancement material 6.

[0074] The basic acoustic enhancement material is the above-mentioned original powder form acoustic enhancement material, the breathable barrier membrane is made of PI, has a thickness of 40 μm, a maximum pore size of 30 μm, a porosity of 65%, and a Gurley air permeability of 0.3s. The SEM image of the breathable barrier membrane is as follows: Figure 6-Figure 8 As shown, from Figure 6-Figure 8 It can be seen from the figure that the pores of the breathable barrier membrane are also overlapping and intersecting.

[0075] Example 4

[0076] This embodiment provides a 1115-type speaker, the structure of which is shown in the following diagram: Figure 2 As shown, it mainly includes an outer shell 1 and a speaker unit 2, and the speaker unit 2 is combined with the outer shell 1 to form a speaker module rear cavity 3, and the speaker module rear cavity 3 is equipped with a powder leakage-proof breathable barrier 4, and the volume of the speaker module rear cavity 3 is 1 cubic centimeter (also known as 1cc), wherein the powder leakage-proof breathable barrier 4 includes a breathable barrier membrane and a fixing member, and the fixing member is a frame structure, and the breathable barrier membrane is sleeved on the fixing member to form a powder leakage-proof breathable barrier with a breathable plane, and the powder leakage-proof breathable barrier 4 is clamped on the inner wall of the speaker module rear cavity 3 through the fixing member, and the powder leakage-proof breathable barrier 4 and the inner wall of the speaker module rear cavity 3 form a relatively closed chamber, that is, a closed space 5, and the closed space 5 is filled with acoustic enhancement material 6.

[0077] The basic acoustic enhancement material 20 is a laminated structure formed by a plurality of the above-mentioned sheet-shaped acoustic enhancement materials. The breathable barrier film is made of PET, has a thickness of 45 μm, a maximum pore size of 40 μm, a porosity of 50%, and a Gurley air permeability of 0.4 s. The SEM image of the breathable barrier film is as follows: Figures 9-11 As shown, from Figures 9-11 It can be seen from the figure that the pores of the breathable barrier membrane are also overlapping and intersecting.

[0078] Test Example 1

[0079] This test example uses existing conventional testing methods to test the acoustic performance of the 1115-type speakers provided in Examples 1 to 4 of the present invention and Comparative Example 1.

[0080] This test example also performs a drop structural stability test on the 1115-type speakers provided in Examples 1 to 4 and Comparative Example 1 of the present invention, wherein the drop structural stability test includes drop method 1 and drop method 2 performed consecutively:

[0081] Drop method 1 specifically involves placing the speaker under test into a 250g drop fixture (approximately 160mm x 100mm x 90mm in length, width, and height, made of 316L material, with a flat sample slot cover and no protruding edges). The speaker is then dropped from a height of 10cm 48,000 times (20,000 times on each side, 2000 times on each side). After the drop, the speaker is disassembled and the acoustic enhancement material sample is observed for powder shedding to determine whether the material strength meets the requirements.

[0082] Drop method 2 specifically includes: compared with drop method 1A, the drop height parameter is changed to 160cm, and free drops are performed 600 times (200 times on the front and back, 50 times on each of the four sides); after the drop, the acoustic enhancement material sample is disassembled and the powder shedding is observed to determine whether the material strength meets the requirements.

[0083] Finally, this test example uses existing conventional testing methods to test the acoustic performance of the 1115-type speakers after completing the drop method 1 and drop method 2 tests.

[0084] In this test example, the data involved in the acoustic performance test and the drop structure stability test process and the test data are shown in Table 1 below.

[0085] Table 1

[0086]

[0087] Note: In Table 1, OK means passed the test; NG means failed the test; the degree of powder loss decreases 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 only passed the relatively mild drop test in Method 1 and failed the harsh drop test in Method 2. However, Examples 1-4 of the present invention passed both drop test evaluation methods. This demonstrates that, compared to Comparative Example 1, the use of a powder-proof, breathable barrier (which functions as a breathable barrier membrane) in the rear cavity of the speaker module significantly improves the acoustic enhancement material's strength and powder shedding, enabling it to meet increasingly demanding operating environments, such as those in a speaker rear cavity with a metal mesh. This is because the breathable barrier membrane used in the present examples is softer than traditional mesh fabrics, making the granular acoustic enhancement material less likely to break or shed powder when colliding with the breathable barrier membrane. Furthermore, no powder will fall into the speaker unit, impacting its operation.

[0089] It can also be seen from Table 1 that the acoustic performance of the speakers provided in Examples 1 to 4 of the present invention is better than that of Comparative Example 1, and after the drop structure stability test, the acoustic performance thereof is almost not lost, while the acoustic performance of the speakers provided in Comparative Example 1 is greatly lost after the drop structure stability test, and is significantly worse than the acoustic performance of the speakers provided in Examples 1 to 4 of the present invention.

[0090] Example 5

[0091] This embodiment provides an 1115-type loudspeaker, which differs from Embodiment 2 only in the basic acoustic enhancement material. The basic acoustic enhancement material used in this embodiment is the second particle morphology acoustic enhancement material described above.

[0092] Comparative Example 2

[0093] This comparative example provides a 1115-type loudspeaker, which differs from Example 5 only in that:

[0094] The powder leakage-proof breathable barrier 4 in this comparative example is a mesh cloth, which is a conventional commercial product with the model number SMESH B10. The mesh cloth has a thickness of 105 μm, a pore size of 120 μm, a porosity of 41%, and a Gurley air permeability of 0.3 s.

[0095] Example 6

[0096] This embodiment provides an 1115-type loudspeaker, which differs from Embodiment 2 only in the basic acoustic enhancement material. The basic acoustic enhancement material used in this embodiment is the third particle morphology acoustic enhancement material described above.

[0097] Comparative Example 3

[0098] This comparative example provides a 1115-type loudspeaker, which differs from Example 6 only in that:

[0099] The powder leakage-proof breathable barrier 4 in this comparative example is a mesh cloth, which is a conventional commercial product with the model number SMESH B10. The mesh cloth has a thickness of 105 μm, a pore size of 120 μm, a porosity of 41%, and a Gurley air permeability of 0.3 s.

[0100] Test Example 2

[0101] This test example uses existing conventional testing methods to test the acoustic performance of the 1115-type speakers provided in Examples 5-6 and Comparative Examples 2-3 of the present invention.

[0102] At the same time, this test example also refers to the method in Test Example 1 to perform drop structure stability tests on the 1115-type speakers provided in Examples 5-6 and Comparative Examples 2-3 of the present invention.

[0103] Finally, this test example uses existing conventional testing methods to test the acoustic performance of the 1115-type speakers after completing the drop method 1 and drop method 2 tests.

[0104] In this test example, the data involved in the acoustic performance test and the drop structure stability test process and the test data are shown in Table 2 below.

[0105] Table 2

[0106]

[0107] Note: OK means passed the test; NG means failed the test; the degree of powder loss decreases from no powder loss, slight powder loss, powder loss, to severe powder loss. ΔF01=F0 空 -F01, ΔF02=F0 空 -F02.

[0108] As can be seen from Table 2, after adopting the technical solution of the present invention, after reducing the size of the microspheres or reducing the glue content in the acoustic enhancement material sample, the acoustic enhancement material sample can still show a better effect in the drop test while ensuring the acoustic performance. Specifically, compared with the speaker provided in Comparative Example 3 that cannot pass the relatively mild method 1 drop test, the speaker provided in Example 6 of the present invention can pass both the relatively mild method 1 and the harsh method 2 drop test processes; compared with the speaker provided in Comparative Example 2 that cannot pass the harsh method 2 drop test, the speaker provided in Example 5 of the present invention can also pass the harsh method 2 drop test process. This is because the breathable barrier film used in the embodiments of the present invention is softer than traditional mesh cloth, so the granular form of the acoustic enhancement material is less likely to break or fall into powder when colliding with the breathable barrier film, and no powder will fall into the speaker unit to affect its operation. It can be seen that the speakers provided in Examples 5 and 6 of the present invention can pass the two drop test methods, which shows that the strength and powder loss of the acoustic reinforcement material are greatly improved after the use of the anti-powder leakage breathable barrier, and can meet the increasingly harsh use environment, such as the rear cavity of the speaker with a metal mesh.

[0109] In addition, it can be seen from Table 2 that the acoustic performance of the speakers provided in Examples 5 and 6 of the present invention is almost unchanged after the drop structural stability test, while the acoustic performance of the speakers provided in Comparative Examples 2 and 3 is greatly lost after the drop structural stability test, and is significantly worse than the acoustic performance of the speakers provided in Examples 5 and 6, respectively.

[0110] Example 7

[0111] This embodiment provides an 1115-type loudspeaker, which differs from Embodiment 2 only in the basic acoustic enhancement material. The basic acoustic enhancement material used in this embodiment is the fourth particle morphology acoustic enhancement material described above.

[0112] Comparative Example 4

[0113] This comparative example provides a 1115-type loudspeaker, which differs from Example 7 only in that:

[0114] The powder leakage-proof breathable barrier 4 in this comparative example is a mesh cloth, which is a conventional commercial product with the model number SMESH B10. The mesh cloth has a thickness of 105 μm, a pore size of 120 μm, a porosity of 41%, and a Gurley air permeability of 0.3 s.

[0115] Example 8

[0116] This embodiment provides an 1115-type loudspeaker, which differs from Embodiment 2 only in the basic acoustic enhancement material. The basic acoustic enhancement material used in this embodiment is the fifth particle morphology acoustic enhancement material described above.

[0117] Comparative Example 5

[0118] This comparative example provides a 1115-type loudspeaker, which differs from Example 8 only in that:

[0119] The powder leakage-proof breathable barrier 4 in this comparative example is a mesh cloth, which is a conventional commercial product with the model number SMESH B10. The mesh cloth has a thickness of 105 μm, a pore size of 120 μm, a porosity of 41%, and a Gurley air permeability of 0.3 s.

[0120] Test Example 3

[0121] This test example uses existing conventional testing methods to test the acoustic performance of the 1115-type speakers provided in Examples 7-8 and Comparative Examples 4-5 of the present invention.

[0122] At the same time, this test example also refers to the method in Test Example 1 to perform drop structure stability tests on the 1115-type speakers provided in Examples 7-8 and Comparative Examples 4-5 of the present invention.

[0123] Finally, this test example uses existing conventional testing methods to test the acoustic performance of the 1115-type speakers after completing the drop method 1 and drop method 2 tests.

[0124] In this test example, the data involved in the acoustic performance test and the drop structure stability test process and the test data are shown in Table 3 below.

[0125] Table 3

[0126]

[0127] Note: OK means passed the test; NG means failed the test; the degree of powder loss decreases from no powder loss, slight powder loss, powder loss, to severe powder loss. ΔF01=F0 空 -F01, ΔF02=F0 空 -F02.

[0128] As can be seen from Table 3, compared to the speakers provided in Comparative Examples 4 and 5, Examples 7 and 8, which employ the technical solution of the present invention and equip the rear cavity of the speaker with a powder-leakage-proof breathable barrier, can still achieve superior results in the drop test while ensuring the acoustic performance of the speaker. Compared to the speakers provided in Comparative Examples 4 and 5 (the enclosed spaces of the two are filled with the fourth granular acoustic enhancement material and the fifth granular acoustic enhancement material, respectively), which exhibited severe powder loss during the drop test, the speakers provided in Examples 7 and 8 of the present invention, which utilize a powder-leakage-proof breathable barrier, can pass both ordinary and rigorous drop tests. This is because the breathable barrier film used in the embodiments of the present invention is softer than traditional mesh fabrics. Therefore, the granular acoustic enhancement material is less likely to break or shed powder when colliding with the breathable barrier film, and no powder will fall into the speaker unit, affecting its operation. This not only allows for practical applications of non-polymer binder microspheres or particles, which previously couldn't be used due to powder shedding, but also the presence of the polymer binder clogs the surface of the zeolite molecular sieve, limiting further increases in the density of the particles or microspheres. In the field of electronic consumer products like mobile phones, the limiting factor for speaker cavities is volume, not mass. The technical solutions provided by this utility model enable the development of acoustic enhancement materials with superior acoustic performance and strength.

[0129] In addition, it can be seen from Table 3 that the acoustic performance of the speakers provided in Examples 7 and 8 of the present invention is almost unchanged after the drop structural stability test, while the acoustic performance of the speakers provided in Comparative Examples 4 and 5 is greatly lost after the drop structural stability test, and is significantly worse than the acoustic performance of the speakers provided in Examples 7 and 8, respectively.

[0130] The above description is merely a specific embodiment of the present invention and cannot be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components or equivalent changes and modifications made according to the scope of protection of the present invention should still fall within the scope of this patent.

Claims

1. A speaker with a rear cavity equipped with a powder-proof and breathable barrier, comprising one or more speaker units and one or more housings, wherein the one or more speaker units and the one or more housings are combined to form a speaker module rear cavity, characterized in that: The anti-powder leakage breathable barrier is arranged between the rear cavity of the speaker module and the speaker unit, and a closed space for filling the acoustic enhancement material is formed between the anti-powder leakage breathable barrier and the rear cavity of the speaker module; The powder leakage-proof breathable barrier comprises a breathable barrier membrane, the breathable barrier membrane has a Gurley air permeability of less than 10s, a thickness of less than 80 μm, and a maximum pore size of no more than 50 μm.

2. The loudspeaker according to claim 1, wherein The anti-powder leakage breathable barrier comprises a breathable barrier film and a fixing part, wherein the fixing part is a frame structure, and the breathable barrier film is sleeved on the fixing part to form the anti-powder leakage breathable barrier with a breathable plane.

3. The loudspeaker according to claim 1 or 2, characterized in that The porosity of the breathable barrier film is not less than 50%.

4. The loudspeaker according to claim 1 or 2, characterized in that The material of the breathable barrier film is polypropylene, polyethylene terephthalate or polyimide.

5. The loudspeaker according to claim 1 or 2, characterized in that The breathable barrier film comprises a flat structure and / or a curved structure.

6. The loudspeaker according to claim 1, wherein The shape of the acoustic enhancement material includes one or more combinations of blocks, sheets, microspheres or particles.

7. The loudspeaker according to claim 1, wherein The acoustic enhancement material comprises a porous material.

8. The loudspeaker according to claim 7, characterized in that The porous material includes zeolite molecular sieve, MOF, COF, activated carbon, aerogel or hydrogel.

9. The loudspeaker according to claim 7 or 8, characterized in that The acoustic enhancement material further comprises a skeleton structure matrix, and the skeleton structure matrix comprises fibers, foaming materials or elastic materials.

10. An electronic device, characterized in that: The speaker of the electronic device is the speaker according to any one of claims 1 to 9, the rear cavity of which is equipped with a powder leakage-proof and breathable barrier.

11. The electronic device according to claim 10, characterized in that The electronic devices include smartphones, TWS earphones, headphones, smart glasses, smart watches, VR devices, AR devices, tablets, thin and light laptops or speakers.

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