Sound generating device

Abstract

The present invention discloses a sound generating device, wherein the sound generating device comprises a sound generating unit; a plurality of magnetic sound-absorbing particles; and a housing having a receiving chamber, wherein the sound generating unit is received within the receiving chamber, and the sound generating unit divides the receiving chamber into a front chamber and a rear chamber, and the magnetic sound-absorbing particles are filled within the front chamber and / or the rear chamber, and magnetic attractive force exists between the plurality of magnetic sound-absorbing particles. In the present invention, a virtual enlargement effect of the acoustic rear chamber resonance space of the sound generating device is realized by utilizing magnetic sound-absorbing particles, and as the magnetic sound-absorbing particles attract and adhere to each other, the free flow between particles is restricted, thereby reducing the phenomenon of damage to the magnetic sound-absorbing particles and effectively protecting the acoustic performance of the sound generating device.

Description

Technology Field

[0001] The present invention relates to the field of electroacoustic conversion technology, and in particular to an acoustic generating device. Background Technology

[0002] Acoustic generators are critical acoustic components of portable electronic devices and serve as energy conversion devices to complete the transition between electrical and acoustic signals. To mitigate the degradation of acoustic performance caused by the reduction in the volume of the acoustic generator, acoustic performance is generally improved by filling the rear chamber with sound-absorbing particles to create a virtual expansion effect of the speaker's rear chamber resonance space. However, as the sound-absorbing particles within the rear chamber move with the acoustic generator or the airflow, friction and collision easily occur between the magnetic particles or between the particles and the inner wall of the rear chamber. This damage causes the particles to break and enter the interior of the acoustic generation unit, leading to contamination and consequently degrading acoustic performance.

[0003] Therefore, a new sound generating device must be provided to solve the problem described above.

[0004] The main objective of the present invention is to provide a sound generating device and to solve the problem in which sound-absorbing particles are easily damaged, causing the damaged material of the sound-absorbing particles to enter the interior of the sound generating unit and cause contamination, thereby resulting in a degradation of sound performance.

[0005] To achieve the above-described purpose, the sound generating device devised by the present invention comprises a sound generating unit; a plurality of magnetic sound-absorbing particles; and a housing having a receiving chamber, wherein the sound generating unit is received within the receiving chamber, and the sound generating unit divides the receiving chamber into a front chamber and a rear chamber, and the magnetic sound-absorbing particles are filled within the front chamber and / or the rear chamber, and a magnetic attractive force exists between the plurality of magnetic sound-absorbing particles.

[0006] Preferably, the magnetic sound-absorbing particles comprise a porous matrix and a ferromagnetic material, and the magnetic sound-absorbing particles acquire magnetism through the magnetization of the ferromagnetic material.

[0007] Preferably, the ferromagnetic material within the magnetic sound-absorbing particles is magnetized by magnetizing the magnetic sound-absorbing particles.

[0008] Preferably, the porous matrix comprises at least one of zeolite, activated carbon, porous alumina, porous silica, aluminosilicate hydrate, and metal-organic framework material, and the particle size of the porous matrix is ​​0.1 to 80 μm.

[0009] Preferably, the ferromagnetic material comprises one or more of iron, cobalt, nickel, and lanthanide rare earth metals, and / or one or more of oxides or compounds of iron, cobalt, nickel, and lanthanide rare earth metals, and the particle size of the ferromagnetic material is 0.01 to 80 μm.

[0010] Preferably, the mass percentage of the porous matrix in the magnetic sound-absorbing particles is 50% to 96%, and the mass percentage of the ferromagnetic material is 0.01% to 70%.

[0011] Preferably, the magnetic sound-absorbing particles further comprise an adhesive for bonding the porous matrix and the ferromagnetic material, and the mass percentage of the adhesive is 3% to 10%.

[0012] Preferably, the sound generating device further comprises permeable sound-absorbing particles filled in the rear chamber, wherein a magnetic attractive force exists between the permeable sound-absorbing particles and the magnetic sound-absorbing particles, and a magnetic attractive force exists between the permeable sound-absorbing particles within the magnetic field of the magnetic sound-absorbing particles.

[0013] Preferably, the sound generating device further comprises an isolation mesh installed in the rear chamber to divide the rear chamber into two parts, wherein the sound generating unit and the magnetic sound-absorbing particles are each installed on opposite sides of the isolation mesh, or the isolation mesh surrounds the surface of the sound generating unit and covers at least the ventilation area of ​​the sound generating unit; and the mesh diameter of the isolation mesh is smaller than the particle diameter of the magnetic sound-absorbing particles.

[0014] Preferably, the sound generating device further comprises an isolation net installed in the front chamber to divide the rear chamber into two parts, wherein the sound generating unit and the magnetic sound-absorbing particles are each installed on opposite sides of the isolation net, or the isolation net surrounds the surface of the sound generating unit and covers at least the ventilation area of ​​the sound generating unit;

[0015] The mesh diameter of the above isolation net is smaller than the particle diameter of the above magnetic sound-absorbing particles.

[0016] Preferably, the front chamber is filled with sound-absorbing particles.

[0017] Preferably, the particle size of the magnetic sound-absorbing particles is 100 to 600 μm.

[0018] In the technical solution of the present invention, magnetic sound-absorbing particles equipped with magnetism are filled into the rear chamber, thereby realizing a virtual enlargement effect of the acoustic rear chamber resonance space of the sound generating device using the magnetic sound-absorbing particles; since the magnetic sound-absorbing particles are attracted to each other under the action of magnetic force and restrict the free flow of the particles, friction and collision between the magnetic sound-absorbing particles are prevented or eliminated, thereby eliminating flow noise generated by collision between the magnetic sound-absorbing particles and reducing the phenomenon of damage to the magnetic sound-absorbing particles caused by collision. Therefore, contamination caused by the damaged material of the magnetic sound-absorbing particles entering the interior of the sound generating unit does not occur, effectively protecting the acoustic performance of the sound generating device. Brief explanation of the drawing

[0019] In order to explain in more detail the technical solution means according to the embodiments of the present invention or the prior art, the attached drawings used in the description of the embodiments or prior art below will be briefly described. The following attached drawings are merely some embodiments of the present invention, and it is obvious that those skilled in the art can derive other attached drawings from the structures depicted in these attached drawings without creative labor. FIG. 1 is an exemplary structural diagram of a sound generating device according to an embodiment of the present invention; Figure 2 is a table of reliability test values ​​for magnetic sound-absorbing particles filled in the acoustic generating device of the present invention. Specific details for implementing the invention

[0020] Hereinafter, technical solutions according to embodiments of the present invention will be clearly and completely explained in conjunction with the accompanying drawings according to embodiments of the present invention. It is evident that the described embodiments are only partial embodiments of the present invention and not all embodiments. All other embodiments obtained by a person skilled in the art without creative labor through embodiments according to the present invention fall entirely within the scope of protection of the present invention.

[0021] In embodiments of the present invention, all directional indications (e.g., up, down, left, right, front, back) are intended only to describe the relative positional relationship, movement situation, etc., between each member in a specific posture (as shown in the attached drawings), and if the said specific posture changes, the said directional indications will also change accordingly.

[0022] Furthermore, in the present invention, descriptions related to "first," "second," etc. are for illustrative purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical configurations. Accordingly, configurations limited to "first" or "second" may specify or imply that at least one of the said configurations is included. In the description of the present invention, unless otherwise clearly and specifically limited, "multiple" means at least two, for example, two, three, etc.

[0023] In the present invention, unless otherwise explicitly defined and limited, terms such as "connection" and "fixing" should be understood in a broad sense. For example, unless otherwise explicitly limited, "fixing" may be a fixed connection, a detachable connection, or a structure formed integrally; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium; or it may be a relationship in which the interiors of two elements are in communication or the two elements interact. Those skilled in the art can understand the specific meaning of the aforementioned terms in the present invention according to the specific circumstances.

[0024] Furthermore, while the technical solution means of each embodiment of the present invention may be combined with one another, this must be based on the premise that it can be realized by a person skilled in the art. If the technical solution means are inconsistent with one another or cannot be realized, such combination of technical solution means should be understood as not existing and does not fall within the scope of the claims of the present invention.

[0025] The present invention provides a sound generating device.

[0026] As illustrated in FIG. 1, in one embodiment of the present invention, the sound generating device (100) comprises a sound generating unit (2), a plurality of magnetic sound-absorbing particles (1), and a housing (3) having a receiving chamber, the sound generating unit (2) is received within the receiving chamber, the sound generating unit (2) divides the receiving chamber into a front chamber and a rear chamber, the magnetic sound-absorbing particles (1) are filled within the front chamber and / or rear chamber (32), and magnetic attraction exists between the plurality of magnetic sound-absorbing particles (1).

[0027] In the above-described embodiment, magnetic sound-absorbing particles (1) equipped with magnetism are filled into the front chamber and / or rear chamber (32), thereby realizing a virtual enlargement effect of the acoustic rear chamber resonance space of the sound generating device (100) using the magnetic sound-absorbing particles (1). Since the magnetic sound-absorbing particles (1) are attracted to each other under the action of magnetic force and restrict free flow between the magnetic sound-absorbing particles (1), friction and collision between the magnetic sound-absorbing particles (1) are prevented or eliminated, thereby eliminating flow noise caused by collision between the magnetic sound-absorbing particles (1) and reducing the phenomenon of damage to the magnetic sound-absorbing particles (1) caused by collision between the magnetic sound-absorbing particles (1). Therefore, contamination caused by the damaged material of the magnetic sound-absorbing particles (1) entering the interior of the sound generating unit (2) is avoided, effectively protecting the acoustic performance of the sound generating device (100).

[0028] Here, the magnetic sound-absorbing particles (1) have a spherical or approximately spherical shape and a diameter of 100 to 600 μm. The magnetic sound-absorbing particles (1) may be filled only in the rear chamber (32), only in the front chamber, or both in the rear chamber (32) and the front chamber. When the sound-absorbing particles (1) are filled only in the front chamber, the high-frequency performance of the sound generating device can be controlled; when the sound-absorbing particles (1) are filled only in the rear chamber, the low-frequency performance of the sound generating device can be controlled; and when they are filled in both the front chamber and the rear chamber, the high-frequency and low-frequency performances can be controlled simultaneously. For convenience of explanation, each embodiment will be described below with the example of the magnetic sound-absorbing particles (1) being filled in the rear chamber (32). The diameter of the magnetic sound-absorbing particles (1) is formed to match the volume of the rear chamber (32), and the diameter of the magnetic sound-absorbing particles (1) is 100 to 600 μm, so that assembly molding is easy when manufacturing the magnetic sound-absorbing particles (1) and the requirements for the filling rate of the magnetic sound-absorbing particles (1) in the rear chamber (32) are satisfied.

[0029] In one embodiment, the magnetic sound-absorbing particles (1) comprise a porous matrix and a ferromagnetic material combined together, and as the ferromagnetic material becomes magnetized, the magnetic sound-absorbing particles (1) also acquire magnetism. The ferromagnetic material may be in powder form, and the magnetic sound-absorbing particles (1) are formed by uniformly mixing and combining the powder-form porous matrix and the ferromagnetic material. By utilizing the rapid suction-desorption characteristics of the special physical hole passage structure within the porous material for the gas inside the rear chamber, a virtual enlargement effect of the speaker acoustic rear chamber resonance space is realized. The ferromagnetic material may be a whole material, and it is also natural to form the magnetic sound-absorbing particles (1) by covering the outer surface of the ferromagnetic material with a porous matrix. Since the manufactured magnetic sound-absorbing particles (1) are non-magnetic before magnetization, packaging and filling into the rear chamber (32) are easy; magnetization is performed after the magnetic sound-absorbing particles (1) are filled into the rear chamber (32). The ferromagnetic material is magnetized by magnetization and thus acquires magnetism, thereby causing the magnetic sound-absorbing particles (1) to be attracted to each other under the action of magnetic force. The porous matrix and the ferromagnetic material can be directly bonded by an adhesive to form magnetic sound-absorbing particles (1). In another embodiment, the porous matrix and the ferromagnetic material may be bonded together by applying other processing methods, for example, the porous matrix may cover the outside of the ferromagnetic material or the ferromagnetic material may cover the outside of the porous matrix.

[0030] In the reliability verification experiment, two sound generators were installed and the reliability test was conducted. The two sound generators were operated continuously for 144 hours by passing current through them under conditions of 70°C, a voltage of 3.18V, and a pink noise signal. After the experiment was completed, the resonance frequency F0 of the sound generators was measured, and magnetic sound-absorbing particles were separated to observe whether any damage had occurred. The difference between the two sound generators is that one had magnetic sound-absorbing particles (1) filled in the sound generator that were not magnetized (i.e., no magnetic attraction force existed between the magnetic sound-absorbing particles in the rear chamber), while the other had magnetic sound-absorbing particles (1) filled in the sound generator that were magnetized. Referring to FIG. 2, the resonance frequency of the first sound generator before the reliability test was 787 Hz, and the resonance frequency after the reliability test was completed was 879 Hz. The separated magnetic sound-absorbing particles (1) showed wear and tear, and some damage occurred simultaneously. Before performing the reliability test of the second sound generating device, the resonance frequency was 787 Hz, and after completing the reliability test, the resonance frequency was 800 Hz, and there was no distinct change in the separated magnetic sound-absorbing particles. That is, the present invention fills the rear chamber with magnetic sound-absorbing particles and performs magnetization treatment on the magnetic sound-absorbing particles, thereby magnetizing the magnetic sound-absorbing particles filled in the rear chamber so that they attract each other, effectively restricting the free flow between the magnetic sound-absorbing particles (1), thereby preventing or eliminating friction and collision between the magnetic sound-absorbing particles (1). That is, it eliminates flow noise caused by collision between the sound-absorbing particles and the chamber wall, and flow noise caused by collision between conventional sound-absorbing particles, and reduces the phenomenon of damage to the magnetic sound-absorbing particles (1) due to collision between the magnetic sound-absorbing particles (1), while also effectively maintaining the acoustic performance of the sound generating device (100), such as showing a small change in resonance frequency before and after performing the reliability test.

[0031] In addition, the magnetic sound-absorbing particles (1) further include an adhesive for bonding a porous matrix in powder form and a ferromagnetic material. Since the porous matrix and the ferromagnetic material are bonded to each other by the adhesive, the adhesive provides appropriate viscosity so that the magnetic sound-absorbing particles (1) can be easily molded, which is advantageous for improving the mechanical strength of the raw material after molding, and prevents the ferromagnetic material and the porous matrix from separating, thereby ensuring the magnetic durability of the magnetic sound-absorbing particles (1). The adhesive may be one or more types of polyacrylate-based, polyurethane-based, or polyvinyl acetate-based adhesives. The mass percentage of the adhesive is 3% to 10%, and since an excessive amount of adhesive during the manufacturing process causes the pores of the porous matrix to become clogged, appropriately controlling the amount of adhesive used under the premise that adhesion between the porous matrix and the ferromagnetic material is secured is advantageous for controlling the size and number of pores of the magnetic sound-absorbing particles (1).

[0032] The porous matrix comprises at least one of zeolite, activated carbon, porous alumina, porous silica, aluminosilicate hydrate, and metal-organic framework materials, and the particle size of the porous matrix is ​​0.1 to 80 μm. The metal-organic framework material is a porous material having a repeating network structure formed of metal ions and organic small molecule ligands, wherein the metal-organic framework material is provided with micropores and mesopores, the pore size range of the micropores is 0.3 to 0.8 nm, and the pore size range of the mesopores is 2 to 40 nm. Here, the metal ions include ions of at least one element selected from copper, iron, zinc, manganese, indium, cadmium, and cobalt; and the small molecule ligands include at least one of formic acid, malonic acid, tartaric acid, or citric acid.

[0033] The ferromagnetic material comprises one or more of iron, cobalt, nickel, and lanthanide rare earth metals, and / or one or more of oxides of iron, cobalt, nickel, and lanthanide rare earth metals, and the particle size of the ferromagnetic material is 0.01 to 80 μm. The ferromagnetic material manufactured from the above-described material possesses magnetism under the action of an external magnetic field, and the generated magnetic field has stable strength and is not easily de-energized. Specifically, the ferromagnetic material may be iron powder, nickel powder, cobalt powder, triiron tetroxide powder, ferrite powder, aluminum-cobalt-nickel alloy powder, neodymium-iron-boron powder, iron-chromium-cobalt alloy powder, samarium-cobalt alloy powder, etc.

[0034] The mass percentage of the porous matrix within the magnetic sound-absorbing particle (1) is 50% to 96%, the mass percentage of the ferromagnetic material is 0.1% to 70%, and the mass percentage of the adhesive is 3% to 10%. In one embodiment, the mass percentage of the porous matrix within the magnetic sound-absorbing particle (1) is 72%, the mass percentage of the ferromagnetic material is 20%, and the mass percentage of the adhesive is 8%. By balancing the mass percentage of the porous matrix and the mass percentage of the ferromagnetic material within the magnetic sound-absorbing particle (1), the sound-absorbing performance of the magnetic sound-absorbing particle (1) is secured, the magnetic field strength after magnetization of the magnetic sound-absorbing particle (1) is controlled, and the porous matrix and the ferromagnetic material are ensured to adhere firmly.

[0035] In one embodiment, the mass percentage of the porous matrix within the magnetic sound-absorbing particle (1) is 50%, the mass percentage of the ferromagnetic material is 40%, and the mass percentage of the adhesive is 10%. By including as much mass percentage of the ferromagnetic material as possible, the magnetic field strength formed by magnetizing a single magnetic sound-absorbing particle (1) is enhanced, thereby causing two adjacent magnetic sound-absorbing particles (1) to be closely bonded.

[0036] In one embodiment, the mass percentage of the porous matrix within the magnetic sound-absorbing particle (1) is 94%, the mass percentage of the ferromagnetic material is 1%, and the mass percentage of the adhesive is 5%. When the volume of the rear chamber (32) is relatively small, increasing the mass percentage of the porous matrix can enhance the virtual enlargement effect of the acoustic rear chamber resonance space of the sound generating device (100), thereby effectively lowering the speaker resonance frequency.

[0037] Additionally, the sound generating device (100) further includes permeable sound-absorbing particles filled in the rear chamber (32), and magnetic attraction exists between the permeable sound-absorbing particles and the magnetic sound-absorbing particles (1), and magnetic attraction exists between the permeable sound-absorbing particles within the magnetic field formed by the magnetic sound-absorbing particles (1). Both the magnetic sound-absorbing particles (1) and the permeable sound-absorbing particles are sound-absorbing particles that act to increase the resonance space of the rear chamber, and permeable metal powder or permeable metal oxide powder is mixed in the permeable sound-absorbing particles. Thus, the permeable sound-absorbing particles are attracted to the magnetic sound-absorbing particles (1) or are attracted to each other in the magnetic field formed by the magnetic sound-absorbing particles (1), thereby restricting the free flow between the sound-absorbing particles and preventing or eliminating friction and collision between the sound-absorbing particles, thereby eliminating flow noise caused by collision between sound-absorbing particles and reducing the phenomenon of sound-absorbing particles being damaged by collision between magnetic sound-absorbing particles. Therefore, the occurrence of contamination caused by damaged sound-absorbing particles entering the sound generating unit is avoided, thereby effectively protecting the acoustic performance of the sound generating device (100).

[0038] Here, the sound generating device (100) further includes an isolation mesh (4) installed in the rear chamber (32) to divide the rear chamber (32) into two parts, and the sound generating unit (2) and the magnetic sound-absorbing particles (1) are each installed on both sides of the isolation mesh (4); the isolation mesh (4) surrounds the surface of the sound generating unit (2) and covers at least the ventilation area of ​​the sound generating unit (2); and the mesh diameter of the isolation mesh (4) is formed to be smaller than the particle diameter of the magnetic sound-absorbing particles (1). By installing a separating net (4) to isolate the magnetic sound-absorbing particles and the sound generating unit, the gas can enter the rear chamber (32) through the separating net (4), but the magnetic sound-absorbing particles (1) are blocked from entering the rear chamber (32) by the separating net (4), thereby preventing the magnetic sound-absorbing particles (1) from entering the chamber where the sound generating unit (2) is located and affecting the sound generating unit (2). By appropriately setting the size of the holes in the separating net (4), the entry of partially damaged magnetic sound-absorbing particles (1) into the chamber where the sound generating unit (2) is located is further restricted, thereby further ensuring the overall acoustic performance of the sound generating device (100).

[0039] The housing (3) is provided with a leak hole that communicates the rear chamber (32) with the outside. The leak hole communicates the rear chamber (32) with the outside of the housing (3) and serves to equalize the air pressure inside the rear chamber (32).

[0040] When manufacturing magnetic sound-absorbing particles (1), a porous material, a ferromagnetic material, and an adhesive are mixed in a predetermined ratio to form a wet material; the mixture is manufactured into a plurality of particle bases of uniform size, and the particle bases are dried to obtain magnetic sound-absorbing particles (1).

[0041] Here, a mixture can be formed by first uniformly dispersing a porous material and a ferromagnetic material in water according to a fixed ratio; and a wetting material can be formed by adding an adhesive to the mixture according to a predetermined ratio and stirring uniformly. Here, it is naturally possible to replace the water with another solvent. Mixing the porous material and the ferromagnetic material first is advantageous for uniform mixing of the porous material and the ferromagnetic material. Alternatively, the porous material and the ferromagnetic material can be directly added to an aqueous adhesive solution and mixed and stirred to form a wetting material.

[0042] After forming a raw particle body using methods such as agglomeration, extrusion, or spray agglomeration, the raw particle body with a particle size of 100 to 600 μm can be filtered and dried to obtain magnetic sound-absorbing particles (1). Alternatively, a mixture can be filled and molded into a mold to form a raw particle body with a particle size of 100 to 600 μm, and the obtained raw particle body can be dried to obtain magnetic sound-absorbing particles (1).

[0043] In one embodiment, a dry zeolite material and a triiron tetroxide material were added to water, which is a solvent, in fixed proportions and mechanically stirred at 500 rpm for 1.5 h to obtain a uniformly dispersed mixed suspension; a polyacrylate adhesive was added to the mixture and mechanically stirred at 500 rpm for 0.5 h to form a wetting agent. Here, the added mass of the zeolite is 27% of the total mass of the slurry described above, the added mass of the triiron tetroxide material is 2.8% of the total mass of the slurry described above, and the added mass of the polyurethane is 0.2% of the total mass of the mixed suspension described above. The solid mass in the slurry is 30% of the total mass of the mixed suspension described above.

[0044] A uniformly dispersed wet material was fed into a spray drying granulator, and drying granulation was performed by setting the inlet temperature of the spray drying granulator to 140 to 160 ℃, the outlet temperature to 100 to 110 ℃, and the spray pressure to 0.5 MPa to obtain initial molded particles.

[0045] The above-described initial molded particles were heated, cured, and dried in a burner at 120°C for 0.5 h to obtain dried particles. The above-described dried particles were sieved to obtain magnetic sound-absorbing particles (1) with a particle size of approximately 100 to 600 μm.

[0046] The manufactured magnetic sound-absorbing particles (1) were injected into the rear chamber (32) of the sound generating device (100) to be manufactured, and the magnetic sound-absorbing particles (1) injected into the rear chamber (32) were magnetized to manufacture the sound generating device (100) as described above.

[0047] When manufacturing magnetic sound-absorbing particles (1), by mixing a ferromagnetic material, the manufactured magnetic sound-absorbing particles (1) become magnetized and acquire magnetism. The magnetic sound-absorbing particles (1) equipped with magnetism are filled into the rear chamber (32) of the sound generating device (100) manufactured in this way. The magnetic sound-absorbing particles (1) can be attracted to each other under the action of magnetic force, and thus free flow between particles is restricted, thereby preventing or eliminating friction and collision between magnetic sound-absorbing particles (1), thereby eliminating flow noise caused by collision between magnetic sound-absorbing particles (1) and reducing the phenomenon of magnetic sound-absorbing particles (1) being damaged by collision between magnetic sound-absorbing particles (1). Therefore, contamination caused by damaged materials of magnetic sound-absorbing particles (1) entering the sound generating unit (2) is avoided, and the acoustic performance of the sound generating device (100) is effectively protected.

[0048] The description is merely a desirable embodiment of the present invention and does not limit the scope of the patent of the present invention. Any equivalent structural transformation implemented using the contents of the specification and the attached drawings based on the inventive concept of the present invention, or any direct or indirect application to other technical fields, falls within the scope of patent protection of the present invention. Explanation of the symbols

[0049] 100: Sound generating device 1: Magnetic sound-absorbing particles 2: Sound generating unit 3: Housing 32: Rear chamber 4: Isolation Network The implementation, functional features, and advantages of the purpose of the present invention will be further explained with reference to the accompanying drawings and examples.

Claims

Claim 1 A sound generating device comprising: a sound generating unit; a plurality of magnetic sound-absorbing particles; and a housing having a receiving chamber, wherein the sound generating unit is received within the receiving chamber, the sound generating unit divides the receiving chamber into a front chamber and a rear chamber, the magnetic sound-absorbing particles are filled within the front chamber and / or rear chamber, and magnetic attractive force exists between the plurality of magnetic sound-absorbing particles, wherein the magnetic sound-absorbing particles comprise a porous matrix and a ferromagnetic material, and the magnetic sound-absorbing particles acquire magnetism by magnetization of the ferromagnetic material, wherein the magnetic sound-absorbing particles are non-magnetic before magnetization, and the ferromagnetic material within the magnetic sound-absorbing particles becomes magnetized by magnetization treatment after being filled within the front chamber and / or rear chamber, and the magnetic sound-absorbing particles further comprise an adhesive for bonding the porous matrix and the ferromagnetic material, and wherein the particle size of the ferromagnetic material is 0.01 to 80 μm. Claim 2 delete Claim 3 delete Claim 4 An acoustic generating device according to claim 1, wherein the porous matrix comprises at least one of zeolite, activated carbon, porous alumina, porous silica, aluminosilicate hydrate, and metal-organic framework material, and the particle size of the porous matrix is ​​0.1 to 80 μm. Claim 5 An acoustic generating device according to claim 1, characterized in that the ferromagnetic material comprises one or more of iron, cobalt, nickel, and lanthanide rare earth metals, and / or one or more of oxides or compounds of iron, cobalt, nickel, and lanthanide rare earth metals. Claim 6 An acoustic generating device according to claim 1, characterized in that, among the magnetic sound-absorbing particles, the mass percentage of the porous matrix is ​​50% to 96% and the mass percentage of the ferromagnetic material is 0.01% to 70%. Claim 7 An acoustic generating device according to claim 1, characterized in that the mass percentage of the adhesive is 3% to 10%. Claim 8 A sound generating device according to any one of claims 1 and 4 to 7, wherein the sound generating device further comprises permeable sound-absorbing particles filled in the rear chamber, wherein a magnetic attractive force exists between the permeable sound-absorbing particles and the magnetic sound-absorbing particles, and a magnetic attractive force exists between the permeable sound-absorbing particles within the magnetic field of the magnetic sound-absorbing particles. Claim 9 A sound generating device according to any one of claims 1 and 4 to 7, wherein the sound generating device further comprises an isolation mesh installed in the rear chamber to divide the rear chamber into two parts, wherein the sound generating unit and the magnetic sound-absorbing particles are each installed on both sides of the isolation mesh, or the isolation mesh surrounds the surface of the sound generating unit and covers at least the ventilation area of ​​the sound generating unit; and wherein the mesh diameter of the isolation mesh is smaller than the particle diameter of the magnetic sound-absorbing particles. Claim 10 An acoustic generating device according to any one of claims 1 and 4 to 7, characterized in that the front chamber is filled with sound-absorbing particles. Claim 11 An acoustic generating device characterized in that, in any one of claims 1 and 4 to 7, the particle size of the magnetic sound-absorbing particles is 100 to 600 μm.

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