An expandable acoustic reinforcement component and its manufacturing method and application

Abstract

The present invention provides an expandable acoustic enhancement part and a manufacturing method and application thereof, wherein when one or more expansion triggering conditions are applied, the apparent volume of the expandable acoustic enhancement part increases and the internal pore volume increases. The expandable acoustic enhancement part is applied to a loudspeaker, and an expansion triggering treatment is performed on the expandable acoustic enhancement part to increase its apparent volume and increase its internal pore volume, thereby improving the acoustic performance of the loudspeaker equipped with the expandable acoustic enhancement part, and at the same time, extrusion is formed between the expandable acoustic enhancement part and between the expandable acoustic enhancement part and the cavity wall of the specific space of the loudspeaker, thereby fixing the expandable acoustic enhancement part, achieving the effect of eliminating noise during the use of the loudspeaker and preventing the acoustic enhancement part from colliding, breaking and shedding powder, thereby improving the service life of the acoustic enhancement part.

Description

Technical Field

[0001] The invention relates to an expandable acoustic reinforcement component and a manufacturing method and application thereof, belonging to the technical field of electroacoustic products. Background Art

[0002] European patent EP2424270 discloses a technology that uses zeolite materials to virtually enlarge the back cavity of a speaker. By arranging acoustic enhancement materials with gas adsorption and desorption capabilities such as zeolite and activated carbon in the speaker cavity, the performance of the speaker can be achieved as if the cavity volume was expanded to several times the original value without changing the cavity volume.

[0003] In recent years, this technology has been widely used in speakers of smartphones, tablets, thin and light laptops and other devices, enabling them to achieve better sound performance in limited space.

[0004] At present, acoustic enhancement materials are mostly in the form of granular microspheres with a diameter of 100-600 microns. Applying the granular microspheres to the back cavity of micro speakers can reduce the lowest resonance frequency, enhance low-frequency sensitivity, and improve the low-frequency performance of the speaker. However, during the application of granular acoustic enhancement materials, problems such as particle breakage, powder shedding, and collision noise have been reported. This problem is particularly obvious in low-temperature environments. The causes of this type of problem include:

[0005] The shape of the acoustic enhancement material particles and the limitations of the filling technology. Specifically, it is difficult for the acoustic enhancement material particles to be 100% filled in the speaker cavity space, that is, there will be empty space for the acoustic enhancement material particles in the cavity to move freely; in addition, when the speaker is working, the diaphragm pushes the airflow, and the airflow pushes the acoustic enhancement material particles, causing the acoustic enhancement material particles to vibrate, resulting in collisions between the acoustic enhancement material particles and between the acoustic enhancement material particles and the speaker casing, thereby causing the above situation to occur.

[0006] In addition, due to the current increase in consumer demand for the sound performance of electronic devices, speaker design requires a lower F0 value and tends to improve sound performance by increasing the amplitude. However, its negative effects include an increase in the operating temperature of the speaker, and the existing acoustic enhancement material particles usually have low thermal conductivity, which is not conducive to the heat dissipation of the speaker.

[0007] In this regard, Chinese patent CN111163392A achieves the purpose of fixing the acoustic enhancement material particles by simply mixing expandable microspheres with acoustic enhancement material particles and then loading them into a speaker. However, this technical solution has the following disadvantages: the prior art only simply mixes the acoustic enhancement material particles with the expandable microsphere material. In actual mass production applications, after the filling is completed, it is often easy for the ratio of expandable microsphere material to acoustic enhancement material particles filled in a single micro speaker to be inconsistent with the target ratio during mass mixing, resulting in poor uniformity of acoustic performance of the same batch of speakers, and unable to truly achieve reliable mass industrial production. Chinese patent CN111534017A makes improvements on the above scheme, bonding the expandable material pieces to the acoustic adjustment material particles one by one to achieve the purpose of collision buffering of the acoustic adjustment material particles. However, this technical solution still has the following disadvantages: in order to achieve effective collision cushioning, the volume of acoustic regulating material that can be filled in the same fillable space is significantly reduced, and in order to achieve effective bonding, the acoustic regulating material particles need to lose a certain amount of surface area, which reduces the number of channels through which air can enter the acoustic regulating material particles. The above two points both reduce the acoustic performance of speakers equipped with this component compared to speakers equipped with traditional acoustic regulating materials; and the size of traditional acoustic regulating material particles is at the micron level, and this technical solution also cannot achieve reliable large-scale industrial production.

[0008] Therefore, providing a new type of expandable acoustic reinforcement component and its manufacturing method and application has become a technical problem that urgently needs to be solved in the field. Summary of the invention

[0009] In order to solve the above-mentioned shortcomings and deficiencies, an object of the present invention is to provide an expandable acoustic reinforcement.

[0010] Another object of the present invention is to provide a method for manufacturing the above-mentioned expandable acoustic reinforcement.

[0011] Yet another object of the present invention is to provide a loudspeaker comprising the above-mentioned inflatable acoustic reinforcement.

[0012] Another object of the present invention is to provide a method for assembling the above-mentioned inflatable acoustic reinforcement.

[0013] The last object of the present invention is to provide an electronic device, wherein the above-mentioned inflatable acoustic reinforcement member is installed in the speaker rear cavity of the electronic device.

[0014] To achieve the above objectives, in one aspect, the present invention provides an expandable acoustic reinforcement, wherein when one or more expansion-triggered conditions are applied, the apparent volume of the expandable acoustic reinforcement increases and the internal pore volume increases.

[0015] As a specific embodiment of the expandable acoustic enhancement component described above in the present invention, the expandable acoustic enhancement component includes one or a combination of expandable acoustic enhancement particles, expandable acoustic enhancement sheets and expandable acoustic enhancement coatings.

[0016] As a specific embodiment of the expandable acoustic reinforcement member described above in the present invention, the interior and exterior of the expandable acoustic reinforcement member have uniform properties and are not layered.

[0017] As a specific embodiment of the above-mentioned inflatable acoustic reinforcement of the present invention, after applying the one or more expansion triggering conditions, the apparent volume of the inflatable acoustic reinforcement is 100-150% of its apparent volume before the expansion triggering conditions are applied.

[0018] As a specific embodiment of the expandable acoustic reinforcement component described above in the present invention, the expansion triggering conditions include one or a combination of mechanical force, temperature, humidity, sound waves, light, electric current, magnetic field force, chemical atmosphere and air pressure.

[0019] As a specific embodiment of the expandable acoustic enhancement component described above in the present invention, in the initial state, the diameter of the expandable acoustic enhancement particles is between 50-900 μm, and the thickness of the expandable acoustic enhancement sheet is between 50-900 μm.

[0020] As a specific embodiment of the expandable acoustic enhancement member described above in the present invention, the expandable acoustic enhancement member is prepared by mixing the raw materials used to prepare the expandable acoustic enhancement member with a solvent to obtain an expandable acoustic enhancement slurry, and then molding the slurry;

[0021] Wherein, the raw materials include gas adsorption material, binder and expandable material, and based on the total weight of the gas adsorption material as 100%, the amount of the expandable material is 0.1-10%, and the amount of the binder is 1-10%;

[0022] Or the raw materials include a gas adsorbent and an expandable binder, and the amount of the expandable binder is 0.5-10% based on the total weight of the gas adsorbent as 100%;

[0023] The amounts of the binder and expandable binder used are calculated based on the amounts of the solid components in the binder and expandable binder.

[0024] As a specific embodiment of the above-mentioned expandable acoustic reinforcement component of the present invention, the raw materials further include gas adsorption material, adhesive and expandable adhesive.

[0025] As a specific embodiment of the expandable acoustic enhancement component described above in the present invention, the gas adsorption material includes one or a combination of molecular sieves, activated carbon, porous metal oxides and porous metal organic frameworks.

[0026] As a specific embodiment of the expandable acoustic reinforcement member described above in the present invention, the molecular sieve may be, for example, zeolite molecular sieve powder.

[0027] As a specific embodiment of the expandable acoustic reinforcement member described above in the present invention, the adhesive includes one or a combination of polyacrylate suspension, polystyrene acetate suspension, polyvinyl acetate suspension, polystyrene acrylate suspension and polybutadiene rubber suspension.

[0028] As a specific embodiment of the expandable acoustic reinforcement member described above in the present invention, the expandable material includes one or a combination of expandable microspheres, expandable graphite, and foaming materials.

[0029] As a specific embodiment of the above-mentioned expandable acoustic reinforcement member of the present invention, the foaming material includes but is not limited to a combination of one or more of foaming rubber, foaming plastic, etc.

[0030] As a specific embodiment of the expandable acoustic reinforcement member described above in the present invention, the expandable microspheres include one or a combination of acrylic, polyurethane, polystyrene, polyethylene, and melamine microspheres.

[0031] As a specific embodiment of the expandable acoustic reinforcement member described above in the present invention, the diameter of the expandable microspheres is between 0.1-40 μm.

[0032] As a specific embodiment of the expandable acoustic reinforcement member described above in the present invention, the expandable adhesive includes one or a combination of polyurethane and phenolic resin adhesives.

[0033] In the present invention, the "expandable" refers to the property that the material can increase its apparent volume when a trigger condition is applied, such as heating, wherein the "expandable" includes expansion that only undergoes physical changes and foaming that undergoes chemical changes (i.e., "expandable").

[0034] On the other hand, the present invention also provides a method for manufacturing the above-mentioned expandable acoustic reinforcement member, wherein the manufacturing method comprises:

[0035] Fully mixing the raw materials for preparing the expandable acoustic enhancement member with a solvent to obtain an expandable acoustic enhancement slurry;

[0036] The expandable acoustic enhancement slurry is then molded to obtain the expandable acoustic enhancement component.

[0037] On the other hand, the present invention also provides a speaker including the inflatable acoustic reinforcement member described above, the speaker comprising one or more acoustic sensors, one or more housings, and one or more inflatable acoustic reinforcement members, the one or more acoustic sensors are combined with the one or more housings to form the speaker back cavity, and the one or more inflatable acoustic reinforcement members are confined in the speaker back cavity.

[0038] On the other hand, the present invention also provides an assembly method for the inflatable acoustic enhancement components described above, wherein the one or more inflatable acoustic enhancement components are assembled in a specific container to reach an initial assembly state, and one or more expansion triggering conditions are applied so that the apparent volume of the one or more inflatable acoustic enhancement components reaches a target value, and the one or more inflatable acoustic enhancement components reach an assembly completion state.

[0039] As a specific embodiment of the method for assembling the expandable acoustic reinforcement member described above according to the present invention, the specific container is a speaker back cavity.

[0040] As a specific embodiment of the method for assembling the above-mentioned inflatable acoustic reinforcement of the present invention, the specific container is a package for wrapping the inflatable acoustic reinforcement.

[0041] As a specific embodiment of the assembly method of the inflatable acoustic reinforcement member described above, the target apparent volume of the inflatable acoustic reinforcement member is 100-150% of its apparent volume before the expansion trigger condition is applied.

[0042] Among them, any one of the expandable acoustic enhancement particles, expandable acoustic enhancement sheets and any two or three of the expandable acoustic enhancement particles, expandable acoustic enhancement sheets and expandable acoustic enhancement coatings are filled and / or assembled into the back cavity of the speaker. After being triggered by expansion, these expandable acoustic enhancement parts expand, and after the apparent volume increases, they just fill the specific space in the back cavity of the speaker of the electronic device.

[0043] Finally, the present invention also provides an electronic device, wherein the above-mentioned expandable acoustic reinforcement member is installed in the rear cavity of the speaker of the electronic device.

[0044] As a specific embodiment of the electronic device described above in the present invention, the electronic device includes but is not limited to smart phones, TWS earphones, headphones, smart glasses, smart watches, tablet computers or thin and light laptops, etc.

[0045] In the present invention, the expandable acoustic reinforcement component is applied to a loudspeaker, and an expansion triggering treatment is performed on the expandable acoustic reinforcement component to increase the apparent volume of the expandable acoustic reinforcement component and increase the internal pore volume, thereby improving the acoustic performance of the loudspeaker equipped with the expandable acoustic reinforcement component. At the same time, extrusion is formed between the expandable acoustic reinforcement components and between the expandable acoustic reinforcement components and the cavity wall of the specific space of the loudspeaker, thereby fixing the expandable acoustic reinforcement component, thereby eliminating noise during the use of the loudspeaker and preventing the acoustic reinforcement component from colliding, breaking and shedding powder, thereby improving the service life of the acoustic reinforcement component.

[0046] Secondly, compared with conventional acoustic enhancement materials, after the expandable acoustic enhancement component provided by the present invention is assembled (i.e., after the apparent volume increases), the pore size value of the pores contained therein also increases accordingly, and the pore volume in the overall structure of the expandable acoustic enhancement component increases, thereby improving the overall performance of the expandable acoustic enhancement component, and the F0 value of the speaker equipped with the expandable acoustic enhancement component is reduced more significantly.

[0047] Again, in a specific space of the speaker back cavity with a fixed volume (such as Figure 1 In the cavity 150), after the expandable acoustic reinforcement component expands and its apparent volume increases, the contact area between the expandable acoustic reinforcement components becomes larger and the contact becomes closer due to the extrusion between the expandable acoustic reinforcement components, so that heat can be efficiently conducted between the expandable acoustic reinforcement component and the speaker cavity wall, thereby fully improving the heat dissipation efficiency inside the speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 The figure is a schematic diagram of the structure of a loudspeaker.

[0050] Figure 2a and Figure 2b Schematic diagram of a cross-section of a cavity filled with expandable acoustic enhancement particles.

[0051] Figure 3a and Figure 3b Schematic diagram of a cross section of a cavity filled with an expandable acoustic enhancement sheet.

[0052] Figure 4a and Figure 4b Schematic diagram of a cross-section of a cavity equipped with an expandable acoustic enhancement coating.

[0053] Figure 5 Schematic diagram of the preparation process of expandable acoustic materials.

[0054] Figure 6 This is a scanning electron micrograph of the cross section of the expandable acoustic enhancement particles prepared in Example 1 of the present invention.

[0055] Figure 7 The figure is a test result diagram obtained by performing high temperature and high humidity power-on reliability tests on the loudspeakers prepared in the corresponding use cases 1-2 and comparative application examples 1-2 in the test example 2 of the present invention. DETAILED DESCRIPTION

[0056] "Range" disclosed herein is given in the form of lower limit and upper limit. It 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, i.e. any lower limit can be combined with any upper limit to form a range. For example, for a particular parameter, a range of 60-120 and 80-110 is listed, and it is understood that a range of 60-110 and 80-120 is 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 can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5.

[0057] In the present invention, unless otherwise specified, the numerical range "ab" represents an abbreviation of any real number combination between a and b, where a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been listed in this document, and "0-5" is just an abbreviation of these numerical combinations.

[0058] In the present invention, unless otherwise specified, all embodiments and preferred embodiments mentioned herein can be combined with each other to form a new technical solution.

[0059] In the present invention, unless otherwise specified, all technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

[0060] In the present invention, unless otherwise specified, the term "including" mentioned herein may be open-ended or closed-ended. For example, the term "including" may mean that other materials and / or elements not listed may also be included, or may only include the listed materials and / or elements.

[0061] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical scheme of the present invention is now described in detail in conjunction with the following specific embodiments, but it should not be understood as limiting the applicable scope of the present invention.

[0062] Figure 1 It is a structural schematic diagram of a speaker. In some embodiments, the speaker 100 includes an acoustic sensor 110, an upper speaker housing 120, and a lower speaker housing 130. The acoustic sensor 110 is used to realize the conversion of electrical energy and acoustic energy. The acoustic sensor 110 is fixedly connected to the opening of the upper speaker housing 120, so that the sound propagation between the acoustic sensor 110 and the external space can be realized, and the connection method includes but is not limited to bonding, fastener connection, plug-in and the like. The upper speaker housing 120 includes an opening, and the upper speaker housing 120 is fixedly connected to the lower speaker housing 130, and the connection method includes but is not limited to bonding, fastener connection, plug-in and the like. The acoustic sensor 110, the upper speaker housing 120 and the lower speaker housing 130 together form the back cavity of the speaker 100.

[0063] In some embodiments, the speaker 100 further includes an acoustically transparent component 140. The acoustically transparent component 140 has low acoustic impedance and does not affect the gas flow in the rear cavity. In some embodiments, the acoustically transparent component 140 may be a combination of one or more of a cloth mesh, a metal mesh, a plastic mesh, etc. The acoustically transparent component 140 is assembled in the rear cavity of the speaker 100. In some embodiments, the acoustically transparent component 140 is fixedly connected to the upper speaker housing 120 and the lower speaker housing 130, respectively, and forms a cavity 150. In some embodiments, the acoustically transparent component 140 may be fixedly connected only to the upper speaker housing 120 or the lower speaker housing 130, and forms a cavity 150. In some embodiments, the acoustically transparent component 140 may be a three-dimensional structure, directly forming the cavity 150. The acoustically transparent component 140 allows gas flow between the cavity 150 and the rest of the rear cavity of the speaker 100. In some embodiments, the cavity 150 may be filled with an expandable acoustic enhancement piece. The expandable acoustic enhancement piece reduces the F0 value of the speaker 100 by adsorbing gas, and the bass performance is better. In some embodiments, the expandable acoustic enhancement member can be a combination of expandable acoustic enhancement particles, expandable acoustic enhancement sheets, expandable acoustic enhancement coatings, etc. When the speaker 100 is in normal speaker operating conditions, the acoustically transparent component 140 can confine the expandable acoustic enhancement member in the cavity 150.

[0064] Figure 2a and Figure 2b Schematic diagram of a cross-section of a cavity filled with expandable acoustic enhancement particles. Figure 2a An initial state of filling the cavity 150 with expandable acoustic enhancement particles 210 is shown. Figure 2b The state where the expandable acoustic enhancement particles 210 are filled in the cavity 150 is shown.

[0065] In some embodiments, at least one side wall of the cavity 150 is a porous structure that allows gas to flow between the cavity 150 and the rest of the rear cavity of the speaker 100. In some embodiments, the cavity 150 is filled with a plurality of expandable acoustic enhancement particles 210. The expandable acoustic enhancement particles 210 are porous structures with adsorption properties that can easily adsorb and desorb gas molecules. The filling amount of the expandable acoustic enhancement particles 210 in the cavity 150 is 65%-95%. After the expandable acoustic enhancement particles 210 are filled into the cavity 150, the cavity 150 filled with the expandable acoustic enhancement particles 210 is subjected to one or more expansion triggering conditions. The particle diameter of the expandable acoustic enhancement particles 210 in the initial state of filling is 50-900 μm, and the particle diameter can be selected according to the application scenario and requirements. The expansion triggering conditions include, but are not limited to, one or more combinations of mechanical force, temperature, humidity, sound waves, light, current, magnetic field force, chemical atmosphere, air pressure, etc. In some embodiments, when one or more expansion trigger conditions are applied, the apparent volume of the expandable acoustic enhancement particle 210 increases to a specific value and no longer changes. At this time, the expandable acoustic particle 210 reaches the assembled state, and one or more trigger conditions can continue to exist. In some embodiments, when the apparent volume of the expandable acoustic enhancement particle 210 expands to a specific value, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement particle 210 expands to its initial state, that is, 105% of its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement particle 210 expands to its initial state, that is, 110% of its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement particle 210 expands to its initial state of filling, that is, 125% of its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancing particle 210 expands to its initial state, i.e., 135% of its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancing particle 210 expands to its initial state of filling, i.e., 145% of its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancing particle 210 expands to its initial state of filling, i.e., 150% of its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, after the one or more expansion trigger conditions are removed, the expandable acoustic enhancing particle 210 immediately reaches the filled state.In some embodiments, after one or more expansion triggering conditions are removed, the expandable acoustic enhancement particles 210 need to undergo a stabilization period to reach a fully loaded state.

[0066] The expandable acoustic enhancement particles 210 loaded in the cavity 150 exert mechanical force on each other, effectively reducing or even eliminating the position movement of the expandable acoustic enhancement particles 210 in the cavity 150, thereby effectively reducing or even eliminating the collision between the expandable acoustic enhancement particles 210, and fully improving the service life of the expandable acoustic enhancement particles 210. In addition, compared with conventional acoustic enhancement particles, the expandable acoustic enhancement particles 210 have larger pore size and volume inside the particles. Under the premise of assembling the same number of expandable acoustic enhancement particles and conventional acoustic enhancement particles, the gas adsorption performance of the expandable acoustic enhancement particles in the assembled state is better than that of the conventional acoustic enhancement particles, thereby making the acoustic performance of the speaker better.

[0067] Figure 3a and Figure 3b Schematic diagram of a cross section of a cavity filled with an expandable acoustic enhancement sheet. Figure 3a An initial state of filling an expandable acoustic enhancement sheet 310 in a cavity 150 is shown. Figure 3b The state where the expandable acoustic enhancement sheet 310 is completely filled in the cavity 150 is shown.

[0068] In some embodiments, at least one side wall of the cavity 150 is a porous structure that allows gas to flow between the cavity 150 and the rest of the rear cavity of the speaker 100. In some embodiments, the cavity 150 is filled with a plurality of expandable acoustic enhancement sheets 310. The expandable acoustic enhancement sheet 310 is a porous structure with adsorption properties that can easily adsorb and desorb gas molecules. The filling amount of the expandable acoustic enhancement sheet 310 in the cavity 150 is 75%-95%. After the expandable acoustic enhancement sheet 310 is filled into the cavity 150, the cavity 150 filled with the expandable acoustic enhancement sheet 310 is subjected to one or more expansion triggering conditions. The sheet thickness of the expandable acoustic enhancement sheet 310 in the initial state of filling is 50-900 μm, and the sheet thickness can be selected according to the application scenario and requirements. The expansion triggering conditions include, but are not limited to, one or more combinations of mechanical force, temperature, humidity, sound waves, light, current, magnetic field force, chemical atmosphere, air pressure, etc. In some embodiments, when one or more expansion trigger conditions are applied, the apparent volume of the expandable acoustic enhancement sheet 310 increases to a specific value and no longer changes. At this time, the expandable acoustic enhancement sheet 310 reaches the assembled state, and one or more trigger conditions can continue to exist. In some embodiments, when the apparent volume of the expandable acoustic enhancement sheet 310 expands to a specific value, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement sheet 310 expands to its initial state, that is, 105% of its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement sheet 310 expands to its initial state, that is, 110% of its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement sheet 310 expands to its initial state of filling, that is, 125% of its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the inflatable acoustic enhancement sheet 310 expands to 135% of its initial state, i.e., its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the inflatable acoustic enhancement sheet 310 expands to 145% of its initial state, i.e., its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the inflatable acoustic enhancement sheet 310 expands to 150% of its initial state, i.e., its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, after the one or more expansion trigger conditions are removed, the inflatable acoustic enhancement sheet 310 immediately reaches the assembled state.In some embodiments, after one or more expansion triggering conditions are removed, the expandable acoustic enhancement sheet 310 needs to undergo a stabilization period to reach a fully loaded state.

[0069] The inflatable acoustic enhancement sheets 310 loaded in the cavity 150 exert mechanical force on each other, effectively reducing or even eliminating the position movement of the inflatable acoustic enhancement sheets 310 in the cavity 150, thereby effectively reducing or even eliminating the collision between the inflatable acoustic enhancement sheets 310, and fully improving the service life of the inflatable acoustic enhancement sheets 310. In addition, compared with conventional acoustic enhancement sheets, the inflatable acoustic enhancement sheets 310 have larger pore size and volume inside the sheet layer. Under the premise of assembling the same number of inflatable acoustic enhancement sheets and conventional acoustic enhancement sheets, the gas adsorption performance of the inflatable acoustic enhancement sheet in the assembled state is better than that of the conventional acoustic enhancement sheet, thereby making the acoustic performance of the speaker better.

[0070] Figure 4a and Figure 4b Schematic diagram of a cross-section of a cavity equipped with an expandable acoustic enhancement coating. Figure 4a An initial state of assembly of an expandable acoustic enhancement coating 410 in a cavity 150 is shown. Figure 4b The expandable acoustic enhancement coating 410 is shown in a completed state of assembly in the cavity 150 .

[0071] In some embodiments, at least one side wall of the cavity 150 is a porous structure that allows gas to flow between the cavity 150 and the rest of the back cavity of the speaker 100. In some embodiments, the cavity 150 is equipped with an expandable acoustic enhancement coating 410. The expandable acoustic enhancement coating 410 is a porous structure with adsorption properties that can easily adsorb and desorb gas molecules. The process of assembling the expandable acoustic enhancement coating 410 on one or more walls of the cavity 150 includes but is not limited to a combination of one or more methods such as spraying, brushing, and vapor deposition. The thickness and area of ​​the expandable acoustic enhancement coating 410 can be selected according to the acoustic performance requirements of the speaker 100. After the expandable acoustic enhancement coating 410 is assembled in the cavity 150, the cavity 150 equipped with the expandable acoustic enhancement coating 410 is subjected to one or more expansion triggering conditions. The expansion triggering conditions include but are not limited to a combination of one or more mechanical forces, temperature, humidity, sound waves, light, current, magnetic field forces, chemical atmospheres, air pressure, etc. In some embodiments, when one or more expansion trigger conditions are applied, the apparent volume of the expandable acoustic enhancement coating 410 increases to a specific value and no longer changes. At this time, the expandable acoustic enhancement coating 410 reaches the assembly completion state, and one or more trigger conditions can continue to exist. In some embodiments, when the apparent volume of the expandable acoustic enhancement coating 410 expands to a specific value, the one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement coating 410 expands to its initial assembly state, that is, 105% of its apparent volume before the expansion trigger condition is applied, the one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement coating 410 expands to its initial assembly state, that is, 110% of its apparent volume before the expansion trigger condition is applied, the one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement coating 410 expands to its initial assembly state, that is, 125% of its apparent volume before the expansion trigger condition is applied, the one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement coating 410 expands to 135% of its initial assembly state, i.e., its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement coating 410 expands to 145% of its initial assembly state, i.e., its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed. In some embodiments, when the apparent volume of the expandable acoustic enhancement coating 410 expands to 150% of its initial assembly state, i.e., its apparent volume before the expansion trigger condition is applied, the aforementioned one or more expansion trigger conditions are removed.In some embodiments, after one or more expansion trigger conditions are removed, the expandable acoustic enhancement coating 410 immediately reaches the assembled state. In some embodiments, after one or more expansion trigger conditions are removed, the expandable acoustic enhancement coating 410 needs to undergo a stabilization period to reach the assembled state.

[0072] The expandable acoustic enhancement coating 410 assembled in the cavity 150 is fixed on the wall of the cavity 150, avoiding collisions between particles after conventional acoustic enhancement particles are loaded, thereby improving the service life. The expandable acoustic enhancement coating 410 can also adapt to cavities 150 of different shapes, especially in cavities 150 with irregular shapes and narrow spaces, the filling rate of the expandable acoustic enhancement coating 410 is higher than the filling rate of the expandable acoustic enhancement particles 210 and the expandable acoustic enhancement sheet 310. In addition, compared with conventional acoustic enhancement coatings, the expandable acoustic enhancement coating 410 has increased pore size and volume inside the coating. Under the premise that the thickness of the expandable acoustic enhancement coating in the initial assembly state is the same as that of the conventional acoustic enhancement coating, the gas adsorption performance of the expandable acoustic enhancement coating in the assembled state is better than that of the conventional acoustic enhancement coating, thereby making the acoustic performance of the speaker better.

[0073] In some embodiments, the cavity 150 may be filled with only expandable acoustic enhancement particles 210, expandable acoustic enhancement sheets 310, or only equipped with expandable acoustic enhancement coatings 410. In some embodiments, the cavity 150 may be filled and / or equipped with a combination of multiple expandable acoustic enhancement particles 210, expandable acoustic enhancement sheets 310, and expandable acoustic enhancement coatings 410. In some embodiments, the cavity 150 may be filled and / or equipped with a combination of one or more expandable acoustic enhancement particles 210, expandable acoustic enhancement sheets 310, and expandable acoustic enhancement coatings 410 together with other accessories. Other accessories include, but are not limited to, a combination of one or more of plug-ins, frames, gaskets, and the like.

[0074] In some embodiments, the expandable acoustic particles 210 and / or expandable acoustic enhancement sheet 310 filled into the cavity 150 and the expandable acoustic enhancement coating 410 assembled into the cavity 150 can be put into use in the initial assembly state. During the use of the speaker, the expandable acoustic particles 210, the expandable acoustic enhancement sheet 310 and / or the expandable acoustic enhancement coating 410 increase in apparent volume under the conditions of the speaker's thermal field, electromagnetic field, airflow environment, etc., and reach the assembly completion state.

[0075] In some embodiments, the expandable acoustic enhancement particles 210 and / or the expandable acoustic enhancement sheet 310 filled into the cavity 150 and the expandable acoustic enhancement coating 410 assembled into the cavity 150 are in a filled / assembled state, and the speaker 100 including the cavity 150 is put into use. During the use of the speaker 100, the apparent volume of the expandable acoustic enhancement particles 210, the expandable acoustic enhancement sheet 310, and the expandable acoustic enhancement layer 410 may undergo a secondary change to ultimately achieve a usage state that meets the requirements.

[0076] Figure 5 Schematic diagram of the preparation process 500 of the expandable acoustic enhancement part. In step 510, an expandable acoustic enhancement slurry is prepared. In some embodiments, the gas adsorption material, the expandable material, the binder and the solvent are fully mixed to form a slurry. The gas adsorption material is an adsorbent porous material, including but not limited to a combination of one or more of molecular sieves, activated carbon, porous metal oxides, porous metal organic frameworks (MOFs), etc. The expandable material is a material whose apparent volume increases after a specific expansion trigger condition is applied. The increase in the apparent volume of the expandable material under a specific expansion trigger condition may be chemically free, such as thermal expansion, or chemically, such as foaming. The expandable material includes but is not limited to a combination of one or more of expandable microspheres, expandable graphite, and foaming materials. Among them, the expandable microspheres include but are not limited to a combination of one or more of acrylic, polyurethane, polystyrene, polyethylene, and melamine microspheres. In some embodiments, the diameter of the expandable microspheres is between 0.1-40 μm. Foaming materials include but are not limited to a combination of one or more of foamed rubber, foamed plastic, etc. The binder is used to bind the gas adsorbent material and the expandable material together, including but not limited to one or a combination of polyacrylate suspension, polystyrene acetate suspension, polyvinyl acetate suspension, polystyrene acrylate suspension and polybutadiene rubber suspension. The solvent includes but is not limited to one or a combination of water, ethanol and the like. Taking the mass of the gas adsorbent material as 100%, the mass of the expandable material is 0.1-10%, and the mass of the binder is 1-10%, wherein the mass of the binder is calculated by the amount of the solid component in the binder.

[0077] In other embodiments, the gas adsorbent material, the expandable binder and the solvent are fully mixed to form a slurry. The gas adsorbent material is a porous material with adsorption, including but not limited to a combination of one or more of molecular sieves, activated carbon, porous metal oxides, porous metal organic frameworks (MOFs), etc. The expandable binder is a binder whose apparent volume increases after a specific expansion trigger condition is applied. The increase in the apparent volume of the expandable binder under a specific expansion trigger condition may be without chemical changes, such as thermal expansion, or may be chemical changes, such as foaming. The expandable binder includes but is not limited to a combination of one or more of polyurethanes, phenolic resins, etc. The solvent includes but is not limited to a combination of one or more of water, ethanol, polyols (such as glycerol), etc. Taking the mass of the gas adsorbent material as 100%, the mass of the expandable binder is 0.5-10%, wherein the mass of the expandable binder is measured by the amount of solid components in the expandable binder. In some embodiments, the gas adsorbent material, the expandable binder, the binder and the solvent are fully mixed to form a slurry. The binder includes, but is not limited to, one or a combination of polyacrylate suspension, polystyrene acetate suspension, polyvinyl acetate suspension, polystyrene acrylate suspension, and polybutadiene rubber suspension.

[0078] In step 520, the type of the finished product is confirmed. The types of finished products include, but are not limited to, particles, sheets, coatings applied to specific devices, etc. If the type of the finished product is confirmed to be particles, the process proceeds to step 530; if the type of the finished product is confirmed to be sheets, the process proceeds to step 540; if the type of the finished product is confirmed to be a coating applied to a specific device, the process proceeds to step 560.

[0079] In step 530, the slurry prepared in step 510 is formed into expandable acoustic enhancement particles. The forming method includes but is not limited to stirring granulation, spray drying granulation, boiling granulation, spraying and dispersion misting, etc. The specific forming process parameters can be selected according to needs.

[0080] In step 540, the slurry prepared in step 510 is molded into an expandable acoustic enhancement sheet. The molding method includes but is not limited to a natural solidification method, a roasting method, a freeze-drying method, etc. The specific molding process parameters can be selected according to needs.

[0081] The next step of step 530 and step 540 is step 550. In step 550, the prepared expandable acoustic enhancement particles and / or expandable acoustic enhancement sheets are loaded onto an application device. In some embodiments, the application device is a speaker. At this point, the expandable acoustic enhancement particles and / or expandable acoustic enhancement sheets have reached an initial loading state in the speaker.

[0082] In step 560, the slurry prepared in step 510 is assembled on the application device to form an expandable acoustic enhancement coating. The assembly method includes but is not limited to spraying, brushing, vapor deposition, etc. Specific process parameters can be selected as needed. In some embodiments, the application device is a speaker. At this point, the expandable acoustic enhancement coating has reached the initial assembly state in the speaker.

[0083] Example 1

[0084] This embodiment provides an expandable acoustic enhancement particle, wherein the particle is made by a manufacturing method comprising the following steps:

[0085] 100 g of zeolite molecular sieve powder, 6 g of polyacrylate binder (the amount of binder is based on the amount of solid components in the binder), 0.5 g of acrylic ester expandable microspheres (with a diameter of 5-10 μm) and appropriate amount of water are mixed into a uniform slurry;

[0086] The slurry is then spray-dried to obtain the expandable acoustic enhancement particles, with a particle diameter of 200-400 μm.

[0087] Figure 6 This is a scanning electron micrograph of the cross section of the expandable acoustic enhancement particles prepared in Example 1. Figure 6 The continuous structure is formed by the bonding of zeolite molecular sieve powder, and the spherical structure is an expandable acrylic microsphere. The pores between the continuous structures are naturally formed during the preparation process. The pores can be used as movement channels for gas molecules, which increases the utilization rate of the inside of the expandable acoustic enhancement particles and further improves the low-frequency performance of the speaker. The outer surface of the expandable acrylic microspheres is partially bonded to the continuous structure of the zeolite molecular sieve. The expandable acrylic microspheres are evenly distributed in the continuous structure of the zeolite molecular sieve. The properties of a single expandable acoustic enhancement particle are uniform, and there is no stratification inside and outside.

[0088] Example 2

[0089] This embodiment provides an expandable acoustic enhancement particle, wherein the particle is made by a manufacturing method comprising the following steps:

[0090] 100 g of metal organic framework porous material powder, 10 g of polystyrene acrylate binder (the amount of the binder is based on the amount of the solid component in the binder), 10 g of acrylate expandable microspheres (with a diameter between 5 and 10 μm) and an appropriate amount of ethanol are mixed into a uniform slurry;

[0091] The slurry is then stirred and granulated to obtain the expandable acoustic enhancement particles, with a particle diameter of 400-600 μm.

[0092] Example 3

[0093] This embodiment provides an expandable acoustic enhancement particle, wherein the particle is made by a manufacturing method comprising the following steps:

[0094] 100 g of zeolite molecular sieve, 9 g of expandable phenolic resin binder (the amount of binder is based on the amount of solid components in the binder) and appropriate amount of water are prepared into a uniform slurry;

[0095] The slurry is then spray-dried to prepare the expandable acoustic enhancement particles, with a particle diameter of 600-900 μm.

[0096] Example 4

[0097] This embodiment provides an expandable acoustic enhancement particle, wherein the particle is made by a manufacturing method comprising the following steps:

[0098] 100 g of zeolite molecular sieve powder, 2.5 g of expandable phenolic resin binder (the amount of the binder is based on the amount of the solid component in the binder) and an appropriate amount of glycerol are prepared into a uniform slurry;

[0099] The slurry is then spray-dried to prepare the expandable acoustic enhancement particles, with a particle diameter of 600-900 μm.

[0100] Example 5

[0101] This embodiment provides an expandable acoustic enhancement sheet, wherein the expandable acoustic enhancement sheet is made by a manufacturing method comprising the following steps:

[0102] 100 g of activated carbon, 4 g of polybutadiene rubber binder (the amount of the binder is based on the amount of the solid component in the binder), 1.5 g of polyurethane expandable microspheres (with a diameter of 5-10 μm) and an appropriate amount of water are mixed into a uniform slurry;

[0103] The slurry is then poured into a specific mold and calcined to obtain the expandable acoustic enhancement sheet, with a sheet layer thickness of 200-400 μm.

[0104] Example 6

[0105] This embodiment provides an expandable acoustic enhancement coating, wherein the expandable acoustic enhancement coating is prepared by a preparation method comprising the following steps:

[0106] 100 g of zeolite molecular sieve powder, 6 g of polybutadiene rubber binder (the amount of the binder is based on the amount of solid components in the binder), 8 g of expandable graphite and an appropriate amount of water are prepared into a uniform slurry;

[0107] The slurry is then assembled onto the loudspeaker by spraying to form an expandable acoustic enhancement coating.

[0108] Comparative Example 1

[0109] This comparative example provides an acoustic enhancement material particle, wherein the particle is prepared by a preparation method comprising the following steps:

[0110] 100 g of zeolite molecular sieve powder, 6 g of polyacrylate binder (the amount of binder is based on the amount of solid components in the binder) and appropriate amount of water are prepared into a uniform slurry;

[0111] The slurry is then spray-dried to obtain the acoustic enhancement material particles, with the particle diameter being between 200 and 400 μm.

[0112] Application Example 1

[0113] This application example provides an application of the expandable acoustic enhancement particles described in Example 1 in a speaker of an electronic device, which includes the following specific steps:

[0114] Filling the expandable acoustic enhancement particles described in Example 1 into the speaker cavity 150 according to 80% of the volume of the speaker cavity 150 and encapsulating the speaker cavity 150;

[0115] The loudspeaker filled with the expandable acoustic enhancement particles described in Example 1 is subjected to a heat triggering treatment at 110° C. for 30 minutes to obtain a loudspeaker filled with the expandable acoustic enhancement particles;

[0116] The expandable acoustic enhancement particles in the speaker can just fill the cavity 150 after being heat-triggered at 110° C. for 30 minutes, and the particles are fixed by squeezing each other.

[0117] Application Example 2

[0118] This application example provides an application of the expandable acoustic enhancement particles described in Example 2 in a speaker of an electronic device, which includes the following specific steps:

[0119] Fill the expandable acoustic enhancement particles described in Example 2 into the speaker cavity 150 according to 80% of the volume of the speaker cavity 150 and package it;

[0120] The loudspeaker filled with the expandable acoustic enhancement particles described in Example 2 is subjected to a heat triggering treatment at 140° C. for 20 minutes, thereby obtaining a loudspeaker filled with the expandable acoustic enhancement particles;

[0121] The expandable acoustic enhancement particles in the speaker cavity 150 can just fill up the cavity 150 after being heat-triggered at 140° C. for 20 minutes, and the particles are fixed by squeezing each other.

[0122] Comparative application example 1

[0123] This comparative application example provides an application of the acoustic enhancement material particles described in comparative example 1 in an electronic device speaker, which includes the following specific steps:

[0124] Fill the acoustic enhancement material particles described in Comparative Example 1 into the speaker cavity 150 according to 80% of the volume of the speaker cavity 150 and package it;

[0125] The acoustic enhancement material particles in the speaker have a certain amount of free movement space.

[0126] Comparative Application Example 2

[0127] This comparative application example provides an application of the acoustic enhancement material particles described in Comparative Example 1 and conventional expandable microspheres in an electronic device speaker, which includes the following specific steps:

[0128] The acoustic enhancement material particles described in Comparative Example 1 and commercially available expandable microspheres (product model: Delta 301h) were mixed uniformly at a mass ratio of 100:1, and the resulting mixed system was filled into the speaker cavity 150 according to 80% of the volume of the speaker cavity 150 and packaged;

[0129] The filled loudspeaker is subjected to a heat trigger treatment at 110° C. for 30 minutes to obtain a loudspeaker filled with a mixed system of acoustic enhancement material particles and expandable microspheres;

[0130] After the triggering process, the expandable microspheres in the speaker squeeze the acoustic enhancement material particles so that the acoustic enhancement material particles are fixed.

[0131] Test Example 1

[0132] In this test example, the loudspeakers prepared in the above application examples 1-2 and comparative application examples 1-2 are tested for acoustic performance (F0), particle collision sound, and powder falling in a drop test, and the loudspeakers are disassembled to observe the filling state of the acoustic enhancement material therein. The tests are all carried out using conventional methods in the art, such as the specific test method for acoustic performance can refer to the "Measurement of Electrical Impedance" method shown in paragraphs 0049-0054 of Chinese patent CN105049997A. In this test example, the test environment is: the cavity 150 is a 0.2cc loudspeaker module.

[0133] The test results are shown in Table 1 below:

[0134] Table 1

[0135]

[0136] Test Example 2

[0137] This test example conducts high temperature and high humidity power-on reliability tests on the speakers made in the above application examples 1-2 and comparative application examples 1-2. The test methods are all carried out using conventional methods in the field. In this test example, the reliability test conditions are: temperature 65°C, humidity 95%RH, voltage 3.6V, pink noise signal 168H.

[0138] The test results are shown in Table 2 and Figure 7 As shown:

[0139] Table 2

[0140]

[0141] It can be seen from Table 1 and Table 2 above that the improved acoustic enhancement material particles provided in Example 1 of the present invention, i.e., the expandable acoustic enhancement particles, can fill the speaker cavity 150 after heat treatment, and the particles can be completely fixed in the speaker cavity 150 without particle collision, powder falling, etc.; in addition, in terms of acoustic performance, compared with the conventional acoustic enhancement material particles provided in Comparative Example 1, the improved acoustic enhancement material particles provided in Example 1 of the present invention have a performance improvement of about 12%, wherein "12%" is calculated according to the experimental data in Table 1 according to the following formula (1):

[0142]

[0143] In addition, in terms of reliability, compared with conventional acoustic enhancement material particles, the improved acoustic enhancement material particles provided in Example 1 of the present invention have better reliability; in summary, compared with the existing technical solutions for solving noise and powder falling, the expandable acoustic enhancement particles provided in the embodiment of the present invention have significantly better acoustic performance and reliability.

[0144] Test Example 3

[0145] This test example uses a heat transfer experiment to test the thermal conductivity of the expandable acoustic enhancement particles prepared in Example 1 and the acoustic enhancement material particles prepared in Comparative Example 1, wherein the steps of the heat transfer experiment include:

[0146] 1) The acoustic enhancement material particles prepared in Comparative Example 1 and the expandable acoustic enhancement particles prepared in Example 1 are respectively filled into a carrier tube. To simulate the actual usage scenario, the filling amount of conventional acoustic enhancement material particles and expandable acoustic enhancement particles in the carrier tube is 80% of the filling cavity volume. The carrier tube body is a hard heat-insulating material, and both axial ends are copper heat-conducting blocks, which seal the carrier tube filling cavity, and the aspect ratio of the carrier tube is greater than 5.

[0147] 2) The carrier tubes filled with conventional acoustic enhancement material particles and expandable acoustic enhancement particles were treated at 110° C. for 30 min and then cooled to room temperature.

[0148] 3) At room temperature, one axial end of the carrier tube is contacted with a constant temperature heat source (100° C.), and the other axial end is contacted with a thermocouple, and the temperature measured by the thermocouple after different time periods is recorded.

[0149] The results of the above tests are shown in Table 3 below:

[0150] Table 3

[0151] plan Starting temperature Temperature measured after 5 minutes The temperature was measured after 10 minutes. Example 1 25.1℃ 41.6℃ 49.2℃ Comparative Example 1 25.2℃ 36.4℃ 43.1℃

[0152] It can be seen from Table 3 above that compared with the conventional acoustic enhancement material particles in the art, the expandable acoustic enhancement particles provided in Example 1 of the present invention have more excellent thermal conductivity. The reason is that during the heat triggering treatment, the expandable material can increase the apparent volume of the particles. After the apparent volume of the particles increases, due to the extrusion between the particles, the contact area between the particles becomes larger and the contact becomes closer, thereby improving the thermal conductivity of the expandable acoustic enhancement particles.

[0153] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the protection scope of the patent of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with each other and with each other, and with each other.

Claims

1. A speaker, comprising one or more acoustic sensors, one or more housings, and one or more inflatable acoustic reinforcements, wherein the one or more acoustic sensors and the one or more housings are combined to form a speaker rear cavity, and one or more inflatable acoustic reinforcements in an initial state are confined in the speaker rear cavity, and one or more expansion triggering conditions are applied so that the apparent volume of the one or more inflatable acoustic reinforcements reaches a target value, thereby reaching an assembly completion state; in, The expandable acoustic enhancement member is an expandable acoustic enhancement particle. In the initial state, the diameter of the expandable acoustic enhancement particle is between 50 and 900 μm. The expandable acoustic enhancement particle is prepared by mixing the raw material used to prepare the expandable acoustic enhancement member with a solvent to obtain an expandable acoustic enhancement slurry, and then molding the slurry. The raw materials include gas adsorbent material, binder and expandable material. The amount of expandable material is 0.1-10% based on the total weight of the gas adsorbent material as 100%. The expandable material is expandable microspheres, expandable graphite or a combination of the two. In the rear cavity of the speaker, when one or more expansion-triggered conditions are applied to the expandable acoustic reinforcement, the apparent volume of the expandable acoustic reinforcement increases and the internal pore volume increases, wherein the expansion-triggered conditions include one or a combination of mechanical force, temperature, humidity, sound waves, light, electric current, magnetic field force and air pressure.

2. The loudspeaker according to claim 1, characterized in that The expandable acoustic reinforcement has uniform internal and external properties and is not delaminated.

3. The loudspeaker according to claim 1, characterized in that After application of the one or more expansion triggering conditions, the apparent volume of the inflatable acoustic reinforcement is 105-150% of its apparent volume before the expansion triggering conditions are applied.

4. The loudspeaker according to claim 1, characterized in that Based on the total weight of the gas adsorbent being 100%, the amount of the binder is 1-10%, wherein the amount of the binder is based on the amount of the solid component in the binder.

5. The loudspeaker according to claim 1, characterized in that The gas adsorption material includes one or a combination of molecular sieves, activated carbon, porous metal oxides and porous metal organic frameworks.

6. The loudspeaker according to claim 1, characterized in that The expandable adhesive includes one or a combination of polyurethane and phenolic resin adhesives.

7. The loudspeaker according to any one of claims 1 to 6, characterized in that: The method for making the expandable acoustic reinforcement member comprises: Fully mixing the raw materials for preparing the expandable acoustic enhancement member with a solvent to obtain an expandable acoustic enhancement slurry; The expandable acoustic enhancement slurry is then molded to obtain the expandable acoustic enhancement component.

8. The method for assembling a loudspeaker according to any one of claims 1 to 7, characterized in that: One or more inflatable acoustic reinforcements are assembled in the rear cavity of the speaker to reach an initial assembly state, and one or more expansion trigger conditions are applied so that the apparent volume of the one or more inflatable acoustic reinforcements reaches a target value, and the one or more inflatable acoustic reinforcements reach a completed assembly state.

9. The assembly method according to claim 8, characterized in that: The apparent volume target value of the inflatable acoustic reinforcement is 105-150% of its apparent volume when no expansion triggering condition is applied.

10. An electronic device, characterized in that: The speaker of the electronic device is the speaker according to any one of claims 1 to 7.

11. The electronic device according to claim 10, characterized in that: The electronic device includes a smart phone, a TWS headset, a head-mounted headset, smart glasses, a smart watch, a tablet computer or a thin and light laptop computer.

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