WO2022007331A1 - Acoustic adjusting material, filling method, sound production apparatus, and electronic device - Google Patents

Abstract

An acoustic adjusting material, a sound production apparatus, a filling method, and an electronic device. The acoustic adjusting material comprises an expandable high-molecular polymer filler containing styrene chain links and an acoustic improving filler, wherein the expandable high-molecular polymer filler containing the styrene chain links is foamed under a triggered condition to form a foam buffering filler, such that a buffering effect is provided for the acoustic improving filler during moving and collision; and the volume of the foamed expandable high-molecular polymer filler containing the styrene chain links changes along with changes in the temperature and/or foaming time, and when the temperature rises, damping is increased, and the buffering capacity is enhanced. In this way, the breakage risk of the acoustic improving filler is significantly reduced, the durability of the acoustic adjusting material is improved, and the service life of the acoustic adjusting material is prolonged.

Description

Acoustic adjustment material, filling method, sound generating device and electronic equipment technical field

The present invention relates to the technical field of electro-acoustic conversion, and more particularly, to an acoustic adjustment material for a sound-generating device, a filling method, a sound-generating device and electronic equipment.

Background technique

A sound-generating device, such as a receiver or a speaker, usually includes a housing and a sound-generating unit accommodated in the housing. The sound-generating unit divides the cavity in the casing into a front acoustic cavity and a rear acoustic cavity. The front acoustic cavity is communicated with the sound outlet hole, and the sound waves generated by the sounding unit are radiated from the front acoustic cavity. The rear acoustic cavity is communicated with the sounding unit. The vibrating airflow on the opposite side of the sound wave can radiate into the rear acoustic cavity. The rear cavity is used to adjust the low frequency effect of the sound-generating device.

In order to better adjust the low frequency effect, sound-absorbing particles are usually filled in the rear acoustic cavity. The sound-absorbing particles can adsorb and desorb the vibrating gas, so that the low-frequency effect of the sound-emitting device is better.

However, during the working process, the sound-absorbing particles will collide with each other, resulting in fragmentation. On the one hand, crushing will generate dust, and the dust will enter the sound-emitting unit, which will cause the sound-emitting unit to work abnormally. On the other hand, the fragmentation of the sound-absorbing particles will increase the F0 of the sound-generating device, resulting in poorer low-frequency effects.

Chinese utility model patent ZL201921855579.4 discloses a filler for a loudspeaker, the filler includes an expandable filler and an acoustic filler, wherein the expandable filler can permanently expand from a first size to a second size when the expansion is triggered, and the acoustic filler Plays a fixed role, improves the sound quality in different directions, and can reduce the movement of the acoustic filler to avoid flow noise (paragraph 0007). However, when the expansion is triggered, the expandable filler permanently expands from the initial first size to the fixed second size, the size does not change, and the size is also constant during the application process. Effective adjustment reduces the suitability of expandable fillers.

Therefore, it is necessary to provide a new technical solution to solve the above-mentioned technical problems.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a new technical solution for the acoustic adjustment material of the sound generating device.

According to a first aspect of the present invention, there is provided an acoustic adjustment material for a sound generating device. The acoustic adjustment material includes: an expandable high molecular polymer filler containing styrene chains and an acoustic improvement filler, and the expandable high molecular polymer filler containing styrene chains is foamed under a triggered condition , become a foam buffer filler to buffer the movement of the acoustic improvement filler, and the volume of the expandable polymer filler containing styrene segments after foaming varies with temperature and/or foaming time and change.

Optionally, the molecular chain of the expandable polymer filler containing styrene units contains styrene units, and the molecular structure of the styrene units is -CH(C6H5)-CH2-.

Optionally, the expandable high molecular polymer filler containing styrene segments includes expandable polystyrene, acrylonitrile-butadiene-styrene copolymer and styrene-butadiene-styrene intercalation. At least one high molecular polymer in the segmented copolymer.

Optionally, the acoustic-improving filler is a material with acoustic properties made of one or more of activated carbon, zeolite powder, silica, porous alumina, molecular sieve, and metal-organic framework material.

Optionally, the expandable polymer filler containing styrene segments is in the form of particles, flakes or blocks.

Optionally, after foaming, the density of the expandable polymer filler containing styrene segments is 0.005g/mL-0.5g/mL.

Optionally, the expandable macromolecular polymer filler containing styrene segments is granular, and after foaming, the physical size of the expandable macromolecular polymer filler containing styrene segments is 0.1 mm-20mm.

Optionally, the expandable high molecular polymer filler containing styrene segments includes a high molecular polymer material and a foaming agent mixed together, wherein the foaming agent comprises a low-boiling alkane.

Optionally, the expandable polymer filler containing styrene segments is triggered by at least one of thermal radiation, light radiation, and electromagnetic radiation.

Optionally, before foaming, the expandable polymer filler containing styrene segments accounts for 0.01%-30% of the total volume of the acoustic adjustment material; after foaming, the volume of the foam buffer filler accounts for the acoustic 0.05%-60% of the total volume of the conditioning material.

Optionally, before foaming, the expandable polymer filler containing styrene segments accounts for 0.1%-10% of the total volume of the acoustic adjustment material; after foaming, the volume of the foam buffer filler accounts for the acoustic Adjust 5%-50% of the total volume of the material.

Optionally, after foaming, the foam cushioning filler formed by the expandable polymer filler containing styrene segments forms cushioning for the acoustically improving filler.

Optionally, after foaming, the volume of the expandable polymer filler containing styrene segments is increased by 2-150 times.

Optionally, after foaming, the volume of the expandable polymer filler containing styrene segments is increased by 3-100 times.

Optionally, the foaming process of the expandable polymer filler containing styrene segments includes a first foaming stage and a second foaming stage, and the first foaming stage obtains a first foam buffer. Filler, the second foaming stage obtains the second foam buffer filler.

Optionally, the volume of the second foam buffer filler is 1-25 times the volume of the first foam buffer filler.

According to a second aspect of the present disclosure, a sound producing device is provided. The sound-generating device includes a housing, a sound-generating unit, and the above-mentioned acoustic adjustment material of the sound-generating device. The interior of the housing forms a cavity, the cavity includes a rear acoustic cavity, and the sound-generating unit is arranged in the cavity, The sound-generating unit communicates with the rear acoustic cavity, the rear acoustic cavity includes a filling area, and the acoustic adjustment material is arranged in the filling area.

Optionally, before foaming, the filling rate of the acoustic adjustment material in the filling area is 40%-95%.

Optionally, both the expandable polymer filler containing styrene segments and the acoustically improving filler are particulate materials,

The expandable macromolecular polymer filler containing styrene chain links and the acoustic improving filler are mixed and filled in the filling area.

Optionally, both the expandable polymer filler containing styrene segments and the acoustically improving filler are bulk materials,

The expandable macromolecular polymer filler containing styrene segments and the acoustic improving filler are alternately arranged; or the bulk expandable macromolecular polymer filler containing styrene segments and the block in the same layer The acoustic-improving fillers are distributed in a matrix, and the expandable polymer fillers containing styrene links and the acoustic-improving fillers are staggered.

Optionally, the expandable macromolecular polymer filler containing styrene segments forms a lattice structure, and the acoustically improved filler is filled with the expandable macromolecular polymer filler containing styrene segments. or the acoustic-improving filler forms a lattice structure, and the expandable high molecular polymer filler containing styrene segments is filled in the gaps formed by the acoustic-improving filler.

According to a third aspect of the present disclosure, there is provided a filling method of an acoustic adjustment material of a sound generating device. The acoustic adjustment material is arranged in the filling area of the rear acoustic cavity of the sound generating device in any of the following ways:

The acoustic adjustment material is in the form of granules, and the expandable macromolecular polymer filler containing styrene chain segments is first filled into the filling area, and then the acoustic improvement filler is filled into the filling area;

The acoustic adjustment material is granular, and the acoustic improvement filler is first filled into the filling area, and then the expandable macromolecular polymer filler containing styrene chain segments is filled into the filling area;

The acoustic adjustment material is in the form of particles. First, the expandable polymer filler containing styrene links and the acoustic improvement filler are mixed, and then the mixed expandable polymer containing styrene links is mixed. Filling and acoustically improving fillers are filled into the filling zone;

First, the expandable polymer filler containing styrene segments is arranged on at least one wall of the filling area to form an expandable polymer filler layer containing styrene segments, and then the acoustic Improved filler filling into the filling zone.

According to a fourth aspect of the present disclosure, an electronic device is provided. The electronic device includes the above-mentioned sound generating device.

According to one embodiment of the present disclosure, the acoustic adjustment material includes an expandable high molecular polymer filler containing styrene segments and an acoustic improving filler. After being triggered, the foaming of the expandable polymer filler containing styrene links becomes a foamed foam, and the foamed foam provides a buffering effect on the flow and collision of the acoustically improved filler. During the working process of the sound-generating device, the expandable polymer filler containing styrene links greatly reduces the risk of breakage of the acoustic-improving filler, and improves the durability and service life of the acoustic-modulating material. Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

FIG. 1 is a schematic diagram of an unfoamed state of a granular acoustic adjustment material according to an embodiment of the present disclosure.

FIG. 2 is a schematic diagram of a foamed state of a granular acoustic adjustment material according to an embodiment of the present disclosure.

FIG. 3 is a schematic diagram of an unfoamed state of a bulk acoustic adjustment material according to an embodiment of the present disclosure.

FIG. 4 is a schematic diagram of a foamed state of a block acoustic adjustment material according to an embodiment of the present disclosure.

FIG. 5 is a schematic diagram of an unfoamed state of a matrix-distributed bulk acoustic adjustment material according to an embodiment of the present disclosure.

FIG. 6 is a schematic diagram of an unfilled state of the acoustic adjustment material of the grid structure according to an embodiment of the present disclosure.

Description of reference numbers:

11: shell; 12: sound-emitting monomer; 13: gap; 14: expandable polymer filler containing styrene links; 15: acoustic-improving filler; 16: rear acoustic cavity.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

According to one embodiment of the present disclosure, there is provided an acoustic adjustment material for a sound generating device. As shown in FIGS. 1-2 , the acoustic adjustment material includes: an expandable polymer filler 14 containing styrene segments and an acoustic improving filler 15 . The expandable polymer filler 14 containing styrene links is foamed under the condition of being triggered to become a foam buffer filler, so as to buffer the movement of the acoustic improvement filler 15. The foamed volume of the expandable high molecular polymer filler 14 of vinyl links varies with temperature and/or foaming time.

The degree of buffering of the expandable polymer filler 14 containing styrene segments during the movement and collision can be flexibly controlled by the foaming temperature and time of the expandable polymer filler 14 containing styrene segments. When the expandable polymer filler 14 containing styrene segments is foamed, the temperature increases, and the damping of the expandable polymer filler 14 containing styrene segments increases, and the expandable polymer filler 14 containing styrene segments increases. The buffering capacity of the expandable high molecular polymer filler 14 of styrene segments is enhanced. Within the set time, the higher the temperature, the larger the volume of the foam cushioning filler; under the set temperature, the longer the foaming time, the larger the volume of the foam cushioning filler.

When the sound-generating device is impacted by an external force, the foam buffer filler provides a buffer force for the flow and collision of the acoustic-improving filler, and reduces the collision probability of the acoustic-improving filler. In this way, the risk of crushing of the acoustically-improving filler is greatly reduced, and the durability and service life of the acoustically-modifying material is improved.

The expandable polymer filler 14 containing styrene units refers to a polymer material that can foam under a set trigger condition. Under the untriggered condition, the expandable polymer filler 14 containing styrene segments has a smaller volume. This enables the material to be easily filled into a given cavity (eg, the filling area of the rear acoustic cavity). The material foams under triggered conditions, providing cushioning when the acoustically-improving filler collides.

The molecular chain of the expandable polymer filler containing styrene segments contains styrene segments, and the molecular structure of the styrene segments is -CH(C6H5)-CH2-. The expandable high molecular polymer filler containing styrene links includes expandable polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS) and styrene-butadiene-benzene At least one high molecular polymer in an ethylene block copolymer (SBS). All of the above materials can be triggered by thermal radiation to foam. Moreover, at different trigger temperatures, the volume after foaming is different, and the volume will change with the temperature change during the application process.

The acoustic-improving filler 15 refers to a porous material capable of adsorbing and desorbing vibrating gas. For example, acoustic adjustment materials include acoustic performance materials made of one or more of activated carbon, zeolite powder, silica, porous alumina, molecular sieves, metal-organic framework materials, and the like. The acoustic-improving filler 15 may be in the form of granules, flakes, blocks, or the like.

Specifically, the expandable polymer filler containing styrene segments is spherical, quasi-spherical, rod-shaped, cylindrical, square or radial. The above shape has good filling effect and high filling rate.

In the embodiment of the present disclosure, the acoustic adjustment material includes an expandable high molecular polymer filler 14 containing styrene links and an acoustic improvement filler 15 . The expandable polymer filler 14 containing styrene chain links is foamed under the condition of being triggered to become a foam buffer filler, so as to buffer the movement of the acoustic improvement filler 15 . During the working process of the sound-generating device, the acoustic-improving filler 15 is less likely to collide. In this way, the expandable polymer filler 14 containing styrene links greatly reduces the risk of breakage of the acoustic improvement filler 15, and improves the durability and service life of the acoustic adjustment material.

In addition, the expandable polymer filler 14 containing styrene segments forms cells after foaming. The expandable high molecular polymer material containing styrene links has elasticity, and the cells can change the volume according to the change of the external pressure, so as to form a buffering effect on the movement of the acoustic improvement filler 15 . In this way, the expandable high molecular polymer filler 14 containing styrene segments can effectively buffer the flow and collision of the acoustically improved filler 15 .

In particular, the expandable polymer filler 14 containing styrene links can effectively buffer the vibration of the acoustic adjustment material when the sound-generating device operates at high power.

In addition, when the sound generating device is impacted by external force, the cells provide buffer force for the acoustic improvement filler 15, and the gas in the cells is stagnant and compressed, so that the external energy is consumed and dissipated. The cells gradually terminate the impact load with a small negative acceleration, so the expandable polymer filler 14 containing styrene links has a good shockproof effect.

In addition, different triggering temperatures enable the expandable polymer filler 14 containing styrene segments to change the volume of foaming, thereby adapting to different application environments, which makes the acoustic adjustment material more weather-resistant and adaptable.

In one example, the expandable high molecular polymer filler 14 containing styrene chain units includes an expandable high molecular polymer material containing styrene units and a foaming agent mixed together, wherein the Blowing agents include low boiling alkanes. For example, low boiling alkanes have a boiling point of 30°C to 40°C. During preparation, in an autoclave, the expandable polymer material containing styrene segments and a blowing agent are mixed together. In the autoclave, the expandable polymer materials containing styrene segments are polymerized together and mixed with the blowing agent. The process of the method is simple, and the expandable high molecular polymer filler 14 containing styrene segments can be formed in one reaction.

It is also possible to first polymerize the expandable polymer material containing styrene units into an expandable polymer material containing styrene units, and then polymerize the expandable polymer materials containing styrene units A foaming agent is added to the material, so that the foaming agent penetrates into the expandable high molecular polymer material containing styrene segments.

The low-boiling alkane includes at least one of petroleum ether, butane, pentane, and the like. All of these materials can be volatilized under the set trigger conditions, thereby forming cells in the interior of the expandable polymer material containing styrene segments. A plurality of cells form a foam.

Of course, the types of foaming agents are not limited to the above embodiments, and those skilled in the art can select them according to actual needs.

In one example, the expandable polymer filler 14 containing styrene units is at least one of expandable PS, ABS, SBS and other high molecular polymers. All the above-mentioned expandable polymer fillers 14 containing styrene segments can foam in volume under a set trigger condition, thereby buffering the movement of the acoustically improved filler 15 .

For example, expandable polystyrene includes polystyrene and a blowing agent mixed together.

Among them, expandable polystyrene filler has the characteristics of light weight, no water absorption, anti-aging, strong corrosion performance, strong toughness, non-toxic and non-polluting.

Those skilled in the art can select the type, dosage, etc. of the foaming agent according to actual needs.

In one example, the expandable polymer filler 14 containing styrene segments is in the form of particles or lamellae. The flow of these materials is good and filling in the cavity is easy.

It is possible to directly fill the expandable macromolecular polymer filler 14 containing styrene segments in granular or lamellar form into the filling area of the rear acoustic cavity 16 of the sound generating device.

Alternatively, the granular or lamellar expandable polymer filler 14 containing styrene segments is prepared into a predetermined shape, and then filled into the filling area of the rear acoustic cavity 16 of the sound generating device.

It is also possible that one of the expandable polymer filler 14 containing styrene links and the acoustic improving filler 15 is prepared into a set three-dimensional structure, and the other is filled into the three-dimensional structure in a granular or lamellar form. within the gap.

In one example, the expandable polymer filler 14 containing styrene segments is in the form of particles. After foaming, the physical size of the expandable polymer filler 14 containing styrene segments is 0.1 mm-20 mm.

Within this size range, the expandable polymer filler 14 containing styrene segments has a good buffering effect on the acoustic improving filler 15, and a good buffering effect on the cells.

In addition, the size of the particles is moderate and will not block the airflow channel of the acoustic improving filler 15, and the acoustic adjusting material has good adsorption and desorption effects on the vibrating airflow.

Further, the expandable macromolecular polymer filler containing styrene segments is in the form of particles, and after foaming, the physical size of the expandable macromolecular polymer filler 14 containing styrene segments is 0.5 mm-2mm. Within this range, the foaming effect of the expandable polymer filler 14 containing styrene segments to form cells is better for the acoustic-improving filler.

In one example, when the acoustic improving filler is not foamed, the density of the expandable polymer filler 14 containing styrene segments is 0.2 g/mL to 1.5 g/mL. Within this density range, the overall density of the acoustic adjustment material is small, which makes the overall weight of the sound emitting device light.

Preferably, the density of the expandable polymer filler 14 containing styrene segments is 0.5g/mL-1.0g/mL, and within this range, the acoustic adjustment material has little influence on the overall weight of the sound-emitting device.

In one example, after foaming, the density of the expandable polymer filler containing styrene segments is 0.005g/mL-0.5g/mL. Within this range, the foam cushioning filler has good cushioning effect on the acoustic improvement filler, high structural strength and good durability.

Preferably, the density of the expandable polymer filler containing styrene segments is 0.01 g/mL-0.05 g/mL. Within this range, the foam cushioning filler has a better cushioning effect on the acoustic-improving filler.

In one example, the expandable polymer filler 14 containing styrene segments is triggered by at least one of thermal radiation, light radiation, and electromagnetic radiation. Under the above radiation conditions, the foaming agent in the expandable polymer filler 14 containing styrene links volatilizes and the volume becomes larger, and cells are formed in the expandable polymer material containing styrene links , so that the foaming of the expandable polymer material containing styrene links.

Under the same temperature conditions, under a certain trigger time, the volume of the expandable polymer filler 14 containing styrene segments can be increased to an appropriate value. The foaming ratio of the expanded polymer filler 14 is small, and the effect of buffering the acoustic-improving filler 15 is not achieved.

Under the same triggering time, at a certain triggering temperature, the volume of the expandable polymer filler 14 containing styrene units can be increased to an appropriate value, and the higher the temperature, the easier the cell rupture; The lower the temperature, the smaller the foamed volume of the expandable polymer filler 14 containing styrene segments, and the effect of buffering the acoustically improving filler 15 is not achieved.

In addition, the cells in the expandable high molecular polymer filler 14 containing styrene segments are not ruptured.

When light irradiation is performed, the foaming agent in the expandable polymer filler 14 containing styrene segments is triggered by means of ultraviolet irradiation. When the blowing agent is heated, the volume becomes larger, thereby forming cells in the expandable polymer filler containing styrene segments.

During electromagnetic radiation, the acoustic modulation material is heated under the action of an alternating magnetic field. The blowing agent volatilizes, thereby forming cells in the expandable high molecular polymer filler 14 containing styrene segments.

The above triggering method is easy to operate and has strong controllability of the size of the cells.

Of course, the triggering method of the expandable polymer filler 14 containing styrene segments is not limited to the above-mentioned embodiments, and those skilled in the art can choose according to actual needs.

In one example, before foaming, the expandable polymer filler containing styrene segments accounts for 0.01%-30% of the total volume of the acoustic adjustment material; after foaming, the expandable polymer fillers containing styrene segments The volume ratio of the expandable polymer filler 14 to the acoustic adjustment material is 0.05%-60%.

Before foaming, within the above ratio range, the proportion of the acoustic improvement filler is large, which can ensure that the acoustic improvement filler is uniformly dispersed in the cavity.

The larger the proportion of the expandable polymer filler 14 containing styrene links in the acoustic adjustment material, the smaller the filling amount of the acoustic improvement filler 15 will be, and the adsorption and desorption of the vibration gas of the acoustic adjustment material will be reduced. On the contrary, the smaller the proportion of the expandable polymer filler 14 containing styrene segments in the acoustic adjustment material, the less the buffer effect can be achieved.

In the above volume ratio range, although the filling amount of the acoustic improving filler 15 is relatively reduced, the expandable polymer filler 14 containing styrene segments can form channels after foaming, so that the vibrating gas can easily enter, Therefore, the sound absorption effect of the acoustic adjustment material is significantly improved.

Due to the buffering effect of the expandable polymer filler 14 containing styrene segments, the acoustic improvement filler 15 has a good shape-retaining effect and good durability.

Further, before foaming, the expandable polymer filler containing styrene segments accounts for 0.1%-10% of the total volume of the acoustic adjustment material; after foaming, the volume of the foam buffer filler accounts for the acoustic adjustment material. 5%-50% of the total volume of the material. Within this range, the sound absorption effect of the acoustic adjustment material is better and the durability is better.

In one example, the mass of the expandable polymer filler 14 containing styrene segments accounts for 0.1%-20% of the total mass of the acoustic adjustment material. Within this range, a relatively high filling rate in the cavity can be achieved with less expandable polymer filler 14 containing styrene segments.

In addition, since the mass ratio of the expandable polymer filler 14 containing styrene links is relatively low, the effect of the acoustic adjustment material in adsorbing and desorbing the vibrating gas will not be affected.

Further, the mass of the expandable polymer filler 14 containing styrene segments accounts for 1%-5% of the total mass of the acoustic adjustment material. Within this range, the durability of the acoustic adjustment material is good, and the effect of adsorbing and desorbing the vibrating gas is good.

In a specific example, the foaming process of the expandable polymer filler 14 containing styrene segments includes a first foaming stage and a second foaming stage, and the first foaming stage obtains the first foaming stage. A foam cushioning filler, and the second foaming stage obtains a second foam cushioning filler. The buffering effect of the expandable high molecular polymer filler 14 containing styrene segments can be flexibly controlled by the staged foaming of the expandable high molecular polymer filler 14 containing styrene segments.

Under the triggering condition, the foamed volume of the expandable polymer filler 14 containing styrene segments varies with different temperatures and/or foaming times. In application after foaming, the first foam buffer filler will undergo a second-stage foaming process with the change of use temperature. During the second-stage foaming process, with different temperatures and/or foaming time, foaming Volume is different. After foaming, because the first foam buffer filler occupies the volume of the back cavity, it has a certain inhibitory effect on the acoustic improvement effect.

Therefore, in the initial stage of filling, the expandable polymer filler 14 containing styrene segments is foamed in the first stage, and the first foam buffer filler provides a certain buffer effect. In the actual application process, if the sound-generating device runs at high power in a high-temperature environment, when the sound-generating device is in high-power operation, the adhesive of the acoustic improvement filler will age, the strength will deteriorate, and the acoustic improvement filler will be easily broken. Under this condition, the expandable polymer filler 14 containing styrene segments is also easier to continue to foam, further improving the damping characteristics of the surface of the first foam cushioning filler, and providing a buffer for the collision of the acoustically improved filler , thereby reducing the fragmentation of the acoustically improved filler.

Even under normal conditions, the acoustic-improving filler adhesive will slowly age over time, resulting in a loss of strength. During this process, the volume of the first foam buffer filler is also slowly changing, the surface damping properties are increased, and the buffer capacity is enhanced. Under this condition, the expandable polymer filler 14 containing styrene segments can be In the second stage, the foaming changes, the damping is enhanced, and the buffering effect is improved, which effectively avoids the fragile phenomenon caused by the deterioration of the acoustic improvement filler.

Specifically, referring to Table 1, the volume of the expandable polymer filler 14 containing styrene segments after foaming varies with the foaming temperature and/or foaming time. Within a certain temperature range, When the temperature rises, the damping of the expandable polymer filler containing styrene segments increases, and the buffering capacity of the expandable polymer filler containing styrene segments increases; within a certain temperature range When the time increases, the damping of the expandable macromolecular polymer filler containing styrene segments increases, and the buffering capacity of the expandable macromolecular polymer filler containing styrene segments increases. Therefore, the degree of foaming of the expandable polymer filler 14 containing styrene segments can be controlled by the foaming temperature and/or the foaming time.

Table 1-Volume vs. temperature data for the first foaming stage of expandable materials

When the expandable high molecular polymer filler 14 containing styrene segments is used in the sound-emitting device, if the expandable high molecular polymer filler 14 containing styrene segments has been foamed to the maximum foaming volume, the acoustics are improved. The strength of the filler 15 will be weakened during long-term high temperature use, and there is still a risk of breakage. If the first foam buffer filler is obtained by subjecting the expandable polymer filler 14 containing styrene segments through the first foaming stage, and the first foam buffer filler is not foamed to the maximum foaming volume, it will contain The expandable macromolecular polymer filler 14 with styrene links is used in the sound-generating device. During the long-term high-temperature use of the sound-generating device, the expandable macromolecular polymer filler 14 containing styrene segments will undergo the first step at high temperature. In the second foaming stage, at this time, the expandable polymer filler 14 containing styrene segments can continue to foam, and the expandable polymer filler 14 containing styrene segments can also be expanded after the volume increases. The acoustic improvement filler 15 serves as a further buffer to ensure the service life of the acoustic improvement filler 15 .

During the long-term high-frequency use of the sound-emitting device, the expandable polymer filler 14 containing styrene segments may frequently undergo multiple high-temperature foaming processes. Therefore, the second foaming stage here does not only refer to one. The foaming stage may also include multiple foaming stages. For example, when the sound-generating device is operated for a long time and with high power, a higher temperature will be generated inside the sound-generating device. At this time, the expandable polymer filler 14 containing styrene segments can be in the foaming stage. The expandable polymer filler 14 containing styrene segments will undergo multiple foaming processes during long-term and high-power operation.

Optionally, the volume of the second foam buffer filler is 1-25 times the volume of the first foam buffer filler.

Specifically, after the first-stage foaming of the expandable polymer filler 14 containing styrene segments, if the maximum foam volume is not reached, the expandable polymer filler 14 containing styrene segments continues to undergo the second-stage foaming. The volume of the expanded polymer filler 14 can be further increased.

In a specific embodiment, referring to Table 2, when the expandable polymer filler 14 containing styrene segments is in the range of 80-100° C., the volume of foaming increases with the increase of temperature.

Table 2 - Data of volume change with temperature in the second foaming stage of expandable materials

Specifically, before foaming, the physical size of the expandable polymer filler 14 containing styrene segments can be comparable to the physical size of the acoustic improving filler 15, which facilitates the polymerization of the expandable polymer filler containing styrene segments The physical size of the filler 14 and the filler 15 for improving the acoustics can be mixed evenly; the physical size of the filler 14 containing styrene links can also be larger or smaller than the physical size of the filler 15 for improving the acoustics, which is convenient for improving the performance of the acoustic adjustment material. filling amount. After foaming, the volume of the expandable polymer filler 14 containing styrene segments is significantly increased, and the density is significantly reduced, which can provide a significant buffering effect on the acoustic-improving filler 15 when it moves and collides.

According to another embodiment of the present disclosure, a sound producing device is provided. The sound-generating device includes a housing 11 , a sound-generating unit 12 and the acoustic adjustment material of the sound-generating device provided by the present disclosure. The interior of the housing 11 forms a cavity. The cavity includes a rear acoustic cavity 16 . The rear acoustic cavity 16 includes the filling area. The filling area may be the entire rear acoustic cavity 16 , or may be a part of the space of the rear acoustic cavity 16 . The sounding unit 12 is arranged in the cavity. The sound generating unit 12 communicates with the rear sound cavity 16 . The acoustic adjustment material is disposed within the filling zone.

The sounding device has the characteristics of good sounding effect, good low frequency effect and good durability.

In one example, the fill rate of the acoustic modulating material in the filling zone is 50%-95% in an untriggered condition. Within this ratio range, the foaming of the expandable polymer filler 14 containing styrene segments can provide a buffering effect on the flow and collision of the acoustically improved filler.

Preferably, the filling rate of the acoustic adjustment material in the filling area is 60%-85% under the condition of not being triggered. Within this range, after being triggered, the acoustic adjustment material can better play a buffering role, and can provide buffers for the flow and collision of the acoustic improvement filler, and prevent the acoustic improvement filler from breaking.

In one example, as shown in Figs. 3-4, the expandable polymer filler 14 containing styrene chain units and the acoustic improving filler 15 are both bulk materials. The expandable polymer fillers 14 containing styrene segments and the acoustically improving fillers 15 are alternately arranged. In this example, the expandable polymer filler 14 containing styrene segments in the arrangement direction of the two fillers can effectively squeeze the acoustic improvement filler 15, so that the acoustic improvement filler 15 can effectively buffer.

In one example, as shown in FIG. 5 , the bulk expandable polymer filler 14 containing styrene links and the bulk acoustic improving filler 15 in the same layer are distributed in a matrix and contain styrene chains The expandable macromolecular polymer filler 14 and the acoustic improvement filler 15 of the nodes are arranged in a staggered manner.

In this example, in the foamed state, the expandable polymer filler 14 containing styrene segments can effectively squeeze the acoustic improvement filler 15 in all directions in the same layer, thereby effectively buffering the acoustic improvement filler 15 sports.

In one example, as shown in FIG. 6 , the expandable polymer filler 14 containing styrene segments forms a lattice structure. The acoustic-improving filler 15 is filled in the gap 13 formed by the expandable polymer filler 14 containing styrene segments.

Alternatively, the acoustic improving filler 15 forms a grid structure. The expandable high molecular polymer filler 14 containing styrene segments is filled in the gap 13 formed by the acoustic improving filler 15 .

For example, the grid cells of the grid structure are rectangular, circular, elliptical, triangular, or rhombic. The grid structure makes the structure of the acoustic adjustment material regular, and the stability and consistency of the adsorption and desorption of the vibrating gas are good.

When filling, the shell 11 is opened, and the grid structure is first placed in the filling area; then, the acoustic improvement filler 15 or the expandable polymer filler 14 containing styrene links is filled in the grid structure In the formed gap 13; next, the shell 11 is closed; finally, the expandable polymer filler 14 containing styrene segments is foamed by means of heat radiation or the like.

All of the above filling methods can realize the foaming of the expandable polymer filler 14 containing styrene segments after triggering, and then squeeze the acoustic improving filler 15 to form a buffering effect.

In one example, after foaming, the volume of the expandable polymer filler containing styrene segments increases by 2-100 times. In this way, the foam cushioning filler has a good cushioning effect on the acoustic-improving filler 15 .

Preferably, after foaming, the volume of the expandable polymer filler containing styrene segments is increased by 3-50 times. Within this range, the cushioning force of the foam cushioning filler is moderate, and the cushioning effect is better.

According to another embodiment of the present disclosure, a filling method of an acoustic adjustment material is provided. The acoustic adjustment material is arranged in the filling area of the rear acoustic cavity of the sound generating device in any of the following ways:

In one example, the acoustic modulating material is disposed within the filling zone in any of the following ways:

For example, as shown in FIGS. 1-2 , the acoustic adjustment material is in the form of particles. The expandable polymer filler 14 containing styrene chain links is first filled into the filling area, and then the acoustic improving filler 15 is filled into the filling area. In this example, the housing 11 is provided with a filling hole. During filling, the granules are filled from the filling hole into the filling zone. It is possible that the acoustic improving filler 15 employs particles of different physical sizes. The expandable macromolecular polymer filler 14 containing styrene links also adopts particles of different physical sizes, so that the filling rate of the acoustic adjustment material in the filling area is high.

It is also possible that both the acoustic improving filler 15 and the expandable macromolecular polymer filler 14 containing styrene segments use particles of the same physical size, so as to ensure the consistency of the acoustic adjustment material.

For example, the acoustic modulation material is in granular form. The acoustic improvement filler 15 is first filled into the filling area, and then the expandable polymer filler 14 containing styrene chain segments is filled into the filling area. Likewise, during filling, the granules are filled from the filling hole into the filling zone. It is possible that the acoustic improving filler 15 employs particles of different physical sizes. The expandable macromolecular polymer filler 14 containing styrene links also adopts particles of different physical sizes, so that the filling rate of the acoustic adjustment material in the filling area is high.

For example, the acoustic modulation material is in granular form. The expandable polymer filler 14 containing styrene segments and the acoustic improving filler 15 are first mixed, and then the mixed expandable polymer filler containing styrene segments is mixed 14 and the acoustically improving filler 15 are filled into the filling zone.

Likewise, during filling, the granules are filled from the filling hole into the filling zone. It is possible that the acoustic improving filler 15 employs particles of different physical sizes. The expandable macromolecular polymer filler 14 containing styrene links also adopts particles of different physical sizes, so that the filling rate of the acoustic adjustment material in the filling area is high.

For example, as shown in FIGS. 3 to 4 , firstly, the expandable polymer filler 14 containing styrene segments is disposed on at least one wall of the filling area, so as to form an expandable polymer filler containing styrene segments. High molecular polymer filler layer; then, the acoustic improvement filler 15 is filled into the filling area.

In this example, the acoustic modulation material may be in granular or lamellar form. The expandable macromolecular polymer filler 14 containing styrene links is bonded to at least one wall of the filling area by using an adhesive. The acoustic improving filler 15 is then filled into the filling zone. Under the triggering condition, the expandable polymer filler 14 containing styrene segments in the wall portion is foamed, so as to squeeze the acoustic improvement filler 15 to buffer the movement of the acoustic improvement filler 15 . The foamed expandable polymer filler 14 containing styrene segments plays a buffering role for the acoustic improvement filler 15 .

Optionally, an expandable high molecular polymer filler layer containing styrene segments is formed on two opposite walls of the cavity. Under the condition of being triggered, the expandable polymer filler 14 containing styrene segments in the two walls is foamed, so that the acoustic improvement filler 15 is squeezed in two opposite directions, which makes the foam body The cushioning filler has a better cushioning effect on the acoustic improvement filler 15 .

In addition, the expandable polymer filler layer containing styrene segments after foaming forms a buffering effect on the opposite sides of the acoustic improvement filler 15, which makes the acoustic adjustment material more durable.

Further, an expandable polymer filler layer containing styrene segments is formed on all the walls of the cavity. In this way, the expandable macromolecular polymer filler layer containing styrene chain units forms a buffering effect in any direction of the acoustic improving filler 15, which makes the acoustic adjusting material more durable.

According to yet another embodiment of the present disclosure, an electronic device is provided. Electronic devices can be, but are not limited to, mobile phones, tablet computers, smart watches, game consoles, learning machines, and the like.

The electronic device includes the sound generating device of the embodiment of the present disclosure. The electronic device is characterized by good acoustics.

<Example 1>

The acoustic adjustment material includes acoustic improving filler 15 and expandable polystyrene filler. The material of the acoustic improvement filler 15 is zeolite, the physical size is 0.3mm-0.5mm, and the density is 0.5g/mL. The mass fraction of expandable polystyrene filler is 3%.

The sound generating device is a miniature speaker module. The volume of the rear acoustic cavity 16 of the micro speaker module is 0.4cc. The acoustic adjustment material is mixed and filled into the rear acoustic cavity 16 .

After the filling is completed, the micro speaker module is placed in an oven and heated for 20 minutes at a temperature of 100° C. to foam the expandable polystyrene filler.

The foamed foam has a physical size of 1.5 mm, a density of 0.02 g/mL, and the volume of the foam accounts for 20% of the volume of the acoustic material filling mixture.

<Comparative Example 1>

In this example, the acoustic tuning material and speaker module are consistent with the embodiment. Among them, the expandable polystyrene filler was not triggered.

<Comparative Example 2>

The material of the acoustic adjustment material is zeolite, the physical size is 0.3mm-0.5mm, and the density is 0.5g/mL.

The sound generating device is a miniature speaker module. This module is the same model as the module used in the embodiment. The acoustic adjustment material is filled into the rear acoustic cavity 16 .

<test item>

1. F0 test: Test the frequency response curves of the three micro-speaker modules respectively, and obtain the F0 of the three micro-speaker modules.

2. Reliability test: Under the same power, the three miniature speaker modules work for 100 hours. Then, test the F0 of the three micro-speaker modules again.

After the test is completed, the acoustic adjustment materials of the three miniature speaker modules are taken out, and the particle integrity of the acoustic improvement filler 15 is observed.

<Test result>

Table 1 - F0 comparison table of three miniature speaker modules

	Comparative Example 2	Comparative Example 1	Example 1
Micro speaker module F0	786Hz	785Hz	783Hz

It can be seen from Table 1 that the F0 difference of the three micro-speakers is very small. This shows that in Example 1, although foaming occupies part of the volume in the back cavity, it does not affect the adsorption and desorption effects of the acoustic adjustment material on the vibrating gas.

Table 2 - Reliability comparison table of two miniature speaker modules

It can be seen from Table 2 that after the reliability test, the F0 of the micro-speaker module of Example 1 changes very little, and the particle state does not change. On the other hand, the F0 of the micro-speaker module of Comparative Example 2 increased significantly, and the particles were severely broken.

This shows that since the particles of the acoustic adjustment material do not change, the reliability of the acoustic adjustment material used in this embodiment is significantly better than that of the acoustic adjustment material used in Comparative Example 2.

<Example 2>

The acoustic adjustment material includes acoustic improving filler 15 and expandable polystyrene filler. The material of the acoustic improvement filler 15 is zeolite, the physical size is 0.3mm-0.5mm, and the density is 0.5g/mL. The mass fraction of expandable polystyrene filler is 3%.

The sound generating device is a miniature speaker module. The volume of the rear acoustic cavity 16 of the micro speaker module is 0.4cc. The acoustic adjustment material is mixed and filled into the rear acoustic cavity 16 .

After the filling is completed, the micro speaker module is placed in an oven and heated for 20 minutes at a temperature of 100° C. to foam the expandable polystyrene filler.

After foaming, the physical size of the foam becomes 0.4 mm, the density is 0.03 g/mL, and the volume of the foam accounts for 8% of the volume of the acoustic material filling mixture.

<Comparative Example 3>

In this example, the acoustic tuning material and speaker module are consistent with the embodiment. Among them, the expandable polystyrene filler was not triggered.

<Comparative Example 4>

The material of the acoustic adjustment material is zeolite, the physical size is 0.3mm-0.5mm, and the density is 0.5g/mL.

The sound generating device is a miniature speaker module. This module is the same model as the module used in the embodiment. The acoustic adjustment material is filled into the rear acoustic cavity 16 .

<test item>

1. F0 test: Test the frequency response curves of the three micro-speaker modules respectively, and obtain the F0 of the three micro-speaker modules.

2. Reliability test: Under the same power, the three miniature speaker modules work for 100 hours. Then, test the F0 of the three micro-speaker modules again.

After the test is completed, the acoustic adjustment materials of the three miniature speaker modules are taken out, and the particle integrity of the acoustic improvement filler 15 is observed.

<Test result>

Table 3 - F0 comparison table of three miniature speaker modules

Acoustic conditioning material	Comparative Example 4	Comparative Example 3	Example 2
Micro speaker module F0	786Hz	785Hz	785Hz

It can be seen from Table 3 that the F0 difference of the three micro-speakers is very small. This shows that in Example 2, although the foam occupies part of the volume of the cavity, it does not affect the adsorption and desorption effects of the acoustic adjustment material on the vibrating gas.

Table 4 - Reliability comparison table of two miniature speaker modules

It can be seen from Table 4 that after the reliability test, the F0 of the micro-speaker module of Example 2 changed by 39 Hz, the sound-absorbing particles were partially broken, and the buffering effect was reduced, which affected the acoustic performance of the micro-speaker module.

This shows that, since there are few expanded polystyrene particles in the particles of the acoustic adjustment material, it cannot provide sufficient buffering effect for the sound-absorbing particles, so some sound-absorbing particles are broken.

<Example 3>

The acoustic adjustment material includes acoustic improving filler 15 and expandable polystyrene filler. The material of the acoustic improvement filler 15 is zeolite, the physical size is 0.3mm-0.5mm, and the density is 0.5g/mL. The mass fraction of expandable polystyrene filler is 0.5%.

The sound generating device is a miniature speaker module. The volume of the rear acoustic cavity 16 of the micro speaker module is 0.4cc. The acoustic adjustment material is mixed and filled into the rear acoustic cavity 16 .

After the filling is completed, the micro speaker module is placed in an oven and heated for 20 minutes at a temperature of 100° C. to foam the expandable polystyrene filler.

After foaming, the physical size of the foam becomes 20 mm, the density is 0.09 g/mL, and the volume of the foam accounts for 48% of the volume of the acoustic material filling mixture.

<Comparative Example 5>

In this example, the acoustic tuning material and speaker module are consistent with the embodiment. Among them, the expandable polystyrene filler was not triggered.

<Comparative Example 6>

The material of the acoustic adjustment material is zeolite, the physical size is 0.3mm-0.5mm, and the density is 0.5g/mL.

The sound generating device is a miniature speaker module. This module is the same model as the module used in the embodiment. The acoustic adjustment material is filled into the rear acoustic cavity 16 .

<test item>

1. F0 test: Test the frequency response curves of the three micro-speaker modules respectively, and obtain the F0 of the three micro-speaker modules.

2. Reliability test: Under the same power, the three miniature speaker modules work for 100 hours. Then, test the F0 of the three micro-speaker modules again.

After the test is completed, the acoustic adjustment materials of the three miniature speaker modules are taken out, and the particle integrity of the acoustic improvement filler 15 is observed.

<Test result>

Table 5 - F0 comparison table of three miniature speaker modules

Acoustic conditioning material	Comparative Example 6	Comparative Example 5	Example 3
Micro speaker module F0	786Hz	785Hz	813Hz

It can be seen from Table 5 that the F0 of the speaker of Example 3 is 27 Hz lower than that of Comparative Example 6. This shows that in Example 3, the expandable polystyrene occupies a larger volume of the cavity after foaming, which affects the low-frequency acoustic performance of the speaker module.

Table 6 - Reliability comparison table of two miniature speaker modules

It can be seen from Table 6 that after the reliability test, the F0 of the micro-speaker module of Example 3 changed by 5 Hz, but the foamed polystyrene foam slightly affected the initial F0 of the micro-speaker module, and the particles were deformed. The phenomenon.

The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Repeat.

Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are provided for illustration only and not for the purpose of limiting the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims (21)

1. An acoustic adjustment material, characterized in that it comprises: an expandable high molecular polymer filler containing styrene segments and an acoustic improving filler, the expandable high molecular polymer filler containing styrene segments being triggered Foaming is carried out under certain conditions to become a foam buffer filler, so as to provide a buffer effect for the acoustic improvement filler during movement and collision, and the volume of the expandable polymer filler containing styrene segments after foaming increases with varies with temperature and/or foaming time.
2. The acoustic adjustment material according to claim 1, wherein the molecular chain of the expandable polymer filler containing styrene units contains styrene units, and the molecular structure of the styrene units For -CH(C6H5)-CH2-.
3. The acoustic adjustment material according to claim 2, wherein the expandable polymer filler containing styrene segments comprises expandable polystyrene, acrylonitrile-butadiene-styrene copolymer and at least one high molecular polymer in styrene-butadiene-styrene block copolymer.
4. The acoustic adjustment material according to claim 1, wherein the acoustic improvement filler is made of one or more of activated carbon, zeolite powder, silica, porous alumina, molecular sieve, and metal-organic framework material materials with acoustic properties.
5. The acoustic adjustment material according to claim 1, wherein the expandable polymer filler containing styrene chain units is in the form of particles, sheets or blocks.
6. The acoustic adjustment material according to claim 1, characterized in that, after foaming, the density of the expandable polymer filler containing styrene segments is 0.005g/mL-0.5g/mL.
7. The acoustic adjustment material according to claim 1, wherein the expandable polymer filler containing styrene units is in the form of particles, and after foaming, the expandable polymer filler containing styrene units is in the form of particles. The physical size of the high molecular polymer filler is 0.1mm-20mm.
8. The acoustic adjustment material according to claim 1, wherein the expandable high molecular polymer filler containing styrene segments comprises a high molecular polymer material and a foaming agent mixed together, wherein the Blowing agents include low boiling alkanes.
9. The acoustic adjustment material according to claim 1, wherein the expandable polymer filler containing styrene segments is triggered by at least one of thermal radiation, light radiation, and electromagnetic radiation.
10. The acoustic adjustment material according to claim 1, wherein, before foaming, the expandable polymer filler containing styrene segments accounts for 0.01%-30% of the total volume of the acoustic adjustment material; After foaming, the volume of the foam cushioning filler accounts for 0.05%-60% of the total volume of the acoustic adjustment material.
11. The acoustic adjustment material according to claim 1, characterized in that, before foaming, the expandable polymer filler containing styrene segments accounts for 0.1%-10% of the total volume of the acoustic adjustment material; After foaming, the volume of the foam cushioning filler accounts for 5%-50% of the total volume of the acoustic adjustment material.
12. The acoustic adjustment material according to any one of claims 1-11, characterized in that, after foaming, the foam cushioning filler formed by the expandable high molecular polymer filler containing styrene segments has a negative impact on the The acoustic-improving filler provides a cushioning effect when moving and colliding.
13. The acoustic adjustment material according to claim 1, wherein the foaming process of the expandable polymer filler containing styrene segments comprises a first foaming stage and a second foaming stage, and the The first foaming stage obtains the first foam buffer filler, and the second foaming stage obtains the second foam buffer filler.
14. The acoustic adjustment material according to claim 13, wherein the volume of the second foam buffer filler is 1-25 times the volume of the first foam buffer filler.
15. A sound-generating device, characterized in that it comprises a housing, a sound-generating unit and the acoustic adjustment material according to any one of claims 1-14, the interior of the housing forms a cavity, and the cavity comprises A rear acoustic cavity, the sound generating unit is arranged in the cavity, the sound generating unit is communicated with the rear acoustic cavity, the rear acoustic cavity includes a filling area, and the acoustic adjustment material is arranged in the filling area.
16. The sound-generating device according to claim 15, wherein, before foaming, the filling rate of the acoustic adjustment material in the filling area is 40%-95%.
17. The sound-generating device according to claim 15, wherein the expandable polymer filler containing styrene links and the acoustic-improving filler are both granular materials,

    The expandable macromolecular polymer filler containing styrene chain links and the acoustic improving filler are mixed and filled in the filling area.
18. The sound-generating device according to claim 15, wherein the expandable polymer filler containing styrene links and the acoustic-improving filler are both bulk materials,

    The expandable macromolecular polymer filler containing styrene segments and the acoustic improving filler are alternately arranged; or the bulk expandable macromolecular polymer filler containing styrene segments and the block in the same layer The acoustic-improving fillers are distributed in a matrix, and the expandable polymer fillers containing styrene segments and the acoustic-improving fillers are staggered.
19. The sound-generating device according to claim 15, wherein the expandable polymer filler containing styrene links forms a lattice structure, and the acoustic improvement filler is filled in the styrene links-containing filler. In the gap formed by the expandable polymer filler; or

    The acoustic improvement filler forms a lattice structure, and the expandable polymer filler containing styrene chain segments is filled in the gaps formed by the acoustic improvement filler.
20. A method for filling an acoustic adjustment material of a sound generating device, characterized in that, the acoustic adjustment material according to any one of claims 1-14 is arranged in the filling area of the rear acoustic cavity of the sound generating device in any of the following manners :

    The acoustic adjustment material is in the form of granules, and the expandable macromolecular polymer filler containing styrene chain segments is first filled into the filling area, and then the acoustic improvement filler is filled into the filling area;

    The acoustic adjustment material is granular, and the acoustic improvement filler is first filled into the filling area, and then the expandable macromolecular polymer filler containing styrene chain segments is filled into the filling area;

    The acoustic adjustment material is in the form of particles, and the expandable high molecular polymer filler containing styrene links and the acoustic improvement filler are mixed first, and then the mixed expandable high molecular polymer containing styrene links is mixed. Filling and acoustically improving fillers are filled into the filling zone;

    First, the expandable polymer filler containing styrene segments is arranged on at least one wall of the filling area to form an expandable polymer filler layer containing styrene segments, and then the acoustic Improved filler filling into the filling zone.
21. An electronic device, characterized in that it comprises the sound producing device according to any one of claims 15-19.

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