WO2022007334A1

WO2022007334A1 - Acoustic adjusting material for sound production apparatus, sound production apparatus, filling method and electronic device

Info

Publication number: WO2022007334A1
Application number: PCT/CN2020/136719
Authority: WO
Inventors: 潘泉泉; 凌风光; 李春; 张成飞; 刘春发
Original assignee: 歌尔股份有限公司
Priority date: 2020-07-10
Filing date: 2020-12-16
Publication date: 2022-01-13
Also published as: CN111534019A

Abstract

Provided are an acoustic adjusting material for a sound production apparatus, the sound production apparatus, a filling method and an electronic device. The acoustic adjusting material comprises a buffer filler and an acoustic improvement filler. The buffer filler is foamed under a triggered condition to form a foamed body buffer filler so as to provide a buffer effect for the acoustic improvement filler during moving collision, and the volume of the foamed buffer filler is changed along with the change in temperature and/or foaming time, so that different buffer effects can be achieved. According to embodiments, the buffer degree of the buffer filler to the acoustic improvement filler during moving collision is flexibly controlled by means of the foaming temperature and time of the buffer filler. In the working process of the sound production device, the buffer filler greatly reduces the risk of breakage of the acoustic improvement filler, the durability of the acoustic adjusting material is improved, and the service lifetime of the acoustic adjusting material is prolonged.

Description

Acoustic adjustment material for sound-generating device, sound-generating device, filling method, and electronic equipment

technical field

The present application relates to the technical field of electro-acoustic conversion, and in particular, the present application relates to an acoustic adjustment material for a sound-generating device, a sound-generating device, a filling method, and an electronic device.

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 Application No. 201921855579.4 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. Acoustic fillers play a fixed role, improving the sound quality of the speaker in different directions and avoiding the generation of flow noise. However, the expandable filler of this application permanently expands from an initial first size to a fixed second size when the expansion is triggered, the expandable filler does not change under the condition of the second size, and the size of the expandable filler during use of the speaker It is also constant, and the degree of expansion of the expandable filler cannot be effectively adjusted according to different environmental conditions of loudspeaker use, resulting in a single performance of the loudspeaker, which limits the applicability of the expandable filler.

SUMMARY OF THE INVENTION

Embodiments of the present application provide an acoustic adjustment material for a sounding device, a sounding device, a filling method, and an electronic device, so as to solve the problem of low applicability of existing acoustic adjustment materials.

In order to solve the above problems, the embodiments of the present application adopt the following technical solutions:

In a first aspect, an embodiment of the present application provides an acoustic adjustment material for a sound generating device, including:

A buffer filler and an acoustic improvement filler, the buffer filler foams under the condition of being triggered to become a foam buffer filler, so as to provide a buffer effect for the acoustic improvement filler when moving and collided, and the foamed buffer filler is foamed. Volume varies with temperature and/or foaming time.

Optionally, during the foaming process, when the temperature increases, the damping of the buffer filler increases, and the buffer capacity of the buffer filler increases.

Optionally, the buffer filler is granular, and the physical size of the buffer filler after foaming is in the range of 0.1-25 mm.

Optionally, the buffer filler is layered, and the thickness of the buffer filler after foaming ranges from 0.01 to 5 mm.

Optionally, the density range of the buffer filler after foaming is 0.01-2 g/mL.

Optionally, the buffer filler includes a high molecular polymer filler and a foaming agent mixed together.

Optionally, the buffer filler is triggered by at least one of thermal radiation, optical radiation, and electromagnetic radiation.

Optionally, before foaming, the buffer filler accounts for 0.01%-35% of the total volume of the acoustic adjustment material; after foaming, the volume of the foam cushion filler accounts for 0.05%-65% of the total volume of the acoustic adjustment material.

Optionally, the buffer filler is triggered by a physical foaming method or a chemical foaming method.

Optionally, the volume of the foam buffer filler is 2-200 times the volume of the buffer filler.

Optionally, the physical size of the buffer filler before foaming is 10% to 500% of the physical size of the acoustic improvement filler, and the physical size of the buffer filler after foaming is 100% of the physical size of the acoustic improvement filler. ~800%.

Optionally, the foaming process of the buffer filler includes a first foaming stage and a second foaming stage, the first foaming stage obtains a first foam buffer filler, and the second foaming stage obtains a second foam. Foam cushioning padding.

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

In a second aspect, embodiments of the present application provide a sound-generating device, including a housing, a sound-generating unit, and the acoustic adjustment material of the sound-generating device described in the first aspect, wherein a cavity is formed inside the housing, and the cavity is It includes a rear acoustic cavity, the sounding unit is arranged in the cavity, the sounding monomer 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 .

Optionally, before foaming, the filling rate of the acoustic adjustment material in the filling area is 50%-95%.

Optionally, both the buffer filler and the acoustic improvement filler are granular materials, and the buffer filler and the acoustic improvement filler are mixed and filled in the filling area.

Optionally, the buffer filler constitutes a buffer layer, which is located on one or more inner walls of the cavity in the filling area, and the buffer layer is composed of a single layer of integral material or a one-layer structure composed of a combination of multiple granular materials;

The acoustic-improving filler is filled in the filling area whose inner wall contains the buffer layer filler.

Optionally, both the buffer filler and the acoustic improvement filler are block materials;

The buffer fillers and the acoustic improvement fillers are alternately arranged; or the bulk buffer fillers and the block acoustic improvement fillers in the same layer are distributed in a matrix, and the buffer fillers and the acoustic improvement fillers are alternately arranged.

In a third aspect, an embodiment of the present application provides a method for filling the acoustic adjustment material according to the first aspect, including disposing the material 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 granular, and the buffer filler 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 buffer filler is filled into the filling area;

The acoustic adjustment material is granular, and the buffer filler and the acoustic improvement filler are mixed first, and then the mixed buffer filler and the acoustic improvement filler are filled into the filling area;

The buffer filler is first arranged on at least one wall of the filling area to form a buffer filler layer, and then the acoustic improving filler is filled into the filling area.

In a fourth aspect, an embodiment of the present application provides an electronic device, including the sound generating device described in the second aspect.

The technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

According to one embodiment of the present application, the acoustic adjustment material includes a cushioning filler and an acoustic improving filler. The buffer filler foams after being triggered to become a foam buffer filler, and the foam buffer filler provides a buffer effect on the flow and collision of the acoustic improvement filler. During the working process of the sound-generating device, the buffer filler greatly reduces the risk of crushing of the acoustic-improving filler, and improves the durability and service life of the acoustic-modulating material.

Description of drawings

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

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

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

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

4 is a schematic diagram of a foamed state of a layered acoustic adjustment material according to an embodiment of the present application.

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

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 application.

Description of reference numbers:

11-shell; 12-sound unit; 13-gap; 14-buffer filler; 15-acoustic improvement filler; 16-rear acoustic cavity.

detailed description

In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

The terms "first", "second" and the like in the description and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in sequences other than those illustrated or described herein, and distinguish between "first", "second", etc. The objects are usually of one type, and the number of objects is not limited. For example, the first object may be one or more than one. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the associated objects are in an "or" relationship.

The technical solutions disclosed in the various embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The embodiment of the present application provides an acoustic adjustment material for a sound-generating device, which includes a buffer filler 14 and an acoustic improvement filler 15. The buffer filler 14 is foamed under a triggered condition to become a foam buffer The acoustic improvement filler 15 provides a buffering effect when moving and colliding, and the foamed volume of the buffer filler 14 varies with temperature and/or foaming time. Therefore, it is possible to flexibly control the degree of cushioning of the acoustic improvement filler 15 during movement and collision by the foaming temperature and time of the cushioning filler 14 .

Optionally, within a certain temperature range, when the buffer filler 14 is foamed, the temperature increases, the damping of the buffer filler increases, and the buffer capacity of the buffer filler 14 increases.

When the sounding device is impacted by an external force, the buffer filler 14 is foamed under the condition of being triggered to become a foam buffering filler. Acoustically improve the collision rate of fillers. 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.

In addition, the buffer filler 14 forms cells after foaming. The expandable material 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 buffer filler 14 can effectively buffer the flow and collision of the acoustic improvement filler 15 . In particular, when the sound-generating device works with high power, the buffer filler 14 can effectively buffer the vibration of the acoustic adjustment material.

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 buffer filler 14 has a good shockproof effect.

In addition, the different triggering temperatures enable the buffer filler 14 to change the volume of foam, thereby adapting to different application environments, which makes the acoustic adjustment material more weather-resistant and adaptable.

The buffer filler 14 refers to a material that can foam under a set trigger condition. In the untriggered condition, the buffer packing 14 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.

Optionally, the buffer filler 14 is granular, and the physical size of the buffer filler 14 after foaming is in the range of 0.1-25 mm. Specifically, the shape of the buffer filler 14 may be spherical, quasi-spherical, rod-like, cylindrical, square or radial.

Within this size range, the cushioning filler 14 has a good cushioning effect on the acoustic improving filler 15, and the cell has a good cushioning effect.

Optionally, the buffer filler 14 has a layered structure, specifically a single layer or multiple layers, or a layered structure bonded by particles. The thickness of the buffer filler 14 after foaming is in the range of 0.01-25 mm, preferably 0.1-5mm.

Specifically, the thickness of the buffer filler 14 is moderate, and it will not block the airflow channel of the acoustic improvement filler 15, and the acoustic adjustment material has a good adsorption and desorption effect on the vibrating airflow.

Specifically, when the buffer filler 14 is layered, the fluidity of these materials is good, and the filling in the cavity is easy. When filling, the layered buffer filler 14 can be directly filled into the filling area of the rear acoustic cavity 16 of the sound generating device. Alternatively, the layered buffer filler 14 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 the acoustic improvement filler 15 is prepared into a set three-dimensional structure, and the buffer filler 14 is filled into the gaps of the three-dimensional structure.

Optionally, the density range of the buffer filler 14 after foaming is 0.01-1.2 g/mL, preferably 0.05-1 g/mL.

Specifically, when not foamed, the density of the buffer filler 14 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. After foaming, the density of the buffer filler can be preferably 0.01 g/mL, 0.04 g/mL, 0.08 g/mL, and the like. Within this range, the foam cushioning filler has good cushioning effect on the acoustic improvement filler, high structural strength and good durability.

Optionally, the buffer filler 14 includes a high molecular polymer filler and a foaming agent mixed together.

Specifically, the polymer fillers include expandable polyolefin fillers, expandable thermoplastic elastomer fillers, expandable TPEE, expandable TPU, and the like. The molecular chain of the expandable polyolefin filler contains olefin links, and the molecular structures of the olefin links include -CH2-CH2-, -CH(R)-CH2- and -CH(R)-CH(R )- at least one of wherein R is alkyl or aryl. For example, the expandable polyolefin filler is composed of ethylene, propylene, butene, pentene, hexene, polystyrene, polystyrene (ie PS), polystyrene foam (ie EPS), acrylonitrile-butadiene One or more of ethylene-styrene block copolymer (ie ABS) and styrene-butadiene-styrene block copolymer (ie SBS) are polymerized. All of the above materials can be triggered by thermal radiation to foam. And, at different trigger temperatures, the volume after foaming is different, and the volume will change with the temperature change during the application process. The type of the expandable thermoplastic elastomer filler is one or more of polyolefin thermoplastic elastomer, thermoplastic vulcanizate, thermoplastic polyurethane elastomer, thermoplastic polyester elastomer and styrene block copolymer. 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. Expandable TPEE 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.

Optionally, the blowing agent comprises a low boiling alkane.

Specifically, the low boiling point alkane has a boiling point of 30°C to 40°C. During preparation, the buffer filler and the foaming agent are mixed together in a high pressure or high temperature reaction kettle. The process of this method is simple, and the buffer filler 14 can be formed in one reaction. It is also possible to add a foaming agent to the buffer filler, so that the foaming agent penetrates into the expandable material.

The low-boiling alkane includes at least one of petroleum ether, butane, pentane, and the like. All of these materials can be volatilized under a set trigger condition, thereby forming cells inside the expandable material. 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.

Optionally, the acoustic improving filler 15 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.

Specifically, the acoustic improving filler 15 refers to a porous material capable of adsorbing and desorbing vibration 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, and the like.

Optionally, the buffer filler 14 is triggered by at least one of thermal radiation, optical radiation, and electromagnetic radiation.

Specifically, under the above radiation conditions, the foaming agent in the buffer filler 14 volatilizes and becomes larger in volume, forming cells in the expandable material, thereby enabling the foaming of the expandable material.

Under the same temperature conditions, under a certain trigger time, the volume of the buffer filler 14 can be increased to an appropriate value. If the trigger time is too short, the foaming multiple of the buffer filler 14 will be small, which will not improve the sound of the buffer filler 15. effect.

Under the same triggering time and a certain triggering temperature, the volume of the buffer filler 14 can be increased to an appropriate value, and the higher the temperature, the easier the cell rupture occurs; on the contrary, the lower the triggering temperature, the greater the foaming volume of the buffer filler 14 The smaller the value, the less the effect of buffering the acoustic-improving filler 15 is achieved.

During the light irradiation, the foaming agent in the buffer filler 14 is triggered by means of ultraviolet irradiation. When the blowing agent is heated, the volume becomes larger, thereby forming cells in the buffer filler.

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 buffer filler 14 . 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 buffer filler 14 is not limited to the above-mentioned embodiment, and those skilled in the art can select according to actual needs.

Optionally, before foaming, the buffer filler 14 accounts for 0.01%-35% of the total volume of the acoustic adjustment material, preferably 0.1%-20%; after foaming, the volume of the foam cushioning filler accounts for the total volume of the acoustic adjustment material. 0.05%-65% by volume, preferably 5%-60%.

Specifically, 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 buffer filler 14 in the acoustic adjustment material, the smaller the filling amount of the acoustic improvement filler 15 will be, and the effect of the acoustic adjustment material to adsorb and desorb the vibrating gas will be reduced; The smaller the proportion of , the buffering effect cannot be achieved.

In the above volume ratio range, although the filling amount of the acoustic improvement filler 15 is relatively reduced, the buffer filler 14 can form a channel after foaming, so that the vibrating gas can easily enter and exit the acoustic adjustment material, so the sound absorption of the acoustic adjustment material The effect is significantly improved.

Due to the buffering effect of the buffer filler 14, the acoustic improvement filler 15 has a good shape-retaining effect and good durability.

Optionally, the mass of the buffer filler 14 accounts for 0.1%-20% of the total mass of the acoustic adjustment material. Within this range, only less buffer filler 14 is required to achieve a higher filling rate in the cavity.

In addition, since the mass ratio occupied by the buffer filler 14 is relatively low, the effect of adsorbing and desorbing the vibrating gas by the acoustic adjustment material will not be affected. Preferably, the mass of the buffer filler 14 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.

Specifically, the physical foaming method refers to a method in which bubbles are generated in the buffer filler through the volatile matter of the buffer filler or the volatile matter dispersed in the buffer filler during the molding process.

For example, in the physical foaming method, an inert gas can be dissolved in the buffer filler under a set pressure, and then triggered by a decompression method to release the gas, thereby forming bubbles in the buffer filler.

Alternatively, a low-boiling alkane is first added to the buffer packing, and then triggered by heating, so as to volatilize the low-boiling alkane, thereby forming air bubbles in the buffer packing. The low-boiling alkane includes at least one of petroleum ether, butane, pentane, and the like. All of these materials can volatilize under heating conditions, thereby forming air bubbles inside the buffer filler. Multiple air bubbles form foam.

The chemical foaming method refers to: using chemical methods to generate gas to foam the buffer filler: heating the chemical foaming agent added to the buffer filler to decompose it, releasing gas and foaming. Wherein, the foaming agent may be, but not limited to, ammonium carbonate, sodium bicarbonate, ammonium chloride, urea, and the like. The above-mentioned blowing agent can be decomposed under heating to generate gas and form bubbles in the buffer filler.

Alternatively, the foam may be foamed by utilizing the gas released from the chemical reaction between the components of the buffer filler.

Under different trigger conditions, the volume of expansion is different. For example, within a certain range, the higher the trigger temperature is, the larger the volume expansion is, and the lower the trigger temperature is, the smaller the volume expansion is. The greater the concentration of the blowing agent, the greater the volume expansion; the lower the concentration of the blowing agent, the smaller the volume expansion.

Optionally, the foaming process of the buffer filler 14 includes a first foaming stage and a second foaming stage, the first foaming stage obtains the first foam buffer filler, and the second foaming stage obtains the first foaming Two foam cushion padding. The cushioning effect of the cushioning filler 14 can be flexibly controlled through the staged foaming of the cushioning filler 14 .

The volume of the buffer filler 14 after foaming varies with the foaming temperature and foaming time. Specifically, see Table 1. Within a certain temperature range, specifically 80-110° C., the buffer filler 14 increases when the temperature rises. The volume of the foamed foam increases significantly, which can reach dozens or even hundreds of times of the initial volume, and the damping of the buffer filler 14 also increases, and the buffer filler 14 can play a strong buffering effect on the acoustic improvement filler 15; Within the foaming time range, specifically 10-30 min, when the time increases, the foaming volume of the buffer filler 14 increases, the damping of the buffer filler 14 also increases, and the buffer capacity of the buffer filler 14 is also enhanced. Therefore, the degree of foaming of the buffer filler 14 can be controlled by the foaming temperature and the foaming time. In addition, the foaming temperature of the buffer filler 14 can also be lower than 80°C, such as foaming at 70°C, 60°C or lower, but the foaming volume of the buffer filler 14 is small when the temperature is low, which cannot be To achieve a good buffer effect; and the foaming time of the buffer filler 14 can also be greater than 30min, such as 1h, 2h, 3h or longer, but the foaming time is too long, on the one hand, it will consume too much equipment. , electricity and other resources, on the other hand, increases the complexity of the foaming process, so the foaming degree of the buffer filler 14 needs to be comprehensively controlled according to the foaming temperature and foaming time.

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

When the buffer filler 14 is used in the sound generating device, if the buffer filler 14 has been foamed to the maximum foamed volume, the strength of the acoustic improvement 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 passing the buffer filler 14 through the first foaming stage, and the first foam buffer filler is not foamed to the maximum foaming volume, then the buffer filler 14 is applied to the sound-generating device, and the sound-generating device will not be foamed for a long time. During high temperature use, the buffer filler 14 will undergo the second foaming stage at high temperature, and the buffer filler 14 can continue to foam at this time. After the volume of the buffer filler 14 increases, it can further buffer the acoustic improvement filler 15. The service life of the acoustic improvement filler 15 is guaranteed. Specifically, during the long-term high-frequency use of the sound-generating device, the buffer filler 14 may frequently undergo multiple high-temperature foaming processes. Therefore, the second foaming stage here not only refers to one foaming stage, but may also include multiple foaming stages. foaming stage. For example, when the sound-emitting device operates for a long time and with high power, the inside of the sound-emitting device will generate a relatively high temperature. At this time, the buffer filler 14 can be in the foaming stage. When the sound-emitting device operates for a long time and high power for many times, the buffer filler 14 It will go through multiple foaming processes.

In addition, the buffer filler 14 is generally filled into the filling area of the rear acoustic cavity when it is applied to the sound generating device. The rear acoustic cavity is used as the main space for the sound generating device to adjust the low frequency effect. The volume of the buffer filler 14 becomes larger after foaming, which will inevitably occupy a larger volume of the rear acoustic cavity, thereby affecting the low frequency effect of the sound generating device. Therefore, when filling the buffer filler 14, the buffer filler 14 can only be passed through the first foaming stage. At this time, the volume of the buffer filler 14 has been significantly increased, but the volume of the rear acoustic cavity is not occupied very much. At this time, when the acoustic improvement filler 15 is in the process of moving and colliding, the cushioning filler 14 can also provide a buffering effect; while in the actual use of the sound-generating device, when the sound-generating device is in a high temperature environment or during long-term high-power use, the acoustic The adhesive of the improvement filler 15 will be aged, and the strength of the adhesive will be greatly reduced after aging, which will cause the possibility of the acoustic improvement filler 15 colliding with each other and breaking. The volume of the buffer filler 14 will further increase after the second stage of foaming, and at the same time, the damping characteristics of the buffer filler 14 are enhanced, which can more effectively buffer the movement of the acoustic improvement filler 15, reducing or even avoiding the acoustic improvement filler 15. Damage due to collision. The aging process of the adhesive of the acoustic improvement filler 15 and the second-stage foaming process of the buffer filler 14 will continue to occur during the long-term use of the sound-emitting device, that is, the continuous second-stage foaming of the buffer filler 14 can bring about the aging of the adhesive. The sound-improving filler 15 is continuously improved and solved in order to improve the sound-producing effect and service life of the sound-producing device.

Specifically, if the buffer filler 14 does not reach the maximum foam volume after the first stage of foaming, the volume of the buffer filler 14 can be further increased after the second stage of foaming, and the damping characteristics and cushioning performance of the buffer filler 14 also further increase. In a specific embodiment, referring to Table 2, after the buffer filler 14 undergoes the first-stage foaming, the second-stage foaming is performed under the foaming conditions of 50-90° C. and 1-6h, and the buffer filler 14 The volume can also be increased several times, and the second-stage foaming process can occur many times during the use of the sound-emitting device.

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

Optionally, the physical size of the buffer filler 14 before foaming is 10% to 500% of the physical size of the acoustic improvement filler 15 , and the density of the buffer filler 14 before foaming is the density of the acoustic improvement filler 15 . 30% to 500%, the physical size of the buffer filler 14 after foaming is 100% to 800% of the physical size of the acoustic improvement filler 15, and the foamed density of the buffer filler 14 is the same as the acoustic improvement filler 15. 1% to 100% of the density.

Specifically, before foaming, the physical size of the buffer filler 14 can be comparable to the physical size of the acoustic improvement filler 15, so that the buffer filler 14 and the acoustic improvement filler 15 can be mixed evenly; it can also be that the physical size of the buffer filler 14 is larger or smaller than the acoustic size The physical size of the filler 15 is improved, which facilitates increasing the filling amount of the acoustic tuning material. After foaming, the volume of the cushioning filler 14 is significantly increased, and the density is significantly reduced, which can provide a significant cushioning effect on the acoustic-improving filler 15 when it moves and collides.

The embodiment of the present application also provides a sound-generating device, including a housing 11, a sound-generating unit 12, and an acoustic adjustment material of the sound-generating device. The interior of the housing 11 forms a cavity, and the cavity includes a rear acoustic cavity 16. The sound-generating unit 12 is arranged in the cavity, the sound-generating unit 12 is communicated with the rear acoustic cavity 16, the rear acoustic cavity 16 includes a filling area, and the acoustic adjustment material is arranged in the filling area. area.

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

Specifically, the foaming of the buffer filler 14 can provide a buffer effect on the flow and collision of the acoustic improvement 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. 1-2 , both the buffer filler 14 and the acoustic improvement filler 15 are granular materials. The buffer filler 14 and the acoustic improvement filler 15 are mixed and filled in the filling area. The buffer filler 14 and the acoustic improvement filler 15 are mixed evenly, which can effectively buffer the acoustic improvement filler 15 .

In one example, as shown in FIGS. 3-4 , both the buffer filler 14 and the acoustic improvement filler 15 are layered materials. The buffer fillers 14 and the acoustic improvement fillers 15 are alternately arranged. In this example, the cushioning filler 14 can effectively press the acoustic improvement filler 15 in the arrangement direction of the two fillers, so that the acoustic improvement filler 15 can effectively cushion.

In one example, as shown in FIG. 5 , both the buffer filler 14 and the acoustic improvement filler 15 are block materials, and the block cushion filler 14 and the block acoustic improvement filler 15 in the same layer are distributed in a matrix , and the buffer filler 14 and the acoustic improvement filler 15 are arranged alternately.

In this example, in the foamed state, the buffer filler 14 can effectively press the acoustic improvement filler 15 in all directions on the same layer, thereby effectively buffering the movement of the acoustic improvement filler 15 .

In one example, as shown in FIG. 6 , the buffer filler 14 forms a grid structure. The acoustic improvement filler 15 is filled in the gap 13 formed by the buffer filler 14 .

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 casing 11 is opened, and the grid structure is first placed in the filling area; then, the acoustic improvement filler 15 is filled in the gap 13 formed by the grid structure; next, the casing 11 is closed; finally , the buffer filler 14 is foamed by means of heat radiation or the like.

All of the above filling methods can realize the foaming of the buffer filler 14 after triggering, thereby squeezing the acoustic improvement filler 15 and forming a buffer effect.

In one example, after foaming, the volume of the buffer filler increases by a factor of 2-100. 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 buffer filler 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.

The present application also provides a method for filling the acoustic adjustment material, comprising: arranging in the filling area of the rear acoustic cavity of the sound generating device in any of the following manners:

For example, as shown in FIGS. 1-2 , the acoustic adjustment material is in the form of particles. The buffer filler 14 is first filled into the filling area, and then the acoustic improvement 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 buffer filler 14 also uses particles of different physical sizes, so that the filling rate of the acoustic modulation material in the filling area is high.

It is also possible that both the acoustic improvement filler 15 and the buffer filler 14 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 buffer filler 14 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 buffer filler 14 also uses particles of different physical sizes, so that the filling rate of the acoustic modulation material in the filling area is high.

For example, the acoustic modulation material is in granular form. The buffer filler 14 and the acoustic improvement filler 15 are mixed first, and then the mixed buffer filler 14 and the acoustic improvement filler 15 are 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 buffer filler 14 also uses particles of different physical sizes, so that the filling rate of the acoustic modulation material in the filling area is high.

For example, as shown in FIGS. 3-4 , the buffer filler 14 is firstly disposed on at least one wall of the filling area to form a buffer 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 buffer filler 14 is bonded to at least one wall of the filling area using an adhesive. The acoustic improving filler 15 is then filled into the filling zone. Under the triggering condition, the buffer filler 14 in the wall is foamed, so as to squeeze the acoustic improvement filler 15 to cushion the movement of the acoustic improvement filler 15 . The foamed buffer filler 14 has a buffering effect on the acoustic improvement filler 15 .

Optionally, buffer fillers 14 are formed on two opposite wall portions of the cavity. Under the triggering condition, the cushioning fillers 14 on the two walls are foamed, so that the acoustical improvement fillers 15 are pressed in two opposite directions, which makes the foamed cushioning fillers have a better cushioning effect on the acoustical improvement fillers 15 .

In addition, after the foaming, the cushioning filler 14 forms a cushioning effect on the opposite sides of the acoustic improving filler 15, which makes the acoustic adjustment material more durable.

Further, buffer fillers 14 are formed on all walls of the cavity. In this way, the cushioning filler 14 forms a cushioning effect in any direction of the acoustic improving filler 15, which makes the durability of the acoustic adjusting material better.

Embodiments of the present application also provide an electronic device, including the sound producing device.

Specifically, the electronic device may be, but not limited to, a mobile phone, a tablet computer, a smart watch, a game console, a learning machine, etc. The electronic device has the characteristics of good acoustic effect.

The acoustic adjustment material includes acoustic improvement filler 15 and expandable EPS filler. The material of the acoustic-improving filler 15 is zeolite. The zeolite is granular with a physical size of 0.3mm-0.5mm and a density of 0.5g/mL. The mass fraction of expandable EPS filler is 4%.

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 filling, the micro speaker module was placed in an oven and heated at 110°C for 20 minutes to foam the expandable EPS filler.

The foamed filler has a physical size of 1.4 mm and a density of 0.09 g/mL, and the volume of the foamed filler accounts for 27% of the volume of the acoustic material filling mixture.

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

The material of the acoustic adjustment material is zeolite. The zeolite is granular with a physical size of 0.3mm-0.5mm and a density of 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 .

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.

Table 3 - F0 comparison table of three miniature speaker modules

声学调节材料Acoustic conditioning material	对比例2Comparative Example 2	对比例1Comparative Example 1	实施例1Example 1
微型扬声器模组F0Micro speaker module F0	781Hz781Hz	784Hz784Hz	786Hz786Hz

It can be seen from Table 3 that the F0 difference of the three micro-speakers is very small. This shows that in this Example 1, although the foamed body occupies part of the volume in the back cavity after filling, it does not cause the adsorption and desorption effects of the acoustic adjustment material to the vibrating gas to deteriorate.

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 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.

The acoustic adjustment material includes acoustic improvement filler 15 and expandable EPS filler. The material of the acoustic-improving filler 15 is zeolite. The zeolite is granular with a physical size of 0.3mm-0.5mm and a density of 0.5g/mL. The mass fraction of expandable EPS filler is 10%.

The foamed filler has a physical size of 0.36 mm, a density of 0.1 g/mL, and the volume of the foamed filler accounts for 25% of the volume of the acoustic material filling mixture.

Table 5 - F0 comparison table of three miniature speaker modules

声学调节材料Acoustic conditioning material	对比例4Comparative Example 4	对比例3Comparative Example 3	实施例2Example 2
微型扬声器模组F0Micro speaker module F0	781Hz781Hz	783Hz783Hz	785Hz785Hz

It can be seen from Table 5 that the difference in F0 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 cause the adsorption and desorption effects of the acoustic adjustment material to the vibrating gas to deteriorate.

Table 6 - Reliability comparison table of two miniature speaker modules

Before reliability test

After reliability test

△F0 change

Acoustic conditioning material

	的F0F0	的F0F0		颗粒状态particle state
对比例4Comparative Example 4	781Hz781Hz	918Hz918Hz	137Hz137Hz	颗粒严重破碎Severely broken particles
实施例2Example 2	785Hz785Hz	791Hz791Hz	6Hz6Hz	无变化no change

It can be seen from Table 6 that after the reliability test, the F0 of the micro-speaker module of Example 2 changes by 6 Hz, while the F0 of the micro-speaker module of Comparative Example 4 changes by 137 Hz.

This shows that since the particles of the acoustic adjustment material have no 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 4.

The acoustic adjustment material includes acoustic improvement filler 15 and expandable EPS filler. Wherein, the material of the acoustic improvement filler 15 is molecular sieve. Molecular sieves are granular, with a physical size of 0.3mm-0.5mm and a density of 0.5g/mL. The mass fraction of expandable EPS filler is 1.7%.

After foaming, the physical size of the foamed filler becomes 20 mm, the density is 0.07 g/mL, and the volume of the foamed filler accounts for 55% of the volume of the acoustic material filling mixture.

The material of the acoustic adjustment material is molecular sieve. Molecular sieves are granular, with a physical size of 0.3mm-0.5mm and a density of 0.5g/mL.

Table 7 - F0 comparison table of three miniature speaker modules

声学调节材料Acoustic conditioning material	对比例6Comparative Example 6	对比例5Comparative Example 5	实施例3Example 3
微型扬声器模组F0Micro speaker module F0	781Hz781Hz	785Hz785Hz	786Hz786Hz

It can be seen from Table 7 that the F0 of the speaker of Example 3 is basically the same as that of Comparative Example 5 and Comparative Example 6. This shows that, although the foam filler occupies part of the volume in the back cavity in this Example 3, it does not cause the adsorption and desorption effects of the acoustic adjustment material to the vibrating gas to deteriorate.

Table 8 - Reliability comparison table of two miniature speaker modules

It can be seen from Table 8 that after the reliability test, the F0 of the micro-speaker module of Example 3 changes little, and the particle state does not change. On the other hand, the F0 of the micro speaker module of Comparative Example 6 increased significantly, and the particles were severely broken.

This shows that the reliability of the acoustic adjustment material used in this example is significantly better than that of the acoustic adjustment material used in Comparative Example 6 because the particles of the acoustic adjustment material are unchanged.

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.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of this application, without departing from the scope of protection of the purpose of this application and the claims, many forms can be made, which all fall within the protection of this application.

Claims

An acoustic adjustment material for a sound-generating device, characterized in that it comprises:

A buffer filler and an acoustic improvement filler, the buffer filler foams under the condition of being triggered to become a foam buffer filler, so as to provide a buffer effect for the acoustic improvement filler when moving and collided, and the foamed buffer filler is foamed. Volume varies with temperature and/or foaming time.
The acoustic adjustment material according to claim 1, characterized in that, in the foaming process, when the temperature increases, the damping of the buffer filler increases, and the buffer capacity of the buffer filler increases.
The acoustic adjustment material according to claim 1, wherein the buffer filler is granular, and the physical size of the buffer filler after foaming is in the range of 0.1-25 mm.
The acoustic adjustment material according to claim 1, wherein the buffer filler is layered, and the thickness of the buffer filler after foaming is in the range of 0.01-5 mm.
The acoustic adjustment material according to claim 1, wherein the foamed buffer filler has a density ranging from 0.01 to 1.2 g/mL.
The acoustic adjustment material according to claim 1, wherein the buffer filler comprises a high molecular polymer filler and a foaming agent mixed together.
The acoustic adjustment material according to claim 1, wherein the buffer filler is triggered by at least one of thermal radiation, optical radiation, and electromagnetic radiation.
The acoustic adjustment material according to claim 1, wherein, before foaming, the buffer filler accounts for 0.01%-35% of the total volume of the acoustic adjustment material; after foaming, the volume of the foam cushion filler accounts for the volume of the acoustic adjustment material. 0.05%-65% of the total volume of the material.
The acoustic adjustment material according to claim 1, wherein the buffer filler is triggered by a physical foaming method or a chemical foaming method.
The acoustic adjustment material according to claim 1, wherein the volume of the foam buffer filler is 2-200 times the volume of the buffer filler.
The acoustic adjustment material according to claim 1, wherein the physical size of the buffer filler before foaming is 10% to 500% of the physical size of the acoustic improvement filler, and the physical size of the buffer filler after foaming It is 100% to 800% of the physical size of the acoustic improvement filler.
The acoustic adjustment material according to claim 1, wherein the foaming process of the buffer filler includes a first foaming stage and a second foaming stage, and the first foaming stage obtains a first foam buffer filler , and the second foam buffer filler is obtained in the second foaming stage.
The acoustic adjustment material according to claim 12, wherein the volume of the second foam buffer filler is 1-25 times the volume of the first foam buffer filler.
A sound-generating device, characterized in that it comprises a housing, a sound-generating unit, and an acoustic adjustment material of the sound-generating device according to any one of claims 1-13, the interior of the housing forms a cavity, and the The cavity includes 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 area.
The sound-generating device according to claim 14, wherein, before foaming, the filling rate of the acoustic adjustment material in the filling area is 50%-95%.
The sound generating device according to claim 14, wherein the buffer filler and the acoustic improvement filler are both granular materials, and the buffer filler and the acoustic improvement filler are mixed and filled in the filling area.
The sound-generating device according to claim 14, wherein the buffer filler constitutes a buffer layer, which is located on one or more inner walls of the cavity of the filling area, and the buffer layer is composed of a single layer of integral material or a plurality of granular materials A layered structure composed of combinations;

The acoustic-improving filler is filled in the filling area whose inner wall contains the buffer layer filler.
The sound-generating device according to claim 14, wherein the buffer filler and the acoustic improvement filler are both block materials, and the buffer filler and the acoustic improvement filler are alternately arranged; or, blocks in the same layer The shaped buffer fillers and the block-shaped acoustically improved fillers are distributed in a matrix, and the buffered fillers and the acoustically improved fillers are staggered.
A method for filling the acoustic adjustment material according to any one of claims 1 to 13, characterized in that it comprises setting 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 granular, and the buffer filler 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 buffer filler is filled into the filling area;

The acoustic adjustment material is granular, and the buffer filler and the acoustic improvement filler are mixed first, and then the mixed buffer filler and the acoustic improvement filler are filled into the filling area;

The buffer filler is first arranged on at least one wall of the filling area to form a buffer filler layer, and then the acoustic improving filler is filled into the filling area.
An electronic device, characterized in that it comprises the sound producing device according to any one of claims 14-18.