CN111534017A

CN111534017A - Acoustic adjusting material, sound production device, filling method, and electronic device

Info

Publication number: CN111534017A
Application number: CN202010659930.3A
Authority: CN
Inventors: 潘泉泉; 凌风光; 李春; 张成飞; 刘春发
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2020-08-14
Also published as: WO2022007336A1

Abstract

The embodiment of the application provides an acoustic adjusting material, a sound production device, a filling method and electronic equipment, wherein the acoustic adjusting material comprises an expandable buffering filler and an acoustic improvement filler, the expandable buffering filler is foamed under a triggered condition to form a foam buffering filler so as to provide a buffering effect for the acoustic improvement filler when the acoustic improvement filler is moved and collided, and the volume of the expanded expandable buffering filler is changed along with the change of temperature and/or foaming time. The embodiment of the application flexibly controls the buffering degree of the acoustic improvement filler when the acoustic improvement filler is in moving collision through the foaming temperature and time of the expandable buffering filler. In the working process of the sound generating device, the expandable buffering filler greatly reduces the risk of improving filler crushing by acoustics, and improves the durability and the service life of the acoustic adjusting material.

Description

Acoustic adjusting material, sound production device, filling method, and electronic device

Technical Field

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

Background

A sound generating device, such as a receiver or a speaker, generally includes a housing, and a sound generating unit accommodated in the housing. The sound production monomer divides the cavity in the shell into a front sound cavity and a rear sound cavity. The front sound cavity is communicated with the sound outlet, and sound waves generated by the sound generating monomer are radiated from the front sound cavity. The back sound cavity is communicated with the sound production monomer. The vibrating air flow on the opposite side of the sound wave can radiate into the rear sound cavity. The back sound cavity is used for adjusting the low-frequency effect of the sound generating device.

For better tuning of the low frequency effect, the rear sound cavity is typically filled with sound absorbing particles. Inhale the sound granule can adsorb, desorption vibration gas to make sound generating mechanism's low frequency effect better. However, during operation, the sound-absorbing particles may collide with each other, resulting in breakage. On the one hand, the breakage can produce the dust, and the dust gets into the sound production monomer, can cause the sound production monomer abnormal operation. On the other hand, sound absorbing particle breakage will raise the F0 of the sound generating device, causing the low frequency effect to be poor.

Chinese utility model patent application No. 201921855579.4 discloses a filler for speaker, this filler includes expandable filler and acoustics filler, and wherein expandable filler can be when the inflation triggers from first size permanent inflation to second size, plays the fixed action to acoustics filler, has improved the sound quality of speaker equidirectional not, has avoided the production of flowing to make an uproar. However, the expandable filler of the application is permanently expanded from an initial first size to a fixed second size when the expansion is triggered, the expandable filler is not changed under the condition of the second size, and the size of the expandable filler is constant in the using process of the loudspeaker, so that the expansion degree of the expandable filler cannot be effectively adjusted according to different loudspeaker using environment conditions, and the applicability of the expandable filler is limited.

Disclosure of Invention

The embodiment of the application provides an acoustic adjusting material, a sound generating device, a filling method and electronic equipment, and aims to solve the problem that the existing acoustic adjusting material is low in applicability.

In order to solve the above problem, the following technical solutions are adopted in the embodiments of the present application:

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

the acoustic improvement filler is foamed under a triggered condition to form a foam buffer filler so as to provide a buffer effect for the acoustic improvement filler during moving collision, the foamed volume of the expandable buffer filler is changed along with the change of temperature and/or foaming time, the damping of the expandable buffer filler is increased when the temperature is increased and/or the time is increased, and the buffer capacity of the expandable buffer filler is enhanced;

the expandable buffering filler and the acoustic improving filler constitute composite particles.

Optionally, the expandable buffering filler and the acoustic improvement filler are both granular materials, and the expandable buffering filler and the acoustic improvement filler are bonded to form the composite particles.

Optionally, the expandable buffering filler and the acoustic improvement filler are both particulate materials, and a plurality of the acoustic improvement filler is bonded around the expandable buffering filler.

Optionally, the expandable buffering filler and the acoustic improvement filler are both particulate materials, and the acoustic improvement filler is wrapped around the expandable buffering filler.

Optionally, the physical size of the expandable buffering filler after foaming is 0.1mm-25 mm.

Optionally, the density of the expandable buffering filler after foaming is in a range of 0.01-2 g/mL.

Optionally, the expandable buffering filler comprises a high molecular polymer filler and a blowing agent mixed together.

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

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

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

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

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

Optionally, the foaming process of the expandable cushion filler includes a first foaming stage and a second foaming stage, the first foaming stage obtains a first foam cushion filler, and the second foaming stage obtains a second foam cushion filler.

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

In a second aspect, the embodiment of the application provides a sound generating device, including casing, sound production monomer and first aspect the acoustics adjust the material, the inside formation cavity of casing, the cavity includes back sound cavity, sound production monomer sets up in the cavity, sound production monomer with back sound cavity intercommunication, back sound cavity includes the filling district, the acoustics adjusts the material setting and is in the filling district.

Optionally, the acoustic conditioning material has a fill rate of 50% -95% in the filling zone prior to foaming.

In a third aspect, the present invention provides a method for filling an acoustic conditioning material of a sound generating device, including the acoustic conditioning material of the first aspect, the acoustic conditioning material is disposed in a filling area of a rear sound cavity of the sound generating device in the following manner:

combining the expandable buffering filler and the acoustic improvement filler into composite particles;

filling the filling zone with composite particles.

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

The technical scheme adopted by the embodiment of the application can achieve the following beneficial effects:

the embodiment of the application provides an acoustic adjusting material for a sound generating device, including expandable buffering filler and acoustics improvement filler, expandable buffering filler foams under the condition of being triggered, becomes foam buffering filler, and is right acoustics improvement filler provides the cushioning effect when removing the collision, the volume after the foaming of expandable buffering filler changes along with the change of temperature and foaming time. The embodiment of the application controls the buffer degree of the acoustic improvement filler when the acoustic improvement filler is in moving collision through the foaming temperature and time of the expandable buffer filler.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of an acoustic conditioning material for a sound generating device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another acoustic conditioning material for a sound generating device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of another acoustic conditioning material for a sound production device according to an embodiment of the present application.

Description of reference numerals:

11-a housing; 12-a sound generating monomer; 13-the posterior acoustic chamber; 14-expandable buffer filler; 15-acoustically improving filler.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

Technical solutions disclosed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 3, the present embodiment provides an acoustic conditioning material for a sound generating device, including an expandable buffering filler 14 and an acoustic improvement filler 15, where the expandable buffering filler 14 is foamed under a triggered condition to form a foam buffering filler to provide a buffering effect to the acoustic improvement filler 15 when the foam buffering filler 15 is in a moving collision, and the volume of the expanded expandable buffering filler 14 changes with the change of temperature and/or foaming time. In a certain temperature and time range, when the expandable buffering filler 14 is foamed, the damping of the expandable buffering filler is increased when the temperature is increased and/or the time is increased, the buffering capacity of the expandable buffering filler 14 is enhanced, the expandable buffering filler 14 and the acoustic improvement filler 15 constitute composite particles, and the expandable buffering filler 14 and the acoustic improvement filler 15 may be specifically spherical, spheroidal, rod-like, cylindrical, square or radial.

When the sounding device is impacted by external force, the expandable buffering filler 14 foams under the condition of being triggered to form foam buffering filler, the foam buffering filler provides buffering force for the flowing and collision of the acoustic improvement filler, and the collision rate of the acoustic improvement filler is reduced in the working process of the sounding device. In this way, the risk of breaking the acoustic improvement filler is greatly reduced, and the durability and the service life of the acoustic adjusting material are improved.

In addition, the expandable cushioning filler 14 forms cells after foaming. The expandable material has elasticity, and the cells can change volume according to the change of the external pressure, thereby providing a buffering action to the movement of the acoustic improving filler 15. In this way, expandable cushion filler 14 can effectively cushion the flow and collision of acoustic improvement filler 15. In particular, the expandable cushioning filler 14 effectively damps the vibrations of the acoustic tuning material when the sound generating device is operated at high power.

In addition, when the sound generating device is impacted by external force, the cells provide buffering force for the acoustic improvement filler 15, and gas in the cells is subjected to stagnation and compression, so that external energy is consumed and dissipated. The cells gradually terminate the impact load at a small negative acceleration, and therefore, the expandable cushioning filler 14 has a good shock-proof effect.

In addition, the different triggering temperatures enable the expandable buffering filler 14 to change the volume of foaming so as to adapt to different application environments, and therefore the acoustic adjusting material is higher in weather resistance and adaptability.

Expandable cushion filler 14 refers to a material that is capable of foaming under a set trigger condition. In the non-triggered condition, expandable cushioning filler 14 has a smaller volume. This allows the material to be easily filled into a defined cavity, for example the filling area of the rear acoustic cavity. The material foams under a triggered condition, thereby providing cushioning for the acoustically improved padding when impacted.

Optionally, the expandable buffering filler 14 and the acoustic improvement filler 15 are both granular materials, specifically, may be spherical or block-shaped particles, and the expandable buffering filler 14 and the acoustic improvement filler 15 are bonded to form the composite particles. Referring to fig. 1, both of the expandable buffering filler 14 and the acoustic improvement filler 15 are block structures, and the expandable buffering filler 14 and the acoustic improvement filler 15 are bonded to form the composite particles, so that the expandable buffering filler 14 can well buffer the movement of the acoustic improvement filler 15.

Alternatively, both the expandable cushioning filler 14 and the acoustic improvement filler 15 are particulate materials, specifically, spherical or massive particles, and a plurality of the acoustic improvement fillers are bonded around the expandable cushioning filler. Referring to fig. 2, both the expandable buffering filler 14 and the acoustic improvement filler 15 are spherical structures, a plurality of acoustic improvement fillers 15 are bonded around the expandable buffering filler 14 to form the composite particles, and the expandable buffering filler 14 and the acoustic improvement filler 15 are uniformly distributed, so that the movement of the acoustic improvement filler 15 can be well buffered.

Optionally, the expandable buffering filler and the acoustic improvement filler are both granular materials, and may be spherical or blocky particles, and the acoustic improvement filler is wrapped around the expandable buffering filler. Referring to fig. 3, the expandable buffering filler 14 is a spherical structure, the acoustic improvement filler 15 is coated around the expandable buffering filler 14 to form the composite particles, the expandable buffering filler 14 is disposed outside the acoustic improvement filler 15 to achieve a good sound effect, and the expandable buffering filler 14 can buffer the movement of the acoustic improvement filler 15 well.

Optionally, the physical size of the expandable buffering filler 14 after foaming is 0.1mm to 25 mm.

Specifically, in this size range, the cushioning effect of the expandable cushioning filler 14 on the acoustic improving filler 15 is good, and the cushioning effect of the cells is good. In addition, the thickness of the expandable buffering filler 14 is moderate, the airflow channel of the acoustic improvement filler 15 cannot be blocked, and the adsorption and desorption effects of the acoustic adjusting material on the vibration airflow are good.

Further, the physical size of the expandable buffering filler 14 after the expansion is 0.5mm to 2 mm. In this range, the cushioning effect of the acoustic improving filler by the cells formed by the expandable cushioning filler 14 is more excellent.

In particular, when the expandable cushioning filler 14 is in a layered form, these materials have good fluidity and are easily filled in the cavity. During filling, the layered expandable cushioning filler 14 can be filled directly into the filling region of the rear sound chamber 13 of the sound generating device. Alternatively, the layered expandable cushioning filler 14 may be prepared into a predetermined shape and then filled into the filling region of the rear sound cavity 13 of the sound generating device. It is also possible that the acoustic improving filler 15 is prepared in a set three-dimensional structure, and the expandable buffering filler 14 is filled in the gaps of the three-dimensional structure.

Optionally, the density of the expandable buffering filler 14 after foaming ranges from 0.01 to 1.2g/mL, preferably from 0.05 to 1 g/mL.

Specifically, expandable buffering filler 14 has a density of 0.2g/mL to 1.5g/mL when unfoamed. In this density range, the density of the entirety of the acoustic conditioning material is small, which makes the weight of the entirety of the sound emitting device light. After foaming, the density of the expandable buffering filler can be preferably selected from 0.01g/mL, 0.04g/mL, 0.08g/mL, etc. Within this range, the foam cushion filler has a good cushioning effect on the acoustic improvement filler, high structural strength, and good durability.

Optionally, the expandable cushioning filler 14 includes a high molecular polymer filler and a blowing agent mixed together.

Specifically, the high molecular polymer filler includes an expandable polyolefin filler, an expandable thermoplastic elastomer filler, an expandable TPEE, an expandable TPU, and the like. The molecular chain of the expandable polyolefin filler contains olefin chain units, and the molecular structure of the olefin chain units comprises at least one of-CH 2-CH2-, -CH (R) -CH 2-and-CH (R) -wherein R is alkyl or aromatic. For example, the expandable polyolefin filler is polymerized from one or more of ethylene, propylene, butylene, pentene, hexene, polystyrene (i.e., PS), polystyrene foam (i.e., EPS), acrylonitrile-butadiene-styrene block copolymer (i.e., ABS), and styrene-butadiene-styrene block copolymer (i.e., SBS). The materials can be triggered under the condition of heat radiation, so that the foaming is realized. And, under different trigger temperatures, the foamed volume is different, and changes with the temperature change in the application process. 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. The materials can be triggered under the condition of heat radiation, so that the foaming is realized. And, under different trigger temperatures, the foamed volume is different, and changes with the temperature change in the application process. The expandable TPEE filler has the characteristics of light weight, no water absorption, aging resistance, strong corrosion performance, strong toughness, no toxicity and no pollution.

The kind, amount and the like of the foaming agent can be selected by those skilled in the art according to actual needs.

Optionally, the blowing agent comprises a low boiling alkane.

Specifically, the low boiling point alkanes have a boiling point of 30 ℃ to 40 ℃. During preparation, the foaming buffer filler and the foaming agent are mixed together in a high-pressure or high-temperature reaction kettle to prepare the foaming material. The method has simple process, and the expandable buffering filler 14 can be formed by one-time reaction. It is also possible to add a foaming agent to the expandable cushioning filler, so that the foaming agent penetrates into the expandable material.

The low boiling alkane includes at least one of petroleum ether, butane, pentane, etc. These materials are all capable of volatilizing under a set trigger condition to form cells within the interior of the expandable material. The plurality of cells form a foam. Of course, the kind of the foaming agent is not limited to the above examples, and those skilled in the art can select the foaming agent according to actual needs.

Optionally, the acoustic improvement filler 15 is a material with acoustic properties made of one or more of activated carbon, zeolite powder, silica, porous alumina, molecular sieves, metal-organic framework materials.

Specifically, the acoustic improving filler 15 refers to a porous material capable of adsorbing and desorbing the vibration gas. For example, the acoustic adjusting material includes an acoustic performance material made of one or more of activated carbon, zeolite powder, silica, porous alumina, molecular sieve, metal-organic framework material, and the like. The acoustic improvement filler 15 may be in the form of particles, flakes, blocks, or the like.

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

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

Under the same temperature condition, the volume of the expandable buffering filler 14 can be increased to an appropriate value under a certain trigger time, and if the trigger time is too short, the foaming times of the expandable buffering filler 14 are small, so that the expandable buffering filler can not play a role in buffering the acoustic improvement filler 15.

At the same trigger time and at a certain trigger temperature, the volume of the expandable buffer filler 14 can be increased to an appropriate value, and the higher the temperature is, the more easily the cell breakage occurs; conversely, the lower the trigger temperature, the smaller the foaming volume of the expandable buffering filler 14, and the less the function of the buffering-sound improving filler 15.

The foaming agent in the expandable buffer charge 14 is triggered by means of ultraviolet radiation during the irradiation with light. The foaming agent becomes larger in volume under the heated condition, so that cells are formed in the expandable buffering filler.

When electromagnetic radiation is applied, the acoustic conditioning material is heated under the influence of the alternating magnetic field. The foaming agent volatilizes, forming cells within expandable buffer filler 14. The triggering mode is simple to operate, and the controllability of the size of the foam holes is strong.

Of course, the triggering mode of the expandable buffering filler 14 is not limited to the above-mentioned embodiment, and those skilled in the art can select the triggering mode according to actual needs.

Optionally, before foaming, said expandable buffering filler 14 represents 0.01% to 35%, preferably 0.1% to 20%, of the total volume of the acoustic conditioning material; after foaming, the volume of the foam cushion filler is 0.05% to 65%, preferably 5% to 60%, of the total volume of the acoustic conditioning material.

Specifically, before foaming, the proportion of the acoustic improvement filler is large in the above proportion range, and the acoustic improvement filler can be uniformly dispersed in the cavity. The larger the proportion of the expandable buffering filler 14 in the acoustic adjusting material is, the smaller the filling amount of the acoustic improving filler 15 is, and the effects of adsorption and desorption of vibrating gas of the acoustic adjusting material are reduced; conversely, the smaller the proportion of the expandable buffering filler 14 in the acoustic adjusting material, the less the effect of buffering is exerted.

In the above-mentioned volume ratio range, although the filling amount of the acoustic improvement filler 15 is relatively reduced, the expandable buffering filler 14 can form channels after foaming, so that the vibration gas can easily enter and exit the acoustic adjusting material, and the sound absorbing effect of the acoustic adjusting material is remarkably improved.

The shape retention of the acoustic improving filler 15 is good and the durability is good due to the cushioning effect of the expandable buffering filler 14.

Optionally, the mass of the expandable buffering filler 14 accounts for 0.1% -20% of the total mass of the acoustic adjusting material. Within this range, a higher filling rate in the cavity can be achieved with less expandable cushioning filler 14.

In addition, the mass ratio of the expandable buffering filler 14 is low, so that the effect of the acoustic adjusting material on adsorbing and desorbing the vibrating gas is not affected. Preferably, expandable buffering filler 14 comprises 1% to 5% by mass of the total mass of the acoustic adjusting material. Within this range, the acoustic adjusting material has good durability and good effects of adsorbing and desorbing the vibrating gas.

Specifically, the physical foaming method means: a method for foaming an expandable buffering filler by volatile components of the expandable buffering filler or volatile components dispersed in the expandable buffering filler during molding.

For example, the physical foaming method may be that inert gas is first dissolved in the expandable buffering filler under a set pressure, and then triggered by a pressure reduction manner to release gas, so as to form bubbles in the expandable buffering filler.

Alternatively, the low-boiling alkane may be added to the expandable buffering filler, and then triggered by heating to volatilize the low-boiling alkane, thereby forming bubbles in the expandable buffering filler. The low boiling alkane includes at least one of petroleum ether, butane, pentane, etc. These materials are all capable of volatilizing under the conditions of heat, thereby forming bubbles inside the expandable buffering filler. The plurality of bubbles forms a foam.

The chemical foaming method is as follows: foaming of the expandable cushioning filler by means of the chemical generation of gas: the chemical foaming agent added into the expandable buffering filler is heated to be decomposed, and gas is released to foam. Among them, the foaming agent may be, but not limited to, ammonium carbonate, sodium bicarbonate, ammonium chloride, urea, and the like. The foaming agent is capable of decomposing under heating to generate gas, forming bubbles in the expandable cushioning filler.

It may also be foamed by means of gases released by chemical reactions between the components of the expandable buffering filler.

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

Optionally, the foaming process of the expandable cushion filler 14 includes a first foaming stage resulting in a first foam cushion filler and a second foaming stage resulting in a second foam cushion filler. The cushioning effect of the expandable cushioning filler 14 can be flexibly controlled by the stage foaming of the expandable cushioning filler 14.

The volume of the foamed buffering filler 14 changes with the change of the foaming temperature and the foaming time, specifically, referring to table 1, the foaming volume of the foamed buffering filler 14 is significantly increased when the temperature rises within a certain temperature range, specifically 80 to 110 ℃, and can reach dozens of times or even hundreds of times of the initial volume, the damping of the foamed buffering filler 14 is increased accordingly, and the foamed buffering filler 14 can play a powerful buffering role in the acoustic improvement filler 15; within a certain foaming time range, specifically 10-30min, the foaming volume of the expandable buffering filler 14 is increased when the time is increased, the damping of the expandable buffering filler 14 is increased, and the buffering capacity of the expandable buffering filler 14 is enhanced at the same time. Therefore, the degree of foaming of expandable cushion filler 14 can be controlled by the foaming temperature and time. In addition, the foaming temperature of the expandable buffering filler 14 may also be lower than 80 ℃, for example, the foaming is performed at 70 ℃, 60 ℃ or lower, but the foaming volume of the expandable buffering filler 14 is smaller at lower temperature, and a good buffering effect cannot be achieved; the foaming time of the expandable buffering filler 14 may also be longer than 30min, for example, 1h, 2h, 3h or longer, but too long foaming time may consume too many resources such as equipment and power, and increase the complexity of the foaming process, so the foaming degree of the expandable buffering filler 14 needs to be comprehensively controlled according to the foaming temperature and the foaming time.

TABLE 1 volume as a function of temperature data for the first foaming stage of expandable materials

When the expandable cushion filler 14 is applied to a sound-emitting device, if the expandable cushion filler 14 has been expanded to the maximum expanded volume, the strength of the acoustic improvement filler 15 may be weakened during long-term use at high temperature, and there is still a risk of breakage. If the expandable buffering filler 14 is subjected to the first foaming stage to obtain the first foam buffering filler, the first foam buffering filler is not foamed to the maximum foaming volume, at the moment, the expandable buffering filler 14 is applied to the sound generating device, the expandable buffering filler 14 can be subjected to the second foaming stage at high temperature in the long-term high-temperature use process of the sound generating device, at the moment, the expandable buffering filler 14 can be foamed continuously, the acoustic improvement filler 15 can be further buffered after the volume of the expandable buffering filler 14 is increased, and the service life of the acoustic improvement filler 15 is ensured. Specifically, the expandable cushioning filler 14 may frequently undergo a plurality of high-temperature foaming processes during long-term high-frequency use of the sound generating apparatus, and therefore, the second foaming stage herein may refer to not only one foaming stage but also a plurality of foaming stages. For example, when the sound generating device is operated for a long time and at a high power, the interior of the sound generating device generates a high temperature, and at this time, the foamable buffer filler 14 can be subjected to a foaming stage, and when the sound generating device is operated for a long time and at a high power for multiple times, the foamable buffer filler 14 can undergo multiple foaming processes.

In addition, the expandable cushioning filler 14, when used in a sound generating device, is typically filled into the filling area of the rear acoustic chamber. Then the sound chamber adjusts the primary space of low frequency effect as sound generating mechanism, and expandable buffering filler 14 volume grow after the foaming can occupy the great volume of back sound chamber certainly, and then influences sound generating mechanism's low frequency effect. It is possible to only pass the expandable cushion 14 through the first foaming stage when filling the expandable cushion 14, when the volume of the expandable cushion 14 has increased significantly, without causing a very large occupation of the volume of the rear acoustic chamber. Expandable cushioning filler 14 may also provide cushioning during a moving impact of acoustically improving filler 15; and in the in-service use process of sound generating mechanism, locate under high temperature environment or long-term high power use when sound generating mechanism, the adhesive that acoustics improved filler 15 can take place ageing, intensity greatly reduced after the adhesive ages, will cause acoustics to improve filler 15 collision and broken possibility each other, expandable buffer filler 14 can carry out the second stage foaming under the inside environment that produces the high temperature of sound generating mechanism at this moment, expandable buffer filler 14 experiences the foaming back volume of second stage and can further increase, simultaneously expandable buffer filler 14's damping characteristic reinforcing, can play the cushioning effect to the motion that acoustics improved filler 15 more effectively, reduce and avoid acoustics to improve filler 15 because the damage that the collision brought even. The aging process of the adhesive of the acoustic improvement filler 15 and the second-stage foaming process of the expandable buffering filler 14 can continuously occur in the long-term use process of the sound generating device, namely the continuous second-stage foaming of the expandable buffering filler 14 can continuously improve and solve the collision and breakage problem of the acoustic improvement filler 15 caused by the aging of the adhesive, so that the sound generating effect of the sound generating device is improved, and the service life of the sound generating device is prolonged.

Specifically, after the expandable buffering filler 14 is foamed in the first stage, if the maximum foaming volume is not reached, the volume of the expandable buffering filler 14 after the second stage foaming is continued can be further increased, and the damping characteristic and the buffering performance of the expandable buffering filler 14 are further increased. In one specific embodiment, referring to Table 2, after the expandable cushioning filler 14 undergoes the first stage foaming, and then undergoes the second stage foaming at 80-100 ℃ for 1-6 hours, the volume of the expandable cushioning filler 14 can be increased by several times, and the second stage foaming process can occur several times during the use of the sound generating apparatus.

TABLE 2 volume as a function of temperature data for the second foaming stage of the expandable Material

The embodiment of the application still provides a sound generating mechanism, including casing 11, sound production monomer 12 and sound generating mechanism's acoustics adjusting material, casing 11's inside formation cavity, the cavity includes back vocal cavity 13, sound production monomer 12 sets up in the cavity, sound production monomer 12 with back vocal cavity 13 intercommunication, back vocal cavity 13 includes the filling district, acoustics adjusting material sets up in the filling district.

The sound production device has the characteristics of good sound production effect, good low-frequency effect and good durability.

Specifically, with the foaming of the expandable cushioning filler 14, it is possible to provide a cushioning effect on the flow, impact of the acoustically improved filler. Preferably, the filling rate of the acoustic conditioning material in the filling zone is 60% to 85% in the non-triggered condition. Within the range, after being triggered, the acoustic adjusting material can better play a buffering role, can provide buffering for the flowing and collision of the acoustic improving filler, and prevents the acoustic improving filler from being broken.

Specifically, referring to fig. 1, the expandable buffering filler 14 and the acoustic improvement filler 15 are both block structures, the expandable buffering filler 14 and the acoustic improvement filler 15 are bonded to form the composite particles, the composite particles are contained in the filling area, the expandable buffering filler 14 and the acoustic improvement filler 15 are uniformly distributed in the filling area, and the expandable buffering filler 14 can well buffer the movement of the acoustic improvement filler 15.

Specifically, referring to fig. 2, the expandable buffering filler 14 and the acoustic improvement filler 15 are both spherical structures, a plurality of acoustic improvement fillers 15 are bonded around the expandable buffering filler 14 to form the composite particles, the composite particles are accommodated in the filling region, the expandable buffering filler 14 and the acoustic improvement filler 15 are uniformly distributed in the filling region, and the expandable buffering filler 14 can well buffer the movement of the acoustic improvement filler 15.

Specifically, referring to fig. 3, the expandable buffering filler 14 is a spherical structure, the acoustic improvement filler 15 is coated around the expandable buffering filler 14 to form the composite particles, the composite particles are contained in the filling region, the expandable buffering filler 14 is disposed outside the acoustic improvement filler 15 to achieve a good sound effect, the expandable buffering filler 14 and the acoustic improvement filler 15 are uniformly distributed in the filling region, and the expandable buffering filler 14 can buffer the movement of the acoustic improvement filler 15 well.

The application also provides a filling method of the acoustic adjusting material, which comprises the following steps of arranging the acoustic adjusting material in a filling area of a rear sound cavity of the sound generating device:

combining the expandable buffering filler 14 and the acoustic improving filler 15 into composite particles;

filling the filling zone with composite particles.

Specifically, the housing 11 is provided with a filling hole. During filling, the granules are filled from the filling opening into the filling area. It is possible to use particles of different physical sizes for the composite particles, so that the filling rate of the acoustic conditioning material in the filling zone is high. Alternatively, the composite particles may be all particles of the same physical size to ensure the consistency of the acoustic conditioning material.

The embodiment of the application also provides electronic equipment, which comprises the sound generating device.

Specifically, the electronic device may be, but is not limited to, a mobile phone, a tablet computer, a smart watch, a game machine, a learning machine, and the like, and the electronic device has a characteristic of good acoustic effect.

< example 1>

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

The sound generating device is a micro speaker module. The volume of the rear acoustic chamber 13 of the micro-speaker module is 0.4 cc. The acoustic conditioning material is mixed and filled into the rear acoustic cavity 13.

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

The foamed filler had a physical size of 1.4mm and a density of 0.09g/mL, and the volume of the foamed filler was 27% of the volume of the acoustic material-filled mixture.

< comparative example 1>

In this example, the acoustic conditioning material and speaker module are consistent with the embodiments. Wherein the expandable EPS filler is not triggered.

< comparative example 2>

The material of the acoustic adjusting material is zeolite. The zeolite is in the form of granules with a physical size of 0.3mm-0.5mm and a density of 0.5 g/mL.

The sound generating device is a micro speaker module. The module is the same as the module used in the embodiment. Acoustic conditioning material is potted into the rear acoustic chamber 13.

< test items >

1. F0 test: and respectively testing the frequency response curves of the three micro loudspeaker modules, and acquiring F0 of the three micro loudspeaker modules.

2. And (3) reliability testing: at the same power, three micro-speaker modules operated for 100 hours. Then, the F0 for the three micro-speaker modules was tested again.

After the test was completed, the acoustic conditioning material of the three micro-speaker modules was removed and the particle integrity of the acoustically improved filler 15 was observed.

< test results >

Table 3-comparative table of F0 for three micro speaker modules

Acoustic conditioning material	Comparative example 2	Comparative example 1	Example 1
				Micro speaker module F0	781 Hz	784 Hz	786 Hz

As can be seen from table 3, the F0 differences for the three micro-speakers are small. This indicates that in example 1, although the foam filler occupies a partial volume of the rear cavity, the adsorption and desorption effects of the acoustic control material on the vibration gas are not deteriorated.

TABLE 4-reliability comparison table for two micro speaker modules

	F0 before reliability test	F0 after reliability test	△ F0 variation	Acoustically modifying material particle state
					Comparative example 2	781 Hz	918 Hz	137 Hz	Severe particle breakage
Example 1	786 Hz	792 Hz	6 Hz	Without change

As can be seen from table 4, the F0 of the micro-speaker module of this example 1 was little changed and the particle state was not changed after the reliability test was performed. Whereas the F0 of the micro-speaker module of comparative example 2 showed a significant increase and the particles were severely broken.

This shows that 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, since the particles of the acoustic adjustment material are unchanged.

< example 2>

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

The foamed filler had a physical size of 0.36mm and a density of 0.1g/mL, and the volume of the foamed filler was 25% of the volume of the acoustic material-filled mixture.

< comparative example 3>

< comparative example 4>

< test items >

< test results >

TABLE 5-comparative table of F0 for three micro speaker modules

Acoustic conditioning material	Comparative example 4	Comparative example 3	Example 2
				Micro speaker module F0	781 Hz	783 Hz	785 Hz

As can be seen from table 5, the F0 differences for the three micro-speakers are small. This indicates that, in example 2, the volume of the cavity portion was occupied after foaming, but the adsorption and desorption effects of the acoustic control material on the vibration gas were not deteriorated.

TABLE 6-reliability comparison table for two micro speaker modules

	F0 before reliability test	F0 after reliability test	△ F0 variation	Acoustically modifying material particle state
					Comparative example 4	781 Hz	918 Hz	137 Hz	Severe particle breakage
Example 2	785 Hz	791 Hz	6 Hz	Without change

As can be seen from table 6, after the reliability test was performed, F0 of the micro-speaker module of example 2 was changed by 6 Hz, whereas F0 of the micro-speaker module of comparative example 4 was changed by 137 Hz.

This shows that 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, since the particles of the acoustic adjustment material are unchanged.

< example 3>

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

The physical size of the foam filler after foaming became 20mm, the density was 0.07g/mL, and the volume of the foam filler was 55% of the volume of the acoustic material-filled mixture.

< comparative example 5>

< comparative example 6>

The material of the acoustic adjusting material is a molecular sieve. The molecular sieve is granular, the physical size is 0.3mm-0.5mm, and the density is 0.5 g/mL.

< test items >

< test results >

TABLE 7 comparison table of F0 for three micro speaker modules

Acoustic conditioning material	Comparative example 6	Comparative example 5	Example 3
				Micro speaker module F0	781 Hz	785 Hz	786 Hz

As can be seen from table 7, F0 for the speaker of example 3 was substantially the same as that of comparative examples 5 and 6. This indicates that, in example 3, although the foam filler occupies a part of the volume of the rear chamber, the adsorption and desorption effects of the acoustic conditioning material on the vibration gas are not deteriorated.

TABLE 8-reliability comparison table for two micro speaker modules

	F0 before reliability test	F0 after reliability test	△ F0 variation	Acoustically modifying material particle state
					Comparative example 6	781 Hz	918 Hz	137 Hz	Severe particle breakage
Example 3	786 Hz	791 Hz	5 Hz	Without change

As can be seen from table 8, the F0 of the micro-speaker module of this example 3 was little changed and the particle state was not changed after the reliability test was performed. Whereas the F0 of the micro-speaker module of comparative example 6 showed a significant increase and the particles were severely broken.

This shows that 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 6, since the particles of the acoustic adjustment material are unchanged.

In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An acoustic conditioning material, comprising:

2. The acoustic conditioning material of claim 1, wherein the expandable buffering filler and the acoustic improvement filler are both particulate materials, and the expandable buffering filler and the acoustic improvement filler are bonded to form the composite particles.

3. The acoustic conditioning material of claim 1, wherein the expandable buffering filler and the acoustic improvement filler are both particulate materials, and a plurality of the acoustic improvement fillers are bonded around the expandable buffering filler.

4. The acoustic conditioning material of claim 1, wherein the expandable buffering filler and the acoustic improvement filler are both particulate materials, the acoustic improvement filler being wrapped around the expandable buffering filler.

5. The acoustic conditioning material of claim 1, wherein the physical dimensions of the expandable buffering filler after foaming are 0.1mm-25 mm.

6. The acoustic conditioning material of claim 1, wherein the foamable buffering filler has a density after foaming in the range of 0.01 to 1.2 g/mL.

7. The acoustic conditioning material of claim 1, wherein the expandable buffering filler comprises a high molecular polymer filler and a blowing agent mixed together.

8. The acoustic conditioning material of claim 1, wherein 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, metal-organic framework material.

9. The acoustic conditioning material of claim 1, wherein the foamable buffer filler is triggered by at least one of thermal radiation, optical radiation, electromagnetic radiation.

10. The acoustic conditioning material of claim 1, wherein the expandable buffering filler comprises 0.01% -35% of the total volume of the acoustic conditioning material prior to foaming; after foaming, the volume of the foam cushion filler accounts for 0.05-65% of the total volume of the acoustic conditioning material.

11. The acoustic conditioning material of claim 1, wherein the foamable buffer filler is triggered by a physical foaming method or a chemical foaming method.

12. The acoustic conditioning material of claim 1, wherein the volume of the foam cushion filler is 2-200 times the volume of the expandable cushion filler.

13. The acoustic conditioning material of claim 1, wherein the foaming process of the foamable cushion filler includes a first foaming stage resulting in a first foam cushion filler and a second foaming stage resulting in a second foam cushion filler.

14. The acoustic conditioning material of claim 13, wherein the volume of the second foam cushion filler is 1-25 times the volume of the first foam cushion filler.

15. A sound generating device, comprising a housing, a sound generating unit and the acoustic adjusting material according to any one of claims 1 to 14, wherein the interior of the housing forms a cavity, the cavity comprises a rear sound cavity, the sound generating unit is disposed in the cavity, the sound generating unit is communicated with the rear sound cavity, the rear sound cavity comprises a filling area, and the acoustic adjusting material is disposed in the filling area.

16. The sound generating apparatus of claim 15, wherein the acoustic conditioning material has a fill rate of 50% -95% in the filling region prior to foaming.

17. A method of filling an acoustic conditioning material for a sound generating device, comprising the acoustic conditioning material of any of claims 1-14, disposed within a filling area of a rear acoustic cavity of the sound generating device in a manner that:

filling the filling zone with composite particles.

18. An electronic device, characterized in that it comprises a sound-emitting device according to any one of claims 15-16.