CN111534019A

CN111534019A - Acoustic adjusting material, sound production device, filling method, and electronic device

Info

Publication number: CN111534019A
Application number: CN202010659964.2A
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: WO2022007334A1

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 a buffer filler and an acoustic improvement filler, the buffer filler is foamed under a triggered condition to form a foam buffer filler, so that the acoustic improvement filler provides a buffer effect when moving and colliding, and the volume of the foamed buffer filler is changed along with the change of temperature and/or foaming time, so that different buffer effects are achieved. The embodiment of the application flexibly 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 buffer filler. In the working process of the sound generating device, the 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 for a sound generating device, the 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, including:

the damping material comprises a buffering filler and an acoustic improvement filler, wherein the buffering filler foams under a triggered condition to form a foam buffering filler so as to provide a buffering effect on the acoustic improvement filler during moving collision, and the foamed volume of the buffering filler changes along with the change of temperature and/or foaming time.

Optionally, the damping of the cushion filler is increased when the temperature is increased during foaming, and the cushioning capacity of the cushion filler is enhanced.

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

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

Optionally, the density of the foamed buffer filler ranges from 0.01 to 2 g/mL.

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

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

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

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

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

Optionally, the foaming process of the 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.

Optionally, 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.

Optionally, the cushion filler forms a cushion layer and is positioned on one or more inner walls of the cavity of the filling area, and the cushion layer is of a single-layer integral material or a layer structure formed by combining a plurality of granular materials;

the acoustic improvement filler is filled in a filling zone whose inner wall contains the buffer layer filler.

Optionally, the cushioning filler and the acoustic improvement filler are both bulk materials;

the buffering fillers and the acoustic improvement fillers are alternately arranged; or the block-shaped buffer filler and the block-shaped acoustic improvement filler in the same layer are distributed in a matrix, and the buffer filler and the acoustic improvement filler are arranged in a staggered mode.

In a third aspect, embodiments of the present application provide a method for filling the acoustic conditioning material according to the first aspect, including disposing in a filling area of a rear sound cavity of the sound generating device in any of the following manners:

the acoustic adjusting material is granular, firstly, a buffer filler is filled into the filling area, and then, an acoustic improving filler is filled into the filling area;

the acoustic adjusting material is granular, and firstly, the acoustic improving filler is filled into the filling area, and then the buffer filler is filled into the filling area;

the acoustic adjusting material is granular, the buffer filler and the acoustic improving filler are mixed firstly, and then the mixed buffer filler and acoustic improving filler are filled into a filling area;

the method comprises the steps of firstly arranging a buffer filler on at least one wall part of the filling area to form a buffer filler layer, and then filling the acoustic improvement filler into the filling area.

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:

according to one embodiment of the present application, the acoustic conditioning material includes a cushion filler and an acoustic improvement filler. The foam cushion filler foams after being triggered to become the foam cushion filler, and the foam cushion filler provides a cushioning effect for the flowing and collision of the acoustic improvement filler. In the working process of the sound generating device, the 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.

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 view of a particulate acoustic conditioning material according to an embodiment of the present application in an unfoamed state.

Fig. 2 is a schematic view of a foaming state of a particulate acoustic adjusting material according to an embodiment of the present application.

Fig. 3 is a schematic view of an unfoamed state of a layered acoustic tuning material according to an embodiment of the present application.

Fig. 4 is a schematic view of a foaming state of the layered acoustic adjustment material according to an embodiment of the present application.

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

Fig. 6 is a schematic view of an unfilled state of a grating structure acoustic conditioning material according to an embodiment of the present application.

Description of reference numerals:

11-a housing; 12-a sound generating monomer; 13-clearance; 14-a buffer filler; 15-an acoustically improving filler; 16-the posterior acoustic chamber.

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.

The embodiment of the application provides an acoustic adjusting material for a sound production device, which comprises a buffer filler 14 and an acoustic improvement filler 15, wherein the buffer filler 14 foams under a triggered condition to form a foam buffer filler so as to provide a buffer effect for the acoustic improvement filler 15 during moving collision, and the volume of the foamed buffer filler 14 changes along with the change of temperature and/or foaming time. Therefore, the degree of cushioning of the acoustic improvement filler 15 at the time of a moving collision can be flexibly controlled by the temperature and time at which the cushioning filler 14 is foamed.

Optionally, when the cushion filler 14 foams in a certain temperature range, the temperature rises, the damping of the cushion filler increases, and the buffering capacity of the cushion filler 14 is enhanced.

When the sounding device is impacted by external force, the buffer filler 14 foams under the condition of being triggered to form foam buffer filler, the foam buffer filler provides buffer force for flow and collision of the acoustic improvement filler, and in the working process of the sounding device, the collision rate of the acoustic improvement filler is reduced. 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 cushion 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, the cushion filler 14 can effectively cushion the flow and collision of the acoustic improvement filler 15. In particular, the damping filler 14 effectively damps the vibrations of the acoustic conditioning material when the sound generating apparatus 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 cushioning filler 14 has a good shock-proof effect.

In addition, the different triggering temperatures enable the buffer filler 14 to change the foaming volume so as to adapt to different application environments, and therefore the acoustic conditioning material is more weather-resistant and adaptive.

The cushion filler 14 is a material that can be foamed under a predetermined trigger condition. In the non-triggered condition, the cushion filling 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 buffer filler 14 is granular, and the physical size range of the buffer filler 14 after foaming is 0.1-25 mm. Specifically, the shape of the cushion filler 14 may be spherical, spheroidal, rod-like, cylindrical, cubic, or radial.

Within this size range, the cushioning effect of the cushioning filler 14 on the acoustic improvement filler 15 is good, and the cushioning effect of the cells is good.

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

Specifically, the thickness of the buffer filler 14 is moderate, and does not block the airflow channel of the acoustic improvement filler 15, and the adsorption and desorption effects of the acoustic adjusting material on the vibrating airflow are good.

Specifically, when the cushioning filler 14 is in a layered form, these materials have good fluidity and can be easily filled in the cavity. During filling, the layered damping filling 14 can be filled directly into the filling region of the rear sound chamber 16 of the sound generating device. Alternatively, the layered cushion filling 14 may be prepared into a predetermined shape and then filled into the filling region of the rear sound cavity 16 of the sound generating device. It is also possible that the acoustic improvement filler 15 is prepared in a set three-dimensional structure, and the cushion filler 14 is filled in the gaps of the three-dimensional structure.

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

Specifically, the density of the cushioning filler 14, when unfoamed, is from 0.2g/mL to 1.5 g/mL. 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 buffer filler may be preferably selected from 0.01g/mL, 0.04g/mL, 0.08g/mL, and the like. 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 cushion 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 foam concrete is prepared by mixing the buffering filler and the foaming agent in a high-pressure or high-temperature reaction kettle. The method has simple process, and the buffer filler 14 can be formed by one-time 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, 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 buffer charge 14 is activated by at least one of thermal radiation, optical radiation, electromagnetic radiation.

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

Under the same temperature condition, under a certain trigger time, the volume of the buffer filler 14 can be increased to an appropriate value, and if the trigger time is too short, the foaming times of the buffer filler 14 are small, so that the buffer filler does 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 buffer filler 14 can be increased to an appropriate value, and the higher the temperature, the more easily the cell breakage occurs; conversely, the lower the trigger temperature, the smaller the foaming volume of the cushion filler 14, and the less the cushion sound improving filler 15 functions.

The foaming agent in the buffer filler 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 buffer filler.

When electromagnetic radiation is applied, the acoustic conditioning material is heated under the influence of the alternating magnetic field. The foaming agent evaporates to form cells in the cushion 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 buffer 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, the buffer filler 14 accounts for 0.01% -35%, preferably 0.1% -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 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 vibration gas of the acoustic adjusting material are reduced; conversely, the smaller the proportion of the cushion filler 14 in the acoustic adjusting material, the less the cushion effect is obtained.

In the above volume ratio range, although the filling amount of the acoustic improvement filler 15 is relatively reduced, the cushion filler 14 can form channels after foaming, so that the vibration gas can easily enter and exit the acoustic adjustment material, and the sound absorption effect of the acoustic adjustment 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 cushioning filler 14.

Optionally, the mass of the buffer 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 cushion filler 14.

In addition, since the mass ratio of the buffer filler 14 is low, the effect of the acoustic adjusting material in adsorbing and desorbing the vibrating gas is not affected. Preferably, the mass of the buffer filler 14 is 1% -5% of the total mass of the acoustic conditioning 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: the volatile matter dispersed in the expandable buffering filler is volatilized under the conditions of illumination or heating, and the like to generate bubbles.

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

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

The chemical foaming method is as follows: the buffer filler is foamed by chemically generating gas: the chemical foaming agent added into the 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 decomposed under heating to generate gas, and bubbles are formed in the cushion filler.

The foaming may also be carried out by means of gases released by chemical reactions between the components of the buffer 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 cushion filler 14 includes a first foaming stage and a second foaming stage, wherein the first foaming stage obtains a first foam cushion filler, and the second foaming stage obtains a second foam cushion filler. The cushioning effect of the cushioning material 14 can be flexibly controlled by the staged foaming of the cushioning material 14.

The volume of the buffer filler 14 after foaming changes with the change of the foaming temperature and the foaming time, specifically, referring to table 1, the foaming volume of the buffer filler 14 is significantly increased when the temperature rises within a certain temperature range, specifically 80-110 ℃, and can reach dozens of times or even hundreds of times of the initial volume, the damping of the buffer filler 14 is increased accordingly, and the buffer filler 14 can play a powerful buffering role for the acoustic improvement filler 15; within a certain foaming time range, specifically 10-30min, the foaming volume of the buffer filler 14 is increased when the time is increased, the damping of the buffer filler 14 is increased, and the buffering capacity of the buffer filler 14 is enhanced at the same time. Therefore, the foaming degree of the cushion 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 ℃, for example, the foaming is performed at 70 ℃, 60 ℃ or lower, but the foaming volume of the buffer filler 14 is smaller at lower temperature, and a good buffer effect cannot be achieved; the foaming time of the cushion filler 14 may also be longer than 30min, for example, 1h, 2h, 3h or longer, but too long foaming time consumes too many resources such as equipment and electric power, and increases the complexity of the foaming process, so the foaming degree of the cushion 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 cushion filler 14 is applied to a sound-emitting device, if the cushion filler 14 has been foamed to the maximum foamed volume, the strength of the acoustic improvement filler 15 may be weakened during long-term high-temperature use, and there is still a risk of breakage. If the first foam cushion filler is obtained by subjecting the cushion filler 14 to the first foaming stage and the first foam cushion filler is not foamed to the maximum foaming volume, the cushion filler 14 is applied to the sound generating device, and the cushion filler 14 undergoes the second foaming stage at high temperature in the long-term high-temperature use process of the sound generating device, so that the cushion filler 14 can be foamed continuously, and the cushion filler 14 can further buffer the acoustic improvement filler 15 after the volume of the cushion filler 14 is increased, thereby ensuring the service life of the acoustic improvement filler 15. In particular, the cushion filler 14 may frequently undergo a plurality of high-temperature foaming processes during long-term high-frequency use of the sound generating apparatus, so that the second foaming stage herein refers 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 with high power, the buffer filler 14 can be foamed at a high temperature inside the sound generating device, and when the sound generating device is operated for a long time and with high power for many times, the buffer filler 14 can be subjected to foaming processes for many times.

In addition, the cushion filling 14 is typically filled into the filling area of the rear acoustic cavity when applied to a sound generating device. Then the sound chamber adjusts the primary space of low frequency effect as sound generating mechanism, and the buffer filler 14 volume grow after the foaming, must occupy the great volume in back sound chamber, and then influence sound generating mechanism's low frequency effect. It is possible to fill the cushion filling 14 with only the cushion filling 14 through the first foaming stage, in which case the volume of the cushion filling 14 has already increased significantly, but without a very large occupation of the volume of the rear acoustic chamber. The damping filler 14 can also provide a damping effect during the moving impact of the acoustic improvement filler 15; and in the in-service use process of sound generating mechanism, when sound generating mechanism locates under high temperature environment or long-term high power use, 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, buffering 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, buffering filler 14 experiences the foaming back volume of second stage and can further increase, simultaneously buffering filler 14's damping characteristic reinforcing, can improve the motion of filler 15 to acoustics more effectively and play the cushioning effect, reduce or even avoid acoustics to improve filler 15 because the damage that the collision brought. The aging process of the adhesive of the acoustic improvement filler 15 and the second-stage foaming process of the buffer filler 14 can continuously occur in the long-term use process of the sound generating device, namely the continuous second-stage foaming of the buffer 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 first stage foaming, if the maximum foaming volume is not reached, the volume of the cushion filler 14 after the second stage foaming can be further increased, and the damping characteristic and the cushion performance of the cushion filler 14 can be further increased. In a specific embodiment, referring to Table 2, after the cushion filling 14 is subjected to the first stage foaming, and then the second stage foaming is performed under the foaming conditions of 80-100 ℃ and 1-6h, the volume of the cushion filling 14 can be increased by several times, and the second stage foaming process can be performed multiple times during the use of the sound generating device.

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

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

Specifically, the physical size of the cushion filler 14 may be comparable to the physical size of the acoustic improvement filler 15 before foaming, which facilitates uniform mixing of the cushion filler 14 and the acoustic improvement filler 15; it is also possible that the physical size of the buffering filler 14 is larger or smaller than that of the acoustics-improving filler 15, which facilitates the increase in the filling amount of the acoustics-adjusting material. After foaming, the volume of the cushion filler 14 is significantly increased and the density is significantly decreased, which can provide a significant cushioning effect to the acoustic enhancement filler 15 during a moving collision.

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 16, sound production monomer 12 sets up in the cavity, sound production monomer 12 with back vocal cavity 16 intercommunication, back vocal cavity 16 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, the foaming of the cushion filler 14 provides a cushion effect against the flow and collision of the acoustic improvement 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.

In one example, as shown in fig. 1-2, the cushion filler 14 and the acoustic enhancement filler 15 are both granular materials. The buffer filler 14 is mixed with the acoustic improvement filler 15 and filled in the filling region. The buffer filler 14 is uniformly mixed with the acoustic improvement filler 15, and can play an effective buffer role for the acoustic improvement filler 15.

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

In one example, as shown in fig. 5, the cushion filler 14 and the acoustic improvement filler 15 are both block-shaped materials, the block-shaped cushion filler 14 and the block-shaped acoustic improvement filler 15 are distributed in a matrix in the same layer, and the cushion filler 14 and the acoustic improvement filler 15 are arranged in a staggered manner.

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

In one example, as shown in fig. 6, the buffer filler 14 forms a lattice 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, oval, triangular, or rhombic, etc. The grating structure makes the structure of the acoustic adjusting material regular, and the stability and consistency of the adsorption and desorption vibration gas are good.

During filling, the housing 11 is opened and the grid structure is first placed in the filling zone; then, the acoustic improvement filler 15 is filled in the gap 13 formed by the grating structure; next, the case 11 is closed; finally, the cushion filler 14 is foamed by means of heat radiation or the like.

The above filling method can achieve the foaming of the buffer filler 14 after the triggering, and further extrude the acoustic improvement filler 15, and form the buffering effect.

In one example, the volume of the cushion filler increases 2-100 times after foaming. Thus, the foam cushion filler gives a good cushioning effect to the acoustic improvement filler 15.

Preferably, the volume of the cushion filler increases 3-50 times after foaming. Within the range, the foam cushion filler has moderate buffering force and better buffering effect.

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 in any mode:

for example, as shown in fig. 1-2, the acoustic conditioning material is in the form of particles. The buffer filling 14 is first filled into the filling region, and the acoustic improvement filling 15 is then filled into the filling region. In this example, a filling opening is provided in the housing 11. 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 acoustic improvement filler 15. The damping filler 14 also uses particles of different physical sizes to provide a high filling rate of the acoustic conditioning material in the filling zone.

It is also possible to use particles of the same physical size for both the acoustic improvement filler 15 and the cushion filler 14 to ensure the consistency of the acoustic conditioning material.

For example, the acoustic conditioning material is in particulate form. The acoustic improvement filler 15 is first filled into the filling zone, and the buffer filler 14 is then filled into the filling zone. Likewise, during filling, the granules are filled from the filling opening into the filling region. It is possible to use particles of different physical sizes for the acoustic improvement filler 15. The damping filler 14 also uses particles of different physical sizes to provide a high filling rate of the acoustic conditioning material in the filling zone.

For example, the acoustic conditioning material is in particulate form. The cushion filler 14 and the sound-improving filler 15 are mixed, and then the mixed cushion filler 14 and the sound-improving filler 15 are filled into the filling region.

Likewise, during filling, the granules are filled from the filling opening into the filling region. It is possible to use particles of different physical sizes for the acoustic improvement filler 15. The damping filler 14 also uses particles of different physical sizes to provide a high filling rate of the acoustic conditioning material in the filling zone.

For example, as shown in fig. 3-4, the cushion filler 14 is first disposed on at least one wall portion of the filling region to form a cushion filler layer; then, the acoustic improvement filler 15 is filled into the filling zone.

In this example, the acoustic conditioning material may be in the form of particles or sheets. The cushion filling 14 is bonded to at least one wall portion of the filling zone with an adhesive. The filling zone is then filled with the acoustically improving filler 15. In the triggered condition, the wall-side damping filler 14 foams, so that the acoustic improvement filler 15 is compressed, in order to damp the movement of the acoustic improvement filler 15. The foamed cushion filler 14 serves as a cushion for the acoustic improvement filler 15.

Optionally, a cushion packing 14 is formed at two opposite wall portions of the cavity. In the triggered condition, the cushion fillers 14 of the two wall portions are foamed, so that the acoustic improvement filler 15 is pressed in two opposite directions, which makes the foam cushion filler more excellent in the cushioning effect of the acoustic improvement filler 15.

Further, the cushion filler 14 after foaming forms a cushioning effect on opposite sides of the acoustic improvement filler 15, which makes the acoustic adjusting material more durable.

Further, a cushion packing 14 is formed at all wall portions of the cavity. In this way, the cushion filler 14 forms a cushioning effect in any direction of the acoustic improvement filler 15, which makes the durability of the acoustic conditioning material more excellent.

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 16 of the micro-speaker module is 0.4 cc. The acoustic conditioning material is mixed and filled into the rear acoustic chamber 16.

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 16.

< 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 loudspeakerModule 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 damping of the cushion filler increases and the cushioning capacity of the cushion filler increases as the temperature increases during foaming.

3. The acoustic conditioning material of claim 1, wherein the cushion filler is in a granular form, and the physical size of the cushion filler after foaming is in a range of 0.1 to 25 mm.

4. The acoustic conditioning material according to claim 1, wherein the cushion filler is in a layered form, and the thickness of the cushion filler after foaming is in a range of 0.01 to 5 mm.

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

6. The acoustic conditioning material of claim 1, wherein the cushion filler comprises a high molecular polymer filler and a foaming agent mixed together.

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

8. The acoustic conditioning material of claim 1, wherein the buffer 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.

9. The acoustic conditioning material of claim 1, wherein the cushion filler is triggered by a physical foaming process or a chemical foaming process.

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

11. The acoustic conditioning material of claim 1, wherein the physical dimensions of the cushion filler before foaming are 10% to 500% of the physical dimensions of the acoustic improvement filler, and the physical dimensions of the cushion filler after foaming are 100% to 800% of the physical dimensions of the acoustic improvement filler.

12. The acoustic conditioning material of claim 1, wherein the foaming process of the 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.

13. The acoustic conditioning material of claim 12, wherein the volume of the second foam cushion filler is 1-25 times the volume of the first foam cushion filler.

14. A sound generating device, comprising a housing, a sound generating unit and the acoustic adjusting material according to any one of claims 1 to 13, 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.

15. The sound generating apparatus of claim 14, wherein the acoustic conditioning material has a fill rate of 50% -95% in the filling zone prior to foaming.

16. The sound generating apparatus of claim 14 wherein the damping filler and the acoustic enhancement filler are both granular materials, and the damping filler is mixed with the acoustic enhancement filler and filled in the filling region.

17. The sound generating apparatus of claim 14, wherein the cushioning filler forms a cushioning layer on one or more interior walls of the filling area cavity, the cushioning layer being a single layer of unitary material or a layer of a combination of a plurality of granular materials;

18. The sound generating apparatus of claim 14 wherein the damping filler and the acoustic enhancement filler are both bulk materials, the damping filler alternating with the acoustic enhancement filler; or the block-shaped buffer filler and the block-shaped acoustic improvement filler in the same layer are distributed in a matrix, and the buffer filler and the acoustic improvement filler are arranged in a staggered mode.

19. A method of filling an acoustic conditioning material for a sound generating device, comprising the acoustic conditioning material of any of claims 1-13, disposed in a filling area of a rear acoustic cavity of the sound generating device in any of the following ways:

20. An electronic device, characterized in that it comprises a sound emitting device according to any one of claims 14-18.