CN111560133A - Acoustic adjusting material, filling method, sound production device and electronic equipment - Google Patents
Acoustic adjusting material, filling method, sound production device and electronic equipment Download PDFInfo
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- CN111560133A CN111560133A CN202010660118.2A CN202010660118A CN111560133A CN 111560133 A CN111560133 A CN 111560133A CN 202010660118 A CN202010660118 A CN 202010660118A CN 111560133 A CN111560133 A CN 111560133A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
- C08J9/141—Hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J9/0066—Use of inorganic compounding ingredients
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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- C08J2323/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2487/00—Characterised by the use of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
Abstract
The invention discloses an acoustic adjusting material, a sound production device, a filling method and electronic equipment. The acoustic conditioning material includes: the acoustic improvement filler comprises an expandable polyolefin filler and an acoustic improvement filler, wherein the expandable polyolefin 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 when the acoustic improvement filler is collided in a moving mode, and the volume of the expanded expandable polyolefin filler is changed along with the change of temperature and/or foaming time. 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.
Description
Technical Field
The invention relates to the technical field of electroacoustic conversion, in particular to an acoustic adjusting material of a sound generating device, a filling method, the sound generating device and electronic equipment.
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 ZL201921855579.4 discloses a filler for speaker, and 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, improves the sound quality of equidirectional, does to a certain extent reduce the granule collision. However, when triggered by expansion, the expandable filler is permanently expanded from an initial first size to a fixed second size, the size of the expandable filler is not changed any more, and the expansion degree of the expandable filler cannot be effectively adjusted according to different use environmental conditions, so that the applicability of the expandable filler is reduced.
Therefore, a new technical solution is needed to solve the above technical problems.
Disclosure of Invention
An object of the present invention is to provide a new technical solution for an acoustic conditioning material of a sound emitting device.
According to a first aspect of the present invention, there is provided an acoustic conditioning material. The acoustic conditioning material includes: an expandable polyolefin filler which expands under triggered conditions to form a foam cushioning filler to cushion the movement of the acoustic improvement filler, and an acoustic improvement filler, the expanded volume of which changes with temperature and/or expansion time. Optionally, the expandable polyolefin filler contains olefin chain units in the molecular chain, and the molecular structure of the olefin chain units comprises at least one of-CH 2-CH2-, -CH (R) -CH 2-and-CH (R) -.
Optionally, the expandable polyolefin filler is polymerized from one or more of ethylene, propylene, butene, pentene, hexene.
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 expandable polyolefin filler is spherical, spheroidal, rod-like, cylindrical, cubic, or radial.
Optionally, the expandable polyolefin filler has a density of 0.005g/mL to 0.7g/mL after foaming.
Optionally, the expandable polyolefin filler is in particulate form, and after expansion, the expandable polyolefin filler has a physical size of 0.1mm to 25 mm.
Optionally, the expandable polyolefin filler comprises a high molecular polyolefin material and a blowing agent mixed together, wherein the blowing agent comprises a low boiling alkane or the like.
Optionally, the expandable polyolefin filler is triggered by at least one of thermal radiation, light radiation, electromagnetic radiation.
Optionally, the expandable polyolefin filler comprises 0.01% -35% of the total volume of the acoustical modifying 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.
Optionally, the expandable polyolefin filler comprises 0.1% -15% of the total volume of the acoustical modifying material prior to foaming; after foaming, the volume of the foam cushion filler accounts for 5% -55% of the total volume of the acoustic conditioning material.
Optionally, the foam cushioning filler formed by the expandable polyolefin filler cushions the acoustic improvement filler after foaming.
Optionally, the expandable polyolefin filler increases in volume by a factor of 2 to 160 after foaming.
Optionally, the expandable polyolefin filler increases in volume by a factor of 3 to 110 after foaming.
Optionally, the foaming process of the expandable polyolefin filler comprises a first foaming stage and a second foaming stage, the first foaming stage resulting in a first foam cushion filler, the second foaming stage resulting in 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.
According to a second aspect of the present disclosure, a sound emitting device is provided. This sound generating mechanism includes casing, sound production monomer and foretell acoustics adjusting material, the inside formation cavity of casing, the cavity includes back vocal cavity, sound production monomer sets up in the cavity, sound production monomer with back vocal cavity intercommunication, back vocal cavity includes the filling district, acoustics adjusting material sets up in the filling district.
Optionally, the filling rate of the acoustic conditioning material in the filling zone before foaming is 45% -95%.
Optionally, the expandable polyolefin filler and the acoustic enhancement filler are both particulate materials,
the expandable polyolefin filler is mixed with the acoustic improvement filler and filled in the filling area.
Optionally, the expandable polyolefin filler and the acoustic enhancement filler are both bulk materials,
the expandable polyolefin filler is arranged alternately with the acoustic improvement filler; or the block-shaped expandable polyolefin filler and the block-shaped acoustic improvement filler in the same layer are distributed in an array, and the expandable polyolefin filler and the acoustic improvement filler are arranged in an interlaced manner.
Optionally, the expandable polyolefin filler forms a lattice structure, and the acoustic improvement filler is filled in gaps formed by the expandable polyolefin filler; or the acoustic improvement filler forms a lattice structure, and the expandable polyolefin filler is filled in gaps formed by the acoustic improvement filler.
According to a third aspect of the present disclosure, there is provided a filling method of an acoustic conditioning material of a sound emitting device. The acoustic conditioning material is disposed within the filling area of the rear acoustic cavity of the sound generating device in any of the following ways:
the acoustic adjusting material is granular, and the filling area is filled with expandable polyolefin filler firstly, and then filled with acoustic improving filler;
the acoustic adjusting material is granular, and firstly, acoustic improving filler is filled into the filling area, and then expandable polyolefin filler is filled into the filling area;
the acoustic adjusting material is granular, the expandable polyolefin filler and the acoustic improving filler are mixed firstly, and then the mixed expandable polyolefin filler and acoustic improving filler are filled into a filling area;
an expandable polyolefin filler is first arranged in at least one wall portion of the filling zone to form an expandable polyolefin filler layer, and then an acoustic improvement filler is filled into the filling zone.
According to a fourth aspect of the present disclosure, an electronic device is provided. The electronic equipment comprises the sound generating device.
According to one embodiment of the present disclosure, an acoustic conditioning material includes an expandable polyolefin filler and an acoustic improvement filler. Upon being triggered, the foaming of the expandable polyolefin filler becomes a foam that provides a cushioning effect to acoustically improve the flow, impact of the filler. In the working process of the sound production device, the expandable polyolefin filler greatly reduces the risk of acoustic improvement filler breakage, improves the durability of the acoustic adjusting material and prolongs the service life of the acoustic adjusting material.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic illustration of a particulate acoustic conditioning material in an unfoamed state according to an embodiment of the disclosure.
Fig. 2 is a schematic view of a foaming state of a particulate acoustic adjusting material according to an embodiment of the present disclosure.
Fig. 3 is a schematic view of a bulk acoustic conditioning material in an unfoamed state according to an embodiment of the disclosure.
Fig. 4 is a schematic view of a foaming state of a bulk acoustic adjusting material according to an embodiment of the present disclosure.
Fig. 5 is a schematic diagram of an unfoamed state of an array of distributed bulk acoustic conditioning material according to an embodiment of the disclosure.
Fig. 6 is a schematic illustration of an unfilled state of a grille-structure acoustic conditioning material in accordance with an embodiment of the present disclosure.
Description of reference numerals:
11: a housing; 12: a sounding monomer; 13: a gap; 14: an expandable polyolefin filler; 15: an acoustic improving filler; 16: the posterior acoustic chamber.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
According to one embodiment of the present disclosure, an acoustic conditioning material for a sound generating device is provided. As shown in fig. 1 to 2, the acoustic conditioning material includes: expandable polyolefin filler 14 and acoustic improving filler 15. The expandable polyolefin filler 14 is foamed under triggered conditions into a foam cushion filler to cushion the movement of the acoustic improvement filler 15, the volume of the expandable polyolefin filler 14 being varied with temperature and/or foaming time.
The degree of cushioning of the acoustic enhancement filler 15 upon a moving impact can be flexibly controlled by the temperature and time at which the expandable polyolefin filler 14 is foamed. As the expandable polyolefin filler 14 expands, the temperature increases, the damping of the expandable polyolefin filler 14 increases, and the cushioning capacity of the expandable polyolefin filler 14 increases. The higher the temperature is, the larger the volume of the foam cushion filler is in a set time; the longer the foaming time, the greater the volume of foam cushion at a given temperature.
When the sounding device is impacted by external force, 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 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.
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. For example, the expandable polyolefin filler is polymerized from one or more of ethylene, propylene, butene, pentene, hexene. 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 acoustically improving filler 15 means a porous material capable of adsorbing and desorbing the vibrating 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 polyolefin filler is spherical, spheroidal, rod-like, cylindrical, square or radial. The filling effect of the shape is good, and the filling rate is high.
In the disclosed embodiment, the acoustic conditioning material includes an expandable polyolefin filler 14 and an acoustic improvement filler 15. The expandable polyolefin filler 14 expands under triggered conditions to become a foam cushioning filler to cushion the movement of the acoustic improvement filler 15. The acoustic enhancement filler 15 is less likely to collide during operation of the sound generating apparatus. In this way, the expandable polyolefin filler 14 greatly reduces the risk of breakage of the acoustic improvement filler 15, increasing the durability and service life of the acoustic conditioning material.
In addition, the expandable polyolefin filler 14 forms cells after foaming. The expandable polyolefin 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 expandable polyolefin filler 14 can effectively buffer the flow, impact of the acoustic improvement filler 15.
In particular, the expandable polyolefin filler 14 effectively dampens 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 with a small negative acceleration, and therefore, the expandable polyolefin filler 14 has a good shock-proof effect.
In addition, the different triggering temperatures enable the expandable polyolefin filler 14 to change the volume of the foaming so as to adapt to different application environments, and therefore the acoustic conditioning material has stronger weather resistance and adaptability.
In one example, the expandable polyolefin filler 14 includes an expandable polyolefin material and a blowing agent mixed together, wherein the blowing agent includes a low boiling alkane. For example, low boiling alkanes have a boiling point of 30 ℃ to 40 ℃. In the preparation process, the expandable high molecular material containing olefin chain links and the foaming agent are mixed together in a high-pressure reaction kettle. In the high-pressure reaction kettle, the expandable high-molecular material containing olefin chain links is polymerized together and mixed with the foaming agent. The process is simple and the expandable polyolefin filler 14 can be formed by one reaction.
Or, the expandable high molecular material containing olefin chain links is polymerized into the expandable polyolefin material, and then the foaming agent is added into the expandable polyolefin material to enable the foaming agent to permeate into the expandable polyolefin 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 polyolefin 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.
In one example, the expandable polyolefin filler 14 is at least one of expandable ethylene, propylene, and other high molecular polymers. The expandable polyolefin filler 14 described above is capable of foaming in volume under a set trigger condition, thereby damping the motion of the acoustically improving filler 15.
For example, expandable polyethylene includes polyethylene and a blowing agent mixed together.
Wherein, the expandable polyethylene 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.
In one example, the expandable polyolefin filler 14 is in the form of particles or sheets. These materials have good fluidity and can be easily filled in a cavity.
The expandable polyolefin filler 14 in the form of particles or sheets may be directly filled into the filling area of the rear sound chamber 16 of the sound-emitting device.
It is also possible to prepare the expandable polyolefin filler 14 in the form of particles or sheets into a predetermined shape and fill the filling region of the rear sound chamber 16 of the sound generating device.
It is also possible that one of the expandable polyolefin filler 14 and the acoustic improvement filler 15 is prepared in a set three-dimensional structure, and the other is filled in the gaps of the three-dimensional structure in a granular or sheet form.
In one example, the expandable polyolefin filler 14 is particulate. After foaming, the expandable polyolefin filler 14 has a physical size of 0.1mm to 25 mm.
Within this size range, the cushioning effect of the expandable polyolefin filler 14 on the acoustic improving filler 15 is good, and the cushioning effect of the cells is good.
In addition, the particles are moderate in size, 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 vibrating airflow are good.
Further, the expandable polyolefin filler is in the form of particles, and after the expansion, the expandable polyolefin filler 14 has a physical size of 0.5mm to 2 mm. Within this range, the cushioning effect of the acoustic improving filler is more excellent by the expandable polyolefin filler 14 forming cells.
In one example, the expandable polyolefin filler 14 has a density of 0.2g/mL to 1.8g/mL when the acoustic enhancement filler is 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.
Preferably, the expandable polyolefin filler 14 has a density of 0.5g/mL to 1.2g/mL before foaming, within which range the acoustic conditioning material has little effect on the overall weight of the sound emitting device.
In one example, the expandable polyolefin filler has a density of 0.005g/mL to 0.7g/mL after foaming. Within this range, the foam cushion filler has a good cushioning effect on the acoustic improvement filler, high structural strength, and good durability.
Preferably, the expandable polyolefin filler has a density of 0.01g/mL to 0.08 g/mL. Within this range, the foam cushion filler has a better cushioning effect with respect to the acoustic improvement filler.
In one example, the expandable polyolefin filler 14 is triggered by at least one of thermal radiation, optical radiation, electromagnetic radiation. Under the above irradiation conditions, the foaming agent in the expandable polyolefin filler 14 volatilizes and becomes larger in volume, forming cells in the expandable polyolefin material, thereby causing the expansion of the expandable polyolefin material.
Under the same temperature condition, the volume of the expandable polyolefin filler 14 can be increased to an appropriate value under a certain trigger time, and if the trigger time is too short, the expansion factor of the expandable polyolefin filler 14 is small, and the function of buffering the acoustic improvement filler 15 is not achieved.
At the same trigger time and at a certain trigger temperature, the volume of the expandable polyolefin filler 14 can be increased to an appropriate value, and cell breakage is more likely to occur at higher temperatures; conversely, the lower the trigger temperature, the smaller the foaming volume of the expandable polyolefin filler 14, and the less the function of the cushioning acoustic improvement filler 15.
In addition, the cells within the expandable polyolefin filler 14 are not subject to rupture.
The blowing agent in the expandable polyolefin filler 14 is triggered by means of ultraviolet radiation upon being subjected to light radiation. The blowing agent becomes voluminous under heat, thereby forming cells within the expandable polyolefin filler.
When electromagnetic radiation is applied, the acoustic conditioning material is heated under the influence of the alternating magnetic field. The blowing agent volatilizes, forming cells within the expandable polyolefin 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 polyolefin filler 14 is not limited to the above-described embodiment, and those skilled in the art can select it according to actual needs.
In one example, the expandable polyolefin filler comprises 0.01% to 35% of the total volume of the acoustical modifying material prior to foaming; after foaming, the expandable polyolefin filler 14 accounts for 0.05-65% of the volume of the acoustic adjusting material.
Before foaming, the proportion of the acoustic improvement filler is large in the proportion range, and the acoustic improvement filler can be uniformly dispersed in the cavity.
The larger the proportion of the expandable polyolefin 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 expandable polyolefin filler 14 in the acoustic adjusting material, the less the cushioning effect will be.
In the above-mentioned volume ratio range, although the filling amount of the acoustic improvement filler 15 is relatively reduced, the expandable polyolefin 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 polyolefin filler 14.
Further, before foaming, the expandable polyolefin filler accounts for 0.1% -15% of the total volume of the acoustic adjusting material; after foaming, the volume of the foam cushion filler accounts for 5% -55% of the total volume of the acoustic conditioning material. Within this range, the sound absorbing effect of the acoustic adjusting material is more excellent and the durability is excellent.
In one example, the expandable polyolefin filler 14 comprises 0.1% to 25% by mass of the total mass of the acoustic conditioning material. Within this range, a higher filling rate within the cavity can be achieved with less expandable polyolefin filler 14.
In addition, since the expandable polyolefin filler 14 occupies a low mass ratio, the effect of the acoustic adjusting material in adsorbing and desorbing the vibrating gas is not affected.
Further, the expandable polyolefin filler 14 accounts for 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.
In one particular example, the foaming process of the expandable polyolefin filler 14 includes a first foaming stage that results in a first foam cushion filler and a second foaming stage that results in a second foam cushion filler. The cushioning effect of the expandable polyolefin filler 14 can be flexibly controlled by the staged foaming of the expandable polyolefin filler 14.
Under trigger conditions, the expandable polyolefin filler 14 expands in volume at different temperatures and/or expansion times. In application after foaming, the first foam cushion filler is subjected to a second stage foaming process along with the change of the use temperature, and the foaming volume is different along with different temperatures and/or foaming time in the second stage foaming process. After foaming, the first foam cushion filling has a certain inhibiting effect on the acoustic improvement effect, because it occupies the back cavity volume.
Thus, during the initial stage of filling, the expandable polyolefin filler 14 undergoes a first stage of expansion, and the first foam cushion filler provides a certain cushioning effect. In the practical application process, if meet sound generating mechanism high power operation under the high temperature environment, when sound generating mechanism is in high power operation, the gluing agent that the filler was improved to acoustics can be ageing, and intensity variation, and the filler is improved to acoustics is broken easily. Under the condition, the expandable polyolefin filler 14 is easier to continue to expand, the damping characteristic of the surface of the first foam buffer filler is further improved, and the impact of the acoustic improvement filler is buffered, so that the crushing of the acoustic improvement filler is reduced.
Even under normal circumstances, the adhesive of the acoustic improving filler slowly ages with time, resulting in a decrease in strength. In the process, the volume of the first foam buffering filler is slowly changed, the surface damping characteristic is increased, the buffering capacity is enhanced, and under the condition, the expandable polyolefin filler 14 can be subjected to foaming change at the second stage, so that the damping is enhanced, the buffering effect is improved, and the fragile phenomenon caused by poor strength of the acoustic improvement filler is effectively avoided.
Specifically, referring to table 1, the foamed volume of the expandable polyolefin filler 14 varies with the foaming temperature and/or the foaming time, and the damping of the expandable polyolefin filler increases when the temperature rises within a certain temperature range, so that the buffering capacity of the expandable polyolefin filler is enhanced; the damping of the expandable polyolefin filler increases over time and the cushioning capacity of the expandable polyolefin filler increases over a range of temperatures. Therefore, the degree of foaming of the expandable polyolefin filler 14 can be controlled by the foaming temperature and/or the foaming time.
TABLE 1 volume as a function of temperature data for the first foaming stage of expandable materials
When the expandable polyolefin filler 14 is applied to a sound-emitting device, if the expandable polyolefin filler 14 has been expanded to the maximum expanded 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 expandable polyolefin filler 14 is subjected to the first foaming stage to obtain the first foam buffer filler, and the first foam buffer filler is not foamed to the maximum foaming volume, the expandable polyolefin filler 14 is applied to the sound generating device, and the expandable polyolefin filler 14 is subjected to the second foaming stage at high temperature in the long-term high-temperature use process of the sound generating device, so that the expandable polyolefin filler 14 can be foamed continuously, the volume of the expandable polyolefin filler 14 can be further buffered for the acoustic improvement filler 15 after being increased, and the service life of the acoustic improvement filler 15 is ensured.
The expandable polyolefin filler 14 may frequently undergo a plurality of high-temperature foaming processes during a long-term high-frequency use of the sound generating apparatus, and therefore, the second foaming stage herein refers not only to one foaming stage but also to 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 expandable polyolefin filler 14 can be subjected to a foaming stage, and when the sound generating device is operated for a plurality of times for a long time and at a high power, the expandable polyolefin filler 14 undergoes a plurality of foaming processes.
Optionally, the volume of the second foam cushion filler is 1-25 times the volume of the first foam cushion filler.
Specifically, after the expandable polyolefin filler 14 has been expanded in the first stage, if the maximum expanded volume is not reached, the volume of the expandable polyolefin filler 14 after continuing to expand in the second stage may be further increased.
In a specific embodiment, referring to Table 2, the volume of foam increases with increasing temperature when the expandable polyolefin filler 14 is in the range of 80-100 ℃.
TABLE 2 volume as a function of temperature data for the second foaming stage of the expandable Material
Optionally, the physical size of the expandable polyolefin filler 14 before foaming is 20% to 400% of the physical size of the acoustically improving filler 15, and the density of the expandable polyolefin filler 14 before foaming is 30% to 500% of the density of the acoustically improving filler 15.
Specifically, the physical size of the expandable polyolefin filler 14 may be comparable to the physical size of the acoustic improvement filler 15 before foaming, which facilitates uniform mixing of the expandable polyolefin filler 14 and the acoustic improvement filler 15; it is also possible that the physical size of the expandable polyolefin filler 14 is larger or smaller than that of the acoustic improving filler 15, which facilitates the increase in the filling amount of the acoustic adjusting material. After foaming, the expandable polyolefin filler 14 has a significant increase in volume and a significant decrease in density, which can provide significant cushioning of the acoustic enhancement filler 15 during a moving impact.
According to another embodiment of the present disclosure, a sound generating device is provided. The sound generating device comprises a shell 11, a sound generating unit 12 and the sound adjusting material of the sound generating device provided by the disclosure. The interior of the housing 11 forms a cavity. The cavity comprises a rear acoustic cavity 16. The rear acoustic chamber 16 includes a filling section. The filling area may be the entire rear acoustic chamber 16 or may be a portion of the rear acoustic chamber 16. The sound generating unit 12 is arranged in the cavity. The sound generating unit 12 is communicated with the rear sound cavity 16. The acoustic conditioning material is disposed within the filling zone.
The sound production device has the characteristics of good sound production effect, good low-frequency effect and good durability.
In one example, the filling rate of the acoustic conditioning material in the filling zone is 45% -95% without being triggered. Within this ratio range, the flow and impact of the acoustically improved filler can be cushioned by foaming the expandable polyolefin filler 14.
Preferably, the filling rate of the acoustic conditioning material in the filling zone is 55% 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. 3-4, the expandable polyolefin filler 14 and the acoustic improvement filler 15 are both bulk materials. The expandable polyolefin filler 14 is arranged alternately with the acoustic improvement filler 15. In this example, the expandable polyolefin filler 14 can effectively extrude the acoustic improvement filler 15 in the direction of arrangement of the two fillers, thereby allowing the acoustic improvement filler 15 to effectively cushion.
In one example, as shown in fig. 5, the block-shaped expandable polyolefin fillers 14 and the block-shaped acoustic improvement fillers 15 in the same layer are distributed in an array, and the expandable polyolefin fillers 14 and the acoustic improvement fillers 15 are arranged alternately.
In this example, in the foamed state, the expandable polyolefin filler 14 can effectively press the acoustic improvement filler 15 in all directions of the same layer, thereby effectively damping the movement of the acoustic improvement filler 15.
In one example, as shown in FIG. 6, the expandable polyolefin filler 14 forms a lattice structure. The acoustic improvement filler 15 is filled in the gap 13 formed by the expandable polyolefin filler 14.
Alternatively, the acoustic improvement filler 15 forms a lattice structure. The expandable polyolefin filler 14 is filled in the gap 13 formed by the acoustic improvement filler 15.
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 improving filler 15 or the expandable polyolefin filler 14 is filled in the gap 13 formed by the lattice structure; next, the case 11 is closed; finally, the expandable polyolefin filler 14 is foamed by means of heat radiation or the like.
The above filling methods can achieve the foaming of the expandable polyolefin 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 expandable polyolefin filler increases 2-160 times after foaming. Thus, the foam cushion filler gives a good cushioning effect to the acoustic improvement filler 15.
Preferably, the volume of the expandable polyolefin filler increases 3-110 times after foaming. Within the range, the foam cushion filler has moderate buffering force and better buffering effect.
According to another embodiment of the present disclosure, there is provided a filling method of an acoustic conditioning material.
In one example, the acoustic conditioning material is disposed within the filling zone in any of the following ways:
for example, as shown in fig. 1-2, the acoustic conditioning material is in the form of particles. The filling zone is filled with the expandable polyolefin filler 14 first, and then the filling zone is filled with the acoustic improvement filler 15. 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. Expandable polyolefin filler 14 also employs particles of different physical sizes to provide a high fill rate of acoustic tuning material in the filling zone.
It is also possible to use particles of the same physical size for both the acoustic improving filler 15 and the expandable polyolefin 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 expandable polyolefin 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. Expandable polyolefin filler 14 also employs particles of different physical sizes to provide a high fill rate of acoustic tuning material in the filling zone.
For example, the acoustic conditioning material is in particulate form. The expandable polyolefin filler 14 and the sound-improving filler 15 are mixed first, and then the expandable polyolefin filler 14 and the sound-improving filler 15 after mixing are 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. Expandable polyolefin filler 14 also employs particles of different physical sizes to provide a high fill rate of acoustic tuning material in the filling zone.
For example, as shown in fig. 3 to 4, the expandable polyolefin filler 14 is first disposed on at least one wall portion of the filling region to form an expandable polyolefin 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. Expandable polyolefin filler 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 expandable polyolefin filler 14 of the wall portion is foamed, thereby pressing the acoustic improvement filler 15 to buffer the movement of the acoustic improvement filler 15. The foamed expandable polyolefin filler 14 serves as a buffer for the acoustic improvement filler 15.
Optionally, expandable polyolefin filler layers are formed on the two opposite wall portions of the cavity. In the triggered condition, the expandable polyolefin fillers 14 of the two wall portions are foamed, so that the acoustic improvement filler 15 is squeezed in two opposite directions, which makes the foam cushion filler more excellent in the cushioning effect of the acoustic improvement filler 15.
In addition, the foamed expandable polyolefin filler layer provides cushioning on opposite sides of the acoustic improving filler 15, which makes the acoustic adjusting material more durable.
Further, an expandable polyolefin filler layer is formed on all the wall portions of the cavity. In this way, the expandable polyolefin filler layer forms a cushioning effect in any direction of the acoustic improving filler 15, which makes the durability of the acoustic adjusting material more excellent.
According to yet another embodiment of the present disclosure, an electronic device is provided. The electronic device may be, but is not limited to, a cell phone, a tablet, a smart watch, a game console, a learning machine, and the like.
The electronic equipment comprises the sound generating device of the embodiment of the disclosure. The electronic equipment has the characteristic of good acoustic effect.
< example 1>
The acoustic conditioning material includes an acoustic improving filler 15 and an expandable polyethylene 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 weight percentage of the expandable polyethylene filler is 2 percent.
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 filling, the microspeaker module was placed in an oven and heated at 100 ℃ for 20 minutes to foam the expandable polyethylene filler.
The foamed foam buffering filler has the physical size of 0.5-1.3 mm and the density of 0.03g/mL, and has the volume accounting for 24% of that of the acoustic regulating material.
< comparative example 1>
In this example, the acoustic conditioning material and speaker module are consistent with the embodiments. Wherein the expandable polyethylene 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 1-comparative table of F0 for three micro speaker modules
| Comparative example 2 | Comparative example 1 | Example 1 | |
| Micro speaker module F0 | 783 Hz | 786 Hz | 788 Hz |
As can be seen from table 1, the F0 differences between the three micro-speakers are small. This indicates that, in example 1, although the expandable polyethylene occupies a part of the space in the rear cavity after foaming, it does not affect the adsorption and desorption effects of the acoustic conditioning material on the vibrating gas.
TABLE 2-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 | 786 Hz | 925 Hz | 139 Hz | Severe particle breakage |
| Example 1 | 788 Hz | 792 Hz | 4 Hz | Without change |
As can be seen from table 2, 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 conditioning material includes an acoustic improving filler 15 and an expandable polyethylene 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 weight percentage of the expandable polyethylene filler is 1.5 percent.
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 filling, the microspeaker module was placed in an oven and heated at 100 ℃ for 20 minutes to foam the expandable polyethylene filler.
The foamed foam buffering filler has the physical size of 0.4-0.8 mm and the density of 0.08g/mL, and the volume of the foam buffering filler accounts for 9 percent of that of the acoustic adjusting material.
< comparative example 3>
In this example, the acoustic conditioning material and speaker module are consistent with the embodiments. Wherein the expandable polyethylene filler is not triggered.
< comparative example 4>
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 4 | Comparative example 3 | Example 2 |
| Micro speaker module F0 | 783 Hz | 786 Hz | 785 Hz |
As can be seen from table 3, the F0 differences for the three micro-speakers are small. This indicates that, in example 2, although the foam occupies a part of the cavity, the adsorption and desorption effects of the acoustic control material on the vibrating 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 4 | 786 Hz | 925 Hz | 139 Hz | Severe particle breakage |
| Example 2 | 785 Hz | 821 Hz | 36 Hz | Partial particle crushing |
As can be seen from table 4, after the reliability test, the F0 of the micro-speaker module of example 2 was changed by 36 Hz, the sound-absorbing particles were partially broken, and the buffering effect was reduced, but the change of F0 was still much smaller than that of example 4.
This shows that the cushioning effect is reduced because the foam filler is less in the particles of the acoustic conditioning material, but the integrity of the particles of the acoustic conditioning material of this example is still higher and the effect of conditioning low frequencies is better than that of example 4.
< example 3>
The acoustic conditioning material includes an acoustic improving filler 15 and an expandable polypropylene filler. The acoustic modifying filler is silica. The silicon dioxide is granular, the physical size is 0.2mm-0.8mm, and the density is 0.6 g/mL. . The mass fraction of the expandable polypropylene filler is 25 percent.
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 filling, the microspeaker module was placed in an oven and heated at 100 ℃ for 30 minutes to foam the expandable polyethylene filler.
The physical size of the foam cushion filler after foaming was 20mm, the density was 0.07g/mL, and the volume of the foam cushion filler was 55% of the volume of the acoustic material-filled mixture.
< comparative example 5>
In this example, the acoustic conditioning material and speaker module are consistent with the embodiments. Wherein the expandable polypropylene filler is not triggered.
< comparative example 6>
The material of the acoustic adjusting material is silicon dioxide. The silicon dioxide is granular, the physical size is 0.2mm-0.8mm, and the density is 0.6 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 5-comparative table of F0 for three micro speaker modules
| Acoustic conditioning material | Comparative example 6 | Comparative example 5 | Example 3 |
| Micro speaker module F0 | 783 Hz | 789 Hz | 782 Hz |
As can be seen from table 5, F0 for the speaker of example 3 is very small compared to comparative examples 5 and 6. This shows that in this example 3, although the acoustic improving filler content is small, the performance of the acoustic adjusting material for adjusting low frequencies can be substantially unaffected.
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 6 | 786 Hz | 933 Hz | 147 Hz | Severe particle breakage |
| Example 3 | 782Hz | 786 Hz | 4 Hz | Without change |
As can be seen from table 6, after the reliability test was performed, F0 of the micro-speaker module of this example 3 was changed by 4 Hz, and the particles were not changed; the F0 for the microspeaker module of comparative example 6 varied 147Hz and the particles were severely broken.
This shows that the reliability of the acoustic conditioning material of this embodiment is significantly due to the acoustic conditioning material of comparative example 6.
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.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (21)
1. An acoustic conditioning material, comprising: the acoustic improvement filler comprises an expandable polyolefin filler and an acoustic improvement filler, wherein the expandable polyolefin 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 volume of the expanded expandable polyolefin filler is changed along with the change of temperature and/or foaming time, the damping of the expandable polyolefin filler is increased when the temperature is increased, and the buffer capacity of the expandable polyolefin filler is enhanced.
2. The acoustic conditioning material of claim 1, wherein the expandable polyolefin filler contains olefin chain units in its molecular chain, and the molecular structure of the olefin chain units comprises at least one of-CH 2-CH2-, -CH (R) -CH2-, and-CH (R) -wherein R is an alkyl group.
3. The acoustic conditioning material of claim 2, wherein the expandable polyolefin filler is polymerized from one or more of ethylene, propylene, butene, pentene, hexene.
4. 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.
5. The acoustic conditioning material of claim 1, wherein the expandable polyolefin filler is spherical, spheroidal, rod-like, cylindrical, square, or radial.
6. The acoustic conditioning material of claim 1, wherein the expandable polyolefin filler has a density of 0.005g/mL to 0.7g/mL after foaming.
7. The acoustic conditioning material of claim 1, wherein the expandable polyolefin filler is in particulate form and, after foaming, has a physical size of 0.1mm to 25 mm.
8. The acoustic conditioning material of claim 1, wherein the expandable polyolefin filler comprises a polymeric polyolefin material and a blowing agent mixed together, wherein the blowing agent comprises a low boiling alkane.
9. The acoustic conditioning material of claim 1, wherein the expandable polyolefin 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 polyolefin 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 expandable polyolefin filler comprises 0.1% -15% of the total volume of the acoustic conditioning material prior to foaming; after foaming, the volume of the foam cushion filler accounts for 5% -55% of the total volume of the acoustic conditioning material.
12. An acoustic conditioning material according to any of claims 1-11, characterised in that after foaming the foam cushioning filler formed by the expandable polyolefin filler provides a cushioning effect to the acoustic improvement filler upon a moving impact.
13. The acoustic conditioning material of claim 1, wherein the foaming process of the expandable polyolefin 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 45% -95% in the filling region prior to foaming.
17. The sound-emitting device according to claim 15, wherein the expandable polyolefin filler and the acoustic enhancement filler are both particulate materials,
the expandable polyolefin filler is mixed with the acoustic improvement filler and filled in the filling area.
18. The sound-emitting device according to claim 15, wherein the expandable polyolefin filler and the acoustic enhancement filler are both block-shaped materials,
the expandable polyolefin filler is arranged alternately with the acoustic improvement filler; or the block-shaped expandable polyolefin filler and the block-shaped acoustic improvement filler in the same layer are distributed in an array, and the expandable polyolefin filler and the acoustic improvement filler are arranged in an interlaced manner.
19. The sound-emitting device according to claim 15, wherein the expandable polyolefin filler forms a lattice structure, and the acoustic improvement filler is filled in gaps formed by the expandable polyolefin filler; or
The acoustic improvement filler forms a lattice structure, and the expandable polyolefin filler is filled in gaps formed by the acoustic improvement filler.
20. A method of filling an acoustic conditioning material for a sound generating device, wherein the acoustic conditioning material of any of claims 1-14 is disposed in a filling area of a rear acoustic cavity of the sound generating device in any of the following ways:
the acoustic adjusting material is granular, and the filling area is filled with expandable polyolefin filler firstly, and then filled with acoustic improving filler;
the acoustic adjusting material is granular, and firstly, acoustic improving filler is filled into the filling area, and then expandable polyolefin filler is filled into the filling area;
the acoustic adjusting material is granular, the expandable polyolefin filler and the acoustic improving filler are mixed firstly, and then the mixed expandable polyolefin filler and acoustic improving filler are filled into a filling area;
an expandable polyolefin filler is first arranged in at least one wall portion of the filling zone to form an expandable polyolefin filler layer, and then an acoustic improvement filler is filled into the filling zone.
21. An electronic device, characterized in that it comprises a sound-emitting device according to any one of claims 15-19.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010660118.2A CN111560133A (en) | 2020-07-10 | 2020-07-10 | Acoustic adjusting material, filling method, sound production device and electronic equipment |
| PCT/CN2020/136712 WO2022007332A1 (en) | 2020-07-10 | 2020-12-16 | Acoustic adjusting material, filling method, sound generating device and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010660118.2A CN111560133A (en) | 2020-07-10 | 2020-07-10 | Acoustic adjusting material, filling method, sound production device and electronic equipment |
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| CN111560133A true CN111560133A (en) | 2020-08-21 |
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| CN202010660118.2A Pending CN111560133A (en) | 2020-07-10 | 2020-07-10 | Acoustic adjusting material, filling method, sound production device and electronic equipment |
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| Country | Link |
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| CN (1) | CN111560133A (en) |
| WO (1) | WO2022007332A1 (en) |
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| WO2022007333A1 (en) * | 2020-07-10 | 2022-01-13 | 歌尔股份有限公司 | Acoustic adjustment material, filling method, sound generating apparatus, and electronic device |
| WO2022007335A1 (en) * | 2020-07-10 | 2022-01-13 | 歌尔股份有限公司 | Acoustic adjusting material, sound production apparatus, and electronic device |
| WO2022007336A1 (en) * | 2020-07-10 | 2022-01-13 | 歌尔股份有限公司 | Acoustic conditioning material, sound production apparatus, filling method, and electronic device |
| WO2022007332A1 (en) * | 2020-07-10 | 2022-01-13 | 歌尔股份有限公司 | Acoustic adjusting material, filling method, sound generating device and electronic device |
| WO2022007331A1 (en) * | 2020-07-10 | 2022-01-13 | 歌尔股份有限公司 | Acoustic adjusting material, filling method, sound production apparatus, and electronic device |
| WO2022007334A1 (en) * | 2020-07-10 | 2022-01-13 | 歌尔股份有限公司 | Acoustic adjusting material for sound production apparatus, sound production apparatus, filling method and electronic device |
| CN115209335A (en) * | 2022-09-14 | 2022-10-18 | 歌尔股份有限公司 | Casing of sound generating device, sound generating device and electronic equipment |
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Application publication date: 20200821 |