CN111560145A - 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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- CN111560145A CN111560145A CN202010660139.4A CN202010660139A CN111560145A CN 111560145 A CN111560145 A CN 111560145A CN 202010660139 A CN202010660139 A CN 202010660139A CN 111560145 A CN111560145 A CN 111560145A
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Classifications
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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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- 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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- 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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- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified 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
- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
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- C08J2325/04—Homopolymers or copolymers of styrene
- C08J2325/06—Polystyrene
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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
- 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 expandable high molecular polymer filler containing the styrene chain links foams under the triggered condition to form foam buffer filler so as to provide a buffer effect for the acoustic improvement filler during moving collision, the volume of the expandable high molecular polymer filler containing the styrene chain links after foaming changes along with the change of temperature and/or foaming time, the damping is increased when the temperature rises, and the buffer capacity is enhanced. 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, 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 to can reduce the removal of acoustics filler, so as not to produce and flow and make an uproar (0007 section). However, when triggered by expansion, the expandable filler is permanently expanded from an initial first size to a fixed second size, the size is not changed any more, the size is also constant in the application process, the expansion degree of the expandable filler cannot be effectively adjusted according to different use environmental conditions, and 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 for a sound generating device. The acoustic conditioning material includes: the acoustic improvement filler comprises an expandable high polymer filler containing styrene chain links and an acoustic improvement filler, wherein the expandable high polymer filler containing styrene chain links is foamed under a triggered condition to form a foam buffer filler so as to buffer the movement of the acoustic improvement filler, and the foamed volume of the expandable high polymer filler containing styrene chain links is changed along with the change of temperature and/or foaming time.
Optionally, the molecular chain of the expandable high molecular polymer filler containing styrene chain units contains styrene chain units, and the molecular structure of the styrene chain units is-CH (C6H5) -CH 2-.
Optionally, the expandable high molecular polymer filler containing styrene units comprises at least one high molecular polymer of expandable polystyrene, acrylonitrile-butadiene-styrene copolymer and styrene-butadiene-styrene block copolymer.
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 high molecular polymer filler containing styrene chain units is in the form of particles, sheets or blocks.
Optionally, the expandable high molecular polymer filler containing styrene units has a density of 0.005g/mL to 0.5g/mL after foaming.
Optionally, the expandable high molecular polymer filler containing styrene chain units is in a granular shape, and after foaming, the physical size of the expandable high molecular polymer filler containing styrene chain units is 0.1mm-20 mm.
Optionally, the expandable high-molecular polymer filler containing styrene units comprises a high-molecular polymer material and a foaming agent mixed together, wherein the foaming agent comprises low-boiling alkane.
Optionally, the expandable high molecular polymer filler containing styrene units is triggered by at least one of thermal radiation, optical radiation, electromagnetic radiation.
Optionally, before foaming, the expandable high molecular polymer filler containing styrene chain links accounts for 0.01% -30% of the total volume of the acoustic adjusting material; after foaming, the volume of the foam cushion filler accounts for 0.05-60% of the total volume of the acoustic conditioning material.
Optionally, before foaming, the expandable high molecular polymer filler containing styrene chain links accounts for 0.1% -10% of the total volume of the acoustic adjusting material; after foaming, the volume of the foam cushion filler accounts for 5% -50% of the total volume of the acoustic conditioning material.
Optionally, after foaming, the acoustic improvement filler is cushioned by a foam cushion filler formed of the styrene-mer containing expandable high molecular weight polymer filler.
Optionally, the expandable high molecular polymer filler containing styrene units increases in volume by 2 to 150 times after foaming.
Alternatively, the expandable polymeric filler containing styrene units increases in volume by a factor of 3 to 100 after foaming.
Optionally, the foaming process of the expandable high molecular polymer filler containing styrene chain units comprises 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.
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 sound generating mechanism's acoustics adjusting material, the inside formation cavity of casing, the cavity includes the back vocal chamber, sound production monomer sets up in the cavity, sound production monomer with back vocal chamber intercommunication, the back vocal chamber 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 40% -95%.
Optionally, the expandable high molecular polymer filler containing styrene chain units and the acoustic improvement filler are both granular materials,
the expandable high molecular polymer filler containing styrene chain links is mixed with the acoustic improvement filler and filled in the filling area.
Optionally, the expandable high molecular polymer filler containing styrene chain links and the acoustic improvement filler are both bulk materials,
the expandable high polymer filler containing styrene chain links and the acoustic improvement filler are alternately arranged; or the blocky expandable high molecular polymer filler containing the styrene chain links and the blocky acoustic improvement filler in the same layer are distributed in a matrix manner, and the expandable high molecular polymer filler containing the styrene chain links and the acoustic improvement filler are arranged in an interlaced manner.
Optionally, the expandable high molecular polymer filler containing styrene chain links forms a grid structure, and the acoustic improvement filler is filled in gaps formed by the expandable high molecular polymer filler containing styrene chain links; or the acoustic improvement filler forms a grid structure, and the expandable high polymer filler containing styrene chain links 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 an expandable high polymer filler containing styrene chain links is filled into the filling area, and then an acoustic improving filler is filled into the filling area;
the acoustic adjusting material is granular, acoustic improving filler is filled into the filling area, and then expandable high polymer filler containing styrene chain links is filled into the filling area;
the acoustic adjusting material is granular, the expandable high polymer filler containing styrene chain links and the acoustic improving filler are mixed, and then the mixed expandable high polymer filler containing styrene chain links and the acoustic improving filler are filled into the filling area;
the method comprises the steps of firstly arranging expandable high polymer filler containing styrene chain links on at least one wall part of the filling area to form the expandable high polymer filler layer containing the styrene chain links, and then filling the acoustic improvement filler into the filling area.
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, the acoustic conditioning material includes an expandable high molecular polymer filler containing styrene units and an acoustic improvement filler. After being triggered, the expandable high polymer filler containing styrene chain links foams to form foam, and the foam provides buffer effect for the flowing and collision of the acoustic improvement filler. In the working process of the sound production device, the expandable high polymer filler containing the styrene chain link greatly reduces the risk of breaking the filler by acoustic improvement, and improves the durability and 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 a matrix distribution of bulk acoustic conditioning material in an unfoamed state 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 high-molecular polymer filler containing styrene chain units; 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: an expandable high-molecular polymer filler 14 containing styrene units and an acoustic improving filler 15. The expandable high molecular polymer filler 14 containing styrene chain units is foamed under the triggered condition to become foam cushion filler so as to cushion the movement of the acoustic improvement filler 15, and the foaming volume of the expandable high molecular polymer filler 14 containing styrene chain units is changed along with the change of temperature and/or foaming time.
The degree of cushioning of the acoustic improvement filler 15 during a moving collision can be flexibly controlled by the temperature and time for foaming the expandable high molecular polymer filler 14 containing styrene units. When the expandable high molecular polymer filler 14 containing styrene units is foamed, the temperature is increased, the damping of the expandable high molecular polymer filler 14 containing styrene units is increased, and the buffering capacity of the expandable high molecular polymer filler 14 containing styrene units is enhanced. 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 sound generating 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 probability 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 expandable high-molecular polymer filler 14 containing styrene units is a polymer material that can be expanded under a set trigger condition. In the non-triggered condition, expandable polymer filler 14 containing styrene units has a small 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.
The molecular chain of the expandable high polymer filler containing styrene chain units contains styrene chain units, and the molecular structure of the styrene chain units is-CH (C6H5) -CH 2-. The expandable high-molecular polymer filler containing styrene chain links comprises at least one high-molecular polymer of expandable Polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS) and styrene-butadiene-styrene block copolymer (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 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 improving filler 15 may be in the form of particles, flakes, blocks, or the like.
Specifically, the expandable high molecular polymer filler containing styrene chain links is spherical, spheroidal, rod-shaped, cylindrical, square or radial. The filling effect of the shape is good, and the filling rate is high.
In the disclosed embodiment, the acoustic adjusting material includes an expandable high-molecular polymer filler 14 containing styrene units and an acoustic improving filler 15. The expandable polymer packing 14 containing styrene units is foamed under a triggered condition to become a foam cushion packing to cushion the movement of the acoustic improvement packing 15. The acoustic enhancement filler 15 is less likely to collide during operation of the sound generating apparatus. In this way, the expandable high-molecular polymer filler 14 containing styrene units greatly reduces the risk of breakage of the acoustic improving filler 15, and improves the durability and service life of the acoustic adjusting material.
In addition, the expandable polymer filler 14 containing styrene units forms cells after foaming. The expandable high-molecular polymer material containing styrene units has elasticity, and the cells can change volume according to the change of external pressure, thereby providing a buffer effect on the movement of the acoustic improvement filler 15. In this way, the expandable polymer filler 14 containing styrene units can effectively buffer the flow and collision of the acoustic improving filler 15.
In particular, when the sound generating device is operated at high power, the expandable high molecular polymer filler 14 containing styrene chain links can effectively buffer the vibration of the acoustic adjusting material.
In addition, when the sound generating device is impacted by external force, the cells provide buffering force for the acoustic improvement filler 15, and gas in the cells is subjected to stagnation and compression, so that external energy is consumed and dissipated. The cells gradually terminate the impact load at a small negative acceleration, and therefore, the expandable high-molecular polymer filler 14 containing styrene units has a good shock-proof effect.
In addition, the different triggering temperatures enable the expandable high molecular polymer filler 14 containing styrene chain links to change the foaming volume, so as to adapt to different application environments, and the acoustic adjusting material has stronger weather resistance and adaptability.
In one example, the expandable polymer filler 14 containing styrene units comprises expandable polymer material containing styrene units and a blowing agent mixed together, wherein the blowing agent comprises 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 styrene 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 styrene chain links is polymerized together and mixed with the foaming agent. The method has simple process, and the expandable high polymer filler 14 containing styrene chain units can be formed by one-time reaction.
Or polymerizing the expandable high-molecular material containing the styrene chain links into the expandable high-molecular polymer material containing the styrene chain links, and then adding the foaming agent into the expandable high-molecular polymer material containing the styrene chain links to enable the foaming agent to permeate into the expandable high-molecular polymer material containing the styrene chain links.
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 inside the expandable high molecular polymer material containing styrene units. 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 high molecular polymer filler 14 containing styrene units is at least one of expandable PS and high molecular polymers such as ABS and SBS. The expandable high molecular polymer filler 14 containing styrene chain links can be foamed in volume under the set triggering condition, so that the movement of the acoustic improvement filler 15 is buffered.
For example, expandable polystyrene includes polystyrene and a blowing agent mixed together.
The expandable polystyrene filler has the characteristics of light weight, no water absorption, ageing 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 polymer filler 14 containing styrene units is in the form of particles or sheets. These materials have good fluidity and can be easily filled in a cavity.
The expandable high molecular polymer filler 14 containing styrene chain links in granular or sheet form can be directly filled into the filling area of the rear sound cavity 16 of the sound generating device.
The expandable high molecular polymer filler 14 containing styrene chain units in a granular or sheet-like form 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 one of the expandable polymer filler 14 containing styrene units and the sound-improving filler 15 is prepared in a predetermined three-dimensional structure, and the other is filled in the gaps of the three-dimensional structure in a granular or lamellar form.
In one example, the expandable polymer filler 14 containing styrene units is in the form of particles. After foaming, the expandable polymer filler 14 containing styrene units has a physical size of 0.1mm to 20 mm.
In this size range, the expandable high-molecular polymer filler 14 containing styrene units has a good buffering effect on the acoustic improving filler 15, and the cells have a good buffering effect.
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 polymer filler containing styrene units is in the form of particles, and after foaming, the physical size of the expandable polymer filler 14 containing styrene units is 0.5mm to 2 mm. Within this range, the cushioning effect of the acoustic improving filler by the cells formed by the expandable high molecular polymer filler 14 containing styrene units is more excellent.
In one example, the expandable high molecular weight polymer filler 14 containing styrene units has a density of 0.2g/mL to 1.5g/mL when the filler is not foamed. 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 high-molecular polymer filler 14 containing styrene units has a density of 0.5g/mL to 1.0g/mL, within which the acoustic adjusting material has a small influence on the overall weight of the sound emitting apparatus.
In one example, the expandable polymeric filler containing styrene units has a density of 0.005g/mL to 0.5g/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 density of the expandable high molecular polymer filler containing styrene units is 0.01g/mL-0.05 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 polymer filler 14 containing styrene units is activated by at least one of thermal radiation, optical radiation, and electromagnetic radiation. Under the above radiation conditions, the foaming agent in the expandable polymer filler 14 containing styrene units volatilizes and becomes larger in volume, and cells are formed in the expandable polymer material containing styrene units, thereby foaming the expandable polymer material containing styrene units.
Under the same temperature condition, under a certain trigger time, the volume of the expandable high molecular polymer filler 14 containing the styrene chain link can be increased to an appropriate value, and if the trigger time is too short, the foaming multiple of the expandable high molecular polymer filler 14 containing the styrene chain link is small, so that the expandable high molecular polymer filler 14 cannot play a role in buffering the acoustic improvement filler 15.
Under the same trigger time and a certain trigger temperature, the volume of the expandable high polymer filler 14 containing styrene chain units can be increased to a proper value, and the higher the temperature is, the more easily the cell breakage occurs; on the contrary, the lower the trigger temperature, the smaller the foaming volume of the expandable polymer filler 14 containing styrene units, and the function of the acoustic improvement filler 15 is not buffered.
In addition, cells in the expandable polymer filler 14 containing styrene units are not broken.
The foaming agent in expandable polymer filler 14 containing styrene units is triggered by ultraviolet irradiation during light irradiation. The foaming agent becomes larger in volume under the heated condition, so that cells are formed in the expandable high polymer filler containing styrene chain units.
When electromagnetic radiation is applied, the acoustic conditioning material is heated under the influence of the alternating magnetic field. The foaming agent is volatilized to form cells in the expandable polymer filler 14 containing styrene units.
The triggering mode is simple to operate, and the controllability of the size of the foam holes is strong.
Of course, the triggering manner of the expandable polymer filler 14 containing styrene units is not limited to the above-described embodiment, and those skilled in the art can select the triggering manner according to actual needs.
In one example, the expandable high molecular polymer filler containing styrene units is 0.01 to 30 percent of the total volume of the acoustic adjusting material before foaming; after foaming, the expandable high molecular polymer filler 14 containing styrene chain links accounts for 0.05% -60% of the volume ratio 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 high-molecular polymer filler 14 containing styrene chain links 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; on the contrary, the smaller the proportion of the expandable polymer filler 14 containing styrene units in the acoustic adjusting material is, the less the effect of buffering cannot be obtained.
In the above volume ratio range, although the filling amount of the acoustic improving filler 15 is relatively reduced, the expandable high molecular polymer filler 14 containing styrene units can form channels after foaming, so that the vibration gas can easily enter and exit the acoustic adjusting material, and the sound absorption 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 high molecular polymer filler 14 containing styrene units.
Further, before foaming, the expandable high polymer filler containing styrene chain links accounts for 0.1% -10% of the total volume of the acoustic adjusting material; after foaming, the volume of the foam cushion filler accounts for 5% -50% 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 polymer filler 14 containing styrene units accounts for 0.1 to 20% by mass of the total mass of the acoustic adjusting material. Within this range, a higher filling ratio in the cavity can be achieved with less expandable high-molecular polymer filler 14 containing styrene units.
In addition, the mass ratio of the expandable high molecular polymer filler 14 containing styrene chain links is low, so that the effects of the acoustic adjusting material in adsorbing and desorbing the vibrating gas are not affected.
Further, the mass of the expandable high-molecular polymer filler 14 containing styrene units accounts for 1% to 5% 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 a specific example, the foaming process of the expandable high molecular polymer filler 14 containing styrene units 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 expandable polymer filler 14 containing styrene units can be flexibly controlled by the stage foaming of expandable polymer filler 14 containing styrene units.
Under the trigger condition, the expandable high molecular polymer filler 14 containing styrene chain units has different foaming volumes with different temperatures and/or foaming 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.
Therefore, at the initial stage of filling, the expandable polymer 14 containing styrene units is foamed in the first stage, and the first foam cushion filler provides a certain cushion 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 high polymer filler 14 containing the styrene chain links is easier to continue foaming, the damping characteristic of the surface of the first foam buffer filler is further improved, and the buffer is provided for the collision of the acoustic improvement filler, 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, under the condition, the expandable high polymer filler 14 containing the styrene chain links can be subjected to foaming change in the second stage, the damping is enhanced, the buffering effect is improved, and the fragile phenomenon caused by the poor strength of the acoustic improvement filler is effectively avoided.
Specifically, referring to table 1, the foamed volume of the expandable polymer filler 14 containing styrene units changes with the change of the foaming temperature and/or the foaming time, and within a certain temperature range, the damping of the expandable polymer filler containing styrene units increases when the temperature rises, and the cushioning capacity of the expandable polymer filler containing styrene units is enhanced; in a certain temperature range, the damping of the expandable high polymer filler containing the styrene chain links is increased when the time is prolonged, and the buffering capacity of the expandable high polymer filler containing the styrene chain links is enhanced. Therefore, the foaming degree of the expandable polymer filler 14 containing styrene units 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 polymer filler 14 containing styrene units is applied to a sound emitting device, if the expandable polymer filler 14 containing styrene units has been expanded to the maximum expanded volume, the strength of the acoustic improvement filler 15 becomes weak during long-term use at high temperature, and there is still a risk of breakage. If the expandable high molecular polymer filler 14 containing the styrene chain links is subjected to the first foaming stage to obtain the first foam cushion filler, the first foam cushion filler is not foamed to the maximum foaming volume, at this time, the expandable high molecular polymer filler 14 containing the styrene chain links is applied to the sound generating device, and in the long-term high-temperature use process of the sound generating device, the expandable high molecular polymer filler 14 containing the styrene chain links is subjected to the second foaming stage at high temperature, and at this time, the expandable high molecular polymer filler 14 containing the styrene chain links can be foamed continuously, and after the volume of the expandable high molecular polymer filler 14 containing the styrene chain links is increased, the acoustic improvement filler 15 can be further buffered, so that the service life of the acoustic improvement filler 15 is ensured.
The expandable polymer filler 14 containing styrene units may frequently undergo a plurality of high-temperature foaming processes during long-term high-frequency use of the sound generating apparatus, and therefore, the second foaming stage herein may not only refer to one foaming stage, but also include a plurality of foaming stages. For example, when the sound generating device is operated for a long time and at a high power, the inside of the sound generating device generates a high temperature, and at this time, the expandable high polymer filler 14 containing the styrene chain unit can be subjected to a foaming stage, and when the sound generating device is operated for a long time and at a high power for a plurality of times, the expandable high polymer filler 14 containing the styrene chain unit 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 polymer filler 14 containing styrene units is foamed in the first stage, if the maximum foamed volume is not reached, the volume of the expandable polymer filler 14 containing styrene units after continuing the second stage foaming can be further increased.
In a specific embodiment, referring to Table 2, the expandable polymer filler 14 containing styrene units increases in volume with increasing temperature in the range of 80 to 100 ℃.
TABLE 2 volume as a function of temperature data for the second foaming stage of the expandable Material
Specifically, the physical size of the expandable polymer filler 14 containing styrene units may be equivalent to the physical size of the sound-improving filler 15 before foaming, which facilitates uniform mixing of the expandable polymer filler 14 containing styrene units and the sound-improving filler 15; it is also possible that the physical size of the expandable polymer filler 14 containing styrene units 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 high molecular polymer filler 14 containing styrene chain links has a significantly increased volume and a significantly decreased density, and can provide a significant buffer effect for the acoustic improvement filler 15 during moving collision.
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 50% -95% in the non-triggered condition. In this ratio range, the foaming of the expandable polymer filler 14 containing styrene units can provide a cushioning effect on the flow and collision of the acoustically improved filler.
Preferably, the filling rate of the acoustic conditioning material in the filling zone is 60% to 85% in the non-triggered condition. Within the range, after being triggered, the acoustic adjusting material can better play a buffering role, can provide buffering for the flowing and collision of the acoustic improving filler, and prevents the acoustic improving filler from being broken.
In one example, as shown in fig. 3 to 4, the expandable polymer filler 14 containing styrene units and the acoustic improvement filler 15 are both bulk materials. The expandable high-molecular polymer filler 14 containing styrene units is arranged alternately with the sound-improving filler 15. In this example, the expandable polymer filler 14 containing styrene units in the direction of alignment of the two fillers can effectively squeeze the acoustic improving filler 15, thereby allowing the acoustic improving filler 15 to effectively cushion.
In one example, as shown in fig. 5, the expandable polymer filler 14 containing styrene units and the acoustic improvement filler 15 in blocks in the same layer are distributed in a matrix, and the expandable polymer filler 14 containing styrene units and the acoustic improvement filler 15 are alternately arranged.
In this example, in the foamed state, the expandable polymer filler 14 containing styrene units 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 polymer filler 14 containing styrene units forms a lattice structure. The acoustic improvement filler 15 is filled in the gap 13 formed by the expandable high molecular polymer filler 14 containing styrene units.
Alternatively, the acoustic improvement filler 15 forms a lattice structure. An expandable high-molecular polymer filler 14 containing styrene units 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, filling the acoustic improvement filler 15 or the expandable high molecular polymer filler 14 containing styrene chain links in the gap 13 formed by the grid structure; next, the case 11 is closed; finally, the expandable polymer filler 14 containing styrene units is foamed by means of heat radiation or the like.
The above filling method can realize foaming of the expandable high polymer filler 14 containing styrene chain links after triggering, and further extrude the acoustic improvement filler 15, and form a buffering effect.
In one example, the expandable polymer filler containing styrene units increases in volume by 2 to 100 times after foaming. Thus, the foam cushion filler gives a good cushioning effect to the acoustic improvement filler 15.
Preferably, the expandable high-molecular polymer filler containing styrene units increases in volume by 3 to 50 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. 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:
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 expandable high molecular polymer filler 14 containing styrene units is filled into the filling zone, and then the acoustic improvement filler 15 is filled into the filling zone. 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 expandable high-molecular polymer filler 14 containing styrene units also employs particles of different physical sizes, so that the filling rate of the acoustic adjusting material in the filling zone is high.
It is also possible that the acoustic improving filler 15 and the expandable high polymer filler 14 containing styrene units both use particles of the same physical size to ensure the consistency of the acoustic adjusting material.
For example, the acoustic conditioning material is in particulate form. The acoustic improvement filler 15 is first filled into the filling zone, and then the expandable high molecular polymer filler 14 containing styrene units is 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 expandable high-molecular polymer filler 14 containing styrene units also employs particles of different physical sizes, so that the filling rate of the acoustic adjusting material in the filling zone is high.
For example, the acoustic conditioning material is in particulate form. The expandable high molecular polymer filler 14 containing styrene chain units and the acoustic improvement filler 15 are mixed, and then the mixed expandable high molecular polymer filler 14 containing styrene chain units and the acoustic improvement filler 15 are filled in the filling area.
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 expandable high-molecular polymer filler 14 containing styrene units also employs particles of different physical sizes, so that the filling rate of the acoustic adjusting material in the filling zone is high.
For example, as shown in fig. 3-4, an expandable polymer filler 14 containing styrene chain links is first disposed on at least one wall portion of the filling region to form an expandable polymer filler layer containing styrene chain links; 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. An expandable polymer filler 14 containing styrene units 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 high molecular polymer filler 14 of the wall portion containing styrene chain links is foamed, thereby pressing the acoustic improvement filler 15 to buffer the movement of the acoustic improvement filler 15. The foamed expandable high molecular polymer filler 14 containing styrene units has a buffering effect on the acoustic improvement filler 15.
Optionally, a packing layer of expandable high molecular polymer containing styrene chain links is formed on two opposite walls of the cavity. Under the triggered condition, the expandable high molecular polymer filler 14 containing styrene chain links of the two wall parts is foamed, so that the acoustic improvement filler 15 is extruded in two opposite directions, and the buffering effect of the foam cushion filler on the acoustic improvement filler 15 is better.
In addition, the expandable polymer filler layer containing styrene units after foaming provides a cushioning effect on opposite sides of the acoustic improving filler 15, which makes the acoustic adjusting material more durable.
Furthermore, an expandable high polymer filler layer containing styrene chain links is formed on all the wall parts of the cavity. In this way, the layer of expandable high-molecular polymer packing containing styrene units provides a cushioning effect in any direction of the acoustic improving packing 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 adjusting material includes an acoustic improving filler 15 and an expandable polystyrene filler. Wherein, the material of the acoustic improvement filler 15 is zeolite, the physical size is 0.3mm-0.5mm, and the density is 0.5 g/mL. The mass fraction of the expandable polystyrene filler is 3 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 the filling, the micro-speaker module was placed in an oven and heated at 100 ℃ for 20min to foam the expandable polystyrene filler.
The foam after foaming has a physical size of 1.5mm and a density of 0.02g/mL, and the volume of the foam is 20% of the volume of the acoustic material filling mixture.
< comparative example 1>
In this example, the acoustic conditioning material and speaker module are consistent with the embodiments. Wherein the expandable polystyrene filler is not triggered.
< comparative example 2>
The material of the acoustic adjusting material is zeolite, the physical size is 0.3mm-0.5mm, and the density is 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 | 786 Hz | 785 Hz | 783 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 foam occupies a partial volume of the rear chamber, the adsorption and desorption effects of the acoustic control material on the vibrating gas are not deteriorated.
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 | 933 Hz | 147 Hz | Severe particle breakage |
| Example 1 | 783 Hz | 792 Hz | 7 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 adjusting material includes an acoustic improving filler 15 and an expandable polystyrene filler. Wherein, the material of the acoustic improvement filler 15 is zeolite, the physical size is 0.3mm-0.5mm, and the density is 0.5 g/mL. The mass fraction of the expandable polystyrene filler is 3 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 the filling, the micro-speaker module was placed in an oven and heated at 100 ℃ for 20min to foam the expandable polystyrene filler.
The foam after foaming had a physical size of 0.4mm and a density of 0.03g/mL, and the volume of the foam was 8% of the volume of the acoustic material-filled mixture.
< comparative example 3>
In this example, the acoustic conditioning material and speaker module are consistent with the embodiments. Wherein the expandable polystyrene filler is not triggered.
< comparative example 4>
The material of the acoustic adjusting material is zeolite, the physical size is 0.3mm-0.5mm, and the density is 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 | 786 Hz | 785 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 | 933 Hz | 147 Hz | Severe particle breakage |
| Example 2 | 785 Hz | 824 Hz | 39 Hz | Partial particle crushing |
As can be seen from table 4, after the reliability test, F0 of the micro-speaker module of example 2 was changed to 39 Hz, and the sound-absorbing particles were partially broken, so that the buffering effect was reduced, and the acoustic performance of the micro-speaker module was affected.
This indicates that, since the expanded polystyrene particles are less in the particles of the acoustic adjusting material and cannot provide a sufficient cushioning effect to the sound-absorbing particles, a state in which part of the sound-absorbing particles are broken occurs.
< example 3>
The acoustic adjusting material includes an acoustic improving filler 15 and an expandable polystyrene filler. Wherein, the material of the acoustic improvement filler 15 is zeolite, the physical size is 0.3mm-0.5mm, and the density is 0.5 g/mL. The mass fraction of the expandable polystyrene filler is 0.5 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 the filling, the micro-speaker module was placed in an oven and heated at 100 ℃ for 20min to foam the expandable polystyrene filler.
The physical size of the foamed body after foaming became 20mm, the density was 0.09g/mL, and the volume of the foamed body was 48% 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 polystyrene filler is not triggered.
< comparative example 6>
The material of the acoustic adjusting material is zeolite, the physical size is 0.3mm-0.5mm, and the density is 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 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 | 786 Hz | 785 Hz | 813 Hz |
As can be seen from table 5, the F0 for the speaker of example 3 was 27 Hz lower than that of comparative example 6. This indicates that the expandable polystyrene in example 3 occupies a larger volume of the cavity after being expanded, which affects the low-frequency acoustic performance of the speaker module.
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 | 813 Hz | 818 Hz | 5 Hz | Particle discovery shape change |
As can be seen from table 6, after the reliability test, F0 of the micro-speaker module of example 3 was changed by 5 Hz, but the expanded polystyrene foam slightly affected the initial F0 of the micro-speaker module and caused a phenomenon in which the particles were deformed.
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 high polymer filler containing styrene chain links and an acoustic improvement filler, wherein the expandable high polymer filler containing styrene chain links 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 moves and collides, and the foamed volume of the expandable high polymer filler containing styrene chain links changes along with the change of temperature and/or foaming time.
2. The acoustic conditioning material of claim 1, wherein the expandable high polymer filler containing styrene units has styrene units in its molecular chain, and the molecular structure of the styrene units is-CH (C6H5) -CH 2-.
3. The acoustic conditioning material of claim 2, wherein the expandable high-molecular polymer filler containing styrene units comprises at least one high-molecular polymer of expandable polystyrene, acrylonitrile-butadiene-styrene copolymer, and styrene-butadiene-styrene block copolymer.
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 high molecular polymer filler containing styrene units is in the form of particles, flakes, or blocks.
6. The acoustic conditioning material of claim 1, wherein the expandable high polymer filler containing styrene units has a density of 0.005g/mL to 0.5g/mL after foaming.
7. The acoustic conditioning material of claim 1, wherein the expandable high-molecular polymer filler containing styrene units is in a granular form, and after foaming, the physical size of the expandable high-molecular polymer filler containing styrene units is 0.1mm to 20 mm.
8. The acoustic conditioning material of claim 1, wherein the expandable high molecular polymer filler containing styrene units comprises a high molecular polymer 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 high molecular polymer filler containing styrene units is triggered by at least one of thermal radiation, optical radiation, and electromagnetic radiation.
10. The acoustic conditioning material of claim 1, wherein the expandable high molecular polymer filler containing styrene units, before foaming, accounts for 0.01% -30% of the total volume of the acoustic conditioning material; after foaming, the volume of the foam cushion filler accounts for 0.05-60% of the total volume of the acoustic conditioning material.
11. The acoustic conditioning material of claim 1, wherein the expandable high molecular polymer filler containing styrene units, before foaming, accounts for 0.1% -10% of the total volume of the acoustic conditioning material; after foaming, the volume of the foam cushion filler accounts for 5% -50% of the total volume of the acoustic conditioning material.
12. An acoustic conditioning material according to any of claims 1-11, wherein the foam cushion filler formed of the expandable high molecular polymer filler containing styrene units provides a cushioning effect to the acoustic improvement filler upon moving impact after foaming.
13. The acoustic conditioning material of claim 1, wherein the foaming process of the expandable high polymer filler containing styrene units comprises a first foaming stage and a second foaming stage, the first foaming stage resulting in a first foam cushion filler and the 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 40% -95% in the filling region prior to foaming.
17. The sound-emitting device according to claim 15, wherein said expandable polymer filler containing styrene units and said acoustic improvement filler are both granular materials,
the expandable high molecular polymer filler containing styrene chain links is mixed with the acoustic improvement filler and filled in the filling area.
18. The sound-emitting device according to claim 15, wherein said expandable polymer filler containing styrene units and said acoustic improvement filler are both block-shaped materials,
the expandable high polymer filler containing styrene chain links and the acoustic improvement filler are alternately arranged; or the blocky expandable high molecular polymer filler containing the styrene chain links and the blocky acoustic improvement filler in the same layer are distributed in a matrix manner, and the expandable high molecular polymer filler containing the styrene chain links and the acoustic improvement filler are arranged in an interlaced manner.
19. The sound-emitting device according to claim 15, wherein the expandable polymer filler containing styrene units forms a lattice structure, and the acoustic improvement filler is filled in gaps formed by the expandable polymer filler containing styrene units; or
The acoustic improvement filler forms a grid structure, and the expandable high polymer filler containing styrene chain links 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 an expandable high polymer filler containing styrene chain links is filled into the filling area, and then an acoustic improving filler is filled into the filling area;
the acoustic adjusting material is granular, acoustic improving filler is filled into the filling area, and then expandable high polymer filler containing styrene chain links is filled into the filling area;
the acoustic adjusting material is granular, the expandable high polymer filler containing styrene chain links and the acoustic improving filler are mixed, and then the mixed expandable high polymer filler containing styrene chain links and the acoustic improving filler are filled into the filling area;
the method comprises the steps of firstly arranging expandable high polymer filler containing styrene chain links on at least one wall part of the filling area to form the expandable high polymer filler layer containing the styrene chain links, and then filling the acoustic improvement filler into the filling area.
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 |
|---|---|---|---|
| CN202010660139.4A CN111560145A (en) | 2020-07-10 | 2020-07-10 | Acoustic adjusting material, filling method, sound production device and electronic equipment |
| PCT/CN2020/136708 WO2022007331A1 (en) | 2020-07-10 | 2020-12-16 | Acoustic adjusting material, filling method, sound production apparatus, and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010660139.4A CN111560145A (en) | 2020-07-10 | 2020-07-10 | Acoustic adjusting material, filling method, sound production device and electronic equipment |
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| CN111560145A true CN111560145A (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010660139.4A Pending CN111560145A (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) | CN111560145A (en) |
| WO (1) | WO2022007331A1 (en) |
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| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
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| CN111560145A (en) * | 2020-07-10 | 2020-08-21 | 歌尔股份有限公司 | Acoustic adjusting material, filling method, sound production device and electronic equipment |
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| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
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| Publication number | Publication date |
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| WO2022007331A1 (en) | 2022-01-13 |
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Application publication date: 20200821 |