WO2024103562A1 - Matériau d'absorption de son, appareil de production de son et dispositif électronique - Google Patents

Matériau d'absorption de son, appareil de production de son et dispositif électronique Download PDF

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Publication number
WO2024103562A1
WO2024103562A1 PCT/CN2023/078110 CN2023078110W WO2024103562A1 WO 2024103562 A1 WO2024103562 A1 WO 2024103562A1 CN 2023078110 W CN2023078110 W CN 2023078110W WO 2024103562 A1 WO2024103562 A1 WO 2024103562A1
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Prior art keywords
sound
absorbing material
zeolite powder
powder particles
inorganic adhesive
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PCT/CN2023/078110
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English (en)
Chinese (zh)
Inventor
李春
潘泉泉
张成飞
刘春发
王翠翠
凌风光
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歌尔股份有限公司
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Publication of WO2024103562A1 publication Critical patent/WO2024103562A1/fr

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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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

Definitions

  • the present invention relates to the field of acoustic technology, and more specifically, to a sound absorbing material, a sound generating device and an electronic device.
  • porous materials such as activated carbon, zeolite powder, activated silica, porous alumina, molecular sieves, or mixtures prepared in specific types and proportions, etc.
  • the pore structure inside the porous material can quickly adsorb and desorb the gas in the back cavity of the speaker, thereby achieving a virtual increase in the resonance space of the acoustic back cavity of the speaker, thereby effectively reducing the resonance frequency F0 of the speaker and improving the low-frequency sensitivity of the speaker.
  • the particle size of the sound-absorbing powder particles in the prior art is relatively large, resulting in fewer bonding points between the sound-absorbing powder particles, and when adsorbing and desorbing air molecules, only the surface pore structure of the sound-absorbing powder particles plays a role, which not only affects the structural stability of the sound-absorbing material, but also makes the internal pore structure of the sound-absorbing powder particles unable to play its role, resulting in a waste of acoustic materials.
  • the purity of the material of the zeolite powder particles with a larger particle size is reduced, which reduces the regularity of the internal pore structure of the zeolite powder particles, thereby reducing the ability of the sound-absorbing material to adsorb and desorb air.
  • an object of the present invention is to provide a sound absorbing material, which has the advantages of high structural strength and good sound absorbing performance.
  • the present invention also provides a sound-generating device provided with the sound-absorbing material.
  • the present invention further provides an electronic device having the sound-generating device.
  • a sound absorbing material comprising:
  • Zeolite powder particles wherein the silicon-aluminum mass ratio of the zeolite powder particles is less than 200, the average particle size of the zeolite powder particles is less than 0.1 ⁇ m, and the specific surface area of the zeolite powder particles is greater than or equal to 300 m 2 /g; and the zeolite powder particles have an MFI crystal structure;
  • An inorganic adhesive wherein the inorganic adhesive is used to bond the plurality of zeolite particles into the sound absorbing material;
  • the sound absorbing material has a macroporous structure, and the pore volume of the macroporous structure accounts for 20% to 90% of the pore volume of the sound absorbing material;
  • the pore volume of the sound absorbing material is ⁇ 0.02 ml/g.
  • the crystallinity change rate of the zeolite powder particles is ⁇ 20%.
  • the zeolite powder has a skeleton density of 1.6 g/cm 3 to 1.9 g/cm 3 .
  • the inorganic adhesive is prepared from at least one of an inorganic salt, an inorganic acid, an inorganic base, a metal oxide, and a hydroxide.
  • the mass of the inorganic adhesive accounts for 1% to 20% of the total mass of the sound absorbing material.
  • the bulk density of the sound absorbing material is ⁇ 0.3 g/ml.
  • the sound absorbing material has a crushing resistance of ⁇ 0.4N.
  • the sound absorbing material is spherical, ellipsoidal, rod-shaped, square-shaped or irregular block-shaped;
  • the diameter of the sound absorbing material is 100 ⁇ m to 1000 ⁇ m.
  • the silicon to aluminum mass ratio of the zeolite powder is 150-200.
  • a sound generating device comprising:
  • a sound-emitting unit a housing and the sound-absorbing material described in the first aspect
  • the sound-emitting unit is arranged in the shell and cooperates with the shell to define a front sound cavity and a rear sound cavity, and the sound-absorbing material is filled in the rear sound cavity and/or the front sound cavity.
  • an electronic device comprising: the sound generating device according to the second aspect.
  • the sound-absorbing material is made of an inorganic adhesive with a silicon-aluminum mass ratio of less than 200, an average particle size of less than 0.1 ⁇ m, a specific surface area of 300 m 2 /g or more and a crystal structure of The zeolite powder particles of MFI are bonded into sound-absorbing materials.
  • the zeolite powder particles provided by the present invention have a small particle size, more contact points with the inorganic adhesive, and stronger bonding force between the zeolite powder particles, so that the overall structural strength of the formed sound-absorbing material is higher, and the zeolite powder particles with a silicon-aluminum mass ratio of less than 200 have more aluminum atoms, so that there are more negative charges in the zeolite powder particles, so that the zeolite powder particles can be better combined with the inorganic adhesive, further improving the structural strength of the sound-absorbing material and ensuring the acoustic effect of the sound-absorbing material.
  • the sound-absorbing material with a macroporous structure of 20% to 90% formed by zeolite powder with an average particle size of less than 0.1 ⁇ m and a pore volume of ⁇ 0.02 ml/g of the sound-absorbing material allows air to enter the interior of the material more smoothly from the surface of the zeolite powder, while ensuring the proportion of the microporous structure of the sound-absorbing material, improving the adsorption and desorption capacity of the sound-absorbing material for air, and increasing the utilization rate of the material inside the zeolite powder.
  • the specific surface area of zeolite powder ⁇ 300 m2 /g provides the sound-absorbing material with more pore structures, thereby improving the acoustic performance of the sound-absorbing material.
  • FIG1 is a schematic structural diagram of a sound-absorbing material provided by the present invention.
  • FIG. 2 is a sound-generating device filled with sound-absorbing material provided by the present invention.
  • FIG. 3 is an IMP curve of the fourth sound-generating device provided by the present invention.
  • FIG. 4 is an IMP curve of each sound-generating device provided in Example 1, Example 2 and the comparative example provided by the present invention.
  • a sound absorbing material 1 comprising: zeolite powder particles 11 and an inorganic adhesive; the silicon-aluminum mass ratio of the zeolite powder particles 11 is less than 200, the average particle size of the zeolite powder particles 11 is less than 0.1 ⁇ m, and the specific surface area of the zeolite powder particles 11 is ⁇ 300 m 2 /g; the zeolite powder particles 11 have an MFI crystal structure; the inorganic adhesive is used to bond a plurality of the zeolite powder particles 11 into the sound absorbing material 1; the sound absorbing material 1 has a macroporous structure 12, and the pore volume of the macroporous structure 12 accounts for 20% to 90% of the pore volume of the sound absorbing material 1; the pore volume of the sound absorbing material is ⁇ 0.02 ml/g.
  • a plurality of zeolite powder particles 11 having a silicon-aluminum mass ratio of less than 200, an average particle size of less than 0.1 ⁇ m, a specific surface area of ⁇ 300 m 2 /g, and an MFI crystal type are bonded into the sound absorbing material 1 by using an inorganic adhesive.
  • the silicon-aluminum mass is less than 200, so that the zeolite powder particles 11 have more aluminum atoms, that is, more negative charges, which increases the polar sites of the zeolite powder particles 11, so that the inorganic adhesive can be better bonded to it, and the particle strength of the sound absorbing material 1 can be improved, so that it can withstand vibrations of higher power intensity.
  • the silicon-aluminum mass ratio of the zeolite powder 11 is 150-200, such as 160, 175, 180, 190, etc.
  • the number of polar sites formed by the zeolite powder 11 within this range is more reasonable, which can not only make the bonding of each zeolite powder 11 more uniform through the inorganic adhesive, but also avoid the formation of too many polar sites, resulting in too much inorganic adhesive bonded to each zeolite powder 11, affecting the overall strength of the sound-absorbing material 1 or blocking the sound-absorbing material 1.
  • the average particle size of the zeolite powder 11 is less than 0.1 ⁇ m, its surface area is larger, so that the contact sites between the zeolite powder 11 and the inorganic adhesive are increased.
  • the zeolite powder 11 and the inorganic adhesive are bonded to form the whole of the sound-absorbing material 1, the zeolite powder 11 is densely stacked, and is firmly bonded to each other, not easy to break, and can withstand high-intensity destructive experiments.
  • the particle size of the traditional zeolite powder 11 is relatively large.
  • the present invention uses powder particles with a particle size of less than 0.1 ⁇ m, such as 0.01 ⁇ m, 0.02 ⁇ m, 0.05 ⁇ m, 0.08 ⁇ m, 0.09 ⁇ m, etc., so that the sound-absorbing material 1 formed can give full play to the role of the internal pore structure when adsorbing and desorbing air molecules, so that the utilization rate of the pore structure of the sound-absorbing material 1 is close to 100%, greatly improving its acoustic performance.
  • the pore volume of the macroporous structure 12 in the sound-absorbing material 1 bonded by the inorganic adhesive accounts for 20 to 90%, so that the proportion of other pore structures, especially the microporous structure, in the sound-absorbing material 1 can be guaranteed to be within a reasonable range to ensure the sound absorption effect of the sound-absorbing material 1, that is, the overall structural strength of the sound-absorbing material 1 is improved under the premise of ensuring the sound absorption performance of the sound-absorbing material 1.
  • the pore volume of the sound-absorbing material is controlled to be ⁇ 0.02 ml/g, such as 0.05 ml/g, 0.1 ml/g, 0.2 ml/g, 0.3 ml/g, 0.5 ml/g, etc., and the response speed of the sound-absorbing material 1 to the adsorption and desorption of air molecules is significantly increased, thereby providing a better sound absorption effect and reducing the resonant frequency of the sound-emitting device.
  • the pore volume of the sound-absorbing material 1 when the pore volume of the sound-absorbing material 1 is too low, that is, the number of pore structures inside the sound-absorbing material 1 is too small, the structural units for adsorption and desorption of air molecules are small, resulting in a decrease in the amount of air molecules adsorbed by the sound-absorbing material 1, affecting its sound absorption performance.
  • the pore volume of the sound-absorbing material 1 should not be too high, because if it is too high, it is easy to reduce the structural stability of the sound-absorbing material 1, reduce its structural strength and cause it to break.
  • the sound-absorbing material 1 bonded with an organic adhesive is prone to glue oxidation, aging, and other problems after long-term use in a high temperature and high humidity environment, or after long-term use, which can easily cause the sound-absorbing particles to break or the channels to be blocked.
  • the sound-absorbing particles are filled into the sound-generating device, the use and acoustic performance of the sound-generating device are affected.
  • the inorganic adhesive used in the present invention will not have the problem of decreased sound-generating bonding force with the extension of the use time or the high temperature and high humidity of the environment, further improving the strength of the sound-absorbing material 1, and the inorganic adhesive itself will form a channel structure after drying, which can further promote the improvement of the acoustic performance of the sound-absorbing material 1.
  • the zeolite powder 11 with the MFI crystal structure provides a pore structure that is more efficient in the adsorption and desorption of air molecules.
  • the zeolite powder 11 with the MFI crystal structure has a high degree of crystallinity, and the degree of crystallinity can be controlled to be ⁇ 90%, such as 95%, 96%, etc., which can make the pore structure of the zeolite powder 11 more regular, and the air molecules can enter and exit the sound-absorbing material 1 more smoothly, thereby improving its ability to adsorb and desorb air molecules, further increasing the utilization rate of the internal material of the sound-absorbing material 1, and making the acoustic performance of the sound-absorbing material 1 formed by bonding it better.
  • the crystallinity change rate of the zeolite powder particles 11 is ⁇ 20%.
  • the crystallinity change rate of the zeolite powder 11 refers to the ratio of the difference in crystallinity of the zeolite powder 11 before and after calcination within the above-mentioned temperature range to the crystallinity before calcination, which can reflect the structural stability of the zeolite powder 11 to a certain extent.
  • the sound-absorbing material in the present invention has good structural regularity and structural stability.
  • the crystallinity change rate of the zeolite powder after calcination at a temperature above 600°C is ⁇ 20%, thereby ensuring the regularity of the internal pores and the sound-absorbing effect of the sound-absorbing material.
  • the skeleton density of the zeolite powder particles 11 is 1.6 g/cm 3 to 1.9 g/cm 3 .
  • skeleton density refers to the mass of the unit "actual volume of solid matter (excluding internal voids, i.e., excluding open pores, closed pores, and voids between particles)" of the material in a dense state.
  • the skeleton density of the zeolite powder 11 has a certain influence on the structural strength of the zeolite powder 11 itself.
  • the zeolite powder 11 with a skeleton density in the range of 1.6 g/cm 3 to 1.9 g/cm 3 is selected, for example, 1.7 g/cm 3 , 1.8 g/cm 3 , etc., can prevent excessive pore structures in the zeolite powder 11 from affecting its structural strength, and ensure that the zeolite powder 11 is not easily broken.
  • the inorganic adhesive is prepared from at least one of an inorganic salt, an inorganic acid, an inorganic base, a metal oxide, and a hydroxide.
  • the inorganic adhesive can be silicate sol, aluminate sol, phosphate sol, borate sol, sulfate sol, magnesium aluminum silicate sol, various metal oxide sols, etc., and the present invention does not limit this.
  • the above inorganic adhesives all have good bonding properties, and have a pore structure after drying, which is beneficial to the sound absorption effect of the sound-absorbing material 1.
  • the mass of the inorganic adhesive accounts for 1% to 20% of the total mass of the sound absorbing material 1 .
  • the use of inorganic adhesives can, on the one hand, improve the bonding force between the zeolite powder particles 11, and the bonding force will not decrease over time. On the other hand, after drying, it will form a pore structure, which is beneficial to the sound absorption performance of the sound-absorbing material 1. In practical applications, too little addition of inorganic adhesives will lead to insufficient bonding between the zeolite powder particles 11, resulting in the formed sound-absorbing material 1 being easily broken. At the same time, the addition of inorganic adhesives should not be too much, otherwise it will cover the zeolite powder particles 11 and affect the sound absorption effect of the sound-absorbing material 1. In this embodiment, the addition of inorganic adhesives is limited to 1% to 20%, which can take into account both the strength and sound absorption performance of the sound-absorbing material 1.
  • the effect of the amount of inorganic adhesive added on the crushing resistance of the sound-absorbing material 1 will increase with the increase of the amount of addition.
  • the mass of the inorganic adhesive is limited to 3% to 10% of the total mass of the sound-absorbing material 1, such as 3%, 4%, 5%, 6%, 7%, 8%, etc., which can avoid the problem of excessive inorganic adhesive occupying the space of the zeolite powder 11 and reducing the sound absorption effect of the sound-absorbing material 1.
  • the strength of the inorganic adhesive is lower than that of the zeolite powder 11. Too much inorganic adhesive will affect the overall strength of the sound-absorbing material 1.
  • the inorganic adhesive within this range can ensure that the crushing resistance of the sound-absorbing material 1 can reach more than 0.4N, and the sound absorption performance is improved.
  • the bulk density of the sound absorbing material 1 is ⁇ 0.3 g/ml.
  • the particle size of the zeolite powder 11 will affect its own bulk density. After it is bonded into the sound-absorbing material 1, it will also affect the bulk density of the sound-absorbing material 1.
  • the bulk density of the sound-absorbing material 1 will affect the performance of the air adsorption and desorption. It can be understood that the particle size of the zeolite powder 11 is larger, and the bulk density of the sound-absorbing material 1 formed is smaller. In practical applications, the smaller bulk density makes the filling mass relatively smaller when the sound-absorbing material 1 is filled in a certain volume. The performance of reducing the resonant frequency of the sound-generating device is weakened.
  • the average particle size of the zeolite powder is less than 0.1 ⁇ m
  • the bulk density of the sound-absorbing material 1 is set to be greater than or equal to 0.3 g/ml, such as 0.5 g/ml, 0.6 g/ml, 1 g/ml, etc., which can ensure the sound-absorbing performance of the sound-absorbing material 1 when it is filled in the sound-generating device.
  • the sound absorbing material 1 has an anti-crushing force of ⁇ 0.4N.
  • the sound-absorbing material 1 of the present invention is formed by bonding zeolite powder particles 11 with a silicon-aluminum mass ratio of less than 200, an average particle size of less than 0.1 ⁇ m, and a crystal structure of MFI with an inorganic adhesive, the sound-absorbing material 1 has a higher structural strength, and the higher structural strength enables the sound-absorbing material 1 to have a stronger crushing resistance.
  • the crushing resistance of the sound-absorbing material 1 is limited to greater than or equal to 0.4N, such as 0.5N, 1N, 2N, etc.
  • the specific value can be set according to the working requirements of the applicable sound-emitting device, which can ensure that the sound-absorbing material 1 has a suitable strength range during the operation of the sound-emitting device, avoid the problems of breakage and powdering of the sound-absorbing material 1 during operation, and improve the acoustic performance of the sound-emitting device.
  • the sound absorbing material 1 is spherical, ellipsoidal, rod-shaped, square-shaped or irregularly block-shaped; when the sound absorbing material 1 is spherical, the diameter of the sound absorbing material 1 is 100 ⁇ m to 1000 ⁇ m.
  • the sound-absorbing material 1 can use an inorganic adhesive to bond the zeolite powder 11 into a desired shape such as granules or blocks according to actual needs.
  • the sound-absorbing material 1 is bonded into spherical particles, and its diameter is limited to 100 ⁇ m to 1000 ⁇ m, such as 110 ⁇ m, 120 ⁇ m, 150 ⁇ m, 200 ⁇ m, 400 ⁇ m, 500 ⁇ m, 800 ⁇ m, etc., so that when the sound-absorbing material 1 is filled in the rear sound cavity 101 of the sound-emitting device, it has a suitable filling amount to improve its sound absorption performance.
  • the irregular block shape can be a covering block shape that matches the shape of the rear sound cavity 101 of the sound-emitting device, which can further enhance the structural strength of the sound-absorbing material 1.
  • a sound-emitting device comprising: a sound-emitting unit 20, a housing 10, and a sound-absorbing material 1 according to an embodiment of the first aspect of the present invention; the sound-emitting unit 20 is arranged in the housing 10 and cooperates with the housing 10 to define a front sound cavity 102 and a rear sound cavity 101, and the sound-absorbing material 1 is filled in the rear sound cavity 101 and/or the front sound cavity 102.
  • the sound-absorbing material 1 can be filled in the front sound cavity 102 or in the rear sound cavity 101.
  • the damping in the front sound cavity 102 can be increased, thereby This can reduce the distortion peak of the sound-generating device and effectively suppress the harmonic distortion and high-frequency noise caused by high-order resonance.
  • the sound-absorbing material 1 is filled in the rear sound cavity 101, the macropores, mesopores and micropores in the sound-absorbing material 1 can achieve a good sound-absorbing effect, increase the virtual volume of the rear sound cavity 101, and thus improve the low-frequency effect of the sound-generating device.
  • the sound-absorbing material 1 provided by the first aspect of the present invention is filled into the front sound cavity 102 and/or the rear sound cavity 101 of the sound-emitting device.
  • the sound-absorbing material 1 provided by the present invention has high strength and high environmental tolerance, so that it is not easy to break when filled in the sound-emitting device during use, and the sound-absorbing material 1 is prevented from powdering and affecting the acoustic performance of the acoustic device.
  • the sound-absorbing material 1 provided by the present invention has a higher sound-absorbing effect, further improving the sound effect of the sound-emitting device.
  • the sound-absorbing material 1 can be made into granules and filled in the sound-emitting device, or it can be made into a block material matching the front sound cavity 102 or the rear sound cavity 101 of the sound-emitting device and placed in the sound-emitting device. It can be made according to actual needs, and the present invention does not limit this.
  • an electronic device comprising: a sound-generating device according to an embodiment of the second aspect of the present invention.
  • the sound-generating device provided in the second aspect of the present invention can be set in an electronic device to achieve the sound-generating performance of the electronic device.
  • the sound-generating device provided by the present invention has a better acoustic effect and improves the acoustic function of the electronic device.
  • the electronic device can be a mobile phone, a laptop computer, a tablet computer, a VR (virtual reality) device, an AR (augmented reality) device, a TWS (true wireless Bluetooth) headset, a smart speaker, etc., and the present invention does not limit this.
  • the present invention specifically provides the following embodiments and comparative examples to specifically illustrate the technical scheme.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the sound absorbing material 1 provided in this embodiment includes zeolite powder and an inorganic binder, wherein the inorganic binder is silica sol, the zeolite powder is ZSM-5, the silicon-aluminum mass ratio of the zeolite powder is 160, the average particle size is 0.05 ⁇ m, and the zeolite powder has an MFI crystal structure.
  • the specific preparation process is as follows:
  • the first step 30 g of the above-mentioned ZSM-5 zeolite powder 11 is taken and dispersed in 70 g of deionized water to prepare a slurry, and 3 g of silica sol is added to the slurry to mix the slurry evenly.
  • zeolite powder 11 as the main sound absorbing material 1 is dispersed in deionized water, and silica sol as an inorganic adhesive can play a bonding role for the zeolite powder 11 dispersed in the deionized water.
  • 1g of dispersant can be added at the same time.
  • the slurry mixed evenly in the first step is made into a granular material by spray drying, that is, a plurality of zeolite particles 11 are initially formed into a granular material from a slurry state under the action of an inorganic adhesive.
  • the granular material in the second step is placed in an oven and baked at a temperature of 80°C to 120°C.
  • the material is placed in a muffle furnace and calcined at a temperature of 200°C to 800°C to obtain a granular sound-absorbing material 1.
  • the pore volume of the macroporous structure 12 in the granular sound absorbing material 1 obtained in the third step accounts for 30% of the pore volume of the sound absorbing material 1, the specific surface area of the zeolite particles is 350m2 /g; and the pore volume of the sound absorbing material is 0.05ml/g.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • Example 1 Take a half-open shell, load the granular sound-absorbing material 1 in Example 1 into the shell, and then package the open side of the shell with non-woven fabric to form a sound-absorbing material 1 packaging structure filled with the sound-absorbing material 1 provided in Example 1.
  • the sound-absorbing material 1 provided in this comparative example includes zeolite powder 11 and an organic binder, wherein the zeolite powder 11 is ZSM-5, the silicon-aluminum mass ratio of the zeolite powder 11 is 500, and the average particle size is 1.5 ⁇ m.
  • the preparation process of the sound-absorbing material 1 is: 100 g of zeolite powder 11 is added to 150 g of deionized water, and 7 g of polyacrylate organic adhesive is added to bond the zeolite powder 11 to form a granular sound-absorbing material 1.
  • 0.2cc of the granular sound-absorbing material 1 prepared in Example 1 is filled into the rear sound cavity 101 of the first sound-emitting device; the sound-absorbing material 1 packaging structure with a volume of 0.2cc prepared in Example 2 is assembled into the rear sound cavity 101 of the second sound-emitting device, and the shape of the sound-absorbing material 1 packaging structure matches the shape of the rear sound cavity 101 of the second sound-emitting device; 0.2cc of the sound-absorbing material 1 prepared in the comparative example is filled into the rear sound cavity 101 of the third sound-emitting device. Referring to FIG.
  • the sound-emitting devices used in the above-mentioned embodiments and comparative examples are of the same model, that is, they are assembled from a housing 10 and a sound-emitting unit 20, and the outer housing 10 is a housing 10 and a sound-emitting unit 20.
  • the housing 10 has a front acoustic cavity 102 and a rear acoustic cavity 101 therein.
  • a fourth sound-emitting device is set as a control group, and the rear sound cavity 101 of the fourth sound-emitting device is not filled with any sound-absorbing material 1.
  • the impedance (IMP) test is performed on the first sound emitting device, the second sound emitting device, the third sound emitting device and the fourth sound emitting device respectively.
  • the resonant frequency F0 of each sound-generating device is detected to obtain the IMP curve diagrams shown in FIGS. 3 and 4 .
  • the horizontal axis represents the frequency of sound vibration (Hz), and the vertical axis represents the impedance value of the sound.
  • the frequency when the impedance value reaches the first peak is the resonant frequency F0 of the sound-generating device, and this resonant frequency is recorded as the initial acoustic performance of the sound-generating device.
  • the F0 of the fourth sound-emitting device provided by the control group is 1000 Hz
  • the F0 of the first sound-emitting device provided by Example 1 is 845 Hz
  • the F0 of the second sound-emitting device provided by Example 2 is 845 Hz
  • the F0 of the third sound-emitting device provided by the comparative example is 900 Hz.
  • the sound-absorbing material 1 provided by the present invention Comparing the resonant frequencies F0 of the first sound-emitting device, the second sound-emitting device, the third sound-emitting device and the fourth sound-emitting device, it is shown that when the sound-absorbing material 1 provided by the present invention is filled in the sound-emitting device, the resonant frequency of the sound-emitting device is significantly reduced and the acoustic performance of the sound-emitting device is improved. Therefore, the sound-absorbing material 1 provided by the present invention has better sound absorption effect under different filling forms.
  • Each sound-generating device was placed in an environment with a temperature of 65°C and a relative humidity of 95% RH, and a 3.5V voltage and a pink noise signal were applied, and the device was powered on continuously for 120 hours.
  • each sound-generating device After the test, the resonant frequency F0 of each sound-generating device is detected and recorded as the acoustic performance after the test; and each sound-generating device is disassembled to observe the damage of the sound-absorbing material 1 in the rear sound cavity 101.
  • the change in the resonant frequency F0 of the first sound-emitting device provided in Example 1 before and after the reliability test is 13 Hz
  • the change in the resonant frequency F0 of the second sound-emitting device provided in Example 2 before and after the reliability test is 5 Hz, which is relatively small
  • the change in F0 of the third sound-emitting device provided in the comparative example is 33 Hz, which is relatively large.
  • the third acoustic device provided in the comparative example had a lot of broken powder scattered in the rear sound cavity 101 of the speaker, or entered the magnetic circuit of the sound-generating unit 20, indicating that the sound-absorbing material 1 was broken.
  • the sound-absorbing materials 1 provided in Examples 1 and 2 did not break after the test, indicating that the sound-absorbing material 1 provided by the present invention has a higher structural strength, can withstand higher intensity vibration, is not easy to break and powder in a high temperature and high humidity environment, and further improves the acoustic effect of the sound-generating device.
  • the following reliability experiments are carried out on the first sound-emitting device, the second sound-emitting device and the third sound-emitting device respectively.
  • Each sound-generating device was placed in an environment with a temperature of -20°C, and supplied with a voltage of 3.5V. Under the conditions of a scanning frequency of 400Hz to 1000Hz and 10s log double, it was powered on continuously for 120h.
  • each sound-generating device After the test, the resonant frequency F0 of each sound-generating device is detected and recorded as the acoustic performance after the test; and each sound-generating device is disassembled to observe the damage of the sound-absorbing material 1 in the rear sound cavity 101.
  • the change in the resonant frequency F0 of the first sound-emitting device provided in Example 1 before and after the reliability test is 10Hz
  • the change in the resonant frequency F0 of the second sound-emitting device provided in Example 2 before and after the reliability test is 4Hz, which is relatively small
  • the change in F0 of the third sound-emitting device provided in the comparative example is 71Hz, which is large and has exceeded the standard frame line (60Hz).
  • the third acoustic device provided in the comparative example had a lot of broken powder scattered in the rear sound cavity 101 of the speaker, or entered the magnetic circuit of the sound-generating unit 20, indicating that the sound-absorbing material 1 was broken.
  • the sound-absorbing materials 1 provided in Examples 1 and 2 did not break after the test, indicating that the sound-absorbing material 1 provided by the present invention has a higher structural strength, can withstand higher intensity vibration, is not easy to break and powder in a low temperature environment, and further improves the acoustic effect of the sound-generating device.
  • the sound-absorbing material 1 provided by the present invention has higher structural strength and internal material utilization rate, and thus has better sound absorption performance. On the other hand, it can withstand vibrations of higher power intensity in high temperature, low temperature and high humidity environments, is not prone to breakage and powdering during use, and has better acoustic effects.

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  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

Sont divulgués dans la présente invention un matériau d'absorption de son, un appareil de production de son et un dispositif électronique. Le matériau d'absorption de son comprend des particules de poudre de zéolite et un adhésif inorganique, le rapport en masse de silicium-aluminium des particules de poudre de zéolite étant ＜200, la taille de particule moyenne des particules de poudre de zéolite étant ＜0,1 µm, et la surface spécifique des particules de poudre de zéolite étant ≥ 300m2/g. Les particules de poudre de zéolite présentent chacune une structure cristalline MFI ; l'adhésif inorganique est utilisé pour lier une pluralité des particules de poudre de zéolite dans le matériau d'absorption de son ; le matériau d'absorption de son présente une structure macroporeuse, la proportion du volume de pore de la structure macroporeuse dans le volume de pore du matériau d'absorption de son étant de 20 % à 90 %, et le volume de pore du matériau d'absorption de son étant ≥0,02 ml/g. Le matériau d'absorption de son fourni par la présente invention présente une résistance supérieure, est moins sujet à la rupture et, lorsqu'il est appliqué à des appareils de production de son, peut résister à des vibrations d'intensité de puissance supérieure et présenter une tolérance environnementale améliorée, ce qui permet d'assurer les effets acoustiques des appareils de production de son.
PCT/CN2023/078110 2022-11-15 2023-02-24 Matériau d'absorption de son, appareil de production de son et dispositif électronique WO2024103562A1 (fr)

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CN118102193A (zh) * 2024-04-25 2024-05-28 歌尔股份有限公司 吸音颗粒及其制备方法、发声装置和电子设备

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