WO2018040394A1

WO2018040394A1 - Loudspeaker module

Info

Publication number: WO2018040394A1
Application number: PCT/CN2016/111112
Authority: WO
Inventors: 曹晓东; 刘金利
Original assignee: 歌尔股份有限公司
Priority date: 2016-08-31
Filing date: 2016-12-20
Publication date: 2018-03-08
Also published as: CN107659875A; CN107547994A; CN106162468A; CN107454524A; CN107708040A

Abstract

A loudspeaker module, comprising a module shell having an accommodation cavity; a loudspeaker assembly arranged inside the accommodation cavity and dividing the accommodation cavity into a rear acoustic cavity and a front sound generating region; and aluminosilicate-free zeolite particles (1) filled in the rear acoustic cavity, the aluminosilicate-free zeolite particles (1) being formed by bonding raw zeolite powder particulates (11) with a binder, wherein the raw zeolite powder particulates (11) have primary pore channels with a pore diameter ranging from 0.3 nm to 20 nm, and in the aluminosilicate-free zeolite particles (1) there are secondary pore channels (3) between the raw zeolite powder particulates (11). Provided is a loudspeaker module having a lower resonant frequency.

Description

Speaker module

Technical field

The invention belongs to the technical field of loudspeakers, and in particular to a loudspeaker module.

Background technique

As an energy converter for converting electrical signals into sound signals, the speaker module is an indispensable component in electro-acoustic products. The speaker module is usually composed of a casing and a speaker unit, and the speaker unit divides the inner cavity of the module casing into two chambers of a front sound chamber and a rear sound chamber. In order to improve the acoustic performance of the speaker module (such as reducing the resonant frequency F0 of the module and expanding the bandwidth), a sound absorbing member is usually added in the rear sound chamber, and the sound absorbing member absorbs part of the sound energy, which is equivalent to expanding the volume of the rear cavity, thereby Achieve the effect of reducing the module F0. Conventional sound absorbing members are foamed foams such as polyurethane, melamine and the like.

In recent years, under the trend of increasingly thinner and lighter electronic products, speaker units, which are important components of electronic products, have continued to develop in a flattened structure. However, the flat structure of the micro-speaker module will cause the cavity volume of the rear acoustic cavity to shrink, resulting in an increase in the resonant frequency F0 of the speaker, and a decrease in the low-frequency sensitivity, which adversely affects the acoustic performance of the speaker.

In order to solve the contradiction between the thinness and the acoustic performance of the speaker module, the inventors of the present invention have found that a porous material (such as activated carbon, natural zeolite powder, active silica, molecular sieve or according to a specific type and ratio) can be used. The mixture is filled into the rear acoustic cavity, and the special physical pore structure inside the porous material is used to realize rapid adsorption-desorption of the gas in the rear acoustic cavity, thereby achieving the effect of virtually increasing the resonance space of the acoustic cavity after the speaker. This method can reduce the resonant frequency F0 of the speaker and improve the sensitivity of the low frequency sound.

Summary of the invention

It is an object of the present invention to provide an improved resonant frequency of a speaker module New technology solutions.

According to a first aspect of the present invention, a speaker module is provided, comprising:

a module housing, the module housing having a receiving cavity;

a speaker assembly disposed in the accommodating cavity, the speaker assembly dividing the accommodating cavity into a rear acoustic cavity and a front sounding zone;

Filling the aluminosilicate-free zeolite particles in the rear acoustic cavity, the aluminosilicate-free zeolite particles being composed of the zeolite raw powder particles bonded by an adhesive;

Wherein the zeolite raw powder particles have a first-order pore having a pore diameter ranging from 0.3 to 20 nm, and in the aluminosilicate-free zeolite particles, the zeolite raw powder particles have a second-order pore between them .

Optionally, the primary channel comprises micropores and/or mesopores, the micropores having a pore size of less than 2 nm, and the mesopores having a pore size ranging from 2 to 20 nm. More preferably, the pores have a pore size ranging from 0.4 to 0.8 nm, and the mesopores have a pore size ranging from 2 to 10 nm.

Optionally, the zeolite raw powder particles are prepared by hydrothermal crystallization of a silicon source material, a templating agent, and an auxiliary material.

Optionally, the zeolite raw powder particles are of an MFI zeolite structure.

Optionally, the aluminosilicate-free zeolite particles have a specific surface area ranging from 250 to 550 m ² /g.

Optionally, the aluminosilicate-free zeolite particles have a surface layer binder content higher than the internal binder content.

Optionally, the aluminosilicate-free zeolite particles are spherical or ellipsoidal, and the aluminosilicate-free zeolite particles have an aspect ratio of less than 1.5 and a particle size ranging from 0.05 to 0.50 mm.

Optionally, the aluminosilicate-free zeolite particles have an elastic deformation displacement greater than 20 microns.

Optionally, the virgin powder particles have a particle size ranging from 0.2 to 5 microns.

Optionally, the mass ratio of the binder in the aluminosilicate-free zeolite particles ranges from 5 to 15%.

Optionally, the aluminosilicate-free zeolite particles contain a doping element, and the doping element includes at least one of boron, iron, titanium, potassium, calcium, tin, antimony, and cerium.

The inventors of the present invention have found that in the prior art, a novel non-foamed porous sound absorbing material It has a better sound absorbing effect than the conventional sound absorbing material, and the performance of the new non-foaming sound absorbing material is generally recognized by those skilled in the art. Therefore, in the case where it is required to further reduce the resonance frequency of the speaker, those skilled in the art will select a technical means for improving the structure of the speaker. Further research and improvement on the acoustic properties of non-foamed sound absorbing materials will not be considered. Therefore, the technical task to be achieved by the present invention or the technical problem to be solved is not thought of or expected by those skilled in the art, so the present invention is a new technical solution.

Other features and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

DRAWINGS

The accompanying drawings, which are incorporated in FIG

Figure 1 is a schematic view of the aluminosilicate-free zeolite particles provided by the present invention;

2 is a microscopic schematic view of the aluminosilicate-free zeolite particles provided by the present invention;

Figure 3 is a graph showing the anti-aging performance of zeolite particles of different structures;

Figure 4 is a graph showing the internal composition of the aluminosilicate-free zeolite particles provided by the present invention.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in the embodiments are not intended to limit the scope of the invention unless otherwise specified.

The following description of the at least one exemplary embodiment is merely illustrative and is in no way

Techniques, methods and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but the techniques, methods and apparatus should be considered as part of the specification, where appropriate.

In all of the examples shown and discussed herein, any specific values are to be construed as illustrative only and not as a limitation. Therefore, other examples of the exemplary embodiments may have different Value.

It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in one figure, it is not required to be further discussed in the subsequent figures.

The invention provides a speaker module, which comprises a module housing, a speaker assembly and aluminosilicate-free zeolite particles. The module housing has a receiving cavity therein, and the speaker assembly is disposed in the receiving cavity. The speaker assembly typically includes a vibrating assembly, a magnetic circuit assembly, etc., and the speaker assembly divides the receiving chamber into a front sounding zone and a rear sounding cavity. The vibration component generates vibration according to the received sound signal to emit a sound, and the sound propagates from the front sounding area to the outside of the speaker module. The sound that propagates from the vibrating assembly to the rear chamber is absorbed by the rear chamber. The aluminosilicate-free zeolite particles 1 shown in Fig. 1 are filled in the rear acoustic chamber for adsorbing the air in the acoustic chamber, and the aluminosilicate-free zeolite particles 1 are bonded by the zeolite raw powder particles through an adhesive. form.

The aluminosilicate-free zeolite particles 1 of the present invention means that the zeolite particles and the zeolite raw powder particles do not contain aluminum. It is detected as an aluminum-free element by atomic absorption spectroscopy or atomic fluorescence spectroscopy. Doping elements such as rare earth elements, boron, iron, titanium, potassium, calcium, tin, etc. may be present in the aluminosilicate-free zeolite particles 1 or the zeolite raw powder particles for surface modification and modification of the zeolitic material.铯, 锗, etc.

The aluminosilicate-free zeolite particles 1 have a significant improvement in adsorption-desorption of air molecules and anti-aging ability in comparison with aluminosilicate zeolite particles having a silicon to aluminum ratio of 420. . Using a post-acoustic cavity simulation test tool as a reference, a quantity of 0.15 g of the aluminosilicate-free zeolite particles 1 or aluminosilicate 420 particles of aluminosilicate ratio of 420 was filled in, as shown in the following table:

硅酸盐沸石颗粒样品Silicate zeolite particle sample	无铝Aluminum free	硅铝比420Silicon to aluminum ratio 420
谐振频率变化量△F0(Hz)Resonance frequency variation △F0 (Hz)	66.366.3	38.438.4

The aluminosilicate-free zeolite particles 1 reduced the resonant frequency F0 of the post-acoustic cavity test tool by 66.3 Hz, while the aluminosilicate zeolite particles of the silicon-aluminum ratio of 420 reduced the resonant frequency F0 by 38.4. It can be seen that the aluminosilicate-free zeolite particles have stronger adsorption-desorption ability to air.

The aluminosilicate zeolite particles 1 and the aluminosilicate zeolite particles having a ratio of silicon to aluminum of 420 are subjected to an aging test, and the two zeolite particles are respectively placed in a natural environment for a predetermined time, and then the zeolite particles are quantitatively filled into the back cavity. In the simulation test tooling, the resonance frequency variation ΔF0 is tested as shown in the following table:

硅酸盐沸石颗粒样品Silicate zeolite particle sample	00	24h 24h		48h48h	96h96h	120h120h	144h144h	168h168h
无铝Aluminum free	66.566.5	67.167.1	63.163.1	61.961.9	60.160.1	59.859.8	59.359.3
硅铝比：420Silicon to aluminum ratio: 420	37.937.9	32.132.1	30.430.4	26.426.4	21.421.4	18.618.6	16.316.3

The aluminosilicate-free zeolite particles can still reduce the resonance frequency ΔF0 of the post-acoustic cavity simulation test tool by 59.3 Hz after being left for 168 hours, while the aluminosilicate zeolite particles of the silicon-aluminum ratio of 420 are placed for 168 hours. Only the resonance frequency ΔF0 of the rear cavity simulation test tool can be lowered by 16.3 Hz. It can be seen that the anti-aging properties of the aluminosilicate-free zeolite particles are better.

In this test, the aluminosilicate zeolite particles and the aluminosilicate-free zeolite particles have similar physical properties. From the above comparison, it can be confirmed that since the aluminosilicate-free zeolite particles have different microstructures, the microporous structure and the pore connectivity are better, so that the aluminosilicate-free zeolite particles are adsorbed-desorbed with air molecules. Both ability and anti-aging ability have considerable advantages.

In particular, the fine particles of the zeolitic powder have a first-order pore, and the primary pore has a pore size ranging from 0.3 to 20 nm. The first-stage tunnel is used for adsorbing and compressing air. When the diaphragm of the speaker assembly vibrates, the air pressure in the rear sound chamber is increased, and the air in the rear sound chamber can enter the first-level tunnel and be compressed and adsorbed in the first-stage tunnel. In this way, without changing the actual volume of the rear cavity, it is equivalent to increasing the virtual space of the rear cavity, thereby increasing the adsorption amount of the air, thereby reducing the resonance frequency F0 of the speaker. The aluminosilicate-free zeolite particles 1 of the present invention are formed by the bonding of the zeolite raw powder particles 11, as shown in Fig. 2, the second layer of pores are formed between the zeolite raw powder particles 11, that is, the aluminosilicate-free zeolite particles. 3. The function of the secondary tunnel 3 is to enable the air of the rear sound chamber to smoothly and quickly enter and exit the first-level tunnel, and the secondary tunnel 3 provides a passage for the rapid flow of air. In this way, when the speaker assembly is rapidly vibrated to cause high-frequency changes in the air pressure of the rear sound chamber, the aluminosilicate-free zeolite particles can quickly adsorb and release air, thereby improving the sound response sensitivity of the speaker module.

The speaker module provided by the invention has a lower resonance frequency and has good response sensitivity to low frequency sound signals. Further, the speaker module of the present invention has a longer service life, and the acoustic performance of the module is attenuated at a slower speed. Under normal use, the speed of the attenuation is an acceptable range.

The diameter distribution of the first-order pores in the original zeolite powder is concentrated, which is mainly determined by the raw powder synthesis parameters such as temperature, time, and type of template. The pore diameter of the secondary channel 3 is mainly affected by the particle size of the zeolite raw powder particles 11, the selection of the binder system, the molding process, and the like. Preferably, as shown in FIG. 2, the primary channel comprises micropores 21 and/or mesopores 22 having a pore size of less than 2 nm and a pore size of the mesopores 22 ranging from 2 to 20 nm. The pore size of the micropores 21 is close to the size of the air molecules. When the pressure of the rear acoustic chamber is increased, the micropores 21 can effectively accommodate air molecules and provide space for compression and adsorption of the air. The mesopores 22 provide a smooth flow path for the air in and out of the microholes 21, which in turn can also contain air molecules, providing a space for compressing and adsorbing air.

More preferably, the pore size of the micropores 21 is concentrated at 0.4 nm to 0.8 nm, and the pore diameter of the mesopores 22 is concentrated at 2 nm to 10 nm. In this case, the aluminosilicate-free zeolite particles are capable of minimizing the resonant frequency of the speaker module. If the pore diameter of the micropores 21 is generally less than 0.4 nm, it is difficult for the nitrogen molecules in the air molecules to enter the micropores 21, or the micropores 21 may be blocked, and the adsorption and compression of the air may not be formed; and when the pore diameter of the micropores 21 is generally larger than At 0.8 nm, an excessively large pore size cannot obtain a large specific surface area, resulting in a decrease in nitrogen adsorption amount, and both of the above conditions degrade the performance of the aluminosilicate-free zeolite particles to lower the resonance frequency. For the pore size of the mesopores 22, if the pore size of the mesopores 22 is less than 2 nm, the mesopores 22 cause a strong damage to the structure of the micropores 21, resulting in unstable structure of the zeolite raw powder particles 11 and difficulty in forming no The aluminosilicate zeolite particles; when the pore diameter of the mesopores 22 is generally greater than 10 nm, the excessive mesopores 22 cannot effectively communicate with all the micropores 21, and the adsorption and desorption of gas molecules in the micropores 21 are affected. Certain resistance, resulting in a decrease in the performance of the aluminosilicate-free zeolite particles to reduce the resonant frequency. Therefore, a preferred embodiment of the invention is that the pore size of the pores is concentrated between 0.4 nm and 0.8 nm, and the pore size of the mesopores 22 is concentrated between 2 nm and 10 nm.

The original zeolite powder of the present invention is directly hydrothermally crystallized by a silicon source material and a templating agent. Zeolite raw powder particles having a microscopic zeolite structure should be constructed. The aluminum element is not introduced into the artificially synthesized zeolite raw powder with respect to the conventional aluminosilicate zeolite. In order to form a good porous microstructure, other auxiliary materials such as rare earth elements, boron, iron, titanium, potassium, calcium, tin, antimony, bismuth and other doping elements may be added during the hydrothermal crystallization reaction. A porous structure is formed. The amount and type of the templating agent can also be selected according to the conditions for synthesizing the original zeolite powder.

In addition, the microscopic framework structure of the zeolite raw powder particles also has an effect on the aging resistance and air adsorption-desorption performance of the aluminosilicate-free zeolite particles. Preferably, the zeolite raw powder particles provided by the present invention have an MFI structure, and the aluminosilicate-free zeolite particles formed by the zeolite raw powder particles having the MFI structure can significantly reduce the resonance frequency of the speaker module. On the other hand, the aging-free silicate zeolite particles having the MFI structure have better anti-aging properties. The MFI structure of the original zeolite particles has a specific three-dimensional skeleton structure at the microscopic level, and the formed pore structure is favorable for the rapid adsorption and desorption of air molecules, so that the resonance frequency effect and the anti-aging ability are well exhibited. The pore structure formed by other non-MFI structure of the original zeolite powder is not conducive to rapid desorption of adsorbed air molecules, resulting in blockage of the pores, resulting in aging failure in the natural environment.

As shown in FIG. 3, the zeolite particles having the DDR, BEA, and MFI structures are taken as an example for comparison. It can be seen that the MFI structure zeolite particles cause the change amount of the resonance frequency of the post-acoustic cavity simulation test tool to be ΔF0 in the unaged state. The highest, and after 288 hours of natural environment, the amount of change ΔF0 produced by the MFI structure zeolite particles is only reduced by 10%, while the amount of change ΔF0 produced by the non-MFI zeolite particles under the same conditions is reduced by 30% to 40%, respectively. . It can be seen that the zeolite raw powder particles having the MFI structure have better effects in improving the resonance frequency of the speaker module, and are better in anti-natural aging performance.

The specific surface area of the aluminosilicate-free zeolite particles also has an effect on the properties of its adsorption-desorption air. Alternatively, in one embodiment of the invention, the zeolite particles have a specific surface area in the range of 250 -550m ² /g. Five kinds of aluminosilicate-free zeolite particles with different specific surface areas and similar physical properties were compared, and the variation ΔF0 generated by the above-mentioned resonance frequency of the post-acoustic cavity simulation test tool was used as a standard, as shown in the following table:

BET multi-point method specific surface area / m ² /g

215

330

390

457

689

△F0/Hz

35

83

121

104

57

It can be seen from the comparison results that the aluminosilicate-free zeolite particles having a specific surface area of 330-450 m ² /g have the largest change amount ΔF0 of the resonance frequency of the speaker module, and the resonance response frequency decreases more. If the specific surface area of the zeolite particles is large, it means to a large extent that the zeolite particles can adsorb a large amount of air molecules. However, after the specific surface is increased to a specific peak, the pore structure inside the zeolite particles is more complicated and curved, and the gas flow stroke becomes longer. When the sound intensity of the speaker module is changed, during the millisecond sound pressure change, the air molecules cannot pass through the long and long curved channels, that is, the zeolite particles cannot achieve rapid adsorption-desorption of air molecules. . Therefore, the zeolite particles which cause excessive specific surface area cannot effectively reduce the resonance frequency of the speaker module. More preferably, in a preferred embodiment of the invention, the aluminosilicate-free zeolite particles have a specific surface area in the range of from 330 to 450 m ² /g.

The aluminosilicate-free zeolite particles of the present invention are formed from zeolite raw powder particles by an adhesive. Zeolite particles have a certain elasticity. When the speaker module is in operation, the resonance response frequency can reach 800-1KHz, which causes high-frequency vibration of the non-foaming sound absorbing material particles and friction between particles, which causes the particles to produce fine powder or even break, which affects the optimization of the acoustic performance of the zeolite module by the zeolite particles. Debugging effect. To a certain extent, the overall strength of the aluminosilicate-free zeolite particles is proportional to the amount of binder. The higher the amount of binder, the higher the particle strength, the long-term high-frequency operation and mechanical drop resistance test in the speaker module. The better the performance. However, the binder may cause clogging of the primary pores of the original zeolite powder, or may have a significant influence on the pore size, pore structure and the like of the micropores, thereby attenuating its adsorption-desorption performance to air. Moreover, the selection and addition amount of the binder system has a significant influence on the anti-aging and anti-pollution properties of the aluminosilicate-free zeolite particles.

Compared to rigid zeolite particles, elastomeric zeolite particles have significant advantages in terms of wear resistance and resistance to transient mechanical impact. For example, a rigid zeolite particle having a particle diameter of 0.25-0.35 mm and an elastic deformation displacement of less than 20 μm is used for a certain period of time in a speaker module of rated power, and fine particles of zeolite particles appear in the cavity and the zeolite particles are broken. Under the same conditions, the elastic zeolite particles having a particle diameter of 0.25-0.35 mm and an elastic deformation displacement of more than 20 μm do not cause powdering or breaking. Therefore, preferably, the aluminosilicate free of the present invention The elastic deformation displacement of the zeolite particles can be greater than 20 microns.

Further, the mass ratio of the binder ranges from 5 to 15% with respect to the overall mass of the aluminosilicate-free zeolite particles. The amount of the binder is within this range, and the zeolite particles can be provided with appropriate rigidity and elasticity without affecting the adsorption performance of the zeolite particles to the air, thereby avoiding the phenomenon that the zeolite particles are powdered and broken during operation. More preferably, the mass ratio of the binder may range from 6 to 10%.

In particular, the particle size of the aluminosilicate-free zeolite particles can be adjusted according to the actual application of the speaker module, and the zeolite particles can also be matched by a reasonable combination of the selection of the binder system and the molding process. The internal zeolite raw powder particles form a suitable spacing between them, which in turn allows the zeolite particles to obtain a good ability to rapidly adsorb-desorb air. Preferably, in order to balance the adsorption-desorption ability and structural stability of the zeolite particles, the binder content of the surface layer of the aluminosilicate-free zeolite particles provided by the embodiment of the present invention may be higher than the content of the interior of the particles.

Referring to Figure 4, the carbon C, O O, and Si Si elements on the surface and inside of the two zeolite particles were compared. The surface C content is higher than the inner surface, and the surface Si is lower than the inner surface, indicating that the surface adhesive content is higher than the inner portion, and the ratio of the adhesive content of the surface layer of the zeolite particles to the inner layer of the granular particles is higher than 1:1. On the one hand, this embodiment can ensure that the surface of the aluminosilicate-free zeolite particles has sufficient particle strength, and does not cause powder or even breakage in the normal operation and drop test of the speaker module. On the other hand, the amount of the binder can be controlled to prevent the virtual expansion capacity of the aluminosilicate-free zeolite particles and the attenuation of the resistance to the organic volatile atmosphere due to the excessive amount of the binder. Zeolite particles are guaranteed to have good adsorption-desorption properties and aging resistance.

The particle size of the aluminosilicate-free zeolite particles of the present invention has an effect on the performance of its adsorption-desorption air. Preferably, when the particle size ranges from 0.15 to 0.50 mm, the performance of reducing the resonant frequency in the speaker module is most pronounced. The inventors of the present invention found that the reason is that if the particle size of the zeolite particles is small, for example, between 0.05 and 0.10 mm, the zeolite particles are mostly contacted or stacked at a single point or multiple points, and the bulk density is large, and the acoustic resistance is relatively high. The structure of the sound absorbing member composed of large, zeolite particles is dense. When the sound intensity of the speaker module changes, the air cannot be adsorbed or desorbed in the micropores in the center of the zeolite particles during the millisecond pressure change. That is, the adsorption capacity of the zeolite particles to the air molecules cannot be effectively exerted in the process of changing the sound pressure of the speaker module in milliseconds. Phase Conversely, if the particle size is too large, such as 0.60-1 mm, the effective mol amount of the granule material per unit volume is less, and the adsorption-desorption ability to air is lowered. Therefore, in a preferred embodiment of the invention, the aluminosilicate-free zeolite particles have an average particle size ranging from 0.05 to 0.50 mm.

In addition, in order to ensure the properties of the aluminosilicate-free zeolite particles, the present invention further has certain requirements on the sphericity of the particles. Preferably, the aluminosilicate-free zeolite particles are spherical, and the spherical aluminosilicate-free zeolite particles having uniform particle diameter can be uniformly filled in the speaker, and the sound absorbing performance is good. Alternatively, the aluminosilicate-free zeolite particles may also have an ellipsoidal shape with an aspect ratio of less than 1.5. In this way, the particles can also achieve a uniform, dense filling in the speaker. However, if the aspect ratio is too large, or the overall shape of the particles is irregular, the pore structure inside the particles will be affected. Therefore, in order to obtain a better technical effect, it is necessary to ensure that the particles have a certain degree of sphericity.

On the other hand, the inventors of the present invention have found that the particle diameter of the zeolite raw powder fine particles for forming the aluminosilicate-free zeolite particles also affects the adsorption-desorption property of the zeolite particles. If the particle size of the zeolite raw powder particles is larger than 5 μm, the length of the first-order pores formed therein is relatively long, and under the condition of high-frequency operation of the speaker, the air molecules cannot quickly and responsively enter and exit the longer first-order pores, resulting in zeolite. The adsorption-desorption properties of the particles are degraded. On the contrary, if the particle size of the zeolite raw powder particles is too small, the length of the primary pores is too short to provide sufficient space for adsorption and compression of air molecules, and the adsorption-desorption performance of the zeolite particles is also lowered. Therefore, in a preferred embodiment of the invention, the zeolite raw powder particles have a particle size ranging from 0.2 to 5 microns, and more preferably, a particle size ranging from 0.3 to 1.5 microns.

While the invention has been described in detail with reference to the preferred embodiments of the present invention, it is understood that It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

A speaker module, comprising:

a module housing, the module housing having a receiving cavity;

a speaker assembly disposed in the accommodating cavity, the speaker assembly dividing the accommodating cavity into a rear acoustic cavity and a front sounding zone;

Filling the aluminosilicate-free zeolite particles (1) in the rear acoustic cavity, the aluminosilicate-free zeolite particles (1) being composed of the zeolite raw powder particles (11) bonded by an adhesive;

Wherein the zeolite raw powder particles (11) have a first-order pores having a pore diameter ranging from 0.3 to 20 nm, and in the aluminosilicate-free zeolite particles (1), the zeolite raw powder particles There is a secondary tunnel (2) between (11).
The speaker module according to claim 1, wherein the first-stage tunnel comprises micropores (21) and/or mesopores (22), and the pores (21) have a pore diameter of less than 2 nm. The pores (22) have a pore size ranging from 2 to 20 nm.
The speaker module according to claim 1 or 2, wherein the micropores (21) have a pore diameter ranging from 0.4 to 0.8 nm, and the mesopores (22) have a pore diameter ranging from 2 to 10 nm.
The speaker module according to any one of claims 1 to 3, characterized in that the zeolite raw powder particles (11) are produced by hydrothermal crystallization of a silicon source material, a templating agent and an auxiliary material.
A speaker module according to any one of claims 1 to 4, characterized in that the zeolite raw powder particles (11) are of a MFI zeolite structure.
A speaker module according to any one of claims 1 to 5, characterized in that the aluminosilicate-free zeolite particles (1) have a specific surface area in the range of from 250 to 550 m 2 /g.
A speaker module according to any one of claims 1 to 6, wherein the aluminosilicate-free zeolite particles (1) have a surface layer binder content higher than the internal binder content.
The speaker module according to any one of claims 1 to 7, wherein the aluminosilicate-free zeolite particles (1) are spherical or ellipsoidal, and the aluminosilicate-free zeolite particles have an aspect ratio smaller than 1.5, the particle size range is 0.05-0.50mm.
A speaker module according to any one of claims 1-8, characterized in that The mass ratio of the binder in the aluminosilicate-free zeolite particles ranges from 5 to 15%.
The speaker module according to any one of claims 1 to 9, characterized in that the aluminosilicate-free zeolite particles (1) contain doping elements, and the doping elements include boron, iron, titanium, At least one of potassium, calcium, tin, strontium, and barium.