Improved loudspeaker and electronic device using ith molecular sieve

Abstract

The application discloses an improved loudspeaker and electronic equipment of ITH molecular sieve. The loudspeaker is filled with ITH molecular sieve in the back cavity; the ITH molecular sieve is composed of a skeleton and cations outside the skeleton, the skeleton comprises silicon dioxide and an oxide of a non-silicon element M, a Si / M molar ratio is at least above 80, preferably above 100; the ITH molecular sieve contains uniform micropores, the micropore size is 0.4nm to 0.55nm, and the micropore volume is 0.10 to 0.25cm 3 / g. The loudspeaker contains ITH molecular sieve in the back cavity, the acoustic compliance of the air in the back cavity is increased, and thus the performance of the loudspeaker in a low frequency band is improved.

Description

Technical Field

[0001] The present invention relates to the field of loudspeaker devices, and in particular to a loudspeaker and electronic equipment improved with ITH molecular sieve. Background Art

[0002] With the advancement of technology, people's expectations for speakers are becoming increasingly high, especially for mobile phone speakers. The demand is not just for a small size and a loud sound, but also for excellent sound quality. Sound quality is closely related to every aspect of the speaker design and manufacturing process, especially the size of the speaker's back cavity. Typically, reducing the speaker's back cavity significantly reduces low-frequency response, resulting in poor sound quality. Therefore, it is difficult to achieve excellent sound quality with a very small back cavity.

[0003] To resolve this contradiction, engineers have proposed various approaches, including: 1) replacing air with a more acoustically compliant gas as the back cavity atmosphere; 2) filling the back cavity with foams like melamine to increase acoustic compliance; and 3) filling the back cavity with porous materials such as activated carbon, zeolite, and silica to increase the volume of the virtual back cavity and improve acoustic compliance. The third approach has the most significant effect.

[0004] CN101416528A proposes using shaped activated carbon as a speaker improvement material. CN103477655A uses porous carbon materials as a low-frequency speaker improvement material, using Cu-ZSM-5 to adsorb water vapor to prevent excessive water vapor pressure in the back chamber, which could clog the porous carbon. The speaker improvement material proposed in CN105013436A primarily contains zeolite structures such as FER, MFI, and BEA.

[0005] ITH molecular sieve, generally known as ITQ-13, is a new type of microporous material with a three-dimensional orthogonal interconnected pore structure of both 9-membered rings and 10-membered rings. Its 9-membered ring pores are parallel to the a-axis and are straight channels with an opening size of 0.40nm×0.49nm; the other two sets of 10-membered ring channels are straight channels parallel to the b-axis (0.47nm×0.51nm) and sinusoidal zigzag channels roughly parallel to the c-axis (0.48nm×0.57nm). Summary of the Invention

[0006] The present invention provides a loudspeaker and electronic equipment improved with ITH molecular sieve. The rear cavity of the loudspeaker is filled with ITH molecular sieve material. The addition of the material can significantly improve the low-frequency performance of the loudspeaker.

[0007] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0008] In one aspect, the present invention provides an ITH molecular sieve improved speaker, wherein the rear cavity of the speaker is filled with the ITH molecular sieve;

[0009] The ITH molecular sieve is composed of a framework and extra-framework cations, wherein the framework includes silicon dioxide and an oxide of a non-silicon element M, and the Si / M molar ratio is at least 80, preferably 100 or more;

[0010] The ITH molecular sieve contains uniform micropores with a micropore size of 0.4 nm to 0.55 nm and a micropore volume of 0.10 to 0.25 cm 3 / g.

[0011] If the pore size of the ITH molecular sieve is too small, less than 0.4nm, since the size of nitrogen molecules is 0.364nm, the pore size is very close to the nitrogen size, and the rapid adsorption, desorption and diffusion of nitrogen in the pores are limited. If the pore size is too large, the physical force corresponding to the nitrogen molecules is reduced, and the enrichment and analysis amount of nitrogen in the pores corresponding to the change of sound pressure is limited, and the effect is not ideal. If the micropore volume is too small, the corresponding ITH crystallinity is insufficient, there are not enough micropores, and the corresponding acoustic effect is very limited; preferably, the micropore volume is 0.15-0.25cm 3 / g.

[0012] According to the loudspeaker of the present invention, the non-silicon element M is preferably a trivalent, tetravalent, or pentavalent ion. Trivalent ions primarily include, but are not limited to, Al, Fe, and B, tetravalent ions primarily include, but are not limited to, Ge, Ti, and Zr, and pentavalent ions primarily include, but are not limited to, Ga. More preferably, the non-silicon element M is B or Al.

[0013] According to the loudspeaker of the present invention, preferably, the extra-framework cations are selected from at least one of H ions, alkali metal ions or alkaline earth metal ions, and more preferably, the extra-framework cations are selected from at least one of alkali metals or alkaline earth metals.

[0014] Typically, the framework of an ITH molecular sieve is primarily composed of silicon dioxide and germanium dioxide. Germanium-containing molecular sieves will hydrolyze when exposed to air, resulting in poor stability. Their scientific significance generally outweighs their practical value. In addition to silicon germanium, ITH typically incorporates boron to synthesize boron-containing ITQ-13. There are generally two methods for synthesizing aluminum-containing ITQ-13: 1) substitution with boron-containing ITQ-13; and 2) direct synthesis under optimized conditions. In the ITH molecular sieve of the present invention, M is preferably B or Al. If the Si / M ratio is less than 80, it will significantly adsorb moisture from the air, occupying most of the molecular sieve's micropores, resulting in no low-frequency improvement. Furthermore, when synthesizing with M elements other than germanium, if the Si / M ratio is too low, synthesis will be difficult or the resulting ITH structure will have poor or very poor crystallinity.

[0015] Before use, ITH molecular sieves are usually exchanged with cations according to the situation to obtain different types of ITH molecular sieves. Generally, ammonium salts, alkali metal salts or alkaline earth metal salts are commonly used to exchange with molecular sieves. Ammonium salts mainly include: ammonium chloride, ammonium nitrate, ammonium sulfate, ammonium carbonate, etc.; alkali metal salts mainly include: lithium salts, sodium salts, potassium salts, rubidium salts, etc., and the anions of alkali metal salts include: chloride ions, sulfate ions, nitrate ions, etc.; alkaline earth metal salts mainly include: magnesium salts, calcium salts, barium salts, etc., and the anions of alkali metal salts include: chloride ions, sulfate ions, nitrate ions, etc.

[0016] According to the speaker of the present invention, preferably, the content of the extra-framework cations is less than 4.5 wt.%, more preferably less than 1.5 wt.%, and further preferably 0.05 wt.% to 1.5 wt.%.

[0017] According to the loudspeaker of the present invention, preferably, the particle size of the ITH molecular sieve is greater than 10 nanometers, more preferably greater than 100 nanometers.

[0018] According to the loudspeaker of the present invention, preferably, the molecular sieve has a particle size smaller than 10 microns, more preferably smaller than 7 microns.

[0019] In the speaker of the present invention, preferably, a binder is added to the ITH molecular sieve in the rear cavity to form a specific shape to prevent the raw sieve powder from entering the speaker unit. The specific shape is preferably granular (spherical, ellipsoidal, ellipsoidal with a central pit, irregular granular, etc.), flake, or block. Flakes and blocks can be loaded first, and then the rear cavity is assembled. Granular shapes are generally loaded after the rear cavity is assembled.

[0020] According to the loudspeaker of the present invention, preferably, the size of the particles in the specific shape is 80 μm to 2000 μm, more preferably 100 μm to 1500 μm.

[0021] According to the loudspeaker of the present invention, preferably, the size of the sheet in the specific shape is determined according to the rear cavity of the loudspeaker, preferably with a thickness of 100 μm to 1000 μm, and a length and width of 3 mm to 100 mm.

[0022] According to the loudspeaker of the present invention, preferably, the size of the block in the specific shape is determined according to the rear cavity of the loudspeaker, preferably with a thickness of 1 mm to 20 mm, and a length and width of 3 mm to 100 mm.

[0023] Normally, directly synthesized ITH molecular sieves are in the form of powders less than 10μm, and most of them need to be molded into a specific shape together with a binder before being placed in the back cavity of the speaker for use. Direct use of the raw powder without forming it will cause the raw powder to enter the speaker unit, affecting the performance of the speaker. During the molecular sieve molding process, it is usually necessary to add the required shaped molecular sieve, solvent, binder and auxiliary agent. Among them, the binder can be an inorganic binder or an organic polymer binder; preferably, the inorganic binder includes activated alumina, silica sol, etc.; the organic polymer binder includes acrylates, epoxies, polyurethanes, etc. The solvent mainly refers to water and various commonly used organic solvents, such as ethanol, toluene, acetone, tetrahydrofuran, etc. The auxiliary agent refers to other substances added in very small amounts, usually less than 5%.

[0024] According to the loudspeaker of the present invention, the framework of the ITH molecular sieve may not include oxides of the non-silicon element M.

[0025] The loudspeaker provided by the present invention has an ITH molecular sieve filled in the rear cavity, which increases the acoustic compliance of the air in the rear cavity, thereby improving the performance of the loudspeaker in the low frequency band.

[0026] Another aspect of the present invention provides an electronic device including the above-mentioned speaker. The electronic device includes, but is not limited to, a smartphone, a TWS (True Wireless Stereo) headset, headphones, smart glasses, a smart watch, a VR device, an AR device, a tablet computer, or a thin and light laptop computer. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a comparison chart of nitrogen adsorption of the molecular sieve raw powder in Example 1 and Comparative Example 1 at room temperature.

[0028] Figure 2 This is a comparison diagram of the frequency response curve and impedance curve with and without ITH molecular sieve added to the rear cavity of the speaker in Example 1.

[0029] Figure 3 This is a low-temperature nitrogen adsorption characterization diagram of the aluminum-containing ITH molecular sieve raw powder in Example 3. DETAILED DESCRIPTION

[0030] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the following specific description is illustrative rather than restrictive and should not be used to limit the scope of protection of the present invention.

[0031] All numerical specifications herein (e.g., temperatures, times, concentrations, and weights, including ranges for each thereof) are generally approximate and may be modified (+) or (-) in increments of 0.1 or 1.0. All numerical specifications are to be understood as being preceded by the term "about."

[0032] Example 1

[0033] This example prepares an all-silicon ITH molecular sieve (ITQ-13) and applies it to a speaker to test its acoustic performance, including the following process:

[0034] 1) Preparation of all-silica ITH molecular sieve (ITQ-13):

[0035] An all-silicon ITH molecular sieve is synthesized using ethyl orthosilicate as a silicon source, hydrogen fluoride as a mineralizer, hexamethonium hydroxide as a template, and hydrated in a ratio of 1 SiO2:0.5 hexamethonium hydroxide:0.5 HF:7 H2O. The hydrothermal reaction temperature is 160°C and the reaction time is 120 hours. After crystallization, the reactants are centrifuged, washed with water, dried overnight at 110°C, and calcined at 550°C in air for 8 hours to obtain the all-silicon ITH raw powder. The size of the raw ITH powder is primarily distributed between 1 and 3 μm.

[0036] Low temperature nitrogen adsorption characterization (using Micromeritics ASAP 2020 specific surface area and pore size distribution analyzer at 77K) shows that the molecular sieve is mainly composed of micropores in the low pressure area and stacked pores in the high pressure area, with a BET of 407m 2 / g, HK median pore width 0.52nm, t-plot surface area 50m 2 / g, micropore volume is 0.17cm 3 / g.

[0037] 2) Add binder for granulation

[0038] The calcined all-silicon ITH raw powder, water, and binder (acrylate latex A, 50% solids content) were mixed into a slurry at a mass ratio of 48:50:12. The slurry was then spray-dried using a 400μm nozzle (180°C at the top, 140°C at the bottom, and a spray pressure of 0.3 MPa) to produce all-silicon ITH granules. Sieving yielded granules with a diameter of 270-330μm, designated Sample 1 (average diameter 300μm), and subjected to the following tests.

[0039] 3) Acoustic performance measurement:

[0040] A commercially available 1115-type loudspeaker was used, the volume of the tooling back cavity was 0.4 cubic centimeters (0.4 cc for short), and it was 100% canned. Specific data are shown in Table 1.

[0041] Acoustic effect Figure 2 After adding all-silicon ITH molecular sieve (sample 1) to the rear cavity of the speaker, the sound pressure value in the low-frequency band is significantly improved, and the resonant frequency also moves significantly to the low-frequency band.

[0042] Nitrogen adsorption and desorption of all-silicon ITH molecular sieve powder at room temperature Figure 1 As shown, when tested at room temperature (25°C) (using Micromeritics ASAP 2020 specific surface area and pore size distribution meter), the ITH adsorption amount is 15-20% higher than that of the existing comparative example 1; the acoustic effect is about 10-15% higher than that of comparative example 1, which is basically corresponding to the nitrogen adsorption at room temperature.

[0043] Example 2

[0044] This example prepares a boron-containing ITH molecular sieve (containing B ITQ-13, with a Si / B ratio of 500) and applies it to a speaker to test its acoustic performance, including the following process:

[0045] 1) Preparation of boron-containing ITH molecular sieve (containing B ITQ-13, Si / B ratio of 500):

[0046] Boric acid was added as a boron source based on Example 1, with a specific ratio of 1SiO2:0.002 boric acid:0.5 hexamethonium hydroxide:0.5HF:7H2O, a hydrothermal reaction temperature of 160°C, and a reaction time of 120h; the rest was the same as Example 1, to obtain boron-containing ITH molecular sieve raw powder.

[0047] Low temperature nitrogen adsorption characterization (using Micromeritics ASAP 2020 specific surface area and pore size distribution analyzer at 77K) shows that the molecular sieve is mainly composed of micropores in the low pressure area and stacked pores in the high pressure area, with a BET of 378m 2 / g, HK median pore width 0.51nm, t-plot surface area 60m 2 / g, micropore volume is 0.15cm 3 / g.

[0048] 2) Add binder for granulation

[0049] The calcined boron-containing ITH raw powder, water, and binder (acrylate latex A, 50% solids content) were mixed into a slurry at a mass ratio of 48:50:12. The slurry was then spray-dried using a 400μm nozzle (180°C at the top, 140°C at the bottom, and a spray pressure of 0.3 MPa) to produce boron-containing ITH granules. Sieving yielded granules with a diameter of 270-330μm, designated Sample 2 (average diameter 300μm), and subjected to the following tests.

[0050] 3) Acoustic performance measurement:

[0051] A commercially available 1115-type loudspeaker was used, the volume of the tooling back cavity was 0.4 cubic centimeters (0.4 cc for short), and it was 100% canned. Specific data are shown in Table 1.

[0052] Example 3

[0053] This example prepares an aluminum-containing ITH molecular sieve (containing Al ITQ-13 with a Si / Al ratio of 500) and applies it to a speaker to test its acoustic performance, including the following process:

[0054] 1) Preparation of aluminum-containing ITH molecular sieve (containing Al ITQ-13, Si / Al ratio of 500):

[0055] On the basis of Example 1, sodium aluminate was added as an aluminum source, with a specific ratio of 1SiO2:0.002 sodium aluminate:0.5 hexamethonium hydroxide:0.5HF:7H2O, a hydrothermal reaction temperature of 160°C, and a reaction time of 120h; the rest was the same as in Example 1, to obtain aluminum-containing ITH molecular sieve raw powder.

[0056] Low temperature nitrogen adsorption characterization see Figure 3 As shown, low temperature nitrogen adsorption characterization (using Micromeritics ASAP2020 specific surface area and pore size distribution analyzer at 77K) is performed by Figure 3 It can be seen that the molecular sieve is mainly composed of micropores in the low-pressure area and stacked pores in the high-pressure area, with a BET of 417m 2 / g, HK median pore width 0.50nm, t-plot surface area 102m 2 / g, micropore volume is 0.16cm 3 / g.

[0057] 2) Add binder for granulation

[0058] The calcined aluminum-containing ITH raw powder, water, and a binder (acrylate latex A, 50% solids content) were mixed into a slurry at a ratio of 48:50:12. The slurry was then spray-dried using a 400μm nozzle (180°C at the top, 140°C at the bottom, and a spray pressure of 0.3 MPa) to produce aluminum-containing ITH granules. Sieving with a sieve yielded granules with a diameter of 270-330μm, designated Sample 3 (average diameter 300μm), and subjected to the following tests.

[0059] 3) Acoustic performance measurement:

[0060] A commercially available 1115-type loudspeaker was used, the volume of the tooling back cavity was 0.4 cubic centimeters (0.4 cc for short), and it was 100% canned. Specific data are shown in Table 1.

[0061] Example 4

[0062] This example prepares an aluminum-containing ITH molecular sieve (containing Al ITQ-13 with a Si / Al ratio of 200) and applies it to a loudspeaker to test its acoustic performance, including the following process:

[0063] 1) Preparation of aluminum-containing ITH molecular sieve (containing Al ITQ-13, Si / Al ratio of 200):

[0064] On the basis of Example 1, sodium aluminate was added as an aluminum source, with a specific ratio of 1SiO2:0.005 sodium aluminate:0.5 hexamethonium hydroxide:0.5HF:7H2O, a hydrothermal reaction temperature of 160°C, and a reaction time of 120h; the rest was the same as in Example 1, to obtain aluminum-containing ITH molecular sieve raw powder.

[0065] Low temperature nitrogen adsorption characterization (using Micromeritics ASAP 2020 specific surface area and pore size distribution analyzer at 77K) shows that the molecular sieve is mainly composed of micropores in the low pressure area and stacked pores in the high pressure area, with a BET of 383m 2 / g, HK median pore width 0.50nm, t-plot surface area 87m 2 / g, micropore volume is 0.13cm 3 / g.

[0066] 2) Add binder for granulation

[0067] The calcined aluminum-containing ITH raw powder, water, and binder (acrylate latex A, 50% solids content) were mixed into a slurry at a ratio of 48:50:12. The slurry was then spray-dried using a 400μm nozzle (180°C at the top, 140°C at the bottom, and a spray pressure of 0.3 MPa) to produce aluminum-containing ITH granules. Sieving with a sieve yielded granules with a diameter of 270-330μm, designated Sample 4 (average diameter 300μm), and subjected to the following tests.

[0068] 3) Acoustic performance measurement:

[0069] A commercially available 1115-type loudspeaker was used, the volume of the tooling back cavity was 0.4 cubic centimeters (0.4 cc for short), and it was 100% canned. Specific data are shown in Table 1.

[0070] Example 5

[0071] The amount of boric acid was adjusted based on Example 2 to prepare a boron-containing ITH molecular sieve with a Si / B ratio of 100. Granule sample 5 was formed by granulation. The acoustic properties are shown in Table 1.

[0072] Example 6

[0073] The amount of boric acid was adjusted based on Example 2 to prepare a boron-containing ITH molecular sieve with a Si / B ratio of 250. The granule sample 6 was formed by granulation. The acoustic properties are shown in Table 1.

[0074] Example 7

[0075] The ITH molecular sieve obtained in Example 3 was exchanged with 2M ammonium nitrate solvent at 80°C for 6 hours, with the molecular sieve to solution ratio being 1:10. After the exchange, the molecular sieve was washed with water 4 times, dried, and calcined to obtain the hydrogenated ITH molecular sieve.

[0076] Granule sample 7 was obtained by molding and granulation according to the molding conditions of Example 1. The acoustic properties are shown in Table 1.

[0077] Example 8

[0078] The ITH molecular sieve obtained in Example 3 was exchanged with a lithium salt to obtain the lithium-type ITH molecular sieve. The specific conditions were: 2M lithium chloride solvent at 80°C for 6 hours, with a molecular sieve to solution ratio of 1:10. After the exchange, the sieve was washed with water four times, dried, and calcined to obtain the lithium-type ITH molecular sieve.

[0079] Granule sample 8 was obtained by molding and granulation according to the molding conditions of Example 1. The acoustic properties are shown in Table 1.

[0080] Example 9

[0081] The ITH molecular sieve obtained in Example 3 was exchanged with sodium salt to obtain the sodium form. The specific conditions were: 2M sodium chloride solvent at 80°C for 6 hours, with a molecular sieve to solution ratio of 1:10. After the exchange, the mixture was washed with water four times, dried, and calcined to obtain the sodium form of the ITH molecular sieve.

[0082] Granule sample 9 was obtained by molding and granulation according to the molding conditions of Example 1. The acoustic properties are shown in Table 1.

[0083] Example 10

[0084] The ITH molecular sieve obtained in Example 3 was exchanged with potassium salt to obtain the potassium form. The specific conditions were: 2M potassium chloride solvent at 80°C for 6 hours, with a molecular sieve to solution ratio of 1:10. After the exchange, the mixture was washed with water four times, dried, and calcined to obtain the potassium form of the ITH molecular sieve.

[0085] The pellet sample 10 was obtained by molding and granulation according to the molding conditions of Example 1. The acoustic properties are shown in Table 1.

[0086] Example 11

[0087] The ITH molecular sieve obtained in Example 3 was exchanged with both potassium and sodium salts to form a mixed potassium-sodium type. The specific conditions were: a solution containing 1M potassium chloride and 1M sodium chloride, exchanged at 80°C for 6 hours, and a molecular sieve to solution ratio of 1:10. After exchange, the solution was washed four times with water, dried, and calcined to obtain the potassium-sodium type ITH molecular sieve.

[0088] Granule sample 11 was obtained by molding and granulation according to the molding conditions of Example 1. The acoustic properties are shown in Table 1.

[0089] Example 12

[0090] The ITH molecular sieve obtained in Example 2 was exchanged with magnesium salt to obtain the magnesium-type ITH molecular sieve. The specific conditions were: 2M magnesium chloride solvent at 80°C for 6 hours, with a molecular sieve to solvent ratio of 1:10. After the exchange, the mixture was washed with water four times, dried, and calcined to obtain the magnesium-type ITH molecular sieve.

[0091] Granule sample 12 was obtained by molding and granulation according to the molding conditions of Example 1. The acoustic properties are shown in Table 1.

[0092] Example 13

[0093] The ITH molecular sieve obtained in Example 2 was exchanged with both magnesium and sodium salts to form a mixed magnesium-sodium type. The specific conditions were: the solution contained 1M magnesium chloride and 1M sodium chloride, the exchange was performed at 80°C for 6 hours, and the molecular sieve:solution ratio was 1:10. After the exchange, the solution was washed four times with water, dried, and calcined to obtain the magnesium-sodium type ITH molecular sieve.

[0094] Granule sample 13 was obtained by molding and granulation according to the molding conditions of Example 1. The acoustic properties are shown in Table 1.

[0095] Comparative Example 1

[0096] Disassemble the commercially available Apple X generation mobile phone speaker and take out the comparative sample 1 particles from the rear cavity for comparative testing. The acoustic performance is shown in Table 1. The room temperature nitrogen adsorption performance is shown in Table 1. Figure 1 As shown (the sample was baked to remove the organic glue before testing).

[0097] The acoustic performance is shown in Table 1.

[0098] Table 1. Resonant frequency F0 and Q value before and after adding molecular sieve to the rear cavity of the speaker

[0099]

[0100] It can be seen from Table 1 that the overall performance of the ITH molecular sieve is improved by 15-20 Hz compared with the comparative sample 1, and the low-frequency effect is significantly enhanced, indicating that the ITH molecular sieve of the present invention has significant technical progress in acoustic performance.

[0101] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. An ITH molecular sieve improved speaker, characterized in that: The rear cavity of the speaker is filled with ITH molecular sieve; The ITH molecular sieve is composed of a framework and extra-framework cations, wherein the framework includes silicon dioxide and an oxide of a non-silicon element M, with a Si / M molar ratio of at least 80; the non-silicon element M is B or Al; The ITH molecular sieve contains uniform micropores with a micropore size of 0.4 nm to 0.55 nm and a micropore volume of 0.15 to 0.25 cm 3 / g.

2. The loudspeaker according to claim 1, wherein The extra-framework cations are selected from at least one of H ions, alkali metal ions, or alkaline earth metal ions; The content of the extra-framework cations is 0.05 wt.% to 1.5 wt.%.

3. The loudspeaker according to claim 1, wherein The particle size of the ITH molecular sieve is greater than 10 nanometers.

4. The loudspeaker according to claim 1, wherein The particle size of the ITH molecular sieve is greater than 100 nanometers.

5. The loudspeaker according to claim 3, characterized in that The particle size of the ITH molecular sieve is less than 10 microns.

6. The loudspeaker according to claim 3, characterized in that The particle size of the ITH molecular sieve is less than 7 microns.

7. The loudspeaker according to any one of claims 1 to 6, characterized in that: In the rear cavity, a binder is added to the ITH molecular sieve to form it into a specific shape.

8. The loudspeaker according to claim 7, characterized in that The specific shapes include: granular, flake or block.

9. The loudspeaker according to claim 8, characterized in that The size of the particles in the specific shape is 80 μm to 2000 μm.

10. The loudspeaker according to claim 8, characterized in that The size of the particles in the specific shape is 100 μm to 1500 μm.

11. The loudspeaker according to claim 8, wherein The sheet in the specific shape has a thickness of 100 μm to 1000 μm, and a length and a width of 3 mm to 100 mm.

12. The loudspeaker according to claim 8, wherein The block in the specific shape has a thickness of 1 mm to 20 mm, and a length and width of 3 mm to 100 mm.

13. The loudspeaker according to any one of claims 1 to 6, characterized in that: The framework of the ITH molecular sieve does not contain oxides of the non-silicon element M.

14. An electronic device, characterized in that: The electronic device comprises the speaker according to any one of claims 1 to 13.

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