A speaker and electronic device improved with high-density FER molecular sieve

Abstract

The present invention discloses a speaker and electronic device improved with a high-density FER molecular sieve. The rear cavity of the speaker is filled with a high-density FER molecular sieve; the raw powder of the FER molecular sieve has a non-flake micromorphology, a thickness-to-width ratio of ≥1:20 and <1:1, and a loose bulk density greater than 0.15 g / cm 3 The speaker provided by the present invention is filled with a high-density FER molecular sieve with a specific raw powder morphology in the back cavity, which increases the acoustic compliance of the air in the back cavity, thereby improving the performance of the speaker in the low frequency band.

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 a high-density FER 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] Generally, FER zeolite is also called ferrierite. Its synthetic Si / Al ratio is between 8-30, its morphology is flake-like, and its loose bulk density is 0.15 g / cm 3 There are also a few reports on the synthesis of FER with Si / Al ratio greater than 100 or even all-silicon in the hydrogen fluoride system, but the morphology is still thin, with a width of more than 20μm and a thickness of about 1μm. The acoustic effect of this type of FER is very poor due to the large size of the flakes. There are also a few reports on the introduction of seed crystals to obtain high-silicon small-plate FER, such as small-plate FER with a thickness of less than 100nm, a width and length of 2-6μm. This type of FER overcomes the problem of poor acoustic effect of large flakes, but because the morphology is still thin, the bulk density is very low, only 0.15g / cm 3 Because the volume of the rear cavity of the speaker system is limited and cannot be filled with high density, the acoustic effect per unit volume is still insufficient. The present invention solves the above problems of FER by controlling the FER morphology to obtain high-density FER. Summary of the Invention

[0005] The purpose of the present invention is to provide a speaker and electronic equipment improved with high-density FER molecular sieve. The rear cavity of the speaker is filled with high-density FER molecular sieve material. The addition of this material can significantly improve the low-frequency performance of the speaker, and in practical applications, the material has strong resistance to performance attenuation.

[0006] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0007] In one aspect, the present invention provides a high-density FER molecular sieve improved loudspeaker, wherein the rear cavity of the loudspeaker is filled with a high-density FER structure molecular sieve;

[0008] The raw powder of the FER molecular sieve has a non-flake micromorphology, a thickness-to-width ratio of ≥1:20 and <1:1, and a loose bulk density greater than 0.15 g / cm 3 .

[0009] The loose bulk density of molecular sieve raw powder is mainly related to the molecular sieve structure, crystallinity, raw powder size, and raw powder morphology. The present invention changes the traditional FER flake morphology into granular or thick flake morphology while ensuring crystallinity to obtain a high-density raw powder morphology. The loose bulk density of the FER molecular sieve is preferably 0.20 g / cm 3 ~0.8g / cm 3 .

[0010] In the present invention, the thickness, width and length of the original powder microstructure of the FER molecular sieve are defined as follows: in three-dimensional space, the smallest dimension is defined as thickness, the next smallest dimension is defined as width, and the longest dimension is defined as length.

[0011] According to the speaker of the present invention, preferably, the thickness-to-width ratio of the FER molecular sieve is ≥ 1:15; more preferably, ≥ 1:10. Further preferably, the thickness-to-width ratio of the FER molecular sieve is ≥ 1:10 and ≤ 1:2. Even more preferably, the thickness-to-width ratio of the FER molecular sieve is ≥ 1:5 and ≤ 1:2.

[0012] According to the loudspeaker of the present invention, preferably, the raw powder of the FER molecular sieve has a non-sheet morphology such as thick flakes (thickness to width ratio ≥1:20 and <1:1; preferably ≥1:5 and ≤1:2), ellipsoids, spheres, blocks, columns, etc.

[0013] According to the loudspeaker of the present invention, preferably, the particle size of the FER molecular sieve (defined by the longest side) is ≥50 nm, more preferably ≥100 nm.

[0014] According to the loudspeaker of the present invention, preferably, the particle size of the FER molecular sieve (defined by the longest side) is ≤20 μm, preferably ≤10 μm.

[0015] According to the speaker of the present invention, the FER molecular sieve preferably consists primarily of a framework and extra-framework cations, wherein the framework is primarily composed of silicon dioxide and oxides of non-silicon atoms M; wherein the Si / M molar ratio is at least 80, preferably at least 100. M preferably includes, but is not limited to, at least one of Al, Fe, B, Ti, Zr, Ga, Cr, and Mo, more preferably Al. The extra-framework cations are preferably at least one of H ions, alkali metal ions, alkaline earth metal ions, and transition metal ions, more preferably at least one of Li, Na, K, Ba, Ca, Mg, Cu, Zn, and Ag. The content of the extra-framework cations is 0.05 wt.% to 1.5 wt.%.

[0016] Typically, the framework chemical composition of FER molecular sieves is primarily composed of silicon dioxide and aluminum oxide. A Si / Al ratio below 80 significantly absorbs moisture from the air, occupying most of the molecular sieve's micropores and resulting in no low-frequency improvement. Higher Si / Al ratios, while lower in water absorption, present significant synthesis difficulties and are prone to the formation of impurities such as quartz and ZSM-5. Preferably, in the FER molecular sieve, M is Al, and the Si / Al molar ratio is greater than 80, more preferably greater than 100.

[0017] Typically, FER molecular sieves are exchanged with cations before use, resulting in different types of FER molecular sieves. Ammonium salts, alkali metal salts, or alkaline earth metal salts are commonly used to exchange with the molecular sieve. Ammonium salts primarily include ammonium chloride, ammonium nitrate, ammonium sulfate, and ammonium carbonate; alkali metal salts primarily include lithium salts, sodium salts, potassium salts, and rubidium salts; and anions of alkali metal salts include chloride, sulfate, and nitrate. Alkaline earth metal salts primarily include magnesium salts, calcium salts, and barium salts; and anions of alkali metal salts include chloride, sulfate, and nitrate.

[0018] In the speaker of the present invention, preferably, a binder is added to the FER molecular sieve and molded into a specific shape in the rear cavity to prevent the raw sieve powder from entering the speaker unit. These specific shapes include granules (spherical, ellipsoidal, ellipsoidal with a central pit, irregular granules, etc.), flakes, and blocks. Flakes and blocks can be installed first, followed by assembly of the rear cavity. Granular shapes are generally installed after assembly of the rear cavity.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] Typically, directly synthesized FER molecular sieves are in the form of powders smaller than 10 μm. Most of them need to be molded into a specific shape with a binder before being placed in the back cavity of a speaker. Using the raw powder directly without forming it will cause it to enter the speaker unit, affecting speaker performance. During the molecular sieve molding process, it is usually necessary to add the desired shaped molecular sieve, solvent, binder, and additives. 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 additive refers to other substances added in very small amounts, usually less than 5%.

[0023] The loudspeaker provided by the present invention has a rear cavity filled with a high-density FER molecular sieve with a specific raw powder morphology, which increases the acoustic compliance of the air in the rear cavity, thereby improving the performance of the loudspeaker in the low frequency band.

[0024] 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

[0025] Figure 1 This is the XRD pattern of the raw powder sample 1 prepared in Example 1.

[0026] Figure 2 This is the SEM image of the original powder sample 1 prepared in Example 1.

[0027] Figure 3 This is the low-temperature nitrogen adsorption diagram of the original powder sample 1 prepared in Example 1.

[0028] Figure 4 This is the SEM image of the original powder sample 1 prepared in Example 2.

[0029] Figure 5 This is the SEM image of the low-density small-piece high-silicon comparison sample 2 molecular sieve in comparative example 2.

[0030] Figure 6 This is the SEM image of the large-scale high-silicon molecular sieve comparison sample 3 in comparative example 3.

[0031] Figure 7 This is a comparison chart of nitrogen adsorption at room temperature between the original powder sample 1 in Example 1 and the comparison sample 1 in Comparative Example 1.

[0032] Figure 8 The comparison chart of the frequency response curve and impedance curve of sample 1 with and without particles added to the rear cavity of the speaker. DETAILED DESCRIPTION

[0033] 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.

[0034] 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."

[0035] Example 1

[0036] This example prepares a high-density FER molecular sieve and applies it to a speaker to test its acoustic performance, including the following process:

[0037] 1) Preparation of FER molecular sieve:

[0038] Sodium silicate is used as a silicon source (modulus 3.3, 7.9% Na2O 27% SiO2), aluminum sulfate is used as an aluminum source, sodium hydroxide is used as an alkali source for mineralizer 1, sodium fluoride is used as a fluorine source for mineralizer 2, pyrrolidine is used as a template agent, lysine and sulfuric acid are used as regulators, and water is used as a solvent. The specific conditions and methods are as follows: ① Sodium silicate, water, sodium hydroxide, sodium fluoride and pyrrolidine (Pyr) are mixed and stirred in sequence to obtain a viscous liquid A; ② Aluminum sulfate, lysine (Lysine) and sulfuric acid are added to water at once to obtain a solution B; ③ Solution B is slowly added dropwise to solution A. The mixture was stirred at room temperature for 2 h to prepare a gel liquid with a molar ratio of 1.0SiO2:0.0033Al2O3:0.015Na2O:0.4NaF:0.4Pyr:0.1H2SO4:0.02Lysine:24H2O, and then crystallized at 160°C for 96 h. The crystallized reactant was centrifuged, washed with water, dried at 100°C overnight and calcined at 600°C for 15 h to obtain a sodium-type FER molecular sieve raw powder (Si / Al ratio of 150), which was recorded as raw powder sample 1.

[0039] The XRD pattern of the raw powder obtained after calcination is directly tested, such as Figure 1 As shown, the prepared molecular sieve structure is indeed FER molecular sieve.

[0040] Figure 2 The SEM image of the original powder after calcination is Figure 2 It can be seen that the main raw powder size is about 1 μm thick, 4-6 μm long and wide, and the ratio of thickness to width is about 1:5. The calcined raw powder is slowly poured into a 100 mL graduated cylinder until it is flush with the 100 mL scale line. The mass is 41 g, and the corresponding loose bulk density is 0.41 g / cm 3 .

[0041] Figure 3 To characterize the low-temperature nitrogen adsorption of the calcined raw powder (using Micromeritics ASAP 2020 specific surface area and pore size distribution analyzer at 77K), Figure 3 It can be seen that the molecular sieve is mainly composed of micropores in the low-pressure zone, with a BET of 369m 2 / g.

[0042] Figure 7 The nitrogen adsorption and desorption of the calcined raw powder at room temperature (tested at 298K using Micromeritics ASAP 2020 specific surface area and pore size distribution analyzer) showed that the adsorption amount was 25% higher than that of comparative sample 1.

[0043] 2) Add binder to form granules

[0044] The calcined 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 400 μm nozzle (180°C at the top, 140°C at the bottom, and a spray pressure of 0.3 MPa) to produce FER particles. Screening yielded particles with a diameter of 270-330 μm, designated as particle sample 1 (average diameter 300 μm).

[0045] 3) Acoustic performance measurement:

[0046] The commercially available 1115 speaker is used, the back cavity volume of the tooling is 0.4 cubic centimeters (0.4cc for short), and it is 100% canned. The specific data is shown in Table 1. The acoustic low-frequency effect is improved by about 25Hz compared with the comparative example 1; the SPL sound pressure frequency response curve is shown in Figure 8 After adding this material, the sound pressure value in the low frequency band is significantly improved.

[0047] Example 2

[0048] This example prepares a high-density FER molecular sieve and applies it to a speaker to test its acoustic performance, including the following process:

[0049] 1) Preparation of FER molecular sieve:

[0050] Based on Example 1, the ratio of sulfuric acid was adjusted from 0.1H2SO4 to 0.14, and the rest was the same as Example 1. The raw molecular sieve powder obtained after calcination was recorded as raw powder sample 2.

[0051] Figure 4 is the SEM spectrum of the original powder sample 2, Figure 2 It can be seen that the main raw powder size is about 1 μm thick, 4-6 μm long and wide, and the ratio of thickness to width is about 1:5. The loose bulk density of raw powder sample 2 is 0.39 g / cm 3 .

[0052] 2) Add binder to form granules

[0053] The molding ratio, conditions and equipment are the same as those in Example 1, and particle sample 2 (average diameter 300 μm) is obtained by molding.

[0054] 3) Acoustic performance measurement:

[0055] 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.

[0056] Example 3

[0057] This example prepares a high-density FER molecular sieve and applies it to a speaker to test its acoustic performance, including the following process:

[0058] 1) Preparation of FER molecular sieve:

[0059] Sodium silicate was used as silicon source (modulus 3.3, 7.9% Na2O 27% SiO2), aluminum sulfate as an aluminum source, sodium fluoride as a mineralizer and a fluorine source, pyrrolidine as a template agent, lysine and sulfuric acid as regulators, and water as a solvent. The specific conditions and methods are as follows: ① Sodium silicate, water, sodium hydroxide, sodium fluoride and pyrrolidine (Pyr) are mixed and stirred in sequence to obtain a viscous liquid A; ② Aluminum sulfate, lysine (Lysine) and sulfuric acid are added to water at once to obtain a solution B; ③ Solution B is slowly added dropwise to solution A and stirred at room temperature for 2 hours to form a gel liquid with a molar ratio of 1.0SiO2:0.0033Al2O3:0.4NaF:0.4Pyr:0.1H2SO4:0.02Lysine:24H2O, and then reacted and crystallized at 160°C for 120 hours; the crystallized reactant is centrifuged, washed with water, dried and calcined to obtain sodium-type FER raw powder (Si / Al ratio is 150); 2M After exchanging with NH4Cl solution at 70℃ for 6h, the raw FER powder was calcined at 550℃ for 2h to obtain hydrogen-type FER powder, which is designated as raw powder sample 3.

[0060] The main raw powder size of raw powder sample 3 (hydrogen-type FER molecular sieve raw powder) is about 2 μm thick, 4-6 μm long and wide, and the ratio of thickness to width is about 1:2; the loose bulk density is 0.46 g / cm 3 .

[0061] 2) Add binder to form granules

[0062] The calcined 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 300 μm nozzle (180°C at the top, 140°C at the bottom, spray pressure 0.4 MPa) to produce FER granules. Sieving with a sieve yielded granules with a diameter of 80-120 μm, designated as granule sample 3 (average diameter 100 μm).

[0063] 3) Acoustic performance measurement:

[0064] 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.

[0065] Example 4

[0066] This example prepares a high-density FER molecular sieve and applies it to a speaker to test its acoustic performance, including the following process:

[0067] 1) Preparation of FER molecular sieve:

[0068] On the basis of Example 1, the ratio of lysine was adjusted from 0.02 to 0.01, and the rest was the same as Example 1 to obtain raw powder sample 4.

[0069] The main raw powder size of raw powder sample 4 is about 338nm thick, 4-6μm long and wide, and the ratio of thickness to width is about 1:15; the loose bulk density is 0.32g / cm 3 .

[0070] 2) Add binder to form granules

[0071] The prepared FER molecular sieve raw powder was granulated according to the conditions of Example 3 to form particle sample 4 with an average particle diameter of 100 μm.

[0072] 3) Acoustic performance measurement:

[0073] 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.

[0074] Example 5

[0075] This example prepares a high-density FER molecular sieve and applies it to a speaker to test its acoustic performance, including the following process:

[0076] 1) Preparation of FER molecular sieve:

[0077] On the basis of Example 1, the ratio of lysine was adjusted from 0.02 to 0.00 (no lysine was added), and the other conditions were the same as in Example 1 to obtain raw powder sample 5; the raw powder size was about 250 nm in thickness, 4-6 μm in length and width, the ratio of thickness to width was about 1:20, and the loose bulk density was 0.21 g / cm 3 .

[0078] 2) Add binder to form granules

[0079] The prepared FER molecular sieve raw powder was granulated according to the conditions of Example 3 to form particle sample 5 with an average particle diameter of 100 μm.

[0080] 3) Acoustic performance measurement:

[0081] 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.

[0082] Example 6

[0083] This example prepares a high-density FER molecular sieve and applies it to a speaker to test its acoustic performance, including the following process:

[0084] 1) Preparation of FER molecular sieve:

[0085] On the basis of Example 1, the ratio of lysine was adjusted from 0.02 to 0.07, and the rest was the same as Example 1, to obtain raw powder sample 6.

[0086] The main raw powder size of raw powder sample 6 is about 5 μm thick, 8-20 μm long and wide, and the ratio of thickness to width is about 1:3; the loose bulk density is 0.69 g / cm 3 .

[0087] 2) Add binder to form granules

[0088] The prepared FER molecular sieve was granulated according to the conditions of Example 1 to form particle sample 6 with an average particle diameter of 300 μm.

[0089] 3) Acoustic performance measurement:

[0090] 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.

[0091] Comparative Example 1

[0092] 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 nitrogen adsorption at room temperature is shown in Table 1. Figure 7 As shown (the sample was calcined to remove the organic glue before measuring in nitrogen at room temperature).

[0093] Comparative Example 2

[0094] This comparative example tests the acoustic performance of low-density small-piece high-silicon comparative sample 2.

[0095] Comparative flake sample 2 was synthesized using fumed silica, sodium metaaluminate, NaF, pyridine, NaOH, FER seed crystals, and water in a molar ratio of 1.0SiO2:0.0033Al2O3:0.8NaF:1.5Py:0.025Na2O:0.05FER seed crystals:24H2O. The Si / Al ratio was 150, and the raw powder flake dimensions were: thickness of approximately 50-100 nm, width of approximately 2-4 μm, length of approximately 3-6 μm, with a width-to-thickness ratio of approximately 1:30, and a loose bulk density of 0.14 g / cm3. 3 .

[0096] Acoustic properties are shown in Table 1, SEM images are shown in Figure 5 shown.

[0097] Comparative Example 3

[0098] This comparative example tests the acoustic performance of a large piece of high-silicon comparative sample 3.

[0099] Large, high-silicon comparative sample 3 was synthesized using fumed silica, sodium metaaluminate, NaF, pyridine, NaOH, and water in a molar ratio of 1.0SiO2:0.0033Al2O3:0.8NaF:1.5Py:0.025Na2O:24H2O. The Si / Al ratio was 150. For specific synthesis conditions, see [Kamimura Y, Kowenje C, Yamanaka K, et al. Synthesis of hydrophobicsiliceous ferrierite by using pyridine and sodium fluoride[J]. Microporous Mesoporous Mater., 2013, 181:154-159]. The original powder flake dimensions were approximately 1 μm thick, 35 μm wide, and 60 μm long, with a width-to-thickness ratio of approximately 1:35 and a loose bulk density of 0.46 g / cm3. 3 , acoustic properties are shown in Table 1, SEM images are shown in Figure 6 shown.

[0100] Table 1 Resonance frequency F0 before and after adding molecular sieve to the rear cavity of the speaker

[0101]

[0102] Table 1 shows that Examples 1 and 2 of the present invention achieve approximately 25Hz more low-frequency improvement than Comparative Example 1, significantly improving performance. However, the raw powder size of Comparative Example 1 is too large, limiting diffusion and limiting effectiveness. Comparative Example 2, primarily due to its low density, packs only about one-third the mass of a normal packing, failing to pack the same mass into the limited back cavity of the speaker, resulting in significantly inferior acoustic performance compared to Comparative Example 1, Example 1, and Example 2. Comparative Example 3 exhibits a large flake FER morphology. FER molecular sieves are inherently two-dimensional pore-forming molecular sieves, making diffusion easily restricted by their outer surface. Diffusion is particularly restricted when the raw powder size is too large, resulting in the worst acoustic performance.

[0103] Example 7

[0104] The raw powder in Example 1 was prepared into a slurry at a mass ratio of 48:50:12 with water and a binder (acrylate latex A, solid content 50%). A rectangular block of melamine foam (9 mm wide, 6 mm high, 14 mm long) was placed in the slurry to soak and absorb the slurry, and then dried to obtain a block of FER (weighing 0.30-0.33 g).

[0105] Acoustic f0 measurements were conducted in a 1cc speaker test fixture. Adding block-form FER reduced the f0 from 810Hz to 660Hz. Adding 0.3g of the granules from Example 1 to the 1cc fixture also reduced the f0 from 810Hz to 640Hz. This comparison shows that while block-form FER has slightly inferior acoustic performance to granular FER, it still significantly improves low-frequency performance.

[0106] Example 8

[0107] The raw powder in Example 1 was prepared into a concentrated slurry according to the mass ratio of raw powder, water, and binder (acrylate latex A, solid content 50%) of 48:35:24. The slurry was then coated on a PP film as a bottom mold and dried to obtain a sheet of about 150 μm thick (cut into thin sheets of 14 mm in length and 9 mm in width, weighing about 0.006-0.008 g);

[0108] An acoustic f0 test was conducted on a 1cc speaker test fixture. After adding four sheets of sheet FER, the fixture's f0 dropped from 810Hz to 700Hz, indicating that sheet molding still has a significant low-frequency improvement effect.

[0109] 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. A high-density FER molecular sieve improved loudspeaker, characterized in that: The rear cavity of the speaker is filled with high-density FER structure molecular sieve; The original powder of the FER molecular sieve has a non-flake micromorphology, a thickness-to-width ratio of ≥1:10 and ≤1:2, and a loose bulk density of 0.20 g / cm 3 ~0.8g / cm 3 ; The particle size of the FER molecular sieve is ≥50 nm and ≤20 μm, and the particle size is defined by the longest side.

2. The loudspeaker according to claim 1, wherein The particle size of the FER molecular sieve is ≥100 nm.

3. The loudspeaker according to claim 1, wherein The particle size of the FER molecular sieve is ≤10 μm.

4. The loudspeaker according to claim 1, wherein The FER molecular sieve is composed of a framework and extra-framework cations, wherein the framework includes silicon dioxide and oxides of non-silicon atoms M; wherein the Si / M molar ratio is at least 80.

5. The loudspeaker according to claim 4, characterized in that The Si / M molar ratio is at least 100.

6. The loudspeaker according to claim 4, characterized in that The non-silicon atom M is Al.

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 FER molecular sieve to form it into a specific shape; the specific shape includes: granular, flake or block.

8. The loudspeaker according to claim 7, characterized in that The size of the particles in the specific shape is 80 μm to 2000 μm.

9. The loudspeaker according to claim 7, characterized in that The size of the particles in the specific shape is 100 μm to 1500 μm.

10. The loudspeaker according to claim 7, 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.

11. The loudspeaker according to claim 7, 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.

12. An electronic device, characterized in that: The electronic device comprises the speaker according to any one of claims 1 to 11.

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