ACOUSTIC REINFORCING MATERIAL BLOCK AND APPLICATION THEREOF, MICRO LOUDSPEAKER AND ELECTRONIC DEVICE

Abstract

Provided in the present application are an acoustic reinforcing material block and an application thereof, a micro loudspeaker and an electronic device. The raw materials of the acoustic reinforcing material block include a porous material, an adhesive, and an adjuvant loaded in a structural framework. The micro loudspeaker comprises an upper housing and a lower housing which form an inner cavity, and a loudspeaker unit located in the inner cavity, wherein the inner cavity is divided into a front cavity and a rear cavity, and the front cavity is in communication with a sound outlet hole; and a front cavity resonant cavity which is in communication with the front cavity and filled with an acoustic enhancing material is provided in the upper housing.

Claims

1. An acoustic reinforcing block, wherein the raw materials for the acoustic reinforcing block comprise a porous material, a framework material, an adhesive, and an adjuvant, the structural framework of the acoustic reinforcing block is formed of a single layer of the framework material or formed by alternating lamination of two or more layers of the framework material, and the porous material, the adhesive and the adjuvant are supported on the structural framework.

2. The acoustic reinforcing block according to claim 1, wherein the raw materials for the acoustic reinforcing block comprise 5-15% of the framework material, 2-10% of the adhesive, 0.05-2% of the adjuvant, and a balance of the porous material, based on 100% by mass of the acoustic reinforcing block, wherein the mass of the adhesive is measured as the solid mass of the adhesive.

3. The acoustic reinforcing block according to claim 1, wherein the acoustic reinforcing block is a single block and/or a block formed by lamination of two or more acoustic reinforcing blocks.

4. The acoustic reinforcing block according to claim 1, wherein the framework material comprises one or a combination of two or more of fibrous paper, fibrous cloth and fibrous felt.

5. The acoustic reinforcing block according to claim 4, wherein the framework material is formed by alternating lamination of layered and/or corrugated fibrous paper, fibrous cloth or fibrous felt.

6. The acoustic reinforcing block according to claim 5, wherein the corrugated fibrous paper, fibrous cloth or fibrous felt has a corrugation height of 0.2 mm to 2 mm.

7. The acoustic reinforcing block according to claim 1, wherein the porous material comprises one or a combination of two or more of zeolite, activated carbon, and MOF materials; the adhesive comprises an organic adhesive and/or an inorganic adhesive; the organic adhesive comprises one or a combination of two or more of a polyacrylate suspension, a polystyrene acetate suspension, a polyvinyl acetate suspension, a polyethylene vinyl acetate suspension, and a polybutadiene rubber suspension; and the inorganic adhesive comprises one or a combination of two or more of a silica sol, an alumina sol, and pseudo-boehmite; the adjuvant comprises one or a combination of two or more of CMC, montmorillonite, kaolin, attapulgite and mica powder; and the framework material comprises chemical fibers; the framework material has a grammage per unit area of 10 g/m.sup.2 to 100 g/m.sup.2.

8. The acoustic reinforcing block according to claim 7, wherein the zeolite has a Si/M mass ratio of 200 or more, wherein the M is a trivalent metallic element.

9. The acoustic reinforcing block according to claim 8, wherein the M comprises one or a combination of two or more of iron, aluminum and titanium.

10. The acoustic reinforcing block according to claim 7, wherein the zeolite comprises one or a combination of two or more of MFI structured molecular sieves, FER structured molecular sieves, CHA structured molecular sieves, IHW structured molecular sieves, IWV structured molecular sieves, ITE structured molecular sieves, UTL structured molecular sieves, VET structured molecular sieves, MEL structured molecular sieves, and MTW structured molecular sieves.

11. The acoustic reinforcing block according to claim 7, wherein the framework material is prepared from chemical fibers by one of blended spinning, bonding, or wet forming; individual fibers in the chemical fibers have a diameter of 2 μm to 40 μm.

12. The acoustic reinforcing block according to claim 11, wherein the chemical fibers comprise inorganic fibers and/or synthetic fibers; the inorganic fibers comprise glass fibers and/or ceramic fibers, and the synthetic fibers comprise one or a combination of two or more of terylene, nylon, acrylic, polypropylene, vinylon, and chlorofibre.

13. Use of the acoustic reinforcing block according to claim 1 in a micro speaker.

14. A micro speaker comprising an upper shell, a lower shell, and a speaker unit, wherein the upper shell and the lower shell form an inner cavity, the speaker unit is located in the inner cavity, and the upper shell is provided with a sound hole at one side; the inner cavity is divided into a front cavity and a rear cavity, wherein the front cavity is a cavity between the top of the speaker and the upper shell, and communicates with the sound hole; and a front cavity resonator is further provided inside the micro speaker, wherein the front cavity resonator is provided with a vent hole communicating with the front cavity, and the front cavity resonator is filled with an acoustic reinforcing material.

15. The micro speaker according to claim 14, wherein the front cavity resonator is provided in the upper shell above the front cavity or provided in the upper shell above the rear cavity; when the front cavity resonator is located in the upper shell above the rear cavity, the upper shell also includes a first retaining wall and a second retaining wall arranged inside the micro speaker, wherein the first retaining wall is used to separate the front cavity and the rear cavity, and the second retaining wall is used to separate the front cavity resonator and the rear cavity.

16. The micro speaker according to claim 15, wherein when the front cavity resonator is located in the upper shell above the front cavity, the internal top surface of the upper shell is provided with a spacing protrusion, and the spacing protrusion is used to separate the front cavity and the rear cavity.

17. The micro speaker according to claim 14, wherein the volume of the acoustic reinforcing material is 10-90% of the total volume of the front cavity resonator.

18. The micro speaker according to claim 17, wherein the volume of the acoustic reinforcing material is 40-60% of the total volume of the front cavity resonator.

19. The micro speaker according to claim 14, wherein the acoustic reinforcing material includes acoustic reinforcing material particles and/or the acoustic reinforcing block; when the front cavity resonator is filled with the acoustic reinforcing block, the interior of the front cavity resonator is provided with a cushioning material that lines the inner wall of the cavity; when the front cavity resonator is filled with the acoustic reinforcing material particles, the vent hole is also provided with a screen cloth.

20. An electronic device comprising the micro speaker according to claim 14.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG. 1 is a schematic diagram of the alternating lamination of a framework material in some embodiments of the present disclosure.

[0049] FIG. 2 is a schematic diagram of the structure of the acoustic reinforcing block of Example 1 when it is located within a front cavity resonator.

[0050] FIG. 3 is a schematic diagram of the structure of the micro speaker of Example 2.

[0051] FIG. 4 is a cross-sectional view in the A-A direction of FIG. 3.

[0052] FIG. 5 is a schematic diagram of the structure of the micro speaker of Example 3.

[0053] FIG. 6 is a schematic diagram of the structure of the micro speaker of Example 3.

[0054] FIG. 7 is a cross-sectional view in the A-A direction of FIG. 5.

[0055] FIG. 8 is a cross-sectional view in the B-B direction of FIG. 5.

[0056] FIG. 9 is a performance test curve of the micro speakers of Example 2 and Comparative Example 1.

REFERENCE NUMBERS OF MAIN COMPONENTS

[0057] 1—upper shell, 2—lower shell, 4—speaker unit, 5—rear cavity, 6—front cavity, 7—sound hole, 8—front cavity resonator, 81—vent hole, 82—acoustic reinforcing material, 11—first casing, 31—second casing, 41—vibrating diaphragm, 61—spacing protrusion, 91—first retaining wall, 92—second retaining wall, 93—protruding platform.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0058] In order to have a clearer understanding of the technical features, objectives and beneficial effects of the present disclosure, the following detailed description of the technical solutions of the present disclosure is provided, but it is not to be construed as limiting the scope of the practicable scope of the present disclosure.

[0059] In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the terms “center”, “upper”, “lower”, “front”, “rear”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside” or the like, is based on the orientation or positional relationship shown in the accompanying drawings and is intended only to facilitate and simplify the description of the disclosure, but not to indicate or imply that the equipment or component referred to must be of a particular orientation or constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present disclosure.

[0060] In addition, the terms “first” and “second” are used for descriptive purposes only and are not to be construed as indicating or implying relative priority or implicitly specifying the number of the indicated technical features. Thus, a feature limited by “first” and “second” may explicitly or implicitly include one or more of such features. In the description of the present disclosure, “a plurality of” means two or more, unless otherwise expressly and specifically limited.

Example 1

[0061] This example provides an acoustic reinforcing block. This material comprises 6.4% of a polyacrylate suspension, 0.1% of CMC, 12.6% of a framework material, and a balance of a porous material, based on 100% by mass in total of the acoustic reinforcing block. The porous material used is a MFI structured molecular sieve with a Si/M mass ratio of 350, where M is aluminum; the framework material used is formed by alternating lamination of layered fibrous paper which is obtained from short-cut alkali-free glass fibers by a wet process and is surface treated with a silane coupling agent KH550. The fibrous paper has a grammage per unit area of 25 g/m.sup.2 and a fiber diameter of 7 μm.

[0062] During the process of preparing the above acoustic reinforcing block, the fibrous paper is first cut to fit the size and shape of the speaker cavity to be filled. Then, the polyacrylate suspension, CMC and MFI molecular sieve are mixed to form a homogeneous slurry. The slurry is used to completely impregnate the cut fibrous paper to obtain a thin block of monolayer acoustic reinforcing material. In some embodiments, it is also possible to obtain an acoustic reinforcing block with a multilayer structural framework by alternating lamination of a plurality of fibrous paper. The internal structure of the block can be as shown in FIG. 1. Additives such as the MFI molecular sieve are located between the layers of the structural framework and penetrate into the interior of the structural framework.

[0063] Further, an acoustic reinforcing block with interlayer gap holes is obtained by stacking the above thin block of monolayer acoustic reinforcing material. FIG. 2 is a schematic diagram of the structure of the acoustic reinforcing block of Example 1 when it is located within the front cavity resonator.

Example 2

[0064] This example provides a micro speaker. FIGS. 3 and 4 are schematic diagrams of the structure of the micro speaker. As shown in FIGS. 3 and 4, the micro speaker comprises an upper shell 1, a lower shell 2 and a speaker unit 4.

[0065] The upper shell 1 and the lower shell 2 are bonded by an adhesive to form a sealed inner cavity. Externally, the upper shell 1 and the lower shell 2 together form a rectangular shell of the micro speaker.

[0066] Here, the lower shell 2 is the bottom casing of the micro speaker.

[0067] The upper shell 1 is the top casing and side casing of the micro speaker, and the top and side of the upper shell 1 is an integrally molded structure. One side of the upper shell 1 is provided with a sound hole 7, and the inner top surface of the upper shell 1 is provided with three vertically downward spacing protrusions 61, which are located on the opposite and adjacent sides of the sound hole 7. The height of the spacing protrusions 61 is smaller than the height of the inner cavity, and the horizontal distance between the spacing protrusions 61 matches the radial dimension of the speaker unit 4.

[0068] The speaker unit 4 is located in the inner cavity and foam is filled between the bottom of the speaker unit and the lower shell 2. The speaker unit 4 is fixed at the top edges thereof between a plurality of spacing protrusions 61 by bonding with an adhesive. The speaker unit 4 includes a vibrating diaphragm 41, a voice coil assembly fixedly connected to the vibrating diaphragm 41 and a magnetic circuit system (not shown in the figures). The vibrating diaphragm 41 is located on the top of the speaker unit 4, and the edge of the vibrating diaphragm 41 is fixed to the magnetic circuit system. The edge of the vibrating diaphragm 41 is provided with an outwardly extending fixing member, which is fastened to the spacing protrusions 61. The space between the vibration diaphragm 41, the spacing protrusions 61, and the top casing of the upper shell 1 forms the front cavity 6, and the remaining space in the inner cavity is the rear cavity 5. Specifically, the rear cavity 5 includes the side of the speaker unit 4 distal to the sound hole 7, the spacing projection 61, the cavity between the upper shell 1 and the lower shell 2, and the cavity between the two sides of the speaker unit 4 and the side casing (the side adjacent to the sound hole).

[0069] The front cavity resonator 8 is located in the upper shell 1 above the center of the front cavity 6. A vent hole 81 is provided at a port on one side of the front cavity resonator 8, and the front cavity resonator 8 communicates with the front cavity 6 through the vent hole 81.

[0070] The side of the front cavity resonator 8 distal to the vent hole 81 is filled with the acoustic enhancement block 82 of Example 1, and the volume of the acoustic enhancement block 82 is 50% of the volume of the front cavity resonator 8. The acoustic enhancement block 82 used in this example has a shape that fits the cavity shell of the front cavity resonator 8, and may be filled in the front cavity resonator 8 in a state as shown in FIG. 2. A cushioning material that lines the inner wall of the cavity may also be provided inside the front cavity resonator 8.

[0071] In some other specific embodiments, the acoustic reinforcing block 82 may be replaced with another acoustic reinforcing material in the form of particles. In this case, the vent hole 81 of the front cavity resonator 8 may also be provided with a screen cloth for separating the acoustic reinforcing material particles from the front cavity 6, while avoiding the acoustic reinforcing material particles from falling off the front cavity resonator 8.

Example 3

[0072] This example provides a micro speaker. FIGS. 5 to 8 are schematic diagrams of the structure of the micro speaker. As shown in FIGS. 5 to 8, the micro speaker comprises an upper shell 1, a lower shell 2 and a speaker unit 4.

[0073] As shown in FIG. 6, the upper shell 1 and the lower shell 2 are bonded to form a sealed inner cavity. Externally, the upper shell 1 and the lower shell 2 together form a rectangular shell of the micro speaker. The upper shell 1 is the top casing, side casing and inner casing of the micro speaker, and the lower shell 2 is the bottom casing of the micro speaker.

[0074] On the basis of the upper shell 1 in Example 2, the upper shell 1 of this example is further provided with a first retaining wall 91, a second retaining wall 92, and an annular protruding platform 93. Specifically, the upper shell 1 of this example includes a first casing 11 and a second casing 31, wherein the first casing 11 is the top casing of the micro speaker, and the second casing (or referred as middle casing) 31 includes the side casing of the micro speaker (hereinafter referred to as “side casing”), the first retaining wall 91, the second retaining wall 92, and the annular protruding platform 93 fixed to the inner wall of the side casing. One side of the second shell 31 is provided with a sound hole 7.

[0075] The first retaining wall 91 and the second retaining wall 92 are provided in the direction extending from the upper shell 11 to the lower shell 2. The first retaining wall 91 is linear in shape.

[0076] The annular protruding platform 93 is provided between the side casing and the first retaining wall 91. The vertical distance between the annular protruding platform 93 and the first casing 11 substantially matches the vertical height of the first retaining wall 91.

[0077] The speaker unit 4 is fixed inside the micro speaker by embedding in the annular protruding platform 93. There is a space between the top surface of the speaker unit 4 and the first casing 11, and a foam is filled between the bottom surface of the speaker unit 4 and the lower shell 2.

[0078] The speaker unit 4 includes a vibrating diaphragm 41, a voice coil assembly fixedly connected to the vibrating diaphragm 41 and a magnetic circuit system (not shown in the figures). The vibrating diaphragm 41 is located on the top of the speaker unit 4, and the edge of the vibrating diaphragm 41 is fixed to the magnetic circuit system. The edge of the vibrating diaphragm 41 is provided with an outwardly extending fixing member, which is fastened to the first retaining wall 91.

[0079] The cavity between the side casing where the sound hole 7 is located, the first casing 11, the speaker unit 4, and the first retaining wall 91 is the front cavity 6, and the cavity in the inner cavity other than the front cavity 6 is the rear cavity 5. Specifically, the rear cavity 5 includes the cavity between the vertical surface where the first retaining wall 91 is located distal to the side of the sound hole 7, the first casing 11, the lower shell 2 and the side casing, and the cavity located on the vertical surface where the first retaining wall 91 is located distal to the side of the sound hole 7 and between the vibration diaphragm 41 and the lower shell 2.

[0080] The second retaining wall 92 which is bending in shape and located in the rear cavity 5, together with the side casing, the first retaining wall 91, and the first casing 11, surround and form the front cavity resonator 8. The front cavity resonator 8 is positioned close to the speaker unit 4 and located in the rear cavity 5 near the side of the front cavity. The front cavity resonator 8 is provided with a vent hole 81 at the first retaining wall 91, and the front cavity resonator 8 communicates with the front cavity 6 through the vent hole 81. The opening size of vent hole 81 is smaller than the height of the front cavity resonator. The acoustic enhancement block 82 of Example 1 is filled at one side of the front cavity resonator 8 distal to the vent hole 81, and the volume of the acoustic enhancement block 82 is 50% of the volume of the front cavity resonator 8. The acoustic enhancement block 82 used in this example has a shape that fits the cavity shell of the front cavity resonator 8, and may be filled in the front cavity resonator 8 in a state as shown in FIG. 2. A cushioning material that lines the inner wall of the cavity may also be provided inside the front cavity resonator 8.

[0081] In some other specific embodiments, the acoustic reinforcing block 82 may be replaced with another acoustic reinforcing material in the form of particles. In this case, the vent hole 81 of the front cavity resonator 8 may also be provided with a screen cloth for separating the acoustic reinforcing material particles from the front cavity 6, while avoiding the acoustic reinforcing material particles from falling off the front cavity resonator 8.

Comparative Example 1

[0082] This comparative example provides a micro speaker having a configuration that is substantially the same as that of the micro speaker of Example 2, except that the front cavity resonator 8 in the micro speaker of this comparative example is not filled with any materials (including not filled with the acoustic enhancement block of Example 1 or other acoustic enhancement materials).

Testing Example 1

[0083] Performance tests was performed on the micro speaker of Example 2 and the micro speaker of Comparative Example 1, and the measured high-frequency frequency response curve is shown in FIG. 9. As can be seen from FIG. 9, compared with the micro speaker without an acoustic enhancement block (Comparative Example 1), the high frequency performance curve of the micro speaker filled with the acoustic enhancement block in the front cavity resonator (Example 2) is flatter, indicating that the acoustic enhancement block filled in the front cavity resonator provides a significant improvement to the sound quality of the micro speaker.