Vibrating plate for sound production device, vibrating diaphragm assembly and sound production device

Abstract

The invention belongs to the technical field of electroacoustics, and particularly relates to a vibrating plate for a sound production device, a vibrating diaphragm assembly and the sound production device, and main body part preparation raw materials of the vibrating plate for the sound production device comprise an aluminum alloy material and a heat dissipation enhancing filler mixed in the aluminum alloy material, the volume fraction of the heat dissipation enhancing filler in the preparation raw materials of the main body part is 5%-50%, the color difference L value of the outer surface of the vibration plate is 30-80, and the emissivity of the vibration plate at the temperature of 100 DEG C is 0.5-0.98. According to the vibration plate for the sound production device, the preparation raw materials comprise the aluminum alloy material and the heat dissipation reinforcing filler mixed in the aluminum alloy material, and at least the problems that an existing vibration plate is low in elasticity modulus and poor in heat dissipation effect can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electroacoustics, and particularly relates to a diaphragm for a sound generating device, a diaphragm assembly and a sound generating device. Background Art

[0002] The diaphragms of existing loudspeakers are mostly formed into a single-layer structure made of engineering plastics or a composite layer structure including aluminum foil + foam + aluminum foil. Such diaphragms are light in weight, but have deficiencies such as low elastic modulus and low high-frequency cut-off frequency. In order to improve the high-frequency vibration frequency response of loudspeakers, some loudspeakers use diaphragms made of aluminum alloy materials.

[0003] Currently, as the requirements for ultra-high frequencies of loudspeakers are getting higher and higher, aluminum alloys are mostly alloyed. Its strength and hardness have been improved to a certain extent compared with pure aluminum, but its elastic modulus has not been significantly improved and is still about 70 GPa, making it difficult to meet the requirements of ultra-high frequencies. On the other hand, the power of the product is getting larger and larger, and the heat generation is getting larger and larger. Although aluminum alloy has a relatively high thermal conductivity, due to its small surface roughness, large gloss, and small thermal radiation coefficient, the heat dissipation effect is poor.

[0004] Therefore, the diaphragms used in existing loudspeakers still need to be improved. Summary of the Invention

[0005] The purpose of the present invention is to provide a diaphragm for a sound generating device, a diaphragm assembly and a sound generating device. The diaphragm for a sound generating device in the present invention can at least improve the problems of low elastic modulus and poor heat dissipation effect existing in the existing diaphragms.

[0006] The first aspect of the present invention provides a diaphragm for a sound generating device. The raw materials for preparing the main body of the diaphragm include an aluminum alloy material and a heat dissipation enhancing filler mixed in the aluminum alloy material. The volume fraction of the heat dissipation enhancing filler in the raw materials for preparing the main body is 5% - 50%. The color difference L value of the outer surface of the diaphragm is 30 - 80, and the emissivity of the diaphragm at 100 °C is 0.5 - 0.98.

[0007] In some embodiments of the present invention, the specific surface area of the heat dissipation enhancing filler is between 10 m 2 / g and 3000 m 2 / g; and / or, the mesh number of the heat dissipation enhancing filler is between 800 mesh and 18000 mesh; and / or, the color difference L value of the heat dissipation enhancing filler is between 0 and 10.

[0008] In some embodiments of the present invention, the emissivity of the heat dissipation enhancing filler at 100 °C is 0.9 - 1; and / or, the elastic modulus of the heat dissipation enhancing filler is between 200 GPa and 1500 GPa.

[0009] In some embodiments of the present invention, the heat dissipation enhancing filler includes at least one of black silicon carbide, graphene, carbon nanotubes, black silica, and boron carbide.

[0010] In some embodiments of the present invention, the shape of the heat dissipation enhancing filler includes one or more of sheet shape, fibrous shape, polyhedral shape, and spherical shape.

[0011] In some embodiments of the present invention, the heat dissipation enhancing filler is obtained through modification treatment, and the modification treatment includes at least one of pre-oxidation treatment, metal plating treatment, acid treatment, alkali treatment, and silane coupling agent treatment.

[0012] In some embodiments of the present invention, after the main body of the vibrating plate is treated by one of passivation, electrophoresis, and anodic oxidation, a treatment layer is formed on at least one side surface thereof.

[0013] In some embodiments of the present invention, the thickness of the treatment layer is between 0.5 μm and 5 μm; and / or, the emissivity of the treatment layer at 100 °C is 0.5 to 1.

[0014] In some embodiments of the present invention, the elastic modulus of the vibrating plate is between 70 GPa and 130 GPa; and / or, the thickness of the vibrating plate is between 5 μm and 500 μm.

[0015] The second aspect of the present invention further provides a diaphragm assembly, which includes a surround and a vibrating plate disposed at the center position of the surround. The vibrating plate is the vibrating plate described in the first aspect, and the surround and the vibrating plate are integrally injection molded or connected by adhesive bonding.

[0016] The third aspect of the present invention further provides a sound generating device, which includes a vibration system and a magnetic circuit system cooperating with the vibration system. The vibration system includes the diaphragm assembly described in the second aspect and a voice coil combined on one side of the diaphragm assembly.

[0017] For the vibrating plate used in the sound generating device of the present invention, the preparation raw materials include an aluminum alloy material and a heat dissipation enhancing filler mixed in the aluminum alloy material. The L value of the color difference on the outer surface of the vibrating plate is 30 to 80, and the emissivity of the vibrating plate at 100 °C is 0.5 to 0.98. Thus, while increasing the elastic modulus of the vibrating plate, the emissivity of the vibrating plate is large and the heat dissipation is fast, thereby improving the problems of low elastic modulus and poor heat dissipation effect existing in the existing vibrating plate. Description of the Drawings

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the heat dissipation enhancing filler in the embodiment of the present invention; wherein, A represents the heat dissipation enhancing filler.

[0020] Figure 2 Cross-sectional view of the diaphragm assembly in the present invention.

[0021] Figure 3 Cross-sectional view of the sound generating device in the present invention.

[0022] Figure 4 Comparison chart of the heat dissipation performance of the speakers formed by the vibrating plates in Example 1 and Comparative Example 1 of the present invention.

[0023] Explanation of reference numerals:

[0024] 100, sound generating device;

[0025] 10, housing; 20, diaphragm assembly; 21, vibrating plate; 22, surround; 30, voice coil; 40, magnetic circuit system. Specific embodiments

[0026] The following will describe the exemplary embodiments of the present invention in more detail with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0027] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless otherwise clearly specified in the context, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that alternative or additional steps may be used.

[0028] In the description of the embodiments of the present invention, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0029] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments of the present invention, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0031] In the description of the embodiments of the present invention, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of sheets" refers to more than two sheets (including two sheets).

[0032] The first aspect of the present invention provides a diaphragm for a sounding device. In combination with Figure 1 introduction, the raw materials for preparing the main body of the diaphragm include an aluminum alloy material and a heat dissipation enhancement filler mixed in the aluminum alloy material. The volume fraction of the heat dissipation enhancement filler in the raw materials for preparing the main body is 5% - 50%. The color difference L value of the outer surface of the diaphragm is 30 - 80, and the emissivity of the diaphragm at 100 °C is 0.5 - 0.98.

[0033] In the embodiments of the present invention, the surface emissivity of the aluminum alloy is improved by adding a heat dissipation enhancement filler to the aluminum alloy material, and the elastic modulus of the diaphragm is enhanced by the heat dissipation enhancement filler.

[0034] In an embodiment of the present invention, the volume fraction of the heat dissipation enhancing filler in the raw materials for preparing the main body is between 5% and 50%. It should be noted that when the volume fraction of the heat dissipation enhancing filler is less than 5%, on the one hand, the heat dissipation enhancing filler is scattered inside the aluminum alloy matrix and cannot effectively improve the heat dissipation effect of the aluminum alloy; on the other hand, the volume fraction of the heat dissipation enhancing filler is too small, resulting in poor enhancement effect. As the volume fraction of the heat dissipation enhancing filler increases, the heat dissipation enhancing filler serves as a nucleation core, and the aluminum alloy matrix nucleates near the heat dissipation enhancing filler, the grains are continuously refined, and the elastic modulus and strength are improved; however, when the volume fraction of the heat dissipation enhancing filler is higher than 50%, the compatibility between the heat dissipation enhancing filler particles and the aluminum alloy matrix becomes poor, there are more defects in the material, and microcracks and plastic deformation are likely to occur when the material is affected by the load, resulting in a decrease in the elastic modulus and strength.

[0035] In the embodiments of the present invention, the volume fraction of the heat dissipation enhancing filler provided in the raw materials for preparing the main body can be any value within the interval formed by any two values within the above range. For example, it can be 5% - 30%, or it can be 30% - 50%, and so on. Exemplarily, the volume fraction of the heat dissipation enhancing filler in the raw materials for preparing the main body in the embodiments of the present invention can also be one of 5%, 8%, 10%, 12%, 15%, 16%, 18%, 20%, 22%, 25%, 26%, 28%, 30%, 32%, 35%, 36%, 38%, 40%, 42%, 45%, 46%, 48%, 50% or any value that satisfies the above range.

[0036] In the present invention, the color difference L value represents the degree of light and dark of the color. The color difference L value ranges from 0 to 100, where 0 represents pure black and 100 represents pure white. The smaller the color difference L value, the darker the color. In the embodiments of the present invention, by adding the heat dissipation enhancing filler, the color difference L value on the surface of the vibrating plate reaches 30 - 80. The smaller the color difference L value, the higher the emissivity and the better the heat dissipation effect. When the color difference L value is less than 30, the amount of the heat dissipation enhancing filler to be added is too much; when the color difference L value is greater than 80, the color on the surface of the vibrating plate is lighter and the heat radiation effect is poor.

[0037] In the embodiments of the present invention, the color difference L value on the outer surface of the vibrating plate provided can be any value within the interval formed by any two values within the above range. For example, it can be 30 - 50, or it can be 50 - 80, and so on. Exemplarily, the color difference L value on the outer surface of the vibrating plate in the embodiments of the present invention can also be one of 30, 40, 50, 60, 70, 80 or any value that satisfies the above range.

[0038] In an embodiment of the present invention, the emissivity of the vibrating plate reaches 0.5 to 0.98 at 100 °C. When the emissivity of the vibrating plate is less than 0.5 at 100 °C, the heat dissipation effect is poor; when the emissivity of the vibrating plate is greater than 0.98 at 100 °C, the amount of heat dissipation enhancing filler to be added is excessive. Excessive amount of filler will cause the density of the vibrating plate to be too large and the continuity of the vibrating plate matrix to be poor, the elastic modulus to decrease, and it is easy to break.

[0039] The emissivity of the vibrating plate provided in the embodiment of the present invention at 100 °C can be a value within the range composed of any two values in the above range. For example, it can be 0.5 to 0.8, or it can be 0.8 to 0.98, and so on. Exemplarily, the emissivity of the vibrating plate in the embodiment of the present invention at 100 °C can also be one of 0.5, 0.6, 0.7, 0.8, 0.9, 0.98 or any value satisfying the above range value.

[0040] In an embodiment of the present invention, the color difference L value of the heat dissipation enhancing filler is between 0 and 10. Exemplarily, the color difference L value of the heat dissipation enhancing filler can be one of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or any value satisfying the above range value.

[0041] In an embodiment of the present invention, the emissivity of the heat dissipation enhancing filler at 100 °C is 0.9 to 1. Exemplarily, the emissivity of the heat dissipation enhancing filler at 100 °C can be one of 0.9, 0.92, 0.94, 0.95, 0.96, 0.98, 1 or any value satisfying the above range value.

[0042] To synchronously enhance the mechanical properties such as the elastic modulus of the aluminum alloy material, the higher the elastic modulus of the heat dissipation enhancing filler, the better the enhancement effect. However, the higher the elastic modulus, the more difficult it is to prepare the heat dissipation enhancing filler itself. In an embodiment of the present invention, the elastic modulus of the heat dissipation enhancing filler is between 200 GPa and 1500 GPa.

[0043] The elastic modulus of the heat dissipation enhancing filler provided in the embodiment of the present invention can be a value within the range composed of any two values in the above range. For example, it can be 200 GPa to 800 GPa, or it can be 800 GPa to 1500 GPa, and so on. Exemplarily, the elastic modulus of the heat dissipation enhancing filler provided by the present invention can also be one of 200 GPa, 300 GPa, 400 GPa, 500 GPa, 600 GPa, 700 GPa, 800 GPa, 900 GPa, 1000 GPa, 1100 GPa, 1200 GPa, 1300 GPa, 1400 GPa, 1500 GPa or any value satisfying the above range value.

[0044] In the present invention, the specific surface area of the heat dissipation enhancing filler is the total surface area of the filler per unit mass, representing the effective area of contact between the filler and the outside world. The larger the specific surface area, the more effective area participates in radiation, the greater the radiated energy, and the better the heat dissipation. On the other hand, the larger the specific surface area of the filler, the larger the contact area with the aluminum alloy matrix, and the better the heat conduction. However, the larger the specific surface area of the filler, the higher the production cost and the more difficult it is to disperse the filler evenly. Considering comprehensively, in the embodiments of the present invention, the specific surface area of the heat dissipation enhancing filler is between 10m 2 / g and 3000m 2 / g.

[0045] The specific surface area of the heat dissipation enhancing filler provided by the present invention can be any value within the range formed by any two values within the above range. For example, it can be 10m 2 / g to 1000m 2 / g, or it can be 1000m 2 / g to 3000m 2 / g, and so on. Exemplarily, the specific surface area of the heat dissipation enhancing filler provided by the present invention can also be 10m 2 / g, 20m 2 / g, 50m 2 / g, 60m 2 / g, 80m 2 / g, 100m 2 / g, 200m 2 / g, 300m 2 / g, 400m 2 / g, 500m 2 / g, 600m 2 / g, 700m 2 / g, 800m 2 / g, 900m 2 / g, 1000m 2 / g, 1200m 2 / g, 1500m 2 / g, 1800m 2 / g, 2000m 2 / g, 2200m 2 / g, 2500m 2 / g, 2800m 2 / g, 3000m 2 / g, or any value satisfying the above range.

[0046] In the embodiments of the present invention, the mesh number of the heat dissipation enhancing filler is between 800 mesh and 18000 mesh. When the mesh number of the heat dissipation enhancing filler is too large and the maximum particle size is too small, the filler is prone to agglomeration at this time and is difficult to disperse evenly, resulting in a poor strengthening effect on the vibrating plate. On the other hand, the smaller the particle size, the more difficult the material preparation and the higher the cost. The thickness of the vibrating plate is limited. When the mesh number of the heat dissipation enhancing filler is too small and the maximum particle size is too large, the filler cannot be evenly distributed in the vibrating plate at this time, and even penetrates the vibrating plate. During the stress process of the vibrating plate, stress concentration occurs at the particle edges, and it is prone to fracture.

[0047] In the embodiments of the present invention, the mesh number of the heat dissipation enhancing filler provided can be the value within the range composed of any two values in the above range. For example, it can be 800 mesh to 10000 mesh, or it can be 10000 mesh to 18000 mesh, and so on. Exemplarily, the mesh number of the heat dissipation enhancing filler provided by the present invention can also be one of 800 mesh, 900 mesh, 1000 mesh, 2000 mesh, 3000 mesh, 4000 mesh, 5000 mesh, 6000 mesh, 7000 mesh, 8000 mesh, 9000 mesh, 10000 mesh, 11000 mesh, 12000 mesh, 13000 mesh, 14000 mesh, 15000 mesh, 16000 mesh, 17000 mesh, 18000 mesh or any value that satisfies the above range value.

[0048] In the embodiments of the present invention, the heat dissipation enhancing filler includes at least one of black silicon carbide, graphene, carbon nanotubes, black silica, and boron carbide.

[0049] In some embodiments of the present invention, the heat dissipation enhancing filler is selected from black silicon carbide. Black silicon carbide is mainly made from quartz sand, petroleum coke, and high-quality silica stone through high-temperature smelting in an electric resistance furnace, and has advantages such as high strength and low price.

[0050] In the embodiments of the present invention, the shape of the heat dissipation enhancing filler includes one or more of sheet-like, fibrous, polyhedral, and spherical.

[0051] In some alternative embodiments of the present invention, sheet-like heat dissipation enhancing fillers are used. The sheet-like heat dissipation enhancing filler has a large aspect ratio, a large specific surface area, and a large heat dissipation area, which is beneficial to heat conduction and radiation heat dissipation.

[0052] In the embodiments of the present invention, the aluminum alloy material includes at least one of Al-Si series alloy, Al-Zn series alloy, Al-Cu series alloy, Al-Mn series alloy, Al-Mg series alloy, Al-Cr series alloy, and Al-Li series alloy.

[0053] In an embodiment of the present invention, the mechanical properties of the vibrating plate are affected by the wettability and interfacial bonding strength between the heat dissipation enhancing filler and the aluminum alloy material. When the interfacial bonding strength is too small, the strengthening effect is limited and the performance improvement is not obvious. In order to further improve the wettability and interfacial bonding strength between the heat dissipation enhancing filler and the aluminum alloy material, at least one of pre-oxidation treatment, metal plating treatment, acid treatment, alkali treatment, and silane coupling agent treatment is used to modify the heat dissipation enhancing filler in the present invention.

[0054] The pre-oxidation treatment refers to high-temperature baking of the heat dissipation enhancing filler to form an oxide layer on its surface. The oxide layer has good wettability when contacting the aluminum alloy material. The metal plating treatment refers to forming a metal plating on the surface of the heat dissipation enhancing material. The metal plating has good wettability with the aluminum alloy material, which can improve the wettability between the heat dissipation enhancing filler and the aluminum alloy material, thereby enhancing the interfacial bonding force between the heat dissipation enhancing filler and the aluminum alloy material. On the other hand, it is also beneficial to the uniform distribution of the heat dissipation enhancing filler. Acid treatment or alkali treatment can remove the contaminants on the surface of the heat dissipation enhancing filler, improve the wettability between the heat dissipation enhancing filler and the aluminum alloy material, and increase the bonding strength and uniformity. The silane coupling agent treatment refers to introducing active groups on the surface of the heat dissipation enhancing filler to improve the wettability and interfacial bonding force between the heat dissipation enhancing filler and the aluminum alloy material.

[0055] In order to further improve the surface emissivity of the vibrating plate in the present invention, the main body of the vibrating plate is treated by one of passivation, electrophoresis, and anodic oxidation to form a treatment layer on at least one of its surfaces.

[0056] In an embodiment of the present invention, the thickness of the treatment layer is between 0.5 μm and 5 μm. When the thickness of the treatment layer is greater than 5 μm, the elastic modulus of the entire vibrating plate decreases significantly; when the thickness of the treatment layer is less than 0.5 μm, the improvement of the emissivity of the vibrating plate is not obvious. Exemplarily, the thickness of the treatment layer can be one of 0.5 μm, 0.6 μm, 0.8 μm, 1.0 μm, 1.2 μm, 1.5 μm, 1.6 μm, 1.8 μm, 2.0 μm, 2.2 μm, 2.5 μm, 2.6 μm, 2.8 μm, 3.0 μm, 3.2 μm, 3.5 μm, 3.6 μm, 3.8 μm, 4.0 μm, 4.2 μm, 4.5 μm, 4.6 μm, 4.8 μm, 5 μm or any value satisfying the above range.

[0057] The treatment layer, as the surface layer, directly affects the heat dissipation effect of the vibrating plate. In some embodiments of the present invention, the emissivity of the treatment layer at 100 °C needs to satisfy 0.5 to 1. Exemplarily, the emissivity of the treatment layer at 100 °C can be one of 0.5, 0.6, 0.7, 0.8, 0.9, 1 or any value satisfying the above range.

[0058] The elastic modulus is the ability of a material to resist elastic deformation. The higher the elastic modulus, the stronger the ability to resist elastic deformation. During the high-frequency vibration of the vibrating plate, it is not easy to resonate, and the high-frequency cut-off frequency is higher. In the embodiments of the present invention, the addition of the heat dissipation enhancing filler realizes the improvement of the elastic modulus of the vibrating plate. And limited by the addition amount of the heat dissipation enhancing filler and the processing difficulty, the elastic modulus of the vibrating plate ≤ 130 GPa.

[0059] In the embodiments of the present invention, the elastic modulus of the vibrating plate is between 70 GPa and 130 GPa. Exemplarily, the elastic modulus of the vibrating plate can be one of 70 GPa, 75 GPa, 80 GPa, 85 GPa, 90 GPa, 95 GPa, 100 GPa, 105 GPa, 110 GPa, 115 GPa, 120 GPa, 125 GPa, 130 GPa or any value satisfying the above range.

[0060] In the embodiments of the present invention, when the size of the speaker is fixed, the space of the front and rear cavities of the speaker is fixed within a certain range. When the thickness of the vibrating plate is too large, the maximum amplitude that the speaker can reach during vibration becomes smaller and the loudness becomes lower. Therefore, the thickness of the vibrating plate should not be too large. And when the thickness of the vibrating plate is too small, the rigidity of the vibrating plate is poor, and it is easy to deform during vibration, generating splitting vibration, which affects the high-frequency response of the speaker. Therefore, in the present invention, the thickness of the vibrating plate is between 5 μm and 500 μm.

[0061] Exemplarily, the thickness of the vibrating plate in the present invention can be one of 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm or any value satisfying the above range.

[0062] The second aspect of the present invention provides a diaphragm assembly. Refer to Figure 2 As shown, the key of the diaphragm assembly 20 is that it includes a surround 22 and a vibrating plate 21 disposed at the center position of the surround 22. The vibrating plate 21 is the vibrating plate described in the first aspect. The surround 22 and the vibrating plate 21 are integrally injection molded or connected by adhesive bonding.

[0063] The third aspect of the present invention provides a sound generating device. Refer to Figure 3As shown, the sound generating device 100 can be a loudspeaker, which includes a housing 10, a vibration system disposed in the housing 10, and a magnetic circuit system 40 cooperating with the vibration system. The vibration system includes a diaphragm assembly 20 as described in the second aspect and a voice coil 30 coupled to one side of the diaphragm assembly 20. Among them, the diaphragm assembly 20 includes a surround 22 and a vibrating plate 21 disposed at the center of the surround 22. The vibrating plate 21 is connected to the center of the surround 22, and the top of the voice coil is connected to the center of the surround 22 or the top of the voice coil is connected to the vibrating plate 21.

[0064] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art to which the present invention pertains. The experimental reagents used in the following embodiments are all conventional biochemical reagents unless otherwise specified; the raw materials, instruments, and equipment used in the following embodiments can all be obtained through market purchase or by existing methods; the dosages of the experimental reagents are all the dosages of the reagents in conventional experimental operations unless otherwise specified; the experimental methods are all conventional methods unless otherwise specified. It should be further noted that the following description is only exemplary and not a specific limitation of the present invention.

[0065] Example 1

[0066] A vibrating plate for a sound generating device, with a thickness of 75 μm. The main body of the vibrating plate is prepared from 5052 aluminum alloy and black silicon carbide mixed therewith. Among them,

[0067] The mesh number of the black silicon carbide is 2000 mesh, the added volume fraction of the black silicon carbide is 30%, the elastic modulus of the black silicon carbide is 430 GPa, the specific surface area of the black silicon carbide is 30 m 2 / g, the color difference L value of the black silicon carbide is 3, the emissivity of the black silicon carbide at 100 °C is 0.99; the black silicon carbide is treated by Cu plating; the added volume fraction of the 5052 aluminum alloy is 70%.

[0068] Example 2

[0069] A vibrating plate for a sound generating device, which uses the same raw materials as the vibrating plate in Example 1. The difference is only that, after passivation treatment, a treatment layer is formed on both side surfaces of the vibrating plate in Example 2, the thickness of the treatment layer is 2 μm, and the emissivity of the treatment layer at 100 °C is 0.9.

[0070] Example 3

[0071] A vibrating plate for a sound generating device, with a thickness of 75 μm. The main body of the vibrating plate is prepared from 5052 aluminum alloy and black silicon carbide mixed therewith. Among them,

[0072] The mesh number of black silicon carbide is 2000 mesh, the added volume fraction of black silicon carbide is 30%, the elastic modulus of black silicon carbide is 430 GPa, the specific surface area of black silicon carbide is 30 m 2 / g, the color difference L value of black silicon carbide is 3, and the emissivity of black silicon carbide at 100 °C is 0.99; the added volume fraction of 5052 aluminum alloy is 70%.

[0073] Comparative Example 1

[0074] The diaphragm for the sound generating device is an existing 5052 aluminum alloy diaphragm without the addition of black silicon carbide, and the external dimensions of the diaphragm in Comparative Example 1 are the same as those of the diaphragm in Example 1.

[0075] Performance Test

[0076] The diaphragms in Example 1 and Comparative Example 1 were respectively assembled into speakers of the same model, and their heating curves and acoustic performances were tested.

[0077] Color difference: It was tested using a BYK handheld color difference meter. The illumination light source was D65, and the observation angle was 10°. Three values were tested and averaged.

[0078] Emissivity: It was tested using the single-temperature method. The diaphragm was fixed on a constant-temperature platform set at 100 °C. The emissivity of the Fluke infrared thermal imager was set to different values. The temperature values measured at different emissivities were subtracted from the surface temperature value of the material measured using a thermocouple. (For example, when the emissivity was set to 1, the temperature measured by the infrared thermal imager was 90, and the surface temperature of the material measured by the thermocouple was 98 °C, then the temperature difference was -8 °C.) The set emissivity and the temperature difference were linearly fitted, and the emissivity value when the temperature difference was 0 was taken as the emissivity of the material.

[0079] Table 1 Summary of Physical Property Indexes of the Diaphragms in the Example and the Comparative Example

[0080] Physical property indexes of the vibrating plate Example 1 Example 2 Example 3 Comparative example 1 Color difference L value 66.7 60.5 67.9 91.8 Emissivity at 100 °C 0.8 0.9 0.8 0.2 Elastic modulus / GPa 110 112 91 70

[0081] As can be seen from Table 1, Comparative Example 1 is a diaphragm made of aluminum alloy with high brightness, so the color difference L value is relatively large; compared with Comparative Example 1, 30% of black silicon carbide is added in Example 1, the brightness is reduced, and the color difference value is smaller.

[0082] The surface of the aluminum alloy diaphragm in Comparative Example 1 is bright, and the heat radiation effect is poor, and the emissivity at 100 °C is relatively small; in Example 1, due to the addition of black silicon carbide with high emissivity, its emissivity is significantly improved.

[0083] In Example 1, black silicon carbide with an elastic modulus of 430 GPa was added, which is much higher than the modulus of the aluminum alloy material. During the elastic deformation process, it can withstand a greater load. Therefore, the obtained vibrating plate has a relatively high elastic modulus of 110 GPa.

[0084] In Example 2, since the vibrating plate was passivated, a passivation film was formed, the brightness decreased, the L value decreased, and the emissivity was further improved. However, since the thickness of the passivation film accounted for a relatively small proportion, the influence on the elastic modulus of the vibrating plate was relatively small.

[0085] In Example 3, since the silicon carbide was not surface-treated, its compatibility with the aluminum alloy matrix of the vibrating plate was poor, and the strengthening effect was worse than that of Example 1.

[0086] Speaker heat dissipation performance: The temperature of the speaker voice coil was tested by Klipple software.

[0087] Combined Figure 4 As shown, when working at the rated power, starting from the starting working time, the temperature in Example 1 was lower than that in Comparative Example 1, and as the working time extended, the temperature difference between the two continuously increased and gradually stabilized at 70 s of operation, and the final temperature difference was about 4 °C. Among them, the temperature difference is the temperature in Example 1 - the temperature in Comparative Example 1.

[0088] It can be seen from this that Example 1 has a high emissivity and a good heat radiation effect. Therefore, the temperature rise of the speaker using the vibrating plate in Example 1 is small.

[0089] In the embodiments of the present invention, the L value of the color difference on the outer surface of the vibrating plate is 30 to 80, and the emissivity reaches 0.5 to 0.98 at 100 °C. The emissivity is large, the heat dissipation is fast, and under the same power and working time, the temperature rise is low.

[0090] In the embodiments of the present invention, the elastic modulus of the vibrating plate is between 70 GPa and 130 GPa. The elastic modulus is higher than that of the conventional aluminum alloy vibrating plate, and the high-frequency cut-off frequency of the speaker is high.

[0091] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A diaphragm for a sound generating device, characterized in that, The raw materials for preparing the main body of the vibrating plate include an aluminum alloy material and a heat dissipation enhancing filler mixed in the aluminum alloy material, and the volume fraction of the heat dissipation enhancing filler in the raw materials for preparing the main body is 5% to 50%. The L value of the color difference on the outer surface of the vibrating plate is 30 to 80, and the emissivity of the vibrating plate at 100 °C is 0.5 to 0.

98.

2. The diaphragm for a sound generating device according to claim 1, characterized in that, The specific surface area of the heat dissipation enhancing filler is between 10 m 2 / g and 3000 m 2 / g; and / or, The mesh number of the heat dissipation enhancing filler is between 800 mesh and 18000 mesh; and / or The L value of the color difference of the heat dissipation enhancing filler is between 0 and 10.

3. The diaphragm for a sound generating device according to claim 1, characterized in that, The emissivity of the heat dissipation enhancing filler at 100 °C is 0.9 to 1; and / or The elastic modulus of the heat dissipation enhancing filler is between 200 GPa and 1500 GPa.

4. The diaphragm for a sound generating device according to claim 1, wherein, The heat dissipation enhancing filler includes at least one of black silicon carbide, graphene, carbon nanotubes, black silicon dioxide, and boron carbide.

5. The diaphragm for a sound generating device according to claim 1, characterized in that, The shape of the heat dissipation enhancing filler includes one or more of sheet shape, fibrous shape, polyhedral shape, and spherical shape.

6. The diaphragm for a sound generating device according to claim 1, characterized in that, The heat dissipation enhancing filler is obtained through modification treatment. The modification treatment includes at least one of pre-oxidation treatment, metal plating treatment, acid treatment, alkali treatment, and silane coupling agent treatment.

7. The diaphragm for a sound generating device according to claim 1, characterized in that, The main body of the vibrating plate is formed with a treatment layer on at least one side surface thereof after being treated by one of passivation, electrophoresis, and anodic oxidation.

8. The diaphragm for a sound generating device according to claim 7, wherein, The thickness of the treatment layer is between 0.5 μm and 5 μm; and / or The emissivity of the treatment layer at 100 °C is 0.5 to 1.

9. The diaphragm for a sound generating device according to any one of claims 1 to 8, characterized in that, The elastic modulus of the vibrating plate is between 70 GPa and 130 GPa; and / or The thickness of the vibrating plate is between 5 μm and 500 μm.

10. A diaphragm assembly, characterized in that, It includes a surround and a vibrating plate disposed at the center position of the surround. The vibrating plate is the vibrating plate according to any one of claims 1 to 9. The surround and the vibrating plate are integrally injection-molded or connected by adhesive bonding.

11. A sound generating device, characterized in that, It includes a vibration system and a magnetic circuit system cooperating with the vibration system. The vibration system includes the diaphragm assembly according to claim 10 and a voice coil combined on one side of the diaphragm assembly.

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