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

Abstract

The utility model belongs to the technical field of electroacoustics, and particularly relates to a vibrating plate for a sound production device, a vibrating diaphragm assembly and a sound production device, the vibrating plate for the sound production device comprises a main body part, and the main body part is formed by mixing an aluminum alloy material and silicon carbide powder; the particle size D90 of the silicon carbide powder is between 0.1 mu m and 20 mu m, and the thickness of the main body part is between 5 mu m and 500 mu m. The vibration plate provided by the utility model has the advantages of high specific modulus, high yield strength and the like, thereby improving the high-frequency cut-off frequency of the sound production device.

Description

Technical Field

[0001] This utility model belongs to the field of electroacoustic technology, and specifically relates to a vibrating plate, diaphragm assembly and sound-generating device for a sound-generating device. Background Technology

[0002] As the industry demands higher high-frequency performance from loudspeakers, loudspeaker diaphragms require high elastic modulus, leading some loudspeakers to use aluminum alloy or titanium alloy diaphragms. However, titanium alloys typically have a close-packed hexagonal structure with tightly packed atoms, making them difficult to plastically deform and process into the desired shape. While alloying can improve mechanical properties such as yield strength, the elastic modulus of different aluminum alloys is similar, around 70 GPa. Therefore, when existing aluminum alloy materials cannot meet the requirements, there are no suitable alternatives.

[0003] Therefore, the vibrating plates used in existing sound-generating devices still need improvement. Utility Model Content

[0004] The purpose of this invention is to provide a vibrating plate, a diaphragm assembly, and a sound-generating device. The vibrating plate in this invention has advantages such as high specific modulus and high yield strength, thereby improving the high-frequency cutoff frequency of the sound-generating device.

[0005] The first aspect of this utility model provides a vibrating plate for a sound-generating device, the vibrating plate including a main body, the main body being formed by mixing aluminum alloy material and silicon carbide powder; wherein the particle size D90 of the silicon carbide powder is between 0.1μm and 20μm, and the thickness of the main body is between 5μm and 500μm.

[0006] In some embodiments of this utility model, at least one side surface of the main body of the vibration plate is integrally stamped with reinforcing ribs.

[0007] In some embodiments of this utility model, the yield strength of the main body is between 50 MPa and 500 MPa.

[0008] In some embodiments of this utility model, the density of the main body is between 2.5 g / cm³. 3 ~3g / cm 3 Between; and / or, the specific modulus of the main body is between 25 GPa / (g / cm³). 3 )~50GPa / (g / cm 3 )between.

[0009] In some embodiments of this invention, the silicon carbide powder is selected from 6H-type α-SiC.

[0010] In some embodiments of this utility model, the shape of the silicon carbide powder includes at least one of spherical, flake, and irregular polyhedral shapes.

[0011] In some embodiments of this utility model, the silicon carbide powder is obtained by at least one of pre-oxidation treatment, metal coating treatment, acid treatment, alkali treatment, and silane coupling agent treatment.

[0012] In some embodiments of this utility model, the aluminum alloy material includes one of the 1-series, 3-series, 5-series, 6-series, 7-series, and 8-series aluminum alloys; and / or, the aluminum alloy material contains additive elements, wherein the additive elements are any one of Mg, Si, Ti, Cu, Zr, and Y.

[0013] The second aspect of this utility model also provides a diaphragm assembly, which includes a folded ring and a vibrating plate disposed at the center of the folded ring. The vibrating plate is the vibrating plate described in the first aspect. The folded ring and the vibrating plate are integrally injection molded or bonded together by adhesive.

[0014] The third aspect of this utility model also provides a sound-generating device, which includes a vibration system and a magnetic circuit system cooperating with the vibration system, wherein the vibration system includes the diaphragm assembly described in the second aspect and a voice coil coupled to one side of the diaphragm assembly.

[0015] In this invention, the vibrating plate includes a main body, which is formed by mixing aluminum alloy material and silicon carbide powder. The particle size D90 of the silicon carbide powder is between 0.1μm and 20μm, and the thickness of the main body is between 5μm and 500μm. This enables the vibrating plate to have advantages such as high specific modulus and high yield strength, thereby improving the high-frequency cutoff frequency of the sound-generating device. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of silicon carbide powder in an embodiment of the present invention; wherein, A represents silicon carbide powder.

[0018] Figure 2 This is a cross-sectional view of the diaphragm assembly in an embodiment of the present invention.

[0019] Figure 3 This is a top view of the vibrating plate with reinforcing ribs in an embodiment of this utility model.

[0020] Figure 4 for Figure 3 Cross-sectional view along the AA direction.

[0021] Figure 5 This is a cross-sectional view of the sound-generating device in an embodiment of this utility model.

[0022] Figure 6 The tensile curves of the vibrating plate in the embodiments and comparative examples of this utility model are shown.

[0023] Figure 7 The FR curves of the loudspeaker formed by the vibrating plate in the embodiments and comparative examples of this utility model are shown.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100. Sound-generating device;

[0026] 10. Housing; 20. Diaphragm assembly; 21. Vibrating plate; 22. Surround; 23. Reinforcing rib; 30. Voice coil; 40. Magnetic circuit system. Detailed Implementation

[0027] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0028] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude 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 construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0029] In the description of the embodiments of this utility model, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly defined.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In the description of this utility model embodiment, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0032] In the description of the embodiments of this utility model, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0033] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0034] The first aspect of this utility model provides a vibrating plate for a sound-generating device, combined with Figure 1 The vibrating plate is described as including a main body, which is formed by mixing aluminum alloy material and silicon carbide powder; wherein the particle size D90 of silicon carbide powder is between 0.1μm and 20μm, and the thickness of the main body is between 5μm and 500μm.

[0035] In the embodiments of this invention, silicon carbide possesses a high melting point, high hardness, and high elastic modulus, and can form a good interfacial bond with aluminum alloy materials. Furthermore, silicon carbide is easy to prepare and inexpensive. The vibrating plate in this invention combines the advantages of aluminum alloy and silicon carbide, exhibiting excellent mechanical and physical properties such as high strength, high modulus, and low density. The addition of silicon carbide powder acts as a crystallization nucleus, which is beneficial for the nucleation of the aluminum alloy matrix. Therefore, the aluminum alloy grains are smaller, resulting in higher strength and modulus. On the other hand, the different coefficients of thermal expansion between silicon carbide and the aluminum alloy matrix increase dislocation density during processing, leading to dislocation entanglement and difficulty in deformation, thus resulting in higher strength and elastic modulus.

[0036] The particle size D90 of the silicon carbide powder provided by this invention refers to the powder diameter when the cumulative volume distribution is 90%, meaning that 90% of the particles have a diameter smaller than this value. In the embodiments of this invention, the particle size D90 of the silicon carbide powder is between 0.1 μm and 20 μm. Silicon carbide acts as a nucleation core; the larger the size, the larger the grain size. The yield strength of the reinforced aluminum alloy decreases with increasing silicon carbide powder size, therefore the diameter should not be too large. Conversely, if the silicon carbide powder diameter is too small, the fine particles are prone to agglomeration, resulting in poor reinforcement. Furthermore, dislocations can bypass the powder's movement, thus offering no significant improvement in the material's strength.

[0037] The particle size D90 of the silicon carbide powder provided by this invention can be any value within the range of any two values ​​mentioned above, such as 1μm to 10μm, or 10μm to 20μm, and so on. For example, the particle size D90 of the silicon carbide powder can also be one of 0.1μm, 0.2μm, 0.5μm, 0.8μm, 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, and 20μm, or any value satisfying the above range.

[0038] When the size of the loudspeaker is fixed, the space between the front and rear cavities is also fixed within a certain range. If the thickness of the diaphragm is too large, the maximum amplitude that the loudspeaker can achieve during vibration will decrease, resulting in lower loudness. Therefore, the thickness of the diaphragm should not be too large. If the thickness of the diaphragm is too small, the rigidity of the diaphragm is poor, and it is prone to deformation during vibration, producing segmented vibration, which affects the high-frequency response of the loudspeaker. In the embodiments of this utility model, the thickness of the main body of the diaphragm is between 5μm and 500μm.

[0039] The thickness of the main body of the vibrating plate provided by this utility model can be any value within the range of any two values ​​mentioned above, such as 5μm to 50μm, 50μm to 200μm, 200μm to 500μm, and so on. For example, the thickness of the main body of the vibrating plate can also be one of 5μm, 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 150μm, 200μm, 250μm, 300μm, 350μm, 400μm, 450μm, and 500μm, or any value satisfying the above range.

[0040] In embodiments of this invention, the silicon carbide powder includes one of α-SiC and β-SiC. For example, the silicon carbide powder may be selected from 6H-type α-SiC.

[0041] In embodiments of this invention, the shape of the silicon carbide powder includes at least one of spherical, flake, and irregular polyhedral shapes. For example, the shape of silicon carbide can be spherical, flake, or irregular polyhedral.

[0042] In some embodiments of this utility model, spherical silicon carbide powder is used. The spherical shape makes it easy to disperse in the aluminum alloy matrix, improving the material uniformity. During deformation processes such as stretching, stress concentration is less likely to occur, and the stress distribution is uniform, thereby avoiding the generation of cracks.

[0043] In the embodiments of this invention, the higher the volume fraction of silicon carbide powder, the higher the dislocation density and the higher the strength of the material; however, the higher the volume fraction of silicon carbide powder, the higher the material density. Therefore, the volume fraction of silicon carbide powder in the raw materials for preparing the main body is 1% to 50%, thereby achieving a vibrating plate with a high elastic modulus and a low density.

[0044] The volume fraction of the silicon carbide powder provided by this invention can be any value within the range of any two values ​​mentioned above, such as 1% to 5%, 5% to 30%, 30% to 50%, and so on. Exemplarily, the volume fraction of the silicon carbide powder can also be one of 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or 50%, or any value satisfying the above range.

[0045] The mechanical properties of composite materials are affected by the wettability and interfacial bonding strength between the reinforcing particles and the aluminum alloy matrix. Insufficient interfacial bonding strength results in limited strengthening effect and minimal performance improvement. To further improve the bonding strength and uniformity between silicon carbide powder and aluminum alloy materials, in this embodiment of the invention, the silicon carbide powder undergoes at least one of the following modification treatments: pre-oxidation treatment, metal coating treatment, acid treatment, alkali treatment, and silane coupling agent treatment. Pre-oxidation treatment involves high-temperature baking of the silicon carbide powder to form a SiO2 layer on its surface. SiO2 has good wettability with the aluminum alloy matrix and prevents direct contact between silicon carbide and the aluminum alloy matrix, thus avoiding the formation of Al4C3. Al4C3 is brittle and prone to water absorption and hydrolysis. Metal coating treatment involves forming a metal coating on the surface of the silicon carbide powder. The metal coating has good wettability with the aluminum alloy matrix, improving the wettability between the silicon carbide powder and the aluminum alloy matrix, thereby enhancing the interfacial bonding force between silicon carbide and the matrix. Furthermore, it promotes the uniform distribution of the silicon carbide powder. Acid or alkali treatment can remove contaminants from the surface of silicon carbide powder, improve the wettability between the silicon carbide powder and the aluminum alloy matrix, and enhance the bonding strength and uniformity. Silane coupling agent treatment introduces active groups onto the surface of the silicon carbide powder to improve the bonding strength and uniformity between the silicon carbide powder and the aluminum alloy matrix. In the embodiments of this invention, the aluminum alloy material includes one of the 1-series, 3-series, 5-series, 6-series, 7-series, and 8-series aluminum alloys, which are easily plastically processed to achieve the required thickness and shape for the vibrating plate.

[0046] In embodiments of this utility model, to further improve the wettability between the aluminum alloy material, or aluminum alloy matrix, and the silicon carbide powder, the aluminum alloy material also contains additive elements, wherein the additive elements can be at least one of elements such as Mg, Si, Ti, Cu, Zr, and Y.

[0047] Based on the quality of the aluminum alloy material, the amount of additive elements provided by this invention accounts for 0.1wt% to 10wt% of the aluminum alloy material.

[0048] For example, the mass percentage of Mg added can be any value within the range of any two values ​​mentioned above, such as 0.1wt% to 5wt%, or 5wt% to 10wt%, and so on. The mass percentage of Mg added can also be one of 0.1wt%, 0.2wt%, 0.5wt%, 0.6wt%, 0.8wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, or 10wt%, or any value satisfying the above range.

[0049] For example, the mass percentage of Si added can be any value within the range of any two values ​​mentioned above, such as 0.1wt% to 5wt%, or 5wt% to 10wt%, and so on. The mass percentage of Si added can also be one of 0.1wt%, 0.2wt%, 0.5wt%, 0.6wt%, 0.8wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, or any value that satisfies the above range.

[0050] For example, the mass percentage of Ti added can be any value within the range of any two values ​​mentioned above, such as 0.1wt% to 5wt%, or 5wt% to 10wt%, and so on. The mass percentage of Ti added can also be one of 0.1wt%, 0.2wt%, 0.5wt%, 0.6wt%, 0.8wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, or any value that satisfies the above range.

[0051] For example, the mass percentage of Cu added can be any value within the range of any two values ​​mentioned above, such as 0.1wt% to 5wt%, or 5wt% to 10wt%, and so on. The mass percentage of Cu added can also be one of 0.1wt%, 0.2wt%, 0.5wt%, 0.6wt%, 0.8wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, or any value that satisfies the above range.

[0052] For example, the percentage of Zr added can be any value within the range of any two values ​​mentioned above, such as 0.1wt% to 5wt%, or 5wt% to 10wt%, and so on. The percentage of Zr added can also be any one of 0.1wt%, 0.2wt%, 0.5wt%, 0.6wt%, 0.8wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, or 10wt%, or any value satisfying the range mentioned above.

[0053] For example, the percentage of Y added can be any value within the range of any two values ​​mentioned above, such as 0.1wt% to 5wt%, or 5wt% to 10wt%, and so on. The percentage of Y added can also be any one of 0.1wt%, 0.2wt%, 0.5wt%, 0.6wt%, 0.8wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, or 10wt%, or any value satisfying the range mentioned above.

[0054] The specific modulus of a diaphragm is the ratio of its elastic modulus to its density. The high-frequency response of a loudspeaker is directly proportional to its specific modulus; the higher the specific modulus, the higher the cutoff frequency. Therefore, the specific modulus of the diaphragm must meet the requirement of ≥25 GPa / (g / cm³). 3 A higher specific modulus requires a higher elastic modulus and a larger volume fraction of silicon carbide powder. However, an increase in the volume fraction of silicon carbide powder leads to an increase in density. Therefore, considering the actual properties of the material, the specific modulus of the vibrating plate must be ≤50 GPa / (g / cm³). 3 ).

[0055] In an embodiment of this invention, the specific modulus of the main body of the vibrating plate is between 25 GPa / (g / cm²). 3 )~50GPa / (g / cm 3 Between ) . For example, the specific modulus of the vibrating plate can be 25 GPa / (g / cm). 3 ), 26 GPa / (g / cm) 3 ), 27 GPa / (g / cm) 3 ), 28 GPa / (g / cm) 3 ), 29 GPa / (g / cm) 3 ), 30 GPa / (g / cm 3 ), 31 GPa / (g / cm) 3 ), 32 GPa / (g / cm) 3 ), 33 GPa / (g / cm) 3 ), 34 GPa / (g / cm) 3 ), 35 GPa / (g / cm) 3 ), 36 GPa / (g / cm) 3 ), 37 GPa / (g / cm) 3 ), 38 GPa / (g / cm 3 ), 39 GPa / (g / cm) 3 ), 40 GPa / (g / cm 3 ), 41 GPa / (g / cm 3 ), 42 GPa / (g / cm 3), 43 GPa / (g / cm) 3 ), 44 GPa / (g / cm 3 ), 45 GPa / (g / cm 3 ), 46 GPa / (g / cm 3 ), 47 GPa / (g / cm) 3 ), 48 GPa / (g / cm) 3 ), 49 GPa / (g / cm) 3 ), 50 GPa / (g / cm) 3 One of the values ​​in the above range or any value that satisfies the above range.

[0056] The weight of the vibration system affects the mid-frequency sensitivity of the loudspeaker; the greater the weight, the lower the sensitivity. When the voice coil weight is fixed, the weight of the diaphragm accounts for the majority of the overall weight. A higher density diaphragm results in a greater weight for the same thickness and dimensions; therefore, the density of the diaphragm cannot be too high. The density of pure aluminum alloy is 2.7 g / cm³. 3 To reduce density, light metals such as Mg and Li need to be added. However, the amount of metal that can be added to aluminum alloys is limited. On the other hand, excessive metal will reduce the strength and other mechanical properties of aluminum alloys. Therefore, considering all aspects of the embodiments of this utility model, the density of the main body of the vibrating plate is between 2.5 g / cm³. 3 ~3g / cm 3 Between. For example, the density of the vibrating plate can be 2.5 g / cm³. 3 2.6g / cm 3 2.7g / cm 3 2.8g / cm 3 2.9g / cm 3 3g / cm 3 One of the above values ​​or any value that satisfies the above range.

[0057] In embodiments of this invention, the yield strength of the main body of the vibrating plate is between 50 MPa and 500 MPa. Yield strength is the material's ability to resist micro-plastic deformation. When a material is subjected to stress greater than its yield strength, the part undergoes permanent deformation. The higher the yield strength, the stronger the material's resistance to deformation. Therefore, the yield strength of the vibrating plate must be ≥50 MPa. However, the higher the yield strength, the more difficult it is to perform plastic deformation. If the yield strength is too high, the material is difficult to process into the required thickness and shape of the vibrating plate.

[0058] The yield strength of the vibrating plate body provided by this utility model can be any value within the range of any two values ​​mentioned above, such as 50MPa to 100MPa, 100MPa to 400MPa, 400MPa to 500MPa, and so on. For example, the yield strength of the vibrating plate body can also be one of 50MPa, 60MPa, 70MPa, 80MPa, 90MPa, 100MPa, 150MPa, 200MPa, 250MPa, 300MPa, 350MPa, 400MPa, 450MPa, and 500MPa, or any value satisfying the above range.

[0059] In the embodiments of this utility model, the vibrating plate is formed by stamping aluminum foil material. The stamping is carried out by cold stamping or heated stamping, and the temperature of heated stamping is between 50°C and 300°C. The aluminum foil material is made by powder metallurgy and rolling of aluminum alloy material mixed with silicon carbide powder.

[0060] In some embodiments of this invention, a foil is formed by powder metallurgy after the raw material is prepared and then subjected to multiple hot rolling, annealing, cold rolling, and post-treatment processes. The foil is then stamped into shape. Powder metallurgy allows silicon carbide powder to be uniformly distributed in the aluminum alloy matrix, avoiding compositional segregation; it allows for precise control of the volume fraction of silicon carbide powder; and the sintering temperature is below the liquidus line, preventing the alloy from completely melting and reducing the possibility of interfacial reactions with silicon carbide.

[0061] In some embodiments of this invention, because silicon carbide-reinforced aluminum alloys have high strength, they are prone to cracking during room temperature stamping. Heating and warm stamping improves the material's plasticity, making it less prone to cracking. The temperature for warm stamping can be any value within the range defined by any two values ​​mentioned above, such as 50℃~180℃, 180℃~300℃, and so on. For example, the temperature for warm stamping can be one of 50℃, 60℃, 70℃, 80℃, 90℃, 100℃, 150℃, 180℃, 200℃, 250℃, 280℃, and 300℃, or any value satisfying the above range.

[0062] In an embodiment of this utility model, to further enhance the rigidity of the vibrating plate, reinforcing ribs are formed on at least one surface of the main body of the vibrating plate, see [link to relevant documentation]. Figure 3 and Figure 4 As shown, for example, the reinforcing rib 23 can be integrally stamped with the main body.

[0063] A second aspect of this utility model provides a diaphragm assembly, see [link to relevant documentation] Figure 2As shown, the key feature of the diaphragm assembly 20 is that it includes a folded ring 22 and a vibrating plate 21 disposed at the center of the folded ring. The vibrating plate 21 is the vibrating plate described in the first aspect. The folded ring 22 and the vibrating plate 21 are integrally injection molded or bonded together by adhesive.

[0064] The third aspect of this utility model provides a sound-generating device, see [link to relevant documentation]. Figure 5 As 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. The diaphragm assembly 20 includes a surround 22 and a diaphragm plate 21 disposed at the center of the surround 22. The diaphragm 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 diaphragm plate 21.

[0065] Unless otherwise defined, the technical terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art to which this utility model pertains. Unless otherwise specified, the experimental reagents used in the following embodiments are all conventional biochemical reagents; the raw materials, instruments, and equipment used in the following embodiments can all be obtained through commercial purchase or by existing methods; unless otherwise specified, the amounts of experimental reagents used are the amounts used in conventional experimental operations; unless otherwise specified, the experimental methods are all conventional methods.

[0066] Example 1

[0067] The vibrating plate used in the sound-generating device has a thickness of 75 μm. It is formed by mixing 3003 aluminum alloy and silicon carbide powder. The silicon carbide powder has a 6H-type α-SiC crystal form and a particle size D90 of 5 μm. The silicon carbide powder has undergone pre-oxidation treatment.

[0068] Example 2

[0069] In Example 2, the external dimensions of the vibrating plate are the same as those in Example 1. The only difference between Example 2 and Example 1 is that the silicon carbide powder is not pre-oxidized.

[0070] Example 3

[0071] In Example 3, the external dimensions of the vibrating plate are the same as those in Example 1. The only difference between Example 3 and Example 1 is that the vibrating plate has reinforcing ribs integrally stamped on one side surface.

[0072] Comparative Example 1

[0073] In Comparative Example 1, the vibrating plate is an existing 3003-H18 aluminum alloy vibrating plate, and the external dimensions of the vibrating plate in Comparative Example 1 are the same as those of the vibrating plate in Example 1.

[0074] Comparative Example 2

[0075] The external dimensions and preparation process of the vibrating plate in Comparative Example 2 are the same as those in Example 1. The only difference between Comparative Example 2 and Example 1 is that the crystal form of the silicon carbide powder is 3C type β-SiC.

[0076] Performance testing

[0077] Tensile properties: Tested using an INSTRON universal testing machine at a speed of 40 mm / min, a gauge length of 100 mm, and a specimen width of 15 mm. The yield strength was determined by the tensile stress corresponding to a strain of 0.2%.

[0078] Specific modulus: Specific modulus = elastic modulus / density.

[0079] Acoustic performance: The diaphragms in the examples and comparative examples were assembled into loudspeakers using acrylic pressure-sensitive adhesive and the same polyester elastomer diaphragms, and the frequency response curves of the loudspeakers were tested.

[0080] Table 1 Summary of the performance of the vibrating plate in the embodiments and comparative examples.

[0081] Vibrating plate physical properties Comparative Example 1 Comparative Example 2 Example 1 Example 2 Example 3 <![CDATA[Specific modulus / GPa / (g / cm 3 )]]> 25.6 33.8 35.7 34.8 35.8 Yield strength / MPa 76 108 120 116 135

[0082] Combined with Table 1 and Figure 6 The tensile curves show that the tensile stress of the vibrating plate in Example 1 is greater than that in the comparative example under different strains, indicating stronger resistance to deformation. This is because 30% silicon carbide powder was added in Example 1. Silicon carbide has high strength and strong resistance to deformation during the tensile process, resulting in greater stress under the same deformation.

[0083] In Example 1, due to the addition of silicon carbide, the density of silicon carbide is approximately 3.2 g / cm³. 3 The density of silicon carbide is slightly higher than that of aluminum alloy, therefore the density of the vibrating plate in Example 1 is slightly higher than that in the comparative example. However, due to the addition of silicon carbide powder, it can act as a nucleation site for aluminum alloy crystals, which is beneficial to the nucleation of the aluminum alloy matrix. Therefore, the grains in Example 1 are smaller. On the other hand, the thermal expansion coefficients of silicon carbide and aluminum alloy matrix are different, which increases the dislocation density during processing, causing dislocation entanglement and making deformation difficult. Therefore, the vibrating plate in Example 1 has a higher modulus, and the modulus-density ratio is significantly greater than that in Comparative Example 1.

[0084] Comparative Example 2 uses 3C-type β-silicon carbide, which has poorer stability and hardness than the 6H-type α-silicon carbide in Example 1. Therefore, the improvement in yield strength and other properties in Comparative Example 2 is not as significant as in Example 1. On the other hand, the silicon carbide used in the examples is cheaper.

[0085] Combination Figure 7As can be seen, in Example 1, due to its slightly higher density, the mid-frequency response is slightly lower than that of Comparative Example 1. However, in Example 1, the modulus-density ratio is higher, and the high-frequency cutoff frequency is significantly higher than that of Comparative Example 1, approximately 11.8 kHz, while the high-frequency cutoff frequency of Comparative Example 1 is approximately 8.75 kHz. The speaker assembled from the diaphragm in the examples can reproduce sound at higher frequencies.

[0086] In this invention, the main body of the vibrating plate is formed by mixing aluminum alloy material and silicon carbide powder. The particle size D90 of the silicon carbide powder is between 0.1μm and 20μm, and the thickness of the main body is between 5μm and 500μm. This results in a vibrating plate with high specific modulus and high yield strength, thereby increasing the high-frequency cutoff frequency of the sound-generating device and improving the sound-generating effect of the device.

[0087] The vibrating plate of this invention has a high specific modulus, therefore the loudspeaker using the vibrating plate of this invention has a higher high-frequency cutoff frequency.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A diaphragm for a sound producing device, characterized by, The vibrating plate comprises a main body part formed by mixing an aluminum alloy material and silicon carbide powder; The particle size D90 of the silicon carbide powder is between 0.1 μm and 20 μm, and the thickness of the main body part is between 5 μm and 500 μm.

2. The diaphragm for a sound production device according to claim 1, wherein At least one side surface of the main body part of the vibrating plate is integrally formed with a reinforcing rib.

3. The diaphragm for a sound production device according to claim 1, wherein The yield strength of the main body part is between 50 MPa and 500 MPa.

4. The diaphragm for a sound production device according to claim 1, wherein the density of the main body portion is between 2.5 g / cm 3 ~ 3 g / cm 3 ; and / or, The specific modulus of the main body portion is between 25 GPa / (g / cm 3 ) and 50 GPa / (g / cm 3 ).

5. The diaphragm for a sound production device according to claim 1, wherein The silicon carbide powder is selected from 6H type α-SiC.

6. The diaphragm for a sound production device according to claim 1, wherein The shape of the silicon carbide powder comprises at least one of a spherical shape, a flaky shape, and an irregular polyhedral shape.

7. The diaphragm for a sound production device according to claim 1, wherein The silicon carbide powder is obtained by at least one of pre-oxidation treatment, metal plating treatment, acid treatment, alkali treatment, and silane coupling agent treatment.

8. The diaphragm for a sound production device according to claim 1, wherein The aluminum alloy material comprises one of 1 series, 3 series, 5 series, 6 series, 7 series, and 8 series aluminum alloys; and / or The aluminum alloy material comprises an additive element, and the additive element is any one of Mg, Si, Ti, Cu, Zr, and Y elements.

9. A diaphragm assembly, characterized by, The vibrating plate is integrally formed with the folding ring by injection molding or is connected by an adhesive. The vibrating system comprises the diaphragm assembly of claim 9 and a voice coil combined on one side of the diaphragm assembly.

10. A sound producing device, characterized by ​

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