Dome, diaphragm assembly, sound generating device and electronic device

Abstract

The present application discloses a dome, a diaphragm assembly, a sound-generating device, and an electronic device, wherein the dome includes two reinforcement layers and a damping layer disposed between the two reinforcement layers, wherein the bonding interface between the reinforcement layer and the damping layer has a first chemical bond formed between the coupling agent and the reinforcement layer and a second chemical bond formed between the coupling agent and the damping layer, and the damping layer and the reinforcement layer are connected by the first chemical bond, the coupling agent, and the second chemical bond. The present application arranges a damping layer between the two reinforcement layers, and arranges a coupling agent at the bonding interface between the reinforcement layer and the damping layer, so that the reinforcement layer and the damping layer can be connected by the first chemical bond, the coupling agent, and the second chemical bond, thereby making the reinforcement layer and the damping layer more closely connected, avoiding the delamination of the dome due to high temperature or high frequency, and improving the sound effect of the sound-generating device.

Description

Technical Field

[0001] The present application relates to the field of electroacoustic technology, and more specifically, to a dome, a diaphragm assembly, a sound-generating device and an electronic device. Background Art

[0002] Existing domes are mostly made of carbon fiber material. The dome has the characteristics of heavy weight, sufficient rigidity, and unidirectional fiber anisotropy. However, the dome made of carbon fiber material has poor damping performance and is prone to separate vibration during high-frequency vibration, thereby affecting the sound effect of the speaker.

[0003] In the related art, in order to enhance the damping performance of the dome, a damping layer is added between the reinforcement layers of the dome. However, the reinforcement layer and the damping layer of this structure are bonded together by intermolecular forces, and there is an obvious interface, which leads to low damping of the dome, poor adhesion, poor vibration consistency, and easy delamination at high temperature and during high-frequency vibration.

[0004] Therefore, a new technical solution is needed to solve the above problems. Summary of the invention

[0005] One object of the present application is to provide a dome, wherein the reinforcing layer and the damping layer of the dome have greater adhesion and have higher rigidity and damping performance.

[0006] Another object of the present application is to provide a diaphragm assembly.

[0007] Another object of the present application is to provide a sound-generating device.

[0008] Another object of the present application is to provide an electronic device.

[0009] In order to achieve the above objectives, this application provides the following technical solutions.

[0010] The dome according to the embodiment of the first aspect of the present application includes two reinforcement layers and a damping layer arranged between the two reinforcement layers, wherein the bonding interface between the reinforcement layer and the damping layer has a first chemical bond formed between the coupling agent and the reinforcement layer and a second chemical bond formed between the coupling agent and the damping layer, and the damping layer and the reinforcement layer are connected by the first chemical bond, the coupling agent and the second chemical bond.

[0011] According to some embodiments of the present application, at least one of the reinforcement layer and the damping layer contains the coupling agent.

[0012] According to some embodiments of the present application, the reinforcing layer or the damping layer contains the coupling agent, and the coupling agent accounts for 0.2%-5% of the total weight of the reinforcing layer or the damping layer.

[0013] According to some embodiments of the present application, a coating layer is provided between the reinforcing layer and the damping layer, and the coating layer contains the coupling agent.

[0014] According to some embodiments of the present application, the thickness of the coating is 2 nm-5 μm.

[0015] According to some embodiments of the present application, the damping layer is rubber or a thermoplastic elastomer, and the reinforcing layer is a carbon fiber resin-based prepreg.

[0016] According to some embodiments of the present application, the rubber is one or more selected from acrylic rubber, polyurethane rubber, fluororubber, natural rubber, butyl rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, and silicone rubber.

[0017] According to some embodiments of the present application, the thermoplastic elastomer includes at least one of a polyurethane elastomer, a polyester elastomer, a styrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, and a polyamide-based thermoplastic elastomer.

[0018] According to some embodiments of the present application, the resin is one or more selected from epoxy resin, phenolic resin, cyanate resin, and bismaleimide.

[0019] According to some embodiments of the present application, the coupling agent is one or more selected from an organic silicon coupling agent, an organic chromium coupling agent, a titanate coupling agent, a phosphate ester, and an aluminate coupling agent.

[0020] According to some embodiments of the present application, the total thickness of the dome is 50 μm-300 μm, and the thickness of the damping layer is 1 / 6-1 / 2 of the total thickness of the dome.

[0021] According to some embodiments of the present application, the loss factor of the dome is 0.01-0.15, and the elastic modulus of the dome is 15 Gpa-80 Gpa.

[0022] According to some embodiments of the present application, the loss factor of the damping layer is 0.05-0.35, and the elastic modulus is greater than 30 MPa.

[0023] According to some embodiments of the present application, the dome is formed into a multi-layer structure in which the reinforcement layer and the damping layer are alternately stacked and distributed, and both surface layers of the dome are the reinforcement layers.

[0024] According to the diaphragm assembly of the second aspect of the present application, the diaphragm and the dome, the dome is the dome according to the above embodiment of the present application, and the dome is bonded to the diaphragm.

[0025] According to the third aspect of the embodiment of the present application, the sound-emitting device includes a vibration system and a magnetic circuit system coordinated with the vibration system, the vibration system includes a diaphragm assembly and a voice coil coupled to one side of the diaphragm assembly, the magnetic circuit system drives the voice coil to vibrate to drive the diaphragm assembly to produce sound, and the diaphragm assembly is the diaphragm assembly according to the above-mentioned embodiment of the present application.

[0026] An electronic device according to an embodiment of the fourth aspect of the present application includes the sound-emitting device of the above embodiment.

[0027] According to the dome of the sound-generating device of the embodiment of the present application, a damping layer is arranged between two reinforcement layers, a coupling agent is arranged at the bonding interface between the reinforcement layer and the damping layer, and a first chemical bond is formed between the coupling agent and the reinforcement layer, and a second chemical bond is formed between the coupling agent and the damping layer, so that the reinforcement layer and the damping layer can be connected through the first chemical bond, the coupling agent and the second chemical bond, thereby effectively improving the adhesion between the reinforcement layer and the damping layer, so that the reinforcement layer and the damping layer can be more closely connected, and the dome is prevented from being delaminated under high temperature or high frequency conditions. In addition, the dome can better demonstrate rigidity and damping performance when vibrating at high frequencies, making the frequency response curve smoother, thereby improving the sound effect of the sound-generating device.

[0028] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0030] Figure 1 is a schematic structural diagram of a dome according to an embodiment of the present application;

[0031] Figure 2 is a schematic structural diagram of a dome according to another embodiment of the present application;

[0032] Figure 3 is a schematic structural diagram of a dome according to another embodiment of the present application;

[0033] Figure 4 is a schematic structural diagram of a dome according to another embodiment of the present application;

[0034] Figure 5 is a schematic structural diagram of a sound-generating device according to an embodiment of the present application;

[0035] Figure 6 is a schematic diagram of a partial structure of a sound-generating device according to an embodiment of the present application;

[0036] Figure 7 It is a test curve diagram of Example 1 and Comparative Example 1.

[0037] Reference numerals

[0038] Sound generating device 1000;

[0039] Ball top 100; folding ring 200;

[0040] Reinforcement layer 10 ; Damping layer 20 ; Coating layer 30 . DETAILED DESCRIPTION

[0041] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0042] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0043] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0044] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0045] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0046] The dome 100 according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0047] like Figures 1 to 4 As shown, the dome 100 according to an embodiment of the present application includes two reinforcement layers 10 and a damping layer 20 arranged between the two reinforcement layers 10, wherein the bonding interface between the reinforcement layer 10 and the damping layer 20 has a first chemical bond formed between the coupling agent and the reinforcement layer 10 and a second chemical bond formed between the coupling agent and the damping layer 20, and the damping layer 20 and the reinforcement layer 10 are connected by the first chemical bond, the coupling agent and the second chemical bond.

[0048] In other words, the dome 100 according to the embodiment of the present application may be composed of two reinforcement layers 10 and a damping layer 20 arranged between the two reinforcement layers 10, the bonding interface between the reinforcement layer 10 and the damping layer 20 refers to the surface where the reinforcement layer 10 and the damping layer 20 are in contact with each other when stacked, and a coupling agent is arranged at the bonding interface between the reinforcement layer 10 and the damping layer 20, which may be arranged in the reinforcement layer 10, in the damping layer 20, or in both.

[0049] It should be noted that the first chemical bond is formed between the coupling agent and the reinforcement layer 10, which may be formed by a reaction between an independent coupling agent layer and the reinforcement layer 10, or by a reaction between the coupling agent in the damping layer 20 and the reinforcement layer 10, or by a reaction between the coupling agent contained in the reinforcement layer 10 and the reinforcement layer 10. Correspondingly, the second chemical bond is formed between the coupling agent and the damping layer 20, which may be formed by a reaction between an independent coupling agent layer and the damping layer 20, or by a reaction between the coupling agent in the reinforcement layer 10 and the damping layer 20, or by a reaction between the coupling agent contained in the damping layer 10 and the damping layer 10.

[0050] That is to say, a bonding interface is formed between the reinforcement layer 10 and the damping layer 20, and the coupling agent contained in the bonding interface forms a first chemical bond with the reinforcement layer 10 and a second chemical bond with the damping layer 20, so that the reinforcement layer 10 and the damping layer 20 are solidified and connected through the first chemical bond, the coupling agent and the second chemical bond. A bonding interface is formed between the reinforcement layer 10 and the damping layer 20, and the bonding interface can transfer stress, thereby enhancing the bonding strength between the reinforcement layer 10 and the damping layer 20, and improving the mechanical properties and acoustic properties of the dome 100. At the same time, the coupling agent can also prevent other media from penetrating into the bonding interface, thereby improving the bonding interface state, which is beneficial to the aging resistance, stress resistance and electrical insulation properties of the dome 100.

[0051] Therefore, according to the dome 100 of the embodiment of the present application, by setting the damping layer 20 between the two reinforcement layers 10, setting the coupling agent at the bonding interface between the reinforcement layer 10 and the damping layer 20, and forming the first chemical bond between the coupling agent and the reinforcement layer 10, and forming the second chemical bond between the coupling agent and the damping layer 20, the reinforcement layer 10 and the damping layer 20 can be connected through the first chemical bond, the coupling agent and the second chemical bond, thereby effectively improving the adhesion between the reinforcement layer 10 and the damping layer 20, so that the reinforcement layer 10 and the damping layer 20 can be more closely connected, avoiding the delamination phenomenon of the dome 100 under high temperature or high frequency conditions. In addition, the dome 100 can better show rigidity and damping performance when vibrating at high frequencies, making the frequency response curve smoother, thereby improving the sound effect of the sound-generating device.

[0052] According to one embodiment of the present application, at least one of the reinforcement layer 10 and the damping layer 20 contains a coupling agent.

[0053] like Figure 1 As shown, in this embodiment, the damping layer 20 and the reinforcing layer 10 both contain coupling agents, that is, before the damping layer 20 and the reinforcing layer 10 are stacked, the film layers formed by each contain coupling agents, and after the two are stacked, they are heated and formed to obtain the dome 100. The coupling agents in the damping layer 20 and the reinforcing layer 10 can not only couple with their own damping layer 20 and reinforcing layer 10, but also can couple with the reinforcing layer 10 and the damping layer 20 connected thereto, which can effectively ensure the bonding force between the damping layer 20 and the reinforcing layer 10.

[0054] like Figure 2 As shown in FIG. 1 , in this embodiment, the reinforcing layer 10 contains a coupling agent, while the damping layer 20 does not contain a coupling agent. Figure 3 In the illustrated embodiment, the damping layer 20 contains a coupling agent, while the reinforcing layer 10 does not contain a coupling agent.

[0055] Therefore, a coupling agent is provided on one of the damping layer 20 and the reinforcing layer 10, and a first chemical bond and a second chemical bond can also be formed between the damping layer 20 and the reinforcing layer 10. On the basis of ensuring the bonding effect between the damping layer 20 and the reinforcing layer 10, the cost can be reasonably controlled.

[0056] In some specific embodiments of the present application, the reinforcing layer 10 or the damping layer 20 contains a coupling agent, and the coupling agent accounts for 0.2%-5% of the total weight of the reinforcing layer 10 or the damping layer 20 .

[0057] That is, the coupling agent may be present in the reinforcement layer 10, such as Figure 2 Alternatively, the coupling agent may be present in the damping layer 20, such as Figure 3 When the damping layer 20 or the reinforcement layer 10 contains a coupling agent, the coupling agent may account for 0.2%-5% of the total weight of the reinforcement layer 10 or the damping layer 20. For example, the coupling agent may account for 0.2%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5% of the total weight of the reinforcement layer 10 or the damping layer 20.

[0058] According to one embodiment of the present application, Figure 4 As shown, a coating layer 30 is provided between the reinforcing layer 10 and the damping layer 20 , and the coating layer 30 contains a coupling agent.

[0059] In other words, in this embodiment, before the damping layer 20 and the reinforcement layer 10 are stacked, their respective film layers do not contain coupling agents. Instead, when the two are stacked, a coating 30 containing a coupling agent is provided between the two. The coating 30 containing a coupling agent can be coated on the reinforcement layer 10 or on the damping layer 20, as long as the requirement that the coating 30 is located between the reinforcement layer 10 and the damping layer 20 is met.

[0060] By coating the coating 30 containing the coupling agent between the reinforcing layer 10 and the damping layer 20, it is possible to ensure not only the effective area of ​​the coupling agent between the reinforcing layer 10 and the damping layer 20 for forming the first chemical bond and the second chemical bond therewith, thereby making the adhesion between the reinforcing layer 10 and the damping layer 20 stronger, but also the coupling agent is arranged between the reinforcing layer 10 and the damping layer 20 in a coating manner, and the preparation method is efficient and convenient, thereby increasing product output.

[0061] In some specific embodiments of the present application, the thickness of the coating 30 is 2nm-5μm. That is to say, the thickness of the coating 30 containing the coupling agent can be between 2nm-5μm, including the end value. For example, the thickness of the coating 30 can be 2nm, 10nm, 100nm, 1μm, 2μm, 3μm, 4μm or 5μm. When the thickness of the coating 30 is 2nm-5μm, while improving the bonding performance of the reinforcing layer 10 and the damping layer 20, the thickness of the coating 30 has no significant effect on the overall thickness of the dome 100. This structure can not only improve the connection strength between the reinforcing layer 10 and the damping layer 20, but also ensure the lightness of the dome 100 structure, and avoid the phenomenon of stability between the reinforcing layer 10 and the damping layer 20 while ensuring the strength and toughness of the dome 100.

[0062] According to one embodiment of the present application, the damping layer 20 is rubber or thermoplastic elastomer, and the reinforcing layer 10 is carbon fiber resin-based prepreg. That is, the damping layer 20 can be made of rubber or thermoplastic elastomer, and the rubber or thermoplastic elastomer can react with the coupling agent to form a second chemical bond. The reinforcing layer 10 can be made of carbon fiber resin-based prepreg, and the carbon fiber can react with the coupling agent to form a first chemical bond.

[0063] By selecting rubber or thermoplastic elastomer as the damping layer 20 and carbon fiber resin-based prepreg as the reinforcing layer 10, the fusion and curing of the damping layer 20, the coupling agent and the reinforcing layer 10 can be achieved, thereby achieving effective connection between the damping layer 20, the coupling agent and the reinforcing layer 10, and avoiding stratification between the damping layer 20 and the reinforcing layer 10.

[0064] A coupling agent is added to one of the damping layer 20 and the reinforcement layer 10, or a coupling agent coating is added between the reinforcement layer 10 and the damping layer 20. During molding, the coupling agent chemically reacts with the damping layer 20 and the reinforcement layer 10 to form chemical bonds, so that the main structure of the dome 100 is formed into a structural form of reinforcement layer 10+damping layer 20+reinforcement layer 10, wherein the coupling agent between the reinforcement layer 10 and the damping layer 20 forms chemical bonds with the reinforcement layer 10 and the damping layer 20, respectively, and the coupling agent serves as a link between the damping layer 20 and the reinforcement layer 10, thereby improving the bonding strength between the reinforcement layer 10 and the damping layer 20.

[0065] When the dome 100 is formed, the two ends of the coupling agent form a first chemical bond and a second chemical bond with the reinforcement layer 10 and the damping layer 20 respectively. The chemical bond forms a bridge layer, which improves the bonding strength between the reinforcement layer 10 and the damping layer 20. The bridge layer can relax the interface stress and weaken the interface effect, so that the integrity and damping properties of the dome 100 are stronger.

[0066] In some specific embodiments of the present application, the rubber is one or more selected from acrylic rubber, polyurethane rubber, fluororubber, natural rubber, butyl rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, and silicone rubber.

[0067] That is to say, the damping layer 20 can be one of acrylic rubber, polyurethane rubber, fluororubber, natural rubber, butyl rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, and silicone rubber, or the damping layer 20 can be a combination of acrylic rubber, polyurethane rubber, fluororubber, natural rubber, butyl rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, and silicone rubber.

[0068] According to some embodiments of the present application, the thermoplastic elastomer may include at least one of a polyurethane elastomer, a polyester elastomer, a styrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, and a polyamide-based thermoplastic elastomer.

[0069] According to one embodiment of the present application, the resin is one or more selected from epoxy resin, phenolic resin, cyanate resin, and bismaleimide. That is, one of epoxy resin, phenolic resin, cyanate resin, and bismaleimide can be used as the reinforcing layer 10, or a mixture of epoxy resin, phenolic resin, cyanate resin, and bismaleimide can be used as the reinforcing layer 10. By selecting the above materials as the reinforcing layer 10, a reaction with a coupling agent can be achieved, thereby achieving connection between the reinforcing layer 10 and the damping layer 20.

[0070] In some specific embodiments of the present application, the coupling agent is one or more selected from the group consisting of an organosilicon coupling agent, an organochromium coupling agent, a titanate coupling agent, a phosphate ester, and an aluminate coupling agent. That is, one of the organosilicon coupling agent, the organochromium coupling agent, the titanate coupling agent, the phosphate ester, or the aluminate coupling agent can be used as a coupling agent to achieve the connection between the reinforcement layer 10 and the damping layer 20. Alternatively, a plurality of combinations of the organosilicon coupling agent, the organochromium coupling agent, the titanate coupling agent, the phosphate ester, or the aluminate coupling agent form a coupling agent to achieve the connection between the reinforcement layer 10 and the damping layer 20.

[0071] The coupling agent can be an organic silane coupling agent, such as KH550, 560, 570, etc. The general formula of the silane coupling agent can be written as RSiX3, where R is an active functional group with affinity and reactivity to the polymer molecule, which can interact with the long molecular chain in the organic matter to achieve a coupling effect. R can be, for example, vinyl, chloropropyl, epoxy, methacryloyl, amine, and mercapto, etc. X is an alkoxy group that can be hydrolyzed, which can be hydrolyzed to form a hydroxyl group, and further combined with the hydroxyl group on the surface of the carbon fiber in the reinforcement layer, such as methoxy, ethoxy, halogen, etc. The X group can be partially replaced by an organic-philic group, so that the coupling agent can ensure that the resin matrix and the fiber in the reinforcement layer participate in the coupling effect and better bond with the damping layer.

[0072] Titanate coupling agents can be selected from monoalkoxy type, monoalkoxy pyrophosphate type, integrated type and ligand type, and can be selected from isopropyl triisostearate titanate, bis(dioctyl pyrophosphate) ethylene titanate, isopropyl dioleyl (dioctyl phosphate) titanate, etc.

[0073] According to an embodiment of the present application, the total thickness of the dome 100 is 50 μm-300 μm, and the thickness of the damping layer 20 is 1 / 6-1 / 2 of the total thickness of the dome 100 .

[0074] That is, the total thickness of the dome 100 may be 50 μm-300 μm, inclusive. For example, the total thickness of the dome 100 may be 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, or 300 μm.

[0075] In addition, the thickness of the damping layer 20 can be 1 / 6-1 / 2 of the total thickness of the dome 100. If the damping layer 20 is thin, the damping property is poor, and the dome 100 will experience split vibration. If the damping layer 20 is thick, the damping property is insufficient compared to the rigidity of the reinforcement layer 10, which will cause the entire composite structure to have poor rigidity and poor high frequency. By setting the thickness of the damping layer 20 to 1 / 6-1 / 2 of the total thickness, the damping property of the damping layer 20 can be effectively improved, thereby ensuring that the dome 100 is not prone to split vibration.

[0076] In some specific embodiments of the present application, the loss factor of the dome 100 is 0.01-0.15, and the elastic modulus of the dome 100 is 15Gpa-80Gpa. For example, the loss factor of the dome 100 can be 0.01, 0.02, 0.04, 0.06, 0.08, 0.1, 0.12, 0.14 or 0.15. When the loss factor of the dome 100 is in the range of 0.01-0.15, the damping property of the material is improved, and the improved damping property of the dome 100 is conducive to reducing polarization during vibration, reducing product distortion, and improving listening yield.

[0077] The elastic modulus of the dome 100 is 15 GPa-80 GPa. For example, the elastic modulus of the dome 100 may be 15 GPa, 20 GPa, 25 GPa, 30 GPa, 35 GPa, 40 GPa, 45 GPa, 50 GPa, 55 GPa, 60 GPa, 65 GPa, 70 GPa, 75 GPa or 80 GPa.

[0078] That is to say, when the elastic modulus of the dome 100 is in the range of 15Gpa-80Gpa and includes the endpoint values, the larger the elastic modulus, the greater the stress of the elastic deformation of the dome 100, the greater the material stiffness, the smaller the elastic deformation, and the dome 100 has a strong ability to resist elastic deformation.

[0079] According to one embodiment of the present application, the loss factor of the damping layer 20 is 0.05-0.35, and the elastic modulus is greater than 30MPa. In other words, the loss factor of the damping layer 20 can be 0.05-0.3. For example, the loss factor can be 0.05, 0.1, 0.15, 0.2, 0.25, 0.3 or 0.35. When the loss factor of the damping layer 20 is in the range of 0.05-0.35 and includes the endpoint value, the damping performance of the damping layer 20 is optimal, thereby reducing the polarization phenomenon of the dome 100 during vibration. In addition, the elastic modulus of the damping layer 20 is greater than 30MPa, and the larger the elastic modulus, the smaller the elastic deformation of the damping layer 20, and the stronger the ability of the damping to resist elastic deformation. When playing high-frequency signals, the speaker using the dome 100 can reduce harmonic components, effectively improve THD (total harmonic distortion), and make the subjective listening experience clearer.

[0080] In some specific embodiments of the present application, the dome 100 is formed into a multi-layer structure in which the reinforcement layer 10 and the damping layer 20 are alternately superimposed and distributed, and both surface layers of the dome 100 are reinforcement layers 10. In other words, the dome 100 can also be a multi-layer structure in which the reinforcement layer 10 and the damping layer 20 are alternately superimposed and distributed, and the reinforcement layer 10 can be located on both surface layers of the dome 100.

[0081] For example, the dome 100 can be distributed as follows: reinforcement layer 10 / damping layer 20 / reinforcement layer 10, or reinforcement layer 10 / damping layer 20 / reinforcement layer 10 / damping layer 20 / reinforcement layer 10. Through the above distribution method, the toughness of the dome 100 can be improved, and the strength of the dome 100 can be improved. Optionally, the dome 100 can be a flat plate or a special-shaped structure, and the dome 100 can be a three-layer structure, a five-layer or multi-layer structure, and a coupling agent is added between each layer to improve the bonding performance. The dome reinforcement layer 10 has high rigidity and is connected to the damping layer 20 through coupling agent molecules. The structure is more compact, so that the overall structure has high rigidity and a certain toughness, and can significantly expand high frequencies. The damping layer 20 can well absorb the resonant energy brought by high-frequency vibrations, reduce the generation of split vibrations, and make the overall frequency response curve smoother.

[0082] In summary, according to the dome 100 of the embodiment of the present application, by arranging the damping layer 20 between the two reinforcement layers 10 and arranging the coupling agent at the bonding interface between the reinforcement layer 10 and the damping layer 20, the reinforcement layer 10 and the damping layer 20 can be connected through the first chemical bond, the coupling agent and the second chemical bond, so that the reinforcement layer 10 and the damping layer 20 can be more closely connected, avoiding the delamination of the dome 100 under high temperature or high frequency conditions. The dome 100 has sufficient rigidity and a certain damping property, which can avoid the generation of split vibration during high-frequency vibration, make the frequency response curve smoother, and thus improve the sound effect of the sound-generating device.

[0083] The diaphragm assembly according to the second embodiment of the present application includes: a diaphragm; a dome 100, the dome 100 being any of the dome 100 according to the embodiments of the present application, and the dome 100 is bonded to the diaphragm, and the bonding width between the dome 100 and the diaphragm is not less than 1 mm.

[0084] That is to say, the dome 100 can be bonded to the diaphragm. Optionally, the bonding width of the dome 100 and the diaphragm is ≥1mm. By bonding the diaphragm to the dome 100, not only is the connection between the dome 100 and the diaphragm facilitated, but the bonding width is set to be greater than one millimeter, thereby increasing the bonding area between the dome 100 and the diaphragm, and effectively improving the connection strength between the dome 100 and the diaphragm, thereby preventing the dome 100 and the diaphragm from being dispersed due to external high-frequency vibrations. In addition, by bonding the dome 100 to the diaphragm, later replacement and maintenance can be facilitated, avoiding damage to the overall structure and inability to use due to problems with the dome 100 or the diaphragm.

[0085] Optionally, the diaphragm includes one or more materials selected from engineering plastics (such as polyetheretherketone or polyarylate), elastomeric materials (such as thermoplastic polyurethane elastomer rubber, polyester rubber or rubber, etc.), adhesive films (such as acrylic adhesive, silicone adhesive, etc.), etc. It should be noted that the thickness of the diaphragm ranges from 0.01mm to 0.5mm. For example, the thickness of the diaphragm can be 0.01mm, 0.02mm, 0.03mm, 0.04mm or 0.05mm, etc. The thickness of the diaphragm is not limited here, and the thickness of the diaphragm can be selected according to the actual product requirements.

[0086] According to the third aspect of the embodiment of the present application, the sound-emitting device 1000 includes a vibration system and a magnetic circuit system coordinated with the vibration system, the vibration system includes a diaphragm assembly and a voice coil coupled to one side of the diaphragm assembly, the magnetic circuit system drives the voice coil to vibrate to drive the diaphragm assembly to produce sound, and the diaphragm assembly is the diaphragm assembly according to the embodiment of the present application.

[0087] In other words, the sound-generating device 1000 according to the embodiment of the present application is mainly composed of a vibration system and a magnetic circuit system matched with the vibration system. The vibration system is mainly composed of a diaphragm assembly and a voice coil combined on one side of the diaphragm assembly. The magnetic circuit system can drive the voice coil to vibrate and thus drive the diaphragm assembly to generate sound.

[0088] like Figure 5 and Figure 6 As shown, the sound generating device 1000 includes a dome 100 and a folding ring 200. Those skilled in the art may make corresponding adjustments according to actual product requirements. For example, the folding ring 200 may protrude toward the voice coil side, and the dome 100 may be located on the lower surface of the folding ring 200.

[0089] By combining the vibration system with the magnetic circuit system, the magnetic circuit system can drive the voice coil to vibrate and drive the diaphragm assembly to produce sound. Since the diaphragm assembly has the advantage of improving the sound quality, the sound device 1000 having the diaphragm assembly also has the same advantage, that is, the sound effect of the sound device 1000 is effectively improved in the end.

[0090] An electronic device according to an embodiment of the fourth aspect of the present application includes any one of the above-mentioned sound-emitting devices 1000.

[0091] That is to say, the electronic device has the sound device 1000. Since the sound device 1000 has the above functions and advantages, that is, the sound effect of the sound device 1000 can be improved, the electronic device also has the advantage of improving the sound effect.

[0092] The dome 100 of the present application will be described in detail below in conjunction with specific embodiments.

[0093] Embodiment 1

[0094] The dome 100 includes a reinforcement layer 10 and a damping layer 20, and the damping layer 20 can be sandwiched between two reinforcement layers 10. The reinforcement layer 10 is made of carbon fiber reinforced epoxy resin, and the damping layer 20 is made of nitrile rubber. The reinforcement layer 10 and the damping layer 20 can be connected by adding a coupling agent.

[0095] The specific steps are as follows:

[0096] First, the damping layer 20 may be prepared by coating or calendering, and the thickness of the prepared damping layer 20 is 30 μm.

[0097] Then, KH-550 (γ-aminopropyltriethoxysilane) coupling agent is sprayed on the upper and lower surfaces of the damping layer 20 , and the thickness of the sprayed coating is between 100 μm and 200 μm.

[0098] Finally, at room temperature, after the sprayed surface becomes dry, the damping layer 20 is laid between the two reinforcing layers 10, and the composite material of the reinforcing layer 10 and the damping layer 20 is placed in a mold. The molding temperature is set to 170°C ± 5°C, the pressure is 3MPa, and the insulation time is 10min.

[0099] The damping layer 20 and the reinforcing layer 10 are cured and cross-linked synchronously. The aminopropyl group in the coupling agent and the epoxy group in the epoxy resin open the ring to form a chemical bond. At the same time, the triethoxy group is hydrolyzed to react chemically with the nitrile group and the reinforcing agent carbon black in the nitrile rubber. Therefore, in addition to mutual penetration and entanglement at the two interfaces between the reinforcing layer 10 and the damping layer 20, obvious chemical bonds can be formed between the reinforcing layer 10 and the damping layer 20.

[0100] Comparative Example 1

[0101] The dome 100 includes two reinforcement layers 10 and a damping layer 20, and the damping layer 20 can be sandwiched between the two reinforcement layers 10. The reinforcement layer 10 is made of carbon fiber reinforced epoxy resin, and the damping layer 20 is made of nitrile rubber. The specific operation steps are as follows:

[0102] First, the damping layer 20 may be prepared by coating or calendering, and the thickness of the prepared damping layer 20 is 30 μm.

[0103] Then, the damping layer 20 is laid between the two reinforcing layers 10, and the composite reinforcing layer and the damping layer 20 are placed in a mold. The molding temperature is set to 170°C ± 5°C, the pressure is 3MPa, and the insulation time is 10min.

[0104] Finally, the damping layer 20 and the reinforcing layer 10 can be cured and cross-linked simultaneously, the two interfaces can penetrate and entangle with each other, and the two layers are bonded by van der Waals force and physical embedding.

[0105] like Figure 7As shown, from the test results, it can be seen that the embodiment 1 with the coupling agent added is smoother at high frequencies than the comparative example 1 without the coupling agent added. The dome 100 with the coupling agent added can show better damping performance. The improvement of damping performance can absorb the resonance energy brought by high-frequency vibration and reduce the generation of split vibration. In the acoustic FR curve, it can be seen that the 9.5K resonance peak is reduced, which improves the smoothness of its FR curve.

[0106] It can be concluded that by setting a coupling agent at the bonding interface between the reinforcement layer 10 and the damping layer 20, the reinforcement layer 10 and the damping layer 20 are connected by chemical bonds, ensuring that the reinforcement layer 10 and the damping layer 20 can be connected more closely. Under high temperature or high-frequency vibration, stratification is less likely to occur, and the overall structure is more stable. In addition, the resonant frequency of the overall structure will not fluctuate significantly, and ultimately it can be ensured that the sound-generating device 1000 has a good sounding effect. While providing sufficient rigidity, the dome 100 also has a certain damping property, which can avoid the generation of split vibration during high-frequency vibration and make the frequency response curve smoother.

[0107] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A dome, characterized in that: The invention comprises two reinforcing layers and a damping layer arranged between the two reinforcing layers, wherein the bonding interface between the reinforcing layer and the damping layer has a first chemical bond formed between a coupling agent and the reinforcing layer and a second chemical bond formed between the coupling agent and the damping layer, and the damping layer and the reinforcing layer are connected through the first chemical bond, the coupling agent and the second chemical bond; The total thickness of the dome is 50 μm-300 μm, and the thickness of the damping layer is 1 / 6-1 / 2 of the total thickness of the dome; the loss factor of the dome is 0.01-0.15, and the elastic modulus of the dome is 15 Gpa-80 Gpa.

2. The dome according to claim 1, characterized in that: At least one of the reinforcing layer and the damping layer contains the coupling agent.

3. The dome according to claim 2, characterized in that: The reinforcing layer or the damping layer contains the coupling agent, and the coupling agent accounts for 0.2%-5% of the total weight of the reinforcing layer or the damping layer.

4. The dome according to claim 1, characterized in that: A coating layer is provided between the reinforcing layer and the damping layer, and the coating layer contains the coupling agent.

5. The dome according to claim 4, characterized in that: The thickness of the coating is 2nm-5μm.

6. The dome according to claim 1, characterized in that: The damping layer is made of rubber or thermoplastic elastomer, and the reinforcing layer is made of carbon fiber resin-based prepreg.

7. The dome according to claim 6, characterized in that: The rubber is one or more selected from acrylic rubber, polyurethane rubber, fluororubber, natural rubber, butyl rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, and silicone rubber.

8. The dome according to claim 6, characterized in that: The thermoplastic elastomer includes at least one of polyurethane elastomer, polyester elastomer, styrene-based thermoplastic elastomer, polyolefin-based thermoplastic elastomer and polyamide-based thermoplastic elastomer.

9. The dome according to claim 6, characterized in that: The resin is one or more selected from epoxy resin, phenolic resin, cyanate resin and bismaleimide.

10. The dome according to claim 1, characterized in that: The coupling agent is one or more selected from the group consisting of an organic silicon coupling agent, an organic chromium coupling agent, a titanate coupling agent, a phosphate ester, and an aluminate coupling agent.

11. The dome according to claim 1, characterized in that: The loss factor of the damping layer is 0.05-0.35, and the elastic modulus is greater than 30 MPa.

12. The dome according to any one of claims 1 to 11, characterized in that: The dome is formed into a multi-layer structure in which the reinforcement layers and the damping layers are alternately stacked and distributed, and the two surface layers of the dome are both the reinforcement layers.

13. A diaphragm assembly, characterized in that: include: Diaphragm; A dome, wherein the dome is the dome according to any one of claims 1 to 12, and the dome is bonded to the diaphragm.

14. A sound-generating device, characterized in that: It includes a vibration system and a magnetic circuit system matched with the vibration system, the vibration system includes a diaphragm assembly and a voice coil combined on one side of the diaphragm assembly, the magnetic circuit system drives the voice coil to vibrate to drive the diaphragm assembly to make sound, and the diaphragm assembly is a diaphragm assembly according to claim 13.

15. An electronic device, characterized in that: Includes the sound-generating device as claimed in claim 14.

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