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 damping layer is a rubber containing a nitrile group or an ester group, the shear strength of the dome at room temperature is 0.6Mpa-80Mpa, and the loss factor of the dome at room temperature is 0.04-0.3. The damping layer of the present application uses a rubber containing a nitrile group or an ester group, and the rubber containing such polar groups can increase the adhesion between the damping layer and the reinforcement layer, thereby making the damping layer and the reinforcement layer more tightly connected, and less prone to stratification. While providing sufficient rigidity, it also has a certain damping property, which can avoid the generation of split vibration during high-frequency vibration, making the frequency response curve smoother 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] Most of the existing domes are flat, aluminum alloy domes or carbon fiber molded domes. For the flat dome structure, an aluminum foil / foam / aluminum foil structure or a carbon fiber / foam / carbon fiber structure is usually adopted. Although this structure is light in weight and can meet the problem of medium and low frequency sensitivity, it is difficult to meet the high-frequency performance due to the defects of poor molding state, low strength and rigidity.

[0003] For conventional aluminum alloy domes, although they can be formed and have better strength and rigidity than flat plates, they have defects such as heavy mass, poor mid-frequency, and poor metal damping, which makes it easy to produce split vibrations at high frequencies, leading to premature failure.

[0004] Although the carbon fiber molded dome has the advantages of strong rigidity, lower mass than aluminum alloy, and better performance in mid- and high-frequency ranges, it is prone to split vibration at high frequencies due to its poor damping properties.

[0005] Therefore, a new technical solution is needed to meet the current requirements of speakers for lightness, thinness, mid-high frequencies, etc. Summary of the invention

[0006] One object of the present application is to provide a dome that can improve the adhesion between the reinforcement layer and the damping layer, has good damping properties, and is not prone to delamination.

[0007] Another object of the present application is to provide a diaphragm assembly.

[0008] Another object of the present application is to provide a sound-generating device.

[0009] Another object of the present application is to provide an electronic device.

[0010] In order to achieve the above objectives, this application provides the following technical solutions.

[0011] According to the dome of the first aspect of the present application, the dome comprises two reinforcement layers and a damping layer arranged between the two reinforcement layers, wherein the damping layer is a rubber containing a nitrile group or an ester group, the shear strength of the dome at room temperature is 0.6Mpa-80Mpa, and the loss factor of the dome at room temperature is 0.04-0.3.

[0012] According to some embodiments of the present application, the damping layer is a rubber containing a nitrile group, and the damping layer is a copolymer rubber or a mixed rubber containing at least one of nitrile rubber, hydrogenated nitrile rubber, nitrile ester rubber, terminal hydroxy nitrile rubber, carboxyl nitrile rubber, liquid nitrile rubber, and partially cross-linked nitrile rubber.

[0013] According to some embodiments of the present application, the molar content of nitrile groups in the damping layer is 25%-50%.

[0014] According to some embodiments of the present application, the damping layer is a rubber containing an ester group, and the damping layer is a copolymer rubber or a mixed rubber containing at least one of acrylic rubber, ethylene acrylate, ethylene vinyl acetate rubber, and polyurethane rubber.

[0015] According to some embodiments of the present application, the molar content of ester groups in the damping layer is 30%-95%.

[0016] According to some embodiments of the present application, the peeling force between the reinforcement layer and the damping layer is greater than 200g / 25mm.

[0017] According to some embodiments of the present application, the hardness of the damping layer is 30A-85A, and the loss factor of the damping layer is greater than 0.10.

[0018] According to some embodiments of the present application, the total thickness of the dome is 40 μm-300 μm, and the thickness of the damping layer is 1 / 8-1 / 3 of the total thickness of the dome.

[0019] According to some embodiments of the present application, the Young's modulus of the spherical top is greater than 6 GPa.

[0020] According to some embodiments of the present application, the reinforcement layer is a carbon fiber resin-based prepreg.

[0021] According to some embodiments of the present application, the reinforcement layer and the damping layer are simultaneously vulcanized and hot-pressed into one.

[0022] According to some embodiments of the present application, the resin matrix in the carbon fiber resin-based prepreg is selected from one or more of epoxy resin, phenolic resin, bismaleimide resin, cross-linked polyimide, and vinyl epoxy.

[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 second aspect of the present application, the diaphragm assembly includes: a diaphragm; a dome, wherein the dome is the dome described in any one of the above embodiments, and the dome is bonded to the diaphragm.

[0025] According to the third aspect 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 emit sound, and the diaphragm assembly is the diaphragm assembly of any of the above-mentioned embodiments.

[0026] According to an electronic device of an embodiment of the fourth aspect of the present application, the electronic device includes a sound-emitting device of any of the above embodiments.

[0027] According to the dome of the embodiment of the present application, a damping layer is provided between two reinforcement layers, and the damping layer adopts rubber containing nitrile group (-CN) or ester group (-COOR). The rubber containing such polar groups can increase the adhesion between the damping layer and the reinforcement layer, and a strong intermolecular force is formed between the damping layer and the reinforcement layer, so that the damping layer and the reinforcement layer are connected more tightly and are not easy to delaminate. The dome has sufficient rigidity and certain damping properties, which can avoid the generation of split vibration during high-frequency vibration and make the frequency response curve smoother. When playing high-frequency signals, the speaker using the dome of the embodiment of the present application can reduce the harmonic components, effectively improve THD (total harmonic distortion), make the subjective listening experience clearer, and improve RB (RUB & BUZZ).

[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 sound-generating device according to an embodiment of the present application;

[0032] Figure 3 is a schematic diagram of a partial structure of a sound-generating device according to an embodiment of the present application;

[0033] Figure 4 It is a test curve diagram of Example 1 and Comparative Example 1 according to the embodiments of the present application.

[0034] Reference numerals

[0035] Sound generating device 1000;

[0036] Ball top 100; folding ring 200;

[0037] Reinforcement layer 10 ; Damping layer 20 . DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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 as part of the specification.

[0041] 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.

[0042] 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.

[0043] The dome 100 according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0044] like Figure 1 As shown, the dome 100 according to the embodiment of the present application includes two reinforcement layers 10 and a damping layer 20 disposed between the two reinforcement layers 10 .

[0045] Specifically, the damping layer 20 is a rubber containing a nitrile group or an ester group, the shear strength of the dome 100 at room temperature is 0.6 MPa-80 MPa, and the loss factor of the dome 100 at room temperature is 0.04-0.3.

[0046] In other words, the dome 100 according to the embodiment of the present application includes a reinforcement layer 10 and a damping layer 20, the number of the reinforcement layers 10 is at least two, and the number of the damping layer 20 is at least one, that is, the dome 100 according to the embodiment of the present application is composed of at least two reinforcement layers 10 and one damping layer 20, and the reinforcement layer 10 and the damping layer 20 can be laminated and composited. When the number of the reinforcement layers 10 is two and the number of the damping layer 20 is one, the damping layer 20 is located between the two reinforcement layers 10. In other words, when the number of the damping layer 20 is one, one reinforcement layer 10 is arranged on one side of the damping layer 20, and another reinforcement layer 10 is arranged on the other side of the damping layer 20, that is, the reinforcement layers 10 are respectively located on both sides of the damping layer 20. When the number of the reinforcement layers 10 is multiple, a damping layer 20 can be arranged between two adjacent reinforcement layers 10. That is, the dome 100 having a multi-layer structure is formed by at least two reinforcing layers 10 and at least one damping layer 20 , and the reinforcing layers 10 and the damping layers 20 can be compositely formed into a sandwich-like structure.

[0047] It should be noted that the reinforcement layer 10 can be used as a reinforcement structure, and after being combined with the damping layer 20, it can still maintain a high modulus, providing sufficient rigidity for the overall structure of the dome 100. The reinforcement layer 10 located on the outermost side can be used as a reinforcement panel.

[0048] Among them, the damping layer 20 is made of rubber, which has excellent damping properties. That is to say, the inside of the dome 100 uses rubber as the damping layer 20, which can convert the resonance absorption generated by high-frequency vibration into internal energy, making the peak-to-valley difference of the high-frequency frequency response smaller, making the high-frequency curve smoother, and is conducive to the overall smoothness of the listening experience.

[0049] In addition, the damping layer 20 is a rubber containing a nitrile group (-CN) or an ester group (-COOR), so the damping layer 20 has polarity, and the polar groups in the nitrile group or ester group of the damping layer 20 form a strong intermolecular force with the matrix of the reinforcing layer 10, thereby increasing the adhesion between the damping layer 20 and the reinforcing layer 10. Before the reinforcing layer 10 and the damping layer 20 are compounded, the damping layer 20 is a rubber containing a nitrile group (-CN) or an ester group (-COOR), and when the reinforcing layer 10 and the damping layer 20 are compounded, the polar groups in the nitrile group or ester group of the damping layer 20 form a strong intermolecular force with the reinforcing layer 10, that is, the rubber containing such polar groups can increase the adhesion between the damping layer and the reinforcing layer. The two reinforcement layers 10 can be connected to the corresponding damping layer 20 respectively through strong intermolecular forces, ensuring that the reinforcement layer 10 and the damping layer 20 are more closely connected. Even under high temperature or high frequency vibration, the reinforcement layer 10 and the damping layer 20 are not prone to stratification.

[0050] In addition, the damping layer 20 is a rubber containing a nitrile group (-CN) or an ester group (-COOR), and the dome 100 structure has a shear strength (short beam) at room temperature between 0.6MPa and 80MPa. For example, the dome 100 structure has a shear strength at room temperature of 0.6MPa, 1MPa, 5MPa, 10MPa, 20MPa, 30MPa, 40MPa, 50MPa, 60MPa, 70MPa or 80MPa, etc. It should be noted that the greater the shear strength, the better the integrity of the dome 100, and it is less likely to cause interlayer damage.

[0051] The loss factor of the dome 100 structure of the present application at room temperature is 0.04-0.3. For example, the loss factor of the dome 100 can be 0.04, 0.05, 0.06, 0.1, 0.15, 0.2 or 0.3, etc. When the loss factor of the dome 100 is in the range of 0.04-0.3 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.

[0052] 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, the damping layer 20 is a rubber containing a nitrile group (-CN) or an ester group (-COOR), and a strong intermolecular force is formed between the damping layer 20 and the reinforcement layer 10, so that the damping layer 20 and the reinforcement layer 10 are connected more tightly and are not easy to delaminate. The dome 100 has sufficient rigidity and a certain damping property, which can avoid the generation of split vibration during high-frequency vibration and make the frequency response curve smoother. When playing high-frequency signals, the speaker using the dome 100 of the embodiment of the present application can reduce the harmonic components, effectively improve THD (total harmonic distortion), make the subjective listening experience clearer, and improve RB (RUB & BUZZ).

[0053] According to one embodiment of the present application, the damping layer 20 is a rubber containing a nitrile group, and the damping layer 20 is a copolymer rubber or a mixed rubber containing at least one of nitrile rubber, hydrogenated nitrile rubber, nitrile ester rubber, terminal hydroxy nitrile rubber, carboxyl nitrile rubber, liquid nitrile rubber, and partially cross-linked nitrile rubber.

[0054] In other words, when the damping layer 20 is a rubber containing nitrile groups, the rubber containing nitrile groups can be acrylonitrile rubber and its modified rubber. For example, the damping layer 20 is a copolymer or mixed rubber including acrylonitrile rubber, hydrogenated nitrile rubber, nitrile ester rubber, hydroxyl-terminated nitrile rubber, carboxyl nitrile rubber, liquid nitrile rubber, partially cross-linked nitrile rubber, etc. containing one or more nitrile groups. When the above rubber is adopted, it is conducive to generating a strong intermolecular force between the damping layer 20 and the reinforcement layer 10, which can not only improve the overall resilience of the dome 100, but also improve the connection force between the dome 10 and the reinforcement layer 10, so that each layer of the dome 100 is connected more closely.

[0055] In some specific embodiments of the present application, the molar content of nitrile groups in the damping layer 20 is 25%-50%. Among them, nitrile groups are strong polar groups. The increase in the content of strong polar groups helps to increase its cohesive energy density and increase the intermolecular force, thereby improving its strength and damping properties. At the same time, the polar groups help to enhance the adhesion of the bonding interface, so that the reinforcement layer 10 and the damping layer 20 can be more closely connected to avoid the spherical top 100 from delamination under high temperature or high frequency conditions. It should be noted that 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.

[0056] According to an embodiment of the present application, the damping layer 20 is a rubber containing an ester group, and the damping layer 20 is a copolymer rubber or a mixed rubber containing at least one of acrylic rubber, ethylene acrylate, ethylene vinyl acetate rubber, and polyurethane rubber.

[0057] In other words, when the damping layer 20 is a rubber containing an ester group, the rubber containing an ester group can be an acrylic rubber and a modified rubber thereof. For example, the damping layer 20 is a copolymer or blended rubber including one or more of acrylic rubber, ethylene acrylate, ethylene vinyl acetate rubber, and polyurethane rubber, that is, the above rubbers can be used alone or in combination. By selecting the above materials as the damping layer 20, it is beneficial to make the damping layer 20 and the reinforcing layer 10 more firmly connected due to the strong intermolecular force.

[0058] In some specific embodiments of the present application, the molar content of the ester group in the damping layer 20 accounts for 30%-95%. That is to say, when the damping layer 20 is a rubber containing an ester group, the molar content of the ester group in the rubber containing an ester group accounts for 30%-95%. Among them, the ester group is a strong polar group, and the polarity of the rubber can be increased by the ester group, which is more conducive to the adhesion of the damping layer 20 and the reinforcing layer 10. When the ester group exists in the side chain, as the content of the ester group increases, the damping and temperature resistance of the damping layer 20 will be improved simultaneously.

[0059] According to the dome 100 of claim 1, it is characterized in that the peeling force between the reinforcement layer 10 and the damping layer 20 is greater than 200g / 25mm. Specifically, a strong intermolecular force is formed between the reinforcement layer 10 and the damping layer 20, so that sufficient adhesion is formed between the reinforcement layer 10 and the damping layer 20. When the peeling force is greater than 200g / 25mm, the stability of the structure of the dome 100 can be guaranteed, and the delamination phenomenon of the dome 100 can be effectively avoided.

[0060] In some specific embodiments of the present application, the hardness of the damping layer 20 is 30A-85A, and the loss factor of the damping layer 20 is greater than 0.10. For example, the hardness of the damping layer 20 can be 30A, 32A, 35A, 40A, 45A, 50A, 60A, 70A, 80A, 82A or 85A, etc. The reinforcing layer 10 of the dome 100 has a high rigidity, a strong intermolecular force between the reinforcing layer 10 and the damping layer 20, a small gap, and a more compact structure, so that the overall structure has a high rigidity and a certain toughness, and can significantly expand high frequencies, and the damping layer 20 can well absorb the resonance energy brought by high-frequency vibrations, reduce the generation of segmented vibrations, and make the overall frequency response curve smoother. The loss factor of the damping layer 20 can be 0.11, 0.12 or 0.15, etc. When the loss factor of the damping layer 20 is greater than 0.10, the damping performance of the damping layer 20 is optimal, and the polarization phenomenon occurring during the vibration of the dome 100 can be reduced. When playing high-frequency signals, the speaker using the dome 100 of the embodiment of the present application can reduce harmonic components, effectively improve THD (total harmonic distortion), and make the subjective listening experience clearer, while improving RB (unusual sound detection: RUB & BUZZ).

[0061] According to an embodiment of the present application, the total thickness of the dome 100 is 40 μm-300 μm, including end values. For example, the total thickness of the dome 100 can be 40 μm, 50 μm, 60 μm, 70 μm, 100 μm, 150 μm, 200 μm, 250 μm or 300 μm.

[0062] In addition, the thickness of the damping layer 20 is 1 / 8-1 / 3 of the total thickness of the dome 100. It should be noted that if the damping layer 20 is thin, the damping performance is poor, and the dome 100 will experience split vibration. If the damping layer 20 is thick, the damping performance is insufficient compared to the rigidity of the reinforcement layer 10, which will lead to poor rigidity of the entire composite structure and poor high frequency. By setting the thickness of the damping layer 20 to 1 / 8-1 / 3 of the total thickness of the dome 100, the damping performance of the damping layer 20 can be effectively improved, thereby ensuring that the dome 100 is not prone to split vibration.

[0063] According to an embodiment of the present application, the Young's modulus of the dome 100 is greater than 6 GPa, for example, the Young's modulus of the dome 100 may be 7 GPa, 8 GPa, 9 GPa or 10 GPa, etc. When the Young's modulus of the dome 100 is set to be greater than 6 GPa, the strength and toughness of the dome 100 may be improved, and the delamination of the dome 100 may be prevented under high-frequency vibration.

[0064] According to an embodiment of the present application, the reinforcement layer 10 is a carbon fiber resin-based prepreg. That is, the reinforcement layer 10 is a carbon fiber reinforcement layer. Since the carbon fiber reinforcement layer of the dome 100 has high rigidity, the molecular connection between the dome 100 and the damping layer 20 is small, and the structure is more compact, the overall structure has high rigidity and certain damping properties, 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.

[0065] The carbon fibers in the reinforcing layer 10 may be high-strength T300 and T700 grades, or ultra-high-strength T800 and T1000 series carbon fibers, preferably high-modulus fibers of different grades such as M30, M40 and M46.

[0066] In some specific embodiments of the present application, the reinforcing layer 10 and the damping layer 20 are simultaneously vulcanized and hot-pressed into one. After hot pressing, the reinforcing layer 10 and the damping layer 20 form an integrated hot-pressed structure, which can form an interpenetrating structure at the interface during the high-temperature hot pressing process, which helps to increase its integrity and adhesion, avoid the problem of high cross-linking density of rubber molecules after vulcanization, poor wettability of glue or film to rubber, resulting in low adhesion, and solve the problem of easy cracking due to long-term vibration fatigue.

[0067] For example, the uncured damping layer 20 and the carbon fiber reinforced resin prepreg are multi-layered and then cured as a whole. The hot pressing process makes the distance between the damping layer 20 and the reinforcement layer 10 small enough to achieve This intermolecular distance enables the polar group nitrile or ester group to generate a higher intermolecular attraction with the reinforcing material to increase the bonding strength, while hot pressing integral molding can form a physical embedding at the interface.

[0068] According to one embodiment of the present application, the resin is one or more selected from epoxy resin, phenolic resin, bismaleimide resin, cross-linked polyimide, vinyl epoxy, etc. That is, the resin can be selected from heat-reactive resins such as epoxy resin, phenolic resin, bismaleimide resin, cross-linked polyimide, vinyl epoxy, or other thermoplastic resins.

[0069] 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.

[0070] For example, the dome 100 may 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, the toughness of the dome 100 can be improved, and the strength of the dome 100 can be improved. Optionally, the dome 100 may be a flat plate or a special-shaped structure, and the dome 100 may be a three-layer structure, a five-layer structure or a multi-layer structure, and the bonding performance is improved by using rubber containing nitrile or ester groups as the damping layer 20. The reinforcement layer 10 of the dome 100 has high rigidity and is connected to the damping layer 20 containing nitrile or ester groups. The structure is more compact, so that the overall structure has high rigidity and certain toughness, and can significantly expand high frequencies. The damping layer 20 can well absorb the resonance energy brought by high-frequency vibrations, reduce the generation of split vibrations, and make the overall frequency response curve smoother.

[0071] During production, the reinforcement layer 10 / damping layer 20 / reinforcement layer 10, or the reinforcement layer 10 / damping layer 20 / reinforcement layer 10 / damping layer 20 / reinforcement layer 10 can be stacked, and then integrally hot-pressed, which can be a flat plate or a special-shaped structure. After the reinforcement layer 10 and the damping layer 20 are compounded together, they are placed in a mold, and then heated and cross-linked and cured. The temperature range can be 110°C-190°C, and the molding time can be 5min-4h. The damping layer 20 and the reinforcement layer 10 can blend with each other during curing to form an interpenetrating interface. In addition, the nitrile group or ester group itself has polarity, which can form a strong intermolecular force to increase the adhesion. Through the above aspects, the problem of long-term vibration fatigue and easy cracking can be solved. In addition, during production and processing, the damping layer 20 can be mixed into a raw rubber of 10μm-80μm, and then compounded with the reinforcement layer 10, for example, with the carbon fiber reinforced resin reinforcement layer 10.

[0072] 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, the damping layer 20 is a rubber containing a nitrile group or an ester group, so that the intermolecular force between the reinforcement layer 10 and the damping layer 20 is enhanced, and has a strong adhesive force, so that the reinforcement layer 10 and the damping layer 20 can be more closely connected, and the dome 100 is prevented from being delaminated under high temperature or high frequency conditions. The dome 100 has sufficient rigidity and a certain damping property, and can avoid the generation of split vibration during high-frequency vibration, making the frequency response curve smoother, thereby improving the sound effect of the sound device 1000.

[0073] like Figure 2 and Figure 3 As shown, the present application also discloses a diaphragm assembly including a diaphragm and a dome 100, wherein the dome 100 is the dome 100 of any of the above embodiments, and the dome 100 is bonded to the diaphragm. For example, the diaphragm and the dome 100 are bonded by glue or tape. Optionally, the width of the bonding area between the dome 100 and the diaphragm is not less than 1 mm.

[0074] 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.

[0075] According to one embodiment of the present application, the diaphragm is composed of a composite of one or more materials including engineering plastics (such as polyetheretherketone (PEEK), polyarylate (PAR), etc.), elastomeric materials (such as thermoplastic polyurethane elastomer rubber (TPU), thermoplastic polyester elastomer (TPEE) or other rubbers, etc.), and adhesive films (such as acrylic adhesives, silicone adhesives, etc.).

[0076] Optionally, the thickness of the diaphragm is between 0.01 mm and 0.5 mm. For example, the thickness of the diaphragm may be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm or 0.05 mm, etc. The thickness of the diaphragm is not limited here, and the thickness of the diaphragm may be selected according to the actual product requirements.

[0077] The present application also discloses a sound-generating device 1000, including a vibration system and a magnetic circuit system coordinated with the vibration system, the vibration system including 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 generate sound, and the diaphragm assembly is the diaphragm assembly of any of the above-mentioned embodiments.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] The present application also discloses an electronic device, comprising the sound-generating device 1000 of any of the above embodiments.

[0082] 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.

[0083] The dome 100 of the present application will be described in detail below in conjunction with specific embodiments.

[0084] Embodiment 1

[0085] The dome 100 includes two reinforcement layers 10 and a damping layer 20 , and the damping layer 20 is sandwiched between the two reinforcement layers 10 . The thickness of the damping layer 20 is 30 μm, and the thickness of a single reinforcement layer 10 is 60 μm.

[0086] Among them, the damping layer 20 uses conventional nitrile rubber, and the nitrile rubber is selected to contain 33% acrylonitrile; the reinforcing agent uses medium-super wear-resistant carbon black, with a content of 80 parts; the vulcanization system uses a vulcanization system, and the amount is 1.5 parts; other additives are added as needed. After mixing, it can be prepared into a membrane material with a thickness of 30μm by coating or calendering. The reinforcement layer 10 uses unidirectional fiber reinforced phenolic resin prepreg, one reinforcement layer 10 includes a first carbon fiber layer and a second carbon fiber layer, and another reinforcement layer 10 includes a third carbon fiber layer and a fourth carbon fiber layer.

[0087] The dome 100 is composed of the first carbon fiber layer, the second carbon fiber layer, the damping layer 20, the third carbon fiber layer and the fourth carbon fiber layer from top to bottom, that is, the damping layer 20 is laid between the second carbon fiber layer and the third carbon fiber layer. The fiber arrangement direction of the first carbon fiber layer is perpendicular to the fiber arrangement direction of the second carbon fiber layer, and the fiber arrangement direction of the third carbon fiber layer is perpendicular to the fiber arrangement direction of the fourth carbon fiber layer. This multi-axial carbon fiber composite can improve the disadvantage of the weak strength of unidirectional fibers in another direction, so that the strength in both directions can be significantly improved. In addition, the first carbon fiber layer and the fourth carbon fiber layer can be arranged in parallel, and the first carbon fiber layer and the fourth carbon fiber layer can be perpendicular to the long axis direction of the dome 100.

[0088] After the first carbon fiber layer, the second carbon fiber layer, the damping layer 20, the third carbon fiber layer and the fourth carbon fiber layer of Example 1 are compounded, the above-mentioned compound materials can be put into a mold, the mold can be closed at a temperature of 50°C, pressurized at 0.8MPa, the temperature can be raised to 160°C and kept warm for 30 minutes, and the temperature can be lowered to 50°C to demold, and then the ball top 100 corresponding to Example 1 can be prepared.

[0089] Comparative Example 1

[0090] Comparative Example 1 also uses two reinforcing layers and one damping layer, and the damping layer is arranged between the two reinforcing layers. Different from Example 1, the damping layer in Comparative Example 1 uses styrene-butadiene rubber (SBR) with the same damping coefficient after vulcanization, and the loss factor of the damping layer is 0.2 at room temperature. Among them, 1.5 parts of vulcanizing agent and 8 parts of reinforcing agent are added to the styrene-butadiene rubber, and other additives are added as needed. After mixing, it can be prepared into a 30μm thick raw rubber film by coating or calendering.

[0091] Similar to Example 1, the reinforcement layer in Comparative Example 1 uses unidirectional fiber reinforced phenolic resin prepreg. The dome of Comparative Example 1 is arranged from top to bottom as a first carbon fiber layer, a second carbon fiber layer, a damping layer, a third carbon fiber layer and a fourth carbon fiber layer, wherein the fiber arrangement direction of the first carbon fiber layer is perpendicular to that of the second carbon fiber layer, and the fiber arrangement direction of the third carbon fiber layer is perpendicular to that of the fourth carbon fiber layer.

[0092] After compounding the first carbon fiber layer, the second carbon fiber layer, the damping layer, the third carbon fiber layer and the fourth carbon fiber layer of comparative example one, the composite materials can be placed in a mold, the mold can be closed at a temperature of 50°C, pressurized at 0.8MPa, the temperature can be raised to 160°C and kept warm for 30 minutes, the temperature can be lowered to 50°C and the mold can be demolded, and then the ball top corresponding to comparative example one can be prepared.

[0093] like Figure 4 As shown, the product test results of Example 1 are represented by a solid line, and the product test results of Comparative Example 1 are represented by a dotted line.

[0094] From the test results, it can be seen that for Example 1, the modulus of the composite plate modified by nitrile rubber after composite hot pressing can reach 27GPa, the loss factor is 0.09, and the nitrile rubber modified damping ball top 100 has a significantly increased interlayer adhesion and improved shear resistance due to the presence of nitrile groups. The interlayer peeling force of the ball top 100 is 350g / 25mm, and the shear strength is 2.4MPa.

[0095] For comparative example 1, the modulus of the composite board modified with styrene-butadiene rubber is 26 GPa. Due to the small interlayer adhesion, the shear strength is small, which is 1.2 MPa, the loss factor is 0.05, and the interlayer peeling force is 150 g / 25 mm.

[0096] like Figure 4 As shown in the accompanying FR (frequency response curve), the resonance peak of the nitrile rubber modified damping product at 9.75K is significantly reduced. The damping converts the resonant mechanical energy into heat energy, reduces the vibration amplitude, and makes the overall FR curve flatter. The peak-to-valley difference of the nitrile rubber modified product is 11.3dB, while the peak-to-valley difference of the styrene-butadiene rubber modified product is 14.6dB. It can be seen that nitrile rubber has a more obvious advantage in improving damping than styrene-butadiene.

[0097] It can be concluded that the damping layer 20 uses rubber containing nitrile or ester groups, so that the intermolecular force between the reinforcing layer 10 and the damping layer 20 is enhanced, ensuring that the reinforcing 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 ensure 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.

[0098] 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, It is characterized in that It comprises two reinforcing layers and a damping layer arranged between the two reinforcing layers, wherein the damping layer is a rubber containing a nitrile group, and the molar content of the nitrile group in the damping layer accounts for 25%-50%; or, the damping layer is a rubber containing an ester group, and the molar content of the ester group in the damping layer accounts for 30%-95%; The shear strength of the dome at room temperature is 0.6Mpa-80Mpa, the loss factor of the dome at room temperature is 0.04-0.3, and the reinforcement layer is a carbon fiber resin-based prepreg.

2. The dome according to claim 1, It is characterized in that The damping layer is a rubber containing nitrile groups, and the damping layer is a copolymer rubber or a mixed rubber containing at least one of nitrile rubber, hydrogenated nitrile rubber, nitrile ester rubber, terminal hydroxyl nitrile rubber, carboxyl nitrile rubber, liquid nitrile rubber, and partially cross-linked nitrile rubber.

3. The dome according to claim 1, It is characterized in that The damping layer is a rubber containing an ester group, and the damping layer is a copolymer rubber or a mixed rubber containing at least one of acrylic rubber, ethylene acrylate, ethylene vinyl acetate rubber, and polyurethane rubber.

4. The dome according to claim 1, It is characterized in that The peeling force between the reinforcing layer and the damping layer is greater than 200 g / 25 mm.

5. The dome according to claim 1, It is characterized in that The hardness of the damping layer is 30A-85A, and the loss factor of the damping layer is greater than 0.

10.

6. The dome according to claim 1, It is characterized in that The total thickness of the dome is 40 μm-300 μm, and the thickness of the damping layer is 1 / 8-1 / 3 of the total thickness of the dome.

7. The dome according to claim 1, It is characterized in that The Young's modulus of the dome is greater than 6 GPa.

8. The dome according to claim 1, It is characterized in that The reinforcing layer and the damping layer are simultaneously vulcanized and hot-pressed into one body.

9. The dome according to claim 1, It is characterized in that The resin matrix in the carbon fiber resin-based prepreg is selected from one or more of epoxy resin, phenolic resin, bismaleimide resin, cross-linked polyimide, and vinyl epoxy.

10. The dome according to any one of claims 1 to 9, It is 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.

11. A diaphragm assembly, It is characterized in that include: Diaphragm; A dome, wherein the dome is the dome according to any one of claims 1 to 10, and the dome is bonded to the diaphragm.

12. A sound-generating device, It is 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 11.

13. An electronic device, It is characterized in that Includes the sound-generating device as claimed in claim 12.

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