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 reinforcement layer and the damping layer respectively contain a cross-linking agent, and the reinforcement layer and the damping layer are heated and cross-linked after being composited to form a chemical bond at the bonding interface between the damping layer and the reinforcement layer, and the damping layer and the reinforcement layer are connected by chemical bonds. The present application arranges a damping layer between the two reinforcement layers, and the reinforcement layer and the damping layer respectively contain a cross-linking agent, and the reinforcement layer and the damping layer are heated and cross-linked after being composited to form a chemical bond at the bonding interface 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, make the frequency response curve smoother, and improve 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 that can improve the adhesion between the reinforcement layer and the damping layer, has good damping properties, and is not prone to delamination.

[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] 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 reinforcement layers and the damping layer respectively contain a cross-linking agent, and the reinforcement layer and the damping layer are composited and heated to cross-link to form a chemical bond at the bonding interface between the damping layer and the reinforcement layer, and the damping layer and the reinforcement layer are connected by the chemical bond.

[0011] According to some embodiments of the present application, the damping layer is a rubber of an organic amine cross-linking system, and the reinforcing layer is a carbon fiber epoxy resin-based prepreg.

[0012] According to some embodiments of the present application, the damping layer is selected from one or more of acrylic rubber, polyurethane rubber, fluororubber, natural rubber, butyl rubber, isoprene rubber, and styrene-butadiene rubber.

[0013] According to some embodiments of the present application, the cross-linking agent in the damping layer is an organic amine cross-linking agent, and the organic amine cross-linking agent is at least one of hexamethylenediamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine carbamate, N,N′-dicinnamidine-1,6-hexanediamine, and 4,4′-methylenebiscarbamate.

[0014] According to some embodiments of the present application, the epoxy resin uses an organic amine or amide crosslinking agent, and the organic amine or amide crosslinking agent is selected from one or more of hexamethylenediamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polymethylenediamine, meta-xylene diamine, meta-phenylenediamine, and thiolamine.

[0015] According to some embodiments of the present application, the damping layer is diene rubber, and the reinforcing layer is epoxy resin prepreg.

[0016] According to some embodiments of the present application, the cross-linking agent in the damping layer is selected from one or more of phenolic resin, modified phenolic resin, and maleimide.

[0017] According to some embodiments of the present application, the crosslinking agent in the epoxy resin is a resin crosslinking agent; or, the crosslinking agent in the epoxy resin is a mixture of an organic amine or amide crosslinking agent and a resin crosslinking agent; wherein the resin crosslinking agent is one or more of a phenolic resin, a modified phenolic resin, and maleimide, and the organic amine or amide crosslinking agent includes one or more of hexamethylenediamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polymethylenediamine, meta-xylene diamine, meta-phenylenediamine, and thiolamine.

[0018] According to some embodiments of the present application, the peeling force between the reinforcing layer and the damping layer is greater than 300g / 25mm, and the heat resistance temperature of the chemical bond between the reinforcing layer and the damping layer is greater than 120°C.

[0019] 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.

[0020] According to some embodiments of the present application, the loss factor of the dome is 0.04-0.15, and the elastic modulus of the dome is 15 Gpa-70 Gpa.

[0021] According to some embodiments of the present application, the loss factor of the damping layer is 0.1-0.35, and the hardness of the damping layer is 50A-80A.

[0022] According to some embodiments of the present application, the heating temperature after the reinforcement layer and the damping layer are composited is 100° C.-230° C.

[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 according to any one of the above items, 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 based on the above-mentioned diaphragm assembly.

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

[0027] According to the dome of the embodiment of the present application, a damping layer is arranged between two reinforcement layers, and a cross-linking agent is arranged in the reinforcement layer and the damping layer. After the reinforcement layer and the damping layer are compounded, a heating cross-linking reaction is performed so that a chemical bond is formed at the bonding interface between the damping layer and the reinforcement layer. The damping layer and the reinforcement layer are connected by chemical bonds, so that the connection between the damping layer and the reinforcement layer is tighter and not easy to delaminate. The dome has sufficient rigidity and a certain damping property. It 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.

[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 diagram of the structure of the ball top according to an embodiment of the present application when it is not cross-linked;

[0031] Figure 2 This is a schematic diagram of the structure of the ball top after cross-linking according to an embodiment of the present application;

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

[0033] Figure 4 is a schematic diagram of a partial structure of a sound-generating device according to an embodiment of the present application;

[0034] Figure 5 It is a test curve diagram of Example 1 and Comparative Example 1 according to the embodiments of the present application.

[0035] Reference numerals

[0036] Sound generating device 1000;

[0037] Ball top 100; folding ring 200;

[0038] Reinforcement layer 10 ; Damping layer 20 ; Transition layer 30 . DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] The dome 100 according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0045] like Figure 1 and Figure 2 As shown, the dome 100 according to the embodiment of the present application includes two reinforcement layers 10 and a damping layer 20 arranged between the two reinforcement layers 10, wherein the reinforcement layers 10 and the damping layer 20 respectively contain a cross-linking agent, and the reinforcement layers 10 and the damping layer 20 are composited and heated to cross-link to form a chemical bond at the bonding interface between the damping layer 20 and the reinforcement layer 10, and the damping layer 20 and the reinforcement layer 10 are connected by chemical bonds.

[0046] In other words, 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, the damping layer 20 is disposed between the two reinforcement layers 10, and both the reinforcement layers 10 and the damping layer 20 constituting the dome 100 contain a crosslinking agent. Figure 1 As shown, before the reinforcing layer 10 and the damping layer 20 are laminated and compounded but before cross-linking, the reinforcing layer 10 and the damping layer 20 respectively contain dispersed cross-linking agents.

[0047] After the two reinforcement layers 10 are respectively compounded with the damping layer 20, they are cured by heating and cross-linking reaction, so that chemical bonds are formed at the bonding interfaces of the two reinforcement layers 10 and the damping layer 20 under the action of the cross-linking agent. The two reinforcement layers 10 can be connected to the damping layer 20 respectively through chemical bonds, thereby ensuring that the reinforcement layers 10 and the damping layer 20 are more closely connected, and even under high temperature or high frequency vibration, the reinforcement layers 10 and the damping layer 20 are not prone to delamination.

[0048] like Figure 2 As shown, after the reinforcing layer 10 and the damping layer 20 are heated and cross-linked, the cross-linking agent at the bonding interface of the damping layer 20 and the reinforcing layer 10 undergoes a cross-linking reaction to form a transition layer 30, and the transition layer 30 may be a connection structure composed of chemical bonds formed at the bonding interface between the damping layer 20 and the reinforcing layer 10. Compared with the intermolecular force, the transition layer 30 composed of chemical bonds makes the bonding interface between the reinforcing layer 10 and the damping layer 20 more adhesive, and the transition layer 30 can relax the interface stress and prevent the expansion of the interface cracks. Compared with the solution of simply adding the damping layer 20, the present application has the advantage of significantly improving the high-frequency resonance peak in the product.

[0049] Therefore, 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 reinforcement layers 10 and the damping layer 20 are provided with a crosslinking agent, and the reinforcement layers 10 and the damping layer 20 are compounded and then heated and crosslinked to form a chemical bond at the bonding interface of the damping layer 20 and the reinforcement layer 10, and the damping layer 20 and the reinforcement layer 10 are connected by chemical bonds, so that the connection between the damping layer 20 and the reinforcement layer 10 is tighter and not easy to delaminate. The dome 100 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.

[0050] In some specific embodiments of the present application, the damping layer 20 is a rubber of an organic amine cross-linking system, and the reinforcing layer 10 is a carbon fiber epoxy resin-based prepreg.

[0051] That is to say, in the dome 100 of the present application, the damping layer 20 is suitable for using rubber with an organic amine cross-linking system, and the reinforcement layer 10 uses carbon fiber epoxy resin-based prepreg, so that the dome 100 has a certain resilience and mechanical strength, and can also ensure the overall stability of the structure of the dome 100.

[0052] According to an embodiment of the present application, the damping layer 20 is selected from one or more of acrylic rubber, polyurethane rubber, fluororubber, natural rubber, butyl rubber, isoprene rubber, and styrene-butadiene rubber. In other words, when the damping layer 20 is selected from one or more of the above rubber combinations, it can not only improve the overall resilience of the dome 100, but also fully cross-link with the reinforcement layer 10, so that each layer of the dome 100 is more tightly connected.

[0053] In some specific embodiments of the present application, when the damping layer 20 adopts the above-mentioned rubber, the cross-linking agent in the damping layer 20 is an organic amine cross-linking agent, and the organic amine cross-linking agent is at least one of hexamethylenediamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine carbamate, N,N′-dicinnamidine-1,6-hexanediamine, and 4,4′-methylenebiscarbamate.

[0054] In other words, at least one of hexamethylenediamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine carbamate, N,N′-biscinnamylene-1,6-hexanediamine or 4,4′-methylenebiscarbamate can be added to the damping layer 20 as an organic amine crosslinking agent, and the above crosslinking agents can be used alone or in combination. The damping layer 20 and the reinforcement layer 10 can be cured to form a chemical bond through a crosslinking reaction, so that the dome 100 is not prone to delamination under the influence of high temperature or high frequency.

[0055] Optionally, for the damping layer 20 formed by acrylic rubber (ACM, ANM, AEM), polyurethane rubber, fluororubber rubber, the crosslinking agent is an organic amine crosslinking agent, and the content is 1-6 parts. For the damping layer 20 formed by natural rubber, butyl rubber, isoprene rubber, styrene-butadiene rubber, etc., an organic amine is selected as a crosslinking agent, and the amount used is 1.5-3 parts. Among them, the content of the crosslinking agent here is the weight part applicable when the damping layer 20 as a whole is 100 parts by weight.

[0056] According to one embodiment of the present application, the epoxy resin uses an organic amine or amide crosslinking agent, and the organic amine or amide crosslinking agent is selected from one or more of hexamethylenediamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polymethylenediamine, meta-xylene diamine, meta-phenylenediamine, and thiolamine.

[0057] That is to say, the damping layer 20 and the reinforcing layer 10 are cured and connected by an organic amine or amide crosslinking agent. When the organic amine crosslinking agent or amide crosslinking agent acts between the damping layer 20 and the reinforcing layer 10, it can not only cause the rubber to undergo a crosslinking reaction, but also can cure the epoxy resin, so that a chemical bond can be formed between the damping layer 20 and the reinforcing layer 10, so that the connection between the damping layer 20 and the reinforcing layer 10 is more firm. One can be selected from hexamethylenediamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polymethylenediamine, meta-xylene diamine, meta-phenylenediamine or thiolamine as a crosslinking agent for crosslinking reaction, or multiple can be selected from hexamethylenediamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polymethylenediamine, meta-xylene diamine, meta-phenylenediamine or thiolamine as a crosslinking agent to achieve a crosslinking reaction between the damping layer 20 and the reinforcing layer 10. In addition, it should be noted that other compound cross-linking agents may contain amides or other types of cross-linking agents.

[0058] In some specific embodiments of the present application, when the damping layer 20 is made of diene rubber, the reinforcing layer 10 is epoxy resin prepreg.

[0059] Optionally, according to an embodiment of the present application, the cross-linking agent in the damping layer is selected from one or more of phenolic resin, modified phenolic resin, and maleimide.

[0060] By adding one or more of phenolic resin, modified phenolic resin or maleimide as a cross-linking agent to the damping layer 20, the cross-linking and curing of the damping layer 20 and the cross-linking agent inside the reinforcement layer 10 can be better achieved, and the cross-linking agents at the interface can penetrate each other and chemically cross-link to form a transition layer 30. Compared with the intermolecular force, the chemical bond makes the adhesion between the two interfaces greater.

[0061] In some specific embodiments of the present application, the crosslinking agent in the epoxy resin is a resin crosslinking agent, or the crosslinking agent in the epoxy resin is a mixture of an organic amine or amide crosslinking agent and a resin crosslinking agent, wherein the resin crosslinking agent is one or more of a phenolic resin, a modified phenolic resin, and maleimide, and the organic amine or amide crosslinking agent includes one or more of hexamethylenediamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polymethylenediamine, meta-xylene diamine, meta-phenylenediamine, and thiolamine.

[0062] In other words, when the damping layer is diene rubber and the reinforcing layer is epoxy resin prepreg, a resin crosslinking agent or a mixture of an organic amine or amide crosslinking agent and a resin crosslinking agent can be selected as a crosslinking agent to cure and connect the damping layer and the reinforcing layer.

[0063] In addition, one of phenolic resin, modified phenolic resin and maleimide can be selected as the resin crosslinking agent, or multiple of phenolic resin, modified phenolic resin and maleimide can be selected as the resin crosslinking agent. One of hexamethylenediamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polymethylenediamine, meta-xylene diamine, meta-phenylenediamine and mercaptanamine can also be selected as the organic amine or amide crosslinking agent, or a mixture of hexamethylenediamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polymethylenediamine, meta-xylene diamine, meta-phenylenediamine and mercaptanamine can be selected as the organic amine or amide crosslinking agent.

[0064] According to an embodiment of the present application, the peeling force between the reinforcing layer 10 and the damping layer 20 is greater than 300 g / 25 mm, and the heat resistance temperature of the chemical bond between the reinforcing layer 10 and the damping layer 20 is greater than 120° C.

[0065] Specifically, the cross-linking agent inside the reinforcing layer 10 and the cross-linking agent inside the damping layer 20 are cross-linked and cured, and a chemical bond is formed between the reinforcing layer 10 and the damping layer 20, so that sufficient adhesion is formed between the reinforcing layer 10 and the damping layer 20. When the peeling force is greater than 300g / 25mm, the stability of the dome 100 structure can be guaranteed, and the delamination of the dome 100 can be effectively avoided.

[0066] In addition, the chemical bond between the reinforcement layer 10 and the damping layer 20 can withstand a temperature greater than 120° C. That is, when the temperature is less than or equal to 120° C., the energy of the chemical bond between the reinforcement layer 10 and the damping layer 20 can remain stable, thereby improving the stability of the connection between the reinforcement layer 10 and the damping layer 20 .

[0067] Optionally, the resin content in the carbon fiber reinforced epoxy resin composite material of the reinforcement layer 10 is 25%-50%. For example, the resin content can be 25%, 30%, 35%, 40%, 45% or 50%, etc., and the specific content of the resin is not limited here. By setting the resin content in the carbon fiber reinforced epoxy resin composite material of the reinforcement layer 10 to 25%-50%, it can not only ensure that there is a strong bonding strength between the fibers and between the fibers and the damping layer 20, but also ensure that the overall structure of the dome 100 has good stability after curing, is not easy to deform, and has no fiber exposure on the surface.

[0068] In addition, the surface density of the reinforcement layer 10 is in the range of 15 g / m 2 -160g / m 2 , preferably 25g / m 2 -100g / m 2 That is to say, the enhanced surface density can be 15g / m 2 , 20g / m 2, 25g / m 2 , 30g / m 2 , 40g / m 2 , 50g / m 2 , 60g / m 2 , 70g / m 2 , 80g / m 2 , 90g / m 2 , 100g / m 2 , 110g / m 2 , 120g / m 2 , 130g / m 2 , 140g / m 2 , 150g / m 2 or 160g / m 2 The range of the surface density of the reinforcing layer 10 is not specifically limited. By setting the surface density of the reinforcing layer 10 to 15 g / m 2 -160g / m 2 range, thereby ensuring sufficient strength and rigidity of the reinforcement layer 10, and further ensuring the stability of the structure after curing.

[0069] The carbon fiber in the reinforcing layer 10 can be selected from high-strength or high-modulus fibers, preferably high-modulus fibers, to ensure the rigidity of the panel. The epoxy resin in the reinforcing layer 10 can be selected from bisphenol A epoxy resin, bisphenol F epoxy resin, polyphenol glycidyl ether epoxy resin, aliphatic glycidyl ether type, glycidyl ester type, phenolic epoxy resin and other types of epoxy resins.

[0070] In some specific embodiments 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. For example, the total thickness of the dome 100 can be 50 μm, 100 μm, 150 μm, 200 μm, 250 μm or 300 μm, etc. The total thickness of the dome 100 can be selected according to actual needs.

[0071] The thickness of the damping layer 20 is 1 / 6-1 / 2 of the total thickness of the dome 100. When the damping layer 20 is thin, the damping property is poorly improved, and split vibration will also occur. When the damping layer 20 is thick, the damping layer 20 is less rigid than the reinforcing layer 10, resulting in poor rigidity of the entire composite structure, which will lead to 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.

[0072] According to one embodiment of the present application, the loss factor of the dome 100 is 0.04-0.15, and the elastic modulus of the dome 100 is 15Gpa-70Gpa. For example, the loss factor of the dome 100 may be 0.04, 0.06, 0.08, 0.1, 0.12, 0.14 or 0.15, etc. Among them, if the loss factor is too high, the overall material rigidity of the dome 100 is too weak, and the high frequency of FR (frequency response) will be poor. If the loss factor is low, the dome 100 cannot play the effect of reducing resonance at high frequencies, and the FR curve will have obvious peaks and valleys, which is not conducive to the overall listening experience. Therefore, the loss factor can be set to 0.04-0.15, including the endpoint value, so that the high-frequency stability of the dome 100 can be guaranteed.

[0073] In addition, the elastic modulus of the dome 100 can be 15Gpa-70Gpa, for example, the elastic modulus of the dome 100 can be 15Gpa, 20Gpa, 25Gpa, 30Gpa, 35Gpa, 40Gpa, 45Gpa, 50Gpa, 55Gpa, 60Gpa, 65Gpa or 70Gpa, etc. In other words, the carbon fiber in the reinforcing layer 10 can be selected from high-strength or high-modulus fibers, preferably high-modulus fibers, to ensure the rigidity of the panel. When the elastic modulus of the dome 100 is set between 15Gpa-70Gpa, including the end value, the strength and toughness of the dome 100 can be improved, and the dome 100 can be prevented from being delaminated under high-frequency vibration.

[0074] Optionally, the damping value of the damping layer 20 can be changed by adjusting the formulation to achieve indicators of high modulus and high hardness.

[0075] In some specific embodiments of the present application, the loss factor of the damping layer 20 is 0.1-0.35, and the hardness of the damping layer 20 is 50A-80A. The carbon fiber reinforced layer 10 of the dome 100 has high rigidity, and is intermolecularly connected with the damping layer 20, with small gaps and a denser structure, so that the overall structure has high rigidity and a certain toughness, and can significantly expand high frequencies. The damping layer 20 can absorb the resonant energy brought by high-frequency vibrations, reduce the generation of split vibrations, and make the overall frequency response curve smoother. When playing high-frequency signals, the speaker using the dome 100 can reduce harmonic components, effectively improve THD (total harmonic distortion), make the subjective listening experience clearer, and improve RB (abnormal sound detection: Rub & Buzz).

[0076] According to an embodiment of the present application, the heating temperature after the reinforcing layer 10 and the damping layer 20 are composited is 100°C-230°C. That is to say, the heating temperature after the reinforcing layer 10 and the damping layer 20 are composited can be selected between 100°C-230°C, including the end value. For example, the heating temperature for the cross-linking reaction after the reinforcing layer 10 and the damping layer 20 are composited can be 100°C, 120°C, 140°C, 160°C, 180°C, 200°C, 220°C or 230°C. Preferably, the heating temperature after the reinforcing layer 10 and the damping layer 20 are composited can be set to 160-200°C. In this temperature range, the reinforcing layer 10 and the damping layer 20 can be fully cross-linked to form a stable chemical bond, thereby ensuring that the rigidity of the dome 100 is sufficient and split vibration is not easy to occur.

[0077] In addition, when the heating temperature after the reinforcement layer 10 and the damping layer 20 are composited is within the temperature range of 160°C-200°C, the internal cross-linking agents of the damping layer 20 and the reinforcement layer 10 begin to cross-link and solidify. Since the same cross-linking agent is used for the two materials, the cross-linking agents at the interface can penetrate each other and chemically cross-link to form a transition layer 30. Compared with the intermolecular force, the chemical bond makes the adhesion between the two interfaces stronger. This layer can relax the interface stress and prevent the expansion of the interface cracks. Compared with the structure of simply adding the damping layer 20, this structure has the advantage of significantly improving the high-frequency resonance peak.

[0078] In some specific embodiments of the present application, the dome 100 is formed into a multi-layer structure in which the reinforcement layers 10 and the damping layers 20 are alternately stacked and distributed, and both surface layers of the dome 100 are the reinforcement layers 10 .

[0079] That is to say, 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, as long as the requirement that the reinforcement layer 10 is located on two surface layers of the dome 100 is met. 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, etc. Through the above distribution method, the strength of the dome 100 can be improved.

[0080] In summary, according to the dome 100 of the embodiment of the present application, by respectively including a crosslinking agent in the reinforcement layer 10 and the damping layer 20, the reinforcement layer 10 and the damping layer 20 are composited and heated for crosslinking so that a chemical bond is formed at the bonding interface of the damping layer 20 and the reinforcement layer 10, and the damping layer 20 and the reinforcement layer 10 can be connected by a chemical bond. This ensures that the damping layer 20 and the reinforcement layer 10 are more closely connected, and avoids the delamination of the damping layer 20 and the reinforcement layer 10 under high temperature or high-frequency vibration. 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.

[0081] The diaphragm assembly according to the embodiment of the second aspect of the present application includes: a diaphragm and a dome 100, and the dome 100 is bonded to the diaphragm.

[0082] 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 contact area, effectively improving the connection strength between the dome 100 and the diaphragm, thereby avoiding the dispersion of the dome 100 and the diaphragm 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.

[0083] 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.

[0084] According to the sound-emitting device 1000 of the third aspect embodiment of the present application, it 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 of the above embodiment.

[0085] 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.

[0086] like Figure 3 and Figure 4 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.

[0087] 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.

[0088] The electronic device according to the fourth embodiment of the present application includes the sound device 1000 of the above embodiment. That is, the electronic device has the sound device 1000, and since the sound device 1000 has the above functions and advantages, that is, it can improve the sound effect of the sound device 1000, the electronic device also has the advantage of improving the sound effect.

[0089] The dome 100 of the present application will be described in detail below in conjunction with specific embodiments.

[0090] Embodiment 1

[0091] 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 damping layer 20 uses an ACM (acrylate) rubber layer. The ACM damping layer 20 can use N, N'-bis-cinnamyl fork-1,6-hexanediamine crosslinking agent, and the crosslinking agent is added to the damping layer 20 according to 1.5 parts (1.5g of crosslinking agent is added to every 100g of rubber). After adding other additives and mixing together, a film material with a thickness of 30μm can be prepared by coating or calendaring.

[0092] The reinforcing layer 10 is sequentially arranged from top to bottom as a first carbon fiber layer, a second carbon fiber layer, a third carbon fiber layer and a fourth carbon fiber layer. The damping layer 20 can be laid between the second carbon fiber layer and the third carbon fiber layer.

[0093] The fiber arrangement directions of the first carbon fiber layer and the second carbon fiber layer are arranged perpendicularly, the fiber arrangement directions of the third carbon fiber layer and the fourth carbon fiber layer are arranged perpendicularly, the first carbon fiber layer and the fourth carbon fiber layer are 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. The multi-axial carbon fiber composite can improve the disadvantage of the weak strength of the unidirectional fiber in another direction, so that the strength of the dome 100 in both directions can be significantly improved.

[0094] 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 are composited, they can be subjected to hot pressing treatment through a mold, with the temperature set to 180° C. and the heat preservation time being 5 min-10 min, and then the dome 100 is prepared.

[0095] Among them, the resin of the reinforcing layer 10 can be selected from glycidyl ether epoxy resin, and the cross-linking agent can be selected from meta-phenylenediamine cross-linking agent. The cross-linking agent in the ACM at the interface can be chemically cross-linked with the epoxy resin in the reinforcing layer 10 through ring opening. The meta-phenylenediamine cross-linking agent in the reinforcing layer 10 can be chemically cross-linked with the ACM to form a transition layer 30, so that the two layers are better bonded.

[0096] Comparative Example 1

[0097] The dome 100 includes two reinforcing layers 10 and a damping layer 20, and the damping layer 20 can be sandwiched between the two reinforcing layers 10. The damping layer 20 uses an NBR (nitrile rubber) rubber layer, and two parts of sulfur are added to the NBR as a crosslinking agent. After adding other additives and mixing, a film material is prepared by coating or calendering, and the thickness of the film material is 30 μm. The NBR damping layer 20 is melted at high temperature and bonded to the reinforcing layer 10. Since there is no mutually reactive component between the reinforcing layer 10 and the damping layer 20, the interface is connected only by van der Waals force.

[0098] like Figure 5 As shown, the product test results of the ACM modified damping of Example 1 are represented by a solid line, and the product test results of the NBR rubber layer of Comparative Example 1 are represented by a dotted line.

[0099] From the test results, it can be seen that the resonance peak of the line of Example 1 is significantly reduced at 9.75K, while the line of Comparative Example 1 and the line of Example 1 have obvious resonance peaks. Since the damping of the ACM dome 100 used in Example 1 can convert the resonant mechanical energy into heat energy, the vibration amplitude of the dome 100 can be reduced, making the overall FR curve flatter, which has a more obvious advantage in improving damping than NBR.

[0100] It can be concluded that by providing a cross-linking agent in the reinforcing layer 10 and the damping layer 20, the reinforcing layer 10 and the damping layer 20 are connected by chemical bonds, and the reinforcing layer 10 and the damping layer 20 can be more tightly connected. Under high temperature or high-frequency vibration, stratification is not easy 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 sound-generating effect. The dome 100 has sufficient rigidity and a certain damping property. It can avoid the generation of split vibration during high-frequency vibration and make the frequency response curve smoother.

[0101] 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 reinforcing layer and the damping layer respectively contain a crosslinking agent, the reinforcing layer and the damping layer are composited and heated to crosslink to form a chemical bond at the bonding interface between the damping layer and the reinforcing layer, and the damping layer and the reinforcing layer are connected through the chemical bond; The total thickness of the dome is 50 μm-300 μm, 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 0.04-0.15, and the elastic modulus of the dome is 15 Gpa-70 Gpa.

2. The dome according to claim 1, characterized in that: The damping layer is a rubber of an organic amine cross-linking system, and the reinforcing layer is a carbon fiber epoxy resin-based prepreg.

3. The dome according to claim 2, characterized in that: The damping layer is selected from one or more of acrylic rubber, polyurethane rubber, fluororubber, natural rubber, butyl rubber, isoprene rubber, and styrene-butadiene rubber.

4. The dome according to claim 3, characterized in that: The crosslinking agent in the damping layer is an organic amine crosslinking agent, and the organic amine crosslinking agent is at least one of hexamethylenediamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine carbamate, N,N′-dicinnamidine-1,6-hexanediamine, and 4,4′-methylenebiscarbamate.

5. The dome according to claim 2, characterized in that: The epoxy resin is selected from an organic amine or amide crosslinking agent, and the organic amine or amide crosslinking agent is selected from one or more of hexamethylenediamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polymethylenediamine, meta-xylene diamine, meta-phenylenediamine, and thiolamine.

6. The dome according to claim 1, characterized in that: The damping layer is diene rubber, and the reinforcing layer is epoxy resin prepreg.

7. The dome according to claim 6, characterized in that: The cross-linking agent in the damping layer is selected from one or more of phenolic resin, modified phenolic resin and maleimide.

8. The dome according to claim 6, characterized in that: The cross-linking agent in the epoxy resin is a resin cross-linking agent; Or, the crosslinking agent in the epoxy resin is a mixture of an organic amine or amide crosslinking agent and a resin crosslinking agent; Among them, the resin cross-linking agent is one or more of phenolic resin, modified phenolic resin, and maleimide, and the organic amine or amide cross-linking agent includes one or more of hexamethylenediamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polymethylenediamine, meta-xylene diamine, meta-phenylenediamine, and thiolamine.

9. The dome according to claim 1, characterized in that: The peeling force between the reinforcing layer and the damping layer is greater than 300g / 25mm, and the heat-resistant temperature of the chemical bond between the reinforcing layer and the damping layer is greater than 120°C.

10. The dome according to claim 1, characterized in that: The loss factor of the damping layer is 0.1-0.35, and the hardness of the damping layer is 50A-80A.

11. The dome according to claim 1, characterized in that: The heating temperature after the reinforcing layer and the damping layer are combined is 100° C.-230° C.

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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