Diaphragm and speaker

Abstract

The present invention discloses a diaphragm and a loudspeaker, wherein the diaphragm comprises at least one layer of a thermoreversible covalently cross-linked elastic body layer, and the technical solution of the present invention can improve the heat resistance and chemical resistance of the diaphragm.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic products, and in particular to a diaphragm and a loudspeaker using the diaphragm. Background Art

[0002] With the increasing demand for high-power, waterproof and high-quality speakers, products using elastomeric materials that combine rigidity and flexibility as speaker diaphragms have been promoted. Since thermoplastic elastomers have good thermoplasticity, are easy to process, and have a wide hardness range, they have been widely used in speaker diaphragms. However, when using thermoplastic elastomer materials as speaker diaphragms, due to the limitations of the structural design of the speaker, in order to achieve higher performance and larger displacement, the heat generated by the voice coil increases. If the heat dissipation is limited, the local temperature near the voice coil is too high. The poor heat resistance of thermoplastic elastomer materials can easily cause the thermoplastic elastomer materials to produce large irreversible displacements or even fractures, resulting in the risk of speaker performance loss. In addition, thermoplastic elastomer materials have poor chemical resistance. During use, low molecular weight chemicals can easily penetrate into the elastomer and swell, causing the diaphragm structure to deform, which can also lead to loss of acoustic performance of the speaker or product failure.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The main purpose of the present invention is to provide a diaphragm and a loudspeaker, aiming to improve the heat resistance and chemical resistance of the diaphragm.

[0005] To achieve the above-mentioned object, the diaphragm proposed in the present invention includes at least one layer of thermoreversible covalently cross-linked elastomer.

[0006] Optionally, the material of the thermoreversible covalently cross-linked elastomer layer is selected from at least one of a thermoreversible covalently cross-linked polyester elastomer, a thermoreversible covalently cross-linked polyurethane elastomer, a thermoreversible covalently cross-linked silicone elastomer, a thermoreversible covalently cross-linked acrylic rubber elastomer, a thermoreversible covalently cross-linked olefin elastomer, and a thermoreversible covalently cross-linked styrene elastomer.

[0007] Optionally, the material of the thermoreversible covalently cross-linked elastomer layer is the thermoreversible DA covalently cross-linked elastomer.

[0008] Optionally, the elongation at break of the thermoreversible covalently cross-linked elastomeric layer is greater than 200%; and / or the thermoreversible de-crosslinking temperature of the thermoreversible covalently cross-linked elastomeric layer is 80°C to 250°C.

[0009] Optionally, the tensile modulus of the thermoreversible covalently cross-linked elastomer layer ranges from 1 MPa to 600 MPa; and / or the thickness of the thermoreversible covalently cross-linked elastomer layer ranges from 5 μm to 200 μm.

[0010] Optionally, the thermoreversible covalently cross-linked elastomer layer is provided with at least two layers, and two adjacent thermoreversible covalently cross-linked elastomer layers are connected by heat pressing or by an adhesive layer.

[0011] Optionally, the diaphragm further includes a thermoplastic elastomer layer, which is one of the surface layers or middle layers of the diaphragm, and the thermoplastic elastomer layer is connected to the thermoreversible covalently cross-linked elastomer layer by heat pressing or by an adhesive layer.

[0012] Optionally, the material of the thermoplastic elastomer layer is at least one of polyester thermoplastic elastomer, polyurethane thermoplastic elastomer, polyamide thermoplastic elastomer, polystyrene thermoplastic elastomer, polyolefin thermoplastic elastomer and dynamically vulcanized rubber / thermoplastic plastic blend thermoplastic elastomer.

[0013] Optionally, the thermoreversible covalently cross-linked elastomer layer is provided with one layer, and the thermoplastic elastomer layer is hot-pressed connected to the thermoreversible covalently cross-linked elastomer layer or connected to the thermoreversible covalently cross-linked elastomer layer through an adhesive layer; or, the thermoreversible covalently cross-linked elastomer layer is provided with two layers, and the two layers of the thermoreversible covalently cross-linked elastomer layers are respectively provided on the two surfaces of the thermoplastic elastomer layer, and the thermoplastic elastomer layer is hot-pressed connected to the thermoreversible covalently cross-linked elastomer layer or connected to the thermoreversible covalently cross-linked elastomer layer through an adhesive layer; or, the thermoreversible covalently cross-linked elastomer layer is provided with multiple layers, the thermoplastic elastomer layer is provided with multiple layers, the multiple layers of the thermoreversible covalently cross-linked elastomer layers and the multiple layers of the thermoplastic elastomer layers are stacked, and at least one surface layer of the diaphragm is a thermoreversible covalently cross-linked elastomer layer, and two adjacent layers are connected by an adhesive layer or hot-pressed.

[0014] Optionally, the diaphragm further comprises a plastic substrate layer, which is one of the surface layers or middle layers of the diaphragm, and the plastic substrate layer is connected to the thermoreversible covalently cross-linked elastomer layer by heat pressing or by an adhesive layer.

[0015] Optionally, the material of the plastic substrate layer is selected from at least one of polyetheretherketone, polyarylate, polyetherimide, polyimide, polyphenylene sulfide, polyethylene naphthalate, and polyethylene terephthalate.

[0016] Optionally, the thermoreversible covalently cross-linked elastomer layer is provided with one layer, and the plastic substrate layer is hot-pressed and connected to the thermoreversible covalently cross-linked elastomer layer or connected through an adhesive layer; or, the thermoreversible covalently cross-linked elastomer layer is provided with two layers, and the two layers of the thermoreversible covalently cross-linked elastomer layers are respectively provided on the two surfaces of the plastic substrate layer, and the plastic substrate layer is hot-pressed and connected to the thermoreversible covalently cross-linked elastomer layer or connected through an adhesive layer; or, the thermoreversible covalently cross-linked elastomer layer is provided with multiple layers, and the plastic substrate layer is provided with multiple layers, the multiple layers of the thermoreversible covalently cross-linked elastomer layers and the multiple layers of the plastic substrate layers are stacked, and at least one surface layer of the diaphragm is a thermoreversible covalently cross-linked elastomer layer, and two adjacent layers are connected by an adhesive layer or hot-pressed.

[0017] Optionally, the diaphragm also includes a thermoplastic elastomer layer and a plastic substrate layer, the thermoplastic elastomer layer, the plastic substrate layer and the thermoreversible covalently cross-linked elastomer layer are hot-pressed connected or connected by an adhesive layer, and at least one surface layer of the diaphragm is the thermoreversible covalently cross-linked elastomer layer.

[0018] The present invention also proposes a loudspeaker, comprising a ball top, a folding ring and a voice coil, wherein the folding ring is arranged at the edge of the loudspeaker, the ball top is connected to one side of the folding ring, and the voice coil is connected to the other side of the folding ring, the ball top and / or the folding ring is a diaphragm, and the diaphragm comprises at least one layer of thermoreversible covalently cross-linked elastomer layer.

[0019] Optionally, the thermoreversible covalently cross-linked elastomer layer of the diaphragm is arranged toward the voice coil.

[0020] In the technical solution of the present invention, the diaphragm includes at least one layer of thermoreversible covalent cross-linked elastomer layer. Here, the diaphragm adopts thermoreversible covalent cross-linked elastomer material, which can show good heat resistance and chemical resistance. At the same time, it also has the characteristics of thermoplasticity at high temperature and easy processing, which can effectively reduce its processing cost, thereby reducing the production cost of the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of an embodiment of a loudspeaker of the present invention;

[0023] Figure 2It is a schematic structural diagram of a first embodiment of a diaphragm of the present invention;

[0024] Figure 3 is a schematic structural diagram of a second embodiment of a diaphragm according to the present invention;

[0025] Figure 4 is a schematic structural diagram of a third embodiment of a diaphragm according to the present invention;

[0026] Figure 5 is a schematic structural diagram of a fourth embodiment of a diaphragm according to the present invention;

[0027] Figure 6 is a schematic structural diagram of a fifth embodiment of a diaphragm according to the present invention;

[0028] Figure 7 is a schematic structural diagram of a sixth embodiment of a diaphragm according to the present invention;

[0029] Figure 8 is a schematic structural diagram of a seventh embodiment of a diaphragm according to the present invention;

[0030] Fig. 9 The storage modulus of the comparison sample and the modified sample varies with temperature;

[0031] Fig.10 It is the THD curve performance diagram of the comparison sample and the modified sample;

[0032] Fig.11 It is the HOHD curve performance diagram of the control sample and the modified sample.

[0033] Description of Figure Numbers:

[0034] Label name Label name 100 Diaphragm 200 speaker 10 Thermoreversible covalently cross-linked elastomeric layers 210 Ring part 20 Adhesive layer 220 Ball Top 30 Thermoplastic elastomer layer 230 Voice Coil 40 Plastic substrate layer

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] The present invention provides a diaphragm 100 applied to a loudspeaker 200 .

[0042] See also Figures 1 to 3 In one embodiment of the diaphragm 100 of the present invention, the diaphragm 100 includes at least one layer of thermoreversible covalently cross-linked elastomer layer 10 .

[0043] Here, the number of layers of the thermoreversible covalently cross-linked elastomer layer 10 can be one layer or multiple layers. When it is multiple layers, the multiple layers of thermoreversible covalently cross-linked elastomer layers 10 are stacked. The thermoreversible covalently cross-linked elastomer is an existing material. At the working temperature of the speaker 200, the polymer molecular chains exist in the form of covalent bonds, and there is a cross-linked network structure. Compared with thermoplastic elastomer materials, the existence of the cross-linked network structure makes the material have higher strength, heat resistance, chemical resistance and thermal stability, showing the characteristics of thermosetting elastomers; the covalent cross-linked bonds of the thermoreversible covalently cross-linked elastomer material can be broken at a higher temperature, and linear macromolecules can be regained without destroying the macromolecular chain structure of the polymer material skeleton, thereby realizing the thermoplastic processing of the cross-linked material and showing thermoplasticity. It can be understood that the thermoreversible covalently cross-linked elastomer material has the characteristics of thermosetting materials under working conditions, such as good performance stability, heat resistance, and chemical resistance. When the thermoreversible covalently cross-linked elastomer material is used as a diaphragm 100, it can make the diaphragm 100 have good heat resistance and chemical resistance. At the same time, the thermoreversible covalently cross-linked elastomeric material has the characteristics of being thermoplastic at high temperatures and being easy to process. Using it as the diaphragm 100 of the loudspeaker 200 can effectively reduce its processing cost.

[0044] In addition, since the thermoreversible covalently cross-linked elastomer is an elastomeric material, when used for the diaphragm 100, it can ensure that the diaphragm 100 material has good resilience, meeting the requirements of high performance, high-fidelity sound quality, and high resilience of the speaker 200 product.

[0045] It should be noted that the existing thermoreversible covalently cross-linked elastomers are generally obtained by modifying thermosetting rubber or thermoplastic elastomer and introducing reversible cross-linking bonds, and have good thermoplasticity.

[0046] Therefore, it can be understood that in the technical solution of the present invention, the diaphragm 100 includes at least one layer of thermoreversible covalent cross-linked elastomer layer 10. Here, the diaphragm 100 uses a thermoreversible covalent cross-linked elastomer material, which can show good heat resistance and chemical resistance. At the same time, it also has the characteristics of thermoplasticity at high temperature for easy processing, which can effectively reduce its processing cost, thereby reducing the production cost of the diaphragm 100.

[0047] Optionally, the material of the thermoreversible covalently cross-linked elastomer layer 10 is selected from at least one of a thermoreversible covalently cross-linked polyester elastomer, a thermoreversible covalently cross-linked polyurethane elastomer, a thermoreversible covalently cross-linked silicone elastomer, a thermoreversible covalently cross-linked acrylic rubber elastomer, a thermoreversible covalently cross-linked olefin elastomer, and a thermoreversible covalently cross-linked styrene elastomer.

[0048] These elastomeric materials are all existing materials. When the thermoreversible covalently cross-linked elastomeric layer 10 is selected as the diaphragm 100, the thermoreversible covalently cross-linked elastomeric material may be one or more mixtures of these elastomers, all of which can exhibit good heat resistance and chemical resistance.

[0049] It should be noted that the thermally reversible covalently cross-linked elastomer material can be divided into five types according to the reaction mechanism, namely, acryl ester type, anhydride esterification type, Menxiujin reaction type, isocyanate and active hydrogen reaction type, and Diels-Alder (DA) reaction type. When the thermally reversible covalently cross-linked elastomer layer 10 is selected as the diaphragm 100, its thermally reversible covalently cross-linked elastomer material can be selected from one or more mixtures of these types of elastomers.

[0050] Preferably, the material of the thermoreversible covalently cross-linked elastomer layer 10 is a thermoreversible DA covalently cross-linked elastomer. Here, the thermoreversible covalently cross-linked elastomer material is a thermoreversible DA covalently cross-linked elastomer, which has mild reaction conditions and strong positioning selectivity, and is more suitable for elastomer modification. The prepared polymer material can better match the application of the speaker 200 diaphragm 100 in terms of overall material performance, use temperature, and repeated processing.

[0051] It should be noted that the thermoreversible DA covalent cross-linked elastomer has good thermoplastic processing properties, mainly because dienes and dienophilic groups are introduced into the molecular chain of the matrix polymer. At a specified temperature, the dienes and dienophilic groups undergo Diels-Alder (DA) reaction to produce covalent crosslinks, and this covalent crosslinking bond can undergo a reverse reaction within a higher specific temperature range, making the material thermoplastic processable. The DA reaction system here mainly includes one of the cyclopentadiene system, furan / maleimide system, maleic anhydride derivatives and polyol / amine system.

[0052] Optionally, the elongation at break of the thermoreversible covalently cross-linked elastomer layer 10 is greater than 200%. Here, the elongation at break of the thermoreversible covalently cross-linked elastomer layer 10 should be appropriately controlled to ensure its good performance. Generally, its elongation at break should be greater than 200%. If the elongation at break is lower than 200%, the thermoreversible covalently cross-linked elastomer material will be damaged under long-term high or low temperature vibration, resulting in an increased risk of failure of the diaphragm 100 product.

[0053] Optionally, the thermoreversible decrosslinking temperature of the thermoreversible covalently crosslinked elastomer layer 10 is 80°C to 250°C.

[0054] Here, the thermal reversible de-crosslinking temperature of the thermally reversible covalently crosslinked elastomer layer 10 should be appropriately controlled to ensure its good performance. For example, its thermal reversible de-crosslinking temperature is 80°C, 100°C, 120°C, 150°C, 170°C, 200°C, 220°C or 250°C. If the thermal reversible de-crosslinking temperature of the material is lower than 80°C, the dimensional stability of the product during the use of the material is poor, and the diaphragm 100 of the speaker 200 is prone to deformation after long-term working vibration, resulting in loss of product performance; if the thermal reversible de-crosslinking temperature of the material is higher than 250°C, the thermoplasticity of the material deteriorates, and the processing cost during the preparation of the diaphragm 100 increases.

[0055] Optionally, the thermoreversible covalently cross-linked elastomeric layer 10 has a tensile modulus ranging from 1 MPa to 600 MPa.

[0056] Here, the tensile modulus of the thermoreversible covalently cross-linked elastomer layer 10 should be appropriately controlled to ensure good performance. For example, the tensile modulus can be 1MPa, 25MPa, 50MPa, 100MPa, 150Mpa, 250MPa, 400MPa, 500MPa or 600MPa. Preferably, it is between 3MPa and 300MPa. If the tensile modulus is lower than 1MPa, the stiffness of the material is insufficient, and the diaphragm 100 is prone to polarization and excessive amplitude when the product vibrates, resulting in product distortion. If the tensile modulus is higher than 600MPa, the toughness of the material is insufficient, and the resilience is poor, especially after the diaphragm 100 product has a large displacement, the product will undergo partial irreversible deformation, or due to the high modulus, under the condition of constant input power, it is difficult for the product to achieve the required displacement, thereby affecting the sensitivity and loudness of the product.

[0057] Optionally, the thermoreversible covalently cross-linked elastomer layer 10 has a thickness ranging from 5 μm to 200 μm.

[0058] Here, the thickness of the thermoreversible covalently cross-linked elastomer layer 10 should be appropriately selected, for example, the thickness is controlled to be 5 μm, 15 μm, 30 μm, 50 μm, 100 μm, 150 μm or 200 μm. If the thickness is less than 5 μm, the manufacturing difficulty is relatively large, and if the thickness is greater than 200 μm, the weight of the diaphragm 100 increases, resulting in reduced product sensitivity and reduced product vibration space.

[0059] In one embodiment of the present invention, the thermoreversible covalently cross-linked elastomer layer 10 is provided with at least two layers, and two adjacent thermoreversible covalently cross-linked elastomer layers 10 are connected by heat pressing or by an adhesive layer 20 .

[0060] Here, the diaphragm 100 uses at least two layers of thermoreversible covalently cross-linked elastomer layers 10, which can more effectively improve its heat resistance and chemical resistance. In addition, the two adjacent layers of thermoreversible covalently cross-linked elastomer layers 10 can be connected together by hot pressing, or by using a glue layer 20, and the diaphragm 100 can be obtained. It should be noted that the material and thickness of each layer of thermoreversible covalently cross-linked elastomer layer 10 can be the same or different, and there is no limitation here.

[0061] See also Figure 3 The diaphragm 100 includes two layers of thermoreversible covalently cross-linked elastomer layers 10 , and the two layers of thermoreversible covalently cross-linked elastomer layers 10 are connected by a glue layer 20 , where the glue layer 20 may be a damping glue layer 20 .

[0062] In one embodiment of the present invention, the diaphragm 100 further includes a thermoplastic elastomer layer 30 , the thermoplastic elastomer layer 30 is stacked with at least one thermoplastic elastomer layer 30 , and the thermoplastic elastomer layer 30 is one of the surface layers or the middle layer of the diaphragm 100 .

[0063] Here, the composite structure of the diaphragm 100 contains a thermoplastic elastomer layer 30 and a thermoreversible covalently cross-linked elastomer layer 10, which can ensure that the prepared diaphragm 100 has good resilience and meets the requirements of high performance, high fidelity sound quality and high resilience of the speaker 200 product. The diaphragm 100 has two surface layers and an intermediate layer along its thickness direction. The plastic substrate layer 40 can be the intermediate layer of the composite structure of the diaphragm 100, or it can be one of the surface layers of the composite structure of the diaphragm 100. Here, the "surface layer" refers to the outermost layer of the diaphragm 100, and the "intermediate layer" refers to the layer of the diaphragm 100 located between the two surface layers. The definitions of the "surface layer" and the "intermediate layer" are the same below. It can be understood that when the thermoreversible covalently cross-linked elastomer layer 10 is a layer, the thermoplastic elastomer layer 30 is arranged on one surface of the thermoreversible covalently cross-linked elastomer layer 10, that is, it constitutes the surface layer of the diaphragm 100. When the thermoreversible covalently cross-linked elastomer layer 10 is multi-layered, the thermoplastic elastomer layer 30 can be arranged between two layers of the multi-layer thermoreversible covalently cross-linked elastomer layer 10, that is, the middle layer of the diaphragm 100, and can be arranged on the outer surface of the outermost layer of the multi-layer thermoreversible covalently cross-linked elastomer layer 10, that is, one of the surface layers of the diaphragm 100.

[0064] Optionally, the material of the thermoplastic elastomer layer 30 is selected from at least one of polyester thermoplastic elastomer, polyurethane thermoplastic elastomer, polyamide thermoplastic elastomer, polystyrene thermoplastic elastomer, polyolefin thermoplastic elastomer, and dynamically vulcanized rubber / thermoplastic plastic blend type thermoplastic elastomer. These elastomer materials are all existing materials, and the material of the thermoplastic elastomer layer 30 can be selected from one or more mixtures thereof.

[0065] See also Figure 4In one embodiment of the present invention, the thermoreversible covalently cross-linked elastomer layer 10 is provided with a layer, and the thermoplastic elastomer layer 30 is connected to the thermoreversible covalently cross-linked elastomer layer 10 via a glue layer 20 .

[0066] See also Figure 5 In one embodiment of the present invention, the thermoreversible covalently cross-linked elastomer layer 10 is provided with two layers, and the two layers of thermoreversible covalently cross-linked elastomer layers 10 are respectively provided on the two surfaces of the thermoplastic elastomer layer 30, and the thermoplastic elastomer layer 30 is connected to the thermoreversible covalently cross-linked elastomer layer 10 by heat pressing or by means of the adhesive layer 20. Here, the thermoreversible covalently cross-linked elastomer layer 10 is provided with two layers, which can more effectively improve the heat resistance and chemical resistance of the diaphragm 100.

[0067] In one embodiment of the present invention, the thermoreversible covalently cross-linked elastomer layer 10 is provided with multiple layers, and the thermoplastic elastomer layer 30 is provided with multiple layers, and the multiple thermoreversible covalently cross-linked elastomer layers 10 and the multiple thermoplastic elastomer layers 30 are stacked, and at least one surface layer of the diaphragm 100 is the thermoreversible covalently cross-linked elastomer layer 10, and the two adjacent layers are connected by heat pressing or by a glue layer 20. Here, the thermoreversible covalently cross-linked elastomer layer 10 and the thermoplastic elastomer layer 30 are both multi-layered, which can more effectively improve the heat resistance and chemical resistance of the diaphragm 100, and at the same time, it can more effectively ensure that the diaphragm 100 has good resilience and meets the requirements of high performance, high fidelity sound quality and high resilience of the speaker 200 product.

[0068] In one embodiment of the present invention, the diaphragm 100 further includes a plastic substrate layer 40 , which is one of the surface layers or middle layers of the diaphragm 100 , and the thermoplastic elastomer layer 30 is hot-pressedly connected to the thermoreversible covalently cross-linked elastomer layer 10 or connected via an adhesive layer 20 .

[0069] Here, the composite structure of the diaphragm 100 contains a plastic substrate layer 40, which can ensure that the diaphragm 100 has good toughness and strength, and good stability. The diaphragm 100 has two surface layers and an intermediate layer along its thickness direction. The plastic substrate layer 40 can be the intermediate layer of the composite structure of the diaphragm 100, or it can be one of the surface layers of the composite structure of the diaphragm 100. The plastic substrate layer 40 can be connected to the thermoplastic elastomer layer 30 through the adhesive layer 20, or it can be connected to the plastic elastomer base layer by hot pressing.

[0070] Optionally, the material of the plastic substrate layer 40 is selected from at least one of polyetheretherketone, polyarylate, polyetherimide, polyimide, polyphenylene sulfide, polyethylene naphthalate, and polyethylene terephthalate. These materials are all existing materials, and the material of the plastic substrate layer 40 can be made of one or more of the above materials.

[0071] See also Figure 6In one embodiment of the present invention, the thermoreversible covalently cross-linked elastomer layer 10 is provided with one layer, and the plastic substrate layer 40 is connected to the thermoreversible covalently cross-linked elastomer layer 10 via a glue layer 20. Here, the thermoreversible covalently cross-linked elastomer layer 10 is provided with multiple layers, which can more effectively improve the heat resistance and chemical resistance of the diaphragm 100.

[0072] See also Figure 7 In one embodiment of the present invention, the thermoreversible covalently cross-linked elastomer layer 10 is provided with two layers, and the two thermoreversible covalently cross-linked elastomer layers 10 are respectively provided on the two surfaces of the plastic substrate layer 40, and the plastic substrate layer 40 is connected to the thermoreversible covalently cross-linked elastomer layer 10 by heat pressing or by means of the adhesive layer 20. Here, the thermoreversible covalently cross-linked elastomer layer 10 is provided with two layers, which can more effectively improve the heat resistance and chemical resistance of the diaphragm 100.

[0073] In one embodiment of the present invention, the thermoreversible covalently cross-linked elastomer layer 10 is provided with multiple layers, and the plastic substrate layer 40 is provided with multiple layers. The multiple thermoreversible covalently cross-linked elastomer layers 10 and the multiple plastic substrate layers 40 are stacked, and at least one surface layer of the diaphragm 100 is the thermoreversible covalently cross-linked elastomer layer 10, and the two adjacent layers are connected or hot-pressed by the adhesive layer 20. Here, the thermoreversible covalently cross-linked elastomer layer 10 and the plastic substrate layer 40 are both multi-layered, which can more effectively improve the heat resistance and chemical resistance of the diaphragm 100, and at the same time, it can more effectively ensure that the diaphragm 100 has good toughness and strength, and good stability.

[0074] See also Figure 8 In some embodiments of the present invention, the diaphragm 100 also includes a thermoplastic elastomer layer 30 and a plastic substrate layer 40. The thermoplastic elastomer layer 30, the plastic substrate layer 40 and the thermoreversible covalently cross-linked elastomer layer 10 are hot-pressed connected or connected through an adhesive layer 20, and at least one surface layer of the diaphragm 100 is the thermoreversible covalently cross-linked elastomer layer 10.

[0075] Here, the diaphragm 100 is a composite layer structure of a thermoreversible covalently cross-linked elastomer layer 10, a thermoplastic elastomer layer 30 and a plastic substrate layer 40, wherein the number of layers of the thermoreversible covalently cross-linked elastomer layer 10, the thermoplastic elastomer layer 30 and the plastic substrate layer 40 can be one or more layers. Two adjacent layers can be connected by a glue layer 20 or by hot pressing. In addition, at least one surface layer of the diaphragm 100 is a thermoreversible covalently cross-linked elastomer layer 10, so that the diaphragm 100 has good heat resistance, chemical resistance, toughness, strength, stability and high resilience, meeting the requirements of high performance, high fidelity sound quality and high resilience of the speaker 200 product.

[0076] Please refer again Figure 1The present invention also provides a speaker 200, which includes a dome 220, a folding ring 210 and a voice coil 230. The folding ring 210 is arranged at the edge of the speaker 200, the dome 220 is connected to one side of the folding ring 210, and the voice coil 230 is connected to the other side of the folding ring 210. The dome 220 and / or the folding ring 210 are the diaphragm 100 as described above, and the specific structure of the diaphragm 100 refers to the above-mentioned embodiment. Since the speaker 200 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0077] Specifically, the ball top portion 220 is located at the center of the speaker 200, and the folding ring portion 210 is located at the edge of the speaker 200. The ball top portion 220 is generally glued to one side of the folding ring portion 210, and the other side of the folding ring portion 210 is connected to the voice coil 230 of the speaker 200. Here, the folding ring portion 210 and the ball top portion 220 both adopt the diaphragm 100 structure of the present invention, which can improve the heat resistance and chemical resistance of the speaker 200, thereby extending the service life of the speaker 200.

[0078] Optionally, the thermoreversible covalently cross-linked elastomer layer 10 of the diaphragm 100 is disposed toward the voice coil 230. Here, the thermoreversible covalently cross-linked elastomer layer 10 of the diaphragm 100 is disposed toward the voice coil 230, which can more effectively improve the heat resistance and chemical resistance of the loudspeaker 200, thereby more effectively extending the service life of the loudspeaker 200.

[0079] The diaphragm of the present invention is described in detail below through specific embodiments.

[0080] Comparative Example

[0081] A thermoplastic polyurethane elastomer material with a hardness of about 90A is used as a diaphragm, which is recorded as a comparison sample.

[0082] Example

[0083] The present invention improves the thermoplastic polyurethane elastomer material sample in the comparative example, that is, a diene and diene-philic functional group capable of undergoing DA reaction is introduced into the sample molecular chain to obtain a thermoplastic reversible covalently cross-linked elastomer material, which is recorded as a modified sample.

[0084] The temperature of the control sample and the modified sample was scanned by dynamic thermomechanical analyzer (DMA) to obtain the change curve of storage modulus with temperature. Fig. 9 shown.

[0085] As can be seen from the figure, the modulus change rate of the thermoreversibly modified elastomeric material of the present invention from low temperature to high temperature decreases, indicating that due to the presence of covalent cross-linking bonds, the thermal mobility of the chain segments is reduced and the influence of temperature on the chain segments is reduced, thereby achieving relatively stable mechanical properties of the diaphragm material over a wider temperature range.

[0086] Furthermore, the total harmonic distortion of the control sample and the modified sample at different voltages was tested to obtain the total harmonic distortion (THD) curve, that is, the result produced by the distortion. Fig.10 The percentage of the effective value of the total harmonic sound pressure to the average characteristic sound pressure indicates the magnitude of the distortion.

[0087] As can be seen from the figure, the cross-linked modified sample has a lower THD at the same voltage, and as the test voltage increases from 2.37V to 4.0V, the increase in THD200-300Hz, the distortion of the modified sample increases less (THD of the control sample increases from 21% to about 42%, while THD of the modified sample increases from about 20% to about 36%). It can be understood that the thermoreversibly modified elastomer material has a significantly improved listening yield of speaker products due to its relatively stable mechanical properties. In particular, the listening yield under high power is improved. This is because under high power, the suspension system of the speaker needs to produce a large displacement, and the temperature near the voice coil increases. The less the mechanical properties of the speaker diaphragm fold are affected by temperature, the better the vibration stability of the vibration system will be, and the less likely it will produce defects such as polarization, thereby effectively reducing the problem of increased distortion caused by large displacement of the product.

[0088] At the same time, the high-order harmonic distortion of the comparison sample and the modified sample was tested to obtain the high-order harmonic distortion (HOHD) curve. The solid line is the test voltage of 2.83V, and the dotted line is the test voltage of 4.0V. It can be used to reflect whether the speaker has noise. The results are shown in Fig.11 shown.

[0089] As can be seen from the figure, the modified sample has lower distortion, and the distortion does not change much with the increase of the test voltage. From this, it can be inferred that the acoustic performance of the cross-linked modified sample is more stable under different voltages or input signals, and has a higher listening yield.

[0090] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A diaphragm, applied to a loudspeaker, characterized in that: The diaphragm comprises at least one layer of thermoreversible covalently cross-linked elastomer; Among them, the material of the thermoreversible covalently cross-linked elastomer layer is the thermoreversible DA covalently cross-linked elastomer; the tensile modulus of the thermoreversible covalently cross-linked elastomer layer ranges from 1MPa to 600MPa; the thickness of the thermoreversible covalently cross-linked elastomer layer ranges from 5μm to 200μm.

2. The diaphragm according to claim 1, characterized in that The material of the thermally reversible covalently cross-linked elastomer layer is selected from at least one of a thermally reversible covalently cross-linked polyester elastomer, a thermally reversible covalently cross-linked polyurethane elastomer, a thermally reversible covalently cross-linked silicone elastomer, a thermally reversible covalently cross-linked acrylic rubber elastomer, a thermally reversible covalently cross-linked olefin elastomer, and a thermally reversible covalently cross-linked styrene elastomer.

3. The diaphragm according to claim 1, characterized in that The elongation at break of the thermoreversible covalently cross-linked elastomer layer is greater than 200%; and / or, The thermoreversible decrosslinking temperature of the thermoreversible covalently crosslinked elastomer layer is 80°C to 250°C.

4. The diaphragm according to any one of claims 1 to 3, characterized in that: The thermoreversible covalently cross-linked elastomer layer is provided with at least two layers, and two adjacent thermoreversible covalently cross-linked elastomer layers are connected by heat pressing or by a glue layer.

5. The diaphragm according to any one of claims 1 to 3, characterized in that: The diaphragm further comprises a thermoplastic elastomer layer, which is one of the surface layers or the middle layer of the diaphragm, and the thermoplastic elastomer layer is connected to the thermoreversible covalently cross-linked elastomer layer by heat pressing or by a glue layer.

6. The diaphragm according to claim 5, characterized in that The material of the thermoplastic elastomer layer is selected from at least one of polyester thermoplastic elastomer, polyurethane thermoplastic elastomer, polyamide thermoplastic elastomer, polystyrene thermoplastic elastomer, polyolefin thermoplastic elastomer, and dynamically vulcanized rubber / thermoplastic plastic blend type thermoplastic elastomer.

7. The diaphragm according to claim 5, characterized in that The thermoreversible covalently cross-linked elastomer layer is provided with a layer, and the thermoplastic elastomer layer is connected to the thermoreversible covalently cross-linked elastomer layer by heat pressing or by a glue layer; or, The thermoreversible covalently cross-linked elastomer layer is provided with two layers, and the two layers of the thermoreversible covalently cross-linked elastomer layer are respectively provided on the two surfaces of the thermoplastic elastomer layer, and the thermoplastic elastomer layer is connected to the thermoreversible covalently cross-linked elastomer layer by heat pressing or by a glue layer; or, The thermoreversible covalently cross-linked elastomer layer is provided with multiple layers, and the thermoplastic elastomer layer is provided with multiple layers. The multiple layers of the thermoreversible covalently cross-linked elastomer layer and the multiple layers of the thermoplastic elastomer layer are stacked, and at least one surface layer of the diaphragm is a thermoreversible covalently cross-linked elastomer layer, and two adjacent layers are connected by an adhesive layer or hot pressing.

8. The diaphragm according to any one of claims 1 to 3, characterized in that: The diaphragm further comprises a plastic substrate layer, which is one of the surface layers or middle layers of the diaphragm, and the plastic substrate layer is connected to the thermoreversible covalently cross-linked elastomer layer by heat pressing or by a glue layer.

9. The diaphragm according to claim 8, characterized in that: The material of the plastic substrate layer is selected from at least one of polyetheretherketone, polyarylate, polyetherimide, polyimide, polyphenylene sulfide, polyethylene naphthalate, and polyethylene terephthalate.

10. The diaphragm according to claim 8, characterized in that The thermoreversible covalently cross-linked elastomer layer is provided with a layer, and the plastic substrate layer is connected to the thermoreversible covalently cross-linked elastomer layer by heat pressing or by a glue layer; or, The thermoreversible covalently cross-linked elastomer layer is provided with two layers, the two thermoreversible covalently cross-linked elastomer layers are respectively provided on two surfaces of the plastic substrate layer, and the plastic substrate layer is connected to the thermoreversible covalently cross-linked elastomer layer by heat pressing or by a glue layer; or, The thermoreversible covalently cross-linked elastomer layer is provided with multiple layers, and the plastic substrate layer is provided with multiple layers. The multiple layers of the thermoreversible covalently cross-linked elastomer layer and the multiple layers of the plastic substrate layer are stacked, and at least one surface layer of the diaphragm is a thermoreversible covalently cross-linked elastomer layer, and two adjacent layers are connected by an adhesive layer or hot pressing.

11. The diaphragm according to any one of claims 1 to 3, characterized in that: The diaphragm also includes a thermoplastic elastomer layer and a plastic substrate layer. The thermoplastic elastomer layer, the plastic substrate layer and the thermoreversible covalently cross-linked elastomer layer are connected by hot pressing or by a glue layer, and at least one surface layer of the diaphragm is the thermoreversible covalently cross-linked elastomer layer.

12. A loudspeaker, characterized in that: The speaker includes a ball top, a folding ring and a voice coil, wherein the folding ring is arranged at the edge of the speaker, the ball top is connected to one side of the folding ring, and the voice coil is connected to the other side of the folding ring, and the ball top and / or the folding ring is a diaphragm as described in any one of claims 1 to 11.

13. The loudspeaker according to claim 12, characterized in that The thermoreversible covalently cross-linked elastomer layer of the diaphragm is disposed toward the voice coil.

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