Vibrating diaphragm assembly, sound production device and electronic equipment

Abstract

The invention discloses a vibrating diaphragm assembly, a sound production device and electronic equipment. The vibrating diaphragm assembly comprises a ball top part located in the center position and a folding ring part arranged on the outer side of the ball top part in the circumferential direction, the ball top part and the folding ring part at least comprise one crosslinkable high polymer material layer of the same type, the thickness of the ball top part is larger than that of the folding ring part, the crosslinking degree of the ball top part is 50%-100%, and the thickness of the folding ring part is larger than that of the ball top part. And the crosslinking degree of the folding ring part is 0-20%. By controlling different crosslinking degrees of the ball top part and the folding ring part, the requirements of high rigidity of the ball top part and high flexibility of the folding ring part are met. The rigidity of the ball top is high, segmentation vibration is not prone to occurring in the high-frequency vibration process, and high-frequency response is good. The cross-linkable high polymer material layer of the folding ring part does not generate cross-linking or low-degree cross-linking, so that the high polymer material can keep flexibility, and the folding ring part is small in Young modulus and good in low-frequency response.

Description

Technical Field

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

[0002] In the related art, the diaphragm assembly of the speaker includes a folding ring and a dome located at the center of the folding ring. The folding ring is mainly made of materials such as engineering plastics or elastomers, and the dome is made of a relatively rigid material, such as aluminum foil, carbon fiber material, etc. The two are assembled together by gluing. The diaphragm assembly has poor integrity, and there is a problem of soft-hard connection between the folding ring and the dome, and the bonding force of the glue is extremely high. During high-frequency vibration, the folding ring and the dome are easily separated, resulting in poor reliability of the diaphragm assembly.

[0003] To solve the above problems, a solution is proposed in the related art to integrally form the folding ring and the dome with plastic material. However, the folding ring and the dome of the diaphragm assembly have the same thickness, so that the diaphragm assembly cannot have good high-frequency and low-frequency performance. Summary of the invention

[0004] An object of the present invention is to provide a new technical solution for a diaphragm assembly.

[0005] According to a first aspect of the present invention, a diaphragm assembly is provided. The diaphragm assembly comprises a ball top portion located at a central position and a folding ring portion arranged on the circumferential outer side of the ball top portion, the ball top portion and the folding ring portion contain at least one layer of the same type of cross-linkable polymer material layer, wherein the thickness of the ball top portion is greater than the thickness of the folding ring portion, the cross-linking degree of the ball top portion is 50%-100%, and the cross-linking degree of the folding ring portion is 0-20%.

[0006] Optionally, the thickness of the top of the ball is 10 μm-300 μm, and the thickness of the folding ring is 3 μm-100 μm.

[0007] Optionally, the Young's modulus of the top of the ball is greater than the Young's modulus of the folded ring portion.

[0008] Optionally, the Young's modulus of the top of the ball is 0.5 GPa-20 GPa, and the Young's modulus of the folding ring is 0.05 GPa-7 GPa.

[0009] Optionally, the elongation at break of the folding ring portion is 50%-1000%;

[0010] And / or, the thermal deformation temperature of the top of the ball is greater than or equal to 80°C.

[0011] Optionally, the material of the cross-linkable polymer material layer includes at least one of polyimide, polyarylethernitrile, phenolic resin, epoxy resin, polyurethane resin, thermosetting acrylic resin, polyvinyl chloride, and rubber.

[0012] Optionally, the ball top portion and the folded ring portion further contain at least one layer of thermoplastic polymer material stacked with the cross-linkable polymer material.

[0013] Optionally, the material of the thermoplastic polymer material layer includes at least one of PET, PEN, PEEK, TPEE, and TPU.

[0014] Optionally, the ratio of the thickness of the cross-linkable polymer material layer to the thickness of the thermoplastic polymer material layer is 0.1-5.

[0015] Optionally, the ball top portion further includes a foam layer, and the cross-linkable polymer material layer is bonded to the foam layer by means of an adhesive film or by means of thermal cross-linking.

[0016] Optionally, the folding ring portion is circular, rectangular or track-shaped, and the top portion of the ball is flat, dome-shaped or forms a reinforcing rib structure.

[0017] Optionally, the cross-linkable polymer material layer is cross-linked and formed by at least one of heating cross-linking, radiation cross-linking, moisture cross-linking and room temperature cross-linking.

[0018] According to another aspect of the present invention, a sound-generating device is provided. The device includes a vibration system and a magnetic circuit system matched with the vibration system, the vibration system includes a voice coil and the diaphragm assembly of the present invention, the diaphragm assembly is arranged on one side of the voice coil, and the magnetic circuit system can drive the voice coil to vibrate so as to drive the diaphragm assembly to generate sound.

[0019] According to another aspect of the present invention, an electronic device is provided, which includes the sound generating device of the present invention.

[0020] In an embodiment of the present invention, the different cross-linking degrees of the ball top and the folding ring are controlled to meet the high rigidity of the ball top and the high flexibility of the folding ring. The cross-linking degree of the ball top is 50%-100%, so that the rigidity of the ball top is high, split vibration is not easy to occur during high-frequency vibration, and the high-frequency response is good. The cross-linking degree of the folding ring is 0-20%, that is, the cross-linkable polymer material layer of the folding ring is not cross-linked or is cross-linked to a low degree, so that the polymer material can maintain flexibility, the Young's modulus of the folding ring is small, and the low-frequency response is good. Moreover, the folding ring and the ball top are integrally formed without bonding, the production process is simple, the consistency of the diaphragm assembly is good, and the high-frequency and low-frequency sound effects can be taken into account, thereby improving the acoustic performance of the diaphragm assembly.

[0021] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0023] Figure 1 is a cross-sectional view of a diaphragm assembly according to an embodiment of the present invention.

[0024] Figure 2 is a cross-sectional view of another diaphragm assembly according to an embodiment of the present invention.

[0025] Figure 3 is a cross-sectional view of a sound generating device according to an embodiment of the present invention.

[0026] Figure 4 1 is the frequency response curve of the embodiment of the present invention and the comparative example.

[0027] Description of reference numerals:

[0028] 100, diaphragm assembly; 110, folding ring; 120, dome; 130, voice coil; 140, foam layer; 150, cross-linkable polymer material layer;

[0029] 210, center magnet; 211, side washer; 220, side magnet; 221, center washer; 230, magnetic yoke. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that 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 invention unless otherwise specifically stated.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0033] 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.

[0034] 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.

[0035] The present invention provides a diaphragm assembly 100. The diaphragm assembly 100 comprises a ball top portion 120 located at a central position and a folding ring portion 110 arranged on the circumferential outer side of the ball top portion 120, wherein the ball top portion 120 and the folding ring portion 110 contain at least one layer of a cross-linkable polymer material layer 150 of the same type, wherein the thickness of the ball top portion 120 is greater than the thickness of the folding ring portion 110, the cross-linking degree of the ball top portion 120 is 50%-100%, and the cross-linking degree of the folding ring portion 110 is 0-20%.

[0036] Specifically, the diaphragm assembly 100 is rectangular, circular, etc. The center position of the diaphragm assembly 100 is the ball top 120. The folding ring portion 110 is arranged around the circumference of the ball top 120, and the inner fixing portion inside the folding ring portion 110 is connected to the ball top 120. The outer fixing portion outside the folding ring portion 110 is used to connect with the edge washer 211 or the shell of the sound-emitting device. The folding ring portion 110 can be provided with one folding ring, or multiple folding rings can be arranged in sequence from the inside to the outside. Optionally, the folding ring portion 110 is circular, rectangular or runway-shaped. The ball top 120 is flat, dome-shaped or forms a reinforcing rib structure. The ball top 120 and the folding ring portion 110 contain at least one layer of the same type of cross-linkable polymer material layer 150, that is, the ball top 120 and the folding ring portion 110 can be a single-layer structure or a multi-layer structure. When it is a single-layer structure, the ball top portion 120 and the ring fold portion 110 are made of a layer of the same type of cross-linkable polymer material layer 150. When it is a multi-layer structure, at least one layer of the ball top portion 120 and the ring fold portion 110 is made of the same type of cross-linkable polymer material layer 150. Of course, it is also possible that one of the ball top portion 120 and the ring fold portion 110 is a single-layer structure and the other is a multi-layer structure, and one layer of the single-layer structure and the multi-layer structure is made of the same type of cross-linkable polymer material layer 150. During the preparation process, the ball top portion 120 and the ring fold portion 110 are connected together, thereby saving the step of connecting the ball top portion 120 and the ring fold portion 110, and eliminating the adhesive between the ball top portion and the ring fold portion.

[0037] The cross-linkable polymer material layer 150 is prepared from a cross-linkable polymer material. The cross-linkable polymer material layer refers to a polymer material that can undergo a cross-linking reaction to form a three-dimensional network structure. The cross-linking type of the cross-linkable polymer material layer 150 is a reactive cross-linking type or a self-cross-linking type. The material of the cross-linkable polymer material layer 150 includes at least one of polyimide, polyarylether nitrile, phenolic resin, epoxy resin, polyurethane resin, thermosetting acrylic resin, polyvinyl chloride, and rubber. The above polymer materials can undergo a cross-linking reaction to form a polymer material with a three-dimensional network structure. Among them, the self-cross-linkable polymer material layer 150 includes a polyimide with cross-linking activity (for example, a phenylethene-terminated side-group cross-linked polyimide prepolymer), or a diamine compound is added later to cross-link the polyimide main chain through chemical initiation or photoinitiation. The self-cross-linkable polymer material layer 150 can also be a polyurethane, for example, by adjusting the polyol functional group to undergo a cross-linking reaction, wherein the number of the polyfunctional groups is greater than or equal to 3.

[0038] Optionally, the cross-linkable polymer material layer 150 is cross-linked and formed by at least one of heating cross-linking, radiation cross-linking, moisture cross-linking, room temperature cross-linking, and chemical cross-linking. Heating cross-linking refers to a cross-linking method in which free radicals, double bonds, or other cross-linking groups in the cross-linkable polymer material layer 150 undergo a cross-linking reaction by heating to form chemical bonds, thereby cross-linking the polymer segments to form a three-dimensional network structure. Optionally, the temperature of heating cross-linking is 50°C-180°C. Radiation cross-linking refers to a cross-linking method in which high-energy rays (e.g., electron beams, gamma rays, neutron beams, particle beams, ultraviolet rays, etc.) or high-speed electrons are used as radiation sources to act on the cross-linkable polymer material layer 150, so that chemical bonds or strong physical bonding points are formed between the molecular chains to form a three-dimensional network structure. Moisture cross-linking curing refers to the reaction of components such as isocyanates and silanes in the cross-linkable polymer material layer with the air to generate active groups, which undergo cross-linking reactions with reactive groups in the main body. Room temperature crosslinking refers to a crosslinking reaction of the crosslinkable polymer material layer 150 at room temperature through a specific crosslinking system (e.g., a single-component room temperature self-crosslinking system, a two-component room temperature self-crosslinking system, etc.) to form a three-dimensional network structure. Chemical crosslinking refers to a crosslinking method in which monomers and crosslinking agents are connected through the action of a crosslinking agent under the action of an initiating system to form a body structure. The above crosslinking methods can cause the crosslinkable polymer material layer 150 to undergo a crosslinking reaction, and the degree of crosslinking of the crosslinkable polymer material layer 150 can be adjusted by controlling the conditions of the crosslinking reaction.

[0039] Among them, the cross-linkable polymer material layer can be polyvinyl chloride, and polyvinyl chloride can be cross-linked by radiation. The auxiliary cross-linking agent used in polyvinyl chloride is a monomer containing two or more carbon-carbon double bond structures, for example, diethylene glycol acrylate, tetraethylene glycol diacrylate, trimethylolpropane, tripropyl acrylate, etc. Polyvinyl chloride can also be cross-linked chemically. Chemical cross-linking is mainly initiated by peroxide initiation system, mercapto-s-triazine cross-linking system, organosilane cross-linking system, etc. to initiate cross-linking of polyvinyl chloride. Acrylic resin can be cross-linked chemically, for example, the cross-linking agent includes melamine, epoxy resin, polyurethane, etc. Epoxy resin can be cross-linked chemically. For example, the cross-linking agent includes aliphatic polyamines, alicyclic polyamines, acid glycoside cross-linking agents, polyamide cross-linking agents, etc. Of course, the amount of the cross-linking agent, the timing of addition, etc., can be set by those skilled in the art according to actual needs, and are not limited here.

[0040] In the embodiment of the present invention, the different cross-linking degrees of the ball top 120 and the folding ring 110 are controlled to meet the high rigidity of the ball top 120 and the high flexibility of the folding ring 110. The cross-linking degree of the ball top 120 is 50%-100%, so that the rigidity of the ball top 120 is high, split vibration is not easy to occur during high-frequency vibration, and the high-frequency response is good. The cross-linking degree of the folding ring 110 is 0-20%, that is, the cross-linkable polymer material layer 150 of the folding ring 110 is not cross-linked or is cross-linked to a low degree, so that the polymer material can maintain flexibility, the Young's modulus of the folding ring 110 is small, and the low-frequency response is good. Moreover, the folding ring 120 and the ball top 110 are integrally formed without bonding, the production process is simple, the consistency of the diaphragm assembly is good, and the high-frequency and low-frequency sound effects can be taken into account, thereby improving the acoustic performance of the diaphragm assembly.

[0041] In a specific embodiment of the present invention, the thickness of the ball top portion 120 is 10 μm-300 μm, and the thickness of the folding ring portion 110 is 3 μm-100 μm.

[0042] It can be understood that the greater the thickness of the ball top 120, the greater the rigidity of the ball top 120; conversely, the smaller the rigidity. When the thickness of the ball top 120 is less than 10μm, the rigidity of the ball top 120 is too small to meet the sound requirements; when the thickness of the ball top 120 is greater than 300μm, the thickness of the ball top 120 is too large, resulting in the vibration space of the diaphragm assembly 100 being too small, affecting the sound effect. When the thickness of the ball top 120 is 10μm-300μm, the ball top 120 has sufficient rigidity and does not make the vibration space of the diaphragm assembly 100 too small. Optionally, the thickness of the ball top 120 is 10μm, 50μm, 100μm, 150μm, 200μm, 240μm, 270μm, 300μm, etc. The above values ​​all make the ball top 120 have sufficient rigidity and do not make the vibration space of the diaphragm assembly 100 too small.

[0043] In addition, when the thickness of the folding ring portion 110 is less than 3μm, the strength of the folding ring portion 110 is too low, and the membrane is prone to breakage during vibration. When the thickness of the folding ring portion 110 is greater than 100μm, the resonant frequency of the sound-emitting device using the diaphragm assembly 100 is too high, and the low-frequency response is poor. When the thickness of the folding ring portion 110 is 3μm-100μm, the folding ring portion 110 has sufficient strength, and the resonant frequency of the sound-emitting device is low, and the low-frequency response is good. Optionally, the thickness of the folding ring portion 110 is 3μm, 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, etc., and the above values ​​all make the folding ring portion 110 have sufficient strength, and the resonant frequency of the sound-emitting device is low, and the low-frequency response is good.

[0044] Optionally, the thickness of the ball top portion 120 is greater than or equal to 1.5 times the thickness of the rim portion 110. Within this range, the rigidity of the ball top portion 120 is sufficiently large, and the compliance of the rim portion 110 is good.

[0045] In a specific embodiment of the present invention, the Young's modulus of the spherical top portion 120 is greater than the Young's modulus of the folded ring portion 110 .

[0046] It should be noted that the greater the Young's modulus of the rim 110, the worse the low-frequency effect, so the rim 110 should maintain a smaller Young's modulus. If the Young's modulus of the ball top 120 is too small, split vibration is likely to occur during high-frequency vibration, so the ball top 120 should maintain a larger Young's modulus.

[0047] In this embodiment, the Young's modulus of the ball top 120 is greater than that of the folding ring 110, so that the ball top 120 has greater rigidity, is less likely to experience separation vibration, and has better high-frequency response; and the Young's modulus of the folding ring 110 is smaller, and has better low-frequency response.

[0048] In a specific embodiment of the present invention, the Young's modulus of the ball top portion 120 is 0.5 GPa-20 GPa, and the Young's modulus of the folding ring portion 110 is 0.05 GPa-7 GPa.

[0049] It should be noted that if the Young's modulus of the dome 120 is too small, the rigidity of the dome 120 is poor, the dome 120 is prone to split vibration, and the high-frequency response of the sound-generating device is poor. If the Young's modulus of the dome 120 is too large, the strength of the dome is greater at the same thickness, and the processing and molding of the dome 120 is difficult.

[0050] When the Young's modulus of the ball top portion 120 is 0.5 GPa-20 GPa, the ball top portion 120 has sufficient rigidity and is easy to process. Optionally, the Young's modulus of the ball top portion 120 is 0.5 GPa, 1 GPa, 2 GPa, 4 GPa, 6 GPa, 8 GPa, 10 GPa, 12 GPa, 14 GPa, 16 GPa, 17 GPa, 19 GPa, 20 GPa, etc. The above values ​​make the ball top portion 120 have sufficient rigidity and be easy to process.

[0051] In addition, it can be understood that if the Young's modulus of the folding ring portion 110 is larger, the rigidity is greater, the vibration is more difficult, it is difficult to achieve a large amplitude, and the loudness is poor; on the contrary, if the Young's modulus of the folding ring portion 110 is too small, the rigidity of the folding ring portion 110 is too low, and the film is prone to breakage during the molding and vibration process. In addition, under the same resonant frequency F0 condition, the smaller the modulus of the folding ring portion 110, the greater the thickness of the folding ring portion 110 is required. Affected by the vibration space of the sound-generating device, the thickness of the folding ring portion 110 should not be too large. When the Young's modulus of the folding ring portion 110 is 0.05GPa-7GPa, the folding ring portion 110 has both sufficient rigidity and a large amplitude, and a small thickness. Optionally, the Young's modulus of the folding ring portion 110 is 0.05 GPa, 0.5 GPa, 0.8 GPa, 1 GPa, 1.2 GPa, 2 GPa, 3 GPa, 4 GPa, 5 GPa, 6 GPa, 7 GPa, etc. The above values ​​enable the folding ring portion 110 to have sufficient rigidity and a large amplitude with a small thickness.

[0052] In a specific embodiment of the present invention, the elongation at break of the folding ring portion 110 is 50%-1000%;

[0053] And / or, the heat deformation temperature of the ball top portion 120 is greater than or equal to 80°C.

[0054] It should be noted that, during operation, the folding ring portion 110 is continuously stretched up and down. If the elongation at break of the folding ring portion 110 is too small, it is easy to break when working at a large amplitude or for a long time; in addition, the folding ring portion 110 is usually processed into a convex shape and cut with a surface-attached pattern. If the elongation at break of the folding ring portion 110 is too small, it is easy to cause the convexity or pattern to be not formed in place, and the material is easy to break during the forming process. In addition, the elongation at break of the folding ring portion 110 is usually inversely proportional to its Young's modulus. The larger the elongation at break, the smaller the Young's modulus of the folding ring portion 110. When the elongation at break of the folding ring portion 110 is 50%-1000%, it can not only prevent the folding ring portion 110 from breaking when working at a large amplitude, for a long time, or during forming, but also make the Young's modulus of the folding ring portion 110 moderate. Optionally, the elongation at break of the folding ring portion 110 is 50%, 100%, 200%, 300%, 400%, 500%, 600%, 700%, 800%, 900%, 1000%, etc. The above values ​​can prevent the folding ring portion 110 from breaking when working with large amplitude, for a long time, or during molding, and can also make the Young's modulus of the folding ring portion 110 moderate.

[0055] The ball top 120 is usually bonded to the voice coil 130 by glue. During operation, the heat generated by the voice coil 130 is directly conducted to the ball top 120. If the heat deformation temperature of the ball top 120 is too low, the ball top 120 is prone to deformation during the operation of the sound-generating device. The ball top 120 of the embodiment of the present invention is cross-linked and formed by the cross-linkable polymer material layer 150, and a body polymer structure has been formed. The movement of the molecular chain segments is difficult, so that the heat deformation temperature of the ball top 120 is ≥80°C. Within this range, the ball top 120 is not easily deformed during the operation of the sound-generating device.

[0056] In a specific embodiment of the present invention, the ball top portion 120 and the folding ring portion 110 further include at least one layer of thermoplastic polymer material layer stacked with the cross-linkable polymer material layer 150 .

[0057] In this embodiment, the diaphragm assembly 100 is a composite material, including a multi-layer structure. For example, a layer of cross-linkable polymer material layer 150 and a layer of thermoplastic polymer material layer are composited to form a multi-layer structure, or a layer of thermoplastic polymer material layer is disposed between two layers of cross-linkable polymer material layers 150 to form a multi-layer structure; or a layer of cross-linkable polymer material layer 150 is disposed between two layers of thermoplastic polymer material layers. The thermoplastic polymer material layer of the folding ring 110 and the thermoplastic polymer material layer of the ball top 120 may be the same or different. The composite of the thermoplastic polymer material layer and the cross-linkable polymer material layer 150 can significantly improve the damping performance of the diaphragm assembly 100.

[0058] In a specific embodiment of the present invention, the material of the thermoplastic polymer material layer includes at least one of PET, PEN, PEEK, TPEE, and TPU.

[0059] In this embodiment, one or more of the above thermoplastic polymer material layers can be used to compound with the cross-linkable polymer material layer 150. By compounding the cross-linkable polymer material layer 150 with the thermoplastic polymer material layer, the high-frequency and low-frequency performances and reliability of the diaphragm assembly 100 can be improved.

[0060] For example, the cross-linkable polymer material layer 150 is epoxy resin. The thermoplastic polymer material layer is TPEE and / or TPU. Epoxy resin has high rigidity and good high-frequency performance; TPEE and / or TPU have a small Young's modulus, good rebound performance, and good low-frequency performance. The combination of the two can make the diaphragm assembly 100 have both high rigidity and rebound performance, broadening the sound frequency band of the sound-generating device using the diaphragm assembly 100. When cross-linking, the longer the cross-linking time of the ball top 120, the easier it is to form a mesh interpenetrating structure, improve the cross-linking degree, and increase the rigidity of the ball top 120. The folding ring part 110 is not cross-linked or slightly cross-linked, and it only needs to ensure that it can be shaped, so as to reduce the degree of cross-linking and ensure the elasticity of the folding ring part 110, so that the low-frequency curve of the diaphragm assembly 100 is smoother. In addition, the overall structural strength of the composite material is high, so that the reliability of the diaphragm assembly 100 is high.

[0061] For another example, the cross-linkable polymer material layer 150 is a polyurethane resin. The thermoplastic polymer material layer is PET and / or PEN. Polyurethane resin has high elasticity and good low-frequency effect. PET and / or PEN have high rigidity, resulting in a high resonance frequency and poor low-frequency response of the diaphragm assembly 100. The combination of the two can broaden the sound frequency band of the sound-emitting device using the diaphragm assembly 100. In addition, the overall structural strength of the composite material is high, which makes the diaphragm assembly 100 highly reliable.

[0062] In a specific embodiment of the present invention, the ratio of the thickness of the cross-linkable polymer material layer 150 to the thickness of the thermoplastic polymer material layer is 0.1-5.

[0063] It should be noted that when the ratio of the thickness of the cross-linkable polymer material layer 150 to the thickness of the thermoplastic polymer material layer is less than 0.1, the modification effect of the cross-linkable polymer material layer 150 on the thermoplastic polymer material layer is small; when the ratio of the thickness of the cross-linkable polymer material layer 150 to the thickness of the thermoplastic polymer material layer is greater than 5, the role of the thermoplastic polymer material layer in the diaphragm assembly 100 is small. When the ratio of the thickness of the cross-linkable polymer material layer 150 to the thickness of the thermoplastic polymer material layer is 0.1-5, the diaphragm assembly 100 can have the advantages of both the cross-linkable polymer material layer 150 and the thermoplastic polymer material layer. Optionally, the ratio of the thickness of the cross-linkable polymer material layer 150 to the thickness of the thermoplastic polymer material layer is 0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc., and the above values ​​enable the diaphragm assembly 100 to have the advantages of both the cross-linkable polymer material layer 150 and the thermoplastic polymer material layer. Further, the ratio of the thickness of the cross-linkable polymer material layer 150 to the thickness of the thermoplastic polymer material layer is 0.2-2.

[0064] In a specific embodiment of the present invention, the ball top portion 120 further includes a foam layer 140 , and the cross-linkable polymer material layer 150 is bonded to the foam layer 140 by adhesive film or by thermal cross-linking.

[0065] In this embodiment, the foam layer 140 is located between the cross-linkable polymer material layer 150, or between the cross-linkable polymer and the thermoplastic polymer material layer, thereby forming a sandwich structure. The foam layer 140 is polymethacrylimide foam, polyethylene terephthalate foam, polyimide foam, polyetherimide foam, aerogel, etc. The foam layer 140 and the cross-linkable polymer material layer 150 are stacked, for example, the foam layer 140 and the cross-linkable polymer material layer 150 are bonded by an adhesive film, or the cross-linkable polymer material layer 150 is bonded to the foam layer 140 during the cross-linking process of the cross-linkable polymer material layer 150 by thermal cross-linking. The foam layer 140 is a foam material, which can effectively reduce the density of the ball top 120, thereby reducing the weight of the ball top 120 and improving the mid-frequency sensitivity of the diaphragm assembly 100. In addition, the foam layer 140 can significantly improve the rigidity of the dome portion 120 and prevent the dome portion 120 from splitting vibration, thereby making the diaphragm assembly 100 have a good high-frequency response.

[0066] Another embodiment of the present invention provides a sound-generating device. The sound-generating device includes a vibration system and a magnetic circuit system matched with the vibration system, wherein the vibration system includes a voice coil 130130 and a diaphragm assembly 100 according to an embodiment of the present invention, wherein the diaphragm assembly 100 is arranged on one side of the voice coil 130130, and the magnetic circuit system can drive the voice coil 130 to vibrate so as to drive the diaphragm assembly 100 to generate sound.

[0067] Specifically, Figure 1-Figure 3 As shown, the diaphragm assembly 100 includes a ball top portion 120 and a folding ring portion 110 which are integrally foamed from the same base material. One end of the voice coil 130 is bonded to the ball top portion 120. The other end of the voice coil 130 is inserted into the magnetic gap of the magnetic circuit system. The magnetic circuit system includes a magnetic yoke 230, a center magnet 210 and a side magnet 220 arranged on the magnetic yoke 230, a center washer 221 arranged on the center magnet 210, and a side washer 211 arranged on the side magnet 220. The outer fixing portion on the outer side of the folding ring portion 110 is bonded to the side washer 211 by glue so that the vibration system is suspended. A magnetic gap is formed between the center magnet 210 and the side magnet 220.

[0068] The sound-generating device of the present invention at least includes all the beneficial effects of the above-mentioned embodiments, which will not be elaborated here.

[0069] Another embodiment of the present invention provides an electronic device. The electronic device includes the sound-generating device of the above embodiment. The electronic device may be a mobile phone, a smart watch, a computer, a VR device, an AR device, a speaker, etc. The electronic device of the present invention also includes at least all the beneficial effects of the above embodiment, which will not be described in detail here.

[0070] The diaphragm assembly 100 of the present invention is described in detail below with reference to specific embodiments and comparative examples. It is worth noting that the following description is merely exemplary and does not specifically limit the present invention.

[0071] Example

[0072] The folding ring portion 110 of the diaphragm assembly 100 includes two layers of cross-linkable polymer material layers 150 and a layer of thermoplastic polymer material layer. The cross-linkable polymer material layer 150 is an epoxy resin layer. The thermoplastic polymer material layer is a polyurethane thermoplastic elastomer layer. The polyurethane thermoplastic elastomer layer is located between the two epoxy resin layers. The thickness of the folding ring portion 110 is 25 μm. Among them, the thickness of one epoxy resin layer is 5 μm, the thickness of the other epoxy resin layer is 10 μm, and the thickness of the polyurethane thermoplastic elastomer layer is 10 μm.

[0073] The ball top portion 120 of the diaphragm assembly 100 includes two layers of cross-linkable polymer material layers 150, a layer of thermoplastic polymer material layer, and a layer of foam layer 140. The cross-linkable polymer material layer 150 is an epoxy resin layer. The thermoplastic polymer material layer is a polyurethane thermoplastic elastomer layer. The foam layer 140 is a PMI foam layer. The thickness of the ball top portion 120 is 85 μm. Among them, the thickness of one epoxy resin layer is 5 μm, the thickness of another epoxy resin layer is 10 μm, and the thickness of the polyurethane thermoplastic elastomer layer is 10 μm. The thickness of the PMI foam layer 140 is 60 μm. The stacking order is: an epoxy resin layer with a thickness of 5 μm, a polyurethane thermoplastic elastomer layer, a PMI foam layer 140, and an epoxy resin layer with a thickness of 10 μm. The epoxy resin layer with a thickness of 5 μm in the folding ring portion 110 and the ball top portion 120 is cross-linked as a whole. The epoxy resin layer with a thickness of 10 μm in the edge portion 110 and the globe top portion 120 is integrally cross-linked.

[0074] The cross-linking degree of the epoxy resin layer of the rim portion 110 is 5%-8%, and the cross-linking degree of the epoxy resin layer of the ball top portion 120 is greater than or equal to 90%.

[0075] Comparative Example

[0076] The rim 110 and the ball top 120 of the diaphragm assembly 100 are integrally formed. The material of the diaphragm assembly 100 is polyethylene terephthalate, and the thickness of the rim 110 and the ball top 120 are both 25 μm.

[0077] The diaphragm assemblies 100 of the embodiment and the comparative example are both rectangular, and have the same length and width.

[0078] Test items:

[0079] (1) Cross-linking degree test: The cross-linking degree of the cross-linkable polymer material layer 150 is tested by differential scanning calorimetry. The cross-linking degree is calculated based on the enthalpy change of the endothermic peak during the temperature rise process. Cross-linking degree = 1-thermal enthalpy value of the material after reaction / thermal enthalpy value of the material before reaction *%.

[0080] Of course, the degree of cross-linking can also be tested by infrared spectroscopy, thermogravimetric method, swelling method, nuclear magnetic resonance method, etc.

[0081] (2) Young's modulus test: The Young's modulus of the folding ring portion 110 and the ball top portion 120 is tested by a static tensile test.

[0082] (3) Acoustic performance test: Assemble the diaphragm assembly 100 into a sound-generating device. Test the frequency response curve of the sound-generating device. The sound-generating device is a miniature speaker. The model and structure of the sound-generating device in the embodiment and the comparative example are the same.

[0083] Table 1 is a table of test data of embodiments and comparative examples. Figure 41 and 10 are frequency response curves of the embodiment and the comparative example. As can be seen from Table 1, the Young's modulus of the ball top portion 120 of the diaphragm assembly 100 of the embodiment is greater than that of the fold 110 because the cross-linking degree of the ball top portion 120 is greater than that of the fold 110. The ball top portion 120 and the fold 110 of the diaphragm assembly 100 of the comparative example are made of the same material, so the Young's modulus of the ball top portion 120 and the fold 110 are equal.

[0084] Although the thickness of the folding ring portion 110 of the embodiment and the comparative example is the same, due to the material properties of the folding ring portion 110 of the embodiment, its Young's modulus is lower and the elongation at break is greater. Therefore, the diaphragm assembly 100 of the embodiment has a better low-frequency effect.

[0085] The rigidity of the ball top portion 120 is proportional to the square of the material thickness. Since the ball top portion 120 of the embodiment has a PMI foam layer 140, its thickness is greater. It is calculated that the rigidity of the ball top portion 120 of the embodiment is about 1.6 times that of the ball top portion 120 of the comparative example.

[0086] In addition, since the diaphragm assembly 100 of the embodiment contains polyurethane thermoplastic elastomer, which has better elasticity, the diaphragm assembly 100 of the embodiment has a higher elongation at break, and the membrane is less likely to bend or break during vibration.

[0087] Table 1 - Test data table of embodiments and comparative examples

[0088]

[0089] Depend on Figure 4 It can be seen that the resonance frequency F0 of the sound-generating device of the comparative example is 1002 Hz. The resonance frequency F0 of the sound-generating device of the embodiment is 959 Hz. It can be seen that due to the material properties of the folding ring portion 110 of the embodiment and the comparative example, the Young's modulus of the folding ring portion 110 of the embodiment is smaller than that of the folding ring portion 110 of the comparative example. Therefore, the resonance frequency F0 of the sound-generating device of the embodiment is lower than that of the sound-generating device of the comparative example, and the low-frequency frequency response of the sound-generating device of the embodiment is better.

[0090] Since the ball top 120 of the embodiment is thicker, smaller in density, and higher in rigidity than the ball top 120 of the comparison example, the sound-emitting device of the embodiment has a better high-frequency frequency response at 10,000 Hz and a higher high-frequency cutoff frequency, and the sound-emitting device of the embodiment can take into account both low-frequency and high-frequency effects.

[0091] In summary, the diaphragm assembly 100 of the embodiment controls the different cross-linking degrees of the dome 120 and the folding ring 110 to meet the high rigidity of the dome 120 and the high flexibility of the folding ring 110. The cross-linking degree of the dome 120 of the embodiment is greater than or equal to 90%, so that the dome 120 has high rigidity, is not easy to deform during high-frequency vibration, is not easy to have split vibration, and has good high-frequency response. The cross-linking degree of the folding ring 110 of the embodiment is 5%-8%, that is, the cross-linkable polymer material layer 150 of the folding ring 110 is not cross-linked or is cross-linked to a low degree, so that the polymer material can maintain flexibility, the Young's modulus of the folding ring 110 is small, and the low-frequency response is good. In addition, the thickness of the dome 120 of the embodiment is greater than the thickness of the folding ring 110, thereby making the dome 120 more rigid, further improving the high-frequency effect of the diaphragm assembly 100. The diaphragm assembly 100 of the comparative example cannot meet the requirements of high frequency and low frequency at the same time because the thickness of the rim portion 110 and the dome portion 120 are the same and both are made of polyethylene terephthalate.

[0092] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0093] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A diaphragm assembly, characterized in that: It includes a ball top portion located at the center and a folding ring portion arranged on the circumferential outside of the ball top portion, the ball top portion and the folding ring portion contain at least one layer of the same type of cross-linkable polymer material layer, wherein the thickness of the ball top portion is greater than the thickness of the folding ring portion, the cross-linking degree of the ball top portion is 50%-100%, and the cross-linking degree of the folding ring portion is 0-20%.

2. The diaphragm assembly according to claim 1, characterized in that: The thickness of the top of the ball is 10 μm-300 μm, and the thickness of the folding ring is 3 μm-100 μm.

3. The diaphragm assembly according to claim 1, characterized in that: The Young's modulus of the top portion of the ball is greater than the Young's modulus of the folded ring portion.

4. The diaphragm assembly according to claim 3, characterized in that: The Young's modulus of the top of the ball is 0.5 GPa-20 GPa, and the Young's modulus of the folded ring is 0.05 GPa-7 GPa.

5. The diaphragm assembly according to claim 1, characterized in that: The elongation at break of the folding ring portion is 50%-1000%; And / or, the thermal deformation temperature of the top of the ball is greater than or equal to 80°C.

6. The diaphragm assembly according to claim 1, characterized in that: The material of the cross-linkable polymer material layer includes at least one of polyimide, polyarylethernitrile, phenolic resin, epoxy resin, polyurethane resin, thermosetting acrylic resin, polyvinyl chloride, and rubber.

7. The diaphragm assembly according to claim 1, characterized in that: The ball top and the folded ring portion also contain at least one layer of thermoplastic polymer material stacked with the cross-linkable polymer material.

8. The diaphragm assembly according to claim 7, characterized in that: The material of the thermoplastic polymer material layer includes at least one of PET, PEN, PEEK, TPEE and TPU.

9. The diaphragm assembly according to claim 8, characterized in that: The ratio of the thickness of the cross-linkable polymer material layer to the thickness of the thermoplastic polymer material layer is 0.1-5.

10. The diaphragm assembly according to claim 1, characterized in that: The ball top portion further comprises a foam layer, and the cross-linkable polymer material layer is bonded to the foam layer by means of an adhesive film or by means of thermal cross-linking.

11. The diaphragm assembly according to any one of claims 1 to 10, characterized in that: The folding ring portion is circular, rectangular or track-shaped, and the top portion of the ball is flat, dome-shaped or forms a reinforcing rib structure.

12. The diaphragm assembly according to any one of claims 1 to 10, characterized in that: The cross-linkable polymer material layer is cross-linked and formed by at least one of heating cross-linking, radiation cross-linking, moisture cross-linking and room temperature cross-linking.

13. 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 voice coil and a diaphragm assembly as described in any one of claims 1-12, the diaphragm assembly is arranged on one side of the voice coil, and the magnetic circuit system can drive the voice coil to vibrate to drive the diaphragm assembly to make sound.

14. An electronic device, characterized in that: Comprising the sound-generating device as claimed in claim 13.

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