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 portion located at the center position and a folding ring portion arranged on the outer side of the ball top portion in the circumferential direction, the ball top portion and the folding ring portion are integrally formed in a foaming mode through the same base material, the thickness of the folding ring portion is smaller than or equal to that of the ball top portion, and the thickness of the folding ring portion is larger than that of the ball top portion. And the maximum foaming ratio of the folding ring part is smaller than that of the ball top part. According to the vibrating diaphragm assembly, the ball top part and the folding ring part are integrally foamed and formed by adopting the same base material, so that the connection strength of the ball top part and the folding ring part is remarkably improved, and a boundary line of combination of soft and hard materials existing in bonding connection of the folding ring part and the ball top part is prevented; therefore, the ball top part and the folding ring part are prevented from being peeled off in the large-amplitude vibration process, the reliability margin of the large-amplitude vibration of the vibrating diaphragm assembly is improved, the high-frequency vibration consistency is good, and the high-frequency curve is smooth.

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 loudspeaker includes a folding ring and a dome located at the center of the folding ring. The folding ring is mainly made of 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, which requires high adhesive force of the glue. During high-frequency vibration, the folding ring and the dome are easily separated, resulting in poor reliability of the diaphragm assembly. To solve the above problems, a diaphragm assembly in which the folding ring and the dome are integrally formed using engineering plastic materials is proposed in the related art. However, when the thickness of the diaphragm assembly is thin, the high-frequency performance is difficult to meet the requirements due to the low rigidity of the diaphragm assembly; when the thickness is thick, the high-frequency performance can meet the requirements, but due to the excessive rigidity of the diaphragm assembly, the F0 is too high, and the low-frequency performance of the diaphragm assembly is poor. It can be seen that it is difficult for the diaphragm assembly to have both good high-frequency and low-frequency performance. Summary of the invention

[0003] An object of the present invention is to provide a new technical solution for a diaphragm assembly.

[0004] According to a first aspect of the present invention, a diaphragm assembly is provided, which comprises a ball top portion located at a central position and a folding ring portion located circumferentially outside the ball top portion, wherein the ball top portion and the folding ring portion are integrally foamed using the same base material, wherein the thickness of the folding ring portion is less than or equal to the thickness of the ball top portion, and the maximum foaming ratio of the folding ring portion is less than the maximum foaming ratio of the ball top portion.

[0005] Optionally, the thickness of the folding ring portion is 3 μm-100 μm, and the thickness of the top portion of the ball is 30 μm-300 μm.

[0006] Optionally, the maximum foaming ratio of the folding ring portion is 1-3 times, and the maximum foaming ratio of the ball top portion is 1.5-10 times.

[0007] Optionally, along the thickness direction of the diaphragm assembly, the folding ring portion includes two first surface layers and a first core layer located between the two first surface layers, the first surface layers are foaming materials, or the first surface layer and the first core layer are both foaming materials.

[0008] Optionally, the ratio of the total thickness of the two first surface layers to the thickness of the folding ring portion is less than or equal to 50%.

[0009] Optionally, the two first surface layers and the first core layer are both made of foaming materials, wherein:

[0010] The maximum foaming ratio of the first surface layer is greater than the maximum foaming ratio of the first core layer;

[0011] Alternatively, the pore diameter of the folded ring portion decreases gradually from the first surface layer to the first core layer.

[0012] Optionally, the pore diameter of the folded ring portion decreases gradually from the first surface layer to the first core layer, the pore diameter of the pore of the first surface layer is 5 μm-10 μm, and the pore diameter of the pore of the first core layer is 0.1 μm-1 μm.

[0013] Optionally, the porosity of the folding ring portion is 0-60%, and the pore diameter of the folding ring portion is less than or equal to 10 μm;

[0014] And / or, the porosity of the top portion of the ball is 40%-85%, and the pore size of the pores of the top portion of the ball is 5 μm-80 μm.

[0015] Optionally, along the thickness direction of the diaphragm assembly, the dome portion includes two second surface layers and a second core layer located between the two second surface layers, the second core layer is a foaming material, or the second core layer and the second surface layer are both foaming materials.

[0016] Optionally, both the second surface layers and the second core layer are made of foaming materials, wherein the maximum foaming ratio of the second surface layer is less than the maximum foaming ratio of the second core layer.

[0017] Optionally, the two second surface layers are made of non-foamed material, and the second core layer is made of foamed material, wherein the thickness of the second surface layer is 10 μm-100 μm, and the thickness of the second core layer is 10 μm-280 μm.

[0018] Optionally, both the second surface layers and the second core layer are foamed materials, the pore diameter of the spherical top increases gradually from the second surface layer to the second core layer, the pore diameter of the second surface layer is 5μm-20μm, and the pore diameter of the second core layer is 50μm-80μm.

[0019] Optionally, the Young's modulus of the fold is 10MPa-6000MPa, and the specific modulus of the top of the ball is 1GPa / g / cm 3 -20GPa / g / cm 3 .

[0020] Optionally, the matrix material includes at least one of polyethylene terephthalate, polyethylene naphthalate, liquid crystal polymer, polyetheretherketone, polyimide, polyarylethernitrile, polyphenylene sulfide, and polyurethane.

[0021] According to a second aspect of the present invention, a sound-generating device is provided. The device comprises a vibration system and a magnetic circuit system matched with the vibration system, the vibration system comprises a voice coil and a 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.

[0022] According to a third aspect of the present invention, an electronic device is provided, which includes the sound generating device of the present invention.

[0023] In the embodiment of the present invention, the top of the ball and the folding ring are integrally foamed with the same base material, which significantly improves the connection strength between the top of the ball and the folding ring, prevents the appearance of a boundary line between soft and hard materials due to the bonding connection between the folding ring and the top of the ball, avoids the peeling of the top of the ball and the folding ring during large-amplitude vibration, improves the reliability margin of the large-amplitude vibration of the diaphragm assembly, and has good high-frequency vibration consistency and a smooth high-frequency curve. In addition, the maximum foaming ratio of the folding ring is less than the maximum foaming ratio of the top of the ball, so that the folding ring has good elasticity, good compliance, and high damping; the density of the top of the ball is small. The sound-generating device prepared by the diaphragm assembly has a low resonant frequency, good low-frequency response, high mid-frequency sensitivity, and good high-frequency response consistency.

[0024] 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

[0025] 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.

[0026] Figure 1 is a cross-sectional view of a diaphragm assembly according to an embodiment of the present invention.

[0027] Figure 2 is a cross-sectional view of another diaphragm assembly according to an embodiment of the present invention.

[0028] Figure 3 is a cross-sectional view of a sound generating device according to an embodiment of the present invention.

[0029] Figure 4 1 is the frequency response curve of the embodiment of the present invention and the comparative example.

[0030] Description of reference numerals:

[0031] 100, diaphragm assembly; 110, folding ring; 111, first core layer; 112, first surface layer; 120, dome top; 121, second core layer; 122, second surface layer; 130, voice coil;

[0032] 210, center magnet; 211, side washer; 220, side magnet; 221, center washer; 230, basin stand. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0036] 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.

[0037] 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.

[0038] The present invention provides a diaphragm assembly 100. Figure 1 As shown, the diaphragm assembly 100 includes a spherical top portion 120 located at a central position and a folding ring portion 110 arranged on the circumferential outside of the spherical top portion 120, the spherical top portion 120 and the folding ring portion 110 are integrally foamed using the same base material, wherein the thickness of the folding ring portion 110 is less than or equal to the thickness of the spherical top portion 120, and the maximum foaming ratio of the folding ring portion 110 is less than the maximum foaming ratio of the spherical top portion 120.

[0039] 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 provided in sequence from the inside to the outside. The ball top 120 and the folding ring portion 110 are integrally foamed using the same base material. In other words, the ball top 120 and the folding ring portion 110 are made of foaming material and are integrally molded during the preparation process, thereby saving the step of connecting the ball top 120 and the folding ring portion 110, and eliminating the adhesive. Since the same base material is used for integral foaming, there is no boundary between the soft and hard materials between the folding ring portion 110 and the ball top portion 120. In this way, the diaphragm assembly 100 forms an integral structure, the connection strength between the folding ring portion 110 and the ball top portion 120 is significantly improved, the high-frequency vibration consistency is good, and the high-frequency curve is gentle. The base material is a polymer. Optionally, the base material includes at least one of polyethylene terephthalate, polyethylene naphthalate, liquid crystal polymer, polyether ether ketone, polyimide, polyarylether nitrile, polyphenylene sulfide, and polyurethane. The above materials are all capable of foaming and have good elasticity, damping properties, and temperature resistance.

[0040] The diaphragm assembly 100 is foamed by a chemical foaming process or a physical foaming process to form pores inside the folding ring portion 110 and the ball top portion 120. The chemical foaming method is, for example, to add a chemical foaming agent to a polymer, and the chemical foaming agent decomposes and releases gas when heated, thereby forming pores in the polymer. Optionally, the chemical foaming agent includes carbonate, water glass, azo compounds, etc.

[0041] The physical foaming method is, for example, to dissolve liquid gas molecules, such as nitrogen, carbon dioxide, etc., into a high molecular polymer under high pressure, and to make the gas molecules dissolved in the high molecular polymer escape by reducing pressure or increasing temperature, so as to form pores. Physical foaming can also be to add foaming microbeads to the base material, so that pores can be formed inside the folding ring part 110 and the ball top part 120. The foaming microbeads are combined with the pore walls of the base material to form mechanical constraints and limit deformation, so as to improve the strength and modulus of the base material. Among them, the foaming microbeads can be composed of a thermoplastic polymer shell and a liquid alkane gas sealed in the shell.

[0042] In this embodiment, making the diaphragm assembly 100 into a foam material by integral foaming molding can significantly reduce the density of the diaphragm assembly 100, thereby helping to improve the mid-frequency sensitivity and low-frequency response of the sound-generating device using the diaphragm assembly 100.

[0043] The thickness of the base material is proportional to the rigidity. The thickness of the rim 110 is less than or equal to the thickness of the dome 120, so that the dome 120 has high rigidity and can effectively prevent the dome 120 from vibrating at high frequencies. The smaller thickness of the rim 110 makes the rim 110 have lower rigidity and higher compliance, so that the rim 110 has good elasticity.

[0044] The maximum foaming ratio refers to the maximum volume expansion degree that the polymer can achieve, that is, the maximum ratio of the volume of the foamed material to the volume of the unfoamed raw material. When the shape is fixed, the greater the foaming ratio and the greater the thickness, the smaller the density, the smaller the Young's modulus, the smaller the rigidity, and the worse the resilience. In the embodiment of the present invention, the maximum foaming ratio of the folding ring portion 110 is less than the maximum foaming ratio of the ball top portion 120, so that the Young's modulus of the folding ring portion 110 is smaller and the resilience is better; the thickness of the ball top portion 120 is larger and the density is smaller, so that the ball top portion 120 is more rigid, the diaphragm assembly 100 has a higher mid-frequency sensitivity and a better high-frequency response. As a result, the diaphragm assembly 100 has a louder sound, suppresses noise, has greater rigidity, and has a better effect in preventing split vibration.

[0045] In the embodiment of the present invention, the ball top 120 and the folding ring 110 are integrally foamed with the same base material, which significantly improves the connection strength between the ball top 120 and the folding ring 110, prevents the boundary between the soft and hard materials due to the adhesive connection between the folding ring 110 and the ball top 120, avoids the ball top 120 and the folding ring 110 from peeling off during large-amplitude vibration, improves the reliability margin of the large-amplitude vibration of the diaphragm assembly 100, and has good high-frequency vibration consistency and a smooth high-frequency curve. In addition, the maximum foaming ratio of the folding ring is less than the maximum foaming ratio of the ball top, so that the folding ring has good elasticity, good compliance, and high damping; the ball top has a low density. The sound-generating device prepared by the diaphragm assembly has a low resonant frequency, good low-frequency response, high mid-frequency sensitivity, and good high-frequency response consistency.

[0046] In a specific embodiment of the present invention, the thickness of the rim portion 110 is 3 μm-100 μm, and the thickness of the ball top portion 120 is 30 μm-300 μm.

[0047] In this embodiment, when the thickness of the folding ring 110 is less than 3 μm, the manufacturing of the folding ring 110 is difficult, it is difficult to control the foaming ratio, the strength of the folding ring 110 is low, and the folding ring 110 is prone to film breakage; when the thickness of the folding ring 110 is greater than 100 μm, the thickness of the folding ring 110 is too large, affecting the vibration space of the diaphragm assembly 100. When the thickness of the folding ring 110 is 3 μm-100 μm, the diaphragm assembly 100 can have good processing performance, strength and vibration space. Optionally, the thickness of the folding ring 110 is 3 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, etc., and the above values ​​all enable the diaphragm assembly 100 to have good processing performance, strength and vibration space.

[0048] When the thickness of the ball top 120 is less than 30μm, the rigidity of the ball top 120 is too low, and the ball top 120 is prone to split vibration. When the thickness of the ball top 120 is greater than 300μm, the vibration space of the diaphragm assembly 100 is too small. When the thickness of the ball top 120 is between 30μm and 300μm, the ball top 120 can have both high rigidity and a larger vibration space. Optionally, the thickness of the ball top 120 is 30μm, 50μm, 100μm, 150μm, 200μm, 250μm, 280μm, 300μm, etc. The above values ​​all enable the ball top 120 to have both high rigidity and a larger vibration space.

[0049] In a specific embodiment of the present invention, the maximum foaming ratio of the folding ring portion 110 is 1-3 times, and the maximum foaming ratio of the spherical top portion 120 is 1.5-10 times.

[0050] In this embodiment, when the maximum foaming ratio of the folding portion 110 is 1, that is, the folding portion 110 is not foamed, and when the maximum foaming ratio of the folding portion 110 is greater than 3, the Young's modulus of the folding portion 110 is too small and the elasticity is deteriorated. When the maximum foaming ratio of the folding portion 110 is 1-3 times, the folding portion 110 has both good Young's modulus and elasticity. Optionally, the maximum foaming ratio of the folding portion 110 is 1, 1.1, 1.3, 1.5, 1.7, 1.9, 2.0, 2.2, 2.4, 2.6, 2.8, 3, etc. The above values ​​all make the folding portion 110 have both good Young's modulus and rigidity.

[0051] When the maximum foaming ratio of the ball top portion 120 is less than 1.5 times, the weight reduction effect of the ball top portion 120 is not obvious and the density is high; when the maximum foaming ratio of the ball top portion 120 is greater than 10 times, the strength of the ball top portion 120 is poor. When the maximum foaming ratio of the ball top portion 120 is 1.5-10 times, the ball top portion 120 has higher strength and lower density. Optionally, the maximum foaming ratio of the ball top portion 120 is 1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10, etc., and the above values ​​all make the ball top portion 120 have a low density and high strength.

[0052] Furthermore, the maximum foaming ratio of the folding ring 110 is 1.1-2 times, and the maximum foaming ratio of the dome 120 is 3-6 times. This range of values ​​makes the diaphragm assembly 100 have a low density and light weight, the Young's modulus and elasticity of the folding ring 110 are moderate, and the dome 120 has high rigidity and low density.

[0053] In a specific embodiment of the present invention, Figure 1-Figure 2 As shown, along the thickness direction of the diaphragm assembly 100, the folding ring portion 110 includes two first surface layers 112 and a first core layer 111 located between the two first surface layers 112, and the first surface layer 112 is a foaming material, or both the first surface layer 112 and the first core layer 111 are foaming materials.

[0054] During foaming, the base material is placed in a mold. First, the mold is quickly heated by a heating device so that the surface layer of the base material (e.g., the first surface layer 112, the second surface layer 122 described below) foams rapidly. Then, heating of the mold is stopped so that the core layer (e.g., the first core layer 111, the second core layer 121 described below) foams slowly.

[0055] In this embodiment, only the first surface layer 112 is a foaming material, and the first core layer 111 is a non-foaming material; or, the entire folding ring portion 110 is a foaming material. When the first core layer 111 is a non-foaming material, the first core layer 111 can provide sufficient strength and Young's modulus for the folding ring portion 110, and when the first surface layer 112 is a foaming material, the density of the folding ring portion 110 can be small, the weight can be light, the Young's modulus can be low, and the elasticity and damping properties of the folding ring portion 110 can be good. When the first surface layer 112 and the first core layer 111 are both foaming materials, the density of the folding ring portion 110 is small, the weight can be light, the Young's modulus can be low, and the damping performance can be good. Whether the first core layer 111 is a foaming material can be selected according to actual use requirements, and the present invention does not make specific restrictions on this.

[0056] In a specific embodiment of the present invention, the ratio of the total thickness of the two first surface layers 112 to the thickness of the folding ring portion 110 is less than or equal to 50%.

[0057] In this embodiment, when the total thickness of the two first surface layers 112 accounts for more than 50%, the Young's modulus of the folding ring portion 110 is too small, the resilience becomes poor, and the thickness of the folding ring portion 110 required to achieve the designed F0 is larger, which affects the vibration space. When the total thickness of the two first surface layers 112 accounts for less than or equal to 50%, the folding ring portion 110 maintains good elasticity, the Young's modulus is moderate, and the damping performance is good. Optionally, the ratio of the total thickness of the first surface layer 112 to the thickness of the folding ring portion 110 is 10%, 20%, 30%, 40%, 50%, etc. The above values ​​all make the folding ring portion 110 have good elasticity, moderate Young's modulus, and good damping performance.

[0058] In a specific embodiment of the present invention, both the first surface layers 112 and the first core layer 111 are made of foaming materials, wherein:

[0059] The maximum foaming ratio of the first surface layer 112 is greater than the maximum foaming ratio of the first core layer 111;

[0060] Alternatively, the pore diameter of the folded ring portion 110 decreases gradually from the first surface layer 112 to the first core layer 111 .

[0061] In this embodiment, the maximum foaming ratio of the first surface layer 112 is relatively large, so the damping performance of the folding portion 110 is significantly improved, and the maximum foaming ratio of the first core layer 111 is relatively small, so that the folding portion 110 can maintain a sufficient Young's modulus. The maximum foaming ratio of the first surface layer 112 is greater than the maximum foaming ratio of the first core layer 111, so that the folding portion 110 with a relatively thin thickness can obtain a resonance frequency consistent with the folding portion 110 prepared by a uniform foaming process, and the damping of the diaphragm assembly 100 is relatively large, and the distortion of the sound-generating device is small.

[0062] The pore size of the folding ring 110 decreases gradually from the first surface layer 112 to the first core layer 111, which makes the pore size of the first surface layer 112 large and the damping of the folding ring 110 large; the pore size of the first core layer 111 is small, so that the folding ring 110 maintains a sufficient Young's modulus. Therefore, the thinner folding ring 110 can obtain a resonance frequency consistent with the folding ring 110 prepared by a uniform foaming process, and the damping of the diaphragm assembly 100 is large, and the distortion of the sound-generating device is small.

[0063] In a specific embodiment of the present invention, the pore diameter of the folding ring portion 110 decreases gradually from the first surface layer 112 to the first core layer 111, the pore diameter of the first surface layer 112 is 5μm-10μm, and the pore diameter of the first core layer 111 is 0.1μm-1μm.

[0064] In this embodiment, the pores of the first surface layer 112 can improve the damping performance of the folding ring portion 110. When the pore diameter of the first surface layer 112 is less than 5μm, the pores have little improvement on the damping performance of the folding ring portion 110. When the pore diameter of the first surface layer 112 is greater than 10μm, the pores easily penetrate the first surface layer 112 and make the elasticity of the folding ring portion 110 poor. When the pore diameter of the first surface layer 112 is 5μm-10μm, the folding ring portion 110 has both good damping and elasticity. Optionally, the pore diameter of the first surface layer 112 is 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, etc., and the above values ​​all make the folding ring portion 110 have both good damping and elasticity.

[0065] In a specific embodiment of the present invention, the porosity of the folding ring portion 110 is 0-60%, and the pore size of the folding ring portion 110 is less than or equal to 10 μm;

[0066] And / or, the porosity of the ball top portion 120 is 40%-85%, and the pore size of the pores of the ball top portion 120 is 5 μm-80 μm.

[0067] In this embodiment, the greater the porosity of the folding ring portion 110, the lower the strength of the folding ring portion 110. When the porosity of the folding ring portion 110 is greater than 60%, the strength of the folding ring portion 110 is too small, and the membrane is easily broken during the vibration process. When the porosity of the folding ring portion 110 is 0-60%, the folding ring portion 110 has sufficient strength. The thickness of the folding ring portion 110 is usually thin. When the pore diameter of the folding ring portion 110 is greater than 10μm, it is easy to cause through holes in the folding ring portion 110, the pores are unevenly distributed in the folding ring, and the elasticity of the folding ring is poor. When the pore diameter of the folding ring portion 110 is less than or equal to 10μm, the folding ring portion 110 can be effectively avoided from having through holes, thereby improving the reliability of the diaphragm assembly 100. Optionally, the porosity of the folding ring 110 is 0, 10%, 20%, 30%, 40%, 50%, 60%, etc., and the pore size is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc. The above values ​​all make the folding ring 110 have sufficient strength and reliability.

[0068] When the porosity of the ball top 120 is less than 40%, the density of the ball top 120 is reduced less, and the foaming material has little improvement on the quality of the diaphragm assembly 100; when the porosity of the ball top 120 is greater than 85%, it is easy to cause the strength of the ball top 120 to be too low. When the porosity of the ball top 120 is 40%-85%, the ball top has both low density and high strength. When the pore diameter of the ball top 120 is greater than 80μm, it is easy to cause through holes to appear in the ball top 120; when the pore diameter of the ball top 120 is less than 5μm, it is easy to cause the porosity of the ball top 120 to be too low. When the pore diameter of the ball top 120 is 5μm-80μm, the ball top 120 has both low density, light weight and good reliability. Optionally, the porosity of the ball top portion 120 is 40%, 50%, 60%, 70%, 80%, 85%, etc., and the pore size is 5μm, 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, etc. The above values ​​all enable the folding ring portion 110 to have a relatively small density, sufficient strength and reliability.

[0069] In a specific embodiment of the present invention, Figure 1-Figure 2 As shown, along the thickness direction of the diaphragm assembly 100, the ball top 120 includes two second surface layers 122 and a second core layer 121 located between the two second surface layers 122, the second core layer 121 is a foaming material, or the second core layer 121 and the second surface layer 122 are both foaming materials.

[0070] In this embodiment, when the second core layer 121 is a foaming material and the second surface layer 122 is a non-foaming material, the second surface layer 122 can have a greater rigidity and can withstand greater tensile and compressive stresses, and the second core layer 121 is a foaming material, which can effectively reduce the density of the ball top 120. When both the second core layer 121 and the second surface layer 122 are foaming materials, the density of the ball top 120 can be more effectively reduced.

[0071] In a specific embodiment of the present invention, both the second surface layers 122 and the second core layer 121 are made of foaming materials, wherein the maximum foaming ratio of the second surface layer 122 is less than the maximum foaming ratio of the second core layer 121 .

[0072] During the vibration of the diaphragm assembly 100, one of the two second surface layers 122 is subjected to tensile stress and the other is subjected to compressive stress. In order to prevent the two second surface layers 122 from being damaged due to excessive stress, it is necessary to increase the rigidity of the second surface layer 122 to ensure its ability to resist tension and compression. Therefore, the second surface layer 122 adopts a foaming material with a relatively small foaming ratio. The second core layer 121 plays a role in supporting the two second surface layers 122. During the vibration process, the second core layer 121 is subjected to less tensile or compressive stress. Therefore, its rigidity can be relatively small. In order to reduce the density of the ball top 120, the second core layer 121 adopts a foaming material with a relatively large foaming ratio. The diaphragm assembly 100 of this embodiment has high rigidity and low density.

[0073] In a specific embodiment of the present invention, the two second surface layers 122 are non-foamed materials, and the second core layer 121 is a foamed material, wherein the thickness of the second surface layer 122 is 10 μm-100 μm, and the thickness of the second core layer 121 is 10 μm-280 μm.

[0074] In this embodiment, the second surface layer 122 is not made by a foaming process and is a non-foaming material. The second core layer 121 is made by a foaming process and is a foaming material. When the thickness of the second surface layer 122 is less than 10μm, the overall strength of the second surface layer 122 is small and easy to be damaged. When the thickness of the second surface layer 122 is greater than 100μm, the overall thickness of the ball top 120 will be too large, resulting in the vibration space of the diaphragm assembly 100 being too small. When the thickness of the second surface layer 122 is 10μm-100μm, the strength of the second surface layer 122 is high and the overall thickness of the ball top 120 is moderate. Optionally, the thickness of the second surface layer 122 is 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, etc., and the above values ​​all make the strength of the second surface layer 122 high and the overall thickness of the ball top 120 moderate.

[0075] When the thickness of the second core layer 121 is less than 10 μm, the foaming of the second core layer 121 has little effect on improving the thickness of the ball top portion 120, and the support is small, and the rigidity is improved little; when the thickness of the second core layer 121 is greater than 280 μm, the overall thickness of the ball top portion 120 is too large, resulting in too small a vibration space of the diaphragm assembly 100. When the thickness of the second core layer 121 is 10 μm-280 μm, the foaming of the second core layer 121 can significantly increase the thickness of the ball top portion 120, improve the rigidity of the ball top portion 120, and the overall thickness of the ball top portion 120 is moderate. Optionally, the thickness of the second core layer 121 is 10μm, 50μm, 100μm, 150μm, 200μm, 250μm, 280μm, etc. The above values ​​enable the foaming of the second core layer 121 to significantly increase the thickness of the ball top portion 120, improve the rigidity of the ball top portion 120 and make the overall thickness of the ball top portion 120 moderate.

[0076] In a specific embodiment of the present invention, both the second surface layers 122 and the second core layer 121 are foamed materials, and the pore diameter of the spherical top 120 increases gradually from the second surface layer 122 to the second core layer 121, the pore diameter of the second surface layer 122 is 5μm-20μm, and the pore diameter of the second core layer 121 is 50μm-80μm.

[0077] It should be noted that the larger the pore size of the foam material, the smaller the strength; the smaller the pore size, the worse the mid-frequency performance of the diaphragm assembly 100. In this embodiment, the pore size of the spherical top portion 120 increases gradually from the second surface layer 122 to the second core layer 121, so that the spherical top portion 120 has high strength and the diaphragm assembly 100 has good mid-frequency performance.

[0079] In addition, when the pore diameter of the second surface layer 122 is greater than 20 μm, the second surface layer 122 is easily penetrated by the pores, resulting in a lower strength of the second surface layer 122; when the pore diameter of the second surface layer 122 is less than 5 μm, the foaming of the second surface layer 122 has a poor effect on improving the density of the second surface layer 122. When the pore diameter of the second surface layer 122 is 5 μm-20 μm, the strength of the second surface layer 122 is high and the density of the second surface layer 122 is low. Optionally, the pore diameter of the second surface layer 122 is 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 17 μm, 18 μm, 20 μm, etc. The above values ​​all make the strength of the second surface layer 122 high and the density of the second surface layer 122 low.

[0080] When the pore diameter of the second core layer 121 is less than 50 μm, the foaming of the second core layer 121 has a poor effect on improving the density of the second core layer 121; when the pore diameter of the second core layer 121 is greater than 80 μm, the strength of the second core layer 121 is low. When the pore diameter of the second core layer 121 is 50 μm-80 μm, the strength of the second core layer 121 is high and the density of the second core layer 121 is low. Optionally, the pore diameter of the second core layer 121 is 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 78 μm, 80 μm, etc. The above values ​​all make the strength of the second core layer 121 high and the density of the second core layer 121 low.

[0081] In a specific embodiment of the present invention, the Young's modulus of the folding ring 110 is 10MPa-6000MPa, and the specific modulus of the ball top 120 is 1GPa / g / cm 3 -20GPa / g / cm 3 .

[0082] In this embodiment, when the Young's modulus of the folding ring 110 is less than 10MPa, the strength of the folding ring 110 is low and the membrane breakage phenomenon is likely to occur; when the Young's modulus of the folding ring 110 is greater than 6000MPa, it is likely to cause the resonance frequency of the sound-generating device to be high and the low-frequency frequency response to be poor. When the Young's modulus of the folding ring 110 is 10MPa-6000MPa, the strength of the folding ring 110 is high, and the resonance frequency of the sound-generating device is low, and the low-frequency frequency response is good. Optionally, the Young's modulus of the folding ring portion 110 is 10MPa, 500MPa, 1000MPa, 1500MPa, 2000MPa, 2500MPa, 3000MPa, 3500MPa, 4000MPa, 4500MPa, 5000MPa, 5500MPa, 6000MPa, etc. The above values ​​can make the strength of the folding ring portion 110 higher, the resonant frequency of the sound-emitting device lower, and the low-frequency frequency response good.

[0083] The specific modulus is the ratio of the Young's modulus of the material to its density. The specific modulus of the ball top 120 is less than 1 GPa / g / cm 3 When the foaming of the ball top 120 has a small high frequency cutoff frequency for the diaphragm assembly 100; the specific modulus of the ball top 120 is greater than 20 GPa / g / cm 3 The material processing is difficult. The specific modulus of the ball top 120 is 1GPa / g / cm 3 -20GPa / g / cm 3 When the diaphragm assembly 100 has a higher high frequency cutoff frequency, clearly responds to input signals within a wider frequency range, and has lower processing difficulty. Optionally, the specific modulus of the ball top 120 is 1 GPa / g / cm 3, 3GPa / g / cm 3 , 5GPa / g / cm 3 ,7GPa / g / cm 3 , 9GPa / g / cm 3 、10GPa / g / cm 3 、12GPa / g / cm 3 、14GPa / g / cm 3 、16GPa / g / cm 3 、18GPa / g / cm 3 、20GPa / g / cm 3 The above values ​​all enable the diaphragm assembly 100 to have a higher high-frequency cutoff frequency, to respond clearly to input signals within a wider frequency range, and to have lower processing difficulty.

[0084] According to another embodiment of the present invention, a sound-generating device is provided. The sound-generating device includes a vibration system and a magnetic circuit system matched with the vibration system, the vibration system includes a voice coil 130 and a diaphragm assembly 100 of an embodiment of the present invention, the diaphragm assembly 100 is arranged on one side of the voice coil 130, and the magnetic circuit system can drive the voice coil 130 to vibrate to drive the diaphragm assembly 100 to generate sound.

[0085] 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 connected to the ball top portion 120 by glue. 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 external fixing portion outside 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.

[0086] 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.

[0087] According to another embodiment of the present invention, an electronic device is provided. 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.

[0088] 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.

[0089] Example:

[0090] The folding ring portion 110 and the ball top portion 120 of the diaphragm assembly 100 are integrally foamed using the same base material. The base material is polyethylene terephthalate (PET). The thickness of the folding ring portion 110 is 51 μm, and the thickness of the ball top portion 120 is 198 μm. The second surface layer 122 of the ball top portion 120 is not foamed, and the thickness of the second surface layer is 15 μm. The foaming ratio of the second core layer 121 is 3 times, and the thickness of the second core layer 121 is 168 μm. The foaming ratio of the folding ring portion 110 is 1.3 times.

[0091] Comparative Example:

[0092] The diaphragm assembly 100 of the comparative example includes a folding ring portion 110 and a ball top portion 120 bonded together. The folding ring portion 110 is made of polyetheretherketone (PEEK). The ball top portion 120 is made of an aluminum composite ball top. The thickness of the folding ring portion 110 is 50 μm, and the thickness of the ball top portion 120 is 201 μm. The folding ring portion 110 and the ball top portion 120 are bonded with a 30 μm thick pressure-sensitive tape.

[0093] The outer dimensions of the diaphragm assembly 100 in the embodiment and the comparative example are the same.

[0094] test:

[0095] (1) Thickness and mass test: The mass and thickness of the diaphragm assembly 100 of the embodiment and the comparative example were measured.

[0096] (2) Ejection force test: The diaphragm assembly 100 is fixed on the test fixture. The area of ​​the test fixture opposite to the folding ring 110 and the ball top 120 is a hollow structure. Use an upper pressure head to press down the ball top 120 until the diaphragm assembly 100 is broken. The upper pressure head is connected to a pressure sensor, and the maximum value of the pressure sensor during the upper pressure head pressing process is recorded. This maximum value is the ejection force of the diaphragm assembly 100.

[0097] (3) Sound performance test: Assemble the diaphragm assembly 100 into a sound device. Test the frequency response curve of the sound device. The sound device is a miniature speaker. The model and structure of the sound device in the embodiment and the comparative example are the same.

[0098] Table 1 is a table of test data of embodiments and comparative examples. Figure 4The frequency response curves of the embodiment and the comparative example. The thickness of the folding ring portion 110 of the diaphragm assembly 100 of the embodiment is 51 μm, and the thickness of the folding ring portion 110 of the diaphragm assembly 100 of the comparative example is 50 μm. The thickness of the ball top portion 120 of the diaphragm assembly 100 of the embodiment is 198 μm, and the thickness of the ball top portion 120 of the diaphragm assembly 100 of the comparative example is 201 μm. The thicknesses of the diaphragm assembly 100 of the embodiment and the ball top portion 120 of the diaphragm assembly 100 of the comparative example are both greater than the thickness of the folding ring portion 110. As can be seen from Table 1, the mass of the diaphragm assembly 100 of the embodiment is 9 μm, and the mass of the diaphragm assembly 100 of the comparative example is 15 μm.

[0099] Since the diaphragm assembly 100 of the embodiment and the diaphragm assembly 100 of the comparative example have the same size, the thickness of the folding ring portion 110 and the thickness of the ball top portion 120 of the two diaphragm assemblies 100 are not much different. However, the ball top portion 120 of the embodiment and the folding ring portion 110 are integrally foamed using the same base material. The diaphragm assembly 100 of the comparative example uses a non-foaming material, and the folding ring portion 110 is connected to the ball top portion 120 of the aluminum composite material using a pressure-sensitive tape. Since the density of the aluminum composite material is relatively large and the folding ring portion 110 is a non-foaming material, the mass of the diaphragm assembly 100 of the embodiment is significantly less than the mass of the diaphragm assembly 100 of the comparative example.

[0100] The ejection force of the diaphragm assembly 100 of the embodiment is 21 N. The ejection force of the diaphragm assembly 100 of the comparative example is 10 N. It can be seen that the ball top portion 120 and the folding ring portion 110 of the diaphragm assembly 100 of the embodiment are integrally foamed with the same base material. Compared with the method of bonding the ball top portion 120 and the folding ring portion 110 with a pressure-sensitive tape, the method of integrally foaming with the same base material significantly improves the connection strength between the ball top portion 120 and the folding ring portion 110 due to the boundary of the soft and hard materials of the folding ring portion and the ball top being bonded and connected, and the reliability of the diaphragm assembly 100 is high.

[0101] Table 1 - Test data table of embodiments and comparative examples

[0102] Example Comparative Example Mass of diaphragm assembly 100 / mg 9 15 Ejection force of diaphragm assembly 100 / N 21 10

[0103] Depend on Figure 4It can be seen that in the low-frequency range, the frequency response curves of the sound-emitting devices of the embodiment and the comparative example are basically the same, and the low-frequency performance is good. In the vibration frequency range of 800 Hz to 7 kHz, the frequency response curve of the sound-emitting device of the embodiment is above the frequency response curve of the sound-emitting device of the comparative example. This is because the overall mass of the diaphragm assembly 100 of the embodiment is lighter than the overall mass of the diaphragm assembly 100 of the comparative example, so the sound-emitting device of the embodiment has better mid-frequency sensitivity. For example, at 2 KHz in the weight-sensitive area, the sound-emitting device of the embodiment is 1.1 dB louder than the sound-emitting device of the comparative example. In addition, the diaphragm assembly of the embodiment can prevent the boundary between soft and hard, and the high-frequency vibration consistency is better, so that the high-frequency curve is flatter and has better high-frequency expression.

[0104] In summary, the ball top 120 and the folding ring 110 of the diaphragm assembly 110 of the embodiment are integrally foamed with the same base material, which significantly improves the connection strength between the ball top 120 and the folding ring 110, prevents the appearance of a boundary line of soft and hard materials combined due to the bonding connection between the folding ring 110 and the ball top 120, avoids the ball top 120 and the folding ring 110 from peeling off during large-amplitude vibration, improves the reliability margin of large-amplitude vibration of the diaphragm assembly 100, and has good high-frequency vibration consistency and a gentle high-frequency curve. In addition, the thickness of the folding ring 110 is less than or equal to the thickness of the ball top 120, and the maximum foaming ratio of the folding ring 110 is less than the maximum foaming ratio of the ball top 120, thereby, the folding ring 110 has low rigidity, good compliance, and high damping, and the ball top 120 has a large thickness, high rigidity, and low density. The sound-generating device prepared by the diaphragm assembly 100 has a low resonant frequency, good low-frequency response, high intermediate frequency sensitivity, and good high-frequency response consistency while maintaining a low-frequency effect. The folding ring part and the ball top part of the comparative diaphragm assembly are bonded together, and there is a boundary between soft and hard materials between the two. The connection strength is low, and the ball top part and the folding ring part are easily separated. In addition, the diaphragm assembly of the comparative example is made of non-foaming material, the overall mass is large, and the mid-frequency and high-frequency response is poor.

[0105] 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.

[0106] 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 are integrally foamed using the same base material, wherein the thickness of the folding ring portion is less than or equal to the thickness of the ball top portion, and the maximum foaming ratio of the folding ring portion is less than the maximum foaming ratio of the ball top portion.

2. The diaphragm assembly according to claim 1, characterized in that: The thickness of the folding ring portion is 3 μm-100 μm, and the thickness of the top portion of the ball is 30 μm-300 μm.

3. The diaphragm assembly according to claim 1, characterized in that: The maximum foaming ratio of the folding ring portion is 1-3 times, and the maximum foaming ratio of the ball top portion is 1.5-10 times.

4. The diaphragm assembly according to claim 1, characterized in that: Along the thickness direction of the diaphragm assembly, the folding ring portion includes two first surface layers and a first core layer located between the two first surface layers, the first surface layer is a foaming material, or the first surface layer and the first core layer are both foaming materials.

5. The diaphragm assembly according to claim 4, characterized in that: The ratio of the total thickness of the two first surface layers to the thickness of the folding ring portion is less than or equal to 50%.

6. The diaphragm assembly according to claim 4, characterized in that: The two first surface layers and the first core layer are both made of foaming material, wherein: The maximum foaming ratio of the first surface layer is greater than the maximum foaming ratio of the first core layer; Alternatively, the pore diameter of the folded ring portion decreases gradually from the first surface layer to the first core layer.

7. The diaphragm assembly according to claim 6, characterized in that: The pore diameter of the folded ring portion decreases gradually from the first surface layer to the first core layer. The pore diameter of the pores of the first surface layer is 5 μm-10 μm, and the pore diameter of the pores of the first core layer is 0.1 μm-1 μm.

8. The diaphragm assembly according to claim 1, characterized in that: The porosity of the folding ring is 0-60%, and the pore diameter of the folding ring is less than or equal to 10 μm; And / or, the porosity of the top portion of the ball is 40%-85%, and the pore size of the pores of the top portion of the ball is 5 μm-80 μm.

9. The diaphragm assembly according to claim 1, characterized in that: Along the thickness direction of the diaphragm assembly, the dome portion includes two second surface layers and a second core layer located between the two second surface layers, the second core layer is a foaming material, or the second core layer and the second surface layer are both foaming materials.

10. The diaphragm assembly according to claim 9, characterized in that: The two second surface layers and the second core layer are both made of foaming materials, wherein the maximum foaming ratio of the second surface layer is less than the maximum foaming ratio of the second core layer.

11. The diaphragm assembly according to claim 9, characterized in that: The two second surface layers are made of non-foamed material, and the second core layer is made of foamed material, wherein the thickness of the second surface layers is 10 μm-100 μm, and the thickness of the second core layer is 10 μm-280 μm.

12. The diaphragm assembly according to claim 9, characterized in that: The two second surface layers and the second core layer are both foamed materials, and the pore size of the pores at the top of the ball increases gradually from the second surface layer to the second core layer. The pore size of the pores in the second surface layer is 5μm-20μm, and the pore size of the pores in the second core layer is 50μm-80μm.

13. The diaphragm assembly according to any one of claims 1 to 12, characterized in that: The Young's modulus of the folded ring is 10MPa-6000MPa, and the specific modulus of the top of the ball is 1GPa / g / cm 3 -20GPa / g / cm 3 .

14. The diaphragm assembly according to any one of claims 1 to 12, characterized in that: The matrix material includes at least one of polyethylene terephthalate, polyethylene naphthalate, liquid crystal polymer, polyetheretherketone, polyimide, polyarylethernitrile, polyphenylene sulfide, and polyurethane.

15. 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 1-14, 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.

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

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