Sound devices and electronic equipment

Abstract

The present invention discloses a sound-generating device and an electronic device, the sound-generating device comprises a vibration system and a magnetic circuit system, the magnetic circuit system is provided with a magnetic gap, the vibration system comprises: a diaphragm, the diaphragm is made of rubber; a composite layer, the center of the diaphragm is integrally formed with at least part of the composite layer; and a voice coil assembly, the voice coil assembly is connected to a side of the composite layer away from the diaphragm, and the voice coil assembly can be movably arranged in the magnetic gap. The technical solution of the present invention is to ensure the connection effect between the diaphragm and the dome, improve the reliability of the speaker, and ensure the quality of the speaker.

Description

Technical Field

[0001] The present invention relates to the field of electroacoustic technology, and in particular to a sound-generating device and an electronic device. Background Art

[0002] Speakers are widely used in mobile smart devices such as mobile phones and tablets. With the development of mobile smart devices, they have higher and higher requirements for speakers in terms of voice and music quality, reliability, weight, size, etc. The diaphragm of the speaker is generally made of polymer materials, and the current development trend is to use rubber membrane as the diaphragm. If the traditional method is used to use glue to bond the rubber membrane and the dome, the rubber membrane and the voice coil assembly, the rubber membrane and the dome need to be bonded to the diaphragm through double-sided tape or glue, and then glue is set on the other side of the dome, and then bonded to the voice coil assembly to form a vibration system. However, there is currently no glue that is beneficial to the acoustic performance of the speaker and has strong adhesion for bonding the rubber membrane and other components. Due to the surface inertness of the rubber material, the two materials are chemically inert, and the trace amount of silicone oil precipitated on the surface of the rubber product may make bonding very difficult. The solubility parameters of the rubber and the surface to be bonded are too different, and the van der Waals force is not enough to adhere the two together. The contact area between the rubber and the surface to be bonded is too small, and the physical compatibility is poor, making the rubber difficult to adhere. In this way, the connection effect between the diaphragm and the dome cannot be guaranteed, which affects the reliability of the speaker and reduces the quality of the speaker. Summary of the invention

[0003] The main purpose of the present invention is to provide a sound-generating device, aiming to ensure the connection effect between the diaphragm and the dome, improve the reliability of the loudspeaker, and ensure the quality of the loudspeaker.

[0004] To achieve the above object, the sound-generating device proposed in the present invention includes a vibration system and a magnetic circuit system, wherein the magnetic circuit system is provided with a magnetic gap, and the vibration system includes:

[0005] A diaphragm, wherein the diaphragm is made of rubber;

[0006] A composite layer, wherein the center of the diaphragm is integrally formed with at least a portion of the composite layer; and

[0007] A voice coil assembly is connected to a side of the composite layer away from the diaphragm, and the voice coil assembly can be movably disposed in the magnetic gap.

[0008] In some embodiments of the present invention, the composite layer includes a first dome and a second dome attached to each other, the voice coil assembly is connected to the first dome, the center of the diaphragm is integrally formed with the second dome, and the center of the first dome and the center of the second dome are concentrically arranged;

[0009] Alternatively, the composite layer includes a first dome and a second dome protruding from the surface of the first dome, the first dome and the second dome are an integrated structure, and the diaphragm is injection-molded / hot-pressed onto the top and side surfaces of the second dome.

[0010] In some embodiments of the present invention, the area of ​​the first dome is greater than the area of ​​the second dome, the voice coil assembly is projected onto the first dome to form a first projection area, and the outer contour of the first projection area includes the outer contour of the second dome;

[0011] And / or, the first spherical top and the second spherical top are bonded and fixed.

[0012] In some embodiments of the present invention, the diaphragm is liquid silicone rubber or liquid nitrile rubber, and the diaphragm is integrated with the second dome by injection molding.

[0013] In some embodiments of the present invention, the diaphragm is solid rubber, and the material of the rubber is one of solid silicone rubber, ethylene acrylate rubber, acrylate rubber, hydrogenated nitrile rubber, solid nitrile rubber or EPDM rubber; or, the rubber is a mixture of at least two of solid silicone rubber, ethylene acrylate rubber, acrylate rubber, hydrogenated nitrile rubber, solid nitrile rubber or EPDM rubber; the diaphragm is hot-pressed and combined with the second dome into one.

[0014] In some embodiments of the present invention, the diaphragm includes a central portion located in the middle, a folding ring portion located outside the central portion, and a fixing portion connected to the folding ring portion, and the central portion and the second dome are integrally formed;

[0015] The diaphragm is defined to have a vibration direction, at least a portion of the folded ring portion is projected onto the first spherical top along the vibration direction to form a second projection area, and at least a portion of the outer contour of the second projection area coincides with the first spherical top.

[0016] In some embodiments of the present invention, the folded ring portion is projected onto a horizontal plane perpendicular to the vibration direction to form a third projection area, and the diaphragm is projected onto a horizontal plane perpendicular to the vibration direction to form a fourth projection area, and the relationship between the area S3 of the third projection area and the area S4 of the fourth projection area is: 0.7≤S3 / S4≤0.9.

[0017] In some embodiments of the present invention, the width w of the folding ring portion has a value range of: 1 mm ≤ w ≤ 2 mm;

[0018] And / or, the height h of the folding ring portion has a value range of: 0.9 mm ≤ h ≤ 1.3 mm.

[0019] In some embodiments of the present invention, the central portion is a flat plate-like structure;

[0020] And / or, the first dome and / or the second dome is a flat plate structure.

[0021] In some embodiments of the present invention, the central portion is provided with an extension section, and the extension section extends from the central portion toward the first spherical top and is connected to a side surface of the second spherical top.

[0022] In some embodiments of the present invention, the extension section is disposed around the periphery of the second spherical top; and the bottom surface of the first spherical top is integrated with the second spherical top.

[0023] In some embodiments of the present invention, a height of the fixing portion in the vibration direction is lower than a height of the central portion.

[0024] In some embodiments of the present invention, the fixing portion includes a fixing body and a fixing groove provided on the fixing body, the fixing body is connected to the folding ring portion, and the fixing groove is used to fix the diaphragm.

[0025] In some embodiments of the present invention, the fixing portion further includes a limiting segment, one side of which is connected to a groove wall of the fixing groove, and the other side of which extends toward a groove opening of the fixing groove.

[0026] In some embodiments of the present invention, the material of the first dome and the second dome includes a rigid material; the rigid material includes at least one of a carbon fiber material, a metal material or a foamed metal.

[0027] The present invention further provides an electronic device, comprising a sound-generating device, wherein the sound-generating device comprises a vibration system and a magnetic circuit system, wherein the magnetic circuit system is provided with a magnetic gap, and the vibration system comprises:

[0028] A diaphragm, wherein the diaphragm is made of rubber;

[0029] A composite layer, wherein the center of the diaphragm is integrally formed with at least a portion of the composite layer; and

[0030] A voice coil assembly is connected to a side of the composite layer away from the diaphragm, and the voice coil assembly can be movably disposed in the magnetic gap.

[0031] The sound-generating device of the present invention is provided with a vibration system and a magnetic circuit system, and a magnetic gap is provided in the magnetic circuit system, and then a diaphragm made of rubber is provided in the vibration system, and the center of the diaphragm is integrally connected with at least a part of the composite layer, and then a voice coil assembly is connected to the side of the composite layer away from the diaphragm, and the voice coil assembly is enabled to move in the magnetic gap. Since the rubber diaphragm and the composite layer are integrally formed, specifically, they can be integrally injected, so that the manufactured rubber diaphragm and the composite layer are connected as one, and there is no need to set glue or other technical means to ensure the connection effect of the rubber diaphragm and the composite layer, and the two can be well fixed. In addition, the voice coil assembly is connected to the side of the composite layer away from the diaphragm, and the vibration can be transmitted through the composite layer to ensure the structural strength of the rubber diaphragm. In addition, since rubber has the advantages of good waterproof performance and good elasticity, the diaphragm made of rubber film has good restoring force, strong water pressure resistance, and no permanent deformation, which can better support the requirements of mobile smart devices such as mobile phones for air tightness and waterproofness, and ensure the sound effect of the sound-generating device. In this way, the technical solution of the present invention can ensure the connection effect between the diaphragm and the dome, improve the reliability of the loudspeaker, and ensure the quality of the loudspeaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of an embodiment of a sound-generating device of the present invention;

[0034] Figure 2 A cross-sectional view of an embodiment of the connection section of the sound-generating device of the present invention disposed toward the magnetic circuit system;

[0035] Figure 3 A cross-sectional view of an embodiment of the connecting section of the sound-generating device of the present invention extending along the vibration direction;

[0036] Figure 4 It is a schematic structural diagram of an embodiment of a diaphragm of a sound-generating device of the present invention.

[0037] Description of Figure Numbers:

[0038] Label name Label name 100 Sound device 122 Second ball top 10 Vibration system 13 Voice Coil Assemblies 11 Diaphragm 131 skeleton 111 Center 132 Voice coil body 112 Ring part 14 Connection segment 113 Fixed part 20 Magnetic circuit system 1131 fixed body 21 Magnetic gap 1132 Fixed slot 22 Center magnet 1133 Limit section 23 Magnetic basin stand 12 Composite layer 24 Washi 121 First ball top 40 Sports Space 1211 Ventilation holes

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The present invention provides a sound generating device 100, please refer to Figures 1 to 4 As shown, in some embodiments of the present invention, the sound-generating device 100 includes a vibration system 10 and a magnetic circuit system 20, wherein the magnetic circuit system 20 is provided with a magnetic gap 21, and the vibration system 10 includes:

[0045] A diaphragm 11, wherein the diaphragm 11 is made of rubber;

[0046] A composite layer 12, wherein the center of the diaphragm 11 and at least a portion of the composite layer 12 are integrally formed; and

[0047] The voice coil assembly 13 is connected to a side of the composite layer 12 away from the diaphragm 11 , and the voice coil assembly 13 is movably disposed in the magnetic gap 21 .

[0048] In this embodiment, in order to simplify the description, the position of the diaphragm 11 of the sound-generating device 100 when it is placed upward is used as a reference to define the up and down, that is, the side of the diaphragm 11 facing away from the magnetic circuit system 20 is the up side, and the side of the diaphragm 11 facing the magnetic circuit system 20 is the down side. At this time, the vibration direction is the up and down direction.

[0049] The general structure and principle of the vibration system 10 can refer to the existing forms. Specifically, the voice coil assembly 13 extends into the magnetic gap 21. The voice coil body 132 of the voice coil assembly 13 is usually wound with metal wire. When the voice coil assembly 13 is connected to the electrical signal, it vibrates up and down in the magnetic field under the action of the Ampere force. The movement of the voice coil assembly 13 drives the diaphragm 11 to vibrate, and its energy conversion mode is electrical energy-mechanical energy-acoustic energy. In order to adjust the frequency characteristics of the vibration, the vibration system 10 may also include a counterweight.

[0050] The form of the magnetic circuit system 20 can also refer to the existing structure. For example, the magnetic gap 21 can be formed between the central magnetic steel 22 and the side magnetic steel, or between the central magnetic steel 22 and the side wall of the magnetic basin frame 23. The top view shape of the central magnetic steel 22 can be circular or rounded rectangular. A washer 24 can also be provided on the central magnetic steel 22, so as to improve the distribution of magnetic flux lines and enhance the motion effect of the voice coil assembly 13.

[0051] In order to facilitate the installation of the vibration system 10 and the magnetic circuit system 20, the sound-generating device 100 further includes a housing, which is used to accommodate the vibration system 10 and the magnetic circuit system 20. The housing is provided with a sound outlet hole for sound emission at a position corresponding to the vibration system 10.

[0052] In some embodiments of the present invention, the diaphragm 11 can generate sounds within the human hearing range, for example, the frequency range is 20-20000 Hz, so that the user can directly receive sound information from the sound device 100. It is understandable that in other embodiments, the diaphragm 11 can also be used to generate sounds in other frequency ranges, such as "sound codes" within the range corresponding to human hearing, which can be decoded by a machine to achieve corresponding signal transmission.

[0053] In some embodiments of the present invention, the voice coil assembly 13 includes a skeleton 131 and a voice coil body 132, the voice coil body 132 is wound around the outside of the skeleton 131, the pad is arranged on the outside of the voice coil body 132, the voice coil body 132 is configured to be able to pass electrical signals, the voice coil body 132 is provided with a lead, the lead is overlapped on the pad, and the skeleton 131 is connected to the first dome 121. The lead can be an enameled wire or a bare wire, when bonding is used for fixing, a certain amount of metal can be exposed on the surface of the enameled wire, and the exposed metal is bonded to the pad; when welding is used for fixing, a bare wire can be used for easy fixing. The skeleton 131 can be provided to facilitate the fixing of the voice coil body 132, thereby ensuring the working stability of the voice coil assembly 13.

[0054] The sound-generating device 100 of the present invention is provided with a vibration system 10 and a magnetic circuit system 20, and a magnetic gap 21 is provided in the magnetic circuit system 20, and then a diaphragm 11 made of rubber is provided in the vibration system 10, and the center of the diaphragm 11 is integrally connected with at least a part of the composite layer 12, and then a voice coil assembly 13 is connected to the side of the composite layer 12 away from the diaphragm 11, and the voice coil assembly 13 is enabled to move in the magnetic gap 21. Since the rubber diaphragm 11 and the composite layer 12 are integrally formed, specifically, they can be integrally injection molded, so that the manufactured rubber diaphragm 11 and the composite layer 12 are connected as one, and there is no need to set glue or other technical means to ensure the connection effect of the rubber diaphragm 11 and the composite layer 12, and the two can be well fixed. In addition, the voice coil assembly 13 is connected to the side of the composite layer 12 away from the diaphragm 11, so that the vibration can be transmitted through the composite layer 12, and the structural strength of the rubber diaphragm 11 can be ensured. In addition, since rubber has the advantages of good waterproof performance and good elasticity, the diaphragm 11 made of rubber film has good restoring force, strong water pressure resistance, no permanent deformation, and can better support the requirements of mobile smart devices such as mobile phones for air tightness and waterproofness, and ensure the sound effect of the sound device 100. In this way, the technical solution of the present invention can ensure the connection effect between the diaphragm 11 and the dome, improve the reliability of the speaker, and ensure the quality of the speaker.

[0055] Reference Figures 1 to 3 In some embodiments of the present invention, the composite layer 12 includes a first dome 121 and a second dome 122 that fit each other, the voice coil assembly 13 is connected to the first dome 121, and the center of the diaphragm 11 is integrally formed with the second dome 122. It can be understood that the dome is DOME, and the sound-generating device 100 at this time can be understood as a dome-type sound-generating device 100. The dome-shaped speaker is one of the most widely used electric speakers in the sound box. Its biggest advantage is excellent mid-high frequency response and wide directivity. In addition, it also has the advantages of good transient characteristics, low distortion and good sound quality.

[0056] In some embodiments of the present invention, the first dome 121 and the second dome 122 can be made of a rigid material, specifically a material with high rigidity, so that, on the one hand, the connection stability after being connected to the voice coil assembly 13 can be ensured, and on the other hand, the vibration effect of the passive radiation diaphragm 11 can be better and the vibration effect can be improved. Specifically, the material of the first dome 121 and the second dome 122 can be a material with a high specific modulus, for example, an aluminum composite material, aluminum, an aluminum-magnesium alloy, a magnesium-lithium alloy material, a carbon fiber, PEN (polyethylene naphthalate), LCP (Liquid Crystal Polymer), a foam, a foamed metal, etc.

[0057] In this embodiment, the material of the first dome 121 and the second dome 122 is a rigid material. Specifically, referring to the above, due to the different properties of the rubber material, the first dome 121 and the second dome 122 can be well bonded and fixed. By setting the first dome 121 and the second dome 122 bonded to each other, the structural strength of the composite layer 12 can be higher and the specific modulus can be larger. Specifically, it can be fixed by glue or tape, so that the vibration energy between the voice coil assembly 13 and the diaphragm 11 can be effectively transmitted, thereby improving the sensitivity of the sound-generating device 100. In addition, since the entire second dome 122 and the rubber diaphragm 11 are integrally formed, on the one hand, it is easy to ensure the integrally formed bonding area, thereby ensuring the bonding and fixing effect, and on the other hand, the injection mold can be set according to the size of the second dome 122, effectively ensuring the processing efficiency. In addition, the voice coil assembly 13 is connected to the first dome 121, so that the force of the composite layer 12 is uniform, and the structural stability of the vibration system 10 is improved. It can be understood that, in one embodiment, the area of ​​the first dome 121 is smaller than the area of ​​the second dome 122. At this time, the composite layer 12 is roughly formed into a trapezoidal structure with a large width on the upper side and a small width on the lower side. The voice coil assembly 13 can be connected to the side surface of the first dome 121 and the bottom surface of the second dome 122, so as to ensure the structural strength of the frame 131 in the voice coil assembly 13 and suppress resonance.

[0058] In some embodiments of the present invention, the composite layer 12 includes a first dome 121 and a second dome 122 convexly arranged on the surface of the first dome 121, the first dome 121 and the second dome 122 are an integral structure, and the diaphragm is injection molded / hot pressed and bonded to the top surface and side surface of the second dome 122. That is, the composite layer 12 is configured as a boss structure, and the diaphragm 11 is injection molded / hot pressed and bonded to the top surface and side surface of the boss. It can be understood that the composite layer 12 in this embodiment is roughly arranged in a "convex" shape, and the diaphragm 11 is then bonded to the upper half of the "convex" shape by injection molding or hot pressing, that is, the top surface and side surface of the second dome. Such a configuration allows the manufactured rubber diaphragm 11 to be connected to the composite layer 12 as a whole, and there is no need to set glue or other technical means to ensure the connection effect between the rubber diaphragm 11 and the composite layer 12, so that the two can be well fixed. At the same time, the combination with the top surface and side surface of the second spherical top (boss) ensures the combination area of ​​the diaphragm 11 and the composite layer 12 of the boss structure, thereby ensuring the combination effect.

[0059] In some embodiments of the present invention, the first dome 121 and / or the second dome 122 is a flat-plate structure. The first dome 121 / second dome 122 of the flat-plate structure can facilitate the miniaturization of the sound-generating device 100.

[0060] Reference Figures 1 to 3 In some embodiments of the present invention, the area of ​​the first dome 121 is greater than the area of ​​the second dome 122, the voice coil assembly 13 is projected onto the first dome 121 to form a first projection area, and the outer contour of the first projection area includes the outer contour of the second dome 122. In this embodiment, the area of ​​the first dome 121 is set to be greater than the area of ​​the second dome 122. This configuration makes the setting area of ​​the voice coil assembly 13 larger, so that the area of ​​the voice coil body 132 for cutting the magnetic flux lines is larger, thereby improving the quality of the sound-generating device 100.

[0061] Furthermore, in some embodiments of the present invention, the first dome 121 is further provided with a connecting section 14 extending along the vibration direction, and the voice coil assembly 13 is fixed to the connecting section 14. In this embodiment, by providing the connecting section 14, the voice coil assembly 13 can be attached to the connecting section 14, thereby increasing the structural strength of the voice coil assembly 13 and suppressing the resonance of the voice coil assembly 13. It can be understood that the connecting section 14 forms a certain angle with the dome, which can be 90 degrees, so as to maximize the bonding area between the connecting section 14 and the voice coil assembly 13.

[0062] Reference Figure 2In some embodiments of the present invention, the connecting section 14 extends toward the magnetic circuit system 20. With this arrangement, the voice coil assembly 13 can be placed deeper in the magnetic gap 21 after being combined with the connecting section 14, thereby increasing the number of magnetic flux lines cut by the voice coil assembly 13, improving the sensitivity of the sound-generating device 100, and facilitating the use of the connecting section 14 to improve the structural strength of the voice coil assembly 13 and suppress resonance.

[0063] In some embodiments of the present invention, the connecting section 14 extends in a direction away from the magnetic circuit system 20. With such a configuration, after the voice coil assembly 13 is combined with the connecting section 14, the height of the vibration system 10 in the vertical direction is smaller, which is conducive to forming a smaller sound-generating device 100, and the structural strength of the voice coil assembly 13 can be improved through the connecting section 14 to suppress resonance.

[0064] In some embodiments of the present invention, the diaphragm 11 is liquid silicone rubber or liquid nitrile rubber, and the diaphragm 11 is combined with the second dome 122 by injection molding. In this embodiment, liquid rubber is used to make the diaphragm 11 integrally formed with the second dome 122, and it is specifically made by an injection molding process. The second dome 122 and the part to be connected to the shell are placed in a mold, and then liquid silicone rubber and liquid nitrile rubber are injected to form a rubber diaphragm 11 after solidification. The rubber diaphragm 11 made of polymer material has the advantages of good waterproofness and good elasticity, and has good recovery force, strong water pressure resistance, no permanent deformation, and can meet the requirements of the sound-generating device for air tightness and waterproofness.

[0065] In some embodiments of the present invention, the diaphragm 11 is solid rubber, and the material of the rubber is one of solid silicone rubber, ethylene acrylate rubber, acrylate rubber, hydrogenated nitrile rubber, solid nitrile rubber or EPDM rubber; or, the rubber is a mixture of at least two of solid silicone rubber, ethylene acrylate rubber, acrylate rubber, hydrogenated nitrile rubber, solid nitrile rubber or EPDM rubber; the diaphragm 11 and the second dome 122 are hot-pressed and combined into one. The rubber material is formed and combined with the surface of the second dome 122 by a hot-pressing process, and no other technical means are required to ensure the connection effect between the diaphragm 11 and the second dome 122, and good sealing and waterproof properties can be achieved, while improving the assembly efficiency of the diaphragm 11 and the second dome 122.

[0066] In some embodiments of the present invention, the second dome 122 is disposed in the middle of the first dome 121. Specifically, the center of the first dome 121 and the center of the second dome 122 are concentrically disposed. It should be noted that when the outer contours of the first dome 121 and the second dome 122 are both regular shapes, the geometric centers of the two coincide, thereby ensuring the uniformity of vibration transmission. In one embodiment, the relationship between the area S1 of the first dome 121 and the area S2 of the second dome 122 is: S1 / S2≤3. When the area difference between the first dome 121 and the second dome 122 is too large, it is easy to cause the strength of the first dome 121 to decrease, affecting the energy transfer between the voice coil assembly 13 and the diaphragm 11. Specifically, the area of ​​the first dome 121 can be set to 23mm 2 The area of ​​the second dome 122 can be set to 10 mm 2 This can ensure the structural strength of the composite layer 12 and facilitate the rubber diaphragm 11 and the second dome 122 to have sufficient molding area.

[0067] In some embodiments of the present invention, the diaphragm 11 includes a central portion 111 located in the middle, a folding ring portion 112 located outside the central portion 111, and a fixing portion 113 connected to the folding ring portion 112, and the central portion 111 and the second dome 122 are integrally formed;

[0068] The diaphragm 11 is defined to have a vibration direction, and at least a portion of the folding ring portion 112 is projected onto the first spherical top 121 along the vibration direction to form a second projection area, and at least a portion of the outer contour of the second projection area coincides with the first spherical top 121 .

[0069] It should be noted that at least part of the folding ring portion 112 is projected onto the first spherical top 121 along the vibration direction to form a second projection area, and at least part of the second projection area overlaps with the first spherical top 121, including several implementation scenarios. In one implementation scenario, the total area of ​​the diaphragm 11 is kept unchanged, at this time the area of ​​the center portion 111 connected to the first spherical top 121 is reduced, and the area of ​​the folding ring portion 112 is increased, so that at least part of the second projection area overlaps with the spherical top. Due to the use of the fixing method of the center portion 111 and the second spherical top 122 being integrally formed, the diaphragm 11 and the composite layer 12 have a good connection effect, and even when the area of ​​the center portion 111 is reduced, good fixation can be achieved. In one implementation scenario, the total area of ​​the diaphragm 11 is changed, at this time the area of ​​the center portion 111 connected to the spherical top remains unchanged, the area of ​​the folding ring portion 112 is increased, at least part of the first projection area overlaps with the spherical top, the linear area of ​​the diaphragm 11 is increased, and the distortion is reduced. In the embodiment of the present invention, part of the folding ring portion 112 overlaps with the dome, which increases the width and extension area of ​​the folding ring portion 112, thereby increasing the linear area of ​​the diaphragm 11 and reducing nonlinear distortion.

[0070] In some embodiments of the present invention, the central portion 111 is a flat plate structure. Setting the central portion 111 as a flat plate structure can save the setting space of the diaphragm 11 in the height direction, which facilitates the miniaturization of the sound-generating device 100.

[0071] Reference Figure 2 , Figure 3 In some embodiments of the present invention, the first dome 121 is provided with a vent 1211, the first dome 121 and the voice coil assembly 13 enclose a motion space 40, the vent 1211 is connected to the motion space 40, and the vent 1211 is located in the second projection area. It can be understood that the vent 1211 is a through hole, and the vent 1211 is a hole type completely formed by the first dome 121 (the vent 1211 is not set as a notch type, and then the first dome 121 is connected to the voice coil assembly 13, and the notch is blocked by the voice coil assembly 13 to form the vent 1211). In this way, the combination area of ​​the first dome 121 and the voice coil assembly 13 can be ensured to be large, thereby improving the fixing effect. By providing the vent 1211, the air flow resistance generated by the first dome 121 when the voice coil assembly 13 moves is relieved by the vent 1211, and part of the air can flow out of the motion space 40 from the vent 1211, thereby improving the gas flowability of the motion space 40 and reducing product distortion. Furthermore, by providing the vent 1211, the mass of the first dome 121 is reduced, which can ensure that the energy transfer loss between the voice coil and the diaphragm 11 is reduced, thereby improving the sensitivity of the speaker. In addition, the airflow generated by the movement of the voice coil can be used to cool the voice coil assembly 13, thereby allowing the speaker to work better at a higher power level and a longer working range.

[0072] In some embodiments of the present invention, the folded ring portion 112 is projected onto a horizontal plane perpendicular to the vibration direction to form a third projection area, and the diaphragm 11 is projected onto a horizontal plane perpendicular to the vibration direction to form a fourth projection area, and the relationship between the area S3 of the third projection area and the area S4 of the fourth projection area is: 0.7≤S3 / S4≤0.9. In this embodiment, the folding ring 112 is set to occupy a larger area of ​​the diaphragm 11. When the ratio S3 / S4 of the area S3 of the third projection area formed by the folding ring 112 to the area S4 of the fourth projection area formed by the diaphragm 11 is less than 0.7, the area of ​​the folding ring 112 will be smaller, so that the linear area of ​​the diaphragm 11 is smaller, which is not conducive to reducing the distortion of the speaker. When the ratio S3 / S4 of the area S3 of the third projection area formed by the folding ring 112 to the area S4 of the fourth projection area formed by the diaphragm 11 is greater than 0.9, the area of ​​the folding ring 112 will be too large, so that the setting area of ​​the part of the diaphragm 11 used for fixing (including the central part 111 and the fixing part 113113) is smaller, which is not conducive to fixing. When the ratio S3 / S4 of the area S3 of the third projection area formed by the folding ring 112 to the area S4 of the fourth projection area formed by the diaphragm 11 is in the range of 0.7 to 0.9, on the one hand, the distortion can be reduced, and on the other hand, the combination effect of the diaphragm 11 with other components can be effectively guaranteed. It can be understood that when the values ​​of S3 / S4 are 0.71, 0.75, 0.79, 0.8, 0.81, 0.85, and 0.89, the distortion can be reduced on the one hand, and the combination effect of the diaphragm 11 with other components can be effectively guaranteed on the other hand.

[0073] Reference Figure 1In some embodiments of the present invention, the width w of the folding ring portion 112 is in the range of 1mm≤w≤2mm; the diaphragm 11 is defined as having a length direction and a width direction perpendicular to each other, the length direction and the width direction are both perpendicular to the vibration direction, and the width value w of the folding ring portion 112 in the width direction is in the range of 1mm≤w≤2mm. It can be understood that the shape of the diaphragm 11 can be circular, elliptical, racetrack-shaped or polygonal. When the diaphragm is circular, the folding ring portion 112 is roughly arranged in a circular ring shape, and the length value obtained in the length direction is equal to the width value obtained in the width direction. When the diaphragm 11 is an elliptical, racetrack-shaped or rectangular long strip structure, at this time, the width direction is the direction with a shorter side length. That is, the value of the folding ring portion 112 at the shorter side length should be greater than 1mm. When it is less than this value, it is easy to make the area of ​​the linear region smaller, and the nonlinear distortion cannot be effectively reduced. When it is greater than 2mm, the area of ​​the diaphragm is relatively large, which is not conducive to the miniaturization of the sound-generating device. When the value range of w is: 1mm≤w≤2mm, on the one hand, it is convenient to ensure the area of ​​the linear region and reduce nonlinear distortion, and on the other hand, it is convenient to miniaturize the product. It can be understood that when the value of w is: 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, etc., on the one hand, it is convenient to ensure the area of ​​the linear region and reduce nonlinear distortion, and on the other hand, it is convenient to miniaturize the product. Since the center of the existing diaphragm is attached to the entire surface of the dome, when the total area of ​​the diaphragm remains unchanged, the width of the folding ring portion 112 is relatively small, generally less than 1mm.

[0074] Reference Figure 1 In some embodiments of the present invention, the height h of the folding ring portion 112 has a value range of 0.9mm≤h≤1.3mm. It can be understood that the height is the height of the folding ring portion 112 in the vibration direction. When the height of the folding ring portion 112 is less than 0.9mm, the linear area formed by the folding ring portion 112 is also small, and the nonlinear distortion cannot be effectively reduced. When the height is greater than 1.3mm, the height of the folding ring portion 112 is large, which is not conducive to the miniaturization of the sound-generating device. When the value range of h is 0.9mm≤h≤1.3mm, on the one hand, it is convenient to ensure the area of ​​the linear area and reduce the nonlinear distortion, and on the other hand, it is convenient to miniaturize the product. It can be understood that when the value of w is 1mm, 1.1mm, 1.2mm, etc., it is convenient to ensure the size of the linear area and reduce the nonlinear distortion on the one hand, and on the other hand, it is convenient to miniaturize the product. Since the center of the existing diaphragm is attached to the entire surface of the dome, the height of the fold 112 is limited when the total area of ​​the diaphragm remains unchanged, and is generally set to be less than 0.9 mm. In addition, when the height of the fold 112 is small, the manufacturing difficulty of the diaphragm is increased, the cost is increased, and the production efficiency is low.

[0075] Reference Figures 1 to 3 In some embodiments of the present invention, the central portion 111 is provided with an extension section, which extends from the central portion 111 to the first dome 121 and is connected to the side of the second dome 122. In this embodiment, the extension section is provided to increase the bonding area between the rubber diaphragm 11 and the second dome 122, thereby improving the bonding effect between the rubber diaphragm 11 and the second dome 122. It can be understood that in this embodiment, a certain interval is formed between the injection cavity formed by the mold and the second dome 122, so that the injected rubber can flow to the edge of the second dome 122 to form an extension section, thereby maximizing the bonding area between the rubber and the second dome 122. Of course, it is understandable that if part of the injection molding cavity is in contact with the second spherical top 122, and another part of the injection molding cavity forms a gap with the second spherical top 122, then the injection molding forms multiple discontinuous extension segments. The arrangement can, on the one hand, ensure that the bonding area between the second spherical top 122 and the rubber diaphragm 11 is increased to a certain extent, thereby improving the connection effect; on the other hand, it can reduce the mass of the rubber diaphragm 11, thereby ensuring that the energy transfer loss between the voice coil assembly 13 and the diaphragm 11 is low, thereby improving the sensitivity of the sound-generating device 100.

[0076] In some embodiments of the present invention, the extension section is arranged around the periphery of the second dome 122; the bottom surface of the first dome 121 is integrated with the second dome 122. By providing the surrounding extension section, the voice coil assembly 13 can be evenly combined with the extension section, thereby improving the stability of the voice coil assembly 13. In addition, the surrounding arrangement can increase the area of ​​the extension section, and after being combined with the voice coil assembly 13, the structural strength of the voice coil assembly 13 can be effectively improved to suppress resonance.

[0077] Referring to the figure, in some embodiments of the present invention, the height of the fixing portion 113 in the vibration direction is lower than the height of the central portion 111. It should be noted that the height is the vertical axis with the vertical direction as the vertical axis, and the fixing portion 113 is located below the position of the central portion 111 on the vertical axis. Such a configuration enables the folding portion 112 of the diaphragm 11 to have a larger surface area, which is conducive to increasing the area of ​​the linear region of the diaphragm 11, thereby reducing the nonlinear distortion of the sound-generating device 100.

[0078] Reference Figures 1 to 3In some embodiments of the present invention, the fixing portion 113 includes a fixing body 1131 and a fixing groove 1132 provided on the fixing body 1131, the fixing body 1131 is connected to the folding ring portion 112, and the fixing groove 1132 is used to fix the diaphragm 11. It can be understood that the fixing groove 1132 is snapped onto the outer shell to fix the diaphragm 11. The diaphragm 11 can be integrally injection molded with the outer shell. Alternatively, a recessed portion can be provided in the outer shell, and the fixing portion 113 can be combined with the outer shell by injection molding or hot pressing. That is, the diaphragm 11 is combined with the outer shell at the same time as molding. The diaphragm 11 is combined with the outer shell by injection molding or hot pressing, which can reduce the steps of fixing the diaphragm 11 and the outer shell and improve the processing efficiency.

[0079] In some embodiments of the present invention, the fixing portion 113 further includes a limiting segment 1133, one side of the limiting segment 1133 is connected to the groove wall of the fixing groove 1132, and the other side extends to the notch of the fixing groove 1132. By providing the limiting segment 1133, the combination area between the fixing portion 113 and the housing is increased, thereby improving the fixing effect of the diaphragm 11. The specific implementation method is similar to the method of forming the extension segment, and will not be repeated here.

[0080] The present invention further proposes an electronic device, which includes a vibration system 10 and a magnetic circuit system 20, wherein the magnetic circuit system 20 is provided with a magnetic gap 21, and the vibration system 10 includes: a diaphragm 11, wherein the diaphragm 11 is made of rubber; a composite layer 12, wherein the center of the diaphragm 11 is integrally formed with at least a portion of the composite layer 12; and a voice coil assembly 13, wherein the voice coil assembly 13 is connected to a side of the composite layer 12 away from the diaphragm 11, and the voice coil assembly 13 is movably disposed in the magnetic gap 21. Since the present electronic device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described one by one herein.

[0081] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: It includes a vibration system and a magnetic circuit system, wherein the magnetic circuit system is provided with a magnetic gap, and the vibration system includes: A diaphragm, wherein the diaphragm is made of rubber and comprises a central portion located in the middle, a folding ring portion located outside the central portion, and a fixing portion connected to the folding ring portion; A composite layer, the composite layer comprising a first dome and a second dome bonded to a surface of the first dome, the central portion being bonded to a top surface and a side surface of the second dome by injection molding / hot pressing, so that the center of the diaphragm is integrally formed with the composite layer; and A voice coil assembly, the voice coil assembly being connected to a side of the first dome facing away from the diaphragm, and the voice coil assembly being movably disposed in the magnetic gap; The area of ​​the first dome is greater than that of the second dome, the voice coil assembly is projected onto the first dome to form a first projection area, and the outer contour of the first projection area includes the outer contour of the second dome; The diaphragm is defined to have a vibration direction, at least a portion of the folded ring portion is projected onto the first spherical top along the vibration direction to form a second projection area, and at least a portion of the outer contour of the second projection area coincides with the first spherical top.

2. The sound-generating device according to claim 1, characterized in that: The composite layer includes the first spherical top and the second spherical top that are attached to each other, and the center of the first spherical top and the center of the second spherical top are concentrically arranged; Alternatively, the composite layer includes the first spherical top and the second spherical top protruding from the surface of the first spherical top, and the first spherical top and the second spherical top are an integrated structure.

3. The sound-generating device according to claim 2, characterized in that: The first spherical top and the second spherical top are bonded and fixed.

4. The sound-generating device according to claim 2, characterized in that: The diaphragm is made of liquid silicone rubber or liquid nitrile rubber, and the diaphragm is integrated with the second dome by injection molding.

5. The sound-generating device according to claim 2, characterized in that: The diaphragm is solid rubber, and the material of the rubber is one of solid silicone rubber, ethylene acrylate rubber, acrylate rubber, hydrogenated nitrile rubber, solid nitrile rubber or EPDM rubber; or, the rubber is a mixture of at least two of solid silicone rubber, ethylene acrylate rubber, acrylate rubber, hydrogenated nitrile rubber, solid nitrile rubber or EPDM rubber; the diaphragm is hot-pressed and integrated with the second dome.

6. The sound-generating device according to claim 1, characterized in that: The folded ring portion is projected onto a horizontal plane perpendicular to the vibration direction to form a third projection area, and the diaphragm is projected onto a horizontal plane perpendicular to the vibration direction to form a fourth projection area. The relationship between the area S3 of the third projection area and the area S4 of the fourth projection area is: 0.7≤S3 / S4≤0.

9.

7. The sound-generating device according to claim 1, characterized in that: The width w of the folding ring portion has a value range of: 1mm≤w≤2mm; And / or, the height h of the folding ring portion has a value range of: 0.9 mm ≤ h ≤ 1.3 mm.

8. The sound-generating device according to claim 1, characterized in that: The central part is a flat plate structure; And / or, the first dome and / or the second dome is a flat plate structure.

9. The sound-generating device according to claim 1, characterized in that: The central portion is provided with an extension section, which extends from the central portion toward the first dome and is connected to the side surface of the second dome; the extension section is arranged around the periphery of the second dome.

10. The sound-generating device according to claim 1, characterized in that: The height of the fixing portion in the vibration direction is lower than the height of the central portion.

11. The sound-generating device according to claim 1, characterized in that: The fixing part includes a fixing body and a fixing groove arranged on the fixing body, the fixing body is connected to the folding ring part, and the fixing groove is used to fix the diaphragm.

12. The sound-generating device according to claim 11, characterized in that: The fixing portion further comprises a limiting section, one side of which is connected to the groove wall of the fixing groove, and the other side of which extends toward the groove opening of the fixing groove.

13. The sound-generating device according to any one of claims 2 to 11, characterized in that: The material of the first dome and the second dome includes a rigid material; the rigid material includes at least one of a carbon fiber material, a metal material or a foamed metal.

14. An electronic device, characterized in that: Comprising the sound-generating device as claimed in any one of claims 1 to 13.

Images