A sound-generating vibration device and electronic equipment

Abstract

The present invention belongs to the technical field of terminal equipment manufacturing, and specifically relates to a sound-generating vibration device and an electronic device, wherein the sound-generating vibration device includes a vibration motor and a sound-generating unit, the vibration motor includes a drive system and a magnetic circuit system matched with the drive system, the sound-generating unit includes a vibration system matched with the magnetic circuit system, and the vibration system and the magnetic circuit system have a common vibration direction. According to the sound-generating vibration device of the present invention, while the sound-generating vibration device realizes vibration and sound, it not only effectively reduces the overall thickness of the vibration motor and the sound-generating unit in the vibration direction, thereby freeing up space for optimizing the sound-generating unit, but also can effectively alleviate the shell vibration problem of the sound-generating vibration device and improve user experience.

Description

Technical Field

[0001] The present invention belongs to the technical field of terminal equipment manufacturing, and in particular relates to a sound-generating vibration device and an electronic device. Background Art

[0002] With the rapid development of smart wearable products, users' demand for sound has risen to the demand for sound quality. The sound of the audio system is emitted by the front-end acoustic transducer, and the quality of the acoustic device will affect the sound quality of the entire audio system. In theory, the low-frequency driving ability of the speaker in the acoustic device is closely related to the maximum volume driving force of its diaphragm. Improving the maximum volume driving force has become the most mainstream direction for the design optimization and application improvement of micro speakers. However, as the maximum volume driving force of the speaker increases, the vibration generated when it sounds also increases accordingly, which causes the shell vibration problem on the whole machine end, affecting the user experience.

[0003] On the other hand, the demand for tactile feedback devices in smart wearable products has gradually become prominent. However, the lightweight development demand of smart wearable products conflicts with the large size of acoustic devices and tactile feedback devices. The existing acoustic and tactile devices cannot meet the design requirements of the entire machine at the same time. Summary of the invention

[0004] The object of the present invention is to provide a sound-generating vibration device and an electronic device, so as to at least solve the problem that the sound-generating vibration device integrated with a vibration motor in the prior art is large in size and has shell vibration.

[0005] A first aspect of the present invention provides a sound-generating vibration device, the sound-generating vibration device comprising:

[0006] case;

[0007] A vibration motor, the vibration motor is arranged in the housing and comprises a drive system and a magnetic circuit system matched with the drive system, the drive system is fixed to the housing, the magnetic circuit system at least comprises a yoke protruding outward, and the yoke is elastically connected to the housing;

[0008] A sound generating unit, the sound generating unit is arranged in the housing and comprises a vibration system matched with the magnetic circuit system; the vibration system is elastically connected to the housing and has the same vibration direction as the magnetic circuit system;

[0009] A first limit block is provided between the yoke and the housing and is located at a side of the protruding portion of the yoke close to the vibration system.

[0010] According to the sound-generating vibration device of the present invention, by providing a vibration motor and a sound-generating unit, and making the vibration motor and the sound-generating unit share a magnetic circuit system, the overall thickness of the sound-generating vibration device in the vibration direction is effectively reduced while achieving vibration and sound generation, and while ensuring the sound and vibration performance of the sound-generating vibration device, space is freed up for the optimization of the sound-generating unit, thereby improving the sound quality of the sound-generating vibration device. At the same time, when the sound-generating unit is working, since the magnetic circuit system is elastically connected to the shell and is subjected to the reaction force of the vibration system, the magnetic circuit system can vibrate synchronously with the vibration system at the same vibration frequency and in the opposite vibration direction under the action of the reaction force, thereby offsetting the vibration effect of the sound-generating unit to a certain extent, thereby reducing the shell vibration problem of the sound-generating vibration device and improving the user experience. In addition, by providing a limit assembly including a first limit block, the impact of the magnetic circuit system on the shell during vibration can be buffered, thereby improving the stability of the sound-generating vibration device.

[0011] In addition, the sound-generating vibration device according to the present invention may also have the following additional technical features:

[0012] In some embodiments of the present invention, a second limit block is further included, wherein the second limit block is disposed between the magnetic yoke and the shell and is located on a side of the magnetic yoke away from the vibration system.

[0013] In some embodiments of the present invention, the first limiting block and the second limiting block may be made of foam and / or rubber material.

[0014] In some embodiments of the present invention, the thickness of the first limiting block and / or the second limiting block satisfies the following formula:

[0015] X f *(1-σ)+X max ≤X p ,

[0016] Among them, X f is the thickness of the first stopper or the second stopper, σ is the compression ratio of the first stopper or the second stopper, X max is the maximum displacement of the vibration motor in the vibration direction, X p A vibration space is reserved for the shell in the corresponding vibration direction.

[0017] In some embodiments of the present invention, the magnetic circuit system also includes side magnets and a center magnet arranged on the yoke, and a magnetic gap is formed between the side magnets and the center magnet; the vibration system includes a voice coil, and the voice coil is inserted into the magnetic gap; the driving system includes a driving coil, and the driving coil is fixed on the shell outside the side magnets.

[0018] In some embodiments of the present invention, a first extending portion extends inwardly from a side wall of the shell, a first protruding portion protrudes outwardly from an outer edge of the yoke, and the first limiting block is disposed between the first extending portion and the first protruding portion.

[0019] In some embodiments of the present invention, the first extension portion is located at two ends of the shell, and the first protruding portion is located at two ends of the yoke; there are two first limit blocks, which are respectively arranged between the first extension portion and the first protruding portion at two ends of the magnetic circuit system.

[0020] In some embodiments of the present invention, there are a plurality of the second limit blocks, and the plurality of the second limit blocks are evenly arranged on the bottom surface of the shell and matched with the lower surface of the yoke.

[0021] In some embodiments of the present invention, the magnetic circuit system further includes a first magnetic conductive plate and a second magnetic conductive plate, wherein the first magnetic conductive plate is disposed on the upper surface of the central magnet, and the number of the second magnetic conductive plates is two and they are disposed on the upper surfaces of the side magnets on both sides.

[0022] Another aspect of the present invention provides an electronic device, which comprises any one of the above-mentioned sound-generating vibration devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the sound-generating vibration device in some embodiments of the present application;

[0025] Figure 2 For Figure 1 An exploded view of the sound-generating vibration device;

[0026] Figure 3 for Figure 2 A schematic diagram of the structure of the front side of the sound-generating vibration device;

[0027] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of AA;

[0028] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure of the middle BB;

[0029] Figure 6for Figure 1 A partial cutaway diagram of

[0030] Figure 7 for Figure 1 Schematic diagram of the structure of the central magnetic circuit assembly and part of the shell;

[0031] Figure 8 A schematic diagram of the structure of a partial shell;

[0032] Fig. 9 for Figure 2 Schematic diagram of the connection structure of the elastic member;

[0033] Fig.10 for Figure 2 Schematic diagram of the vibration system.

[0034] Description of reference numerals:

[0035] 1: Sound-generating vibration device;

[0036] 10: sound unit;

[0037] 11: vibration system, 111: diaphragm, 1111: folding ring, 1112: inner fixing part, 1113: outer fixing part, 112: dome, 113-voice coil;

[0038] 12: Centering support piece;

[0039] 20: Vibration motor;

[0040] 21: magnetic circuit system, 211: magnetic yoke, 2111: first extension, 212: side magnet, 213: center magnet, 214: first magnetic conductive plate, 215: second magnetic conductive plate;

[0041] 22: driving coil;

[0042] 23: elastic member, 231: first connecting portion, 232: second connecting portion, 233: elastic portion;

[0043] 30: Shell;

[0044] 31: cover plate, 32: middle shell, 321: injection molded shell, 3211: second extension portion, 322: connecting insert, 3221: first extension portion, 33: lower shell, 331: boss, 332: flange, 34: first limit block, 35: second limit block, 36: flexible printed circuit board. DETAILED DESCRIPTION

[0045] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0046] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0047] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0048] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0049] As electronic devices are becoming more and more intelligent and lightweight at this stage, for the sound-generating vibration device 1 coupled with the vibration motor 20, while ensuring the sound quality of the sound-generating vibration device 1 and the vibration function of the vibration motor 20, more attention is paid to improving the sound quality, thereby improving the performance of the sound-generating vibration device 1. A first aspect of the present application proposes a sound-generating vibration device 1, which is used in an electronic device, so that the electronic device can generate sound and vibrate.

[0050] Combination Figures 1 to 10 In some embodiments of the present application, the sound-generating vibration device 1 includes a vibration motor 20 and a sound-generating unit 10. The vibration motor 20 includes a drive system and a magnetic circuit system 21 that cooperates with the drive system. The sound-generating unit 10 includes a vibration system 11 that cooperates with the magnetic circuit system 21. The vibration motor 20 and the sound-generating unit 10 share the same magnetic circuit system 21, and the vibration direction of the vibration system 11 is the same as that of the magnetic circuit system 21.

[0051] Specifically, Figure 4-5As shown, the driving system is arranged outside the magnetic circuit system 21, and is suitable for driving the magnetic circuit system 21 to vibrate up and down to realize the vibration function of the vibration motor 20; the vibration system 11 is stacked on the magnetic circuit system 21, and the vibration system 11 is driven to vibrate through the magnetic circuit system 21 to realize sound generation. Due to the shared magnetic circuit system 21, the sound-generating vibration device 1 effectively reduces the overall thickness of the vibration motor 20 and the sound-generating unit 10 in the vibration direction while realizing vibration and sound generation, thereby reducing the overall thickness of the sound-generating vibration device 1, ensuring the sound generation and vibration functions of the sound-generating vibration device 1, and facilitating the optimization of the generating unit in the sound-generating vibration device 1 to improve the sound quality. In addition, when the sound unit 10 is working, since the magnetic circuit system 21 is elastically connected to the shell 30 and is subjected to the reaction force of the vibration system 11, the magnetic circuit system 21 can vibrate synchronously with the vibration system 11 at the same vibration frequency and in the opposite vibration direction under the action of the reaction force, thereby offsetting the vibration effect of the sound unit 10 to a certain extent, thereby reducing the shell vibration problem of the sound vibration device 1 and improving the user experience; further, the reverse vibration of the magnetic circuit system can be controlled by the driving coil 22 to offset the vibration.

[0052] Specifically, Figure 4 , Figure 5 and Fig.10 As shown, in some embodiments of the present application, the vibration system 11 includes a diaphragm 111, a dome 112 and a voice coil 113. The diaphragm 111 includes a folding ring portion 1111 and an inner fixing portion 1112. The dome 112 is fixed to the inner fixing portion 1112. Further, the dome 112 is connected to the surface of the inner fixing portion 1112 away from the magnetic circuit system 21. One end of the voice coil 113 is connected to the dome 112, and the other end of the voice coil 113 is inserted into the magnetic gap of the magnetic circuit system 21.

[0053] By inserting the bottom end of the voice coil 113 into the magnetic gap of the magnetic circuit system 21, when the voice coil 113 is energized, the voice coil 113 can vibrate up and down along its own axis under the action of the magnetic circuit system 21, and directly drive the dome 112 to vibrate, thereby vibrating and making sound.

[0054] Combination Figure 4 , Figure 5 and Fig.10 As shown, in some embodiments of the present application, the folding ring portion 1111 is protruded toward the direction of the magnetic circuit system 21. That is, the folding ring portion 1111 is protruded toward the inner direction of the sound-generating vibration device 1, thereby further reducing the outer thickness dimension of the sound-generating vibration device 1, hiding the folding ring portion 1111 inside the sound-generating vibration device 1, and having enough vibration space, thereby further reducing the overall thickness dimension of the sound-generating vibration device 1.

[0055] Combination Figure 2 , Figure 5 , Figure 6 , Figure 7 As shown, in some embodiments of the present application, the magnetic circuit system 21 includes a yoke 211 and a side magnet 212 and a center magnet 213 disposed on the yoke 211, and a magnetic gap is formed between the side magnet 212 and the center magnet 213. The magnetization directions of the side magnet 212 and the center magnet 213 are opposite, and are both parallel to the vibration direction of the magnetic circuit system 21.

[0056] Specifically, in some embodiments of the present application, the first magnetic yoke 211 is a plate-shaped structure, and the side magnets 212 and the center magnet 213 are both connected to the magnetic yoke 211 by gluing. Figure 5 , Figure 7 The side magnets 212 are arranged on both sides of the center magnet 213, and the side magnet 212 on one side is composed of two magnets, and the four magnets on both sides are arranged in two parallel rows to surround the two sides of the center magnet 213, thereby forming a magnetic gap for the voice coil 113 to be inserted.

[0057] In some embodiments of the present application, a first magnetic conductive plate 214 is further provided on the surface of the central magnet 213 facing upwards of the vibration system 11, and a second magnetic conductive plate 215 is further provided on the surface of the outer magnet facing the vibration system 11, and a magnetic gap is formed between the first magnetic conductive plate 214, the central magnet 213, the second magnetic conductive plate 215, and the side magnet 212. The first magnetic conductive plate 214 and the second magnetic conductive plate 215 are respectively attached to the upper surfaces of the central magnet 213 and the side magnet 212, so as to enhance the magnetic field strength passing through the voice coil 113.

[0058] By inserting the end of the voice coil 113 into the magnetic gap formed by the first magnetic conductive plate 214, the center magnet 213, the second magnetic conductive plate 215 and the side magnet 212, when the voice coil 113 vibrates, not only a balanced magnetic driving force can be obtained, but also the vibration space can be fully utilized.

[0059] In some embodiments of the present application, the driving system includes two driving coils 22, and the two driving coils 22 are respectively arranged on both sides of the magnetic circuit system 21. Specifically, the driving coil 22 is located in the magnetic field formed by the edge magnet 212. When power is turned on, there is an Ampere force between the driving coil 22 and the edge magnet 212, and relative movement occurs under the drive of the Ampere force. Since the driving coil 22 is fixed to the shell, the edge magnet 212 vibrates under the reaction, thereby driving the magnetic circuit system 21 to vibrate together, thereby realizing the vibration function of the vibration motor 20.

[0060] Combination Figure 2 , Figure 4 , Figure 5 , Figure 6As shown, in some embodiments of the present invention, the sound-generating vibration device 1 also includes a shell 30, wherein the driving system is fixed to the shell 30, the magnetic circuit system 21 is elastically connected to the shell 30 through an elastic component, and the vibration system 11 is elastically connected to the shell 30.

[0061] In some embodiments of the present invention, the shell 30 is a rectangular parallelepiped shell structure, including a cover plate 31, a middle shell 32 and a lower shell 33. The cover plate 31 is a rectangular ring structure, and a central opening is provided in the center thereof, which is directly opposite to the vibration system 11. The middle shell 32 includes an injection molded shell 321 located at both ends and a connecting insert 322 spanning the long axis and disposed on both sides. The injection molded shell 321 and the connecting insert 322 are injection molded as a whole to form the middle shell 32; each end of the injection molded shell 321 extends inwardly with a second extension portion 3211, so that the second extension portion 3211 is disposed at the diagonal of the middle shell 32, and the end of the connecting insert 322 extends inwardly with a first extension portion 3221, and the first extension portion 3221 is located between the two second extension portions 3211 at the same end. The upper surface of the middle shell is a plane, and its injection molded shell is fixedly connected to the cover plate 31 by fasteners. The lower surface of the middle shell is a special shape, and is adapted and welded with the groove-shaped lower shell through the connecting inserts disposed on both sides. The cover plate 31 , the middle shell 32 and the lower shell 33 together form a vibration chamber for installing the vibration motor 20 and the sound unit 10 .

[0062] Furthermore, in some embodiments of the present application, the outer edge of the diaphragm 111 is connected to the middle shell 32 by gluing, hot pressing or integral injection molding.

[0063] Recombination Fig.10 As shown, the diaphragm 111 is also provided with an external fixing portion 1113, which is arranged at the outer edge of the diaphragm 111 and connected to the folding ring portion 1111. The diaphragm 111 is connected to the upper surface of the middle shell 32 through the external fixing portion 1113, and then the fixing portion is tightened by the cooperation of the cover plate 31 and the middle shell 32 to strengthen the connection.

[0064] In some embodiments of the present application, the diaphragm 111 is an integral injection-molded part, which can effectively improve the overall strength of the diaphragm 111 and ensure the vibration effect while avoiding separation from the dome 112 during the vibration process.

[0065] In some embodiments of the present application, the top of the voice coil 113 is connected to the dome 112, and the bottom of the voice coil 113 is connected to the middle shell 32 through the centering support plate 12 assembly, thereby fixing the two ends of the voice coil 113 to ensure that the voice coil 113 vibrates up and down in the magnetic gap. Specifically, the centering support plate assembly includes four centering support plates 12, which are arranged along two diagonal corners of the middle shell 32 and are respectively connected to the second extension part 3211 formed by extending inward from the diagonal corners of the middle shell 32, thereby further ensuring the support strength of the voice coil 113.

[0066] In some embodiments of the present application, a protrusion 332 is provided on the long axis side wall of the lower shell 33, and the driving coil 22 is installed and positioned through the protrusion 332, and a boss 331 suitable for connecting with the magnetic circuit system 21 is provided on the short axis side of the bottom wall. The driving coil 22 is energized through a flexible printed circuit board 36 provided at the bottom of the groove of the lower shell 33.

[0067] like Figure 2 , Figure 7 As shown, in some embodiments of the present application, the vibration motor 20 further includes an elastic component, and the yoke 211 is connected to the lower shell 33 via the elastic component.

[0068] like Fig. 9 As shown, in some embodiments of the present application, the elastic member 23 includes an elastic portion 233 and a first connecting portion 231 and a second connecting portion 232 respectively connected to both ends of the elastic portion 233 , the first connecting portion 231 is connected to the yoke 211 , and the second connecting portion 232 is connected to the shell 30 .

[0069] Specifically, the first connection part 231 is connected to the yoke 211 by welding, and the second connection part 232 is clamped between the middle shell 32 and the lower shell 33. Specifically, the boss 331 set on the short axis side of the bottom wall of the lower shell 33 is adapted to clamp the second connection part 232 with the bottom surface of the injection molded shell 321.

[0070] In some embodiments of the present application, the elastic portion 233 is as follows Fig. 9 In the W-shaped member shown, one end of the W-shaped member extends outward to form a first connection portion 231 , and the other end of the W-shaped member extends outward to form a second connection portion 232 .

[0071] Specifically, the elastic member 23 is a planar structure, which includes a W-shaped member and a first connecting portion 231 and a second connecting portion 232 connected to both ends of the W-shaped member, and is suitable for ensuring the normal vibration process of the elastic member 23 through the deformation ability of the W-shaped member.

[0072] like Figure 7 As shown, in some embodiments of the present application, the number of the elastic members 23 is four, and the four elastic members 23 are evenly distributed at both ends of the shell 30 , thereby further ensuring the elastic support strength and stability of the magnetic circuit system 21 .

[0073] In some embodiments of the present application, an elastic component is further provided, and a limit component is provided between the magnetic circuit system 21 and the inner wall of the shell 30, suitable for limiting the vibration range of the magnetic circuit system 21 in the vibration direction.

[0074] In some embodiments of the present application, the limit assembly includes a first limit block 34 provided on the shell 30, the first limit block 34 is located in a vibration direction of the magnetic circuit system 21, and is suitable for limiting the vibration range in this direction; and / or, the limit assembly includes a second limit block 35 provided on the shell 30, the second limit block 35 is located in another vibration direction of the magnetic circuit system 21, and is suitable for limiting the vibration range in this direction.

[0075] Specifically, the first limit block 34 is located above the magnetic circuit system 21, and the second limit block 35 is provided below the magnetic circuit system 21, which are suitable for limiting the vibration range of the magnetic circuit system 21 in the upper and lower vibration directions respectively.

[0076] Combination Figure 4 , Figure 6 As shown, in some embodiments of the present application, a first extension portion 3221 extends inwardly from the side wall of the shell 30, a first extension portion 2111 extends outwardly from the outer edge of the yoke 211, and a first limit block 34 is disposed between the first extension portion 3221 and the upper surface of the first extension portion 2111.

[0077] In some embodiments of the present application, there are two first limit blocks 34 , which are disposed at two ends of the housing 30 and correspond to the positions of the first protruding portions 2111 located between the two elastic members 23 .

[0078] Combination Figure 5 , Figure 7 As shown, in some embodiments of the present application, there are multiple second limit blocks 35, and the multiple second limit blocks 35 are evenly arranged on the bottom surface of the housing 30 and adapted to the lower surface of the yoke 211. Specifically, the number of the second limit blocks 35 is four, and the four second limit blocks 35 are arranged in a rectangular shape, or the number of the second limit blocks 35 is five, four of which are arranged in a rectangular shape, and another limit block is arranged at the center of the four limit blocks.

[0079] In some embodiments of the present application, the first limit block 34 and the second limit block 35 can be made of foam and / or rubber material with a high compression ratio. The first limit block 34 and the second limit block 35 made of foam material with a high compression ratio or rubber material with a high compression ratio can have a larger elastic deformation space, so that by setting the thickness of the first limit block 34 and the second limit block 35, most of the vibration stroke of the magnetic circuit system is in contact with the limit component, and then the vibration stability of the magnetic circuit system is improved through the limit component.

[0080] In some embodiments of the present application, the thickness of the first limiting block 34 and / or the second limiting block 35 satisfies the following formula:

[0081] X f *(1-σ)+X max≤X p ,

[0082] Among them, X f is the thickness of the first limiting block 34 or the second limiting block 35, σ is the compression ratio of the first limiting block 34 or the second limiting block 35, X max is the maximum displacement of the vibration motor 20 in the vibration direction, X p A vibration space is reserved for the housing 30 in the corresponding vibration direction.

[0083] Based on the above formula, the maximum amplitude of the magnetic circuit system can be met to ensure the vibration effect, and the thickness of the limit component can be made to reach the maximum value, thereby ensuring the vibration stability of the magnetic circuit system.

[0084] Another aspect of the present application also provides an electronic device having the above-mentioned sound-generating vibration device 1. Since the electronic device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sound-generating vibration device, characterized in that: include: Shell; the shell comprises a cover plate, a middle shell and a lower shell, the middle shell comprises an injection-molded shell located at both ends and connecting inserts located at both sides of the injection-molded shell, the injection-molded shell and the connecting insert are injection-molded as one piece; each end of the injection-molded shell has a second extension extending inwardly, so that the second extension is arranged at the diagonal of the middle shell, the end of the connecting insert has a first extension extending inwardly, and the first extension is located between the two second extensions at the same end; the upper surface of the middle shell is a plane and is connected to the annular cover plate, the lower surface of the middle shell is a special shape, and is adapted and welded with the groove-shaped lower shell through the connecting inserts on both sides; A vibration motor, the vibration motor is arranged in the housing and includes a drive system and a magnetic circuit system matched with the drive system, the drive system includes a drive coil, the drive coil is fixed to the housing outside the magnetic circuit system, the magnetic circuit system at least includes a yoke protruding outward, and the yoke is elastically connected to the housing; A sound generating unit, the sound generating unit is arranged in the housing and comprises a vibration system matched with the magnetic circuit system; the vibration system is elastically connected to the housing and has the same vibration direction as the magnetic circuit system; a first limit block, the first limit block being disposed between the magnetic yoke and the first extension portion of the housing and located at a side of the protruding portion of the magnetic yoke close to the vibration system; It also includes a second limit block, which is arranged between the yoke and the housing and is located on a side of the yoke away from the vibration system; The thickness of the first limiting block and / or the second limiting block satisfies the following formula: X f *(1-σ)+X max ≤X p , Among them, X f is the thickness of the first stopper or the second stopper, σ is the compression ratio of the first stopper or the second stopper, X max is the maximum displacement of the vibration motor in the vibration direction, X p Reserve vibration space for the shell in the corresponding vibration direction; The vibration system includes a voice coil, the bottom end of which is connected to the middle shell via a centering support plate; four centering support plates are arranged along two diagonal corners of the middle shell and are respectively connected to the second extension portions formed by extending inwardly from the diagonal corners of the middle shell.

2. The sound-generating vibration device according to claim 1, characterized in that: The first limiting block and the second limiting block may be made of foam and / or rubber material.

3. The sound-generating vibration device according to claim 1, characterized in that: The magnetic circuit system further includes side magnets and a center magnet disposed on the magnetic yoke, and a magnetic gap is formed between the side magnets and the center magnet.

4. The sound-generating vibration device according to claim 3, characterized in that: A first extending portion is extended inwardly from the side wall of the shell, a first protruding portion is protruded outwardly from the outer edge of the magnetic yoke, and the first limiting block is arranged between the first extending portion and the upper surface of the first protruding portion.

5. The sound-generating vibration device according to claim 4, characterized in that: The first extension part is located at two ends of the shell, and the first protruding part is located at two ends of the yoke; there are two first limit blocks, which are respectively arranged between the first extension part and the first protruding part at two ends of the magnetic circuit system.

6. The sound-generating vibration device according to claim 3, characterized in that: There are a plurality of the second limit blocks, and the plurality of the second limit blocks are evenly arranged on the bottom surface of the shell and matched with the lower surface of the yoke.

7. The sound-generating vibration device according to claim 3, characterized in that: The magnetic circuit system further includes a first magnetic conductive plate and a second magnetic conductive plate. The first magnetic conductive plate is disposed on the upper surface of the central magnet, and there are two second magnetic conductive plates, which are disposed on the upper surfaces of the two side magnets.

8. An electronic device, characterized in that: The invention comprises a sound-generating vibration device as described in any one of claims 1 to 7.

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