Sound production monomer and electronic equipment

Abstract

The utility model belongs to the technical field of electro-acoustic conversion, and particularly relates to a sounding monomer and electronic equipment. The single sounding body comprises a shell, and a vibration system and a magnetic circuit system which are fixedly connected to the shell; the magnetic circuit system comprises a magnetic conductive yoke, and a common magnetic part, a central magnetic part and four side magnetic parts which are arranged on the magnetic conductive yoke, and the four side magnetic parts are arranged around the common magnetic part and the central magnetic part; two side-by-side magnetic gaps are formed among the central magnetic part, the side magnetic parts and the common magnetic part; the vibration system comprises a vibrating diaphragm assembly, two voice coils and four centering support chips, the four centering support chips are arranged at the four corners of the shell respectively, first spot welding pads are arranged on second connecting parts of the two centering support chips located on the same second side, the two first connecting parts are connected into a whole, and the two first spot welding pads are electrically connected. And one lead of each of the two voice coils is electrically connected with one first spot welding pad so as to connect the two voice coils in series. Therefore, the driving force factor BL of the sounding monomer can be improved, and the loudness (sensitivity) of the sounding monomer can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of electroacoustic conversion technology, and specifically relates to a sound-generating unit and electronic device. Background Technology

[0002] With the advent of the mobile internet era, the number of smart mobile devices is constantly increasing. Among these mobile devices, mobile phones are undoubtedly the most common and portable. Currently, mobile phones have a wide variety of functions, one of which is high-quality music playback. The miniature sound-generating device within the mobile phone is one of the essential conditions for realizing this high-quality music playback function.

[0003] Loudness (sensitivity) is a key performance indicator for loudspeakers, and the driving force factor (BL) is a crucial factor affecting loudspeaker sensitivity. Existing parallel dual voice coil loudspeaker designs with five magnets lack a magnet at the short axis position, resulting in a relatively small short axis B value. This leads to a degree of ineffective utilization of the voice coil's short axis L, thus leaving room for optimization and improvement in the driving force factor BL.

[0004] Therefore, in order to solve the above-mentioned technical problems, this utility model is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a sound-generating unit and electronic device to solve the problem that the small B value of the second side of the sound-generating unit in the prior art leads to the ineffective utilization of the second side L of the voice coil to a certain extent.

[0006] The first aspect of this utility model provides a sound-generating unit, including a housing and a vibration system and a magnetic circuit system fixed to the housing; the housing includes two first sides and two second sides forming a ring, the first sides and the second sides being alternately connected and the connection position being a corner;

[0007] The magnetic circuit system includes a magnetic yoke and a common magnetic part, a central magnetic part, and a side magnetic part disposed on the magnetic yoke. The common magnetic part is arranged parallel to the first side. There are two central magnetic parts, which are disposed on both sides of the common magnetic part. There are four side magnetic parts, which are arranged around the common magnetic part and the central magnetic part. Each central magnetic part, together with the side magnetic parts surrounding it and the common magnetic part, forms a magnetic gap. Two magnetic gaps are arranged side by side.

[0008] The vibration system includes a diaphragm assembly, two voice coils, and four centering supports. The diaphragm assembly is connected to the housing. The two voice coils are arranged side by side, with the first end of each voice coil connected to the diaphragm assembly and the second end inserted into a magnetic gap. The four centering supports are located at the four corners of the housing. Each centering support includes a first connecting part, a second connecting part, and a vibrating arm connecting the first connecting part and the second connecting part. The first connecting part is connected to the housing, and the second connecting part is connected to the corresponding voice coil at the corner. The second connecting parts of the two centering supports located on one of the second sides are respectively provided with first spot solder pads, and the two first connecting parts are connected as one unit, and the two first spot solder pads are electrically connected. One lead of each of the two voice coils is electrically connected to one of the first spot solder pads to connect the two voice coils in series.

[0009] The sound-generating unit provided by this utility model may also have the following additional technical features:

[0010] In one specific embodiment of the utility model, in the two centering supports located on the other second side, a second spot welding pad is provided on each of the two second connecting parts, and a third spot welding pad is provided on each of the two first connecting parts. The second spot welding pad and the third spot welding pad of the same centering support are electrically connected, and the other lead of the two voice coils is connected to the two second spot welding pads respectively.

[0011] In one specific embodiment of this utility model, the first side is the major axis and the second side is the minor axis.

[0012] In one specific embodiment of this utility model, the second connecting portion of the centering support is connected to the second end of the voice coil.

[0013] In one specific embodiment of this utility model, an avoidance space is formed between adjacent side magnetic parts to avoid the vibrating arm.

[0014] In one specific embodiment of this utility model, the diaphragm assembly includes a diaphragm and a vibrating plate. The diaphragm includes an inner fixing part, a first folded ring part, a second folded ring part, and an outer fixing part connected sequentially from the inside to the outside. The first folded ring part and the second folded ring part are arranged with their concave directions opposite to each other. The inner fixing part is connected to the vibrating plate, and the outer fixing part is connected to the housing.

[0015] In one specific embodiment of this utility model, the vibrating plate is connected to the side of the inner fixing part facing the magnetic circuit system, and the two voice coils are connected to the vibrating plate; the vibrating plate is also provided with three protrusions arranged side by side along the first side direction, one of the protrusions is located on the two voice coils, and the other two protrusions are respectively located at the center of the two voice coils.

[0016] In one specific embodiment of this utility model, the common magnetic part includes a common magnet and a common magnetic conductive plate stacked on the common magnet, the central magnetic part includes a central magnet and a central magnetic conductive plate stacked on the central magnet, and the side magnetic part includes a side magnet and a side magnetic conductive plate stacked on the side magnet. A plurality of side magnetic conductive plates are connected as a whole and connected to the housing.

[0017] In one specific embodiment of this utility model, the lengths of the two side magnetic parts corresponding to the first side are less than the length of the central magnetic part;

[0018] And / or, the length of the common magnetic part is less than the length of the central magnetic part;

[0019] And / or, the housing is a metal housing.

[0020] The second aspect of this utility model also provides an electronic device, including any of the sound-generating units described above.

[0021] The sound-generating unit provided in this embodiment of the utility model has a magnetic circuit system and a vibration system. The magnetic circuit system drives the vibration system to vibrate and generate sound. At the same time, the vibration system has four centering supports, and the second connecting parts of two centering supports corresponding to the same second side are provided with first spot welding pads. The two first connecting parts are connected as one unit and the two first spot welding pads are electrically connected. In this way, the two voice coils can be connected in series by connecting one lead of the voice coil to the first spot welding pad. In addition, by setting four side magnetic parts of the magnetic circuit system, with two corresponding to the second side, the first side and the second side of the magnetic gap both form a magnetic field. This allows the second side L of the voice coil to also be in the magnetic field, thus making full use of it and correspondingly increasing the driving force factor BL of the sound-generating unit, thereby increasing the loudness (sensitivity) of the sound-generating unit. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of the sound-generating unit in an embodiment of the present utility model;

[0024] Figure 2 for Figure 1 A three-dimensional structural diagram of the central sound-emitting unit from another perspective;

[0025] Figure 3 for Figure 1 Exploded view of the central sound-emitting unit;

[0026] Figure 4 for Figure 1 The main view;

[0027] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure of AA;

[0028] Figure 6 This is a schematic diagram showing the arrangement of the magnetic circuit system, voice coil, and centering support in the sound-generating unit.

[0029] 100 - Sound-producing unit;

[0030] 10 - Shell;

[0031] 20-Vibration system, 21-Diaphragm assembly, 22-Diaphragm, 221-Inner fixing part, 222-First folded ring part, 223-Second folded ring part, 224-Outer fixing part, 23-Vibrating plate, 231-Protrusion, 24-Voice coil, 25-Centering support, 251-First connecting part, 252-Second connecting part, 253-Vibrating arm, 254-First spot welding pad, 255-Second spot welding pad, 256-Third spot welding pad;

[0032] 30 - Magnetic circuit system, 31 - Magnetic yoke, 32 - Common magnetic part, 321 - Common magnet, 322 - Common magnetic plate, 33 - Central magnetic part, 331 - Central magnet, 332 - Central magnetic plate, 34 - Side magnetic part, 341 - Side magnet, 342 - Side magnetic plate. Detailed Implementation

[0033] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0034] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0035] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0036] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would 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 may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0037] Reference Figure 1-6This utility model provides a sound-generating unit 100, including a housing 10 and a vibration system 20 and a magnetic circuit system 30 fixed to the housing 10; the housing 10 includes two first sides and two second sides forming an annular shape, the first sides and the second sides being connected at corners; the magnetic circuit system 30 includes a magnetic yoke 31 and a common magnetic part 32, a central magnetic part 33 and a side magnetic part 34 disposed on the magnetic yoke 31, the common magnetic part 32 being arranged parallel to the first side, two central magnetic parts 33 being disposed on both sides of the common magnetic part 32, and four side magnetic parts 34 being disposed around the common magnetic part 32 and the central magnetic part 33; each central magnetic part 33, together with the side magnetic parts 34 and the common magnetic part 32 surrounding it, forms a magnetic gap, and two magnetic gaps are arranged side by side; the vibration system 20 includes a diaphragm assembly 21, two voice coils 24 and four centering supports 25, the diaphragm assembly 21 being connected to Two voice coils 24 are arranged side by side on the housing 10, with the first end of each voice coil 24 connected to the diaphragm assembly 21 and the second end inserted into a magnetic gap. Four centering supports 25 are arranged at the four corners of the housing 10. Each centering support 25 includes a first connecting part 251, a second connecting part 252, and a vibrating arm 253 connecting the first connecting part 251 and the second connecting part 252. The first connecting part 251 is connected to the housing 10, and the second connecting part 252 is connected to the corresponding voice coil 24 at the corner. The second connecting parts 252 of the two centering supports 25 located on the same second side are provided with first spot welding pads 254, and the two first connecting parts 251 are connected as one unit and the two first spot welding pads 254 are electrically connected. One lead of each of the two voice coils 24 is electrically connected to a first spot welding pad 254 and the two voice coils 24 are connected in series.

[0038] Specifically, the housing 10 is a rectangular frame formed by two first sides and two second sides. The middle part of the housing 10 forms a receiving cavity. Along its central axis, the housing 10 has opposing first and second side surfaces. The connection point between the first and second sides is at the corner of the housing 10, and the thickness direction of the housing 10 is the vibration direction of the sound-generating unit 100.

[0039] The magnetic circuit system 30 is connected to the first side of the housing 10, and the vibration system 20 is connected to the second side of the housing 10. Thus, the magnetic circuit system 30 and the vibration system 20 are arranged opposite to each other and can drive the vibration system 20 to vibrate and produce sound when the vibration system 20 is powered on.

[0040] The vibration system 20 specifically includes a diaphragm assembly 21, two voice coils 24, and four centering supports 25. The outer periphery of the diaphragm assembly 21 is connected to the second side of the housing 10. The two voice coils 24 are arranged side by side in the receiving cavity with their long sides parallel to the first side. The first end of each voice coil 24 is connected to the diaphragm assembly 21, and the other end is set corresponding to the magnetic circuit system 30. Thus, when energized, it is driven by the magnetic circuit system 30 to drive the diaphragm assembly 21 to vibrate and produce sound. The four centering supports are respectively located at the four corners of the housing 10. Each centering support is connected to the corner of the first side of the housing 10 through a first connecting part 251 and to the corresponding voice coil 24 through a second connecting part 252. This reduces the polarization of the two voice coils 24 in the non-vibration direction.

[0041] The second connecting parts 252 of the two centering support plates 25 located on the same second side are respectively provided with first spot welding pads 254, and the two first connecting parts 251 are connected as one unit and the two first spot welding pads 254 are electrically connected. One lead of each of the two voice coils 24 is electrically connected to one of the first spot welding pads 254, so that the two voice coils 24 can be connected in series.

[0042] The magnetic yoke 31 in the magnetic circuit system 30 is a flat plate structure. The common magnetic part 32, the central magnetic part 33 and the side magnetic parts 34 are all strip-shaped and fixed to the side of the magnetic yoke 31 facing the vibration system 20. The common magnetic part 32 is located at the center of the magnetic yoke 31 with its length direction parallel to the first side. The two central magnetic parts 33 are respectively spaced on both sides of the common magnetic part 32. The four side magnetic parts 34 are arranged around the outside of the common magnetic part 32 and the central magnetic parts 33. One pair of side magnetic parts 34 are located on the outside of the two central magnetic parts 33 corresponding to the first side, and another pair of side magnetic parts 34 are located at the ends of the common magnetic part 32 and the central magnetic part 33 corresponding to the second side. Thus, the magnetic circuit system 30 forms two parallel annular magnetic gaps with the length direction parallel to the first side, and both the first and second sides of the magnetic gaps form magnetic fields. This allows the second side L of the voice coil 24 to also be in the magnetic field, thus making full use of it. Therefore, the driving force factor BL of the sound-generating unit 100 can be increased accordingly, thereby increasing the loudness (sensitivity) of the sound-generating unit 100.

[0043] The sound-generating unit 100 provided in this embodiment of the utility model is equipped with a magnetic circuit system 30 and a vibration system 20. The magnetic circuit system 30 drives the vibration system 20 to vibrate and generate sound. At the same time, the vibration system 20 is equipped with four centering supports and the second connecting parts 252 of the two centering supports 25 corresponding to the same second side are provided with first spot welding pads 254. The two first connecting parts 251 are connected as one unit and the two first spot welding pads 254 are electrically connected. In this way, the two voice coils 24 can be connected in series by connecting one lead of each voice coil 24 to the first spot welding pad 254. In addition, by setting four side magnetic parts 34 of the magnetic circuit system 30, with two of them corresponding to the second side, the first side and the second side of the magnetic gap are both formed with magnetic fields. This allows the second side L of the voice coil 24 to also be in the magnetic field, thereby making full use of it and increasing the driving force factor BL of the sound-generating unit 100, thereby increasing the loudness (sensitivity) of the sound-generating unit 100.

[0044] In one specific embodiment of this utility model, a second spot welding pad 255 is provided on the second connecting portion 252 of the two centering support plates 25 located on the other second side, and a third spot welding pad 256 is provided on each of the two first connecting portions 251. The second spot welding pads 255 and the third spot welding pads 256 located in the same centering support plate 25 are electrically connected, and the other lead of the two voice coils 24 is electrically connected to the two second spot welding pads 255 respectively. Specifically, the input wire of one voice coil 24 is electrically connected to the second spot welding pad 255 of one second connecting portion 252, the output wire of the other voice coil 24 is electrically connected to the second spot welding pad 255 of the other second connecting portion 252, and the third spot welding pad 256 is electrically connected to the external circuit, thus realizing the electrical connection between the sound-generating unit 100 and the external structure. Optionally, the third spot welding pad 256 can be provided on the surface of the first connecting portion 251 facing away from the diaphragm assembly 21.

[0045] In one specific embodiment of this utility model, the first side is the major axis and the second side is the minor axis. Thus, the shell in this embodiment is rectangular. Of course, in other embodiments, the lengths of the first and second sides can also be equal, that is, the shell is square.

[0046] In one specific embodiment of this utility model, the second connecting portion 252 of the centering support 25 is connected to the second end of the voice coil 24. Specifically, the second connecting portion can be connected to the bottom surface and the outer surface of the second end of the voice coil 24. By connecting the outer surface of the second end of the voice coil 24 to the second connecting portion 252 of the centering support 25, the centering support 25 can fully support the voice coil 24, thereby ensuring its vibration stability.

[0047] In one specific embodiment of this utility model, the second connecting portion 252 includes an upper surface near the diaphragm assembly 21, with a recessed portion formed by the downward indentation of the upper surface corresponding to the positions of the first spot solder pad 254 and the second spot solder pad 255. By setting the first spot solder pad 254 and the second spot solder pad 255 on the upper surface of the second connecting portion 252, the influence of the welding position of the voice coil 24 lead on the vibration space of the centering support 25 facing the yoke 31 can be reduced. The recessed portion on the upper surface can indicate the welding position of the voice coil 24 lead.

[0048] In one specific embodiment of this utility model, a clearance space is formed between adjacent side magnetic parts 34 to avoid the vibration arm 253. This increases the length of the vibration arm 253 and ensures the performance of the centering support 25.

[0049] In one specific embodiment of this utility model, the diaphragm assembly 21 includes a diaphragm 22 and a vibrating plate 23. The diaphragm 22 includes an inner fixing part 221, a first folded ring part 222, a second folded ring part 223 and an outer fixing part 224 connected sequentially from the inside to the outside. The first folded ring part 222 and the second folded ring part 223 are arranged in opposite directions. The inner fixing part 221 is connected to the vibrating plate 23 and the outer fixing part 224 is connected to the housing 10.

[0050] Specifically, the diaphragm 22 is formed into a ring structure, wherein the inner fixing part 221 and the outer fixing part 224 have relative displacement in the direction of their central axis through the first folded ring part 222 and the second folded ring part 223. Since the inner fixing part 221 is connected to the vibrating plate 23 and the outer fixing part 224 is connected to the second side of the housing 10, the vibrating plate 23 and the housing 10 have relative displacement in the vibration direction. The outer periphery of the outer fixing part 224 is also provided with a flange bent towards one side of the housing 10, which can further improve the connection strength with the housing 10. By setting the first folded ring and the second folded ring, the range of the deformation area in the diaphragm 22 can be increased, thereby increasing the relative displacement of the diaphragm 22 in the vibration direction. By making the first folded ring part 222 and the second folded ring part 223 recessed to opposite sides, the height of the folded ring in the vibration direction can be reduced, thereby correspondingly reducing the thickness of the diaphragm assembly 21 and the sound-generating unit 100. The first folded ring portion 222 is recessed on the side facing the magnetic circuit system 30, and the second folded ring portion 223 is recessed on the side away from the magnetic circuit system 30. This can prevent the diaphragm 22 from interfering with the housing 10 when it vibrates.

[0051] In one specific embodiment of this utility model, the vibrating plate 23 is connected to the side of the inner fixing part 221 facing the magnetic circuit system 30, and the two voice coils 24 are connected to the vibrating plate 23; the vibrating plate 23 is also provided with three protrusions 231 arranged side by side along the first side direction, one protrusion 231 is located between the two voice coils 24, and the other two protrusions 231 are respectively located at the center of the two voice coils 24.

[0052] The strength of the diaphragm 23 can be increased by setting a protrusion 231 on the diaphragm 23. Instead, the two voice coils 24 are connected to the outer periphery of the protrusion 231. This avoids affecting the depth of the two voice coils 24 inserted into the two magnetic gaps due to the setting of the protrusion 231, thereby ensuring the performance of the sound-generating unit 100.

[0053] In one specific embodiment of this utility model, the common magnetic part 32 includes a common magnet 321 and a common magnetic guiding plate 322 stacked on the common magnet 321, the central magnetic part 33 includes a central magnet 331 and a central magnetic guiding plate 332 stacked on the central magnet 331, and the side magnetic part 34 includes a side magnet 341 and a side magnetic guiding plate 342 stacked on the side magnet 341. The multiple side magnetic guiding plates 342 are connected as one unit and connected to the housing 10.

[0054] Specifically, the common magnet 321 and the common magnetic guide plate 322 have the same outer contour, the central magnet 331 has the same outer contour as the central magnetic guide plate 332, the side magnet 341 and the side magnetic guide plate 342 have basically the same outer contour in the first side direction, and the adjacent two side magnetic guide plates 342 are connected to form a ring structure with the same outer contour as the housing 10. The multiple magnetic guide plates thus integrally set are connected to the first side of the housing 10 through the side away from the magnetic guide yoke 31.

[0055] In one specific embodiment of this utility model, the housing 10 is a metal housing 10. Thus, the housing 10 can serve as a magnetically conductive structure to further improve the driving force factor BL value of the magnetic circuit system 30.

[0056] In one specific embodiment of this invention, the lengths of the two side magnetic portions 34 corresponding to the first side are less than the length of the central magnetic portion 33, and / or the length of the shared magnetic portion 32 is less than the length of the central magnetic portion 33. This optimizes the magnetic field of the magnetic circuit system, placing the voice coil in a balanced and stable magnetic field, thereby improving the stability of the diaphragm assembly.

[0057] A second aspect of this invention also provides an electronic device comprising the sound-emitting unit 100 described in any of the above embodiments. Since the electronic device has the sound-emitting unit 100 in all the above embodiments, it also possesses at least the beneficial effects of the sound-emitting unit 100 described above.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sound-emitting monomer, characterized in that, It includes a housing and a vibration system and a magnetic circuit system fixed to the housing; the housing includes two first sides and two second sides forming a ring, the first sides and the second sides being alternately connected and the connection position being a corner; The magnetic circuit system includes a magnetic yoke and a common magnetic part, a central magnetic part, and a side magnetic part disposed on the magnetic yoke. The common magnetic part is disposed parallel to the first side. There are two central magnetic parts, which are disposed on both sides of the common magnetic part. There are four side magnetic parts, which are disposed around the common magnetic part and the central magnetic part. Each central magnetic part, together with the side magnetic parts and the common magnetic part surrounding it, forms a magnetic gap. The vibration system includes a diaphragm assembly, two voice coils, and four centering supports. The diaphragm assembly is connected to the housing. The two voice coils are arranged side by side, with the first end of each voice coil connected to the diaphragm assembly and the second end inserted into a magnetic gap. The four centering supports are located at the four corners of the housing. Each centering support includes a first connecting part, a second connecting part, and a vibrating arm connecting the first connecting part and the second connecting part. The first connecting part is connected to the housing, and the second connecting part is connected to the corresponding voice coil at the corner. The second connecting parts of the two centering supports located on one of the second sides are respectively provided with first spot solder pads, and the two first connecting parts are connected as one unit, and the two first spot solder pads are electrically connected. One lead of each of the two voice coils is electrically connected to one of the first spot solder pads to connect the two voice coils in series.

2. The sound-generating unit according to claim 1, characterized in that, In the two centering supports located on the other second side, a second spot welding pad is provided on each of the two second connecting parts, and a third spot welding pad is provided on each of the two first connecting parts. The second spot welding pad and the third spot welding pad of the same centering support are electrically connected, and the other lead of the two voice coils is connected to the two second spot welding pads respectively.

3. The sound-generating unit according to claim 1, characterized in that, The first side is the major axis, and the second side is the minor axis.

4. The sound-generating unit according to claim 1, characterized in that, The second connecting portion of the centering support is connected to the second end of the voice coil.

5. The sound-generating unit according to claim 1, characterized in that, An obstacle avoidance space is formed between adjacent magnetic parts to avoid the vibrating arm.

6. The sound-generating unit according to claim 1, characterized in that, The diaphragm assembly includes a diaphragm and a vibrating plate. The diaphragm includes an inner fixing part, a first folded ring part, a second folded ring part, and an outer fixing part connected sequentially from the inside to the outside. The first folded ring part and the second folded ring part are arranged with their concave directions opposite to each other. The inner fixing part is connected to the vibrating plate, and the outer fixing part is connected to the housing.

7. The sound-generating unit according to claim 6, characterized in that, The diaphragm is connected to the side of the inner fixing part facing the magnetic circuit system, and the two voice coils are connected to the diaphragm. The diaphragm is also provided with three protrusions arranged side by side along the first side direction, one of the protrusions is located between the two voice coils, and the other two protrusions are respectively located at the center of the two voice coils.

8. The sound-generating unit according to claim 1, characterized in that, The common magnetic part includes a common magnet and a common magnetic guide plate stacked on the common magnet. The central magnetic part includes a central magnet and a central magnetic guide plate stacked on the central magnet. The side magnetic part includes a side magnet and a side magnetic guide plate stacked on the side magnet. A plurality of side magnetic guide plates are connected as a whole and connected to the housing.

9. The sound-generating unit according to claim 1, characterized in that, The lengths of the two side magnetic parts corresponding to the first side are less than the length of the central magnetic part; And / or, the length of the common magnetic part is less than the length of the central magnetic part; And / or, the housing is a metal housing.

10. An electronic device, characterized in that, Includes the sound-generating monomer as described in any one of claims 1-9.

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