Sound-producing unit and electronic device

Abstract

The present invention relates to the technical field of electro-acoustic conversion, and relates to a sound-producing unit and an electronic device. The sound-producing unit comprises a housing, and a vibration system and a magnetic circuit system fixedly connected to the housing. The magnetic circuit system comprises a magnetic conductive yoke, and a common magnetic portion, central magnetic portions, and edge magnetic portions disposed on the magnetic conductive yoke. Four edge magnetic portions are provided, and annularly arranged around the common magnetic portion and the central magnetic portions. The vibration system comprises a diaphragm assembly, a series connection portion, two voice coils, and four spiders. The diaphragm assembly is connected to the housing. The two voice coils are arranged side by side, with first ends thereof both connected to the diaphragm assembly and second ends thereof respectively inserted into two magnetic gaps. The series connection portion is arranged on the diaphragm assembly, and the two voice coils are each electrically connected to the series connection portion to be connected in series. By providing the above structure, the direct current resistance of ineffective copper foil can be reduced, thereby lowering the impedance of the sound-producing unit and improving the sound quality of the sound-producing unit; moreover, the driving force factor BL of the sound-producing unit can be increased, thereby enhancing the loudness of the sound-producing unit.

Description

Sound generator and electronic equipment Technical Field

[0001] This invention 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] To meet the high-quality music function requirements of smart mobile devices, related technologies improve sound quality by setting two voice coils side by side in the driver unit. However, how to achieve series connection of the two voice coils to make them have low impedance is a technical problem that urgently needs to be solved.

[0004] Therefore, in order to solve the above-mentioned technical problems, this invention is proposed. Summary of the Invention

[0005] The present invention provides a sound-generating unit and an electronic device, the purpose of which is to optimize the driving force factor BL of the sound-generating unit and realize the series connection of two voice coils to make them have a smaller impedance.

[0006] The present invention provides a sound-generating unit, including a housing and a vibration system and a magnetic circuit system fixed to the housing;

[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. 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.

[0008] The vibration system includes a diaphragm assembly, a series connector, two voice coils, and four centering supports. The four centering supports are respectively located at the four corners of the housing. The diaphragm assembly is connected to the housing. The two voice coils are arranged side by side. The first end of each voice coil is connected to the diaphragm assembly, and the second end is respectively inserted into a magnetic gap. Both ends of each voice coil along the extension direction of the common magnetic part are connected to the corner of the housing through a centering support. The series connector is located on the diaphragm assembly, and the two voice coils are electrically connected to the series connector to be arranged in series.

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

[0010] In one specific embodiment of the present invention, the housing includes two long axis sides and two short axis sides forming an annular shape, the long axis sides and the short axis sides are alternately connected and the connection position is at the corner, the common magnet is arranged parallel to the long axis side, and the series connection part is provided on one side of the diaphragm assembly near one of the short axis ends.

[0011] In one specific embodiment of the present invention, the diaphragm assembly includes a diaphragm and a vibrating plate. The diaphragm includes an inner fixing part, a folded ring part, and an outer fixing part connected sequentially from the inside to the outside. The inner fixing part is connected to the vibrating plate, the outer fixing part is connected to the housing, and the connecting part is disposed on the vibrating plate.

[0012] In one specific embodiment of the present invention, the serial connection portion is an FPCB pad attached to the vibrating plate;

[0013] Alternatively, the connecting portion may be a conductive coating attached to the vibrating plate;

[0014] Alternatively, the connecting part is a conductive adhesive attached to the vibrating plate;

[0015] Alternatively, the connecting part is a wire connected to the diaphragm, and the wire and the two voice coils are made of a single wire.

[0016] In one specific embodiment of the present invention, 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 long axis, 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.

[0017] In one specific embodiment of the present invention, the centering support includes a first connecting portion, a second connecting portion, and a vibrating arm connected between the first connecting portion and the second connecting portion. The first connecting portion is connected to the housing, and the second connecting portion is connected to the voice coil. The series connection portion is provided at one end of the vibration assembly, and the second connecting portions of the two centering supports at the other end of the vibration assembly are provided with spot welding pads. The other leads of the two voice coils are electrically connected to the two spot welding pads respectively.

[0018] In one specific embodiment of the present invention, 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 the side magnetic conductive plates are connected as a whole and connected to the housing.

[0019] In one specific embodiment of the present invention, the serial connection portion is provided at both ends corresponding to the extension direction of the common magnetic portion, and the side magnetic plate corresponding to the serial connection portion is provided with a clearance portion.

[0020] In one specific embodiment of the present invention, the housing is a metal housing.

[0021] A second aspect of the present invention also provides an electronic device comprising the sound-generating unit described in any one of the foregoing embodiments.

[0022] The sound-generating unit provided by this invention features a magnetic circuit system and a vibration system, allowing the magnetic circuit system to drive the vibration system to vibrate and generate sound. Furthermore, by setting four side magnetic sections in the magnetic circuit system, with two corresponding to the short axis, a magnetic field is formed at both the long and short axis ends of the magnetic gap. This ensures that the short axis L of the voice coil is also within the magnetic field, allowing for full utilization of the magnetic field and consequently increasing the driving force factor BL of the sound-generating unit, thus improving its loudness (sensitivity). In addition, by providing a series connection on the diaphragm assembly of the vibration system and connecting the leads of the two voice coils to this connection, not only is the series connection of the two voice coils achieved, but the current transmission path is also reduced, thereby decreasing the DC resistance of the conductive structure, lowering the impedance of the sound-generating unit, and improving its sound quality. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 is a three-dimensional structural diagram of the sound-generating unit in an embodiment of the present invention;

[0025] Figure 2 is a three-dimensional structural diagram of the sound-generating unit in Figure 1 from another perspective;

[0026] Figure 3 is an exploded view of the sound-emitting unit in Figure 1;

[0027] Figure 4 is the front view of Figure 1;

[0028] Figure 5 is a schematic diagram of the cross-sectional structure of AA in Figure 1;

[0029] Figure 6 is a front view of the other structures in the sound-generating unit, excluding the diaphragm assembly;

[0030] Figure 7 is a front view of the other structures in the sound-generating unit, excluding the magnetic yoke;

[0031] Figure 8 is a cross-sectional view of a portion of the structure in the sound-generating unit;

[0032] Figure 9 is a three-dimensional structural diagram of the sound-generating unit in another embodiment of the present invention.

[0033] Explanation of reference numerals in the attached drawings: 100-Sound-generating unit; 10-Housing shell; 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-Spot welding pad; 26-Series connection part; 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; 343-Allowing part. Detailed Implementation

[0034] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Referring to Figures 1-9, the present invention provides a sound-generating unit 100, which includes a housing 10 and a vibration system 20 and a magnetic circuit system 30 fixed to the housing 10. The magnetic circuit system 30 includes a magnetic yoke 31 and a common magnetic part 32, a central magnetic part 33, and side magnetic parts 34 disposed on the magnetic yoke 31. There are two central magnetic parts 33, which are disposed on both sides of the common magnetic part 32, and four side magnetic parts 34, which are 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. System 20 includes a diaphragm assembly 21, a series connector 26, two voice coils 24, and four centering supports 25. The four centering supports 25 are respectively located at the four corners of the housing 10. The diaphragm assembly 21 is connected to the housing 10. The two voice coils 24 are arranged side by side. The first end of each voice coil 24 is connected to the diaphragm assembly 21, and the second end is inserted into a magnetic gap. Both ends of each voice coil 24 along the extension direction of the common magnetic part 32 are connected to the corner of the housing 10 through a centering support 25. The series connector 26 is located on the diaphragm assembly 21, and the two voice coils 24 are electrically connected to the series connector 26 to be arranged in series.

[0039] Specifically, the housing 10 is a rectangular frame, with a receiving cavity formed in the middle of the housing 10. Along its central axis, the housing 10 has opposing first and second side surfaces. The central axis of the housing 10 is in the direction of vibration of the sound-generating unit 100.

[0040] 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.

[0041] In the magnetic circuit system 30, the magnetic yoke 31 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, and the two central magnetic parts 33 are respectively spaced apart 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 is located outside the two central magnetic parts 33, and another pair of side magnetic parts 34 is located at the ends of the common magnetic part 32 and the central magnetic parts 33. In this way, the magnetic circuit system 30 forms two parallel annular magnetic gaps, and each of these magnetic gaps generates a magnetic field. This allows the voice coil 24 of the vibration system 20 to also be in the magnetic field, thus making full use of it. Therefore, it can correspondingly increase the driving force factor BL of the sound-generating unit 100 and increase the loudness (sensitivity) of the sound-generating unit 100.

[0042] The vibration system 20 specifically includes a diaphragm assembly 21, a connecting section 26, 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 in a row in the receiving cavity, with one end of each voice coil 24 connected to the diaphragm assembly 21 and the other end corresponding to the magnetic circuit system 30. Thus, when energized, they are driven by the magnetic circuit system 30, thereby causing the diaphragm assembly 21 to vibrate and produce sound. The four centering supports are respectively located at the four corners of the housing 10, and each centering support is connected between the corner of the first side of the housing 10 and the corresponding voice coil 24, thereby reducing the polarization of the two voice coils 24 in the non-vibration direction. The series connection 26 is located between the two voice coils 24 and is specifically provided in the diaphragm assembly 21. The series connection 26 is electrically connected to the leads of the two voice coils 24 respectively. This not only realizes the series connection of the two voice coils 24, but also reduces the current transmission path, thereby reducing the DC resistance of the conductive structure, reducing the impedance of the sound-generating unit 100, and improving the sound quality of the sound-generating unit 100.

[0043] The sound-generating unit 100 provided in this embodiment of the invention has a magnetic circuit system 30 and a vibration system 20 arranged oppositely. The magnetic circuit system 30 drives the vibration system 20 to vibrate and generate sound. At the same time, by setting four side magnetic parts 34 of the magnetic circuit system 30 and arranging them around the common magnetic part 32 and the central magnetic part 31, a magnetic field is formed throughout the entire magnetic gap. This allows the ends of the voice coils 24 to be in the magnetic field as well, thus making full use of them and increasing the driving force factor BL of the sound-generating unit 100, thereby increasing the loudness (sensitivity) of the sound-generating unit 100. In addition, by setting a series connection part 26 on the diaphragm assembly 21 of the vibration system 20 and connecting the leads of the two voice coils 24 to the series connection part 26, not only is the series connection of the two voice coils 24 realized, but the current transmission path is also reduced, thereby reducing the DC resistance of the conductive structure, reducing the impedance of the sound-generating unit 100, and improving the sound quality of the sound-generating unit 100.

[0044] In one specific embodiment of the present invention, the housing 10 includes two major axes and two minor axes forming a ring, with the major and minor axes alternately connected at corners; a common magnet 32 ​​is arranged parallel to the major axes, and a connecting portion 26 is provided on one side of the diaphragm assembly 21 near one of the minor axes, thus facilitating the winding of the voice coil 24. In this embodiment, the housing is formed as a rectangular frame, thereby making the sound-generating unit a rectangular structure. Of course, in other embodiments, the sound-generating unit 100 can also be formed in other shapes, such as squares or other polygons.

[0045] In one specific embodiment of the present invention, the diaphragm assembly 21 includes a diaphragm 22 and a vibrating plate 23. The diaphragm 22 includes an inner fixing part 221, a folded ring part and an outer fixing part 224 connected sequentially from the inside to the outside. The inner fixing part 221 is connected to the vibrating plate 23, the outer fixing part 224 is connected to the housing 10, and the connecting part 26 is disposed on the vibrating plate 23.

[0046] Specifically, the folded ring portion includes a first folded ring portion 222 and a second folded ring portion 223 connected to each other, with the concave directions of the first folded ring portion 222 and the second folded ring portion 223 arranged opposite to each other; the diaphragm 22 is formed into a ring structure, wherein the inner fixing portion 221 and the outer fixing portion 224 have relative displacement in the direction of their central axis through the first folded ring portion 222 and the second folded ring portion 223, and since the inner fixing portion 221 is connected to the vibrating plate 23 and the outer fixing portion 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 portion 224 is also provided with a flange bent toward one side of the housing 10, which can further improve the connection strength with the housing 10. By providing the first and second folds, the range of the deformation region in the diaphragm 22 can be increased, thereby improving the relative position of the diaphragm 22 in the vibration direction. Conversely, by making the first fold 222 and the second fold 223 recessed towards their respective sides, the height of the folds in the vibration direction can be reduced, thus correspondingly reducing the thickness of the diaphragm assembly 21 and the sound-generating unit 100. The first fold 222 is recessed towards the magnetic circuit system 30, and the second fold 223 is recessed away from the magnetic circuit system 30, thus preventing interference between the diaphragm 22 and the housing 10 during vibration.

[0047] In one specific embodiment of the present invention, the connecting portion 26 is an FPCB pad, conductive coating, or conductive adhesive attached to the vibrating plate 23. This increases the structural diversity of the connecting portion 26, thereby broadening its applicability.

[0048] In one specific embodiment of the present invention, the connecting part 26 is a wire connected to the vibrating plate 23, and the wire and the two voice coils 24 are wound from a single wire. This further enriches the structure of the connecting part 26, reduces the two lead solderings of the two voice coils 24, thereby reducing the assembly steps of the sound-generating unit 100 and improving the assembly efficiency of the sound-generating unit 100.

[0049] In one specific embodiment of the present invention, the diaphragm 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 diaphragm 23; the diaphragm 23 is also provided with three protrusions 231 arranged side by side along the long axis, 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.

[0050] 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.

[0051] In one specific embodiment of the present invention, the centering support 25 includes a first connecting portion 251, a second connecting portion 252, and a vibrating arm 253 connected between the first connecting portion 251 and the second connecting portion 252. The first connecting portion 251 is connected to the housing 10, and the second connecting portion 252 is connected to the voice coil 24 respectively. The series connection portion 26 is provided at one end of the vibration assembly, and the second connecting portions 252 of the two centering supports 25 at the other end of the vibration assembly are provided with spot welding pads 254. The other lead of the two voice coils 24 is electrically connected to the two spot welding pads 254 respectively.

[0052] Specifically, the second connecting portion 252 of the centering support 25 is connected to the outer surface of the second end of the voice coil 24. This reduces the space occupied by the thickness of the centering support 25 on the thickness of the driver 100, thereby allowing the voice coil 24 to have a larger vibration space. By providing spot-welded pads 254 at the second connecting portions 252 of the two centering supports 25 at the short shaft end, the input and output wires of the voice coil 24 can be led out from both sides of the long shaft to the outside of the driver 100.

[0053] The second connection portion 252 includes a recessed portion formed by a downward indentation on the upper surface near the diaphragm assembly 21, corresponding to the position of the spot solder pad 254. By providing the spot solder pad 254 on the upper surface of the second connection portion 252, the influence of the soldering position of the voice coil 24 leads 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 soldering position of the voice coil 24 leads.

[0054] The second connecting portion 252, which has a spot welding pad 254, has a wire through hole. The lead wire of the voice coil 24 passes through the wire through hole to the upper surface of the second connecting portion 252. In this way, the lead wire of the voice coil 24 can be limited by the wire through hole, which is beneficial to the planning of the circuit in the sound-generating unit 100. Optionally, the wire through hole can be a closed circular hole or an open notch.

[0055] In one specific embodiment of the present invention, the common magnetic part 32 includes a common magnet 321 and a common magnetic conductive plate 322 stacked on the common magnet 321, the central magnetic part 33 includes a central magnet 331 and a central magnetic conductive plate 332 stacked on the central magnet 331, and the side magnetic part 34 includes a side magnet 341 and a side magnetic conductive plate 342 stacked on the side magnet 341. The multiple side magnetic conductive plates 342 are connected as one unit and connected to the housing 10.

[0056] 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 long axis 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.

[0057] In one specific embodiment of the present invention, the connecting portion 26 is provided at both ends corresponding to the extension direction of the common magnetic portion 32, and the side magnetic plate 342 corresponding to the connecting portion 26 is provided with a clearance portion 343. Providing the connecting portion 26 in the vibration system 20 will correspondingly increase the thickness of the vibration plate 23, but by providing the clearance portion 343 on the side magnetic plate 342, the increased thickness occupies the vibration space, thereby ensuring the vibration space of the vibration system 20.

[0058] In one specific embodiment of the present invention, 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.

[0059] A second aspect of the present 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 has at least the beneficial effects of the sound-emitting unit 100 described above.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. A sound-emitting monomer, characterized in that, Includes a housing and a vibration system and a magnetic circuit system fixed to the housing; 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. 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, a series connector, two voice coils, and four centering supports. The four centering supports are respectively located at the four corners of the housing. The diaphragm assembly is connected to the housing. The two voice coils are arranged side by side. The first end of each voice coil is connected to the diaphragm assembly, and the second end is respectively inserted into a magnetic gap. Both ends of each voice coil along the extension direction of the common magnetic part are connected to the corner of the housing through a centering support. The series connector is located on the diaphragm assembly, and the two voice coils are electrically connected to the series connector to be arranged in series.

2. The sound-generating unit according to claim 1, characterized in that, The housing includes two long axis sides and two short axis sides that form a ring. The long axis sides and the short axis sides are alternately connected and the connection position is at the corner. The common magnet is arranged parallel to the long axis side. The serial connection part is located on one side of the diaphragm assembly near one of the short axis sides.

3. 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 folded ring part, and an outer fixing part connected sequentially from the inside to the outside. The inner fixing part is connected to the vibrating plate, the outer fixing part is connected to the housing, and the connecting part is disposed on the vibrating plate.

4. The sound-generating unit according to claim 3, characterized in that, The connecting part is an FPCB pad attached to the vibrating plate; Alternatively, the connecting portion may be a conductive coating attached to the vibrating plate; Alternatively, the connecting part is a conductive adhesive attached to the vibrating plate; Alternatively, the connecting part is a wire connected to the diaphragm, and the wire and the two voice coils are made of a single wire.

5. The sound-generating unit according to claim 3, 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 long axis, one of which is located between the two voice coils, and the other two protrusions are located at the center of the two voice coils respectively.

6. The sound-generating unit according to claim 1, characterized in that, The centering support includes a first connecting part, a second connecting part, and a vibrating arm connected between 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 voice coil respectively. The series connection is provided at one end of the vibration assembly, and the second connecting parts of the two centering supports at the other end of the vibration assembly are provided with spot welding pads. The other lead of the two voice coils is electrically connected to the two spot welding pads respectively.

7. 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.

8. The sound-generating unit according to claim 7, characterized in that, The connecting portion is provided at both ends corresponding to the extension direction of the common magnetic portion, and the side magnetic plate corresponding to the connecting portion is provided with a clearance portion.

9. The sound-generating unit according to claim 1, characterized in that, The casing is a metal casing.

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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