Sound production unit and electronic device

Abstract

The utility model discloses a kind of sound production monomer and electronic equipment, including shell, magnetic circuit system and vibration system;Magnetic circuit system includes center magnetic part and annular and has four corner edge magnetic part;Vibration system includes diaphragm, voice coil and centering component, voice coil has lead part;Centering component includes the centering branch piece installed in corner outside, centering branch piece includes fixed part, cantilever part and transition part, fixed part is fixedly connected with shell, cantilever part includes first cantilever and second cantilever, first cantilever is connected with lead part, shell is respectively provided with first avoiding part and second avoiding part on corresponding second cantilever and transition part. According to the sound production monomer of the utility model, by setting annular edge magnetic part, centering branch piece is located in the corner outside of edge magnetic part, can increase the volume of magnetic circuit system;By setting second cantilever and transition part along the vibration direction of vibration system and shell relative, shell sets corresponding avoiding, increase the cantilever length of centering branch piece, prolong service life.

Description

Technical Field

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

[0002] In recent years, with the development of technology and the increasing integration of electronic products, the requirements for speaker size have become increasingly stringent. Given the limitations imposed by product structure and size, how to improve product lifespan and reliability margins has become a crucial technical challenge.

[0003] In existing technologies, the commonly used speaker centering support is designed with a cantilever placed inside the product, such as a C-shape, with a basic axially symmetrical structure. The disadvantage is that this type of centering support occupies the volume of other internal components of the product, such as the volume of the magnet, which leads to a reduction in the product's magnetic energy product and a decrease in product performance. This results in a low BL value (magnetic force value), low sensitivity, poor consumer experience, and reduced product competitiveness.

[0004] Furthermore, with increasingly smaller and more compact structures required for loudspeakers, and products with higher levels of integration, the space utilization of the centering bracket is severely limited. This results in a smaller design space for the centering bracket, leading to insufficient length of the cantilever (i.e., the vibrating part) and inadequate deformation in current designs. After fatigue testing or long-term use, the insufficient length and deformation of the cantilever (i.e., the vibrating part) of the centering bracket can easily cause cracks in the conductive layer, eventually leading to the breakage of the conductive layer on the cantilever and thus affecting the speaker's lifespan. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a sound-generating unit.

[0006] To solve the above-mentioned technical problems, the first technical solution of this utility model is: a sound-generating unit, comprising:

[0007] case;

[0008] A magnetic circuit system is fixed to the housing. The magnetic circuit system includes a central magnetic part and a side magnetic part surrounding the outer periphery of the central magnetic part. A magnetic gap is provided between the central magnetic part and the side magnetic part. The side magnetic part is formed into a square structure and has four corners.

[0009] A vibration system, comprising a diaphragm, a voice coil, and a centering assembly, wherein the voice coil has a lead portion, one end of the voice coil is correspondingly disposed to the magnetic gap, the other end of the voice coil is connected to the diaphragm, and the outer edge of the diaphragm is connected to the housing;

[0010] The centering assembly includes a centering support plate installed on the outer side of the corner portion. The centering support plate includes a fixed portion, a cantilever portion, and a transition portion located between the fixed portion and the cantilever portion. Along the direction from the fixed portion to the cantilever portion, the width of at least a portion of the transition portion gradually decreases. The fixed portion is fixedly connected to the housing. The cantilever portion includes a first cantilever and a second cantilever connected together. The first cantilever is connected to the lead portion. Along the vibration direction of the vibration system, the second cantilever and the transition portion are opposite to the housing. The housing is provided with a first clearance portion and a second clearance portion corresponding to the second cantilever and the transition portion, respectively.

[0011] According to some embodiments of the present invention, the vibration system further includes a support frame, the support frame including a main body and a support leg connected to the main body, the main body being connected to the body of the voice coil, one end of the support leg being connected to the main body, the other end of the support leg extending to the outside of the corner portion, the lead wire being routed along the support leg, and the end of the support leg away from the main body being connected to the cantilever portion.

[0012] In some embodiments of this utility model, the main body is connected to the end of the voice coil near the diaphragm, and the side of the main body away from the voice coil is connected to the diaphragm;

[0013] And / or, the main body is formed into a square structure, the support legs are four in number and are respectively located at the four opposite corners of the main body, and the centering assembly includes four centering support plates, with the four centering support plates corresponding one-to-one with the four support legs;

[0014] And / or, the end of the cantilever portion away from the transition portion is provided with a pad portion, and the pad portion is electrically connected to the lead portion.

[0015] According to some embodiments of the present invention, the first clearance portion includes a first clearance notch that cooperates with the second cantilever;

[0016] The second clearance portion includes a second clearance notch that cooperates with the transition portion. Along the vibration direction of the vibration system, the depth of the second clearance notch is less than the depth of the first clearance notch.

[0017] In some embodiments of this utility model, along the direction from the fixed part to the second cantilever, the depth of the second clearance notch gradually increases or increases in a step-like manner; and / or, the maximum amplitude of the vibration system is Xmax, and the minimum depth of the second clearance notch is not less than 0.15Xmax.

[0018] In some embodiments of this utility model, in the direction from the fixed part to the cantilever part, the sum of the extension lengths of the first clearance notch and the second clearance notch is not less than half the length of the cantilever part.

[0019] According to some embodiments of the present invention, the side magnetic part includes a first connecting edge and a second connecting edge, the side magnetic part includes a first side magnetic part located on the first connecting edge and a second side magnetic part located on the second connecting edge, the first side magnetic part and the second side magnetic part are adjacent to each other and form a clearance gap, and along the vibration direction of the vibration system, the clearance gap is opposite to the lead wire part.

[0020] In some embodiments of this utility model, the first side magnetic portion includes a first magnet portion and a second magnet portion that both extend along the first connecting edge. The second magnet portion is located on the side of the first magnet portion away from the central magnet portion, and the extension length of the second magnet portion is less than the extension length of the first magnet portion. The ends of the second magnet portion do not exceed the ends of the first magnet portion. The second side magnetic portion includes a third magnet portion and a fourth magnet portion that both extend along the second connecting edge. The fourth magnet portion is located on the side of the third magnet portion away from the central magnet portion, and the extension length of the fourth magnet portion is less than the extension length of the third magnet portion. The ends of the fourth magnet portion do not exceed the ends of the third magnet portion. The first magnet portion and the third magnet portion are spaced apart to form the clearance gap.

[0021] In some embodiments of this utility model, the end of the first magnet portion cooperates with the end of the third magnet portion to form a first receiving space for receiving the first cantilever, and the end of the fourth magnet portion cooperates with the third magnet portion to form a second receiving space for receiving the second cantilever and the transition portion;

[0022] And / or, the first magnet portion and the second magnet portion are formed as an integrally molded structure;

[0023] And / or, the third magnet portion and the fourth magnet portion are formed as an integrally molded structure.

[0024] The beneficial effects of this utility model are as follows:

[0025] The sound-generating unit of this utility model includes a housing, a magnetic circuit system, and a vibration system. The magnetic circuit system includes a central magnetic part and a peripheral magnetic part surrounding the central magnetic part, with a magnetic gap between the central magnetic part and the peripheral magnetic part. The peripheral magnetic part is square in shape and has four corners. The vibration system includes a diaphragm, a voice coil, and a centering assembly. The voice coil has a lead wire portion. The centering assembly includes a centering support plate mounted on the outside of the corners. The centering support plate includes a fixed part, a cantilever part, and a transition part located between the fixed part and the cantilever part. Along the direction from the fixed part to the cantilever part, at least a portion of the width of the transition part gradually decreases. The fixed part is fixedly connected to the housing. The cantilever part includes a first cantilever and a second cantilever connected together. The first cantilever is connected to the lead wire portion. Along the vibration direction of the vibration system, the second cantilever and the transition part are opposite to the housing. The housing has first clearance portions corresponding to the second cantilever and the transition part, respectively. The second clearance section; the square-structured edge magnetic part, in conjunction with the centering support plate, is located on the outer corner of the edge magnetic part, so that the centering support plate does not occupy the set volume of the magnetic circuit system, thereby maximizing the design volume of the product's magnetic circuit system. This can improve the BL value of the sound-generating unit, and thus improve the sound-generating sensitivity of the sound-generating unit. At the same time, by setting the second cantilever and the transition part opposite to the shell along the vibration direction of the vibration system, the shell is provided with the first clearance part and the second clearance part respectively corresponding to the second cantilever and the transition part. This can increase the cantilever length of the centering support plate while meeting the amplitude requirements of the vibration system, thereby effectively preventing problems such as breakage of the centering support plate due to insufficient deformation. Moreover, a transition part is provided between the second cantilever and the fixed part. Along the direction from the fixed part to the cantilever part, at least part of the width of the transition part gradually decreases. This transition part achieves a smooth transition between the fixed part and the cantilever part, which can reduce the stress concentration phenomenon of the centering support plate, thereby further extending the service life of the centering support plate.

[0026] The second technical solution of this utility model is: an electronic device, including the sound-generating unit described above. Attached Figure Description

[0027] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0028] Figure 1 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the edge magnetic part according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the centering support plate according to an embodiment of the present invention;

[0031] Figure 4 This is a side view of the housing and centering support plate of an embodiment of the present utility model;

[0032] Figure 5 This is a cross-sectional view of an embodiment of the present utility model;

[0033] Figure 6 This is an exploded view of an embodiment of the present utility model;

[0034] In the diagram: 11-Housing; 12-Diaphragm; 13-Reinforcing part; 21-Voice coil; 22-Lead wire part; 3-Centering support; 31-Fixing part; 32-Transition part; 33-First cantilever; 34-Second cantilever; 35-Pad part; 4-Support frame; 41-Main body; 42-Feet part; 5-Center magnet; 51-Center magnet; 52-Center magnetic guide plate; 53-Magnetic gap; 6-Frame; 7-Side magnet; 71-First side magnet; 711-First magnet part; 712-Second magnet part; 72-Second side magnet; 721-Third magnet part; 722-Fourth magnet part; 73-Corner part; 74-Allowing gap; 81-First clearance part; 82-Second clearance part. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0036] like Figures 1 to 6 As shown, the sound-generating unit according to the first aspect of the present invention includes a housing 11, a magnetic circuit system, and a vibration system; the magnetic circuit system is fixed to the housing 11, the magnetic circuit system includes a central magnetic part 5 and a side magnetic part 7 arranged around the outer periphery of the central magnetic part 5, a magnetic gap 53 is provided between the central magnetic part 5 and the side magnetic part 7, the side magnetic part 7 is formed into a square structure, and the side magnetic part 7 has four corner parts 73;

[0037] The vibration system includes a diaphragm 12, a voice coil 21, and a centering assembly. The voice coil 21 has a lead wire portion 22. One end of the voice coil 21 is correspondingly disposed with the magnetic gap 53, and the other end of the voice coil 21 is connected to the diaphragm 12. The outer edge of the diaphragm 12 is connected to the housing 11.

[0038] The centering assembly includes a centering support plate 3 installed on the outside of the corner portion 73. The centering support plate 3 includes a fixed portion 31, a cantilever portion, and a transition portion 32 located between the fixed portion 31 and the cantilever portion. Along the direction from the fixed portion 31 to the cantilever portion, the width of at least part of the transition portion 32 gradually decreases to reduce stress concentration. The fixed portion 31 is fixedly connected to the housing 11. The cantilever portion includes a first cantilever 33 and a second cantilever 34 connected together. The first cantilever 33 is connected to the lead wire portion 22. Along the vibration direction of the vibration system, the second cantilever 34 and the transition portion 32 are opposite to the housing 11, that is, the second cantilever 34 and the transition portion 32 are located on the same side of the housing 11. The housing 11 is provided with a first clearance portion 81 and a second clearance portion 82 corresponding to the second cantilever 34 and the transition portion 32, respectively.

[0039] Optionally, a notch or slot may be provided on the housing 11 to form a first clearance portion 81 and / or a second clearance portion 82.

[0040] In summary, the square-structured side magnet 7, in conjunction with the centering support 3, is located outside the corner 73 of the side magnet 7. This ensures that the centering support 3 does not occupy the volume of the magnetic circuit system, thus maximizing the design volume of the product's magnetic circuit system. This increases the BL value of the speaker unit and consequently improves its sound sensitivity. Because the side magnet 7 adopts a square-structured ring design, the B value (magnetic flux density) at the corner of the voice coil 21R can be increased, fully utilizing the length of the voice coil 21 line at the corner, further increasing the overall BL value of the product. Simultaneously, by setting the second cantilever 34 and the transition portion 32 opposite to the housing 11 along the vibration direction of the vibration system, the housing 1... A first clearance portion 81 and a second clearance portion 82 are respectively provided for the second cantilever 34 and the transition portion 32. This can increase the cantilever length of the centering support 3 while meeting the amplitude requirements of the vibration system, thereby effectively preventing problems such as breakage of the centering support 3 due to insufficient deformation. Moreover, a transition portion 32 is provided between the second cantilever 34 and the fixed portion 31. Along the direction from the fixed portion 31 to the cantilever portion, the width of at least part of the transition portion 32 gradually decreases. Thus, the transition portion 32 achieves a smooth transition between the fixed portion 31 and the cantilever portion, which can reduce the stress concentration phenomenon of the centering support 3 and further extend the service life of the centering support 3.

[0041] The fixing part 31 of the centering support 3 is fixedly connected to the housing 11. During operation, the amplitude of the transition part 32 and the second cantilever 34 near the fixing part 31 is relatively small. In order to make better use of the internal space of the product and meet the vibration requirements of each part of the centering support 3 during operation, a first clearance part 81 and a second clearance part 82 are respectively provided on the housing 11 corresponding to the second cantilever 34 and the transition part 32. This allows the structure of the centering support 3 to be embedded in the housing 11, and the fixing part 31, the transition part 32 and the second cantilever 34 do not occupy the internal space of the product. The structure of the first cantilever 33 can be appropriately increased, which can effectively prevent the centering support 3 from breaking due to insufficient deformation. Moreover, the gradual width design of the transition part 32 makes the transition from the fixing part 31 to the cantilever part smooth, reducing the stress on the centering support 3.

[0042] In summary, the structural design of this sound-generating unit can meet the product's reliability margin requirements, effectively extend the product's lifespan, improve the product's sound sensitivity, and simultaneously ensure the product's competitiveness and consumer experience.

[0043] In one specific embodiment, the vibration system further includes a support frame 4, which includes a main body 41 and a support leg 42 connected to the main body 41. The main body 41 is connected to the body of the voice coil 21. One end of the support leg 42 is connected to the main body 41, and the other end of the support leg 42 extends to the outside of the corner portion 73. The lead wire portion 22 is routed along the support leg 42, and the end of the support leg 42 away from the main body 41 is connected to the cantilever portion. Therefore, by providing the support frame 4, the centering support 3 can be connected to the voice coil 21 through the support frame 4 to achieve centering. Moreover, the centering support 3 does not need to extend into the inner side of the magnetic circuit system, thus not occupying the installation space of the magnetic circuit system, thereby increasing the volume of the magnetic circuit system and improving the product's BL value. Furthermore, the lead wire 22 is routed along the foot 42, and the lead wire 22 can be fixed to the inner wall of the foot 42, thereby increasing the fixing strength of the lead wire 22 and reducing the risk of the lead wire 22 breaking during the vibration of the vibration system.

[0044] Furthermore, the main body 41 is connected to the end of the voice coil 21 near the diaphragm 12, and the side of the main body 41 away from the voice coil 21 is connected to the diaphragm 12. Thus, the support frame 4 can not only connect the centering support 3 to the voice coil 21, but also connect the voice coil 21 to the diaphragm 12.

[0045] And / or, the main body 41 is formed into a square structure, the support legs 42 are four in number and are respectively located at the four diagonal positions of the main body 41, the centering assembly includes four centering support plates 3, the four centering support plates 3 are arranged one-to-one with the four support legs 42, thereby achieving the effect of centering the voice coil 21 from the four diagonal positions, thereby improving the vibration stability of the vibration system;

[0046] And / or, the end of the cantilever portion away from the transition portion 32 is provided with a pad portion 35, the pad portion 35 is electrically connected to the lead portion 22, and the fixing portion 31 may also be provided with an external pad, the external pad is electrically connected to an external circuit, thereby the external circuit can achieve electrical connection with the voice coil 21 through the centering support 3.

[0047] Optionally, the vibration system may also include a reinforcing part 13, which is disposed on the inner side of the diaphragm 12 and connected to the diaphragm 12, and the main body 41 of the support frame 4 may be connected to the reinforcing part 13.

[0048] In one specific embodiment, the first clearance portion 81 includes a first clearance notch that mates with the second cantilever 34; the second clearance portion 82 includes a second clearance notch that mates with the transition portion 32. Along the vibration direction of the vibration system, the depth of the second clearance notch is less than the depth of the first clearance notch. Along the direction from the fixing portion 31 to the second cantilever 34, the depth of the second clearance notch gradually increases or increases in a step-like manner. The maximum amplitude of the vibration system is Xmax, and the minimum depth of the second clearance notch is not less than 0.15Xmax.

[0049] Understandably, to ensure the stress of the centering support 3 is within a safe range, the amplitude of the portion of the centering support 3 near the fixed part 31 is smaller than the amplitude of the cantilever part. Therefore, the depth of the second clearance portion 82 of the housing 11 corresponding to the transition part 32 is less than the depth of the first clearance portion 81 corresponding to the second cantilever 34. The clearance portion composed of the first clearance portion 81 and the second clearance portion 82 can be a stepped transition, a sloped transition, or an integral transition, depending on the application scenario. The clearance portion can be separate and integrated with the housing 11 through welding, gluing, or other methods, or a notch clearance design can be made on the housing 11. The housing 11 can be made of polymer injection molding, metal, or other materials that meet the requirements. Furthermore, as analyzed above, since the amplitude of the portion of the centering support 3 near the fixed part 31 is smaller than the amplitude of the cantilever part, by setting the minimum depth of the second clearance notch to be no less than 0.15Xmax, it can be ensured that the centering support 3 and the second clearance portion 82 do not collide during vibration, meeting the actual usage requirements.

[0050] In one specific embodiment, from the fixing part 31 to the cantilever part, the sum of the extension lengths of the first clearance notch and the second clearance notch is not less than half the length of the cantilever part. This ensures sufficient space is provided to avoid vibration interference between the centering support 3 and the housing 11.

[0051] In one specific embodiment, the side magnetic part 7 includes a first connecting edge and a second connecting edge. The side magnetic part 7 includes a first side magnetic part 71 located on the first connecting edge and a second side magnetic part 72 located on the second connecting edge. The first side magnetic part 71 and the second side magnetic part 72 are adjacent to each other and form a clearance gap 74. Along the vibration direction of the vibration system, the clearance gap 74 is opposite to the lead wire part 22.

[0052] The first side magnetic portion 71 includes a first magnet portion 711 and a second magnet portion 712, both extending along the first connecting edge. The second magnet portion 712 is located on the side of the first magnet portion 711 away from the central magnet portion 5, and the extension length of the second magnet portion 712 is less than the extension length of the first magnet portion 711. The ends of the second magnet portion 712 do not exceed the ends of the first magnet portion 711. The second side magnetic portion 72 includes a third magnet portion 721 and a fourth magnet portion 722, both extending along the second connecting edge. The fourth magnet portion 722 is located on the side of the third magnet portion 721 away from the central magnet portion 5, and the extension length of the fourth magnet portion 722 is less than the extension length of the third magnet portion 721. The ends of the fourth magnet portion 722 do not exceed the ends of the third magnet portion 721. The first magnet portion 711 and the third magnet portion 721 are spaced apart to form the clearance gap 74.

[0053] The end of the first magnet part 711 and the end of the third magnet part 721 cooperate to form a first receiving space for accommodating the first cantilever 33. The end of the fourth magnet part 722 and the third magnet part 721 cooperate to form a second receiving space for accommodating the fixing part 31, the second cantilever 34 and the transition part 32. Through the ingenious arrangement of the structures of the first side magnet part 71 and the second side magnet part 72, a receiving space for the centering support piece 3 can be formed on the outside of the corner 73 of the side magnet part 7. At the same time, the ring design of the side magnet part 7 can be realized, thereby improving the BL value of the product.

[0054] And / or, the first magnet portion 711 and the second magnet portion 712 are formed as an integral structure;

[0055] And / or, the third magnet portion 721 and the fourth magnet portion 722 are formed as an integral structure.

[0056] The integrated structure of the first magnet part 711, the second magnet part 712, the third magnet part 721, and the fourth magnet part 722 can reduce assembly steps and improve efficiency.

[0057] Alternatively, the first magnet part 711 and the second magnet part 712 can also be separate structures, with the two parts bonded together by adhesive; or the third magnet part 721 and the fourth magnet part 722 can also be separate structures, with the two parts bonded together by adhesive.

[0058] The central magnetic section 5 includes a central magnet 51 and a central magnetic guide plate 52, and a frame 6 is installed on the side of the magnetic circuit system away from the voice coil 21.

[0059] The side magnetic part 7 in the above magnetic circuit system makes full use of the limited space inside the housing 11. Through optimized design, the optimal magnetic circuit volume is obtained, which improves the overall BL value of the product and enhances the performance of the sound-generating unit.

[0060] An electronic device according to a second aspect of the present invention includes a sound-generating unit according to the above embodiments of the present invention. Optionally, the electronic device may be a mobile phone, a tablet, a television, headphones, a smart wearable device, etc.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sound-emitting monomer, characterized in that, include: case; A magnetic circuit system is fixed to the housing. The magnetic circuit system includes a central magnetic part and a side magnetic part surrounding the outer periphery of the central magnetic part. A magnetic gap is provided between the central magnetic part and the side magnetic part. The side magnetic part is formed into a square structure and has four corners. A vibration system, comprising a diaphragm, a voice coil, and a centering assembly, wherein the voice coil has a lead portion, one end of the voice coil is correspondingly disposed to the magnetic gap, the other end of the voice coil is connected to the diaphragm, and the outer edge of the diaphragm is connected to the housing; The centering assembly includes a centering support plate installed on the outer side of the corner portion. The centering support plate includes a fixed portion, a cantilever portion, and a transition portion located between the fixed portion and the cantilever portion. Along the direction from the fixed portion to the cantilever portion, the width of at least a portion of the transition portion gradually decreases. The fixed portion is fixedly connected to the housing. The cantilever portion includes a first cantilever and a second cantilever connected together. The first cantilever is connected to the lead portion. Along the vibration direction of the vibration system, the second cantilever and the transition portion are opposite to the housing. The housing is provided with a first clearance portion and a second clearance portion corresponding to the second cantilever and the transition portion, respectively.

2. The sound-generating unit according to claim 1, characterized in that, The vibration system further includes a support frame, which includes a main body and a support leg connected to the main body. The main body is connected to the body of the voice coil. One end of the support leg is connected to the main body, and the other end of the support leg extends to the outside of the corner portion. The lead wire is routed along the support leg, and the end of the support leg away from the main body is connected to the cantilever portion.

3. The sound-generating unit according to claim 2, characterized in that, The main body is connected to the end of the voice coil near the diaphragm, and the side of the main body away from the voice coil is connected to the diaphragm; And / or, the main body is formed into a square structure, the support legs are four in number and are respectively located at the four opposite corners of the main body, and the centering assembly includes four centering support plates, with the four centering support plates corresponding one-to-one with the four support legs; And / or, the end of the cantilever portion away from the transition portion is provided with a pad portion, and the pad portion is electrically connected to the lead portion.

4. The sound-generating unit according to claim 1, characterized in that, The first clearance portion includes a first clearance notch that mates with the second cantilever; The second clearance portion includes a second clearance notch that cooperates with the transition portion. Along the vibration direction of the vibration system, the depth of the second clearance notch is less than the depth of the first clearance notch.

5. The sound-generating unit according to claim 4, characterized in that, Along the direction from the fixed part to the second cantilever, the depth of the second clearance notch gradually increases or increases in a step-like manner; And / or, the maximum amplitude of the vibration system is Xmax, and the minimum depth of the second clearance notch is not less than 0.15Xmax.

6. The sound-generating unit according to claim 4, characterized in that, In the direction from the fixed part to the cantilever part, the sum of the extension lengths of the first clearance notch and the second clearance notch is not less than half the length of the cantilever part.

7. The sound-generating unit according to any one of claims 1-6, characterized in that, The side magnetic part includes a first connecting edge and a second connecting edge. The side magnetic part includes a first side magnetic part located on the first connecting edge and a second side magnetic part located on the second connecting edge. The first side magnetic part and the second side magnetic part are adjacent to each other and form a clearance gap. Along the vibration direction of the vibration system, the clearance gap is opposite to the lead wire part.

8. The sound-generating unit according to claim 7, characterized in that, The first side magnetic portion includes a first magnet portion and a second magnet portion, both extending along the first connecting edge. The second magnet portion is located on the side of the first magnet portion away from the central magnet portion, and the extension length of the second magnet portion is less than the extension length of the first magnet portion. The ends of the second magnet portion do not exceed the ends of the first magnet portion. The second side magnetic portion includes a third magnet portion and a fourth magnet portion, both extending along the second connecting edge. The fourth magnet portion is located on the side of the third magnet portion away from the central magnet portion, and the extension length of the fourth magnet portion is less than the extension length of the third magnet portion. The ends of the fourth magnet portion do not exceed the ends of the third magnet portion. The first magnet portion and the third magnet portion are spaced apart to form the clearance gap.

9. The sound-generating unit according to claim 8, characterized in that, The end of the first magnet portion and the end of the third magnet portion cooperate to form a first receiving space for receiving the first cantilever, and the end of the fourth magnet portion and the third magnet portion cooperate to form a second receiving space for receiving the second cantilever and the transition portion; And / or, the first magnet portion and the second magnet portion are formed as an integrally molded structure; And / or, the third magnet portion and the fourth magnet portion are formed as an integrally molded structure.

10. An electronic device, characterized in that, The sound-generating monomer includes any one of claims 1-9.

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