A loudspeaker diaphragm structure

Abstract

This utility model relates to the field of loudspeaker technology and discloses a loudspeaker diaphragm structure, including a magnetic circuit assembly, comprising a magnetic iron, the upper end face of which is recessed to form a receiving groove, rare earth magnets, pole pieces, and copper caps being stacked sequentially from the bottom of the receiving groove towards the top of the magnetic iron, and a magnetic permeation gap being provided between the outer periphery of the pole pieces and the inner side of the magnetic iron; a diaphragm, comprising a dome-shaped diaphragm body, the edge of which is bent towards the receiving groove to form a diaphragm fold; a voice coil skeleton, which is fixedly connected to the inner side of the diaphragm fold, with one end of the voice coil skeleton away from the diaphragm fold extending into the magnetic permeation gap; and a suspension edge, which is connected to the edge of the diaphragm body, with one end of the suspension edge away from the diaphragm body being bent in multiple stages and then connected to the top of the magnetic iron; this utility model can effectively absorb and release energy changes during diaphragm vibration, significantly improve the resolution and stability of the loudspeaker in high-frequency and low-frequency responses, and achieve stable operation of the diaphragm in complex acoustic environments.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, and more specifically, to a loudspeaker diaphragm structure. Background Technology

[0002] As an acoustic-to-electroacoustic conversion device, loudspeakers are widely used in consumer electronics, audio systems, communication equipment, and many other fields. Their performance directly affects the sound performance and user experience of the product. The diaphragm structure is one of the key components of a loudspeaker. Driven by the voice coil, it vibrates and pushes air to produce sound. Its dynamic response, frequency characteristics, and stability all have a significant impact on the final sound quality. In practical operation, the diaphragm not only needs to achieve precise back-and-forth reciprocating motion but also needs to have good mechanical compliance and resilience. Therefore, its edge structure is usually provided with suspension edges for flexible support. The suspension edges not only bear the tension transmission during the diaphragm's movement but also affect the loudspeaker's resonant frequency, damping characteristics, and distortion control effect.

[0003] Currently, most mainstream loudspeaker diaphragms adopt a single zigzag or corrugated suspension structure. These loudspeaker diaphragms are generally connected to the diaphragm and support components through a single amplitude suspension bend. In traditional applications, they have a certain degree of technological maturity. However, when dealing with high-speed, long-stroke vibration conditions, their elastic recovery path is singular and the buffer space is insufficient. They are prone to problems such as edge reverse deformation, impact on structural components, and even voice coil displacement when the diaphragm vibrates significantly. Their connection transition area is prone to stress concentration, which leads to increased local fatigue and problems such as high-frequency response hysteresis, low-frequency drooping, or dynamic distortion.

[0004] Therefore, there is a need to provide a loudspeaker diaphragm structure to solve the problem of unstable diaphragm movement in existing loudspeaker diaphragm structures. Utility Model Content

[0005] The main objective of this invention is to provide a loudspeaker diaphragm structure that addresses the technical problems mentioned in the background section.

[0006] The present invention adopts the following technical solution: A loudspeaker diaphragm structure, comprising: A magnetic circuit assembly includes a magnetic iron, the upper end face of which is recessed to form a receiving groove. Rare earth magnets, pole pieces and copper caps are stacked sequentially on the bottom of the receiving groove facing the top of the magnetic iron. A magnetic permeability gap is provided between the outer periphery of the pole piece and the inner side of the magnetic iron. A diaphragm, the diaphragm comprising a dome-shaped membrane body, the edges of the membrane body being bent toward a receiving groove to form a membrane fold; A voice coil skeleton is fixedly connected to the inner side of the diaphragm fold, and the end of the voice coil skeleton away from the diaphragm fold extends into the magnetic permeability gap. The suspension edge is connected to the edge of the membrane body, and the end of the suspension edge away from the membrane body is bent in multiple stages and then connected to the top of the magnet.

[0007] Furthermore, the suspension edge is bent along the outer side of the membrane fold to form a first connecting edge, the first connecting edge is bent vertically toward the side away from the membrane fold to form a second connecting edge, the second connecting edge is raised toward the side away from the membrane fold to form a semi-circular raised arc edge, the opening of the raised arc edge faces the top of the magnetic iron, and the edge of the raised arc edge is connected to the top of the magnetic iron.

[0008] Furthermore, it also includes a fixing bracket, which includes a horizontal portion connected to the top of the magnetic iron, and a vertical portion extending perpendicular to the horizontal portion from one end of the horizontal portion away from the magnetic iron, the vertical portion surrounding the outer periphery of the magnetic iron; The raised arc edge extends away from the membrane fold edge and has a fixed edge. The fixed edge is fixedly connected to the upper end surface of the horizontal part, and the fixed edge and the second connecting edge are distributed on the same horizontal plane.

[0009] Furthermore, the side of the copper cap extends toward the bottom of the receiving groove to the outer periphery of the rare earth magnet, the side of the copper cap covers the pole piece, and the magnetic permeability gap is formed between the side of the copper cap and the inner side of the magnetic permeable iron.

[0010] Furthermore, a voice coil portion is formed around the outer periphery of the voice coil skeleton, and the voice coil portion is disposed within the magnetic permeability gap; The voice coil skeleton has several circular through holes on the side away from the voice coil part along the axial direction, and the several circular through holes are arranged around the voice coil skeleton.

[0011] Furthermore, the copper cap has a dome-shaped protrusion at one end facing the diaphragm, and the top surface of the dome protrusion is proportionally smaller than the top surface of the diaphragm.

[0012] Furthermore, the bottom end of the fixed bracket extends to a connecting portion, and a rectangular connecting groove is provided at the end of the connecting portion away from the magnetic conductor. Mounting holes distributed radially along the magnetic conductor are provided in the connecting groove, and an L-shaped connecting piece is snapped into the mounting hole. The bottom end of the connecting piece extends to the bottom of the connecting portion.

[0013] Furthermore, the connecting groove includes two slots, and the upper end face of the fixed bracket is provided with a positioning groove corresponding to the connecting groove. The positioning groove is connected to the upper end face of the magnetic iron, and the outer peripheral side of the fixed bracket is provided with a plurality of positioning slots along the axial direction. The plurality of positioning slots are distributed in an array along the outer peripheral side of the fixed bracket.

[0014] Beneficial effects: This invention provides a loudspeaker diaphragm structure. By setting a dome-shaped diaphragm body and a diaphragm edge formed by bending its edges towards the receiving groove, the edge of the diaphragm can enhance its rigidity when it reciprocates under the drive of the voice coil, resulting in better high-frequency bandwidth and dynamic stability. The diaphragm edge structure not only improves the mechanical compliance of the diaphragm edge but also reduces stress concentration between the edge and the frame, which helps to improve the linear response capability of the diaphragm. At the same time, the voice coil frame is fixedly connected to the inner side of the diaphragm edge, with one end extending into the magnetic permeability gap, allowing the voice coil to be effectively guided in a controlled magnetic field, improving the accuracy of the vibration response. In addition, by setting a multi-stage bent suspension structure at the edge of the diaphragm, the suspension edge has a longer elastic path and more buffer space as a whole, which can effectively absorb and release energy changes during the diaphragm vibration process. Under the working state of large stroke and wide frequency response, it can stably limit the edge movement amplitude of the diaphragm, suppressing structural collisions and diaphragm deformation caused by excessive displacement, thereby significantly improving the resolution and stability of the loudspeaker in high-frequency and low-frequency responses, and achieving smooth operation of the diaphragm in complex acoustic environments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a loudspeaker diaphragm structure according to the present invention; Figure 2 This is an exploded structural diagram of a loudspeaker diaphragm structure according to the present invention; Figure 3 This is a cross-sectional structural diagram of a loudspeaker diaphragm structure according to the present invention; Figure 4 yes Figure 3 Enlarged structural diagram at point A; in: 1. Magnetic circuit assembly; 11. Magnetic guide iron; 111. Receiving groove; 12. Rare earth magnet; 13. Pole plate; 14. Copper cap; 100. Magnetic guide gap; 2. Diaphragm; 21. Diaphragm body; 22. Diaphragm fold; 3. Voice coil frame; 31. Voice coil part; 32. Circular through hole; 4. Suspension edge; 41. First connecting edge; 42. Second connecting edge; 43. Raised arc edge; 44. Fixed edge; 5. Fixed bracket; 51. Horizontal part; 52. Vertical part; 53. Connecting part; 54. Connecting groove; 55. Mounting hole; 56. Positioning groove; 57. Positioning slot; 6. Dome protrusion; 7. Connecting piece.

[0016] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0017] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] Reference Figures 1 to 4 This utility model proposes a loudspeaker diaphragm 2 structure, comprising: The magnetic circuit assembly 1 includes a magnetic iron 11, the upper end face of which is recessed to form a receiving groove 111. Rare earth magnets 12, pole pieces 13 and copper caps 14 are stacked sequentially on the bottom of the receiving groove 111 toward the top of the magnetic iron 11. A magnetic permeability gap 100 is provided between the outer periphery of the pole piece 13 and the inner side of the magnetic iron 11. The diaphragm 2 includes a dome-shaped membrane body 21, the edge of which is bent toward the receiving groove 111 to form a membrane fold 22; The voice coil skeleton 3 is fixedly connected to the inner side of the diaphragm fold 22, and the end of the voice coil skeleton 3 away from the diaphragm fold 22 extends into the magnetic permeability gap 100. Suspension edge 4 is connected to the edge of the membrane body 21. The end of the suspension edge 4 away from the membrane body 21 is bent in multiple stages and then connected to the top of the magnetic iron 11.

[0022] In the above embodiment, the magnetic circuit assembly 1 has a recessed receiving groove 111 formed on the upper end face of the magnetic iron 11. The bottom of the groove is stacked with rare earth magnets 12, pole pieces 13 and copper caps 14 from bottom to top. A magnetic permeability gap 100 is maintained between the outer periphery of the pole piece 13 and the inner side of the magnetic iron 11 to form a concentrated and stable annular magnetic field. The diaphragm 2 adopts a dome-shaped diaphragm body 21, whose edge is bent inward toward the receiving groove 111 to form a diaphragm fold 22. The diaphragm fold 22 transforms the dome edge from a plane into a three-dimensional cylindrical structure, significantly enhancing edge rigidity and improving stress distribution. It forms the connection area between the edge of the diaphragm 2 and the voice coil skeleton 3. This bending structure not only enhances the overall rigidity of the edge of the diaphragm 2 and maintains better stability under high-frequency excitation, but also has good resilience to ensure the linear response of vibration. The voice coil skeleton 3 is fixed to the inner side of the diaphragm fold 22 by gluing, with its lower end extending into the magnetic permeability gap 100, so that the voice coil is always in a uniform magnetic field guidance during vibration, avoiding sway and improving the linearity of driving force transmission.

[0023] The outer periphery of the diaphragm 2 is integrally connected to the multi-stage bent suspension edge 4. The end of the suspension edge 4 away from the diaphragm 2 is fixed to the top of the magnetic iron 11. The multi-stage bent structure significantly extends the effective elastic length within a limited height, significantly lengthening the elastic recovery path of the diaphragm 2 during vibration and increasing the buffer space. This allows the suspension edge 4 to absorb excess energy from the diaphragm during large dynamic and long-stroke vibrations, thereby effectively suppressing the reverse deformation generated at the edge of the diaphragm and avoiding structural impact and resonance distortion. When the voice coil drives the diaphragm 2 to reciprocate, the diaphragm fold edge 22 first absorbs the radial tensile force transmitted from the dome vibration to the edge, preventing stress concentration and tearing, while maintaining the integrity of the piston movement in the high-frequency range. The multi-stage suspension edge 4 continuously releases energy through stepwise deformation, limiting the lateral sway and longitudinal overshoot of the diaphragm 2 under long strokes, avoiding collisions with the magnetic circuit assembly 1, achieving stable vibration and low distortion output in a wide frequency range, and enabling the speaker to maintain excellent resolution and dynamic stability under high sound pressure and complex signals.

[0024] In one embodiment, the suspension edge 4 is bent along the outer side of the membrane fold 22 to form a first connecting edge 41. The first connecting edge 41 is bent vertically toward the side away from the membrane fold 22 to form a second connecting edge 42. The second connecting edge 42 is raised toward the side away from the membrane fold 22 to form a semi-circular raised arc edge 43. The opening of the raised arc edge 43 faces the top of the magnetic iron 11, and the edge of the raised arc edge 43 is connected to the top of the magnetic iron 11.

[0025] In the above embodiment, the suspension edge 4 starts from the outside of the membrane fold edge 22, first bending downwards to form a first connecting edge 41. This edge is initially fixed close to the outer edge of the diaphragm 2. Then, the first connecting edge 41 is turned horizontally to the outside and bent vertically to form a second connecting edge 42, forming a horizontal transition section of the main body of the suspension edge 4. The outer end of the second connecting edge 42 is raised upwards to form a semi-circular convex arc edge 43. The arc edge opens downwards, and its edge extends directly to the top of the magnetic iron 11. It can be further connected firmly through an intermediate component and by gluing. The entire bending process adopts an integrated hot-pressing molding process to ensure that there is no stress concentration between the connecting edges. The convex arc edge 43 absorbs displacement through arc surface rolling deformation when the diaphragm 2 moves up and down. The first connecting edge 41 and the second connecting edge 42 successively share the radial and lateral stresses, so that the suspension edge 4 as a whole forms a multi-level elastic buffer structure. The connection between the edge and the top of the magnetic iron 11 provides a stable anchor point to prevent the suspension edge 4 from detaching or deforming out of control, and realizes smooth piston movement of the diaphragm 2 under large amplitude.

[0026] In one example, a fixing bracket 5 is also included, the fixing bracket 5 including a horizontal portion 51 connected to the top end of the magnetic iron 11, and a vertical portion 52 extending from the end of the horizontal portion 51 away from the magnetic iron 11, the vertical portion 52 surrounding the outer periphery of the magnetic iron 11; The raised arc edge 43 extends a fixed edge 44 away from the membrane fold edge 22. The fixed edge 44 is fixedly connected to the upper end face of the horizontal part 51, and the fixed edge 44 and the second connecting edge 42 are distributed on the same horizontal plane.

[0027] In the above embodiment, the fixing bracket 5 extends outward from the top of the magnetic iron 11 to form an annular horizontal part 51. The outer edge of the horizontal part 51 is folded down to form a vertical part 52. The vertical part 52 completely surrounds the outer periphery of the magnetic iron 11 to form a closed protective structure. A horizontal fixing edge 44 extends outward from the outer side of the protruding arc edge 43. The fixing edge 44 and the second connecting edge 42 are at the same height plane and are fastened to the upper surface of the horizontal part 51 by adhesive or hot melt. When the bracket is formed, the horizontal part 51 and the vertical part 52 are stamped as an integral structure. Then, the fixed edge 44 is pressed onto the horizontal part 51. The fixed edge 44 and the second connecting edge 42 are in the same plane, so that the suspension edge 4 is evenly distributed. When the diaphragm 2 moves downward, the horizontal part 51 rigidly supports the fixed edge 44 to prevent the arc edge from collapsing excessively. When it moves upward, the micro gap between the fixed edge 44 and the horizontal part 51 allows the arc edge to rebound elastically. The vertical part 52 at the same time blocks external lateral impacts, ensuring that the magnetic circuit and the suspension edge 4 are connected stably, so as to realize the reliable positioning and protection of the diaphragm 2 under various working conditions.

[0028] In one embodiment, the side of the copper cap 14 extends toward the bottom of the receiving groove 111 to the outer periphery of the rare earth magnet 12, the side of the copper cap 14 covers the pole piece 13, and the magnetic permeability gap 100 is formed between the side of the copper cap 14 and the inner side of the magnetic iron 11.

[0029] In the above embodiment, the copper cap 14 extends downward from the top into a cylindrical structure, first completely covering the outer periphery of the pole piece 13, and continuing downward to the outer side of the rare earth magnet 12. A uniform magnetic permeability gap 100 is naturally formed between the side wall of the copper cap 14 and the inner wall of the magnetic permeability iron 11. When the voice coil moves in the magnetic permeability gap 100, the induced current on the side of the copper cap 14 stabilizes the magnetic field distribution, while the part covering the pole piece 13 and the magnet directly conducts heat to the magnetic permeability iron 11 for heat dissipation. When the entire magnetic circuit is assembled, the side of the copper cap 14 is pressed into the inner cavity of the magnetic permeability iron 11 to form a complete gap structure, ensuring magnetic field uniformity and thermal stability, and supporting precise driving of the diaphragm 2.

[0030] In one embodiment, a voice coil portion 31 is formed around the outer periphery of the voice coil skeleton 3, and the voice coil portion 31 is disposed within the magnetic permeability gap 100; The voice coil frame 3 has a plurality of circular through holes 32 on the side away from the voice coil part 31 along the axial direction, and the plurality of circular through holes 32 are arranged around the voice coil frame 3.

[0031] In the above embodiment, the outer periphery of the voice coil skeleton 3 is formed by a surrounding protrusion to form an annular voice coil portion 31. The voice coil portion 31 is placed within the magnetic permeability gap 100 to receive the magnetic field driving force. On the side of the skeleton axially away from the voice coil portion 31, several circular through holes 32 are uniformly stamped, forming an air circulation channel around the skeleton. The skeleton is integrally injection molded from a high-temperature resistant material. When the voice coil portion 31 is wound, the enameled wire is tightly attached to the outer wall of the skeleton to ensure uniform current distribution. The through holes are opened in the upper section of the skeleton to avoid interfering with the magnetic field of the voice coil portion 31. At the same time, during the driving of the diaphragm 2, it allows for rapid air exchange inside the skeleton. The surrounding arrangement of the through holes allows for symmetrical airflow discharge and reduces eddy current noise. When the voice coil portion 31 moves up and down in the gap, the through holes further balance the air pressure inside and outside the skeleton. The entire structure achieves dual heat and air pressure conduction through the through holes, ensuring that the voice coil skeleton 3 stably drives the diaphragm 2 at high power.

[0032] In one embodiment, the copper cap 14 is provided with a dome-shaped dome protrusion 6 at one end facing the diaphragm 2, and the top surface of the dome protrusion 6 is proportionally smaller than the top surface of the diaphragm 2.

[0033] In the above embodiment, the upper end face of the copper cap 14 is provided with an upwardly raised dome-shaped dome protrusion 6. The top surface of the protrusion is a circular curved surface that is concentric with the top surface of the diaphragm 2 but smaller in size. It directly fits with the bottom surface of the diaphragm 2 to conduct sound waves. The top surface of the protrusion is smaller than the top surface of the diaphragm 2 to ensure that the sound waves diffuse outward from the center to form progressive phase compensation. The dome shape of the dome protrusion 6 also disperses stress to avoid local deformation of the diaphragm 2 and prevents collapse under high sound pressure. There is a sound cavity between the dome protrusion 6 and the bottom surface of the diaphragm 2, which allows relative sliding, further optimizing the high-frequency response and realizing precise acoustic coupling between the diaphragm 2 and the magnetic circuit.

[0034] In one embodiment, the bottom end of the fixed bracket 5 extends to a connecting portion 53. The end of the connecting portion 53 away from the magnetic conductor 11 is provided with a rectangular connecting groove 54. The connecting groove 54 is provided with mounting holes 55 distributed radially along the magnetic conductor 11. An L-shaped connecting piece 7 is engaged in the mounting hole 55. The bottom end of the connecting piece 7 extends to the bottom of the connecting portion 53.

[0035] In the above embodiment, the bottom end of the fixed bracket 5 extends into a connecting part 53, and a rectangular connecting groove 54 is opened at the outer end of the connecting part 53. An installation hole 55 is punched in the groove along the radial direction of the magnetic iron 11. The upper end of the L-shaped connecting piece 7 is inserted into the installation hole 55, and the other end extends downward to the bottom of the connecting part 53 to form an external fixing interface.

[0036] The connecting part 53 and the connecting groove 54 are an integral structure. The connecting piece 7 is pressed into the mounting hole 55 by a snap-fit ​​method. The horizontal section of the connecting piece 7 is close to the bottom of the groove to prevent loosening, and the vertical section extends out of the lower part of the connecting part 53 to facilitate screwing with the outer shell. The rectangular structure of the connecting groove 54 can restrict the rotation of the connecting piece 7. The radial distribution of the mounting holes 55 allows the connecting force to be evenly transmitted along the axis of the magnetic iron 11. When the diaphragm 2 is working, the force on the bracket is transmitted to the connecting piece 7 through the connecting part 53. The L-shaped structure converts the vertical force into a horizontal clamping force, ensuring that the bracket and the magnetic iron 11 are stable as a whole. The exposed part at the bottom of the connecting piece 7 further facilitates the modular assembly of the speaker and realizes reliable external anchoring of the bottom of the bracket.

[0037] In one embodiment, the connecting groove 54 includes two, and the upper end face of the fixed bracket 5 is provided with a positioning groove 56 corresponding to the connecting groove 54. The positioning groove 56 is connected to the upper end face of the magnetic iron 11, and a plurality of positioning slots 57 are provided along the axial direction on the outer periphery of the fixed bracket 5. The plurality of positioning slots 57 are distributed in an array along the outer periphery of the fixed bracket 5.

[0038] In the above embodiment, the bottom end of the fixed bracket 5 is provided with two symmetrical connecting grooves 54, and the upper end face is provided with positioning grooves 56 corresponding to each groove, the grooves connecting downward to the top surface of the magnetic iron 11. A plurality of positioning slots 57 are stamped axially along the outer periphery of the fixed bracket 5 to form a circumferentially distributed elastic snap-fit ​​structure. The depth of the positioning grooves 56 is precisely controlled to the top surface of the magnetic iron 11 for easy gluing and alignment. The array arrangement of the positioning slots 57 forms multiple elastic locking points on the outer wall of the bracket. During assembly, the outer shell snaps into the positioning slots 57 to achieve circumferential locking. The positioning grooves 56 and connecting grooves 54 correspond vertically to ensure the verticality of the bracket. After the top surface of the magnetic iron 11 is glued through the grooves, it forms a closed force-bearing ring with the bracket, ensuring the structural integrity of the speaker in complex installation environments.

[0039] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A loudspeaker diaphragm (2) structure, characterized in that, include: The magnetic circuit assembly (1) includes a magnetic iron (11), the upper end face of which is recessed to form a receiving groove (111), and rare earth magnets (12), pole pieces (13) and copper caps (14) are stacked sequentially on the bottom of the receiving groove (111) facing the top of the magnetic iron (11). A magnetic permeability gap (100) is provided between the outer periphery of the pole piece (13) and the inner side of the magnetic iron (11). The diaphragm (2) includes a dome-shaped membrane body (21), the edge of which is bent toward the receiving groove (111) to form a membrane fold (22). The voice coil skeleton (3) is fixedly connected to the inner side of the diaphragm fold (22), and the end of the voice coil skeleton (3) away from the diaphragm fold (22) extends into the magnetic permeability gap (100); Suspension edge (4), the suspension edge (4) is connected to the edge of the membrane body (21), and the end of the suspension edge (4) away from the membrane body (21) is bent in multiple stages and connected to the top of the magnet (11).

2. The loudspeaker diaphragm (2) structure according to claim 1, characterized in that, The suspension edge (4) is bent along the outside of the membrane fold (22) to form a first connecting edge (41). The first connecting edge (41) is bent vertically toward the side away from the membrane fold (22) to form a second connecting edge (42). The second connecting edge (42) is raised toward the side away from the membrane fold (22) to form a semi-circular raised arc edge (43). The opening of the raised arc edge (43) faces the top of the magnetic iron (11), and the edge of the raised arc edge (43) is connected to the top of the magnetic iron (11).

3. The loudspeaker diaphragm (2) structure according to claim 2, characterized in that, It also includes a fixing bracket (5), which includes a horizontal part (51) connected to the top of the magnetic iron (11), and a vertical part (52) extending from the end of the horizontal part (51) away from the magnetic iron (11) is perpendicular to the horizontal part (51), and the vertical part (52) surrounds the outer periphery of the magnetic iron (11). The raised arc edge (43) extends a fixed edge (44) away from the film fold edge (22), the fixed edge (44) is fixedly connected to the upper end face of the horizontal part (51), and the fixed edge (44) and the second connecting edge (42) are distributed on the same horizontal plane.

4. The loudspeaker diaphragm (2) structure according to claim 1, characterized in that, The side of the copper cap (14) extends toward the bottom of the receiving groove (111) to the outer periphery of the rare earth magnet (12), the side of the copper cap (14) covers the pole piece (13), and the magnetic gap (100) is formed between the side of the copper cap (14) and the inner side of the magnetic iron (11).

5. The loudspeaker diaphragm (2) structure according to claim 1, characterized in that, The voice coil skeleton (3) has a voice coil portion (31) formed around its outer periphery, and the voice coil portion (31) is disposed within the magnetic permeability gap (100); The voice coil skeleton (3) has a plurality of circular through holes (32) on the side away from the voice coil part (31) along the axial direction, and the plurality of circular through holes (32) are arranged around the voice coil skeleton (3).

6. The loudspeaker diaphragm (2) structure according to claim 1, characterized in that, The copper cap (14) has a dome-shaped dome protrusion (6) at one end facing the diaphragm (2), and the top surface of the dome protrusion (6) is proportionally smaller than the top surface of the diaphragm (2).

7. The loudspeaker diaphragm (2) structure according to claim 3, characterized in that, The bottom end of the fixed bracket (5) extends to a connecting part (53). A rectangular connecting groove (54) is provided at the end of the connecting part (53) away from the magnetic conductor (11). Mounting holes (55) are provided in the connecting groove (54) and distributed radially along the magnetic conductor (11). An L-shaped connecting piece (7) is snapped into the mounting hole (55). The bottom end of the connecting piece (7) extends to the bottom of the connecting part (53).

8. The loudspeaker diaphragm (2) structure according to claim 7, characterized in that, The connecting groove (54) includes two. The upper end face of the fixed bracket (5) is provided with a positioning groove (56) corresponding to the connecting groove (54). The positioning groove (56) is connected to the upper end face of the magnetic iron (11). The outer periphery of the fixed bracket (5) is provided with a plurality of positioning slots (57) along the axial direction. The plurality of positioning slots (57) are arranged in an array along the outer periphery of the fixed bracket (5).

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