Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker which comprises a magnetic circuit assembly, a voice coil, a vibrating diaphragm, an FPC assembly and a top plate. The vibrating diaphragm comprises an outer ring body, an inner ring body and an arched part connected between the outer ring body and the inner ring body; the FPC assembly is connected with the vibrating diaphragm and comprises an annular outer ring part, a middle ring part connected with the outer ring part and an inner ring part connected with the middle ring part, the outer ring part, the middle ring part and the inner ring part are each composed of a multi-layer structure, and the number of layers of the middle ring part is smaller than that of the outer ring part and larger than that of the inner ring part; the top plate is connected with the FPC assembly and the vibrating diaphragm and seals the inner ring body. According to the utility model, the overall FPC assembly design effectively ensures the realization of hardness, compliance, quality and process, so that the condition of mass production is met.

Description

Technical Field

[0001] The utility model relates to the technical field of loudspeakers, in particular to a miniature loudspeaker comprising an FPC. Background Art

[0002] Micro speakers with FPC are commonly used in speaker systems in 3C electronic products. This type of design can improve the speaker's power, amplitude, low-frequency response, and reduce low-frequency distortion. The FPC is designed between the speaker's diaphragm and bracket, and generally uses a single-layer copper foil design. Due to the material and structural design, the overall rigidity is poor and easy to deform, resulting in unbalanced vibration and increased split vibration.

[0003] The current difficulties in optimizing the design of FPC in micro speakers are: first, the design of FPC is limited by the structure and size of the speaker, and it is impossible to achieve a more complex structure and material process; second, due to the performance of currently available materials and process bottlenecks, its strength is not enough and it is easy to deform during vibration, which increases the split vibration and causes loss to the overall performance, reducing the overall efficiency of the speaker; third, due to the limitations of the speaker's structural design and assembly process, it is difficult to achieve compatibility between overall rigidity and compliance, which also increases the difficulty of the assembly process.

[0004] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Utility Model Content

[0005] The utility model aims to provide a miniature loudspeaker, which can make the FPC component compatible with overall rigidity and compliance, while reducing the difficulty of assembly.

[0006] In order to achieve the above-mentioned purpose, the utility model proposes a micro speaker, comprising

[0007] Magnetic circuit components;

[0008] a voice coil, configured to vibrate under the magnetic force of the magnetic circuit assembly;

[0009] A diaphragm connected to the voice coil and vibrating along with the voice coil, the diaphragm comprising an outer ring body, an inner ring body and an arched portion connected between the outer ring body and the inner ring body;

[0010] An FPC component connected to the diaphragm, comprising an annular outer ring portion, a middle ring portion connected to the outer ring portion, and an inner ring portion connected to the middle ring portion, wherein the outer ring portion, the middle ring portion, and the inner ring portion are all composed of a multi-layer structure, and the number of layers of the middle ring portion is less than the number of layers of the outer ring portion, and greater than the number of layers of the inner ring portion; and

[0011] The top plate is connected to the FPC assembly and seals the inner ring body.

[0012] Further, the FPC assembly includes a first insulating layer, a reinforcement layer, a second insulating layer, a conductor layer and a third insulating layer stacked in sequence, the outer circle portion includes part of the first insulating layer, the reinforcement layer, part of the second insulating layer, part of the conductor layer and part of the third insulating layer, the middle circle portion includes part of the first insulating layer, part of the second insulating layer, part of the conductor layer and part of the third insulating layer, and the inner circle portion includes part of the second insulating layer and part of the conductor layer.

[0013] Furthermore, the middle ring part includes an annular ring body located inside the outer ring part and a plurality of connecting ribs connected between the outer ring part and the ring body, the number of the connecting ribs is greater than or equal to two, the outer ring part is connected to the outer ring body, the ring body is connected to the inner ring body, and the inner ring part is electrically connected to the voice coil.

[0014] Furthermore, the first insulating layer and the third insulating layer are PI boards, the second insulating layer is a TPI board, and the reinforcement layer and the conductor layer are copper foil layers.

[0015] Furthermore, the first insulating layer, the reinforcement layer, the second insulating layer, the conductor layer and the third insulating layer are all provided with external brackets, and the outer circle part includes five layers of the external brackets; the first insulating layer, the second insulating layer, the conductor layer and the third insulating layer are all provided with internal brackets and ribs, the internal brackets are connected to the external brackets through the ribs, the circle body includes four layers of the internal brackets, and the connecting ribs include four layers of the ribs; the conductor layer is provided with two oppositely arranged welding points, the welding points are connected to the inner bracket of the conductor layer and are electrically connected to the voice coil, the second insulating layer is provided with an insulating part covering the welding points, and the inner circle part includes the welding points and the insulating part.

[0016] Furthermore, the FPC assembly also includes a lead substrate extending outward from the outer ring portion, and the first insulating layer, the second insulating layer, the conductor layer and the third insulating layer are provided with a lead substrate portion, and the lead substrate includes four layers of the lead substrate portion stacked and connected.

[0017] Furthermore, the outer ring portion and the ring body are rectangular, the number of the connecting ribs is four, and two adjacent sides of the outer ring portion and the ring body are connected by one connecting rib.

[0018] Further, the magnetic circuit assembly includes a lower washer and an inner magnet assembly and an outer magnet assembly connected to the lower washer, a magnetic gap is formed between the inner magnet assembly and the outer magnet assembly, one end of the voice coil is passed through the magnetic gap and surrounds the outside of the inner magnet assembly, and the other end is connected to the diaphragm, and the micro speaker also includes a bracket connected between the outer magnet assembly and the outer ring body;

[0019] The lower washer and the inner magnet assembly are provided with through holes for avoiding the soldering points and the leads of the voice coil, and the leads of the voice coil are arranged corresponding to the soldering points.

[0020] Furthermore, the lower washer includes a body and a convex ring connected to the body, the convex ring is arranged corresponding to the magnetic gap and is wound around the outside of a portion of the inner magnet assembly, and the body and the convex ring adopt an integral structure or a split structure.

[0021] Furthermore, the inner magnet assembly includes an upper washer and an inner magnet stacked in sequence, the upper washer includes a first plate body and a second plate body connected to the first plate body, the second plate body protrudes from the end surface of the first plate body to form a step-like structure, and the second plate body is provided with two first avoidance grooves connected to the through hole, and the lead of the voice coil is arranged corresponding to the first avoidance groove.

[0022] Furthermore, the external magnet assembly includes a plurality of external magnets arranged relative to the internal magnet and an upper ring washer surrounding the outside of the upper washer, the external magnet is connected between the upper ring washer and the lower washer, and the external magnet and the internal magnet are both magnetized along the axial direction of the voice coil, and the magnetization directions are opposite.

[0023] Further, the top plate includes a plane plate and a protruding block arranged on the plane plate, the plane plate and the protruding block adopt an integral structure or a split structure, the protruding block includes a first protruding portion, a second protruding portion and a connecting plate connected between the first protruding portion and the second protruding portion, the first protruding portion, the second protruding portion and the connecting plate adopt an integral structure or a split structure, the height of the connecting plate is lower than the first protruding portion and the second protruding portion to form a recessed area, a second avoidance groove is opened on the connecting plate, and the inner circle portion is located in the second avoidance groove.

[0024] Compared with the prior art, the utility model has the following beneficial effects: the micro-speaker provided by the utility model, the outer ring part of the FPC component is a five-layer structure, which increases the strength and prevents deformation; the middle ring part is a four-layer structure, which reduces the weight while increasing the amplitude and compliance of the speaker; the inner ring part is a double-layer structure, which optimizes the molding process of the FPC component and also optimizes the speaker assembly process and improves the yield; the overall FPC component design effectively guarantees the realization of hardness, compliance, quality and process, making it possible to meet the conditions for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the micro speaker in the utility model;

[0026] Figure 2 It is a cross-sectional view of the micro speaker in the utility model;

[0027] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0028] Figure 4 It is an exploded view of the micro speaker in the utility model;

[0029] Figure 5 It is a top view of the FPC assembly of the micro speaker in the utility model;

[0030] Figure 6 It is an exploded view of the FPC assembly of the micro speaker in the utility model;

[0031] Figure 7 It is another exploded view of the FPC assembly of the micro speaker in the utility model;

[0032] Figure 8 It is a structural schematic diagram of the lower washer of the micro speaker in the utility model;

[0033] Fig. 9 It is a structural schematic diagram of the upper washer of the micro speaker in the utility model;

[0034] Fig.10 A cross-sectional view of the upper washer of the micro speaker in the utility model;

[0035] Fig.11 It is a structural schematic diagram of the top plate of the micro loudspeaker in the utility model. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0037] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] like Figures 1 to 4 As shown, the present application proposes a micro loudspeaker, including a magnetic circuit component 1, a voice coil 2, a diaphragm 3, an FPC component 4 and a top plate 5.

[0040] The voice coil 2 is used to vibrate under the magnetic force of the magnetic circuit assembly 1 .

[0041] The diaphragm 3 is connected to the voice coil 2 and vibrates along with the voice coil 2 . The diaphragm 3 includes an outer ring body 301 , an inner ring body 302 , and an arched portion 303 connected between the outer ring body 301 and the inner ring body 302 . The arched portion 303 arches in a direction away from the FPC assembly 4 .

[0042] like Figure 5 As shown, the FPC component 4 is connected to the diaphragm 3, and includes an annular outer ring portion 415, a middle ring portion 416 connected to the outer ring portion 415, and an inner ring portion 417 connected to the middle ring portion 416. The outer ring portion 415, the middle ring portion 416, and the inner ring portion 417 are all composed of a multi-layer structure, and the number of layers of the middle ring portion 416 is less than the number of layers of the outer ring portion 415, and greater than the number of layers of the inner ring portion 417.

[0043] The top plate 5 is connected to the FPC assembly 4 and the diaphragm 3 , and seals the inner ring body 302 .

[0044] As a preferred embodiment, the FPC assembly 4 includes a first insulating layer 403, a reinforcing layer 404, a second insulating layer 405, a conductor layer 406 and a third insulating layer 407 stacked in sequence, the outer ring portion 415 includes a portion of the first insulating layer 403, a reinforcing layer 404, a portion of the second insulating layer 405, a portion of the conductor layer 406 and a portion of the third insulating layer 407, the middle ring portion 416 includes a portion of the first insulating layer 403, a portion of the second insulating layer 405, a portion of the conductor layer 406 and a portion of the third insulating layer 407, and the inner ring portion 417 includes a portion of the second insulating layer 405 and a portion of the conductor layer 406. Optionally, the first insulating layer 403 and the third insulating layer 407 are PI boards, the second insulating layer 405 is a TPI board, and the reinforcing layer 404 and the conductor layer 406 are copper foil layers.

[0045] The outer ring portion 415 of the FPC component 4 is a five-layer design, which adopts a double-layer copper foil sandwich. This design effectively enhances the strength of the outer ring portion 415 of the FPC component 4, reduces the probability of deformation after the FPC component 4 is formed, and effectively improves the yield of the finished product assembly. The middle ring portion 416 of the FPC component 4 is a four-layer design, which effectively reduces the weight, increases the amplitude and compliance of the speaker, and significantly optimizes the THD. The inner ring portion 417 of the FPC component 4 adopts a double-layer design of pure copper foil plus a layer of PI material, which optimizes the molding process of the FPC component 4 and also optimizes the speaker assembly process and improves the yield. Through the above structure, the design of the overall FPC component 4 effectively guarantees the realization of hardness, compliance, quality and process, so that the FPC component 4 has the conditions for mass production.

[0046] The middle ring part 416 includes an annular ring body 401 located inside the outer ring part 415 and a plurality of connecting ribs 402 connected between the outer ring part 415 and the ring body 401, the number of the connecting ribs 402 is greater than or equal to two, the outer ring part 415 is connected to the outer ring body 301, the ring body 401 is connected to the inner ring body 302, and the inner ring part 417 is electrically connected to the voice coil 2.

[0047] When the voice coil 2 vibrates, it drives the inner ring 302, the middle ring portion 416 and the inner ring portion 417 of the diaphragm 3 to vibrate. Since the arch portion 303 corresponds to the position of the connecting rib 402 and is recessed in a direction away from the connecting rib 402, the connecting rib 402 will not affect the deformation of the diaphragm 3. Furthermore, the multiple connecting ribs 402 can play a good balancing role in the speaker, reduce the split vibration, increase the rigidity, and bring better stability to the vibration system of the speaker.

[0048] Specific: such as Figure 6 and Figure 7As shown, the first insulating layer 403, the reinforcing layer 404, the second insulating layer 405, the conductor layer 406 and the third insulating layer 407 are all provided with an annular outer bracket 408, and the outer ring part is composed of five layers of outer brackets 408; the first insulating layer 403, the second insulating layer 405, the conductor layer 406 and the third insulating layer 407 are all provided with inner brackets 409 and ribs 410, and the inner bracket 409 is connected to the outer bracket 408 through the ribs 410, and the ring body 401 is composed of four layers of inner brackets 409, and the connecting ribs 402 are composed of four layers of ribs 410, wherein the first insulating layer 403 and the second insulating layer 405 are The inner bracket 409 is annular, and the inner bracket 409 of the conductor layer 406 and the third insulating layer 407 includes two U-shaped parts with openings facing each other, and the two U-shaped parts are separated and arranged; two oppositely arranged welding points 411 are provided on the conductor layer 406, and the welding points 411 are connected to the inner bracket 409 of the conductor layer 406 (specifically, one end of each of the two U-shaped parts is provided with a welding point 411, and preferably the two welding points 411 are symmetrically arranged with respect to the center), and are electrically connected to the voice coil 2, and the second insulating layer 405 is provided with an insulating part 412 covering the welding point 411, and the inner circle part 417 is composed of the welding point 411 and the insulating part 412.

[0049] In some embodiments, Figure 6 As shown, the insulating portion 412 may be an integral structure, which is roughly the shape of connecting the non-insulating areas of the two solder joints 411 together, and the two solder joints 411 are covered by one insulating portion 412; in other embodiments, such as Figure 7 As shown, the insulating portion 412 may also adopt a split structure, including two insulating portions 412 , which respectively correspond to the shapes of the insulating regions of the solder joints 411 , and the two insulating portions 412 respectively cover the two solder joints 411 .

[0050] like Figure 5 and Figure 6 As shown, the FPC assembly 4 also includes a lead substrate 413 extending outward from the outer ring portion, and a lead substrate portion 414 is provided on the first insulating layer 403, the second insulating layer 405, the conductor layer 406 and the third insulating layer 407. The lead substrate 413 is composed of four layers of lead substrate portions 414 stacked and connected.

[0051] In some embodiments, Figure 5 and Figure 6As shown, the outer ring portion 415 and the ring body 401 are rectangular, the number of connecting ribs 402 is four, and the two adjacent sides of the outer ring portion 415 and the ring body 401 are connected by a connecting rib 402. It can be understood that the connecting ribs 402 are arranged at four positions of the FPC component 4, and there is a spacing space between the outer ring portion and the ring body 401, which can achieve a better balance. In other embodiments, the number of connecting ribs 402 can also be two or more, for example, when the outer ring portion 415 and the ring body 401 are arranged in a circular ring shape, two or more connecting ribs 402 can be arranged.

[0052] like Figure 2 As shown, the magnetic circuit assembly 1 includes a lower washer 101 and an inner magnet assembly and an outer magnet assembly connected to the lower washer 101, a magnetic gap 102 is formed between the inner magnet assembly and the outer magnet assembly, one end of the voice coil 2 is passed through the magnetic gap 102 and surrounds the outside of the inner magnet assembly, and the other end is connected to the diaphragm 3, and the micro speaker also includes a bracket 6 connected between the outer magnet assembly and the outer ring body 301.

[0053] Furthermore, if Figures 2 to 4 As shown, the lower washer 101 and the inner magnet assembly are provided with a through hole 103 for avoiding the solder joint 411 and the lead 201 of the voice coil 2. The lead 201 of the voice coil 2 protrudes inwardly thereof and is arranged corresponding to the solder joint 411 and is located below the solder joint 411. The through hole 103 can prevent the lead 201 from hitting the magnetic circuit assembly 1, and at the same time, it also has the function of discharging the airflow from the through hole 103, thereby achieving the effect of air circulation.

[0054] like Figure 8 As shown, the lower washer 101 includes a body 1011 and a convex ring 1012 connected to the body 1011. The convex ring 1012 is arranged corresponding to the magnetic gap 102 and is wound around the outside of a portion of the inner magnet assembly. The body 1011 and the convex ring 1012 adopt an integrated structure, and of course a split structure can also be adopted. When the body 1011 and the convex ring 1012 adopt a split structure, the convex ring 1012 is embedded in the body 1011 and is firmly connected. It can be understood that the lower washer 101 adopts a split washer, which can effectively improve the magnetic conductivity and assembly efficiency of the speaker.

[0055] like Figure 2 and Figure 4 As shown, the inner magnet assembly includes an upper washer 104 and an inner magnet 105 which are stacked in sequence. Fig. 9 and Fig.10As shown, the upper washer 104 includes a first plate 1041 and a second plate 1042 connected to the first plate 1041. The second plate 1042 is protruding from the end surface of the first plate 1041 to form a step-like structure. The second plate 1042 is provided with two first avoidance grooves 1043 connected to the through hole 103. Preferably, the depth H of the first avoidance groove 1043 is 0.02-0.1 mm. The lead 204 of the voice coil 2 is arranged corresponding to the first avoidance groove 1043, and the first avoidance groove 1043 is used to achieve the effect of avoiding the lead 204. Figures 2 to 4 As shown, the magnetic circuit assembly 1 further includes an upper ring washer 107 surrounding the outer portion of the upper washer 104 .

[0056] The external magnet assembly includes a plurality of external magnets 106 arranged at intervals relative to the internal magnet 105. In the present embodiment, there are four external magnets 106, which are correspondingly arranged outside the four outer side surfaces of the internal magnet 105. The external magnet 106 and the internal magnet 105 are magnetized along the axial direction of the voice coil 2, and the magnetization directions of the two are opposite. The external magnet 106 is connected between the upper ring washer 107 and the plate-shaped lower washer 101. Through the magnetic conductivity of the upper washer 104, the upper ring washer 107 and the lower washer 101, a magnetic conductive circuit can be formed between the inner magnet 105 and the external magnet 106, thereby improving the utilization rate of the magnetic field and improving the overall driving force and sensitivity.

[0057] like Figure 2 and Fig.11As shown, the top plate 5 includes a plane plate 501 and a protruding block 502 disposed on the plane plate 501. The plane plate 501 and the protruding block 502 are of an integral structure or a split structure. The plane plate 501 seals the ring body 401, and its outer convex edge is connected to the upper surface of the ring body 401. The protruding block 502 is embedded in the ring body 401 to position the ring body 401, and the protruding block 502 is connected to the inner ring body 302 of the diaphragm. The protrusion block 502 includes a first protrusion 5021, a second protrusion 5022 and a connecting plate 5033 connected between the first protrusion 5021 and the second protrusion 5022. The height of the connecting plate 5033 is lower than the first protrusion 5021 and the second protrusion 5022 to form a recessed area. A second avoidance groove 5034 is opened on the connecting plate 5033, and the inner circle part 416 is located in the second avoidance groove 5034 (specifically, the number of the second avoidance grooves 5034 is two, and preferably the two second avoidance grooves 5034 are centrally symmetrically arranged to correspond to the position of the coil 201). Optionally, the first protrusion 5021, the second protrusion 5022 and the connecting plate 5033 can be an integral structure or a split structure. It is understood that the protrusion block 502 is a whole block or is composed of multiple parts. The lead wire 201 of the voice coil 2 extends toward the inside thereof and is located below the solder joint 411 and is arranged corresponding to the solder joint 411. The inner ring part 417 is located in the second avoidance groove 5034. The concave area formed by the connecting plate 5033 increases the bottom effective position, provides a vibration space for the inner ring part 416, and enables the inner ring part 416 to be completely attached to the top plate 5. The effect of avoiding the inner ring part 416 is achieved through the second avoidance groove 5034. It is understood that the top plate 5 adopts a downward-pressed stepped Dome structure, which can optimize the welding process of the FPC component 4, making the processes such as combing the lead wire and bonding the voice coil 2 simpler and more mature, and better optimizing the internal space of the speaker, while effectively reducing the split vibration generated during operation.

[0058] The FPC component 4 is located below the top plate 5. It is understandable that the copper foil of the solder joints of the FPC component 4 is below the top plate 5, which is better optimized than the traditional speaker assembly process, making assembly simpler and reducing the risk of wire breakage.

[0059] The FPC component in the micro speaker provided by the utility model is provided with a plurality of connecting ribs, the number of which is greater than or equal to two, and the plurality of connecting ribs play a good balancing role in the speaker, reduce split vibration and increase rigidity, thus bringing better stability to the vibration system of the speaker, and at the same time optimizes the design of the FPC component, and improves important parameters such as speaker power, maximum amplitude, distortion, etc. without affecting the overall acoustic performance.

[0060] The above are only specific implementations of the present invention, and any improvements made based on the concept of the present invention are considered to be within the protection scope of the present invention.

Claims

1. A micro speaker, characterized in that: include: Magnetic circuit components; a voice coil, configured to vibrate under the magnetic force of the magnetic circuit assembly; A diaphragm connected to the voice coil and vibrating along with the voice coil, the diaphragm comprising an outer ring body, an inner ring body and an arched portion connected between the outer ring body and the inner ring body; An FPC component connected to the diaphragm, comprising an annular outer ring portion, a middle ring portion connected to the outer ring portion, and an inner ring portion connected to the middle ring portion, wherein the outer ring portion, the middle ring portion, and the inner ring portion are all composed of a multi-layer structure, and the number of layers of the middle ring portion is less than the number of layers of the outer ring portion, and greater than the number of layers of the inner ring portion; as well as, The top plate is connected to the FPC assembly and the diaphragm, and seals the inner ring body.

2. The micro-speaker according to claim 1, wherein: The FPC assembly includes a first insulating layer, a reinforcement layer, a second insulating layer, a conductor layer and a third insulating layer stacked in sequence, the outer circle portion includes part of the first insulating layer, the reinforcement layer, part of the second insulating layer, part of the conductor layer and part of the third insulating layer, the middle circle portion includes part of the first insulating layer, part of the second insulating layer, part of the conductor layer and part of the third insulating layer, and the inner circle portion includes part of the second insulating layer and part of the conductor layer.

3. The micro-speaker according to claim 2, characterized in that: The middle ring part includes an annular ring body located inside the outer ring part and a plurality of connecting ribs connected between the outer ring part and the ring body, the number of the connecting ribs is greater than or equal to two, the outer ring part is connected to the outer ring body, the ring body is connected to the inner ring body, and the inner ring part is electrically connected to the voice coil.

4. The micro-speaker according to claim 3, characterized in that: The first insulating layer and the third insulating layer are PI boards, the second insulating layer is a TPI board, and the reinforcement layer and the conductor layer are copper foil layers.

5. The micro-speaker according to claim 4, characterized in that: The first insulating layer, the reinforcement layer, the second insulating layer, the conductor layer and the third insulating layer are all provided with external brackets, and the outer circle part includes five layers of the external brackets; the first insulating layer, the second insulating layer, the conductor layer and the third insulating layer are all provided with internal brackets and ribs, the internal bracket is connected to the external bracket through the ribs, the circle body includes four layers of the internal brackets, and the connecting ribs include four layers of the ribs; the conductor layer is provided with two oppositely arranged welding points, the welding points are connected to the inner bracket of the conductor layer and are electrically connected to the voice coil, the second insulating layer is provided with an insulating part covering the welding points, and the inner circle part includes the welding points and the insulating part.

6. The micro-speaker according to claim 5, characterized in that: The FPC assembly also includes a lead substrate extending outward from the outer ring portion, and the first insulating layer, the second insulating layer, the conductor layer and the third insulating layer are provided with a lead substrate portion, and the lead substrate includes four layers of the lead substrate portion stacked and connected.

7. The micro-speaker according to claim 3, characterized in that: The outer ring part and the ring body are rectangular, the number of the connecting ribs is four, and two adjacent sides of the outer ring part and the ring body are connected by one connecting rib.

8. The micro-speaker according to claim 5, characterized in that: The magnetic circuit assembly includes a lower washer and an inner magnet assembly and an outer magnet assembly connected to the lower washer, a magnetic gap is formed between the inner magnet assembly and the outer magnet assembly, one end of the voice coil is passed through the magnetic gap and surrounds the outside of the inner magnet assembly, and the other end is connected to the diaphragm, and the micro speaker also includes a bracket connected between the outer magnet assembly and the outer ring body; The lower washer and the inner magnet assembly are provided with through holes for avoiding the soldering points and the leads of the voice coil, and the leads of the voice coil are arranged corresponding to the soldering points.

9. The micro-speaker according to claim 8, characterized in that: The lower washer comprises a body and a convex ring connected to the body, the convex ring is arranged corresponding to the magnetic gap and is wound around the outside of a portion of the inner magnet assembly, and the body and the convex ring adopt an integral structure or a split structure.

10. The micro-speaker according to claim 9, characterized in that: The inner magnet assembly includes an upper washer and an inner magnet stacked in sequence, the upper washer includes a first plate body and a second plate body connected to the first plate body, the second plate body protrudes from the end surface of the first plate body to form a step-like structure, the second plate body is provided with two first avoidance grooves connected to the through hole, and the lead of the voice coil is arranged corresponding to the first avoidance groove.

11. The micro-speaker according to claim 10, wherein: The external magnet assembly includes a plurality of external magnets arranged relative to the internal magnet and an upper ring washer surrounding the outside of the upper washer. The external magnet is connected between the upper ring washer and the lower washer. Both the external magnet and the internal magnet are magnetized along the axial direction of the voice coil, and the magnetization directions are opposite.

12. The micro-speaker according to any one of claims 3 to 7, characterized in that: The top plate includes a plane plate and a protruding block arranged on the plane plate, and the plane plate and the protruding block adopt an integral structure or a split structure; the protruding block includes a first protruding portion, a second protruding portion and a connecting plate connected between the first protruding portion and the second protruding portion, and the first protruding portion, the second protruding portion and the connecting plate adopt an integral structure or a split structure, the height of the connecting plate is lower than the first protruding portion and the second protruding portion to form a recessed area, and a second avoidance groove is opened on the connecting plate, and the inner circle part is located in the second avoidance groove.

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