Coaxial loudspeaker

Abstract

A coaxial loudspeaker comprises a frame, a magnetic circuit system, a bass vibration system and a treble vibration system, the magnetic circuit system is provided with a cavity, a treble magnetic gap and a bass magnetic gap, the bass vibration system comprises a bass diaphragm and a bass voice coil, and the treble vibration system comprises a treble diaphragm and a treble voice coil. The bass magnetic gap comprises a first magnetic gap and a second magnetic gap, the bass voice coil comprises a first voice coil and a second voice coil, the magnetic circuit system comprises a magnet yoke, a main magnetic part, a first auxiliary magnetic part and a second auxiliary magnetic part, the first voice coil surrounds the main magnetic part, and the second voice coil surrounds the first auxiliary magnetic part and the first voice coil. The main magnetic part comprises a first magnet, a second magnet, a third magnet clamped between the second plate part and the first magnet and a main pole core. The main pole core comprises a first plate part clamped between the first magnet and the second magnet, a second plate part and a wall part, wherein the wall part is inserted between the second magnet and the third magnet and is separated from the second magnet to form a high-pitch magnetic gap.

Description

[Technical field]

[0001] The utility model relates to the field of electroacoustics, in particular to a coaxial loudspeaker. [Background technology]

[0002] A coaxial speaker is a speaker that integrates a tweeter unit and a woofer unit, and the tweeter unit and the woofer unit are coaxially arranged. The sound source of the tweeter unit and the woofer unit of the coaxial speaker can be located at the front of the coaxial speaker, that is, the sound direction of the two speaker units is the same, or located at the front and back of the coaxial speaker, that is, the sound direction of the two speaker units is not the same.

[0003] The coaxial loudspeaker in the related art includes a basin frame, a magnetic circuit system and a bass vibration system fixed on the basin frame, and a treble vibration system, wherein the magnetic circuit system has a cavity, a treble magnetic gap arranged around the cavity, and a bass magnetic gap arranged around the treble magnetic gap, the magnetic circuit system includes a yoke and a main magnetic part fixed on the yoke and surrounded by the bass magnetic gap, the cavity penetrates the yoke and the main magnetic part along the vibration direction, the main magnetic part forms a treble magnetic gap, the treble vibration system includes a treble diaphragm and a treble voice coil, the treble voice coil is inserted into the treble magnetic gap and drives the treble diaphragm to vibrate, the bass vibration system includes a bass diaphragm and a bass voice coil driving the bass diaphragm to vibrate, and the bass voice coil includes three voice coils arranged at intervals along the length direction of the coaxial loudspeaker. Among them, an insert electrically connecting the treble voice coil and the external circuit can be arranged in the cavity; or, when the treble diaphragm and the bass diaphragm are located on different sides of the magnetic circuit system, it can also be used as a sound conduction cavity to conduct the sound emitted by the treble diaphragm to another diaphragm located on the same side as the bass diaphragm so that the coaxial loudspeaker can emit sound on the same side. However, this coaxial speaker has the following defects:

[0004] 1. Insufficient use of the space inside the tweeter voice coil, especially when designing PAD and PC as required by customers, the space inside the tweeter voice coil is generally larger;

[0005] Two or three voice coils are arranged at intervals along the length direction of the coaxial speaker, which will not only make the coaxial speaker too large in length direction, which is not conducive to the miniaturization of the speaker, but also the bass voice coil will cause unbalanced driving of the bass diaphragm in the length and width directions of the coaxial speaker, thus affecting the sound performance.

[0006] Therefore, it is necessary to study a coaxial loudspeaker with a new structure. [Contents of the utility model]

[0007] The utility model provides a coaxial loudspeaker with a novel magnetic circuit structure to solve the problems of insufficient space utilization of the inner side of the tweeter voice coil, excessive size in the length direction and unbalanced driving of the bass diaphragm of the coaxial loudspeaker.

[0008] To achieve the above-mentioned purpose, the utility model provides a coaxial loudspeaker, comprising a basin frame, a magnetic circuit system and a bass vibration system and a treble vibration system fixed on the basin frame, the magnetic circuit system having a cavity, a treble magnetic gap and a bass magnetic gap, the bass vibration system comprising a bass diaphragm and a bass voice coil driving the bass diaphragm to vibrate, the treble vibration system comprising a treble diaphragm and a treble voice coil inserted into the treble magnetic gap and driving the treble diaphragm to vibrate, the bass magnetic gap comprising a first magnetic gap and a second magnetic gap, the bass voice coil comprising a first voice coil and a second voice coil, the magnetic circuit system comprising a yoke and a main magnetic portion, a first secondary magnetic portion and a second secondary magnetic portion fixed on the yoke, the first secondary magnetic portion being arranged around the main magnetic portion and spaced from the main magnetic portion to form the first magnetic gap, the first voice coil being inserted into the first magnetic gap to surround the main magnetic portion, and the second secondary magnetic portion surrounding the first secondary magnetic portion The yoke is provided with a first plate portion and a second plate portion arranged at intervals along the vibration direction of the tweeter diaphragm to form the second magnetic gap, the second voice coil is inserted into the second magnetic gap to surround the first secondary magnetic portion and the first voice coil, the main magnetic portion includes a first magnet, a second magnet and a third magnet arranged on the same side of the first magnet along the vibration direction of the tweeter diaphragm, and a main pole core, the second magnet is arranged around the third magnet, the main pole core includes a first plate portion and a second plate portion arranged at intervals along the vibration direction, and a wall portion connecting the first plate portion and the second plate portion, the wall portion is inserted between the second magnet and the third magnet and is spaced from the second magnet to form the tweeter magnetic gap, the first plate portion is clamped between the first magnet and the second magnet, the third magnet is clamped between the second plate portion and the first magnet, and the cavity passes through the yoke, the first magnet, the third magnet and the second plate portion along the vibration direction.

[0009] As an improvement, the bass diaphragm includes an annular first fold ring, a second fold ring arranged around the first fold ring, and a spherical top connecting the first fold ring and the second fold ring, the inner periphery of the first fold ring is fixed on the magnetic circuit system, and the outer periphery of the second fold ring is fixed on the basin frame, wherein the first voice coil and the second voice coil drive the bass diaphragm to vibrate via the spherical top.

[0010] As an improvement, the bass vibration system also includes a sub-flexible circuit board, which includes a first connecting part clamped between the outer periphery of the second folding ring and the basin frame, a second connecting part connected to the second voice coil, a plurality of elastic arms connecting the first connecting part and the second connecting part, a third connecting part connected to the first voice coil, and a plurality of connecting arms connecting the second connecting part and the third connecting part, wherein the second connecting part, the third connecting part and the connecting arms are all fixed to the dome.

[0011] As an improvement, the second secondary magnetic part is also fixed to the basin frame.

[0012] As an improvement, the first secondary magnetic part is provided with a plurality of avoidance parts for avoiding the plurality of connecting arms.

[0013] As an improvement, the plurality of avoidance portions separate the first auxiliary magnetic part into a plurality of magnetic units.

[0014] As an improvement, both the first magnet and the second magnet are magnetized along the vibration direction, and the first magnet and the second magnet have the same poles facing each other.

[0015] As an improvement, the first magnet and the third magnet have the same magnetizing direction.

[0016] As an improvement, the third magnet is radiantly magnetized, and the magnetization direction of the third magnet is perpendicular to the vibration direction, and the polarity of one end of the third magnet close to the second magnet is the same as the polarity of one end of the first magnet close to the second magnet.

[0017] As an improvement, the third magnet is a continuous annular magnet.

[0018] As an improvement, the third magnet is composed of a plurality of magnets arranged at intervals, and the plurality of magnets are distributed in a ring shape.

[0019] As an improvement, the yoke is fixed to the side of the first magnet facing away from the second magnet, the outer periphery of the tweeter diaphragm is fixed to the side of the second magnet facing away from the first magnet through a frame, and the inner periphery of the first fold ring is clamped between the frame and the second magnet.

[0020] As an improvement, the main magnetic part further comprises a magnetic conductive plate fixed to a side of the second magnet facing away from the first magnet, and an orthographic projection of the magnetic conductive plate on the tweeter diaphragm is located within the range of the tweeter diaphragm.

[0021] As an improvement, an insert is provided in the cavity, and the tweeter voice coil is electrically connected to an external circuit via the insert.

[0022] The beneficial effects of the utility model are as follows: the main magnetic part includes a first magnet, a second magnet and a third magnet arranged on the same side of the first magnet along the vibration direction of the tweeter diaphragm, and a main pole core, the second magnet is arranged around the third magnet, the main pole core includes a first plate portion and a second plate portion arranged at intervals along the vibration direction, and a wall portion connecting the first plate portion and the second plate portion, the wall portion is inserted between the second magnet and the third magnet and is spaced from the second magnet to form a tweeter magnetic gap, the first plate portion is clamped between the first magnet and the second magnet, the third magnet is clamped between the second plate portion and the first magnet, and the cavity passes through the yoke, the first magnet, the third magnet and the second plate portion along the vibration direction. The main magnetic part structure configured in this way can utilize the space inside the tweeter voice coil to maximize the magnetic circuit design to increase the magnetic performance of the magnetic circuit system; at the same time, since the bass magnetic gap includes a first magnetic gap arranged around the main magnetic part and a second magnetic gap arranged around the first magnetic gap, the first voice coil inserted into the first magnetic gap surrounds the main magnetic part and the second voice coil inserted into the second magnetic gap surrounds the first auxiliary magnetic part. The magnetic part system and the bass vibration system configured in this way can not only reduce the size of the speaker in the length direction, but also drive the bass diaphragm through the coaxially arranged and annular first voice coil and second voice coil, which can make the bass diaphragm drive balanced.

Brief Description of the Drawings

[0023] Figure 1 It is a three-dimensional exploded schematic diagram of a coaxial speaker according to an embodiment of the utility model.

[0024] Figure 2 yes Figure 1 Schematic diagram of the structure of the main pole core in the coaxial speaker shown.

[0025] Figure 3 yes Figure 1 The schematic diagram of the structure of the secondary flexible circuit board in the coaxial speaker is shown.

[0026] Figure 4 yes Figure 1 Schematic diagram of the structure of the coaxial loudspeaker after assembly.

[0027] Figure 5 yes Figure 4 The coaxial loudspeaker is shown in a cross-sectional view along line AA, and the cross-sectional view only retains a portion of the two portions that are symmetrical about the dotted line d.

[0028] Figure 6 yes Figure 4 The coaxial loudspeaker is shown in a cross-sectional view along line BB, wherein the cross-sectional view retains only a portion of the two portions symmetrical about the dotted line d.

[0029] Figure 7 It is a cross-sectional view of the coaxial loudspeaker of the second embodiment of the utility model, and the cross-sectional view only retains a part of the two parts symmetrical about the dotted line d.

[0030] Figure 8 It is a top view of the coaxial loudspeaker of Embodiment 3 of the utility model after the tweeter vibration system and the main pole core are removed. [Specific implementation method]

[0031] Combine the following Figures 1 to 8 The utility model is described in detail.

[0032] like Figures 5 to 7 As shown, the thickness direction of the coaxial speaker of the present invention is defined as the vibration direction X, the vibration direction X includes a positive direction and a negative direction, the positive direction of the vibration direction X is defined as the direction indicated by the arrow of the vibration direction X, and the negative direction of the vibration direction X is the direction opposite to the direction indicated by the arrow of the vibration direction X.

[0033] Embodiment 1

[0034] like Figures 1 to 7 As shown, the coaxial speaker of the utility model comprises a basin frame 1, a magnetic circuit system 3 and a bass vibration system 5 and a treble vibration system 7 fixed to the basin frame 1. The bass vibration system 5 surrounds the outer side of the treble vibration system 7 and is coaxially arranged with the treble vibration system 7. The magnetic circuit system 3 drives the bass vibration system 5 to vibrate and emit low-frequency sound, and the magnetic circuit system 3 drives the treble vibration system 7 to vibrate and emit high-frequency sound, so that the frequency band range of the coaxial speaker can be increased by combining the bass vibration system 5 and the treble vibration system 7 to generate sound.

[0035] The basin frame 1 is roughly rectangular, and conductive terminals (not shown) electrically connected to an external circuit are injection-molded on the basin frame 1.

[0036] The magnetic circuit system 3 has a cavity 3A, a high-frequency magnetic gap 3B and a low-frequency magnetic gap 3C.

[0037] The tweeter magnetic gap 3B surrounds the cavity 3A;

[0038] The bass magnetic gap 3C includes a first magnetic gap 3D and a second magnetic gap 3E; wherein,

[0039] The first magnetic gap 3D is arranged around the tweeter magnetic gap 3B;

[0040] The second magnetic gap 3E is arranged around the first magnetic gap 3D.

[0041] It should be noted that the cavity 3A, the tweeter magnetic gap 3B, the first magnetic gap 3D and the second magnetic gap 3E are coaxially arranged.

[0042] The magnetic circuit system 3 includes a yoke 31 , and a main magnetic portion 33 , a first auxiliary magnetic portion 35 , and a second auxiliary magnetic portion 37 fixed to the yoke 31 .

[0043] The tweeter magnetic gap 3B is formed on the main magnetic portion 33 .

[0044] The first auxiliary magnetic portion 35 is disposed around the main magnetic portion 33 and is spaced apart from the main magnetic portion 33 to form a first magnetic gap 3D. That is, the tweeter magnetic gap 3B and the main magnetic portion 33 are both surrounded by the first magnetic gap 3D.

[0045] The second secondary magnetic portion 37 is disposed around the first secondary magnetic portion 35 and is spaced apart from the first secondary magnetic portion 35 to form a second magnetic gap 3E. That is, the first magnetic gap 3D and the first secondary magnetic portion 35 are both surrounded by the second magnetic gap 3E.

[0046] The second secondary magnetic portion 37 is also fixed to the frame 1 so that the magnetic circuit system 3 is fixed to the frame 1 .

[0047] The main magnetic portion 33 includes a first magnet 331 , a second magnet 332 and a third magnet 333 disposed on the same side of the first magnet 331 along the vibration direction X, and a main pole core 334 .

[0048] The second magnet 332 is disposed around the third magnet 333 .

[0049] The main pole core 334 includes a first plate portion 336 and a second plate portion 337 spaced apart from each other in the vibration direction X, and a wall portion 338 connecting the first plate portion 336 and the second plate portion 337 .

[0050] The first plate portion 336 is sandwiched between the first magnet 331 and the second magnet 332 .

[0051] The wall portion 338 is interposed between the second magnet 332 and the third magnet 333 and is spaced apart from the second magnet 332 to form a tweeter magnetic gap 3B.

[0052] The third magnet 333 is sandwiched between the second plate portion 337 and the first magnet 331 .

[0053] The cavity 3A passes through the yoke 31 , the first magnet 331 , the third magnet 333 , and the second plate portion 337 along the vibration direction X.

[0054] like Figure 1 , Figure 5 and Figure 6 As shown, the yoke 31 , the first magnet 331 , the third magnet 333 and the second plate portion 337 are all continuous annular structures.

[0055] It should be noted that the yoke 31 , the first magnet 331 , the third magnet 333 and the second plate portion 337 are coaxially arranged.

[0056] In this embodiment, the first magnet 331 and the second magnet 332 are magnetized along the vibration direction X, and the first magnet 331 and the second magnet 332 are opposite to each other with the same poles, and the first magnet 331 and the third magnet 333 have the same magnetization direction.

[0057] That is, one of the first magnet 331 and the second magnet 332 is magnetized along the positive direction of the vibration direction X, and the other is magnetized along the negative direction of the vibration direction X. Figure 5 and Figure 6 A magnetic pole distribution mode of the first magnet 331 , the second magnet 332 and the third magnet 333 is shown.

[0058] The tweeter vibration system 7 includes a tweeter diaphragm 71 and a tweeter voice coil 73 inserted into the tweeter magnetic gap 3B and driving the tweeter diaphragm 71 to vibrate.

[0059] In this embodiment, if Figure 5 and Figure 6 As shown, the yoke 31 is fixed to the side of the first magnet 331 facing away from the second magnet 332 , and the outer periphery of the tweeter diaphragm 71 is fixed to the side of the second magnet 332 facing away from the first magnet 331 through the frame 8 .

[0060] In this embodiment, the main magnetic portion 33 further includes a magnetic conductive plate 335 fixed to a side of the second magnet 332 facing away from the first magnet 331 .

[0061] The magnetic conductive plate 335 is annular in structure, and the positive projection of the magnetic conductive plate 335 on the tweeter diaphragm 71 is located within the range of the tweeter diaphragm 71 .

[0062] The tweeter diaphragm 71 includes a diaphragm body 711 and a reinforcing plate 713 fixedly disposed on a side of the diaphragm body 711 away from the magnetic circuit system 3 .

[0063] like Figure 5 and Figure 6 As shown, the outer periphery of the membrane 711 is fixed to the side of the second magnet 332 facing away from the first magnet 331 through the frame 8 .

[0064] An insert 9 is provided in the cavity 3A, and the tweeter voice coil 73 is electrically connected to the external circuit via the insert 9 .

[0065] The insert 9 is embedded with a conductive terminal (not shown) for electrically connecting the tweeter voice coil 73 with an external circuit.

[0066] In this embodiment, the tweeter vibration system 7 also includes a main flexible circuit board 75 fixedly mounted on the side of the membrane 711 facing away from the magnetic circuit system 3, the tweeter voice coil 73 is fixed on the main flexible circuit board 75 and electrically connected to the main flexible circuit board 75, and the main flexible circuit board 75 is also electrically connected to the conductive terminal of the insert 9 so that the tweeter voice coil 73 is electrically connected to the conductive terminal of the insert 9 (not shown).

[0067] The bass vibration system 5 includes a bass diaphragm 51 and a bass voice coil 53 for driving the bass diaphragm 51 to vibrate.

[0068] The outer periphery of the bass diaphragm 51 is fixed to the basin frame 1 , and the inner periphery thereof is fixed to the magnetic circuit system 3 .

[0069] like Figure 5 and Figure 6 As shown, the bass diaphragm 51 includes an annular first fold ring 511, a second fold ring 513 arranged around the first fold ring 511, and a spherical top 515 connecting the first fold ring 511 and the second fold ring 513. The inner periphery of the first fold ring 511 is clamped between the second magnet 332 and the frame 8 so that the inner periphery of the first fold ring 511 is fixed on the magnetic circuit system 3, and the outer periphery of the second fold ring 513 is fixed on the basin frame 1.

[0070] It should be noted that the first fold ring 511 , the second fold ring 513 and the tweeter diaphragm 71 are coaxially arranged.

[0071] In this embodiment, the bass diaphragm 51 further includes a weight 517 fixed to the side of the dome 515 away from the bass voice coil 53. The weight 517 is an annular structure.

[0072] The bass voice coil 53 includes a first voice coil 531 and a second voice coil 533. The first voice coil 531 is inserted into the first magnetic gap 3D to surround the main magnetic part 33, and the second voice coil 533 is inserted into the second magnetic gap 3E to surround the first secondary magnetic part 35 and the first voice coil 531. The first voice coil 531 and the second voice coil 533 drive the bass diaphragm 51 to vibrate via the dome 515. That is, the first voice coil 531 and the second voice coil 533 need to be directly or indirectly connected to the dome 515 so that the first voice coil 531 and the second voice coil 533 drive the bass diaphragm 51 to vibrate via the dome 515.

[0073] It should be noted that the first voice coil 531 and the second voice coil 533 are coaxially arranged.

[0074] In this embodiment, the bass vibration system 5 further includes a secondary flexible circuit board 55, which includes a first connection portion 551 clamped between the outer periphery of the second folding ring 513 and the basin frame 1, a second connection portion 553 connected to the second voice coil 533, a plurality of elastic arms 555 connecting the first connection portion 551 and the second connection portion 553, a third connection portion 557 connected to the first voice coil 531, and a plurality of connection arms 559 connecting the second connection portion 553 and the third connection portion 557, wherein the second connection portion 553, the third connection portion 557 and the connection arm 559 are all fixed to the dome 515 so that the first voice coil 531 and the second voice coil 533 are connected to the dome 515 via the secondary flexible circuit board 55. Compared with the bass vibration system with a single voice coil, the bass vibration system 5 with a dual voice coil can not only increase the electromagnetic force, but also the coaxial series design of the dual voice coils in the bass part can more evenly support the bass diaphragm 51.

[0075] That is to say, the outer periphery of the second fold ring 513 is indirectly fixed to the basin frame 1 through the first connecting portion 551 .

[0076] It should be noted that the connection between the second connection portion 553 and the second voice coil 533 and the connection between the third connection portion 557 and the first voice coil 531 both include fixed connection and electrical connection. The first connection portion 551 is also electrically connected to the conductive terminal molded on the frame 1 so that the first voice coil 531 and the second voice coil 533 are electrically connected to the external circuit via the conductive terminal molded on the secondary flexible circuit board 55 and the frame 1.

[0077] The first auxiliary magnetic portion 35 is provided with a plurality of escape portions 35A for escaping the plurality of connection arms 559 .

[0078] The plurality of escape portions 35A divide the first auxiliary magnetic portion 35 into a plurality of magnetic units.

[0079] like Figure 1 As shown, four escape portions 35A are provided, and accordingly, the first auxiliary magnetic portion 35 is divided into four magnetic units.

[0080] Each magnetic unit includes a fourth magnet 351 fixed on the yoke 31 and a first pole core 353 stacked on the fourth magnet 351 .

[0081] The second secondary magnetic part 37 includes a fifth magnet 371 fixed on the yoke 31 and a second pole core 373 fixed on the side of the fifth magnet 371 away from the yoke 31 . The second pole core 373 is also fixed on the frame 1 so that the magnetic circuit system 3 is fixed on the frame 1 .

[0082] The second pole core 373 is a continuous ring structure.

[0083] The fifth magnet 371 is composed of four magnets a arranged at intervals. The four magnets a are distributed in a rectangular shape, and a leakage channel b is formed between two adjacent magnets a to expand the back cavity volume of the bass part.

[0084] It should be noted that the above-mentioned annular structure refers to a structure with a hollow center and has nothing to do with the shape of its outer circumference.

[0085] Embodiment 2

[0086] Please refer to 7. The only difference between the second embodiment and the first embodiment is that the third magnet 333 is radiantly magnetized, and the magnetization direction of the third magnet 333 is perpendicular to the vibration direction X, and the polarity of one end of the third magnet 333 close to the second magnet 332 is the same as the polarity of one end of the first magnet 331 close to the second magnet 332. Figure 7 A magnetic pole distribution mode of the first magnet 331 , the second magnet 332 and the third magnet 333 is shown.

[0087] Embodiment 3

[0088] Please refer to 8 , the only difference between the third embodiment and the first and second embodiments is that the third magnet 333 is composed of a plurality of magnets c arranged at intervals, and the plurality of magnets c are distributed in a ring shape.

[0089] It should be noted that, in other embodiments, the yoke can also be configured to be fixed on the side of the second magnet facing away from the first magnet, that is, the opening of the tweeter magnetic gap faces the yoke, and accordingly, the magnetic conductive plate is fixed on the side of the first magnet facing away from the second magnet, and the outer periphery of the tweeter diaphragm is fixed on the side of the yoke facing away from the main magnetic part.

[0090] The above is only an implementation method of the present invention. It should be pointed out that a person skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements are all within the protection scope of the present invention.

Claims

1. A coaxial loudspeaker, comprising a basin frame, a magnetic circuit system and a bass vibration system and a treble vibration system fixed to the basin frame, wherein the magnetic circuit system has a cavity, a treble magnetic gap and a bass magnetic gap, the bass vibration system comprises a bass diaphragm and a bass voice coil driving the bass diaphragm to vibrate, and the treble vibration system comprises a treble diaphragm and a treble voice coil inserted into the treble magnetic gap and driving the treble diaphragm to vibrate, characterized in that: The bass magnetic gap includes a first magnetic gap and a second magnetic gap, the bass voice coil includes a first voice coil and a second voice coil, the magnetic circuit system includes a yoke and a main magnetic part, a first secondary magnetic part and a second secondary magnetic part fixed to the yoke, the first secondary magnetic part is arranged around the main magnetic part and is spaced from the main magnetic part to form the first magnetic gap, the first voice coil is inserted into the first magnetic gap to surround the main magnetic part, the second secondary magnetic part is arranged around the first secondary magnetic part and is spaced from the first secondary magnetic part to form the second magnetic gap, the second voice coil is inserted into the second magnetic gap to surround the first secondary magnetic part and the first voice coil, the main magnetic part includes a first magnet, a first magnet along the vibration of the tweeter diaphragm, and a second secondary magnetic part is arranged around the first secondary magnetic part and is spaced from the first secondary magnetic part to form the second magnetic gap. A second magnet and a third magnet and a main pole core are arranged on the same side of the first magnet in the vibration direction, the second magnet is arranged around the third magnet, the main pole core includes a first plate portion and a second plate portion arranged at intervals along the vibration direction, and a wall portion connecting the first plate portion and the second plate portion, the wall portion is inserted between the second magnet and the third magnet and is spaced from the second magnet to form the treble magnetic gap, the first plate portion is clamped between the first magnet and the second magnet, the third magnet is clamped between the second plate portion and the first magnet, and the cavity passes through the yoke, the first magnet, the third magnet and the second plate portion along the vibration direction.

2. The coaxial loudspeaker according to claim 1, characterized in that: The bass diaphragm includes an annular first fold ring, a second fold ring arranged around the first fold ring, and a spherical top connecting the first fold ring and the second fold ring, the inner periphery of the first fold ring is fixed on the magnetic circuit system, and the outer periphery of the second fold ring is fixed on the basin frame, wherein the first voice coil and the second voice coil drive the bass diaphragm to vibrate via the spherical top.

3. The coaxial loudspeaker according to claim 2, characterized in that: The bass vibration system also includes a secondary flexible circuit board, which includes a first connecting part clamped between the outer periphery of the second folding ring and the basin frame, a second connecting part connected to the second voice coil, a plurality of elastic arms connecting the first connecting part and the second connecting part, a third connecting part connected to the first voice coil, and a plurality of connecting arms connecting the second connecting part and the third connecting part, wherein the second connecting part, the third connecting part and the connecting arms are all fixed to the dome.

4. The coaxial loudspeaker according to claim 1, characterized in that: The second secondary magnetic part is also fixed on the basin frame.

5. The coaxial loudspeaker according to claim 3, characterized in that: The first secondary magnetic part is provided with a plurality of avoidance parts for avoiding the plurality of connecting arms.

6. The coaxial loudspeaker according to claim 5, characterized in that: The plurality of escape portions divide the first auxiliary magnetic part into a plurality of magnetic units.

7. The coaxial loudspeaker according to claim 1, characterized in that: The first magnet and the second magnet are both magnetized along the vibration direction, and the first magnet and the second magnet have the same poles facing each other.

8. The coaxial loudspeaker according to claim 7, characterized in that: The first magnet and the third magnet have the same magnetization direction.

9. The coaxial loudspeaker according to claim 7, characterized in that: The third magnet is radiatively magnetized, and the magnetization direction of the third magnet is perpendicular to the vibration direction. The polarity of one end of the third magnet close to the second magnet is the same as the polarity of one end of the first magnet close to the second magnet.

10. The coaxial loudspeaker according to claim 1 or 7 or 8 or 9, characterized in that: The third magnet is a continuous annular magnet.

11. The coaxial loudspeaker according to claim 1 or 7 or 8 or 9, characterized in that: The third magnet is composed of a plurality of magnets arranged at intervals, and the plurality of magnets are distributed in a ring shape.

12. The coaxial loudspeaker according to claim 2, characterized in that: The yoke is fixed to the side of the first magnet facing away from the second magnet, the outer periphery of the tweeter diaphragm is fixed to the side of the second magnet facing away from the first magnet through a frame, and the inner periphery of the first fold ring is clamped between the frame and the second magnet.

13. The coaxial loudspeaker according to claim 12, characterized in that: The main magnetic part further includes a magnetic conductive plate fixed to a side of the second magnet facing away from the first magnet, and the orthographic projection of the magnetic conductive plate on the tweeter diaphragm is located within the range of the tweeter diaphragm.

14. The coaxial loudspeaker according to claim 1, characterized in that: An insert is provided in the cavity, and the tweeter voice coil is electrically connected to an external circuit via the insert.

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