Coaxial loudspeaker

Abstract

A coaxial loudspeaker, comprising: a basket, a magnetic circuit system, a woofer vibration system and a tweeter vibration system, wherein the magnetic circuit system is provided with a cavity, a tweeter magnetic gap and woofer magnetic gaps, the woofer vibration system comprises a woofer diaphragm and woofer voice coils, and the tweeter vibration system comprises a tweeter diaphragm and a tweeter voice coil, the woofer magnetic gaps including a first magnetic gap and a second magnetic gap, and the woofer voice coils including a first voice coil and a second voice coil; and the magnetic circuit system comprises a magnetic yoke, a main magnetic portion, a first auxiliary magnetic portion and a second auxiliary magnetic portion, the first voice coil surrounding the main magnetic portion, the second voice coil surrounding the first auxiliary magnetic portion and the first voice coil, and the main magnetic portion comprising a first magnet, a second magnet, a third magnet held between a second plate portion and the first magnet, and a main pole core, the main pole core comprising a first plate portion held between the first magnet and the second magnet, a second plate portion, and a wall portion inserted between the second magnet and the third magnet and spaced apart from the second magnet to form the tweeter magnetic gap.

Description

coaxial speakers Technical Field

[0001] The present invention relates to the field of electroacoustics, and in particular to a coaxial loudspeaker. Background Art

[0002] A coaxial speaker is one that integrates a tweeter and a woofer, with the tweeter and woofer arranged coaxially. The sound sources of the tweeter and woofer can be located on the front of the coaxial speaker, meaning the two speaker units emit sound in the same direction, or on the front and back of the coaxial speaker, meaning the two speaker units emit sound in different directions.

[0003] A coaxial speaker in the related art includes a frame, a magnetic circuit system fixed to the frame, a woofer vibration system, and a tweeter vibration system. The magnetic circuit system has a cavity, a tweeter magnetic gap surrounding the cavity, and a woofer magnetic gap surrounding the tweeter magnetic gap. The magnetic circuit system includes a yoke and a main magnetic portion fixed to the yoke and surrounded by the woofer magnetic gap. The cavity extends through the yoke and the main magnetic portion along the vibration direction, and the main magnetic portion forms the tweeter magnetic gap. The tweeter vibration system includes a tweeter diaphragm and a tweeter voice coil. The tweeter voice coil is inserted into the tweeter magnetic gap and drives the tweeter diaphragm to vibrate. The woofer vibration system includes a woofer diaphragm and a woofer voice coil that drives the woofer diaphragm to vibrate. The woofer voice coil includes three voice coils spaced apart along the length of the coaxial speaker. The cavity can be provided with an insert that electrically connects the tweeter voice coil to an external circuit. Alternatively, when the tweeter diaphragm and the woofer diaphragm are located on different sides of the magnetic circuit system, the cavity can also serve as a sound conduction cavity to transmit sound emitted by the tweeter diaphragm to the other diaphragm located on the same side as the woofer diaphragm, thereby achieving same-side sound generation in the coaxial speaker. 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 usually 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 the length direction, which is not conducive to the miniaturization of the speaker, but also the bass voice coil will cause the bass diaphragm to be driven unbalanced in the length and width directions of the coaxial speaker, thereby affecting the sound performance.

[0006] Therefore, it is necessary to study a coaxial loudspeaker with a new structure. Summary of the Invention

[0007] The present invention aims to solve the problems of insufficient space utilization inside the tweeter voice coil, excessive length dimension and unbalanced driving of the bass diaphragm in the coaxial loudspeaker, and provides a coaxial loudspeaker with a novel magnetic circuit structure.

[0008] To achieve the above-mentioned objectives, the present invention provides a coaxial loudspeaker, comprising a basin, a magnetic circuit system fixed to the basin, a bass vibration system, and a treble vibration system, 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 for driving the bass diaphragm to vibrate, the treble vibration system comprising a tweeter diaphragm and a tweeter voice coil inserted into the tweeter magnetic gap and driving the tweeter 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 to the yoke, the first secondary magnetic portion being arranged around the main magnetic portion and spaced apart 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 configured to have a first end in contact with the first and second magnets and a second end in contact with the first magnet, the second end in contact with the first magnet and the second magnet being coupled to the yoke.

[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 dome 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 through the dome.

[0010] As an improvement, 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.

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

[0012] As an improvement, the first secondary magnetic portion is provided with a plurality of avoidance portions 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, 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.

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

[0016] As an improvement, the third magnet is radiatively 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 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.

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

[0022] The beneficial effects of the present invention 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 spaced apart 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 set 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 set around the main magnetic part and a second magnetic gap set 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 secondary magnetic part. The magnetic part system and bass vibration system set 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 to make the bass diaphragm drive balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic exploded perspective view of a coaxial loudspeaker according to an embodiment of the present invention.

[0024] FIG2 is a schematic structural diagram of the main pole core in the coaxial loudspeaker shown in FIG1 .

[0025] FIG3 is a schematic structural diagram of the auxiliary flexible circuit board in the coaxial speaker shown in FIG1 .

[0026] FIG4 is a schematic structural diagram of the coaxial loudspeaker shown in FIG1 after assembly.

[0027] FIG5 is a cross-sectional view of the coaxial loudspeaker shown in FIG4 along line AA, wherein the cross-sectional view only retains a portion of the two portions symmetrical about the dotted line d.

[0028] FIG6 is a cross-sectional view of the coaxial loudspeaker shown in FIG4 along line BB, wherein the cross-sectional view only retains a portion of the two portions symmetrical about the dotted line d.

[0029] FIG7 is a cross-sectional view of the coaxial loudspeaker according to the second embodiment of the present invention. The cross-sectional view only retains a portion of the two portions symmetrical about the dotted line d.

[0030] FIG8 is a top view of the tri-coaxial loudspeaker without the tweeter vibration system and the main pole core according to the embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to FIG. 1 to FIG. 8 .

[0032] As shown in Figures 5 to 7, the thickness direction of the coaxial speaker of the present invention is defined as the vibration direction X, and 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. Example 1

[0033] As shown in Figures 1 to 7, the coaxial speaker of the present invention includes a frame 1, a magnetic circuit system 3, a bass vibration system 5, and a treble vibration system 7 secured to the frame 1. The bass vibration system 5 surrounds 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, producing low-frequency sounds, while the magnetic circuit system 3 drives the treble vibration system 7 to vibrate, producing high-frequency sounds. This combined sound generation of the bass vibration system 5 and the treble vibration system 7 increases the frequency band of the coaxial speaker's sound.

[0034] 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.

[0035] The magnetic circuit system 3 has a cavity 3A, a high-frequency magnetic gap 3B and a low-frequency magnetic gap 3C.

[0036] The tweeter magnetic gap 3B surrounds the cavity 3A;

[0037] The bass magnetic gap 3C includes a first magnetic gap 3D and a second magnetic gap 3E; wherein,

[0038] The first magnetic gap 3D is arranged around the tweeter magnetic gap 3B;

[0039] The second magnetic gap 3E is disposed around the first magnetic gap 3D.

[0040] 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.

[0041] 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 .

[0042] The tweeter magnetic gap 3B is formed on the main magnetic portion 33 .

[0043] The first auxiliary magnetic portion 35 surrounds the main magnetic portion 33 and is spaced apart from the main magnetic portion 33 to form a first magnetic gap 3D. In other words, the tweeter magnetic gap 3B and the main magnetic portion 33 are both surrounded by the first magnetic gap 3D.

[0044] The second secondary magnetic portion 37 surrounds 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.

[0045] The second auxiliary magnetic portion 37 is further fixed to the frame 1 so that the magnetic circuit system 3 is fixed to the frame 1 .

[0046] 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 .

[0047] The second magnet 332 is disposed around the third magnet 333 .

[0048] The main pole core 334 includes a first plate portion 336 and a second plate portion 337 spaced apart from each other along the vibration direction X, and a wall portion 338 connecting the first plate portion 336 and the second plate portion 337 .

[0049] The first plate portion 336 is sandwiched between the first magnet 331 and the second magnet 332 .

[0050] 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.

[0051] The third magnet 333 is sandwiched between the second plate portion 337 and the first magnet 331 .

[0052] 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.

[0053] As shown in FIG. 1 , FIG. 5 and FIG. 6 , the yoke 31 , the first magnet 331 , the third magnet 333 and the second plate portion 337 are all continuous annular structures.

[0054] 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.

[0055] 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 have the same poles facing each other. The first magnet 331 and the third magnet 333 have the same magnetization direction.

[0056] 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. FIG5 and FIG6 show a magnetic pole distribution of the first magnet 331 , the second magnet 332 and the third magnet 333 .

[0057] 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.

[0058] In this embodiment, as shown in Figures 5 and 6, the yoke 31 is fixed to the side of the first magnet 331 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 away from the first magnet 331 through the frame 8.

[0059] 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 .

[0060] The magnetic conductive plate 335 is annular in shape, and its projection on the tweeter diaphragm 71 is within the tweeter diaphragm 71 .

[0061] The tweeter diaphragm 71 includes a diaphragm body 711 and a reinforcing plate 713 fixed to a side of the diaphragm body 711 facing away from the magnetic circuit system 3 .

[0062] As shown in FIG. 5 and FIG. 6 , the outer periphery of the film 711 is fixed to the side of the second magnet 332 facing away from the first magnet 331 through the frame 8 .

[0063] 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 .

[0064] The insert 9 is embedded with a conductive terminal (not shown) for electrically connecting the tweeter voice coil 73 with an external circuit.

[0065] In this embodiment, the tweeter vibration system 7 also includes a main flexible circuit board 75 fixed 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. 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 in the figure).

[0066] The bass vibration system 5 includes a bass diaphragm 51 and a bass voice coil 53 for driving the bass diaphragm 51 to vibrate.

[0067] 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 .

[0068] As shown in Figures 5 and 6, 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.

[0069] It should be noted that the first fold ring 511 , the second fold ring 513 and the tweeter diaphragm 71 are coaxially arranged.

[0070] In this embodiment, the bass diaphragm 51 further includes a counterweight 517 fixed to the side of the dome 515 facing away from the bass voice coil 53. The counterweight 517 is an annular structure.

[0071] 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 portion 33, and the second voice coil 533 is inserted into the second magnetic gap 3E to surround the first secondary magnetic portion 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. In other words, the first voice coil 531 and the second voice coil 533 must 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.

[0072] It should be noted that the first voice coil 531 and the second voice coil 533 are coaxially arranged.

[0073] In this embodiment, the bass vibration system 5 further includes a secondary flexible circuit board 55. The secondary flexible circuit board 55 includes a first connecting portion 551 clamped between the outer periphery of the second surround 513 and the basket frame 1; a second connecting portion 553 connected to the second voice coil 533; a plurality of elastic arms 555 connecting the first connecting portion 551 and the second connecting portion 553; a third connecting portion 557 connected to the first voice coil 531; and a plurality of connecting arms 559 connecting the second connecting portion 553 and the third connecting portion 557. The second connecting portion 553, the third connecting portion 557, and the connecting arms 559 are all fixed to the dome 515, so that the first and second voice coils 531, 533 are connected to the dome 515 via the secondary flexible circuit board 55. Compared to a bass vibration system with a single voice coil, the bass vibration system 5 using dual voice coils not only increases electromagnetic force, but also the coaxial series design of the dual voice coils in the bass section provides more balanced support for the bass diaphragm 51.

[0074] 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 .

[0075] It should be noted that the connection between the second connecting portion 553 and the second voice coil 533, and the connection between the third connecting portion 557 and the first voice coil 531, both include fixed connections and electrical connections. The first connecting portion 551 is also electrically connected to the conductive terminals molded on the frame 1, so that the first and second voice coils 531, 533 are electrically connected to the external circuit via the conductive terminals molded on the secondary flexible circuit board 55 and the frame 1.

[0076] The first auxiliary magnetic portion 35 is provided with a plurality of escape portions 35A for escaping the plurality of connection arms 559 .

[0077] The plurality of escape portions 35A divide the first auxiliary magnetic portion 35 into a plurality of magnetic units.

[0078] As shown in FIG. 1 , four escape portions 35A are provided, and accordingly, the first auxiliary magnetic portion 35 is divided into four magnetic units.

[0079] Each magnetic unit includes a fourth magnet 351 fixed to the yoke 31 and a first pole core 353 stacked on the fourth magnet 351 .

[0080] The second auxiliary magnetic portion 37 includes a fifth magnet 371 fixed to the yoke 31 and a second pole core 373 fixed to the side of the fifth magnet 371 away from the yoke 31 . The second pole core 373 is also fixed to the frame 1 so that the magnetic circuit system 3 is fixed to the frame 1 .

[0081] The second pole core 373 is a continuous ring structure.

[0082] 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.

[0083] It should be noted that the aforementioned ring-shaped structure refers to a structure with a hollow center and has nothing to do with the shape of its outer periphery. Example 2

[0084] Referring to Figure 7 , the only difference between Example 2 and Example 1 is that the third magnet 333 is radially magnetized, and the magnetization direction of the third magnet 333 is perpendicular to the vibration direction X. The polarity of the end of the third magnet 333 closest to the second magnet 332 is the same as the polarity of the end of the first magnet 331 closest to the second magnet 332. Figure 7 shows a magnetic pole distribution of the first magnet 331, the second magnet 332, and the third magnet 333. Example 3

[0085] 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.

[0086] It should be noted that, in other embodiments, the yoke can also be arranged 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. 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.

[0087] The above description is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the creative concept of the present invention, but these improvements all fall within the scope of protection of the present invention.

Claims

1. A coaxial loudspeaker, comprising a chassis, a magnetic circuit system fixed to the chassis, a bass vibration system and a treble vibration system, the magnetic circuit system having a cavity, a treble magnetic gap and a bass magnetic gap, the bass vibration system including a bass diaphragm and a bass voice coil for driving the bass diaphragm to vibrate, the treble vibration system including 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 sub-magnetic part, and a second sub-magnetic part fixed to the yoke. The first sub-magnetic part surrounds 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 sub-magnetic part surrounds the first sub-magnetic part and is spaced from the first sub-magnetic part to form the second magnetic gap. The second voice coil is inserted into the second magnetic gap to surround the first sub-magnetic part and the first voice coil. The main magnetic part includes a first magnet, a second magnet and a third magnet disposed on the same side of the first magnet along the vibration direction of the high-frequency diaphragm, and a main pole core. The second magnet surrounds the third magnet. The main pole core includes a first plate portion and a second plate portion spaced 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 high-frequency 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. The cavity penetrates 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 surround, a second surround surrounding the first surround, and a dome connecting the first surround and the second surround. The inner peripheral edge of the first surround is fixed to the magnetic circuit system. The outer peripheral edge of the second surround is fixed to the chassis. Wherein, the first voice coil and the second voice coil drive the bass diaphragm to vibrate through the dome.

3. The coaxial speaker according to claim 2, wherein: The bass vibration system further includes a sub-flexible circuit board. The sub-flexible circuit board includes a first connecting portion clamped between the outer peripheral edge of the second surround and the chassis, a second connecting portion connected to the second voice coil, a plurality of elastic arms connecting the first connecting portion and the second connecting portion, a third connecting portion connected to the first voice coil, and a plurality of connecting arms connecting the second connecting portion and the third connecting portion. Wherein, the second connecting portion, the third connecting portion and the connecting arms are all fixed to the dome.

4. The coaxial speaker according to claim 1, wherein: The second sub-magnetic part is also held by the chassis.

5. The coaxial speaker according to claim 1, characterized in that: The first sub-magnetic part is provided with a plurality of avoidance portions for avoiding a plurality of the connecting arms.

6. The coaxial speaker according to claim 5, wherein: The plurality of avoidance portions divide the first sub-magnetic part into a plurality of magnetic units.

7. The coaxial speaker according to claim 1, wherein: Both the first magnet and the second magnet are magnetized along the vibration direction, and the first magnet and the second magnet are opposite in the same pole.

8. The coaxial speaker according to claim 7, characterized in that: The magnetization directions of the first magnet and the third magnet are the same.

9. The coaxial speaker according to claim 7, wherein: The third magnet is radially magnetized, and the magnetization direction of the third magnet is perpendicular to the vibration direction. The polarity of the end of the third magnet close to the second magnet is the same as the polarity of the 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 annularly distributed.

12. The coaxial speaker according to claim 2, wherein: The yoke is fixed to the side of the first magnet facing away from the second magnet, the outer peripheral edge 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 peripheral edge of the first surround 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 conduction plate fixed to the side of the second magnet facing away from the first magnet, and the orthographic projection of the magnetic conduction plate on the tweeter diaphragm is within the range of the tweeter diaphragm.

14. The coaxial speaker 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 through the insert.

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