CN217508995U

CN217508995U - Novel bone conduction bluetooth headset

Info

Publication number: CN217508995U
Application number: CN202221348934.0U
Authority: CN
Inventors: 宋忠明; 蔡炳华
Original assignee: Shenzhen Yiyin Technology Co ltd
Current assignee: Shenzhen Yiyin Technology Co ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-09-27
Anticipated expiration: 2032-05-30

Abstract

The utility model discloses a novel bone conduction bluetooth headset, including the loudspeaker shell that forms pronunciation cavity, still include the vibration transmission layer of vibration unit and even wall thickness, this loudspeaker shell fixes this vibration unit in this cavity, and the protruding stretching of this vibration transmission layer is outside this cavity, and the top of this vibration unit includes the flexible circuit apron, sets up soft extrusion piece on this flexible circuit apron, and this extrusion piece is fully close to this vibration transmission layer. The utility model discloses a novel bone conduction bluetooth headset increases the extrusion piece, raises vibration unit and human laminating part, extrudees the flexible circuit board lid that is equipped with the voice coil loudspeaker voice coil in the piece extrusion vibration unit when wearing pressure, makes its atress change pronunciation frequency and reduce the energy transfer decay of the positive and negative half week of sound wave, has greatly improved the well high audio volume.

Description

Novel bone conduction bluetooth headset

Technical Field

The utility model relates to an electroacoustic product technical field, concretely relates to novel bone conduction bluetooth headset.

Background

There are two ways of sound propagation: one is by air vibration propagation; one is by direct vibration propagation. Bone conduction speaker propagates sound through direct vibration people's skeleton or skin tissue, and its theory of operation is through converting the signal of telecommunication into mechanical vibration signal, and mechanical vibration passes through people's skeleton or skin tissue and propagates sound, can realize clear sound reduction in noisy environment, and consequently novel bone conduction bluetooth headset obtains user's favor.

The bone conduction earphone of the prior art, a bone conduction loudspeaker is arranged on a face cover protruding out of a loudspeaker shell through an integral body, the lower side of the face cover is connected to a vibrator through a connecting component in a rigid and direct mode, and then a soft silica gel layer is sleeved on the face cover. Taking the sinusoidal vibration wave signal of the music signal as an example, the resonant bone conduction speaker moves upward during the positive half wave, and moves downward during the negative half wave. The horn oscillator of the existing bone conduction earphone has the following defects: in the positive half cycle, the resonant horn moves upwards and can normally operate; when in the negative half cycle, the resonance horn can move downwards, but the rigid support of the connecting part keeps the motion of the negative half cycle of the bone conduction horn to be blocked and cannot be well attached to the human body, so that the vibration wave information of the negative half cycle cannot be completely transmitted to the human body, and the sound is not really restored.

Disclosure of Invention

Based on this, for foretell technical problem in solving the conventional art, the utility model provides a make the flexible atress of flexible circuit board lid that is equipped with the voice coil loudspeaker voice coil to change pronunciation frequency, reduce the energy transfer decay of the positive and negative half-cycle of sound wave, greatly improve the novel osteoacusis bluetooth headset of well high audio volume and true reduction sound.

The utility model relates to a novel bone conduction bluetooth headset, including the loudspeaker shell that forms pronunciation cavity, still include the vibration transmission layer of vibration unit and even wall thickness, this loudspeaker shell fixes this vibration unit in this cavity, and the protruding stretching of this vibration transmission layer is outside this cavity, and the top of this vibration unit includes the flexible circuit apron, sets up soft extrusion piece on this flexible circuit apron, and this extrusion piece is fully close to this vibration transmission layer.

The utility model discloses a novel osteoacusis bluetooth headset, through the flexible glue extrusion piece that increases certain thickness, for example, ABS such as engineering plastic, PC + ABS etc, perhaps silica gel, TPU, flexible glue such as TPE, raise vibration unit and human laminating part, the pressure of wearing promotes the extrusion piece and further extrudees the flexible circuit board lid that is equipped with the voice coil loudspeaker voice coil in the vibration unit, make flexible circuit apron atress change pronunciation frequency and reduce the positive and negative half week energy transfer decay of sound wave, greatly improve the well high audio volume. Taking a sinusoidal vibration wave signal of a music signal as an example, the vibration unit moves upwards to be close to the skin when the period is a positive half wave; when the cycle is negative half-wave, the vibration unit can still be well attached to the human body due to soft deformation without being blocked to move downwards, and the vibration wave information of the negative half-cycle can be completely transmitted to the human body so as to truly restore the sound.

The utility model discloses a novel bone conduction bluetooth headset, the vibration unit adopts novel slim suspension type vibration unit, and the flexible circuit apron is adopted at the top of this vibration unit, sets up the switching circuit in this flexible circuit apron, and the design of this flexible circuit apron not only saves apron mechanical structure to the structure of flexible circuit board can change the vibration frequency of vibration unit and further improve medium-high frequency volume.

Furthermore, the utility model discloses a novel bone conduction bluetooth headset's vibration unit sets up sectional shelf-unit, sets up shell fragment and support integrated into one piece among the sectional shelf-unit, and is connected with this magnetic circuit assembly through this shell fragment, can guarantee the uniformity of this trembler subassembly for this speaker design is thinner.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Wherein:

fig. 1 is a schematic perspective view of the bone conduction bluetooth headset of the present invention;

FIG. 2 is a schematic diagram of the explosion assembly of the right speaker;

FIG. 3 is a center sectional view of the right speaker;

FIG. 4 is a view of the internal structure of the main housing of the right speaker;

fig. 5 is a schematic perspective view of a fixing frame of the bone conduction speaker device according to the present invention;

fig. 6 is another perspective structure view of the fixing frame of the bone conduction bluetooth headset of the present invention;

fig. 7 is a three-dimensional structure diagram of the vibration unit of the bone conduction bluetooth headset of the present invention;

fig. 8 is a three-dimensional structure diagram of the reverse viewing angle of the combined bracket of the bone conduction bluetooth headset of the present invention;

fig. 9 is a schematic view of an exploded structure of a vibration unit of the bone conduction bluetooth headset of the present invention;

fig. 10 is a central sectional view of the vibration unit of the present invention;

fig. 11 is a cross-sectional view of a second embodiment of the vibration unit of the bone conduction bluetooth headset of the present invention;

fig. 12 is a cross-sectional view of a third embodiment of the vibration unit of the bone conduction bluetooth headset of the present invention;

fig. 13 is a cross-sectional view of the fourth embodiment of the vibration unit of the bone conduction bluetooth headset of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Please refer to fig. 1 to fig. 6 together, which show the structure diagram of the novel bone conduction bluetooth headset of the present invention; fig. 7 to 13 are structural diagrams of a specific structure of the vibration unit and different embodiments, the structure of the vibration unit being applied to the vibration unit of the left speaker and also to the vibration unit 85 of the right speaker.

The utility model discloses a novel bone conduction bluetooth headset raises vibration unit and human laminating part through the flexible glue extrusion piece that increases certain thickness, and the pressure of wearing promotes the flexible circuit board lid that is equipped with the voice coil loudspeaker voice coil in the extrusion vibration unit of extrusion piece, makes the flexible circuit apron atress change the pronunciation frequency and reduce the energy transfer decay of the positive and negative half week of sound wave, greatly improves the well audio volume. Taking a sinusoidal vibration wave signal of a music signal as an example, the vibration unit moves upwards to be close to the skin when the period is a positive half wave; when the cycle is negative half-wave, the vibration unit can still be well attached to the human body due to soft deformation without being blocked to move downwards, and the vibration wave information of the negative half-cycle can be completely transmitted to the human body so as to truly restore the sound.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Please refer to fig. 1 to fig. 6 together, which show the structure diagram of the novel bone conduction bluetooth headset of the present invention.

As shown in fig. 1, the novel bone conduction bluetooth headset of the present embodiment includes a left speaker 6, a right speaker 8 and a rear hanger 5. When the left loudspeaker 6 is hung on the left ear, the right loudspeaker 8 is hung on the right ear, and the rear hanger 5 is worn around the back brain.

The rear hanger 5 is provided with a conduit through which wires of the left speaker 6 and the right speaker 8 are routed and connected. The structure and internal configuration will be described below taking the right speaker 8 as an example.

Referring to fig. 2 and 4, the right speaker 8 includes a right main housing 81, a right body housing 811, and a right horn housing 812. The right body housing 811 encloses a control chamber and the right horn housing 812 encloses a horn sounding chamber.

The control cavity of the right loudspeaker 8 is internally provided with a main control circuit board, a memory card and a microphone. A right key module (not shown), a right vibration unit 85, a right squeeze sheet 86, and a right vibration transfer layer 87 of uniform wall thickness are provided in the horn chamber of the right speaker 8. The top of the right vibration unit 85 includes a right flexible circuit cover 30, and the memory card and the microphone are connected to the main control circuit board. In one embodiment, as shown in fig. 3, the right key module includes a right key 84 and a right key circuit board 841. The controller of the main control circuit board receives the touch signals of all the key modules so as to determine and start the corresponding earphone function.

The right vibration unit 85 is electrically connected with the main control circuit board through the wiring terminal of the right soft circuit cover plate 30, and the right key circuit board 841 is connected with the main control circuit board in the control cavity through the right soft circuit cover plate, so that the circuit layout in the loudspeaker is optimized. As shown in fig. 7, taking the right flexible circuit cover 30 as an example, a plurality of connection terminals 301 are disposed on the right flexible circuit cover 30, the right key module is connected to the right flexible circuit cover through the connection terminals 301, and the right flexible circuit cover is also connected to the main control circuit board through the connection terminals 301.

Referring to fig. 2, the right horn housing 812 includes a fixing frame 813. Referring to fig. 4, a plurality of first fasteners, such as the first fastener 8121, are disposed around the inner wall of the horn housing 812. Referring to fig. 6, a plurality of fastening tongues 8136 are disposed on one side of the fixing frame 813, each fastening tongue 8136 is provided with a first fixing groove 8137, and the fixing frame 813 is detachably mounted on the speaker housing 812 by the cooperation of the first fastening 8121 and the first fixing groove 8137.

As shown in fig. 3, the right horn housing 812 fixes the right vibration unit 85 in the horn cavity.

Referring to fig. 5, a mounting plane 8131 and a limiting boss 8133 are disposed at the top of the right fixing frame 813. The inner wall of the right fixing frame 813 is provided with a plurality of second fasteners, such as a second fastener 8132. The right vibration transfer layer 87 is attached to the mounting plane 8131 by adhesive under the constraint of the limit boss 8133, while the right vibration transfer layer 87 is higher than and protrudes from the limit boss 8133.

A plurality of second locking grooves, such as the second locking groove 113 shown in fig. 7, are formed in the outer peripheral wall of the right vibration unit 85, and the second locking groove 113 is matched with the second fastener 8132, so that the vibration unit 85 is detachably mounted on the fixing frame 813.

In this embodiment, the right vibration transmission layer 87 protrudes out of the speaker cavity, and the top of the right vibration unit 85 is provided with the right flexible circuit cover 30 in which the speaker circuit is disposed. The right flexible circuit cover 30 is provided with a right flexible pressing piece 86, and the right flexible pressing piece 86 is substantially close to the right vibration transmission layer 87.

The wall thickness between the contact surface and the back surface of the right vibration transmission layer 87 is uniform, and a set gap is maintained between the back surface of the right vibration transmission layer 87 and the right pressing piece 86.

As shown in fig. 3, the right extrusion sheet 86 made of soft rubber has uniform thickness, the vibration transmission layer 87 part of the vibration unit attached to the human body can be lifted, the pressure worn by the earphone enables the right vibration transmission layer 87 to eliminate the set gap and tightly press the right extrusion sheet 86, the right extrusion sheet 86 with soft deformation further extrudes the right flexible circuit board cover 30 provided with the voice coil, the right flexible circuit board cover 30 is stressed to change the sound frequency, meanwhile, the right vibration transmission layer 87 attached tightly and the right extrusion sheet 86 have no medium transmission energy, and compared with the structure such as a connecting fastener or an adhesive, the energy transmission attenuation of positive and negative half cycles of sound waves can be reduced, the medium and high audio volume is greatly improved, and meanwhile, the sound is more really restored.

Similarly, the left speaker 6 includes a left main housing, a left body housing, and a left horn housing. The left machine body shell encloses a battery cavity, and the left horn shell encloses a horn cavity. And a rechargeable battery is arranged in the left battery cavity. The left horn cavity is internally provided with a left key module, a left vibration unit, a left extrusion sheet and a left vibration transmission layer with uniform wall thickness. The rechargeable battery is connected with the main control circuit board. In one embodiment, the left button module includes a left button and a left button circuit board.

The left key module is connected to the main control circuit board 7 through the left soft circuit cover plate, and meanwhile, the left vibration unit is also electrically connected with the main control circuit board 7 through the wiring end of the left soft circuit cover plate, so that the circuit layout inside the loudspeaker is optimized.

The structures of the vibration unit, the squeeze sheet, and the vibration transmission layer of the left speaker 6 are the same as those of the right speaker 8, and are not described again.

The right vibration unit 85 is used as an example, and the left vibration unit has the same structure, so that the following description of the vibration unit is not left or right for the convenience of understanding.

Referring to fig. 9, in the embodiment, each vibration unit includes a vibration plate assembly and a magnetic circuit assembly 20 matched with the vibration plate assembly. The vibrating plate assembly comprises a combined support 10, wherein the combined support 10 comprises a support 11 with two ends penetrating in a cylindrical shape and an annular elastic sheet 12 arranged on the inner side of the support 11. The combined bracket 10 is sleeved on a portion of the periphery of the magnetic circuit assembly 20, and the spring plate 12 is connected with the magnetic circuit assembly 20. The flexible circuit cover 30 is disposed above the bracket 11, the pressing piece 86 is mounted on the top of the flexible circuit cover 30, and in one embodiment, the wiring groove 31 is disposed on the flexible circuit cover 30.

Fig. 10 to fig. 13 show a preferred embodiment of the vibration unit of the bone conduction bluetooth headset of the present invention. This vibration unit can assemble in this novel bone conduction bluetooth headset, has that spare part is few, the assembly is convenient, the sound leakage is little, vibration frequency is high, the power saving, the little advantage of distortion. The vibration unit has the advantages of simple process, few procedures, convenience for mass production of automatic production lines, high assembly efficiency and low reject ratio.

As shown in fig. 9 to 10, the vibration unit includes a diaphragm assembly, a magnetic circuit assembly 20, a flexible circuit cover 30, and a voice coil 40. The vibration plate member is fitted with the magnetic circuit member 20, and can generate sound by vibration.

In this embodiment, the membrane module may comprise a combi-supporter 10. The combi-bracket 10 may be assembled with the magnetic circuit assembly 20. The combination bracket 10 may include a bracket 11 and a resilient piece 12. The bracket 11 may have a cylindrical structure with two through ends, and may include a first opening 110 and a second opening 112. The first opening 110 and the second opening 112 may be disposed in communication. Specifically, the holder 11 may be substantially cylindrical. It will be appreciated that in other embodiments, the holder 11 may not be limited to being cylindrical. In an embodiment, a limiting groove 111 may be disposed at the first opening 110, and the limiting groove 111 may be used for limiting the position of the flexible circuit cover 30. In one embodiment, the bracket 11 may be an injection molded part. In particular, a plastic material may be used. It is understood that in other embodiments, the bracket 11 may not be limited to plastic. In some embodiments, the spring 12 may be annular. The elastic sheet 12 may be disposed on the sidewall of the bracket 11 and may protrude toward the inner side of the bracket 11. Specifically, the elastic sheet 12 may be annular, the elastic sheet 12 may be disposed near the second opening 112 of the bracket 11, and the annular surface of the elastic sheet 12 may be partially embedded in the bracket 11. The elastic sheet 12 may be disposed coaxially with the bracket 11, and specifically, a central through hole of the elastic sheet 12 may be disposed coaxially with a central hole of the bracket 11. In some embodiments, the spring 12 may be integrally formed with the bracket 11. In some embodiments, the elastic piece 12 and the bracket 11 can be integrally formed by injection molding.

In this embodiment, the vibration unit 85 further includes a voice coil 40, the voice coil 40 may be cylindrical, and a radial dimension of the voice coil 40 may be smaller than a radial dimension of the holder 11. The voice coil 40 may be partially inserted into the spring plate 12, and one end of the voice coil 40 may be connected to the flexible circuit cover 30, specifically, one end of the voice coil 40 may be bonded to the surface cover. In some embodiments, a lead 41 may be led out of the voice coil 40, and the lead 41 may be led out of the flexible circuit cover 30.

The magnetic circuit assembly 20 may include a support structure 21, and in this embodiment, the support structure 21 may be a U-shaped iron. It will be appreciated that the support structure 21 may not be limited to a U-shaped iron. In this embodiment, the supporting structure 21 may include a body 211 and a supporting arm 212. The body 211 may have a cylindrical structure with an opening at one end, and specifically, the body 211 may have a cylindrical structure, and a radial dimension of the body 211 may be smaller than a radial dimension of the elastic piece 12. The body 211 may have a receiving cavity 213 formed therein. In some embodiments, the assembly frame 10 may be disposed around the portion of the supporting structure 21. The supporting arm 212 may be disposed at an opening end of the body 211 and extend along a radial direction, and the supporting arm 212 may be disposed along a circumferential direction of the body 211 and may be suspended on the elastic sheet 12, so as to detachably assemble the vibrating reed assembly and the magnetic circuit assembly 20. When the speaker is installed, the body 211 can be passed through the central through hole of the elastic sheet 12, and the supporting arm 212 is suspended on the ring surface of the elastic sheet 12, so that the speaker can be designed to be thinner.

In this embodiment, the magnetic circuit assembly 20 may further include a first magnet 22, the first magnet 22 may be disposed in the receiving cavity 213 of the supporting structure 21, and in some embodiments, the first magnet 22 may have a cylindrical shape, and a radial dimension thereof may be smaller than a radial dimension of the receiving cavity 213. The voice coil 40 may be disposed around the portion of the first magnet 22 and is coaxial with the first magnet 22.

The flexible circuit cover 30 is disposed at the first opening 110 of the bracket 11, specifically, in the limiting groove of the bracket 11, the flexible circuit cover 30 is disc-shaped, and the radial dimension of the flexible circuit cover 30 is smaller than the radial dimension of the first opening 110. The flexible circuit cover 30 may be provided with a wire slot 31, and the wire slot 31 may be used for a wire connected to the voice coil 40 to pass through. The flexible circuit cover 30 is topped with a squeeze tab 86.

Fig. 11 shows a second embodiment of the vibration unit of the present invention, which is different from the first embodiment in that the magnetic circuit assembly 20 may further include a first magnetic conductive member 23, and the first magnetic conductive member 23 may be disposed on the first magnet 22. In some embodiments, the first magnetic conductive member 23 may be a washer, and the radial dimension of the first magnetic conductive member 23 may be adapted to the radial dimension of the first magnet 22.

Further, in the present embodiment, the magnetic circuit assembly 20 further includes a weight 24, the weight 24 may be cylindrical and may be disposed on the periphery of the supporting structure 21, and in some embodiments, the weight 24 may be disposed on the periphery of the U-shaped iron body 211. The weight 24 may be a metal or ceramic member, and in particular, may be an iron ring. It is understood that in other embodiments, the weight member 24 may not be limited to a metal or ceramic member.

Fig. 12 shows a third embodiment of the vibration unit of the present invention, which is different from the second embodiment in that the supporting structure 21 may be a T-iron, the magnetic circuit assembly 20 may further include a second magnet 25, the second magnet 25 may be disposed on the supporting structure 21, specifically, the second magnet 25 may be sleeved on the T-iron, and the second magnet 25 may be cylindrical. In this embodiment, the magnetic circuit assembly 20 may further include a second magnetic conductive member 27, and the second magnetic conductive member 27 may be disposed on the second magnet 25. The elastic sheet 12 may be partially inserted between the second magnetic conductive member 27 and the second magnet 25.

Fig. 13 shows a fourth embodiment of the vibration unit of the invention, which differs from the second embodiment in that the weight 24 can be omitted. The flexible circuit cover 30 may be annular, and the flexible circuit cover 30 may be disposed coaxially with the first magnet 22.

In this embodiment, the magnetic circuit assembly 20 may further include a third magnet 26, the third magnet 26 may be cylindrical, and may be disposed on the first magnetic conducting member 23, and a radial dimension of the third magnet 26 may be smaller than a radial dimension of the first magnet 22, and a height of the third magnet may be smaller than a height of the first magnet 22. In this embodiment, a pressing piece 86 is mounted on the top of the third magnet 26.

The utility model discloses a bone conduction speaker adopts novel ultra-thin bone conduction loudspeaker to make speaker's overall structure smaller and more exquisite. Furthermore, the utility model discloses a bone conduction speaker's bone conduction loudspeaker sets up shell fragment and support integrated into one piece in the sectional shelf through setting up the sectional shelf, and is connected with this magnetic circuit assembly through this shell fragment, can guarantee the uniformity of this trembler subassembly for this speaker design is thinner.

It is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, equivalent arrangements, and equivalents thereof.

Claims

1. The utility model provides a novel bone conduction bluetooth headset, is including the loudspeaker shell that forms pronunciation cavity, its characterized in that still includes the vibration transmission layer of vibration unit and even wall thickness, the loudspeaker shell is in fix in the cavity the vibration unit, the protruding stretch in of vibration transmission layer outside the cavity, the top of vibration unit includes the flexible circuit apron, set up soft extrusion piece on the flexible circuit apron, the extrusion piece is fully close to the vibration transmission layer.

2. The novel bone conduction bluetooth headset according to claim 1, wherein the wall thickness between the contact surface and the back surface of the vibration transmission layer is uniform, and a set gap is maintained between the back surface of the vibration transmission layer and the pressing sheet.

3. The novel bone conduction Bluetooth headset of claim 1, further comprising a fixing frame, wherein a plurality of first fasteners are disposed around the inner wall of the speaker housing, a plurality of first fixing grooves are disposed on one side of the fixing frame, and the fixing frame is detachably mounted on the speaker housing by the cooperation of the first fasteners and the first fixing grooves.

4. The novel bone conduction Bluetooth headset of claim 3, wherein a mounting plane and a limiting boss are disposed on the top of the fixing frame, a plurality of second fasteners are disposed on the inner wall of the fixing frame, and the vibration transmission layer is adhered to the mounting plane and protrudes above the limiting boss under the constraint of the limiting boss.

5. The novel bone conduction Bluetooth headset of claim 4, wherein a plurality of second locking grooves are formed in an outer peripheral wall of the vibration unit, and the second locking grooves and the second snap-fit are used for detachably mounting the vibration unit on the fixing frame.

6. The novel bone conduction Bluetooth headset of claim 1, wherein the vibration unit includes a vibration plate assembly and a magnetic circuit assembly engaged with the vibration plate assembly; the vibrating reed component comprises a combined support, and the combined support comprises a cylindrical support with two through ends and an annular elastic sheet arranged on the inner side of the support; the combined bracket is sleeved on the periphery of part of the magnetic circuit assembly, the elastic sheet is connected with the magnetic circuit assembly, and the soft circuit cover plate is arranged above the bracket.

7. The novel bone conduction Bluetooth headset of claim 6,

the magnetic circuit component comprises a supporting structure and a first magnet arranged in the supporting structure, the novel bone conduction Bluetooth headset further comprises a voice coil arranged on the periphery of the first magnet in a sleeved mode, and the supporting structure comprises a body and a supporting arm arranged at one end of the body and capable of being hung on the elastic piece.

8. The novel bone conduction bluetooth headset of claim 7, wherein the magnetic circuit assembly further comprises a second magnet disposed on the support structure;

and/or the magnetic circuit assembly further comprises a first magnetic conduction piece arranged on the first magnet.

9. The novel bone conduction bluetooth headset of claim 8, wherein the magnetic circuit assembly further includes a third magnet disposed on the first magnetically permeable member.

10. The novel bone conduction bluetooth headset of claim 7, wherein the support structure is a U-shaped iron or a T-shaped iron;

and/or the magnetic circuit component also comprises a counterweight part sleeved on the periphery of the supporting structure.