Exciter and vehicle audio system

Abstract

An exciter and a vehicle audio system. The exciter comprises a frame, a diaphragm, a voice coil and a magnetic circuit assembly for driving the voice coil. The diaphragm and the magnetic circuit assembly are arranged on the frame. The exciter further comprises a positioning piece and a connecting member. The positioning piece is connected to the diaphragm. The upper end portion of the connecting member is connected to the positioning piece, and the lower end portion of the connecting member is connected to the magnetic circuit assembly. The present disclosure reduces the axial offset of the exciter during vibration. The exciter can output stable sound and has improved power.

Description

Exciter and car audio system Related applications

[0001] This application claims priority to Chinese patent application No. CN 2023117763023, filed on December 22, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure belongs to the field of vehicle-mounted audio, and relates to an exciter and a vehicle-mounted audio system having the exciter. Background Art

[0003] An actuator is a harmonic generator. It increases sound loudness, penetration, reduces auditory fatigue, and enhances the spatial and three-dimensional perception of sound. Based on a specific frequency band within a selected audio signal, the actuator generates high-frequency harmonics within that band and adds them to the original audio signal, enhancing the harmonic components in the FM region and improving overtones. An actuator can be installed in a vehicle as part of an in-vehicle audio system to improve the in-vehicle sound field or create specific effects. For in-vehicle actuators, their size should be as compact as possible to minimize interior space and allow for flexible installation on vehicle components, minimizing assembly constraints. However, existing miniaturized actuators suffer from the following issues: axial misalignment during vibration, negatively impacting sound output, particularly large fluctuations in sound pressure levels within a specific frequency band, and limited permissible operating power.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0005] The present disclosure provides an exciter and a vehicle-mounted audio system having the exciter, which can reduce axial displacement of the exciter during vibration, output a more stable sound, and improve power.

[0006] One aspect of the present disclosure provides an actuator comprising:

[0007] Bracket;

[0008] a diaphragm, which is arranged on the bracket;

[0009] Voice coil;

[0010] a magnetic circuit assembly for driving the voice coil, wherein the magnetic circuit assembly is disposed on the bracket;

[0011] a positioning piece connected to the diaphragm; and

[0012] A connecting piece, wherein the upper end of the connecting piece is connected to the positioning piece, and the lower end of the connecting piece is connected to the magnetic circuit component.

[0013] In one embodiment, the positioning piece is connected to the upper surface of the diaphragm, a mounting hole is provided on the diaphragm, the positioning piece covers the mounting hole, and the connecting member is connected to the positioning piece through the mounting hole.

[0014] In one embodiment, the diaphragm includes a cone having an open upper end and a lower end, the upper end being connected to the bracket via a folding ring, and the lower end being enclosed to form the mounting hole that cooperates with the positioning plate; the positioning plate is connected to the lower end of the cone and covers the mounting hole.

[0015] In one embodiment, the positioning piece has a flat fixing portion and a corrugated portion surrounding the fixing portion, the corrugated portion protrudes upward or downward relative to the fixing portion, and the upper end portion of the connecting member is connected to the fixing portion.

[0016] In one embodiment, the corrugated portion has a valley formed by being concave downwards, and the corrugated portion surrounds the fixing portion.

[0017] In one embodiment, the corrugated portion has a wave crest that is arched upward, and the corrugated portion surrounds the fixing portion.

[0018] In one embodiment, the positioning piece is made of elastic material.

[0019] In one embodiment, the material of the positioning piece is rubber. The material of the positioning piece is the same as the material of the diaphragm surround, which is made of rubber and can be elastically deformed.

[0020] In an embodiment, an inner sound cavity is provided between the diaphragm and the magnetic circuit assembly, a through hole extending vertically therethrough is provided on the magnetic circuit assembly, and an air vent is provided on the connecting member to connect the through hole and the inner sound cavity.

[0021] In one embodiment, the connecting member includes a base plate and a connecting column extending upward from the middle of the base plate, the connecting column is connected to the positioning plate, the air vent is provided on the base plate and the outer edge of the base plate is connected to the magnetic circuit component.

[0022] In one embodiment, the ventilation hole is located between the connecting column and the outer edge of the bottom plate.

[0023] In one embodiment, the outer edge of the bottom plate is a connecting ring, and the connecting ring is connected to the middle part of the bottom plate through a plurality of connecting ribs, and the adjacent connecting ribs form the air holes.

[0024] In one embodiment, the actuator further includes a dustproof net covering the through hole. The dustproof net includes a mesh base formed by a plurality of mesh lines intersecting each other, with mesh holes formed between the mesh lines to provide air flow holes and block dust and foreign matter.

[0025] In one embodiment, the dustproof net is disposed between the connecting member and the magnetic circuit assembly.

[0026] In one embodiment, the positioning piece and the connecting member are located inside the voice coil, and the voice coil is connected to the diaphragm. Specifically, the upper end of the voice coil is connected to the upper end of the cone.

[0027] In one embodiment, the upper end of the cone is further connected to a circle of flange extending outward and downward.

[0028] In one embodiment, the diaphragm further comprises a folding ring fixed on the bracket, the folding ring is arranged around the cone, and the flange is fixedly connected to the folding ring.

[0029] In one embodiment, a connection between the voice coil and the diaphragm is close to an outer edge of the diaphragm, and a distance between the connection and the outer edge of the diaphragm is less than half a radius of the diaphragm.

[0030] A second aspect of the present disclosure provides a vehicle-mounted audio system, which includes a tweeter and / or a woofer, and the vehicle-mounted audio system further includes the exciter.

[0031] The exciter disclosed herein has a positioning plate fixed at the middle mounting hole of the diaphragm cone. The positioning plate is directly or indirectly fixed by a connector and a magnetic circuit assembly, and can play a good positioning role, ensuring that the diaphragm of the exciter will not shift during the vibration process, and positioning the diaphragm so that it keeps moving along the axis. The mechanical properties of the exciter are smoothed, and the power is higher while maintaining miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] FIG1 is a top view of an actuator according to an embodiment of the present disclosure.

[0034] FIG2 is a cross-sectional view taken along line AA in FIG1 .

[0035] FIG3 is an exploded view of an actuator according to an embodiment of the present disclosure.

[0036] FIG4 is a perspective view of a connector according to an embodiment of the present disclosure.

[0037] FIG5 is a cross-sectional view of a diaphragm and a positioning piece according to an embodiment of the present disclosure.

[0038] FIG6 is a cross-sectional view of another diaphragm and a positioning piece according to an embodiment of the present disclosure.

[0039] FIG7 is a cross-sectional view of an exciter of a comparative example.

[0040] FIG8 is a frequency response graph of the embodiment and the comparative example.

[0041] in,

[0042] 1 - Bracket; 10 - Inner sound cavity; 12 - Soldering piece; 2 - Diaphragm; 21 - Cone; 210 - Mounting hole; 211 - Upper end; 212 - Lower end; 213 - Flanged edge; 22 - Folding ring; 3 - Voice coil; 4 - Magnetic circuit; 40 - Magnetic gap; 41 - T-iron; 410 - Through hole; 42 - Magnet; 43 - Front piece; 5 - Positioning piece; 51 - Fixed part; 52 - Corrugated part; 521 - Wave trough; 522 - Wave crest; 6 - Connecting piece; 61 - Bottom plate; 610 - Vent hole; 611 - Connecting ring; 612 - Connecting rib; 62 - Connecting column; 7 - Dust screen. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present disclosure are described in detail below with reference to the accompanying drawings to make the advantages and features of the present disclosure more easily understood by those skilled in the art. It should be noted that the descriptions of these embodiments are intended to facilitate understanding of the present disclosure and do not constitute a limitation of the present disclosure. In addition, the technical features involved in the various embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.

[0044] In this document, the terms "inside" and "outside" are defined relative to the centerline of the voice coil, with the direction closer to the voice coil centerline considered inside and the direction farther away from it considered outside. The directional terms "upper," "lower," and "horizontal" are intended to facilitate understanding of the actuator's structure and are not intended to define the actuator's position after installation. For example, the actuator can be mounted on a horizontal, inclined, or vertical surface within a vehicle.

[0045] 1 to 8 are drawn in true proportion. To maintain the brevity of the specification, the proportions of each component are not listed one by one. However, the proportions and positions of each component should be considered as part of the content of this specification.

[0046] Herein, “axial direction” specifically refers to a direction extending along the center line of the voice coil. Vibration of the diaphragm along the center line of the voice coil is desirable. Example

[0047] This embodiment provides an exciter that is used as part of an in-vehicle audio system in conjunction with other speakers. In one embodiment, the in-vehicle audio system includes a woofer and an exciter. The exciter and woofer work together to improve the sound field in the bass frequency range. In another embodiment, the in-vehicle audio system includes a tweeter and an exciter. The exciter and tweeter work together to improve the sound field in the treble frequency range. In yet another embodiment, the in-vehicle audio system includes a woofer, a tweeter, and an exciter. The exciter, woofer, and tweeter work together to create a sound field with a specific effect.

[0048] 1 to 6 , the exciter includes a bracket 1, a diaphragm 2, a voice coil 3 and a magnetic circuit assembly 4. The bracket 1 is used to support and protect other components of the exciter, especially flexible or relatively fragile internal components such as the diaphragm 2 and the voice coil 3. The entire exciter is mounted on the vehicle through the bracket 1; for example, it is fixed to the dashboard of the vehicle through the bracket 11. The diaphragm 2 and the magnetic circuit assembly 4 are both fixed in the bracket 1, and one end of the voice coil 3 is connected to the diaphragm 2, and the other end can be inserted into the magnetic gap 40 of the magnetic circuit assembly 4 so as to move up and down. After the voice coil 3 is connected to the electrical signal, the magnetic field of the magnetic circuit assembly 4 can drive the voice coil 3 to vibrate up and down, thereby driving the diaphragm 2 to vibrate up and down to produce sound.

[0049] The diaphragm 2 includes a cone 21 and a folding ring 22. The cone 21 is generally in the shape of a truncated cone or a truncated pyramid that is larger at the top and smaller at the bottom. The cone 21 is cut from a sheet of paper, fabric, or other material and punched out in one piece, or is formed in one piece from plastic (such as PP (polypropylene)). The cone 21 has an open upper end 211 and a lower end 212. The upper end 211 of the cone 21 is fixed to the bracket 1 through the folding ring 22, specifically by gluing. The lower end 212 of the cone 21 encloses a mounting hole 210. The material of the folding ring 22 is rubber, which is flexible and can be elastically deformed. Furthermore, the upper end of the cone 21 is also connected to a circle of flange 213 extending outward and downward. The folding ring 22 is arranged around the cone 21, and the flange 213 is fixedly connected to the folding ring 22, specifically by gluing.

[0050] The voice coil 3 is generally cylindrical and extends vertically. It comprises a frame and a coil wound around the frame. The upper end of the frame is fixed to the diaphragm 2, and the portion of the voice coil 3 where the coil is wound extends into the magnetic gap 40 of the magnetic circuit assembly 4. In this embodiment, the connection between the voice coil 3 and the diaphragm 2 is close to the outer edge of the diaphragm 2. Specifically, the upper end of the voice coil 3 is connected to the cone 21 and is close to the surround 22. The distance between the connection between the voice coil 3 and the diaphragm 2 and the outer edge of the diaphragm 2 is less than half the radius of the diaphragm 2 (the outer radius of the surround 22), leaving a relatively large space within the voice coil 3.

[0051] Magnetic circuit assembly 4 includes a T-shaped iron 41, a magnetic steel 42, and a front plate 43. The magnetic steel 42 is stacked on the bottom of the T-shaped iron 41, and the front plate 43 is stacked on top of the magnetic steel 42. Both the magnetic steel 42 and the front plate 43 are annular and fit over the core of the T-shaped iron 41. The core extends upward from the middle of the bottom of the T-shaped iron 41. There is a gap between the magnetic steel 42 and the core of the T-shaped iron 41, and there is also a gap between the front plate 43 and the core of the T-shaped iron 41. These gaps are connected to form the magnetic gap 40 mentioned above.

[0052] The upper portion of the bracket 1 forms an inner acoustic cavity 10 between the diaphragm 2 and the magnetic circuit assembly 4. A through hole 410 is provided in the magnetic circuit assembly 4, connecting the inner acoustic cavity 10 to the outside world or another cavity. This allows internal airflow to escape, thereby lowering the natural frequency of the exciter and achieving superior performance. Specifically, through hole 410 extends vertically through the core of the T-iron 41.

[0053] As shown in Figures 2 and 3, the exciter also includes a positioning piece 5. The positioning piece 5 cooperates with the above-mentioned mounting hole 210. The positioning piece 5 is connected to the lower end of the cone 21 and covers the mounting hole 210. It should also be noted that the material of the positioning piece 5 is consistent with the material of the folding ring 22. It is fixed on the cone 21 and participates in vibration and sound generation together with the cone 21. If the positioning piece 5 is cancelled, the sound performance of the exciter will be reduced. The material of the positioning piece 5 is rubber, and its thickness is greater than the thickness of the cone 21. The positioning piece 5 is specifically connected to the upper surface of the diaphragm 2 and is connected to the connecting piece 6 below through the mounting hole 210. Specifically, the upper end of the connecting piece 6 passes through the mounting hole 210 or is inserted into the mounting hole 210, thereby reaching the positioning piece 6 to achieve connection.

[0054] As shown in conjunction with Figures 1 and 5 to 6 , the positioning piece 5 has a flat fixed portion 51 and a corrugated portion 52 surrounding the fixed portion 51, with the corrugated portion 52 protruding upward or downward relative to the fixed portion 51. The fixed portion 51 is arranged horizontally. The corrugated portion 52 surrounds the fixed portion 51 and is generally annular in shape, with the center of the annular ring located on the centerline of the voice coil 3. In one specific example, as shown in Figure 5 , the corrugated portion 52 extends downward relative to the fixed portion 51, thereby having a trough 521. In another specific example, as shown in Figure 6 , the corrugated portion 52 extends upward relative to the fixed portion 51, thereby having a peak 522. In comparison, the performance of the exciter using the positioning piece 5 shown in Figure 5 is superior to that of the exciter using the positioning piece 5 shown in Figure 6 . The outer edge of the positioning piece 5 is fixed to the lower end of the cone 21, for example, by gluing.

[0055] As shown in Figures 2 and 3, the exciter also includes a connector 6, which is a plastic part that is integrally injection-molded from plastic. The upper end of the connector 6 is connected to the positioning piece 5, and the lower end of the connector 6 is connected to the magnetic circuit assembly 4. Specifically, the upper end of the connector 6 is connected to the fixing portion 51 of the positioning piece 5, and the lower end of the connector 6 is directly or indirectly fixed to the T-iron 41. The connector 6 is also provided with an air vent 610 that connects the through hole 410 and the inner sound cavity 10.

[0056] As shown in Figure 4, the connector 6 includes a base plate 61 and a connecting post 62 extending upward from the middle of the base plate 61. The connecting post 62 is connected to the positioning plate 5. A vent 610 is provided on the base plate 61, and the outer edge of the base plate 61 is connected to the magnetic circuit assembly 4. The vent 610 is located between the connecting post 62 and the outer edge of the base plate 61. Specifically, in this embodiment, the outer edge of the base plate 61 is a connecting ring 611, which is connected to the middle of the base plate 61 via a plurality of connecting ribs 612. The vents 610 are formed between adjacent connecting ribs 612.

[0057] The exciter also includes a dustproof net 7, which covers the through hole 410 to prevent dust and other foreign matter from entering the inner sound cavity 10. Specifically in this embodiment, the dustproof net 7 is arranged between the connector 6 and the magnetic circuit assembly 4. The connector 6 is fixed to the magnetic circuit assembly 4 through the dustproof net 7, for example, by bonding them in sequence with glue. In other examples, the connector 6 can be directly fixed to the magnetic circuit assembly 4, for example, by bonding them with glue. The material of the dustproof net 7 can be: cotton cloth, plastic or metal; it itself has a plurality of mesh holes that allow air to pass through.

[0058] The exciter in this embodiment is a small exciter. The positioning piece 5 and connector 6 are located within the voice coil 3, which is connected to the upper end of the cone 21, fully utilizing the space within the voice coil 3. Furthermore, the connection between the voice coil 3 and the upper end of the cone 21, i.e., the connection between the voice coil 3 and the cone 21 is close to the outer edge of the diaphragm 2, not only improving the fit between the components but also enhancing the compliance of the vibration system, thereby achieving superior performance.

[0059] Comparative Example

[0060] 7 , the exciter of the comparative example differs from the exciter of the embodiment only in that no mounting hole 210 is provided in the middle of the cone 21 of the diaphragm 2 , and the exciter does not include a positioning piece and a connecting member.

[0061] Performance evaluation:

[0062] The acoustic performance of the exciter shown in Figure 3 and the comparative example exciter were evaluated, and their frequency response curves are shown in Figure 8. As shown in Figure 8, the addition of the positioning plate 5 and connector 6 to the exciter structure of the embodiment results in smoother measured mechanical properties. The comparative example, which lacks a positioning support structure, exhibits significant fluctuations between 1.5 kHz and 2 kHz, with peaks and valleys, resulting in a 17 dB difference.

[0063] The exciter of this embodiment has the following advantages: it plays a better role in positioning, ensuring that the diaphragm 2 will not deviate during the vibration process, and the positioning axis moves, and the power can be higher.

[0064] Features of embodiments of the present disclosure are set forth in the following clauses:

[0065] Item 1. An exciter comprising a bracket, a diaphragm, a voice coil and a magnetic circuit assembly for driving the voice coil, wherein the diaphragm and the magnetic circuit assembly are arranged on the bracket; wherein the exciter further comprises a positioning plate and a connecting member; the diaphragm comprises a cone, the cone having an open upper end and a lower end, the upper end being connected to the bracket via a folding ring, and the lower end enclosing a mounting hole that cooperates with the positioning plate; the positioning plate is connected to the lower end of the cone and covers the mounting hole; the upper end of the connecting member is connected to the positioning plate, and the lower end of the connecting member is connected to the magnetic circuit assembly.

[0066] Item 2. An exciter according to Item 1, wherein the positioning plate has a flat fixing portion and a corrugated portion surrounding the fixing portion, the corrugated portion protrudes upward or downward relative to the fixing portion, and the upper end portion of the connecting member is connected to the fixing portion.

[0067] Item 3. The exciter according to Item 2, wherein the corrugated portion has a trough formed by being recessed downward, and the corrugated portion surrounds the fixing portion.

[0068] Item 4. An exciter according to Item 1, wherein an inner sound cavity is provided between the diaphragm and the magnetic circuit assembly, the magnetic circuit assembly is provided with a through hole extending vertically therethrough, and the connecting member is provided with an air vent that connects the through hole and the inner sound cavity.

[0069] Item 5. An exciter according to Item 4, wherein the connecting member includes a base plate and a connecting column extending upward from the middle of the base plate, the connecting column is connected to the positioning plate, the air vent is arranged on the base plate and the outer edge of the base plate is connected to the magnetic circuit assembly.

[0070] Clause 6. The actuator according to clause 5, wherein the vent hole is located between the connecting column and the outer edge of the bottom plate.

[0071] Item 7. An exciter according to Item 6, wherein the outer edge of the base plate is a connecting ring, the connecting ring is connected to the middle of the base plate through a plurality of connecting ribs, and the adjacent connecting ribs form the air vents.

[0072] Clause 8. The exciter according to Clause 4, wherein the exciter further comprises a dustproof net, wherein the dustproof net is arranged between the connecting member and the magnetic circuit assembly, and the dustproof net covers the through hole.

[0073] Clause 9. The exciter according to clause 1 or 4, wherein the positioning piece and the connecting member are located inside the voice coil, and the voice coil is connected to the upper end of the cone.

[0074] Item 10. An exciter according to Item 9, wherein the upper end of the cone is further connected to a circle of flange extending outward and downward; the diaphragm also includes a folding ring fixed to the bracket, the folding ring is arranged around the cone, and the flange is fixedly connected to the folding ring.

[0075] Clause 11. An in-vehicle audio system comprising a tweeter and / or a woofer, wherein the in-vehicle audio system further comprises the exciter according to any one of Clauses 1 to 10.

[0076] As shown in this specification and claims, the terms "comprise" and "include" only indicate the inclusion of the steps and elements that have been explicitly identified, and these steps and elements do not constitute an exclusive list. The method or apparatus may also include other steps or elements.

[0077] Those skilled in the art will understand that, unless otherwise stated, the singular forms "a", "the" and "the" used herein may also include plural forms. It is further understood that "a plurality" in this disclosure refers to two or more, and other quantifiers are similar thereto.

[0078] It will be further understood that the terms "first," "second," and the like are used to describe various types of information, but such information should not be limited to these terms. These terms are used solely to distinguish information of the same type from one another and do not indicate a particular order or level of importance. In fact, the terms "first," "second," and the like are fully interchangeable. For example, first information could be referred to as second information, and similarly, second information could be referred to as first information without departing from the scope of this disclosure.

[0079] In the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0080] The above embodiment is only for illustrating the technical concept and features of the present disclosure and is a preferred embodiment. Its purpose is to enable people familiar with this technology to understand the content of the present disclosure and implement it accordingly, and it cannot be used to limit the scope of protection of the present disclosure.

Claims

1. An exciter, comprising: Bracket; A diaphragm, which is arranged on the support; Voice coil; A magnetic circuit component, which is used to drive the magnetic circuit component of the voice coil, and the magnetic circuit component is arranged on the bracket; A positioning sheet connected to the diaphragm; and A connecting piece, wherein the upper end of the connecting piece is connected to the positioning piece, and the lower end of the connecting piece is connected to the magnetic circuit component.

2. The actuator according to claim 1, characterized in that The positioning piece is connected to the upper surface of the diaphragm, a mounting hole is provided on the diaphragm, the positioning piece covers the mounting hole, and the connecting member is connected to the positioning piece through the mounting hole.

3. The actuator according to claim 2, characterized in that The diaphragm includes a cone having an open upper end and a lower end, the upper end being connected to the bracket via a folding ring, and the lower end enclosing the mounting hole that cooperates with the positioning plate; the positioning plate is connected to the lower end of the cone and covers the mounting hole.

4. The exciter according to any one of claims 1 to 3, characterized in that: The positioning piece has a flat fixing portion and a corrugated portion surrounding the fixing portion, the corrugated portion protrudes upward or downward relative to the fixing portion, and the upper end portion of the connecting member is connected to the fixing portion.

5. The actuator according to claim 4, characterized in that The corrugated portion has a valley formed by being recessed downward, and the corrugated portion surrounds the fixing portion.

6. The exciter according to claim 4, characterized in that The corrugated portion has a wave crest formed by arching upward, and the corrugated portion surrounds the fixing portion.

7. An actuator according to any preceding claim, characterised in that The positioning piece is made of elastic material.

8. The actuator according to claim 7, characterized in that The material of the positioning sheet is rubber.

9. An actuator according to any preceding claim, characterised in that An inner sound cavity is provided between the diaphragm and the magnetic circuit assembly, a through hole is provided on the magnetic circuit assembly which passes through from top to bottom, and an air hole is provided on the connecting member which connects the through hole and the inner sound cavity.

10. The actuator according to claim 9, characterized in that The connecting member includes a bottom plate and a connecting column extending upward from the middle of the bottom plate, the connecting column is connected to the positioning sheet, the air hole is arranged on the bottom plate, and the outer edge of the bottom plate is connected to the magnetic circuit component.

11. The actuator according to claim 10, characterized in that The ventilation hole is located between the connecting column and the outer edge of the bottom plate.

12. The actuator according to claim 11, characterized in that The outer edge of the bottom plate is a connecting ring, and the connecting ring is connected to the middle part of the bottom plate through a plurality of connecting ribs, and the adjacent connecting ribs form the air holes.

13. The actuator according to claim 9, characterized in that The exciter further includes a dustproof net, which is arranged between the connecting member and the magnetic circuit assembly, and covers the through hole.

14. The actuator according to any one of claims 1 to 13, characterized in that The positioning piece and the connecting member are located in the voice coil, and the voice coil is connected to the upper end of the diaphragm.

15. The actuator according to claim 14, characterized in that The upper end of the cone is also connected to a circle of flange extending outward and downward; the diaphragm also includes a folding ring fixed on the bracket, the folding ring is arranged around the cone, and the flange is fixedly connected to the folding ring.

16. An actuator according to any preceding claim, characterised in that The connection between the voice coil and the diaphragm is close to the outer edge of the diaphragm, and the distance between the connection and the outer edge of the diaphragm is less than half of the radius of the diaphragm.

17. A vehicle audio system, comprising a tweeter and / or a woofer, characterized in that: The vehicle audio system further comprises an exciter as claimed in any one of claims 1 to 16.

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