Tweeter and automobile sound system

Abstract

A tweeter and an automobile sound system. The tweeter comprises a frame, a diaphragm arranged on the frame, a voice coil connected to the diaphragm, and a magnetic circuit configured to drive the voice coil to vibrate along the center line of the voice coil, wherein the diaphragm comprises a body and a surround, the body extending along a plane, which is perpendicular to the center line of the voice coil, the body being composed of a flat sheet-shaped carbon material layer, and the surround connecting the body to the frame; and the voice coil is connected to the body. The tweeter has a small volume and wide directivity, also has a smooth frequency response curve in a high-frequency range and low distortion, and particularly offers relatively good listening experience and good sound quality.

Description

Tweeters and car audio systems Related applications

[0001] This application claims priority to Chinese patent application No. CN 2023115665755, filed on November 23, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of automobile speakers, and in particular to a tweeter and an automobile audio system, and more particularly to a diaphragm of a dynamic tweeter. Background Art

[0003] A car audio system is installed in a car and has the function of reproducing sound. The main components of a car audio system are speakers, which generally include tweeters, midrange speakers, woofers, and subwoofers. Tweeters, for example, mostly use a dome-shaped diaphragm. For example, the tweeter disclosed in patent CN208158876U uses a diaphragm that includes a top and a folded ring surrounding the top. The top is shaped like a portion of a spherical shell with an upwardly arched center. The folded ring extends radially outward from the top, thereby circumferentially surrounding the top. The diaphragm is integrally formed. Speakers using this type of diaphragm are larger and have narrow directivity. The response amplitude differs significantly in the direction of the vibration axis and in the direction away from the vibration axis. Summary of the Invention

[0004] The present disclosure relates to a tweeter loudspeaker which is small in size and has wide directivity. At the same time, it has a smooth frequency response curve in the high frequency band and low distortion, and in particular, it has a good listening experience and good sound quality.

[0005] In a first aspect, the present disclosure provides a tweeter loudspeaker, comprising:

[0006] Bracket;

[0007] a diaphragm, which is arranged on the bracket;

[0008] a voice coil connected to the diaphragm; and

[0009] a magnetic circuit for driving the voice coil to vibrate along its center line;

[0010] The diaphragm includes a main body and a folding ring. The main body extends along a plane. The plane and the center line of the voice coil are perpendicular to each other. The main body is composed of a flat sheet of carbon material layer. The folding ring connects the main body to the bracket. The voice coil is connected to the main body.

[0011] In one embodiment, the carbon material layer is a thin film formed by deposition of carbon atoms.

[0012] In one embodiment, the body is formed by deposition of hydrogen and methane.

[0013] In one embodiment, the main body is formed by depositing hydrogen and methane on the horizontal surface of the blank in a vacuum chamber through plasma chemical vapor deposition.

[0014] In one embodiment, the thickness of the main body is 0.01-0.10 mm, and the Young's modulus of elasticity is 1000-1200 GPa.

[0015] In one embodiment, the folding ring is elastic.

[0016] In one embodiment, the center line of the voice coil extends in the up-down direction, and the main body is arranged horizontally; the folding ring has an outer hanging edge, an inner connecting edge and an arched portion located between the outer hanging edge and the inner connecting edge, the arched portion is arched upward, the outer hanging edge is fixedly connected to the bracket, and the inner connecting edge is fixedly connected to the main body.

[0017] In one embodiment, the inner connecting edge is fixedly connected to the upper surface of the main body.

[0018] In one embodiment, the material of the folding ring includes rubber, cloth, silk or PET (polyethylene terephthalate).

[0019] In one embodiment, the arched portion has a plurality of recessed grooves extending downward, and the plurality of recessed grooves are evenly distributed along the circumference of the diaphragm.

[0020] In one embodiment, the main body is higher than the outer hanging edge, and the folding ring further has a transition portion located between the arched portion and the inner connecting edge, the transition portion is recessed downward relative to the inner connecting edge, and the main body is higher than the transition portion.

[0021] In one embodiment, the speaker further comprises a mask covering the diaphragm, and the mask is provided with a sound-transmitting hole.

[0022] In one embodiment, the tweeter is a dynamic coil speaker. The principle of a dynamic coil speaker is to use the strength and direction of current flowing through a metal coil to generate a magnetic field, which in turn attracts or repels adjacent magnets, driving the diaphragm to vibrate and produce sound. This differs significantly from a planar transducer (a flat sound-emitting unit). Planar transducers (planar sound-emitting units) utilize the isomagnetic principle. Unlike the circular magnets of a dynamic coil, the flat magnets are parallel and located on either side of the diaphragm, like two flat plates sandwiching the diaphragm. The diaphragm is also covered with a thin layer of metal conductor, typically printed or cut to create a zigzag pattern that folds back and forth across the diaphragm. When a current signal passes through it, it is electromagnetically forced to move within the gap between the two flat magnets, producing sound. The diaphragm and magnetic circuit are complex in structure, making processing and assembly difficult and costly. The tweeter disclosed herein is less expensive than a planar transducer and is easier to process and assemble.

[0023] In a second aspect, the present disclosure provides a car audio system, comprising a tweeter sound unit, wherein the tweeter sound unit comprises the tweeter speaker.

[0024] In a third aspect, the present disclosure provides a diaphragm for a tweeter speaker, which has the advantages of high hardness, high thermal conductivity, high sound velocity, and good insulation.

[0025] The diaphragm comprises a main body and a folding ring, wherein the main body extends along a plane and is composed of a flat sheet-like carbon material layer. The folding ring is arranged around the main body and is used to connect the main body to a bracket of a loudspeaker.

[0026] Furthermore, the main body is in the shape of a horizontal sheet or a flat plate.

[0027] Furthermore, the carbon material layer is formed by depositing carbon atoms.

[0028] Furthermore, the main body is formed by depositing hydrogen and methane.

[0029] Furthermore, the main body is formed by depositing hydrogen and methane on the horizontal surface of the blank in a vacuum chamber through a plasma chemical vapor deposition method.

[0030] Furthermore, the thickness of the main body is 0.01-0.10 mm, and the Young's modulus of elasticity is 1000-1200 GPa.

[0031] Furthermore, the folding ring is elastic.

[0032] Furthermore, the main body is arranged horizontally; the folding ring has an outer hanging edge, an inner connecting edge and an arched portion located between the outer hanging edge and the inner connecting edge, the arched portion is arched upward, the outer hanging edge is fixedly connected to the bracket, and the inner connecting edge is fixedly connected to the main body.

[0033] Furthermore, the inner connecting edge is fixedly connected to the upper surface of the main body.

[0034] Furthermore, the material of the folding ring includes rubber, cloth, silk or PET, and the arched portion has a plurality of recessed grooves extending downward, and the plurality of recessed grooves are evenly distributed along the circumferential direction of the diaphragm.

[0035] Furthermore, the main body is higher than the outer hanging edge, and the folding ring also has a transition portion located between the arched portion and the inner connecting edge, the transition portion is recessed downward relative to the inner connecting edge, and the main body is higher than the transition portion.

[0036] The diaphragm used in the tweeter of the present invention is lightweight and has a large elastic modulus. The main body of the diaphragm is a flat diaphragm. The entire speaker is small in size and has wide directivity. At the same time, the frequency response curve in the high frequency band is smooth, especially in the mid-to-high frequency band of about 1.6 kHz to 20 kHz. The frequency response curve is relatively smooth; the distortion is low (the distortion in the frequency band after 1.0 kHz is less than 1%), and it has a particularly good listening experience and good sound quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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.

[0038] FIG1 is a top view of a tweeter according to an embodiment of the present disclosure.

[0039] FIG2 is a cross-sectional view taken along line AA in FIG1 .

[0040] FIG3 is a perspective view of a diaphragm according to an embodiment of the present disclosure.

[0041] FIG4 is a front view of a diaphragm according to an embodiment of the present disclosure.

[0042] FIG5 is a partial enlarged view of point A in FIG4 .

[0043] Figure 6 is a comparison of the frequency response curves of four tweeters.

[0044] Figure 7 is a comparison of the distortion curves of four tweeters.

[0045] In the above figures,

[0046] 1 - Bracket; 2 - Diaphragm; 21 - Main body; 22 - Folding ring; 220 - Recessed groove; 221 - Outer hanging edge; 222 - Arched part; 223 - Transition part; 224 - Inner connecting edge; 3 - Voice coil; 4 - Magnetic circuit; 41 - U iron; 42 - Magnet; 43 - Front piece; 5 - Mask; 51 - Connecting strip. DETAILED DESCRIPTION

[0047] 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.

[0048] In this disclosure, 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 loudspeaker's structure and are not intended to define the state of the loudspeaker after installation. For example, a loudspeaker can be mounted on a horizontal, inclined, or vertical surface of a vehicle. Example

[0049] Figures 1 and 2 illustrate a tweeter according to this embodiment. This tweeter can be used as a tweeter unit in a home speaker or car audio system. The sound emitted by this tweeter is concentrated in the frequency range of 2.0 kHz to 20 kHz. This tweeter is a dynamic speaker, utilizing the sound generation mechanism of a dynamic speaker with a transmission. This embodiment also relates to a car audio system, comprising a tweeter unit, a midrange unit, and a woofer unit. The tweeter unit includes the tweeter shown in Figures 1 and 2.

[0050] As shown in Figures 1 and 2, the tweeter includes a bracket 1, a diaphragm 2, a voice coil 3, a magnetic circuit 4, and a mask 5. The bracket 1 and mask 5 together form the tweeter's outer shell or frame, providing sufficient strength to support and protect internal components such as the diaphragm 2, voice coil 3, and magnetic circuit 4. The bracket 1 and mask 5 are each integrally molded from plastic; for example, the bracket 1 is integrally injection-molded from PC (polycarbonate). The diaphragm 2 and magnetic circuit 4 are fixed to the bracket 1. The voice coil 3 is connected to the diaphragm 2, with one end of the voice coil 3 movably inserted into the magnetic gap of the magnetic circuit 4 along its centerline. When the voice coil 3 is energized and connected to a sound source signal, the magnetic field of the magnetic circuit 4 drives the voice coil 3 to vibrate back and forth along its centerline, thereby driving the diaphragm 2 to vibrate back and forth, producing sound.

[0051] As shown in Figure 2, the centerline of voice coil 3 extends vertically, which also serves as the vibration axis of diaphragm 2 (speaker). Diaphragm 2 is fixed to the upper end of bracket 1, and magnetic circuit 4 is fixedly connected to the lower end of bracket 1. A closed air gap is formed between bracket 1, diaphragm 2, and magnetic circuit 4. A mask 5 is fixed to bracket 1 and positioned above diaphragm 2.

[0052] Figures 3 to 5 illustrate a diaphragm 2 according to this embodiment. As shown in Figures 3 to 5 , the diaphragm 2 includes a main body 21 and a fold 22. The main body 21 extends along a plane, with the plane and the centerline of the voice coil 3 being perpendicular to each other. In other words, the main body 21 is horizontally disposed and has a flat, thin sheet-like shape. The fold 22 connects the main body 21 to the bracket 1, and the voice coil 3 is specifically connected to the main body 21 of the diaphragm 2.

[0053] Furthermore, the main body 21 is composed of a flat, sheet-like carbon material layer, which is a thin film formed by depositing carbon atoms. The main body 21 (the carbon material film) is formed by depositing hydrogen and methane onto the horizontal surface of the mold in a vacuum chamber via plasma chemical vapor deposition. This diaphragm 2 has advantages such as high hardness, high thermal conductivity, high sound velocity, and good insulation. The diaphragm 2 is specifically prepared by the following steps:

[0054] (1) Obtaining the main body 21 of the diaphragm 2 by plasma chemical vapor deposition;

[0055] (2) The main body 21 and the folding ring 22 are bonded together and then hot-pressed to form the body.

[0056] In step (1), high-purity hydrogen and methane are introduced into a vacuum chamber and heated to 1800-2500°C (typically 2000°C) to decompose the methane gas; a blank having a horizontal surface (such as a silicon wafer, etc.) is placed in the vacuum chamber, and the temperature of the surface is 800-1000°C (typically 800°C); carbon atoms formed by the decomposition of methane are deposited on the surface of the blank under the action of plasma until the desired thickness is reached, and the deposited carbon material layer is removed from the blank to obtain the main body 21. The use of plasma chemical vapor deposition to deposit the carbon material layer is not the key point of the invention of this application, and known PECVD methods and equipment can be used, which will not be described in detail herein.

[0057] Furthermore, the thickness of the main body 21 is 0.01-0.10 mm, and the Young's modulus of elasticity is 1000-1200 GPa. Typically, in this embodiment, the thickness of the main body 21 is 0.05 mm, and the Young's modulus of elasticity is 1050 GPa.

[0058] The folding ring 22 is elastic and is preferably made of a rubber material. As shown in Figures 3 and 5, the folding ring 22 has an outer hanging edge 221, an inner connecting edge 224, a raised portion 222 located between the outer hanging edge 221 and the inner connecting edge 224, and a transition portion 223. The outer hanging edge 221 and the inner connecting edge 224 are parallel to each other, the raised portion 222 is arched upward, and the transition portion 223 is recessed downward. In other words, the folding ring 22 includes the outer hanging edge 221, the raised portion 222, the transition portion 223, and the inner connecting edge 224, which are arranged in sequence from the outside to the inside. The outer hanging edge 221 is arranged horizontally and fixedly connected to the bracket 1, specifically, it is adhesively fixed between the bracket 1 and the mask 5. The raised portion 222 is arched upward relative to the outer hanging edge 221, and the raised portion 222 has a plurality of recessed grooves 220 extending downward. The plurality of recessed grooves 220 are evenly distributed along the circumference of the diaphragm 2. The length direction (i.e., the extension direction) of the recessed groove does not coincide with the diameter direction of the diaphragm 2, and the angle between the two is between 20 and 80 degrees. The transition portion 223 is recessed downward relative to the arched portion 222 and the inner connecting edge 224. The inner connecting edge 224 is arranged horizontally and parallel to the main body 21. The inner connecting edge 224 is fixedly connected to the upper surface of the main body, specifically by gluing and then hot pressing to set the shape. The main body 21 is higher than the outer overhang 221 and the transition portion 223. In other words, the inner connecting edge 224 of the fold 22 is higher than the outer overhang 221.

[0059] Magnetic circuit 4 comprises a U-shaped iron 41, a magnet 42, and a front plate 43. U-shaped iron 41 is fixedly connected to the lower portion of bracket 1 and, together with bracket 1 and diaphragm 2, forms a closed air gap. Magnet 42 and front plate 43 are disposed within U-shaped iron 41, with magnet 42 secured to the bottom of U-shaped iron 41 and front plate 43 laminated and secured to the top of magnet 42. A magnetic gap is formed between the inner surface of U-shaped iron 41 and the outer surfaces of magnet 42 and front plate 43, allowing insertion of voice coil 3.

[0060] The mask 5 includes a plurality of intersecting connecting strips 51 , and sound-permeable holes are formed between the connecting strips 51 for allowing air to flow so that the diaphragm 2 can radiate sound outward.

[0061] Comparative Example 1

[0062] Comparative Example 1 provides a tweeter speaker, differing from the embodiment only in the shape and material of the diaphragm 2; otherwise, it is identical to the embodiment. Specifically, the diaphragm 2 of Comparative Example 1 also consists of a main body 21 and a surround 22. The surround 22 is identical to the embodiment (material and shape). However, the main body 21 is shaped like an upwardly arched dome, forming part of a spherical shell. The main body 21 is made of two layers: one is a rubber substrate (specifically, a PET film), and the other is a 0.05mm thick layer of deposited carbon material coated on the rubber substrate.

[0063] Comparative Example 2

[0064] Comparative Example 2 provides a tweeter speaker, differing from the embodiment only in the shape and material of the diaphragm 2; otherwise, it is identical to the embodiment. Specifically, the diaphragm 2 of Comparative Example 2 also consists of a main body 21 and a surround 22. The surround 22 is identical to the embodiment (material and shape). However, the main body 21 is shaped like an upwardly arched dome, forming part of the spherical shell. The main body 21 is made of polypropylene (PP) and is integrally injection-molded.

[0065] Comparative Example 3

[0066] Comparative Example 3 provides a tweeter speaker, which differs from the embodiment only in the material of the diaphragm 2; otherwise, it is identical to the embodiment. Specifically, the diaphragm 2 of Comparative Example 3 also consists of a main body 21 and a surround 22. The surround 22 is identical to the embodiment (material and shape). The main body 21 is also flat, but is made of polypropylene (PP) and is integrally injection-molded.

[0067] Performance testing and comparison:

[0068] Sound performance tests were conducted on the tweeters of the embodiment and comparative examples 1 to 3. These four tweeters had identical specifications and testing conditions. Figure 6 shows the frequency response curves of the four tweeters. It can be seen that within the high-frequency band of approximately 1.6 kHz to 20 kHz, the frequency response curve of the tweeter of the embodiment is smoother and exhibits less fluctuation than that of comparative examples 1 to 3. Figure 7 shows the distortion curves of the four tweeters. It can be seen that the distortion of the tweeter of the embodiment is lower than that of comparative examples 1 to 3 across the entire high-frequency band, and the distortion of the tweeter of the embodiment in the frequency band above 1.0 kHz is less than 1%.

[0069] In addition, during the actual listening test, the inventors found that the tweeter (Comparative Example 3) using a conventional PP flat diaphragm with a flat main body 21 sometimes produced a sharp and harsh sound; however, the tweeter of the embodiment did not have this problem and provided a better listening experience.

[0070] The diaphragm of this embodiment and the tweeter using this diaphragm have the following advantages: a faster sound velocity; a lighter diaphragm with a larger elastic modulus; a relatively smooth frequency response curve with lower distortion; and excellent sound quality, good off-axis response, and wide directivity. "Directivity" describes how a speaker's frequency response varies with off-axis angles. A speaker with wide directivity is one whose on-axis and off-axis responses maintain substantially consistent amplitude (SPL) over a relatively large range. A speaker with narrow directivity is one whose on-axis and off-axis amplitudes differ significantly (i.e., a narrow dispersion angle).

[0071] Features of embodiments of the present disclosure are set forth in the following clauses:

[0072] A tweeter includes a bracket, a diaphragm mounted on the bracket, a voice coil connected to the diaphragm, and a magnetic circuit for driving the voice coil to vibrate along its centerline. The diaphragm includes a main body and a folded ring. The main body extends along a plane, the plane and the centerline of the voice coil are perpendicular to each other, and the main body is composed of a flat, flaky carbon material layer. The folded ring connects the main body to the bracket. The voice coil is connected to the main body.

[0073] The tweeter according to clause 1, wherein the carbon material layer is a thin film formed by deposition of carbon atoms.

[0074] The tweeter of clause 2, wherein the body is formed from hydrogen and methane deposition.

[0075] The tweeter according to clause 3, wherein the body is formed by depositing hydrogen and methane on the horizontal surface of the blank by plasma chemical vapor deposition in a vacuum chamber.

[0076] The tweeter according to clause 1, wherein the body has a thickness of 0.01 to 0.10 mm and a Young's modulus of elasticity of 1000 to 1200 GPa.

[0077] The tweeter according to clause 1, wherein the surround is elastic.

[0078] The tweeter according to clause 6, wherein the center line of the voice coil extends in the up-down direction, and the main body is arranged horizontally; the folding ring has an outer hanging edge, an inner connecting edge and an arched portion located between the outer hanging edge and the inner connecting edge, the arched portion is arched upward, the outer hanging edge is fixedly connected to the bracket, and the inner connecting edge is fixedly connected to the main body.

[0079] The tweeter according to clause 7, wherein the inner connecting edge is fixedly connected to the upper surface of the main body.

[0080] The tweeter according to clause 7, wherein the material of the folding ring comprises rubber, cloth, silk or PET, the arched portion has a plurality of recessed grooves extending downward, and the plurality of recessed grooves are evenly distributed along the circumference of the diaphragm.

[0081] The tweeter according to clause 7, wherein the main body is higher than the outer hanging edge, the folding ring further has a transition portion located between the arched portion and the inner connecting edge, the transition portion is recessed downward relative to the inner connecting edge, and the main body is higher than the transition portion.

[0082] The tweeter according to clause 1, wherein the speaker further comprises a mask covering the diaphragm, the mask being provided with a sound-transmitting hole.

[0083] A diaphragm for a tweeter according to any one of clauses 1 to 11.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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. A tweeter, comprising: Bracket; A diaphragm, which is arranged on the support; a voice coil connected to the diaphragm; and A magnetic circuit, which is used to drive the voice coil to vibrate along its own center line; The diaphragm includes a main body and a folding ring, the main body extends along a plane, the plane and the center line of the voice coil are perpendicular to each other, the main body is composed of a flat sheet of carbon material layer; the folding ring connects the main body to the bracket; the voice coil is connected to the main body.

2. The tweeter according to claim 1, characterized in that The carbon material layer is a thin film formed by the deposition of carbon atoms.

3. The tweeter according to claim 2, characterized in that: The body is formed by deposition of hydrogen and methane.

4. The tweeter according to claim 3, characterized in that: The main body is formed by depositing hydrogen and methane on the horizontal surface of the blank in a vacuum chamber through a plasma chemical vapor deposition method.

5. A tweeter according to any preceding claim, characterised in that The thickness of the main body is 0.01-0.10 mm, and the Young's elastic modulus is 1000-1200 GPa.

6. The tweeter according to claim 1, characterized in that The folding ring is elastic.

7. A tweeter according to any preceding claim, characterised in that The center line of the voice coil extends in the up-down direction, and the main body is arranged horizontally; the folding ring has an outer hanging edge, an inner connecting edge and an arched portion located between the outer hanging edge and the inner connecting edge, the arched portion is arched upward, the outer hanging edge is fixedly connected to the bracket, and the inner connecting edge is fixedly connected to the main body.

8. The tweeter according to claim 7, characterized in that: The inner connecting edge is fixedly connected to the upper surface of the main body.

9. The tweeter speaker according to claim 7, characterized in that: The material of the folding ring includes rubber, cloth, silk or PET.

10. The tweeter speaker according to claim 7, characterized in that: The arched portion has a plurality of concave grooves extending downward, and the plurality of concave grooves are evenly distributed along the circumferential direction of the diaphragm.

11. The tweeter speaker according to claim 7, characterized in that: The main body is higher than the outer hanging edge, the folding ring further has a transition portion between the arched portion and the inner connecting edge, the transition portion is recessed downward relative to the inner connecting edge, and the main body is higher than the transition portion.

12. A tweeter according to any preceding claim 1, characterized in that The loudspeaker further comprises a mask which is arranged on the diaphragm, and the mask is provided with a sound-transmitting hole.

13. A tweeter according to any preceding claim, characterised in that The tweeter is a dynamic loudspeaker.

14. A car audio system, comprising a tweeter unit, characterized in that: The tweeter sound unit comprises the tweeter loudspeaker as claimed in any one of claims 1 to 13.

Images