Treble loudspeaker

Abstract

A treble loudspeaker, comprising a U-shaped magnet assembly (1), a closed annular frame (2), a vibration assembly (3), a closed annular peripheral wall (4), and breathable meshes (5). The closed annular frame (2) surrounds the periphery of the U-shaped magnet assembly (1), the cross section of the closed annular frame (2) in the circumferential direction thereof is a U-shaped cross section, and the bottom of the U-shaped cross section is closer to the U-shaped magnet assembly (1) than the top of the U-shaped cross section; the vibration assembly (3) comprises a suspension member (31) and a diaphragm (32), the suspension member (31) is connected to the periphery of the diaphragm (32) in a surrounding manner, the diaphragm (32) is connected to the closed annular frame (2) by means of the suspension member (31), and the diaphragm (32), the suspension member (31), the closed annular frame (2) and the U-shaped magnet assembly (1) define a front cavity; the closed annular peripheral wall (4) surrounds the periphery of the closed annular frame (2), and the closed annular peripheral wall (4) seals the top of the U-shaped cross section of the closed annular frame (2), so that a back cavity (100) is formed between the closed annular peripheral wall (4) and the closed annular frame (2); the closed annular frame (2) is provided with communication ports (24) communicated with the front cavity and the back cavity (100), and the breathable meshes (5) are arranged at the communication ports (24).

Description

tweeter

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 26, 2024, with application number 202420351928.3, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of audio equipment, for example, to a tweeter. Background Art

[0003] A speaker is a transducer device that converts electrical signals into sound signals.

[0004] For the tweeter, by designing the front and rear cavity structures, specifically, the front cavity and the rear cavity are connected through a port to form a Helmholtz resonator system, which is beneficial to lowering the resonant frequency F0 of the tweeter, increasing the effective low-frequency bandwidth, and making the tweeter sound softer.

[0005] In related technologies, sound-absorbing cotton blocks are also arranged in the rear cavity and blocked at the port. When the diaphragm vibrates and makes sound, the sound-absorbing cotton blocks are compressed due to the vibration of the air, and the sound-absorbing cotton blocks damp the airflow to further reduce the resonance frequency F0 of the speaker.

[0006] However, the arrangement of the sound-absorbing cotton blocks directly affects the volume of the rear cavity, which conflicts with the original intention of the front and rear cavity structural design, which in turn causes F0 to increase. Summary of the Invention

[0007] The purpose of this application is to provide a tweeter speaker that avoids the arrangement of sound-absorbing cotton blocks affecting the structural design of the front and rear cavities, reduces the resonance frequency F0, widens the effective low-frequency bandwidth, and makes the listening experience softer.

[0008] To achieve this goal, this application adopts the following technical solutions:

[0009] tweeter, including:

[0010] U-shaped magnet assembly;

[0011] a closed ring frame surrounding the outer periphery of the U-shaped magnet assembly, wherein the cross-section of the closed ring frame along its circumference is a U-shaped cross-section, and the bottom of the U-shaped cross-section is closer to the U-shaped magnet assembly than the top thereof;

[0012] A vibration assembly includes a suspension member and a diaphragm, wherein the suspension member is connected to the outer periphery of the diaphragm, and the diaphragm is connected to the closed ring frame through the suspension member. The diaphragm, the suspension member, the closed ring frame and the U-shaped magnet assembly are arranged to form a front cavity;

[0013] A closed-loop outer peripheral wall surrounds the outer periphery of the closed-loop frame, the closed-loop outer peripheral wall seals the top of the U-shaped cross-section of the closed-loop frame, thereby forming a back cavity between the closed-loop outer peripheral wall and the closed-loop frame, and a communication port is provided on the closed-loop frame to connect the front cavity and the back cavity, and the front cavity, the back cavity and the communication port form a Helmholtz resonator system;

[0014] The breathable mesh is arranged at the communicating opening.

[0015] As an optional embodiment of the tweeter, the closed-ring frame includes a first ring plate, a second ring plate and a closed-ring inner circumferential wall. The first ring plate and the second ring plate are arranged at intervals. The closed-ring inner circumferential wall is connected to the inner circle of the first ring plate and the inner circle of the second ring plate. The first ring plate, the second ring plate and the closed-ring inner circumferential wall together form a U-shaped cross-section. The closed-ring inner circumferential wall surrounds the outer circle of the U-shaped magnet assembly. The closed-ring outer circumferential wall surrounds the outer circle of the first ring plate and the outer circle of the second ring plate. A back cavity is formed between the closed-ring outer circumferential wall, the first ring plate, the second ring plate and the closed-ring inner circumferential wall. The suspension is connected to the first ring plate. The diaphragm, the suspension, the first ring plate and the U-shaped magnet assembly form a front cavity. The connecting port is opened on the first ring plate.

[0016] As an optional embodiment of the tweeter, there are at least two communication ports, all of which are evenly distributed along the circumference of the first ring plate. The number of breathable meshes is consistent with the number of communication ports and they correspond one to one. The breathable meshes are arranged at the corresponding communication ports.

[0017] As an optional embodiment of the tweeter, the breathable mesh is located in the front cavity and attached to the first ring plate.

[0018] As an optional embodiment of the tweeter, a breathable mesh is embedded in the communication port.

[0019] As an optional embodiment of the tweeter, it also includes a narrow air duct, and a through hole connected to the back cavity is provided on the closed ring outer wall or the second ring plate. One end of the narrow air duct is connected to the through hole, and the other end is connected to the outside.

[0020] As an optional embodiment of the tweeter, a narrow groove is provided on the end surface of the second ring plate facing away from the first ring plate or on the outer side surface of the closed ring outer wall, and a through hole is provided in the narrow groove and is located at one end of the narrow groove in the length direction. Except for the end of the narrow groove away from the through hole in the length direction, the slot closure covers the slot of the rest of the narrow groove to form a narrow air duct.

[0021] As an optional embodiment of the tweeter, the slot closing piece is a closing patch, and the closing patch is attached to the second ring plate or the closed ring outer peripheral wall.

[0022] As an alternative embodiment of the tweeter, the sealing patch is a polyethylene terephthalate sheet.

[0023] As an alternative embodiment of the tweeter, the diaphragm is dome-shaped. Beneficial effects:

[0024] In the tweeter provided in this embodiment, a back cavity formed by a closed-loop frame and a closed-loop outer wall surrounds the U-shaped magnet assembly. The overall structure of the back and front cavities is compact, and the presence of the back cavity does not increase the overall height or diameter of the speaker, facilitating a two-cavity design in a compact design. Furthermore, a sheet-like breathable mesh is provided at the connecting port. The mesh is extremely small and takes up virtually no volume in the back or front cavities, thereby lowering the resonant frequency F0 and widening the effective low-frequency bandwidth for a softer listening experience. The mesh itself has a specific mesh count, which acts as a buffer for airflow, preventing local standing waves, resulting in a smoother frequency response curve and better vibration stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is an assembly structure diagram of a tweeter provided in an embodiment of the present application;

[0026] FIG2 is an exploded view of a tweeter provided in an embodiment of the present application;

[0027] FIG3 is a second exploded view of a tweeter provided in an embodiment of the present application;

[0028] FIG4 is a schematic structural diagram of a breathable mesh provided in an embodiment of the present application attached to a closed ring frame;

[0029] FIG5 is an exploded view of the breathable mesh and the closed ring frame provided in an embodiment of the present application;

[0030] FIG6 is a schematic structural diagram of a notch closure member provided in an embodiment of the present application attached to a closed ring frame;

[0031] FIG7 is an exploded view of a slot closure and a closed ring frame provided in an embodiment of the present application;

[0032] FIG8 is a comparison diagram of the frequency response curves of the technical solution of this embodiment and the technical solution of placing a sound-absorbing cotton block in a back cavity in the background art.

[0033] In the figure: 1. U-shaped magnet assembly; 11. U-iron seat; 12. Magnet sheet; 13. Magnetic conductive sheet; 2. Closed-ring frame; 21. First ring plate; 22. Second ring plate; 23. Closed-ring inner wall; 24. Connecting port; 3. Vibration assembly; 31. Suspension member; 32. Diaphragm; 4. Closed-ring outer wall; 5. Breathable mesh; 6. Slot closure; 7. Voice coil; 8. Mask; 100. Back cavity; 101. Narrow air duct; 102. Through hole; 103. Narrow groove. DETAILED DESCRIPTION

[0034] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present application and are not intended to limit the present application. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions of the present application, not all of the structures.

[0035] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0036] In this application, 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 may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0038] 1 and 2 , this embodiment provides a tweeter loudspeaker, which includes a U-shaped magnet assembly 1 , a closed-ring frame 2 , a vibration assembly 3 , a closed-ring outer peripheral wall 4 and a breathable mesh 5 .

[0039] As shown in Figures 2 and 3, specifically, in this embodiment, a U-shaped magnet assembly 1 is used instead of a T-shaped magnet structure to meet the driving force requirements under a small structural design. The U-shaped magnet assembly 1 can include a U-iron base 11, a magnet sheet 12, and a magnetic conductive sheet 13. The U-iron base 11 includes a connected bottom plate portion and a cylindrical portion, the magnetic conductive sheet 13 is on top, and the magnet sheet is on the bottom. The magnet sheet and the magnetic conductive sheet 13 are stacked in the U-iron base 11, thereby forming a uniform magnetic field in the U-iron base 11.

[0040] The closed ring frame 2 surrounds the outer circumference of the U-shaped magnet assembly 1. The cross-section of the closed ring frame 2 along its circumference is a U-shaped cross-section, and the bottom of the U-shaped cross-section is closer to the U-shaped magnet assembly 1 than the top. The shape of the closed ring frame 2 can be circular, rectangular, triangular, or irregular.

[0041] As shown in Figure 2, the vibration assembly 3 includes a suspension member 31 and a diaphragm 32. The suspension member 31 is connected to the outer periphery of the diaphragm 32, and the diaphragm 32 is connected to the closed ring frame 2 through the suspension member 31. The diaphragm 32, the suspension member 31, the closed ring frame 2 and the U-shaped magnet assembly 1 are arranged to form a front cavity. In this embodiment, the suspension member 31 is a folded ring, which is used to fix the position of the diaphragm 32 and control the movement of the diaphragm 32. Optionally, the diaphragm 32 is dome-shaped to improve the high-frequency extension of the tweeter. The diaphragm 32 and the folded ring can be an integrated structure or a split structure, which is not limited here.

[0042] As shown in Figure 3 , the tweeter also includes a voice coil 7, which is connected to the vibrating assembly 3. The voice coil 7 is located around the magnet sheet 12 and the magnetic conductive sheet 13, and is positioned within the cylindrical portion of the U-shaped iron base 11. When an alternating current flows through the voice coil 7, a magnetic field is generated around it based on the principle of electromagnetism. The polarity of the magnetic field generated by the voice coil 7 changes repeatedly with the direction of the current, causing the voice coil 7 to vibrate back and forth relative to the U-shaped magnet assembly 1, driving the vibrating assembly 3 to generate sound waves.

[0043] The closed-loop outer wall 4 surrounds the outer periphery of the closed-loop frame 2, and the closed-loop outer wall 4 seals the top of the U-shaped cross-section of the closed-loop frame 2, thereby forming a back cavity 100 between the closed-loop outer wall 4 and the closed-loop frame 2. The back cavity 100 and the front cavity formed in this way have a compact overall structure. The existence of the back cavity 100 does not increase the total height or diameter of the speaker, which is conducive to realizing a two-cavity structure design in a small size.

[0044] The closed ring frame 2 is provided with a connecting port 24 connecting the front cavity and the back cavity 100. The front cavity, the back cavity 100 and the connecting port 24 form a Helmholtz resonator system, which is beneficial to reducing the resonance frequency F0 of the tweeter, increasing the effective low-frequency bandwidth, making the tweeter sound softer, avoiding excessive reduction of the diaphragm 32 rigidity in order to adjust F0, improving power resistance performance, and improving high-frequency extension.

[0045] A breathable mesh 5 is provided at the communication port 24. The mesh 5 has a specific mesh count, which blocks direct air flow between the front and back cavities 100. This slows the airflow between the front and back cavities 100 during speaker operation, acting as a buffer, preventing local standing waves and resulting in a smoother frequency response curve and improved vibration stability. The mesh 5 is sheet-shaped and extremely small, occupying virtually no volume in the back or front cavities 100. This helps lower the resonant frequency F0, widens the effective low-frequency bandwidth, and softens the listening experience.

[0046] The material of the breathable mesh 5 can be any one or more combinations of polycarbonate, polyamide, acrylonitrile-butadiene-styrene copolymer, polystyrene, polypropylene, polyethylene terephthalate, polyvinyl chloride, polyurethane, polyethylene, phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, polyarylate, polyetherimide, polyimide, polyethylene naphthalate, polyetheretherketone, silicone, cloth, etc.

[0047] The breathable mesh 5 is preferably a waterproof mesh, that is, the properties of the breathable mesh 5 do not change after contacting water, thereby avoiding affecting the sound effect of the speaker in a humid environment.

[0048] 1 and 2 , the tweeter further includes a mask 8, which is disposed on the side of the diaphragm 32 facing away from the closed-loop frame 2 to protect the diaphragm 32. In this embodiment, the mask 8 is integrally formed with the closed-loop outer peripheral wall 4 to form a housing.

[0049] As shown in the combined body Figures 2 to 7, the structural design of the closed ring frame 2 is as follows: the closed ring frame 2 includes a first ring plate 21, a second ring plate 22 and a closed ring inner peripheral wall 23. The first ring plate 21 and the second ring plate 22 are arranged at intervals. The closed ring inner peripheral wall 23 is connected to the inner ring of the first ring plate 21 and the inner ring of the second ring plate 22. The first ring plate 21, the second ring plate 22 and the closed ring inner peripheral wall 23 together form a U-shaped cross-section. The closed ring inner peripheral wall 23 surrounds the outer periphery of the U-shaped magnet assembly 1, that is, surrounds the outer periphery of the U iron seat 11. Closed-loop outer peripheral wall 4 surrounds the outer rings of first ring plate 21 and second ring plate 22. A back cavity 100 is formed between closed-loop outer peripheral wall 4, first ring plate 21, second ring plate 22, and closed-loop inner peripheral wall 23. Suspension member 31 is connected to first ring plate 21. Diaphragm 32, suspension member 31, first ring plate 21, and U-shaped magnet assembly 1 form a front cavity. Communication port 24 is provided on first ring plate 21. By specifying the structure of closed-loop frame 2, a compact design of back cavity 100 and front cavity is achieved.

[0050] In this embodiment, the first ring plate 21, the second ring plate 22, and the closed-ring inner peripheral wall 23 are integrally formed to form a closed-ring frame 2 having a communication port 24 and the elongated groove 103 described below, requiring no assembly. In other embodiments, the first ring plate 21, the second ring plate 22, and the closed-ring inner peripheral wall 23 may be formed separately and then connected to form the closed-ring frame 2.

[0051] The shapes of the first and second ring plates 21, 22 are not limited and can be square, triangular, or other shapes. The cross-sectional shape of the closed-loop inner peripheral wall 23 is identical to the profile of the inner ring of the first ring plate 21, and the cross-sectional shape of the closed-loop outer peripheral wall 4 is identical to the profile of the outer ring of the first ring plate 21. In this embodiment, the first and second ring plates 21, 22 are circular rings of identical shape and size. The inner rings of the first and second ring plates 21, 22 are aligned vertically. The upper end of the closed-loop inner peripheral wall 23 is connected to the first ring plate 21, and the lower end of the closed-loop inner peripheral wall 23 is connected to the second ring plate 22.

[0052] As shown in Figures 4 and 5 , preferably, at least two communication openings 24 are provided, all of which are evenly distributed along the circumference of the first ring plate 21. The number of air-permeable meshes 5 matches the number of communication openings 24, and the air-permeable meshes 5 are positioned at their corresponding communication openings 24. The even distribution of at least two communication openings 24 along the circumference significantly avoids uneven air pressure within the back cavity 100 caused by a single communication opening 24, thereby preventing swaying of the diaphragm 32, improving the balance of the diaphragm 32 during vibration, and preventing distortion.

[0053] Evenly distributing two or more communication openings 24 is only meaningful if the breathable mesh 5 takes up almost no volume of the front and back cavities 100. Conversely, if sound-absorbing cotton pads are placed in the back cavity 100, increasing the number of communication openings 24 will also increase the number of sound-absorbing cotton pads, significantly reducing the volume of the back cavity 100 and defeating the technical purpose of providing the back cavity 100.

[0054] The damping of the air flow can be adjusted by adjusting and matching the diameter of the communication opening 24 and the mesh number of the breathable mesh 5. The shape of the communication opening 24 is not limited. In this embodiment, the communication opening 24 is a long arc-shaped hole.

[0055] As shown in Figures 4 and 5 , in this embodiment, the breathable mesh 5 is located within the front cavity and attached to the first ring plate 21. The breathable mesh 5 does not occupy any volume of the back cavity 100, maximizing the volume of the back cavity 100. Furthermore, the breathable mesh 5 occupies minimal volume of the front cavity. The breathable mesh 5 is attached to the first ring plate 21, which helps maintain low production costs. For example, the breathable mesh 5 can be glued to the first ring plate 21.

[0056] In another embodiment, the breathable mesh 5 is embedded in the communication port 24. The breathable mesh 5 does not occupy the volume of the front cavity and the back cavity 100, thereby maximizing the volume of the front cavity and the back cavity 100 to reduce F0 and widen the low-frequency bandwidth.

[0057] As shown in Figures 6 and 7 , the tweeter preferably further includes a narrow air duct 101. A through hole 102 is provided on the closed-loop outer peripheral wall 4 or the second ring plate 22, connecting to the back cavity 100. One end of the narrow air duct 101 is connected to the through hole 102, while the other end is connected to the outside world. The narrow air duct 101 has a narrow tube effect, which is used to enhance the tweeter's low-frequency frequency response. Compared to only providing the through hole 102, the narrow air duct 101 can extend the connection distance between the back cavity 100 and the outside world, preventing high-frequency air leakage and wind shearing. Furthermore, the narrow air duct 101 still discharges the overheated airflow within the back cavity 100 under high power, thereby improving the product's power handling capability. This reduces the thermoviscous effect of the speaker's operating magnetic field, maximizes the magnetic field strength, and improves the purity and clarity of the sound.

[0058] Optionally, a narrow groove 103 is provided on the end surface of the second ring plate 22 facing away from the first ring plate 21 or on the outer surface of the closed-loop outer peripheral wall 4. The through hole 102 is disposed within the narrow groove 103 and is located at one end of the narrow groove 103 in the longitudinal direction. Except for the end of the narrow groove 103 that is away from the through hole 102 in the longitudinal direction, the slot closure 6 covers the slot above the rest of the narrow groove 103, thereby forming the narrow air duct 101. Compared to directly forming the narrow air duct 101 in the second ring plate 22 or the closed-loop outer peripheral wall 4, forming the narrow air duct 101 by designing the narrow groove 103 and sealing it with the slot closure 6 can significantly reduce the difficulty of the processing and reduce manufacturing costs. This effect is particularly evident in small tweeters.

[0059] Optionally, the slot closure member 6 is a sealing patch attached to the second ring plate 22 or the closed-ring outer peripheral wall 4. Specifically, when the elongated groove 103 is located on the second ring plate 22, the sealing patch is attached to the end surface of the second ring plate 22 facing away from the first ring plate 21. When the elongated groove 103 is located on the closed-ring outer peripheral wall 4, the sealing patch is attached to the outer surface of the closed-ring outer peripheral wall 4. The installation of the sealing patch barely increases the size of the speaker, and the attachment process is mature and low-cost.

[0060] The sealing patch can be made of a polymer material that is lightweight, has good sealing properties, and is easy to apply. Specifically, the sealing patch can be made of polycarbonate, polyamide, acrylonitrile-butadiene-styrene copolymer, polystyrene, polypropylene, polyvinyl chloride, polyurethane, polyethylene, phenolic resin, or the like. In this embodiment, the sealing patch is made of polyethylene terephthalate, which has excellent physical and mechanical properties over a wide temperature range, including excellent creep resistance, fatigue resistance, friction resistance, and dimensional stability.

[0061] Figure 8 shows the frequency response curve of the speaker in this embodiment in which the breathable mesh is attached to the first ring plate, which is represented by a solid line. Figure 8 also shows the frequency response curve of the speaker in the technical solution proposed in the background technology (i.e., setting the sound-absorbing cotton block in the back cavity) under the same conditions, which is represented by a dotted line. Compared with the solution proposed in the background technology, it is obvious that the technical solution of this embodiment reduces the resonance frequency F0 and increases the effective low-frequency bandwidth.

Claims

1. A tweeter, comprising: U-shaped magnet assembly (1); a closed ring frame (2) surrounding the outer periphery of the U-shaped magnet assembly (1); the cross section of the closed ring frame (2) along its circumference is a U-shaped cross section, and the bottom of the U-shaped cross section is closer to the U-shaped magnet assembly (1) than the top thereof; A vibration assembly (3), comprising a suspension member (31) and a diaphragm (32), wherein the suspension member (31) is connected to the periphery of the diaphragm (32), the diaphragm (32) is connected to the closed-loop frame (2) via the suspension member (31), and the diaphragm (32), the suspension member (31), the closed-loop frame (2) and the U-shaped magnet assembly (1) are arranged to form a front cavity; a closed-loop outer peripheral wall (4) surrounding the outer periphery of the closed-loop frame (2), the closed-loop outer peripheral wall (4) sealing the top of the U-shaped cross-section of the closed-loop frame (2), thereby forming a back cavity (100) between the closed-loop outer peripheral wall (4) and the closed-loop frame (2), the closed-loop frame (2) being provided with a communication port (24) connecting the front cavity and the back cavity (100), the front cavity and the back cavity (100) and the communication port (24) forming a Helmholtz resonator system; A breathable mesh (5) is provided at the communication opening (24).

2. The tweeter according to claim 1, wherein The closed ring frame (2) comprises a first ring plate (21), a second ring plate (22) and a closed ring inner peripheral wall (23); the first ring plate (21) and the second ring plate (22) are spaced apart; the closed ring inner peripheral wall (23) is connected to the inner ring of the first ring plate (21) and the inner ring of the second ring plate (22); the first ring plate (21), the second ring plate (22) and the closed ring inner peripheral wall (23) together form the U-shaped cross section; the closed ring inner peripheral wall (23) surrounds the outer periphery of the U-shaped magnet assembly (1); the closed ring outer peripheral wall (4) surrounds the outer ring of the first ring plate (21) and the outer ring of the second ring plate (22), the back cavity (100) is formed between the closed-loop outer peripheral wall (4), the first ring plate (21), the second ring plate (22) and the closed-loop inner peripheral wall (23), the suspension member (31) is connected to the first ring plate (21), the diaphragm (32), the suspension member (31), the first ring plate (21) and the U-shaped magnet assembly (1) are formed to form the front cavity, and the connecting port (24) is opened on the first ring plate (21).

3. The tweeter according to claim 2, wherein: At least two communication openings (24) are provided, and all the communication openings (24) are evenly distributed along the circumference of the first ring plate (21). The number of the air-permeable meshes (5) and the communication openings (24) is consistent and one-to-one corresponding, and the air-permeable meshes (5) are arranged at the corresponding communication openings (24).

4. The tweeter according to claim 2, wherein: The breathable mesh (5) is located in the front cavity and is attached to the first ring plate (21).

5. The tweeter according to claim 2, wherein The breathable mesh (5) is embedded in the communication opening (24).

6. The tweeter according to claim 2 further comprises a narrow air duct (101), a through hole (102) communicating with the back cavity (100) is provided on the closed-ring outer peripheral wall (4) or the second ring plate (22), one end of the narrow air duct (101) is connected to the through hole (102), and the other end is connected to the outside.

7. The tweeter according to claim 6, wherein: A narrow groove (103) is provided on the end surface of the second ring plate (22) facing away from the first ring plate (21) or on the outer side surface of the closed-ring outer peripheral wall (4); the through hole (102) is arranged in the narrow groove (103) and is located at one end of the narrow groove (103) in the length direction; except for the end of the narrow groove (103) away from the through hole (102) in the length direction, the slot closing member (6) covers the slot of the rest of the narrow groove (103) to form the narrow air duct (101).

8. The tweeter according to claim 7, wherein The slot closing piece (6) is a closing patch, and the closing patch is attached to the second ring plate (22) or the closed ring outer peripheral wall (4).

9. The tweeter according to claim 8, wherein The sealing patch is a polyethylene terephthalate sheet.

10. The tweeter according to any one of claims 1 to 9, wherein: The diaphragm (32) is in a dome shape.

Images