Coaxial loudspeaker and sound production equipment

Abstract

The invention relates to the technical field of acoustics, in particular to a coaxial loudspeaker and sound production equipment, the coaxial loudspeaker comprises a bass sound production unit, a treble sound production unit and a sealing vibrating diaphragm which are coaxially arranged, the sealing vibrating diaphragm comprises a treble inner vibrating diaphragm, a circumferential sealing part and a bass outer vibrating diaphragm, the circumferential sealing part is positioned between the high-pitch inner vibrating diaphragm and the low-pitch outer vibrating diaphragm; a low-pitch voice coil of the low-pitch sounding unit is bonded with the circumferential sealing part, and a high-pitch voice coil of the high-pitch sounding unit is bonded with the high-pitch inner vibrating diaphragm.

Description

Technical Field

[0001] The present invention relates to the field of acoustic technology, and in particular to a coaxial loudspeaker and a sound-generating device. Background Art

[0002] A coaxial speaker is a speaker that integrates a tweeter unit and a woofer unit, and the tweeter unit and the woofer unit are coaxially arranged. The point sound sources of the tweeter unit and the woofer unit of the coaxial speaker are both located on the front of the speaker, which refers to the surface where the bass diaphragm of the woofer unit and the tweeter diaphragm of the tweeter unit are located.

[0003] In the related art, all or part of the woofer unit is arranged around the tweeter unit, wherein the front of the coaxial speaker includes a tweeter drum paper and a bass drum paper, the treble voice coil of the tweeter unit is connected to the tweeter drum paper, and the bass voice coil of the woofer unit is connected to the bass drum paper, forming a gap between the tweeter drum paper and the bass drum paper. When the woofer unit vibrates, part of the airflow flows out from the gap, resulting in airflow loss, reducing the low-frequency effect, and failing to achieve airtight and waterproof. Summary of the invention

[0004] The main purpose of the present invention is to provide a coaxial loudspeaker, which aims to seal the diaphragm by sealing and covering the bass sound unit and the tweeter sound unit to play a sealing role.

[0005] The present invention proposes a coaxial loudspeaker, which includes a coaxially arranged bass sound unit, a tweeter sound unit and a sealed diaphragm, wherein the sealed diaphragm includes a tweeter inner diaphragm, a circumferential sealing portion and a bass outer diaphragm, wherein the circumferential sealing portion is located between the tweeter inner diaphragm and the bass outer diaphragm; the bass voice coil of the bass sound unit is bonded to the circumferential sealing portion, and the tweeter voice coil of the tweeter sound unit is bonded to the tweeter inner diaphragm.

[0006] The present invention proposes a sound-generating device, comprising the coaxial loudspeaker, wherein the tweeter inner diaphragm and the bass outer diaphragm are spaced apart to form a circumferential sealing portion of an annular gap, and the bass voice coil is inserted into the circumferential sealing portion; the outer diameter of the bass voice coil is bonded to the inner diameter of the bass outer diaphragm, and the inner diameter of the bass voice coil is bonded to the outer diameter of the tweeter inner diaphragm.

[0007] The present invention proposes a sound-generating device, comprising the coaxial loudspeaker, wherein the tweeter inner diaphragm, the circumferential sealing portion and the bass outer diaphragm are an integrated structure, the circumferential sealing portion is an annular groove adapted to the bass voice coil, the outer ends of the annular groove are respectively connected to the outer diameter of the tweeter inner diaphragm and the inner diameter of the bass outer diaphragm; a positioning step is formed on the side of the annular groove facing the bass voice coil, and the inner diameter of the bass voice coil is bonded to the outer diameter of the positioning step. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0009] Figure 1 A schematic structural diagram of an embodiment of a coaxial loudspeaker provided by the present invention;

[0010] Figure 2 for Figure 1 Schematic diagram of structural explosion;

[0011] Figure 3 For along Figure 1 Sectional view along line AA;

[0012] Figure 4 A schematic structural diagram of another embodiment of the coaxial loudspeaker provided by the present invention;

[0013] Figure 5 for Figure 4 Schematic diagram of structural explosion;

[0014] Figure 6 For along Figure 4 Sectional view along the midline BB;

[0015] Figure 7 for Figure 6 Enlarged view of point C in the middle.

[0016] Description of Figure Numbers:

[0017] 10. Bass sound unit; 11. Bass magnetic circuit system; 11a. Bass magnetic circuit gap; 111. Bass U iron; 112. Hollow bass magnet; 113. Hollow bass washer; 12. Bass voice coil; 13. Elbow; 14. Basin; 20. Treble sound unit; 21. Treble magnetic circuit system; 21a. Treble magnetic circuit gap; 211. Treble U iron; 212. Solid treble magnet; 213. Solid treble washer; 22. Treble voice coil; 30. Sealed diaphragm; 31. Bass outer diaphragm; 30a. Circumferential sealing part; 32. Treble inner diaphragm; 33. Positioning step; 40. Treble bracket; 41. Fixed end; 42. Load-bearing end; 43. Wiring terminal.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] The present invention provides a coaxial loudspeaker, see Figure 1 , Figure 2 , Figure 4 as well as Figure 5, including a coaxially arranged woofer sound unit 10, a tweeter sound unit 20 and a sealed diaphragm 30, the sealed diaphragm 30 including a tweeter inner diaphragm 32, a circumferential sealing portion 30a and a woofer outer diaphragm 31, the circumferential sealing portion 30a being located between the tweeter inner diaphragm 32 and the woofer outer diaphragm 31; the woofer voice coil 12 of the woofer sound unit 10 is bonded to the circumferential sealing portion 30a, and the tweeter voice coil 22 of the tweeter sound unit 20 is bonded to the tweeter inner diaphragm 32.

[0023] In the present technical solution, the sealing diaphragm 30 covers the bass sound unit 10 and the tweeter sound unit 20, thereby sealing the gap between the bass sound unit 10 and the tweeter sound unit 20, preventing the bass sound unit 10 from losing airflow when vibrating, thereby ensuring the low-frequency effect and achieving airtightness and waterproofness.

[0024] The sealed diaphragm 30 includes a tweeter inner diaphragm 32, a circumferential sealing portion 30a and a bass outer diaphragm 31. The tweeter inner diaphragm 32 is located in the central area of ​​the sealed diaphragm 30. The center of the tweeter inner diaphragm 32 is the center of the sealed diaphragm 30. The tweeter inner diaphragm 32 is connected to the tweeter sound unit 20 to achieve high-frequency sound effects. The bass outer diaphragm 31 is located in the edge area of ​​the sealed diaphragm 30. The tweeter inner diaphragm 32 is arranged around the tweeter inner diaphragm 32. The bass outer diaphragm 31 is connected to the bass sound unit 10 to achieve low-frequency sound effects. There is a circumferential sealing portion 30a between the tweeter inner diaphragm 32 and the bass outer diaphragm 31 as a transition. The circumferential sealing portion 30a of the transition part is connected to the tweeter inner diaphragm 32 and the bass outer diaphragm 31 to achieve low-frequency sealed vibration. The circumferential sealing portion 30a can be a groove structure. For example, the two ends of the circumferential sealing portion 30a of the groove structure are respectively connected to the outer diameter of the tweeter inner diaphragm 32 and the inner diameter of the bass outer diaphragm 31, so that the sealed diaphragm 30 has a sealing effect. In another embodiment, the circumferential sealing portion 30a is an annular gap surrounding the outer diameter of the tweeter inner diaphragm 32, and the bass voice coil 12 of the bass sounding unit 10 is inserted in the annular gap to make the sealing The diaphragm 30 has a sealing function; it can be understood that both the tweeter inner diaphragm 32 and the bass outer diaphragm 31 include a sound diaphragm and a drum paper. The sound diaphragm is the part of the tweeter inner diaphragm 32 and the bass outer diaphragm 31 that is directly connected to the voice coil, and the drum paper is the supporting structure of the sound diaphragm, and its function is to maintain the shape of the sound diaphragm and provide the necessary stability and strength during vibration to prevent the sound diaphragm from being excessively deformed or damaged. Specifically, in the present technical solution, the sound diaphragm of the tweeter inner diaphragm 32 is located in the central area of ​​the sealed diaphragm 30, and its outer edge is connected to the drum paper of the tweeter inner diaphragm 32. The drum paper of the tweeter inner diaphragm 32 is connected to the sound diaphragm of the bass inner diaphragm through the circumferential sealing part 30a, the outer edge of the sound diaphragm of the bass inner diaphragm is connected to the drum paper of the bass inner diaphragm, and the drum paper of the bass inner diaphragm is connected to the basin frame 14 of the axial speaker, thereby achieving an overall sealing effect. Based on this structure, when the tweeter sound unit 20 is powered on and vibrates, it can only drive the sound diaphragm of the tweeter inner diaphragm 32 to vibrate, thereby achieving high-frequency acoustic performance; when the bass sound unit 10 is powered on and vibrates, the bass sound unit 10 drives the entire sealed diaphragm 30 to vibrate, thereby achieving low-frequency acoustic performance.

[0025] In one embodiment of the present invention, see Figure 2 and Figure 3The tweeter inner diaphragm 32 and the bass outer diaphragm 31 are spaced apart to form a circumferential sealing portion 30a with an annular gap, and the bass voice coil 12 is inserted in the circumferential sealing portion 30a. Specifically, the tweeter inner diaphragm 32 and the bass outer diaphragm 31 are split structures. At this time, the circumferential sealing portion 30a is a bonding structure between the inner diameter of the tweeter inner diaphragm 32 and the outer diameter of the bass voice coil 12. When the coaxial speaker is in an assembled state, the bass voice coil 12 is inserted between the tweeter inner diaphragm 32 and the bass outer diaphragm 31, and the outer diameter of the bass voice coil 12 is bonded to the bass outer diaphragm The inner diameter of the bass voice coil 12 is bonded to the outer diameter of the tweeter inner diaphragm 32, so that the sealing effect of the sealed diaphragm 30 is achieved. At the same time, the tweeter inner diaphragm 32 and the bass outer diaphragm 31 are separately arranged, and diaphragms of different materials can be used according to the required acoustic performance to achieve frequency separation. In addition, a smaller diaphragm and a lighter voice coil can be designed for the tweeter sound unit 20 to improve the high-frequency response; and for the bass sound unit 10, a larger diaphragm and a stronger magnetic circuit can be used to produce deeper bass.

[0026] In one embodiment of the present invention, see Figures 5 to 7 The tweeter inner diaphragm 32, the circumferential sealing portion 30a and the bass outer diaphragm 31 can be integrated into an integral structure by injection molding or papermaking process. The circumferential sealing portion 30a is an annular groove adapted to the bass voice coil 12, and the outer ends of the annular groove are respectively connected to the outer diameter of the tweeter inner diaphragm 32 and the inner diameter of the bass outer diaphragm 31; a positioning step 33 is formed on the side of the annular groove facing the bass voice coil 12, and the inner diameter of the bass voice coil 12 is bonded to the outer diameter of the positioning step 33. At this time, the sealed diaphragm 30 using the integrated structure only needs to bond the bass voice coil 12 and the sealed diaphragm 30, thereby reducing the number of bonding times, and the positioning step 33 formed by the annular groove can improve the positioning accuracy between the bass voice coil 12 and the sealed diaphragm 30. It can be further known that the tweeter sound unit 20 and the bass sound unit 10 are coaxially arranged, thereby improving the positioning accuracy between the tweeter sound unit 20 and the sealed diaphragm 30; the use of the sealed diaphragm 30 with an integrated structure can also improve the overall performance and reliability of the coaxial speaker.

[0027] For further information, see Figure 3 and Figure 6 The bass sound unit 10 includes a bass magnetic circuit system 11, a bass voice coil 12 and a spring 13. One end of the bass voice coil 12 is inserted into a bass magnetic circuit gap 11a of the bass magnetic circuit system 11. The spring 13 is located in the bass voice coil 12 and adheres to the inner diameter of the bass voice coil 12. When current passes through the bass voice coil 12, the bass voice coil 12 can vibrate in the bass magnetic circuit gap 11a, thereby emitting low-frequency sound effects. The spring 13 can support the bass voice coil 12 to ensure that the bass voice coil 12 remains stable during vibration and does not come into direct contact with other parts of the bass magnetic circuit system 11, thereby avoiding friction and damage.

[0028] In one embodiment of the present invention, see Figure 3 and Figure 6 The coaxial speaker also includes a tweeter bracket 40, which is located in the woofer voice coil 12 and penetrates the elastic wave 13. The tweeter bracket 40 is bonded to the elastic wave 13. Specifically, the tweeter bracket 40 is located at the central axis of the woofer voice coil 12. In this way, the coaxiality between the tweeter sound unit 20 and the woofer sound unit 10 can be guaranteed, and the position stability between the tweeter sound unit 20 and the woofer sound unit 10 can be improved.

[0029] Specifically, the tweeter bracket 40 includes a fixed end 41 and a bearing end 42, the fixed end 41 is bonded to the bass magnetic circuit system 11, and the bearing end 42 is supported and fixed to the tweeter sound unit 20;

[0030] Among them, the side of the bearing end 42 facing away from the sealed diaphragm 30 is bonded to the elastic wave 13, and the side of the bearing end 42 facing the sealed diaphragm 30 is bonded to the sealed diaphragm 30. In this way, the fixed end 41 of the tweeter bracket 40 is connected to the bass magnetic circuit system 11 by adhesive or other fixing methods, which can provide a stable support point for the tweeter bracket 40 and ensure the correct position of the entire tweeter unit in the speaker. At the same time, the elastic wave 13 is connected to the tweeter bracket 40 while supporting the bass voice coil 12, thereby enhancing the stability of the entire structure and achieving a centering effect; and because the bearing end 42 is also bonded to the sealed diaphragm 30 (that is, the tweeter inner diaphragm 32 area), this helps to fix the tweeter inner diaphragm 32 on the tweeter bracket 40, while ensuring the sealing between the sealed diaphragm 30 and the tweeter sound unit 20.

[0031] In one embodiment of the present invention, see Figure 2 and Figure 5The bass magnetic circuit system 11 includes a bass U iron 111, a hollow bass magnet 112 and a hollow bass washer 113. The hollow bass magnet 112 and the hollow washer are stacked on the iron column of the bass U iron 111. The hollow bass magnet 112 is connected to the iron column of the bass U iron 111. In this way, a closed-loop magnetic circuit can be achieved by using the bass U iron 111 to avoid magnetic leakage problems in the bass sound unit 10, thereby reducing external interference during air transportation or use; the bearing end 42 of the tweeter bracket 40 is fixedly inserted in the hollow bass magnet 112 and the hollow washer, and the bearing end 42 is provided with a wiring terminal 43, which is inserted in the bearing end 42 and connected to the tweeter by a wire. The tweeter voice coil 22 of the sound unit 20, in this way, the wiring terminal 43 can be hidden in the woofer magnetic circuit system 11, thereby compressing the volume of the coaxial speaker and improving the installation convenience of the coaxial speaker; at the same time, the tweeter bracket 40 is provided with a wire passing groove, and the two ends of the wire passing groove are respectively located at the fixed end 41 and the load-bearing end 42, so that the wire of the tweeter sounding unit 20 can be limited in the wire passing groove to avoid contact with the woofer voice coil 12, at the same time, the wiring terminal 43 is located at the bottom of the coaxial speaker, there is no need to drill a hole at the load-bearing end 42 of the tweeter bracket 40, and there is no need to set a wire passing structure for the tweeter voice coil 22 in the basin frame 14, thereby reducing the structural complexity of the coaxial speaker.

[0032] In one embodiment of the present invention, see Figure 2 and Figure 5 The tweeter sound unit 20 includes a tweeter magnetic circuit system 21 and a tweeter voice coil 22. The tweeter magnetic circuit system 21 includes a tweeter U-iron 211, a solid tweeter magnet 212 and a solid tweeter washer 213. The tweeter U-iron 211 is connected to the load-bearing end 42. The solid tweeter magnet 212 and the solid tweeter washer 213 are stacked on the iron column of the tweeter U-iron 211. The solid tweeter magnet 212 is connected to the iron column of the tweeter U-iron 211. The tweeter voice coil 22 is movably inserted in the tweeter magnetic circuit gap 21a of the tweeter magnetic circuit system 21. In this way, the tweeter sound unit 20 can provide clear, high-fidelity high-frequency sound output, and by using a solid magnet, distortion can be reduced and the purity of the sound can be improved.

[0033] The present invention proposes a sound-generating device, which can be a car audio system or a monitoring speaker. The sound-generating device includes a coaxial speaker, wherein a tweeter inner diaphragm 32 and a bass outer diaphragm 31 are arranged at intervals to form a circumferential sealing portion 30a with an annular gap, and a bass voice coil 12 is inserted in the circumferential sealing portion 30a; the outer diameter of the bass voice coil 12 is bonded to the inner diameter of the bass outer diaphragm 31, and the inner diameter of the bass voice coil 12 is bonded to the outer diameter of the tweeter inner diaphragm 32. The specific structure of the coaxial speaker refers to the above embodiment. At the same time, the coaxial speaker includes an embodiment in which the sealed diaphragm 30 in the coaxial speaker is separately arranged. Since the sound-generating device proposed by the present invention adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0034] The present invention proposes a sound-generating device, which includes a coaxial loudspeaker, wherein a tweeter inner diaphragm 32, a circumferential sealing portion 30a and a bass outer diaphragm 31 are an integrated structure, the circumferential sealing portion 30a is an annular groove adapted to the bass voice coil 12, and the outer ends of the annular groove are respectively connected to the outer diameter of the tweeter inner diaphragm 32 and the inner diameter of the bass outer diaphragm 31; a positioning step 33 is formed on the side of the annular groove facing the bass voice coil 12, and the inner diameter of the bass voice coil 12 is bonded to the outer diameter of the positioning step 33; the specific structure of the coaxial loudspeaker refers to the above-mentioned embodiment, and at the same time, the coaxial loudspeaker includes an embodiment in which the sealed diaphragm 30 in the coaxial loudspeaker is integrally arranged. Since the sound-generating device proposed by the present invention adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0035] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A coaxial loudspeaker, characterized in that: The coaxial speaker includes a coaxially arranged bass sound unit, a tweeter sound unit and a sealed diaphragm, the sealed diaphragm includes a tweeter inner diaphragm, a circumferential sealing portion and a bass outer diaphragm, the circumferential sealing portion is located between the tweeter inner diaphragm and the bass outer diaphragm; the bass voice coil of the bass sound unit is bonded to the circumferential sealing portion, and the tweeter voice coil of the tweeter sound unit is bonded to the tweeter inner diaphragm.

2. The coaxial loudspeaker according to claim 1, characterized in that The tweeter inner diaphragm and the bass outer diaphragm are spaced apart to form a circumferential sealing portion of an annular gap, and the bass voice coil is inserted in the circumferential sealing portion; the outer diameter of the bass voice coil is bonded to the inner diameter of the bass outer diaphragm, and the inner diameter of the bass voice coil is bonded to the outer diameter of the tweeter inner diaphragm.

3. The coaxial loudspeaker according to claim 1, characterized in that The tweeter inner diaphragm, the circumferential sealing portion and the bass outer diaphragm are an integrated structure, the circumferential sealing portion is an annular groove adapted to the bass voice coil, the outer ends of the annular groove are respectively connected to the outer diameter of the tweeter inner diaphragm and the inner diameter of the bass outer diaphragm; a positioning step is formed on the side of the annular groove facing the bass voice coil, and the inner diameter of the bass voice coil is bonded to the outer diameter of the positioning step.

4. The coaxial loudspeaker according to any one of claims 1 to 3, characterized in that: The bass sound unit includes a bass magnetic circuit system, a bass voice coil and a spring wave, one end of the bass voice coil is inserted into the bass magnetic circuit gap of the bass magnetic circuit system, and the spring wave is located in the bass voice coil and adhered to the inner diameter of the bass voice coil.

5. The coaxial loudspeaker according to claim 4, characterized in that: The coaxial speaker also includes a tweeter bracket, which is located in the woofer voice coil and penetrates the elastic wave, and the tweeter bracket is bonded to the elastic wave.

6. The coaxial loudspeaker according to claim 3, characterized in that: The tweeter bracket includes a fixed end and a bearing end, the fixed end is bonded to the bass magnetic circuit system, and the bearing end is supported and fixed to the tweeter sound unit; The side of the bearing end facing away from the sealing diaphragm is bonded to the elastic wave, and the side of the bearing end facing the sealing diaphragm is bonded to the sealing diaphragm.

7. The coaxial loudspeaker according to claim 6, characterized in that The bass magnetic circuit system includes a bass U iron, a hollow bass magnet and a hollow bass washer. The hollow bass magnet and the hollow washer are stacked on the iron column of the bass U iron, and the hollow bass magnet is connected to the iron column of the bass U iron; the bearing end of the tweeter bracket is fixedly inserted in the hollow bass magnet and the hollow washer, and the bearing end is provided with a wiring terminal, which is inserted in the bearing end and connected to the tweeter coil of the tweeter sound unit by a wire.

8. The coaxial loudspeaker according to claim 7, characterized in that The tweeter sound unit includes a tweeter magnetic circuit system and a tweeter voice coil, the tweeter magnetic circuit system includes a tweeter U-iron, a solid tweeter magnet and a solid tweeter washer, the tweeter U-iron is connected to the bearing end, the solid tweeter magnet and the solid tweeter washer are stacked on the iron column of the tweeter U-iron, and the solid tweeter magnet is connected to the iron column of the tweeter U-iron; the tweeter voice coil is movably inserted in the tweeter magnetic circuit gap of the tweeter magnetic circuit system.

9. A sound-generating device, characterized in that: The sound-generating device comprises the coaxial loudspeaker as claimed in claim 1, wherein the tweeter inner diaphragm and the bass outer diaphragm are spaced apart to form a circumferential sealing portion of an annular gap, and the bass voice coil is inserted into the circumferential sealing portion; the outer diameter of the bass voice coil is bonded to the inner diameter of the bass outer diaphragm, and the inner diameter of the bass voice coil is bonded to the outer diameter of the tweeter inner diaphragm.

10. A sound-generating device, characterized in that: The sound-emitting device includes the coaxial loudspeaker as claimed in claim 1, wherein the tweeter inner diaphragm, the circumferential sealing portion and the bass outer diaphragm are an integrated structure, the circumferential sealing portion is an annular groove adapted to the bass voice coil, and the outer ends of the annular groove are respectively connected to the outer diameter of the tweeter inner diaphragm and the inner diameter of the bass outer diaphragm; a positioning step is formed on the side of the annular groove facing the bass voice coil, and the inner diameter of the bass voice coil is bonded to the outer diameter of the positioning step.

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