Bone conduction TWS earphone with waterproof function

Abstract

The application provides a bone conduction TWS earphone with a waterproof function, which comprises a U-shaped back hanging line, a first earphone shell and a second earphone shell, one end of the U-shaped back hanging line is connected with the first earphone shell, the other end is connected with the second earphone shell, the first earphone shell and the second earphone shell are both provided with an ear hook at the end away from the U-shaped back hanging line, one end of the ear hook is provided with a sound generating mechanism, the bottom of the first earphone shell is provided with a first earphone inner shell, the first earphone inner shell is internally provided with a waterproof key chip assembly, the waterproof key chip comprises a circuit board, the circuit board is located below the first earphone shell, the bottom of the second earphone shell is provided with a second earphone inner shell, the inside of the second earphone inner shell is provided with a waterproof power supply assembly, and the joint of the first earphone shell and the first earphone inner shell is provided with a waterproof adhesive layer; the waterproof performance is improved through the combination of the waterproof adhesive layer and the sealing ring; the circuit board and the adjusting key can be protected from water through the waterproof key chip assembly.

Description

Technical Field

[0001] This invention belongs to the field of bone conduction headphone technology, and more specifically, relates to a waterproof bone conduction TWS headphone. Background Technology

[0002] With the fast pace of life and the increasing popularity of outdoor sports, the demand for portable wearable smart devices is growing. Bone conduction technology is enabling headphones to become smaller and more comfortable. However, due to their compact structure, existing bone conduction headphones have poor waterproof performance and are easily damaged by sweat and rain during use.

[0003] For example, Chinese utility model patent No. 201921524788.0 provides a new type of waterproof bone conduction Bluetooth headset. This bone conduction headset uses an interface sealing ring and a sealing sleeve. During use, the interface sealing ring between the outer and inner earphone shells can fill the gap at the interface, preventing water from entering from the connection of the shell. By wrapping the speaker in the sealing sleeve, water is prevented from entering the inside of the headset through the speaker, thus achieving a waterproof function and having a certain waterproof effect.

[0004] However, bone conduction TWS earphones similar to those mentioned above currently have the following shortcomings: firstly, the waterproofing method is limited to a single sealing ring; secondly, the earphone button area is not waterproofed, reducing its versatility. Therefore, in view of these issues, this paper researches and improves upon the existing structure and its deficiencies to provide a waterproof bone conduction TWS earphone, aiming to achieve greater practical value. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a waterproof bone conduction TWS earphone, which solves the problems in the prior art where the waterproofing method is singular, relying solely on a sealing ring for protection, resulting in insufficient waterproofing performance, and where the earphone button area is not waterproofed, thus reducing its versatility.

[0006] The purpose and effect of the waterproof bone conduction TWS earphone of the present invention are achieved by the following specific technical means:

[0007] A waterproof bone conduction TWS earphone includes a U-shaped back hook, a first earphone shell, and a second earphone shell. One end of the U-shaped back hook is connected to the first earphone shell, and the other end is connected to the second earphone shell. Both the first and second earphone shells have ear hooks at their ends away from the U-shaped back hook. One end of each ear hook has a sound-generating mechanism. A first earphone inner shell is located at the bottom of the first earphone shell, and a waterproof button chip assembly is located inside the first earphone inner shell. The waterproof button chip includes a circuit board located below the first earphone shell. A second earphone inner shell is located at the bottom of the second earphone shell, and a waterproof power supply assembly is located inside the second earphone inner shell. A waterproof adhesive layer is provided at the joint between the first earphone shell and the first earphone inner shell.

[0008] As a further embodiment of the present invention, the sound-generating mechanism includes a sound-generating unit bracket, one end of the ear hook is provided with the sound-generating unit bracket, the sound-generating unit bracket is provided with a mounting hole, and a waterproof sound-generating unit assembly is provided in the mounting hole.

[0009] As a further embodiment of the present invention, the waterproof sound-generating unit assembly includes a mounting plate, and a plurality of connecting posts are provided in the mounting hole on the side near the mounting plate. The mounting plate is fastened to the plurality of connecting posts, and a waterproof adhesive layer is provided at the fastening point between the mounting plate and the mounting hole.

[0010] As a further embodiment of the present invention, a mounting base is provided on one side of the mounting plate, a sound-generating diaphragm is provided in the mounting hole, a through hole is provided on the sound-generating diaphragm, one end of the sound-generating oscillator passes through the through hole and is inserted into the mounting base, and the sound-generating oscillator is connected to the circuit board through a wire.

[0011] As a further embodiment of the present invention, a bone conduction vibrator is fitted onto the side of the mounting hole away from the mounting plate, a first sealing ring is provided between the bone conduction vibrator and the mounting hole, the other end of the sound-emitting vibrator is in contact with the bone conduction vibrator, and a fitting piece is provided on the side of the bone conduction vibrator away from the sound-emitting vibrator. The first sealing ring is made of silicone.

[0012] As a further embodiment of the present invention, the waterproof button chip assembly further includes a waterproof sleeve. The waterproof sleeve is disposed on the outer surface of the circuit board. The waterproof sleeve is fixedly connected inside the inner shell of the first earphone. Two sets of adjustment buttons are disposed at the bottom of the circuit board. Two sets of through holes are disposed at the bottom of the inner shell of the first earphone. The two sets of adjustment buttons are respectively inserted into the two sets of through holes. An elastic waterproof sleeve is disposed on the outer surface of each set of adjustment buttons. The two sets of elastic waterproof sleeves are fixedly connected to the two sets of through holes. Both sets of elastic waterproof sleeves are made of rubber.

[0013] As a further embodiment of the present invention, the waterproof power assembly includes a waterproof battery, the waterproof battery is fixedly connected inside the second earphone inner shell, a second sealing ring is provided at the joint between the second earphone outer shell and the second earphone inner shell, the second sealing ring is made of silicone, a charging connector is also provided at the bottom of the circuit board, a square through hole is provided at the bottom of the first earphone inner shell corresponding to the charging connector, and a waterproof cover is provided on the square through hole.

[0014] As a further embodiment of the present invention, the waterproof power supply assembly further includes a connecting wire, and a connecting through hole is provided on the U-shaped rear hanging wire. The connecting wire passes through the connecting through hole, one end of the connecting wire is connected to the circuit board, and the other end is connected to the waterproof battery.

[0015] As a further embodiment of the present invention, a first sealing connecting sleeve is provided at one end of the U-shaped rear hanging cable, and the U-shaped rear hanging cable is connected to the first earphone inner shell and the first earphone outer shell through the first sealing connecting sleeve. A second sealing connecting sleeve is provided at the other end of the U-shaped rear hanging cable, and the second earphone outer shell and the second earphone inner shell are fitted with the second sealing connecting sleeve. Both the first sealing connecting sleeve and the second sealing connecting sleeve are made of rubber, and a reset steel wire is also provided in the connecting through hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. By incorporating a waterproof button chip component, the waterproof and elastic waterproof sleeves effectively prevent moisture and humidity from seeping into the headphones, protecting the circuit board and adjustment buttons from water damage. This solves the problem of insufficient waterproofing at the buttons in traditional bone conduction headphones. As a result, even when used in humid environments, such as during exercise or in the rain, the performance and lifespan of the headphones can be effectively protected.

[0018] 2. By setting sealing layers and sealing rings at multiple connection points, the headphone shell is fully waterproofed, reliably preventing liquid from seeping into the body through seams and openings. This ensures waterproof performance during long-term exercise or outdoor use, solves the problem of the single waterproofing method of traditional bone conduction headphones, and improves the safety and reliability of the product.

[0019] 3. The waterproof power assembly ensures the bone conduction headphones function properly even in water or humid environments. The silicone material of the second sealing ring effectively prevents moisture from seeping into the headphones, protecting the battery and circuit board. Furthermore, the waterproof cover on the charging connector and square through-hole at the bottom of the headphones prevents water from entering the charging port, further enhancing the headphones' water resistance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the assembled structure of a waterproof bone conduction TWS earphone according to the present invention;

[0021] Figure 2 This is a schematic diagram of the unfolded structure of a waterproof bone conduction TWS earphone according to the present invention;

[0022] Figure 3 This is a schematic diagram of the unfolded structure of some parts of a waterproof bone conduction TWS earphone according to the present invention;

[0023] Figure 4 This is a schematic diagram of the assembled structure of the sound-generating mechanism and the waterproof sound-generating unit assembly in a waterproof bone conduction TWS earphone according to the present invention.

[0024] Figure 5 This is a schematic diagram of the disassembled sound-generating mechanism and waterproof sound-generating unit assembly in a waterproof bone conduction TWS earphone according to the present invention.

[0025] Figure 6 This is a schematic diagram of the assembled structure of the waterproof button chip assembly in a bone conduction TWS earphone with waterproof function according to the present invention.

[0026] Figure 7 yes Figure 6 A schematic diagram of the disassembled structure;

[0027] Figure 8 This is a schematic diagram of the assembled structure of the waterproof power supply component in a waterproof bone conduction TWS earphone according to the present invention.

[0028] Figure 9 yes Figure 8 A schematic diagram of the disassembled structure.

[0029] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0030] 101. U-shaped rear hanging cable; 102. First earphone shell; 103. Second earphone shell; 104. Ear hook; 105. First earphone inner shell; 106. Second earphone inner shell; 107. Connecting through hole; 108. First sealing connecting sleeve; 109. Second sealing connecting sleeve; 110. Reset steel wire; 201. Sound unit bracket; 202. Mounting hole; 203. Mounting plate; 204. Mounting base; 205. Sound diaphragm; 206. Sound oscillator; 207. Bone conduction oscillator; 208. First sealing ring; 209. Adhesive piece; 301. Circuit board; 302. Waterproof sleeve; 303. Adjustment button; 304. Elastic waterproof sleeve; 401. Waterproof battery; 402. Second sealing ring; 403. Charging connector; 404. Waterproof cover; 405. Connecting wire. Detailed Implementation

[0031] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present invention, but should not be used to limit the scope of protection of the present invention.

[0032] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] Example:

[0034] like Figures 1 to 3As shown, this invention provides a waterproof bone conduction TWS earphone, including a U-shaped back hook 101, a first earphone shell 102, and a second earphone shell 103. One end of the U-shaped back hook 101 is connected to the first earphone shell 102, and the other end is connected to the second earphone shell 103. To increase wearing stability, ear hooks 104 are provided at the ends of both the first and second earphone shells 102 and 103 away from the U-shaped back hook 101. One end of the ear hook 104 also has a sound-generating mechanism to ensure clear sound quality and appropriate volume. To achieve waterproofing, a first earphone inner shell 105 is provided at the bottom of the first earphone shell 102. A waterproof button chip assembly, including a circuit board 301, is installed inside the first earphone inner shell 105. The circuit board 301 is located below the first earphone shell 102, effectively preventing moisture from seeping into the earphone and protecting the normal operation of the circuit. Additionally, a second earphone inner shell 106 is provided at the bottom of the second earphone shell 103. A waterproof power supply assembly is installed inside the second earphone inner shell 106 to ensure power safety and stability. With this design, users don't need to worry about the headphones being damaged by moisture, even when used in humid environments. To further enhance waterproof performance, a waterproof adhesive layer is provided at the joint between the first headphone shell 102 and the first headphone inner shell 105, which can prevent liquid from entering the interior of the bone conduction headphones and protect the internal components.

[0035] Please refer to, for example Figure 2 , Figure 3 and Figure 4 As shown, the sound-generating mechanism is a crucial component of bone conduction TWS earphones. It includes a sound-generating unit bracket 201. To ensure the stability and reliability of the sound-generating unit, one end of the ear hook 104 is equipped with the sound-generating unit bracket 201. The sound-generating unit bracket 201 has a robust structure that effectively supports and protects the sound-generating unit, maintaining its stability and reliability, and ensuring clear sound quality and appropriate volume. Mounting holes 202 are provided on the sound-generating unit bracket 201 for mounting waterproof sound-generating unit components. These mounting holes 202 also make replacing and repairing the sound-generating unit more convenient and quick. Furthermore, mounting waterproof sound-generating unit components enhances the earphone's waterproof performance, protecting the sound-generating unit from water damage, improving product safety and reliability, and providing users with clear sound quality and a reliable user experience.

[0036] Please refer to, for example Figure 3 and Figure 4As shown, the waterproof sound-generating unit assembly is used to produce clear sound and is waterproof. The waterproof sound-generating unit assembly includes a mounting plate 203. Multiple sets of connecting posts are provided on one side of the mounting plate 203 within the mounting hole 202. These connecting posts are fastened to the mounting plate 203, ensuring the stability and reliability of the mounting plate 203. Simultaneously, a waterproof adhesive layer is provided at the fastening point between the mounting plate 203 and the mounting hole 202 to prevent moisture from penetrating into the interior of the sound-generating unit assembly. A mounting base 204 is provided on one side of the mounting plate 203 for fixing the sound-generating vibrator 206. A sound-generating diaphragm 205 is installed within the mounting hole 202, and the sound-generating diaphragm 205 has a through hole. One end of the sound-generating vibrator 206 passes through this through hole and is housed within the mounting base 204, ensuring the stability of the sound-generating vibrator 206. The sound-generating oscillator 206 is connected to the circuit board 301 via wires to transmit electrical signals, enabling the waterproof sound-generating unit assembly to maintain stable and effective sound generation under the protection of the waterproof adhesive layer, providing reliable waterproof performance.

[0037] Please refer to, for example Figure 3 and Figure 4 As shown, in the waterproof sound unit assembly of the bone conduction TWS earphones, a bone conduction vibrator 207 is mounted on the side of the mounting hole 202 away from the mounting plate 203. To ensure waterproof performance, a first sealing ring 208 is provided between the bone conduction vibrator 207 and the mounting hole 202. The first sealing ring 208 is made of silicone material, which can effectively prevent moisture from entering the sound unit assembly. One end of the sound-generating vibrator 206 contacts the bone conduction vibrator 207 to transmit sound signals. A fitting piece 209 is provided on the side of the bone conduction vibrator 207 away from the sound-generating vibrator 206. The fitting piece 209 allows the bone conduction earphones to fit more comfortably against the user's face, increasing comfort, improving the clarity and stability of sound quality, and providing a high-quality music and call experience.

[0038] Please refer to, for example Figure 2 , Figure 6 and Figure 7 As shown, the waterproof button chip assembly of the present invention also includes a waterproof sleeve 302. The waterproof sleeve 302 is disposed on the outer surface of the circuit board 301, and is fixedly connected inside the first earphone inner shell 105. Two sets of adjustment buttons 303 are disposed at the bottom of the circuit board 301, and two sets of through holes are disposed at the bottom of the first earphone inner shell 105. The two sets of adjustment buttons 303 are respectively inserted into the two sets of through holes. To ensure waterproof performance, elastic waterproof sleeves 304 are disposed on the outer surface of both sets of adjustment buttons 303, increasing the sealing between the two sets of adjustment buttons 303 and the internal space, thus improving waterproof performance. Both sets of elastic waterproof sleeves 304 are made of rubber. The two sets of elastic waterproof sleeves 304 are fixedly connected to the two sets of through holes to ensure the waterproof performance between the buttons and the internal space.

[0039] Please refer to, for example Figure 7 , Figure 8 and Figure 9 As shown, the waterproof power assembly includes a waterproof battery 401, which is fixedly connected inside the second earphone inner shell 106 to protect it from moisture. To improve waterproof performance, a second sealing ring 402 is provided at the joint between the second earphone outer shell 103 and the second earphone inner shell 106. This second sealing ring 402 is made of silicone, which has good waterproof performance and can effectively prevent water from seeping into the earphone. A charging connector 403 is also provided at the bottom of the circuit board 301 for user use during charging. To protect the charging connector 403 from moisture, a square through hole is provided at the bottom of the first earphone inner shell 105 corresponding to the position of the charging connector 403, and a waterproof cover 404 is provided on the square through hole. The waterproof cover 404 can effectively prevent water from entering the square through hole and protect the charging connector 403.

[0040] Please refer to, for example Figure 3 , Figure 7 and Figure 9 As shown, in addition to the components mentioned above, the waterproof power assembly also includes a connecting wire 405. The connecting wire 405 connects the circuit board 301 and the waterproof battery 401, ensuring the battery can supply power normally. A connection through-hole 107 is provided on the U-shaped rear hanging cable 101, and the connecting wire 405 passes through the connection through-hole 107 to effectively hide the connecting wire 405, making the overall appearance cleaner. One end of the connecting wire 405 is connected to the circuit board 301, and the other end is connected to the waterproof battery 401. Through this connection method, the circuit board 301 can obtain the necessary power from the waterproof battery 401 to ensure the headphones function normally.

[0041] Please refer to, for example Figure 2 and Figure 3 As shown, one end of the U-shaped back hook 101 is provided with a first sealing connecting sleeve 108. Through the first sealing connecting sleeve 108, the U-shaped back hook 101 can be connected to the first earphone inner shell 105 and the first earphone outer shell 102 to form a tight connection. On the other hand, the other end of the U-shaped back hook 101 is provided with a second sealing connecting sleeve 109. The second sealing connecting sleeve 109 is engaged with one end of the second earphone outer shell 103 and the second earphone inner shell 106. This ensures that the overall structure of the earphone is tight and effectively prevents moisture from seeping in. Both the first sealing connecting sleeve 108 and the second sealing connecting sleeve 109 are made of rubber, which has good sealing performance and water resistance. They can effectively prevent moisture from seeping into the earphone and protect the internal components of the earphone from moisture damage. In addition, a reset steel wire 110 is provided in the connecting through hole 107, which makes the U-shaped back hook 101 have a certain degree of elasticity, so that the bone conduction earphone can fit the user and provide support, expanding its application range.

[0042] The specific usage and function of this embodiment are as follows: When using this bone conduction TWS earphone, the user can connect one end of the U-shaped rear hook cable 101 to the first earphone shell 102 and the other end to the second earphone shell 103. An ear hook 104 is placed at the end of the first and second earphone shells 102 away from the U-shaped rear hook cable 101 to increase wearing stability. A reset steel wire 110 is also provided in the connection through hole 107 on the U-shaped rear hook cable 101. The reset steel wire 110 makes the bone conduction TWS earphone more suitable for the user's wearing, improving the user experience. Furthermore, to ensure the earphone's airtightness, the first earphone shell 102, the second earphone shell 103, and the ear hook 104 and the speaker unit bracket 201 on one side are all integrally injection molded, providing a good sealing effect. A sound-generating mechanism is provided at one end of the ear hook 104, ensuring clear sound quality and appropriate volume. Simultaneously, a waterproof button chip assembly allows for volume adjustment, further enhancing the user experience.

[0043] When using these bone conduction TWS earphones, to protect the circuit board 301 and adjustment buttons 303 from water damage, the waterproof sleeve 302 and elastic waterproof sleeve 304 effectively prevent moisture and humidity from seeping into the earphone, solving the problem of insufficient waterproof performance at the buttons in traditional bone conduction earphones. Furthermore, the sealing layer, the first sealing ring 208, and the second sealing ring 402 at multiple connection points achieve all-around waterproof sealing of the earphone shell, reliably preventing liquid from seeping into the body through seams and openings, ensuring waterproof performance during prolonged exercise or outdoor use. This comprehensive waterproof design solves the problem of the single waterproofing method in traditional bone conduction earphones, improving the product's safety and reliability.

[0044] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments.

Claims

1. A waterproof bone conduction TWS earphone, comprising a U-shaped back hook cable (101), a first earphone shell (102), and a second earphone shell (103), characterized in that: One end of the U-shaped back hook (101) is connected to the first earphone shell (102), and the other end is connected to the second earphone shell (103). Both the first earphone shell (102) and the second earphone shell (103) have ear hooks (104) at the ends away from the U-shaped back hook (101). One end of each ear hook (104) has a sound-generating mechanism. A first earphone inner shell (105) is located at the bottom of the first earphone shell (102). A waterproof button chip assembly is located inside the first earphone inner shell (105). The device includes a circuit board (301) located below the first earphone shell (102). A second earphone inner shell (106) is disposed at the bottom of the second earphone shell (103). A waterproof power supply assembly is disposed inside the second earphone inner shell (106). A waterproof adhesive layer is disposed at the joint between the first earphone shell (102) and the first earphone inner shell (105). The waterproof button chip assembly also includes a waterproof sleeve (302), which is disposed on the outer surface of the circuit board (301). The waterproof sleeve (302) is fixedly connected inside the earphone inner shell (105). Two sets of adjustment buttons (303) are provided at the bottom of the circuit board (301). Two sets of through holes are provided at the bottom of the first earphone inner shell (105). The two sets of adjustment buttons (303) are respectively inserted into the two sets of through holes. The outer surface of the two sets of adjustment buttons (303) is provided with elastic waterproof sleeves (304). The two sets of elastic waterproof sleeves (304) are respectively fixedly connected to the two sets of through holes. The two sets of elastic waterproof sleeves (304) are made of rubber. The waterproof power supply unit The device includes a waterproof battery (401), the waterproof battery (401) is fixedly connected inside the second earphone inner shell (106), a second sealing ring (402) is provided at the joint between the second earphone outer shell (103) and the second earphone inner shell (106), the second sealing ring (402) is made of silicone, a charging connector (403) is also provided at the bottom of the circuit board (301), a square through hole is opened at the bottom of the first earphone inner shell (105) corresponding to the charging connector (403), and a waterproof cover (404) is provided on the square through hole.

2. The waterproof bone conduction TWS earphone according to claim 1, characterized in that: The sound-generating mechanism includes a sound-generating unit bracket (201), and the sound-generating unit bracket (201) is provided at one end of the ear hook (104). The sound-generating unit bracket (201) has an installation hole (202), and a waterproof sound-generating unit assembly is provided in the installation hole (202).

3. A waterproof bone conduction TWS earphone according to claim 2, characterized in that: The waterproof sound-generating unit assembly includes a mounting plate (203). Multiple sets of connecting posts are provided in the mounting hole (202) near the side of the mounting plate (203). The mounting plate (203) is fastened to the multiple sets of connecting posts. A waterproof adhesive layer is provided at the fastening point between the mounting plate (203) and the mounting hole (202).

4. A waterproof bone conduction TWS earphone according to claim 3, characterized in that: A mounting base (204) is provided on one side of the mounting plate (203). A sound-emitting diaphragm (205) is provided in the mounting hole (202). A through hole is provided on the sound-emitting diaphragm (205). One end of the sound-emitting vibrator (206) passes through the through hole and is installed in the mounting base (204). The sound-emitting vibrator (206) is connected to the circuit board (301) through a wire.

5. A waterproof bone conduction TWS earphone according to claim 4, characterized in that: A bone conduction vibrator (207) is fitted onto the side of the mounting hole (202) away from the mounting plate (203). A first sealing ring (208) is provided between the bone conduction vibrator (207) and the mounting hole (202). The other end of the sound-emitting vibrator (206) is in contact with the bone conduction vibrator (207). A fitting piece (209) is provided on the side of the bone conduction vibrator (207) away from the sound-emitting vibrator (206). The first sealing ring (208) is made of silicone.

6. A waterproof bone conduction TWS earphone according to claim 5, characterized in that: The waterproof power assembly also includes a connecting wire (405). The U-shaped rear hanging wire (101) has a connecting through hole (107). The connecting wire (405) passes through the connecting through hole (107). One end of the connecting wire (405) is connected to the circuit board (301), and the other end is connected to the waterproof battery (401).

7. A waterproof bone conduction TWS earphone according to claim 6, characterized in that: One end of the U-shaped back cable (101) is provided with a first sealing connecting sleeve (108). The U-shaped back cable (101) is connected to the first earphone inner shell (105) and the first earphone outer shell (102) through the first sealing connecting sleeve (108). The other end of the U-shaped back cable (101) is provided with a second sealing connecting sleeve (109). The second earphone outer shell (103) and the second earphone inner shell (106) are fitted with the second sealing connecting sleeve (109). The first sealing connecting sleeve (108) and the second sealing connecting sleeve (109) are both made of rubber. A reset steel wire (110) is also provided in the connecting through hole (107).

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