Open type earphone

Abstract

The invention discloses an open type earphone, which comprises a functional part, a sound production part and a connecting bridge for connecting the functional part and the sound production part, and is characterized in that the sound production part comprises a first shell, a second shell and a loudspeaker assembly. The first shell is connected with the connecting bridge; the second shell is provided with a sound outlet hole, and the second shell and the first shell are nested and rotationally connected, so that the second shell is telescopic relative to the first shell; according to the earphone, the position of the sound outlet hole can be adaptively adjusted, and the listening effect in the use process of the earphone is improved.

Description

Technical Field

[0001] This invention relates to the field of headphone technology, and in particular to an open-back headphone. Background Technology

[0002] In related technologies, open-back headphones include clip-on headphones and ear-hook headphones. Taking clip-on headphones as an example, clip-on headphones are fixed to the user's ear by clamping onto the auricle. The sound-producing component of clip-on headphones does not extend into the ear canal. Furthermore, the sound output of clip-on headphones is usually fixed. This results in different distances between the sound output and the ear canal opening for different users. Especially for users with larger ears, the greater distance between the sound-producing component and the ear canal opening can easily lead to insufficient sound volume reaching the ear canal, resulting in a poor listening experience. Summary of the Invention

[0003] This application provides an open-back headphone that can adaptively adjust the position between the sound outlet and the ear canal opening to improve the listening experience.

[0004] This application provides an open-back headphone, including a functional component, a sound-emitting component, and a connecting bridge connecting the functional component and the sound-emitting component. The sound-emitting component includes a first housing, a second housing, and a speaker assembly. The first housing is connected to the connecting bridge. The second housing has a sound outlet. The second housing is nested and rotatably connected to the first housing, so that the second housing is retractable relative to the first housing. This allows the distance between the sound outlet and the user's ear canal to be adjusted when the open-back headphone is worn.

[0005] Based on the open-back headphones of this application embodiment, a second shell is spirally connected to a first shell, allowing the second shell to extend and retract relative to the first shell, thereby adjusting the distance from the sound outlet to the ear canal opening. Therefore, when a user feels the volume of the speaker assembly is too low, the distance from the sound outlet to the ear canal opening can be shortened by extending and retracting the second shell to increase the sound. When a user feels discomfort due to the unsuitable location of the second shell at the ear canal opening, the distance between the second shell and the ear canal opening can be increased by extending and retracting the second shell. With this configuration, the ear clip-on headphones of this application can adjust the distance between the sound outlet and the user's ear canal opening when worn, thus adapting to users with different ear sizes and improving the listening experience. Attached Figure Description

[0006] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0007] Figure 1 This application provides a schematic diagram of the structure of an ear clip-on earphone in the first position after adjustment;

[0008] Figure 2 This application provides a schematic diagram of the structure of an ear clip-on earphone in a second position after adjustment;

[0009] Figure 3 A cross-sectional schematic diagram of the clip-on earphone provided in an embodiment of this application;

[0010] Figure 4 This is a first exploded view of the clip-on earphone provided in an embodiment of this application;

[0011] Figure 5 This is a second exploded view of the clip-on earphone provided in an embodiment of this application;

[0012] Figure 6 This is a schematic diagram of the structure of the knob provided in the embodiment of this application;

[0013] Figure 7 A schematic diagram of the knob provided in an embodiment of this application from another perspective;

[0014] Figure 8 This is a schematic diagram of the main housing structure provided in an embodiment of this application.

[0015] Explanation of icon numbers:

[0016] 1. Clip-on earphone; 10. Connecting bridge; 20. Functional component; 21. Housing; 30. Sound-generating component; 31. First housing; 311. Main housing; 311a. Opening groove; 311b. Mounting cavity; 311c. Notch groove; 311d. Slot; 3111. Outer shell; 3112. Inner cylinder; 3112a. Sound outlet; 3113. Front shell; 3114. Rear shell; 312. Knob; 3121. Sleeve 3122. Mounting part; 3123. Clearance groove; 3124. Connector; 3125. Inner fold; 313. Thread; 314. Slide groove; 315. Guide rib; 32. Second housing; 321. Sound outlet; 322. Spiral groove; 323. Guide groove; 33. Speaker assembly; 34. Limiting component; 341. Base; 342. Pin; 35. Damping component; 60. Acoustic damping net; 70. Protective net.

[0017] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0019] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0020] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] In related technologies, open-back headphones include clip-on headphones and ear-hook headphones. Taking clip-on headphones as an example, they are fixed to the user's ear by clamping onto the ear canal. The sound-producing component of clip-on headphones does not extend into the ear canal, and the sound output is usually fixed. Ear-hook headphones, on the other hand, have an ear hook that fixes the sound-producing component to the user's ear, and the distance between the component and the ear canal opening is also relatively fixed. This results in different distances between the sound output and the ear canal opening for different users. Especially for users with larger ears, the greater distance between the sound-producing component and the ear canal opening can lead to insufficient sound volume reaching the ear canal, resulting in a poor user experience.

[0023] This application provides an open-back headphone. It is understood that the open-back headphone of this application includes ear-hook headphones and clip-on headphones 1. Figure 1 A schematic diagram of an open-back headphone according to an embodiment of the present invention is shown. This embodiment uses an ear-clip type headphone 1 as an example to describe the open-back headphone according to the present invention. The ear-clip type headphone 1 can communicate with devices such as mobile phones, computers, MP3 players, and wearable audio devices. It is understood that, without departing from the concept of the present invention, the open-back headphone can also be designed in other forms, such as ear-hook headphones.

[0024] Please see Figure 1 and Figure 2 The clip-on earphone 1 includes a connecting bridge 10, a functional component 20, and a sound-generating component 30. Please refer to the reference. Figure 3 and Figure 4 The sound-generating component 30 includes a first housing 31, a second housing 32, and a speaker assembly 33. The second housing 32 has a sound outlet 321. The second housing 32 is nested and rotatably connected to the first housing 31 and is capable of telescopic movement relative to the first housing 31. The speaker assembly 33 can be mounted on the first housing 31 or on the second housing 32. The sound emitted by the speaker assembly 33 is propagated outward through the sound outlet 321 of the second housing 32. For example, the speaker assembly 33 is mounted on the first housing 31.

[0025] Functional component 20 includes a housing 21, a battery, a control circuit board, and a push-button switch (not shown). The battery and control circuit board are installed inside the housing 21. The battery provides power to the speaker assembly 33 and the control circuit board, which is electrically connected to the speaker assembly 33. The push-button switch is installed on the outer surface of the housing 21 and is electrically connected to the control circuit board, allowing the user to control the operating state of the sound-producing component 30 (e.g., switching songs, adjusting volume, powering on / off, etc.) via the push-button switch.

[0026] The outer shell 21 and the first housing 31 can be made of materials such as plastic or silicone, and this application does not impose any restrictions on their materials. The outer shell 21 and the first housing 31 can have the same or different shapes, and their volumes can also be the same or different. For example, the outer shell 21 can be approximately cylindrical or spherical. The first housing 31 can be approximately cylindrical or rectangular. In some other embodiments, the control circuit board can also be installed inside the first housing 31.

[0027] One end of the connecting bridge 10 is connected to the first housing 31 of the sound-generating component 30, and the other end is connected to the outer shell 21 of the functional component 20. When worn, the sound-generating component 30, the functional component 20, and the connecting bridge 10 work together to generate clamping force. When worn, the sound-generating component 30 is located within or partially within the concha, and the functional component 20 is located behind the auricle, such as behind the helix or antitragus. Thus, the sound-generating component 30 and the functional component 20 primarily clamp the auricle, maintaining its position in the ear. The connecting bridge 10 may include an outer sheath and a memory metal wire disposed within the outer sheath. The memory metal wire is typically composed of materials such as nickel, titanium, platinum, copper, and silver, possessing high elasticity, wear resistance, and stability. This ensures appropriate pressure between the sound-generating component 30 and the functional component 20 and the ear during wear, making the ear-clip earphone 1 more securely fixed around the ear and less prone to loosening or swinging.

[0028] Different people may have different distances from the edge of their ear to the ear canal opening. Therefore, when using clip-on headphones 1, with the spacing of the sound outlet 321 of the second shell 32 fixed, for users with larger ears, the distance between the sound outlet 321 of the second shell 32 and the ear canal opening may be too far, potentially causing the volume transmitted to the user's ear canal opening by the speaker assembly 33 to be too low. For users with relatively small ears, the second shell 32 may extend beyond the ear canal opening, and its position at the ear canal opening may be inappropriate, potentially causing ear discomfort or even pain. Additionally, the user may experience poor headphone sound quality.

[0029] Therefore, the inventive concept of this application lies in: nesting the second housing 32 with the first housing 31 and connecting them spirally, so that the second housing 32 can extend and retract relative to the first housing 31, thereby adjusting the distance from the sound hole 321 to the ear canal opening. Thus, when the user feels the volume of the speaker assembly 33 is too low, they can rotate the second housing 32 to shorten the distance from the sound hole 321 to the ear canal opening, thereby increasing the sound. When the user feels discomfort due to the unsuitable location of the second housing 32 at the ear canal opening, they can rotate the second housing 32 to increase the distance from the second housing 32 to the ear canal opening. With this configuration, the ear clip-on earphone 1 of this application can adjust the distance between the sound hole 321 and the user's ear canal opening when worn, thus making it suitable for users with different ear sizes.

[0030] In one embodiment, the first housing 31 and the second housing 32 are threaded together. Specifically, a threaded structure can be provided on the outer wall surface of the first housing 31 and the inner wall surface of the second housing 32, or a threaded structure can be provided on the inner wall surface of the first housing 31 and the outer wall surface of the second housing 32. With the cooperation of the threaded structure, the distance from the sound hole 321 to the ear canal opening can be adjusted by rotating the second housing 32, which is simple to operate.

[0031] Please see Figures 3 to 5 In one embodiment, one of the first housing 31 and the second housing 32 is provided with a helical groove 322, and the other is provided with a thread 313, which is threadedly engaged with the helical groove 322. Exemplarily, the first housing 31 is provided with the thread 313, which is helically arranged along the axial direction of the first housing 31. The second housing 32 is provided with the helical groove 322, which is helically arranged along the axial direction of the second housing 32. In use, the thread 313 can slide along the helical groove 322, thereby allowing the second housing 32 to extend and retract relative to the first housing 31, thus adjusting the distance between the sound outlet 321 and the user's ear canal opening. The helical connection method used for the first housing 31 and the second housing 32 in this application is simple to operate, and users can achieve precise control of the extension and retraction of the second housing 32 through helical fine-tuning to meet the adjustment needs of different users.

[0032] For ease of operation in order to achieve the telescopic movement of the second housing 32, please refer to [link / reference needed]. Figures 3 to 5 In this embodiment, the first housing 31 includes a main housing 311 and a knob 312. The knob 312 is rotatably fitted onto the outside of the main housing 311. One of the knob 312 and the second housing 32 is provided with a spiral groove 322, and the other is provided with a thread 313. For example, the knob 312 is provided with a thread 313, and the second housing 32 is provided with a spiral groove 322. In use, since the knob 312 is fitted onto the outside of the main housing 311 and is exposed, the user can rotate the knob 312, which will drive the thread 313 to rotate, thereby driving the second housing 32 to extend and retract. This operation is simple. Furthermore, in this application, the knob 312 being fitted onto the outside of the main housing 311 can also protect and conceal the second housing 32.

[0033] Of course, in other embodiments, the first housing 31 may not have a main housing 311 and a knob 312, and may be a single integral structure. Instead, the second housing 32 may be fitted onto the outside of the first housing 31 or embedded inside the first housing 31. By spiraling the second housing 32, the second housing 32 and the first housing 31 may be able to extend and retract relative to each other. Here, this application does not limit the specific spiral connection method of the first housing 31 and the second housing 32.

[0034] To improve the stability of the first housing 31 and the second housing 32 when they are spirally connected, a stop can be provided on one side of the thread 313 and the spiral groove 322 to avoid the risk of the first housing 31 and the second housing 32 separating after being spiraled to a certain position.

[0035] For further details, please refer to the following: Figure 6The knob 312 includes a sleeve portion 3121 and a mounting portion 3122. The sleeve portion 3121 is fitted onto the outside of the main housing 311, and the mounting portion 3122 is connected to the end of the sleeve portion 3121 away from the connecting bridge 10 and extends inward from the sleeve portion 3121. The mounting portion 3122 is provided with threads 313. In use, the user twists the sleeve portion 3121, which drives the mounting portion 3122 to rotate, allowing the threads 313 to engage with the spiral groove 322, thus enabling the second housing 32 to extend and retract. This design allows the mounting portion 3122 to be adjusted to accommodate the position of the threads 313, overcoming the wall thickness of the main housing 311 and enabling a spiral connection with the second housing 32 located inside the main housing 311.

[0036] In one embodiment, please refer to Figure 4 and Figure 5 A limiting member 34 is provided on the main housing 311 to limit the knob 312, preventing the knob 312 from detaching from the main housing 311 in the direction away from the connecting bridge 10. This ensures that the knob 312 rotates within a specific range, avoiding the situation where the knob 312 becomes loose and difficult to adjust during use. In some connection methods, the limiting member 34 can be connected to the side of the main housing 311 away from the connecting bridge 10 and abut against the mounting part 3122.

[0037] For easy installation of the limiting member 34 and the main housing 311, please refer to [link / reference]. Figure 4 and Figure 5 The limiting member 34 includes a base 341 and a pin 342, with the pin 342 protruding from the base 341. A slot 311d is provided on the end face of the main housing 311 away from the connecting bridge 10, and the pin 342 is inserted into the slot 311d. The base 341 limits the mounting portion 3122. When the limiting member 34 is installed with the main housing 311, the pin 342 can easily be inserted into the slot 311d on the main housing 311, achieving quick and stable installation and improving production efficiency. After installation, the base 341 limits the mounting portion 3122, ensuring that the mounting portion 3122 remains stable during operation and will not experience accidental displacement or loosening.

[0038] The mounting part 3122 is provided with a relief groove 3123 extending circumferentially therein. The pin 342 passes through the relief groove 3123. During the rotation of the knob 312 relative to the main housing 311, the pin 342 slides relative to the relief groove 3123. During the rotation of the knob 312, the pin 342 passes through the relief groove 3123 on the mounting part 3122 and slides along the relief groove 3123 during the rotation of the knob 312. In this way, the pin 342 will not interfere with the rotation of the knob 312.

[0039] Furthermore, the base 341 is arranged in a ring shape and surrounds the outer side of the second housing 32. This allows the base 341 to evenly distribute stress, improving the overall strength and stability of the structure. The base 341 forms a limiting hole through which the second housing 32 passes. After the limiting member 34 is installed, the base 341 also serves to limit and guide the movement of the second housing 32, making its extension and retraction smoother. Moreover, the ring-shaped base 341 is entirely exposed; in actual product design, it can be given a bright color or a smooth, technologically advanced outer surface, thereby enhancing the overall aesthetics of the earphone.

[0040] In some other embodiments, the limiting member 34 may also be formed with a protrusion on the inner wall surface of the knob 312 and a groove on the outer wall surface of the main housing 311. The groove is arranged around the main housing 311. After the knob 312 is sleeved on the outer wall surface of the main housing 311, the protrusion is embedded in the groove, which can also prevent the knob 312 from detaching from the main housing 311 during rotation.

[0041] For some structural forms, please refer to Figure 6 The mounting part 3122 includes a connecting body 3124 and an inner folded edge 3125 connected together. The end of the connecting body 3124 away from the inner folded edge 3125 is connected to the sleeve part 3121. The inner folded edge 3125 is provided with threads 313 and is spaced apart from the sleeve part 3121. In the above description, the clearance groove 3123 is provided on the connecting body 3124.

[0042] Further, please refer to Figure 6 and Figure 7 The sleeve portion 3121, the connecting body 3124, and the inner folded edge 3125 together form a sliding groove 314. At least a portion of the main housing 311 is embedded in the sliding groove 314 and can slide relative to it. That is, after assembly, the connecting body 3124 is in the form of spanning the end face of the main housing 311 away from the connecting bridge 10, so that the thread 313 on the inner folded edge 3125 can extend into the inside of the main housing 311 and screw into the spiral groove 322. With this configuration, after at least a portion of the main housing 311 is embedded in the sliding groove 314, the knob 312 can be prevented from disengaging from the main housing 311 in the direction close to the connecting bridge 10, while the limiting member 34 prevents the knob 312 from disengaging from the main housing 311 in the direction away from the connecting bridge 10. Thus, the stability of the knob 312 during operation can be improved.

[0043] Understandably, in other embodiments, the knob 312 may not have a mounting part 3122, but the thread 313 may be provided on the inner wall of the sleeve part 3121, and then the main housing 311 may have a groove for avoiding the thread 313. The thread 313 passes through the groove and extends into the inner side of the main housing 311 so as to be screwed into the spiral groove 322.

[0044] In some embodiments, please refer to Figure 3 The earcup-style earphone 1 also includes a damping component 35, which is sandwiched between the knob 312 and the main housing 311. The damping component 35 provides damping force during the rotation of the knob 312 and the main housing 311, thus providing a smoother tactile feedback and operation of the knob 312. The damping component 35 can be in the form of a damping ring, damping plate, etc., and can be made of materials including but not limited to silicone and rubber.

[0045] For further details, please refer to Figure 4 and Figure 5 The outer wall of the main housing 311 is also provided with a notch 311c, and the sleeve portion 3121 is received in the notch 311c, so that the outer wall of the sleeve portion 3121 is coplanar with the outer wall of the main housing 311. In this way, the outer wall of the ear clip-on earphone 1 will not have excessively protruding structures or parts, which can provide a better wearing experience for the user and avoid discomfort such as ear irritation. In addition, it can also make the overall appearance more beautiful and neat, and enhance the aesthetic value of the product.

[0046] To improve the stability of the second housing 32 during its telescopic movement, please refer to... Figures 3 to 5 The main housing 311 has an open groove 311a on the side facing the second housing 32. The second housing 32 is located in the open groove 311a and can slide along the open groove 311a. The open groove 311a can provide stable guidance and support for the second housing 32, reduce swaying and offset during movement, and improve the stability and reliability of the system.

[0047] For further details, please refer to the following: Figure 5 and Figure 8 The open groove 311a has a guide rib 315 on one of its walls and the second housing 32, while the other has a guide groove 323. Both the guide rib 315 and the guide groove 323 extend along the extension and retraction direction of the second housing 32, and the guide rib 315 slides into the guide groove 323. For example, the outer wall of the second housing 32 has a guide groove 323, and the wall of the open groove 311a has a guide rib 315. The guide rib 315 and the guide groove 323 cooperate with each other, effectively limiting the offset of the second housing 32 within the open groove 311a and ensuring that it slides along a set track. This design greatly improves guiding stability and reduces unnecessary shaking and deviation.

[0048] The main housing 311 includes an outer shell 3111 and an inner cylinder 3112. The inner cylinder 3112 is disposed inside the outer shell 3111, and an open groove 311a is formed between the inner cylinder 3112 and the outer shell 3111. A sound outlet 3112a is provided at the end of the inner cylinder 3112, and the sound outlet 3112a is connected to the sound outlet 321.

[0049] In some embodiments, please refer to Figure 4 , Figure 5 and Figure 8 The main housing 311 includes an outer shell 3111 and an inner cylinder 3112. The inner cylinder 3112 is disposed inside the outer shell 3111, and the inner cylinder 3112 and the outer shell 3111 cooperate to form an open groove 311a. A sound outlet 3112a is provided on the inner cylinder 3112, and the sound outlet 3112a communicates with the sound outlet 321. This embodiment also includes an acoustic damping mesh 60, which is installed on the second housing 32 and covers the sound outlet 3112a. Specifically, when the sound waves emitted by the speaker assembly 33 enter the acoustic damping mesh 60, the sound waves can be scattered upon contact, thereby changing the propagation path of the sound waves and reducing their direct propagation distance and intensity. The acoustic damping mesh 60 can also reflect sound waves of specific frequencies, guiding them to insensitive areas or redistributing the sound field, thereby reducing the noise impact on sensitive areas. In this way, the acoustic damping mesh 60 can adjust the sound quality of the clip-on headphones 1, improving the user experience.

[0050] To facilitate the mounting of the horn assembly 33 on the main housing 311, a mounting cavity 311b is formed within the main housing 311, and the horn assembly 33 is housed within the mounting cavity 311b. For some embodiments of this application, please refer to... Figure 8 The main housing 311 can be assembled from a front housing 3113 and a rear housing 3114, wherein the front housing 3113 and the rear housing 3114 together enclose a mounting cavity 311b, and the knob 312 can be sleeved on the outside of the front housing 3113, or simultaneously sleeved on the outside of both the front housing 3113 and the rear housing 3114. The aforementioned limiting member 34 is inserted into the front housing 3113, and the front housing 3113 is provided with the aforementioned inner cylinder 3112 and open groove 311a. In this way, the main housing 311 is divided into two parts, which facilitates processing and also facilitates installation and mating with other parts.

[0051] This embodiment also includes a protective mesh 70, which is installed on the second housing 32 and covers the sound outlet 321. The protective mesh 70 can be made of metal or plastic. The protective mesh 70 is mainly used to prevent external impurities from entering the earphone through the sound outlet 321, protecting the internal sound unit and other components, and extending the service life of the device.

[0052] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An open-back headphone, characterized in that, It includes a functional component, a sound-generating component, and a connecting bridge connecting the functional component and the sound-generating component. The sound-generating component includes: A first housing is connected to the connecting bridge; and The second housing has a sound outlet. The second housing is nested and rotatably connected to the first housing so that the second housing is retractable relative to the first housing, thereby allowing the distance between the sound outlet and the user's ear canal to be adjusted when the open-back headphones are worn.

2. The open-back headphone as described in claim 1, characterized in that, The second housing is threadedly fitted to the first housing.

3. The open-back headphone as described in claim 1, characterized in that, One of the first housing and the second housing is provided with a spiral groove, and the other housing is provided with a spiral thread, wherein the thread engages with the spiral groove.

4. The open-back headphone as described in claim 3, characterized in that, The first housing includes a main housing and a knob. The knob is rotatably fitted onto the outside of the main housing. One of the knob and the second housing is provided with the spiral groove, and the other is provided with the thread.

5. The open-back headphone as described in claim 4, characterized in that, The main housing is provided with a limiting member, which is used to limit the knob to prevent the knob from detaching from the main housing in a direction away from the connecting bridge.

6. The open-back headphone as described in claim 5, characterized in that, The knob includes a sleeve portion and a mounting portion extending inward from the sleeve portion. The sleeve portion is sleeved on the outside of the main housing. The mounting portion is connected to the end of the sleeve portion away from the connecting bridge. The mounting portion is provided with the thread. The second housing has the spiral groove. The limiting member is connected to the side of the main housing away from the connecting bridge and abuts against the mounting part.

7. The open-back headphone as described in claim 6, characterized in that, The limiting member includes a base and a pin, with the pin protruding from the base; The main housing has a slot on the end face away from the connecting bridge, the pin is inserted into the slot, and the base limits the mounting part.

8. The open-back headphone as described in claim 7, characterized in that, The mounting part is provided with a clearance groove extending circumferentially thereon, and the pin passes through the clearance groove. During the rotation of the knob relative to the main housing, the pin slides relative to the clearance groove.

9. The open-back headphone as described in claim 7, characterized in that, The base is arranged in a ring shape and has a limiting hole, through which the second shell passes.

10. The open-back headphone as described in claim 6, characterized in that, The mounting part includes a connecting body and an inner folded edge connected together. The connecting body is connected to the sleeve part. The inner folded edge is provided with the thread and is spaced apart from the sleeve part. The sleeve part, the connecting body and the inner folded edge together form a sliding groove. The first housing part is embedded in the sliding groove and can slide relative to each other along the sliding groove.

11. The open-back headphone as described in claim 6, characterized in that, A notch is provided on the outer wall surface of the main housing, and the sleeve portion is received in the notch. The outer wall surface of the sleeve portion is coplanar with the outer wall surface of the main housing.

12. The open-back headphone as described in claim 6, characterized in that, It also includes a damping component, which is sandwiched between the knob and the main housing, and is used to provide damping force during the rotation of the knob and the main housing.

13. The open-back headphone as described in any one of claims 4 to 12, characterized in that, The main housing has an open slot on the side facing the second housing, and the second housing is located in the open slot and can move in and out along the open slot.

14. The open-back headphone as described in claim 13, characterized in that, The open groove has a guide rib on one of its walls and the second housing, and a guide groove on the other. Both the guide rib and the guide groove extend along the extension and retraction direction of the second housing, and the guide rib and the guide groove are slidably engaged.

15. The open-back headphone as described in claim 13, characterized in that, The main housing includes an outer shell and an inner cylinder, the inner cylinder being disposed inside the outer shell, and the open slot being formed between the inner cylinder and the outer shell at a distance; The inner cylinder is provided with a sound outlet at its end, and the sound outlet is connected to the sound hole.

16. The open-back headphone as described in claim 15, characterized in that, It also includes a protective net, which is installed on the second housing and covers the sound outlet.

17. The open-back headphone as described in claim 15, characterized in that, It also includes an acoustic damping mesh, which is installed on the second housing and covers the sound outlet.

18. The open-back headphone as described in claim 17, characterized in that, The sound-generating component includes a speaker assembly, which is mounted on the first housing or the second housing. The sound emitted by the speaker assembly is transmitted to the user's ear canal through the sound outlet and the sound hole.

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