Open type earphone

Abstract

The invention belongs to the technical field of acoustic equipment, and relates to an open type earphone, the open type earphone comprises a sound production part and a wearing part, the sound production part comprises a shell and a sound outlet nozzle, the shell is connected with the wearing part, the sound outlet nozzle is provided with a sound outlet hole, the sound outlet nozzle is movably connected with the shell, and the wearing part is connected with the shell. The sound outlet nozzle can telescopically move relative to the shell, so that the distance between the sound outlet hole and an ear canal opening of a user can be adjusted when the open type earphone is worn; and in the contraction state, the sound outlet hole is separated from the ear canal opening of the user. According to the technical scheme of the invention, the sound outlet nozzle is configured to be telescopically movable relative to the shell, so that the distance between the sound outlet hole in the sound outlet nozzle and the ear canal opening of the user can be adjusted, and the listening use effect of the open type earphone can be improved.

Description

Technical Field

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

[0002] There are many types of headphones available now. For open-back headphones that can be worn directly on the user's ears, these headphones are usually relatively small in size and convenient to use. They can be used in various scenarios such as commuting to work, meetings, and sports, and are therefore very popular among consumers.

[0003] However, currently, for open-back headphones that are worn directly on the user's ear, the sound output port is usually not adjustable after wearing. In reality, different users have different ear sizes, resulting in varying distances between the sound output port and the ear canal opening. For users with larger ears, the distance between the sound output port and the ear canal opening can be too great, leading to significant sound leakage and a poor listening experience. Summary of the Invention

[0004] This application provides an open-back headphone that can improve the listening experience of open-back headphones.

[0005] In a first aspect, embodiments of this application provide an open-back headphone, which includes a sound-emitting part and a wearing part. The sound-emitting part includes a housing and a sound outlet. The housing is connected to the wearing part, and the sound outlet is movably connected to the housing. The sound outlet has a sound outlet hole and is retractable relative to the housing so that the distance between the sound outlet hole and the user's ear canal can be adjusted when the open-back headphone is worn. In the retracted state, the sound outlet hole is spaced apart from the user's ear canal.

[0006] The open-back headphones based on this application embodiment have a sound outlet movably connected to the housing, allowing the sound outlet to extend and retract relative to the housing. When the open-back headphones are worn, the distance between the sound outlet and the user's ear canal opening can be adjusted. Therefore, in actual use, if the distance between the sound outlet and the user's ear canal opening is too large, resulting in severe sound leakage and the user finding the volume of the open-back headphones too low, the distance between the sound outlet and the ear canal opening can be shortened by extending the sound outlet, thereby reducing sound leakage and increasing the volume. Conversely, if the user feels discomfort due to the location of the sound outlet in the ear canal opening, the distance between the sound outlet and the ear canal opening can be increased by retracting the sound outlet. With this design, the headphones of this application can be suitable for users with different ear sizes and achieve a better listening experience. Attached Figure Description

[0007] 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 this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the structure of an open-back headphone according to an embodiment of this application;

[0009] Figure 2 for Figure 1 A cross-sectional view of an open-back headphone;

[0010] Figure 3 for Figure 1 An exploded view of the open-back headphones;

[0011] Figure 4 This is a schematic diagram of the structure of an open-back headphone according to another embodiment of this application;

[0012] Figure 5 for Figure 4 A cross-sectional view of an open-back headphone;

[0013] Figure 6 This is a schematic diagram of the structure of an open-back headphone according to another embodiment of this application;

[0014] Figure 7 for Figure 6 An exploded view of the open-back headphones;

[0015] Figure 8 for Figure 6 A schematic diagram of the exploded structure of an open-back headphone from another perspective;

[0016] Figure 9 for Figure 6 A schematic diagram of an open-back headphone with the sound outlet in a retracted state.

[0017] Figure 10 for Figure 9 A cross-sectional view of an open-back headphone;

[0018] Figure 11 for Figure 6 A schematic diagram of the adjustment tube in an open-back headphone;

[0019] Figure 12 for Figure 6 A schematic diagram of a portion of the shell structure in an open-back headphone;

[0020] Figure 13 for Figure 6A structural diagram of the adjustment tube in an open-back headphone from another perspective;

[0021] Figure 14 This is a schematic diagram of the structure of an open-back headphone according to another embodiment of this application;

[0022] Figure 15 for Figure 14 A schematic diagram of an open-back headphone with the sound outlet in a retracted state.

[0023] Figure 16 for Figure 14 An exploded view of the open-back headphones;

[0024] Figure 17 for Figure 14 A three-dimensional structural diagram of the adjustment mechanism in an open-back headphone;

[0025] Figure 18 for Figure 14 A schematic diagram of the exploded structure of an open-back headphone from another perspective;

[0026] Figure 19 for Figure 14 A schematic diagram of the adjustment mechanism on the housing of an open-back headphone, showing part of the housing structure.

[0027] Figure 20 for Figure 19 A schematic diagram of the structure after removing the shell;

[0028] Figure 21 for Figure 14 A further exploded structural diagram of an open-back headphone;

[0029] Figure 22 for Figure 14 Another exploded view of the open-back headphones;

[0030] Figure 23 for Figure 14 A schematic diagram of the assembly of the wearing part and damping components in an open-back headphone;

[0031] Figure 24 for Figure 23 An exploded view of the damping components and bushings in the diagram;

[0032] Figure 25 for Figure 24 A cross-sectional view of the damping components and bushing in the assembled state.

[0033] Explanation of icon numbers:

[0034] 1. Open-back headphone; 10. Sound-producing part; 11. Housing; 111. Shaft hole; 112. Slot; 113. Notch; 114. Outer shell; 115. Inner cylinder; 116. Opening groove; 117. Sound outlet; 118. Bushing; 119. Mounting shaft; 12. Sound outlet; 121. Sound outlet; 13. Guide structure; 131. Guide groove; 132. Guide block; 14. Damping structure; 15. 151. Adjusting mechanism; 152. Adjusting knob; 153. Drive shaft; 154. Adjusting cylinder; 1541. Sleeve part; 1542. Mounting part; 1543. Connecting body; 1544. Inner folded edge; 1545. Clearance groove; 1546. Slide groove; 155. Transmission structure; 1551. Gear structure; 1552. First bevel gear; 1553. Second bevel gear; 1554. 1555, rack; 1556, thread; 1557, spiral groove; 1558, first tooth; 1559, second tooth; 16, limiting structure; 161, first limiting part; 162, second limiting part; 17, limiting element; 171, base; 172, pin; 173, limiting hole; 18, detection assembly; 181, detection element; 182, trigger element; 19, ear cap; 191, sound hole; 1 01. Speaker assembly; 102. Front cavity; 103. Rear cavity; 20. Wearing part; 30. Connecting bridge; 40. Ear hook; 41. Ear hook body; 411. Outer cover; 412. Memory metal part; 42. Shaft; 421. Ball head; 43. Damping assembly; 431. Damping spring; 432. Damping adjusting nut; 50. Battery compartment; 51. Battery; 60. Acoustic damping mesh; 70. Protective mesh.

[0035] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0037] 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 this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0038] In the description of this application, 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 the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, 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, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0039] 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 application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Headphones are a pair of transducers that receive electrical signals from a media player or receiver and convert them into audible sound waves using speakers placed close to the ears.

[0041] From the perspective of the overall development of the audio industry, wireless headphones are still a relatively new product. Wireless headphones utilize wireless communication technologies such as Bluetooth to achieve wire-free connectivity, allowing users to transmit audio wirelessly to mobile phones or other devices. The main advantages of wireless headphones include the absence of wires, portability, and ease of use.

[0042] There are many types of wireless headphones. For some open-back headphones that can be worn directly on the user's ears, these types of open-back headphones are usually relatively small in size and convenient to use. They can be used in various scenarios such as commuting to work, meetings, and sports, and are therefore very popular among consumers.

[0043] However, currently, for open-back headphones that are worn directly on the user's ear, the sound output port is usually not adjustable after wearing. In reality, different users have different ear sizes, resulting in varying distances between the sound output port and the ear canal opening. For users with larger ears, the distance between the sound output port and the ear canal opening is too great, potentially causing insufficient sound volume reaching the ear canal and resulting in poor listening quality and overall unsatisfactory performance.

[0044] Therefore, this application proposes an open-back headphone 1 that can achieve a good listening experience for different users.

[0045] Please see Figures 1 to 4 In this embodiment of the application, the open-back headphones 1 include a sound-emitting part 10 and a wearing part 20 connected to the sound-emitting part 10. The sound-emitting part 10 is used to generate sound signals, and the wearing part 20 can cooperate with the sound-emitting part 10 to wear the open-back headphones 1 on the user's ear.

[0046] The sound-emitting part 10 includes a housing 11 and a sound outlet 12. The housing 11 is connected to the wearing part 20. The sound outlet 12 has a sound outlet hole 121. The sound outlet 12 is movably connected to the housing 11 and is telescopically movable relative to the housing 11, so that the distance between the sound outlet hole 121 and the user's ear canal opening can be adjusted when the open-back earphone 1 is worn. It should be noted that the sound outlet 12 is telescopically movable relative to the housing 11 and has an extended state and a retracted state. When the sound outlet 12 is in the retracted state, the sound outlet hole 121 is spaced apart from the user's ear canal opening; when the sound outlet 12 is in the extended state, the sound outlet hole 121 and the user's ear canal opening may or may not be spaced apart, which will be described in detail below.

[0047] Understandably, the sound-generating part 10 also includes a speaker assembly 101 disposed within the housing 11. The speaker assembly 101 is the core component for generating sound, converting electrical signals into sound signals. The speaker assembly 101 can be, for example, a dynamic loudspeaker or an electrostatic loudspeaker. The sound generated by the speaker assembly 101 is propagated to the outside through the sound outlet 121. Furthermore, the open-back earphone 1 of this application is an air-conduction earphone, meaning that the sound generated by the speaker assembly 101 propagates through the air and enters the user's ear canal. In addition, the open-back earphone 1 of this application will also be provided with a battery 51 (see...). Figure 21 The battery 51 and the electronic control board (not shown) can be located together with the speaker assembly 101 in the sound-emitting part 10. Alternatively, other arrangements are possible, such as the control board and speaker assembly 101 being located in the sound-emitting part 10, while the battery 51 is located in the wearing part 20; or the battery 51 and the electronic control board being located in the wearing part 20, while the speaker assembly 101 is located in the sound-emitting part 10; or the speaker assembly 101 and the main control board being located in the sound-emitting part 10, while the battery 51 is located in the wearing part 20. All these arrangements are feasible. The battery 51 can be a rechargeable lithium battery or a disposable dry cell battery; this application does not limit its use.

[0048] The open-back headphone 1 based on this application embodiment has a sound outlet 12 movably connected to the housing 11, allowing the sound outlet 12 to extend and retract relative to the housing 11, thereby adjusting the distance between the sound outlet 121 and the user's ear canal opening. Therefore, in actual use, if the distance between the sound outlet 121 on the sound outlet 12 and the user's ear canal opening is too large, resulting in severe sound leakage and causing the user to feel the volume of the open-back headphone 1 is too low, the distance between the sound outlet 121 and the ear canal opening can be shortened by extending the sound outlet 12, thus reducing sound leakage and increasing the volume. Conversely, if the user feels discomfort due to the unreasonable location of the sound outlet 12 in the ear canal opening area, the distance between the sound outlet 12 and the ear canal opening can be increased by retracting the sound outlet 12. With this design, the open-back headphone 1 of this application can be suitable for users with ears of different sizes and achieves a better listening experience.

[0049] Please refer to the reference. Figures 5 to 10 The housing 11 can protect the speaker assembly 101. That is, the speaker assembly 101 can be fixedly installed inside the housing 11, that is, the speaker assembly 101 is located inside the housing 11 and divides the housing 11 into a front cavity 102 and a rear cavity 103 (see reference). Figure 10 The sound outlet 121 communicates with the front cavity 102. During the extension and retraction of the sound outlet 12, the position of the speaker assembly 101 within the housing 11 remains unchanged. Based on this, the housing 11 can be a slotted structure with an opening, and the sound outlet 12 covers the opening of the housing 11. The sound emitted by the speaker assembly 101 propagates outward through the opening and the sound outlet 121 on the sound outlet 12. The sound outlet 121 on the sound outlet 12 is in the form of multiple micropores arranged in an array. Of course, the housing 11 can also be a relatively closed cavity structure without an opening (such as...). Figure 7 The housing 11 is provided with a sound outlet 117 corresponding to the sound outlet 121. The sound outlet 117 is also in the form of multiple micro-holes arranged in an array. The sound emitted by the speaker assembly 101 is transmitted outward through the sound outlet 117 and the sound outlet 121 on the sound outlet 12.

[0050] In both of the above structural forms, the sound outlet 12 is a cover with an opening on one side, and the sound outlet 12 and the housing 11 are slidably fitted together. When the housing 11 is an open groove structure, the sound outlet 12 can be nested inside the housing 11; of course, the sound outlet 12 can also be fitted onto the outside of the housing 11. When the housing 11 is a relatively closed cavity structure, the sound outlet 12 can be fitted onto the outside of the housing 11. In the above-example sliding fit between the housing 11 and the sound outlet 12, the speaker assembly 101 can also be disposed on the sound outlet 12 (e.g., Figure 2 (As shown), in this configuration, the speaker assembly 101 moves relative to the housing 11 during the extension and retraction of the mouthpiece 12.

[0051] In other embodiments, in order to enable the sound outlet 12 to extend and retract relative to the housing 11, the two can be connected by a telescopic component. For example, the sound outlet 12 can be connected to the housing 11 by a bellows structure. In this way, the extension and retraction of the sound outlet 12 relative to the housing 11 can be achieved by extending and retracting the bellows structure.

[0052] The sound outlet 12 can be manually driven to extend and retract relative to the housing 11. Alternatively, it can be driven by a drive mechanism.

[0053] To prevent the sound outlet 12 from twisting relative to the housing 11 during the extension and retraction of the sound outlet 12, this application further provides a guide structure 13 between the sound outlet 12 and the housing 11. The guide structure 13 is used to prevent the sound outlet 12 from twisting circumferentially with the housing 11 during the extension and retraction process. Specifically, as follows... Figure 2 and Figure 8 As shown, the guide structure 13 may include a guide groove 131 and a guide block 132. The guide groove 131 may be disposed on the mouthpiece 12 or on the housing 11, and extends in the extension and retraction direction of the mouthpiece 12. The guide block 132 slides along the guide groove 131. That is, the positions of the guide groove 131 and the guide block 132 in this application can be interchanged between the mouthpiece 12 and the housing 11. By setting the guide structure 13, relative torsion between the mouthpiece 12 and the housing 11 is avoided. Therefore, when the cross-sectional shape of the mouthpiece 12 and the housing 11 is not circular, interference between the mouthpiece 12 and the housing 11 can be effectively avoided, and deformation of the mouthpiece 12 structure can be prevented.

[0054] Of course, in other structural forms, the guide structure 13 may not be provided, and the effect may be achieved through the shape setting between the housing 11 and the sound outlet 12. For example, the cross-sectional contour shape of the housing 11 and the sound outlet 12 may be set as racetrack-shaped, polygonal, etc., so that there are mutually sliding and engaging planes between the housing 11 and the sound outlet 12, thereby preventing the sound outlet 12 from twisting relative to the housing 11 during the pulling process.

[0055] In practical use, after adjusting the extension and retraction of the sound outlet 12, the user desires that the sound outlet 12 remain in the adjusted position to adapt to various movement scenarios. This can be achieved through the friction between the sound outlet 12 and the housing 11. In one implementation, the sound outlet 12 and the housing 11 can be an interference fit, and the contact surfaces can be deformed and compressed to a certain extent; for example, the contact surfaces of the sound outlet 12 and the housing 11 can be made of soft rubber material. In another implementation, a damping structure 14 can be provided between the sound outlet 12 and the housing 11. That is, the damping structure 14 itself generates elastic deformation and resistance to prevent the sound outlet 12 from becoming loose relative to the housing 11.

[0056] Specifically, the damping structure 14 can be a damping ring, damping sheet or other structure made of silicone material. Taking the sound outlet 12 nested inside the housing 11 as an example, the damping ring is sandwiched between the outer wall of the housing 11 and the sound outlet 12. There may be a fixing groove on the sound outlet 12 or the housing 11, and the damping ring is embedded and fixed in the fixing groove.

[0057] Please refer to Figure 6 and Figure 7 To facilitate user adjustment of the sound outlet 12, enabling it to extend and retract relative to the housing 11, the open-back headphones 1 can further be equipped with an adjustment mechanism 15. This mechanism drives the sound outlet 12 to extend and retract relative to the housing 11. Understandably, by providing the adjustment mechanism 15, users can operate the mechanism to extend and retract the sound outlet 12 while the headphones 1 are being worn. This allows users to directly determine the adjustment amount of the sound outlet 12 by adjusting the volume, making it more convenient to use. Of course, users can also operate the adjustment mechanism 15 to extend and retract the sound outlet 12 to a suitable position before wearing the headphones 1, even when they are not being worn.

[0058] In one embodiment, the adjustment mechanism 15 may consist only of an adjustment element 151, which is specifically in the form of a lever (not shown). The lever is exposed outside the housing 11 and fixedly connected to the sound outlet 12. The user can directly push the lever to drive the sound outlet 12 to slide telescopically relative to the housing 11. Alternatively, the adjustment element 151 may also be a screw, which drives the sound outlet 12 to extend or retract. The screw is threaded to the housing 11 and rotatably connected to the sound outlet 12, thus facilitating the extension and retraction of the sound outlet 12.

[0059] In other embodiments, the adjustment mechanism 15 may include an adjustment member 151 and a transmission structure 155. The transmission structure 155 is drively connected to the adjustment member 151 and the sound outlet 12. The adjustment member 151 is movably connected to the housing 11 and is used to drive the sound outlet 12 to extend and retract relative to the housing 11 via the transmission structure 155. Thus, by changing the movement mode and direction of the adjustment member 151 during the adjustment process through the transmission structure 155, a driving force is ultimately generated to drive the sound outlet 12 to extend and retract relative to the housing 11. The advantage of this arrangement is that the shape of the adjustment member 151 and its position on the housing 11 can be configured in a way that is more convenient for user operation. The transmission structure 155 can be of various types, such as a screw drive structure, gear drive structure, sprocket drive structure, pulley drive structure, lead screw drive structure, etc., and this application does not limit this type.

[0060] Please refer to Figures 6 to 10 The transmission structure 155 is a threaded transmission structure. The transmission structure 155 includes a first helical structure and a second helical structure. The first helical structure is disposed on one of the adjusting member 151 and the sound outlet 12, and the second helical structure is disposed on the other of the adjusting member 151 and the sound outlet 12. The first helical structure and the second helical structure are helically engaged.

[0061] In this embodiment, the sound outlet 12 is sleeved inside the housing 11, and the adjusting member 151 includes an adjusting cylinder 154, which is rotatably sleeved on the outside of the housing 11. The adjusting cylinder 154 and the sound outlet 12 are helically engaged to drive the sound outlet 12 to extend and retract relative to the housing 11. It is understood that with the helical engagement of the adjusting cylinder 154 and the sound outlet 12, stepless adjustment during the extension and retraction of the sound outlet 12 can be achieved, making it convenient to use. The first helical structure and the second helical structure are respectively a helical groove 1556 and a thread 1555, thus achieving helical transmission through the engagement of the helical groove 1556 and the thread 155. Specifically, the helical groove 1556 is provided on one of the adjusting cylinder 154 and the sound outlet 12, and the thread 1555 is provided on the other, with the helical groove 1556 and the thread 1555 screwed together. In this embodiment, the adjustment mechanism 15 drives the sound outlet 12 to extend and retract during the rotation of the adjustment cylinder 154 via a threaded transmission. The entire transmission structure 155 uses fewer parts and has a more compact structure.

[0062] For example, the adjusting cylinder 154 is provided with threads 1555, and the sound outlet 12 is provided with a spiral groove 1556. In use, since the adjusting cylinder 154 is sleeved on the outside of the housing 11 and is in an exposed form, the user can rotate the adjusting cylinder 154 to drive the threads 1555 to rotate, thereby driving the sound outlet 12 to move in and out. This operation is simple. In addition, since the adjusting cylinder 154 is sleeved on the outside of the housing 11, the adjusting cylinder 154 can also protect and hide the sound outlet 12 when it is in the retracted state.

[0063] For further details, please refer to the following: Figure 7 and Figure 8 as well as Figure 10 The adjusting cylinder 154 includes a sleeve portion 1541 and a mounting portion 1542. The sleeve portion 1541 is fitted onto the outside of the housing 11, and the mounting portion 1542 is connected to the end of the sleeve portion 1541 away from the wearing portion 20 and extends inward from the sleeve portion 1541. The mounting portion 1542 is provided with threads 1555. In use, the user rotates the sleeve portion 1541, thereby driving the mounting portion 1542 to rotate, so that the threads 1555 can engage with the spiral groove 1556, allowing the sound outlet 12 to extend and retract. This design allows the mounting portion 1542 to accommodate the position of the adjusting threads 1555, overcoming the wall thickness of the housing 11 and enabling a spiral connection with the sound outlet 12 located inside the housing 11.

[0064] Of course, the first and second helical structures can also be internal and external threads, respectively, thus enabling helical transmission through the engagement of the internal and external threads. Specifically, the internal thread is located on the adjusting cylinder 154, and the external thread is located on the housing 11. The engagement of the internal and external threads provides more precise adjustment.

[0065] In one embodiment, a limiting member 17 is provided on the housing 11 to limit the adjustment cylinder 154, preventing it from detaching from the housing 11 in a direction away from the wearing part 20. This ensures that the adjustment cylinder 154 rotates within a specific range, avoiding the situation where the adjustment cylinder 154 becomes loose and difficult to adjust during use. In some connection methods, the limiting member 17 can be connected to the side of the housing 11 away from the wearing part 20 and abut against the mounting part 1542.

[0066] For easy installation of the limiting member 17 and the housing 11, please refer to... Figure 10 and Figure 11The limiting member 17 includes a base 171 and a pin 172, with the pin 172 protruding from the base 171. A slot 112 is provided on the end face of the housing 11 away from the wearing part 20, and the pin 172 is inserted into the slot 112. The base 171 limits the mounting part 1542. When the limiting member 17 is installed with the housing 11, the pin 172 can be easily inserted into the slot 112 on the housing 11, achieving quick and stable installation and improving production efficiency. After installation, the base 171 limits the mounting part 1542, ensuring that the mounting part 1542 remains stable during operation and does not experience accidental displacement or loosening.

[0067] The mounting part 1542 is provided with a relief groove 1545 extending circumferentially therein. The plug 172 passes through the relief groove 1545. During the rotation of the adjusting cylinder 154 relative to the housing 11, the plug 172 slides relative to the relief groove 1545. In this way, the plug 172 will not interfere with the rotation of the adjusting cylinder 154.

[0068] Furthermore, the base 171 is arranged in a ring shape and surrounds the outside of the sound outlet 12. This allows the base 171 to evenly distribute stress, improving the overall strength and stability of the structure. The base 171 forms a limiting hole 173 through which the sound outlet 12 passes. After the limiting member 17 is installed, the base 171 also serves to limit and guide the movement of the sound outlet 12, making its extension and retraction smoother. Moreover, the ring-shaped base 171 is entirely exposed; in actual product design, the base 171 can be given a bright color or a smooth, technologically advanced side surface, thereby enhancing the overall aesthetics of the open-back headphone 1.

[0069] In some other embodiments, the limiting member 17 may also be formed with a protrusion on the inner wall surface of the adjusting cylinder 154 and a groove on the outer wall surface of the housing 11, wherein the groove is provided around the housing 11. After the adjusting cylinder 154 is fitted onto the outer wall surface of the housing 11, the protrusion is embedded in the groove, which can also prevent the adjusting cylinder 154 from detaching from the housing 11 during rotation.

[0070] For some structural forms, please refer to Figure 11 and Figure 13 The mounting part 1542 includes a connecting body 1543 and an inner folded edge 1544 connected together. The end of the connecting body 1543 away from the inner folded edge 1544 is connected to the sleeve part 1541. The inner folded edge 1544 is provided with threads 1555 and is spaced apart from the sleeve part 1541. In the above description, a clearance groove 1545 is provided on the connecting body 1543.

[0071] Furthermore, the sleeve portion 1541, the connecting body 1543, and the inner folded edge 1544 together form a sliding groove 1546. At least a portion of the housing 11 is embedded in the sliding groove 1546 and can slide relative to it along the sliding groove 1546. That is, after assembly, the connecting body 1543 is in the form of spanning the end face of the housing 11 away from the wearing part 20, so that the threads 1555 on the inner folded edge 1544 can extend into the inside of the housing 11 and screw into the spiral groove 1556. With this configuration, after at least a portion of the housing 11 is embedded in the sliding groove 1546, the adjusting cylinder 154 can be prevented from disengaging from the housing 11 in the direction close to the wearing part 20, while the limiting member 17 prevents the adjusting cylinder 154 from disengaging from the housing 11 in the direction away from the wearing part 20. Thus, the stability of the adjusting cylinder 154 during operation can be improved.

[0072] Understandably, in other embodiments, the adjusting cylinder 154 may not have a mounting part 1542, but instead the thread 1555 is provided on the inner wall of the sleeve part 1541, and then the housing 11 is provided with a groove for avoiding the thread 1555. The thread 1555 passes through the groove and extends into the inner side of the housing 11 so as to be helically engaged with the spiral groove 1556.

[0073] In some embodiments, the open-back headphone 1 further includes a damping component sandwiched between the adjusting cylinder 154 and the housing 11. This damping component provides damping force during rotation of the adjusting cylinder 154 and the housing 11, thus providing a smoother rotational damping feel and allowing for smoother operation of the adjusting cylinder 154. The damping component 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.

[0074] For further details, please refer to Figure 7 , Figure 8 , Figure 12 The outer wall of the housing 11 is also provided with a notch 113, and the sleeve portion 1541 is received in the notch 113, so that the outer wall of the sleeve portion 1541 is coplanar with the outer wall of the housing 11. In this way, the outer wall of the open-back 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.

[0075] To improve the stability of the extension and retraction movement of the sound outlet 12, please refer again. Figure 7 , Figure 8 , Figure 12The housing 11 has an open groove 116 on the side facing the mouthpiece 12. The mouthpiece 12 is located in the open groove 116 and can slide along the open groove 116. The open groove 116 can provide stable guidance and support for the mouthpiece 12, reduce swaying and offset during movement, and improve the stability and reliability of the system.

[0076] Specifically, the housing 11 includes an outer shell 114 and an inner cylinder 115. The inner cylinder 115 is disposed inside the outer shell 114, and an open groove 116 is formed between the inner cylinder 115 and the outer shell 114. The end of the inner cylinder 115 is provided with a sound outlet 117, which communicates with the sound outlet 121.

[0077] In the above-mentioned spiral fit structure of the adjusting cylinder 154 and the sound outlet 12, the sound outlet 12 can be fitted inside the housing 11 or outside the housing 11, and the adjusting cylinder 154 is fitted outside the housing 11 and the sound outlet 12.

[0078] This embodiment also includes an acoustic damping mesh 60, which is installed in the inner cylinder 115 and covers the sound outlet 117. Specifically, when sound waves emitted by the speaker assembly 101 enter the acoustic damping mesh 60, the sound waves are 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, directing 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 open-back headphones 1, improving the user experience.

[0079] This embodiment also includes a protective mesh 70, which is installed on the sound outlet 12 and covers the sound outlet 121. 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 open-back headphone 1 through the sound outlet 121, protecting the internal sound unit and other components, and extending the service life of the device.

[0080] Please refer to Figures 14 to 18 The transmission structure 155 is a gear transmission structure. The transmission structure 155 includes a gear structure 1551 and a rack 1554. The gear structure 1551 is connected to the drive shaft 153, and the rack 1554 meshes with the gear structure 1551 and is fixedly connected to the sound outlet 12. In this embodiment, the gear transmission structure has the advantages of reliable structure and relatively stable performance. The gear structure 1551 may include one gear or multiple gears, without specific limitation.

[0081] In this embodiment, the adjusting member 151 includes an adjusting knob 152 and a drive shaft 153 connected to the adjusting knob 152. The adjusting knob 152 is exposed outside the housing 11, and the housing 11 is provided with a shaft hole 111. The drive shaft 153 is rotatably inserted through the shaft hole 111 and is connected to the transmission structure 155. The adjusting knob 152 is used to drive the sound outlet 12 to extend and retract relative to the housing 11 through the transmission structure 155. Specifically, the user rotates the adjusting knob 152, which drives the transmission structure 155 through the drive shaft 153, thereby generating a driving force to drive the sound outlet 12 to extend and retract. It can be understood that when the adjusting member 151 is the adjusting knob 152, it has the advantage of being relatively convenient to operate.

[0082] Furthermore, please refer to the following: Figures 19 to 21 The gear structure 1551 includes a first bevel gear 1552 and a second bevel gear 1553 that mesh with each other. The drive shaft 153 is drivenly connected to the first bevel gear 1552. The housing 11 is provided with a mounting shaft 119. The second bevel gear 1553 is rotatably sleeved on the mounting shaft 119. The second bevel gear 1553 includes a first tooth 1557 and a second tooth 1558 that are coaxially arranged. The first tooth 1557 meshes with the first bevel gear 1552, and the second tooth 1558 meshes with the rack 1554.

[0083] In this embodiment, the first bevel gear 1552 is fixedly sleeved on the drive shaft 153, while the first tooth 1557 of the second bevel gear 1553 is a bevel tooth adapted to mesh with the first bevel gear 1552, and the second tooth 1558 is a straight tooth adapted to mesh with the rack 1554. Thus, through the transmission and engagement of the two bevel gears, the adjustment knob 152 can be positioned on the side of the housing 11 facing away from the user's ear when the open-back headphones 1 are worn, and the rotation of the adjustment knob 152 can be converted into the extension and retraction of the sound outlet 12. That is, the user can directly rotate the adjustment knob 152 while the open-back headphones 1 are worn, thereby conveniently driving the sound outlet 12 to extend and retract. This structural form has the advantages of simple structure and fewer parts.

[0084] Further, please refer to Figures 16 to 18 In this embodiment, a limiting structure 16 is also provided on the sound-emitting part 10. The limiting structure 16 includes a first limiting part 161 and two second limiting parts 162. The first limiting part 161 is disposed on one of the adjusting knob 152 and the housing 11, and the two second limiting parts 162 are arranged at intervals on the other of the adjusting knob 152 and the housing 11. When the adjusting knob 152 is rotated to the maximum adjustment angle position, the first limiting part 161 selectively engages with one of the two second limiting parts 162 for limiting.

[0085] The two second limiting parts 162 are respectively arranged at the extreme positions of the extended and retracted positions of the sound outlet 12. Through the cooperation of the first limiting part 161 and the second limiting part 162, a clearer tactile feedback can be provided during user operation, thereby avoiding over-rotation or under-rotation of the adjustment knob 152, thus improving the convenience of use.

[0086] Specifically, the first limiting part 161 is a ball bearing disposed on the adjusting knob 152, and the second limiting part 162 is a stop groove disposed on the housing 11. The ball bearing structure includes a cylindrical shell, a spring, and a ball. The spring is housed in the cylindrical shell and supported between the ball and the cylindrical shell. When the adjusting knob 152 is rotated to the maximum angle position, the ball bearing is driven by the spring and engages in the stop groove. At this time, the user can obtain audible and tactile feedback. With the limiting structure 16 consisting of a ball bearing and a stop groove, it also helps the adjusting knob 152 to remain stably in the adjusted position.

[0087] It is understandable that the limiting structure 16 can be in other structural forms besides those listed above. For example, the first limiting part 161 can be composed of a spring sheet structure, while the second limiting part 162 still adopts the form of a stop groove. Alternatively, the first limiting part 161 and the second limiting part 162 can be a stop block structure that mutually stops and cooperates. This application does not limit this.

[0088] The above examples illustrate several embodiments of adjusting the mouthpiece 12 by means of a manually driven adjustment mechanism 15.

[0089] However, the adjustment mechanism 15 of this application can also be self-driven during the extension and retraction adjustment of the sound outlet 12. For example, the adjustment mechanism 15 includes a drive device to drive the transmission structure 155, thereby driving the extension and retraction of the sound outlet 12. The transmission structure 155 can adopt the structure exemplified in this application. Of course, in this embodiment, the transmission structure 155 can also be omitted, and the extension and retraction of the sound outlet 12 can be directly driven by the drive device.

[0090] The driving device can be in the form of a motor, air pump, etc. For user convenience, the adjustment element 151 is configured as an adjustment button. In this embodiment, the adjustment button can be a physical button on the housing 11, such as two buttons representing "+" and "-". When the user presses the "+" button, the driving device extends the sound outlet 12 relative to the housing 11; when the user presses the "-" button, the driving device retracts the sound outlet 12 relative to the housing 11. This design makes operation more convenient. Besides physical buttons, they can also be virtual buttons in an application on an electronic terminal. That is, the driving device in this embodiment can also be controlled remotely via a remote control signal. This way, the user does not need to touch the open-back headphones 1 during adjustment, making it even more convenient to use.

[0091] In summary, by configuring the sound outlet 12 to be able to extend and retract relative to the housing 11, and in conjunction with the adjustment mechanism 15, this embodiment of the application allows different users to adjust the distance between the sound outlet 12 and the ear canal opening according to their own wearing needs, so as to obtain the best listening effect of the open-back headphones 1.

[0092] It should also be noted that in the above-described embodiments, the adjustment member 151, which is operated by the user to trigger the extension and retraction of the sound outlet 12 relative to the housing 11, is exposed outside the housing 11. Specifically, it can be located on the side of the housing 11 facing away from the user's ear when the open-back headphones 1 are in the wearing state. Since electronic components such as circuit boards and speaker assemblies 101 are installed on the housing 11 away from the sound outlet 12, this application can further position the adjustment member 151 on the side of the speaker assembly 101 closer to the sound outlet 12. This facilitates user operation and avoids making the housing 11 too large, resulting in a more compact overall structure.

[0093] like Figure 14 , Figure 16 , Figure 18 As shown, the adjustment member 151 and the sound outlet 12 of this application are disposed on different sides of the housing 11. Specifically, the sides of the housing 11 include a first side facing away from the user's ear when the open-back headphones 1 are worn, and a second side away from the wearing part 20. The adjustment member 151 can be located on the first side, while the sound outlet 12 is located on the second side. This arrangement meets the adjustment needs of the user when the open-back headphones 1 are worn in actual use, making it more convenient to use.

[0094] The open-back earphone 1 of this application embodiment can have multiple wearing methods to adapt to the usage needs of different usage scenarios.

[0095] For example, in one embodiment, when the sound outlet 12 is in a retracted state, the sound outlet 121 is spaced apart from the user's ear canal opening; when the sound outlet 12 is in an extended state, the sound outlet 121 is not spaced apart from the user's ear canal opening. Specifically, the sound outlet 12 moves telescopically between a first position and a second position relative to the housing 11; when the sound outlet 12 is in the first position, the sound outlet 12 is extended relative to the housing 11, and part of the sound outlet 12 and the sound outlet 121 extend into the user's ear canal opening, at which time the sound outlet 121 is not spaced apart from the user's ear canal opening; when the sound outlet 12 is in the second position, the sound outlet 12 is retracted relative to the housing 11, the sound outlet 12 is located outside the user's ear canal opening, and the sound outlet 121 is spaced apart from the ear canal opening. It should be noted that in this embodiment, the first position and the second position represent the limit states of the sound outlet 12 during the adjustment process, and in actual use, the user can also adjust the sound outlet 12 to an intermediate position between the first position and the second position according to their own situation.

[0096] When the sound outlet 12 is in the first position, because part of the sound outlet 12 and the sound outlet 121 extend into the user's ear canal, the open-back headphone 1 switches to an in-ear wearing mode. This effectively isolates external noise, allowing for clear sound quality without excessive volume, protecting hearing, and creating a more immersive listening experience. It provides excellent bass response and detail resolution, meeting the needs of music lovers. When the sound outlet 12 is in the second position, because the sound outlet 12 is located outside the user's ear canal and the sound outlet 121 is spaced from the ear canal opening, the open-back headphone 1 switches to an open-back wearing mode. This allows external ambient sounds to enter, naturally blending with the sound played by the open-back headphone 1, providing a more open and transparent listening experience and reducing the pressure of prolonged listening. The open-back headphone 1 of this application can switch between in-ear and open-back wearing modes, greatly enriching the usage scenarios of the open-back headphone 1 and making it more convenient to use.

[0097] Of course, the open-back earphone 1 of this application may also only have an open-back wearing mode, in which the sound outlet 121 is always spaced from the ear canal opening during the extension and retraction of the sound outlet 12. That is, the sound outlet 121 is always spaced from the user's ear canal opening when the sound outlet 12 is in the retracted state and the extended state.

[0098] Furthermore, the sound-emitting part 10 also includes an ear cap 19, which is fitted over the sound outlet 12 and has a sound-emitting hole 191. The ear cap 19 is used to seal against the user's ear canal opening when the sound outlet 12 is in the first position. The ear cap 19 is made of a flexible material, such as silicone. By setting the ear cap 19, a tighter seal can be achieved at the ear canal opening, which can more effectively isolate external noise.

[0099] Please refer to Figure 19 The sound-emitting part 10 of this application may further include a detection component 18, which is used to generate a position detection signal during the telescopic movement of the sound outlet 12 relative to the housing 11. Specifically, the detection component includes a detection element 181 and a trigger element 182. The detection element 181 is disposed on the housing 11, and may be disposed inside the housing 11 and connected to a circuit board inside the housing 11. The trigger element 182 is disposed on the sound outlet 12. There may be one or two detection elements 181. When there is only one detection element 181, the position of the sound outlet 12 can be determined by the signal change of the detection element 181. When there are two detection elements 181, the two detection elements 181 may be respectively set to correspond to a first position and a second position, so that the position of the sound outlet 12 can be determined by obtaining different signals from the detection elements 181. For example, when the sound outlet 12 is in the first position, the corresponding detection element 181 and trigger element 182 are signal coupled to generate a detection signal, and when the sound outlet 12 is in the second position, another corresponding detection element 181 and trigger element 182 are signal coupled to generate another detection signal.

[0100] With the above settings, when the open-back headphones 1 are in the in-ear state, the open-back headphones 1 of this application can reduce the output power of the speaker assembly 101, which can ensure the listening effect while also effectively protecting the user's ears. When the open-back headphones 1 are in the open state, in order to ensure the listening effect, the output power of the speaker assembly 101 can be increased accordingly to increase the volume, thus improving the usage effect of the open-back headphones 1.

[0101] Specifically, the trigger 182 can be a magnet, while the detection element 181 can be a Hall sensor. Of course, in other forms, the detection component 18 can also be a micro switch or a photoelectric switch, and this application does not limit this.

[0102] During use, the open-back earphone 1 of this application can be worn by attaching to the user's ear via the wearing part 20. Its overall structure is relatively small and easy to carry.

[0103] Please refer to Figures 22 to 24 The open-back headphone 1 of this application can be an ear-hook type headphone. Specifically, the wearing part 20 includes an arc-shaped ear hook 40, which is connected to the shell 11 and is used to hang between the back of the user's ear and head. The ear hook 40 is a flexible, elongated structure with deformability and adapts to the contour of the ear, thus accommodating ears of different sizes. It eliminates the need to select a specific size based on ear size, making it suitable for most people and highly versatile.

[0104] The wearing part 20 may further include a battery compartment 50, which is connected to the end of the ear hook 40 away from the sound-generating part 10. The battery compartment 50 contains a battery 51 that powers the speaker assembly 101. The battery 51 and the speaker assembly 101 are electrically connected via a wire passing through the ear hook 40. The main control board in the open-back headphones 1 can be located in the sound-generating part 10 or in the battery compartment 50. This layout, where the battery compartment 50 is positioned between the back of the user's ear and head during wear, and the battery compartment 50 has a certain weight, results in a more balanced weight distribution on the ear, making the headphones more comfortable and stable to wear.

[0105] Understandably, when the open-back headphone 1 is an ear-hook type, the wearing part 20 may only include the ear hook 40. In this case, the battery 51 and the speaker assembly 101 are both located inside the housing 11 of the sound-emitting part 10. This arrangement allows for a shorter wiring between the battery 51 and the speaker assembly 101. In this case, the size of the ear hook 40 can be adjusted accordingly to obtain better wearing comfort and stability.

[0106] In actual use of the open-back headphones 1, since everyone's ear size is different, the position where the sound-emitting part 10 contacts the ear may also vary slightly. Furthermore, as mentioned above, the open-back headphones 1 of this application can be worn in the ear. Therefore, to achieve a better wearing experience, the ear hook 40 and the shell 11 can be further configured as a rotatable connection. With this configuration, the user can adjust the posture of the sound-emitting part 10 by rotating it to change the orientation of the sound outlet 12. On the one hand, after the sound outlet 12 is extended and retracted, it achieves the optimal posture, allowing the sound to enter the ear canal better. On the other hand, by adjusting the posture of the sound-emitting part 10, the sound outlet 12 can be aligned with the ear canal opening and partially enter the ear canal after extension, achieving a good seal with the skin of the ear canal and effectively isolating external noise.

[0107] In one embodiment, the ear hook 40 includes an ear hook body 41 and a pivot 42. The pivot 42 is connected to the end of the ear hook body 41, and the end of the pivot 42 away from the ear hook body 41 is rotatably connected to the housing 11. The ear hook body 41 may include an outer sheath 411 and a shape memory metal component 412 (see [reference]). Figure 21 The outer cover 411 is made of soft rubber and wraps around a memory metal component 412, while the pivot 42 is fixed to the end of the outer cover 411. This gives the ear hook body 41 good deformability and toughness. The end of the pivot 42 is provided with a ball head 421 that is rotatably connected to the housing 11. This facilitates a stable rotatable connection between the pivot 42 and the housing 11 and prevents it from easily coming loose.

[0108] Furthermore, a damping component 43 is also provided on the housing 11, which elastically abuts against the rotating shaft 42. In this embodiment, by having the damping component 43 elastically abut against the rotating shaft 42, during the rotation adjustment of the sound-emitting part 10 relative to the rotating shaft 42, the damping component 43 provides tactile feedback to the user during the adjustment process. On the other hand, after the rotation adjustment, the damping component 43 can also provide damping force to ensure that the sound-emitting part 10 remains stably in the adjusted posture. When not subjected to too much impact force, the posture of the sound-emitting part 10 remains unchanged, which is beneficial for use in sports scenarios.

[0109] Please refer to the reference. Figures 23 to 25 The damping assembly 43 includes a damping spring 431 and a damping adjusting nut 432. The damping adjusting nut 432 is threadedly connected to the housing 11, and the damping spring 431 is clamped between the damping adjusting nut 432 and the ball head 421. In this embodiment, a mounting hole is formed on the housing 11, through which the rotating shaft 42 passes. The ball head 421 is located inside the housing 11 and is stopped by the inner wall of the housing 11 in the direction of separation from the housing 11. This structure allows for a stable connection between the rotating shaft 42 and the housing 11, and the damping assembly 43 and the ball head 421 have a large contact area, resulting in better damping effect. During assembly, the tightness of the damping adjusting nut 432 can be adjusted to regulate the elastic pressure of the damping spring 431 against the ball head 421, thereby adjusting the damping force and achieving optimal damping feel.

[0110] To facilitate assembly, this application can also provide a bushing 118 on the housing 11. The aforementioned mounting hole is formed by the bushing 118, and the outer diameter of the ball head 421 is larger than the inner diameter of the bushing 118. The bushing 118 can be made of metal. In this way, during assembly, the rotating shaft 42 can be passed through the bushing 118 first, and then the bushing 118 can be fixed to the housing 11. The bushing 118 and the housing 11 can be fixed by adhesive bonding, heat fusion, etc. With this structure, during the rotation of the sound-generating part 10, there is essentially mutual friction between the rotating shaft 42 and the bushing 118. This can avoid wear on the material of the housing 11 during long-term use, thereby extending its service life.

[0111] The above describes the case where the open-back headphone 1 of this application is an ear-hook type headphone. However, the open-back headphone 1 of this application can also be an ear clip type headphone, wherein... Figures 1 to 10An example of an ear clip-on headphone is shown. Specifically, the wearing part 20 includes a connecting bridge 30 and a battery compartment 50. The two ends of the connecting bridge 30 are respectively connected to the housing 11 and the battery compartment 50, and the housing 11 and the battery compartment 50 are disposed opposite to each other. The connecting bridge 30 is arc-shaped and is also an elastic structure, providing elastic clamping force for wearing the entire open-back headphone 1. In the actual wearing process, the sound-emitting part 10 is located in front of the ear, while the battery compartment 50 is located behind the ear and between the head. The connecting bridge 30 spans the ear in the front-back direction, so that the sound-emitting part 10 and the battery compartment 50 cooperate to clamp the auricle.

[0112] In the case of the open-back earphone 1 of this application being an ear clip-on earphone, it can adapt to various ear shapes, remain stable even during exercise, and is not easy to fall off, making it suitable for high-intensity activities such as fitness and running.

[0113] 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 application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., 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 application 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 application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0114] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An open-back headphone, characterized in that, include: Wearing part; as well as The sound-emitting part includes a housing and a sound outlet. The housing is connected to the wearing part, and the sound outlet is movably connected to the housing. The sound outlet has a sound outlet hole and is retractable relative to the housing so that the distance between the sound outlet hole and the user's ear canal can be adjusted when the open-back headphones are worn. In the contracted state, the sound outlet is spaced apart from the user's ear canal opening.

2. The open-back headphone as described in claim 1, characterized in that, The open-back headphones also include an adjustment mechanism for driving the sound outlet to move telescopically relative to the housing.

3. The open-back headphone as described in claim 2, characterized in that, The adjustment mechanism includes an adjustment element and a transmission structure. The transmission structure is tractively connected to the adjustment element and the sound outlet. The adjustment element is movably connected to the housing. The adjustment element is used to drive the sound outlet to extend and retract relative to the housing through the transmission structure.

4. The open-back headphone as described in claim 3, characterized in that, The transmission structure includes a gear structure and a rack. The gear structure is connected to the adjusting member, the rack meshes with the gear structure, and is fixedly connected to the sound outlet.

5. The open-back headphone as described in claim 4, characterized in that, The adjusting component includes an adjusting knob and a drive shaft connected to the adjusting knob. The adjusting knob is exposed outside the housing. The housing is provided with a shaft hole. The drive shaft is rotatably inserted through the shaft hole and is connected to the transmission structure.

6. The open-back headphone as described in claim 5, characterized in that, The gear structure includes a first bevel gear and a second bevel gear that mesh with each other. The drive shaft is driven to connect with the first bevel gear. The housing is provided with a mounting shaft. The second bevel gear is rotatably sleeved on the mounting shaft. The second bevel gear includes a first tooth and a second tooth arranged coaxially, the first tooth meshing with the first bevel gear, and the second tooth meshing with the rack.

7. The open-back headphone as described in claim 5, characterized in that, The sound-emitting part is also provided with a limiting structure; the limiting structure includes a first limiting part and two second limiting parts. The first limiting part is disposed on one of the adjusting knob and the housing, and the two second limiting parts are arranged at intervals on the other of the adjusting knob and the housing. When the adjusting knob is rotated to the maximum adjustment angle position, the first limiting part selectively engages with one of the two second limiting parts.

8. The open-back headphone as described in claim 7, characterized in that, The first limiting part is a ball on the adjustment knob, and the second limiting part is a stop groove on the housing.

9. The open-back headphone as described in claim 3, characterized in that, The transmission structure includes a first spiral structure and a second spiral structure. The first spiral structure is disposed on one of the adjusting member and the sound outlet, and the second spiral structure is disposed on the other of the adjusting member and the sound outlet. The first spiral structure and the second spiral structure are spirally engaged.

10. The open-back headphone as described in claim 9, characterized in that, The adjusting component includes an adjusting cylinder, which is rotatably fitted onto the outside of the housing. The adjusting cylinder drives the sound outlet to extend and retract relative to the housing via the transmission structure.

11. The open-back headphone as described in claim 10, characterized in that, The first spiral structure is a spiral groove, and the second spiral structure is a thread; the adjusting cylinder includes a sleeve portion and an mounting portion extending inward from the sleeve portion. The sleeve portion is fitted onto the outside of the housing, and the mounting portion is connected to the end of the sleeve portion away from the wearing portion. The mounting portion is provided with the thread, and the sound outlet is provided with the spiral groove.

12. The open-back headphone as described in claim 3, characterized in that, The open-back headphones also include a speaker assembly located within the housing, and the adjustment element is exposed outside the housing and located on the side of the speaker assembly near the sound outlet.

13. The open-back headphone as described in claim 12, characterized in that, The adjusting element and the sound outlet are located on different sides of the housing.

14. The open-back headphone as described in claim 2, characterized in that, The adjustment mechanism includes a drive device for driving the sound outlet to move telescopically relative to the housing.

15. The open-back headphone as described in any one of claims 1 to 14, characterized in that, A guide groove is provided on one of the inner wall of the housing and the sound outlet, and a guide block is provided on the other of the inner wall of the housing and the sound outlet. The guide groove extends along the telescopic movement direction of the sound outlet, and the guide block is slidably disposed in the guide groove.

16. The open-back headphone as described in any one of claims 1 to 14, characterized in that, The sound-producing part also includes an ear cap, which is fitted over the outside of the sound outlet and has a sound-producing hole that communicates with the sound outlet.

17. The open-back headphone as described in any one of claims 1 to 14, characterized in that, The wearing part includes an arc-shaped ear hook, which is connected to the housing and is used to hang between the back of the user's ear and the head.

18. The open-back headphone as described in claim 17, characterized in that, The ear hook is rotatably connected to the housing.

19. The open-back headphone as described in claim 18, characterized in that, The ear hook includes an ear hook body and a rotating shaft. The rotating shaft is connected to the end of the ear hook body, and the end of the rotating shaft away from the ear hook body is rotatably connected to the housing.

20. The open-back headphone as described in claim 19, characterized in that, The end of the rotating shaft is provided with a ball head, which is rotatably connected to the housing.

21. The open-back headphone as described in claim 20, characterized in that, The housing is also provided with a damping component, which elastically abuts against the ball head.

22. The open-back headphone as described in claim 21, characterized in that, The damping assembly includes a damping spring and a damping adjusting nut. The damping adjusting nut is threadedly connected to the housing, and the damping spring is clamped between the damping adjusting nut and the ball head.

23. The open-back headphone as described in claim 17, characterized in that, The wearing part also includes a battery compartment, which is connected to the end of the ear hook away from the sound-producing part.

24. The open-back headphone as described in any one of claims 1 to 14, characterized in that, The wearing part includes a connecting bridge and a battery compartment. The two ends of the connecting bridge are respectively connected to the housing and the battery compartment, and the housing and the battery compartment are disposed opposite to each other.

25. The open-back headphone as described in any one of claims 1 to 14, characterized in that, It also includes a detection component, which includes a detection element and a trigger element. The detection element is disposed on the housing, and the trigger element is disposed on the sound outlet. During the extension and retraction movement of the sound outlet, the detection element is triggered by the trigger element to generate a position detection signal.

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