Open earphone

Abstract

The application discloses an open earphone, which comprises a wearing part, a sound generating part, a first loudspeaker and a second loudspeaker. The wearing part is used for wearing the open earphone on the ear of a user. The sound generating part comprises a shell and a sound outlet. The shell is connected with the wearing part. The sound outlet is provided with a first sound outlet hole. The sound outlet is movably connected with the shell. The sound outlet is telescopically movable relative to the shell, so that the open earphone can adjust the distance between the first sound outlet hole and the ear canal opening of the user when being worn. The first loudspeaker is arranged in the sound outlet. The second loudspeaker is arranged in the shell. The open earphone can realize a better listening effect.

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] Open-back headphones do not completely isolate external sounds, allowing the wearer to hear ambient noises such as car sounds and other people's calls. This characteristic is crucial during outdoor activities (like running or cycling) or walking on the street, effectively preventing accidents caused by not being able to hear external sounds and improving personal safety. In-ear headphones, on the other hand, go directly into the ear canal, better isolating external noise and allowing sound to enter the ear more directly. Therefore, they have advantages in detail reproduction and low-frequency performance.

[0003] In real life, consumers often switch between different life scenarios, so there is a high demand for dual-form headphones that combine the advantages of both open-back and in-ear headphones. Summary of the Invention

[0004] This application provides an open-back headphone, which is designed to be suitable for use by users in different scenarios and has excellent sound quality.

[0005] The open-back headphones provided in this application include a wearing part, a sound-emitting part, a first speaker, and a second speaker. The wearing part is used to wear the open-back headphones on the user's ears. The sound-emitting part includes a housing and a sound outlet. The housing is connected to the wearing part, and the sound outlet has a first sound outlet hole. The sound outlet hole is movably connected to the housing and can extend and retract relative to the housing so that the distance between the first sound outlet hole and the user's ear canal can be adjusted when the open-back headphones are worn. The first speaker is disposed inside the sound outlet hole, and the second speaker is disposed inside the housing.

[0006] Based on the open-back headphones of this application embodiment, the sound outlet is movably connected to the shell, allowing the sound outlet to extend and retract relative to the shell. When the open-back headphones are worn, the distance between the first sound outlet and the user's ear canal can be adjusted. Thus, the open-back headphones of this application can not only meet the needs of open-back wearing, but also allow different users to adjust the position of the sound outlet according to their own ear size to obtain the best wearing and listening effect. Furthermore, the design of the sound outlet being able to extend and retract relative to the shell allows the open-back headphones of this application to also meet the needs of in-ear wearing, thereby achieving better sound isolation.

[0007] Furthermore, the open-back headphones of this application have a first speaker installed inside the sound outlet and a second speaker installed inside the housing. The first and second speakers can be configured to handle different frequency bands; for example, the first speaker handles high frequencies, while the second speaker handles mid and low frequencies. Since high-frequency sounds have shorter wavelengths and higher directivity, they tend to concentrate and propagate over short distances. Placing the first speaker, responsible for high frequencies, inside the sound outlet, close to the first sound hole, ensures better directivity and concentration of high-frequency sounds during propagation, reducing diffusion and attenuation along the propagation path, thereby improving the clarity and detail of high-frequency sounds. Low and mid-frequency sounds, on the other hand, have longer wavelengths and stronger diffusion, allowing them to propagate over a wider area. Placing the second speaker, responsible for low and mid frequencies, inside the housing utilizes the internal space of the housing as a resonance cavity, enhancing the resonance effect of low and mid-frequency sounds and improving the fullness and layering of the sound. Therefore, the configuration of this embodiment better utilizes the advantages of acoustic principles and structure to improve the sound quality performance of the open-back headphones. Attached Figure Description

[0008] 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.

[0009] Figure 1 This is a schematic diagram of the structure of an open-back headphone according to an embodiment of this application;

[0010] Figure 2 This is a schematic diagram of the structure of the sound-emitting part and the ear cap according to an embodiment of this application;

[0011] Figure 3 for Figure 2 A partial structural cross-sectional view of the mid-voice section and ear cap;

[0012] Figure 4 for Figure 2 A partial structural cross-sectional view of the center-outlet nozzle in its first position;

[0013] Figure 5 for Figure 2 A partial structural cross-sectional view of the center-outlet nozzle in its second position;

[0014] Figure 6 for Figure 1 An exploded structural diagram of the open-back headphone section;

[0015] Figure 7 for Figure 1Another exploded structural diagram of the open-back headphone section.

[0016] Explanation of icon numbers:

[0017] 100. Open-back headphones; 10. Sound-emitting part; 10a. Sound outlet channel; 10b. Coupled sound cavity; 11. Housing; 11a. Second sound outlet; 11b. Guide groove; 11c. Slot; 11d. Second sound cavity; 11e. Mounting port; 111. Housing body; 112. Bracket; 12. Sound outlet; 12a. First sound outlet; 12b. Sound guide hole; 12c. First sound cavity; 121. Guide block; 20. First speaker; 20a. Guide hole; 30. Second speaker; 40. Adjustment mechanism; 41. Piezoelectric vibrator; 42. Friction component; 50. Detection assembly; 51. Detection component; 60. Noise-canceling microphone; 70. Ear cap; 70a. Sound outlet; 80. Wearing part; 90. Sealing structure; 91. Elastic seal; 911. Annular base; 912. Pin.

[0018] 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

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Furthermore, in related technologies, open-back headphones are equipped with only one speaker, a design that has significant shortcomings in sound quality performance. For example, in open-back wearing scenarios, users have higher requirements for the layering and richness of sound quality. A single speaker is difficult to meet users' expectations for sound quality in this scenario, especially in terms of the balance between bass and treble.

[0028] Therefore, this application proposes an open-back headphone 100 that can achieve a good listening experience for different users.

[0029] Please see Figure 1In this embodiment of the application, the open-back headphones 100 includes a sound-emitting part 10 and a wearing part 80 connected to the sound-emitting part 10. The sound-emitting part 10 is used to generate sound signals, and the wearing part 80 can cooperate with the sound-emitting part 10 to wear the open-back headphones 100 on the user's ear. The wearing part 80 can be designed as an ear hook or an ear clip to ensure the stability of the open-back headphones 100.

[0030] The open-back headphone 100 of this application can be an ear-hook type headphone. Specifically, the wearing part 80 includes an arc-shaped ear hook connected to the shell 11. The ear hook is used to hang between the back of the user's ear and the head. The ear hook is a flexible, elongated structure with deformability and conforms to the contour of the ear, thus adapting to different ear sizes. It eliminates the need to select a specific size based on ear size, making it suitable for most people and highly versatile.

[0031] The wearing part 80 may further include a battery compartment connected to the end of the ear hook away from the sound-generating part 10. The battery compartment houses a battery that powers the speaker assembly. The battery and speaker are electrically connected via a wire passing through the ear hook. The main control board in the open-back headphone 100 can be located in the sound-generating part 10 or in the battery compartment. This layout, where the battery compartment is positioned between the back of the user's ear and head during wear, and the battery compartment has a certain weight, results in a more balanced weight distribution on the ear, making the open-back headphone 100 more comfortable and stable to wear.

[0032] Please see Figures 1 to 3The sound-emitting part 10 includes a housing 11 and a sound outlet 12. The housing 11 is connected to the wearing part 80. The sound outlet 12 has a first sound outlet 12a, which is located at the front end of the sound outlet 12, referring to the end facing the user's ear canal. The sound outlet 12 is movably connected to the housing 11, and the sound outlet 12 is telescopically movable relative to the housing 11, so that the distance between the first sound outlet 12a and the user's ear canal can be adjusted when the open-back headphones 100 are worn. It should be noted that the sound outlet 12 is telescopically movable relative to the housing 11 and has a first position, a second position, and a third position located between the first and second positions. When the sound outlet 12 is in the first position, the first sound outlet 12a is spaced apart from the user's ear canal opening, which can be understood as the open-back headphone 100 being in an open-back wearing state. When the sound outlet 12 is in the second position, the front end of the sound outlet 12, i.e., the part with the first sound outlet 12a, is inserted into the user's ear canal opening, which can be understood as the open-back headphone 100 being in an in-ear wearing state. When the sound outlet 12 is in the third position, the first sound outlet 12a and the user's ear canal opening may or may not be spaced apart, which can be understood as the open-back headphone 100 being in a semi-in-ear wearing state. The following will provide a detailed description.

[0033] Specifically, the sound outlet 12 is a cover with an opening on one side, and the sound outlet 12 is slidably fitted onto the housing 11. 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.

[0034] The sound outlet 12 can be telescopically movable relative to the housing 11, which can be manually adjusted by the user. In one embodiment, the sound outlet 12 and the housing 11 are slidably fitted together, allowing the user to easily slide the position of the sound outlet 12. This sliding fit allows for the use of fewer parts, simplifying the manufacturing process. Furthermore, to achieve the positioning of the sound outlet 12, two spaced-apart limiting holes are provided on the housing 11 along the telescopic direction of the sound outlet 12, while an elastic boss is provided on the sound outlet 12. When the sound outlet 12 slides to the appropriate position, the elastic boss can engage with the limiting holes, thereby achieving positioning.

[0035] In another embodiment, the sound outlet 12 is screwed to the housing 11, that is, the sound outlet 12 is provided with internal threads, while the housing 11 is provided with external threads. The sound outlet 12 is screwed to the housing 11. The screw connection can provide precise adjustment. The user can adjust the distance between the first sound outlet hole 12a on the sound outlet 12 and the ear canal opening by rotating it. The distance between the first sound outlet hole 12a and the ear canal opening can be shortened by extending the sound outlet 12.

[0036] 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.

[0037] Please see Figure 3 The open-back earphone 100 also includes a first speaker 20 and a second speaker 30. The first speaker 20 and the second speaker 30 are the core components of the open-back earphone 100 that convert electrical signals into sound signals. The open-back earphone 100 of this application is an air-conduction earphone, meaning that the sound generated by the first speaker 20 and the second speaker 30 is transmitted through the air and enters the user's ear canal. Furthermore, the open-back earphone 100 of this application also includes a battery (not shown) and a circuit board (not shown). The battery and circuit board can be located together with the first speaker 20 and the second speaker 30 in the sound-emitting section 10. Alternatively, other arrangements are possible, such as the circuit board and the first speaker 20 and the second speaker 30 being located together in the sound-emitting section 10, while the battery is located in the wearing section 80; or the battery and circuit board are located in the wearing section 80; or the main control board is located in the sound-emitting section 10, and the battery is located in the wearing section 80. All these arrangements are feasible. The battery can be a rechargeable lithium battery or a disposable dry cell battery; this application does not limit this.

[0038] The open-back headphone 100 according to 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. This adjusts the distance between the first sound outlet 12a and the user's ear canal opening. This allows the open-back headphone 100 to not only meet the requirements for open-back wearing but also to allow different users to adjust the position of the sound outlet 12 according to their ear size for optimal wearing and listening experience. Furthermore, the design of the sound outlet 12's ability to extend and retract relative to the housing 11 also enables the open-back headphone 100 to meet the requirements for in-ear wearing, thus achieving better sound isolation. Therefore, in actual use, if the distance between the first sound outlet 12a on the sound outlet 12 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 headphone 100 too low, the distance between the first sound outlet 12a and the ear canal opening can be shortened by extending the sound outlet 12, thereby reducing sound leakage and increasing the volume. When a user feels discomfort due to the location of the sound outlet 12 at the ear canal opening, 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 100 of this application can be suitable for users with ears of different sizes and achieve a better listening experience.

[0039] The first speaker 20 is disposed inside the sound outlet 12, which protects the first speaker 20. The first speaker 20 emits sound toward the first sound outlet 12a, which can be in the form of multiple micro-holes arranged in an array. The first speaker 20 can be fixed in the sound outlet 12, that is, during the extension and retraction of the sound outlet 12, the sound outlet 12 can drive the first speaker 20 to move. The position of the first speaker 20 in the sound outlet 12 will not change. Understandably, a front sound cavity is formed between the first speaker 20 and part of the inner wall of the sound outlet 12. The front sound cavity is used as the front cavity of the first speaker 20, and the front cavity of the first speaker 20 is connected to the first sound outlet 12a.

[0040] Considering the comfort of the sound outlet 12 when it enters the ear, the size of the first speaker 20 is usually set to be small. This results in poor sound quality and reduced loudness of the open-back headphones 100 when the sound outlet 12 is in the retracted state, which cannot meet the user's needs.

[0041] To address the aforementioned issues, this embodiment also includes a second speaker 30, housed within the housing 11, which protects the second speaker 30. Understandably, the second speaker 30 is further from the first sound outlet 12a than the first speaker 20. With the sound outlet 12 relatively constricted, the first speaker 20 and the second speaker 30 can be configured to handle different frequency bands; for example, the first speaker 20 can handle high frequencies, while the second speaker 30 can handle mid and low frequencies. Since high-frequency sounds have shorter wavelengths and higher directivity, they tend to concentrate and propagate over short distances. Placing the first speaker 20, responsible for high frequencies, within the sound outlet 12 and close to the first sound outlet 12a ensures better directivity and concentration of high-frequency sounds during propagation, reducing diffusion and attenuation along the propagation path, thereby improving the clarity and detail of high-frequency sounds. Low and mid-frequency sounds, on the other hand, have longer wavelengths and stronger diffusion, enabling them to propagate over a wider area. By placing the second speaker 30, responsible for low and mid frequencies, inside the housing 11, the internal space of the housing 11 can be used as a resonance cavity to enhance the resonance effect of low and mid frequencies, thereby improving the fullness and layering of the sound. Therefore, the arrangement in this embodiment can better utilize the advantages of acoustic principles and structure to improve the sound quality performance of the open-back headphones 100.

[0042] Please continue reading. Figure 3In order to achieve automatic extension and retraction of the sound outlet 12 and reduce the user's operational burden during wearing, in some embodiments, the open-back headphones 100 also includes an adjustment mechanism 40. The adjustment mechanism 40 is connected to the sound outlet 12 and is configured to drive the sound outlet 12 to extend and retract between a first position and a second position so that the distance between the sound outlet and the user's ear canal can be adjusted when the open-back headphones 100 are worn.

[0043] There are many types of adjustment mechanisms 40. The adjustment mechanism 40 can be driven by a magnetic force to move the sound outlet 12, or it can be driven by a motor; no specific limitation is made here. The adjustment mechanism 40 can be installed in many locations. It can be installed in the wearing part 80, or it can be installed inside the sound-emitting part 10. Preferably, the adjustment mechanism 40 is installed inside the sound-emitting part 10, which reduces the distance between the adjustment mechanism 40 and the sound outlet 12, thereby simplifying the structure of the adjustment mechanism 40.

[0044] There are many ways in which the user can control the adjustment mechanism 40 to operate. For example, the open-back headphones 100 may have a control button that extends out of the housing 11, allowing the user to control the adjustment mechanism 40. Alternatively, a circuit board may be electrically connected to the adjustment mechanism 40 and can connect to the user's mobile phone via Bluetooth, allowing the user to control the adjustment mechanism 40 by sending signals from the phone. Another example is the open-back headphones 100 may have a pressure sensor, allowing the user to control the adjustment mechanism 40 by pressing the sensor. Yet another example is the open-back headphones 100 equipped with a remote control, allowing direct control of the adjustment mechanism 40. Finally, the circuit board may have a voice control module electrically connected to the adjustment mechanism 40, receiving voice commands from the user to control the adjustment mechanism 40. These are just a few examples.

[0045] Please see Figure 4 and Figure 5 The adjustment mechanism 40 is configured to drive the sound outlet 12 to the first position (e.g., Figure 4 ) and second position (e.g. Figure 5The earpiece 12 can extend and retract between the in-ear and open-ear styles. In the first position, the sound outlet 12 is retracted relative to the housing 11, and in the second position, the sound outlet 12 extends relative to the housing 11 and abuts against the user's ear canal. It should be noted that the first and second positions represent the extreme states of the sound outlet 12 during adjustment. In actual use, the user can adjust the sound outlet 12 to a third position between the first and second positions according to their own needs. With this configuration, when the sound outlet 12 is in the second position, it can abut against the user's ear canal, thereby isolating some external sounds and achieving noise reduction. Furthermore, the open-ear headphone 100 can switch between in-ear and open-ear wearing modes, greatly enriching the usage scenarios of the open-ear headphone 100 and making it more convenient to use.

[0046] When the sound outlet 12 is in the first position, the sound outlet 12 is located outside the user's ear canal and the first sound outlet 12a is spaced apart from the ear canal opening, so that the open-back headphones 100 switch to an open-back wearing mode. This allows external ambient sounds to enter and blend naturally with the sound played by the open-back headphones 100, providing a more open and transparent listening experience and reducing the pressure of listening for a long time.

[0047] Furthermore, when the sound outlet 12 is in the second position, it blocks the user's ear canal opening. With this configuration, when the sound outlet 12 is in the second position, the open-back headphones 100 can effectively isolate external noise, allowing users to enjoy clear sound quality without excessively high volumes, protecting their hearing, and creating a more immersive listening experience. This provides excellent bass response and detail resolution, meeting the needs of music lovers.

[0048] When the sound outlet 12 is in the third position, users can adjust it to this position according to their needs and wearing comfort. In the third position, the sound outlet 12 is neither completely against the ear canal opening nor completely outside the ear canal opening, but rather in an intermediate state. This design allows users to flexibly adjust the position of the sound outlet 12 according to different usage scenarios and preferences to obtain a better listening experience and better wearing comfort.

[0049] Please see Figure 7To prevent relative torsion of the sound outlet 12 relative to the housing 11 during the extension and retraction of the sound outlet 12, this application further provides a guide structure between the sound outlet 12 and the housing 11. The guide structure prevents circumferential torsion of the sound outlet 12 relative to the housing 11 during extension and retraction. Specifically, as shown in the figure, the guide structure may include a guide groove 11b and a guide block 121. The guide groove 11b may be located on the sound outlet 12 or on the housing 11 and extends in the extension and retraction direction of the sound outlet 12. The guide block 121 slides along the guide groove 11b. In other words, the positions of the guide groove 11b and the guide block 121 in this application can be interchanged between the sound outlet 12 and the housing 11. By providing the guide structure, relative torsion between the sound outlet 12 and the housing 11 is avoided. Therefore, even when the cross-sectional shapes of the sound outlet 12 and the housing 11 are non-circular, interference between the sound outlet 12 and the housing 11 can be effectively prevented, and deformation of the sound outlet 12 structure can be avoided.

[0050] Of course, in other structural forms, a guide structure 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.

[0051] Please continue reading. Figure 7 Specifically, in some embodiments, the adjustment mechanism 40 includes a piezoelectric vibrator 41 and a friction element 42. The friction element 42 is disposed at the output end of the piezoelectric vibrator 41 and makes transmission contact with the sound outlet 12, so that the piezoelectric vibrator 41 drives the friction element 42 to move, thereby causing the sound outlet 12 to move along the extension and retraction direction. It should be noted that the ultrasonic vibration generated by the piezoelectric effect causes the friction element 42 fixed on the piezoelectric vibrator 41 to generate synchronous high-frequency vibration. This vibration can drive the sound outlet 12 to move linearly through the friction between the friction element 42 and the sound outlet 12. By adjusting the driving waveform, the sound outlet 12 can be moved along the contraction direction. This structural form has the advantages of simple structure and fewer parts.

[0052] The transmission contact between the friction element 42 and the sound outlet 12 can be achieved by setting a clamping part on the sound outlet 12 and clamping the friction element 42 by the clamping part, or by using electromagnetic attraction to make the sound outlet 12 and the friction element 42 in close contact, or by using the weight of the sound outlet 12 itself to press on the friction element 42. These methods will not be listed here.

[0053] To achieve a more compact arrangement of the friction element 42 within the sound-generating part 10, the first speaker 20 has a guide hole 20a through which part of the friction element 42 can pass, thus making more efficient use of the space within the sound-generating part 10. This design reduces mutual interference between components, making the overall structure of the open-back headphone 100 more compact, smaller in size, and easier to carry and wear.

[0054] Preferably, the adjustment mechanism 40 further includes a clamping member, one end of which is fixedly connected to the sound outlet 12, and the other end is provided with an elastic clamping part that clamps the outer peripheral wall of the friction member 42. This arrangement, by clamping the friction member 42 with the elastic clamping part, makes the transmission contact between the friction member 42 and the sound outlet 12 more stable, thereby allowing the adjustment mechanism 40 to better drive the movement of the sound outlet 12.

[0055] Furthermore, the friction element 42 is made of carbon fiber. Carbon fiber has high hardness, and in a piezoelectric ceramic-driven ultrasonic linear motion system, the friction element 42 needs to frequently contact the sliding block and generate friction. The high hardness of carbon fiber allows it to withstand this frictional action, reducing its own wear. For example, during prolonged linear motion, compared to some soft materials, the shape and dimensions of the friction element 42 made of carbon fiber remain more stable, thus maintaining stable frictional performance. Its good wear resistance extends the service life of the friction element 42. At the same time, using carbon fiber friction elements 42 reduces the frequency of component replacement and lowers maintenance costs.

[0056] Please see Figure 5 and Figure 7 In some embodiments, the friction element 42 is a carbon rod, which is elongated and extends along the length of the mouthpiece 12. The cross-sectional diameter of the carbon rod is 'a', and the diameter of the guide hole 20a is 'b', where b satisfies: (0.5mm+a)≤b≤(1.5mm+a), meaning the diameter of the guide hole 20a is 0.5mm to 1.5mm larger than the cross-sectional diameter of the carbon rod. An appropriate gap exists between the carbon rod and the guide hole 20a. This gap is not too tight to avoid excessive friction between the carbon rod and the hole wall of the guide hole 20a. If the gap is too small, it will increase the resistance during the movement of the carbon rod, making it difficult to slide smoothly, and may even cause jamming. Excessive friction will accelerate the wear of the carbon rod. If the gap is too small, for example, less than 0.5mm, the extension and retraction function of the mouthpiece 12 may not work properly. If the gap is large, for example, greater than 1.5mm, the adjustment mechanism 40 needs to transmit force through the carbon rod to move the mouthpiece 12. If the gap is too large, the transmission of force may be affected, causing the sound outlet 12 to fail to move or stop as expected.

[0057] In this embodiment, the housing 11 is fitted over the sound outlet 12, and the electronic control board is disposed inside the housing. In the second position, the electronic control board controls the first speaker 20 to work independently, that is, the first speaker 20 is responsible for the entire frequency range. Since the first sound outlet 12a is located at the front end of the sound outlet 12 in the second position, the sound outlet 12 extends out, and the part of the sound outlet 12 with the first sound outlet 12a extends into the ear canal opening, so that the sound can be transmitted more directly into the ear canal. The space inside the ear canal is relatively closed, and the sound reflection and standing wave effect are significantly reduced, reducing the loss and diffusion of sound during propagation, thereby providing a clearer and more focused sound quality. The clarity and detail of high-frequency sounds are more outstanding, while ensuring the transmission efficiency of mid- and low-frequency sounds.

[0058] While ensuring optimized sound quality, the second speaker 30 is not in operation at this time, which reduces the power consumption of the open-back headphones 100 in the second position. The power required to drive only one speaker is significantly lower than that required to drive two speakers at the same time, thus extending the battery life of the open-back headphones 100.

[0059] In the first position, the first sound outlet 12a is separated from the user's ear canal opening. Due to the more complex sound propagation path in space, reflections and standing wave effects are easily generated. In this scenario, a single speaker can hardly simultaneously meet the sound quality requirements of both high and mid-low frequencies. Therefore, the control board is used to control the first speaker 20 and the second speaker 30 to work simultaneously when the sound outlet 12 is in the first position. The first speaker 20 and the second speaker 30 can be configured to handle different frequency bands, such as the first speaker 20 handling high frequencies and the second speaker 30 handling mid and low frequencies, providing a more balanced sound quality performance, especially in terms of detail and layering in high and mid-low frequencies. By assigning high and mid-low frequencies to different speakers, the advantages of each speaker can be fully utilized. The first speaker 20 is located inside the sound outlet. Due to limited space, the first speaker 20 is usually smaller and can better handle high-frequency signals. The second speaker 30, located inside the housing 11, can be larger than the first speaker 20, allowing it to handle mid-low frequency signals through a larger diaphragm and a stronger magnetic circuit system.

[0060] It should be noted that when the sound outlet 12 is in the third position, the operating state of the first speaker 20 and the second speaker 30 can be the same as when the sound outlet 12 is in the second position, or can be appropriately adjusted according to the operating data of the first speaker 20 and the second speaker 30 in the second position.

[0061] like Figure 5As shown, to enable the second speaker 30 to more effectively output mid-to-low frequency sounds when the open-back headphone 100 is in the first position, a sound outlet channel 10a is defined between the sound outlet 12 and the housing 11. The sound outlet channel 10a is a narrow slit channel, which can be regarded as a special acoustic conduit. The acoustic conduit can guide and adjust the sound, especially in the low-frequency range, the conduit can act as a resonance cavity, enhancing the propagation efficiency of low-frequency sounds. By reasonably designing the length and width of the narrow slit, it can be ensured that low-frequency sounds are not lost due to spatial limitations during propagation, but can be enhanced through resonance. The side wall of the sound outlet 12 is provided with a sound guide hole 12b, which communicates with the space inside the sound outlet 12. The peripheral wall of the housing 11 is provided with a second sound outlet hole 11a, which can be arranged in a micro-pore array. The sound outlet channel 10a connects the sound guide hole 12b and the second sound outlet hole 11a.

[0062] In this design, the second sound outlet 11a is positioned closer to the first sound outlet 12a than the sound guide 12b. This results in a smaller propagation path and time difference between the two sound sources (the first speaker 20 and the second speaker 30) within the ear canal. Consequently, high-frequency sounds (output from the first speaker 20 through the first sound outlet 12a) and mid-to-low-frequency sounds (output from the second speaker 30 through the second sound outlet 11a) blend better within the ear canal. This arrangement reduces sound separation caused by excessive distance between sound sources, enhancing the overall sound quality and layering. It also reduces the sense of separation when sound reaches the ear canal, making the sound perceived by the user more natural and unified.

[0063] The sound guide hole 12b is positioned closer to the second speaker 30 than the first speaker 20, ensuring a shorter and more direct propagation path for mid-low frequency sounds from the second speaker 30 to the second sound outlet 11a. This design reduces energy loss during sound propagation, ensuring that mid-low frequency sounds are delivered to the ear canal more efficiently. The proximity of the sound guide hole 12b to the second speaker 30 allows for better coordination with its acoustic characteristics, enhancing the resonance of low-frequency sounds. This resonance improves the depth and power of low-frequency sounds, resulting in a fuller sound quality. It also reduces interference from high-frequency sounds generated by the first speaker 20 on mid-low frequency sounds, further improving the purity of the bass.

[0064] like Figure 5 and Figure 6As shown, the housing 11 has a mounting port 11e at the end away from the wearing part 80. The sound outlet 12 is movably mounted at the mounting port 11e and is retractable relative to the housing 11. To reduce sound leakage from the second speaker 30 and improve acoustic performance, the open-back headphone 100 also includes an elastic seal 91. The elastic seal 91 is mounted at the mounting port 11e and elastically abuts against the outer wall of the sound outlet 12. Specifically, the elastic seal 91 is annularly arranged, surrounding the outer periphery of the sound outlet 12, and elastically abuts against the outer wall of the sound outlet 12. The elastic seal 91 seals the gap between the mounting port 11e of the housing 11 and the sound outlet 12. This sealing design can significantly reduce the problem of sound leakage from the front narrow slit, ensuring that the sound of the second speaker 30 is mainly conducted through the preset second sound outlet 11a. Furthermore, through the sealing effect of the elastic seal 91, the resonance effect of the sound outlet channel 10a (narrow slit channel) can be better utilized. Narrow slit channels, as a special type of acoustic conduit, can guide and adjust sound. Especially in the low-frequency range, the conduit can act as a resonating cavity, enhancing the propagation efficiency of low-frequency sound.

[0065] Furthermore, the design of the elastic seal 91 allows the headphones to resist the intrusion of liquids such as sweat and rain, as well as dust, when used outdoors or during sports, protecting the first speaker 20 and the second speaker 30 inside the sound-emitting part 10 from damage and extending the service life of the headphones.

[0066] The elastic seal 91 is made of a material with high elasticity and flexibility. It can seal the gap between the housing 11 and the mouthpiece 12 without affecting the telescopic movement of the mouthpiece 12 relative to the housing 11. This ensures good sealing performance and effectively reduces the problem of sound leakage from the narrow gap at the front end.

[0067] Specifically, the elastic seal 91 includes an annular base 911 and multiple pins 912. The pins 912 are connected to the side of the annular base 911 facing the housing 11. The end face of the housing 11 away from the wearing part 80 is provided with multiple slots 11c. The multiple slots 11c are corresponding one-to-one with the multiple pins 912. The pins 912 can be inserted into the slots 11c to limit the elastic seal 91. The multiple pins 912 are arranged at intervals along the circumference of the annular base 911 so that the elastic seal 91 is tightly connected to the housing 11, ensuring the stability of the position of the elastic seal 91 and preventing displacement as the sound outlet 12 moves.

[0068] The sound guide hole 12b is the sound transmission channel from the second speaker 30 to the second sound outlet 11a. The sound guide hole 12b guides the sound from the second speaker 30 to an independent sound outlet channel 10a, avoiding direct interference with the first speaker 20 (high-frequency sound). In the first position, along the extension path of the sound outlet channel 10a, the sound outlet channel 10a connects the sound guide hole 12b and the second sound outlet 11a. Understandably, the second sound outlet 11a is the final output port of the sound from the second speaker 30.

[0069] like Figure 3 , Figure 4 and Figure 5 As shown, specifically, the first speaker 20 divides the space within the sound outlet 12 to form a first sound cavity 12c located behind the first speaker 20. The first speaker 20 can be positioned at the front of the sound outlet 12. The second speaker 30 divides the space within the housing 11 to form a second sound cavity 11d located in front of the second speaker 30. The second speaker 30 can be positioned at the rear of the housing 11. The first sound cavity 12c and the second sound cavity 11d are connected and together form a larger coupling sound cavity 10b. Because the coupling sound cavity 10b is larger, the diaphragm of the first speaker 20 will not excessively compress gas molecules when it vibrates during operation, thereby reducing the air pressure changes during the movement of the diaphragm of the first speaker 20. The coupling sound cavity 10b can provide a more stable vibration environment for the diaphragm of the first speaker 20 and reduce vibration instability caused by air pressure changes.

[0070] Furthermore, the coupling acoustic cavity 10b is connected to the sound guide hole 12b, which in turn is connected to the second sound outlet hole 11a via the sound outlet channel 10a. When the sound outlet 12 is in the first position, the coupling acoustic cavity 10b provides a larger acoustic volume for the second speaker 30, increasing the volume of low-frequency resonance and providing a resonance space for mid-low frequency sounds. This resonance space can enhance the propagation efficiency of low-frequency sounds, improve the depth and power of low-frequency sounds, and make the sound quality fuller. Additionally, the coupling acoustic cavity 10b separates the sound of the second speaker 30 from the sound of the first speaker 20, reducing mutual interference between high-frequency and mid-low frequency sounds. This crossover design can better utilize the advantages of each speaker unit, improving the clarity and layering of the sound quality.

[0071] The coupling cavity 10b is connected to the second sound outlet 11a through the sound guide hole 12b, which ensures that the sound of the second speaker 30 can be transmitted more directly to the second sound outlet 11a, reducing the sense of separation when the sound reaches the ear canal, and making the sound felt by the user more natural and uniform.

[0072] When the sound outlet 12 is in the second position, the second speaker 30 is not working. The second sound outlet, which is connected to the coupling acoustic cavity 10b, can be used as a pressure relief port for the first speaker 20. This helps to balance the air pressure inside the coupling acoustic cavity 10b and prevents the vibration performance of the first speaker 20 from being affected by excessive air pressure. There is no need to specially set up a pressure relief port, which simplifies the structure of the open-back headphone 100.

[0073] Please continue reading as follows Figure 3 , Figure 4 and Figure 5 To further improve the listening experience of the open-back headphones 100 in this embodiment, the open-back headphones 100 also include a noise-canceling microphone 60. The noise-canceling microphone 60 can capture external noise and generate sound waves with opposite phase using a built-in noise-canceling algorithm, which cancel out the noise waves, thereby reducing noise entering the ear and improving the clarity of music playback and the voice quality of calls. The noise-canceling microphone 60 can be located between the first speaker 20 and the first sound outlet 12a, enabling more accurate capture of noise within the ear canal. In this position, the noise signal captured by the microphone and the signal emitted by the speaker can be more easily aligned in phase, which is crucial for achieving effective active noise cancellation.

[0074] Please continue reading as follows Figure 3 , Figure 4 and Figure 5 To ensure that the sound outlet 12 moves into place between the first position and the second position, the open-back headphone 100 also includes a detection component 50. The detection component is electrically connected to the circuit board. The detection component 50 is used to detect the position information of the sound outlet 12 relative to the housing 11 and to send the position information to the circuit board, that is, to detect the position of the sound outlet 12.

[0075] The circuit board is used to control the first speaker 20 and the second speaker 30 to work simultaneously when the position information sent by the detection component 50 indicates that the mouthpiece 12 is in a first position, and to control the first speaker 20 to work alone when the position information sent by the detection component 50 indicates that the mouthpiece 12 is in a second position. By processing the received detection signals and adjusting the speaker's operating mode according to the signals, the circuit board embodies the intelligence of the device. It can automatically adjust the audio output according to the user's actual usage scenario, reducing the hassle of manual adjustment.

[0076] Specifically, in the first position, the circuit board can be used to distribute high-frequency signals to the first speaker 20 and mid-frequency and low-frequency signals to the second speaker 30. Because high-frequency sounds have high energy and short wavelengths, they tend to attenuate quickly in open spaces. Therefore, high-frequency signals require a more efficient propagation method. Propagating the high-frequency signal through the first speaker 20 better maintains the clarity of the high frequencies; while the mid-frequency and low-frequency signals propagate through the second speaker 30, allowing for better diffusion in open spaces. In the second position, the circuit board can be used to distribute high-frequency, mid-frequency, and low-frequency signals to the first speaker 20. In this second position, the sound outlet 12 is closer to the ear canal, resulting in a shorter sound propagation path. Furthermore, the ear canal itself has a certain resonance effect on sound propagation. Distributing all frequency bands to the first speaker 20 ensures the focus and consistency of the sound, reduces sound leakage, and enhances the focus and immersion of the sound quality.

[0077] Low frequency refers to 20Hz to 200Hz, mid frequency refers to 200Hz to 2kHz, and high frequency refers to 2kHz to 20kHz. In the design of the open-back headphones 100, based on the characteristics of these frequency bands, the first speaker 20 and the second speaker 30 are designed to specifically process signals of specific frequency bands in order to achieve the best sound quality performance of the open-back headphones 100 in the first position and the second position.

[0078] Specifically, the inspection component includes a detection element 51 and a trigger element (not shown). The detection element 51 is disposed on the housing 11, and the trigger element is disposed on the sound outlet 12. There can be one or two detection elements 51. When there is only one detection element 51, the position of the sound outlet 12 can be determined by the signal change of the detection element 51. When there are two detection elements 51, they can be respectively disposed corresponding to a first position and a second position. This allows the position of the sound outlet 12 to be determined by acquiring signals from different detection elements 51. For example, when the sound outlet 12 is in the first position, the corresponding detection element 51 couples with the trigger element signal to generate a detection signal; and when the sound outlet 12 is in the second position, another corresponding detection element 51 couples with the trigger element signal to generate another detection signal.

[0079] Users can select the open-back headphone wearing mode using physical buttons on the headphones or virtual buttons on the control panel, which automatically adjusts the extension / retraction of the sound outlet 12 relative to the housing 11. For example, when the user selects the in-ear wearing mode, the sound outlet 12 will automatically extend to a preset second position relative to the housing 11; while when the user selects the open-back wearing mode, the sound outlet 12 will automatically retract to a preset first position. During this process, the detection element 51 and the trigger element (not shown) in the detection assembly 50 are used to provide feedback on whether the extension / retraction position of the sound outlet 12 has been reached, ensuring that the extension / retraction action of the sound outlet 12 is accurately completed.

[0080] Understandably, the open-back headphone 100 also includes a digital signal processor (DSP) (not shown) and multiple power amplifiers (PAs) (not shown), the DSP of which can be integrated into the headphone's main control chip. The open-back headphone 100 has built-in first audio parameters and second audio parameters, wherein the first audio parameters correspond to speaker data at a first position, and the second audio parameters correspond to speaker data at a second position.

[0081] In one configuration, the DSP adjusts the operating modes of the first speaker 20 and the second speaker 30 based on the position signal generated by the detection component 50. The PA amplifies the audio signal to sufficient power to drive the corresponding speaker to produce sound. Upon receiving the detection signal for the first position, the DSP determines that the mouthpiece 12 is in the first position. The DSP divides the audio signal into high-frequency and mid-low-frequency components, distributing them to the first speaker 20 and the second speaker 30 respectively. The corresponding PA amplifies the audio signal to sufficient power, driving both speakers to produce sound simultaneously. Upon receiving the detection signal for the second position, the DSP determines that the mouthpiece 12 is in the second position. The DSP distributes the audio signal to the first speaker 20 using second audio parameters, and the PA corresponding to the first speaker 20 amplifies the audio signal to sufficient power, driving the first speaker 20 to produce sound.

[0082] In another configuration, the DSP directly acquires the user's selection via physical buttons or a control panel, thereby adjusting the allocated audio signal to switch the operating modes of the first speaker 20 and the second speaker 30. For example, when the DSP receives a signal from the user selecting the in-ear wearing mode, the sound outlet 12 automatically extends to the second position, and the trigger and detection elements confirm that the extension / retraction position is in place. The DSP then allocates the audio signal to the first speaker 20 according to the second audio parameters, and amplifies the audio signal to sufficient power through the corresponding PA of the first speaker 20 to drive the first speaker 20 to produce sound. At this time, the DSP uses control logic to shut off the audio signal of the second speaker 30, ensuring that only the first speaker 20 works, thus optimizing the sound quality and noise reduction effect in the in-ear wearing mode. Conversely, when the DSP receives a signal from the user selecting the open-ear wearing mode, the sound outlet 12 automatically retracts to the first position. The DSP divides the audio signal into high-frequency and mid-low-frequency parts according to the first audio parameters, and allocates them to the first speaker 20 and the second speaker 30 respectively. The corresponding PA amplifies the audio signal to sufficient power, driving both speakers to produce sound simultaneously, providing the best sound quality performance in the open-ear wearing mode.

[0083] In one configuration, the trigger is fixedly connected to the sound outlet 12 or the first speaker 20. That is, the trigger can be a separate component that can be independently designed and optimized according to specific needs before being connected to the sound outlet 12 or the first speaker 20. If the trigger is damaged or needs to be upgraded, it can be replaced separately without replacing the entire sound outlet 12 or the speaker, thus reducing maintenance costs.

[0084] In another configuration, a portion of the sound outlet 12 or a portion of the first speaker 20 serves as a trigger, reducing the number of components inside the open-back headphone 100, optimizing space utilization, and making the headphones more compact. Furthermore, the trigger does not require separate connection to the sound outlet 12 or the first speaker 20, reducing connection points between components, enhancing the overall structural stability, and reducing the risk of malfunctions due to loose components.

[0085] Specifically, the first loudspeaker 20 includes an auxiliary system, a vibration system, and a magnetic circuit system. The vibration system is located within the auxiliary system and may include the housing and front shell of the first loudspeaker 20. The housing and front shell cooperate to form a protective frame. The vibration system is used to vibrate and generate sound. The vibration system includes a diaphragm and a voice coil. The voice coil can drive the diaphragm to vibrate. The magnetic circuit system is located within the auxiliary system and may include a frame, a magnet, and a washer. The magnetic circuit system can form a stable geomagnetic field. The voice coil will be subjected to electromagnetic force in the magnetic field, thereby driving the diaphragm to vibrate and generate sound. That is, the magnetic circuit system is used to provide driving force for the vibration system.

[0086] Furthermore, as can be seen from the above, the magnetic circuit system can be configured as the aforementioned triggering element, without the need for a separate triggering element.

[0087] like Figure 5 As shown, the housing 11 includes a housing body 111 and a support 112. The housing body 111 has a receiving cavity, and the support 112 is disposed in the receiving cavity. The two sides of the support 112 respectively form a receiving cavity and a sliding cavity. The second speaker 30 is housed in the receiving cavity. The detection element 51 is disposed on the side of the receiving cavity near the sliding cavity. The trigger element is connected to the detection element 51 and extends into the sliding cavity. The sound outlet 12 is slidably disposed in the sliding cavity. The detection element 51 is disposed on the support 112, so that the detection element 51 can monitor the position change of the sound outlet 12 in real time and ensure the accuracy of position detection.

[0088] Specifically, the trigger element can be a magnet, while the detection element 51 can be a Hall sensor. The trigger element (magnet) can be fixed to the sound outlet 12 and move with the extension and retraction of the sound outlet 12. The magnet generates a stable magnetic field. When the sound outlet 12 moves, the distance between the magnet and the Hall sensor changes, and the magnetic field strength changes accordingly. The Hall sensor is a magnetically sensitive element based on the Hall effect. When the magnetic field (generated by the magnet) approaches the Hall sensor, the charge carriers inside the sensor are subjected to the Lorentz force, resulting in a potential difference. This potential difference (Hall voltage) is proportional to the magnetic field strength, so the presence and strength change of the magnetic field can be sensed by detecting the change in the Hall voltage. Of course, in other forms, the detection component 50 can also be in the form of a microswitch or a photoelectric switch; this application does not limit this.

[0089] Please see Figure 6 and Figure 7 In some embodiments of this application, the ear cap 70 is detachably connected to the sound outlet 12 and is sleeved on the outside of the sound outlet 12. The ear cap 70 is provided with a sound outlet 70a that communicates with the first sound outlet 12a, and the ear cap 70 is made of a flexible material, such as silicone. Therefore, combined with the structure that allows the sound outlet 12 to extend and retract relative to the housing 11, users can disassemble and reassemble the ear cap 70 to select a more suitable ear cap 70. For example, when extending the sound outlet 12 to shorten the distance from the sound outlet to the ear canal opening, if the sound outlet 12 has reached its extension limit and the sound leakage is still relatively serious, the ear cap 70 can be disassembled and reassembled to replace it with a larger ear cap 70. This can achieve a tighter seal on the ear canal opening, more effectively isolate external noise, achieve a higher noise reduction effect, and thus improve the listening experience. When retracting the sound outlet 12 to increase the distance from the sound outlet 12 to the ear canal opening, if the user still feels that the area where the sound outlet 12 is located in the ear canal opening is unreasonable and causes discomfort, the ear cap 70 can also be disassembled and reassembled to replace it with a smaller ear cap 70 to further increase the distance from the ear cap 70 to the ear canal opening, improve the adaptability of the open-back headphones 100, and give the user a more comfortable user experience. The above-mentioned configuration enables the open-back headphone 100 of this application to be suitable for users with ears of different sizes and to achieve a better listening experience, thereby meeting the needs of different users.

[0090] Furthermore, the detachable connection between the ear cap 70 and the sound outlet 12 allows the ear cap 70 to be easily removed for cleaning or replacement. This is especially beneficial for users who frequently sweat or use the device in humid environments, helping them maintain the hygiene of the ear cap 70. Additionally, the detachable connection between the ear cap 70 and the sound outlet 12 allows users to easily change to various sizes or types of ear caps 70. Users can choose the appropriate ear cap 70 according to their preferences or ear size, improving wearing comfort and making it convenient to change the ear cap 70 for different usage scenarios.

[0091] 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 undergo a certain degree of deformation and compression. For example, the contact surfaces between the sound outlet 12 and the housing 11 can be made of soft rubber material. In another implementation, a sealing structure 90 can be provided between the sound outlet 12 and the housing 11. That is, the sealing structure 90 itself generates elastic deformation and resistance to prevent the sound outlet 12 from becoming loose relative to the housing 11. The sealing structure 90 can be a damping ring, damping sheet, or other structure made of silicone material.

[0092] For details, please refer to Figure 7 The sealing structure 90 of the open-back headphone 100 can be a sealing ring, made of a damping material such as silicone or rubber. The sealing ring is located on one of the housing 11 and the sound outlet 12, and abuts against the other of the housing 11 and the sound outlet 12. In one embodiment of this application, the sound outlet 12 is nested inside the housing 11, and the sealing ring is sandwiched between the outer walls of the housing 11 and the sound outlet 12. A fixing groove may be provided on the sound outlet 12 or the housing 11, and the sealing ring is embedded and fixed in the fixing groove. The sealing ring also helps to reduce the resonance amplitude generated by the mechanical structure when the sound outlet 12 and the housing 11 transmit sound, thereby preventing structural damage due to vibration stress reaching its limit. Furthermore, the sealing ring sandwiched between the outer walls of the housing 11 and the sound outlet 12 can seal the gap between the outer walls of the housing 11 and the sound outlet 12 caused by relative movement, preventing foreign objects from entering the interior of the open-back headphone 100, affecting the normal operation of the open-back headphone 100, and extending the service life of the open-back headphone 100.

[0093] 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.

[0094] 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, used to wear the open-back headphones on the user's ears; The sound-emitting part includes a housing and a sound outlet. The housing is connected to the wearing part. The sound outlet has a first sound outlet hole. The sound outlet is movably connected to the housing. The sound outlet is retractable relative to the housing so that the distance between the first sound outlet hole and the user's ear canal can be adjusted when the open-back headphones are worn. A first loudspeaker, wherein the first loudspeaker is disposed within the sound outlet; as well as A second speaker is disposed within the housing.

2. The open-back headphone according to claim 1, characterized in that, When the sound outlet is in the first position, the sound outlet is spaced apart from the user's ear canal opening.

3. The open-back headphone according to claim 2, characterized in that, The first sound outlet is located at the front end of the sound outlet; With the sound outlet in the second position, the front end of the sound outlet is inserted into the user's ear canal.

4. The open-back headphone according to claim 3, characterized in that, The sound outlet moves telescopically between a first position and a second position relative to the housing. The open-back headphones also include a circuit board disposed within the housing. The circuit board is used to control the first speaker and the second speaker to work simultaneously when the sound outlet is in the first position, and to control the first speaker to work independently when the sound outlet is in the second position.

5. The open-back headphone according to claim 4, characterized in that, The open-back headphones also include a detection component electrically connected to the circuit board, used to detect the position information of the sound outlet and send the position information to the circuit board; The circuit board is used to control the first speaker and the second speaker to work simultaneously when it receives the position information sent by the detection component indicating that the sound outlet is in the first position, and to control the first speaker to work alone when it receives the position information sent by the detection component indicating that the sound outlet is in the second position.

6. The open-back headphone according to claim 5, characterized in that, The detection component includes a detection element and a trigger element. The detection element is disposed in the housing and electrically connected to the circuit board, and the trigger element is disposed in the sound outlet.

7. The open-back headphone according to claim 1, characterized in that, The housing is fitted over the sound outlet, and a sound outlet channel is defined between the sound outlet and the housing. The side wall of the sound outlet is provided with a sound guide hole, and the housing is provided with a second sound outlet hole. The sound outlet channel connects the sound guide hole and the second sound outlet hole.

8. The open-back headphone according to claim 7, characterized in that, The sound guide hole is positioned closer to the second speaker than the first speaker.

9. The open-back headphone according to claim 7, characterized in that, The housing has an installation port at one end away from the wearing part, and the sound outlet is movably installed at the installation port and can be extended and retracted relative to the housing; the open-back earphone also includes an elastic seal, which is installed at the installation port and elastically abuts against the outer wall of the sound outlet.

10. The open-back headphone according to claim 7, characterized in that, The first speaker divides the space within the sound outlet to form a first sound cavity located behind the first speaker, and the second speaker divides the space within the housing to form a second sound cavity located in front of the second speaker. The first sound cavity and the second sound cavity are connected and together form a coupling sound cavity, which is connected to the sound guide hole.

11. The open-back headphone according to 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.

12. The open-back headphone according to claim 11, characterized in that, The adjustment mechanism includes: piezoelectric vibrators; and A friction element is disposed at the output end of the piezoelectric vibrator and makes transmission contact with the sound outlet, so that the piezoelectric vibrator drives the friction element to move and cause the sound outlet to move along the extension direction; The first speaker has a guide hole, and a portion of the friction element can pass through the guide hole.

13. The open-back headphone according to claim 12, characterized in that, The friction element is a carbon rod; The cross-sectional diameter of the carbon rod is a, and the diameter of the guide hole is b, wherein b satisfies: (0.5mm+a)≤b≤(1.5mm+a).

14. The open-back headphone according to claim 1, characterized in that, Also includes: A noise-canceling microphone is located between the first speaker and the first sound outlet.

15. The open-back headphone according to any one of claims 1-14, characterized in that, Also includes: An ear cap is fitted over the outside of the sound outlet, and the ear cap has a sound-emitting hole that connects the first sound outlet hole with the external environment.

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