earphone

Abstract

This application discloses an earphone, which includes a housing, a speaker, and a control valve. By placing the speaker within a cavity of the housing, the cavity is divided into a front acoustic cavity and a rear acoustic cavity. The front acoustic cavity is connected to the earphone's sound outlet. The control valve is located in an airflow channel within the housing. The front acoustic cavity is connected to a pressure relief hole through the airflow channel. When wearing the earphone, the user can increase the flow area of ​​the airflow space of the control valve, allowing the cavity structure formed between the ear canal and the front acoustic cavity to connect with the outside through the pressure relief hole. This balances the air pressure between the ear canal and the front acoustic cavity with atmospheric pressure, resulting in a pressure-free earphone insertion and improved wearing comfort. When playing music, the user can decrease the flow area of ​​the airflow space, reducing the airflow between the sound outlet and the pressure relief hole. This prevents excessive leakage of low-frequency sounds from the earphone, improves the sound quality, and prevents the pressure relief hole from adversely affecting the sound quality of the earphone.

Description

Technical Field

[0001] This application relates to the field of headphone technology, and in particular to a type of headphone. Background Technology

[0002] Currently, in both over-ear and in-ear headphones, when a user wears the headphones, a sealed cavity structure is formed between the ear canal and the front acoustic chamber. If the air pressure generated by this sealed cavity is too high, it will cause pressure on the eardrum.

[0003] In related technologies, a pressure relief hole structure is usually set between the front and rear acoustic chambers to balance the air pressure changes between the ear canal and the front acoustic chamber. Although the pressure relief hole realizes the release of air pressure, it will affect the low frequency performance of the headphones and have an adverse effect on the sound quality of the headphones. Utility Model Content

[0004] This application provides an earphone that solves the technical problem that the pressure relief hole adversely affects the sound quality of the earphone.

[0005] This application provides an earphone, which includes: The housing has an internal cavity, and the housing is provided with a sound outlet, an airflow channel and at least one pressure relief hole communicating with the cavity. A loudspeaker, wherein the loudspeaker is disposed within the receiving cavity and mounted on the housing, and the loudspeaker divides the receiving cavity into a front sound cavity and a rear sound cavity, the front sound cavity communicating with the sound outlet, and the front sound cavity communicating with the pressure relief hole through the airflow channel; and A control valve is disposed in the airflow channel and installed in the housing, and the control valve has an air guide space communicating with the front sound cavity and the pressure relief hole. The control valve is configured to adjust the flow area of ​​the air guide space to adjust the communication state between the sound outlet and the pressure relief hole.

[0006] The earphone based on this application embodiment has a speaker disposed within the receiving cavity of the earphone housing, dividing the receiving cavity into a front acoustic cavity and a rear acoustic cavity. The front acoustic cavity is connected to the earphone's sound outlet. A control valve is disposed in the airflow channel within the housing and mounted on the housing. The front acoustic cavity is connected to a pressure relief hole via the airflow channel. The control valve has an air guide space and is configured to adjust the flow area of ​​the air guide space to regulate the airflow between the sound outlet and the pressure relief hole. More specifically, when wearing the earphone, the user can increase the flow area of ​​the air guide space, thereby adjusting the airflow between the sound outlet and the pressure relief hole. The increased airflow area allows air to quickly escape from the ear canal and front acoustic chamber through the pressure relief hole, thus balancing the air pressure between the ear canal and front acoustic chamber with atmospheric pressure. This eliminates the pressure sensation when inserting the headphones, improving wearing comfort. When playing music, users can reduce the airflow area between the sound outlet and the pressure relief hole, preventing excessive leakage of low-frequency sounds and improving sound quality. Therefore, while ensuring wearing comfort, it also prevents the pressure relief hole from negatively impacting the sound quality. 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 the earphone provided in the first embodiment of this application; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA; Figure 3 This is a schematic diagram of the internal structure of the earphone provided in the first embodiment of this application; Figure 4 This is a schematic diagram of the structure of the control valve provided in an embodiment of this application; Figure 5 This is a schematic diagram of the control valve in the closed state provided in an embodiment of this application; Figure 6 This is a schematic diagram of the control valve in the open state provided in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the earphone provided in the second embodiment of this application; Figure 8 This is a schematic diagram of the internal structure of the earphone provided in the second embodiment of this application.

[0009] Explanation of icon numbers: 100. Earphone; 10. Housing; 11. Front housing; 111. Sound outlet; 1111. Sound channel; 112. Main housing; 12. Rear housing; 13. Ear cap; 010. Receiving cavity; 0101. Front sound cavity; 0102. Rear sound cavity; 011. Sound outlet; 012. Pressure relief hole; 013. Airflow channel; 14. Annular convex wall; 20. Speaker; 30. Control valve; 31. Valve seat; 311. Air guide space; 32. Valve core; 33. Piezoelectric element; 40. First seal.

[0010] 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

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] In the wave of the digital age, music has become an indispensable part of people's lives. Headphones, as an important medium for music playback, have become one of the most common electronic devices in our daily lives. For in-ear headphones, when a user wears them, a sealed cavity structure is formed between the front sound chamber of the headphone and the ear canal. As the headphones are inserted into the user's ear canal, the air inside the sealed cavity structure is compressed. If the air pressure inside the sealed cavity structure is too high, it will cause pressure on the eardrum.

[0016] In related technologies, a pressure relief hole structure is typically placed between the front and rear acoustic chambers to balance the air pressure changes between the ear canal and the front acoustic chamber. The size of the pressure relief hole is directly proportional to the pressure relief effect between the ear canal and the front acoustic chamber of the headphone; that is, the larger the area, the more significant the pressure relief effect. However, increasing the area of ​​the pressure relief hole is inversely proportional to the low-frequency performance of the headphone, which has an adverse effect on the sound quality of the headphone.

[0017] To resolve the above issues, please refer to [link / reference]. Figures 1 to 3 This application proposes an earphone 100. In this embodiment, the earphone 100 includes a housing 10, a speaker 20, and a control valve 30. The housing 10 has a receiving cavity 010 inside, and the housing 10 is provided with a sound outlet 011, an airflow channel 013, and at least one pressure relief hole 012 communicating with the receiving cavity 010. The speaker 20 can be disposed in the receiving cavity 010 and is mounted on the inner sidewall of the housing 10. The speaker 20 can divide the receiving cavity 010 into a front sound cavity 010. 1. The rear acoustic cavity 0102 and the front acoustic cavity 0101 are connected to the sound outlet 011. The front acoustic cavity 0101 is also connected to the pressure relief hole 012 through the airflow channel 013. The control valve 30 is located in the airflow channel 013 and is installed on the inner side wall of the housing 10. The control valve 30 has an air guide space 311 that is connected to the front acoustic cavity 0101 and the pressure relief hole 012. The control valve 30 is configured to adjust the flow area of ​​the air guide space 311 to adjust the connection state between the sound outlet 011 and the pressure relief hole 012.

[0018] Understandably, the housing 10 serves as the external structure of the earphone 100. The housing 10 not only protects the earphone 100 but also houses the earphone 100's components. The housing 10 has an internal cavity 010 specifically designed for housing various internal components of the earphone 100. The housing 10 also has a sound outlet 011 for transmitting sound, a pressure relief hole 012 to ensure internal pressure balance, and an airflow channel 013 connected to the pressure relief hole 012.

[0019] The speaker 20 is the sound-producing component of the headphone 100. The speaker 20 typically includes components such as a diaphragm, magnet, and voice coil. The speaker 20 divides the housing cavity 010 of the headphone 100 into two spaces: the space in front of the speaker 20 diaphragm is the front acoustic cavity 0101, and the space behind the speaker 20 diaphragm is the rear acoustic cavity 0102. Alternatively, the space on the side of the speaker 20 diaphragm closer to the sound outlet 011 is the front acoustic cavity 0101, and the space on the side of the speaker 20 diaphragm away from the sound outlet 011 is the rear acoustic cavity 0102. The front acoustic cavity 0101 is connected to the sound outlet 011. The front acoustic cavity 0101 is also connected to the pressure relief hole 012 through the airflow channel 013. When the user wears the earphone 100, the part of the housing 10 with the sound outlet 011 will extend into the user's ear canal, and the front acoustic cavity 0101 will form a cavity structure with the ear canal, so that the sound generated by the speaker 20 can be transmitted to the user from the sound outlet 011 through the front acoustic cavity 0101. The rear acoustic cavity 0102 can reduce the back wave interference of the speaker 20.

[0020] The control valve 30 is a miniature valve that combines microelectromechanical systems (MEMS) technology with the control principle of solenoid valves. The control valve 30 is small in size, has a fast response speed, and high control precision. In the embodiment of this application, the control valve 30 is configured to adjust the connection state between the sound outlet 011 and the pressure relief hole 012 by adjusting the flow area of ​​the air guide space 311.

[0021] More specifically, when wearing the headphones 100, the user can increase the flow area of ​​the air duct space 311, allowing the sound outlet 011, front acoustic cavity 0101, airflow channel 013, and pressure relief hole 012 to remain sequentially connected through the air duct space 311. Furthermore, the airflow between the sound outlet 011 and the pressure relief hole 012 will increase, allowing the airflow between the ear canal and the front acoustic cavity 0101 to be quickly discharged to the outside through the pressure relief hole 012. This, in turn, allows the air pressure between the ear canal and the front acoustic cavity 0101 to match the ambient pressure. With balanced air pressure, the earphone 100 is comfortable to wear without any pressure. When playing music, the user can reduce the flow area of ​​the air duct 311, which reduces the airflow between the sound outlet 011 and the pressure relief hole 012. This prevents excessive leakage of low-frequency sound from the earphone 100 and improves the sound quality. Therefore, while ensuring the comfort of wearing the earphone 100, it also prevents the pressure relief hole 012 from adversely affecting the sound quality of the earphone 100.

[0022] It should be noted that when the flow area of ​​the air duct 311 is greater than 0, the control valve 30 is in the open state, and when the flow area of ​​the air duct 311 is equal to 0, the control valve 30 is in the closed state. When the user is wearing the headphones 100, the control valve 30 can be configured to be in the open state, so that the air pressure between the ear canal and the front sound cavity 0101 can be balanced with the atmospheric pressure through the pressure relief hole 012. When the user is playing music, the control valve 30 can be configured to be in the closed state, so that the airflow between the pressure relief hole 012 and the sound outlet 011 is blocked, so that a sealed cavity can be formed between the ear canal and the front sound cavity 0101, which can improve the sound quality of the headphones 100.

[0023] In addition, when the control valve 30 is a miniature valve, the miniature valve itself has high-frequency performance, which can enhance the high-frequency bandwidth of the headphones 100, thereby enhancing the sound effect of the headphones 100. Furthermore, the fast response characteristics of the miniature valve help to capture and reproduce high-frequency details in the audio signal, thereby improving the high-frequency resolution of the headphones 100.

[0024] Please see Figure 3 In some embodiments, the pressure relief hole 012 can communicate with the rear sound cavity 0102, and one end of the airflow channel 013 is connected to the rear sound cavity 0102, and the other end of the airflow channel 013 is connected to the front sound cavity 0101. The control valve 30 is disposed in the airflow channel 013. When the flow area of ​​the air guide space 311 is equal to 0, the control valve 30 seals the airflow channel 013. Alternatively, when the flow area of ​​the air guide space 311 is greater than 0, the front sound cavity 0101 is connected to the rear sound cavity 0102 through the air guide space 311.

[0025] Optionally, the housing 10 defines a pressure relief hole 012 on the side wall of the rear sound cavity 0102, and the pressure relief hole 012 communicates with the rear sound cavity 0102. An airflow channel 013 is provided on the inner wall surface of the housing 10, and the airflow channel 013 communicates with the front sound cavity 0101. The airflow channel 013 extends from the front sound cavity 0101 to communicate with the rear sound cavity 0102. A control valve 30 is set in the airflow channel 013 so that the control valve 30 can open and close the airflow channel 013.

[0026] More specifically, when wearing the headphones 100, the user can configure the control valve 30 to be open, that is, adjust the flow area of ​​the air duct 311 to be greater than 0, so that the front sound cavity 0101 can be connected to the rear sound cavity 0102 through the air duct 311. Thus, the airflow between the front sound cavity 0101 and the ear canal can flow to the rear sound cavity 0102 through the airflow channel 013. The airflow in the rear sound cavity 0102 can be discharged to the outside through the pressure relief hole 012, thereby balancing the air pressure between the front sound cavity 0101 and the ear canal with the atmospheric pressure. The headphones 100 do not put pressure on the eardrum during insertion, which can improve the comfort of wearing the headphones 100.

[0027] When playing music, users can reduce the flow area of ​​the air duct 311 to decrease the leakage of the bass frequency of the headphones 100. Alternatively, the control valve 30 can be configured to be closed, that is, the flow area of ​​the air duct 311 can be adjusted to zero, so that the airflow channel 013 between the front acoustic cavity 0101 and the rear acoustic cavity 0102 is sealed. This allows a relatively sealed cavity structure to be formed between the front acoustic cavity 0101 and the ear canal. The airtightness helps to reduce the interference of external noise, improves the purity and immersion of the sound, and reduces sound leakage and scattering, improving the efficiency of sound transmission. This allows the sound generated by the speaker 20 to be transmitted more concentratedly from the sound outlet 011 to the ear canal.

[0028] In some other embodiments, air can circulate naturally inside and outside the earphone 100 by providing an open mesh, breathable mesh fabric, or holes of a specific shape in the housing 10, thereby maintaining the air pressure balance inside the earphone 100. Alternatively, an elastic diaphragm can be integrated inside the earphone 100; when the air pressure changes, the diaphragm deforms to achieve air pressure balance inside the earphone 100. Furthermore, a pressure sensor built into the earphone 100 can monitor air pressure changes in real time, and a micro-motor or pump can actively adjust the air pressure inside the earphone 100.

[0029] Please see Figures 3 to 6 In some embodiments, the control valve 30 includes a valve seat 31, a valve core 32, and a piezoelectric element 33. The valve seat 31 can be disposed in the airflow channel 013 and has an air guiding space 311. The valve core 32 can be disposed in the air guiding space 311 and is movably connected to the valve seat 31. The piezoelectric element 33 is drivenly connected to the valve core 32. The piezoelectric element 33 can drive the valve core 32 to move relative to the valve seat 31 to adjust the flow area of ​​the air guiding space 311.

[0030] Optionally, the valve seat 31 can be square, cylindrical, or other shapes. The specific shape of the valve seat 31 is not limited. The valve seat 31 is the basic component of the control valve 30. The valve seat 31 is used to support and position the valve core 32. The valve seat 31 has an air guide space 311, which can be a circular hole. The axial direction of the air guide space 311 can be the same as the extension direction of the air flow channel 013, so as to facilitate the placement of the valve seat 31 in the air flow channel 013.

[0031] The valve core 32 is a moving part in the control valve 30. The valve core 32 may include a first part and a second part. The first part and the second part are arranged in a direction perpendicular to the axial direction of the air guide space 311, and the first part and the second part are located on opposite sides of the axis of the air guide space 311. Both the first part and the second part are connected to the piezoelectric element 33 for transmission. The piezoelectric element 33 can convert electrical energy into mechanical energy, thereby driving the valve core 32 to move to open and close the air guide space 311.

[0032] Specifically, when the piezoelectric element 33 is excited by voltage, the piezoelectric element 33 will undergo a slight deformation (such as elongation or shortening). This deformation can be transmitted to the first part and the second part of the valve core 32, causing the first part and the second part to move towards each other, thereby reducing the flow area of ​​the air guide space 311 until the first part and the second part cover the air guide space 311, thereby blocking the airflow channel 013. At this time, the control valve 30 is in the closed state.

[0033] Conversely, when the excitation voltage of the piezoelectric element 33 is reversed or removed, the piezoelectric element 33 returns to its original state, and the first and second parts of the valve core 32 also move away from each other, which can open the air guide space 311, making the flow area of ​​the air guide space 311 larger, thereby opening the airflow channel 013. At this time, the control valve 30 is in the open state, which can connect the front sound cavity 0101 and the rear sound cavity 0102.

[0034] Therefore, precise control of the position of the valve core 32 and the opening and closing state of the air guide space 311 can be achieved by precisely controlling the magnitude and direction of the voltage. Specifically, the valve core 32 is driven to move relative to the air guide space 311 by the slight deformation of the piezoelectric element 33, so as to adjust the flow area of ​​the air guide space 311 and realize the opening and closing of the air guide space 311. This allows the control valve 30 to be designed to be very small, making it easy to assemble the control valve 30 into the earphone 100.

[0035] Please see Figure 3 In some embodiments, an airflow channel 013 is formed between the speaker 20 and the housing 10, and the airflow channel 013 is located on one side of the speaker 20 in a direction perpendicular to the sound output direction of the speaker 20. A control valve 30 is disposed at one end of the airflow channel 013 that communicates with the rear acoustic cavity 0102, and one part of the control valve 30 is connected to the speaker 20 and the other part is connected to the housing 10, so that the control valve 30 is used to open and close the airflow channel 013.

[0036] In this embodiment, the sound output direction of the speaker 20 refers to the main direction in which the speaker 20 emits sound, which is usually also the direction in which the diaphragm of the speaker 20 vibrates. The inner sidewall of the housing 10 is provided with a groove, and the sidewall of the speaker 20 arranged around its sound output direction can cover the groove opening, so that an airflow channel 013 can be formed between the speaker 20 and the housing 10. Furthermore, in the direction perpendicular to the sound output direction of the speaker 20, the airflow channel 013 is located on one side of the speaker 20, so that the airflow channel 013 will not interfere with the sound output of the speaker 20.

[0037] The control valve 30 can be installed between the speaker 20 and the housing 10, and the control valve 30 and the airflow channel 013 are located on the same side of the speaker 20, so that the control valve 30 and the speaker 20 together divide the housing 010 into the front sound cavity 0101 and the rear sound cavity 0102. The control valve 30 covers the opening of the airflow channel 013, so that the control valve 30 can open and close the airflow channel 013. Thus, the airflow channel 013 does not need to extend into the rear sound cavity 0102, which can reduce the length of the airflow channel 013 and increase the space utilization of the housing 010.

[0038] Please see Figure 2 In some embodiments, the earphone 100 further includes a first seal 40, a portion of which seals the gap between the speaker 20 and the housing 10, another portion of which seals the gap between the control valve 30 and the housing 10, and the remaining portion of which seals the gap between the control valve 30 and the speaker 20.

[0039] Optionally, a sealant can be used to seal and form a first seal 40. The sealant can be applied in dots or applied to the back. The sealant can be used to fill the gap between the speaker 20 and the housing 10 to form a part of the first seal 40. This first seal 40 can provide sufficient adhesive force to fix the speaker 20 to the inner wall of the housing 10, preventing the speaker 20 from loosening or shifting during use, thereby ensuring the stability and consistency of the sound output. In addition, it can also form a sound barrier between the speaker 20 and the housing 10, which can reduce the leakage of sound from the rear of the speaker 20 (the part of the speaker 20 near the rear acoustic cavity 0102) to the external space, thereby improving the sound radiation efficiency and clarity.

[0040] Another part of the first seal 40 can be formed by filling the gap between the control valve 30 and the housing 10 with sealant, and the remaining part of the first seal 40 can be formed by filling the gap between the control valve 30 and the speaker 20 with sealant. This can fix the control valve 30 at the opening of the airflow channel 013, prevent the control valve 30 from loosening, and enable the control valve 30 to stably open and close the airflow channel 013.

[0041] Please see Figure 3 In some embodiments, the pressure relief hole 012 and the airflow channel 013 are respectively located on opposite sides of the sound outlet 011 in a direction perpendicular to the sound output direction of the speaker 20.

[0042] Optionally, in a direction perpendicular to the sound output direction of the speaker 20, the pressure relief hole 012 is located above the sound outlet 011, and the airflow channel 013 is located below the sound outlet 011. This can prevent mutual interference between the pressure relief hole 012 and the airflow channel 013. For example, if the pressure relief hole 012 and the airflow channel 013 are located on the same side, the pressure relief hole 012 and the airflow channel 013 will affect each other, resulting in sound distortion or air pressure imbalance problems.

[0043] Please see Figure 7 and Figure 8 In some embodiments, the pressure relief hole 012 and the airflow channel 013 are both located on the side of the speaker 20 facing the sound outlet 011. The pressure relief hole 012 is connected to the front sound cavity 0101. The control valve 30 is disposed in the airflow channel 013 and located at the pressure relief hole 012. When the flow area of ​​the air guide space 311 is equal to 0, the control valve 30 closes the airflow channel 013 and the pressure relief hole 012. Alternatively, when the flow area of ​​the air guide space 311 is greater than 0, the front sound cavity 0101 is connected to the pressure relief hole 012 through the air guide space 311.

[0044] In this embodiment, the housing 10 defines a receiving cavity 010, the speaker 20 is disposed in the receiving cavity 010, and the speaker 20 is connected to the inner wall surface of the housing 10. The speaker 20 divides the receiving cavity 010 into a front sound cavity 0101 and a rear sound cavity 0102. The side wall defining the front sound cavity 0101 is provided with a pressure relief hole 012 and an airflow channel 013. The pressure relief hole 012 is connected to the front sound cavity 0101 through the airflow channel 013.

[0045] When wearing the headphones 100, the user can adjust the flow area of ​​the air space 311 to be greater than 0, so that the front sound cavity 0101 can be connected to the outside through the pressure relief hole 012. Thus, the cavity structure formed between the ear canal and the front sound cavity 0101 can be connected to the outside through the pressure relief hole 012. As a result, the air pressure between the ear canal and the front sound cavity 0101 can be balanced with the atmospheric pressure, so there is no pressure when the headphones 100 are inserted into the ear, which can improve the comfort of wearing the headphones 100.

[0046] When playing music, the user can reduce the flow area of ​​the air vent 311, thus reducing the airflow area between the sound outlet 011 and the pressure relief hole 012. This prevents excessive leakage of low-frequency sound from the headphones 100 and improves the sound quality of the headphones 100. Alternatively, the control valve 30 can be configured to be closed, adjusting the flow area of ​​the air vent 311 to zero. This blocks the airflow between the front acoustic cavity 0101 and the outside of the headphones 100, creating a sealed cavity between the ear canal and the front acoustic cavity 0101. This improves the sound quality of the headphones 100 and prevents the pressure relief hole 012 from negatively impacting the sound quality of the headphones 100.

[0047] Please see Figure 8 In some embodiments, the inner wall of the housing 10 is provided with an annular convex wall 14, which extends around the pressure relief hole to form an airflow channel 013. The control valve 30 is disposed in the airflow channel 013, and the surface of the control valve 30 is sealed to the annular convex wall 14.

[0048] In this embodiment, a portion of the inner wall of the housing 10 has an inwardly protruding annular convex wall 14. The annular convex wall 14 extends around the pressure relief hole 012, and the spatial dimension of the airflow channel 013 formed by the annular convex wall 14 is larger than the volume of the control valve 30, so that the control valve 30 can be set in the airflow channel 013. The annular convex wall 14 can limit the control valve 30, prevent the control valve 30 from becoming loose, and the control valve 30 can cover the pressure relief hole 012.

[0049] Furthermore, to facilitate the installation of the control valve 30, sealant can be filled between the surface of the control valve 30 and the annular convex wall 14, so that the control valve 30 and the annular convex wall 14 can form a sealed connection, thereby enabling the control valve 30 to better open and close the pressure relief hole 012. The sealant has adhesive force and can also increase the stability of the control valve 30.

[0050] Please see Figure 8 In some embodiments, the control valve 30 is located close to the speaker 20, and the axial direction of the pressure relief port 012 is set at an angle to the sound output direction of the speaker 20.

[0051] Optionally, the piezoelectric element 33 of the control valve 30 has high-frequency performance. By placing the control valve 30 close to the speaker 20, the vibration of the piezoelectric element 33 can be superimposed with the vibration of the speaker 20, thereby enhancing the high-frequency bandwidth of the headphones 100 and thus enhancing the sound effect of the headphones 100. Furthermore, the fast response characteristics of the piezoelectric element 33 help to capture and reproduce high-frequency details in the audio signal, thereby improving the high-frequency resolution of the headphones 100. In addition, setting the axial direction of the pressure relief hole 012 at an angle to the sound output direction of the speaker 20 reduces unnecessary sound leakage and improves the clarity and purity of the sound.

[0052] Please see Figure 1 and Figure 3 In some embodiments, the housing 10 includes a front housing 11 and a rear housing 12. The front housing 11 includes an integrally formed sound outlet 111 and a main housing 112. The sound outlet 111 has a sound outlet channel 1111. The rear housing 12 is installed on the main housing 112, and the main housing 112 and the rear housing 12 enclose a receiving cavity 010. The sound outlet channel 1111 communicates with the receiving cavity 010. The extending direction of the sound outlet channel 1111 is parallel to the sound outlet direction of the speaker 20. The earphone 100 also includes an ear cap 13, which is installed on the sound outlet 111.

[0053] Optionally, the main housing 112 can be connected to the rear housing 12 to define a receiving cavity 010. The speaker 20 can be disposed in the receiving cavity 010 and mounted on the inner sidewall of the main housing 112. The speaker 20 divides the receiving cavity 010 into a front sound cavity 0101 and a rear sound cavity 0102. More specifically, a portion of the inner sidewall of the main housing 112 and the front portion of the speaker 20 (the portion of the speaker 20 near the sound outlet 111) define the front sound cavity 0101. The rear housing 12, another portion of the inner sidewall of the main housing 112, and the rear portion of the speaker 20 (the portion of the speaker 20 away from the sound outlet 111) define the rear sound cavity 0102.

[0054] It is understandable that sound travels mainly in a straight line in the air. When the extension direction of the sound output channel 1111 is parallel to the sound output direction of the speaker 20, the sound can travel efficiently along this straight line, reducing energy loss caused by directional deviation, thereby reducing distortion and maintaining the original quality of the sound.

[0055] The ear cap 13 can fit snugly into the ear canal, reducing the loosening or slippage of the earphone 100 during wear, improving wearing stability, and also reducing the pressure of the earphone 100 on the ear canal, further improving wearing comfort. The ear cap 13 can also increase the seal between the earphone 100 and the front sound cavity 0101, reducing the possibility of sound leakage from the outside of the earphone 100, making the sound more focused and the sound quality purer.

[0056] In some embodiments, the control valve 30 can be a microcomputer-controlled valve or a microcomputer-controlled piezoelectric valve. Both microcomputer-controlled valves and microcomputer-controlled piezoelectric valves have the characteristics of miniaturization and integration, and can be integrated into the earphone 100. Furthermore, the opening and closing of the airflow channel 013 can be controlled through miniaturization design.

[0057] Specifically, the microprocessor-controlled piezoelectric valve can utilize the inverse piezoelectric effect of piezoelectric materials to produce mechanical deformation under the action of an electric field, thereby adjusting the flow area of ​​the airflow channel 013. In the headphones 100, it can be used to precisely adjust the air pressure balance, improve wearing comfort, and may also have a positive impact on sound quality.

[0058] 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," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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 accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0059] 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 earphone, characterized in that, include: The housing has an internal cavity, and the housing is provided with a sound outlet, an airflow channel and at least one pressure relief hole communicating with the cavity. A loudspeaker, wherein the loudspeaker is disposed within the receiving cavity and mounted on the housing, and the loudspeaker divides the receiving cavity into a front sound cavity and a rear sound cavity, the front sound cavity communicating with the sound outlet, and the front sound cavity communicating with the pressure relief hole through the airflow channel; and A control valve is disposed in the airflow channel and installed in the housing, and the control valve has an air guide space communicating with the front sound cavity and the pressure relief hole. The control valve is configured to adjust the flow area of ​​the air guide space to adjust the communication state between the sound outlet and the pressure relief hole.

2. The earphone of claim 1, wherein The pressure relief hole is connected to the rear acoustic cavity, one end of the airflow channel is connected to the rear acoustic cavity, the other end of the airflow channel is connected to the front acoustic cavity, and the control valve is located in the airflow channel.

3. The earphone of claim 2, wherein The control valve includes: A valve seat, wherein the valve seat is disposed in the airflow channel and the valve seat has the air guiding space; A valve core is disposed in the air guide space and is movably connected to the valve seat; A piezoelectric element is drivenly connected to the valve core, and the piezoelectric element is used to drive the valve core to move relative to the valve seat in order to adjust the flow area of ​​the air guide space.

4. The headphones as described in claim 2, characterized in that: The airflow channel is formed between the speaker and the housing, and the airflow channel is located on one side of the speaker in a direction perpendicular to the sound output direction of the speaker; The control valve is located at one end of the airflow channel that communicates with the rear acoustic cavity, and one part of the control valve is connected to the speaker and the other part is connected to the housing.

5. The earphone of claim 2, wherein In a direction perpendicular to the sound output direction of the speaker, the pressure relief hole and the airflow channel are located on opposite sides of the sound outlet.

6. The earphone of claim 1, wherein The pressure relief hole and the airflow channel are both located on the side of the speaker facing the sound outlet. The pressure relief hole is connected to the front sound cavity. The control valve is located in the airflow channel and at the pressure relief hole.

7. The earphone of claim 6, wherein The inner wall of the housing is provided with an annular convex wall, which extends around the pressure relief hole to form the airflow channel. The control valve is disposed in the airflow channel and is sealed to the annular convex wall.

8. The earphone of claim 6, wherein The control valve is located close to the speaker, and the axial direction of the pressure relief hole is set at an angle to the sound output direction of the speaker.

9. The earphone of claim 1, wherein The housing includes: The front shell includes an integrally formed sound outlet and a main shell, wherein the sound outlet has a sound outlet channel; The rear shell is installed on the main shell, and the main shell and the rear shell together form a receiving cavity. The sound outlet channel communicates with the receiving cavity, and the extending direction of the sound outlet channel is parallel to the sound outlet direction of the speaker.

10. The earphone of claim 1, wherein The control valve is a microcomputer-controlled valve or a microcomputer-controlled piezoelectric valve.

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