Earphone and earphone assembly

Abstract

The earphone comprises a shell and a machine core, the shell is provided with a sound outlet hole, a first pressure relief hole and a second pressure relief hole, the sound outlet hole is located in one side of the shell, the first pressure relief hole and the second pressure relief hole are located in the other two sides of the shell respectively, and when the sound outlet hole sounds towards an auditory meatus opening, the first pressure relief hole and the second pressure relief hole are located in the other two sides of the shell respectively. The first pressure relief hole and the second pressure relief hole are arranged in the direction away from the auditory meatus opening, sound leakage of the first pressure relief hole and the second pressure relief hole can be prevented from interfering with sound production of the sound outlet hole, the movement comprises a first loudspeaker and a second loudspeaker, the first loudspeaker is arranged opposite to the sound outlet hole, and the second loudspeaker is arranged opposite to the sound outlet hole. The second loudspeaker is arranged at one side, deviating from the sound outlet hole, of the first loudspeaker at an interval and forms a rear sound cavity of the first loudspeaker together, and the rear sound cavity can be communicated with the first pressure relief hole and the second pressure relief hole, so that air can freely enter and exit the rear sound cavity through the first pressure relief hole and the second pressure relief hole, and the air in the earphone flows more smoothly; and the sound quality of the earphone is improved.

Description

Technical Field

[0001] This application relates to the field of sound-producing device technology, and more particularly to an earphone and an earphone assembly. Background Technology

[0002] In the field of audio output devices, headphones are a common personal audio playback device, widely popular due to their portability and privacy.

[0003] In related technologies, headphones contain internal speakers that drive air vibrations to produce low-frequency sounds. However, in low-frequency vibration scenarios, if the airflow inside the headphones is not smooth, it may cause unnecessary pressure on the speaker diaphragm, thereby affecting the clarity of the sound and the low-frequency performance. Utility Model Content

[0004] This application provides an earphone and an earphone assembly that can solve the technical problem of poor low-frequency performance of earphones.

[0005] In a first aspect, embodiments of this application provide an earphone, which includes:

[0006] A housing, the housing having a sound outlet, a first pressure relief hole, and a second pressure relief hole, the sound outlet being located on one side of the housing, and the first and second pressure relief holes being located on the other two sides of the housing, respectively; and

[0007] A movement, the movement being disposed within the housing, and the movement comprising:

[0008] A first loudspeaker, wherein the first loudspeaker is disposed opposite to the sound outlet;

[0009] The second speaker is disposed on the side of the first speaker away from the sound outlet. The second speaker is spaced apart from the first speaker and together form the rear sound cavity of the first speaker. Both the first pressure relief hole and the second pressure relief hole are connected to the rear sound cavity.

[0010] In some embodiments, the first pressure relief hole and the second pressure relief hole are located on opposite sides of the sound outlet hole.

[0011] In some embodiments, the centerlines of the first pressure relief hole and the second pressure relief hole coincide.

[0012] In some embodiments, the areas of the first pressure relief hole and the second pressure relief hole are equal.

[0013] In some embodiments, both the first pressure relief hole and the second pressure relief hole are oblong in shape.

[0014] In some embodiments, both the first pressure relief hole and the second pressure relief hole are provided with a tuning component, the tuning component comprising:

[0015] A tuning mesh, which covers the first pressure relief hole or the second pressure relief hole;

[0016] A first connecting layer is connected between the tuning mesh and the housing.

[0017] In some embodiments, the tuning component includes:

[0018] A protective net, which covers the tuning net;

[0019] The second connecting layer is connected between the protective mesh and the tuning mesh.

[0020] In some embodiments, the tuning assembly includes a protective mesh, and the side of the housing is provided with a mounting groove, the mounting groove surrounding the periphery of the first pressure relief hole or the second pressure relief hole, and the protective mesh is at least partially inserted into the mounting groove and covers the tuning mesh.

[0021] In some embodiments, the protective net includes a mesh surface and a limiting folded edge disposed around the periphery of the mesh surface. The mesh surface has a plurality of mesh holes, and the limiting folded edge is inserted into the mounting groove and fixed to the mounting groove by ultrasonic welding.

[0022] In some embodiments, the mounting groove has a first mating surface facing the mesh surface, the mesh surface having an inner surface facing the housing and an outer surface facing away from the housing, the inner surface including a second mating surface and the second mating surface being attached to the first mating surface, and the outer surface and the inner surface being non-axisymmetric curved surfaces that are consistent with each other.

[0023] In some embodiments, the mechanism further includes a bracket disposed between the first speaker and the second speaker. The bracket is used to support at least the second speaker, and the bracket, together with the first speaker and the second speaker, forms the rear acoustic cavity. A channel is formed between the bracket and the first speaker, and the channel connects the first pressure relief hole, the second pressure relief hole and the rear acoustic cavity.

[0024] In some embodiments, both the first speaker and the second speaker are positioned facing the sound outlet.

[0025] In some embodiments, the output frequency of the first speaker is higher than that of the second speaker.

[0026] Secondly, embodiments of this application provide an earphone assembly, which includes a charging case and earphones as described above, wherein the charging case is used to house the earphones so as to charge the earphones.

[0027] The earphones and earphone components based on the embodiments of this application have at least the following beneficial effects:

[0028] By setting a sound outlet, a first pressure relief hole, and a second pressure relief hole on the earphone shell, with the sound outlet located on one side of the shell and the first and second pressure relief holes located on the other two sides of the shell, the phases of the sounds output to the outside of the earphone through the sound outlet, the first pressure relief hole, and the second pressure relief hole are opposite. Thus, when the sound outlet emits sound towards the ear canal, the first and second pressure relief holes are oriented away from the ear canal, which can prevent the sound leakage from the first and second pressure relief holes from interfering with the sound output of the sound outlet, and can also cancel out the phases in the far field away from the ear, thereby reducing sound leakage.

[0029] The housing also contains a mechanism, which includes a first speaker and a second speaker. The first speaker is positioned opposite the sound outlet, and the second speaker is positioned on the side of the first speaker away from the sound outlet. The second speaker and the first speaker are spaced apart to form the rear acoustic chamber of the first speaker. The rear acoustic chamber can communicate with the first pressure relief hole and the second pressure relief hole, allowing air to freely enter and exit the rear acoustic chamber through the first pressure relief hole and the second pressure relief hole. This makes the air flow inside the headphones smoother and helps improve the sound quality of the headphones. Attached Figure Description

[0030] 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 these drawings without creative effort.

[0031] Figure 1 This is a three-dimensional structural diagram of an earphone provided in an embodiment of this application;

[0032] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0033] Figure 3 for Figure 2 Enlarged structural diagram at point B;

[0034] Figure 4 A three-dimensional structural schematic diagram of the protective net provided in the embodiments of this application from a first perspective;

[0035] Figure 5A three-dimensional structural schematic diagram of the protective netting provided in an embodiment of this application from a second perspective;

[0036] Figure 6 This is a three-dimensional structural diagram of the housing provided in an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100. Earphone; 1. Shell; 11. Sound outlet; 12. First pressure relief hole; 13. Second pressure relief hole; 14. Mounting slot; 141. First mating surface; 2. Mechanism; 21. First speaker; 210. Rear sound chamber; 22. Second speaker; 23. Bracket; 231. Channel; 3. Tuning assembly; 31. Tuning mesh; 32. First connecting layer; 33. Protective mesh; 331. Mesh surface; 3311. Second mating surface; 332. Limiting fold; 333. Mesh opening; 34. Second connecting layer. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0040] Please see Figure 1 and Figure 2 This application provides an embodiment of an earphone 100, which includes a housing 1 and a mechanism 2. The housing 1 has a sound outlet 11, a first pressure relief hole 12, and a second pressure relief hole 13. The sound outlet 11 is located on one side of the housing 1, and the first pressure relief hole 12 and the second pressure relief hole 13 are located on the other two sides of the housing 1, respectively. The mechanism 2 is disposed inside the housing 1 and includes a first speaker 21 and a second speaker 22. The first speaker 21 is disposed opposite to the sound outlet 11, and the second speaker 22 is disposed on the side of the first speaker 21 away from the sound outlet 11. The second speaker 22 and the first speaker 21 are spaced apart, and the first speaker 21 and the second speaker 22 together form the rear acoustic cavity 210 of the first speaker 21. The first pressure relief hole 12 and the second pressure relief hole 13 are both connected to the rear acoustic cavity 210.

[0041] Optionally, a sound outlet 11 can be provided on one side of the housing 1, and a first pressure relief hole 12 and a second pressure relief hole 13 can be provided on the other two sides of the housing 1, so that the sound outlet 11, the first pressure relief hole 12 and the second pressure relief hole 13 are located on different sides of the housing 1. When the earphone 100 is worn on the human ear, the sound outlet 11 will be set towards the ear canal opening, which can facilitate the user to hear the sound. The first pressure relief hole 12 and the second pressure relief hole 13 will be set towards the direction away from the ear canal opening, or in other words, the first pressure relief hole 12 and the second pressure relief hole 13 will be set towards the direction away from the ear canal opening, so that the sound output from the sound outlet 11, the first pressure relief hole 12 and the second pressure relief hole 13 to the outside of the earphone 100 is out of phase, which can prevent the sound leakage of the first pressure relief hole 12 and the second pressure relief hole 13 from interfering with the sound output of the sound outlet 11, and can also cancel out in the far field away from the ear to reduce sound leakage.

[0042] The first speaker 21 of the mechanism 2 is positioned opposite to the sound outlet 11, allowing the sound waves generated by the vibration of the first speaker 21 to be emitted to the outside of the earphone 100 through the sound outlet 11. The second speaker 22 is positioned on the side of the first speaker 21 away from the sound outlet 11, and together they form the rear acoustic cavity 210 of the first speaker 21. The sound waves generated by the vibration of the second speaker 22 can cancel each other out with certain noise sound waves generated by the first speaker 21 in the rear acoustic cavity 210, thereby reducing the noise of the earphone 100 and making the sound emitted by the earphone 100 purer and clearer. In addition, the rear acoustic cavity 210 can communicate with the first pressure relief hole 12 and the second pressure relief hole 13, allowing air to freely enter and exit the rear acoustic cavity 210 through the first pressure relief hole 12 and the second pressure relief hole 13. This allows for smoother airflow inside the earphone 100, which is beneficial for improving the sound quality of the earphone 100. Furthermore, smoother airflow reduces the reflection and standing wave phenomena of sound waves in the rear acoustic cavity 210, thereby reducing the noise generated.

[0043] Please see Figure 2 In some embodiments, the first pressure relief hole 12 and the second pressure relief hole 13 are located on opposite sides of the sound outlet hole 11.

[0044] Optionally, the housing 1 has a sound-emitting surface with a sound-emitting hole 11. A first side and a second side are connected to opposite sides of the sound-emitting surface. A first pressure relief hole 12 is provided on the first side and a second pressure relief hole 13 is provided on the second side. The first pressure relief hole 12 and the second pressure relief hole 13 are located on opposite sides of the sound-emitting hole 11, thereby keeping the first pressure relief hole 12 and the second pressure relief hole 13 as far away from the sound-emitting hole 11 as possible. The sound leaked from the first pressure relief hole 12 and the second pressure relief hole 13, as well as the sound output from the sound-emitting hole 11, are directed in different directions, which can prevent the sound output from the first pressure relief hole 12 and the second pressure relief hole 13 from interfering with the sound output from the sound-emitting hole 11.

[0045] Please see Figure 2 In some embodiments, the centerlines of the first pressure relief hole 12 and the second pressure relief hole 13 coincide.

[0046] Optionally, the first pressure relief hole 12 and the second pressure relief hole 13 are located on opposite sides of the rear acoustic cavity 210, and are directly opposite each other, thus forming an airflow channel 231 between them. When the air pressure inside the rear acoustic cavity 210 changes, air can convect through the first pressure relief hole 12 and the second pressure relief hole 13, thereby balancing the air pressure and reducing acoustic distortion caused by air pressure changes, thus improving the sound quality of the headphones 100. In addition, the convection formed by the first pressure relief hole 12 and the second pressure relief hole 13 allows the air inside the rear acoustic cavity 210 to flow more smoothly. Smooth airflow can reduce airflow noise and further improve sound quality.

[0047] Further, please refer to Figure 1 and Figure 2 In some embodiments, the areas of the first pressure relief hole 12 and the second pressure relief hole 13 are equal.

[0048] Optionally, the first pressure relief hole 12 and the second pressure relief hole 13, with equal areas, allow for a more uniform distribution of airflow as it passes through the rear acoustic cavity 210. This reduces turbulence and eddies in the airflow, thereby lowering airflow noise, improving sound quality, and more effectively balancing the air pressure within the rear acoustic cavity 210. In cases of rapid air pressure changes, such as rapid vibration of the diaphragm of the first speaker 21, the air pressure can be evenly balanced through the first pressure relief hole 12 and the second pressure relief hole 13, thus reducing acoustic distortion caused by air pressure imbalance. Furthermore, since the first pressure relief hole 12 and the second pressure relief hole 13 are the same size, they can be manufactured using the same molds or tools, thereby reducing production costs and time.

[0049] Please see Figures 1 to 3 In some embodiments, a tuning component 3 is provided at both the first pressure relief hole 12 and the second pressure relief hole 13. The tuning component 3 includes a tuning mesh 31 and a first connecting layer 32. The tuning mesh 31 covers the first pressure relief hole 12 or the second pressure relief hole 13, and the first connecting layer 32 connects the tuning mesh 31 and the housing 1.

[0050] Optionally, the tuning mesh 31 is typically made of a fine mesh material, and the first connecting layer 32 is an adhesive layer. The first connecting layer 32 can fix the tuning mesh 31 to the housing 1, so that the tuning mesh 31 can cover the first pressure relief hole 12 or the second pressure relief hole 13. The tuning mesh 31 can control the airflow through the first pressure relief hole 12 and the second pressure relief hole 13, thereby balancing the air pressure in the rear acoustic cavity 210, reducing acoustic distortion caused by air pressure changes, improving the stability and durability of the headphones 100, and the tuning mesh 31 can also prevent dust and foreign objects from entering the interior of the housing 1, protecting the internal components of the headphones 100 from damage and extending the service life of the headphones 100.

[0051] Understandably, the aperture and arrangement of the tuning mesh 31 should be designed and adjusted according to the specific needs of the headphones 100. A smaller aperture tuning mesh 31 can provide a more refined tuning effect, but may increase airflow resistance; a larger aperture tuning mesh 31 can provide smoother airflow, but may reduce tuning accuracy.

[0052] It should be noted that the first connecting layer 32 is located on the outer periphery of the first pressure relief hole 12 or the second pressure relief hole 13, so that the first connecting layer 32 will not block the flow surface of the first pressure relief hole 12 or the second pressure relief hole 13, thereby allowing air to pass freely through the first pressure relief hole 12 and the second pressure relief hole 13 without being obstructed by the first connecting layer 32.

[0053] Please see Figure 3 In some embodiments, the tuning assembly 3 may include a protective mesh 33 and a second connecting layer 34, the protective mesh 33 covering the tuning mesh 31, and the second connecting layer 34 connecting the protective mesh 33 and the tuning mesh 31.

[0054] Optionally, the protective net 33 can be made of steel, giving it high strength, enabling it to withstand greater impact and pressure, and preventing deformation or breakage. The protective net 33 can cover the tuning net 31, protecting it from dust, dirt, and other impurities. It also maintains stability when subjected to external forces, protecting the tuning net 31 from damage caused by external impacts.

[0055] The second connecting layer 34 can be disposed between the protective mesh 33 and the tuning mesh 31. Like the first connecting layer 32, the second connecting layer 34 is an adhesive layer. The second connecting layer 34 can fix the protective mesh 33 and the tuning mesh 31, allowing the protective mesh 33 to stably protect the tuning mesh 31. It should be noted that the second connecting layer 34 is also located on the outer periphery of the first pressure relief hole 12 or the second pressure relief hole 13, ensuring that the second connecting layer 34 does not obstruct the flow surface of the first pressure relief hole 12 or the second pressure relief hole 13.

[0056] Please see Figure 3 In some embodiments, the tuning assembly 3 includes a protective mesh 33, and the side of the housing 1 is provided with a mounting groove 14. The mounting groove 14 surrounds the periphery of the first pressure relief hole 12 or the second pressure relief hole 13. The protective mesh 33 is at least partially inserted into the mounting groove 14 and covers the tuning mesh 31.

[0057] Optionally, the housing 1 has a mounting groove 14 on the side with the first pressure relief hole 12 or the second pressure relief hole 13, and the mounting groove 14 can be arranged around the periphery of the first pressure relief hole 12 or the second pressure relief hole 13. The protective net 33 is at least partially inserted into the mounting groove 14. Preferably, the protective net 33 can be ultrasonically welded to the mounting groove 14 so that the protective net 33 can cover the tuning net 31. The protective net 33 can play the role of protecting the tuning net 31, which will not be elaborated here.

[0058] Please see Figures 3 to 6 In some embodiments, the protective net 33 may include a mesh surface 331 and a limiting fold 332 disposed around the periphery of the mesh surface 331. The mesh surface 331 has a plurality of mesh holes 333. The limiting fold 332 is inserted into the mounting groove 14 and is ultrasonically welded to the mounting groove 14.

[0059] Optionally, the limiting fold 332 is arranged around the periphery of the mesh surface 331 and is perpendicular to the mesh surface 331. The mesh surface 331 is an arc-shaped plate, and multiple mesh holes 333 penetrate the inner and outer surfaces of the mesh surface 331. When installing the protective net 33, the protective net 33 is inserted into the first pressure relief hole 12 or the second pressure relief hole 13, so that the annular limiting fold 332 of the protective net 33 is inserted into the annular mounting groove 14 on the outer shell. Then, the limiting fold 332 can be fixed in the mounting groove 14 by ultrasonic welding, so that the protective net 33 is installed more stably.

[0060] Please see Figures 3 to 6 In some embodiments, the mounting groove 14 has a first mating surface 141, which is disposed toward the mesh surface 331. The mesh surface 331 has an inner surface facing the housing 1 and an outer surface facing away from the housing 1. The inner surface includes a second mating surface 3311, and the second mating surface 3311 is attached to the first mating surface 141. The outer surface and the inner surface are non-axisymmetric curved surfaces that are consistent with each other.

[0061] Optionally, the mounting groove 14 has a first mating surface 141, which is disposed facing the outside of the housing 1. Both the first mating surface 141 and the mounting groove 14 are annular. The housing 1 has an outer shell surface, which is higher than the first mating surface 141. The height difference between the outer shell surface and the first mating surface 141 is basically consistent with the thickness of the mesh surface 331. The first mating surface 141 can be a non-axisymmetric curved surface.

[0062] Before installation, the mesh surface 331 is a regular shape. The inner and outer surfaces of the mesh surface 331 have the same shape and are both axially symmetrical regular curved surfaces. When installing the protective net 33, the annular limiting fold 332 of the protective net 33 is inserted into the annular mounting groove 14 on the outer shell, so that the inner surface of the mesh surface 331 is in contact with the first mating surface 141. Then, during ultrasonic welding, the regular-shaped mesh surface 331 is deformed into an irregular shape. The shape of the inner surface of the mesh surface 331 is deformed into an irregular curved surface, and a second mating surface 3311 is formed on the inner surface. The shape of the second mating surface 3311 is the same as that of the first mating surface 141. Therefore, after ultrasonic welding, the inner surface of the mesh surface 331 is tightly in contact with the first mating surface 141.

[0063] Please see Figure 2 In some embodiments, the mechanism 2 further includes a bracket 23, which is disposed between the first speaker 21 and the second speaker 22. The bracket 23 is used to support at least the second speaker 22, and the bracket 23, the first speaker 21 and the second speaker 22 together form a rear acoustic cavity 210. A channel 231 is formed between the bracket 23 and the first speaker 21, and the channel 231 connects the first pressure relief hole 12, the second pressure relief hole 13 and the rear acoustic cavity 210.

[0064] Specifically, one end of the bracket 23 is positioned opposite to the first speaker 21, and the other end of the bracket 23 is used to support the second speaker 22, so that the first speaker 21, the bracket 23 and the second speaker 22 can be arranged sequentially along the same straight line, thereby enabling the first speaker 21, the bracket 23 and the second speaker 22 to form a series dual-speaker structure. The series dual-speaker structure not only reduces the sound interference between the first speaker 21 and the second speaker 22, but also enhances the stability of the overall structure.

[0065] In addition, the function of the bracket 23 is not limited to support and fixation. The bracket 23 can also work with the first speaker 21 and the second speaker 22 to form the rear sound cavity 210 of the first speaker 21. Furthermore, a channel 231 is formed between the bracket 23 and the first speaker 21. The channel 231 can be arranged around the rear sound cavity 210 so that the first pressure relief hole 12 and the second pressure relief hole 13 can be connected to the rear sound cavity 210 through the channel 231, which allows air to freely enter and exit the rear sound cavity 210.

[0066] Please see Figure 2 In some embodiments, the first speaker 21 and the second speaker 22 can both be positioned facing the sound outlet 11. When the first speaker 21 plays sound, the second speaker 22 can simultaneously perform noise reduction, which can effectively reduce noise from the same direction, allowing users to hear the audio content more clearly. The synergistic effect of the first speaker 21 and the second speaker 22 not only improves the sound quality but also enhances the noise reduction effect, bringing users a purer auditory experience.

[0067] In some embodiments, the output frequency of the first speaker 21 is higher than that of the second speaker 22. The first speaker 21 is an audio output component, and its output frequency is in a higher frequency range, such as the mid-high to high frequency range within the audible range of the human ear (typically from several hundred hertz to several thousand hertz or higher). The high-frequency first speaker 21 can clearly reproduce high-frequency details in music, such as the clarity and brightness of human voices, the overtones and details of instruments, etc. The second speaker 22 is a noise reduction component, and therefore does not need to output an audio signal like the first speaker 21. The second speaker 22 cancels out ambient noise by generating sound waves opposite to the noise. Therefore, the output frequency of the first speaker 21 is higher than that of the second speaker 22.

[0068] Further, please refer to Figure 5 In some embodiments, the first pressure relief hole 12 and the second pressure relief hole 13 are both oblong holes.

[0069] Optionally, the earphone 100 is generally designed to fit the user's ear in a flat or streamlined shape to reduce pressure on the ear and improve comfort during long-term wear. This results in the outer contour of the shell 1 also being a flat structure. The first pressure relief hole 12 and the second pressure relief hole 13 are designed as waist-shaped holes to fit the outer contour of the shell 1. The waist-shaped holes can also increase the flow area of ​​the first pressure relief hole 12 and the second pressure relief hole 13, thereby reducing the resistance when airflow passes through and making the air flow in the rear sound cavity 210 smoother.

[0070] Secondly, embodiments of this application provide an earphone assembly, which may include earphones 100 and a charging case. The charging case is used to house the earphones 100 so as to charge the earphones 100.

[0071] Optionally, the number of earphones 100 may be two, for example, and the charging case may form two connected or disconnected charging spaces, each for accommodating one earphone 100. The beneficial effects of the earphone assembly in this application are the same as those of the earphones 100 in this application, and will not be repeated here.

[0072] 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.

[0073] The above description is merely a preferred embodiment of this application and is 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 (100), characterized in that, The utility model relates to a loudspeaker, which comprises: a shell (1) provided with a sound hole (11), a first pressure relief hole (12) and a second pressure relief hole (13), wherein the sound hole (11) is located on one side of the shell (1), and the first pressure relief hole (12) and the second pressure relief hole (13) are respectively located on the other two sides of the shell (1); and a movement (2) arranged in the shell (1) and comprising: a first loudspeaker (21) arranged opposite to the sound hole (11); a second loudspeaker (22) arranged on the side of the first loudspeaker (21) away from the sound hole (11), wherein the second loudspeaker (22) is arranged in a spaced-apart manner with the first loudspeaker (21) and together forms a rear sound cavity (210) of the first loudspeaker (21), and the first pressure relief hole (12) and the second pressure relief hole (13) are both in communication with the rear sound cavity (210). The first pressure relief hole (12) and the second pressure relief hole (13) are respectively located on the opposite sides of the sound hole (11).

2. The earphone (100) according to claim 1, characterized in that, The central axes of the first pressure relief hole (12) and the second pressure relief hole (13) coincide.

3. The earphone (100) according to claim 2, characterized in that, The areas of the first pressure relief hole (12) and the second pressure relief hole (13) are equal.

4. The earphone (100) according to any one of claims 1 to 3, characterized in that, The shapes of the first pressure relief hole (12) and the second pressure relief hole (13) are both waist-shaped holes.

5. The earphone (100) according to any one of claims 1 to 3, characterized in that, The first pressure relief hole (12) and the second pressure relief hole (13) are both provided with a tuning assembly (3), wherein the tuning assembly (3) comprises:

6. The earphone (100) according to claim 1, characterized in that, a tuning net (31) covering the first pressure relief hole (12) or the second pressure relief hole (13); a first connecting layer (32) connected between the tuning net (31) and the shell (1). The tuning assembly (3) comprises:

7. The earphone (100) according to claim 6, characterized in that a protective net (33) covering the tuning net (31); a second connecting layer (34) connected between the protective net (33) and the tuning net (31). The tuning assembly (3) comprises a protective net (33), and the side surface of the shell (1) is provided with a mounting groove (14) surrounding the circumferential side of the first pressure relief hole (12) or the second pressure relief hole (13), and the protective net (33) is at least partially inserted into the mounting groove (14) and covers the tuning net (31).

8. The earphone (100) according to claim 6, characterized in that, The protective net (33) comprises a net surface part (331) and a limiting folded edge (332) arranged around the circumferential edge of the net surface part (331), the net surface part (331) has a plurality of mesh holes (333), the limiting folded edge (332) is inserted into the mounting groove (14) and is fixed to the mounting groove (14) by ultrasonic welding.

9. The earphone (100) according to claim 8, characterized in that ​ 10. The earphone (100) according to claim 9, characterized in that, The mounting groove (14) has a first matching surface (141) arranged towards the net surface (331), the net surface (331) has an inner surface facing the shell (1) and an outer surface facing away from the shell (1), the inner surface comprises a second matching surface (3311) which is attached to the first matching surface (141), and the outer surface and the inner surface are consistent non-axially symmetric curved surfaces.

11. The earphone (100) according to claim 1, characterized in that, The movement (2) further comprises a support (23) arranged between the first speaker (21) and the second speaker (22), the support (23) is used to support at least the second speaker (22), and the support (23), the first speaker (21) and the second speaker (22) jointly constitute the rear sound cavity (210), a channel (231) is formed between the support (23) and the first speaker (21), and the channel (231) communicates the first pressure relief hole (12), the second pressure relief hole (13) and the rear sound cavity (210).

12. The earphone (100) according to claim 1, characterized in that, The first speaker (21) and the second speaker (22) are both arranged towards the sound outlet hole (11).

13. The earphone (100) according to claim 1, characterized in that, The sound frequency of the first speaker (21) is higher than that of the second speaker (22).

14. An earphone assembly, characterized by The earphone (100) as claimed in any one of claims 1-13, and a charging box for accommodating the earphone (100) to charge the earphone (100).

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