Audio output module and open earphone

Abstract

The present application relates to an audio output module and an open earphone, the audio output module comprising: a central sound emitting hole; a plurality of side sound emitting holes, which are arranged on the same plane as the central sound emitting hole and are arranged in a circumferential direction around the central sound emitting hole, each side sound emitting hole and the central sound emitting hole are oriented in the same direction to output sound; wherein the sound output from each side sound emitting hole has a phase difference with the sound output from the central sound emitting hole. The above-mentioned audio output module produces destructive interference through the sound output from the central sound emitting hole and the sound output from the side sound emitting hole, so that the volume of the sound output from the central sound emitting hole into the user's ear canal is enhanced, and the user can get a good listening experience without a larger volume, while the far-field volume emitted by the central sound emitting hole is reduced through destructive interference, which greatly reduces the volume of the audio output module leakage sound, ensures the privacy of the user and improves the user experience.

Description

Technical Field

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

[0002] Open-back headphones are portable audio output devices that conduct sound within a specific range. Compared to traditional in-ear and over-ear headphones, open-back headphones do not block or cover the ear canal, allowing users to hear ambient sound while listening to music, thus improving safety and comfort.

[0003] However, due to their open-back design, open-back headphones suffer from more sound leakage than traditional headphones. Users need to increase the volume to get a better listening experience, but increasing the volume also causes the sound leakage from open-back headphones to be even greater, which can not only affect people around the user but also compromise the user's privacy. Summary of the Invention

[0004] Therefore, it is necessary to provide an audio output module and open-back headphones that improve upon the aforementioned defects in addressing the sound leakage problem of open-back headphones.

[0005] An audio output module, comprising:

[0006] Central sound hole;

[0007] Multiple side sound holes are located on the same plane as the central sound hole and are arranged circumferentially around the central sound hole. Each of the side sound holes and the central sound hole outputs sound in the same direction.

[0008] The sound output from each of the side sound holes has a phase difference with the sound output from the center sound hole.

[0009] In one embodiment, the central sound hole is used to output sound in a first frequency range, and each of the side sound holes is used to output sound in a second frequency range, the first frequency range including frequencies higher than the second frequency range.

[0010] In one embodiment, the side sound holes include two, which are located on opposite sides of the central sound hole, and the sound output from the two side sound holes is out of phase.

[0011] In one embodiment, the audio output module includes a housing and a speaker, the speaker being installed inside the housing and including a first sound-emitting part and a plurality of second sound-emitting parts, all of the second sound-emitting parts corresponding one-to-one with all of the side sound-emitting holes;

[0012] The first sound-emitting part is used to output sound to the central sound-emitting hole, and each of the second sound-emitting parts is used to output sound to the corresponding side sound-emitting hole;

[0013] Wherein, the sound path from the first sound-emitting part to the central sound-emitting hole is less than the sound path from each of the second sound-emitting parts to the corresponding side sound-emitting hole.

[0014] In one embodiment, the interior of the housing is formed with a central sound guide tube and a plurality of side sound guide tubes. The sound output from the first sound-emitting part is output to the central sound-emitting hole after passing through the central sound guide tube. The sound output from each of the second sound-emitting parts is output to the corresponding side sound-emitting hole after passing through one of the side sound guide tubes. The length of each side sound guide tube is greater than the length of the central sound guide tube.

[0015] In one embodiment, the loudspeaker includes a body, on which both the first sound-emitting part and the second sound-emitting part are mounted;

[0016] The body and the shell define a central acoustic cavity and a plurality of suspended acoustic cavities. The first sound-emitting part is located in the central acoustic cavity, and each of the second sound-emitting parts is located in one of the suspended acoustic cavities. The central acoustic cavity is connected to the central sound guide tube, and each of the suspended acoustic cavities is connected to one of the side sound guide tubes.

[0017] In one embodiment, the first sound-emitting part is a diaphragm dome mounted on the body, and the second sound-emitting part is a diaphragm suspension mounted on the body.

[0018] In one embodiment, the housing and the body define a back cavity on the side opposite to the first and second sound-emitting parts.

[0019] In one embodiment, a back sound hole is provided on the side of the housing away from the central sound hole and the side sound hole, and a back sound guide tube is formed inside the housing. One end of the back sound guide tube is connected to the back cavity, and the other end is connected to the back sound hole.

[0020] An open-back headphone, including an audio output module as described in any of the preceding claims.

[0021] The aforementioned audio output module uses destructive interference between the sound output from the central sound hole and the sound output from the side sound holes. This enhances the volume of the sound output from the central sound hole to the user's ear canal, allowing the user to enjoy a good listening experience without needing to increase the volume. At the same time, the far-field volume emitted from the central sound hole is reduced through destructive interference. The combination of these two factors ensures a good listening experience for the user while significantly reducing sound leakage from the audio output module, thus protecting the user's privacy and improving the user experience. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the audio output module in one embodiment of the present invention;

[0023] Figure 2 This is an exploded view of the audio output module in one embodiment of the present invention;

[0024] Figure 3 for Figure 2 Top view of the audio output module in the embodiment;

[0025] Figure 4 for Figure 3 Schematic diagram of the cross section at point AA;

[0026] Figure 5 for Figure 3 Schematic diagram of the cross section at point BB;

[0027] Figure 6 for Figure 1 A schematic diagram of the speaker structure of the audio output module in the embodiment.

[0028] Central sound-emitting hole 10; Side sound-emitting hole 11; Damping mesh 12;

[0029] 20. Shell; 21. Central sound guide tube; 22. Side sound guide tube; 23. Central acoustic cavity; 24. Suspended acoustic cavity; 25. Back cavity; 26. Back sound hole; 27. Back sound guide tube;

[0030] Loudspeaker 30; first sound-emitting part 31; second sound-emitting part 32; main body 33. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] See Figure 1 and Figure 2 An embodiment of the present invention provides an audio output module, including a central sound-emitting hole 10 and a plurality of side sound-emitting holes 11. The plurality of side sound-emitting holes 11 are located on the same plane as the central sound-emitting hole 10, and all the side sound-emitting holes 11 are arranged circumferentially around the central sound-emitting hole 10. The central sound-emitting hole 10 and all the side sound-emitting holes 11 are used to output sound in the same direction, so that the audio output module can output sound in a preset direction. When the user wears the audio output module near the ear, the preset direction faces the ear canal, and the sound from the audio output module can be directly output into the user's ear canal.

[0038] The sound output from each side sound hole 11 has a phase difference from the sound output from the central sound hole 10. This causes destructive interference between the sound output from the central sound hole 10 and the sound output from the side sound holes 11. Specifically, the sound output from the central sound hole 10 and all the side sound holes 11 towards a preset direction, also known as near-field sound, combines due to destructive interference, thus amplifying the volume of the sound output from the audio output module towards the preset direction, and consequently amplifying the volume of the sound output into the user's ear canal. Conversely, the sound output from the central sound hole 10 and all the side sound holes 11 towards directions other than the preset direction, also known as far-field sound, cancels each other out due to destructive interference, thus reducing the volume of the sound output from the audio output module towards the preset direction, and consequently reducing the volume of the sound leaking out of the audio output module.

[0039] Compared to using a single side sound hole 11 to cancel out the sound from the central sound hole 10, using multiple side sound holes 11 arranged around the central sound hole 10 allows the near-field sound emitted by the central sound hole 10 to be simultaneously amplified by multiple sound streams. At the same time, the far-field sound emitted by the central sound hole 10 in different directions can be canceled out by the sound emitted by the side sound holes 11 located at different positions, greatly reducing the volume of sound leakage from the audio output module.

[0040] The aforementioned audio output module generates destructive interference between the sound output from the central sound hole 10 and the sound output from multiple side sound holes 11. This enhances the volume of the sound output from the central sound hole 10 to the user's ear canal, allowing the user to enjoy a good listening experience without needing to increase the volume. At the same time, the far-field volume emitted from the central sound hole 10 is reduced through destructive interference. The combination of these two factors ensures a good listening experience for the user while significantly reducing sound leakage from the audio output module, thus protecting the user's privacy and improving the user experience.

[0041] In embodiments of the present invention, the central sound hole 10 is used to output a first frequency sound in a preset direction, and each side sound hole 11 is used to output a second frequency sound in the same preset direction as the central sound hole 10, so that the frequency range of the sound transmitted to the human ear by the audio output module is wider, thereby improving the user's listening experience.

[0042] In actual use, high-frequency sounds are more prone to attenuation, especially those in the 2kHz-4kHz range, which is the area of ​​human hearing sensitivity. Therefore, the first frequency range includes frequencies higher than the second frequency range; for example, the first frequency range is 1000Hz-10000Hz, and the second frequency range is 100Hz-1000Hz. In this way, the high-frequency sounds output from the central sound port 10 directly enter the user's ear canal, avoiding high-frequency attenuation and improving the user's listening experience in the high-frequency range. Simultaneously, the multiple side sound ports 11 output low-frequency sounds, thereby improving the user's listening experience in the low-frequency range. Together, these two mechanisms provide a more comfortable listening experience.

[0043] It should be noted that the first frequency range includes frequencies higher than the second frequency range. This means that the first and second frequency ranges may or may not include overlapping frequency ranges, as long as the maximum frequency threshold of the first frequency range is greater than the maximum frequency threshold of the second frequency range.

[0044] In an embodiment of the present invention, there are two side sound holes 11, which are located on opposite sides of the central sound hole 10, so that the sound emitted by the two side sound holes 11 simultaneously cancels the sound emitted by the central sound hole 10, thereby increasing the volume of the near-field sound of the audio output module and reducing the volume of the far-field sound of the audio output module.

[0045] In order to improve the effect of destructive interference between the sound emitted from the two side sound holes 11 and the sound emitted from the central sound hole 10, the sound output from the two side sound holes 11 is out of phase, so that the sound emitted from the central sound hole 10 can be enhanced in the near field and reduced in the far field by the sound emitted from one of the side sound holes 11 at any phase.

[0046] In the embodiments of the present invention, see Figure 2 The audio output module includes a housing 20 and a speaker 30. The speaker 30 is installed inside the housing 20 and is acoustically connected to the central sound hole 10 and all the side sound holes 11. Acoustic connection means that the sound output by the speaker 30 can be transmitted to the central sound hole 10 or the side sound holes 11, and then the sound of the speaker 30 is output to the outside through the central sound hole 10 and all the side sound holes 11.

[0047] Among them, see Figure 1 To enable the central sound-emitting hole 10 and all the side sound-emitting holes 11 to output sounds of different frequencies, the loudspeaker 30 includes a first sound-emitting section 31 and a plurality of second sound-emitting sections 32. Specifically, the first sound-emitting section 31 is used to output sounds within a first frequency range and is acoustically connected to the central sound-emitting hole 10 so that the central sound-emitting hole 10 can output high-frequency sounds. All the second sound-emitting holes 32 correspond one-to-one with all the side sound-emitting holes, and each second sound-emitting section 32 is used to output sounds within a second frequency range and is acoustically connected to the corresponding side sound-emitting hole 11 so that each side sound-emitting hole 11 can output low-frequency sounds.

[0048] Furthermore, if the first sound-emitting part 31 and all the second sound-emitting parts 32 are directly facing the central sound-emitting hole 10 and all the side sound-emitting holes 11, the sound emitted from the central sound-emitting hole 10 will be in phase with the sound emitted from all the side sound-emitting holes 11, and the interference cancellation effect cannot be achieved. Therefore, the sound path from the first sound-emitting part 31 to the central sound-emitting hole 10 is greater than the sound path from each second sound-emitting part 32 to its corresponding side sound-emitting hole 11. Sound path refers to the distance the sound beam travels. Thus, the sound emitted from the second sound-emitting part 32 has to travel a longer distance than the first sound-emitting part 31 to reach the side sound-emitting hole 11. Consequently, the sound emitted from the side sound-emitting hole 11 will have a phase delay compared to the sound emitted from the central sound-emitting hole 10, resulting in a phase difference between the sound emitted from the side sound-emitting hole 11 and the sound emitted from the central sound-emitting hole 10.

[0049] Specifically, see Figure 3 , Figure 4 and Figure 5 Inside the housing 20, a central sound guide tube 21 and multiple side sound guide tubes 22 are formed. All the side sound guide tubes 22 and all the side sound holes 11 are connected in a one-to-one correspondence. The sound output from the first sound-emitting part 31 is output to the central sound hole 10 after passing through the central sound guide tube 21. The sound output from each second sound-emitting part 32 is output to the corresponding side sound hole 11 after passing through one of the side sound guide tubes 22. The length of each side sound guide tube 22 is greater than the length of the central sound guide tube 21.

[0050] Thus, the sound emitted by the second sound-emitting part 32 needs to travel a longer path to reach the side sound-emitting hole 11 through the side sound-guiding tube 22, so that the sound emitted by the side sound-emitting hole 11 is delayed for a certain period of time, thereby forming a phase difference with the sound emitted from the central sound-emitting hole 10.

[0051] Specifically, in this embodiment, there are two side sound holes 11 and two side sound guide tubes 22, which are located on opposite sides of the central sound guide tube 21. The central sound guide tube 21 extends straight along a preset direction so that the first sound-emitting part 31 can output sound in a directional manner in the preset direction through the central sound guide tube 21. The two side sound guide tubes 22 are arranged in a curved manner on both sides of the central sound guide tube 21, so that the length of the side sound guide tubes 22 is greater than that of the central sound guide tube 21, and the sound emitted by the second sound-emitting part 32 has to travel a longer distance to reach the side sound holes 11.

[0052] It should be noted that in other embodiments, the sound path from the first sound-emitting part 31 to the central sound-emitting hole 10 and the sound path from the second sound-emitting part 32 to the side sound-emitting hole 11 can be adjusted by setting a resonant acoustic cavity, a sound hole, a sound slit, a tuning mesh or tuning cotton in the housing 20, so that the sound output from the side sound-emitting hole 11 and the sound output from the central sound-emitting hole 10 have a phase difference.

[0053] In some embodiments, see Figure 6 The loudspeaker 30 also includes a body 33. The first sound-emitting part 31 and all the second sound-emitting parts 32 are mounted on the body 33. The body 33 is installed in the housing 20 and defines a central acoustic cavity 23 and multiple suspended acoustic cavities 24 with the housing 20. The first sound-emitting part 31 is disposed in the central acoustic cavity 23, and each second sound-emitting part 32 is disposed in one of the suspended acoustic cavities 24. At the same time, the central acoustic cavity 23 is connected to the central sound guide tube 21, and each suspended acoustic cavity 24 is connected to one of the side sound guide tubes 22.

[0054] In actual use, by adjusting the structural dimensions of the central acoustic cavity 23 and each suspended acoustic cavity 24, the impedance characteristics and resonant frequency of the central acoustic cavity 23 and each suspended acoustic cavity 24 can be changed, thereby adjusting the expressiveness of the sound output from the central sound hole 10 and each side sound hole 11, so as to improve the sound quality of the audio output module.

[0055] Optionally, the first sound-generating part 31 is a diaphragm dome mounted on the main body 33, and the second mounting part is a diaphragm suspension mounted on the main body 33. Both the diaphragm dome and the diaphragm suspension are thin films that generate sound by vibrating air. The diaphragm in the diaphragm dome vibrates the air with a smaller amplitude, while the diaphragm suspension vibrates the air with a larger amplitude. Thus, the diaphragm dome can output higher frequency sounds compared to the diaphragm suspension. Therefore, the sound in the first frequency range is output through the diaphragm dome, and the sound in the second frequency range is output through the diaphragm suspension.

[0056] In a specific embodiment, to further improve the sound quality of the audio output module, a back cavity 25 is defined on the side of the housing 20 and body 33 away from the first sound-emitting part 31 and the second sound-emitting part 32. The back cavity 25 improves the equivalent compliance of the diaphragm dome and diaphragm suspension. Specifically, the air in the back cavity 25 can form an acoustic spring on the back of the diaphragm dome and diaphragm suspension. When the diaphragm dome and diaphragm suspension vibrate the air, they compress the air in the back cavity 25 and push it in the opposite direction towards the central acoustic cavity 23 and the side acoustic cavity 24. Thus, the back cavity 25 improves the smoothness of the vibration of the diaphragm dome and diaphragm suspension, making the sound output from the diaphragm dome and diaphragm suspension to the central sound hole 10 and the side sound hole 11 less muffled, thereby improving the user's listening experience.

[0057] Specifically, in the embodiments, to further improve the user's listening experience, please refer to... Figure 1 A back sound hole 26 is provided on the side of the housing 20 away from the central sound hole 10 and all the side sound holes 11. A back sound guide tube 27 is formed inside the housing 20. One end of the back sound guide tube 27 is connected to the back cavity 25, and the other end is connected to the back sound hole 26. In this way, when the air in the back cavity 25 is vibrated by the diaphragm dome and diaphragm suspension, the air in the back cavity 25 will also be discharged through the back sound guide tube 27 and the back sound hole 26, or external air will be drawn into the back cavity 25, thereby further improving the smoothness of the vibration of the diaphragm dome and diaphragm suspension, and thus improving the user's listening experience.

[0058] It should be noted that in the above embodiments, in order for the sound emitted by the speaker 30 to be directed towards the central acoustic cavity 23 and the side acoustic cavity 24, the speaker 30 needs to be placed laterally relative to the central sound guide tube 21 and the side sound guide tube 22. In other embodiments, the central acoustic cavity 23 and the side acoustic cavity 24 may not be provided, and the speaker 30 may be directly directed towards the central sound guide tube 21 and the side sound guide tube 22. The sound emitted by the speaker 30 directly enters the central sound guide tube 21 and the side sound guide tube 22 and is finally directly output to the ear. That is to say, in the above embodiments, the axial direction of the speaker 30 is perpendicular to the preset direction, and the speaker 30 is placed laterally relative to the ear. In this embodiment, the axial direction of the speaker 30 is parallel to the preset direction, so that the speaker 30 can be directly directed towards the ear. This embodiment can be used in traditional headphones, so that traditional headphones can also use the above-mentioned audio output module, and the above-mentioned audio output module can reduce the sound leakage of headphones and improve the listening experience of headphones.

[0059] In embodiments of the present invention, the audio output module further includes multiple damping meshes 12. The damping meshes 12 are provided in the central sound hole 10 and each side sound hole 11. In actual use, the acoustic impedance of the damping meshes 12 is adjusted by adjusting the material of the damping meshes 12, thereby adjusting the amplitude of the sound output from the central sound hole 10 and each side sound hole 11.

[0060] The present invention also provides an open-back headphone, including the audio output module as described in any of the above embodiments. When a user wears the open-back headphone, the central sound hole 10 of the audio output module faces the user's ear canal, thereby amplifying the volume of the sound output from the central sound hole 10 into the ear canal through multiple side sound holes 11, and simultaneously canceling the sound output from the central sound hole 10 out of the ear canal through multiple side sound holes 11. The two work together to ensure the user's experience while greatly reducing the sound leakage problem of open-back headphones and preventing the leakage of user privacy.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An audio output module, characterized in that, The audio output module includes: Central sound hole (10); Multiple side sound holes (11) are located on the same plane as the central sound hole (10) and are arranged circumferentially around the central sound hole (10). Each side sound hole (11) and the central sound hole (10) output sound in the same direction. The sound output from each of the side sound holes (11) has a phase difference with the sound output from the center sound hole (10); The central sound-emitting hole (10) is used to output sound in a first frequency range, and each of the side sound-emitting holes (11) is used to output sound in a second frequency range, wherein the first frequency range includes frequencies higher than the second frequency range; The side sound holes (11) include two, and the two side sound holes (11) are located on opposite sides of the central sound hole (10), and the sound output from the two side sound holes (11) is in opposite phase; The audio output module includes a housing (20) and a speaker (30). The speaker (30) is installed inside the housing (20) and includes a first sound-emitting part (31) and a plurality of second sound-emitting parts (32). All the second sound-emitting parts (32) correspond one-to-one with all the side sound-emitting holes (11). The first sound-emitting part (31) is used to output sound to the central sound-emitting hole (10), and each of the second sound-emitting parts (32) is used to output sound to the corresponding side sound-emitting hole (11). Wherein, the sound path from the first sound-emitting part (31) to the central sound-emitting hole (10) is less than the sound path from each of the second sound-emitting parts (32) to the corresponding side sound-emitting hole (11); The housing (20) has a central sound guide tube (21) and a plurality of side sound guide tubes (22) inside. The sound output from the first sound-emitting part (31) is output to the central sound-emitting hole (10) after passing through the central sound guide tube (21). The sound output from each of the second sound-emitting parts (32) is output to the corresponding side sound-emitting hole (11) after passing through one of the side sound guide tubes (22). The length of each side sound guide tube (22) is greater than the length of the central sound guide tube (21).

2. The audio output module according to claim 1, characterized in that, The loudspeaker (30) includes a body (33), and the first sound-emitting part (31) and the second sound-emitting part (32) are both mounted on the body (33); The body (33) and the shell (20) define a central acoustic cavity (23) and a plurality of suspended acoustic cavities (24). The first sound-emitting part (31) is located in the central acoustic cavity (23), and each of the second sound-emitting parts (32) is located in one of the suspended acoustic cavities (24). The central acoustic cavity (23) is connected to the central sound guide tube (21), and each of the suspended acoustic cavities (24) is connected to one of the side sound guide tubes (22).

3. The audio output module according to claim 2, characterized in that, The shell (20) and the body (33) define a back cavity (25) on the side away from the first sound-emitting part (31) and the second sound-emitting part (32).

4. The audio output module according to claim 3, characterized in that, The housing (20) has a back sound hole (26) on the side away from the central sound hole (10) and the side sound hole (11). A back sound guide tube (27) is formed inside the housing (20). One end of the back sound guide tube (27) is connected to the back cavity (25), and the other end is connected to the back sound hole (26).

5. The audio output module according to claim 2, characterized in that, The first sound-emitting part (31) is a diaphragm dome mounted on the body (33), and the second sound-emitting part (32) is a diaphragm suspension mounted on the body (33).

6. An open-back headphone, characterized in that, Includes the audio output module as described in any one of claims 1-5.

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