A headset that switches between noise-cancelling or transparent modes using a lifting airbag

Abstract

This invention discloses a pair of headphones that uses a lifting airbag to switch between noise-canceling and transparency modes. The headphones include a headband with earcups connected to both ends. A PCBA circuit board, a speaker, and a noise-canceling microphone are installed inside the earcups. The PCBA circuit board is electrically connected to both the speaker and the noise-canceling microphone. Located behind the speaker, the PCBA circuit board includes a Hall switch and a control module. A lifting airbag is installed inside the rear of the earcup, and a lifting cover is connected to its rear. When the lifting airbag rises, the lifting cover opens backward from the rear of the earcup; when the lifting airbag descends, the lifting cover closes forward to the rear of the earcup. A permanent magnet is installed at the connection between the lifting cover and the lifting airbag. The Hall switch and the permanent magnet are positioned opposite each other and magnetically inductively cooperate. This invention allows the headphones to switch between noise-canceling and transparency modes by raising or lowering the lifting airbag, making it easy for an external observer to determine whether the mode is noise-canceling or transparency.

Description

Technical Field

[0001] This invention relates to the field of headphone technology, and in particular to a pair of over-ear headphones that use a lifting airbag to switch between noise cancellation and transparency modes. Background Technology

[0002] As people's living standards improve, their demands for music are also increasing. Even in noisy environments, they crave an immersive music experience, leading to the growing popularity of noise-canceling headphones. Currently, there are two types of noise-canceling headphones: active noise-canceling headphones and passive noise-canceling headphones. Active noise-canceling headphones work by generating sound waves that are the opposite of external noise, neutralizing it and achieving noise reduction. Passive noise-canceling headphones primarily block external noise by creating a closed space around the ears or using sound-insulating materials such as foam ear tips.

[0003] However, noise cancellation isn't always necessary when wearing headphones. In some situations, users actually need the headphone's microphone to capture ambient sound in real time, process it with an algorithm, and mix it with the headphone speaker audio so that the user can hear both the sound from the headphone speaker and the surrounding sounds clearly. For example, when students are wearing headphones to attend class, they need to hear both the sound from the headphone speaker and the teacher's lecture. This mode is called the headphone's transparency mode.

[0004] In view of this, existing technologies have gradually developed headphones that can switch between noise cancellation and transparency modes. For example, Chinese patent documents CN115134708A and CN120692495A disclose methods for switching headphone modes, which can switch headphones from noise cancellation mode to transparency mode, or vice versa. However, these patents control mode switching through software algorithms or buttons, and cannot switch between noise cancellation and transparency modes by opening or closing the earcups. They also cannot allow external personnel to observe whether the headphones are in noise cancellation or transparency mode. For example, it is impossible for teachers to know whether the headphones worn by students are in noise cancellation or transparency mode. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a pair of headphones that use a lifting airbag to switch between noise cancellation and transparency modes, based on the shortcomings of the prior art. The headphones can switch between noise cancellation mode and transparency mode by raising or lowering the lifting airbag. The headphones can also be easily used by outsiders to determine whether the headphones are in noise cancellation mode or transparency mode by observing whether the lifting cover is open or closed.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a pair of headphones with a lifting airbag that switches between noise cancellation and transparency modes, comprising a headband, with ear shells connected to both ends of the headband, a PCBA circuit board, a speaker, and a noise-canceling microphone installed inside the ear shells, the PCBA circuit board being electrically connected to the speaker and the noise-canceling microphone respectively, the PCBA circuit board being located behind the speaker, and a Hall switch and a control module being provided on the PCBA circuit board; a lifting airbag is installed inside the rear end of the ear shells, and a lifting cover is connected to the rear end of the lifting airbag, the lifting cover being able to open from the ear shell when the lifting airbag is raised. When the rear end opens backward and the lifting airbag descends forward, the lifting cover can close to the rear end of the ear shell. A permanent magnet is installed at the connection between the lifting cover and the lifting airbag. The Hall switch is positioned opposite the permanent magnet and magnetically inductively cooperates with it. The permanent magnet can move backward or forward with the lifting cover and the lifting airbag. When the Hall switch senses the permanent magnet approaching, the Hall switch sends a first command to the control module, and the control module controls the noise-canceling microphone to enter noise-canceling mode. When the Hall switch senses the permanent magnet moving away, the Hall switch sends a second command to the control module, and the control module controls the noise-canceling microphone to switch to transparency mode.

[0007] The beneficial effects of this invention are as follows: When the lifting cover closes to the rear end of the earpiece and the lifting airbag is in a forward-descending state, the permanent magnet approaches the Hall switch on the PCBA circuit board. The Hall switch senses the magnet's proximity and sends a first command to the control module, which then controls the noise-canceling microphone to enter noise-canceling mode. When the user pulls the lifting cover backward, the lifting airbag connected to the cover rises backward, opening the cover from the rear end of the earpiece. The permanent magnet moves backward along with the cover and airbag, moving away from the Hall switch. The Hall switch senses the magnet's distance and sends a second command to the control module, which then controls the noise-canceling microphone to enter transparency mode. Therefore, this invention enables headphones to switch between noise-canceling and transparency modes by raising or lowering the lifting airbag. Furthermore, the headphones of this invention allow external personnel to easily determine whether the headphones are in noise-canceling or transparency mode by observing whether the lifting cover is open or closed. When the lifting cover is closed, the headphones are in noise-canceling mode; when it is open, they are in transparency mode. This is particularly useful for teachers to quickly determine whether headphones worn by students are in noise-canceling or transparency mode.

[0008] This invention features an airbag mounting plate installed inside the rear end of the ear canal. The airbag mounting plate contains an airbag housing cavity for accommodating a flexible lifting airbag. The lifting airbag has a first airbag connecting part at its front end, and a second airbag connecting part within the airbag housing cavity. The first and second airbag connecting parts are detachably snapped together. This invention divides the ear canal into front and rear cavities using the airbag mounting plate. The PCBA circuit board, speaker, and noise-canceling microphone are installed inside the front end of the ear canal, while the lifting airbag and lifting cover are installed at the rear end, preventing external moisture from entering the front end of the ear canal. Simultaneously, the airbag mounting plate can position and position the lifting airbag. The lifting airbag and the airbag mounting plate are connected via the snap-fit ​​of the first and second airbag connecting parts, allowing both the lifting airbag and the lifting cover to be replaced, facilitating changes to the shape and pattern on the lifting cover's surface.

[0009] The first airbag connecting part of this invention is a first connecting ring, with a plurality of snap-fit ​​holes spaced apart on the first connecting ring. The second airbag connecting part is a second connecting ring, with a plurality of snap-fit ​​hooks corresponding to the snap-fit ​​holes spaced apart on the outer side of the second connecting ring. The first connecting ring is fitted over the second connecting ring, and the snap-fit ​​hooks are engaged in the corresponding snap-fit ​​holes. Since the lifting airbag is a flexible lifting airbag, when the first connecting ring of the lifting airbag is fitted over the second connecting ring of the airbag mounting plate, the snap-fit ​​hooks can be directly engaged in the corresponding snap-fit ​​holes, which is convenient to operate and has good stability.

[0010] The lifting airbag of the present invention includes a first airbag unit, a second airbag unit connected to the rear end of the first airbag unit, the first airbag unit and the second airbag unit being respectively disc-shaped, and the diameter of the first airbag unit being larger than the diameter of the second airbag unit. The first airbag connecting part is located at the front end of the first airbag unit, and the lifting cover is connected to the rear end of the second airbag unit. This structure allows the second airbag unit to retract into the first airbag unit when the lifting airbag descends, and to pop out from the first airbag unit when the lifting airbag rises.

[0011] The lifting cover of this invention includes an inner cover and an outer cover connected to each other. A connector is provided between the inner cover and the lifting airbag. A magnetic groove is provided inside the front end of the connector, and a permanent magnet is installed in the magnetic groove. This invention, through the connector, can both connect the inner cover and the lifting airbag and position the permanent magnet.

[0012] An LED indicator light is provided between the inner and outer covers of this invention. The light emitted by the LED indicator light can pass through the outer cover and shine outwards. The LED indicator light is connected to the PCBA circuit board via wires. When the noise-canceling microphone is in noise-canceling mode, the LED indicator light is off; when the noise-canceling microphone is in transparency mode, the LED indicator light is on. This invention's LED indicator light allows external personnel to more easily determine whether the headphones are in noise-canceling or transparency mode by observing whether the lifting cover is on or off. When the lifting cover is closed, the LED indicator light is off; when the lifting cover is open, the LED indicator light is on. This is particularly suitable for teachers to quickly determine whether the headphones worn by students are in noise-canceling or transparency mode.

[0013] The noise-canceling microphone of this invention includes a feedforward microphone and a feedback microphone. The feedforward microphone is installed inside the rear end of the earcup, and the feedback microphone is installed inside the front end of the earcup, located near the speaker's sound output position. When the headphones are in noise-canceling mode, the feedforward microphone can collect ambient noise before it enters the ear. The control module on the PCBA circuit board generates an inverse sound wave based on this signal. This inverse sound wave meets and cancels out the original noise in the ear canal. The feedback microphone can collect the residual noise that actually reaches the ear after noise reduction by the feedforward microphone. The control module on the PCBA circuit board generates a more precise inverse sound wave based on this residual noise signal for secondary cancellation, thereby achieving noise reduction. When the headphones are in transparency mode, both the feedforward and feedback microphones collect external sound signals. The control module on the PCBA circuit board directly causes the speaker to play the sound based on this external sound signal, allowing the user to hear external sounds through the speaker.

[0014] The present invention also includes earcups in the form of over-ear and on-ear earcups. The front end of the earcup can be detachably connected to either the over-ear or on-ear earcup. Preferably, the front end of the earcup has a third connecting ring with several first locking blocks spaced apart. The rear end of the earcup has a fourth connecting ring with several second locking blocks corresponding to the first locking blocks spaced apart. The third connecting ring is fitted over the fourth connecting ring, and the second locking blocks are rotated and locked into their corresponding first locking blocks. The present invention, through the detachable locking mechanism of the third and fourth connecting rings, allows the headphones to be converted into over-ear headphones with over-ear earcups or over-ear headphones with on-ear earcups, providing flexible and convenient conversion. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of the present invention in noise reduction mode.

[0016] Figure 2 This is an overall structural diagram of the present invention in its transparent mode.

[0017] Figure 3 This is a longitudinal sectional view of the left earphone portion of the present invention in noise reduction mode.

[0018] Figure 4 This is a longitudinal sectional view of the left earphone portion of the present invention in the transparent mode.

[0019] Figure 5 This is a schematic diagram of the first-view dispersion structure of the left earphone portion of the present invention.

[0020] Figure 6 This is a schematic diagram of the second-view dispersion structure of the left earphone portion of the present invention. Detailed Implementation

[0021] The structural and working principles of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] In the description of this invention, the directional term "front" refers to the side closer to the earcups, and the directional term "rear" refers to the side closer to the lifting cover. The above directional terms are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] like Figures 1-6As shown, this invention is a pair of headphones that uses a lifting airbag to switch between noise cancellation and transparency modes. It includes a headband 1, with earcups 2 connected to both ends of the headband 1. A PCBA circuit board 3, a speaker 4, and a noise-canceling microphone are installed inside the earcups 2. The PCBA circuit board 3 is electrically connected to both the speaker 4 and the noise-canceling microphone. The PCBA circuit board 3 is located behind the speaker 4. A Hall switch 5 and a control module 6 are mounted on the PCBA circuit board 3. In this embodiment, the control module 6 is an MCU chip. A lifting airbag 7 is installed inside the rear end of the earcups 2. A lifting cover 8 is connected to the rear end of the lifting airbag 7. When the lifting airbag 7 rises, the lifting cover 8 can... Opening from the rear end of the earcup 2, the lifting airbag 7 descends forward, allowing the lifting cover 8 to close behind the earcup 2. A permanent magnet 9 is installed at the connection between the lifting cover 8 and the lifting airbag 7. The Hall switch 5 is positioned opposite the permanent magnet 9 and magnetically inductively engages with it. The permanent magnet 9 can move backward or forward with the lifting cover 8 and the lifting airbag 7. When the Hall switch 5 senses the permanent magnet 9 approaching, it sends a first command to the control module 6, which then controls the noise-canceling microphone to enter noise-canceling mode. When the Hall switch 5 senses the permanent magnet 9 moving away, it sends a second command to the control module 6, which then controls the noise-canceling microphone to switch to transparency mode. It should be noted that the left and right earcups of the headphones have a similar overall structure; therefore... Figures 3-6 Only the structure of the left earphone is shown; the structure of the right earphone is not shown.

[0024] When the lifting cover 8 closes to the rear end of the ear shell 2, and the lifting airbag 7 is in a forward-descending state, the permanent magnet 9 approaches the Hall switch 5 on the PCBA circuit board 3. The Hall switch 5 senses the proximity of the permanent magnet 9 and sends a first command to the control module 6. The control module 6 then controls the noise-canceling microphone to enter noise-canceling mode. When the user pulls the lifting cover 8 backward, the lifting airbag 7 connected to the lifting cover 8 rises backward, opening the lifting cover 8 from the rear end of the ear shell 2. The permanent magnet 9 moves backward with the lifting cover 8 and the lifting airbag 7, moving away from the Hall switch 5. The Hall switch 5 senses the distance of the permanent magnet 9 and sends a second command to the control module 6. The control module 6 then controls the noise-canceling microphone. In transparent mode; thus, the present invention can switch the headphones between noise-canceling mode and transparent mode by raising or lowering the lifting airbag 7. Furthermore, the headphones of the present invention allow external personnel to easily determine whether the headphones are in noise-canceling mode or transparent mode by observing whether the lifting cover 8 is open or closed. When external personnel observe that the lifting cover 8 of the headphones is closed, it is determined that the headphones are in noise-canceling mode; when external personnel observe that the lifting cover 8 of the headphones is open, it is determined that the headphones are in transparent mode. This is particularly suitable for teachers to quickly determine whether the headphones worn by students are in noise-canceling mode or transparent mode.

[0025] like Figures 3-6 As shown, the present invention has an airbag mounting plate 10 installed inside the rear end of the ear shell 2. The airbag mounting plate 10 has an airbag receiving cavity 101 for accommodating the lifting airbag 7. The lifting airbag 7 is a flexible lifting airbag 7. The front end of the lifting airbag 7 has a first airbag connecting part 711. The airbag receiving cavity 101 has a second airbag connecting part 102. The first airbag connecting part 711 and the second airbag connecting part 102 are detachably engaged. The present invention divides the ear shell 2 into two cavities, front and rear, by means of an airbag mounting plate 10. The PCBA circuit board 3, speaker 4 and noise-canceling microphone are installed inside the front end of the ear shell 2, and the lifting airbag 7 and lifting cover 8 are installed inside the rear end of the ear shell 2 to prevent external moisture from entering the front end of the ear shell 2. At the same time, the airbag mounting plate 10 can position and vacate the lifting airbag 7. The lifting airbag 7 and the airbag mounting plate 10 are connected by a first airbag connecting part 711 and a second airbag connecting part 102, which allows both the lifting airbag 7 and the lifting cover 8 to be replaced, and facilitates the replacement of the shape and pattern on the surface of the lifting cover 8.

[0026] like Figures 3-6As shown, the first airbag connecting part 711 of the present invention is a first connecting ring, and a plurality of snap-fit ​​holes 712 are provided on the first connecting ring at intervals. The second airbag connecting part 102 is a second connecting ring, and a plurality of snap-fit ​​hooks 103 corresponding to the snap-fit ​​holes 712 are provided on the outer side of the second connecting ring at intervals. The first connecting ring is fitted over the second connecting ring, and the snap-fit ​​hooks 103 are snapped into the corresponding snap-fit ​​holes 712. Since the lifting airbag 7 is a flexible lifting airbag 7, when the first connecting ring of the lifting airbag 7 is fitted over the second connecting ring of the airbag mounting plate 10, the snap-fit ​​hooks 103 can be directly snapped into the corresponding snap-fit ​​holes 712, which is convenient to operate and has good stability.

[0027] like Figures 3-6 As shown, the lifting airbag 7 of the present invention includes a first airbag unit 71, and a second airbag unit 72 is connected to the rear end of the first airbag unit 71. The first airbag unit 71 and the second airbag unit 72 are respectively disc-shaped, and the diameter of the first airbag unit 71 is larger than the diameter of the second airbag unit 72. The first airbag connecting part 711 is provided at the front end of the first airbag unit 71, and the lifting cover 8 is connected to the rear end of the second airbag unit 72. This structure allows the second airbag unit 72 to retract into the first airbag unit 71 when the lifting airbag 7 descends, and the second airbag unit 72 to pop out from the first airbag unit 71 when the lifting airbag 7 rises.

[0028] like Figure 3 and Figure 4 As shown, the lifting cover 8 of the present invention includes an inner cover 81 and an outer cover 82 connected to each other. A connector 83 is provided between the inner cover 81 and the lifting airbag 7. A magnet groove is provided inside the front end of the connector 83, and the permanent magnet 9 is installed in the magnet groove. The present invention can connect the inner cover 81 and the lifting airbag 7 through the connector 83, and can also position the permanent magnet 9. An LED indicator light (not shown) is provided between the inner cover 81 and the outer cover 82 of the present invention. The light emitted by the LED indicator light can pass through the outer cover 82 and then be emitted outward. The LED indicator light is connected to the PCBA circuit board 3 through a wire (not shown). When the noise-canceling microphone is in noise-canceling mode, the LED indicator light is off; when the noise-canceling microphone is in transparency mode, the LED indicator light is on. This invention incorporates an LED indicator light, which allows external personnel to more easily determine whether the headphones are in noise-canceling or transparency mode by observing whether the lifting cover 8 is lit or off. When the lifting cover 8 is closed, the LED indicator light is off; when the lifting cover 8 is open, the LED indicator light is on. This is particularly useful for teachers to quickly determine whether the headphones worn by students are in noise-canceling or transparency mode.

[0029] The noise-canceling microphone of this invention includes a feedforward microphone 11 and a feedback microphone 12. The feedforward microphone 11 is installed inside the rear end of the ear shell 2, and the feedback microphone 12 is installed inside the front end of the ear shell 2, located near the sound output position of the speaker 4. When the headphones are in noise-canceling mode, the feedforward microphone 11 can collect ambient noise before it enters the ear. The control module 6 on the PCBA circuit board 3 generates an inverse sound wave based on this signal. This inverse sound wave meets and cancels out the original noise in the ear canal. The feedback microphone 12 can collect the residual noise that actually reaches the ear after being noise-canceled by the feedforward microphone 11. The control module 6 on the PCBA circuit board 3 generates a more accurate inverse sound wave based on this residual noise signal for secondary cancellation, thereby achieving noise reduction. When the headphones are in transparency mode, both the feedforward microphone 11 and the feedback microphone 12 collect external sound signals. The control module 6 on the PCBA circuit board 3 directly causes the speaker 4 to play the external sound signal, allowing the user to hear external sounds through the speaker 4.

[0030] The present invention's over-ear headphones also include earcups 13. In this embodiment, the earcups 13 have two types: over-ear and on-ear. This embodiment only shows the over-ear type earcups; the on-ear type earcups are not shown. The front end of the ear shell 2 can be detachably connected to either the over-ear or on-ear type earcups. Preferably, the front end of the ear shell 2 is provided with a third connecting ring 21, and the third connecting ring 21 is provided with a plurality of first locking blocks 211 spaced apart. The rear end of the earcup is provided with a fourth connecting ring 131, and the fourth connecting ring 131 is provided with a plurality of second locking blocks 132 spaced apart, corresponding to the first locking blocks 211. The third connecting ring 21 is fitted outside the fourth connecting ring 131, and the second locking blocks 132 are rotated and locked into their corresponding first locking blocks 211. The present invention enables the headphones to be transformed into over-ear headphones with over-ear earcups or over-ear headphones with on-ear earcups through the detachable snap-fit ​​connection of the third connecting ring 21 and the fourth connecting ring 131, making the transformation flexible and convenient.

[0031] The above description is merely a preferred embodiment of the present invention. Any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical solution of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A headphone that switches between a noise-cancelling mode and a transparent mode using a lifting airbag, characterized by: The device includes a headband with earcups connected to both ends. A PCBA circuit board, a speaker, and a noise-canceling microphone are installed inside the earcups. The PCBA circuit board is electrically connected to both the speaker and the noise-canceling microphone. The PCBA circuit board is located behind the speaker and has a Hall switch and a control module mounted on it. A lifting airbag is installed inside the rear end of the earcup, and a lifting cover is connected to its rear end. When the lifting airbag rises, the lifting cover opens backward from the rear end of the earcup; when the lifting airbag descends forward, the lifting cover closes to the rear end of the earcup. A permanent magnet is installed at the connection between the lifting cover and the lifting airbag. The Hall switch is positioned opposite the permanent magnet and magnetically inductively engages with it. The permanent magnet can move backward or forward with the lifting cover and the lifting airbag. When the Hall switch senses the permanent magnet approaching, it sends a first command to the control module, which puts the noise-canceling microphone into noise-canceling mode. When the Hall switch senses the permanent magnet moving away, it sends a second command to the control module, which switches the noise-canceling microphone to transparency mode.

2. The over-ear headphones with a lifting airbag for switching between noise cancellation and transparency modes as described in claim 1, characterized in that: An airbag mounting plate is installed inside the rear end of the ear shell. The airbag mounting plate has an airbag receiving cavity for accommodating the lifting airbag. The lifting airbag is a flexible lifting airbag. The front end of the lifting airbag has a first airbag connecting part. The airbag receiving cavity has a second airbag connecting part. The first airbag connecting part and the second airbag connecting part are detachably snapped together.

3. The over-ear headphones with a lifting airbag for switching between noise cancellation and transparency modes as described in claim 2, characterized in that: The first airbag connecting part is a first connecting ring, and a plurality of snap-fit ​​holes are provided on the first connecting ring at intervals. The second airbag connecting part is a second connecting ring, and a plurality of snap-fit ​​hooks corresponding to the snap-fit ​​holes are provided on the outer side of the second connecting ring at intervals. The first connecting ring is fitted over the second connecting ring, and the snap-fit ​​hooks are snapped into the corresponding snap-fit ​​holes.

4. The over-ear headphones with a lifting airbag for switching between noise cancellation and transparency modes as described in claim 2, characterized in that: The lifting airbag includes a first airbag unit, and a second airbag unit is connected to the rear end of the first airbag unit. The first airbag unit and the second airbag unit are respectively disc-shaped, and the diameter of the first airbag unit is larger than the diameter of the second airbag unit. The first airbag connecting part is located at the front end of the first airbag unit, and the lifting cover is connected to the rear end of the second airbag unit.

5. The over-ear headphones with a lifting airbag for switching between noise cancellation and transparency modes as described in claim 2, characterized in that: The lifting cover includes an inner cover and an outer cover that are connected to each other. A connector is provided between the inner cover and the lifting airbag. A magnetic groove is provided inside the front end of the connector, and the permanent magnet is installed inside the magnetic groove.

6. The over-ear headphones with a lifting airbag for switching between noise cancellation and transparency modes as described in claim 5, characterized in that: An LED indicator light is provided between the inner cover and the outer cover. The light emitted by the LED indicator light can pass through the outer cover and shine outward. The LED indicator light is connected to the PCBA circuit board through wires. When the noise-canceling microphone is in noise-canceling mode, the LED indicator light is off. When the noise-canceling microphone is in transparency mode, the LED indicator light is on.

7. The over-ear headphones according to claim 1, which employ a lifting airbag to switch between noise cancellation and transparency modes, are characterized in that: The noise-canceling microphone includes a feedforward microphone and a feedback microphone. The feedforward microphone is installed inside the rear end of the ear shell, and the feedback microphone is installed inside the front end of the ear shell and located near the sound output position of the speaker.

8. The over-ear headphones with a lifting airbag for switching between noise cancellation and transparency modes according to any one of claims 1-7, characterized in that: It also includes earmuffs, which are available in two types: over-ear and on-ear. The front end of the ear shell can be detachably connected to either the over-ear or on-ear type.

9. The over-ear headphones according to claim 8, which employ a lifting airbag to switch between noise cancellation and transparency modes, are characterized in that: The front end of the earcup is provided with a third connecting ring, and the third connecting ring is provided with a plurality of first locking blocks spaced apart. The rear end of the earcup is provided with a fourth connecting ring, and the fourth connecting ring is provided with a plurality of second locking blocks spaced apart, corresponding to the first locking blocks. The third connecting ring is fitted outside the fourth connecting ring, and the second locking blocks are rotated and locked into the corresponding first locking blocks.

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