CN113452827A

CN113452827A - Electronic device

Info

Publication number: CN113452827A
Application number: CN202110819696.0A
Authority: CN
Inventors: 胡金铃; 蒋国珠
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2021-09-28

Abstract

The application discloses an electronic device, which belongs to the technical field of communication devices. The disclosed electronic device includes a device housing and an acoustic device, wherein the device housing is provided with a first through hole, the acoustic device is provided with a sound guide hole, a main sound channel is formed in the device housing, and one end of the main sound channel is connected to the first through hole. A through hole is connected, the other end of the main sound guide channel is connected with the sound guide hole, an auxiliary sound guide channel is formed in the equipment shell, a second through hole is opened in the equipment shell, and one end of the auxiliary sound guide channel is connected with the main sound guide channel through the second through hole. The sound channel is communicated, the other end of the auxiliary sound guide channel is closed and arranged on the device casing, and the auxiliary sound guide channel is used to form a second sound wave whose phase is opposite to the first sound wave in the main sound channel. The above solution can solve the problem in the related art that a resonance peak is generated during the transmission of sound waves in the sound guiding structure, resulting in narrowing of the frequency bandwidth of the acoustic device and sound distortion at frequencies near the resonance peak.

Description

Electronic device

Technical Field

The application belongs to the technical field of communication equipment, and particularly relates to electronic equipment.

Background

Acoustic devices are widely used in electronic devices as electronic components for converting sound signals into electrical signals or vice versa. The acoustic device is arranged in the electronic equipment, is communicated with the outside through the sound guide structure, and transmits sound to the acoustic device through the sound guide structure, or transmits sound to the outside through the acoustic device, wherein a resonance peak exists, the resonance peak can cause sound distortion of frequency near the resonance peak, and meanwhile, the response after the resonance peak is rapidly reduced, so that the frequency width of the sound of the acoustic device is narrowed.

Disclosure of Invention

An object of the embodiments of the present application is to provide an electronic device, which can solve the problems in the related art that a resonance peak is generated during the transmission of a sound wave in a sound guide structure, so that the bandwidth of an acoustic device is narrowed, and the sound of a frequency near the resonance peak is distorted.

In order to solve the technical problem, the present application is implemented as follows:

the invention discloses an electronic device, comprising a device shell and an acoustic device, wherein:

the equipment shell is provided with a first through hole, the acoustic device is provided with a sound guide hole, a main sound guide channel is formed in the equipment shell, one end of the main sound guide channel is communicated with the first through hole, and the other end of the main sound guide channel is communicated with the sound guide hole;

the equipment comprises a main sound channel, an auxiliary sound guiding channel and a main sound channel, wherein the auxiliary sound guiding channel is formed in the equipment shell, a second through hole is formed in the equipment shell, one end of the auxiliary sound guiding channel is communicated with the main sound channel through the second through hole, the other end of the auxiliary sound guiding channel is arranged in the equipment shell in a sealed mode, and the auxiliary sound guiding channel is used for forming a second sound wave opposite to the first sound wave in the main sound channel in phase.

In this embodiment, a main sound guiding channel and an auxiliary sound guiding channel are formed in the device shell, after the sound waves enter the first through hole, or after the sound waves are transmitted out through the acoustic device, a part of the sound waves enter the main sound guiding channel to form first sound waves, a part of the sound waves enter the auxiliary sound guiding channel to form second sound waves, and the phases of the second sound waves and the first sound waves are opposite, so that the second sound waves can counteract the part of the first sound waves, which is equal to the frequency of the second sound waves, and the high-frequency sound waves in the first sound waves can be counteracted by controlling the frequency of the second sound waves, so that the resonance peak in the main sound guiding channel is suppressed, the resonance peak is reduced, the bandwidth is expanded, and the call quality and the sound recording effect are improved. Therefore, the electronic device disclosed by the application can solve the problems that in the related art, a resonance peak is generated in the process of transmitting sound waves in the sound guide structure, so that the bandwidth of an acoustic device is narrowed, and the sound of the frequency near the resonance peak is distorted.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device disclosed in an embodiment of the present application;

fig. 2 is a schematic internal structural view of a blocking structure including a first secondary sound guiding channel according to an embodiment of the present application;

FIG. 3 is a schematic view of an internal structure of a plugging structure including a second sub sound guiding channel according to an embodiment of the present application;

fig. 4 is an external structural schematic view of the plugging structure disclosed in the embodiment of the present application.

Description of reference numerals:

100-equipment shell, 110-first through hole, 120-main sound guide channel, 121-first section, 122-second section, 123-third section, 130-blocking structural part, 131-auxiliary sound guide channel, 1311-first channel, 1312-second channel, 140-notch, 150-inner cavity, 160-second through hole, 170-closed end, 180-supporting surface,

200-acoustic device, 210-leading sound hole,

300-dust-proof part,

400-a positioning structure,

500-shielding case, 510-holding tank,

600-sealing the structural member;

700-display screen;

800-antenna spring;

900-foam adhesive layer.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

Referring to fig. 1 to 4, an electronic device is disclosed in an embodiment of the present application, and the disclosed electronic device includes a device housing 100 and an acoustic device 200.

The device case 100 is a basic component of the electronic device, and provides a mounting base for some functional devices of the electronic device, such as the acoustic device 200, the display screen 700, and the antenna dome 800.

The device case 100 is provided with a first through hole 110, and the first through hole 110 is communicated with the outside, so that external sound waves can enter the device case 100 through the first through hole 110, or sound waves in the device case 100 can be transmitted to the outside through the first through hole 110. The main sound channel 120 is formed in the device case 100, the acoustic device 200 is provided with a sound guide hole 210, one end of the main sound channel 120 is communicated with the first through hole 110, and the other end of the main sound channel 120 is communicated with the sound guide hole 210, so that the sound wave entering the device case 100 from the first through hole 110 can be transmitted into the acoustic device 200 through the main sound channel 120 and the sound guide hole 210, or the sound wave emitted by the acoustic device 200 is finally transmitted to the outside through the sound guide hole 210 and the main sound channel 120. Alternatively, the acoustic device 200 may be a microphone or a receiver, etc.

An auxiliary sound guiding channel 131 is formed in the device shell 100, a second through hole 160 is formed in the device shell 100, one end of the auxiliary sound guiding channel 131 is communicated with the main sound guiding channel 120 through the second through hole 160, the other end of the auxiliary sound guiding channel 131 is arranged in the device shell 100 in a closed mode, and the auxiliary sound guiding channel 131 is used for forming a second sound wave with the phase opposite to that of the first sound wave in the main sound guiding channel 120. In this case, after the external sound wave enters the first through hole 110, or after the sound wave emitted by the acoustic device 200 is transmitted through the sound guide hole 210, a portion of the sound wave is transmitted in the main sound channel 120 to form a first sound wave, and another portion of the sound wave enters the sub sound guide channel 131 through the second through hole 160 to form a second sound wave, the second sound wave can meet the first sound wave at the second through hole 160, and since the phase of the second sound wave is opposite to the phase of the first sound wave, the portion of the first sound wave equal to the frequency of the second sound wave can be cancelled by the second sound wave, and therefore, the high-frequency band sound wave in the first sound wave can be cancelled by controlling the frequency of the second sound wave.

In this embodiment, the device housing 100 is provided with a main sound guiding channel 120 and an auxiliary sound guiding channel 131, after external sound waves enter the first through hole 110, or after sound waves emitted by the acoustic device 200 are transmitted out through the sound guiding hole 210, a part of the sound waves enter the main sound guiding channel 120 to form first sound waves, and a part of the sound waves enter the auxiliary sound guiding channel 131 to be modulated, so that opposite-phase sound waves in some frequency bands are formed at the second through hole 160, that is, second sound waves with opposite phases to the first sound waves are formed. Because the second sound wave and the first sound wave have opposite phases, the second sound wave can offset a high-frequency part of the first sound wave, which is equal to the second sound wave in frequency, and the high-frequency sound wave in the first sound wave can be offset by controlling the second sound wave in frequency, so that a resonance peak in the main sound guiding channel 120 is suppressed, the resonance peak is reduced, the bandwidth is expanded, and the call quality and the sound recording effect are improved. Therefore, the electronic device disclosed in the present application can solve the problems of the related art that a resonance peak is generated during the transmission of the sound wave in the sound guide structure, which results in the narrowing of the bandwidth of the acoustic device 200 and the distortion of the sound at the frequency near the resonance peak.

The secondary sound leading channel 131 may have a single channel structure or a multi-channel structure. Optionally, the secondary sound guiding channel 131 may include a first channel 1311 and a second channel 1312, the first channel 1311 and the second channel 1312 are arranged in parallel, and one end of the first channel 1311 and one end of the second channel 1312 are both communicated with the primary sound guiding channel 120 through the second through hole 160; the other end of the first channel 1311 and the other end of the second channel 1312 are both closed ends 170. The resonant frequency of the first channel 1311 is not equal to the resonant frequency of the second channel 1312, and the two resonant frequencies of the first channel 1311 and the second channel 1312 may be superimposed to form a resonant frequency band, and the frequency of the resonant frequency band coincides with the frequency of the second sound wave. Alternatively, the resonant frequency difference of the first channel 1311 and the second channel 1312 may be between 300Hz and 1500 Hz. In this case, the frequency range of the second sound wave can be widened by providing the plurality of channels, and the high-frequency resonance peak of the first sound wave is cancelled in a wide frequency band.

Both the cross-sectional area and the length of first channel 1311 affect the resonant frequency of first channel 1311, and both the cross-sectional area and the length of second channel 1312 affect the resonant frequency of second channel 1312. It should be noted that the length direction of the first channel 1311 is consistent with the direction of the sound wave transmitted in the first channel 1311, and the section of the first channel 1311 perpendicular to the sound wave transmission direction is the cross section of the first channel 1311, that is, the area of the section of the first channel 1311 perpendicular to the sound wave transmission direction is the cross section area of the first channel 1311; the length direction of the second channel 1312 coincides with the direction in which an acoustic wave propagates in the second channel 1312, and a cross-section of the second channel 1312 perpendicular to the direction of the acoustic wave propagation is a cross-sectional area of the second channel 1312, that is, an area of the cross-section of the second channel 1312 perpendicular to the direction of the acoustic wave propagation is a cross-sectional area of the second channel 1312.

There are various ways to achieve a difference in the resonant frequency of the first channel 1311 and the resonant frequency of the second channel 1312. Alternatively, the length of the first channel 1311 may be made different from the length of the second channel 1312. Alternatively, the cross-sectional area of the first channel 1311 may be made different from the cross-sectional area of the second channel 1312. Alternatively, the length of the first channel 1311 may be made different from the length of the second channel 1312, while the cross-sectional area of the first channel 1311 may be made different from the cross-sectional area of the second channel 1312. In this case, by making the lengths and/or cross-sectional areas of the first channel 1311 and the second channel 1312 different, it is achieved that the resonance frequency of the first channel 1311 and the resonance frequency of the second channel 1312 are different.

As described above, the length of first passage 1311 may affect the resonant frequency of first passage 1311, so the resonant frequency of first passage 1311 may be adjusted by changing the length of first passage 1311. Alternatively, the first channel 1311 may be linear. However, in the case where the first passage 1311 is provided in a straight line shape, the limit length of the first passage 1311 is small, and the desired resonance frequency of the first passage 1311 may not be achieved well. Similarly, the second channel 1312 may be linear, but when the second channel 1312 is linear, the limit length of the second channel 1312 is small, and the desired resonance frequency of the second channel 1312 may not be achieved well.

In order to solve the above problem, the first passage 1311 may be provided in a bent structure, and providing the first passage 1311 in the bent structure can increase the limit length of the first passage 1311. Alternatively, the second channel 1312 may have a bent structure, and the second channel 1312 may have a bent structure to increase the limit length of the second channel 1312. Alternatively, the first channel 1311 and the second channel 1312 may be provided in a bent structure. In this case, the length and shape of the first channel 1311 may be designed to reach the desired resonance frequency of the first channel 1311 according to the desired resonance frequency of the first channel 1311, and similarly, the length and shape of the second channel 1312 may be designed to reach the desired resonance frequency of the second channel 1312 according to the desired resonance frequency of the second channel 1312.

In a further aspect, in order to enable the first channel 1311 to adaptively satisfy a wider range of desired resonant frequencies, the first channel 1311 may include a plurality of first bent segments that are sequentially connected, and cross-sectional areas of at least two of the first bent segments are different. In this case, on the basis of increasing the length of the first channel 1311, the cross-sectional area of a part of the first bending section in the first channel 1311 may be changed, so that the equivalent mass and the acoustic compliance of the first channel 1311 may be adjusted, the overall impedance of the secondary guide tone channel 131 may be adjusted, a better bandwidth filtering effect may be finally achieved, and the first channel 1311 may also be adapted to achieve a wider range of expected resonant frequency.

In order to enable the second channel 1312 to adaptively satisfy a wider range of desired resonance frequencies, the second channel 1312 may include a plurality of second bent sections that are sequentially connected, and at least two of the second bent sections have different cross-sectional areas. In this case, on the basis of increasing the length of the second channel 1312, the cross-sectional area of a part of the second bending section in the second channel 1312 is changed, so that the equivalent mass and the acoustic compliance of the second channel 1312 can be adjusted, the overall impedance of the secondary sound guiding channel 131 can be adjusted, a better bandwidth filtering effect is finally achieved, and the second channel 1312 can adaptively reach a larger range of expected resonance frequency. Of course, where both first channel 1311 and second channel 1312 need to meet a greater range of expected resonant frequencies, the cross-sectional areas of at least two first bends of first channel 1311 may be made different while the cross-sectional areas of at least two second bends of second channel 1312 may be made different.

In the embodiment of the present application, the electronic device further includes a dust-proof member 300, the dust-proof member 300 is disposed on the device housing 100, and the dust-proof member 300 covers the second through hole 160. The provision of the dust-proof member 300 enables the acoustic resistance of the sub sound guide passage 131 to be adjusted. Alternatively, the dust-proof member 300 may be a dust-proof net. In this case, the dust-proof member 300 can adjust the acoustic resistance, and thus the peak value of the resonance peak in the main sound channel 120 can be further decreased. In addition, the dust-proof member 300 can prevent dust from entering the sub sound guide channel 131, and thus, the dust-proof member has a dual-purpose function.

To facilitate the installation of the dust-proof member 300, the apparatus housing 100 may be provided with a positioning structure 400, and the dust-proof member 300 may be provided to the positioning structure 400. Optionally, the positioning structure 400 may be a cylindrical protrusion, and the cylindrical protrusion is disposed around the second through hole 160, so that the dust-proof component 300 may be mounted on a surface of the cylindrical protrusion departing from the second through hole 160, or the positioning structure 400 may also be a groove structure disposed on the device housing 100, the second through hole 160 may be opened at a bottom of the groove structure, and an area of the bottom of the groove is greater than an area of the second through hole 160, so that the dust-proof component 300 may be mounted on the bottom of the groove. In this case, the positioning structure 400 can be used to more rapidly and accurately mount the dust-proof member 300 at the correct position so as to cover the second through hole 160, thereby preventing the mounting position of the dust-proof member 300 from being deviated.

As described above, the dust-proof member 300 can reduce the resonance peak, and the noise resistance of the dust-proof member 300 is different, so that the resonance peak can be reduced to different degrees, and therefore, the dust-proof member 300 can be detachably disposed on the device housing 100 for facilitating the subsequent replacement of the dust-proof member 300 according to the requirement. Alternatively, the dust-proof member 300 may be disposed on the device housing 100 through a clamping structure, or the dust-proof member 300 may be disposed on the device housing 100 through a magnetic structure. Under this kind of circumstances, the dismouting of the dustproof piece 300 of being convenient for is favorable to follow-up overhauing and changing dustproof piece 300.

The main sound channel 120 opens into the device housing 100, and a hole may be drilled in the device housing 100 to form the main sound channel 120. Referring to fig. 1 again, the axial direction of the first through hole 110 intersects with the axial direction of the sound guide hole 210 of the acoustic device 200, in order to achieve the communication between the first through hole 110 and the sound guide hole 210, the main sound channel 120 may be a bent structure, for example, the main sound channel 120 may include a first section 121, a second section 122, and a third section 123 that are sequentially bent and connected, but this undoubtedly increases the processing difficulty of the main sound channel 120.

In order to solve the above problem, the device housing 100 is provided with a first groove, the device housing 100 includes a blocking structure 130, the blocking structure 130 covers a notch 140 of the first groove, and the blocking structure 130 and the first groove enclose a partial structure of the main sound channel 120. In this case, a part of the bent section of the main sound channel 120 may be processed through the notch 140, for example, the first section 121 and the third section 123 of the main sound channel 120 may be processed through the notch 140. In this case, the difficulty of processing the main sound channel 120 is reduced. Alternatively, the blocking structure 130 may be a metamaterial structure.

The auxiliary sound guide channel 131 may be opened in the device housing 100, and the auxiliary sound guide channel 131 may be opened in the device housing 100 in various ways, for example, the auxiliary sound guide channel 131 may be opened in the device housing 100 by drilling. However, the processing difficulty of the above method is large because the internal space of the electronic device is small.

In order to solve the above problem, the sub sound guide channel 131 may be opened to the blocking structure 130. In this case, the secondary sound guiding channel 131 may be formed by drilling the blocking structure 130, and then the blocking structure 130 with the secondary sound guiding channel 131 may be fixed to the device housing 100, so as to reduce the processing difficulty of the secondary sound guiding channel 131. The plugging structure 130 may be sealed and adhered by foam adhesive, so as to achieve the sealing property of the secondary sound guide channel 131.

In a further technical solution, the blocking structure 130 may include a rib and two mounting plates, the two mounting plates are arranged in parallel, and two ends of the rib are respectively connected to two opposite surfaces of the two mounting plates, so that the rib and the two mounting plates jointly enclose the secondary sound guiding channel 131. In this case, compared with a processing method of directly drilling the blocking structure 130 to form the sub sound guide channel 131, the processing difficulty of the sub sound guide channel 131 is further reduced.

In a further technical scheme, the second recess has been seted up to equipment casing 100, and the diapire of second recess is seted up to first recess, and the diapire includes the holding surface 180 around notch 140, and shutoff structure 130 is located in the second recess, and the overlap joint is fixed in holding surface 180, and shutoff structure 130 and holding surface 180 sealing connection avoid the sound wave to get into the gap between shutoff structure 130 and the holding surface 180, cause the sound leakage. Alternatively, the blocking structure 130 may be adhesively secured to the support surface 180 by a foam adhesive layer 900. A partial region of the sub sound guide channel 131 is located in the supporting direction of the supporting surface 180. In this case, the space can be more sufficiently utilized, the length of the blocking structure 130 is increased, the length of the sub sound guide channel 131 is further increased, and finally, the adjustable range of the preset resonance frequency of the sub sound guide channel 131 is increased. The length direction of the blocking structure 130 is perpendicular to the thickness direction of the electronic device.

In order to ensure excellent sealing performance of the acoustic device 200, the electronic device further includes a shielding case 500, the device housing 100 has an inner cavity 150, the shielding case 500 is disposed in the inner cavity 150, the shielding case 500 has an accommodating groove 510 therein, the accommodating groove 510 is hermetically isolated from the inner cavity 150, and the acoustic device 200 is disposed in the accommodating groove 510. In this case, the space in the shield case 500 and the space in the cavity 150 of the electronic device are isolated from each other, thereby preventing electromagnetic interference.

Referring to fig. 1 again, the electronic device further includes a sealing structure 600, and the sealing structure 600 is hermetically connected between the main sound guiding channel 120 and the sound guiding hole 210. Alternatively, the sealing structure 600 may be a sealing foam. In this case, it is possible to prevent sound waves from entering the assembly gap of the device case 100 or the installation gap of the device case 100 and other functional devices through the gap between the main sound guide passage 120 and the sound guide hole 210 during transmission, and causing sound leakage.

In a further embodiment, the sealing structure 600 further comprises a dust screen, which can prevent dust from entering the interior of the acoustic device 200.

The electronic equipment disclosed by the embodiment of the application can be a smart phone, a tablet computer, an electronic reader or wearable equipment. Of course, the electronic device may also be other devices, which is not limited in this embodiment of the application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An electronic device, characterized in that it comprises a device housing (100) and an acoustic device (200), wherein:

the device shell (100) is provided with a first through hole (110), the acoustic device (200) is provided with a sound guide hole (210), a main sound guide channel (120) is formed in the device shell (100), one end of the main sound guide channel (120) is communicated with the first through hole (110), and the other end of the main sound guide channel (120) is communicated with the sound guide hole (210);

an auxiliary sound guide channel (131) is formed in the equipment shell (100), a second through hole (160) is formed in the equipment shell (100), one end of the auxiliary sound guide channel (131) is communicated with the main sound guide channel (120) through the second through hole (160), the other end of the auxiliary sound guide channel (131) is arranged in the equipment shell (100) in a sealed mode, and the auxiliary sound guide channel (131) is used for forming a second sound wave opposite to the phase of the first sound wave in the main sound guide channel (120).

2. The electronic device according to claim 1, wherein the secondary sound leading channel (131) comprises a first channel (1311) and a second channel (1312), the first channel (1311) and the second channel (1312) being arranged in parallel, one end of the first channel (1311) and one end of the second channel (1312) both communicating with the primary sound leading channel (120) through the second through hole (160); the other end of the first channel (1311) and the other end of the second channel (1312) are both closed ends (170).

3. The electronic device of claim 2, wherein the length of the first channel (1311) and the length of the second channel (1312) are different; and/or the cross-sectional area of the first channel (1311) and the cross-sectional area of the second channel (1312) are different.

4. The electronic device according to claim 2, wherein the first channel (1311) is a bent structure, and the first channel (1311) comprises a plurality of sequentially connected first bent segments, wherein at least two first bent segments have different cross-sectional areas; and/or the second channel (1312) is of a bent structure, and the second channel (1312) comprises a plurality of second bent sections which are communicated in sequence, wherein the cross-sectional areas of at least two second bent sections are different.

5. The electronic device according to claim 1, further comprising a dust-proof member (300), wherein the dust-proof member (300) is provided to the device case (100), and the dust-proof member (300) covers the second through hole (160).

6. The electronic device of claim 5, wherein the device housing (100) is provided with a positioning structure (400), and the dust-proof member (300) is provided on the positioning structure (400).

7. The electronic device according to claim 1, wherein the device housing (100) is provided with a first groove, the device housing (100) comprises a blocking structure (130), the blocking structure (130) covers a notch (140) of the first groove, the blocking structure (130) and the first groove enclose a partial structure of the main sound guide channel (120), and the auxiliary sound guide channel (131) is provided in the blocking structure (130).

8. The electronic device according to claim 7, wherein the device housing (100) is provided with a second groove, the first groove is provided in a bottom wall of the second groove, the bottom wall comprises a supporting surface (180) surrounding the notch (140), the blocking structure (130) is provided in the second groove and is fixed to the supporting surface (180) in an overlapping manner, and the blocking structure (130) is connected to the supporting surface (180) in a sealing manner; the partial area of the auxiliary sound guide channel (131) is located in the supporting direction of the supporting surface (180).

9. The electronic device according to claim 1, wherein the device housing (100) defines an inner cavity (150), the electronic device further comprises a shielding cover (500), the shielding cover (500) is disposed in the inner cavity (150), a receiving groove (510) is formed in the shielding cover (500), the receiving groove (510) is hermetically isolated from the inner cavity (150), and the acoustic device (200) is disposed in the receiving groove (510).

10. The electronic device according to claim 1, further comprising a sealing structure (600), wherein the sealing structure (600) is sealingly connected between the main sound channel (120) and the sound guiding hole (210).