CN116647797A

CN116647797A - Speaker and electronic equipment

Info

Publication number: CN116647797A
Application number: CN202310668328.XA
Authority: CN
Inventors: 蒋国珠; 龙立锋
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2023-06-06
Filing date: 2023-06-06
Publication date: 2023-08-25

Abstract

The application belongs to the technical field of sound production devices, and particularly relates to a loudspeaker and electronic equipment. The loudspeaker comprises a loudspeaker shell and a loudspeaker main body, wherein the loudspeaker main body is arranged in the loudspeaker shell, a loudspeaker front cavity and a loudspeaker rear cavity are formed between the loudspeaker main body and the loudspeaker shell, the loudspeaker shell is further provided with a sound guide channel, a first end of the sound guide channel is communicated with the loudspeaker rear cavity, a second end of the sound guide channel is communicated with the loudspeaker front cavity, and the sound guide channel is used for changing the phase of sound waves in the loudspeaker rear cavity so as to enable the sound waves in the loudspeaker front cavity to be overlapped with the sound waves in the loudspeaker rear cavity.

Description

Speaker and electronic equipment

Technical Field

The application belongs to the technical field of sound production devices, and particularly relates to a loudspeaker and electronic equipment.

Background

Along with the development of terminal equipment such as mobile phones, users have higher and higher requirements on sound quality, and better low-frequency sound production efficiency and low-frequency sound production intensity are required, so that the volume of a rear cavity of a loudspeaker is usually increased in the industry at present, and an intelligent power amplifier is used for enabling the loudspeaker to obtain a larger excitation signal, so that the low-frequency sound production efficiency and the low-frequency sound production intensity of the loudspeaker are improved. Increasing the volume of the rear cavity of the speaker will increase the volume of the speaker and thus the volume of the terminal device.

Disclosure of Invention

The embodiment of the application aims to provide a loudspeaker and electronic equipment, which can realize high and low frequency sound production efficiency and high and low frequency sound production intensity by utilizing a limited space.

In order to solve the technical problems, the application is realized as follows:

in a first aspect, an embodiment of the present application provides a speaker, including a speaker housing and a speaker main body, the speaker main body being disposed in the speaker housing, a speaker front cavity and a speaker rear cavity being formed between the speaker main body and the speaker housing,

the loudspeaker shell is also provided with a sound guide channel, the first end of the sound guide channel is communicated with the rear cavity of the loudspeaker, the second end of the sound guide channel is communicated with the front cavity of the loudspeaker, and the sound guide channel is used for changing the phase of sound waves in the rear cavity of the loudspeaker so as to enable the sound waves in the front cavity of the loudspeaker to be overlapped with the sound waves in the rear cavity of the loudspeaker.

In a second aspect, an embodiment of the present application further provides an electronic device, including the above speaker, where the electronic device further includes a main board upper cover, the speaker housing has a mating surface disposed towards the main board upper cover, the sound guide channel is disposed on the mating surface, and the sound guide channel is located on a side of the mating surface away from the main board upper cover and faces the main board upper cover.

In the embodiment of the application, a loudspeaker front cavity and a loudspeaker rear cavity are formed between the loudspeaker main body and the loudspeaker shell, a sound outlet channel on the loudspeaker shell is communicated with the loudspeaker front cavity, a sound guide channel is also arranged on the loudspeaker, two ends of the sound guide channel are respectively communicated with the loudspeaker rear cavity and the loudspeaker front cavity, the vibrating diaphragm of the loudspeaker main body can vibrate, sound waves can be respectively formed in the loudspeaker front cavity and the loudspeaker rear cavity, sound waves in the loudspeaker front cavity can propagate to the outside of the loudspeaker, sound waves in the loudspeaker rear cavity can enter the loudspeaker front cavity through the sound guide channel and are overlapped with sound waves in the loudspeaker front cavity, and the sound guide channel can change the phase of the sound waves in the loudspeaker rear cavity, so that the sound waves in the loudspeaker rear cavity are in opposite phase and tend to be consistent with the phase of the sound waves in the loudspeaker front cavity, and the low-frequency sound production efficiency and the low-frequency sound production intensity are further enhanced. Therefore, the application can enhance the low-frequency sound production efficiency and the low-frequency sound production intensity by arranging the sound guide channel on the loudspeaker shell without increasing the volume of the loudspeaker and using the intelligent power amplifier, thereby realizing the purposes of high-frequency sound production efficiency and high-frequency sound production intensity by using limited space. In addition, in the in-process of speaker work, the interior heated gas of speaker back chamber accessible leads the sound passageway and discharges outside the speaker to the heat in the discharge speaker, with the problem that the heat that solves the speaker and give off is difficult to give off.

Drawings

Fig. 1 is a schematic cross-sectional view of an electronic device according to an embodiment of the present application;

fig. 2 is a schematic diagram of a portion of an electronic device according to an embodiment of the present application;

fig. 3 is a schematic diagram of a part of an electronic device according to an embodiment of the present application;

fig. 4 is a schematic cross-sectional view of an electronic device according to another embodiment of the present application.

Reference numerals illustrate:

100-speaker housing, 101-sound outlet channel, 102-sound guide channel, 110-housing, 111-housing body, 112-top cover, 113-front cavity cover, 114-rear cavity cover, 120-support, 200-speaker body, 310-speaker front cavity, 320-speaker rear cavity, 321-filling cavity, 322-particulate matter, 400-first dust screen, 500-sealing sheet, 600-second dust screen, 700-middle frame, 710-sound outlet hole, 800-main board upper cover.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that some, but not all embodiments of the application are described. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

The speaker and the electronic device provided by the embodiment of the application are described in detail below through specific embodiments and application scenarios thereof with reference to the accompanying drawings.

As shown in fig. 1 to 4, the embodiment of the present application discloses a speaker, which includes a speaker housing 100 and a speaker main body 200, wherein the speaker main body 200 is disposed in the speaker housing 100, and a speaker front cavity 310 and a speaker rear cavity 320 are formed between the speaker main body 200 and the speaker housing 100. Specifically, the speaker housing 100 may further have a sound outlet channel 101, where the sound outlet channel 101 communicates with the speaker front cavity 310, and sound waves in the speaker front cavity 310 may propagate from inside the speaker to outside the speaker through the sound outlet channel 101.

The speaker housing 100 also has a sound guide channel 102, a first end of the sound guide channel 102 being in communication with the speaker rear cavity 320 and a second end of the sound guide channel 102 being in communication with the speaker front cavity 310. Specifically, the second end of the sound guide channel 102 may be directly connected to the speaker front cavity 310, or may be indirectly connected to the speaker front cavity 310 through the sound outlet channel 101.

The sound guide channel 102 is used to change the phase of sound waves in the speaker rear chamber 320 so that sound waves in the speaker front chamber 310 overlap sound waves in the speaker rear chamber 320.

In the embodiment of the application, a front speaker cavity 310 and a rear speaker cavity 320 are formed between the speaker main body 200 and the speaker housing 100, the sound outlet channel 101 on the speaker housing 100 is communicated with the front speaker cavity 310, the speaker is also provided with a sound guide channel 102, two ends of the sound guide channel 102 are respectively communicated with the rear speaker cavity 320 and the front speaker cavity 310, the vibrating diaphragm of the speaker main body 200 can vibrate, thus sound waves can be respectively formed in the front speaker cavity 310 and the rear speaker cavity 320, sound waves in the front speaker cavity 310 can propagate outside the speaker, sound waves in the rear speaker cavity 320 can enter the front speaker cavity 310 through the sound guide channel 102 and are overlapped with sound waves in the front speaker cavity 310, and the sound guide channel 102 can change the phase of sound waves in the rear speaker cavity 320, so that the sound waves in the rear speaker cavity 320 are in opposite phase and tend to be consistent with the phase of sound waves in the front speaker cavity 310, and the low-frequency sound production efficiency and the low-frequency sound production intensity are further enhanced; therefore, the application can enhance the low-frequency sound emission efficiency and the low-frequency sound emission intensity by arranging the sound guide channel 102 on the loudspeaker shell 100 without increasing the volume of the loudspeaker and using the intelligent power amplifier, thereby realizing the purposes of high-frequency sound emission efficiency and high-frequency sound emission intensity by using a limited space. In addition, during the operation of the speaker, the heated air in the speaker rear chamber 320 can be discharged out of the speaker through the sound guide channel 102, so as to discharge the heat in the speaker, so as to solve the problem that the heat emitted by the speaker is difficult to be emitted.

In an alternative embodiment, the sound guide 102 is used to change the phase of sound waves in the back speaker chamber 320 such that sound waves in the front speaker chamber 310 are superimposed positively with sound waves in the back speaker chamber 320. Thus, the low-frequency sounding efficiency and the low-frequency sounding intensity can be further enhanced.

In an alternative embodiment, the sound waves in the speaker rear cavity 320 may be inverted by adjusting the structural parameters of the sound guide channel 102; wherein the structural parameter includes at least one of a length and a cross-sectional area of the sound guide channel 102. In this embodiment, the ability of the sound guide channel 102 to change the phase of the sound wave of the speaker rear cavity 320 is adjusted by adjusting the length and cross-sectional area of the sound guide channel 102, such as: the length and cross-sectional area of the sound guide channel 102 may be adjusted such that the phase difference between the sound waves in the front speaker chamber 310 and the sound waves in the rear speaker chamber 320 is less than half the phase of the sound waves in the front speaker chamber 310 to facilitate the positive superposition of the two. The cross-sectional area of the sound guide channel 102 is the area of the cross-section of the sound guide channel 102 perpendicular to the axis thereof.

In an alternative embodiment, speaker rear cavity 320 includes a filling cavity 321, and filling cavity 321 is filled with particulate matter 322. In this embodiment, the filling cavity 321 in the speaker rear cavity 320 is filled with the particles 322, and the particles 322 are porous and can adsorb air molecules, so that the equivalent volume of the speaker rear cavity 320 can be increased, which is equivalent to increasing the volume of the speaker rear cavity 320, and further increasing the low-frequency sound production efficiency and the low-frequency sound production intensity. It can be seen that, in this embodiment, the particles 322 are filled in the filling cavity 321, so that the low-frequency sound emission efficiency and the low-frequency sound emission intensity can be increased without increasing the volume of the speaker. In addition, since the speaker rear cavity 320 is communicated with the sound guide channel 102, the air in the speaker rear cavity 320 has better circulation, and the particles 322 in the filling cavity 321 can more fully adsorb air molecules, so that the equivalent volume of the speaker rear cavity 320 can be further increased.

In an alternative embodiment, the filling cavity 321 is located at one side of the speaker body 200 in a first direction, wherein the first direction is perpendicular to the height direction of the speaker. In this embodiment, taking the orientation shown in fig. 1 as an example, the filling cavity 321 is located at one side of the speaker main body 200 along the first direction, where the filling cavity 321 is not stacked above or below the speaker main body 200, that is, the filling cavity 321 is disposed side by side with the speaker main body 200, which can compress the height of the speaker housing 100, thereby reducing the space in the height direction in the electronic device occupied by the speaker.

In an alternative embodiment, the first end of the sound guide channel 102 is disposed adjacent to the filling cavity 321, which can make all the particles 322 in the filling cavity 321 disposed near the first end of the sound guide channel 102, and the first end of the sound guide channel 102 is in communication with the speaker front cavity 310, so that the air flow of the first end of the sound guide channel 102 is better, so that the particles 322 in the filling cavity 321 can more fully adsorb air molecules, and further increase the equivalent volume of the speaker rear cavity 320. In the case of combining the present embodiment with the previous embodiment, the speaker can have a larger equivalent volume in the case that the speaker is compressed at the height of the speaker housing 100, so that the speaker has better low-frequency sound emission efficiency and low-frequency sound emission intensity.

In an alternative embodiment, at least a portion of the filling cavity 321 is located on a side of the speaker body 200 facing away from the speaker front cavity 310, which may enable at least a portion of the particles 322 to be located on a side of the speaker body 200 facing away from the speaker front cavity 310, such that the space on the side of the speaker body 200 facing away from the speaker front cavity 310 may be fully utilized to fill the particles 322, which may increase the volume of the filling cavity 321, thereby increasing the volume of the particles 322 filled therein, and thus increasing the equivalent volume of the speaker rear cavity 320.

In an alternative embodiment, the first end of the sound guiding channel 102 is disposed away from the filling cavity 321, so that the particles 322 in the filling cavity 321 are further away from the first end of the sound guiding channel 102, and therefore, the particles 322 in the filling cavity 321 do not block the heated air in the speaker rear cavity 320 from entering the sound guiding channel 102, so that the speaker has a good heat dissipation effect. In combination with the above embodiment, the filling cavity 321 can be made to have a larger volume, and the heated gas in the speaker rear cavity 320 is not blocked from entering the sound guiding channel 102.

In an alternative embodiment, a first dust screen 400 is disposed within the speaker rear chamber 320, the first dust screen 400 and the inner wall of the speaker rear chamber 320 together forming a filling chamber 321. In this embodiment, the inner walls of the first dust screen 400 and the speaker rear cavity 320 form the filling cavity 321, and the inner walls of the first dust screen 400 and the speaker rear cavity 320 can block the movement of the particles 322 in the filling cavity 321, so that the abrasion of the particles 322 in the movement process is reduced, and further the problem that the equivalent volume of the speaker rear cavity 320 is increased to be limited due to the abrasion of the particles 322 can be prevented. Of course, the filling cavity 321 may be formed by an air-permeable separator such as an orifice plate in addition to the first dust-proof screen 400, or the particle 322 may be directly filled into the speaker rear cavity 320 to form the filling cavity 321, and the present application is not limited to the manner of forming the filling cavity 321.

In an alternative embodiment, first dust screen 400 is positioned between particulate matter 322 and a first end of sound guide channel 102. In this embodiment, the first dust screen 400 is located between the particles 322 and the first end of the sound guiding channel 102, so that the first dust screen 400 can prevent the particles 322 in the filling cavity 321 from entering the sound guiding channel 102, and further can prevent the particles 322 from blocking the sound guiding channel 102 to block the sound wave and heat of the speaker rear cavity 320 from being transferred to the speaker front cavity 310. Therefore, the first dust screen 400 of the present embodiment can reduce the abrasion of the particles 322 during the movement process and prevent the particles 322 from entering the sound guide channel 102, so as to achieve the multi-purpose effect.

Alternatively, the speaker housing 100 includes a housing 110, an accommodating space is provided in the housing 110, and the speaker main body 200 is provided in the accommodating space. Optionally, the sound guide channel 102 may be provided inside the housing 110, but this requires a larger wall thickness of the housing 110, which not only increases the volume within the electronic device occupied by the speaker, but also increases the weight of the speaker, thereby reducing the user experience.

In an alternative embodiment, the speaker further comprises a sealing sheet 500, a part of the area of the housing 110 is recessed in a direction towards the receiving space and forms a sound guiding groove with an opening facing away from the receiving space, and the sealing sheet 500 covers the opening of the sound guiding groove to form the sound guiding channel 102. In this embodiment, a part of the housing 110 is recessed into the accommodating space to form a sound guiding groove, and the sound guiding groove cooperates with the sealing plate 500 to form the sound guiding channel 102, so that the sound guiding channel 102 does not need to be formed in the housing 110, and therefore, the wall thickness of the housing 110 can be reduced, and the volume and weight of the speaker can be reduced. In addition, once the sound guide channel 102 of the previous embodiment is formed, the cross-sectional shape and cross-sectional area of the sound guide channel 102 cannot be changed, but in this embodiment, the shape of the sealing sheet 500 is changed, or the sealing sheet 500 with a different shape is used to cover the sound guide groove, for example, the sealing sheet 500 may be a flat plate structure or an arch structure, etc., so that the sound guide channel 102 with a different cross-sectional shape and cross-sectional area can be obtained, which can adjust the capability of the sound guide channel 102 to change the sound wave of the speaker rear cavity 320, thereby facilitating the positive superposition of the sound wave in the speaker front cavity 310 and the sound wave in the speaker rear cavity 320.

In an alternative embodiment, the first end of the sound guide channel 102 and the second end of the sound guide channel 102 are located on opposite sides of the speaker front cavity 310, respectively. Specifically, the first end of the sound guide channel 102 and the second end of the sound guide channel 102 are respectively located at two opposite sides of the speaker front cavity 310 along the length direction thereof, and at this time, the sound guide channel 102 extends approximately along the plane of the display screen of the electronic device. In this embodiment, the two ends of the sound guide channel 102 are respectively located at two opposite sides of the speaker front cavity 310, so that the length of the sound guide channel 102 can be increased, and the capability of the sound guide channel 102 to change the phase of the sound wave of the speaker rear cavity 320 can be improved, so that the phase of the sound wave in the speaker rear cavity 320 is more approximate to the phase of the sound wave in the speaker front cavity 310, and the effect of forward superposition of the two is enhanced. Of course, the first end of the sound guide channel 102 and the second end of the sound guide channel 102 may be located at two adjacent sides of the speaker front cavity 310, or at the same side of the speaker front cavity 310.

In an alternative embodiment, the speaker housing 100 includes a housing 110, where the housing 110 includes a housing body 111 and a top cover 112, and the top cover 112 covers the housing body 111 and is detachably connected to the housing body 111, and the sound guide channel 102 is disposed on the top cover 112. In this embodiment, the housing 110 includes a housing body 111 and a top cover 112, the speaker main body 200 can be disposed in the housing body 111, the top cover 112 is detachably connected with the housing body 111, and the top cover 112 can be detached from the housing body 111, and then the sound guide channel 102 is processed on the top cover 112, so that the sound guide channel 102 is convenient to process.

Further, the speaker housing 100 further includes a support member 120, the support member 120 is disposed in the housing body 111, the support member 120 is disposed around the outer circumferential surface of the speaker main body 200 and is connected to the top cover 112, and the speaker main body 200, the support member 120, the housing body 111 and the top cover 112 surround the speaker front cavity 310, so that the speaker rear cavity 320 is disposed around the speaker front cavity 310, thereby achieving the purpose of increasing the volume of the speaker rear cavity 320. Optionally, the top cover 112 includes a front cavity cover 113 and a rear cavity cover 114, the supporting member 120 is connected with the front cavity cover 113, and the speaker main body 200, the supporting member 120, the shell body 111 and the front cavity cover 113 surround to form a speaker front cavity 310, the rear cavity cover 114 surrounds the outer peripheral surface of the front cavity cover 113, and the edge of the rear cavity cover 114 close to the front cavity cover 113 is detachably connected with the supporting member 120, the rear cavity cover 114 is detachably connected with the shell body 111, and the sound guide channel 102 is provided on the rear cavity cover 114, so that the sound guide channel 102 can be processed on the rear cavity cover 114 after the rear cavity cover 114 is detached from the shell body 111 and the supporting member 120, so that the sound guide channel 102 is more convenient to process.

The embodiment of the application also discloses an electronic device, which comprises the loudspeaker according to any one of the embodiments, and further comprises a main board upper cover 800, wherein the loudspeaker housing 100 has a matching surface facing the main board upper cover 800, the sound guide channel 102 is arranged on the matching surface, and the sound guide channel 102 is positioned on one side of the matching surface away from the main board upper cover 800 and facing the main board upper cover 800. Specifically, the sound guide channel 102 is located on a side of the mating surface away from the motherboard upper cover 800, so that the mating surface of the speaker housing 100 can be attached to the motherboard upper cover 800, and the sound guide channel 800 is formed by using the motherboard upper cover 800 and the speaker housing 100, without using a sealing member such as the sealing sheet 500 to form the sound guide channel 800, so that the volume of the electronic device can be reduced. Of course, the present embodiment may also be combined with a solution in which the speaker includes the sealing sheet 500, and at this time, the main board upper cover 800 and the sealing sheet 500 are attached together to form the sound guide channel 800, and the main board upper cover 800 may press the sealing sheet 500, so that the sealing effect of the sealing sheet 500 is better.

Optionally, the electronic device includes a middle frame 700, where a sound outlet 710 is provided on the middle frame 700, the sound outlet 710 may be communicated with the sound outlet 101, and sound waves emitted by the speaker may be propagated to an external environment through the sound outlet 710; in the case that other structural members are arranged between the middle frame 700 and the loudspeaker, sound transmission through holes can be formed in other structural members, and the sound outlet channel 101 and the sound outlet hole 710 can be communicated through the sound transmission through holes; further, at least one of the outlet of the sound outlet passage 101 and the outlet of the sound transmission through hole is provided with a second dust-proof screen 600.

The foregoing embodiments of the present application mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in view of brevity of line text, no further description is provided herein. The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims

1. A loudspeaker is characterized by comprising a loudspeaker shell (100) and a loudspeaker main body (200), wherein the loudspeaker main body (200) is arranged in the loudspeaker shell (100), a loudspeaker front cavity (310) and a loudspeaker rear cavity (320) are formed between the loudspeaker main body (200) and the loudspeaker shell (100),

the loudspeaker housing (100) is further provided with a sound guide channel (102), a first end of the sound guide channel (102) is communicated with the loudspeaker rear cavity (320), a second end of the sound guide channel (102) is communicated with the loudspeaker front cavity (310), and the sound guide channel (102) is used for changing the phase of sound waves in the loudspeaker rear cavity (320) so that the sound waves in the loudspeaker front cavity (310) are overlapped with the sound waves in the loudspeaker rear cavity (320).

2. The loudspeaker of claim 1, wherein the sound guide channel (102) is configured to change a phase of sound waves in the loudspeaker back chamber (320) such that sound waves in the loudspeaker front chamber (310) are superimposed positively with sound waves in the loudspeaker back chamber (320).

3. The loudspeaker of claim 1, wherein sound waves in the loudspeaker back volume (320) are inversed by adjusting structural parameters of the sound guide channel (102);

wherein the structural parameter comprises at least one of a length and a cross-sectional area of the sound guiding channel (102).

4. The loudspeaker of claim 1, wherein the loudspeaker back chamber (320) comprises a filling chamber (321), the filling chamber (321) being filled with particulate matter (322).

5. The speaker as claimed in claim 4, wherein the filling chamber (321) is located at one side of the speaker body (200) in the first direction,

wherein the first direction is perpendicular to the height direction of the speaker.

6. The loudspeaker of claim 4, wherein at least a portion of the filling cavity (321) is located on a side of the loudspeaker body (200) facing away from the loudspeaker front cavity (310).

7. The loudspeaker of claim 4, wherein a first dust screen (400) is provided in the speaker rear chamber (320), the first dust screen (400) and an inner wall of the speaker rear chamber (320) together forming the filling chamber (321).

8. The loudspeaker of claim 7, wherein the first dust screen (400) is located between the particulate matter (322) and the first end of the sound guide channel (102).

9. The loudspeaker of claim 1, further comprising a sealing sheet (500), wherein the loudspeaker housing (100) comprises a housing (110), wherein a receiving space is provided in the housing (110), wherein the loudspeaker body (200) is provided in the receiving space, wherein a partial region of the housing (110) is recessed in a direction towards the receiving space and forms a sound guiding groove with an opening facing away from the receiving space, and wherein the sealing sheet (500) covers the opening of the sound guiding groove to form the sound guiding channel (102).

10. The loudspeaker of claim 1, wherein the first end of the sound guide channel (102) and the second end of the sound guide channel (102) are located on opposite sides of the loudspeaker front chamber (310), respectively.

11. The speaker of claim 1, wherein the speaker housing (100) comprises a shell (110), the shell (110) comprises a shell body (111) and a top cover (112), the top cover (112) covers the shell body (111) and is detachably connected with the shell body (111), and the sound guide channel (102) is provided on the top cover (112).

12. An electronic device comprising a speaker according to any of claims 1 to 11, the electronic device further comprising a motherboard upper cover (800), the speaker housing (100) having a mating surface arranged towards the motherboard upper cover (800), the sound guiding channel (102) being located at a side of the mating surface remote from the motherboard upper cover (800) and facing towards the motherboard upper cover (800).