CN115225747A

CN115225747A - Electronic device

Info

Publication number: CN115225747A
Application number: CN202210672337.1A
Authority: CN
Inventors: 旷亚军
Original assignee: Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
Current assignee: Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
Priority date: 2022-06-14
Filing date: 2022-06-14
Publication date: 2022-10-21

Abstract

The application discloses an electronic device, which comprises a machine body and a loudspeaker module, wherein the machine body comprises a middle frame and a display screen, the middle frame is positioned on the backlight side of the display screen, the backlight side of the display screen and the light-emitting side of the display screen are arranged in a back-to-back mode, and the middle frame is provided with an installation groove; the loudspeaker module is arranged in the mounting groove and is provided with a front sound cavity and a rear sound cavity; the machine body is provided with a sealed expansion cavity, the expansion cavity is communicated with the back sound cavity, the expansion cavity is positioned on one side of the middle frame close to the display screen, and/or the expansion cavity is positioned on one side of the middle frame far away from the display screen. The dilatation cavity can give the speaker module utilization for the dilatation cavity has the function in back sound chamber equally, is equivalent to the volume in back sound chamber and obtains enlarging, can be on the basis of the tone quality that promotes the speaker module, need not to enlarge the volume of speaker module, thereby can avoid the speaker module further to compress the installation space of devices such as interior battery of electronic equipment and lead to electronic equipment's performance degradation.

Description

Electronic equipment

Technical Field

The present application relates to the field of electronic technology, and in particular, to an electronic device.

Background

In electronic equipment such as cell-phone and panel computer that have the speaker module, in order to promote the tone quality of speaker module, can generally do the volume of the back sound chamber of speaker module among the electronic equipment great, this volume that can lead to the speaker module enlarges for the installation space of devices such as battery in the electronic equipment can further be compressed to the speaker module, thereby leads to the performance degradation of electronic equipment.

Disclosure of Invention

The application provides an electronic equipment can be on the basis of the tone quality that promotes the speaker module, need not to enlarge the volume of speaker module to can avoid the speaker module further to compress the installation space of devices such as interior battery of electronic equipment and lead to electronic equipment's performance degradation.

An electronic device, comprising: the body comprises a middle frame and a display screen, wherein the middle frame is positioned on the backlight side of the display screen, the backlight side of the display screen and the light-emitting side of the display screen are arranged in a back-to-back mode, and the middle frame is provided with an installation groove; the loudspeaker module is arranged in the mounting groove and is provided with a front sound cavity and a rear sound cavity; the body is provided with a sealed expansion cavity, the expansion cavity is communicated with the rear sound cavity, the expansion cavity is located on one side, close to the display screen, of the middle frame, and/or the expansion cavity is located on one side, far away from the display screen, of the middle frame.

In some embodiments of the present application, the expansion cavity includes a first cavity located between the display screen and the middle frame. Can seal etc. operation in order to form first cavity through the clearance to original between display screen and the center, can be on the unchangeable basis of electronic equipment's size, the dilatation cavity is formed in the space in the make full use of electronic equipment.

In some embodiments of this application, the display screen with be provided with the cotton body of sealed bubble between the center, the cotton body of sealed bubble encircles first cavity sets up, the display screen with pass through between the center sealed cotton body sealing connection of bubble. The bubble is cotton to have the high density, the characteristics of low rigidity and high resilience, the leakproofness of first cavity can be promoted to the characteristic of high density, the characteristics of low rigidity can avoid display screen and the cotton body contact of sealed bubble to lead to the display screen to damage, the characteristics of high resilience make the cotton body of sealed bubble have good compressive capacity and reply performance, thereby it leads to sealed inefficacy to prevent that the user from leading to the cotton body of sealed bubble to damage when pressing the display screen too big pressure, and can make the display screen reply normal position fast after the user stops pressing the display screen.

In some embodiments of the present application, the middle frame comprises: a rear housing having the mounting groove; the front shell is positioned between the rear shell and the display screen, the display screen is connected with the front shell in a sealing mode, and the first cavity is formed between the display screen and the front shell. Utilize the backshell to provide the protection for the speaker module, the shell separates speaker module and display screen before can utilizing simultaneously, prevents that speaker module and display screen direct contact from influencing the normal work of display screen.

In some embodiments of the present application, a first through hole is disposed on the front shell, the rear sound cavity is communicated with the first cavity through the first through hole, and an opening area of the first through hole is greater than 4 square millimeters. Guarantee that the gas in the back sound chamber can circulate unimpededly with the gas in the first cavity to realize that first cavity plays the effect of carrying out the dilatation to the back sound chamber.

In some embodiments of the present application, the body further comprises: the frame is located the center is close to one side of display screen and with the center is connected, the frame encircles the display screen sets up, the side of display screen with frame sealing connection. Can play the effect of secondary seal to first cavity, even sealed the inefficacy between display screen and the center, the sealed of first cavity still can be guaranteed to the side of display screen and the sealed between the frame.

In some embodiments of the present application, the body further comprises: the rear cover is located one side of the middle frame far away from the display screen, and the capacity expansion cavity comprises a second cavity located between the rear cover and the middle frame. The second cavity can be formed by sealing the original gap between the rear cover and the middle frame and the like, the volume of the expansion cavity can be further increased on the basis that the size of the electronic equipment is not changed, and the volume of the rear sound cavity is equivalent to be further expanded.

In some embodiments of the present application, the speaker module includes: the box body is arranged in the mounting groove and provided with a containing groove, a first end of the box body faces the display screen and is provided with a first opening communicated with the containing groove, and the first end of the box body is hermetically connected with the middle frame so as to form the rear sound cavity by being surrounded with the middle frame; the loudspeaker is installed in the accommodating groove and connected with the box body. The first opening is arranged at the first end of the box body, so that the space occupied by the plate body at the first end of the box body can be reduced, and the volume of the rear sound cavity is further increased.

In some embodiments of the present application, the second end of the box body faces away from the display screen and has a second opening communicated with the accommodating groove, and the second cavity is communicated with the back sound cavity through the second opening.

In some embodiments of the present application, a first sealing element is disposed between the first end of the box body and the middle frame, and the first end of the box body is connected to the middle frame in a sealing manner through the first sealing element. The sealing performance of the rear sound cavity is enhanced.

In some embodiments of the present application, the speaker module further has a sound outlet channel communicated with the front sound cavity, and a sound outlet communicated with the sound outlet channel is disposed on a side surface of the middle frame. So that the sound outlet can avoid the expansion cavity.

The beneficial effect of this application does: the capacity expansion cavity is communicated with the back sound cavity of the loudspeaker module and can be used by the loudspeaker module, so that the capacity expansion cavity has the function of the back sound cavity, the capacity of the back sound cavity is enlarged, the volume of the loudspeaker module does not need to be enlarged on the basis of improving the tone quality of the loudspeaker module, and the situation that the performance of the electronic equipment is reduced due to the fact that the loudspeaker module further compresses the installation space of devices such as a battery in the electronic equipment can be avoided; and, compare in setting up the dilatation cavity in the direction of the thickness direction of perpendicular to display screen, set up the dilatation cavity in the direction that is close to and/or keeps away from the display screen through the center in this application, the volume that can supply to set up the dilatation cavity in the thickness direction of display screen is great among the electronic equipment to can also utilize the clearance between each part of arranging on the thickness direction of display screen to act as the dilatation cavity, it is more obvious to the promotion of the tone quality of speaker module.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or related technologies of the present application, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

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

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

FIG. 3 is an enlarged schematic view at A in FIG. 2;

fig. 4 is a schematic diagram illustrating a relationship between a sound pressure level of a rear cavity of a speaker module and a resonant frequency according to an embodiment of the present invention.

Reference numerals are as follows:

10. a body; 11. a middle frame; 111. mounting grooves; 112. a rear housing; 112a, a first end face; 113. a front housing; 113a, a first through hole; 12. a display screen; 13. a capacity expansion cavity; 131. a first cavity; 132. a second cavity; 14. a frame; 15. a rear cover; 16. a sound outlet; 20. a speaker module; 21. a front sound cavity; 22. a rear sound cavity; 23. a box body; 231. accommodating grooves; 232. a first opening; 233. a second opening; 234. a main body; 235. a sound blocking plate; 24. a speaker; 241. a sound membrane; 242. a speaker kernel; 31. sealing the foam body; 32. double-sided colloid; 33. a first seal member; 34. a second seal member; 35. a third seal member; 40. a sound outlet channel; 51. a first curve; 52. a second curve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The application provides an electronic equipment to solve in the correlation technique for promoting the tone quality of speaker module, generally can do the volume of the back sound chamber of the speaker module in the electronic equipment great, the installation space of devices such as battery in the electronic equipment can further be compressed to the speaker module, thereby leads to the problem of electronic equipment's performance decline.

Specifically, as shown in fig. 1 to 3, the electronic device includes a body 10 and a speaker module 20, and the electronic device may be a mobile phone, a tablet computer, a camera, a multimedia player, an e-book reader, a personal computer, a notebook computer, a vehicle-mounted device, a wearable device, and the like. The embodiment shown in fig. 1 is described by taking the electronic device as a mobile phone as an example.

Wherein, organism 10 includes center 11 and display screen 12, center 11 is located the side in a poor light of display screen 12, the side in a poor light of display screen 12 with the light-emitting side of display screen 12 sets up dorsad, center 11 has mounting groove 111. It should be noted that the middle frame 11 is used for providing support for the display screen 12;

the Display 12 may be an LCD (Liquid Crystal Display), an OLED (Organic Light-Emitting Diode), an AMOLED (Active-matrix Organic Light-Emitting Diode, or Active-matrix Organic Light-Emitting Diode), a FLED (flexible Light-Emitting Diode), a Mini LED, a Micro OLED, etc., the Display 12 is not limited to the 2D (Dimensions) Display shown in fig. 1, and the Display 12 may also be a 2.5D curved panel or a 3D curved panel; the display screen 12 has a display function, and a side of the display screen 12 on which the picture is displayed is a light emitting side of the display screen 12, and certainly, the display screen 12 may also be integrated with a touch function, that is, the display screen 12 is a touch display screen.

A speaker module 20 is mounted in the mounting groove 111, and the speaker module 20 has a front sound cavity 21 and a rear sound cavity 22; the speaker module 20 may be electrically connected to a control module of the electronic device, and after the speaker module 20 receives the audio signal transmitted by the control module, the speaker module can vibrate to sound according to the received audio signal, so as to realize sound production of the electronic device.

The body 10 has a sealed expansion cavity 13, the expansion cavity 13 is communicated with the rear sound cavity 22, the expansion cavity 13 is located on one side of the middle frame 11 close to the display screen 12, and/or the expansion cavity 13 is located on one side of the middle frame 11 far away from the display screen 12.

It can be understood that the expansion cavity 13 may be disposed only on one side of the middle frame 11 close to the display screen 12 or one side of the middle frame 11 far from the display screen 12, or both the expansion cavity 13 may be disposed on one side of the middle frame 11 close to the display screen 12 and one side of the middle frame 11 far from the display screen 12. Through the dilatation cavity 13 that sets up the backsound chamber 22 intercommunication with speaker module 20 in this application, dilatation cavity 13 can give speaker module 20 and utilize, make dilatation cavity 13 have backsound chamber 22's function equally, the volume that is equivalent to backsound chamber 22 obtains enlarging, can be on the especially low frequency tone quality's of tone quality basis of promotion speaker module 20, need not to enlarge speaker module 20's volume, thereby can avoid speaker module 20 to further compress the installation space of devices such as interior batteries of electronic equipment and lead to electronic equipment's performance degradation.

It should be noted that, compared with the method of enlarging the volume of the speaker module 20 in the direction perpendicular to the thickness direction of the display screen 12 to enlarge the volume of the back sound cavity 22, the method of enlarging the volume of the speaker module 20 in the electronic device in the direction perpendicular to the thickness direction of the display screen 12 is smaller, which may result in a smaller degree of enlargement of the volume of the back sound cavity 22, and may improve the sound quality of the speaker module 20 to a minimum, and may also affect the arrangement of other parts in the electronic device; in the present application, by arranging the expansion cavity 13 in the direction (the thickness direction of the display screen in fig. 2) in which the middle frame 11 is close to and/or away from the display screen 12, the volume of the expansion cavity 13 that can be arranged in the electronic device in the thickness direction of the display screen 12 is relatively large, and gaps between components arranged in the thickness direction of the display screen 12 can also be used as the expansion cavity 13, so that the improvement of the tone quality of the speaker module 20 is more obvious.

Referring to fig. 2 and 3, in some embodiments of the present disclosure, the expansion cavity 13 includes a first cavity 131 between the display screen 12 and the middle frame 11. It should be noted that, in the related art, in order to provide better support for the display screen 12, the middle frame 11 is generally made of a material with a relatively high hardness, such as an aluminum alloy or a steel material, and in order to avoid damage to the display screen 12 caused by contact between the display screen 12 and the middle frame 11, a certain gap is generally reserved between the display screen 12 and the middle frame 11, in this embodiment, the first cavity 131 may be formed by sealing the original gap between the display screen 12 and the middle frame 11, and the expansion cavity 13 may be formed by fully utilizing the space in the electronic device on the basis of the unchanged size of the electronic device.

Further, display screen 12 with be provided with the cotton body 31 of sealed bubble between the center 11, the cotton body 31 of sealed bubble encircles first cavity 131 sets up, display screen 12 with pass through between the center 11 the cotton body 31 sealing connection of sealed bubble. Among them, the sealing foam body 31 may preferably be a polyurethane foam. It can be understood that, can seal first cavity 131 through sealed bubble cotton 31, the bubble is cotton to have high density, the leakproofness of low hardness and high resilience, the characteristic of high density can promote first cavity 131, the characteristics of low hardness can avoid display screen 12 and sealed bubble cotton 31 hard contact to lead to display screen 12 to damage, the characteristics of high resilience make sealed bubble cotton 31 have good compressive capacity and resilience performance, thereby prevent that the too big sealed bubble cotton 31 that leads to of pressure from damaging and leading to sealed inefficacy when the user presses display screen 12, and can make display screen 12 reply the normal position fast after the user stops pressing display screen 12.

Further, the sealing foam 31 may be located at an edge of the display 12 to increase the volume of the first cavity 131.

With continued reference to fig. 2 and 3, in some embodiments of the present application, the middle frame 11 includes a rear shell 112 and a front shell 113, the rear shell 112 having the mounting groove 111; the front shell 113 is located between the rear shell 112 and the display screen 12, the display screen 12 is hermetically connected with the front shell 113, and the first cavity 131 is formed between the display screen 12 and the front shell 113. It can be understood that the rear case 112 is utilized to provide protection for the speaker module 20, and the front case 113 can be utilized to separate the speaker module 20 from the display screen 12, so as to prevent the speaker module 20 from directly contacting the display screen 12 to affect the normal operation of the display screen 12.

The front shell 113 and the rear shell 112 are preferably formed respectively and then connected and assembled, and the front shell 113 and the rear shell 112 can be connected in a welding, gluing, threaded connection, clamping or threaded connection mode and the like, so that the front shell 113 and the rear shell 112 can be conveniently installed in the electronic equipment; of course, the front housing 113 and the rear housing 112 may be integrally formed according to actual requirements.

More specifically, a first through hole 113a may be disposed on the front shell 113, the back sound cavity 22 is communicated with the first cavity 131 through the first through hole 113a, and an opening area of the first through hole 113a is greater than 4 square millimeters, so as to ensure that gas in the back sound cavity 22 and gas in the first cavity 131 can circulate without obstruction, thereby implementing an effect of expanding the volume of the back sound cavity 22 by the first cavity 131.

With continued reference to fig. 2 and fig. 3, in an embodiment of the present application, the machine body 10 further includes a frame 14, the frame 14 is located on a side of the middle frame 11 close to the display screen 12 and is connected to the middle frame 11, the frame 14 is disposed around the display screen 12, and a side surface of the display screen 12 is connected to the frame 14 in a sealing manner. Frame 14 can enclose with center 11 and close and form a protection chamber, display screen 12 is located the protection intracavity, utilize frame 14 to provide the protection for display screen 12, simultaneously display screen 12's side can be through sealed glue or bubble cotton etc. and frame 14 sealing connection, can play the effect of secondary seal to first cavity 131, even sealed inefficacy between display screen 12 and center 11, sealed between display screen 12's side and the frame 14 still can guarantee the sealed of first cavity 131.

Specifically, the frame 14 is located on one side of the front shell 113 far away from the rear shell 112 and connected with the front shell 113, the frame 14 and the front shell 113 can be connected and assembled after being respectively formed, and the frame 14 and the front shell 113 can also be integrally formed.

With continued reference to fig. 2 and 3, in some embodiments of the present application, the machine body 10 further includes a rear cover 15, the rear cover 15 is located on a side of the middle frame 11 away from the display screen 12, and the expansion cavity 13 may further include a second cavity 132 located between the rear cover 15 and the middle frame 11. The rear cover 15 is used for covering one side of the middle frame 11 far away from the display screen 12, so as to protect devices such as the speaker module 20 on the middle frame 11, in the related art, in order to avoid the rear cover 15 being too close to the middle frame 11, and in order to reserve a certain expansion space for the devices such as the middle frame 11, a certain gap is generally reserved between the rear cover 15 and the middle frame 11, in this embodiment, the second cavity 132 is formed by sealing the original gap between the rear cover 15 and the middle frame 11, on the basis that the size of the electronic device is not changed, the volume of the expansion cavity 13 is further increased, and the volume equivalent to the volume of the rear sound cavity 22 is further expanded.

Wherein, can set up two-sided colloid 32 between back lid 15 and the center 11, two-sided colloid 32 encircles the setting of second cavity 132, and back lid 15 passes through two-sided adhesive tape sealing connection with center 11, utilizes two-sided colloid 32 to seal second cavity 132. Further, the double-sided adhesive 32 may be disposed at an edge of the display 12 to increase the volume of the first cavity 131.

More specifically, the rear cover 15 is located on a side of the rear casing 112 away from the front casing 113, the second cavity 132 is formed between the rear cover 15 and the rear casing 112, the double-sided adhesive 32 is located between the rear cover 15 and the rear casing 112, and the rear cover 15 and the rear casing 112 are hermetically connected by the double-sided adhesive tape.

With continued reference to fig. 2 and 3, the speaker module 20 may include a cabinet 23 and a speaker 24; the box body 23 is mounted in the mounting groove 111, the box body 23 has a receiving groove 231, a first end of the box body 23 faces the display screen 12 and has a first opening 232 communicated with the receiving groove 231, and the first end of the box body 23 is connected with the middle frame 11 in a sealing manner so as to form the back sound cavity 22 by enclosing with the middle frame 11; the speaker 24 is mounted in the receiving groove 231 and connected to the cabinet 23. It should be noted that the back sound cavity 22 is a part of the receiving groove 231, and the first opening 232 is disposed at the first end of the box 23, so that the space occupied by the plate body at the first end of the box 23 can be reduced, and the volume of the back sound cavity 22 can be further increased.

Further, a first sealing element 33 is arranged between the first end of the box body 23 and the middle frame 11, the first end of the box body 23 is connected with the middle frame 11 in a sealing mode through the first sealing element 33, so that the sealing performance of the rear sound cavity 22 is enhanced, and the first sealing element 33 can be made of sealing glue or foam and the like.

Furthermore, the first end of the box 23 is connected to the front shell 113 through the first sealing element 33 in a sealing manner, so as to form the rear sound cavity 22 by enclosing with the front shell 113, and in a direction parallel to the light emitting direction of the display screen 12 (the thickness direction of the electronic device in fig. 2), the first through hole 113a at least partially coincides with the first opening 232, so that the rear sound cavity 22 can be communicated with the first cavity 131 through the first opening 232 and the first through hole 113 a. Furthermore, in a direction parallel to the light emitting direction of the display 12, the first opening 232 covers the first through hole 113a to ensure the sealing of the first cavity 131 and the rear sound cavity 22, so as to prevent the first cavity 131 and the rear sound cavity 22 from communicating with the external environment due to the part of the first through hole 113a located outside the first opening 232.

With continued reference to fig. 2 and 3, in some embodiments of the present application, the second end of the casing 23 faces away from the display screen 12 and has a second opening 233 communicating with the receiving groove 231, and the second cavity 132 communicates with the back sound cavity 22 through the second opening 233.

The opening area of the second opening 233 is greater than 4 square millimeters, so that it is ensured that the gas in the back sound cavity 22 and the gas in the second cavity 132 can flow without resistance, and the second cavity 132 can expand the back sound cavity 22.

Specifically, as shown in fig. 2 and fig. 3, the speaker 24 includes a sound membrane 241 and a speaker core 242, the speaker core 242 is located on a side of the sound membrane 241 away from the rear cover 15, and the speaker core 242 is used for driving the sound membrane 241 to vibrate and generate sound; the case 23 includes a main body 234 having a receiving groove 231, and a sound blocking plate 235 located between the diaphragm 241 and the rear cover 15 and connected to the main body 234, the diaphragm 241 and the rear cover 15 forming a front sound chamber 21 therebetween.

More specifically, an end of the middle frame 11 away from the display screen 12 is a first end face 112a, the mounting groove 111 penetrates through the first end face 112a, the second cavity 132 includes a first portion located between the middle frame 11 and the rear cover 15 and a second portion located between the sound blocking plate 235 and the rear cover 15, and the second opening 233 penetrates through the main body 234 to communicate with the rear sound cavity 22 and the second cavity 132.

The sound blocking plate 235 can be connected to the wall of the mounting groove 111 through the second sealing member 34 to ensure the sealing performance of the second cavity 132, and the second sealing member 34 can be made of sealant or foam.

The main body 234 and the wall of the mounting groove 111 can be hermetically connected by the third sealing member 35 to perform a secondary sealing of the rear sound cavity 22, and even if the sealing between the first end of the box 23 and the front shell fails, the third sealing member 35 can still ensure the sealing performance of the rear sound cavity 22. The third sealing member 35 may be made of sealant or foam.

With continued reference to fig. 2 and fig. 3, the speaker module 20 further has a sound outlet channel 40, a sound outlet 16 communicated with the sound outlet channel 40 is disposed on a side surface of the middle frame 11, and the sound outlet 16 is disposed in the side surface of the middle frame 11, so that the sound outlet 16 avoids the expansion cavity 13. The front sound cavity 21 is communicated with the sound outlet 16 through the sound outlet channel 40, and sound generated by the front sound cavity 21 is transmitted to the outside of the electronic device through the sound outlet 16, so that the electronic device generates sound.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating a Sound Pressure Level (SPL) of the rear sound cavity 22 of the speaker module 20 as a function of a resonance frequency (frequency) according to an embodiment of the present invention, where an abscissa represents the resonance frequency in hertz (Hz) and an ordinate represents the sound pressure level in decibels (dB); fig. 4 shows that the first curve 51 is a graph of the sound pressure level as a function of the resonant frequency when the rear sound cavity 22 is not connected to the first cavity 131 and the second cavity 132, and the second curve 52 is a graph of the sound pressure level as a function of the resonant frequency when the rear sound cavity 22 is connected to the first cavity 131 and the second cavity 132, as can be seen from fig. 4, after the rear sound cavity 22 is connected to the first cavity 131 and the second cavity 132, the resonance low frequency bandwidth is increased and the resonance low frequency loudness is greatly improved at the lowest resonance frequency of the rear sound cavity 22, for example, when the resonance frequency is 700 hz, the sound pressure level when the rear sound cavity 22 is not connected to the first cavity 131 and the second cavity 132 is 90 db, and when the rear sound cavity 22 is connected to the first cavity 131 and the second cavity 132 is 100 db, the low frequency is expanded by 10 db, and the low frequency effect is significantly enhanced.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electronic device, comprising:

the body comprises a middle frame and a display screen, wherein the middle frame is positioned on the backlight side of the display screen, the backlight side of the display screen and the light-emitting side of the display screen are arranged in a back-to-back manner, and the middle frame is provided with an installation groove;

the loudspeaker module is arranged in the mounting groove and is provided with a front sound cavity and a rear sound cavity;

the body is provided with a sealed expansion cavity, the expansion cavity is communicated with the rear sound cavity, the expansion cavity is located on one side, close to the display screen, of the middle frame, and/or the expansion cavity is located on one side, far away from the display screen, of the middle frame.

2. The electronic device of claim 1, wherein the flash chamber comprises a first chamber between the display screen and the bezel.

3. The electronic device of claim 2, wherein a sealing foam body is arranged between the display screen and the middle frame, the sealing foam body surrounds the first cavity, and the display screen is connected with the middle frame in a sealing manner through the sealing foam body.

4. The electronic device of claim 2, wherein the middle frame comprises:

a rear housing having the mounting groove;

the front shell is located between the rear shell and the display screen, the display screen is connected with the front shell in a sealing mode, and the first cavity is formed between the display screen and the front shell.

5. The electronic device according to claim 4, wherein a first through hole is provided on the front housing, the rear sound cavity is communicated with the first cavity through the first through hole, and an opening area of the first through hole is larger than 4 square millimeters.

6. The electronic device of claim 2, wherein the body further comprises:

the frame is located the center is close to one side of display screen and with the center is connected, the frame encircles the display screen sets up, the side of display screen with frame sealing connection.

7. The electronic device of any of claims 1-6, wherein the body further comprises:

the rear cover is located one side of the middle frame, which is far away from the display screen, and the expansion cavity comprises a second cavity which is located between the rear cover and the middle frame.

8. The electronic device of claim 7, wherein the speaker module comprises:

the box body is arranged in the mounting groove, the box body is provided with a containing groove, the first end of the box body faces the display screen and is provided with a first opening communicated with the containing groove, and the first end of the box body is hermetically connected with the middle frame so as to form the rear sound cavity by being surrounded with the middle frame;

the loudspeaker is installed in the accommodating groove and connected with the box body.

9. The electronic device of claim 8, wherein the second end of the case faces away from the display screen and has a second opening communicating with the receiving groove, and the second cavity communicates with the rear sound cavity through the second opening.

10. The electronic device of claim 8, wherein a first sealing member is disposed between the first end of the box body and the middle frame, and the first end of the box body is connected to the middle frame through the first sealing member.

11. The electronic device of claim 1, wherein the speaker module further has a sound outlet channel communicated with the front sound cavity, and a sound outlet communicated with the sound outlet channel is disposed on a side surface of the middle frame.