CN110300359B

CN110300359B - Box sound cavity fixed knot constructs, box sound cavity and mobile terminal

Info

Publication number: CN110300359B
Application number: CN201810240557.0A
Authority: CN
Inventors: 陈佳
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-03-22
Filing date: 2018-03-22
Publication date: 2021-11-09
Anticipated expiration: 2038-03-22
Also published as: CN110300359A

Abstract

The application relates to a box sound cavity fixed knot constructs, box sound cavity and mobile terminal, and box sound cavity fixed knot constructs and is used for connecting mobile terminal's box sound cavity on mobile terminal's preceding shell, has seted up the through-hole on the preceding shell. The box sound cavity fixing structure comprises a lug, a boss and a threaded fastener. The lug is used for being connected with the front shell and is provided with a first connecting hole; the boss is used for being connected with the box sound cavity, and a second connecting hole is formed in the boss; the threaded fastener is arranged in the first connecting hole and the second connecting hole in a penetrating mode, and the lug is fixedly connected with the boss through the threaded fastener. Above-mentioned box sound chamber fixed knot constructs, in mobile terminal's thickness direction, the through-hole runs through preceding shell, need not to set up other bearing structure on the preceding shell in order to support box sound chamber to can reduce box sound chamber's connection structure shared space in mobile terminal's thickness direction, be favorable to mobile terminal's inner space's make full use of.

Description

Box sound cavity fixed knot constructs, box sound cavity and mobile terminal

Technical Field

The application relates to the technical field of mobile terminals, in particular to a box sound cavity fixing structure, a box sound cavity and a mobile terminal.

Background

A box sound cavity is generally arranged inside a mobile terminal such as a mobile phone and a palm computer, and is used for enhancing the sound output effect of the mobile terminal. The box sound cavity and the peripheral connection structure thereof generally occupy a large space, which is not favorable for the full utilization of the internal space of the mobile terminal.

Disclosure of Invention

The embodiment of the application provides a box sound cavity fixing structure, a box sound cavity and a mobile terminal, and aims to solve the problem that the box sound cavity and a peripheral connecting structure thereof occupy a large space.

A box sound cavity fixed knot constructs for connect mobile terminal's box sound cavity on mobile terminal's preceding shell, offer on the preceding shell and be used for acceping the through-hole in box sound cavity, box sound cavity fixed knot constructs and includes:

a lug for connecting with the front shell; the lug protrudes outwards from the hole wall of the through hole; the lug is provided with a first connecting hole;

the boss is used for being connected with the box sound cavity, and a second connecting hole is formed in the boss; and

and the threaded fastener penetrates through the first connecting hole and the second connecting hole, and the lug is fixedly connected with the boss through the threaded fastener.

In one embodiment, the lug is integrally formed with the front shell.

In one embodiment, the number of the lugs is multiple, and the lugs are distributed on the wall of the through hole at intervals; the number of bosses is the same as the number of lugs.

In one embodiment, the box sound cavity fixing structure further includes a hot-melting nut made of a metal material, the hot-melting nut is disposed in the first connecting hole, and the threaded fastener is screwed with the hot-melting nut to fixedly connect the lug and the boss.

A box sound cavity is used for being accommodated in a through hole in a front shell of a mobile terminal and comprises a supporting piece, a loudspeaker, a flexible circuit board, a cover plate assembly and the box sound cavity fixing structure, wherein a boss is connected to the periphery of the supporting piece, an accommodating cavity is formed in the supporting piece, and the loudspeaker is accommodated in the accommodating cavity; the flexible circuit board is in communication connection with the loudspeaker, the cover plate assembly is covered on the loudspeaker, and the flexible circuit board is located between the cover plate assembly and the supporting piece.

In one embodiment, the boss is integrally formed with the support.

In one embodiment, the cover plate assembly includes a reinforcement and a connector, the reinforcement is made of metal, the connector is made of plastic, and the connector is located on one side of the reinforcement facing the speaker; the box sound chamber still includes the adhesive linkage, the adhesive linkage is located the connecting piece orientation one side of speaker, the flexible line way board passes through the adhesive linkage with the connecting piece is connected.

In one embodiment, the box sound cavity further comprises a buffer member, the buffer member is disposed between the connecting member and the speaker, and the connecting member can press the buffer member, so that the buffer member presses the speaker.

In one embodiment, the connecting member is welded to the supporting member, and the welding is ultrasonic welding.

A mobile terminal comprises a front shell and the box sound cavity, wherein the box sound cavity is connected to the front shell; the front housing has a first surface and the cover assembly has a second surface, the first surface and the second surface being on a same side of the front housing.

In one embodiment, the lug includes a third surface and a fourth surface which are opposite to each other, and the first connection hole penetrates through the third surface and the fourth surface; the boss comprises a fifth surface and a sixth surface which are arranged in an opposite mode, the second connecting hole penetrates through the fifth surface and the sixth surface, and the third surface and the sixth surface are arranged oppositely and can be attached to each other; the third surface is lower than the side where the first surface is located.

In one embodiment, the fifth surface is lower than the second surface, and the end of the threaded fastener remote from the lug is lower than the second surface.

In one embodiment, a bump is arranged on the box sound cavity, the bump and the support member are integrally formed, and a sound outlet is formed on the bump; the front shell is provided with a containing groove and an external sound hole, the containing groove is communicated with the external sound hole, and the convex block is embedded in the containing groove so that the sound outlet is communicated with the external sound hole.

According to the box sound cavity fixing structure, the box sound cavity and the mobile terminal, the through hole used for accommodating the box sound cavity is formed in the front shell, the lug protrudes out of the hole wall of the through hole, and the fixed connection between the box sound cavity and the front shell can be achieved after the lug and the boss are connected through the threaded fastener. In mobile terminal's thickness direction, the through-hole runs through preceding shell, need not to set up other bearing structure on the preceding shell in order to support box sound chamber to can reduce the shared space of connection structure in mobile terminal's thickness direction in box sound chamber, the space of saving can be used for holding mobile terminal's battery, consequently is favorable to increasing the volume of battery and then improves the electric quantity of battery. The fixing structure of the box sound cavity not only simplifies the connection structure of the box sound cavity and the front shell, but also realizes the full utilization of the internal space of the mobile terminal.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described 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 the drawings without creative efforts.

FIG. 1 is an exploded view of a mobile terminal in one embodiment;

fig. 2 is a perspective view of a front case of the mobile terminal shown in fig. 1;

FIG. 3 is a perspective view of a box sound cavity of the mobile terminal shown in FIG. 1;

FIG. 4 is an exploded view of the box sound chamber of FIG. 1;

fig. 5 is an exploded view of the mobile terminal in another embodiment of fig. 1.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As used herein, a "communication terminal" (or simply "terminal") includes, but is not limited to, a device that is configured to receive/transmit communication signals via a wireline connection, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection, and/or another data connection/network, and/or via a wireless interface (e.g., for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and/or another communication terminal). A communication terminal arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; a Personal Communications System (PCS) terminal that may combine a cellular radiotelephone with data processing, facsimile and data communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver.

Referring to fig. 1 and 2, in one embodiment, the mobile terminal 10 is a smart phone, and the mobile terminal 10 includes a front case 100 and a box sound cavity 200. The front case 100 is formed with a through hole 110 for receiving the box sound chamber 200, and the box sound chamber 200 is received in the through hole 110. Referring to fig. 3 and 4 together, in one embodiment, the box sound chamber 200 includes a support member 210, a speaker 220, a flexible wiring board 230, a cover plate assembly 240, and a box sound chamber fixing structure 250. In one embodiment, the supporting member 210 has a receiving cavity 211, and the speaker 220 is received in the receiving cavity 211. One end of the flexible circuit board 230 is communicatively connected to the speaker 220, the other end of the flexible circuit board 230 is communicatively connected to the circuit board of the mobile terminal 10, and the processor of the mobile terminal 10 can control the sound emission of the speaker 220 through the circuit board and the flexible circuit board 230. The cover assembly 240 is placed over the speaker 220 with the flexible wiring board 230 between the cover assembly 240 and the support member 210. The box sound chamber 200 is attached to the front case 100 by a box sound chamber fixing structure 250. In an embodiment, the through hole 110 penetrates the front case 100 in the thickness direction of the mobile terminal 10, and the two ends of the through hole 110 in the thickness direction may not need to be provided with other support structures for supporting the box sound cavity 200.

Specifically, in one embodiment, the front housing 100 is made of plastic, and the front housing 100 can be manufactured by injection molding. A complicated support structure may be formed on the front case 100 by injection molding to mount electronic components, such as a battery module, a circuit board, a display screen, etc., of the mobile terminal 10 on the front case 100 and to enable the electronic components to be reliably positioned inside the mobile terminal 10. Referring to fig. 1, in an embodiment, the front case 100 has a first surface 111, the cover plate assembly 240 has a second surface 241, and the first surface 111 and the second surface 241 are located on the same side of the front case 100. In an embodiment, the side of the front case 100 where the first surface 111 is located may be used for mounting a display screen of the mobile terminal 10, and the side of the front case 100 opposite to the first surface 111 may be used for mounting electronic components such as a battery of the mobile terminal 10. In an embodiment, the mobile terminal 10 may further include a battery cover (not shown) disposed on a side of the front case 100 opposite to the first surface 111. The battery cover may shield electronic components inside the mobile terminal 10 and protect the electronic components inside the mobile terminal 10. In other embodiments, the mobile terminal 10 may also be a palm top computer or a tablet computer.

In one embodiment, box sound cavity securing structure 250 includes a lug 251, a boss 253, and a threaded fastener 255. The lug 251 is used for connecting with the front housing 100, the lug 251 protrudes out of the hole wall of the through hole 110, and the lug 251 is provided with a first connecting hole 257. The boss 253 is used for connecting with the box sound cavity 200, and a second connecting hole 259 is formed on the boss 253. In one embodiment, the boss 253 is located at the outer periphery of the support 210 and corresponds to the position of the lug 251. The threaded fastener 255 is inserted into the first connection hole 257 and the second connection hole 259, and the lug 251 is fixedly connected with the boss 253 through the threaded fastener 255. In one embodiment, the hole wall of the first connection hole 257 of the lug 251 is provided with an internal thread, the outer surface of the threaded fastener 255 is provided with an external thread matching the internal thread of the lug 251, and after the threaded fastener 255 is inserted into the first connection hole 257 and the second connection hole 259, the box sound chamber 200 can be fixedly connected to the housing. In one embodiment, the hole wall of the second connecting hole 259 of the boss 253 may also be provided with internal threads matching the threaded fastener 255.

In one embodiment, the material of the lug 251 is plastic, and the lug 251 is integrally formed with the front housing 100. The structure in which the lugs 251 are integrally formed with the front case 100 facilitates the simplification of the structure of connecting the lugs 251 with the front case 100 and facilitates the molding process of the lugs 251 with the front case 100. In one embodiment, the boss 253 is made of plastic, and the boss 253 and the support 210 of the box sound cavity 200 are integrally formed. The structure of the boss 253 integrally formed with the box sound cavity 200 facilitates the simplification of the structure of connecting the boss 253 with the box sound cavity 200 and facilitates the integral formation of the boss 253 with the box sound cavity 200. In other embodiments, the boss 253 may be formed separately and then fixedly attached to the support member 210 of the box sound chamber 200 by welding or bonding. The lug 251 may be formed separately and then fixedly coupled to the front case 100 by welding or bonding.

In the box sound cavity fixing structure 250, since the front case 100 is provided with the through hole 110 for accommodating the box sound cavity 200, the lug 251 protrudes out of the hole wall of the through hole 110, and the lug 251 and the boss 253 are connected by the threaded fastener 255, so that the box sound cavity 200 and the front case 100 can be fixedly connected. In the thickness direction of the mobile terminal 10, the through hole 110 penetrates through the front case 100, and other supporting structures are not required to be arranged on the front case 100 to support the box sound cavity 200, so that the occupied space of the connecting structure of the box sound cavity 200 in the thickness direction of the mobile terminal 10 can be reduced, the saved space can be used for accommodating the battery of the mobile terminal 10, and the size of the battery is increased, and the electric quantity of the battery is further improved. The above-described fixing structure of the box sound chamber 200 not only simplifies the connection structure of the box sound chamber 200 with the front case 100, but also enables the internal space of the mobile terminal 10 to be fully utilized.

In an embodiment, the number of the lugs 251 may be multiple, and the multiple lugs 251 are spaced on the wall of the through hole 110. The number of bosses 253 is the same as the number of lugs 251. In the embodiment shown in fig. 1, the number of the lugs 251 is four, and the lugs 251 are spaced apart from each other on the wall of the through hole 110 of the front housing 100. In one embodiment, the cross-section of the through-hole 110 is substantially rectangular in shape, wherein two of the lugs 251 are located on one long side of the rectangle and on two corners of the rectangle. The other two lugs 251 are respectively positioned on two short sides of the rectangle, wherein one lug 251 is positioned at one end of the short side of the rectangle, and the other lug 251 is positioned in the middle of the short side of the rectangle. The boss 253 on the support 210 of the box sound chamber 200 is positioned to correspond to the boss 251. The above-described structure of the lug 251 and the boss 253 can simplify the connection structure of the box sound chamber 200 and the front case 100 to reduce the occupied space of the connection structure in the thickness direction of the mobile terminal 10, and can ensure the strength of the connection structure of the box sound chamber 200 and the front case 100.

In an embodiment, the mobile terminal 10 may further include a heat-fusible nut (not shown) made of a metal material, the heat-fusible nut is disposed in the first connection hole 257, and the threaded fastener 255 is screwed with the heat-fusible nut to fixedly connect the lug 251 and the boss 253. Specifically, in an embodiment, after being heated, the hot-melt nut may be inserted into the first connection hole 257, and the temperature of the surface of the hot-melt nut may be utilized to locally melt the lug 251, so that the hot-melt nut and the lug 251 are firmly connected into a whole. Because the heat-fusible nut is made of metal, it can be more reliably connected with the threaded fastener 255 such as a screw. For example, the threaded fastener 255 made of metal is matched with the heat-fusible nut, which is more advantageous than a structure in which the threaded fastener 255 is directly screwed with the lug 251, in that the threaded fastener 255 is screwed into the first connection hole 257 to reliably connect the box sound chamber 200 to the front case 100. The threaded fastener 255 made of metal is matched with the hot-melt nut, which is also beneficial to the detachment of the box sound cavity 200 and the front shell 100, and is further beneficial to the maintenance of the mobile terminal 10. It will be appreciated that a heat staked nut is not required.

Referring to fig. 4, in an embodiment, the cover plate assembly 240 may further include a reinforcement 243 and a connector 245, the reinforcement 243 is made of metal, the connector 245 is made of plastic, and the connector 245 is located on a side of the reinforcement 243 facing the speaker 220. The box sound chamber 200 may further include an adhesive layer (not shown) on a side of the connector 245 facing the speaker 220, and the flexible wiring board 230 is connected to the connector 245 through the adhesive layer. Specifically, in one embodiment, the reinforcement 243 is a thin steel sheet, and the reinforcement 243 is formed by stamping or drawing. The side of the reinforcement 243 facing away from the speaker 220 defines a second surface 241. The side of the reinforcement 243 facing the loudspeaker 220 is formed by means of in-mold molding with a connector 245, and the connector 245 may enclose a part of the sound cavity for enhancing the vibration effect of the loudspeaker 220. The adhesive layer is located on the side of the connecting member 245 facing the speaker 220, the adhesive layer may be a double-sided adhesive tape or an ultraviolet curing adhesive, and the adhesive layer may firmly connect the flexible circuit board 230 to the connecting member 245.

In one embodiment, the lug 251 includes third and

fourth surfaces

2511 and 2513 disposed opposite to each other, and the first connection hole 257 extends through the third and

fourth surfaces

2511 and 2513. The boss 253 includes a fifth surface 2531 and a sixth surface 2533 which are opposite to each other, the second connection hole 259 penetrates through the fifth surface 2531 and the sixth surface 2533, and the third surface 2511 and the sixth surface 2533 are opposite to each other and can be attached to each other. The third surface 2511 is lower than the side of the first surface 111. In one embodiment, the fifth surface 2531 is lower than the side of the second surface 241, and the end of the threaded fastener 255 distal from the lug 251 is lower than the side of the second surface 241. With the above structure, the lug 251 is concavely disposed in the through hole 110, the boss 253 is also concavely disposed on the outer circumference of the support member 210, the end of the threaded fastener 255 is lower than the second surface 241, and after the boss 253 is matched with the lug 251, the connection structure of the box sound cavity 200 and the front case 100 can be prevented from occupying an excessively large size in the thickness direction of the mobile terminal 10, and the connection strength of the box sound cavity 200 and the front case 100 can be ensured.

Referring to fig. 1, in one embodiment, the threaded fastener 255 penetrates into the second coupling hole 259 of the boss 253 from the side of the second surface 241 and is coupled to the lug 251. Referring to fig. 5, in another embodiment, the threaded fastener 255 may also penetrate into the first connection hole 257 of the lug 251 from the side facing away from the second surface 241 and connect to the boss 253. The above-mentioned setting can realize the fixed connection of box sound chamber 200 and preceding shell 100, and can be under the prerequisite of guaranteeing box sound chamber 200 and preceding shell 100 joint strength attenuate box sound chamber 200 and preceding shell 100's connection structure's thickness to further make full use of mobile terminal 10's inner space.

Referring to fig. 4, in an embodiment, the box sound cavity 200 may further include a buffer member 260, the buffer member 260 is disposed between the connection member 245 and the speaker 220, and the connection member 245 can press the buffer member 260, so that the buffer member 260 presses the speaker 220. In one embodiment, the buffer 260 is a sponge, and the buffer 260 has a porous structure and is easily deformed. The side of the buffer member 260 facing the connecting member 245 is attached to the connecting member 245, and the side of the buffer member 260 facing the speaker 220 is attached to the surface of the speaker 220. In an embodiment, after the buffer 260 is attached to the connecting member 245, and after the connecting member 245 is connected with the supporting member 210 into a whole, the connecting member 245 can press the buffer 260, the buffer 260 deforms, and the deformation of the buffer 260 enables the connecting member 245 to press the speaker 220. In one embodiment, the buffer 260 has a hollow rectangular block shape. The buffer member 260 is attached to the surface of the speaker 220 facing the cover plate assembly 240 and is located at the outer circumference of the speaker 220. The above arrangement of the damper 260 provides more space for the sound cavity on the connecting member 245, which is beneficial to reduce the volume of the box sound cavity 200.

In one embodiment, the connecting member 245 is welded to the supporting member 210 by ultrasonic welding. Ultrasonic welding has the advantages of rapidness, energy conservation, high fusion strength, good conductivity, no spark, close to cold processing and the like. Since the ultrasonic welding does not have the problems of heat conduction, resistivity, and the like, the connecting member 245 and the supporting member 210 can be effectively welded, so that the reliability of the connection between the connecting member 245 and the supporting member 210 can be improved, the ultrasonic welding can obtain higher welding quality, and the connection structure between the cover plate assembly 240 and the supporting member 210 can be simplified, so that the space occupied by the box sound cavity 200 in the thickness direction of the mobile terminal 10 is reduced, and the utilization rate of the internal space of the mobile terminal 10 can be further improved. For example, in one embodiment, the box sound cavity 200 of the above-described structure may be thinned by about 0.2 mm. The saved space may be used to further adjust the shape of the box sound cavity 200 to provide more space for the battery of the mobile terminal 10 to further increase the capacity of the battery.

In one embodiment, the box sound cavity 200 is further provided with a protrusion 270, the protrusion 270 and the support member 210 are integrally formed, and the protrusion 270 is provided with a sound outlet 271. The front housing 100 is formed with a receiving groove 120 and an external sound hole 130, the receiving groove 120 is communicated with the external sound hole 130, and the protrusion 270 is embedded in the receiving groove 120 to communicate the sound outlet 271 with the external sound hole 130. In one embodiment, the sound outlet 271 has a rectangular cross-section, and a plurality of external sound holes 130 are provided, and the plurality of external sound holes 130 are distributed on the front housing 100 at intervals. When the microprocessor of the mobile terminal 10 controls the speaker 220 to emit sound, the sound generated by the speaker 220 is adjusted by the sound cavity vibration and then transmitted from the sound outlet 271, and can be transmitted to the outside of the mobile terminal 10 through the external sound hole 130 of the front case 100. The arrangement of the protrusion 270 and the receiving groove 120 is beneficial to assembling and positioning the box sound cavity 200 and the front housing 100. In an embodiment, the bottom wall of the receiving groove 120 may protrude inward toward the through hole 110, and the bottom wall of the receiving groove 120 may support the protrusion 270, thereby facilitating the reliable connection of the box sound cavity 200 to the front case 100. It will be appreciated that the convex configuration of the bottom wall of the receiving channel 120 is not required.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A box sound cavity fixing structure is used for connecting a box sound cavity of a mobile terminal to a front shell of the mobile terminal, the front shell is provided with a first surface, the side of the first surface is used for installing a display screen of the mobile terminal, the other side, opposite to the first surface, of the front shell is used for covering a battery cover, a through hole used for containing the box sound cavity is formed in the front shell, and extends to the first surface, the box sound cavity fixing structure is characterized by comprising a supporting piece, a loudspeaker, a flexible circuit board and a cover plate assembly, a lug is arranged on the box sound cavity, the lug and the supporting piece are integrally formed, and a sound outlet is formed in the lug; the front shell is provided with a containing groove and an external sound hole, the containing groove is communicated with the external sound hole, and the lug is embedded in the containing groove so that the sound outlet is communicated with the external sound hole; the box sound cavity fixing structure comprises:

a lug for connecting with the front shell; the lug is concavely arranged in the through hole and protrudes outwards from the hole wall of the through hole; the lug is provided with a first connecting hole;

the boss is used for being connected with the periphery of the box sound cavity, and a second connecting hole is formed in the boss; the boss corresponds in position to the lug for overlying the lug, an

2. The box sound cavity securing structure of claim 1, wherein the lug is integrally formed with the front housing.

3. The box sound cavity fixing structure according to claim 1, wherein the number of the lugs is plural, and the plurality of lugs are distributed on the hole wall of the through hole at intervals; the number of bosses is the same as the number of lugs.

4. The box sound cavity fixing structure according to claim 1, further comprising a heat-melting nut made of a metal material, wherein the heat-melting nut is disposed in the first connecting hole, and the threaded fastener is screwed with the heat-melting nut to fixedly connect the lug with the boss.

5. A box sound cavity is used for being accommodated in a through hole on a front shell of a mobile terminal, and is characterized by comprising a support piece, a loudspeaker, a flexible circuit board and a cover plate assembly, wherein the box sound cavity is connected to the front shell of the mobile terminal through a box sound cavity fixing structure according to any one of claims 1 to 4, a boss is connected to the periphery of the support piece, an accommodating cavity is formed in the support piece, and the loudspeaker is accommodated in the accommodating cavity; the flexible circuit board is in communication connection with the loudspeaker, the cover plate assembly is covered on the loudspeaker, and the flexible circuit board is positioned between the cover plate assembly and the supporting piece; a lug is arranged on the box sound cavity, the lug and the support piece are integrally formed, and a sound outlet is formed in the lug; the front shell is provided with a containing groove and an external sound hole, the containing groove is communicated with the external sound hole, and the convex block is embedded in the containing groove so that the sound outlet is communicated with the external sound hole.

6. The box sound cavity of claim 5, wherein the boss is integrally formed with the support.

7. The box sound chamber of claim 5, wherein the cover plate assembly comprises a reinforcement member and a connecting member, the reinforcement member is made of metal, the connecting member is made of plastic, and the connecting member is located on a side of the reinforcement member facing the speaker; the box sound chamber still includes the adhesive linkage, the adhesive linkage is located the connecting piece orientation one side of speaker, the flexible line way board passes through the adhesive linkage with the connecting piece is connected.

8. The box sound cavity of claim 7, further comprising a buffer member disposed between the connector and the speaker, wherein the connector can compress the buffer member so that the buffer member compresses the speaker.

9. The box sound chamber of claim 7, wherein the connecting member is welded to the support member, and the welding is ultrasonic welding.

10. A mobile terminal, characterized in that it comprises a front housing and a box sound cavity according to any of claims 5-9, said box sound cavity being attached to said front housing; the cover plate assembly has a second surface, and the first surface and the second surface are located on the same side of the front housing.

11. The mobile terminal of claim 10, wherein the lug comprises third and fourth oppositely disposed surfaces, and the first connection hole extends through the third and fourth surfaces; the boss comprises a fifth surface and a sixth surface which are arranged in an opposite mode, the second connecting hole penetrates through the fifth surface and the sixth surface, and the third surface and the sixth surface are arranged oppositely and can be attached to each other; the third surface is lower than the side where the first surface is located.

12. The mobile terminal of claim 11, wherein the fifth surface is lower than the second surface, and wherein the end of the threaded fastener distal from the lug is lower than the second surface.