WO2012013098A1

WO2012013098A1 - Audio cavity sealing structure for loudspeaker and portable mobile terminal

Info

Publication number: WO2012013098A1
Application number: PCT/CN2011/075957
Authority: WO
Inventors: 牟会清
Original assignee: 青岛海信移动通信技术股份有限公司
Priority date: 2010-07-29
Filing date: 2011-06-20
Publication date: 2012-02-02
Also published as: CN101895798A; CN101895798B

Abstract

The present invention discloses an audio cavity sealing structure for a loudspeaker and a portable mobile terminal, and pertains to the technical field of electronics. Solved is the technical problem that the poor tone quality of a portable mobile terminal is caused by the large thickness space of the portable mobile terminal occupied by the existing audio cavity sealing structure for a loudspeaker. The audio cavity sealing structure for the loudspeaker has a circuit board, a cover-shaped holder and a sound insulation pad made of elastic materials. A concave front audio cavity is located at the holder. The part away from the sound part of the loudspeaker is face to the location of the circuit board. An element is fixed on the surrounding circuit board of the loudspeaker. The loudspeaker is surrounded by a sound insulation pad and an edge of the holder is pressed on the sound insulation pad. The sound insulation pad is forced against the circuit board and the element. The portable mobile terminal includes a loudspeaker and the audio cavity sealing structure for the loudspeaker provided by the invention. The invention is applied to reduce the space occupied by the audio cavity sealing structure for a loudspeaker.

Description

The present invention claims the priority of the Chinese patent application entitled "Speaker Sound Chamber Sealing Structure and Portable Mobile Terminal", which is filed on July 29, 2010. The content is incorporated herein by reference. Technical field

The present invention relates to the field of electronic technology, and in particular to a speaker sound chamber sealing structure and a portable mobile terminal provided with the speaker sound chamber sealing structure.

Background technique

With the continuous development of electronic technology, portable mobile terminals such as mobile phones and handheld computers have become the most common communication tools in people's daily life.

At present, thin and light portable mobile terminals are increasingly favored by customers. The speaker is an important component on the portable mobile terminal. To ensure the sound quality of the speaker, the existing portable mobile terminal is usually provided with a speaker sound chamber sealing structure.

Taking a mobile phone as an example, the speaker sound cavity sealing structure in the existing mobile phone usually includes a cover-shaped and plastic material bracket, a plastic film sealing box and a circuit board, wherein: the bracket is detachable and fixed. On the circuit board, the bracket is provided with a concave front sound chamber, and the front sound chamber cover is disposed on the sound emitting portion (or speaker) of the speaker; the portion of the speaker away from the sound emitting portion is opposite to the position of the circuit board; The box is fixed to the circuit board by ultrasonic welding, and the sealing box is disposed on the speaker away from the portion of the sound emitting portion, and there is a gap or slight contact between the sealing box and the components on the circuit board around the speaker.

The sounding part of the speaker is used to emit sound, and the sealing box forms a rear sound chamber which is relatively independent from the front sound chamber and has a sealed structure. The rear sound chamber formed by the sealed box can avoid resonance of the sound emitting part of the speaker and the rear of the speaker. Or resonance, which in turn ensures that the speaker has Better sound quality.

In the process of implementing the present invention, the inventors have found that at least the following problems exist in the prior art: Because in the prior art, the rear sound chamber of the sealing structure is a sealed box which is disposed outside the portion of the speaker away from the sound emitting portion and The shape of the sealed box is usually relatively regular, and the shape of the components on the circuit board around the speaker is relatively diverse. The sealed box cannot be matched with the shape of all components to ensure the sealed box. Does not affect the components, there is usually a gap between the sealed box and the component or only a slight contact with the components of the portable mobile terminal in the thickness direction (the direction perpendicular to the board), the sealed box in this structure The existence of the device will affect the positional relationship between the components on the circuit board and the speaker. The components cannot fully utilize the space around the speaker in the thickness direction of the portable mobile terminal, so the existence of the sealed box wastes a lot of space in the thickness direction of the portable mobile terminal. , resulting in a very small space for accommodating speakers in the portable mobile terminal, And only use a smaller thickness dimension speakers because smaller speakers typically the thickness dimension of the speaker sound is not ideal, resulting in poor quality portable mobile terminal.

Summary of the invention

The embodiment of the invention provides a speaker sound chamber sealing structure and a portable mobile terminal provided with the speaker sound chamber sealing structure, which solves the problem that the existing speaker sound chamber sealing structure occupies a large thickness space of the portable mobile terminal, resulting in portable movement. The technical problem of poor sound quality of the terminal.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

The speaker cavity sealing structure comprises a cover-shaped bracket, a soundproofing pad made of an elastic material, and a circuit board, wherein:

The bracket is provided with an inner sound chamber, and the front sound chamber cover is disposed on the sounding portion of the speaker;

a portion of the speaker remote from the sound emitting portion is opposite to a position of the circuit board; a component is fixed on the circuit board around the speaker; The soundproofing pad has a closed curve shape and surrounds the speaker, the edge of the bracket is pressed against the soundproofing pad, and the soundproofing pad is pressed against the circuit board and the component.

The portable mobile terminal includes a speaker and the speaker sound cavity sealing structure provided by the present invention described above.

Compared with the prior art, any technical solution provided by the present invention provides the following advantages:

Since the soundproofing pad of the speaker sound chamber sealing structure provided by the invention has a closed curve shape and surrounds the speaker, the edge of the bracket is pressed against the soundproofing pad, and the soundproofing pad is pressed against the circuit board and the component, the bracket and the soundproofing pad The circuit board and the components form a complete sealed cavity that can be used for sound insulation. The sealed cavity can avoid resonance or resonance after the sounding part of the speaker emits sound, thereby ensuring that the speaker has a better sound. Good sound quality, it can be seen that the invention fully utilizes the sound insulation performance of the bracket, the circuit board and the components, and the sealed cavity formed by the bracket, the soundproofing pad, the circuit board and the components functions in the existing speaker sound cavity sealing structure. The role played by the sealed box;

At the same time, since the sealing box made of the plastic sheet is not provided in the invention, the space occupied by the sealing box in the thickness direction of the portable mobile terminal is saved, and the soundproofing pad is located at the edge of the bracket, and the components on the circuit board are not affected. The positional relationship with the speaker, the component can make full use of the space around the speaker in the thickness direction of the portable mobile terminal provided with the speaker cavity sealing structure, thereby making the soundproof pad waste space in the thickness direction of the portable mobile terminal It is much smaller than the space wasted by the sealed box made of plastic sheet in the thickness direction of the portable mobile terminal, so that the space for accommodating the speaker in the portable mobile terminal is more abundant, and the thickness is larger, and the sound effect is more ideal. The speaker solves the technical problem that the existing speaker sound cavity sealing structure occupies a large thickness space of the portable mobile terminal, resulting in poor sound quality of the portable mobile terminal;

In addition, the sound insulating mat used in the present invention is made of an elastic material, and since the low-cost elastic material is quite large, the present invention can make the cost of the sound insulating mat much lower than that of the plastic sheet. The sealed box is further advantageous for reducing the cost, and in the present invention, the sound insulating pad can be positioned by pressing, and the mounting operation of the present invention is more compact than the prior art method of fixing the sealed box by the ultrasonic welding process. Single, convenient, and less time consuming, so production efficiency is higher. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description For some embodiments of the present invention, other drawings may be obtained from those skilled in the art without departing from the drawings.

1 is a perspective view of a main board of a portable mobile terminal provided with a speaker sound chamber sealing structure provided by an embodiment of the present invention;

2 is a perspective view showing a positional relationship between a bracket and an electromagnetic shielding cover when a soundproofing pad is not installed in a speaker sound chamber sealing structure according to an embodiment of the present invention;

Figure 3 is a perspective view 1 of the soundproofing pad placed on the bracket shown in Figure 2;

Figure 4 is a perspective view 2 of the soundproofing pad placed on the bracket shown in Figure 2;

Figure 5 is an enlarged schematic view of a portion A in Figure 4;

6 is a perspective view of an electromagnetic shielding cover in a speaker sound chamber sealing structure according to an embodiment of the present invention;

7 is a perspective view of a bracket in a speaker sound chamber sealing structure according to an embodiment of the present invention;

FIG. 8 is a perspective view showing a positional relationship between a bracket and an electromagnetic shield when a soundproofing mat is installed in a speaker sound chamber sealing structure according to an embodiment of the present invention; FIG.

Figure 9 is a perspective view of the upper soundproofing pad shown in Figure 4 or Figure 8;

FIG. 10 is a perspective view of a sound insulating mat in a speaker sound chamber sealing structure according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the invention provides a speaker sound chamber sealing structure that occupies less space of the portable mobile terminal, is convenient to install, has low cost, and can make the sound quality of the portable mobile terminal more ideal, and is portable with the speaker sound chamber sealing structure. Mobile terminal.

As shown in FIG. 1 , FIG. 2 and FIG. 7 , the speaker sound chamber sealing structure provided by the embodiment of the present invention includes a cover-shaped bracket 1 as shown in FIG. 2 , and an acoustic material as shown in FIG. 7 . Pad 2 and circuit board 3, where:

The bracket 1 is provided with a front sound chamber 4 having a concave shape as shown in FIG. 3, and the front sound chamber 4 is disposed on the sound emitting portion 50 of the speaker 5 as shown in FIG. 1; the portion of the speaker 5 remote from the sound emitting portion 50 is The circuit board 3 is oppositely positioned; the component 6 is fixed on the circuit board 3 around the speaker 5; the soundproofing pad 2 has a closed curve shape, and surrounds the speaker 5, the edge of the bracket 1 is pressed against the soundproofing pad 2, and the soundproofing pad is 2 is pressed against the circuit board 3 and the component 6.

Since the soundproofing pad 2 of the speaker sound chamber sealing structure provided by the present invention has a closed curve shape and surrounds the speaker 5, the edge of the bracket 1 is pressed against the soundproofing pad 2, and the soundproofing pad 2 is pressed against the circuit board 3 and the element. On the device 6, the bracket 1, the soundproofing pad 2, the circuit board 3, and the component 6 form a complete sealed cavity capable of soundproofing, and the sealed cavity can prevent the sounding portion 50 of the speaker 5 from emitting sound after the speaker Resonance or resonance occurs at the rear of 5, which in turn ensures that the speaker 5 has better sound quality. Thus, the present invention fully utilizes the sound insulation performance of the bracket 1, the circuit board 3, and the component 6, the bracket 1, the soundproof pad 2, The sealed cavity formed by the circuit board 3 and the component 6 functions as a sealed box in the existing speaker sound cavity sealing structure; At the same time, since the sealing box made of the plastic sheet is not provided in the invention, the space occupied by the sealing box in the thickness direction of the portable mobile terminal is saved, and the soundproofing pad 2 is located at the edge of the bracket 1 without affecting the circuit board 3 The positional relationship between the upper component 6 and the speaker 5, the component 6 can make full use of the space around the speaker 5 in the thickness direction of the portable mobile terminal provided with the speaker cavity sealing structure, thereby enabling the soundproofing pad 2 to be portablely moved. The space wasted in the thickness direction of the terminal is much smaller than the space wasted by the sealed box made of plastic sheet in the thickness direction of the portable mobile terminal, so that the space for accommodating the speaker 5 in the portable mobile terminal is more abundant, and the thickness dimension can be selected. The speaker 5 with larger sound effect is more ideal, so the existing speaker cavity sealing structure occupies more space of the portable mobile terminal, which leads to a technical problem of poor sound quality of the portable mobile terminal;

In addition, the sound insulating mat 2 used in the present invention is made of an elastic material. Since the low-cost elastic material is quite large, the present invention can make the cost of the sound insulating mat 2 much lower than that of the plastic sheet. Moreover, the cost is further reduced, and the sound insulating pad 2 can be positioned in a pressing manner in the present invention. Compared with the prior art method of fixing the sealed box by the ultrasonic welding process, the installation operation of the present invention is more simple and convenient. , it takes less time, so the production efficiency is higher.

As shown in FIG. 6 and FIG. 8 , in the embodiment, the component 6 is an electromagnetic shielding cover disposed outside the electronic device on the circuit board 3 shown in FIG. 1 , and the edge of the bracket 1 is pressed against the sound insulating pad 2 . The soundproofing mat 2 is pressed against the circuit board 3 and the portion of the electromagnetic shield that is close to the speaker 5. The electronic device on the circuit board 3, especially the electronic device on the circuit board 3 in the portable mobile terminal, has a relatively high probability of electromagnetic interference. Therefore, the electromagnetic shielding cover can effectively avoid electromagnetic interference between the electronic devices. Since the electromagnetic shielding cover is mostly made of a metal material, and the metal material itself has good sound insulation performance, the edge of the bracket 1 in this embodiment is pressed against the sound insulating mat 2, and the soundproofing mat 2 is pressed against the circuit board 3 and the electromagnetic When the shield is close to the portion of the speaker 5, the bracket 1, the sound insulating mat 2, the circuit board 3, and the electromagnetic shield can be formed into a complete sealed cavity which can provide better sound insulation. Of course, the component 6 in this embodiment may also be an electromagnetic shielding cover such as a protective cover. Other components outside.

The rim of the bracket 1 is fixed to the sound insulating wall 7 as shown in FIGS. 5 and 7 in the direction of approaching the circuit board 3, the sound insulating mat 2 is bonded to the top of the sound insulating wall 7, and the sound insulating mat 2 is interposed between the sound insulating wall 7. Between the circuit board 3 or between the sound insulating wall 7 and the electromagnetic shielding cover.

The sound insulating wall 7 not only functions as a soundproofing but also increases the pressure at which the edge of the bracket 1 abuts against the pressure of the diaphragm 2 at 4 degrees. When the sound insulating mat 2 is bonded to the top of the sound insulating wall 7, on the one hand, the tight connection between the sound insulating mat 2 and the sound insulating wall 7 can be further ensured, thereby ensuring the formation of the bracket 1, the sound insulating mat 2, the circuit board 3 and the electromagnetic shielding cover. The sealing effect of the sound-insulating sealing cavity; on the other hand, when the sound insulating mat 2 is bonded to the sound insulating wall 7 and then the bracket 1 is placed on the circuit board 3 and the electromagnetic shielding cover, the mounting operation is more convenient. In this embodiment, the soundproofing pad 2 is preferably bonded to the top of the sound insulating wall 7 by using double-sided tape. Of course, in this embodiment, the sound insulating pad 2 can be fixed to the sound insulating wall 7 by using other bonding means such as other glues or binding structures. the top of.

As a further improvement of the embodiment of the present invention, the electromagnetic shielding cover in the embodiment includes a top cover 60 as shown in FIG. 6 and a periphery of the top cover 60 and fixed on the circuit board 3 as shown in FIG. Side 61;

In the direction perpendicular to the circuit board 3, the height of the sound insulating wall 7 opposite to the position of the top cover 60 of the electromagnetic shield is smaller than the height of the sound insulating wall 7 of the other portions;

The soundproofing mat 2 further includes at least one first bent portion 21, and the two ends of the first bent portion 21 are respectively disposed between the circuit board 3 and the sound insulating wall 7 as shown in FIG. The top cover 60 of the electromagnetic shielding cover and the soundproofing pad 2 between the sound insulating walls 7 are connected; in the state shown in FIG. 3, the first bent portion 21 is in an unfolded state; in the state shown in FIG. The bent portion 21 is bent downward toward the bracket 1;

The electromagnetic shield is also fixed with a first abutting portion 63 extending as shown in FIG. 6 and FIG. 8 toward the circuit board 3 as shown in FIG. 1. The first abutting portion 63 is pressed against the first bend. On the folded portion 21, the first bent portion 21 is pressed against the sound insulating wall 7.

The matching structure formed by the first bent portion 21 and the first abutting portion 63 can be an electromagnetic shielding cover The side portion 61 is sealed with the gap between the sound insulating walls 7, thereby further improving the sealing of the soundproofing sealing cavity formed by the bracket 1, the sound insulating mat 2, the circuit board 3, and the electromagnetic shield.

As shown in FIG. 6 and FIG. 8 , the top cover 60 of the electromagnetic shielding cover is further provided with a venting hole 10 opposite to the position of the speaker 5 shown in FIG. 1 , and the venting hole 10 has the bracket 1 , the sound insulating pad 2 , the circuit board 3 , and The sealed cavity formed by the electromagnetic shielding cover communicates with the electromagnetic shielding cavity formed by the electromagnetic shielding cover and the circuit board 3, thereby improving the sealing cavity formed by the bracket 1, the sound insulating pad 2, the circuit board 3 and the electromagnetic shielding cover Breathability and heat dissipation. Since the electromagnetic shielding cavity formed by the electromagnetic shielding cover and the circuit board 3 also has a certain sealing property, the vent hole 10 formed by the top cover 60 is not formed on the bracket 1, the sound insulating pad 2, the circuit board 3, and the electromagnetic shielding cover. The sound insulation effect of the sealed cavity has a great influence.

As shown in FIG. 4, FIG. 5 and FIG. 8, as a further improvement of the embodiment of the present invention, the sound insulating mat 2 in the embodiment further includes at least one second bent portion 22, and the second bent portion 22 and the position are interposed between the circuits. The soundproofing pad 2 between the plate 3 and the sound insulating wall 7 is connected to the edge of the portion of the electromagnetic shielding cover, and is bent in a direction away from the circuit board 3; in the state shown in FIG. 3, the second bending portion 22 is Expanded state; in the state shown in Figure 4, the second bent portion 22 is bent downward toward the bracket 1;

The side portion 61 of the electromagnetic shielding cover is fixed with a convex edge 62 which is convex, and the edge of the protruding edge 62 is fixed with at least one second abutting portion 64 extending in the direction of approaching the circuit board 3, and the second abutting portion The portion 64 is pressed against the second bent portion 22 and presses the second bent portion 22 against the sound insulating wall 7.

The same as the matching structure formed by the first bending portion 21 and the first abutting portion 63, the matching structure formed by the second bending portion 22 and the second abutting portion 64 makes the electromagnetic shielding cover and the sound insulating wall 7 cooperate. More compact, thereby further improving the sealing of the sound-insulating sealing cavity formed by the bracket 1, the sound insulating mat 2, the circuit board 3, and the electromagnetic shield.

As a further improvement of the embodiment, in this embodiment, the electromagnetic shielding cover is integrally formed with the protruding edge 62, the first abutting portion 63, and the second abutting portion 64 as shown in FIG. 6, and/or the position is between As shown in Figure 1, the circuit board 3, as shown in Figure 7, between the soundproofing walls 7 between the soundproofing mat 2 and Figure 3 and The first bent portion 21 and the second bent portion 22 shown in Fig. 5 are an integral mechanism. The integrated structure is not only reliable in connection but also easy to manufacture in one time. In this embodiment, the electromagnetic shielding cover and the flange 62 and the second abutting portion 64 can be cut and bent by a metal plate. The soundproofing mat 2 disposed between the circuit board 3 and the sound insulating wall 7 is integrated with the first bent portion 21 and the second bent portion 22, so that the soundproofing between the circuit board 3 and the sound insulating wall 7 is made. The mat 2 and the sound insulating mat 2 interposed between the top cover 60 of the electromagnetic shielding cover and the sound insulating wall 7 can be respectively bonded, thereby making the bonding operation of the sound insulating mat 2 more convenient.

As shown in FIG. 4 and FIG. 5, the rim of the bracket 1 is further provided with at least one buckle 8 in the shape of a bend, and the end of the buckle 8 extends in a direction close to the central area of the bracket 1, and the end of the buckle 8 Abuts the side of the circuit board 3 on the edge away from the speaker 5. In this embodiment, the bracket 1 is detachably connected to the circuit board 3 through the mating structure between the buckle 8 and the edge of the circuit board 3. The mating structure between the buckle 8 and the edge of the circuit board 3 is not only simple and convenient to install. Moreover, the bracket 1 and the circuit board 3 can be detachably fixed together. In the embodiment, six brackets 8 are fixed on the bracket 1, and the six buckles 8 detachably fix the bracket 1 and the circuit board 3 from a plurality of angles.

As shown in FIG. 4 and FIG. 8 , a positioning post 9 is also fixed on the bracket 1 , and a positioning hole is formed on the circuit board 3 as shown in FIG. 1 , and the positioning post 9 is embedded in the positioning hole. The matching structure of the positioning post 9 and the positioning hole makes the mounting operation of the bracket 1 and the circuit board 3 more convenient. It is only necessary to align the positioning post 9 on the bracket 1 with the positioning hole, and then apply a thrust toward the circuit board 3, The bracket 1 can be quickly and accurately inserted into the circuit board 3.

As shown in Fig. 9, it is a perspective view of the upper soundproofing pad shown in Fig. 4 or Fig. 8. In various embodiments of the present invention, the upper soundproofing pad refers to a soundproofing pad bonded to the bracket 1 and located at the upper portion of FIG. 4 or FIG. 8 in the state shown in FIG. 4 or FIG. 8, as may be The soundproofing pad is placed between the circuit board 3 and the sound insulating wall 7.

As shown in FIG. 10, it is a perspective view of a soundproofing pad in a speaker sound cavity sealing structure provided by an embodiment of the present invention. In this embodiment, the sound insulating mat 2 is made of foam or silicone material. Both foam and silica gel have good elasticity and have good sound insulation properties, and are suitable for making soundproof mats 2. The sound insulating mat 2 in this embodiment is preferably made of a foam material. The foam has the advantages of bending, flexibility, light weight and reliable performance, and is more suitable for the production of the soundproof mat 2.

The portable mobile terminal provided by the embodiment of the present invention comprises a speaker 5 as shown in FIG. 1 and a speaker sound chamber sealing structure provided by the above embodiment of the present invention.

Since the portable mobile terminal provided by the embodiment of the present invention has the same technical features as the speaker sound chamber sealing structure provided by the embodiment of the present invention described above, the same technical effect can be produced and the same technical problem can be solved.

The circuit board in the speaker sound chamber sealing structure provided in the above embodiment is preferably a main board of a portable mobile terminal. The space on the main board of the portable mobile terminal is sufficient and generally opposite to the position of the speaker. The speaker cavity sealing structure provided by the embodiment of the present invention is suitable for sealing the sound cavity of the speaker.

Of course, the speaker sound chamber sealing structure provided by the embodiment of the present invention can also be applied to other electronic devices than the portable mobile terminal.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Claim

A speaker sound chamber sealing structure, comprising: a cover-like bracket, a soundproofing pad made of an elastic material, and a circuit board, wherein:

a portion of the speaker remote from the sound emitting portion is opposite to a position of the circuit board; a component is fixed on the circuit board around the speaker;

The soundproofing pad has a closed curve shape and surrounds the speaker, the edge of the bracket is pressed against the soundproofing pad, and the soundproofing pad is pressed against the circuit board and the component.

2. The speaker sound chamber sealing structure according to claim 1, wherein: the component is an electromagnetic shielding cover disposed outside the electronic device on the circuit board, and the edge of the bracket is pressed against the The sound insulating mat is pressed against the circuit board and the electromagnetic shield is adjacent to a portion of the speaker.

3. The speaker sound chamber sealing structure according to claim 2, wherein: the rim of the bracket is fixed with a sound insulating wall extending in a direction approaching the circuit board, and the sound insulating mat is bonded to the a top of the sound insulating wall, and the sound insulating mat is interposed between the sound insulating wall and the circuit board or between the sound insulating wall and the electromagnetic shielding cover.

The speaker sound chamber sealing structure according to claim 3, wherein: the electromagnetic shielding cover comprises a top portion having a cover shape and a side portion connected to the periphery of the top portion and fixed to the circuit board;

In a direction perpendicular to the circuit board, a height dimension of the sound insulating wall opposite to a top position of the electromagnetic shield is smaller than a height dimension of the sound insulating wall of other portions;

The soundproofing mat further includes at least one first bent portion, and the two ends of the first bent portion are respectively spaced apart from the soundproofing pad and the position between the circuit board and the sound insulating wall The top of the electromagnetic shielding cover and the soundproofing pad between the sound insulating walls are connected; a first abutting portion extending toward the circuit board is further fixed on the electromagnetic shielding cover, the first abutting portion is pressed against the first bending portion, and the The first bent portion is pressed against the sound insulating wall.

The speaker sound chamber sealing structure according to claim 4, wherein: the sound insulating mat further comprises at least one second bent portion, the second bent portion and the position being between the circuit board and the The sound insulating mat between the sound insulating walls is connected to an edge of a portion of the electromagnetic shielding cover, and is bent in a direction away from the circuit board;

The side of the electromagnetic shielding cover is fixed with a convex edge, and the edge of the protruding edge is fixed with at least one second abutting portion extending in a direction of approaching the circuit board, and the second abutting The abutment is pressed against the second bent portion, and the second bent portion is pressed against the sound insulating wall.

The speaker sound chamber sealing structure according to claim 5, wherein: the electromagnetic shielding cover and the protruding edge, the first abutting portion and the second abutting portion are integrated structures, And/or, the soundproofing pad located between the circuit board and the soundproof wall and the first bending part and the second bending part are an integral mechanism.

The speaker sound chamber sealing structure according to claim 1, wherein: the rim of the bracket is further provided with at least one buckle having a bent shape, and the end of the buckle is directed toward the bracket. The direction of the central region extends and the end of the buckle abuts the side of the edge of the circuit board remote from the speaker.

The speaker sound chamber sealing structure according to claim 1, wherein: the bracket is further provided with a columnar positioning post, and the circuit board is provided with a positioning hole, and the positioning post is embedded in the Locating inside the hole.

9. The speaker acoustic cavity sealing structure according to claim 1, wherein: said sound insulating pad is made of a foam or a silicone material.

A portable mobile terminal, comprising: a speaker and the speaker sound chamber sealing structure according to any one of claims 1 to 9.