阅读说明：本技术 移动终端 (Mobile terminal ) 是由 冯炉 刘阳 于 2020-04-27 设计创作，主要内容包括：本申请属于音频设备技术领域,尤其涉及一种移动终端,包括壳体和设置于壳体内的扬声器,扬声器包括盒体和发声单元,盒体包括第一盖体、位于第一盖体上的第二盖体和盖板,发声单元设置于第一盖体内,并和第一盖体之间形成第一腔室,第一腔室开设有出音口,发声单元和第二盖体之间形成第二腔室,发声单元具有振膜,振膜的相对两面分别对应第一腔室和第二腔室,第一盖体内形成有谐振腔,谐振腔和第一腔室相连通,谐振腔朝向第二腔室的一侧开设有通口,盖板盖设于通口上,盖板上开设有微孔,气流通过微孔出入第二腔室,使得第二腔室的内部气压不会发生明显变化,也使得振膜振动时不会磕碰到发声单元内的磁性件,提升了扬声器的高频音出音质感。(The application belongs to the technical field of audio equipment, and particularly relates to a mobile terminal, which comprises a shell and a loudspeaker arranged in the shell, wherein the loudspeaker comprises a box body and a sound production unit, the box body comprises a first cover body, a second cover body and a cover plate, the second cover body is positioned on the first cover body, the sound production unit is arranged in the first cover body, a first cavity is formed between the sound production unit and the first cover body, the first cavity is provided with a sound outlet, a second cavity is formed between the sound production unit and the second cover body, the sound production unit is provided with a vibrating diaphragm, two opposite surfaces of the vibrating diaphragm respectively correspond to the first cavity and the second cavity, a resonant cavity is formed in the first cover body, the resonant cavity is communicated with the first cavity, one side of the resonant cavity facing the second cavity is provided with an opening, the cover plate is covered on the opening, the cover plate is provided with a micropore, airflow enters and exits the second cavity through the micropore, so that the internal air pressure of the second cavity can not obviously change, and the vibrating diaphragm can not collide with the magnetic part in the sounding unit during vibration, so that the high-frequency sound output texture of the loudspeaker is improved.)

1. A mobile terminal, characterized by: the loudspeaker comprises a shell and a loudspeaker arranged in the shell, wherein the loudspeaker comprises a box body and a sound production unit for producing sound;

the box body comprises a first cover body, a second cover body positioned on the first cover body and a cover plate;

the sounding unit is arranged in the first cover body, a first cavity is formed between the sounding unit and the inner bottom wall of the first cover body, and the first cavity is provided with a sound outlet communicated with the external environment of the shell;

a second cavity is formed between the sound generating unit and the inner top wall of the second cover body;

the sound production unit is provided with a vibrating diaphragm for vibrating and producing sound, and two opposite surfaces of the vibrating diaphragm respectively correspond to the first cavity and the second cavity;

a resonant cavity is formed in the first cover body and communicated with the first cavity, an opening is formed in one side, facing the second cavity, of the resonant cavity, the cover plate is arranged on the opening, and micropores communicated with the second cavity are formed in the cover plate.

2. The mobile terminal of claim 1, wherein: be provided with in the first lid and enclose the frame, sound producing unit inlays to be located enclose in the frame, the inside wall of first lid with the interval is formed with first region between the lateral wall of enclosing the frame, be provided with the block article in the first region, the resonant cavity set up in the block article.

3. The mobile terminal of claim 2, wherein: the box body also comprises a porous object, and the porous object is arranged on the cover plate and covers the micropores.

4. A mobile terminal according to claim 3, characterized in that: the porous object is attached to one side of the cover plate, which faces or is back to the resonant cavity.

5. A mobile terminal according to claim 3, characterized in that: the cover plate is provided with a concave cavity on one side facing or back to the resonant cavity, the porous object is embedded in the concave cavity, and the micropores are arranged at the bottom of the concave cavity.

6. The mobile terminal of claim 5, wherein: a gap is formed between the outer edge of the porous article and the wall of the cavity.

7. A mobile terminal according to claim 3, characterized in that: the porous object is a mesh fabric which is made of non-woven fabrics;

or the mesh cloth is formed by laminating non-woven fabrics and absorbent gauze.

8. The mobile terminal according to claim 1 or 2, characterized in that: the box body further comprises a PET film, the PET film covers one side, facing the resonant cavity, of the cover plate, and a first ventilation area communicated with the resonant cavity is formed between the PET film and the cover plate.

9. The mobile terminal according to claim 1 or 2, characterized in that: the box body further comprises a PET film, the PET film covers one side, back to the resonant cavity, of the cover plate, and a second ventilation area communicated with the second cavity is formed between the PET film and the cover plate.

10. The mobile terminal according to claim 1 or 2, characterized in that: the box body further comprises a PET film, the PET film covers one side, facing to or back to the resonant cavity, of the cover plate, and a plurality of air holes are formed in the PET film.

11. The mobile terminal according to any of claims 2 to 7, wherein: the inner wall of the surrounding frame is provided with a connecting channel, the connecting channel penetrates through the surrounding frame and the block object and is communicated with the resonant cavity, and the sectional area of the connecting channel is larger than the opening area of the micropores.

12. The mobile terminal of claim 11, wherein: the cross-sectional area of the connecting channel is 2-15 times of the opening area of the micropore.

13. The mobile terminal according to any of claims 1 to 7, wherein: the aperture of the micropore is 0.5 mm-2 mm.

Technical Field

The application belongs to the technical field of audio equipment, and particularly relates to a mobile terminal.

Background

The terminal equipment such as a mobile phone, a tablet computer or a notebook computer is internally provided with a loudspeaker, the loudspeaker comprises a box body and a sound production unit arranged in the box body, and when the loudspeaker is applied to the terminal equipment, the box body of the loudspeaker is communicated with the external environment through a sound outlet.

Among the prior art, because speaker and terminal equipment inner space are linked together, the casing when terminal equipment receives to press, when its inner space volume changes, the place ahead space of the vibrating diaphragm in the speaker box body and the atmospheric pressure in rear space also can correspondingly change, so can disturb the air vibration frequency in the sound producing unit, lead to the vibrating diaphragm displacement from top to bottom, the noise appears, and on probably touching the magnetic part in the sound producing unit, and receive the damage, tooth sound and metal sound are comparatively obvious when also leading to the speaker to produce the sound simultaneously.

Disclosure of Invention

An object of the embodiment of the application is to provide a mobile terminal, aim at solving the casing of mobile terminal among the prior art and receive pressing, when the inner space volume changes, tooth sound and the comparatively obvious technical problem of metalling when speaker in it goes out the sound.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: the mobile terminal comprises a shell and a loudspeaker arranged in the shell, wherein the loudspeaker comprises a box body and a sound production unit for producing sound; the box body comprises a first cover body, a second cover body positioned on the first cover body and a cover plate; the sounding unit is arranged in the first cover body, a first cavity is formed between the sounding unit and the inner bottom wall of the first cover body, and the first cavity is provided with a sound outlet communicated with the external environment of the shell; a second cavity is formed between the sound generating unit and the inner top wall of the second cover body; the sound production unit is provided with a vibrating diaphragm for vibrating and producing sound, and two opposite surfaces of the vibrating diaphragm respectively correspond to the first cavity and the second cavity; a resonant cavity is formed in the first cover body and communicated with the first cavity, an opening is formed in one side, facing the second cavity, of the resonant cavity, the cover plate is arranged on the opening, and micropores communicated with the second cavity are formed in the cover plate.

The embodiment of the application provides a mobile terminal, the speaker sets up in its casing, form first cavity between the first lid of the sound production unit of speaker and box body, be formed with the second cavity between the second lid of sound production unit and box body, the sound that the sound production unit sent sends to external environment through the sound outlet, first cavity is linked together through resonant cavity and second cavity, the logical mouth department of resonant cavity is provided with the apron of having seted up the micropore, the resonant cavity is linked together through micropore and second cavity, the first cavity and the second cavity of box body can maintain atmospheric pressure balance through the resonant cavity like this, and then make the vibrating diaphragm normal oscillation of sound production unit. Because the second chamber is communicated with the resonant cavity through the micropores, the flow of the air flow passing through the micropores is small, so that the circulation of the air flow in the second chamber is reduced, when the box body is pressed, or in the process of returning from the pressing state to the normal state, the airflow enters and exits the second chamber through the micropores, so that the internal air pressure of the second chamber is not obviously changed, because the first chamber is communicated with the external environment through the sound outlet, the internal air pressure of the first chamber can not be obviously changed, and when the vibrating diaphragm of the sound generating unit vibrates, the amplitude of the vibration can be kept within a reasonable range, so that the vibration film can not collide with the magnetic part in the sound generating unit when vibrating, therefore, the tooth sound and the metal sound of the loudspeaker when the loudspeaker emits sound, particularly high-frequency sound, are effectively inhibited, and the sound emitting texture of the high-frequency sound of the loudspeaker is improved.

Optionally, be provided with in the first lid and enclose the frame, sound production unit inlays to be located enclose in the frame, the inside wall of first lid with the interval is formed with first region between the lateral wall of enclosing the frame, be provided with the block article in the first region, the resonant cavity is seted up in the block article. Through making the interval be formed with first region between the inner wall of first lid and the outer wall of enclosing the frame, the resonant cavity is seted up in the block article in first region, has just so make full use of the assembly space in the box body, has realized the independent setting of resonant cavity for first cavity and second cavity.

Optionally, the box body further comprises a porous article, and the porous article is arranged on the cover plate and covers the micropores. The cover plate is covered with the porous object, and the porous object covers the micropores, so that the porous object and the micropores are combined, further limitation on the air flow in and out of the second chamber is realized, and the internal air pressure of the second chamber is further stabilized.

Optionally, the porous object is attached to a side of the cover plate facing or facing away from the resonant cavity.

Optionally, a concave cavity is formed in one side, facing or facing away from the resonant cavity, of the cover plate, the porous object is embedded in the concave cavity, and the micropores are formed in the bottom of the concave cavity. The concave cavity is formed in the cover plate, and the porous object is embedded in the concave cavity, so that the connection stability of the porous object and the cover plate is improved on one hand, and the porous object can be rapidly detached and replaced relative to the cover plate on the other hand.

Optionally, a gap is formed between an outer edge of the porous article and a wall of the cavity.

Optionally, the porous article is a mesh fabric, and the mesh fabric is made of a non-woven fabric;

or the mesh cloth is formed by laminating non-woven fabrics and absorbent gauze. Through setting up porous article specifically for the screen cloth, benefit from the permeability of screen cloth preferred then, it is comparatively even fine and close that pore distribution is gone up, then its and micropore cooperation on the one hand can realize the accurate regulation to the air current flow of cominging in and going out the second chamber.

Optionally, the box body further comprises a PET film, the PET film covers one side of the cover plate facing the resonant cavity, and a first ventilation area communicated with the resonant cavity is formed between the PET film and the cover plate.

Optionally, the box body further comprises a PET film, the PET film covers one side of the cover plate, which faces away from the resonant cavity, and a second vent area communicated with the second cavity is formed between the PET film and the cover plate.

Optionally, the box body further comprises a PET film, the PET film covers one side of the cover plate, which faces or backs to the resonant cavity, and a plurality of air holes are formed in the PET film.

Optionally, a connection channel is formed in a wall of the first chamber, the connection channel penetrates through the enclosure frame and the block object and is communicated with the resonant cavity, and a cross-sectional area of the connection channel is larger than an opening area of the micro-hole. By making the cross-sectional area of the connecting channel larger than the open area of the micropores, the speed of the airflow entering the resonant cavity from the first chamber is larger than the speed of the airflow entering the second chamber from the resonant cavity, thereby reducing the speed of the airflow exchange between the first chamber and the second chamber.

Optionally, the cross-sectional area of the connecting channel is 2 to 15 times the open area of the micropores. This allows for precise control of the rate at which the gas flow is exchanged between the first and second chambers.

Optionally, the pore diameter of the micropores is 0.5mm to 2 mm. This effectively controls the flow of air into and out of the second chamber.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a prior art drawing;

fig. 2 is a schematic structural diagram of a mobile terminal and a speaker provided in an embodiment of the present application;

fig. 3 is a first schematic sectional structural diagram of a loudspeaker provided in an embodiment of the present application;

fig. 4 is a schematic sectional structure diagram of a loudspeaker provided in the embodiment of the present application;

fig. 5 is a schematic sectional structure diagram three of a loudspeaker provided in the embodiment of the present application;

fig. 6 is a cross-sectional structural diagram of a loudspeaker provided in the embodiment of the present application;

fig. 7 is an exploded schematic view of a speaker according to an embodiment of the present disclosure;

fig. 8 is a schematic partial structural diagram of a loudspeaker according to an embodiment of the present disclosure;

fig. 9 is a schematic view of a partial structure of a speaker according to an embodiment of the present application;

FIG. 10 is a cross-sectional view of a mesh for a speaker according to an embodiment of the present disclosure;

fig. 11 is a schematic view of a part of a structure of a speaker provided in the embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

10-loudspeaker 11-box 12-sound unit

13-cover plate 14-porous object 15-PET film

16-first region 17-block piece 18-connecting channel

20-mobile terminal 21-housing 22-gap

30-generating means 31-air release hole 111-first chamber

112-second chamber 113-sound outlet 114-resonant cavity

115-micropore 116-through opening 117-first cover

118-second cover 119-surrounding frame 121-basin frame

122-voice coil 123-diaphragm 124-washer

125-magnetic member 126-iron core 127-flexible circuit board

131-concave cavity 141-mesh 142-non-woven fabric

143-absorbent gauze layer 151-first ventilation zone 152-second ventilation zone

153-air holes.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to fig. 1-11 are exemplary and intended to be used to illustrate the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

For convenience of understanding, technical terms related to the present application are explained and described below.

A loudspeaker: the transducer is a transducer for converting an electric signal into an acoustic signal, and electrically drives a voice coil in the transducer to vibrate and drives a vibrating diaphragm to vibrate so as to enable air around the vibrating diaphragm to generate resonance and further emit sound.

PET (Polyethylene-terephthalate): it is a thermoplastic polyester containing polyethylene terephthalate, which is a polycondensate of terephthalic acid and ethylene glycol, commonly known in the industry as a polyester resin.

Non-woven fabrics: made of directional or random fibers, has the advantages of moisture resistance, air permeability, flexibility, light weight, no combustion supporting, easy decomposition and the like.

Absorbent gauze: refers to the pure cotton gauze after degreasing treatment.

Fig. 1 is a schematic structural diagram of a sound generating device 30 in the prior art, which shows that a casing of the sound generating device 30 is provided with a gas release hole 31. When the sound-emitting device 30 is mounted in the external terminal device, the air release hole 31 of the sound-emitting device communicates with the internal space of the terminal device.

As shown in fig. 2, the present embodiment provides a mobile terminal 20, which includes a housing 21 and a speaker 10 disposed in the housing 21. The mobile terminal 20 includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), and the like, especially, the mobile terminal 20 has high waterproof sealing performance, and the embodiment of the present application does not limit the specific type of the mobile terminal 20.

Referring to fig. 2 and 3, the speaker 10 includes a box 11 and a sound generating unit 12 for generating sound, the box 11 includes a first cover 117, a second cover 118 located on the first cover 117, and a cover 13, the sound generating unit 12 is disposed in the first cover 117, and a first cavity 111 is formed between the sound generating unit and an inner bottom wall of the first cover 117, the first cavity 111 is provided with a sound outlet 113 communicated with an external environment of the housing 21, a position of the housing 21 of the mobile terminal 20, corresponding to the sound outlet 113 of the speaker 10, is provided with a notch 22, so that the sound generated by the speaker 10 is transmitted to the external environment, and a second cavity 112 is formed between the sound generating unit 12 and an inner top wall of the second cover 118.

In the embodiment of the present application, the sound generating unit 12 may be a ball-top type sound generating unit, a tongue-spring type sound generating unit, or a cone-shaped sound generating unit. Referring to fig. 3 to 5, the sound generating unit 12 may include a frame 121, a voice coil 122 disposed in the frame 121, and a diaphragm 123 surrounding the voice coil 122 and exposed to the frame 121, wherein a washer 124 and a magnetic member 125 are sequentially disposed below the diaphragm 123, an iron core 126 is disposed below the magnetic member 125, and referring to fig. 7, a flexible circuit board 127 for electrically connecting to related electrical devices in the mobile terminal 20 is further led out of the speaker 10.

Referring to fig. 2 to 4, two opposite surfaces of the diaphragm 123 of the sound generating unit 12 respectively correspond to the first cavity 111 and the second cavity 112, a resonant cavity 114 is formed in the first cover 117, the resonant cavity 114 is communicated with the first cavity 111, a through hole 116 is formed in one side of the resonant cavity 114 facing the second cavity 112, the cover plate 13 covers the through hole 116, and a micro hole 115 communicated with the second cavity 112 is formed in the cover plate 13. In this embodiment, a side of the diaphragm 123 facing away from the magnetic element 125 corresponds to the first chamber 111, and a side of the diaphragm 123 facing the magnetic element 125 corresponds to the second chamber 112.

More specifically, unlike the prior art design in which the air release hole 31 is opened in the housing of the sound generating device 30 to communicate with the interior of the terminal device (as shown in fig. 1), in the embodiment of the present application, the second chamber 112 of the speaker 10 does not communicate with the interior space of the housing 21 of the mobile terminal 20. As shown in FIGS. 2-4, the resonant cavity 114 is in communication with the second chamber 112 through a micro-hole 115.

As shown in fig. 3, the following further describes the speaker 10 provided in the embodiment of the present application: in the speaker 10 provided in the embodiment of the present application, the sound generating unit 12 is disposed in the box body 11, and a first cavity 111 is formed between the sound generating unit 12 and the first cover 117 of the box body 11, a second cavity 112 is formed between the sound generating unit 12 and the second cover 118 of the box body 11, sound generated by the sound generating unit 12 is emitted to the external environment through the sound outlet 113, the first cavity 111 is communicated with the second cavity 112 through the resonant cavity 114, the cover plate 13 provided with the micro holes 115 is disposed at the through hole 116 of the resonant cavity 114, the resonant cavity 114 is communicated with the second cavity 112 through the micro holes 115, so that the first cavity 111 and the second cavity 112 of the speaker 10 can maintain air pressure balance through the resonant cavity 114, and further the diaphragm 123 of the sound generating unit 10 normally vibrates. Since the second chamber 112 and the resonant cavity 114 are communicated with each other through the micro holes 115, the air flow passing through the micro holes 115 is small, so that the air flow circulation in the second chamber 112 is reduced, and thus, when the box body 11 is pressed or returns to a normal state from the pressed state, the air flow enters and exits the second chamber 112 through the micro holes 115, so that the internal air pressure of the second chamber 112 does not change significantly, and since the first chamber 111 is usually communicated with the external environment through the sound outlet 113, the internal air pressure of the first chamber 111 does not change significantly, so that the amplitude of the diaphragm 123 of the generating unit 12 can be kept within a reasonable range during vibration, and thus the diaphragm 123 does not collide with the magnetic member 125 in the sound generating unit 12 during vibration, so that the tooth sound and metal sound of the speaker 10 during sound generation, especially during high-frequency sound generation, are effectively suppressed, the high-frequency sound output texture of the loudspeaker 10 is improved.

Through opening the through hole 116 on one side of the resonant cavity 114 and forming the micro hole 115 on the cover plate 13 covering the through hole 116, when the aperture size of the micro hole 115 needs to be changed, the cover plate 13 can be replaced by the cover plate 13 with the micro hole 115 with the corresponding aperture, so that the aperture of the micro hole 115 can be flexibly adjusted.

Optionally, the cover 13 may be embedded in the through opening 116 to improve the convenience of detaching the cover 13 from the second chamber 112, or may be adhered to the outer edge of the through opening 116 by gluing or hot melt adhesion, so as to improve the stability of assembling the cover 13 with respect to the second chamber 112.

Alternatively, the micro holes 115 may be shaped holes such as circular holes, elliptical holes, or rectangular holes. The particular choice of orifice type of the micropores 115 may be determined based on the exchange gas flow rate for which the second chamber 112 is designed.

In other embodiments of the present application, as shown in fig. 5 to 7, an enclosing frame 119 is disposed in the first cover 117, the sound generating unit 12 is embedded in the enclosing frame 119, a first region 16 is formed between an inner wall of the first cover 117 and an outer wall of the enclosing frame 119 at an interval, a block object 17 is disposed in the first region 16, the resonant cavity 114 is disposed in the block object 17, and the connecting channel 18 penetrates through the enclosing frame 119 and the block object 17 and is communicated with the resonant cavity 114.

Specifically, sound generating unit 12 and enclose the accessible between the frame 119 and beat to glue sealed, realized first cavity 111 and second cavity 112 isolation sealed like this on the one hand, on the other hand also makes sound generating unit 12 and encloses and cushion through the glue between the frame 119, eliminated sound generating unit 12 and enclosed the unnecessary vibration that collides with the production each other between the frame 119, promoted sound generating unit 12's play sound effect.

By forming the first region 16 between the inner wall of the first cover 117 and the outer wall of the surrounding frame 119 at an interval, and opening the resonant cavity 114 in the block object 17 in the first region 16, the assembly space in the box 11 is fully utilized, and the resonant cavity 114 is independently arranged with respect to the first chamber 111 and the second chamber 112.

Alternatively, the block member 17 may be integrally formed with the first cover 117, thereby reducing the manufacturing cost of the case 11. The block 17 may be formed separately and then fitted or glued into the first region 16. This makes it unnecessary to have the same material for the block 17 and the first cover 117, for example, the first cover 17 may be made of plastic, and the block 17 may be made of metal, etc. Meanwhile, the block piece may be in the shape of a square or a special-shaped block, and the shape thereof may be determined according to the size and shape of the assembly space reserved in the first region 16.

In other embodiments of the present application, as shown in fig. 3, 7 and 8, the case 11 further includes a porous member 14, and the porous member 14 is disposed on the cover 13 and covers the micro-holes 115.

Specifically, by covering the cover 13 with the porous member 14 and covering the pores 115 with the porous member 14, the porous member 14 and the pores 115 combine to further restrict the airflow to and from the second chamber 112, thereby further stabilizing the internal pressure of the second chamber 112.

Optionally, the porous article 14 may be detachably covered on the cover plate 13 by a double-sided tape, so that the airflow entering and exiting the second chamber 112 can be further precisely adjusted by replacing the porous article 14 with different thicknesses, and further, the internal air pressure of the second chamber 112 can be precisely controlled.

In other embodiments of the present application, the porous member 14 is attached to a side of the cover plate 13 facing toward or away from the resonant cavity 114.

Specifically, the porous member 14 may be selectively installed on the side of the cover plate 13 facing or facing away from the resonant cavity 114 according to the size of the installation space on the side of the cover plate 13 facing or facing away from the resonant cavity 114.

In other embodiments of the present application, as shown in fig. 7 to 9, a cavity 131 is formed on a side of the cover plate 13 facing or away from the resonant cavity 114, the porous object 14 is embedded in the cavity 131, and the micro-hole 115 is formed at a bottom of the cavity 131.

Specifically, by forming the cavity 131 in the cover plate 13 and embedding the porous article 14 in the cavity 131, on one hand, the stability of the connection between the porous article 14 and the cover plate 13 is improved, and on the other hand, the quick replacement of the porous article 14 relative to the cover plate 13 is facilitated.

Optionally, the porous article 14 is stuck in the cavity 131, which improves the stability of the assembly of the porous article 14 in the cavity 131. Meanwhile, the outer edge of the porous article 14 can be connected by gluing or attaching a double-sided adhesive to the wall of the cavity 131 or the edge of the bottom of the cavity 131, so that the air flow will not flow out from the gap between the porous article 14 and the wall of the cavity 131 when flowing through the micro-holes 115 to the porous article 14, but will mostly flow through the porous article 14 and into the second chamber 112 or the resonant cavity 114. This enhances the utilization of the porous article 14 and fully utilizes the airflow retarding effect of the porous article 14.

In other embodiments of the present application, a gap is formed between the outer edge of the porous article 14 and the walls of the cavity 131.

Specifically, by forming a gap between the outer edge of the porous piece 14 and the cavity wall of the cavity 131, the porous piece 14 can be easily pulled out of the cavity 131, so that the porous piece 14 can be quickly taken out of the cavity 131, and the assembly convenience of the porous piece 14 relative to the cavity 131 is also improved.

In other embodiments of the present application, the porous article 14 is a mesh 141, and the mesh 141 may be made of a nonwoven 142.

Specifically, by configuring the porous member 14 as the mesh 141, the holes are distributed uniformly and densely due to the better permeability of the mesh 141, so that the mesh and the micro holes 115 can cooperate to precisely adjust the flow rate of the air flowing into or out of the second chamber 112, and improve the smoothness and uniformity of the air flowing into or out of the second chamber 112. Also, the mesh 141 is readily available and inexpensive to manufacture, which also reduces the overall manufacturing cost of the speaker 10.

And benefit from the advantages of the non-woven fabric 142 that it is air permeable, flexible, light and non-toxic, it can effectively control the air flow in and out of the second chamber 112, and at the same time, it also improves the material selection environmental protection of the loudspeaker 10.

In other embodiments of the present application, as shown in fig. 10, the mesh cloth 141 may be formed by stacking a non-woven fabric 142 and a absorbent gauze layer 143, so that the mesh cloth 141 can effectively block fine impurities in the air from entering the second chamber 112, and further prevent the fine impurities from flowing freely between the first chamber 111 and the second chamber 112, so as to avoid the fine impurities from affecting the vibration of the diaphragm 123, and thus improve the sound output quality of the speaker 10.

Alternatively, the porous member 14 may be made of sponge or the like in consideration of cost.

In other embodiments of the present application, as shown in fig. 4, 5 and 11, as an alternative to the porous member 14, the box body 11 further includes a PET film, the PET film 15 covers a side of the cover plate 13 facing the resonant cavity 114, and a first ventilation area 152 (shown in fig. 4) communicating with the resonant cavity 114 is formed between the PET film 15 and the cover plate 13; alternatively, the PET film 15 covers a side of the cover plate 13 opposite to the resonant cavity 114, and a second ventilation region 151 (shown in FIG. 5) communicating with the second chamber 112 is formed between the PET film 15 and the cover plate 13.

Specifically, as shown in fig. 4, 5 and 11, in the present embodiment, the porous member 14 is replaced by the PET film 15, and the PET film 15 is covered on the cover plate 13, so that the airflow entering and exiting the second chamber 112 through the micro holes 115 can enter the resonant cavity 114 through the first ventilation area 152 or enter the second chamber 112 through the first ventilation area 151 under the blocking of the PET film 15, and the airflow entering and exiting the second chamber 112 can be effectively adjusted by controlling the size of the area of the first ventilation area 152 or the first ventilation area 151, so as to reduce the cost of adjusting the airflow entering and exiting the second chamber 112. Due to the good impact resistance and the non-toxic characteristic of the PET film 15, the PET film 15 can be stably in service for a long time in the loudspeaker 10, and meanwhile, the material selection environmental protection performance of the loudspeaker 10 is improved.

Alternatively, as shown in fig. 6, as an alternative to the design of the first ventilation area 152 or the first ventilation area 151, a plurality of ventilation holes 153 may be directly formed in the PET film 15, so that the PET film 15 has ventilation properties, and the airflow entering and exiting the second cavity 112 may directly flow into the second cavity 112 or the resonant cavity 114 through the ventilation holes 153 after passing through the micro holes 115, so that the ventilation structure of the PET film 15 may be simplified, and the overall manufacturing cost of the speaker 10 may be reduced.

In other embodiments of the present application, as shown in fig. 7 to 9, a connecting channel 18 is formed on an inner wall of the surrounding frame 119, the connecting channel 18 is communicated with the resonant cavity 114, and a cross-sectional area of the connecting channel 18 is larger than an opening area of the micro-hole 115. Specifically, the connecting channel 18 may be formed by machining or injection molding of the case 11.

By making the cross-sectional area of the connecting channel 18 larger than the opening area of the micro-hole 115, the speed of the gas flow entering the resonant cavity 114 from the first chamber 111 is larger than the speed of the gas flow entering the second chamber 112 from the resonant cavity 114, thereby reducing the speed of the gas flow exchange between the first chamber 111 and the second chamber 112.

In other embodiments of the present application, the cross-sectional area of connecting channel 18 is 2 to 15 times the open area of micropores 115. Specifically, by making the cross-sectional area of the connecting passage 18 2 to 15 times the opening area of the minute hole 115, it is possible to achieve precise control of the speed of the gas flow exchange between the first chamber 111 and the second chamber 112.

Alternatively, the cross-sectional area of connecting channel 18 is 4 to 9 times the open area of micropores 115. Specifically, the sectional area of the connecting channel 18 is 4 to 9 times the opening area of the micropores 115, so that the accurate control of the speed of the exchange of the airflow between the first chamber 111 and the second chamber 112 is realized, and the undersize of the opening area of the micropores 115 to meet the multiple relation of the opening area of the micropores and the sectional area of the connecting channel 18 is avoided, so that the airflow flowing in and out of the second chamber 112 is controlled, and the opening difficulty of the micropores 115 is reduced.

In other embodiments of the present application, the pores 115 have a pore size of 0.5mm to 2 mm. Specifically, by setting the pore diameter of the micro-pores 115 to 0.5mm to 2mm, the flow rate of the gas flowing into and out of the second chamber 112 is effectively controlled.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.