CN111343549A

CN111343549A - Loudspeaker box

Info

Publication number: CN111343549A
Application number: CN202010148081.5A
Authority: CN
Inventors: 令狐荣林; 肖波; 章统
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-06-26
Anticipated expiration: 2040-03-05
Also published as: CN111343549B; WO2021174572A1

Abstract

The invention provides a loudspeaker box capable of improving effective vibration area, which comprises a box body and a sound production device, wherein a containing cavity is divided into a front cavity and a rear cavity by a partition plate, a single body leakage hole of the partition plate is communicated with the rear cavity, a sound outlet hole of the box body is communicated with the front cavity, the sound production device is suspended in the front cavity and comprises a basin frame with a basin frame leakage hole, a vibration system and a magnetic circuit system, the vibration system comprises an upper vibration membrane and a lower vibration membrane which are encircled with the basin frame to form a containing space communicated with the basin frame leakage hole, and an upper voice coil and a lower voice coil which are respectively inserted into an inner magnetic gap and an outer magnetic gap, the magnetic circuit system comprises an inner magnetic part, a middle magnetic part forming an inner magnetic gap with the inner magnetic part, an outer magnetic part forming an outer magnetic gap with the middle magnetic part, a first pole core fixedly arranged on the inner magnetic part, a second pole core fixedly arranged on the middle magnetic part and the outer magnetic part and a third pole core fixedly arranged on the inner magnetic part and the middle, the middle magnetic part is provided with an air channel communicated with the outer magnetic gap and the inner magnetic gap.

Description

Loudspeaker box

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of acoustoelectric, in particular to a loudspeaker box applied to portable electronic products.

[ background of the invention ]

With the advent of the mobile internet age, the number of smart mobile devices is increasing. Among the mobile devices, the mobile phone is undoubtedly the most common and portable mobile terminal device. At present, the functions of a mobile phone are very diverse, one of which is a high-quality music function, and thus, a speaker box for playing sound is widely applied to the current smart mobile devices.

The loudspeaker box comprises a box body with a containing cavity and a sound production device arranged in the box body, and a sound hole penetrates through the box body. The sound-generating device in the related art has only one sound-generating surface, and thus is not favorable for improving the sensitivity of the speaker box.

Therefore, there is a need to provide a new speaker box to solve the above technical problems.

[ summary of the invention ]

The invention aims to provide a loudspeaker box, which can improve the effective vibration area and improve the sensitivity of the loudspeaker box.

In order to achieve the above object, the present invention provides a loudspeaker box, comprising a box body having a receiving cavity and a sound-producing device, wherein a partition plate is arranged in the box body and divides the receiving cavity into a front cavity and a rear cavity, the box body is provided with a sound outlet communicated with the front cavity in a penetrating manner, the partition plate is provided with a single body leakage hole communicated with the rear cavity in a penetrating manner, the sound-producing device is suspended in the front cavity, the sound-producing device comprises a basin frame abutted against the partition plate, a vibration system fixed on the basin frame and a magnetic circuit system for driving the vibration system to vibrate and produce sound, the basin frame is provided with a basin frame leakage hole communicated with the single body leakage hole in a penetrating manner, the vibration system comprises an upper vibration diaphragm and a lower vibration diaphragm which are respectively fixed on two opposite sides of the basin frame and have opposite vibration directions, an upper vibration diaphragm for driving the upper vibration diaphragm to vibrate and produce sound, a lower voice coil for driving the lower vibration diaphragm and a framework for connecting the lower voice coil and, the upper vibrating diaphragm, the lower vibrating diaphragm and the basin frame are enclosed to form an accommodating space for accommodating the magnetic circuit system, the accommodating space is communicated with the basin frame leakage hole, the magnetic circuit system comprises an inner magnetic part, a middle magnetic part which is arranged around the inner magnetic part and forms an inner magnetic gap with the inner magnetic part, an outer magnetic part which is arranged around the middle magnetic part and forms an outer magnetic gap with the middle magnetic part, a first pole core which is fixedly arranged on one side of the inner magnetic part facing the upper vibrating diaphragm, a second pole core which is fixedly arranged on one side of the middle magnetic part and the outer magnetic part facing the upper vibrating diaphragm, and a third pole core which is fixedly arranged on one side of the inner magnetic part and the middle magnetic part facing the lower vibrating diaphragm, the middle magnetic part is provided with an air passage which is communicated with the outer magnetic gap and the inner magnetic gap, the second pole core is fixedly arranged on the basin frame, and the upper voice coil is inserted into the inner magnetic gap, the lower voice coil is inserted into the outer magnetic gap.

Preferably, the basin frame leakage hole is located at a position of the basin frame corresponding to the magnetic circuit system, and the outer magnetic part is provided with a leakage channel communicating the outer magnetic gap and the basin frame leakage hole.

Preferably, the frame leakage hole, the air passage and the leakage passage are located on the same straight line.

Preferably, the outer magnetic part is composed of a plurality of outer permanent magnets arranged around the middle magnetic part, two adjacent outer permanent magnets are arranged at intervals, and the two outer permanent magnets adjacent to the leakage hole of the basin frame are arranged at intervals to form the leakage channel.

Preferably, the middle magnetic part is of a continuous annular structure, the middle magnetic part comprises a first surface and a second surface which are arranged oppositely along a vibration direction, and the air channel is formed by sinking from the first surface to the second surface.

Preferably, the vibration system further includes a frame, and the frame includes a first connecting portion connected to the lower diaphragm, a second connecting portion connected to the lower voice coil, and a third connecting portion connected to the first connecting portion and the second connecting portion.

Preferably, the first connecting portion and the second connecting portion are both in a ring structure.

Preferably, the vibration system further includes an upper dome and a lower dome disposed in the accommodating space, the upper dome is connected to the upper diaphragm and the upper voice coil along opposite sides in the vibration direction, and the lower dome is connected to the first connecting portion and the lower diaphragm along opposite sides in the vibration direction.

Preferably, the magnetic circuit system further comprises a fourth pole core fixed on one side of the outer magnetic part facing the lower diaphragm, and the fourth pole core is fixed on the basin stand.

Preferably, the sounder further comprises an upper end cover and a lower end cover, the upper vibrating diaphragm clamp is arranged between the basin frame and the upper end cover, the upper end cover is provided with a first sounding hole for the outward sounding of the upper vibrating diaphragm, the lower vibrating diaphragm clamp is arranged between the basin frame and the lower end cover, and the lower end cover is provided with a second sounding hole for the outward sounding of the lower vibrating diaphragm.

Compared with the prior art, the loudspeaker box has the advantages that the upper vibrating diaphragm and the lower vibrating diaphragm are arranged to be opposite in vibrating direction and driven by the upper voice coil and the lower voice coil respectively, and the sound generating device is arranged to be suspended in the front cavity, so that sound generated by the vibration of the upper vibrating diaphragm and the lower vibrating diaphragm is transmitted to the outside of the loudspeaker box through the sound outlet, and the effective vibrating area of the loudspeaker box is greatly increased, and the sensitivity of the loudspeaker box is improved; meanwhile, through the structural design of the magnetic circuit system, the magnetic circuit system is provided with the inner magnetic gap, the outer magnetic gap and the air passage communicated with the inner magnetic gap and the outer magnetic gap, so that when the upper vibrating diaphragm and the lower vibrating diaphragm vibrate, air flow in the accommodating space can circulate with the rear cavity through the basin frame leakage holes and the single body leakage holes. In addition, the upper voice coil and the lower voice coil are respectively inserted into the inner magnetic gap and the outer magnetic gap of the magnetic circuit system, so that the upper vibrating diaphragm and the lower vibrating diaphragm share the same magnetic circuit system, and the utilization rate of a magnetic circuit is improved.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a perspective view of a preferred embodiment of a speaker cabinet of the present invention;

FIG. 2 is a cross-sectional view of the loudspeaker enclosure of FIG. 1 taken along the direction A-A;

FIG. 3 is a cross-sectional view of the loudspeaker enclosure of FIG. 1 taken along the direction B-B;

FIG. 4 is a schematic structural view of a sound producing device in the loudspeaker enclosure of FIG. 2;

FIG. 5 is a schematic view of the sound producing device in the speaker box of FIG. 3;

FIG. 6 is an exploded perspective view of the sound device of FIG. 5;

FIG. 7 is an assembled structural view of a portion of the sound device shown in FIG. 6;

FIG. 8 is a schematic assembled magnetic circuit of the sounder device illustrated in FIG. 6;

fig. 9 is a schematic structural view of another angle of the magnetic circuit system shown in fig. 8.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 9, the speaker box includes a box body 100 having a receiving cavity 100A and a sound generating device 200 disposed in the box body 100.

Be equipped with in the box 100 with hold chamber 100A and separate for front chamber 100B and rear chamber 100C's baffle 101, run through on the baffle 101 be equipped with the monomer hole 102 that leaks of rear chamber 100C intercommunication, run through on the box 100 be equipped with the hole 103 that gives sound of front chamber 100B intercommunication, sound production device 200 is suspended in the front chamber 100B.

The sounder 200 includes a frame 1 abutting against the partition 101, a vibration system 3 fixed on the frame 1, and a magnetic circuit system 5 for driving the vibration system 3 to vibrate and sound.

The basin stand 1 is in a rectangular structure. A basin frame leakage hole 1A is arranged on the basin frame 1 in a penetrating mode. Specifically, the frame leakage holes 1A are located on the side wall of the frame 1 abutting against the partition plate 101 so that the frame leakage holes 1A communicate with the single body leakage holes 102.

Vibration system 3 includes vibrating diaphragm 31, lower vibrating diaphragm 33, goes up voice coil 34 and lower voice coil 35, go up vibrating diaphragm 31 with lower vibrating diaphragm 33 is fixed in respectively the relative both sides of basin frame 1, just go up vibrating diaphragm 31 down vibrating diaphragm 33 reaches 1 encloses to close and forms and accepts basin frame 5's accommodating space 200A, accommodating space 200A with basin frame leakage hole 1A intercommunication, go up voice coil 34 drive go up vibrating diaphragm 31 vibration sound production, down the drive of voice coil 35 vibrating diaphragm 33 vibration sound production down.

It should be noted that the vibration directions of the upper diaphragm 31 and the lower diaphragm 33 are opposite to each other, which means that the instantaneous vibration directions are opposite to each other. Specifically, when the upper diaphragm 31 vibrates in a direction away from the magnetic circuit 5, the lower diaphragm 33 also vibrates in a direction away from the magnetic circuit 5; when the upper diaphragm 31 vibrates in a direction approaching the magnetic circuit 5, the lower diaphragm 33 also vibrates in a direction approaching the magnetic circuit 5.

In this embodiment, the vibration system 3 further includes a bobbin 36, and the bobbin 36 connects the lower voice coil 35 and the lower diaphragm 33.

The bobbin 36 includes a first connection portion 361 connected to the lower diaphragm 33, a second connection portion 362 connected to the lower voice coil 35, and a third connection portion 363 connecting the first connection portion 361 and the second connection portion 362.

In this embodiment, the first connecting portion 361 and the second connecting portion 362 are both in a ring structure. It is to be understood that the first connection portion 361 and the second connection portion 362 are not limited to this embodiment; for example, in other embodiments, the first connecting portion 361 may be configured to have a flat plate shape; the second connection portion 362 may be formed of a plurality of separate structures, and each separate structure may be connected to the lower voice coil 35.

In this embodiment, the frame 36 is an integrally formed structure. It is understood that, in other embodiments, the first connection portion 361, the second connection portion 362 and the third connection portion 363 may be formed by welding.

In order to enhance the vibration effect of the upper diaphragm 31 and the lower diaphragm 35 to improve the acoustic performance of the sounder device 200. In this embodiment, the vibration system 3 further includes an upper dome 37 and a lower dome 38 disposed in the receiving space 200A, two opposite sides of the upper dome 37 along the vibration direction X are respectively connected to the upper diaphragm 31 and the upper voice coil 34, and two opposite sides of the lower dome 38 along the vibration direction X are respectively connected to the first connecting portion 361 and the lower diaphragm 33. It is understood that, in other embodiments, the upper dome 37 and the lower dome 38 may also be disposed outside the receiving space 200A, and two opposite sides of the upper diaphragm 31 along the vibration direction X are respectively connected to the upper voice coil 34 and the upper dome 37, and two opposite sides of the lower diaphragm 33 along the vibration direction X are respectively connected to the lower dome 38 and the first connecting portion 361.

As shown in fig. 4, 5 and 6, the sound generating device 200 further includes an upper end cover 7 and a lower end cover 9, the upper diaphragm 31 is clamped between the basin frame 1 and the upper end cover 7, the upper end cover 7 has a first sound emitting hole 71 for the upper diaphragm 31 to emit sound outwards, the lower diaphragm 33 is clamped between the basin frame 1 and the lower end cover 9, and the lower end cover 9 has a second sound emitting hole 91 for the lower diaphragm 33 to emit sound outwards. The upper end cover 7 and the lower end cover 9 are arranged, so that the upper vibrating diaphragm 31 and the lower vibrating diaphragm 33 can be better fixed on the frame 1.

In this embodiment, the box 100 includes an upper bottom surface 104 opposite to the upper cover 7 and disposed at an interval, and a lower bottom surface 105 opposite to the lower cover 9 and disposed at an interval, wherein the upper bottom surface 104 is provided with a plurality of first spacers 106 for supporting the upper cover 7, and the lower bottom surface 105 is provided with a plurality of second spacers 107 for supporting the lower cover 9. The sounder device 200 is suspended within the front cavity 100B by the support of the first plurality of blocks 106 and the second plurality of blocks 107. As shown in fig. 3, the first block 106 and the second block 107 are integrally formed with the box 100, it is understood that in other embodiments, the first block 106 may be a block fixed on the upper bottom surface 104, and the second block 107 may be a block fixed on the lower bottom surface 105.

The magnetic circuit system 5 includes an inner magnetic portion 51, a middle magnetic portion 52 surrounding the inner magnetic portion 51 and forming an inner magnetic gap 5A with the inner magnetic portion 51, an outer magnetic portion 53 surrounding the middle magnetic portion 52 and forming an outer magnetic gap 5B with the middle magnetic portion 52, a first pole core 54 fixedly disposed on one side of the inner magnetic portion 51 facing the upper diaphragm 31, a second pole core 55 fixedly disposed on one side of the middle magnetic portion 52 and the outer magnetic portion 53 facing the upper diaphragm 31, and a third pole core 56 fixed on one side of the inner magnetic portion 51 and the middle magnetic portion 52 facing the lower diaphragm 33, the middle magnetic portion 52 has an air passage 52A communicating the outer magnetic gap 5B and the inner magnetic gap 5A, and the second pole core 55 is fixed to the frame 1. Wherein the upper voice coil 34 is inserted into the inner magnetic gap 5A, and the lower voice coil 35 is inserted into the outer magnetic gap 5B. After the upper voice coil 34 is powered on, under the magnetic action of the magnetic circuit system 5, the upper diaphragm 31 vibrates together with the upper voice coil 34; after the lower voice coil 35 is powered on, the lower diaphragm 33 and the bobbin 36 vibrate together with the lower voice coil 35 under the magnetic force of the magnetic circuit system 5. Since the upper diaphragm 31 and the lower diaphragm 33 are arranged to vibrate in opposite directions and are driven by the upper voice coil 34 and the lower voice coil 35 to generate sound, respectively, and the sound generating device 200 is arranged to be suspended in the front cavity 100B, the sound generated by the vibration of the upper diaphragm 31 and the lower diaphragm 33 is transmitted to the outside of the speaker box through the sound outlet holes 103, so that the effective vibration area of the speaker box is greatly increased to improve the sensitivity of the speaker box; meanwhile, since the magnetic circuit system 5 has the inner magnetic gap 5A, the outer magnetic gap 5B, and the air passage 52A communicating the inner magnetic gap 5A and the outer magnetic gap 5B, when the upper diaphragm 31 and the lower diaphragm 33 vibrate, the air flow in the accommodating space 200A can flow through the frame leakage hole 1A and the single body leakage hole 102 and the rear cavity 100C. In addition, the upper voice coil 34 and the lower voice coil 35 are respectively inserted into the inner magnetic gap 5A and the outer magnetic gap 5B of the magnetic circuit system 5, so that the upper diaphragm 31 and the lower diaphragm 33 share the same magnetic circuit system, and the utilization rate of the magnetic circuit is improved.

In the present embodiment, the magnetic circuit system 5 further includes a fourth pole core 57 fixed on a side of the outer magnetic portion 53 facing the lower diaphragm 33, and the fourth pole core 57 is fixed on the frame 1. Through the magnetic conduction effect of the first pole core 54, the second pole core 55, the third pole core 56 and the fourth pole core 57, the magnetic fluxes in the inner magnetic gap 5A and the outer magnetic gap 5B can be effectively increased, so that the acoustic performance of the sound production device 200 can be improved, and the sound production device 200 is also beneficial to the light and thin design. Meanwhile, since the second pole piece 55 and the fourth pole piece 57 are both fixed on the frame 1, the magnetic circuit system 5 can be better fixed on the frame 1.

In the present embodiment, the first pole piece 54 and the second pole piece 55 are located on the same horizontal plane, and the third pole piece 56 and the fourth pole piece 57 are also located on the same horizontal plane.

In this embodiment, the frame leakage hole 1A is located at a position where the frame 1 corresponds to the magnetic circuit system 5, and the outer magnetic portion 53 has a leakage passage 53A communicating the outer magnetic gap 5B and the frame leakage hole 1A. That is, the frame leakage hole 1A communicates with the receiving space 200A through the outer magnetic gap 5B, the leakage passage 53A, and the air passage 52A (i.e., the frame leakage hole 1A indirectly communicates with the receiving space 200A). It is understood that in other embodiments, the frame leakage hole 1A may be located at a position where the frame 1 does not correspond to the magnetic circuit system 5 (i.e., the frame leakage hole 1A directly communicates with the receiving space 200A), and accordingly, the outer magnetic part may not have a leakage path.

In this embodiment, the frame leakage hole 1A, the air passage 52A and the leakage passage 53A are located on the same straight line. This reduces the distance between the magnetic circuit 5 and the upper diaphragm 31 and between the air flow in the inner magnetic gap 5A and the outside.

In the present embodiment, the internal magnetic portion 51 is an internal permanent magnet. It is understood that, in other embodiments, the inner magnetic portion 51 may also be formed by two, three, etc. inner permanent magnets which are stacked along the vibration direction X, and a pole core may also be interposed between two adjacent inner permanent magnets.

In this embodiment, the middle magnetic part 52 has a continuous ring-shaped structure, the middle magnetic part 52 includes a first surface 521 and a second surface 523 which are oppositely arranged along the vibration direction X, and the air passage 52A is formed by recessing from the first surface 521 to the second surface 523. As shown in fig. 4, the middle magnetic part 52 is a middle permanent magnet, the first surface 521 is a surface of the middle magnetic part 52 facing the second pole core 55, and the second surface 523 is a surface of the middle magnetic part 52 facing the third pole core 56, it is understood that the arrangement manner of the middle magnetic part 52 is not limited thereto. For example, in other embodiments, the first surface may also be a surface of the middle magnetic part 52 facing the third pole core 56, and correspondingly, the second surface is a surface of the middle magnetic part 52 facing the second pole core 55; the middle magnetic part 52 can be formed by two, three or other middle permanent magnets in a continuous annular structure which are overlapped along the vibration direction X, and a pole core can be further clamped between two adjacent middle permanent magnets; the middle magnetic part 52 may be formed by a plurality of middle permanent magnets surrounding the inner magnetic part 51, and two adjacent middle permanent magnets may be spaced apart from each other. Wherein at least two of the middle permanent magnets adjacent to the leakage passage 53A are disposed at intervals to form the air passage 52A.

In this embodiment, the outer magnetic portion 53 is formed by a plurality of outer permanent magnets surrounding the middle magnetic portion 52, and two adjacent outer permanent magnets are spaced apart from each other. Two outer permanent magnets adjacent to the basin frame leakage hole 1A are arranged at intervals to form the leakage channel 53A. It can be understood that, in other embodiments, the outer magnetic portion 53 may also be an outer permanent magnet in an annular structure, and accordingly, a leakage channel communicating the outer magnetic gap and the frame leakage hole needs to be provided at a position of the outer permanent magnet corresponding to the frame leakage hole.

The inner permanent magnet, the middle permanent magnet and the outer permanent magnet are usually made of magnetic steel. It is understood that the inner permanent magnet, the middle permanent magnet and the outer permanent magnet may be natural magnets.

Compared with the related art, the loudspeaker box of the invention has the advantages that the upper vibrating diaphragm 31 and the lower vibrating diaphragm 33 are arranged to have opposite vibrating directions and are respectively driven by the upper voice coil 34 and the lower voice coil 35, and the sound generating device 200 is arranged to be suspended in the front cavity 100B, so that the sound generated by the vibration of the upper vibrating diaphragm 31 and the lower vibrating diaphragm 33 is transmitted to the outside of the loudspeaker box through the sound outlet hole 103, and the effective vibrating area of the loudspeaker box is greatly increased to improve the sensitivity of the loudspeaker box; meanwhile, through the structural design of the magnetic circuit system 5, the magnetic circuit system 5 has the inner magnetic gap 5A, the outer magnetic gap 5B and the air passage 52A communicating the inner magnetic gap 5A and the outer magnetic gap 5B, so that when the upper diaphragm 31 and the lower diaphragm 33 vibrate, the airflow in the accommodating space 200A can flow through the basin frame leakage hole 1A and the single body leakage hole 102 and the rear cavity 100C. In addition, the upper voice coil 34 and the lower voice coil 35 are respectively inserted into the inner magnetic gap 5A and the outer magnetic gap 5B of the magnetic circuit system 5, so that the upper diaphragm 31 and the lower diaphragm 33 share the same magnetic circuit system, thereby improving the utilization rate of the magnetic circuit.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

1. A loudspeaker box comprises a box body with a containing cavity and a sound production device, and is characterized in that a partition board which is used for dividing the containing cavity into a front cavity and a rear cavity is arranged in the box body, a sound outlet which is communicated with the front cavity is arranged on the box body in a penetrating mode, a monomer leakage hole which is communicated with the rear cavity is arranged on the partition board in a penetrating mode, the sound production device is suspended in the front cavity, the sound production device comprises a basin frame which is abutted to the partition board and a magnetic circuit system which is fixedly held on the basin frame and drives the vibration system to vibrate and produce sound, a basin frame leakage hole which is communicated with the monomer leakage hole is arranged on the basin frame in a penetrating mode, the vibration system comprises an upper vibration film and a lower vibration film which are fixed on the two opposite sides of the basin frame respectively and have opposite vibration directions, and a voice coil and a lower voice coil which are used for vibrating and producing sound, the upper vibrating diaphragm, the lower vibrating diaphragm and the basin frame are enclosed to form an accommodating space for accommodating the magnetic circuit system, the accommodating space is communicated with the basin frame leakage hole, the magnetic circuit system comprises an inner magnetic part, a middle magnetic part which is arranged around the inner magnetic part and forms an inner magnetic gap with the inner magnetic part, an outer magnetic part which is arranged around the middle magnetic part and forms an outer magnetic gap with the middle magnetic part, a first pole core which is fixedly arranged on one side of the inner magnetic part facing the upper vibrating diaphragm, a second pole core which is fixedly arranged on one side of the middle magnetic part and the outer magnetic part facing the upper vibrating diaphragm, and a third pole core which is fixedly arranged on one side of the inner magnetic part and the middle magnetic part facing the lower vibrating diaphragm, the middle magnetic part is provided with an air passage which is communicated with the outer magnetic gap and the inner magnetic gap, the second pole core is fixedly arranged on the basin frame, and the upper voice coil is inserted into the inner magnetic gap, the lower voice coil is inserted into the outer magnetic gap.

2. The speaker box according to claim 1, wherein the frame leakage hole is located at a position of the frame corresponding to the magnetic circuit system, and the outer magnetic portion has a leakage path communicating the outer magnetic gap and the frame leakage hole.

3. A loudspeaker enclosure according to claim 2, wherein the frame leak hole, the air duct and the leak channel are located in the same line.

4. The speaker box according to claim 2 or 3, wherein the outer magnetic portion is formed of a plurality of outer permanent magnets disposed around the middle magnetic portion, and two adjacent outer permanent magnets are disposed at intervals, wherein two outer permanent magnets adjacent to the frame leakage hole are disposed at intervals to form the leakage path.

5. A loudspeaker enclosure according to claim 1, 2 or 3, wherein the central magnetic portion is of a continuous annular configuration and comprises first and second surfaces disposed opposite to each other in the direction of vibration, the air passage being formed recessed from the first surface to the second surface.

6. The speaker box of claim 1, wherein the vibration system further comprises a bobbin, the bobbin comprising a first connection portion connected to the lower diaphragm, a second connection portion connected to the lower voice coil, and a third connection portion connecting the first connection portion and the second connection portion.

7. A loudspeaker enclosure according to claim 6, wherein the first and second connections are each of annular configuration.

8. The speaker box of claim 6, wherein the vibration system further comprises an upper dome and a lower dome disposed in the receiving space, the upper dome is connected to the upper diaphragm and the upper voice coil along opposite sides in the vibration direction, and the lower dome is connected to the first connection portion and the lower diaphragm along opposite sides in the vibration direction.

9. A loudspeaker enclosure according to claim 1, wherein the magnetic circuit further comprises a fourth pole core fixed to the outer magnet portion on a side facing the lower diaphragm, the fourth pole core being fixed to the frame.

10. The loudspeaker box of claim 1, wherein the sound producing device further comprises an upper end cover and a lower end cover, the upper diaphragm clamp is arranged between the basin frame and the upper end cover, the upper end cover is provided with a first sound producing hole for the upper diaphragm to produce sound outwards, the lower diaphragm clamp is arranged between the basin frame and the lower end cover, and the lower end cover is provided with a second sound producing hole for the lower diaphragm to produce sound outwards.