WO2021174572A1

WO2021174572A1 - Loudspeaker enclosure

Info

Publication number: WO2021174572A1
Application number: PCT/CN2020/078766
Authority: WO
Inventors: 令狐荣林; 肖波; 章统
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-03-05
Filing date: 2020-03-11
Publication date: 2021-09-10
Also published as: CN111343549B; CN111343549A

Abstract

The present invention provides a loudspeaker enclosure capable of increasing an effective vibration area. The loudspeaker enclosure comprises an enclosure body and a sound production device. An accommodating cavity is divided into a front cavity and a rear cavity by a partition plate, a single unit leakage hole of the partition plate is in communication with the rear cavity, a sound outlet hole of the box body is in communication with the front cavity, and the sound production device is suspended in the front cavity. The sound production device comprises a frame with a frame leakage hole, a vibration system and a magnetic circuit system, wherein the vibration system comprises an upper vibrating diaphragm and a lower vibrating diaphragm that are used for enclosing an accommodating space in communication with the frame leakage hole together with the frame, and an upper voice coil and a lower voice coil that are respectively inserted into an inner magnetic gap and an outer magnetic gap; and the magnetic circuit system comprises an inner magnetic part, a middle magnetic part forming the inner magnetic gap with the inner magnetic part, an outer magnetic part forming the 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 magnetic part, and the middle magnetic part is provided with an air channel enabling the outer magnetic gap to be in communication with the inner magnetic gap.

Description

Speaker box

Technical field

The invention relates to the field of sound and electricity, in particular to a speaker box used in portable electronic products.

Background technique

With the advent of the mobile Internet era, the number of smart mobile devices continues to rise. Among many mobile devices, mobile phones are undoubtedly the most common and most portable mobile terminal devices. At present, the functions of mobile phones are extremely diverse, one of which is high-quality music functions. Therefore, speaker boxes for playing sound are widely used in today's smart mobile devices.

The speaker box includes a box body with an accommodating cavity and a sound device arranged in the box body, and a sound hole is penetrated through the box body. The sound emitting device in the related art only has one sound emitting surface, which is not conducive to the improvement of the sensitivity of the speaker box.

Therefore, it is necessary to provide a new speaker box to solve the above technical problems.

technical problem

The object of the present invention is to provide a speaker box, which can increase the effective vibration area, thereby improving the sensitivity of the speaker box.

Technical solutions

In order to achieve the above-mentioned object, the present invention provides a loudspeaker box, which includes a box body with a containing cavity and a sound emitting device. A sound hole communicating with the front cavity is penetrated on the box body, a monomer leakage hole communicating with the rear cavity is penetrated on the partition board, and the sound generating device is suspended in the front cavity, The sound device includes a basin frame abutting with the partition, a vibration system fixed on the basin frame, and a magnetic circuit system that drives the vibration system to vibrate and emit sound. A basin frame leakage hole communicated with a body leakage hole, the vibration system includes an upper diaphragm and a lower diaphragm that are respectively fixed on opposite sides of the basin frame and have opposite vibration directions, and an upper sound that drives the upper diaphragm to vibrate and produce sound A ring, a lower voice coil that drives the lower diaphragm to vibrate and produce sound, and a skeleton connecting the lower voice coil and the lower diaphragm, the upper diaphragm, the lower diaphragm, and the basin frame are enclosed to form a housing The accommodating space of the magnetic circuit system, the accommodating space communicates with the leakage hole of the basin frame, and the magnetic circuit system includes an inner magnetic part, which is arranged around the inner magnetic part and forms an inner magnetic part with the inner magnetic part. The middle magnetic part of the magnetic gap, the outer magnetic part that is arranged around the middle magnetic part and forms an outer magnetic gap with the middle magnetic part, and is fixed on the side of the inner magnetic part facing the upper diaphragm The first pole core, the second pole core fixed on the side of the middle magnetic part and the outer magnetic part facing the upper diaphragm, and the second pole core fixed on the inner magnetic part and the middle magnetic part facing the The third pole core on one side of the lower diaphragm, the middle magnetic part has an air passage connecting the outer magnetic gap and the inner magnetic gap, the second pole core is fixed to the basin frame, and the upper The voice coil is inserted into the inner magnetic gap, and the lower voice coil is inserted into the outer magnetic gap.

Preferably, the basin frame leakage hole is located at a position corresponding to the basin frame and the magnetic circuit system, and the outer magnetic part has a leakage passage connecting the outer magnetic gap and the basin frame leakage hole.

Preferably, the leakage hole of the basin frame, 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, and two adjacent outer permanent magnets are arranged at intervals, wherein the two adjacent to the basin leakage hole The outer permanent magnets are arranged at intervals to form the leakage channel.

Preferably, the middle magnetic part is in a continuous ring structure, the middle magnetic part includes a first surface and a second surface arranged opposite to each other in a vibration direction, and the air passage extends from the first surface to the second surface. The surface is recessed.

Preferably, the vibration system further includes a skeleton, the skeleton including a first connecting portion connected with the lower diaphragm, a second connecting portion connected with the lower voice coil, and connecting the first connecting portion and the lower voice coil. The third connecting portion of the second connecting portion.

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

Preferably, the vibration system further includes an upper dome and a lower dome arranged in the receiving space, and the upper dome is respectively connected to the upper diaphragm and the upper sound at two opposite sides in the vibration direction. Ring connection, the opposite sides of the lower dome in the vibration direction are respectively connected with the first connecting portion and the lower diaphragm.

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

Preferably, the sound emitting device further includes an upper end cover and a lower end cover, the upper diaphragm is sandwiched between the basin frame and the upper end cover, and the upper end cover is provided for the upper diaphragm to emit sound outwards. The lower diaphragm is sandwiched between the basin frame and the lower end cover, and the lower end cover has a second sound hole for the lower diaphragm to emit sound outward.

Beneficial effect

Compared with the related art, the speaker box of the present invention arranges the upper diaphragm and the lower diaphragm to vibrate in opposite directions and is driven by the upper voice coil and the lower voice coil respectively, and the sound is generated. The device is arranged to be suspended in the front cavity, so that the sound generated by the vibration of the upper diaphragm and the lower diaphragm is transmitted to the outside of the speaker box through the sound outlet, so that the effective vibration area of the speaker box Significantly improve the sensitivity of the speaker box; at the same time, through the structural design of the magnetic circuit system, the magnetic circuit system has the inner magnetic gap, the outer magnetic gap, and the inner magnetic gap and the outer magnetic gap. The air passage of the magnetic gap, so that when the upper diaphragm and the lower diaphragm vibrate, the airflow in the accommodating space can pass through the basin frame leakage hole and the monomer leakage hole and the rear Cavity circulation. In addition, by inserting the upper voice coil and the lower voice coil into the inner magnetic gap and the outer magnetic gap of the magnetic circuit system, respectively, the upper diaphragm and the lower diaphragm share the same A magnetic circuit system, thereby improving the utilization rate of the magnetic circuit.

Description of the drawings

In order to explain the technical solutions in the embodiments of the present invention more clearly, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings, among which:

Figure 1 is a perspective view of a preferred embodiment of the speaker box of the present invention;

Figure 2 is a cross-sectional view of the speaker box shown in Figure 1 along the A-A direction;

Figure 3 is a cross-sectional view of the speaker box shown in Figure 1 along the B-B direction;

Fig. 4 is a schematic diagram of the structure of the sound emitting device in the speaker box shown in Fig. 2;

FIG. 5 is a schematic diagram of the structure of the sound emitting device in the speaker box shown in FIG. 3;

Fig. 6 is a three-dimensional exploded view of the sound generating device shown in Fig. 5;

FIG. 7 is a schematic structural diagram of part of the structure of the sound generating device shown in FIG. 6 after being assembled;

FIG. 8 is a schematic diagram of the assembled structure of the magnetic circuit system in the sound generating device shown in FIG. 6;

Fig. 9 is a schematic structural diagram of the magnetic circuit system shown in Fig. 8 from another angle.

Embodiments of the present invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Please refer to FIG. 1 to FIG. 9 in combination. The speaker box includes a box body 100 having an accommodating cavity 100A and a sound emitting device 200 arranged in the box body 100.

The box body 100 is provided with a partition 101 that divides the containing chamber 100A into a front chamber 100B and a rear chamber 100C, and the partition 101 is provided with a monomer leakage hole 102 that communicates with the rear chamber 100C. The box body 100 is provided with a sound outlet 103 communicating with the front cavity 100B, and the sound emitting device 200 is suspended in the front cavity 100B.

The sound generating device 200 includes a basin frame 1 abutting against the partition 101, a vibration system 3 fixed to the basin frame 1, and a magnetic circuit system 5 that drives the vibration system 3 to vibrate and produce sound.

The basin frame 1 has a rectangular structure. The basin frame 1 is provided with a basin frame leakage hole 1A through it. Specifically, the basin frame leakage hole 1A is located on the side wall where the basin frame 1 abuts the partition 101 so that the basin frame leakage hole 1A communicates with the monomer leakage hole 102.

The vibration system 3 includes an upper diaphragm 31, a lower diaphragm 33, an upper voice coil 34, and a lower voice coil 35. The upper diaphragm 31 and the lower diaphragm 33 are respectively fixed to two opposite sides of the basin frame 1. Side, and the upper diaphragm 31, the lower diaphragm 33, and the basin frame 1 enclose to form a receiving space 200A for accommodating the magnetic circuit system 5, the receiving space 200A and the basin frame leakage hole 1A Connected, the upper voice coil 34 drives the upper diaphragm 31 to vibrate and sound, and the lower voice coil 35 drives the lower diaphragm 33 to vibrate and sound.

It should be noted that the opposite vibration directions of the upper diaphragm 31 and the lower diaphragm 33 mean that the instantaneous vibration directions are opposite. Specifically, when the upper diaphragm 31 vibrates in a direction away from the magnetic circuit system 5, the lower diaphragm 33 also vibrates in a direction away from the magnetic circuit system 5; the upper diaphragm 31 vibrates in a direction closer to the magnetic circuit system 5. When the circuit system 5 vibrates, the lower diaphragm 33 also vibrates in a direction close to the magnetic circuit system 5.

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

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

In this embodiment, the first connecting portion 361 and the second connecting portion 362 both have a ring structure. It can be understood that the implementation of the first connecting portion 361 and the second connecting portion 362 is not limited to this; for example, in other embodiments, the first connecting portion 361 may be provided in a flat plate shape; The second connecting portion 362 may be configured to be composed of multiple split structures, and each split structure is connected to the lower voice coil 35 respectively.

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

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

As shown in Figs. 4, 5, and 6, the sound emitting device 200 further includes an upper end cover 7 and a lower end cover 9, and the upper diaphragm 31 is sandwiched between the basin frame 1 and the upper end cover 7. The upper end cover 7 has a first sounding hole 71 for the upper diaphragm 31 to emit sound outward, the lower diaphragm 33 is sandwiched between the basin frame 1 and the lower end cover 9, and the lower end The cover 9 has a second sound hole 91 for the lower diaphragm 33 to sound outward. The arrangement of the upper end cover 7 and the lower end cover 9 can better fix the upper diaphragm 31 and the lower diaphragm 33 on the basin frame 1.

In this embodiment, the box body 100 includes an upper bottom surface 104 opposite to the upper end cover 7 and spaced apart, and a lower bottom surface 105 opposite to the lower end cover 9 and spaced apart. The upper bottom surface 104 is provided with A plurality of first cushion blocks 106 supporting the upper end cover 7, and a plurality of second cushion blocks 107 supporting the lower end cover 9 are provided on the lower bottom surface 105. The sound generating device 200 is suspended in the front cavity 100B through the supporting action of the plurality of first pad blocks 106 and the plurality of second pad blocks 107. As shown in FIG. 3, the first spacer block 106 and the second spacer block 107 are integrally formed with the box body 100. It is understood that, in other embodiments, the first spacer block 106 may also It is a cushion block fixed on the upper bottom surface 104, and the second cushion block 107 may also be a cushion block fixed on the lower bottom surface 105.

The magnetic circuit system 5 includes an inner magnetic part 51, a middle magnetic part 52 arranged around the inner magnetic part 51 and forming an inner magnetic gap 5A between the inner magnetic part 51, and a middle magnetic part 52 arranged around the inner magnetic part 52 and The outer magnetic portion 53 forming an outer magnetic gap 5B between the inner magnetic portion 52 and the first pole core 54 fixed on the side of the inner magnetic portion 51 facing the upper diaphragm 31 is fixed on the The middle magnetic portion 52 and the outer magnetic portion 53 face the second pole core 55 on the side of the upper diaphragm 31 and are fixed to the inner magnetic portion 51 and the middle magnetic portion 52 toward the lower diaphragm. The third pole core 56 on the 33 side, the middle magnetic portion 52 has an air passage 52A connecting the outer magnetic gap 5B and the inner magnetic gap 5A, and the second pole core 55 is fixed to the basin 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 energized, under the magnetic force of the magnetic circuit system 5, the upper diaphragm 31 vibrates along with the upper voice coil 34; after the lower voice coil 35 is energized, the magnetic Under the action of the magnetic force of the circuit system 5, the lower diaphragm 33 and the skeleton 36 vibrate together with the lower voice coil 35. Since the upper diaphragm 31 and the lower diaphragm 33 are arranged to vibrate in opposite directions and are respectively driven by the upper voice coil 34 and the lower voice coil 35 to produce sound, and the sound emitting 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 103, so that the effective vibration area of the speaker box is greatly increased In order to improve the sensitivity of the speaker box; at the same time, because the magnetic circuit system 5 has the inner magnetic gap 5A, the outer magnetic gap 5B, and the air passage connecting the inner magnetic gap 5A and the outer magnetic gap 5B 52A, when the upper diaphragm 31 and the lower diaphragm 33 vibrate, the airflow in the receiving space 200A can pass through the basin frame leakage hole 1A, the monomer leakage hole 102 and the rear cavity 100C Circulation. In addition, since the upper voice coil 34 and the lower voice coil 35 are inserted into the inner magnetic gap 5A and the outer magnetic gap 5B of the magnetic circuit system 5, respectively, the upper diaphragm 31 and the As described below, the diaphragm 33 shares the same magnetic circuit system, which improves the utilization rate of the magnetic circuit.

In this embodiment, the magnetic circuit system 5 further includes a fourth pole core 57 fixed on the side of the outer magnetic portion 53 facing the lower diaphragm 33, and the fourth pole core 57 is fixed on the Basin frame 1. Through the magnetic permeability of the first pole core 54, the second pole core 55, the third pole core 56, and the fourth pole core 57, the inner magnetic gap 5A and the outer magnetic gap 5B can be effectively increased. Therefore, the acoustic performance of the sound emitting device 200 can be improved, and it is also conducive to the light and thin design of the sound emitting device 200. At the same time, since the second pole core 55 and the fourth pole core 57 are both fixed to the basin frame 1, the magnetic circuit system 5 can be better held on the basin frame 1.

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

In this embodiment, the basin frame leakage hole 1A is located at a position corresponding to the basin frame 1 and the magnetic circuit system 5, and the outer magnetic portion 53 has a connection between the outer magnetic gap 5B and the basin frame. The leak passage 53A of the leak hole 1A. In other words, the basin frame leakage hole 1A communicates with the containing space 200A through the outer magnetic gap 5B, the leakage passage 53A, and the air passage 52A (that is, the basin frame leakage hole 1A is indirectly connected to the receiving space 200A). The containment space 200A is connected). It is understandable that, in other embodiments, the basin frame leakage hole 1A may be located at a position where the basin frame 1 does not correspond to the magnetic circuit system 5 (that is, the basin frame leakage hole 1A is directly connected to the The accommodating space 200A is connected), and accordingly, the outer magnetic part may not have a leakage channel.

In this embodiment, the basin frame leakage hole 1A, the air passage 52A, and the leakage passage 53A are located on the same straight line. In this way, the space between the magnetic circuit system 5 and the upper diaphragm 31 and the distance between the air flow in the inner magnetic gap 5A and the outside can be reduced.

In this embodiment, the inner magnetic part 51 is an inner permanent magnet. It is understandable that in other embodiments, the inner magnetic portion 51 may also be formed by superimposing two, three, etc., inner permanent magnets along the vibration direction X, and there may also be a sandwich between two adjacent inner permanent magnets. Pole core.

In this embodiment, the middle magnetic part 52 has a continuous ring structure. The middle magnetic part 52 includes a first surface 521 and a second surface 523 disposed opposite to each other along the vibration direction X. The air passage 52A is free from the The first surface 521 is recessed toward the second surface 523. As shown in FIG. 4, the middle magnetic part 52 is a middle permanent magnet, the first surface 521 is the surface of the middle magnetic part 52 facing the second pole core 55, and the second surface 523 is the The middle magnetic part 52 faces the surface of the third pole core 56. It is understood that the arrangement of the middle magnetic part 52 is not limited to this. For example, in other embodiments, the first surface may also be the surface of the middle magnetic portion 52 facing the third pole core 56. Correspondingly, the second surface is the surface of the middle magnetic portion 52 facing the third pole core 56. The surface of the second pole core 55; the middle magnetic portion 52 may be formed by superimposing two or three middle permanent magnets in a continuous ring structure along the vibration direction X, and between two adjacent middle permanent magnets A pole core may also be sandwiched; the middle magnetic part 52 may also be composed of a plurality of middle permanent magnets arranged around the inner magnetic part 51, and two adjacent middle permanent magnets are arranged at intervals. Wherein, at least two middle permanent magnets adjacent to the leakage passage 53A are arranged at intervals to form the air passage 52A.

In this embodiment, the outer magnetic portion 53 is composed of a plurality of outer permanent magnets arranged around the middle magnetic portion 52, and two adjacent outer permanent magnets are arranged at intervals. Wherein, the two outer permanent magnets adjacent to the basin frame leakage hole 1A are spaced apart to form the leakage passage 53A. It can be understood that in other embodiments, the outer magnetic portion 53 may also be an outer permanent magnet in a ring structure. Accordingly, the outer permanent magnet needs to be provided at the position corresponding to the leak hole of the basin frame. A leakage channel connecting the outer magnetic gap and the basin frame leakage hole.

The inner permanent magnets, the middle permanent magnets, and the outer permanent magnets mentioned above usually adopt magnetic steel. It is understandable that the inner permanent magnet, the middle permanent magnet, and the outer permanent magnet can also be natural magnets.

Compared with the related art, the speaker box of the present invention is provided by setting the upper diaphragm 31 and the lower diaphragm 33 to have opposite vibration directions and are driven by the upper voice coil 34 and the lower voice coil 35, respectively, and The sound device 200 is arranged to be suspended in the front cavity 100B, so that 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 103 , So that the effective vibration area of the speaker box is greatly increased to increase the sensitivity of the speaker box; at the same time, through the structural design of the magnetic circuit system 5, the magnetic circuit system 5 has the inner magnetic gap 5A and the outer magnetic gap 5A. The gap 5B and the air passage 52A connecting 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 receiving space 200A It can communicate with the rear cavity 100C through the basin frame leakage hole 1A and the monomer leakage hole 102. In addition, by inserting the upper voice coil 34 and the lower voice coil 35 into the inner magnetic gap 5A and the outer magnetic gap 5B of the magnetic circuit system 5, respectively, the upper diaphragm 31 and the The diaphragm 33 described below shares the same magnetic circuit system, thereby improving the utilization rate of the magnetic circuit.

The above are only the embodiments of the present invention. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these all belong to the present invention. The scope of protection.

Claims

A speaker box includes a box body with a containing cavity and a sound generating device, wherein the box body is provided with a partition that separates the containing cavity into a front cavity and a rear cavity, and the box body is penetrated There is a sound hole communicating with the front cavity, a monomer leakage hole communicating with the rear cavity is penetrated on the partition board, the sound emitting device is suspended in the front cavity, and the sound emitting device includes A basin frame abutting with the partition, a vibration system fixed on the basin frame, and a magnetic circuit system that drives the vibration system to vibrate and produce sound. A basin frame leakage hole, the vibration system includes an upper diaphragm and a lower diaphragm which are respectively fixed on opposite sides of the basin frame and have opposite vibration directions, an upper voice coil that drives the upper diaphragm to vibrate, and drives the The lower voice coil that vibrates and produces sound by the lower diaphragm, the upper diaphragm, the lower diaphragm and the basin frame enclose to form a receiving space for accommodating the magnetic circuit system, and the receiving space is connected to the basin frame leakage hole The magnetic circuit system includes an inner magnetic part, a middle magnetic part arranged around the inner magnetic part and forming an inner magnetic gap with the inner magnetic part, and a middle magnetic part arranged around the middle magnetic part and connected to the middle magnetic part. The outer magnetic part forming an outer magnetic gap between the parts, the first pole core fixed on the side of the inner magnetic part facing the upper diaphragm, the middle magnetic part and the outer magnetic part facing The second pole core on one side of the upper diaphragm and the third pole core fixed on the side of the inner magnetic part and the middle magnetic part facing the lower diaphragm, and the middle magnetic part has a connecting seat The air passage between the outer magnetic gap and the inner magnetic gap, the second pole core is fixed to the basin frame, the upper voice coil is inserted into the inner magnetic gap, and the lower voice coil is inserted into the outer magnetic gap. Within the gap.
The speaker box according to claim 1, wherein the basin frame leakage hole is located at a position corresponding to the basin frame and the magnetic circuit system, and the external magnetic part has a connection between the external magnetic gap and the magnetic circuit system. The leakage channel of the leakage hole of the basin frame is described.
The loudspeaker box according to claim 2, wherein the leakage hole of the basin frame, the air passage and the leakage passage are located on the same straight line.
The speaker box according to claim 2 or 3, wherein the outer magnetic part is composed of a plurality of outer permanent magnets arranged around the middle magnetic part, and two adjacent outer permanent magnets are arranged at intervals, wherein , The two outer permanent magnets adjacent to the leakage hole of the basin frame are arranged at intervals to form the leakage channel.
The speaker box according to claim 1 or 2 or 3, wherein the middle magnetic part is in a continuous ring structure, and the middle magnetic part comprises a first surface and a second surface that are arranged opposite to each other in the direction of vibration, The air passage is formed recessed from the first surface to the second surface.
The speaker box according to claim 1, wherein the vibration system further comprises a skeleton, the skeleton comprising a first connection part connected to the lower diaphragm and a second connection part connected to the lower voice coil Part and a third connecting part connecting the first connecting part and the second connecting part.
The loudspeaker box according to claim 6, wherein the first connecting portion and the second connecting portion both have a ring structure.
The speaker box according to claim 6, wherein the vibration system further comprises an upper dome and a lower dome arranged in the containing space, and the upper dome is respectively arranged on opposite sides of the vibration direction. It is connected with the upper diaphragm and the upper voice coil, and the opposite sides of the lower dome in the vibration direction are respectively connected with the first connecting portion and the lower diaphragm.
The speaker box according to claim 1, wherein the magnetic circuit system further comprises a fourth pole core fixed on the side of the outer magnetic part facing the lower diaphragm, and the fourth pole core is fixed于The basin frame.
The speaker box according to claim 1, wherein the sound generating device further comprises an upper end cover and a lower end cover, the upper diaphragm is sandwiched between the basin frame and the upper end cover, and the upper end cover There is a first sound hole for the upper diaphragm to emit sound, the lower diaphragm is sandwiched between the basin frame and the lower end cover, and the lower end cover has a direction for the lower diaphragm The second sound hole for external sound.