CN118678268A

CN118678268A - Sound producing device and electronic equipment

Info

Publication number: CN118678268A
Application number: CN202411162307.1A
Authority: CN
Inventors: 姜龙; 于龙欣; 朱本超; 郭翔
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2024-08-23
Filing date: 2024-08-23
Publication date: 2024-09-20
Anticipated expiration: 2044-08-23
Also published as: CN118678268B

Abstract

The present invention discloses a sound-generating device and an electronic device, and relates to the technical field of electroacoustic transducer. The sound-generating device includes a magnetic circuit system and a vibration system. The magnetic circuit system includes a magnetic yoke, a central magnetic part and a side magnetic part. The side magnetic part is located outside the central magnetic part and forms a magnetic gap. The central magnetic part includes a first magnetic group, a second magnetic group and a third magnetic group arranged in layers. The vibration system includes a diaphragm and a voice coil, and the voice coil is arranged corresponding to the magnetic gap. The central magnetic part also includes a fourth magnetic group arranged between the first magnetic group and the magnetic yoke. The first magnetic group and the third magnetic group are magnetized along the vibration direction of the vibration system, and the second magnetic group and the fourth magnetic group are magnetized along the vibration direction perpendicular to the vibration system, so that the central magnetic part forms a Halbach magnetic circuit. The sound-generating device of the present invention increases the BL value by optimizing the central magnetic part of the magnetic circuit system, effectively improves the flatness of the BL curve, significantly improves the FR frequency response curve, and effectively reduces the harmonic distortion THD, thereby improving the sound quality and performance of the whole machine.

Description

Sound producing device and electronic equipment

Technical Field

The present invention relates to electroacoustic transduction, and more particularly, to a sound generating device and an electronic device using the sound generating device.

Background

In recent years, portable electronic devices (e.g., mobile phones, headphones, computers) have been put into daily life. Along with the rapid development of technology, the sound quality requirements of people on electronic equipment are also higher, and the full-frequency and miniature speaker becomes the mainstream requirements.

At present, box space in electronic equipment is smaller and smaller, and BL value of sound generating mechanism is limited by space size, so that the quantity of magnetic lines of force passing through the voice coil is small, and the magnetic field force received by the voice coil is small, so that the sensitivity of the sound generating mechanism is low, and the overall acoustic performance and sound effect are poor.

Disclosure of Invention

The main purpose of the invention is to provide a sound generating device and electronic equipment, aiming at providing a sound generating device for effectively improving BL value, the sound generating device is characterized in that by optimizing the central magnetic part of a magnetic circuit system, therefore, the BL value is increased, the flatness of the BL curve is effectively improved, the FR frequency response curve is obviously improved, the harmonic distortion THD is effectively reduced, and the tone quality and performance of the whole machine are better improved.

To achieve the above object, the present invention provides a sound emitting device including:

The magnetic circuit system comprises a magnetic yoke, a central magnetic part and a side magnetic part, wherein the central magnetic part and the side magnetic part are arranged on the magnetic yoke, the side magnetic part is positioned on the outer side of the central magnetic part and is spaced from the central magnetic part to form a magnetic gap, and the central magnetic part comprises a first magnetic group, a second magnetic group and a third magnetic group which are arranged in a stacked mode;

the vibration system comprises a vibrating diaphragm and a voice coil connected with the vibrating diaphragm, and the voice coil is correspondingly arranged with the magnetic gap;

The center magnetic part further comprises a fourth magnetic group arranged between the first magnetic group and the magnetic conduction yoke, the first magnetic group and the third magnetic group are magnetized along the vibration direction of the vibration system, and the second magnetic group and the fourth magnetic group are magnetized along the vibration direction perpendicular to the vibration system, so that the center magnetic part forms a halbach magnetic circuit.

In an embodiment, the magnetizing direction of the first magnetic group is opposite to the magnetizing direction of the third magnetic group;

And/or the magnetizing direction of the second magnetic group is opposite to the magnetizing direction of the fourth magnetic group;

And/or the magnetizing direction of the second magnetic group is along the peripheral edge of the second magnetic group to the central direction of the second magnetic group, and the magnetizing direction of the fourth magnetic group is along the central direction of the fourth magnetic group to the peripheral edge direction of the fourth magnetic group; or, the second magnetic group and the fourth magnetic group each have a first axis and a second axis perpendicular to the vibration direction of the vibration system, the first axis and the second axis are perpendicular to each other, the magnetization direction of the second magnetic group is along the first axis and/or the second axis, and the magnetization direction of the fourth magnetic group is along the second axis and/or the first axis;

the magnetic pole of the inner side of the second magnetic group close to the center is the same as the magnetic pole of the first magnetic group close to one side of the fourth magnetic group, and the magnetic pole of the inner side of the second magnetic group close to the center is opposite to the magnetic pole of the inner side of the fourth magnetic group close to the center.

In one embodiment, the second magnetic group comprises a second magnet with an integral plate-shaped structure, and a through hole is formed in the center of the second magnet with the plate-shaped structure;

and/or the fourth magnetic group comprises a fourth magnet with an integral plate-shaped structure, and a through hole is formed in the center of the fourth magnet with the plate-shaped structure.

In one embodiment, the first magnet assembly includes a first magnet of unitary plate-like construction;

Or, the first magnetic group comprises a plurality of first magnets, and the plurality of first magnets are adjacently arranged and are positioned between the second magnetic group and the fourth magnetic group; the first magnets magnetize along the vibration direction of the vibration system, and the magnetizing directions of the first magnets are the same.

In one embodiment, the voice coil is rectangular and annular, and has long sides and short sides connected end to end;

The second magnetic group comprises two second magnets, the two second magnets are adjacent and arranged in parallel along the direction of the long side, the two second magnets are magnetized along the direction of the long side, and the magnetizing directions of the two second magnets are opposite;

or the second magnetic group comprises two second magnets, the two second magnets are adjacent and arranged in parallel along the direction of the short side, the two second magnets magnetize along the direction of the short side, and the magnetizing directions of the two second magnets are opposite;

Or, the second magnetic group comprises four second magnets, two second magnets are adjacent and arranged in parallel along the direction of the short side, the other two second magnets are arranged at two ends of the two second magnets along the direction of the long side, the four second magnets are magnetized along the direction of the short side and the direction of the long side respectively, the magnetizing directions of the two second magnets arranged along the direction of the short side are opposite, and the magnetizing directions of the other two second magnets arranged along the direction of the long side are opposite;

Or, the second magnet group is divided along two diagonal lines to form four second magnets, two second magnets are arranged in parallel along the direction of the short side, the other two second magnets are arranged in parallel along the direction of the long side, the four second magnets are magnetized along the direction of the short side and the direction of the long side respectively, the magnetizing directions of the two second magnets arranged along the direction of the short side are opposite, and the magnetizing directions of the other two second magnets arranged along the direction of the long side are opposite.

In one embodiment, the third magnetic group includes a third magnet of unitary plate-like structure;

Or, the third magnetic group comprises a plurality of third magnets, and the plurality of third magnets are adjacently arranged and are positioned at one side of the second magnetic group, which is opposite to the first magnetic group; the third magnets magnetize along the vibration direction of the vibration system, and the magnetizing directions of the third magnets are the same.

The fourth magnetic group comprises two fourth magnets, the two fourth magnets are adjacent and arranged in parallel along the direction of the long side, the two fourth magnets magnetize along the direction of the long side, and the magnetizing directions of the two fourth magnets are opposite;

or the fourth magnetic group comprises two fourth magnets, the two fourth magnets are adjacent and arranged in parallel along the direction of the short side, the two fourth magnets magnetize along the direction of the short side, and the magnetizing directions of the two fourth magnets are opposite;

Or, the fourth magnetic group comprises four fourth magnets, two fourth magnets are adjacent and arranged in parallel along the direction of the short side, the other two fourth magnets are arranged at two ends of the two fourth magnets along the direction of the long side, the four fourth magnets are magnetized along the direction of the short side and the direction of the long side respectively, the magnetizing directions of the two fourth magnets arranged along the direction of the short side are opposite, and the magnetizing directions of the other two fourth magnets arranged along the direction of the long side are opposite;

or, the fourth magnet group is divided along two diagonal lines to form four fourth magnets, two fourth magnets are arranged in parallel along the direction of the short side, the other two fourth magnets are arranged in parallel along the direction of the long side, the four fourth magnets are magnetized along the direction of the short side and the direction of the long side respectively, the magnetizing directions of the two fourth magnets arranged along the direction of the short side are opposite, and the magnetizing directions of the other two fourth magnets arranged along the direction of the long side are opposite.

In an embodiment, at least part of the projection of the second magnetic group along the direction perpendicular to the vibration direction of the vibration system coincides with the projection of the voice coil along the direction perpendicular to the vibration direction of the vibration system.

In one embodiment, at least part of the side of the third magnetic group facing away from the second magnetic group protrudes towards the side facing away from the second magnetic group to form a protrusion.

In one embodiment, the third magnetic group comprises a central part and a rim part, the rim part surrounds the periphery of the central part, and one side of the central part, which is opposite to the second magnetic group, protrudes out of one side of the rim part, which is opposite to the second magnetic group, and forms the protruding part;

The edge part forms a closed integral annular structure; or, the edge part comprises a plurality of adjacent edge parts which are connected end to form a closed annular structure; or, the edge part comprises a plurality of adjacent edge parts which are spaced to form an annular structure with a gap; or, the edge part and the central part are of an integrated structure.

In an embodiment, a top surface of the diaphragm facing away from the second magnetic group is not higher than a top surface of the protrusion facing away from the second magnetic group;

And/or the vibrating diaphragm is annular, and the inner periphery of the vibrating diaphragm is fixed on the end surface of the edge part, which is opposite to the second magnetic group.

In an embodiment, the edge of the third magnetic group is provided with an avoidance structure, and the avoidance structure is at least one of an inclined plane, a round angle, a chamfer angle and a step structure;

The avoidance structure is arranged around the periphery of one side of the third magnetic group, which is opposite to the second magnetic group; or, the avoiding structures comprise a plurality of structures, and the plurality of structures are arranged at intervals and surround the periphery of one side of the third magnetic group, which is opposite to the second magnetic group; or, the avoidance structures comprise a plurality of adjacent avoidance structures which are connected end to form a closed annular structure and encircle the periphery of one side, opposite to the second magnetic group, of the third magnetic group;

And/or an included angle formed by the avoidance structure and the surface of the third magnetic group, which is opposite to one side of the second magnetic group, is larger than 90 degrees and smaller than 180 degrees.

In one embodiment, the side magnetic part comprises a side magnet and a side magnetic conduction plate which are arranged in a stacked manner, and the side magnet is connected with the magnetic conduction yoke;

The first magnetic group, the third magnetic group and the side magnets are magnetized along the vibration direction of the vibration system, the magnetizing direction of the first magnetic group is opposite to the magnetizing direction of the side magnets of the side magnetic part, and the magnetizing direction of the third magnetic group is identical to the magnetizing direction of the side magnets of the side magnetic part.

In an embodiment, the sound generating device further comprises a housing, one end of the housing is connected with the side magnetic conductive plate, and the other end of the housing is connected with the periphery of the vibrating diaphragm.

In one embodiment, the side magnetic conduction plate and the shell are of an integrated structure;

And/or the vibrating diaphragm is annular, the inner periphery of the vibrating diaphragm is fixed on the magnetic circuit system, one end of the voice coil is connected with the vibrating diaphragm, and the other end of the voice coil is suspended in the magnetic gap.

In one embodiment, the vibration system further comprises a frame, and the voice coil is connected with the vibrating diaphragm through the frame.

In one embodiment, the skeleton comprises a main body part and a connecting part connected to the periphery of the main body part, and the main body part is arranged between the vibrating diaphragm and the voice coil;

the vibration system further comprises a centering support piece, wherein the centering support piece comprises an outer fixing portion, an inner fixing portion and an elastic wall portion, the elastic wall portion is connected with the outer fixing portion and the inner fixing portion, the outer fixing portion is connected with the shell and/or the side magnetic portion, and the inner fixing portion is connected with the connecting portion.

In one embodiment, the vibrating diaphragm includes an inner ring portion, a first ring-shaped portion surrounding the inner ring portion, a straight portion surrounding the first ring-shaped portion, a second ring-shaped portion surrounding the straight portion, and a fixing portion connected to the outer side of the second ring-shaped portion, wherein the fixing portion is connected to the housing, the straight portion is directly or indirectly connected to the voice coil, and the inner ring portion is connected to the third magnetic group;

Wherein the inner ring part is in a straight plate shape and is attached to the third magnetic group; or, an inner ring hole is formed in the inner ring part, and at least part of the third magnetic group is convexly arranged in the inner ring hole.

In an embodiment, the inner ring portion, the first folding ring, the straight portion, the second folding ring and the fixing portion are integrally formed;

And/or the first folding ring is raised towards the direction away from the magnetic conducting yoke, and the second folding ring is raised towards the direction close to the magnetic conducting yoke;

And/or, the vibrating diaphragm further comprises a reinforcing part, and the reinforcing part is arranged on the straight part;

And/or, the fixing part is far away from one end of the second folding ring and is bent towards the shell to form a bending part, and the bending part is connected to the outer wall of the shell.

The invention also proposes an electronic device, the electronic equipment comprises the sounding device.

According to the sound production device, the magnetic circuit system is arranged to be the magnetic yoke, the central magnetic part and the side magnetic part are arranged on the magnetic yoke, the side magnetic part is arranged on the outer side of the central magnetic part and is spaced from the central magnetic part to form a magnetic gap, and the voice coil of the vibration system is arranged corresponding to the magnetic gap, so that current is introduced into the voice coil, and the voice coil vibrates in a magnetic field formed by the magnetic circuit system and drives the vibrating diaphragm to vibrate and produce sound; meanwhile, the center magnetic part is arranged to be laminated to be arranged on the fourth magnetic group, the first magnetic group, the second magnetic group and the third magnetic group of the magnetic guide yoke, so that the first magnetic group and the third magnetic group are magnetized along the vibration direction of the vibration system, the second magnetic group and the fourth magnetic group are magnetized along the vibration direction perpendicular to the vibration system, namely, the magnetization direction of the second magnetic group is perpendicular to the magnetization direction of the first magnetic group and the magnetization direction of the third magnetic group, so that the center magnetic part forms a halbach magnetic circuit, the halbach magnetic circuit formed by the center magnetic part is utilized, the magnetic field intensity is effectively improved, the density of magnetic flux of a magnetic gap is increased, the number of magnetic force lines passing through a voice coil is increased, the magnetic field force received by the voice coil is increased, the BL value is effectively improved, the sensitivity of the sounding device is improved, the flatness of a BL curve is effectively improved, the FR frequency response curve is obviously improved, the harmonic distortion THD is effectively reduced, and the sound effect and performance of the whole machine are better improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an embodiment of a sound generating apparatus according to the present invention;

FIG. 2 is a schematic diagram illustrating a structure of a sound generating apparatus according to another embodiment of the present invention;

FIG. 3 is an exploded view of an embodiment of a sound emitting device according to the present invention;

FIG. 4 is a schematic cross-sectional view of an embodiment of a sound generating apparatus according to the present invention;

FIG. 5 is a schematic view of a portion of an embodiment of a sound generating apparatus according to the present invention;

FIG. 6 is an exploded view of one embodiment of a central magnetic portion provided by the present invention;

FIG. 7 is a schematic top view of a fourth magnetic assembly according to an embodiment of the present invention;

FIG. 8 is a schematic top view of an embodiment of a second magnetic assembly or a fourth magnetic assembly and a voice coil according to the present invention;

FIG. 9 is a schematic top view of another embodiment of the second magnetic assembly or the fourth magnetic assembly and the voice coil according to the present invention;

FIG. 10 is a schematic top view of an embodiment of a second magnetic assembly or a fourth magnetic assembly according to the present invention;

FIG. 11 is a schematic top view of another embodiment of a second magnetic assembly or a fourth magnetic assembly according to the present invention;

FIG. 12 is a graph comparing BL curves of the sound generating device provided by the invention and the prior art;

Fig. 13 is a graph comparing FR curves of the sound generating apparatus provided by the present invention with those of the prior art.

Reference numerals illustrate:

100. A sound producing device; 1. a housing; 2. a magnetic circuit system; 21. a magnetic yoke; 22. a central magnetic section; 221. a first magnetic group; 2211. a first magnet; 222. a second magnetic group; 2221. a second magnet; 223. a third magnetic group; 2231. a third magnet; 2232. a center portion; 2233. an edge portion; 2234. a protruding portion; 2235. an avoidance structure; 224. a fourth magnetic group; 2241. a fourth magnet; 23. a side magnetic part; 231. a side magnet; 232. a side magnetic conductive plate; 24. a magnetic gap; 3. a vibration system; 31. a vibrating diaphragm; 311. an inner ring portion; 312. an inner annular hole; 313. a first collar; 314. a straight portion; 315. a second collar; 316. a fixing part; 317. a bending part; 318. a reinforcing part; 32. a voice coil; 321. a long side; 322. short sides; 33. a skeleton; 331. a main body portion; 332. a connection part; 34. centering support pieces; 341. an outer fixing part; 342. an inner fixing part; 343. and a spring wall part.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Meanwhile, the meaning of "and/or" and/or "appearing throughout the text is to include three schemes, taking" a and/or B "as an example, including a scheme, or B scheme, or a scheme that a and B satisfy simultaneously.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Based on the above concepts and problems, the present invention proposes a sound generating apparatus 100. It is understood that the sound generating apparatus 100 may be applied to an electronic device, and the electronic device may be a smart watch, a mobile phone, a sound device, a computer, an earphone, a television, or the like, which is not limited herein.

Referring to fig. 1 to 11 in combination, in the embodiment of the invention, the sound generating device 100 includes a magnetic circuit system 2 and a vibration system 3, the magnetic circuit system 2 includes a magnetic yoke 21, a central magnetic portion 22 and a side magnetic portion 23 disposed on the magnetic yoke 21, the side magnetic portion 23 is located outside the central magnetic portion 22 and is spaced from the central magnetic portion 22 to form a magnetic gap 24, the central magnetic portion 22 includes a first magnetic group 221, a second magnetic group 222 and a third magnetic group 223 which are stacked, the vibration system 3 includes a diaphragm 31 and a voice coil 32 connected to the diaphragm 31, and the voice coil 32 is disposed corresponding to the magnetic gap 24; the central magnetic part 22 further includes a fourth magnetic group 224 disposed between the first magnetic group 221 and the magnetic yoke 21, where the first magnetic group 221 and the third magnetic group 223 are magnetized along the vibration direction of the vibration system 3, and the second magnetic group 222 and the fourth magnetic group 224 are magnetized along the vibration direction perpendicular to the vibration system 3, so that the central magnetic part 22 forms a halbach magnetic circuit.

In this embodiment, the sound generating device 100 may be a sound generating unit of a speaker, and the speaker may be a micro speaker. Of course, the sound generating device 100 may also be a speaker module, i.e. a sound generating module structure, which is not limited herein.

The magnetic circuit 2 and the vibration system 3 of the sound generating device 100 are disposed opposite to each other. Of course, in other embodiments, in order to further reduce the Z-dimension of the electronic device, the Z-height of the sound generating device 100 is utilized to increase the Z-height of the magnetic circuit 2 of the sound generating device 100, that is, the center of the vibration system 3 is provided with a through structure for the magnetic circuit 2 to protrude, at this moment, at least part of the magnetic circuit 2 protrudes from the through structure in the center of the vibration system 3, and the center of the vibration system 3 is fixedly connected with the magnetic circuit 2, which is not limited herein.

Alternatively, the magnetic circuit 2 may be provided in a square shape. For example, the magnetic circuit system 2 may include a center magnetic portion 22 and side magnetic portions 23 each having a square structure. The vibration system 3 is optionally arranged in a square. It should be understood that the periphery of the diaphragm 31 of the vibration system 3 may be connected to the magnetic circuit system 2, or the magnetic circuit system 2 and the vibration system 3 may be assembled on a housing or a module housing, which is not limited herein.

In order to better assemble the magnetic circuit system 2 and the vibration system 3 of the sound generating device 100. In an embodiment, as shown in fig. 1 to 5, the sound generating device 100 further includes a housing 1, the magnetic circuit system 2 is connected to one end of the housing 1, and the vibration system 3 is connected to the other end of the housing 1, that is, the periphery of the diaphragm 31 of the vibration system 3 is connected to the other end of the housing 1.

In the present embodiment, the housing 1 is used for mounting, fixing and supporting the components of the magnetic circuit system 2 and the vibration system 3, that is, the housing 1 provides a mounting base for the components of the magnetic circuit system 2 and the vibration system 3. It will be appreciated that the housing 1 may be a unitary structure or may be formed by a plurality of separate structures, which are not limited herein. The housing 1 in this embodiment may be a square frame or a frame structure, that is, the housing 1 has a cavity with two open ends, and the magnetic circuit system 2 and the vibration system 3 are respectively connected to two sides of the housing 1, so that the vibration cavities are formed by enclosing the magnetic circuit system 2, the housing 1 and the vibration film 31 of the vibration system 3.

It is understood that the sound generating apparatus 100 is applied to an electronic device, that is, the sound generating apparatus 100 may be mounted to the electronic device through the housing 1. It should be noted that, the housing 1 of the sound generating apparatus 100 may be a housing or a box structure independent of the electronic device, and at this time, the magnetic circuit system 2, the vibration system 3, and other components of the sound generating apparatus 100 are integrated into a whole structure by using the housing 1, so as to facilitate disassembly and assembly. Of course, the housing 1 of the sound generating apparatus 100 may be integrally formed with the housing or the case of the electronic device, so as to effectively improve the structural strength and sealing performance.

In the present embodiment, the housing 1 is used to house and fix the structures such as the vibration system 3 and the magnetic circuit system 2, so that the sound generating apparatus 100 can be applied as a separate component to an electronic device or a sound generating module, which is not limited herein. Of course, in other embodiments, the sound generating device 100 may be a module structure, and in this case, the structures such as the vibration system 3 and the magnetic circuit system 2 of the sound generating unit are respectively mounted as a plurality of independent components on the housing 1 of the module structure, which is not limited herein.

It can be understood that by providing the magnetic circuit 2 as the magnetic yoke 21 and the center magnetic portion 22 and the side magnetic portions 23 provided to the magnetic yoke 21, the magnetic circuit 2 can be connected to the housing 1 through the peripheral edge of the magnetic yoke 21; alternatively, the magnetic circuit 2 may be connected to the housing 1 via the side magnetic portion 23, which is not limited herein. In this embodiment, the side magnetic portion 23 is located outside the central magnetic portion 22 and surrounds the central magnetic portion 22 to form the magnetic gap 24, so that the diaphragm 31 of the vibration system 3 is connected to one end of the housing 1 away from the magnetic yoke 21, and is opposite to the magnetic circuit 2, and the center of the diaphragm 31 is spaced apart from the magnetic circuit 2, or connected to the central magnetic portion 22 of the magnetic circuit 2, so that one end of the voice coil 32 is connected to the diaphragm 31, and the other end of the voice coil 32 is disposed corresponding to the magnetic gap 24.

It should be noted that, the voice coil 32 may be a flat voice coil, and is fixed on the side of the diaphragm 31 facing the magnetic circuit system 2, and is opposite to and spaced from the magnetic gap 24 of the magnetic circuit system 2, that is, the other end of the voice coil 32 is located outside the magnetic gap 24, and along the vibration direction of the vibration system 3, the other end of the voice coil 32 is opposite to the magnetic gap 24; or the voice coil 32 has a circular cylindrical shape, and at this time, one end of the voice coil 32 is connected to the diaphragm 31, and the other end of the voice coil 32 is suspended in the magnetic gap 24, which is not limited herein.

To make electrical connection of the voice coil 32 to an external circuit. In one embodiment, as shown in fig. 2 to 5, the vibration system 3 further includes a centering support 34, one end of the centering support 34 is connected to the voice coil 32 and is connected to the lead wire of the voice coil 32, and the other end of the centering support 34 is connected to the housing 1.

It will be appreciated that the two ends of the centering tabs 34 are electrically connected to the leads of the voice coil 32 and the external circuit, respectively. In this embodiment, the centering pads 34 may be disposed at the bottom of the voice coil 32, and the centering pads 34 are located at four corners of the sound emitting device 100 or in the short or long axis direction of the sound emitting device 100. Of course, the centering support 34 may also be disposed on top of the voice coil 32, and the centering support 34 is located between the voice coil 32 and the diaphragm 31, which is not limited herein.

In this embodiment, the center magnetic part 22 is set to be stacked on the fourth magnetic group 224, the first magnetic group 221, the second magnetic group 222 and the third magnetic group 223 of the magnetic yoke 21, so that the first magnetic group 221 and the third magnetic group 223 of the center magnetic part 22 are magnetized along the vibration direction of the vibration system 3, and the second magnetic group 222 and the fourth magnetic group 224 are magnetized along the vibration direction perpendicular to the vibration system 3, that is, the magnetizing directions of the second magnetic group 222 and the fourth magnetic group 224 are perpendicular to the magnetizing directions of the first magnetic group 221 and the third magnetic group 223, so that the center magnetic part 22 forms a halbach magnetic circuit with higher magnetic field strength, thereby increasing the density of the magnetic flux of the magnetic gap 24, increasing the number of magnetic lines of force passing through the voice coil 32, effectively improving the BL value, improving the sensitivity of the sounding device 100, effectively improving the flatness of the BL curve (as shown in fig. 12), obviously improving the FR frequency response curve (as shown in fig. 13), and reducing the THD effect and better sound performance of the whole machine.

Fig. 12 is a graph showing a BL curve of the sound generating apparatus 100 according to the present application compared with a BL curve of a conventional speaker, wherein the BL curve has an abscissa of an amplitude mm and an ordinate of a BL value t.m. It can be seen that the BL curve of the inventive sound emitting device 100 is more symmetrical than that of the conventional speaker, and the BL value of the inventive sound emitting device 100 is higher than that of the conventional speaker. Fig. 13 is a graph comparing FR curves of the sound emitting device 100 of the present application with FR curves of conventional speakers, the FR curves having an abscissa of Hz and an ordinate of db. It can be seen that the FR curve of the sound generating apparatus 100 of the present application is significantly higher than that of the conventional speaker at less than 1000 Hz; when the frequency is more than 1000 Hz-10000 Hz, the FR curve of the sound generating device 100 is obviously higher than that of the conventional loudspeaker.

Alternatively, the vibration direction of the vibration system 3 in the present embodiment may be selected to be a vertical direction. In the present embodiment, the center magnetic portion 22 is configured to be stacked on the fourth magnetic group 224, the first magnetic group 221, the second magnetic group 222, and the third magnetic group 223 of the magnetic yoke 21, that is, the fourth magnetic group 224, the first magnetic group 221, the second magnetic group 222, and the third magnetic group 223 are stacked on the magnetic yoke 21 in the vertical direction.

Alternatively, the first magnetic group 221 and the third magnetic group 223 of the center magnetic part 22 are magnetized in the vertical direction, and the second magnetic group 222 and the fourth magnetic group 224 are magnetized in the horizontal direction. It is understood that the magnetizing directions of the second magnetic group 222 and the fourth magnetic group 224 are perpendicular to the magnetizing directions of the first magnetic group 221 and the third magnetic group 223. It should be noted that, in fig. 4, 5, and 7 to 11, the arrow direction in the magnetic circuit system 2 is the direction from the S pole to the N pole, i.e., the magnetizing direction.

It can be understood that the central magnetic portion 22 forms a halbach magnetic array, which can generate a stronger magnetic field, and the voice coil 32 is driven by the magnetic field generated by the halbach magnetic array to drive the vibrating diaphragm 31 to vibrate and sound, so that the voice coil 32 has a stronger magnetic field, which is beneficial to improving the sensitivity of controlling the vibrating diaphragm 31 to vibrate; in addition, the halbach magnetic array allows magnetic induction lines at the voice coil 32 to be uniformly distributed, and magnetic field changes in the vibration direction of the diaphragm 31 have good linearity, so that the tone quality of audio output by the sound generating device 100 can be effectively improved, the sound raising effect is improved, and the distortion condition of the audio output by the sound generating device 100 is relieved to a certain extent. The vibration of the diaphragm 31 is specifically that the edge of the diaphragm 31 is fixed, and the surface of the diaphragm 31 vibrates reciprocally in a direction perpendicular to the surface of the diaphragm 31.

In the present embodiment, the fourth magnetic group 224, the first magnetic group 221, the second magnetic group 222 and the third magnetic group 223 of the central magnetic part 22 are stacked along the moving direction of the voice coil 32, that is, the fourth magnetic group 224 is connected to the magnetic yoke 21, the first magnetic group 221 is stacked on the side of the fourth magnetic group 224 facing away from the magnetic yoke 21, the second magnetic group 222 is stacked on the side of the first magnetic group 221 facing away from the fourth magnetic group 224, and the third magnetic group 223 is stacked on the side of the second magnetic group 222 facing away from the first magnetic group 221.

Optionally, the fourth magnetic group 224, the first magnetic group 221, the second magnetic group 222, and the third magnetic group 223 of the central magnetic portion 22 have a square plate structure, which is not limited herein.

In this embodiment, as shown in fig. 3 to 6, by magnetizing the first magnetic group 221 and the third magnetic group 223 of the central magnetic portion 22 in the vertical direction, and magnetizing the second magnetic group 222 and the fourth magnetic group 224 in the horizontal direction, that is, the magnetizing directions of the second magnetic group 222 and the fourth magnetic group 224 are perpendicular to the magnetizing directions of the first magnetic group 221 and the third magnetic group 223, the magnetic field with higher magnetic field strength is formed by using the fourth magnetic group 224, the first magnetic group 221, the second magnetic group 222 and the third magnetic group 223 of the central magnetic portion 22 to form the halbach magnetic array, so that the density of the magnetic flux of the magnetic gap 24 is increased, the number of magnetic lines passing through the voice coil 32 is increased, the magnetic field force applied to the voice coil 32 is increased, the BL value is effectively increased, the sensitivity of the sounding device 100 is improved, and the sound effect and performance of the whole sound device are better improved.

It will be appreciated that the first magnetic group 221 and the third magnetic group 223 are both magnetized in the vibration direction of the vibration system 3, i.e., are both magnetized in the movement direction of the voice coil 32, and the second magnetic group 222 and the fourth magnetic group 224 are both magnetized in the vibration direction perpendicular to the vibration system 3, i.e., are both magnetized in the movement direction perpendicular to the voice coil 32. Optionally, the first magnetic group 221 and the third magnetic group 223 are magnetized along the vertical direction, and the second magnetic group 222 and the fourth magnetic group 224 are magnetized along the horizontal direction, so that the magnetizing directions of the second magnetic group 222 and the fourth magnetic group 224 are perpendicular to the magnetizing directions of the first magnetic group 221 and the third magnetic group 223, so as to effectively overlap and form a magnetic field with higher magnetic field strength.

In one embodiment, the magnetizing direction of the first magnetic group 221 is opposite to the magnetizing direction of the third magnetic group 223. In the present embodiment, as shown in fig. 4 and 5, the vibration direction of the vibration system 3 may be selected as a vertical direction, and the vibration direction perpendicular to the vibration system 3 may be selected as a horizontal direction. The first magnetic group 221 and the third magnetic group 223 are magnetized in the vertical direction.

It will be appreciated that, as shown in fig. 4 and 5, when the first magnetic group 221 is magnetized from bottom to top, the third magnetic group 223 is magnetized from top to bottom, that is, when the N pole of the first magnetic group 221 is up and the S pole is down, the N pole of the third magnetic group 223 is down and the S pole is up; or when the first magnetic group 221 is magnetized from top to bottom, the third magnetic group 223 is magnetized from bottom to top, that is, when the N pole and S pole of the first magnetic group 221 are on the bottom and the S pole are on the top, the N pole and S pole of the third magnetic group 223 are on the bottom, which is not limited herein.

It can be appreciated that the magnetizing direction of the first magnetic group 221 is opposite to the magnetizing direction of the third magnetic group 223, so that the magnetic induction lines of the first magnetic group 221 and the third magnetic group 223 of the central magnetic portion 22 are gathered in the second magnetic group 222, and the magnetic field with stronger magnetic field strength generated by the central magnetic portion 22 passes through the magnetic gap 24, so as to increase the density of the magnetic flux of the magnetic gap 24, increase the number of magnetic lines of force passing through the voice coil 32, increase the magnetic field force applied to the voice coil 32, and effectively increase the BL value.

In one embodiment, the magnetizing direction of the second magnetic group 222 is opposite to the magnetizing direction of the fourth magnetic group 224. In the present embodiment, as shown in fig. 4 and 5, the vibration direction of the vibration system 3 may be selected as a vertical direction, and the vibration direction perpendicular to the vibration system 3 may be selected as a horizontal direction. The second magnetic group 222 and the fourth magnetic group 224 are both magnetized in the horizontal direction.

It can be appreciated that, when the magnetizing direction of the second magnetic group 222 is from the center of the second magnetic group 222 to the voice coil 32, the magnetizing direction of the fourth magnetic group 224 is from the magnetic gap 24 to the center of the fourth magnetic group 224, that is, the S pole of the second magnetic group 222 is located at the center of the second magnetic group 222, the N pole faces the voice coil 32, the S pole of the fourth magnetic group 224 faces the magnetic gap 24, and the N pole is located at the center of the fourth magnetic group 224; alternatively, when the magnetizing direction of the second magnetic group 222 is from the voice coil 32 to the center of the second magnetic group 222, the magnetizing direction of the fourth magnetic group 224 may be from the center of the fourth magnetic group 224 to the magnetic gap 24, that is, the S pole of the second magnetic group 222 faces the voice coil 32, the N pole is located at the center of the second magnetic group 222, the S pole of the fourth magnetic group 224 is located at the center of the fourth magnetic group 224, and the N pole faces the magnetic gap 24, which is not limited herein.

Alternatively, as shown in fig. 4, 5 and 7, the magnetizing direction of the second magnetic group 222 is along the periphery of the second magnetic group 222 toward the center direction of the second magnetic group 222, and the magnetizing direction of the fourth magnetic group 224 is along the center of the fourth magnetic group 224 toward the periphery direction of the fourth magnetic group 224; or, the magnetizing direction of the second magnetic group 222 is along the center of the second magnetic group 222 to the peripheral direction of the second magnetic group 222, and the magnetizing direction of the fourth magnetic group 224 is along the peripheral direction of the fourth magnetic group 224 to the center direction of the fourth magnetic group 224.

In an embodiment, the second magnetic group 222 and the fourth magnetic group 224 each have a first axis and a second axis perpendicular to the vibration direction of the vibration system 3, and the first axis and the second axis are perpendicular to each other, the magnetization direction of the second magnetic group 222 is along the first axis and/or the second axis, and the magnetization direction of the fourth magnetic group 224 is along the second axis and/or the first axis.

In the present embodiment, as shown in fig. 5, 7 to 9, and 11, the second magnetic group 222 and the fourth magnetic group 224 are magnetized in the horizontal direction. The second magnetic group 222 is magnetized along the horizontal direction, and when the magnetizing direction of the second magnetic group 222 is the direction from the magnetic gap 24 to the center of the second magnetic group 222, the magnetizing direction of the fourth magnetic group 224 is the direction from the center of the fourth magnetic group 224 to the magnetic gap 24, that is, the S pole of the second magnetic group 222 faces the magnetic gap 24, the N pole is located at the center of the second magnetic group 222, the S pole of the fourth magnetic group 224 is located at the center of the fourth magnetic group 224, and the N pole faces the magnetic gap 24; or the magnetizing direction of the second magnetic group 222 may be from the center of the second magnetic group 222 to the direction of the magnetic gap 24, and the magnetizing direction of the fourth magnetic group 224 may be from the magnetic gap 24 to the center of the fourth magnetic group 224, that is, the S pole of the second magnetic group 222 is located at the center of the second magnetic group 222, the N pole faces the magnetic gap 24, the S pole of the fourth magnetic group 224 faces the magnetic gap 24, and the N pole is located at the center of the fourth magnetic group 224; alternatively, the magnetizing directions of the second magnetic group 222 and the fourth magnetic group 224 may be along the cross or two diagonal directions, which is not limited herein.

Alternatively, as shown in fig. 4, the magnetic pole of the inner side of the second magnetic group 222 near the center thereof is the same as the magnetic pole of the first magnetic group 221 on the side near the fourth magnetic group 224, and the magnetic pole of the inner side of the second magnetic group 222 near the center thereof is opposite to the magnetic pole of the inner side of the fourth magnetic group 224 near the center thereof.

In this embodiment, when the magnetizing direction of the fourth magnetic group 224 is from the periphery of the fourth magnetic group 224 to the center of the fourth magnetic group 224, the magnetizing direction of the second magnetic group 222 is from the center of the second magnetic group 222 to the periphery of the second magnetic group 222, and the first magnetic group 221 is magnetized from bottom to top, that is, the first magnetic group 221 is magnetized upward in the vertical direction, and the third magnetic group 223 is magnetized from top to bottom, that is, the third magnetic group 223 is magnetized downward in the vertical direction. When the magnetizing direction of the fourth magnetic group 224 is from the center of the fourth magnetic group 224 to the periphery of the fourth magnetic group 224, the magnetizing direction of the second magnetic group 222 is from the periphery of the second magnetic group 222 to the center of the second magnetic group 222, and the first magnetic group 221 is magnetized from top to bottom, that is, the first magnetic group 221 is magnetized downward in the vertical direction, and the third magnetic group 223 is magnetized upward from bottom, that is, the third magnetic group 223 is magnetized upward in the vertical direction, which is not limited herein.

It should be noted that, the first magnetic group 221 and the third magnetic group 223 magnetize along the vibration direction of the vibration system 3, that is, the first magnetic group 221 and the third magnetic group 223 magnetize along the vertical direction, as shown in fig. 4, the first magnetic group 221 magnetizes from bottom to top, that is, the N pole of the first magnetic group 221 is above and the S pole is below, and the third magnetic group 223 magnetizes from top to bottom, that is, the N pole of the third magnetic group 223 is below and the S pole is above; or the first magnetic group 221 is magnetized from top to bottom, that is, the N pole of the first magnetic group 221 is lower and the S pole is upper, and the third magnetic group 223 is magnetized from bottom to top, that is, the N pole of the third magnetic group 223 is upper and the S pole is lower, which is not limited herein.

It can be understood that the first magnetic group 221 and the third magnetic group 223 are magnetized along the vibration direction of the vibration system 3, the magnetization direction of the first magnetic group 221 is opposite to the magnetization direction of the third magnetic group 223, the second magnetic group 222 and the fourth magnetic group 224 are magnetized along the vibration direction perpendicular to the vibration system 3, and the magnetization direction of the second magnetic group 222 is opposite to the magnetization direction of the fourth magnetic group 224, so that the magnetic induction lines of the fourth magnetic group 224, the first magnetic group 221, the second magnetic group 222 and the third magnetic group 223 of the central magnetic part 22 are concentrated in the second magnetic group 222, and the magnetic field with stronger magnetic field strength is generated by the central magnetic part 22 to pass through the magnetic gap 24, thereby increasing the density of the magnetic flux of the magnetic gap 24, increasing the number of magnetic lines of force passing through the voice coil 32, increasing the magnetic force applied by the voice coil 32, and effectively increasing the BL value.

According to the sound production device 100, the magnetic circuit system 2 is arranged as the magnetic guide yoke 21, the central magnetic part 22 and the side magnetic part 23 which are arranged on the magnetic guide yoke, the side magnetic part 23 is arranged on the outer side of the central magnetic part 22 and is spaced from the central magnetic part 22 to form the magnetic gap 24, and the voice coil 32 of the vibration system 3 is arranged corresponding to the magnetic gap 24, so that current is introduced into the voice coil 32, and the voice coil 32 vibrates in a magnetic field formed by the magnetic circuit system 2 and drives the vibrating diaphragm 31 to vibrate and produce sound; meanwhile, the center magnetic part 22 is set to be laminated to the fourth magnetic group 224, the first magnetic group 221, the second magnetic group 222 and the third magnetic group 223 of the magnetic yoke 21, so that the first magnetic group 221 and the third magnetic group 223 are magnetized along the vibration direction of the vibration system 3, the second magnetic group 222 and the fourth magnetic group 224 are magnetized along the vibration direction perpendicular to the vibration system 3, that is, the magnetizing direction of the second magnetic group 222 and the fourth magnetic group 224 is perpendicular to the magnetizing direction of the first magnetic group 221 and the third magnetic group 223, so that the center magnetic part 22 forms a halbach magnetic circuit, and therefore, the halbach magnetic circuit formed by the center magnetic part 22 is utilized to effectively improve the magnetic field strength, increase the density of magnetic flux of the magnetic gap 24, increase the quantity of magnetic lines passing through the voice coil 32, increase the magnetic field force received by the voice coil 32, effectively improve the BL value, improve the sensitivity of the voice coil device 100, effectively improve the flatness of the BL curve, obviously improve the FR curve, and effectively reduce the harmonic distortion, and improve the sound effect of the complete machine.

In one embodiment, the first magnetic group 221 includes a first magnet 2211 having an integral plate-like structure. It can be appreciated that the arrangement is convenient for processing the first magnet 2211, assembling and magnetizing, and effectively improving the production and assembly efficiency.

In one embodiment, the first magnetic group 221 includes a plurality of first magnets 2211, where the plurality of first magnets 2211 are disposed adjacent to each other and between the second magnetic group 222 and the fourth magnetic group 224; the plurality of first magnets 2211 magnetize along the vibration direction of the vibration system 3, and the magnetization directions of the plurality of first magnets 2211 are the same.

In the present embodiment, as shown in fig. 3, 4 and 6, by providing the first magnetic group 221 as a plurality of first magnets 2211, the plurality of first magnets 2211 are laid out between the second magnetic group 222 and the fourth magnetic group 224. Alternatively, the plurality of first magnets 2211 are magnetized in the vertical direction, and the magnetizing directions of the plurality of first magnets 2211 are the same. That is, the plurality of first magnets 2211 are magnetized along the moving direction of the voice coil 32, and the plurality of first magnets 2211 are magnetized upward or downward at the same time, which is not limited herein. Alternatively, the magnetic poles of the first magnets 2211 on the side close to the second magnetic group 222 are the same.

It is understood that the first magnetic group 221 may be a first magnet 2211 with a square plate structure, which is disposed between the second magnetic group 222 and the fourth magnetic group 224; or the first magnetic group 221 includes a plurality of first magnets 2211, where the plurality of first magnets 2211 are adjacent and arranged in parallel between the second magnetic group 222 and the fourth magnetic group 224, so that the plurality of first magnets 2211 cooperate to form a square plate structure, which is not limited herein.

In this embodiment, the voice coil 32 has a rectangular ring shape, and the voice coil 32 has a long side 321 and a short side 322 which are connected end to end. Alternatively, the plurality of first magnets 2211 are disposed adjacent and in parallel along the direction of the long side 321; or a plurality of first magnets 2211 are adjacent and arranged in parallel along the direction of the short side 322; or a part of the first magnets 2211 are adjacent and parallel along the direction of the long side 321, and another part of the first magnets 2211 are disposed at two ends of the part of the first magnets 2211 along the direction of the short side 322, and vice versa, without limitation.

In an embodiment, the second magnetic group 222 includes a second magnet 2221 with a monolithic plate structure, and a through hole is formed in the center of the second magnet 2221 with the plate structure.

In this embodiment, as shown in fig. 10, the second magnetic group 222 may be a second magnet 2221, where the second magnet 2221 is arranged in a square or rectangular plate structure. It will be appreciated that, for convenience of magnetizing, a through hole is formed in the center of the second magnet 2221.

Alternatively, the magnetic pole of the inner side of the second magnetic group 222 near the center thereof is the same as the magnetic pole of the first magnetic group 221 on the side away from the second magnetic group 222.

In one embodiment, the second magnetic group 222 includes a plurality of second magnets 2221, and the plurality of second magnets 2221 are disposed adjacent to each other and between the first magnetic group 221 and the third magnetic group 223; wherein, the plurality of second magnets 2221 are magnetized in a direction perpendicular to the vibration direction of the vibration system 3.

In the present embodiment, as shown in fig. 4 to 6, 8, 9 and 11, by providing the second magnetic group 222 as a plurality of second magnets 2221, the plurality of second magnets 2221 are laid flat between the third magnetic group 223 and the first magnetic group 221. Alternatively, the plurality of second magnets 2221 are all magnetized in the horizontal direction, that is, the plurality of second magnets 2221 are all magnetized in the direction perpendicular to the moving direction of the voice coil 32, and the plurality of second magnets 2221 are all magnetized in the circumferential direction or in the circumferential direction from the center, which is not limited herein.

It is understood that the second magnetic group 222 may be a second magnet 2221 with an overall square plate structure, and is disposed between the third magnetic group 223 and the first magnetic group 221; or the second magnetic group 222 includes a plurality of second magnets 2221, where the plurality of second magnets 2221 are arranged between the first magnetic group 221 and the third magnetic group 223 adjacently and in parallel, so that the plurality of second magnets 2221 cooperate to form a square plate structure, which is not limited herein.

In this embodiment, the voice coil 32 has a rectangular ring shape, and the voice coil 32 has a long side 321 and a short side 322 which are connected end to end. Alternatively, the plurality of second magnets 2221 are arranged adjacently and in parallel in the direction of the long side 321; or a plurality of second magnets 2221 arranged adjacent and in parallel in the direction of the short side 322; or a part of the second magnets 2221 are adjacent and arranged in parallel along the direction of the long side 321, and another part of the second magnets 2221 are arranged at both ends of the part of the second magnets 2221 along the direction of the short side 322, and vice versa, without limitation.

In one embodiment, the voice coil 32 is rectangular and annular, and the voice coil 32 has a long side 321 and a short side 322 that are connected end to end; the second magnetic group 222 includes two second magnets 2221, the two second magnets 2221 are adjacent and arranged in parallel along the direction of the long side 321, the two second magnets 2221 are magnetized along the direction of the long side 321, and the magnetizing directions of the two second magnets 2221 are opposite.

In the present embodiment, as shown in fig. 4 and 8, by arranging the second magnetic group 222 as two second magnets 2221, the two second magnets 2221 are laid flat in the direction of the long side 321 and located between the first magnetic group 221 and the third magnetic group 223.

Alternatively, the two second magnets 2221 are magnetized in the horizontal direction, and the magnetizing directions of the two second magnets 2221 are opposite. The two second magnets 2221 are magnetized by the voice coil 32 in the direction of the side edge where the two second magnets 2221 are abutted; alternatively, the two second magnets 2221 are magnetized in the direction of the voice coil 32 by the side edges where the two second magnets 2221 are abutted, which is not limited herein. In this embodiment, the two second magnets 2221 have the same magnetic poles facing the side of the magnetic gap 24.

It is understood that the second magnetic group 222 may be a second magnet 2221 with an overall square plate structure, and is disposed between the first magnetic group 221 and the third magnetic group 223; or the second magnetic group 222 includes a plurality of second magnets 2221, where the plurality of second magnets 2221 are adjacent along the direction of the long side 321 and are disposed in parallel between the first magnetic group 221 and the third magnetic group 223, so that the plurality of second magnets 2221 cooperate to form a square plate structure, which is not limited herein.

Optionally, the plurality of second magnets 2221 of the second magnetic group 222 are all magnetized along the horizontal direction, the magnetizing directions of the plurality of second magnets 2221 are all perpendicular to the length extending direction of each second magnet 2221, and the polarities of the long sides of the plurality of second magnets 2221 facing the end of the voice coil 32 are all N poles or all S poles, which is not limited herein.

In an embodiment, the voice coil 32 is in a rectangular ring shape, the voice coil 32 has a long side 321 and a short side 322 that are connected end to end, the second magnetic group 222 includes two second magnets 2221, the two second magnets 2221 are adjacent and arranged in parallel along the direction of the short side 322, the two second magnets 2221 are magnetized along the direction of the short side 322, and the magnetizing directions of the two second magnets 2221 are opposite.

In the present embodiment, as shown in fig. 4 and 9, by arranging the second magnetic group 222 as two second magnets 2221, the two second magnets 2221 are laid flat in the direction of the short side 322 and located between the first magnetic group 221 and the third magnetic group 223.

It is understood that the second magnetic group 222 may be a second magnet 2221 with an overall square plate structure, and is disposed between the first magnetic group 221 and the third magnetic group 223; or the second magnetic group 222 includes a plurality of second magnets 2221, where the plurality of second magnets 2221 are adjacent along the direction of the short side 322 and are disposed in parallel between the first magnetic group 221 and the third magnetic group 223, so that the plurality of second magnets 2221 cooperate to form a square plate-like structure, which is not limited herein.

In an embodiment, the voice coil 32 is rectangular and annular, the voice coil 32 has a long side 321 and a short side 322 that are connected end to end, the second magnetic group 222 includes four second magnets 2221, two second magnets 2221 are adjacent and arranged in parallel along the direction of the short side 322, two other second magnets 2221 are arranged at two ends of the two second magnets 2221 along the direction of the long side 321, the four second magnets 2221 are magnetized along the direction of the short side 322 and the direction of the long side 321, the magnetizing directions of the two second magnets 2221 arranged along the direction of the short side 322 are opposite, and the magnetizing directions of the two other second magnets 2221 arranged along the direction of the long side 321 are opposite.

In the present embodiment, the polarities of the ends of the four second magnets 2221 facing the voice coil 32 are all N poles or all S poles, as shown in fig. 4 and 5, the four second magnets 2221 of the second magnetic group 222 are horizontally laid and located between the first magnetic group 221 and the third magnetic group 223, and two second magnets 2221 of the four second magnets 2221 are adjacent and arranged in parallel along the direction of the short side 322, and the other two second magnets 2221 of the four second magnets 2221 are arranged at both ends of the two second magnets 2221 along the direction of the long side 321.

Optionally, the four second magnets 2221 are all magnetized in the horizontal direction, the magnetizing directions of two second magnets 2221 of the four second magnets 2221 that are disposed along the short side 322 are opposite, the magnetizing directions of other two second magnets 2221 of the four second magnets 2221 that are disposed along the long side 321 are opposite, the magnetizing directions of the four second magnets 2221 are all perpendicular to the respective length extending directions, and the polarities of the ends of the four second magnets 2221 facing the voice coil 32 are both N poles or both S poles, which is not limited herein.

In this embodiment, the second magnet 2221 of the second magnetic group 222 may have an overall square strip or plate structure; or, the second magnets 2221 each include a plurality of second magnets 2221, and the plurality of second magnets 2221 are arranged between the first magnetic group 221 and the third magnetic group 223 in parallel and adjacent along the long side 321 and the short side 322, so that the plurality of second magnets 2221 cooperate to form a square strip-shaped or plate-shaped structure, which is not limited herein.

In an embodiment, the voice coil 32 is in a rectangular ring shape, the voice coil 32 has a long side 321 and a short side 322 which are connected end to end, the second magnet group 222 is divided along two diagonal lines to form four second magnets 2221, two second magnets 2221 are arranged in parallel along the direction of the short side 322, the other two second magnets 2221 are arranged in parallel along the direction of the long side 321, the four second magnets 2221 are magnetized along the direction of the short side 322 and the direction of the long side 321 respectively, the magnetizing directions of the two second magnets 2221 arranged along the direction of the short side 322 are opposite, and the magnetizing directions of the other two second magnets 2221 arranged along the direction of the long side 321 are opposite.

In this embodiment, as shown in fig. 11, the upper and lower surfaces of the second magnetic group 222 are substantially rectangular, the second magnetic group 222 is divided along two diagonal lines to form four second magnets 2221, and the four second magnets 2221 may be formed by dividing one second magnetic group 222, or may be formed by splitting a split structure to form the second magnetic group 222. Alternatively, two second magnets 2221 are arranged in parallel along the direction of the short side 322, the other two second magnets 2221 are arranged in parallel along the direction of the long side 321, the four second magnets 2221 are magnetized along the direction of the short side 322 and the direction of the long side 321, respectively, the magnetizing directions of the two second magnets 2221 arranged along the direction of the short side 322 are opposite, and the magnetizing directions of the other two second magnets 2221 arranged along the direction of the long side 321 are opposite.

Alternatively, the polarities of the ends of the four second magnets 2221 facing the voice coil 32 are all N poles or all S poles. Four second magnets 2221 of the second magnetic group 222 are horizontally laid and positioned between the first magnetic group 221 and the third magnetic group 223. Alternatively, two second magnets 2221 are symmetrically arranged at the intersection of two diagonals of the second magnetic group 222, and the other two second magnets 2221 are symmetrically arranged at the intersection of two diagonals of the second magnetic group 222.

It is understood that the four second magnetic groups 222 are all arranged in a triangle shape, such that the top angles of the four second magnets 2221 coincide with the intersection points of two diagonal lines of the second magnetic groups 222.

Alternatively, the four second magnets 2221 are magnetized in the horizontal direction, the magnetizing directions of two second magnets 2221 are opposite, the magnetizing directions of the other two second magnets 2221 are opposite, and the magnetizing directions of the four second magnets 2221 are perpendicular to the direction of the bottom edge opposite to the intersection point of the two diagonal lines of the second magnetic group 222, and the polarities of the ends of the four second magnets 2221 facing the voice coil 32 are both N-poles or both S-poles, which is not limited herein.

In one embodiment, the third magnetic group 223 includes a third magnet 2231 having an integral plate-like structure. It can be appreciated that the arrangement is convenient for processing, assembling and magnetizing the third magnet 2231, and effectively improving the production and assembly efficiency.

In an embodiment, the third magnetic group 223 includes a plurality of third magnets 2231, where the plurality of third magnets 2231 are disposed adjacent to each other and on a side of the second magnetic group 222 facing away from the first magnetic group 221; wherein, the plurality of third magnets 2231 are magnetized along the vibration direction of the vibration system 3, and the magnetizing directions of the plurality of third magnets 2231 are the same.

In the present embodiment, as shown in fig. 4 and 6, by providing the third magnetic group 223 as a plurality of third magnets 2231, the plurality of third magnets 2231 are tiled on the side of the second magnetic group 222 facing away from the first magnetic group 221. Alternatively, the plurality of third magnets 2231 are magnetized in the vertical direction, and the magnetizing directions of the plurality of third magnets 2231 are the same. That is, the plurality of third magnets 2231 are magnetized in the direction in which the voice coil 32 moves, and the plurality of third magnets 2231 are magnetized upward or downward simultaneously, which is not limited herein. Optionally, the magnetic poles of the third magnets 2231 near the second magnetic group 222 are all the same.

It can be appreciated that the third magnetic assembly 223 may be a third magnet 2231 with an overall square plate structure, and disposed on a side of the second magnetic assembly 222 facing away from the first magnetic assembly 221; or the third magnetic set 223 includes a plurality of third magnets 2231, where the plurality of third magnets 2231 are adjacent and arranged in parallel on a side of the second magnetic set 222 opposite to the first magnetic set 221, so that the plurality of third magnets 2231 cooperate to form a square plate structure, which is not limited herein.

In this embodiment, the voice coil 32 has a rectangular ring shape, and the voice coil 32 has a long side 321 and a short side 322 which are connected end to end. Optionally, a plurality of third magnets 2231 are disposed adjacent and in parallel along the direction of the long side 321; or a plurality of third magnets 2231 are disposed adjacent and in parallel in the direction of the short sides 322; or a part of the third magnets 2231 are adjacent and parallel along the direction of the long side 321, and another part of the third magnets 2231 are disposed at both ends of the part of the third magnets 2231 along the direction of the short side 322, and vice versa, without limitation.

In one embodiment, the fourth magnetic set 224 includes a fourth magnet 2241 having a plate-like structure integrally formed therewith, and a through hole is formed in the center of the fourth magnet 2241 having the plate-like structure.

In this embodiment, as shown in fig. 10, the fourth magnetic group 224 may be selected from a fourth magnet 2241, and the fourth magnet 2241 is disposed in a square or rectangular plate structure. It will be appreciated that, for convenience of magnetizing, a through hole is formed in the center of the fourth magnet 2241.

Alternatively, the magnetic pole of the inner side of the fourth magnetic group 224 near the center thereof is opposite to the magnetic pole of the side of the first magnetic group 221 away from the second magnetic group 222.

In one embodiment, the fourth magnetic group 224 includes a plurality of fourth magnets 2241, and the plurality of fourth magnets 2241 are disposed adjacent to each other and between the first magnetic group 221 and the magnetic yoke 21; wherein the plurality of fourth magnets 2241 are magnetized in a direction perpendicular to the vibration direction of the vibration system 3.

In the present embodiment, as shown in fig. 4, 6 to 9, and 11, the fourth magnet group 224 is provided as a plurality of fourth magnets 2241, and the plurality of fourth magnets 2241 are arranged in a flat manner between the yoke 21 and the first magnet group 221. Alternatively, the plurality of fourth magnets 2241 are all magnetized in the horizontal direction, that is, the plurality of fourth magnets 2241 are all magnetized in the direction perpendicular to the movement direction of the voice coil 32, and the plurality of fourth magnets 2241 are all magnetized in the circumferential direction, or in the circumferential direction, from the center, without limitation.

It is understood that the fourth magnetic group 224 may be a fourth magnet 2241 having a square plate structure, and is disposed between the magnetic yoke 21 and the first magnetic group 221; or the fourth magnetic group 224 includes a plurality of fourth magnets 2241, where the plurality of fourth magnets 2241 are adjacently and parallelly arranged between the first magnetic group 221 and the magnetic yoke 21, so that the plurality of fourth magnets 2241 cooperate to form a square plate structure, which is not limited herein.

In this embodiment, the voice coil 32 has a rectangular ring shape, and the voice coil 32 has a long side 321 and a short side 322 which are connected end to end. Alternatively, the plurality of fourth magnets 2241 are disposed adjacently and in parallel along the direction of the long side 321; or a plurality of fourth magnets 2241 are disposed adjacent and in parallel in the direction of the short side 322; or a part of the fourth magnets 2241 are disposed adjacently and in parallel along the direction of the long side 321, and the other part of the fourth magnets 2241 are disposed at both ends of the part of the fourth magnets 2241 along the direction of the short side 322, and vice versa, without limitation.

In one embodiment, the voice coil 32 is rectangular and annular, and the voice coil 32 has a long side 321 and a short side 322 that are connected end to end; the fourth magnetic group 224 includes two fourth magnets 2241, the two fourth magnets 2241 are adjacent and arranged in parallel along the direction of the long side 321, the two fourth magnets 2241 are all magnetized along the direction of the long side 321, and the magnetizing directions of the two fourth magnets 2241 are opposite.

In the present embodiment, as shown in fig. 4 and 8, by providing the fourth magnetic group 224 as two fourth magnets 2241, the two fourth magnets 2241 are laid flat in the direction of the long side 321 and located between the first magnetic group 221 and the magnetic yoke 21.

Alternatively, the two fourth magnets 2241 are magnetized in the horizontal direction, and the magnetizing directions of the two fourth magnets 2241 are opposite. The two fourth magnets 2241 are magnetized by the magnetic gap 24 in the direction of the side edge where the two fourth magnets 2241 are abutted against each other; alternatively, the two fourth magnets 2241 are magnetized in the direction of the magnetic gap 24 by the side edges where the two fourth magnets 2241 are abutted against each other, which is not limited herein. In the present embodiment, the magnetic poles of the two fourth magnets 2241 facing the side of the magnetic gap 24 are the same.

It is understood that the fourth magnetic group 224 may be a fourth magnet 2241 with an integral square plate structure and disposed between the first magnetic group 221 and the magnetic yoke 21; or the fourth magnetic group 224 includes a plurality of fourth magnets 2241, where the plurality of fourth magnets 2241 are adjacent along the direction of the long side 321 and are disposed in parallel between the first magnetic group 221 and the magnetic yoke 21, so that the plurality of fourth magnets 2241 cooperate to form a square plate structure, which is not limited herein.

Optionally, the fourth magnets 2241 of the fourth magnetic group 224 are all magnetized along the horizontal direction, the magnetizing directions of the fourth magnets 2241 are all perpendicular to the length extending direction of each fourth magnet 2241, and the polarities of the long sides of the fourth magnets 2241 facing the end of the voice coil 32 are all N poles or S poles, which is not limited herein.

In an embodiment, the voice coil 32 is rectangular and annular, the voice coil 32 has a long side 321 and a short side 322 that are connected end to end, the fourth magnetic group 224 includes two fourth magnets 2241, the two fourth magnets 2241 are adjacent and arranged in parallel along the direction of the short side 322, the two fourth magnets 2241 are magnetized along the direction of the short side 322, and the magnetizing directions of the two fourth magnets 2241 are opposite.

In the present embodiment, as shown in fig. 4, 6 and 9, by providing the fourth magnetic group 224 as two fourth magnets 2241, the two fourth magnets 2241 are laid flat in the direction of the short side 322 and located between the first magnetic group 221 and the magnetic yoke 21.

Alternatively, the two fourth magnets 2241 are magnetized in the horizontal direction, and the magnetizing directions of the two fourth magnets 2241 are opposite. The two fourth magnets 2241 are magnetized by the magnetic gap 24 in the direction of the side edge where the two fourth magnets 2241 are abutted against each other; alternatively, the two fourth magnets 2241 are magnetized in the direction of the magnetic gap 24 by the side edges where the two fourth magnets 2241 are abutted against each other, which is not limited herein. In this embodiment, the two second magnets 2221 have the same magnetic poles facing the side of the magnetic gap 24.

It is understood that the fourth magnetic group 224 may be a fourth magnet 2241 with an integral square plate structure and disposed between the first magnetic group 221 and the magnetic yoke 21; or the fourth magnetic group 224 includes a plurality of fourth magnets 2241, where the plurality of fourth magnets 2241 are adjacent to each other along the direction of the short side 322 and are disposed in parallel between the first magnetic group 221 and the magnetic yoke 21, so that the plurality of fourth magnets 2241 cooperate to form a square plate structure, which is not limited herein.

In an embodiment, the voice coil 32 is rectangular and annular, the voice coil 32 has a long side 321 and a short side 322 that are connected end to end, the fourth magnet group 224 includes four fourth magnets 2241, two fourth magnets 2241 are adjacent and arranged in parallel along the direction of the short side 322, two other fourth magnets 2241 are arranged at two ends of the two fourth magnets 2241 along the direction of the long side 321, the four fourth magnets 2241 are magnetized along the direction of the short side 322 and the direction of the long side 321, the magnetizing directions of the two fourth magnets 2241 arranged along the direction of the short side 322 are opposite, and the magnetizing directions of the two other fourth magnets 2241 arranged along the direction of the long side 321 are opposite.

In the present embodiment, the polarities of the ends of the four fourth magnets 2241 facing the voice coil 32 are N or S, as shown in fig. 4, 6 and 7, the four fourth magnets 2241 of the fourth magnetic group 224 are horizontally laid and located between the first magnetic group 221 and the magnetic yoke 21, and two fourth magnets 2241 of the four fourth magnets 2241 are adjacent and arranged in parallel along the direction of the short side 322, and the other two fourth magnets 2241 of the four fourth magnets 2241 are arranged at both ends of the two fourth magnets 2241 along the direction of the long side 321.

Optionally, the four fourth magnets 2241 are all magnetized in the horizontal direction, the magnetizing directions of two fourth magnets 2241 of the four fourth magnets 2241 that are disposed along the short side 322 are opposite, the magnetizing directions of the other two fourth magnets 2241 of the four fourth magnets 2241 that are disposed along the long side 321 are opposite, the magnetizing directions of the four fourth magnets 2241 are all perpendicular to the respective length extending directions, and the polarities of the ends of the four fourth magnets 2241 facing the voice coil 32 are both N poles or both S poles, which is not limited herein.

In this embodiment, the fourth magnet 2241 of the fourth magnetic group 224 may have a square strip or plate structure; or, the fourth magnets 2241 include a plurality of fourth magnets 2241, and the plurality of fourth magnets 2241 are respectively adjacent along the long side 321 and the short side 322 and are arranged between the first magnetic group 221 and the magnetic guiding yoke 21 in parallel, so that the plurality of fourth magnets 2241 cooperate to form a square strip or plate structure, which is not limited herein.

In an embodiment, the voice coil 32 is rectangular and annular, the voice coil 32 has a long side 321 and a short side 322 connected end to end, the fourth magnet group 224 is divided along two diagonal lines to form four fourth magnets 2241, two fourth magnets 2241 are arranged in parallel along the direction of the short side 322, the other two fourth magnets 2241 are arranged in parallel along the direction of the long side 321, the four fourth magnets 2241 are magnetized along the direction of the short side 322 and the direction of the long side 321 respectively, the magnetizing directions of the two fourth magnets 2241 arranged along the direction of the short side 322 are opposite, and the magnetizing directions of the other two fourth magnets 2241 arranged along the direction of the long side 321 are opposite.

In this embodiment, as shown in fig. 11, the upper and lower surfaces of the fourth magnetic group 224 are substantially rectangular, the fourth magnetic group 224 is divided along two diagonal lines to form four fourth magnets 2241, and the four fourth magnets 2241 may be formed by dividing one fourth magnetic group 224, or may be formed by splitting a split structure to form the fourth magnetic group 224. Optionally, two fourth magnets 2241 are disposed in parallel along the direction of the short side 322, the other two fourth magnets 2241 are disposed in parallel along the direction of the long side 321, the four fourth magnets 2241 are magnetized along the direction of the short side 322 and the direction of the long side 321, respectively, the magnetizing directions of the two fourth magnets 2241 disposed along the direction of the short side 322 are opposite, and the magnetizing directions of the other two fourth magnets 2241 disposed along the direction of the long side 321 are opposite.

Alternatively, the four fourth magnets 2241 have N poles or S poles toward the ends of the voice coil 32. Four fourth magnets 2241 of the fourth magnetic group 224 are horizontally laid and located between the first magnetic group 221 and the magnetic yoke 21. Alternatively, the two fourth magnets 2241 are symmetrically disposed at the intersection of the two diagonals of the fourth magnetic group 224, and the two fourth magnets 2241 are symmetrically disposed at the intersection of the two diagonals of the fourth magnetic group 224.

It will be appreciated that the four fourth magnets 2241 are all arranged in a triangle shape, such that the top angles of the four fourth magnets 2241 coincide with the intersection points of the two diagonal lines of the fourth magnetic group 224.

Optionally, the four fourth magnets 2241 are magnetized in the horizontal direction, the magnetizing directions of the two fourth magnets 2241 are opposite, the magnetizing directions of the other two fourth magnets 2241 are opposite, and the magnetizing directions of the four fourth magnets 2241 are perpendicular to the direction of the bottom edge opposite to the intersection point of the two diagonal lines of the fourth magnetic group 224, and the polarities of the ends of the four fourth magnets 2241 facing the voice coil 32 are both N-poles or both S-poles, which is not limited herein.

In an embodiment, at least part of the projection of the second magnetic group 222 in the vibration direction perpendicular to the vibration system 3 coincides with the projection of the voice coil 32 in the vibration direction perpendicular to the vibration system 3. It can be appreciated that the arrangement is such that the magnetic induction lines of the first magnetic group 221 and the third magnetic group 223 of the central magnetic portion 22 are concentrated in the second magnetic group 222 and pass through the magnetic gap 24, so as to increase the density of the magnetic flux of the magnetic gap 24, and the voice coil 32 is in a more reasonable magnetic field, so as to alleviate the distortion condition of the audio output by the sound generating device 100, and improve the tone quality of the audio output by the sound generating device 100. Optionally, the projection of the second magnetic group 222 in the horizontal direction is located in the projection of the voice coil 32 in the horizontal direction.

In an embodiment, at least a portion of a side of the third magnetic group 223 facing away from the second magnetic group 222 protrudes toward a side facing away from the second magnetic group 222 to form a protrusion 2234.

In the present embodiment, as shown in fig. 3,4 and 6, the third magnetic group 223 includes a central portion 2232 and a rim portion 2233, the rim portion 2233 is disposed around the outer periphery of the central portion 2232, and one side of the central portion 2232 facing away from the second magnetic group 222 protrudes from the rim portion 2233 facing away from the second magnetic group 222 and forms a protruding portion 2234. Optionally, the central portion 2232 and the rim portion 2233 of the third magnetic stack 223 are integrally formed. Of course, in other embodiments, the center portion 2232 and the edge portion 2233 of the third magnetic group 223 may be configured as a separate structure, which is not limited herein.

Alternatively, the thickness of the center portion 2232 in the direction of movement of the voice coil 32 is optionally greater than the thickness of the edge portion 2233 in the direction of movement of the voice coil 32. I.e., the side surface of the central portion 2232 facing away from the second magnetic group 222 protrudes the side surface of the rim portion 2233 facing away from the second magnetic group 222 to form a protruding portion 2234.

It can be appreciated that, when the vibration system 3 is provided with a through structure through which the protrusion 2234 passes, and thus the sound generating apparatus 100 is applied to an electronic device, in order to reduce the Z-directional height of the electronic device, the protrusion 2234 of the central magnetic portion 22 in the sound generating apparatus 100 may be abutted against the inner wall of the housing of the electronic device, so that the front cavity structure can be formed without additional space, and the height difference between the protrusion 2234 of the central magnetic portion 22 and the vibration system 3 is not limited herein.

Of course, in other implementations, the thickness of the central portion 2232 along the direction of movement of the voice coil 32 may alternatively be the same as the thickness of the edge portion 2233 along the direction of movement of the voice coil 32. The diaphragm 31 of the vibration system 3 is disposed opposite to and spaced apart from the central magnetic portion 22, and is not limited thereto.

In an embodiment, the third magnetic group 223 includes a central portion 2232 and a rim portion 2233, the rim portion 2233 is circumferentially disposed on the outer periphery of the central portion 2232, and a side of the central portion 2232 facing away from the second magnetic group 222 protrudes from a side of the rim portion 2233 facing away from the second magnetic group 222 and forms a protruding portion 2234; the rim 2233 forms a closed integral ring structure; or, the edge portion 2233 includes a plurality of adjacent edge portions 2233 end to form a closed ring structure; alternatively, the rim 2233 includes a plurality of adjacent rims 2233 spaced apart to form a ring-shaped structure having a gap; or, the rim portion 2233 and the central portion 2232 are integrally formed.

In the present embodiment, as shown in fig. 3 and 6, the edge portion 2233 of the third magnetic group 223 includes a plurality of edge portions 2233 surrounding the outer periphery of the center portion 2232. Optionally, adjacent rim portions 2233 end-to-end to form a closed ring-like structure; or adjacent rims 2233 are spaced apart to form a ring-like structure with a gap. Of course, the rim 2233 may be formed as a closed integral ring structure provided on the outer periphery of the central portion 2232, and is not limited thereto.

It will be appreciated that the rim portion 2233 and the center portion 2232 of the third magnetic stack 223 may alternatively be integrally formed for ease of processing and organization.

In an embodiment, as shown in fig. 3 and 4, the diaphragm 31 is annular, and an inner periphery of the diaphragm 31 is fixed to an end surface of the rim 2233 facing away from the second magnetic group 222. Optionally, a top surface of the diaphragm 31 facing away from the second magnetic group 222 is not higher than a top surface of the protrusion 2234 facing away from the second magnetic group 222. In this way, the overall thickness of the product can be reduced.

In one embodiment, the edge of the third magnetic group 223 is provided with a avoidance structure 2235. In this embodiment, as shown in fig. 3, 4 and 6, by arranging the avoidance structure 2235 at the edge of the third magnetic group 223, that is, arranging structures such as a round angle, a chamfer angle or a step structure at the edge of the third magnetic group 223, the avoidance of the diaphragm 31 can be realized, meanwhile, the magnetic leakage is effectively prevented, and the BL value is improved.

Optionally, the relief structure 2235 is at least one of a sloped chamfer, a rounded corner, a chamfer, a stepped structure.

In one embodiment, the avoidance structures 2235 may be selected as sloped ramps. Optionally, the included angle formed by the avoidance structure 2235 and the surface of the third magnetic group 223 facing away from the second magnetic group 222 is greater than 90 ° and less than 180 °. In this embodiment, the range of the included angle formed by the avoidance structure 2235 and the surface of the third magnetic group 223 facing away from the second magnetic group 222 is further selected to be 100 ° to 150 °, which is not limited herein. Alternatively, the included angles are 100 °, 110 °,120 °, 130 °, 140 °, 150 °, etc., which are not limited herein.

It will be appreciated that the avoidance structure 2235 surrounds the periphery of the third magnetic group 223 on the side facing away from the second magnetic group 222, i.e., the avoidance structure 2235 is an integral annular ramp. Of course, in other embodiments, the avoidance structures 2235 include a plurality of avoidance structures 2235, and the plurality of avoidance structures 2235 are disposed at intervals and surround the periphery of the third magnetic group 223 on the side facing away from the second magnetic group 222, and at this time, two adjacent avoidance structures 2235 are not connected to each other and have a certain distance. Or the avoidance structures 2235 include a plurality of adjacent avoidance structures 2235 that are connected end to form a closed annular structure and encircle the periphery of the third magnetic group 223 on the side opposite to the second magnetic group 222, where the adjacent avoidance structures 2235 in the plurality of avoidance structures 2235 are adjacent and form an annular structure. Optionally, the included angles formed by the avoidance structures 2235 and the surface of the third magnetic group 223 facing away from the second magnetic group 222 may be the same, may be different, or may be at least partially the same, and is not limited herein.

Alternatively, the thickness of the first magnetic group 221 in the vibration direction of the vibration system 3 is smaller than or equal to the thickness of the second magnetic group 222 in the vibration direction of the vibration system 3. Alternatively, the thickness of the third magnetic group 223 in the vibration direction of the vibration system 3 is greater than or equal to the thickness of the second magnetic group 222 in the vibration direction of the vibration system 3. Alternatively, the thickness of the third magnetic group 223 in the vibration direction of the vibration system 3 is greater than or equal to the thickness of the first magnetic group 221 in the vibration direction of the vibration system 3. It will be appreciated that this ensures that the central magnetic portion 22 forms a halbach array of magnets, which can produce a relatively strong magnetic field.

In one embodiment, the side magnet 23 includes a side magnet 231 and a side magnetic conductive plate 232 that are stacked, and the side magnet 231 is connected to the magnetic conductive yoke 21; the first magnetic group 221, the third magnetic group 223 and the side magnet 231 are magnetized along the vibration direction of the vibration system 3, the magnetization direction of the first magnetic group 221 is opposite to the magnetization direction of the side magnet 231 of the side magnet 23, and the magnetization direction of the third magnetic group 223 is the same as the magnetization direction of the side magnet 231 of the side magnet 23.

In the present embodiment, as shown in fig. 2 to 5, the side magnet 231 and the side magnetic conductive plate 232 of the side magnetic portion 23 are stacked on the magnetic conductive yoke 21, and the side magnet 231 is connected to the magnetic conductive yoke 21. The side magnet 231 and the side magnetic conductive plate 232 of the side magnetic portion 23 are located outside the center magnetic portion 22 and are spaced apart to form the magnetic gap 24.

Alternatively, the magnetic pole of the side magnet 231 near the side magnetic conduction plate 232 is opposite to the magnetic pole of the first magnetic group 221 near the second magnetic group 222, and the magnetic pole of the side magnet 231 near the side magnetic conduction plate 232 is opposite to the magnetic pole of the third magnetic group 223 near the second magnetic group 222.

In one embodiment, the side magnetic portion 23 is optionally disposed in a ring shape, where the ring-shaped side magnetic portion 23 is located outside the central magnetic portion 22 and forms a magnetic gap 24 with the central magnetic portion 22 by being spaced apart. Optionally, the side magnets 231 and/or the side magnetically permeable plates 232 form a closed integral ring structure.

Of course, in other embodiments, the side magnetic portion 23 includes a plurality of side magnetic portions 23, and the plurality of side magnetic portions 23 are disposed around the outside of the central magnetic portion 22 and are surrounded by the central magnetic portion 22 to form the magnetic gap 24. Optionally, the side magnets 231 and the side magnetic plates 232 are plural and are disposed in one-to-one correspondence, and the adjacent side magnets 231 are connected end to form a closed ring structure. Or the side magnets 231 and the side magnetic conductive plates 232 are all multiple and are arranged in a one-to-one correspondence manner, adjacent side magnets 231 are spaced to form an annular structure with gaps, and adjacent side magnetic conductive plates 232 are spaced to form an annular structure with gaps; or the side magnets 231 form a closed integral annular structure, a plurality of side magnetic conductive plates 232 are arranged, and adjacent side magnetic conductive plates 232 are connected end to form a closed annular structure and are arranged corresponding to the annular side magnets 231; or the side magnetic plate 232 forms a closed integral annular structure, the side magnets 231 are plural, and the adjacent side magnets 231 are connected end to form a closed annular structure, and are arranged corresponding to the annular side magnetic plate 232, and the invention is not limited herein.

In order to facilitate the installation of the centering support piece 34, the plurality of side magnetic portions 23 are disposed around the outer side of the center magnetic portion 22, and a notch for avoiding the centering support piece 34 is provided between two adjacent side magnetic portions 23, which is not limited herein.

In the present embodiment, the side magnet 231 of the side magnet portion 23 and the first and third magnetic groups 221, 223 of the center magnet portion 22 are magnetized in the vertical direction, that is, in the moving direction of the voice coil 32. Alternatively, the magnetizing direction of the first magnetic group 221 is opposite to the magnetizing direction of the side magnet 231 of the side magnetic part 23, and the magnetizing direction of the third magnetic group 223 is the same as the magnetizing direction of the side magnet 231 of the side magnetic part 23.

It can be appreciated that when the first magnetic group 221 is magnetized from bottom to top, the third magnetic group 223 and the side magnet 231 are magnetized from top to bottom, that is, when the N pole of the first magnetic group 221 is up and the S pole is down, the N pole of the third magnetic group 223 and the side magnet 231 is down and the S pole is up; or when the first magnetic group 221 is magnetized from top to bottom, the third magnetic group 223 and the side magnet 231 are magnetized from bottom to top, that is, when the N pole of the first magnetic group 221 is on the bottom and the S pole is on the top, the N pole of the third magnetic group 223 and the N pole of the side magnet 231 are on the top and the S pole is on the bottom, which is not limited herein.

In an embodiment, as shown in fig. 1 to 5, the sound generating apparatus 100 further includes a housing 1, one end of the housing 1 is connected to the side magnetic plate 232, and the other end of the housing 1 is connected to the periphery of the diaphragm 31.

In the present embodiment, the side magnetic portion 23 includes a side magnet 231 and a side magnetic conductive plate 232 which are stacked, the side magnet 231 is connected to the magnetic conductive yoke 21, one end of the housing 1 is connected to the side magnetic conductive plate 232, and the other end of the housing 1 is connected to the periphery of the diaphragm 31. Alternatively, the side magnetic plate 232 is integrally formed with the housing 1.

It can be appreciated that when the housing 1 is a plastic part, the side magnetic plate 232 is integrally injection molded with the housing 1. When the housing 1 is a metal member, the side magnetic plate 232 and the housing 1 are formed by punching, blanking or riveting, and are not limited herein. The arrangement can effectively simplify the processing steps and improve the heat dissipation effect.

In one embodiment, the diaphragm 31 is annular, the inner periphery of the diaphragm 31 is fixed to the magnetic circuit 2, one end of the voice coil 32 is connected to the diaphragm 31, and the other end of the voice coil 32 is suspended in the magnetic gap 24.

In this embodiment, the diaphragm 31 includes an inner ring portion 311, a first collar 313 disposed around the inner ring portion 311, a flat portion 314 disposed around the first collar 313, a second collar 315 disposed around the flat portion 314, and a fixing portion 316 connected to the outer side of the second collar 315, wherein the fixing portion 316 is connected to the housing 1, and one end of the voice coil 32 is directly or indirectly connected to the flat portion 314. Optionally, the first folding ring 313 and the second folding ring 315 have a convex hull structure that is convex upward or a concave structure that is concave downward, which is not limited herein.

In order to strengthen the structural strength of the central portion of the diaphragm 31, the vibration system 3 further includes a vibration plate provided at the central portion of the diaphragm 31. It will be appreciated that, in order to reduce the weight of the vibration system 3, the center portion of the diaphragm 31 is provided with a hollow hole, and the vibration plate is connected to the center portion and covers the hollow hole. Optionally, a step surface is formed on the periphery of the vibration plate, and one side of the vibration film 31 adjacent to the hollowed hole is supported and connected to the step surface, and the step surface is located between the voice coil 32 and the vibration film 31. It can be understood that by providing the stepped surface at the periphery of the vibration plate so that the stepped surface is recessed toward one side of the voice coil 32, when it is ensured that the central portion of the diaphragm 31 is lap-supported on the stepped surface of the vibration plate, the upper surface of the central portion of the diaphragm 31 is flush with the upper surface of the vibration plate, so that the assembly structure is more compact, and the vibration performance of the whole diaphragm 31 is ensured.

In one embodiment, the vibration system 3 further includes a frame 33, and the voice coil 32 is connected to the diaphragm 31 through the frame 33.

In this embodiment, as shown in fig. 3 and 4, by providing the frame 33, the voice coil 32 is connected with the diaphragm 31 through the frame 33, so that the voice coil 32 is ensured to be in a more reasonable magnetic field, that is, a region with the largest magnetic flux density, thereby effectively improving the BL value.

In one embodiment, the skeleton 33 includes a main body 331 and a connecting portion 332 connected to a periphery of the main body 331, and the main body 331 is disposed between the diaphragm 31 and the sound tube 32; the vibration system 3 further includes a centering pad 34, the centering pad 34 includes an outer fixing portion 341, an inner fixing portion 342, and a spring wall portion 343 connecting the outer fixing portion 341 and the inner fixing portion 342, the outer fixing portion 341 is connected to the housing 1 and/or the side magnetic portion 23, and the inner fixing portion 342 is connected to the connecting portion 332.

In this embodiment, as shown in fig. 3 and 4, the main body 331 of the skeleton 33 may be selected to have a ring-shaped structure, that is, the main body 331 is provided in a ring shape, and the main body 331 is provided around the central magnetic portion 22. Alternatively, the main body 331 is disposed in a rectangular ring shape, the connection portion 332 includes a plurality of connection portions 332, and the plurality of connection portions 332 are disposed at four corners of the main body 331.

It can be appreciated that by providing the centering support 34, the lead wire of the voice coil 32 can be connected and conducted with an external circuit by using the centering support 34, and the problem of swinging or polarization of the voice coil 32 during the vibration process can be avoided by using the centering support 34.

In an embodiment, the centering support 34 includes a plurality of centering support 34, one ends of the plurality of centering support 34 are respectively connected to the connection portion 332 of the frame 33, and the leads of the voice coil 32 extend to the centering support 34 along the connection portion 332, and the other ends of the plurality of centering support 34 are respectively connected to the housing 1 and/or the side magnetic portion 23, so that the operational stability of the vibration system 3 can be improved.

Optionally, the plurality of centering struts 34 are correspondingly distributed along the long axis direction and/or the short axis direction of the magnetic circuit system 2 and/or the diagonal or four corner positions of the magnetic circuit system 2. It can be appreciated that the plurality of centering support pieces 34 may be symmetrically distributed along the long axis direction of the magnetic circuit system 2; the plurality of centering support pieces 34 can also be symmetrically distributed along the short axis direction of the magnetic circuit system 2; the plurality of centering support pieces 34 can also be correspondingly arranged at opposite angles of the magnetic circuit system 2; the plurality of centering support pieces 34 may also be disposed at four corners of the magnetic circuit 2. Of course, in other embodiments, the plurality of centering support pieces 34 may be correspondingly distributed along the long axis direction of the magnetic circuit system 2, the short axis direction of the magnetic circuit system 2, and the diagonal or four corner positions of the magnetic circuit system 2, which is not limited herein.

Alternatively, the centering support 34 may include two or four, so that the voice coil 32 can be connected to an external circuit by the centering support 34, and the vibration balance of the sound generating apparatus 100 can be ensured.

It can be understood that when the number of the centering support pieces 34 is two, the two centering support pieces 34 are arranged at intervals along the long axis direction of the magnetic circuit system 2; or, the two centering support pieces 34 are arranged at intervals along the short axis direction of the magnetic circuit system 2, which is not limited herein. Of course, when the number of the centering support pieces 34 is four, the four centering support pieces 34 may be correspondingly disposed along four corners of the magnetic circuit system 2. The present invention is not particularly limited herein with respect to the arrangement of centering tabs 34.

In one embodiment, each positioning support 34 includes an outer fixing portion 341, a spring wall portion 343, and an inner fixing portion 342 connected in sequence, the outer fixing portion 341 is connected to the housing 1, the inner fixing portion 342 is connected to the connecting portion 332, the inner fixing portion 342 is provided with an inner bonding pad, and the lead wire of the voice coil 32 extends to the inner bonding pad along the connecting portion 332.

In this embodiment, as shown in fig. 2, 3 and 5, the outer fixing portion 341, the elastic wall portion 343 and the inner fixing portion 342 of the centering support 34 may be selected as an integrally formed structure. Thus, the structural strength of the centering support 34 can be effectively ensured, and the processing steps of the centering support 34 are simplified. It will be appreciated that the spring wall portion 343 has at least one bend in order to ensure deformability of the centering web 34.

It will be appreciated that, in order to facilitate the wire routing connection of the voice coil 32 and to facilitate connection and conduction with an external circuit, the inner fixing portion 342 is provided with an inner bonding pad, and the wire of the voice coil 32 extends to the inner bonding pad along the connection portion 332.

In one embodiment, as shown in fig. 2, 3 and 5, the outer fixing portion 341, the elastic wall portion 343 and the inner fixing portion 342 of the centering bracket 34 may be located on the same plane. Of course, in other embodiments, the outer fixing portion 341 and the inner fixing portion 342 of the centering bracket 34 may also be located on different planes. It can be appreciated that the centering support 34 is used to connect an external circuit with the voice coil 32, and the centering support 34 can be used to effectively avoid the problem of oscillation or polarization of the voice coil 32 during the vibration process.

In an embodiment, the diaphragm 31 includes an inner ring portion 311, a first collar 313 disposed around the inner ring portion 311, a straight portion 314 disposed around the first collar 313, a second collar 315 disposed around the straight portion 314, and a fixing portion 316 connected to an outer side of the second collar 315, the fixing portion 316 is connected to the housing 1, the straight portion 314 is directly or indirectly connected to the voice coil 32, and the inner ring portion 311 is connected to the third magnetic group 223; wherein, the inner ring portion 311 is flat and plate-shaped and is attached to the third magnetic group 223; or, the inner ring portion 311 is formed with an inner ring hole 312, and at least a part of the third magnetic group 223 is protruded from the inner ring hole 312.

In this embodiment, as shown in fig. 1, 3 and 4, the inner ring portion 311, the first ring portion 313, the flat portion 314, the second ring portion 315 and the fixing portion 316 of the diaphragm 31 may be selected as an integrally formed structure, so as to ensure the vibration performance and structural strength of the diaphragm 31.

It will be appreciated that the first and second refraction rings 313 and 315 of the diaphragm 31 have a convex hull structure that is convex upward or a concave structure that is concave downward, which are not limited herein. Alternatively, the protruding direction of the first collar 313 is opposite to the protruding direction of the second collar 315. In this embodiment, the first folding ring 313 protrudes in a direction away from the magnetic yoke 21, and the second folding ring 315 protrudes in a direction close to the magnetic yoke 21, that is, the protruding direction of the first folding ring 313 is upward, so that interference with the central magnetic portion 22 can be effectively avoided; the protruding direction of the second folding ring 315 is downward, so when the sound generating apparatus 100 is applied to an electronic device, the height difference between the first folding ring 313 and the second folding ring 315 of the diaphragm 31 can be utilized to form a front sound cavity structure, so as to effectively reduce the height dimension of the electronic device in the Z direction.

It should be noted that, the diaphragm 31 and the voice coil 32 may be directly connected, for example, one end of the voice coil 32 is connected to the straight portion 314 of the diaphragm 31, and the other end of the voice coil 32 is suspended from the magnetic gap 24. Of course, the diaphragm 31 and the voice coil 32 may be indirectly connected, for example, the diaphragm 31 is connected to the voice coil 32 through the frame 33, that is, the flat portion 314 of the diaphragm 31 is connected to the main body portion 331 of the frame 33, one side of the main body portion 331 facing away from the flat portion 314 is connected to one end of the voice coil 32, and the other end of the voice coil 32 is suspended in the magnetic gap 24, which is not limited herein.

In this embodiment, the inner ring portion 311 of the diaphragm 31 may be a sealing structure, that is, the inner ring portion 311 is flat, and the inner ring portion 311 is connected to the side of the third magnetic group 223 facing away from the second magnetic group 222.

Of course, the diaphragm 31 may be disposed in a ring shape, and at this time, an inner ring hole 312 is formed in the center of the inner ring portion 311, and the inner ring portion 311 is connected to the edge of the third magnetic group 223, so that a portion of the third magnetic group 223 is disposed corresponding to the inner ring hole 312. In the present embodiment, the protruding portion 2234 of the third magnetic group 223 is protruding from the inner ring hole 312, that is, the inner ring portion 311 of the diaphragm 31 is connected to the edge portion 2233 of the third magnetic group 223.

In one embodiment, as shown in fig. 3 and 4, the diaphragm 31 further includes a reinforcing portion 318, and the reinforcing portion 318 is disposed on the straight portion 314. It can be appreciated that by providing the reinforcement portion 318, the structural strength of the straight portion 314 of the diaphragm 31 can be effectively enhanced, so as to improve the connection stability of the voice coil 32, and avoid the diaphragm 31 from tearing when the voice coil 32 drives the diaphragm 31 to vibrate. Optionally, a reinforcement 318 is provided between the straight portion 314 and the backbone 33.

In an embodiment, as shown in fig. 2 to 4, an end of the fixing portion 316 away from the second folding ring 315 is folded and extended toward the housing 1 to form a folding portion 317, and the folding portion 317 is connected to an outer wall of the housing 1. It can be appreciated that the bending portion 317 is formed by bending down at the outer side of the fixing portion 316, so that the bending portion 317 is connected to the outer wall of the housing 1, thereby increasing the connection area with the housing 1 and improving the connection stability and sealing performance.

The invention also provides electronic equipment, which comprises the sounding device 100. The specific structure of the sound generating device 100 refers to the foregoing embodiments, and because the electronic device adopts all the technical solutions of all the foregoing embodiments, the sound generating device at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which are not described in detail herein.

In an embodiment, the electronic device further includes a device housing, the device housing has a mounting space, and the sound generating apparatus 100 is disposed in the mounting space of the device housing.

In this embodiment, the electronic apparatus further includes a flexible circuit board, one end of which is electrically connected to the sound generating device 100, and the other end of which is used for connecting to an external power source. It will be appreciated that the flexible circuit board is used to connect and conduct an external circuit to the sound emitting device 100. The flexible circuit board is provided with an inner bonding pad and an outer bonding pad, the inner bonding pad of the flexible circuit board is connected and conducted with the sound generating device 100, and the outer bonding pad of the flexible circuit board is used for being connected with an external terminal.

In this embodiment, the device housing has an installation space, the sound generating device 100 is disposed in the installation space of the device housing, and at least one end of the flexible circuit board connected with the sound generating device 100 is disposed in the installation space of the device housing. Of course, in other embodiments, the flexible circuit board may be disposed entirely in the installation space of the device housing, which is not limited herein.

It is understood that the electronic device may be an earphone, a mobile phone, a computer, a tablet computer, a smart wearable device, etc., and is not limited herein. In the electronic device, the sound generating apparatus 100 may be assembled into a housing of the electronic device in a module manner, or may be assembled into a housing of the electronic device in a single body. The electronic device may be a mobile phone, MP3, MP4, tablet, headset, wearable device, etc., which are not listed here.

The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structural modifications made by the present description and accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present invention.

Claims

1. A sound-generating device, characterized in that the sound-generating device comprises:

A magnetic circuit system, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion and a side magnetic portion arranged on the magnetic yoke, the side magnetic portion being located outside the central magnetic portion and spaced from the central magnetic portion to form a magnetic gap, the central magnetic portion comprising a first magnetic group, a second magnetic group and a third magnetic group arranged in a stacked manner;

A vibration system, the vibration system comprising a diaphragm and a voice coil connected to the diaphragm, the voice coil being arranged corresponding to the magnetic gap;

Among them, the central magnetic part also includes a fourth magnetic group arranged between the first magnetic group and the magnetic yoke, the first magnetic group and the third magnetic group are both magnetized along the vibration direction of the vibration system, and the magnetization direction of the first magnetic group is opposite to the magnetization direction of the third magnetic group, the second magnetic group and the fourth magnetic group are both magnetized along the vibration direction perpendicular to the vibration system, and the magnetization direction of the second magnetic group is opposite to the magnetization direction of the fourth magnetic group, so that the central magnetic part forms a Halbach magnetic circuit.

2. The sound-generating device according to claim 1 is characterized in that the magnetization direction of the second magnetic group is along the periphery of the second magnetic group toward the center of the second magnetic group, and the magnetization direction of the fourth magnetic group is along the center of the fourth magnetic group toward the periphery of the fourth magnetic group; or, the second magnetic group and the fourth magnetic group both have a first axis and a second axis perpendicular to the vibration direction of the vibration system, and the first axis and the second axis are perpendicular to each other, the magnetization direction of the second magnetic group is along the first axis and/or the second axis, and the magnetization direction of the fourth magnetic group is along the second axis and/or the first axis;

The magnetic pole of the second magnetic group near its center is the same as the magnetic pole of the first magnetic group near the fourth magnetic group, and the magnetic pole of the second magnetic group near its center is opposite to the magnetic pole of the fourth magnetic group near its center.

3. The sound-generating device according to claim 2, wherein the second magnetic group comprises a second magnet of an integral plate-shaped structure, and a through hole is provided at the center of the second magnet of the plate-shaped structure;

And/or, the fourth magnetic group includes a fourth magnet with an integral plate-like structure, and a through hole is opened at the center of the fourth magnet with the plate-like structure.

4. The sound-generating device according to claim 1, wherein the first magnetic group comprises a first magnet having an integral plate-like structure;

Or, the first magnetic group includes a plurality of first magnets, and the plurality of first magnets are arranged adjacent to each other and located between the second magnetic group and the fourth magnetic group; wherein the plurality of first magnets are magnetized along the vibration direction of the vibration system, and the magnetization directions of the plurality of first magnets are the same.

5. The sound-generating device according to claim 1, wherein the voice coil is in a rectangular ring shape, and the voice coil has a long side and a short side connected end to end;

The second magnetic group includes two second magnets, the two second magnets are adjacent to each other and arranged in parallel along the direction of the long side, the two second magnets are magnetized along the direction of the long side, and the magnetization directions of the two second magnets are opposite;

Or, the second magnetic group includes two second magnets, the two second magnets are adjacent to each other and arranged in parallel along the direction of the short side, the two second magnets are magnetized along the direction of the short side, and the magnetization directions of the two second magnets are opposite;

Or, the second magnetic group includes four second magnets, two of the second magnets are adjacent and arranged in parallel along the direction of the short side, and the other two second magnets are arranged at both ends of the two second magnets along the direction of the long side, and the four second magnets are magnetized along the direction of the short side and the direction of the long side respectively, the two second magnets arranged along the short side have opposite magnetization directions, and the other two second magnets arranged along the long side have opposite magnetization directions;

Or, the second magnetic group is divided along two diagonal lines to form four second magnets, two of the second magnets are arranged in parallel along the direction of the short side, and the other two of the second magnets are arranged in parallel along the direction of the long side. The four second magnets are magnetized along the direction of the short side and the direction of the long side, respectively, the two second magnets arranged along the short side have opposite magnetization directions, and the other two second magnets arranged along the long side have opposite magnetization directions.

6. The sound-generating device according to claim 1, characterized in that the third magnetic group comprises a third magnet of an integral plate-like structure;

Or, the third magnetic group includes a plurality of third magnets, and the plurality of third magnets are arranged adjacent to each other and located on a side of the second magnetic group facing away from the first magnetic group; wherein the plurality of third magnets are all magnetized along the vibration direction of the vibration system, and the magnetization directions of the plurality of third magnets are the same.

7. The sound-generating device according to claim 1, wherein the voice coil is in a rectangular ring shape, and the voice coil has a long side and a short side connected end to end;

The fourth magnetic group includes two fourth magnets, the two fourth magnets are adjacent to each other and arranged in parallel along the direction of the long side, the two fourth magnets are magnetized along the direction of the long side, and the magnetization directions of the two fourth magnets are opposite;

Or, the fourth magnetic group includes two fourth magnets, the two fourth magnets are adjacent to each other and arranged in parallel along the direction of the short side, the two fourth magnets are magnetized along the direction of the short side, and the magnetization directions of the two fourth magnets are opposite;

Or, the fourth magnetic group includes four fourth magnets, two of the fourth magnets are adjacent and arranged in parallel along the direction of the short side, and the other two of the fourth magnets are arranged at both ends of the two fourth magnets along the direction of the long side. The four fourth magnets are magnetized along the direction of the short side and the direction of the long side respectively, the magnetization directions of the two fourth magnets arranged along the short side are opposite, and the magnetization directions of the other two fourth magnets arranged along the long side are opposite;

Alternatively, the fourth magnetic group is divided along two diagonal lines to form four fourth magnets, two of the fourth magnets are arranged in parallel along the direction of the short side, and the other two of the fourth magnets are arranged in parallel along the direction of the long side, and the four fourth magnets are magnetized along the direction of the short side and the direction of the long side, respectively, the two fourth magnets arranged along the short side have opposite magnetization directions, and the other two fourth magnets arranged along the long side have opposite magnetization directions.

8. The sound-generating device as claimed in claim 1, characterized in that at least a portion of the projection of the second magnetic group along the vibration direction perpendicular to the vibration system coincides with the projection of the voice coil along the vibration direction perpendicular to the vibration system.

9 . The sound-generating device according to claim 1 , wherein at least a portion of a side of the third magnetic group facing away from the second magnetic group protrudes toward a side facing away from the second magnetic group to form a protrusion.

10. The sound-generating device according to claim 9, characterized in that the third magnetic group comprises a central portion and an edge portion, the edge portion is arranged around the periphery of the central portion, and a side of the central portion facing away from the second magnetic group protrudes from a side of the edge portion facing away from the second magnetic group to form the protruding portion;

The edge portion forms a closed integral annular structure; or, the edge portion includes a plurality of adjacent edge portions connected end to end to form a closed annular structure; or, the edge portion includes a plurality of adjacent edge portions spaced apart to form an annular structure with a gap; or, the edge portion and the center portion are an integrally formed structure.

11. The sound-generating device according to claim 10, characterized in that the top surface of the diaphragm facing away from the second magnetic group is not higher than the top surface of the protrusion facing away from the second magnetic group;

And/or, the diaphragm is annular, and the inner periphery of the diaphragm is fixed to the end surface of the edge portion facing away from the second magnetic group.

12. The sound-generating device according to claim 1, characterized in that an avoidance structure is provided at the edge of the third magnetic group, and the avoidance structure is at least one of an inclined surface, a fillet, a chamfer, and a step structure;

The avoidance structure is disposed around the periphery of the third magnetic group on the side facing away from the second magnetic group; or, the avoidance structure includes a plurality of avoidance structures, the plurality of avoidance structures are arranged at intervals, and are disposed around the periphery of the third magnetic group on the side facing away from the second magnetic group; or, the avoidance structure includes a plurality of adjacent avoidance structures connected end to end to form a closed ring structure, and are disposed around the periphery of the third magnetic group on the side facing away from the second magnetic group;

And/or, an angle formed by the avoidance structure and a surface of the third magnetic group facing away from the second magnetic group is greater than 90° and less than 180°.

13. The sound-generating device according to any one of claims 1 to 12, characterized in that the edge magnet portion comprises a stacked edge magnet and an edge magnetic conductive plate, and the edge magnet is connected to the magnetic conductive yoke;

The first magnetic group, the third magnetic group and the edge magnet are all magnetized along the vibration direction of the vibration system. The magnetization direction of the first magnetic group is opposite to the magnetization direction of the edge magnet of the edge magnet part, and the magnetization direction of the third magnetic group is the same as the magnetization direction of the edge magnet of the edge magnet part.

14. The sound-generating device according to claim 13, characterized in that the sound-generating device further comprises a shell, one end of the shell is connected to the edge magnetic plate, and the other end of the shell is connected to the periphery of the diaphragm.

15. The sound-generating device according to claim 14, characterized in that the side magnetic conductive plate and the housing are an integrally formed structure;

And/or, the diaphragm is annular, the inner periphery of the diaphragm is fixed to the magnetic circuit system, one end of the voice coil is connected to the diaphragm, and the other end of the voice coil is suspended in the magnetic gap.

16. The sound-generating device according to claim 14, wherein the vibration system further comprises a frame, and the voice coil is connected to the diaphragm via the frame.

17. The sound-generating device according to claim 16, wherein the frame comprises a main body and a connecting portion connected to the periphery of the main body, and the main body is disposed between the diaphragm and the voice coil;

The vibration system also includes a centering support plate, which includes an external fixing portion, an internal fixing portion, and an elastic wall portion connecting the external fixing portion and the internal fixing portion, the external fixing portion is connected to the outer shell and/or the edge magnetic portion, and the internal fixing portion is connected to the connecting portion.

18. The sound-generating device according to claim 14, characterized in that the diaphragm comprises an inner ring portion, a first folded ring arranged around the inner ring portion, a straight portion arranged around the first folded ring, a second folded ring arranged around the straight portion, and a fixed portion connected to the outer side of the second folded ring, the fixed portion is connected to the housing, the straight portion is directly or indirectly connected to the voice coil, and the inner ring portion is connected to the third magnetic group;

The inner ring portion is in the shape of a flat plate and fits with the third magnetic group; or, the inner ring portion is formed with an inner ring hole, and at least part of the third magnetic group is protruding from the inner ring hole.

19. The sound-generating device according to claim 18, wherein the inner ring portion, the first folded ring, the straight portion, the second folded ring and the fixing portion are an integrally formed structure;

And/or, the first fold ring protrudes in a direction away from the magnetic yoke, and the second fold ring protrudes in a direction close to the magnetic yoke;

And/or, the diaphragm further comprises a reinforcement portion, and the reinforcement portion is arranged on the straight portion;

And/or, one end of the fixing portion away from the second fold ring is bent and extended toward the shell to form a bent portion, and the bent portion is connected to the outer wall of the shell.

20. An electronic device, characterized in that the electronic device comprises the sound-generating device according to any one of claims 1 to 19.