Sound production device and electronic equipment

Abstract

The invention provides a sound production device and electronic equipment, the sound production device comprises a shell, a vibration system and a magnetic circuit system, the vibration system and the magnetic circuit system are connected to the shell, and the vibration system comprises a diaphragm assembly and a voice coil; the magnetic circuit system comprises two magnetic circuit assemblies which are arranged at an interval, a magnetic gap for insertion of the voice coil is formed between the two magnetic circuit assemblies, and each magnetic circuit assembly comprises a first magnet, a second magnet, a third magnet, a fourth magnet and a fifth magnet which are arranged in a laminated mode in the vibration direction of the vibration system; the first magnet, the third magnet and the fifth magnet are magnetized in the vibration direction of the vibration system, the magnetizing directions of the first magnet and the third magnet are opposite, the magnetizing directions of the first magnet and the third magnet are the same as the magnetizing directions of the fifth magnet, and the second magnet and the fourth magnet are magnetized in the direction perpendicular to the vibration direction of the vibration system and the magnetizing directions are opposite. Therefore, each magnetic circuit assembly forms a Halbach magnetic circuit. According to the invention, the problem of poor product performance caused by the fact that the BL value is not increased due to the limitation of the spatial size of the existing sound production device can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducer, and in particular to a sound-generating device and electronic equipment using the sound-generating device. Background Art

[0002] In recent years, convenient electronic devices (such as mobile phones, headphones, and computers) have become part of people's daily lives. With the rapid development of technology, people's demand for the sound quality of electronic devices has become higher and higher, and full-range and miniaturized speakers have become mainstream demands.

[0003] At present, the box space in electronic devices is getting smaller and smaller, and the BL value of the sound-emitting device (referring to the product of the gap magnetic induction intensity B and the effective voice coil length L) is limited by the space size, resulting in a small number of magnetic lines passing through the voice coil, which leads to a smaller magnetic field force on the voice coil, making the sound-emitting device low in sensitivity and poor in overall acoustic performance and sound quality. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide a sound-generating device and an electronic device to solve the problem that the BL value of the existing sound-generating device does not increase due to space size limitations, resulting in poor product performance.

[0005] The present invention provides a sound-generating device, comprising: a housing, a vibration system connected to the housing, and a magnetic circuit system, wherein:

[0006] The vibration system includes a diaphragm assembly and a flat voice coil connected to the diaphragm assembly;

[0007] The magnetic circuit system comprises two magnetic circuit components arranged at intervals, a magnetic gap for the voice coil to be inserted is formed between the two magnetic circuit components, and each magnetic circuit component comprises a first magnet, a second magnet, a third magnet, a fourth magnet and a fifth magnet stacked along the vibration direction of the vibration system; wherein,

[0008] The first magnet, the third magnet and the fifth magnet are magnetized along the vibration direction of the vibration system, and the magnetization directions of the first magnet and the third magnet are opposite and the same as the magnetization direction of the fifth magnet. The second magnet and the fourth magnet are magnetized along a vibration direction perpendicular to the vibration system and in opposite directions, so that each magnetic circuit component forms a Halbach magnetic circuit.

[0009] In addition, a preferred solution is that the width of the first magnet is smaller than the width of the second magnet;

[0010] and / or, the width of the second magnet is smaller than the width of the third magnet;

[0011] And / or, the width of the third magnet is the same as the width of the fourth magnet and the width of the fifth magnet.

[0012] In addition, a preferred solution is that the magnetization directions of the first magnets of the two magnetic circuit assemblies are opposite, the magnetization directions of the second magnets of the two magnetic circuit assemblies are the same, the magnetization directions of the third magnets of the two magnetic circuit assemblies are opposite, the magnetization directions of the fourth magnets of the two magnetic circuit assemblies are the same, and the magnetization directions of the fifth magnets of the two magnetic circuit assemblies are opposite.

[0013] In addition, a preferred solution is that two driving edges of the voice coil arranged along the vibration direction of the vibration system are respectively arranged opposite to the second magnet and the fourth magnet in each group of magnetic circuits.

[0014] In addition, a preferred solution is that the magnetic circuit system further includes a magnetic yoke connected to the shell, and the two magnetic circuit components are fixed on the same side of the magnetic yoke.

[0015] In addition, a preferred solution is that the diaphragm assembly includes the reinforcement portion corresponding to the magnetic circuit assembly and a folding ring portion connected to the outer periphery of the reinforcement portion, wherein:

[0016] The inner edge of the folding ring portion is connected to the reinforcing portion, and the outer edge of the folding ring portion is connected to the shell.

[0017] In addition, a preferred solution is that a protrusion is provided on a side of the reinforcement portion facing the magnetic circuit assembly, and the voice coil is connected to the protrusion.

[0018] In addition, a preferred solution is that the vibration system further includes a frame, and the voice coil is connected to the reinforcement part through the frame, wherein:

[0019] One side of the frame is connected to the reinforcing part, and the other side of the frame is connected to the voice coil, so that the voice coil is suspended in the magnetic gap.

[0020] In addition, a preferred solution is that the vibration system also includes a centering support plate, wherein one end of the centering support plate is connected to the shell, and the other end of the centering support plate is connected to the voice coil and electrically connected to the lead of the voice coil.

[0021] The present invention also provides an electronic device, comprising the above-mentioned sound-generating device.

[0022] It can be seen from the above technical solutions that the sound-emitting device and electronic device provided by the present invention, by setting the magnetic circuit structure as two groups of magnetic circuit components and setting each magnetic circuit structure as a Halbach magnetic circuit, the magnetic lines of force are effectively gathered and evenly pass through the voice coil to form a magnetic circuit, thereby effectively improving the BL value, improving the sensitivity of the sound-emitting device, effectively improving the flatness of the BL curve, significantly improving the FR frequency response curve, and effectively reducing the harmonic distortion THD, so that the sound effect and performance of the whole machine are better improved.

[0023] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0025] Figure 1 is an exploded view of a sound-generating device according to an embodiment of the present invention;

[0026] Figure 2 is a schematic cross-sectional structural diagram of a sound-generating device according to an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of magnetization of a sound-generating device according to an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of the magnetic circuit structure of a sound-generating device according to an embodiment of the present invention;

[0029] Figure 5 , Figure 6 They are respectively schematic top view structures of sound-generating devices according to embodiments of the present invention.

[0030] Reference numerals include:

[0031] 1. diaphragm assembly, 11. reinforcement portion, 12. folding ring portion, 111. protruding portion;

[0032] 2. Voice coil;

[0033] 3. Shell; 4. Frame; 5. Centering support piece;

[0034] 6. Magnetic circuit system,

[0035] 61. left magnetic circuit assembly, 611. first magnet of left magnetic circuit, 612. second magnet of left magnetic circuit, 613. third magnet of left magnetic circuit, 614. fourth magnet of left magnetic circuit, 615. fifth magnet of left magnetic circuit,

[0036] 62, right magnetic circuit assembly, 621, first magnet of right magnetic circuit, 622, second magnet of right magnetic circuit, 623, third magnet of right magnetic circuit, 624, fourth magnet of right magnetic circuit, 625, fifth magnet of right magnetic circuit;

[0037] 7. Magnetic yoke. 8. Magnetic gap.

[0038] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0039] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

[0040] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In order to solve the aforementioned problem that the BL value of the existing sound-generating device does not increase due to space size limitation, resulting in poor product performance, the present invention proposes a sound-generating device and an electronic device.

[0042] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] In order to illustrate the structure of the sound generating device provided by the present invention, Figures 1 to 6 The structure of the sound-generating device is exemplarily indicated from different angles. Specifically, Figure 1 The explosion structure of the sound generating device according to an embodiment of the present invention is shown; Figure 2 The cross-sectional structure of the sound generating device according to the embodiment of the present invention is shown; Figure 3 The magnetizing structure of the sound generating device according to the embodiment of the present invention is shown; Figure 4The magnetic circuit structure of the sound generating device according to an embodiment of the present invention is shown; Figure 5 , Figure 6 The top view structures of the sound-generating devices according to the embodiments of the present invention are respectively shown.

[0044] like Figures 1 to 6 As shown together, the sound-generating device provided by the present invention comprises: a shell 3, a vibration system and a magnetic circuit system 6 connected to the shell 3, wherein the vibration system comprises a diaphragm assembly 1 and a flat voice coil 2 connected to the diaphragm assembly 1; the magnetic circuit system 6 comprises two magnetic circuit assemblies arranged at intervals, a magnetic gap 8 for the voice coil 2 to be inserted is formed between the two magnetic circuit assemblies, and each magnetic circuit assembly comprises a first magnet, a second magnet, a third magnet, a fourth magnet and a fifth magnet stacked along the vibration direction of the vibration system; wherein the first magnet, the third magnet and the fifth magnet are magnetized along the vibration direction of the vibration system, and the magnetization direction of the first magnet is opposite to that of the third magnet and the same as that of the fifth magnet, and the second magnet and the fourth magnet are magnetized along the vibration direction perpendicular to the vibration direction of the vibration system and in opposite directions, so that each magnetic circuit assembly forms a Halbach magnetic circuit.

[0045] In the present invention, the polarity of the end of the second magnet facing the voice coil 2 is the same as the polarity of the end of the first magnet close to the second magnet, and the polarity of the end of the fourth magnet facing the voice coil 2 is the same as the polarity of the end of the fifth magnet close to the fourth magnet.

[0046] In an embodiment of the present invention, the sound-generating device may be a sound-generating unit of a loudspeaker, and the loudspeaker may be a micro-loudspeaker. It should be noted that the magnetic circuit system 6 and the vibration system of the sound-generating device are arranged relative to each other. Optionally, the magnetic circuit system is arranged in a square shape. The vibration system is also arranged in a square shape. It is understandable that the periphery of the diaphragm assembly of the vibration system may be connected to the magnetic circuit system, or the magnetic circuit system and the vibration system may be respectively assembled on the module housing, etc., which is not limited here.

[0047] In order to better assemble the magnetic circuit system and vibration system of the sound device, Figures 1 to 6In the illustrated embodiment, the sound-generating device includes a shell 3, a magnetic circuit system 6 connected to one end of the shell 3, and a vibration system connected to the other end of the shell 3 and arranged opposite to the magnetic circuit system 6, that is, the periphery of the diaphragm assembly of the vibration system is connected to the other end of the shell 3 and arranged opposite to the magnetic circuit system 6. In the present embodiment, the shell 3 is used to install, fix and support components such as the magnetic circuit system and the vibration system, that is, the shell 3 provides an installation basis for components such as the magnetic circuit system and the vibration system. It can be understood that the shell 3 can be an integral structure or can be formed by the cooperation of multiple split structures, which is not limited here. The shell 3 in the present embodiment can be selected as a square frame or frame structure, that is, the shell 3 has a cavity with openings at both ends, and the magnetic circuit system and the vibration system are respectively connected to the two sides of the shell 3, so that the magnetic circuit system, the shell 3 and the diaphragm assembly 1 of the vibration system are enclosed to form a vibration cavity.

[0048] Among them, the sound-generating device is applied to the electronic device, that is, the sound-generating device can be installed in the electronic device through the housing 3. It should be noted that the housing 3 of the sound-generating device can be a housing or box structure independent of the electronic device. In this case, the housing 3 is used to integrate the magnetic circuit system and the vibration system and other components of the sound-generating device into an integral structure, so as to facilitate disassembly and assembly. Of course, the housing 3 of the sound-generating device can also be an integrally formed structure with the housing or box structure of the electronic device, which can effectively improve the structural strength and sealing performance.

[0049] In this embodiment, the housing 3 is used to accommodate structures such as the vibration system and the magnetic circuit system, so that the sound-generating device can be used as an independent component in an electronic device or a sound module, which is not limited here. Of course, in other embodiments, the sound-generating device can also be a module structure, in which case the vibration system and the magnetic circuit system of the sound-generating unit are installed as multiple independent components on the housing 3 of the module structure, which is not limited here.

[0050] It can be understood that in this embodiment, two groups of magnetic circuit components (left magnetic circuit component 61 and right magnetic circuit component 62) are spaced apart to form a magnetic gap, so that the folded ring part of the vibration system is connected to the end of the shell away from the magnetic yoke 7, and is opposite to and spaced from the magnetic circuit system, thereby connecting one end of the voice coil 2 to the reinforcement part, and the other end of the voice coil 2 is suspended in the magnetic gap 8.

[0051] In order to increase the BL value. In an embodiment of the present invention, Figures 1 to 6As shown, by arranging the magnetic circuit components in the magnetic circuit system 6 into two groups of magnetic circuit components arranged at intervals, a magnetic gap for the voice coil to be inserted is formed between the two groups of magnetic circuit components, and the two groups of magnetic circuit components are symmetrically arranged about the voice coil, each magnetic circuit component includes a first magnet, a second magnet, a third magnet, a fourth magnet and a fifth magnet which are stacked; the first magnet, the third magnet and the fifth magnet are magnetized along the vibration direction of the vibration system, and the magnetization direction of the first magnet is opposite to that of the third magnet and the same as that of the fifth magnet, and the second magnet and the fourth magnet are magnetized along the vibration direction perpendicular to the vibration system and in opposite directions, so that the two magnetic circuit components form a Halbach magnetic circuit, the magnetic lines of force are effectively gathered, and evenly pass through the voice coil to form a magnetic loop, the BL value is effectively improved, the sensitivity of the sound-generating device is improved, the flatness of the BL curve is effectively improved, the FR frequency response curve is significantly improved, and the harmonic distortion THD is effectively reduced, so that the sound effect and performance of the whole machine are better improved.

[0052] In an embodiment of the present invention, the magnetic circuit system 6 includes two groups of magnetic circuit components, each of which includes a first magnet, a second magnet, a third magnet, a fourth magnet and a fifth magnet arranged in a stacked manner, wherein the first magnet is arranged along the length direction of the sound-generating device, the second magnet is arranged along the width direction of the sound-generating device, the third magnet is arranged along the length direction of the sound-generating device, the fourth magnet is arranged along the width direction of the sound-generating device, and the fifth magnet is arranged along the length direction of the sound-generating device. In an embodiment of the present invention, the width of the first magnet is smaller than the width of the second magnet, and / or the width of the second magnet is smaller than the width of the third magnet, and / or the width of the third magnet is the same as the width of the fourth magnet and the width of the fifth magnet.

[0053] In one embodiment, the magnetization directions of the first magnets of the two groups of magnetic circuit assemblies are opposite, the magnetization directions of the second magnets of the two magnetic circuit assemblies are the same, the magnetization directions of the third magnets of the two magnetic circuit assemblies are opposite, the magnetization directions of the fourth magnets of the two magnetic circuit assemblies are the same, and the magnetization directions of the fifth magnets of the two magnetic circuit assemblies are opposite.

[0054] like Figure 2 and Figure 4 As shown, the two groups of magnetic circuit components are respectively a left magnetic circuit component 61 and a right magnetic circuit component 62, wherein the left magnetic circuit component 61 includes a stacked left magnetic circuit first magnet 611, a left magnetic circuit second magnet 612, a left magnetic circuit third magnet 613, a left magnetic circuit fourth magnet 614 and a left magnetic circuit fifth magnet 615, and the right magnetic circuit component 62 includes a stacked right magnetic circuit first magnet 621, a right magnetic circuit second magnet 622, a right magnetic circuit third magnet 623, a right magnetic circuit fourth magnet 624 and a right magnetic circuit fifth magnet 625.

[0055] Among them, the first magnet 611 of the left magnetic circuit, the third magnet 613 of the left magnetic circuit and the fifth magnet 615 of the left magnetic circuit are magnetized along the vibration direction of the vibration system, and the magnetization direction of the first magnet 611 of the left magnetic circuit is opposite to that of the third magnet 613 of the left magnetic circuit and is the same as that of the fifth magnet 615 of the left magnetic circuit. The second magnet 612 of the left magnetic circuit and the fourth magnet 614 of the left magnetic circuit are magnetized along the vibration direction perpendicular to the vibration system and have opposite magnetization directions, so that the left magnetic circuit component 61 forms a Halbach magnetic circuit. The width of the first magnet 611 of the left magnetic circuit is smaller than that of the second magnet 612 of the left magnetic circuit, the width of the second magnet 612 of the left magnetic circuit is smaller than that of the third magnet 613 of the left magnetic circuit, and the width of the third magnet 613 of the left magnetic circuit is the same as that of the fourth magnet 614 of the left magnetic circuit and the fifth magnet 615 of the left magnetic circuit. It should be noted that, Figure 3 The direction of the arrow in the magnetic circuit system indicates the magnetization direction.

[0056] Among them, the first magnet 621 of the right magnetic circuit, the third magnet 623 of the right magnetic circuit and the fifth magnet 625 of the right magnetic circuit are magnetized along the vibration direction of the vibration system, and the magnetization direction of the first magnet 621 of the right magnetic circuit is opposite to that of the third magnet 623 of the right magnetic circuit and is the same as that of the fifth magnet 625 of the right magnetic circuit. The second magnet 622 of the right magnetic circuit and the fourth magnet 624 of the right magnetic circuit are magnetized along the vibration direction perpendicular to the vibration system and in opposite directions, so that the right magnetic circuit assembly 62 forms a Halbach magnetic circuit. The width of the first magnet 621 of the right magnetic circuit is smaller than that of the second magnet 622 of the right magnetic circuit, the width of the second magnet 622 of the right magnetic circuit is smaller than that of the third magnet 623 of the right magnetic circuit, and the width of the third magnet 623 of the right magnetic circuit is the same as that of the fourth magnet 624 of the right magnetic circuit and the fifth magnet 625 of the right magnetic circuit. It should be noted that, Figure 3 The arrow direction in the magnetic circuit system 6 indicates the magnetization direction.

[0057] In an embodiment of the present invention, the two driving edges of the voice coil 2 arranged along the vibration direction of the vibration system are respectively arranged opposite to the second magnet and the fourth magnet in each group of magnetic circuits. Specifically, the two driving edges of the voice coil 2 arranged along the vibration direction of the vibration system are respectively arranged opposite to the second magnet 612 of the left magnetic circuit, the fourth magnet 614 of the left magnetic circuit, the second magnet 622 of the right magnetic circuit, and the fourth magnet 624 of the right magnetic circuit. This structural setting can increase the number of magnetic lines of force passing through the voice coil 2, increase the magnetic field force on the voice coil 2, effectively improve the BL value, improve the sensitivity of the sound-generating device, and better improve the sound effect and performance of the whole machine.

[0058] It can be understood that the magnetic circuit assembly forms a Halbach magnetic array, which can generate a strong magnetic field. The voice coil drives the diaphragm assembly to vibrate and make sound through the magnetic field generated by the Halbach magnetic array, so that there is a strong magnetic field at the voice coil 2, which is beneficial to improve the sensitivity of controlling the diaphragm vibration; and the Halbach magnetic array allows the magnetic flux lines at the voice coil 2 to be evenly distributed and the magnetic field changes in the vibration direction of the diaphragm assembly have good linearity, which can effectively improve the sound quality of the audio output by the sound-emitting device, enhance the treble effect, and alleviate the distortion of the audio output by the sound-emitting device to a certain extent.

[0059] In an embodiment of the present invention, the magnetic circuit system further comprises a magnetic yoke 7 connected to the housing 3 , and the two magnetic circuit components are fixed on the same side of the magnetic yoke 7 . That is, the fifth magnet 615 of the left magnetic circuit and the fifth magnet 625 of the right magnetic circuit are both fixed on the same side of the magnetic yoke 7 .

[0060] In addition, in an embodiment of the present invention, the transversely arranged magnets of the two magnetic circuit components can be replaced with magnetic conductive plates. Replacing with magnetic conductive plates can also increase the number of magnetic lines of force passing through the voice coil 2, increase the magnetic field force on the voice coil 2, effectively improve the BL value, and play a role in improving the sensitivity of the sound-generating device. Specifically, the second magnet 612 of the left magnetic circuit, the fourth magnet 614 of the left magnetic circuit, the second magnet 622 of the right magnetic circuit, and the fourth magnet 624 of the right magnetic circuit are replaced with magnetic conductive plates, thereby improving the sensitivity of the sound-generating device. In specific applications, a suitable magnetic circuit structure can be selected according to actual conditions.

[0061] In an embodiment of the present invention, the diaphragm assembly 1 includes the reinforcement portion 11 corresponding to the magnetic circuit assembly and a folding ring portion 12 connected to the outer periphery of the reinforcement portion, wherein the inner edge of the folding ring portion 12 is connected to the reinforcement portion 11, and the outer edge of the folding ring portion 12 is connected to the shell 3.

[0062] In one embodiment, a protrusion 111 is provided on a side of the reinforcement portion 11 facing the magnetic circuit assembly, and the voice coil 2 is connected to the protrusion 111 .

[0063] The vibration system further includes at least two skeletons 4, the voice coil 2 is connected to the reinforcement part 11 of the diaphragm assembly 1 through the skeletons 4, and the two skeletons 4 are symmetrically arranged along the long axis direction of the voice coil 2. One side of the skeleton 4 is connected to the reinforcement part 11, and the other side of the skeleton 4 is connected to the voice coil 2, so that the voice coil 2 is suspended in the magnetic gap 8. This assembly structure is simple to assemble, saves space, and does not increase the width of the sound-generating device.

[0064] In addition, the vibration system further includes at least two centering support plates 5, wherein one end of the centering support plate 5 is connected to the housing 3, and the other end of the centering support plate 5 is connected to the voice coil 2 and electrically connected to the lead of the voice coil 2. The centering support plate 5 includes a first connection portion, a second connection portion, and an elastic arm for connecting the first connection portion and the second connection portion, wherein the first connection portion is connected to the voice coil 2, and the second connection portion is connected to the housing. The centering support plate 5 can prevent polarization from occurring during the vibration of the voice coil 2 and the skeleton 4, thereby improving the acoustic performance of the sound-generating device.

[0065] The present invention also provides an electronic device, which includes the above-mentioned sound-generating device. The specific structure of the sound-generating device refers to the above-mentioned embodiment. Since the electronic device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0066] In this embodiment, the electronic device is connected to the sound device via a flexible circuit board, one end of the flexible circuit board is electrically connected to the sound device, and the other end of the flexible circuit board is used to connect to an external power source. It can be understood that the flexible circuit board is used to connect the external circuit to the sound device.

[0067] In this embodiment, the electronic device may be a headset, a mobile phone, a laptop, a tablet computer, a smart wearable device, etc., which is not limited here. In the electronic device, the sound device may be assembled into the housing of the electronic device in the form of a module or in the form of a single body.

[0068] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: include: A housing, a vibration system and a magnetic circuit system connected to the housing, wherein: The vibration system includes a diaphragm assembly and a flat voice coil connected to the diaphragm assembly; The magnetic circuit system comprises two magnetic circuit components arranged at intervals, a magnetic gap for the voice coil to be inserted is formed between the two magnetic circuit components, and each magnetic circuit component comprises a first magnet, a second magnet, a third magnet, a fourth magnet and a fifth magnet stacked along the vibration direction of the vibration system; wherein, The first magnet, the third magnet and the fifth magnet are magnetized along the vibration direction of the vibration system, and the magnetization directions of the first magnet and the third magnet are opposite and the same as the magnetization direction of the fifth magnet. The second magnet and the fourth magnet are magnetized along a vibration direction perpendicular to the vibration system and in opposite directions, so that each magnetic circuit component forms a Halbach magnetic circuit.

2. The sound generating device according to claim 1, characterized in that: The width of the first magnet is smaller than the width of the second magnet; and / or, the width of the second magnet is smaller than the width of the third magnet; And / or, the width of the third magnet is the same as the width of the fourth magnet and the width of the fifth magnet.

3. The sound generating device according to claim 1, characterized in that: The magnetization directions of the first magnets of the two magnetic circuit assemblies are opposite, the magnetization directions of the second magnets of the two magnetic circuit assemblies are the same, the magnetization directions of the third magnets of the two magnetic circuit assemblies are opposite, the magnetization directions of the fourth magnets of the two magnetic circuit assemblies are the same, and the magnetization directions of the fifth magnets of the two magnetic circuit assemblies are opposite.

4. The sound generating device according to claim 1, characterized in that: Two driving edges of the voice coil arranged along the vibration direction of the vibration system are respectively arranged opposite to the second magnet and the fourth magnet in each group of magnetic circuits.

5. The sound generating device according to claim 1, characterized in that: The magnetic circuit system further comprises a magnetic yoke connected to the shell, and the two magnetic circuit components are fixed on the same side of the magnetic yoke.

6. The sound generating device according to claim 1, characterized in that: The diaphragm assembly includes the reinforcement portion corresponding to the magnetic circuit assembly and a folding ring portion connected to the outer periphery of the reinforcement portion, wherein: The inner edge of the folding ring portion is connected to the reinforcing portion, and the outer edge of the folding ring portion is connected to the shell.

7. The sound generating device according to claim 6, characterized in that: A protrusion is provided on one side of the reinforcement portion facing the magnetic circuit assembly, and the voice coil is connected to the protrusion.

8. The sound generating device according to claim 6, characterized in that: The vibration system further includes a frame, and the voice coil is connected to the reinforcement part through the frame, wherein: One side of the frame is connected to the reinforcing part, and the other side of the frame is connected to the voice coil, so that the voice coil is suspended in the magnetic gap.

9. The sound generating device according to claim 6, characterized in that: The vibration system further comprises a centering support plate, wherein one end of the centering support plate is connected to the housing, and the other end of the centering support plate is connected to the voice coil and electrically connected to the lead wire of the voice coil.

10. An electronic device, characterized in that: The device comprises a sound emitting device as claimed in any one of claims 1 to 9.

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