Sound production device and electronic equipment

Abstract

The utility model discloses a sounding device and an electronic device, and relates to the technical field of electroacoustic transduction, the sounding device comprises a magnetic circuit system and a vibration system, a central magnetic part of the magnetic circuit system comprises two central magnetic groups, an edge magnetic part comprises an outer magnetic group located at the outer sides of the two central magnetic groups and a common magnetic group located between the two central magnetic groups, the outer magnetic group and the common magnetic group are spaced from each central magnetic group so as to define two magnetic gaps which are arranged at intervals, each central magnetic group comprises a first central magnet, a central magnetic conductive plate and a second central magnet which are arranged in a stacked mode, and the outer magnetic group and the common magnetic group each comprise a first edge magnet, an edge magnetic conductive plate and a second edge magnet which are arranged in a stacked mode. The vibration system comprises a vibrating diaphragm and two voice coils, and each voice coil corresponds to one magnetic gap. According to the sounding device, the utilization rate of the magnetic circuit system is further improved by optimizing the magnetic circuit system and adopting the double voice coils, so that the loudness and the sensitivity of the sounding device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic transducers, and particularly relates to a sound generating device and an electronic device applying the sound generating device. Background Art

[0002] In recent years, portable electronic devices (such as mobile phones, earphones, computers) have penetrated into people's daily lives. With the rapid development of technology, the popularity rate of loudspeakers is getting higher and higher. People's requirements for loudspeakers are not only limited to the playback of video and audio, but also have higher requirements for the sound quality and reliability of the sound played by the loudspeakers. And the loudspeaker is directly related to the sound quality of the played sound and the stability of the product.

[0003] In related technologies, the micro loudspeakers applied in electronic devices such as tablets and laptop computers are usually large in size, and the existing large-size and ultra-thin loudspeakers usually adopt a single voice coil scheme, resulting in low utilization rate of the magnetic energy in the middle area of the central magnet in the magnetic circuit system, which fails to be effectively utilized, thus affecting the loudness and sensitivity of the micro loudspeaker. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a sound generating device and an electronic device, aiming to provide a sound generating device that can effectively utilize the magnetic circuit system. The sound generating device optimizes the magnetic circuit system and adopts a double voice coil to further improve the utilization rate of the magnetic circuit system, thereby improving the loudness and sensitivity of the sound generating device.

[0005] To achieve the above purpose, the utility model proposes a sound generating device, which comprises:

[0006] A housing provided with an installation cavity;

[0007] A magnetic circuit system arranged in the installation cavity. The magnetic circuit system includes a magnetic yoke, a central magnetic part and a side magnetic part arranged on the magnetic yoke. The central magnetic part includes two central magnetic groups arranged at intervals. The side magnetic part includes an outer magnetic group located outside the two central magnetic groups and a shared magnetic group located between the two central magnetic groups. The outer magnetic group and the shared magnetic group are both spaced from each central magnetic group to enclose and form two spaced magnetic gaps. Each central magnetic group includes a first central magnet, a central magnetic guide plate and a second central magnet arranged in a stacked manner. The outer magnetic group and the shared magnetic group both include a first side magnet, a side magnetic guide plate and a second side magnet arranged in a stacked manner; and

[0008] A vibration system arranged in the installation cavity. The vibration system includes a diaphragm and two voice coils connected to the diaphragm. The diaphragm has two long axis sides and two short axis sides connected end to end. The two central magnetic groups are arranged at intervals along the direction of the long axis side. Each voice coil is correspondingly arranged with a magnetic gap;

[0009] Among them, the first central magnet, the central magnetic conduction plate, and the second central magnet respectively correspond to the first side magnet, the side magnetic conduction plate, and the second side magnet in a one-to-one correspondence perpendicular to the vibration direction of the vibration system.

[0010] In an embodiment, both the first central magnet and the second central magnet are magnetized along the vibration direction of the vibration system, and the magnetic poles of the first central magnet and the second central magnet close to the central magnetic conduction plate are the same;

[0011] Both the first side magnet and the second side magnet are magnetized along the vibration direction of the vibration system, and the magnetic poles of the first side magnet and the second side magnet close to the side magnetic conduction plate are the same;

[0012] The magnetic poles of the first central magnet and the second central magnet close to the central magnetic conduction plate are opposite to the magnetic poles of the first side magnet and the second side magnet close to the side magnetic conduction plate.

[0013] In an embodiment, the magnetic yoke includes a first magnetic yoke and a second magnetic yoke arranged oppositely. The central magnetic part and the side magnetic part are both disposed between the first magnetic yoke and the second magnetic yoke. The first side magnet and the first central magnet are both connected to the first magnetic yoke, and the second side magnet and the second central magnet are connected to the second magnetic yoke.

[0014] In an embodiment, the outer shell further has a first through hole and a second through hole communicating with the installation cavity. The first magnetic yoke is connected to the outer shell and is located in the first through hole, and the second magnetic yoke is connected to the outer shell and is located in the second through hole.

[0015] In an embodiment, the diaphragm has an inner ring hole. The diaphragm is wound around the outside of the magnetic circuit system, and in the vibration direction of the vibration system, the two side surfaces of the diaphragm do not exceed the two side surfaces of the magnetic circuit system. The magnetic circuit system is provided with an avoidance notch communicating with each magnetic gap. The vibration system further includes a skeleton. One end of the skeleton is connected to the diaphragm, and the other end of the skeleton passes through the avoidance notch and is connected to each voice coil.

[0016] In an embodiment, there are two skeletons. The two skeletons are arranged at intervals along the short-axis side and are symmetrically arranged. Each skeleton is correspondingly connected to one end of the two voice coils.

[0017] In one embodiment, the framework includes a first connecting portion, a plurality of connecting arms, and a plurality of second connecting portions. The first connecting portion is connected to the diaphragm. The plurality of connecting arms and the plurality of second connecting portions are both located inside the first connecting portion. One ends of the plurality of connecting arms are all connected to the first connecting portion and are arranged at intervals. At least one second connecting portion is connected to an end of the connecting arm far from the first connecting portion;

[0018] Wherein, the plurality of connecting arms extend into the magnetic gap through the avoidance notch, so that the second connecting portion is connected to the voice coil.

[0019] In one embodiment, the diaphragm includes an inner ring portion, a first folding ring disposed around the inner ring portion, a flat portion disposed around the first folding ring, a second folding ring disposed around the flat portion, and a fixing portion connected to the outside of the second folding ring. The fixing portion is connected to the housing. The flat portion is connected to the framework. The inner ring portion forms the inner ring hole.

[0020] In one embodiment, the inner ring portion, the first folding ring, the flat portion, the second folding ring, and the fixing portion are an integrally formed structure;

[0021] And / or, the protruding direction of the first folding ring is the same as or opposite to the protruding direction of the second folding ring;

[0022] And / or, the diaphragm further includes a reinforcing portion, and the reinforcing portion is disposed between the flat portion and the framework.

[0023] In one embodiment, the sound generating device further includes a support member. The support member is a ring structure. The support member surrounds the magnetic circuit system and is disposed on a side of the diaphragm far from the framework. The outer ring of the diaphragm is connected to the housing, and the inner ring of the diaphragm is connected to the support member;

[0024] And / or, the outer magnetic group includes a first portion disposed on two sides of the two central magnetic groups along the extending direction of the long axis side and a second portion disposed on two sides of the two central magnetic groups along the extending direction perpendicular to the short axis side. An avoidance notch is formed between the first portion and the second portion and between the second portion and the common magnetic group;

[0025] And / or, the housing is provided with a sound outlet hole. The diaphragm divides the installation cavity on the periphery of the magnetic circuit system into a front cavity and a rear cavity. The front cavity is communicated with the sound outlet hole, and the rear cavity is communicated with the magnetic gap.

[0026] The present utility model further provides an electronic device, and the electronic device includes the above-mentioned sound generating device.

[0027] The sound generating device of the technical solution of the present utility model sets the magnetic circuit system as a magnetic yoke and a central magnetic part and an edge magnetic part arranged on the magnetic yoke. By setting the central magnetic part as two central magnetic groups arranged at intervals, and setting the edge magnetic part as an outer magnetic group located outside the two central magnetic groups and a common magnetic group located between the two central magnetic groups, so that the outer magnetic group and the common magnetic group of the edge magnetic part are both spaced from each central magnetic group, to enclose and form two magnetic gaps arranged at intervals, and respectively arrange the two voice coils of the vibration system corresponding to the two magnetic gaps. Thus, when current is passed through the two voice coils, the two voice coils vibrate respectively in the magnetic fields of the two magnetic gaps formed by the magnetic circuit system and drive the diaphragm to vibrate and generate sound; at the same time, by setting each central magnetic group as a first central magnet, a central magnetic guide plate and a second central magnet arranged in a stacked manner, and setting both the outer magnetic group and the common magnetic group as a first edge magnet, an edge magnetic guide plate and a second edge magnet arranged in a stacked manner, so that the first central magnet, the central magnetic guide plate and the second central magnet of the two central magnetic groups respectively correspond to the first edge magnet, the edge magnetic guide plate and the second edge magnet of the outer magnetic group and the common magnetic group of the edge magnetic part in the direction perpendicular to the vibration direction of the vibration system. Thus, the two central magnetic groups of the central magnetic part jointly share the common magnetic group of the edge magnetic part and form two magnetic gaps, so that the two voice coils can make full use of the magnetic field of the central magnetic part, improve the magnetic energy utilization rate of the central magnetic part, and thus improve the loudness and sensitivity of the sound generating device, so as to improve the product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0029] Figure 1 It is a schematic cross-sectional view of an embodiment of the sound generating device provided by the present utility model;

[0030] Figure 2 It is an exploded schematic view of an embodiment of the sound generating device provided by the present utility model;

[0031] Figure 3 It is a schematic cross-sectional view of an embodiment of the magnetic circuit system provided by the present utility model;

[0032] Figure 4 It is an exploded schematic view of an embodiment of the magnetic circuit system provided by the present utility model;

[0033] Figure 5 It is a schematic structural view of an embodiment of the skeleton provided by the present utility model.

[0034] Explanation of the reference numerals in the drawings:

[0035] 100, Sound generating device; 1, Housing; 11, Installation cavity; 12, First through hole; 13, Second through hole; 14, Support member; 15, First housing; 16, Second housing; 2, Magnetic circuit system; 21, Magnetic yoke; 211, First magnetic yoke; 212, Second magnetic yoke; 22, Central magnetic part; 221, Central magnetic group; 2211, First central magnet; 2212, Central magnetic guide plate; 2213, Second central magnet; 23, Edge magnetic part; 231, Outer magnetic group; 2311, Avoidance notch; 232, Shared magnetic group; 2321, First edge magnet; 2322, Edge magnetic guide plate; 2323, Second edge magnet; 24, Magnetic gap; 3, Vibration system; 31, Diaphragm; 311, Inner ring part; 312, Inner ring hole; 313, First folding ring; 314, Straight part; 315, Second folding ring; 316, Fixed part; 317, Reinforcement part; 32, Voice coil; 33, Skeleton; 331, First connecting part; 332, Connecting arm; 333, Second connecting part.

[0036] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0038] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0039] At the same time, the meaning of "and / or" or "and also / or" that appears throughout the text is to include three solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously.

[0040] In addition, in the present utility model, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0041] In recent years, convenient electronic devices (such as mobile phones, earphones, computers) have penetrated into people's daily lives. With the rapid development of technology, the penetration rate of speakers is getting higher and higher, and people's demand for the sound quality of electronic devices is also increasing. The full-frequency and miniaturization of speakers have become the mainstream demands. At the same time, people's requirements for speakers are not limited to the playback of video and audio. There are even higher requirements for the sound quality and reliability of the sound played by speakers, and speakers are directly related to the quality of the played sound and the stability of the product.

[0042] In the related art, the micro speakers used in electronic devices such as tablets and laptops are usually large in size, and the existing large-size and ultra-thin speakers usually adopt a single voice coil scheme, resulting in a low utilization rate of the magnetic energy in the middle area of the central magnet in the magnetic circuit system, which fails to be effectively utilized, thus affecting the loudness and sensitivity of the micro speakers. The loudness of micro speakers generally cannot meet the requirements. Therefore, further improving the utilization rate of magnets and enhancing the sensitivity of speakers is an important task.

[0043] Based on the above concepts and problems, the present utility model proposes a sound generating device 100. It can be understood that the sound generating device 100 can be applied to electronic devices, and the electronic devices can be smart watches, mobile phones, tablets, computers, earphones, etc., which are not limited herein.

[0044] Please refer to Figures 1 to 5As shown, in the embodiment of the present utility model, 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 part 22 and a side magnetic part 23 provided on the magnetic yoke 21. The central magnetic part 22 includes two central magnetic groups 221 arranged at intervals. The side magnetic part 23 includes an outer magnetic group 231 located outside the two central magnetic groups 221 and a shared magnetic group 232 located between the two central magnetic groups 221. The outer magnetic group 231 and the shared magnetic group 232 are both spaced from each central magnetic group 221 to enclose two spaced magnetic gaps 24. Each central magnetic group 221 includes a first central magnet 2211, a central magnetic guide plate 2212 and a second central magnet 2213 stacked together. The outer magnetic group 231 and the shared magnetic group 232 both include a first side magnet 2321, a side magnetic guide plate 2322 and a second side magnet 2323 stacked together. The vibration system 3 includes a diaphragm 31 and two voice coils 32 connected to the diaphragm 31. Each voice coil 32 is arranged corresponding to a magnetic gap 24. Among them, the first central magnet 2211, the central magnetic guide plate 2212 and the second central magnet 2213 respectively correspond to the first side magnet 2321, the side magnetic guide plate 2322 and the second side magnet 2323 in the direction perpendicular to the vibration direction of the vibration system 3 one by one.

[0045] In this embodiment, the sound generating device 100 is a micro speaker. It should be noted that the magnetic circuit system 2 of the sound generating device 100 and the diaphragm 31 of the vibration system 3 are arranged opposite to each other. Of course, in other embodiments, the diaphragm 31 of the vibration system 3 can also be arranged on the outer periphery of the magnetic circuit system 2, which is not limited herein.

[0046] Optionally, the magnetic circuit system 2 can be arranged in a square shape. For example, the magnetic circuit system 2 can include a central magnetic part 22 and a side magnetic part 23 both having a square structure. The vibration system 3 is optionally arranged in a square shape. It can be understood that the periphery of the diaphragm 31 of the vibration system 3 can be connected to the magnetic circuit system 2, or the magnetic circuit system 2 and the vibration system 3 can be respectively assembled on an outer shell or a module housing, etc., which is not limited herein.

[0047] For better assembly of the magnetic circuit system 2 and the vibration system 3 of the sound generating device 100. In one embodiment, as Figure 1 and Figure 2 shown, the sound generating device 100 further includes an outer shell 1, and the magnetic circuit system 2 and the vibration system 3 are housed in the outer shell 1.

[0048] In this embodiment, the outer shell 1 is used to install, fix and support components such as the magnetic circuit system 2 and the vibration system 3. That is, the outer shell 1 provides an installation foundation for components such as the magnetic circuit system 2 and the vibration system 3. It can be understood that the outer shell 1 can be a whole structure or formed by a combination of multiple split structures, which is not limited herein.

[0049] Optionally, the housing 1 can be a box or a frame structure, that is, the housing 1 has a cavity with openings at both ends. The magnetic circuit system 2 and the vibration system 3 are respectively connected to both sides of the housing 1, so that the magnetic circuit system 2, the housing 1 and the diaphragm 31 of the vibration system 3 enclose a vibration cavity.

[0050] In this embodiment, the housing 1 can be a BOX structure, that is, the housing 1 has an installation cavity 11, and both the magnetic circuit system 2 and the vibration system 3 are arranged in the installation cavity 11. It can be understood that the periphery of the diaphragm 31 of the vibration system 3 is connected to the housing 1 and is relatively and spaced apart from the magnetic circuit system 2; or, the periphery of the diaphragm 31 of the vibration system 3 is connected to the housing 1, the center of the diaphragm 31 is connected to the central magnetic part 22 of the magnetic circuit system 2 and is opposite to the magnetic circuit system 2; or, the periphery of the diaphragm 31 of the vibration system 3 is connected to the housing 1, and a through-hole structure for the magnetic circuit system 2 to pass through is provided in the center of the diaphragm 31. At this time, the center of the diaphragm 31 is connected to the side magnetic part 23 of the magnetic circuit system 2 or the support member 14 on the housing 1, which is not limited here.

[0051] It can be understood that the sound generating device 100 is applied to an electronic device, that is, the sound generating device 100 can be installed on the electronic device through the housing 1. It should be noted that the housing 1 of the sound generating device 100 can be an independent housing or box structure of the electronic device. At this time, the components such as the magnetic circuit system 2 and the vibration system 3 of the sound generating device 100 are integrated into a whole structure, which is convenient for disassembly and assembly. Of course, the housing 1 of the sound generating device 100 can also be integrally formed with the housing or box structure of the electronic device. In this way, the structural strength and sealing performance can be effectively improved, and at the same time, the size of the electronic device can be reduced.

[0052] In this embodiment, the housing 1 is used to house and fix the vibration system 3, the magnetic circuit system 2 and other structures, so that the sound generating device 100 can be applied to an electronic device as an independent component.

[0053] It can be understood that by setting the magnetic circuit system 2 as a magnetic yoke 21 and a central magnetic part 22 and a side magnetic part 23 provided on the magnetic yoke 21, the magnetic circuit system 2 can be connected to the housing 1 through the magnetic yoke 21; or, the magnetic circuit system 2 can be connected to the housing 1 through the side magnetic part 23, which is not limited herein. In this embodiment, by setting the central magnetic part 22 as two central magnetic groups 221 arranged at intervals, and setting the side magnetic part 23 as an outer magnetic group 231 located outside the two central magnetic groups 221 and a common magnetic group 232 located between the two central magnetic groups 221, the outer magnetic group 231 and the common magnetic group 232 of the side magnetic part 23 are cooperatively arranged on the periphery of the two central magnetic groups 221, and the outer magnetic group 231 and the common magnetic group 232 of the side magnetic part 23 are both spaced from each central magnetic group 221, so that two magnet gaps 24 arranged at intervals are formed in this way, that is, the two magnet gaps 24 are located on the opposite sides of the common magnetic group 232, and each magnet gap 24 is arranged around a central magnetic group 221, so that the diaphragm 31 of the vibration system 3 is connected to the housing 1, and thus one end of the two voice coils 32 is connected to the diaphragm 31, and the other ends of the two voice coils 32 are respectively arranged corresponding to the two magnet gaps 24.

[0054] In order to realize the electrical connection between the two voice coils 32 and an external circuit. In an embodiment, the vibration system 3 further includes a centering washer or a connecting member or a skeleton 33. One end of the centering washer or the connecting member or the skeleton 33 is connected to the two voice coils 32 and is connected and conducted with the leads of the two voice coils 32, and the other end of the centering washer or the connecting member or the skeleton 33 is connected to the housing 1.

[0055] It can be understood that taking the centering washer as an example, the two ends of the centering washer are respectively electrically connected to the lead of the voice coil 32 and an external circuit. In this embodiment, the centering washer can be arranged at the bottom of the voice coil 32, and the centering washer is located at the four corner positions of the sound generating device 100 or in the short axis or long axis direction of the sound generating device 100. Of course, the centering washer can also be arranged at the top of the voice coil 32, and the centering washer is located between the voice coil 32 and the diaphragm 31, which is not limited herein.

[0056] In this embodiment, each central magnetic group 221 of the central magnetic part 22 is set as the first central magnet 2211, the central magnetic guide plate 2212 and the second central magnet 2213 which are stacked, and the outer magnetic group 231 and the common magnetic group 232 of the edge magnetic part 23 are both set as the first edge magnet 2321, the edge magnetic guide plate 2322 and the second edge magnet 2323 which are stacked, so that the first central magnet 2211, the central magnetic guide plate 2212 and the second central magnet 2213 of the central magnetic group 221 respectively correspond to the first edge magnet 2321, the edge magnetic guide plate 2322 and the second edge magnet 2323 of the outer magnetic group 231 and the common magnetic group 232 one by one in the direction perpendicular to the vibration direction of the vibration system 3. In this way, the common magnetic group 232 of the edge magnetic part 23 is jointly shared by the two central magnetic groups 221 of the central magnetic part 22, and two magnetic gaps 24 are formed, so that the two voice coils 32 can make full use of the magnetic field of the central magnetic part 22, improve the magnetic energy utilization rate of the central magnetic part 22, and thus improve the loudness and sensitivity of the sound generating device 100 to improve the product performance.

[0057] In one embodiment, the diaphragm 31 has two long axis sides and two short axis sides connected end to end, and the two central magnetic groups 221 are arranged at intervals along the direction of the long axis side.

[0058] In this embodiment, as Figure 2 shown, the diaphragm 31 is optionally rectangular, that is, the diaphragm 31 has two long axis sides and two short axis sides connected end to end. Optionally, the two central magnetic groups 221 of the central magnetic part 22 are arranged at intervals along the direction of the long axis side, that is, the two magnetic gaps 24 of the magnetic circuit system 2 are arranged at intervals along the direction of the long axis side, so that the two voice coils 32 are arranged at intervals along the direction of the long axis side.

[0059] In one embodiment, as Figure 2 and Figure 4 shown, the outer magnetic group 231 of the edge magnetic part 23 includes a plurality of them, and the plurality of outer magnetic groups 231 are arranged around the outside of the two central magnetic groups 221 of the central magnetic part 22, and gaps are formed between adjacent outer magnetic groups 231.

[0060] It can be understood that each of the plurality of outer magnetic groups 231 includes the first edge magnet 2321, the edge magnetic guide plate 2322 and the second edge magnet 2323 which are stacked. At this time, gaps are formed between adjacent first edge magnets 2321 in adjacent outer magnetic groups 231, gaps are formed between adjacent edge magnetic guide plates 2322, and gaps are formed between adjacent second edge magnets 2323, so that the plurality of outer magnetic groups 231 are spaced and surrounded to form an annular structure with gaps, which is not limited here. Optionally, the gap formed between adjacent outer magnetic groups 231 is an avoidance notch 2311.

[0061] In this embodiment, the first-side magnets 2321 and second-side magnets 2323 of the outer magnetic group 231 and the common magnetic group 232 can be selected as permanent magnets. It can be understood that the first-side magnets 2321, side magnetic conduction plates 2322, and second-side magnets 2323 of the outer magnetic group 231 and the common magnetic group 232 are stacked along the moving direction of the voice coil 32. That is, the first-side magnets 2321 and / or the second-side magnets 2323 are connected to the magnetic yoke 21, the side magnetic conduction plates 2322 are stacked between the first-side magnets 2321 and the second-side magnets 2323, and the second-side magnets 2323 are stacked on the side of the side magnetic conduction plates 2322 facing away from the first-side magnets 2321.

[0062] Optionally, the first central magnets 2211, central magnetic conduction plates 2212, and second central magnets 2213 of the two central magnetic groups 221 are all in the shape of square plates, which is not limited herein. The first central magnets 2211 and the second central magnets 2213 can be selected as permanent magnets. The first central magnets 2211, central magnetic conduction plates 2212, and second central magnets 2213 of the two central magnetic groups 221 are all stacked along the moving direction of the voice coil 32, which is not limited herein.

[0063] The sound generating device 100 of the present utility model sets the magnetic circuit system 2 as a magnetic yoke 21, a central magnetic part 22 and a side magnetic part 23 arranged on the magnetic yoke 21. By setting the central magnetic part 22 as two central magnetic groups 221 arranged at intervals, and setting the side magnetic part 23 as an outer magnetic group 231 located outside the two central magnetic groups 221 and a common magnetic group 232 located between the two central magnetic groups 221, the outer magnetic group 231 and the common magnetic group 232 of the side magnetic part 23 are both spaced from each central magnetic group 221, so as to enclose and form two magnetic gaps 24 arranged at intervals. The two voice coils 32 of the vibration system 3 are respectively arranged corresponding to the two magnetic gaps 24. Thus, when currents are passed through the two voice coils 32, the two voice coils 32 vibrate respectively in the magnetic fields of the two magnetic gaps 24 formed by the magnetic circuit system 2 and drive the diaphragm 31 to vibrate and generate sound. At the same time, by setting each central magnetic group 221 as a first central magnet 2211, a central magnetic guide plate 2212 and a second central magnet 2213 arranged in layers, and setting both the outer magnetic group 231 and the common magnetic group 232 as a first side magnet 2321, a side magnetic guide plate 2322 and a second side magnet 2323 arranged in layers, the first central magnet 2211, the central magnetic guide plate 2212 and the second central magnet 2213 of the two central magnetic groups 221 respectively correspond to the first side magnet 2321, the side magnetic guide plate 2322 and the second side magnet 2323 of the outer magnetic group 231 and the common magnetic group 232 of the side magnetic part 23 in the vibration direction perpendicular to the vibration system 3. Thus, the two central magnetic groups 221 of the central magnetic part 22 jointly share the common magnetic group 232 of the side magnetic part 23 and form two magnetic gaps 24, so that the two voice coils 32 can make full use of the magnetic field of the central magnetic part 22, improve the magnetic energy utilization rate of the central magnetic part 22, and thus improve the loudness and sensitivity of the sound generating device 100, so as to improve the product performance.

[0064] In an embodiment, both the first central magnet 2211 and the second central magnet 2213 are magnetized along the vibration direction of the vibration system 3, and the magnetic poles of the first central magnet 2211 and the second central magnet 2213 close to the central magnetic guide plate 2212 are the same; both the first side magnet 2321 and the second side magnet 2323 are magnetized along the vibration direction of the vibration system 3, and the magnetic poles of the first side magnet 2321 and the second side magnet 2323 close to the side magnetic guide plate 2322 are the same; the magnetic poles of the first central magnet 2211 and the second central magnet 2213 close to the central magnetic guide plate 2212 are opposite to the magnetic poles of the first side magnet 2321 and the second side magnet 2323 close to the side magnetic guide plate 2322.

[0065] In this embodiment, as Figure 1 and Figure 3As shown, the vibration direction of the vibration system 3 can be selected as the vertical direction. Optionally, the first side magnets 2321 and the second side magnets 2323 of the outer magnetic group 231 and the common magnetic group 232 are magnetized along the vertical direction, and the first central magnets 2211 and the second central magnets 2213 of the two central magnetic groups 221 are magnetized along the vertical direction.

[0066] It should be noted that Figure 3 The arrow direction in the magnetic circuit system 2 shown is the direction from the S pole to the N pole, that is, the magnetization direction. The first central magnets 2211 and the second central magnets 2213 of the two central magnetic groups 221 are magnetized along the vertical direction and in opposite directions; the first side magnets 2321 and the second side magnets 2323 of the outer magnetic group 231 and the common magnetic group 232 are magnetized along the vertical direction and in opposite directions. It can be understood that such a setting can make the central magnetic part 22 and the side magnetic part 23 form a magnetic circuit passing through the voice coil 32 in the magnetic gap 24.

[0067] It can be understood that the magnetization direction of the first central magnet 2211 is opposite to that of the second central magnet 2213. In this way, the magnetic induction lines of the first central magnet 2211 and the second central magnet 2213 of the central magnetic part 22 gather at the central magnetic conduction plate 2212, and a magnetic field with a strong magnetic field intensity is generated by the central magnetic part 22 and passes through the magnetic gap 24, thereby increasing the density of the magnetic flux in the magnetic gap 24, increasing the number of magnetic force lines passing through the voice coil 32, increasing the magnetic force received by the voice coil 32, and effectively improving the BL value. At the same time, the magnetization direction of the first side magnet 2321 is opposite to that of the second side magnet 2323. In this way, the magnetic induction lines of the first side magnet 2321 and the second side magnet 2323 of the side magnetic part 23 gather at the side magnetic conduction plate 2322, and a magnetic field with a strong magnetic field intensity is generated by the side magnetic part 23 and passes through the magnetic gap 24, thereby increasing the density of the magnetic flux in the magnetic gap 24, increasing the number of magnetic force lines passing through the voice coil 32, increasing the magnetic force received by the voice coil 32, and effectively improving the BL value.

[0068] In this embodiment, when the first central magnet 2211 is magnetized from top to bottom, the second central magnet 2213 is magnetized from bottom to top, the first side magnet 2321 is magnetized from bottom to top, and the second side magnet 2323 is magnetized from top to bottom, that is, the N pole of the first central magnet 2211 is at the bottom and the S pole is at the top, the N pole of the second central magnet 2213 is at the top and the S pole is at the bottom, the N pole of the first side magnet 2321 is at the top and the S pole is at the bottom, and the N pole of the second side magnet 2323 is at the bottom and the S pole is at the top, and vice versa.

[0069] It can be understood that the magnetic poles of the first central magnet 2211 and the second central magnet 2213 close to the central magnetic conduction plate 2212 are the same, that is, the magnetic poles of the first central magnet 2211 and the second central magnet 2213 close to the central magnetic conduction plate 2212 are both N poles or S poles. The magnetic poles of the first side magnet 2321 and the second side magnet 2323 close to the side magnetic conduction plate 2223 are the same, that is, the magnetic poles of the first side magnet 2321 and the second side magnet 2323 close to the side magnetic conduction plate 2223 are both S poles or N poles. In this embodiment, when the magnetic poles of the first central magnet 2211 and the second central magnet 2213 close to the central magnetic conduction plate 2212 are both N poles, the magnetic poles of the first side magnet 2321 and the second side magnet 2323 close to the side magnetic conduction plate 2223 are both S poles, and vice versa. Such a setting can form a magnetic circuit passing through the voice coil 32 in the magnetic gap 24, which is not limited herein.

[0070] In an embodiment, there are multiple first central magnets 2211, and the multiple first central magnets 2211 are arranged adjacent to each other and are located between the central magnetic conduction plate 2212 and the magnetic conduction yoke 21; wherein, the multiple first central magnets 2211 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple first central magnets 2211 are the same.

[0071] Optionally, the multiple first central magnets 2211 are laid flat between the magnetic conduction yoke 21 and the central magnetic conduction plate 2212. The multiple first central magnets 2211 are magnetized along the vertical direction, and the magnetization directions of the multiple first central magnets 2211 are the same. That is, the multiple first central magnets 2211 are magnetized along the direction in which the voice coil 32 moves, and the multiple first central magnets 2211 are magnetized upward or downward simultaneously, which is not limited herein.

[0072] In an embodiment, there are multiple second central magnets 2213, and the multiple second central magnets 2213 are arranged adjacent to each other and are located on the side of the central magnetic conduction plate 2212 facing away from the first central magnet 2211; wherein, the multiple second central magnets 2213 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple second central magnets 2213 are the same.

[0073] Optionally, the multiple second central magnets 2213 are laid flat on the side of the central magnetic conduction plate 2212 facing away from the first central magnet 2211. The multiple second central magnets 2213 are magnetized along the vertical direction, and the magnetization directions of the multiple second central magnets 2213 are the same. That is, the multiple second central magnets 2213 are magnetized along the direction in which the voice coil 32 moves, and the multiple second central magnets 2213 are magnetized upward or downward simultaneously, which is not limited herein.

[0074] In one embodiment, the first side magnets 2321 include multiple ones, which are arranged adjacent to each other and are located between the side magnetic conduction plate 2322 and the magnetic yoke 21. Among them, all the multiple first side magnets 2321 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple first side magnets 2321 are the same.

[0075] Optionally, the multiple first side magnets 2321 are laid flat between the magnetic yoke 21 and the side magnetic conduction plate 2322. All the multiple first side magnets 2321 are magnetized along the vertical direction, and the magnetization directions of the multiple first side magnets 2321 are the same. That is, all the multiple first side magnets 2321 are magnetized along the direction in which the voice coil 32 moves. The multiple first side magnets 2321 are magnetized upward or downward simultaneously, and no limitation is made here.

[0076] In one embodiment, the second side magnets 2323 include multiple ones, which are arranged adjacent to each other and are located on the side of the side magnetic conduction plate 2322 opposite to the first side magnets 2321. Among them, all the multiple second side magnets 2323 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple second side magnets 2323 are the same.

[0077] Optionally, the multiple second side magnets 2323 are laid flat on the side of the side magnetic conduction plate 2322 opposite to the first side magnets 2321. All the multiple second side magnets 2323 are magnetized along the vertical direction, and the magnetization directions of the multiple second side magnets 2323 are the same. That is, all the multiple second side magnets 2323 are magnetized along the direction in which the voice coil 32 moves. The multiple second side magnets 2323 are magnetized upward or downward simultaneously, and no limitation is made here.

[0078] In one embodiment, at least a part of the projection of the side magnetic conduction plate 2322 in the direction perpendicular to the vibration direction of the vibration system 3 coincides with the projection of the voice coil 32 in the direction perpendicular to the vibration direction of the vibration system 3. It can be understood that, with such a setting, the magnetic induction lines of the first side magnets 2321 and the second side magnets 2323 of the side magnetic part 23 gather on the side magnetic conduction plate 2322 and pass through the magnetic gap 24, thereby increasing the density of the magnetic flux in the magnetic gap 24, making the voice coil 32 in a relatively reasonable magnetic field, so as to alleviate the distortion of the audio output by the sound generating device 100 and improve the sound quality of the audio output by the sound generating device 100. Optionally, the projection of the side magnetic conduction plate 2322 in the horizontal direction is located within the projection of the voice coil 32 in the horizontal direction.

[0079] Optionally, the thickness of the side magnetic conduction plate 2322 is less than or equal to the thickness of the first side magnets 2321, and the thickness of the side magnetic conduction plate 2322 is less than or equal to the thickness of the second side magnets 2323, and no limitation is made here.

[0080] In one embodiment, at least a part of the central magnetic guide plate 2212 coincides with the projection of the voice coil 32 along the vibration direction perpendicular to the vibration direction of the vibration system 3. It can be understood that such a setting makes the magnetic induction lines of the first central magnet 2211 and the second central magnet 2213 of the central magnetic part 22 gather on the central magnetic guide plate 2212 and pass through the magnetic gap 24, thereby increasing the density of the magnetic flux in the magnetic gap 24, making the voice coil 32 in a relatively reasonable magnetic field, so as to alleviate the distortion of the audio output by the sound generating device 100 and improve the sound quality of the audio output by the sound generating device 100. Optionally, the projection of the central magnetic guide plate 2212 in the horizontal direction is located within the projection of the voice coil 32 in the horizontal direction.

[0081] Optionally, the thickness of the central magnetic guide plate 2212 is less than or equal to the thickness of the first central magnet 2211, and the thickness of the central magnetic guide plate 2212 is less than or equal to the thickness of the second central magnet 2213, and no limitation is made here. In this embodiment, the thickness of the central magnetic guide plate 2212 is optionally equivalent to the thickness of the side magnetic guide plate 2322.

[0082] In this embodiment, as Figure 1 and Figure 3 shown, the thickness of the first central magnet 2211 along the vibration direction of the vibration system 3 is optionally the same as the thickness of the first side magnet 2321 along the vibration direction of the vibration system 3. Optionally, the thickness of the second central magnet 2213 along the vibration direction of the vibration system 3 is the same as the thickness of the second side magnet 2323 along the vibration direction of the vibration system 3. Optionally, the thickness of the central magnetic guide plate 2212 along the vibration direction of the vibration system 3 is the same as the thickness of the side magnetic guide plate 2322 along the vibration direction of the vibration system 3. Such a setting can ensure that the forces generated to drive the voice coil 32 are equivalent, thereby improving the smoothness of the vibration of the voice coil 32.

[0083] In one embodiment, the sound generating device 100 further includes a housing 1, and the housing 1 is provided with an installation cavity 11, and the magnetic circuit system 2 and the vibration system 3 are arranged in the installation cavity 11.

[0084] In this embodiment, as Figure 1 and Figure 2 shown, the housing 1 includes a first housing body 15 and a second housing body 16, and the first housing body 15 and the second housing body 16 enclose to form the installation cavity 11. It can be understood that the first housing body 15 and / or the second housing body 16 includes a bottom plate and side plates provided at the periphery of the bottom plate, such that the side plates and the bottom plate enclose to form a receiving cavity with one end open. At this time, the first housing body 15 and the second housing body 16 are joined and connected to cover the opening and enclose to form the installation cavity 11.

[0085] It can be understood that the magnetic circuit system 2 is disposed between the first housing 15 and the second housing 16, and the periphery of the diaphragm 31 of the vibration system 3 is connected to the first housing 15 and / or the second housing 16. Optionally, the first yoke 211 and the second yoke 212 of the magnetic yoke 21 of the magnetic circuit system 2 are respectively connected to the bottom plates of the first housing 15 and the second housing 16. At this time, a through-hole structure for the magnetic circuit system 2 to pass through is provided at the center of the diaphragm 31. The periphery of the diaphragm 31 is connected to the outer housing 1, and the center of the diaphragm 31 is connected to the magnetic circuit system 2 or the outer housing 1, which is not limited herein.

[0086] In an embodiment, the magnetic yoke 21 includes a first yoke 211 and a second yoke 212 disposed opposite to each other. The central magnetic part 22 and the side magnetic part 23 are both disposed between the first yoke 211 and the second yoke 212. The first side magnet 2321 and the first central magnet 2211 are both connected to the first yoke 211, and the second side magnet 2323 and the second central magnet 2213 are connected to the second yoke 212.

[0087] In this embodiment, as Figure 1 and Figure 2 shown, by setting the magnetic yoke 21 as the first yoke 211 and the second yoke 212 disposed opposite to each other, an installation space is formed between the first yoke 211 and the second yoke 212. At this time, the central magnetic part 22 and the side magnetic part 23 are disposed between the first yoke 211 and the second yoke 212, that is, the first central magnet 2211 of the central magnetic part 22 and the first side magnet 2321 of the side magnetic part 23 are connected to the first yoke 211, and the second central magnet 2213 of the central magnetic part 22 and the second side magnet 2323 of the side magnetic part 23 are connected to the second yoke 212.

[0088] It can be understood that in this way, the magnetic induction lines generated by the central magnetic part 22 and the magnetic induction lines generated by the side magnetic part 23 can effectively form a magnetic circuit passing through the voice coil 32 in the magnetic gap 24, effectively increasing the density of the magnetic flux in the magnetic gap 24, so that the voice coil 32 is in a relatively reasonable magnetic field, so as to alleviate the distortion of the audio output by the sound generating device 100 and improve the sound quality of the audio output by the sound generating device 100.

[0089] In an embodiment, the outer housing 1 is further provided with a first through-hole 12 and a second through-hole 13 communicating with the installation cavity 11. The first yoke 211 is connected to the outer housing 1 and is located in the first through-hole 12, and the second yoke 212 is connected to the outer housing 1 and is located in the second through-hole 13.

[0090] In this embodiment, as Figure 1 and Figure 2As shown, both the first housing 15 and the second housing 16 include a bottom plate and side plates provided at the periphery of the bottom plate. The bottom plates of the first housing 15 and the second housing 16 are respectively provided with a first through hole 12 and a second through hole 13 corresponding to the first magnetic yoke 211 and the second magnetic yoke 212 of the magnetic yoke 21, that is, the bottom plate of the first housing 15 is provided with the first through hole 12, and the bottom plate of the second housing 16 is provided with the second through hole 13.

[0091] It can be understood that the first magnetic yoke 211 of the magnetic yoke 21 is connected to the first housing 15 of the outer housing 1 and is located within the first through hole 12, and the second magnetic yoke 212 of the magnetic yoke 21 is connected to the second housing 16 of the outer housing 1 and is located within the second through hole 13. Optionally, the periphery of the diaphragm 31 is clamped between the first housing 15 and the second housing 16.

[0092] In one embodiment, the diaphragm 31 has an inner ring hole 312. The diaphragm 31 is wound around the outside of the magnetic circuit system 2, and in the vibration direction of the vibration system 3, the two side surfaces of the diaphragm 31 do not extend beyond the two side surfaces of the magnetic circuit system 2. The magnetic circuit system 2 is provided with an avoidance notch 2311 communicating with each magnetic gap 24. The vibration system 3 further includes a skeleton 33. One end of the skeleton 33 is connected to the diaphragm 31, and the other end of the skeleton 33 passes through the avoidance notch 2311 and is connected to each voice coil 32.

[0093] It can be understood that by setting the diaphragm 31 as an annular diaphragm, the magnetic circuit system 2 is passed through the inner ring hole 312, so that the overall thickness of the product can be reduced.

[0094] In this embodiment, as Figure 1 、 Figure 2 and Figure 5 shown, by providing the skeleton 33, both voice coils 32 are connected to the diaphragm 31 through the skeleton 33, so that the two voice coils 32 can be ensured to be in a relatively reasonable magnetic field, that is, the region with the largest magnetic flux density, thereby effectively increasing the BL value.

[0095] Optionally, the outer magnetic group 231 of the magnetic circuit system 2 is provided with an avoidance notch 2311, and the avoidance notch 2311 communicates with the magnetic gap 24, so as to facilitate the skeleton 33 to pass through the avoidance notch 2311 and be connected to the voice coil 32.

[0096] In one embodiment, the skeleton 33 includes a first connecting portion 331, a connecting arm 332 and a second connecting portion 333. The two ends of the connecting arm 332 are respectively connected to the first connecting portion 331 and the second connecting portion 333. The first connecting portion 331 is connected to the diaphragm 31, and the connecting arm 332 passes through the avoidance notch 2311 so that the second connecting portion 333 is connected to the voice coil 32.

[0097] It can be understood that when there is one skeleton 33, the skeleton 33 includes a first connecting portion 331, a plurality of connecting arms 332 and a plurality of second connecting portions 333. Optionally, the first connecting portion 331 is arranged in a ring shape and is connected to the diaphragm 31. The plurality of connecting arms 332 and the plurality of second connecting portions 333 are both located inside the first connecting portion 331. One ends of the plurality of connecting arms 332 are all connected to the first connecting portion 331 and are arranged at intervals. At least one second connecting portion 333 is connected to the end of the connecting arm 332 far from the first connecting portion 331. Among them, at least one connecting arm 332 extends into a magnetic gap 24 through an avoidance notch 2311, so that at least one second connecting portion 333 is connected to a voice coil 32.

[0098] Optionally, the first connecting portion 331 is arranged in a rectangular ring shape, and there are four connecting arms 332. The four connecting arms 332 are respectively arranged corresponding to the four corner positions of the first connecting portion 331.

[0099] Of course, there can also be multiple skeletons 33, for example, there are two or four skeletons 33. In an embodiment, as Figure 2 and Figure 5 shown, there are two skeletons 33. The diaphragm 31 has two long axis sides and two short axis sides connected end to end. The two skeletons 33 are arranged at intervals along the short axis side and are symmetrically arranged. Each skeleton 33 is correspondingly connected to one end of two voice coils 32.

[0100] Optionally, the two skeletons 33 can be arranged at intervals along the long axis side or the short axis side of the diaphragm 31 and are symmetrically arranged.

[0101] In an embodiment, when the two skeletons 33 are arranged at intervals along the short axis side and are symmetrically arranged, that is, the two skeletons 33 are respectively arranged corresponding to the two long axis sides of the diaphragm 31. At this time, each skeleton 33 is correspondingly connected to one end of two voice coils 32.

[0102] In this embodiment, the skeleton 33 includes a first connecting portion 331, a plurality of connecting arms 332 and a plurality of second connecting portions 333. The first connecting portion 331 is connected to the diaphragm 31. The plurality of connecting arms 332 and the plurality of second connecting portions 333 are both located inside the first connecting portion 331. One ends of the plurality of connecting arms 332 are all connected to the first connecting portion 331 and are arranged at intervals. At least one second connecting portion 333 is connected to the end of the connecting arm 332 far from the first connecting portion 331. Among them, the plurality of connecting arms 332 extend into the magnetic gap 24 through the avoidance notch 2311, so that the second connecting portion 333 is connected to the voice coil 32.

[0103] It can be understood that multiple connecting arms 332 of one skeleton 33 respectively pass through multiple avoiding gaps 2311 and extend into two magnetic gaps 24, and are respectively connected to one end of two voice coils 32 through second connecting parts 333; multiple connecting arms 332 of the other skeleton 33 respectively pass through multiple avoiding gaps 2311 and extend into two magnetic gaps 24, and are respectively connected to the other end of two voice coils 32 through second connecting parts 333.

[0104] In another embodiment, when the two skeletons 33 are arranged at intervals along the long axis side and are symmetrically arranged, that is, the two skeletons 33 are respectively arranged corresponding to the two short axis sides of the diaphragm 31, and at this time each skeleton 33 is correspondingly connected to one voice coil 32.

[0105] It can be understood that multiple connecting arms 332 of one skeleton 33 respectively pass through multiple avoiding gaps 2311 and extend into one magnetic gap 24, and are respectively connected to both ends of one voice coil 32 through second connecting parts 333; multiple connecting arms 332 of the other skeleton 33 respectively pass through multiple avoiding gaps 2311 and extend into the other magnetic gap 24, and are respectively connected to both ends of one voice coil 32 through second connecting parts 333.

[0106] In this embodiment, it can be that one skeleton 33 is connected to one voice coil 32. Of course, it can also be that one skeleton 33 is simultaneously connected to the same side of two voice coils 32.

[0107] Optionally, there are four skeletons 33, and the four skeletons 33 are respectively arranged corresponding to the four corner positions of the outer magnetic group 231. Or, there are eight skeletons 33, and each skeleton 33 is arranged corresponding to the corner position of one voice coil 32, which is not limited herein.

[0108] In one embodiment, the outer magnetic group 231 includes a first part arranged on both sides of the two central magnetic groups 221 along the extension direction of the long axis side of the diaphragm 31 and a second part arranged on both sides of the two central magnetic groups 221 along the extension direction of the short axis side of the diaphragm 31, and avoiding gaps 2311 are formed between the first part and the second part and between the second part and the common magnetic group 232.

[0109] In this embodiment, as Figure 2 and Figure 4 shown, the outer magnetic group 231 of the edge magnetic part 23 is optionally arranged in a rectangular frame shape, the outer magnetic group 231 has two long sides and two short sides, the two central magnetic groups 221 are arranged at intervals along the direction of the long side, the first part of the outer magnetic group 231 is two short sides, the second part of the outer magnetic group 231 is two long sides, the common magnetic group 232 is located between the two short sides and is parallel to the short sides and perpendicular to the long sides, so that the outer magnetic group 231 is separated into two rectangular cavities by the common magnetic group 232.

[0110] Optionally, an avoidance notch 2311 is provided at each corner position of the outer magnetic group 231, that is, an avoidance notch 2311 is provided between the long side and the short side. Of course, an avoidance notch 2311 may also be provided at the connection between the long side of the outer magnetic group 231 and the common magnetic group 232. Optionally, the number of connecting arms 332 of the skeleton 33 is the same as the number of avoidance notches 2311, and they are arranged in one-to-one correspondence, which is not limited here.

[0111] It can be understood that the leads of the two voice coils 32 can also be guided to the housing 1 through the skeleton 33 and connected to an external circuit for conduction. The skeleton 33 not only plays a role in connecting and fixing the voice coil 32, but also plays a role in avoiding problems such as the swing or polarization of the voice coil 32 during vibration.

[0112] In one embodiment, the diaphragm 31 includes an inner ring portion 311, a first folding ring 313 disposed around the inner ring portion 311, a flat portion 314 disposed around the first folding ring 313, a second folding ring 315 disposed around the flat portion 314, and a fixing portion 316 connected to the outside of the second folding ring 315. The fixing portion 316 is connected to the housing 1, the flat portion 314 is connected to the skeleton 33, and an inner ring hole 312 is formed in the inner ring portion 311.

[0113] In this embodiment, as Figure 1 and Figure 2 shown, the inner ring portion 311, the first folding ring 313, the flat portion 314, the second folding ring 315 and the fixing portion 316 of the diaphragm 31 can be selected to be an integrally formed structure, so as to ensure the vibration performance and structural strength of the diaphragm 31. Optionally, the magnetic circuit system 2 passes through the inner ring hole 312.

[0114] It can be understood that the first folding ring 313 and the second folding ring 315 of the diaphragm 31 are in a convex structure protruding upward or a concave structure recessed downward, which is not limited here. Optionally, the protruding direction of the first folding ring 313 is the same as or opposite to the protruding direction of the second folding ring 315. In this embodiment, the first folding ring 313 and the second folding ring 315 can protrude upward or downward simultaneously. Of course, in other embodiments, the first folding ring 313 and the second folding ring 315 can also protrude upward and the other protrude downward, which is not limited here.

[0115] In one embodiment, as Figure 1 and Figure 2 shown, the diaphragm 31 further includes a reinforcing portion 317, and the reinforcing portion 317 is disposed between the flat portion 314 and the skeleton 33. It can be understood that by providing the reinforcing portion 317, the structural strength of the diaphragm 31 can be effectively enhanced, thereby improving the connection stability of the voice coil 32 and avoiding problems such as tearing of the diaphragm 31 when the voice coil 32 drives the diaphragm 31 to vibrate.

[0116] In one embodiment, the sound generating device 100 further includes a support member 14. The support member 14 has an annular structure and surrounds the magnetic circuit system 2 and is disposed on the side of the diaphragm 31 away from the framework 33. The outer ring of the diaphragm 31 is connected to the housing 1, and the inner ring of the diaphragm 31 is connected to the support member 14.

[0117] In this embodiment, as Figure 1 and Figure 2 shown, by providing the support member 14, it is convenient to fix the central portion of the diaphragm 31 by using the support member 14, that is, the inner ring portion 311 of the diaphragm 31 is connected to the support member 14. It can be understood that the support member 14 protrudes from the bottom plate of the first housing 15 and / or the second housing 16. The support member 14 is adjacent to the magnetic circuit system 2.

[0118] Optionally, the support member 14 is annularly arranged and surrounds the magnetic circuit system 2. By disposing the support member 14 on the side of the diaphragm 31 away from the framework 33, the inner ring portion 311 is connected to the support member 14, so that the diaphragm 31 can be fixed, and the framework 33 and the two voice coils 32 can be supported and fixed.

[0119] In this embodiment, the diaphragm 31 divides the installation cavity on the circumferential side of the magnetic circuit system 2 into a front cavity and a rear cavity, that is, a front cavity is formed between the side of the diaphragm 31 away from the framework 33 and the housing 1, that is, a front cavity is formed between the diaphragm 31 and the first housing 15, and a rear cavity is formed between the side of the diaphragm 31 facing the framework 33 and the housing 1, that is, a rear cavity is formed between the diaphragm 31 and the second housing 16. It can be understood that in order to facilitate the sound generating device 100 to generate sound smoothly, the housing 1 is provided with a sound outlet hole communicating with the front cavity. By providing the support member 14, the diaphragm 31 can be effectively ensured to isolate the front cavity and the rear cavity. In order to ensure the air pressure balance between the front cavity and the rear cavity, the housing 1 is provided with an air vent hole communicating with the rear cavity, which is not limited herein.

[0120] The present utility model further provides an electronic device, and the electronic device includes the above-mentioned sound generating device 100. The specific structure of the sound generating device 100 refers to the foregoing embodiments. Since this electronic device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0121] In one embodiment, the electronic device further includes a device housing, and the device housing has an installation space, and the sound generating device 100 is disposed in the installation space of the device housing.

[0122] In this embodiment, the electronic device further includes a flexible circuit board. One end of the flexible circuit board is electrically connected to the sound generating device 100, and the other end of the flexible circuit board is used to connect to an external power supply. It can be understood that the flexible circuit board is used to connect and conduct the external circuit with the two voice coils 32 of the sound generating device 100. The flexible circuit board is provided with an inner pad and an outer pad. The inner pad of the flexible circuit board is connected and conducted with the sound generating device 100, and the outer pad of the flexible circuit board is used to connect to an external terminal.

[0123] In this embodiment, the device housing has an installation space, the sound generating device 100 is arranged in the installation space of the device housing, and at least one end of the flexible circuit board connected to the sound generating device 100 is located in the installation space of the device housing. Of course, in other embodiments, the flexible circuit board may also be entirely arranged in the installation space of the device housing, which is not limited herein.

[0124] It can be understood that the electronic device may be an earphone, a mobile phone, an MP3, an MP4, a computer, a tablet computer, a smart wearable device, etc., which is not limited herein. In the electronic device, the sound generating device 100 may be assembled into the housing of the electronic device in the form of a module, or assembled into the housing of the electronic device in the form of a monomer.

[0125] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: The sound-generating device comprises: A housing, wherein the housing is provided with a mounting cavity; A magnetic circuit system is provided in the mounting cavity, the magnetic circuit system includes a magnetic yoke and a central magnetic portion and a side magnetic portion provided on the magnetic yoke, the central magnetic portion includes two central magnetic groups spaced apart, the side magnetic portion includes an outer magnetic group located outside the two central magnetic groups and a common magnetic group located between the two central magnetic groups, the outer magnetic group and the common magnetic group are spaced apart from each central magnetic group to enclose two magnetic gaps spaced apart, each central magnetic group includes a first central magnet, a central magnetic plate and a second central magnet arranged in a stacked manner, the outer magnetic group and the common magnetic group include a first side magnet, a side magnetic plate and a second side magnet arranged in a stacked manner; and a vibration system disposed in the mounting cavity, the vibration system comprising a diaphragm and two voice coils connected to the diaphragm, the diaphragm having two long axis sides and two short axis sides connected end to end, the two central magnetic groups being arranged at intervals along the long axis sides, and each voice coil being disposed corresponding to one of the magnetic gaps; The first central magnet, the central magnetic conductive plate and the second central magnet respectively correspond to the first side magnet, the side magnetic conductive plate and the second side magnet in a one-to-one manner in a vibration direction perpendicular to the vibration system.

2. The sound-generating device according to claim 1, wherein: The first central magnet and the second central magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles of the first central magnet and the second central magnet close to the central magnetic conductive plate are the same; The first side magnet and the second side magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles of the first side magnet and the second side magnet close to the side magnetic conductive plate are the same; The magnetic poles of the first central magnet and the second central magnet close to the central magnetic conductive plate are opposite to the magnetic poles of the first side magnet and the second side magnet close to the side magnetic conductive plate.

3. The sound-generating device according to claim 1, wherein: The magnetic conductive yoke includes a first magnetic yoke and a second magnetic yoke arranged opposite to each other, the central magnetic portion and the side magnetic portion are both arranged between the first magnetic yoke and the second magnetic yoke, the first side magnet and the first central magnet are both connected to the first magnetic yoke, and the second side magnet and the second central magnet are connected to the second magnetic yoke.

4. The sound-generating device according to claim 3, wherein: The housing is further provided with a first through hole and a second through hole communicating with the mounting cavity. The first magnetic yoke is connected to the housing and located in the first through hole. The second magnetic yoke is connected to the housing and located in the second through hole.

5. The sound-generating device according to claim 1, wherein: The diaphragm has an inner ring hole, and the diaphragm is wound around the outside of the magnetic circuit system. In the vibration direction of the vibration system, the two side surfaces of the diaphragm do not exceed the two side surfaces of the magnetic circuit system. The magnetic circuit system is provided with an avoidance gap connecting each of the magnetic gaps. The vibration system also includes a skeleton, one end of the skeleton is connected to the diaphragm, and the other end of the skeleton passes through the avoidance gap and is connected to each of the voice coils.

6. The sound-generating device according to claim 5, wherein: There are two skeletons, which are spaced apart and symmetrically arranged along the short axis. Each skeleton is correspondingly connected to one end of two voice coils.

7. The sound-generating device according to claim 6, wherein: The skeleton includes a first connecting portion, a plurality of connecting arms, and a plurality of second connecting portions, wherein the first connecting portion is connected to the diaphragm, the plurality of connecting arms and the plurality of second connecting portions are all located on the inner side of the first connecting portion, one end of the plurality of connecting arms are connected to the first connecting portion, and the plurality of connecting arms are arranged at intervals, and at least one second connecting portion is connected to an end of the connecting arm away from the first connecting portion; Wherein, a plurality of the connecting arms pass through the avoidance gap and extend into the magnetic gap, so that the second connecting portion is connected to the voice coil.

8. The sound-generating device according to claim 5, wherein: The diaphragm includes an inner ring portion, a first fold ring arranged around the inner ring portion, a straight portion arranged around the first fold ring, a second fold ring arranged around the straight portion, and a fixed portion connected to the outer side of the second fold ring, the fixed portion is connected to the outer shell, the straight portion is connected to the frame, and the inner ring portion is formed with the inner ring hole.

9. The sound-generating device according to claim 8, wherein: The inner ring portion, the first fold ring, the straight portion, the second fold ring and the fixing portion are an integrally formed structure; And / or, the protruding direction of the first fold ring is the same as or opposite to the protruding direction of the second fold ring; And / or, the diaphragm further includes a reinforcement portion, and the reinforcement portion is arranged between the straight portion and the frame.

10. The sound-generating device according to claim 5, wherein: The sound-generating device further includes a support member having an annular structure, surrounding the magnetic circuit system and disposed on a side of the diaphragm away from the frame, wherein the outer ring of the diaphragm is connected to the housing, and the inner ring of the diaphragm is connected to the support member; And / or, the outer magnetic group includes a first portion provided on both sides of the two central magnetic groups along the extension direction of the long axis side and a second portion provided on both sides of the two central magnetic groups along the extension direction perpendicular to the short axis side, and the avoidance gap is formed between the first portion and the second portion and between the second portion and the common magnetic group; And / or, a sound outlet hole is provided on the shell, and the diaphragm divides the installation cavity around the magnetic circuit system into a front cavity and a rear cavity, the front cavity is connected to the sound outlet hole, and the rear cavity is connected to the magnetic gap.

11. An electronic device, characterized in that: The electronic device includes the sound emitting device according to any one of claims 1 to 10.

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