Sound-producing unit and electronic device

Abstract

Disclosed in the present invention are a sound-producing unit and an electronic device. The sound-producing unit comprises a housing, a magnetic circuit system and a vibration system. The magnetic circuit system comprises a support plate and two magnet assemblies, a magnetic gap being formed between the two magnet assemblies, and the support plate being made of a non-magnetically conductive material. Each magnet assembly comprises a first magnet, a second magnet and a third magnet stacked in a first direction, wherein the first magnet and the third magnet are magnetized in a second direction and have opposite directions of magnetization, the first direction being perpendicular to the second direction; the second magnet is magnetized in the first direction, and the polarity of the magnetic pole of the second magnet facing the first magnet is the same as the polarity of the magnetic pole of the first magnet close to the magnetic gap, enabling each magnet assembly to form a magnetic field-enhanced side facing the magnetic gap. The vibration system comprises a diaphragm and a flat voice coil, one side of the flat voice coil being connected to a reinforcing portion, and the other side being located inside the magnetic gap. The magnet assemblies can form magnetic field-enhanced sides facing the magnetic gap, thereby enhancing magnetic driving force, improving the acoustic performance of a loudspeaker.

Description

Sound generator and electronic devices Technical Field

[0001] This invention relates to the field of sound energy conversion technology, and in particular to a sound-generating unit and an electronic device. Background Technology

[0002] As smart wearable products become thinner, the space left for speakers is gradually decreasing while the installation space for other components remains the same. This makes it difficult to improve the acoustic performance of speakers by increasing their size. The limited internal space restricts the acoustic performance of existing speakers, making it difficult to improve their acoustic performance and thus failing to meet users' needs. Summary of the Invention

[0003] The main objective of this invention is to provide a sound-generating unit and electronic device that aims to solve the problem of how to improve the acoustic performance of a loudspeaker.

[0004] To achieve the above objectives, the present invention proposes a sound-emitting unit, wherein the aspect ratio of the sound-emitting unit is greater than 2:1, and the sound-emitting unit comprises:

[0005] case;

[0006] A magnetic circuit system includes a support plate and two magnet assemblies spaced apart from each other on the support plate, with a magnetic gap between the two magnet assemblies. The support plate is made of a non-magnetic material. Each magnet assembly includes a first magnet, a second magnet, and a third magnet arranged sequentially along a first direction. The third magnet is located on the support plate. The first magnet and the third magnet are both magnetized along a second direction but in opposite directions. The first direction and the second direction are perpendicular. The second magnet is magnetized along the first direction, and the polarity of the second magnet's pole facing the first magnet is the same as the polarity of the first magnet's pole near the magnetic gap, so that each magnet assembly can form a magnetic field enhancement side facing the magnetic gap. Furthermore, the polarities of the two first magnets' poles near the magnetic gap are opposite.

[0007] A vibration system comprising a diaphragm and a flat voice coil for driving the diaphragm to vibrate along a first direction, the diaphragm comprising a folded ring and a reinforcing portion disposed in the central region of the folded ring, the folded ring being connected to the housing, the flat voice coil being connected to the reinforcing portion and located within the magnetic gap, the axial direction of the flat voice coil being disposed along the second direction.

[0008] In one embodiment, the sound-generating unit further includes a waterproof sealing ring, which is disposed around the folded ring;

[0009] The waterproof sealing ring, the folding ring, the reinforcing part, and the shell are integrally injection molded.

[0010] Alternatively, the outer wall of the waterproof sealing ring has a first inclined surface that is inclined inward, and the inner wall of the waterproof sealing ring has a second inclined surface that is inclined outward, wherein the angle between the first inclined surface and the first direction is greater than the angle between the second inclined surface and the first direction.

[0011] In one embodiment, the vibration system further includes a support frame, and the reinforcing portion and the flat voice coil are both connected to the support frame;

[0012] Alternatively, the reinforcing portion may have a support portion that bends and extends along the first direction, the support portion being connected to the flat voice coil;

[0013] And / or, the vibration system further includes a reinforcing bracket, the reinforcing bracket being disposed on the side of the reinforcing portion facing the flat voice coil, the reinforcing bracket being bent along the first direction toward the flat voice coil to form a reinforcing bent portion; the ratio of the height of the reinforcing bent portion along the first direction to the width of the reinforcing portion along the second direction is greater than 1:4; or, the ratio of the height of the reinforcing bent portion along the first direction to the width of the reinforcing portion along the second direction is not less than 1:10 and not greater than 1:4.

[0014] In one embodiment, the reinforcing part is provided with a plurality of micropores, and the sound-generating unit further includes a waterproof and breathable membrane covering the micropores;

[0015] Alternatively, at least a portion of the reinforcing part is made of breathable material, and the sound-generating monomer further includes a waterproof and breathable membrane covering the breathable material;

[0016] And / or, the reinforcing part is provided with reinforcing ribs, which are located in the central region of the reinforcing part and extend along the long side of the shell.

[0017] In one embodiment, the housing includes an annular body and a sidewall connected to the annular body, the sidewall having a first through hole, and the magnet assembly having a first protrusion extending into the first through hole;

[0018] And / or, the first magnet protrudes along the first direction away from the support plate on the side near the magnetic gap to form a second protrusion, and the housing is provided with a second through hole for avoiding the second protrusion, and the second through hole communicates with the magnetic gap.

[0019] In one embodiment, the sound-generating unit further includes a centering support plate, which includes a first fixing part, a spring arm part, and a second fixing part. The first fixing part is disposed in the housing, the second fixing part is connected to the flat voice coil, and the two ends of the spring arm part are respectively connected to the first fixing part and the second fixing part.

[0020] In one embodiment, the centering support includes two, which are respectively disposed at both ends of the long side of the housing. The two centering supports are connected by a conductive connection part, and the conductive connection part is also provided with an external solder pad that can be electrically connected to an external circuit.

[0021] In one embodiment, the housing includes an annular body and a sidewall connected to the annular body, the support plate includes a bottom plate and a surrounding plate, the magnet assembly is disposed on the bottom plate, the surrounding plate is connected to the sidewall, and the first fixing part is clamped between the surrounding plate and the sidewall;

[0022] And / or, the first fixing part is provided with an injection hole, and the housing is provided with an injection groove communicating with the injection hole, the injection hole and the injection groove being used to hold glue;

[0023] And / or, the first fixing part is provided with a first solder pad, and the housing is provided with a second solder pad that is soldered to the first solder pad;

[0024] And / or, the vibration system further includes a support, the support including a body portion extending in a first direction, a first connecting portion and a second connecting portion located at both ends of the body portion in the first direction and bent in a second direction, and a third connecting portion extending from the inner end of the body portion in the first direction, the first connecting portion connecting to the reinforcing portion, the second connecting portion connecting to the second fixing portion, and the third connecting portion connecting to the side of the flat voice coil.

[0025] In one embodiment, the conductive connection portion and the centering support piece are integrally formed components;

[0026] And / or, the conductive connection portion includes a main body portion connecting the two centering support plates and an external connection portion connected to one end of the main body portion, the external connection portion being provided with the external solder pad, the main body portion being located on the side of the magnetic circuit system, and the outer surface of the main body portion not extending beyond the outer surface of the housing;

[0027] And / or, the conductive connection part includes a main body part connecting the two centering support plates and an external connection part connected to one end of the main body part. The external connection part is provided with the external solder pad. The main body part is located on the side of the magnetic circuit system. The sound generating unit also includes a pressure plate. The pressure plate is connected to the housing. The main body part is located between the third magnet and the pressure plate. The outer surface of the pressure plate does not extend beyond the outer surface of the housing.

[0028] In one embodiment, the sound-generating unit further includes a front cover, which is disposed on the side of the diaphragm away from the magnetic circuit system. The front cover has mesh openings, and the sound-generating unit further includes a dustproof net that covers the mesh openings.

[0029] In one embodiment, the sound-generating unit further includes a waterproof sealing ring, which is connected to the side of the housing away from the magnetic circuit system. The waterproof sealing ring is arranged around the folded ring and forms an annular step at the connection with the folded ring. The front cover is disposed on the annular step and located inside the waterproof sealing ring.

[0030] And / or, the mesh is of an irregular shape;

[0031] And / or, the mesh includes a first hole and a second hole, wherein the first hole and the second hole have different hole areas;

[0032] The first hole and the second hole are arranged alternately along the long or short side of the sound-emitting unit, or the first hole is scattered among the second holes, or the front cover includes a first region corresponding to the first hole and a second region corresponding to the second hole.

[0033] In one embodiment, the flat voice coil includes a first long axis segment and a second long axis segment arranged sequentially at intervals along the first direction. The first long axis segment is connected to the diaphragm. Both the first long axis segment and the second long axis segment extend along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0034] The thickness of the first magnet along the first direction is not less than 80% of the height of the first long axis segment along the first direction.

[0035] And / or, the thickness of the third magnet along the first direction is not less than 80% of the height of the second long axis segment along the first direction;

[0036] And / or, the thickness of the first magnet and the third magnet along the first direction is greater than the thickness of the second magnet along the first direction.

[0037] In one embodiment, the aspect ratio of the inner diameter of the flat voice coil is not greater than 20:1;

[0038] And / or, the aspect ratio of the sound-emitting unit is not greater than 10:1;

[0039] And / or, the housing has a central portion and ends located at both ends of the central portion along the long side direction of the housing, the outer surface of the central portion protruding from the side away from the flat voice coil.

[0040] In one embodiment, the support plate has a clearance groove corresponding to the magnetic gap for avoiding the flat voice coil;

[0041] Alternatively, the support plate may have an avoidance hole for avoiding the flat voice coil corresponding to the magnetic gap, and the sound-generating unit may also include a cover for covering the avoidance hole, the cover being disposed on the side of the support plate away from the magnet assembly along the first direction;

[0042] And / or, the support plate includes a base plate, a surrounding plate disposed around the periphery of the base plate, and a first mounting ear and a second mounting ear disposed at both ends of the surrounding plate along a third direction. The first mounting ear is provided with a first mounting hole and a first positioning hole at intervals along the third direction. The second mounting ear is provided with a second mounting hole and a second positioning hole at intervals along the third direction. The second positioning hole extends through the outer edge of the second mounting ear along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0043] The present invention also proposes an electronic device, the electronic device comprising a housing and the aforementioned sound-emitting unit, the sound-emitting unit being disposed within the housing.

[0044] The technical solution of the present invention sets two magnet assemblies spaced apart. Each magnet assembly consists of a first magnet, a second magnet, and a third magnet stacked along a first direction. The first and third magnets are magnetized along a second direction but in opposite directions. The second magnet is magnetized along the first direction, and the polarity of the second magnet's magnetic pole facing the first magnet is the same as the polarity of the first magnet's magnetic pole near the magnetic gap. This allows each magnet assembly to form a magnetic field enhancement side facing the magnetic gap, thereby increasing the magnetic field driving force and improving the acoustic performance of the loudspeaker. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0046] Figure 1 is a structural schematic diagram of an embodiment of the sound-generating unit provided by the present invention;

[0047] Figure 2 is an exploded structural diagram of an embodiment of the sound-generating monomer provided by the present invention;

[0048] Figure 3 is a cross-sectional structural schematic diagram of an embodiment of the sound-generating unit provided by the present invention;

[0049] Figure 4 is a magnified view of part A in Figure 3;

[0050] Figure 5 is a partial structural schematic diagram of an embodiment of the sound-generating unit provided by the present invention;

[0051] Figure 6 is a partial structural schematic diagram of an embodiment of the sound-generating unit provided by the present invention from another perspective.

[0052] Figure 7 is a structural schematic diagram of an embodiment of the diaphragm and housing provided by the present invention;

[0053] Figure 8 is a cross-sectional structural schematic diagram of an embodiment of the reinforcing part and the reinforcing part support provided by the present invention;

[0054] Figure 9 is a structural schematic diagram of an embodiment of the reinforcing part and the reinforcing part support provided by the present invention;

[0055] Figure 10 is a schematic diagram of another embodiment of the reinforcing part and the reinforcing part bracket provided by the present invention;

[0056] Figure 11 is a schematic diagram of an embodiment of the magnet assembly and flat voice coil provided by the present invention;

[0057] Figure 12 is a schematic diagram of the magnetic field line distribution of an embodiment of the magnet assembly and flat voice coil provided by the present invention;

[0058] Figure 13 is a schematic diagram of an embodiment of the centering support and housing provided by the present invention;

[0059] Figure 14 is a structural schematic diagram of an embodiment of the support plate provided by the present invention;

[0060] Figure 15 is a structural schematic diagram of an embodiment of the reinforcing part provided by the present invention having reinforcing ribs;

[0061] Figure 16 is a structural schematic diagram of another embodiment of the sound-generating unit provided by the present invention;

[0062] Figure 17 is a schematic diagram of an embodiment of the front cover provided by the present invention having a first hole and a second hole;

[0063] Figure 18 is a structural schematic diagram of an embodiment of the front cover provided by the present invention;

[0064] Figure 19 is a schematic diagram of another embodiment of the front cover provided by the present invention having a first hole and a second hole;

[0065] Figure 20 is a structural schematic diagram of another embodiment of the front cover provided by the present invention;

[0066] Figure 21 is a structural schematic diagram of another embodiment of the front cover provided by the present invention;

[0067] Figure 22 is a schematic diagram of another embodiment of the front cover provided by the present invention having a first hole and a second hole;

[0068] Figure 23 is a schematic diagram of an embodiment of the present invention in which the sound-generating unit is disposed inside the outer shell.

[0069] Explanation of reference numerals in the attached diagram: 100, sound-generating unit; 1, shell; 11, annular body; 12, side wall; 121, first through hole; 13. Second through hole; 14. Center part; 15. End part; 16. Glue injection groove; 17. Second solder pad; 2. Magnetic circuit system; 21. Support plate; 211. Clearance hole; 212. Base plate; 213. Enclosure plate; 214. First mounting ear; 2141. First mounting hole; 2142. First positioning hole; 215. Second mounting ear; 2151. Second mounting hole; 2152. Second positioning hole; 22. Magnet assembly; 221. First magnet; 2211. Second protrusion; 222. Second magnet; 223. Third magnet; 224. Magnetic gap; 225. First protrusion; 3. Vibration system; 31. Diaphragm; 311. Surround; 312. Reinforcing part; 3121. Annular positioning part; 3122. Positioning groove; 313. Reinforcing rib; 314. Micro-hole; 32. Flat voice coil; 321. First long shaft section; 322. Second long shaft section; 33. Vibration gap; 4. Waterproof sealing ring; 41. First inclined surface; 42. Second inclined surface; 43. Annular step; 5. Bracket; 51. Main body; 52. First connecting part; 53. Second connecting part; 54. Third connecting part; 6. Reinforcing bracket; 61. Cavity; 62. Opening; 63. Connecting hole; 64. Reinforcing bending part; 7. Waterproof and breathable membrane; 8. Centering support plate; 81. First fixing part; 82. Second fixing part; 83. Spring arm part; 84. Glue injection hole; 85. First solder pad; 9. Conductive connection part; 91. Main body; 92. External connecting part; 921. External solder pad; 10. Pressure plate; 20. Front cover; 201. Mesh; 2011. First hole; 2012. Second hole; 30. Dustproof net; 40. Covering part; 200. Outer shell.

[0070] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0071] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0072] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0073] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0074] As smart wearable products become thinner, the space left for speakers is gradually decreasing while the installation space for other components remains the same. This makes it difficult to improve the acoustic performance of speakers by increasing their size. The limited internal space restricts the acoustic performance of existing speakers, making it difficult to improve their acoustic performance and thus failing to meet users' needs.

[0075] Therefore, it is necessary to propose a sound-generating unit and electronic device aimed at solving how to improve the acoustic performance of loudspeakers.

[0076] Please refer to Figures 1, 2, 11, and 12. In one embodiment of the present invention, the aspect ratio of the sound-generating unit 100 is greater than 2:1. The sound-generating unit 100 includes a housing 1, a magnetic circuit system 2, and a vibration system 3. The magnetic circuit system 2 includes a support plate 21 and two magnet assemblies 22 spaced apart from each other on the support plate 21. A magnetic gap 224 is formed between the two magnet assemblies 22. The support plate 21 is made of a non-magnetic material. Each magnet assembly 22 includes a first magnet 221, a second magnet 222, and a third magnet 223 arranged sequentially along a first direction. The third magnet 223 is connected to the support plate 21. The first magnet 221 and the third magnet 223 are both magnetized along a second direction, but in opposite directions. The first direction and the second direction are perpendicular. 22 is magnetized along the first direction, and the polarity of the second magnet 222 facing the first magnet 221 is the same as the polarity of the first magnet 221 near the magnetic gap 224, so that each magnet assembly 22 can form a magnetic field enhancement side facing the magnetic gap 224, and the polarities of the two first magnets 221 near the magnetic gap 224 are opposite; the vibration system 3 includes a diaphragm 31 and a flat voice coil 32 for driving the diaphragm 31 to vibrate along the first direction. The diaphragm 31 includes a folded ring 311 and a reinforcing portion 312 disposed in the central region of the folded ring 311. The folded ring 311 is connected to the housing 1. The flat voice coil 32 is connected to the reinforcing portion 312 and is located in the magnetic gap 224. The axial direction of the flat voice coil 32 is arranged along the second direction.

[0077] The sound-generating unit 100 of the present invention can be a loudspeaker unit, and can be applied in the sound-generating module of an electronic device, such as a computer, mobile phone, or smart wearable device. This embodiment uses a loudspeaker unit as an example for illustration.

[0078] The technical solution of the present invention sets two magnet assemblies 22 spaced apart. Each magnet assembly 22 is composed of a first magnet 221, a second magnet 222, and a third magnet 223 stacked along a first direction. The first magnet 221 and the third magnet 223 are both magnetized along a second direction but in opposite directions. The second magnet 222 is magnetized along the first direction, and the polarity of the magnetic pole of the second magnet 222 facing the first magnet 221 is the same as the polarity of the magnetic pole of the first magnet 221 near the magnetic gap 224. This allows each magnet assembly 22 to form a magnetic field enhancement side facing the magnetic gap 224. Furthermore, the polarities of the magnetic poles of the two first magnets 221 near the magnetic gap 224 are opposite, causing the magnetic lines of force of the two magnet assemblies 22 to form a ring, thereby increasing the magnetic field driving force and improving the acoustic performance of the speaker.

[0079] In this diagram, the first direction is the up-down direction as shown in Figure 1, and the second direction is the left-right direction as shown in Figure 1. Taking the first magnet 221 being magnetized to the left as an example, the second magnet 222, located to the left of the magnetic gap 224, is magnetized downwards, and the second magnet 222, located to the right of the magnetic gap 224, is magnetized upwards. The third magnet 223 is magnetized to the right, so that each magnet assembly 22 forms a magnetic field enhancement side facing the magnetic gap 224. The two magnet assemblies 22 can form a complete closed loop of magnetic field lines, thereby increasing the magnetic field strength and improving the acoustic performance of the speaker. It should be noted that the support plate 21 is made of a non-magnetic material to allow more magnetic field lines to pass through the flat voice coil 32 and to avoid the magnetic field lines from dispersing.

[0080] In this embodiment, the sound-emitting unit 100 has a narrow and elongated shape. The sound-emitting unit 100 has a height (thickness) along a first direction, and a length and width along a direction perpendicular to the first direction. The ratio of the length to the width of the sound-emitting unit 100 is greater than 2:1, which can better fit the reserved space of the microelectronic device.

[0081] It should be noted that the aspect ratio of the sound-emitting unit 100 refers to the ratio of the length dimension of the sound-emitting unit 100 in the third direction to the width dimension of the sound-emitting unit 100 in the second direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other. The third direction is the front-back direction shown in Figure 1.

[0082] It should also be noted that when the flat voice coil 32 is energized, it reciprocates within the magnetic gap 224, cutting magnetic lines of force, which drives the diaphragm 31 to vibrate up and down, thereby inducing air to produce sound and completing the energy conversion between electroacoustics. The flat voice coil 32 can be directly connected to the diaphragm 31, or it can be connected to the diaphragm 31 through other structural components such as a connecting frame.

[0083] According to one embodiment of the present invention, the first magnet 221 can be a bar magnet or multiple segmented magnets; the second magnet 222 can be a bar magnet or multiple segmented magnets; and the third magnet 223 can be a bar magnet or multiple segmented magnets.

[0084] In this embodiment, the first magnet 221, the second magnet 222, and the third magnet 223 are connected sequentially, making the entire magnetic circuit system 2 more compact and reducing the space occupied by the magnetic circuit system 2. Furthermore, by placing the third magnet 223 on the support plate 21, the magnet assembly 22 is connected to the support plate 21. Furthermore, the first magnet 221 can be connected to the housing 1, thus fixing the magnet assembly 22 and the housing 1 together.

[0085] Please refer to Figures 3, 5, and 6. In one embodiment, the sound-generating unit 100 further includes a waterproof sealing ring 4, which surrounds the folded ring 311. The waterproof sealing ring 4, folded ring 311, reinforcing part 312, and shell 1 are integrally injection molded. By providing the waterproof sealing ring 4, the waterproof performance of the sound-generating unit 100 is improved. By integrally injection molding the waterproof sealing ring 4, folded ring 311, reinforcing part 312, and shell 1, the number of sealing surfaces is effectively reduced, thereby improving the waterproof performance of the sound-generating unit 100. It should be noted that the height of the diaphragm 31 is lower than that of the waterproof sealing ring 4, resulting in a vibration gap 33 between the diaphragm 31 and the waterproof sealing ring 4. When the waterproof sealing ring 4 seals against the shell 200, this vibration gap 33 provides a larger vibration space for the diaphragm 31, reducing the probability of interference between the diaphragm 31 and the shell 200.

[0086] Referring to Figures 3 and 4, in one embodiment, the outer sidewall 12 of the waterproof sealing ring 4 has a first inclined surface 41 that is inclined inward, and the inner sidewall 12 of the waterproof sealing ring 4 has a second inclined surface 42 that is inclined outward. The angle between the first inclined surface 41 and the first direction is greater than the angle between the second inclined surface 42 and the first direction. This arrangement ensures that when the waterproof sealing ring 4 comes into contact with the housing 200 of the electronic device, it will bend inward rather than fold outward under pressure, thus ensuring better waterproof performance of the sound-generating unit 100. It should be noted that the angle between the first inclined surface 41 and the first direction is α in Figure 4, and the angle between the second inclined surface 42 and the first direction is β in Figure 4.

[0087] Please refer to Figures 2, 5 and 6. In one embodiment, the vibration system 3 further includes a support 5, and the reinforcing part 312 and the flat voice coil 32 are both connected to the support 5. The driving force of the flat voice coil 32 is transmitted by setting the support 5, thereby driving the diaphragm 31 to vibrate.

[0088] In one embodiment, the reinforcing portion 312 has a support portion that bends and extends along a first direction, and the support portion is connected to the flat voice coil 32. By providing the support portion to connect the flat voice coil 32, the original support 5 is replaced, eliminating the support 5 structural component, reducing the installation process of the support 5, and lowering the production cost of the sound-generating unit 100. It should be noted that the reinforcing portion 312 can be a polymer material, such as polyphthalamide, polyphthalamide with 35% glass fiber, or carbon fiber, metal alloy, etc.

[0089] Please refer to Figures 8 to 10. In one embodiment, the vibration system 3 further includes a reinforcing bracket 6. The reinforcing bracket 6 is disposed on the side of the reinforcing portion 312 facing the flat voice coil 32. The reinforcing bracket 6 is bent along a first direction toward the flat voice coil 32 to form a reinforcing bent portion 64. The ratio of the height of the reinforcing bent portion 64 along the first direction to the width of the reinforcing portion 312 along the second direction is greater than 1:4; or, the ratio of the height of the reinforcing bent portion 64 along the first direction to the width of the reinforcing portion 312 along the second direction is not less than 1:10 and not greater than 1:4. Specifically, the ratio of the height of the reinforcing bend 64 along the first direction to the width of the reinforcing part 312 along the second direction is greater than 1:4. This setting allows the segmented vibration frequency of the reinforcing part 312 to be located after 10kHz. The ratio of the height of the reinforcing bend 64 along the first direction to the width of the reinforcing part 312 along the second direction is not less than 1:10 and not greater than 1:4. This setting allows the segmented vibration frequency of the reinforcing part 312 to be located between 4kHz and 10kHz. It should be noted that the height of the reinforcing bend 64 along the first direction is shown as a in Figure 8, and the width of the reinforcing part 312 along the second direction is shown as b in Figure 8.

[0090] Please refer to Figure 9. According to an embodiment of the present invention, the reinforcing bracket 6 is hollow to form a cavity 61. At least one of the two ends of the reinforcing bracket 6 is provided with an opening 62 communicating with the cavity 61. The cavity 61 communicates with the micropores 314 on the reinforcing part 312 so as to balance the internal and external air pressure of the sound-generating unit 100.

[0091] Please refer to Figure 10. According to another embodiment of the present invention, the reinforcing bracket 6 is hollow to form a cavity 61. The cavity 61 communicates with the micropores 314 on the reinforcing part 312. The outer wall of the reinforcing bracket 6 is provided with a connecting hole 63 communicating with the cavity 61. There are multiple connecting holes 63, which are arranged sequentially at intervals along the extension direction of the reinforcing bracket 6. The connecting holes 63 are provided to balance the internal and external air pressure of the sound-generating unit 100.

[0092] Referring to Figure 7, in one embodiment, the reinforcing portion 312 is provided with a plurality of micropores 314, and the sound-generating unit 100 also includes a waterproof and breathable membrane 7 covering the micropores 314. By providing a plurality of micropores 314 on the reinforcing portion 312, it is beneficial to balance the air pressure inside and outside the sound-generating unit 100. By providing the waterproof and breathable membrane 7 covering the micropores 314, the waterproof performance of the sound-generating unit 100 is effectively improved while ensuring the balance of air pressure inside and outside the sound-generating unit 100.

[0093] In one embodiment, at least a portion of the reinforcing part 312 is made of a breathable material, and the sound-generating unit 100 further includes a waterproof and breathable membrane 7 covering the breathable material. By making at least a portion of the reinforcing part 312 a breathable material, it facilitates the balance of air pressure inside and outside the sound-generating unit 100. By providing the waterproof and breathable membrane 7 covering the breathable material, the waterproof performance of the sound-generating unit 100 is effectively improved while ensuring the balance of air pressure inside and outside the sound-generating unit 100. It should be noted that the breathable material can be an organic aerogel, or a foamed metal, etc.

[0094] Referring to Figure 15, in one embodiment, the reinforcing portion 312 is provided with a reinforcing rib 313, which is located in the central region of the reinforcing portion 312 and extends along the long side of the housing 1. By providing the reinforcing rib 313, the structure of the reinforcing portion 312 is strengthened, thereby effectively shifting the resonance of the reinforcing portion 312 to a higher frequency.

[0095] Referring to Figures 1 and 3, in one embodiment, the housing 1 includes an annular body 11 and sidewalls 12 connected to the annular body 11. The sidewalls 12 have a first through-hole 121. Each magnet assembly 22 has a first protrusion 225 extending into the first through-hole 121. By opening the first through-hole 121 in the sidewalls 12, each magnet assembly 22 can extend outward to form the first protrusion 225, thereby increasing the volume of the magnet assembly 22, improving the magnetic field strength, and thus enhancing the acoustic performance of the sound-generating unit 100. It should be noted that the first through-hole 121 penetrates the two sidewalls 12 arranged opposite each other along the second direction. Each magnet assembly 22 has two outer walls arranged opposite each other along the second direction that extend outward to form the first protrusion 225. The two first protrusions 225 are respectively located within the two first through-holes 121.

[0096] Referring to Figures 3 and 11, in one embodiment, the first magnet 221 protrudes along a first direction away from the support plate 21 on the side near the magnetic gap 224 to form a second protrusion 2211. The housing 1 has a second through hole 13 for avoiding the second protrusion 2211, and the second through hole 13 communicates with the magnetic gap 224. By providing the second protrusion 2211, the size of the first magnet 221 is increased, further expanding the magnetic field region of the flat voice coil 32, so that the driving force factor of the flat voice coil 32 can be symmetrical with respect to the static equilibrium position.

[0097] Please refer to Figures 1, 2, and 6. In one embodiment, the sound-generating unit 100 further includes a centering support 8. The centering support 8 includes a first fixing part 81, a spring arm part 83, and a second fixing part 82. The first fixing part 81 is disposed on the housing 1, and the second fixing part 82 is connected to the flat voice coil 32. The two ends of the spring arm part 83 are respectively connected to the first fixing part 81 and the second fixing part 82. The magnet assemblies 22 all have clearance space to avoid the centering support 8. By providing the centering support 8, the probability of polarization of the flat voice coil 32 is reduced, and the vibration stability of the flat voice coil 32 is improved. In this embodiment, the installation space of the centering support 8 is formed between the magnet assemblies 22.

[0098] In one embodiment, the centering support plate 8 includes two plates, which are respectively disposed at both ends of the long side of the housing 1. The two centering support plates 8 are connected by a conductive connection portion 9, which is also provided with an external solder pad 921 that can be electrically connected to an external circuit. By arranging the conductive connection portion 9 along the long side of the housing 1, the two centering support plates 8 can be electrically conductive, thereby facilitating the introduction of external circuit current into the flat voice coil 32.

[0099] Please refer to Figures 2 and 14. In one embodiment, the housing 1 includes an annular body 11 and a side wall 12 connected to the annular body 11. The support plate 21 includes a bottom plate 212 and a surrounding plate 213. The magnet assembly 22 is disposed on the bottom plate 212. The surrounding plate 213 is connected to the side wall 12. A first fixing part 81 is sandwiched between the surrounding plate 213 and the side wall 12. The first fixing part 81 is sandwiched between the surrounding plate 213 and the side wall 12, thereby effectively fixing the first fixing part 81 and improving the vibration stability of the flat voice coil 32.

[0100] Please refer to Figures 2 and 13. In one embodiment, the first fixing part 81 is provided with an injection hole 84, and the housing 1 is provided with an injection groove 16 communicating with the injection hole 84. The injection hole 84 and the injection groove 16 are used to contain glue. Glue is injected into the injection groove 16 through the injection hole 84, thereby connecting the first fixing part 81 and the housing 1 through the solidified glue, thereby improving the reliability of the connection between the first fixing part 81 and the housing 1.

[0101] Please refer to Figures 2 and 13. In one embodiment, the first fixing part 81 is provided with a first solder pad 85, and the housing 1 is provided with a second solder pad 17 corresponding to the first solder pad 85 and soldered to the first solder pad 85. By soldering the first solder pad 85 to the second solder pad 17, the reliability of the connection between the first fixing part 81 and the housing 1 is improved.

[0102] Please refer to Figures 2 and 6. In one embodiment, the vibration system 3 further includes a support 5. The support 5 includes a body portion 51 extending along a first direction, a first connecting portion 52 and a second connecting portion 53 located at both ends of the body portion 51 along the first direction and bent along a second direction, and a third connecting portion 54 extending from the inner end of the body portion 51 along the first direction. The first connecting portion 52 connects to the reinforcing portion 312, the second connecting portion 53 connects to the second fixing portion 82, and the third connecting portion 54 connects to the side of the flat voice coil 32. This arrangement allows the support 5 to simultaneously connect the diaphragm 31, the flat voice coil 32, and the centering support 8, thereby simplifying the connection method of each component of the vibration system 3, saving on the number of parts, reducing the space occupied by the sound-generating unit 100, and improving the sound performance of the sound-generating unit 100. It should be noted that there are two supports 5, which are arranged at both ends of the flat voice coil 32 along a third direction, thereby effectively reducing the probability of polarization of the flat voice coil 32.

[0103] Please refer to Figures 2, 9, and 10. According to an embodiment of the present invention, an annular positioning portion 3121 is provided on the side of the reinforcing portion 312 facing the magnet assembly 22. A positioning groove 3122 is formed in the middle of the annular positioning portion 3121. The first connecting portion 52 extends into the first positioning groove 3122 and connects to the reinforcing portion 312. The annular positioning portion 3121 is provided to facilitate the assembly of the bracket 5. The number of annular positioning portions 3121 is the same as the number of brackets 5 and they are provided in a one-to-one correspondence.

[0104] In one embodiment, the conductive connection part 9 and the centering support piece 8 are integrally formed parts; by integrally forming the conductive connection part 9 and the centering support piece 8, the number of parts that need to be assembled is reduced, and the assembly steps are omitted, which not only improves the assembly efficiency of the sound-generating unit 100, but also avoids assembly errors.

[0105] In one embodiment, the conductive connection portion 9 includes a main body portion 91 connecting two centering support plates 8 and an external connection portion 92 connected to one end of the main body portion 91. The external connection portion 92 is provided with an external solder pad 921. The main body portion 91 is located on the side of the magnetic circuit system 2, and the outer surface of the main body portion 91 does not exceed the outer surface of the housing 1. The outer surface of the main body portion 91 does not exceed the outer surface of the housing 1, thereby avoiding the phenomenon that the overall size of the sound-generating unit 100 increases due to the protrusion of the main body portion 91 and the risk of interference between the main body portion 91 and other components of the electronic device.

[0106] Please refer to Figures 2 and 3. In one embodiment, the conductive connection portion 9 includes a main body portion 91 connecting two centering support plates 8 and an external connection portion 92 connected to one end of the main body portion 91. The external connection portion 92 is provided with an external solder pad 921. The main body portion 91 is located on the side of the magnetic circuit system 2. The sound-generating unit 100 also includes a pressure plate 10, which is connected to the housing 1. The main body portion 91 is disposed between the third magnet 223 and the pressure plate 10. The outer surface of the pressure plate 10 does not extend beyond the outer surface of the housing 1. The pressure plate 10 is provided to prevent the main body portion 91 from warping and interfering with other parts. The fact that the outer surface of the pressure plate 10 does not extend beyond the outer surface of the housing 1 is to avoid the phenomenon that the overall size of the sound-generating unit 100 would increase due to the pressure plate 10 protruding from the outer surface of the housing 1, and to avoid the pressure plate 10 protruding from the outer surface of the housing 1 and interfering with other parts. It should be noted that the pressure plate 10 is provided with a riveting hole, which can be fixedly connected to a hot-melt riveting post provided on the housing 1.

[0107] Referring to Figures 2, 3, and 17, in one embodiment, the sound-generating unit 100 further includes a front cover 20, which is located on the side of the diaphragm 31 away from the magnetic circuit system 2. The front cover 20 has mesh openings 201. The sound-generating unit 100 also includes a dustproof net 30, which covers the mesh openings 201. By providing mesh openings 201 on the front cover 20, the probability of sharp objects puncturing the diaphragm 31 and causing the sound-generating unit 100 to fail can be effectively reduced. The dustproof net 30 covering the mesh openings 201 is to prevent external dust from falling onto the diaphragm 31 through the mesh openings 201 and affecting the acoustic performance of the sound-generating unit 100. It should be noted that there are multiple mesh openings 201, and the shapes and sizes of the multiple mesh openings 201 are not entirely the same, and the distribution of the multiple mesh openings 201 can be adjusted as needed.

[0108] Please refer to Figures 2 and 3. In one embodiment, the sound-generating unit 100 further includes a waterproof sealing ring 4. The waterproof sealing ring 4 is connected to the side of the housing 1 away from the magnetic circuit system 2. The waterproof sealing ring 4 is arranged around the folded ring 311 and forms an annular step 43 at the connection with the folded ring 311. The front cover 20 is disposed on the annular step 43 and located inside the waterproof sealing ring 4. By forming the annular step 43 to reliably support the front cover 20, the front cover 20 is placed at the annular step 43, so that the size of the entire sound-generating unit 100 will not increase due to the protrusion of the waterproof sealing ring 4. The front cover 20 is disposed on the annular step 43 and located inside the waterproof sealing ring 4, which effectively reduces the size of the sound-generating unit 100, so that the sound-generating unit 100 can better adapt to the needs of a confined installation environment.

[0109] Please refer to Figures 17 to 22. In one embodiment, the mesh 201 is irregularly shaped; the amplitude symmetry of the sound-generating unit 100 can be adjusted by adjusting the shape of the mesh 201.

[0110] In one embodiment, the mesh 201 includes a first hole 2011 and a second hole 2012, with different hole areas. The first hole 2011 and the second hole 2012 are arranged alternately along the long or short side of the sound-generating unit 100, or the first hole 2011 is scattered among the second holes 2012, or the front cover 20 includes a first region corresponding to the first hole 2011 and a second region corresponding to the second hole 2012. By changing the arrangement of the first hole 2011 and the second hole 2012, the amplitude symmetry of the sound-generating unit 100 can also be effectively adjusted.

[0111] Please refer to Figures 3 and 11. In one embodiment, the flat voice coil 32 includes a first long axis segment 321 and a second long axis segment 322 arranged sequentially at intervals along a first direction. The first long axis segment 321 is connected to the diaphragm 31. Both the first long axis segment 321 and the second long axis segment 322 extend along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. The thickness of the first magnet 221 along the first direction is not less than 80% of the height of the first long axis segment 321 along the first direction. This arrangement increases the number of magnetic lines of force passing through the first long axis segment 321, improves the driving force of the flat voice coil 32, and enhances the acoustic performance of the sound-generating unit 100.

[0112] In one embodiment, the thickness of the third magnet 223 along the first direction is not less than 80% of the height of the second long axis segment 322 along the first direction; this arrangement increases the number of magnetic lines of force passing through the second long axis segment 322, improves the driving force of the flat voice coil 32, and enhances the acoustic performance of the sound-generating unit 100.

[0113] In one embodiment, the thickness of the first magnet 221 and the third magnet 223 along the first direction is greater than the thickness of the second magnet 222 along the first direction. This arrangement increases the number of magnetic lines of force passing through the first long axis segment 321 and the second long axis segment 322, improves the driving force of the flat voice coil 32, and enhances the acoustic performance of the sound-generating unit 100.

[0114] In one embodiment, the aspect ratio of the inner diameter of the flat voice coil 32 is no greater than 20:1; controlling the aspect ratio of the inner diameter of the flat voice coil 32 to less than or equal to 20:1 is to facilitate the winding of the flat voice coil 32. It should be noted that the aspect ratio of the inner diameter of the flat voice coil 32 refers to the ratio of the length dimension of the inner circle of the flat voice coil 32 along a third direction to the width dimension of the inner circle of the flat voice coil 32 along a first direction.

[0115] In one embodiment, the aspect ratio of the sound-generating unit 100 is no greater than 10:1, thereby better adapting to the installation needs of some existing narrow installation environments.

[0116] Referring to Figures 16 and 23, in one embodiment, the housing 1 has a central portion 14 and end portions 15 located at both ends of the central portion 14 along the long side direction of the housing 1. The outer surface of the central portion 14 protrudes towards the side away from the flat voice coil 32. It should be noted that the outer surface of the central portion 14 near the diaphragm 31 protrudes towards the side away from the flat voice coil 32. The protrusion of the central portion 14 towards the side away from the flat voice coil 32 is to better adapt to the shape of the housing 200 of the electronic device, so that the housing 1 can extend along the housing 200 and achieve a sealed contact between the housing 1 and the housing 200. The protrusion of the central portion 14 towards the side away from the flat voice coil 32 makes the housing 1 have a curved or nearly curved shape to adapt to the shape of the housing 200, thereby improving the utilization rate of the internal space of the housing 200. In this embodiment, the shape of the diaphragm 31 is similar to that of the housing 1. By adapting the shape of the housing 1 to the shape of the outer shell 200, a portion of the gap is used as the vibration space for the diaphragm 31. This increases the vibration space of the diaphragm 31 without increasing the installation space of the sound-generating unit 100, and also increases the volume of the front acoustic cavity of the sound-generating unit 100, thereby effectively improving the acoustic performance of the sound-generating unit 100. It should be noted that the outer surface of the housing 1 can be an overall arc-shaped structure, or the central part 14 can be a flat part and the end part 15 can be a flat part or a curved part, or the central part 14 can be a curved part and the end part 15 can be a flat part or a curved part.

[0117] Please refer to Figures 2 and 3. In one embodiment, the support plate 21 has a clearance groove for avoiding the flat voice coil 32 corresponding to the magnetic gap 224; wherein the clearance groove is connected to the magnetic gap 224, and the flat voice coil 32 is provided with a larger vibration space by setting the clearance groove.

[0118] In one embodiment, the support plate 21 has a clearance hole 211 corresponding to the magnetic gap 224 to allow the flat voice coil 32 to pass. The sound-generating unit 100 also includes a cover 40 that covers the clearance hole 211. The cover 40 is disposed on the side of the support plate 21 away from the magnet assembly 22 along the first direction. By opening the clearance hole 211, a larger vibration space is provided for the flat voice coil 32. By providing the cover 40 that covers the clearance hole 211, the amplitude symmetry of the sound-generating unit 100 is adjusted. It should be noted that the cover 40 can be a cover plate or a nylon mesh.

[0119] Referring to Figure 14, in one embodiment, the support plate 21 includes a base plate 212, a surrounding plate 213 disposed around the base plate 212, and a first mounting ear 214 and a second mounting ear 215 disposed at both ends of the surrounding plate 213 along a third direction. The first mounting ear 214 is provided with a first mounting hole 2141 and a first positioning hole 2142 spaced apart along a third direction. The second mounting ear 215 is provided with a second mounting hole 2151 and a second positioning hole 2152 spaced apart along a third direction. The second positioning hole 2152 extends through the outer edge of the second mounting ear 215 along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The first mounting hole 2141 and the second mounting hole 2151 are provided to facilitate the installation of the sound-generating unit 100. The first positioning hole 2142 and the second positioning hole 2152 are provided to facilitate the precise positioning of the sound-generating unit 100 and prevent the sound-generating unit 100 from being misaligned during assembly into the housing 200.

[0120] Referring to Figure 23, this invention also proposes an electronic device, which includes a housing 200 and the aforementioned sound-emitting unit 100, with the sound-emitting unit 100 disposed within the housing 200. The electronic device can be a computer, mobile phone, smart wearable device, etc. Since this electronic device employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0121] The above are merely exemplary embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sound producing monomer, characterized in that, The aspect ratio of the sound-emitting unit is greater than 2:1, and the sound-emitting unit includes: case; A magnetic circuit system includes a support plate and two magnet assemblies spaced apart from each other on the support plate, with a magnetic gap between the two magnet assemblies. The support plate is made of a non-magnetic material. Each magnet assembly includes a first magnet, a second magnet, and a third magnet arranged sequentially along a first direction. The third magnet is located on the support plate. The first magnet and the third magnet are both magnetized along a second direction but in opposite directions. The first direction and the second direction are perpendicular. The second magnet is magnetized along the first direction, and the polarity of the second magnet's pole facing the first magnet is the same as the polarity of the first magnet's pole near the magnetic gap, so that each magnet assembly can form a magnetic field enhancement side facing the magnetic gap. Furthermore, the polarities of the two first magnets' poles near the magnetic gap are opposite. A vibration system comprising a diaphragm and a flat voice coil for driving the diaphragm to vibrate along a first direction, the diaphragm comprising a folded ring and a reinforcing portion disposed in the central region of the folded ring, the folded ring being connected to the housing, the flat voice coil being connected to the reinforcing portion and located within the magnetic gap, the axial direction of the flat voice coil being disposed along the second direction.

2. The sound producing monomer of claim 1, wherein, The sound-generating unit also includes a waterproof sealing ring, which is arranged around the folded ring; The waterproof sealing ring, the folding ring, the reinforcing part, and the shell are integrally injection molded. Alternatively, the outer wall of the waterproof sealing ring has a first inclined surface that is inclined inward, and the inner wall of the waterproof sealing ring has a second inclined surface that is inclined outward, wherein the angle between the first inclined surface and the first direction is greater than the angle between the second inclined surface and the first direction.

3. The sound producing monomer of claim 1, wherein, The vibration system also includes a support frame, and the reinforcing part and the flat voice coil are both connected to the support frame; Alternatively, the reinforcing portion may have a support portion that bends and extends along the first direction, the support portion being connected to the flat voice coil; And / or, the vibration system further includes a reinforcing bracket, the reinforcing bracket being disposed on the side of the reinforcing portion facing the flat voice coil, the reinforcing bracket being bent along the first direction toward the flat voice coil to form a reinforcing bent portion; the ratio of the height of the reinforcing bent portion along the first direction to the width of the reinforcing portion along the second direction is greater than 1:4; or, the ratio of the height of the reinforcing bent portion along the first direction to the width of the reinforcing portion along the second direction is not less than 1:10 and not greater than 1:

4.

4. The sound producing monomer of claim 1, wherein, The reinforcing part is provided with multiple micropores, and the sound-generating unit also includes a waterproof and breathable membrane covering the micropores; Alternatively, at least a portion of the reinforcing part is made of breathable material, and the sound-generating monomer further includes a waterproof and breathable membrane covering the breathable material; And / or, the reinforcing part is provided with reinforcing ribs, which are located in the central region of the reinforcing part and extend along the long side of the shell.

5. The sound producing monomer of claim 1, wherein, The housing includes an annular body and a sidewall connected to the annular body. The sidewall has a first through hole, and the magnet assembly has a first protrusion extending into the first through hole. And / or, the first magnet protrudes along the first direction away from the support plate on the side near the magnetic gap to form a second protrusion, and the housing is provided with a second through hole for avoiding the second protrusion, and the second through hole communicates with the magnetic gap.

6. The sound producing monomer of claim 1, wherein, The sound-generating unit also includes a centering support plate, which includes a first fixing part, a spring arm part, and a second fixing part. The first fixing part is disposed in the housing, the second fixing part is connected to the flat voice coil, and the two ends of the spring arm part are respectively connected to the first fixing part and the second fixing part.

7. The sound producing monomer of claim 6, wherein, The centering support includes two pieces, which are respectively located at both ends of the long side of the housing. The two centering support pieces are connected by a conductive connection part, which is also provided with an external solder pad that can be electrically connected to an external circuit.

8. The sound producing monomer of claim 6, wherein, The housing includes an annular body and a side wall connected to the annular body. The support plate includes a bottom plate and a surrounding plate. The magnet assembly is disposed on the bottom plate. The surrounding plate is connected to the side wall. The first fixing part is clamped between the surrounding plate and the side wall. And / or, the first fixing part is provided with an injection hole, and the housing is provided with an injection groove corresponding to the injection hole and communicating with the injection hole, the injection hole and the injection groove being used to hold glue; And / or, the first fixing part is provided with a first solder pad, and the housing is provided with a second solder pad that is soldered to the first solder pad; And / or, the vibration system further includes a support, the support including a body portion extending in a first direction, a first connecting portion and a second connecting portion located at both ends of the body portion in the first direction and bent in a second direction, and a third connecting portion extending from the inner end of the body portion in the first direction, the first connecting portion connecting to the reinforcing portion, the second connecting portion connecting to the second fixing portion, and the third connecting portion connecting to the side of the flat voice coil.

9. The sound producing monomer of claim 7, wherein, The conductive connection part and the centering support piece are integrally molded parts; And / or, the conductive connection portion includes a main body portion connecting the two centering support plates and an external connection portion connected to one end of the main body portion, the external connection portion being provided with the external solder pad, the main body portion being located on the side of the magnetic circuit system, and the outer surface of the main body portion not extending beyond the outer surface of the housing; And / or, the conductive connection part includes a main body part connecting the two centering support plates and an external connection part connected to one end of the main body part. The external connection part is provided with the external solder pad. The main body part is located on the side of the magnetic circuit system. The sound generating unit also includes a pressure plate. The pressure plate is connected to the housing. The main body part is located between the third magnet and the pressure plate. The outer surface of the pressure plate does not extend beyond the outer surface of the housing.

10. The sound producing monomer of claim 1, wherein, The sound-generating unit also includes a front cover, which is located on the side of the diaphragm away from the magnetic circuit system. The front cover has mesh openings. The sound-generating unit also includes a dustproof net, which covers the mesh openings.

11. The sound producing monomer of claim 10, wherein, The sound-generating unit also includes a waterproof sealing ring, which is connected to the side of the housing away from the magnetic circuit system. The waterproof sealing ring is arranged around the folded ring and forms an annular step at the connection with the folded ring. The front cover is disposed on the annular step and located inside the waterproof sealing ring. And / or, the mesh is of an irregular shape; And / or, the mesh includes a first hole and a second hole, wherein the first hole and the second hole have different hole areas; The first hole and the second hole are arranged alternately along the long or short side of the sound-emitting unit, or the first hole is scattered among the second holes, or the front cover includes a first region corresponding to the first hole and a second region corresponding to the second hole.

12. The sound producing monomer of any one of claims 1 to 11, wherein, The flat voice coil includes a first long axis segment and a second long axis segment arranged sequentially at intervals along the first direction. The first long axis segment is connected to the diaphragm. Both the first long axis segment and the second long axis segment extend along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The thickness of the first magnet along the first direction is not less than 80% of the height of the first long axis segment along the first direction. And / or, the thickness of the third magnet along the first direction is not less than 80% of the height of the second long axis segment along the first direction; And / or, the thickness of the first magnet and the third magnet along the first direction is greater than the thickness of the second magnet along the first direction.

13. The sound producing monomer of any one of claims 1 to 11, wherein, The aspect ratio of the inner diameter of the flat voice coil is no greater than 20:1; And / or, the aspect ratio of the sound-emitting unit is not greater than 10:1; And / or, the housing has a central portion and ends located at both ends of the central portion along the long side direction of the housing, the outer surface of the central portion protruding from the side away from the flat voice coil.

14. The sound producing monomer of any one of claims 1 to 11, wherein, The support plate has a clearance groove corresponding to the magnetic gap for avoiding the flat voice coil; Alternatively, the support plate may have an avoidance hole for avoiding the flat voice coil corresponding to the magnetic gap, and the sound-generating unit may also include a cover for covering the avoidance hole, the cover being disposed on the side of the support plate away from the magnet assembly along the first direction; And / or, the support plate includes a base plate, a surrounding plate disposed around the periphery of the base plate, and a first mounting ear and a second mounting ear disposed at both ends of the surrounding plate along a third direction. The first mounting ear is provided with a first mounting hole and a first positioning hole at intervals along the third direction. The second mounting ear is provided with a second mounting hole and a second positioning hole at intervals along the third direction. The second positioning hole extends through the outer edge of the second mounting ear along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

15. An electronic device, comprising: The electronic device includes a housing and a sound-emitting unit as described in any one of claims 1 to 14, the sound-emitting unit being disposed within the housing.

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