Sound production apparatus and sound production module

Abstract

The present invention relates to the technical field of electroacoustic transduction. Disclosed are a sound production apparatus and a sound production module. A housing of the sound production apparatus is provided with a sound outlet hole; a first diaphragm assembly of a vibration system comprises an inner surround, a first vibration plate, and an outer surround which are sequentially connected; the inner side of the inner surround is connected to a magnetic circuit system; the outer periphery of the outer surround is connected to the housing; one end of a voice coil is connected to the first vibration plate, and the other end of the voice coil is suspended in a magnetic gap; a separating membrane and a second diaphragm assembly are sequentially arranged on the side of the first diaphragm assembly facing the voice coil and are located on the outer side of the voice coil; and the outer edge of the separating membrane and the outer edge of the second diaphragm assembly are both connected to the housing, and the inner edge of the separating membrane and the inner edge of the second diaphragm assembly are both connected to the first diaphragm assembly, so as to form, between the separating membrane and the second diaphragm assembly, a sound production cavity communicated with the sound outlet hole. The sound production apparatus of the present invention allows for increase of the effective vibration area of the vibration system, thereby improving the acoustic performance.

Description

Sound production device and sound production module TECHNICAL FIELD

[0001] The present application relates to the technical field of electro-acoustic transduction, in particular to a sound production device and a sound production module applying the same. BACKGROUND

[0002] In recent years, with the rapid development of consumer electronics, people's requirements for electronic products are constantly improving, such as portability, comfort, etc. The sound production device is an important electro-acoustic transduction component in consumer electronics, which is widely used as a loudspeaker, earpiece, earphone, etc. With the improvement of the performance of electronic products, the improvement of the acoustic performance of the sound production device is also an inevitable trend.

[0003] The sound production device drives the diaphragm in the vibration system to vibrate through the magnetic circuit system, repeatedly pushes the air to realize sound production, and the diaphragm as the core component of the sound production device directly affects the acoustic performance of the sound production device. Among them, the effective vibration area (Sd) of the diaphragm is one of the important factors affecting the acoustic performance of the sound production device, the larger the effective vibration area of the diaphragm, the better the acoustic performance of the sound production device. However, the effective vibration area of the diaphragm of the sound production device in the related art is small, which affects the acoustic performance of the sound production device. SUMMARY

[0004] The main purpose of the present application is to provide a sound production device and a sound production module, which aims to provide a sound production device with increased effective vibration area, which increases the effective vibration area under the same amplitude conditions compared with conventional loudspeakers, improves the performance of the sound production device, and realizes the lightness and thinness of the product size under the same performance conditions.

[0005] To achieve the above purpose, the present application provides a sound production device, which comprises:

[0006] A shell provided with a sound outlet hole;

[0007] A magnetic circuit system connected to the shell, the magnetic circuit system being provided with a magnetic gap; and

[0008] A vibration system comprising a first diaphragm assembly, a second diaphragm assembly, a voice coil, and a diaphragm. The first diaphragm assembly includes an inner folded ring, a first diaphragm plate, and an outer folded ring connected in sequence. The inner side of the inner folded ring is connected to the magnetic circuit system, and the outer periphery of the outer folded ring is connected to the outer shell. One end of the voice coil is connected to the first diaphragm plate, and the other end of the voice coil is suspended within the magnetic gap. The diaphragm and the second diaphragm assembly are sequentially disposed on the side of the first diaphragm assembly facing the voice coil and located outside the voice coil. The outer edges of both the diaphragm and the second diaphragm assembly are connected to the outer shell, and the inner edges of both the diaphragm and the second diaphragm assembly are connected to the first diaphragm assembly, thereby forming a sound-generating cavity communicating with the sound outlet between the diaphragm and the second diaphragm assembly.

[0009] In one embodiment, the second diaphragm assembly includes a folded ring portion and a second vibrating plate. The outer periphery of the folded ring portion is connected to the housing. The second vibrating plate includes a main body portion connected to the inner edge of the folded ring portion and a first bent portion formed by bending and extending the main body portion toward the first diaphragm assembly. The first bent portion is connected to the inner edge of the first diaphragm assembly and / or the diaphragm.

[0010] In one embodiment, an inclined portion is formed at the connection between the main body and the first bent portion, and the inclined portion is set at an angle to the vibration direction of the vibration system;

[0011] And / or, the outer periphery of the folded ring is bent to form a first flange, and the first flange is connected to the outer wall of the outer shell.

[0012] In one embodiment, the magnetic circuit system includes a magnetic yoke and a central magnetic part and a side magnetic part disposed on the magnetic yoke. The side magnetic part is located outside the central magnetic part and forms the magnetic gap with the central magnetic part. The inner side of the inner folded ring is connected to the central magnetic part. The side magnetic part includes a plurality of side magnetic parts, and a clearance space is formed between two adjacent side magnetic parts.

[0013] The second diaphragm has a first extension extending into the clearance space, and the diaphragm has a second extension extending into the clearance space, with the second extension corresponding to and connected to the first extension; or, the voice coil has a first protrusion extending into the clearance space, and the central magnet has a second protrusion extending into the clearance space, with the first protrusion and the second protrusion disposed opposite to each other.

[0014] In one embodiment, the diaphragm is a flexible component, comprising an outer connecting portion, a deformable portion, and an inner connecting portion connected in sequence. The outer periphery of the outer connecting portion is connected to the outer shell, and the inner edge of the inner connecting portion is connected to the first diaphragm assembly and / or the first bending portion. The deformable portion is bent.

[0015] In one embodiment, the inner edge of the inner connecting portion extends along the inner surface of the first diaphragm assembly to form a second flange, and the first bent portion forms a straight section extending along the inner surface of the first diaphragm assembly at one end adjacent to the first diaphragm assembly.

[0016] Wherein, the second flange is sandwiched between the first diaphragm assembly and the straight section; or, the straight section is sandwiched between the second flange and the first diaphragm assembly; or, both the second flange and the straight section are connected to the first diaphragm assembly.

[0017] In one embodiment, along the vibration direction of the vibration system, the projected width L1 of the deformed portion is greater than or equal to the projected width L2 of the deformed segment of the folded ring portion, and the ratio of L1 to L2 is 1:1 to 3:1.

[0018] And / or, the deformable portion protrudes in a direction away from the first diaphragm assembly, the deformable segment of the folded ring protrudes in a direction close to the first diaphragm assembly, and the deformable portion and the deformable segment of the folded ring are misaligned in a direction perpendicular to the vibration system;

[0019] And / or, both the inner folded ring and the outer folded ring protrude in a direction away from the magnetic circuit system;

[0020] And / or, the compliance of the diaphragm is greater than or equal to the compliance of the folded portion.

[0021] In one embodiment, the effective vibration area Sd1 of the diaphragm is smaller than the effective vibration area Sd2 of the second diaphragm assembly.

[0022] In one embodiment, the ratio of Sd1 to Sd2 is 1:1.5 to 1:3.

[0023] In one embodiment, the first diaphragm plate bends and extends toward the voice coil to form a second bend, the second bend being connected to the voice coil; or, the first diaphragm assembly further includes a first support, the two ends of which are respectively connected to the first diaphragm plate and the voice coil.

[0024] And / or, the inner edge of the diaphragm and the inner edge of the second diaphragm assembly are both connected to the first vibrating plate; the first vibrating plate is provided with a protrusion facing toward the diaphragm, and the inner edge of the diaphragm and the inner edge of the second diaphragm assembly are both connected to the protrusion; or, the first diaphragm assembly further includes a second bracket, one end of the second bracket is connected to the first vibrating plate, and the other end of the second bracket is connected to the inner edge of the diaphragm and the inner edge of the second diaphragm assembly;

[0025] And / or, the outer periphery of the outer fold ring is bent and extended to form a third flange, which is connected to the outer wall of the outer shell.

[0026] In one embodiment, a first rear cavity is formed between the first diaphragm assembly and the diaphragm, and a second rear cavity is formed between the first diaphragm assembly, the second diaphragm assembly, the housing, and the magnetic circuit system.

[0027] The first vibrating plate has a protrusion that faces toward the diaphragm, and the inner edge of the diaphragm and the inner edge of the second diaphragm assembly are both connected to the protrusion.

[0028] The protrusion is provided with an airflow channel connecting the first rear cavity and the second rear cavity.

[0029] In one embodiment, the airflow channels include a plurality of channels, which are spaced apart along the protrusion.

[0030] And / or, the first diaphragm bends and extends toward the voice coil to form a second bend, the second bend being connected to the voice coil, and the second bend having a notch.

[0031] In one embodiment, the vibration system further includes a centering support, which includes an outer fixing part, an inner fixing part, and a vibration arm connecting the outer fixing part and the inner fixing part, wherein the outer fixing part is connected to the outer shell;

[0032] The second diaphragm assembly includes a folded ring portion and a second vibrating plate connected together. The outer periphery of the folded ring portion is connected to the outer shell, and the inner edge of the second vibrating plate is connected to the inner edge of the first diaphragm assembly and / or the diaphragm.

[0033] The inner fixing part is connected to the second diaphragm and the voice coil, and is electrically connected to the lead wire of the voice coil.

[0034] In one embodiment, the inner fixing portion includes a body portion and a third extension portion extending from the body portion toward the voice coil. The body portion is connected to the second diaphragm, and the third extension portion is connected to the voice coil. The third extension portion or the body portion is provided with an inner solder pad that is electrically connected to the lead wire of the voice coil.

[0035] And / or, the external fixing part is arranged in a ring shape, the external fixing part has alternating short axis side and long axis side, the vibration arm is led out from the side of the internal fixing part corresponding to the short axis side and bends and extends along the long axis side, and the vibration arm is connected to the central area of ​​the long axis side;

[0036] And / or, the centering support further includes a conductive part, one end of which is connected to the outer fixing part, and the other end of which extends in a direction away from the outer shell and is provided with an external solder pad.

[0037] In one embodiment, the magnetic circuit system includes a magnetic yoke and a central magnetic portion and a side magnetic portion disposed on the magnetic yoke. The side magnetic portion is located outside the central magnetic portion and forms the magnetic gap with the central magnetic portion. The central magnetic portion includes a first central magnet, a central magnetic plate and a second central magnet stacked together. The first central magnet is connected to the magnetic yoke, and the inner side of the inner folded ring is connected to the second central magnet.

[0038] The first central magnet and the second central magnet are both magnetized along the vibration direction of the vibration system, but in opposite directions.

[0039] In one embodiment, the vibration system further includes a centering support, which includes an outer fixing part, an inner fixing part, and a vibration arm connecting the outer fixing part and the inner fixing part. The outer fixing part is connected to the outer shell, and the inner fixing part is connected to the voice coil and electrically connected to the lead wire of the voice coil.

[0040] Wherein, the magnetic yoke is provided with a clearance structure corresponding to the inner fixing part, the clearance structure being a recessed groove or a through hole; and / or, the side magnetic part includes multiple parts, a clearance space is formed between two adjacent side magnetic parts, the voice coil has a first protrusion extending to the clearance space, and the first protrusion is connected to the inner fixing part;

[0041] And / or, the edge magnetic part includes an edge magnet and an edge magnetic plate stacked together, the edge magnet is connected to the magnetic yoke, the edge magnetic plate is disposed opposite to the central magnetic plate, and the magnetization direction of the edge magnet is opposite to the magnetization direction of the first central magnet.

[0042] In one embodiment, the outer casing includes a first casing and a second casing. The first casing is provided with the sound outlet. The outer periphery of the outer folding ring and the outer periphery of the diaphragm are both connected to the first casing. The magnetic circuit system is connected to the second casing. The outer periphery of the second diaphragm assembly is sandwiched between the first casing and the second casing.

[0043] In one embodiment, the first housing has a sidewall and an inner bend formed by bending and extending the sidewall toward the inward from one end away from the second housing. The outer periphery of the outer fold ring and the diaphragm are both connected to the inner bend. The outer periphery of the second diaphragm assembly is sandwiched between the end of the sidewall away from the inner bend and the second housing.

[0044] The sound outlet is located on the side wall or the inner bend.

[0045] In one embodiment, the inner bend includes an upper surface, a lower surface, and an inner surface, the upper surface and the lower surface being disposed opposite to each other, and the inner surface connecting the upper surface and the lower surface and located at the end of the inner bend away from the sidewall;

[0046] The outer periphery of the outer fold ring is connected to the upper surface, and the outer periphery of the diaphragm is connected to the lower surface; or, the outer periphery of the outer fold ring is connected to the upper surface, and the outer periphery of the diaphragm is sandwiched between the outer periphery of the outer fold ring and the upper surface.

[0047] In one embodiment, the first housing is a metal housing, and the second housing is a metal housing;

[0048] The first housing has a welding portion extending toward the magnetic circuit system, the welding portion being welded to the magnetic circuit system or the second housing; and / or, the magnetic circuit system or the second housing has a welding portion extending toward the first housing, the welding portion being welded to the outer wall of the first housing; and / or, the sound-generating device further includes a metal welding piece, one end of the metal welding piece being welded to the magnetic circuit system or the second housing, and the other end of the metal welding piece being welded to the outer wall of the first housing;

[0049] And / or, the second housing and the magnetic yoke of the magnetic circuit system are integrally formed;

[0050] And / or, the vibration system further includes a centering support, the centering support including an outer fixing part, an inner fixing part and a vibration arm connecting the outer fixing part and the inner fixing part, the outer fixing part being sandwiched between the outer periphery of the second housing and the second diaphragm assembly, the inner fixing part being connected to the voice coil and electrically connected to the lead wire of the voice coil.

[0051] The present invention also proposes a sound-generating module, the sound-generating module comprising:

[0052] A module housing, the module housing having a mounting cavity and a sound outlet communicating with the mounting cavity; and

[0053] The aforementioned sound-generating device is disposed in the mounting cavity, and a front sound cavity is formed between the first diaphragm assembly of the sound-generating device and the module housing, and the front sound cavity is connected to the sound outlet;

[0054] Wherein, the sound-generating cavity of the sound-generating device is connected to the sound outlet through the front sound cavity; or, the module housing is further provided with a sound outlet channel, and the sound-generating cavity of the sound-generating device is connected to the sound outlet through the sound outlet channel; or, the sound outlet hole of the sound-generating device is directly connected to the sound outlet.

[0055] The sound-generating device of this invention houses a magnetic circuit system and a vibration system within a shell. A magnetic gap is provided in the magnetic circuit system, and the vibration system comprises a first diaphragm assembly, a second diaphragm assembly, a voice coil, and a diaphragm. The inner side of the inner folded ring of the first diaphragm assembly is connected to the magnetic circuit system, and the outer periphery of the outer folded ring is connected to the shell. One end of the voice coil is connected to the first diaphragm assembly, and the other end is suspended within the magnetic gap. When current is passed through the voice coil, it converts electrical energy into mechanical energy within the magnetic gap, driving the voice coil to vibrate the first diaphragm assembly, thus generating sound. Simultaneously, the diaphragm and the second diaphragm assembly are sequentially positioned below the first diaphragm assembly and outside the voice coil. The first diaphragm assembly consists of an inner folded ring, a first diaphragm plate, and an outer folded ring connected in sequence. The inner side of the inner folded ring is connected to the magnetic circuit system, and the outer periphery of the outer folded ring is suspended within the magnetic gap. The diaphragm and the outer shell are connected, thus connecting one end of the voice coil to the first diaphragm plate and the other end of the voice coil to the magnetic gap. The outer edges of the diaphragm and the second diaphragm assembly are both connected to the outer shell, and the inner edges of the diaphragm and the second diaphragm assembly are both connected to the first diaphragm assembly, forming a sound cavity between the diaphragm and the second diaphragm assembly. A sound outlet is provided in the outer shell, so that the sound cavity is connected to the sound outlet. This allows the voice coil to drive the diaphragm and the second diaphragm assembly to vibrate through the first diaphragm assembly. In this way, a diaphragm and a second diaphragm assembly are added to the conventional loudspeaker. When the sound-generating device is working, the voice coil drives the diaphragm and the second diaphragm assembly to vibrate through the first diaphragm assembly, causing a relative change in the volume between the diaphragm and the second diaphragm assembly. This pushes the air in the sound cavity to flow smoothly through the sound outlet, thereby increasing the effective vibration area when the sound-generating device vibrates and thus improving the performance of the sound-generating device. Attached Figure Description

[0056] 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.

[0057] Figure 1 is a structural schematic diagram of an embodiment of the sound-generating device provided by the present invention;

[0058] Figure 2 is an exploded view of an embodiment of the sound-generating device provided by the present invention;

[0059] Figure 3 is a cross-sectional schematic diagram of an embodiment of the sound-generating device provided by the present invention;

[0060] Figure 4 is a cross-sectional schematic diagram from another perspective of an embodiment of the sound-generating device provided by the present invention;

[0061] Figure 5 is a partial top view of an embodiment of the sound-generating device provided by the present invention.

[0062] Figure 6 is a top view of the magnetic circuit system connected to the centering support and voice coil in one embodiment of the sound-generating device provided by the present invention.

[0063] Figure 7 is an exploded schematic diagram of the magnetic circuit system in one embodiment of the present invention;

[0064] Figure 8 is an exploded view of the first diaphragm assembly in one embodiment of the present invention;

[0065] Figure 9 is a schematic diagram of the structure of the first vibration plate in an embodiment of the present invention;

[0066] Figure 10 is a schematic diagram of the structure of the second vibration plate in one embodiment of the present invention;

[0067] Figure 11 is a schematic diagram of the structure of the second vibration plate in another embodiment of the present invention;

[0068] Figure 12 is a schematic diagram of the diaphragm structure in one embodiment of the present invention;

[0069] Figure 13 is a schematic diagram of the diaphragm structure in another embodiment of the present invention;

[0070] Figure 14 is a schematic diagram of the centering support plate in one embodiment of the present invention;

[0071] Figure 15 is a cross-sectional schematic diagram of an embodiment of the sound-generating module provided by the present invention;

[0072] Figure 16 is a cross-sectional schematic diagram from another perspective of an embodiment of the sound-generating module provided by the present invention.

[0073] Explanation of reference numerals in the attached diagram: 100, sound-generating device; 1, outer casing; 11, first casing; 111, sound outlet; 112, side wall; 113, inner bend; 12. Second housing; 121. Welding part; 2. Magnetic circuit system; 21. Magnetic yoke; 211. Clearance structure; 22. Central magnetic part; 221. First central magnet; 222. Central magnetic plate; 223. Second central magnet; 224. Second protrusion; 23. Side magnetic part; 231. Side magnet; 232. Side magnetic plate; 233. Clearance space; 24. Magnetic gap; 3. Vibration system; 31. First diaphragm assembly; 311. Inner fold ring; 312. First vibrating plate; 3121. Second bending part; 3122. Protrusion; 3123. Airflow channel; 3124. Notch; 313. Outer fold ring; 3131. Third flange; 32. Second diaphragm assembly; 321. Fold ring part; 322. Second vibrating plate; 32 21. Main body; 3222. First bending section; 3223. Inclined section; 3224. First extension section; 3225. Straight section; 33. Voice coil; 331. First protrusion; 34. Diaphragm; 341. External connecting section; 342. Deformation section; 343. Internal connecting section; 3431. Second flange; 344. Second extension section; 35. Centering support plate; 351. External fixing section; 352. Internal fixing section; 3521. Main body; 3522. Third extension section; 3523. Inner solder pad; 353. Vibrating arm; 354. Conductive part; 41. Sound chamber; 42. First rear chamber; 43. Second rear chamber; 500. Module housing; 510. Mounting cavity; 520. Sound outlet; 530. Front sound chamber; 600. Sound module.

[0074] 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

[0075] 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.

[0076] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0077] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or, B" as an example, it includes option A, option B, or option A and B are satisfied at the same time.

[0078] Furthermore, in this invention, descriptions involving "first," "second," etc., 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. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0079] In recent years, with the rapid development of consumer electronics, people's requirements for electronic products have been continuously improving. In addition to the differences in product performance, portability and comfort are some of the key aspects that people pay attention to. Currently, conventional speaker solutions in electronic products are difficult to simultaneously meet multiple design requirements such as high performance and thinness.

[0080] Sound-generating devices are crucial electroacoustic transducers in consumer electronics, widely used as speakers, earpieces, and headphones. As electronic products improve in performance, improvements in the acoustic performance of sound-generating devices are an inevitable trend.

[0081] The sound-generating device in this technology includes a frame, a vibrating system fixed to the frame, and a magnetic circuit system with a magnetic gap. The magnetic circuit system drives the vibrating system to vibrate and produce sound. The vibrating system includes a diaphragm fixed to the frame for vibrating and producing sound, a dome attached to the diaphragm, and a voice coil inserted into the magnetic gap and connected to the dome to drive the diaphragm to vibrate. In other words, the sound-generating device drives the diaphragm in the vibrating system to vibrate through the magnetic circuit system, repeatedly pushing air to produce sound. As the core component of the sound-generating device, the diaphragm directly affects the acoustic performance of the device. The effective vibrating area (Sd) of the diaphragm is one of the important factors affecting the acoustic performance of the sound-generating device; the larger the effective vibrating area of ​​the diaphragm, the better the acoustic performance of the sound-generating device.

[0082] However, in the sound-generating devices of the related technologies, the vibration system and the magnetic circuit system are stacked one on top of the other. In sound-generating devices of the same height, this restricts the structure of the magnetic circuit system, thereby limiting the BL value of its magnetic field. In addition, the effective vibration area of ​​the diaphragm in the sound-generating devices of the related technologies is small, which affects the acoustic performance of the sound-generating devices.

[0083] Based on the above concepts and problems, this invention proposes a sound-generating device 100. It is understood that the sound-generating device 100 is applied to electronic devices, such as mobile phones, headphones, smart wearable devices, etc., and is not limited thereto. In this embodiment, the sound-generating device 100 of this invention adds a diaphragm 34 and a second diaphragm assembly 32 to a conventional loudspeaker. By utilizing the relative volume change between the diaphragm 34 and the second diaphragm assembly 32 during the operation of the sound-generating device 100 to push air, the effective vibration area of ​​the sound-generating device 100 during vibration is increased, thereby improving the performance of the sound-generating device 100.

[0084] Understandably, the sound-generating device 100 of the present invention increases the effective vibration area (Sd) by increasing the Z-axis space of the sound-generating device 100, thereby increasing the effective vibration area (Sd) of the sound-generating device 100. This also compensates for the loss of Sd in the first diaphragm assembly 31 caused by the addition of a magnet to the intermediate magnetic circuit of the magnetic circuit system. Furthermore, the addition of a magnet to the intermediate magnetic circuit increases the magnetic field strength of the magnetic gap 24, thereby improving the performance of the sound-generating device 100. The sound-generating device 100 of the present invention also achieves a high-performance, lightweight solution. Compared with conventional loudspeakers, the performance of the sound-generating device 100 is improved under the same amplitude conditions. It also achieves a reduction in the amplitude of the sound-generating device 100 while maintaining the same performance, resulting in a thinner and lighter product size.

[0085] Referring to Figures 1 to 14, in this embodiment of the invention, the sound-generating device 100 includes a housing 1, a magnetic circuit system 2, and a vibration system 3. The housing 1 has a sound outlet 111. The magnetic circuit system 2 is connected to the housing 1 and has a magnetic gap 24. The vibration system 3 includes a first diaphragm assembly 31, a second diaphragm assembly 32, a voice coil 33, and a diaphragm 34. The first diaphragm assembly 31 includes an inner folded ring 311, a first vibrating plate 312, and an outer folded ring 313 connected in sequence. The inner side of the inner folded ring 311 is connected to the magnetic circuit system 2, and the outer folded ring 313... The outer periphery is connected to the outer shell 1. One end of the voice coil 33 is connected to the first diaphragm plate 312, and the other end of the voice coil 33 is suspended in the magnetic gap 24. The diaphragm 34 and the second diaphragm assembly 32 are sequentially disposed on the side of the first diaphragm assembly 31 facing the voice coil 33 and located outside the voice coil 33. The outer edges of the diaphragm 34 and the second diaphragm assembly 32 are both connected to the outer shell 1. The inner edges of the diaphragm 34 and the second diaphragm assembly 32 are both connected to the first diaphragm assembly 31, so as to form a sound cavity 41 communicating with the sound outlet 111 between the diaphragm 34 and the second diaphragm assembly 32.

[0086] In this embodiment, the sound-generating device 100 can be a single unit of a loudspeaker, and the loudspeaker can be a miniature loudspeaker. It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 are arranged opposite to each other.

[0087] Optionally, the magnetic circuit system 2 is arranged in a square shape. In this embodiment, the vibration system 3 is optionally arranged in a square shape. It is understood that the periphery of the first diaphragm assembly 31 of the vibration system 3 may be connected to the magnetic circuit system 2, or the magnetic circuit system 2 and the vibration system 3 may be respectively mounted on the speaker housing, etc., which are not limited here.

[0088] In this embodiment, as shown in Figures 2 to 7, the magnetic circuit system 2 includes a magnetic yoke 21 and a central magnetic portion 22 and a side magnetic portion 23 disposed on the magnetic yoke 21. The side magnetic portion 23 is located outside the central magnetic portion 22 and forms a magnetic gap 24 with the central magnetic portion 22. Optionally, both the central magnetic portion 22 and the side magnetic portion 23 of the magnetic circuit system 2 can be square structures.

[0089] To better assemble the magnetic circuit system 2 and vibration system 3 of the sound-generating device 100, in one embodiment, as shown in Figures 1 to 4, the sound-generating device 100 further includes a housing 1, to which both the magnetic circuit system 2 and the vibration system 3 are connected. Specifically, the magnetic yoke 21 of the magnetic circuit system 2 is connected to one end of the housing 1, and the periphery of the first diaphragm assembly 31 of the vibration system 3 is connected to the other end of the housing 1 and is disposed opposite to the magnetic circuit system 2, with the inner periphery of the first diaphragm assembly 31 connected to the magnetic circuit system 2. Optionally, the inner periphery of the first diaphragm assembly 31 is connected to the central magnet 22.

[0090] 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 a mounting base for components such as the magnetic circuit system 2 and the vibration system 3. It is understood that the outer shell 1 can be a single integral structure or formed by the cooperation of multiple separate structures; no limitation is made here. In this embodiment, the outer shell 1 can be a square frame or a frame structure, that is, the outer shell 1 has a cavity with openings at both ends. The magnetic circuit system 2 and the vibration system 3 are respectively connected to the two sides of the outer shell 1, so that the magnetic circuit system 2, the outer shell 1, and the first diaphragm assembly 31 of the vibration system 3 enclose and form a vibration cavity.

[0091] In this embodiment, the outer shell 1 is used to house structures such as the fixed vibration system 3 and the magnetic circuit system 2, so that the sound generating device 100 can be used as an independent component in electronic devices or sound generating modules, which is not limited here.

[0092] Understandably, by configuring the magnetic circuit system 2 as a magnetic yoke 21 and a central magnetic part 22 and a side magnetic part 23 disposed on the magnetic yoke 21, the magnetic circuit system 2 can be connected to the outer shell 1 through the periphery of the magnetic yoke 21. In this embodiment, the side magnetic part 23 is disposed outside the central magnetic part 22 and forms a magnetic gap 24 with the central magnetic part 22. This allows the first diaphragm assembly 31 of the vibration system 3 to be connected to the end of the outer shell 1 away from the magnetic yoke 21, the inner side of the first diaphragm assembly 31 to be connected to the central magnetic part 22, and one end of the voice coil 33 to be connected to the first diaphragm assembly 31. The other end of the voice coil 33 is suspended in the magnetic gap 24. Thus, current is passed through the voice coil 33, causing the voice coil 33 to convert electrical energy into mechanical energy within the magnetic gap 24 formed by the magnetic circuit system 2, thereby driving the voice coil 33 to vibrate the first diaphragm assembly 31 and thus producing sound.

[0093] In one embodiment, the central magnetic part 22 includes a first central magnet 221, a central magnetic plate 222 and a second central magnet 223 stacked together. The first central magnet 221 is connected to the magnetic yoke 21, and the inner side of the inner folding ring 311 is connected to the second central magnet 223. The first central magnet 221 and the second central magnet 223 are both magnetized along the vibration direction of the vibration system 3 and the magnetization directions are opposite.

[0094] In this embodiment, as shown in Figures 2 to 7, by setting the central magnetic part 22 as a magnetically opposed structure, the first central magnet 221, the central magnetic guide plate 222, and the second central magnet 223 of the central magnetic part 22 are stacked sequentially on the magnetic yoke 21 in the vertical direction. The first central magnet 221 and the second central magnet 223 are both magnetized along the vibration direction of the vibration system 3, and the magnetization direction of the first central magnet 221 is opposite to that of the second central magnet 223. In this way, by utilizing the magnetic guiding effect of the central magnetic guide plate 222, the magnetic field lines of the first central magnet 221 and the second central magnet 223 are concentrated on the central magnetic guide plate 222 and transmitted to the magnetic gap 24 by the central magnetic guide plate 222. This allows the central magnetic part 22 to generate a magnetic field with a strong magnetic field strength that passes through the magnetic gap 24, thereby increasing the magnetic flux density of the magnetic gap 24, increasing the number of magnetic field lines passing through the voice coil 33, increasing the magnetic force on the voice coil 33, and effectively improving the BL value.

[0095] Understandably, by configuring the first diaphragm assembly 31 as an inner folded ring 311, a first diaphragm plate 312, and an outer folded ring 313 connected in sequence, the inner side of the inner folded ring 311 is connected to the second central magnet 223 of the central magnet part 22, and the outer periphery of the outer folded ring 313 is connected to the outer shell 1, thereby achieving a fixed connection of the first diaphragm assembly 31. At the same time, the inner folded ring 311 and the outer folded ring 313 improve the vibration performance and compliance of the first diaphragm assembly 31. Optionally, the first diaphragm plate 312 is connected to the voice coil 33; or, the first diaphragm plate 312 is connected to the voice coil 33 through a connector or a frame, which is not limited here.

[0096] Optionally, the first vibrating plate 312 is made of metal or fiber. In this embodiment, the vibrating plate is bonded to the outer folding ring 313 and the inner folding ring 311 respectively, or integrally injection molded. It should be noted that the inner folding ring 311, the first vibrating plate 312, and the outer folding ring 313 of the first diaphragm assembly 31 can also be integrally molded, which can ensure the structural strength of the first diaphragm assembly 31 and simplify the processing steps, and is not limited here.

[0097] In this embodiment, a first stepped surface is formed on the outer periphery of the first vibrating plate 312, and a second stepped surface is formed on the inner periphery of the first vibrating plate 312; an inner ring portion is formed on the inner side of the outer folded ring 313 along the vibration direction perpendicular to the vibration system 3, and an outer ring portion is formed on the outer side of the inner folded ring 311 along the vibration direction perpendicular to the vibration system 3; wherein, the inner ring portion overlaps with the first stepped surface and is bonded to the first stepped surface, and the outer ring portion overlaps with the second stepped surface and is bonded to the second stepped surface.

[0098] Understandably, the first vibrating plate 312 is bonded to the outer folded ring 313 and the inner folded ring 311 respectively, which not only improves the connection stability but also makes the assembly structure more compact and ensures the vibration performance of the entire first diaphragm assembly 31. Of course, in other embodiments, the inner ring portion of the outer folded ring 313 and the outer ring portion of the inner folded ring 311 can be simultaneously connected to the same side of the first vibrating plate 312 (e.g., the upper surface or the lower surface of the first vibrating plate 312) or the inner ring portion of the outer folded ring 313 and the outer ring portion of the inner folded ring 311 can be connected to different sides of the first vibrating plate 312, which is not limited here.

[0099] In this embodiment, as shown in Figures 1 to 4 and Figure 8, the inner folding ring 311 of the first diaphragm assembly 31 can be a sealed structure, that is, the inner side of the inner folding ring 311 is a flat plate, and the flat plate-shaped inner side of the inner folding ring 311 is connected and attached to the side of the central magnetic part 22 of the magnetic circuit system 2 facing away from the magnetic yoke 21.

[0100] Of course, in other embodiments, the first diaphragm assembly 31 may be an annular structure. It is understood that the inner side of the inner folded ring 311 is provided with a hollow hole, and part of the central magnet 22 is exposed in the hollow hole or part of the central magnet 22 is inserted into the hollow hole, which is not limited here.

[0101] In this embodiment, the outer fold 313 and inner fold 311 of the first diaphragm assembly 31 can be either an upwardly convex structure or a downwardly concave structure, which is not limited here. To avoid obstructing the diaphragm 34 and the second diaphragm assembly 32, the outer fold 313 of the first diaphragm assembly 31 may optionally convex in a direction away from the magnetic circuit system 2. It is understood that to avoid interference between the inner fold 311 of the first diaphragm assembly 31 and the central magnetic portion 22 of the magnetic circuit system 2 during vibration, the inner fold 311 of the first diaphragm assembly 31 may optionally convex in a direction away from the magnetic circuit system 2. Optionally, both the inner fold 311 and the outer fold 313 may convex in a direction away from the magnetic circuit system 2.

[0102] To further increase the connection area between the outer folding ring 313 of the first diaphragm assembly 31 and the outer shell 1, and to improve stability, in this embodiment, as shown in Figures 1 to 4 and Figure 8, the outer periphery of the outer folding ring 313 is bent and extended to form a third flange 3131, which is connected to the outer wall of the outer shell 1. It is understood that the outer periphery of the outer folding ring 313 has a straight portion parallel to the first vibrating plate 312, which is connected to the end face of the outer shell 1. The third flange 3131 is formed by bending and extending from the outer side of the straight portion towards the direction close to the magnetic circuit system 2, thereby connecting the third flange 3131 to the outer wall of the outer shell 1, thus increasing the connection area with the outer shell 1 and improving connection stability and waterproof sealing performance.

[0103] To achieve electrical connection between the voice coil 33 and the external circuit, in one embodiment, as shown in Figures 2 to 6 and Figure 14, the vibration system 3 further includes a centering support 35. One end of the centering support 35 is connected to the voice coil 33 and is connected to the lead wire of the voice coil 33 for conduction, while the other end of the centering support 35 is connected to the outer casing 1.

[0104] Understandably, the two ends of the centering support 35 are electrically connected to the leads of the voice coil 33 and the external circuit, respectively. In this embodiment, the centering support 35 can be disposed at the bottom of the voice coil 33, or located at one of the four corners of the sound-generating device 100, or along the short or long axis of the sound-generating device 100. Of course, the centering support 35 can also be disposed at the top of the voice coil 33, or located between the voice coil 33 and the diaphragm 31; this is not limited here.

[0105] In this embodiment, the diaphragm 34 and the second diaphragm assembly 32 of the vibration system 3 are sequentially disposed on the side of the first diaphragm assembly 31 facing the magnetic yoke 21 and located outside the voice coil 33. That is, the diaphragm 34 and the second diaphragm assembly 32 are sequentially disposed below the first diaphragm assembly 31, so that the outer edges of the diaphragm 34 and the second diaphragm assembly 32 are connected to the outer shell 1, and the inner edges of the diaphragm 34 and the second diaphragm assembly 32 are connected to the first diaphragm assembly 31, so as to form a sound cavity 41 between the diaphragm 34 and the second diaphragm assembly 32. A sound outlet 111 is provided on the outer shell 1 so that the sound cavity 41 is connected to the sound outlet 111. In this way, the voice coil 33 drives the diaphragm 34 and the second diaphragm assembly 32 to vibrate through the first diaphragm assembly 31.

[0106] Optionally, the inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32 are both connected to the first diaphragm plate 312, thereby increasing the connection strength between the diaphragm 34, the second diaphragm assembly 32 and the first diaphragm assembly 31. This allows the voice coil 33 to drive the diaphragm 34 and the second diaphragm assembly 32 to vibrate through the first diaphragm plate 312 of the first diaphragm assembly 31.

[0107] Understandably, when current is passed through the voice coil 33, the voice coil 33 converts electrical energy into mechanical energy within the magnetic gap 24 formed by the magnetic circuit system 2, thereby driving the voice coil 33 to vibrate the first diaphragm assembly 31 and thus producing sound. At the same time, the voice coil 33 drives the diaphragm 34 and the second diaphragm assembly 32 to vibrate through the first vibrating plate 312, thereby causing a relative change in the volume between the diaphragm 34 and the second diaphragm assembly 32 to facilitate the smooth flow of air in the sound cavity 41 through the sound outlet 111. At this time, the sound-producing device 100 adds a diaphragm 34 and a second diaphragm assembly 32 to the conventional loudspeaker. When the sound-producing device 100 is working, the voice coil 33 simultaneously drives the first diaphragm assembly 31, the second diaphragm assembly 32 and the diaphragm 34 to vibrate, thereby increasing the effective vibration area of ​​the sound-producing device 100 and improving the performance of the sound-producing device 100.

[0108] In this embodiment, the structure of the second diaphragm assembly 32 can be a diaphragm structure or other structures capable of vibrating and producing sound, and is not limited here. The structure of the diaphragm 34 can be a structure capable of vibrating and deforming; optionally, the diaphragm 34 is a flexible component. The diaphragm 34 is made of flexible materials such as a single-layer PEEK (polyether ether ketone) membrane or a composite PEEK (polyether ether ketone) membrane. It is understood that by connecting the inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32 to the first vibrating plate 312, the voice coil 33 drives the diaphragm 34 and the second diaphragm assembly 32 to vibrate through the first vibrating plate 312. The first vibrating plate 312 can be made of metal materials such as stainless steel or other materials with a certain strength such as carbon fiber, and is not limited here.

[0109] It should be noted that the sound-generating cavity 41 formed between the diaphragm 34 and the second diaphragm assembly 32 is a sealed front cavity. When the sound-generating device 100 is working, the vibration directions of the first diaphragm assembly 31 and the second diaphragm assembly 32 are the same. The volume change of the sound-generating cavity 41 increases the volume of air pushed during operation, thereby increasing the effective vibration area of ​​the product. At the same time, by setting the diaphragm 34 and the second diaphragm assembly 32, the sound-generating device 100 can increase its effective vibration area by utilizing its own Z-axis space, thereby increasing the Sd of the sound-generating device 100 and reducing the Sd loss caused by the connection between the inner folded ring 311 of the first diaphragm assembly 31 and the central magnet 22, thereby improving the performance of the sound-generating device 100.

[0110] Optionally, the effective vibration area Sd1 of the diaphragm 34 is smaller than the effective vibration area Sd2 of the second diaphragm assembly 32. In this embodiment, the ratio of Sd1 to Sd2 is 1:1.5 to 1:3. Optionally, the ratio of the effective vibration area Sd1 of the diaphragm 34 to the effective vibration area Sd2 of the second diaphragm assembly 32 can be 1:1.5, 1:1.8, 1:2, 1:2.3, 1:2.5, 1:2.8, 1:3, etc., and is not limited here.

[0111] Understandably, this setup allows the diaphragm 34 to vibrate and the second diaphragm assembly 32 to vibrate via the first vibrating plate 312. The diaphragm 34 vibrates and deforms, causing it to have a counter-effect on pushing the air volume, while the second diaphragm assembly 32 has a positive effect on pushing the air volume. By utilizing the volume change of the sound cavity 41, the volume of air pushed during operation is increased, thereby increasing the effective vibration area of ​​the product.

[0112] The sound-generating device 100 of the present invention houses a magnetic circuit system 2 and a vibration system 3 within a housing 1. The magnetic circuit system 2 is configured as a magnetic yoke 21, with a central magnetic portion 22 and a side magnetic portion 23 disposed on the yoke 21. The side magnetic portion 23 is located outside the central magnetic portion 22 and forms a magnetic gap 24 with the central magnetic portion 22. The vibration system 3 comprises a first diaphragm assembly 31, a second diaphragm assembly 32, a voice coil 33, and a diaphragm 34. The inner side of the inner folded ring 311 of the first diaphragm assembly 31 is connected to the central magnetic portion 22 of the magnetic circuit system 2. The outer periphery of the folded ring 313 is connected to the outer shell 1. One end of the voice coil 33 is connected to the first diaphragm assembly 31, and the other end of the voice coil 33 is suspended in the magnetic gap 24. When current is passed through the voice coil 33, it converts electrical energy into mechanical energy within the magnetic gap 24 formed by the magnetic circuit system 2, driving the voice coil 33 to vibrate the first diaphragm assembly 31, thereby producing sound. Simultaneously, the diaphragm 34 and the second diaphragm assembly 32 are sequentially positioned on the side of the first diaphragm assembly 31 facing the magnetic yoke 21 and located outside the voice coil 33, so that the diaphragm 34... 4. The outer edges of the second diaphragm assembly 32 are both connected to the outer shell 1, and the inner edges of the diaphragm 34 and the second diaphragm assembly 32 are both connected to the first diaphragm assembly 31, so as to form a sound-generating cavity 41 between the diaphragm 34 and the second diaphragm assembly 32. A sound outlet 111 is provided on the outer shell 1, so that the sound-generating cavity 41 is connected to the sound outlet 111, so that the voice coil 33 drives the diaphragm 34 and the second diaphragm assembly 32 to vibrate through the first vibrating plate 312. In this way, a diaphragm 34 and a second diaphragm assembly 32 are added to the basis of a conventional loudspeaker, and the sound-generating device 1 is used. When the sound-generating device 100 is in operation, the voice coil 33 drives the diaphragm 34 and the second diaphragm assembly 32 to vibrate through the first diaphragm assembly 31, causing a relative change in the volume between the diaphragm 34 and the second diaphragm assembly 32 to promote the smooth flow of air in the sound-generating cavity 41 through the sound outlet 111, thereby increasing the effective vibration area of ​​the sound-generating device 100 and improving the performance of the sound-generating device 100; furthermore, by making the central magnetic part 22 a magnetic pair structure, the magnetic field strength of the magnetic circuit system 2 of the sound-generating device 100 can be increased, thus improving the overall performance of the sound-generating device 100.

[0113] In one embodiment, the first diaphragm 312 bends and extends toward the voice coil 33 to form a second bend 3121, and the second bend 3121 is connected to the voice coil 33.

[0114] In this embodiment, as shown in Figures 2 to 4, 8 and 9, a second bend 3121 is provided on the first diaphragm 312, extending towards the voice coil 33. This allows the first diaphragm 312 to be connected to the voice coil 33 via the second bend 3121, thereby suspending the voice coil 33 in a more reasonable position within the magnetic gap 24 using the second bend 3121, ensuring the effectiveness of the magnetic circuit system 2 in driving the voice coil 33 to vibrate.

[0115] Understandably, the second bending portion 3121 is formed by bending and extending the inner side of the first diaphragm 312 toward the direction close to the voice coil 33. Optionally, the first diaphragm 312 and the second bending portion 3121 are integrally formed, such as integral injection molding or integral stamping, etc., which is not limited here.

[0116] Optionally, the second bending portion 3121 can be an integrally bent annular structure, such that the end face of the voice coil 33 adjacent to the first diaphragm 312 is connected to the second bending portion 3121. Alternatively, multiple second bending portions 3121 may be provided, spaced apart, with the corresponding voice coil 33 configured as an annular structure, such that multiple second bending portions 3121 are all connected to the end face of the voice coil 33 adjacent to the first diaphragm 312. This is not limited in this respect.

[0117] In another embodiment, the first diaphragm assembly 31 further includes a first bracket, the two ends of which are connected to the first diaphragm plate 312 and the voice coil 33, respectively. It is understood that the first bracket can be connected to the first diaphragm plate 312 by bonding, welding, or integral injection molding, so that the first diaphragm plate 312 is connected to the voice coil 33 through the first bracket. This allows the voice coil 33 to be suspended at a reasonable position within the magnetic gap 24 using the first bracket, ensuring the effectiveness of the magnetic circuit system 2 in driving the voice coil 33 to vibrate.

[0118] Optionally, the first support forms an annular structure, such that the end face of the voice coil 33 adjacent to the first diaphragm 312 is connected to the first support. Alternatively, the first support may include multiple supports, which are spaced apart, and the corresponding voice coil 33 is configured as an annular structure, such that the multiple first supports are connected to the end face of the voice coil 33 adjacent to the first diaphragm 312. This is not limited here.

[0119] In one embodiment, the inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32 are both connected to the first vibrating plate 312. The first vibrating plate 312 is provided with a protrusion 3122 that approaches the diaphragm 34. The inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32 are both connected to the protrusion 3122.

[0120] In this embodiment, as shown in Figures 2 to 4, 8 and 9, a protrusion 3122 is provided on the first vibrating plate 312, extending towards the diaphragm 34. This allows the first vibrating plate 312 to connect with the inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32 through the protrusion 3122. The protrusion 3122 supports the diaphragm 34 and the second diaphragm assembly 32 away from the first diaphragm assembly 31, effectively preventing interference between the diaphragm 34 and the second diaphragm assembly 32 and the first diaphragm assembly 31, thus ensuring the vibration effect.

[0121] Understandably, the protrusion 3122 is formed by bending and extending the inner side of the first vibrating plate 312 toward the direction close to the diaphragm 34. Optionally, the first vibrating plate 312 and the protrusion 3122 are integrally formed, such as integral injection molding or integral stamping, etc., which is not limited here. In this embodiment, as shown in Figures 2, 8 and 9, the side of the first vibrating plate 312 facing away from the diaphragm 34 is recessed toward the side close to the diaphragm 34, so as to form the protrusion 3122 on the side of the first vibrating plate 312 facing the diaphragm 34, which is not limited here.

[0122] Optionally, the protrusion 3122 may be an integral annular structure; or, the protrusion 3122 may include multiple protrusions 3122, which are spaced apart and form an annular structure, without limitation.

[0123] In another embodiment, the first diaphragm assembly 31 further includes a second support, one end of which is connected to the first vibrating plate 312, and the other end of which is connected to the inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32.

[0124] Understandably, the second bracket can be connected to the first vibrating plate 312 by means of bonding, welding or integral injection molding, so that the first vibrating plate 312 is connected to the inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32 through the second bracket. In this way, the second bracket supports the diaphragm 34 and the second diaphragm assembly 32 away from the first diaphragm assembly 31, effectively avoiding interference between the diaphragm 34 and the second diaphragm assembly 32 and the first diaphragm assembly 31, so as to ensure the vibration effect.

[0125] Optionally, the second support forms a ring structure; or, the second support may include multiple second supports, which are spaced apart and form a ring structure, without limitation.

[0126] In one embodiment, a first rear cavity 42 is formed between the first diaphragm assembly 31 and the diaphragm 34, and a second rear cavity 43 is formed between the first diaphragm assembly 31, the second diaphragm assembly 32, the outer shell 1, and the magnetic circuit system 2; the first vibrating plate 312 is provided with a protrusion 3122 that approaches the diaphragm 34, and the inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32 are both connected to the protrusion 3122; wherein, the protrusion 3122 is provided with an airflow channel 3123 that connects the first rear cavity 42 and the second rear cavity 43.

[0127] In this embodiment, as shown in Figures 3 and 4, the outer side of the outer folding ring 313 of the first diaphragm assembly 31 is connected to the outer shell 1, the inner side of the inner folding ring 311 of the first diaphragm assembly 31 is connected to the central magnetic part 22 of the magnetic circuit system 2, the outer side of the diaphragm 34 is connected to the outer shell 1, and the inner edge of the diaphragm 34 is connected to the first vibrating plate 312. Thus, the outer folding ring 313, the first vibrating plate 312, the diaphragm 34 and the outer shell 1 enclose a first rear cavity 42. The outer side of the second diaphragm assembly 32 is connected to the outer shell 1, and the inner edge of the second diaphragm assembly 32 is connected to the first vibrating plate 312. Thus, the diaphragm 34, the first vibrating plate 312, the second diaphragm assembly 32 and the outer shell 1 enclose a sound-generating cavity 41, and the second diaphragm assembly 32, the first vibrating plate 312 of the first diaphragm assembly 31, the inner folding ring 311, the outer shell 1 and the magnetic yoke 21 of the magnetic circuit system 2 enclose a second rear cavity 43.

[0128] Understandably, when the voice coil 33 drives the first diaphragm assembly 31, the diaphragm 34 and the second diaphragm assembly 32 to vibrate, in order to avoid the air pressure imbalance in the sound-generating cavity 41, the first rear cavity 42 and the second rear cavity 43, the sound-generating cavity 41 is connected to the outside through the sound outlet 111, the first rear cavity 42 is connected to the second rear cavity 43, and the second rear cavity 43 is connected to the outside through the vent hole on the outer shell 1 and / or the magnetic yoke 21 of the sound-generating device 100.

[0129] In this embodiment, as shown in Figures 2 to 4, 8 and 9, a protrusion 3122 is provided on the first vibrating plate 312, which is close to the diaphragm 34. This allows the inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32 to be connected to the protrusion 3122. An airflow channel 3123 is provided on the protrusion 3122 to connect the first rear cavity 42 and the second rear cavity 43. In this way, the protrusion 3122 can be used to connect and fix the diaphragm 34 and the second diaphragm assembly 32, and the airflow channel 3123 of the protrusion 3122 can be used to connect the first rear cavity 42 and the second rear cavity 43, thereby ensuring air pressure balance and ensuring sound production effect.

[0130] Optionally, the airflow channels 3123 include multiple channels, which are spaced apart along the protrusion 3122. This arrangement ensures that the first rear cavity 42 is connected to the second rear cavity 43, avoiding pressure imbalance in the first rear cavity 42, which could affect the vibration effect of the diaphragm 34 and the first diaphragm assembly 31.

[0131] Of course, in other embodiments, the first diaphragm assembly 31 also includes a second support, one end of which is connected to the first vibrating plate 312, and the other end of which is connected to the inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32. In this case, the second support is provided with an airflow channel 3123 that connects the first rear cavity 42 and the second rear cavity 43, which is not limited here.

[0132] Understandably, the airflow channel 3123 can be a through hole, notch, or other structure provided on the protrusion 3122 or the second support. Alternatively, it can be a bulge formed by the first vibrating plate 312, the protrusion 3122, or the second support protruding toward the side away from the diaphragm 34, so that the inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32 cooperate with the bulge to form a through hole or channel structure. No limitation is made here.

[0133] To further improve the air pressure flow within the first rear cavity 42 and the second rear cavity 43, in one embodiment, the first vibrating plate 312 bends and extends towards the voice coil 33 to form a second bend 3121. The second bend 3121 is connected to the voice coil 33, and the second bend 3121 is provided with a notch 3124. In this embodiment, as shown in Figures 2, 8, and 9, by providing a notch 3124 in the second bend 3121, airflow on both sides of the second bend 3121 can flow through the notch 3124, thereby increasing the airflow velocity.

[0134] Of course, in other embodiments, the first diaphragm assembly 31 also includes a first bracket, with its two ends connected to the first vibrating plate 312 and the voice coil 33 respectively. In this case, the first bracket is provided with a notch 3124, so that the air pressure on both sides of the first bracket can flow through the notch 3124, thereby increasing the airflow speed.

[0135] Optionally, the notch 3124 can be a through hole, notch, or other structure provided on the second bend 3121 or the first bracket, or it can be a convex hull formed by the second bend 3121 or the first bracket protruding towards the side away from the voice coil 33, so that the voice coil 33 and the convex hull cooperate to form a through hole or channel structure, which is not limited here.

[0136] In one embodiment, the second diaphragm assembly 32 includes a folded ring portion 321 and a second vibrating plate 322. The outer periphery of the folded ring portion 321 is connected to the outer shell 1. The second vibrating plate 322 includes a main body portion 3221 connected to the inner edge of the folded ring portion 321 and a first bent portion 3222 formed by bending the main body portion 3221 toward the first diaphragm assembly 31. The first bent portion 3222 is connected to the inner edge of the first diaphragm assembly 31 and / or the diaphragm 34. Optionally, the first bent portion 3222 is connected to the first vibrating plate 312 of the first diaphragm assembly 31.

[0137] In this embodiment, the folded ring portion 321 of the second diaphragm assembly 32 can be an upwardly convex bulge structure or a downwardly concave concave structure, that is, the folded ring portion 321 has an upwardly convex or downwardly concave deformation section, which is not limited here. In order to facilitate the connection between the folded ring portion 321 and the outer shell 1, the outer periphery of the folded ring portion 321 is bent to form a first flange, and the first flange is connected to the outer wall of the outer shell 1.

[0138] Understandably, the first flange is formed by extending the outer periphery of the deformable section of the folded ring portion 321 along the vibration direction of the vibration system. The first flange can be connected to the outer wall of the outer shell 1, thereby increasing the connection area between the folded ring portion 321 and the outer shell 1, and improving the connection stability and waterproof sealing. Of course, the outer side of the deformable section of the folded ring portion 321 has a horizontal portion extending along the vibration direction perpendicular to the vibration system. The horizontal portion is connected to the end face of the outer shell 1, and the outer side of the horizontal portion extends along the vibration direction of the vibration system to form the first flange. This is not limited here.

[0139] In this embodiment, by configuring the second diaphragm plate 322 as the main body 3221 and the first bent portion 3222, the end of the main body 3221 away from the first bent portion 3222 is connected to the inner edge of the loop portion 321, that is, the inner edge of the deformed section of the loop portion 321 is connected to the main body 3221, and the first bent portion 3222 is connected to the inner edge of the first diaphragm plate 312 and / or the diaphragm 34, so that the diaphragm 34, the second diaphragm plate 322 of the second diaphragm assembly 32, the loop portion 321, and the outer shell 1 form a sound cavity 41. It can be understood that the second diaphragm plate 322 of the second diaphragm assembly 32 is connected to the voice coil 33 through the first diaphragm plate 312. Thus, when the voice coil 33 drives the diaphragm 34 and the second diaphragm assembly 32 to vibrate through the first diaphragm plate 312, the second diaphragm plate 322 of the second diaphragm assembly 32 drives the loop portion 321 to vibrate and deform.

[0140] Optionally, the folded ring portion 321 of the second diaphragm assembly 32 and the second vibrating plate 322 are bonded together or integrally injection molded, which is not limited here. In this embodiment, the main body portion 3221 of the second vibrating plate 322 and the first bending portion 3222 are integrally molded structures. The first bending portion 3222 is formed by bending and extending the main body portion 3221 toward the first vibrating plate 312, for example by injection molding or stamping, which is not limited here.

[0141] In one embodiment, an inclined portion 3223 is formed at the connection between the main body portion 3221 and the first bending portion 3222, and the inclined portion 3223 is set at an angle to the vibration direction of the vibration system 3.

[0142] As can be understood, as shown in Figures 2 to 4 and Figure 10, the plane containing the inclined portion 3223 is set at an angle to the vibration direction of the vibration system 3. This angle can optionally be greater than 0° and less than 90°. The inclined portion 3223 can improve the rigidity of the second vibrating plate 322 in the horizontal direction (i.e., perpendicular to the vibration direction of the vibration system 3), thereby improving the vibration performance of the second diaphragm assembly 32 and increasing the feasibility of molding. At the same time, the inclined portion 3223 is further away from the inner edge of the second vibrating plate 322 from the magnetic circuit system 2, which allows the outer edge of the magnetic circuit system 2 to tilt and expand outward, thereby increasing the size of the magnetic circuit system 2 and further improving the BL of the sound generating device 100; and the inclined portion 3223 makes it easier to position and connect the second vibrating plate 322 and the folded ring portion 321, improving the connection accuracy. Optionally, the second vibrating plate 322 can be magnesium-aluminum alloy, magnesium-lithium alloy, etc., which is not limited here.

[0143] In one embodiment, the diaphragm 34 is a flexible component, comprising an outer connecting portion 341, a deformable portion 342, and an inner connecting portion 343 connected in sequence. The outer periphery of the outer connecting portion 341 is connected to the outer shell 1, and the inner edge of the inner connecting portion 343 is connected to the first diaphragm assembly 31 and / or the first bending portion 3222. The deformable portion 342 is bent. Optionally, the inner edge of the diaphragm 34 and the inner edge of the second diaphragm assembly 32 are both connected to the first vibrating plate 312.

[0144] In this embodiment, as shown in Figures 2 to 5, 11 and 12, by setting the diaphragm 34 as a flexible component, when the voice coil 33 drives the diaphragm 34 and the second diaphragm assembly 32 to vibrate through the first diaphragm assembly 31, the diaphragm 34 vibrates and deforms, causing a relative change in volume between the diaphragm 34 and the second diaphragm assembly 32, thereby promoting the smooth flow of air in the sound cavity 41 through the sound outlet 111, increasing the effective vibration area of ​​the sound generating device 100 when it vibrates, and thus improving the performance of the sound generating device 100.

[0145] Understandably, by configuring the diaphragm 34 as an outer connecting part 341, a deformable part 342, and an inner connecting part 343, the outer periphery of the outer connecting part 341 is connected to the outer shell 1, and the inner edge of the inner connecting part 343 is connected to the first diaphragm assembly 31 and / or the first bending part 3222. In this way, the diaphragm 34 can be fixedly connected to the outer shell 1 through the outer connecting part 341, and can also be connected to the first diaphragm assembly 31 through the inner connecting part 343, so that a sealed sound cavity 41 is formed between the diaphragm 34 and the second diaphragm assembly 32. At the same time, the deformable part 342 is set to be bent, thus improving the deformation capability of the diaphragm 34. So when the voice coil 33 drives the diaphragm 34 and the second diaphragm assembly 32 to vibrate through the first diaphragm assembly 31, the diaphragm 34 vibrates and deforms. At the same time, the second vibrating plate 322 of the second diaphragm assembly 32 drives the folded ring part 321 to vibrate and deform.

[0146] In one embodiment, the inner edge of the inner connecting portion 343 extends along the inner surface of the first diaphragm assembly 31 to form a second flange 3431, and the first bending portion 3222 forms a straight section 3225 extending along the inner surface of the first diaphragm assembly 31 at one end adjacent to it; wherein, the second flange 3431 is sandwiched between the first diaphragm assembly 31 and the straight section 3225; or, the straight section 3225 is sandwiched between the second flange 3431 and the first diaphragm assembly 31; or, the second flange 3431 and the straight section 3225 are respectively connected to the first diaphragm assembly 31.

[0147] Specifically, the inner edge of the inner connecting portion 343 extends along the inner surface of the first vibrating plate 312 to form a second flange 3431, and the end of the first bending portion 3222 adjacent to the first vibrating plate 312 forms a straight section 3225 extending along the inner surface of the first vibrating plate 312; wherein, the second flange 3431 is sandwiched between the first vibrating plate 312 and the straight section 3225; or, the straight section 3225 is sandwiched between the second flange 3431 and the first vibrating plate 312; or, the second flange 3431 and the straight section 3225 are respectively connected to the first vibrating plate 312.

[0148] In this embodiment, as shown in Figures 2 to 4 and Figure 12, a second flange 3431 is provided at the inner edge of the inner connecting portion 343, extending along the inner surface of the first vibrating plate 312. This connection between the second flange 3431 and the first vibrating plate 312 increases the contact area, improving connection stability and further enhancing waterproof sealing performance. Similarly, by bending one end of the first bending portion 3222 near the first vibrating plate 312 to form a straight section 3225, which extends along the inner surface of the first vibrating plate 312, the connection between the straight section 3225 and the first vibrating plate 312 increases the contact area, improving connection stability and further enhancing waterproof sealing performance.

[0149] Optionally, the second flange 3431 of the diaphragm 34 and the straight section 3225 of the second vibrating plate 322 are respectively connected to the first vibrating plate 312. It is understood that both the second flange 3431 and the straight section 3225 are connected to the first vibrating plate 312. In this case, the second flange 3431 and the straight section 3225 may be arranged at intervals on the inner surface of the first vibrating plate 312 or adjacent to each other on the inner surface of the first vibrating plate 312, which is not limited here.

[0150] To reduce the area occupied by the diaphragm 34 and the second vibrating plate 322 when connected to the first vibrating plate 312, while ensuring connection stability, the second flange 3431 of the diaphragm 34 is sandwiched between the first vibrating plate 312 and the straight section 3225 of the second vibrating plate 322. That is, the first vibrating plate 312, the second flange 3431, and the straight section 3225 are stacked sequentially along the vibration direction of the vibration system; or, the straight section 3225 of the second vibrating plate 322 is sandwiched between the second flange 3431 of the diaphragm 34 and the first vibrating plate 312. That is, the first vibrating plate 312, the straight section 3225, and the second flange 3431 are stacked sequentially along the vibration direction of the vibration system. This is not limited here.

[0151] Optionally, the outer connecting part 341, the deformable part 342, the inner connecting part 343 and the second flange 3431 of the diaphragm 34 are integrally formed structures, such as integral injection molding or integral stamping, etc., which are not limited here.

[0152] In this embodiment, the compliance of the diaphragm 34 may optionally be greater than or equal to the compliance of the surround portion 321. Understandably, this allows the diaphragm 34 to function only as an isolation and seal when the voice coil 33 drives the diaphragm 34 and the second diaphragm assembly 32 to vibrate via the first diaphragm plate 312, without generating a reverse force on the vibration of the second diaphragm assembly 32, thus improving the low-frequency sensitivity of the loudspeaker.

[0153] Understandably, the compliance of the diaphragm 34 may optionally be greater than or equal to the compliance of the inner fold 311 of the first diaphragm assembly 31, and the compliance of the diaphragm 34 may optionally be greater than or equal to the compliance of the outer fold 313 of the first diaphragm assembly 31. In this way, the diaphragm 34 only serves a sealing function and will not produce a reverse effect on the vibration of the first diaphragm assembly 31 and the second diaphragm assembly 32, thereby improving low-frequency sensitivity.

[0154] Optionally, the deformable portion 342 protrudes in a direction away from the first diaphragm assembly 31, and the deformable segment of the folded ring portion 321 protrudes in a direction close to the first diaphragm assembly 31. The deformable portion 342 and the deformable segment of the folded ring portion 321 are offset in a direction perpendicular to the vibration system 3. It is understood that this arrangement prevents interference between the deformable segment of the folded ring portion 321 of the second diaphragm assembly 32 and the deformable portion 342 of the diaphragm 34 during vibration. Of course, in other embodiments, the deformable segment of the folded ring portion 321 may also protrude in a direction away from the first diaphragm assembly 31; this is not limited here.

[0155] In one embodiment, along the vibration direction of the vibration system 3, the projected width L1 of the deformed portion 342 is greater than or equal to the projected width L2 of the deformed segment of the folded ring portion 321, and the ratio of L1 to L2 is 1:1 to 3:1.

[0156] In this embodiment, as shown in FIG3, along the vibration direction of the vibration system 3, by setting the projected width L1 of the deformable portion 342 of the diaphragm 34 to be greater than or equal to the projected width L2 of the deformable segment of the folded ring portion 321 of the second diaphragm assembly 32, it can be effectively ensured that the effective vibration area Sd2 of the second diaphragm assembly 32 is greater than the effective vibration area Sd1 of the diaphragm 34. Thus, when the voice coil 33 drives the second diaphragm assembly 32 and the diaphragm 34 to vibrate, the diaphragm 34 has a counteracting effect on pushing the air volume, while the second diaphragm assembly 32 has a positive effect on pushing the air volume. By utilizing the volume change of the sound cavity 41 to increase the volume of air pushed during operation, the effective vibration area of ​​the product is increased.

[0157] Optionally, the ratio of L1 to L2 can be 1:1, 1.5:1, 2:1, 2.5:1, 3:1, etc., and is not limited here.

[0158] In one embodiment, the magnetic circuit system 2 includes a magnetic yoke 21 and a central magnetic part 22 and a side magnetic part 23 disposed on the magnetic yoke 21. The side magnetic part 23 is located outside the central magnetic part 22 and forms a magnetic gap 24 with the central magnetic part 22. The inner side of the inner fold ring 311 is connected to the central magnetic part 22. The side magnetic part 23 includes a plurality of side magnetic parts, and a clearance space 233 is formed between two adjacent side magnetic parts 23.

[0159] In this embodiment, as shown in Figures 2, 5, and 6, the side magnetic portion 23 of the magnetic circuit system 2 is disposed around the outside of the central magnetic portion 22, and the side magnetic portion 23 and the central magnetic portion 22 are spaced apart to form a magnetic gap 24. Optionally, there are multiple side magnetic portions 23, which are spaced apart and disposed around the outside of the central magnetic portion 22, such that adjacent side magnetic portions 23 are spaced apart to form a clearance space 233. Of course, in other embodiments, the side magnetic portion 23 may also be configured as an integral ring structure, which is not limited here.

[0160] In one embodiment, the second vibrating plate 322 has a first extension 3224 extending into the clearance space 233, and the diaphragm 34 has a second extension 344 extending into the clearance space 233, with the second extension 344 correspondingly connected to the first extension 3224.

[0161] In this embodiment, as shown in Figures 2, 5, 11, and 13, by providing multiple side magnets 23, which surround and are spaced apart on the outside of the central magnet 22, a clearance space 233 is formed between adjacent side magnets 23. A first extension 3224 is provided on the second diaphragm assembly 32, extending towards the clearance space 233 and connecting to the first diaphragm assembly 31 / first diaphragm plate 312. This increases the connection stability between the second diaphragm assembly 32 and the first diaphragm assembly 31 / first diaphragm plate 312, ensuring that the voice coil 33 drives the second diaphragm assembly 32 to vibrate via the first diaphragm assembly 31 / first diaphragm plate 312. Optionally, the first extension 3224 is formed by the second diaphragm plate 322 extending towards the clearance space 233.

[0162] In this embodiment, as shown in Figures 5 and 13, the diaphragm 34 has a second extension 344 extending into the clearance space 233. The second extension 344 corresponds to the first extension 3224, thereby further increasing the volume of the sound-generating cavity 41 formed between the diaphragm 34 and the second vibrating plate 322, thereby improving the vibration effect. At the same time, it increases the connection stability and sealing of the diaphragm 34, the second vibrating plate 322, and the first diaphragm assembly 31 / first vibrating plate 312.

[0163] Understandably, the inner connecting portion 343 and the second flange 3431 of the diaphragm 34 both extend toward the clearance space 233 and form the second extension portion 344, which is not limited here. The main body portion 3221, the first bending portion 3222 and the straight section 3225 of the second vibrating plate 322 all extend toward the clearance space 233 and form the first extension portion 3224, which is not limited here.

[0164] In this embodiment, the central magnetic part 22 can be a rectangular structure, the clearance space 233 of the side magnetic part 23 is set at the corner position of the central magnetic part 22, the second vibration plate 322 is provided with a first extension 3224 for each clearance space 233, and the diaphragm 34 is provided with a second extension 344 for each clearance space 233, which is not limited here.

[0165] In another embodiment, the voice coil 33 has a first protrusion 331 extending into the clearance space 233, and the central magnet 22 has a second protrusion 224 extending into the clearance space 233, with the first protrusion 331 and the second protrusion 224 disposed opposite to each other.

[0166] In this embodiment, as shown in FIG6, a plurality of side magnetic parts 23 are arranged around and spaced apart on the outside of the central magnetic part 22, so that a clearance space 233 is formed between two adjacent side magnetic parts 23. By providing a first protrusion 331 on the voice coil 33, the first protrusion 331 extends to the clearance space 233, and a second protrusion 224 is provided on the central magnetic part 22, the second protrusion 224 extends to the clearance space 233, and is spaced apart from and corresponds to the first protrusion 331. This arrangement increases the length of the wire of the voice coil 33, thereby facilitating the connection between the centering support 35 and the voice coil 33. On the other hand, it increases the magnet volume of the central magnetic part 22, thereby effectively improving the magnetic field strength and further improving the BL value of the sound generating device 100.

[0167] Understandably, the central magnet 22 can be a rectangular structure, the voice coil 33 can be a rectangular voice coil, the clearance space 233 of the side magnet 23 is set at the corner position of the central magnet 22, the four corner positions of the voice coil 33 are respectively provided with a first protrusion 331, and the four corner positions of the central magnet 22 are respectively provided with a second protrusion 224, which is not limited here.

[0168] In this embodiment, the clearance space 233 of the side magnet 23 has two opposing first sides, the first protrusion 331 of the voice coil 33 has two second sides that are respectively opposite to the two first sides, and the two second sides are opposite to the two first sides and spaced apart. The second protrusion 224 of the center magnet 22 has two third sides that are respectively opposite to the two second sides, and the two third sides are opposite to the two second sides and spaced apart. That is, each second side is located between a first side and a third side.

[0169] In one embodiment, the vibration system 3 further includes a centering support 35, which includes an outer fixing part 351, an inner fixing part 352, and a vibrating arm 353 connecting the outer fixing part 351 and the inner fixing part 352. The outer fixing part 351 is connected to the outer shell 1. The second diaphragm assembly 32 includes a folded ring part 321 and a second vibrating plate 322 connected to each other. The outer periphery of the folded ring part 321 is connected to the outer shell 1, and the inner edge of the second vibrating plate 322 is connected to the inner edge of the first diaphragm assembly 31 and / or the diaphragm 34. The inner fixing part 352 is connected to the second vibrating plate 322 and the voice coil 33, and is electrically connected to the lead wire of the voice coil 33.

[0170] In this embodiment, as shown in Figures 2, 6, and 14, by connecting the outer fixing part 351 of the centering support 35 to the outer shell 1, and the inner fixing part 352 to the voice coil 33 and electrically connecting it to the lead wire of the voice coil 33, the voice coil 33 is connected to the external circuit through the centering support 35 and conducts through it. On the other hand, the centering support 35 plays a centering role in the vibration of the voice coil 33, preventing the voice coil 33 from swinging or polarizing during vibration.

[0171] To avoid interference or influence on the second diaphragm assembly 32 caused by the centering support 35, the folded ring portion 321 of the second diaphragm assembly 32 protrudes towards the direction close to the first diaphragm assembly 31. It is understood that there can be one or more centering supports 35. When there are multiple centering supports 35, they are distributed along the major axis and / or minor axis and / or the four corner positions of the magnetic circuit system 2.

[0172] It is understood that the multiple centering supports 35 can be symmetrically distributed along the long axis of the magnetic circuit system 2; the multiple centering supports 35 can also be symmetrically distributed along the short axis of the magnetic circuit system 2; the multiple centering supports 35 can also be correspondingly arranged at the four corners of the magnetic circuit system 2. Of course, in other embodiments, the multiple centering supports 35 can be correspondingly distributed along the long axis of the magnetic circuit system 2, the short axis of the magnetic circuit system 2, and at the diagonal or four corners of the magnetic circuit system 2, which is not limited here.

[0173] Optionally, the centering support 35 may include two or four. This arrangement can both connect the voice coil 33 to the external circuit using the centering support 35 and ensure the vibration balance of the sound-generating device 100.

[0174] In one embodiment, the centering support 35 includes an outer fixing part 351, an inner fixing part 352, and a vibrating arm 353 connecting the outer fixing part 351 and the inner fixing part 352. The outer fixing part 351 is connected to the outer shell 1, and the inner fixing part 352 is connected to the second vibrating plate 322 and the voice coil 33.

[0175] In this embodiment, as shown in Figures 2 to 4 and Figure 14, the inner fixing part 352 is connected to the second diaphragm assembly 32 and the second diaphragm plate 322 and the voice coil 33, and is electrically connected to the lead wire of the voice coil 33. Optionally, the inner fixing part 352 is provided with an inner solder pad 3523, and the lead wire of the voice coil 33 is connected and conductive to the inner solder pad 3523. This facilitates the wiring connection of the lead wire of the voice coil 33 and enables smooth connection and conduction with the external circuit. It is understood that the main body 3221 of the second diaphragm plate 322 is connected to the inner fixing part 352 of the centering support plate 35. Optionally, the inner fixing part 352 is connected to the side of the main body 3221 facing away from the folded ring part 321.

[0176] Optionally, as shown in Figures 2 and 14, the outer fixing part 351, the vibrating arm 353, and the inner fixing part 352 of the centering support 35 can be integrally formed. This can effectively ensure the structural strength of the centering support 35 and simplify the processing steps of the centering support 35. To ensure the deformation capability of the centering support 35, the vibrating arm 353 can optionally have at least one bend.

[0177] In one embodiment, as shown in Figures 2 and 14, the outer fixing part 351 is arranged in a ring shape and has alternating short axis sides and long axis sides. The vibration arm 353 is led out from the side of the inner fixing part 352 corresponding to the short axis side and extends along the long axis side after being bent. The vibration arm 353 is connected to the central area of ​​the long axis side.

[0178] In this embodiment, as shown in Figures 2 and 14, there is one centering support plate 35. The outer fixing part 351 of the centering support plate 35 can be a rectangular ring structure. The vibration arm 353 includes at least two parts, and the inner fixing part 352 can be four parts. It is understandable that this arrangement increases the length of the vibration arm 353, improves the stress on the vibration arm 353, and thus enhances reliability.

[0179] Optionally, the vibrating arms 353 include four, and the inner fixing parts 352 include four. Each inner fixing part 352 is connected to the outer fixing part 351 via a vibrating arm 353. Optionally, the four vibrating arms 353 and the four inner fixing parts 352 are respectively arranged at the four corner positions of the rectangular ring outer fixing part 351. In this embodiment, the four inner fixing parts 352 are respectively arranged corresponding to the clearance space 233 of the side magnetic part 23, and at least a portion of the inner fixing parts 352 extends through the clearance space 233 into the magnetic gap 24 and connects to the voice coil 33, which is not limited here.

[0180] As can be understood, as shown in Figures 2 and 14, the outer fixing part 351, the vibrating arm 353, and the inner fixing part 352 of the centering support 35 can be located in the same plane. Of course, in other embodiments, the outer fixing part 351 and the inner fixing part 352 of the centering support 35 can also be located in different planes, which is not limited here.

[0181] In this embodiment, as shown in Figures 2 to 4 and Figure 14, the voice coil 33 may optionally be rectangular, and the four inner fixing parts 352 of the centering support 35 are respectively arranged at the four corner positions of the voice coil 33, which is not limited here. It can be understood that the outer fixing part 351 of the centering support 35 is bonded to the outer shell 1, and the inner fixing part 352 can be bonded or welded to the second diaphragm 322 and the voice coil 33, which is not limited here. In this way, the length of the diaphragm arm 353 of the centering support 35 can be increased by utilizing the overall length of the product, resulting in better reliability when operating at large amplitude; at the same time, the centering support 35 provides constraint on the vibration system 3, which can better suppress the poor performance caused by product polarization under large amplitude.

[0182] To facilitate better connection with external circuits, in one embodiment, as shown in Figures 1, 2, 4, 6, and 14, the centering support 35 further includes a conductive portion 354. One end of the conductive portion 354 is connected to the external fixing portion 351, and the other end of the conductive portion 354 extends away from the housing 1 and is provided with an external solder pad. This configuration allows the external solder pad to be guided to the outside of the housing 1 via the conductive portion 354, thereby facilitating the connection and conduction between the external circuit and the centering support 35, ensuring current flows through the voice coil 33.

[0183] In one embodiment, the magnetic yoke 21 is provided with a clearance structure 211 corresponding to the inner fixing part 352. As can be understood, as shown in Figures 2 and 7, by providing the clearance structure 211 on the magnetic yoke 21, the clearance structure 211 can be used to provide clearance for the centering support 35 during vibration with the second diaphragm assembly 32, ensuring that the inner fixing part 352 of the centering support 35 will not touch the magnetic yoke 21.

[0184] Optionally, the clearance structure 211 can be a recessed groove or a through hole. It is understood that if the clearance structure 211 is a recessed groove, that is, a groove structure formed by the side of the magnetic yoke 21 facing the centering support 35 and recessed away from the centering support 35. If the clearance structure 211 is a through hole, that is, a through hole that passes through the magnetic yoke 21; simultaneously, the clearance structure 211 can also be used as a vent hole for the sound-generating device 100 to ensure that the airflow in the vibration cavity of the sound-generating device 100 is connected to the external airflow during the vibration of the first diaphragm assembly 31, thereby ensuring internal and external air pressure balance.

[0185] In one embodiment, the inner fixing part 352 includes a body part 3521 and a third extension part 3522 extending from the body part 3521 toward the voice coil 33. The body part 3521 is connected to the second diaphragm 322, and the third extension part 3522 is connected to the voice coil 33. The third extension part 3522 or the body part 3521 is provided with an inner solder pad 3523 that is electrically connected to the lead wire of the voice coil 33.

[0186] In this embodiment, as shown in Figures 2 and 14, by setting the inner fixing part 352 of the centering support 35 as a body part 3521 and a third extension part 3522, the third extension part 3522 extends toward the voice coil 33. In this way, while the body part 3521 of the inner fixing part 352 is connected to the second diaphragm assembly 322, the inner fixing part 352 of the centering support 35 is connected to the voice coil 33 through the third extension part 3522, thereby further ensuring that the voice coil 33 drives the second diaphragm assembly 32 to vibrate during the vibration process.

[0187] Understandably, by providing an inner pad 3523 in the third extension 3522 or the main body 3521, it is possible to conveniently connect the inner pad 3523 to the lead wire of the voice coil 33, thus ensuring that the voice coil 33 is connected to the external circuit through the centering support 35.

[0188] In one embodiment, the side magnet portion 23 includes a plurality of side magnet portions 23, and a clearance space 233 is formed between two adjacent side magnet portions 23. The voice coil 33 has a first protrusion 331 extending to the clearance space 233, and the first protrusion 331 is connected to the inner fixing portion 352.

[0189] In this embodiment, as shown in FIG6, by providing a first protrusion 331 in the voice coil 33, extending the first protrusion 331 to the clearance space 233, the length of the conductor of the voice coil 33 is increased, thereby helping to improve the BL value, and it also facilitates the connection between the centering support 35 and the voice coil 33. It is understood that the central magnet 22 has a second protrusion 224 extending to the clearance space 233, with the first protrusion 331 and the second protrusion 224 arranged opposite to each other. This increases the magnet volume of the central magnet 22, thereby effectively improving the magnetic field strength and further enhancing the BL value of the sound-generating device 100.

[0190] Understandably, by connecting the inner fixed part 352 of the centering support 35 to the first protrusion 331 of the voice coil 33, the voice coil 33 is connected to the external circuit through the centering support 35, and the centering support 35 plays a centering role in the vibration of the voice coil 33, preventing the voice coil 33 from swinging or polarizing during vibration.

[0191] In one embodiment, the outer shell 1 includes a first shell 11 and a second shell 12. The first shell 11 is provided with a sound outlet 111. The outer periphery of the outer folding ring 313 and the outer periphery of the diaphragm 34 are both connected to the first shell 11. The magnetic circuit system 2 is connected to the second shell 12. The outer periphery of the second diaphragm assembly 32 is sandwiched between the first shell 11 and the second shell 12.

[0192] In this embodiment, as shown in Figures 1 to 4, by setting the outer shell 1 as a first shell 11 and a second shell 12, it is convenient to use the first shell 11 to fix the outer periphery of the first diaphragm assembly 31 and the diaphragm 34, and to use the second shell 12 to fix the magnetic circuit system 2. At the same time, the first shell 11 and the second shell 12 are used to fix the outer periphery of the second diaphragm assembly 32.

[0193] Understandably, the outer periphery of the outer folding ring 313 of the first diaphragm assembly 31 and the outer periphery of the diaphragm 34 are both connected to the first housing 11, the magnetic yoke 21 of the magnetic circuit system 2 is connected to the second housing 12, and the outer periphery of the second diaphragm assembly 32 is sandwiched between the first housing 11 and the second housing 12.

[0194] In one embodiment, as shown in Figures 2 to 4, 6 and 14, the vibration system 3 further includes a centering support 35. The centering support 35 includes an outer fixing part 351, an inner fixing part 352 and a vibration arm 353 connecting the outer fixing part 351 and the inner fixing part 352. The outer fixing part 351 is sandwiched between the outer periphery of the second housing 12 and the second diaphragm assembly 32. The inner fixing part 352 is connected to the voice coil 33 and electrically connected to the lead wire of the voice coil 33.

[0195] In this embodiment, the outer shell 1 can be a plastic shell or a metal shell, that is, both the first shell 11 and the second shell 12 can be plastic shells or metal shells. Of course, in other embodiments, one of the first shell 11 and the second shell 12 of the outer shell 1 may be a plastic shell and the other may be a metal shell, etc., which is not limited here.

[0196] Optionally, the second housing 12 of the outer shell 1 and the magnetic yoke 21 of the magnetic circuit system 2 are integrally molded. It is understood that when the second housing 12 is a plastic housing, the second housing 12 and the magnetic yoke 21 are integrally injection molded. Alternatively, when the second housing 12 is a metal housing, the second housing 12 and the magnetic yoke 21 are integrally molded; this is not limited here.

[0197] In one embodiment, the first housing 11 may be a metal housing, and the second housing 12 may be a metal housing.

[0198] To further improve the connection stability between the first housing 11 and the second housing 12 or the magnetic circuit system 2, in one embodiment, as shown in Figures 1 and 2, the first housing 11 is provided with a welding portion 121 extending toward the magnetic circuit system 2. The welding portion 121 is welded to the magnetic circuit system 2 or the second housing 12. That is, the first housing 11 is provided with a welding portion 121 extending toward the magnetic guide yoke 21, and the welding portion 121 is welded to the magnetic guide yoke 21 or the second housing 12. In another embodiment, as shown in Figures 1 and 2, the magnetic circuit system 2 or the second housing 12 is provided with a welding portion 121 extending toward the first housing 11. The welding portion 121 is welded to the outer wall of the first housing 11. That is, the magnetic guide yoke 21 or the second housing 12 is provided with a welding portion 121 extending toward the first housing 11, and the welding portion 121 is welded to the outer wall of the first housing 11.

[0199] Of course, in another embodiment, the sound-generating device 100 also includes a metal welding piece. One end of the metal welding piece is welded to the magnetic circuit system 2 or the second housing 12, and the other end of the metal welding piece is welded to the outer wall of the first housing 11. That is, one end of the metal welding piece is welded to the magnetic yoke 21 or the second housing 12, and the other end of the metal welding piece is welded to the outer wall of the first housing 11. It can be understood that the connection stability between the first housing 11 and the second housing 12 or the magnetic yoke 21 can be further improved by the metal welding piece.

[0200] In one embodiment, the first housing 11 has a sidewall 112 and an inner bend 113 formed by bending and extending the sidewall 112 away from the second housing 12 toward the inward side. The outer periphery of the outer fold ring 313 and the diaphragm 34 are both connected to the inner bend 113. The outer periphery of the second diaphragm assembly 32 is sandwiched between the end of the sidewall 112 away from the inner bend 113 and the second housing 12. The sound outlet 111 is provided on the sidewall 112 or the inner bend 113.

[0201] In this embodiment, as shown in Figures 2 to 4, by setting the first housing 11 as a side wall 112 and an inner bend 113 arranged at an angle, the inner bend 113 of the first housing 11 is used to install and fix the first diaphragm assembly 31 and the diaphragm 34. At the same time, the side wall 112 of the first housing 11 cooperates with the second housing 12 to clamp and fix the outer periphery of the second diaphragm assembly 32 and the centering support plate 35. That is, the outer periphery of the folded ring portion 321 of the second diaphragm assembly 32 and the outer fixing portion 351 of the centering support plate 35 are sandwiched between the end of the side wall 112 away from the inner bend 113 and the second housing 12.

[0202] Understandably, the outer fixing portion 351 of the centering support 35 is located between the outer periphery of the folded ring portion 321 of the second diaphragm assembly 32 and the second housing 12, and the other end of the second housing 12 is connected to the magnetic yoke 21. In this embodiment, the inner bending portion 113 of the first housing 11 is formed by bending and extending the side wall 112 away from the second housing 12 inward, that is, the inner bending portion 113 and the side wall 112 of the first housing 11 are integrally formed, which can ensure the structural strength of the first housing 11, and is not limited here.

[0203] In order to further increase the contact area between the first diaphragm assembly 31 and the first housing 11, and improve the connection stability and waterproof sealing, the outer periphery of the outer folding ring 313 of the first diaphragm assembly 31 is bent and extended to form a third flange 3131, and the third flange 3131 is connected to the outer wall surface of the side wall 112 of the first housing 11.

[0204] In this embodiment, the outer folded ring 313 of the first diaphragm assembly 31 is fixed to the inner bend 113 of the first housing 11, so that the first diaphragm assembly 31 is bonded and fixed to the maximum outer shape of the housing 1. This allows the effective vibration area of ​​the product to be increased by utilizing the product's external dimensions. At the same time, the magnetic yoke 21 of the magnetic circuit system 2 is fixed to the second housing 12, and the outer periphery of the second diaphragm assembly 32 is sandwiched between the first housing 11 and the second housing 12. The height of the housing 1 can be adjusted to increase or decrease according to the product's amplitude requirements, so that the sound-generating cavity 41 between the diaphragm 34 and the second diaphragm assembly 32 can be adapted to the needs of different products.

[0205] Optionally, the sound outlet 111 may be located on the side wall 112 or the inner bend 113, which is not limited here.

[0206] In one embodiment, as shown in Figures 3 and 4, the inner bend 113 includes an upper surface, a lower surface and an inner surface. The upper surface and the lower surface are arranged opposite to each other, and the inner surface connects the upper surface and the lower surface and is located at the end of the inner bend 113 away from the sidewall 112.

[0207] In this embodiment, as shown in Figures 3 and 4, the outer periphery of the outer folded ring 313 is connected to the upper surface, and the outer periphery of the diaphragm 34 is connected to the lower surface. This arrangement not only fixes the first diaphragm assembly 31 and the diaphragm 34, but also ensures the distance between the first diaphragm assembly 31 and the diaphragm 34, thereby avoiding interference and other problems during vibration.

[0208] Of course, in other embodiments, the outer periphery of the outer folding ring 313 of the first diaphragm assembly 31 is connected to the upper surface, and the outer periphery of the diaphragm 34 is connected to the inner surface; or, the outer periphery of the outer folding ring 313 is connected to the upper surface, and the outer periphery of the diaphragm 34 is sandwiched between the outer periphery of the outer folding ring 313 and the upper surface; or, the outer periphery of the outer folding ring 313 is connected to the inner surface, and the outer periphery of the diaphragm 34 is connected to the lower surface; or, the outer peripheries of both the outer folding ring 313 and the diaphragm 34 are connected to the inner surface, which is not limited here.

[0209] It is understood that the outer connecting portion 341 of the diaphragm 34 can be connected to the lower surface, inner surface, or upper surface of the inner bend 113, etc., and is not limited here. In this embodiment, when the outer connecting portion 341 of the diaphragm 34 and the outer periphery of the outer fold ring 313 are simultaneously connected to the upper surface of the inner bend 113, the outer connecting portion 341 of the diaphragm 34 is located between the outer periphery of the outer fold ring 313 and the upper surface of the inner bend 113, and is not limited here.

[0210] In one embodiment, the central magnetic part 22 includes a first central magnet 221, a central magnetic plate 222 and a second central magnet 223 stacked together. The first central magnet 221 is connected to the magnetic yoke 21, and the inner side of the inner folding ring 311 is connected to the second central magnet 223.

[0211] In this embodiment, as shown in Figures 2 to 4 and Figure 7, the central magnetic part 22 is configured as a magnetically opposed structure, such that the first central magnet 221, the central magnetic guide plate 222, and the second central magnet 223 are sequentially stacked on the magnetic yoke 21 in the vertical direction. It is understood that both the first central magnet 221 and the second central magnet 223 are magnetized along the vibration direction of the vibration system 3, and the magnetization direction of the first central magnet 221 is opposite to that of the second central magnet 223. Thus, utilizing the magnetic guiding effect of the central magnetic guide plate 222, the magnetic field lines of the first central magnet 221 and the second central magnet 223 are concentrated on the central magnetic guide plate 222 and transmitted to the magnetic gap 24. This causes the central magnetic part 22 to generate a magnetic field with a strong magnetic field strength that passes through the magnetic gap 24, thereby increasing the magnetic flux density of the magnetic gap 24, increasing the number of magnetic field lines passing through the voice coil 33, increasing the magnetic force on the voice coil 33, and effectively improving the BL value.

[0212] Optionally, the first central magnet 221 is an integral plate-like structure. In this embodiment, as shown in Figures 2 to 4 and Figure 7, by setting the first central magnet 221 as an integral plate-like structure, it is convenient to process the first central magnet 221, as well as to assemble and magnetize it, effectively improving production and assembly efficiency.

[0213] Of course, in other embodiments, there are multiple first central magnets 221, which are adjacent to each other and laid flat between the central magnetic guide plate 222 and the magnetic yoke 21. All the multiple first central magnets 221 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple first central magnets 221 are the same. Optionally, the magnetic poles of the multiple first central magnets 221 on the side closest to the central magnetic guide plate 222 are all the same.

[0214] Optionally, the central magnetic plate 222 of the central magnetic part 22 can be an integral square plate structure and located between the first central magnet 221 and the second central magnet 223; or, the central magnetic plate 222 includes multiple central magnetic plates 222, which are arranged adjacently and in parallel between the first central magnet 221 and the second central magnet 223, so that the multiple central magnetic plates 222 cooperate to form a square plate structure, which is not limited here.

[0215] Optionally, the second central magnet 223 is an integral plate-like structure. In this embodiment, as shown in Figures 2 to 4 and Figure 7, by setting the second central magnet 223 as an integral plate-like structure, it is convenient to process the second central magnet 223, as well as to assemble and magnetize it, effectively improving production and assembly efficiency.

[0216] Of course, in other embodiments, there are multiple second central magnets 223, which are adjacent to each other and laid flat on the side of the central magnetic plate 222 facing away from the first central magnet 221. All the multiple second central magnets 223 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple second central magnets 223 are the same. Optionally, the magnetic poles of the multiple second central magnets 223 near the central magnetic plate 222 are all the same.

[0217] In this embodiment, the inner side of the inner folded ring 311 of the first diaphragm assembly 31 is connected to the second central magnet 223. In order to avoid the second central magnet 223 interfering with the inner folded ring 311 when the inner folded ring 311 vibrates, in one embodiment, as shown in Figures 2 to 4 and Figure 7, the edge of the second central magnet 223 is provided with a clearance structure.

[0218] In this embodiment, the avoidance structure surrounds the periphery of the second central magnet 223 on the side facing away from the central magnetic guide plate 222, that is, the avoidance structure is a single, integral annular inclined surface. Of course, in other embodiments, the avoidance structure includes multiple avoidance structures, which are spaced apart and surround the periphery of the second central magnet 223 on the side facing away from the central magnetic guide plate 222. In this case, adjacent avoidance structures are not connected and have a certain distance between them. Alternatively, the avoidance structure includes multiple avoidance structures, with adjacent avoidance structures connected end-to-end to form a closed ring structure, surrounding the periphery of the second central magnet 223 on the side facing away from the central magnetic guide plate 222. In this case, adjacent avoidance structures are adjacent and form a ring structure. Optionally, the included angles formed by the multiple avoidance structures and the surface of the second central magnet 223 on the side facing away from the central magnetic guide plate 222 can be the same, different, or at least partially the same, and are not limited here.

[0219] Optionally, the avoidance structure can be at least one of the following: inclined slope, rounded corner, chamfer, and stepped structure.

[0220] In one embodiment, the angle formed between the avoidance structure and the surface of the second central magnet 223 facing away from the central magnetic plate 222 is greater than 90° and less than 180°. In this embodiment, the range of the angle formed between the avoidance structure and the surface of the second central magnet 223 facing away from the central magnetic plate 222 can be further selected as 100° to 150°, which is not limited here. Optionally, the angle can be 100°, 110°, 120°, 130°, 140°, 150°, etc., which is not limited here.

[0221] In one embodiment, the side magnet part 23 includes a side magnet 231 and a side magnetic plate 232 stacked together. The side magnet 231 is connected to the magnetic yoke 21. The side magnetic plate 232 is disposed opposite to the central magnetic plate 222. The side magnet 231 is magnetized along the vibration direction of the vibration system 3. The magnetization direction of the side magnet 231 is opposite to the magnetization direction of the first central magnet 221.

[0222] As can be understood, as shown in Figures 2 to 4 and Figure 7, the side magnet 231 and the side magnetic plate 232 of the side magnetic part 23 are stacked on the magnetic yoke 21, and the side magnet 231 is connected to the magnetic yoke 21. The side magnet 231 and the side magnetic plate 232 of the side magnetic part 23 are located outside the central magnetic part 22 and are spaced apart to form a magnetic gap 24. In this embodiment, the side magnet 231 may be a permanent magnet, and the side magnetic plate 232 may be a magnetic plate structure; no limitation is made here.

[0223] In this embodiment, multiple side magnetic sections 23 are included, which are arranged around the outside of the central magnetic section 22 and form magnetic gaps 24 with the central magnetic section 22 at intervals. At this time, a clearance space 233 is formed between adjacent side magnetic sections 23, thus providing installation clearance space and movement space for the inner fixing part 352 of the first vibrating plate 312 and the centering support. Optionally, multiple side magnets 231 and side magnetic guide plates 232 are arranged in a one-to-one correspondence.

[0224] As shown in Figures 15 and 16, the present invention also proposes a sound-generating module 600, which includes the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is as described in the foregoing embodiments. Since the sound-generating module 600 adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0225] In one embodiment, the sound-generating module 600 further includes a module housing 500, which has a mounting cavity 510 and a sound outlet 520 communicating with the mounting cavity 510. The sound-generating device 100 is disposed in the mounting cavity 510, and a front sound cavity 530 is formed between the first diaphragm assembly 31 of the sound-generating device 100 and the module housing 500. The front sound cavity 530 is communicating with the sound outlet 520. The sound-generating cavity 41 of the sound-generating device 100 is communicating with the sound outlet 520 through the front sound cavity 530. Alternatively, the module housing 500 is further provided with a sound outlet channel, through which the sound-generating cavity 41 of the sound-generating device 100 is communicating with the sound outlet 520. Alternatively, the sound outlet 111 of the sound-generating device 100 is directly connected to the sound outlet 520.

[0226] In this embodiment, the sound-emitting module 600 can be a front-emitting or side-emitting structure. When the sound-emitting module 600 is a front-emitting structure, the sound outlet 520 of the module housing 500 is directly opposite to the first diaphragm assembly 31 of the sound-emitting device 100. It can be understood that the sound outlet 111 on the outer shell 1 of the sound-emitting device 100 is disposed on the inner bend 113 of the first housing 11, and the sound outlet 111 is directly opposite to the sound outlet 520 of the module housing 500. In this case, the sound outlet 111 communicates with the front sound cavity 530; or, the sound outlet 111 communicates with the sound outlet 520 through the sound outlet channel of the module housing 500, which is not limited here.

[0227] Of course, the sound outlet 111 on the outer shell 1 can also be provided on the side wall 112 of the first shell 11. The sound outlet 111 is connected to the sound outlet 520 through the sound outlet channel of the module shell 500. This is not limited here.

[0228] Understandably, when the sound-emitting module 600 has a side-emitting structure, the sound outlet 520 of the module housing 500 is located on one side of the first diaphragm assembly 31 of the sound-emitting device 100. Understandably, the sound outlet 111 on the outer shell 1 of the sound-emitting device 100 is provided on the inner bend 113 of the first housing 11. In this case, the sound outlet 111 can communicate with the sound outlet 520 through the sound outlet channel of the module housing 500, which is not limited here.

[0229] Of course, the sound outlet 111 on the outer shell 1 can also be set on the side wall 112 of the first shell 11. In this case, the sound outlet 111 is connected to the sound outlet 520 through the sound outlet channel of the module shell 500; or, the sound outlet 111 and the sound outlet 520 of the module shell 500 are directly connected and arranged, which is not limited here.

[0230] In one embodiment, the sound-generating module 600 further includes a flexible circuit board, one end of which is electrically connected to the centering support 35 of the sound-generating device 100, and the other end of which is used to connect to an external power source.

[0231] Understandably, the flexible circuit board is used to connect and conduct external circuitry to the sound-generating device 100. The flexible circuit board has inner and outer pads. The inner pads of the flexible circuit board are connected and conduction-conducting with the outer pads of the centering support 35 of the sound-generating device 100, and the outer pads of the flexible circuit board are used to connect with external terminals.

[0232] In this embodiment, the module housing 500 has a mounting cavity 510, the sound-generating device 100 is disposed within the mounting cavity 510 of the module housing 500, and at least one end of the flexible circuit board connected to the sound-generating device 100 is located within the mounting cavity 510 of the module housing 500. Of course, in other embodiments, the flexible circuit board may also be entirely disposed within the mounting cavity 510 of the module housing 500, which is not limited here.

[0233] The present invention also proposes an electronic device including the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is as described in 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 about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0234] In this embodiment, the electronic device also includes a device housing, and the sound-generating device 100 and the flexible circuit board are both disposed within the device housing. It is understood that the electronic device can be headphones, a mobile phone, a smart wearable device, etc., and is not limited thereto.

[0235] The present invention also proposes an electronic device comprising the aforementioned sound-emitting module 600. The specific structure of the sound-emitting module 600 is as described in the foregoing embodiments. Since this electronic device employs all the technical solutions of all the foregoing embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be elaborated upon here.

[0236] It is understood that the electronic device can be headphones, mobile phones, smart wearable devices, etc., and is not limited thereto. In this embodiment, the electronic device also includes a device housing, and the sound-emitting module 600 is disposed inside the device housing.

[0237] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings 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-generating device, characterized in that, The sound-generating device includes: The outer casing is provided with a sound outlet; A magnetic circuit system, the magnetic circuit system being connected to the housing, the magnetic circuit system being provided with a magnetic gap; and A vibration system comprising a first diaphragm assembly, a second diaphragm assembly, a voice coil, and a diaphragm. The first diaphragm assembly includes an inner folded ring, a first diaphragm plate, and an outer folded ring connected in sequence. The inner side of the inner folded ring is connected to the magnetic circuit system, and the outer periphery of the outer folded ring is connected to the outer shell. One end of the voice coil is connected to the first diaphragm plate, and the other end of the voice coil is suspended within the magnetic gap. The diaphragm and the second diaphragm assembly are sequentially disposed on the side of the first diaphragm assembly facing the voice coil and located outside the voice coil. The outer edges of both the diaphragm and the second diaphragm assembly are connected to the outer shell, and the inner edges of both the diaphragm and the second diaphragm assembly are connected to the first diaphragm assembly, thereby forming a sound-generating cavity communicating with the sound outlet between the diaphragm and the second diaphragm assembly.

2. The sound-generating device as described in claim 1, characterized in that, The second diaphragm assembly includes a folded ring portion and a second vibrating plate. The outer periphery of the folded ring portion is connected to the outer shell. The second vibrating plate includes a main body portion connected to the inner edge of the folded ring portion and a first bent portion formed by bending and extending the main body portion toward the first diaphragm assembly. The first bent portion is connected to the inner edge of the first diaphragm assembly and / or the diaphragm.

3. The sound-generating device as described in claim 2, characterized in that, An inclined portion is formed at the connection between the main body and the first bent portion, and the inclined portion is set at an angle to the vibration direction of the vibration system. And / or, the outer periphery of the folded ring is bent to form a first flange, and the first flange is connected to the outer wall of the outer shell.

4. The sound-generating device as described in claim 2, characterized in that, The magnetic circuit system includes a magnetic yoke and a central magnetic part and a side magnetic part disposed on the magnetic yoke. The side magnetic part is located outside the central magnetic part and forms the magnetic gap with the central magnetic part. The inner side of the inner folded ring is connected to the central magnetic part. The side magnetic part includes multiple parts, and a clearance space is formed between two adjacent side magnetic parts. The second diaphragm has a first extension extending into the clearance space, and the diaphragm has a second extension extending into the clearance space, with the second extension corresponding to and connected to the first extension; or, the voice coil has a first protrusion extending into the clearance space, and the central magnet has a second protrusion extending into the clearance space, with the first protrusion and the second protrusion disposed opposite to each other.

5. The sound-generating device as described in claim 2, characterized in that, The diaphragm is a flexible component, comprising an outer connecting part, a deformable part, and an inner connecting part connected in sequence. The outer periphery of the outer connecting part is connected to the outer shell, and the inner edge of the inner connecting part is connected to the first diaphragm assembly and / or the first bending part. The deformable part is bent.

6. The sound-generating device as described in claim 5, characterized in that, The inner edge of the inner connecting portion extends along the inner surface of the first diaphragm assembly to form a second flange, and the first bent portion forms a straight section extending along the inner surface of the first diaphragm assembly at one end adjacent to the first diaphragm assembly. Wherein, the second flange is sandwiched between the first diaphragm assembly and the straight section; or, the straight section is sandwiched between the second flange and the first diaphragm assembly; or, the second flange and the straight section are respectively connected to the first diaphragm assembly.

7. The sound-generating device as described in claim 5, characterized in that, Along the vibration direction of the vibration system, the projected width L1 of the deformed part is greater than or equal to the projected width L2 of the deformed segment of the folded ring part, and the ratio of L1 to L2 is 1:1 to 3:

1. And / or, the deformable portion protrudes in a direction away from the first diaphragm assembly, the deformable segment of the folded ring protrudes in a direction close to the first diaphragm assembly, and the deformable portion and the deformable segment of the folded ring are misaligned in a direction perpendicular to the vibration system; And / or, both the inner folded ring and the outer folded ring protrude in a direction away from the magnetic circuit system; And / or, the compliance of the diaphragm is greater than or equal to the compliance of the folded portion.

8. The sound-generating device as claimed in claim 1, characterized in that, The effective vibration area Sd1 of the diaphragm is smaller than the effective vibration area Sd2 of the second diaphragm assembly.

9. The sound-generating device as described in claim 8, characterized in that, The ratio of Sd1 to Sd2 is 1:1.5 to 1:

3.

10. The sound-generating device as claimed in claim 1, characterized in that, The first diaphragm plate bends and extends toward the voice coil to form a second bend, and the second bend is connected to the voice coil; or, the first diaphragm assembly further includes a first support, and the two ends of the first support are respectively connected to the first diaphragm plate and the voice coil. And / or, the inner edge of the diaphragm and the inner edge of the second diaphragm assembly are both connected to the first vibrating plate; the first vibrating plate is provided with a protrusion facing toward the diaphragm, and the inner edge of the diaphragm and the inner edge of the second diaphragm assembly are both connected to the protrusion; or, the first diaphragm assembly further includes a second bracket, one end of the second bracket is connected to the first vibrating plate, and the other end of the second bracket is connected to the inner edge of the diaphragm and the inner edge of the second diaphragm assembly; And / or, the outer periphery of the outer fold ring is bent and extended to form a third flange, which is connected to the outer wall of the outer shell.

11. The sound-generating device as claimed in claim 1, characterized in that, The first diaphragm assembly and the diaphragm together form a first rear cavity, and the first diaphragm assembly, the second diaphragm assembly, the outer shell and the magnetic circuit system together form a second rear cavity; The first vibrating plate has a protrusion that faces toward the diaphragm, and the inner edge of the diaphragm and the inner edge of the second diaphragm assembly are both connected to the protrusion. The protrusion is provided with an airflow channel connecting the first rear cavity and the second rear cavity.

12. The sound-generating device as claimed in claim 11, characterized in that, The airflow channels include multiple channels, which are spaced apart along the protrusion. And / or, the first diaphragm bends and extends toward the voice coil to form a second bend, the second bend being connected to the voice coil, and the second bend having a notch.

13. The sound-generating device as claimed in claim 1, characterized in that, The vibration system further includes a centering support, which includes an outer fixing part, an inner fixing part, and a vibration arm connecting the outer fixing part and the inner fixing part. The outer fixing part is connected to the outer shell. The second diaphragm assembly includes a folded ring portion and a second vibrating plate connected together. The outer periphery of the folded ring portion is connected to the outer shell, and the inner edge of the second vibrating plate is connected to the inner edge of the first diaphragm assembly and / or the diaphragm. The inner fixing part is connected to the second diaphragm and the voice coil, and is electrically connected to the lead wire of the voice coil.

14. The sound-generating device as claimed in claim 13, characterized in that, The inner fixing part includes a body part and a third extension part extending from the body part toward the voice coil. The body part is connected to the second diaphragm, and the third extension part is connected to the voice coil. The third extension part or the body part is provided with an inner solder pad that is electrically connected to the lead wire of the voice coil. And / or, the external fixing part is arranged in a ring shape, the external fixing part has alternating short axis side and long axis side, the vibration arm is led out from the side of the internal fixing part corresponding to the short axis side and bends and extends along the long axis side, and the vibration arm is connected to the central area of ​​the long axis side; And / or, the centering support further includes a conductive part, one end of which is connected to the outer fixing part, and the other end of which extends in a direction away from the outer shell and is provided with an external solder pad.

15. The sound-generating device as claimed in claim 1, characterized in that, The magnetic circuit system includes a magnetic yoke and a central magnetic part and a side magnetic part disposed on the magnetic yoke. The side magnetic part is located outside the central magnetic part and forms the magnetic gap with the central magnetic part. The central magnetic part includes a first central magnet, a central magnetic plate and a second central magnet stacked together. The first central magnet is connected to the magnetic yoke, and the inner side of the inner folded ring is connected to the second central magnet. The first central magnet and the second central magnet are both magnetized along the vibration direction of the vibration system, but in opposite directions.

16. The sound-generating device as claimed in claim 15, characterized in that, The vibration system further includes a centering support, which includes an outer fixing part, an inner fixing part, and a vibration arm connecting the outer fixing part and the inner fixing part. The outer fixing part is connected to the outer shell, and the inner fixing part is connected to the voice coil and electrically connected to the lead wire of the voice coil. Wherein, the magnetic yoke is provided with a clearance structure corresponding to the inner fixing part, the clearance structure being a recessed groove or a through hole; and / or, the side magnetic part includes multiple parts, a clearance space is formed between two adjacent side magnetic parts, the voice coil has a first protrusion extending to the clearance space, and the first protrusion is connected to the inner fixing part; And / or, the edge magnetic part includes an edge magnet and an edge magnetic plate stacked together, the edge magnet is connected to the magnetic yoke, the edge magnetic plate is disposed opposite to the central magnetic plate, and the magnetization direction of the edge magnet is opposite to the magnetization direction of the first central magnet.

17. The sound-generating device as claimed in claim 1, characterized in that, The outer casing includes a first casing and a second casing. The first casing is provided with the sound outlet. The outer periphery of the outer folding ring and the outer periphery of the diaphragm are both connected to the first casing. The magnetic circuit system is connected to the second casing. The outer periphery of the second diaphragm assembly is sandwiched between the first casing and the second casing.

18. The sound-generating device as claimed in claim 17, characterized in that, The first housing has a sidewall and an inner bend formed by bending and extending the sidewall away from the second housing toward the inward side. The outer fold ring and the outer periphery of the diaphragm are both connected to the inner bend. The outer periphery of the second diaphragm assembly is sandwiched between the end of the sidewall away from the inner bend and the second housing. The sound outlet is located on the side wall or the inner bend.

19. The sound-generating device as claimed in claim 18, characterized in that, The inner bend includes an upper surface, a lower surface, and an inner surface. The upper surface and the lower surface are arranged opposite to each other. The inner surface connects the upper surface and the lower surface and is located at the end of the inner bend away from the sidewall. The outer periphery of the outer fold ring is connected to the upper surface, and the outer periphery of the diaphragm is connected to the lower surface; or, the outer periphery of the outer fold ring is connected to the upper surface, and the outer periphery of the diaphragm is sandwiched between the outer periphery of the outer fold ring and the upper surface.

20. The sound-generating device as claimed in claim 17, characterized in that, The first housing is a metal housing, and the second housing is a metal housing; The first housing has a welding portion extending toward the magnetic circuit system, the welding portion being welded to the magnetic circuit system or the second housing; and / or, the magnetic circuit system or the second housing has a welding portion extending toward the first housing, the welding portion being welded to the outer wall of the first housing; and / or, the sound-generating device further includes a metal welding piece, one end of the metal welding piece being welded to the magnetic circuit system or the second housing, and the other end of the metal welding piece being welded to the outer wall of the first housing; And / or, the second housing and the magnetic yoke of the magnetic circuit system are integrally formed; And / or, the vibration system further includes a centering support, the centering support including an outer fixing part, an inner fixing part and a vibration arm connecting the outer fixing part and the inner fixing part, the outer fixing part being sandwiched between the outer periphery of the second housing and the second diaphragm assembly, the inner fixing part being connected to the voice coil and electrically connected to the lead wire of the voice coil.

21. A sound-generating module, characterized in that, The sound-generating module includes: A module housing, the module housing having a mounting cavity and a sound outlet communicating with the mounting cavity; and The sound-generating device as described in any one of claims 1 to 20, wherein the sound-generating device is disposed in the mounting cavity, a front acoustic cavity is formed between the first diaphragm assembly of the sound-generating device and the module housing, and the front acoustic cavity is in communication with the sound outlet; Wherein, the sound-generating cavity of the sound-generating device is connected to the sound outlet through the front sound cavity; or, the module housing is further provided with a sound outlet channel, and the sound-generating cavity of the sound-generating device is connected to the sound outlet through the sound outlet channel; or, the sound outlet hole of the sound-generating device is directly connected to the sound outlet.

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