Sound production device and sound production module

Abstract

The utility model discloses a sounding device and a sounding module, and relates to the technical field of electroacoustic transduction, the inner side of an inner folding ring of a first vibrating diaphragm assembly of the sounding device is connected with a central magnetic part, and a diaphragm and a second vibrating diaphragm assembly are sequentially arranged on one side, facing a magnetic conductive yoke, of the first vibrating diaphragm assembly; the diaphragm is arranged in the shell, a sound production cavity communicated with a sound production hole of the shell is formed between the diaphragm and the second diaphragm assembly, the diaphragm is a flexible piece, and the two ends of the rigid connecting piece are connected with the second diaphragm assembly and the voice coil respectively, so that the voice coil drives the second diaphragm assembly to vibrate through the rigid connecting piece; the outer periphery of the outer folding ring and the outer periphery of the diaphragm are both connected with the first shell, the magnetic conductive yoke is connected with the second shell, and the outer periphery of the second diaphragm assembly is clamped between the first shell and the second shell. According to the sounding device, the effective vibration area of a vibration system is increased, and the acoustic performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electroacoustic transduction technical field, especially a kind of sound production device and the sound production module of application this sound production device. 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. Sound production device is an important electroacoustic transduction component in consumer electronics, which is widely used as loudspeaker, earphone, earphone, etc. With the performance improvement 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 utility model is to provide a sound production device and 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 product size under the same performance conditions.

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

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

[0007] A magnetic circuit system is connected to the shell, which comprises a magnetic yoke, a center magnetic part and a side magnetic part provided in the magnetic yoke, the side magnetic part is located outside the center magnetic part and forms a magnetic gap with the center magnetic part, the center magnetic part comprises a first center magnet, a center magnetic plate and a second center magnet arranged in layers, and the first center magnet is connected with the magnetic yoke; and

[0008] A vibration system comprises a first diaphragm assembly, a second diaphragm assembly, a voice coil, a diaphragm and a rigid connecting member, the first diaphragm assembly comprises an inner folding ring, a first vibrating plate and an outer folding ring connected in sequence, the inner side of the inner folding ring is connected with the second center magnet, the outer periphery of the outer folding ring is connected with the shell, one end of the voice coil is connected with the first diaphragm assembly, the other end of the voice coil is suspended in the magnetic gap, the diaphragm and the second diaphragm assembly are sequentially arranged on the side of the first diaphragm assembly facing the magnetic yoke and outside the voice coil, the diaphragm is a flexible member, the outer edges of the diaphragm and the second diaphragm assembly are connected with the shell, the inner edge of the diaphragm is connected with the inner edge of the second diaphragm assembly to form a sound generating cavity communicating with the sound hole between the diaphragm and the second diaphragm assembly, one end of the rigid connecting member is connected with the second diaphragm assembly, the other end of the rigid connecting member is connected with the voice coil, so that the voice coil drives the second diaphragm assembly to vibrate through the rigid connecting member.

[0009] The first center magnet and the second center magnet are magnetized along the vibration direction of the vibration system and have opposite magnetization directions, the shell comprises a first shell and a second shell, the first shell is provided with the sound hole, the outer periphery of the outer folding ring and the outer periphery of the diaphragm are connected with the first shell, the magnetic yoke is connected with the second shell, and the outer periphery of the second diaphragm assembly is clamped between the first shell and the second shell.

[0010] In an embodiment, the first shell has a side wall and an inner folding part formed by the side wall extending towards the inside from one end away from the second shell, the outer periphery of the outer folding ring and the diaphragm are connected to the inner folding part, and the outer periphery of the second diaphragm assembly is clamped between one end of the side wall away from the inner folding part and the second shell.

[0011] The sound hole is arranged on the side wall or the inner folding part.

[0012] In an embodiment, the inner folding part comprises an upper surface, a lower surface and an inner side surface, the upper surface and the lower surface are arranged in opposite directions, the inner side surface connects the upper surface and the lower surface and is located at one end of the inner folding part away from the side wall.

[0013] The outer periphery of the outer folding 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 folding ring is connected to the upper surface, and the outer periphery of the diaphragm is clamped between the outer periphery of the outer folding ring and the upper surface.

[0014] In an embodiment, the first shell is a metal shell, and the second shell is a metal shell.

[0015] The first shell is provided with a welding portion extending towards the magnetic yoke, which is welded to the magnetic yoke or the second shell; and / or the magnetic yoke or the second shell is provided with a welding portion extending towards the first shell, which is welded to the outer wall of the first shell; and / or the sound generating device further comprises a metal welding sheet, one end of which is welded to the magnetic yoke or the second shell, and the other end of which is welded to the outer wall of the first shell.

[0016] The second shell and the magnetic yoke are integrally formed.

[0017] In an embodiment, the first diaphragm assembly further comprises a support, two ends of the support being connected to the first vibrating plate and the voice coil respectively.

[0018] The outer periphery of the outer folding ring is folded to form a third flange, which is connected to the outer wall of the first shell.

[0019] In an embodiment, the second diaphragm assembly comprises a folding ring portion and a second vibrating plate, the outer periphery of the folding ring portion being clamped between the first shell and the second shell, the second vibrating plate comprising a main body portion connected to the inner edge of the folding ring portion and a first folded portion formed by folding the main body portion towards the diaphragm, the first folded portion being connected to the inner edge of the diaphragm.

[0020] In an embodiment, the effective vibration area Sd1 of the diaphragm is less than the effective vibration area Sd2 of the second diaphragm assembly, and the ratio of Sd1 to Sd2 is 1:1.5-1:3.

[0021] The connection between the main body portion and the first folded portion forms an inclined portion, which is arranged at an angle to the vibration direction of the vibration system.

[0022] The outer periphery of the folding ring portion is folded to form a first flange, which is connected to the outer wall of the first shell or the second shell.

[0023] In an embodiment, the diaphragm comprises an outer connecting portion, a deformation portion and an inner connecting portion connected in sequence, the outer periphery of the outer connecting portion being connected to the first shell, the inner edge of the inner connecting portion being connected to the first folded portion, and the deformation portion being in a folded shape.

[0024] In an embodiment, an inner edge of the inner connecting part is bent to extend towards the first bending part to form a second flange connected with the first bending part.

[0025] And / or, in a vibration direction of the vibration system, a projection width L1 of the deformation part is greater than or equal to a projection width L2 of the folded ring part, a ratio of L1 to L2 is 1:1-3:1.

[0026] And / or, the deformation part is convex towards a direction away from the first diaphragm assembly, the folded ring part is convex towards a direction close to the first diaphragm assembly, and the deformation part and the folded ring part are arranged in a staggered manner in a direction perpendicular to the vibration system.

[0027] And / or, the inner folded ring and the outer folded ring are both convex towards a direction away from the magnetic circuit system.

[0028] And / or, a flexibility of the diaphragm is greater than a flexibility of the folded ring part.

[0029] In an embodiment, the vibration system further comprises a centering support sheet, the centering support sheet comprises an outer fixed part, an inner fixed part and a vibration arm connecting the outer fixed part and the inner fixed part, and the rigid connecting piece is arranged at the inner fixed part.

[0030] The second diaphragm assembly comprises a folded ring part and a second vibration plate connected with each other, an outer periphery of the folded ring part and the outer fixed part are arranged between the first shell and the second shell, and an inner edge of the second vibration plate is connected with an inner edge of the diaphragm.

[0031] The inner fixed part is connected with the second vibration plate and the voice coil, and is electrically connected with a lead wire of the voice coil.

[0032] In an embodiment, the side magnetic part comprises a side magnet and a side magnetic guide plate arranged in a stacked manner, the side magnet is connected with the magnetic guide yoke, the side magnetic guide plate is arranged opposite to the center magnetic guide plate, and a magnetization direction of the side magnet is opposite to a magnetization direction of the first center magnet.

[0033] And / or, the magnetic guide yoke is provided with a relief structure corresponding to the rigid connecting piece, and the relief structure is a recessed groove or a through hole.

[0034] The utility model also provides a sound production module, the sound production module comprises:

[0035] A module shell is provided with a mounting cavity and a sound outlet communicating with the mounting cavity; and

[0036] The sound generating device is arranged in the mounting cavity, and a front sound cavity is formed between a first diaphragm assembly of the sound generating device and the module shell, and the front sound cavity is communicated with the sound outlet.

[0037] The sound generating cavity of the sound generating device is communicated with the sound outlet through the front sound cavity, or the module shell is further provided with a sound outlet channel, and the sound generating cavity of the sound generating device is communicated with the sound outlet through the sound outlet channel, or the sound outlet hole of the sound generating device is directly communicated with the sound outlet.

[0038] The sound generating device of the technical scheme of the utility model through the shell of the magnetic circuit system and the vibration system are housed, and the magnetic circuit system is arranged as a magnetic yoke and a center magnetic part and a side magnetic part arranged on the magnetic yoke, so that the side magnetic part is located outside the center magnetic part and forms a magnetic gap with the center magnetic part, and the vibration system is arranged as a first diaphragm assembly, a second diaphragm assembly, a voice coil, a diaphragm and a rigid connecting piece, so that the inner side of the inner folding ring of the first diaphragm assembly is connected with the center magnetic part, the outer periphery of the outer folding ring is connected with the shell, one end of the voice coil is connected with the first diaphragm assembly, and the other end of the voice coil is suspended in the magnetic gap, so that the electric current is passed through the voice coil, so that the voice coil converts the electric energy into mechanical energy in the magnetic gap formed by the magnetic circuit system, so as to drive the voice coil to drive the first diaphragm assembly to vibrate, so as to realize sound generation, and the center magnetic part is arranged as a magnetic structure, that is, the center magnetic part comprises a first center magnet, a center magnetic plate and a second center magnet arranged in layers, the first center magnet and the second center magnet are magnetized along the vibration direction of the vibration system and the magnetization directions are opposite, so that the magnetic field strength of the magnetic circuit system of the sound generating device can be improved, and the performance of the sound generating device can be improved as a whole; at the same time, the diaphragm and the second diaphragm assembly are arranged on one side of the first diaphragm assembly facing the magnetic yoke in sequence and are located outside the voice coil, so that the outer edges of the diaphragm and the second diaphragm assembly are connected with the shell, and the inner edge of the diaphragm is connected with the inner edge of the second diaphragm assembly, so as to form a sound generating cavity between the diaphragm and the second diaphragm assembly, the diaphragm is a flexible piece, and the sound outlet hole is arranged on the shell, so that the sound generating cavity is communicated with the sound outlet hole, and one end of the rigid connecting piece is connected with the second diaphragm assembly, and the other end of the rigid connecting piece is connected with the voice coil, so that the voice coil drives the second diaphragm assembly to vibrate through the rigid connecting piece, so that the volume between the diaphragm and the second diaphragm assembly changes relatively to smoothly flow the air in the sound generating cavity through the sound outlet hole, so as to increase the effective vibration area of the sound generating device when vibrating, so as to improve the performance of the sound generating device; further, the shell is arranged as a first shell and a second shell, so that the first shell is used to fix and install the outer periphery of the first diaphragm assembly and the diaphragm, the second shell is used to install and fix the magnetic circuit system, and the first shell and the second shell are used to install and fix the outer periphery of the second diaphragm assembly. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0040] Figure 1 A top view of an embodiment of the sound-generating device provided by this utility model;

[0041] Figure 2 A bottom view of an embodiment of the sound-generating device provided by this utility model;

[0042] Figure 3 An exploded view of an embodiment of the sound-generating device provided by this utility model;

[0043] Figure 4 A cross-sectional schematic diagram of an embodiment of the sound-generating device provided by this utility model;

[0044] Figure 5 A cross-sectional schematic diagram from another perspective of an embodiment of the sound-generating device provided by this utility model;

[0045] Figure 6 A schematic diagram of another embodiment of the sound-generating device provided by this utility model;

[0046] Figure 7 A partial top view of an embodiment of the sound-generating device provided by this utility model;

[0047] Figure 8 A top view of the magnetic circuit system connected to the centering support and rigid connector in one embodiment of the sound-generating device provided by this utility model;

[0048] Figure 9 for Figure 8 A schematic diagram of the decomposition process;

[0049] Figure 10 A top view of the magnetic circuit system connected to the centering support and rigid connector in another embodiment of the sound-generating device provided by this utility model;

[0050] Figure 11 This is an exploded view of the centering support and rigid connector in one embodiment of the present invention;

[0051] Figure 12 This is a schematic diagram of the centering support and rigid connector in another embodiment of the present invention;

[0052] Figure 13 It is the structure schematic view of diaphragm in one embodiment of the utility model;

[0053] Figure 14 It is the structure schematic view of second vibrating plate in one embodiment of the utility model;

[0054] Figure 15 It is the structure schematic view of second vibrating plate in another embodiment of the utility model;

[0055] Figure 16 It is the cross section schematic view of one embodiment of sound production module provided by the utility model;

[0056] Figure 17 It is the cross section schematic view of another view of one embodiment of sound production module provided by the utility model.

[0057] Explanation of drawing reference numeral:

[0058] 100, sound production device, 1, shell, 11, first shell, 111, sound hole, 112, side wall, 113, inner bending part, 12, second shell, 121, welding part, 2, magnetic circuit system, 21, magnetic yoke, 211, avoiding structure, 22, center magnetic part, 221, first center magnet, 222, center magnetic conducting plate, 223, second center magnet, 224, second protruding part, 23, edge magnetic part, 231, edge magnet, 232, edge magnetic conducting plate, 233, avoiding space, 24, magnetic gap, 3, vibrating system, 31, first diaphragm assembly, 311, inner bending ring, 312, first vibrating plate, 3121, second bending part, 313, outer bending ring, 3131, third flange, 32, second diaphragm assembly, 321, bending ring part, 3211, first flange, 322, second vibrating plate, 3221, main body part, 3222, first bending part, 3223, inclined part, 3224, first extension part, 33, voice coil, 331, first protruding part, 34, diaphragm, 341, outer connecting part, 342, deformation part, 343, inner connecting part, 3431, second flange, 344, second extension part, 35, rigid connecting piece, 351, rigid connecting part, 352, fourth extension part, 36, centering support sheet, 361, outer fixed part, 362, inner fixed part, 3621, main body part, 3622, third extension part, 3623, inner solder pad, 363, vibrating arm, 364, conductive part, 365, outer solder pad, 4, sound production cavity, 500, module shell, 510, mounting cavity, 520, sound outlet, 530, front sound cavity, 600, sound production module.

[0059] The realization, functional characteristics and advantages of the utility model will be further explained by combining with embodiments and referring to the drawings. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0061] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0062] Meanwhile, "and / or" or "and / or" appearing throughout the text means that three schemes are included, taking "A and / or, B" as an example, including A scheme, or B scheme, or A and B schemes are satisfied at the same time.

[0063] In addition, in the present application, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0064] In recent years, with the rapid development of consumer electronics, people's requirements for electronic products are constantly improving. In addition to the performance differences of the products themselves, for example, portability, comfort are the key aspects that people focus on. The current conventional loudspeaker scheme is difficult to simultaneously meet the design requirements of high performance, thin and light, etc.

[0065] The sound generating device is an important electro-acoustic transduction component in consumer electronics, which is widely used as a loudspeaker, a receiver, a headset, etc. With the improvement of the performance of electronic products, the improvement of the acoustic performance of the sound generating device is also an inevitable trend.

[0066] The sound production device of the related art comprises a frame, a vibration system fixed to the frame, and a magnetic circuit system with a magnetic gap, the magnetic circuit system drives the vibration system to vibrate and produce sound, the vibration system comprises a diaphragm fixed to the frame for vibrating to produce 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, that is, the sound production device drives the diaphragm in the vibration system to vibrate repeatedly to push air and produce sound. The diaphragm directly affects the acoustic performance of the sound production device as a core component of the sound production device, the effective vibration area (Sd) of the diaphragm is one of the important factors affecting the acoustic performance of the sound production device, and the larger the effective vibration area of the diaphragm, the better the acoustic performance of the sound production device.

[0067] However, in the sound production device of the related art, the vibration system and the magnetic circuit system are in a stacked structure, and the structure of the magnetic circuit system is limited in the sound production device of the same height, thereby limiting the BL value of the magnetic field thereof; in addition, the effective vibration area of the diaphragm of the sound production device of the related art is small, which affects the acoustic performance of the sound production device.

[0068] Based on the above ideas and problems, the utility model provides a sound production device 100. It can be understood that the sound production device 100 is applied to an electronic device, which can be a mobile phone, earphones, smart wearable devices, etc., which are not limited herein. In the embodiment, the sound production device 100 of the utility model increases the diaphragm 34 and the second diaphragm assembly 32 on the basis of the conventional loudspeaker, and the volume between the diaphragm 34 and the second diaphragm assembly 32 changes relatively to push air when the sound production device 100 works, thereby increasing the effective vibration area when the sound production device 100 vibrates, and improving the performance of the sound production device 100.

[0069] It can be understood that the sound production device 100 of the utility model increases the effective vibration area in the Z direction space of the sound production device 100, thereby increasing the effective vibration area (Sd) of the sound production device 100, and at the same time, making up for the loss of Sd of the first diaphragm assembly 31 due to the increase of the magnet in the intermediate magnetic circuit, and because the magnet is increased in the intermediate magnetic circuit, the magnetic field strength of the magnetic gap 24 is improved, thereby improving the performance of the sound production device 100. The sound production device 100 of the utility model considers its high performance and thin solution at the same time, and compared with the conventional loudspeaker, the performance of the sound production device 100 is improved under the same amplitude condition, and the amplitude of the sound production device 100 can be reduced under the condition of the same performance, so that the product size is realized to be light and thin.

[0070] Please refer to Figures 1 to 15As shown, in the utility model embodiment, the sound production device 100 includes a shell 1, a magnetic circuit system 2 and a vibration system 3, the shell 1 is provided with a sound hole 111, the magnetic circuit system 2 is connected to the shell 1, the magnetic circuit system 2 includes a magnetic yoke 21 and a center magnetic part 22 and a side magnetic part 23 arranged on the magnetic yoke 21, the side magnetic part 23 is located on the outside of the center magnetic part 22 and forms a magnetic gap 24 with the center magnetic part 22, the center magnetic part 22 includes a first center magnet 221, a center magnetic plate 222 and a second center magnet 223 arranged in layers, the first center magnet 221 and the second center magnet 223 are magnetized along the vibration direction of the vibration system 3 and the magnetization directions are opposite, the first center magnet 221 is connected to the magnetic yoke 21, the vibration system 3 includes a first diaphragm assembly 31, a second diaphragm assembly 32, a voice coil 33, a diaphragm 34 and a rigid connecting piece 35, the first diaphragm assembly 31 includes an inner folding ring 311, a first vibration plate 312 and an outer folding ring 313 connected in sequence, the inner side of the inner folding ring 311 is connected to the second center magnet 223, the outer periphery of the outer folding ring 313 is connected to the shell 1, one end of the voice coil 33 is connected to the first diaphragm assembly 31, 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 arranged on the side of the first diaphragm assembly 31 facing the magnetic yoke 21 and are located on the outside of the voice coil 33, the diaphragm 34 is a flexible piece, the outer edges of the diaphragm 34 and the second diaphragm assembly 32 are connected to the shell 1, the inner edge of the diaphragm 34 is connected to the inner edge of the second diaphragm assembly 32 to form a sound production cavity 4 communicating with the sound hole 111 between the diaphragm 34 and the second diaphragm assembly 32, one end of the rigid connecting piece 35 is connected to the second diaphragm assembly 32, the other end of the rigid connecting piece 35 is connected to the voice coil 33 to drive the second diaphragm assembly 32 to vibrate through the rigid connecting piece 35; wherein the shell 1 includes a first shell 11 and a second shell 12, the first shell 11 is provided with the sound hole 111, the outer periphery of the outer folding ring 313 and the outer periphery of the diaphragm 34 are connected to the first shell 11, the magnetic yoke 21 is connected to the second shell 12, and the outer periphery of the second diaphragm assembly 32 is clamped between the first shell 11 and the second shell 12.

[0071] In the embodiment, the sound production device 100 can be a sound production unit of a loudspeaker, and the loudspeaker can be a micro loudspeaker.

[0072] Optionally, the magnetic circuit system 2 is square-shaped. For example, the magnetic circuit system 2 can include the center magnetic part 22 and the side magnetic part 23 which are both square-shaped. In the embodiment, the vibration system 3 is optionally square-shaped. It can be understood that the first diaphragm assembly 31 of the vibration system 3 can be connected to the magnetic circuit system 2, or the magnetic circuit system 2 and the vibration system 3 are respectively assembled on the loudspeaker shell, which is not limited herein.

[0073] In order to better assemble the magnetic circuit system 2 and the vibration system 3 of the sound production device 100. In an embodiment, as shown in Figures 3 to 6 The sound production device 100 further comprises a housing 1, and the magnetic circuit system 2 and the vibration system 3 are connected to the housing 1. Specifically, the magnetic yoke 21 of the magnetic circuit system 2 is connected to one end of the housing 1, the peripheral edge of the first diaphragm assembly 31 of the vibration system 3 is connected to the other end of the housing 1, and the inner peripheral edge of the first diaphragm assembly 31 is connected to the central magnetic part 22 of the magnetic circuit system 2.

[0074] In the embodiment, the housing 1 is used to mount, fix and support the components such as the magnetic circuit system 2 and the vibration system 3, that is, the housing 1 provides a mounting basis for the components such as the magnetic circuit system 2 and the vibration system 3. It can be understood that the housing 1 can be an integral structure or a plurality of split structures cooperatively formed, which is not limited herein. In the embodiment, the housing 1 can be a square frame structure, that is, the housing 1 has a cavity with two open ends, and the magnetic circuit system 2 and the vibration system 3 are connected to the two sides of the housing 1, so that the magnetic circuit system 2, the housing 1 and the first diaphragm assembly 31 of the vibration system 3 form a vibration cavity.

[0075] In the embodiment, the housing 1 is used to accommodate and fix the structures such as the vibration system 3 and the magnetic circuit system 2, so that the sound production device 100 can be applied as an independent component in electronic equipment or a sound production module, which is not limited herein.

[0076] In an embodiment, the housing 1 comprises a first shell 11 and a second shell 12, the first shell 11 is provided with a sound hole 111, the outer peripheral edge of the outer folding ring 313 and the outer peripheral edge of the diaphragm 34 are connected to the first shell 11, the magnetic yoke 21 is connected to the second shell 12, and the outer peripheral edge of the second diaphragm assembly 32 is clamped between the first shell 11 and the second shell 12.

[0077] In the embodiment, as shown in Figures 3 to 6 , Figure 9 By setting the housing 1 as the first shell 11 and the second shell 12, the outer peripheral edge of the first diaphragm assembly 31 and the diaphragm 34 can be fixed and mounted by using the first shell 11, the magnetic circuit system 2 can be mounted and fixed by using the second shell 12, and the outer peripheral edge of the second diaphragm assembly 32 can be mounted and fixed by using the first shell 11 and the second shell 12.

[0078] It can be understood that the outer peripheral edge of the outer folding ring 313 of the first diaphragm assembly 31 and the outer peripheral edge of the diaphragm 34 are connected to the first shell 11, the magnetic yoke 21 is connected to the second shell 12, and the outer peripheral edge of the second diaphragm assembly 32 is clamped between the first shell 11 and the second shell 12.

[0079] In the embodiment, the magnetic circuit system 2 is arranged as the magnetic yoke 21, the central magnetic part 22 and the side magnetic part 23 arranged on the magnetic yoke 21, and the magnetic circuit system 2 is connected with the shell 1 through the periphery of the magnetic yoke 21. In the embodiment, the side magnetic part 23 is arranged outside the central magnetic part 22 and encloses the central magnetic part 22 to form the magnetic gap 24, so that the first diaphragm assembly 31 of the vibration system 3 is connected with the shell 1 away from one end of the magnetic yoke 21, the inner side of the first diaphragm assembly 31 is connected with the central magnetic part 22, and one end of the voice coil 33 is connected with the first diaphragm assembly 31, and the other end of the voice coil 33 is suspended in the magnetic gap 24. Thus, the current is passed through the voice coil 33, so that the voice coil 33 converts the electric energy into mechanical energy in the magnetic gap 24 formed by the magnetic circuit system 2, to drive the voice coil 33 to drive the first diaphragm assembly 31 to vibrate, thereby realizing sound generation. Further, the central magnetic part 22 is arranged as a magnetic structure, so that the first central magnet 221, the central magnetic guide plate 222 and the second central magnet 223 are sequentially stacked in the vertical direction on the magnetic yoke 21, 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 the magnetization direction of the second central magnet 223. Thus, the magnetic induction lines of the first central magnet 221 and the second central magnet 223 are gathered on the central magnetic guide plate 222 by the magnetic guiding effect of the central magnetic guide plate 222, and are transmitted to the magnetic gap 24 by the central magnetic guide plate 222, so that the central magnetic part 22 generates a magnetic field with strong magnetic field strength through the magnetic gap 24, thereby increasing the magnetic flux density of the magnetic gap 24, increasing the number of magnetic lines passing through the voice coil 33, increasing the magnetic field force acting on the voice coil 33, and effectively improving the BL value.

[0080] Meanwhile, the first diaphragm assembly 31 is arranged as the inner folding ring 311, the first vibration plate 312 and the outer folding ring 313 connected in sequence, so that the inner side of the inner folding ring 311 is connected with the central magnetic part 22, and the outer periphery of the outer folding ring 313 is connected with the shell 1, thereby realizing the fixed connection of the first diaphragm assembly 31, and improving the vibration performance and flexibility of the first diaphragm assembly 31 through the inner folding ring 311 and the outer folding ring 313. It can be understood that the first vibration plate 312 is connected with the voice coil 33, or the first vibration plate 312 is connected with the voice coil 33 through a connecting member or a skeleton, which is not limited herein.

[0081] Optionally, the first vibration plate 312 is made of metal material or fiber material. In the embodiment, the vibration plate is adhesively connected or integrally injection-molded with the outer folding ring 313 and the inner folding ring 311. It should be noted that the inner folding ring 311, the first vibration plate 312 and the outer folding ring 313 of the first diaphragm assembly 31 can also be an integrally formed structure, so as to ensure the structural strength of the first diaphragm assembly 31 and simplify the processing steps, which is not limited herein.

[0082] In the embodiment, the outer periphery of the first vibrating plate 312 forms a first stepped surface, and the inner periphery of the first vibrating plate 312 forms a second stepped surface; the inner side of the outer folded ring 313 extends along a direction perpendicular to the vibration direction of the vibration system 3 to form an inner ring portion, and the outer side of the inner folded ring 311 extends along a direction perpendicular to the vibration direction of the vibration system 3 to form an outer ring portion; wherein the inner ring portion is lapped on the first stepped surface and is bonded and connected with the first stepped surface, and the outer ring portion is lapped on the second stepped surface and is bonded and connected with the second stepped surface.

[0083] It can be understood that the first vibrating plate 312 is bonded and connected with 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 connected to the same side (for example, the upper surface of the first vibrating plate 312 or the lower surface of the first vibrating plate 312) 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 herein.

[0084] In the embodiment, as shown in Figure 1 , Figures 3 to 6 , the inner folded ring 311 of the first diaphragm assembly 31 can be a sealed structure, that is, the inner side of the inner folded ring 311 is in a flat plate shape, and the inner side of the inner folded ring 311 is connected and fitted with the side of the center magnetic portion 22 of the magnetic circuit system 2 away from the magnetic yoke 21.

[0085] Of course, in other embodiments, the first diaphragm assembly 31 can be selected as a ring structure. In the embodiment, the inner side of the inner folded ring 311 is provided with a hollow hole, and part of the center magnetic portion 22 is exposed in the hollow hole or part of the center magnetic portion 22 is arranged in the hollow hole, which is not limited herein.

[0086] In the embodiment, the outer folded ring 313 and the inner folded ring 311 of the first diaphragm assembly 31 can be convex structures protruding upward or concave structures recessing downward, which is not limited herein. In order to avoid the diaphragm 34 and the second diaphragm assembly 32, the outer folded ring 313 of the first diaphragm assembly 31 is optionally protruded away from the magnetic circuit system 2. It can be understood that in order to avoid the inner folded ring 311 of the first diaphragm assembly 31 interfering with the center magnetic portion 22 of the magnetic circuit system 2 during vibration, the inner folded ring 311 of the first diaphragm assembly 31 is optionally protruded away from the magnetic circuit system 2. Optionally, the inner folded ring 311 and the outer folded ring 313 are both protruded away from the magnetic circuit system 2.

[0087] In order to further increase the connection area of the outer folded ring 313 of the first diaphragm assembly 31 and the housing 1 and improve the stability, in the embodiment, as shown in Figures 3 to 6As shown, the outer periphery of the outer folding ring 313 is bent to extend to form a third flange 3131, and the third flange 3131 is connected to the outer wall of the shell 1. It can be understood that the outer periphery of the outer folding ring 313 has a flat portion parallel to the first vibrating plate 312, and the flat portion is connected to the end surface of the shell 1. The third flange 3131 is bent to extend from the outer side of the flat portion towards the direction close to the magnetic circuit system 2, so that the third flange 3131 is connected to the outer side wall of the shell 1, thereby increasing the connection area with the shell 1 and improving the connection stability and waterproof sealing performance.

[0088] In order to realize the electrical connection between the voice coil 33 and the external circuit. In an embodiment, as shown in Figures 3 to 12 The vibration system 3 further includes a centering support 36, one end of the centering support 36 is connected to the voice coil 33 and is in conduction with the lead wire of the voice coil 33, and the other end of the centering support 36 is connected to the shell 1.

[0089] It can be understood that the two ends of the centering support 36 are respectively electrically connected to the lead wire of the voice coil 33 and the external circuit. In the present embodiment, the centering support 36 can be arranged at the bottom of the voice coil 33, and the centering support 36 is located at the four corner positions of the sound generating device 100 or in the direction of the short axis or the long axis of the sound generating device 100. Of course, the centering support 36 can also be arranged at the top of the voice coil 33, and the centering support 36 is located between the voice coil 33 and the diaphragm 31, which is not limited here.

[0090] In the present embodiment, the diaphragm 34 and the second diaphragm assembly 32 of the vibration system 3 are sequentially arranged on the side of the first diaphragm assembly 31 facing the magnetic yoke 21 and located on the outer side of the voice coil 33, so that the outer edges of the diaphragm 34 and the second diaphragm assembly 32 are connected to the shell 1, the inner edge of the diaphragm 34 is connected to the inner edge of the second diaphragm assembly 32, to form a sound generating cavity 4 between the diaphragm 34 and the second diaphragm assembly 32, and a sound hole 111 is arranged on the shell 1, so that the sound generating cavity 4 communicates with the sound hole 111, and one end of the rigid connecting piece 35 is connected to the second diaphragm assembly 32, and the other end of the rigid connecting piece 35 is connected to the voice coil 33, so that the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting piece 35.

[0091] 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 second diaphragm assembly 32 to vibrate through the rigid connector 35, 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 4 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.

[0092] 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 thereto. The structure of the diaphragm 34 can be a structure capable of vibrating and deforming, and is not limited thereto. Optionally, the diaphragm 34 is a flexible component, and the diaphragm 34 is made of flexible materials such as a single-layer PEEK (polyether ether ketone) film or a composite PEEK (polyether ether ketone) film. It is understood that the rigid connector 35 is used to connect the voice coil 33 and the second diaphragm assembly 32, so that the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connector 35. The rigid connector 35 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 thereto.

[0093] It should be noted that the sound-generating cavity 4 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 4 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.

[0094] Optionally, the effective vibration area Sd1 of the diaphragm 34 is smaller than the effective vibration area Sd2 of the second diaphragm assembly 32, and the ratio of Sd1 to Sd2 is 1:1.5 to 1:3. In this embodiment, 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.

[0095] It can be understood that, in this way, when the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting piece 35, the second vibrating plate 322 of the second diaphragm assembly 32 drives the diaphragm 34 to vibrate and deform, so that the diaphragm 34 has a negative effect on the air volume, the second diaphragm assembly 32 has a positive effect on the air volume, and the volume change of the sound generating cavity 4 increases the air volume during work, thereby realizing the increase of the effective vibration area of the product.

[0096] The sound generating device 100 houses the magnetic circuit system 2 and the vibration system 3 in the shell 1, and sets the magnetic circuit system 2 as a magnetic yoke 21, a central magnetic part 22 and a side magnetic part 23 arranged on the magnetic yoke 21, so that 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, and sets the vibration system 3 as a first diaphragm assembly 31, a second diaphragm assembly 32, a voice coil 33, a diaphragm 34 and a rigid connecting piece 35, so that the inner side of the inner folding ring 311 of the first diaphragm assembly 31 is connected with the central magnetic part 22, the outer periphery of the outer folding ring 313 is connected with the shell 1, one end of the voice coil 33 is connected with the first diaphragm assembly 31, and the other end of the voice coil 33 is suspended in the magnetic gap 24, so that the voice coil 33 converts electric energy into mechanical energy in the magnetic gap 24 formed by the magnetic circuit system 2, to drive the voice coil 33 to drive the first diaphragm assembly 31 to vibrate, so as to realize sound generation, and the central magnetic part 22 is a magnetic structure, so that the magnetic field strength of the magnetic circuit system 2 of the sound generating device 100 is improved, and the performance of the sound generating device 100 is improved as a whole; meanwhile, the diaphragm 34 and the second diaphragm assembly 32 are arranged on one side of the first diaphragm assembly 31 facing the magnetic yoke 21 in sequence, and are located outside the voice coil 33, so that the outer edges of the diaphragm 34 and the second diaphragm assembly 32 are connected with the shell 1, and the inner edge of the diaphragm 34 is connected with the inner edge of the second diaphragm assembly 32, to form a sound generating cavity 4 between the diaphragm 34 and the second diaphragm assembly 32, and a sound outlet hole 111 is arranged on the shell 1, so that the sound generating cavity 4 is communicated with the sound outlet hole 111, and one end of the rigid connecting piece 35 is connected with the second diaphragm assembly 32, and the other end of the rigid connecting piece 35 is connected with the voice coil 33, so that the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting piece 35, so that the volume between the diaphragm 34 and the second diaphragm assembly 32 changes relatively to push the air in the sound generating cavity 4 to flow smoothly through the sound outlet hole 111, to increase the effective vibration area of the sound generating device 100 when vibrating, so as to improve the performance of the sound generating device 100; further, the effective vibration area Sd1 of the diaphragm 34 is smaller than the effective vibration area Sd2 of the second diaphragm assembly 32, so that the ratio of Sd1 to Sd2 is 1:1.With a ratio of 5 to 1:3, when the voice coil 33 drives the second diaphragm assembly 32 to vibrate via the rigid connector 35, the second vibrating plate 322 of the second diaphragm assembly 32 drives the diaphragm 34 to vibrate and deform. This causes the diaphragm 34 to have a reaction effect on pushing the air volume, while the second diaphragm assembly 32 has a positive effect on pushing the air volume. The volume change of the sound cavity 4 increases the volume of air pushed during operation, further increasing the effective vibration area of ​​the product. Furthermore, the outer shell 1 is configured as a first shell 11 and a second shell 12, facilitating the fixed installation of the first diaphragm assembly 31 and the diaphragm 34 using the first shell 11, and the installation and fixation of the magnetic circuit system 2 using the second shell 12. Simultaneously, the first shell 11 and the second shell 12 are used to install and fix the outer periphery of the second diaphragm assembly 32.

[0097] 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.

[0098] In this embodiment, as Figures 3 to 5 As shown, by providing a second bend 3121 on the first diaphragm 312, the second bend 3121 extends toward the voice coil 33, so that the first diaphragm 312 is connected to the voice coil 33 through the second bend 3121. Thus, the voice coil 33 is suspended in a more reasonable position within the magnetic gap 24 by the second bend 3121, so as to ensure the effect of the magnetic circuit system 2 driving the voice coil 33 to vibrate.

[0099] 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.

[0100] In another embodiment, the first diaphragm assembly 31 further includes a bracket, with its two ends connected to the first diaphragm plate 312 and the voice coil 33, respectively. It is understood that the 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 via the bracket. This allows the bracket to suspend the voice coil 33 at a reasonable position within the magnetic gap 24, ensuring the effective vibration of the voice coil 33 driven by the magnetic circuit system 2.

[0101] 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 sandwiched between the first housing 11 and the second housing 12. 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 diaphragm 34. The first bent portion 3222 is connected to the inner edge of the diaphragm 34.

[0102] In the embodiment, the folded ring portion 321 of the second diaphragm assembly 32 can be a convex structure protruding upward or a concave structure recessing downward, which is not limited herein. In order to facilitate the connection of the folded ring portion 321 and the shell 1, as shown in Figures 4 to 6 , the outer periphery of the folded ring portion 321 is bent to form a first flange 3211, and the first flange 3211 is connected with the outer wall of the first shell 11 or the second shell 12.

[0103] It can be understood that the first flange 3211 is formed by extending the outer periphery of the folded ring portion 321 along the vibration direction of the vibration system, and the first flange 3211 can be connected with the outer side wall of the first shell 11 of the shell 1, so as to increase the connection area of the folded ring portion 321 and the shell 1, and improve the connection stability and waterproof sealing performance. Of course, the outer side of the folded ring portion 321 has a horizontal portion extending along the direction perpendicular to the vibration direction of the vibration system, the horizontal portion is connected with the end surface of the shell 1, and the outer side of the horizontal portion extends along the vibration direction of the vibration system to form the first flange 3211, which is not limited herein.

[0104] In the embodiment, by setting the second vibration plate 322 as the main body portion 3221 and the first bent portion 3222, the end of the main body portion 3221 away from the first bent portion 3222 is connected with the inner edge of the folded ring portion 321, and the first bent portion 3222 is connected with the inner edge of the diaphragm 34, so as to realize the connection of the inner edge of the diaphragm 34 and the side edge of the second diaphragm assembly 32, and form the sound generating cavity 4 by the diaphragm 34, the second vibration plate 322 of the second diaphragm assembly 32, the folded ring portion 321 and the shell 1. It can be understood that the second vibration plate 322 of the second diaphragm assembly 32 is connected with the voice coil 33 through the rigid connecting piece 35. When the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting piece 35, the second vibration plate 322 of the second diaphragm assembly 32 drives the diaphragm 34 to vibrate and deform.

[0105] Alternatively, the folded ring portion 321 of the second diaphragm assembly 32 and the second vibration plate 322 are connected by bonding or integrally injection molding, which is not limited herein. In the embodiment, the main body portion 3221 and the first bent portion 3222 of the second vibration plate 322 are integrally formed, and the first bent portion 3222 is formed by bending and extending the main body portion 3221 towards the diaphragm 34, for example, by injection molding or stamping forming, which is not limited herein.

[0106] In an embodiment, an inclined portion 3223 is formed at the connection between the main body portion 3221 and the first bent portion 3222, and the inclined portion 3223 is arranged at an angle with the vibration direction of the vibration system 3.

[0107] It can be understood that, as shown in Figures 3 to 5 , Figure 14As shown, the plane where the inclined portion 3223 is located is arranged at an angle with the vibration direction of the vibration system 3, which is optionally greater than 0° and less than 90°. The arrangement of the inclined portion 3223 can improve the rigidity of the second vibration 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 the feasibility of molding. At the same time, the inclined portion 3223 is farther away from the magnetic circuit system 2 relative to the inner edge of the second vibration plate 322, which can make the outer edge of the magnetic circuit system 2 outwardly inclined and expanded, thereby increasing the size of the magnetic circuit system 2 and further improving the BL of the sound production device 100; and the inclined portion 3223 is more convenient for positioning and connecting the second vibration plate 322 and the folded ring portion 321, thereby improving the connection precision. Optionally, the second vibration plate 322 can be a magnesium-aluminum alloy, a magnesium-lithium alloy, etc., which is not limited herein.

[0108] In an embodiment, the diaphragm 34 is a flexible member, which includes an outer connecting portion 341, a deformation portion 342, and an inner connecting portion 343 connected in sequence, the outer periphery of the outer connecting portion 341 is connected with the first shell 11, and the inner edge of the inner connecting portion 343 is connected with the first folded portion 3222, and the deformation portion 342 is in a folded shape.

[0109] In the present embodiment, as shown in Figures 3 to 5 , Figure 13 By setting the diaphragm 34 as a flexible member, when the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting member 35, the second vibration plate 322 of the second diaphragm assembly 32 drives the diaphragm 34 to vibrate and deform, so that the volume between the diaphragm 34 and the second diaphragm assembly 32 changes relatively to facilitate the smooth flow of air in the sound production cavity 4 through the sound hole 111, thereby increasing the effective vibration area of the sound production device 100 when vibrating, and improving the performance of the sound production device 100.

[0110] It can be understood that by setting the diaphragm 34 as the outer connecting portion 341, the deformation portion 342, and the inner connecting portion 343, the outer periphery of the outer connecting portion 341 is connected with the outer shell 1, and the inner edge of the inner connecting portion 343 is connected with the first folded portion 3222, so that the diaphragm 34 can be connected and fixed with the outer shell 1 through the outer connecting portion 341, and can be connected with the inner edge of the second diaphragm assembly 32 through the inner connecting portion 343, so that the sealed sound production cavity 4 is formed between the diaphragm 34 and the second diaphragm assembly 32, and the deformation portion 342 is arranged in a folded shape, thereby improving the deformation ability of the diaphragm 34, so that when the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting member 35, the second vibration plate 322 of the second diaphragm assembly 32 drives the diaphragm 34 to vibrate and deform.

[0111] In an embodiment, the inner edge of the inner connecting portion 343 is bent and extends towards the first bending portion 3222 to form a second flange 3431 connected with the first bending portion 3222.

[0112] In the present embodiment, as shown in Figures 3 to 5 、 Figure 13 , by providing the second flange 3431 on the inner edge of the inner connecting portion 343, the second flange 3431 is further connected with the first bending portion 3222, which not only improves the connection stability, but also further improves the waterproof sealing performance. Alternatively, the second flange 3431 is formed by bending and extending the inner edge of the inner connecting portion 343 towards the first bending portion 3222.

[0113] Alternatively, the outer connecting portion 341, the deformation portion 342, the inner connecting portion 343 and the second flange 3431 of the diaphragm 34 are integrally formed, for example, integrally injection molded or integrally stamped, which is not limited herein.

[0114] In the present embodiment, the compliance of the diaphragm 34 is optionally greater than the compliance of the folding ring portion 321. It can be understood that in this way, when the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting piece 35, the diaphragm 34 only plays a role of isolation and sealing, and does not generate a reverse force on the vibration of the second diaphragm assembly 32, thereby improving the low frequency sensitivity of the loudspeaker.

[0115] It can be understood that the compliance of the diaphragm 34 is optionally greater than the compliance of the inner folding ring 311 of the first diaphragm assembly 31, and the compliance of the diaphragm 34 is optionally greater than the compliance of the outer folding ring 313 of the first diaphragm assembly 31. In this way, the diaphragm 34 only plays a role of sealing, and does not generate a reverse force on the vibration of the first diaphragm assembly 31 and the second diaphragm assembly 32, thereby improving the low frequency sensitivity.

[0116] Alternatively, the deformation portion 342 is protruded towards the direction away from the first diaphragm assembly 31, the folding ring portion 321 is protruded towards the direction close to the first diaphragm assembly 31, and the deformation portion 342 and the folding ring portion 321 are disposed in a staggered manner in the direction perpendicular to the vibration system 3. It can be understood that in this way, the folding ring portion 321 of the second diaphragm assembly 32 avoids interference with the deformation portion 342 of the diaphragm 34 during vibration. Of course, in other embodiments, the folding ring portion 321 can also be protruded towards the direction away from the first diaphragm assembly 31, which is not limited herein.

[0117] In an embodiment, in the vibration direction of the vibration system 3, the projection width L1 of the deformation portion 342 is greater than or equal to the projection width L2 of the folding ring portion 321, and the ratio of L1 to L2 is 1:1-3:1.

[0118] In the present embodiment, as shown in Figure 4As shown, along the vibration direction of the vibration system 3, by setting the projection width L1 of the deformed part 342 of the diaphragm 34 to be greater than or equal to the projection width L2 of the folded ring part 321 of the second diaphragm assembly 32, the effective vibration area Sd2 of the second diaphragm assembly 32 can be effectively ensured to be greater than the effective vibration area Sd1 of the diaphragm 34, so that when the voice coil 33 drives the second diaphragm assembly 32 and the diaphragm 34 to vibrate, the diaphragm 34 has a negative effect on the air volume, and the second diaphragm assembly 32 has a positive effect on the air volume, and the sound cavity 4 is used to increase the working air volume, thereby increasing the effective vibration area of the product.

[0119] Optionally, the ratio of L1 to L2 is 1:1, 1.5:1, 2:1, 2.5:1, 3:1, etc., which is not limited herein.

[0120] In an embodiment, the edge magnetic part 23 includes a plurality of, and the second vibration plate 322 has a first extension part 3224 extending to the avoidance space 233, and the diaphragm 34 has a second extension part 344 extending to the avoidance space 233, and the second extension part 344 is correspondingly connected with the first extension part 3224.

[0121] In the embodiment, as shown in Figure 3 、 Figures 7 to 9 、 Figure 15 As shown, by setting the edge magnetic part 23 to be a plurality of, the plurality of edge magnetic parts 23 are arranged around and spaced apart from the outside of the center magnetic part 22, so that the avoidance space 233 is formed between the adjacent two edge magnetic parts 23, thereby providing the avoidance and movement space for the rigid connecting piece 35 by using the avoidance space 233, that is, the rigid connecting piece 35 is arranged in the avoidance space 233, so that one end of the rigid connecting piece 35 is connected with the second diaphragm assembly 32, and the other end of the rigid connecting piece 35 is connected with the voice coil 33, so that the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting piece 35.

[0122] It can be understood that by arranging the first extension part 3224 on the second diaphragm assembly 32, the first extension part 3224 extends towards the avoidance space 233 and is connected with the rigid connecting piece 35, so that the connection stability of the second diaphragm assembly 32 and the rigid connecting piece 35 can be increased, so as to ensure that the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting piece 35. Optionally, the first extension part 3224 is formed by the second vibration plate 322 extending towards the avoidance space 233.

[0123] In the embodiment, as shown in Figure 13As shown, the diaphragm 34 has a second extension 344 extending to the avoiding space 233, and the second extension 344 is connected to the first extension 3224 correspondingly, so as to further increase the connection stability and sealing of the diaphragm 34 and the second vibrating plate 322. It can be understood that, as Figure 13 As shown, the inner connecting part 343 and the second flange 3431 of the diaphragm 34 both extend into the avoiding space 233 and form the second extension 344, which is not limited here.

[0124] In another embodiment, the side magnetic part 23 includes a plurality of, the avoiding space 233 is formed between two adjacent side magnetic parts 23, the voice coil 33 has a first protrusion 331 extending to the avoiding space 233, the center magnetic part 22 has a second protrusion 224 extending to the avoiding space 233, and the first protrusion 331 is arranged opposite to the second protrusion 224.

[0125] In the present embodiment, as shown, Figure 10 As shown, a plurality of side magnetic parts 23 are arranged around and spaced apart from the outside of the center magnetic part 22, so that the avoiding space 233 is formed between two adjacent side magnetic parts 23. By arranging the first protrusion 331 on the voice coil 33, the first protrusion 331 extends to the avoiding space 233. By arranging the second protrusion 224 on the center magnetic part 22, the second protrusion 224 extends to the avoiding space 233 and is spaced apart from and corresponds to the first protrusion 331. Such arrangement on the one hand increases the length of the wire of the voice coil 33, thereby facilitating the rigid connecting piece 35 to connect the voice coil 33 and the second diaphragm assembly 32, and on the other hand increases the magnet volume of the center magnetic part 22, thereby effectively improving the magnetic field strength and further improving the BL value of the sound generating device 100.

[0126] It can be understood that the center magnetic part 22 can be rectangular in structure, the voice coil 33 can be rectangular, the avoiding space 233 of the side magnetic part 23 is arranged corresponding to the corner position of the center magnetic part 22, the four corner positions of the voice coil 33 are respectively provided with the first protrusion 331, and the four corner positions of the center magnetic part 22 are respectively provided with the second protrusion 224, which is not limited here.

[0127] In an embodiment, the vibration system 3 further includes a centering support 36, the centering support 36 includes an outer fixed part 361, an inner fixed part 362, and a vibration arm 363 connecting the outer fixed part 361 and the inner fixed part 362, and the rigid connecting piece 35 is arranged on the inner fixed part 362; the second diaphragm assembly 32 includes a folded ring part 321 and a second vibrating plate 322 connected together, the outer periphery of the folded ring part 321 and the outer fixed part 361 are arranged between the first shell 11 and the second shell 12, and the inner edge of the second vibrating plate 322 is connected to the inner edge of the diaphragm 34; wherein the inner fixed part 362 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.

[0128] In the embodiment, as shown in Figures 3 to 12 , the setting of the centering branch 36 makes the voice coil 33 connect and conduct with the external circuit through the centering branch 36, and the centering branch 36 plays a role of centering the vibration of the voice coil 33 through the rigid connecting piece 35, avoiding the swing or polarization of the voice coil 33 in the vibration process.

[0129] In order to avoid the interference or influence of the setting of the centering branch 36 on the second diaphragm assembly 32, the folded ring part 321 of the second diaphragm assembly 32 is protruded towards the direction close to the first diaphragm assembly 31. It can be understood that the centering branch 36 can be one or multiple. When the centering branch 36 is multiple, the multiple centering branches 36 are distributed in the long axis direction and / or the short axis direction of the magnetic circuit system 2 and / or the corresponding positions of the four corners of the magnetic circuit system 2.

[0130] It can be understood that the multiple centering branches 36 can be symmetrically distributed in the long axis direction of the magnetic circuit system 2; the multiple centering branches 36 can also be symmetrically distributed in the short axis direction of the magnetic circuit system 2; the multiple centering branches 36 can also be set in the corresponding positions of the four corners of the magnetic circuit system 2. Of course, in other embodiments, the multiple centering branches 36 can be distributed in the long axis direction of the magnetic circuit system 2, the short axis direction of the magnetic circuit system 2 and the corresponding positions of the diagonal or four corners of the magnetic circuit system 2, which is not limited herein.

[0131] Optionally, the centering branch 36 includes two or four, so that the voice coil 33 can be connected and conducted with the external circuit by the centering branch 36, and the vibration balance of the sound generating device 100 can be ensured.

[0132] In an embodiment, the centering branch 36 includes an outer fixed part 361, an inner fixed part 362 and a vibration arm 363 connecting the outer fixed part 361 and the inner fixed part 362, the outer fixed part 361 is connected with the shell 1, and the rigid connecting piece 35 is arranged in the inner fixed part 362.

[0133] In the embodiment, as shown in Figure 3 , Figures 7 to 12 , the inner fixed part 362 is connected with the second vibration plate 322 of the second diaphragm assembly 32 and the voice coil 33, and is electrically connected with the lead wire of the voice coil 33. Optionally, the inner fixed part 362 is provided with an inner pad 3623, and the lead wire of the voice coil 33 is connected and conducted with the inner pad 3623. In this way, the lead wire connection of the voice coil 33 can be conveniently realized, and the connection and conduction with the external circuit can be smoothly realized.

[0134] Optionally, the rigid connecting piece 35 is arranged on the side of the inner fixing part 362 away from the second diaphragm assembly 32. It can be understood that in this way, the distance between the centering sheet 36 and the magnetic circuit system 2 is increased, only the local part of the magnetic circuit system 2 needs to be arranged to avoid the rigid connecting piece 35, and the height dimension of the sound production device 100 does not need to be additionally increased to meet the amplitude of the vibration system 3, which is beneficial to the thin type arrangement.

[0135] Optionally, as shown in Figure 3 , Figures 8 to 12 , the outer fixing part 361, the vibration arm 363 and the inner fixing part 362 of the centering sheet 36 can be integrally formed. In this way, the structural strength of the centering sheet 36 can be effectively guaranteed, and the processing steps of the centering sheet 36 are simplified. In order to ensure the deformation ability of the centering sheet 36, the vibration arm 363 has at least one bending.

[0136] In an embodiment, as shown in Figure 3 , Figures 8 to 12 , the outer fixing part 361 is arranged in a ring shape, the outer fixing part 361 has alternating short axis sides and long axis sides, the vibration arm 363 is led out from the side of the inner fixing part 362 corresponding to the short axis side and extends along the long axis side after being bent, and the vibration arm 363 is connected to the center region of the long axis side.

[0137] In the embodiment, as shown in Figure 3 , Figures 8 to 12 , the centering sheet 36 is one, at this time the outer fixing part 361 of the centering sheet 36 can be a rectangular ring structure, the vibration arm 363 includes at least two, and the inner fixing part 362 can be four. It can be understood that in this way, the length of the vibration arm 363 can be increased, the stress of the vibration arm 363 can be improved, and thus the reliability can be improved.

[0138] Optionally, the vibration arm 363 includes four, and the inner fixing part 362 includes four. Each inner fixing part 362 is connected to the outer fixing part 361 through a vibration arm 363. Optionally, the four vibration arms 363 and the four inner fixing parts 362 are respectively arranged at the four corner positions of the rectangular ring outer fixing part 361. In the embodiment, the four inner fixing parts 362 are respectively arranged at the avoiding spaces 233 of the side magnetic part 23, and at least part of the inner fixing part 362 extends into the magnetic gap 24 through the avoiding space 233 and is connected to the voice coil 33, which is not limited herein.

[0139] It can be understood that, as shown in Figure 3 , Figure 7 , the outer fixing part 361, the vibration arm 363 and the inner fixing part 362 of the centering sheet 36 can be located in the same plane. Of course, in other embodiments, the outer fixing part 361 and the inner fixing part 362 of the centering sheet 36 can also be located in different planes, which is not limited herein.

[0140] In the embodiment, as shown in Figure 8 , Figures 1 to 3 and Figure 5 , the voice coil 33 is optionally in the shape of a rectangular ring, and the four inner fixing portions 362 of the centering bracket 36 are respectively arranged at the four corner positions of the voice coil 33, which are not limited herein. It can be understood that the outer fixing portion 361 of the centering bracket 36 is adhesively connected with the shell 1, and the inner fixing portion 362 and the rigid connecting piece 35 can be adhesively connected, welded, or integrally formed, which are not limited herein. In this way, the length of the vibration arm 363 of the centering bracket 36 can be increased by using the length of the product, so that the reliability is better when working at a large amplitude; at the same time, the centering bracket 36 provides constraint to the vibration system 3, which can better inhibit the performance deterioration caused by product deflection at a large amplitude.

[0141] In order to better connect with the external circuit, in an embodiment, as shown in Figure 6 , Figures 8 to 12 , Figure 2 , Figure 3 , the centering bracket 36 further includes a conductive portion 364, one end of the conductive portion 364 is connected with the outer fixing portion 361, the other end of the conductive portion 364 extends towards the direction away from the shell 1, and is provided with an external pad 365. In this way, the external pad 365 can be guided to the outside of the shell 1 through the conductive portion 364, so as to facilitate the connection and conduction of the external circuit and the centering bracket 36, and ensure that the current is introduced into the voice coil 33.

[0142] In an embodiment, the magnetic yoke 21 is provided with a avoiding structure 211 corresponding to the inner fixing portion 362. It can be understood that, as shown in Figure 9 , Figure 3 and Figures 8 to 12 , by providing the avoiding structure 211 on the magnetic yoke 21, the avoiding structure 211 can provide avoiding for the centering bracket 36 during the vibration of the second diaphragm assembly 32, so as to ensure that the inner fixing portion 362 or the rigid connecting piece 35 of the centering bracket 36 does not touch the magnetic yoke 21.

[0143] Optionally, the avoiding structure 211 is a recessed groove or a through hole. It can be understood that the avoiding structure 211 is a recessed groove, that is, the side of the magnetic yoke 21 facing the centering bracket 36 is recessed to form a groove structure in the direction away from the centering bracket 36. The avoiding structure 211 is a through hole, that is, the through hole penetrates the magnetic yoke 21; at the same time, the avoiding structure 211 can also be used as an air vent of the sound generating device 100, so as to ensure that the air flow of the vibration cavity of the sound generating device 100 and the external air flow are communicated during the vibration of the first diaphragm assembly 31, thereby ensuring the balance of the internal and external air pressure.

[0144] In the embodiment, the rigid connecting piece 35 is arranged on the side of the inner fixing part 362 away from the second diaphragm assembly 32, and the magnetic yoke 21 is provided with a avoiding structure 211 corresponding to the rigid connecting piece 35. Optionally, the avoiding structure 211 is a recessed groove or a through hole.

[0145] In an embodiment, the inner fixing part 362 includes a body part 3621 and a third extending part 3622 extending from the body part 3621 towards the voice coil 33, the body part 3621 is connected with the second vibrating plate 322, and the third extending part 3622 is connected with the voice coil 33; wherein the third extending part 3622 or the body part 3621 is provided with an inner pad 3623 electrically connected with the lead wire of the voice coil 33.

[0146] In the embodiment, as shown in Figure 3 , Figures 8 to 12 , the inner fixing part 362 of the centering support sheet 36 is arranged as the body part 3621 and the third extending part 3622, so that the third extending part 3622 extends towards the voice coil 33. In this way, while the body part 3621 of the inner fixing part 362 of the centering support sheet 36 is connected with the second vibrating plate 322 of the second diaphragm assembly 32, the inner fixing part 362 of the centering support sheet 36 is connected with the voice coil 33 through the third extending part 3622, thereby further ensuring that the voice coil 33 drives the second diaphragm assembly 32 to vibrate during vibration.

[0147] It can be understood that by providing the inner pad 3623 on the third extending part 3622 or the body part 3621, the inner pad 3623 can be conveniently electrically connected with the lead wire of the voice coil 33, thereby ensuring that the voice coil 33 is connected with the external circuit through the centering support sheet 36.

[0148] In an embodiment, the rigid connecting piece 35 includes a rigid connecting part 351 and a fourth extending part 352 extending from the rigid connecting part 351 towards the voice coil 33, the rigid connecting part 351 is connected with the body part 3621, and the fourth extending part 352 is connected with the third extending part 3622.

[0149] In the embodiment, as shown in Figures 3 to 12 , Figure 6 , the rigid connecting piece 35 is arranged as the rigid connecting part 351 and the fourth extending part 352, so that the rigid connecting piece 35 is connected with the inner fixing part 362 of the centering support sheet 36 through the rigid connecting part 351, and is connected with the voice coil 33 through the fourth extending part 352, thereby ensuring the connection strength of the rigid connecting piece 35 connecting the voice coil 33 and the second diaphragm assembly 32, and further ensuring that the voice coil 33 drives the second diaphragm assembly 32 to vibrate during vibration.

[0150] In an embodiment, as shown in Figure 6As shown, the outer fixing part 361 is clamped between the second shell 12 and the outer periphery of the second diaphragm assembly 32, the rigid connecting part 35 is arranged on the inner fixing part 362, the inner fixing part 362 is connected with the voice coil 33 and electrically connected with the lead wire of the voice coil 33.

[0151] In the embodiment, the shell 1 can be a plastic shell or a metal shell, that is, the first shell 11 and the second shell 12 can both be plastic shells or metal shells. Of course, in other embodiments, one of the first shell 11 and the second shell 12 of the shell 1 is a plastic shell and the other is a metal shell, etc., which is not limited herein.

[0152] Optionally, the second shell 12 of the shell 1 and the magnetic yoke 21 are an integral molding structure. It can be understood that when the second shell 12 is a plastic shell, the second shell 12 and the magnetic yoke 21 are integrally injection molded; when the second shell 12 is a metal shell, the second shell 12 and the magnetic yoke 21 are an integral molding structure, which is not limited herein.

[0153] In an embodiment, the first shell 11 can be a metal shell and the second shell 12 can be a metal shell.

[0154] In order to further improve the connection stability of the first shell 11 and the second shell 12 or the magnetic yoke 21, in an embodiment, as shown in Figures 3 to 5 the first shell 11 is provided with a welding part 121 extending towards the magnetic yoke 21, and the welding part 121 is welded and connected with the magnetic yoke 21 or the second shell 12. In another embodiment, as shown in Figure 4 the magnetic yoke 21 or the second shell 12 is provided with a welding part 121 extending towards the first shell 11, and the welding part 121 is welded and connected with the outer wall of the first shell 11.

[0155] Of course, in yet another embodiment, the sound generating device 100 further comprises a metal welding sheet, one end of the metal welding sheet is welded and connected with the magnetic yoke 21 or the second shell 12, and the other end of the metal welding sheet is welded and connected with the outer wall of the first shell 11. It can be understood that in this way, the connection stability of the first shell 11 and the second shell 12 or the magnetic yoke 21 can be further improved through the metal welding sheet.

[0156] In an embodiment, the first shell 11 has a side wall 112 and an inner bending part 113 formed by bending and extending from one end of the side wall 112 away from the second shell 12 towards the inside, the outer bending ring 313 and the outer periphery of the diaphragm 34 are connected to the inner bending part 113, and the outer periphery of the second diaphragm assembly 32 is clamped between one end of the side wall 112 away from the inner bending part 113 and the second shell 12; wherein the sound hole 111 is arranged on the side wall 112 or the inner bending part 113.

[0157] In the embodiment, as shown in Figure 5As shown, by setting the first shell 11 as the side wall 112 and the inner bending part 113 arranged at an angle, the inner bending part 113 of the first shell 11 is used to mount and fix the first diaphragm assembly 31 and the membrane 34, and the side wall 112 of the first shell 11 is used to clamp and fix the outer periphery of the second diaphragm assembly 32 and the centering support 36, i.e., the outer periphery of the folded ring part 321 of the second diaphragm assembly 32 and the outer fixing part 361 of the centering support 36, between the end of the side wall 112 away from the inner bending part 113 and the second shell 12.

[0158] As can be understood, the outer fixing part 361 of the centering support 36 is located between the outer periphery of the folded ring part 321 of the second diaphragm assembly 32 and the second shell 12, and the other end of the second shell 12 is connected to the magnetic yoke 21. In the embodiment, the inner bending part 113 of the first shell 11 is formed by bending and extending inward from the end of the side wall 112 away from the second shell 12, i.e., the inner bending part 113 and the side wall 112 of the first shell 11 are integrally formed, which can ensure the structural strength of the first shell 11, which is not limited herein.

[0159] In order to further increase the contact area of the first diaphragm assembly 31 with the first shell 11, improve the connection stability and waterproof sealing, the outer periphery of the outer folded 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 of the first shell 11, i.e., the outer wall surface of the side wall 112.

[0160] In the embodiment, the outer folded ring 313 of the first diaphragm assembly 31 is fixed to the inner bending part 113 of the first shell 11, so that the first diaphragm assembly 31 is adhesively fixed at the maximum outer shape of the outer shell 1, which can increase the effective vibration area of the product by increasing the product outer shape size. Meanwhile, the magnetic yoke 21 of the magnetic circuit system 2 is fixed to the second shell 12, and the outer periphery of the second diaphragm assembly 32 is clamped between the first shell 11 and the second shell 12, so that the height of the outer shell 1 can be adjusted accordingly to increase or decrease according to the requirements of the product amplitude, so that the sound emitting cavity 4 between the membrane 34 and the second diaphragm assembly 32 can adapt to the needs of different products.

[0161] Optionally, the sound outlet hole 111 is arranged on the side wall 112 or the inner bending part 113, which is not limited herein.

[0162] In an embodiment, as shown in Figure 4 and Figure 5 the inner bending part 113 includes an upper surface, a lower surface and an inner side surface, the upper surface and the lower surface are arranged away from each other, and the inner side surface connects the upper surface and the lower surface and is located at the end of the inner bending part 113 away from the side wall 112.

[0163] In the embodiment, as shown in Figures 3 to 5and Figure 9 As shown in FIG. 1, 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. In this way, the fixing of the first diaphragm assembly 31 and the diaphragm 34 can be achieved, and the distance between the first diaphragm assembly 31 and the diaphragm 34 can be ensured, thereby avoiding interference and other problems during vibration.

[0164] Of course, in other embodiments, the outer periphery of the outer folded 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 side surface; or, the outer periphery of the outer folded ring 313 is connected to the upper surface, and the outer periphery of the diaphragm 34 is clamped between the outer periphery of the outer folded ring 313 and the upper surface; or, the outer periphery of the outer folded ring 313 is connected to the inner side surface, and the outer periphery of the diaphragm 34 is connected to the lower surface; or, the outer periphery of the outer folded ring 313 and the diaphragm 34 are both connected to the inner side surface, which is not limited here.

[0165] It can be understood that the outer connecting portion 341 of the diaphragm 34 can be connected to the lower surface, the inner side surface, or the upper surface of the inner folded portion 113, which is not limited here. In the present embodiment, when the outer connecting portion 341 of the diaphragm 34 and the outer periphery of the outer folded ring 313 are both connected to the upper surface of the inner folded portion 113, the outer connecting portion 341 of the diaphragm 34 is located between the outer periphery of the outer folded ring 313 and the upper surface of the inner folded portion 113, which is not limited here.

[0166] In an embodiment, the center magnetic portion 22 includes a first center magnet 221, a center magnetic conducting plate 222, and a second center magnet 223 which are stacked, the first center magnet 221 is connected with the magnetic conducting yoke 21, and the inner side of the inner folded ring 311 is connected with the second center magnet 223.

[0167] In the present embodiment, as shown in FIG. 1, the center magnetic portion 22 is arranged as a magnetic structure, so that the first center magnet 221, the center magnetic conducting plate 222, and the second center magnet 223 are sequentially stacked in the vertical direction on the magnetic conducting yoke 21. Figures 3 to 5 , Figure 9 As shown in FIG. 1, the center magnetic portion 22 is arranged as a magnetic structure, so that the first center magnet 221, the center magnetic conducting plate 222, and the second center magnet 223 are sequentially stacked in the vertical direction on the magnetic conducting yoke 21. It can be understood that the first center magnet 221 and the second center magnet 223 are both magnetized along the vibration direction of the vibration system 3, and the magnetization direction of the first center magnet 221 is opposite to that of the second center magnet 223. In this way, by using the magnetic conducting effect of the center magnetic conducting plate 222, the magnetic induction lines of the first center magnet 221 and the second center magnet 223 are gathered in the center magnetic conducting plate 222, and are transmitted to the magnetic gap 24 by the center magnetic conducting plate 222, so that the center magnetic portion 22 generates a magnetic field with a strong magnetic field strength passing through the magnetic gap 24, thereby increasing the density of the magnetic flux of the magnetic gap 24, increasing the number of magnetic force lines passing through the voice coil 33, increasing the magnetic field force received by the voice coil 33, and effectively improving the BL value.

[0168] Optionally, the first central magnet 221 is an integral plate structure. In the embodiment, as shown in Figures 3 to 5 , Figure 9 by setting the first central magnet 221 as an integral plate structure, the processing of the first central magnet 221 is facilitated, and the assembly and magnetization are also facilitated, thereby effectively improving the production and assembly efficiency.

[0169] Of course, in other embodiments, the first central magnet 221 includes a plurality of first central magnets 221, the plurality of first central magnets 221 are adjacent and laid flat between the central magnetic conductive plate 222 and the magnetic yoke 21, the plurality of first central magnets 221 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the plurality of first central magnets 221 are the same. Optionally, the magnetic poles of the plurality of first central magnets 221 close to the central magnetic conductive plate 222 are the same.

[0170] Optionally, the central magnetic conductive plate 222 of the central magnetic portion 22 can be an integral square plate structure and is located between the first central magnet 221 and the second central magnet 223; or, the central magnetic conductive plate 222 includes a plurality of central magnetic conductive plates 222, the plurality of central magnetic conductive plates 222 are adjacent and arranged in parallel between the first central magnet 221 and the second central magnet 223, so that the plurality of central magnetic conductive plates 222 cooperatively form a square plate structure, which is not limited herein.

[0171] Optionally, the second central magnet 223 is an integral plate structure. In the embodiment, as shown in Figure 4 , Figure 5 by setting the second central magnet 223 as an integral plate structure, the processing of the second central magnet 223 is facilitated, and the assembly and magnetization are also facilitated, thereby effectively improving the production and assembly efficiency.

[0172] Of course, in other embodiments, the second central magnet 223 includes a plurality of second central magnets 223, the plurality of second central magnets 223 are adjacent and laid flat on the side of the central magnetic conductive plate 222 away from the first central magnet 221, the plurality of second central magnets 223 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the plurality of second central magnets 223 are the same. Optionally, the magnetic poles of the plurality of second central magnets 223 close to the central magnetic conductive plate 222 are the same.

[0173] In the embodiment, the inner side of the inner folding ring 311 of the first diaphragm assembly 31 is connected with the second central magnet 223. In order to avoid the interference of the second central magnet 223 to the inner folding ring 311 when the inner folding ring 311 vibrates, in an embodiment, as shown in Figures 3 to 5 and Figure 9 the edge of the second central magnet 223 is provided with a relief structure.

[0174] 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.

[0175] Optionally, the avoidance structure can be at least one of the following: inclined slope, rounded corner, chamfer, and stepped structure.

[0176] 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.

[0177] 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.

[0178] Understandable, such as Figure 16 , Figure 17 As shown, 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, which is not limited here.

[0179] In the embodiment, the plurality of side magnetic portions 23 are arranged around the outside of the central magnetic portion 22 and are spaced from the central magnetic portion 22 to form the magnetic gap 24. At this time, the adjacent side magnetic portions 23 are spaced to form the avoidance space 233, so that the avoidance space 233 provides the mounting avoidance space and the movement space for the rigid connecting piece 35 and the inner fixing portion 362 of the centering support piece. Alternatively, the plurality of side magnetic portions 231 and the plurality of side magnetic conductive plates 232 are arranged one by one.

[0180] As shown in ​ and ​ The utility model also proposes a sound production module 600, the sound production module 600 includes the sound production device 100, the specific structure of the sound production device 100 refers to the foregoing embodiment, because the sound production module 600 adopts all the technical schemes of the foregoing all embodiments, so at least has all the beneficial effects brought by the technical scheme of the foregoing embodiment, here will not be repeated.

[0181] In an embodiment, the sound production module 600 further includes a module housing 500, the module housing 500 is provided with a mounting cavity 510 and a sound outlet 520 communicating with the mounting cavity 510, the sound production device 100 is arranged in the mounting cavity 510, and a front sound cavity 530 is formed between the first diaphragm assembly 31 of the sound production device 100 and the module housing 500, and the front sound cavity 530 communicates with the sound outlet 520; wherein the sound production cavity 4 of the sound production device 100 communicates with the sound outlet 520 through the front sound cavity 530; or the module housing 500 is further provided with a sound outlet channel, and the sound production cavity 4 of the sound production device 100 communicates with the sound outlet 520 through the sound outlet channel; or the sound hole 111 of the sound production device 100 communicates with the sound outlet 520 in a direct communication mode.

[0182] In the embodiment, the sound production module 600 can be a direct sound production structure or a side sound production structure. When the sound production module 600 is a direct sound production structure, the sound outlet 520 of the module housing 500 is arranged in a direct communication mode with the first diaphragm assembly 31 of the sound production device 100. It can be understood that the sound hole 111 on the shell 1 of the sound production device 100 is arranged on the inner bending portion 113 of the first shell 11, and the sound hole 111 is arranged in a direct communication mode with the sound outlet 520 of the module housing 500, at this time, the sound hole 111 communicates with the front sound cavity 530; or the sound hole 111 communicates with the sound outlet 520 through the sound outlet channel of the module housing 500, which is not limited herein.

[0183] Of course, the sound hole 111 on the shell 1 can also be arranged on the side wall 112 of the first shell 11, and the sound hole 111 communicates with the sound outlet 520 through the sound outlet channel of the module housing 500, which is not limited herein.

[0184] It can be understood that when the sound production module 600 is a side sound production structure, the sound outlet 520 of the module shell 500 is located at one side of the first diaphragm assembly 31 of the sound production device 100. It can be understood that the sound hole 111 on the shell 1 of the sound production device 100 is arranged on the inner bending part 113 of the first shell 11, and at this time, the sound hole 111 can be communicated with the sound outlet 520 through the sound outlet channel of the module shell 500, which is not limited here.

[0185] Of course, the sound hole 111 on the shell 1 can also be arranged on the side wall 112 of the first shell 11, and at this time, the sound hole 111 is communicated with the sound outlet 520 of the module shell 500 through the sound outlet channel of the module shell 500; or, the sound hole 111 and the sound outlet 520 of the module shell 500 are arranged in a normal communication mode, which is not limited here.

[0186] In an embodiment, the sound production module 600 further comprises a flexible circuit board, one end of the flexible circuit board is electrically connected with the centering support sheet 36 of the sound production device 100, and the other end of the flexible circuit board is used for connecting an external power supply.

[0187] It can be understood that the flexible circuit board is used for connecting and conducting the external circuit and the sound production device 100. The flexible circuit board is provided with an inner pad and an outer pad, the inner pad of the flexible circuit board is connected and conducted with the outer pad 365 of the centering support sheet 36 of the sound production device 100, and the outer pad of the flexible circuit board is used for connecting with an external terminal.

[0188] In the embodiment, the module shell 500 has a mounting cavity 510, the sound production device 100 is arranged in the mounting cavity 510 of the module shell 500, and at least one end of the flexible circuit board connected with the sound production device 100 is located in the mounting cavity 510 of the module shell 500. Of course, in other embodiments, the flexible circuit board can also be arranged in the mounting cavity 510 of the module shell 500, which is not limited here.

[0189] The utility model also proposes an electronic equipment, the electronic equipment includes above-mentioned sound production device 100. The specific structure of the sound production device 100 refers to the preceding embodiment, because the present electronic equipment adopts all the technical schemes of the preceding all embodiments, at least has all the beneficial effects brought by the technical scheme of the preceding embodiment, which will not be repeated here.

[0190] In the embodiment, the electronic equipment further comprises a device shell, and the sound production device 100 and the flexible circuit board are arranged in the device shell. It can be understood that the electronic equipment can be earphones, mobile phones, smart wearable devices, etc., which are not limited here.

[0191] The utility model discloses still propose a kind of electronic equipment, and the electronic equipment includes the sound production module 600 described above.This sound production module 600 specific structure refers to the foregoing embodiment, since the present electronic equipment has adopted the entire technical solution of all foregoing embodiments, therefore at least have the all beneficial effects brought by the technical solution of foregoing embodiment, here no longer repeat.

[0192] It can be understood that the electronic device can be a headset, a mobile phone, a smart wearable device, etc., which is not limited herein. In the present embodiment, the electronic device further includes a device housing, and the sound production module 600 is arranged in the device housing.

[0193] The above is only an optional embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and drawings content, or directly / indirectly applied in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A sound producing device, characterized by, The sound generating device comprises: a housing provided with a sound hole; a magnetic circuit system connected to the housing, the magnetic circuit system comprising a magnetic yoke, a central magnetic part and a side magnetic part provided on the magnetic yoke, the side magnetic part being located outside the central magnetic part and forming a magnetic gap with the central magnetic part, the central magnetic part comprising a first central magnet, a central magnetic plate and a second central magnet arranged in layers, the first central magnet being connected to the magnetic yoke; and a vibration system comprising a first diaphragm assembly, a second diaphragm assembly, a voice coil, a diaphragm and a rigid connecting piece, the first diaphragm assembly comprising an inner folding ring, a first vibration plate and an outer folding ring connected in sequence, the inner side of the inner folding ring being connected to the second central magnet, the outer periphery of the outer folding ring being connected to the housing, one end of the voice coil being connected to the first diaphragm assembly, the other end of the voice coil being suspended in the magnetic gap, the diaphragm and the second diaphragm assembly being arranged in sequence on the side of the first diaphragm assembly facing the magnetic yoke and being located outside the voice coil, the diaphragm being a flexible member, the outer edges of the diaphragm and the second diaphragm assembly being connected to the housing, the inner edge of the diaphragm being connected to the inner edge of the second diaphragm assembly to form a sound generating cavity communicating with the sound hole between the diaphragm and the second diaphragm assembly, one end of the rigid connecting piece being connected to the second diaphragm assembly, the other end of the rigid connecting piece being connected to the voice coil, so that the voice coil drives the second diaphragm assembly to vibrate through the rigid connecting piece; wherein the first central magnet and the second central magnet are magnetized along the vibration direction of the vibration system and in opposite directions, the housing comprises a first shell and a second shell, the first shell is provided with the sound hole, the outer periphery of the outer folding ring and the outer periphery of the diaphragm are connected to the first shell, the magnetic yoke is connected to the second shell, and the outer periphery of the second diaphragm assembly is clamped between the first shell and the second shell.

2. The sound production device of claim 1, wherein The first shell has a side wall and an inner folding part formed by bending and extending the end of the side wall away from the second shell towards the inside, the outer periphery of the outer folding ring and the diaphragm are connected to the inner folding part, and the outer periphery of the second diaphragm assembly is clamped between the end of the side wall away from the inner folding part and the second shell. The sound hole is provided on the side wall or the inner folding part.

3. The sound production device of claim 2, wherein The inner folding part comprises an upper surface, a lower surface and an inner side surface, the upper surface and the lower surface are arranged in opposite directions, the inner side surface connects the upper surface and the lower surface and is located at the end of the inner folding part away from the side wall. The outer periphery of the outer folding 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 folding ring is connected to the upper surface, and the outer periphery of the diaphragm is clamped between the outer periphery of the outer folding ring and the upper surface.

4. The sound production device of claim 1, wherein The first shell is a metal shell, and the second shell is a metal shell. The first shell is provided with a welding portion extending towards the magnetic yoke, and the welding portion is welded to the magnetic yoke or the second shell; and / or the magnetic yoke or the second shell is provided with a welding portion extending towards the first shell, and the welding portion is welded to the outer wall of the first shell; and / or the sound generating device further comprises a metal welding sheet, one end of the metal welding sheet is welded to the magnetic yoke or the second shell, and the other end of the metal welding sheet is welded to the outer wall of the first shell. The second shell and the magnetic yoke are formed in one piece.

5. The sound production device of claim 1, wherein The first vibrating plate extends to form a second bending portion towards the voice coil, and the second bending portion is connected to the voice coil; or the first diaphragm assembly further comprises a support, and two ends of the support are respectively connected to the first vibrating plate and the voice coil. The outer periphery of the outer folding ring extends to form a third flange, and the third flange is connected to the outer wall of the first shell.

6. The sound production device of claim 1, wherein The second diaphragm assembly comprises a folding ring portion and a second vibrating plate, the outer periphery of the folding ring portion is clamped between the first shell and the second shell, the second vibrating plate comprises a main body portion connected to the inner edge of the folding ring portion and a first bending portion formed by bending the main body portion towards the diaphragm, and the first bending portion is connected to the inner edge of the diaphragm.

7. The sound production device of claim 6, wherein The effective vibration area Sd1 of the diaphragm is smaller than the effective vibration area Sd2 of the second diaphragm assembly, and the ratio of Sd1 to Sd2 is 1:1.5-1:

3. An inclined portion is formed at the connection between the main body portion and the first bending portion, and the inclined portion is arranged at an angle with the vibration direction of the vibration system. The outer periphery of the folding ring portion is bent to form a first flange, and the first flange is connected to the outer wall of the first shell or the second shell.

8. The sound production device of claim 6, wherein, The diaphragm comprises an outer connecting portion, a deformation portion and an inner connecting portion connected in sequence, the outer periphery of the outer connecting portion is connected to the first shell, the inner edge of the inner connecting portion is connected to the first bending portion, and the deformation portion is in a bent shape.

9. The sound production device of claim 8, wherein, The inner edge of the inner connecting portion extends to form a second flange towards the first bending portion, and the second flange is connected to the first bending portion. In the vibration direction of the vibration system, the projection width L1 of the deformation portion is greater than or equal to the projection width L2 of the folding ring portion, and the ratio of L1 to L2 is 1:1-3:

1. The deformation portion protrudes towards the direction away from the first diaphragm assembly, the folding ring portion protrudes towards the direction close to the first diaphragm assembly, and the deformation portion and the folding ring portion are arranged in a staggered manner in the direction perpendicular to the vibration system. Both the inner folding ring and the outer folding ring protrude towards the direction away from the magnetic circuit system. The compliance of the diaphragm is greater than the compliance of the folding ring portion.

10. The sound production device of claim 1, wherein, The vibration system further comprises a centering sheet, the centering sheet comprises an outer fixed portion, an inner fixed portion and a vibration arm connecting the outer fixed portion and the inner fixed portion, and the rigid connecting piece is arranged in the inner fixed portion. The second diaphragm assembly comprises a connected folded ring portion and a second vibrating plate, an outer periphery of the folded ring portion and the outer fixed portion are clamped between the first shell and the second shell, and an inner edge of the second vibrating plate is connected with an inner edge of the diaphragm. The inner fixed portion is connected with the second vibrating plate and the voice coil, and is electrically connected with a lead wire of the voice coil.

11. The sound production device of any one of claims 1 to 10, wherein, The edge magnetic portion comprises an edge magnet and an edge magnetic guide plate which are stacked, the edge magnet is connected with the magnetic guide yoke, the edge magnetic guide plate is arranged opposite to the center magnetic guide plate, and a magnetization direction of the edge magnet is opposite to a magnetization direction of the first center magnet. And / or, the magnetic guide yoke is provided with a avoiding structure corresponding to the rigid connecting piece, and the avoiding structure is a recessed groove or a through hole.

12. A sound production module, comprising: The sound production module comprises: a module shell provided with a mounting cavity and a sound outlet communicating with the mounting cavity; and The sound production device according to any one of claims 1 to 11 is arranged in the mounting cavity, a front sound cavity is formed between the first diaphragm assembly of the sound production device and the module shell, and the front sound cavity communicates with the sound outlet; The sound production cavity of the sound production device communicates with the sound outlet through the front sound cavity; or the module shell is further provided with a sound outlet channel, the sound production cavity of the sound production device communicates with the sound outlet through the sound outlet channel; or the sound outlet hole of the sound production device communicates with the sound outlet directly.

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