Sound production device, sound production module and electronic equipment

Abstract

The utility model discloses a sounding device, a sounding module and an electronic device, and relates to the technical field of electroacoustic transduction, a central magnetic part of a magnetic circuit system of the sounding device comprises a first central magnet, a central magnetic conductive plate and a second central magnet which are stacked, and the inner side of an inner folding ring of a first diaphragm assembly of a vibration system is connected with the central magnetic part. The outer periphery of the outer folding ring is connected with the shell, the diaphragm and the second diaphragm assembly are sequentially arranged on the side, facing the magnetic conductive yoke, of the first diaphragm assembly, the outer edges of the diaphragm and the second diaphragm assembly are both connected with the shell, and the inner edge of the diaphragm is connected with the inner edge of the second diaphragm assembly. And the rigid connecting piece is connected with the second vibrating 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 vibrating diaphragm assembly to vibrate through the rigid connecting piece. 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 and electronic equipment of application of 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, sound production module and electronic equipment, which aims to provide a sound production device with increased effective vibration area. Compared with conventional loudspeakers, the sound production device increases the effective vibration area under the same amplitude conditions, 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 on 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 membrane 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 membrane 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 outer edges of the membrane and the second diaphragm assembly are connected with the shell, the inner edge of the membrane is connected with the inner edge of the second diaphragm assembly to form a sound cavity communicating with the sound hole between the membrane and the second diaphragm assembly, one end of the rigid connecting member is connected with the second diaphragm assembly, and 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] Wherein, 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.

[0010] In an embodiment, the second diaphragm assembly comprises a folding ring part and a second vibrating plate, the outer periphery of the folding ring part is connected with the shell, the second vibrating plate comprises a main body part connected with the inner edge of the folding ring part and a first bending part formed by bending and extending from the main body part towards the membrane, and the first bending part is connected with the inner edge of the membrane.

[0011] In an embodiment, an inclined part is formed at the connection between the main body part and the first bending part, and the inclined part is arranged at an angle with the vibration direction of the vibration system.

[0012] And / or, the outer periphery of the folding ring part is bent to form a first flange, and the first flange is connected with the outer wall of the shell.

[0013] In an embodiment, the edge magnetic part comprises a plurality of edge magnetic parts, and an avoidance space is formed between adjacent two edge magnetic parts, the second vibrating plate has a first extension part extending to the avoidance space, the membrane has a second extension part extending to the avoidance space, and the second extension part is connected with the first extension part in correspondence.

[0014] Alternatively, the edge magnetic part comprises a plurality of edge magnetic parts, and an avoidance space is formed between adjacent two edge magnetic parts, the voice coil has a first protruding part extending to the avoidance space, the center magnetic part has a second protruding part extending to the avoidance space, and the first protruding part is arranged opposite to the second protruding part.

[0015] In an embodiment, the diaphragm is a flexible member, the diaphragm comprises an outer connecting portion, a deformation portion and an inner connecting portion connected in sequence, an outer periphery of the outer connecting portion is connected with the outer shell, an inner edge of the inner connecting portion is connected with the first bending portion, and the deformation portion is in a bending shape.

[0016] In an embodiment, the inner edge of the inner connecting portion is bent and extends towards the first bending portion to form a second flange, and the second flange is connected with the first bending portion.

[0017] In an embodiment, in a vibration direction of the vibration system, a projection width L1 of the deformation portion is greater than or equal to a projection width L2 of the folding ring portion, and a ratio of L1 to L2 is 1:1-3:1.

[0018] In an embodiment, the deformation portion is convex towards a direction away from the first diaphragm assembly, the folding ring portion is convex towards a direction close to the first diaphragm assembly, and the deformation portion and the folding ring portion are arranged in a staggered manner in a direction perpendicular to the vibration system.

[0019] In an embodiment, the inner folding ring and the outer folding ring are both convex towards a direction away from the magnetic circuit system.

[0020] In an embodiment, a compliance of the diaphragm is greater than a compliance of the folding ring portion.

[0021] In an embodiment, an effective vibration area Sd1 of the diaphragm is less than an effective vibration area Sd2 of the second diaphragm assembly, and a ratio of Sd1 to Sd2 is 1:1.5-1:3.

[0022] In an embodiment, the first vibration plate is bent and extends towards the voice coil to form a second bending portion, and the second bending portion is connected with the voice coil; or the first diaphragm assembly further comprises a support, two ends of the support are respectively connected with the first vibration plate and the voice coil.

[0023] In an embodiment, an outer periphery of the outer folding ring is bent and extends to form a third flange, and the third flange is connected with an outer wall of the outer shell.

[0024] In an embodiment, the vibration system further comprises a centering support sheet, the centering support sheet comprises an outer fixed portion, an inner fixed portion and a vibration arm connecting the outer fixed portion and the inner fixed portion, the outer fixed portion is connected with the outer shell, and the rigid connecting member is arranged at the inner fixed portion.

[0025] The second diaphragm assembly comprises a folding ring portion and a second vibration plate connected in sequence, an outer periphery of the folding ring portion is connected with the outer shell, and an inner edge of the second vibration plate is connected with an inner edge of the diaphragm.

[0026] The inner fixing part is connected with the second vibrating plate and the voice coil, and is electrically connected with the lead wire of the voice coil.

[0027] In an embodiment, the inner fixing part comprises a body part and a third extending part extending from the body part towards the voice coil, the body part is connected with the second vibrating plate, and the third extending part is connected with the voice coil.

[0028] The third extending part or the body part is provided with an inner pad electrically connected with the lead wire of the voice coil.

[0029] In an embodiment, the magnet conducting yoke is provided with a avoiding structure corresponding to the inner fixing part, the avoiding structure is a recessed groove or a through hole.

[0030] The rigid connecting part is connected with the body part, and the fourth extending part is connected with the third extending part correspondingly.

[0031] The rigid connecting part is arranged on the side of the inner fixing part away from the second vibrating diaphragm.

[0032] The outer fixing part is arranged in a ring shape, and has alternating short axis sides and long axis sides, the vibrating arm is led out from the side of the inner fixing part corresponding to the short axis side, is bent, and then extends along the long axis side, and the vibrating arm is connected to the central region of the long axis side.

[0033] The centering supporting sheet further comprises a conductive part, one end of the conductive part is connected with the outer fixing part, the other end of the conductive part extends towards the direction away from the shell, and is provided with an external pad.

[0034] In an embodiment, 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 bending ring and the outer periphery of the diaphragm are connected with the first shell, the magnet conducting yoke is connected with the second shell, and the outer periphery of the second vibrating diaphragm assembly is clamped between the first shell and the second shell.

[0035] In an embodiment, the first shell has a side wall and an inner bending 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 bending ring and the diaphragm are connected to the inner bending part, and the outer periphery of the second vibrating diaphragm assembly is clamped between the end of the side wall away from the inner bending part and the second shell.

[0036] The sound hole is arranged on the side wall or the inner bending part.

[0037] In an embodiment, the inner bending 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 bending part away from the side wall;

[0038] The outer periphery of the outer bending 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 bending ring is connected to the upper surface, and the outer periphery of the diaphragm is clamped between the outer periphery of the outer bending ring and the upper surface.

[0039] In an embodiment, the first shell is a metal shell, and the second shell is a metal shell;

[0040] The first shell is provided with a welding part extending towards the magnetic yoke, and the welding part is welded to the magnetic yoke or the second shell; and / or the magnetic yoke or the second shell is provided with a welding part extending towards the first shell, and the welding part 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;

[0041] And / or the second shell and the magnetic yoke are integrally formed;

[0042] And / or 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, the outer fixed part is clamped between the outer periphery of the second shell and the second diaphragm assembly, the rigid connecting piece is arranged on the inner fixed part, the inner fixed part is connected with the voice coil and electrically connected with the lead wire of the voice coil.

[0043] In an embodiment, the edge magnetic part comprises an edge magnet and an edge magnetic plate arranged in layers, the edge magnet is connected with the magnetic yoke, the edge magnetic plate is arranged opposite to the center magnetic plate, and the magnetization direction of the edge magnet is opposite to that of the first center magnet.

[0044] The utility model also proposes a sound generating module, the sound generating module comprises:

[0045] A module shell, the module shell is provided with a mounting cavity and a sound outlet communicating with the mounting cavity; and

[0046] The sound generating device is arranged in the mounting cavity, a front sound cavity is formed between the first diaphragm assembly of the sound generating device and the module shell, and the front sound cavity communicates with the sound outlet;

[0047] The sound generating cavity of the sound generating device is communicated with the sound outlet through the front sound cavity, or 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.

[0048] The utility model discloses an electronic equipment, the electronic equipment includes the sound generating device of above-mentioned,

[0049] Or, the electronic equipment includes the sound generating module of above-mentioned.

[0050] The sound generating device of the utility model technical scheme is by with the magnetic circuit system and vibration system are housed in the shell, and the magnetic circuit system is set to the magnetic yoke and is arranged in the center magnetic part and the side magnetic part of magnetic yoke, make the side magnetic part be located the outside of center magnetic part, and with center magnetic part enclose and form the magnetic gap, and set vibration system first diaphragm subassembly, second diaphragm subassembly, voice coil, diaphragm and rigid connecting piece, make the inside of the inside folding ring of first diaphragm subassembly with center magnetic part is connected, and the outer periphery of the outside folding ring is connected with the shell, and one end of voice coil is connected with first diaphragm subassembly, and the other end of voice coil is suspended in the magnetic gap, so that the current is passed in the voice coil, so that the voice coil converts electric energy into mechanical energy in the magnetic gap formed by the magnetic circuit system, to drive the voice coil to drive first diaphragm subassembly vibration, so as to realize sound generation, simultaneously, diaphragm and second diaphragm subassembly are sequentially arranged on the side of first diaphragm subassembly facing the magnetic yoke, and are located the outside of voice coil, make the outer edge of diaphragm and second diaphragm subassembly all with the shell is connected, and the inner edge of diaphragm is connected with the inner edge of second diaphragm subassembly, to form the sound generating cavity between diaphragm and second diaphragm subassembly, and set the sound outlet hole in the shell, so that the sound generating cavity is communicated with the sound outlet hole, and one end of rigid connecting piece is connected with second diaphragm subassembly, and the other end of rigid connecting piece is connected with voice coil, so that the voice coil drives second diaphragm subassembly vibration through rigid connecting piece, so that the volume between diaphragm and second diaphragm subassembly relatively changes to promote the air in the sound generating cavity to flow through the sound outlet hole smoothly, to increase the effective vibration area when the sound generating device vibrates, so as to improve the performance of the sound generating device, further by the center magnetic part is set to the magnetic structure, namely, the center magnetic part includes the first center magnet, center magnetic plate and second center magnet of laminated arrangement, first center magnet and second center magnet are magnetized along the vibration direction of vibration system and the magnetization direction is opposite, so that the magnetic field intensity of the magnetic circuit system of the sound generating device can be improved, and the performance of the sound generating device is improved as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced as follows. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in the drawings without any creative effort.

[0052] Figure 1 A top view structural schematic diagram of an embodiment of the sound generating device provided by the present application;

[0053] Figure 2 A bottom view structural schematic diagram of an embodiment of the sound generating device provided by the present application;

[0054] Figure 3 An exploded schematic diagram of an embodiment of the sound generating device provided by the present application;

[0055] Figure 4 A sectional view schematic diagram of an embodiment of the sound generating device provided by the present application;

[0056] Figure 5 A sectional view schematic diagram of another view of an embodiment of the sound generating device provided by the present application;

[0057] Figure 6 A structural schematic diagram of another embodiment of the sound generating device provided by the present application;

[0058] Figure 7 A partial top view structural schematic diagram of an embodiment of the sound generating device provided by the present application;

[0059] Figure 8 A top view structural schematic diagram of the connection of the magnetic circuit system, the centering support sheet and the rigid connecting piece in an embodiment of the sound generating device provided by the present application;

[0060] Figure 9 An exploded schematic diagram of Figure 8 ;

[0061] Figure 10 A top view structural schematic diagram of the connection of the magnetic circuit system, the centering support sheet and the rigid connecting piece in another embodiment of the sound generating device provided by the present application;

[0062] Figure 11 An exploded schematic diagram of the centering support sheet and the rigid connecting piece in an embodiment of the present application;

[0063] Figure 12 A structural schematic diagram of the centering support sheet and the rigid connecting piece in another embodiment of the present application;

[0064] Figure 13Structure diagram of the diaphragm in one embodiment of the utility model;

[0065] Figure 14 Structure diagram of the second vibrating plate in one embodiment of the utility model;

[0066] Figure 15 Structure diagram of the second vibrating plate in another embodiment of the utility model;

[0067] Figure 16 Sectional view schematic diagram of one embodiment of the sound production module provided by the utility model;

[0068] Figure 17 Sectional view schematic diagram of another view of one embodiment of the sound production module provided by the utility model.

[0069] Explanation of the reference signs:

[0070] 100, sound production device; 1, shell; 11, first shell; 111, sound outlet 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 vibrating diaphragm assembly; 311, inner bending ring; 312, first vibrating plate; 3121, second bending part; 313, outer bending ring; 3131, third flange; 32, second vibrating 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 extending 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 extending part; 35, rigid connecting piece; 351, rigid connecting part; 352, fourth extending part; 36, centering support sheet; 361, outer fixed part; 362, inner fixed part; 3621, main body part; 3622, third extending 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.

[0071] The realization, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0072] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0073] 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 position 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.

[0074] Meanwhile, "and / or" or "and / or" appearing in the entire 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.

[0075] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features 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.

[0076] In recent years, with the rapid development of consumer electronics, people's requirements for electronic products are constantly improving. In addition to the performance difference of the product itself, for example, portability, comfort is one of the 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 this 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.

[0081] 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.

[0082] 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 equipped with a sound hole 111, the magnetic circuit system 2 is connected to the shell 1, the magnetic circuit system 2 includes a center magnetic part 22 and a side magnetic part 23 arranged at the center magnetic part 22 of a magnetic yoke 21, the side magnetic part 23 is located at 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 with 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 with the second center magnet 223, 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, 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 at the outside of the voice coil 33, the outer edges of the diaphragm 34 and the second diaphragm assembly 32 are connected with the shell 1, the inner edge of the diaphragm 34 is connected with 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 with the second diaphragm assembly 32, the other end of the rigid connecting piece 35 is connected with the voice coil 33 to drive the second diaphragm assembly 32 to vibrate through the rigid connecting piece 35.

[0083] 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.

[0084] 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 periphery of the first diaphragm assembly 31 of the vibration system 3 can be connected with 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.

[0085] 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 6As shown, the sound production device 100 further comprises a housing 1, and the magnetic circuit system 2 and the vibration system 3 are both 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, and the periphery of the first diaphragm assembly 31 of the vibration system 3 is connected to the other end of the housing 1, which is arranged opposite to the magnetic circuit system 2 and the inner periphery of the first diaphragm assembly 31 is connected to the central magnetic portion 22 of the magnetic circuit system 2.

[0086] In the present 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 base 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 present embodiment, the housing 1 can be selected as 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 respectively, 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.

[0087] In the present 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 an electronic device or a sound production module, which is not limited herein.

[0088] It can be understood that by setting the magnetic circuit system 2 as the magnetic yoke 21 and the center magnetic part 22 and the side magnetic part 23 arranged on the magnetic yoke 21, at this time the magnetic circuit system 2 can be 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 center magnetic part 22 and encloses the center magnetic part 22 to form the magnetic gap 24, so that one end of the first diaphragm assembly 31 of the vibration system 3 is connected away from the magnetic yoke 21 of the shell 1, the inner side of the first diaphragm assembly 31 is connected with the center 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, so that 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, by arranging the center magnetic part 22 as a magnetic structure, the first center magnet 221, the center magnetic plate 222 and the second center magnet 223 are sequentially stacked in the vertical direction on the magnetic yoke 21, 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 direction of the first center magnet 221 is opposite to that of the second center magnet 223, so that the magnetic flux of the first center magnet 221 and the second center magnet 223 is gathered on the center magnetic plate 222 by the magnetic conduction of the center magnetic plate 222, and is transmitted to the magnetic gap 24 by the center magnetic plate 222, so that the center 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, and increasing the magnetic field force acting on the voice coil 33, thereby effectively improving the BL value.

[0089] In the embodiment, by arranging the first diaphragm assembly 31 as the inner folding ring 311, the first vibration plate 312 and the outer folding ring 313 connected in sequence, the inner side of the inner folding ring 311 is connected with the second center magnet 223, 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 piece or a skeleton, which is not limited herein.

[0090] Alternatively, 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] In the embodiment, the outer folded ring 313 and the inner folded ring 311 of the first diaphragm assembly 31 can be a convex structure protruding upward or a concave structure 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.

[0096] In order to further increase the connection area of the outer folded ring 313 of the first diaphragm assembly 31 and the shell 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] It can be understood that when the current is passed through the voice coil 33, the voice coil 33 converts the electrical energy into mechanical energy in the magnetic gap 24 formed by the magnetic circuit system 2 to drive the voice coil 33 to vibrate the first diaphragm assembly 31, so as to realize sound generation, and at the same time, the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting piece 35, so that the volume between the second diaphragm assembly 32 and the diaphragm 34 changes relatively to push the air in the sound generation cavity 4 to flow smoothly through the sound hole 111. At this time, the sound generation device 100 increases the diaphragm 34 and the second diaphragm assembly 32 on the basis of the conventional loudspeaker, and utilizes the sound generation device 100 to work, the voice coil 33 drives the first diaphragm assembly 31, the second diaphragm assembly 32 and the diaphragm 34 to vibrate at the same time, so as to increase the effective vibration area of the sound generation device 100 when vibrating, thereby improving the performance of the sound generation device 100.

[0101] In the embodiment, the structure of the second diaphragm assembly 32 can be a diaphragm structure or other structure capable of vibrating to generate sound, which is not limited here. The structure of the diaphragm 34 can be a structure capable of vibrating and deforming. Optionally, the diaphragm 34 is a flexible piece, and the diaphragm 34 is a single-layer PEEK (polyether ether ketone) film, a composite PEEK (polyether ether ketone) film or other flexible material. It can be understood that the rigid connecting piece 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 connecting piece 35. The rigid connecting piece 35 can be a metal material such as stainless steel or other material with certain strength such as carbon fiber, which is not limited here.

[0102] It should be noted that the sound generation cavity 4 formed between the diaphragm 34 and the second diaphragm assembly 32 is a sealed front cavity. When the sound generation device 100 works, the vibration directions of the first diaphragm assembly 31 and the second diaphragm assembly 32 are the same, and the volume of the sound generation cavity 4 is increased to push the air volume when working, thereby increasing the effective vibration area of the product. At the same time, by arranging the diaphragm 34 and the second diaphragm assembly 32, the sound generation device 100 increases the effective vibration area by using the Z-direction space of itself, so as to increase the Sd of the sound generation device 100, and at the same time, the Sd loss caused by the connection of the inner folding ring 311 of the first diaphragm assembly 31 and the center magnetic part 22 is reduced, thereby improving the performance of the sound generation device 100.

[0103] 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 1:1.5-1:3. In the 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., which is not limited here.

[0104] It can be understood that, 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, so that the diaphragm 34 has a reverse 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 is utilized to increase the air volume during work, so as to realize the increase of the effective vibration area of the product.

[0105] The sound generating device 100 of the utility model through the magnetic circuit system 2 and the vibration system 3 are housed in the shell 1, and the magnetic circuit system 2 is arranged as the magnetic yoke 21 and the center magnetic part 22 and the side magnetic part 23 arranged on the magnetic yoke 21, so that the side magnetic part 23 is located on the outside of the center magnetic part 22, and the center magnetic part 22 and the side magnetic part 23 enclose the magnetic gap 24, and the vibration system 3 is arranged as the first diaphragm assembly 31, the second diaphragm assembly 32, the voice coil 33, the diaphragm 34 and the 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 center 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 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, so as to realize sound generation; at the same time, the diaphragm 34 and the second diaphragm assembly 32 are arranged on the side of the first diaphragm assembly 31 facing the magnetic yoke 21 in sequence, and are located on the outside of 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 the sound generating cavity 4 between the diaphragm 34 and the second diaphragm assembly 32, and the sound hole 111 is arranged on the shell 1, so that the sound generating cavity 4 is communicated with the sound 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 hole 111, to increase the effective vibration area when the sound generating device 100 vibrates, so as to improve the performance of the sound generating device 100; further, the center magnetic part 22 is a pair of 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.

[0106] In an embodiment, the first vibration plate 312 is bent and extended towards the voice coil 33 to form a second bending part 3121, and the second bending part 3121 is connected with the voice coil 33.

[0107] In the embodiment, as shown in Figures 3 to 5 , the second bending part 3121 is formed by bending the inner side of the first vibrating plate 312 towards the direction close to the voice coil 33, so that the first vibrating plate 312 is connected with the voice coil 33 through the second bending part 3121, and the voice coil 33 is suspended in a more reasonable position in the magnetic gap 24 by the second bending part 3121, so as to ensure the effect of the magnetic circuit system 2 driving the voice coil 33 to vibrate.

[0108] It can be understood that the second bending part 3121 is formed by bending the inner side of the first vibrating plate 312 towards the direction close to the voice coil 33. Alternatively, the first vibrating plate 312 and the second bending part 3121 are integrally formed, for example, integrally injection molded or integrally stamped, which is not limited here.

[0109] In another embodiment, the first diaphragm assembly 31 further comprises a support, and the two ends of the support are respectively connected with the first vibrating plate 312 and the voice coil 33. It can be understood that the support can be connected with the first vibrating plate 312 by bonding, welding or integrally injection molding, so that the first vibrating plate 312 is connected with the voice coil 33 through the support, and the voice coil 33 is suspended in a more reasonable position in the magnetic gap 24 by the support, so as to ensure the effect of the magnetic circuit system 2 driving the voice coil 33 to vibrate.

[0110] In an embodiment, the second diaphragm assembly 32 comprises a folded ring part 321 and a second vibrating plate 322, the outer periphery of the folded ring part 321 is connected with the shell 1, and the second vibrating plate 322 comprises a main body part 3221 connected with the inner edge of the folded ring part 321 and a first bending part 3222 formed by bending and extending the main body part 3221 towards the diaphragm 34, and the first bending part 3222 is connected with the inner edge of the diaphragm 34.

[0111] In the embodiment, the folded ring part 321 of the second diaphragm assembly 32 can be a convex structure protruding upwards or a concave structure recessing downwards, which is not limited here. In order to facilitate the connection of the folded ring part 321 with the shell 1, as shown in Figures 4 to 6 , the outer periphery of the folded ring part 321 is bent to form a first flange 3211, and the first flange 3211 is connected with the outer wall of the shell 1.

[0112] It can be understood that the first flange 3211 is formed by extending the outer periphery of the folded ring part 321 along the vibration direction of the vibration system, and the first flange 3211 can be connected with the outer side wall of the shell 1, so as to increase the connection area of the folded ring part 321 with the shell 1 and improve the connection stability and waterproof sealing performance. Of course, the outer side of the folded ring part 321 has a horizontal part extending along the direction perpendicular to the vibration direction of the vibration system, the horizontal part is connected with the end face of the shell 1, and the outer side of the horizontal part extends along the vibration direction of the vibration system to form the first flange 3211, which is not limited here.

[0113] In the embodiment, the second vibrating plate 322 is arranged as the main body part 3221 and the first bending part 3222, the one end of the main body part 3221 away from the first bending part 3222 is connected with the inner edge of the folded ring part 321, and the first bending part 3222 is connected with the inner edge of the diaphragm 34, so that the inner edge of the diaphragm 34 is connected with the side edge of the second vibrating plate 322 of the second vibrating diaphragm assembly 32, to form the sound generating cavity 4 with the diaphragm 34, the second vibrating plate 322 of the second vibrating diaphragm assembly 32, the folded ring part 321 and the shell 1. It can be understood that the second vibrating plate 322 of the second vibrating diaphragm assembly 32 is connected with the voice coil 33 through the rigid connecting part 35. When the voice coil 33 drives the second vibrating diaphragm assembly 32 to vibrate through the rigid connecting part 35, the second vibrating plate 322 of the second vibrating diaphragm assembly 32 drives the diaphragm 34 to vibrate and deform.

[0114] Optionally, the folded ring part 321 of the second vibrating diaphragm assembly 32 and the second vibrating plate 322 are connected by bonding or integrally injection molded, which is not limited herein. In the embodiment, the main body part 3221 and the first bending part 3222 of the second vibrating plate 322 are integrally formed, and the first bending part 3222 is formed by bending and extending from the main body part 3221 towards the diaphragm 34, for example by injection molding or stamping forming, which is not limited herein.

[0115] In an embodiment, an inclined part 3223 is formed at the connection between the main body part 3221 and the first bending part 3222, and the inclined part 3223 is arranged at an angle with the vibration direction of the vibration system 3.

[0116] It can be understood that, as shown in FIGS. Figures 3 to 5 , Figure 14 The plane where the inclined part 3223 is located is arranged at an angle with the vibration direction of the vibration system 3, and the angle is optionally greater than 0° and less than 90°. The arrangement of the inclined part 3223 can improve the rigidity of the second vibrating plate 322 in the horizontal direction (i.e. perpendicular to the vibration direction of the vibration system 3), thereby improving the vibration performance of the second vibrating diaphragm assembly 32 and the feasibility of molding. At the same time, the inclined part 3223 is farther away from the magnetic circuit system 2 relative to the inner edge of the second vibrating 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 generating device 100; and the inclined part 3223 is more convenient for positioning and connecting the second vibrating plate 322 and the folded ring part 321, thereby improving the connection precision. Optionally, the second vibrating plate 322 can be magnesium-aluminum alloy, magnesium-lithium alloy, etc., which is not limited herein.

[0117] In an embodiment, the diaphragm 34 is a flexible member, the diaphragm 34 comprises 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 outer shell 1, the inner edge of the inner connecting portion 343 is connected with the first bending portion 3222, and the deformation portion 342 is in a bending shape.

[0118] 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 generating cavity 4 through the sound hole 111, thereby increasing the effective vibration area when the sound generating device 100 vibrates, thereby improving the performance of the sound generating device 100.

[0119] 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 bending portion 3222, so that the diaphragm 34 can be connected and fixed with the outer shell 1 through the outer connecting portion 341, and the diaphragm 34 can be connected with the inner edge of the second diaphragm assembly 32 through the inner connecting portion 343, so that the sealed sound generating cavity 4 is formed between the diaphragm 34 and the second diaphragm assembly 32, and the deformation portion 342 is set as a bending shape, so as to improve the deformation ability of the diaphragm 34, thereby driving the diaphragm 34 to vibrate and deform when the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting member 35.

[0120] In an embodiment, the inner edge of the inner connecting portion 343 extends towards the first bending portion 3222 to form a second flange 3431, and the second flange 3431 is connected with the first bending portion 3222.

[0121] In the present embodiment, as shown in Figures 3 to 5 , Figure 13 , by setting the second flange 3431 on the inner edge of the inner connecting portion 343, and further connecting the second flange 3431 with the first bending portion 3222, the connection stability is improved, and the waterproof sealing performance is further improved. Alternatively, the second flange 3431 is formed by extending the inner edge of the inner connecting portion 343 towards the first bending portion 3222.

[0122] 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, etc., which is not limited herein.

[0123] In the embodiment, the compliance of the diaphragm 34 is optionally greater than the compliance of the folded 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 member 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.

[0124] It can be understood that the compliance of the diaphragm 34 is optionally greater than the compliance of the inner folded ring 311 of the first diaphragm assembly 31, and the compliance of the diaphragm 34 is optionally greater than the compliance of the outer folded 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.

[0125] Optionally, the deformed portion 342 protrudes towards the direction away from the first diaphragm assembly 31, the folded ring portion 321 protrudes towards the direction close to the first diaphragm assembly 31, and the deformed portion 342 and the folded ring portion 321 are arranged in a staggered manner in the direction perpendicular to the vibration system 3. It can be understood that in this way, the folded ring portion 321 of the second diaphragm assembly 32 avoids interference with the deformed portion 342 of the diaphragm 34 during vibration. Of course, in other embodiments, the folded ring portion 321 can also protrude towards the direction away from the first diaphragm assembly 31, which is not limited herein.

[0126] In an embodiment, along the vibration direction of the vibration system 3, the projection width L1 of the deformed portion 342 is greater than or equal to the projection width L2 of the folded ring portion 321, and the ratio of L1 to L2 is 1:1-3:1.

[0127] In the embodiment, as shown in Figure 4 along the vibration direction of the vibration system 3, by setting the projection width L1 of the deformed portion 342 of the diaphragm 34 to be greater than or equal to the projection width L2 of the folded ring portion 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. In this way, when the voice coil 33 drives the second diaphragm assembly 32 and the diaphragm 34 to vibrate, the diaphragm 34 generates a reverse effect on the air volume, and the second diaphragm assembly 32 generates a positive effect on the air volume, and the volume change of the sound generating cavity 4 increases the working air volume, thereby realizing the increase of the effective vibration area of the product.

[0128] 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.

[0129] In an embodiment, the plurality of side magnetic portions 23 are arranged around and spaced apart from the outer side of the center magnetic portion 22, and the avoidance space 233 is formed between two adjacent side magnetic portions 23. The second diaphragm 322 has a first extension portion 3224 extending into the avoidance space 233, and the diaphragm 34 has a second extension portion 344 extending into the avoidance space 233, and the second extension portion 344 is connected to the first extension portion 3224.

[0130] In the embodiment, as shown in Figure 3 、 Figures 7 to 9 、 Figure 15 , the plurality of side magnetic portions 23 are arranged around and spaced apart from the outer side of the center magnetic portion 22, and the avoidance space 233 is formed between two adjacent side magnetic portions 23. Thus, the avoidance space 233 provides a space for the rigid connecting member 35 to move, and the rigid connecting member 35 is arranged in the avoidance space 233. One end of the rigid connecting member 35 is connected to the second diaphragm assembly 32, and the other end of the rigid connecting member 35 is connected to the voice coil 33. Thus, the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting member 35.

[0131] It can be understood that the first extension portion 3224 is arranged on the second diaphragm assembly 32, and extends towards the avoidance space 233 and is connected to the rigid connecting member 35. Thus, the connection stability between the second diaphragm assembly 32 and the rigid connecting member 35 is increased, so as to ensure that the voice coil 33 drives the second diaphragm assembly 32 to vibrate through the rigid connecting member 35. Alternatively, the first extension portion 3224 is formed by the second diaphragm 322 extending towards the avoidance space 233.

[0132] In the embodiment, as shown in Figure 13 , the diaphragm 34 has the second extension portion 344 extending into the avoidance space 233, and the second extension portion 344 is connected to the first extension portion 3224. Thus, the connection stability and sealing performance between the diaphragm 34 and the second diaphragm 322 are further increased. It can be understood that, as shown in Figure 13 , the inner connecting portion 343 and the second flange 3431 of the diaphragm 34 both extend into the avoidance space 233 and form the second extension portion 344, which is not limited herein.

[0133] In another embodiment, the plurality of side magnetic portions 23 are arranged around and spaced apart from the outer side of the center magnetic portion 22, and the avoidance space 233 is formed between two adjacent side magnetic portions 23. The voice coil 33 has a first protrusion portion 331 extending into the avoidance space 233, and the center magnetic portion 22 has a second protrusion portion 224 extending into the avoidance space 233, and the first protrusion portion 331 is arranged opposite to the second protrusion portion 224.

[0134] In the embodiment, as shown in Figure 10As shown, the plurality of side magnetic portions 23 are arranged around and spaced apart from the outer side of the central magnetic portion 22, so that an avoidance space 233 is formed between two adjacent side magnetic portions 23. By arranging the first protruding portion 331 on the voice coil 33, the first protruding portion 331 extends to the avoidance space 233. By arranging the second protruding portion 224 on the central magnetic portion 22, the second protruding portion 224 extends to the avoidance space 233 and is spaced apart from and corresponds to the first protruding portion 331. In this way, on the one hand, the length of the wire of the voice coil 33 is increased, thereby facilitating the rigid connecting piece 35 to connect the voice coil 33 and the second diaphragm assembly 32. On the other hand, the magnetic volume of the central magnetic portion 22 is increased, thereby effectively improving the magnetic field strength and further improving the BL value of the sound generating device 100.

[0135] It can be understood that the central magnetic portion 22 can be rectangular in structure, and the voice coil 33 can be a rectangular voice coil. The avoidance space 233 of the side magnetic portion 23 is arranged corresponding to the corner position of the central magnetic portion 22. The four corner positions of the voice coil 33 are respectively provided with the first protruding portion 331. The four corner positions of the central magnetic portion 22 are respectively provided with the second protruding portion 224. This is not limited herein.

[0136] In an embodiment, the vibration system 3 further comprises a centering support sheet 36, the centering support sheet 36 comprising an outer fixed portion 361, an inner fixed portion 362, and a vibration arm 363 connecting the outer fixed portion 361 and the inner fixed portion 362. The outer fixed portion 361 is connected with the outer shell 1, and the rigid connecting piece 35 is arranged on the inner fixed portion 362. The second diaphragm assembly 32 comprises a folded ring portion 321 and a second vibration plate 322 connected with each other. The outer periphery of the folded ring portion 321 is connected with the outer shell 1, and the inner edge of the second vibration plate 322 is connected with the inner edge of the diaphragm 34. The inner fixed portion 362 is connected with the second vibration plate 322 and the voice coil 33, and is electrically connected with the lead wire of the voice coil 33.

[0137] In the present embodiment, as shown, Figures 3 to 12 The arrangement of the centering support sheet 36, on the one hand, enables the voice coil 33 to be connected with an external circuit through the centering support sheet 36. On the other hand, the centering support sheet 36 plays a centering role in the vibration of the voice coil 33 through the rigid connecting piece 35, thereby avoiding phenomena such as swinging or polarization of the voice coil 33 during vibration.

[0138] In order to avoid interference or influence of the arrangement of the centering support sheet 36 on the second diaphragm assembly 32, the folded ring portion 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 support sheet 36 can be one or multiple. When the centering support sheet 36 is multiple, the multiple centering support sheets 36 are distributed corresponding to the long axis direction and / or the short axis direction of the magnetic circuit system 2 and / or the four corner positions of the magnetic circuit system 2.

[0139] It can be understood that the plurality of centering fins 36 can be symmetrically distributed along the long axis direction of the magnetic circuit system 2; the plurality of centering fins 36 can also be symmetrically distributed along the short axis direction of the magnetic circuit system 2; the plurality of centering fins 36 can also be correspondingly arranged at the four corners of the magnetic circuit system 2. Of course, in other embodiments, the plurality of centering fins 36 can be correspondingly distributed along the long axis direction of the magnetic circuit system 2, the short axis direction of the magnetic circuit system 2, and the diagonal or four corners of the magnetic circuit system 2, which is not limited herein.

[0140] Optionally, the centering fin 36 includes two or four, which can not only utilize the centering fin 36 to connect and conduct the voice coil 33 and the external circuit, but also ensure the vibration balance of the sound generating device 100.

[0141] In an embodiment, the centering fin 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 at the inner fixed part 362.

[0142] In the present 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.

[0143] Optionally, the rigid connecting piece 35 is arranged at the side of the inner fixed part 362 away from the second diaphragm assembly 32. It can be understood that in this way, the distance between the centering fin 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, without the need to additionally increase the height size of the sound generating device 100 to meet the amplitude of the vibration system 3, which is beneficial to the thin type setting.

[0144] Optionally, as shown in Figure 3 , Figures 8 to 12 , the outer fixed part 361, the vibration arm 363 and the inner fixed part 362 of the centering fin 36 can be optionally formed as an integral structure. In this way, the structural strength of the centering fin 36 can be effectively ensured, and the processing steps of the centering fin 36 are simplified. In order to ensure the deformation ability of the centering fin 36, the vibration arm 363 has at least one bending.

[0145] In an embodiment, as shown in Figure 3 , Figures 8 to 12 , the outer fixed part 361, the vibration arm 363 and the inner fixed part 362 of the centering fin 36 are formed as an integral structure.As shown, the outer fixing part 361 is annularly arranged, and has alternating short-axis sides and long-axis sides. The vibration arm 363 is led out from one side of the inner fixing part 362 corresponding to the short-axis side, and extends along the long-axis side after being bent. The vibration arm 363 is connected to the center region of the long-axis side.

[0146] In the embodiment, as shown in Figure 3 , Figures 8 to 12 , the centering sheet 36 is one, and at this time, the outer fixing part 361 of the centering sheet 36 can be selected as a rectangular ring structure. The vibration arm 363 includes at least two, and the inner fixing part 362 can be selected as 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.

[0147] 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.

[0148] 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.

[0149] In the embodiment, as shown in Figure 8 , Figures 1 to 3 and Figure 5 , the voice coil 33 can be selected as a rectangular ring, and the four inner fixing parts 362 of the centering sheet 36 are respectively arranged at the four corner positions of the voice coil 33, which is not limited herein. It can be understood that the outer fixing part 361 of the centering sheet 36 is adhesively connected to the shell 1, and the inner fixing part 362 and the rigid connecting piece 35 can be adhesively connected, welded or integrally formed, which is not limited herein. In this way, the length of the vibration arm 363 of the centering sheet 36 can be increased by using the length of the product size, so that the reliability is better when working at a large amplitude. At the same time, the centering sheet 36 provides constraint to the vibration system 3, and can better inhibit the performance deterioration caused by product polarization at a large amplitude.

[0150] 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 As shown, the centering branch 36 further comprises a conductive part 364, one end of the conductive part 364 is connected with the outer fixing part 361, the other end of the conductive part 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 part 364, so as to facilitate the connection and conduction of the external circuit with the centering branch 36, and ensure the current flowing into the voice coil 33.

[0151] In an embodiment, the magnetic conductive yoke 21 is provided with a avoiding structure 211 corresponding to the inner fixing part 362. As can be understood, Figure 9 、 Figure 3 and Figures 8 to 12 As shown, by providing the avoiding structure 211 on the magnetic conductive yoke 21, the avoiding structure 211 can be used to provide avoiding for the centering branch 36 during the vibration of the second diaphragm assembly 32, so as to ensure that the inner fixing part 362 or the rigid connecting piece 35 of the centering branch 36 will not touch the magnetic conductive yoke 21.

[0152] Optionally, the avoiding structure 211 is a recessed groove or a through hole. As can be understood, the avoiding structure 211 is a recessed groove, that is, the side of the magnetic conductive yoke 21 facing the centering branch 36 is recessed to form a groove structure away from the centering branch 36. The avoiding structure 211 is a through hole, that is, the through hole penetrates the magnetic conductive 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.

[0153] In an embodiment, the inner fixing part 362 comprises 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 vibration 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.

[0154] In the embodiment, as shown in Figure 3 、 Figures 8 to 12 By setting the inner fixing part 362 of the centering branch 36 as the body part 3621 and the third extending part 3622, the third extending part 3622 extends towards the voice coil 33, so that the body part 3621 of the inner fixing part 362 is connected with the second vibration plate 322 of the second diaphragm assembly 32, and at the same time, the inner fixing part 362 of the centering branch 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 the vibration.

[0155] It can be understood that by providing the inner pad 3623 on the third extension 3622 or the body portion 3621, the inner pad 3623 can be conveniently electrically connected with the lead wire of the voice coil 33, so as to ensure that the voice coil 33 is connected with the external circuit through the centering support 36.

[0156] In an embodiment, the rigid connecting piece 35 includes a rigid connecting portion 351 and a fourth extension 352 extending from the rigid connecting portion 351 towards the voice coil 33, the rigid connecting portion 351 is connected with the body portion 3621, and the fourth extension 352 is connected with the third extension 3622.

[0157] In the embodiment, as shown in Figures 3 to 6 , Figure 9 , by providing the rigid connecting piece 35 as the rigid connecting portion 351 and the fourth extension 352, the rigid connecting piece 35 can be connected with the inner fixing portion 362 of the centering support 36 through the rigid connecting portion 351 and connected with the voice coil 33 through the fourth extension 352, so as to ensure the connection strength of the rigid connecting piece 35 connecting the voice coil 33 and the second diaphragm assembly 32, and further ensure that the voice coil 33 drives the second diaphragm assembly 32 to vibrate during vibration.

[0158] In an embodiment, the shell 1 includes a first shell 11 and a second shell 12, the first shell 11 is provided with a sound hole 111, the outer periphery of the outer folding ring 313 and the outer periphery of the diaphragm 34 are connected with the first shell 11, the magnetic yoke 21 is connected with 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.

[0159] In the embodiment, as shown in Figures 3 to 12 , Figure 6 , by providing the shell 1 as the first shell 11 and the second shell 12, the first shell 11 can be conveniently used to fix and install the outer periphery of the first diaphragm assembly 31 and the diaphragm 34, the second shell 12 can be used to fix and install the magnetic circuit system 2, and the first shell 11 and the second shell 12 can be used to fix and install the outer periphery of the second diaphragm assembly 32.

[0160] It can be understood that the outer periphery of the outer folding ring 313 of the first diaphragm assembly 31 and the outer periphery of the diaphragm 34 are connected with the first shell 11, the magnetic yoke 21 is connected with 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.

[0161] In an embodiment, as shown in Figure 6As shown, the vibration system 3 further comprises a centering vane 36, which comprises 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 clamped between the second shell 12 and the outer periphery of the second diaphragm assembly 32, the rigid connecting piece 35 is arranged on the inner fixed part 362, the inner fixed part 362 is connected with the voice coil 33 and electrically connected with the lead wire of the voice coil 33.

[0162] 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.

[0163] 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.

[0164] In an embodiment, the first shell 11 can be a metal shell, and the second shell 12 can be a metal shell.

[0165] 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.

[0166] 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.

[0167] In an embodiment, the first shell 11 has a side wall 112 and an inner bent portion 113 formed by the side wall 112 extending and bending inwardly from an end of the side wall 112 away from the second shell 12, the outer periphery of the outer bent ring 313 and the diaphragm 34 are connected to the inner bent portion 113, and the outer periphery of the second diaphragm assembly 32 is clamped between an end of the side wall 112 away from the inner bent portion 113 and the second shell 12; wherein the sound hole 111 is arranged on the side wall 112 or the inner bent portion 113.

[0168] In the present embodiment, as shown in Figure 5 the first shell 11 is arranged as a side wall 112 and an inner bent portion 113 arranged at an angle, so that the inner bent portion 113 of the first shell 11 is used to mount and fix the first diaphragm assembly 31 and the diaphragm 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 bracket 36 in cooperation with the second shell 12, that is, the outer periphery of the bent ring portion 321 of the second diaphragm assembly 32 and the outer fixing portion 361 of the centering bracket 36 are clamped between an end of the side wall 112 away from the inner bent portion 113 and the second shell 12.

[0169] It can be understood that the outer fixing portion 361 of the centering bracket 36 is located between the outer periphery of the bent ring portion 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 present embodiment, the inner bent portion 113 of the first shell 11 is formed by extending and bending inwardly from an end of the side wall 112 away from the second shell 12, that is, the inner bent portion 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.

[0170] 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 bent ring 313 of the first diaphragm assembly 31 is bent and extended to form a third flange 3131, and the third flange 3131 is connected to the outer wall surface of the side wall 112 of the first shell 11.

[0171] In the present embodiment, the outer bent ring 313 of the first diaphragm assembly 31 is fixed to the inner bent portion 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, so that the product effective vibration area can be increased by using the product outer shape size. At the same time, 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 increased or decreased according to the requirements of the product amplitude, so that the sound emitting cavity 4 between the diaphragm 34 and the second diaphragm assembly 32 can adapt to the needs of different products.

[0172] Optionally, the sound hole 111 is arranged on the side wall 112 or the inner bending part 113, which is not limited here.

[0173] 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 in opposite directions, and the inner side surface is connected to the upper surface and the lower surface and is located at one end of the inner bending part 113 away from the side wall 112.

[0174] In the present embodiment, as shown in Figures 3 to 5 and Figure 9 , the outer periphery of the outer bending 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 fixation of the first diaphragm assembly 31 and the diaphragm 34 can be realized, and the distance between the first diaphragm assembly 31 and the diaphragm 34 can be ensured, thereby avoiding interference and other problems during vibration.

[0175] Of course, in other embodiments, the outer periphery of the outer bending 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 bending 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 bending ring 313 and the upper surface; or, the outer periphery of the outer bending 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 bending ring 313 and the diaphragm 34 are both connected to the inner side surface, which is not limited here.

[0176] It can be understood that the outer connecting part 341 of the diaphragm 34 can be connected to the lower surface or the inner side surface or the upper surface of the inner bending part 113, which is not limited here. In the present embodiment, when the outer connecting part 341 of the diaphragm 34 and the outer periphery of the outer bending ring 313 are both connected to the upper surface of the inner bending part 113, the outer connecting part 341 of the diaphragm 34 is located between the outer periphery of the outer bending ring 313 and the upper surface of the inner bending part 113, which is not limited here.

[0177] In an embodiment, the center magnetic part 22 includes a first center magnet 221, a center magnetic plate 222 and a second center magnet 223 which are stacked, the first center magnet 221 is connected to the magnetic yoke 21, and the inner side of the inner bending ring 311 is connected to the second center magnet 223.

[0178] In the present embodiment, as shown in Figures 3 to 5 , Figure 9As shown, by setting the central magnetic part 22 as a magnetic structure, the first central magnet 221, the central magnetic conducting plate 222 and the second central magnet 223 are sequentially stacked in the vertical direction on the magnetic conducting yoke 21. It can be understood that the first central magnet 221 and the second central magnet 223 are magnetized along the vibration direction of the vibration system 3, and the magnetization direction of the first central magnet 221 is opposite to that of the second central magnet 223. Thus, by using the magnetic conducting effect of the central magnetic conducting plate 222, the magnetic induction lines of the first central magnet 221 and the second central magnet 223 are gathered in the central magnetic conducting plate 222 and transmitted to the magnetic gap 24 by the central magnetic conducting plate 222, so that the central magnetic part 22 generates a magnetic field with a strong magnetic field strength passing 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 received by the voice coil 33, and effectively improving the BL value.

[0179] 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.

[0180] 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 conducting plate 222 and the magnetic conducting 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 near the central magnetic conducting plate 222 are the same.

[0181] Optionally, the central magnetic conducting plate 222 of the central magnetic part 22 can be an integral square plate structure and located between the first central magnet 221 and the second central magnet 223; or, the central magnetic conducting plate 222 includes a plurality of central magnetic conducting plates 222, the plurality of central magnetic conducting 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 conducting plates 222 cooperatively form a square plate structure, which is not limited herein.

[0182] 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.

[0183] 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 on the side of the central magnetic conductive plate 222 facing 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. Alternatively, the magnetic poles of the plurality of second central magnets 223 on the side of the central magnetic conductive plate 222 are the same.

[0184] 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 shown, the edge of the second central magnet 223 is provided with a relief structure.

[0185] In the embodiment, the relief structure is arranged around the circumference of the side of the second central magnet 223 facing away from the central magnetic conductive plate 222, that is, the relief structure is an integral annular inclined surface. Of course, in other embodiments, the relief structure includes a plurality of relief structures, the plurality of relief structures are arranged at intervals and arranged around the circumference of the side of the second central magnet 223 facing away from the central magnetic conductive plate 222, at this time, the adjacent two relief structures are not connected and have a certain interval. Alternatively, the relief structure includes a plurality of relief structures, the adjacent relief structures are connected end to end to form a closed ring structure and arranged around the circumference of the side of the second central magnet 223 facing away from the central magnetic conductive plate 222, at this time, the adjacent relief structures in the plurality of relief structures are adjacent and form an annular structure. Alternatively, the included angles formed by the plurality of relief structures and the surface of the side of the second central magnet 223 facing away from the central magnetic conductive plate 222 can be the same, different, or at least partially the same, which is not limited here.

[0186] Alternatively, the relief structure can be at least one of an inclined inclined surface, a rounded corner, a chamfered corner, and a stepped structure.

[0187] In an embodiment, the included angle formed by the relief structure and the surface of the side of the second central magnet 223 facing away from the central magnetic conductive plate 222 is greater than 90° and less than 180°. In the embodiment, the included angle formed by the relief structure and the surface of the side of the second central magnet 223 facing away from the central magnetic conductive plate 222 is further optionally 100°-150°, which is not limited here. Alternatively, the included angle is 100°, 110°, 120°, 130°, 140°, 150°, etc., which is not limited here.

[0188] In an embodiment, the side magnetic part 23 comprises a side magnet 231 and a side magnetic plate 232 which are stacked, the side magnet 231 is connected with the magnetic yoke 21, the side magnetic plate 232 is arranged opposite to the center magnetic plate 222, the side magnet 231 is magnetized along the vibration direction of the vibration system 3, and the magnetization direction of the side magnet 231 is opposite to that of the first center magnet 221.

[0189] It can be understood that, as shown in Figure 16 , Figure 17 , 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 center magnetic part 22 and are spaced apart to form a magnetic gap 24. In this embodiment, the side magnet 231 can be selected as a permanent magnet, and the side magnetic plate 232 can be selected as a magnetic plate structure, which is not limited here.

[0190] In this embodiment, the side magnetic part 23 comprises a plurality of side magnetic parts 23 which are arranged around the outside of the center magnetic part 22 and are spaced apart from the center magnetic part 22 to form a magnetic gap 24. At this time, the adjacent side magnetic parts 23 are spaced apart to form a clearance space 233, so that the clearance space 233 provides installation clearance and movement space for the rigid connecting piece 35 and the inner fixing part 362 of the centering fin. Alternatively, the side magnet 231 and the side magnetic plate 232 are both a plurality of and are arranged one by one.

[0191] 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, and the specific structure of the sound production device 100 refers to the foregoing embodiment, because the sound production module 600 adopts all the technical solutions of the foregoing all embodiments, at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, and here will not be repeated.

[0192] In an embodiment, the sound production module 600 further comprises 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, 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 directly.

[0193] In the embodiment, the sound production module 600 can be a front-firing structure or a side-firing structure. When the sound production module 600 is a front-firing structure, the sound outlet 520 of the module housing 500 is arranged opposite to 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 housing 11, and the sound hole 111 is arranged opposite to the sound outlet 520 of the module housing 500. At this time, the sound hole 111 is in communication with the front sound cavity 530; or, the sound hole 111 is in communication with the sound outlet 520 through the sound passage of the module housing 500, which is not limited herein.

[0194] Of course, the sound hole 111 on the shell 1 can also be arranged on the side wall 112 of the first housing 11, and the sound hole 111 is in communication with the sound outlet 520 through the sound passage of the module housing 500, which is not limited herein.

[0195] It can be understood that when the sound production module 600 is a side-firing structure, the sound outlet 520 of the module housing 500 is located on 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 portion 113 of the first housing 11, and the sound hole 111 is in communication with the sound outlet 520 through the sound passage of the module housing 500, which is not limited herein.

[0196] Of course, the sound hole 111 on the shell 1 can also be arranged on the side wall 112 of the first housing 11, and the sound hole 111 is in communication with the sound outlet 520 through the sound passage of the module housing 500; or, the sound hole 111 is arranged opposite to the sound outlet 520 of the module housing 500, which is not limited herein.

[0197] In an embodiment, the sound production module 600 further comprises a flexible circuit board, one end of the flexible circuit board is electrically connected to the centering support sheet 36 of the sound production device 100, and the other end of the flexible circuit board is used to connect an external power supply.

[0198] It can be understood that the flexible circuit board is used to connect and conduct 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 to the external 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 to connect an external terminal.

[0199] In the embodiment, the module housing 500 has a mounting cavity 510, the sound production device 100 is arranged in the mounting cavity 510 of the module housing 500, and at least one end of the flexible circuit board connected to the sound production device 100 is located in the mounting cavity 510 of the module housing 500. Of course, in other embodiments, the flexible circuit board can also be arranged in the mounting cavity 510 of the module housing 500, which is not limited herein.

[0200] The utility model also proposes an electronic equipment, the electronic equipment includes the sound production device 100. The specific structure of the sound production device 100 refers to the preceding embodiment, because the present electronic equipment has adopted all the technical schemes of the preceding all embodiments, therefore at least has all the beneficial effects brought by the technical scheme of the preceding embodiment, here will not repeat.

[0201] In the embodiment, the electronic equipment further includes a device housing, and the sound production device 100 and the flexible circuit board are arranged in the device housing. It can be understood that the electronic equipment can be earphones, mobile phones, smart wearable devices, etc., which are not limited here.

[0202] The utility model also proposes an electronic equipment, the electronic equipment includes the sound production device 100. The specific structure of the sound production device 100 refers to the preceding embodiment, because the present electronic equipment has adopted all the technical schemes of the preceding all embodiments, therefore at least has all the beneficial effects brought by the technical scheme of the preceding embodiment, here will not repeat.

[0203] It can be understood that the electronic equipment can be earphones, mobile phones, smart wearable devices, etc., which are not limited here. In the embodiment, the electronic equipment further includes a device housing, and the sound production device 100 and the flexible circuit board are arranged in the device housing.

[0204] The above-mentioned is only optional embodiment of the utility model, and does not limit the patent range of the utility model, and the equivalent structural transformation of the utility model specification and the attached drawing contents is made under the concept of the utility model, or direct / indirect application in other related technical fields are included in the patent protection range of the utility model.

Claims

1. A sound producing device, characterized by, The sound generating device comprises: a shell provided with a sound hole; a magnetic circuit system connected to the shell, the magnetic circuit system comprising a magnetic yoke, a center magnetic part and a side magnetic part provided on the magnetic yoke, the side magnetic part being located outside the center magnetic part and forming a magnetic gap with the center magnetic part, the center magnetic part comprising a first center magnet, a center magnetic plate and a second center magnet arranged in layers, the first center magnet being connected to the magnetic yoke; and a vibration system comprising a first diaphragm assembly, a second diaphragm assembly, a voice coil, a membrane 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 center magnet, the outer periphery of the outer folding ring being connected to the shell, 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 membrane 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 outer edges of the membrane and the second diaphragm assembly being connected to the shell, the inner edge of the membrane being connected to the inner edge of the second diaphragm assembly to form a sound generating cavity communicating with the sound hole between the membrane 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 center magnet and the second center magnet are magnetized along the vibration direction of the vibration system and in opposite directions.

2. The sound production device of claim 1, wherein The second diaphragm assembly comprises a folding ring part and a second vibration plate, the outer periphery of the folding ring part being connected to the shell, the second vibration plate comprising a main body part connected to the inner edge of the folding ring part and a first bending part formed by bending and extending from the main body part towards the membrane, the first bending part being connected to the inner edge of the membrane.

3. The sound production device of claim 2, wherein An inclined part is formed at the connection between the main body part and the first bending part, the inclined part being arranged at an angle to the vibration direction of the vibration system; and / or, the outer periphery of the folding ring part is bent to form a first flange, the first flange being connected to the outer wall of the shell.

4. The sound production device of claim 2, wherein, The side magnetic part comprises a plurality of side magnetic parts, an avoidance space being formed between adjacent two side magnetic parts, the second vibration plate having a first extension part extending into the avoidance space, the membrane having a second extension part extending into the avoidance space, the second extension part being connected to the first extension part correspondingly; or, the side magnetic part comprises a plurality of side magnetic parts, an avoidance space being formed between adjacent two side magnetic parts, the voice coil having a first protruding part extending into the avoidance space, the center magnetic part having a second protruding part extending into the avoidance space, the first protruding part and the second protruding part being arranged oppositely.

5. The sound production device of claim 2, wherein The diaphragm is a flexible member, and 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 with the shell, the inner edge of the inner connecting portion is connected with the first bending portion, and the deformation portion is in a bending shape.

6. The sound production device of claim 5, wherein The inner edge of the inner connecting portion is bent and extends towards the first bending portion to form a second flange, and the second flange is connected with the first bending portion. Furthermore, 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. Furthermore, the deformation portion protrudes in a direction away from the first diaphragm assembly, the folding ring portion protrudes in a direction close to the first diaphragm assembly, and the deformation portion and the folding ring portion are arranged in a staggered manner in a direction perpendicular to the vibration system. Furthermore, the inner folding ring and the outer folding ring both protrude in a direction away from the magnetic circuit system. Furthermore, the compliance of the diaphragm is greater than the compliance of the folding ring portion.

7. The sound production device of claim 1, wherein 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.

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

9. The sound production device of claim 1, wherein, The vibration system further comprises a centering support sheet, the centering support sheet comprises an outer fixed portion, an inner fixed portion and a vibration arm connecting the outer fixed portion and the inner fixed portion, the outer fixed portion is connected with the shell, and the rigid connecting member is arranged at the inner fixed portion. The second diaphragm assembly comprises a folding ring portion and a second vibration plate connected with each other, the outer periphery of the folding ring portion is connected with the shell, and the inner edge of the second vibration plate is connected with the inner edge of the diaphragm. The inner fixed portion is connected with the second vibration plate and the voice coil, and is electrically connected with the lead wire of the voice coil.

10. The sound production device of claim 9, wherein, The inner fixed portion comprises a body portion and a third extension portion extending from the body portion towards the voice coil, the body portion is connected with the second vibration plate, and the third extension portion is connected with the voice coil. The third extension portion or the body portion is provided with an inner pad electrically connected with the lead wire of the voice coil.

11. The sound production device of claim 10, wherein, The magnetic yoke corresponding to the inner fixed portion is provided with a relief structure, and the relief structure is a recessed groove or a through hole. Furthermore, the rigid connecting member comprises a rigid connecting portion and a fourth extension portion extending from the rigid connecting portion towards the voice coil, the rigid connecting portion is connected with the body portion, and the fourth extension portion is connected with the third extension portion correspondingly. Furthermore, the rigid connecting member is arranged on the side of the inner fixed portion away from the second diaphragm assembly. And / or, the outer fixing part is annularly arranged, and has alternating short-axis sides and long-axis sides, the vibration arm is led out from one side of the short-axis side corresponding to the inner fixing part, and extends along the long-axis side after being bent, and the vibration arm is connected to a central region of the long-axis side; And / or, the centering support sheet further comprises a conductive part, one end of the conductive part is connected to the outer fixing part, the other end of the conductive part extends away from the shell, and an external bonding pad is arranged.

12. The sound production device of claim 1, wherein, The shell comprises a first shell and a second shell, the first shell is provided with the sound outlet 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.

13. The sound production device of claim 12, wherein, The first shell has a side wall and an inner bending 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 outer periphery of the diaphragm are connected to the inner bending part, and the outer periphery of the second diaphragm assembly is clamped between one end of the side wall away from the inner bending part and the second shell. The sound outlet hole is arranged on the side wall or the inner bending part.

14. The sound production device of claim 13, wherein, The inner bending part comprises 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 one end of the inner bending 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.

15. The sound production device of claim 12, wherein, The first shell is a metal shell, and the second shell is a metal shell. The first shell is provided with a welding part extending towards the magnetic yoke, the welding part is welded to the magnetic yoke or the second shell; and / or the magnetic yoke or the second shell is provided with a welding part extending towards the first shell, the welding part 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. And / or, the second shell and the magnetic yoke are integrally formed. And / or, the vibration system further comprises a centering support sheet, the centering support sheet comprises an outer fixing part, an inner fixing part and a vibration arm connecting the outer fixing part and the inner fixing part, the outer fixing part is clamped between the second shell and the outer periphery of the second diaphragm assembly, the rigid connecting piece is arranged on the inner fixing part, the inner fixing part is connected to the voice coil and electrically connected to the lead wire of the voice coil.

16. The sound production device of any one of claims 1 to 15, wherein, The edge magnetic part comprises an edge magnet and an edge magnetic plate stacked, the edge magnet is connected to the magnetic yoke, the edge magnetic plate is arranged opposite to the center magnetic plate, and the magnetization direction of the edge magnet is opposite to that of the first center magnet.

17. A sound production module, comprising: The sound generating module comprises: A module housing is provided with a mounting cavity and a sound outlet communicating with the mounting cavity; and The sound production device as claimed in any one of claims 1 to 16 is arranged in the mounting cavity, a front sound cavity is formed between a first diaphragm assembly of the sound production device and the module housing, 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 housing 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 a sound outlet hole of the sound production device directly communicates with the sound outlet.

18. An electronic device, comprising: The electronic device comprises the sound production device as claimed in any one of claims 1 to 16; Or, the electronic device comprises the sound production module as claimed in claim 17.

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