Sound production device and electronic equipment

Abstract

The utility model discloses a sounding device and an electronic device, and relates to the technical field of electroacoustic transduction, the sounding device comprises a magnetic circuit system, a first vibration system, a second vibration system and a support member, two sides of the magnetic circuit system arranged back to back are respectively provided with a first magnetic gap and a second magnetic gap; the first vibration system comprises a first diaphragm assembly and a first voice coil assembly arranged corresponding to the first magnetic gap. The second vibration system comprises a second vibrating diaphragm assembly and a second voice coil assembly arranged corresponding to the second magnetic gap, and the number of voice coils of the first voice coil assembly is not greater than the number of voice coils of the second voice coil assembly; the supporting piece is provided with an auxiliary magnetic circuit assembly located on one side of the first vibrating diaphragm assembly, the auxiliary magnetic circuit assembly comprises a plurality of sub-magnets forming a Halbach array, and the magnetic field reinforcing side of the auxiliary magnetic circuit assembly is located on the side, close to the first vibrating diaphragm assembly, of the auxiliary magnetic circuit assembly. According to the technical scheme of the utility model, on the premise that the BL value requirement of a product is met, the thin design of the sound production device is realized, and the light and thin design requirement of the product is met.

Description

Technical Field

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

[0002] In recent years, consumer electronic products such as mobile phones and VR devices have developed rapidly. The sound device is an important electroacoustic transducer component in consumer electronic products, and is widely used as speakers, receivers, headphones, etc. As users have higher and higher requirements for the privacy and private calls of electronic products, electronic products using DPS speakers as sound devices are becoming more and more popular. DPS speakers use a double-sided sound method, which can effectively reduce the sound leakage of the product, improve the effectiveness of private calls, and maintain a high level of stereo external sound, with good product performance.

[0003] In the related art, as the requirements for electronic products to be thinner and lighter increase, the assembly space for installing sound-generating devices in electronic products is getting smaller and smaller. In order to meet the installation requirements in a small space, the thickness of the sound-generating device is reduced by thinning the magnet of the sound-generating device and reducing the height of the voice coil. However, this setting method will also weaken the magnetic induction intensity of the speaker and reduce the magnetic energy product of the product, thereby reducing the BL value of the product and reducing the product performance. Utility Model Content

[0004] The main purpose of the utility model is to propose a sound-generating device and an electronic device, which aims to increase the residual magnetization intensity of the sound-generating device and the BL value of the sound-generating device by setting an auxiliary magnetic circuit component with a Halbach magnetic circuit; to ensure that the double-sided vibration performance of the sound-generating device is equivalent, thereby achieving the demand for lightweight design of the product.

[0005] In order to achieve the above-mentioned purpose, the sound-generating device proposed by the utility model comprises:

[0006] A magnetic circuit system, wherein two sides of the magnetic circuit system facing each other are respectively provided with a first magnetic gap and a second magnetic gap;

[0007] A first vibration system, the first vibration system comprising a first diaphragm assembly and a first voice coil assembly connected to the first diaphragm assembly, the first voice coil assembly being arranged corresponding to the first magnetic gap;

[0008] a second vibration system, arranged on a side of the magnetic circuit system away from the first vibration system, the second vibration system comprising a second diaphragm assembly and a second voice coil assembly connected to the second diaphragm assembly, the second voice coil assembly being arranged corresponding to the second magnetic gap, and the number of voice coils of the first voice coil assembly being no more than the number of voice coils of the second voice coil assembly; and

[0009] A support member is provided with an auxiliary magnetic circuit component located on the side of the first diaphragm assembly facing away from the magnetic circuit system, the auxiliary magnetic circuit component forms an auxiliary magnetic field acting on the first voice coil assembly, the auxiliary magnetic circuit component includes a plurality of sub-magnets forming a Halbach array, and the magnetic field strengthening side of the auxiliary magnetic circuit component is located on its side close to the first diaphragm assembly.

[0010] In one embodiment, the first vibration system and the second vibration system both vibrate along a first direction, and the plurality of sub-magnets are arranged in sequence along a second direction perpendicular to the first direction;

[0011] The plurality of sub-magnets include a first magnet, a second magnet and a third magnet arranged in sequence along the second direction, the first magnet and the third magnet are magnetized along the first direction and in opposite directions, and the second magnet is magnetized along the second direction toward a direction close to the first magnet;

[0012] Or, the plurality of sub-magnets include a first magnet, a second magnet and a third magnet arranged in sequence along the second direction, the first magnet and the third magnet are magnetized along the second direction toward a direction close to the second magnet and the magnetization directions are opposite, and the second magnet is magnetized along the first direction toward a direction close to the first diaphragm assembly;

[0013] Or, the plurality of sub-magnets include a first magnet, a second magnet, a third magnet, a fourth magnet and a fifth magnet arranged in sequence along the second direction, the first magnet, the third magnet and the fifth magnet are all magnetized along the first direction, the first magnet and the fifth magnet have the same magnetizing direction and are opposite to the magnetizing direction of the third magnet, the third magnet is magnetized along the first direction toward a direction away from the first diaphragm assembly, and the second magnet and the fourth magnet are both magnetized along the second direction toward a direction away from the third magnet and have opposite magnetizing directions.

[0014] In one embodiment, the auxiliary magnetic circuit assembly includes two groups of Halbach arrays composed of a plurality of sub-magnets, and the two groups of Halbach arrays are located on opposite sides of the first voice coil assembly;

[0015] Alternatively, the first voice coil assembly has a plurality of connecting edges connected end to end, the auxiliary magnetic circuit assembly includes a plurality of Halbach arrays composed of a plurality of the sub-magnets, and the plurality of Halbach arrays are arranged in one-to-one correspondence with the plurality of connecting edges.

[0016] In one embodiment, the number of voice coils in the first voice coil assembly is the same as the number of voice coils in the second voice coil assembly; or,

[0017] The number of voice coils in the first voice coil assembly is less than the number of voice coils in the second voice coil assembly.

[0018] In one embodiment, the first vibration system and the second vibration system both vibrate along a first direction, the first voice coil assembly and the second voice coil assembly are respectively provided with a voice coil, and along the first direction, the extension height of the first voice coil assembly is less than the extension height of the second voice coil assembly;

[0019] And / or, the first voice coil assembly and the second voice coil assembly are each provided with a voice coil, and the voice coil wire length of the first voice coil assembly is less than the voice coil wire length of the second voice coil assembly.

[0020] In one embodiment, the magnetic circuit system comprises:

[0021] Center magnet;

[0022] an annular magnet, the annular magnet is disposed around the central magnet and is spaced apart from the central magnet to form the first magnetic gap; and

[0023] The side magnets are located at the peripheral side of the annular magnet and are spaced apart from the annular magnet to form the second magnetic gap.

[0024] In one embodiment, the magnetic circuit system further comprises:

[0025] A first central magnetic conductive member, wherein the central magnet is disposed on a side of the first central magnetic conductive member facing away from the first vibration system; and

[0026] A first side magnetic conductive member is arranged around the first central magnetic conductive member, the first side magnetic conductive member is arranged at a distance from the first central magnetic conductive member, the annular magnet and the side magnet are arranged on a side of the first side magnetic conductive member facing away from the first vibration system, and the central magnet, the first central magnetic conductive member, the annular magnet and the first side magnetic conductive member jointly enclose the first magnetic gap;

[0027] Among them, a protrusion is provided on the side of the first side magnetic conductor facing the annular magnet, the contour of the protrusion is adapted to the contour of the annular magnet, the annular magnet is arranged on the protrusion, and the side magnet is arranged on the peripheral side of the protrusion and spaced apart from the protrusion.

[0028] In one embodiment, the first voice coil assembly is provided with a first voice coil, and the second voice coil assembly is provided with a second voice coil and a third voice coil located inside the second voice coil;

[0029] The second magnetic gap includes a first gap and a second gap, the first gap is located outside the second gap, the second voice coil is arranged corresponding to the first gap, and the third voice coil is arranged corresponding to the second gap.

[0030] In one embodiment, the magnetic circuit system comprises:

[0031] A central magnet, wherein the central magnet is provided with a through hole;

[0032] an annular magnet, the annular magnet is arranged around the central magnet and is spaced apart from the central magnet to form the first magnetic gap;

[0033] a side magnet, the side magnet being located at a peripheral side of the annular magnet and spaced apart from the annular magnet to form the first gap; and

[0034] The first central magnetic conductive member includes a lower protrusion and an annular portion connected to one end of the lower protrusion, the lower protrusion is located in the through hole and is spaced apart from the edge of the through hole to form the second gap, and the annular portion is arranged on the side of the central magnet facing the first diaphragm assembly.

[0035] In one embodiment, the first diaphragm assembly includes a first diaphragm and a first reinforcement member provided on the first diaphragm;

[0036] Wherein, a first connecting portion is protruded on a surface of the first reinforcing member facing the first voice coil assembly, and the first connecting portion is connected to one end of the first voice coil assembly;

[0037] And / or, a recessed portion is provided on a side of the first reinforcing member facing the auxiliary magnetic circuit component, and the auxiliary magnetic circuit component is arranged corresponding to the recessed portion.

[0038] In one embodiment, the second diaphragm assembly includes a second diaphragm and a second reinforcement member arranged on the second diaphragm, and a second connecting portion is provided on a side of the second reinforcement member facing the second voice coil assembly, and the second connecting portion is connected to one end of the second voice coil assembly.

[0039] In one embodiment, the sound generating device further comprises a first connecting bracket disposed between the first diaphragm assembly and the magnetic circuit system, wherein the first connecting bracket is disposed around the circumference of the first diaphragm assembly and is respectively connected to the first diaphragm assembly and the magnetic circuit system;

[0040] And / or, the sound-generating device further comprises a second connecting bracket arranged between the second diaphragm assembly and the magnetic circuit system, the second connecting bracket being arranged around the circumference of the second diaphragm assembly and being connected to the second diaphragm assembly and the magnetic circuit system respectively.

[0041] In one embodiment, the sound-generating device further includes a front cover, which is disposed on a side of the first diaphragm assembly facing away from the magnetic circuit system and forms the support member, the periphery of the front cover is connected to the periphery of the first diaphragm assembly, a vibration space is formed between the front cover and the diaphragm assembly, and the auxiliary magnetic circuit assembly is disposed on the front cover.

[0042] In one embodiment, the sound-generating device further comprises a module upper shell and a module lower shell covering each other, the module upper shell and the module lower shell enclose an installation space, and the magnetic circuit system, the first vibration system and the second vibration system are arranged in the installation space;

[0043] At least a portion of the module upper shell is located on the side of the diaphragm assembly facing away from the magnetic circuit system, the module upper shell forms the support member, and the auxiliary magnetic circuit assembly is arranged on the module upper shell.

[0044] The utility model also provides an electronic device, which includes the sound-generating device as described in any of the above embodiments.

[0045] The technical solution of the utility model is to respectively arrange the first vibration system and the second vibration system on both sides of the magnetic circuit system to achieve the effect of double-sided diaphragm vibration and sound generation; wherein, the number of voice coils in the first vibration system does not exceed the number of voice coils in the second vibration system, so that the number of voice coils in the first vibration system can be the same as or less than the number of voice coils in the second vibration system, and at the same time, an auxiliary magnetic circuit component is arranged on the side of the first vibration system facing away from the magnetic circuit system, so that the first voice coil component can be affected by the magnetic circuit system and the auxiliary magnetic circuit component, increase the residual magnetization intensity on one side of the first vibration system, so as to increase the magnetic induction intensity of the sound-generating device, and increase the magnetic energy product on one side of the first vibration system, thereby, on the premise of meeting the BL value requirements of the product, the magnetic circuit system can be thinned or the height of the first voice coil component can be lowered, thereby realizing the thin design of the sound-generating device. In addition, the above design can also reduce the BL difference between the first vibration system and the second vibration system on both sides of the magnetic circuit system, so that the performance difference between the first vibration system and the second vibration system is small, effectively reduce the sound leakage of the product, and improve the effectiveness of private calls.

[0046] The auxiliary magnetic circuit component is composed of multiple sub-magnets to form a Halbach array magnet structure, and the side of the auxiliary magnetic circuit component facing the first vibration system is its magnetic field strengthening side; such an arrangement more effectively improves the magnetic energy product of the sound-generating device, thereby improving the sensitivity of the sound-generating device and effectively improving product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0048] Figure 1 A cross-sectional view of a first embodiment of a sound-generating device provided by the utility model;

[0049] Figure 2 An exploded view of a second embodiment of the sound-generating device provided by the utility model;

[0050] Figure 3 A cross-sectional view of a third embodiment of the sound-generating device provided by the utility model;

[0051] Figure 4 A cross-sectional view of a fourth embodiment of the sound-generating device provided by the utility model;

[0052] Figure 5 A cross-sectional view of a fifth embodiment of the sound-generating device provided by the utility model;

[0053] Figure 6 An exploded view of a sixth embodiment of the sound-generating device provided by the utility model;

[0054] Figure 7 A cross-sectional view of a seventh embodiment of the sound-generating device provided by the utility model;

[0055] Figure 8 A cross-sectional view of an eighth embodiment of the sound-generating device provided by the utility model;

[0056] Fig. 9 A schematic diagram of an embodiment of a Halbach array formed by an auxiliary magnetic circuit component in a sound-generating device of the utility model;

[0057] Fig.10 A schematic diagram of another embodiment of a Halbach array formed by an auxiliary magnetic circuit component in the sound-generating device of the utility model;

[0058] Fig.11 It is a schematic diagram of another embodiment of a Halbach array formed by the auxiliary magnetic circuit components in the sound-generating device of the utility model.

[0059] Description of Figure Numbers:

[0060] 100, sound-generating device; 10, magnetic circuit system; 11, center magnet; 111, through hole; 12, annular magnet; 13, side magnet; 14, first center magnetic conductive member; 141, lower convex portion; 142, annular portion; 15, first side magnetic conductive member; 151, convex portion; 16, second center magnetic conductive member; 17, second side magnetic conductive member; 11a, first magnetic gap; 12a, second magnetic gap; 121a, first gap; 122a, second gap; 20, first vibration system; 21, first diaphragm assembly; 211, first diaphragm; 2111, first inner ring hole; 212, first reinforcement member; 2121, first connecting portion; 2122, recessed portion; 22, first voice coil assembly; 221, first voice coil; 3 0. Second vibration system; 31. Second diaphragm assembly; 311. Second diaphragm; 3111. Second inner ring hole; 312. Second reinforcement; 3121. Second connecting part; 32. Second voice coil assembly; 321. Second voice coil; 322. Third voice coil; 40. Auxiliary magnetic circuit assembly; 41. Sub-magnet; 411. First magnet; 412. Second magnet; 413. Third magnet; 414. Fourth magnet; 415. Fifth magnet; 50. Support member; 51. Front cover; 511. Vibration space; 52. Module shell; 521. Module upper shell; 522. Module lower shell; 523. Installation space; 524. Front sound cavity; 525. Sound outlet; 60. First connecting bracket; 70. Second connecting bracket.

[0061] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0063] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0064] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0065] The present invention provides a sound-generating device 100, which can be applied to electronic devices, such as, but not limited to, smart watches, smart glasses, head-mounted display devices, mobile phones, speakers, computers, headphones, or televisions.

[0066] See also Figure 1 In one embodiment of the utility model, the sound-generating device 100 includes a magnetic circuit system 10, a first vibration system 20, a second vibration system 30 and a support member 50. The two sides of the magnetic circuit system 10 that are arranged opposite to each other are respectively provided with a first magnetic gap 11a and a second magnetic gap 12a; the first vibration system 20 includes a first diaphragm assembly 21 and a first voice coil assembly 22 connected to the first diaphragm assembly 21, and the first voice coil assembly 22 is arranged corresponding to the first magnetic gap 11a; the second vibration system 30 is arranged on the side of the magnetic circuit system 10 that is away from the first vibration system 20, and the second vibration system 30 includes a second diaphragm assembly 3 1 and a second voice coil assembly 32 connected to the second diaphragm assembly 31, the second voice coil assembly 32 is arranged corresponding to the second magnetic gap 12a, the number of voice coils of the first voice coil assembly 22 is not more than the number of voice coils of the second voice coil assembly 32; the support member 50 is provided with an auxiliary magnetic circuit assembly 40 located on the side of the first diaphragm assembly 21 facing away from the magnetic circuit system 10, the auxiliary magnetic circuit assembly 40 forms an auxiliary magnetic field acting on the first voice coil assembly 22, the auxiliary magnetic circuit assembly 40 includes a plurality of sub-magnets 41 forming a Halbach array, and the magnetic field strengthening side of the auxiliary magnetic circuit assembly 40 is located on its side close to the first diaphragm assembly 21.

[0067] In the embodiment of the utility model, the sound-emitting device 100 can be a sound-emitting unit, and the sound-emitting device 100 can be used as a loudspeaker, and a sound cavity can be formed by combining with the shell or other components of the electronic device; the sound-emitting device 100 can also be a sound-emitting module structure, for example, a module shell 52 is provided to accommodate other components of the sound-emitting device 100 and form a sound cavity, so that the sound-emitting device 100 can be used alone as a sound-emitting device.

[0068] The sound-generating device 100 includes a magnetic circuit system 10 and a first vibration system 20 and a second vibration system 30 respectively arranged on the opposite sides of the magnetic circuit system 10; the first vibration system 20 and the second vibration system 30 can both vibrate along a first direction, and optionally, the first direction is the arrangement direction of the first vibration system 20, the magnetic circuit system 10 and the second vibration system 30. When the sound-generating device 100 is used, the vibration directions of the first vibration system 20 and the second vibration system 30 can be the same or opposite. For example, in a call mode or other use mode that needs to reduce sound leakage and improve privacy, the first vibration system 20 and the second vibration system 30 can be vibrated in the same direction to generate sound waves with opposite phases, and the sound waves with opposite phases cancel each other out in the far field, thereby reducing sound leakage; in a use mode that needs to increase the playback volume, such as an external speaker mode, the first vibration system 20 and the second vibration system 30 can be vibrated in opposite directions to generate sound waves with the same phase, and the sound field superposition can be used to enhance the stereo effect.

[0069] A first magnetic gap 11a is provided on the side of the magnetic circuit system 10 facing the first vibration system 20. The first magnetic gap 11a is provided corresponding to the first voice coil assembly 22 of the first vibration system 20. The first voice coil assembly 22 can be inserted into the first magnetic gap 11a close to one end of the magnetic circuit system 10, or the first voice coil assembly 22 can be located outside the first magnetic gap 11a. The first voice coil assembly 22 includes at least one voice coil connected to the first diaphragm assembly 21, and the first magnetic gap 11a may include at least one sub-gap. The number of sub-gaps included in the first magnetic gap 11a is the same as the number of voice coils in the first voice coil assembly 22, and each voice coil corresponds to a sub-gap. For example, the first voice coil assembly 22 includes one voice coil, and the first magnetic gap 11a may include only one sub-gap corresponding to the voice coil. When the first voice coil assembly 22 is provided with two or more voice coils, each voice coil is arranged in sequence from inside to outside on the surface of the first diaphragm assembly 21 facing the magnetic circuit system 10, and the first magnetic gap 11a may be provided with the same number of sub-gaps as the number of voice coils in the first voice coil assembly 22, and each voice coil of the first voice coil assembly 22 corresponds to each sub-gap of the first magnetic gap 11a. Optionally, each voice coil in the first voice coil assembly 22 may be a square voice coil, which may be set to a square, circular, elliptical or other shape, and the shape of each sub-gap in the first magnetic gap 11a is the same as the shape of the corresponding voice coil.

[0070] A second magnetic gap 12a is provided on the side of the magnetic circuit system 10 facing the second vibration system 30. The second magnetic gap 12a is provided corresponding to the second voice coil assembly 32 of the second vibration system 30. The second voice coil assembly 32 can be inserted into the second magnetic gap 12a close to one end of the magnetic circuit system 10, or the second voice coil assembly 32 can be located outside the second magnetic gap 12a. The second voice coil assembly 32 includes at least one voice coil connected to the second diaphragm assembly 31, and the second magnetic gap 12a may include at least one sub-gap. The number of sub-gaps included in the second magnetic gap 12a is the same as the number of voice coils in the second voice coil assembly 32, and each voice coil corresponds to a sub-gap. For example, the second voice coil assembly 32 includes one voice coil, and the second magnetic gap 12a may include only one sub-gap corresponding to the voice coil. When the second voice coil assembly 32 is provided with two or more voice coils, each voice coil is arranged sequentially from inside to outside on the surface of the second diaphragm assembly 31 facing the magnetic circuit system 10, and the second magnetic gap 12a may be provided with the same number of sub-gaps as the number of voice coils in the second voice coil assembly 32, and each voice coil of the second voice coil assembly 32 corresponds to each sub-gap of the second magnetic gap 12a. Optionally, each voice coil in the second voice coil assembly 32 may be a square voice coil, which may be set to a square, circular, elliptical or other shape, and the shape of each sub-gap in the second magnetic gap 12a is the same as the shape of the corresponding voice coil.

[0071] The magnetic circuit system 10 includes at least three magnetic circuit structures arranged in sequence from the inside to the outside, and a sub-gap is formed between two adjacent magnetic circuit structures, and the sub-gap can be used as a part of the first magnetic gap 11a or a part of the second magnetic gap 12a. In addition, each magnetic circuit structure can be set as a magnet, or part of it can be set as a magnetic conductive member. For example, taking the first voice coil assembly 22 and the second voice coil assembly 32 as an example, each of the first magnetic gap 11a and the second magnetic gap 12a can only have one sub-gap; at this time, the magnetic circuit system 10 can include a central magnetic conductive member, an annular magnetic member arranged around the central magnetic conductive member, and an edge magnetic member arranged outside the annular magnetic member. The gap between the central magnetic conductive member and the annular magnetic member is used as the first magnetic gap 11a, and the gap between the annular magnetic member and the edge magnetic member is used as the second magnetic gap 12a.

[0072] Optionally, in some embodiments, in order to achieve the installation of each magnetic circuit structure that forms a magnetic gap in the magnetic circuit system 10 and to reduce magnetic leakage, a magnetic conductive structure can be set in the magnetic circuit system 10 for transmitting magnetic flux lines and playing a magnetic gathering role, and the magnetic conductive structure can be used to connect two adjacent and spaced magnetic circuit structures; for example, taking the first voice coil assembly 22 and the second voice coil assembly 32 as an example in which a voice coil is respectively provided, a central magnet 11, an annular magnet 12 and a side magnet 13 are sequentially arranged from the inside to the outside in the magnetic circuit system 10, and the gap between the central magnet 11 and the annular magnet 12 is used as the first magnetic gap 11a, and the gap between the annular magnet 12 and the side magnet 13 is used as the second magnetic gap 12a, and a side magnetic conductive member can be arranged on the side of the magnetic circuit system 10 facing the first vibration system 20, and the side magnetic conductive member can be arranged on the side of the magnetic circuit system 10 facing the first vibration system 20. The magnetic parts are connected to the annular magnet 12 and the side magnet 13, respectively, such as the first side magnetic conductive part 15 in the embodiment below; a central magnetic conductive part is arranged on the side of the magnetic circuit system 10 facing the second vibration system 30, and the central magnetic conductive part is connected to the annular magnet 12 and the center magnet 11, respectively, such as the second central magnetic conductive part 16 in the embodiment below; this arrangement can make the center magnet 11, the annular magnet 12 and the side magnet 13 connected in sequence through the magnetic conductive structure to form an integral structure, which is easy to install; and the magnetic conductive part used to connect the annular magnet 12 and the side magnet 13 will not block the second magnetic gap 12a, and the magnetic conductive part used to connect the annular magnet 12 and the center magnet 11 will not block the first magnetic gap 11a, and will not affect the cooperation between the first voice coil assembly 22 and the second voice coil assembly 32 and the magnetic circuit system 10.

[0073] Optionally, the voice coil in the first voice coil assembly 22 and the voice coil in the second voice coil assembly 32 are staggered along the first direction on the plane where the magnetic circuit system 10 is located. This arrangement can also make the first magnetic gap 11a and the second magnetic gap 12a provided on the magnetic circuit system 10 staggered, thereby reducing the thickness of the magnetic circuit system 10 in the first direction. There is no need to make the magnetic circuit system 10 too thick to meet the depth requirements of the first magnetic gap 11a and the second magnetic gap 12a, so that the thickness of the sound-emitting device 100 in the first direction can be reduced, which is conducive to realizing a thin setting of the sound-emitting device 100, can better meet the use requirements of the sound-emitting device 100 in a small space, and improve applicability; it is also conducive to making the electronic device using the sound-emitting device 100 light and thin.

[0074] In the embodiment of the utility model, an auxiliary magnetic circuit component 40 is arranged on the side of the first vibration system 20 facing away from the magnetic circuit system 10. The auxiliary magnetic circuit component 40 can generate an auxiliary magnetic field and act on the first voice coil component 22, so that the first voice coil component 22 can drive the first diaphragm component 21 to vibrate under the action of the magnetic circuit system 10 and the auxiliary magnetic circuit component 40. This arrangement is to increase the magnetic field force acting on the first voice coil component 22 through the auxiliary magnetic circuit component 40, thereby increasing the magnetic induction intensity of the first voice coil component 22, increasing the residual magnetization intensity on one side of the first vibration system 20, increasing the magnetic energy product on one side of the first vibration system 20, increasing the BL value of the first vibration system 20, and thus increasing the sensitivity of the first vibration system 20. It can be understood that due to the increase in the magnetic field intensity acting on the first voice coil component 22, the magnetic circuit system 10 can be appropriately thinned or the height of the first voice coil component 22 can be appropriately reduced under the premise of meeting the use requirements, thereby realizing the thinning design of the sound-generating device 100 and meeting the light and thin design of the sound-generating device 100.

[0075] Moreover, in the present invention, the number of voice coils in the second voice coil assembly 32 can be the same as the number of voice coils in the first voice coil assembly 22, or can be more than the number of voice coils in the first voice coil assembly 22, so that the magnetic induction intensity between the second voice coil assembly 32 and the magnetic circuit system 10 is greater than the magnetic induction intensity between the first voice coil assembly 22 and the magnetic circuit system 10. With such an arrangement, when the first voice coil assembly 22 is simultaneously acted upon by the magnetic field of the auxiliary magnetic circuit assembly 40, the BL difference between the first vibration system 20 and the second vibration system 30 is smaller, so that when the first vibration system 20 and the second vibration system 30 generate anti-phase sound waves, a better far-field cancellation effect can be achieved, thereby reducing sound leakage.

[0076] The auxiliary magnetic circuit assembly 40 includes a plurality of sub-magnets 41, and the plurality of sub-magnets 41 can form at least one group of Halbach array magnet structures. The Halbach array magnet structure is formed by arranging the sub-magnets 41 with different magnetization directions according to a certain rule so that the magnetic lines of force converge on one side of the array, thereby forming a stronger magnetic field on that side, while being significantly weakened on the other side. This arrangement can generate a stronger magnetic field with a small number of magnets, thereby reducing the number of sub-magnets 41 in the auxiliary magnetic circuit system 10. The magnetic field strengthening side of the Halbach array is located on the side facing the first vibration system 20, thereby increasing the magnetic induction intensity between the auxiliary magnetic circuit assembly 40 and the first vibration system 20, increasing the magnetic energy product on one side of the first vibration system 20, and making the sensitivity of the first vibration system 20 higher.

[0077] In order to facilitate the installation of the auxiliary magnetic circuit assembly 40, the auxiliary magnetic circuit assembly 40 is arranged on the support member 50; optionally, the support member 50 can form an installation surface or an installation cavity for installing the auxiliary magnetic circuit system 10, so that the auxiliary magnetic circuit assembly 40 can be arranged on the surface of the support member 50 facing away from the first diaphragm assembly 21 or facing the first diaphragm assembly 21, or installed inside the support member 50. In some embodiments, the support member 50 can be set as a frame structure, or can be set as a plate or other structural form arranged opposite to the first diaphragm assembly 21. For example, the support member 50 can be set as a front cover 51 arranged opposite to the first diaphragm assembly 21 and connected to the edge of the first diaphragm assembly 21, or when the sound-generating device 100 is provided with a module shell 52, the module upper shell 521 arranged opposite to the first diaphragm assembly 21 in the module shell 52 can be used as the support member 50.

[0078] According to the technical solution of the utility model, a first vibration system 20 and a second vibration system 30 are respectively arranged on both sides of a magnetic circuit system 10 to achieve the effect of double-sided diaphragm vibration and sound generation; wherein, the number of voice coils in the first vibration system 20 does not exceed the number of voice coils in the second vibration system 30, so that the number of voice coils in the first vibration system 20 and the second vibration system 30 can be the same or less than the number of voice coils in the second vibration system 30, and at the same time, an auxiliary magnetic circuit component 40 is arranged on the side of the first vibration system 20 facing away from the magnetic circuit system 10, so that the first voice coil component 22 can be affected by the magnetic circuit system 10 and the auxiliary magnetic circuit component 40, thereby increasing the residual magnetization intensity on one side of the first vibration system 20, so as to improve the magnetic induction intensity of the sound-generating device 100, and increase the magnetic energy product on one side of the first vibration system 20, thereby, on the premise of meeting the BL value requirement of the product, the magnetic circuit system 10 can be thinned or the height of the first voice coil component 22 can be lowered, thereby realizing a thin design of the sound-generating device 100. In addition, the above design can also reduce the BL difference between the first vibration system 20 and the second vibration system 30 on both sides of the magnetic circuit system 10, so that the performance difference between the first vibration system 20 and the second vibration system 30 is smaller, effectively reducing the sound leakage of the product and improving the effectiveness of private calls.

[0079] The auxiliary magnetic circuit component 40 is composed of a plurality of sub-magnets 41 to form a Halbach array magnet structure, and the side of the auxiliary magnetic circuit component 40 facing the first vibration system 20 is its magnetic field strengthening side; such an arrangement more effectively improves the magnetic energy product of the sound-generating device 100, thereby improving the sensitivity of the sound-generating device 100 and effectively improving product performance.

[0080] In one embodiment, the auxiliary magnetic circuit component 40 is disposed on a side of the support member 50 facing the first diaphragm component 21; and / or, the auxiliary magnetic circuit component 40 is disposed on a side of the support member 50 away from the first diaphragm component 21; and / or, an installation cavity is provided in the support member 50, and the auxiliary magnetic circuit component 40 is disposed in the installation cavity.

[0081] In this embodiment, the support member 50 is arranged to be opposite to the first diaphragm assembly 21, and the auxiliary magnetic circuit assembly 40 can be arranged on the side of the support member 50 facing the first diaphragm assembly 21, or on the side of the support member 50 away from the first diaphragm assembly 21. The auxiliary magnetic circuit assembly 40 can also be arranged in the installation cavity formed on the inner side of the support member 50.

[0082] In some embodiments, at least two groups of Halbach array magnetic circuit structures can be arranged in the auxiliary magnetic circuit assembly 40; optionally, each group of Halbach array magnetic circuit structures can be arranged on the same side or in the installation cavity; at least two groups of Halbach arrays can also be arranged at different positions of the support 50, for example, one group of Halbach arrays is arranged on the side of the support 50 facing the first diaphragm assembly 21, and the other group of Halbach arrays is arranged on the side of the support 50 away from the first diaphragm assembly 21 or in the installation cavity; three or more groups of Halbach arrays can also be arranged, and three groups of Halbach arrays are respectively arranged on the side of the support 50 facing the first diaphragm assembly 21, the side of the support 50 away from the first diaphragm assembly 21 and in the installation cavity.

[0083] See also Figure 2 or Figure 6 In one embodiment, the first vibration system 20 and the second vibration system 30 both vibrate along a first direction (e.g., a vertical z direction), and a plurality of sub-magnets 41 are arranged in sequence along a second direction (e.g., a horizontal y direction) perpendicular to the first direction. Optionally, the second direction may be the same as the extension direction or tangent direction of the voice coil line, or may be perpendicular to the extension direction or tangent direction of the voice coil line. In an embodiment of the utility model, the number of sub-magnets 41 forming a group of Halbach arrays may be three, four, five or more. The number of sub-magnets 41 and the arrangement of the magnetization directions of each magnet are illustrated below.

[0084] Please refer to Fig. 9In one embodiment of the utility model, the plurality of sub-magnets 41 include a first magnet 411, a second magnet 412, and a third magnet 413 arranged in sequence along the second direction, the first magnet 411 and the third magnet 413 are magnetized along the first direction and in opposite directions, and the second magnet 412 is magnetized along the second direction toward the direction close to the first magnet 411. For example, the first direction may be a vertical z direction, the second direction may be a horizontal y direction, the first magnet 411 may be magnetized in a direction from top to bottom, the third magnet 413 may be magnetized in a direction from bottom to top, and the second magnet 412 may be magnetized in a horizontal direction from right to left.

[0085] In this configuration, the magnetic field strengthening side of the Halbach array is located on the side close to the first diaphragm assembly 21 , thereby increasing the magnetic field strength acting on the first voice coil assembly 22 .

[0086] Please refer to Fig.10 In one embodiment of the utility model, the plurality of sub-magnets 41 include a first magnet 411, a second magnet 412, and a third magnet 413 arranged in sequence along the second direction. The first magnet 411 and the third magnet 413 are magnetized along the second direction toward the direction close to the second magnet 412 and the magnetization directions are opposite. The second magnet 412 is magnetized along the first direction toward the direction close to the first diaphragm assembly 21. For example, the first direction may be a vertical z direction, the second direction may be a horizontal y direction, the first magnet 411 may be magnetized along a horizontal direction from left to right, the third magnet 413 may be magnetized along a horizontal direction from right to left, and the second magnet 412 may be magnetized along a direction from top to bottom.

[0087] In this configuration, the magnetic field strengthening side of the Halbach array is located on the side close to the first diaphragm assembly 21 , thereby increasing the magnetic field strength acting on the first voice coil assembly 22 .

[0088] Please refer to Fig.11In one embodiment, the plurality of sub-magnets 41 include a first magnet 411, a second magnet 412, a third magnet 413, a fourth magnet 414 and a fifth magnet 415 arranged in sequence along the second direction. The first magnet 411, the third magnet 413 and the fifth magnet 415 are all magnetized along the first direction. The magnetization directions of the first magnet 411 and the fifth magnet 415 are the same and opposite to the magnetization direction of the third magnet 413. The third magnet 413 is magnetized along the first direction toward a direction away from the first diaphragm assembly 21. The second magnet 412 and the fourth magnet 414 are both magnetized along the second direction toward a direction away from the third magnet 413 and the magnetization directions are opposite. For example, the first direction may be a vertical z direction, the second direction may be a horizontal y direction, the first magnet 411, the third magnet 413 and the fifth magnet 415 are all magnetized in the vertical direction, wherein the first magnet 411 and the fifth magnet 415 are both magnetized in a direction from top to bottom, the third magnet 413 is magnetized in a direction from bottom to top, the second magnet 412 and the fourth magnet 414 are both magnetized in a horizontal direction and in opposite directions, the second magnet 412 is magnetized in a horizontal direction from right to left, and the fourth magnet 414 is magnetized in a horizontal direction from left to right.

[0089] In this embodiment, five sub-magnets 41 are used to form a Halbach array. In this arrangement, the magnetic field strengthening side of the Halbach array is located on the side close to the first diaphragm assembly 21, thereby increasing the magnetic field strength acting on the first voice coil assembly 22.

[0090] It should be noted that the number and arrangement of the sub-magnets 41 forming the Halbach array in the auxiliary magnetic circuit assembly 40 are not limited to the aforementioned embodiment, and the number of the sub-magnets 41 can be appropriately increased or decreased according to factors such as the size of the sound-generating device 100 and the magnetic field strength of the Halbach magnetic circuit to be formed. Optionally, when at least two groups of Halbach arrays are provided in the auxiliary magnetic circuit assembly 40, the number and arrangement of the sub-magnets 41 in the two groups of Halbach arrays can be the same or different, and are not limited here.

[0091] Please refer to Figure 2 or Figure 6 In one embodiment, the auxiliary magnetic circuit assembly 40 includes two groups of Halbach arrays composed of a plurality of sub-magnets 41 , and the two groups of Halbach arrays are located on opposite sides of the first voice coil assembly 22 .

[0092] In the embodiment of the utility model, the first voice coil assembly 22 is defined as having two sides spaced apart in a third direction perpendicular to the first direction. In the embodiment, the auxiliary magnetic circuit assembly 40 is provided with two groups of Halbach arrays, and the two groups of Halbach arrays are respectively arranged corresponding to the two sides of the first voice coil assembly 22 along the third direction. Such an arrangement can increase the magnetic field strength generated by the auxiliary magnetic circuit assembly 40, and make the magnetic field strengths on both sides of the first voice coil assembly 22 the same or substantially the same, so that the magnetic field force on the first vibration system 20 is more uniform, avoiding polarization. Optionally, the third direction can be the same as the second direction in which the multiple sub-magnets 41 in the Halbach array are arranged, or can be perpendicular to the second direction, which is not limited here.

[0093] In one embodiment, the first voice coil assembly 22 has a plurality of connecting edges connected end to end, and the auxiliary magnetic circuit assembly 40 includes a plurality of Halbach arrays composed of a plurality of sub-magnets 41, and the plurality of Halbach arrays are arranged one-to-one correspondingly to the plurality of connecting edges.

[0094] In this embodiment, a plurality of groups of Halbach array magnetic circuit structures are arranged in the auxiliary magnetic circuit assembly 40, and each group of Halbach arrays is arranged corresponding to one side connection edge of the voice coil in the first voice coil assembly 22; for example, the voice coil in the first voice coil assembly 22 can be arranged in a square shape, and four groups of Halbach array magnetic circuit structures are arranged to correspond to the four connection edges of the square voice coil. This arrangement increases the magnetic field strength generated by the auxiliary magnetic circuit assembly 40, can improve the magnetic induction strength of the first voice coil assembly 22, improve the sensitivity of the first vibration system 20, and can also make the magnetic field strengths of the various connection edges of the first voice coil assembly 22 the same or approximately the same, so that the magnetic field force at various locations of the first voice coil assembly 22 is relatively uniform, which can avoid polarization problems and improve performance.

[0095] Please refer to Figures 1 to 4 In one embodiment, the number of voice coils in the first voice coil assembly 22 is the same as the number of voice coils in the second voice coil assembly 32 .

[0096] In this embodiment, the number of voice coils provided in the first voice coil assembly 22 and the second voice coil assembly 32 is the same, for example, one voice coil, two voice coils or other numbers can be provided respectively. Among them, the voice coil wire length of the first voice coil assembly 22 can be made smaller than the voice coil wire length of the second voice coil assembly 32, for example, the height of the second voice coil assembly 32 in the first direction can be made greater than the height of the first voice coil assembly 22, thereby, although the L value of the second voice coil assembly 32 is greater than the L value of the first voice coil assembly 22, the auxiliary magnetic circuit assembly 40 can increase the magnetic field strength value (B value) acting on the first voice coil assembly 22, thereby ensuring that the BL values ​​of the first vibration system 20 and the second vibration system 30 are basically consistent, and because the height of the first voice coil assembly 22 is relatively small, the magnetic circuit system 10 can be appropriately designed to be thin, thereby meeting the requirements of the light and thin design of the sound-generating device 100.

[0097] Please refer to Figures 5 to 8 In one embodiment, the number of voice coils in the first voice coil assembly 22 is less than the number of voice coils in the second voice coil assembly 32 .

[0098] In this embodiment, the number of voice coils of the first voice coil assembly 22 can be set to one, two or more, and the number of voice coils of the second voice coil assembly 32 can be set to two, three or other numbers. It is only necessary to make the number of voice coils of the second voice coil assembly 32 greater than the number of voice coils of the first voice coil assembly 22. For example, the first voice coil assembly 22 is provided with one voice coil, and the second voice coil assembly 32 can be provided with two, three or more voice coils; or the first voice coil assembly 22 is provided with two voice coils, and the second voice coil assembly 32 can be provided with three or more voice coils. This setting method is to increase the number of voice coils of the second voice coil assembly 32, increase the voice coil line length of the second voice coil assembly 32, and increase BL, thereby improving the sensitivity of the second vibration system 30. At the same time, the auxiliary magnetic circuit system 10 is provided on one side of the first vibration system 20, and the BL can also be increased, so that the BL size of both sides is equal, so that the performance difference of both sides is small, and the sound leakage of the product is effectively reduced.

[0099] In one embodiment, the first vibration system 20 and the second vibration system 30 both vibrate along a first direction, the first voice coil assembly 22 and the second voice coil assembly 32 are respectively provided with a voice coil, and along the first direction, the extension height of the first voice coil assembly 22 is less than the extension height of the second voice coil assembly 32.

[0100] In this embodiment, the extension height of the voice coil in the first voice coil assembly 22 in the vibration direction, i.e., the first direction, is smaller than the height of the second voice coil assembly 32, so that the voice coil wire length of the second voice coil assembly 32 can be larger than the voice coil wire length of the first voice coil assembly 22, thereby making the BL sizes of both sides equal. Moreover, since the extension height of the first voice coil assembly 22 is smaller than the extension height of the second voice coil assembly 32, the magnetic circuit system 10 can be designed to be thinner, thereby realizing a thin design of the sound generating device 100.

[0101] Please refer to Figures 1 to 4 In one embodiment, the first voice coil assembly 22 and the second voice coil assembly 32 are respectively provided with a voice coil, and the voice coil wire length of the first voice coil assembly 22 is less than the voice coil wire length of the second voice coil assembly 32.

[0102] In this embodiment, the voice coil line length of a single voice coil provided in the first voice coil assembly 22 is smaller than the voice coil line length of a single voice coil provided in the second voice coil assembly 32. For example, the outline size of the voice coil in the first voice coil assembly 22 can be smaller than the outline size of the voice coil in the second voice coil assembly 32, and the extension height of the voice coil of the second voice coil assembly 32 in the first direction can also be greater than the height of the voice coil in the first voice coil assembly 22. It can be understood that, since the auxiliary magnetic circuit assembly 40 can increase the magnetic field strength acting on the first voice coil assembly 22, such a configuration can make the magnetic induction strength of the first voice coil assembly 22 the same or substantially the same as the magnetic induction strength of the second voice coil assembly 32, thereby reducing the double-sided BL difference, and also realizing a thin design of the sound generating device 100.

[0103] Combined with reference Figure 1 and Figure 2 In one embodiment, the magnetic circuit system 10 includes a central magnet 11, an annular magnet 12 and a side magnet 13. The annular magnet 12 is arranged around the central magnet 11 and is spaced apart from the central magnet 11 to form a first magnetic gap 11a; the side magnet 13 is located on the peripheral side of the annular magnet 12 and is spaced apart from the annular magnet 12 to form a second magnetic gap 12a.

[0104] In this embodiment, the magnetic circuit system 10 includes a central magnet 11, an annular magnet 12 arranged around the central magnet 11, and a side magnet 13 located on the side of the annular magnet 12, wherein the annular magnet 12 may be an integrated closed loop structure, or a closed loop or open loop structure formed by a plurality of magnets arranged in a circumferential array along the central magnet 11; the side magnet 13 may be a closed loop structure arranged around the annular magnet 12, or a plurality of magnets arranged in a circumferential array along the annular magnet 12, for example, when the annular magnet 12 has a square profile, four magnets are arranged corresponding to the four sides of the annular magnet 12 as the side magnets 13. The central magnet 11 and the annular magnet 12 are spaced apart to form a first magnetic gap 11a corresponding to the first voice coil assembly 22, and the annular magnet 12 and the side magnet 13 are spaced apart to form a second magnetic gap 12a corresponding to the second voice coil assembly 32.

[0105] Optionally, the magnetic circuit system 10 can be set in a square shape, for example, the outer contours of the central magnet 11, the annular magnet 12 and the side magnet 13 are all square; the magnetic circuit system 10 can also be set in a circular, elliptical or other shape, so that the contours of the first magnetic gap 11a or the second magnetic gap 12a formed are respectively adapted to the first voice coil assembly 22 and the second voice coil assembly 32. In some embodiments, the inner contour and the outer contour of the annular magnet 12 can also be different. For example, the contour of the first voice coil assembly 22 is circular and the contour of the second voice coil assembly 32 is square. The central magnet 11 can be set in a circular shape, the annular magnet 12 can be set in an inner circular and outer square structure, and the inner contour of the side magnet 13 can be square, so that the first magnetic gap 11a formed is a circular gap adapted to the first voice coil assembly 22, and the second magnetic gap 12a formed is a square gap adapted to the second voice coil assembly 32. The shapes of the first voice coil assembly 22, the second voice coil assembly 32 and the magnetic circuit system 10 can be adjusted according to different shapes and performance requirements, which will not be described one by one here.

[0106] Combined with reference Figure 1 and Figure 2 In one embodiment, the magnetic circuit system 10 also includes a first central magnetic conductive member 14 and a first side magnetic conductive member 15, and the central magnet 11 is arranged on the side of the first central magnetic conductive member 14 facing away from the first vibration system 20; the first side magnetic conductive member 15 is arranged around the first central magnetic conductive member 14, and the annular magnet 12 and the side magnet 13 are arranged on the side of the first side magnetic conductive member 15 facing away from the first vibration system 20, and the central magnet 11, the first central magnetic conductive member 14, the annular magnet 12 and the first side magnetic conductive member 16 together enclose a first magnetic gap 11a.

[0107] In this embodiment, a first central magnetic conductive member 14 and a first side magnetic conductive member 15 are provided in the magnetic circuit system 10. The first central magnetic conductive member 14 is provided on the side of the central magnet 11 facing the first vibration system 20, and the first side magnetic conductive member 15 is provided around the first central magnetic conductive member 14, and is connected to one end of the annular magnet 12 and the side magnet 13 facing the first vibration system 20. Such an arrangement can concentrate the magnetic flux lines of the central magnet 11, the annular magnet 12 and the side magnet 13 facing the first vibration system 20, so that the magnetic field lines of the magnetic circuit system 10 on the side of the first voice coil assembly 22 are concentrated, thereby reducing leakage flux and improving the magnetic field strength.

[0108] The first side magnetic conductive member 15 is spaced apart from the first center magnetic conductive member 14, so that the combination structure of the center magnet 11 and the first center magnetic conductive member 14 and the combination structure of the annular magnet 12 and the first side magnetic conductive member 15 are spaced apart to form a first magnetic gap 11a. Due to the magnetic focusing effect of the first center magnetic conductive member 14 and the first side magnetic conductive member 15, the magnetic flux lines in the first magnetic gap 11a can be made denser, so that the magnetic field strength acting on the first voice coil assembly 22 is increased, so that the magnetic circuit system 10 can be appropriately thinned or the height of the first voice coil assembly 22 can be appropriately reduced under the premise of meeting the use requirements, so that the thinning design of the sound-generating device 100 can be realized, and the light and thin design of the sound-generating device 100 can be met.

[0109] In this embodiment, the annular magnet 12 and the edge magnet 13 are connected to each other through the first edge magnetic conductive member 15. The annular magnet 12 can be suspended between the first vibration system 20 and the second vibration system 30 by fixing the edge magnet 13 or the first edge magnetic conductive member 15 at the edge, making the installation of the annular magnet 12 more convenient.

[0110] Please refer to Figure 1 In some embodiments, a protrusion 151 is provided on the side of the first side magnetic conductor 15 facing the annular magnet 12, the contour of the protrusion 151 is adapted to the contour of the annular magnet 12, the annular magnet 12 is arranged on the protrusion 151, and the side magnet 13 is arranged on the side around the protrusion 151 and is spaced apart from the protrusion 151.

[0111] In this embodiment, the depth of the second magnetic gap 12a can be increased by setting the protrusion 151, so as to prevent the second voice coil assembly 32 from colliding with the second side magnetic conductive member 17 when it moves toward the side of the magnetic circuit system 10. The protrusion 151 can be formed by making the middle area of ​​the first side magnetic conductive member 15 as a whole concave in the direction away from the first vibration system 20, and correspondingly forming a concave structure on the side of the first side magnetic conductive member 15 facing the first side magnetic conductive member 15, and the concave structure can be used to avoid the first vibration system 20 and increase the vibration space 511 of the first vibration system 20. In some embodiments, the protrusion 151 can also be only a protrusion structure formed on the surface of the first side magnetic conductive member 15 facing the annular magnet 12, so that the surface of the first side magnetic conductive member 15 facing the first vibration system 20 is a plane.

[0112] Combined with reference Figure 1 and Figure 2 In some embodiments, the magnetic circuit system 10 further includes a second central magnetic conductive member 16 and a second side magnetic conductive member 17, the central magnet 11 and the annular magnet 12 are arranged on the side of the second central magnetic conductive member 16 facing away from the second vibration system 30; the second side magnetic conductive member 17 is arranged around the second central magnetic conductive member 16, the second side magnetic conductive member 17 is spaced apart from the second central magnetic conductive member 16, and the side magnet 13 is arranged on the side of the second side magnetic conductive member 17 facing away from the second vibration system 30; the annular magnet 12, the second central magnetic conductive member 16, the side magnet 13 and the second side magnetic conductive member 17 together enclose a second magnetic gap 12a.

[0113] In this embodiment, a second central magnetic conductive member 16 and a second side magnetic conductive member 17 are provided in the magnetic circuit system 10. The second central magnetic conductive member 16 is provided on the side of the central magnet 11 facing the second vibration system 30, and the second side magnetic conductive member 17 is provided around the second central magnetic conductive member 16 and is connected to one end of the central magnet 11 and the annular magnet 12 facing the second vibration system 30. Such an arrangement can concentrate magnetic flux on the side of the central magnet 11, the annular magnet 12 and the side magnet 13 facing the second vibration system 30, so that the magnetic field lines of the magnetic circuit system 10 on the side of the second voice coil assembly 32 are concentrated, thereby reducing leakage flux and improving the magnetic field strength.

[0114] The second side magnetic conductive member 17 and the second center magnetic conductive member 16 are spaced apart from each other, so that the combination structure of the annular magnet 12 and the second center magnetic conductive member 16 and the combination structure of the side magnet 13 and the second side magnetic conductive member 17 are spaced apart to form a second magnetic gap 12a. Due to the magnetic focusing effect of the first center magnetic conductive member 14 and the first side magnetic conductive member 15, the magnetic flux lines in the second magnetic gap 12a can be made denser, thereby increasing the magnetic field strength acting on the second voice coil assembly 32. Therefore, the magnetic circuit system 10 can be appropriately thinned or the height of the second voice coil assembly 32 can be appropriately reduced while meeting the use requirements, thereby realizing a thinned design of the sound-generating device 100 and meeting the lightweight design of the sound-generating device 100.

[0115] In this embodiment, the central magnet 11 and the annular magnet 12 are connected to each other through the second side magnetic conductive member 17 to form an integral structure. When installing the magnetic circuit system 10, it is not necessary to install the central magnet 11 and the annular magnet 12 separately, so that the assembly and disassembly of the sound-generating device 100 is relatively easy. In some embodiments, the magnetic circuit system 10 is further provided with a first side magnetic conductive member 15 located on the side facing the first vibration system 20. The first side magnetic conductive member 15 is respectively connected to the annular magnet 12 and the side magnet 13, which can be used to guide the magnetic flux lines of the magnetic circuit system 10 toward the side of the first vibration system 20, reduce the leakage magnetic flux and concentrate the magnetic flux lines; and also make the central magnet 11, the annular magnet 12 and the side magnet 13 connected in sequence through the second central magnetic conductive member 16 and the first side magnetic conductive member 15, so that the various components in the magnetic circuit system 10 are connected to form an integral structure, which is convenient for the assembly and disassembly of the magnetic circuit system 10, and there is no need to set a more complicated connection structure for fixing the inner annular magnet 12 and the central magnet 11.

[0116] Please refer to Figures 5 to 8 In one embodiment, the first voice coil assembly 22 is provided with a first voice coil 221, the second voice coil assembly 32 is provided with a second voice coil 321 and a third voice coil 322 located inside the second voice coil 321; the second magnetic gap 12a includes a first gap 121a and a second gap 122a, the first gap 121a is located outside the second gap 122a, the second voice coil 321 is arranged corresponding to the first gap 121a, and the third voice coil 322 is arranged corresponding to the second gap 122a.

[0117] In this embodiment, the single voice coil provided in the first voice coil assembly 22 is used as the first voice coil 221, and the two voice coils provided in the second voice coil assembly 32 are used as the second voice coil 321 and the third voice coil 322 respectively. Through the design of two voice coils, the total voice coil line length in the second voice coil assembly 32 is increased, and the BL is improved. The number of voice coils in the first voice coil assembly 22 is less than the number of voice coils in the second voice coil assembly 32; in this way, the total voice coil line length in the second voice coil assembly 32 can be greater than the total voice coil line length in the first voice coil assembly 22, so that when the auxiliary magnetic circuit system 10 is provided on one side of the first vibration system 20, the BL sizes of both sides are made equal, so that the performance difference of both sides is small.

[0118] In this embodiment, the second magnetic gap 12a corresponding to the second voice coil assembly 32 includes a first gap 121a and a second gap 122a respectively arranged corresponding to the second voice coil 321 and the third voice coil 322. The first gap 121a can be formed by the annular magnet 12 and the side magnet 13 being arranged at intervals in the following embodiment; the second gap 122a can be formed by the central magnet 11 and the lower protrusion 141 of the first central magnetic conductive member 14 being arranged at intervals in the following embodiment, or by arranging another magnet in the middle through hole 111 of the central magnet 11 so that the second gap 122a is formed between the magnet and the central magnet 11.

[0119] In one embodiment, the first vibration system 20 and the second vibration system 30 both vibrate along the first direction. Along the first direction, the extension height of the first voice coil 221 is equal to the extension height of the second voice coil 321 and the third voice coil 322 .

[0120] In this embodiment, the first voice coil 221 in the first voice coil assembly 22 and the second voice coil 321 and the third voice coil 322 in the second voice coil assembly 32 have the same extension height in the first direction; at this time, the second voice coil assembly 32 has an L value greater than the L value of the first voice coil assembly 22 by setting two voice coils, and the auxiliary magnetic circuit assembly 40 can increase the magnetic field strength value (B value) acting on the first voice coil assembly 22, thereby ensuring that the BL values ​​of the first vibration system 20 and the second vibration system 30 are basically consistent; and because the first vibration assembly 20 and the second vibration assembly 30 respectively increase the BL value by the auxiliary magnetic circuit assembly 40 and by increasing the number of voice coils, the heights of the first voice coil 221, the second voice coil 321 and the third voice coil 322 can be appropriately reduced, and the thickness of the magnetic circuit system 10 can also be appropriately reduced to achieve a thinning effect, thereby meeting the lightweight design requirements of the sound-generating device 100.

[0121] In one embodiment, in the first direction, the extension height of the first voice coil 221 is smaller than the extension height of the second voice coil 321 , and / or the extension height of the first voice coil 221 is smaller than the extension height of the third voice coil 322 .

[0122] In this embodiment, the extension height of the first voice coil 221 in the first direction is at least smaller than at least one of the second voice coil 321 and the third voice coil 322; for example, the extension height of the first voice coil 221 may be smaller than the extension height of the second voice coil 321, and the extension height of the third voice coil 322 may be greater than the extension height of the first voice coil 221, or may be less than or equal to the extension height of the first voice coil 221. Alternatively, the extension height of the third voice coil 322 is set to be greater than the extension height of the first voice coil 221, and the extension height of the second voice coil 321 may be greater than the extension height of the first voice coil 221, or may be less than or equal to the extension height of the first voice coil 221. It can be understood that when the BL value of the first vibration component 20 and the second vibration component 30 is increased by respectively using the auxiliary magnetic circuit component 40 and increasing the number of voice coils, the height of the first voice coil 221 can be thinned so that its height is smaller than the height of at least one of the second voice coil 321 and the third voice coil 322. The height of at least one of the second voice coil 321 and the third voice coil 322 and the thickness of the magnetic circuit system 10 in the first direction can also be appropriately reduced.

[0123] Combined with reference Figure 5 and Figure 6 In some embodiments, the voice coil length of the second voice coil 321 is greater than the voice coil length of the first voice coil 221 ; the voice coil length of the third voice coil 322 is less than the voice coil length of the first voice coil 221 .

[0124] In this embodiment, the voice coil lengths of the third voice coil 322, the first voice coil 221, and the second voice coil 321 are increased in sequence. This arrangement allows the voice coils to be staggered with each other to avoid overlapping of the voice coil heights, thereby reducing the thickness of the sound-generating device 100 in the first direction. When ensuring that the magnetic induction intensity between the second voice coil assembly 32 and the magnetic circuit system 10 is greater than the magnetic induction intensity between the first voice coil assembly 22 and the magnetic circuit system 10, by setting the third voice coil 322 with a smaller voice coil length, the magnetic induction intensity difference between the first voice coil assembly 22 and the second voice coil assembly 32 in the magnetic field of the magnetic circuit system 10 is avoided to be large, so that when the magnetic induction intensity of the first voice coil assembly 22 is enhanced by setting the auxiliary magnetic circuit assembly 40 to increase BL, the difference in BL values ​​on both sides can be reduced without setting more sub-magnets 41 in the auxiliary magnetic circuit assembly 40, thereby effectively reducing sound leakage and reducing the use of sub-magnets 41.

[0125] Combined with reference Figure 5 and Figure 6In one embodiment, the magnetic circuit system 10 includes a central magnet 11, an annular magnet 12, a side magnet 13 and a first central magnetic conductive member 14, wherein the central magnet 11 is provided with a through hole 111; the annular magnet 12 is arranged around the central magnet 11, and is spaced apart from the central magnet 11 to form a first magnetic gap 11a; the side magnet 13 is located on the circumferential side of the annular magnet 12, and is spaced apart from the annular magnet 12 to form a first gap 121a; the first central magnetic conductive member 14 includes a lower protrusion 141 and an annular portion 142 connected to one end of the lower protrusion 141, the lower protrusion 141 is located in the through hole 111, and is spaced apart from the edge of the through hole 111 to form a second gap 122a, and the annular portion 142 is arranged on the side of the central magnet 11 facing the first diaphragm assembly 21.

[0126] In this embodiment, the magnetic circuit system 10 includes a central magnet 11, an annular magnet 12 arranged around the central magnet 11, a side magnet 13 located on the circumference of the annular magnet 12, and a first central magnetic conductive member 14 partially inserted in the middle of the first central magnet 11. A through hole 111 is arranged in the middle of the central magnet 11. The central magnet 11 can be an integral structure or an annular structure formed by splicing at least two magnets; the annular magnet 12 can be an integral closed loop structure or a closed loop or open loop structure formed by a plurality of magnets arranged in a circumferential array along the central magnet 11; the central magnet 11 and the annular magnet 12 are arranged at intervals to form a first magnetic gap 11a corresponding to the first voice coil assembly 22.

[0127] The side magnet 13 may be a closed loop structure arranged around the annular magnet 12, or a plurality of magnets may be arranged in a circumferential array along the annular magnet 12. For example, when the annular magnet 12 has a square outline, four magnets are arranged corresponding to the four sides of the annular magnet 12 to serve as the side magnets 13; the annular magnet 12 and the side magnets 13 are spaced apart to form a first gap 121a corresponding to the second voice coil 321.

[0128] The first central magnetic conductive member 14 is provided with an annular portion 142 and a lower convex portion 141. The annular portion 142 is connected to the end of the central magnet 11 facing the first vibration system 20, so that the first central magnetic conductive member 14 and the central magnet 11 form an integral structure. When installing the magnetic circuit system 10, it is not necessary to install the first central magnetic conductive member 14 and the central magnet 11 separately. The lower convex portion 141 is inserted into the through hole 111 of the central magnet 11, and is spaced from the edge of the through hole 111 to form a second gap 122a corresponding to the third voice coil 322. The setting of the first central magnetic conductive member 14 can be used to guide the transmission of magnetic flux lines, so that the magnetic flux lines of the central magnet 11 facing the first vibration system 20 and the magnetic flux lines passing through the through hole 111 play a magnetic gathering role to reduce leakage magnetic flux and improve the magnetic field strength.

[0129] Optionally, the magnetic circuit system 10 can be arranged in a square shape, for example, the outer contours of the central magnet 11, the annular magnet 12, the side magnet 13 and the first central magnetic conductive member 14 are all square; the magnetic circuit system 10 can also be arranged in a circular, elliptical or other shape, so that the contours of the first gap 121a and the second gap 122a in the formed first magnetic gap 11a and the second magnetic gap 12a are respectively adapted to the first voice coil 221, the second voice coil 321 and the third voice coil 322. In some embodiments, the outer contour of the center magnet 11 may be the same as or different from the contour of the through hole 111, and the inner contour and outer contour of the annular magnet 12 may be the same as or different. For example, the contour of the first voice coil 221 is circular, and the contours of the second voice coil 321 and the third voice coil 322 are both square. The outer contour of the center magnet 11 can be set to a circle, the through hole 111 can be set to a square, the shape of the lower protrusion 141 can be adapted to the shape of the through hole 111, and the annular magnet 12 is set to an inner circle and outer square structure, so that the inner contour of the side magnet 13 is square, so that the first magnetic gap 11a formed is a circular gap adapted to the first voice coil 221, and the first gap 121a and the second gap 122a formed are square gaps adapted to the second voice coil 321 and the third voice coil 322. The shapes of the first voice coil assembly 22, the second voice coil assembly 32 and the magnetic circuit system 10 can be adjusted according to different shapes and performance requirements, which are described one by one here.

[0130] Combined with reference Figure 5 and Figure 6 In one embodiment, the magnetic circuit system 10 also includes a first side magnetic conductive member 15 arranged around the annular portion 142, the annular magnet 12 and the side magnet 13 are arranged on the side of the first side magnetic conductive member 15 facing away from the first vibration system 20, and the central magnet 11, the first central magnetic conductive member 14, the annular magnet 12 and the first side magnetic conductive member 16 together enclose a first magnetic gap 11a.

[0131] In this embodiment, the first side magnetic conductive member 15 is spaced apart from the annular portion 142 of the first central magnetic conductive member 14, so that the combination structure of the central magnet 11 and the first central magnetic conductive member 14 and the combination structure of the annular magnet 12 and the first side magnetic conductive member 15 are spaced apart to form a first magnetic gap 11a. Due to the magnetic focusing effect of the first central magnetic conductive member 14 and the first side magnetic conductive member 15, the magnetic flux lines in the first magnetic gap 11a can be made denser, so that the magnetic field strength acting on the first voice coil assembly 22 is increased, thereby appropriately thinning the magnetic circuit system 10 or appropriately reducing the height of the first voice coil assembly 22 under the premise of meeting the use requirements, thereby realizing the thinning design of the sound-generating device 100 and meeting the lightweight design of the sound-generating device 100.

[0132] In this embodiment, the annular magnet 12 and the edge magnet 13 are connected to each other through the first edge magnetic conductor 15, so that the annular magnet 12 can be suspended between the first vibration system 20 and the second vibration system 30 by fixing the edge magnet 13, making the installation of the annular magnet 12 more convenient.

[0133] In some embodiments, a protrusion 151 is provided on the side of the first side magnetic conductor 15 facing the annular magnet 12, the contour of the protrusion 151 is adapted to the contour of the annular magnet 12, the annular magnet 12 is arranged on the protrusion 151, and the side magnet 13 is arranged around the protrusion 151 and spaced apart from the protrusion 151.

[0134] In this embodiment, the depth of the first gap 121a can be increased by setting the protrusion 151, so as to prevent the second voice coil 321 from colliding with the second side magnetic conductive member 17 when it moves toward the side of the magnetic circuit system 10. The protrusion 151 can be formed by making the middle area of ​​the first side magnetic conductive member 15 as a whole concave in the direction away from the first vibration system 20, and correspondingly forming a concave structure on the side of the first side magnetic conductive member 15 facing the first side magnetic conductive member 15, and the concave structure can be used to avoid the first vibration system 20 and increase the vibration space 51 of the first vibration system 20. In some embodiments, the protrusion 151 can also be only a protrusion structure formed on the surface of the first side magnetic conductive member 15 facing the annular magnet 12, so that the surface of the first side magnetic conductive member 15 facing the first vibration system 20 is a plane.

[0135] Combined with reference Figure 5 and Figure 6 In some embodiments, the magnetic circuit system 10 also includes a second central magnetic conductive member 16 and a second side magnetic conductive member 17 arranged around the second central magnetic conductive member 16, the central magnet 11 and the annular magnet 12 are arranged on the side of the second central magnetic conductive member 16 facing away from the second vibration system 30, and the side magnet 13 is arranged on the side of the second side magnetic conductive member 17 facing away from the second vibration system 30. The annular magnet 12, the second central magnetic conductive member 16, the side magnet 13 and the second side magnetic conductive member 17 together enclose a first gap 121a, and the second central magnetic conductive member 16, the central magnet 11 and the lower protrusion 141 together enclose a second gap 122a.

[0136] In this embodiment, a second central magnetic conductive member 16 and a second side magnetic conductive member 17 are provided in the magnetic circuit system 10. The second central magnetic conductive member 16 is provided on the side of the central magnet 11 facing the second vibration system 30, and the second side magnetic conductive member 17 is provided around the second central magnetic conductive member 16 and is connected to one end of the central magnet 11 and the annular magnet 12 facing the second vibration system 30. The provision of the second central magnetic conductive member 16 and the second side magnetic conductive member 17 can gather magnetic flux on the side of the central magnet 11, the annular magnet 12 and the side magnet 13 facing the second vibration system 30, so that the magnetic field lines of the magnetic circuit system 10 on the side of the second voice coil assembly 32 are concentrated, thereby reducing leakage flux and improving the magnetic field strength. In addition, the combined structure of the annular magnet 12 and the second central magnetic conductive member 16 and the combined structure of the side magnet 13 and the second side magnetic conductive member 17 are spaced apart to form a first gap 121a corresponding to the second voice coil 321, and the combined structure of the second central magnetic conductive member 16 and the central magnet 11 and the lower protrusion 141 are spaced apart to form a second gap 122a corresponding to the third voice coil 322; due to the magnetic focusing effect of the first central magnetic conductive member 14, the second central magnetic conductive member 16 and the second side magnetic conductive member 17, the magnetic flux lines in the first gap 121a and the second gap 122a can be made denser, thereby increasing the magnetic field strength acting on the second voice coil 321 and the third voice coil 322, thereby appropriately thinning the magnetic circuit system 10 or appropriately reducing the height of the second voice coil assembly 32 on the premise of meeting the use requirements, thereby realizing a thinning design of the sound-generating device 100 and meeting the lightweight design of the sound-generating device 100.

[0137] In this embodiment, the central magnet 11, the annular magnet 12 and the side magnet 13 are connected in sequence through the second central magnetic conductive member 16 and the first side magnetic conductive member 15, so that the various components in the magnetic circuit system 10 are connected into an integral structure, which is convenient for the disassembly and assembly of the magnetic circuit system 10, and there is no need to set up a more complicated connection structure for fixing the annular magnet 12 and the central magnet 11 located on the inner side.

[0138] Please refer to Figures 1 to 8 In one embodiment, the first diaphragm assembly 21 includes a first diaphragm 211 and a first reinforcing member 212 disposed on the first diaphragm 211 .

[0139] In this embodiment, the first diaphragm 211 includes a folded ring portion, a fixed portion connected to the outer side of the folded ring portion, and a central portion connected to the inner side of the folded ring portion. The fixed portion is used to connect the first diaphragm 211 to structures such as the support member 50. The folded ring portion is an upwardly protruding convex structure or a downwardly recessed concave structure. The first reinforcement member 212 is arranged in the central portion, which can effectively strengthen the structural strength of the central portion of the first diaphragm 211 and improve the vibration performance.

[0140] Optionally, the first reinforcing member 212 may be a flat plate structure, or a skeleton structure with a first connecting portion 2121 protruding therefrom in the following embodiment, which is not limited here. The first reinforcing member 212 may be connected to the surface of the first diaphragm 211 facing the first voice coil assembly 22, or may be connected to the surface of the first diaphragm 211 facing away from the first voice coil assembly 22; the fixing portion of the first diaphragm 211 may be a complete diaphragm, or may be provided with a first inner ring hole 2111, so that the first reinforcing member 212 covers the first inner ring hole 2111.

[0141] Please refer to Figure 1 or Figure 5 In one embodiment, a first connection portion 2121 is protruded from a surface of the first reinforcement member 212 facing the first voice coil assembly 22 , and the first connection portion 2121 is connected to one end of the first voice coil assembly 22 .

[0142] In this embodiment, the first connection part 2121 is provided on the surface of the first reinforcement 212 facing the first voice coil assembly 22. The first connection part 2121 can be formed by making the area of ​​the first reinforcement 212 corresponding to the contour of the first voice coil assembly 22 as a whole concave toward one side of the first voice coil assembly 22, and a corresponding concave area will be formed on the surface of the first reinforcement 212 facing away from the first voice coil assembly 22; the first connection part 2121 can also be only a convex structure formed on the surface of the first reinforcement 212 facing the first voice coil assembly 22 to match the contour of the first voice coil assembly 22, and the surface of the first reinforcement 212 facing away from the first voice coil 221 can still be a plane. The provision of the first connection part 2121 can adjust the position of the first voice coil assembly 22 in the first magnetic gap 11a, so that the first voice coil assembly 22 is located in an area with denser magnetic flux lines, thereby improving the BL value.

[0143] Optionally, the first voice coil assembly 22 may be provided with one voice coil, or may be provided with two or more voice coils, and first connecting portions 2121 equal to the number of voice coils may be provided on the surface of the first reinforcement 212 facing the first voice coil assembly 22, so that each voice coil corresponds to the first connecting portion 2121 one by one; in some embodiments, the number of the first connecting portions 2121 provided may be less than or more than the number of voice coils, so that some voice coils are connected to the first connecting portions 2121, and the other part of the voice coils are directly connected to the plate surface of the first reinforcement 212.

[0144] Combined with reference Figure 1 and Figure 2 In one embodiment, a recessed portion 2122 is provided on a side of the first reinforcing member 212 facing the auxiliary magnetic circuit component 40 , and the auxiliary magnetic circuit component 40 is disposed corresponding to the recessed portion 2122 .

[0145] In this embodiment, a concave portion 2122 is provided on the side of the first reinforcement member 212 facing the auxiliary magnetic circuit assembly 40, and the middle surface of the first reinforcement member 212 may be concave as a whole to form a middle groove; in some embodiments, the Halbach array of the auxiliary magnetic circuit system 10 is provided corresponding to the connecting edge of the first voice coil assembly 22, and the concave portion 2122 may also be an annular groove provided along the circumference of the first voice coil assembly 22. The provision of the concave portion 2122 may play a role of avoidance, increase the distance between the first diaphragm assembly 21 and the auxiliary magnetic circuit assembly 40, increase the vibration space 511 of the first diaphragm assembly 21, and avoid the first diaphragm assembly 21 from being interfered by the auxiliary magnetic circuit assembly 40 when moving toward the side of the auxiliary magnetic circuit assembly 40, thereby affecting the vibration performance of the first vibration system 20, and ensuring the stability of the performance of the first vibration system 20.

[0146] Please refer to Figures 1 to 8 In one embodiment, the second diaphragm assembly 31 includes a second diaphragm 311 and a second reinforcement member 312 arranged on the second diaphragm 311, and a second connecting portion 3121 is provided on a side of the second reinforcement member 312 facing the second voice coil assembly 32, and the second connecting portion 3121 is connected to one end of the second voice coil assembly 32.

[0147] In this embodiment, the second diaphragm 311 includes a folded ring portion, a fixed portion connected to the outer side of the folded ring portion, and a central portion connected to the inner side of the folded ring portion. The fixed portion is used to connect the second diaphragm 311 to structures such as the support member 50. The folded ring portion is an upwardly protruding convex structure or a downwardly recessed concave structure. The second reinforcement member 312 is arranged in the central portion, which can effectively strengthen the structural strength of the central portion of the second diaphragm 311 and improve the vibration performance.

[0148] Optionally, the second reinforcing member 312 may be a flat plate structure, or a skeleton structure with a second connecting portion 3121 protruding therefrom in the following embodiment, which is not limited here. The second reinforcing member 312 may be connected to the surface of the second diaphragm 311 facing the second voice coil assembly 32, or may be connected to the surface of the second diaphragm 311 facing away from the second voice coil assembly 32; the fixing portion of the second diaphragm 311 may be a complete diaphragm, or may be provided with a second inner ring hole 3111, so that the second reinforcing member 312 covers the second inner ring hole 3111.

[0149] Please refer to Figure 1 and Figure 2 In some embodiments, a second connecting portion 3121 is provided on a side of the second reinforcement member 312 facing the second voice coil assembly 32 , and a contour of the second connecting portion 3121 is adapted to the second voice coil assembly 32 and connected to the second voice coil assembly 32 .

[0150] In this embodiment, the second connection part 3121 is provided on the surface of the second reinforcement 312 facing the second voice coil assembly 32. The second connection part 3121 can be formed by making the area of ​​the second reinforcement 312 corresponding to the contour of the second voice coil assembly 32 as a whole concave toward the side of the second voice coil assembly 32, and a corresponding concave area will be formed on the surface of the second reinforcement 312 facing away from the second voice coil assembly 32; the second connection part 3121 can also be only a convex structure formed on the surface of the second reinforcement 312 facing the second voice coil assembly 32 and adapted to the contour of the second voice coil assembly 32, and the surface of the second reinforcement 312 facing away from the second voice coil 321 can still be a plane. The provision of the second connection part 3121 can adjust the position of the second voice coil assembly 32 in the second magnetic gap 12a, so that the second voice coil assembly 32 is located in an area with denser magnetic flux lines, thereby improving the BL value.

[0151] Optionally, the second voice coil assembly 32 may be provided with one voice coil, or may be provided with two or more voice coils. For example, the second voice coil assembly 32 may be provided with a second voice coil 321 and a third voice coil 322 located inside the second voice coil 321. The second connecting parts 3121 having the same number as the voice coils may be provided on the surface of the second reinforcement 312 facing the second voice coil assembly 32, so that each voice coil is connected to the second connecting parts 3121 in a one-to-one correspondence. The number of the second connecting parts 3121 may also be less than or more than the number of the voice coils, so that some of the voice coils are connected to the second connecting parts 3121, and the other part of the voice coils are directly connected to the plate surface of the second reinforcement 312.

[0152] Please refer to Figures 1 to 8 In one embodiment, the sound-generating device 100 further includes a first connecting bracket 60 disposed between the first diaphragm assembly 21 and the magnetic circuit system 10. The first connecting bracket 60 is disposed around the circumference of the first diaphragm assembly 21 and is respectively connected to the first diaphragm assembly 21 and the magnetic circuit system 10.

[0153] In this embodiment, the sound-generating device 100 is provided with a first connecting bracket 60 for connecting the first diaphragm assembly 21 and the magnetic circuit assembly, and the first connecting bracket 60 is provided in a substantially annular structure. The first connecting bracket 60 is connected to a fixed portion of the edge of the first diaphragm 211 in the first diaphragm assembly 21, and the first connecting bracket 60 can be connected to the side magnet 13 of the magnetic circuit system 10, and can also be connected to the first side magnetic conductive member 15 when the magnetic circuit system 10 is provided with the first side magnetic conductive member 15. The setting of the first connecting bracket 60 can maintain a relatively stable positional relationship between the first vibration system 20 and the magnetic circuit system 10, and make the movable space between the first diaphragm assembly 21 and the magnetic circuit system 10 relatively fixed, thereby avoiding the movable space between the first diaphragm assembly 21 and the magnetic circuit system 10 becoming smaller due to installation deviation when installing the first diaphragm assembly 21 and the magnetic circuit system 10, or causing the distance between the first voice coil assembly 22 and the magnetic circuit system 10 to be too far, thereby avoiding interference between the first diaphragm assembly 21 and the magnetic circuit system 10, and avoiding weakening of the magnetic induction intensity between the first voice coil assembly 22 and the magnetic circuit system 10, thereby ensuring the stable vibration performance of the first vibration system 20.

[0154] Please refer to Figures 1 to 8 In one embodiment, the sound-generating device 100 further includes a second connecting bracket 70 disposed between the second diaphragm assembly 31 and the magnetic circuit system 10. The second connecting bracket 70 is disposed around the circumference of the second diaphragm assembly 31 and is respectively connected to the second diaphragm assembly 31 and the magnetic circuit system 10.

[0155] In this embodiment, the sound-generating device 100 is provided with a second connecting bracket 70 for connecting the second diaphragm assembly 31 and the magnetic circuit assembly, and the second connecting bracket 70 is provided in a substantially annular structure. The second connecting bracket 70 is connected to the fixing portion of the edge of the second diaphragm 311 in the second diaphragm assembly 31, and the second connecting bracket 70 can be connected to the side magnet 13 of the magnetic circuit system 10, and can also be connected to the second side magnetic conductive member 17 when the magnetic circuit system 10 is provided with the second side magnetic conductive member 17. The setting of the second connecting bracket 70 can maintain a relatively stable positional relationship between the second vibration system 30 and the magnetic circuit system 10, and make the movable space between the second diaphragm assembly 31 and the magnetic circuit system 10 relatively fixed, thereby avoiding the movable space between the second diaphragm assembly 31 and the magnetic circuit system 10 becoming smaller due to installation deviation when installing the second diaphragm assembly 31 and the magnetic circuit system 10, or causing the distance between the second voice coil assembly 32 and the magnetic circuit system 10 to be too far, thereby avoiding interference between the second diaphragm assembly 31 and the magnetic circuit system 10, and avoiding weakening of the magnetic induction intensity between the second voice coil assembly 32 and the magnetic circuit system 10, thereby ensuring the stable vibration performance of the second vibration system 30.

[0156] Please refer to Figure 3 or Figure 7In one embodiment, the sound-generating device 100 further includes a front cover 51, which is disposed on a side of the first diaphragm assembly 21 that is away from the magnetic circuit system 10 and forms a support member 50, a periphery of the front cover 51 is connected to a periphery of the first diaphragm assembly 21, a vibration space 511 is formed between the front cover 51 and the first diaphragm assembly 21, and the auxiliary magnetic circuit assembly 40 is disposed on the front cover 51.

[0157] In this embodiment, the sound-emitting device 100 can be arranged in a communication terminal device such as a mobile phone. The sound-emitting device 100 can be selected as a sound-emitting unit used as a handset. The front cover 51 of the sound-emitting device 100 is at least partially located on the side of the first diaphragm assembly 21 facing away from the magnetic circuit system 10, so that a vibration space 511 is formed between the front cover 51 and the first diaphragm assembly 21. The periphery of the front cover 51 is connected to the periphery of the first diaphragm assembly 21. In order to facilitate the sound-emitting device 100 to produce sound smoothly, a sound hole connected to the vibration space 511 can be provided in the front cover 51.

[0158] At the same time, the front cover 51 forms a support member 50 for installing the auxiliary magnetic circuit assembly 40. The auxiliary magnetic circuit assembly 40 can be set on the side of the front cover 51 facing the first diaphragm assembly 21, or on the side of the front cover 51 facing away from the first diaphragm assembly 21. The auxiliary magnetic circuit assembly 40 can also be installed in an installation cavity formed inside the front cover 51, which is not limited here.

[0159] Please refer to Figure 4 or Figure 8 In one embodiment, the sound-generating device 100 further includes a module upper shell 521 and a module lower shell 522 that cover each other, the module upper shell 521 and the module lower shell 522 enclose an installation space 523, and the magnetic circuit system 10, the first vibration system 20 and the second vibration system 30 are arranged in the installation space 523; at least part of the module upper shell 521 is located on the side of the diaphragm assembly facing away from the magnetic circuit system 10, the module upper shell 521 forms a support member 50, and the auxiliary magnetic circuit assembly 40 is arranged on the module upper shell 521.

[0160] In this embodiment, the sound-generating device 100 is provided with a module shell 52, and the module shell 52 forms an installation space 523 for accommodating the magnetic circuit system 10, the first vibration system 20, the second vibration system 30 and at least part of the other structures of the sound-generating device 100, so that the sound-generating device 100 can be used alone as a sound-generating device.

[0161] In the embodiment of the utility model, in order to facilitate the disassembly and assembly of various components in the module shell 52, the module shell 52 includes a module upper shell 521 and a module lower shell 522 that cover each other, and the module upper shell 521 and the module lower shell 522 are detachably connected; the module upper shell 521 is located on the side of the first vibration system 20 away from the magnetic circuit system 10, and serves as a support member 50 for fixing the auxiliary magnetic circuit assembly 40. The auxiliary magnetic circuit assembly 40 can be arranged on the side of the module upper shell 521 facing the first diaphragm assembly 21, or on the side of the module upper shell 521 facing away from the first diaphragm assembly 21. The auxiliary magnetic circuit assembly 40 can also be installed in the installation cavity formed inside the module upper shell 521, which is not limited here.

[0162] In order to make the sound-emitting device 100 produce sound smoothly, the module upper shell 521 and the first vibration system 20 cooperate with each other to form a front sound cavity 524, and a rear sound cavity is formed in the module lower shell 522. The second vibration system 30 is located in the rear sound cavity. The module shell 52 is provided with a sound outlet hole 525 connecting the front sound cavity 524 with the outside world. The sound outlet hole 525 connecting the front sound cavity 524 with the outside world can be opened on the module upper shell 521, or the module upper shell 521 and the module lower shell 522 can be spaced apart at some edges to form the sound outlet hole 525, which is not limited here.

[0163] The present invention also provides an electronic device, which includes a sound-generating device 100 as in any of the above embodiments. The specific structure of the sound-generating device 100 refers to the above embodiments. Since the electronic device provided by the present invention adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0164] The electronic device may be a mobile phone, MP3, MP4, tablet computer, earphone, wearable device, etc. In the electronic device, the sound-emitting device 100 may be assembled into the housing of the electronic device in the form of a module or in the form of a single body.

[0165] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: include: A magnetic circuit system, wherein two sides of the magnetic circuit system facing each other are respectively provided with a first magnetic gap and a second magnetic gap; A first vibration system, the first vibration system comprising a first diaphragm assembly and a first voice coil assembly connected to the first diaphragm assembly, the first voice coil assembly being arranged corresponding to the first magnetic gap; a second vibration system, arranged on a side of the magnetic circuit system away from the first vibration system, the second vibration system comprising a second diaphragm assembly and a second voice coil assembly connected to the second diaphragm assembly, the second voice coil assembly being arranged corresponding to the second magnetic gap, and the number of voice coils of the first voice coil assembly being no more than the number of voice coils of the second voice coil assembly; and A support member is provided with an auxiliary magnetic circuit component located on the side of the first diaphragm assembly facing away from the magnetic circuit system, the auxiliary magnetic circuit component forms an auxiliary magnetic field acting on the first voice coil assembly, the auxiliary magnetic circuit component includes a plurality of sub-magnets forming a Halbach array, and the magnetic field strengthening side of the auxiliary magnetic circuit component is located on its side close to the first diaphragm assembly.

2. The sound generating device according to claim 1, characterized in that: The first vibration system and the second vibration system both vibrate along a first direction, and the plurality of sub-magnets are arranged in sequence along a second direction perpendicular to the first direction; The plurality of sub-magnets include a first magnet, a second magnet and a third magnet arranged in sequence along the second direction, the first magnet and the third magnet are magnetized along the first direction and in opposite directions, and the second magnet is magnetized along the second direction toward a direction close to the first magnet; Or, the plurality of sub-magnets include a first magnet, a second magnet and a third magnet arranged in sequence along the second direction, the first magnet and the third magnet are magnetized along the second direction toward a direction close to the second magnet and the magnetization directions are opposite, and the second magnet is magnetized along the first direction toward a direction close to the first diaphragm assembly; Or, the plurality of sub-magnets include a first magnet, a second magnet, a third magnet, a fourth magnet and a fifth magnet arranged in sequence along the second direction, the first magnet, the third magnet and the fifth magnet are all magnetized along the first direction, the first magnet and the fifth magnet have the same magnetizing direction and are opposite to the magnetizing direction of the third magnet, the third magnet is magnetized along the first direction toward a direction away from the first diaphragm assembly, and the second magnet and the fourth magnet are both magnetized along the second direction toward a direction away from the third magnet and have opposite magnetizing directions.

3. The sound generating device according to claim 1, characterized in that: The auxiliary magnetic circuit assembly includes two groups of Halbach arrays composed of a plurality of sub-magnets, and the two groups of Halbach arrays are located on opposite sides of the first voice coil assembly; Alternatively, the first voice coil assembly has a plurality of connecting edges connected end to end, the auxiliary magnetic circuit assembly includes a plurality of Halbach arrays composed of a plurality of the sub-magnets, and the plurality of Halbach arrays are arranged in one-to-one correspondence with the plurality of connecting edges.

4. The sound generating device according to claim 1, characterized in that: The number of voice coils in the first voice coil assembly is the same as the number of voice coils in the second voice coil assembly; or, The number of voice coils in the first voice coil assembly is less than the number of voice coils in the second voice coil assembly.

5. The sound generating device according to claim 1, characterized in that: The first vibration system and the second vibration system both vibrate along a first direction, the first voice coil assembly and the second voice coil assembly are respectively provided with a voice coil, and along the first direction, an extension height of the first voice coil assembly is less than an extension height of the second voice coil assembly; And / or, the first voice coil assembly and the second voice coil assembly are each provided with a voice coil, and the voice coil wire length of the first voice coil assembly is less than the voice coil wire length of the second voice coil assembly.

6. The sound generating device according to claim 1, characterized in that: The magnetic circuit system comprises: Center magnet; an annular magnet, the annular magnet is disposed around the central magnet and is spaced apart from the central magnet to form the first magnetic gap; and The side magnets are located at the peripheral side of the annular magnet and are spaced apart from the annular magnet to form the second magnetic gap.

7. The sound generating device according to claim 6, characterized in that: The magnetic circuit system also includes: A first central magnetic conductive member, wherein the central magnet is disposed on a side of the first central magnetic conductive member facing away from the first vibration system; and A first side magnetic conductive member is arranged around the first central magnetic conductive member, the first side magnetic conductive member is arranged at a distance from the first central magnetic conductive member, the annular magnet and the side magnet are arranged on a side of the first side magnetic conductive member facing away from the first vibration system, and the central magnet, the first central magnetic conductive member, the annular magnet and the first side magnetic conductive member jointly enclose the first magnetic gap; Among them, a protrusion is provided on the side of the first side magnetic conductor facing the annular magnet, the contour of the protrusion is adapted to the contour of the annular magnet, the annular magnet is arranged on the protrusion, and the side magnet is arranged on the peripheral side of the protrusion and spaced apart from the protrusion.

8. The sound generating device according to claim 1, characterized in that: The first voice coil assembly is provided with a first voice coil, and the second voice coil assembly is provided with a second voice coil and a third voice coil located inside the second voice coil; The second magnetic gap includes a first gap and a second gap, the first gap is located outside the second gap, the second voice coil is arranged corresponding to the first gap, and the third voice coil is arranged corresponding to the second gap.

9. The sound generating device according to claim 8, characterized in that: The magnetic circuit system comprises: A central magnet, wherein the central magnet is provided with a through hole; an annular magnet, the annular magnet is arranged around the central magnet and is spaced apart from the central magnet to form the first magnetic gap; a side magnet, the side magnet being located at a peripheral side of the annular magnet and spaced apart from the annular magnet to form the first gap; and The first central magnetic conductive member includes a lower protrusion and an annular portion connected to one end of the lower protrusion, the lower protrusion is located in the through hole and is spaced apart from the edge of the through hole to form the second gap, and the annular portion is arranged on the side of the central magnet facing the first diaphragm assembly.

10. The sound generating device according to claim 1, characterized in that: The first diaphragm assembly includes a first diaphragm and a first reinforcing member provided on the first diaphragm; Wherein, a first connecting portion is protruded on a surface of the first reinforcing member facing the first voice coil assembly, and the first connecting portion is connected to one end of the first voice coil assembly; And / or, a recessed portion is provided on a side of the first reinforcing member facing the auxiliary magnetic circuit component, and the auxiliary magnetic circuit component is arranged corresponding to the recessed portion.

11. The sound generating device according to claim 1, characterized in that: The second diaphragm assembly includes a second diaphragm and a second reinforcement member arranged on the second diaphragm. A second connecting portion is provided on a side of the second reinforcement member facing the second voice coil assembly. The second connecting portion is connected to one end of the second voice coil assembly.

12. The sound generating device according to claim 1, characterized in that: The sound-generating device further includes a first connecting bracket disposed between the first diaphragm assembly and the magnetic circuit system, the first connecting bracket being disposed around the circumference of the first diaphragm assembly and being connected to the first diaphragm assembly and the magnetic circuit system respectively; And / or, the sound-generating device further comprises a second connecting bracket arranged between the second diaphragm assembly and the magnetic circuit system, the second connecting bracket being arranged around the circumference of the second diaphragm assembly and being connected to the second diaphragm assembly and the magnetic circuit system respectively.

13. The sound generating device according to any one of claims 1 to 12, characterized in that: The sound-generating device also includes a front cover, which is arranged on the side of the first diaphragm assembly facing away from the magnetic circuit system and forms the support member. The periphery of the front cover is connected to the periphery of the first diaphragm assembly, a vibration space is formed between the front cover and the diaphragm assembly, and the auxiliary magnetic circuit assembly is arranged on the front cover.

14. The sound generating device according to any one of claims 1 to 12, characterized in that: The sound-generating device further comprises a module upper shell and a module lower shell covering each other, wherein the module upper shell and the module lower shell enclose an installation space, and the magnetic circuit system, the first vibration system and the second vibration system are arranged in the installation space; At least a portion of the module upper shell is located on the side of the diaphragm assembly facing away from the magnetic circuit system, the module upper shell forms the support member, and the auxiliary magnetic circuit assembly is arranged on the module upper shell.

15. An electronic device, characterized in that: The electronic device comprises the sound generating device as claimed in any one of claims 1 to 14.

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