Sound production module and electronic equipment

Abstract

The invention discloses a sound production module and electronic equipment, the sound production module comprises a module shell and a sound production monomer, a vibrating diaphragm assembly of a vibrating system of the sound production monomer comprises a body and a magnetic material coating arranged on the body, a module upper shell of the module shell is located on one side, opposite to a magnetic circuit system, of the vibrating diaphragm assembly, and the module upper shell is provided with an auxiliary magnet; wherein a first attraction force exists between the vibrating diaphragm assembly and the auxiliary magnet, a second attraction force exists between the vibrating diaphragm assembly and the magnetic circuit system, and in a non-working state, the vibrating system is located at a balance position between the auxiliary magnet and the magnetic circuit system under the effect of the resultant force of the first attraction force and the second attraction force. According to the invention, the magnetic material coating and the auxiliary magnet are arranged, and the static magnetic force is introduced into the vibration system to reduce the rigidity of the vibration system, so that the low-frequency effect of the sound production module is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducer, and in particular to a sound module and an electronic device using the sound module. Background Art

[0002] In recent years, consumer electronic products have developed rapidly, and electronic devices such as smart phones and VR devices have been recognized by consumers and widely used. Those skilled in the art have also made corresponding improvements to related supporting products such as headphones to meet the performance requirements of electronic products and meet the needs of consumers for product performance.

[0003] The sound-generating device is an important electroacoustic transducer component in consumer electronic products, and is widely used as speakers, receivers, headphones, etc. With the improvement of the performance of electronic products, the improvement of the acoustic performance of the sound-generating device is also an inevitable trend. Loudness (sensitivity) is the main performance indicator of the sound-generating device. In theory, the low-frequency loudness of the sound-generating device is closely related to the maximum amount of air that its diaphragm assembly can push.

[0004] In the related technology, as the requirements for electronic devices to be thinner and lighter become higher and higher, the assembly space left for micro sound devices in electronic devices is getting smaller and smaller. In order to meet the requirements of acoustic performance, it is necessary to reserve a larger vibration space to meet the large amplitude requirements. However, the driving force factor BL value of the product will decrease as the displacement of the vibration system increases, thereby limiting the performance of the product and failing to significantly improve the low-frequency effect of the product. Summary of the invention

[0005] The main purpose of the present invention is to provide a sound module and an electronic device, which aims to introduce static magnetic force into the vibration system by setting a magnetic material coating and an auxiliary magnet, and reduce the stiffness of the vibration system by static magnetic force, so as to greatly improve the low-frequency effect of the sound module.

[0006] To achieve the above object, the present invention provides a sound module, which includes:

[0007] A module housing, wherein an installation space is provided in the module housing, and the module housing comprises a module upper shell and a module lower shell connected to each other; and

[0008] A sound-generating unit, the sound-generating unit comprising a magnetic circuit system and a vibration system arranged in the installation space, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion and a side magnetic portion arranged on the magnetic yoke, the central magnetic portion and the side magnetic portion being spaced apart to form a magnetic gap, the vibration system being arranged on one side of the magnetic circuit system, the vibration system comprising a diaphragm assembly and a voice coil connected to the diaphragm assembly, the end of the voice coil away from the diaphragm assembly being arranged corresponding to the magnetic gap, the diaphragm assembly comprising a body and a magnetic material coating arranged on the body, the module upper shell being located on the side of the diaphragm assembly facing away from the magnetic circuit system, the module upper shell being provided with an auxiliary magnet, the magnetizing direction of the auxiliary magnet being opposite to the magnetizing direction of the central magnetic portion;

[0009] There is a first suction force between the diaphragm assembly and the auxiliary magnet, and a second suction force between the diaphragm assembly and the magnetic circuit system. When not in operation, the vibration system is located at a balanced position between the auxiliary magnet and the magnetic circuit system under the combined force of the first suction force and the second suction force.

[0010] In one embodiment, the magnetic material coating is disposed on a side of the body facing the upper shell of the module;

[0011] And / or, the magnetic material coating is provided on a side of the body facing the central magnetic portion;

[0012] And / or, the main body is provided with a fixed cavity, and the magnetic material coating is provided in the fixed cavity.

[0013] In one embodiment, the magnetic material coating comprises a coating layer and magnetic powder, and the magnetic powder is doped or mixed in the coating layer;

[0014] The magnetic powder is at least one of iron powder, nickel powder, manganese zinc ferrite powder, nickel zinc ferrite powder, neodymium iron boron powder, aluminum iron boron powder, iron silicon powder and sendust aluminum powder.

[0015] In one embodiment, the magnetic material coating comprises a plurality of coatings; the plurality of coatings are arranged on the same side and / or different sides of the body; and / or the plurality of coatings are arranged in a spliced ​​manner or in an interval manner;

[0016] And / or, the magnetic material coating is circular, elliptical or polygonal;

[0017] And / or, the central axis of the magnetic material coating coincides with the central axis of the sound-emitting unit.

[0018] In one embodiment, the body has a first surface and a second surface disposed away from each other and a peripheral side surface connecting the first surface and the second surface;

[0019] The magnetic material coating covers at least a portion of the first surface; and / or, the magnetic material coating covers at least a portion of the second surface; and / or, the magnetic material coating covers the first surface and the peripheral side surface; and / or, the magnetic material coating covers the second surface and the peripheral side surface.

[0020] In one embodiment, the body includes a diaphragm and a spherical top, the diaphragm is provided with an inner ring hole, the spherical top cover is provided on the inner ring hole, and the magnetic material coating is provided on the spherical top.

[0021] In one embodiment, the ball top is provided with a fixing groove, and the magnetic material coating is provided in the fixing groove.

[0022] In one embodiment, the fixing groove is formed by a side of the spherical top facing away from the central magnetic part and concave toward the central magnetic part.

[0023] In one embodiment, the central magnetic portion includes a central magnet and a central magnetic conductive plate which are stacked, the central magnet is connected to the magnetic conductive yoke, and the central magnetic conductive plate is provided with a recessed area corresponding to the magnetic material coating.

[0024] In one embodiment, part of the central magnetic conductive plate is recessed in a direction away from the diaphragm assembly to form the recessed area;

[0025] Alternatively, the recessed area is a through hole structure penetrating the central magnetic conductive plate.

[0026] In one embodiment, the recessed area is a through hole, the central magnet is provided with a protruding portion corresponding to the through hole, and the protruding portion is located in the through hole.

[0027] In one embodiment, the module upper shell cooperates with the sound-emitting monomer to form a front sound cavity, and the module shell is provided with a sound outlet hole connected to the front sound cavity;

[0028] Among them, the auxiliary magnet is arranged on the side of the module upper shell facing the front sound cavity; and / or, the auxiliary magnet is arranged on the side of the module upper shell facing away from the front sound cavity; and / or, the module upper shell is provided with an installation cavity, and the auxiliary magnet is arranged in the installation cavity.

[0029] In one embodiment, the auxiliary magnet is bonded or welded to the upper shell of the module;

[0030] Alternatively, the auxiliary magnet and the module upper shell are integrally injection molded.

[0031] In one embodiment, the auxiliary magnets include a plurality of auxiliary magnets; the plurality of auxiliary magnets are arranged on the same side or different sides of the upper shell of the module; and / or the plurality of auxiliary magnets are arranged in a spliced ​​manner or in an interval manner;

[0032] And / or, the auxiliary magnet is circular, elliptical or polygonal;

[0033] And / or, the auxiliary magnet is a magnet;

[0034] And / or, the central axis of the auxiliary magnet coincides with the central axis of the sound-emitting unit;

[0035] And / or, the auxiliary magnet is arranged opposite to the magnetic material coating;

[0036] And / or, a mounting groove is provided on a side of the module upper shell facing the diaphragm assembly, and the auxiliary magnet is arranged in the mounting groove.

[0037] The present invention also provides an electronic device, which includes the sound module mentioned above.

[0038] The sound module of the technical solution of the present invention sets the module shell as a connected module upper shell and module lower shell, so that the module upper shell is located on the side of the diaphragm assembly of the sound unit facing away from the magnetic circuit system, and the diaphragm assembly is set as a body and a magnetic material coating arranged on the body, and an auxiliary magnet is arranged on the module upper shell, so that the magnetization direction of the auxiliary magnet is opposite to the magnetization direction of the central magnetic part, so that there is a first suction force between the diaphragm assembly and the auxiliary magnet, and there is a second suction force between the diaphragm assembly and the magnetic circuit system, so that the magnetic material coating interacts with the auxiliary magnet of the module upper shell and the magnetic circuit system respectively, and introduces a static magnetic force into the vibration system, thereby effectively reducing the strain recovery force of the diaphragm assembly during movement. It can be understood that by setting the magnetic material coating and the auxiliary magnet, the static magnetic force is introduced into the vibration system, and the stiffness of the vibration system is reduced by the static magnetic force, so that the compliance of the diaphragm assembly is better, thereby greatly improving the low-frequency effect of the sound module. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0040] Figure 1 It is a structural schematic diagram of a sound module in one embodiment of the present invention;

[0041] Figure 2A schematic diagram of the structure of a sound module from another perspective in one embodiment of the present invention;

[0042] Figure 3 is an exploded schematic diagram of a sound module in one embodiment of the present invention;

[0043] Figure 4 A partially exploded schematic diagram of a sound module according to an embodiment of the present invention;

[0044] Figure 5 A cross-sectional schematic diagram of a sound module according to an embodiment of the present invention;

[0045] Figure 6 is a cross-sectional schematic diagram of a sound module in another embodiment of the present invention;

[0046] Figure 7 is a cross-sectional schematic diagram of a sound-emitting unit in one embodiment of the present invention;

[0047] Figure 8 is a cross-sectional schematic diagram of a sound-emitting unit in another embodiment of the present invention;

[0048] Fig. 9 It is a cross-sectional schematic diagram of a sound-emitting unit in another embodiment of the present invention;

[0049] Fig.10 It is a cross-sectional schematic diagram of a sound-emitting unit in yet another embodiment of the present invention;

[0050] Fig.11 is a cross-sectional schematic diagram of a diaphragm assembly in a first embodiment of the present invention;

[0051] Fig.12 is a cross-sectional schematic diagram of a diaphragm assembly according to a second embodiment of the present invention;

[0052] Fig.13 is a cross-sectional schematic diagram of a diaphragm assembly in a third embodiment of the present invention;

[0053] Fig.14 is a cross-sectional schematic diagram of a diaphragm assembly in a fourth embodiment of the present invention;

[0054] Fig.15 is a cross-sectional schematic diagram of a magnetic material coating in one embodiment of the present invention;

[0055] Fig.16 A static magnetostrictive force curve diagram of the vibration direction of the sound module in one embodiment of the present invention;

[0056] Fig.17 The stiffness curve diagram of the sound module of the present invention and the existing design;

[0057] Fig.18 The figure is a test diagram of the frequency response performance of the sound module of the present invention and the existing design.

[0058] Description of Figure Numbers:

[0059]

[0060]

[0061] The realization of the purpose, functional features and advantages of the present invention 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 present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0064] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0065] In addition, in the present invention, descriptions such as "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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0066] The present invention provides a sound module 500. It is understandable that the sound module 500 can be applied to electronic devices, and the electronic devices can be smart watches, mobile phones, speakers, computers, headphones or televisions, etc., which are not limited here.

[0067] It should be noted that loudness (sensitivity) is the main performance indicator of the sound module 500. In theory, the low-frequency loudness of the sound module 500 is closely related to the maximum amount of air that can be pushed by the diaphragm assembly 31 of its sound unit 100. However, the volume of the sound module 500 in the smart device is getting smaller and smaller, making the effective vibration area (Sd) and the back cavity volume of the sound module 500 smaller and smaller. Therefore, a larger vibration space needs to be reserved to meet the large amplitude (X max ) demand. However, the driving force factor BL value of the product will decrease as the displacement of the vibration system 3 of the sound-emitting monomer 100 increases. This results in that although a large vibration space is reserved, at actual low frequencies, even if the PA outputs a driving signal at full amplitude, the displacement of the vibration system 3 of the sound-emitting monomer 100 still cannot reach X. max , which greatly limits the performance of the product.

[0068] Considering that Sd is limited under given physical space constraints, the BL value is also limited under certain physical space and manufacturing level constraints. Therefore, the present invention adjusts the system stiffness (Kms) in the sound module 500 to achieve a significant improvement in low frequency. In the present invention, a static magnetic force is introduced into the vibration system 3 of the sound unit 100 through a new magnetic circuit design, and the static magnetic force is used to reduce the stiffness of the vibration system 3, thereby achieving a significant improvement in low frequency.

[0069] Please refer to Figures 1 to 15 As shown, in the embodiment of the present invention, the sound module 500 includes a module shell 400 and a sound unit 100, the module shell 400 is provided with an installation space 421, the module shell 400 includes a module upper shell 410 and a module lower shell 420 connected to each other, the sound unit 100 includes a magnetic circuit system 2 and a vibration system 3 arranged in the installation space 421, the magnetic circuit system 2 includes a magnetic yoke 21 and a central magnetic portion 22 and a side magnetic portion 23 arranged on the magnetic yoke 21, the central magnetic portion 22 and the side magnetic portion 23 are arranged to form a magnetic gap 24, the vibration system 3 is arranged on one side of the magnetic circuit system 2, the vibration system 3 includes a diaphragm assembly 31 and a voice coil 32 connected to the diaphragm assembly 31, the voice coil 3 2 is arranged at one end away from the diaphragm assembly 31 corresponding to the magnetic gap 24, the diaphragm assembly 31 includes a body 311 and a magnetic material coating 312 arranged on the body 311, the module upper shell 410 is located at the side of the diaphragm assembly 31 facing away from the magnetic circuit system 2, the module upper shell 410 is provided with an auxiliary magnet 411, and the magnetization direction of the auxiliary magnet 411 is opposite to the magnetization direction of the central magnetic part 22; wherein, there is a first suction force between the diaphragm assembly 31 and the auxiliary magnet 411, and there is a second suction force between the diaphragm assembly 31 and the magnetic circuit system 2, and in the non-working state, the vibration system 3 is located at a balanced position between the auxiliary magnet 411 and the magnetic circuit system 2 under the combined force of the first suction force and the second suction force.

[0070] In this embodiment, the sound unit 100 of the sound module 500 may be a speaker sound unit, and the speaker may be a micro speaker. The sound module 500 may be a module structure, and the module housing 400 of the sound module 500 is formed with an installation space 421, and the sound unit 100 is arranged in the installation space 421 of the module housing 400. Optionally, the module housing 400 includes a module upper shell 410 and a module lower shell 420. The sound unit 100 is arranged in the installation space 421, so that at least part of the structure of the module upper shell 410 is located on the side of the diaphragm assembly 31 facing away from the magnetic circuit system 2.

[0071] It can be understood that the sound unit 100 is arranged in the installation space 421, so that the sound unit 100 cooperates with the module upper shell 410 of the module shell 400 to form a front sound cavity 430, and the sound unit 100 cooperates with the module upper shell 410 and the module lower shell 420 of the module shell 400 to form a rear sound cavity 440. In this embodiment, Figure 5 and Figure 6 As shown, the diaphragm assembly 31 of the sound-emitting unit 100 faces the front sound cavity 430, and the magnetic circuit system 2 is located in the rear sound cavity 440. Optionally, the auxiliary magnet 411 is disposed on the upper shell 410 of the module.

[0072] In order to facilitate the sound module 500 to produce sound smoothly, in one embodiment, the module upper shell 410 cooperates with the sound unit 100 to form a front sound cavity 430, and the module shell 400 is provided with a sound hole 413 connected to the front sound cavity 430.

[0073] In this embodiment, the sound outlet hole 413 may be arranged directly opposite to the diaphragm assembly 31, so that the sound module 500 is in a positive sound outlet structure. Of course, in other embodiments, the sound outlet hole 413 may not be arranged directly opposite to the diaphragm assembly 31, and the sound outlet hole 413 may be located at the side or periphery of the diaphragm assembly 31, in which case the sound module 500 is in a side sound outlet structure.

[0074] Understandable, such as Figure 5 and Figure 6 As shown, the module upper shell 410 is also provided with a sound guide, which forms a sound outlet channel, one end of which is connected to the front sound cavity 430, and the other end of which is connected to the sound outlet hole 413.

[0075] In one embodiment, a support platform 412 is provided on the module upper shell 410 surrounding the auxiliary magnet 411, the sound unit 100 is supported on the support platform 412, and is enclosed with the module upper shell 410 to form a front sound cavity 430, the diaphragm assembly 31 faces the front sound cavity 430, the sound unit 100, the module upper shell 410 and the module lower shell 420 are enclosed to form a rear sound cavity 440, the magnetic circuit system 2 faces the rear sound cavity 440, and the module upper shell 410 is also provided with a sound outlet hole 413 connected to the front sound cavity 430.

[0076] In this embodiment, if Figure 5 and Figure 6 As shown, the upper shell 410 of the module is provided with a support platform 412 around the auxiliary magnet 411, the vibration system 3 of the sound unit 100 is supported on the support platform 412, and is enclosed with the upper shell 410 of the module to form a front sound cavity 430, and the diaphragm assembly 31 faces the front sound cavity 430. The magnetic circuit system 2 and the vibration system 3 of the sound unit 100 are arranged in the installation space 421, so that the vibration system 3, the upper shell 410 of the module and the lower shell 420 of the module are enclosed to form a rear sound cavity 440, and the magnetic circuit system 2 is located in the rear sound cavity 440.

[0077] Optionally, both ends of the support platform 412 are connected to the sound guide, so that the support platform 412 and the sound guide are enclosed to form a mounting groove or groove structure. In order to facilitate the installation and fixing of the sound unit 100, the support platform 412 can be a planar support platform structure, and the support platform 412 can also be arranged in a step structure, so that the peripheral support of the vibration system 3 of the sound unit 100 is fixed to the step structure, which is not limited here.

[0078] It is understandable that in order to further improve the sound effect of the sound module 500, the rear sound cavity 440 of the sound module 500 can be filled with sound-absorbing particles. In order to prevent the sound-absorbing particles from entering the interior of the sound unit 100 and affecting the magnetic circuit system 2 and the vibration system 3 of the sound unit 100. The sound module 500 also includes an isolation and ventilation structure, which is arranged in the rear sound cavity 440 to prevent the sound-absorbing particles from entering the interior of the sound unit 100, and is not limited here.

[0079] It should be noted that the structure of the module housing 400 is not limited to the module upper shell 410 and the module lower shell 420. Of course, in other embodiments, the module housing 400 also includes a module middle shell, and the module middle shell, the module upper shell 410 and the module lower shell 420 together define an installation space 421, which is not limited here. In this embodiment, along the vibration direction of the vibration system 3 of the sound unit 100, the module middle shell of the module housing 400 is located between the module upper shell 410 and the module lower shell 420, and the two ends of the module middle shell are respectively connected to the module upper shell 410 and the module lower shell 420.

[0080] It is understandable that the structure of the module upper shell 410 of the module housing 400 is not limited to the structural form of the present invention, and can also be other structural design forms, as long as it can support and fix the auxiliary magnet 411, and no limitation is made here.

[0081] In the present invention, the magnetic circuit system 2 and the vibration system 3 of the sound-emitting unit 100 are arranged relative to each other. Optionally, the magnetic circuit system 2 can be arranged in a square shape. For example, the magnetic circuit system 2 can include a central magnetic portion 22 and a side magnetic portion 23, both of which are square structures. The vibration system 3 is also arranged in a square shape. It can be understood that the periphery of the diaphragm assembly 31 of the vibration system 3 can be connected to the magnetic circuit system 2, or the magnetic circuit system 2 and the vibration system 3 can be respectively assembled on the outer shell or the module shell, etc., which is not limited here.

[0082] In order to better assemble the magnetic circuit system 2 and the vibration system 3 of the sound unit 100. In one embodiment, as Figures 3 to 10 As shown, the sound unit 100 also includes a shell 1, a magnetic circuit system 2 is connected to one end of the shell 1, and a vibration system 3 is connected to the other end of the shell 1 and arranged opposite to the magnetic circuit system 2, that is, the periphery of the diaphragm assembly 31 of the vibration system 3 is connected to the other end of the shell 1 and arranged opposite to the magnetic circuit system 2.

[0083] In this embodiment, the housing 1 is used to install, fix and support components such as the magnetic circuit system 2 and the vibration system 3, that is, the housing 1 provides an installation base for components such as the magnetic circuit system 2 and the vibration system 3. It can be understood that the housing 1 can be an integral structure or can be formed by the cooperation of multiple split structures, which is not limited here. The housing 1 in this embodiment can be selected as a square frame or frame structure, that is, the housing 1 has a cavity with openings at both ends, and the magnetic circuit system 2 and the vibration system 3 are respectively connected to the two sides of the housing 1 and are arranged relative to each other, so that the magnetic circuit system 2, the housing 1 and the diaphragm assembly 31 of the vibration system 3 enclose a vibration cavity.

[0084] It can be understood that the sound-emitting unit 100 sets the magnetic circuit system 2 as a magnetic yoke 21 and a central magnetic portion 22 and a side magnetic portion 23 provided on the magnetic yoke 21. The magnetic circuit system 2 can be connected to the outer shell 1 through the periphery of the magnetic yoke 21; or, the magnetic circuit system 2 can be connected to the outer shell 1 through the side magnetic portion 23, which is not limited here.

[0085] In this embodiment, the side magnetic portion 23 is located outside the central magnetic portion 22 and is enclosed with the central magnetic portion 22 to form a magnetic gap 24, so that the diaphragm assembly 31 of the vibration system 3 is connected to the end of the housing 1 away from the magnetic yoke 21, and is opposite to and spaced from the magnetic circuit system 2, so that one end of the voice coil 32 is connected to the diaphragm assembly 31, and the other end of the voice coil 32 is set corresponding to the magnetic gap 24.

[0086] It should be noted that the voice coil 32 can be a flat voice coil, in which case it is fixed to the side of the diaphragm assembly 31 facing the magnetic circuit system 2, and is opposite to and spaced from the magnetic gap 24 of the magnetic circuit system 2, that is, the other end of the voice coil 32 is located outside the magnetic gap 24, and along the vibration direction of the vibration system 3, the other end of the voice coil 32 is opposite to the magnetic gap 24; or, the voice coil 32 is an annular runway voice coil, in which case one end of the voice coil 32 is connected to the diaphragm assembly 31, and the other end of the voice coil 32 is suspended in the magnetic gap 24, which is not limited here.

[0087] In order to realize the electrical connection between the voice coil 32 of the sound unit 100 and the external circuit. Figure 3 , Figures 5 to 10 As shown, the sound unit 100 further includes a centering support 33 , one end of the centering support 33 is connected to the voice coil 32 , and the other end of the centering support 33 is connected to the housing 1 .

[0088] It can be understood that the two ends of the centering support 33 are electrically connected to the lead wires of the voice coil 32 and the external circuit respectively. In this embodiment, the centering support 33 can be arranged at the bottom of the voice coil 32, and the centering support 33 is located at the four corners of the sound unit 100 or in the short axis or long axis direction of the sound unit 100. Of course, the centering support 33 can also be arranged at the top of the voice coil 32, and the centering support 33 is located between the voice coil 32 and the diaphragm assembly 31, which is not limited here.

[0089] In one embodiment, the body 311 includes a diaphragm 3111 and a dome 3113 . The diaphragm 3111 is provided with an inner ring hole 3112 . The dome 3113 covers the inner ring hole 3112 . Optionally, a magnetic material coating 312 is provided on the dome 3113 .

[0090] In this embodiment, if Figures 3 to 10 As shown, the diaphragm 3111 includes a folding ring portion, a fixing portion connected to the outer side of the folding ring portion, and a central portion connected to the inner side of the folding ring portion, and the dome 3113 is arranged at the central portion. It can be understood that the fixing portion, the folding ring portion and the central portion of the diaphragm 3111 are sequentially connected to form an integrated structure, thereby ensuring the vibration performance and structural strength of the diaphragm 3111. Optionally, the folding ring portion of the diaphragm 3111 is a convex structure that bulges upward or a concave structure that is concave downward, which is not limited here.

[0091] It can be understood that the dome 3113 is disposed at the central part of the diaphragm 3111, which can effectively strengthen the structural strength of the central part of the diaphragm 3111. By disposing the magnetic material coating 312 on the dome 3113, the magnetic material coating 312 interacts with the auxiliary magnet 411 or the magnetic circuit system 2 to generate static magnetostatic force, so as to change the stiffness of the diaphragm 3111. Optionally, the central part of the diaphragm 3111 can be a flat plate structure or a ring structure.

[0092] Optionally, a receiving groove is provided in the central part of the diaphragm 3111, and at least a part of the dome 3113 is located in the receiving groove. It can be understood that by providing the receiving groove on the side of the diaphragm 3111 facing away from the voice coil 32, the dome 3113 can be conveniently installed and accommodated in the receiving groove, ensuring that the upper surface of the dome 3113 is flush with the upper surface of the diaphragm 3111, thereby reducing the height of the sound-emitting unit 100 along the vibration direction of the vibration system 3, and ensuring the vibration performance of the entire diaphragm assembly 31.

[0093] In order to reduce the weight of the diaphragm assembly 31, the diaphragm 3111 is provided with an inner ring hole 3112, and the ball top 3113 is covered in the inner ring hole 3112. In this embodiment, the inner ring hole 3112 is provided in the central part of the diaphragm 3111, and the periphery of the ball top 3113 is connected to the central part. The ball top 3113 can be connected to the side of the central part of the diaphragm 3111 facing the voice coil 32 or the side facing away from the voice coil 32.

[0094] Optionally, a step surface is formed on the periphery of the dome 3113, and one side of the diaphragm 3111 adjacent to the inner ring hole 3112 is supported and connected to the step surface, and the step surface is located between the voice coil 32 and the diaphragm 3111. It can be understood that by providing a step surface on the periphery of the dome 3113 so that the step surface is recessed toward one side of the voice coil 32, it is ensured that when the central part of the diaphragm 3111 is overlapped and supported on the step surface of the dome 3113, the upper surface of the central part of the diaphragm 3111 is flush with the upper surface of the dome 3113, thereby making the assembly structure more compact and ensuring the vibration performance of the entire diaphragm assembly 31.

[0095] In this embodiment, a magnetic material coating 312 is provided on the main body 311 of the diaphragm assembly 31 of the vibration system 3, and a module upper shell 410 is provided on the side of the diaphragm assembly 31 facing away from the magnetic circuit system 2, and an auxiliary magnet 411 is provided on the module upper shell 410, so that a first suction force is provided between the magnetic material coating 312 of the diaphragm assembly 31 and the auxiliary magnet 411, and a second suction force is provided between the magnetic material coating 312 of the diaphragm assembly 31 and the magnetic circuit system 2. When the sound unit 100 is in a non-working state, the vibration system 3 is located in a balanced position between the auxiliary magnet 411 and the magnetic circuit system 2 under the action of the combined force of the first suction force and the second suction force.

[0096] It can be understood that when the vibration system 3 is working, the combined force of the first suction force and the second suction force is opposite to the direction of the strain recovery force of the vibration system 3 and is smaller than the strain recovery force of the diaphragm assembly 31; when the vibration system 3 stops working, the equivalent stiffness of the combined force of the first suction force and the second suction force is not greater than the stiffness of the vibration system 3, and the vibration system 3 is located at a balanced position between the auxiliary magnet 411 and the magnetic circuit system 2 under the action of the combined force of the first suction force and the second suction force. In this way, by introducing static magnetic force into the vibration system 3, the stiffness of the vibration system 3 is reduced by static magnetic force, thereby achieving the effect of greatly improving the low frequency.

[0097] It should be noted that the main body 311 of the diaphragm assembly 31 is provided with auxiliary magnets 411 and a magnetic circuit system 2 for attracting the magnetic material coating 312 on both sides in the vibration direction, that is, the auxiliary magnets 411 and the magnetic circuit system 2 are respectively located on both sides of the main body 311, so that when the main body 311 vibrates with the vibration system 3, the magnetic material coating 312 can be close to the auxiliary magnets 411 or close to the magnetic circuit system 2. Optionally, the auxiliary magnets 411 and the magnetic circuit system 2 can be provided by magnets.

[0098] In this embodiment, the magnetization direction of the auxiliary magnet 411 is opposite to the magnetization direction of the central magnet 221 in the central magnetic part 22. Therefore, the magnetic flux lines generated by the auxiliary magnet 411 are opposite to the magnetic flux lines generated by the central magnetic part 22 and repel each other. The two parts of the magnetic flux lines pass through the voice coil 32 horizontally, thereby increasing the strength of the magnetic flux lines acting on the voice coil 32, increasing the BL value of the product, and further improving the sound sensitivity of the sound unit 100.

[0099] When the body 311 is close to the auxiliary magnet 411, it is away from the magnetic circuit system 2. Therefore, the attraction between the magnetic material coating 312 and the auxiliary magnet 411 becomes larger, and the attraction between the magnetic material coating 312 and the magnetic circuit system 2 becomes smaller, and the combined force of the first attraction and the second attraction is directed toward the auxiliary magnet 411. The total attraction to the magnetic material coating 312 can be used as a force applied to the vibration system 3.

[0100] Based on the same principle, when the body 311 is close to the magnetic circuit system 2, it is away from the auxiliary magnet 411. Therefore, the attraction between the magnetic material coating 312 and the auxiliary magnet 411 becomes smaller, and the attraction between the magnetic material coating 312 and the magnetic circuit system 2 becomes larger, and the combined force of the first attraction and the second attraction is directed toward the direction of the magnetic circuit system 2. The total attraction to the magnetic material coating 312 can be used as a force applied to the vibration system 3.

[0101] Optionally, when the vibration system 3 is at a balanced position, the attraction of the auxiliary magnet 411 on the magnetic material coating 312 is equal to the attraction of the magnetic circuit system 2 , so as to prevent the attraction on the magnetic material coating 312 from affecting the balanced position of the vibration system 3 .

[0102] Specifically, taking the vibration of the vibration system 3 in the up and down direction as an example, when the vibration system 3 is not working, the diaphragm assembly 31 is located at the initial position. When the vibration system 3 is working, the voice coil 32 drives the diaphragm assembly 31 to vibrate up and down. When the diaphragm assembly 31 is located above the initial position, the direction of the strain recovery force of the diaphragm 3111 is downward. At this time, the first suction force between the magnetic material coating 312 and the auxiliary magnet 411 is upward, and the second suction force between the magnetic material coating 312 and the magnetic circuit system 2 is downward, and the first suction force is greater than the second suction force. The combined force of the first suction force and the second suction force is less than the strain recovery force of the diaphragm 3111 and is in an upward direction. Therefore, the combined force of the first suction force and the second suction force acts on the diaphragm 3111 to offset a part of the strain recovery force of the diaphragm 3111. Similarly, when the diaphragm assembly 31 is below the initial position, the direction of the strain recovery force of the diaphragm 3111 is upward. At this time, the first suction force between the magnetic material coating 312 and the auxiliary magnet 411 is upward, and the second suction force between the magnetic material coating 312 and the magnetic circuit system 2 is downward, and the second suction force is greater than the first suction force. The combined force of the first suction force and the second suction force is less than the strain recovery force of the diaphragm 3111 and is directed downward. Therefore, the combined force of the first suction force and the second suction force acts on the diaphragm 3111 to offset part of the strain recovery force of the diaphragm 3111.

[0103] In summary, when the vibration system 3 is working, the resultant force of the first suction force and the second suction force is opposite to the direction of the strain recovery force of the diaphragm 3111 of the diaphragm assembly 31 and is smaller than the strain recovery force of the diaphragm 3111 of the diaphragm assembly 31. When the vibration system 3 stops working, the equivalent stiffness of the resultant force of the first suction force and the second suction force is not greater than the stiffness of the diaphragm 3111 of the diaphragm assembly 31.

[0104] Specifically, when the sound unit 100 is in a non-working state, the vibration system 3 is in a balanced position, and the equivalent stiffness of the resultant force of the first suction force between the magnetic material coating 312 of the diaphragm assembly 31 and the auxiliary magnet 411 and the second suction force between the magnetic material coating 312 of the diaphragm assembly 31 and the magnetic circuit system 2 is not greater than the stiffness of the diaphragm 3111. That is to say, in a non-working state, when the vibration system 3 is in a balanced position, the resultant force of the first suction force between the magnetic material coating 312 of the diaphragm assembly 31 and the auxiliary magnet 411 and the second suction force between the magnetic material coating 312 of the diaphragm assembly 31 and the magnetic circuit system 2 cannot drive the diaphragm assembly 31 to vibrate, thereby avoiding the influence of the static magnetic force on the balanced position of the vibration system 3 when the sound unit 100 is in a non-working state.

[0105] It should be noted that the force exerted on the vibration system 3 by the first suction force between the magnetic material coating 312 of the diaphragm assembly 31 and the auxiliary magnet 411 and the second suction force between the diaphragm assembly 31 and the magnetic circuit system 2 is not fixed. The greater the distance that the vibration system 3 deviates from its equilibrium position, the greater the force exerted on the vibration system 3 by the first suction force between the diaphragm assembly 31 and the auxiliary magnet 411 and the second suction force between the diaphragm assembly 31 and the magnetic circuit system 2. The smaller the distance that the vibration system 3 deviates from its equilibrium position, the smaller the force exerted on the vibration system 3 by the first suction force between the diaphragm assembly 31 and the auxiliary magnet 411 and the second suction force between the diaphragm assembly 31 and the magnetic circuit system 2. The static magnetic force is manifested as follows: Fig.16 shown.

[0106] Specifically, the system stiffness Kms consists of two parts: the vibration system stiffness Km and the cavity stiffness Kb, that is, Kms=Km+Kb. Taking into account that the static magnetic force is related to the position of the diaphragm assembly 31, similar to the system stiffness Kms, the stiffness generated by the static magnetic force is defined as Kt, Kt=static magnetic force / displacement in the vibration direction. At this time, the total stiffness of the system becomes: Kms=Km+Kb-Kt, where Kms is the system stiffness, Km is the vibration system 3 stiffness, and Kb is the cavity stiffness. At this time, as the displacement increases, the stiffness generated by the static magnetic force increases and the system stiffness decreases, that is, the larger the amplitude, the "softer" the system is, and it "matches" the trend of the BL(x) curve, and the low-frequency performance is higher, such as Fig.17 and Fig.18 shown.

[0107] The sound module 500 of the present invention is configured by configuring the module shell 400 to be a connected module upper shell 410 and a module lower shell 420, so that at least a portion of the module upper shell 410 is located on the side of the diaphragm assembly 31 of the sound unit 100 that is away from the magnetic circuit system 2, and the diaphragm assembly 31 is configured to be a main body 311 and a magnetic material coating 312 provided on the main body 311, and an auxiliary magnet 411 is provided on the module upper shell 410, so that the magnetization direction of the auxiliary magnet 411 is opposite to the magnetization direction of the central magnetic part 22, so that there is a first suction force between the diaphragm assembly 31 and the auxiliary magnet 411, and there is a second suction force between the diaphragm assembly 31 and the magnetic circuit system 2, and the magnetic material coating 312 is used to interact with the auxiliary magnet 411 of the module upper shell 410 and the magnetic circuit system 2 respectively, so as to introduce static magnetic force into the vibration system 3, thereby effectively reducing the strain recovery force of the diaphragm assembly 31 during movement.

[0108] It can be understood that by providing the magnetic material coating 312 and the auxiliary magnet 411, a static magnetic force is introduced into the vibration system 3, so that when the vibration system 3 is working, the combined force of the first suction force and the second suction force is opposite to the direction of the strain recovery force of the diaphragm assembly 31 and is smaller than the strain recovery force of the diaphragm assembly 31; when the vibration system 3 stops working, the equivalent stiffness of the combined force of the first suction force and the second suction force is not greater than the stiffness of the diaphragm assembly 31, and the stiffness of the vibration system 3 is reduced by the static magnetic force, so that the compliance of the diaphragm assembly 31 is better, thereby greatly improving the low-frequency effect of the sound module 500.

[0109] In one embodiment, the magnetic material coating 312 is disposed on the side of the main body 311 facing the module upper shell 410; and / or, the magnetic material coating 312 is disposed on the side of the main body 311 facing the central magnetic part 22; and / or, the main body 311 is provided with a fixed cavity, and the magnetic material coating 312 is disposed in the fixed cavity.

[0110] In this embodiment, the magnetic material coating 312 can be disposed on at least one side of the body 311, that is, the magnetic material coating 312 can be disposed on one side or two opposite sides of the body 311. In this embodiment, the body 311 has a first surface 3115 and a second surface 3116 disposed opposite to each other and a peripheral side surface 3117 connecting the first surface 3115 and the second surface 3116, and the first surface 3115 faces the module upper shell 410. At this time, the magnetic material coating 312 can be disposed on the first surface 3115, such as Figures 3 to 6 , Fig.10 , Fig.11 As shown; the magnetic material coating 312 may also be disposed on the second surface 3116, such as Figure 8 As shown; the magnetic material coating 312 can also be disposed on the first surface 3115 and the second surface 3116 at the same time, such as Fig. 9 , Fig.12 and Fig.13 shown.

[0111] Of course, the magnetic material coating 312 can also be disposed in the body 311, that is, the magnetic material coating 312 is embedded in the body 311 or injection molded in the body 311. In one embodiment, a fixed cavity is provided in the body 311, and the magnetic material coating 312 is disposed in the fixed cavity. Figure 7 shown.

[0112] Optionally, the magnetic material coating 312 is disposed on the side of the spherical top 3113 facing the module upper shell 410; and / or, the magnetic material coating 312 is disposed on the side of the spherical top 3113 facing the central magnetic part 22; and / or, the spherical top 3113 is provided with a fixed cavity, and the magnetic material coating 312 is disposed in the fixed cavity.

[0113] Alternatively, if Figure 3 , Figure 4 , Figures 9 to 12 As shown, the magnetic material coating 312 covers at least a portion of the first surface 3115. Optionally, as Figure 8 , Fig. 9 , Fig.12 As shown, the magnetic material coating 312 covers at least a portion of the second surface 3116. Optionally, as Fig.14 As shown, the magnetic material coating 312 covers the first surface 3115 and the surrounding side surface 3117. Optionally, the magnetic material coating 312 covers the second surface 3116 and the surrounding side surface 3117. Optionally, as Fig.13 As shown, the magnetic material coating 312 covers the first surface 3115 , the peripheral side surface 3117 and the second surface 3116 , which is not limited here.

[0114] In this embodiment, if Fig.15 As shown, the magnetic material coating 312 can be made of a mixture of magnetic conductive material particles and adhesives, and the mixture is bonded to the spherical top 3113 of the body 311. Of course, the magnetic material coating 312 can also be made of any soft magnetic material, such as pure iron, nickel, alloy, etc.; permanent magnetic materials with magnetism themselves, such as ferrite, precious metal alloy, etc. can also be used. It should be noted that when the magnetic material coating 312 uses a permanent magnet, it is necessary to ensure that the magnetic material coating 312 does not generate a mutually repulsive force on the auxiliary magnet 411 and the magnetic circuit system 2.

[0115] It can be understood that the magnetic material coating 312 is arranged on the spherical top 3113 of the main body 311 and is located between the auxiliary magnet 411 and the magnetic circuit system 2, so that the magnetic material coating 312 can vibrate back and forth between the auxiliary magnet 411 and the magnetic circuit system 2 within the effective vibration range of the vibration system 3.

[0116] It should be noted that the magnetic material coating 312 is attracted by the auxiliary magnet 411 and the magnetic circuit system 2 at the same time, and the directions of the two attractions are opposite. When the magnetic material coating 312 approaches the auxiliary magnet 411 / magnetic circuit system 2, the attraction between it and the auxiliary magnet 411 / magnetic circuit system 2 becomes larger, and the attraction between it and the other magnetic circuit system 2 / auxiliary magnet 411 becomes smaller. The total attraction to the magnetic material coating 312 is the force applied to the vibration system 3.

[0117] Optionally, the magnetic material coating 312 can be located in the middle of the auxiliary magnet 411 and the magnetic circuit system 2, or can be set at a position deviated from the center of the auxiliary magnet 411 and the magnetic circuit system 2. It is ensured that when the vibration system 3 is in a balanced position, the attraction of the auxiliary magnet 411 to the magnetic material coating 312 is equal to the attraction of the magnetic circuit system 2. Under this design, the size of the magnetic material coating 312 can be optimized to ensure that the magnetic material coating 312 can be installed on the spherical top 3113 of the body 311. Of course, if necessary, the magnetic material coating 312 can be set in the spherical top 3113 of the body 311 to ensure that the total attraction of the two magnetic regions to the magnetic material coating 312 is 0 when the magnetic material coating 312 is in a balanced position.

[0118] In one embodiment, if Fig.15 As shown, the magnetic material coating 312 includes a coating layer 3121 and a magnetic powder 3122. It can be understood that the magnetic powder 3122 is doped or mixed in the coating layer 3121. Optionally, the magnetic powder 3122 is at least one of iron powder, nickel powder, manganese zinc ferrite powder, nickel zinc ferrite powder, neodymium iron boron powder, aluminum iron boron powder, iron silicon powder, and iron silicon aluminum powder, which is not limited here.

[0119] In one embodiment, the magnetic material coating 312 includes a plurality of coatings. It is understood that the plurality of coatings 312 may be disposed on the same side of the body 311 at the same time; or, the plurality of coatings 312 may be disposed on different sides of the body 311 at the same time. For example, the plurality of coatings 312 may be disposed on the first surface 3115 or the second surface 3116 of the body 311 at the same time; or, the plurality of coatings 312 may be disposed on the first surface 3115 and the second surface 3116 of the body 311 at the same time, which is not limited here.

[0120] It can be understood that when multiple magnetic material coatings 312 are arranged on the same side of the body 311, the multiple magnetic material coatings 312 are arranged in a spliced ​​manner. For example, two adjacent magnetic material coatings 312 in the multiple magnetic material coatings 312 are arranged closely together, that is, there is no gap. When multiple magnetic material coatings 312 are arranged on the same side of the body 311, the multiple magnetic material coatings 312 are arranged at intervals. For example, there is a gap between two adjacent magnetic material coatings 312 in the multiple magnetic material coatings 312.

[0121] Optionally, the magnetic material coating 312 is circular, elliptical or polygonal. That is, the shape of the magnetic material coating 312 can be a polygonal structure such as a circle, an ellipse, a triangle, a square, etc., which is not limited here. In order to ensure the balance of the magnetic attraction between the auxiliary magnet 411 and the magnetic material coating 312, the structure of the magnetic material coating 312 can be a symmetrical structure or a regular structure, which is not limited here.

[0122] In this embodiment, the auxiliary magnet 411 and the magnetic material coating 312 are optionally arranged in a face-to-face relationship. It can be understood that such an arrangement can ensure the magnetic attraction between the auxiliary magnet 411 and the magnetic material coating 312. In order to further ensure the balance of the vibration system 3 of the sound-emitting unit 100, the central axis of the magnetic material coating 312 can optionally coincide with the central axis of the sound-emitting unit 100.

[0123] In one embodiment, the body 311 includes a diaphragm 3111 and a dome 3113, the diaphragm 3111 is provided with an inner ring hole 3112, the dome 3113 is covered with the inner ring hole 3112, and the magnetic material coating 312 is provided on the dome 3113. Optionally, the dome 3113 is provided with a fixing groove 3114, and the magnetic material coating 312 is provided in the fixing groove 3114.

[0124] In this embodiment, if Figures 3 to 10 As shown, the diaphragm 3111 is provided with an inner ring hole 3112, the ball top 3113 is covered in the inner ring hole 3112, and the ball top 3113 is provided with a fixing groove 3114. Optionally, the fixing groove 3114 is formed by the side of the ball top 3113 facing away from the central magnetic part 22 and concave toward the direction close to the central magnetic part 22.

[0125] It can be understood that the fixing groove 3114 can be a groove structure recessed in the ball top 3113. The fixing groove 3114 can be formed by the side of the ball top 3113 facing away from the central magnetic part 22 being recessed toward the central magnetic part 22; or, the fixing groove 3114 can be formed by the side of the ball top 3113 facing the central magnetic part 22 being recessed toward the module upper shell 410, which is not limited here.

[0126] In one embodiment, the central magnetic portion 22 includes a central magnet 221 and a central magnetic conductive plate 222 which are stacked. The central magnet 221 is connected to the magnetic conductive yoke 21 , and the central magnetic conductive plate 222 has a recessed area 223 corresponding to the magnetic material coating 312 .

[0127] In this embodiment, if Figures 3 to 10 As shown, the central magnetic part 22 includes one or more central magnets 221 and a central magnetic plate 222, and the central magnet 221 and the central magnetic plate 222 are stacked. When the central magnet 221 and the central magnetic plate 222 are both multiple, the multiple central magnets 221 and the multiple central magnetic plates 222 are alternately stacked, and one central magnet 221 is connected to the magnetic yoke 21. When the central magnet 221 and the central magnetic plate 222 are each one, the central magnet 221 is sandwiched between the central magnetic plate 222 and the magnetic yoke 21.

[0128] Optionally, the central magnetic portion 22 may be provided in an annular structure, so that a through-hole structure is formed in the center of the central magnetic portion 22. Of course, in other embodiments, the central magnetic portion 22 includes a plurality of bar structures, and the plurality of bar structures are enclosed to form an annular structure, so that the plurality of bar structures are enclosed to form a through-hole structure, which is not limited here. Alternatively, the central magnetic portion 22 is a square plate-like structure, which is not limited here.

[0129] It can be understood that the central magnetic conductive plate 222 is arranged in an integral ring shape, so that a recessed area 223 is formed in the center of the central magnetic conductive plate 222. Of course, in other embodiments, the central magnetic conductive plate 222 includes multiple central magnetic conductive plates 222, and multiple central magnetic conductive plates 222 are enclosed in an annular shape to form the recessed area 223; or, the central magnetic conductive plate 222 is a plate-like structure, which is not limited here. Optionally, the central magnet 221 is optionally arranged in an annular shape, that is, the central magnet 221 is arranged in an integral ring shape, so that a second through hole is formed in the center of the central magnet 221. Of course, in other embodiments, the central magnet 221 includes multiple central magnets 221, and multiple central magnets 221 are enclosed in an annular shape to form a second through hole; or, the central magnet 221 is a plate-like structure, which is not limited here.

[0130] In this embodiment, by providing a recessed area 223 on the central magnetic plate 222 of the central magnetic portion 22, the influence of the magnetic focusing effect of the central magnetic plate 222 on the second suction force can be reduced, thereby effectively increasing the magnetic attraction between the magnetic material coating 312 of the diaphragm assembly 31 and the central magnet 221. It can be understood that the provision of the recessed area 223 is also conducive to avoiding the fixing groove 3114 of the ball top 3113. Optionally, part of the central magnetic plate 222 is recessed in a direction away from the diaphragm assembly 31 to form the recessed area 223. Of course, in other embodiments, the recessed area 223 is a through-hole structure that penetrates the central magnetic plate 222.

[0131] It is understandable that the recessed area 223 may be a through hole or a notch structure penetrating the central magnetic conductive plate 222. Of course, the recessed area 223 may also be a groove structure formed by the central magnetic conductive plate 222 being recessed in a direction away from the diaphragm assembly 31, which is not limited here.

[0132] In one embodiment, the recessed area 223 is a through hole, and the central magnet 221 is provided with a protruding portion 224 corresponding to the through hole, and the protruding portion 224 is located in the through hole.

[0133] In this embodiment, if Fig.10As shown, by providing a protrusion 224 on the central magnet 221, the protrusion 224 is located in the through hole, which can effectively increase the magnetic attraction between the central magnet 221 and the magnetic material coating 312. It can be understood that in order to prevent the protrusion 224 of the central magnet 221 from affecting the vibration of the fixing groove 3114 of the ball top 3113 when the diaphragm 3111 vibrates, optionally, the end surface of one side of the protrusion 224 facing the diaphragm 3111 does not exceed the end surface of one side of the central magnetic conductive plate 222 facing the diaphragm 3111, which effectively avoids the fixing groove 3114 of the ball top 3113. Optionally, the recessed area 223 is provided corresponding to the fixing groove 3114, which is not limited here.

[0134] In one embodiment, the edge magnet portion 23 includes an edge magnet and an edge magnetic conductive plate disposed on the edge magnet. Figures 3 to 10 As shown, the side magnets and the side magnetic plates of the side magnetic part 23 are stacked on the magnetic yoke 21, and the side magnets are connected to the magnetic yoke 21. The side magnets and the side magnetic plates of the side magnetic part 23 are located outside the central magnetic part 22 and are spaced to form a magnetic gap 24.

[0135] In one embodiment, the edge magnet portion 23 may be arranged in an annular shape, in which case the annular edge magnet portion 23 is located outside the central magnet portion 22 and is spaced apart from the central magnet portion 22 to form a magnetic gap 24. Optionally, the edge magnet and / or the edge magnetic plate form a closed integral annular structure.

[0136] Of course, in other embodiments, the edge magnetic part 23 includes a plurality of edge magnetic parts 23, which are arranged around the outside of the central magnetic part 22 and are spaced apart from the central magnetic part 22 to form a magnetic gap 24. Optionally, there are multiple edge magnets and edge magnetic conductive plates, which are arranged one by one, and adjacent edge magnets are connected end to end to form a closed annular structure. Alternatively, the edge magnets form a closed integral annular structure, there are multiple edge magnetic conductive plates, adjacent edge magnetic conductive plates are connected end to end to form a closed annular structure, and are arranged corresponding to the annular edge magnets; or, the edge magnetic conductive plates form a closed integral annular structure, there are multiple edge magnets, adjacent edge magnets are connected end to end to form a closed annular structure, and are arranged corresponding to the annular edge magnetic conductive plates, which are not limited here.

[0137] It should be noted that, in order to facilitate the installation of the centering support piece 33, multiple side magnets 23 are arranged around the outside of the central magnet part 22, and a gap is provided between two adjacent side magnets 23 for avoiding the centering support piece 33, which is not limited here.

[0138] In one embodiment, a positioning column is provided on the periphery of one side of the housing 1 facing away from the diaphragm assembly 31, and a positioning notch is provided on the magnetic yoke 21 corresponding to the positioning column, and the positioning column is positioned and matched with the positioning notch. It can be understood that by providing a positioning column on the housing 1 and forming a positioning notch on the magnetic yoke 21 to be positioned and matched with the positioning column, the positioning and installation of the magnetic circuit system 2 can be achieved, thereby improving the convenience and accuracy of installation.

[0139] In this embodiment, if Figures 3 to 10 As shown, the edge magnetic part 23 includes a stacked edge magnet and an edge magnetic conductive plate, the edge magnet is sandwiched between the edge magnetic conductive plate and the magnetic conductive yoke 21, and the edge magnetic conductive plate is connected to the housing 1. Optionally, the edge magnetic conductive plate and the housing 1 are an integrally formed structure, which can simplify the structure and improve the installation stability.

[0140] In one embodiment, the centering support plates 33 include a plurality of centering support plates 33, one ends of the plurality of centering support plates 33 are respectively connected to the voice coil 32, and are respectively electrically connected to the leads of the voice coil 32, and the other ends of the plurality of centering support plates 33 are respectively connected to the housing 1, thereby improving the operating stability of the vibration system 3.

[0141] Optionally, multiple centering supports 33 are correspondingly distributed along the long axis direction and / or short axis direction of the magnetic circuit system 2 and / or the diagonal or four corner positions of the magnetic circuit system 2. It can be understood that multiple centering supports 33 can be symmetrically distributed along the long axis direction of the magnetic circuit system 2; multiple centering supports 33 can also be symmetrically distributed along the short axis direction of the magnetic circuit system 2; multiple centering supports 33 can also be correspondingly arranged at the diagonal positions of the magnetic circuit system 2; multiple centering supports 33 can also be correspondingly arranged at the four corner positions of the magnetic circuit system 2. Of course, in other embodiments, multiple centering supports 33 can be correspondingly distributed along the long axis direction of the magnetic circuit system 2, the short axis direction of the magnetic circuit system 2, and the diagonal or four corner positions of the magnetic circuit system 2, which is not limited here.

[0142] Optionally, the centering support plates 33 include two or four. Such an arrangement can not only utilize the centering support plates 33 to connect the voice coil 32 to the external circuit, but also ensure the vibration balance of the sound unit 100.

[0143] It can be understood that when there are two centering supports 33, the two centering supports 33 are arranged at intervals along the long axis direction of the magnetic circuit system 2; or, the two centering supports 33 are arranged at intervals along the short axis direction of the magnetic circuit system 2, which is not limited here. Of course, when there are four centering supports 33, the four centering supports 33 can also be arranged correspondingly along the four corners of the magnetic circuit system 2. The present invention does not specifically limit the arrangement of the centering supports 33.

[0144] In one embodiment, each centering support 33 includes a first connection portion, an elastic arm, and a second connection portion connected in sequence, the first connection portion is connected to the voice coil 32 and electrically connected to the lead of the voice coil 32 , and the second connection portion is connected to the housing 1 .

[0145] In this embodiment, if Figure 3 As shown, the first connection portion, the elastic arm and the second connection portion of the centering support 33 can be an integrally formed structure. This can effectively ensure the structural strength of the centering support 33 and simplify the processing steps of the centering support 33. It can be understood that in order to ensure the deformation ability of the centering support 33, the elastic arm has at least one bend.

[0146] In one embodiment, if Figure 3 As shown, the first connection portion, the elastic arm and the second connection portion of the centering support 33 may be located in the same plane. Of course, in other embodiments, the first connection portion and the second connection portion of the centering support 33 may also be located in different planes. It can be understood that the centering support 33 is used to connect the external circuit to the voice coil 32, and the centering support 33 can also be used to effectively prevent the voice coil 32 from swinging or polarizing during vibration.

[0147] In one embodiment, the module upper shell 410 cooperates with the sound unit 100 to form a front sound cavity 430, and the module shell 400 is provided with a sound outlet hole 413 connected to the front sound cavity 430; wherein, the auxiliary magnet 411 is arranged on the side of the module upper shell 410 facing the front sound cavity 430; and / or, the auxiliary magnet 411 is arranged on the side of the module upper shell 410 facing away from the front sound cavity 430; and / or, the module upper shell 410 is provided with an installation cavity, and the auxiliary magnet 411 is arranged in the installation cavity.

[0148] In this embodiment, the position where the auxiliary magnet 411 is set on the upper shell 410 of the module is spaced from the diaphragm assembly 31, that is, a front sound cavity 430 is formed between the upper shell 410 of the module and the diaphragm assembly 31. It can be understood that the upper shell 410 of the module can optionally be in an inverted U-shape or a pot cover or a hat structure, which is not limited here. It should be noted that the structure of the upper shell 410 of the module is not limited to the above-mentioned structural form, and can also be other structural design forms, as long as it can support and fix the auxiliary magnet 411, which is not limited here.

[0149] It is understandable that the module upper shell 410 can be made of metal, plastic, or injection molded from metal and plastic, which is not limited here. Optionally, the auxiliary magnet 411 is bonded to the module upper shell 410. For example, the auxiliary magnet 411 can be fixed to the module upper shell 410 by bonding with an adhesive layer. Of course, in other embodiments, the auxiliary magnet 411 can also be welded to the module upper shell 410, for example, the auxiliary magnet 411 can be fixed to the module upper shell 410 by soldering, which is not limited here.

[0150] In order to facilitate the processing of the module upper shell 410 and improve the connection strength between the module upper shell 410 and the auxiliary magnet 411, the auxiliary magnet 411 is optionally integrally injection molded with the module upper shell 410. In this embodiment, the auxiliary magnet 411 is optionally made of a magnetic conductive material. Optionally, the auxiliary magnet 411 is a magnet.

[0151] In one embodiment, the auxiliary magnet 411 is disposed on the side of the module upper shell 410 facing the diaphragm assembly 31; and / or, the auxiliary magnet 411 is disposed on the side of the module upper shell 410 facing away from the diaphragm assembly 31; and / or, the module upper shell 410 is provided with an installation cavity, and the auxiliary magnet 411 is disposed in the installation cavity.

[0152] It can be understood that the auxiliary magnet 411 can be arranged on at least one side of the module upper shell 410, that is, the auxiliary magnet 411 can be arranged on one side or two opposite sides of the module upper shell 410. In this embodiment, the module upper shell 410 has an upper surface and a lower surface arranged opposite to each other, and the lower surface faces the diaphragm assembly 31. In this case, the auxiliary magnet 411 can be arranged on the upper surface; the auxiliary magnet 411 can also be arranged on the lower surface, such as Figure 5 , Figure 6 As shown; the auxiliary magnet 411 can also be arranged on the upper surface and the lower surface at the same time.

[0153] Of course, the auxiliary magnet 411 can also be disposed in the module upper shell 410, that is, the auxiliary magnet 411 is embedded in the module upper shell 410 or injection molded in the module upper shell 410. In one embodiment, the module upper shell 410 is provided with an installation cavity, and the auxiliary magnet 411 is disposed in the installation cavity.

[0154] In one embodiment, the auxiliary magnet 411 includes a plurality of auxiliary magnets. It is understandable that the plurality of auxiliary magnets 411 can be simultaneously disposed on the same side of the module upper shell 410; or, the plurality of auxiliary magnets 411 can be simultaneously disposed on different sides of the module upper shell 410. For example, the plurality of auxiliary magnets 411 can be simultaneously disposed on the upper surface or the lower surface of the module upper shell 410; or, the plurality of auxiliary magnets 411 can be simultaneously disposed on the upper surface and the lower surface of the module upper shell 410, which is not limited here.

[0155] It is understandable that when multiple auxiliary magnets 411 are arranged on the same side of the module upper shell 410, the multiple auxiliary magnets 411 are arranged in a spliced ​​manner. For example, two adjacent auxiliary magnets 411 among the multiple auxiliary magnets 411 are arranged closely together, that is, there is no gap. When multiple auxiliary magnets 411 are arranged on the same side of the module upper shell 410, the multiple auxiliary magnets 411 are arranged at intervals. For example, there is a gap between two adjacent auxiliary magnets 411 among the multiple auxiliary magnets 411.

[0156] Optionally, the auxiliary magnet 411 is circular, elliptical or polygonal. That is, the shape of the auxiliary magnet 411 can be a polygonal structure such as a circle, an ellipse, a triangle, a square, etc., which is not limited here. In order to ensure the balance of the magnetic attraction between the auxiliary magnet 411 and the magnetic material coating 312 of the diaphragm assembly 31, the structure of the auxiliary magnet 411 can be a symmetrical structure or a regular structure, which is not limited here.

[0157] In this embodiment, the auxiliary magnet 411 and the magnetic material coating 312 are optionally arranged in a face-to-face relationship. It can be understood that such an arrangement can ensure the magnetic attraction between the auxiliary magnet 411 and the magnetic material coating 312. In order to further ensure the balance of the vibration system 3 of the sound unit 100, the central axis of the auxiliary magnet 411 can optionally coincide with the central axis of the sound module 500. Optionally, the central axis of the auxiliary magnet 411 can optionally coincide with the central axis of the sound unit 100. Optionally, the auxiliary magnet 411 is a magnet.

[0158] In one embodiment, if Figure 6 As shown, a mounting groove 414 is provided on one side of the module upper shell 410 facing the diaphragm assembly 31 , and the auxiliary magnet 411 is disposed in the mounting groove 414 .

[0159] In this embodiment, the mounting groove 414 can be a groove structure formed by a concave surface of one side of the module upper shell 410, or a concave structure formed by a concave surface of one side of the module upper shell 410 toward the other side surface, so that the other side surface is convex, which is not limited here. It can be understood that the mounting groove 414 can be set on the lower surface of the module upper shell 410. Of course, in other embodiments, the mounting groove 414 can be set on the upper surface of the module upper shell 410, which is not limited here.

[0160] In one embodiment, the sound module 500 further includes a flexible circuit board, one end of the flexible circuit board is electrically connected to the sound unit 100, and the other end of the flexible circuit board is used to connect to an external power source.

[0161] It can be understood that the flexible circuit board is used to connect the external circuit to the sound unit 100. The flexible circuit board is provided with an inner pad and an outer pad. The inner pad of the flexible circuit board is connected to the sound unit 100, and the outer pad of the flexible circuit board is used to connect to the external terminal. In this embodiment, at least one end of the flexible circuit board connected to the sound unit 100 is located in the installation space 421 of the module housing 400. Of course, in other embodiments, the flexible circuit board can also be entirely arranged in the installation space 421 of the module housing 400, which is not limited here.

[0162] The present invention further provides an electronic device, which includes the above-mentioned sound module 500. The specific structure of the sound module 500 refers to the above-mentioned embodiment. Since the electronic device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0163] In one embodiment, the electronic device further includes a device housing, and the sound module 500 is disposed in the device housing. In this embodiment, the device housing has a cavity, and the sound unit 100 is disposed in the cavity of the device housing. It can be understood that the electronic device can be a headset, a mobile phone, a computer, a tablet computer, a smart wearable device, etc., which is not limited here. Of course, the electronic device can also be an MP3, MP4, a wearable device, etc., which are not listed one by one here.

[0164] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sound module, characterized in that: The sound module comprises: A module housing, wherein an installation space is provided in the module housing, and the module housing comprises a module upper shell and a module lower shell connected to each other; and A sound-generating unit, the sound-generating unit comprising a magnetic circuit system and a vibration system arranged in the installation space, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion and a side magnetic portion arranged on the magnetic yoke, the central magnetic portion and the side magnetic portion being spaced apart to form a magnetic gap, the vibration system being arranged on one side of the magnetic circuit system, the vibration system comprising a diaphragm assembly and a voice coil connected to the diaphragm assembly, the end of the voice coil away from the diaphragm assembly being arranged corresponding to the magnetic gap, the diaphragm assembly comprising a body and a magnetic material coating arranged on the body, the module upper shell being located on the side of the diaphragm assembly facing away from the magnetic circuit system, the module upper shell being provided with an auxiliary magnet, the magnetizing direction of the auxiliary magnet being opposite to the magnetizing direction of the central magnetic portion; There is a first suction force between the diaphragm assembly and the auxiliary magnet, and a second suction force between the diaphragm assembly and the magnetic circuit system. When not in operation, the vibration system is located at a balanced position between the auxiliary magnet and the magnetic circuit system under the combined force of the first suction force and the second suction force.

2. The sound module according to claim 1, characterized in that: The magnetic material coating is disposed on a side of the body facing the upper shell of the module; And / or, the magnetic material coating is provided on a side of the body facing the central magnetic portion; And / or, the main body is provided with a fixed cavity, and the magnetic material coating is provided in the fixed cavity.

3. The sound module according to claim 1, characterized in that: The magnetic material coating comprises a coating layer and magnetic powder, wherein the magnetic powder is doped or mixed in the coating layer; The magnetic powder is at least one of iron powder, nickel powder, manganese zinc ferrite powder, nickel zinc ferrite powder, neodymium iron boron powder, aluminum iron boron powder, iron silicon powder and sendust aluminum powder.

4. The sound module according to claim 1, characterized in that: The magnetic material coating comprises a plurality of coatings; the plurality of coatings are arranged on the same side and / or different sides of the body; and / or the plurality of coatings are arranged in a spliced ​​manner or in an interval manner; And / or, the magnetic material coating is circular, elliptical or polygonal; And / or, the central axis of the magnetic material coating coincides with the central axis of the sound-emitting unit.

5. The sound module according to claim 1, characterized in that: The body comprises a first surface and a second surface which are arranged in opposite directions, and a peripheral side surface connecting the first surface and the second surface; The magnetic material coating covers at least a portion of the first surface; and / or, the magnetic material coating covers at least a portion of the second surface; and / or, the magnetic material coating covers the first surface and the peripheral side surface; and / or, the magnetic material coating covers the second surface and the peripheral side surface.

6. The sound module according to claim 1, characterized in that: The body comprises a diaphragm and a spherical top, the diaphragm is provided with an inner ring hole, the spherical top cover is arranged on the inner ring hole, and the magnetic material coating is arranged on the spherical top.

7. The sound module according to claim 6, characterized in that: The ball top is provided with a fixing groove, and the magnetic material coating is arranged in the fixing groove.

8. The sound module according to claim 7, characterized in that: The fixing groove is formed by the side of the ball top facing away from the central magnetic part and concave toward the central magnetic part.

9. The sound module according to claim 1, characterized in that: The central magnetic part includes a central magnet and a central magnetic conductive plate which are stacked. The central magnet is connected to the magnetic conductive yoke. The central magnetic conductive plate is provided with a recessed area corresponding to the magnetic material coating.

10. The sound module according to claim 9, characterized in that: Part of the central magnetic conductive plate is recessed in a direction away from the diaphragm assembly to form the recessed area; Alternatively, the recessed area is a through hole structure penetrating the central magnetic conductive plate.

11. The sound module according to claim 9, characterized in that: The recessed area is a through hole, and the central magnet is provided with a protruding portion corresponding to the through hole, and the protruding portion is located in the through hole.

12. The sound module according to claim 1, characterized in that: The module upper shell cooperates with the sound-emitting monomer to form a front sound cavity, and the module shell is provided with a sound outlet hole connected to the front sound cavity; Among them, the auxiliary magnet is arranged on the side of the module upper shell facing the front sound cavity; and / or, the auxiliary magnet is arranged on the side of the module upper shell facing away from the front sound cavity; and / or, the module upper shell is provided with an installation cavity, and the auxiliary magnet is arranged in the installation cavity.

13. The sound module according to claim 1, characterized in that: The auxiliary magnet is bonded or welded to the upper shell of the module; Alternatively, the auxiliary magnet and the module upper shell are integrally injection molded.

14. The sound module according to claim 1, characterized in that: The auxiliary magnets include a plurality of auxiliary magnets; the plurality of auxiliary magnets are arranged on the same side or different sides of the upper shell of the module; and / or the plurality of auxiliary magnets are arranged in a spliced ​​manner or in an interval manner; And / or, the auxiliary magnet is circular, elliptical or polygonal; And / or, the auxiliary magnet is a magnet; And / or, the central axis of the auxiliary magnet coincides with the central axis of the sound-emitting unit; And / or, the auxiliary magnet is arranged opposite to the magnetic material coating; And / or, a mounting groove is provided on a side of the module upper shell facing the diaphragm assembly, and the auxiliary magnet is arranged in the mounting groove.

15. An electronic device, characterized in that: The electronic device comprises a sound module as described in any one of claims 1 to 14.

Images