Sound production monomer and electronic equipment

Abstract

The invention discloses a sound production monomer and electronic equipment, the sound production monomer comprises a magnetic circuit system, a vibration system and a front cover, the vibration system is arranged at one side of the magnetic circuit system, a vibration plate of a vibration diaphragm assembly of the vibration system is provided with a magnetic conductive part, the front cover is arranged at one side, back to the magnetic circuit system, of the vibration diaphragm assembly, and the front cover is provided with an auxiliary magnet. The magnetizing direction of the auxiliary magnet is opposite to that of the central magnetic part; wherein a first attraction force exists between the magnetic conductive part and the auxiliary magnet, a second attraction force exists between the magnetic conductive part and the magnetic circuit system, and in a non-working state, the vibration 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 conductive part 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 monomer is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducer, and in particular to a sound-generating unit and an electronic device using the sound-generating unit. 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 unit and an electronic device, which aims to introduce static magnetic force into the vibration system by setting a magnetic conductive part 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 unit.

[0006] To achieve the above object, the present invention provides a sound-emitting unit, the sound-emitting unit comprising:

[0007] A magnetic circuit system, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion and a side magnetic portion arranged on the magnetic yoke, wherein the central magnetic portion and the side magnetic portion are spaced apart to form a magnetic gap;

[0008] a vibration system, the vibration system being arranged at 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 diaphragm and a vibration plate arranged on the diaphragm, the vibration plate having a magnetic conductive portion; and

[0009] A front cover, the front cover is arranged on a side of the diaphragm assembly facing away from the magnetic circuit system, the front cover is provided with an auxiliary magnet, and a magnetization direction of the auxiliary magnet is opposite to a magnetization direction of the central magnetic part;

[0010] There is a first attraction between the magnetic conductive part and the auxiliary magnet, and a second attraction between the magnetic conductive part 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 attraction and the second attraction.

[0011] In one embodiment, the magnetic conductive portion is bonded to the vibration plate;

[0012] Or, the magnetic conductive part and the vibration plate are integrally injection molded;

[0013] Alternatively, the vibration plate is made of a magnetic conductive material, and the vibration plate is formed as the magnetic conductive portion.

[0014] In one embodiment, the magnetic conductive portion is disposed on a side of the vibration plate facing the front cover;

[0015] And / or, the magnetic conductive portion is arranged on a side of the vibration plate facing the central magnetic portion;

[0016] And / or, the vibration plate is provided with a fixed cavity, and the magnetic conductive part is arranged in the fixed cavity.

[0017] In one embodiment, the magnetic conductive parts include a plurality of parts; the plurality of magnetic conductive parts are arranged on the same side and / or different sides of the diaphragm assembly; and / or the plurality of magnetic conductive parts are arranged in a spliced ​​manner or in an interval manner;

[0018] And / or, the magnetic conductive portion is circular, elliptical or polygonal;

[0019] And / or, the central axis of the magnetic conductive portion coincides with the central axis of the sound-emitting unit;

[0020] And / or, the magnetic conductive part is a magnetic conductive plate, and the material of the magnetic conductive plate is SPCC or SUS430.

[0021] In one embodiment, the central magnetic portion includes a stacked central magnet and a central magnetic conductive plate, 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 conductive portion.

[0022] 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;

[0023] Alternatively, the recessed area is a through hole structure penetrating the central magnetic conductive plate.

[0024] 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.

[0025] In one embodiment, an end surface of the protrusion facing the diaphragm does not exceed an end surface of the central magnetic conductive plate facing the diaphragm.

[0026] In one embodiment, the diaphragm is provided with an inner ring hole, the vibration plate cover is arranged on the inner ring hole, the side of the vibration plate facing away from the central magnetic part is recessed toward the direction close to the central magnetic part to form a fixing groove, and the magnetic conductive part is arranged in the fixing groove.

[0027] In one embodiment, the periphery of the front cover is connected to the periphery of the diaphragm so that a vibration space is formed between the front cover and the diaphragm assembly, and the front cover is further provided with a sound hole, and the sound hole is connected to the vibration space;

[0028] The sound-emitting unit further includes a mesh cloth, and the mesh cloth covers the sound hole.

[0029] In one embodiment, the sound holes include a plurality of sound holes, and the plurality of sound holes are arranged around the auxiliary magnet.

[0030] In one embodiment, the auxiliary magnet is bonded to the front cover;

[0031] Alternatively, the auxiliary magnet and the front cover are integrally injection molded.

[0032] In one embodiment, the auxiliary magnet is disposed on a side of the front cover facing the diaphragm assembly;

[0033] And / or, the auxiliary magnet is arranged on a side of the front cover facing away from the diaphragm assembly;

[0034] And / or, the front cover is provided with a mounting cavity, and the auxiliary magnet is arranged in the mounting cavity.

[0035] 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 front cover; and / or the plurality of auxiliary magnets are arranged in a spliced ​​manner or in an interval manner;

[0036] And / or, the auxiliary magnet is circular, elliptical or polygonal;

[0037] And / or, the auxiliary magnet is a magnet;

[0038] And / or, the central axis of the auxiliary magnet coincides with the central axis of the sound-emitting unit;

[0039] And / or, the auxiliary magnet and the magnetic conductive part are arranged opposite to each other;

[0040] And / or, a mounting groove is provided on a side of the front cover facing the diaphragm assembly, and the auxiliary magnet is arranged in the mounting groove.

[0041] In one embodiment, the sound unit further includes a shell, the shell is arranged on the periphery of the magnetic circuit system, and the periphery of the diaphragm is clamped between the shell and the front cover.

[0042] The present invention further provides an electronic device, which includes the above-mentioned sound-emitting unit.

[0043] The sound-emitting unit of the technical solution of the present invention arranges the front cover on the side of the diaphragm assembly facing away from the magnetic circuit system, and arranges the diaphragm assembly as a diaphragm and a vibration plate arranged on the diaphragm, and arranges a magnetic conductive part on the vibration plate, and arranges an auxiliary magnet on the front cover, so that the magnetizing direction of the auxiliary magnet is opposite to the magnetizing direction of the central magnetic part, so that there is a first suction force between the magnetic conductive part and the auxiliary magnet, and a second suction force between the magnetic conductive part and the magnetic circuit system. In this way, the magnetic conductive part interacts with the auxiliary magnet of the front cover and the magnetic circuit system respectively, and a static magnetic force is introduced into the vibration system, thereby effectively reducing the strain restoring force of the diaphragm during movement. 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-emitting unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] 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.

[0045] Figure 1 This is a schematic diagram of the structure of a sound-emitting unit in one embodiment of the present invention;

[0046] Figure 2 It is a structural schematic diagram of a sound-emitting unit from another perspective in one embodiment of the present invention;

[0047] Figure 3 It is a schematic diagram of an exploded view of a sound-emitting unit in one embodiment of the present invention;

[0048] Figure 4 It is a partially exploded schematic diagram of a sound-emitting unit in one embodiment of the present invention;

[0049] Figure 5 is a cross-sectional schematic diagram of a sound-emitting unit in one embodiment of the present invention;

[0050] Figure 6 is a cross-sectional schematic diagram of a sound-emitting unit in another embodiment of the present invention;

[0051] Figure 7 It is a cross-sectional schematic diagram of a sound-emitting unit without a front cover in one embodiment of the present invention;

[0052] Figure 8 It is a cross-sectional schematic diagram of a sound-emitting unit without a front cover in another embodiment of the present invention;

[0053] Fig. 9 It is a static magnetostrictive force curve diagram of the vibration direction of the sound-emitting unit in one embodiment of the present invention;

[0054] Fig.10 The stiffness curve diagram of the sound-generating unit of the present invention and the prior art design;

[0055] Fig.11 This is a test chart of the frequency response performance of the sound unit of the present invention and the existing design.

[0056] Description of Figure Numbers:

[0057]

[0058]

[0059] 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

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] The present invention provides a sound unit 100. It is understandable that the sound unit 100 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.

[0065] It should be noted that loudness (sensitivity) is the main performance indicator of the sound unit 100. In theory, the low-frequency loudness of the sound unit 100 is closely related to the maximum amount of air that its diaphragm assembly 31 can push. However, the volume left for the sound unit 100 in smart devices is getting smaller and smaller, making the effective vibration area (Sd) and the back cavity volume of the sound unit 100 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 with the increase of the displacement of the vibration system 3. This results in that although a large vibration space is reserved, at actual low frequencies, even if the PA outputs the driving signal at full amplitude, the displacement of the vibration system 3 still cannot reach X max , which greatly limits the performance of the product.

[0066] Considering that Sd is limited under given physical space constraints, the improvement of 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 unit 100 to achieve a significant improvement in low frequency. In the present invention, a static magnetic force is introduced into the vibration system 3 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.

[0067] Please refer to Figures 1 to 8As shown, in the embodiment of the present invention, the sound unit 100 includes a magnetic circuit system 2, a vibration system 3 and a front cover 4, 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 end of the voice coil 32 away from the diaphragm assembly 31 is arranged corresponding to the magnetic gap 24, the diaphragm assembly 31 includes a diaphragm 311 and a voice coil 32 arranged on the diaphragm assembly 31 The vibration plate 312 of 311 has a magnetic conductive part 3121. The front cover 4 is arranged on the side of the diaphragm assembly 31 facing away from the magnetic circuit system 2. The front cover 4 is provided with an auxiliary magnet 41. The magnetizing direction of the auxiliary magnet 41 is opposite to the magnetizing direction of the central magnetic part 22. There is a first suction force between the magnetic conductive part 3121 and the auxiliary magnet 41, and there is a second suction force between the magnetic conductive part 3121 and the magnetic circuit system 2. When not working, the vibration system 3 is located at a balanced position between the auxiliary magnet 41 and the magnetic circuit system 2 under the combined force of the first suction force and the second suction force.

[0068] In this embodiment, the sound-emitting unit 100 may be a speaker sound-emitting unit, and the speaker may be a micro speaker. It should be noted that 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 may be arranged in a square shape. For example, the magnetic circuit system 2 may 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 may be connected to the magnetic circuit system 2, or the magnetic circuit system 2 and the vibration system 3 may be respectively assembled on the outer shell or the module shell, etc., which is not limited here.

[0069] 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 1 to 8 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.

[0070] 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.

[0071] It can be understood that the sound unit 100 is used in electronic devices, that is, the sound unit 100 can be installed in the electronic device through the housing 1. It should be noted that the housing 1 of the sound unit 100 can be a housing or box structure independent of the electronic device. In this case, the housing 1 is used to integrate the magnetic circuit system 2 and the vibration system 3 of the sound unit 100 into an integral structure, so as to facilitate disassembly and assembly. Of course, the housing 1 of the sound unit 100 can also be an integrally formed structure with the housing or box structure of the electronic device, which can effectively improve the structural strength and sealing performance.

[0072] In this embodiment, if Figures 1 to 6 As shown, the sound unit 100 also includes a front cover 4, which is arranged on the side of the diaphragm assembly 31 facing away from the magnetic circuit system 2, and the periphery of the front cover 4 is connected to the periphery of the diaphragm assembly 31 to form a vibration space 42 between the front cover 4 and the diaphragm assembly 31, and an auxiliary magnet 41 is arranged on the front cover 4.

[0073] It can be understood that the sound-emitting unit 100 can be selected as a sound-emitting unit used as a receiver, and can be provided in a communication terminal device such as a mobile phone. The front cover 4 of the sound-emitting unit 100 is at least partially located on the side of the diaphragm assembly 31 facing away from the magnetic circuit system 2, so that a vibration space 42 is formed between the front cover 4 and the diaphragm assembly 31. The periphery of the front cover 4 is connected to the periphery of the diaphragm assembly 31, and optionally, the periphery of the diaphragm assembly 31 is sandwiched between the front cover 4 and the housing 1.

[0074] In this embodiment, the housing 1 is disposed at the periphery of the magnetic circuit system 2 , and the periphery of the diaphragm 311 is sandwiched between the housing 1 and the front cover 4 , so that the diaphragm assembly 31 is opposite to and spaced from the magnetic circuit system 2 .

[0075] 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 part 22 and a side magnetic part 23 provided on the magnetic yoke 21, and the magnetic circuit system 2 can be connected to the housing 1 through the periphery of the magnetic yoke 21; or, the magnetic circuit system 2 can be connected to the housing 1 through the side magnetic part 23, which is not limited here. In this embodiment, the side magnetic part 23 is located outside the central magnetic part 22, and is enclosed with the central magnetic part 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.

[0076] It can be understood 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.

[0077] In order to realize the electrical connection between the voice coil 32 and the external circuit. Figures 3 to 8 As shown, the vibration system 3 further includes a centering support plate 33 , one end of the centering support plate 33 is connected to the voice coil 32 , and the other end of the centering support plate 33 is connected to the housing 1 .

[0078] 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.

[0079] In one embodiment, the diaphragm assembly 31 includes a diaphragm 311 and a vibration plate 312 disposed on the diaphragm 311. Optionally, the magnetic conductive portion 3121 is disposed on the vibration plate 312.

[0080] In this embodiment, if Figures 3 to 8 As shown, the 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, and the vibration plate 312 is arranged in the central portion. It can be understood that the fixed portion, the folded ring portion and the central portion of the diaphragm 311 are sequentially connected to form an integrated structure, thereby ensuring the vibration performance and structural strength of the diaphragm 311. Optionally, the folded ring portion of the diaphragm 311 is a convex structure that bulges upward or a concave structure that is concave downward, which is not limited here.

[0081] It can be understood that the vibration plate 312 is arranged at the central part of the diaphragm 311, which can effectively strengthen the structural strength of the central part of the diaphragm 311. By arranging the magnetic conductive part 3121 on the vibration plate 312, the magnetic conductive part 3121 interacts with the auxiliary magnet 41 or the magnetic circuit system 2 to generate static magnetic force, so as to change the stiffness of the diaphragm 311. Optionally, the central part of the diaphragm 311 can be a flat plate structure or a ring structure.

[0082] Optionally, a receiving groove is provided in the central part of the diaphragm 311, and at least a part of the vibration plate 312 is located in the receiving groove. It can be understood that by providing the receiving groove on the side of the diaphragm 311 facing away from the voice coil 32, the vibration plate 312 can be conveniently installed and accommodated in the receiving groove, ensuring that the upper surface of the vibration plate 312 is flush with the upper surface of the diaphragm 311, 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.

[0083] In order to reduce the weight of the diaphragm assembly 31, the diaphragm 311 is provided with an inner ring hole 3111, and the vibration plate 312 is covered in the inner ring hole 3111. In this embodiment, the inner ring hole 3111 is provided in the central part of the diaphragm 311, and the periphery of the vibration plate 312 is connected to the central part. The vibration plate 312 can be connected to the side of the central part of the diaphragm 311 facing the voice coil 32 or the side facing away from the voice coil 32.

[0084] Optionally, a step surface is formed on the periphery of the vibration plate 312, and one side of the diaphragm 311 adjacent to the inner ring hole 3111 is supported and connected to the step surface, and the step surface is located between the voice coil 32 and the diaphragm 311. It can be understood that by providing a step surface on the periphery of the vibration plate 312, the step surface is recessed toward one side of the voice coil 32, thereby ensuring that when the central part of the diaphragm 311 is overlapped and supported on the step surface of the vibration plate 312, the upper surface of the central part of the diaphragm 311 is flush with the upper surface of the vibration plate 312, thereby making the assembly structure more compact and ensuring the vibration performance of the entire diaphragm assembly 31.

[0085] In this embodiment, a magnetic conductive portion 3121 is provided on the diaphragm assembly 31 of the vibration system 3, a front cover 4 is provided on the side of the diaphragm assembly 31 facing away from the magnetic circuit system 2, and an auxiliary magnet 41 is provided on the front cover 4, so that a first suction force exists between the magnetic conductive portion 3121 and the auxiliary magnet 41, and a second suction force exists between the magnetic conductive portion 3121 and the magnetic circuit system 2. When the sound unit 100 is in a non-working state, the vibration system 3 is located at a balanced position between the auxiliary magnet 41 and the magnetic circuit system 2 under the action of the combined force of the first suction force and the second suction force.

[0086] 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 311; 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 41 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.

[0087] It should be noted that auxiliary magnets 41 and magnetic circuit system 2 for attracting the magnetic conductive part 3121 are also provided on both sides of the magnetic conductive part 3121 in the vibration direction, that is, the auxiliary magnets 41 and magnetic circuit system 2 are respectively located on both sides of the magnetic conductive part 3121, so that when the magnetic conductive part 3121 vibrates with the vibration system 3, the magnetic conductive part 3121 can be close to the auxiliary magnets 41 or close to the magnetic circuit system 2. Optionally, the auxiliary magnets 41 and the magnetic circuit system 2 can be provided by magnets.

[0088] In this embodiment, the magnetization direction of the auxiliary magnet 41 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 41 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.

[0089] When the magnetic conductive part 3121 is close to the auxiliary magnet 41, it is away from the magnetic circuit system 2. Therefore, the attraction between the magnetic conductive part 3121 and the auxiliary magnet 41 becomes larger, and the attraction between the magnetic conductive part 3121 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 41. The total attraction received by the magnetic conductive part 3121 can be used as a force applied to the vibration system 3.

[0090] Based on the same principle, when the magnetic conductive part 3121 is close to the magnetic circuit system 2, it is away from the auxiliary magnet 41. Therefore, the attraction between the magnetic conductive part 3121 and the auxiliary magnet 41 becomes smaller, and the attraction between the magnetic conductive part 3121 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 received by the magnetic conductive part 3121 can be used as a force applied to the vibration system 3.

[0091] Optionally, when the vibration system 3 is at a balanced position, the attraction of the auxiliary magnet 41 on the magnetic conductive part 3121 is equal to the attraction of the magnetic circuit system 2 , so as to prevent the attraction on the magnetic conductive part 3121 from affecting the balanced position of the vibration system 3 .

[0092] 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 311 is downward. At this time, the first suction force between the magnetic conductive part 3121 and the auxiliary magnet 41 is upward, and the second suction force between the magnetic conductive part 3121 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 311 and is in an upward direction. Therefore, the combined force of the first suction force and the second suction force acts on the diaphragm 311 to offset a part of the strain recovery force of the diaphragm 311. Similarly, when the diaphragm assembly 31 is located below the initial position, the direction of the strain recovery force of the diaphragm 311 is upward. At this time, the first suction force between the magnetic conductive portion 3121 and the auxiliary magnet 41 is upward, and the second suction force between the magnetic conductive portion 3121 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 311 and is directed downward. Therefore, the combined force of the first suction force and the second suction force acts on the diaphragm 311 to offset part of the strain recovery force of the diaphragm 311.

[0093] In summary, 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 311 and is smaller than the strain recovery force of the diaphragm 311. 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 311.

[0094] 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 conductive part 3121 and the auxiliary magnet 41 and the second suction force between the magnetic conductive part 3121 and the magnetic circuit system 2 is not greater than the stiffness of the diaphragm 311. 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 conductive part 3121 and the auxiliary magnet 41 and the second suction force between the magnetic conductive part 3121 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.

[0095] It should be noted that the force exerted on the vibration system 3 by the first suction force between the magnetic conductive part 3121 and the auxiliary magnet 41 and the second suction force between the magnetic conductive part 3121 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 magnetic conductive part 3121 and the auxiliary magnet 41 and the second suction force between the magnetic conductive part 3121 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 magnetic conductive part 3121 and the auxiliary magnet 41 and the second suction force between the magnetic conductive part 3121 and the magnetic circuit system 2. The static magnetic force is manifested as follows: Fig. 9 shown.

[0096] 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.10 and Fig.11 shown.

[0097] The sound-emitting unit 100 of the present invention arranges the front cover 4 on the side of the diaphragm assembly 31 facing away from the magnetic circuit system 2, and arranges the diaphragm assembly 31 as a diaphragm 311 and a vibration plate 312 arranged on the diaphragm 311, and arranges a magnetic conductive portion 3121 on the vibration plate 312, and arranges an auxiliary magnet 41 on the front cover 4, so that the magnetizing direction of the auxiliary magnet 41 is opposite to the magnetizing direction of the central magnetic portion 22, so that there is a first suction force between the magnetic conductive portion 3121 and the auxiliary magnet 41, and there is a second suction force between the magnetic conductive portion 3121 and the magnetic circuit system 2, and the magnetic conductive portion 3121 interacts with the auxiliary magnet 41 of the front cover 4 and the magnetic circuit system 2 respectively, so as to introduce a static magnetic force into the vibration system 3, thereby effectively reducing the strain recovery force of the diaphragm assembly 31 during movement.

[0098] It can be understood that by providing the magnetic conductive part 3121 and the auxiliary magnet 41, a static magnetic force is introduced into the vibration system 3, so that 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 311 and is smaller than the strain recovery force of the diaphragm 311; 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 311, 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 unit 100.

[0099] In one embodiment, the magnetic conductive portion 3121 may be a magnetic conductive plate, and the material of the magnetic conductive plate is SPCC or SUS430. Of course, the vibration plate 312 may also be made of a magnetic conductive material, so that the vibration plate 312 is formed into the magnetic conductive portion 3121.

[0100] In one embodiment, the magnetic conductive portion 3121 is bonded to the vibration plate 312. For example, the magnetic conductive portion 3121 can be connected to the vibration plate 312 by means of glue. Alternatively, the magnetic conductive portion 3121 is welded to the vibration plate 312. For example, the magnetic conductive portion 3121 can be connected to the vibration plate 312 by means of soldering. Of course, in other embodiments, the magnetic conductive portion 3121 and the vibration plate 312 can also be integrally injection molded, that is, the magnetic conductive portion 3121 and the vibration plate 312 are processed into an integral structure by injection molding, which is not limited here.

[0101] In one embodiment, the magnetic conductive portion 3121 is disposed on the side of the vibration plate 312 facing the front cover 4; and / or, the magnetic conductive portion 3121 is disposed on the side of the vibration plate 312 facing the central magnetic portion 22; and / or, the vibration plate 312 is provided with a fixed cavity, and the magnetic conductive portion 3121 is disposed in the fixed cavity.

[0102] It can be understood that the magnetic conductive portion 3121 can be disposed on at least one side of the vibration plate 312, that is, the magnetic conductive portion 3121 can be disposed on one side or two opposite sides of the vibration plate 312. In this embodiment, the vibration plate 312 has a first surface and a second surface disposed opposite to each other, and the first surface faces the front cover 4. In this case, the magnetic conductive portion 3121 can be disposed on the first surface, such as Figures 5 to 8 As shown; the magnetic conductive portion 3121 may also be disposed on the second surface; the magnetic conductive portion 3121 may also be disposed on the first surface and the second surface at the same time.

[0103] Of course, the magnetic conductive part 3121 can also be disposed in the vibration plate 312, that is, the magnetic conductive part 3121 is embedded in the vibration plate 312 or injection molded in the vibration plate 312. In one embodiment, a fixed cavity is disposed in the vibration plate 312, and the magnetic conductive part 3121 is disposed in the fixed cavity.

[0104] In one embodiment, the magnetic conductive parts 3121 include multiple ones. It is understandable that the multiple magnetic conductive parts 3121 can be simultaneously disposed on the same side of the vibration plate 312; or, the multiple magnetic conductive parts 3121 can be simultaneously disposed on different sides of the vibration plate 312. For example, the multiple magnetic conductive parts 3121 can be simultaneously disposed on the first surface or the second surface of the vibration plate 312; or, the multiple magnetic conductive parts 3121 can be simultaneously disposed on the first surface and the second surface of the vibration plate 312, which is not limited here.

[0105] It can be understood that when multiple magnetic conductive parts 3121 are arranged on the same side of the vibration plate 312, the multiple magnetic conductive parts 3121 are arranged in a spliced ​​manner. For example, two adjacent magnetic conductive parts 3121 among the multiple magnetic conductive parts 3121 are arranged closely together, that is, there is no gap. When multiple magnetic conductive parts 3121 are arranged on the same side of the vibration plate 312, the multiple magnetic conductive parts 3121 are arranged at intervals. For example, there is a gap between two adjacent magnetic conductive parts 3121 among the multiple magnetic conductive parts 3121.

[0106] Optionally, the magnetic conductive portion 3121 is circular, elliptical or polygonal. That is, the shape of the magnetic conductive portion 3121 can be a polygonal structure such as a circular, elliptical, triangular, square, etc., which is not limited here. In order to ensure the balance of magnetic attraction between the auxiliary magnet 41 and the magnetic conductive portion 3121, the structure of the magnetic conductive portion 3121 can be a symmetrical structure or a regular structure, which is not limited here.

[0107] In this embodiment, the auxiliary magnet 41 and the magnetic conductive part 3121 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 41 and the magnetic conductive part 3121. In order to further ensure the balance of the vibration system 3 of the sound-emitting unit 100, the central axis of the magnetic conductive part 3121 can optionally coincide with the central axis of the sound-emitting unit 100.

[0108] In one embodiment, the diaphragm 311 is provided with an inner ring hole 3111, the vibration plate 312 is covered with the inner ring hole 3111, the vibration plate 312 is provided with a fixing groove 3122, and the magnetic conductive portion 3121 is disposed in the fixing groove 3122. It can be understood that, as Figures 3 to 5 , Figure 7 and Figure 8 As shown, the fixing groove 3122 may be a groove structure recessed in the vibration plate 312. Optionally, the fixing groove 3122 is formed by the side of the vibration plate 312 facing away from the central magnetic part 22 being recessed toward the direction close to the central magnetic part 22, that is, the side of the vibration plate 312 facing away from the central magnetic part 22 is recessed toward the direction close to the central magnetic part 22 to form the fixing groove 3122. Alternatively, the fixing groove 3122 may be formed by the side of the vibration plate 312 facing the central magnetic part 22 being recessed toward the front cover 4, which is not limited here.

[0109] 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 conductive portion 3121 .

[0110] In this embodiment, if Figures 3 to 8 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.

[0111] 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.

[0112] 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.

[0113] In this embodiment, by providing a recessed area 223 on the central magnetic conductive plate 222 of the central magnetic portion 22, the influence of the magnetic focusing effect of the central magnetic conductive plate 222 on the second suction force can be reduced, thereby effectively increasing the magnetic attraction between the magnetic conductive portion 3121 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 3122 of the vibration plate 312. Optionally, part of the central magnetic conductive 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 passes through the central magnetic conductive plate 222.

[0114] 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.

[0115] 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.

[0116] In this embodiment, if Figure 6 and Figure 8 As 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 conductive portion 3121. It can be understood that in order to prevent the protrusion 224 of the central magnet 221 from affecting the vibration of the fixed groove 3122 of the vibration plate 312 when the diaphragm 311 vibrates, optionally, the end surface of the protrusion 224 facing the diaphragm 311 does not exceed the end surface of the central magnetic conductive plate 222 facing the diaphragm 311, which effectively avoids the fixed groove 3122 of the vibration plate 312. Optionally, the recessed area 223 is provided corresponding to the fixed groove 3122, which is not limited here.

[0117] 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 8 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] In this embodiment, if Figures 3 to 8 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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 .

[0128] In this embodiment, if Figure 3 , Figure 4 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.

[0129] In one embodiment, if Figure 3 and Figure 4 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.

[0130] In one embodiment, the periphery of the front cover 4 is connected to the periphery of the diaphragm 311 to form a vibration space 42 between the front cover 4 and the diaphragm assembly 31 , and the front cover 4 is also provided with a sound hole 43 , which is connected to the vibration space 42 ; the sound unit 100 also includes a mesh 5 , which covers the sound hole 43 .

[0131] In this embodiment, if Figures 1 to 6 As shown, the auxiliary magnet 41 is disposed on the front cover 4. In order to facilitate the sound-generating unit 100 to make sound smoothly, in this embodiment, the front cover 4 is also provided with a sound hole 43, and the sound hole 43 is connected to the vibration space 42. Optionally, the sound hole 43 is arranged directly opposite to the diaphragm assembly 31. In order to prevent dust, water vapor and other debris from passing through the sound hole 43 to affect the sound of the diaphragm assembly 31, the sound-generating unit 100 further includes a mesh 5, and the mesh 5 covers the sound hole 43.

[0132] In this embodiment, the acoustic hole 43 may be one or more. Optionally, the acoustic hole 43 includes a plurality of acoustic holes 43, and the plurality of acoustic holes 43 are arranged around the auxiliary magnet 41. It can be understood that the mesh 5 may be one or more. When there is one mesh 5, the mesh 5 covers all the acoustic holes 43; when there are multiple meshes 5, one mesh 5 covers at least one acoustic hole 43.

[0133] In order to connect the periphery of the front cover 4 with the diaphragm assembly 31, the position where the auxiliary magnet 41 is arranged on the front cover 4 is spaced from the diaphragm assembly 31. It can be understood that the front cover 4 can be optionally in an inverted U-shape or a pot cover or a hat structure, which is not limited here.

[0134] It should be noted that the structure of the front cover 4 is not limited to the structural form of the front cover 4 and the module upper shell 44, and can also be other structural design forms, as long as it can support and fix the auxiliary magnet 41, and is not limited here.

[0135] It is understandable that the front cover 4 can be made of metal, plastic, or injection molded from metal and plastic, which is not limited here. Optionally, the auxiliary magnet 41 is bonded to the front cover 4. For example, the auxiliary magnet 41 can be fixed to the front cover 4 by bonding with an adhesive layer. Of course, in other embodiments, the auxiliary magnet 41 can also be welded to the front cover 4, for example, the auxiliary magnet 41 can be fixed to the front cover 4 by soldering, which is not limited here.

[0136] In order to facilitate the processing of the front cover 4 and improve the connection strength between the front cover 4 and the auxiliary magnet 41, the auxiliary magnet 41 is optionally integrally injection molded with the front cover 4. In this embodiment, the auxiliary magnet 41 is optionally made of a magnetic conductive material. Optionally, the auxiliary magnet 41 is a magnet.

[0137] In one embodiment, the auxiliary magnet 41 is disposed on the side of the front cover 4 facing the diaphragm assembly 31; and / or, the auxiliary magnet 41 is disposed on the side of the front cover 4 facing away from the diaphragm assembly 31; and / or, the front cover 4 is provided with an installation cavity, and the auxiliary magnet 41 is disposed in the installation cavity.

[0138] It can be understood that the auxiliary magnet 41 can be arranged on at least one side of the front cover 4, that is, the auxiliary magnet 41 can be arranged on one side or two opposite sides of the front cover 4. In this embodiment, the front cover 4 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 41 can be arranged on the upper surface; the auxiliary magnet 41 can also be arranged on the lower surface, such as Figure 5 , Figure 6 As shown; the auxiliary magnet 41 can also be arranged on the upper surface and the lower surface at the same time.

[0139] Of course, the auxiliary magnet 41 can also be disposed in the front cover 4, that is, the auxiliary magnet 41 is embedded in the front cover 4 or injection molded in the front cover 4. In one embodiment, a mounting cavity is disposed in the front cover 4, and the auxiliary magnet 41 is disposed in the mounting cavity.

[0140] In one embodiment, the auxiliary magnet 41 includes a plurality of auxiliary magnets. It is understandable that the plurality of auxiliary magnets 41 can be simultaneously disposed on the same side of the front cover 4; or, the plurality of auxiliary magnets 41 can be simultaneously disposed on different sides of the front cover 4. For example, the plurality of auxiliary magnets 41 can be simultaneously disposed on the upper surface or the lower surface of the front cover 4; or, the plurality of auxiliary magnets 41 can be simultaneously disposed on the upper surface and the lower surface of the front cover 4, which is not limited here.

[0141] It is understandable that when multiple auxiliary magnets 41 are arranged on the same side of the front cover 4, the multiple auxiliary magnets 41 are arranged in a spliced ​​manner. For example, two adjacent auxiliary magnets 41 among the multiple auxiliary magnets 41 are arranged closely together, that is, there is no gap. When multiple auxiliary magnets 41 are arranged on the same side of the front cover 4, the multiple auxiliary magnets 41 are arranged at intervals. For example, there is a gap between two adjacent auxiliary magnets 41 among the multiple auxiliary magnets 41.

[0142] Optionally, the auxiliary magnet 41 is circular, elliptical or polygonal. That is, the shape of the auxiliary magnet 41 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 41 and the magnetic conductive part 3121, the structure of the auxiliary magnet 41 can be a symmetrical structure or a regular structure, which is not limited here.

[0143] In this embodiment, the auxiliary magnet 41 and the magnetic conductive part 3121 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 41 and the magnetic conductive part 3121. In order to further ensure the balance of the vibration system 3 of the sound-generating unit 100, the central axis of the auxiliary magnet 41 can optionally coincide with the central axis of the sound-generating unit 100. Optionally, the auxiliary magnet 41 is a magnet.

[0144] In one embodiment, if Figure 6 As shown, a mounting groove 44 is provided on a side of the front cover 4 facing the diaphragm assembly 31 , and the auxiliary magnet 41 is disposed in the mounting groove 44 .

[0145] In this embodiment, the mounting groove 44 may be a groove structure formed by a concave surface of one side of the front cover 4, or may be a concave structure formed by a concave surface of one side of the front cover 4 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 44 can be set on the lower surface of the front cover 4. Of course, in other embodiments, the mounting groove 44 can be set on the upper surface of the front cover 4, which is not limited here.

[0146] The present invention also provides an electronic device, which includes the above-mentioned sound unit 100. The specific structure of the sound unit 100 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 repeated here one by one.

[0147] In one embodiment, the electronic device further includes a device housing and a flexible circuit board. The sound unit 100 is disposed in the device housing. 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 supply.

[0148] 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.

[0149] In this embodiment, the device housing has a cavity, the sound unit 100 is disposed in the cavity of the device housing, and at least one end of the flexible circuit board connected to the sound unit 100 is located in the cavity of the device housing. Of course, in other embodiments, the flexible circuit board can also be entirely disposed in the cavity of the device housing, which is not limited here.

[0150] It is understandable 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. In the electronic device, the sound unit 100 can be assembled into the housing of the electronic device in the form of a module, or it can be assembled into the housing of the electronic device in the form of a monomer. The electronic device can be a mobile phone, an MP3, an MP4, a tablet computer, a headset, a wearable device, etc., which are not listed here one by one.

[0151] 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-emitting unit, characterized in that: The sound-emitting unit comprises: A magnetic circuit system, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion and a side magnetic portion arranged on the magnetic yoke, wherein the central magnetic portion and the side magnetic portion are spaced apart to form a magnetic gap; a vibration system, the vibration system being arranged at 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 diaphragm and a vibration plate arranged on the diaphragm, the vibration plate having a magnetic conductive portion; and A front cover, the front cover is arranged on a side of the diaphragm assembly facing away from the magnetic circuit system, the front cover is provided with an auxiliary magnet, and a magnetization direction of the auxiliary magnet is opposite to a magnetization direction of the central magnetic part; There is a first attraction between the magnetic conductive part and the auxiliary magnet, and a second attraction between the magnetic conductive part 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 attraction and the second attraction.

2. The sound-emitting unit according to claim 1, characterized in that: The magnetic conductive part is bonded to the vibration plate; Or, the magnetic conductive part and the vibration plate are integrally injection molded; Alternatively, the vibration plate is made of a magnetic conductive material, and the vibration plate is formed as the magnetic conductive portion.

3. The sound-emitting unit according to claim 1, characterized in that: The magnetic conductive part is arranged on a side of the vibration plate facing the front cover; And / or, the magnetic conductive portion is arranged on a side of the vibration plate facing the central magnetic portion; And / or, the vibration plate is provided with a fixed cavity, and the magnetic conductive part is arranged in the fixed cavity.

4. The sound-emitting unit according to claim 1, characterized in that: The magnetic conductive parts include a plurality of parts; the plurality of magnetic conductive parts are arranged on the same side and / or different sides of the diaphragm assembly; and / or the plurality of magnetic conductive parts are arranged in a spliced ​​manner or in an interval manner; And / or, the magnetic conductive portion is circular, elliptical or polygonal; And / or, the central axis of the magnetic conductive portion coincides with the central axis of the sound-emitting unit; And / or, the magnetic conductive part is a magnetic conductive plate, and the material of the magnetic conductive plate is SPCC or SUS430.

5. The sound-emitting unit 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 conductive part.

6. The sound-emitting unit according to claim 5, 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.

7. The sound-emitting unit according to claim 5, 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.

8. The sound-emitting unit according to claim 7, characterized in that: An end surface of the protrusion facing the diaphragm does not exceed an end surface of the central magnetic conductive plate facing the diaphragm.

9. The sound-emitting unit according to claim 5, characterized in that: The diaphragm is provided with an inner ring hole, the vibration plate cover is arranged on the inner ring hole, the side of the vibration plate facing away from the central magnetic part is recessed towards the direction close to the central magnetic part to form a fixing groove, and the magnetic conductive part is arranged in the fixing groove.

10. The sound-emitting unit according to claim 1, characterized in that: The periphery of the front cover is connected to the periphery of the diaphragm so that a vibration space is formed between the front cover and the diaphragm assembly, and the front cover is also provided with a sound hole, and the sound hole is connected to the vibration space; The sound-emitting unit further includes a mesh cloth, and the mesh cloth covers the sound hole.

11. The sound-emitting unit according to claim 10, characterized in that: The sound holes include a plurality of sound holes, and the plurality of sound holes are arranged around the auxiliary magnet.

12. The sound-emitting unit according to claim 1, characterized in that: The auxiliary magnet is bonded to the front cover; Alternatively, the auxiliary magnet and the front cover are integrally injection molded.

13. The sound-emitting unit according to claim 1, characterized in that: The auxiliary magnet is arranged on a side of the front cover facing the diaphragm assembly; And / or, the auxiliary magnet is arranged on a side of the front cover facing away from the diaphragm assembly; And / or, the front cover is provided with a mounting cavity, and the auxiliary magnet is arranged in the mounting cavity.

14. The sound-emitting unit 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 front cover; 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 and the magnetic conductive part are arranged opposite to each other; And / or, a mounting groove is provided on a side of the front cover facing the diaphragm assembly, and the auxiliary magnet is arranged in the mounting groove.

15. The sound-emitting unit according to any one of claims 1 to 14, characterized in that: The sound-emitting unit further comprises a shell, wherein the shell is arranged at the periphery of the magnetic circuit system, and the periphery of the diaphragm is sandwiched between the shell and the front cover.

16. An electronic device, characterized in that: The electronic device comprises the sound-emitting unit according to any one of claims 1 to 15.

Images