Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electro-acoustic transformation.The sound production device comprises a shell, a magnetic circuit system and a vibration system, a common magnetic part of the magnetic circuit system is located on the outer side of a center magnetic part and is spaced from the center magnetic part to form a first magnetic gap, and side magnetic parts are located on the outer side of the common magnetic part and are spaced from the center magnetic part to form a second magnetic gap; the central magnetic part comprises a first central magnet, a central magnetic conductive plate and a second central magnet which are arranged in a stacked mode, the shared magnetic part comprises a first shared magnet, a shared magnetic conductive plate and a second shared magnet which are arranged in a stacked mode, and an inner ring hole is formed in the center of a vibrating diaphragm of the vibrating system. The inner periphery of the vibrating diaphragm is connected with the magnetic circuit system, the first voice coil corresponds to the first magnetic gap, and the second voice coil corresponds to the second magnetic gap. According to the sound production device, the utilization rate of the magnetic circuit system is effectively improved, and the BL value is improved, so that the loudness and sensitivity of the sound production device are improved.

Description

Technical Field

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

[0002] With the development of the portable consumer electronic product market, miniature sound-generating devices have been widely used, and with the multifunctional and miniaturized design of portable terminal electronic products, higher requirements are placed on the vibration and acoustic performance of miniature sound generators. Sound-generating devices generally include a magnetic circuit system and a vibration system, wherein the vibration system includes a diaphragm and a voice coil combined with one side of the diaphragm. The energized voice coil can drive the diaphragm to vibrate under the action of the magnetic circuit system, thereby realizing the sound of the sound-generating device.

[0003] In the related technology, small rear cavity sound-emitting devices usually adopt a single voice coil solution. The voice coil has a low utilization rate of the magnetic field generated by the magnetic circuit system, and the vibration effect of the diaphragm driven by the voice coil is not ideal, which reduces the BL value of the sound-emitting device. In addition, the utilization rate of the magnetic energy in the middle area of ​​the central magnet in the magnetic circuit system is low and cannot be effectively utilized, thus affecting the loudness and sensitivity of the micro speaker. Summary of the invention

[0004] The main purpose of the present invention is to provide a sound-generating device and an electronic device, aiming to provide a sound-generating device with a high magnetic field utilization rate. The sound-generating device optimizes the magnetic circuit system and adopts inner and outer double voice coils to further improve the utilization rate of the magnetic circuit system and improve the BL value, thereby improving the loudness and sensitivity of the sound-generating device.

[0005] To achieve the above object, the present invention provides a sound-generating device, comprising:

[0006] shell;

[0007] a magnetic circuit system connected to one end of the housing, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion, a common magnetic portion and a side magnetic portion arranged on the magnetic yoke, the common magnetic portion being located outside the central magnetic portion and spaced apart from the central magnetic portion to form a first magnetic gap, the side magnetic portion being located outside the common magnetic portion and spaced apart from the common magnetic portion to form a second magnetic gap, the central magnetic portion comprising a first central magnet, a central magnetic plate and a second central magnet arranged in a stacked manner, and the common magnetic portion comprising a first common magnet, a common magnetic plate and a second common magnet arranged in a stacked manner; and

[0008] A vibration system, the vibration system comprising a diaphragm and a first voice coil and a second voice coil connected to the diaphragm, the diaphragm having an inner ring hole at the center, the outer periphery of the diaphragm being connected to the housing, the inner periphery of the diaphragm being connected to the magnetic circuit system, the first voice coil being arranged corresponding to the first magnetic gap, and the second voice coil being arranged corresponding to the second magnetic gap;

[0009] Among them, the first central magnet, the central magnetic conductive plate and the second central magnet respectively correspond to the first common magnet, the common magnetic conductive plate and the second common magnet in a vibration direction perpendicular to the vibration system, and the thickness of the second central magnet along the vibration direction of the vibration system is greater than the thickness of the second common magnet along the vibration direction of the vibration system, and the top surface height of the diaphragm is lower than the top surface height of the magnetic circuit system.

[0010] In one embodiment, the magnetically conductive yoke includes a first magnetic yoke and a second magnetic yoke, the central magnetic portion, the common magnetic portion and the edge magnetic portion are all provided on the first magnetic yoke, the second magnetic yoke is connected to the central magnetic portion and an end of the common magnetic portion away from the first magnetic yoke, the first central magnet and the first common magnet are connected to the first magnetic yoke, and the second central magnet and the second common magnet are connected to the second magnetic yoke;

[0011] The second magnetic yoke includes a protruding portion and a border portion connected to the edge of the protruding portion, the protruding portion passes through the inner ring hole and forms a recessed groove facing the central magnetic portion, the second central magnet has a protruding portion protruding from the second common magnet, the protruding portion is accommodated and confined in the recessed groove, and the inner periphery of the diaphragm is connected to the border portion.

[0012] In one embodiment, the diaphragm includes an inner ring portion, a first folded ring arranged around the inner ring portion, a straight portion arranged around the first folded ring, a second folded ring arranged around the straight portion, and a fixed portion connected to the outer side of the second folded ring, the fixed portion is connected to the outer shell, the inner ring portion is formed with the inner ring hole, and the inner ring portion is connected to the edge portion.

[0013] In one embodiment, the inner ring portion, the first fold ring, the straight portion, the second fold ring and the fixing portion are an integrally formed structure;

[0014] And / or, the top surface height of the edge magnetic portion is lower than the top surface height of the common magnetic portion, the protrusion direction of the first fold ring is toward the direction away from the magnetic circuit system, the protrusion direction of the second fold ring is opposite to the protrusion direction of the first fold ring, the first fold ring is at least partially opposite to the second magnetic gap, and the second fold ring is at least partially opposite to the edge magnetic circuit portion;

[0015] And / or, a avoidance structure is provided at a periphery of the second common magnet adjacent to the second magnetic gap.

[0016] In one embodiment, the common magnetic portion is provided with an escape gap connecting the first magnetic gap and the second magnetic gap;

[0017] The vibration system also includes a skeleton, which includes a main body and a connecting part connected to the main body, the main body is connected to the diaphragm, the connecting part is located in the avoidance gap, and two ends of the connecting part are respectively connected to the first voice coil and the second voice coil.

[0018] In one embodiment, an escape space is formed between the edge magnetic portion and the housing;

[0019] The vibration system further comprises a centering support plate, one end of which is connected to the housing, and the other end of which is located in the avoidance space;

[0020] The frame includes an extension portion, one end of which is connected to the periphery of the main body portion, and the other end of which extends toward the centering support piece and is connected to the centering support piece.

[0021] In one embodiment, the main body is arranged in a rectangular ring, the connecting part includes a plurality of connecting parts, the plurality of connecting parts are arranged corresponding to the four corners of the main body respectively, and the common magnetic part is provided with an avoidance notch corresponding to each connecting part;

[0022] And / or, two ends of the connecting portion are respectively provided with a first connecting surface and a second connecting surface, the first connecting surface is connected to the first voice coil, and the second connecting surface is connected to the second voice coil;

[0023] And / or, the shell has a long side and a short side connected end to end, the centering support plates include two, the two centering support plates are symmetrically arranged and respectively correspond to the two long sides or the two short sides.

[0024] In one embodiment, the first central magnet and the second central magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles of the first central magnet and the second central magnet close to the central magnetic conductive plate are the same;

[0025] The first common magnet and the second common magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles of the first common magnet and the second common magnet close to the common magnetic conductive plate are the same;

[0026] The magnetic poles of the first central magnet and the second central magnet close to the central magnetic conductive plate are opposite to the magnetic poles of the first common magnet and the second common magnet close to the common magnetic conductive plate.

[0027] In one embodiment, the edge magnetic part includes a stacked edge magnet and an edge magnetic conductive plate, the edge magnet is connected to the magnetic conductive yoke, and the edge magnetic conductive plate is connected to the housing;

[0028] Among them, the side magnets are magnetized along the vibration direction of the vibration system, the magnetic poles of the side magnets close to the side magnetic conductive plates are the same as the magnetic poles of the first center magnets close to the center magnetic conductive plates, and the magnetic poles of the side magnets close to the side magnetic conductive plates are opposite to the magnetic poles of the first common magnets close to the common magnetic conductive plates.

[0029] In one embodiment, the sound-emitting device is installed in the shell of the sound-emitting module, and forms a front cavity and a rear cavity between the shell and the sound-emitting device. The shell is provided with a sound outlet hole connected to the front cavity, and the sound waves of the diaphragm are radiated to the outside through the sound outlet hole, wherein the volume of the rear cavity is ≤1.5cc.

[0030] The present invention further provides an electronic device, which includes the sound-generating device described above.

[0031] The sound-generating device of the technical solution of the present invention connects the magnetic circuit system to one end of the shell and the periphery of the diaphragm of the vibration system to the shell, thereby realizing the integration and fixing of the magnetic circuit system and the vibration system on the shell; at the same time, by setting the magnetic circuit system as a magnetic yoke and a central magnetic part, a common magnetic part and a side magnetic part arranged on the magnetic yoke, so that the common magnetic part is located on the outside of the central magnetic part and is spaced from the central magnetic part to form a first magnetic gap, and the side magnetic part is located on the outside of the common magnetic part and is spaced from the common magnetic part to form a second magnetic gap, so that the first voice coil of the vibration system is set corresponding to the first magnetic gap, and the second voice coil is set corresponding to the second magnetic gap, so as to form an inner and outer double voice coil structure, so that current is passed through the first voice coil and the second voice coil, so that the two voice coils are respectively in the first magnetic gap and the second magnetic gap formed by the magnetic circuit system. The diaphragm vibrates in the magnetic field of the gap and drives the diaphragm to vibrate and make sound, so as to improve the BL value; further, by setting the central magnetic part as the first central magnet, the central magnetic plate and the second central magnet which are stacked, and setting the common magnetic part as the first common magnet, the common magnetic plate and the second common magnet which are stacked, the first central magnet, the central magnetic plate and the second central magnet respectively correspond to the first common magnet, the common magnetic plate and the second common magnet in a vibration direction perpendicular to the vibration system, so that the common magnetic part is shared by the central magnetic part and the side magnetic part, and two magnetic gaps arranged inside and outside are formed, so that the first voice coil and the second voice coil can make full use of the magnetic fields of the central magnetic part and the common magnetic part, improve the magnetic energy utilization rate of the magnetic circuit system, thereby improving the loudness and sensitivity of the sound-emitting device, so as to improve the product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 An exploded schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0034] Figure 2 A cross-sectional schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0035] Figure 3 A partial structural schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0036] Figure 4 A schematic structural diagram of an embodiment of a diaphragm provided by the present invention;

[0037] Figure 5 A schematic structural diagram of an embodiment of a skeleton provided by the present invention;

[0038] Figure 6 A cross-sectional schematic diagram of an embodiment of a sound module provided by the present invention.

[0039] Description of Figure Numbers:

[0040] 100. Sounding device; 1. Shell; 11. Long side; 12. Short side; 13. Avoidance space; 2. Magnetic circuit system; 21. Magnetic yoke; 211. First magnetic yoke; 212. Second magnetic yoke; 2121. Protrusion; 2122. Edge; 2123. Concave groove; 22. Center magnetic part; 221. First center magnet; 222. Center magnetic plate; 223. Second center magnet; 224. Protrusion; 23. Common magnetic part; 231. First common magnet; 232. Common magnetic plate; 233. Second common magnet; 234. Avoidance structure; 235. Avoidance gap; 24. Edge magnetic part; 241 , side magnet; 242, side magnetic plate; 25, first magnetic gap; 26, second magnetic gap; 3, vibration system; 31, diaphragm; 311, inner ring; 312, inner ring hole; 313, first fold ring; 314, straight portion; 315, second fold ring; 316, fixing portion; 32, first voice coil; 33, second voice coil; 34, skeleton; 341, main body; 342, connecting portion; 3421, first connecting surface; 3422, second connecting surface; 343, extension portion; 35, centering support plate; 400, shell; 410, sound outlet hole; 420, front cavity; 430, rear cavity; 500, sound module.

[0041] 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

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] With the development of the portable consumer electronic product market, miniature sound-generating devices have been widely used, and with the multifunctional and miniaturized design of portable terminal electronic products, higher requirements are placed on the vibration and acoustic performance of miniature sound generators. Sound-generating devices generally include a magnetic circuit system and a vibration system, wherein the vibration system includes a diaphragm and a voice coil combined with one side of the diaphragm. The energized voice coil can drive the diaphragm to vibrate under the action of the magnetic circuit system, thereby realizing the sound of the sound-generating device.

[0047] In the related art, small rear cavity sound-generating devices (usually the rear cavity is less than 1.5cc) usually adopt a single voice coil solution. The voice coil has a low utilization rate of the magnetic field generated by the magnetic circuit system, and the vibration effect of the voice coil driving the diaphragm is not ideal, which reduces the BL value of the sound-generating device. In addition, the utilization rate of the magnetic energy in the middle area of ​​the center magnet in the magnetic circuit system is low and cannot be effectively utilized, thus affecting the loudness and sensitivity of the micro speaker. The loudness of micro sound-generating devices generally cannot meet the demand, so it is an important task to further improve the utilization rate of the magnet and enhance the sensitivity of the sound-generating device.

[0048] Based on the above ideas and problems, the present invention proposes a sound-generating device 100. It can be understood that the sound-generating device 100 is applied to electronic devices, and the electronic devices can be mobile phones, computers, headphones, watches, etc., which are not limited here.

[0049] Please refer to Figures 1 to 5 As shown, in the embodiment of the present invention, the sound-generating device 100 includes a housing 1, a magnetic circuit system 2 and a vibration system 3. The magnetic circuit system 2 is connected to one end of the housing 1. The magnetic circuit system 2 includes a magnetic yoke 21 and a central magnetic portion 22, a common magnetic portion 23 and a side magnetic portion 24 arranged on the magnetic yoke 21. The common magnetic portion 23 is located on the outside of the central magnetic portion 22 and is spaced from the central magnetic portion 22 to form a first magnetic gap 25. The side magnetic portion 24 is located on the outside of the common magnetic portion 23 and is spaced from the common magnetic portion 23 to form a second magnetic gap 26. The central magnetic portion 22 includes a first central magnet 221, a central magnetic plate 222 and a second central magnet 223 arranged in a stacked manner. The common magnetic portion 23 includes a first central magnet 221, a central magnetic plate 222 and a second central magnet 223 arranged in a stacked manner. A common magnet 231, a common magnetic plate 232 and a second common magnet 233, the vibration system 3 includes a diaphragm 31 and a first voice coil 32 and a second voice coil 33 connected to the diaphragm 31, an inner ring hole 312 is provided in the center of the diaphragm 31, the outer periphery of the diaphragm 31 is connected to the outer shell 1, the inner periphery of the diaphragm 31 is connected to the magnetic circuit system 2, the first voice coil 32 is arranged corresponding to the first magnetic gap 25, and the second voice coil 33 is arranged corresponding to the second magnetic gap 26; wherein, the first center magnet 221, the center magnetic plate 222 and the second center magnet 223 respectively correspond to the first common magnet 231, the common magnetic plate 232 and the second common magnet 233 in a one-to-one manner perpendicular to the vibration direction of the vibration system 3.

[0050] In this embodiment, the housing 1 is used to install, fix, support and protect components such as the vibration system 3 and the magnetic circuit system 2, that is, the housing 1 provides an installation base for the vibration system 3, the magnetic circuit system 2 and other components. It can be understood that the housing 1 can be a structure such as a mounting shell, a shell or a box body with a mounting cavity, that is, the housing 1 defines a receiving space, which is not limited here. Optionally, the housing 1 is a rectangular structure, and the housing 1 has two opposite long sides and two short sides, the two ends of the short side are respectively connected to the two long sides, and the two ends of the long side are respectively connected to the two short sides, so that the housing 1 defines a receiving space.

[0051] It is understandable that when the housing 1 is a metal part, the magnetic circuit system 2 is fixed to the housing 1 by bonding or welding. In another embodiment, when the housing 1 is plastic injection molded, the side magnetic conductive plate 242 of the magnetic circuit system 2 is first injection molded into the housing 1 as an insert, or the magnetic circuit system 2 is fixed to the housing 1 by bonding, and then other parts are bonded and fixed, which is not limited here.

[0052] In this embodiment, the magnetic circuit system 2 is arranged in the receiving space and connected to the housing 1. By setting the magnetic circuit system 2 as a magnetic yoke 21 and a central magnetic portion 22, a common magnetic portion 23 and a side magnetic portion 24 arranged on the magnetic yoke, the common magnetic portion 23 is located outside the central magnetic portion 22 and is spaced from the central magnetic portion 22 to form a first magnetic gap 25, and the side magnetic portion 24 is located outside the common magnetic portion 23 and is spaced from the common magnetic portion 23 to form a second magnetic gap 26, that is, the second magnetic gap 26 is arranged around the first magnetic gap 25, and the vibration system 3 is set as a diaphragm 31 and a first voice coil 32 and a second voice coil 33 connected to the diaphragm 31, so that the first voice coil 32 of the vibration system 3 is arranged corresponding to the first magnetic gap 25, and the second voice coil 33 is arranged corresponding to the second magnetic gap 26, forming an inner and outer double voice coil structure.

[0053] In this embodiment, the first voice coil 32 and the second voice coil 33 are annular racetrack voice coils, one end of the first voice coil 32 and the second voice coil 33 are connected to the diaphragm 31, and the other ends of the first voice coil 32 and the second voice coil 33 are suspended in the first magnetic gap 25 and the second magnetic gap 26 respectively, which is not limited here.

[0054] It should be noted that by passing current through the first voice coil 32 and the second voice coil 33, the first voice coil 32 and the second voice coil 33 transfer electrical energy to the first magnetic gap 25 and the second magnetic gap 26 of the magnetic circuit system 2, so that the magnetic field generated by the magnetic circuit system 2 converts the electrical energy into mechanical energy, thereby causing the first voice coil 32 and the second voice coil 33 to vibrate, and at the same time drive the diaphragm 31 to vibrate and produce sound, further converting the mechanical energy into sound energy.

[0055] It can be understood that after the first voice coil 32 disposed in the first magnetic gap 25 receives the external alternating current signal, it moves back and forth to cut the magnetic field lines driven by the magnetic field force of the magnetic circuit system 2, driving the diaphragm 31 of the vibration system 3 to vibrate and produce sound. At the same time, after the second voice coil 33 receives the transmitted alternating current signal, it makes full use of the magnetic circuit system 2 to move back and forth to cut the magnetic field lines driven by the magnetic field force at the second magnetic gap 26, thereby making full use of the magnetic field of the magnetic circuit system 2, so that the first voice coil 32 and the second voice coil 33 cooperate to increase the driving force on the diaphragm 31, thereby effectively improving the BL value of the sound-generating device 100 and improving the vibration effect of the diaphragm 31.

[0056] In this embodiment, the first voice coil 32 and the second voice coil 33 can be connected in series or in parallel through a conductive structure, which is not limited here. In order to achieve electrical connection between the first voice coil 32 and the second voice coil 33 and the external circuit. In one embodiment, the vibration system 3 also includes a centering support plate or a connector or a skeleton 34, one end of the centering support plate or the connector or the skeleton 34 is connected to the first voice coil 32 and the second voice coil 33, and is connected and conducted with the leads of the first voice coil 32 and the second voice coil 33, and the other end of the centering support plate or the connector or the skeleton 34 is connected to the housing 1.

[0057] It can be understood that, taking the centering support as an example, the two ends of the centering support are electrically connected to the leads and external circuits of the first voice coil 32 and the second voice coil 33 respectively. In this embodiment, the centering support can be arranged at the bottom of the first voice coil 32 and the second voice coil 33, and the centering support is located at the four corners of the sound-generating device 100 or in the direction of the short axis or long axis of the sound-generating device 100. Of course, the centering support can also be arranged at the top of the first voice coil 32 and the second voice coil 33, and the centering support is located between the first voice coil 32 and the second voice coil 33 and the diaphragm 31, which is not limited here.

[0058] In one embodiment, the direction of the current in the second voice coil 33 is opposite to the direction of the current in the first voice coil 32. It can be understood that the current in the second voice coil 33 and the current in the first voice coil 32 are counterclockwise and clockwise respectively, and such an arrangement can ensure that the vibration direction generated by the first voice coil 32 in the first magnetic gap 25 is the same as the vibration direction generated by the second voice coil 33 in the second magnetic gap 26, thereby ensuring that the diaphragm 31 is vibrated in the same direction at the same time, so as to improve the vibration effect on the diaphragm 31.

[0059] In this embodiment, the magnetic yoke 21 of the magnetic circuit system 2 is opposite to the diaphragm 31, the central magnetic portion 22, the common magnetic portion 23 and the side magnetic portion 24 are all arranged on the side of the magnetic yoke 21 facing the diaphragm 31, and the magnetic circuit system 2 can be connected to the outer shell 1 through the side magnetic portion 24 and / or the magnetic yoke 21.

[0060] Optionally, the magnetic yoke 21 may be a magnetic plate or a magnetic basin frame, etc., which is not limited here. The magnetic yoke 21 is used to support and install the central magnetic part 22, the common magnetic part 23 and the side magnetic part 24. In this embodiment, the magnetic yoke 21 is bonded to the central magnetic part 22, the common magnetic part 23 and the side magnetic part 24, and the side magnetic part 24 is bonded to the housing 1.

[0061] In the present embodiment, the common magnetic part 23 is arranged around the central magnetic part 22. Optionally, the common magnetic part 23 may be a closed integral annular structure, the annular common magnetic part 23 surrounds the central magnetic part 22, and is spaced from the central magnetic part 22 to form an annular first magnetic gap 25. Optionally, the common magnetic part 23 may be in the shape of a circular ring or a rectangular ring, etc. Of course, the common magnetic part 23 includes a plurality of common magnetic parts 23, a plurality of common magnetic parts 23 are arranged around the central magnetic part 22, and adjacent common magnetic parts 23 are connected end to end to form a closed annular structure; or, the common magnetic part 23 includes a plurality of common magnetic parts 23, a plurality of common magnetic parts 23 are spaced and arranged around the central magnetic part 22, and there is a gap between adjacent common magnetic parts 23, and the gap may be an avoidance gap 235, which is used to provide an avoidance space for the skeleton 34, which is not limited here.

[0062] In one embodiment, the edge magnet portion 24 forms a closed integral annular structure. The annular edge magnet portion 24 surrounds the common magnetic portion 23 and is spaced from the common magnetic portion 23 to form an annular second magnetic gap 26. Optionally, the edge magnet portion 24 can be in the form of a circular ring or a rectangular ring, etc. Of course, the edge magnet portion 24 includes a plurality of adjacent edge magnet portions 24 connected end to end to form a closed annular structure; or, the edge magnet portion 24 includes a plurality of edge magnet portions 24 spaced and arranged around the common magnetic portion 23, and there is a gap between adjacent edge magnet portions 24, which is not limited here.

[0063] In this embodiment, by setting the central magnetic part 22 as a first central magnet 221, a central magnetic plate 222 and a second central magnet 223 which are stacked, and setting the common magnetic part 23 as a first common magnet 231, a common magnetic plate 232 and a second common magnet 233 which are stacked, the first central magnet 221, the central magnetic plate 222 and the second central magnet 223 of the central magnetic part 22 respectively correspond to the first common magnet 231, the common magnetic plate 232 and the second common magnet 233 of the common magnetic part 23 in a vibration direction perpendicular to the vibration system 3. In this way, the common magnetic part 23 is shared by the central magnetic part 22 and the side magnetic part 24, and a first magnetic gap 25 and a second magnetic gap 26 are formed, so that the first voice coil 32 and the second voice coil 33 can make full use of the magnetic field of the magnetic circuit system 2, improve the magnetic energy utilization rate of the magnetic circuit system 2, thereby improving the loudness and sensitivity of the sound-generating device 100, so as to improve the product performance.

[0064] In one embodiment, if Figure 1 , Figure 2and Figure 4 As shown, an inner ring hole 312 is provided in the center of the diaphragm 31 , the outer periphery of the diaphragm 31 is connected to the housing 1 , the inner periphery of the diaphragm 31 is connected to the magnetic circuit system 2 , and the top surface height of the diaphragm 31 is lower than the top surface height of the magnetic circuit system 2 .

[0065] It can be understood that by setting the diaphragm 31 as a ring structure, the inner periphery of the diaphragm 31 is connected to the magnetic circuit system 2, so that part of the magnetic circuit system 2 corresponds to the inner ring hole 312, and the top surface height of the diaphragm 31 is lower than the top surface height of the magnetic circuit system 2. When the sound-emitting device 100 is applied to a module or electronic device, the magnetic circuit system 2 of the sound-emitting device 100 can be used to abut the inner wall of the shell of the electronic device, so that a front cavity is formed between the diaphragm 31 and the shell, that is, there is no need to increase the front cavity space additionally, and the front sound cavity structure can be formed by utilizing the height difference between the magnetic circuit system 2 and the diaphragm 31 in the vibration system 3, thereby effectively reducing the Z-direction height of the electronic device.

[0066] The sound-generating device 100 of the present invention connects the magnetic circuit system 2 to one end of the housing 1 and connects the periphery of the diaphragm 31 of the vibration system 3 to the housing 1, thereby realizing that the magnetic circuit system 2 and the vibration system 3 are integrated and fixed on the housing 1; at the same time, by setting the magnetic circuit system 2 as a magnetic yoke 21 and a central magnetic portion 22, a common magnetic portion 23 and a side magnetic portion 24 provided on the magnetic yoke, the common magnetic portion 23 is located on the outside of the central magnetic portion 22 and is spaced from the central magnetic portion 22 to form a first magnetic gap 25, and the side magnetic portion 24 is located on the outside of the common magnetic portion 23 and is spaced from the common magnetic portion 23 to form a second magnetic gap 26, thereby the first voice coil 32 of the vibration system 3 is correspondingly arranged with the first magnetic gap 25, and the second voice coil 33 is correspondingly arranged with the second magnetic gap 26, forming an inner and outer double voice coil structure, so that current is passed through the first voice coil 32 and the second voice coil 33, so that the two voice coils are respectively in the magnetic fields of the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2. The inner vibration drives the diaphragm 31 to vibrate and produce sound, so as to improve the BL value; further, by setting the central magnetic part 22 as a first central magnet 221, a central magnetic plate 222 and a second central magnet 223 which are stacked, and setting the common magnetic part 23 as a first common magnet 231, a common magnetic plate 232 and a second common magnet 233 which are stacked, the first central magnet 221, the central magnetic plate 222 and the second central magnet 223 respectively correspond to the first common magnet 231, the common magnetic plate 232 and the second common magnet 233 in a vibration direction perpendicular to the vibration system 3, so that the common magnetic part 23 is shared by the central magnetic part 22 and the side magnetic part 24, and two magnetic gaps arranged inside and outside are formed, so that the first voice coil 32 and the second voice coil 33 can make full use of the magnetic fields of the central magnetic part 22 and the common magnetic part 23, improve the magnetic energy utilization rate of the magnetic circuit system 2, thereby improving the loudness and sensitivity of the sound-generating device 100, so as to improve the product performance.

[0067] In one embodiment, the magnetic yoke 21 includes a first magnetic yoke 211 and a second magnetic yoke 212, the central magnetic portion 22, the common magnetic portion 23 and the side magnetic portion 24 are all arranged on the first magnetic yoke 211, the second magnetic yoke 212 is connected to the central magnetic portion 22 and the common magnetic portion 23 at one end away from the first magnetic yoke 211, the first central magnet 221 and the first common magnet 231 are connected to the first magnetic yoke 211, and the second central magnet 223 and the second common magnet 233 are connected to the second magnetic yoke 212; the inner periphery of the diaphragm 31 is connected to the second magnetic yoke 212 so that part of the second magnetic yoke 212 corresponds to the inner ring hole 312.

[0068] In this embodiment, if Figure 1 and Figure 2 As shown, by setting the magnetic yoke 21 as the first magnetic yoke 211 and the second magnetic yoke 212 which are arranged opposite to each other, an installation space is formed between the first magnetic yoke 211 and the second magnetic yoke 212. At this time, the central magnetic part 22 and the common magnetic part 23 are arranged between the first magnetic yoke 211 and the second magnetic yoke 212, that is, the first central magnet 221 of the central magnetic part 22 and the first common magnet 231 of the common magnetic part 23 are connected to the first magnetic yoke 211, and the second central magnet 223 of the central magnetic part 22 and the second common magnet 233 of the common magnetic part 23 are connected to the second magnetic yoke 212. By setting the diaphragm 31 as a ring structure, the inner circle of the diaphragm 31 is connected to the second magnetic yoke 212, so that part of the second magnetic yoke 212 corresponds to the inner ring hole 312, and the side magnetic portion 24 is located between the magnetic yoke 21 and the diaphragm 31, so that the magnetic flux lines generated by the central magnetic portion 22 and the magnetic flux lines generated by the common magnetic portion 23 can effectively form a magnetic circuit passing through the first magnetic gap 25, and the magnetic flux lines generated by the common magnetic portion 23 and the magnetic flux lines generated by the side magnetic portion 24 can form a magnetic circuit passing through the second magnetic gap 26, effectively increasing the density of the magnetic flux of the first magnetic gap 25 and the second magnetic gap 26, so that the first voice coil 32 and the second voice coil 33 are in a more reasonable magnetic field, so as to alleviate the distortion of the audio output by the sound-generating device 100 and improve the sound quality of the audio output by the sound-generating device 100.

[0069] It can be understood that by connecting the inner periphery of the diaphragm 31 to the second yoke 212, the diaphragm 31 and the second yoke 212 are sealed and connected, thereby improving the sealing performance. At the same time, part of the second yoke 212 corresponds to the inner ring hole 312. When the sound-generating device 100 is applied to a module or electronic device, the second yoke 212 of the magnetic circuit system 2 of the sound-generating device 100 can be used to abut against the inner wall of the shell of the electronic device, so that a front cavity is formed between the diaphragm 31 and the shell, that is, there is no need to increase the front cavity space. The height difference between the second yoke 212 of the magnetic circuit system 2 and the diaphragm 31 in the vibration system 3 can be used to form a front sound cavity structure, thereby effectively reducing the Z-direction height of the electronic device.

[0070] Optionally, the central magnetic portion 22, the common magnetic portion 23 and the edge magnetic portion 24 are all magnetized in the vertical direction, the magnetization direction of the common magnetic portion 23 is opposite to that of the central magnetic portion 22 and the edge magnetic portion 24, and the magnetization direction of the central magnetic portion 22 and the edge magnetic portion 24 is the same. Such an arrangement can optimize the nonlinear performance of the BL.

[0071] In one embodiment, the diaphragm 31 includes an inner ring portion 311, a first fold ring 313 arranged around the inner ring portion 311, a straight portion 314 arranged around the first fold ring 313, a second fold ring 315 arranged around the straight portion 314, and a fixing portion 316 connected to the outer side of the second fold ring 315, the fixing portion 316 is connected to the outer shell 1, the inner ring portion 311 is formed with an inner ring hole 312, and the inner ring portion 311 is connected to the periphery of the second magnetic yoke 212.

[0072] In this embodiment, if Figure 1 , Figure 2 and Figure 4 As shown, the inner ring portion 311 , the first fold ring 313 , the straight portion 314 , the second fold ring 315 and the fixing portion 316 of the diaphragm 31 may be an integrally formed structure, thereby ensuring the vibration performance and structural strength of the diaphragm 31 .

[0073] In this embodiment, the top surface height of the side magnetic portion 24 is lower than the top surface height of the common magnetic portion 23, the protruding direction of the first fold ring 313 of the diaphragm 31 is toward the direction away from the magnetic circuit system 2, the protruding direction of the second fold ring 315 is opposite to the protruding direction of the first fold ring 313, the first fold ring 313 is at least partially opposite to the second magnetic gap 26, and the second fold ring 315 is at least partially opposite to the side magnetic circuit 24. The protruding direction of the first fold ring 313 is toward the direction away from the magnetic circuit system 2, and the first fold ring 313 is at least partially opposite to the second magnetic gap 26, thereby avoiding interference between the first fold ring 313 and the second yoke 212 and the common magnetic portion 23; at the same time, the top surface height of the side magnetic portion 24 is lower than the top surface height of the common magnetic portion 23, and the protruding direction of the second fold ring 315 is opposite to the protruding direction of the first fold ring 313, and the second fold ring 315 is at least partially opposite to the side magnetic circuit 24. When the sound-emitting device 100 is installed in a sound module or an electronic device, the sound output area of ​​the front cavity can be increased, which facilitates the smooth transmission of the sound waves of the diaphragm 31 and improves the sound quality effect of the sound-emitting device 100.

[0074] In one embodiment, the diaphragm 31 further includes a reinforcement portion, which is disposed on the straight portion 314. It can be understood that by providing the reinforcement portion, the structural strength of the diaphragm 31 can be effectively strengthened, thereby improving the connection stability of the first voice coil 32 and the second voice coil 33, and preventing the diaphragm 31 from tearing when the first voice coil 32 and the second voice coil 33 drive the diaphragm 31 to vibrate.

[0075] In one embodiment, a avoiding structure 234 is disposed at the periphery of the second common magnet 233 adjacent to the second magnetic gap 26 .

[0076] In this embodiment, if Figure 1 and Figure 2 As shown, by setting an avoidance structure 234 on the edge of the second common magnet 233 of the common magnetic part 23, that is, setting a rounded corner, a chamfered corner, a cut corner or a step structure on the edge of the second common magnet 233, the diaphragm 31 can be avoided, and magnetic leakage can be effectively prevented to improve the BL value.

[0077] Optionally, the avoidance structure 234 is at least one of an inclined surface, a rounded corner, a chamfer, and a step structure.

[0078] In one embodiment, the avoidance structure 234 may be an inclined slope. Optionally, the angle formed by the avoidance structure 234 and the surface of the second common magnet 233 facing away from the common magnetic conductive plate 232 is greater than 90° and less than 180°. In this embodiment, the angle formed by the inclined slope of the avoidance structure 234 and the surface of the second common magnet 233 facing away from the common magnetic conductive plate 232 may further be in the range of 100° to 150°, which is not limited here. Optionally, the angle is 100°, 110°, 120°, 130°, 140°, 150°, etc., which is not limited here.

[0079] It can be understood that the avoidance structure 234 surrounds the periphery of the second common magnet 233 on the side facing away from the common magnetic conductive plate 232, that is, the avoidance structure 234 is an integral annular inclined surface. Of course, in other embodiments, the avoidance structure 234 includes multiple avoidance structures 234, which are arranged at intervals and surround the periphery of the second common magnet 233 on the side facing away from the common magnetic conductive plate 232. At this time, the two adjacent avoidance structures 234 are not connected and have a certain spacing. Alternatively, the avoidance structure 234 includes multiple, adjacent avoidance structures 234 are connected end to end to form a closed annular structure, and surround the periphery of the second common magnet 233 on the side facing away from the common magnetic conductive plate 232. At this time, the adjacent avoidance structures 234 in the multiple avoidance structures 234 are adjacent and form an annular structure. Optionally, the angles formed by the multiple avoidance structures 234 and the surface of the second common magnet 233 on the side facing away from the common magnetic conductive plate 232 can be the same, different, or at least partially the same, which is not limited here.

[0080] In one embodiment, the second magnetic yoke 212 includes a protrusion 2121 and an edge 2122 connected to the edge of the protrusion 2121, the protrusion 2121 passes through the inner ring hole 312, the protrusion 2121 faces the central magnetic part 22 to form a recessed groove 2123, the second central magnet 223 has a protrusion 224 protruding from the second common magnet 233, the protrusion 224 is accommodated and limited in the recessed groove 2123, and the inner periphery of the diaphragm 31 is connected to the edge 2122. That is, the inner ring part 311 of the diaphragm 31 is connected to the edge 2122.

[0081] In this embodiment, if Figure 1 and Figure 2 As shown, by setting the second yoke 212 as a protrusion 2121 passing through the inner ring hole 312, and setting an edge portion 2122 on the periphery of the protrusion 2121, it is convenient to connect the inner ring portion 311 of the diaphragm 31 with the edge portion 2122 to achieve sealing. It can be understood that when the sound-generating device 100 is applied to an electronic device, in order to reduce the Z-direction height of the electronic device, the protrusion 2121 of the sound-generating device 100 can be used to abut against the inner wall of the shell of the electronic device, without the need to increase the front cavity space, and the height difference between the protrusion 2121 and the vibration system 3 can be used to form a front sound cavity structure, which is not limited here.

[0082] It can be understood that by providing a recessed groove 2123 on the raised portion 2121 of the second magnetic yoke 212, part of the second central magnet 223 is accommodated and limited in the recessed groove 2123, that is, the second central magnet 223 has a protruding portion 224 protruding the second common magnet 233, and the protruding portion 224 is accommodated and limited in the recessed groove 2123. In this way, the second central magnet 223 of the central magnetic part 22 can be used to support and install the second magnetic yoke 212, and the magnet thickness of the second central magnet 223 can be increased, so that the magnetic field strength of the central magnetic part 22 can be further increased.

[0083] In one embodiment, the common magnetic portion 23 is provided with an avoidance gap 235 connecting the first magnetic gap 25 and the second magnetic gap 26; the vibration system 3 also includes a skeleton 34, the skeleton 34 includes a main body 341 and a connecting portion 342 connected to the main body 341, the main body 341 is connected to the diaphragm 31, the connecting portion 342 is located in the avoidance gap 235, and the two ends of the connecting portion 342 are respectively connected to the first voice coil 32 and the second voice coil 33.

[0084] In this embodiment, if Figures 1 to 3 As shown, by setting the skeleton 34, the first voice coil 32 and the second voice coil 33 are connected to the diaphragm 31 through the skeleton 34, so that the first voice coil 32 and the second voice coil 33 can be ensured to be in a more reasonable magnetic field, that is, the area with the largest magnetic flux density, thereby effectively improving the BL value.

[0085] In one embodiment, the skeleton 34 includes a main body 341 and a connecting portion 342 . The main body 341 is connected to the diaphragm 31 . The connecting portion 342 is located in the avoidance gap 235 , so that two ends of the connecting portion 342 are respectively connected to the first voice coil 32 and the second voice coil 33 .

[0086] It can be understood that when there is only one skeleton 34 , optionally, the main body 341 is arranged in a rectangular ring, and the connecting parts 342 include multiple connecting parts 342 , which are respectively arranged at the four corners of the main body 341 , and the common magnetic part 23 is provided with an avoidance gap 235 corresponding to each connecting part 342 .

[0087] In this embodiment, the main body 341 of the skeleton 34 is connected to the straight portion 314 of the diaphragm 31, and a plurality of connecting portions 342 are arranged at intervals. Optionally, the plurality of connecting portions 342 are arranged corresponding to the four corners of the main body 341. The common magnetic portion 23 is provided with an avoidance gap 235 corresponding to each connecting portion 342, so that each connecting portion 342 is located in an avoidance gap 235. Optionally, the four corners of the common magnetic portion 23 are respectively provided with avoidance gaps 235.

[0088] Of course, the skeleton 34 may also include multiple skeletons, for example, the skeleton 34 includes two or four skeletons. Optionally, the skeleton 34 includes two skeletons, and the diaphragm 31 has two long axis sides and two short axis sides connected end to end; the two skeletons 34 are arranged at intervals along the long axis sides or the short axis sides, and are symmetrically arranged. Each skeleton 34 includes a main body 341 and two connecting parts 342. Optionally, the skeleton 34 includes four skeletons, and the four skeletons 34 are respectively arranged corresponding to the four corners of the common magnetic part 23. Each skeleton 34 includes a main body 341 and a connecting part 342.

[0089] In this embodiment, the side magnetic part 24 and the common magnetic part 23 are optionally both arranged in a rectangular frame. Optionally, each corner position of the common magnetic part 23 is provided with an avoidance gap 235. Optionally, the number of the connecting parts 342 of the skeleton 34 is consistent with the number of the avoidance gaps 235, and they are arranged one by one, which is not limited here.

[0090] In one embodiment, if Figure 1 and Figure 5 As shown, a first connection surface 3421 and a second connection surface 3422 are respectively provided at two ends of the connection portion 342 . The first connection surface 3421 is connected to the first voice coil 32 , and the second connection surface 3422 is connected to the second voice coil 33 .

[0091] In this embodiment, the first connection surface 3421 is connected to the outer side wall of the first voice coil 32. The first connection surface 3421 is arranged corresponding to the corner position of the first voice coil 32, and the first connection surface 3421 can be optionally arranged as a concave arc surface. The second connection surface 3422 is connected to the inner side wall of the second voice coil 33. The second connection surface 3422 is arranged corresponding to the corner position of the second voice coil 33, and the second connection surface 3422 can be optionally arranged as a convex arc surface, which is not limited here.

[0092] In one embodiment, an escape space 13 is formed between the edge magnet portion 24 and the outer shell 1; the vibration system 3 also includes a centering support plate 35, one end of the centering support plate 35 is connected to the outer shell 1, and the other end of the centering support plate 35 is located in the escape space 13; the skeleton 34 includes an extension portion 343, one end of the extension portion 343 is connected to the periphery of the main body portion 341, and the other end of the extension portion 343 extends toward the centering support plate 35 and is connected to the centering support plate 35.

[0093] In this embodiment, if Figure 1 and Figure 3 As shown, by setting an escape space 13 between the housing 1 and the edge magnetic part 24, and setting a centering support 35, the centering support 35 is fixed to the housing 1, and one end of the centering support 35 extends to the escape space 13, and by setting an extension portion 343 on the frame 34, the extension portion 343 extends toward the centering support 35 and is connected to the centering support 35, so that the lead wires of the first voice coil 32 and the second voice coil 33 are guided to the centering support 35 through the frame 34, and are guided to the housing 1 through the centering support 35, and are connected to the external circuit. The frame 34 not only plays the role of connecting and fixing the first voice coil 32 and the second voice coil 33, but also plays the role of preventing the first voice coil 32 and the second voice coil 33 from swinging or polarizing during vibration.

[0094] It can be understood that by providing the centering support plate 35, the lead wires of the first voice coil 32 and the second voice coil 33 can be connected to the external circuit by the centering support plate 35, and the swing or polarization of the first voice coil 32 and the second voice coil 33 during vibration can be avoided by the centering support plate 35.

[0095] In one embodiment, the housing 1 has a long side 11 and a short side 12 connected end to end, and the centering support pieces 35 include two. The two centering support pieces 35 are symmetrically arranged and respectively corresponding to the two long sides 11 or the two short sides 12 .

[0096] In this embodiment, if Figure 1 and Figure 3As shown, the two centering supports 35 are symmetrically distributed along the direction of the two long sides 11 or the direction of the two short sides 12 of the housing 1. Each centering support 35 includes an outer fixing portion, an elastic wall portion and an inner fixing portion connected in sequence, the outer fixing portion is connected to the housing 1 and / or the edge magnetic portion 24, the inner fixing portion is connected to the extension portion 343, the inner fixing portion is provided with an inner pad, and the leads of the first voice coil 32 and the second voice coil 33 extend along the extension portion 343 to the inner pad.

[0097] In this embodiment, if Figure 1 and Figure 3 As shown, the outer fixing portion, the elastic wall portion and the inner fixing portion of the centering support 35 can be an integrally formed structure. This can effectively ensure the structural strength of the centering support 35 and simplify the processing steps of the centering support 35. It can be understood that in order to ensure the deformation ability of the centering support 35, the elastic wall portion has at least one bend.

[0098] Optionally, the outer fixing portion, the elastic wall portion and the inner fixing portion of the centering support piece 35 may be located in the same plane. Of course, in other embodiments, the outer fixing portion and the inner fixing portion of the centering support piece 35 may also be located in different planes.

[0099] In one embodiment, the first center magnet 221 and the second center magnet 223 are both magnetized along the vibration direction of the vibration system 3, and the magnetic poles of the first center magnet 221 and the second center magnet 223 near the center magnetic conductive plate 222 are the same; the first common magnet 231 and the second common magnet 233 are both magnetized along the vibration direction of the vibration system 3, and the magnetic poles of the first common magnet 231 and the second common magnet 233 near the common magnetic conductive plate 232 are the same; the magnetic poles of the first center magnet 221 and the second center magnet 223 near the center magnetic conductive plate 222 are opposite to the magnetic poles of the first common magnet 231 and the second common magnet 233 near the common magnetic conductive plate 232.

[0100] In this embodiment, if Figure 1 and Figure 2 As shown, the vibration direction of the vibration system 3 can be selected as the vertical direction. Optionally, the first common magnet 231 and the second common magnet 233 of the common magnetic part 23 are magnetized in the vertical direction, and the first central magnet 221 and the second central magnet 223 of the central magnetic part 22 are magnetized in the vertical direction.

[0101] It should be noted that Figure 2The arrow direction in the magnetic circuit system 2 is from the S pole to the N pole, i.e., the magnetization direction. The first center magnet 221 and the second center magnet 223 of the center magnetic part 22 are magnetized in the vertical direction in opposite directions; the first common magnet 231 and the second common magnet 233 of the common magnetic part 23 are magnetized in the vertical direction in opposite directions. It can be understood that such an arrangement allows the center magnetic part 22, the common magnetic part 23 and the side magnetic part 24 to form a magnetic circuit that passes through the first voice coil 32 and the second voice coil 33 in the first magnetic gap 25 and the second magnetic gap 26.

[0102] It can be understood that the magnetization direction of the first center magnet 221 is opposite to the magnetization direction of the second center magnet 223, so that the magnetic flux lines of the first center magnet 221 and the second center magnet 223 of the center magnetic part 22 are gathered on the center magnetic conductive plate 222, and the magnetic field with a stronger magnetic field strength generated by the center magnetic part 22 passes through the first magnetic gap 25, thereby increasing the density of the magnetic flux of the first magnetic gap 25, increasing the number of magnetic flux lines passing through the first voice coil 32, and increasing the magnetic field force on the first voice coil 32, thereby effectively improving the BL value. At the same time, the magnetization direction of the first common magnet 231 is opposite to that of the second common magnet 233, so that the magnetic flux lines of the first common magnet 231 and the second common magnet 233 of the common magnetic part 23 are gathered on the common magnetic conductive plate 232, and the magnetic field with a stronger magnetic field strength generated by the common magnetic part 23 passes through the first magnetic gap 25 and the second magnetic gap 26, thereby increasing the density of the magnetic flux of the first magnetic gap 25 and the second magnetic gap 26, increasing the number of magnetic flux lines passing through the first voice coil 32 and the second voice coil 33, and increasing the magnetic field force on the first voice coil 32 and the second voice coil 33, thereby effectively improving the BL value.

[0103] In this embodiment, when the first central magnet 221 is magnetized from top to bottom, the second central magnet 223 is magnetized from bottom to top, the first common magnet 231 is magnetized from bottom to top, and the second common magnet 233 is magnetized from top to bottom, that is, the N pole of the first central magnet 221 is at the bottom and the S pole is at the top, the N pole of the second central magnet 223 is at the top and the S pole is at the bottom, the N pole of the first common magnet 231 is at the top and the S pole is at the bottom, and the N pole of the second common magnet 233 is at the bottom and the S pole is at the top, and vice versa.

[0104] It can be understood that the first central magnet 221 and the second central magnet 223 have the same magnetic poles near the central magnetic plate 222, that is, the magnetic poles of the first central magnet 221 and the second central magnet 223 near the central magnetic plate 222 are both N poles or S poles. The first common magnet 231 and the second common magnet 233 have the same magnetic poles near the common magnetic plate 232, that is, the magnetic poles of the first common magnet 231 and the second common magnet 233 near the common magnetic plate 232 are both S poles or N poles.

[0105] In this embodiment, when the magnetic poles of the first central magnet 221 and the second central magnet 223 close to the central magnetic conductive plate 222 are both N poles, the magnetic poles of the first common magnet 231 and the second common magnet 233 close to the common magnetic conductive plate 232 are both S poles, and vice versa. Such an arrangement allows the central magnetic portion 22 and the side magnetic portion 24 to form a magnetic circuit of the first voice coil 32 passing through the first magnetic gap 25 and the second magnetic gap 26, which is not limited here.

[0106] In one embodiment, the first center magnet 221 includes multiple first center magnets 221, which are arranged adjacent to each other and located between the central magnetic plate 222 and the first magnetic yoke 211 of the magnetic yoke 21; wherein the multiple first center magnets 221 are all magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple first center magnets 221 are the same.

[0107] Optionally, multiple first center magnets 221 are laid flat between the first magnetic yoke 211 of the magnetic yoke 21 and the center magnetic plate 222. Multiple first center magnets 221 are magnetized in the vertical direction, and the magnetization directions of multiple first center magnets 221 are the same. That is, multiple first center magnets 221 are magnetized in the direction of movement of the first voice coil 32, and multiple first center magnets 221 are magnetized upward or downward at the same time, which is not limited here.

[0108] In one embodiment, the second center magnet 223 includes a plurality of second center magnets 223, which are adjacently arranged and located on the side of the center magnetic conductive plate 222 facing away from the first center magnet 221; wherein the plurality of second center magnets 223 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the plurality of second center magnets 223 are the same.

[0109] Optionally, multiple second center magnets 223 are laid flat on the side of the center magnetic conductive plate 222 facing away from the first center magnet 221. Multiple second center magnets 223 are magnetized in the vertical direction, and the magnetization directions of multiple second center magnets 223 are the same. That is, multiple second center magnets 223 are magnetized in the direction of movement of the first voice coil 32, and multiple second center magnets 223 are magnetized upward or downward at the same time, which is not limited here.

[0110] In one embodiment, the first common magnet 231 includes a plurality of first common magnets 231, which are arranged adjacent to each other and located between the common magnetic plate 232 and the first magnetic yoke 211 of the magnetic yoke 21; wherein the plurality of first common magnets 231 are all magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the plurality of first common magnets 231 are the same.

[0111] Optionally, a plurality of first common magnets 231 are laid flat between the first magnetic yoke 211 of the magnetic yoke 21 and the common magnetic conductive plate 232. The plurality of first common magnets 231 are all magnetized in the vertical direction, and the magnetization directions of the plurality of first common magnets 231 are the same. That is, the plurality of first common magnets 231 are all magnetized in the direction in which the first voice coil 32 moves, and the plurality of first common magnets 231 are magnetized upward or downward at the same time, which is not limited here.

[0112] In one embodiment, the second common magnet 233 includes a plurality of second common magnets 233 which are arranged adjacent to each other and located on the side of the common magnetic conductive plate 232 facing away from the first common magnet 231; wherein the plurality of second common magnets 233 are all magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the plurality of second common magnets 233 are the same.

[0113] Optionally, the plurality of second common magnets 233 are laid flat on the side of the common magnetic conductive plate 232 facing away from the first common magnet 231. The plurality of second common magnets 233 are all magnetized in the vertical direction, and the magnetization directions of the plurality of second common magnets 233 are the same. That is, the plurality of second common magnets 233 are all magnetized in the direction in which the first voice coil 32 moves, and the plurality of second common magnets 233 are magnetized upward or downward at the same time, which is not limited here.

[0114] In one embodiment, the edge magnet portion 24 includes a stacked edge magnet 241 and an edge magnetic conductive plate 242, the edge magnet 241 is connected to the magnetic conductive yoke 21, and the edge magnetic conductive plate 242 is connected to the outer shell 1; wherein the edge magnet 241 is magnetized along the vibration direction of the vibration system 3, the magnetic pole of the edge magnet 241 close to the edge magnetic conductive plate 242 is the same as the magnetic pole of the first center magnet 221 close to the center magnetic conductive plate 222, and the magnetic pole of the edge magnet 241 close to the edge magnetic conductive plate 242 is opposite to the magnetic pole of the first common magnet 231 close to the common magnetic conductive plate 232.

[0115] In this embodiment, if Figure 2 As shown, the magnetization direction of the side magnet 241 of the side magnet portion 24 is the same as the magnetization direction of the first center magnet 221, and is opposite to the magnetization direction of the first common magnet 231. Optionally, the magnetic pole of the side magnet 241 close to the side magnetic conductive plate 242 is the same as the magnetic pole of the first center magnet 221 close to the center magnetic conductive plate 222, and the magnetic pole of the side magnet 241 close to the side magnetic conductive plate 242 is opposite to the magnetic pole of the first common magnet 231 close to the common magnetic conductive plate 232, which is not limited here.

[0116] It can be understood that when the first center magnet 221 is magnetized from bottom to top, the side magnet 241 is magnetized from bottom to top; or, when the first center magnet 221 is magnetized from top to bottom, the side magnet 241 is magnetized from top to bottom, which is not limited here. That is, when the N pole of the first center magnet 221 is at the top and the S pole is at the bottom, the N pole of the side magnet 241 is at the top and the S pole is at the bottom; or, when the N pole of the first center magnet 221 is at the bottom and the S pole is at the top, the N pole of the side magnet 241 is at the bottom and the S pole is at the top, which is not limited here.

[0117] Optionally, the side magnetic conductive plate 242 of the side magnetic portion 24 can be bonded to the housing 1. In this embodiment, the side magnetic conductive plate 242 and the housing 1 can be an integrally formed structure.

[0118] In one embodiment, a projection of at least part of the common magnetic conductive plate 232 along a vibration direction perpendicular to the vibration system 3 coincides with a projection of the first voice coil 32 and the second voice coil 33 along a vibration direction perpendicular to the vibration system 3 .

[0119] It can be understood that such a configuration makes the magnetic flux lines of the first common magnet 231 and the second common magnet 233 of the common magnetic part 23 gather on the common magnetic conductive plate 232 and pass through the first magnetic gap 25 and the second magnetic gap 26, thereby increasing the density of the magnetic flux of the first magnetic gap 25 and the second magnetic gap 26, so that the first voice coil 32 and the second voice coil 33 are in a more reasonable magnetic field, so as to alleviate the distortion of the audio output by the sound device 100 and improve the sound quality of the audio output by the sound device 100. Optionally, the projection of the common magnetic conductive plate 232 in the horizontal direction is located in the projection of the first voice coil 32 and the second voice coil 33 in the horizontal direction.

[0120] Optionally, the thickness of the common magnetic conductive plate 232 is less than or equal to the thickness of the first common magnet 231 , and the thickness of the common magnetic conductive plate 232 is less than or equal to the thickness of the second common magnet 233 , which is not limited here.

[0121] In one embodiment, a projection of at least a portion of the central magnetic conductive plate 222 along a vibration direction perpendicular to the vibration system 3 coincides with a projection of the first voice coil 32 along a vibration direction perpendicular to the vibration system 3 .

[0122] It can be understood that such a configuration makes the magnetic flux lines of the first central magnet 221 and the second central magnet 223 of the central magnetic part 22 gather on the central magnetic plate 222 and pass through the first magnetic gap 25, thereby increasing the density of the magnetic flux of the first magnetic gap 25, so that the first voice coil 32 is in a more reasonable magnetic field, so as to alleviate the distortion of the audio output by the sound device 100 and improve the sound quality of the audio output by the sound device 100. Optionally, the projection of the central magnetic plate 222 in the horizontal direction is located in the projection of the first voice coil 32 in the horizontal direction.

[0123] Optionally, the thickness of the central magnetic conductive plate 222 is less than or equal to the thickness of the first central magnet 221, and the thickness of the central magnetic conductive plate 222 is less than or equal to the thickness of the second central magnet 223, which is not limited here. In this embodiment, the thickness of the central magnetic conductive plate 222 can be optionally equivalent to the thickness of the common magnetic conductive plate 232.

[0124] In this embodiment, if Figure 1 and Figure 2 As shown, the thickness of the first central magnet 221 along the vibration direction of the vibration system 3 may be the same as the thickness of the first common magnet 231 along the vibration direction of the vibration system 3. Optionally, the thickness of the central magnetic conductive plate 222 along the vibration direction of the vibration system 3 may be the same as the thickness of the side magnetic conductive plate 242 along the vibration direction of the vibration system 3.

[0125] In one embodiment, the thickness of the second central magnet 223 along the vibration direction of the vibration system 3 is greater than the thickness of the second common magnet 233 along the vibration direction of the vibration system 3. That is, the side surface of the second central magnet 223 facing away from the central magnetic plate 222 protrudes from the side surface of the second common magnet 233 facing away from the common magnetic plate 232 to form a protrusion 224. That is, the thickness of the central magnetic part 22 is greater than the thickness of the common magnetic part 23. In this way, under the limited reserved space, the size of the magnetic circuit system 2 can be maximized, and at the same time, the vibration area of ​​the diaphragm 31 is taken into account to ensure the sound performance of the sound-generating device 100.

[0126] It can be understood that the vibration system 3 is provided with a through structure for the protrusion to pass through. When the sound-generating device 100 is applied to an electronic device, in order to reduce the Z-direction height of the electronic device, the protrusion 224 of the magnetic circuit system 2 in the sound-generating device 100 can be used to abut against the inner wall of the shell of the electronic device. There is no need to increase the front cavity space additionally. The front sound cavity structure can be formed by utilizing the height difference between the protrusion 224 of the magnetic circuit system 2 and the vibration system 3, which is not limited here.

[0127] Of course, in other implementations, the thickness of the second central magnet 223 along the moving direction of the first voice coil 32 may be the same as the thickness of the second common magnet 233 along the moving direction of the first voice coil 32. The diaphragm 31 of the vibration system 3 and the central magnetic part 22 are arranged opposite to each other and spaced apart; or, the diaphragm 31 of the vibration system 3 and the central magnetic part 22 are connected and sealed, which is not limited here.

[0128] In one embodiment, the common magnetic portion 23 includes a plurality of common magnetic portions 23 , which are disposed around the outer side of the central magnetic portion 22 , and adjacent common magnetic portions 23 are connected end to end to form a closed ring structure.

[0129] It can be understood that each of the multiple common magnetic parts 23 includes a first common magnet 231, a common magnetic conductive plate 232 and a second common magnet 233 that are stacked. At this time, adjacent first common magnets 231 in adjacent common magnetic parts 23 are connected end to end to form a closed ring structure, adjacent common magnetic conductive plates 232 are connected end to end to form a closed ring structure, and adjacent second common magnets 233 are connected end to end to form a closed ring structure, so that multiple common magnetic parts 23 are connected end to end to form a closed ring structure, which is not limited here.

[0130] In one embodiment, if Figure 1 and Figure 3 As shown, the common magnetic portion 23 includes a plurality of common magnetic portions 23 , which are disposed around the outer side of the central magnetic portion 22 , and adjacent common magnetic portions 23 are spaced to form gaps.

[0131] It can be understood that each of the multiple shared magnetic parts 23 includes a first shared magnet 231, a shared magnetic plate 232, and a second shared magnet 233 that are stacked. At this time, the adjacent first shared magnets 231 in the adjacent shared magnetic parts 23 are spaced to form a gap, the adjacent shared magnetic plates 232 are spaced to form a gap, and the adjacent second shared magnets 233 are spaced to form a gap, so that the multiple shared magnetic parts 23 are spaced and surrounded to form a ring structure with a gap, which is not limited here. Optionally, the gap formed by the spacing between adjacent shared magnetic parts 23 is an avoidance gap 235.

[0132] In this embodiment, the first common magnet 231 and the second common magnet 233 of the common magnetic part 23 may be selected as permanent magnets. It can be understood that the first common magnet 231, the common magnetic plate 232 and the second common magnet 233 of the common magnetic part 23 are stacked along the moving direction of the first voice coil 32, that is, the first common magnet 231 is connected to the first magnetic yoke 211 of the magnetic yoke 21, the second common magnet 233 is connected to the second magnetic yoke 212 of the magnetic yoke 21, the common magnetic plate 232 is stacked between the first common magnet 231 and the second common magnet 233, and the second common magnet 233 is stacked on the side of the common magnetic plate 232 facing away from the first common magnet 231.

[0133] In one embodiment, the sound-emitting device 100 is installed in the shell 400 of the sound-emitting module 500, and forms a front cavity 420 and a rear cavity 430 between the shell 400. The shell 400 is provided with a sound outlet hole 410 connected to the front cavity 420, and the sound waves of the diaphragm 31 are radiated to the outside through the sound outlet hole 410; wherein, the volume of the rear cavity 430 is ≤1.5cc.

[0134] In this embodiment, if Figure 6As shown, the housing 400 of the sound module 500 has an installation space, and the sound device 100 is arranged in the installation space of the housing 400, and forms a front cavity 420 and a rear cavity 430 separated from the housing 400. In order to facilitate the smooth transmission of the sound generated by the diaphragm 31 of the sound device 100 to the outside, the housing 400 is provided with a sound outlet 410 connected to the front cavity 420, so that the sound waves of the diaphragm 31 are radiated to the outside through the sound outlet 410.

[0135] It is understandable that in order to balance the air pressure inside the sound-generating device 100, the sound-generating device 100 is also provided with a pressure relief hole, so that when the diaphragm 31 vibrates, the sound waves on the side of the diaphragm 31 facing away from the front cavity 420 are radiated to the rear cavity 430 through the pressure relief hole, thereby balancing the air pressure on both sides of the diaphragm 31. Optionally, the pressure relief hole is provided on the housing 1 of the sound-generating device 100; or, the pressure relief hole is provided on the magnetic yoke 21 of the magnetic circuit system 2 of the sound-generating device 100, which is not limited here. In this embodiment, the pressure relief hole is optionally provided on the first magnetic yoke 211 of the magnetic yoke 21 of the magnetic circuit system 2.

[0136] In this embodiment, the sound device 100 is installed in the housing 400 of the sound module 500, and the volume of the rear cavity 430 is optionally less than or equal to 1.5cc. Optionally, the volume of the rear cavity 430 is 1.5cc, 1.4cc, 1.3cc, 1.2cc, 1.1cc, 1cc, 0.9cc, 0.8cc, 0.7cc, 0.6cc, 0.5cc, 0.4cc, 0.3cc, 0.2cc, 0.1cc, etc., which is not limited here.

[0137] It can be understood that by setting the magnetic circuit system 2 of the sound-generating device 100 to include a magnetic yoke 21 and a central magnetic portion 22, a common magnetic portion 23 and a side magnetic portion 24 provided on the magnetic yoke, the central magnetic portion 22 and the side magnetic portion 24 share the common magnetic portion 23, and form a first magnetic gap 25 and a second magnetic gap 26 respectively, and setting the vibration system 3 to an inner and outer double voice coil structure, the first voice coil 32 is arranged corresponding to the first magnetic gap 25, and the second voice coil 33 is arranged corresponding to the second magnetic gap 26, so that current is passed through the first voice coil 32 and the second voice coil 33, so that the two voice coils vibrate in the magnetic fields of the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2 respectively and drive the diaphragm 31 to vibrate and produce sound, so as to improve the BL value, and at the same time, the first voice coil 32 and the second voice coil 33 can make full use of the magnetic fields of the central magnetic portion 22 and the common magnetic portion 23, improve the magnetic energy utilization rate of the magnetic circuit system 2, thereby improving the loudness and sensitivity of the sound-generating device 100, so as to improve product performance.

[0138] The present invention further provides an electronic device, which includes the above-mentioned sound-generating device 100. The specific structure of the sound-generating device 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 described one by one here.

[0139] In one embodiment, the electronic device further includes a device housing, the device housing has an installation space, and the sound device 100 is disposed in the installation space of the device housing. Of course, in other embodiments, the electronic device may include a sound module 500, which is not limited here.

[0140] In this embodiment, the electronic device further includes a flexible circuit board, one end of which is electrically connected to the sound-generating device 100, and the other end of which is used to connect to an external power source. It can be understood that the flexible circuit board is used to connect the external circuit to the first voice coil 32 and the second voice coil 33 of the sound-generating device 100. The flexible circuit board is provided with an inner pad and an outer pad, the inner pad of the flexible circuit board is connected to the sound-generating device 100, and the outer pad of the flexible circuit board is used to connect to an external terminal.

[0141] In this embodiment, the device housing has an installation space, the sound device 100 is disposed in the installation space of the device housing, and at least one end of the flexible circuit board connected to the sound device 100 is located in the installation space of the device housing. Of course, in other embodiments, the flexible circuit board can also be entirely disposed in the installation space of the device housing, which is not limited here.

[0142] It is understandable that the electronic device can be headphones, mobile phones, MP3, MP4, computers, tablet computers, smart wearable devices, etc., which are not limited here. In the electronic device, the sound device 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 single body.

[0143] 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-generating device, characterized in that: The sound-generating device comprises: shell; a magnetic circuit system connected to one end of the housing, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion, a common magnetic portion and a side magnetic portion arranged on the magnetic yoke, the common magnetic portion being located outside the central magnetic portion and spaced apart from the central magnetic portion to form a first magnetic gap, the side magnetic portion being located outside the common magnetic portion and spaced apart from the common magnetic portion to form a second magnetic gap, the central magnetic portion comprising a first central magnet, a central magnetic plate and a second central magnet arranged in a stacked manner, and the common magnetic portion comprising a first common magnet, a common magnetic plate and a second common magnet arranged in a stacked manner; and A vibration system, the vibration system comprising a diaphragm and a first voice coil and a second voice coil connected to the diaphragm, the diaphragm having an inner ring hole at the center, the outer periphery of the diaphragm being connected to the housing, the inner periphery of the diaphragm being connected to the magnetic circuit system, the first voice coil being arranged corresponding to the first magnetic gap, and the second voice coil being arranged corresponding to the second magnetic gap; Among them, the first central magnet, the central magnetic conductive plate and the second central magnet respectively correspond to the first common magnet, the common magnetic conductive plate and the second common magnet in a vibration direction perpendicular to the vibration system, and the thickness of the second central magnet along the vibration direction of the vibration system is greater than the thickness of the second common magnet along the vibration direction of the vibration system, and the top surface height of the diaphragm is lower than the top surface height of the magnetic circuit system.

2. The sound-generating device according to claim 1, characterized in that: The magnetically conductive yoke comprises a first magnetic yoke and a second magnetic yoke, the central magnetic portion, the common magnetic portion and the edge magnetic portion are all arranged on the first magnetic yoke, the second magnetic yoke is connected to the central magnetic portion and the end of the common magnetic portion away from the first magnetic yoke, the first central magnet and the first common magnet are connected to the first magnetic yoke, and the second central magnet and the second common magnet are connected to the second magnetic yoke; The second magnetic yoke includes a protruding portion and a border portion connected to the edge of the protruding portion, the protruding portion passes through the inner ring hole and forms a recessed groove facing the central magnetic portion, the second central magnet has a protruding portion protruding from the second common magnet, the protruding portion is accommodated and confined in the recessed groove, and the inner periphery of the diaphragm is connected to the border portion.

3. The sound-generating device according to claim 2, characterized in that: The diaphragm includes an inner ring portion, a first folded ring arranged around the inner ring portion, a straight portion arranged around the first folded ring, a second folded ring arranged around the straight portion, and a fixed portion connected to the outer side of the second folded ring, the fixed portion is connected to the outer shell, the inner ring portion is formed with the inner ring hole, and the inner ring portion is connected to the edge portion.

4. The sound-generating device according to claim 3, characterized in that: The inner ring portion, the first fold ring, the straight portion, the second fold ring and the fixing portion are an integrally formed structure; And / or, the top surface height of the edge magnetic portion is lower than the top surface height of the common magnetic portion, the protrusion direction of the first fold ring is toward the direction away from the magnetic circuit system, the protrusion direction of the second fold ring is opposite to the protrusion direction of the first fold ring, the first fold ring is at least partially opposite to the second magnetic gap, and the second fold ring is at least partially opposite to the edge magnetic circuit portion; And / or, a avoidance structure is provided at the periphery of the second common magnet adjacent to the second magnetic gap.

5. The sound generating device according to claim 1, characterized in that: The common magnetic part is provided with an escape gap connecting the first magnetic gap and the second magnetic gap; The vibration system also includes a skeleton, which includes a main body and a connecting part connected to the main body, the main body is connected to the diaphragm, the connecting part is located in the avoidance gap, and two ends of the connecting part are respectively connected to the first voice coil and the second voice coil.

6. The sound generating device according to claim 5, characterized in that: An escape space is formed between the edge magnetic portion and the shell; The vibration system further comprises a centering support plate, one end of which is connected to the housing, and the other end of which is located in the avoidance space; The frame includes an extension portion, one end of which is connected to the periphery of the main body portion, and the other end of which extends toward the centering support piece and is connected to the centering support piece.

7. The sound generating device according to claim 6, characterized in that: The main body is arranged in a rectangular ring, the connecting parts include a plurality of connecting parts, the plurality of connecting parts are arranged corresponding to the four corners of the main body respectively, and the common magnetic part is provided with an avoidance notch corresponding to each connecting part; And / or, a first connecting surface and a second connecting surface are respectively provided at two ends of the connecting portion, the first connecting surface is connected to the first voice coil, and the second connecting surface is connected to the second voice coil; And / or, the shell has a long side and a short side connected end to end, the centering support plates include two, the two centering support plates are symmetrically arranged and respectively correspond to the two long sides or the two short sides.

8. The sound generating device according to any one of claims 1 to 7, characterized in that: The first central magnet and the second central magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles of the first central magnet and the second central magnet close to the central magnetic conductive plate are the same; The first common magnet and the second common magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles of the first common magnet and the second common magnet close to the common magnetic conductive plate are the same; The magnetic poles of the first central magnet and the second central magnet close to the central magnetic conductive plate are opposite to the magnetic poles of the first common magnet and the second common magnet close to the common magnetic conductive plate.

9. The sound-generating device according to claim 8, characterized in that: The edge magnetic part includes a stacked edge magnet and an edge magnetic conductive plate, the edge magnet is connected to the magnetic conductive yoke, and the edge magnetic conductive plate is connected to the housing; Among them, the side magnets are magnetized along the vibration direction of the vibration system, the magnetic poles of the side magnets close to the side magnetic conductive plates are the same as the magnetic poles of the first center magnets close to the center magnetic conductive plates, and the magnetic poles of the side magnets close to the side magnetic conductive plates are opposite to the magnetic poles of the first common magnets close to the common magnetic conductive plates.

10. The sound generating device according to any one of claims 1 to 7, characterized in that: The sound-generating device is installed in the shell of the sound-generating module, and forms a front cavity and a rear cavity between the shell and the sound-generating device. The shell is provided with a sound outlet hole connected to the front cavity, and the sound waves of the diaphragm are radiated to the outside through the sound outlet hole, wherein the volume of the rear cavity is ≤1.5cc.

11. An electronic device, characterized in that: The electronic device comprises the sound emitting device according to any one of claims 1 to 10.

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