Sound production monomer and electronic equipment

Abstract

The invention provides a sound production monomer and electronic equipment. The sound production monomer comprises a bracket, a magnetic circuit system and a vibration system, the magnetic circuit system comprises a central magnetic circuit, a middle magnetic circuit, a side magnetic circuit, a first magnetic conductive plate and a second magnetic conductive plate, a first magnetic gap and a second magnetic gap are respectively formed between the middle magnetic circuit and the side magnetic circuit as well as between the middle magnetic circuit and the central magnetic circuit, and a first through hole is formed in the first magnetic conductive plate; airflow channels are formed between the central magnetic circuit and the first magnetic conductive plate as well as between the middle magnetic circuit and the second magnetic conductive plate; the vibration system comprises a first vibrating diaphragm and a second vibrating diaphragm; the first vibrating diaphragm comprises a first folding ring, the first folding ring is provided with a second through hole communicated with the first through hole, sound waves of the second vibrating diaphragm radiate outwards through the first through hole and the second through hole, and the sound waves of the first vibrating diaphragm and the second vibrating diaphragm radiate outwards on the same side of the sound production single body. According to the invention, the problem that the vibration area and the vibration displacement of the existing sound production monomer cannot meet the requirements of wearable audio products such as OWS earphones can be solved.

Description

Technical Field

[0001] The present invention relates to the field of sound generation technology, and more specifically, to a sound generation unit and an electronic device. Background Art

[0002] In recent years, with the development of smart wearable electronic products, smart wearable products have higher and higher requirements on the performance of single units, especially the requirements of OWS (Open Wearable Stereo) Bluetooth headsets are different from TWS (True Wireless Stereo). Because the whole machine adopts a non-in-ear method to reflect the convenience and comfort of wearing, it is urgent to improve the performance of the sound unit.

[0003] Traditional Driver designs all use single-sided vibration to generate sound. In the cavity of the entire machine with limited internal space, it is difficult to increase the vibration area and vibration displacement. Therefore, there is limited room for improving the performance of the sound unit, which cannot meet the needs of existing wearable audio products such as OWS. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a sound unit and an electronic device to solve the problem that the vibration area and vibration displacement of the existing sound unit cannot meet the needs of wearable audio products such as OWS headphones.

[0005] The present invention provides a sound-generating unit, comprising: a bracket, and

[0006] A magnetic circuit system connected to the bracket includes a central magnetic circuit, an intermediate magnetic circuit, a side magnetic circuit, a first magnetic conductive plate for connecting the central magnetic circuit and the intermediate magnetic circuit, and a second magnetic conductive plate for connecting the side magnetic circuit and the intermediate magnetic circuit, wherein the side magnetic circuit is arranged around the intermediate magnetic circuit to form a first magnetic gap, the intermediate magnetic circuit is arranged around the central magnetic circuit to form a second magnetic gap, a first through hole is arranged on the first magnetic conductive plate, an air flow channel connected to the first through hole is formed between the central magnetic circuit and the first magnetic conductive plate, the air flow channel is located outside the central magnetic circuit and the two sides are connected to the second magnetic gap and the first through hole respectively;

[0007] The vibration system includes a first diaphragm and a second diaphragm connected to both sides of a bracket, a first voice coil connected to the first diaphragm, and a second voice coil connected to the second diaphragm, wherein the first voice coil is located in a first magnetic gap and the second voice coil is located in a second magnetic gap; wherein,

[0008] The first diaphragm includes a first fold ring, a second fold ring located outside the first fold ring, and a vibrating part located between the first fold ring and the second fold ring, the vibrating part is connected to the first voice coil, the first fold ring is connected to the first magnetic conductive plate and has a second through hole connected to the first through hole, the sound waves of the second diaphragm are radiated outward through the first through hole and the second through hole, and the sound waves of the first diaphragm and the second diaphragm are radiated outward on the same side of the sound-emitting unit.

[0009] Preferably, the first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves with the same phase outwardly.

[0010] Preferably, the first magnetic conductive plate includes a top connected to the central magnetic circuit, a bottom connected to the middle magnetic circuit, and a connecting portion for connecting the top and the bottom, the connecting portion is not coplanar with the top and the bottom, a first through hole is opened at the top, the central magnetic circuit is connected to the top, and the central magnetic circuit is spaced apart from the connecting portion and the bottom, so that an air flow channel is formed between the central magnetic circuit and the first magnetic conductive plate.

[0011] Preferably, the central magnetic circuit has a central portion connected to the top and a peripheral portion located outside the central portion, the central portion is spaced apart from the connecting portion, and the top surface of the peripheral portion is lower than the bottom surface of the bottom; and / or,

[0012] The number of the first through holes is at least two, and the first through holes penetrate through and are spaced apart on the top.

[0013] Preferably, an avoidance groove is provided on the second magnetic conductive plate, and the avoidance groove provides an avoidance space for the first voice coil.

[0014] Preferably, the central magnetic circuit includes a central magnetic conductive plate and a central magnetic group arranged on the central magnetic conductive plate, the middle magnetic circuit includes a middle magnet, and the side magnetic circuit includes a side magnetic conductive plate and a side magnet, wherein:

[0015] The central magnetic group, the middle magnet and the side magnets are all magnetized along the vibration direction of the vibration system, and the magnetization directions of the central magnetic group and the middle magnet are opposite, and the magnetization directions of the middle magnet and the side magnets are opposite.

[0016] Preferably, the central magnetic group includes a first central magnet and a central annular magnet surrounding the first central magnet, the top end of the first central magnet is connected to the top, the bottom end of the first central magnet is connected to the central magnetic conductive plate, and the height of the first central annular magnet is lower than the height of the central magnet; or, the central magnetic group includes a first central magnet arranged on the central magnetic conductive plate and a second central magnet arranged on the first central magnet, the top of the second central magnet is connected to the top plate, and the width of the first central magnet is greater than the width of the second central magnet.

[0017] Preferably, a first cavity is formed between the first diaphragm, the bracket, the first magnetic conductive plate, the intermediate magnetic circuit and the second magnetic conductive plate, and a first leakage hole connecting the first cavity with the outside is provided on the sound-emitting unit; wherein,

[0018] The edge magnetic conductive plate is injection molded on the bracket, and the first leakage hole is formed by removing material from the edge magnetic conductive plate and the corresponding bracket area.

[0019] Preferably, the second diaphragm includes a third fold ring and a reinforcement portion, the third fold ring is arranged around the reinforcement portion, and the outer edge of the third fold ring is connected to the bracket.

[0020] Preferably, the sound unit also includes a back cover, which is located on the side of the second diaphragm away from the first diaphragm, a second cavity is formed between the second diaphragm and the back cover, and a second leakage hole connecting the second cavity and the outside is arranged on the back cover; and / or, the sound unit also includes two positioning rings, which are respectively arranged between the outer edge of the second fold ring and the bracket and between the outer edge of the third fold ring and the bracket.

[0021] The present invention also provides an electronic device, comprising a housing having a receiving cavity and a sound-emitting unit arranged in the receiving cavity, wherein the sound-emitting unit adopts the above-mentioned sound-emitting unit, wherein:

[0022] The sound-emitting unit divides the receiving cavity into a front cavity and a rear cavity isolated from each other. A sound outlet hole connected to the front cavity is arranged on the shell body. The sound waves of the first diaphragm and the second diaphragm of the sound-emitting unit are radiated to the outside through the sound outlet hole.

[0023] Preferably, a third leakage hole is further provided on the shell, and the third leakage hole is communicated with the rear cavity.

[0024] It can be seen from the above technical scheme that the sound-emitting unit and electronic device provided by the present invention drive the two diaphragms of the two voice coils to vibrate and produce sound through the magnetic circuit system, and a first through hole is provided on the magnetic circuit system, and a second through hole is provided on the first diaphragm that is connected to each other. The first through hole and the second through hole serve as sound outlet holes for the sound waves radiated by the second diaphragm, so that the sound waves of the first diaphragm and the second diaphragm are radiated outward on the same side of the sound-emitting unit, thereby realizing the same-direction sound emission of the double-sided diaphragms without increasing the external dimensions, and increasing the vibration area of ​​the vibration system, thereby achieving the purpose of improving performance; and, an air flow channel is formed between the central magnetic group and the first magnetic conductive plate, the middle magnetic circuit, and the second magnetic conductive plate, and the two sides of the air flow channel are respectively connected to the second magnetic gap and the first sound outlet hole, which is conducive to smoother airflow under the second diaphragm, thereby improving the high-frequency performance of the second diaphragm, thereby improving the high-frequency performance of the first diaphragm and the second diaphragm after superposition.

[0025] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the explosion structure of a sound-generating unit according to the first embodiment of the present invention;

[0028] Figure 2 is a cross-sectional view of a sound-emitting unit according to Embodiment 1 of the present invention;

[0029] Figure 3 A cross-sectional view of a sound-emitting unit according to the second embodiment of the present invention

[0030] Figure 4 is a schematic diagram of a three-dimensional structure of an electronic device according to an embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the sound unit according to an embodiment of the present invention.

[0032] The reference numerals include: 1, first diaphragm, 11, first fold ring, 12, second fold ring, 13, vibration part;

[0033] 2. second diaphragm, 21. third fold ring, 22. reinforcement part;

[0034] 3. First voice coil, 4. Second voice coil;

[0035] 5. Magnetic circuit system, 51. Side magnetic plate, 52. Center magnetic group, 521. First center magnet, 522. Center ring magnet, 523. Second center magnet, 53. Center magnetic plate, 54. Side magnet, 551. First magnetic plate, 552. Middle magnetic circuit, 553. Second magnetic plate, 55511. First through hole, 5512. Dust screen, 5513. Air flow channel, 5514. Top, 5515. Connecting part, 5516. Bottom, 5531. Groove;

[0036] 6. bracket, 61. first bracket, 62. second bracket, 63. first leakage hole, 64. damping element;

[0037] 71, a first positioning ring, 72, a second positioning ring;

[0038] 8. rear cover, 81. second leakage hole;

[0039] 91, upper shell, 92, lower shell, 911, sound outlet hole, 921, third leakage hole;

[0040] 10. First magnetic gap, 20. Second magnetic gap.

[0041] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0042] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

[0043] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In order to solve the aforementioned problem that the vibration area and vibration displacement of the existing sound-emitting unit cannot meet the requirements of wearable audio products such as OWS headphones, the present invention proposes a sound-emitting unit and an electronic device.

[0045] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] In order to illustrate the structure of the sound-generating unit provided by the present invention, Figure 1 , Figure 2 , Figure 3 and Figure 5 The structure of the sound unit is exemplarily indicated from different angles. Specifically, Figure 1 The explosion structure of the sound-generating monomer according to the first embodiment of the present invention is shown; Figure 2 The cross-sectional structure of the sound-emitting monomer according to the first embodiment of the present invention is shown; Figure 3 The cross-sectional structure of the sound-emitting monomer according to the second embodiment of the present invention is shown; Figure 5 The three-dimensional structure of the sound-emitting unit according to the embodiment of the present invention is shown.

[0047] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown together, the sound-emitting unit provided by the present invention includes a bracket 6, a magnetic circuit system 5 and a vibration system. The magnetic circuit system 5 is connected to the bracket 6, and includes a central magnetic circuit, an intermediate magnetic circuit 552, a side magnetic circuit, a first magnetic conductive plate 551 for connecting the central magnetic circuit and the intermediate magnetic circuit 552, and a second magnetic conductive plate 553 for connecting the side magnetic circuit and the intermediate magnetic circuit 552, wherein the side magnetic circuit is arranged around the intermediate magnetic circuit 552 to form a first magnetic gap 10, the intermediate magnetic circuit 552 is arranged around the central magnetic circuit to form a second magnetic gap 20, a first through hole 5511 is arranged on the first magnetic conductive plate 551, and an air flow channel 5513 is formed between the central magnetic circuit and the first magnetic conductive plate 551. The air flow channel 5513 is located on the outside of the central magnetic circuit and is connected to the second magnetic gap 20 and the first through hole 5511 on both sides; the vibration system and the bracket The first diaphragm 1 is connected to the bracket 6, and includes a first diaphragm 1 and a second diaphragm 2 connected to both sides of the bracket 6, a first voice coil 3 connected to the first diaphragm 1, and a second voice coil 4 connected to the second diaphragm 2, the first voice coil 3 is located in the first magnetic gap 10, and the second voice coil 4 is located in the second magnetic gap 20; wherein, the first diaphragm 1 includes a first folding ring 11, a second folding ring 12 located outside the first folding ring 11, and a vibrating portion 13 arranged between the first folding ring 11 and the second folding ring 12, the vibrating portion 12 is connected to the first voice coil 3, the first folding ring 11 is connected to the first magnetic conductive plate 551 and is provided with a second through hole connected to the first through hole 5511, the sound waves of the second diaphragm 2 are radiated outwardly through the first through hole 5511 and the second through hole, and the sound waves of the first diaphragm 1 and the second diaphragm 2 are radiated outwardly on the same side of the sound-emitting unit.

[0048] The sound-emitting unit provided in the present application drives two voice coils through a magnetic circuit system 5 to drive two diaphragms to vibrate and produce sound, and a first through hole 5511 is provided on the magnetic circuit system 5, and a second through hole connected to each other is provided on the first diaphragm 1. The first through hole 5511 and the second through hole serve as sound outlet holes for sound waves radiated by the second diaphragm 2, so that the sound waves of the two diaphragms are radiated outward on the same side of the sound-emitting unit, thereby achieving the effect of double-sided diaphragms emitting sound in the same direction without increasing the external dimensions of the sound-emitting unit, which is beneficial to and increases the vibration area of ​​the vibration system, thereby achieving the purpose of performance improvement; and, the airflow channel 5513 is provided between the central magnetic circuit and the first magnetic conductive plate 551, the middle magnetic circuit 552, and the second magnetic conductive plate 553, that is, the airflow channel surrounds the central magnetic circuit, and the two sides of the airflow channel 5513 are respectively connected to the second magnetic gap 20 and the first through hole, which is beneficial to smoother airflow under the second diaphragm 2, thereby improving the high-frequency performance of the second diaphragm 2, thereby improving the high-frequency performance of the first diaphragm 1 and the second diaphragm 2 after superposition.

[0049] The first diaphragm 1 and the second diaphragm 2 vibrate in the same direction and radiate sound waves of the same phase outward, thereby increasing the volume of the sound unit.

[0050] Optionally, the bracket 6 is cylindrical, and the outer peripheral contours of the first diaphragm 1 and the second diaphragm 2 are roughly aligned, which is convenient for the regular design of the shape of the sound unit, and further convenient for assembly in the whole machine, simplifying the reserved structure of the whole machine. Further optionally, the bracket 6 includes a cylindrical first bracket 61 and a cylindrical second bracket 62, and the first bracket 61 and the second bracket 62 are adapted to be connected to form a cylindrical bracket; the bracket is designed to be divided into a first bracket and a second bracket, and the first diaphragm 1 can be assembled through the first bracket 61, and the second diaphragm 2 can be assembled through the second bracket 62, which is convenient for the assembly of the sound unit during the assembly process, and conductive terminals can also be respectively provided on the first bracket and the second bracket, so as to facilitate the electrical connection of the first voice coil and the second voice coil with the external circuit respectively. Among them, a first leakage hole 63 is provided between the first bracket 61 and the second bracket 62, and a damping member 64 is provided in the first leakage hole 63, so that the air flow velocity and the sound resistance in the cavity of the sound unit can be further adjusted, thereby improving the performance of the sound unit.

[0051] In one embodiment, the magnetic circuit system 5 is connected to the bracket 6, and includes a central magnetic circuit, an intermediate magnetic circuit 552, a side magnetic circuit, a first magnetic conductive plate 551 for connecting the central magnetic circuit and the intermediate magnetic circuit, and a second magnetic conductive plate 553 for connecting the side magnetic circuit and the intermediate magnetic circuit 552, wherein the intermediate magnetic circuit 552 is an annular magnet, which is arranged around the periphery of the central magnetic circuit, and the side magnetic circuit is arranged around the periphery of the intermediate magnetic circuit 552. The first magnetic conductive plate 551 includes a top 5514 connected to the central magnetic circuit, a bottom 5516 connected to the intermediate magnetic circuit, and a connecting portion 5515 for connecting the top 5514 and the bottom 5516, wherein the connecting portion 5515 is not coplanar with the top 5514 and the bottom 5516, a first through hole 5511 is opened at the top 5514, the central magnetic circuit is connected to the top 5514, and the central magnetic circuit is spaced from the connecting portion 5515 and the bottom 5516, so that an air flow channel is formed between the central magnetic circuit and the first magnetic conductive plate 551. In this way, the airflow channel 5513 surrounds the central magnetic circuit, and the two sides of the airflow channel 5513 are directly connected to the second magnetic gap 20 and the first through hole 5511, which is conducive to the smooth flow of air under the second diaphragm 2, thereby improving the high-frequency performance of the second diaphragm 2, and further improving the high-frequency performance after the first diaphragm 1 and the second diaphragm 2 are superimposed.

[0052] A step structure is formed between the top portion 5514 , the connecting portion 5515 and the bottom portion 5516 , and the step structure provides an escape space for the first diaphragm 1 , thereby improving the performance of the sound unit.

[0053] One side of the top 5514 is connected to the inner edge of the first fold ring 11 , and the other side of the top 5514 is connected to the central magnetic circuit. One end of the middle magnetic circuit 552 is connected to the bottom 5516 , and the other end of the middle magnetic circuit 552 is connected to the second magnetic conductive plate 553 .

[0054] Preferably, the number of the first through holes 5511 is at least two, and the first through holes 5511 are arranged through and at intervals on the top 5514. In specific applications, different numbers of first through holes are set as needed, which is not specifically limited here. A second through hole is arranged on the first fold ring 11, and the second through hole is a through hole. The first through hole 5511 is connected to the second through hole, and is used for the sound waves of the second diaphragm to radiate outward.

[0055] Furthermore, a dustproof net 5512 is provided on the second through hole, and the dustproof net 5512 is used to prevent external dust or impurities from entering into the interior of the sound-emitting unit, so as to avoid affecting the acoustic performance of the sound-emitting unit.

[0056] Preferably, the two sides of the air flow channel 5513 are respectively connected to the second magnetic gap 30 and the first through hole 5511, that is, the air flow channel 5513 surrounds the central magnetic circuit and is directly connected to the second magnetic gap 20, which is conducive to the smooth flow of air under the second diaphragm 2, thereby improving the high-frequency performance of the second diaphragm 2, and further improving the high-frequency performance after the first diaphragm 1 and the second diaphragm 2 are superimposed.

[0057] like Figure 1 , Figure 2 and Figure 3 As shown, the first magnetic conductive plate 551, the intermediate magnetic circuit 552 and the second magnetic conductive plate 553 are of separate design, the first magnetic conductive plate 551 includes a top 5514, a connecting portion 5515 and a bottom 5516 as an integrally formed structure, a step structure is formed between the top 5514, the connecting portion 5515 and the bottom 5516, the top of the center magnet 521 is fixed on the top 5514, the first magnetic conductive plate 551, the intermediate magnetic circuit 552 and the second magnetic conductive plate 553 are connected and arranged in sequence, the intermediate magnetic circuit 552 is arranged in the middle part of the central magnetic circuit and the side magnetic circuit, the first magnetic conductive plate 551 and the second magnetic conductive plate 553 are made of magnetic conductive material, and the intermediate magnetic circuit 552 is a permanent magnet, thereby further improving the magnetic field strength in the first magnetic gap 10 and the second magnetic gap 20, so that the magnetic field performance of the magnetic circuit system 5 can be further improved.

[0058] Preferably, an avoidance groove 5531 is provided on the second magnetic conductive plate 553 , and the avoidance groove 5531 provides an avoidance space for the first voice coil 3 , thereby improving the performance of the sound unit.

[0059] More specifically, the central magnetic circuit has a central portion connected to the top 5514 and a peripheral portion located outside the central portion, the central portion is spaced apart from the connecting portion 5515, and the top surface of the peripheral portion is lower than the bottom surface of the bottom 5516. In this way, the peripheral portion can be further approached to the second magnetic conductive plate 553, reducing the distance between the peripheral portion and the second magnetic conductive plate 553, thereby increasing the magnetic flux passing through the second voice coil 4 and improving the vibration performance of the second voice coil 4.

[0060] In the above embodiment, preferably, the area of ​​the first through hole 5511 accounts for 40%-85% of the area of ​​the top 5514, and specifically can be 40%, 50%, 60%, 70%, 80%, 85%, etc. If the area of ​​the first through hole 5511 is too small, it is not conducive to the radiation of the sound waves of the second diaphragm 2 to the outside world. If the area of ​​the first through hole 5511 is too large, the bonding area between the central magnetic circuit and the top 5514 is too small, which is not conducive to improving the connection reliability between the two. In the embodiment of the present invention, a first cavity is formed between the first diaphragm 1, the bracket 6, the first magnetic plate 551, the intermediate magnetic circuit 552 and the second magnetic plate 553. The first cavity is a closed cavity, and a first leakage hole 63 connecting the first cavity and the outside is provided on the sound-emitting monomer. The first leakage hole 63 can balance the air pressure of the first cavity and improve the vibration balance of the first diaphragm 1. Preferably, there are multiple first leakage holes 63, and the multiple first leakage holes 63 are symmetrically arranged along the circumference of the sound-emitting monomer. Preferably, a damping element is provided on the first leakage hole 63, which can further adjust the air flow velocity of the first cavity and adjust the acoustic resistance of the first cavity.

[0061] Optionally, the central magnetic circuit includes a central magnetic conductive plate 53 and a central magnetic group 52 disposed on the central magnetic conductive plate 53, the middle magnetic circuit includes a middle magnet, the side magnetic circuit includes a side magnet 51 and a side magnetic conductive plate 51, a second magnetic gap 20 is formed between the central magnetic conductive plate 53 and the second magnetic conductive plate 553, and a first magnetic gap 10 is formed between the side magnetic conductive plate 51 and the middle magnetic circuit 552. Specifically, the first magnetic gap 10 is formed between the side magnetic conductive plate 51 and the bottom 5516.

[0062] In the embodiment of the present invention, the central magnetic group 52 has two different structures, such as Figure 1 and Figure 2As shown, the central magnetic group 52 includes a first central magnet 521 and a first central annular magnet 522 surrounding the central magnet; wherein the top of the first central magnet 521 is connected to the top 5514, the bottom of the first central magnet 521 is connected to the central magnetic conductive plate 53, the bottom of the central annular magnet 522 is connected to the central magnetic conductive plate 53, and the height of the central annular magnet 522 is lower than the height of the first central magnet 521. The magnetizing direction of the central magnetic group 52 is parallel to the vibration direction of the vibration system, and the magnetizing directions of the first central magnet 521 and the central annular magnet 522 are the same. At this time, the first central magnet 521 forms the central part of the central magnetic group 52, and the central annular magnet 522 forms the peripheral part of the central magnetic group 52, that is, the top surface of the central annular magnet 522 is lower than the bottom surface of the bottom 5516.

[0063] like Figure 3 As shown, the central magnetic group 52 includes a first central magnet 521 disposed on the central magnetic plate 53 and a second central magnet 523 disposed on the first central magnet 521; wherein the top of the second central magnet 523 is connected to the top plate 551, the first central magnet 521 is aligned with the central magnetic plate 53, and the width of the first central magnet 521 is greater than the width of the second central magnet 523. At this time, the portion of the first central magnet 521 wider than the second central magnet 523 forms the outer peripheral portion of the central magnetic group 52, and the portion of the first central magnet 521 connected to the second central magnet 523 and the second central magnet 523 form the central portion of the central magnetic group 52, that is, the top surface of the portion of the first central magnet 521 wider than the second central magnet 523 is lower than the bottom surface of the bottom 5516. Of course, in other embodiments, the central magnetic group 52 can also be an integrally formed magnet, which is not limited in this application. In an application, a suitable specific structural design of the central magnetic group 52 is selected according to actual needs.

[0064] The edge magnetic conductive plate 51 is injection molded on the bracket 6, and the first leakage hole 63 is formed by removing material from the edge magnetic conductive plate 51 and the corresponding bracket area. In the embodiment of the present invention, the first leakage hole 63 is formed by removing material from the edge magnetic conductive plate 51 and the bracket, so that the first leakage hole 63 does not occupy the radial size of the sound-emitting unit additionally, so as to maximize the radial size of the sound-emitting unit, or the size of the leakage hole can be increased under the limited size of the sound-emitting unit to balance the internal pressure.

[0065] Among them, the second diaphragm 2 includes a third fold ring 21 and a reinforcement part 22, and the third fold ring 21 is arranged around the reinforcement part 22. The sound unit also includes a back cover 8, which is located on the side of the second diaphragm 2 away from the first diaphragm 1. A second cavity is formed between the second diaphragm 2 and the back cover 8, and a second leakage hole 81 connecting the second cavity and the outside is provided on the back cover 8. The second leakage hole 81 can balance the air pressure in the second cavity and improve the vibration balance of the second diaphragm 2. Among them, the back cover is made of metal, which is convenient for strongly supporting the sound unit during the assembly process of the sound unit and also reduces the size of the whole machine. In specific applications, a suitable number of leakage holes is set according to actual conditions, and is not limited to a fixed number. Preferably, a damping member is provided on the second leakage hole 81, which can further adjust the air flow rate of the second cavity and adjust the sound resistance of the second cavity.

[0066] In addition, in the embodiment of the present invention, a first positioning ring 71 is provided between the outer edge of the second fold ring 12 and the first bracket 61, and a second positioning ring 72 is provided between the third fold ring 22 and the second bracket 62. Specifically, the positioning ring may be a steel ring, and the positioning ring is used between the fold ring and the bracket so that the first diaphragm 1 or the second diaphragm 2 is easy to take during the assembly process, and at the same time, the assembly accuracy is improved, and the performance of the sound unit is improved.

[0067] The present invention also provides an electronic device, comprising a housing having a receiving cavity and a sound-emitting unit disposed in the receiving cavity, wherein the structure of the sound-emitting unit is as described above. The sound-emitting unit divides the receiving cavity into a front cavity and a rear cavity isolated from each other, and the housing is provided with a sound outlet hole connected to the front cavity, and the sound waves of the first diaphragm and the second diaphragm of the sound-emitting unit are radiated to the outside through the sound outlet hole. Optionally, a third leakage hole is also provided on the housing, and the third leakage hole is connected to the rear cavity.

[0068] Specifically, the housing includes an upper housing 91 and a lower housing 92. Figure 4 In the illustrated embodiment, a sound outlet hole 911 connected to the front cavity is provided on the upper shell 91 of the housing, and the sound waves of the first diaphragm 1 and the second diaphragm 2 are radiated to the outside through the sound outlet hole 911. A third leakage hole 921 is provided on the lower shell 92 of the housing, and the third leakage hole 921 is connected to the rear cavity, and is used to adjust the pressure in the rear cavity, and further adjust the air pressure of the first cavity and the second cavity. Optionally, a damping member for adjusting the acoustic resistance is provided on the third leakage hole 921.

[0069] In the embodiment of the present invention, the shape of the housing of the electronic device may be a square structure. In specific applications, other suitable shapes such as a circle may be selected according to actual conditions, and the shape is not limited to a specific one.

[0070] Among them, the specific structure of the sound unit refers to the above embodiments. Since the electronic device adopts all the technical solutions of all the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0071] As described above, the sound unit and the electronic device proposed in accordance with the present invention are described by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can be made to the sound unit and the electronic device proposed in accordance with the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A sound-emitting unit, characterized in that: including a bracket; and, A magnetic circuit system connected to the bracket, comprising a central magnetic circuit, an intermediate magnetic circuit, a side magnetic circuit, a first magnetic conductive plate for connecting the central magnetic circuit and the intermediate magnetic circuit, and a second magnetic conductive plate for connecting the side magnetic circuit and the intermediate magnetic circuit, wherein the side magnetic circuit is arranged around the intermediate magnetic circuit to form a first magnetic gap, the intermediate magnetic circuit is arranged around the central magnetic circuit to form a second magnetic gap, a first through hole is arranged on the first magnetic conductive plate, an air flow channel is formed between the central magnetic circuit and the first magnetic conductive plate, the air flow channel is located outside the central magnetic circuit and the two sides are connected to the second magnetic gap and the first through hole respectively; The vibration system comprises a first diaphragm and a second diaphragm connected to both sides of the bracket, a first voice coil connected to the first diaphragm, and a second voice coil connected to the second diaphragm, wherein the first voice coil is located in the first magnetic gap, and the second voice coil is located in the second magnetic gap; wherein, The first diaphragm includes a first fold ring, a second fold ring located outside the first fold ring, and a vibrating portion located between the first fold ring and the second fold ring, the vibrating portion is connected to the first voice coil, the first fold ring is connected to the first magnetic conductive plate and has a second through hole connected to the first through hole, the sound waves of the second diaphragm are radiated outward through the first through hole and the second through hole, and the sound waves of the first diaphragm and the second diaphragm are radiated outward on the same side of the sound-emitting unit.

2. The sound-emitting unit according to claim 1, characterized in that: The first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves with the same phase outward.

3. The sound-emitting unit according to claim 1, characterized in that: The first magnetic conductive plate includes a top connected to the central magnetic circuit, a bottom connected to the intermediate magnetic circuit, and a connecting portion for connecting the top and the bottom, wherein the connecting portion is not coplanar with the top and the bottom, the first through hole is opened at the top, the central magnetic circuit is connected to the top, and the central magnetic circuit is spaced apart from the connecting portion and the bottom, so that the airflow channel is formed between the central magnetic circuit and the first magnetic conductive plate.

4. The sound-emitting unit according to claim 3, characterized in that: The central magnetic circuit has a central portion connected to the top and a peripheral portion located outside the central portion, the central portion is spaced apart from the connecting portion, and the top surface of the peripheral portion is lower than the bottom surface of the bottom; and / or, The number of the first through holes is at least two, and the first through holes penetrate through and are spaced apart on the top.

5. The sound-emitting unit according to claim 1, characterized in that: An escape groove is arranged on the second magnetic conductive plate, and the escape groove provides an escape space for the first voice coil.

6. The sound-emitting unit according to claim 1, characterized in that: The central magnetic circuit includes a central magnetic conductive plate and a central magnetic group arranged on the central magnetic conductive plate, the middle magnetic circuit includes a middle magnet, and the side magnetic circuit includes a side magnetic conductive plate and a side magnet, wherein: The central magnetic group, the middle magnet and the side magnets are all magnetized along the vibration direction of the vibration system, and the magnetization directions of the central magnetic group and the middle magnet are opposite, and the magnetization directions of the middle magnet and the side magnets are opposite.

7. The sound-emitting unit according to claim 6, characterized in that: The central magnetic group includes a first central magnet and a central annular magnet surrounding the first central magnet, the top end of the first central magnet is connected to the top, the bottom end of the first central magnet is connected to the central magnetic conductive plate, and the height of the first central annular magnet is lower than the height of the central magnet; or, The central magnetic group includes a first central magnet arranged on the central magnetic conductive plate and a second central magnet arranged on the first central magnet, the top of the second central magnet is connected to the top plate, and the width of the first central magnet is greater than the width of the second central magnet.

8. The sound-emitting unit according to claim 6, characterized in that: A first cavity is formed between the first diaphragm, the bracket, the first magnetic conductive plate, the intermediate magnetic circuit and the second magnetic conductive plate. The first cavity is a closed cavity. A first leakage hole connecting the first cavity with the outside is provided on the sound-emitting unit; wherein, The edge magnetic conductive plate is injection molded on the bracket, and the first leakage hole is formed by removing material from the edge magnetic conductive plate and the corresponding bracket area.

9. The sound-emitting unit according to claim 1, characterized in that: The second diaphragm includes a third fold ring and a reinforcement portion. The third fold ring is arranged around the reinforcement portion, and the outer edge of the third fold ring is connected to the bracket.

10. The sound-emitting unit according to claim 9, characterized in that: The sound-emitting unit further includes a back cover, the back cover is located on a side of the second diaphragm away from the first diaphragm, a second cavity is formed between the second diaphragm and the back cover, and a second leakage hole connecting the second cavity and the outside is arranged on the back cover; and / or, The sound-emitting unit further includes two positioning rings, which are respectively arranged between the outer edge of the second folding ring and the bracket and between the outer edge of the third folding ring and the bracket.

11. An electronic device, comprising a housing having a receiving cavity and a sound-emitting unit arranged in the receiving cavity, characterized in that: The sound-generating monomer is a sound-generating monomer as described in any one of claims 1 to 10, wherein: The sound-emitting unit divides the receiving cavity into a front cavity and a rear cavity isolated from each other. The shell is provided with a sound outlet hole connected with the front cavity. The sound waves of the first diaphragm and the second diaphragm of the sound-emitting unit are radiated to the outside through the sound outlet hole.

12. The electronic device according to claim 11, characterized in that: A third leakage hole is also provided on the shell, and the third leakage hole is communicated with the rear cavity.

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