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, an edge magnetic circuit and a magnetic conductive yoke, a first magnetic gap and a second magnetic gap are respectively formed among the edge magnetic circuit, the central magnetic circuit and the magnetic conductive yoke, a first through hole is formed in the magnetic conductive yoke, and an airflow channel communicated with the first through hole is formed between the central magnetic circuit and the magnetic conductive yoke; the vibration system comprises a first vibrating diaphragm and a second vibrating diaphragm; the first vibrating diaphragm comprises a first folding ring, a second folding ring and a vibrating part, the vibrating part is connected to the first voice coil, the first folding ring is connected to the magnetic conductive yoke and is provided with a second through hole communicated with the first through hole, and sound waves of the second vibrating diaphragm radiate outwards through the first through hole and the second through hole; and sound waves of the first vibrating diaphragm and the second vibrating diaphragm are radiated outwards on the same side of the sound production monomer. 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 is connected to the bracket, comprising a central magnetic circuit, a side magnetic circuit arranged around the central magnetic circuit, and a magnetic yoke used to connect the central magnetic circuit and the side magnetic circuit, wherein a first magnetic gap is formed between the side magnetic circuit and the magnetic yoke, a second magnetic gap is formed between the central magnetic circuit and the magnetic yoke, a first through hole is arranged on the magnetic yoke, an airflow channel is formed between the central magnetic circuit and the magnetic yoke, the airflow channel is located outside the central magnetic circuit, and the second magnetic gap and the first through hole are connected on both sides thereof;

[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 arranged outside the first fold ring, and a vibration part arranged between the first fold ring and the second fold ring, the first voice coil is connected to the vibration part, the first fold ring is connected to the magnetic yoke 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 magnetic yoke includes a top plate, a bottom plate and a side plate for connecting the top plate and the bottom plate, wherein the central magnetic circuit is arranged on the top plate, the side magnetic circuit is arranged on the bottom plate, the first through hole is arranged on the top plate, and the first fold ring is connected to the top plate.

[0011] Preferably, the top plate includes a first fixing plate connected to the central magnetic circuit, a second fixing plate connected to the connecting portion, and a connecting plate for connecting the first fixing plate and the second fixing plate, wherein:

[0012] The first fixing plate and the second fixing plate are located in different planes, the first through hole is opened in the first fixing plate, and the central magnetic circuit is connected to the first fixing plate.

[0013] Preferably, a relief groove is provided on the bottom plate, wherein the relief groove provides a relief space for the first voice coil; or,

[0014] The central magnetic circuit has a central part connected to the first fixed plate and a peripheral part located outside the central part, and the top surface of the peripheral part is lower than the top surface of the central part and the bottom surface of the second fixed plate, so that the airflow channel is formed between the central magnetic circuit and the magnetic yoke.

[0015] Preferably, the airflow channel surrounds the central magnetic circuit and communicates with the second magnetic gap and extends to the first through hole, wherein:

[0016] The number of the first through holes is at least two and they are arranged at intervals.

[0017] Preferably, the central magnetic circuit includes a central magnetic conductive plate and a central magnetic group arranged on the central magnetic conductive plate, the side magnetic circuit includes a side magnet and a side magnetic conductive plate, a second magnetic gap is formed between the central magnetic conductive plate and the bottom plate, and a first magnetic gap is formed between the side magnetic conductive plate and the top plate.

[0018] Preferably, the central magnetic group includes a first central magnet and a central annular magnet surrounding the first central magnet, the top of the first central magnet is connected to the top plate, the bottom of the first central magnet is connected to the central magnetic conductive plate, and the height of the central annular magnet is lower than the height of the first central magnet; or,

[0019] 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. The width of the first central magnet is greater than that of the second central magnet.

[0020] Preferably, the first fold ring is annular, and the inner edge of the first fold ring forms a second through hole, wherein:

[0021] The second through hole is covered with a dustproof net, which is used to prevent external impurities from entering the interior of the sound-emitting unit; and / or,

[0022] 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.

[0023] Preferably, a first cavity is formed between the first diaphragm, the bracket and the magnetic yoke, the first cavity is a closed cavity, a first leakage hole connecting the first cavity with the outside is arranged on the sound unit, and a damping member is arranged on the first leakage hole.

[0024] Preferably, the sound unit further 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; and / or,

[0025] The sound unit also includes a back cover, which 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.

[0026] 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:

[0027] 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 in the shell. 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.

[0028] Preferably, a third leakage hole is provided on the shell, and the third leakage hole is communicated with the rear cavity.

[0029] It can be seen from the above technical scheme that the sound-emitting unit and electronic device provided by the present invention drive two diaphragms with two voice coils to vibrate and produce sound through a 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 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 connecting piece, 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.

[0030] 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

[0031] 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:

[0032] 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;

[0033] Figure 2 is a cross-sectional view of a sound-emitting unit according to Embodiment 1 of the present invention;

[0034] Figure 3 is a cross-sectional view of a sound-emitting unit according to the second embodiment of the present invention;

[0035] Figure 4 is a schematic diagram of a three-dimensional structure of an electronic device according to an embodiment of the present invention;

[0036] Figure 5 It is a schematic diagram of the three-dimensional structure of the sound unit according to an embodiment of the present invention.

[0037] The reference numerals include: 1, first diaphragm, 11, first fold ring, 12, second fold ring, 13, vibration part,

[0038] 2. Second diaphragm, 21. Third fold ring, 22. Reinforcement part,

[0039] 3. First voice coil, 4. Second voice coil,

[0040] 5. Magnetic circuit system, 51. Side magnetic plate, 52. Center magnetic group, 521. First center magnet, 522. Center annular magnet, 523. Second center magnet, 53. Center magnetic plate, 54. Side magnet, 55. Magnetic yoke, 551. Top plate, 552. Side plate, 553. Bottom plate, 55511. First through hole, 5512. Dust screen, 5513. Air flow channel, 5514. First fixing plate, 5515. Connecting plate, 5516. Second fixing plate, 5531. Groove;

[0041] 6. bracket, 61. first bracket, 62. second bracket, 63. first leakage hole, 64. damping element;

[0042] 71, a first positioning ring, 72, a second positioning ring;

[0043] 8. Back cover, 81. Second leakage hole,

[0044] 91, upper shell, 92, lower shell, 911, sound outlet hole, 921, third leakage hole;

[0045] 10. First magnetic gap, 20. Second magnetic gap.

[0046] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] In order to illustrate the structure of the sound-generating unit provided by the present invention, Figures 1 to 3 , 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 structures of the sound-emitting monomers of the embodiments of the present invention are respectively shown.

[0052] like Figures 1 to 3 , Figure 5 As shown together, the sound-emitting unit provided by the present invention includes a bracket, a magnetic circuit system 5 and a vibration system. The magnetic circuit system 5 is connected to the bracket, and includes a central magnetic circuit, a side magnetic circuit arranged around the central magnetic circuit, and a magnetic yoke 55 for connecting the central magnetic circuit and the side magnetic circuit, wherein a first magnetic gap 10 is formed between the side magnetic circuit and the magnetic yoke 55, a second magnetic gap 20 is formed between the central magnetic circuit and the magnetic yoke 55, a first through hole 5511 is provided on the magnetic yoke 55, an air flow channel 5513 connected to the first through hole 5511 is formed between the central magnetic circuit and the magnetic yoke 55, the air flow channel 5513 is located on the outside of the central magnetic circuit and the two sides are connected to the second magnetic gap 20 and the first through hole 5511 respectively; the vibration system is connected to the bracket 6, and includes two sides of the bracket. A first diaphragm 1 and a second diaphragm 2 are connected, a first voice coil 3 is connected to the first diaphragm 1, and a second voice coil 4 is 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. 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 magnetic yoke 55 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 outward 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 outward on the same side of the sound-emitting unit.

[0053] 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 magnetic yoke 55, 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.

[0054] 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.

[0055] Optionally, the bracket 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.

[0056] In an embodiment of the present invention, the magnetic circuit system 5 includes a magnetic yoke 55, a central magnetic circuit and a side magnetic circuit arranged on the magnetic yoke 55, wherein the magnetic yoke 55 includes a top plate 551, a bottom plate 553 and a side plate 552 for connecting the top plate 551 and the bottom plate 553, wherein the central magnetic circuit is arranged on the top plate 551, the side magnetic circuit is arranged on the bottom plate 553, the first through hole 5511 is arranged on the top plate 551, and the first fold ring 11 is connected to the top plate 551.

[0057] The number of the first through holes 5511 is at least 2. In a specific application, different numbers of first through holes are set as needed, and each first through hole is arranged at intervals. A second through hole is arranged on the first fold ring 11. The second through hole is a through hole. The first fold ring is annular. The inner edge of the first fold ring forms the second through hole. The first through hole is connected to the second through hole, and is used for the sound waves of the second diaphragm to radiate outward.

[0058] 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.

[0059] Among them, the two sides of the air flow channel 5513 are respectively connected to the second magnetic gap 20 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.

[0060] The top plate 551, bottom plate 553 and side plate 552 of the magnetic yoke 55 are all made of magnetic conductive materials, that is, the magnetic yoke 55 is a magnetic conductive component, which is an integrated design structure and is easy to process and manufacture. Figure 1 , Figure 2 and Figure 3 In the illustrated embodiment, the magnetic yoke 55 is an integrated design structure, and the top plate 551 is connected to the inner edge of the first fold ring 11; the top plate is integrally formed with a first fixing plate 5514, a connecting plate 5515 and a second fixing plate 5516, wherein the second fixing plate 5516 is connected to the side plate 552, which is beneficial to simplify the number of components and improve the positioning accuracy during the assembly process.

[0061] In the above embodiments, the top plate 551 includes a first fixing plate 5514, a second fixing plate 5516 and a connecting plate 5515 connecting the two, the first fixing plate 5514 and the second fixing plate 5516 are located on different planes, the first through hole is provided on the first fixing plate 5514, the top end of the central magnetic circuit is fixed on the first fixing plate 5514, the central magnetic circuit is spaced from the connecting plate 5515 and the second fixing plate 5516, so that an airflow channel 5513 is formed between the central magnetic circuit and the magnetic yoke 55. In this way, the airflow channel 5513 surrounds the central magnetic circuit, and both 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 below the second diaphragm 2, improves the high-frequency performance of the second diaphragm 2, and further improves the high-frequency performance after the first diaphragm 1 and the second diaphragm 2 are superimposed.

[0062] The first fixing plate 5514 and the second fixing plate 5516 are located on different planes, and a step structure is formed therebetween, and the step structure provides an escape space for the first diaphragm 1 .

[0063] Optionally, an avoidance groove 5531 is provided on the bottom 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.

[0064] More specifically, the central magnetic circuit has a central portion connected to the first fixing plate 5514 and a peripheral portion located outside the central portion, the central portion is spaced apart from the connecting plate 5515, and the top surface of the peripheral portion is lower than the bottom surface of the second fixing plate 5516. In this way, the peripheral portion can be further approached to the bottom plate 553, reducing the distance between the peripheral portion and the bottom plate 553, increasing the magnetic flux passing through the second voice coil 4, and improving the vibration performance of the second voice coil 4.

[0065] In the above embodiment, preferably, the area of ​​the first through hole 5511 accounts for 40%-85% of the area of ​​the first fixing plate 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 sound wave of the second diaphragm 2 to radiate 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 first fixing plate 5514 is too small, which is not conducive to improving the connection reliability between the two.

[0066] In the embodiment of the present invention, a first cavity is formed between the first diaphragm 1, the bracket 6, and the magnetic yoke 55. 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 unit. The first leakage hole 63 can balance the air pressure in 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 unit. Preferably, a damping member is provided on the first leakage hole 63, which can further adjust the airflow velocity of the first cavity and adjust the acoustic resistance of the first cavity.

[0067] 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 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 bottom plate 553, and a first magnetic gap 10 is formed between the side magnetic conductive plate 51 and the top plate 551. Specifically, the first magnetic gap 10 is formed between the side magnetic conductive plate 51 and the second fixed plate 5516.

[0068] In the embodiment of the present invention, the central magnetic group 52 has two different structures, such as Figure 1 and Figure 2 As shown, the central magnetic group 52 includes a first central magnet 521 and a central annular magnet 522 surrounding the central magnet; wherein the top of the central magnet 521 is connected to the top plate 551, 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 second fixed plate 5516.

[0069] like Figure 3As 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 second fixed plate 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 specific applications, the specific structural design of the appropriate central magnetic group 52 is selected according to actual needs.

[0070] 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, or the size of the leakage hole can be increased under the limited size of the sound-emitting unit to balance the internal pressure.

[0071] Wherein, 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, and 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. Wherein, 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 acoustic resistance of the second cavity.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] As described above, the sound unit and the electronic device proposed according to 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 by 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, a side magnetic circuit arranged around the central magnetic circuit, and a magnetic yoke for connecting the central magnetic circuit and the side magnetic circuit, wherein a first magnetic gap is formed between the side magnetic circuit and the magnetic yoke, a second magnetic gap is formed between the central magnetic circuit and the magnetic yoke, a first through hole is arranged on the magnetic yoke, an air flow channel is formed between the central magnetic circuit and the magnetic yoke, the air flow channel is located outside the central magnetic circuit and the two sides of the air flow channel are respectively connected to the second magnetic gap and the first through hole; 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 arranged on the outside of the first fold ring, and a vibration part arranged between the first fold ring and the second fold ring, the first voice coil is connected to the vibration part, the first fold ring is connected to the magnetic yoke 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 magnetic yoke includes a top plate, a bottom plate and a side plate for connecting the top plate and the bottom plate, wherein the central magnetic circuit is arranged on the top plate, the side magnetic circuit is arranged on the bottom plate, the first through hole is arranged on the top plate, and the first fold ring is connected to the top plate.

4. The sound-emitting unit according to claim 3, characterized in that: The top plate includes a first fixing plate connected to the central magnetic circuit, a second fixing plate connected to the connecting portion, and a connecting plate for connecting the first fixing plate and the second fixing plate, wherein: The first fixing plate and the second fixing plate are located in different planes, the first through hole is opened in the first fixing plate, and the central magnetic circuit is connected to the first fixing plate.

5. The sound-emitting unit according to claim 4, characterized in that: An escape groove is provided on the bottom plate, wherein the escape groove provides an escape space for the first voice coil; or, The central magnetic circuit has a central part connected to the first fixed plate and a peripheral part located outside the central part, and the top surface of the peripheral part is lower than the top surface of the central part and the bottom surface of the second fixed plate, so that the airflow channel is formed between the central magnetic circuit and the magnetic yoke.

6. The sound-emitting unit according to claim 1, characterized in that: The airflow channel surrounds the central magnetic circuit and communicates with the second magnetic gap and extends to the first through hole, wherein: The number of the first through holes is at least two and they are arranged at intervals.

7. The sound-emitting unit according to claim 3, 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 side magnetic circuit includes a side magnet and a side magnetic conductive plate, the second magnetic gap is formed between the central magnetic conductive plate and the bottom plate, and the first magnetic gap is formed between the side magnetic conductive plate and the top plate.

8. The sound-emitting unit according to claim 7, characterized in that: The central magnetic group includes a first central magnet and a central annular magnet surrounding the first central magnet, the top of the first central magnet is connected to the top plate, the bottom of the first central magnet is connected to the central magnetic conductive plate, and the height of the central annular magnet is lower than the height of the first 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.

9. The sound-emitting unit according to claim 1, characterized in that: The first fold ring is annular, and the inner edge of the first fold ring forms the second through hole, wherein: The second through hole is covered with a dustproof net, and the dustproof net is used to prevent external impurities from entering the interior of the sound-emitting unit; and / or, 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 1, characterized in that: A first cavity is formed between the first diaphragm, the bracket and the magnetic yoke, and the first cavity is a closed cavity. A first leakage hole connecting the first cavity and the outside is arranged on the sound unit, and a damping member is arranged on the first leakage hole.

11. The sound-emitting unit according to claim 1, characterized in that: The sound-emitting unit further 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; and / or, The sound unit also includes a back cover, which 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.

12. 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 claimed in any one of claims 1 to 11, 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.

13. The electronic device according to claim 12, 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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