Sound generator and electronic equipment

Abstract

This invention provides a sound-generating unit and an electronic device. The sound-generating unit includes a support, a magnetic circuit system, and a vibration system. The magnetic circuit system includes a central magnetic circuit, a side magnetic circuit, and a magnetic yoke. A first magnetic gap and a second magnetic gap are formed between the side magnetic circuit, the central magnetic circuit, and the magnetic yoke, respectively. A first through-hole is provided on the magnetic yoke, and an airflow channel communicating with the first through-hole is formed between the central magnetic circuit and the magnetic yoke. The vibration system includes a first diaphragm and a second diaphragm. The first diaphragm includes a first folded ring, a second folded ring, and a vibrating part. The vibrating part is connected to a first voice coil. The first folded ring is connected to the magnetic yoke and has a second through-hole communicating with the first through-hole. The sound waves of the second diaphragm radiate outward through the first and second through-holes, and the sound waves of the first and second diaphragms radiate outward on the same side of the sound-generating unit. This invention solves the problem that the vibration area and vibration displacement of existing sound-generating units cannot meet the requirements of wearable audio products such as OWS headphones.

Description

Technical Field

[0001] This invention relates to the field of sound generation technology, and more specifically, to a sound-generating unit and electronic device. Background Technology

[0002] In recent years, with the development of smart wearable electronic products, the requirements for the performance of individual units in smart wearable products have become increasingly higher. In particular, the requirements for OWS (Open Wearable Stereo) Bluetooth headphones are different from those for TWS (True Wireless Stereo). Because the whole device is designed to be convenient and comfortable to wear, it adopts an in-ear design, making it imperative to improve the performance of the sound-producing unit.

[0003] Traditional driver designs all involve single-sided vibration to produce sound. Within the limited internal space of the device, it is difficult to increase the vibration area and vibration displacement. Therefore, the performance improvement of the sound-producing unit is also relatively limited, 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 this invention is to provide a sound-generating unit and electronic device to solve the problem that the vibration area and vibration displacement of existing sound-generating units cannot meet the needs of wearable audio products such as OWS headphones.

[0005] This invention provides a sound-generating unit, comprising: a support; and,

[0006] A magnetic circuit system, connected to a support, includes a central magnetic circuit, side magnetic circuits surrounding the central magnetic circuit, and a magnetically conductive yoke for connecting the central magnetic circuit and the side magnetic circuits. A first magnetic gap is formed between the side magnetic circuits and the magnetically conductive yoke, and a second magnetic gap is formed between the central magnetic circuit and the magnetically conductive yoke. A first through hole is provided on the magnetically conductive yoke, and an airflow channel is formed between the central magnetic circuit and the magnetically conductive yoke. The airflow channel is located outside the central magnetic circuit and its two sides are respectively connected to the second magnetic gap and the first through hole.

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

[0008] The first diaphragm includes a first folded ring, a second folded ring disposed outside the first folded ring, and a vibrating part disposed between the first folded ring and the second folded ring. A first voice coil is connected to the vibrating part. The first folded ring is connected to the magnetic yoke and has a second through hole communicating with the first through hole. The sound waves of the second diaphragm radiate outward through the first through hole and the second through hole, and the sound waves of the first diaphragm and the second diaphragm radiate outward on the same side of the sound-generating unit.

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

[0010] Preferably, the magnetic yoke includes a top plate, a bottom plate, and side plates for connecting the top plate and the bottom plate, wherein a central magnetic circuit is disposed on the top plate, a side magnetic circuit is disposed on the bottom plate, a first through hole is disposed on the top plate, and a first folding 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 on 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 clearance groove is provided on the base plate, wherein the clearance groove provides clearance space for the first voice coil; or,

[0014] The central magnetic circuit has a central portion connected to the first fixed plate and an outer peripheral portion located outside the central portion. The top surface of the outer peripheral portion is lower than the top surface of the central portion 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, extending to the first through hole, wherein,

[0016] The number of first through holes is at least two, and they are spaced apart.

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

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

[0019] The central magnetic assembly includes a first central magnet disposed on a central magnetic plate and a second central magnet disposed 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.

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

[0021] A dustproof mesh is provided covering the second through hole to prevent external impurities from entering the interior of the sound-generating unit; and / or,

[0022] The second diaphragm includes a third fold and a reinforcing portion. The third fold surrounds the reinforcing portion, and the outer edge of the third fold is connected to the support.

[0023] Preferably, a first cavity is formed between the first diaphragm, the support, and the magnetic yoke. The first cavity is a sealed cavity. A first leakage hole is provided on the sound-generating unit to connect the first cavity with the outside. A damping element is provided on the first leakage hole.

[0024] Preferably, the sound-generating unit further includes two positioning rings, which are respectively disposed between the outer edge of the second folded ring and the bracket, and between the outer edge of the third folded ring and the bracket; and / or,

[0025] The sound-generating 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 is provided on the back cover to connect the second cavity with the outside.

[0026] The present invention also provides an electronic device, comprising a housing having a receiving cavity and a sound-emitting unit disposed within the receiving cavity, wherein the sound-emitting unit is the aforementioned sound-emitting unit, wherein...

[0027] The sound-generating unit divides the housing cavity into a front cavity and a rear cavity that are isolated from each other. The housing is provided with a sound outlet that communicates with the front cavity. The sound waves of the first diaphragm and the second diaphragm of the sound-generating unit are radiated to the outside through the sound outlet.

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

[0029] As can be seen from the above technical solution, the sound-generating unit and electronic device provided by the present invention drive the two diaphragms of two voice coils to vibrate and generate sound through a magnetic circuit system. The magnetic circuit system is provided with a first through hole, and the first diaphragm is provided with a connected second through hole. 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 radiate outward from the same side of the sound-generating unit. Thus, double-sided diaphragm sound generation is achieved without increasing the external size, and the vibration area of ​​the vibration system is increased, thereby achieving the purpose of performance improvement. Furthermore, an airflow channel is formed between the central magnetic group and the connector. The two sides of the airflow 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, improving the high-frequency performance of the second diaphragm, thereby improving the high-frequency performance of the first diaphragm and the second diaphragm superimposed.

[0030] To achieve the foregoing and related objectives, one or more aspects of the invention include the features that will be described in detail below. The following description and accompanying drawings illustrate certain exemplary aspects of the invention. However, these aspects indicate only a few of the various ways in which the principles of the invention can be used. Furthermore, the invention is intended to encompass all such aspects and their equivalents. Attached Figure Description

[0031] Other objects and results of the invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings. In the drawings:

[0032] Figure 1 This is a schematic diagram of the explosive structure of the sound-generating unit according to Embodiment 1 of the present invention;

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

[0034] Figure 3 This is a cross-sectional view of the sound-emitting unit according to Embodiment 2 of the present invention;

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

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

[0037] The reference numerals in the accompanying drawings include: 1, first diaphragm; 11, first folded ring; 12, second folded ring; 13, vibrating part.

[0038] 2. Second diaphragm; 21. Third fold ring; 22. Reinforcing part.

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

[0040] 5. Magnetic circuit system; 51. Side magnetic guide plate; 52. Central magnetic group; 521. First central magnet; 522. Central annular magnet; 523. Second central magnet; 53. Central magnetic guide plate; 54. Side magnet; 55. Magnetic guide yoke; 551. Top plate; 552. Side plate; 553. Bottom plate; 55511. First through hole; 5512. Dustproof net; 5513. Airflow 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 component;

[0042] 71. First positioning ring; 72. Second positioning ring;

[0043] 8. Rear cover; 81. Second leakage hole;

[0044] 91. Upper shell; 92. Lower shell; 911. Sound outlet; 921. Third leakage hole;

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

[0046] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0047] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] In response to the aforementioned problem that the vibration area and vibration displacement of existing sound-generating units cannot meet the requirements of wearable audio products such as OWS headphones, this invention proposes a sound-generating unit and an electronic device.

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

[0051] To illustrate the structure of the sound-generating monomer provided by the present invention, Figures 1 to 3 , Figure 5 The structure of the sound-producing unit is illustrated by way of example from different perspectives. Specifically, Figure 1 The diagram shows the explosive structure of the sound-emitting unit according to Embodiment 1 of the present invention; Figure 2 The cross-sectional structure of the sound-generating unit according to Embodiment 1 of the present invention is shown; Figure 3 The cross-sectional structure of the sound-generating unit according to Embodiment 2 of the present invention is shown; Figure 5 The three-dimensional structures of the sound-generating unit according to embodiments of the present invention are shown respectively.

[0052] like Figures 1 to 3 , Figure 5 As shown in the figure, the sound-generating unit provided by the present invention includes a support, a magnetic circuit system 5, and a vibration system. The magnetic circuit system 5 is connected to the support and includes a central magnetic circuit, a side magnetic circuit arranged around the central magnetic circuit, and a magnetically conductive yoke 55 for connecting the central magnetic circuit and the side magnetic circuit. A first magnetic gap 10 is formed between the side magnetic circuit and the magnetically conductive yoke 55, and a second magnetic gap 20 is formed between the central magnetic circuit and the magnetically conductive yoke 55. A first through hole 5511 is provided on the magnetically conductive yoke 55. An airflow channel 5513 communicating with the first through hole 5511 is formed between the central magnetic circuit and the magnetically conductive yoke 55. The airflow channel 5513 is located outside the central magnetic circuit and its two sides are respectively connected to the second magnetic gap 20 and the first through hole 5511. The vibration system is connected to the support 6 and includes the vibration system connected to both sides of the support. The first diaphragm 1 and the second diaphragm 2 are connected, the first voice coil 3 is connected to the first diaphragm 1, and the 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 folded ring 11, a second folded ring 12 located outside the first folded ring 11, and a vibrating part 13 disposed between the first folded ring 11 and the second folded ring 12. The vibrating part 12 is connected to the first voice coil 3. The first folded ring 11 is connected to the magnetic yoke 55 and is provided with a second through hole communicating with the first through hole 5511. The sound waves of the second diaphragm 2 radiate 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 radiate outward on the same side of the sound-generating unit.

[0053] The sound-generating unit provided in this application drives two voice coils to vibrate two diaphragms through a magnetic circuit system 5 to generate sound. The magnetic circuit system 5 has a first through hole 5511, and the first diaphragm 1 has a connected second through hole. The first through hole 5511 and the second through hole serve as sound outlets for the sound waves radiated by the second diaphragm 2, so that the sound waves of the two diaphragms radiate outward from the same side of the sound-generating unit. This achieves the effect of double-sided diaphragm unidirectional sound generation without increasing the size of the sound-generating unit, which is beneficial to increasing the vibration area of ​​the vibration system and thus achieving the purpose of performance improvement. Furthermore, the airflow channel 5513 is located between the central magnetic circuit and the magnetic yoke 55, that is, the airflow channel surrounds the central magnetic circuit. 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 the smoother airflow under the second diaphragm 2, 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-producing unit.

[0055] Optionally, the support is cylindrical, with the outer contours of the first diaphragm 1 and the second diaphragm 2 roughly aligned, facilitating the standardized design of the speaker's shape and further simplifying assembly within the unit, thus reducing the pre-reserved structure of the entire unit. Further, the support 6 includes a cylindrical first support 61 and a cylindrical second support 62, which are fitted together to form the cylindrical support. The design of the support into a first and a second support allows for the assembly of the first diaphragm 1 via the first support 61 and the second diaphragm 2 via the second support 62, facilitating the assembly of the speaker during the assembly process. Conductive terminals can also be provided on the first and second supports respectively, allowing for convenient electrical connection of the first and second voice coils to external circuits. A first leakage hole 63 is provided between the first support 61 and the second support 62, and a damping element 64 is provided in the first leakage hole 63. This allows for further adjustment of the airflow velocity and acoustic impedance within the speaker's cavity, thereby improving the speaker's performance.

[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 disposed on the magnetic yoke 55. 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. The central magnetic circuit is disposed on the top plate 551 and the side magnetic circuit is disposed on the bottom plate 553. A first through hole 5511 is disposed through the top plate 551 and a first folding ring 11 is connected to the top plate 551.

[0057] The number of first through holes 5511 is at least two. In specific applications, different numbers of first through holes are set as needed, and the first through holes are spaced apart. A second through hole is provided on the first folded ring 11. The second through hole is a through hole. The first folded ring is annular, and the inner edge of the first folded ring surrounds the second through hole. The first through hole and the second through hole are connected to each other for the sound waves of the second diaphragm to radiate outward.

[0058] Furthermore, a dustproof mesh 5512 is provided on the second through hole. The dustproof mesh 5512 is used to prevent external dust or impurities from entering the interior of the sound-generating unit, thereby avoiding affecting the acoustic performance of the sound-generating unit.

[0059] The airflow channel 5513 is connected to the second magnetic gap 20 and the first through hole 5511 on both sides, respectively. In other words, the airflow channel 5513 is directly connected to the second magnetic gap 20 around the central magnetic circuit, which is conducive to the smooth flow of air under the second diaphragm 2, improves the high-frequency performance of the second diaphragm 2, and thus improves the high-frequency performance of the first diaphragm 1 and the second diaphragm 2 after being superimposed.

[0060] Among them, the top plate 551, bottom plate 553, and side plate 552 of the magnetic yoke 55 are all made of magnetically conductive material, meaning that the magnetic yoke 55 is a magnetically conductive component and is an integrally designed structure, which facilitates processing and manufacturing. Figure 1 , Figure 2 and Figure 3 In the embodiment shown, the magnetic yoke 55 is an integral design structure, and the top plate 551 is connected to the inner edge of the first folding ring 11. The top plate is integrally formed into 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 helps 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. A 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 apart 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 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 airflow below the second diaphragm 2, improves the high-frequency performance of the second diaphragm 2, and thus improves the high-frequency performance of the first diaphragm 1 and the second diaphragm 2 after superposition.

[0062] The first fixing plate 5514 and the second fixing plate 5516 are located on different planes and form a stepped structure between them. The stepped structure provides clearance space for the first diaphragm 1.

[0063] Optionally, a clearance groove 5531 is provided on the base plate 553, which provides clearance space for the first voice coil 3, thereby improving the performance of the sound-generating unit.

[0064] More specifically, the central magnetic circuit has a central portion connected to the first fixed plate 5514 and an outer peripheral portion located outside the central portion. The central portion is spaced apart from the connecting plate 5515, and the top surface of the outer peripheral portion is lower than the bottom surface of the second fixed plate 5516. In this way, the outer peripheral portion can move further closer to the base plate 553, reducing the distance between it and the base 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 embodiments, preferably, the area of ​​the first through hole 5511 accounts for 40%-85% of the area of ​​the first fixing plate 5514, specifically 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 sound waves from the second diaphragm 2 to the outside; 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 will be too small, which is not conducive to improving the connection reliability between the two.

[0066] In an embodiment of the present invention, a first cavity is formed between the first diaphragm 1, the support 6, and the magnetic yoke 55. The first cavity is a sealed cavity, and a first leakage hole 63 connecting the first cavity to the outside is provided on the sound-generating unit. The first leakage hole 63 can equalize 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, which are symmetrically arranged circumferentially around the sound-generating unit. Preferably, a damping element is provided on the first leakage hole 63, which can further adjust the airflow velocity in the first cavity and adjust the acoustic impedance of the first cavity.

[0067] Optionally, the central magnetic circuit includes a central magnetic guide plate 53 and a central magnetic assembly 52 disposed on the central magnetic guide plate 53, and the side magnetic circuit includes a side magnet 51 and a side magnetic guide plate 51. A second magnetic gap 20 is formed between the central magnetic guide plate 53 and the bottom plate 553, and a first magnetic gap 10 is formed between the side magnetic guide plate 51 and the top plate 551. Specifically, the first magnetic gap 10 is formed between the side magnetic guide plate 51 and the second fixed plate 5516.

[0068] In embodiments of the present invention, the central magnetic assembly 52 has two different structures, such as Figure 1 and Figure 2 As shown, the central magnetic assembly 52 includes a first central magnet 521 and a central annular magnet 522 surrounding the central magnet. 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 guide plate 53, and the bottom of the central annular magnet 522 is also connected to the central magnetic guide plate 53. The height of the central annular magnet 522 is lower than the height of the first central magnet 521. The magnetization direction of the central magnetic assembly 52 is parallel to the vibration direction of the vibration system, and the magnetization directions of the first central magnet 521 and the central annular magnet 522 are the same. In this configuration, the first central magnet 521 forms the central portion of the central magnetic assembly 52, and the central annular magnet 522 forms the outer peripheral portion of the central magnetic assembly 52, meaning that the top surface of the central annular magnet 522 is lower than the bottom surface of the second fixing plate 5516.

[0069] like Figure 3As shown, the central magnetic assembly 52 includes a first central magnet 521 disposed on a central magnetic guide 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 guide plate 53, and the width of the first central magnet 521 is greater than the width of the second central magnet 523. In this case, the portion of the first central magnet 521 wider than the second central magnet 523 forms the outer periphery of the central magnetic assembly 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 assembly 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 fixing plate 5516. Of course, in other embodiments, the central magnetic assembly 52 can also be a single integrally formed magnet, which is not limited herein. In specific applications, a suitable structural design for the central magnetic assembly 52 is selected according to actual needs.

[0070] In this embodiment, the side magnetic plate 51 is injection molded onto the bracket 6, and the first leakage hole 63 is formed by removing material from the side magnetic plate 51 and the corresponding bracket area. In this embodiment, by forming the first leakage hole 63 by removing material from the side magnetic plate 51 and the bracket, the first leakage hole 63 does not additionally occupy the radial dimension of the sound-generating unit, or the size of the leakage hole can be increased within the limited size of the sound-generating unit to balance the internal pressure.

[0071] The second diaphragm 2 includes a third folded ring 21 and a reinforcing portion 22, with the third folded ring 21 surrounding the reinforcing portion 22. The sound-generating unit also includes a rear cover 8, 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 rear cover 8. A second leakage hole 81, connecting the second cavity to the outside, is provided on the rear cover 8. The second leakage hole 81 can balance the air pressure in the second cavity, improving the vibration balance of the second diaphragm 2. The rear cover is made of metal, which facilitates strong support for the sound-generating unit during assembly while reducing its footprint. In specific applications, the number of leakage holes is set according to actual conditions and is not limited to a fixed number. Preferably, the second leakage hole 81 is provided with a damping element, which can further adjust the airflow velocity in the second cavity and adjust the acoustic impedance of the second cavity.

[0072] Furthermore, in embodiments of the present invention, a first positioning ring 71 is provided between the outer edge of the second folded ring 12 and the first bracket 61, and a second positioning ring 72 is provided between the third folded ring 22 and the second bracket 62. Specifically, the positioning ring can be a steel ring. The use of positioning rings between the folded rings and the brackets makes it easier to handle the first diaphragm 1 or the second diaphragm 2 during assembly, while also improving assembly accuracy and enhancing the performance of the sound-generating unit.

[0073] The present invention also provides an electronic device, including a housing having a receiving cavity and a sound-generating unit disposed within the receiving cavity, the structure of which is as described above. The sound-generating unit divides the receiving cavity into a mutually isolated front cavity and a rear cavity. The housing is provided with a sound outlet communicating with the front cavity, and sound waves from the first and second diaphragms of the sound-generating unit are radiated to the outside through the sound outlet. Optionally, the housing is further provided with a third leakage hole communicating with the rear cavity.

[0074] Specifically, the shell includes an upper shell 91 and a lower shell 92. Figure 4 In the illustrated embodiment, a sound outlet 911 communicating with the front cavity is provided on the upper shell 91 of the housing, through which sound waves from the first diaphragm 1 and the second diaphragm 2 radiate to the outside. A third leakage hole 921 communicating with the rear cavity is provided on the lower shell 92 of the housing, used to adjust the pressure in the rear cavity and further adjust the air pressure of the first and second cavities. Optionally, a damping element for adjusting acoustic impedance is provided on the third leakage hole 921.

[0075] In embodiments of the present invention, the housing of the electronic device can be a square structure. In specific applications, other suitable structures such as circles can be selected according to the actual situation, and it is not limited to a specific shape.

[0076] The specific structure of the sound-generating unit is as described in the above embodiments. Since the electronic device adopts all the technical solutions of all the above embodiments, it has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0077] The sound-generating unit and electronic device according to the present invention have been described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various modifications can be made to the sound-generating unit and electronic device proposed in the present invention without departing from the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the contents of the appended claims.

Claims

1. A sound-emitting monomer, characterized in that, Including stents; and, A magnetic circuit system, connected to the bracket, includes a central magnetic circuit, side magnetic circuits surrounding the central magnetic circuit, and a magnetically conductive yoke for connecting the central magnetic circuit and the side magnetic circuits. A first magnetic gap is formed between the side magnetic circuits and the magnetically conductive yoke, and a second magnetic gap is formed between the central magnetic circuit and the magnetically conductive yoke. A first through hole is provided on the magnetically conductive yoke, and an airflow channel is formed between the central magnetic circuit and the magnetically conductive yoke. The airflow channel is located outside the central magnetic circuit and its two sides are respectively connected to the second magnetic gap and the first through hole. The vibration system includes a first diaphragm and a second diaphragm connected to both sides of the support, a first voice coil connected to the first diaphragm, and a second voice coil connected to the second diaphragm. The first voice coil is located in the first magnetic gap, and the second voice coil is located in the second magnetic gap. The first diaphragm includes a first folded ring, a second folded ring disposed outside the first folded ring, and a vibrating part disposed between the first folded ring and the second folded ring. A first voice coil is connected to the vibrating part. The first folded ring is connected to the magnetic yoke and has a second through hole communicating with the first through hole. The sound waves of the second diaphragm radiate outward through the first through hole and the second through hole, and the sound waves of the first diaphragm and the second diaphragm radiate outward on the same side of the sound-generating unit. The second diaphragm includes a third fold and a reinforcing portion. The third fold is disposed around the reinforcing portion, and the outer edge of the third fold is connected to the bracket.

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

3. The sound-generating unit according to claim 1, characterized in that, The magnetic yoke includes a top plate, a bottom plate, and side plates for connecting the top plate and the bottom plate. The central magnetic circuit is disposed on the top plate, the side magnetic circuit is disposed on the bottom plate, the first through hole is disposed on the top plate, and the first folded ring is connected to the top plate.

4. The sound-generating unit according to claim 3, characterized in that, The top plate includes a first fixing plate, a second fixing plate, 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 on 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-generating unit according to claim 4, characterized in that, An avoidance groove is provided on the base plate, wherein the avoidance groove provides avoidance space for the first voice coil; or, The central magnetic circuit has a central portion connected to the first fixed plate and an outer peripheral portion located outside the central portion. The top surface of the outer peripheral portion is lower than the top surface of the central portion 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-generating unit according to claim 1, characterized in that, The airflow channel surrounds the central magnetic circuit, 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 spaced apart.

7. The sound-generating unit according to claim 3, characterized in that, The central magnetic circuit includes a central magnetic guide plate and a central magnetic assembly disposed on the central magnetic guide plate. The side magnetic circuit includes a side magnet and a side magnetic guide plate. A second magnetic gap is formed between the central magnetic guide plate and the bottom plate, and a first magnetic gap is formed between the side magnetic guide plate and the top plate.

8. The sound-generating unit according to claim 7, characterized in that, The central magnetic assembly 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 guide plate, and the height of the central annular magnet is lower than the height of the first central magnet; or, The central magnetic assembly includes a first central magnet disposed on the central magnetic plate and a second central magnet disposed 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-generating unit according to claim 1, characterized in that, The first folded ring is annular, and the inner edge of the first folded ring forms the second through hole, wherein, A dustproof net is provided to cover the second through hole, and the dustproof net is used to prevent external impurities from entering the interior of the sound-generating unit.

10. The sound-generating unit according to claim 1, characterized in that, A first cavity is formed between the first diaphragm, the bracket, and the magnetic yoke. The first cavity is a sealed cavity. A first leakage hole is provided on the sound-generating unit to connect the first cavity with the outside. A damping element is provided on the first leakage hole.

11. The sound-generating unit according to claim 9, characterized in that, The sound-generating unit further includes two positioning rings, which are respectively disposed between the outer edge of the second folded ring and the bracket, and between the outer edge of the third folded ring and the bracket; and / or The sound-generating 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 communicating with the second cavity and the outside is provided on the back cover.

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

13. The electronic device according to claim 12, characterized in that, A third leakage hole is also provided on the housing, and the third leakage hole communicates with the rear cavity.

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