Sound production device and electronic equipment

Abstract

The utility model discloses a sound production device and electronic equipment. The sound production device comprises a shell, a magnetic circuit system, a vibration system and a conductive piece, the magnetic circuit system is connected to the inner side of the shell; the vibration system comprises a first vibrating diaphragm and a second vibrating diaphragm which are respectively positioned on two opposite sides of the magnetic circuit system, and a first voice coil and a second voice coil which are respectively connected with the first vibrating diaphragm and the second vibrating diaphragm; the conductive part is arranged on the shell and provided with a first bonding pad, a second bonding pad and an outer conductive part, the first bonding pad and the second bonding pad are arranged in the first direction and are close to the first vibrating diaphragm and the second vibrating diaphragm respectively, the first direction is the vibration direction of the vibration system, and the second direction is the vibration direction of the vibration system; the first voice coil and the second voice coil are electrically connected with the first bonding pad and the second bonding pad respectively, and the outer conductive part is exposed out of the side surface of the shell and electrically connected with an external circuit. According to the sound production device provided by the invention, the number of the outer conductive parts outside the shell is reduced, the assembly space of the whole machine is saved, and the miniaturization design of a product is facilitated.

Description

Technical Field

[0001] This application belongs to the field of acoustic equipment technology, specifically relating to a sound-generating device and an electronic device. Background Technology

[0002] In a dual voice coil sound-generating device, four external solder pads are usually required on the outside of the housing. The two voice coils are connected to the external circuit through these four solder pads. The large number of external solder pads results in a large amount of external space being occupied, which is not conducive to the assembly of the whole machine when applied to electronic products. Utility Model Content

[0003] This application aims to provide a sound-generating device and electronic device to at least solve one of the problems of the prior art.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] According to a first aspect of this application, a sound-generating device is provided, comprising:

[0006] case;

[0007] A magnetic circuit system connected to the housing;

[0008] A vibration system, comprising a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil, wherein the first diaphragm and the second diaphragm are respectively located on opposite sides of the magnetic circuit system, and the first voice coil and the second voice coil are respectively connected to the first diaphragm and the second diaphragm;

[0009] A conductive element is disposed in the housing. The conductive element has a first pad, a second pad, and an external conductive portion that are electrically connected. In a first direction, the first pad and the second pad are arranged along the first direction and are respectively close to the first diaphragm and the second diaphragm. The first direction is the vibration direction of the vibration system. The first voice coil and the second voice coil are electrically connected to the first pad and the second pad, respectively. The external conductive portion is exposed on the side surface of the housing and is electrically connected to an external circuit.

[0010] Optionally, two conductive components are provided. The input and output ends of the first voice coil are respectively connected to the first pads of the two conductive components, and the input and output ends of the second voice coil are respectively connected to the second pads of the two conductive components. The external conductive portions of the two conductive components are arranged adjacent to each other.

[0011] And / or, the conductive component is a metal component, the conductive component is injection molded into the housing, and a portion of the metal component is exposed on the surface of the housing to form the first pad, the second pad, and the external conductive portion.

[0012] Optionally, two conductive elements are provided, and the two outer conductive portions of the two conductive elements are arranged adjacent to each other;

[0013] The first pad and the second pad are both located on the same side of the housing as the two external conductive parts, or one of the first pad and the second pad is located on the same side of the housing as the two external conductive parts, and the other is located on the side of the housing opposite to the two external conductive parts.

[0014] Optionally, the first pad and the second pad are at least partially opposite each other in the first direction;

[0015] Alternatively, the first pad and the second pad are at least partially opposite each other in the first direction, and the conductive element further includes a first connecting arm extending from one end of the external conductive portion along the first direction and a second connecting arm extending along a second direction, the second direction being perpendicular to the first direction, the other end of the first connecting arm being connected to the first pad, the other end of the second connecting arm being connected to the second pad, and the conductive element further includes a support arm extending from the end of the first pad away from the first connecting arm toward the second pad;

[0016] Alternatively, the conductive element extends from one side of the housing along the periphery of the housing to the other side, with the outer conductive portion and the second pad located at opposite ends of the conductive element, and the first pad located between the outer conductive portion and the second pad.

[0017] Optionally, the housing includes an upper shell and a lower shell connected to each other along a first direction, the conductive element is disposed on the upper shell or the lower shell, the outer periphery of the first diaphragm is connected to the upper shell and forms a first connection area, and the outer periphery of the second diaphragm is connected to the lower shell and forms a second connection area.

[0018] In the first direction, the first pad or the second pad is at least partially opposite to the first connection area or the second connection area;

[0019] And / or, the upper shell or the lower shell, or the upper shell and the lower shell, have a receiving gap corresponding to the position of the first pad or the second pad.

[0020] Optionally, the magnetic circuit system includes a central magnetic section, a side magnetic section, and a magnetically conductive yoke connecting the central magnetic section and the side magnetic section;

[0021] A first magnetic gap is formed between the central magnetic part and the magnetic yoke, and a second magnetic gap is formed between the side magnetic part and the magnetic yoke. The second magnetic gap is arranged around the first magnetic gap, and the first voice coil and the second voice coil are respectively suspended in the first magnetic gap and the second magnetic gap.

[0022] And / or, the first diaphragm includes a first folded portion and a first reinforcing portion, the first reinforcing portion is disposed at the center of the first folded portion, the outer edge of the first folded portion is connected to the housing, and the first voice coil is connected to the first reinforcing portion;

[0023] And / or, the second diaphragm includes a second folded portion and a second reinforcing portion, the second reinforcing portion is disposed at the center of the second folded portion, the outer edge of the second folded portion is connected to the housing, and the second voice coil is connected to the second reinforcing portion.

[0024] Optionally, the outer periphery of the first diaphragm is connected to the housing, the outer periphery of the second diaphragm is connected to the housing, and the inner periphery of the second diaphragm is connected to the magnetic circuit system, with a through-flow channel between the magnetic circuit system and the second diaphragm;

[0025] The sound-generating device has a first side of the second diaphragm facing away from the first diaphragm, and a second side of the first diaphragm facing away from the second diaphragm. The sound waves of the first diaphragm facing the first side are radiated outward through the airflow channel and together with the sound waves of the second diaphragm facing the first side are radiated towards the first side.

[0026] Optionally, the magnetic circuit system includes a central magnetic part, a side magnetic part, and a magnetically conductive yoke connecting the central magnetic part and the side magnetic part. The magnetically conductive yoke includes a top plate, a bottom plate, and a side plate connecting the top plate and the bottom plate. The bottom plate is connected to the housing.

[0027] The central magnetic part is connected to the top plate and forms a first magnetic gap with the side plate. The side magnetic part is connected to the bottom plate and forms a second magnetic gap with the side plate. The second magnetic gap is arranged around the first magnetic gap. The first voice coil and the second voice coil are respectively suspended in the first magnetic gap and the second magnetic gap.

[0028] The airflow channel passes sequentially through the central magnet, the top plate, and the second diaphragm.

[0029] Optionally, the top plate has a support wall that bends and extends toward the second diaphragm, and the inner edge of the second diaphragm is connected to the support wall; or, a support member is provided between the top plate and the second diaphragm, and the inner edge of the second diaphragm is connected to the support member, and the airflow channel passes through the central magnet, the top plate, the support member and the second diaphragm.

[0030] Optionally, it also includes a cover, which is disposed on the side of the first diaphragm away from the second diaphragm and forms a first cavity with the first diaphragm, and the cover has a first leakage hole communicating with the first cavity;

[0031] A second cavity is formed between the housing, the second diaphragm, and the magnetic circuit system, and the housing is provided with a second leakage hole communicating with the second cavity;

[0032] The sound waves from the first diaphragm and the second diaphragm facing the second side radiate outward through the first leakage hole and the second leakage hole, respectively.

[0033] Optionally, the first diaphragm and the second diaphragm vibrate in the same direction, the first side of the first diaphragm and the second diaphragm radiates a first sound wave to the external environment, the second side of the first diaphragm and the second diaphragm radiates a second sound wave to the external environment, and the first sound wave and the second sound wave are out of phase.

[0034] Alternatively, the sound-generating device is applied to an electronic device and is used to divide the space of the electronic device into an acoustically isolated front cavity and a rear cavity. The first side of the first diaphragm and the second diaphragm are connected to the front cavity, and the second side of the first diaphragm and the second diaphragm are connected to the rear cavity. The first diaphragm and the second diaphragm vibrate in the same direction and radiate a first sound wave to the front cavity and a second sound wave to the rear cavity. The first sound wave and the second sound wave are out of phase.

[0035] And / or, the second diaphragm includes an inner folded ring, a vibrating part and an outer folded ring connected in sequence, the inner periphery of the inner folded ring is connected to the magnetic circuit system, the outer periphery of the outer folded ring is connected to the housing, and the second voice coil is connected to the vibrating part;

[0036] And / or, the first diaphragm includes a first folded portion and a first reinforcing portion, the first reinforcing portion is disposed at the center of the first folded portion, the outer edge of the first folded portion is connected to the housing, and the first voice coil is connected to the first reinforcing portion.

[0037] According to a second aspect of this application, an electronic device is provided, comprising: the sound-generating device described in the first aspect.

[0038] Optionally, the electronic device includes: a housing and the sound-generating device described in the first aspect, the housing having a receiving cavity, the sound-generating device being disposed within the receiving cavity, and the receiving cavity being divided into an acoustically isolated front cavity and a rear cavity, the first side being in communication with the front cavity;

[0039] The outer shell is provided with a sound outlet hole that communicates with the front cavity. Sound waves from the first diaphragm and the second diaphragm facing the first side are radiated to the outside through the front cavity and the sound outlet hole.

[0040] Optionally, the outer casing is further provided with a vent hole, which communicates with the rear cavity;

[0041] The first diaphragm and the second diaphragm radiate sound waves that are out of phase with the sound waves in the front cavity into the rear cavity, and the sound waves in the rear cavity radiate to the outside through the vent hole.

[0042] In the embodiments of this application, by providing a conductive component including a first pad, a second pad, and an external conductive portion for electrical connection, and by connecting a first voice coil and a second voice coil to the first pad and the second pad on the conductive component, respectively, the input or output terminals of the two voice coils are connected to an external circuit through a single external conductive portion, thus reducing the number of external conductive portions. When applied to electronic devices, this can save overall space and assembly processes without affecting the sound-generating performance of the sound-generating device.

[0043] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0044] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0045] Figure 1 This is one of the schematic diagrams of the external structure of the sound-generating device provided in this application;

[0046] Figure 2 This is the second schematic diagram of the external structure of the sound-generating device provided in this application;

[0047] Figure 3 This is an exploded view of the sound-generating device provided in this application;

[0048] Figure 4 This is one of the structural schematic diagrams of the first conductive component provided in this application;

[0049] Figure 5 This is the second schematic diagram of the structure of the first conductive component provided in this application;

[0050] Figure 6 yes Figure 4 The conductive component in the diagram is used in a cross-sectional view of the sound-generating device.

[0051] Figure 7 yes Figure 4 A schematic diagram showing the connection between the first pad of the conductive component and the first voice coil;

[0052] Figure 8 yes Figure 4 A schematic diagram showing the connection between the second pad of the conductive component and the second voice coil;

[0053] Figure 9 This is a schematic diagram of the structure of the second type of conductive component provided in this application;

[0054] Figure 10 yes Figure 9 A cross-sectional view of the conductive components used in the sound-generating device;

[0055] Figure 11 yes Figure 9 A schematic diagram showing the connection between the first pad of the conductive component and the first voice coil;

[0056] Figure 12 yes Figure 11 Top view;

[0057] Figure 13 yes Figure 9 A schematic diagram showing the connection between the second pad of the conductive component and the second voice coil;

[0058] Figure 14 yes Figure 13 Top view.

[0059] Figure 15 This is a cross-sectional view of a sound-generating device with a housing provided in this application;

[0060] Figure 16 This is a cross-sectional view of a sound-generating device without a housing provided in this application.

[0061] Figure label:

[0062] 1. Cover; 11. First leakage hole;

[0063] 2. Shell; 21. Upper shell; 22. Lower shell; 221. Accommodation gap; 23. Second leakage hole;

[0064] 3. Magnetic circuit system; 31. Central magnet; 32. Central washer; 33. Side magnet; 34. Side washer; 35. Magnetic yoke; 351. First magnetic gap; 352. Second magnetic gap; 353. Top plate; 354. Bottom plate; 355. Side plate; 356. Support wall;

[0065] 4. Vibration system; 41. First diaphragm; 411. First folded loop; 412. First reinforcing part; 42. Second diaphragm; 421. Second connecting area; 422. Inner folded loop; 423. Vibrating part; 424. Outer folded loop; 43. First voice coil; 44. Second voice coil;

[0066] 5. Conductive component; 51. First pad; 52. Second pad; 53. External conductive part;

[0067] 6. Outer shell; 61. Sound outlet; 62. Vent; 63. Front cavity; 64. Rear cavity;

[0068] 7. Airflow channel. Detailed Implementation

[0069] Embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application are within the scope of protection of this application.

[0070] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0071] In the description of this application, 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", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0072] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0073] The following is combined Figures 1-15 This application describes a sound-generating device and an electronic device according to embodiments thereof.

[0074] like Figures 1 to 3 As shown, according to some embodiments of this application, a sound-generating device is provided, including: a housing 2, a magnetic circuit system 3, a vibration system 4, and a conductive element 5; the magnetic circuit system 3 is connected to the housing 2; the vibration system 4 includes a first diaphragm 41, a second diaphragm 42, a first voice coil 43, and a second voice coil 44, the first diaphragm 41 and the second diaphragm 42 are respectively located on opposite sides of the magnetic circuit system 3, and the first voice coil 43 and the second voice coil 44 are respectively connected to the first diaphragm 41 and the second diaphragm 42; the conductive element 5 is disposed on the housing 2, and the conductive element 5 has a first pad 51, a second pad 52, and an external conductive part 53 electrically connected, in a first direction, the first pad 51 and the second pad 52 are arranged along the first direction and are respectively close to the first diaphragm 41 and the second diaphragm 42, the first direction is the vibration direction of the vibration system 4, the first voice coil 43 and the second voice coil 44 are respectively electrically connected to the first pad 51 and the second pad 52, and the external conductive part 53 is exposed on the side surface of the housing and electrically connected to an external circuit.

[0075] Specifically, in this embodiment, a sound-generating device with dual voice coils and dual diaphragms is provided. The magnetic circuit system 3 is connected to the housing 2. The two diaphragms of the vibration system 4 are located on opposite sides of the magnetic circuit system 3. The two voice coils are connected to the two diaphragms and located within the two magnetic gaps formed by the magnetic circuit system 3. The two voice coils are connected to an external circuit, and the sound-generating performance of the device is achieved through the conversion of electrical energy and mechanical energy. The two voice coils are a first voice coil 43 and a second voice coil 44, and the two diaphragms are a first diaphragm 41 and a second diaphragm 42.

[0076] In the above embodiments of this application, a conductive element 5 is provided, which can be electrically connected to the first voice coil 43 and the second voice coil 44 through the first pad 51 and the second pad 52 respectively, that is, electrically connected to the input or output terminals of the first voice coil 43 and the second voice coil 44. This allows the first voice coil 43 and the second voice coil 44 to be electrically connected to the positive or negative terminal of the external circuit through the shared external conductive part 53. Compared with the traditional dual voice coil sound generating device, which requires two sets of conductive elements to connect the two voice coils and the external circuit respectively, that is, four external pads to be electrically connected to the external circuit, this application reduces the number of external conductive parts 53 by optimizing the structure of the conductive element 5, and achieves the purpose of saving space by integrating the structure of the conductive element 5.

[0077] Furthermore, in the vibration direction of the vibration system 4, based on the fact that the first diaphragm 41 and the second diaphragm 42 are located on opposite sides of the magnetic circuit system 3, and the first voice coil 43 and the second voice coil 44 are respectively connected to the first diaphragm 41 and the second diaphragm 42, the first pad 51 and the second pad 52 are arranged along the first direction and close to the first diaphragm 41 and the second diaphragm 42 respectively. This facilitates the connection of the first voice coil 43 and the second voice coil 44 to the first pad 51 and the second pad 52 respectively, avoids excessively long leads of the first voice coil 43 or the second voice coil 44 from interfering with other structures inside the sound-generating device, and improves the reliability of the sound-generating device. Here, the first direction is the vibration direction of the vibration system 4, that is, the vibration direction of the voice coil / diaphragm. The external conductive part 53 exposed on the side surface of the housing 2 can be flush with the side surface or protrude from the side surface.

[0078] In practical applications, two conductive elements 5 can be installed in the sound-generating device, such as... Figure 7 , Figure 8 , Figures 11 to 14 As shown, the input and output ends of the first voice coil 43 can be connected to the two first pads 51 of the two conductive parts 5 respectively, and the input and output ends of the second voice coil 44 can be connected to the two second pads 52 of the two conductive parts 5 respectively. Finally, they are connected to the positive and negative terminals of the external circuit through the two external conductive parts 53 on the two conductive parts 5 respectively, which greatly reduces the number of external conductive parts 53, saves the assembly space of the sound-generating device, and is conducive to the miniaturization design of the product.

[0079] In the above embodiments, the two external conductive parts 53 can be led out to the side wall of the housing 2 in the form of pins. The specific design can be made according to the specific assembly requirements of the product, and this application does not limit this. The positions of the first pad 51 and the second pad 52 in the first direction can be arranged opposite to each other or staggered. When there are two conductive parts 5, the structures of the two conductive parts 5 can be the same or different. In addition, the specific structure of the conductive parts 5 can be matched according to the internal structural features of the sound-generating device. The conductive parts 5 can be fixed to the housing 2 by means of bonding, injection molding, etc.

[0080] In the above embodiments, a first extension extending in a first direction and a second extension extending in a second direction are provided between the first pad 51 and the external conductive portion 53, or between the second pad 52 and the first pad 51, or between the second pad 52 and the external conductive portion 53, wherein the second direction is perpendicular to the first direction. Thus, the first pad 51 and the second pad 52 are located on opposite sides of the magnetic circuit system 3, and can be electrically connected to an external circuit via the external conductive portion 53.

[0081] Optionally, such as Figures 1 to 14As shown, there are two conductive components 5. The input and output ends of the first voice coil 43 are connected to the first pads 51 of the two conductive components, respectively. The input and output ends of the second voice coil 44 are connected to the second pads 52 of the two conductive components, respectively. The outer conductive parts 53 of the two conductive components are arranged adjacent to each other.

[0082] Optionally, the conductive component 5 is a metal component, which is injection molded into the housing 2, and a portion of the metal component is exposed on the surface of the housing 2 to form a first pad 51, a second pad 52, and an external conductive portion 53.

[0083] Specifically, in practical applications, when two conductive elements 5 are provided, the input and output terminals of the first voice coil 43 can be connected to the two first pads 51 of the two conductive elements 5, respectively, and the input and output terminals of the second voice coil 44 can be connected to the two second pads 52 of the two conductive elements 5, respectively. This allows the conductive elements 5 to simultaneously connect the first voice coil 43 and the second voice coil 44, reducing the number of external conductive parts 53 exposed on the surface of the housing 2 to two, significantly reducing the space occupied by the external conductive parts 53 in the overall device. Furthermore, the adjacent arrangement of the external conductive parts 53 of the two conductive elements 5 on the surface of the housing 2 further reduces the space occupied by the external conductive parts 53 and facilitates electrical connection with external circuits.

[0084] In the above embodiment, the conductive component 5 can be designed as a metal component and embedded in the housing 2 by injection molding. The first pad 51, the second pad 52, and the external conductive portion 53 are partially exposed on the surface of the housing 2. In this case, the two external conductive portions 53 can be led out to the side wall of the housing 2 in the form of pins, facilitating further insertion or soldering with external terminals. This embodiment saves space occupied by the conductive component 5, improves the stability of the connection between the conductive component 5 and the housing 2, and also enables the conductive component 5 to be insulated from other structures, avoiding any impact on the overall performance of the sound-generating device. In practical applications, the injection molding process can also improve product assembly efficiency.

[0085] Optionally, such as Figures 4 to 14 As shown, two conductive elements 5 are provided, and the two external conductive portions 53 of the two conductive elements 5 are arranged adjacent to each other. Further, the first pad 51 and the second pad 52 are located on the same side of the housing 2 as the two external conductive portions 53, or one of the first pad 51 and the second pad 52 is located on the same side of the housing 2 as the two external conductive portions 53, and the other is located on the side of the housing 2 opposite to the two external conductive portions 53.

[0086] Specifically, such as Figures 4 to 8As shown, in this embodiment, the first pad 51 and the second pad 52 of the two conductive elements 5 are located on the same side of the housing 2 as the two external conductive parts 53. This facilitates the connection of the first voice coil 43 and the second voice coil 44 to the conductive elements 5 respectively, and reduces the size of the conductive elements 5, further reducing the space occupied by the conductive elements 5.

[0087] More specifically, in this embodiment, both the first pad 51 and the second pad 52 are disposed adjacent to each other on the external conductive part 53.

[0088] In another embodiment, such as Figures 9 to 14 As shown, one of the first pad 51 and the second pad 52 is located on the same side of the housing 2 as the two external conductive parts 53, and the other is located on the opposite side of the housing 2 to the two external conductive parts 53. This allows the input and output ends of the first voice coil 43 and the second voice coil 44 to be led out to the opposite side of the housing 2, avoiding mutual interference between the leads of the first voice coil 43 and the second voice coil 44, improving the reliability of the sound-generating device, and adapting to different installation requirements.

[0089] Optionally, such as Figures 4 to 8 As shown, when the first pad 51 and the second pad 52 are located on the same side of the housing 2 along with the two external conductive parts 53, the first pad 51 and the second pad 52 are at least partially opposite each other in the first direction; as Figures 9 to 14 As shown, one of the first pad 51 and the second pad 52 is located on the same side of the housing 2 as the two external conductive parts 53, and the other is located on the side of the housing 2 opposite to the two external conductive parts 53. The conductive element 5 extends from one side of the housing 2 along the outer periphery of the housing 2 to the other side. The external conductive parts 53 and the second pad 52 are located at the two ends of the conductive element 5, respectively. The first pad 51 is located between the external conductive parts 53 and the second pad 52.

[0090] Specifically, in this embodiment, when the first pad 51 and the second pad 52 are located on the same side of the housing 2 as the two external conductive parts 53, the first pad 51 and the second pad 52 are at least partially opposite each other in the first direction, that is, the projections of the first pad 51 and the second pad 52 in the first direction at least partially overlap, which saves the space occupied by the conductive part 5 and facilitates the connection of the first voice coil 43 and the second voice coil 44 to the first pad 51 and the second pad 52 respectively.

[0091] Furthermore, the conductive component 5 also includes a first connecting arm extending from one end of the outer conductive portion 53 along a first direction and a second connecting arm extending along a second direction, the second direction being perpendicular to the first direction. The other end of the first connecting arm is connected to the first pad 51, and the other end of the second connecting arm is connected to the second pad 52. The conductive component 5 also includes a support arm that bends and extends from the end of the first pad 51 away from the first connecting arm toward the second pad 52. This arrangement allows the conductive component 5 to have a more compact structure and higher reliability.

[0092] Specifically, in this embodiment, when one of the first pad 51 and the second pad 52 is located on the same side of the housing 2 as the two external conductive parts 53, and the other is located on the opposite side of the housing 2 to the two external conductive parts 53, the conductive element 5 is designed to extend from one side of the housing 2 along the outer periphery of the housing 2 to the opposite side of the housing 2. The external conductive parts 53 and the second pad 52 are respectively located at both ends of the conductive element 5, and the first pad 51 is located between the external conductive parts 53 and the second pad 52. This design can accommodate more assembly requirements. In practical applications, the specific positions of the first pad 51 and the second pad 52 can be designed according to actual needs, and this application does not impose any restrictions on this.

[0093] Optionally, such as Figure 6 and Figure 10 As shown, the housing 2 includes an upper housing 21 and a lower housing 22 that are interconnected along a first direction, and the conductive element 5 is disposed on the upper housing 21 or the lower housing 22.

[0094] Specifically, in this embodiment, the housing 2 is assembled by connecting the upper housing 21 and the lower housing 22. This facilitates the assembly of the entire sound-generating device. In some embodiments, the side wall of the housing 2 is also provided with a second leakage hole 23 that connects to the opposite side of the magnetic circuit system 3 to achieve the sound-generating performance of the sound-generating device. The structural design of the upper housing 21 and the lower housing 22 also reduces the manufacturing difficulty of the housing 2. At the same time, the first solder pad 51, the second solder pad 52, and the external conductive part 53 are exposed on the surface of the upper housing 21 or the surface of the lower housing 22.

[0095] Optionally, such as Figure 6 and Figure 10 As shown, the housing 2 includes an upper housing 21 and a lower housing 22 connected to each other along a first direction. A conductive element 5 is disposed on the upper housing 21 or the lower housing 22. The outer periphery of the first diaphragm 41 is connected to the upper housing 21 and forms a first connection area. The outer periphery of the second diaphragm 42 is connected to the lower housing 22 and forms a second connection area 421. In the first direction, the first pad 51 or the second pad 52 is at least partially opposite to the first connection area or the second connection area 421.

[0096] Optionally, the upper shell 21 or the lower shell 22, or the upper shell 21 and the lower shell 22, have a receiving gap 221 corresponding to the position of the first pad 51 or the second pad 52.

[0097] Specifically, in this embodiment, the outer periphery of the first diaphragm 41 is connected to the upper shell 21, and the area where the first diaphragm 41 and the upper shell 21 are connected forms the first connection area. The outer periphery of the second diaphragm 42 is connected to the lower shell 22, and the area where the second diaphragm 42 and the lower shell 22 are connected forms the second connection area 421. In the first direction, at least a portion of the first pad 51 is disposed opposite to the first connection area, and at least a portion of the second pad 52 is disposed opposite to the second connection area 421.

[0098] In the above embodiments, at least a portion of the first pad 51 is disposed opposite to the first connection area, meaning that the projection of the first pad 51 in the first direction can fall completely within the first connection area or partially within the first connection area; at least a portion of the second pad 52 is disposed opposite to the second connection area 421, meaning that the projection of the second pad 52 in the first direction can fall completely within the second connection area 421 or partially within the second connection area 421. The specific design depends on the specific structure of the housing 2, the internal space of the housing 2, etc., and this application does not impose any restrictions on this.

[0099] When the first pad 51 is positioned opposite to at least a portion of the first connection area, and the second pad 52 is positioned opposite to at least a portion of the second connection area 421, the conductive element 5 can be designed as close as possible to the edge of the housing 2, reducing the space occupied inside the housing 2 and maximizing the space inside the housing 2. At the same time, it is beneficial to maximize the design of the magnetic circuit system 3, the first diaphragm 41 and the second diaphragm 42 inside the housing 2.

[0100] Furthermore, in the above embodiment, a Z-direction accommodating gap 221 is provided on the housing 2 corresponding to the positions of the first pad 51 and the second pad 52. This gap can serve as a reserved space for solder joints when the first voice coil 43 and the second voice coil 44 are soldered to the first pad 51 and the second pad 52, respectively, thus improving the rationality of the product structure design. The accommodating gap 221 can typically be located between the upper housing 21 and the lower housing 22, formed by a recess in either the upper or lower housing 22, or it can be located on the lower housing 22 and formed by a recess in the lower housing 22, or it can be located on the upper housing 21 and formed by a recess in the upper housing 21. The design is flexible and can be adjusted according to the specific positions of the first pad 51 and the second pad 52.

[0101] In some embodiments, the outer peripheries of the first diaphragm 41 and the second diaphragm 42 are both connected to the housing 2 by adhesive, and the first connection area and the second connection area 421 can generally be understood as the adhesive application area. The connection between the first diaphragm 41 and the upper housing 21, and the connection between the second diaphragm 42 and the lower housing 22, can be bonded by positioning rings (steel rings).

[0102] Optionally, the magnetic circuit system 3 includes a central magnetic part, a side magnetic part, and a magnetically conductive yoke 35 connecting the central magnetic part and the side magnetic part; a first magnetic gap 351 is formed between the central magnetic part and the magnetically conductive yoke 35, and a second magnetic gap 352 is formed between the side magnetic part and the magnetically conductive yoke 35. The second magnetic gap 352 is arranged around the first magnetic gap 351, and the first voice coil 43 and the second voice coil 44 are respectively suspended in the first magnetic gap 351 and the second magnetic gap 352.

[0103] Specifically, in this embodiment, the central magnetic part typically includes a central magnet 31 and a central washer 32, and the side magnetic part typically includes a side magnet 33 and a side washer 34. A magnetic yoke 35 connects the side magnetic part and the central magnetic part to form a surrounding first magnetic gap 351 and a second magnetic gap 352. This design effectively utilizes the inner space of the housing 2, further miniaturizing the sound-generating device. The first voice coil 43 and the second voice coil 44 are respectively suspended within the first magnetic gap 351 and the second magnetic gap 352 to achieve the sound-generating performance of the device.

[0104] In the above embodiment, the first diaphragm 41 includes a first folded ring portion 411 and a first reinforcing portion 412. The first reinforcing portion 412 is disposed at the center of the first folded ring portion 411. The outer edge of the first folded ring portion 411 is connected to the housing 2, and the first voice coil 43 is connected to the first reinforcing portion 412. The first folded ring portion 411 and the first reinforcing portion 412 can be integrally formed or separately disposed; this is not limited here. It is understood that the first folded ring portion 411 can be an upwardly convex structure or a downwardly concave structure; this is not limited here. Optionally, the first folded ring portion 411 protrudes in a direction away from the magnetic circuit system 3.

[0105] In the above embodiment, the second diaphragm 42 may also include a second folded ring portion and a second reinforcing portion. The second reinforcing portion is located at the center of the second folded ring portion, and the outer edge of the second folded ring portion is connected to the housing 2. The second voice coil 44 is connected to the second reinforcing portion. The second folded ring portion and the second reinforcing portion may be integrally formed or separately disposed. The second folded ring portion is an upwardly convex structure or a downwardly concave structure. Optionally, the second folded ring portion protrudes in a direction away from the magnetic circuit system 3.

[0106] Optionally, such as Figure 6 , Figure 10 , Figure 15 and Figure 16As shown, the outer periphery of the first diaphragm 41 is connected to the housing 2, the outer periphery of the second diaphragm 42 is connected to the housing 2, and the inner periphery of the second diaphragm 42 is connected to the magnetic circuit system 3. A through airflow channel 7 is provided between the magnetic circuit system 3 and the second diaphragm 42. The sound-generating device has a first side of the second diaphragm 42 facing away from the first diaphragm 41, and a second side of the first diaphragm 41 facing away from the second diaphragm 42. The sound waves of the first diaphragm 41 facing the first side are radiated outward through the airflow channel 7, and together with the sound waves of the second diaphragm 42 facing the first side, they radiate towards the first side.

[0107] Specifically, in this embodiment, the sound waves from the first diaphragm 41 facing the first side radiate outward through the airflow channel, and together with the sound waves from the second diaphragm 42 facing the first side, radiate outward to the first side. This achieves the effect of mutual superposition and enhancement of the sound waves from the first diaphragm 41 and the second diaphragm 42, improving the high-frequency performance of the sound-generating device. The airflow channel 7 facilitates the outward radiation of the sound waves from the first side of the second diaphragm 42 through this airflow channel. This allows the sound waves from the first diaphragm 41 and the first side of the second diaphragm 42 to radiate outward together on the same side of the sound-generating device. This is beneficial for the superposition of compressed air during the vibration of the first diaphragm 41 and the second diaphragm 42, improving the loudness and sensitivity of the sound-generating device.

[0108] Optionally, such as Figure 15 and Figure 16 As shown, the magnetic circuit system 3 includes a central magnetic part, a side magnetic part, and a magnetically conductive yoke 35 connecting the central magnetic part and the side magnetic part. The magnetically conductive yoke 35 includes a top plate 353, a bottom plate 354, and a side plate 355 connecting the top plate 353 and the bottom plate 354. The bottom plate 354 is connected to the housing 2. The central magnetic part is connected to the top plate 353 and forms a first magnetic gap 351 with the side plate 355. The side magnetic part is connected to the bottom plate 354 and forms a second magnetic gap 352 with the side plate 355. The second magnetic gap 352 is arranged around the first magnetic gap 351. The first voice coil 43 and the second voice coil 44 are respectively suspended in the first magnetic gap 351 and the second magnetic gap 352. The airflow channel 7 passes through the central magnetic part, the top plate 353, and the second diaphragm 42 in sequence.

[0109] Specifically, in this embodiment, the magnetic yoke 35 can be selected as an integrally formed structure, which can improve the structural strength of the magnetic yoke 35 and thus enhance installation stability. The side plates 355 of the magnetic yoke 35 can optionally surround the periphery of the top plate 353 and be angled with the top plate 353. The side plates 355 and the top plate 353 enclose a receiving cavity, in which the central magnetic part is disposed and connected to the top plate 353, and spaced from the side plates 355 to form a first magnetic gap 351. The bottom plate 354 can optionally be connected to the end of the side plate 355 away from the top plate 353. The bottom plate 354 extends in a direction away from the receiving cavity and is angled with the side plates 355. The edge magnetic part is disposed on the bottom plate 354 and spaced from the side plates 355 to form a second magnetic gap 352. That is, the edge magnetic part and the central magnetic part are located on opposite sides of the side plates 355.

[0110] In one embodiment, the top plate 353 and the bottom plate 354 are connected to both ends of the side plate 355 along the vibration direction of the vibration system 4. The top plate 353 and the bottom plate 354 are distributed vertically along the vibration direction of the vibration system 4, that is, the top plate 353 and the bottom plate 354 have a height difference in the vibration direction of the vibration system 4. This ensures that the size of the magnetic circuit system 3 along the vibration direction of the vibration system 4 is not too large, thereby achieving a thin and light design.

[0111] Optionally, such as Figure 15 and Figure 16 As shown, the top plate 353 has a support wall 356 that bends and extends toward the second diaphragm 42, and the inner edge of the second diaphragm 42 is connected to the support wall 356. The support wall 356 is located on the side of the top plate 353 of the magnetic yoke 35 facing away from the central magnetic part, and together with the top plate 353, forms an airflow channel 7.

[0112] In another embodiment, a support member is provided between the top plate 353 and the second diaphragm 42. The inner edge of the second diaphragm 42 is connected to the support member, and the airflow channel 7 passes through the central magnetic part, the top plate 353, the support member, and the second diaphragm 42. The support member connects and fixes the inner edge of the second diaphragm 42, and simultaneously forms the airflow channel 7 by enclosing the magnetic circuit system 3. This design simplifies the magnetic yoke 35, facilitates its modification, and allows for further optimization of the magnetic circuit structure 3.

[0113] Optionally, such as Figures 1 to 3 ,as well as Figure 15 As shown, the sound-generating device also includes a cover 1, which is disposed on the side of the first diaphragm 41 away from the second diaphragm 42 and forms a first cavity with the first diaphragm 41. The cover 1 has a first leakage hole 11 communicating with the first cavity. A second cavity is formed between the housing 2, the second diaphragm 42 and the magnetic circuit system 3. The housing 2 is provided with a second leakage hole 23 communicating with the second cavity. Sound waves from the first diaphragm 41 and the second diaphragm 42 facing the second side are radiated outward through the first leakage hole 11 and the second leakage hole 23, respectively.

[0114] Specifically, in this embodiment, the cover 1 serves two purposes: firstly, it protects the first diaphragm 41; secondly, by forming a first cavity between the cover 1 and the first diaphragm 41, it ensures the amplitude of the first diaphragm 41. It is understood that by providing a first leakage hole 11 in the cover 1, sound waves from the first side of the first diaphragm 41 can be radiated outwards through the first leakage hole 11. In practical applications, a mesh can also be provided at the center of the second diaphragm 42 to balance the air pressure on both sides.

[0115] Optionally, such as Figure 16 As shown, the cover 1 is a metal part machined from metal, which facilitates strong support for the sound-generating device during assembly while also reducing its footprint on the overall device. In specific applications, the number of first leakage holes 11 is set according to the actual situation and is not limited to a fixed number. Preferably, the first leakage holes 11 are provided with damping elements or breathable membranes, which can further adjust the airflow velocity of the first cavity and adjust the acoustic impedance of the first cavity.

[0116] Optionally, such as Figure 15 and Figure 16 As shown, the first diaphragm 41 and the second diaphragm 42 vibrate in the same direction. The first side of the first diaphragm 41 and the second diaphragm 42 radiates a first sound wave to the external environment, and the second side of the first diaphragm 41 and the second diaphragm 42 radiates a second sound wave to the external environment. The first sound wave and the second sound wave are out of phase. In this way, both the first side and the second side are connected to the external environment, and the sound waves radiated by the first side and the second side are out of phase. The sound waves on both sides cancel each other out in the far field, which is suitable for environments that require far-field noise reduction and privacy protection.

[0117] In another embodiment, the sound-generating device is applied to an electronic device and is used to divide the space of the electronic device into an acoustically isolated front cavity 63 and a rear cavity 64. The first side of the first diaphragm 41 and the second diaphragm 42 are connected to the front cavity 63, and the second side of the first diaphragm 41 and the second diaphragm 42 are connected to the rear cavity 64. The first diaphragm 41 and the second diaphragm 42 vibrate in the same direction and radiate a first sound wave to the front cavity 63 and a second sound wave to the rear cavity 64. The first sound wave and the second sound wave are out of phase.

[0118] Understandably, electronic devices typically have a sound outlet 61 for the sound waves from the front cavity 63 to radiate. When using the electronic device, the sound waves from the front cavity 63 can be radiated through the sound outlet 61 and received by the user. Furthermore, the sound waves from the rear cavity 64 can optionally radiate through the vent 62. In this way, the sound waves from the front and rear cavities can form an acoustic dipole, achieving the technical effect of reducing sound leakage. Alternatively, the sound waves from the rear cavity 64 may not radiate outwards. The sound-generating device of this application only serves to enhance the high-frequency performance by superimposing the sound waves from the first side of the first diaphragm 41 and the second diaphragm 42. The appropriate method should be chosen based on the actual situation.

[0119] In one embodiment, the second diaphragm 42 includes an inner folded ring 422, a vibrating part 423, and an outer folded ring 424 connected in sequence. The inner periphery of the inner folded ring 422 is connected to the magnetic circuit system 3, and the outer periphery of the outer folded ring 424 is connected to the housing 2. The second voice coil 44 is connected to the vibrating part 423. It is understood that by setting the second diaphragm 42 as a double-folded ring structure, the second voice coil 44 can drive the second diaphragm 42 to vibrate while simultaneously improving the compliance of the second diaphragm 42 and enhancing its high-frequency performance. The inner folded ring 422, the vibrating part 423, and the outer folded ring 424 of the second diaphragm 42 are integrally molded, which simplifies the processing steps of the second diaphragm 42 and improves its structural strength.

[0120] In one embodiment, the first diaphragm 41 includes a first loop portion 411 and a first reinforcing portion 412. The first reinforcing portion 412 is located at the center of the first loop portion 411. The outer edge of the first loop portion 411 is connected to the housing 2, and the first voice coil 43 is connected to the first reinforcing portion 412. The first loop portion 411 and the first reinforcing portion 412 can be integrally formed or separately configured. The first loop portion 411 protrudes in a direction away from the magnetic circuit system 3. It is understood that when the outer edge of the first loop portion 411 is connected to the housing 2, and the first voice coil 43 is connected to the first reinforcing portion 412, the vibration of the first voice coil 43 drives the first diaphragm 41 to vibrate, thereby causing the sound waves of the first diaphragm 41 to radiate outward along the airflow channel 7.

[0121] Optionally, such as Figure 15 and Figure 16 As shown, the present application provides an electronic device including a housing 6 and a sound-generating device. The housing 6 has a receiving cavity, the sound-generating device is disposed in the receiving cavity, and the receiving cavity is divided into an acoustically isolated front cavity 63 and a rear cavity 64. The first side is connected to the front cavity 63. The housing 6 is provided with a sound outlet 61 that connects to the front cavity 63. Sound waves from the first diaphragm 41 and the second diaphragm 42 facing the first side are radiated to the outside through the front cavity 63 and the sound outlet 61.

[0122] Specifically, in this embodiment, the outer shell 6 can be a one-piece structure or a split structure, and is not limited thereto. Furthermore, the outer contour of the outer shell 6 can be a square structure, or a circle or other suitable shape, and is not limited to a specific shape. The outer shell 6 is provided with a sound outlet 61 communicating with the front cavity 63, so that sound waves from the first side of the first diaphragm 41 and the second diaphragm 42 of the sound-generating device radiate to the outside through the front cavity 63 and the sound outlet 61. Optionally, as... Figure 15 and Figure 16 As shown, the outer casing 6 is also provided with a vent 62, which is connected to the rear cavity 64. The first diaphragm 41 and the second diaphragm 42 radiate sound waves with opposite phase to the sound waves in the front cavity 63 into the rear cavity 64, and the sound waves in the rear cavity 64 radiate to the outside through the vent 62. The vent 62 can be a round hole, an elliptical hole, or a polygonal hole, etc., and the number of vent 62 can be one or more, depending on the actual application design, and is not limited here.

[0123] According to a second aspect of this application, an electronic device is provided, comprising: a sound-emitting device as described in the first aspect.

[0124] Specifically, in this embodiment, when the sound-generating device provided in the first aspect is applied to an electronic device, the number of external conductive parts 53 used for connecting external circuits is small, saving internal space. This facilitates the miniaturization of the electronic product and simplifies the assembly process with the sound-generating device. The electronic device can be a mobile phone, tablet computer, or other similar device; this application does not limit its scope.

[0125] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0126] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A sound producing device, characterized by, The shell comprises: A magnetic circuit system connected to the shell; A vibration system comprising a first diaphragm, a second diaphragm, a first voice coil and a second voice coil, the first diaphragm and the second diaphragm are respectively located on the opposite sides of the magnetic circuit system, and the first voice coil and the second voice coil are respectively connected to the first diaphragm and the second diaphragm; An electrically conductive part provided on the shell, the electrically conductive part has a first pad, a second pad and an outer conductive part, the first pad and the second pad are arranged along a first direction and are respectively close to the first diaphragm and the second diaphragm, the first direction is the vibration direction of the vibration system, the first voice coil and the second voice coil are respectively electrically connected to the first pad and the second pad, and the outer conductive part is exposed on the side surface of the shell and is electrically connected to an external circuit. The electrically conductive part is provided with two, the wire inlet end and the wire outlet end of the first voice coil are respectively connected to the first pads of the two electrically conductive parts, the wire inlet end and the wire outlet end of the second voice coil are respectively connected to the second pads of the two electrically conductive parts, and the outer conductive parts of the two electrically conductive parts are arranged adjacent to each other; 2. The sound production device of claim 1, wherein, And / or, the electrically conductive part is a metal part, the electrically conductive part is injection molded on the shell, and part of the metal part is exposed on the surface of the shell to form the first pad, the second pad and the outer conductive part. The electrically conductive part is provided with two, and the two outer conductive parts of the two electrically conductive parts are arranged adjacent to each other; 3. The sound production device of claim 1, wherein, The first pad and the second pad are located on the same side of the shell as the two outer conductive parts, or one of the first pad and the second pad is located on the same side of the shell as the two outer conductive parts, and the other is located on the side of the shell opposite to the two outer conductive parts. The first pad and the second pad are at least partially opposite in the first direction; 4. The sound production device of claim 3, wherein, Or, the first pad and the second pad are at least partially opposite in the first direction, the electrically conductive part further comprises a first connecting arm extending from one end of the outer conductive part along the first direction and a second connecting arm extending along a second direction perpendicular to the first direction, the other end of the first connecting arm is connected to the first pad, the other end of the second connecting arm is connected to the second pad, and the electrically conductive part further comprises a support arm extending from one end of the first pad away from the first connecting arm to the second pad; Or, the electrically conductive part extends from one side of the shell along the circumference of the shell to the other side, the outer conductive part and the second pad are respectively located at both ends of the electrically conductive part, and the first pad is located between the outer conductive part and the second pad. The shell comprises an upper shell and a lower shell connected to each other along a first direction, the electrically conductive part is arranged on the upper shell or the lower shell, the outer periphery of the first diaphragm is connected to the upper shell and forms a first connecting area, and the outer periphery of the second diaphragm is connected to the lower shell and forms a second connecting area; 5. The sound production device of claim 1, wherein, ​ In the first direction, the first pad or the second pad is at least partially opposite to the first connecting area or the second connecting area; And / or, the upper shell or the lower shell or the upper shell and the lower shell has a receiving gap corresponding to the position of the first pad or the second pad.

6. The sound production device of claim 1, wherein, The magnetic circuit system comprises a center magnetic part, a side magnetic part, and a magnetic conductive yoke connecting the center magnetic part and the side magnetic part; The center magnetic part and the magnetic conductive yoke form a first magnetic gap, the side magnetic part and the magnetic conductive yoke form a second magnetic gap, the second magnetic gap is arranged around the first magnetic gap, and the first voice coil and the second voice coil are respectively suspended in the first magnetic gap and the second magnetic gap; And / or, the first diaphragm comprises a first folded ring part and a first reinforcing part, the first reinforcing part is arranged at the center of the first folded ring part, the outer edge of the first folded ring part is connected with the shell, and the first voice coil is connected with the first reinforcing part; And / or, the second diaphragm comprises a second folded ring part and a second reinforcing part, the second reinforcing part is arranged at the center of the second folded ring part, the outer edge of the second folded ring part is connected with the shell, and the second voice coil is connected with the second reinforcing part.

7. The sound production device of claim 1, wherein, The outer periphery of the first diaphragm is connected with the shell, the outer periphery of the second diaphragm is connected with the shell, and the inner periphery of the second diaphragm is connected with the magnetic circuit system, and an airflow passage is arranged to communicate through the magnetic circuit system and the second diaphragm; The sound generating device has a first side of the second diaphragm facing away from the first diaphragm, and a second side of the first diaphragm facing away from the second diaphragm, sound waves from the first side of the first diaphragm are radiated outward through the airflow passage, and are radiated together with sound waves from the first side of the second diaphragm to the first side.

8. The sound production device of claim 7, wherein, The magnetic circuit system comprises a center magnetic part, a side magnetic part, and a magnetic conductive yoke connecting the center magnetic part and the side magnetic part, the magnetic conductive yoke comprises a top plate, a bottom plate, and a side plate connecting the top plate and the bottom plate, and the bottom plate is connected with the shell; The center magnetic part is connected with the top plate and forms a first magnetic gap with the side plate, the side magnetic part is connected with the bottom plate and forms a second magnetic gap with the side plate, the second magnetic gap is arranged around the first magnetic gap, and the first voice coil and the second voice coil are respectively suspended in the first magnetic gap and the second magnetic gap; The airflow passage sequentially penetrates the center magnetic part, the top plate, and the second diaphragm.

9. The sound production device of claim 8, wherein, The top plate has a support wall bent and extended towards the second diaphragm, and the inner edge of the second diaphragm is connected to the support wall; or, a support member is arranged between the top plate and the second diaphragm, the inner edge of the second diaphragm is connected to the support member, and the airflow passage penetrates the center magnetic part, the top plate, the support member, and the second diaphragm.

10. The sound production device of claim 7, wherein, Further comprising a cover, the cover is arranged on the side of the first diaphragm away from the second diaphragm and forms a first cavity with the first diaphragm, and the cover has a first leakage hole communicating with the first cavity. A second cavity is formed between the shell, the second diaphragm and the magnetic circuit system, and the shell is provided with a second leakage hole in communication with the second cavity; Sound waves facing the second side of the first diaphragm and the second diaphragm are respectively radiated outward through the first leakage hole and the second leakage hole.

11. Sound production device according to any of claims 7-10, characterized in that The first diaphragm and the second diaphragm vibrate in the same direction, the first side of the first diaphragm and the second diaphragm radiate first sound waves to the external environment, the second side of the first diaphragm and the second diaphragm radiate second sound waves to the external environment, and the first sound waves and the second sound waves are opposite in phase; Alternatively, the sound generating device is applied to an electronic device and used to divide the space of the electronic device into an acoustically isolated front cavity and a rear cavity, the first side of the first diaphragm and the second diaphragm is in communication with the front cavity, the second side of the first diaphragm and the second diaphragm is in communication with the rear cavity, the first diaphragm and the second diaphragm vibrate in the same direction and radiate first sound waves to the front cavity and second sound waves to the rear cavity, and the first sound waves and the second sound waves are opposite in phase; And / or, the second diaphragm comprises an inner folding ring, a vibrating part and an outer folding ring connected in sequence, the inner periphery of the inner folding ring is connected with the magnetic circuit system, the outer periphery of the outer folding ring is connected with the shell, and the second voice coil is connected with the vibrating part; And / or, the first diaphragm comprises a first folding ring part and a first reinforcing part, the first reinforcing part is arranged at the center of the first folding ring part, the outer edge of the first folding ring part is connected with the shell, and the first voice coil is connected with the first reinforcing part.

12. An electronic device, comprising: Comprising: The sound generating device of any one of claims 1-11.

13. An electronic device, comprising: Comprising: The shell and the sound generating device of any one of claims 7-11, the shell has a receiving cavity, the sound generating device is arranged in the receiving cavity and divides the receiving cavity into an acoustically isolated front cavity and a rear cavity, and the first side is in communication with the front cavity; Wherein, the shell is provided with a sound outlet hole in communication with the front cavity, and sound waves facing the first side of the first diaphragm and the second diaphragm are radiated to the external environment through the front cavity and the sound outlet hole.

14. The electronic device of claim 13, wherein, The shell is also provided with a gas leakage hole in communication with the rear cavity; The first diaphragm and the second diaphragm radiate sound waves to the rear cavity which are opposite in phase to the sound waves of the front cavity, and the sound waves of the rear cavity are radiated to the external environment through the gas leakage hole.

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