Sound production device and electronic equipment

Abstract

The invention 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 technical field of acoustic devices, and particularly relates to a sound generating device and an electronic device. Background Art

[0002] In a sound generating device with a dual voice coil structure, usually four external connection pads need to be provided on the outside of its housing, and then the two voice coils are connected to an external circuit by connecting the four external connection pads to the external circuit. The large number of external connection pads results in a large external space occupied by them, which is not conducive to the assembly of the whole machine when applied to electronic products. Summary of the Invention

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

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

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

[0006] A housing;

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

[0008] A vibration system, the vibration system including 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 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 member, the conductive member being disposed on the housing. The conductive member has a first pad, a second pad, and an outer 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 respectively electrically connected to the first pad and the second pad, and the outer conductive portion is exposed on the side surface of the housing and is electrically connected to an external circuit.

[0010] Optionally, there are two conductive members. The incoming wire end and the outgoing wire end of the first voice coil are respectively connected to the first pads of the two conductive members, the incoming wire end and the outgoing wire end of the second voice coil are respectively connected to the second pads of the two conductive members, and the outer conductive portions of the two conductive members are adjacently arranged;

[0011] And / or, the conductive member is a metal member, the conductive member is injection molded in the housing, and a partial area of the metal member is exposed on the surface of the housing to form the first pad, the second pad, and the outer conductive portion.

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

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

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

[0015] Alternatively, the first pad and the second pad are at least partially opposite to each other in the first direction. The conductive member further includes a first connecting arm extending along the first direction from one end of the outer conductive portion 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 conductive member further includes a support arm extending and bending from the end of the first pad away from the first connecting arm towards the second pad;

[0016] Alternatively, the conductive member extends from one side of the housing along the periphery of the housing to the other side. The outer conductive portion and the second pad are respectively located at two ends of the conductive member, and the first pad is located between the outer conductive portion and the second pad.

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

[0018] In the first direction, the first pad or the second pad and the first connection area or the second connection area are at least partially opposite to each other;

[0019] And / or, there is an accommodation gap at a position corresponding to the first pad or the second pad on the upper housing or the lower housing or between the upper housing and the lower housing.

[0020] Optionally, the magnetic circuit system includes a central magnetic portion, an edge magnetic portion, and a magnetic yoke connecting the central magnetic portion and the edge magnetic portion;

[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 disposed 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;

[0022] And / or, the first diaphragm includes a first folding ring part and a first reinforcing part. The first reinforcing part is disposed at the center of the first folding ring part. The outer edge of the first folding ring part is connected to the housing, and the first voice coil is connected to the first reinforcing part;

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

[0024] Optionally, the outer peripheral edge of the first diaphragm is connected to the housing, the outer peripheral edge of the second diaphragm is connected to the housing, and the inner peripheral edge of the second diaphragm is connected to the magnetic circuit system. A through-flow air channel is provided 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 wave of the first diaphragm facing the first side is radiated outward through the air channel and jointly radiates to the first side with the sound wave of the second diaphragm facing the first side.

[0026] Optionally, the magnetic circuit system includes a central magnetic part, a side magnetic part, and a magnetic yoke connecting the central magnetic part and the side magnetic part. The magnetic 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 disposed 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 air channel sequentially penetrates through the central magnetic part, the top plate, and the second diaphragm.

[0029] Optionally, 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 provided between the top plate and the second diaphragm, the inner edge of the second diaphragm is connected to the support member, and the air channel penetrates through the central magnetic part, the top plate, the support member, and the second diaphragm.

[0030] Optionally, it further includes a cover body which is disposed on a side of the first diaphragm away from the second diaphragm and forms a first cavity with the first diaphragm, and the cover body 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 of the first diaphragm and the second diaphragm facing the second side are respectively radiated outward through the first leakage hole and the second leakage hole.

[0033] Optionally, the first diaphragm and the second diaphragm vibrate in the same direction. The first sides of the first diaphragm and the second diaphragm radiate a first sound wave to the external environment, and the second sides of the first diaphragm and the second diaphragm radiate 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 sides of the first diaphragm and the second diaphragm communicate with the front cavity, and the second sides of the first diaphragm and the second diaphragm communicate with 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, and the first sound wave and the second sound wave are out of phase;

[0035] And / or, the second diaphragm includes an inner folding ring, a vibrating part and an outer folding ring which are connected in sequence. The inner peripheral edge of the inner folding ring is connected to the magnetic circuit system, the outer peripheral edge of the outer folding 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 folding ring part and a first reinforcing part. The first reinforcing part is disposed at the center of the first folding ring part. The outer edge of the first folding ring part is connected to the housing, and the first voice coil is connected to the first reinforcing part.

[0037] According to a second aspect of the present application, there is provided an electronic device, including: 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 has a receiving cavity. The sound generating device is disposed in the receiving cavity and divides the receiving cavity into an acoustically isolated front cavity and a rear cavity, and the first side communicates with the front cavity;

[0039] The housing is provided with a sound outlet hole communicating with the front cavity, and the sound waves of 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 housing is further provided with an air leakage hole, and the air leakage hole is communicated with the rear cavity;

[0041] The first diaphragm and the second diaphragm radiate sound waves with a phase opposite to that of the sound waves in the front cavity to the rear cavity, and the sound waves in the rear cavity are radiated to the outside through the air leakage hole.

[0042] In the embodiments of the present application, a conductive member is provided that includes a first solder pad, a second solder pad, and an external conductive portion that are electrically connected. The first and second voice coils are respectively connected to the first and second solder pads on the conductive member. This allows the input and output terminals of the two voice coils to be connected to an external circuit via a single external conductive portion, thereby reducing the number of external conductive portions. When used in electronic devices, this can save space and assembly steps without affecting the sound performance of the sound-generating device.

[0043] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0049] Figure 5 This is the second structural diagram of the first conductive member provided by this application;

[0050] Figure 6 yes Figure 4 A cross-sectional view of a conductive member used in a sound-generating device.

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

[0052] Figure 8 Is Figure 4 Schematic diagram of the connection between the second pad of the conductive part in

[0053] Figure 9 Schematic diagram of the structure of the second conductive part provided by the present application;

[0054] Figure 10 Is Figure 9 Cross-sectional view of the conductive part in

[0055] Figure 11 Is Figure 9 Schematic diagram of the connection between the first pad of the conductive part in

[0056] Figure 12 Is Figure 11 Top view of

[0057] Figure 13 Is Figure 9 Schematic diagram of the connection between the second pad of the conductive part in

[0058] Figure 14 Is Figure 13 Top view of

[0059] Figure 15 Cross-sectional view of a sound generating device with a housing provided by the present application;

[0060] Figure 16 Cross-sectional view of a sound generating device without a housing provided by the present application.

[0061] Reference numerals:

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

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

[0064] 3. Magnetic circuit system; 31. Central magnet; 32. Central washer; 33. Edge magnet; 34. Edge 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 folding ring part; 412. First reinforcement part; 42. Second diaphragm; 421. Second connection area; 422. Inner folding ring; 423. Vibration part; 424. Outer folding ring; 43. First voice coil; 44. Second voice coil;

[0066] 5. Conductive member; 51. First pad; 52. Second pad; 53. Outer conductive portion;

[0067] 6. Housing; 61. Sound outlet hole; 62. Air vent hole; 63. Front cavity; 64. Rear cavity;

[0068] 7. Air flow channel. Detailed implementation manners

[0069] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application belong to the scope of protection of the present application.

[0070] The features of the terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the related objects before and after.

[0071] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0072] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0073] The following will be combined with Figures 1 - 15 Describe a sound generating device and an electronic device according to an embodiment of the present application.

[0074] As Figures 1 to 3 shown, according to some embodiments of the present application, a sound generating device is provided, including: a housing 2, a magnetic circuit system 3, a vibration system 4, and a conductive member 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 member 5 is disposed in the housing 2. The conductive member 5 has a first pad 51, a second pad 52, and an outer conductive portion 53 that are 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 outer conductive portion 53 is exposed on the side surface of the housing and is electrically connected to an external circuit.

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

[0076] In the above embodiments of the present application, the present application provides a conductive member 5, 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 in-line end or the out-line end of the first voice coil 43 and the second voice coil 44, so that the first voice coil 43 and the second voice coil 44 can be electrically connected to the positive or negative pole of the external circuit through the shared outer conductive portion 53. Compared with the traditional dual voice coil sound generating device that requires two sets of conductive members to respectively connect two voice coils and an external circuit, that is, there are four external connection pads electrically connected to the external circuit, the present application reduces the number of outer conductive portions 53 by optimizing the structure of the conductive member 5, and realizes the purpose of saving space by integrating the structure of the conductive member 5.

[0077] In addition, in the vibration direction of the vibration system 4, based on the fact that 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 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, which is beneficial to 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, avoiding the lead wires of the first voice coil 43 or the second voice coil 44 from being too long and interfering with other structures inside the sound generating device, and improving the reliability of the sound generating device. Among them, the first direction is the vibration direction of the vibration system 4, that is, the vibration direction of the voice coil / diaphragm. The outer conductive part 53 being 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 members 5 can be provided in the sound generating device, such as Figure 7 , Figure 8 , Figures 11 to 14 shown. Among them, the incoming line end and the outgoing line end of the first voice coil 43 can be respectively connected to the two first pads 51 of the two conductive members 5, and the incoming line end and the outgoing line end of the second voice coil 44 can be respectively connected to the two second pads 52 of the two conductive members 5. Finally, the two outer conductive parts 53 on the two conductive members 5 are respectively connected to the positive and negative electrodes of the external circuit, greatly reducing the number of the outer conductive parts 53, saving the assembly space of the sound generating device, and being beneficial to the miniaturized design of the product.

[0079] In the above embodiment, the two outer conductive parts 53 can be led out to the side wall of the housing 2 in the form of Pin pins, and can be specifically designed according to the specific assembly requirements of the product, and the present application does not limit this. Among them, the positions of the first pad 51 and the second pad 52 in the first direction can be set relatively or can be staggered from each other, and when there are two conductive members 5, the structures of the two conductive members 5 can be the same or different. In addition, the specific structure of the conductive member 5 can be designed in a matching manner according to the structural characteristics inside the sound generating device, and the conductive member 5 can be fixed on the housing 2 by means of bonding, injection molding, etc.

[0080] In the above embodiment, there is a first extension part extending along the first direction and a second extension part extending along the second direction between the first pad 51 and the outer conductive part 53, or between the second pad 52 and the first pad 51, or between the second pad 52 and the outer conductive part 53, and the second direction is perpendicular to the first direction. Thus, the first pad 51 and the second pad 52 are respectively located on opposite sides of the magnetic circuit system 3, and can be electrically connected to the external circuit through the outer conductive part 53.

[0081] Optionally, as Figures 1 to 14As shown, two conductive members 5 are provided. The incoming wire end and the outgoing wire end of the first voice coil 43 are respectively connected to the first pads 51 of the two conductive members, and the incoming wire end and the outgoing wire end of the second voice coil 44 are respectively connected to the second pads 52 of the two conductive members. The outer conductive parts 53 of the two conductive members are arranged adjacent to each other.

[0082] Optionally, the conductive member 5 is a metal member. The conductive member 5 is injection-molded in the housing 2, and partial regions of the metal member are exposed on the surface of the housing 2 to form the first pad 51, the second pad 52, and the outer conductive part 53.

[0083] Specifically, in practical applications, when two conductive members 5 are provided, the incoming wire end and the outgoing wire end of the first voice coil 43 can be respectively connected to the two first pads 51 of the two conductive members 5, and the incoming wire end and the outgoing wire end of the second voice coil 44 can be respectively connected to the two second pads 52 of the two conductive members 5, so that the conductive member 5 is electrically connected to the first voice coil 43 and the second voice coil 44 at the same time. The outer conductive parts 53 exposed on the surface of the housing 2 can be reduced to two, greatly reducing the occupied space of the outer conductive parts 53 for the whole machine. In addition, the outer conductive parts 53 of the two conductive members 5 are arranged adjacent to each other on the surface of the housing 2, which can further reduce the occupied space of the outer conductive parts 53 and is convenient for electrical connection with an external circuit.

[0084] In the above embodiment, the conductive member 5 can be designed as a metal member and embedded in the housing 2 by injection molding, and the first pad 51, the second pad 52, and the outer conductive part 53 are formed by partial regions of the metal member exposing the surface of the housing 2. At this time, the two outer conductive parts 53 can be led out to the side wall of the housing 2 in the form of Pin pins, which is convenient for further plugging or welding with an external wiring terminal. On the one hand, this embodiment saves the occupied space of the conductive member 5, on the other hand, it improves the connection stability between the conductive member 5 and the housing 2, and can also insulate the conductive member 5 from other structures to avoid affecting the overall performance of the sound generating device. In practical applications, the injection molding process can also improve the assembly efficiency of the product.

[0085] Optionally, as Figures 4 to 14 shown, two conductive members 5 are provided, and the two outer conductive parts 53 of the two conductive members 5 are arranged adjacent to each other. Further, the first pad 51 and the second pad 52 and the two outer conductive parts 53 are all located on the same side of the housing 2, 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 outer conductive parts 53, and the other is located on the opposite side of the housing 2 from the two outer conductive parts 53.

[0086] Specifically, as Figures 4 to 8As shown, in this embodiment, the first pads 51 and the second pads 52 of the two conductive members 5 and the two outer conductive portions 53 are all located on the same side of the housing 2. On the one hand, it is convenient for the first voice coil 43 and the second voice coil 44 to be respectively connected to the conductive member 5. On the other hand, the size of the conductive member 5 is reduced, and further the occupied space of the conductive member 5 is reduced.

[0087] More specifically, in this embodiment, the first pads 51 and the second pads 52 are both arranged adjacent to the outer conductive portions 53.

[0088] In another embodiment, as Figures 9 to 14 shown, one of the first pad 51 and the second pad 52 and the two outer conductive portions 53 are located on the same side of the housing 2, and the other is located on the side of the housing 2 opposite to the two outer conductive portions 53, so that the in-line ends and the out-line ends of the first voice coil 43 and the second voice coil 44 can be respectively led out to the opposite sides of the housing 2, avoiding the mutual interference of 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, as Figures 4 to 8 shown, when the first pads 51 and the second pads 52 and the two outer conductive portions 53 are all located on the same side of the housing 2, the first pad 51 and the second pad 52 are at least partially opposite in the first direction; as Figures 9 to 14 shown, one of the first pad 51 and the second pad 52 and the two outer conductive portions 53 are located on the same side of the housing 2, and the other is located on the side of the housing 2 opposite to the two outer conductive portions 53. The conductive member 5 extends from one side of the housing 2 along the outer peripheral edge of the housing 2 to the other side. The outer conductive portion 53 and the second pad 52 are respectively located at both ends of the conductive member 5, and the first pad 51 is located between the outer conductive portion 53 and the second pad 52.

[0090] Specifically, in this embodiment, when the first pads 51 and the second pads 52 and the two outer conductive portions 53 are all located on the same side of the housing 2, the first pad 51 and the second pad 52 are at least partially opposite 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 not only saves the occupied space of the conductive member 5, but also 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] Further, the conductive member 5 further includes a first connecting arm extending from one end of the outer conductive portion 53 in the first direction and a second connecting arm extending in the second direction. The second direction is 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 member 5 further includes a support arm bent and extending from the end of the first pad 51 away from the first connecting arm toward the second pad 52. With such a setting, the structure of the conductive member 5 can be made more compact and the reliability is higher.

[0092] Specifically, in this embodiment, when one of the first pad 51 and the second pad 52 is on the same side of the housing 2 as the two outer conductive parts 53, and the other is on the opposite side of the housing 2 from the two outer conductive parts 53, the conductive member 5 is designed to extend from one side of the housing 2 along the outer peripheral edge of the housing 2 to the opposite side of the housing 2. The outer conductive part 53 and the second pad 52 are respectively located at both ends of the conductive member 5, and the first pad 51 is located between the outer conductive part 53 and the second pad 52. This can adapt to 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 the present application does not limit this.

[0093] Optionally, as Figure 6 and Figure 10 shown, the housing 2 includes an upper housing 21 and a lower housing 22 connected to each other in the first direction, and the conductive member 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. On the one hand, it is convenient for the assembly of the entire sound generating device. On the other hand, in some embodiments, a second leakage hole 23 communicating with opposite sides of the magnetic circuit system 3 is further provided on the side wall of the housing 2 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 pad 51, the second pad 52, and the outer conductive part 53 are exposed on the surface of the upper housing 21 or the surface of the lower housing 22.

[0095] Optionally, as Figure 6 and Figure 10 shown, the housing 2 includes an upper housing 21 and a lower housing 22 connected to each other in the first direction, the conductive member 5 is disposed on the upper housing 21 or the lower housing 22, the outer peripheral edge of the first diaphragm 41 is connected to the upper housing 21 and forms a first connection area, and the outer peripheral edge 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 and the first connection area or the second connection area 421 are at least partially opposite.

[0096] Optionally, the upper housing 21 or the lower housing 22 or the position between the upper housing 21 and the lower housing 22 corresponding to the first pad 51 or the second pad 52 has an accommodation gap 221.

[0097] ​Specifically, in this embodiment, the outer peripheral edge of the first diaphragm 41 is connected to the upper housing 21, and the area where the first diaphragm 41 and the upper housing 21 are connected forms a first connection area. The outer peripheral edge of the second diaphragm 42 is connected to the lower housing 22, that is, the area formed by the connection of the second diaphragm 42 and the lower housing 22 is the second connection area 421. In the first direction, at least a part of the first pad 51 is disposed opposite to the first connection area, and at least a part of the second pad 52 is disposed opposite to the second connection area 421.

[0098] In the above embodiment, at least a part of the first pad 51 is disposed opposite to the first connection area, which means that the projection of the first pad 51 in the first direction can completely fall within the first connection area or partially fall within the first connection area; at least a part of the second pad 52 is disposed opposite to the second connection area 421, which means that the projection of the second pad 52 in the first direction can completely fall within the second connection area 421 or partially fall within the second connection area 421. Specifically, it is designed according to the specific structure of the housing 2, the internal space of the housing 2, etc. The present application does not limit this.

[0099] When the above-mentioned first pad 51 is disposed opposite to at least a part of the first connection area and the second pad 52 is disposed opposite to at least a part of the second connection area 421, the conductive member 5 can be designed as close to the edge of the housing 2 as possible, reducing the occupation of the internal space of the housing 2, maximizing the internal space of the housing 2, and at the same time facilitating the maximized design of the magnetic circuit system 3, the first diaphragm 41 and the second diaphragm 42 inside the housing 2.

[0100] In addition, in the above embodiment, a Z-direction accommodation gap 221 is provided at the positions of the housing 2 corresponding to the first pad 51 and the second pad 52, which can be used as the soldering point space reserved when the first voice coil 43 and the second voice coil 44 are respectively welded to the first pad 51 and the second pad 52, improving the rationality of the product structure design. Among them, the accommodation gap 221 can usually be located between the upper housing 21 and the lower housing 22, formed by the depression of one of the upper housing 21 and the lower housing 22, or provided on the lower housing 22 and formed by the depression of the lower housing 22, or provided on the upper housing 21 and formed by the depression of the upper housing 21. It is flexibly designed according to the specific setting positions of the first pad 51 and the second pad 52.

[0101] In some embodiments, the outer peripheral edges of the first diaphragm 41 and the second diaphragm 42 are both connected to the housing 2 by glue, and the first connection area and the second connection area 421 can generally be understood as glue application areas. Among them, the connection between the first diaphragm 41 and the upper housing 21, as well as the connection between the second diaphragm 42 and the lower housing 22, can be bonded by a positioning ring (steel ring).

[0102] Optionally, the magnetic circuit system 3 includes a central magnetic part, an edge magnetic part, and a magnetic yoke 35 connecting the central magnetic part and the edge magnetic part; a first magnetic gap 351 is formed between the central magnetic part and the magnetic yoke 35, and a second magnetic gap 352 is formed between the edge magnetic part and the magnetic yoke 35. The second magnetic gap 352 is disposed 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 generally includes a central magnet 31 and a central washer 32, and the edge magnetic part generally includes an edge magnet 33 and an edge washer 34. The magnetic yoke 35 is connected to connect the edge magnetic part and the central magnetic part to form the surrounding first magnetic gap 351 and second magnetic gap 352. This design can effectively utilize the inner space of the housing 2 and further realizes the miniaturization of the volume of the sound generating device. Among them, 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 to realize the sound generating performance of the sound generating device.

[0104] In the above embodiment, the first diaphragm 41 includes a first folding ring part 411 and a first reinforcing part 412. The first reinforcing part 412 is disposed at the center of the first folding ring part 411. The outer edge of the first folding ring part 411 is connected to the housing 2, and the first voice coil 43 is connected to the first reinforcing part 412. Among them, the first folding ring part 411 and the first reinforcing part 412 can be an integrally formed structure or a separately arranged structure, which is not limited herein. It can be understood that the first folding ring part 411 is a convex structure protruding upward or a concave structure recessed downward, which is not limited herein. Optionally, the first folding ring part 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 folding ring part and a second reinforcing part. The second reinforcing part is disposed at the center of the second folding ring part. The outer edge of the second folding ring part is connected to the housing 2, and the second voice coil 44 is connected to the second reinforcing part. Among them, the second folding ring part and the second reinforcing part can be an integrally formed structure or a separately arranged structure; the second folding ring part is a convex structure protruding upward or a concave structure recessed downward. Optionally, the second folding ring part protrudes in a direction away from the magnetic circuit system 3.

[0106] Optionally, as Figure 6 、 Figure 10 、 Figure 15 and Figure 16As shown, the outer peripheral edge of the first diaphragm 41 is connected to the housing 2, the outer peripheral edge of the second diaphragm 42 is connected to the housing 2, and the inner peripheral edge of the second diaphragm 42 is connected to the magnetic circuit system 3. There is an air flow channel 7 that runs through and communicates 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 air flow channel 7 and jointly radiate to the first side with the sound waves of the second diaphragm 42 facing the first side.

[0107] Specifically, in this embodiment, the sound waves of the first diaphragm 41 facing the first side are radiated outward through the air flow channel and jointly radiate to the first side with the sound waves of the second diaphragm 42 facing the first side, achieving the effect of the sound waves of the first diaphragm 41 and the second diaphragm 42 being superimposed and enhanced, and improving the high-frequency performance of the sound generating device. The setting of the air flow channel 7 facilitates the sound waves on the first side of the second diaphragm 42 to be radiated outward through this air flow channel. In this way, the sound waves on the first side of the first diaphragm 41 and the second diaphragm 42 are jointly radiated outward on the same side of the sound generating device, which is beneficial to the superposition of the air compressed when the first diaphragm 41 and the second diaphragm 42 vibrate, and improves the loudness and sensitivity of the sound generating device.

[0108] Optionally, as Figure 15 and Figure 16 shown, the magnetic circuit system 3 includes a central magnetic part, an edge magnetic part, and a magnetic yoke 35 connecting the central magnetic part and the edge magnetic part. The magnetic yoke 35 includes a top plate 353, a bottom plate 354, and side plates 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 plates 355. The edge magnetic part is connected to the bottom plate 354 and forms a second magnetic gap 352 with the side plates 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 air flow channel 7 sequentially passes through the central magnetic part, the top plate 353, and the second diaphragm 42.

[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 the installation stability. The side plate 355 of the magnetic yoke 35 is optionally disposed around the periphery of the top plate 353 and is arranged at an angle with the top plate 353. The side plate 355 and the top plate 353 enclose a receiving cavity, and the central magnetic part is disposed in the receiving cavity, connected to the top plate 353, and spaced from the side plate 355 to enclose a first magnetic gap 351. The bottom plate 354 is optionally connected to one end of the side plate 355 away from the top plate 353, extends in a direction away from the receiving cavity, and is arranged at an angle with the side plate 355. The edge magnetic part is disposed on the bottom plate 354 and is spaced from the side plate 355 to enclose a second magnetic gap 352, that is, the edge magnetic part and the central magnetic part are located on opposite sides of the side plate 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 vertically distributed 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, so as to ensure that the size of the magnetic circuit system 3 along the vibration direction of the vibration system 4 is not too large, thereby realizing a thin and light design.

[0111] Optionally, as Figure 15 and Figure 16 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. Among them, the support wall 356 is disposed on the side of the top plate 353 of the magnetic yoke 35 facing away from the central magnetic part and encloses an air flow channel 7 with the top plate 353.

[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 air flow channel 7 penetrates through the central magnetic part, the top plate 353, the support member, and the second diaphragm 42. Among them, the inner edge of the second diaphragm 42 is connected and fixed by the support member, and at the same time, the support member and the magnetic circuit system 3 enclose an air flow channel 7, liberating the design of the magnetic yoke 35, facilitating the modification of the magnetic yoke 35, and further optimizing the magnetic circuit system 3.

[0113] Optionally, as Figures 1 to 3 , and Figure 15 shown, the sound generating device further includes a cover body 1, the cover body 1 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 body 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, and the housing 2 is provided with a second leakage hole 23 communicating with the second cavity; the sound waves on the second side of the first diaphragm 41 and the second diaphragm 42 are respectively radiated outward through the first leakage hole 11 and the second leakage hole 23.

[0114] Specifically, in this embodiment, the cover 1 can, on the one hand, protect the first diaphragm 41, and on the other hand, a first cavity is formed between the cover 1 and the first diaphragm 41 to ensure the amplitude of the first diaphragm 41. It can be understood that by providing the first leakage hole 11 in the cover 1, the sound wave on the first side of the first diaphragm 41 can be conveniently radiated outward through the first leakage hole 11. In practical applications, a mesh cloth can also be provided at the center of the second diaphragm 42 to balance the air pressure on both sides thereof.

[0115] Optionally, as Figure 16 shown, the cover 1 is a metal part formed by processing a metal material, which is convenient for strongly supporting the sound generating device during the assembly process of the sound generating device and also reduces the occupation of the overall size of the machine. In specific applications, an appropriate number of first leakage holes 11 are set according to actual situations, and it is not limited to a fixed number. Preferably, a damping member or a breathable film, etc. is provided on the first leakage hole 11, which can further adjust the air flow velocity in the first cavity and adjust the acoustic resistance of the first cavity.

[0116] Optionally, as Figure 15 and Figure 16 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 in opposite phases. In this way, both the first side and the second side are in communication with the external environment, and the first side and the second side radiate sound waves with opposite phases to the external environment, and the sound waves on both sides cancel each other out in the far field, which is applicable to environments that require far-field noise cancellation 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 is in communication with the front cavity 63, and the second side of the first diaphragm 41 and the second diaphragm 42 is in communication with 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 in opposite phases.

[0118] Understandably, an electronic device usually has a sound outlet hole 61 through which the sound waves in the front cavity 63 radiate. When the electronic device is in use, the sound waves in the front cavity 63 can be radiated out through the sound outlet hole 61 and received by the user. Further, the sound waves in the rear cavity 64 can optionally be radiated out through the air vent hole 62. In this way, the sound waves in the front and rear cavities can form a sound dipole, achieving the technical effect of reducing sound leakage. Alternatively, the sound waves in the rear cavity 64 can be prevented from radiating outwards. The sound generating device of this application only serves to enhance the superposition of the sound waves on the first side of the first diaphragm 41 and the second diaphragm 42, improving the high-frequency performance. It can be selected according to the actual situation.

[0119] In one embodiment, the second diaphragm 42 includes an inner folding ring 422, a vibrating portion 423, and an outer folding ring 424 that are connected in sequence. The inner peripheral edge of the inner folding ring 422 is connected to the magnetic circuit system 3, the outer peripheral edge of the outer folding ring 424 is connected to the housing 2, and the second voice coil 44 is connected to the vibrating portion 423. Understandably, by setting the second diaphragm 42 as a double folding ring structure, it is convenient for the second voice coil 44 to drive the second diaphragm 42 to vibrate while improving the compliance of the second diaphragm 42 and enhancing its high-frequency performance. Among them, the inner folding ring 422, the vibrating portion 423, and the outer folding ring 424 of the second diaphragm 42 are an integrally formed structure, which can simplify the processing steps of the second diaphragm 42 and improve the structural strength of the second diaphragm 42.

[0120] In one embodiment, the first diaphragm 41 includes a first folding ring portion 411 and a first reinforcing portion 412. The first reinforcing portion 412 is provided at the center of the first folding ring portion 411. The outer edge of the first folding ring portion 411 is connected to the housing 2, and the first voice coil 43 is connected to the first reinforcing portion 412. Among them, the first folding ring portion 411 and the first reinforcing portion 412 can be an integrally formed structure or separately arranged, and the first folding ring portion 411 protrudes in a direction away from the magnetic circuit system 3. Understandably, the outer edge of the first folding ring portion 411 is connected to the housing 2, and the first voice coil 43 is connected to the first reinforcing portion 412. In this way, when the first voice coil 43 vibrates, it drives the first diaphragm 41 to vibrate, so that the sound waves of the first diaphragm 41 radiate outwards along the air flow channel 7.

[0121] Optionally, as Figure 15 and Figure 16 shown, an electronic device provided in this application includes a housing 6 and the sound generating device of the first aspect. The housing 6 has a receiving cavity. The sound generating device is disposed in the receiving cavity and divides the receiving cavity into an acoustically isolated front cavity 63 and a rear cavity 64. The first side communicates with the front cavity 63. Among them, the housing 6 is provided with a sound outlet hole 61 communicating with the front cavity 63. The sound waves of 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 hole 61.

[0122] Specifically, in this embodiment, the housing 6 can be an integrally formed structure or a split structure, which is not limited herein. Additionally, the outer contour of the housing 6 can be a square structure, or other suitable shapes such as a circular shape, and is not limited to a specific shape. The housing 6 is provided with a sound outlet hole 61 communicating with the front cavity 63, so that the sound waves on the first side of the first diaphragm 41 and the second diaphragm 42 of the sound generating device are radiated to the outside through the front cavity 63 and the sound outlet hole 61. Optionally, as Figure 15 and Figure 16 shown, the housing 6 is further provided with an air vent hole 62, and the air vent hole 62 communicates with the rear cavity 64; the first diaphragm 41 and the second diaphragm 42 radiate sound waves with a phase opposite to that of the sound waves in the front cavity 63 to the rear cavity 64, and the sound waves in the rear cavity 64 are radiated to the outside through the air vent hole 62. The air vent hole 62 can be selected as a round hole, an oval hole or a polygonal hole, etc., and the number of the air vent holes 62 can be one or more, which is specifically designed according to actual applications and is not limited herein.

[0123] According to a second aspect of the present application, there is provided an electronic device, including: the sound generating device of the first aspect.

[0124] Specifically, in this embodiment, when the sound generating device provided in the first aspect is applied to an electronic device, due to the small number of outer conductive parts 53 for connecting an external circuit, the occupation of its internal space is saved. Therefore, it is beneficial to the miniaturized design of the volume of the electronic product and simplifies the assembly process with the sound generating device. Among them, the electronic device can be a mobile phone, a tablet computer or other devices, and the present application does not limit this.

[0125] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

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

Claims

1. A sound generating device, characterized in that, Comprising: A housing; A magnetic circuit system connected to the housing; A vibration system including 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; A conductive member disposed on the housing, the conductive member having a first pad, a second pad, and an outer conductive portion that are electrically connected. 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 portion is exposed on the side surface of the housing and is electrically connected to an external circuit.

2. The sound generating device according to claim 1, wherein There are two conductive members. The incoming wire end and the outgoing wire end of the first voice coil are respectively connected to the first pads of the two conductive members, and the incoming wire end and the outgoing wire end of the second voice coil are respectively connected to the second pads of the two conductive members. The outer conductive portions of the two conductive members are arranged adjacent to each other; And / or, the conductive member is a metal member, the conductive member is injection-molded in the housing, and a partial area of the metal member is exposed on the surface of the housing to form the first pad, the second pad, and the outer conductive portion.

3. The sound generating device according to claim 1, wherein, There are two conductive members, and the two outer conductive portions of the two conductive members are arranged adjacent to each other; The first pad and the second pad and the two outer conductive portions are all located on the same side of the housing, or one of the first pad and the second pad is located on the same side of the housing as the two outer conductive portions, and the other is located on the side of the housing opposite to the two outer conductive portions.

4. The sound generating device according to claim 3, wherein, The first pad and the second pad are at least partially opposite to each other in the first direction; Or, the first pad and the second pad are at least partially opposite to each other in the first direction. The conductive member further includes a first connecting arm extending along the first direction from one end of the outer conductive portion 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, and the other end of the second connecting arm is connected to the second pad. The conductive member further includes a support arm bent and extending from the end of the first pad away from the first connecting arm towards the second pad; Or, the conductive member extends from one side of the housing along the periphery of the housing to the other side. The outer conductive portion and the second pad are respectively located at two ends of the conductive member, and the first pad is located between the outer conductive portion and the second pad.

5. The sound generating device according to claim 1, characterized in that, The housing includes an upper shell and a lower shell connected to each other along a first direction. The conductive member 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; In the first direction, the first pad or the second pad is at least partially opposite to the first connection region or the second connection region; And / or, there is an accommodation gap at a position corresponding to the first pad or the second pad between the upper shell or the lower shell or between the upper shell and the lower shell.

6. The sound generating device according to claim 1, wherein The magnetic circuit system includes a central magnetic part, an edge magnetic part, and a magnetic yoke connecting the central magnetic part and the edge magnetic part; A first magnetic gap is formed between the central magnetic part and the magnetic yoke, a second magnetic gap is formed between the edge 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; And / or, the first diaphragm includes 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 to the housing, and the first voice coil is connected to the first reinforcing part; And / or, the second diaphragm includes a second folding ring part and a second reinforcing part, the second reinforcing part is arranged at the center of the second folding ring part, the outer edge of the second folding ring part is connected to the housing, and the second voice coil is connected to the second reinforcing part.

7. The sound generating device according to claim 1, characterized in that, The outer peripheral edge of the first diaphragm is connected to the housing, the outer peripheral edge of the second diaphragm is connected to the housing, and the inner peripheral edge of the second diaphragm is connected to the magnetic circuit system. There is a through-flow air channel between 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. The sound wave of the first diaphragm facing the first side is radiated out through the air channel and jointly radiates to the first side with the sound wave of the second diaphragm facing the first side.

8. The sound generating device according to claim 7, wherein The magnetic circuit system includes a central magnetic part, an edge magnetic part, and a magnetic yoke connecting the central magnetic part and the edge magnetic part. The magnetic yoke includes a top plate, a bottom plate, and side plates connecting the top plate and the bottom plate. The bottom plate is connected to the housing; The central magnetic part is connected to the top plate and forms a first magnetic gap with the side plates, the edge magnetic part is connected to the bottom plate and forms a second magnetic gap with the side plates, 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 air channel sequentially penetrates through the central magnetic part, the top plate, and the second diaphragm.

9. The sound generating device according to 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, there is a support member between the top plate and the second diaphragm, the inner edge of the second diaphragm is connected to the support member, and the air channel penetrates through the central magnetic part, the top plate, the support member, and the second diaphragm.

10. The sound generating device according to claim 7, wherein, It further includes a cover body, the cover body is arranged on a side of the first diaphragm away from the second diaphragm and forms a first cavity with the first diaphragm, and the cover body has a first leakage hole communicating with the first cavity; A second cavity is formed among 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; Sound waves of the first diaphragm and the second diaphragm facing the second side are radiated outward through the first leakage hole and the second leakage hole respectively.

11. The sound generating device according to any one of claims 7-10, characterized in that, The first diaphragm and the second diaphragm vibrate in the same direction. The first sides of the first diaphragm and the second diaphragm radiate a first sound wave to the external environment, and the second sides of the first diaphragm and the second diaphragm radiate a second sound wave to the external environment. The first sound wave and the second sound wave are opposite in phase; 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 sides of the first diaphragm and the second diaphragm communicate with the front cavity, and the second sides of the first diaphragm and the second diaphragm communicate with the rear cavity. The first diaphragm and the second diaphragm vibrate in the same direction, radiate a first sound wave to the front cavity, and radiate a second sound wave to the rear cavity. The first sound wave and the second sound wave are opposite in phase; And / or, the second diaphragm includes an inner folding ring, a vibrating part and an outer folding ring connected in sequence. The inner peripheral edge of the inner folding ring is connected to the magnetic circuit system, the outer peripheral edge of the outer folding ring is connected to the housing, and the second voice coil is connected to the vibrating part; And / or, the first diaphragm includes 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 to the housing, and the first voice coil is connected to the first reinforcing part.

12. An electronic device, characterized in that, Comprising: The sound generating device according to any one of claims 1-ll.

13. An electronic device, characterized in that, Comprising: A housing and the sound generating device according to any one of claims 7-11. The housing 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. The first side communicates with the front cavity; Wherein, the housing is provided with a sound outlet hole communicating with the front cavity. Sound waves of 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.

14. The electronic device according to claim 13, characterized in that, The housing is further provided with an air vent hole, and the air vent hole communicates with the rear cavity; The first diaphragm and the second diaphragm radiate sound waves with a phase opposite to that of the sound waves in the front cavity to the rear cavity, and the sound waves in the rear cavity are radiated to the outside through the air vent hole.

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