Sound production device and electronic device

Abstract

The application discloses a sound generating device and electronic equipment, and relates to the technical field of loudspeakers. The sound generating device comprises a shell, a vibration assembly and a magnetic circuit assembly. The vibration membrane assembly comprises a first vibration membrane, a separation vibration membrane and a second vibration membrane which are arranged at intervals along a first direction. A voice coil is connected to the second vibration membrane. A connecting portion is arranged between the first vibration membrane and the second vibration membrane. The connecting portion abuts against the separation vibration membrane, so that a first rear cavity is defined between the first vibration membrane and the separation vibration membrane, a first front cavity is defined between the second vibration membrane and the separation vibration membrane, and a second rear cavity is defined between the magnetic circuit assembly and the second vibration membrane. The cavity walls of the first rear cavity and the second rear cavity are provided with rear cavity sound holes, and the cavity wall of the first front cavity is provided with a front cavity sound hole. The total equivalent radiation area is the superposition of the equivalent areas of the first vibration membrane and the second vibration membrane, which is beneficial to improving the sensitivity of the loudspeaker.

Description

Technical Field

[0001] This invention relates to the field of loudspeaker technology, and particularly to sound-generating devices and electronic devices. Background Technology

[0002] The effective sound-producing area of ​​conventional loudspeakers is usually limited by the product's external dimensions. Furthermore, due to the non-piston-like vibration of the diaphragm surround area, the actual effective area for pushing air typically cannot exceed the physical boundaries of the product's casing. As smart products continue to evolve towards thinner and lighter designs, their internal space is becoming increasingly compact, leaving very limited physical space for loudspeaker installation. This further restricts the increase in loudspeaker size and places higher demands on audio performance. Summary of the Invention

[0003] The main objective of this invention is to provide a sound-generating device and electronic device that significantly increases the effective sound-generating area of ​​a loudspeaker while maintaining good stability.

[0004] To achieve the above objectives, the present invention provides a sound-generating device for installation within the housing of an electronic device, the sound-generating device comprising: case; A vibrating assembly, connected to the housing, includes a diaphragm assembly and a voice coil. The diaphragm assembly includes a first diaphragm, an isolation diaphragm, and a second diaphragm spaced apart along a first direction. The voice coil is connected to the second diaphragm. A connecting portion is provided between the first diaphragm and the second diaphragm, and the connecting portion abuts against the isolation diaphragm, thereby defining a first rear cavity between the first diaphragm and the isolation diaphragm, and defining a first front cavity between the second diaphragm and the isolation diaphragm. A magnetic circuit assembly is connected to the housing. The magnetic circuit assembly is located on the side of the second diaphragm away from the first diaphragm. The magnetic circuit assembly has a magnetic gap for housing the voice coil. A second rear cavity is defined between the magnetic circuit assembly and the second diaphragm. The walls of the first and second rear cavities are provided with rear cavity acoustic holes, and the walls of the first front cavity are provided with front cavity acoustic holes.

[0005] In one embodiment, both the first diaphragm and the second diaphragm include a vibrating plate and a pleated ring disposed around the periphery of the vibrating plate, wherein, The middle portion of the vibrating plate of the second diaphragm protrudes towards the direction of the first diaphragm to form the connecting portion, and the inner side of the isolation diaphragm is sandwiched between the connecting portion and the first diaphragm; or, the middle portion of the vibrating plate of the first diaphragm protrudes towards the direction of the second diaphragm to form the connecting portion, and the inner side of the isolation diaphragm is sandwiched between the connecting portion and the second diaphragm; or, the middle portions of the vibrating plates of the first diaphragm and the vibrating plates of the second diaphragm both protrude towards each other to form two connecting portions, and the two connecting portions respectively abut against the two opposite sides of the isolation diaphragm along the first direction.

[0006] In one embodiment, the connecting portion includes an inclined portion disposed at an angle to the first direction; and / or, Along the protruding direction of the connecting portion, the cross-sectional dimension of the connecting portion gradually decreases.

[0007] In one embodiment, the housing includes a housing body and an isolation plate connected to the inner wall of the housing body. The outer edge of the isolation diaphragm is connected to the isolation plate. The housing body has a first side end and a second side end disposed opposite to each other along a first direction. At least the first side end is open. The first diaphragm is disposed on the first side end. The magnetic circuit assembly is connected to the second side end.

[0008] In one embodiment, the edge of the partition plate is recessed to define an annular sealant region together with the shell body, the annular sealant region being used for injecting sealant to achieve a sealing connection between the partition plate and the shell body; and / or, The shell body is stepped, forming a first stepped surface facing the first side end within the inner cavity of the shell body; the second diaphragm is disposed within the shell, and the edge of the second diaphragm is in contact with the first stepped surface; and / or, The inner cavity of the shell body is provided with a protrusion at the corner, and multiple protrusions together form a second step surface. The edge of the isolation plate is in contact with the second step surface.

[0009] In one embodiment, the housing includes a first housing and a second housing stacked along a first direction. The first housing is open on one side away from the second housing, and a hollow area is formed in the middle of the other side of the first housing. The second housing is stepped to form a supporting surface facing the first housing. The first diaphragm is disposed on the open side of the first housing; The isolation diaphragm is connected to the other side of the first housing and is configured to cover the hollow area; The second diaphragm is connected to the second housing, and the edge of the second diaphragm is in contact with the supporting surface.

[0010] In one embodiment, the magnetic circuit assembly includes a magnetic yoke, a central magnetic part, a side magnetic part, a central magnetic guide plate, and a side magnetic guide plate. The central magnetic part is fixed between the magnetic yoke and the central magnetic guide plate, the side magnetic part is fixed between the magnetic yoke and the side magnetic guide plate, a magnetic gap is formed between the central magnetic guide plate and the side magnetic guide plate, and the side magnetic guide plate is connected to the housing.

[0011] In one embodiment, the housing is made of a magnetically conductive metal, and the side of the housing away from the first diaphragm is bent inward to form the side magnetic plate, which is connected to the side magnetic portion; and / or, The magnetic yoke has a stepped surface on the side facing away from the first diaphragm for use with the isolation mesh; and / or, The central magnetic part includes a central magnet, and the side magnetic part includes a plurality of side magnets arranged at intervals along the circumference of the central magnet. Among the plurality of side magnets, two first side magnets are respectively disposed on opposite sides of the central magnet along a second direction. Each first side magnet includes a first extension segment and a second extension segment. The first extension segment extends along a third direction, and the second extension segment connects to the middle of the first extension segment and extends along a second direction. The second direction and the third direction are two intersecting directions.

[0012] In one embodiment, the magnetic yoke has a bent portion that bends toward the side where the vibration assembly is located, the bent portion extending into the inner cavity of the housing and being positioned in conjunction with the inner surface of the housing.

[0013] In one embodiment, the housing has a perforated portion on the side away from the vibration component; The bent portion extends into the hollowed-out portion; The central magnetic part includes a central magnet, and the side magnetic part includes a plurality of side magnets arranged at intervals along the circumference of the central magnet. The two sides of the side magnets opposite each other along a first direction are attached to the housing and the magnetic yoke, and the side of the side magnets facing the hollow part is attached to the bent part.

[0014] In one embodiment, along the circumferential direction of the housing, a plurality of front cavity acoustic holes are provided on one side of the housing, and a plurality of rear cavity acoustic holes are provided on the remaining side of the housing.

[0015] In one embodiment, the sound-generating device further includes a housing, the housing including a main body and a sound-emitting part located on the side of the main body, the main body being disposed on one side of the sound-generating device, the main body being connected to the vibration assembly and forming a second front cavity between the main body and the first diaphragm, and the sound-emitting part communicating with the second front cavity and the sound hole of the front cavity.

[0016] The present invention also proposes an electronic device, including an electronic device housing and the aforementioned sound-generating device, wherein the sound-generating device comprises: case; A vibrating assembly, connected to the housing, includes a diaphragm assembly and a voice coil. The diaphragm assembly includes a first diaphragm, an isolation diaphragm, and a second diaphragm spaced apart along a first direction. The voice coil is connected to the second diaphragm. A connecting portion is provided between the first diaphragm and the second diaphragm, and the connecting portion abuts against the isolation diaphragm, thereby defining a first rear cavity between the first diaphragm and the isolation diaphragm, and defining a first front cavity between the second diaphragm and the isolation diaphragm. A magnetic circuit assembly, connected to the housing, is located on the side of the second diaphragm away from the first diaphragm. The magnetic circuit assembly has a magnetic gap for housing the voice coil. A second rear cavity is defined between the magnetic circuit assembly and the second diaphragm. The walls of the first and second rear cavities are provided with rear cavity acoustic holes, and the walls of the first front cavity are provided with front cavity acoustic holes. The electronic device housing has a receiving space and a sound outlet connecting the receiving space. The sound-emitting device is disposed in the receiving space. The first front cavity is connected to the external environment of the electronic device via a path including the front cavity sound outlet and the sound outlet. The first rear cavity and the second rear cavity are connected to the receiving space via the rear cavity sound outlet.

[0017] In the technical solution of this invention, a connecting portion is provided between the first diaphragm and the second diaphragm, which can abut against the isolation diaphragm, thereby realizing the connection between the first diaphragm, the isolation diaphragm, and the second diaphragm. Simultaneously, the isolation diaphragm can separate the space between the first diaphragm and the second diaphragm, forming a first front cavity and a first rear cavity, ensuring that they are not interconnected. The voice coil moves along a first direction under the action of the magnetic circuit assembly, driving the first diaphragm and the second diaphragm to vibrate simultaneously. During this process, the isolation diaphragm vibrates synchronously with the first and second diaphragms, ultimately achieving a larger effective diaphragm area within a limited volume. In this structure, the total equivalent radiation area is the sum of the equivalent areas of the first diaphragm and the second diaphragm, which is beneficial for improving the speaker's sensitivity. By setting a flexible isolation diaphragm to achieve the separation between the first front cavity and the first rear cavity, the isolation diaphragm is more easily stretched and deformed when abutted by the connecting portion, thus possessing good adaptability and sealing performance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 An exploded view of an embodiment of the sound-generating device provided by the present invention; Figure 2 for Figure 1 A partial cross-sectional schematic diagram of the vibration assembly; Figure 3 for Figure 1 A cross-sectional schematic diagram of the sound-generating device; Figure 4 for Figure 1 A cross-sectional schematic diagram of the engagement of the vibration assembly and the magnetic circuit assembly; Figure 5 for Figure 1 A bottom-view diagram of the sound-generating device; Figure 6 for Figure 1 Exploded view of the central magnetic circuit assembly; Figure 7 for Figure 1 A cross-sectional schematic diagram showing the fit between the sound-generating device and the outer casing; Figure 8 for Figure 1 A schematic diagram of another embodiment of the housing.

[0020] Explanation of icon numbers: 100. Sound-generating device; 1. Housing; 11. Front cavity sound hole; 12. Rear cavity sound hole; 13. First stepped surface; 14. Second stepped surface; 15. First housing; 16. Second housing; 17. Annular protrusion; 2. Vibration assembly; 21. First diaphragm; 22. Second diaphragm; 23. Isolation diaphragm; 232. Isolation plate; 2320. Annular rubber area; 24. Voice coil; 20. Connecting part; 211. Vibrating plate; 212. Folded ring; 3. Magnetic circuit assembly; 31. Magnetic yoke; 311. Bending section; 32. Central magnetic section; 33. Side magnetic section; 331. First extension section; 332. Second extension section; 34. Central magnetic guide plate; 35. Side magnetic guide plate; 36. Support plate; 101. First front cavity; 102. First rear cavity; 103. Second rear cavity; 104. Second front cavity; 200. Outer shell; 201. Main body; 202. Sound output section.

[0021] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0024] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0025] The effective sound-producing area of ​​conventional loudspeakers is usually limited by the product's external dimensions. Furthermore, due to the non-piston-like vibration of the diaphragm surround area, the actual effective area for pushing air typically cannot exceed the physical boundaries of the product's casing. As smart products continue to evolve towards thinner and lighter designs, their internal space is becoming increasingly compact, leaving very limited physical space for loudspeaker installation. This further restricts the increase in loudspeaker size and places higher demands on audio performance.

[0026] This invention proposes a sound-generating device that drives the synchronous vibration of two diaphragms through a single-sided voice coil, thereby significantly increasing the effective sound-generating area of ​​the loudspeaker. By designing the connection method of the two diaphragms, the assembly process is simplified and the structural stability is increased.

[0027] It should be noted that the first direction, second direction, and third direction shown in this invention, depending on the different usage states and placement positions of the product, can correspond to the up-down direction, the front-back direction, and the left-right direction. In this embodiment, the first direction corresponds to the height direction of the sound-emitting device, the second direction corresponds to the width direction of the sound-emitting device, and the third direction corresponds to the length direction of the sound-emitting device.

[0028] Please refer to Figures 1 to 3The sound-generating device 100 includes a housing 1, a vibration assembly 2, and a magnetic circuit assembly 3. The vibration assembly 2 is connected to the housing 1 and includes a diaphragm assembly and a voice coil 24. The diaphragm assembly includes a first diaphragm 21, an isolation diaphragm 23, and a second diaphragm 22 spaced apart along a first direction. The voice coil 24 is connected to the second diaphragm 22. A connecting portion 20 is provided between the first diaphragm 21 and the second diaphragm 22, and the connecting portion 20 abuts against the isolation diaphragm 23 so that the first diaphragm 21 and the isolation diaphragm 23... A first rear cavity 102 is defined between the second diaphragm 22 and the isolation diaphragm 23, and a first front cavity 101 is defined between the second diaphragm 22 and the isolation diaphragm 23. The magnetic circuit assembly 3 is located on the side of the second diaphragm 22 away from the first diaphragm 21. The magnetic circuit assembly 3 has a magnetic gap for housing the voice coil 24. A second rear cavity 103 is defined between the magnetic circuit assembly 3 and the second diaphragm 22. The walls of the first rear cavity 102 and the second rear cavity 103 are provided with rear cavity sound holes 12, and the walls of the first front cavity 101 are provided with front cavity sound holes 11.

[0029] In the technical solution of this invention, a connecting portion 20 is provided between the first diaphragm 21 and the second diaphragm 22, connecting the two. The connecting portion 20 can abut against the isolation diaphragm 23, thereby realizing the connection between the first diaphragm 21, the isolation diaphragm 23, and the second diaphragm 22. At the same time, the isolation diaphragm 23 can separate the space between the first diaphragm 21 and the second diaphragm 22 to form a first front cavity 101 and a first rear cavity 102, ensuring that the two are not interconnected. The voice coil 24 moves along the first direction under the action of the magnetic circuit assembly 3, which can drive the first diaphragm 21 and the second diaphragm 22 to vibrate simultaneously. During this process, the isolation diaphragm 23 vibrates synchronously with the first diaphragm 21 and the second diaphragm 22, ultimately achieving a larger effective diaphragm area within a limited volume. In this structure, the total equivalent radiation area is the superposition of the equivalent areas of the first diaphragm 21 and the second diaphragm 22, which is beneficial to improving the sensitivity of the loudspeaker. The first front cavity 101 and the first rear cavity 102 are separated by setting a flexible isolation diaphragm 23. The isolation diaphragm 23 is easier to stretch and deform when it is held by the connecting part 20, thus having good adaptability and sealing performance.

[0030] It should be understood that the isolation diaphragm 23 is bonded to the first diaphragm 21 and the second diaphragm 22, thereby isolating the first front cavity 101 and the first rear cavity 102, while ensuring synchronous vibration of the three. The connecting part 20 is located in the middle of the corresponding diaphragm, thereby ensuring the uniformity of vibration transmission and avoiding polarization. Accordingly, the first front cavity 101 and the first rear cavity 102 are both arranged in a ring.

[0031] The present invention does not limit the structural form of the connecting part 20. A transmission component can be added to connect the first diaphragm 21 and the second diaphragm 22 to achieve the connection between the two. The transmission component abuts against the isolation diaphragm 23.

[0032] In this embodiment, both the first diaphragm 21 and the second diaphragm 22 include a vibrating plate and a folded ring 212 disposed around the vibrating plate 211. The vibrating plate 211 has a certain rigidity, and the folded ring 212 is a flexible structure. The vibrating plate 211 is set to protrude from one of the first diaphragm 21 and the second diaphragm 22 to form a connecting part 20. This allows the connection of the two diaphragms and the synchronization of their vibrations to be achieved without adding new components.

[0033] The connecting portion 20 is formed by protruding from the vibrating plate 211 of the first diaphragm 21 or the second diaphragm 22. Therefore, the connecting portion 20 should be a thin-walled structure. The end face of the connecting portion 20, which is arranged along the first direction, abuts against the isolation diaphragm 23. Therefore, the shape of the connecting portion 20 should be reasonably designed to ensure an effective contact area. In this embodiment, the connecting portion 20 is U-shaped.

[0034] The present invention does not limit the location of the connecting portion 20. In some embodiments, the middle portion of the vibrating plate 211 of the second diaphragm 22 protrudes towards the first diaphragm 21 to form the connecting portion 20. Taking the first direction as the vertical direction as an example, in this case, the connecting portion 20 extends upward, and the upper end surface of the connecting portion 20 abuts against the middle portion of the isolation diaphragm 23 and the first diaphragm 21. Providing the connecting portion 20 on the second diaphragm 22 is beneficial for maintaining structural strength and vibration transmission stability. At this time, the inner side of the isolation diaphragm 23 is sandwiched between the connecting portion 20 and the first diaphragm 21, which is beneficial for improving the connection stability of the isolation diaphragm 23.

[0035] In some embodiments, the middle portion of the vibrating plate 211 of the first diaphragm 21 protrudes towards the second diaphragm 22 to form a connecting portion 20. Taking the first direction as the vertical direction as an example, the connecting portion 20 extends downward, and its lower end face abuts against the middle portion of the isolation diaphragm 23 and the second diaphragm 22. At this time, the inner side of the isolation diaphragm 23 is sandwiched between the connecting portion 20 and the second diaphragm 22, which helps to improve the connection stability of the isolation diaphragm 23. It should be understood that the force on both sides of the first diaphragm 21 along the first direction is uneven; therefore, the structure of the first diaphragm 21 has higher requirements.

[0036] In some embodiments, the diaphragms 211 of the first diaphragm 21 and the second diaphragm 22 are each provided with a connecting portion 20 on one side facing each other, and the two connecting portions 20 respectively abut against the opposite sides of the isolation diaphragm 23 along the first direction. At this time, the two connecting portions 20 are connected to the isolation diaphragm 23 together, and the volume difference between the first front cavity 101 and the second front cavity 104 in this structure is smaller, reducing the sound propagation time difference and timbre difference caused by the difference in cavity volume. Furthermore, along the protruding direction of the connecting portion 20, the vibrating plate 211 is arranged in a stepped manner. Figure 4In this embodiment, the vibrating plate 211 of the second diaphragm 22 is generally stepped, and the width of the steps gradually decreases towards the first diaphragm 21. This arrangement can improve the structural strength, reduce stress concentration, and improve the overall stability and reliability of the diaphragm. On the other hand, this stepped arrangement and inclined segment connection can optimize the vibration propagation path.

[0037] In some embodiments, the cross-sectional dimensions of the connecting portion 20 gradually decrease along the protruding direction of the connecting portion 20. This configuration improves the structural strength of the vibrating plate 211 and avoids excessively large stamping deformation areas on the vibrating plate 211, which could cause manufacturing difficulties. In this embodiment, the cross-sectional width of the connecting portion 20 first gradually decreases and then becomes uniform, thereby adapting to the height distance between the first diaphragm 21 and the second diaphragm 22 while ensuring an effective contact area at the connection.

[0038] In some embodiments, the connecting portion 20 includes an inclined portion that is angled to the first direction. The inclined portion is beneficial to improving the structural strength and enhancing the vibration stability of the connecting portion 20.

[0039] When the isolation diaphragm 23 is engaged with the connecting part 20, it adaptively deforms under the tension of the connecting part 20, thereby achieving a fitting effect. In some embodiments, the shape of the isolation diaphragm 23 may also be adapted to the connecting part 20, with a corresponding concave-convex shape, so as to ensure an effective contact area between the two when engaged with the connecting part 20, reduce the tensile deformation of the isolation diaphragm 23, and improve durability.

[0040] To facilitate the connection between the isolation diaphragm 23 and the housing 1, the housing 1 includes a housing body and an isolation plate 232 connected to the inner wall of the housing body. The outer edge of the isolation diaphragm 23 is connected to the isolation plate 232. The housing body has a first side end and a second side end arranged opposite to each other along a first direction, with at least the first side end being open. The first diaphragm 21 is covered on the first side end, and the magnetic circuit assembly 3 is connected to the second side end. The magnetic circuit assembly 3 is located on the outside of the housing body. The housing body can be positioned and installed using the end face of the second end. The housing body's shape design allows for the positioning and installation of related components, resulting in a compact overall structure. The isolation plate 232 can be made of metal or high-rigidity plastic, etc. The isolation plate 232 should have sufficient rigidity to prevent self-vibration or to orient its vibration mode towards high frequencies, avoiding audible audio frequencies.

[0041] Based on the above embodiments, the edge of the isolation plate 232 should be in a sealed fit with the shell body. Considering that the isolation plate 232 is relatively thin and the effective connection area of ​​the peripheral adhesive is small, sealing failure is likely to occur during the vibration of the isolation plate 232. Therefore, please refer to... Figure 1 and Figure 4The edge of the separator 232 is recessed to define an annular sealant region 2320 together with the shell body. Sealant is injected into the annular sealant region 2320 to achieve a sealed connection between the separator 232 and the shell body. Specifically, the edge thickness of the separator 232 can be reduced to form a recess, while the annular sealant region 2320 is an open area. The width and depth of the recessed portion are mainly used to accommodate the sealant, improving the adhesion between the separator 232 and the shell body. In this embodiment, the overall thickness of the separator 232 is relatively uniform, and its edges are bent to create a recessed effect within the plane.

[0042] Furthermore, an annular rubber region 2320 is formed on the side of the isolation plate 232 facing the first diaphragm 21.

[0043] Considering the installation and positioning of the isolation plate 232, a protrusion is provided at the corner of the inner cavity of the shell body. Multiple protrusions together form a second stepped surface 14, and the edge of the isolation diaphragm 23 is in contact with the second stepped surface 14. The edge of the isolation plate 232 overlaps with the second stepped surface 14, which can achieve the initial positioning of the isolation plate 232 within the shell body, ensuring the accuracy of its installation position. Moreover, this contact method can also enhance the connection stability between the isolation plate 232 and the shell body to a certain extent. At the same time, in order to further improve the sealing performance and connection strength between the isolation plate 232 and the shell body, an appropriate amount of sealant can be applied to the part where the isolation plate 232 is in contact with the second stepped surface 14, so that the two are connected more tightly.

[0044] The middle part of the isolation diaphragm 23 is bonded and fixed to the connecting part 20, and the edge of the isolation diaphragm 23 is bonded to the isolation plate 232, thereby ensuring the sealing and isolation of the cavity and the effect of synchronous vibration with the diaphragms on both sides.

[0045] It should be understood that, in order to avoid mutual interference between the airflow of the first front cavity 101 and the first rear cavity 102 and the second rear cavity 103, the front cavity acoustic port 11 and the rear cavity acoustic port 12 are preferably staggered. Please refer to... Figure 1 Along the circumference of the housing 1, multiple front cavity acoustic holes 11 are provided on one side of the housing 1, and multiple rear cavity acoustic holes 12 are provided on the remaining sides of the housing 1. When the housing 1 is square, the housing 1 has four sides, one side of which has multiple front cavity acoustic holes 11 arranged in a straight line, and the remaining three sides each have multiple rear cavity acoustic holes 12. This can isolate the sound waves radiated from the front and rear cavities, improving the sound production performance of the sound-generating device. The multiple rear cavity acoustic holes 12 on each side are arranged in a straight line.

[0046] It should be understood that the number of front cavity acoustic holes 11 and rear cavity acoustic holes 12 may be different on two adjacent sides.

[0047] In this embodiment, the shell body is stepped, forming a first stepped surface 13 facing the first side end within the inner cavity of the shell body; the first diaphragm 21 is covered on the first side end; and the edge of the second diaphragm 22 is in contact with the first stepped surface 13; the first diaphragm 21 is connected to the first side end of the shell 1, thus having a defined installation position. The stepped arrangement of the shell body enables the formation of the first stepped surface 13 on its inner side for the second diaphragm 22 to overlap, facilitating the installation and positioning of the second diaphragm 22. It should be understood that the second diaphragm 22 should be bonded to the shell body.

[0048] Based on the above embodiments, when the second step surface 14 is formed inside the shell body, the second step surface 14 is preferably arranged around the outside of the first step surface 13 and located between the first step surface 13 and the first side end.

[0049] In practical applications, the size of the rear cavity acoustic port 12 needs to be determined according to the specific acoustic requirements of the sound-generating device 100. If the size is too small, it will affect the airflow efficiency, leading to a decrease in acoustic performance, such as a poor low-frequency response and unclear sound quality. If the size is too large, it may weaken the overall structural strength of the housing 1, making the sound-generating device 100 more susceptible to damage when subjected to external impact. Considering the change in the outer diameter of the housing 1 after the stepped arrangement, the distance between the second diaphragm 22 and the first side end is greater than the distance between the second diaphragm 22 and the second side end. The first side end is open, while the second side end also has a bottom surface. Therefore, the cavity wall height of the second rear cavity 103 is smaller. Please refer to... Figure 5 and Figure 6 The side of the housing 1 away from the first diaphragm 21 is partially hollowed out to form a rear cavity sound hole 12, thereby enabling the second rear cavity 103 to communicate with the rear sound cavity on the outer shell, ensuring air circulation, and thus ensuring the overall structural strength of the housing 1.

[0050] When the first diaphragm 21 mates with the housing 1, in order to improve the bonding and sealing effect between the two, please refer to... Figure 4 The first side of the housing body is open, and an annular protrusion 17 protrudes from the outer side of the first side. The first diaphragm 21 is covered on the first side, and the edge of the first diaphragm 21 covers the outside of the annular protrusion 17. This arrangement allows for simultaneous application of adhesive to both the end face and the side face of the housing body, thereby increasing the connection strength between it and the first diaphragm 21. The annular protrusion 17 also forms a physical limiting structure, and further improves the sealing performance by increasing the contact area and mechanical interlocking force. In addition, the fit between the edge of the first diaphragm 21 and the annular protrusion 17 is interference-fitted to ensure the stability of acoustic performance.

[0051] Please refer to Figure 8In another embodiment, to facilitate the positioning and connection of related components, the housing 1 includes a first housing 15 and a second housing 16 stacked along a first direction. The side of the first housing 15 away from the second housing 16 is open, and a hollow area is formed in the middle of the other side of the first housing 15. The second housing 16 is stepped to form a supporting surface facing the first housing 15. A first diaphragm 21 is covered on the open side of the first housing 15. An isolation diaphragm 23 is connected to the other side of the first housing 15 and covers the hollow area. A second diaphragm 22 is connected to the second housing 16, and the edge of the second diaphragm 22 is in contact with the supporting surface. In this case, the housing 1 is a split structure, formed by the mating of the first housing 15 and the second housing 16. The hollow area of ​​the first housing 15 provides space for the connection of the isolation diaphragm 23. At this time, the bottom surface of the first housing 15 facing away from its open side functions as an isolation plate 232. This provides better structural strength and serves to connect the isolation diaphragm and strengthen the structural strength. The maximum outer diameter of the second housing 16 should be flush with the maximum outer diameter of the first housing 15.

[0052] The aforementioned supporting surface has the same function as the first step surface.

[0053] Please refer to Figure 6 The magnetic circuit assembly 3 includes a yoke 31, a central magnetic part 32, a side magnetic part 33, a central magnetic guide plate 34, and a side magnetic guide plate 35. The central magnetic part 32 is fixed between the yoke 31 and the central magnetic guide plate, and the side magnetic part 33 is fixed between the yoke 31 and the side magnetic guide plate. A magnetic gap is formed between the central magnetic guide plate and the side magnetic guide plate, and the side magnetic guide plate is connected to the housing 1. Simultaneously, a support plate 36 is provided to center the voice coil 24 and provide electrical conductivity.

[0054] In this embodiment, the central magnetic part 32 includes a central magnet, and the side magnetic part 33 includes four side magnets arranged around the central magnet, thereby forming an annular magnetic gap for a single voice coil 24 to be placed.

[0055] Furthermore, the housing 1 and the side magnetic plate 35 are integrally formed; this integrates the side magnetic plate 35 with the housing 1, thereby reducing the number of assembly parts. This design also makes it easier to improve the strength of the structure, reduce the overall height of the structure, and adapt to smaller installation spaces. In some embodiments, the magnetic yoke 31 is stepped on the side away from the first diaphragm 21 to cooperate with the isolation mesh, which can cover the open area on the housing 1, thereby improving the protective performance of the internal structure. It should be understood that the specific shape of the magnetic yoke 31 should be reasonably adapted according to the open area of ​​the housing 1 to avoid obstructing the open area.

[0056] To enhance the effect of the voice coil 24 in cutting the magnetic field, the central magnetic part 32 includes a central magnet, and the side magnetic part 33 includes multiple side magnets arranged at intervals along the circumference of the central magnet. Among the multiple side magnets, two first side magnets are respectively located on opposite sides of the central magnet along a second direction. Each first side magnet includes a first extension segment 331 and a second extension segment 332. The first extension segment 331 extends along a third direction, and the second extension segment 332 connects to the middle of the first extension segment 331 and extends along the second direction. The second direction and the third direction are two intersecting directions. That is, both first side magnets are T-shaped, providing more magnetic lines of force to the voice coil 24 during its movement, thereby greatly enhancing the effect of the voice coil 24 in cutting the magnetic field.

[0057] Accordingly, based on the structure of the first side magnet, the yoke 31 should be provided with a corresponding positioning structure to facilitate the installation and positioning of the first side magnet. Specifically, the yoke 31 is partially folded to form a flange, and each first side magnet is positioned on the yoke 31 by two flanges that are opposite each other along the third direction. The second extension 332 is located between the two flanges, and the first extension 331 abuts against the side of the two flanges along the second direction.

[0058] Furthermore, the magnetic yoke 31 has a bent portion 311 extending towards the side where the vibration assembly 2 is located. The bent portion 311 extends into the inner cavity of the housing 1 and is positioned in conjunction with the inner surface of the housing 1. This achieves the connection between the magnetic yoke 31 and the housing 1. The provision of the bent portion 311 is beneficial for controlling the concentricity of the magnetic circuit assembly and the voice coil 24.

[0059] Specifically, a hollow portion is provided on the side of the housing 1 away from the vibration component; a bent portion 311 extends into the hollow portion and fits against the inner surface of the hollow portion; the two opposite sides of the side magnet along the first direction fit against the housing 1 and the magnetic yoke 31, and the side of the side magnet facing the hollow portion fits against the bent portion 311. At this time, the bent portion 311 not only serves to connect the housing 1, but also serves to position the side magnet.

[0060] In other embodiments, two voice coils 24 can be arranged to vibrate synchronously and be connected to the second diaphragm 22. In this case, the central magnetic part 32 includes a first central magnet and two second central magnets spaced apart along the second direction, and the side magnetic part 33 includes two side magnets, which are respectively disposed on both sides of the two second central magnets to form two spaced magnetic gaps together with the first central magnet and the two second central magnets. Each voice coil 24 is correspondingly arranged with one magnetic gap. The two voice coils 24 are arranged in parallel or in series and share a magnetic circuit assembly 3, thereby increasing the driving force output.

[0061] It should be understood that a portion of the diaphragm 22's vibrating plate 211 protrudes towards the voice coil 24 to form a convex portion, and all voice coils 24 are connected to the convex portion. This ensures a tight connection between the two voice coils 24 and the vibrating plate 211, while also adapting to the height position of the voice coils 24. When the vibrating plate 211 is set as a step, one of the steps serves as a convex portion.

[0062] Generally speaking, the larger the size of the sound-generating device, the more air it can move, resulting in a lower frequency and fuller sound. In common loudspeakers, the sound-generating device is usually located inside the outer casing, forming a front and rear cavity with the casing. Therefore, if the height of the sound-generating device is increased, the height of the outer casing needs to be increased accordingly. In this embodiment, the sound-generating device also includes an outer casing 200, which includes a main body 201 and a sound-emitting part 202 located on the side of the main body 201. The main body 201 is located on one side of the sound-generating device, and is connected to the vibration component 2 and forms a second front cavity 104 between the main body 201 and the first diaphragm 21. The sound-emitting part 202 connects the second front cavity 104 and the front cavity sound hole 11. The outer casing 200, as a module housing, can be installed as a whole component into the housing of the electronic device after being assembled with the sound-generating device. The main body 201 and the sound output part 202 together form the front shell, which serves as a semi-module structure. On the one hand, it reduces the overall height of the device. On the other hand, the first rear cavity 102 and the second rear cavity 103 can be directly connected to the cavity of the electronic device, using the rear cavity of the whole machine as the rear cavity of the sound-emitting device, thereby improving sensitivity and reducing the vibration resistance of the vibration component.

[0063] The present invention also proposes an electronic device, which includes an electronic device housing and a sound-generating device. The specific structure of the sound-generating device is as described in the above embodiments. Since the electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0064] The electronic device housing has a housing space and a sound outlet connecting the housing space. The sound-emitting device is located in the housing space. The first front cavity 101 is connected to the external environment of the electronic device via a path including the front cavity sound hole 11 and the sound outlet. The first rear cavity 102 and the second rear cavity 103 are connected to the housing space via the rear cavity sound hole 12.

[0065] It should be understood that there may be a channel formed by other components between the front cavity sound hole 11 and the sound outlet hole, such as a through hole provided on the sound outlet part 202 of the housing 200 corresponding to the front cavity sound hole 11.

[0066] In the technical solution of this invention, the outer shell 200 is connected to only one side of the sound-generating device, leaving the other side exposed, thus forming a semi-modular structure. This saves on back cover design and reduces the overall thickness of the sound-generating device. Furthermore, this semi-modular structure can better adapt to the internal layout of different electronic devices when assembled into them. The first rear cavity 102 and the second rear cavity 103 are directly connected to the space of the electronic device, thereby using the rear cavity of the entire device as the rear cavity of the sound-generating device. The large volume of the rear cavity reduces the vibration resistance of the vibration component, improves sensitivity, and reduces sound loss during propagation. The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: case; A vibrating assembly, connected to the housing, includes a diaphragm assembly and a voice coil. The diaphragm assembly includes a first diaphragm, an isolation diaphragm, and a second diaphragm spaced apart along a first direction. The voice coil is connected to the second diaphragm. A connecting portion is provided between the first diaphragm and the second diaphragm, and the connecting portion abuts against the isolation diaphragm, thereby defining a first rear cavity between the first diaphragm and the isolation diaphragm, and defining a first front cavity between the second diaphragm and the isolation diaphragm. A magnetic circuit assembly is connected to the housing. The magnetic circuit assembly is located on the side of the second diaphragm away from the first diaphragm. The magnetic circuit assembly has a magnetic gap for housing the voice coil. A second rear cavity is defined between the magnetic circuit assembly and the second diaphragm. The walls of the first and second rear cavities are provided with rear cavity acoustic holes, and the walls of the first front cavity are provided with front cavity acoustic holes.

2. The sound-generating device as described in claim 1, characterized in that, Both the first diaphragm and the second diaphragm include a vibrating plate and a folded ring disposed around the periphery of the vibrating plate, wherein, The middle portion of the vibrating plate of the second diaphragm protrudes towards the direction of the first diaphragm to form the connecting portion, and the inner side of the isolation diaphragm is sandwiched between the connecting portion and the first diaphragm; or, the middle portion of the vibrating plate of the first diaphragm protrudes towards the direction of the second diaphragm to form the connecting portion, and the inner side of the isolation diaphragm is sandwiched between the connecting portion and the second diaphragm; or, the middle portions of the vibrating plates of the first diaphragm and the vibrating plates of the second diaphragm both protrude towards each other to form two connecting portions, and the two connecting portions respectively abut against the two opposite sides of the isolation diaphragm along the first direction.

3. The sound-generating device as described in claim 2, characterized in that, The connecting portion includes an inclined portion that is angled to the first direction; and / or Along the protruding direction of the connecting portion, the cross-sectional dimension of the connecting portion gradually decreases.

4. The sound-generating device as described in claim 1, characterized in that, The housing includes a housing body and an isolation plate connected to the inner wall of the housing body. The outer edge of the isolation diaphragm is connected to the isolation plate. The housing body has a first side end and a second side end arranged opposite to each other along a first direction. At least the first side end is open. The first diaphragm is covered on the first side end. The magnetic circuit assembly is connected to the second side end.

5. The sound-generating device as described in claim 4, characterized in that, The edge of the partition plate is recessed to define an annular sealant area together with the shell body. This annular sealant area is used for injecting sealant to create a sealed connection between the partition plate and the shell body; and / or, The shell body is stepped, forming a first stepped surface facing the first side end within the inner cavity of the shell body; the second diaphragm is disposed within the shell, and the edge of the second diaphragm is in contact with the first stepped surface; and / or, The inner cavity of the shell body is provided with a protrusion at the corner, and multiple protrusions together form a second step surface. The edge of the isolation plate is in contact with the second step surface.

6. The sound-generating device as claimed in claim 1, characterized in that, The housing includes a first housing and a second housing stacked along a first direction. The first housing is open on the side away from the second housing, and a hollow area is formed in the middle of the other side of the first housing. The second housing is stepped to form a supporting surface facing the first housing. The first diaphragm is disposed on the open side of the first housing; The isolation diaphragm is connected to the other side of the first housing and is configured to cover the hollow area; The second diaphragm is connected to the second housing, and the edge of the second diaphragm is in contact with the supporting surface.

7. The sound-generating device as claimed in claim 1, characterized in that, The magnetic circuit assembly includes a magnetic yoke, a central magnetic part, a side magnetic part, a central magnetic guide plate, and a side magnetic guide plate. The central magnetic part is fixed between the magnetic yoke and the central magnetic guide plate, the side magnetic part is fixed between the magnetic yoke and the side magnetic guide plate, a magnetic gap is formed between the central magnetic guide plate and the side magnetic guide plate, and the side magnetic guide plate is connected to the housing.

8. The sound-generating device as claimed in claim 7, characterized in that, The housing is made of a magnetically conductive metal, and the side of the housing away from the first diaphragm is bent inward to form the side magnetic plate, which is connected to the side magnetic part; and / or, The magnetic yoke has a stepped surface on the side facing away from the first diaphragm for use with the isolation mesh; and / or, The central magnetic part includes a central magnet, and the side magnetic part includes a plurality of side magnets arranged at intervals along the circumference of the central magnet. Among the plurality of side magnets, two first side magnets are respectively disposed on opposite sides of the central magnet along a second direction. Each first side magnet includes a first extension segment and a second extension segment. The first extension segment extends along a third direction, and the second extension segment connects to the middle of the first extension segment and extends along a second direction. The second direction and the third direction are two intersecting directions.

9. The sound-generating device as described in claim 7, characterized in that, The magnetic yoke has a bent portion that bends and extends toward the side where the vibration assembly is located. The bent portion extends into the inner cavity of the housing and is positioned in conjunction with the inner surface of the housing.

10. The sound-generating device as claimed in claim 9, characterized in that, The housing has a hollowed-out portion on the side away from the vibration component; The bent portion extends into the hollowed-out portion; The central magnetic part includes a central magnet, and the side magnetic part includes a plurality of side magnets arranged at intervals along the circumference of the central magnet. The two sides of the side magnets opposite each other along a first direction are attached to the housing and the magnetic yoke, and the side of the side magnets facing the hollow part is attached to the bent part.

11. The sound-generating device as claimed in claim 1, characterized in that, Along the circumference of the housing, a plurality of front cavity acoustic holes are provided on one side of the housing, and a plurality of rear cavity acoustic holes are provided on the remaining side of the housing.

12. The sound-generating device according to any one of claims 1-11, characterized in that, The sound-generating device further includes a housing, which includes a main body and a sound-emitting part located on the side of the main body. The main body is disposed on one side of the sound-generating device. The main body is connected to the vibration assembly and forms a second front cavity between itself and the first diaphragm. The sound-emitting part communicates with the second front cavity and the sound hole of the front cavity.

13. An electronic device, characterized in that, The device includes an electronic device housing and a sound-generating device as described in any one of claims 1-12, wherein the electronic device housing has a receiving space and a sound outlet communicating with the receiving space, the sound-generating device is disposed within the receiving space, the first front cavity is communicating with the external environment of the electronic device via a path including the front cavity sound outlet and the sound outlet, and the first rear cavity and the second rear cavity are communicating with the receiving space via the rear cavity sound outlet.

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