Sound production device and electronic device

Abstract

This invention discloses a sound-generating device and electronic device, relating to the field of loudspeaker technology. The sound-generating device includes a housing, a vibrating component, and a magnetic circuit component. The housing includes a first housing and a second housing. The vibrating component includes a diaphragm component and a voice coil. The diaphragm component includes a first diaphragm and a second diaphragm. The voice coil is connected to the second diaphragm. An isolation diaphragm is disposed between the first diaphragm and the second diaphragm. A first rear cavity is defined between the first diaphragm and the isolation diaphragm. A first front cavity is defined between the second diaphragm and the isolation diaphragm. A second rear cavity is defined between the magnetic circuit component and the second diaphragm. The walls of both the first and second rear cavities are provided with rear cavity sound holes, and the wall of the first front cavity is provided with a front cavity sound hole. The total equivalent radiation area is the sum of the equivalent areas of the first and second diaphragms. The positioning and installation of the first and second diaphragms are achieved through the embedded fit of the first and second housings, maximizing the external dimensions of the magnetic circuit component and enhancing the magnetic field effect.

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 can significantly increase the effective sound-generating area of ​​a loudspeaker and enhance the magnetic field effect.

[0004] To achieve the above objectives, the present invention provides a sound-generating device, the sound-generating device comprising: The housing includes a first housing and a second housing disposed inside the first housing; A vibrating assembly includes a diaphragm assembly and a voice coil. The diaphragm assembly includes a first diaphragm and a second diaphragm spaced apart along a first direction and capable of synchronous vibration. The first diaphragm is connected to one end of a first housing along the first direction. The second diaphragm is disposed within the first housing, and its edge is connected to one end of the second housing along the first direction. The voice coil is connected to the second diaphragm. An isolation diaphragm is disposed between the first diaphragm and the second diaphragm, such that a first rear cavity is defined between the first diaphragm and the isolation diaphragm, and a first front cavity is defined between the second diaphragm and the isolation diaphragm. A magnetic circuit assembly is connected to the other end of the first housing along a first direction. 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, the housing further includes an isolation plate connected to the inner side of the first housing, the isolation diaphragm is a flexible membrane, the outer periphery of the isolation diaphragm is connected to the isolation plate, and the central portion of the isolation diaphragm is connected to at least one of the first diaphragm and the second diaphragm.

[0006] In one embodiment, a boss is provided at the corner of the inner cavity of the first housing, and a plurality of bosses together form a stepped surface. The stepped surface is located between the first diaphragm and the second housing, and the edge of the isolation plate is in contact with the stepped surface; and / or, The outer edge of the partition plate is recessed to define an annular sealant region together with the first housing. The annular sealant region is used to inject sealant so that the partition plate and the first housing are sealed together.

[0007] In one embodiment, a connecting portion is provided between the first diaphragm and the second diaphragm to connect the two, and the center portion of the isolation diaphragm is fixed to the connecting portion.

[0008] In one embodiment, both the first diaphragm and the second diaphragm include a vibrating plate and a folded ring disposed around the periphery of the vibrating plate. The middle portion of one of the vibrating plates protrudes toward the other vibrating plate to form a connecting portion. The connecting portion abuts against the isolation diaphragm and the other vibrating plate to separate and form the first front cavity and the first rear cavity.

[0009] In one embodiment, the middle portion of the vibrating plate of the second diaphragm protrudes towards the first diaphragm to form the connecting portion, and the central portion of the isolating 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 second diaphragm to form the connecting portion, and the central portion of the isolating diaphragm is sandwiched between the connecting portion and the second diaphragm; or, The first diaphragm's vibrating plate and the second diaphragm's vibrating plate both have a protruding connecting portion on one side facing each other, and the two connecting portions respectively abut against the center portion of the isolation diaphragm on opposite sides along a first direction.

[0010] In one embodiment, the cross-sectional width of the connecting portion gradually decreases along the first direction; or, The connecting portion includes an inclined portion arranged at an angle to the first direction and a vertical portion connected to the inclined portion, wherein the center portion of the isolation diaphragm is fixed to the vertical portion; or... The connecting part is bonded to the first diaphragm, the second diaphragm, or the isolation diaphragm.

[0011] In one embodiment, along the circumferential direction of the first housing, a plurality of front cavity acoustic holes are provided on one side of the first housing, and a plurality of rear cavity acoustic holes are provided on the remaining side of the first housing.

[0012] In one embodiment, the magnetic circuit assembly is flush with the outer surface of the first housing; wherein, 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 and the side magnetic part are fixed to the surface of the magnetic yoke facing the vibration assembly and form the magnetic gap between them, the central magnetic guide plate and the side magnetic guide plate are respectively fixed to the surface of the central magnetic part and the side magnetic part facing the vibration assembly, the outer surface of the magnetic yoke and the outer surface of the side magnetic part are flush with the first housing, the first housing is made of magnetically conductive metal, and the side of the first housing away from the first diaphragm is bent inward to form the side magnetic guide plate.

[0013] In one embodiment, the first housing has a hollow portion on the side away from the vibration component, and the magnetic yoke has a bent portion extending into the hollow portion, the bent portion being in contact with the inner surface of the hollow portion.

[0014] 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 located 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.

[0015] The present invention also proposes an electronic device, including an electronic device housing and a sound-generating device, the sound-generating device comprising: The housing includes a first housing and a second housing disposed inside the first housing; A vibrating assembly includes a diaphragm assembly and a voice coil. The diaphragm assembly includes a first diaphragm and a second diaphragm spaced apart along a first direction and capable of synchronous vibration. The first diaphragm is connected to one end of a first housing along the first direction. The second diaphragm is disposed within the first housing, and its edge is connected to one end of the second housing along the first direction. The voice coil is connected to the second diaphragm. An isolation diaphragm is disposed between the first diaphragm and the second diaphragm, such that a first rear cavity is defined between the first diaphragm and the isolation diaphragm, and a first front cavity is defined between the second diaphragm and the isolation diaphragm. A magnetic circuit assembly is connected to the other end of the first housing along a first direction. 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 rear cavity and the second rear cavity 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.

[0016] In the technical solution of this invention, the isolation diaphragm can separate the space between the first diaphragm and the second diaphragm to form a first front cavity and a first rear cavity, ensuring that the two are not connected to each other. The voice coil moves along a first direction under the action of the magnetic circuit assembly, driving the first and second diaphragms to vibrate simultaneously. During this process, the isolation diaphragm maintains a sealed fit with the housing, thereby ensuring that the first front cavity and the second rear cavity are independent of each other. Ultimately, a larger effective diaphragm area is achieved within a limited volume. In this structure, the total equivalent radiation area is the sum of the equivalent areas of the first and second diaphragms, which is beneficial for improving the speaker's sensitivity. The positioning and installation of the first and second diaphragms are achieved through an embedded fit between the first and second housings, providing good positioning and support effects, maximizing the external dimensions of the magnetic circuit assembly, enhancing the magnetic field effect, and providing an excellent sound experience. Attached Figure Description

[0017] 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.

[0018] 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 first housing and the magnetic circuit assembly in operation; Figure 5 for Figure 1 Exploded view of the central magnetic circuit assembly; Figure 6 for Figure 1 A schematic diagram showing the interaction of the first diaphragm, the second diaphragm, and the isolation diaphragm. Figure 7 for Figure 1 A cross-sectional schematic diagram of the sound-generating device and its housing.

[0019] Explanation of icon numbers: 100. Sound-generating device; 1. Housing; 11. First housing; 111. Front cavity sound hole; 112. Rear cavity sound hole; 113. Stepped surface; 114. First annular protrusion; 12. Second housing; 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. Wrapper; 3. Magnetic circuit assembly; 31. Magnetic yoke; 311. Bending part; 32. Central magnetic part; 33. Side magnetic part; 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 part.

[0020] 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

[0021] 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 them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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. At the same time, the magnetic circuit assembly and the housing are set to be the same size, thereby maximizing the size of the magnetic circuit assembly and enhancing the magnetic field effect.

[0026] 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.

[0027] Please refer to Figures 1 to 3 The sound-generating device 100 includes a housing 1, a vibration assembly 2, and a magnetic circuit assembly 3. The housing 1 includes a first housing 11 and a second housing 12 disposed inside the first housing 11. The vibration assembly 2 includes a diaphragm assembly and a voice coil 24. The diaphragm assembly includes a first diaphragm 21 and a second diaphragm 22 that are spaced apart along a first direction and capable of vibrating synchronously. The first diaphragm 21 is connected to one end of the first housing 11 along the first direction. The second diaphragm 22 is disposed inside the first housing 11, and the edge of the second diaphragm 22 is connected to one end of the second housing 12 along the first direction. The voice coil 24 is connected to the second diaphragm 22. A magnetic circuit assembly is disposed between the first diaphragm 21 and the second diaphragm 22. An isolation diaphragm 23 is provided, such that a first rear cavity 102 is defined between the first diaphragm 21 and the isolation diaphragm 23, and a first front cavity 101 is defined between the second diaphragm 22 and the isolation diaphragm 23. A magnetic circuit assembly 3 is connected to the other end of the first housing 11 along a first direction. 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 cavity walls of the first rear cavity 102 and the second rear cavity 103 are provided with rear cavity sound holes 112, and the cavity wall of the first front cavity 101 is provided with a front cavity sound hole 111.

[0028] In the technical solution of this invention, 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 connected to each other. The voice coil 24 moves along a first direction under the action of the magnetic circuit assembly 3, driving the first diaphragm 21 and the second diaphragm 22 to vibrate simultaneously. During this process, the isolation diaphragm 23 always maintains a sealed fit with the housing 1, thereby ensuring that the first front cavity 101 and the second rear cavity 103 are independent of each other, 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 21 and the second diaphragm 22, which is beneficial for improving the sensitivity of the speaker. The positioning and installation of the first diaphragm 21 and the second diaphragm 22 are achieved through the embedded fit of the first housing 11 and the second housing 12, providing good positioning and support effects. Furthermore, by placing the magnetic circuit assembly 3 outside the housing 1, the external dimensions of the magnetic circuit assembly 3 are maximized, enhancing the magnetic field effect and providing an excellent sound experience. The maximum size of the sound-generating device 100 is the external size of the first housing 11, thereby maximizing the size of the relevant components within a limited space while meeting the requirements of miniaturization.

[0029] It should be understood that the first diaphragm 21, the second diaphragm 22 and the isolation diaphragm 23 are all sealed to the housing 1. At the same time, the isolation diaphragm 23 should be bonded to the first diaphragm 21 and the second diaphragm 22, so as to isolate the first front cavity 101 and the first rear cavity 102, while ensuring the synchronous vibration of the three.

[0030] Please refer to Figures 3 to 4 A first diaphragm 21 and a magnetic circuit assembly 3 are respectively disposed on opposite sides of the first housing 11 along a first direction; a second diaphragm 22 is disposed inside the first housing 11, and the edge of the second diaphragm 22 is connected to one end of the second housing 12 along the first direction, and the magnetic circuit assembly 3 is flush with the outer surface of the first housing 11. The positioning and installation of the first diaphragm 21 and the second diaphragm 22 are achieved by the embedded fit between the first housing 11 and the second housing 12. Both the first housing 11 and the second housing 12 can be designed with simple structures to reduce processing costs. In this case, the second housing 12 serves as a step for positioning.

[0031] The first diaphragm 21 is bonded and fixed to the first housing 11, and one end face of the second housing 12 is bonded and fixed to the periphery of the second diaphragm 22. The other end face of the second housing 12 is fixed to the bottom of the first housing 11 by bonding, or by welding when both are made of metal.

[0032] In some embodiments, the first housing 11 forms a first side end at one end along a first direction, the first side end is open, a first annular protrusion 114 protrudes from the outer side of the first side end, a first diaphragm 21 covers the first side end, and the edge of the first diaphragm 21 covers the outside of the first annular protrusion 114.

[0033] In some embodiments, the second housing 12 forms a second side end at one end along the first direction, the second side end is open, a second annular protrusion is provided on the outer side of the second side end, the second diaphragm 22 is covered on the second side end, and the edge of the second diaphragm 22 covers the outside of the second annular protrusion.

[0034] Based on the two structural forms described above, adhesive can be applied to both the end faces and sides of the first housing 11 and / or the second housing 12 simultaneously, thereby increasing the connection strength with the first diaphragm 21 and / or the second diaphragm 22. The annular protrusion also forms a physical limiting structure, further improving sealing performance by increasing the contact area and mechanical engagement force. Furthermore, the edges of the first diaphragm 21 and / or the second diaphragm 22 are fitted with an interference fit to the first annular protrusion 114 and / or the second annular protrusion, ensuring the stability of acoustic performance.

[0035] In this embodiment, a connecting portion 20 is provided between the first diaphragm 21 and the second diaphragm 22 to connect the two, and the center portion of the isolation diaphragm 23 is fixed to the connecting portion 20.

[0036] Please refer to Figure 1 and Figure 6 At least one of the first diaphragm 21 and the second diaphragm 22 has a central portion protruding towards the other to form a connecting portion 20. The connecting portion 20 abuts against the isolation diaphragm 23 and the other of the first diaphragm 21 and the second diaphragm 22 to separate and form a first front cavity 101 and a first rear cavity 102. The connecting portion 20 can hold the isolation diaphragm 23 against the other diaphragm, thereby connecting 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 the first front cavity 101 and the first rear cavity 102, ensuring that the two are not connected to each other. 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.

[0037] It should be understood that the isolation diaphragm 23 is connected 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.

[0038] The present invention does not limit the structural form of the connecting part 20. The connecting part 20 can be an independent connecting member. The outer periphery of the isolation diaphragm 23 is fixed to the first housing 11, and the center of the isolation diaphragm 23 is fixed to the connecting part 20. In some embodiments, the isolation diaphragm 23 can be provided with corresponding through holes, and the connecting part 20 can be configured as a transmission member. The two ends of the connecting part 20 are connected to the first diaphragm 21 and the second diaphragm 22, and the middle part passes through the isolation diaphragm 23 and is bonded and fixed to the isolation diaphragm 23, thereby realizing the synchronous vibration of the three.

[0039] Specifically, both the first diaphragm 21 and the second diaphragm 22 are composed of a vibrating plate 211 and a folded ring 212. The vibrating plate 211 has a certain rigidity, and the folded ring 212 is a flexible structure. The vibrating plate 211 of one of the first diaphragm 21 and the second diaphragm 22 is set to protrude to form a connecting part 20, so that the connection between the two diaphragms and the synchronization of their vibrations can be achieved without adding new components.

[0040] Since the connecting portion 20 is formed by a partial protrusion of the vibrating plate 211 of the first diaphragm 21 or the second diaphragm 22, 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.

[0041] The present invention does not limit the location of the connecting part 20. In some embodiments, please refer to Figure 6 The middle portion of the vibrating plate 211 of the second diaphragm 22 protrudes towards the first diaphragm 21 to form a connecting portion 20. Taking the first direction as the vertical direction as an example, the connecting portion 20 extends upward, and its upper end face 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 helps maintain 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 helps improve the connection stability of the isolation diaphragm 23.

[0042] 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.

[0043] 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. In this case, the two connecting portions 20 jointly connect the isolation diaphragm 23, and the volume difference between the first front cavity 101 and the second front cavity 104 is smaller in this structure, reducing the sound propagation time difference and timbre difference caused by the cavity volume difference. exist Figure 4 In the embodiment, along the protrusion direction of the connecting part 20, the vibration plate 211 of the second diaphragm 22 is generally set in a stepped manner, and the width of the step gradually decreases towards the first diaphragm 21. This setting can improve the structural strength, reduce stress concentration, and improve the overall stability and reliability of the diaphragm. On the other hand, this stepped setting and inclined segment connection can optimize the vibration propagation path.

[0044] In some embodiments, the cross-sectional width of the connecting portion 20 gradually decreases along the direction away from the vibrating plate 211 in the first direction. This configuration can improve the structural strength of the vibrating plate 211 and avoid excessively large stamping deformation areas on the vibrating plate 211, which would cause manufacturing difficulties.

[0045] In some embodiments, the connecting portion 20 includes an inclined portion angled to the first direction and a vertical portion connected to the inclined portion, with the center of the isolation diaphragm 23 fixed to the vertical portion. That is, the cross-sectional width of the connecting portion 20 gradually decreases to form the inclined portion, and then the vertical portion is uniformly arranged. The inclined portion helps to improve structural strength and enhance the vibration stability of the connecting portion 20, while the vertical portion ensures effective contact with the diaphragm. Compared to a connecting portion 20 that tapers overall with a large width difference at both ends, this arrangement results in a smaller width difference at both ends, occupies less cavity space, and ensures the structural strength of the connecting portion 20 and the connection area with the isolation diaphragm 23.

[0046] In some embodiments, the connecting portion 20 is bonded to the first diaphragm 21, the second diaphragm 22, or the isolation diaphragm 23.

[0047] 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.

[0048] It should be understood that the connecting part 20 can be bonded to the first diaphragm 21, the second diaphragm 22, or the isolation diaphragm 23, or the connecting part 20 can be flexibly abutted against the isolation diaphragm 23 to ensure a sealing effect by preventing separation during vibration. The connecting part 20 and the first diaphragm 21 or the second diaphragm 22 can be integrally formed, or if they are made of the same metal material, they can be welded together.

[0049] To facilitate the connection between the isolation diaphragm 23 and the housing 1, in this embodiment, the housing 1 further includes an isolation plate 232 connected to the inner side of the first housing 11. The isolation diaphragm 23 is a flexible membrane. The outer periphery of the isolation diaphragm 23 is connected to the isolation plate 232, and the center of the isolation diaphragm 23 is connected to at least one of the first diaphragm 21 and the second diaphragm 22.

[0050] The isolating diaphragm 23 is made of flexible material and its shape is adapted to the connecting part 20, with a corresponding concave-convex design. This ensures an effective contact area between the two when they mate with the connecting part 20, reduces the stretching deformation of the flexible diaphragm, and improves durability. The isolating plate 232 can be made of metal or high-rigidity plastic, etc. The isolating plate 232 should have sufficient rigidity to prevent self-resonance or to orient its vibration mode towards high frequencies, avoiding the audible audio frequency band.

[0051] 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 effect of sealing the isolation cavity and the effect of synchronous vibration with the diaphragms on both sides.

[0052] Based on the above embodiments, the edge of the isolation plate 232 should be sealed to the first housing 11. Considering that the isolation plate 232 is relatively thin and the effective connection area for peripheral adhesive injection is small, sealing failure is likely to occur during vibration of the isolation plate 232. Therefore, please refer to... Figure 1 and Figure 4 The edge of the partition plate 232 is recessed to define an annular sealant region 2320 together with the housing 1. Sealant is injected into the annular sealant region 2320 to achieve a sealed connection between the partition plate 232 and the housing 1. Specifically, the edge thickness of the partition plate 232 can be reduced to form a recess, and the annular sealant region 2320 can be an open area. The width and depth of the recessed portion are mainly used to accommodate the sealant, improving the adhesion between the partition plate 232 and the housing 1. In this embodiment, the overall thickness of the partition plate 232 is relatively uniform, and its edges are bent to create a recessed effect within the plane.

[0053] Furthermore, an annular rubber region 2320 is formed on the side of the isolation plate 232 facing the first diaphragm 21.

[0054] Considering the installation and positioning of the isolation diaphragm 23, a boss is provided at the corner of the inner cavity of the first housing 11. Multiple bosses together form a stepped surface 113, which is located between the first diaphragm 21 and the second housing 12. The edge of the isolation diaphragm 23 is in contact with the stepped surface 113. This achieves the initial positioning of the isolation diaphragm 23 within the inner cavity of the first housing 11, ensuring the accuracy of its installation position.

[0055] Based on the composition of the isolation diaphragm 23, the edge of the isolation plate 232 overlaps on the stepped surface 113, which can enhance the connection stability between the isolation plate 232 and the first housing 11. At the same time, in order to further improve the sealing performance and connection strength between the isolation plate 232 and the first housing 11, an appropriate amount of sealant can be applied to the part where the isolation plate 232 and the stepped surface 113 are in contact, so that the two are connected more tightly.

[0056] It should be understood that, in order to avoid mutual interference between the airflow of the first front cavity 101, the first rear cavity 102, and the second rear cavity 103, the front cavity acoustic port 111 and the rear cavity acoustic port 112 are preferably staggered. Please refer to... Figure 1 Along the circumference of the first housing 11, a plurality of front cavity acoustic holes 111 are provided on one side of the first housing 11, and a plurality of rear cavity acoustic holes 112 are provided on the remaining sides of the first housing 11. When the first housing 11 is square, the first housing 11 has four sides, one side of which is provided with a plurality of front cavity acoustic holes 111 arranged in a straight line, and the remaining three sides are each provided with a plurality of rear cavity acoustic holes 112. This can achieve isolation of sound waves radiated from the front and rear cavities, and improve the sound production performance of the sound generating device. The plurality of rear cavity acoustic holes 112 on each side are arranged in a straight line.

[0057] It should be understood that the number of front cavity acoustic holes 111 and rear cavity acoustic holes 112 may be different on two adjacent sides.

[0058] In practical applications, the size of the rear cavity acoustic hole 112 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 that the periphery of the housing 1 needs to be provided with the front cavity acoustic hole 111 and the rear cavity acoustic hole 112 corresponding to the first front cavity 101 and the first rear cavity 102, please refer to... Figure 1 and Figure 5 The first housing 11 has a partially hollowed-out section on the side away from the first diaphragm 21 to form a rear cavity acoustic hole 112 that connects to the second rear cavity 103, ensuring air circulation and maintaining the overall structural strength of the housing 1.

[0059] The magnetic circuit assembly 3 is flush with the outer surface of the housing 1, thereby maximizing the external dimensions of the magnetic circuit assembly 3 and increasing the magnetic field effect.

[0060] The magnetic circuit assembly 3 includes a magnetic 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 outer surfaces of the magnetic yoke 31 and the side magnetic part 33 are flush with the first housing 11. The magnetic yoke 31 is fixedly connected to the central magnetic part 32 and the side magnetic part 33. The central magnetic part 32 and the side magnetic part 33 are fixed to the surface of the magnetic yoke 31 facing the vibrating assembly, forming a magnetic gap between them. The central magnetic guide plate 34 and the side magnetic guide plate 35 are respectively fixed to the surfaces of the central magnetic part 32 and the side magnetic part 33 facing the vibrating assembly. The outer surfaces of the magnetic yoke 31 and the side magnetic part 33 are flush with the first housing 11. The first housing 11 is made of magnetically conductive metal, and the side of the first housing 11 away from the first diaphragm 21 is bent inward to form the side magnetic guide plate 35. The central magnetic guide plate 34 is located inside the voice coil 24 and is connected to the central magnetic part 32, while the side magnetic guide plate 35 is connected to the side magnetic part 33. This allows the side magnetic guide plate 35 to be integrated with the first housing 11, 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.

[0061] In this embodiment, the central magnetic part 32 includes a central magnet, and the peripheral magnetic part 33 includes four peripheral magnets arranged around the central magnet, thereby forming an annular magnetic gap for housing a single voice coil 24. Simultaneously, a support 36 is provided to center the voice coil 24 and provide electrical conductivity.

[0062] To achieve synchronous vibration of the first diaphragm 21 and the second diaphragm 22, in some embodiments, a transmission member is provided that passes through the isolation diaphragm 23, thereby connecting the first diaphragm 21 and the second diaphragm 22. The transmission member can be connected to the isolation diaphragm 23, or it can be movably sealed to the isolation diaphragm 23, allowing it to move relative to the isolation diaphragm 23. That is, during the vibration of the first diaphragm 21 and the second diaphragm 22, the isolation diaphragm 23 can be configured to vibrate synchronously with both, or it can be configured to remain stationary relative to the housing 1.

[0063] The first housing 11 has a hollow section on the side away from the vibrating component. The magnetic yoke 31 has a bent portion 311 extending into the hollow section, and the bent portion 311 fits against the inner surface of the hollow section. This achieves the effect of positioning the magnetic yoke 31 in conjunction with the inner surface of the first housing 11. This is beneficial for controlling the concentricity of the magnetic circuit component and the voice coil 24.

[0064] The side magnets are attached to the first housing 11 and the magnetic yoke 31 on opposite sides along the first direction, and the side of the side magnets facing the hollowed-out portion is attached to the bent portion 311. At this time, the bent portion 311 not only serves to connect the first housing 11, but also serves to position the side magnets.

[0065] In some embodiments, the magnetic yoke 31 is stepped on the side away from the first diaphragm 21 to cooperate with the isolation net, which can cover the hollowed-out area on the first housing 11, 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 hollowed-out area of ​​the first housing 11 to avoid obstructing the hollowed-out area.

[0066] 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 the voice coil 24 is connected to the convex portion. This ensures a tight connection between the voice coil 24 and the vibrating plate 211, while also adapting to the height position of the voice coil 24. When the vibrating plate 211 is set as a step, one of the steps serves as the convex portion.

[0067] Specifically, the first housing 11 is formed by stretching magnetically conductive metal and has a side magnetically conductive plate 35 at the bottom. The three side walls of the first housing 11 above the stepped surface have formed rear cavity acoustic holes 112, and the side wall between the stepped surface 113 and the second housing 12 has formed front cavity acoustic holes 111.

[0068] Generally speaking, the larger the size of the sound-generating device 1, the more air it can push, thus producing a lower frequency and fuller sound. In common loudspeakers, the sound-generating device 1 is usually located inside the outer casing, forming a front and rear cavity with the outer 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 100 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 100, 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 111. 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 100. 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-generating device 100, thereby improving sensitivity and reducing the vibration resistance of the vibration component.

[0069] The present invention also proposes an electronic device, which includes an electronic device housing and a sound-generating device 100. The specific structure of the sound-generating device 100 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.

[0070] The electronic device housing has a housing space and a sound outlet connecting the housing space. The sound-emitting device 100 is disposed 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 111 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 112.

[0071] It should be understood that there may be a channel formed by other components between the front cavity sound hole 111 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 111.

[0072] In the technical solution of this invention, the outer shell 200 is connected to only one side of the sound-generating device 100, leaving the other side exposed, thus forming a semi-modular structure. This saves on the design of the back cover and reduces the overall thickness of the sound-generating device 100. 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 100. The large volume of the rear cavity reduces the vibration resistance of the vibration component, improves sensitivity, and reduces sound loss during propagation.

[0073] 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: The housing includes a first housing and a second housing disposed inside the first housing; A vibrating assembly includes a diaphragm assembly and a voice coil. The diaphragm assembly includes a first diaphragm and a second diaphragm spaced apart along a first direction and capable of synchronous vibration. The first diaphragm is connected to one end of a first housing along the first direction. The second diaphragm is disposed within the first housing, and its edge is connected to one end of the second housing along the first direction. The voice coil is connected to the second diaphragm. An isolation diaphragm is disposed between the first diaphragm and the second diaphragm, such that a first rear cavity is defined between the first diaphragm and the isolation diaphragm, and a first front cavity is defined between the second diaphragm and the isolation diaphragm. A magnetic circuit assembly is connected to the other end of the first housing along a first direction. 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, The housing also includes an isolation plate connected to the inner side of the first housing. The isolation diaphragm is a flexible membrane. The outer periphery of the isolation diaphragm is connected to the isolation plate, and the center of the isolation diaphragm is connected to at least one of the first diaphragm and the second diaphragm.

3. The sound-generating device as described in claim 2, characterized in that, A boss is provided at the corner of the inner cavity of the first housing, and multiple bosses together form a stepped surface. The stepped surface is located between the first diaphragm and the second housing, and the edge of the isolation plate is in contact with the stepped surface; and / or, The outer edge of the partition plate is recessed to define an annular sealant region together with the first housing. The annular sealant region is used to inject sealant so that the partition plate and the first housing are sealed together.

4. The sound-generating device as described in claim 2, characterized in that, A connecting portion is provided between the first diaphragm and the second diaphragm, and the center portion of the isolation diaphragm is fixed to the connecting portion.

5. The sound-generating device as described in claim 4, 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. The middle portion of one of the vibrating plates protrudes toward the other vibrating plate to form a connecting portion. The connecting portion abuts against the isolation diaphragm and the other vibrating plate to separate and form the first front cavity and the first rear cavity.

6. The sound-generating device as described in claim 5, characterized in that, The middle portion of the second diaphragm's vibrating plate protrudes towards the first diaphragm to form the connecting portion, and the central portion 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 second diaphragm to form the connecting portion, and the central portion of the isolating diaphragm is sandwiched between the connecting portion and the second diaphragm; or, The first diaphragm's vibrating plate and the second diaphragm's vibrating plate both have a protruding connecting portion on one side facing each other, and the two connecting portions respectively abut against the center portion of the isolation diaphragm on opposite sides along a first direction.

7. The sound-generating device as described in claim 4, characterized in that, The cross-sectional width of the connecting portion gradually decreases along the first direction; or, The connecting portion includes an inclined portion arranged at an angle to the first direction and a vertical portion connected to the inclined portion, wherein the center portion of the isolation diaphragm is fixed to the vertical portion; or... The connecting part is bonded to the first diaphragm, the second diaphragm, or the isolation diaphragm.

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

9. The sound-generating device as claimed in claim 1, characterized in that, The magnetic circuit assembly is flush with the outer surface of the first housing; wherein, 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 and the side magnetic part are fixed to the surface of the magnetic yoke facing the vibration assembly and form the magnetic gap between them, the central magnetic guide plate and the side magnetic guide plate are respectively fixed to the surface of the central magnetic part and the side magnetic part facing the vibration assembly, the outer surface of the magnetic yoke and the outer surface of the side magnetic part are flush with the first housing, the first housing is made of magnetically conductive metal, and the side of the first housing away from the first diaphragm is bent inward to form the side magnetic guide plate.

10. The sound-generating device as claimed in claim 9, characterized in that, The first housing has a hollowed-out portion on the side away from the vibration component, and the magnetic yoke has a bent portion that extends into the hollowed-out portion, and the bent portion is in contact with the inner surface of the hollowed-out portion.

11. The sound-generating device according to any one of claims 1-10, 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 located 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.

12. 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 1-11, 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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