Sound production monomer and sound production module

Abstract

This invention discloses a sound-generating unit and a sound-generating module, relating to the field of electroacoustic energy conversion technology. The sound-generating unit includes a housing, a magnetic circuit system, and a vibration system. The housing includes a first outer shell and a second outer shell arranged along a first direction. The vibration system includes two voice coils, a support, a first diaphragm, an isolation diaphragm, and a second diaphragm. The outer edge of the second diaphragm is sandwiched between the first and second outer shells. The two ends of the support along the first direction are connected to the first and second diaphragms, respectively. A first rear cavity is formed between the isolation diaphragm and the first diaphragm, and a first front cavity is formed between the isolation diaphragm and the second diaphragm. The housing has a first front cavity acoustic hole communicating with the first front cavity and a first rear cavity acoustic hole communicating with the first rear cavity. This ensures that the total effective vibration area of ​​the sound-generating unit is the sum of the effective vibration areas of the first and second diaphragms, thereby increasing the effective vibration area of ​​the vibration system without increasing the product size.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic energy conversion technology, and in particular to a sound-generating unit and a sound-generating module. Background Technology

[0002] The effective sound-producing area of ​​a conventional loudspeaker is limited by the product's external dimensions, and because the diaphragm surround vibrates without a piston, the effective air area propelled by the vibration system will not exceed the product's external dimensions.

[0003] Current smart products are trending towards thinner and lighter designs, resulting in limited internal space and making it difficult to increase speaker size. Consequently, it is also difficult to increase the effective sound-generating area of ​​the vibration system. Summary of the Invention

[0004] The main objective of this invention is to propose a sound-generating unit and a sound-generating module, which aims to increase the effective vibration area of ​​the vibration system without increasing the product size.

[0005] To achieve the above objectives, the present invention provides a sound-generating unit comprising: A housing, the housing comprising a first outer shell and a second outer shell arranged along a first direction; A magnetic circuit system, the magnetic circuit system being connected to the second housing, the magnetic circuit system forming at least two magnetic gaps; A vibration system includes two voice coils, a support, and a first diaphragm, an isolation diaphragm, and a second diaphragm arranged sequentially and spaced apart along a first direction. The outer edge of the first diaphragm is connected to the end of the first housing away from the second housing. The outer edge of the second diaphragm is sandwiched between the first housing and the second housing. The voice coils and the magnetic circuit system are located on the side of the second diaphragm away from the first diaphragm. Each voice coil is arranged corresponding to its respective magnetic gap, and the two voice coils are connected to the second diaphragm. The isolation diaphragm includes an outer connecting portion, a folded loop portion, and an inner connecting portion arranged sequentially from the outside to the inside. The outer connecting portion is connected to the first housing. The bracket extends along the first direction, one end of the bracket is connected to the first diaphragm, the other end of the bracket is connected to the second diaphragm, and the inner connecting portion is connected to the bracket; wherein... A first rear cavity is formed between the isolation diaphragm and the first diaphragm, a second rear cavity is formed between the second diaphragm and the magnetic circuit system, and a first front cavity is formed between the isolation diaphragm and the second diaphragm. The first housing is provided with a first front cavity acoustic hole communicating with the first front cavity and a first rear cavity acoustic hole communicating with the first rear cavity.

[0006] In one embodiment, the first diaphragm includes a first folded ring and a first dome, the first folded ring having a first through hole and the first dome covering the first through hole; the second diaphragm includes a second folded ring and a second dome, the second folded ring having a second through hole and the second dome covering the second through hole, one end of the bracket being connected to the first dome and the other end of the bracket being connected to the second dome; And / or, the inner connecting portion is sandwiched between the end of the bracket away from the first diaphragm and the second diaphragm.

[0007] In one embodiment, the first outer shell includes a first shell body and a second shell body stacked along the first direction. The end of the first shell body away from the second shell body is connected to the outer edge of the first diaphragm. The second diaphragm is sandwiched between the second shell body and the second outer shell. The outer connecting portion is connected to the second shell body. The first diaphragm, the first shell body, the second shell body, and the isolation diaphragm form the first rear cavity. The second shell body, the isolation diaphragm, and the second diaphragm form the first front cavity. The side wall of the first shell body has a sound hole for the first rear cavity, and the side wall of the second shell body has a sound hole for the first front cavity.

[0008] In one embodiment, the first rear cavity acoustic hole is located on multiple sides of the first shell body, and the first front cavity acoustic hole and the first rear cavity acoustic hole are located on different sides of the first shell. And / or, the sound-generating unit is further provided with a second rear cavity sound hole communicating with the second rear cavity; And / or, the second shell body includes an isolation top plate and a shell side wall connected to the periphery of the isolation top plate, the second diaphragm is sandwiched between the shell side wall and the second shell; a third through hole is opened in the middle of the isolation top plate, the outer connecting part is connected to the isolation top plate, and the isolation diaphragm covers the third through hole.

[0009] In one embodiment, the first shell body, the second shell body, and the second outer shell are all made of metal. The shell also includes a metal connector, which is welded to the first shell body and the second outer shell, or the metal connector is welded to all three shell bodies.

[0010] In one embodiment, there are multiple first shells, which are stacked sequentially along the first direction. The number of first diaphragms is the same as the number of first shells and they are arranged in a one-to-one correspondence. One first diaphragm is connected to the end of a first shell away from the second shell. The first shell closest to the second shell is defined as the bottom shell, and the remaining first shells are stacked shells. The second diaphragm is sandwiched between the bottom shell and the second shell. The number of the bracket and the isolation diaphragm is the same as the number of first shells and they are arranged in a one-to-one correspondence. The bracket is also used to connect adjacent first diaphragms corresponding to the stacked shells. An isolation diaphragm is arranged between any two adjacent first diaphragms. The isolation diaphragm divides the space between two adjacent first diaphragms into an auxiliary front cavity and an auxiliary rear cavity. The stacked shells have an auxiliary front cavity acoustic hole communicating with the auxiliary front cavity and an auxiliary rear cavity acoustic hole communicating with the auxiliary rear cavity.

[0011] In one embodiment, the first diaphragm includes a first folded ring and a first dome disposed at the center of the first folded ring, and the second diaphragm includes a second folded ring and a second dome disposed at the center of the second folded ring; wherein, The bracket and the first dome are integrally molded components, and the bracket is formed by stretching from the middle of the first dome toward the direction close to the second diaphragm; or, the bracket and the first dome are bonded together by a first adhesive layer.

[0012] In one embodiment, the bracket is bonded to the first dome via a first adhesive layer. The bracket includes an extension, a gradually expanding portion, and a fitting portion arranged and connected sequentially along the first direction. The extension extends along the first direction, and one end of the extension away from the gradually expanding portion is connected to the second dome. The cross-sectional dimension of the gradually expanding portion along the first direction gradually expands from the end connected to the extension in a direction away from the second diaphragm. The fitting portion is formed by bending and extending the gradually expanding portion outward from the end away from the extension, and the fitting portion is bonded to the first dome.

[0013] In one embodiment, the magnetic circuit system includes a magnetic yoke and a central magnet assembly and a side magnet assembly disposed on the magnetic yoke. The side magnet assembly includes a first side magnet and two second side magnets disposed on both sides of the first side magnet along a second direction. The central magnet assembly includes two central magnets disposed between the first side magnet and the second side magnets. The first side magnet, the second side magnet, and the central magnet are all spaced apart from each other. Two magnetic gaps are respectively disposed around the two central magnets. The second direction is the short axis direction of the voice coil, and the two voice coils are arranged side by side along the second direction.

[0014] In one embodiment, the first side magnet includes a central portion and end portions respectively disposed at both ends of the central portion along the long axis of the voice coil. The end portions extend along the second direction. The central portion is disposed opposite to the long axis of the voice coil, and the end portions are disposed opposite to the short axis of the voice coil. And / or, the magnetic yoke includes a yoke body and a positioning plate formed by bending and extending the edge of the yoke body toward the side where the vibration system is located, and the second housing is provided with a positioning hole for the positioning plate to be inserted, and the positioning plate is tightly fitted with the hole wall of the positioning hole; And / or, the magnetic yoke is provided with a clearance groove on the side facing the voice coil to avoid the voice coil, and the number of clearance grooves is the same as the number of voice coils and is provided in a one-to-one correspondence; And / or, the shape of the magnetic yoke is adapted to the shape of the side magnet assembly and the center magnet assembly.

[0015] In one embodiment, the magnetic circuit system further includes a magnetic guide plate assembly, which includes a first side magnetic guide plate disposed on the side of the first side magnet away from the magnetic guide yoke, a second side magnetic guide plate disposed on the side of the second side magnet away from the magnetic guide yoke, and a central magnetic guide plate disposed on the side of the central magnet away from the magnetic guide yoke; wherein... The first side magnetic plate, the second side magnetic plate, and the second outer shell are integrally formed parts, and both the first outer shell and the second outer shell are metal shells; and / or, the shape of the first side magnetic plate is adapted to the shape of the first side magnet.

[0016] In one embodiment, the outer surfaces of the first housing, the second housing, and the magnetic circuit system are substantially aligned, and the outer peripheries of the first diaphragm and the second diaphragm are substantially aligned; And / or, along the circumferential direction of the first housing, a plurality of first front cavity acoustic holes are provided on one side of the first housing, and a plurality of first rear cavity acoustic holes are provided on the remaining side of the first housing. And / or, the sound-generating unit is further provided with a second rear cavity sound hole that communicates with the second rear cavity.

[0017] The present invention also proposes a sound-generating module, the sound-generating module including a module shell and the aforementioned sound-generating unit, the module shell 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 unit, the main body being connected to the sound-generating unit and forming a second front cavity between the main body and the first diaphragm, the sound-emitting part communicating with the second front cavity and the sound hole of the first front cavity.

[0018] The technical solution of this invention employs a method where a magnetic circuit system and two voice coils are positioned on one side of the second diaphragm, and a support is positioned on the other side of the second diaphragm. The two voice coils are positioned corresponding to the two magnetic gaps of the magnetic circuit system, and both voice coils are connected to the second diaphragm. One end of the support is connected to the first diaphragm, and the other end of the support is connected to the second diaphragm. This allows the two voice coils connected to the second diaphragm to drive the first and second diaphragms to vibrate together and produce sound, thereby increasing the driving force of the voice coils on the diaphragm assembly. A first rear cavity is formed between the isolation diaphragm and the first diaphragm, a second rear cavity is formed between the second diaphragm and the magnetic circuit system, and a first front cavity is formed between the isolation diaphragm and the second diaphragm. The housing is provided with a first front cavity sound hole communicating with the first front cavity and a first rear cavity sound hole communicating with the first rear cavity. This ensures that the total effective vibration area of ​​the sound-producing unit is the sum of the effective vibration areas of the first and second diaphragms. Compared to the previous method where the effective vibration area of ​​a single diaphragm is the total effective vibration area of ​​the entire loudspeaker, this application fully utilizes the internal space of the sound-producing unit, thereby increasing the effective vibration area of ​​the vibration system without increasing the product size. Attached Figure Description

[0019] 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.

[0020] Figure 1 A schematic diagram of the structure of an embodiment of the sound-generating unit provided by the present invention; Figure 2 A schematic diagram of the structure of an embodiment of the sound-generating unit provided by the present invention from another perspective; Figure 3 A cross-sectional structural schematic diagram of a portion of the structure of an embodiment of the vibration system provided by the present invention; Figure 4 An exploded structural diagram of an embodiment of the sound-generating monomer provided by the present invention; Figure 5 A top view of an embodiment of the sound-generating unit provided by the present invention; Figure 6 for Figure 5 A schematic cross-sectional view at point AA; Figure 7 for Figure 5 Cross-sectional structural diagram at BB; Figure 8 A schematic diagram of a structure of an embodiment of the first diaphragm, bracket, isolation diaphragm, and second diaphragm provided by the present invention; Figure 9 This is a partial structural schematic diagram of an embodiment of the magnetic circuit system provided by the present invention; Figure 10 A schematic diagram of the structure of a first shell embodiment provided by the present invention; Figure 11 A cross-sectional structural diagram of an embodiment of the stacked arrangement of multiple first outer shells provided by the present invention; Figure 12 A cross-sectional structural diagram of an embodiment of the stacked first outer shell provided by the present invention; Figure 13 A cross-sectional structural schematic diagram of an embodiment of the sound-generating module provided by the present invention; Figure 14 This is an exploded structural diagram of an embodiment of the sound-generating module provided by the present invention.

[0021] Explanation of icon numbers: 100. Sound-generating unit; 1. Housing; 11. First outer shell; 111. First shell body; 1111. First rear cavity acoustic port; 1112. Auxiliary rear cavity acoustic port; 112. Second shell body; 1121. First front cavity acoustic port; 1122. Isolation top plate; 1123. Housing sidewall; 1124. Third through hole; 1125. Auxiliary front cavity acoustic port; 12. Second outer shell; 13. Metal connector; 2. Magnetic circuit system; 21. Magnetic yoke; 211. Yoke body; 2 111. Clearance groove; 212. Magnetic guide protrusion; 2121. Steel mesh mounting surface; 213. Positioning plate; 22. Central magnet assembly; 221. Central magnet; 23. Side magnet assembly; 231. First side magnet; 2311. Central part; 2312. End; 232. Second side magnet; 24. Magnetic guide plate assembly; 241. First side magnetic guide plate; 242. Second side magnetic guide plate; 243. Central magnetic guide plate; 251. First magnetic gap; 252. Second magnetic gap 26. Gap; 3. Avoidance notch; 3. Vibration system; 31. First diaphragm; 311. First surround; 3111. First through hole; 312. First dome; 3121. First connecting part; 3122. First convex hull; 32. Second diaphragm; 321. Second surround; 3211. Second through hole; 322. Second dome; 3221. Second connecting part; 3222. Second convex hull; 33. Voice coil; 331. First voice coil; 332. Second voice coil; 34. Isolation Diaphragm; 341, Outer connecting part; 342, Folded ring part; 343, Inner connecting part; 35, Centering support plate; 351, First fixing part; 352, Second fixing part; 353, Cantilever part; 36, Bracket; 361, Extension part; 3611, Connecting plane; 362, Gradient part; 363, Fitting part; 364, Opening groove; 41, First rear cavity; 42, First front cavity; 43, Second rear cavity; 44, Second front cavity; 45, Auxiliary front cavity; 46, Auxiliary rear cavity; 200. Sound-generating module; 201. Module shell; 202. Main body; 203. Sound output part; 2031. Sound output hole.

[0022] 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

[0023] 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.

[0024] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0025] 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. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, 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. When 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.

[0026] The effective sound-producing area of ​​a conventional loudspeaker is limited by the product's external dimensions, and because the diaphragm surround vibrates without a piston, the effective air area propelled by the vibration system will not exceed the product's external dimensions.

[0027] Current smart products are trending towards thinner and lighter designs, resulting in limited internal space and making it difficult to increase speaker size. Consequently, it is also difficult to increase the effective sound-generating area of ​​the vibration system.

[0028] The inventors discovered that traditional loudspeakers rely on a single voice coil to drive a single diaphragm to vibrate and produce sound. The effective vibration area of ​​a single diaphragm is the effective vibration area of ​​the entire loudspeaker. If the effective vibration area of ​​the loudspeaker is to be increased, the size of the single diaphragm needs to be increased. Increasing the size of the diaphragm will undoubtedly lead to an increase in the overall size of the loudspeaker, which is obviously difficult to meet the current trend of the gradual miniaturization of loudspeakers.

[0029] In view of this, the present invention proposes a sound-generating unit, which aims to solve the technical problem of how to increase the effective vibration area of ​​a vibration system without increasing the product size.

[0030] Please see Figure 1 , Figure 3 and Figure 6 In one embodiment of the present invention, the sound-generating unit 100 includes a housing 1, a magnetic circuit system 2, and a vibration system 3. The housing 1 includes a first outer shell 11 and a second outer shell 12 arranged along a first direction; the magnetic circuit system 2 is connected to the second outer shell 12, and the magnetic circuit system 2 forms at least two magnetic gaps; the vibration system 3 includes two voice coils 33, a support 36, and a first diaphragm 31, an isolation diaphragm 34, and a second diaphragm 32 arranged sequentially and spaced apart along the first direction; the outer edge of the first diaphragm 31 is connected to the end of the first outer shell 11 away from the second outer shell 12, and the outer edge of the second diaphragm 32 is sandwiched between the first outer shell 11 and the second outer shell 12. The voice coils 33 and the magnetic circuit system 2 are located on the side of the second diaphragm 32 away from the first diaphragm 31. Each voice coil 33 is arranged corresponding to each magnetic gap. The isolation diaphragm 34 is connected to the second diaphragm 32. The isolation diaphragm 34 includes an outer connecting part 341, a folded ring part 342 and an inner connecting part 343 arranged sequentially from the outside to the inside. The outer connecting part 341 is connected to the first outer shell 11. The bracket 36 extends along the first direction. One end of the bracket 36 is connected to the first diaphragm 31 and the other end of the bracket 36 is connected to the second diaphragm 32. The inner connecting part 343 is connected to the bracket 36. A first rear cavity 41 is formed between the isolation diaphragm 34 and the first diaphragm 31. A second rear cavity 43 is formed between the second diaphragm 32 and the magnetic circuit system 2. A first front cavity 42 is formed between the isolation diaphragm 34 and the second diaphragm 32. The first outer shell 11 is provided with a first front cavity sound hole 1121 communicating with the first front cavity 42 and a first rear cavity sound hole 1111 communicating with the first rear cavity 41.

[0031] The technical solution of the present invention connects the outer edge of the first diaphragm 31 to the end of the first outer shell 11 away from the second outer shell 12, and the outer edge of the second diaphragm 32 is sandwiched between the first outer shell 11 and the second outer shell 12. The magnetic circuit system 2 and two voice coils 33 are arranged on one side of the second diaphragm 32, and a bracket 36 is arranged on the other side of the second diaphragm 32. The two voice coils 33 are arranged corresponding to the two magnetic gaps of the magnetic circuit system 2, and both voice coils 33 are connected to the second diaphragm 32. The two ends of the bracket 36, which are arranged opposite each other along the first direction, are respectively connected to the first diaphragm 31 and the second diaphragm 32. Thus, when the two voice coils 33 drive the second diaphragm 32 to reciprocate along the first direction, the vibrating second diaphragm 32... The diaphragm 32 can transfer kinetic energy to the first diaphragm 31 through the bracket 36, thereby driving the first diaphragm 31 and the second diaphragm 32 to vibrate and produce sound together through the bracket 36. Compared with the case where the second diaphragm 32 is placed inside the housing 1, the technical solution of the present invention sandwiches the second diaphragm 32 between the first outer shell 11 and the second outer shell 12 arranged along the first direction, so that the area of ​​the second diaphragm 32 can break through the limitation of the internal space of the housing 1, effectively increasing the area of ​​the second diaphragm 32. The increase in the area of ​​the second diaphragm 32 increases the effective vibration area of ​​the second diaphragm 32, thereby increasing the effective vibration area of ​​the vibration system 3 without increasing the product size.

[0032] Furthermore, compared to stretching the first dome 312 toward the second dome 322, stretching the second dome 322 toward the first dome 312, and then connecting the two stretched parts, the technical solution of the present invention connects the first diaphragm 31 and the second diaphragm 32 respectively through the bracket 36, which effectively increases the stiffness of the first dome 312 and the second dome 322, making the first dome 312 and the second dome 322 less prone to deformation, so as to be able to push more air, thereby effectively increasing the effective vibration area of ​​the first diaphragm 31 and the second diaphragm 32.

[0033] Among them, the dual voice coils 33 are used to drive the sound generation unit 100 by moving along the first direction. Compared with the single voice coil 33, the magnetic energy product of the flat magnetic circuit can be more fully utilized (the magnetic energy product is one of the most important performance parameters of permanent magnet materials, which represents the magnetic energy density that a unit volume of permanent magnet can store), thereby increasing the driving force of the voice coils 33 and improving the acoustic performance of the sound generation unit 100.

[0034] Furthermore, the first diaphragm 31 and the second diaphragm 32 vibrate in the same direction, which can radiate sound waves of the same phase outward, thereby effectively improving the volume and loudness of the sound-generating unit 100.

[0035] In addition, a first rear cavity 41 is formed between the isolation diaphragm 34 and the first diaphragm 31, a second rear cavity 43 is formed between the second diaphragm 32 and the magnetic circuit system 2, and a first front cavity 42 is formed between the isolation diaphragm 34 and the second diaphragm 32. The housing 1 is provided with a first front cavity sound hole 1121 communicating with the first front cavity 42 and a first rear cavity sound hole 1111 communicating with the first rear cavity 41, so that the total effective vibration area of ​​the sound-generating unit 100 is the sum of the effective vibration area of ​​the first diaphragm 31 and the effective vibration area of ​​the second diaphragm 32. Compared with the fact that the effective vibration area of ​​a single diaphragm is the total effective vibration area of ​​the entire loudspeaker, this application makes full use of the space inside the sound-generating unit 100, thereby increasing the effective vibration area of ​​the vibration system 3 without increasing the product size.

[0036] In a traditional loudspeaker, the front cavity is formed by a diaphragm and a housing, with one diaphragm and one housing. Sound is produced by the diaphragm driving the air inside the front cavity. In this embodiment, the sound-producing unit 100 adds an isolation diaphragm 34 and a second diaphragm 32 to the internal space of the original loudspeaker. This results in the sound-producing unit 100 having an additional first front cavity 42 compared to a traditional loudspeaker. At the same time, the first diaphragm 31 and the module housing 201 form a second front cavity 44. In this embodiment, the sound waves from the first diaphragm 31 and the second diaphragm 32 are radiated outward through the first front cavity 42 and the second front cavity 44 respectively and then combined to produce sound. This increases the effective vibration area of ​​the vibration system 3 without increasing the product size.

[0037] Furthermore, this application positions the second diaphragm 32 above the magnetic circuit system 2. Compared to earlier applications where the second diaphragm 32 was designed to surround the magnetic circuit, this increases the effective vibration area of ​​the second diaphragm 32, further improving sound performance. Simultaneously, the voice coil 33 is directly fixed to the second diaphragm 32, eliminating the need for an additional frame connection and improving the concentricity and vibration consistency of the voice coil 33 and the second diaphragm 32.

[0038] It should be noted that the number of voice coils 33 can be two or more, and there is no restriction here. The number of voice coils 33 is consistent with the number of magnetic gaps and is set one-to-one. The two voice coils 33 are the first voice coil 331 and the second voice coil 332, and the two magnetic gaps are the first magnetic gap 251 and the second magnetic gap 252. The first voice coil 331 is set to correspond to the first magnetic gap 251, and the second voice coil 332 is set to correspond to the second magnetic gap 252. Both voice coils 33 are connected to the second dome 322, which improves the stiffness of the second dome 322 so as to better transmit power to the first diaphragm 31.

[0039] It should also be noted that the bracket 36 is a rigid bracket, and its material can be metal or other high-hardness materials, without limitation. The number of brackets 36 can be one, two, or more, without limitation. The bracket 36 can be located between the first diaphragm 31 and the isolation diaphragm 34, with both ends of the bracket 36 along the first direction connected to the first diaphragm 31 and the isolation diaphragm 34 respectively. The other side of the isolation diaphragm 34 corresponding to the bracket 36 is connected to the second diaphragm 32. That is, one end of the bracket 36 is directly connected to the first diaphragm 31, and the other end of the bracket 36 is connected to the second diaphragm 32 through the isolation diaphragm 34. Alternatively, the bracket 36 can be located between the second diaphragm 32 and the isolation diaphragm 34, with both ends of the bracket 36 along the first direction connected to the second diaphragm 32 and the isolation diaphragm 34 respectively. Next, the isolation diaphragm 34 is connected to the first diaphragm 31 on the other side of the bracket 36. That is, one end of the bracket 36 is directly connected to the second diaphragm 32, and the other end of the bracket 36 is connected to the first diaphragm 31 through the isolation diaphragm 34. The bracket 36 can also pass through the isolation diaphragm 34. The isolation diaphragm 34 is provided with a through hole for the bracket 36 to pass through. The inner wall of the through hole is sealed to the outer wall of the bracket 36 to ensure that the first front cavity 42 and the first rear cavity 41 are not connected. The two ends of the bracket 36 along the first direction are directly connected to the first diaphragm 31 and the second diaphragm 32 respectively. There are no restrictions here.

[0040] Please see Figure 3 , Figure 5 and Figure 6 In one embodiment, the first diaphragm 31 includes a first folded ring 311 and a first dome 312. The first folded ring 311 forms a first through hole 3111, and the first dome 312 covers the first through hole 3111. The second diaphragm 32 includes a second folded ring 321 and a second dome 322. The second folded ring 321 forms a second through hole 3211, and the second dome 322 covers the second through hole 3211. One end of the bracket 36 is connected to the first dome 312, and the other end of the bracket 36 is connected to the second dome 322. The two ends of the bracket 36, which are arranged opposite to each other along the first direction, are respectively connected to the first dome 312 and the second dome 322, thereby effectively increasing the stiffness of the first dome 312 and the second dome 322. This makes the first dome 312 and the second dome 322 less prone to deformation during vibration, thereby driving more air movement and increasing the effective vibration area of ​​the first diaphragm 31 and the second diaphragm 32.

[0041] Please see Figure 6 and Figure 7In one embodiment, the inner connecting portion 343 is sandwiched between the end of the bracket 36 away from the first diaphragm 31 and the second diaphragm 32. Specifically, the inner connecting portion 343 is sandwiched between the end of the bracket 36 away from the first diaphragm 31 and the second dome 322. One side of the inner connecting portion 343 is bonded to the end of the bracket 36 away from the first diaphragm 31, and the other side of the inner connecting portion 343 is bonded to the second dome 322, ensuring synchronous vibration and sound generation of the second diaphragm 32 and the first diaphragm 31.

[0042] Please see Figure 4 , Figure 6 and Figure 7 In one embodiment, the first outer shell 11 includes a first shell body 111 and a second shell body 112 stacked along a first direction. The end of the first shell body 111 away from the second shell body 112 is connected to the outer edge of the first diaphragm 31. The second diaphragm 32 is sandwiched between the second shell body 112 and the second outer shell 12. The outer connecting part 341 is connected to the second shell body 112. The first diaphragm 31, the first shell body 111, the second shell body 112 and the isolation diaphragm 34 form a first rear cavity 41. The second shell body 112, the isolation diaphragm 34 and the second diaphragm 32 form a first front cavity 42. The side wall of the first shell body 111 is provided with a first rear cavity sound hole 1111 and the side wall of the second shell body 112 is provided with a first front cavity sound hole 1121. The first outer shell 11 is formed by welding or bonding a first shell body 111 and a second shell body 112. The first shell body 111 forms the first rear cavity 41, and the second shell body 112 forms the first front cavity 42. The use of the first shell body 111 and the second shell body 112 facilitates the formation and separation of the first rear cavity 41 and the first front cavity 42, ensuring that the first front cavity 42 and the first rear cavity 41 are not interconnected. It should be noted that the contact point between the first shell body 111 and the second shell body 112 can achieve a waterproof seal.

[0043] Please see Figure 4 and Figure 7 In one embodiment, the first rear cavity acoustic hole 1111 is located on multiple sides of the first shell body 111, and the first front cavity acoustic hole 1121 is located on one side of the second shell body 112. The first front cavity acoustic hole 1121 and the first rear cavity acoustic hole 1111 are located on different sides of the first shell body 11. Specifically, the first front cavity acoustic hole 1121 is provided on one side of the second shell body 112. Along the circumference of the first shell body 111, the first rear cavity acoustic hole 1111 is provided on the remaining sides of the first shell body 111, except for the side on the same side as the second shell body 112 where the first front cavity acoustic hole 1121 is provided. The first front cavity acoustic hole 1121 and the first rear cavity acoustic hole 1111 are not coplanar to avoid mutual interference of the anti-phase sound waves radiated by the first front cavity acoustic hole 1121 and the first rear cavity acoustic hole 1111.

[0044] In one embodiment, the sound-generating unit 100 is further provided with a second rear cavity 43 sound hole communicating with the second rear cavity 43; wherein, the second rear cavity 43 sound hole can be disposed in the magnetic circuit system 2, or in the housing 1, or between the magnetic circuit system 2 and the housing 1. It should be noted that the shape of the sound hole can be circular, rectangular, or elliptical, and no specific limitation is made here.

[0045] Please see Figure 7 In one embodiment, the second shell body 112 includes an isolation top plate 1122 and a shell side wall 1123 connected to the periphery of the isolation top plate 1122. The second diaphragm 32 is sandwiched between the shell side wall 1123 and the second shell 12. A third through hole 1124 is formed in the middle of the isolation top plate 1122. An external connecting part 341 is connected to the isolation top plate 1122, and the isolation diaphragm 34 covers the third through hole 1124. The second shell body 112 includes an isolation top plate 1122 and a shell side wall 1123 connected to the periphery of the isolation top plate 1122. The isolation top plate 1122 is used to connect to the side of the external connecting part 341 facing the second diaphragm 32, thereby effectively supporting the isolation diaphragm 34. The isolation top plate 1122 has a third through hole 1124, and the isolation diaphragm 34 covers the third through hole 1124, ensuring that the first front cavity 42 and the first rear cavity 41 are not interconnected. It should be noted that the isolation top plate 1122 and the shell side wall 1123 can be integrally formed, or the isolation top plate 1122 can be welded to the shell side wall 1123, or the isolation top plate 1122 can be bonded to the shell side wall 1123; no limitation is made here. By setting the isolation top plate 1122 to fix the isolation diaphragm 34, the isolation top plate 1122 and the first shell body 111 respectively support the isolation diaphragm 34 and the first diaphragm 31, which can free up the height design of the shell 1, and at the same time make the installation of the two diaphragms easier.

[0046] In one embodiment, the first shell body 111, the second shell body 112, and the second outer shell 12 are all made of metal. The shell 1 also includes a metal connector 13, which is welded to the first shell body 111 and the second outer shell 12, or the metal connector 13 is welded to all of them. The metal connector 13 connects the first outer shell 11 and the second outer shell 12, thereby increasing the connection strength between them and making them difficult to separate. Specifically, the metal connector 13 can be welded to the first shell body 111 and the second outer shell 12, or it can be welded to the second shell body 112 and the second outer shell 12, or all of them can be welded to the metal connector 13. This not only improves the connection strength between the first outer shell 11 and the second outer shell 12, but also improves the connection strength between the first shell body 111 and the second shell body 112.

[0047] Please see Figure 11 and Figure 12In one embodiment, there are multiple first shells 11, which are stacked sequentially along a first direction. The number of first diaphragms 31 is the same as that of the first shells 11 and they are arranged in a one-to-one correspondence. A first diaphragm 31 is connected to the end of a first shell 11 away from the second shell 12. The first shell 11 that is close to the second shell 12 among the multiple first shells 11 is defined as the bottom shell, and the remaining first shells 11 are stacked shells. The second diaphragm 32 is sandwiched between the bottom shell and the second shell 12. The number of brackets 36 and isolation diaphragms 34 is the same as that of the first shells 11 and they are arranged in a one-to-one correspondence. The brackets 36 are also used to connect adjacent first diaphragms 31 arranged in the corresponding stacked shells. An isolation diaphragm 34 is arranged between any two adjacent first diaphragms 31. The isolation diaphragm 34 divides the space between two adjacent first diaphragms 31 into an auxiliary front cavity 45 and an auxiliary rear cavity 46. The stacked shells have an auxiliary front cavity acoustic hole 1125 communicating with the auxiliary front cavity 45 and an auxiliary rear cavity acoustic hole 1112 communicating with the auxiliary rear cavity 46. By stacking multiple first shells 11, each first shell 11 has a corresponding first diaphragm 31, and the number of brackets 36 and isolation diaphragms 34 is also consistent with the number of first shells 11 and are arranged one-to-one. This allows the isolation diaphragm 34 located between any two adjacent first diaphragms 31 to divide the space between these two first diaphragms 31 into an auxiliary front cavity 45 and an auxiliary rear cavity 46. The stacked shells are provided with auxiliary front cavities 45 and auxiliary rear cavities 46. In this case, the effective vibration area of ​​the sound-generating unit 100 is the sum of the effective vibration areas of all the first diaphragms 31 and the second diaphragms 32, which effectively increases the effective vibration area of ​​the sound-generating unit 100. The stacked shells and the first diaphragms 31, brackets 36 and isolation diaphragms 34 that are adapted to them can act as an expansion module, so that users can increase or decrease the number of stacked shells according to actual needs to adapt to the installation space requirements or meet the requirements for the effective vibration area of ​​the sound-generating unit 100, which has high flexibility and applicability. Meanwhile, with the thickness of the sound-generating unit 100 being uniform along the first direction, compared to traditional single-diaphragm or dual-diaphragm solutions, the technical solution of the present invention, through the stacked arrangement of multiple first outer shells 11 and the corresponding first diaphragms 31, supports 36, and isolation diaphragms 34, further increases the effective vibration area of ​​the sound-generating unit 100. It should be noted that the support 36 corresponding to the stacked outer shells is located between two adjacent first diaphragms 31. The end of the support 36 away from the second diaphragm 32 is bonded to the first diaphragm 31 above it, while the end of the support 36 facing the second diaphragm 32 is bonded to the side of the isolation diaphragm 34 corresponding to the stacked support 36 away from the second diaphragm 32. The other side of the isolation diaphragm 34 is bonded to another first diaphragm 31 located below the support 36, thereby ensuring synchronous vibration of the two adjacent first diaphragms 31.

[0048] It should be noted that an auxiliary front cavity acoustic hole 1125 communicating with the auxiliary front cavity 45 is provided on one side of the stacked shell in the circumferential direction, and an auxiliary rear cavity acoustic hole 1112 communicating with the auxiliary rear cavity 46 is provided on other sides of the stacked shell in the circumferential direction, thereby avoiding mutual communication between the auxiliary front cavity 45 and the auxiliary rear cavity 46, and thus avoiding mutual interference between the anti-phase sound waves radiated by the auxiliary front cavity acoustic hole 1125 and the auxiliary rear cavity acoustic hole 1112.

[0049] Please see Figure 3 , Figure 6 and Figure 7 In one embodiment, the first diaphragm 31 includes a first folded ring 311 and a first dome 312 disposed at the center of the first folded ring 311, and the second diaphragm 32 includes a second folded ring 321 and a second dome 322 disposed at the center of the second folded ring 321; wherein, the bracket 36 and the first dome 312 are integrally formed, and the bracket 36 is formed by stretching from the middle of the first dome 312 toward the direction close to the second diaphragm 32; or, the bracket 36 and the first dome 312 are bonded together by a first adhesive layer. The bracket 36 can be formed by stretching from the middle of the first dome 312 toward the direction close to the second diaphragm 32, and the first dome 312 and the first bracket 36 can be assembled and produced as a single component, thus facilitating manufacturing; the bracket 36 can also be connected to the first dome 312 by the first adhesive layer, achieving a reliable connection between the two independent structural components. It should be noted that the end of the bracket 36 away from the first diaphragm 31 is connected to one side of the inner connecting part 343 through the second adhesive layer, and the other side of the inner connecting part 343 that is in direct contact with the bracket 36 is connected to the middle of the second dome 322 through the third adhesive layer, so as to ensure that the first diaphragm 31 and the second diaphragm 32 vibrate synchronously to produce sound.

[0050] In one embodiment, the support 36 is bonded to the first dome 312 via a first adhesive layer. The support 36 includes an extension 361, a gradually expanding portion 362, and a fitting portion 363 arranged and connected sequentially along a first direction. The extension 361 extends along the first direction, and one end of the extension 361 away from the gradually expanding portion 362 is connected to the second dome 322. The cross-sectional dimension of the gradually expanding portion 362 along the first direction is gradually widened from the end connected to the extension 361 in a direction away from the second diaphragm 32. The fitting portion 363 is formed by bending outward from the end of the gradually expanding portion 362 away from the extension 361, and the fitting portion 363 is bonded to the first dome 312. The extension 361 extends along the first direction to avoid interference between the expanding portion 362 and the vibrating isolation diaphragm 34. By providing the expanding portion 362 and the fitting portion 363, the contact area between the first dome 312 and the support 36 is effectively increased, improving the connection strength between the support 36 and the first dome 312, and also effectively enhancing the stiffness of the first dome 312. This improves the vibration stability of the vibration system 3 and prevents or reduces the probability of polarization phenomena. It should be noted that the fitting portion 363 is connected to the first dome 312, the end of the extension 361 away from the expanding portion 362 is connected to the isolation diaphragm 34, and the other side of the isolation diaphragm 34 corresponding to the extension 361 is connected to the second dome 322.

[0051] According to one embodiment of the present invention, the support 36 is a thin-walled support 36; wherein the use of a thin-walled support 36 can effectively reduce the weight of the support 36, thereby reducing the energy loss caused by driving the support 36 to move.

[0052] According to another embodiment of the present invention, the extension portion 361, the expanding portion 362, and the fitting portion 363 form an opening groove 364, and the first diaphragm 31 covers the opening of the opening groove 364; wherein the extension portion 361, the expanding portion 362, and the fitting portion 363 form the opening groove 364, which, compared to a solid bracket 36 or a support block, further reduces the mass of the bracket 36 through this hollow structure, thereby reducing the energy loss caused by driving the movement of the bracket 36. The opening of the opening groove 364 is covered by a first dome 312.

[0053] The bonding portion 363 is connected to the first diaphragm 31 through a first adhesive layer; the bonding portion 363 is connected to the first dome 312 through the first adhesive layer, realizing a reliable connection between the two independent structural components, the bracket 36 and the first dome 312; in addition, the end of the extension portion 361 away from the gradually expanding portion 362 is connected to the isolation diaphragm 34 through a second adhesive layer, and the other side of the isolation diaphragm 34 corresponding to the extension portion 361 is connected to the second dome 322 through a third adhesive layer.

[0054] Please see Figure 6 and Figure 7Furthermore, the end of the extension 361 away from the expanding portion 362 has a connecting plane 3611, which is connected to the second diaphragm 32. The end of the extension 361 away from the expanding portion 362 has a connecting plane 3611, which is connected to the isolation diaphragm 34. The other side of the isolation diaphragm 34 corresponding to the connecting plane 3611 is connected to the second diaphragm 32. Specifically, the other side of the isolation diaphragm 34 corresponding to the connecting plane 3611 is connected to the second dome 322. The connection is made by surface contact, which can obtain a larger contact area compared with point contact or line contact, thereby effectively improving the connection strength between the bracket 36 and the isolation diaphragm 34. Furthermore, since the isolation diaphragm 34 is connected to the connecting plane 3611, after the isolation diaphragm 34 is connected to the connecting plane 3611, the side of the isolation diaphragm 34 away from the bracket 36 also forms a flat plane, so that the isolation diaphragm 34 can be connected to the second dome 322, ensuring that the isolation diaphragm 34 and the second dome 322 have a large contact area, thereby improving the connection strength between the isolation diaphragm 34 and the second dome 322.

[0055] Please see Figure 7 and Figure 8 In one embodiment, the magnetic circuit system 2 includes a magnetic yoke 21 and a central magnet assembly 22 and a side magnet assembly 23 disposed on the magnetic yoke 21. The side magnet assembly 23 includes a first side magnet 231 and two second side magnets 232 disposed on both sides of the first side magnet 231 along a second direction. The central magnet assembly 22 includes two central magnets 221 disposed between the first side magnet 231 and the second side magnets 232. The first side magnet 231, the second side magnets 232 and the central magnets 221 are all spaced apart from each other. Two magnetic gaps are respectively arranged around the two central magnets 221. The second direction is the short axis direction of the voice coil 33, and the two voice coils 33 are arranged side by side along the second direction. Compared with the case where the two voice coils 33 are nested, the two voice coils 33 in this embodiment are arranged side by side along the second direction, which requires fewer magnets to be split. That is, this embodiment does not need to split a large number of magnets to form magnetic gaps. Therefore, the magnet utilization rate is higher, which helps to reduce the size of the magnetic circuit system 2 and meets the development trend of miniaturization of the sound-generating unit 100. It should be noted that by setting the magnetic yoke 21, on the one hand, reliable support is provided for the center magnet assembly 22 and the side magnet assembly 23, and on the other hand, the magnetic field lines of the center magnet assembly 22 and the side magnet assembly 23 are guided, allowing more magnetic field lines to pass through the magnetic gap, thereby increasing the driving force on the voice coil 33. It should also be noted that the first direction is... Figure 13 The vertical direction is shown, and the second direction is... Figure 13 The left and right directions are shown.

[0056] In addition, the second direction is the short axis direction of the voice coil 33, that is, the two second side magnets 232 are arranged on both sides of the first side magnet 231 along the short axis direction of the voice coil 33. The two second side magnets 232 and the first side magnet 231 are arranged side by side along the short axis direction of the voice coil 33. The two center magnets 221 are also arranged side by side along the short axis direction of the voice coil 33, so that the first side magnet 231, the second side magnet 232 and the center magnet 221 can correspond to the long axis of the voice coil 33. That is, the length direction of the first side magnet 231, the second side magnet 232 and the center magnet 221 is arranged to correspond to the long axis direction of the voice coil 33, so that more magnetic field lines interact with the long axis of the voice coil 33, thereby effectively improving the BL value (the BL value is the product of the magnetic field strength B of the coil gap and the length L of the voice coil wire).

[0057] Please see Figure 8 In one embodiment, the first side magnet 231 includes a central portion 2311 and end portions 2312 respectively disposed at both ends of the central portion 2311 along the long axis of the voice coil 33. The end portions 2312 extend along a second direction. The central portion 2311 is disposed opposite to the long axis of the voice coil 33, and the end portions 2312 are disposed opposite to the short axis of the voice coil 33. The two ends of each end portion 2312 disposed opposite to each other along the second direction are a first end and a second end, respectively. The first end extends along the second direction in a direction away from the second end, and the second end extends along the second direction in a direction away from the first end, thereby guiding more magnetic field lines through the corner segment and the short axis of the voice coil 33, thereby increasing the driving force of the voice coil 33.

[0058] Please see Figure 2 , Figure 8 and Figure 9 In one embodiment, the magnetic yoke 21 includes a yoke body 211 and a positioning plate 213 formed by bending and extending the edge of the yoke body 211 toward the side where the vibration system 3 is located. The second outer shell 12 is provided with a positioning hole for inserting the positioning plate 213, and the positioning plate 213 is tightly fitted with the hole wall. In this embodiment, by setting the positioning plate 213 to be inserted into the positioning hole and tightly fitted with the hole wall, the magnetic yoke 21 and the second outer shell 12 are positioned and connected, thereby ensuring that the magnetic circuit system 2 and the voice coil 33 have suitable concentricity. The positioning hole can also be used as the sound hole of the second rear cavity 43, that is, in addition to being used for inserting the positioning plate 213, the positioning hole can also be used as the sound hole of the second rear cavity 43, thereby enriching the function of the positioning hole and simplifying the structural design of the sound generating device.

[0059] Please see Figure 2According to one embodiment of the present invention, the magnetic yoke 21 further includes a magnetically guided protrusion 212 disposed on the side of the yoke body 211 away from the magnetic circuit system 2. The magnetically guided protrusion 212 is located in the middle of the yoke body 211, so that the exposed surface of the side of the yoke body 211 away from the second diaphragm 32 forms a steel mesh mounting surface 2121, which is used to connect with a steel mesh. The presence of the steel mesh mounting surface 2121 facilitates the installation of the steel mesh. By installing the steel mesh, external impurities can be effectively isolated from entering the interior of the housing 1 and the magnetic gap. The yoke body 211, the magnetically guided protrusion 212, and the positioning plate 213 are integrally formed parts, thereby facilitating the assembly of the sound-generating unit 100.

[0060] Please see Figure 8 In one embodiment, the magnetic yoke 21 has a clearance groove 2111 on the side facing the voice coil 33 to avoid interference with the voice coil 33. The number of clearance grooves 2111 is the same as the number of voice coils 33 and they are arranged one-to-one. The clearance grooves 2111 on the magnetic yoke 21 ensure that the voice coil 33 has sufficient vibration space and avoids interference between the magnetic yoke 21 and the voice coil 33. It should be noted that the shape of the clearance groove 2111 is adapted to the shape of the voice coil 33.

[0061] Please see Figure 7 and Figure 8 In one embodiment, the shape of the magnetic yoke 21 is adapted to the shapes of the side magnet assembly 23 and the center magnet assembly 22. The shape of the yoke body 211 is adapted to the shapes of the side magnet assembly 23 and the center magnet assembly 22 to avoid the outer contour of the yoke body 211 protruding from the side magnet assembly 23, which would increase the size of the entire sound-generating unit 100; at the same time, it ensures that the yoke body 211 can smoothly guide the magnetic field lines of the side magnet assembly 23 and the center magnet assembly 22.

[0062] Please see Figure 7 and Figure 8 In one embodiment, the magnetic circuit system 2 further includes a magnetic guide plate assembly 24, which includes a first side magnetic guide plate 241 disposed on the side of the first side magnet 231 away from the magnetic guide yoke 21, a second side magnetic guide plate 242 disposed on the side of the second side magnet 232 away from the magnetic guide yoke 21, and a central magnetic guide plate 243 disposed on the side of the central magnet 221 away from the magnetic guide yoke 21. By setting the first side magnetic guide plate 241, the magnetic field lines of the first side magnet 231 are guided and corrected; by setting the second side magnetic guide plate 242, the magnetic field lines of the second side magnet 232 are guided and corrected; and by setting the central magnetic guide plate 243, the magnetic field lines of the central magnet 221 are guided and corrected, thereby allowing more magnetic field lines to pass through the magnetic gap and improving the sensitivity of the sound-generating unit 100.

[0063] Among them, the first side magnetic plate 241, the second side magnetic plate 242 and the second outer shell 12 are integrally formed parts, and the first outer shell 11 and the second outer shell 12 are both metal shells; the first outer shell 11 and the second outer shell 12 can be metal shells, and the first side magnetic plate 241, the second side magnetic plate 242 and the first outer shell 11 are integrally formed parts, which has the advantages of easy molding and low cost, and is easy to assemble, which can effectively improve the assembly efficiency of the sound generating unit 100.

[0064] Please see Figure 7 and Figure 8 In one embodiment, the shape of the first side magnetic plate 241 is adapted to the shape of the first side magnet 231. This adaptation prevents the first side magnetic plate 241 from excessively occupying the internal space within the first housing 11, thereby avoiding interference with the voice coil 33. Similarly, the shape of the second side magnetic plate 242 is adapted to the shape of the second side magnet 232; the shape of the central magnetic plate 243 is also adapted to the shape of the central magnet 221.

[0065] Please see Figure 4 According to one embodiment of the present invention, the vibration system 3 further includes a centering support 35, one end of which is connected to the housing 1, and the other end of which is connected to the voice coil 33. The centering support 35 includes two parts, which are respectively arranged on both sides of the voice coil 33 along the long axis direction. The centering support 35 includes a first fixing part 351, a cantilever part 353 and a second fixing part 352 connected in sequence. The number of first fixing parts 351 is the same as the number of voice coils 33 and they are arranged in a one-to-one correspondence. The number of cantilever parts 353 is the same as the number of first fixing parts 351 and they are arranged in a one-to-one correspondence. The first fixing parts 351 are connected to the voice coil 33 and the second fixing parts 352 are connected to the housing 1. One end of the two voice coils 33 along their long axis direction is connected to the two first fixing parts 351 of the centering support 35 in a one-to-one correspondence. The other end of the two voice coils 33 along their long axis direction is connected to the two first fixing parts 351 of the other centering support 35 in a one-to-one correspondence. This ensures that the voice coil 33 is centered and reduces the probability of the voice coil 33 being radially offset.

[0066] It should be noted that the magnetic circuit system 2 has a clearance notch 26 to avoid interference between the magnetic circuit system 2 and the centering support 35.

[0067] Please see Figure 6 and Figure 7In one embodiment, the outer surfaces of the first outer shell 11, the second outer shell 12, and the magnetic circuit system 2 are substantially flush, and the outer peripheries of the first diaphragm 31 and the second diaphragm 32 are substantially flush. One end of the first outer shell 11 is connected to the outer edge of the first diaphragm 31 for fixing the outer edge of the first diaphragm 31, and the other end of the first outer shell 11 cooperates with the second outer shell 12 to clamp the second diaphragm 32. The substantially flush outer peripheries of the first diaphragm 31 and the second diaphragm 32 allow the edge of the second dome 322 to expand outwards, making the size of the second dome 322 similar to that of the first dome 322. Since the dimensions of 312 are basically the same, the effective vibration area of ​​the second diaphragm 32 is effectively increased. Since the dimensions of the first dome 312 and the second dome 322 of the first diaphragm 31 are basically the same, and the outer periphery of the first diaphragm 31 and the outer periphery of the second diaphragm 32 are roughly flush, the dimensions of the first fold ring 311 and the second fold ring 321 are also basically the same. Therefore, the first fold ring 311 and the second fold ring 321 can be made into a standard part, and the first fold ring 311 and the second fold ring 321 can be produced using the same mold, thereby saving the cost of the mold and the manufacturing cost.

[0068] Furthermore, the outer surface of the magnetic circuit system 2 can be flush with the outer surfaces of the first outer shell 11 and the second outer shell 12, which means approximately flush. This includes the outer surfaces of the first outer shell 11 and the second outer shell 12 being slightly protruding outwards compared to the outer surface of the magnetic circuit system 2, or the outer surface of the magnetic circuit system 2 being slightly protruding outwards compared to the outer surfaces of the first outer shell 11 and the second outer shell 12. This facilitates maximizing the size of the magnetic circuit system 2. Increasing the size of the magnetic circuit system 2 helps to enhance the magnetic field, thereby improving the sensitivity of the sound-generating unit 100, that is, improving the acoustic performance of the sound-generating unit 100.

[0069] Please see Figure 4 and Figure 7 In one embodiment, along the circumference of the first outer shell 11, a plurality of first front cavity acoustic holes 1121 are provided on one side of the first outer shell 11, and a plurality of first rear cavity acoustic holes 1111 are provided on the remaining side of the first outer shell 11. Specifically, one side of the second shell body 112 is provided with the first front cavity acoustic hole 1121, and along the circumference of the first shell body 111, the first rear cavity acoustic holes 1111 are provided on the remaining side of the second shell body 112 except for the side on the same side as the side where the first front cavity acoustic hole 1121 is provided. The first front cavity acoustic hole 1121 and the first rear cavity acoustic hole 1111 are not coplanarly arranged to avoid mutual interference of the anti-phase sound waves radiated by the first front cavity acoustic hole 1121 and the first rear cavity acoustic hole 1111.

[0070] Please see Figure 10According to another embodiment of the present invention, the first dome 312 includes a first connecting portion 3121 and a first convex hull 3122 arranged sequentially from the outside to the inside. The first connecting portion 3121 is connected to the first folded ring 311, and the first convex hull 3122 protrudes in a direction away from the second diaphragm 32 along a first direction. The second dome 322 includes a second connecting portion 3221 and a second convex hull 3222 arranged sequentially from the outside to the inside. The second connecting portion 3221 is connected to the second folded ring 321, and the second convex hull 3222 protrudes in a direction away from the magnetic circuit system 2 along a first direction. The side of the bracket 36 away from the second diaphragm 32 is connected to the first convex shroud 3122, and the side of the isolation diaphragm 34 away from the first diaphragm 31 is connected to the second convex shroud 3222. The first convex shroud 3122 enhances the stiffness of the first dome 312, making it less prone to deformation, thereby allowing more air to be pushed and increasing the effective vibration area of ​​the first diaphragm 31. Similarly, the second convex shroud 3222 enhances the stiffness of the second dome 322, making it less prone to deformation, thereby increasing the effective vibration area of ​​the second diaphragm 32. It should be noted that the inner connecting portion 343, with its two sides arranged opposite each other along the first direction, is connected to the connecting plane 3611 and the second convex shroud 3222 respectively.

[0071] Please see Figure 13 and Figure 14 The present invention also proposes a sound-generating module 200, which includes a module housing 201 and the aforementioned sound-generating unit 100. The module housing 201 includes a main body 202 and a sound-emitting part 203 located on the side of the main body 202. The main body 202 is located on one side of the sound-generating unit 100, and the main body 202 is connected to the sound-generating unit 100 and forms a second front cavity 44 between the main body 202 and the first diaphragm 31. The sound-emitting part 203 communicates with the second front cavity 44 and the first front cavity sound hole 1121. The sound-generating module 200 includes a module housing 201 and a sound-generating unit 100. The specific structure of the sound-generating unit 100 is as described in the above embodiments. Since the sound-generating module 200 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.

[0072] After the module housing 1 is assembled with the sound-emitting unit 100, it can be installed as a whole component into the housing 1 of the sound-emitting module 200, which facilitates assembly. The module housing 201 includes a main body 202 and a sound-emitting part 203 located on the side of the main body 202. The main body 202 and the sound-emitting part 203 together form the front shell. As a semi-module structure, it reduces the overall height of the sound-emitting module 200. On the other hand, the first rear cavity 41 and the second rear cavity 43 can be directly connected to the cavity of the sound-emitting module 200. After the sound-emitting module 200 is installed in the electronic device, this setting can use the rear cavity of the entire electronic device as the rear cavity of the sound-emitting module 200, which effectively improves the sensitivity of the sound-emitting unit 100 and also weakens the vibration resistance of the vibration system 3, which also effectively improves the sensitivity of the sound-emitting unit 100. It should be noted that the sound outlet 203 is provided with a sound outlet hole 2031, which is oriented towards the first front cavity sound hole 1121 and the second front cavity 44, so that the first front cavity 42 and the second front cavity 44 emit sound from the same side, ensuring the consistency of the sound emission direction. The number of sound outlet holes 2031 is at least one, and the number of sound outlet holes 2031 can be two.

[0073] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A sound-generating monomer, characterized in that, include: A housing, the housing comprising a first outer shell and a second outer shell arranged along a first direction; A magnetic circuit system, the magnetic circuit system being connected to the second housing, the magnetic circuit system forming at least two magnetic gaps; A vibration system includes two voice coils, a support, and a first diaphragm, an isolation diaphragm, and a second diaphragm arranged sequentially and spaced apart along a first direction. The outer edge of the first diaphragm is connected to the end of the first housing away from the second housing. The outer edge of the second diaphragm is sandwiched between the first housing and the second housing. The voice coils and the magnetic circuit system are located on the side of the second diaphragm away from the first diaphragm. Each voice coil is arranged corresponding to its respective magnetic gap, and the two voice coils are connected to the second diaphragm. The isolation diaphragm includes an outer connecting portion, a folded loop portion, and an inner connecting portion arranged sequentially from the outside to the inside. The outer connecting portion is connected to the first housing. The bracket extends along the first direction, one end of the bracket is connected to the first diaphragm, the other end of the bracket is connected to the second diaphragm, and the inner connecting portion is connected to the bracket; wherein... A first rear cavity is formed between the isolation diaphragm and the first diaphragm, a second rear cavity is formed between the second diaphragm and the magnetic circuit system, and a first front cavity is formed between the isolation diaphragm and the second diaphragm. The first housing is provided with a first front cavity acoustic hole communicating with the first front cavity and a first rear cavity acoustic hole communicating with the first rear cavity.

2. The sound-generating unit as described in claim 1, characterized in that, The first diaphragm includes a first folded ring and a first dome, the first folded ring having a first through hole and the first dome covering the first through hole; the second diaphragm includes a second folded ring and a second dome, the second folded ring having a second through hole and the second dome covering the second through hole, one end of the bracket being connected to the first dome and the other end of the bracket being connected to the second dome; And / or, the inner connecting portion is sandwiched between the end of the bracket away from the first diaphragm and the second diaphragm.

3. The sound-generating unit as described in claim 1, characterized in that, The first outer shell includes a first shell body and a second shell body stacked along the first direction. The end of the first shell body away from the second shell body is connected to the outer edge of the first diaphragm. The second diaphragm is sandwiched between the second shell body and the second outer shell. The outer connecting part is connected to the second shell body. The first diaphragm, the first shell body, the second shell body and the isolation diaphragm form the first rear cavity. The second shell body, the isolation diaphragm and the second diaphragm form the first front cavity. The side wall of the first shell body is provided with the first rear cavity acoustic hole, and the side wall of the second shell body is provided with the first front cavity acoustic hole.

4. The sound-generating unit as described in claim 3, characterized in that, The first rear cavity acoustic hole is located on multiple sides of the first shell body, the first front cavity acoustic hole is located on one side of the second shell body, and the first front cavity acoustic hole and the first rear cavity acoustic hole are located on different sides of the first shell body. And / or, the sound-generating unit is further provided with a second rear cavity sound hole communicating with the second rear cavity; And / or, the second shell body includes an isolation top plate and a shell side wall connected to the periphery of the isolation top plate, the second diaphragm is sandwiched between the shell side wall and the second shell; a third through hole is opened in the middle of the isolation top plate, the outer connecting part is connected to the isolation top plate, and the isolation diaphragm covers the third through hole.

5. The sound-generating unit as described in claim 3, characterized in that, The first shell body, the second shell body, and the second outer shell are all made of metal. The shell also includes a metal connector, which is welded to the first shell body and the second outer shell, or the metal connector is welded to all three shell bodies.

6. The sound-generating unit as described in claim 1, characterized in that, The number of first shells is multiple, and the multiple first shells are stacked sequentially along the first direction. The number of first diaphragms is the same as the number of first shells and they are arranged in a one-to-one correspondence. One first diaphragm is connected to the end of a first shell away from the second shell. The first shell closest to the second shell among the multiple first shells is defined as the bottom shell, and the remaining first shells are stacked shells. The second diaphragm is sandwiched between the bottom shell and the second shell. The number of brackets and isolation diaphragms is the same as the number of first shells and they are arranged in a one-to-one correspondence. The bracket is also used to connect adjacent first diaphragms corresponding to the stacked shells. An isolation diaphragm is arranged between any two adjacent first diaphragms. The isolation diaphragm divides the space between two adjacent first diaphragms into an auxiliary front cavity and an auxiliary rear cavity. The stacked shells have auxiliary front cavity acoustic holes communicating with the auxiliary front cavity and auxiliary rear cavity acoustic holes communicating with the auxiliary rear cavity.

7. The sound-generating unit as described in any one of claims 1 to 6, characterized in that, The first diaphragm includes a first folded ring and a first dome disposed at the center of the first folded ring; the second diaphragm includes a second folded ring and a second dome disposed at the center of the second folded ring; wherein, The bracket and the first dome are integrally molded components, and the bracket is formed by stretching from the middle of the first dome toward the direction close to the second diaphragm; or, the bracket and the first dome are bonded together by a first adhesive layer.

8. The sound-generating unit as described in claim 7, characterized in that, The bracket is bonded to the first dome via a first adhesive layer. The bracket includes an extension, a gradually expanding portion, and a fitting portion arranged and connected sequentially along the first direction. The extension extends along the first direction, and one end of the extension away from the gradually expanding portion is connected to the second dome. The cross-sectional dimensions of the gradually expanding portion along the first direction are gradually widened from the end connected to the extension in a direction away from the second diaphragm. The fitting portion is formed by bending and extending the gradually expanding portion outward from the end away from the extension, and the fitting portion is bonded to the first dome.

9. The sound-generating unit as described in any one of claims 1 to 6, characterized in that, The magnetic circuit system includes a magnetic yoke and a central magnet assembly and a side magnet assembly disposed on the magnetic yoke. The side magnet assembly includes a first side magnet and two second side magnets disposed on both sides of the first side magnet along a second direction. The central magnet assembly includes two central magnets disposed between the first side magnet and the second side magnets. The first side magnet, the second side magnet and the central magnet are all spaced apart from each other. The two magnetic gaps are respectively disposed around the two central magnets. The second direction is the short axis direction of the voice coil. The two voice coils are arranged side by side along the second direction.

10. The sound-generating unit as described in claim 9, characterized in that, The first side magnet includes a central portion and end portions respectively disposed at both ends of the central portion along the long axis of the voice coil. The end portions extend along the second direction. The central portion is disposed opposite to the long axis of the voice coil, and the end portions are disposed opposite to the short axis of the voice coil. And / or, the magnetic yoke includes a yoke body and a positioning plate formed by bending and extending the edge of the yoke body toward the side where the vibration system is located, and the second housing is provided with a positioning hole for the positioning plate to be inserted, and the positioning plate is tightly fitted with the hole wall of the positioning hole; And / or, the magnetic yoke is provided with a clearance groove on the side facing the voice coil to avoid the voice coil, and the number of clearance grooves is the same as the number of voice coils and is provided in a one-to-one correspondence; And / or, the shape of the magnetic yoke is adapted to the shape of the side magnet assembly and the center magnet assembly.

11. The sound-generating unit as described in claim 9, characterized in that, The magnetic circuit system further includes a magnetic guide plate assembly, which includes a first side magnetic guide plate disposed on the side of the first side magnet away from the magnetic guide yoke, a second side magnetic guide plate disposed on the side of the second side magnet away from the magnetic guide yoke, and a central magnetic guide plate disposed on the side of the central magnet away from the magnetic guide yoke; wherein... The first side magnetic plate, the second side magnetic plate, and the second outer shell are integrally formed parts, and both the first outer shell and the second outer shell are metal shells; and / or, the shape of the first side magnetic plate is adapted to the shape of the first side magnet.

12. The sound-generating unit as described in any one of claims 1 to 6, characterized in that, The outer surfaces of the first outer shell, the second outer shell, and the magnetic circuit system are aligned, and the outer peripheries of the first diaphragm and the second diaphragm are aligned. And / or, along the circumferential direction of the first housing, a plurality of first front cavity acoustic holes are provided on one side of the first housing, and a plurality of first rear cavity acoustic holes are provided on the remaining side of the first housing. And / or, the sound-generating unit is further provided with a second rear cavity sound hole that communicates with the second rear cavity.

13. A sound-generating module, characterized in that, The sound-generating module includes a module housing and a sound-generating unit as described in any one of claims 1 to 12. The module housing 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 unit. The main body is connected to the sound-generating unit and forms a second front cavity between the main body and the first diaphragm. The sound-emitting part communicates with the second front cavity and the sound hole of the first front cavity.

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