Sound production monomer and sound production module
By using a dual voice coil design and a multi-chamber structure, the problem of limited effective sound-producing area of the loudspeaker was solved, and the effective area and acoustic performance of the vibration system were improved without increasing the size.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GOERTEK INC
- Filing Date
- 2026-04-30
- Publication Date
- 2026-06-02
Smart Images
Figure CN122138095A_ABST
Abstract
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, aiming to solve the technical problem of how to increase the effective vibration area of a vibration system without increasing the product size.
[0005] To achieve the above objectives, the present invention provides a sound-generating unit comprising: case; A magnetic circuit system, which is connected to the housing, forms two magnetic gaps; A vibration system, comprising a voice coil and a first diaphragm, an isolation diaphragm, and a second diaphragm sequentially spaced apart along a first direction in the housing; the voice coil and the magnetic circuit system are located on the side of the second diaphragm away from the first diaphragm; the voice coil comprises two voice coils, each corresponding to one of the two magnetic gaps, and the two voice coils are connected to the second diaphragm; The first diaphragm includes a first folded ring and a first dome. The first folded ring has a first through hole, and the first dome covers the first through hole. The first dome includes an integrally formed first connecting portion and a first extension portion. The first connecting portion is connected to the edge of the first through hole, and the first extension portion extends toward the second diaphragm. The second diaphragm includes a second folded ring and a second dome. The second folded ring has a second through-hole, and the second dome covers the second through-hole. The second dome includes an integrally formed second connecting portion and a second extension portion. The second connecting portion is connected to the edge of the second through-hole, and the second extension portion extends toward the first diaphragm. One end of the second extension portion away from the second connecting portion and the other end of the first extension portion away from the first connecting portion are respectively connected to both sides of the isolation diaphragm along the first direction. 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 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 isolation diaphragm includes an outer connecting portion, a folded ring portion, and an inner connecting portion arranged sequentially around the periphery. The outer edge of the outer connecting portion is connected to the housing. The side of the first extension portion away from the first connecting portion and the side of the second extension portion away from the second connecting portion are connected to both sides of the inner connecting portion along the first direction.
[0007] In one embodiment, the housing includes a housing body and a partition plate disposed within the housing body. The magnetic circuit system, the first diaphragm, and the second diaphragm are all connected to the housing body. The housing body is provided with a first rear cavity acoustic hole and a first front cavity acoustic hole. The partition plate forms a third through hole. The isolation diaphragm is connected to the partition plate and covers the third through hole. The housing body, the partition plate, the first diaphragm, and the isolation diaphragm form the first rear cavity. The housing body, the partition plate, the second diaphragm, and the isolation diaphragm form the first front cavity. The housing body, the second diaphragm, and the magnetic circuit system form the second rear cavity.
[0008] In one embodiment, the shell body includes a first outer shell and a second outer shell connected to each other. The partition plate and the second outer shell are disposed inside the first outer shell. One end of the first outer shell is connected to the outer edge of the first diaphragm, and the other end of the first outer shell is connected to the magnetic circuit system. The end of the first outer shell away from the first diaphragm has a clearance hole to avoid the voice coil. The magnetic circuit system is approximately flush with the outer surface of the first outer shell. The partition plate is located between the first diaphragm and the second outer shell. The outer edge of the second diaphragm is connected to the second outer shell. The first outer shell has a first front cavity acoustic hole and a first rear cavity acoustic hole.
[0009] In one embodiment, the shell body has a first side end and a second side end disposed opposite to each other along the first direction, at least the first side end is open, the first diaphragm is disposed on the first side end, and the magnetic circuit system is connected to the second side end; the shell body is stepped to form a first stepped surface facing the first side end in the inner cavity of the shell body, the second diaphragm is disposed in the shell body, and the edge of the second diaphragm is in contact with the first stepped surface, and the partition plate is located between the first diaphragm and the first stepped surface.
[0010] In one embodiment, the partition plate includes a plate body and a protrusion disposed in the center of the plate body, the third through hole penetrates the protrusion, the isolation diaphragm is connected to the protrusion, the outer edge of the plate body is connected to the inner wall of the shell body, the plate body, the protrusion and the shell body form a receiving groove for receiving a first sealing adhesive layer, and the partition plate is sealed to the shell body through the first sealing adhesive layer. And / or, the outer edge of the second diaphragm is sealed to the shell body through a second sealant layer; And / or, the frequency corresponding to the vibration mode of the partition plate is greater than the upper limit of the human hearing range; And / or, the inner wall of the shell body is provided with a plurality of supporting steps, and the side of the plurality of supporting steps facing the first diaphragm abuts against the side of the partition plate away from the first diaphragm to support the partition plate.
[0011] In one embodiment, the first extension and the first connecting portion form a first opening groove, the opening of the first opening groove faces away from the second diaphragm, the first opening groove communicates with the first through hole, the ratio of the width of the opening of the first opening groove along the second direction to the width of the first dome along the second direction is greater than or equal to 1:3; the ratio of the width of the opening of the first opening groove along the third direction to the width of the first dome along the third direction is greater than or equal to 1:3; the first direction, the second direction and the third direction are perpendicular to each other; And / or, the second extension and the second connecting portion form a second opening groove, the opening of the second opening groove faces away from the first diaphragm, the second opening groove communicates with the first through hole, the ratio of the width of the opening of the second opening groove along the second direction to the width of the second dome along the second direction is greater than or equal to 1:3; the ratio of the width of the opening of the second opening groove along the third direction to the width of the second dome along the third direction is greater than or equal to 1:3; the first direction, the second direction and the third direction are perpendicular to each other; And / or, the first extension portion forms a first connecting plane at one end facing the second extension portion, and the second extension portion forms a second connecting plane at one end facing the first extension portion, and the first connecting plane and the second connecting plane are respectively connected to both sides of the isolation diaphragm along the first direction; And / or, the cross-sectional dimensions of the first extension in the direction perpendicular to the first direction are gradually widened from the end closer to the second diaphragm to the end farther away from the second diaphragm; And / or, the cross-sectional dimensions of the second extension in the direction perpendicular to the first direction are gradually widened from the end closer to the first diaphragm to the end farther away from the first diaphragm; And / or, along the circumferential direction of the housing, a plurality of first front cavity acoustic holes are provided on one side of the housing, and a plurality of first rear cavity acoustic holes are provided on the remaining side of the housing; And / or, the sound-generating unit is further provided with a second rear cavity sound hole that communicates with the second rear cavity.
[0012] In one embodiment, the two voice coils are arranged side by side along a second direction, which is perpendicular to the first direction. 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 the 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 arranged around the two central magnets.
[0013] In one embodiment, the first side magnet includes a central portion and end portions disposed at both ends of the central portion, the end portions extending along the second direction, the central portion being disposed opposite to the major axis of the voice coil, and the end portions being disposed opposite to the minor axis of the voice coil; And / or, the magnetic yoke further 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, the 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.
[0014] 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 housing is a metal housing, and the first side magnetic plate and the second side magnetic plate are integrally formed with the housing; and / or, the shape of the first side magnetic plate is adapted to the shape of the first side magnet.
[0015] 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.
[0016] The technical solution of this invention involves placing two voice coils and a magnetic circuit system on the side of the second diaphragm away from the first diaphragm. The second extension of the second dome of the second diaphragm is connected to one side of the isolation diaphragm, and the first extension of the first dome of the first diaphragm is connected to the other side of the isolation diaphragm. This allows the two voice coils connected to the second diaphragm to drive the first and second diaphragms to vibrate together, 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 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-producing unit is the sum of the effective vibration areas of the first and second diaphragms. Compared to the previous approach 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, increasing the effective vibration area of the vibration system without increasing the product size. 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 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 5A 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, the isolation diaphragm, and the second diaphragm provided by the present invention; Figure 9 A schematic diagram of a structure of an embodiment of the first outer shell, the first side magnetic plate, and the second side magnetic plate provided by the present invention; Figure 10 An exploded structural diagram of an embodiment of the magnetic circuit system provided by the present invention; Figure 11 A cross-sectional schematic diagram of a portion of the structure of another embodiment of the sound-generating unit provided by the present invention; Figure 12 A cross-sectional structural schematic diagram of an embodiment of the sound-generating module provided by the present invention; Figure 13 An exploded structural diagram of an embodiment of the sound-generating module provided by the present invention; Figure 14 A cross-sectional structural schematic diagram of an embodiment of the sound-generating unit provided by the present invention; Figure 15 This is a cross-sectional view of another section of an embodiment of the sound-generating unit provided by the present invention.
[0019] Explanation of icon numbers: 100. Sound-generating unit; 1. Shell; 11. Shell body; 111. First outer shell; 1111. First rear cavity sound hole; 1112. First front cavity sound hole; 1113. Support step; 1114. Positioning hole; 112. Second outer shell; 113. First step surface; 114. Second side end; 12. Partition plate; 121. Plate body; 122. Protrusion; 1221. Third through hole; 1222. Receiving groove; 2. Magnetic circuit system; 21. Magnetic yoke; 211. Yoke Body; 2111, clearance groove; 212, magnetically conductive 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, center part; 2312, end part; 232, second side magnet; 24, magnetically conductive plate assembly; 241, first side magnetically conductive plate; 242, second side magnetically conductive plate; 243, central magnetically conductive plate; 251, first magnetic gap; 252, second magnetic gap 26. Gap; 3. Avoidance notch; 4. Vibration system; 31. First diaphragm; 311. First folded ring; 3111. First through hole; 312. First dome; 3121. First connecting part; 3122. First extension; 3123. First opening slot; 3124. First connecting plane; 32. Second diaphragm; 321. Second folded ring; 3211. Second through hole; 322. Second dome; 3221. Second connecting part; 3222. Second extension; 3223. Two slots; 3224, second connecting plane; 33, voice coil; 331, first voice coil; 332, second voice coil; 34, isolation diaphragm; 341, outer connecting part; 342, surround part; 343, inner connecting part; 35, centering support; 351, first fixing part; 352, second fixing part; 353, cantilever part; 41, first sealing layer; 42, second sealing layer; 51, first rear cavity; 52, first front cavity; 53, second rear cavity; 54, second front cavity; 200. Sound-generating module; 201. Module shell; 202. Main body; 203. Sound output part; 2031. Sound outlet.
[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 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.
[0022] 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.
[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. 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.
[0024] 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.
[0025] 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.
[0026] 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.
[0027] 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 size of the product.
[0028] Please see Figure 1 , Figure 3 and Figure 7In 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 magnetic circuit system 2 is connected to the housing 1 and forms two magnetic gaps. The vibration system 3 includes a voice coil 33 and a first diaphragm 31, an isolation diaphragm 34, and a second diaphragm 32, which are sequentially spaced along a first direction on the housing 1. The voice coil 33 and the magnetic circuit system 2 are located on the side of the second diaphragm 32 away from the first diaphragm 31. There are two voice coils 33, each corresponding to one of the two diaphragms. A magnetic gap is provided, and two voice coils 33 are connected to the second diaphragm 32; 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, the first dome 312 covers the first through hole 3111, the first dome 312 includes a first connecting portion 3121 and a first extension portion 3122 connected to each other, the first connecting portion 3121 is connected to the edge of the first through hole 3111, and the first extension portion 3122 extends toward the second diaphragm 32; the second The diaphragm 32 includes a second folded ring 321 and a second dome 322. The second folded ring 321 has a second through hole 3211, and the second dome 322 covers the second through hole 3211. The second dome 322 includes a second connecting portion 3221 and a second extension portion 3222 connected to each other. The second connecting portion 3221 is connected to the edge of the second through hole 3211, and the second extension portion 3222 extends toward the first diaphragm 31. One end of the second extension portion 3222 away from the second connecting portion 3221 is connected to the first extension portion 3222. One end of the extension 3122 away from the first connecting part 3121 is connected to both sides of the isolation diaphragm 34 along the first direction; wherein, a first rear cavity 51 is formed between the isolation diaphragm 34 and the first diaphragm 31, a second rear cavity 53 is formed between the second diaphragm 32 and the magnetic circuit system 2, and a first front cavity 52 is formed between the isolation diaphragm 34 and the second diaphragm 32. The housing 1 is provided with a first front cavity sound hole 1112 communicating with the first front cavity 52 and a first rear cavity sound hole 1111 communicating with the first rear cavity 51.
[0029] The sound-emitting unit 100 of the present invention can be a miniature loudspeaker unit. The sound-emitting unit 100 can be applied in the sound-emitting module 200 of an electronic device, such as a computer, mobile phone, smart wearable device, laptop computer, virtual reality device, augmented reality device, mixed reality device, or extended reality device. This embodiment uses a loudspeaker unit as an example for illustration.
[0030] The technical solution of the present invention involves placing two voice coils 33 and a magnetic circuit system 2 on the side of the second diaphragm 32 away from the first diaphragm 31. The two voice coils 33 are respectively positioned corresponding to the two magnetic gaps of the magnetic circuit system 2. The second extension 3222 of the second dome 322 of the second diaphragm 32 is connected to one side of the isolation diaphragm 34, and the first extension 3122 of the first dome 312 of the first diaphragm 31 is connected to the other side of the isolation diaphragm 34. This allows the two voice coils 33 connected to the second diaphragm 32 to drive the first diaphragm 31 and the second diaphragm 32 to vibrate and produce sound in the same direction. The use of dual voice coils 33 moving along the first direction for driving is more efficient than single voice coil driving in terms of the magnetic energy product of the flat magnetic circuit (magnetic energy product is one of the most important performance parameters of permanent magnet materials, representing 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-producing unit 100.
[0031] 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.
[0032] In addition, a first rear cavity 51 is formed between the isolation diaphragm 34 and the first diaphragm 31, a second rear cavity 53 is formed between the second diaphragm 32 and the magnetic circuit system 2, and a first front cavity 52 is formed between the isolation diaphragm 34 and the second diaphragm 32. The housing 1 is provided with a first front cavity sound hole 1112 communicating with the first front cavity 52 and a first rear cavity sound hole 1111 communicating with the first rear cavity 51, 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.
[0033] 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 52 compared to a traditional loudspeaker. At the same time, the first diaphragm 31 and the module housing 201 form a second front cavity 54. In this embodiment, the sound waves from the first diaphragm 31 and the second diaphragm 32 are radiated outward through the first front cavity 52 and the second front cavity 54 respectively and then combined to produce sound. This increases the effective vibration area of the vibration system 3 without increasing the product size.
[0034] Furthermore, this application positions the second diaphragm 32 above the magnetic circuit system. Compared to earlier applications where the second diaphragm 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.
[0035] It should be noted that the number of voice coils 33 can be two or more, and there is no limitation 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. Specifically, both voice coils 33 are connected to the side of the second connecting part 3221 facing the magnetic circuit system 2. The first extension part 3122 and the second extension part 3222 are respectively bonded to both sides of the isolation diaphragm 34. The first connecting part 3122 and the second extension 3222 can also be connected to both sides of the isolation diaphragm 34 respectively through connecting structural members. The connecting structural members are such as connecting columns or connecting blocks, and the shape of the connecting structural members is not limited here. The connecting structural members can be connected to the extension and the isolation diaphragm 34 by adhesive bonding. The number of first folded rings 311 can be at least one. If the number of first folded rings 311 is two or more, the bending direction of adjacent first folded rings 311 is opposite. The number of second folded rings 321 can be at least one. If the number of second folded rings 321 is two or more, the bending direction of adjacent second folded rings 321 is opposite. The first connecting part 3121 and the first extension 3122 are integrally formed, and the second connecting part 3221 and the second extension 3222 are integrally formed, reducing the number of components and reducing energy transfer loss.
[0036] Please see Figures 6 to 8In one embodiment, the isolation diaphragm 34 includes an outer connecting portion 341, a folded loop portion 342, and an inner connecting portion 343 arranged sequentially around the diaphragm. The outer edge of the outer connecting portion 341 is connected to the housing 1. The side of the first extension portion 3122 away from the first connecting portion 3121 and the side of the second extension portion 3222 away from the second connecting portion 3221 are connected to both sides of the inner connecting portion 343 along a first direction. In this embodiment, the isolation diaphragm 34 is formed by the outer connecting portion 341, the folded loop portion 342, and the inner connecting portion 343 arranged sequentially from the outside to the inside, thereby ensuring that the voice coil 33 can drive the first diaphragm 31 and the second diaphragm 32 to vibrate synchronously through the second diaphragm 32 and the isolation diaphragm 34. The presence of the folded loop portion 342 allows the inner connecting portion 343 to vibrate synchronously along the vibration direction of the voice coil 33, reducing the influence of the isolation diaphragm 34 on the vibration of the first diaphragm 31 and the second diaphragm 32.
[0037] Please see Figure 3 , Figure 5 and Figure 6 In one embodiment, the housing 1 includes a housing body 11 and a partition plate 12 disposed within the housing body 11. The magnetic circuit system 2, the first diaphragm 31, and the second diaphragm 32 are all connected to the housing body 11. The housing body 11 is provided with a first rear cavity acoustic hole 1111 and a first front cavity acoustic hole 1112. The partition plate 12 forms a third through hole 1221. The isolation diaphragm 34 is connected to the partition plate 12 and covers the third through hole 1221. The housing body 11, the partition plate 12, the first diaphragm 31, and the isolation diaphragm 34 form a first rear cavity 51. The housing body 11, the partition plate 12, the second diaphragm 32, and the isolation diaphragm 34 form a first front cavity 52. The housing body 11, the second diaphragm 32, and the magnetic circuit system 2 form a second rear cavity 53. The housing 1 includes a housing body 11 and a partition plate 12 disposed inside the housing body 11. The partition plate 12 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 partition plate 12 has a third through hole 1221, which is covered by the isolation diaphragm 34. This allows the first extension part 3122 and the second extension part 3222 connected to the isolation diaphragm 34 to pass through the third through hole 1221, thus ensuring that the second diaphragm 32 can drive the first diaphragm 31 to vibrate together through the isolation diaphragm 34.
[0038] It should be noted that the partition plate 12 and the shell body 11 can be integrally formed, or the partition plate 12 can be welded to the shell body 11, or the partition plate 12 can be glued to the shell body 11; there are no restrictions here. By setting the partition plate 12 to fix the isolation diaphragm 34, the partition plate 12 and the shell body 11 respectively support the first diaphragm 31 and the isolation diaphragm 34, which can free up the height design of the shell body 11, and at the same time make the installation of the two diaphragms easier.
[0039] Please see Figure 4 , Figure 6 and Figure 7 In one embodiment, the shell body 11 includes a first outer shell 111 and a second outer shell 112 connected to each other. A partition plate 12 and the second outer shell 112 are disposed inside the first outer shell 111. One end of the first outer shell 111 is connected to the outer edge of the first diaphragm 31, and the other end of the first outer shell 111 is connected to the magnetic circuit system 2. A clearance hole for the voice coil 33 is provided at the end of the first outer shell 111 away from the first diaphragm 31. The magnetic circuit system 2 is approximately flush with the outer surface of the first outer shell 111. The partition plate 12 is located between the first diaphragm 31 and the second outer shell 112. The outer edge of the second diaphragm 32 is connected to the second outer shell 112. The first outer shell 111 is provided with a first front cavity sound hole 1112 and a first rear cavity sound hole 1111. The shell body 11 includes a first outer shell 111 and a second outer shell 112 disposed within the first outer shell 111. One end of the first outer shell 111 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 111 is connected to the magnetic circuit system 2 for obtaining stable support. The outer surface of the magnetic circuit system 2 can be flush with the outer surface of the first outer shell 111, which means approximately flush. This includes the outer surface of the first outer shell 111 being slightly protruding outward compared to the outer surface of the magnetic circuit system 2, or the outer surface of the magnetic circuit system 2 being slightly protruding outward compared to the outer surface of the first outer shell 111. 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.
[0040] It should be noted that the first outer shell 111 and the second outer shell 112 can be welded or bonded, and there is no limitation here. The bottom wall inside the first outer shell 111 is connected to the end of the second outer shell 112 away from the first diaphragm 31, thereby providing reliable support for the second outer shell 112.
[0041] According to one embodiment of the present invention, the outer edge of the second diaphragm 32 is sandwiched between the inner sidewall and the outer sidewall of the second housing 112, thereby enabling a more secure fixation of the outer edge of the second diaphragm 32.
[0042] Please see Figure 11In one embodiment, the shell body 11 has a first side end and a second side end 114 disposed opposite to each other along a first direction, at least the first side end is open, the first diaphragm 31 is covered on the first side end, and the magnetic circuit system 2 is connected to the second side end 114; the shell body 11 is stepped, so as to form a first stepped surface 113 facing the first side end in the inner cavity of the shell body 11, the second diaphragm 32 is disposed in the shell body 11, and the edge of the second diaphragm 32 is attached to the first stepped surface 113, and the partition plate 12 is located between the first diaphragm 31 and the first stepped surface 113. The shell body 11 is recessed inward near the second side end 114 to form a step, thereby forming a first step surface 113 in the inner cavity of the shell body 11. The outer edge of the second diaphragm 32 is attached to the first step surface 113 to fix the outer edge of the second diaphragm 32. This arrangement not only enables the shell body 11 to fix the first diaphragm 31 and the second diaphragm 32, but also makes it easier to produce and assemble than split structural components, since the shell body 11 is a single structural component.
[0043] Please see Figure 3 , Figure 7 and Figure 12 In one embodiment, the partition plate 12 includes a plate body 121 and a protrusion 122 disposed at the center of the plate body 121. A third through hole 1221 penetrates the protrusion 122. The isolation diaphragm 34 is connected to the protrusion 122. The outer edge of the plate body 121 is connected to the inner wall of the shell body 11. The plate body 121, the protrusion 122, and the shell body 11 form a receiving groove 1222 for receiving the first sealant layer 41. The partition plate 12 is sealed to the shell body 11 through the first sealant layer 41. The partition plate 12 includes a plate body 121 and a protrusion 122 located at the center of the plate body 121. The protrusion 122 protrudes from the plate body 121 on the side facing the first diaphragm 31. The outer edge of the plate body 121 is connected to the inner wall of the first outer shell 111. The side of the plate body 121 facing the first diaphragm 31 serves as the bottom wall of the receiving groove 1222. The outer side wall of the protrusion 122 and the inner side wall of the first outer shell 111 form two groove side walls of the receiving groove 1222 that are spaced apart from each other. Thus, the first outer shell 111, the protrusion 122 and the shell body 11 surround the receiving groove 1222. The formation of the receiving groove 1222 can better accommodate the first sealing layer 41 and prevent the first sealing layer 41 from flowing to other positions before it solidifies, thereby affecting the final sealing effect. This provides a guarantee that the first rear cavity 51 and the first front cavity 52 are not interconnected.
[0044] Please see Figure 3 , Figure 7 and Figure 12In one embodiment, the outer edge of the second diaphragm 32 is sealed to the shell body 11 through the second sealant layer 42; wherein the second sealant layer 42 connects the outer edge of the second diaphragm 32 to the inner wall of the first shell 111, thereby preventing the first front cavity 52 and the second rear cavity 53 from communicating with each other.
[0045] In one embodiment, the frequency corresponding to the vibration mode of the partition plate 12 is greater than the upper limit of the human hearing range; wherein the human hearing range is 20Hz to 20000Hz, and the frequency corresponding to the vibration mode of the partition plate 12 (vibration mode describes the inherent characteristics of a structure or system during vibration, including natural frequency, damping ratio, and mode shape, and is the core content of modal analysis) is greater than 20000Hz, thereby reducing the probability of the partition plate 12 undergoing natural vibration. It should be noted that the partition plate 12 can be a metal plate or a high-stiffness plastic plate, and there is no limitation herein.
[0046] Please see Figure 9 and Figure 10 In one embodiment, the inner wall of the shell body 11 is provided with a plurality of supporting steps 1113. The side of the plurality of supporting steps 1113 facing the first diaphragm 31 abuts against the side of the partition plate 12 away from the first diaphragm 31 to support the partition plate 12. By providing a plurality of supporting steps 1113 circumferentially spaced on the inner wall of the first shell 111, reliable and stable support is provided for the partition plate 12 to ensure that the position of the receiving groove 1222 does not change, thereby ensuring that the position of the first sealant layer 41 is fixed so as to fix the partition plate 12 in the designated position; wherein the four corners of the first shell 111 protrude inward to form supporting steps 1113, which on the one hand can provide reliable support for the partition plate 12, and on the other hand can also improve the structural strength of the first shell 111.
[0047] Please see Figure 14 and Figure 15In one embodiment, the first extension 3122 and the first connecting portion 3121 form a first opening groove 3123. The opening of the first opening groove 3123 faces the side away from the second diaphragm 32. The first opening groove 3123 communicates with the first through hole 3111. The ratio of the width of the opening of the first opening groove 3123 along the second direction to the width of the first dome 312 along the second direction is greater than or equal to 1:3. The ratio of the width of the opening of the first opening groove 3123 along the third direction to the width of the first dome 312 along the third direction is greater than or equal to 1:3. The first direction, the second direction, and the third direction are perpendicular to each other. In this embodiment, the first extension 3122 is the first dome. The first extension 3122, formed by bending and stretching, enhances the rigidity of the entire first dome 312. In this embodiment, the ratio of the width (D3) of the opening 3123 in the second direction to the width (D4) of the first dome 312 in the second direction is controlled to be greater than or equal to 1:3. Similarly, the ratio of the width (D1) of the opening 3123 along the third direction to the width (D2) of the first dome 312 along the third direction is controlled to be greater than or equal to 1:3. This effectively prevents resonance of the first dome 312 in the mid-to-low frequency range. Furthermore, as the ratio increases, the first dome 312 becomes less prone to resonance in the mid-to-low frequency range. The second direction is... Figure 15 The left and right directions, and the third direction is Figure 14 The front and back directions.
[0048] Please see Figure 14 and Figure 15 In one embodiment, the second extension 3222 and the second connecting portion 3221 form a second opening groove 3223. The opening of the second opening groove 3223 faces the side away from the first diaphragm 31. The second opening groove 3223 communicates with the first through hole 3111. The ratio of the width of the opening of the second opening groove 3223 along the second direction to the width of the second dome 322 along the second direction is greater than or equal to 1:3. The ratio of the width of the opening of the second opening groove 3223 along the third direction to the width of the second dome 322 along the third direction is greater than or equal to 1:3. The first direction, the second direction, and the third direction are perpendicular to each other. In this embodiment, the second extension 3222 is the second dome. The second extension 3222 is formed by bending and stretching, and the presence of the second extension 3222 enhances the rigidity of the entire second dome 322. In this embodiment, the ratio of the width (L3) of the opening of the second slot 3223 in the second direction to the width (L4) of the second dome 322 in the second direction is controlled to be greater than or equal to 1:3, and the ratio of the width (L1) of the opening of the second slot 3223 along the third direction to the width (L2) of the second dome 322 along the third direction is controlled to be greater than or equal to 1:3. This effectively avoids resonance of the second dome 322 in the mid-to-low frequency range. As the ratio increases, the second dome 322 is less likely to resonate in the mid-to-low frequency range.
[0049] Please see Figure 3 , Figure 6 and Figure 7 In one embodiment, a first connecting plane 3124 is formed at the end of the first extension 3122 facing the second extension 3222, and a second connecting plane 3224 is formed at the end of the second extension 3222 facing the first extension 3122. The first connecting plane 3124 and the second connecting plane 3224 are respectively connected to both sides of the isolation diaphragm 34 along the first direction. By forming the first connecting plane 3124 and the second connecting plane 3224, the contact area between the first extension 3122 and the second extension 3222 and the isolation diaphragm 34 is increased in the form of surface contact, thereby improving the connection strength between the first extension 3122 and the isolation diaphragm 34, and also improving the connection strength between the second extension 3222 and the isolation diaphragm 34. It should be noted that the first connecting plane 3124 and the second connecting plane 3224 are respectively bonded to both sides of the isolation diaphragm 34 along the first direction.
[0050] Please see Figure 3 , Figure 6 and Figure 7 In one embodiment, the cross-sectional dimension of the first extension 3122 in the first direction gradually expands from the end near the second diaphragm 32 to the end away from the second diaphragm 32; wherein the first extension 3122 is tapered, which helps to enhance the horizontal stiffness of the first dome 312, and this arrangement facilitates the shaping of the first dome 312 and can better avoid the isolation diaphragm 34.
[0051] Please see Figure 3 , Figure 6 and Figure 7 In one embodiment, the cross-sectional dimension of the second extension 3222 in the direction perpendicular to the first direction is gradually widened from the end near the first diaphragm 31 to the end away from the first diaphragm 31; wherein the second extension 3222 is tapered, which helps to enhance the horizontal stiffness of the second dome 322, and this arrangement facilitates the shaping of the second dome 322 and can better avoid the isolation diaphragm 34.
[0052] Please see Figure 9 , Figure 10 and Figure 12 In one embodiment, along the circumference of the housing 1, a plurality of first front cavity acoustic holes 1112 are provided on one side of the housing 1, and a plurality of first rear cavity acoustic holes 1111 are provided on the remaining side of the housing 1; wherein, the first front cavity acoustic holes 1112 and the first rear cavity acoustic holes 1111 are not coplanarly arranged to avoid mutual interference of the anti-phase sound waves radiated by the first front cavity acoustic holes 1112 and the first rear cavity acoustic holes 1111.
[0053] In one embodiment, the sound-generating unit 100 further comprises a second rear cavity sound hole communicating with the second rear cavity 53. The second rear cavity sound hole may be disposed in the magnetic circuit system 2, 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; no specific limitation is made here.
[0054] Figure 4 , Figure 7 and Figure 12 In one embodiment, two voice coils 33 are arranged side-by-side along a second direction, which is perpendicular to the first direction. 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 the 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, and two magnetic gaps are respectively arranged around the two central magnets 221. Compared with the case where the two voice coils 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 12 The vertical direction is shown, and the second direction is... Figure 12 The left and right directions are shown.
[0055] Please see Figure 9 and Figure 10 In one embodiment, the first side magnet 231 includes a central portion 2311 and end portions 2312 disposed at both ends of the central portion 2311. 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.
[0056] Please see Figure 7, Figure 9 and Figure 10 In one embodiment, the magnetic yoke 21 further 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 housing 1 is provided with a positioning hole 1114 for inserting the positioning plate 213, and the positioning plate 213 is tightly fitted with the wall of the positioning hole 1114. In this embodiment, by setting the positioning plate 213 to be inserted into the positioning hole 1114 and tightly fitted with the wall of the positioning hole 1114, the magnetic yoke 21 and the first housing 111 are positioned and connected, thereby ensuring that the magnetic circuit system 2 and the voice coil 33 have suitable concentricity. The positioning hole 1114 can also be used as a second rear cavity sound hole, that is, in addition to being used for inserting the positioning plate 213, the positioning hole 1114 can also be used as a second rear cavity sound hole, thereby enriching the function of the positioning hole 1114 and simplifying the structural design of the sound generating device.
[0057] Please see Figure 2 According 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.
[0058] Please see Figure 10 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.
[0059] Please see Figure 10 In one embodiment, the shape of the yoke body 211 is adapted to the shapes of the side magnet assembly 23 and the center magnet assembly 22. This adaptation prevents the outer contour of the yoke body 211 from protruding beyond the side magnet assembly 23, thus avoiding an increase in the overall size of the sound-generating unit 100; it also 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.
[0060] Please see Figure 7 , Figure 10 and Figure 12 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.
[0061] The shell 1 is a metal shell, and the first side magnetic plate 241 and the second side magnetic plate 242 are integrally formed with the shell 1. The shell 1 can be a metal shell 1, and the first side magnetic plate 241, the second side magnetic plate 242 and the first outer shell 111 are integrally formed with the shell 1. It 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.
[0062] Please see Figure 10 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 111, 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.
[0063] Please see Figure 4According 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.
[0064] 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.
[0065] Please see Figure 12 and Figure 13 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 54 between the main body 202 and the first diaphragm 31. The sound-emitting part 203 communicates with the second front cavity 54 and the first front cavity sound hole 1112. 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.
[0066] After the module housing 1 is assembled with the sound-emitting unit 100, it can be installed as a whole component into the housing 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, which serves as a semi-module structure. On the one hand, it reduces the overall height of the sound-emitting module 200. On the other hand, the first rear cavity 51 and the second rear cavity 53 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 section 203 is provided with a sound outlet hole 2031, which is oriented towards the first front cavity sound hole 1112 and the second front cavity 54, so that the first front cavity 52 and the second front cavity 54 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.
[0067] 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: case; A magnetic circuit system, which is connected to the housing, forms two magnetic gaps; A vibration system, comprising a voice coil and a first diaphragm, an isolation diaphragm, and a second diaphragm sequentially spaced apart along a first direction in the housing; the voice coil and the magnetic circuit system are located on the side of the second diaphragm away from the first diaphragm; the voice coil comprises two voice coils, each corresponding to one of the two magnetic gaps, and the two voice coils are connected to the second diaphragm; The first diaphragm includes a first folded ring and a first dome. The first folded ring has a first through hole, and the first dome covers the first through hole. The first dome includes an integrally formed first connecting portion and a first extension portion. The first connecting portion is connected to the edge of the first through hole, and the first extension portion extends toward the second diaphragm. The second diaphragm includes a second folded ring and a second dome. The second folded ring has a second through-hole, and the second dome covers the second through-hole. The second dome includes an integrally formed second connecting portion and a second extension portion. The second connecting portion is connected to the edge of the second through-hole, and the second extension portion extends toward the first diaphragm. One end of the second extension portion away from the second connecting portion and the other end of the first extension portion away from the first connecting portion are respectively connected to both sides of the isolation diaphragm along the first direction. 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 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 isolation diaphragm includes an outer connecting portion, a folded ring portion, and an inner connecting portion arranged in sequence. The outer edge of the outer connecting portion is connected to the housing. The side of the first extension portion away from the first connecting portion and the side of the second extension portion away from the second connecting portion are connected to the two sides of the inner connecting portion along the first direction.
3. The sound-generating unit as described in claim 1, characterized in that, The housing includes a housing body and a partition plate disposed within the housing body. The magnetic circuit system, the first diaphragm, and the second diaphragm are all connected to the housing body. The housing body is provided with a first rear cavity acoustic hole and a first front cavity acoustic hole. The partition plate forms a third through hole. The isolation diaphragm is connected to the partition plate and covers the third through hole. The housing body, the partition plate, the first diaphragm, and the isolation diaphragm form the first rear cavity. The housing body, the partition plate, the second diaphragm, and the isolation diaphragm form the first front cavity. The housing body, the second diaphragm, and the magnetic circuit system form the second rear cavity.
4. The sound-generating unit as described in claim 3, characterized in that, The shell body includes a first outer shell and a second outer shell connected to each other. The partition plate and the second outer shell are disposed inside the first outer shell. One end of the first outer shell is connected to the outer edge of the first diaphragm, and the other end of the first outer shell is connected to the magnetic circuit system. The end of the first outer shell away from the first diaphragm has a clearance hole to avoid the voice coil. The magnetic circuit system is approximately flush with the outer surface of the first outer shell. The partition plate is located between the first diaphragm and the second outer shell. The outer edge of the second diaphragm is connected to the second outer shell. The first outer shell has a first front cavity acoustic hole and a first rear cavity acoustic hole.
5. The sound-generating unit as described in claim 3, characterized in that, The shell body has a first side end and a second side end disposed opposite to each other along the first direction, at least the first side end is open, the first diaphragm is disposed on the first side end, and the magnetic circuit system is connected to the second side end; the shell body is stepped to form a first stepped surface facing the first side end in the inner cavity of the shell body, the second diaphragm is disposed in the shell body, and the edge of the second diaphragm is attached to the first stepped surface, and the partition plate is located between the first diaphragm and the first stepped surface.
6. The sound-generating unit as described in claim 3, characterized in that, The partition plate includes a plate body and a protrusion disposed in the center of the plate body. The third through hole penetrates the protrusion. The isolation diaphragm is connected to the protrusion. The outer edge of the plate body is connected to the inner wall of the shell body. The plate body, the protrusion, and the shell body form a receiving groove for receiving the first sealing adhesive layer. The partition plate is sealed to the shell body through the first sealing adhesive layer. And / or, the outer edge of the second diaphragm is sealed to the shell body through a second sealant layer; And / or, the frequency corresponding to the vibration mode of the partition plate is greater than the upper limit of the human hearing range; And / or, the inner wall of the shell body is provided with a plurality of supporting steps, and the side of the plurality of supporting steps facing the first diaphragm abuts against the side of the partition plate away from the first diaphragm to support the partition plate.
7. The sound-generating unit as described in any one of claims 1 to 6, characterized in that, The first extension and the first connecting portion form a first opening groove. The opening of the first opening groove faces away from the second diaphragm. The first opening groove communicates with the first through hole. The ratio of the width of the opening of the first opening groove along the second direction to the width of the first dome along the second direction is greater than or equal to 1:
3. The ratio of the width of the opening of the first opening groove along the third direction to the width of the first dome along the third direction is greater than or equal to 1:
3. The first direction, the second direction, and the third direction are perpendicular to each other. And / or, the second extension and the second connecting portion form a second opening groove, the opening of the second opening groove faces away from the first diaphragm, the second opening groove communicates with the first through hole, the ratio of the width of the opening of the second opening groove along the second direction to the width of the second dome along the second direction is greater than or equal to 1:3; the ratio of the width of the opening of the second opening groove along the third direction to the width of the second dome along the third direction is greater than or equal to 1:3; the first direction, the second direction and the third direction are perpendicular to each other; And / or, the first extension portion forms a first connecting plane at one end facing the second extension portion, and the second extension portion forms a second connecting plane at one end facing the first extension portion, and the first connecting plane and the second connecting plane are respectively connected to both sides of the isolation diaphragm along the first direction; And / or, the cross-sectional dimensions of the first extension in the direction perpendicular to the first direction are gradually widened from the end closer to the second diaphragm to the end farther away from the second diaphragm; And / or, the cross-sectional dimensions of the second extension in the direction perpendicular to the first direction are gradually widened from the end closer to the first diaphragm to the end farther away from the first diaphragm; And / or, along the circumferential direction of the housing, a plurality of first front cavity acoustic holes are provided on one side of the housing, and a plurality of first rear cavity acoustic holes are provided on the remaining side of the housing; And / or, the sound-generating unit is further provided with a second rear cavity sound hole that communicates with the second rear cavity.
8. The sound-generating unit as described in any one of claims 1 to 6, characterized in that, The two voice coils are arranged side by side along a second direction, which is perpendicular to the first direction. 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 the 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 arranged around the two central magnets.
9. The sound-generating unit as described in claim 8, characterized in that, The first side magnet includes a central portion and end portions disposed at both ends of the central portion. 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 further 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, the 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.
10. The sound-generating unit as described in claim 8, characterized in that, The magnetic circuit system further includes a magnetic guide plate assembly, which comprises 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 housing is a metal housing, and the first side magnetic plate and the second side magnetic plate are integrally formed with the housing; and / or, the shape of the first side magnetic plate is adapted to the shape of the first side magnet.
11. 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 10. 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.