Sound production unit

Abstract

The utility model discloses a sounding unit, which comprises a magnetic circuit assembly, a diaphragm assembly, a framework and a plurality of voice coils, the magnetic circuit assembly comprises an upper yoke, a lower yoke, and a central magnetic structure and an edge magnetic structure which are respectively arranged on the lower yoke, and the upper yoke covers the central magnetic structure and the edge magnetic structure. The magnetic circuit assembly is provided with a plurality of magnetic gaps, the magnetic gaps correspond to the central magnetic structures in a one-to-one mode, the magnetic gaps surround the central magnetic structures, the magnetic gaps are located between the upper yoke and the lower yoke, and the magnetic gaps correspond to the central magnetic structures in a one-to-one mode. The magnetic circuit assembly is provided with a first magnetic loop and a second magnetic loop which are opposite in direction, the first magnetic loop penetrates through the upper portion of the magnetic gap, and the second magnetic loop penetrates through the lower portion of the magnetic gap. The framework comprises an inner mounting part, a connecting part and an outer mounting part which are connected in sequence, the inner mounting part is connected with the voice coil, and the outer mounting part is connected with the transition part. The sounding unit is light and thin in structure and high in performance.

Description

Technical Field

[0001] This utility model relates to the field of electroacoustic converter technology, and in particular to a sound generating unit. Background Technology

[0002] As electronic devices such as mobile phones and tablets become smaller and thinner, the space reserved for the installation of sound units is getting thinner and thinner. However, at the same time, the sensitivity requirements of electronic devices for sound units are getting higher and higher. Therefore, how to improve the sensitivity of sound units under the constraints of product structure and size has become the key.

[0003] Existing sound units typically employ a single-sided magnetic circuit assembly scheme, meaning the voice coil has a magnetic circuit assembly at its bottom. However, when the voice coil vibrates upwards during operation, it moves away from the magnetic gap of the magnetic circuit assembly, resulting in poor symmetry and flatness of the black-and-white (BL). Furthermore, since only the bottom of the voice coil is within the magnetic gap, this significantly limits the performance improvement of the sound unit. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a high-performance thin sound unit.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a sound-generating unit, comprising:

[0006] A magnetic circuit assembly includes an upper yoke, a lower yoke, and a central magnetic structure and a side magnetic structure respectively disposed on the lower yoke. The upper yoke covers the central magnetic structure and the side magnetic structure. The central magnetic structure is located between at least one set of two oppositely disposed side magnetic structures. The number of central magnetic structures is multiple. The magnetic circuit assembly has multiple magnetic gaps, each corresponding to a central magnetic structure. The magnetic gaps surround the central magnetic structure and are located between the upper yoke and the lower yoke. The magnetic circuit assembly has a first magnetic loop and a second magnetic loop with opposite directions. The first magnetic loop passes through the upper part of the magnetic gap, and the second magnetic loop passes through the lower part of the magnetic gap.

[0007] Multiple voice coils, each voice coil being located within a magnetic gap and corresponding to a magnetic gap;

[0008] A diaphragm assembly, comprising an inner fixing part, an inner folded ring part, a transition part, an outer folded ring part, and an outer fixing part connected sequentially from the inside to the outside, wherein the inner fixing part is connected to the magnetic circuit assembly;

[0009] The frame includes an inner mounting part, a connecting part, and an outer mounting part connected in sequence. The inner mounting part is connected to the voice coil, and the outer mounting part is connected to the transition part.

[0010] In one embodiment, the central magnetic structure includes a lower central magnet, a central washer, and an upper central magnet connected sequentially from bottom to top; the side magnetic structure includes a lower side magnet, a side washer, and an upper side magnet connected sequentially from bottom to top.

[0011] In one embodiment, the inner folded ring portion and the outer folded ring portion have the same or different protrusion directions.

[0012] In one embodiment, the number of voice coils is two, and the inner mounting portion simultaneously connects the two voice coils in areas where they are close to each other.

[0013] In one embodiment, the two voice coils are connected to each other on their sides that are close to each other, or there is a gap between the two voice coils.

[0014] In one embodiment, a centering support is further included. The centering support includes an outer support, a cantilever, and an inner support connected in sequence. The outer support is connected to at least two sets of cantilever sections. Each set of cantilever sections includes at least one deformation arm. The inner mounting portion is located between the two sets of cantilever sections. The inner support portion connected to one set of cantilever sections is connected to one voice coil, and the inner support portion connected to the other set of cantilever sections is connected to another voice coil.

[0015] In one embodiment, the side magnetic structure is provided corresponding to the long side of the central magnetic structure, and the connecting portion is located outside the end of the central magnetic structure.

[0016] In one embodiment, the outer side of the top of the edge magnetic structure has a clearance groove for avoiding the inner folded ring portion.

[0017] In one embodiment, the upper yoke has an upper clearance groove corresponding to the magnetic gap, the upper clearance groove communicating with the magnetic gap; and / or, the lower yoke has a lower clearance groove corresponding to the magnetic gap, the lower clearance groove communicating with the magnetic gap.

[0018] In one embodiment, an intermediate magnetic structure is further included, the bottom of which is connected to the lower yoke and the top of which is connected to the upper yoke. The intermediate magnetic structure is located between two adjacent central magnetic structures, and a portion of the magnetic gap is formed between the intermediate magnetic structure and the adjacent central magnetic structure.

[0019] The beneficial effects of this invention are as follows: The novel structure of this sound-generating unit ensures that during vibration, both the upper and lower parts of the voice coil move within the magnetic gap without exceeding it. This improves the symmetry, flatness, and sensitivity of the black-and-white (BL) value, thereby enhancing the acoustic performance of the sound-generating unit. Furthermore, the large overall volume of the magnetic circuit components and the long effective length of the voice coil within the magnetic gap significantly increase the BL value, further improving the unit's performance. Additionally, the staggered transition between the voice coil and the diaphragm assembly prevents the diaphragm assembly from occupying the space above the voice coil, allowing the voice coil to vibrate with greater amplitude while maintaining a slim profile, thus increasing the loudness of the sound-generating unit. Moreover, the multi-voice-coil architecture effectively improves the magnetic utilization rate of the central magnetic structure, further enhancing the unit's performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is an exploded view of the sound-generating unit according to Embodiment 1 of this utility model;

[0022] Figure 2 A cross-sectional view of the sound-generating unit of Embodiment 1 of this utility model. Figure 1 ;

[0023] Figure 3 A cross-sectional view of the sound-generating unit of Embodiment 1 of this utility model. Figure 2 ;

[0024] Figure 4 This is a schematic diagram of the magnetic circuit of the sound-generating unit in Embodiment 1 of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the sound-generating unit after the lower yoke is hidden in Embodiment 1 of this utility model.

[0026] Figure 6 This is a schematic diagram of the structure of the sound-generating unit after the lower yoke and diaphragm assembly are hidden in Embodiment 1 of this utility model.

[0027] Explanation of icon numbers:

[0028] 1. Pot stand;

[0029] 2. Magnetic circuit assembly; 21. Upper yoke; 211. Lower protrusion; 212. Upper clearance slot; 22. Lower yoke; 23. Central magnetic structure; 231. Lower central magnet; 232. Central washer; 233. Upper central magnet; 24. Side magnetic structure; 241. Lower side magnet; 242. Side washer; 243. Upper side magnet; 244. Clearance slot;

[0030] 3. Diaphragm assembly; 31. Inner fixing part; 32. Inner folding ring part; 33. Transition part; 34. Outer folding ring part; 35. Outer fixing part; 36. Annular dome;

[0031] 4. Frame; 41. Inner mounting part; 42. Connecting part; 43. Outer mounting part; 431. Hollow protrusion; 432. Outer flange; 433. Inner flange; 434. Avoidance notch;

[0032] 5. Voice coil;

[0033] 6. Centering support; 61. External support; 62. Cantilever; 63. Internal support. Detailed Implementation

[0034] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be noted that if the embodiments of this utility model 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 as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such 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.

[0038] Furthermore, if the meaning of "and / or" appears throughout the text, it refers to three parallel solutions. For example, "and / or" includes solution 1, solution 2, and solution 3, which simultaneously satisfy the above conditions. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. 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 utility model.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] Example 1

[0041] Please refer to Figures 1 to 6 The first embodiment of this utility model is as follows: a sound-generating unit, including a frame 1, a magnetic circuit assembly 2, a diaphragm assembly 3, a frame 4, and multiple voice coils 5. The magnetic circuit assembly 2 is fixedly connected to the frame 1. The magnetic circuit assembly 2 includes an upper yoke 21, a lower yoke 22, and a central magnetic structure 23 and a side magnetic structure 24 respectively disposed on the lower yoke 22. The upper yoke 21 covers the central magnetic structure 23 and the side magnetic structure 24. The central magnetic structure 23 is located between at least one set of two oppositely disposed side magnetic structures 24. There are multiple central magnetic structures 23. The magnetic circuit assembly 2 has multiple magnetic gaps. Each magnetic gap corresponds to one of the central magnetic structures 23. The magnetic gaps surround the central magnetic structure 23 and are located on the upper yoke 22. Between the yoke 21 and the lower yoke 22, the magnetic circuit assembly 2 has a first magnetic circuit and a second magnetic circuit with opposite directions. The first magnetic circuit passes through the upper part of the magnetic gap, and the second magnetic circuit passes through the lower part of the magnetic gap. The diaphragm assembly 3 includes an inner fixing part 31, an inner folded ring part 32, a transition part 33, an outer folded ring part 34, and an outer fixing part 35 connected sequentially from the inside to the outside. The inner fixing part 31 is connected to the magnetic circuit assembly 2, and the outer fixing part 35 is connected to the frame 1. The frame 4 includes an inner mounting part 41, a connecting part 42, and an outer mounting part 43 connected sequentially. The inner mounting part 41 is connected to the voice coil 5. The voice coil 5 is located in the magnetic gap and corresponds one-to-one with the magnetic gap. The outer mounting part 43 is connected to the transition part 33.

[0042] In some embodiments, the inner mounting portion 41 is set higher than or flush with the outer fixing portion 35. However, in this embodiment, since the inner mounting portion 41 is connected to the bottom surface of the voice coil 5, the inner fixing portion 31 is set lower than the outer fixing portion 35. Considering factors such as weight reduction, avoiding the diaphragm assembly 3, and improving structural strength, in this embodiment, the connecting portion 42 is stepped. In other embodiments, the connecting portion 42 may also be L-shaped or obtuse-angled, and can be set as needed.

[0043] In other embodiments, the inner fixing part 31 may be connected to the edge magnetic structure 24. In this embodiment, the inner fixing part 31 is connected to the upper yoke 21. Specifically, the edge of the upper yoke 21 has a lower protrusion 211, and the inner fixing part 31 is generally ring-shaped. The inner edge of the inner fixing part 31 is connected to the bottom surface of the lower protrusion 211. This can reduce the space occupied by the diaphragm assembly 3 on the thickness of the sound unit during vibration to a greater extent, which is conducive to ensuring the thinness of the sound unit.

[0044] The central magnetic structure 23 includes a lower central magnet 231, a central washer 232, and an upper central magnet 233 connected sequentially from bottom to top; the side magnetic structure 24 includes a lower side magnet 241, a side washer 242, and an upper side magnet 243 connected sequentially from bottom to top. Preferably, when the sound-generating unit is not working, the middle part of the voice coil 5 is aligned or approximately aligned with the central washer 232, that is, when the sound-generating unit is not working, the voice coil 5 is centered within the magnetic gap in the thickness direction of the sound-generating unit. It is easy to understand that the upper yoke 21, the upper side magnet 243, and the upper central magnet 233 near the upper side magnet 243 constitute a first magnetic circuit, and the lower yoke 22, the lower side magnet 241, and the lower central magnet 231 near the lower side magnet 241 constitute a second magnetic circuit. When two central magnetic structures 23 are adjacent, the magnetic poles of the two adjacent central magnetic structures 23 are oriented in opposite directions. The upper yoke 21 and the two upper central magnets 233 form another first magnetic circuit, and the lower yoke 22 and the two lower central magnets 231 form another second magnetic circuit.

[0045] The outer mounting part 43 is generally ring-shaped. To improve the structural strength of the outer mounting part 43, it is provided with reinforcing ribs. The reinforcing ribs include at least one of a hollow convex bulge, a solid boss, an inner flange connecting the inner edge of the outer fixing part, and an outer flange connecting the outer edge of the outer fixing part. The reinforcing ribs can improve the rigidity of the frame and, to a certain extent, mitigate the impact of the segmented vibration phenomenon during high-frequency vibration on the performance of the sound unit, thus improving the high-frequency performance of the sound unit. In particular, since this sound unit is a large-amplitude electroacoustic device, the segmented vibration phenomenon during high-frequency vibration is quite obvious, making the reinforcing ribs on the outer mounting part 43 particularly significant. In this embodiment, the outer fixing part 35 is provided with a ring-shaped hollow convex bulge 431, which protrudes towards the lower yoke 22. The outer edge of the outer fixing part 35 has a bent outer flange 432, and the inner edge of the outer fixing part 35 has a bent inner flange 433.

[0046] In some embodiments, the number of voice coils 5 can be three, four, or even more. In this embodiment, the number of voice coils 5 is two. The inner mounting portion 41 connects the two voice coils 5 simultaneously in areas where they are close to each other. This arrangement not only simplifies the structure of the frame 4 and facilitates its production and assembly with the voice coils 5, but also effectively improves the synchronicity of the two voice coils 5, thereby improving the acoustic performance of the sound-generating unit. In other embodiments, it is also acceptable for the frame 4 to have multiple inner mounting portions 41 on one side, with multiple inner mounting portions 41 connected one-to-one with each voice coil 5.

[0047] In some embodiments, a certain gap may be maintained between two adjacent voice coils 5. In a preferred embodiment, the sides of the two voice coils 5 that are close to each other are connected. Specifically, the outer walls of two adjacent voice coils 5 are bonded together. The bonding methods include, but are not limited to, bonding with glue, bonding with double-sided tape, or bonding with a self-adhesive layer on the surface of the wire wound around the voice coils 5. Connecting the two voice coils 5 together helps reduce the probability of the voice coil 5 separating from the inner mounting portion 41 that simultaneously connects the two voice coils 5, thus improving the structural stability of the sound-generating unit. Of course, a gap between the two voice coils 5 is also acceptable.

[0048] In this embodiment, the side magnetic structure 24 is arranged corresponding to the long side of the central magnetic structure 23, the connecting part 42 is located outside the end of the central magnetic structure 23, and the ratio of the long side length to the short side length of the voice coil 5 can be made relatively large, thereby improving the magnetic utilization rate of the central magnetic structure 23, greatly increasing the effective length of the voice coil 5 in the magnetic gap, giving the sound unit a larger BL value, and thus improving the performance of the sound unit.

[0049] To improve the polarization phenomenon of the voice coil 5, the sound-generating unit also includes a centering support 6. The centering support 6 includes an outer support portion 61, a cantilever portion 62, and an inner support portion 63 connected in sequence. In a preferred embodiment, the outer support portion 61 is connected to at least two sets of cantilever portions 62. Each set of cantilever portions 62 includes at least one deformation arm. The inner mounting portion 41 is located between the two sets of cantilever portions 62. One set of cantilever portions 62 is connected to an inner support portion 63 that is connected to one voice coil 5, and the other set of cantilever portions 62 is connected to an inner support portion 63 that is connected to another voice coil 5. The centering support 6 is an FPC board, and multiple voice coils 5 are connected in series or parallel through the centering support 6 and are connected to an external power source.

[0050] To prevent the inner flange 433 on the frame 4 from colliding with the cantilever 62 when the sound-generating unit is working, the inner flange 433 is provided with an avoidance notch 434, which is used to avoid the cantilever 62.

[0051] When the short side length of the voice coil 5 is relatively small, the advantage of the inner mounting part 41 of the frame 4 simultaneously connecting the two voice coils 5 in the areas where they are close to each other is particularly significant. This allows space to be provided for the voice coils 5 to connect with the inner mounting part 41. Specifically, the areas where the ends of the two voice coils 5 are close to each other are simultaneously fixedly connected to the inner fixing part 31, while the areas where the ends of the two voice coils 5 are far apart are respectively connected to different inner support parts 63. This undoubtedly makes full use of the limited space inside the sound-producing unit, making the overall structure of the sound-producing unit more compact.

[0052] The inner folded ring portion 32 and the outer folded ring portion 34 may have the same or different protrusion directions. In this embodiment, the outer side of the top of the side magnetic structure 24 has a relief groove 244 for avoiding the inner folded ring portion 32. This can prevent the inner folded ring portion 32 from colliding with the side magnetic structure 24 during deformation and generating noise, or causing damage to the inner folded ring portion 32. The outer folded ring portion 34 can protrude either away from the lower yoke 22 or towards the lower yoke 22, depending on the specific configuration. In this embodiment, the inner fixing portion 31, the inner folded ring portion 32, the transition portion 33, the outer folded ring portion 34, and the outer fixing portion 35 are integrally injection molded structures. To improve the rigidity of the transition portion 33, the diaphragm assembly 3 may optionally include an annular dome 36, which is disposed on the top surface of the transition portion 33.

[0053] To enable the voice coil 5 to vibrate more significantly, in one or more embodiments, the upper yoke 21 has an upper clearance groove 212 corresponding to the magnetic gap, the upper clearance groove 212 being connected to the magnetic gap; and / or, the lower yoke 22 has a lower clearance groove corresponding to the magnetic gap, the lower clearance groove being connected to the magnetic gap.

[0054] In this embodiment, the two central magnetic structures 23 are directly adjacent to each other. In other embodiments, the sound-generating unit may also include an intermediate magnetic structure. The bottom of the intermediate magnetic structure is connected to the lower yoke 22, and the top of the intermediate magnetic structure is connected to the upper yoke 21. The intermediate magnetic structure is located between two adjacent central magnetic structures 23. A portion of the magnetic gap is formed between the intermediate magnetic structure and the adjacent central magnetic structure 23. The magnetic poles of the intermediate magnetic structure and the adjacent central magnetic structure 23 face opposite directions. The upper central magnet 233, the upper yoke 21, and the upper region of the intermediate magnetic structure constitute a third type of first magnetic circuit. The lower central magnet 231, the lower yoke 22, and the lower region of the intermediate magnetic structure constitute a third type of second magnetic circuit. In one or more embodiments, the intermediate magnetic structure includes a lower intermediate magnet, an intermediate washer, and an upper intermediate magnet connected sequentially from bottom to top.

[0055] The above are merely optional embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the contents of this utility model specification and drawings under the utility model concept, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A sound emitting unit, characterized by: include A magnetic circuit assembly includes an upper yoke, a lower yoke, and a central magnetic structure and a side magnetic structure respectively disposed on the lower yoke. The upper yoke covers the central magnetic structure and the side magnetic structure. The central magnetic structure is located between at least one set of two oppositely disposed side magnetic structures. The number of central magnetic structures is multiple. The magnetic circuit assembly has multiple magnetic gaps, each corresponding to a central magnetic structure. The magnetic gaps surround the central magnetic structure and are located between the upper yoke and the lower yoke. The magnetic circuit assembly has a first magnetic loop and a second magnetic loop with opposite directions. The first magnetic loop passes through the upper part of the magnetic gap, and the second magnetic loop passes through the lower part of the magnetic gap. Multiple voice coils, each voice coil being located within a magnetic gap and corresponding to a magnetic gap; A diaphragm assembly, comprising an inner fixing part, an inner folded ring part, a transition part, an outer folded ring part, and an outer fixing part connected sequentially from the inside to the outside, wherein the inner fixing part is connected to the magnetic circuit assembly; The frame includes an inner mounting part, a connecting part, and an outer mounting part connected in sequence. The inner mounting part is connected to the voice coil, and the outer mounting part is connected to the transition part.

2. The sound producing unit of claim 1, wherein: The central magnetic structure includes a lower central magnet, a central washer, and an upper central magnet connected in sequence from bottom to top; the side magnetic structure includes a lower side magnet, a side washer, and an upper side magnet connected in sequence from bottom to top.

3. The sound-generating unit according to claim 1, characterized in that: The inner folded ring portion and the outer folded ring portion may have the same or different protrusion directions.

4. The sound-generating unit according to claim 1, characterized in that: The number of voice coils is two, and the inner mounting part connects the two voice coils simultaneously in the area where the two voice coils are close to each other.

5. The sound producing unit of claim 4, wherein: The two voice coils are connected to each other on their sides that are close to each other, or there is a gap between the two voice coils.

6. The sound producing unit of claim 4, wherein: It also includes a centering support, which includes an outer support, a cantilever, and an inner support connected in sequence. The outer support is connected to at least two sets of cantilever sections, each set of cantilever sections including at least one deformation arm. The inner mounting part is located between the two sets of cantilever sections. The inner support connected to one set of cantilever sections is connected to one voice coil, and the inner support connected to the other set of cantilever sections is connected to another voice coil.

7. The sound producing unit of claim 1, wherein: The side magnetic structure is provided corresponding to the long side of the central magnetic structure, and the connecting part is located on the outside of the end of the central magnetic structure.

8. The sound producing unit of claim 1, wherein: The outer side of the top of the side magnetic structure has a clearance groove for avoiding the inner folded ring portion.

9. The sound-generating unit according to claim 1, characterized in that: The upper yoke has an upper clearance groove corresponding to the magnetic gap, and the upper clearance groove is connected to the magnetic gap; and / or, the lower yoke has a lower clearance groove corresponding to the magnetic gap, and the lower clearance groove is connected to the magnetic gap.

10. The sound-generating unit according to claim 1, characterized in that: It also includes an intermediate magnetic structure, the bottom of which is connected to the lower yoke and the top of which is connected to the upper yoke. The intermediate magnetic structure is located between two adjacent central magnetic structures, and a portion of the magnetic gap is formed between the intermediate magnetic structure and the central magnetic structure closest to it.

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