Sound production unit

Abstract

The utility model discloses a sounding unit, which comprises a magnetic circuit assembly, a voice coil, a diaphragm assembly and a framework, the magnetic circuit assembly comprises an upper yoke, a lower yoke, a central magnetic structure and an edge magnetic structure, the central magnetic structure and the edge magnetic structure 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 magnetic gap, the magnetic gap surrounds the central magnetic structure, the magnetic gap is located between the upper yoke and the lower yoke, 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 second magnetic loop passes through the lower part 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, the outer mounting part is connected with the transition part, a stamping convex hull is arranged on the outer mounting part, and a reinforcing block is arranged in the stamping convex hull. The sound production unit is weak in high-frequency segmentation vibration phenomenon and has high performance.

Description

Sound unit 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, electronic devices have higher and higher requirements for the amplitude of the sound units. Therefore, how to increase the amplitude of the 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.

[0004] The frame in a driver unit connects the voice coil and the diaphragm assembly. To minimize the frame's impact on performance and space occupation, current technologies often use lightweight and thin materials for the frame. This results in insufficient structural strength of the frame's external mounting section, weakening its ability to suppress splitting vibrations that occur at high frequencies. Consequently, the high-frequency response of the driver unit experiences a significant drop, affecting product performance. Moreover, the splitting vibration phenomenon is more pronounced at high frequencies in large-amplitude drivers, making the structural strength of the frame's external mounting section particularly crucial. Summary of the Invention

[0005] The technical problem solved by this utility model is to provide a high-performance sound generating unit with weak high-frequency segmentation vibration phenomenon.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a sound-generating unit, comprising:

[0007] 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 magnetic circuit assembly has a magnetic gap surrounding the central magnetic structure and 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.

[0008] A voice coil, wherein the voice coil is located in the magnetic gap;

[0009] 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;

[0010] 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. The outer mounting part is provided with a stamped protrusion, and a reinforcing block is provided inside the stamped protrusion.

[0011] In one embodiment, the reinforcing block is bonded, welded, or interference-fitted to the stamped convex bulge.

[0012] In one embodiment, the reinforcing block may be made of the same material or a different material than the external mounting portion.

[0013] In one embodiment, the hardness of the reinforcing block material is greater than the hardness of the material of the outer mounting part.

[0014] In one embodiment, the convex hull is generally in the shape of a ring frame.

[0015] In one embodiment, the number of convex hulls is multiple.

[0016] In one embodiment, the cross-section of the stamped bulge is rectangular or stepped.

[0017] In one embodiment, there are multiple voice coils and multiple central magnetic structures, with each central magnetic structure corresponding to a voice coil.

[0018] 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.

[0019] 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.

[0020] 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) band, 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 enhancing the unit's performance. Additionally, the staggered arrangement of the voice coil and diaphragm assembly prevents the diaphragm from occupying the space above the voice coil, allowing the voice coil to vibrate with a larger amplitude while maintaining a slim profile, thus improving the loudness of the sound-generating unit. Moreover, the innovative design of the magnetic circuit components enables a larger amplitude vibration, which exacerbates the high-frequency split vibration phenomenon. However, the stamped protrusions on the outer mounting portion of the frame and the reinforcing blocks within them improve the rigidity of the outer mounting portion, effectively mitigating the high-frequency split vibration phenomenon and laying the foundation for high acoustic performance in the sound-generating unit. Attached Figure Description

[0021] 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.

[0022] Figure 1 is an exploded view of the sound-generating unit of Embodiment 1;

[0023] Figure 2 is a cross-sectional view of the sound-generating unit of Embodiment 1;

[0024] Figure 3 is a second cross-sectional view of the sound-generating unit of Embodiment 1;

[0025] Figure 4 is a schematic diagram of the structure of the sound-generating unit after the diaphragm assembly and upper yoke are hidden in Embodiment 1;

[0026] Figure 5 is a schematic diagram of the structure of the sound-generating unit after the diaphragm assembly and upper yoke are hidden in Embodiment 2;

[0027] Figure 6 is a cross-sectional view of the sound-generating unit of Embodiment 3.

[0028] Explanation of icon numbers:

[0029] 1. Pot stand;

[0030] 2. Magnetic circuit assembly; 21. Upper yoke; 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;

[0031] 3. Diaphragm assembly; 31. Inner fixing part; 32. Inner folding ring part; 33. Transition part; 34. Outer folding ring part; 35. Outer fixing part;

[0032] 4. Frame; 41. Internal mounting part; 42. Connecting part; 43. External mounting part; 431. Stamped protrusion; 44. Reinforcing block;

[0033] 5. Voice coil;

[0034] 6. Centering support; 61. External support; 62. Cantilever; 63. Internal support. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Example 1

[0042] Referring to Figures 1 to 4, Embodiment 1 of this utility model is as follows: a sound-generating unit includes a frame 1, a magnetic circuit assembly 2, a diaphragm assembly 3, a frame 4, and a voice coil 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. The magnetic circuit assembly 2 has a magnetic gap. The voice coil 5 is located in the magnetic gap. The magnetic gap surrounds the central magnetic structure 23 and is located between the upper yoke 21 and the lower yoke 22. The magnetic circuit assembly 2 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 yoke 22. 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 outer fixing part 35 is connected to the frame 1, and the inner fixing part 31 is connected to the magnetic circuit assembly 2. Preferably, the inner fixing part 31 is connected to the upper yoke 21. The material of the frame 4 can be magnesium-aluminum alloy, aluminum-magnesium alloy, etc. 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, and the outer mounting part 43 is connected to the transition part 33. The outer mounting part 43 is provided with a stamped protrusion 431, and the stamped protrusion 431 is provided with a reinforcing block 44. When the outer mounting part 43 and the transition part 33 are bonded and fixed, the hollow stamped protrusion 431 can also act as a glue-filling groove, thereby improving the bonding and fixing effect between the frame 4 and the diaphragm assembly 3.

[0043] In this embodiment, the reinforcing block 44 is bonded to the stamped protrusion 431. In other embodiments, the reinforcing block 44 is welded to the stamped protrusion 431, press-fitted, or fixedly connected by other means. The reinforcing block 44 and the stamped protrusion 431 have multiple connection methods to choose from, which helps to enrich the diversity of the sound-generating unit.

[0044] In one or more embodiments, the external mounting portion 43 is generally in the shape of a ring frame. The overall ring frame shape of the external mounting portion 43 facilitates the assembly with the diaphragm assembly 3 and also has higher structural strength.

[0045] In this embodiment, the stamping protrusion 431 is an integral structure in the shape of a ring frame. In this case, the reinforcing block 44 can be a continuous ring frame structure. In other embodiments, the number of stamping protrusions 431 can be multiple. In this case, the stamping protrusions 431 can be in the shape of a strip or other shapes. In this case, each stamping protrusion 431 is provided with the reinforcing block 44.

[0046] The material of the reinforcing block 44 may be the same as or different from the material of the outer mounting part 43. In a preferred embodiment, the hardness of the material of the reinforcing block 44 is greater than the hardness of the material of the outer mounting part 43.

[0047] The cross-section of the stamped protrusion 431 is rectangular or other shapes, and preferably the reinforcing block 44 is adapted to the hollow area of ​​the stamped protrusion 431.

[0048] In some embodiments, the number of voice coils 5 and the number of central magnetic structures 23 are both multiple, with multiple voice coils 5 arranged side by side, and each central magnetic structure 23 corresponding to a voice coil 5. In this case, the number of magnetic gaps in the sound-generating unit is also multiple, and each magnetic gap corresponds to a voice coil 5. In this embodiment, the number of voice coils 5 is two, and the inner mounting part 41 connects the two voice coils 5 simultaneously in the areas where they are close to each other. This arrangement not only simplifies the structure of the frame 4 and facilitates the production of the frame 4 and the assembly of the frame 4 and the voice coils 5, but also effectively improves the synchronicity of the operation 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 parts 41 on one side, with multiple inner mounting parts 41 connected to each voice coil 5 in a one-to-one correspondence. The multi-voice coil architecture of the sound-generating unit can achieve a higher magnetic utilization rate for the magnetic circuit component 2, and the effective length of the voice coil 5 in the magnetic gap is longer, which is beneficial to further improving the performance of the sound-generating unit.

[0049] 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 there are multiple central magnetic structures 23, when two central magnetic structures 23 are directly 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.

[0050] 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.

[0051] 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.

[0052] To improve the polarization phenomenon of the voice coil 5, the sound-generating unit further 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. The inner support portion 63 connected to one set of cantilever portions 62 is connected to one voice coil 5, and the inner support portion 63 connected to the other set of cantilever portions 62 is connected to another voice coil 5. When the number of voice coils 5 is one, the inner support portions 63 connected to the two sets of cantilever portions 62 are connected to the same voice coil 5.

[0053] The centering support 6 is an FPC board, and the voice coil 5 is connected to an external power source through the centering support 6. When there are multiple voice coils 5, the multiple voice coils 5 are connected in series or in parallel through the centering support 6.

[0054] Example 2

[0055] Please refer to Figure 5. Embodiment 2 of this utility model is a parallel technical solution to Embodiment 1. The difference between Embodiment 1 and Embodiment 2 is that: in this embodiment, there are multiple stamped protrusions 431 on the outer mounting part 43. Specifically, each side of the outer mounting part 43 is provided with the stamped protrusions 431.

[0056] Example 3

[0057] Please refer to Figure 6. Embodiment 3 of this utility model is a parallel technical solution to Embodiment 1. The difference between Embodiment 3 and Embodiment 1 is that in this embodiment, the cross-section of the stamping convex 431 is stepped, and correspondingly, the cross-section of the reinforcing block 44 is also stepped. Optionally, the cross-section of the reinforcing block 44 is T-shaped.

[0058] 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-generating unit, characterized in that: The 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 structures. The central magnetic structure is located between at least one set of two oppositely disposed side magnetic structures. The magnetic circuit assembly has a magnetic gap surrounding the central magnetic structure and located between the upper and lower yokes. The magnetic circuit assembly has a first magnetic loop and a second magnetic loop with opposite directions, the first magnetic loop passing through the magnetic gap. The upper part of the magnetic circuit passes through the lower part of the magnetic gap; the voice coil is located in the magnetic gap; the diaphragm assembly includes an inner fixing part, an inner folded ring part, a transition part, an outer folded ring part, and an outer fixing part connected in sequence from the inside to the outside, the inner fixing part being 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 being connected to the voice coil, the outer mounting part being connected to the transition part, the outer mounting part being provided with a stamped protrusion, and the stamped protrusion being provided with a reinforcing block.

2. The sound-generating unit according to claim 1, characterized in that: The reinforcing block is bonded, welded, or interference-fitted to the stamped convex bulge.

3. The sound-generating unit according to claim 1, characterized in that: The material of the reinforcing block may be the same as or different from the material of the external mounting part.

4. The sound-generating unit according to claim 1, characterized in that: The hardness of the reinforcing block material is greater than the hardness of the material of the external mounting part.

5. The sound-generating unit according to claim 1, characterized in that: The stamped convex bulge is generally in the shape of a ring frame.

6. The sound-generating unit according to claim 1, characterized in that: The number of stamped protrusions is multiple.

7. The sound-generating unit according to claim 1, characterized in that: The cross-section of the stamped convex bulge is rectangular or stepped.

8. The sound-generating unit according to claim 1, characterized in that: The number of voice coils and the number of central magnetic structures are both multiple, and the central magnetic structure corresponds one-to-one with the voice coil.

9. The sound-generating unit according to claim 8, 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.

10. The sound-generating unit according to claim 9, characterized in that: 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.

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