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 connecting part, and a reinforcing block is arranged in the stamping convex hull. The sounding unit is stable in structure and excellent 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.

[0004] The skeleton in the sound unit serves to connect the voice coil and the diaphragm assembly. In order to reduce the impact of the skeleton on performance and its space occupation, in the existing technology, the skeleton is mostly made of lighter and thinner materials (such as aluminum-magnesium alloy, magnesium-aluminum alloy, etc.). When the suspended length of the skeleton is long, the structural strength of the suspended area of ​​the skeleton is insufficient, which will affect the vibration of the diaphragm assembly driven by the voice coil. Especially when the sound unit is operating at high frequencies, it is easy to cause split vibration, which affects the performance of the sound unit. In severe cases, the suspended area of ​​the skeleton may also bend, deform or break, affecting the life of the sound unit. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a high-performance sound unit with a stable structure.

[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 connecting part is provided with a stamped protrusion, and the stamped protrusion is provided with a reinforcing block.

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

[0012] In one embodiment, the number of stamped protrusions on the connecting portion is one, and the stamped protrusion is located on the side of the connecting portion closer to the lower yoke; or, the stamped protrusion is located on the side of the connecting portion away from the lower yoke.

[0013] In one embodiment, the number of stamped protrusions on the connecting portion is multiple, and the multiple stamped protrusions are located on the same side of the connecting portion; or, at least two stamped protrusions on the connecting portion are located on opposite sides of the connecting portion.

[0014] In one embodiment, the reinforcing block may be made of the same material or a different material than the connecting portion.

[0015] In one embodiment, the hardness of the reinforcing block material is greater than the hardness of the connecting part material.

[0016] In one embodiment, the connecting portion includes an outer vertical segment, a horizontal segment, and an inner vertical segment connected in sequence. The outer vertical segment is connected to the outer mounting portion, the inner vertical segment is connected to the inner mounting portion, and the stamped protrusion is provided on the horizontal segment.

[0017] In one embodiment, the number of voice coils and the number of central magnetic structures are both two, with each central magnetic structure corresponding to a voice coil. The inner mounting portion connects to both voice coils simultaneously in areas where they are close to each other.

[0018] 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.

[0019] 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.

[0020] The beneficial effects of this invention are as follows: The sound-generating unit has a novel structure. During vibration, both the upper and lower parts of the voice coil move within the magnetic gap and do not exceed it, which helps improve the symmetry, flatness, and sensitivity of the BL (Boundary Line) and thus enhances 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, improving the overall performance of the sound-generating unit. Additionally, the staggered arrangement of the voice coil and diaphragm assembly prevents the diaphragm assembly from occupying the space above the voice coil, allowing the sound-generating unit to maintain a slim profile. It should be noted that the voice coil can vibrate with a larger amplitude, which helps to improve the loudness of the sound unit. In addition, due to the misalignment of the transition between the voice coil and the diaphragm assembly, the length of the suspended connection in the frame is relatively long. The addition of a stamped protrusion on the connection can increase the structural strength of the connection. This sound unit also adds an additional reinforcing block inside the stamped protrusion, which further enhances the structural strength of the connection. This effectively improves the split vibration phenomenon of the sound unit under high-frequency conditions, helps to ensure the acoustic performance of the sound unit, reduces the risk of bending deformation and breakage of the connection, improves the structural stability of the sound unit, and extends the service life of the sound 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 A cross-sectional view of the sound-generating unit of Embodiment 1 of this utility model. Figure 1 ;

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

[0024] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 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] Explanation of icon numbers:

[0027] 1. Pot stand;

[0028] 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;

[0029] 3. Diaphragm assembly; 31. Inner fixing part; 32. Inner folding ring part; 33. Transition part; 34. Outer folding ring part; 35. Outer fixing part;

[0030] 4. Frame; 41. Internal mounting part; 42. Connecting part; 421. Stamped protrusion; 43. External mounting part; 44. Reinforcing block;

[0031] 5. Voice coil;

[0032] 6. Centering support; 61. External support; 62. Cantilever; 63. Internal support. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Example 1

[0040] Please refer to Figures 1 to 4 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 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 circuit and a second magnetic circuit with opposite directions. The 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 folding ring part 32, a transition part 33, an outer folding 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 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 connecting part 42 is provided with a stamped protrusion 421, and the stamped protrusion 421 is provided with a reinforcing block 44. Optionally, the thickness of the reinforcing block 44 is less than or equal to the depth of the stamped protrusion 421.

[0041] In this embodiment, the reinforcing block 44 is bonded to the stamped protrusion 421. In other embodiments, the reinforcing block 44 is welded to the stamped protrusion 421, press-fitted, or fixedly connected by other means. The reinforcing block 44 and the stamped protrusion 421 have multiple connection methods to choose from, which helps to enrich the diversity of the sound-generating unit.

[0042] In some embodiments, the number of stamped protrusions 421 on the connecting portion 42 is one, and the stamped protrusion 421 is located on the side of the connecting portion 42 closer to the lower yoke 22; or, the stamped protrusion 421 is located on the side of the connecting portion 42 away from the lower yoke 22. In other embodiments, the number of stamped protrusions 421 on the connecting portion 42 is multiple, and the multiple stamped protrusions 421 are located on the same side of the connecting portion 42; or, at least two stamped protrusions 421 on the connecting portion 42 are located on opposite sides of the connecting portion 42.

[0043] In this embodiment, there are two stamped protrusions 421 on the connecting part 42. The two stamped protrusions 421 are located on opposite sides of the connecting part 42. That is, one stamped protrusion 421 protrudes towards the lower yoke 22, and the other stamped protrusion 421 protrudes away from the lower yoke 22.

[0044] The material of the reinforcing block 44 may be the same as or different from the material of the connecting part 42. In a preferred embodiment, the hardness of the material of the reinforcing block 44 is greater than the hardness of the material of the connecting part 42.

[0045] In some embodiments, the inner mounting portion 41 is positioned above or flush with the outer fixing portion 35, while in this embodiment, the inner mounting portion 41 is connected to the lower part of the voice coil 5.

[0046] To simplify the structure of the skeleton 4, the connecting part 42 includes an outer vertical section, a horizontal section, and an inner vertical section connected in sequence. The outer vertical section connects to the outer mounting part 43, and the inner vertical section connects to the inner mounting part 41. The stamped protrusion 421 is provided on the horizontal section. In other embodiments, the connecting part 42 may not have the outer vertical section or the inner vertical section. In this case, the connecting part 42 is L-shaped or L-shaped with a 180° rotation.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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 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. A voice coil, wherein the voice coil is located in the 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. The connecting part is provided with a stamped protrusion, and the stamped protrusion is provided with a reinforcing block.

2. The sound producing unit of claim 1, wherein: 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 number of stamped protrusions on the connecting portion is one, and the stamped protrusion is located on the side of the connecting portion closer to the lower yoke; or, the stamped protrusion is located on the side of the connecting portion away from the lower yoke.

4. The sound producing unit of claim 1, wherein: The number of stamped protrusions on the connecting portion is multiple, and the multiple stamped protrusions are located on the same side of the connecting portion; or, at least two stamped protrusions on the connecting portion are located on opposite sides of the connecting portion.

5. The sound-generating unit according to claim 1, characterized in that: The reinforcing block may be made of the same material as or a different material than the connecting part.

6. The sound producing unit of claim 1, wherein: The hardness of the reinforcing block material is greater than the hardness of the connecting part material.

7. The sound producing unit of claim 1, wherein: The connecting part includes an outer vertical section, a horizontal section, and an inner vertical section connected in sequence. The outer vertical section is connected to the outer mounting part, the inner vertical section is connected to the inner mounting part, and the stamped protrusion is provided on the horizontal section.

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 two. The central magnetic structure corresponds one-to-one with the voice coil. The inner mounting part connects the two voice coils simultaneously in the area where the two voice coils are close to each other.

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

10. The sound-generating unit according to claim 1, characterized in that: 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.

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