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, the inner mounting part comprises a connecting plate and an inner side plate located on the inner side of the voice coil, and the connecting plate and the inner side plate are respectively bonded and fixed with the voice coil. The sound production unit is good in acoustic performance, and the skeleton and the voice coil are not easy to separate.

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, 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 that the bottom of the voice coil is designed with a magnetic circuit assembly. However, when the voice coil vibrates upward during operation, it moves away from the magnetic gap of the magnetic circuit assembly, resulting in poor symmetry and flatness of the BL (Body Blur). Furthermore, since only the bottom of the voice coil is within the magnetic gap, it significantly limits the amplitude increase of the sound unit.

[0004] The frame in the sound unit serves to connect the voice coil and the diaphragm assembly. When the sound unit vibrates with a large amplitude, the voice coil needs to transmit a greater driving force to the diaphragm assembly through the frame. This requires a stronger connection between the frame and the voice coil. Otherwise, the voice coil and the frame will separate, which will seriously affect the structural stability of the sound unit. Summary of the Invention

[0005] The technical problem solved by this utility model is to provide a high-performance sound unit in which the frame and voice coil are not easily separated.

[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 skeleton includes an inner mounting part, a connecting part, and an outer mounting part connected in sequence. The outer mounting part is connected to the transition part. The inner mounting part includes a connecting plate and an inner side plate located inside the voice coil. The connecting plate connects the inner side plate and the connecting part. The connecting plate and the inner side plate are respectively bonded and fixed to the voice coil.

[0011] In one embodiment, the inner mounting portion further includes an outer side plate, which connects the connecting plate and the connecting portion respectively. The connecting plate is indirectly connected to the connecting portion through the outer side plate. The outer side plate is located outside the voice coil and is bonded and fixed to the voice coil.

[0012] In one embodiment, the connecting plate is located below or above the voice coil.

[0013] In one embodiment, the height of the inner side plate is less than or equal to the height of the voice coil.

[0014] 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.

[0015] In one embodiment, the skeleton is made of magnesium-aluminum alloy or aluminum-magnesium alloy.

[0016] In one embodiment, a centering support is further included, the centering support comprising an outer support portion, a cantilever portion and an inner support portion connected in sequence, the inner support portion being connected to a voice coil, the outer support portion being connected to at least two sets of the cantilever portions, each set of the cantilever portions including at least one deformation arm, and the inner mounting portion being located between the two sets of the cantilever portions.

[0017] 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.

[0018] In one embodiment, the edge washer is provided corresponding to the center washer.

[0019] In one embodiment, the basin frame is also included, with the external fixing part and the magnetic circuit assembly respectively connected to the basin frame.

[0020] The beneficial effects of this utility model 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 will not exceed it. This improves 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 in this sound-generating unit and the long effective length of the voice coil within the magnetic gap significantly increase the BL value, thereby improving the performance of the sound-generating unit. Additionally, the voice coil and diaphragm assembly are misaligned, and the diaphragm assembly… The components do not occupy 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 unit. In addition, since the amplitude of the voice coil is greatly increased, the voice coil needs to transmit a greater driving force to the diaphragm assembly through the frame. In this unit, the connecting plate and the inner side plate of the inner mounting part are simultaneously bonded to the voice coil, effectively increasing the bonding area between the voice coil and the frame, enhancing the bonding force, reducing the risk of separation between the voice coil and the frame, and improving the structural stability of the 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 a cross-sectional view of the sound-generating unit of Embodiment 1 of this utility model;

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

[0024] Figure 3 is an enlarged view of point A in Figure 2;

[0025] Figure 4 is a schematic diagram of the internal structure of the sound-generating unit in Embodiment 1 of this utility model;

[0026] Figure 5 is a cross-sectional view of the sound-generating unit of Embodiment 2 of this utility model.

[0027] Explanation of icon numbers:

[0028] 1. Pot stand;

[0029] 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; 244. Clearance groove;

[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;

[0031] 4. Frame; 41. Internal mounting part; 411. Connecting plate; 412. Inner side plate; 413. Outer side plate; 42. Connecting part; 43. External mounting part;

[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] 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, and 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 first magnetic circuit passes through the magnetic gap. The upper part of the gap, 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 in sequence from the inside to the outside, the outer fixing part 35 is connected to the frame 1, 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 is made of magnesium-aluminum alloy, aluminum-magnesium alloy or other materials, the frame 4 includes an inner mounting part 41, a connecting part 42 and an outer mounting part 43 connected in sequence, the outer mounting part 43 is connected to the transition part 33, the inner mounting part 41 includes a connecting plate 411 and an inner side plate 412 located inside the voice coil 5, the connecting plate 411 connects the inner side plate 412 and the connecting part 42, the connecting plate 411 and the inner side plate 412 are respectively bonded and fixed to the voice coil 5.

[0042] Specifically, the outer wall of the inner side plate 412 is bonded to the inner wall of the voice coil 5. In this embodiment, the connecting plate 411 is located below the voice coil 5, and the top surface of the connecting plate 411 is bonded to the bottom surface of the voice coil 5.

[0043] To prevent the inner side plate 412 from hindering the increase of the amplitude of the sound-generating unit, the height of the inner side plate 412 is less than or equal to the height of the voice coil 5.

[0044] To further increase the bonding area between the frame 4 and the voice coil 5 and improve the bonding force between the voice coil 5 and the frame 4, the inner mounting part 41 also includes an outer side plate 413. The outer side plate 413 connects the connecting plate 411 and the connecting part 42 respectively. The connecting plate 411 is indirectly connected to the connecting part 42 through the outer side plate 413. The outer side plate 413 is located outside the voice coil 5 and is bonded and fixed to the voice coil 5. Specifically, the inner wall surface of the outer side plate 413 is bonded to the outer wall surface of the voice coil 5.

[0045] 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. The side washer 242 is positioned corresponding to the central washer 232, that is, the side washer 242 is aligned or approximately aligned with the central washer 232. 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 constitute the first magnetic circuit, and the lower yoke 22, the lower side magnet 241, and the lower central magnet 231 constitute the second magnetic circuit.

[0046] 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.

[0047] 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 including at least one deformation arm. The inner mounting portion 41 is located between the two sets of cantilever portions 62. In this embodiment, the inner mounting portion 41 is connected to the middle section of the short side of the voice coil 5, and the two inner support portions 63 are respectively located on both sides of the inner mounting portion 41 and are respectively connected to the voice coil 5. Preferably, 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.

[0048] 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.

[0049] Example 2

[0050] 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 the connecting plate 411 is located above the voice coil 5, and the bottom surface of the connecting plate 411 is bonded and fixed to the top surface of the voice coil 5.

[0051] 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 passes through the upper part of the magnetic gap, and the second magnetic loop... The magnetic circuit passes through the lower part of the magnetic gap; a voice coil, the voice coil being located within the magnetic gap; a diaphragm assembly, the diaphragm assembly comprising, from the inside out, an inner fixing part, an inner folded loop part, a transition part, an outer folded loop part, and an outer fixing part connected sequentially, the inner fixing part being connected to the magnetic circuit assembly; a frame, the frame comprising, from the inside out, an inner mounting part, a connecting part, and an outer mounting part connected sequentially, the outer mounting part being connected to the transition part, the inner mounting part comprising a connecting plate and an inner side plate located inside the voice coil, the connecting plate connecting the inner side plate and the connecting part, the connecting plate and the inner side plate being respectively bonded and fixed to the voice coil.

2. The sound-generating unit according to claim 1, characterized in that: The inner mounting part also includes an outer side plate, which connects the connecting plate and the connecting part respectively. The connecting plate is indirectly connected to the connecting part through the outer side plate. The outer side plate is located outside the voice coil and is bonded and fixed to the voice coil.

3. The sound-generating unit according to claim 1, characterized in that: The connecting plate is located below or above the voice coil.

4. The sound-generating unit according to claim 1, characterized in that: The height of the inner side plate is less than or equal to the height of the voice coil.

5. The sound-generating unit according to claim 1, characterized in that: The outer side of the top of the side magnetic structure has a clearance groove for avoiding the inner folded ring portion.

6. The sound-generating unit according to claim 1, characterized in that: The frame is made of magnesium-aluminum alloy or aluminum-magnesium alloy.

7. The sound-generating unit according to claim 1, characterized in that: It also includes a centering support, which includes an outer support, a cantilever, and an inner support connected in sequence. The inner support is connected to a voice coil. The outer support is connected to at least two sets of the cantilever, each set of the cantilever including at least one deformation arm. The inner mounting part is located between the two sets of the cantilever.

8. 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.

9. The sound-generating unit according to claim 8, characterized in that: The side washer is set in relation to the central washer.

10. The sound-generating unit according to claim 1, characterized in that: It also includes a basin frame, and the external fixing part and the magnetic circuit assembly are respectively connected to the basin frame.

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