sound production unit

Abstract

This utility model discloses a sound-generating unit, including a magnetic circuit assembly, a voice coil, a diaphragm assembly, and a frame. The magnetic circuit assembly includes an upper yoke, a lower yoke, a central magnetic structure, and first side magnets respectively disposed on the lower yoke. The upper yoke includes a body, with a set of opposite sides of the body connected to first downward pressing folds. The body covers the central magnetic structure, and the first downward pressing folds cover the first side magnets. The central magnetic structure is located between at least one set of two oppositely disposed first side magnets. The magnetic circuit assembly has a magnetic gap surrounding the central magnetic structure, 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 passes through the lower part of the magnetic gap. The diaphragm assembly includes an inner fixing part, an inner folded ring part, a middle fixing part, an outer folded ring part, and an outer fixing part connected sequentially from the inside out. The inner fixing part is connected to the magnetic circuit assembly. This sound-generating unit has high 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, electronic devices have higher and higher performance requirements for sound units. Therefore, how to improve the performance 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 sound generating 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, a central magnetic structure and a first side magnet respectively disposed on the lower yoke. The upper yoke includes a body, a set of opposite sides of which are respectively connected to a first downward pressing flange. The body covers the central magnetic structure, and the first downward pressing flange covers the first side magnet. The central magnetic structure is located between at least one set of two oppositely disposed first side magnets. The magnetic circuit assembly has a magnetic gap surrounding the central magnetic structure, the magnetic gap being 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] A voice coil, wherein the voice coil is located in the magnetic gap;

[0008] A diaphragm assembly, comprising an inner fixing part, an inner folded ring part, a middle fixing 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 middle fixing part.

[0010] In one embodiment, there are multiple central magnetic structures, multiple voice coils, and multiple magnetic gaps, and the central magnetic structures, the voice coils, and the magnetic gaps are arranged in a one-to-one correspondence.

[0011] In one embodiment, there is a gap between two adjacent voice coils, or the adjacent edges of two adjacent voice coils are bonded together.

[0012] In one embodiment, the magnetic poles of two adjacent central magnetic structures face opposite directions.

[0013] 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.

[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 central magnetic structure includes a lower central magnet, a central washer, and an upper central magnet connected sequentially from bottom to top. The upper central magnet is connected to the body, and the lower central magnet is connected to the lower yoke. The magnetic poles of the upper central magnet and the lower central magnet face opposite directions.

[0016] In one embodiment, the first downward pressing edge includes a first vertical wall and a first horizontal wall, the first vertical wall connecting the body and the first horizontal wall, the first horizontal wall corresponding to the central washer, and at least a portion of the magnetic gap is located between the first vertical wall and the upper central magnet.

[0017] In one embodiment, the magnetic circuit assembly further includes a second side magnet disposed on the lower yoke, and another set of opposite sides of the body are respectively connected to a second downward pressing fold, the second downward pressing fold covering the second side magnet.

[0018] In one embodiment, the inner fixing part is bonded to the body, and the edge of the top surface of the body is provided with a pressure groove, and at least a portion of the inner fixing part is located in the pressure groove.

[0019] The beneficial effects of this utility model are as follows: The structure of this sound-generating unit is novel. During the vibration process, both the upper and lower parts of the voice coil move within the magnetic gap and will not exceed the magnetic gap. This is beneficial to improving the symmetry, flatness, and sensitivity of the BL (Body Blur), thereby improving the acoustic performance of the sound-generating unit. The voice coil and the middle fixing part of the diaphragm assembly are staggered, so the diaphragm assembly will not occupy the space above the voice coil. This allows the voice coil to vibrate with a larger amplitude while maintaining the thinness of the sound-generating unit, which is beneficial to improving the loudness of the sound-generating unit. Moreover, the magnetic circuit assembly in this sound-generating unit has fewer components, and the magnetic circuit assembly is easy to assemble. 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 in Embodiment 1;

[0022] Figure 2 This is a cross-sectional view of the sound-generating unit in Embodiment 1;

[0023] Figure 3 This is a schematic diagram of a portion of the structure of the sound-generating unit in Embodiment 1;

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

[0025] Figure 5 This is a schematic diagram of a portion of the sound-generating unit in Embodiment 2.

[0026] Explanation of icon numbers:

[0027] 1. Pot stand;

[0028] 2. Magnetic circuit assembly; 21. Upper yoke; 211. Body; 212. First lower pressing flange; 213. Pressing groove; 214. Second lower pressing flange; 22. Lower yoke; 23. Central magnetic structure; 231. Lower central magnet; 232. Central washer; 233. Upper central magnet; 24. First side magnet; 25. Second side magnet;

[0029] 3. Diaphragm assembly; 31. Inner fixing part; 32. Inner folding ring part; 33. Middle fixing part; 34. Outer folding ring part; 35. Outer fixing part; 36. Annular dome;

[0030] 4. Frame; 41. Internal mounting part; 42. Connecting part; 43. External mounting part;

[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 first side magnet 24 respectively disposed on the lower yoke 22. The upper yoke 21 includes a body 211, and a set of opposite sides of the body 211 are respectively connected to a first downward pressing folded edge 212. The body 211 covers the central magnetic structure. On 23, the first lower pressing fold 212 covers the first side magnet 24, the central magnetic structure 23 is located between at least one set of two oppositely arranged first side magnets 24, the magnetic circuit assembly 2 has a magnetic gap around the central magnetic structure 23, the magnetic gap 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 upper part of the magnetic gap, and the second magnetic circuit passes through the lower part of the magnetic gap;

[0041] The diaphragm assembly 3 includes an inner fixing part 31, an inner folded ring part 32, a middle fixing 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, and the voice coil 5 is located in the magnetic gap. The outer mounting part 43 is connected to the middle fixing part 33.

[0042] Optionally, the inner fixing part 31 is bonded to the body 211. In this embodiment, the edge of the top surface of the body 211 is provided with a pressure groove 213, and at least a part of the inner fixing part 31 is located in the pressure groove 213. Providing a pressure groove 213 that can accommodate at least a part of the inner fixing part 31 is beneficial to the ultra-thinness of the sound unit.

[0043] 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 upper central magnet 233 is connected to the body 211, and the lower central magnet 231 is connected to the lower yoke 22. The magnetic poles of the upper central magnet 233 and the lower central magnet 231 face opposite directions. Specifically, the first downward pressing edge 212 includes a first vertical wall and a first horizontal wall. The first vertical wall connects the body 211 and the first horizontal wall, and the first horizontal wall corresponds to the central washer 232. At least a portion of the magnetic gap is located between the first vertical wall and the upper central magnet 233. 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 first vertical wall, and the upper central magnet 233 near the first vertical wall constitute a first magnetic circuit, and the lower yoke 22, the first side magnet 24, and the lower central magnet 231 near the first side magnet 24 constitute a second magnetic circuit.

[0044] In some embodiments, the voice coil 5 may be a single unit, while in other embodiments, the voice coil 5 may be multiple units. In this case, the number of central magnetic structures 23 and the number of magnetic gaps are also multiple, and the central magnetic structures 23, the voice coils 5, and the magnetic gaps are arranged in a one-to-one correspondence. When two central magnetic structures 23 are adjacent, the magnetic poles of the two adjacent central magnetic structures 23 face 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. The sound-generating unit adopts a multi-voice coil 5 architecture, which can effectively improve the magnetic utilization rate of the central magnetic structure 23 and is conducive to further improving the performance of the sound-generating unit.

[0045] In a multi-voice coil 5 architecture sound unit, there is a gap between two adjacent voice coils 5, or the adjacent edges of two adjacent voice coils 5 are bonded together. Specific methods for bonding two adjacent voice coils 5 together 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 wires wound around the voice coils 5. Connecting two adjacent voice coils 5 together helps improve the structural stability of the sound unit.

[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] 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 61, a cantilever 62, and an inner support 63 connected in sequence. Preferably, the outer support 61 is connected to at least two sets of cantilever 62, and each set of cantilever 62 includes at least one deformation arm. The inner mounting part 41 is located between the two sets of cantilever 62. One set of cantilever 62 is connected to an inner support 63 that is connected to one voice coil 5, and the other set of cantilever 62 is connected to an inner support 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.

[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, a clearance area is formed above the first horizontal wall to avoid the inner folded ring portion 32. This can prevent the inner folded ring portion 32 from colliding with the yoke 21 during deformation and generating noise, or from 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 middle fixing 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 middle fixing portion 33, the diaphragm assembly 3 may optionally include an annular dome 36, which is disposed on the top surface of the middle fixing portion 33.

[0049] Example 2

[0050] Please refer to Figure 5 The second embodiment of this utility model is a parallel technical solution to the first embodiment. The difference between the two embodiments is that the magnetic circuit assembly 2 further includes a second side magnet 25 disposed on the lower yoke 22, and the other set of opposite sides of the body 211 of the upper yoke 21 are respectively connected to a second lower pressing fold 214, which covers the second side magnet 25.

[0051] Specifically, the second downward pressing edge 214 includes a second vertical wall and a second horizontal wall. The second vertical wall connects the body 211 and the second horizontal wall, and the second horizontal wall corresponds to the central washer 232. At least a portion of the magnetic gap is located between the second vertical wall and the upper central magnet 233. It is easily understood that the upper yoke 21, the second vertical wall, and the upper central magnet 233 near the second vertical wall constitute a first magnetic circuit, and the lower yoke 22, the second side magnet 25, and the lower central magnet 231 near the second side magnet 25 constitute a second magnetic circuit.

[0052] 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: include A magnetic circuit assembly includes an upper yoke, a lower yoke, a central magnetic structure and a first side magnet respectively disposed on the lower yoke. The upper yoke includes a body, a set of opposite sides of which are respectively connected to a first downward pressing flange. The body covers the central magnetic structure, and the first downward pressing flange covers the first side magnet. The central magnetic structure is located between at least one set of two oppositely disposed first side magnets. The magnetic circuit assembly has a magnetic gap surrounding the central magnetic structure, the magnetic gap being 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 middle fixing 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 middle fixing part.

2. The sound-generating unit according to claim 1, characterized in that: The number of central magnetic structures, voice coils, and magnetic gaps are all multiple, and the central magnetic structures, voice coils, and magnetic gaps are arranged in a one-to-one correspondence.

3. The sound-generating unit according to claim 2, characterized in that: There is a gap between two adjacent voice coils, or the adjacent edges of two adjacent voice coils are bonded together.

4. The sound-generating unit according to claim 2, characterized in that: The magnetic poles of two adjacent central magnetic structures face opposite directions.

5. 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.

6. The sound-generating unit according to claim 5, 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.

7. 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 sequentially from bottom to top. The upper central magnet is connected to the main body, and the lower central magnet is connected to the lower yoke. The magnetic poles of the upper central magnet and the lower central magnet are opposite in orientation.

8. The sound-generating unit according to claim 7, characterized in that: The first downward pressing fold includes a first vertical wall and a first horizontal wall. The first vertical wall connects the body and the first horizontal wall. The first horizontal wall corresponds to the central washer. At least a portion of the magnetic gap is located between the first vertical wall and the upper central magnet.

9. The sound-generating unit according to claim 1, characterized in that: The magnetic circuit assembly also includes a second side magnet disposed on the lower yoke, and another set of opposite sides of the body are respectively connected to a second lower pressing fold, the second lower pressing fold covering the second side magnet.

10. The sound-generating unit according to claim 1, characterized in that: The internal fixing part is bonded to the body, and the edge of the top surface of the body is provided with a pressure groove, and at least a portion of the internal fixing part is located in the pressure groove.

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