A micro speaker

Abstract

The utility model discloses a kind of micro loudspeakers, including diaphragm component and voice coil, the diaphragm component includes middle paste, the middle paste includes body, the opposite sides of the body are respectively with the extension arm of downward bending extension, the bottom of the extension arm has the installation arm of inboard bending extension;The voice coil is sleeved on the installation arm.This micro loudspeaker both guarantees the effective suspension depth of voice coil in magnetic gap, significantly improves magnetic field utilization, BL value and BL symmetry, optimizes distortion, and also saves independent framework this part and its corresponding assembly process, realizes that high performance and low cost are obtained.Voice coil is located in the inboard of extension arm, more degree of BL value, loudness and reliability margin of micro loudspeaker is improved;The width of the folded ring part of sound film is smaller, and SD effective radiation area is larger, which is beneficial to improve the mid-frequency sensitivity of micro loudspeaker.

Description

Technical Field

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

[0002] Miniature loudspeakers, as electroacoustic conversion devices, are widely used in terminal devices such as mobile phones and tablets.

[0003] To allow the voice coil to penetrate deeper into the magnetic gap, thereby improving magnetic field utilization and increasing the BL value, some miniature loudspeakers add a frame connecting the voice coil and the diaphragm assembly. This allows the voice coil to be closer to the yoke, achieving the goal of penetrating deeper into the magnetic gap. However, the additional frame undoubtedly makes the assembly process of miniature loudspeakers more complicated, resulting in higher assembly costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a high-performance miniature loudspeaker with low assembly cost.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a miniature loudspeaker, comprising: A diaphragm assembly, the diaphragm assembly including a center patch, the center patch including a body, the body having downwardly bent extension arms on opposite sides, and the bottom of the extension arms having an inwardly bent mounting arm. A voice coil, which is fitted onto the mounting arm.

[0006] Furthermore, there is a gap between the voice coil and the body.

[0007] Furthermore, the number of voice coils is two, and the two voice coils are symmetrical in plane.

[0008] Furthermore, it also includes a centering support plate, and the extension arm is provided with a connecting part, the centering support plate being connected to the connecting part.

[0009] Furthermore, the bottom ends of the extension arm each have extension branches extending along the length of the extension arm, and the connecting portion is located on the extension branches.

[0010] Furthermore, the centering support includes an outer fixing part, a cantilever part, and an inner fixing part connected in sequence. The number of cantilever parts and the number of inner fixing parts are two each, and the cantilever parts and the inner fixing parts are arranged in a one-to-one correspondence. The two inner fixing parts on the centering support are connected to the connecting parts on the two extension arms in a one-to-one correspondence.

[0011] Furthermore, the inner fixing part is connected to the voice coil.

[0012] Furthermore, the extension arm is provided with weight-reducing holes.

[0013] Furthermore, the mounting arm is U-shaped.

[0014] Furthermore, the voice coil is wound around the mounting arm.

[0015] The beneficial effects of this utility model are as follows: This miniature loudspeaker abandons the existing technology that requires an additional independent frame to insert the voice coil into the magnetic gap. Instead, it directly bends downwards on both sides of the center-mount body to form extension arms, and further bends inwards at the bottom of the extension arms to form mounting arms. The voice coil is directly fitted onto these mounting arms, thus utilizing the center-mount's own structure to achieve the "framework" function. This ensures the effective suspension depth of the voice coil in the magnetic gap, significantly improving magnetic field utilization, BL value, and BL symmetry, and optimizing distortion. It also eliminates the need for an independent frame and its corresponding assembly process. The number of parts is reduced, and the positioning accuracy is guaranteed by the one-piece molding of the center-mount. The assembly cycle is shortened and the yield rate is improved. Ultimately, without sacrificing acoustic performance, the overall assembly cost of the miniature loudspeaker is greatly reduced, achieving a balance between high performance and low cost. The voice coil is located inside the extension arm, closer to the central magnetic component of the miniature speaker, resulting in a stronger regional magnetic field. This helps to improve the BL value and loudness of the miniature speaker to a greater extent. Moreover, the voice coil being inside the extension arm makes it less likely to touch the diaphragm's surround, making the miniature speaker vibrate more safely and providing a greater reliability margin. The narrower width of the diaphragm's surround results in a larger effective SD radiation area, which helps to improve the mid-frequency sensitivity of the miniature speaker. Attached Figure Description

[0016] Figure 1 A cross-sectional view of a miniature loudspeaker; Figure 2 This is a schematic diagram of the structure of the center mount in a miniature loudspeaker; Figure 3 This is a schematic diagram of a portion of the magnetic circuit assembly in a miniature loudspeaker. Figure 4 A schematic diagram of the structure of a miniature loudspeaker with the magnetic circuit assembly and frame concealed. Figure 5 for Figure 4 A magnified view of detail A.

[0017] Label Explanation: 1. Voice coil; 2. Sink stand; 3. Diaphragm assembly; 31. Diaphragm; 311. Inner mounting part; 312. Folded ring part; 313. Outer mounting part; 32. Center mount; 321. Body; 322. Extension arm; 3221. Connecting part; 3222. Extension branch; 3223. Weight reduction hole; 323. Mounting arm; 4. Magnetic circuit assembly; 41. Yoke; 411. Magnetic guide flange; 42. Central magnetic assembly; 421. Central magnet; 422. Central washer; 43. Side magnetic assembly; 431. Side magnet; 432. Side washer; 5. Gaps; 6. Centering support; 61. External fixation; 62. Cantilever; 63. Internal fixation. Detailed Implementation

[0018] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0019] Please refer to Figure 1 and Figure 2 A miniature loudspeaker includes a diaphragm assembly 3 and a voice coil 1. The diaphragm assembly 3 includes a center mount 32, the center mount 32 includes a body 321, the body 321 has downwardly bent extension arms 322 on opposite sides, and the bottom of the extension arms 322 has an inwardly bent mounting arm 323; the voice coil 1 is sleeved on the mounting arm 323.

[0020] As can be seen from the above description, the beneficial effects of this utility model are as follows: This miniature loudspeaker not only ensures the effective suspension depth of the voice coil 1 in the magnetic gap, significantly improving the magnetic field utilization, BL value, and BL symmetry, and optimizing distortion, but also eliminates the need for an independent frame and its corresponding assembly process, achieving both high performance and low cost. The voice coil 1 is located inside the extension arm 322, which further improves the BL value, loudness, and reliability margin of the miniature loudspeaker; the width of the folded ring portion 312 of the diaphragm 31 is small, and the effective SD radiation area is larger, which is beneficial to improving the mid-frequency sensitivity of the miniature loudspeaker.

[0021] Please refer to Figure 1 Furthermore, there is a gap 5 between the voice coil 1 and the body 321.

[0022] As can be seen from the above description, the greater the height of the gap 5, the deeper the voice coil 1 penetrates into the magnetic gap.

[0023] Please refer to Figure 1 The number of voice coils 1 is two, and further, the two voice coils 1 are symmetrical in plane.

[0024] As can be seen from the above description, the symmetry of the two voice coils in plane 1 can more effectively improve the symmetry of BL.

[0025] Please refer to Figure 4 and Figure 5 Furthermore, it also includes a centering support plate 6, and the extension arm 322 is provided with a connecting part 3221, and the centering support plate 6 is connected to the connecting part 3221.

[0026] As can be seen from the above description, the centering support 6 can correct the deviation of the voice coil 1, thereby reducing the risk of rolling vibration of the voice coil 1 and improving the manufacturing yield and experimental reliability of the miniature loudspeaker.

[0027] Please refer to Figure 2 , Figure 4 and Figure 5 Furthermore, the bottom ends of the extension arm 322 each have extension branches 3222 extending along the length direction of the extension arm 322, and the connecting part 3221 is located on the extension branches 3222.

[0028] As can be seen from the above description, the connecting part 3221 has a simple setting and stable structure, and the connecting part 3221 is easy to connect with the centering support piece 6.

[0029] Please refer to Figure 4 Furthermore, the centering support 6 includes an outer fixing part 61, a cantilever part 62, and an inner fixing part 63 connected in sequence. The number of cantilever parts 62 and the number of inner fixing parts 63 are two each, and the cantilever parts 62 and the inner fixing parts 63 are arranged in a one-to-one correspondence. The two inner fixing parts 63 on the centering support 6 are connected to the connecting parts 3221 on the two extension arms 322 in a one-to-one correspondence.

[0030] As can be seen from the above description, the centering support 6 can simultaneously correct the deviation of the two voice coils 1.

[0031] Please refer to Figure 4 and Figure 5 Furthermore, the inner fixing part 63 is connected to the voice coil 1.

[0032] As can be seen from the above description, the inner fixing part 63 of the centering support 6 connects the voice coil 1 and the connecting part 3221 at the same time, which helps to improve the structural stability of the miniature loudspeaker.

[0033] Please refer to Figure 2 Furthermore, the extension arm 322 is provided with a weight reduction hole 3223.

[0034] As can be seen from the above description, the setting of the weight reduction hole 3223 can not only reduce the manufacturing materials of the extension arm 322, but also reduce the total weight of the center patch 32, which is conducive to ensuring the sensitivity of the miniature speaker.

[0035] Please refer to Figure 2 Furthermore, the mounting arm 323 is U-shaped.

[0036] As can be seen from the above description, the U-shaped mounting arm 323 has high structural strength and can stably support the voice coil 1.

[0037] Please refer to Figure 1 and Figure 4 Furthermore, the voice coil 1 is wound on the mounting arm 323.

[0038] As described above, during the manufacturing process, the voice coil 1 is first wound directly into shape at the preset position of the center mount 32 (i.e., the position where the mounting arm 323 is formed), and then the center mount 32 is bent to form the predetermined shape of the center mount 32. This eliminates the step of applying center glue to connect the center mount 32 and the voice coil 1, thus optimizing the process and helping to further reduce the assembly cost of the miniature speaker. When bending the center mount 32 to form the predetermined shape, two bends are required. One bend forms the angle between the extension arm 322 and the mounting arm 323, and the other bend forms the angle between the extension arm 322 and the main body 321.

[0039] Embodiment 1 of this utility model is as follows: Please refer to Figure 1 and Figure 2 A miniature loudspeaker includes a voice coil 1, a frame 2, and a diaphragm assembly 3 and a magnetic circuit assembly 4 respectively connected to the frame 2. The diaphragm assembly 3 includes a connected diaphragm 31 and a center mount 32. The diaphragm 31 includes an inner mounting portion 311, a surround portion 312, and an outer mounting portion 313 connected sequentially from the inside out. The outer mounting portion 313 is connected to the frame 2. The center mount 32 includes a body 321 connected to the inner mounting portion 311. The body 321 has downwardly bent extension arms 322 on opposite sides. The bottom of each extension arm 322 has an inwardly bent mounting arm 323. Each mounting arm 323 is fitted with a vertically arranged voice coil 1. There is a gap 5 between the top of the voice coil 1 and the body 321. Please refer to... Figure 1 and Figure 4 Preferably, the two voice coils 1 are symmetrical in plane.

[0040] Please refer to Figure 1 and Figure 3 The magnetic circuit assembly 4 includes a yoke 41 and a central magnetic assembly 42 and a side magnetic assembly 43 respectively disposed on the yoke 41. The central magnetic assembly 42 is located between two oppositely disposed side magnetic assemblies 43. A magnetic gap is formed between the central magnetic assembly 42 and the side magnetic assembly 43 for the voice coil 1 to move. The central magnetic assembly 42 includes a central washer 422 and a central magnet 421 respectively connecting the central washer 422 and the yoke 41. The side magnetic assembly 43 includes a side washer 432 and a side magnet 431 respectively connecting the side washer 432 and the yoke 41. Optionally, the end of the yoke 41 has a magnetically conductive flange 411 corresponding to the end of the central magnetic assembly 42. The magnetically conductive flange 411 is formed by bending the end region of the yoke 41.

[0041] Please refer to Figure 1 In some embodiments, the basin frame 2 and the washer 432 are separate structures, which are glued, welded or interference-fitted together. In other embodiments, the basin frame 2 and the washer 432 can also be a one-piece structure, which can reduce assembly steps and reduce assembly costs. In this embodiment, the basin frame 2 is made of metal and the basin frame 2 and the washer 432 are a one-piece structure. It can be considered that the washer 432 is formed by bending a part of the basin frame 2.

[0042] Please refer to Figure 4 and Figure 5 To improve the polarization phenomenon of the voice coil 1, the miniature loudspeaker also includes a centering support 6. The extension arm 322 has a connecting part 3221, and the centering support 6 is connected to the connecting part 3221. Specifically, the centering support 6 includes an outer fixing part 61, a cantilever part 62, and an inner fixing part 63 connected in sequence. The inner fixing part 63 is connected to the connecting part 3221, and the outer fixing part 61 is connected to the frame 2. Please refer to... Figure 1 , Figure 3 and Figure 4 Preferably, a portion of the external fixing part 61 is sandwiched between the magnetically conductive folded edge 411 and the basin frame 2. In this embodiment, the top of the magnetically conductive folded edge 411 and the bottom of the basin frame 2 are respectively bonded and fixed to the external fixing part 61.

[0043] Please refer to Figure 1 and Figure 4 The centering support plate 6 is provided on the outer side of both ends of the central magnetic component 42. Optionally, the centering support plate 6 has two cantilever parts 62 and two internal fixing parts 63. The cantilever parts 62 and the internal fixing parts 63 are arranged in a one-to-one correspondence. The two internal fixing parts 63 on the centering support plate 6 are connected to the connecting parts 3221 on the two extension arms 322 in a one-to-one correspondence.

[0044] Please refer to Figure 2 , Figure 4 and Figure 5 In one or more embodiments, the bottom ends of the extension arm 322 each have extension branches 3222 extending along the length direction of the extension arm 322, and the connecting portion 3221 is located on the extension branches 3222. In this embodiment, the length of the extension arm 322 is less than the length of the voice coil 1, and the distance between the ends of the two extension branches 3222 is greater than the length of the voice coil 1. That is, the end of the extension branch 3222 protrudes relative to the end of the voice coil 1 to form the connecting portion 3221. At this time, the extension branch 3222 can stop the voice coil 1 from the outside, thereby reducing the risk of the voice coil 1 unwinding.

[0045] Please refer to Figure 4 and Figure 5 To improve the structural stability of the miniature loudspeaker, in this embodiment, the inner fixing part 63 of the centering support 6 is connected to both the connecting part 3221 and the voice coil 1. Optionally, the inner fixing part 63 is bonded and fixed to both the connecting part 3221 and the voice coil 1.

[0046] Please refer to Figure 2 In some embodiments, the extension arm 322 is provided with weight reduction holes 3223, and the number of weight reduction holes 3223 is one or more. When the number of weight reduction holes 3223 is multiple, the multiple weight reduction holes 3223 are arranged in an array.

[0047] The mounting arm 323 is U-shaped, which can improve the structural strength of the mounting arm 323 and ensure that it can support the voice coil 1.

[0048] Please refer to Figure 2 and Figure 4 In some embodiments, the voice coil 1 is wound and formed on a winding jig before being fitted onto the mounting arm 323. In other embodiments, the voice coil 1 is wound and formed on the mounting arm 323. Specifically, the mounting arm 323 is first formed by bending a metal sheet (such as a magnesium-aluminum alloy sheet or an aluminum-magnesium alloy sheet) attached to the manufacturing process 32. Then, the voice coil 1 is wound on the mounting arm 323, and the metal sheet is bent to form an extension arm 322. At this time, the gap 5 between the voice coil 1 and the body 321 allows the voice coil 1 to avoid contact with the body 321, ensuring that the voice coil 1 will not rub against the body 321 during the formation of the extension arm 322.

[0049] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A miniature loudspeaker, characterized in that, include A diaphragm assembly, the diaphragm assembly including a center patch, the center patch including a body, the body having downwardly bent extension arms on opposite sides, and the bottom of the extension arms having an inwardly bent mounting arm. A voice coil, which is fitted onto the mounting arm.

2. The miniature loudspeaker according to claim 1, characterized in that, There is a gap between the voice coil and the body.

3. The miniature loudspeaker according to claim 1, characterized in that, The number of voice coils is two, and the two voice coils are symmetrical in plane.

4. The miniature loudspeaker according to claim 1, characterized in that, It also includes a centering support plate, and the extension arm is provided with a connecting part, the centering support plate being connected to the connecting part.

5. The miniature loudspeaker according to claim 4, characterized in that, The bottom of the extension arm has extension branches at both ends that extend along the length of the extension arm, and the connecting part is located on the extension branches.

6. The miniature loudspeaker according to claim 5, characterized in that, The centering support includes an outer fixing part, a cantilever part, and an inner fixing part connected in sequence. There are two cantilever parts and two inner fixing parts. The cantilever parts and the inner fixing parts are arranged in a one-to-one correspondence. The two inner fixing parts on the centering support are connected to the connecting parts on the two extension arms in a one-to-one correspondence.

7. The miniature loudspeaker according to claim 6, characterized in that, The inner fixing part is connected to the voice coil.

8. The miniature loudspeaker according to claim 1, characterized in that, The extension arm is provided with weight reduction holes.

9. The miniature loudspeaker according to claim 1, characterized in that, The mounting arm is U-shaped.

10. The miniature loudspeaker according to claim 1, characterized in that, The voice coil is wound on the mounting arm.

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