Miniature speaker

Abstract

This utility model discloses a miniature loudspeaker, including a diaphragm assembly and a voice coil. The diaphragm assembly includes a center mount, which includes a body. The body has downwardly bent extension arms on opposite sides, and the bottom of each extension arm has an outwardly bent mounting arm. The voice coil is fitted onto the mounting arm. This miniature loudspeaker ensures effective suspension depth of the voice coil in the magnetic gap, significantly improving magnetic field utilization, BL value, and BL symmetry, optimizing distortion. It also eliminates the need for a separate frame and its corresponding assembly process, achieving a balance between high performance and low cost. The voice coil is located outside the extension arms, allowing for a wider diaphragm surround, thereby improving the low-frequency acoustic performance of the miniature loudspeaker.

Description

Technical Field

[0001] This utility model relates to the field of electroacoustic converter technology, and in particular to miniature loudspeakers. 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 outwardly bent mounting arm. A voice coil, which is fitted onto the mounting arm.

[0006] Furthermore, the number of voice coils is two, and the two voice coils are symmetrical in plane.

[0007] Furthermore, the diaphragm assembly also includes a diaphragm, which comprises an inner mounting portion, a surround portion, and an outer mounting portion connected sequentially from the inside to the outside, with a portion of the surround portion located directly above the voice coil.

[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 outwards 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 not only 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, but also eliminates the need for an independent frame and its corresponding assembly process. The number of parts is reduced, the positioning accuracy is guaranteed by the one-time 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 on the outside of the extension arm, allowing for a wider surround portion of the diaphragm, thereby reducing the F0 of the miniature speaker and enhancing the low-frequency response. The wider surround portion can physically allow for a larger linear displacement of the diaphragm assembly, maintaining relative stiffness stability over a greater range of motion. This significantly reduces nonlinear distortion at high volumes or large amplitudes at low frequencies, resulting in a cleaner, more faithful sound. It also indirectly increases the maximum output sound pressure level, enabling even small speakers to produce louder sounds. 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. Centering support; 51. External fixation; 52. Cantilever; 53. 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 Figures 1 to 2 A miniature loudspeaker includes a diaphragm assembly 3 and a voice coil 1. The diaphragm assembly 3 includes a center mount 32, which 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 outwardly 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 outside the extension arm 322, allowing the surround portion 312 of the diaphragm 31 to have a larger width, thereby improving the low-frequency acoustic performance of the miniature loudspeaker.

[0021] Please refer to Figure 1 and Figure 4 Furthermore, the number of voice coils 1 is two, and the two voice coils 1 are symmetrical in plane.

[0022] 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.

[0023] Please refer to Figure 1 Furthermore, the diaphragm assembly 3 also includes a diaphragm 31, which includes an inner mounting portion 311, a folded ring portion 312, and an outer mounting portion 313 connected sequentially from the inside to the outside. A portion of the folded ring portion 312 is located directly above the voice coil 1.

[0024] As can be seen from the above description, without increasing the overall size of the miniature loudspeaker, the space directly above the voice coil 1 is utilized by the surround portion 312 of the diaphragm 31, which widens the width of the surround portion 312 and thus improves the low-frequency acoustic performance of the miniature loudspeaker.

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

[0026] As can be seen from the above description, the centering support 5 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 5.

[0029] Please refer to Figure 4 Furthermore, the centering support 5 includes an outer fixing part 51, a cantilever part 52, and an inner fixing part 53 connected in sequence. The number of cantilever parts 52 and the number of inner fixing parts 53 are two each, and the cantilever parts 52 and the inner fixing parts 53 are arranged in a one-to-one correspondence. The two inner fixing parts 53 on the centering support 5 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 5 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 53 is connected to the voice coil 1.

[0032] As can be seen from the above description, the inner fixing part 53 of the centering support 5 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 and Figure 4 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 1 and 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 around the mounting arm 323.

[0038] As described above, during the manufacturing process, the metal sheet can be first formed into a center mount 32 using a bending forming process. Then, the voice coil 1 can be directly wound onto the mounting arm 323 of the center mount 32, eliminating the need to apply center glue to connect the center mount 32 and the voice coil 1. This process is relatively optimized and helps to further reduce the assembly cost of the miniature loudspeaker.

[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 to the outside. 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 the extension arms 322 has an outwardly bent mounting arm 323. Each mounting arm 323 is fitted with a vertically arranged voice coil 1. Preferably, a portion of the surround portion 312 is located directly above the voice coil 1, which allows for a larger horizontal width of the surround portion 312. To improve the symmetry of the miniature loudspeaker BL, please refer to... Figure 1 and Figure 4 In this embodiment, the two voice coils 1 are symmetrical in plane.

[0040] Please refer to Figure 1 and Figure 3The 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 5. The extension arm 322 has a connecting portion 3221, and the centering support 5 is connected to the connecting portion 3221. Specifically, the centering support 5 includes an outer fixing portion 51, a cantilever portion 52, and an inner fixing portion 53 connected in sequence. The inner fixing portion 53 is connected to the connecting portion 3221, and the outer fixing portion 51 is connected to the frame 2. Please refer to... Figure 1 , Figure 3 and Figure 4 Preferably, a portion of the external fixing part 51 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 51.

[0043] Please refer to Figure 1 and Figure 4 The centering support plate 5 is provided on the outer side of both ends of the central magnetic component 42. Optionally, the centering support plate 5 has two cantilever parts 52 and two internal fixing parts 53. The cantilever parts 52 and the internal fixing parts 53 are arranged in a one-to-one correspondence. The two internal fixing parts 53 on the centering support plate 5 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 inside, 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 53 of the centering support 5 is simultaneously connected to the connecting part 3221 and the voice coil 1. Optionally, the inner fixing part 53 is bonded and fixed to the connecting part 3221 and the voice coil 1 respectively.

[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 shaped on a winding jig before being fitted onto the mounting arm 323. In other embodiments, the voice coil 1 is wound and shaped on the mounting arm 323. Specifically, the metal sheet (such as magnesium-aluminum alloy sheet, aluminum-magnesium alloy sheet, etc.) used to manufacture the center patch 32 is first bent to form the center patch 32, and then the voice coil 1 is directly wound on the mounting arm 323 of the center patch 32.

[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 outwardly bent mounting arm. A voice coil, which is fitted onto the mounting arm.

2. 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.

3. The miniature loudspeaker according to claim 1, characterized in that, The diaphragm assembly also includes a diaphragm, which comprises an inner mounting portion, a surround portion, and an outer mounting portion connected sequentially from the inside to the outside, with a portion of the surround portion located directly above the voice coil.

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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