Micro-speaker

Abstract

This utility model discloses a miniature loudspeaker, including a magnetic circuit assembly, a voice coil, and four centering supports. The magnetic circuit assembly includes a yoke and a central magnetic structure, a first side magnetic structure, and a second side magnetic structure respectively disposed on the yoke. The central magnetic structure is located between the opposing first and second side magnetic structures, and the distance between the central magnetic structure and the first side magnetic structure is smaller than the distance between the central magnetic structure and the second side magnetic structure. A notch is provided in the middle region of the side of the central magnetic structure closest to the first side magnetic structure. One side of the voice coil is located between the first side magnetic structure and the central magnetic structure, and the opposite side of the voice coil is located between the second side magnetic structure and the central magnetic structure. The inner fixing parts of the four centering supports are respectively connected to the four corners of the voice coil. The inner fixing parts of the centering supports closest to the first side magnetic structure are provided with inner solder pads that are conductive to the voice coil. The polarization phenomenon of the voice coil in this miniature loudspeaker is further improved, resulting in better acoustic performance.

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 speakers are widely used in portable electronic devices such as mobile phones, laptops, and hearing aids. With the rapid development of these portable electronic devices, people have increasingly higher requirements for the quality of the miniature speakers used in them.

[0003] In the industry, multiple centering supports are often used to correct the deviation of the voice coil in miniature loudspeakers, thereby improving the voice coil roll phenomenon and avoiding the friction noise caused by the voice coil colliding with other components. In some miniature loudspeakers, the centering supports also serve to conduct the voice coil to the external power supply. In this case, the centering support with pads has a larger area and an additional thicker layer at the pad position, so the total weight is higher than that of the centering support without pads. Therefore, when the miniature loudspeaker is working, the amplitude of the voice coil on the side connected to the centering support without pads will be greater than that on the side connected to the centering support with pads, forming a certain degree of polarization phenomenon and affecting the acoustic performance of the miniature loudspeaker. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a miniature loudspeaker with good acoustic performance.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a miniature loudspeaker, comprising:

[0006] A magnetic circuit assembly includes a yoke and a central magnetic structure, a first side magnetic structure, and a second side magnetic structure respectively disposed on the yoke. The central magnetic structure is located between the first side magnetic structure and the second side magnetic structure disposed opposite to each other. The distance between the central magnetic structure and the first side magnetic structure is smaller than the distance between the central magnetic structure and the second side magnetic structure. A notch is provided in the middle region of the side of the central magnetic structure closest to the first side magnetic structure.

[0007] A voice coil, wherein one side of the voice coil is located between the first side magnetic structure and the central magnetic structure, and the opposite side of the voice coil is located between the second side magnetic structure and the central magnetic structure;

[0008] Four centering supports are provided, and the inner fixing parts of the four centering supports are respectively connected to the four corners of the voice coil. The inner fixing parts of the centering supports, which are located near the first side magnetic structure, are provided with inner solder pads that are in communication with the voice coil.

[0009] In one embodiment, the central magnetic structure includes a central washer and a central magnet connecting the central washer and the yoke, with at least a portion of the notch located on the central magnet.

[0010] In one embodiment, the notch extends through the top surface of the central washer and the bottom surface of the central magnet.

[0011] In one embodiment, the distance between the inner wall of the notch and the first side magnetic structure is equal to the distance between the second side magnetic structure and the central magnet.

[0012] In one embodiment, the centering support further has a cantilever portion and an outer fixing portion, the cantilever portion being connected to the outer fixing portion and the inner fixing portion respectively, and the outer fixing portion of the centering support having the inner solder pad is provided with an outer solder pad that is in communication with the inner solder pad.

[0013] In one embodiment, the external fixing portions of at least two of the centering supports are connected to form an integral structure.

[0014] In one embodiment, the inner fixing portions of at least two of the centering supports are connected to form an integral structure.

[0015] In one embodiment, the device further includes a frame and a diaphragm assembly, wherein the outer fixing portion of the centering support and the diaphragm assembly are respectively connected to the frame, and the voice coil is connected to the diaphragm assembly.

[0016] In one embodiment, the inner fixing portion of the centering support is connected to the bottom of the voice coil.

[0017] In one embodiment, the inner fixing part and the outer fixing part of the centering support are respectively fixedly connected to the diaphragm assembly, and the inner fixing part is located above the voice coil.

[0018] The beneficial effects of this invention are as follows: In this miniature loudspeaker, the central magnetic structure is offset towards the centering support plate with the inner solder pad, making the magnetic gap width between the first side magnetic structure and the central magnetic structure smaller than the magnetic gap width between the second side magnetic structure and the central magnetic structure. The asymmetrical magnetic gap compensates for the amplitude loss caused by the nonlinearity of the mechanical suspension and the self-weight of the internal fixed part, thereby making the amplitude of each region of the voice coil tend to be consistent. By adjusting the position, depth, and shape of the notch, the magnetic flux distribution of the magnetic gap between the first side magnetic structure and the central magnetic structure can be controlled, which further improves the polarization phenomenon of the voice coil, thereby improving the acoustic performance of the miniature loudspeaker. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a top view of the miniature loudspeaker in Embodiment 1, showing the hidden diaphragm assembly.

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of the internal structure of the miniature loudspeaker in Embodiment 1;

[0023] Figure 4 This is a schematic diagram of the central magnetic structure in the miniature loudspeaker of Embodiment 1.

[0024] Explanation of icon numbers:

[0025] 1. Pot stand;

[0026] 2. Diaphragm assembly;

[0027] 31. Yoke; 32. Central magnetic structure; 321. Notch; 3211. Inner wall surface; 322. Central magnet; 323. Central washer; 33. First lateral magnetic structure; 34. Second lateral magnetic structure;

[0028] 4. Voice coil;

[0029] 5. Centering support; 51. Internal fixation part; 52. Cantilever part; 53. External fixation part; 54. Inner solder pad; 55. Outer solder pad. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Furthermore, if the meaning of "and / or" in the entire text is to include three parallel solutions, taking "and A / or B" as an example, it includes solution A, solution B, and a solution that simultaneously satisfies both A and B. 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 cannot be implemented, 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.

[0035] 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.

[0036] Example 1

[0037] Please refer to Figures 1 to 4 The first embodiment of this utility model is a miniature loudspeaker, including a frame 1, a diaphragm assembly 2, a magnetic circuit assembly, a voice coil 4 and four centering supports 5. The diaphragm assembly 2 and the magnetic circuit assembly are respectively connected to the frame 1, and the voice coil 4 is connected to the diaphragm assembly 2. The diaphragm assembly 2 includes a diaphragm and a dome connected to the diaphragm.

[0038] The magnetic circuit assembly includes a yoke 31 and a central magnetic structure 32, a first side magnetic structure 33, and a second side magnetic structure 34 respectively disposed on the yoke 31. The central magnetic structure 32 is located between the opposing first side magnetic structures 33 and second side magnetic structures 34. The distance between the central magnetic structure 32 and the first side magnetic structure 33 is smaller than the distance between the central magnetic structure 32 and the second side magnetic structure 34. That is, a first magnetic gap is formed between the first side magnetic structure 33 and the central magnetic structure 32, and a second magnetic gap is formed between the second side magnetic structure 34 and the central magnetic structure 32. The width of the first magnetic gap is smaller than the width of the second magnetic gap. One side of the voice coil 4 is located between the first side magnetic structure 33 and the central magnetic structure 32, i.e., in the first magnetic gap. The other side of the voice coil 4 is located between the second side magnetic structure 34 and the central magnetic structure 32, i.e., in the second magnetic gap. A notch 321 is provided in the middle region of the central magnetic structure 32 near the first side magnetic structure 33. The notch 321 communicates with the first magnetic gap. Specifically, the first side magnetic structure 33 includes a first side washer and a first side magnet connecting the first side washer and the yoke 31; the second side magnetic structure 34 includes a second side washer and a second side magnet connecting the second side washer and the yoke 31; the central magnetic structure 32 includes a central washer 323 and a central magnet 322 connecting the central washer 323 and the yoke 31.

[0039] The voice coil 4 is rectangular, and the inner fixing portions 51 of the four centering supports 5 are respectively connected to the four corners of the voice coil 4. The inner fixing portions 51 of the centering supports 5, which are located near the first side magnetic structure 33, are provided with inner solder pads 54 that are conductive to the voice coil 4. Further, the centering supports 5 also have cantilever portions 52 and outer fixing portions 53. The outer fixing portions 53 are connected to the frame 1, and the cantilever portions 52 are respectively connected to the outer fixing portions 53 and the inner fixing portions 51. The outer fixing portions 53 of the centering supports 5, which have the inner solder pads 54, are provided with outer solder pads 55 that are conductive to the inner solder pads 54.

[0040] To facilitate the assembly and manufacturing of the miniature loudspeaker, at least two of the outer fixing portions 53 of the centering support 5 are connected to form an integral structure. Similarly, in other embodiments, at least two of the inner fixing portions 51 of the centering support 5 are connected to form an integral structure.

[0041] In this embodiment, the inner fixing part 51 of the centering support 5 is connected to the bottom of the voice coil 4. In other embodiments, the inner fixing part 51 and the outer fixing part 53 of the centering support 5 are respectively fixedly connected to the diaphragm assembly 2, and the inner fixing part 51 is located above the voice coil 4.

[0042] At least a portion of the notch 321 is located on the central magnet 322. For ease of processing, in this embodiment, the notch 321 extends through the top surface of the central washer 323 and the bottom surface of the central magnet 322.

[0043] In one or more embodiments, the distance between the inner wall surface 3211 of the notch 321 and the first side magnetic structure 33 is equal to the distance between the second side magnetic structure 34 and the central magnet 322. In this case, it can be considered that the magnetic flux of the first magnetic gap is enhanced only in the region near the inner fixing portion 51 with the inner pad 54.

[0044] 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 inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A miniature loudspeaker, characterized in that: include A magnetic circuit assembly includes a yoke and a central magnetic structure, a first side magnetic structure, and a second side magnetic structure respectively disposed on the yoke. The central magnetic structure is located between the first side magnetic structure and the second side magnetic structure disposed opposite to each other. The distance between the central magnetic structure and the first side magnetic structure is smaller than the distance between the central magnetic structure and the second side magnetic structure. A notch is provided in the middle region of the side of the central magnetic structure closest to the first side magnetic structure. A voice coil, wherein one side of the voice coil is located between the first side magnetic structure and the central magnetic structure, and the opposite side of the voice coil is located between the second side magnetic structure and the central magnetic structure; Four centering supports are provided, and the inner fixing parts of the four centering supports are respectively connected to the four corners of the voice coil. The inner fixing parts of the centering supports, which are located near the first side magnetic structure, are provided with inner solder pads that are in communication with the voice coil.

2. The miniature loudspeaker according to claim 1, characterized in that: The central magnetic structure includes a central washer and a central magnet connecting the central washer and the yoke, with at least a portion of the notch located on the central magnet.

3. The miniature loudspeaker according to claim 2, characterized in that: The notch connects the top surface of the central washer to the bottom surface of the central magnet.

4. The miniature loudspeaker according to claim 2, characterized in that: The distance between the inner wall of the notch and the first side magnetic structure is equal to the distance between the second side magnetic structure and the central magnet.

5. The miniature loudspeaker according to claim 1, characterized in that: The centering support also has a cantilever portion and an outer fixing portion. The cantilever portion is connected to the outer fixing portion and the inner fixing portion respectively. The outer fixing portion of the centering support with the inner solder pad is provided with an outer solder pad that is in communication with the inner solder pad.

6. The miniature loudspeaker according to claim 5, characterized in that: At least two of the centering supports have their external fixing parts connected to form an integral structure.

7. The miniature loudspeaker according to claim 5, characterized in that: The internal fixing parts of at least two of the centering supports are connected to form an integral structure.

8. The miniature loudspeaker according to claim 5, characterized in that: It also includes a frame and a diaphragm assembly, wherein the outer fixing part of the centering support and the diaphragm assembly are respectively connected to the frame, and the voice coil is connected to the diaphragm assembly.

9. The miniature loudspeaker according to claim 8, characterized in that: The inner fixing part of the centering support is connected to the bottom of the voice coil.

10. The miniature loudspeaker according to claim 8, characterized in that: The inner and outer fixing parts of the centering support are respectively fixedly connected to the diaphragm assembly, with the inner fixing part located above the voice coil.

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