Miniature speaker

Abstract

This utility model discloses a miniature loudspeaker, including a magnetic circuit assembly, a voice coil, and a resonant assembly. 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 central magnetic structure is located between two oppositely disposed side magnetic structures, forming a magnetic gap between the central magnetic structure and the side magnetic structures. The upper yoke covers the central magnetic structure and the side magnetic structures. 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. The resonant assembly includes a frame and a ring-shaped diaphragm assembly. The diaphragm assembly includes a transition section. The frame includes an inner connecting section, a clearance section, and an outer connecting section connected sequentially. The outer connecting section connects to the transition section. The inner connecting section is inclined relative to the outer wall surface of the voice coil to form a triangular cross-section rubber groove with the outer wall surface of the voice coil. This miniature loudspeaker has a large upper vibration amplitude and high 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 higher and higher requirements for the miniature speakers used in them. How to improve the acoustic performance of miniature speakers in a limited space has always been a research direction for practitioners.

[0003] In the prior art, there is a sandwich design of magnet-washer-reverse magnet. This design allows the voice coil to vibrate continuously within the magnetic gap without leaving the magnetic gap, thereby ensuring the BL symmetry and flatness of the miniature loudspeaker. However, in this design, the inner connecting part of the skeleton connecting the diaphragm assembly is fixed on the top surface of the voice coil, which hinders the further increase of the vibration amplitude on the voice coil. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a high-performance miniature loudspeaker with a large upper vibration amplitude.

[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 an upper yoke, a lower yoke, and a central magnetic structure and a side magnetic structure respectively disposed on the lower yoke. The central magnetic structure is located between two oppositely disposed side magnetic structures, forming a magnetic gap between the central magnetic structure and the side magnetic structures. The upper yoke covers the central magnetic structure and the side magnetic structures. The central magnetic structure includes a lower central magnet, a central washer, and an upper central magnet connected sequentially from bottom to top, with the magnetic poles of the lower central magnet and the upper central magnet facing opposite directions. The side magnetic structure includes a lower side magnet, a side washer, and an upper side magnet connected sequentially from bottom to top, with the magnetic poles of the lower magnet and the upper magnet facing opposite directions.

[0007] A voice coil, wherein the voice coil is located in the magnetic gap;

[0008] A vibration assembly includes a frame and a ring-shaped diaphragm assembly. The diaphragm assembly includes an inner fixing part, an inner folded loop part, a transition part, an outer folded loop part, and an outer fixing part connected sequentially from the inside to the outside. The inner fixing part is connected to the upper yoke. The frame includes an inner connecting part, a clearance part, and an outer connecting part connected sequentially. The outer connecting part is connected to the transition part. The clearance part is used to avoid the inner folded loop part. The inner connecting part is located outside the voice coil and is bonded and fixed to the outer wall surface of the voice coil. The inner connecting part is inclined relative to the outer wall surface of the voice coil to form a triangular adhesive groove with the outer wall surface of the voice coil.

[0009] In one embodiment, the upper yoke has a clearance groove for avoiding the voice coil and the inner connecting portion.

[0010] In one embodiment, the top of the inner connection portion is positioned below or flush with the top surface of the voice coil.

[0011] In one embodiment, the diaphragm assembly includes an inner diaphragm, an outer diaphragm, and a connecting frame. The inner folded ring portion and the inner fixing portion are disposed on the inner diaphragm, the outer folded ring portion and the outer fixing portion are disposed on the outer diaphragm, and the connecting frame connects the inner diaphragm and the outer diaphragm to form the transition portion.

[0012] In one embodiment, the outer connecting portion of the skeleton is generally in the shape of a ring frame, and the avoidance portion is connected to the opposite two sides of the outer connecting portion.

[0013] In one embodiment, the avoidance portion is provided with a reinforcing plate.

[0014] In one embodiment, the device further includes a frame and a centering support. The frame connects the outer fixing part and the lower yoke. The centering support includes an inner mounting part, a cantilever 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 frame.

[0015] In one embodiment, the inner mounting portion has an inner pad electrically connected to the voice coil, and the outer mounting portion has an outer pad electrically connected to the inner pad.

[0016] In one embodiment, the four corners of the voice coil are respectively connected to the inner mounting portion.

[0017] In one embodiment, a fixing ring frame is further included, at least a portion of the inner fixing part is sandwiched between the fixing ring frame and the upper yoke, and the upper magnet is indirectly connected to the upper yoke through the fixing ring frame.

[0018] The beneficial effects of this utility model are as follows: This miniature loudspeaker has a novel structure, with the diaphragm assembly and voice coil misaligned. Furthermore, the central magnetic structure and the side magnetic structure employ a sandwich design of magnet-washer-reverse magnet, ensuring the voice coil remains within the magnetic gap during vibration. This guarantees the symmetry and flatness of the miniature loudspeaker BL, thereby improving its performance. The inner connecting part of the frame is positioned outside the voice coil, forming a triangular adhesive groove between it and the outer wall of the voice coil. This groove can hold more adhesive, compensating for the reduced bonding area between the inner connecting part and the voice coil due to the removal of the area connecting to the top surface of the voice coil. This ensures the stability of the connection between the frame and the voice coil. Moreover, since the top surface of the voice coil no longer has an inner connecting part, the inner connecting part will not collide with the upper yoke when the voice coil vibrates upwards at a greater amplitude, further 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 A cross-sectional view of the miniature loudspeaker according to Embodiment 1 of this utility model. Figure 1 ;

[0021] Figure 2 A cross-sectional view of the miniature loudspeaker according to Embodiment 1 of this utility model. Figure 2 ;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a schematic diagram of part of the structure of the miniature loudspeaker in Embodiment 1 of this utility model. Figure 1 ;

[0024] Figure 5 This is a schematic diagram of part of the structure of the miniature loudspeaker in Embodiment 1 of this utility model. Figure 2 .

[0025] Explanation of icon numbers:

[0026] 1. Pot stand;

[0027] 2. Magnetic circuit assembly; 21. Upper yoke; 211. Clearance slot; 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;

[0028] 3. Voice coil;

[0029] 4. Frame; 41. Inner connecting part; 42. Avoidance part; 43. Outer connecting part; 44. Reinforcing plate;

[0030] 5. Diaphragm assembly; 51. Inner fixing part; 52. Inner folding ring part; 53. Transition part; 54. Outer folding ring part; 55. Outer fixing part; 56. Inner diaphragm; 57. Outer diaphragm; 58. Connecting frame;

[0031] 6. Glue container;

[0032] 7. Centering support; 71. Internal mounting part; 72. Cantilever part; 73. External mounting part;

[0033] 8. Fixing ring frame. 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" 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.

[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] Please refer to Figures 1 to 5 One embodiment of this utility model is a miniature loudspeaker, comprising a frame 1, a magnetic circuit assembly 2, a voice coil 3, and a resonant assembly. 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 frame 1 is connected to the lower yoke 22. The central magnetic structure 23 is located between two oppositely disposed side magnetic structures 24, forming a magnetic gap between the central magnetic structure 23 and the side magnetic structures 24. The voice coil 3 is located in the magnetic gap. The upper yoke 21 covers the central magnetic structure 23 and the side magnetic structures 24. The 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, with the magnetic poles of the lower central magnet 231 and the upper central magnet 233 facing opposite directions; 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, with the magnetic poles of the lower side magnet 241 and the upper magnet 243 facing opposite directions; the upper central magnet 233 and the upper side magnet 243 are both connected to the upper yoke 21, and the lower central magnet 231 and the lower magnet 241 are both connected to the lower yoke 22;

[0042] The vibrating assembly includes a frame 4 and a ring-shaped diaphragm assembly 5. The diaphragm assembly 5 includes an inner fixing part 51, an inner folded ring part 52, a transition part 53, an outer folded ring part 54, and an outer fixing part 55 connected sequentially from the inside to the outside. The inner fixing part 51 is connected to the upper yoke 21, and the outer fixing part 55 is connected to the frame 1. The frame 4 includes an inner connecting part 41, a clearance part 42, and an outer connecting part 43 connected sequentially. The outer connecting part 43 is connected to the transition part 53. The clearance part 42 is used to avoid the inner folded ring part 52. The inner connecting part 41 is located outside the voice coil 3 and is bonded and fixed to the outer wall surface of the voice coil 3. The inner connecting part 41 is inclined relative to the outer wall surface of the voice coil 3 to form a triangular adhesive groove 6 with the outer wall surface of the voice coil 3. When the inner connecting part 41 is bonded to the voice coil 3, the adhesive groove 6 is filled with adhesive.

[0043] In one or more embodiments, the top end of the inner connecting portion 41 is set below or flush with the top surface of the voice coil 3. Optionally, the upper yoke 21 has a relief groove 211 for avoiding the voice coil 3 and the inner connecting portion 41, so that the voice coil 3 can vibrate upwards to a greater extent.

[0044] In one embodiment, the diaphragm assembly 5 includes an inner diaphragm 56, an outer diaphragm 57, and a connecting frame 58. The inner folded ring portion 52 and the inner fixing portion 51 are disposed on the inner diaphragm 56, and the outer folded ring portion 54 and the outer fixing portion 55 are disposed on the outer diaphragm 57. The connecting frame 58 connects the inner diaphragm 56 and the outer diaphragm 57 to form the transition portion 53. The connecting frame 58 can improve the rigidity of the transition portion 53, thereby better supporting the frame 4.

[0045] For ease of transportation and assembly, in this embodiment, the outer connecting part 43 of the frame 4 is generally in the shape of a ring frame, and the two opposite sides of the outer connecting part 43 are respectively connected to the clearance part 42. Specifically, the side magnetic structure 24 is set corresponding to the long axis side of the central magnetic structure 23, and the clearance part 42 is set corresponding to the end of the central magnetic structure 23.

[0046] In some embodiments, the avoidance part 42 is provided with a reinforcing plate 44, which is used to improve the structural strength of the skeleton 4. The material hardness of the reinforcing plate 44 is greater than or equal to the material hardness of the skeleton 4.

[0047] During the manufacturing process of the skeleton 4, the inner connecting part 41 can be formed by bending, which makes it easier to form the inner connecting part 41 that is inclined relative to the outer wall surface of the voice coil 3.

[0048] The miniature loudspeaker also includes a centering support 7. The frame 1 connects the outer fixing part 55 and the lower yoke 22. The centering support 7 includes an inner mounting part 71, a cantilever part 72 and an outer mounting part 73 connected in sequence. The inner mounting part 71 is connected to the voice coil 3 and the outer mounting part 73 is connected to the frame 1.

[0049] The inner mounting part 71 is provided with an inner solder pad that is electrically connected to the voice coil 3, and the outer mounting part 73 is provided with an outer solder pad that is electrically connected to the inner solder pad. The outer solder pad is used to connect to an external power supply. The external power supply supplies power to the voice coil 3 through the centering support 7. The centering support 7 can be an FPC board.

[0050] Optionally, the inner mounting portion 71 is connected to each of the four corners of the voice coil 3. In this embodiment, there are four centering supports 7, and the four centering supports 7 are arranged one-to-one with the four corners of the voice coil 3.

[0051] The miniature loudspeaker also includes a fixing ring frame 8, at least a portion of the inner fixing part 51 is sandwiched between the fixing ring frame 8 and the upper yoke 21, and the upper magnet 243 is indirectly connected to the upper yoke 21 through the fixing ring frame 8.

[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 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 an upper yoke, a lower yoke, and a central magnetic structure and a side magnetic structure respectively disposed on the lower yoke. The central magnetic structure is located between two oppositely disposed side magnetic structures, forming a magnetic gap between the central magnetic structure and the side magnetic structures. The upper yoke covers the central magnetic structure and the side magnetic structures. The central magnetic structure includes a lower central magnet, a central washer, and an upper central magnet connected sequentially from bottom to top, with the magnetic poles of the lower central magnet and the upper central magnet facing opposite directions. The side magnetic structure includes a lower side magnet, a side washer, and an upper side magnet connected sequentially from bottom to top, with the magnetic poles of the lower magnet and the upper magnet facing opposite directions. A voice coil, wherein the voice coil is located in the magnetic gap; A vibration assembly includes a frame and a ring-shaped diaphragm assembly. The diaphragm assembly includes an inner fixing part, an inner folded loop part, a transition part, an outer folded loop part, and an outer fixing part connected sequentially from the inside to the outside. The inner fixing part is connected to the upper yoke. The frame includes an inner connecting part, a clearance part, and an outer connecting part connected sequentially. The outer connecting part is connected to the transition part. The clearance part is used to avoid the inner folded loop part. The inner connecting part is located outside the voice coil and is bonded and fixed to the outer wall surface of the voice coil. The inner connecting part is inclined relative to the outer wall surface of the voice coil to form a triangular adhesive groove with the outer wall surface of the voice coil.

2. The micro speaker of claim 1, wherein: The upper yoke has a clearance groove for avoiding the voice coil and the inner connecting part.

3. The micro speaker of claim 1, wherein: The top of the inner connecting part is set below or flush with the top surface of the voice coil.

4. The micro speaker of claim 1, wherein: The diaphragm assembly includes an inner diaphragm, an outer diaphragm, and a connecting frame. The inner folded ring and the inner fixing part are disposed on the inner diaphragm, and the outer folded ring and the outer fixing part are disposed on the outer diaphragm. The connecting frame connects the inner diaphragm and the outer diaphragm to form the transition part.

5. The microspeaker of claim 1, wherein: The outer connecting part of the skeleton is in the shape of a ring frame, and the avoidance part is connected to the opposite two sides of the outer connecting part.

6. The microspeaker of claim 1, wherein: The avoidance section is equipped with a reinforcing plate.

7. The microspeaker of claim 1, wherein: It also includes a frame and a centering support. The frame connects the outer fixing part and the lower yoke. The centering support includes an inner mounting part, a cantilever 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 frame.

8. The microspeaker of claim 7, wherein: The inner mounting part is provided with an inner solder pad that is electrically connected to the voice coil, and the outer mounting part is provided with an outer solder pad that is electrically connected to the inner solder pad.

9. The microspeaker of claim 7, wherein: The four corners of the voice coil are respectively connected to the inner mounting part.

10. The microspeaker of claim 1, wherein: It also includes a fixing ring frame, at least a portion of the inner fixing part is sandwiched between the fixing ring frame and the upper yoke, and the upper magnet is indirectly connected to the upper yoke through the fixing ring frame.

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