Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a basin stand, a magnetic circuit assembly, a voice coil and a centering disk, the magnetic circuit assembly comprises a yoke, a central magnetic structure and two concave side magnetic structures, the central magnetic structure and the two concave side magnetic structures are respectively arranged on the yoke, the central magnetic structure is positioned between the two side magnetic structures, and the central magnetic structure and the two side magnetic structures are enclosed to form a runway-shaped magnetic gap; an opening part for communicating the outer sides of the edge magnetic structures and the magnetic gap is formed between the end parts of the two edge magnetic structures; the voice coil is integrally runway-shaped, and the voice coil is arranged corresponding to the magnetic gap; the centering disk comprises an inner fixing part, a cantilever part and an outer fixing part which are connected in sequence, the outer fixing part is connected with the basin stand, the cantilever part is located on the outer side of the edge magnetic structure, and the inner fixing part extends into the inlet part and is connected with the voice coil. The miniature loudspeaker is novel in structure and good in 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, the requirements for the thickness of the miniature speakers used in them are becoming increasingly stringent. The smaller the thickness of the miniature speaker, the smaller the internal space, which undoubtedly leads to a smaller overall volume of the magnet, resulting in a certain degree of performance degradation of the miniature speaker.

[0003] Moreover, in the existing technology, the centering support of conventional superlinear miniature loudspeakers is located at the four corners of the voice coil. The side magnets of miniature loudspeakers need to reserve enough space for the centering support, which results in a significant reduction in the volume of the side magnets and seriously affects the performance of the loudspeaker.

[0004] In addition, in existing technologies, voice coils are often rectangular. Due to the influence of the production stretching process, the dimensional accuracy of the four corners of the voice coil has a large deviation. Therefore, the corners of the central magnetic structure of the miniature loudspeaker need to be made to a certain extent, so that the volume of the central magnetic structure cannot be maximized. This is undoubtedly one of the factors affecting the performance of the miniature loudspeaker. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a high-performance miniature loudspeaker.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a miniature loudspeaker, comprising:

[0007] Sink stand;

[0008] A magnetic circuit assembly includes a yoke and a central magnetic structure and two U-shaped side magnetic structures respectively disposed on the yoke. The central magnetic structure is located between the two side magnetic structures and surrounds the two side magnetic structures to form a racetrack-shaped magnetic gap. An opening is formed between the ends of the two side magnetic structures to connect the outer side of the side magnetic structure with the magnetic gap.

[0009] The voice coil is generally racetrack shaped and is positioned corresponding to the magnetic gap;

[0010] The centering support includes an inner fixing part, a cantilever part, and an outer fixing part connected in sequence. The outer fixing part is connected to the frame, the cantilever part is located outside the side magnet structure, and the inner fixing part extends into the mouth and is connected to the voice coil.

[0011] In one embodiment, an avoidance notch is provided on the outer side of the corner of the edge magnetic structure, and a portion of the cantilever portion is located in the avoidance notch and forms at least one bending area.

[0012] In one embodiment, the device further includes a diaphragm assembly connecting the voice coil and the frame. The diaphragm assembly includes a diaphragm, a dome, and a frame. The diaphragm is connected to the dome and the frame, and / or the frame is connected to the diaphragm and the dome, and / or the dome is connected to the diaphragm and the frame.

[0013] In one embodiment, the skeleton includes a connected annular portion and a connecting arm, the connecting arm connecting the internal fixing portion, and the dome sealing the hollow area of ​​the annular portion.

[0014] In one embodiment, the center of the dome has a downwardly recessed platform, and the top surface of the central magnetic structure has a groove for avoiding the platform.

[0015] In one embodiment, the central magnetic structure includes a central magnet and a central washer, the central magnet connecting the yoke and the central washer, and the groove being disposed on the top surface of the central washer.

[0016] In one embodiment, the connecting arm is provided with a reinforcing rib.

[0017] In one embodiment, the side magnet structure includes a side magnet and a side washer, the side magnet connecting the side washer to the yoke, and the side washer connecting to the basin stand.

[0018] In one embodiment, the two edge washers are connected by a connecting part, and the edge washers and the connecting part are integrally formed into a single structure.

[0019] In one embodiment, a front cover for connecting the basin stand is also included.

[0020] The beneficial effects of this utility model are as follows: This miniature loudspeaker has a novel structure, and the centering support plate occupies less space on the side magnetic structure, allowing the overall volume of the side magnetic structure to be set larger, thereby improving the BL value of the miniature loudspeaker and thus improving its performance. Moreover, setting the voice coil in a racetrack shape, compared with a rectangular frame voice coil, provides greater dimensional control, which helps reduce the avoidance of the voice coil by the central magnetic structure, thereby saving internal space of the miniature loudspeaker and allowing the overall volume of the magnetic circuit assembly of the miniature loudspeaker to be set larger, achieving the goal of further improving the performance of the miniature loudspeaker. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a cross-sectional view of the miniature loudspeaker according to Embodiment 1 of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the miniature speaker after the yoke is hidden in Embodiment 1 of this utility model.

[0024] Explanation of icon numbers:

[0025] 1. Sink rack; 11. Hot melt column;

[0026] 2. Magnetic circuit assembly; 21. Yoke; 22. Central magnetic structure; 221. Groove; 23. Side magnetic structure; 231. Clearance notch; 24. Mouth;

[0027] 3. Voice coil;

[0028] 4. Centering support; 41. Internal fixation; 42. Cantilever; 421. Bending area; 43. External fixation;

[0029] 5. Diaphragm assembly; 51. Diaphragm; 52. Dome; 521. Recessed platform; 53. Frame; 531. Annular part; 532. Connecting arm; 533. Reinforcing rib;

[0030] 6. Front cover. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Example 1

[0038] Please refer to Figure 1 and Figure 2 The first embodiment of this utility model is as follows: a miniature loudspeaker, including a frame 1, a magnetic circuit assembly 2, a voice coil 3, a centering support 4, and a diaphragm assembly 5. The magnetic circuit assembly 2 includes a yoke 21 and a central magnetic structure 22 and two concave-shaped side magnetic structures 23 respectively disposed on the yoke 21. The central magnetic structure 22 is located between the two side magnetic structures 23 and forms a racetrack-shaped magnetic gap with the two side magnetic structures 23. An opening 24 is formed between the ends of the two side magnetic structures 23, connecting the outer side of the side magnetic structure 23 and the magnetic gap. It is easy to understand that the central magnetic structure 22 is waist-shaped when viewed from above.

[0039] The diaphragm assembly 5 connects the voice coil 3 and the frame 1. The voice coil 3 is generally racetrack shaped and is set in accordance with the magnetic gap.

[0040] The centering support 4 includes an inner fixing part 41, a cantilever part 42 and an outer fixing part 43 connected in sequence. The outer fixing part 43 is connected to the frame 1. The cantilever part 42 is located outside the side magnet structure 23. The inner fixing part 41 extends into the mouth 24 and is connected to the voice coil 3.

[0041] Since the voice coil 3 is racetrack-shaped, the magnetic utilization rate of the outer corner of the side magnetic structure 23 is low. In this embodiment, the outer corner of the side magnetic structure 23 is provided with a clearance notch 231. A part of the cantilever 42 is located in the clearance notch 231 and forms at least one bending area 421. The clearance notch 231 that accommodates the cantilever 42 is set in a region with low magnetic utilization rate. This can take into account both the magnetic field strength of the miniature speaker and the total length of the cantilever 42.

[0042] The diaphragm assembly 5 includes a diaphragm 51, a dome 52, and a frame 53. The diaphragm 51 is connected to the dome 52 and the frame 53, and / or the frame 53 is connected to the diaphragm 51 and the dome 52, and / or the dome 52 is connected to the diaphragm 51 and the frame 53.

[0043] In this embodiment, the frame 53 includes a connected annular portion 531 and a connecting arm 532. The connecting arm 532 connects to the inner fixing portion 41. The dome 52 seals the hollow area of ​​the annular portion 531. The annular portion 531 and the connecting arm 532 are integrally formed. The connection between the connecting arm 532 and the inner fixing portion 41 can improve the support effect of the centering support plate 4 on the diaphragm assembly 5. Optionally, the connecting arm 532 is provided with a reinforcing rib 533. The presence of the reinforcing rib 533 can improve the structural strength of the connecting arm 532 itself.

[0044] To improve the structural strength of the dome 52, the dome 52 has a downwardly recessed platform 521 at its center, and the top surface of the central magnetic structure 22 has a groove 221 for avoiding the platform 521. Specifically, the central magnetic structure 22 includes a central magnet and a central washer, the central magnet connecting the yoke 21 and the central washer, and the groove 221 is located on the top surface of the central washer.

[0045] The edge magnet structure 23 includes an edge magnet and an edge washer. The edge magnet connects the edge washer to the yoke 21, and the edge washer connects to the frame 1. For ease of manufacturing, in this embodiment, the two edge washers are connected by a connecting part. The edge washer and the connecting part are integrally formed. Specifically, the two edge washers and the two connecting parts form a ring-shaped structure, reducing the number of components in the miniature speaker and facilitating its assembly. Preferably, the edge washer and the frame 1 are integrally injection molded. The edge magnet is a single concave magnet, or it can be a concave magnet composed of multiple small magnets.

[0046] Optionally, the miniature speaker also includes a front cover 6 connected to the frame 1. In this embodiment, the outer edge of the diaphragm 51 is sandwiched between the front cover 6 and the frame 1. More specifically, the frame 1 is provided with a hot-melt column 11, and the frame 1 and the front cover 6 are hot-melt connected.

[0047] 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 Sink stand; A magnetic circuit assembly includes a yoke and a central magnetic structure and two U-shaped side magnetic structures respectively disposed on the yoke. The central magnetic structure is located between the two side magnetic structures and surrounds the two side magnetic structures to form a racetrack-shaped magnetic gap. An opening is formed between the ends of the two side magnetic structures to connect the outer side of the side magnetic structure with the magnetic gap. The voice coil is generally racetrack shaped and is positioned corresponding to the magnetic gap; The centering support includes an inner fixing part, a cantilever part, and an outer fixing part connected in sequence. The outer fixing part is connected to the frame, the cantilever part is located outside the side magnet structure, and the inner fixing part extends into the mouth and is connected to the voice coil.

2. The miniature loudspeaker according to claim 1, characterized in that: The outer side of the corner of the edge magnetic structure is provided with a clearance notch, and a part of the cantilever portion is located in the clearance notch and forms at least one bending area.

3. The miniature loudspeaker according to claim 1, characterized in that: It also includes a diaphragm assembly, which connects the voice coil and the frame. The diaphragm assembly includes a diaphragm, a dome, and a frame. The diaphragm is connected to the dome and the frame, and / or the frame is connected to the diaphragm and the dome, and / or the dome is connected to the diaphragm and the frame.

4. The miniature loudspeaker according to claim 3, characterized in that: The skeleton includes a connected annular portion and a connecting arm, the connecting arm connecting the internal fixing portion, and the dome sealing the hollow area of ​​the annular portion.

5. The miniature loudspeaker according to claim 4, characterized in that: The dome has a downward-facing recessed platform at its center, and the top surface of the central magnetic structure has a groove for avoiding the recessed platform.

6. The miniature loudspeaker according to claim 5, characterized in that: The central magnetic structure includes a central magnet and a central washer. The central magnet connects the yoke and the central washer, and the groove is provided on the top surface of the central washer.

7. The miniature loudspeaker according to claim 4, characterized in that: The connecting arm is provided with reinforcing ribs.

8. The miniature loudspeaker according to claim 1, characterized in that: The side magnetic structure includes a side magnet and a side washer, the side magnet connecting the side washer to the yoke, and the side washer connecting to the basin stand.

9. The miniature loudspeaker according to claim 8, characterized in that: The two edge washers are connected by a connecting part, and the edge washers and the connecting part are integrally formed into a single structure.

10. The miniature loudspeaker according to claim 1, characterized in that: It also includes a front cover that connects to the basin stand.

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