Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a frame, a magnetic circuit assembly, a diaphragm assembly, an inner voice coil and an outer voice coil, the magnetic circuit assembly comprises a yoke, a central magnetic structure, an annular magnetic structure and an edge magnetic structure, the central magnetic structure, the annular magnetic structure and the edge magnetic structure are sequentially arranged on the yoke from inside to outside, and an inner ring magnetic gap is formed between the central magnetic structure and the annular magnetic structure. An outer ring magnetic gap is formed between the annular magnetic structure and the side magnetic structure, the central magnetic structure comprises lower central magnetic steel, a central washer and upper central magnetic steel which are sequentially stacked and connected from bottom to top, and the magnetic pole polarity of the lower central magnetic steel is opposite to that of the upper central magnetic steel; the vibrating diaphragm assembly comprises an inner voice diaphragm, an annular framework and an outer voice diaphragm which are sequentially connected from inside to outside, the inner voice diaphragm is connected with the upper central magnetic steel, and the outer voice diaphragm is connected with the basin stand; the inner voice coil is connected with the annular framework and is arranged corresponding to the inner ring magnetic gap; the outer voice coil is connected with the annular skeleton and is arranged corresponding to the outer ring magnetic gap. The miniature loudspeaker is large in BL value and excellent in acoustic performance.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic transducers, and particularly relates to a micro speaker. Background Art

[0002] With the rapid development of portable electronic devices such as mobile phones, laptops, hearing aids, etc., people's requirements for the micro electroacoustic devices applied therein are getting higher and higher. With the development of society, the thickness of the micro speaker is getting smaller and smaller, and its corresponding performance has a certain degree of attenuation, affecting the consumer experience. Content of the Utility Model

[0003] The technical problem solved by the utility model is to provide a high-performance micro speaker.

[0004] In order to solve the above technical problem, the technical solution adopted by the utility model is: a micro speaker, comprising:

[0005] A chassis;

[0006] A magnetic circuit assembly, the magnetic circuit assembly includes a yoke and a central magnetic structure, a ring-shaped magnetic structure and a side magnetic structure sequentially arranged on the yoke from inside to outside. An inner ring magnetic gap is formed between the central magnetic structure and the ring-shaped magnetic structure, and an outer ring magnetic gap is formed between the ring-shaped magnetic structure and the side magnetic structure. The central magnetic structure includes a lower central magnet, a central washer and an upper central magnet stacked and connected in sequence from bottom to top. The magnetic pole polarity of the lower central magnet is opposite to that of the upper central magnet;

[0007] A diaphragm assembly, the diaphragm assembly includes an inner sound film, an annular skeleton and an outer sound film connected in sequence from inside to outside. The inner sound film is connected to the upper central magnet, and the outer sound film is connected to the chassis;

[0008] An inner voice coil, the inner voice coil is connected to the annular skeleton and is arranged corresponding to the inner ring magnetic gap;

[0009] An outer voice coil, the outer voice coil is connected to the annular skeleton and is arranged corresponding to the outer ring magnetic gap.

[0010] In one embodiment, the cross section of the upper central magnet is convex-shaped. The upper central magnet includes an upper magnet and a lower magnet stacked and connected up and down. The lower magnet is located below the upper magnet and is connected to the central washer.

[0011] In one embodiment, the inner sound film includes an inner fixing part, an inner folding part and an outer fixing part connected in sequence from inside to outside. The inner fixing part is in a cap shape, and the inner fixing part is respectively connected and fixed to the top surface of the lower magnet, the peripheral wall of the upper magnet and the top surface of the upper magnet.

[0012] In one embodiment, the annular framework includes a first ring frame, a second ring frame, and a third ring frame that are connected in sequence from inside to outside. The top surface of the first ring frame is lower than the top surface of the second ring frame, the top surface of the second ring frame is lower than the top surface of the third ring frame, the top surface of the third ring frame is connected to the outer sound film, the bottom surface of the third ring frame is connected to the outer voice coil, the top surface of the first ring frame is connected to the outer fixing portion, the inner edge of the top surface of the second ring frame is connected to the outer fixing portion, the transition region between the first ring frame and the second ring frame is connected to the outer fixing portion, and the bottom surface of the first ring frame is connected to the inner voice coil.

[0013] In one embodiment, the annular framework is an integrally formed one-piece structure, and the annular framework and the inner sound film are an integrally formed structure by insert injection molding.

[0014] In one embodiment, the upper magnetic steel and the lower magnetic steel are an integrally formed one-piece structure; alternatively, the upper magnetic steel and the lower magnetic steel are adhesively connected.

[0015] In one embodiment, an avoidance inclined surface is provided at the top edge of the lower magnetic steel.

[0016] In one embodiment, the annular magnetic structure includes an annular magnetic steel and an annular washer provided on the top surface of the annular magnetic steel.

[0017] In one embodiment, a plurality of dividing grooves are provided on the annular magnetic steel, and the dividing grooves divide the annular magnetic steel into multiple pieces.

[0018] In one embodiment, the edge magnetic structure includes an edge magnetic steel and an edge washer provided on the top surface of the edge magnetic steel, and the edge washer is connected to the speaker frame.

[0019] The beneficial effects of the present utility model are as follows: The structure of this micro speaker is novel. The setting of the upper center magnetic steel with a magnetic pole polarity opposite to that of the lower center magnetic steel effectively enhances the BL value of the micro speaker. The design of the inner and outer double voice coils also enhances the BL value of the micro speaker, thereby improving the overall performance of the micro speaker and making the micro speaker have better acoustic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1Schematic structural diagram of the micro speaker according to the first embodiment of the present utility model;

[0022] Figure 2 Cross-sectional view of the micro speaker according to the first embodiment of the present utility model;

[0023] Figure 3 Schematic structural diagram of the magnetic circuit assembly in the micro speaker according to the first embodiment of the present utility model.

[0024] Explanation of the reference numerals in the drawings:

[0025] 1. Basin frame;

[0026] 2. Magnetic circuit assembly; 21. Yoke; 22. Central magnetic structure; 221. Lower central magnet; 222. Central washer; 223. Upper central magnet; 2231. Upper magnet; 2232. Lower magnet; 2233. Avoidance inclined plane; 23. Ring-shaped magnetic structure; 24. Edge magnetic structure;

[0027] 3. Diaphragm assembly; 31. Inner sound film; 311. Inner fixing part; 312. Inner folding ring part; 313. Outer fixing part; 32. Ring-shaped skeleton; 321. First ring frame; 322. Second ring frame; 323. Third ring frame; 33. Outer sound film;

[0028] 4. Inner voice coil;

[0029] 5. Outer voice coil. Detailed implementation manners

[0030] The realization of the object, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings.

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] It should be noted that if there are directional indications such as up, down, left, right, front, back... in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture as shown in the drawings. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0034] In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "and / or" as an example, it includes the solution of A, or the solution of B, or the solution of both A and B being satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions 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 required by the present utility model.

[0035] In this application, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connection", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Embodiment 1

[0037] Please refer to Figures 1 to 3, Embodiment 1 of the present utility model is: a micro speaker, including a chassis 1, a magnetic circuit assembly 2, a diaphragm assembly 3, an inner voice coil 4 and an outer voice coil 5. The magnetic circuit assembly 2 includes a yoke 21 and a central magnetic structure 22, a ring magnetic structure 23 and an edge magnetic structure 24 sequentially arranged on the yoke 21 from inside to outside. An inner ring magnetic gap is formed between the central magnetic structure 22 and the ring magnetic structure 23, and an outer ring magnetic gap is formed between the ring magnetic structure 23 and the edge magnetic structure 24. The central magnetic structure 22 includes a lower central magnet 221, a central washer 222 and an upper central magnet 223 stacked and connected in sequence from bottom to top. The bottom surface of the lower central magnet 221 is connected to the yoke 21, and the magnetic pole polarity of the lower central magnet 221 is opposite to that of the upper central magnet 223. That is to say, when the bottom of the lower central magnet 221 is the S pole, the bottom of the upper central magnet 223 is the N pole; when the bottom of the lower central magnet 221 is the N pole, the bottom of the upper central magnet 223 is the S pole. The diaphragm assembly 3 includes an inner diaphragm 31, an annular skeleton 32 and an outer diaphragm 33 connected in sequence from inside to outside. The inner diaphragm 31 is connected to the upper central magnet 223, and the outer diaphragm 33 is connected to the chassis 1. The inner voice coil 4 is connected to the annular skeleton 32 and is arranged corresponding to the inner ring magnetic gap. The outer voice coil 5 is connected to the annular skeleton 32 and is arranged corresponding to the outer ring magnetic gap.

[0038] The inner diaphragm 31 includes an inner fixing part 311, an inner folding part 312 and an outer fixing part 313 connected in sequence from inside to outside. In this embodiment, the inner folding part 312 protrudes away from the yoke 21. To make full use of the occupied space of the micro speaker, it is preferred that the cross section of the upper central magnet 223 is convex. Specifically, the upper central magnet 223 includes an upper magnet 2231 and a lower magnet 2232 stacked and connected up and down. The lower magnet 2232 is located below the upper magnet 2231 and is connected to the central washer 222.

[0039] To improve the connection stability between the inner diaphragm 31 and the central magnetic structure 22, optionally, the inner fixing part 311 is in a cap shape, and the inner fixing part 311 is respectively connected and fixed to the top surface of the lower magnet 2232, the peripheral wall of the upper magnet 2231 and the top surface of the upper magnet 2231. The specific connection method can be adhesive connection. In other words, the inner fixing part 311 covers the upper central magnet 223. It should be noted that in actual products, the inner fixing part 311 is in a ring shape, and it is also possible that the inner fixing part 311 is only fixedly connected to the peripheral wall of the upper magnet 2231 and / or the top surface of the lower magnet 2232.

[0040] The upper magnet 2231 and the lower magnet 2232 are integrally formed as an integral structure; alternatively, the upper magnet 2231 and the lower magnet 2232 are adhesively connected.

[0041] To prevent the inner sound film 31 from interfering with the lower magnet 2232 during vibration, it is preferred that the top edge of the lower magnet 2232 is provided with an avoidance inclined surface 2233, which can maximize the total volume of the upper magnet 2231, thereby increasing the BL value of the micro speaker to a greater extent.

[0042] In this embodiment, the annular skeleton 32 includes a first ring frame 321, a second ring frame 322, and a third ring frame 323 that are sequentially connected from the inside out. The top surface of the first ring frame 321 is lower than the top surface of the second ring frame 322, the top surface of the second ring frame 322 is lower than the top surface of the third ring frame 323, the bottom surface of the third ring frame 323 is higher than the bottom surface of the second ring frame 322, the bottom surface of the second ring frame 322 is higher than the bottom surface of the first ring frame 321. The top surface of the third ring frame 323 is connected to the outer sound film 33, the bottom surface of the third ring frame 323 is connected to the outer voice coil 5, the bottom surface of the first ring frame 321 is connected to the inner voice coil 4, the top surface of the first ring frame 321 is connected to the outer fixing part 313, the inner edge of the top surface of the second ring frame 322 is connected to the outer fixing part 313, and the transition area between the first ring frame 321 and the second ring frame 322 is connected to the outer fixing part 313. Such an annular skeleton 32 can effectively increase the bonding area with the inner sound film 31, thereby improving the overall structural stability of the diaphragm assembly 3. At the same time, the inner voice coil 4 can be made to penetrate deeper into the inner ring magnetic gap to further improve the performance of the micro speaker.

[0043] For the convenience of processing and manufacturing the diaphragm assembly 3, the annular skeleton 32 is integrally formed as an integral structure, and the annular skeleton 32 and the inner sound film 31 are integrally formed by insert injection molding.

[0044] The annular magnetic structure 23 includes an annular magnet and an annular washer provided on the top surface of the annular magnet. In some embodiments, the annular magnet may be a continuous and complete ring frame structure, and in a specific product, multiple dividing grooves may also be provided on the annular magnet, and it is also possible to divide the annular magnet into multiple pieces, that is to say, the annular magnet may be formed by enclosing multiple small magnets.

[0045] The edge magnetic structure 24 includes an edge magnet and an edge washer provided on the top surface of the edge magnet. The edge washer is connected to the chassis 1, and the edge magnetic structures 24 are respectively provided corresponding to the four peripheries of the annular magnetic structure 23.

[0046] The above are only optional embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present utility model.

Claims

1. A micro speaker, characterized in that: including a chassis; a magnetic circuit assembly, the magnetic circuit assembly including a yoke and a central magnetic structure, an annular magnetic structure and an edge magnetic structure which are sequentially arranged on the yoke from inside to outside, an inner ring magnetic gap being formed between the central magnetic structure and the annular magnetic structure, an outer ring magnetic gap being formed between the annular magnetic structure and the edge magnetic structure, the central magnetic structure including a lower central magnet, a central washer and an upper central magnet which are sequentially stacked and connected from bottom to top, the magnetic pole polarity of the lower central magnet being opposite to that of the upper central magnet; a diaphragm assembly, the diaphragm assembly including an inner sound film, an annular skeleton and an outer sound film which are sequentially connected from inside to outside, the inner sound film being connected to the upper central magnet, and the outer sound film being connected to the chassis; an inner voice coil, the inner voice coil being connected to the annular skeleton and arranged corresponding to the inner ring magnetic gap; an outer voice coil, the outer voice coil being connected to the annular skeleton and arranged corresponding to the outer ring magnetic gap.

2. The micro speaker according to claim 1, wherein: The cross section of the upper central magnet is convex-shaped, the upper central magnet including an upper magnet and a lower magnet which are stacked and connected up and down, the lower magnet being located below the upper magnet and connected to the central washer.

3. The micro speaker according to claim 2, wherein: The inner sound film includes an inner fixing part, an inner folding part and an outer fixing part which are sequentially connected from inside to outside, the inner fixing part being cap-shaped, and the inner fixing part being respectively connected and fixed to the top surface of the lower magnet, the peripheral wall of the upper magnet and the top surface of the upper magnet.

4. The micro speaker according to claim 3, characterized in that: The annular skeleton includes a first ring frame, a second ring frame and a third ring frame which are sequentially connected from inside to outside, the top surface of the first ring frame being lower than that of the second ring frame, the top surface of the second ring frame being lower than that of the third ring frame, the top surface of the third ring frame being connected to the outer sound film, the bottom surface of the third ring frame being connected to the outer voice coil, the top surface of the first ring frame being connected to the outer fixing part, the inner edge of the top surface of the second ring frame being connected to the outer fixing part, the transition area between the first ring frame and the second ring frame being connected to the outer fixing part, and the bottom surface of the first ring frame being connected to the inner voice coil.

5. The micro speaker according to claim 4, characterized in that: The annular skeleton is an integrally formed one-piece structure, and the annular skeleton and the inner sound film are an integrally formed one-piece structure by insert injection molding.

6. The micro-speaker according to claim 2, wherein: The upper magnet and the lower magnet are an integrally formed one-piece structure; or, the upper magnet and the lower magnet are adhesively connected.

7. The micro speaker according to claim 2, wherein: A relief slope is provided at the top edge of the lower magnet.

8. The micro speaker according to claim 1, characterized in that: The annular magnetic structure includes an annular magnet and an annular washer arranged on the top surface of the annular magnet.

9. The micro speaker according to claim 8, wherein: A plurality of dividing grooves are provided on the annular magnet, and the dividing grooves divide the annular magnet into multiple pieces.

10. The micro speaker according to claim 1, wherein: The edge magnetic structure includes an edge magnet and an edge washer arranged on the top surface of the edge magnet, and the edge washer is connected to the chassis.

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