Miniature loudspeaker

Abstract

The miniature loudspeaker comprises a basin stand, a magnetic circuit assembly, a vibrating diaphragm assembly, an outer voice coil and a plurality of vertical voice coils, the magnetic circuit assembly comprises a yoke, a central magnetic structure, an annular magnetic structure and a side magnetic structure, the central area of the yoke is provided with a hollow convex hull protruding downwards, the central magnetic structure is arranged on the inner bottom surface of the hollow convex hull, and the annular magnetic structure is arranged on the inner bottom surface of the hollow convex hull. The annular magnetic structure surrounds the hollow convex hull and is arranged on the top surface of the yoke, the side magnetic structure is arranged on the outer side of the annular magnetic structure, an inner ring magnetic gap is formed between the central magnetic structure and the annular magnetic structure, and an outer ring magnetic gap is formed between the annular magnetic structure and the side magnetic structure; the central magnetic structure comprises a lower central magnetic steel, a lower central washer, a middle central magnetic steel, an upper central washer and an upper central magnetic steel which are sequentially stacked and connected from bottom to top, the magnetic pole polarity of the lower central magnetic steel is the same as that of the upper central magnetic steel, and the magnetic pole polarity of the lower central magnetic steel is opposite to that of the middle central magnetic steel. The miniature loudspeaker is excellent in performance and good in acoustic performance.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic converters, in particular to a miniature loudspeaker. Background Art

[0002] With the rapid development of portable electronic devices such as mobile phones, laptops, and hearing aids, people have higher and higher requirements for the micro-electroacoustic devices used in them. With the development of society, the thickness of micro-speakers is getting smaller and smaller, and their corresponding performance has been attenuated to a certain extent, affecting consumer experience. Utility Model Content

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

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a micro speaker, comprising:

[0005] basin rack;

[0006] A magnetic circuit assembly, the magnetic circuit assembly comprising a yoke, a central magnetic structure, an annular magnetic structure and an edge magnetic structure, the central area of the yoke having a hollow bulge protruding downward, the central magnetic structure being arranged on the inner bottom surface of the hollow bulge, the annular magnetic structure being arranged on the top surface of the yoke around the hollow bulge, the edge magnetic structure being arranged on the outside of the annular magnetic structure and connected to the basin, an inner magnetic gap being formed between the central magnetic structure and the annular magnetic structure, an outer magnetic gap being formed between the annular magnetic structure and the edge magnetic structure, the central magnetic structure comprising a lower central magnetic steel, a lower central washer, a middle central magnetic steel, an upper central washer and an upper central magnetic steel stacked and connected in sequence from bottom to top, the magnetic pole polarity of the lower central magnetic steel being the same as the magnetic pole polarity of the upper central magnetic steel, and the magnetic pole polarity of the lower central magnetic steel being opposite to the magnetic pole polarity of the middle central magnetic steel;

[0007] A diaphragm assembly, the diaphragm assembly comprising an inner diaphragm, an annular frame, and an outer diaphragm connected in sequence from the inside out, the inner diaphragm being connected to the upper center magnetic steel, and the outer diaphragm being connected to the basin frame;

[0008] a plurality of vertical voice coils connected to the annular frame and arranged corresponding to the inner coil magnetic gap, wherein the central magnetic structure is located between at least one group of two oppositely arranged vertical voice coils;

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

[0010] In one embodiment, the number of the vertical voice coils is four, and the four sides of the central magnetic structure are correspondingly provided with the vertical voice coils.

[0011] In one embodiment, the hollow bulge and the yoke are an integral structure formed by integral processing; or, the yoke has a window, and the hollow bulge is fixedly connected to the yoke and closes the window.

[0012] In one embodiment, the cross-section of the upper center magnetic steel is convex-shaped, and the upper center magnetic steel includes an upper magnetic steel and a lower magnetic steel stacked and connected up and down, and the lower magnetic steel is located below the upper magnetic steel and connected to the upper center washer.

[0013] In one embodiment, the inner sound membrane includes an inner fixed portion, an inner folding ring portion and an outer fixed portion which are connected in sequence from the inside to the outside, and the inner fixed portion is in the shape of a cap, and the inner fixed portion is fixedly connected to the top surface of the lower magnetic steel, the peripheral wall of the upper magnetic steel and the top surface of the upper magnetic steel respectively.

[0014] In one embodiment, the annular skeleton includes a first ring frame, a second ring frame and a third ring frame connected in sequence from the inside to the outside, the top surface of the first ring frame is set lower than the top surface of the second ring frame, the top surface of the second ring frame is set lower than the top surface of the third ring frame, the top surface of the third ring frame is connected to the outer sound membrane, 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 part, the inner edge of the top surface of the second ring frame is connected to the outer fixing part, the transition area between the first ring frame and the second ring frame is connected to the outer fixing part, and the bottom surface of the first ring frame is connected to the vertical voice coil.

[0015] In one embodiment, the annular skeleton is an integral structure formed by integral processing, and the annular skeleton and the inner sound membrane are an integral structure formed by insert injection molding.

[0016] In one embodiment, the upper magnetic steel and the lower magnetic steel are an integrally formed structure; or, the upper magnetic steel and the lower magnetic steel are adhesively connected.

[0017] In one embodiment, a top edge of the lower magnetic steel is provided with an avoidance slope.

[0018] In one embodiment, the annular magnetic structure includes an annular magnetic steel and an annular washer disposed on a top surface of the annular magnetic steel.

[0019] The beneficial effects of the present invention are as follows: the micro-speaker has a novel structure, and the anti-magnetic design in the central magnetic structure and the addition of the vertical voice coil greatly improve 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 embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of a micro-speaker according to the first embodiment of the present invention;

[0022] Figure 2 is a cross-sectional view of the micro-speaker according to the first embodiment of the present invention;

[0023] Figure 3 This is a schematic structural diagram of a portion of the micro-speaker according to the first embodiment of the present invention.

[0024] Description of Figure Numbers:

[0025] 1. Basin rack;

[0026] 2. Magnetic circuit assembly; 21. Yoke; 22. Center magnetic structure; 221. Lower center magnet; 222. Lower center washer; 223. Middle center magnet; 224. Upper center washer; 225. Upper center magnet; 2251. Upper magnet; 2252. Lower magnet; 2253. Avoidance ramp; 23. Ring magnetic structure; 24. Edge magnetic structure; 25. Hollow convex hull;

[0027] 3. Diaphragm assembly; 31. Inner diaphragm; 311. Inner fixing portion; 312. Inner folding ring portion; 313. Outer fixing portion; 32. Ring frame; 321. First ring frame; 322. Second ring frame; 323. Third ring frame; 33. Outer diaphragm;

[0028] 4. Vertical voice coil;

[0029] 5. External voice coil. DETAILED DESCRIPTION

[0030] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if the embodiments of the present invention include descriptions of "first," "second," etc., 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 the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0034] In addition, if the word "and / or" appears throughout the text, it means that three parallel solutions are included. For example, "and / or" includes solutions, or solutions, or solutions that meet all of the requirements simultaneously. In addition, the technical solutions of various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. If the combination of technical solutions is mutually contradictory or cannot be implemented, it shall be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0035] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0036] Example 1

[0037] Please refer to Figures 1 to 3The first embodiment of the present invention is: a micro speaker, including a basin frame 1, a magnetic circuit assembly 2, a diaphragm assembly 3, an outer voice coil 5 and multiple vertical voice coils 4, the magnetic circuit assembly 2 includes a yoke 21, a central magnetic structure 22, an annular magnetic structure 23 and an edge magnetic structure 24, the central area of the yoke 21 has a hollow convex hull 25 protruding downward, the central magnetic structure 22 is arranged on the inner bottom surface of the hollow convex hull 25, and the annular magnetic structure 23 is arranged on the top surface of the yoke 21 around the hollow convex hull 25. The side magnetic structure 24 is arranged on the outside of the annular magnetic structure 23 and connected to the basin frame 1. An inner magnetic gap is formed between the central magnetic structure 22 and the annular magnetic structure 23, and an outer magnetic gap is formed between the annular magnetic structure 23 and the side magnetic structure 24. The central magnetic structure 22 includes a lower central magnetic steel 221, a lower central washer 222, a middle central magnetic steel 223, an upper central washer 224 and an upper central magnetic steel 225 stacked and connected in sequence from bottom to top. The lower central magnetic steel 2 The magnetic pole polarity of the lower center magnetic steel 221 is the same as that of the upper center magnetic steel 225, and the magnetic pole polarity of the lower center magnetic steel 221 is opposite to that of the middle center magnetic steel 223. That is, when the bottom of the lower center magnetic steel 221 is the S pole, the bottom of the middle center magnetic steel 223 is the N pole, and the bottom of the upper center magnetic steel 225 is the S pole. When the bottom of the lower center magnetic steel 221 is the N pole, the bottom of the middle center magnetic steel 223 is the S pole, and the bottom of the upper center magnetic steel 225 is the N pole. It is the N pole; the diaphragm assembly 3 includes an inner sound diaphragm 31, an annular skeleton 32 and an outer sound diaphragm 33 which are connected in sequence from the inside to the outside, the inner sound diaphragm 31 is connected to the upper center magnetic steel 225, and the outer sound diaphragm 33 is connected to the basin frame 1; the vertical voice coil 4 is connected to the annular skeleton 32 and is set corresponding to the inner ring magnetic gap, and the central magnetic structure 22 is located between at least one group of two oppositely arranged vertical voice coils 4; the outer voice coil 5 is connected to the annular skeleton 32 and is set corresponding to the outer ring magnetic gap.

[0038] It should be noted that the lower portion of the inner ring magnetic gap extends to between the central magnetic structure 22 and the inner wall surface of the hollow convex hull 25 .

[0039] In order to further improve the BL value of the micro speaker, in this embodiment, the number of the vertical voice coils 4 is four, and the four sides of the central magnetic structure 22 are respectively provided with the vertical voice coils 4 .

[0040] In some embodiments, the hollow bulge 25 and the yoke 21 are an integral structure formed by integral processing; in this embodiment, the yoke 21 has a window, and the hollow bulge 25 is fixedly connected to the yoke 21 and closes the window.

[0041] Specifically, the annular magnetic structure 23 includes an annular magnetic steel and an annular washer disposed on the top surface of the annular magnetic steel. In some embodiments, the annular magnetic steel can be a continuous and complete ring frame structure. In specific products, the annular magnetic steel can also be provided with multiple dividing grooves, which divide the annular magnetic steel into multiple pieces. In other words, the annular magnetic steel can be formed by enclosing multiple small magnetic steel pieces. The side magnetic structure 24 includes side magnetic steel and a side washer disposed on the top surface of the side magnetic steel. The side washer is connected to the basin frame 1. The side magnetic structures 24 are respectively provided on the four sides of the annular magnetic structure 23.

[0042] More specifically, the side washers, the annular washers and the upper center washer 224 are roughly aligned, the yoke 21 is roughly aligned with the lower center washer 222, the height of the upper side of the vertical voice coil 4 is roughly equal to the height of the upper center washer 224, and the height of the lower side of the vertical voice coil 4 is roughly equal to the height of the lower center washer 222, so that the vertical voice coil 4 can better cut the magnetic lines of force.

[0043] The inner sound membrane 31 includes an inner fixed portion 311, an inner folding ring portion 312 and an outer fixed portion 313 which are connected in sequence from the inside to the outside. In this embodiment, the inner folding ring portion 312 protrudes in the direction away from the yoke 21. In order to make full use of the occupied space of the micro speaker, the cross-section of the upper center magnet 225 is preferably convex. Specifically, the upper center magnet 225 includes an upper magnet 2251 and a lower magnet 2252 which are stacked and connected in an upper and lower manner. The lower magnet 2252 is located below the upper magnet 2251 and is connected to the upper center washer 224.

[0044] In order to improve the stability of the connection between the inner sound membrane 31 and the central magnetic structure 22, the inner fixing portion 311 is optionally in the shape of a cap, and the inner fixing portion 311 is respectively fixedly connected to the top surface of the lower magnetic steel 2252, the peripheral wall of the upper magnetic steel 2251, and the top surface of the upper magnetic steel 2251. The specific connection method can be an adhesive connection. In other words, the inner fixing portion 311 is covered on the upper central magnetic steel 225. It should be noted that in actual products, the inner fixing portion 311 is annular, and it is also possible that the inner fixing portion 311 is only fixedly connected to the peripheral wall of the upper magnetic steel 2251 and / or the top surface of the lower magnetic steel 2252.

[0045] The upper magnetic steel 2251 and the lower magnetic steel 2252 are an integral structure formed by integral processing; or, the upper magnetic steel 2251 and the lower magnetic steel 2252 are adhesively connected.

[0046] In order to avoid interference between the inner sound membrane 31 and the lower magnetic steel 2252 during vibration, the top edge of the lower magnetic steel 2252 is preferably provided with an avoidance slope 2253, so that the total volume of the upper magnetic steel 2251 can be maximized, thereby further improving the BL value of the micro speaker.

[0047] In this embodiment, the annular skeleton 32 includes a first ring frame 321, a second ring frame 322 and a third ring frame 323 connected in sequence from the inside to the outside, 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 membrane 33, and the bottom surface of the third ring frame 323 is connected to the outer sound membrane 33. The outer voice coil 5 is connected, the bottom surface of the first ring frame 321 is connected to the vertical 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 membrane 31, thereby improving the overall structural stability of the diaphragm assembly 3. At the same time, it can allow the vertical voice coil 4 to penetrate deeper into the inner ring magnetic gap to further improve the performance of the micro speaker.

[0048] In order to facilitate the processing and manufacturing of the diaphragm assembly 3, the annular skeleton 32 is an integral structure formed by integral processing, and the annular skeleton 32 and the inner sound membrane 31 are an integral structure formed by insert injection molding.

[0049] The above are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the practical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A micro speaker, characterized in that: include basin rack; A magnetic circuit assembly, the magnetic circuit assembly comprising a yoke, a central magnetic structure, an annular magnetic structure and an edge magnetic structure, the central area of the yoke having a hollow bulge protruding downward, the central magnetic structure being arranged on the inner bottom surface of the hollow bulge, the annular magnetic structure being arranged on the top surface of the yoke around the hollow bulge, the edge magnetic structure being arranged on the outside of the annular magnetic structure and connected to the basin, an inner magnetic gap being formed between the central magnetic structure and the annular magnetic structure, an outer magnetic gap being formed between the annular magnetic structure and the edge magnetic structure, the central magnetic structure comprising a lower central magnetic steel, a lower central washer, a middle central magnetic steel, an upper central washer and an upper central magnetic steel stacked and connected in sequence from bottom to top, the magnetic pole polarity of the lower central magnetic steel being the same as the magnetic pole polarity of the upper central magnetic steel, and the magnetic pole polarity of the lower central magnetic steel being opposite to the magnetic pole polarity of the middle central magnetic steel; A diaphragm assembly, the diaphragm assembly comprising an inner diaphragm, an annular frame, and an outer diaphragm connected in sequence from the inside out, the inner diaphragm being connected to the upper center magnetic steel, and the outer diaphragm being connected to the basin frame; a plurality of vertical voice coils connected to the annular frame and arranged corresponding to the inner coil magnetic gap, wherein the central magnetic structure is located between at least one group of two oppositely arranged vertical voice coils; An outer voice coil is connected to the annular frame and is arranged corresponding to the outer coil magnetic gap.

2. The micro-speaker according to claim 1, wherein: There are four vertical voice coils, and the four sides of the central magnetic structure are respectively provided with the vertical voice coils.

3. The micro-speaker according to claim 1, wherein: The hollow bulge and the yoke are an integral structure formed by integral processing; or, the yoke has a window, and the hollow bulge is fixedly connected to the yoke and closes the window.

4. The micro-speaker according to claim 1, wherein: The cross section of the upper center magnetic steel is convex-shaped. The upper center magnetic steel includes an upper magnetic steel and a lower magnetic steel stacked and connected up and down. The lower magnetic steel is located below the upper magnetic steel and connected to the upper center washer.

5. The micro-speaker according to claim 4, wherein: The inner sound membrane includes an inner fixed part, an inner folding ring part and an outer fixed part which are connected in sequence from the inside to the outside. The inner fixed part is in the shape of a cap and is fixedly connected to the top surface of the lower magnetic steel, the peripheral wall of the upper magnetic steel and the top surface of the upper magnetic steel respectively.

6. The micro-speaker according to claim 5, wherein: The annular skeleton includes a first ring frame, a second ring frame and a third ring frame connected in sequence from the inside to the outside. The top surface of the first ring frame is set lower than the top surface of the second ring frame, the top surface of the second ring frame is set lower than the top surface of the third ring frame, the top surface of the third ring frame is connected to the outer sound membrane, 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 part, the inner edge of the top surface of the second ring frame is connected to the outer fixing part, the transition area between the first ring frame and the second ring frame is connected to the outer fixing part, and the bottom surface of the first ring frame is connected to the vertical voice coil.

7. The micro-speaker according to claim 6, wherein: The annular skeleton is an integral structure formed by integral processing, and the annular skeleton and the inner sound membrane are an integral structure formed by insert injection molding.

8. The micro-speaker according to claim 4, wherein: The upper magnetic steel and the lower magnetic steel are an integrally formed one-piece structure; or, the upper magnetic steel and the lower magnetic steel are adhesively connected.

9. The micro-speaker according to claim 4, wherein: The top edge of the lower magnetic steel is provided with an avoidance slope.

10. The micro-speaker according to claim 1, wherein: The annular magnetic structure includes an annular magnetic steel and an annular washer arranged on the top surface of the annular magnetic steel.

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