Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a diaphragm assembly and a magnetic circuit assembly, and the diaphragm assembly is provided with an inner fixing part, a first folding ring part and an outer fixing part which are sequentially connected from inside to outside; the magnetic circuit assembly comprises additional magnetic steel, a yoke and an edge magnetic structure arranged on the yoke, the edge magnetic structure comprises edge magnetic steel and an annular washer, the annular washer comprises a flat plate part and a vertical plate part which are connected, the vertical plate part is connected with the outer fixing part, and the edge magnetic steel is connected with the bottom surface of the flat plate part and the yoke; the first folding ring part protrudes in the direction away from the flat plate part, the additional magnetic steel is arranged on the top face of the flat plate part and corresponds to the first folding ring part, and the top of the additional magnetic steel and the bottom of the side magnetic steel are the same in magnetic pole polarity. The miniature loudspeaker is novel in structure, the top surface of the annular washer is provided with the additional magnetic steel opposite to the magnetic pole polarity of the side magnetic steel, the magnetic flux of the magnetic circuit assembly is enhanced, the BL value of the miniature loudspeaker is improved, the performance of the miniature loudspeaker is enhanced, and the use experience of consumers can be effectively improved.

Description

Technical Field

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

[0002] Nowadays, mobile terminals such as mobile phones and tablets enrich people's lives, and micro speakers play an indispensable role as audio devices.

[0003] With the development of society, electronic devices are becoming thinner and lighter, which requires the micro speakers they carry to become thinner and thinner. As the thickness becomes thinner, the performance of the micro speakers also becomes lower and lower, seriously affecting the consumer experience. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a high-performance micro speaker.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a miniature speaker, comprising:

[0006] A diaphragm assembly, wherein the diaphragm assembly comprises an inner fixing portion, a first folding ring portion and an outer fixing portion which are sequentially connected from the inside to the outside;

[0007] A magnetic circuit assembly, the magnetic circuit assembly comprising an additional magnetic steel, a yoke and a side magnetic structure arranged on the yoke, the side magnetic structure comprising a side magnetic steel and an annular washer, the annular washer comprising a connected flat plate portion and a vertical plate portion, the vertical plate portion being connected to the external fixing portion, and the side magnetic steel connecting the bottom surface of the flat plate portion and the yoke;

[0008] The first folding ring portion protrudes in a direction away from the flat plate portion, the additional magnetic steel is arranged on the top surface of the flat plate portion and corresponds to the first folding ring portion, and the top of the additional magnetic steel has the same magnetic pole polarity as the bottom of the edge magnetic steel.

[0009] In one embodiment, a first avoidance structure is provided on a side of the top of the additional magnetic steel away from the vertical plate portion, and the first avoidance structure is used to avoid the first folding ring portion.

[0010] In one embodiment, the first avoidance structure is an obtuse angle structure, a rounded angle structure or a stepped structure.

[0011] In one embodiment, the additional magnetic steel is in the shape of a long strip.

[0012] In one embodiment, the magnetic circuit assembly also includes a plurality of central magnetic structures arranged on the yoke, the central magnetic structure includes a central magnetic steel and a central washer, the bottom surface of the central magnetic steel is connected to the yoke, and the top surface of the central magnetic steel is connected to the central washer; it also includes a plurality of voice coils fixedly connected to the diaphragm assembly, the voice coils are arranged corresponding to the central magnetic structure, and at least a partial area of ​​a magnetic gap is formed between the central magnetic structure and the side magnetic structure for the voice coil to move.

[0013] In one embodiment, the inner fixed portion is provided with a window and also includes a connecting auxiliary membrane and an anti-magnetic steel structure, the connecting auxiliary membrane includes a convex cap and a second folding ring portion arranged around the convex cap, the second folding ring portion protrudes in a direction away from the center washer, the inner edge of the second folding ring portion is connected to the convex cap, the outer edge of the second folding ring portion is connected to the diaphragm assembly, and the connecting auxiliary membrane closes the window; the anti-magnetic steel structure is arranged on the top surface of the center washer and corresponds to the convex cap, the top of the anti-magnetic steel structure is located in the convex cap, the top surface of the anti-magnetic steel structure is connected to the convex cap, and the top of the anti-magnetic steel structure has the same magnetic pole polarity as the bottom of the center magnetic steel.

[0014] In one embodiment, the anti-magnetic steel structure includes a connected lower magnetic steel and an upper magnetic steel, the upper magnetic steel is located inside the convex cap, the lower magnetic steel is located below the convex cap, the peripheral wall of the upper magnetic steel is fixedly connected to the inner wall of the convex cap, and the top surface of the upper magnetic steel is fixedly connected to the inner top wall of the convex cap.

[0015] In one embodiment, a second avoidance structure is provided at an edge of the top of the lower magnetic steel, and the second avoidance structure is used to avoid the second folding ring portion.

[0016] In one embodiment, the inner edge of the second folding ring portion is connected to the top surface of the lower magnetic steel.

[0017] In one embodiment, the number of the central magnetic structures and the number of the voice coils are both plural, and the central magnetic structures and the voice coils are arranged in a one-to-one correspondence.

[0018] The beneficial effects of the utility model are as follows: the micro speaker has a novel structure, and the top surface of the annular washer is provided with an additional magnetic steel with a polarity opposite to that of the side magnetic steel, which strengthens the magnetic flux of the magnetic circuit component, is conducive to improving the BL value of the micro speaker, enhances the performance of the micro speaker, and can effectively improve the consumer experience. The convex design of the first folding ring part of the diaphragm component leaves enough space for the setting of the additional magnetic steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the structure of a micro speaker according to Embodiment 1 of the present utility model;

[0021] Figure 2 is a cross-sectional view of the micro-speaker of the first embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the micro-speaker according to the first embodiment of the present invention.

[0023] Description of Figure Numbers:

[0024] 1. diaphragm assembly; 11. inner fixing portion; 12. first folding ring portion; 13. outer fixing portion;

[0025] 2. Magnetic circuit assembly; 21. Additional magnetic steel; 211. First avoidance structure; 22. Yoke iron; 231. Side magnetic steel; 232. Ring washer; 2321. Flat plate; 2322. Vertical plate; 24. Central magnetic structure;

[0026] 3. Voice coil;

[0027] 4. Connecting auxiliary film; 41. Convex cap; 42. Second folding ring;

[0028] 5. Anti-magnetic steel structure; 51. Lower magnetic steel; 511. Second avoidance structure; 52. Upper magnetic steel. DETAILED DESCRIPTION

[0029] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] 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 components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0033] In addition, if the meaning of "and / or" appears in the full text is to include three parallel solutions, taking "and / or" as an example, it includes solutions, or solutions, or solutions that are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. 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 required by this utility model.

[0034] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Embodiment 1

[0036] Please refer to Figures 1 to 3 Embodiment 1 of the present invention is: a micro speaker, comprising a diaphragm assembly 1, a magnetic circuit assembly 2 and a plurality of voice coils 3, wherein the diaphragm assembly 1 comprises an inner fixing portion 11, a first folding ring portion 12 and an outer fixing portion 13 which are sequentially connected from the inside to the outside, and the voice coil 3 is fixedly connected to the diaphragm assembly 1. Specifically, the voice coil 3 is fixedly connected to the inner fixing portion 11. In this embodiment, the diaphragm assembly 1 comprises a sound membrane and a ball top provided on the sound membrane. In a specific product, it is also acceptable for the diaphragm assembly 1 not to have the ball top.

[0037] The magnetic circuit assembly 2 includes an additional magnetic steel 21, a yoke 22, and side magnetic structures and a plurality of central magnetic structures 24 respectively arranged on the yoke 22. The central magnetic structure 24 includes a central magnetic steel and a central washer. The bottom surface of the central magnetic steel is connected to the yoke 22, and the top surface of the central magnetic steel is connected to the central washer. The voice coil 3 is arranged corresponding to the central magnetic structure 24. At least a partial area of ​​the magnetic gap for the movement of the voice coil 3 is formed between the central magnetic structure 24 and the side magnetic structure. The side magnetic structure includes a side magnetic steel. Steel 231 and an annular washer 232, the annular washer 232 includes a connected flat plate portion 2321 and a vertical plate portion 2322, the edge magnetic steel 231 connects the bottom surface of the flat plate portion 2321 and the yoke 22, the vertical plate portion 2322 is connected to the external fixing portion 13, that is, in this embodiment, the annular washer 232 can be used as a basin frame. The micro speaker cancels the basin frame design, which not only makes the overall volume of the micro speaker smaller, but also simplifies the assembly process of the micro speaker and saves the assembly cost of the micro speaker.

[0038] The first folding ring portion 12 protrudes in a direction away from the flat plate portion 2321, and the additional magnetic steel 21 is arranged on the top surface of the flat plate portion 2321 and corresponds to the first folding ring portion 12. Preferably, the additional magnetic steel 21 is in the shape of an elongated strip, and the top of the additional magnetic steel 21 has the same magnetic pole polarity as the bottom of the edge magnetic steel 231, that is, when the top of the additional magnetic steel 21 is an N pole, the bottom of the edge magnetic steel 231 is also an N pole; when the top of the additional magnetic steel 21 is an S pole, the bottom of the edge magnetic steel 231 is also an S pole.

[0039] A first avoidance structure 211 is provided on the top of the additional magnetic steel 21 away from the vertical plate portion 2322. The first avoidance structure 211 is used to avoid the first folding ring portion 12, thereby preventing the diaphragm assembly 1 from touching the additional magnetic steel 21 during downward vibration. The first avoidance structure 211 is an obtuse angle structure, a rounded angle structure, a stepped structure, etc.

[0040] In this embodiment, a window is provided on the inner fixing portion 11, and the micro-speaker further comprises a connecting auxiliary membrane 4 and an anti-magnetic steel structure 5, wherein the connecting auxiliary membrane 4 comprises a convex cap 41 and a second folding ring portion 42 arranged around the convex cap 41, wherein the second folding ring portion 42 protrudes in a direction away from the center washer, an inner edge of the second folding ring portion 42 is connected to the convex cap 41, an outer edge of the second folding ring portion 42 is connected to the diaphragm assembly 1, and the connecting auxiliary membrane 4 closes the window; the anti-magnetic steel structure 5 is arranged on the top surface of the center washer and corresponds to the convex cap 41, the top of the anti-magnetic steel structure 5 is located in the convex cap 41, the top surface of the anti-magnetic steel structure 5 is connected to the convex cap 41, and the top of the anti-magnetic steel structure 5 has the same polarity as the bottom magnetic pole of the center magnetic steel, that is, when the top of the anti-magnetic steel structure 5 is an N pole, the bottom of the center magnetic steel is also an N pole; when the top of the anti-magnetic steel structure 5 is an S pole, the bottom of the center magnetic steel is also an S pole.

[0041] Preferably, the height of the convex cap 41 is equal to or similar to the outer convex height of the second fold ring portion 42 ; the outer convex height of the first fold ring portion 12 is equal to or similar to the outer convex height of the second fold ring portion 42 .

[0042] In this embodiment, the connecting auxiliary membrane 4 is connected to the dome. In other embodiments, the connecting auxiliary membrane 4 can be connected to the sound membrane.

[0043] Since the first folding ring portion 12 adopts an outward convex structure, under the premise of not changing the overall volume of the micro speaker, by adding an anti-magnetic steel structure 5 above the central magnetic steel, the BL value of the micro speaker can be increased to a greater extent, thereby further improving the performance of the micro speaker.

[0044] The anti-magnetic steel structure 5 includes a lower magnetic steel 51 and an upper magnetic steel 52 connected to each other, wherein the upper magnetic steel 52 is located inside the convex cap 41, and the lower magnetic steel 51 is located below the convex cap 41. The peripheral wall of the upper magnetic steel 52 is fixedly connected to the inner wall of the convex cap 41, and the top surface of the upper magnetic steel 52 is fixedly connected to the inner top wall of the convex cap 41. The upper magnetic steel 52 and the lower magnetic steel 51 can be either an integrated structure or a split structure, which can be specifically configured according to actual needs.

[0045] Preferably, a second avoidance structure 511 is provided on the top edge of the lower magnetic steel 51, and the second avoidance structure 511 is used to avoid the second folding ring portion 42, so as to prevent the second folding ring portion 42 from touching the lower magnetic steel 51 during the deformation process and generating noise. The second avoidance structure 511 is an obtuse angle structure, a rounded angle structure, a stepped structure, etc.

[0046] To improve the structural stability of the micro speaker, optionally, the inner edge of the second folding ring portion 42 is connected to the top surface of the lower magnetic steel 51 .

[0047] As a preferred embodiment, the number of the central magnetic structure 24 and the number of the voice coils 3 are both multiple, and the central magnetic structure 24 is arranged one-to-one with the voice coils 3. Compared with the micro speaker with a single voice coil 3 architecture, the micro speaker with a multi-voice coil 3 architecture has better performance.

[0048] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used 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 A diaphragm assembly, wherein the diaphragm assembly comprises an inner fixing portion, a first folding ring portion and an outer fixing portion which are sequentially connected from the inside to the outside; A magnetic circuit assembly, the magnetic circuit assembly comprising an additional magnetic steel, a yoke and a side magnetic structure arranged on the yoke, the side magnetic structure comprising a side magnetic steel and an annular washer, the annular washer comprising a connected flat plate portion and a vertical plate portion, the vertical plate portion being connected to the external fixing portion, and the side magnetic steel connecting the bottom surface of the flat plate portion and the yoke; The first folding ring portion protrudes in a direction away from the flat plate portion, the additional magnetic steel is arranged on the top surface of the flat plate portion and corresponds to the first folding ring portion, and the top of the additional magnetic steel has the same magnetic pole polarity as the bottom of the edge magnetic steel.

2. The micro-speaker according to claim 1, characterized in that: A first avoidance structure is provided on a side of the top of the additional magnetic steel away from the vertical plate portion, and the first avoidance structure is used to avoid the first folding ring portion.

3. The micro-speaker according to claim 2, characterized in that: The first avoidance structure is an obtuse angle structure, a rounded angle structure or a stepped structure.

4. The micro-speaker according to claim 1, characterized in that: The additional magnetic steel is in the shape of a long strip.

5. The micro-speaker according to claim 1, characterized in that: The magnetic circuit assembly also includes a plurality of central magnetic structures arranged on the yoke, the central magnetic structures include a central magnetic steel and a central washer, the bottom surface of the central magnetic steel is connected to the yoke, and the top surface of the central magnetic steel is connected to the central washer; it also includes a plurality of voice coils fixedly connected to the diaphragm assembly, the voice coils are arranged corresponding to the central magnetic structure, and at least a partial area of ​​a magnetic gap is formed between the central magnetic structure and the side magnetic structure for the voice coil to move.

6. The micro-speaker according to claim 5, characterized in that: The inner fixed portion is provided with a window, and also includes a connecting auxiliary membrane and an anti-magnetic steel structure, the connecting auxiliary membrane includes a convex cap and a second folding ring portion arranged around the convex cap, the second folding ring portion protrudes in a direction away from the center washer, the inner edge of the second folding ring portion is connected to the convex cap, the outer edge of the second folding ring portion is connected to the diaphragm assembly, and the connecting auxiliary membrane closes the window; the anti-magnetic steel structure is arranged on the top surface of the center washer and corresponds to the convex cap, the top of the anti-magnetic steel structure is located in the convex cap, the top surface of the anti-magnetic steel structure is connected to the convex cap, and the top of the anti-magnetic steel structure has the same magnetic pole polarity as the bottom of the center magnetic steel.

7. The micro-speaker according to claim 6, characterized in that: The anti-magnetic steel structure includes a connected lower magnetic steel and an upper magnetic steel, the upper magnetic steel is located inside the convex cap, the lower magnetic steel is located below the convex cap, the peripheral wall of the upper magnetic steel is fixedly connected to the inner wall of the convex cap, and the top surface of the upper magnetic steel is fixedly connected to the inner top wall of the convex cap.

8. The micro-speaker according to claim 7, characterized in that: A second avoidance structure is provided at the edge of the top of the lower magnetic steel, and the second avoidance structure is used to avoid the second folding ring portion.

9. The micro-speaker according to claim 7, characterized in that: The inner edge of the second folding ring portion is connected to the top surface of the lower magnetic steel.

10. The micro-speaker according to claim 5, characterized in that: The number of the central magnetic structures and the number of the voice coils are both multiple, and the central magnetic structures and the voice coils are arranged in a one-to-one correspondence.

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