Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a vibrating diaphragm assembly, a magnetic circuit assembly and a connecting auxiliary diaphragm, the vibrating 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, and the inner fixing part is provided with a plurality of windows; the magnetic circuit assembly is connected with the outer fixing part and comprises a yoke, a plurality of anti-magnetic steel structures and a plurality of central magnetic structures arranged on the yoke, the anti-magnetic steel structures are arranged on the top surfaces of the central magnetic structures and correspond to the windows, and the top of each anti-magnetic steel structure and the bottom of each central magnetic structure have the same magnetic pole polarity; the connecting auxiliary film comprises a convex cap and a second folding ring part arranged around the convex cap, the inner edge of the second folding ring part is connected with the convex cap, the outer edge of the second folding ring part is connected with the vibrating diaphragm assembly, and the connecting auxiliary film seals the window. The miniature loudspeaker is novel in structure, the arrangement of the anti-magnetic steel structure enhances the magnetic flux of the magnetic circuit assembly, the BL value of the miniature loudspeaker is improved, and the performance of the miniature loudspeaker with a multi-voice-coil structure is further 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] In order to improve the performance of micro speakers, micro speakers with multi-voice coil architecture came into being. Compared with micro speakers with single voice coil architecture, micro speakers with multi-voice coil architecture have larger BL value and better acoustic performance. However, in the face of increasingly stringent requirements for micro speakers in electronic devices such as mobile phones, the performance of micro speakers with multi-voice coil architecture needs to be further improved. Utility Model Content

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

[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, the diaphragm assembly comprising an inner fixing portion, a first folding ring portion and an outer fixing portion which are sequentially connected from the inside to the outside, and a plurality of openings are provided on the inner fixing portion;

[0007] A magnetic circuit component, the magnetic circuit component is connected to the external fixing part, the magnetic circuit component comprises a yoke, a plurality of anti-magnetic steel structures and a plurality of central magnetic structures arranged on the yoke, the anti-magnetic steel structure is arranged on the top surface of the central magnetic structure and corresponds to the window arrangement, and the top of the anti-magnetic steel structure has the same magnetic pole polarity as the bottom of the central magnetic structure;

[0008] A connecting auxiliary membrane comprises a convex cap and a second folding ring portion arranged around the convex cap, an inner edge of the second folding ring portion is connected to the convex cap, an outer edge of the second folding ring portion is connected to the diaphragm assembly, the connecting auxiliary membrane closes the window, and the top surface of the anti-magnetic steel structure is connected to the inner top surface of the convex cap.

[0009] In one embodiment, the peripheral wall of the upper region of the diamagnetic steel structure is connected to the inner wall surface of the convex cap.

[0010] In one embodiment, the second folding ring portion protrudes in a direction away from the yoke.

[0011] In one embodiment, the cross-section of the anti-magnetic steel structure is in a convex shape.

[0012] In one embodiment, the anti-magnetic steel structure has a avoiding structure for avoiding the second folding ring portion.

[0013] In one embodiment, the inner edge of the second folding ring portion is connected to the diamagnetic steel structure.

[0014] In one embodiment, the anti-magnetic steel structure includes an upper magnetic steel and a lower magnetic steel connected to each other, the bottom surface of the lower magnetic steel is connected to the central magnetic structure, and the top surface of the lower magnetic steel is connected to the bottom surface of the upper magnetic steel.

[0015] In one embodiment, the anti-magnetic steel structure includes an inner magnetic steel and an outer ring magnetic steel that are connected, the outer ring magnetic steel is sleeved on the inner magnetic steel, and the outer ring magnetic steel is located at the bottom of the inner magnetic steel and connected to the central magnetic structure.

[0016] In one embodiment, it further includes a plurality of voice coils, wherein the voice coils are connected to the diaphragm assembly, the voice coils are arranged around the window, and the voice coils correspond to the central magnetic structure one by one.

[0017] In one embodiment, outer wall surfaces of two adjacent voice coils are fixedly connected.

[0018] The beneficial effects of the present invention are as follows: the micro-speaker has a novel structure, and the top surface of the central magnetic structure is provided with an anti-magnetic steel structure with a magnetic pole opposite to that of the central magnetic structure, which strengthens the magnetic flux of the magnetic circuit component, is beneficial to improving the BL value of the micro-speaker, and further improves the performance of the micro-speaker with a multi-voice coil structure, which can effectively improve the consumer experience. 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 overall structure of the micro-speaker according to the first embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the micro-speaker according to the first embodiment of the present utility model;

[0022] Figure 3 is a cross-sectional view of the micro-speaker of the first embodiment of the utility model;

[0023] Figure 4 This is a cross-sectional view of another micro-speaker structure according to the first embodiment of the present invention.

[0024] Description of Figure Numbers:

[0025] 1. diaphragm assembly; 11. inner fixing portion; 12. first folding ring portion; 13. outer fixing portion;

[0026] 2. Magnetic circuit assembly; 21. Yoke iron; 22. Side magnetic structure; 23. Center magnetic structure; 24. Anti-magnetic steel structure; 25. Upper magnetic steel; 26. Lower magnetic steel; 27. Avoidance structure; 28. Internal magnetic steel; 29. ​​Outer ring magnetic steel;

[0027] 3. Voice coil;

[0028] 4. Connecting auxiliary film; 41. Convex cap; 42. Second folding ring part. 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 4 , Embodiment 1 of the utility model 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 has an inner fixing portion 11, a first folding ring portion 12 and an outer fixing portion 13 connected in sequence from the inside to the outside, the inner fixing portion 11 is provided with a plurality of openings, and the voice coil 3 is fixedly connected to the diaphragm assembly 1 and arranged around the openings. 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 dome disposed on the sound membrane. In a specific product, it is also acceptable that the diaphragm assembly 1 does not have the dome.

[0037] The magnetic circuit component 2 is connected to the external fixing part 13, and the magnetic circuit component 2 includes a yoke 21, a plurality of anti-magnetic steel structures 24, and side magnetic structures 22 and a plurality of center magnetic structures 23 respectively arranged on the yoke 21, the center magnetic structure 23 includes a center magnetic steel and a center washer, the bottom surface of the center magnetic steel is connected to the yoke 21, and the top surface of the center magnetic steel is connected to the center washer, the voice coil 3 is arranged in a one-to-one correspondence with the center magnetic structure 23, and at least a partial area of ​​a magnetic gap for the movement of the voice coil 3 is formed between the center magnetic structure 23 and the side magnetic structure 22, and the anti-magnetic steel structure 24 is arranged on the center magnetic The top surface of the structure 23 corresponds to the window setting, the top of the anti-magnetic steel structure 24 has the same magnetic polarity as the bottom of the central magnetic structure 23; the side magnetic structure 22 includes side magnetic steel and an annular washer, the annular washer includes a connected flat plate portion and a vertical plate portion, the side magnetic steel connects the bottom surface of the flat plate portion with the yoke 21, and the vertical plate portion is connected to the external fixed portion 13, that is, in this embodiment, the annular washer 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 connecting auxiliary membrane 4 includes a convex cap 41 and a second folding ring portion 42 arranged around the convex cap 41, the inner edge of the second folding ring portion 42 is connected to the convex cap 41, and the outer edge of the second folding ring portion 42 is connected to the diaphragm assembly 1. The connecting auxiliary membrane 4 closes the window, and the top surface of the anti-magnetic steel structure 24 is connected to the inner top surface of the convex cap 41. In order to improve the structural stability of the micro-speaker, optionally, the peripheral wall of the upper area of ​​the anti-magnetic steel structure 24 is connected to the inner wall surface of the convex cap 41.

[0039] The top of the anti-magnetic steel structure 24 has the same magnetic polarity as the bottom of the central magnetic structure 23, that is, when the top of the anti-magnetic steel structure 24 is an N pole, the bottom of the central magnetic steel is also an N pole; when the top of the anti-magnetic steel structure 24 is an S pole, the bottom of the central magnetic steel is also an S pole.

[0040] The first folding ring portion 12 protrudes in a direction away from the yoke 21 or is concave in a direction close to the yoke 21; the second folding ring portion 42 protrudes in a direction away from the yoke 21 or is concave in a direction close to the yoke 21, but in order to make the overall volume of the anti-magnetic steel structure 24 larger, it is preferred that the second folding ring portion 42 protrudes in a direction away from the yoke 21. Preferably, the height of the convex cap 41 is equal to or similar to the convex height of the second folding ring portion 42.

[0041] 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.

[0042] In order to further increase the BL value of the micro-speaker and improve the performance of the micro-speaker, it is preferred that the cross-section of the anti-magnetic steel structure 24 is convex-shaped, the convex area of ​​the anti-magnetic steel structure 24 is located in the convex cap 41, and the outline size of the horizontal area of ​​the anti-magnetic steel structure 24 is larger than the outline size of the horizontal cross-section of the convex cap 41.

[0043] The anti-magnetic steel structure 24 has an avoidance structure 27 for avoiding the second folding ring portion 42 . The avoidance structure 27 is an obtuse angle structure, a rounded angle structure, a stepped structure, etc.

[0044] The inner edge of the second folded ring portion 42 is connected to the anti-magnetic steel structure 24, which can improve the structural stability of the micro speaker to a greater extent.

[0045] The anti-magnetic steel structure 24 includes a lower magnetic steel 26 and an upper magnetic steel 25 connected to each other. The upper magnetic steel 25 is located in the convex cap 41, and the lower magnetic steel 26 is located below the convex cap 41. The peripheral wall of the upper magnetic steel 25 is fixedly connected to the inner wall of the convex cap 41, and the top surface of the upper magnetic steel 25 is fixedly connected to the inner top surface of the convex cap 41. The bottom surface of the lower magnetic steel 26 is connected to the central magnetic structure 23, and the top surface of the lower magnetic steel 26 is connected to the bottom surface of the upper magnetic steel 25. The upper magnetic steel 25 and the lower magnetic steel 26 can be either an integrated structure or a split structure, which can be specifically arranged according to actual needs.

[0046] As an alternative, the anti-magnetic steel structure 24 includes an internal magnetic steel 28 and an outer ring magnetic steel 29 connected to each other, the upper part of the internal magnetic steel 28 is located in the convex cap 41, the peripheral wall of the upper part of the internal magnetic steel 28 is fixedly connected to the inner wall of the convex cap 41, the top surface of the upper magnetic steel 25 is fixedly connected to the inner top surface of the convex cap 41, the outer ring magnetic steel 29 is sleeved on the internal magnetic steel 28, the outer ring magnetic steel 29 is located at the lower part of the internal magnetic steel 28 and connected to the central magnetic structure 23. The internal magnetic steel 28 and the outer ring magnetic steel 29 can be either an integrated structure or a split structure, which can be specifically arranged according to actual needs.

[0047] As a preferred implementation, the outer wall surfaces of two adjacent voice coils 3 are fixedly connected, such as by gluing, etc. This can improve the phenomenon of split vibration of the voice coil 3 and effectively improve the acoustic performance of the micro speaker.

[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, the diaphragm assembly comprising an inner fixing portion, a first folding ring portion and an outer fixing portion which are sequentially connected from the inside to the outside, and a plurality of openings are provided on the inner fixing portion; A magnetic circuit component, the magnetic circuit component is connected to the external fixing part, the magnetic circuit component comprises a yoke, a plurality of anti-magnetic steel structures and a plurality of central magnetic structures arranged on the yoke, the anti-magnetic steel structure is arranged on the top surface of the central magnetic structure and corresponds to the window arrangement, and the top of the anti-magnetic steel structure has the same magnetic pole polarity as the bottom of the central magnetic structure; A connecting auxiliary membrane comprises a convex cap and a second folding ring portion arranged around the convex cap, an inner edge of the second folding ring portion is connected to the convex cap, an outer edge of the second folding ring portion is connected to the diaphragm assembly, the connecting auxiliary membrane closes the window, and the top surface of the anti-magnetic steel structure is connected to the inner top surface of the convex cap.

2. The micro-speaker according to claim 1, characterized in that: The peripheral wall of the upper region of the diamagnetic steel structure is connected to the inner wall surface of the convex cap.

3. The micro-speaker according to claim 1, characterized in that: The second folding ring portion protrudes in a direction away from the yoke.

4. The micro-speaker according to claim 1, characterized in that: The cross section of the anti-magnetic steel structure is in a convex shape.

5. The micro-speaker according to claim 4, characterized in that: The anti-magnetic steel structure has an avoidance structure for avoiding the second folding ring portion.

6. The micro-speaker according to claim 4, characterized in that: The inner edge of the second folding ring portion is connected to the diamagnetic steel structure.

7. The micro-speaker according to claim 4, characterized in that: The anti-magnetic steel structure includes an upper magnetic steel and a lower magnetic steel connected to each other, the bottom surface of the lower magnetic steel is connected to the central magnetic structure, and the top surface of the lower magnetic steel is connected to the bottom surface of the upper magnetic steel.

8. The micro-speaker according to claim 4, characterized in that: The anti-magnetic steel structure includes an inner magnetic steel and an outer ring magnetic steel which are connected. The outer ring magnetic steel is sleeved on the inner magnetic steel. The outer ring magnetic steel is located at the lower part of the inner magnetic steel and is connected to the central magnetic structure.

9. The micro-speaker according to claim 1, characterized in that: It also includes a plurality of voice coils, wherein the voice coils are connected to the diaphragm assembly, the voice coils are arranged around the window, and the voice coils correspond to the central magnetic structure one by one.

10. The micro-speaker according to claim 9, characterized in that: The outer wall surfaces of two adjacent voice coils are fixedly connected.

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