CN220422047U - Magnetic circuit assembly and miniature loudspeaker - Google Patents
Magnetic circuit assembly and miniature loudspeaker Download PDFInfo
- Publication number
- CN220422047U CN220422047U CN202322173137.4U CN202322173137U CN220422047U CN 220422047 U CN220422047 U CN 220422047U CN 202322173137 U CN202322173137 U CN 202322173137U CN 220422047 U CN220422047 U CN 220422047U
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- Prior art keywords
- central
- magnetic steel
- hole
- circuit assembly
- magnetic circuit
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 60
- 239000010959 steel Substances 0.000 claims abstract description 60
- 239000003292 glue Substances 0.000 claims abstract description 35
- 239000012790 adhesive layer Substances 0.000 claims abstract description 20
- 239000010410 layer Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
Landscapes
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
The utility model discloses a magnetic circuit assembly and a miniature loudspeaker, wherein the magnetic circuit assembly comprises a central magnetic steel, a central washer and a yoke, and a plurality of through holes are formed in the middle area of the central magnetic steel; the central washer is positioned on the top surface of the central magnetic steel and is fixedly connected with the central magnetic steel through a first adhesive layer; the yoke is positioned on the bottom surface of the central magnetic steel and is fixedly connected with the central magnetic steel through a second adhesive layer; a partial region of the first adhesive layer is positioned in the through hole and contacts the wall surface of the through hole, and a partial region of the second adhesive layer is positioned in the through hole and contacts the wall surface of the through hole. The through holes are formed in the middle area of the center magnetic steel, so that production consumables of the center magnetic steel are reduced, manufacturing cost of the magnetic circuit assembly is saved, magnetic lines of force in the middle area of the center magnetic steel are reduced, and the front magnetic leakage phenomenon of the micro-speaker is effectively improved. The through hole can be used as a glue containing structure for containing glue overflow, and the glue overflow is contacted with the wall surface of the through hole, so that the structural stability of the micro-speaker is improved, and the reliability falling risk is reduced.
Description
Technical Field
The present utility model relates to electroacoustic transducers, and more particularly to a magnetic circuit assembly and a micro speaker.
Background
The miniature loudspeaker comprises a basin frame and a magnetic circuit assembly and a vibration assembly which are respectively connected with the basin frame, wherein the vibration assembly comprises a vibrating diaphragm assembly and a voice coil, the vibrating diaphragm assembly and the voice coil are connected, the magnetic circuit assembly comprises a yoke and a central magnetic structure and a side magnetic structure which are respectively arranged on the yoke, the central magnetic structure comprises a central magnetic steel and a central washer arranged on the top surface of the central magnetic steel, and a magnetic gap for the voice coil to move is formed between the central magnetic structure and the side magnetic structure.
In order to enhance the magnetic field intensity of the micro-speaker and thus improve the performance of the micro-speaker, the prior art may choose to increase the volume of the center magnetic steel, and increase the volume of the center magnetic steel by increasing the area of the center magnetic steel under the condition that the height of the center magnetic steel remains unchanged. However, after the volume of the central magnetic steel is increased, the magnetic flux leakage phenomenon of the front face of the micro-speaker is aggravated, and the reason is that the magnetic force lines in the central area of the central magnetic steel are too dense, so that the side magnetic structure is not easy to guide.
In addition, after the volume of the central magnetic steel is increased, the phenomenon of degumming of the central magnetic steel and the yoke iron is easy to occur in the process of falling reliability test of the micro-speaker.
Disclosure of Invention
The technical problems solved by the utility model are as follows: provided are a stable-structure magnetic circuit assembly capable of reducing magnetic leakage and a micro-speaker having the same.
In order to solve the technical problems, the first technical scheme adopted by the utility model is as follows: a magnetic circuit assembly, comprising:
the central magnetic steel is provided with a plurality of through holes in the middle area;
the central washer is positioned on the top surface of the central magnetic steel and is fixedly connected with the central magnetic steel through a first adhesive layer;
the yoke is positioned on the bottom surface of the central magnetic steel and is fixedly connected with the central magnetic steel through a second adhesive layer;
the partial area of the first adhesive layer is positioned in the through hole and contacts the wall surface of the through hole, and the partial area of the second adhesive layer is positioned in the through hole and contacts the wall surface of the through hole.
Further, the number of the through holes is a plurality.
Further, the plurality of through holes are arranged in one or more rows.
Further, the through holes in a plurality are symmetrically arranged with respect to the central axis of the yoke.
Further, the end face of the through hole is round, oval or polygonal.
Further, the first glue layer comprises a first plane part and a first glue overflow part which are connected, the first glue overflow part is positioned in the through hole and contacts with the wall surface of the through hole, the first plane part is positioned between the center magnetic steel and the center washer, and the first plane part is respectively contacted with the center magnetic steel and the center washer.
Further, the first glue overflow part is in a discontinuous or continuous annular frame shape.
Further, the second glue layer comprises a second plane part and a second glue overflow part which are connected, the second glue overflow part is positioned in the through hole and contacts with the wall surface of the through hole, the second plane part is positioned between the center magnetic steel and the yoke, and the second plane part is respectively contacted with the center magnetic steel and the yoke.
Further, the second glue overflow part is in a discontinuous or continuous annular frame shape.
In order to solve the technical problems, the second technical scheme adopted by the utility model is as follows: the miniature loudspeaker comprises the magnetic circuit assembly.
The utility model has the beneficial effects that: the through holes communicated with the top surface and the bottom surface of the central magnetic steel are formed in the middle area of the central magnetic steel, so that production consumables of the central magnetic steel are reduced, manufacturing cost of the magnetic circuit assembly is saved, magnetic lines of force in the middle area of the central magnetic steel are reduced, and the front magnetic leakage phenomenon of the miniature loudspeaker is effectively improved. In addition, the through hole can also be used as a glue containing structure for containing glue overflow, and the glue overflow contacts with the wall surface of the through hole, so that the transverse and vertical multidirectional bonding between the central magnetic steel and the central washer/yoke is realized, the bonding force between the central magnetic steel and the central washer/yoke is favorably improved, the structural stability of the micro-speaker is improved, and the reliability falling risk is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a part of a magnetic circuit assembly according to a first embodiment of the present utility model;
FIG. 2 is a cross-sectional view of the structure shown in FIG. 1;
fig. 3 is an enlarged view at a in fig. 2.
Reference numerals illustrate:
1. a yoke;
2. a center magnetic steel; 21. a through hole;
3. a central washer;
4. a first adhesive layer; 41. a first planar portion; 42. a first glue overflow part;
5. a second adhesive layer; 51. a second planar portion; 52. and a second glue overflow part.
Detailed Description
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, in the embodiment of the present utility model, directional indications such as up, down, left, right, front, and rear … … are referred to, and the directional indication is merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture such as that shown in the drawings, and if the specific posture is changed, the directional indication is changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
In addition, if the meaning of "and/or" is presented throughout this document to include three parallel schemes, taking "and/or" as an example, including a scheme, or a scheme that is satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
Example 1
Referring to fig. 1 to 3, a first embodiment of the present utility model is as follows: the micro loudspeaker can be applied to electronic equipment such as mobile phones, intelligent watches, tablet computers, game handles and the like.
The miniature loudspeaker comprises a basin frame, and a vibration assembly and a magnetic circuit assembly which are respectively connected with the basin frame, wherein the vibration assembly comprises a vibrating diaphragm assembly and a voice coil, the vibrating diaphragm assembly is connected with the voice coil and the basin frame, in the embodiment, the vibrating diaphragm assembly comprises a sound membrane and a dome which are connected, and in other embodiments, the vibrating diaphragm assembly does not have the dome.
The magnetic circuit assembly comprises a yoke 1, a central magnetic structure and a side magnetic structure, wherein the central magnetic structure and the side magnetic structure are respectively connected with the yoke 1, the central magnetic structure is positioned between at least one group of two side magnetic structures which are oppositely arranged, and a magnetic gap for the voice coil to move is formed between the central magnetic structure and the side magnetic structure.
In detail, the side magnetic structure comprises side magnetic steel and Bian Huasi, wherein the side magnetic steel is respectively connected with the Bian Huasi and the yoke 1, and the Bian Huasi is connected with the basin frame; the central magnetic structure comprises a central washer 3 and a central magnetic steel 2, a plurality of through holes 21 are formed in the middle area of the central magnetic steel 2, the central washer 3 is located on the top surface of the central magnetic steel 2 and is fixedly connected with the central magnetic steel 2 through a first adhesive layer 4, and the central washer 3 covers the through holes 21; the yoke 1 is located on the bottom surface of the central magnetic steel 2 and is fixedly connected with the central magnetic steel 2 through a second adhesive layer 5.
Preferably, a partial region of the first adhesive layer 4 is located in the through hole 21 and contacts a wall surface of the through hole 21, and a partial region of the second adhesive layer 5 is located in the through hole 21 and contacts a wall surface of the through hole 21. It is easy to understand that the region of the first glue layer 4 located in the through hole 21 may be regarded as glue overflow formed during the process of bonding the central magnetic steel 2 and the central washer 3; similarly, the region of the second adhesive layer 5 located in the through hole 21 may be regarded as an overflow adhesive formed during the process of bonding the central magnetic steel 2 and the yoke 1.
Optionally, the number of the through holes 21 is plural, and the through holes 21 with the plural number are arranged in one row or multiple rows. In order to make the magnetic fields of the magnetic circuit assembly more uniform, it is preferable that the plurality of through holes 21 are symmetrically arranged with respect to the central axis of the yoke 1.
The end surface of the through hole 21 is circular, elliptical, polygonal or other special-shaped, and the polygonal includes but is not limited to triangle, rectangle, pentagon, hexagon and the like.
Specifically, the first adhesive layer 4 includes a first plane portion 41 and a first glue overflow portion 42 that are connected, the first glue overflow portion 42 is located in the through hole 21 and contacts a wall surface of the through hole 21, the first plane portion 41 is located between the central magnetic steel 2 and the central washer 3, and the first plane portion 41 contacts the central magnetic steel 2 and the central washer 3 respectively; in this embodiment, the first glue overflow portion 42 is in a continuous annular frame shape, so that the bonding strength between the central magnetic steel 2 and the central washer 3 can be improved to a greater extent, and in other embodiments, the first glue overflow portion 42 may also be in an intermittent annular frame shape, so that the processing precision requirement can be reduced, and the cost is saved.
The second glue layer 5 comprises a second plane part 51 and a second glue overflow part 52 which are connected, the second glue overflow part 52 is positioned in the through hole 21 and contacts the wall surface of the through hole 21, the second plane part 51 is positioned between the central magnetic steel 2 and the yoke 1, and the second plane part 51 is respectively contacted with the central magnetic steel 2 and the yoke 1; in this embodiment, the second glue overflow portion 52 is in a continuous annular frame shape, so that the bonding strength between the center magnetic steel 2 and the yoke 1 can be improved to a greater extent, and in other embodiments, the second glue overflow portion 52 may also be in an intermittent annular frame shape, so that the processing precision requirement can be reduced, and the cost is saved.
The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (10)
1. A magnetic circuit assembly, characterized in that: comprising
The central magnetic steel is provided with a plurality of through holes in the middle area;
the central washer is positioned on the top surface of the central magnetic steel and is fixedly connected with the central magnetic steel through a first adhesive layer;
the yoke is positioned on the bottom surface of the central magnetic steel and is fixedly connected with the central magnetic steel through a second adhesive layer;
the partial area of the first adhesive layer is positioned in the through hole and contacts the wall surface of the through hole, and the partial area of the second adhesive layer is positioned in the through hole and contacts the wall surface of the through hole.
2. The magnetic circuit assembly of claim 1, wherein: the number of the through holes is a plurality of.
3. The magnetic circuit assembly of claim 2, wherein: the plurality of through holes are arranged in one row or a plurality of rows.
4. A magnetic circuit assembly according to claim 3, wherein: the plurality of through holes are symmetrically arranged with respect to the central axis of the yoke.
5. The magnetic circuit assembly of claim 1, wherein: the end face of the through hole is round, elliptic or polygonal.
6. The magnetic circuit assembly of claim 1, wherein: the first glue layer comprises a first plane part and a first glue overflow part which are connected, the first glue overflow part is positioned in the through hole and contacts with the wall surface of the through hole, the first plane part is positioned between the central magnetic steel and the central washer, and the first plane part is respectively contacted with the central magnetic steel and the central washer.
7. The magnetic circuit assembly of claim 6, wherein: the first glue overflow part is in a discontinuous or continuous annular frame shape.
8. The magnetic circuit assembly of claim 1, wherein: the second glue layer comprises a second plane part and a second glue overflow part which are connected, the second glue overflow part is positioned in the through hole and contacts with the wall surface of the through hole, the second plane part is positioned between the center magnetic steel and the yoke, and the second plane part is respectively contacted with the center magnetic steel and the yoke.
9. The magnetic circuit assembly of claim 8, wherein: the second glue overflow part is in a discontinuous or continuous annular frame shape.
10. Miniature speaker, its characterized in that: a magnetic circuit assembly as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322173137.4U CN220422047U (en) | 2023-08-11 | 2023-08-11 | Magnetic circuit assembly and miniature loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322173137.4U CN220422047U (en) | 2023-08-11 | 2023-08-11 | Magnetic circuit assembly and miniature loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220422047U true CN220422047U (en) | 2024-01-30 |
Family
ID=89654253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322173137.4U Active CN220422047U (en) | 2023-08-11 | 2023-08-11 | Magnetic circuit assembly and miniature loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220422047U (en) |
-
2023
- 2023-08-11 CN CN202322173137.4U patent/CN220422047U/en active Active
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