CN220422031U

CN220422031U - Micro-speaker

Info

Publication number: CN220422031U
Application number: CN202321617838.6U
Authority: CN
Inventors: 林嘉平; 董庆宾
Original assignee: Shenzhen Weishi Acoustics Co Ltd
Current assignee: Shenzhen Weishi Acoustics Co Ltd
Priority date: 2023-06-25
Filing date: 2023-06-25
Publication date: 2024-01-30
Anticipated expiration: 2033-06-25

Abstract

The utility model discloses a micro-speaker, which comprises a vibrating diaphragm assembly, an auxiliary voice coil and a plurality of working voice coils; the number of the auxiliary voice coils is smaller than that of the working voice coils; the auxiliary voice coil is respectively connected with the working voice coil and the vibrating diaphragm assembly, the auxiliary voice coil and the working voice coil are arranged in a staggered mode, two adjacent edges of the working voice coil and the vibrating diaphragm assembly form a first air flow passage communicated with the inner cavities of the two adjacent working voice coils, and the part of the working voice coil, which is positioned at the outer side of the auxiliary voice coil, and a second air flow passage communicated with the inner cavities and the outer space of the working voice coil are formed between the vibrating diaphragm assemblies. The auxiliary voice coil and the working voice coil are arranged in a staggered mode to form a first air flow channel and a second air flow channel, so that the smooth degree of air flow exchange between the inner cavity of the working voice coil and the outer space is effectively improved, and the high-frequency sensitivity of the miniature loudspeaker is improved.

Description

Micro-speaker

Technical Field

The utility model relates to the technical field of electroacoustic transducers, in particular to a miniature loudspeaker.

Background

The micro-speaker is widely applied to portable electronic devices such as mobile phones, notebook computers, hearing aids and the like. With the rapid development of these portable electronic devices, performance requirements for the micro-speakers used thereon are increasing.

In order to promote micro-speaker's performance, prior art begins to adopt many voice coils design, simultaneously, in order to make the position that the work voice coil loudspeaker voice coil is located magnetic gap more suitable, partial micro-speaker can add auxiliary voice coil (when micro-speaker work, work voice coil loudspeaker voice coil circular telegram, auxiliary voice coil loudspeaker voice coil is not circular telegram) between work voice coil loudspeaker voice coil and vibrating diaphragm subassembly, adjusts the position of work voice coil loudspeaker voice coil at magnetic gap through the height of adjustment auxiliary voice coil loudspeaker voice coil, makes micro-speaker's performance further promote.

Currently, in the miniature loudspeaker of many voice coil loudspeaker voice coil architectures, work voice coil loudspeaker voice coil and supplementary voice coil loudspeaker voice coil are generally one-to-one setting, work voice coil loudspeaker voice coil and vibrating diaphragm subassembly connecting region are annular closed region, lead to the inner chamber of work voice coil loudspeaker voice coil can only form the opening in its bottom in order to carry out the air current exchange with the outside space of work voice coil loudspeaker voice coil, cause miniature loudspeaker's high frequency sensitivity to receive certain influence, moreover, supplementary voice coil loudspeaker voice coil add, further increased the height of the inner chamber of work voice coil loudspeaker voice coil, make the whole volume increase of the inner chamber of work voice coil loudspeaker voice coil, thereby make the inside air current exchange of miniature loudspeaker become more difficult, miniature loudspeaker's high frequency sensitivity further worsens.

Disclosure of Invention

The technical problems solved by the utility model are as follows: a micro-speaker with high frequency sensitivity is provided.

In order to solve the technical problems, the utility model adopts the following technical scheme: a micro-speaker, comprising:

a diaphragm assembly;

a plurality of working voice coils;

the number of the auxiliary voice coils is smaller than that of the working voice coils;

the auxiliary voice coil is respectively connected with the working voice coil and the vibrating diaphragm assembly, the auxiliary voice coil and the working voice coil are arranged in a staggered mode, two adjacent edges of the working voice coil and the vibrating diaphragm assembly form a first air flow passage communicated with the inner cavities of the two adjacent working voice coils, and the part of the working voice coil, which is positioned at the outer side of the auxiliary voice coil, and a second air flow passage communicated with the inner cavities and the outer space of the working voice coil are formed between the vibrating diaphragm assemblies.

In an embodiment, the voice coil motor further comprises a magnetic circuit assembly, wherein the magnetic circuit assembly is provided with a magnetic gap for the working voice coil to move, and an avoidance groove for avoiding the auxiliary voice coil is formed in the top of the magnetic circuit assembly.

In an embodiment, the combined voice coil formed by connecting the auxiliary voice coil and the working voice coil is in an axisymmetric structure.

In one embodiment, at least one set of two adjacent working coils are in contact with each other and/or at least one set of two adjacent working coils has a gap therebetween.

In one embodiment, the number of the working voice coils is two, and the number of the auxiliary voice coils is one.

In an embodiment, the number of the working voice coils is greater than or equal to three, the number of the auxiliary voice coils is greater than or equal to two, at least one group of two adjacent auxiliary voice coils are in contact with each other, and/or at least one group of two adjacent auxiliary voice coils have a gap therebetween.

In one embodiment, the number of the working voice coils is three, and the number of the auxiliary voice coils is two.

In one embodiment, the number of the working voice coils is four, and the number of the auxiliary voice coils is two or three.

In an embodiment, the auxiliary voice coil is wound by a first wire, the working voice coil is wound by a second wire, and the material density of the first wire is less than or equal to the material density of the second wire.

In one embodiment, the joint surface of the auxiliary voice coil and the working voice coil forms a jogged structure.

The utility model has the beneficial effects that:

the miniature loudspeaker is simple in structure, the number of the auxiliary voice coils is less than that of the working voice coils, the number of the auxiliary voice coils is reduced, the raw material cost of the miniature loudspeaker component parts can be reduced, meanwhile, the manufacturing process of the miniature loudspeaker can be reduced, and the assembly cost of the miniature loudspeaker can be reduced. The number of auxiliary voice coils can also lighten the overall weight of the vibration assembly after being reduced, and the sensitivity of the micro-speaker is improved.

The auxiliary voice coil and the working voice coil are arranged in a staggered manner to form the first air flow channel and the second air flow channel, so that the inner cavity of the working voice coil can exchange air flow with the outer space through the lower opening, and the second air flow channel on the upper part can exchange air flow with the outer space, thereby effectively improving the smoothness of the air flow exchange between the inner cavity of the working voice coil and the outer space, and improving the high-frequency sensitivity of the micro-speaker.

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 top view of a micro-speaker according to a first embodiment of the present utility model;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;

fig. 4 is a schematic structural diagram of a combined voice coil in a micro-speaker according to a first embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a combined voice coil in a micro-speaker according to a second embodiment of the present utility model;

fig. 6 is a cross-sectional view of a micro speaker according to a third embodiment of the present utility model;

fig. 7 is a schematic structural diagram of a combined voice coil in a micro-speaker according to a third embodiment of the present utility model;

fig. 8 is a schematic structural diagram of a combined voice coil in a micro-speaker according to a fourth embodiment of the present utility model;

fig. 9 is a schematic structural diagram of a combined voice coil in a micro-speaker according to a fifth embodiment of the present utility model.

Reference numerals illustrate:

1. a basin stand;

2. a magnetic circuit assembly; 21. a magnetic gap; 22. an avoidance groove;

3. a diaphragm assembly;

4. a combination voice coil; 41. an auxiliary voice coil; 42. working a voice coil;

51. a first air flow passage; 52. and a second air flow passage.

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 4, a first embodiment of the present utility model is as follows: the micro-speaker can be applied to electronic equipment such as mobile phones, notebook computers, hearing aids and the like.

The miniature loudspeaker comprises a basin frame 1, a magnetic circuit assembly 2 and a vibration assembly, wherein the magnetic circuit assembly 2 and the vibration assembly are respectively connected with the basin frame 1, the vibration assembly comprises a vibrating diaphragm assembly 3 and a combined voice coil 4 which are connected, the combined voice coil 4 comprises an auxiliary voice coil 41 and a plurality of working voice coils 42, the magnetic circuit assembly 2 is provided with magnetic gaps 21 for the working voice coils 42 to move, and the number of the auxiliary voice coils 41 is smaller than that of the working voice coils 42; the auxiliary voice coil 41 is respectively connected with the working voice coil 42 and the vibrating diaphragm assembly 3, the auxiliary voice coil 41 and the working voice coil 42 are arranged in a staggered mode, a first air flow passage 51 communicated with inner cavities of the two adjacent working voice coils 42 is formed between adjacent edges of the two adjacent working voice coils 42 and the vibrating diaphragm assembly 3, and a second air flow passage 52 communicated with the inner cavities and outer spaces of the working voice coils 42 is formed between the part, located outside the auxiliary voice coil 41, of the working voice coil 42 and the vibrating diaphragm assembly 3.

In order to avoid the collision between the auxiliary voice coil 41 and the magnetic circuit assembly 2 during the operation of the micro-speaker, optionally, an avoidance groove 22 for avoiding the auxiliary voice coil 41 is provided at the top of the magnetic circuit assembly 2. Specifically, the magnetic circuit assembly 2 includes a yoke, a central magnetic structure and a side magnetic structure, the central magnetic structure and the side magnetic structure are respectively disposed on the yoke, a partial region of the magnetic gap 21 is formed between the central magnetic structure and the side magnetic structure, and the avoidance groove 22 is disposed on one side of the central magnetic structure away from the yoke, that is, the avoidance groove 22 is disposed on the top of the central magnetic structure. More specifically, the central magnetic structure comprises a central magnetic steel and a central washer, the central magnetic steel is respectively connected with the central washer and the yoke, and the avoiding groove 22 is formed in the top surface of the central washer.

In order to balance the stress of the vibration assembly and improve the polarization of the working voice coil 42, it is preferable that the combined voice coil 4 formed by connecting the auxiliary voice coil 41 and the working voice coil 42 has an axisymmetric structure, and in this embodiment, the combined voice coil 4 is a combination formed by excluding other structural members except the vibration film assembly 3 from the vibration assembly.

At least one set of two adjacent ones of the working coils 42 are in contact with each other and/or at least one set of two adjacent ones of the working coils 42 have a gap therebetween. In this embodiment, the number of the working voice coils 42 is two, the number of the auxiliary voice coils 41 is one, the two working voice coils 42 are in contact with each other, and preferably, the two working voice coils 42 are connected and fixed with each other, which is beneficial to further improving the polarization phenomenon of the working voice coils 42, thereby ensuring the performance of the micro-speaker. There are many specific means for connecting and fixing the adjacent two working coils 42 to each other, such as glue connection, double-sided offset connection, self-adhesive layer connection of the enamel wire itself by winding the working coils 42, etc. Similarly, the working voice coil 42 and the auxiliary voice coil 41 may be connected by glue, by double sided tape, by a self-adhesive layer of the enameled wire itself, or by other means.

The wall thickness of the auxiliary voice coil 41 is smaller than or equal to the wall thickness of the working voice coil 42, and in order to control the weight of the auxiliary voice coil 41, it is preferable that the wall thickness of the auxiliary voice coil 41 is smaller than the wall thickness of the working voice coil 42. Of course, in some embodiments, it is also possible that the wall thickness of the auxiliary voice coil 41 is greater than the wall thickness of the working voice coil 42.

The auxiliary voice coil 41 is wound by a first wire material, and the working voice coil 42 is wound by a second wire material, wherein the material density of the first wire material is less than or equal to that of the second wire material. To control the weight of the auxiliary voice coil 41 and reduce the overall weight of the vibration assembly, it is preferable that the material density of the first wire is smaller than that of the second wire. The first wire may be a copper clad aluminum wire, an aluminum wire, or the like.

The cross-sectional shape of the first wire may be the same as or different from the cross-sectional shape of the second wire, and the cross-sectional shape of the first wire may be circular, elliptical, polygonal or other special-shaped, and similarly, the cross-section of the second wire may be vice versa; the cross-sectional dimension of the first wire may be the same as or different from the cross-sectional dimension of the second wire.

In order to improve the bonding strength between the auxiliary voice coil 41 and the working voice coil 42, optionally, a fitting structure is formed at the bonding surface between the auxiliary voice coil 41 and the working voice coil 42. Thus, the fixing area between the auxiliary voice coil 41 and the working voice coil 42 can be increased, the fixing effect is enhanced, for example, the junction of the working voice coil 42 and the auxiliary voice coil 41 can be in a step structure, and the two can be mutually matched and fixed into a whole.

Example two

Referring to fig. 5, a second embodiment of the present utility model is a parallel technical solution of the first embodiment, and is different from the first embodiment in that: with a gap between the two working voice coils 42.

Example III

Referring to fig. 6 and 7, a third embodiment of the present utility model is a parallel technical solution of the first embodiment, and is different from the first embodiment in that: the number of the working voice coils 42 is three, and the number of the auxiliary voice coils 41 is two.

When the number of the working voice coils 42 is greater than or equal to three and the number of the auxiliary voice coils 41 is greater than or equal to two, at least one set of two adjacent auxiliary voice coils 41 are in contact with each other and/or at least one set of two adjacent auxiliary voice coils 41 have a gap therebetween.

In this embodiment, the two auxiliary voice coils 41 are in contact with each other, and preferably, the two auxiliary voice coils 41 are fixedly connected to each other, which is advantageous for further improving the polarization of the working voice coil 42, thereby ensuring the performance of the micro-speaker. There are many specific means for connecting and fixing the adjacent two auxiliary voice coils 41 to each other, such as glue connection, double-sided offset connection, self-adhesive connection of the enameled wire itself for winding the auxiliary voice coils 41, or connection by other means.

Example IV

Referring to fig. 8, the fourth embodiment of the present utility model is a parallel solution of the third embodiment, and is different from the third embodiment in that: the number of the working voice coils 42 is four, and the number of the auxiliary voice coils 41 is two.

In this embodiment, a gap is provided between the two auxiliary voice coils 41, and in other embodiments, it is also possible that the two auxiliary voice coils 41 are in contact with each other.

Example five

Referring to fig. 9, the fifth embodiment of the present utility model is a parallel solution of the fourth embodiment, and is different from the fourth embodiment in that: the number of the working voice coils 42 is four, and the number of the auxiliary voice coils 41 is three.

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

1. Miniature speaker, its characterized in that: comprising

A diaphragm assembly;

a plurality of working voice coils;

2. A micro-speaker as claimed in claim 1, wherein: the voice coil motor further comprises a magnetic circuit assembly, wherein the magnetic circuit assembly is provided with a magnetic gap for the working voice coil to move, and an avoidance groove for avoiding the auxiliary voice coil is formed in the top of the magnetic circuit assembly.

3. A micro-speaker as claimed in claim 1, wherein: the combined voice coil formed by connecting the auxiliary voice coil and the working voice coil is of an axisymmetric structure.

4. A micro-speaker as claimed in claim 1, wherein: at least one group of two adjacent working voice coils are contacted with each other, and/or at least one group of two adjacent working voice coils have a gap therebetween.

5. A micro-speaker as claimed in claim 1, wherein: the number of the working voice coils is two, and the number of the auxiliary voice coils is one.

6. A micro-speaker as claimed in claim 1, wherein: the number of the working voice coils is greater than or equal to three, the number of the auxiliary voice coils is greater than or equal to two, at least one group of two adjacent auxiliary voice coils are in contact with each other, and/or at least one group of two adjacent auxiliary voice coils are provided with gaps.

7. A micro-speaker as claimed in claim 6, wherein: the number of the working voice coils is three, and the number of the auxiliary voice coils is two.

8. A micro-speaker as claimed in claim 6, wherein: the number of the working voice coils is four, and the number of the auxiliary voice coils is two or three.

9. A micro-speaker as claimed in claim 1, wherein: the auxiliary voice coil is formed by winding a first wire, the working voice coil is formed by winding a second wire, and the material density of the first wire is smaller than or equal to that of the second wire.

10. A micro-speaker as claimed in claim 1, wherein: and the joint surface of the auxiliary voice coil and the working voice coil forms a jogged structure.