Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a magnetic circuit assembly and a vibration assembly, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, the whole central magnetic structure is in a ring frame shape, the yoke is provided with a fixing table, and the fixing table is located in a hollow area of the central magnetic structure; the vibration assembly comprises a vibrating diaphragm assembly, a voice coil and a framework, the voice coil is connected with the vibrating diaphragm assembly through the framework, the framework comprises an elevated part, a horizontal part and a vertical part which are connected in sequence, the elevated part is located between the vibrating diaphragm assembly and the voice coil, and the vertical part is located in a hollow area of the central magnetic structure; the voice coil comprises a body and a lead wire which are connected, the lead wire is fixedly connected with the horizontal part, the vertical part and the fixed table respectively, the lead wire is provided with a plurality of bent sections, and the bent sections are located between the fixed table and the vertical part. The miniature loudspeaker is novel in structure, few in component parts and excellent in performance.

Description

Technical Field

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

[0002] In the prior art, in order to improve the performance of micro speakers, micro speakers often use large voice coils and large amplitude design structures.

[0003] The voice coil of a micro-speaker includes a connected body and leads. When the micro-speaker adopts a large-amplitude design, the leads of the voice coil must have a sufficient suspended length to avoid phenomena such as breakage caused by stress concentration. In the prior art, the leads are generally designed on the outside of the body. When the voice coil needs to vibrate with a larger amplitude, there is insufficient space on the outside of the voice coil, and thus, it is impossible to place side magnets or leads, resulting in the inability to further improve the performance of the micro-speaker. Utility Model Content

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

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

[0006] A magnetic circuit assembly, the magnetic circuit assembly comprising a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure being in the shape of a ring frame as a whole, a fixing platform being arranged on the yoke, and the fixing platform being located in a hollow area of ​​the central magnetic structure;

[0007] A vibration assembly, the vibration assembly comprising a diaphragm assembly, a voice coil and a frame, the voice coil is connected to the diaphragm assembly through the frame, the frame comprises a raised portion, a horizontal portion and a vertical portion connected in sequence, the raised portion is located between the diaphragm assembly and the voice coil, and the vertical portion is located in the hollow area of ​​the central magnetic structure;

[0008] The voice coil comprises a connected body and a lead wire, the lead wire is fixedly connected to the horizontal part, the vertical part and the fixing platform respectively, the lead wire has a plurality of bending sections, and the bending sections are located between the fixing platform and the vertical part.

[0009] In one embodiment, the bottom end of the vertical portion has an arc-shaped transition portion, and the lead is fixedly connected to the arc-shaped transition portion.

[0010] In one embodiment, the yoke is provided with a clearance groove for evading the lead wire.

[0011] In one embodiment, the number of the leads is two, and the two leads are axially symmetrical or centrally symmetrical.

[0012] In one embodiment, the skeleton is axisymmetric or centrosymmetric.

[0013] In one embodiment, the fixing platform is provided with a via hole and further includes an electrical conductive structure, the electrical conductive structure passes through the via hole and is electrically connected to the lead wire, and a partial area of ​​the electrical conductive structure is exposed outside the yoke.

[0014] In one embodiment, an insulating rubber block is provided in the via hole, and the electrically conductive structure is electrically isolated from the yoke by the insulating rubber block.

[0015] In one embodiment, the central magnetic structure includes an annular central magnetic steel and an annular central washer located above the annular central magnetic steel, and the annular central magnetic steel is fixedly connected to the yoke and the annular central washer respectively.

[0016] The beneficial effects of the utility model are:

[0017] The micro speaker has a novel structure and few components. The micro speaker can simultaneously adopt a large voice coil and a large amplitude design architecture. While the voice coil can be maximized, the lead wire can also have a sufficient suspended length, thereby effectively improving the acoustic performance of the micro speaker. At the same time, since the side magnetic structure outside the voice coil does not need to avoid the voice coil lead wire, the overall volume of the side magnetic structure can be set larger, thereby further improving the acoustic performance of the micro speaker.

[0018] The utilization rate of the magnetic flux lines in the central area of ​​the central magnetic structure is relatively low. Hollowing out the central area of ​​the central magnetic structure has little effect on the magnetic field of the micro-speaker itself, which is beneficial to ensuring the performance of the micro-speaker.

[0019] The skeleton can adjust the depth of the voice coil extending into the magnetic gap, which is beneficial to further improve the performance of the micro speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 An exploded view of the micro speaker of the first embodiment of the utility model;

[0022] Figure 2 is a cross-sectional view of the micro-speaker of the first embodiment of the utility model;

[0023] Figure 3The internal structure of the micro speaker of the first embodiment of the utility model is shown in FIG. Figure 1 ;

[0024] Figure 4 The internal structure of the micro speaker of the first embodiment of the utility model is shown in FIG. Figure 2 .

[0025] Description of Figure Numbers:

[0026] 1. Basin stand;

[0027] 2. Yoke iron; 21. Fixed platform;

[0028] 3. Center magnetic structure; 31. Ring-shaped center magnetic steel; 32. Ring-shaped center washer;

[0029] 4. Edge magnetic structure;

[0030] 5. Diaphragm assembly; 51. Sound film; 52. Dome;

[0031] 6. Voice coil; 61. Body; 62. Lead wire; 621. Bend section;

[0032] 7. frame; 71. elevated portion; 72. horizontal portion; 73. vertical portion; 74. arc-shaped transition portion;

[0033] 8. Electrically conductive structure;

[0034] 9. Insulating rubber block. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Embodiment 1

[0042] Please refer to Figures 1 to 4, Embodiment 1 of the utility model is: a micro speaker, comprising a basin frame 1, a magnetic circuit assembly and a vibration assembly, wherein the magnetic circuit assembly and the vibration assembly are respectively fixedly connected to the basin frame 1, the magnetic circuit assembly comprises a yoke 2 and a central magnetic structure 3 and a side magnetic structure 4 respectively arranged on the yoke 2, the central magnetic structure 3 is in the shape of a ring frame as a whole, a fixing platform 21 is arranged on the yoke 2, and the fixing platform 21 is located in the hollow area of ​​the central magnetic structure 3; the vibration assembly comprises a diaphragm assembly 5, a voice coil 6 and a skeleton 7, the voice coil 6 is connected to the diaphragm assembly 5 through the skeleton 7, and the skeleton 7 comprises a series of connected elevated The raised portion 71, the horizontal portion 72 and the vertical portion 73, the raised portion 71 is located between the diaphragm assembly 5 and the voice coil 6, the vertical portion 73 is located in the hollow area of ​​the central magnetic structure 3; the voice coil 6 includes a connected body 61 and a lead 62, the top of the body 61 is connected to the raised portion 71, the lead 62 is respectively fixedly connected to the horizontal portion 72, the vertical portion 73 and the fixing platform 21, such as by gluing, etc., the lead 62 has a plurality of bending sections 621, the bending sections 621 are located between the fixing platform 21 and the vertical portion 73, the bending sections 621 are used to provide deformation margin.

[0043] In order to prevent the skeleton 7 from scratching the lead 62 and causing damage to the lead 62 , preferably, the bottom end of the vertical portion 73 has an arc-shaped transition portion 74 , and the lead 62 is fixedly connected to the arc-shaped transition portion 74 .

[0044] In the present embodiment, the diaphragm assembly 5 includes a sound membrane 51 and a dome 52 arranged on the sound membrane 51. In other embodiments, the diaphragm assembly 5 may only have the sound membrane 51 but not the dome 52. The specific selection and setting can be made according to actual needs. As a preferred embodiment, the horizontal portion 72 and the sound membrane 51 are located on the same side of the dome 52 and are fixedly connected to the dome 52 respectively. In this way, the cross-sectional height of the micro speaker can be lower.

[0045] The central magnetic structure 3 includes an annular central magnetic steel 31 and an annular central washer 32 located above the annular central magnetic steel 31, and the annular central magnetic steel 31 connects the annular central washer 32 and the yoke 2. As a preferred embodiment, the side magnetic structure 4 includes an annular side magnetic steel and an annular washer, the annular washer connects the annular side magnetic steel and the basin frame 1, and the annular side magnetic steel connects the yoke 2, which can enhance the magnetic field of the micro speaker to a greater extent. Of course, in other embodiments, it is also possible for the side magnetic structure 4 to include at least two long strips of side magnetic steel. In this case, the central magnetic structure 3 is located between the two side magnetic steels that are relatively arranged. In addition, in a specific product, the side magnetic structure 4 can also be replaced by a flange formed by bending the edge of the yoke 2.

[0046] Optionally, the yoke 2 is provided with an escape groove for evading the lead 62 , so as to avoid the lead 62 colliding with the yoke 2 during the operation of the micro speaker, which is beneficial to ensuring the sound performance of the micro speaker.

[0047] The number of the lead wires 62 is two, and the two lead wires 62 are axially symmetrical or centrally symmetrical; the frame 7 is axially symmetrical or centrally symmetrical. In this way, the traction force of the lead wires 62 on the vibration component can be symmetrically balanced, avoiding the vibration component being unbalanced due to the influence of the traction force, thereby causing rolling vibration.

[0048] The fixing platform 21 is provided with a via hole, and the micro speaker further includes an electrical conductive structure 8, the electrical conductive structure 8 is electrically connected to the second pad through the via hole, a part of the electrical conductive structure 8 is exposed to the yoke 2, and the electrical conductive structure 8 can be a wire, a metal conductive structure, etc., and an external power source supplies power to the body 61 through the electrical conductive structure 8 via the lead 62. It is easy to understand that in a specific product, a part of the lead 62 can also be directly used as the electrical conductive structure 8.

[0049] Furthermore, an insulating rubber block 9 is provided in the via hole, and the electrically conductive structure 8 is electrically isolated from the yoke 2 by the insulating rubber block 9. When the electrically conductive structure 8 is a metal conductive structural component, the electrically conductive structure 8 and the insulating rubber block 9 are preferably an integrated structure of insert injection molding.

[0050] In this embodiment, the fixing platform 21 is formed by stamping a partial area of ​​the yoke 2. In other embodiments, the fixing platform 21 and the yoke 2 can also be a split structure. In this case, in some products, the insulating rubber block 9 itself can be identified as the fixing platform 21.

[0051] 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 magnetic circuit assembly, the magnetic circuit assembly comprising a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure being in the shape of a ring frame as a whole, a fixing platform being arranged on the yoke, and the fixing platform being located in a hollow area of ​​the central magnetic structure; A vibration assembly, the vibration assembly comprising a diaphragm assembly, a voice coil and a frame, the voice coil is connected to the diaphragm assembly through the frame, the frame comprises a raised portion, a horizontal portion and a vertical portion connected in sequence, the raised portion is located between the diaphragm assembly and the voice coil, and the vertical portion is located in the hollow area of ​​the central magnetic structure; The voice coil comprises a connected body and a lead wire, the lead wire is fixedly connected to the horizontal part, the vertical part and the fixing platform respectively, the lead wire has a plurality of bending sections, and the bending sections are located between the fixing platform and the vertical part.

2. The micro-speaker according to claim 1, characterized in that: The bottom end of the vertical portion has an arc-shaped transition portion, and the lead is fixedly connected to the arc-shaped transition portion.

3. The micro-speaker according to claim 1, characterized in that: The yoke is provided with a clearance groove for evading the lead wire.

4. The micro-speaker according to claim 1, characterized in that: The number of the leads is two, and the two leads are axially symmetrical or centrally symmetrical.

5. The micro-speaker according to claim 1, characterized in that: The skeleton is axisymmetric or centrosymmetric.

6. The micro-speaker according to claim 1, characterized in that: The fixing platform is provided with a via hole and also includes an electrical conduction structure, the electrical conduction structure passes through the via hole and is electrically connected to the lead wire, and a partial area of ​​the electrical conduction structure is exposed outside the yoke.

7. The micro-speaker according to claim 6, characterized in that: An insulating rubber block is arranged in the via hole, and the electrical conductive structure is electrically isolated from the yoke iron by the insulating rubber block.

8. The micro-speaker according to claim 1, characterized in that: The central magnetic structure includes an annular central magnetic steel and an annular central washer located above the annular central magnetic steel. The annular central magnetic steel is fixedly connected to the yoke and the annular central washer respectively.

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