Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a magnetic circuit assembly, a vibration assembly and a deformable conduction structure, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure is integrally in a ring frame shape, the yoke is provided with a fixed table, and the fixed table is positioned in a hollow area of the central magnetic structure; the vibration assembly comprises a vibrating diaphragm, a ball top and a voice coil, the ball top is connected with the vibrating diaphragm and the voice coil, and the ball top is provided with a boss extending into the hollow area of the central magnetic structure; the deformable conduction structure is arranged corresponding to the hollow area of the central magnetic structure, the deformable conduction structure is provided with at least one bending section used for providing deformation allowance, the deformable conduction structure is electrically connected with the voice coil, and the deformable conduction structure is fixedly connected with the bottom end of the boss and the fixed table. And the bent section is correspondingly positioned between the boss and the fixed table. The miniature loudspeaker is novel in structure and good in acoustic 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 order to improve the performance of micro speakers, existing micro speakers mostly use large voice coils and large amplitude structure designs. Currently, the leads of the voice coils are generally wrapped around the outside of the voice coils. When the voice coils are enlarged, there is insufficient space on the outside of the voice coils, making it impossible to place side magnets (or reduce the size of the side magnets) or conduct centering supports, resulting in the inability to further improve performance. Utility Model Content

[0003] The technical problem solved by the utility model is to provide a high-performance large-amplitude micro-speaker.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a micro speaker, comprising:

[0005] 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;

[0006] A vibration assembly, the vibration assembly comprising a diaphragm, a dome and a voice coil, the dome being connected to the diaphragm and the voice coil respectively, the dome having a boss extending into a hollow area of ​​the central magnetic structure;

[0007] A deformable conductive structure, wherein the deformable conductive structure is arranged corresponding to the hollow area of ​​the central magnetic structure, the deformable conductive structure has at least one bending section for providing a deformation margin, the deformable conductive structure is electrically connected to the voice coil, the variable conductive structure is respectively fixedly connected to the bottom end of the boss and the fixed platform, and the bending section is correspondingly located between the boss and the fixed platform.

[0008] In one embodiment, the voice coil includes a body and a lead that are connected to each other, the top of the body is connected to the ball top, and the lead is the deformable conductive structure.

[0009] In one embodiment, the lead is fixedly connected to the ball top.

[0010] In one embodiment, the lead is fixedly connected to the outer side surface of the boss.

[0011] In one embodiment, the deformable conductive structure is a conductive centering support.

[0012] In one embodiment, the conductive centering support plate includes an outer fixing portion, a cantilever portion and an inner fixing portion connected in sequence, the inner fixing portion is fixed to the fixing platform, the outer fixing portion includes a first fixing portion and a second fixing portion connected vertically, the first fixing portion is connected to the cantilever portion and fixedly connected to the outer side surface of the boss, the second fixing portion is located below the ball top and connected to the ball top, the second fixing portion is provided with a first soldering pad electrically connected to the voice coil, and the inner fixing portion is provided with a second soldering pad electrically connected to the first soldering pad.

[0013] In one embodiment, the cantilever portion has a connecting end portion, the cantilever portion is connected to the first fixing portion via the connecting end portion, the connecting end portion is perpendicular to the first fixing portion, and the connecting end portion is fixedly connected to the bottom end of the boss.

[0014] In one embodiment, the number of the deformable conductive structures is two, and the two deformable conductive structures are symmetrical or center-symmetrical.

[0015] 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 deformable conductive structure, and a partial area of ​​the electrical conductive structure is exposed outside the yoke.

[0016] 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.

[0017] The beneficial effects of the utility model are:

[0018] The micro speaker has a novel structure. The micro speaker can adopt a large voice coil and a large amplitude design architecture at the same time. The conductive component used to conduct electricity for the voice coil is located inside the central magnetic structure, which will not affect the maximization of the voice coil; the deformable conductive structure 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, the overall volume of the side magnetic structure can be set larger, thereby further improving the acoustic performance of the micro speaker.

[0019] 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.

[0020] There are many specific types of deformable conductive structures to choose from, which is conducive to enriching the diversity of micro speakers. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 An exploded view of the micro speaker of the first embodiment of the utility model;

[0023] Figure 2 is a cross-sectional view of the micro-speaker of the first embodiment of the utility model;

[0024] Figure 3 The internal structure of the micro speaker of the first embodiment of the utility model is shown in FIG. Figure 1 ;

[0025] Figure 4 The internal structure of the micro speaker of the first embodiment of the utility model is shown in FIG. Figure 2 ;

[0026] Figure 5 A cross-sectional view of a micro-speaker of another structure according to the first embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram of the internal structure of a micro speaker according to the second embodiment of the present utility model.

[0028] Description of Figure Numbers:

[0029] 1. Basin stand;

[0030] 2. Yoke iron; 21. Fixed platform;

[0031] 3. Center magnetic structure; 31. Ring-shaped center magnetic steel; 32. Ring-shaped center washer; 33. Avoidance groove;

[0032] 4. Diaphragm;

[0033] 5. Ball top; 51. Boss;

[0034] 6. Voice coil; 61. Body; 62. Lead wire;

[0035] 7. Ring-shaped edge magnetic steel;

[0036] 8. Conductive centering support; 81. External fixing portion; 811. First fixing portion; 812. Second fixing portion; 82. Cantilever portion; 83. Internal fixing portion; 84. Connecting end portion;

[0037] 9. Electrically conductive structure;

[0038] 10. Insulating rubber block. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Embodiment 1

[0046] Please refer to Figures 1 to 5 , Embodiment 1 of the utility model is: a micro speaker, comprising a basin frame 1, a magnetic circuit component, a vibration component and a deformable conductive structure, wherein the magnetic circuit component and the vibration component are respectively fixedly connected to the basin frame 1, the magnetic circuit component comprises a yoke 2 and a central magnetic structure 3 and a side magnetic structure respectively arranged on the yoke 2, a magnetic gap is formed between the central magnetic structure 3 and the side magnetic structure for the movement of the voice coil 6, 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 component comprises a diaphragm 4, a dome 5 and a voice coil 6, the ball top 5 is respectively connected to the diaphragm 4 and the voice coil 6, the ball top 5 has a boss 51 extending into the hollow area of ​​the central magnetic structure 3; the deformable conductive structure is arranged corresponding to the hollow area of ​​the central magnetic structure 3, the deformable conductive structure has at least one bending section for providing a deformation margin, the deformable conductive structure is electrically connected to the voice coil 6, the variable conductive structure is respectively fixedly connected to the bottom end of the boss 51 and the fixed platform 21, the bending section is correspondingly located between the boss 51 and the fixed platform 21, and the bending section is located in the hollow area of ​​the central magnetic structure 3.

[0047] As a preferred embodiment, the edge magnetic structure includes an annular edge magnetic steel 7 and an annular washer, the annular washer connects the annular edge magnetic steel 7 and the basin frame 1, and the annular edge magnetic steel 7 connects the yoke 2, so that the magnetic field of the micro speaker can be enhanced to a greater extent. Of course, in other embodiments, it is also possible for the edge magnetic structure to include at least two long strips of edge magnetic steels. In this case, the central magnetic structure 3 is located between the two oppositely arranged edge magnetic steels. In addition, in a specific product, the edge magnetic structure can also be replaced by a flange formed by bending the edge of the yoke 2.

[0048] In this embodiment, the deformable conductive structure is a conductive centering support plate 8, which is an elastic supporting structure with an electrical conductive function. The voice coil 6 includes a connected body 61 and a lead 62, the top of the body 61 is connected to the ball top 5, and the lead 62 is electrically conductive with the deformable conductive structure.

[0049] In detail, the conductive centering support plate 8 includes an outer fixing portion 81, a cantilever portion 82 and an inner fixing portion 83 which are connected in sequence, the inner fixing portion 83 is fixed on the fixing platform 21, the outer fixing portion 81 includes a first fixing portion 811 and a second fixing portion 812 which are vertically connected, the first fixing portion 811 is connected to the cantilever portion 82 and is fixedly connected to the outer side surface of the boss 51, the second fixing portion 812 is located below the ball top 5 and connected to the ball top 5, the second fixing portion 812 is provided with a first soldering pad electrically connected to the voice coil 6, the inner fixing portion 83 is provided with a second soldering pad electrically connected to the first soldering pad, and an external power supply supplies power to the voice coil 6 through the second soldering pad.

[0050] Furthermore, the cantilever portion 82 has a connecting end portion 84, the cantilever portion 82 is connected to the first fixing portion 811 via the connecting end portion 84, the connecting end portion 84 is perpendicular to the first fixing portion 811, and the connecting end portion 84 is fixedly connected to the bottom end of the boss 51. In this way, the bonding force between the conductive centering support 8 and the ball top 5 can be effectively improved, and the risk of separation between the two can be reduced.

[0051] It is easy to understand that in other embodiments, the conductive centering support piece 8 can be a flat plate structure as a whole, which can facilitate the processing and manufacturing of the conductive centering support piece 8. At this time, the external fixing portion 81 is fixedly connected to the bottom end of the boss 51, and the lead 62 is fixedly connected to both the ball top 5 and the outer side surface of the boss 51.

[0052] 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. The annular central magnetic steel 31 connects the annular central washer 32 and the yoke 2. In order to avoid the vibration component colliding with the central magnetic structure 3 and generating noise when the micro speaker is working, preferably, the inner edge of the top of the central magnetic structure 3 has an avoidance groove 33 for avoiding the connection area between the lead 62 and the first pad. The avoidance groove 33 can be a pressed groove provided on the annular central washer 32, or a step groove formed at the connection between the annular central washer 32 and the annular central magnetic steel 31. If necessary, a part of the avoidance groove 33 can also be located on the annular central magnetic steel 31, that is, at this time, the avoidance groove 33 extends downward to the annular central magnetic steel 31.

[0053] There are two deformable conductive structures, and the two deformable conductive structures are symmetrical or center-symmetrical. In this way, the traction force of the deformable conductive structure on the vibration component can be symmetrically balanced, avoiding the imbalance of the vibration component due to the influence of the traction force, thereby causing rolling vibration.

[0054] The fixing platform 21 is provided with a via hole, and the micro speaker also includes an electrical conductive structure 9, which passes through the via hole and is electrically connected to the second pad, and a partial area of ​​the electrical conductive structure 9 is exposed from the yoke 2. The electrical conductive structure 9 can be an electric wire, a metal conductive structure, etc., and an external power supply supplies power to the voice coil 6 via the second pad through the electrical conductive structure 9.

[0055] Furthermore, an insulating rubber block 10 is provided in the via hole, and the electrically conductive structure 9 is electrically isolated from the yoke 2 by the insulating rubber block 10. When the electrically conductive structure 9 is a metal conductive structural part, the electrically conductive structure 9 and the insulating rubber block 10 are preferably an integrated structure of insert injection molding.

[0056] 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 10 itself can be identified as the fixing platform 21.

[0057] The boss 51 may be a hollow structure (such as Figure 2 As shown), it can also be a solid structure (such as Figure 5 Specific settings can be made according to actual needs.

[0058] The dome 5 can be a single-layer structure or a multi-layer composite structure.

[0059] Optionally, the yoke 2 is provided with an escape groove for avoiding the deformable conductive structure, so as to avoid the deformable conductive structure and the yoke 2 from colliding during the operation of the micro speaker.

[0060] Embodiment 2

[0061] Please refer to Figure 6 The second embodiment of the present invention is a parallel technical solution of the first embodiment, and the difference from the first embodiment is that the lead wire 62 of the voice coil 6 itself is a deformable conductive structure, that is, the micro speaker of this embodiment does not have the conductive centering support plate 8 of the first embodiment.

[0062] It is not difficult to understand that in this embodiment, the lead 62 of the voice coil 6 is relatively long, so it is necessary to fix a local area of ​​the lead 62 to avoid the lead 62 colliding with the magnetic circuit component when the micro speaker is working. In this embodiment, the lead 62 is fixedly connected to at least one of the outer side surface of the boss 51 and the ball top 5. Preferably, the lead 62 is fixedly connected to the outer side surface of the boss 51 and the ball top 5 at the same time, such as by gluing.

[0063] 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, a dome and a voice coil, the dome being connected to the diaphragm and the voice coil respectively, the dome having a boss extending into a hollow area of ​​the central magnetic structure; A deformable conductive structure, wherein the deformable conductive structure is arranged corresponding to the hollow area of ​​the central magnetic structure, the deformable conductive structure has at least one bending section for providing a deformation margin, the deformable conductive structure is electrically connected to the voice coil, the deformable conductive structure is respectively fixedly connected to the bottom end of the boss and the fixed platform, and the bending section is correspondingly located between the boss and the fixed platform.

2. The micro-speaker according to claim 1, characterized in that: The voice coil comprises a body and a lead which are connected to each other. The top of the body is connected to the ball top, and the lead is the deformable conductive structure.

3. The micro-speaker according to claim 2, characterized in that: The lead wire is fixedly connected to the ball top.

4. The micro-speaker according to claim 2, characterized in that: The lead is fixedly connected to the outer side surface of the boss.

5. The micro-speaker according to claim 1, characterized in that: The deformable conductive structure is a conductive centering support piece.

6. The micro-speaker according to claim 5, characterized in that: The conductive centering support plate includes an outer fixing portion, a cantilever portion and an inner fixing portion connected in sequence, the inner fixing portion is fixed to the fixing platform, the outer fixing portion includes a first fixing portion and a second fixing portion connected vertically, the first fixing portion is connected to the cantilever portion and fixedly connected to the outer side surface of the boss, the second fixing portion is located below the ball top and connected to the ball top, the second fixing portion is provided with a first soldering pad electrically connected to the voice coil, and the inner fixing portion is provided with a second soldering pad electrically connected to the first soldering pad.

7. The micro-speaker according to claim 6, characterized in that: The cantilever portion has a connecting end portion, the cantilever portion is connected to the first fixing portion via the connecting end portion, the connecting end portion is perpendicular to the first fixing portion, and the connecting end portion is fixedly connected to the bottom end of the boss.

8. The micro-speaker according to claim 1, characterized in that: The number of the deformable conductive structures is two, and the two deformable conductive structures are symmetrical or center-symmetrical.

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

10. The micro-speaker according to claim 9, 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.

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