Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a basin stand, a voice coil, a magnetic circuit assembly and a via hole, and is characterized in that the basin stand is provided with an extension table extending towards the outer side, and the extension table is provided with a first bonding pad and a second bonding pad which are electrically connected; the voice coil comprises a body and a lead which are connected. The magnetic circuit assembly is fixedly connected with the basin frame, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure is provided with a receding groove, the yoke is provided with a fixing table, the fixing table is located in the receding groove, and a part of area of the lead is fixed on the fixing table; and one end, far away from the body, of the lead penetrates out of the bottom surface of the yoke through the hole and is welded on the first bonding pad. The frame is provided with the extension platform, the extension platform is provided with the first bonding pad, the lead of the voice coil penetrates out of the yoke and then is welded with the first bonding pad, and the miniature loudspeaker can be conducted with a power supply through the second bonding pad when the whole electronic equipment is assembled subsequently, so that the miniature loudspeaker is greatly convenient to be electrically connected and conducted; the body can be set to be larger, so that the performance of the miniature loudspeaker is 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] 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 a micro speaker adopts a large amplitude design, the leads of the voice coil must have a sufficient suspension length to avoid wire 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 the side magnets or leads cannot be placed, resulting in the inability to further improve the performance of the micro speaker. If the leads are led out from the inside of the body through the magnetic circuit assembly, the pad cannot be processed, and the micro speaker can only be directly connected to the power supply through the leads, resulting in inconvenience in wiring the entire machine. At the same time, during wiring, the leads are easily pulled and broken. Utility Model Content

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

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

[0006] A basin frame, the basin frame having an extension platform extending outward, and the extension platform is provided with a first soldering pad and a second soldering pad electrically connected;

[0007] A voice coil, the voice coil comprising a body and a lead connected to each other;

[0008] A magnetic circuit assembly, the magnetic circuit assembly is fixedly connected to the basin frame, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure is provided with an air avoidance groove, the yoke is provided with a fixing platform, the fixing platform is located in the air avoidance groove, and a part of the lead wire is fixed on the fixing platform;

[0009] A via hole, wherein the via hole includes a first part and a second part that are connected to each other, the first part is arranged on the fixing platform and connected to the outer surface of the fixing platform, the second part is arranged on the yoke and connected to the bottom surface of the yoke, and the end of the lead wire away from the main body passes through the via hole from the bottom surface of the yoke and is welded to the first pad.

[0010] In one embodiment, a bottom surface of the yoke is provided with a wire groove for accommodating a partial area of ​​the lead wire.

[0011] In one embodiment, a sealant is further included, and the sealant fills the via hole and the wire groove.

[0012] In one embodiment, the depth of the wire groove is greater than or equal to the wire diameter of the lead wire.

[0013] In one embodiment, the welding surface of the first welding pad is arranged higher than the bottom surface of the yoke, and the height difference between the welding surface of the first welding pad and the bottom surface of the yoke is greater than the wire diameter of the lead.

[0014] In one embodiment, a evacuation groove for evading the lead wire is provided on the central magnetic structure, and the evacuation groove is connected to the outer wall of the central magnetic structure and the evacuation groove.

[0015] In one embodiment, the central magnetic structure includes a central magnetic steel and a central washer, the bottom surface of the central magnetic steel is connected to the yoke, the top surface of the central magnetic steel is connected to the central washer, and the avoidance groove includes a first groove provided on the central washer and a second groove provided on the central magnetic steel, the first groove is connected to the top surface of the central washer, and the bottom of the first groove is connected to the top of the second groove.

[0016] In one embodiment, the second groove is connected to the bottom surface of the central magnetic steel, and the avoidance groove further includes a third groove provided on the top surface of the yoke, and the bottom of the second groove is connected to the top of the third groove.

[0017] In one embodiment, a cross-sectional width of a region of the avoidance groove close to the body is smaller than a cross-sectional width of a region of the avoidance groove close to the center of the central magnetic structure.

[0018] In one embodiment, the fixing platform and the yoke are an integrated structure formed by integral processing; or,

[0019] The fixing platform and the yoke are split structures, and the fixing platform and the yoke are connected by gluing, snapping, welding or by fasteners.

[0020] The beneficial effects of the utility model are as follows: the basin frame has an extension platform, on which a first soldering pad is arranged, and the lead of the voice coil passes through the yoke iron and is soldered to the first soldering pad. When the electronic device is subsequently assembled, the micro-speaker can be connected to the power supply through the second soldering pad, which greatly facilitates the power connection and conduction of the micro-speaker, and at the same time, can also reduce the risk of lead breakage during the assembly of the electronic device; the lead of the voice coil is led out from the body and then wound into the body, so that in the micro-speaker with a large amplitude structure, the body of the voice coil can be set larger, and the performance of the micro-speaker can be improved. 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 This is a schematic diagram of the internal structure of the micro-speaker according to the first embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram of the overall structure of the micro-speaker according to the first embodiment of the present utility model (when no sealant is provided);

[0026] Figure 5 This is a schematic diagram of the overall structure of the micro-speaker of the first embodiment of the utility model (after the sealant is provided);

[0027] Figure 6 is a cross-sectional view of a micro-speaker according to Embodiment 2 of the present utility model;

[0028] Figure 7 This is a cross-sectional view of the micro-speaker according to the third embodiment of the present invention.

[0029] Description of Figure Numbers:

[0030] 1. Basin stand; 11. Extension table;

[0031] 2. Diaphragm assembly;

[0032] 3. Voice coil; 31. Body; 32. Lead wire; 321. Bend section;

[0033] 4. Yoke; 41. Fixing platform; 42. Through hole; 43. Wire trough;

[0034] 5. Central magnetic structure; 51. Avoidance slot; 52. Avoidance slot; 53. Central magnetic steel; 54. Central washer;

[0035] 6. Edge magnetic structure; 61. Magnetic steel assembly; 62. Edge washer;

[0036] 71. a first pad; 72. a second pad;

[0037] 8. Sealant;

[0038] 9. Fixing glue. 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 present utility model is: a micro speaker, comprising a basin frame 1, a vibration component and a magnetic circuit component, the basin frame 1 has an extension platform 11 extending outward, and the extension platform 11 is provided with a first solder pad 71 and a second solder pad 72 electrically connected; the vibration component comprises a diaphragm component 2 and a voice coil 3, the diaphragm component 2 connects the basin frame 1 and the voice coil 3, in this embodiment, the diaphragm component 2 comprises a sound membrane and a ball top arranged on the sound membrane, the sound membrane comprises an inner fixing part, a folding ring part and an outer fixing part connected in sequence from the inside to the outside, the outer fixing part is connected to the basin frame 1, and the ball top is connected to the inner fixing part, in other embodiments, the diaphragm component 2 only has the sound membrane but not the ball top, which can be selected and set according to actual needs; the voice coil 3 comprises a connected body 31 and a lead 32, the body 31 The diaphragm assembly 2 is directly or indirectly connected, and the lead 32 is arranged corresponding to the hollow area of ​​the body 31; the magnetic circuit assembly is fixedly connected to the basin frame 1, and the magnetic circuit assembly includes a yoke 4 and a central magnetic structure 5 and a side magnetic structure 6 respectively arranged on the yoke 4, the side magnetic structure 6 is arranged around the central magnetic structure 5, the side magnetic structure 6 is connected to the basin frame 1, and a magnetic gap is formed between the side magnetic structure 6 and the central magnetic structure 5 for the movement of the body 31, the central magnetic structure 5 is provided with an air avoidance groove 51, the yoke 4 is provided with a fixing platform 41, and the fixing platform 41 is located in the air avoidance groove 51, and a part of the lead 32 is fixed on the fixing platform 41. Specifically, a part of the lead 32 is fixed to the fixing platform 41 through a fixing structure, and the fixing structure includes but is not limited to fixing glue 9, buckles, etc.;

[0047] The micro-speaker also includes a via hole 42, which includes a first part and a second part that are connected to each other. The first part is arranged on the fixing platform 41 and connected to the outer surface of the fixing platform 41, and the second part is arranged on the yoke 4 and connected to the bottom surface of the yoke 4. The end of the lead 32 away from the main body 31 passes through the via hole 42 from the bottom surface of the yoke 4 and is welded to the first soldering pad 71.

[0048] The voice coil 3 has at least two leads 32, one lead 32 is used to connect to the positive pole of the power supply, and the other lead 32 is used to connect to the negative pole of the power supply. The multiple leads 32 in the voice coil 3 are axially symmetrical or centrally symmetrical, so that the traction force of the lead 32 on the vibration component is symmetrically balanced, avoiding the vibration component being unbalanced due to the influence of the traction force, thereby causing rolling vibration. The connection between the lead 32 and the body 31 can be located on the short axis side of the body 31, on the long axis side of the body 31, or at the corner of the body 31.

[0049] To facilitate the assembly of the micro speaker, the via hole 42 is preferably connected to the top surface of the fixing platform 41 , that is, the via hole 42 is arranged perpendicular to the yoke 4 , and correspondingly, the fixing structure is arranged on the top surface of the fixing platform 41 .

[0050] In this embodiment, the first solder pad 71 and the second solder pad 72 are located on the same side of the extension platform 11 . In other embodiments, it is also acceptable that the first solder pad 71 and the second solder pad 72 are located on different sides of the extension platform 11 .

[0051] In order to limit the lead wire 32 and improve the production consistency of the micro-speaker, the bottom surface of the yoke 4 is provided with a wire groove 43 for accommodating a partial area of ​​the lead wire 32. As a preferred embodiment, the depth of the wire groove 43 is greater than or equal to the wire diameter of the lead wire 32, so that the lead wire 32 can be fully protected.

[0052] Furthermore, the micro-speaker also includes a sealant 8, and the sealant 8 fills the via hole 42 and the wire groove 43. In this way, while preventing the lead wire 32 from shaking at will, the exposed lead wire 32 can be more comprehensively protected. At the same time, it also prevents foreign matter from entering the interior of the micro-speaker through the via hole 42 to affect the operation of the micro-speaker.

[0053] To avoid the exposure of the lead 32 and the increase in the cross-sectional thickness of the micro-speaker, in this embodiment, the welding surface of the first soldering pad 71 is set higher than the bottom surface of the yoke 4, and the height difference between the welding surface of the first soldering pad 71 and the bottom surface of the yoke 4 is greater than the wire diameter of the lead 32.

[0054] In order to prevent the lead wire 32 from colliding with the central magnetic structure 5 during the vibration of the diaphragm assembly 2, thereby causing abnormal noise, preferably, the central magnetic structure 5 is provided with an avoidance groove 52 for avoiding the lead wire 32, and the avoidance groove 52 is connected to the outer wall of the central magnetic structure 5 and the avoidance groove 51. In other embodiments, the central magnetic structure 5 may not be provided with the avoidance groove 52, in which case the gap between the central magnetic structure 5 and the diaphragm assembly 2 is the activity space of the lead wire 32 in the micro speaker.

[0055] For ease of assembly, the fixing platform 41 and the yoke 4 are integrally formed into an integrated structure, and the specific methods of integral forming include but are not limited to insert injection molding, cutting and stamping molding, etc. Of course, in other embodiments, it is also acceptable that the fixing platform 41 and the yoke 4 are split structures. In this case, the fixing platform 41 and the yoke 4 are connected by adhesive, snap connection, welding or fasteners, and the fasteners are not limited to screws. In this embodiment, the fixing platform 41 is a hollow convex hull structure, and the fixing platform 41 can be formed by stamping.

[0056] The central magnetic structure 5 includes a central magnetic steel 53 and a central washer 54. The bottom surface of the central magnetic steel 53 is connected to the yoke 4, and the top surface of the central magnetic steel 53 is connected to the central washer 54. The avoidance groove 52 includes a first groove provided on the central washer 54 and a second groove provided on the central magnetic steel 53. The first groove is connected to the top surface of the central washer 54, and the bottom of the first groove is connected to the top of the second groove. The second groove may be connected to or not connected to the bottom surface of the central magnetic steel 53. To prevent the lead wire 32 from colliding with the yoke 4, in some embodiments, the second groove is connected to the bottom surface of the central magnetic steel 53. The avoidance groove 52 also includes a third groove provided on the top surface of the yoke 4, and the bottom of the second groove is connected to the top of the third groove.

[0057] The side magnetic structure 6 includes a magnetic steel component 61 and a side washer 62. The magnetic steel component 61 connects the side washer 62 and the yoke 4, and the side washer 62 connects the basin frame 1. In this embodiment, the magnetic steel component 61 is a continuous and complete annular magnetic steel. In other embodiments, the magnetic steel component 61 includes at least two side magnetic steels, and the central magnetic structure 5 is located between at least one group of two side magnetic steels arranged opposite to each other.

[0058] The lead wire 32 has at least one bending section 321, and the bending section 321 is located in the avoidance groove 52. When the diaphragm assembly 2 vibrates, the lead wire 32 will be deformed accordingly. It is easy to understand that the middle area of ​​the lead wire 32 is suspended and does not contact the yoke 4. It should be noted that the number of the bending sections 321 can be one or more, and can be set according to actual needs.

[0059] Preferably, the cross-sectional width of the avoidance groove 52 in an area close to the main body 31 is smaller than the cross-sectional width of the avoidance groove 52 in an area close to the fixing platform 41, and the bending section 321 of the lead 32 is located in an area of ​​the avoidance groove 52 with a larger cross-sectional width. This can effectively reduce the influence of the setting of the avoidance groove 52 on the magnetic field strength of the micro-speaker, which is beneficial to ensuring the performance 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 only difference from the first embodiment is that the fixing platform 41 is a solid convex hull with a through hole 42.

[0062] Embodiment 3

[0063] Please refer to Figure 7 The third embodiment of the present utility model is a parallel technical solution of the first embodiment, and the only difference from the first embodiment is that the fixing platform 41 and the yoke 4 are split structures. In this embodiment, the fixing platform 41 and the yoke 4 are glued together.

[0064] 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 basin frame, the basin frame having an extension platform extending outward, and the extension platform is provided with a first soldering pad and a second soldering pad electrically connected; A voice coil, the voice coil comprising a body and a lead connected to each other; A magnetic circuit assembly, the magnetic circuit assembly is fixedly connected to the basin frame, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure is provided with an air avoidance groove, the yoke is provided with a fixing platform, the fixing platform is located in the air avoidance groove, and a part of the lead wire is fixed on the fixing platform; A via hole, wherein the via hole includes a first part and a second part that are connected to each other, the first part is arranged on the fixing platform and connected to the outer surface of the fixing platform, the second part is arranged on the yoke and connected to the bottom surface of the yoke, and the end of the lead wire away from the main body passes through the via hole from the bottom surface of the yoke and is welded to the first pad.

2. The micro-speaker according to claim 1, characterized in that: The bottom surface of the yoke is provided with a wire groove for accommodating a partial area of ​​the lead wire.

3. The micro-speaker according to claim 2, characterized in that: Also included is a sealant, which fills the via hole and the wire groove.

4. The micro-speaker according to claim 2, characterized in that: The depth of the wire groove is greater than or equal to the wire diameter of the lead wire.

5. The micro-speaker according to claim 1, characterized in that: The welding surface of the first welding pad is arranged higher than the bottom surface of the yoke, and the height difference between the welding surface of the first welding pad and the bottom surface of the yoke is greater than the wire diameter of the lead wire.

6. The micro-speaker according to claim 1, characterized in that: The central magnetic structure is provided with an escape groove for escaping the lead wire, and the escape groove is connected to the outer wall of the central magnetic structure and the escape groove.

7. The micro-speaker according to claim 6, characterized in that: The central magnetic structure includes a central magnetic steel and a central washer, the bottom surface of the central magnetic steel is connected to the yoke, the top surface of the central magnetic steel is connected to the central washer, the avoidance groove includes a first groove provided on the central washer and a second groove provided on the central magnetic steel, the first groove is connected to the top surface of the central washer, and the bottom of the first groove is connected to the top of the second groove.

8. The micro-speaker according to claim 7, characterized in that: The second groove is connected to the bottom surface of the central magnetic steel, and the avoidance groove also includes a third groove arranged on the top surface of the yoke, and the bottom of the second groove is connected to the top of the third groove.

9. The micro-speaker according to claim 6, characterized in that: A cross-sectional width of a region of the avoidance groove close to the body is smaller than a cross-sectional width of a region of the avoidance groove close to the center of the central magnetic structure.

10. The micro-speaker according to claim 1, characterized in that: The fixing platform and the yoke are an integrated structure formed by integral processing; or, The fixing platform and the yoke are split structures, and the fixing platform and the yoke are connected by gluing, snapping, welding or by fasteners.

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