Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a magnetic circuit assembly, a voice coil and a conduction centering disk, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure is provided with an avoiding groove, two ends of the avoiding groove are respectively communicated with the outer wall surface of the central magnetic structure, the yoke is provided with a fixed table, and the fixed table is positioned in the avoiding groove; the conducting centering disk is arranged corresponding to the avoiding groove, the conducting centering disk is connected with the voice coil and the fixing table, the conducting centering disk is provided with a conducting circuit, an outer bonding pad and an inner bonding pad, the outer bonding pad and the inner bonding pad are electrically connected with the conducting circuit, the outer bonding pad is electrically connected with the voice coil, and the inner bonding pad is arranged close to the fixing table. The miniature loudspeaker is novel in structure, a large voice coil and a large-amplitude design framework can be adopted by the miniature loudspeaker at the same time, the voice coil can be enlarged, meanwhile, the conduction centering disk can have enough suspension length, and therefore the acoustic performance of the miniature loudspeaker can be effectively 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 order to improve the performance of micro speakers, existing micro speakers mostly adopt large voice coils and large amplitude structure designs. Some micro speakers are provided with conductive centering supports, which have the functions of conducting the voice coil and the external power supply and correcting the voice coil to improve the rolling vibration of the voice coil. In the prior art, the conductive centering supports are generally located on the outside of the voice coil. When the micro speaker adopts a large amplitude design, the conductive centering supports must have sufficient suspended length to avoid stress concentration and wire breakage. However, in micro speakers with a large voice coil structure, insufficient space is left on the outside of the voice coil, and thus it is impossible to place side magnets or conductive centering supports, resulting in the inability to further improve the 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 provided with an avoidance groove, the two ends of the avoidance groove being respectively connected to the outer wall surface of the central magnetic structure, the yoke being provided with a fixing platform, and the fixing platform being located in the avoidance groove;

[0006] a voice coil, the voice coil being arranged corresponding to the central magnetic structure;

[0007] A conductive centering support plate is provided corresponding to the avoidance groove, the conductive centering support plate connects the voice coil and the fixed platform, the conductive centering support plate has a conductive circuit and an outer solder pad and an inner solder pad electrically connected to the conductive circuit respectively, the outer solder pad is electrically connected to the voice coil, and the inner solder pad is provided close to the fixed platform.

[0008] In one embodiment, the conductive centering support plate includes an inner mounting portion, a cantilever portion, and an outer mounting portion which are connected in sequence, the inner mounting portion is fixed on the fixing platform, the outer mounting portion is connected to the voice coil, the outer solder pad is located on the outer mounting portion, and the inner solder pad is located on the inner mounting portion.

[0009] In one embodiment, the cantilever portion has a plurality of bending segments.

[0010] In one embodiment, the fixing platform is provided with a via hole and further includes an electrical conductive structure, wherein the electrical conductive structure passes through the via hole and is electrically connected to the inner pad, and a partial area of ​​the electrical conductive structure is exposed outside the yoke.

[0011] In one embodiment, the electrically conductive structure is a wire or a metal conductive member.

[0012] In one embodiment, the number of the conductive centering arms is two, and the two conductive centering arms are axially symmetrical or centrally symmetrical.

[0013] In one embodiment, the connection point between the conductive centering support and the voice coil is located at the long axis side, short axis side or corner of the voice coil.

[0014] In one embodiment, the yoke is provided with a clearance groove for avoiding the conduction centering support plate.

[0015] In one embodiment, a cross-sectional width of a region of the avoidance groove close to the voice coil is smaller than a cross-sectional width of a region of the avoidance groove close to the fixing platform.

[0016] The beneficial effects of the utility model are as follows: the micro speaker has a novel structure, and the micro speaker can simultaneously adopt a large voice coil and a large amplitude design architecture, so that the voice coil can be maximized, and the conductive centering support can also have a sufficient suspension 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 conductive centering support, the overall volume of the side magnetic structure can be set larger, thereby further improving the acoustic performance of the micro speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 An exploded view of a micro-speaker of the first structure of the first embodiment of the utility model;

[0019] Figure 2 A schematic diagram of the internal structure of a micro-speaker of a first structure of Embodiment 1 of the present utility model;

[0020] Figure 3 A cross-sectional view of a micro-speaker of a first structure of Embodiment 1 of the present utility model;

[0021] Figure 4A schematic diagram of the internal structure of a micro-speaker of the second structure of the first embodiment of the utility model;

[0022] Figure 5 A schematic diagram of the internal structure of a micro-speaker of the third structure of the first embodiment of the utility model;

[0023] Figure 6 This is a schematic diagram of the internal structure of a micro speaker according to Embodiment 2 of the present utility model;

[0024] Figure 7 This is a cross-sectional view of the micro-speaker according to the third embodiment of the present invention.

[0025] Description of Figure Numbers:

[0026] 1. Basin stand;

[0027] 2. Diaphragm assembly;

[0028] 3. Voice coil;

[0029] 4. yoke; 41. fixing platform; 411. through hole; 42. air avoidance groove;

[0030] 5. Central magnetic structure; 51. Avoidance slot;

[0031] 6. Edge magnetic structure;

[0032] 7. Conductive centering support piece; 71. Inner mounting portion; 72. Cantilever portion; 73. Outer mounting portion;

[0033] 8. Electrically conductive structure. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Embodiment 1

[0041] Please refer to Figures 1 to 5 , Embodiment 1 of the present utility model is: Please combine Figures 1 to 3, a micro speaker, comprising a basin frame 1, a vibration component magnetic circuit component and a conductive centering support plate 7, the vibration component comprising a diaphragm component 2 and a voice coil 3, the diaphragm component 2 connecting the basin frame 1 and the voice coil 3, in this embodiment, the diaphragm component 2 comprises a sound membrane and a dome provided on the sound membrane, in other embodiments, the diaphragm component 2 only has the sound membrane without the dome, and the specific setting can be selected according to actual needs; the magnetic circuit component comprises a yoke 4 and a central magnetic structure 5 and a side magnetic structure 6 respectively provided on the yoke 4, the central magnetic structure 5 is provided with an avoidance groove 51, the two ends of the avoidance groove 51 are respectively connected to the outer wall surface of the central magnetic structure 5, the yoke 4 A fixed platform 41 is provided on it, and the fixed platform 41 is located in the avoidance groove 51. The side magnetic structure 6 is arranged around the central magnetic structure 5, and the side magnetic structure 6 is connected to the basin frame 1. A magnetic gap is formed between the side magnetic structure 6 and the central magnetic structure 5 for the voice coil 3 to move. In other words, the voice coil 3 is arranged corresponding to the central magnetic structure 5; the conductive centering support plate 7 is arranged corresponding to the avoidance groove 51, and the conductive centering support plate 7 connects the voice coil 3 and the fixed platform 41. The conductive centering support plate 7 has a conductive circuit and an outer solder pad and an inner solder pad electrically connected to the conductive circuit respectively, the outer solder pad is electrically connected to the voice coil 3, and the inner solder pad is arranged close to the fixed platform 41.

[0042] The conductive centering support plate 7 includes an inner mounting portion 71, a cantilever portion 72 and an outer mounting portion 73 which are connected in sequence, the inner mounting portion 71 is fixed on the fixing platform 41, the outer mounting portion 73 is connected to the voice coil 3, the outer solder pad is located on the outer mounting portion 73, and the inner solder pad is located on the inner mounting portion 71.

[0043] The cantilever portion 72 needs to vibrate up and down with the voice coil 3 to provide deformation. Therefore, the cantilever portion 72 has a plurality of bending sections. It is easy to understand that the shape trend of the cantilever portion 72 of the conductive centering support piece 7 can be set according to actual use requirements, so the specific styles of the cantilever portion 72 are various, such as Figure 2 , Figure 4 and Figure 5 shown.

[0044] Optionally, the cross-sectional width of the avoidance groove 51 near the voice coil 3 is smaller than the cross-sectional width of the avoidance groove 51 near the fixing platform 41, and the bending section of the cantilever portion 72 is located in the area with the larger cross-sectional width of the avoidance groove 51, thereby effectively reducing the influence of the setting of the avoidance groove 51 on the magnetic field strength of the micro-speaker.

[0045] There are two conductive centering supports 7, and the two conductive centering supports 7 are axially symmetrical or centrally symmetrical, so that the traction force of the conductive centering supports 7 on the vibration component is symmetrically balanced, avoiding the imbalance of the vibration component due to the influence of the traction force, and then causing rolling vibration.

[0046] The connection between the conductive centering support plate 7 and the voice coil 3 is located at the long axis side, short axis side or corner of the voice coil 3, and can be specifically set according to actual needs. In this embodiment, the connection between the conductive centering support plate 7 and the voice coil 3 is located at the short axis side of the voice coil 3.

[0047] In order to fully avoid the conductive centering support plate 7, in this embodiment, the avoidance groove 51 is connected to the top and bottom surfaces of the central magnetic structure 5. Specifically, the central magnetic structure 5 includes a central magnetic steel and a central washer located above the central magnetic steel, the central magnetic steel connects the central washer and the yoke 4, and the avoidance groove 51 extends from the top surface of the central washer to the direction close to the yoke 4. The avoidance groove 51 is connected to the bottom surface of the central magnetic structure 5, which means that the avoidance groove 51 is connected to the bottom surface of the central magnetic steel. However, in some products, it is also possible that the avoidance groove 51 is not connected to the bottom surface of the central magnetic steel. In this case, the assembly of the central magnetic steel and the yoke 4 can be facilitated.

[0048] The edge magnetic structure 6 includes an edge magnetic steel and an edge washer located above the edge magnetic steel, the edge magnetic steel connects the edge washer and the yoke 4, and the edge washer connects the basin frame 1. In other embodiments, the edge magnetic structure 6 can also be replaced by a flange formed by bending the edge area of ​​the yoke 4.

[0049] Optionally, a via hole 411 is provided on the fixing platform 41, and the micro speaker also includes an electrically conductive structure 8, which passes through the via hole 411 and is electrically connected to the inner pad, and a partial area of ​​the electrically conductive structure 8 is exposed from the yoke 4, and the electrically conductive structure 8 is a wire, a metal conductive part or other conductive structure.

[0050] 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 formed by stamping a part of the yoke 4.

[0051] Embodiment 2

[0052] Please refer to Figure 6The second embodiment of the present invention is a parallel technical solution of the first embodiment, and is different from the first embodiment in that the connection between the conductive centering support plate 7 and the voice coil 3 is located at the corner of the voice coil 3.

[0053] Embodiment 3

[0054] Please refer to Figure 7 Embodiment 3 of the present invention is a parallel technical solution of embodiment 1, and is different from embodiment 1 in that: an air avoidance groove 42 for avoiding the conduction centering support plate 7 is provided on the yoke 4, and the air avoidance groove 42 can be either a blind groove or a through groove. The existence of the air avoidance groove 42 can increase the distance between the conduction centering support plate 7 and the yoke 4, thereby avoiding the conduction centering support plate 7 and the yoke 4 from colliding during the operation of the micro-speaker, which is beneficial to improving the reliability margin of the micro-speaker.

[0055] 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 provided with an avoidance groove, the two ends of the avoidance groove being respectively connected to the outer wall surface of the central magnetic structure, the yoke being provided with a fixing platform, and the fixing platform being located in the avoidance groove; a voice coil, the voice coil being arranged corresponding to the central magnetic structure; A conductive centering support plate is provided corresponding to the avoidance groove, the conductive centering support plate connects the voice coil and the fixed platform, the conductive centering support plate has a conductive circuit and an outer solder pad and an inner solder pad electrically connected to the conductive circuit respectively, the outer solder pad is electrically connected to the voice coil, and the inner solder pad is provided close to the fixed platform.

2. The micro-speaker according to claim 1, characterized in that: The conductive centering support plate includes an inner mounting portion, a cantilever portion and an outer mounting portion which are connected in sequence, the inner mounting portion is fixed on the fixing platform, the outer mounting portion is connected to the voice coil, the outer pad is located on the outer mounting portion, and the inner pad is located on the inner mounting portion.

3. The micro-speaker according to claim 2, characterized in that: The cantilever portion has a plurality of bending sections.

4. 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 inner pad, and a partial area of ​​the electrical conductive structure is exposed outside the yoke.

5. The micro-speaker according to claim 4, characterized in that: The electrical conductive structure is a wire or a metal conductive member.

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

7. The micro-speaker according to claim 1, characterized in that: The connection point between the conductive centering support and the voice coil is located at the long axis side, short axis side or corner of the voice coil.

8. The micro-speaker according to claim 1, characterized in that: The yoke is provided with a clearance groove for avoiding the conduction centering support piece.

9. The micro-speaker according to claim 1, characterized in that: A cross-sectional width of a region of the avoidance groove close to the voice coil is smaller than a cross-sectional width of a region of the avoidance groove close to the fixing platform.

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