Miniature loudspeaker

Abstract

The miniature loudspeaker comprises a basin stand, a magnetic circuit assembly, a diaphragm assembly, a voice coil and a centering disk, the magnetic circuit assembly comprises a yoke, a central magnetic structure and an edge magnetic structure, the central magnetic structure and the edge magnetic structure are respectively arranged on the yoke, the edge magnetic structure is in a ring frame shape and is connected with the basin stand, and the edge magnetic structure is arranged around the central magnetic structure. The central magnetic structure comprises lower magnetic steel, a central washer and upper magnetic steel which are sequentially stacked and connected from bottom to top, and the magnetic pole direction of the lower magnetic steel is opposite to that of the upper magnetic steel; the vibrating diaphragm assembly comprises a voice diaphragm, the voice diaphragm comprises an inner fixing part, an inner folding ring, a connecting part, an outer folding ring and an outer fixing part which are sequentially connected from inside to outside, the outer fixing part is connected with the basin stand, and the inner fixing part is connected with the upper magnetic steel; the voice coil is arranged corresponding to the connecting part and is fixedly connected with the vibrating diaphragm assembly; the centering disk comprises an inner mounting part, a cantilever part and an outer mounting part which are sequentially connected from inside to outside, and the centering disk is positioned on the outer side of the vibrating diaphragm assembly. The miniature loudspeaker is large in magnetic field intensity.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic transducers, and particularly relates to a micro speaker. Background Art

[0002] A centering washer is usually used to support / conduct the voice coil in a micro speaker. Currently, in the industry, the centering washer is generally arranged at the four corners of the micro speaker or on the short axis of the micro speaker, which will undoubtedly occupy part of the space of the magnetic circuit component, resulting in limited dimensions of the edge magnetic structure of the magnetic circuit component and unable to be enlarged, thereby reducing the magnetic field strength of the magnetic circuit component, reducing the BL value, and affecting the acoustic performance of the micro speaker. Summary of the Utility Model

[0003] The technical problem solved by the utility model is to provide a micro speaker with a large magnetic field strength.

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

[0005] A chassis;

[0006] A magnetic circuit component, the magnetic circuit component includes a yoke and a central magnetic structure and an edge magnetic structure respectively arranged on the yoke, the edge magnetic structure is in a ring frame shape and is connected to the chassis, the edge magnetic structure is arranged around the central magnetic structure, the central magnetic structure includes a lower magnetic steel, a central washer and an upper magnetic steel which are stacked and connected in sequence from bottom to top, and the magnetic pole direction of the lower magnetic steel is opposite to the magnetic pole direction of the upper magnetic steel;

[0007] A diaphragm assembly, the diaphragm assembly includes a sound film, the sound film includes an inner fixing part, an inner folding ring, a connecting part, an outer folding ring and an outer fixing part which are connected in sequence from inside to outside, the outer fixing part is connected to the chassis, and the inner fixing part is connected to the upper magnetic steel;

[0008] A voice coil, the voice coil is arranged corresponding to the connecting part and is fixedly connected to the diaphragm assembly;

[0009] A centering washer, the centering washer includes an inner mounting part, a cantilever part and an outer mounting part which are connected in sequence from inside to outside, the centering washer is located outside the diaphragm assembly, the inner mounting part is fixedly connected to the connecting part, and the outer mounting part is fixedly connected to the outer fixing part;

[0010] A first through hole is arranged on the diaphragm assembly, the first through hole is arranged corresponding to the voice coil, and the lead of the voice coil is electrically connected to the centering washer through the first through hole.

[0011] In one embodiment, the number of the first through holes is multiple, and the multiple first through holes are uniformly distributed on the diaphragm assembly.

[0012] In one embodiment, the diaphragm assembly further includes an annular dome, which is located between the connecting portion and the voice coil, and the annular dome is respectively connected to the connecting portion and the voice coil.

[0013] In one embodiment, the first through hole includes a first hole provided on the connecting portion and a second hole provided on the annular dome, and the first hole corresponds to and communicates with the second hole.

[0014] In one embodiment, a conducting member is provided on the chassis, one end of the conducting member is electrically connected to the centering washer, and the other end of the conducting member is exposed at the bottom of the chassis to form an exposed pad.

[0015] In one embodiment, a second through hole is provided on the diaphragm assembly, and one end of the conducting member is electrically connected to the outer mounting portion through the second through hole.

[0016] In one embodiment, the conducting member and the chassis are an integrally injection-molded integral structure.

[0017] In one embodiment, the inner fixing portion has a hollow convex portion protruding away from the yoke, and a partial area of the upper magnet is located within the hollow convex portion.

[0018] In one embodiment, the upper magnet includes a lower magnet and an upper magnet, the upper magnet is located above the lower magnet, the lower magnet is respectively connected to the upper magnet and the central washer, the upper magnet is located within the hollow convex portion and is fixedly connected to at least a partial area of the inner surface of the hollow convex portion, and the edge of the inner fixing portion is connected to the top surface of the lower magnet.

[0019] In one embodiment, the upper magnet and the lower magnet are an integrally processed integral structure, or the upper magnet and the lower magnet are adhesively connected.

[0020] The beneficial effects of the present utility model are as follows: The structure of this micro-speaker is novel. The centering washer is arranged above the sound film, so that the edge magnetic structure can adopt an annular magnetic circuit, increasing the total volume of the magnetic circuit assembly, which is beneficial to improving the magnetic field strength of the magnetic circuit assembly, increasing the BL value of the magnetic circuit assembly, and further improving the performance of the micro-speaker. Moreover, the central magnetic structure has an anti-magnetic design and is fixedly connected to the inner fixing portion of the sound film and the upper magnet. Without increasing the thickness of the micro-speaker, the magnetic field strength of the magnetic circuit assembly is further improved, making the micro-speaker have better performance. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0022] Figure 1 Structural schematic diagram of the overall structure of the micro speaker according to Embodiment 1 of the present invention;

[0023] Figure 2 Structural schematic diagram of the micro speaker after hiding the yoke according to Embodiment 1 of the present invention;

[0024] Figure 3 Cross-sectional view of the micro speaker according to Embodiment 1 of the present invention;

[0025] Figure 4 Structural schematic diagram of a partial structure of the micro speaker according to Embodiment 1 of the present invention.

[0026] Explanation of the reference numerals of the attached drawings:

[0027] 1, chassis;

[0028] 2, magnetic circuit assembly; 21, yoke; 22, central magnetic structure; 221, lower magnet; 222, central washer; 223, lower magnet; 224, upper magnet; 23, side magnetic structure;

[0029] 3, diaphragm assembly; 31, inner fixing part; 32, inner folding ring; 33, connecting part; 34, outer folding ring; 35, outer fixing part; 36, first through hole; 37, second through hole; 38, annular dome;

[0030] 4, voice coil;

[0031] 5, centering washer; 51, inner mounting part; 52, cantilever part; 53, outer mounting part;

[0032] 6, exposed pad. Detailed implementation manners

[0033] The realization of the purpose, functional features and advantages of the present invention will be further described with reference to the embodiments and the attached drawings.

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0035] It should be noted that if there are directional indications such as up, down, left, right, front, back,... in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture as shown in the drawings. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features.

[0037] In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "and / or" as an example, it includes the solution, or the solution, or the solution that satisfies both simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] Embodiment 1

[0040] Please refer to Figures 1 to 4, Embodiment 1 of the present utility model is: A micro speaker, comprising a chassis 1, a magnetic circuit assembly 2, a diaphragm assembly 3, a voice coil 4 and a centering washer 5. The magnetic circuit assembly 2 includes a yoke 21, a central magnetic structure 22 and a side magnetic structure 23 respectively arranged on the yoke 21. The side magnetic structure 23 is in a ring frame shape and is connected to the chassis 1. The side magnetic structure 23 is arranged around the central magnetic structure 22. The side magnetic structure 23 includes a ring-shaped side magnet and a ring-shaped washer. In this embodiment, the ring-shaped side magnet is connected to the yoke 21, the chassis 1 and the ring-shaped washer, and the ring-shaped washer is fixedly connected to the chassis 1;

[0041] The central magnetic structure 22 includes a lower magnet 221, a central washer 222 and an upper magnet which are stacked and connected in sequence from bottom to top. The magnetic pole direction of the lower magnet 221 is opposite to that of the upper magnet. That is to say, when the top of the lower magnet 221 is the N pole, the bottom of the upper magnet is the N pole; when the top of the lower magnet 221 is the S pole, the bottom of the upper magnet is the S pole;

[0042] The diaphragm assembly 3 includes a sound film. The sound film includes an inner fixing part 31, an inner folding ring 32, a connecting part 33, an outer folding ring 34 and an outer fixing part 35 which are connected in sequence from inside to outside. The outer fixing part 35 is connected to the chassis 1, and the inner fixing part 31 is connected to the upper magnet; the voice coil 4 is arranged corresponding to the connecting part 33 and is fixedly connected to the diaphragm assembly 3;

[0043] The centering washer 5 includes an inner mounting part 51, a cantilever part 52 and an outer mounting part 53 which are connected in sequence from inside to outside. The centering washer 5 is located outside the diaphragm assembly 3. The inner mounting part 51 is fixedly connected to the connecting part 33, and the outer mounting part 53 is fixedly connected to the outer fixing part 35; a first through hole 36 is provided on the diaphragm assembly 3. The first through hole 36 is arranged corresponding to the voice coil 4. The lead of the voice coil 4 is electrically connected to the centering washer 5 through the first through hole 36. The centering washer 5 can be a flexible printed circuit board.

[0044] Optionally, the inner mounting part 51 and the outer mounting part 53 are respectively in a ring frame shape. This can increase the bonding area between the centering washer 5 and the sound film, so as to make the connection between the centering washer 5 and the sound film more stable.

[0045] To make the center of gravity of the diaphragm assembly 3 more centered, preferably, the number of the first through holes 36 is multiple, and the multiple first through holes 36 are evenly distributed on the diaphragm assembly 3. In this embodiment, the first through holes 36 are arranged at the connecting part 33.

[0046] To improve the rigidity of the diaphragm assembly 3, the diaphragm assembly 3 further includes an annular dome 38. The annular dome 38 is located between the connecting portion 33 and the voice coil 4. The annular dome 38 is respectively connected to the connecting portion 33 and the voice coil 4, that is, the voice coil 4 is indirectly connected to the connecting portion 33 through the annular dome 38.

[0047] In this embodiment, the first via hole 36 includes a first hole provided on the connecting portion 33 and a second hole provided on the annular dome 38. The first hole and the second hole correspond to each other and are communicated. The lead of the voice coil 4 sequentially passes through the second hole and the first hole and is electrically connected to the centering washer 5.

[0048] A conducting member is provided on the speaker frame 1. One end of the conducting member is electrically connected to the centering washer 5, and the other end of the conducting member is exposed at the bottom of the speaker frame 1 to form an exposed pad 6. It is easy to understand that a conductive circuit is provided in the centering washer 5, and the conductive circuit is electrically connected to the voice coil 4 and the conducting member respectively, so that the power supply can be transmitted to the voice coil 4 via the exposed pad 6.

[0049] A second via hole 37 is provided on the diaphragm assembly 3. One end of the conducting member is electrically connected to the outer mounting portion 53 through the second via hole 37. Optionally, the number of the second via holes 37 is multiple, and the multiple second via holes 37 are evenly distributed on the diaphragm assembly 3. In this embodiment, the second via hole 37 is provided on the outer fixing portion 35.

[0050] In one embodiment, the conducting member is snap-connected, bonded or heat-melted to the speaker frame 1. For the convenience of assembly, it is preferably that the conducting member and the speaker frame 1 are an integrally injection-molded integral structure.

[0051] In this embodiment, the inner surround 32 protrudes away from the yoke 21, the outer surround 34 protrudes towards the yoke 21, and the inner fixing portion 31 has a hollow convex bulge protruding away from the yoke 21. A partial area of the upper magnet is located in the hollow convex bulge. In this way, the thickness space of the micro speaker can be more fully utilized, so that the magnetic field strength of the micro speaker can be increased to a greater extent without increasing the overall size.

[0052] Specifically, the upper magnet includes a lower magnet 223 and an upper magnet 224. The upper magnet 224 is located above the lower magnet 223. The lower magnet 223 is respectively connected to the upper magnet 224 and the central washer 222. The upper magnet 224 is located within the hollow convex portion and is fixedly connected to at least a partial region of the inner surface of the hollow convex portion. When looking down at the upper magnet, the outer peripheral wall of the lower magnet 223 protrudes outward relative to the outer peripheral wall of the upper magnet 224. Therefore, the edge region of the top surface of the lower magnet 223 is exposed relative to the upper magnet 224. In this embodiment, the edge of the inner fixing portion 31 is connected to the top surface of the lower magnet 223.

[0053] In some embodiments, the upper magnet 224 and the lower magnet 223 are an integrally formed one-piece structure. In this embodiment, the upper magnet 224 and the lower magnet 223 are adhesively connected.

[0054] To maximize the magnetic field strength of the magnetic circuit assembly 2, in this embodiment, the top edge of the lower magnet 223 has an avoidance area for avoiding the inner folding ring 32, so that at least a partial region of the peripheral wall of the lower magnet 223 is beveled.

[0055] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the description and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A micro speaker, characterized in that: including a chassis; a magnetic circuit assembly including a yoke and a central magnetic structure and side magnetic structures respectively disposed on the yoke, the side magnetic structures being in a ring frame shape and connecting the chassis, the side magnetic structures surrounding the central magnetic structure, the central magnetic structure including a lower magnet, a central washer and an upper magnet stacked and connected in sequence from bottom to top, the magnetic pole direction of the lower magnet being opposite to that of the upper magnet; a diaphragm assembly including a sounding diaphragm, the sounding diaphragm including an inner fixing portion, an inner folding ring, a connecting portion, an outer folding ring and an outer fixing portion connected in sequence from inside to outside, the outer fixing portion connecting the chassis, and the inner fixing portion connecting the upper magnet; a voice coil disposed corresponding to the connecting portion and fixedly connected to the diaphragm assembly; a centering spider including an inner mounting portion, a cantilever portion and an outer mounting portion connected in sequence from inside to outside, the centering spider being located outside the diaphragm assembly, the inner mounting portion being fixedly connected to the connecting portion, and the outer mounting portion being fixedly connected to the outer fixing portion; a first through hole is provided on the diaphragm assembly corresponding to the voice coil, and a lead of the voice coil is electrically connected to the centering spider through the first through hole.

2. The micro speaker according to claim 1, characterized in that: The number of the first through holes is multiple, and the multiple first through holes are evenly distributed on the diaphragm assembly.

3. The micro speaker according to claim 1, characterized in that: The diaphragm assembly further includes an annular dome located between the connecting portion and the voice coil, and the annular dome is respectively connected to the connecting portion and the voice coil.

4. The micro-speaker according to claim 3, wherein: The first through hole includes a first hole provided on the connecting portion and a second hole provided on the annular dome, and the first hole and the second hole are corresponding and communicated.

5. The micro speaker according to claim 1, wherein: A conducting member is provided on the chassis, one end of the conducting member is electrically connected to the centering spider, and the other end of the conducting member is exposed at the bottom of the chassis to form an exposed pad.

6. The micro-speaker according to claim 5, characterized in that: A second through hole is provided on the diaphragm assembly, and one end of the conducting member is electrically connected to the outer mounting portion through the second through hole.

7. The micro-speaker according to claim 5, characterized in that: The conducting member and the chassis are an integrally injection-molded integral structure.

8. The micro speaker according to claim 1, wherein: The inner fixing portion has a hollow convex bulge protruding away from the yoke, and a partial area of the upper magnet is located in the hollow convex bulge.

9. The micro speaker according to claim 8, wherein: The upper magnet includes a lower upper magnet and an upper upper magnet, the upper upper magnet is located above the lower upper magnet, the lower upper magnet is respectively connected to the upper upper magnet and the central washer, the upper upper magnet is located in the hollow convex bulge and fixedly connected to at least a partial area of the inner surface of the hollow convex bulge, and the edge of the inner fixing portion is connected to the top surface of the lower upper magnet.

10. The micro speaker according to claim 9, wherein: The upper upper magnet and the lower upper magnet are an integrally processed integral structure, or the upper upper magnet and the lower upper magnet are adhesively connected.

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