Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a basin stand, a magnetic circuit assembly, a treble vibration assembly, a bass vibration assembly, additional magnetic steel and a conducting FPC, 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 connected with the basin stand, and a bass magnetic gap is formed between the central magnetic structure and the edge magnetic structure. The central magnetic structure comprises an annular lower magnetic steel, a central washer and an annular upper magnetic steel which are sequentially stacked and connected from bottom to top, the yoke is provided with a hollow convex hull which is arranged in a protruding mode, the hollow convex hull is located in a hollow area of the central magnetic structure, and a high-pitch magnetic gap is formed between the hollow convex hull and the central magnetic structure; the high-pitch vibration assembly comprises a high-pitch vibrating diaphragm assembly and a high-pitch voice coil which are connected, the high-pitch vibrating diaphragm assembly is connected with the annular upper magnetic steel, and the high-pitch voice coil is arranged corresponding to the high-pitch magnetic gap; and the additional magnetic steel is arranged in the hollow area of the hollow convex hull. The miniature loudspeaker is simple and novel in structure and good in acoustic performance.

Description

Technical Field

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

[0002] The high-frequency unit and the low-frequency unit of a coaxial micro speaker each include an independent vibration system and a magnetic circuit system, with a complex structure. The overall height of the coaxial micro speaker composed of the high-frequency unit and the low-frequency unit coaxially increases, resulting in inconvenient installation due to excessive height and reducing the applicability of the product. In addition, all coaxial micro speakers require a conduction circuit to be designed, and the conduction circuit will occupy a relatively large space, thereby restricting the improvement of the acoustic performance of the coaxial micro speaker. Summary of the Utility Model

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

[0004] 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 assembly, the magnetic circuit assembly includes a yoke and a central magnetic structure and a side magnetic structure respectively arranged on the yoke. The side magnetic structure is connected to the chassis. A low-frequency magnetic gap is formed between the central magnetic structure and the side magnetic structure. The central magnetic structure includes a ring-shaped lower magnetic steel, a central washer and a ring-shaped upper magnetic steel stacked and connected in sequence from bottom to top. The yoke has a convex hollow protrusion, and the hollow protrusion is located in the hollow area of the central magnetic structure. A high-frequency magnetic gap is formed between the hollow protrusion and the central magnetic structure;

[0007] A high-frequency vibration assembly, the high-frequency vibration assembly includes a connected high-frequency diaphragm assembly and a high-frequency voice coil. The high-frequency diaphragm assembly is connected to the ring-shaped upper magnetic steel, and the high-frequency voice coil is arranged corresponding to the high-frequency magnetic gap;

[0008] A low-frequency vibration assembly, the low-frequency vibration assembly includes a connected low-frequency diaphragm assembly and a low-frequency voice coil. The low-frequency diaphragm assembly is arranged around the high-frequency diaphragm assembly. The low-frequency diaphragm assembly is connected to the ring-shaped upper magnetic steel and the chassis, and the low-frequency voice coil is arranged corresponding to the low-frequency magnetic gap;

[0009] An additional magnetic steel, which is arranged in the hollow area of the hollow protrusion;

[0010] Connect the FPC. The conductive FPC includes a first arm, a second arm, and a third arm connected in sequence. The first arm is disposed on the bottom surface of the additional magnet. The top plate of the hollow convex hull and the additional magnet both have through holes for the second arm to pass through. The third arm is disposed on the top surface of the top plate of the hollow convex hull. The third arm has an inner pad electrically connected to the tweeter voice coil. The first arm has an outer pad electrically connected to the inner pad.

[0011] In one embodiment, the outer peripheral wall of the additional magnet contacts the inner peripheral wall of the hollow convex hull.

[0012] In one embodiment, the top surface of the additional magnet contacts the bottom surface of the top plate of the hollow convex hull.

[0013] In one embodiment, the bottom surface of the additional magnet is disposed higher than the bottom surface of the yoke.

[0014] In one embodiment, the magnetic pole polarities of the ends of the annular upper magnet and the annular lower magnet that are close to each other are the same.

[0015] In one embodiment, the magnetic pole polarity of the bottom end of the annular lower magnet is the same as the magnetic pole polarity of the top end of the additional magnet.

[0016] In one embodiment, the top plate of the hollow convex hull is aligned with the central washer.

[0017] In one embodiment, the lead of the tweeter voice coil is welded and conducted to the inner pad.

[0018] In one embodiment, a stepped structure is provided on the inner edge of the top of the annular upper magnet, and the outer edge of the tweeter diaphragm assembly is connected to the stepped structure.

[0019] In one embodiment, a relief slope is provided on the outer edge of the top of the annular upper magnet.

[0020] The beneficial effects of the present utility model are as follows: The structure of this micro speaker is simple and novel, with few components, which is convenient for assembly and manufacturing, and the assembly cost is low. Its tweeter unit will not protrude excessively, so that the thickness of the micro speaker can be kept relatively thin, enabling the micro speaker to be applicable to installation environments with relatively narrow installation spaces, meeting the development trend of the thinning of portable electronic devices; the conductive component is small and compact, occupying little space, which is beneficial to improving the acoustic performance of the micro speaker; in addition, setting an additional magnet in the hollow convex hull on the yoke can greatly improve the magnetic field strength of the micro speaker, thereby enhancing the performance of the micro speaker. 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 also be obtained based on the structures shown in these drawings.

[0022] Figure 1 It is a cross-sectional view of the micro speaker according to the first embodiment of the present invention.

[0023] Explanation of the reference numerals in the drawings:

[0024] 1. Basin frame;

[0025] 2. Magnetic circuit assembly; 21. Yoke; 211. Hollow convex hull; 212. Top plate; 22. Central magnetic structure; 221. Ring-shaped lower magnet; 222. Central washer; 223. Ring-shaped upper magnet; 2231. Step structure; 2232. Avoidance inclined plane; 23. Edge magnetic structure;

[0026] 3. High-frequency vibration assembly; 31. High-frequency diaphragm assembly; 32. High-frequency voice coil;

[0027] 4. Low-frequency vibration assembly; 41. Low-frequency diaphragm assembly; 42. Low-frequency voice coil;

[0028] 5. Conductive FPC; 51. First arm; 52. Second arm; 53. Third arm;

[0029] 6. Additional magnet. Detailed implementation manners

[0030] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the drawings.

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0032] It should be noted that if there are directional indications such as up, down, left, right, front, back... in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between the components in a specific posture as shown in the drawings. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if the description in the embodiments of the present utility model involves "first", "second", etc., the description of "first", "second", etc. is only for descriptive purposes and should not be construed as indicating or implying its relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0034] 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 scope of protection required by the present utility model.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", "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 communication inside 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.

[0036] Embodiment 1

[0037] Please refer to Figure 1 , Embodiment 1 of the present utility model is: a micro speaker, including a chassis 1, a magnetic circuit assembly 2, a high-frequency vibration assembly 3, a low-frequency vibration assembly 4, an additional magnet 6, and a conductive FPC 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 connected to the chassis 1. The side magnetic structure 23 includes a side washer and a side magnet connecting the side washer and the yoke 21, and the side washer is connected to the chassis 1. A low-frequency magnetic gap is formed between the central magnetic structure 22 and the side magnetic structure 23. The central magnetic structure 22 includes a ring-shaped lower magnet 221, a central washer 222 and a ring-shaped upper magnet 223 stacked and connected in sequence from bottom to top. The yoke 21 has a convex hollow protrusion 211, and the hollow protrusion 211 is located in the hollow area of the central magnetic structure 22. A high-frequency magnetic gap is formed between the hollow protrusion 211 and the central magnetic structure 22;

[0038] One end of the annular upper magnet 223 and the annular lower magnet 221 that are close to each other have the same magnetic pole polarity. That is, when the magnetic pole at the bottom end of the annular upper magnet 223 is the N pole, the magnetic pole at the top end of the annular lower magnet 221 is the N pole; when the magnetic pole at the bottom end of the annular upper magnet 223 is the S pole, the magnetic pole at the top end of the annular lower magnet 221 is the S pole. The magnetic pole polarity at the bottom end of the side magnet is opposite to the magnetic pole polarity at the bottom end of the annular lower magnet 221. That is, when the magnetic pole at the bottom end of the side magnet is the N pole, the magnetic pole at the bottom end of the annular lower magnet 221 is the S pole; when the magnetic pole at the bottom end of the side magnet is the S pole, the magnetic pole at the bottom end of the annular lower magnet 221 is the N pole.

[0039] The high - frequency vibration assembly 3 includes a connected high - frequency diaphragm assembly 31 and a high - frequency voice coil 32. The high - frequency diaphragm assembly 31 is connected to the annular upper magnet 223, and the high - frequency voice coil 32 is disposed corresponding to the high - frequency magnetic gap. The low - frequency vibration assembly 4 includes a connected low - frequency diaphragm assembly 41 and a low - frequency voice coil 42. The low - frequency diaphragm assembly 41 is disposed around the high - frequency diaphragm assembly 31. The low - frequency diaphragm assembly 41 is connected to the annular upper magnet 223 and the chassis 1, and the low - frequency voice coil 42 is disposed corresponding to the low - frequency magnetic gap.

[0040] The additional magnet 6 is disposed in the hollow region of the hollow convex hull 211, and the magnetic pole polarity at the bottom end of the annular lower magnet 221 is the same as the magnetic pole polarity at the top end of the additional magnet 6.

[0041] The conductive FPC 5 includes a first arm 51, a second arm 52, and a third arm 53 connected in sequence. The first arm 51 is disposed on the bottom surface of the additional magnet 6. Both the top plate 212 of the hollow convex hull 211 and the additional magnet 6 have through - holes for the second arm 52 to pass through. The third arm 53 is disposed on the top surface of the top plate 212 of the hollow convex hull 211. The third arm 53 has an inner pad electrically connected to the high - frequency voice coil 32, and the first arm 51 has an outer pad electrically connected to the inner pad. Specifically, the lead of the high - frequency voice coil 32 is welded and conducted to the inner pad.

[0042] The outer peripheral wall of the additional magnet 6 is in contact with the inner peripheral wall of the hollow convex hull 211; and / or, the top surface of the additional magnet 6 is in contact with the bottom surface of the top plate 212 of the hollow convex hull 211. Preferably, the additional magnet 6 is adhesively connected to the inner surface of the hollow convex hull 211.

[0043] The bottom surface of the additional magnet 6 is disposed higher than the bottom surface of the yoke 21, so as to leave a setting space for the first arm 51, enabling the yoke 21 to play a role in protecting the outer pad to a certain extent.

[0044] As a preferred embodiment, the top plate 212 of the hollow convex hull 211 is aligned with the central washer 222, so that the high-frequency voice coil 32 can better cut the magnetic induction lines, thereby improving the high-frequency performance of the micro speaker.

[0045] To enable the high-frequency diaphragm assembly 31 to be positioned and installed more precisely, a stepped structure 2231 is provided on the inner edge of the top of the annular upper magnet 223, and the outer edge of the high-frequency diaphragm assembly 31 is connected to the stepped structure 2231. In this embodiment, the high-frequency diaphragm assembly 31 is adhesively fixed to the stepped surface of the stepped structure 2231. The sinking of the high-frequency diaphragm assembly 31 can protect the high-frequency diaphragm assembly 31 to a certain extent, reduce the probability of damage to the high-frequency diaphragm assembly 31, and at the same time, enable the high-frequency voice coil 32 to better correspond to the central washer 222.

[0046] An avoidance inclined surface 2232 is provided on the outer edge of the top of the annular upper magnet 223. The setting of the avoidance inclined surface 2232 can prevent the bass vibration assembly 4 from colliding with the outer edge of the top of the annular upper magnet 223 during operation and generating noise.

[0047] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. Micro speaker, characterized in that: Comprising a basin frame; a magnetic circuit assembly, the magnetic circuit assembly including a yoke and a central magnetic structure and side magnetic structures respectively disposed on the yoke, the side magnetic structures connecting the basin frame, a bass magnetic gap being formed between the central magnetic structure and the side magnetic structures, the central magnetic structure including a ring-shaped lower magnetic steel, a central washer and a ring-shaped upper magnetic steel stacked and connected in sequence from bottom to top, the yoke having a convex hollow boss, the hollow boss being located in the hollow region of the central magnetic structure, a treble magnetic gap being formed between the hollow boss and the central magnetic structure; a treble vibration assembly, the treble vibration assembly including a connected treble diaphragm assembly and a treble voice coil, the treble diaphragm assembly connecting the ring-shaped upper magnetic steel, the treble voice coil being disposed corresponding to the treble magnetic gap; a bass vibration assembly, the bass vibration assembly including a connected bass diaphragm assembly and a bass voice coil, the bass diaphragm assembly surrounding the treble diaphragm assembly, the bass diaphragm assembly connecting the ring-shaped upper magnetic steel and the basin frame, the bass voice coil being disposed corresponding to the bass magnetic gap; an additional magnetic steel, the additional magnetic steel being disposed in the hollow region of the hollow boss; a conductive FPC, the conductive FPC including a first arm, a second arm and a third arm connected in sequence, the first arm being disposed on the bottom surface of the additional magnetic steel, the top plate of the hollow boss and the additional magnetic steel both having through holes for the second arm to pass through, the third arm being disposed on the top surface of the top plate of the hollow boss, the third arm having an inner pad electrically connected to the treble voice coil, the first arm having an outer pad electrically connected to the inner pad.

2. The micro-speaker according to claim 1, wherein: The outer peripheral wall of the additional magnetic steel contacts the inner peripheral wall of the hollow boss.

3. The micro speaker according to claim 1, wherein: The top surface of the additional magnetic steel contacts the bottom surface of the top plate of the hollow boss.

4. The micro speaker according to claim 1, wherein: The bottom surface of the additional magnetic steel is disposed higher than the bottom surface of the yoke.

5. The micro speaker according to claim 1, wherein: The magnetic pole polarities of the ends of the ring-shaped upper magnetic steel and the ring-shaped lower magnetic steel that are close to each other are the same.

6. The micro speaker according to claim 1, wherein: The magnetic pole polarity of the bottom end of the ring-shaped lower magnetic steel is the same as the magnetic pole polarity of the top end of the additional magnetic steel.

7. The micro speaker according to claim 1, characterized in that: The top plate of the hollow boss is aligned with the central washer.

8. The micro-speaker according to claim 1, characterized in that: The lead of the treble voice coil is welded and conducted with the inner pad.

9. The micro speaker according to claim 1, wherein: A step structure is provided at the inner edge of the top of the ring-shaped upper magnetic steel, and the outer edge of the treble diaphragm assembly is connected to the step structure.

10. The micro speaker according to claim 1, characterized in that: An avoidance inclined surface is provided at the outer edge of the top of the ring-shaped upper magnetic steel.

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