Miniature loudspeaker

Abstract

The miniature loudspeaker comprises a basin stand, a magnetic circuit assembly, a treble vibration assembly, a bass vibration assembly and a conducting piece, the magnetic circuit assembly comprises a yoke, an inner magnetic structure, a central magnetic structure and an edge magnetic structure, the inner 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 annular lower magnetic steel, a central washer and annular upper magnetic steel which are sequentially stacked and connected from bottom to top, the inner magnetic structure is located in a hollow area of the central magnetic structure, and a high-pitch magnetic gap is formed between the inner magnetic structure 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; the bass vibration assembly comprises a bass diaphragm assembly and a bass voice coil which are connected. The miniature loudspeaker is novel in structure, small in number of components, thin in thickness 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 need to design a conduction circuit, which will occupy a 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 micro speaker with good acoustic performance and thin thickness.

[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 an inner magnetic structure, a central magnetic structure and an edge magnetic structure respectively arranged on the yoke. The edge magnetic structure is connected to the chassis. A low-frequency magnetic gap is formed between the central magnetic structure and the edge 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 inner magnetic structure is located in the hollow area of the central magnetic structure. A high-frequency magnetic gap is formed between the inner magnetic structure 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] A conduction member, the inner magnetic structure has a through hole for the conduction member to penetrate. The conduction member has an inner conduction part and an outer conduction part which are electrically connected. The inner conduction part is electrically connected to the high-frequency voice coil, and the yoke has an avoidance window for the outer conduction part to be exposed.

[0010] In one embodiment, a stepped structure is provided at the inner edge of the top of the annular upper magnet, and the outer edge of the high-frequency diaphragm assembly is connected to the stepped structure.

[0011] In one embodiment, the poles of the ends of the annular upper magnet and the annular lower magnet that are close to each other have the same polarity; the polarity of the bottom end of the inner magnetic structure is opposite to the polarity of the bottom end of the annular lower magnet; the polarity of the bottom end of the side magnetic structure is opposite to the polarity of the bottom end of the annular lower magnet.

[0012] In one embodiment, the conducting member is an FPC board. The conducting member includes a first arm, a second arm, and a third arm. The two ends of the first arm are respectively and perpendicularly connected to the second arm, and the end of the second arm away from the first arm is perpendicularly connected to the third arm. The first arm is fixed to the bottom surface of the inner magnetic structure and is located within the clearance window. The second arm passes through the through hole, and the third arm is fixed to the top surface of the inner magnetic structure. The inner conducting portion is provided on the third arm, and the outer conducting portion is provided on the first arm.

[0013] In one embodiment, the thickness of the first arm is less than the thickness of the yoke.

[0014] In one embodiment, the clearance window is cross-shaped. The two sides of the first arm have extension portions that extend outward respectively. Part of the extension portions is fixedly connected to the annular lower magnet, and the outer conducting portion is provided on the extension portions.

[0015] In one embodiment, the inner magnetic structure includes an inner magnet and an inner washer. The bottom surface of the inner magnet is connected to the yoke, and the top surface of the inner magnet is connected to the bottom surface of the inner washer.

[0016] In one embodiment, the inner magnet and the annular lower magnet are an integrally formed structure processed integrally, and the bottom of the inner magnet is connected to the bottom of the annular lower magnet through a connecting portion.

[0017] The beneficial effects of the present utility model are as follows: The structure of this micro speaker is novel, with few components, which is convenient for assembly and manufacturing, and the assembly cost is low. Its high-frequency unit will not protrude excessively, enabling the thickness of the micro speaker to remain relatively thin, making the micro speaker suitable for installation environments with relatively narrow installation spaces, meeting the development trend of the thinning of portable electronic devices; the structure of the conducting member is small and occupies little space, which is beneficial to improving the acoustic performance of the micro speaker. Description of the Drawings

[0018] 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.

[0019] Figure 1 Cross-sectional view of the micro speaker according to Embodiment 1 of the present invention;

[0020] Figure 2 Exploded view of the micro speaker according to Embodiment 1 of the present invention;

[0021] Figure 3 Cross-sectional view of the micro speaker according to Embodiment 2 of the present invention;

[0022] Figure 4 Schematic structural diagram of a partial structure of the micro speaker according to Embodiment 2 of the present invention.

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

[0024] 1. Frame;

[0025] 2. Magnetic circuit assembly; 21. Yoke; 211. Clearance window; 22. Inner magnetic structure; 221. Inner magnet; 222. Inner washer; 23. Central magnetic structure; 231. Ring-shaped lower magnet; 232. Central washer; 233. Ring-shaped upper magnet; 2331. Step structure; 24. Edge magnetic structure; 25. Connection part;

[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 part; 51. First arm; 52. Second arm; 53. Third arm; 54. Extension part. Detailed implementation manners

[0029] The realization of the object, functional features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the drawings.

[0030] 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.

[0031] It should be noted that if there are directional indications in the embodiments of the present utility model, such as up, down, left, right, front, back..., then the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indications will also change accordingly.

[0032] 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 such feature.

[0033] 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.

[0034] In this application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "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.

[0035] Embodiment 1

[0036] Please refer to Figure 1 and Figure 2, Embodiment 1 of the present utility model is: a micro speaker, comprising a chassis 1, a magnetic circuit assembly 2, a high-frequency vibration assembly 3, a low-frequency vibration assembly 4 and a conduction member 5. The magnetic circuit assembly 2 includes a yoke 21, an inner magnetic structure 22, a central magnetic structure 23 and an edge magnetic structure 24 respectively arranged on the yoke 21. The edge magnetic structure 24 is connected to the chassis 1. A low-frequency magnetic gap is formed between the central magnetic structure 23 and the edge magnetic structure 24. The central magnetic structure 23 includes an annular lower magnetic steel 231, a central spacer 232 and an annular upper magnetic steel 233 stacked and connected in sequence from bottom to top. The inner magnetic structure 22 is located in the hollow region of the central magnetic structure 23. A high-frequency magnetic gap is formed between the inner magnetic structure 22 and the central magnetic structure 23;

[0037] 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 magnetic steel 233. The high-frequency voice coil 32 is arranged 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 arranged around the high-frequency diaphragm assembly 31. The low-frequency diaphragm assembly 41 is connected to the annular upper magnetic steel 233 and the chassis 1. The low-frequency voice coil 42 is arranged corresponding to the low-frequency magnetic gap;

[0038] The inner magnetic structure 22 has a through hole for the conduction member 5 to penetrate. The conduction member 5 has an inner conduction part and an outer conduction part which are electrically connected. The inner conduction part is electrically connected to the high-frequency voice coil 32. The yoke 21 has a clearance window 211 for the outer conduction part to be exposed.

[0039] To enable the high-frequency diaphragm assembly 31 to achieve more accurate positioning and installation, a step structure 2331 is provided at the inner edge of the top of the annular upper magnetic steel 233. The outer edge of the high-frequency diaphragm assembly 31 is connected to the step structure 2331. In this embodiment, the high-frequency diaphragm assembly 31 is adhesively fixed on the step surface of the step structure 2331. The sinking of the high-frequency diaphragm assembly 31 can protect the high-frequency diaphragm assembly 31 to a certain extent, reduce the damage probability of the high-frequency diaphragm assembly 31, and at the same time, enable the high-frequency voice coil 32 to better correspond to the central spacer 232.

[0040] One end of the upper annular permanent magnet 233 and the lower annular permanent magnet 231 close to each other have the same magnetic pole polarity. That is, when the bottom end of the upper annular permanent magnet 233 is the N pole, the top end of the lower annular permanent magnet 231 is also the N pole; when the bottom end of the upper annular permanent magnet 233 is the S pole, the top end of the lower annular permanent magnet 231 is also the S pole. The magnetic pole polarity of the bottom end of the inner magnetic structure 22 is opposite to that of the bottom end of the lower annular permanent magnet 231. That is, when the bottom end of the inner magnetic structure 22 is the N pole, the bottom end of the lower annular permanent magnet 231 is the S pole; when the bottom end of the inner magnetic structure 22 is the S pole, the bottom end of the lower annular permanent magnet 231 is the N pole. The magnetic pole polarity of the bottom end of the side magnetic structure 24 is opposite to that of the bottom end of the lower annular permanent magnet 231. That is, when the bottom end of the side magnetic structure 24 is the N pole, the bottom end of the lower annular permanent magnet 231 is the S pole; when the bottom end of the side magnetic structure 24 is the S pole, the bottom end of the lower annular permanent magnet 231 is the N pole.

[0041] The conducting member 5 is an FPC board. The conducting member 5 includes a first arm 51, a second arm 52, and a third arm 53. The two ends of the first arm 51 are respectively and perpendicularly connected to the second arm 52. One end of the second arm 52 far from the first arm 51 is perpendicularly connected to the third arm 53. The first arm 51 is fixed on the bottom surface of the inner magnetic structure 22 and is located within the clearance window 211. The second arm 52 passes through the perforation. The third arm 53 is fixed on the top surface of the inner magnetic structure 22. The inner conducting portion is provided on the third arm 53, and the outer conducting portion is provided on the first arm 51.

[0042] To enable the first arm 51 to be protected to a certain extent, the thickness of the first arm 51 is less than the thickness of the yoke 21.

[0043] In this embodiment, the clearance window 211 is cross-shaped. The two sides of the first arm 51 have extending portions 54 respectively extending outward. A partial area of the extending portion 54 is fixedly connected to the lower annular permanent magnet 231. The outer conducting portion is provided on the extending portion 54. This can enable the first arm 51 to have sufficient area to set the outer conducting portion.

[0044] Specifically, the inner magnetic structure 22 includes an inner permanent magnet 221 and an inner washer 222. The bottom surface of the inner permanent magnet 221 is connected to the yoke 21, and the top surface of the inner permanent magnet 221 is connected to the bottom surface of the inner washer 222.

[0045] Embodiment Two

[0046] Please refer to Figure 3 and Figure 4 , Embodiment Two of the present utility model is a parallel technical solution to Embodiment One. The difference from Embodiment One is as follows:

[0047] The inner permanent magnet 221 and the annular lower permanent magnet 231 are integrally processed into an integral structure, and the bottom of the inner permanent magnet 221 is connected to the bottom of the annular lower permanent magnet 231 through a connecting portion 25.

[0048] In this embodiment, the magnetic pole polarity of the bottom of the inner permanent magnet 221 is opposite to the magnetic pole polarity of the bottom of the annular lower permanent magnet 231. That is, when the bottom of the inner permanent magnet 221 is the S pole, the bottom of the annular lower permanent magnet 231 is the N pole; when the bottom of the inner permanent magnet 221 is the N pole, the bottom of the annular lower permanent magnet 231 is the S pole. During the processing, the above-mentioned integral structure can be made to have two polarities on the same side simultaneously by means of bidirectional magnetization.

[0049] 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 under the inventive concept of the present invention by using the content of the specification and drawings 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. Miniature loudspeaker, characterized in that: Comprising A chassis; A magnetic circuit assembly, the magnetic circuit assembly including a yoke and an inner magnetic structure, a central magnetic structure and an edge magnetic structure respectively arranged on the yoke, the edge magnetic structure connecting the chassis, a bass magnetic gap being formed between the central magnetic structure and the edge magnetic structure, the central magnetic structure including an annular lower magnetic steel, a central washer and an annular upper magnetic steel stacked and connected in sequence from bottom to top, the inner magnetic structure being located in the hollow area of the central magnetic structure, a treble magnetic gap being formed between the inner magnetic structure 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 annular upper magnetic steel, the treble voice coil being arranged 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 annular upper magnetic steel and the chassis, the bass voice coil being arranged corresponding to the bass magnetic gap; A conducting member, the inner magnetic structure having a through hole for the conducting member to penetrate, the conducting member having an inner conducting portion and an outer conducting portion which are electrically connected, the inner conducting portion being electrically connected to the treble voice coil, the yoke having an avoidance window for the outer conducting portion to be exposed; 2. The micro speaker according to claim 1, wherein: A step structure is provided at the inner edge of the top of the annular upper magnetic steel, and the outer edge of the treble diaphragm assembly is connected to the step structure.

3. The micro speaker according to claim 1, wherein: The magnetic poles of the ends of the annular upper magnetic steel and the annular lower magnetic steel close to each other have the same polarity; the magnetic pole polarity of the bottom end of the inner magnetic structure is opposite to the magnetic pole polarity of the bottom end of the annular lower magnetic steel; the magnetic pole polarity of the bottom end of the edge magnetic structure is opposite to the magnetic pole polarity of the bottom end of the annular lower magnetic steel.

4. The micro speaker according to claim 1, characterized in that: The conducting member is an FPC board, the conducting member including a first arm, a second arm and a third arm, the two ends of the first arm being respectively vertically connected with the second arm, the end of the second arm far from the first arm being vertically connected with the third arm, the first arm being fixed on the bottom surface of the inner magnetic structure and located within the avoidance window, the second arm passing through the through hole, the third arm being fixed on the top surface of the inner magnetic structure, the inner conducting portion being arranged on the third arm, and the outer conducting portion being arranged on the first arm.

5. The micro speaker according to claim 4, wherein: The thickness of the first arm is less than the thickness of the yoke.

6. The micro speaker according to claim 4, wherein: The avoidance window is cross-shaped, the two sides of the first arm having extending portions respectively extending outwards, a partial area of the extending portions being fixedly connected to the annular lower magnetic steel, and the outer conducting portion being arranged on the extending portions.

7. The micro speaker according to claim 1, characterized in that: The inner magnetic structure includes an inner magnetic steel and an inner washer, the bottom surface of the inner magnetic steel connecting the yoke, and the top surface of the inner magnetic steel connecting the bottom surface of the inner washer.

8. The micro speaker according to claim 7, wherein: The inner magnetic steel and the annular lower magnetic steel are an integrally formed structure processed integrally, and the bottom of the inner magnetic steel and the bottom of the annular lower magnetic steel are connected by a connecting portion.

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