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 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; the bass vibration assembly comprises a bass vibrating diaphragm assembly and a bass voice coil which are connected, and the bass vibrating diaphragm assembly is arranged around the treble vibrating diaphragm assembly. The miniature loudspeaker is simple and novel in structure and thin in thickness.

Description

Technical Field

[0001] The utility model relates to the technical field of electro-acoustic transducers, and particularly relates 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. The structure is complex, and 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. Summary of the Utility Model

[0003] The technical problem solved by the utility model is to provide a micro speaker with a simple structure and a thin thickness.

[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 assembly, the magnetic circuit assembly includes a yoke and a central magnetic structure and an edge magnetic structure respectively arranged on the yoke. The edge magnetic structure is connected to the chassis. A bass 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 yoke has a convex hollow boss, and the hollow boss is located in the hollow area of the central magnetic structure. A treble magnetic gap is formed between the hollow boss and the central magnetic structure;

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

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

[0009] A conductive FPC, the conductive FPC includes a first arm, a second arm and a third arm connected in sequence. The first arm is arranged on the bottom surface of the top plate of the hollow boss. The top plate of the hollow boss has a perforation for the second arm to pass through. The third arm is arranged on the top surface of the top plate of the hollow boss. The third arm has an inner pad electrically connected to the treble voice coil, and the first arm has an outer pad electrically connected to the inner pad.

[0010] In an embodiment, the top plate of the hollow boss is aligned with the central washer.

[0011] In one embodiment, the lead wire of the tweeter voice coil is welded and electrically connected to the inner pad.

[0012] In one embodiment, a step 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 step structure.

[0013] In one embodiment, an avoidance inclined surface is provided on the outer edge of the top of the annular upper magnet.

[0014] In one embodiment, the hollow convex hull has ventilation holes, and the ventilation holes communicate the internal space of the hollow convex hull with the tweeter magnetic gap.

[0015] 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.

[0016] The beneficial effects of the present utility model are as follows: The structure of this micro speaker is simple and novel, with fewer 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 thin and light of portable electronic devices; the conduction component has a small and compact structure, occupies less space, and is conducive to improving the acoustic performance of the micro speaker; in addition, the setting of the hollow convex hull on the yoke is also conducive to the heat dissipation of the micro speaker, ensuring that the micro speaker can work stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. 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.

[0018] Figure 1 It is a cross-sectional view of the micro speaker according to the first embodiment of the present utility model.

[0019] Explanation of the reference numerals in the drawings:

[0020] 1, chassis;

[0021] 2, magnetic circuit assembly; 21, yoke; 211, hollow convex hull; 212, top plate; 22, central magnetic structure; 221, annular lower magnet; 222, central washer; 223, annular upper magnet; 2231, step structure; 2232, avoidance inclined surface; 23, side magnetic structure;

[0022] 3. High-frequency vibration component; 31. High-frequency diaphragm component; 32. High-frequency voice coil;

[0023] 4. Low-frequency vibration component; 41. Low-frequency diaphragm component; 42. Low-frequency voice coil;

[0024] 5. Conductive FPC; 51. First arm; 52. Second arm; 53. Third arm. Detailed implementation manners

[0025] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings.

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to 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 of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] 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 position relationship and movement conditions between components in a specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, if there are descriptions involving "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.

[0029] 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 the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. 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 protection scope required by the present utility model.

[0030] In this application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "linked", "fixed", etc. shall 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.

[0031] Embodiment 1

[0032] 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, 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. 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 magnetic steel 221, a central washer 222 and a ring-shaped upper magnetic steel 223 stacked and connected in sequence from bottom to top. The yoke 21 has a convex hollow boss 211. The hollow boss 211 is located in the hollow area of the central magnetic structure 22. A high-frequency magnetic gap is formed between the hollow boss 211 and the central magnetic structure 22;

[0033] The magnetic pole polarities of the ends of the ring-shaped upper magnetic steel 223 and the ring-shaped lower magnetic steel 221 close to each other are the same, that is, when the bottom end of the ring-shaped upper magnetic steel 223 is an N pole, the top end of the ring-shaped lower magnetic steel 221 is also an N pole; when the bottom end of the ring-shaped upper magnetic steel 223 is an S pole, the top end of the ring-shaped lower magnetic steel 221 is also an S pole;

[0034] 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 ring-shaped upper magnetic steel 223. 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 ring-shaped upper magnetic steel 223 and the chassis 1. The low-frequency voice coil 42 is arranged corresponding to the low-frequency magnetic gap;

[0035] 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 top plate 212 of the hollow convex hull 211. The top plate 212 of the hollow convex hull 211 has a perforation 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. Specifically, the lead of the high - frequency voice coil 32 is welded and conducted to the inner pad; the first arm 51 has an outer pad electrically connected to the inner pad. In order to balance the center of gravity of the micro - speaker, in this embodiment, the two ends of the first arm 51 are respectively vertically connected to the second arm 52, and one end of the second arm 52 away from the first arm 51 is vertically connected to the third arm 53.

[0036] As a preferred embodiment, the top plate 212 of the hollow convex hull 211 is aligned with the central washer 222, which can enable the high - frequency voice coil 32 to better cut the magnetic induction lines, thereby improving the high - frequency performance of the micro - speaker.

[0037] In order to enable the high - frequency diaphragm assembly 31 to be positioned and installed more accurately, a step structure 2231 is provided on the inner edge of the top of the annular upper magnet 223. The outer edge of the high - frequency diaphragm assembly 31 is connected to the step structure 2231. In this embodiment, the high - frequency diaphragm assembly 31 is adhesively fixed to the step surface of the step structure 2231. The sinking of the high - frequency diaphragm assembly 31 can provide a certain degree of protection for the high - frequency diaphragm assembly 31, 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.

[0038] 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.

[0039] As a preferred embodiment, the hollow convex hull 211 has a ventilation hole (not shown in the figure). The ventilation hole communicates the internal space of the hollow convex hull 211 with the high - frequency magnetic gap. The existence of the hollow convex hull 211 not only facilitates the heat dissipation of the micro - speaker, but also the internal space of the hollow convex hull 211 can be used as the rear cavity of the high - frequency sound - generating unit, so that the micro - speaker has a built - in high - frequency rear cavity, thereby reducing the space occupied by the micro - speaker in the electronic device carrying it.

[0040] The above are only alternative embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present utility model.

Claims

1. Micro-speaker, characterized in that: including a speaker 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 to the speaker frame, a bass magnetic gap being formed between the central magnetic structure and the side magnetic structures, 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 yoke having a convex hollow protrusion located within a hollow region of the central magnetic structure, a treble magnetic gap being formed between the hollow protrusion 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 to the annular 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 annular upper magnetic steel and the speaker frame, the bass voice coil being disposed corresponding to the bass magnetic gap; 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 a bottom surface of a top plate of the hollow protrusion, the top plate of the hollow protrusion having a through hole for the second arm to pass through, the third arm being disposed on a top surface of the top plate of the hollow protrusion, 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 top plate of the hollow protrusion is aligned with the central washer.

3. 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.

4. The micro speaker according to claim 1, wherein: A step structure is provided at an inner edge of a top of the annular upper magnetic steel, and an outer edge of the treble diaphragm assembly is connected to the step structure.

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

6. The micro speaker according to claim 1, characterized in that: The hollow protrusion has a vent hole, and the vent hole communicates an internal space of the hollow protrusion with the treble magnetic gap.

7. The micro-speaker according to claim 1, wherein: The magnetic pole polarities of one ends of the annular upper magnetic steel and the annular lower magnetic steel close to each other are the same.

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