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 (Flexible Printed Circuit), the magnetic circuit assembly comprises yokes and central magnetic structures respectively arranged on the yokes, and each central magnetic structure comprises a lower magnetic steel, a central washer and an annular upper magnetic steel which are sequentially stacked and connected from bottom to top; the central washer is provided with a protruding hollow convex hull, and the hollow convex hull is located in the hollow area of the annular upper magnetic steel. 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 whole conductive FPC is in a [shape. The conductive FPC comprises a first arm, a second arm and a third arm which are connected in sequence. The top of the hollow convex hull and the lower magnetic steel are respectively provided with a through hole for the second arm to penetrate through, the first arm is fixed on the top surface of the hollow convex hull, and the third arm is fixed on the bottom surface of the lower magnetic steel. The miniature loudspeaker is thin in thickness and good in acoustic performance.

Description

Technical Field

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

[0002] The tweeter unit and the woofer 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 tweeter unit and the woofer 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, thus 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 a 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 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 lower magnet, a central washer and an annular upper magnet stacked and connected in sequence from bottom to top. The central washer has a protruding hollow boss, and the hollow boss is located in the hollow area of the annular upper magnet. A treble magnetic gap is formed between the hollow boss and the annular upper magnet;

[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 annular upper magnet, 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 annular upper magnet and the chassis, and the bass voice coil is arranged corresponding to the bass magnetic gap;

[0009] A conductive FPC, the conductive FPC is integrally in a C shape, and the conductive FPC includes a first arm, a second arm and a third arm connected in sequence;

[0010] The top of the hollow convex hull and the lower magnet respectively have perforations through which the second arm passes. The first arm is fixed to the top surface of the hollow convex hull. The first arm has an inner pad for conducting with the tweeter voice coil. The third arm is fixed to the bottom surface of the lower magnet. The third arm has an outer pad that conducts with the inner pad. The yoke has a clearance window for the outer pad to be exposed.

[0011] In one embodiment, the hollow convex hull is a stamping structure formed by stamping.

[0012] In one embodiment, the peripheral wall of the hollow convex hull is a continuous ring frame structure.

[0013] In one embodiment, the peripheral wall of the hollow convex hull has relief grooves disposed opposite to each other.

[0014] In one embodiment, the relief grooves are disposed corresponding to the ends of the hollow convex hull.

[0015] In one embodiment, the perforations on the hollow convex hull are disposed near one end of the hollow convex hull.

[0016] In one embodiment, the central magnetic structure further includes an annular washer disposed on the top of the annular upper magnet.

[0017] In one embodiment, the first arm and the third arm are disposed opposite to each other, and both the first arm and the third arm are perpendicular to the second arm.

[0018] In one embodiment, the third arm is located within the clearance window.

[0019] In one embodiment, the thickness of the third arm is less than the thickness of the yoke.

[0020] The beneficial effects of the present utility model are as follows: The structure of this micro speaker is novel. Its tweeter 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 conductive FPC for conducting the tweeter voice coil in the micro speaker is a single-arm structure. Therefore, only one perforation needs to be provided on the hollow convex hull and the lower magnet, greatly reducing the influence of the setting of the conductive FPC on the magnetic field strength of the magnetic circuit components, and being conducive to improving the acoustic 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 be obtained based on the structures shown in these drawings.

[0022] Figure 1 Cross-sectional view of the micro speaker of the present invention;

[0023] Figure 2 Schematic structural diagram of the central washer in the micro speaker of the first structure of the present invention;

[0024] Figure 3 Schematic structural diagram of the central washer in the micro speaker of the second structure of the present invention.

[0025] Explanation of the reference numerals of the attached drawings:

[0026] 1. Speaker frame;

[0027] 2. Magnetic circuit assembly; 21. Yoke; 211. Clearance window; 22. Central magnetic structure; 221. Lower magnet; 222. Central washer; 2221. Hollow convex; 2222. Machining groove; 223. Ring upper magnet; 224. Ring washer; 23. Edge magnetic structure; 24. Perforation;

[0028] 3. High-frequency vibration assembly; 31. High-frequency diaphragm assembly; 32. High-frequency voice coil;

[0029] 4. Low-frequency vibration assembly; 41. Low-frequency diaphragm assembly; 42. Low-frequency voice coil;

[0030] 5. Conductive FPC; 51. First arm; 52. Second arm; 53. Third arm. Detailed implementation manners

[0031] The realization of the object, functional features and advantages of the present invention will be further described in conjunction with the embodiments with reference to the attached drawings.

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the attached 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.

[0033] 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..., 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.

[0034] In addition, if there are descriptions such as "first" and "second" in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and should not 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.

[0035] In addition, the meaning of "and / or" that appears 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 what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, 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.

[0036] In this application, unless otherwise clearly defined 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 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.

[0037] Embodiment 1

[0038] Please refer to Figures 1 to 3 For Embodiment 1 of the present utility model: As Figure 1 and Figure 2As shown in the figure, a micro speaker includes a chassis 1, a magnetic circuit assembly 2, a tweeter vibration assembly 3, a woofer 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 bass magnetic gap is formed between the central magnetic structure 22 and the side magnetic structure 23. The central magnetic structure 22 includes a lower magnet 221, a central spacer 222 and an annular upper magnet 223 which are stacked and connected in sequence from bottom to top. The central spacer 222 has a protruding hollow boss 2221. The hollow boss 2221 is located in the hollow area of the annular upper magnet 223. A treble magnetic gap is formed between the hollow boss 2221 and the annular upper magnet 223. The side magnetic structure 23 includes a side magnet and a side spacer. The side magnet connects the side spacer and the yoke 21. The side spacer is connected to the chassis 1;

[0039] The tweeter vibration assembly 3 includes a connected tweeter diaphragm assembly 31 and a tweeter voice coil 32. The tweeter diaphragm assembly 31 is connected to the annular upper magnet 223. The tweeter voice coil 32 is arranged corresponding to the treble magnetic gap. The woofer vibration assembly 4 includes a connected woofer diaphragm assembly 41 and a woofer voice coil 42. The woofer diaphragm assembly 41 is arranged around the tweeter diaphragm assembly 31. The woofer diaphragm assembly 41 is connected to the annular upper magnet 223 and the chassis 1. The woofer voice coil 42 is arranged corresponding to the bass magnetic gap. Specifically, the outer edge of the tweeter diaphragm assembly 31 is hermetically bonded to the top surface of the annular upper magnet 223. The inner edge of the woofer diaphragm assembly 41 is hermetically bonded to the top surface of the annular upper magnet 223;

[0040] The conductive FPC 5 is integrally in a C shape. The conductive FPC 5 includes a first arm 51, a second arm 52 and a third arm 53 which are connected in sequence. The top of the hollow boss 2221 and the lower magnet 221 respectively have through holes 24 for the second arm 52 to pass through. The first arm 51 is fixed on the top surface of the hollow boss 2221. The first arm 51 has an inner pad for conducting with the tweeter voice coil 32. The third arm 53 is fixed on the bottom surface of the lower magnet 221. The third arm 53 has an outer pad which is conductive with the inner pad. The yoke 21 has a clearance window 211 for the outer pad to be exposed. In this embodiment, the lead of the tweeter voice coil 32 is welded to the inner pad.

[0041] Specifically, the first arm 51 and the third arm 53 are arranged oppositely. The first arm 51 and the third arm 53 are both perpendicular to the second arm 52. The first arm 51 is fixedly connected to the top surface of the hollow boss 2221. The third arm 53 is fixedly connected to the bottom surface of the lower magnet 221. That is to say, the third arm 53 is located in the clearance window 211.

[0042] To enable a certain degree of protection for the third arm 53, it is preferred that the thickness of the third arm 53 is less than the thickness of the yoke 21.

[0043] As a preferred embodiment, the hollow boss 2221 is a stamping structure formed by stamping. The forming process of the hollow boss 2221 is simple and convenient, which is beneficial to the control of the manufacturing cost of the micro speaker.

[0044] In a structure of a micro speaker according to this embodiment, the peripheral wall of the hollow boss 2221 is a continuous ring frame structure, as Figure 2 shown. In another structure of a micro speaker according to this embodiment, as Figure 3 shown, the peripheral wall of the hollow boss 2221 is provided with material-removing grooves 2222 arranged oppositely. The material-removing grooves 2222 are arranged corresponding to the ends of the hollow boss 2221. The arrangement of the material-removing grooves 2222 can reduce the manufacturing consumables of the central washer 222, which is beneficial to saving material costs. At the same time, it can facilitate the stamping forming of the hollow boss 2221.

[0045] Since the conducting FPC 5 is a single-arm structure, to enable the inner pad to be close to the central area of the top surface of the hollow boss 2221, in this embodiment, the through hole 24 on the hollow boss 2221 is arranged close to one end of the hollow boss 2221.

[0046] To improve the acoustic performance of the micro speaker, in this embodiment, the central magnetic structure 22 further includes an annular washer 224 arranged on the top of the annular upper magnetic steel 223.

[0047] 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 under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. Miniature loudspeaker, characterized in that: including a chassis; 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 chassis, a bass magnetic gap being formed between the central magnetic structure and the side magnetic structures, the central magnetic structure including a lower magnet, a central washer and an annular upper magnet stacked and connected in sequence from bottom to top, the central washer having a protruding hollow boss, the hollow boss being located within a hollow area of the annular upper magnet, a treble magnetic gap being formed between the hollow boss and the annular upper magnet; 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 magnet, 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 magnet and the chassis, the bass voice coil being disposed corresponding to the bass magnetic gap; a conducting FPC, the conducting FPC being integrally in a C shape, the conducting FPC including a first arm, a second arm and a third arm connected in sequence; the top of the hollow boss and the lower magnet respectively have through holes for the second arm to penetrate, the first arm being fixed on the top surface of the hollow boss, the first arm having an inner pad for conducting with the treble voice coil, the third arm being fixed on the bottom surface of the lower magnet, the third arm having an outer pad conducting with the inner pad, the yoke having an avoidance window for the outer pad to be exposed; 2. The micro-speaker according to claim 1, characterized in that: the hollow boss is a stamping structure formed by stamping.

3. The micro speaker according to claim 1, wherein: the peripheral wall of the hollow boss is a continuous ring frame structure.

4. The micro-speaker according to claim 1, characterized in that: the peripheral wall of the hollow boss has relatively arranged material removal grooves.

5. The micro-speaker according to claim 4, characterized in that: the material removal grooves are disposed corresponding to the ends of the hollow boss.

6. The micro speaker according to claim 1, wherein: the through hole on the hollow boss is disposed close to one end of the hollow boss.

7. The micro speaker according to claim 1, wherein: the central magnetic structure further includes an annular washer disposed on the top of the annular upper magnet.

8. The micro-speaker according to claim 1, wherein: the first arm and the third arm are relatively arranged, and both the first arm and the third arm are perpendicular to the second arm.

9. The micro-speaker according to claim 1, characterized in that: the third arm is located within the avoidance window.

10. The micro speaker according to claim 9, characterized in that: the thickness of the third arm is less than the thickness of the yoke.

Images