Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a frame, a vibration assembly and a magnetic circuit assembly, the vibration assembly comprises a diaphragm assembly, an inner voice coil and an outer voice coil, the inner voice coil and the outer voice coil are coaxially arranged, and the diaphragm assembly is respectively connected with the frame, the inner voice coil and the outer voice coil; 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, an outer magnetic gap for the movement of the outer voice coil is formed between the central magnetic structure and the edge magnetic structure, the central magnetic structure is in a ring frame shape, and the yoke is provided with a window communicated with a hollow area of the central magnetic structure. The edge of the open window is provided with a turnup which is bent and extends into the hollow area of the central magnetic structure, and an inner magnetic gap for the movement of the inner voice coil is formed between the turnup and the central magnetic structure. The miniature loudspeaker is small in size and can realize large loudness.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic converters, in particular to a miniature loudspeaker. Background Art

[0002] With the popularity of mobile devices such as smartphones, the market demand for micro speakers continues to increase. As mobile devices become thinner and lighter, the installation space left for micro speakers in mobile devices is getting smaller and smaller. This has led to the reduction in the volume of the micro speaker's magnetic circuit components and the size of the voice coil. As a result, the driving force of the micro speaker is insufficient and the loudness is difficult to meet user needs. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a miniature loudspeaker with high loudness.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a micro speaker, comprising:

[0005] basin rack;

[0006] A vibration assembly, comprising a diaphragm assembly and a coaxially arranged inner voice coil and outer voice coil, wherein the diaphragm assembly is connected to the basin frame, the inner voice coil and the outer voice coil respectively;

[0007] A magnetic circuit assembly, comprising a yoke and a central magnetic structure and a side magnetic structure respectively arranged on the yoke, an external magnetic gap for movement of the outer voice coil being formed between the central magnetic structure and the side magnetic structures, the central magnetic structure being in the shape of a ring frame, a window being provided on the yoke for connecting to the hollow area of ​​the central magnetic structure, the edge of the window having a flange that bends and extends into the hollow area of ​​the central magnetic structure, an internal magnetic gap for movement of the inner voice coil being formed between the flange and the central magnetic structure.

[0008] Furthermore, the flanges are respectively provided on two opposite sides of the window.

[0009] Furthermore, the top end surface of the flange is arranged to be higher than, lower than or flush with the top surface of the central magnetic structure.

[0010] Furthermore, it also includes a shaping support piece, and the shaping support pieces are respectively provided at both ends of the magnetic circuit assembly. The shaping support piece includes an inner mounting portion, a deformation portion and an outer mounting portion connected in sequence. The inner mounting portion is fixedly connected to the diaphragm assembly, and the outer mounting portion is fixedly connected to the basin frame. The inner mounting portion is provided with an inner soldering pad, and the outer mounting portion is provided with an outer soldering pad electrically connected to the inner soldering pad. The inner soldering pad of one of the shaping support pieces is electrically connected to the inner voice coil, and the inner soldering pad of the other shaping support piece is electrically connected to the outer voice coil.

[0011] Furthermore, the yoke includes a body and an insert, the body is provided with a mounting opening, the insert is arranged at the mounting opening, and the window and the flange are arranged on the insert.

[0012] Furthermore, the insert is bonded, clamped or welded to the body.

[0013] Furthermore, the magnetic permeability of the insert is greater than or equal to the magnetic permeability of the yoke.

[0014] Furthermore, the insert includes a flat plate portion, the window is provided on the flat plate portion, and the flange is connected to the flat plate portion.

[0015] Furthermore, the bottom surface of the body has a positioning groove for positioning the flat plate portion.

[0016] Furthermore, the depth of the positioning groove is greater than or equal to the thickness of the flat plate portion.

[0017] The beneficial effects of the present invention are:

[0018] The micro speaker has a novel structure and comprises two coaxially arranged voice coils, which can generate a greater driving force and thus improve the loudness of the micro speaker.

[0019] The presence of the flange on the yoke allows for a complete magnetic circuit to be constructed for the inner voice coil when the space inside the inner voice coil is insufficient to accommodate the magnet. This provides the inner voice coil with a stronger driving force, thereby significantly increasing the loudness of the micro-speaker. Consequently, the overall volume of the micro-speaker can be made smaller, making it particularly suitable for applications with limited installation environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a micro-speaker according to the first embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of the micro-speaker according to the first embodiment of the present invention;

[0022] Figure 3 This is a schematic structural diagram of a micro-speaker according to a second embodiment of the present invention;

[0023] Figure 4 This is a cross-sectional view of a micro-speaker according to the second embodiment of the present invention.

[0024] Description of labels:

[0025] 1. Basin rack;

[0026] 2. Diaphragm assembly;

[0027] 3. Inner voice coil;

[0028] 4. External voice coil;

[0029] 5. Yoke; 51. Window; 52. Flanging; 53. Main body; 531. Positioning groove; 54. Insert;

[0030] 6. Central magnetic structure;

[0031] 7. Edge magnetic structure;

[0032] 8. Shape the support piece. DETAILED DESCRIPTION

[0033] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

[0034] Please refer to Figures 1 to 4 , micro speakers, including:

[0035] Basin rack 1;

[0036] A vibration assembly, comprising a diaphragm assembly 2 and a coaxially arranged inner voice coil 3 and outer voice coil 4, wherein the diaphragm assembly 2 is connected to the basin frame 1, the inner voice coil 3 and the outer voice coil 4 respectively;

[0037] A magnetic circuit assembly includes a yoke 5 and a central magnetic structure 6 and a side magnetic structure 7 respectively arranged on the yoke 5, an external magnetic gap for the movement of the outer voice coil 4 is formed between the central magnetic structure 6 and the side magnetic structure 7, the central magnetic structure 6 is in the shape of a ring frame, and a window 51 is provided on the yoke 5 to connect to the hollow area of ​​the central magnetic structure 6, the edge of the window 51 has a flange 52 that is bent and extends into the hollow area of ​​the central magnetic structure 6, and an internal magnetic gap for the movement of the inner voice coil 3 is formed between the flange 52 and the central magnetic structure 6.

[0038] As can be seen from the foregoing description, the beneficial effects of the present invention are: the novel microspeaker structure, with two coaxially arranged voice coils, can generate a greater driving force, thereby improving the loudness of the microspeaker. The presence of the upper flange 52 of the yoke 5 allows for a complete magnetic circuit to be constructed for the inner voice coil 3 when the space inside the inner voice coil 3 is insufficient for the magnet, thereby providing the inner voice coil 3 with a stronger driving force, thereby significantly improving the loudness of the microspeaker. As a result, the overall volume of the microspeaker can be made smaller, making it particularly suitable for applications with limited installation environments.

[0039] Furthermore, the flanges 52 are respectively provided on two opposite sides of the window 51 .

[0040] As can be seen from the above description, the flanges 52 provided on opposite sides of the window 51 can allow the inner voice coil 3 to be subjected to a more balanced magnetic force.

[0041] Furthermore, the top end surface of the flange 52 is arranged to be higher than, lower than, or flush with the top surface of the central magnetic structure 6 .

[0042] It can be seen from the above description that the height of the flange 52 can be selectively set according to actual needs.

[0043] Furthermore, it also includes a shaping support piece 8, and the shaping support pieces 8 are respectively provided at both ends of the magnetic circuit assembly. The shaping support piece 8 includes an inner mounting portion, a deformation portion and an outer mounting portion connected in sequence. The inner mounting portion is fixedly connected to the diaphragm assembly 2, and the outer mounting portion is fixedly connected to the basin frame 1. The inner mounting portion is provided with an inner soldering pad, and the outer mounting portion is provided with an outer soldering pad electrically connected to the inner soldering pad. The inner soldering pad of one of the shaping support pieces 8 is electrically connected to the inner voice coil 3, and the inner soldering pad of the other shaping support piece 8 is electrically connected to the outer voice coil 4.

[0044] From the above description, it can be seen that the inner voice coil 3 and the outer voice coil 4 are powered by different shaped supports 8, so that the external power supply can provide different voltages to the inner voice coil 3 and the outer voice coil 4 to adjust the driving force.

[0045] Furthermore, the yoke 5 includes a body 53 and an insert 54 . The body 53 is provided with a mounting opening, the insert 54 is provided at the mounting opening, and the window 51 and the flange 52 are provided on the insert 54 .

[0046] As can be seen from the above description, the yoke 5 is composed of a main body 53 and an insert 54 that are connected to each other, which can facilitate the processing of the flange 52 and the height adjustment of the flange 52.

[0047] Furthermore, the insert 54 is bonded, clamped or welded to the body 53 .

[0048] As can be seen from the above description, there are a variety of specific connection methods for the insert 54 and the body 53 to choose from, which is conducive to enriching the diversity of micro speakers.

[0049] Furthermore, the magnetic permeability of the insert 54 is greater than or equal to the magnetic permeability of the yoke 5 .

[0050] As can be seen from the above description, the insert 54 is made of a material with higher magnetic permeability than the main body 53, which can provide higher magnetic conductivity, thereby greatly improving the acoustic performance of the micro speaker.

[0051] Furthermore, the insert 54 includes a flat plate portion, the window 51 is provided on the flat plate portion, and the flange 52 is connected to the flat plate portion.

[0052] As can be seen from the above description, the insert 54 has a simple structure and is easy to process and form.

[0053] Furthermore, the bottom surface of the body 53 has a positioning groove 531 for positioning the flat plate portion.

[0054] As can be seen from the above description, the provision of the positioning groove 531 can facilitate the positioning and installation of the insert 54 , thereby improving the consistency of the micro-speaker manufacturing.

[0055] Furthermore, the depth of the positioning groove 531 is greater than or equal to the thickness of the flat plate portion.

[0056] As can be seen from the above description, the bottom surface of the flat plate portion does not protrude from the bottom surface of the yoke 5 , which can effectively control the thickness of the micro speaker and ensure that the micro speaker can remain light and thin.

[0057] Example 1

[0058] Please refer to Figure 1 and Figure 2 , Embodiment 1 of the present invention is: a micro-speaker, comprising a basket 1, a vibration assembly and a magnetic circuit assembly, the vibration assembly and the magnetic circuit assembly being respectively connected to the basket 1; the vibration assembly comprising a diaphragm assembly 2 and a coaxially arranged inner voice coil 3 and outer voice coil 4, the diaphragm assembly 2 being respectively connected to the basket 1, the inner voice coil 3 and the outer voice coil 4, the inner voice coil 3 being located on the inner side of the outer voice coil 4; the magnetic circuit assembly comprising a yoke 5 and a central magnetic structure 6 and a side magnetic structure 7 respectively provided on the yoke 5, an external magnetic gap being formed between the central magnetic structure 6 and the side magnetic structure 7 for movement of the outer voice coil 4, the central magnetic structure 6 being in the shape of a ring frame, the yoke 5 being provided with a window 51 communicating with a hollow area of ​​the central magnetic structure 6, the edge of the window 51 having a flange 52 bent and extending into the hollow area of ​​the central magnetic structure 6, an internal magnetic gap being formed between the flange 52 and the central magnetic structure 6 for movement of the inner voice coil 3.

[0059] In this embodiment, the window 51 has flanges 52 on opposite sides thereof. The top end surfaces of the flanges 52 are arranged lower than or flush with the top surface of the central magnetic structure 6. This ensures that the diaphragm assembly 2 has sufficient downward vibration space and prevents collision between the diaphragm assembly 2 and the flanges 52. In actual products, it is also acceptable to arrange the top end surfaces of the flanges 52 slightly higher than the top surface of the central magnetic structure 6. This can reduce the processing precision requirements of the micro-speaker and facilitate its production.

[0060] The micro-speaker also includes a shaping support 8, and the shaping support 8 is respectively provided at both ends of the magnetic circuit assembly. The shaping support 8 includes an inner mounting portion, a deformation portion and an outer mounting portion connected in sequence. The inner mounting portion is fixedly connected to the diaphragm assembly 2, and the outer mounting portion is fixedly connected to the basin frame 1. The inner mounting portion is provided with an inner soldering pad, and the outer mounting portion is provided with an outer soldering pad electrically connected to the inner soldering pad. The outer soldering pad is exposed to the micro-speaker. The inner soldering pad of one of the shaping support pieces 8 is electrically connected to the inner voice coil 3, and the inner soldering pad of the other shaping support piece 8 is electrically connected to the outer voice coil 4.

[0061] The inner voice coil 3 and the outer voice coil 4 can be connected in parallel or independently controlled by an external power supply, that is, the inner voice coil 3 and the outer voice coil 4 can be used at the same time, or one of them can be powered on selectively. When the inner voice coil 3 and the outer voice coil 4 are powered on at the same time, the voltages applied can be the same or different, which can be set as needed.

[0062] Example 2

[0063] Please refer to Figure 3 and Figure 4 The second embodiment of the present invention is a further improvement on the yoke 5 based on the first embodiment. The difference from the first embodiment is that the yoke 5 includes a main body 53 and an insert 54. The main body 53 is provided with a mounting opening, and the insert 54 is provided at the mounting opening. The insert 54 is bonded, clamped, welded or connected to the main body 53 by other means, and the window 51 and the flange 52 are provided on the insert 54.

[0064] As a preferred embodiment, the magnetic permeability of the insert 54 is greater than or equal to the magnetic permeability of the yoke 5 . When the magnetic permeability of the insert 54 is equal to the magnetic permeability of the yoke 5 , the insert 54 with smaller size and freer design conditions is more convenient for forming the flange 52 .

[0065] In this embodiment, the insert 54 includes a flat plate portion, the window 51 is provided on the flat plate portion, and the flange 52 is connected to the flat plate portion. To facilitate the positioning and connection of the insert 54 and the main body 53, the window 51 is optionally located in the central area of ​​the flat plate portion.

[0066] The bottom surface of the body 53 has a positioning groove 531 for positioning the flat plate portion. The depth of the positioning groove 531 is greater than or equal to the thickness of the flat plate portion. In actual products, the depth of the positioning groove 531 may be slightly less than the thickness of the flat plate portion.

[0067] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A micro speaker, characterized in that include basin rack; A vibration assembly, comprising a diaphragm assembly and a coaxially arranged inner voice coil and outer voice coil, wherein the diaphragm assembly is connected to the basin frame, the inner voice coil and the outer voice coil respectively; A magnetic circuit assembly, comprising a yoke and a central magnetic structure and a side magnetic structure respectively arranged on the yoke, an external magnetic gap for movement of the outer voice coil being formed between the central magnetic structure and the side magnetic structures, the central magnetic structure being in the shape of a ring frame, a window being provided on the yoke for connecting to the hollow area of ​​the central magnetic structure, the edge of the window having a flange that bends and extends into the hollow area of ​​the central magnetic structure, an internal magnetic gap for movement of the inner voice coil being formed between the flange and the central magnetic structure.

2. The micro-speaker according to claim 1, wherein: The opposite sides of the window are respectively provided with the flanges.

3. The micro-speaker according to claim 1, wherein: The top end surface of the flange is arranged higher than, lower than or flush with the top surface of the central magnetic structure.

4. The micro-speaker according to claim 1, wherein: It also includes a shaping support piece, and the shaping support pieces are respectively provided at both ends of the magnetic circuit assembly. The shaping support piece includes an inner mounting portion, a deformation portion and an outer mounting portion connected in sequence. The inner mounting portion is fixedly connected to the diaphragm assembly, and the outer mounting portion is fixedly connected to the basin frame. The inner mounting portion is provided with an inner soldering pad, and the outer mounting portion is provided with an outer soldering pad electrically connected to the inner soldering pad. The inner soldering pad of one of the shaping support pieces is electrically connected to the inner voice coil, and the inner soldering pad of the other shaping support piece is electrically connected to the outer voice coil.

5. The micro-speaker according to claim 1, wherein: The yoke comprises a body and an insert, the body is provided with a mounting opening, the insert is arranged at the mounting opening, and the window and the flange are arranged on the insert.

6. The micro-speaker according to claim 5, wherein: The insert is bonded, clamped or welded to the body.

7. The micro-speaker according to claim 5, wherein: The magnetic permeability of the insert is greater than or equal to the magnetic permeability of the yoke.

8. The micro-speaker according to claim 5, wherein: The insert includes a flat plate portion, the window is provided on the flat plate portion, and the flange is connected to the flat plate portion.

9. The micro-speaker according to claim 8, wherein: The bottom surface of the body has a positioning groove for positioning the flat plate portion.

10. The micro-speaker according to claim 9, wherein: The depth of the positioning groove is greater than or equal to the thickness of the flat plate portion.

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