Voice coil and speaker module

Abstract

The present application provides a voice coil and a speaker module. The voice coil of the present application comprises N winding layers wound from inside to outside, N being an integer greater than 1, and adjacent winding layers being connected via winding switching portions. The winding turn counts of the respective winding layers are not completely identical. The winding switching portions comprise a first winding switching portion disposed between winding layers having different winding turn counts, and a second winding switching portion disposed between winding layers having a same winding turn count. The first winding switching portion is disposed in a transition region where the winding turn count of the winding layer changes. In the voice coil of the present application, by disposing the first winding switching portion in the transition region where the winding turn count of the winding layer changes, the thickness of the first winding switching portion is offset by an accommodating space, so that the provision of the first winding switching portion does not increase the wall thickness of the voice coil, thereby reducing the influence of the voice coil on a magnetic gap and improving conversion efficiency. When the voice coil is applied to a speaker module, the sensitivity of the speaker module can be improved.

Description

A voice coil and a speaker module Technical Field

[0001] This application relates to the field of electroacoustic technology, specifically to a voice coil and a loudspeaker module. Background Technology

[0002] In existing technologies, the voice coil of a loudspeaker module consists of N winding layers 210 arranged from the inside out. Since the N winding layers 210 are wound with a single enameled wire, a winding switching section is formed when changing layers from the Nth layer to the N+1th layer during the winding process. As shown in Figure 1, in the prior art, the winding switching sections of the voice coil are concentrated in corresponding areas from the inside out. This results in the layer switching sections stacking from the inside out, increasing the wall thickness of the voice coil and the corresponding areas of the winding switching sections. This occupies more magnetic gap space, affects the magnetic gap, and thus reduces the sensitivity of the loudspeaker module.

[0003] Therefore, it is necessary to provide a voice coil that can reduce the impact on the magnetic gap and improve the sensitivity of the speaker module, as well as a speaker module having the voice coil. Technical issues

[0004] The purpose of this application is to provide a voice coil and a loudspeaker module to improve the structural compactness of the voice coil, reduce the influence of the voice coil on the magnetic gap, and improve the sensitivity of the loudspeaker module having the voice coil. Technical solutions

[0005] In a first aspect, this application provides a voice coil comprising N winding layers formed from the inside out, where N is an integer greater than 1, and adjacent winding layers are connected by a winding switching section; the number of turns in each winding layer is not exactly the same, and the winding switching section includes a first winding switching section disposed between winding layers with different numbers of turns and a second winding switching section disposed between winding layers with the same number of turns; the first winding switching section is disposed in the transition region of the number of turns of the winding layer; the first winding switching section and the second winding switching section are correspondingly disposed along the wall thickness direction of the voice coil; the winding layers with the same number of turns are staggered, and the first winding switching section is disposed at the staggered gap formed by the staggered winding layers.

[0006] Optionally, the first winding switching part and the second winding switching part are disposed separately, and the projections of the first winding switching part and the second winding switching part along the z-direction do not overlap.

[0007] Optionally, the winding layers are connected from the inside to the outside to form a voice coil body, and the voice coil also includes a voice coil input terminal and a voice coil output terminal respectively connected to two ends of the voice coil body.

[0008] Optionally, the voice coil is made of enameled wire, and the conductive core of the enameled wire is made of copper, aluminum, copper-aluminum alloy, or copper-clad aluminum.

[0009] Secondly, this application provides a loudspeaker module, including a frame and a vibration system and a magnetic circuit system housed within the frame, the vibration system including a voice coil as described above.

[0010] Optionally, the magnetic circuit system includes an upper clamping plate and a lower clamping plate arranged in parallel, an inner magnet, a pole core and an outer magnet disposed on the lower clamping plate, and a side magnet disposed along the circumference of the inner magnet; there is a magnetic gap between the inner magnet and the side magnet, the voice coil is disposed in the magnetic gap, and the inner magnet, the pole core and the outer magnet are disposed on the lower clamping plate from bottom to top.

[0011] Optionally, the vibration system further includes an inner diaphragm disposed above the outer magnet, a frame disposed around the outer periphery of the inner diaphragm, an upper diaphragm disposed along the outer periphery of the frame, a flexible circuit board disposed below the upper diaphragm, and a lower diaphragm disposed below the flexible circuit board. The flexible circuit board is connected to the voice coil, and the frame is connected to the flexible circuit board to support the vibration system on the flexible circuit board. Beneficial effects

[0012] The beneficial effects of this application are as follows: The voice coil winding switching part of this application includes a first winding switching part and a second winding switching part. The first winding switching part is disposed in the region where the number of winding turns of the winding layer changes. The structure of the region where the number of winding turns of the winding layer changes forms a gap. The gap forms an accommodating space for the first winding switching part. By disposing the first winding switching part in the region where the number of winding turns of the winding layer changes, the thickness of the first winding switching part is offset by the accommodating space. The setting of the first winding switching part does not increase the wall thickness of the voice coil, thereby reducing the influence of the voice coil on the magnetic gap and improving the conversion efficiency. Applying the voice coil to the speaker module can improve the sensitivity of the speaker module. Attached Figure Description

[0013] Figure 1 is a schematic diagram of the distribution of the winding switching section in the winding layer of the voice coil in the prior art.

[0014] Figure 2 is a schematic diagram of one structure of the winding layer in the voice coil of this application.

[0015] Figure 3 is a schematic diagram of another structure of the winding layer in the voice coil of this application.

[0016] Figure 4 is a schematic diagram of the voice coil structure of this application.

[0017] Figure 5 is a structural schematic diagram of the speaker module of this application.

[0018] Figure 6 is a cross-sectional view along the AA direction of the view in Figure 5.

[0019] Figure 7 is an exploded view of the speaker module. Embodiments of the present invention

[0020] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example: Referring to Figures 2 to 4, in some embodiments, the voice coil 21 includes N winding layers 211 formed from the inside out, where N is an integer greater than 1. Adjacent winding layers 211 are connected by a winding switching part 212. The number of turns of each winding layer 211 is not exactly the same. The winding switching part 212 includes a first winding switching part 2121 disposed between winding layers 211 with different numbers of turns and a second winding switching part 2122 disposed between winding layers 211 with the same number of turns. The first winding switching part 2121 is disposed in the transition region of the number of turns of the winding layer 211.

[0022] The voice coil 21 winding switching section 212 described in this application includes a first winding switching section 2121 and a second winding switching section 2122. The first winding switching section 2121 is disposed in the region where the number of winding turns of the winding layer 211 changes. The structure of the region where the number of winding turns of the winding layer 211 changes forms a gap, and the gap forms an accommodating space for the first winding switching section 2121. By disposing the first winding switching section 2121 in the region where the number of winding turns of the winding layer 211 changes, the thickness of the first winding switching section 2121 is offset by the accommodating space. The setting of the first winding switching section 2121 does not increase the wall thickness of the voice coil 21, thereby reducing the influence of the voice coil 21 on the magnetic gap and improving the conversion efficiency. After applying the voice coil 21 to the speaker module, the sensitivity of the speaker module can be improved.

[0023] It should be noted that "inward direction" refers to the direction close to the central axis of the voice coil, and "outward direction" refers to the direction away from the central axis of the voice coil. The x, y, and z directions are mutually perpendicular in space, with the z direction being parallel to the direction of vibration.

[0024] Referring to Figure 2, in some embodiments, the first winding switching part 2121 and the second winding switching part 2122 are correspondingly arranged along the wall thickness direction of the voice coil 21. The first winding switching part 2121 is located in the region where the number of winding turns of the winding layer 211 changes. This region forms a gap in the structure of the winding layer 211, creating a accommodating space for the first winding switching part 2121. By placing the first winding switching part 2121 in this region, the thickness of the first winding switching part 2121 is offset by the accommodating space. In this case, the wall thickness formed by the structural arrangement of the winding switching part 212 is also less than the maximum wall thickness of the voice coil 21, thus avoiding the impact of the increased wall thickness of the voice coil 21 caused by the arrangement of the winding switching part 212 on the magnetic gap.

[0025] Referring to Figure 3, in some further embodiments, the winding layers 211 with the same number of turns are staggered. When the winding layers 211 are staggered, the enameled wire of the outer winding layer 211 is wound around the gap of the enameled wire of the inner winding layer 211. The first winding switching part 2121 is located at the staggered gap formed by the staggered winding layers 211. In this embodiment, under the condition that the first winding switching part 2121 is located in the region where the number of turns of the winding layer 211 changes, the setting position of the second winding switching part 2122 is further adjusted, and it is set within the staggered space of the winding layers 211. This further reduces the increase in the wall thickness of the voice coil 21 caused by the setting of the winding switching part 212, and avoids the influence of the increase in the wall thickness of the voice coil 21 on the magnetic gap.

[0026] In some implementations, the first winding switching part 2121 and the second winding switching part 2122 are distributed separately, and their projections along the z-direction do not overlap. Distributing the first winding switching part 2121 and the second winding switching part 2122 separately avoids the increase in the wall thickness of the voice coil 21 caused by the overall concentration of the winding switching parts 212 along the wall thickness direction of the voice coil 21. This further reduces the influence of the voice coil 21 on the magnetic gap, ensures the conversion efficiency of the voice coil 21, and enhances the sensitivity of the speaker module equipped with the voice coil 21.

[0027] Optionally, as shown in Figure 4, the winding layer 211 is connected from the inside to the outside to form a voice coil body 213. The voice coil 21 also includes a voice coil input terminal 214 and a voice coil output terminal 215 respectively connected to the two ends of the voice coil body 213.

[0028] The voice coil 21 is made of enameled wire, and the conductive core of the enameled wire is made of copper, aluminum, copper-aluminum alloy or copper-clad aluminum.

[0029] This application embodiment also provides a loudspeaker module, as shown in Figures 5 to 7. The loudspeaker module includes a frame 1 and a vibration system 2 and a magnetic circuit system 3 housed within the frame 1. The vibration system 2 includes a voice coil 21 as described above.

[0030] Furthermore, the magnetic circuit system 3 includes an upper clamping plate 31 and a lower clamping plate 32 arranged in parallel, an inner magnet 33, a pole core 34, and an outer magnet 35 disposed on the lower clamping plate 32, and a side magnet 36 disposed circumferentially along the inner magnet 33; a magnetic gap exists between the inner magnet 33 and the side magnet 36, and the voice coil 21 is disposed in the magnetic gap; the inner magnet 33, the pole core 34, and the outer magnet 35 are disposed sequentially from bottom to top on the lower clamping plate 32. It should be noted that the "direction" refers to the direction away from the lower clamping plate 32 along the z-axis, and the "direction downward" refers to the direction closer to the lower clamping plate 32 along the z-axis.

[0031] The vibration system 2 further includes an inner diaphragm 22 disposed above the outer magnet 35, a frame 23 disposed around the outer periphery of the inner diaphragm 22, an upper diaphragm 24 disposed around the outer periphery of the frame 23, a flexible circuit board 25 disposed below the upper diaphragm 24, and a lower diaphragm 26 disposed below the flexible circuit board 25. The flexible circuit board 25 is connected to the voice coil 21. The voice coil 21 is connected to the flexible circuit board 25 through the voice coil output terminal 215 and the voice coil input terminal 214, respectively. The frame 23 is connected to the flexible circuit board 25 to support the vibration system 2 on the flexible circuit board 25.

[0032] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. A voice coil, characterized by: The voice coil comprises N wire winding layers formed by winding from inside to outside, N is an integer greater than 1, adjacent wire winding layers are connected through wire switching parts; the number of turns of each wire winding layer is not completely the same, the wire switching part comprises a first wire switching part arranged between the wire winding layers with different number of turns and a second wire switching part arranged between the wire winding layers with the same number of turns; the first wire switching part is arranged in the transition area of the number of turns of the wire winding layer; the first wire switching part and the second wire switching part are arranged correspondingly along the thickness direction of the voice coil; the wire winding layers with the same number of turns are arranged in a staggered manner, and the first wire switching part is arranged at the staggered gap formed by the wire winding layers.

2. The voice coil of claim 1, wherein: The first wire switching part and the second wire switching part are arranged separately, and the projections of the first wire switching part and the second wire switching part along the z direction do not overlap each other.

3. The voice coil of claim 1, wherein: The wire winding layers are connected to form a voice coil body from inside to outside, and the voice coil further comprises a voice coil input end and a voice coil output end connected to two end portions of the voice coil body respectively.

4. The voice coil of claim 1, wherein: The voice coil is wound by an enameled wire, and the conductive wire core of the enameled wire adopts a copper wire core, an aluminum wire core, a copper-aluminum alloy wire core or a copper-clad aluminum wire.

5. A speaker module, characterized by: The loudspeaker comprises a yoke, a vibration system and a magnetic circuit system accommodated in the yoke, and the vibration system comprises the voice coil according to any one of claims 1-4.

6. The speaker module of claim 5, wherein: The magnetic circuit system comprises upper and lower clamping plates arranged in parallel, an inner magnetic steel, a pole core and an outer magnetic steel arranged on the lower clamping plate, and an edge magnetic steel arranged circumferentially along the inner magnetic steel; the inner magnetic steel and the edge magnetic steel have a magnetic gap therebetween, and the voice coil is arranged in the magnetic gap; the inner magnetic steel, the pole core and the outer magnetic steel are sequentially arranged on the lower clamping plate from bottom to top.

7. The speaker module of claim 6, wherein: The vibration system further comprises an inner diaphragm arranged above the outer magnetic steel, a skeleton arranged at the outer periphery of the inner diaphragm, an upper diaphragm arranged along the outer periphery of the skeleton, a flexible circuit board arranged below the upper diaphragm, and a lower diaphragm arranged below the flexible circuit board; the flexible circuit board is in conduction with the voice coil, and the skeleton is connected to the flexible circuit board to support the vibration system on the flexible circuit board.

Images