Voice coil and sound generating device

Abstract

The present invention discloses a voice coil and a sound-generating device, wherein the voice coil comprises a cylindrical frame and a coil formed by winding a voice coil wire around the outside of the frame, wherein the coil comprises at least a first coil segment and a second coil segment spaced apart in the axial direction of the frame, and a jumper is arranged between the first coil segment and the second coil segment to connect the first coil segment and the second coil segment in series. The technical solution of the present invention improves the BL linear region of the voice coil and avoids distortion during the sound generation process of the sound-generating device.

Description

Technical Field

[0001] The present invention relates to the field of acoustic technology, and in particular to a voice coil and a sound generating device using the voice coil. Background Art

[0002] In the related art, in order to make the sound-generating device such as a loudspeaker have a larger amplitude in the low-frequency region, a continuous and long coil is wound on the axial direction of the voice coil frame. Such a design will result in a larger overall mass of the voice coil and reduce the sensitivity of the voice coil. In order to improve the sensitivity of the voice coil, the axial length of the coil on the frame is also shortened in the related art, which will cause the coil to separate from the dense magnetic induction line area in the magnetic gap during the vibration of the voice coil, resulting in distortion of the sound-generating device during the sound generation process. Summary of the invention

[0003] The main purpose of the present invention is to provide a voice coil, aiming to improve the BL linear region of the voice coil and reduce the distortion phenomenon in the sound-generating process of the sound-generating device.

[0004] To achieve the above object, the voice coil proposed by the present invention comprises:

[0005] A skeleton forming a cylindrical shape; and

[0006] A coil is formed by winding a voice coil wire around the outside of the frame, wherein the coil includes at least a first coil segment and a second coil segment spaced apart in the axial direction of the frame, and a jumper is provided between the first coil segment and the second coil segment to connect the first coil segment and the second coil segment in series.

[0007] The technical solution of the present invention is to arrange the first coil segment and the second coil segment in the voice coil at intervals, and the first coil segment and the second coil segment are connected by a jumper. Due to the interval between the first coil segment and the second coil segment, the coil width is increased, so that the overall weight of the voice coil can be reduced, and the first coil segment and the second coil segment are connected by the jumper, so that the number of voice coil wire layers of the first voice coil and the second voice coil can be easily adjusted. During the vibration of the voice coil, the structure formed by the first coil segment and the second coil segment will always have a part of the structure in the dense magnetic line area, so that the BL linear area can be effectively improved to avoid distortion.

[0008] Optionally, the voice coil wires of the first coil segment and the second coil segment are a continuous voice coil wire.

[0009] Optionally, the jumper wire is a part of the voice coil wire in the first coil segment, or the jumper wire is a part of the voice coil wire in the second coil segment.

[0010] Optionally, the coil has an input line and an output line, the input line is arranged in the first coil segment, the output line is arranged in the second coil segment, or both the input line and the output line are arranged in the first coil segment.

[0011] Optionally, the first coil segment and the second coil segment have the same number of voice coil wire layers or different numbers of voice coil wire layers.

[0012] Optionally, there is one or at least two jumper wires between the first coil segment and the second coil segment.

[0013] Optionally, a wire diameter of the voice coil wire in the first coil segment is the same as or different from a wire diameter of the voice coil wire in the second coil segment.

[0014] The present invention further proposes a sound-generating device comprising a shell and a magnetic circuit system accommodated in the shell, the sound-generating device further comprising a voice coil as described in any of the above embodiments, the magnetic circuit system forms a magnetic gap, and one end of the voice coil extends into the magnetic gap.

[0015] Optionally, the magnetic circuit system includes a magnetic yoke, a central magnetic circuit part and a side magnetic circuit part arranged on the magnetic yoke, the magnetic gap is formed between the central magnetic circuit part and the side magnetic circuit part, a central magnetic conductive plate is arranged on the upper surface of the central magnetic circuit part, and the width of the gap between the first coil segment and the second coil segment is smaller than the thickness of the central magnetic conductive plate.

[0016] Optionally, the total length of the voice coil wire in the first coil segment is the same as the total length of the voice coil wire in the second coil segment, and the center of the gap between the first coil segment and the second coil segment is located on the horizontal center line of the central magnetic conductive plate.

[0017] Optionally, the first coil segment is located above the second coil segment;

[0018] The total length of the voice coil wire in the first coil segment is greater than the total length of the voice coil wire in the second coil segment, and the center of the gap between the first coil segment and the second coil segment is located below the horizontal center line of the central magnetic conductive plate;

[0019] Alternatively, the total length of the voice coil wire in the first coil segment is smaller than the total length of the voice coil wire in the second coil segment, and the center of the gap between the first coil segment and the second coil segment is located above the horizontal center line of the central magnetic conductive plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the exploded structure of the sound-generating device of the present invention;

[0022] Figure 2 for Figure 1 A cross-sectional view of another embodiment of a voice coil in a sound generating device;

[0023] Figure 3 A cross-sectional view of a first embodiment of a voice coil of the present invention;

[0024] Figure 4 is a cross-sectional view of a second embodiment of the voice coil of the present invention;

[0025] Figure 5 is a cross-sectional view of a third embodiment of the voice coil of the present invention;

[0026] Figure 6 is a cross-sectional view of a fourth embodiment of the voice coil of the present invention;

[0027] Figure 7 is a cross-sectional view of a fifth embodiment of the voice coil of the present invention;

[0028] Figure 8 for Figure 1 A cross-sectional view of a first embodiment of a sound-generating device;

[0029] Fig. 9 for Figure 1 A cross-sectional view of a second embodiment of the sound-generating device;

[0030] Fig.10 for Figure 1 A cross-sectional view of a third embodiment of the sound-generating device.

[0031] Description of Figure Numbers:

[0032]

[0033]

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The invention provides a sound generating device.

[0039] Please refer to Figure 1 , Figures 8 to 10 In an embodiment of the present invention, the sound-generating device 1 includes a shell and a vibration system 10 and a magnetic circuit system 20 accommodated in the shell.

[0040] The vibration system 10 includes a diaphragm 110 and a voice coil 120 fixed to one side of the diaphragm 110. The diaphragm 110 includes a central portion 111, a folded ring portion 112 disposed around the central portion 111, and a fixed portion 113 disposed around the folded ring portion 112; the diaphragm 110 may also include a composite layer 114 combined with the central portion 111.

[0041] The magnetic circuit system 20 includes a magnetic yoke fixed to the housing. The magnetic yoke is provided with an inner magnetic circuit portion 220 and an outer magnetic circuit portion 230 , and a magnetic gap for accommodating the voice coil 120 is formed therebetween.

[0042] In some embodiments, the magnetic yoke can be T-shaped or bowl-shaped. When the magnetic yoke is bowl-shaped, the inner magnetic circuit portion 220 includes a center magnet 221 arranged at the center position of the magnetic yoke and a center magnetic plate 222 arranged on the center magnet 221, and the magnetic gap is formed between the bowl wall of the magnetic yoke and the center magnet 221 and the center magnetic plate 222. When the magnetic yoke is T-shaped, the outer magnetic circuit portion 230 includes a side magnet arranged at the edge position of the magnetic yoke and a side magnetic plate arranged on the side magnet, and the magnetic gap is formed between the side magnet, the side magnetic plate and the T-shaped column.

[0043] In order to improve the acoustic performance of the sound-generating device 1 , the present invention further improves the voice coil 120 and proposes a voice coil 120 .

[0044] In the embodiment of the present invention, the voice coil 120 includes a cylindrical frame 130, a coil 140 formed by winding a voice coil wire, and the coil 140 includes at least a first coil segment 140a and a second coil segment 140b arranged at intervals, and a jumper 142 is arranged between the first coil segment 140a and the second coil segment 140b to connect the first coil segment 140a and the second coil segment 140b in series. In addition to the two segments shown in the figure, the coil 140 can also be three or four segments arranged at intervals. When the coil 140 is three or more segments, the adjacent coil segments can also be connected through the jumper 142. The material of the frame 130 can include paper such as kraft paper, fiber materials such as aromatic polyamide fiber, metal materials such as aluminum, and plastic materials such as polyimide. The structural strength of the entire voice coil 120 can be further improved by supporting the coil 140 through the frame 130. Furthermore, the first coil segment 140a, the second coil segment 140b and the frame 130 are coaxially arranged to achieve consistency during vibration and avoid noise.

[0045] The present invention replaces one coil segment placed in the magnetic gap in the prior art with two coil segments, and the two coil segments are connected by a jumper 142 to have a certain distance between them. When the total length of the voice coil line remains unchanged (the length of one coil segment in the prior art is the same as the sum of the lengths of the two voice coil segments in the present invention), the magnetic lines of force in the magnetic circuit system can be more fully utilized, thereby increasing the driving force of the magnetic circuit system on the voice coil. When the total length of the voice coil line is the same and the number of layers is the same, since there is a gap between the two coil segments, the height range of the coil 140 in the longitudinal direction can be increased, thereby improving the problem of insufficient utilization of magnetic lines of force caused by the easy deviation from the dense area of ​​magnetic lines of force during the up and down vibration of the voice coil in the prior art. The dense area of ​​magnetic lines of force refers to the area around the central magnetic conductive plate 222, specifically the area around the central magnetic conductive plate 222 corresponding to the upper surface and the lower surface of the midline magnetic conductive plate 222, in which the magnetic lines of force are the most dense and the magnetic field strength is the largest. In this structure of splitting one coil segment into two coil segments, at least a portion of the two coil segments will be placed in a magnetic field line intensive area during the vibration of the voice coil 120, and the utilization rate of the magnetic field lines is significantly higher than that of the traditional structure of one coil segment. In this embodiment, two coil segments correspond to one magnetic field line intensive area.

[0046] Next, the structure of the voice coil 120 of the present invention will be introduced from multiple dimensions.

[0047] Regarding the arrangement of the first coil segment 140 a and the second coil segment 140 b on the frame 130 .

[0048] Please refer to Figure 1 In one embodiment, the first coil segment 140a and the second coil segment 140b are both wound outside the frame 130. In this embodiment, the first coil segment 140a and the second coil segment 140b can be fixed to the outer wall surface of the frame 130 by gluing, and the first coil segment 140a and the second coil segment 140b are both wound outside the frame 130, so that the winding process of the first coil segment 140a and the second coil segment 140b can be completed on a straight columnar winding tool, which has higher production efficiency.

[0049] Regarding the winding structure of the coil segment.

[0050] The present invention preferably corresponds two coil segments to a magnetic field line intensive area. In order to improve the effective utilization of magnetic field lines, please refer to Figure 2Since the lower end of the first coil segment 140a and the upper end of the second coil segment 140b are closer to the area with dense magnetic lines of force, the present invention makes the number of windings in the voice coil wire layer of the lower part of the first coil segment 140a greater than the number of windings in the voice coil wire layer of the upper part, and the number of windings in the voice coil wire layer of the upper part of the second coil segment 140b is greater than the number of windings in the voice coil wire layer of the lower part. With this arrangement, after the voice coil 120 is inserted into the magnetic gap, the lower end of the first coil segment 140a with a denser number of windings and the upper end of the second coil segment 140b with a denser number of windings are concentrated in the area with dense magnetic lines of force. When the sound-generating device 1 is working and the voice coil 120 vibrates up and down, the BL asymmetry caused by different BL attenuation can be reduced, the distortion in the frequency band near FO is improved, and the sensitivity of the voice coil 120 under large voltage is improved, thereby improving the performance of the sound-generating device. FO is the inherent resonant frequency of the speaker in the low frequency band, abbreviated as FO. Within the effective audio frequency range of a normal speaker, the distortion in the frequency band near the FO point is the largest.

[0051] Furthermore, in some embodiments, the first coil segment 140a and the second coil segment 140b are wound by a continuous voice coil wire. The advantage of this is that during the manufacturing process, it can be completed on a straight columnar winding tool, which has higher production efficiency, fewer welding points, higher consistency of the overall structure, and higher structural stability.

[0052] The first coil segment 140a and the second coil segment 140b of the present invention are electrically connected in series, and the series connection can be achieved by the first coil segment 140a, the second coil segment 140b and the jumper wire 142 being wound by a continuous voice coil wire. Of course, when the first coil segment 140a and the second coil segment 140b are electrically connected in series, the first coil segment 140a and the second coil segment 140b may also be wound by different voice coil wires instead of a single voice coil wire, and the jumper wire 142 is a part of the voice coil wire in the first coil segment 140a, or the jumper wire 142 is a part of the voice coil wire in the second coil segment 140b.

[0053] Since the first coil segment 140a and the second coil segment 140b are electrically connected in series, during the operation of the voice coil 120, the position of the voice coil 120 in the magnetic gap can be modeled according to the electromotive force difference between the first coil segment 140a and the second coil segment 140b, so that the position of the voice coil 120 can be calculated in real time, so that the vibration system of the sound-generating device 1 can be optimized in real time to improve the acoustic performance of the sound-generating device 1. Specifically, when the two coil segments are connected in series, the first coil segment 140a and the second coil segment 140b have different positions in the magnetic field of the magnetic gap, so the magnetic induction intensity passing through the first coil segment 140a and the second coil segment 140b is also different, so the induced electromotive force generated by the first coil segment 140a and the second coil segment 140b is also different. By detecting the voltage difference at the connection between the first coil segment 140a and the second coil segment 140b, the relative position of the first coil segment 140a and the second coil segment 140b in the magnetic field, that is, the vibration position of the voice coil 120 as a whole in the magnetic field, can be calculated in real time.

[0054] If the voice coil 120 deviates from the preset position during the vibration process, the positions of the first coil segment 140a and the second coil segment 140b will change. At this time, the induced electromotive force generated by the first coil segment 140a and the second coil segment 140b will change, that is, the voltage difference at the connection between the first coil segment 140a and the second coil segment 140b changes. By detecting the change in the voltage difference, the overall offset of the voice coil 120 can be calculated, and the voice coil 120 can be returned to the preset position by externally inputting a compensation current, thereby correcting the position of the voice coil 120, so as to improve the vibration stability and symmetry of the voice coil 120 in the magnetic field, thereby effectively improving the overall acoustic performance of the sound-generating device 1.

[0055] Please refer to Figure 3 In the present application, the first coil segment 140a, the second coil segment 140b and the jumper wire 142 are connected in series as a continuous voice coil wire, so that the number of voice coil wire layers 141 of the coil 140 can be set as needed. For example, when the voice coil wire layers 141 in the first coil segment 140a and the second coil segment 140b are both three layers with an odd number of layers, the input line 143 of the coil 140 is arranged on one side of the first coil segment 140a, and the output line 144 of the coil 140 is arranged on one side of the second coil segment 140b. Such an arrangement enables the first coil segment 140a and the second coil segment 140b to be wound sequentially from top to bottom on a winding tool during the winding process of the coil 140, and the winding process is simple. In the case where the first coil segment 140a and the second coil segment 140b are both odd-numbered layers, the voice coil wire layers 141 in the first coil segment 140a and the second coil segment 140b may also be different, such as Figure 4As shown, the voice coil wire layer 141 of the first coil segment 140a is three layers, and the voice coil wire layer 141 of the second coil segment 140b is one layer, or as shown in FIG. Figure 5 As shown in FIG. 1 , the voice coil wire layer 141 of the first coil segment 140a is 5 layers, and the voice coil wire layer 141 of the second coil segment 140b is 3 layers, or as shown in FIG. Figure 6 As shown, the voice coil wire layer 141 of the first coil segment 140a is one layer, and the voice coil wire layer 141 of the second coil segment 140b is three layers. The above arrangement can also realize the winding from top to bottom in the process of winding the coil 140 by a winding tool, which is simple in the winding process. In the above arrangement, there is one jumper 142, which is connected to the outermost voice coil wire layer 141 in the first coil segment 140a and the innermost voice coil wire layer 141 in the second coil segment 140b (for example Figure 4 and Figure 5 ).

[0056] In addition, the voice coil wire layers 141 in the first coil segment 140a and the second coil segment 140b can also be even-numbered layers, such as Figure 7 As shown, the number of voice coil wire layers 141 in the first coil segment 140a and the second coil segment 140b is the same, both are four layers, and two jumpers 142 are provided, one jumper 142 connects the voice coil wire layer 141 in the middle of the first coil segment 140a and the innermost voice coil wire layer 141 in the second coil segment 140b, and the other jumper 142 connects the outermost voice coil wire layer 141 in the first coil segment 140a and the outermost voice coil wire layer 141 in the second coil segment 140b. This winding method enables the input wire 143 and the output wire 144 of the coil 140 to be located on the same side of the first coil segment 140a. This has the advantage that, during the vibration of the voice coil 120, it is not easy to generate stress at the input wire 143 and the output wire 144 to cause polarization, and the sound quality is improved.

[0057] In summary, the present invention can use the same number of voice coil wire layers 141 in the first coil segment 140a and the second coil segment 140b, wherein the voice coil wire layers 141 can be odd-numbered layers or even-numbered layers. When there are odd-numbered layers of voice coil wire layers 141, the input line 43 and the output line 44 are respectively located in the first coil segment 140a and the second coil segment 140b, so that the voice coil 120 can be wound sequentially from top to bottom on a winding tool during the winding process, and the winding process is more efficient. When there are even-numbered layers of voice coil wire layers 141, the input line 43 and the output line 44 can be located on the same side of the first coil segment 140a or on the same side of the second coil segment 140b. In this way, during the vibration of the voice coil 120, it is not easy to generate stress at the input line 143 and the output line 144 to cause polarization, and the sound quality is improved. It is worth mentioning that the same number of voice coil wire layers 141 in the first coil segment 140a and the second coil segment 140b can be used when the magnetic circuit in the sound-generating device 1 is relatively uniform and symmetrical, that is, the symmetrically designed voice coil 120 cooperates with the symmetrical magnetic circuit to obtain a more symmetrical BL curve, thereby improving the sound quality. Similarly, when different numbers of voice coil wire layers 141 are used in the first coil segment 140a and the second coil segment 140b, it is because of the asymmetry in the magnetic circuit design. The number of voice coil wire layers 141 in the coil segment corresponding to the area with dense magnetic lines of force is also large, while the number of voice coil wire layers 141 in the coil segment corresponding to the area with dense and less dense magnetic lines of force is also reduced accordingly, so as to compensate for the asymmetry of the magnetic circuit design, reduce the BL asymmetry caused by different BL attenuation, and obtain a more symmetrical BL curve.

[0058] About the structure of voice coil wire.

[0059] The voice coil wire material may be enameled wire, and the wire diameter of the voice coil wire in the voice coil 120 may be selected to be in the range of 0.03 to 0.20 mm. If the wire diameter is above 0.20 mm, the specific gravity of the voice coil 120 becomes larger, and the vibration loss is large. If the wire diameter is below 0.03 mm, the strength may be insufficient, and it is difficult to achieve high-power output of the sound-generating device 1. Since there is a gap between the first coil segment 140a and the second coil segment 140b, the longitudinal height of the coil 140 is increased. During the vibration of the voice coil 120, part of the structure of the first coil segment 140a and the second coil segment 140 will always be in the dense magnetic field line area, which can effectively improve the BL linear area and avoid distortion.

[0060] In some embodiments, the voice coil wire in the first coil segment 140a and the voice coil wire in the second coil segment 140b have the same conductivity. When the voice coil wire in the first coil segment 140a and the voice coil wire in the second coil segment 140b have the same conductivity, the first coil segment 140a and the second coil segment 140b may be wound by a continuous voice coil wire, or the first coil segment 140a and the second coil segment 140b may be wound by two different voice coil wires, and the materials and structures in the first coil segment 140a and the second coil segment 140b are the same. The above configuration can make the BL curve of the voice coil 120 more symmetrical and the acoustic performance of the sound-generating device 1 better.

[0061] In addition, the conductivity of the voice coil wire in the first coil segment 140a and the voice coil wire in the second coil segment 140b may also be different. For example, the conductor layer 1411 of the voice coil wire in the first coil segment 140a is copper wire, and the conductor layer 1411 of the voice coil wire in the second coil segment 140b is copper clad aluminum wire. In this way, the density of the copper clad aluminum wire is less than the density of the copper wire. Then, the weight of the second coil segment 140b with the same total length will be less than the weight of the first coil segment 140a. That is, compared with the prior art solution in which the conductor layer 1411 of the voice coil wire in the first coil segment 140a and the conductor layer 1411 of the voice coil wire in the second coil segment 140b are both copper wires, the weight of the voice coil 120 of the present invention is reduced, thereby improving the sensitivity of the voice coil 120.

[0062] In some embodiments, the wire diameter of the voice coil wire in the first coil segment 140a is the same as the wire diameter of the voice coil wire in the second coil segment 140b. In this configuration, when the total length of the first coil segment 140a and the second coil segment 140b is the same, the driving forces of the first coil segment 140a and the second coil segment 140b are equivalent, and the BL linear region of the voice coil 120 is more symmetrical and the acoustic performance is better. Alternatively, the wire diameter of the voice coil wire in the first coil segment 140a is different from the wire diameter of the voice coil wire in the second coil segment 140b. In this way, the material selection of the voice coil wire is less restricted during the production of the first coil segment 140a and the second coil segment 140b, and the production is easier.

[0063] From the above content, we know that one end of the voice coil 120 extends into the magnetic gap, and a central magnetic conductive plate 222 is provided on the upper surface of the inner magnetic circuit portion 220. Since the magnetic lines of force in the magnetic circuit system 20 in the sound-generating device 1 can be gathered through the central magnetic conductive plate 222 for full utilization, the height range corresponding to the central magnetic conductive plate 222 in the magnetic gap is a magnetic line-intensive area. In order to effectively utilize the magnetic lines of force and realize sensitive driving of the voice coil 120, in this application, the width of the gap between the second coil segment 140b and the first coil segment 140a is smaller than the width of the central magnetic conductive plate 222. Thickness, in the natural state, the gap between the second coil segment 140b and the first coil segment 140a of the present application is within the height area of ​​the central magnetic conductive plate 222; and because the width of the gap between the second coil segment 140b and the first coil segment 140a is smaller than the thickness of the central magnetic conductive plate 222, the lower end of the first coil segment 140a and the upper end of the second coil segment 140b are both located in the magnetic field line intensive area, then the first coil segment 140a and the second coil segment 140b can both cut the magnetic field lines during the startup phase and thus push the diaphragm 110 upward or downward.

[0064] Please refer to Figure 8 In some embodiments, the total length of the voice coil wire in the first coil segment 140a is the same as the total length of the voice coil wire in the second coil segment 140b, and the center of the gap between the first coil segment 140a and the second coil segment 140b is located on the horizontal center line of the central magnetic conductive plate 222. In this embodiment, the total length of the voice coil wire in the first coil segment 140a is the same as the total length of the voice coil wire in the second coil segment 140b, the symmetry of the BL is good, and the nonlinear distortion is reduced.

[0065] Please refer to Fig. 9 In some embodiments, the total length of the voice coil wire in the first coil segment 140a is greater than the total length of the voice coil wire in the second coil segment 140b, and the center of the gap between the first coil segment 140a and the second coil segment 140b is located below the horizontal center line of the central magnetic plate 222. In this embodiment, while effectively improving the nonlinear distortion, the peak value of the voice coil 120 vibrating in the direction of the first coil segment 140a (i.e., the upward vibration in the figure) is large, which is conducive to expressing a specific required sound quality effect.

[0066] Please refer to Fig.10In some embodiments, the total length of the voice coil wire in the first coil segment 140a is less than the total length of the voice coil wire in the second coil segment 140b, and the center of the gap between the first coil segment 140a and the second coil segment 140b is located above the horizontal center line of the central magnetic plate 222. In this embodiment, while effectively improving the nonlinear distortion, the peak value of the voice coil 120 vibrating in the direction of the second coil segment 140b (i.e., vibrating downward in the figure) is large, which is also conducive to expressing a specific required sound quality effect.

[0067] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A voice coil, characterized in that: include: A cylindrical skeleton is formed; and a coil formed by winding a voice coil wire around the outside of the frame, wherein the coil comprises at least a first coil segment and a second coil segment spaced apart in the axial direction of the frame, a jumper wire is provided between the first coil segment and the second coil segment to connect the first coil segment and the second coil segment in series; The number of turns in the lower voice coil wire layer of the first coil segment is greater than that in the upper voice coil wire layer, and the number of turns in the upper voice coil wire layer of the second coil segment is greater than that in the lower voice coil wire layer.

2. The voice coil according to claim 1, wherein: The voice coil wire in the first coil segment, the voice coil wire in the second coil segment and the jumper wire form a continuous voice coil wire.

3. The voice coil according to claim 1, wherein: The jumper wire is a part of the voice coil wire in the first coil segment, or the jumper wire is a part of the voice coil wire in the second coil segment.

4. The voice coil according to any one of claims 1 to 3, characterized in that: The coil has an input line and an output line, wherein the input line is arranged in the first coil segment, and the output line is arranged in the second coil segment, or the input line and the output line are both arranged in the first coil segment.

5. The voice coil according to any one of claims 1 to 3, characterized in that: The first coil segment and the second coil segment have the same number of voice coil wire layers or have different numbers of voice coil wire layers.

6. The voice coil according to claim 5, wherein: There is one or at least two jumper wires between the first coil segment and the second coil segment.

7. The voice coil according to claim 1, wherein: The wire diameter of the voice coil wire in the first coil segment is the same as or different from the wire diameter of the voice coil wire in the second coil segment.

8. A sound-generating device, comprising a housing and a magnetic circuit system contained in the housing, characterized in that: It also comprises the voice coil as claimed in any one of claims 1 to 7, wherein the magnetic circuit system forms a magnetic gap, and one end of the voice coil extends into the magnetic gap.

9. The sound-generating device according to claim 8, characterized in that: The magnetic circuit system includes a magnetic yoke, a central magnetic circuit part and a side magnetic circuit part arranged on the magnetic yoke, the magnetic gap is formed between the central magnetic circuit part and the side magnetic circuit part, a central magnetic plate is arranged on the upper surface of the central magnetic circuit part, and the width of the gap between the first coil segment and the second coil segment is smaller than the thickness of the central magnetic plate.

10. The sound generating device according to claim 9, characterized in that: The total length of the voice coil wire in the first coil segment is the same as the total length of the voice coil wire in the second coil segment, and the center of the gap between the first coil segment and the second coil segment is located on the horizontal center line of the central magnetic conductive plate.

11. The sound generating device according to claim 10, characterized in that: The first coil segment is located above the second coil segment; The total length of the voice coil wire in the first coil segment is greater than the total length of the voice coil wire in the second coil segment, and the center of the gap between the first coil segment and the second coil segment is located below the horizontal center line of the central magnetic conductive plate; Alternatively, the total length of the voice coil wire in the first coil segment is smaller than the total length of the voice coil wire in the second coil segment, and the center of the gap between the first coil segment and the second coil segment is located above the horizontal center line of the central magnetic conductive plate.

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