Coil assembly, speaker module, earphone and electronic device

Abstract

The application provides a coil assembly, a loudspeaker module, earphones and electronic equipment. The coil assembly comprises a winding part in the form of a hollow cylinder, the winding part comprises at least one winding layer, the winding layer comprises a plurality of winding coils arranged in the axial direction, the winding coil comprises a first winding and a second winding, the second winding is arranged in parallel with the first winding, and the winding track of the second winding is parallel to the winding track of the first winding. The above-mentioned double-wire parallel winding can improve the flexibility of the coil parameters, flexibly match different driving requirements by adjusting the parallel or series combination of the double wires, increase the probability of realizing more turns in the magnetic gap, improve the magnetic field utilization rate, increase the effective wire length, and reduce the harmonic distortion. By optimizing the winding density and mass, the dynamic performance of the diaphragm can be improved. The double-wire parallel winding can share the mechanical fatigue stress during vibration, and reduce the risk of fatigue wire breakage of a single wire.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to a coil assembly, a speaker module, headphones, and electronic devices. Background Technology

[0002] The conventional topology of wound coils is simple and inflexible, which limits the design of parameters such as coil width and length. Therefore, improving the flexibility of coil parameters has become a technical problem that needs to be solved. Utility Model Content

[0003] This application provides a coil assembly, speaker module, headphones, and electronic device that improves the flexibility of coil parameters.

[0004] In a first aspect, this application provides a coil assembly, the coil assembly including a hollow cylindrical winding portion, the winding portion including at least one winding coil layer, the winding coil layer including multiple turns of winding coil arranged axially, the winding coil including: First winding; The second winding is arranged in parallel with the first winding, and the winding trajectory of the second winding is parallel to the winding trajectory of the first winding.

[0005] The coil assembly provided in this application includes a hollow cylindrical winding portion, the winding portion including at least one winding coil layer, the winding coil layer including multiple turns of winding coil arranged along the axial direction, the winding coil including a first winding and a second winding, the second winding and the first winding being arranged in parallel, the winding trajectory of the second winding being parallel to the winding trajectory of the first winding, the coil formed by the above two windings can improve the flexibility of coil parameters.

[0006] Secondly, this application provides a coil assembly, including an inlet end, a winding portion and an outlet end, wherein the inlet end and the outlet end are located on the same side of the winding portion, and the winding portion has an odd number of wire layers along the radial direction.

[0007] Thirdly, this application provides a speaker module, including: Diaphragm As described in the first or second aspect, one end of the coil assembly is connected to one side of the diaphragm along the axial direction.

[0008] Fourthly, this application provides an earphone, including a coil assembly as described in the first or second aspect, or a speaker module as described in the third aspect.

[0009] Fifthly, this application provides an electronic device including a coil assembly as described in the first or second aspect, or a speaker module as described in the third aspect. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0011] Figure 1 This is a perspective view of the first type of coil assembly provided in Embodiment 1 of this application in the pulled-out state; Figure 2 This is a front view of the first type of coil assembly provided in Embodiment 1 of this application; Figure 3 This is a top view of the first type of coil assembly provided in Embodiment 1 of this application; Figure 4 This is a cross-sectional view along line AA of the first type of coil assembly provided in Embodiment 1 of this application; Figure 5 This is a top view of the second type of coil assembly provided in Embodiment 1 of this application; Figure 6 This is a cross-section along the BB line of the second type of coil assembly provided in Embodiment 1 of this application. Figure 1 ; Figure 7 This is a partial schematic diagram of the combined winding provided in an embodiment of this application; Figure 8 This is a schematic diagram showing the first and second windings arranged side by side along the axial direction according to an embodiment of this application; Figure 9 This is a top view of the third type of coil assembly provided in Embodiment 1 of this application; Figure 10 This is a cross-section along the CC line of the third type of coil assembly provided in Embodiment 1 of this application. Figure 1 ; Figure 11 This is a schematic diagram showing the first and second windings arranged radially side by side according to an embodiment of this application; Figure 12 This is a cross-section along the CC line of the third type of coil assembly provided in Embodiment 1 of this application. Figure 2 ; Figure 13 This is a cross-section along the BB line of the second type of coil assembly provided in Embodiment 1 of this application. Figure 2 ; Figure 14 This is a top view of the fourth type of coil assembly provided in Embodiment 1 of this application; Figure 15 This is a cross-section along the DD line of the fourth type of coil assembly provided in Embodiment 1 of this application. Figure 1 ; Figure 16 This is a schematic diagram of a first electrical connection relationship between the first winding and the second winding provided in an embodiment of this application; Figure 17 This is a schematic diagram of a second electrical connection relationship between the first winding and the second winding provided in an embodiment of this application; Figure 18 This is a schematic diagram of a third electrical connection relationship between the first winding and the second winding provided in the embodiments of this application; Figure 19 This is a cross-section along the DD line of the fourth type of coil assembly provided in Embodiment 1 of this application. Figure 2 ; Figure 20 This is a cross-sectional view of a coil assembly provided in Embodiment 2 of this application; Figure 21 This is a cross-sectional view of a speaker module provided in an embodiment of this application. Detailed Implementation

[0012] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the embodiments described in this application are only a part of the embodiments, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without creative effort are within the protection scope of this application.

[0013] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0014] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, an assembly or device comprising one or more components is not limited to the one or more components listed, but may optionally also include one or more components not listed but inherent to the exemplified product, or one or more components that it should have based on the described function.

[0015] Please see Figure 1 Embodiment 1 of this application provides a coil assembly 100 that improves the flexibility of coil parameters and increases the effective wire length.

[0016] The coils in the coil assembly 100 include, but are not limited to, electromagnetic coils. The coil assembly 100 includes, but is not limited to, any one of actuators / drivers, sensors, energy conversion and transmission devices, magnetic field generating devices, and radio frequency devices. Actuators / drivers include, but are not limited to, at least one of voice coil motors, solenoid valves, relays / contactors, and electromagnetic brakes / clutches. Sensors include, but are not limited to, at least one of inductive sensors, linear variable differential transformers, current transformers, and eddy current sensors. Energy conversion and transmission devices include, but are not limited to, at least one of motor windings, transformer windings, inductors / chokes, and wireless charging transmitter / receiver coils (for wireless charging of smartphones, headphones, electric toothbrushes, electric vehicles, etc.). Magnetic field generating devices include, but are not limited to, electromagnets. Radio frequency devices include, but are not limited to, at least one of antennas, radio frequency inductors / transformers, and induction heating coils.

[0017] This embodiment uses the application of the coil assembly 100 to the voice coil as an example for illustration.

[0018] Please see Figures 1-3 The coil assembly 100 includes a winding portion 10 that is hollow and cylindrical.

[0019] This application does not specifically limit the shape of the hollow inner cavity of the winding portion 10. The shape of the hollow inner cavity of the winding portion 10 includes, but is not limited to, at least one of the following: cylindrical cavity, prismatic cavity, square cylinder cavity, rhomboid cylinder cavity, hexagonal cylinder cavity, etc.

[0020] Optionally, the winding section 10 is a hollow cylindrical structure formed by spiral winding of the wire.

[0021] Optionally, the coil assembly 100 has a hollow internal structure, thus the coil assembly 100 is a frameless coil, also known as a self-supporting coil. In this embodiment, the hollow inner cavity of the winding portion 10 is cylindrical as an example.

[0022] Please see Figures 2-4 The winding portion 10 includes at least one winding coil layer 13.

[0023] Please see Figures 2-4 Specifically, each layer of the winding coil 13 includes multiple turns of winding coil 12 arranged axially. The winding coil is wrapped circumferentially once to form the winding coil 12.

[0024] In this process, the winding coil is wound multiple times along the axial direction from the top position along a spiral trajectory to the bottom position to form a winding coil layer 13.

[0025] Optional, please refer to Figures 2-4 The winding section 10 includes a winding coil layer 13.

[0026] Alternatively, please refer to Figures 5-6 The winding section 10 includes multiple layers of winding coils 13 arranged radially.

[0027] Specifically, the winding thread is wound in a spiral pattern multiple times from the top position to the bottom position to form the first layer of winding coil 13. Then, the winding thread is wound back in a spiral pattern from the bottom position to the top position to form the second layer of winding coil 13, and so on, to form multiple layers of winding coil 13. The second layer of winding coil 13 and the first layer of winding coil 13 are arranged radially, and the second layer of winding coil 13 surrounds the outer periphery of the first layer of winding coil 13.

[0028] Here, the axial direction is the direction of the central axis along the height of the coil assembly 100. The radial direction is the direction perpendicular to the axial direction.

[0029] The following provides a specific example illustrating the structure of the winding coil 12.

[0030] Please see Figures 2-6 The winding coil 12 includes at least two parallel windings. In other words, the winding coil 12 is formed by winding at least two parallel windings. The at least two parallel windings of the winding coil 12 are defined as a combined winding 11.

[0031] This application does not impose a specific limitation on the number of parallel windings in the coil 12. Optionally, the number of parallel windings may include, but is not limited to, 2, 3, or 4. When the number of parallel windings in the coil 12 is multiple, the electrical connection relationship between the multiple windings can be flexibly designed. For example, all windings can be connected in parallel to reduce coil resistance, or all windings can be connected in series to increase wire length, or some windings can be connected in series and others in parallel, to flexibly match different resistance and performance requirements.

[0032] Please see Figure 7 Optionally, the winding coil 12 includes at least a first winding 111 and a second winding 112.

[0033] This application does not impose specific limitations on the cross-sectional shape of the winding. The cross-sectional shape of the winding includes, but is not limited to, circular, square, elliptical, and flat shapes. In this embodiment, a circular cross-sectional shape of the winding is taken as an example.

[0034] Please see Figures 2-7Optionally, the second winding 112 is arranged in parallel with the first winding 111. Specifically, the first winding 111 and the second winding 112 are arranged side by side and close together, and the first winding 111 and the second winding 112 are wound together along the same helical trajectory, so that the winding trajectory of the second winding 112 is parallel to the winding trajectory of the first winding 111. In this way, the gap between the first winding 111 and the second winding 112 is reduced, and the structural strength, stability and dimensional accuracy of the winding assembly are increased.

[0035] For the entire winding section 10, the first winding 111 and the second winding 112 are always wound in parallel, making the winding of the winding section 10 neat and the winding gap small; the entire winding section 10 has a high density, and the entire winding section 10 has relatively strong rigidity, strong torsional resistance, and strong vibration deformation resistance.

[0036] The coil assembly 100 provided in this application includes a hollow cylindrical winding portion 10, which includes at least one winding coil layer 13. The winding coil layer 13 includes multiple turns of winding coil 12 arranged axially. The winding coil 12 includes a first winding 111 and a second winding 112. The second winding 112 is arranged in parallel with the first winding 111, and the winding trajectory of the second winding 112 is parallel to the winding trajectory of the first winding 111. The coil formed by the above two windings can improve the flexibility of coil parameters and increase the effective wire length. Furthermore, the second winding 112 and the first winding 111 can be metal wire cores with an insulating layer. By adjusting the electrical connection between the second winding 112 and the first winding 111 to be parallel or series, different overall resistance values ​​can be formed to flexibly match different driving requirements. Moreover, the metal wire cores in the second winding 112 and the first winding 111 use different wire materials, such as different metal wire cores or different alloy contents, to balance conductivity and quality and obtain better output performance. The parallel winding of the coil assembly 100 increases the probability of achieving more turns in the magnetic gap, improves magnetic field utilization, increases effective wire length, and reduces harmonic distortion. When the coil assembly 100 is used as a voice coil and applied to a speaker module, the coil assembly 100 improves the dynamic performance of the diaphragm by optimizing the winding density and quality. The parallel winding of the coil assembly 100 can share the mechanical fatigue stress during vibration and reduce the risk of fatigue breakage of a single wire (single winding), especially in low-frequency, large-amplitude scenarios.

[0037] This application example uses a winding coil 12 including a first winding 111 and a second winding 112. In other embodiments, the winding coil 12 may also include three or more windings arranged in parallel, and the winding trajectories of these windings are parallel.

[0038] The following example illustrates the connection relationship between the first winding 111 and the second winding 112.

[0039] In the first optional embodiment where the first winding 111 and the second winding 112 are connected, please refer to Figure 8 The outer surface of the first winding 111 is bonded to the outer surface of the second winding 112 to form a frameless, self-shaping coil assembly 100.

[0040] Specifically, at least one of the first winding 111 and the second winding 112 is a self-adhesive winding. The self-adhesive winding includes a metal core, an insulation layer, and an adhesive layer arranged from the inside out.

[0041] Furthermore, the second winding 112 and the first winding 111 can be metal wire cores with an insulating layer. By adjusting the electrical connection between the second winding 112 and the first winding 111 to be parallel or series, different overall resistance values ​​can be formed to flexibly match different driving requirements. Moreover, the metal wire cores in the second winding 112 and the first winding 111 can be made of different wire materials, such as different metal wire cores or different alloy contents, to balance conductivity and quality and obtain better output performance.

[0042] Please see Figure 8 For example, the first winding 111 is a self-adhesive winding. The first winding 111 includes a first metal wire core 1111, a first insulating layer 1112, and a first adhesive layer 1113. The first insulating layer 1112 is disposed on the outer layer of the first metal wire core 1111, and the first adhesive layer 1113 is disposed on the outer layer of the first insulating layer 1112. The second winding 112 is a self-adhesive winding. The second winding 112 includes a second metal wire core 1121, a second insulating layer 1122, and a second adhesive layer 1123. The second insulating layer 1122 is disposed on the outer layer of the second metal wire core 1121, and the second adhesive layer 1123 is disposed on the outer layer of the second insulating layer 1122.

[0043] During the stroke of the first winding 111 and the second winding 112 being wound onto the winding shaft, the first adhesive layer 1113 and the second adhesive layer 1123 on the outer surface of the self-adhesive winding melt. The melted first adhesive layer 1113 and the second adhesive layer 1123 bond the outer surface of the first winding 111 and the outer surface of the second winding 112 together during the stroke of being wound onto the winding shaft, thereby achieving wire bonding.

[0044] For example, the first winding 111 is a self-adhesive winding. The first winding 111 includes a first metal wire core 1111, a first insulating layer 1112, and a first adhesive layer 1113. The first insulating layer 1112 is disposed on the outer layer of the first metal wire core 1111, and the first adhesive layer 1113 is disposed on the outer layer of the first insulating layer 1112. The second winding 112 is a non-self-adhesive winding. The second winding 112 includes a second metal wire core 1121 and a second insulating layer 1122. The second insulating layer 1122 is disposed on the outer layer of the second metal wire core 1121.

[0045] During the stroke of the first winding 111 and the second winding 112 being wound onto the winding shaft, the first adhesive layer 1113 on the outer surface of the self-adhesive winding melts. The first adhesive layer 1113 causes the outer surfaces of the first winding 111 and the second winding 112 to bond together during the stroke of being wound onto the winding shaft, thereby achieving wire bonding.

[0046] For example, the first winding 111 is a non-self-adhesive winding. The first winding 111 includes a first metal wire core 1111 and a first insulating layer 1112, with the first insulating layer 1112 disposed on the outer layer of the first metal wire core 1111. The second winding 112 is a self-adhesive winding. The second winding 112 includes a second metal wire core 1121, a second insulating layer 1122, and a second adhesive layer 1123. The second insulating layer 1122 is disposed on the outer layer of the second metal wire core 1121, and the second adhesive layer 1123 is disposed on the outer layer of the second insulating layer 1122.

[0047] During the stroke of the first winding 111 and the second winding 112 wound onto the winding shaft, the second adhesive layer 1123 on the outer surface of the self-adhesive winding melts. The melted second adhesive layer 1123 causes the outer surfaces of the first winding 111 and the second winding 112 to bond together during the stroke of winding onto the winding shaft, thereby achieving wire bonding.

[0048] In the second alternative embodiment where the first winding 111 and the second winding 112 are connected, the outer surface of the first winding 111 is bonded to the outer surface of the second winding 112 to form a frameless, self-shaping coil assembly 100.

[0049] Specifically, at least one of the first winding 111 and the second winding 112 is a self-adhesive winding. The self-adhesive winding includes a metal core, an insulating layer, and an adhesive layer arranged from the inside out. This embodiment differs from the first optional embodiment in that, during the winding process of the first winding 111 and the second winding 112 along the winding axis, the adhesive layer on the outer surface of the self-adhesive winding melts, thereby causing the first winding 111 and the second winding 112 to adhere together during the winding process, thus achieving wire bonding. The specific self-adhesive design of the first winding 111 and the second winding 112 can refer to the aforementioned first optional embodiment.

[0050] In the third optional embodiment where the first winding 111 and the second winding 112 are connected, the outer surface of the first winding 111 and the outer surface of the second winding 112 are connected as one unit.

[0051] Specifically, the first winding 111 and the second winding 112 are pre-formed, parallel double-wire strands. The outer layers of the first winding 111 and the second winding 112 are interconnected as a single structure, eliminating the need to fuse them together with adhesive during or before winding. This saves winding steps in the coil assembly 100, keeps the first winding 111 and the second winding 112 in close contact, and reduces the gap between them. Simultaneously, the first winding 111 and the second winding 112 exhibit good connection stability, reducing the risk of separation or misalignment during winding. Furthermore, since the first winding 111 and the second winding 112 are combined into a single wire, they can be fed out using the same feeding equipment.

[0052] In this embodiment, for example, both the first winding 111 and the second winding 112 are self-adhesive windings; further, both the first winding 111 and the second winding 112 are self-adhesive enameled wires. In other words, the first winding 111 is a first enameled wire, and the second winding 112 is a second enameled wire.

[0053] More specifically, the first winding 111 includes a first metal wire core 1111, a first insulating layer 1112, and a first adhesive layer 1113. The first insulating layer 1112 is disposed on the outer layer of the first metal wire core 1111, and the first adhesive layer 1113 is disposed on the outer layer of the first insulating layer 1112. The second winding 112 includes a second metal wire core 1121, a second insulating layer 1122, and a second adhesive layer 1123. The second insulating layer 1122 is disposed on the outer layer of the second metal wire core 1121, and the second adhesive layer 1123 is disposed on the outer layer of the second insulating layer 1122.

[0054] The outer periphery of the first winding 111 is an adhesive layer, and the outer periphery of the second winding 112 is an adhesive layer. In this way, the first winding 111 can be bonded to other windings adjacent to its outer periphery, and the second winding 112 can be bonded to other windings adjacent to its outer periphery. This makes it easier to bond and fix the first winding 111 and the second winding 112 together, and also makes it easier to bond and fix different winding coils 12 together, and different winding coil layers 13 together, so as to form a frameless and self-shaping (self-supporting) coil assembly 100.

[0055] In general, loudspeakers employ framed voice coils. The presence of the frame increases the weight of the vibrating components, reduces the speaker's transient response speed, affects high-frequency details, and may reduce the speaker's sensitivity. The frame occupies considerable height, resulting in low space utilization in miniature loudspeakers and making it unsuitable for space-constrained wearable headphone speakers. The manufacturing process of framed voice coils is complex, leading to slightly lower consistency. The rigidity of the frame components themselves and the additional resonances that may be introduced during assembly are detrimental to sound quality. The framed design also limits further miniaturization, and the simplification of mechanical suspensions and electromagnetic components during miniaturization may lead to reduced bandwidth and increased nonlinearity, thus affecting sound quality. Furthermore, metal frames (such as aluminum frames) generate eddy currents in changing magnetic fields. These eddy currents introduce additional distortion, leading to increased high-frequency distortion and potentially reducing the speaker's mechanical quality factor, affecting dynamic performance. Framed designs may sacrifice acoustic performance during miniaturization. For example, traditional manufacturing techniques struggle to achieve high dimensional accuracy and good reproducibility during miniaturization, thus impacting sound quality.

[0056] Based on this, the frameless coil assembly 100 provided in this application can be applied to frameless voice coils. Compared with framed electromagnetic coils, it has significant advantages in structural design and application performance, especially in the field of miniature loudspeakers. The frameless design eliminates the traditional voice coil skeleton material (such as kraft paper, polyimide, etc.), and is directly wound with enameled wire, significantly reducing the rotational inertia of the coil. This characteristic makes the coil response faster and the dynamic performance better, suitable for scenarios requiring high-frequency vibration. Frameless coils do not require reserved space for skeleton installation, and can be more compactly arranged in limited spaces, improving space utilization, especially suitable for miniaturized devices (such as mobile phones, headphones, and wearable devices) with strict size requirements. Traditional skeleton materials may hinder heat conduction, while frameless coils are directly exposed to the magnetic field, and heat can be quickly dissipated through copper wires, helping to reduce the temperature rise problem of miniature loudspeakers in enclosed environments (such as the coil temperature inside a mobile phone can reach 100°C), and improving heat dissipation performance. It also eliminates the skeleton manufacturing and assembly process, reducing material and production costs, while simplifying the winding process. The low inertia and high response speed of the frameless coil can drive the diaphragm vibration more precisely, reducing distortion, improving high-frequency details and transient response, and enhancing acoustic performance. Miniature loudspeakers are often limited in bass response and volume due to size constraints. The frameless design also partially alleviates the problem of increased resonant frequency caused by small size by reducing diaphragm load, thus enhancing low-frequency performance.

[0057] The following description, in conjunction with the accompanying drawings, illustrates the arrangement of the first winding 111 and the second winding 112 in the coil assembly 100.

[0058] For a first alternative embodiment of the arrangement of the first winding 111 and the second winding 112, please refer to [link to previous document]. Figure 4 The first winding 111 and the second winding 112 are arranged side by side along the winding axis (Z direction). The winding axis is the same as the aforementioned axis, which is also the Z direction in the figure, and can also be referred to as the longitudinal direction.

[0059] Specifically, along the winding axial direction, the first winding 111 and the second winding 112 are arranged along the winding axial direction. Taking the innermost coil layer as an example, during the winding process, the unwinding device arranges the first winding 111 and the second winding 112 along the winding axial direction and unwinds them close together. As the winding shaft rotates, the first winding 111 and the second winding 112 wrap around the winding shaft several times along a spiral trajectory to form the innermost winding coil layer 13. In the coil layer formed in this embodiment, along the winding axial direction, the first winding 111, the second winding 112, the first winding 111, the second winding 112... are arranged alternately in sequence.

[0060] This application does not specify the number of turns of the winding coil 12 in the winding coil layer 13.

[0061] Please see Figure 4 Alternatively, along the winding axis, each pair of adjacent turns of the winding coil 12 are bonded together to form a self-shaped coil assembly 100.

[0062] The winding section 10 is formed by winding the combined winding 11 in a spiral trajectory. During the process of winding the combined winding 11 around the winding axis multiple times, the surfaces of adjacent turns of the combined winding 11 are closely arranged and bonded together.

[0063] In this embodiment, please refer to Figure 4 The first winding 111 and the second winding 112 are defined to form the aforementioned combined winding 11. The bonding method between the first winding 111 and the second winding 112 in the combined winding 11 can refer to the first to third optional implementations of connecting the first winding 111 and the second winding 112 described above.

[0064] For details, please refer to Figure 4 Along the axial direction of the winding, the first winding 111 and the second winding 112 are arranged along the axial direction of the winding. Taking the first winding 111 being located above the second winding 112 as an example, along the axial direction of the winding, the first winding 111, the second winding 112, the first winding 111, the second winding 112... are arranged alternately in sequence. Among them, the second winding 112 in the previous winding coil 12 is closely attached to the first winding 111 in the next winding coil 12.

[0065] Taking the first winding 111 and the second winding 112 as self-adhesive windings as an example, during the process of winding the first winding 111 and the second winding 112 onto the winding shaft, the surfaces of the previous turn of the second winding 112 and the next turn of the first winding 111 that are currently in contact are locally heated, causing the adhesive layer on the surface of the previous turn of the second winding 112 to melt, and the adhesive layer on the surface of the next turn of the first winding 111 to melt, and an axial force is applied between the previous turn of the second winding 112 and the next turn of the first winding 111 that are currently in contact. The pressing force makes the surface of the second winding 112 of the previous turn and the surface of the first winding 111 of the next turn have a large contact area and a large adhesive area. After the molten adhesive layer cools, the surface of the second winding 112 of the previous turn and the surface of the first winding 111 of the next turn are bonded together, thereby improving the bonding strength between the winding coils 12 of adjacent turns. Each adjacent winding coil 12 is bonded, which can improve the shaping stability, shaping dimensional accuracy, vibration resistance, deformation resistance, and torsion resistance of the winding coil layer 13.

[0066] For a second optional arrangement of the first winding 111 and the second winding 112, please refer to [link / reference]. Figures 9-11 The first winding 111 and the second winding 112 are arranged side by side along the winding radial direction. The winding radial direction is the aforementioned radial direction, which is also the X direction in the figure, and can also be referred to as the transverse direction.

[0067] Specifically, along the radial direction of the winding, the first winding 111 and the second winding 112 are arranged in the radial direction of the winding. Taking the innermost coil layer as an example, during the winding process, the unwinding device arranges the first winding 111 and the second winding 112 along the radial direction of the winding and unwinds them close together. As the winding shaft rotates, the first winding 111 and the second winding 112 wrap around the winding shaft several times along a spiral trajectory to form the innermost winding coil layer 13. In the coil layer formed in this embodiment, along the radial direction of the winding, the first winding 111, the second winding 112, the first winding 111, the second winding 112... are arranged alternately in sequence.

[0068] This application does not specify the number of turns of the winding coil 12 in the winding coil layer 13.

[0069] Alternatively, along the winding axis, each pair of adjacent turns of the winding coil 12 are bonded together to form a self-shaped coil assembly 100.

[0070] The winding section 10 is formed by winding the combined winding 11 in a spiral trajectory. During the process of winding the combined winding 11 around the winding axis multiple times, the surfaces of adjacent turns of the combined winding 11 are closely arranged and bonded together.

[0071] In this embodiment, a first winding 111 and a second winding 112 are defined to form the aforementioned combined winding 11. The bonding method between the first winding 111 and the second winding 112 in the combined winding 11 can refer to the first to third optional implementations of connecting the first winding 111 and the second winding 112 described above.

[0072] Specifically, the first winding 111 and the second winding 112 are arranged along the radial direction of the windings. Taking the first winding 111 being located to the left of the second winding 112 as an example, along the axial direction of the windings, on the left side, the first winding 111, the first winding 111, the first winding 111, the first winding 111... are arranged in sequence, and on the right side, the second winding 112, the second winding 112, the second winding 112, the second winding 112... are arranged in sequence.

[0073] In this configuration, the first winding 111 in the previous winding coil 12 is closely fitted with the first winding 111 in the next winding coil 12, and the second winding 112 in the previous winding coil 12 is closely fitted with the second winding 112 in the next winding coil 12.

[0074] Taking a case where both the first winding 111 and the second winding 112 are self-adhesive windings, during the process of winding the first winding 111 and the second winding 112 onto the winding shaft, the surfaces of the previous winding 111, the second winding 112, and the next winding 111 and the second winding 112 that are currently in contact are locally heated. This causes the adhesive layer on the surface of the previous winding 111 to melt, the adhesive layer on the surface of the second winding 112 to melt, and the adhesive layer on the surface of the next winding 111 to melt, and the adhesive layer on the surface of the second winding 112 to melt. Furthermore, a longitudinally applied adhesive layer is applied between the contacting first winding 111 and the next winding 111, and between the contacting second winding 112 and the next winding 112. The pressing force increases the contact area and adhesive area between the surface of the first winding 111 of the previous turn and the surface of the first winding 111 of the next turn. At the same time, it also increases the contact area and adhesive area between the surface of the second winding 112 of the previous turn and the surface of the second winding 112 of the next turn. After the molten adhesive layer cools, it bonds the surfaces of the first winding 111 of the previous turn and the first winding 111 of the next turn together, and the surfaces of the second winding 112 of the previous turn and the second winding 112 of the next turn together. This improves the bonding strength between adjacent winding coils 12. Each adjacent winding coil 12 is bonded, which can improve the shaping stability, shaping dimensional accuracy, vibration resistance, deformation resistance, and torsional resistance of the winding coil layer 13.

[0075] For a third alternative implementation of the arrangement of the first winding 111 and the second winding 112, please refer to [link to relevant documentation]. Figure 12The first winding 111 and the second winding 112 are arranged side by side along the inclined direction. The line connecting the center of the transverse surface of the first winding 111 and the center of the transverse surface of the second winding 112 intersects both the aforementioned radial direction and the aforementioned axial direction.

[0076] In this embodiment, the first winding 111 and the second winding 112 are arranged side by side along an inclined direction. During the winding process, the second winding 112 of the previous turn can not only bond with the first winding 111 of the same turn, but also bond with the first winding 111 of the next turn and the second winding 112 of the next turn. In this way, the bonding area between each winding and other adjacent windings is increased, and the winding gap between each winding and other adjacent windings is reduced. This reduces the size of the coil assembly 100 in a limited space. For example, compared with the second optional embodiment of the arrangement of the first winding 111 and the second winding 112, the radial dimension of this embodiment is smaller, which is beneficial for molding into more miniaturized devices such as loudspeakers.

[0077] Of course, the bonding method between different turns of the winding coil 12 in this embodiment can refer to the bonding method between different turns of the winding coil 12 in the first optional first winding 111 and second winding 112 arrangement embodiment described above.

[0078] The above is an example of the combined winding 11 including a first winding 111 and a second winding 112. In other embodiments, the combined winding 11 may also include three windings, wherein the arrangement of the three windings may be in addition to the arrangement of the two windings mentioned above, and the arrangement of the three windings may also be at least one of the following: L-shaped, V-shaped, triangular, etc.

[0079] In other embodiments, the combined winding 11 may further include four windings. The arrangement of the four windings may be in addition to the arrangement of the two windings described above, and may also be at least one of the following: U-shaped, C-shaped, L-shaped, T-shaped, Z-shaped, L-shaped, or square-shaped. The combined winding 11 may also include five or more windings, and their arrangement may be designed with reference to the embodiments described in this application.

[0080] Generally, the topology of voice coil winding is simple and traditional, lacking flexibility, which limits the design of parameters such as winding width, wire length, and wire arrangement. The innovative voice coil topology provided in this application forms a frameless voice coil structure by designing and combining the winding wires 11, increasing the effective wire length of the voice coil and improving the flexibility of adjusting the voice coil parameters. When the coil assembly 100 is used as a voice coil in a speaker module, the coil assembly 100 improves the dynamic performance of the diaphragm by optimizing the winding density and quality; the coil assembly 100 uses dual wires wound in parallel to share the mechanical fatigue stress during vibration, reducing the risk of fatigue breakage of a single wire (single winding), especially in low-frequency, high-amplitude scenarios.

[0081] This application does not specify the number of winding coil layers 13 in the winding section 10.

[0082] Optional, please refer to Figure 4 , Figure 10 and Figure 12 The winding coil layer 13 has one layer. The arrangement of the combined winding coil 11, etc., can be referred to the aforementioned description.

[0083] Alternatively, please refer to Figure 6 The number of winding coil layers 13 is at least two. Adjacent winding coil layers 13 are bonded together along the radial direction of the winding.

[0084] As mentioned above, in the same layer, in the longitudinal direction, the winding coils 12 of adjacent layers are bonded and fixed together for shaping. Furthermore, in the process of winding the multi-layer coil assembly 100, the adjacent winding coil layers 13 of the outer and inner layers are also bonded and fixed together for shaping, so as to form a frameless and self-supporting coil assembly 100.

[0085] Taking a case where both the first winding 111 and the second winding 112 are self-adhesive windings, after the inner layer combined winding 11 is wound on the winding shaft, during the process of the outer layer combined winding 11 winding around the outer periphery of the inner layer combined winding 11, the surfaces of the inner layer combined winding 11 and the outer layer combined winding 11 that are in contact are locally heated, causing the adhesive layer on the surface of the inner layer combined winding 11 to melt, and the adhesive layer on the surface of the outer layer combined winding 11 to melt, thus affecting the contact between the inner layer combined winding 11 and the outer layer combined winding 11. Applying radial pressure between the inner and outer layers of the combined winding 11 results in a larger contact area and adhesive area between the inner and outer layers of the combined winding 11. After the molten adhesive layer cools, it bonds the surfaces of the inner and outer layers of the combined winding 11 together, thereby increasing the bonding strength between adjacent winding coil layers 13. Each adjacent inner and outer winding coil layer 13 is bonded, which can improve the shaping stability, dimensional accuracy, vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0086] This application does not impose specific limitations on the arrangement of the winding coil layers 13 between adjacent layers.

[0087] For the first optional arrangement of the inner and outer winding coil layers 13, please refer to [link / reference needed]. Figure 6 The two adjacent winding coil layers 13 are arranged flush with each other in the radial direction.

[0088] Please see Figure 6 This embodiment can be combined with the aforementioned first optional arrangement of the first winding 111 and the second winding 112. In the combined winding 11, the first winding 111 and the second winding 112 can be arranged side by side along the winding axis. The inner layer's first winding 111 and the outer layer's first winding 111 are radially aligned. Further, the center of the cross-section of the inner layer's first winding 111 is radially aligned with the center of the cross-section of the outer layer's first winding 111. The inner layer's second winding 112 and the outer layer's second winding 112 are radially aligned. Further, the center of the cross-section of the inner layer's second winding 112 is radially aligned with the center of the cross-section of the outer layer's second winding 112.

[0089] This embodiment can also be combined with the aforementioned second optional arrangement of the first winding 111 and the second winding 112. In the combined winding 11, the first winding 111 and the second winding 112 can be arranged side by side along the winding radially. The second winding 112 of the inner layer is radially aligned with the first winding 111 of the outer layer. Furthermore, the center of the cross-section of the second winding 112 of the inner layer is radially aligned with the center of the cross-section of the first winding 111 of the outer layer.

[0090] This embodiment can also be combined with the aforementioned third optional embodiment of arranging the first winding 111 and the second winding 112.

[0091] For the second optional arrangement of the inner and outer winding coil layers 13, please refer to [link / reference needed]. Figures 13-15 The adjacent winding coil layers 13 are staggered. Since the cross-section of the winding is circular or other shapes, a groove is formed where two adjacent windings meet, and this groove is also where the winding gap is formed. In this embodiment, by designing the adjacent winding coil layers 13 to be staggered, a portion of the outer layer's winding can be placed in the groove formed by the meeting of adjacent inner layer windings. This reduces the winding gap, increases the contact area and bonding area between the windings, and also reduces the overall radial dimension of the inner and outer winding coil layers 13, thus reducing the width of the coil assembly 100 and the space occupied by the coil assembly 100. The coil assembly 100 can then be applied to miniaturized or micro-sized speaker modules.

[0092] In the first case, please refer to Figure 13This embodiment combines the aforementioned first optional arrangement of the first winding 111 and the second winding 112. Specifically, the winding portion 10 includes a first winding coil layer 131 and a second winding coil layer 132 arranged radially adjacent to each other along the winding. The first winding coil layer 131 is located within the second winding coil layer 132.

[0093] In the first winding coil layer 131, the first winding 111 and the second winding 112 are arranged side by side along the winding axis. In the second winding coil layer 132, the first winding 111 and the second winding 112 are arranged side by side along the winding axis. In each winding coil layer 13, along the winding axis, the first winding 111, the second winding 112, the first winding 111, the second winding 112, and so on are arranged alternately. Adjacent winding coil layers 13 are staggered.

[0094] Optionally, at least a portion of the first winding 111 in the first winding layer 131 is embedded in a groove formed by the first winding 111 and the second winding 112 in the second winding layer 132. At least a portion of the second winding 112 in the first winding layer 131 is embedded in a groove formed by the second winding 112 and the first winding 111 in another set of the second winding 112 in the second winding layer 132.

[0095] For a further example, the first winding 111 of the inner first ring is located in the groove formed by the first winding 111 and the second winding 112 of the outer first ring; the second winding 112 of the outer first ring is located in the groove formed by the first winding 111 and the second winding 112 of the inner first ring; the second winding 112 of the inner first ring is located in the groove formed by the second winding 112 of the outer first ring and the first winding 111 of the second ring; and the first winding 111 of the outer second ring is located in the groove formed by the second winding 112 of the inner first ring and the second winding 111 of the second ring. In the groove formed by the connection between the winding 112 and the first winding 111 of the second turn, the first winding coil layer 131 and the second winding coil layer 132 are interlocked, so that the windings in the first winding coil layer 131 are tightly attached to each other, increasing the bonding area between the windings in the first winding coil layer 131, reducing the winding gap, and improving the shaping stability, shaping dimensional accuracy, vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0096] In the second case, please refer to Figure 14 and Figure 15 This embodiment can also be combined with the first optional embodiment and the second optional embodiment of the arrangement of the first winding 111 and the second winding 112 described above.

[0097] Specifically, the winding portion 10 includes a first winding coil layer 131 and a second winding coil layer 132 arranged radially adjacent to each other along the winding. The first winding coil layer 131 is located inside the second winding coil layer 132.

[0098] In the first winding coil layer 131, the first winding 111 and the second winding 112 are arranged side by side along the winding axis. In each winding coil layer 13, along the winding axis, the first winding 111, the second winding 112, the first winding 111, the second winding 112... are arranged alternately in sequence.

[0099] In the second winding coil layer 132, the first winding 111 and the second winding 112 are arranged side by side along the winding radial direction. Taking the first winding 111 being located to the left of the second winding 112 as an example, along the winding axial direction, on the left side, the first winding 111, the first winding 111, the first winding 111, the first winding 111... are arranged in sequence, and on the right side, the second winding 112, the second winding 112, the second winding 112, the second winding 112... are arranged in sequence.

[0100] The two adjacent winding coil layers 13 are staggered.

[0101] Optionally, the first winding coil layer 131 and the second winding coil layer 132 are bonded together. The first winding coil layer 131 can bind two adjacent turns of the winding coil 12 in the second winding coil layer 132 in the axial direction, and the second winding coil layer 132 can bind two adjacent turns of the winding coil 12 in the first winding coil layer 131 in the axial direction, thereby improving the vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0102] Understandably, the radial width of the windings in the first winding layer 131 and the second winding layer 132 is the sum of the diameters of the three windings.

[0103] Optionally, at least a portion of the first winding 111 in the first winding layer 131 is located in a groove formed by two adjacent first windings 111 in the second winding layer 132. At least a portion of the second winding 112 in the first winding layer 131 is located in a groove formed by another two adjacent first windings 111 in the second winding layer 132.

[0104] For a further example, the first winding 111 of the inner first ring is located in the groove formed by the first winding 111 of the outer first ring and the first winding 111 of the second ring; the first winding 111 of the outer second ring is located in the groove formed by the first winding 111 of the inner first ring and the second winding 112; the second winding 112 of the inner first ring is located in the groove formed by the first winding 111 of the outer second ring and the first winding 111 of the third ring; and the first winding 111 of the outer third ring is located in the groove formed by the first winding 111 of the inner first ring... In the groove formed by the second winding 112 and the first winding 111 of the second turn, the first winding coil layer 131 and the second winding coil layer 132 are interlocked, so that the windings in the first winding coil layer 131 are tightly attached to each other, increasing the bonding area between the windings in the first winding coil layer 131, reducing the winding gap, and improving the shaping stability, shaping dimensional accuracy, vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0105] Alternatively, both the first winding 111 and the second winding 112 may be self-adhesive windings.

[0106] Please see Figure 11 , Figure 14 and Figure 15 The first winding 111 includes a first metal wire core 1111, a first insulating layer 1112, and a first adhesive layer 1113. The first insulating layer 1112 is disposed on the outer layer of the first metal wire core 1111. The first adhesive layer 1113 is disposed on the outer layer of the first insulating layer 1112. The second winding 112 includes a second metal wire core 1121, a second insulating layer 1122, and a second adhesive layer 1123. The second insulating layer 1122 is disposed on the outer layer of the second metal wire core 1121. The second adhesive layer 1123 is disposed on the outer layer of the second insulating layer 1122. The first adhesive layer 1113 of the first winding 111 can be bonded to the second adhesive layer 1123 of the adjacent second winding 112. Further, the first adhesive layer 1113 of the first winding 111 can be bonded to the first adhesive layer 1113 of the adjacent first winding 111. Furthermore, the second adhesive layer 1123 of the second winding 112 can be bonded to the second adhesive layer 1123 of the adjacent second winding 112.

[0107] In this embodiment, the first winding 111 and the second winding 112 of the combined winding 11, the two axially adjacent winding coils 12, and the two radially adjacent winding coil layers 13 can all be bonded, cured, and shaped by adhesive layers. This allows the coil assembly 100 provided in this embodiment to have multiple layers of coils, as well as strong structural strength, a relatively large winding bonding area, and a relatively small winding gap. This improves the shaping stability, shaping dimensional accuracy, vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0108] This application does not specifically limit the thickness between the first adhesive layer 1113 and the second adhesive layer 1123. Optionally, the adhesive layer can fill the winding gap after melting, further increasing the bonding area between the windings and further improving the structural strength, shaping stability, shaping dimensional accuracy, vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0109] The above describes the arrangement between the two winding coil layers 13. In other embodiments, the number of winding coil layers 13 in the coil assembly 100 may be three or more.

[0110] Optionally, the electrical connection between the parallel windings can be in parallel, in series, or in a combination of both. The following provides specific examples of parallel windings.

[0111] In conjunction with any of the foregoing embodiments, please refer to Figure 16 The first winding 111 includes a first input terminal 1114 and a first output terminal 1115. The second winding 112 includes a second input terminal 1124 and a second output terminal 1125.

[0112] For the first alternative implementation, please refer to Figure 16 The first input terminal 1114 is electrically connected to the second input terminal 1124, and the first output terminal 1115 is electrically connected to the second output terminal 1125. In other words, the first winding 111 and the second winding 112 are connected in parallel, which reduces the DC resistance of the coil assembly 100 and achieves higher power at the same voltage. When the coil assembly 100 is applied to a voice coil, it enables the voice coil to obtain a high sound pressure level, improves the dynamic range, and further enhances the sensitivity of the voice coil.

[0113] The first input terminal 1114 and the first output terminal 1115 are used for electrical connection to a first controller. The first controller can provide operating voltage to the coil assembly 100. The first controller includes, but is not limited to, a voice coil driver chip, etc.

[0114] For the second alternative implementation, please refer to... Figure 17 The first output terminal 1115 is electrically connected to the second input terminal 1124. In other words, the first winding 111 and the second winding 112 are connected in series. When the coil assembly 100 is applied to the voice coil, it can reduce voice coil distortion, adapt to different load requirements, and improve system compatibility.

[0115] The first input terminal 1114 and the second output terminal 1125 are used for electrical connection to the first controller 41. The first controller 41 can provide operating voltage to the coil assembly 100. The first controller 41 includes, but is not limited to, a voice coil driver chip, etc.

[0116] For a third alternative implementation, please refer to... Figure 18 The first input terminal 1114 and the first output terminal 1115 are electrically connected to the first controller 41. The second input terminal 1124 and the second output terminal 1125 are electrically connected to the second controller 42. In other words, the first winding 111 and the second winding 112 are driven independently.

[0117] The first controller 41 and the second controller 42 can be independently operating voice coil driver chips. In other words, the first winding 111 and the second winding 112 can be controlled by independent voice coil driver chips, enabling independent driving of the first winding 111 and the second winding 112, resulting in more intelligent control, improved voice coil driving force, and the best tuning effect.

[0118] When the number of parallel windings in the combined winding 11 is three or more, by designing the electrical connection scheme between the multiple windings, coil assemblies 100 with various resistance values ​​can be formed, thereby improving the resistance value adaptation range of the coil assembly 100. Different winding electrical connection methods can be adjusted according to the voice coil driver chip to form a voice coil resistance value that is compatible with the voice coil driver chip, thereby improving the compatibility of the coil assembly 100 and improving the voice coil performance.

[0119] Furthermore, the second winding 112 and the first winding 111 can be metal wire cores with an insulating layer. By adjusting the electrical connection between the second winding 112 and the first winding 111 to be parallel or series, different overall resistance values ​​can be formed to flexibly match different driving requirements. Moreover, the metal wire cores in the second winding 112 and the first winding 111 can be made of different wire materials, such as different metal wire cores or different alloy contents, to balance conductivity and quality and obtain better output performance.

[0120] Optionally, the first input terminal 1114 and the second output terminal 1125 are located on opposite sides of the axial direction of the coil assembly 100. In other words, the signal input and signal output terminals of the coil assembly 100 can be led out on opposite sides of the axial direction.

[0121] Alternatively, the first input terminal 1114 and the second output terminal 1125 are located on the same side of the coil assembly 100. In other words, the signal input terminal and signal output terminal of the coil assembly 100 can be led out from the same side.

[0122] In some scenarios, a longer effective winding length is required, for example, an effective winding length of three winding diameters is required, while the signal input and signal output terminals of the coil assembly 100 can be led out on the same side.

[0123] Generally, if the coil assembly 100 is formed by winding a single wire, when the radial width of the winding of the coil layer 13 is the sum of the diameter widths of the three windings, it is necessary to wind from the top to the bottom along the axis in the first layer, then from the bottom to the top in the second layer, and then from the top to the bottom in the third layer. In this way, the signal input terminal and the signal output terminal of the coil assembly 100 are led out on both sides of the axis, which cannot meet the above requirements.

[0124] In this embodiment, if the coil assembly 100 is formed by double winding, when the radial width of the winding in the coil layer 13 is the sum of the diameters of the three windings, it needs to be wound axially from the top to the bottom in the first layer (double windings arranged longitudinally side by side), and then wound axially from the bottom to the top in the second layer (double windings arranged laterally side by side). In this way, the signal input and signal output terminals of the coil assembly 100 can be led out from the same side. This satisfies the requirement for a longer effective winding length, for example, an effective winding length of three winding diameters, while also ensuring that the signal input and signal output terminals of the coil assembly 100 can be led out from the same side.

[0125] Compared to conventional techniques, the topology of voice coil winding is simple and traditional, lacking flexibility, which limits the design of parameters such as winding width, wire length, and wire arrangement. The innovative voice coil topology provided in this application, through the design and combination of winding wires 11 to form a frameless voice coil structure, increases the effective wire length of the voice coil, improves the overall sound pressure level, and enhances the flexibility of adjusting voice coil parameters.

[0126] In the third case, please refer to Figure 19 This embodiment can also be combined with the first optional embodiment and the second optional embodiment of the arrangement of the first winding 111 and the second winding 112 described above.

[0127] For details, please refer to Figure 19 The winding portion 10 includes a first winding coil layer 131 and a second winding coil layer 132 arranged radially adjacent to each other along the winding. The first winding coil layer 131 is located outside the second winding coil layer 132. This embodiment can be referred to the embodiment of the second case described above.

[0128] Please see Figure 19 In the first winding coil layer 131, the first winding 111 and the second winding 112 are arranged side by side along the winding radial direction. Taking the first winding 111 being located to the left of the second winding 112 as an example, along the winding axial direction, on the left side, the first winding 111, the first winding 111, the first winding 111, the first winding 111... are arranged in sequence, and on the right side, the second winding 112, the second winding 112, the second winding 112, the second winding 112... are arranged in sequence.

[0129] In the second winding coil layer 132, the first winding 111 and the second winding 112 are arranged side by side along the winding axis. In each winding coil layer 13, along the winding axis, the first winding 111, the second winding 112, the first winding 111, the second winding 112... are arranged alternately in sequence.

[0130] The two adjacent winding coil layers 13 are staggered.

[0131] Optionally, the first winding coil layer 131 and the second winding coil layer 132 are bonded together. The first winding coil layer 131 can bind two adjacent turns of the winding coil 12 in the second winding coil layer 132 in the axial direction, and the second winding coil layer 132 can bind two adjacent turns of the winding coil 12 in the first winding coil layer 131 in the axial direction, thereby improving the vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0132] Understandably, the radial width of the windings in the first winding layer 131 and the second winding layer 132 is the sum of the diameters of the three windings.

[0133] Further optionally, at least a portion of the second winding 112 in the first winding layer 131 is located in the groove formed by the first winding 111 and the second winding 112 in the second winding layer 132.

[0134] The first winding coil layer 131 and the second winding coil layer 132 are interlocked, so that the windings in the first winding coil layer 131 are closely attached to each other, increasing the bonding area between the windings in the first winding coil layer 131 and reducing the winding gap, thereby improving the shaping stability, shaping dimensional accuracy, vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0135] Alternatively, both the first winding 111 and the second winding 112 may be self-adhesive windings.

[0136] In this embodiment, the first winding 111 and the second winding 112 of the combined winding 11, the two axially adjacent winding coils 12, and the two radially adjacent winding coil layers 13 can all be bonded, cured, and shaped by adhesive layers. This allows the coil assembly 100 provided in this embodiment to have multiple layers of coils, as well as strong structural strength, a relatively large winding bonding area, and a relatively small winding gap. This improves the shaping stability, shaping dimensional accuracy, vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0137] This application does not specifically limit the thickness between the first adhesive layer 1113 and the second adhesive layer 1123. Optionally, the adhesive layer can fill the winding gap after melting, further increasing the bonding area between the windings and further improving the structural strength, shaping stability, shaping dimensional accuracy, vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0138] In this embodiment, the electrical connection between the parallel windings can be in parallel, in series, or in a combination of partial series and partial parallel connection. For details, please refer to the relevant description in the second case.

[0139] In this embodiment, if the coil assembly 100 is formed by double winding, when the radial width of the winding in the coil layer 13 is the sum of the diameters of the three windings, it needs to be wound axially from the top to the bottom in the first layer (double windings arranged longitudinally side by side), and then wound axially from the bottom to the top in the second layer (double windings arranged laterally side by side). In this way, the signal input and signal output terminals of the coil assembly 100 can be led out from the same side. This satisfies the requirement for a longer effective winding length, for example, an effective winding length of three winding diameters, while also ensuring that the signal input and signal output terminals of the coil assembly 100 can be led out from the same side.

[0140] Please see Figure 20 Embodiment 2 of this application provides a coil assembly 100. The coil assembly 100 includes an inlet end 20, a winding portion 10, and an outlet end 30. The inlet end 20 and the outlet end 30 are located on the same side of the winding portion 10. The winding portion 10 has an odd number of wire layers along the radial direction. The number of wire layers refers to the number of wires wound radially.

[0141] Alternatively, the winding portion 10 may be formed by winding a combination of windings 11. Furthermore, the structure, arrangement, and arrangement of the combination of windings 11 in adjacent layers can all refer to the coil assembly 100 in Embodiment 1.

[0142] Further optional information can be found in [link to relevant documentation]. Figure 20 The combined winding 11 includes a first winding 111 and a second winding 112 arranged in parallel.

[0143] For example, please see Figure 20 Specifically, the winding portion 10 includes a first winding coil layer 131 and a second winding coil layer 132 arranged radially adjacent to each other along the winding. The first winding coil layer 131 is located inside the second winding coil layer 132.

[0144] In the first winding coil layer 131, the first winding 111 and the second winding 112 are arranged side by side along the winding axis. In each winding coil layer 13, along the winding axis, the first winding 111, the second winding 112, the first winding 111, the second winding 112... are arranged alternately in sequence.

[0145] In the second winding coil layer 132, the first winding 111 and the second winding 112 are arranged side by side along the winding radial direction. Taking the first winding 111 being located to the left of the second winding 112 as an example, along the winding axial direction, on the left side, the first winding 111, the first winding 111, the first winding 111, the first winding 111... are arranged in sequence, and on the right side, the second winding 112, the second winding 112, the second winding 112, the second winding 112... are arranged in sequence.

[0146] The two adjacent winding coil layers 13 are staggered.

[0147] Optionally, the first winding coil layer 131 and the second winding coil layer 132 are bonded together. The first winding coil layer 131 can bind two adjacent turns of the winding coil 12 in the second winding coil layer 132 in the axial direction, and the second winding coil layer 132 can bind two adjacent turns of the winding coil 12 in the first winding coil layer 131 in the axial direction, thereby improving the vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0148] Understandably, the radial width of the first winding coil layer 131 and the second winding coil layer 132 is the sum of the diameter widths of the three winding coils. The winding portion 10 has three layers in the radial direction.

[0149] For another example, the winding portion 10 includes a first winding coil layer 131 and a second winding coil layer 132 disposed adjacent to each other along the radial direction of the winding. The first winding coil layer 131 is located outside the second winding coil layer 132. This embodiment can be referred to the embodiment of the second case described above.

[0150] Specifically, in the first winding coil layer 131, the first winding 111 and the second winding 112 are arranged side by side along the winding radial direction. Taking the first winding 111 being located to the left of the second winding 112 as an example, along the winding axial direction, on the left side, the first winding 111, the first winding 111, the first winding 111, the first winding 111... are arranged sequentially, and on the right side, the second winding 112, the second winding 112, the second winding 112, the second winding 112... are arranged sequentially.

[0151] In the second winding coil layer 132, the first winding 111 and the second winding 112 are arranged side by side along the winding axis. In each winding coil layer 13, along the winding axis, the first winding 111, the second winding 112, the first winding 111, the second winding 112... are arranged alternately in sequence.

[0152] The two adjacent winding coil layers 13 are staggered.

[0153] Optionally, the first winding coil layer 131 and the second winding coil layer 132 are bonded together. The first winding coil layer 131 can bind two adjacent turns of the winding coil 12 in the second winding coil layer 132 in the axial direction, and the second winding coil layer 132 can bind two adjacent turns of the winding coil 12 in the first winding coil layer 131 in the axial direction, thereby improving the vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0154] Understandably, the radial width of the first winding coil layer 131 and the second winding coil layer 132 is the sum of the diameter widths of the three winding coils. The winding portion 10 has three layers in the radial direction.

[0155] Of course, the number of radial layers in the winding section 10 can also be other odd numbers, such as 5, 7, etc.

[0156] In conventional technology, in a single-wire wound coil assembly 100 with an odd number of winding layers, the input terminal 20 and output terminal 30 of the coil assembly 100 are led out from both axial ends of the coil assembly 100. However, this arrangement necessitates that the signal interface from the voice coil driver chip be located on both axial sides of the coil assembly 100, resulting in a complex layout and low efficiency.

[0157] Furthermore, if the coil assembly 100 is formed by winding a single wire, when the radial width of the winding of the coil layer 13 is the sum of the diameter widths of the three windings, it is necessary to wind from the top to the bottom along the axial direction in the first layer, then from the bottom to the top in the second layer, and then from the top to the bottom in the third layer. In this way, the signal input terminal and the signal output terminal of the coil assembly 100 are led out on both sides of the axial direction, which cannot meet the above requirements.

[0158] The coil assembly 100 provided in this application includes an inlet end 20, a winding section 10, and an outlet end 30. The inlet end 20 and the outlet end 30 are located on the same side of the winding section 10, and the winding section 10 has an odd number of radial layers. When the radial width of the winding coil layer 13 is the sum of the diameters of three windings, it is necessary to wind the coil from the top to the bottom in the first layer (two windings arranged longitudinally side by side), and then wind it from the bottom to the top in the second layer (two windings arranged laterally side by side). In this way, the signal input and signal output ends of the coil assembly 100 can be led out from the same side, which not only meets the requirement of a longer effective winding length, for example, the effective winding length of three winding diameters, but also satisfies the requirement that the signal input and signal output ends of the coil assembly 100 can be led out from the same side.

[0159] Compared to conventional techniques, the topology of voice coil winding is simple and traditional, lacking flexibility, which limits the design of parameters such as winding width, wire length, and wire arrangement. The innovative voice coil topology provided in this application, through the design and combination of winding wires 11 to form a frameless voice coil structure, increases the effective wire length of the voice coil, improves the overall sound pressure level, and enhances the flexibility of adjusting voice coil parameters.

[0160] Further optional information can be found in [link to relevant documentation]. Figure 20 The winding section 10 includes a first winding coil layer 131 and a second winding coil layer 132 arranged adjacent to each other along the winding coil radially. Each winding coil layer 13 has at least two winding coils 12 arranged side-by-side. At least two winding coils in the first winding coil layer 131 are arranged side-by-side along the winding coil axial direction. At least two winding coils in the second winding coil layer 132 are arranged side-by-side along the winding coil radially. For related content in this embodiment, please refer to the relevant content in the aforementioned Embodiment 1.

[0161] Optionally, the windings in the first winding coil layer 131 are embedded in the groove formed by the connection of two windings in the second winding coil layer 132. Each pair of adjacent turns of the winding coil 12 is bonded together. For related content in this embodiment, please refer to the relevant content in the aforementioned Embodiment 1.

[0162] The first winding coil layer 131 and the second winding coil layer 132 are interlocked, so that the windings in the first winding coil layer 131 are closely attached to each other, increasing the bonding area between the windings in the first winding coil layer 131 and reducing the winding gap, thereby improving the shaping stability, shaping dimensional accuracy, vibration resistance, deformation resistance, and torsion resistance of the coil assembly 100.

[0163] Alternatively, both the first winding 111 and the second winding 112 may be self-adhesive windings.

[0164] Please see Figure 21 This application provides a loudspeaker module 200. The loudspeaker module 200 includes a diaphragm 210, a magnet assembly 220, and a coil assembly 100 as described in any of the foregoing embodiments. The coil assembly 100 is a voice coil, and one end of the coil assembly 100 along the axial direction is connected to one side of the diaphragm 210.

[0165] Please see Figure 21 The magnet assembly 220 further includes an inner magnet 221 and an outer magnet 222. The outer magnet 222 is disposed on the outer periphery of the inner magnet 221. An annular gap 223 exists between the outer magnet 222 and the inner magnet 221. The coil assembly 100 is disposed in the annular gap 223. The coil assembly 100 is arranged around the outer periphery of the inner magnet 221.

[0166] Optionally, the winding of the coil assembly 100 is self-adhesive. The outermost layer of the winding of the coil assembly 100 is an adhesive layer. By melting the adhesive layer of the winding of the coil assembly 100 and bonding it to the diaphragm 210, the coil assembly 100 can drive the diaphragm 210 to vibrate more precisely, reduce distortion, improve high-frequency details and transient performance, enhance acoustic performance, and also improve the response speed and dynamic performance of the coil assembly 100.

[0167] When the coil assembly 100 is used as a voice coil in a speaker module, the coil assembly 100 improves the dynamic performance of the diaphragm by optimizing the winding density and quality. The coil assembly 100 uses dual wires wound in parallel to share the mechanical fatigue stress during vibration, reducing the risk of fatigue breakage of a single wire (single winding), especially in low-frequency, high-amplitude scenarios.

[0168] This application provides an earphone, including a coil assembly 100 as described in any of the foregoing embodiments; or, including a speaker module 200 as described in any of the foregoing embodiments.

[0169] This application provides an electronic device, including a coil assembly 100 as described in any of the foregoing embodiments; or, including a speaker module 200 as described in any of the foregoing embodiments.

[0170] Electronic devices include, but are not limited to, devices such as mobile phones, tablets, and wearable products (smartwatches, smart glasses, etc.) that have speaker modules 200 and microphones.

[0171] In conventional technologies, voice coils are wound from a single wire. Due to the size limitations of loudspeakers, the effective length of the voice coil is relatively small, resulting in low sound pressure sensitivity. While multi-voice coil arrays can optimize voice coil efficiency and increase wire length, single-wire winding of multiple independent voice coil arrays requires significant space, making them unsuitable for small products. They are also prone to generating abnormal vibration modes; the manufacturing process is complex, involving increased bonding and welding steps, making quality control difficult. In general, the enameled wire in a voice coil is wound on a frame. When used in miniature loudspeakers (such as TWS / OWS headphones), this increases the overall mass of the voice coil, reduces the speaker's transient response speed, and affects high-frequency details. The frame occupies a significant amount of height, resulting in low space utilization in miniature loudspeakers and making it unsuitable for space-constrained wearable headphone speakers. The manufacturing process of the frame voice coil is complex, leading to slightly inconsistent performance. The rigidity of the frame material and potential additional resonances introduced during assembly negatively impact sound quality. The traditional and limited topology of the wound voice coil restricts the design of parameters such as winding width, wire length, and wire arrangement.

[0172] The coil assembly 100 provided in this application can be a voice coil. As a key component in a loudspeaker, the voice coil converts electrical signals into mechanical motion, driving the diaphragm to generate sound. Its design affects efficiency and transduction. Voice coils can be used in wearable products such as headphones and smart glasses.

[0173] For example, this application provides a frameless voice coil, the combined winding 11 of which includes two enameled wires. Each enameled wire includes a metal layer, an insulating layer, and an adhesive layer. The enameled wires are bonded together by the adhesive layer. The frameless voice coil can be formed by winding two enameled wires side-by-side into a single unit. The frameless voice coil includes a first enameled wire and a second enameled wire, arranged adjacent to each other. Before winding, the first and second enameled wires can be combined into one wire (bonded by the adhesive layer); alternatively, they can be combined during winding, for example, winding one side while melting the other, with the first and second enameled wires tightly adjacent and maintaining a consistent trajectory. The frameless voice coil is shaped through winding and temperature control.

[0174] The outer layer of the enameled wire has an adhesive layer, which facilitates the all-round bonding of each enameled wire when multiple layers of wires are bonded together. The bonding is very strong, the consistency is better, and the voice coil is more stable in shape.

[0175] For example, the first option is to wind two wires vertically, starting from the top and winding the first horizontal layer to the end, then returning to the top to complete the second horizontal layer. Depending on the requirements, the third and fourth layers can be completed in sequence, returning to the top. The input and output wires are on the same side (same as the top). Depending on the design requirements, it can be a 2-layer coil or a 4-layer voice coil.

[0176] For example, the second option is to use two wires wound vertically. After the wires enter from the top, the first layer is wound horizontally to the end. Then, the two wires are changed to a horizontal arrangement and wound layer by layer back to the top to complete the second layer of horizontal winding. The incoming and outgoing wires are on the same side (same as the top). This is a 3-layer voice coil structure design, which can output an odd number of horizontal layers. Alternatively, after the first layer of horizontal winding is completed, the two wires can be turned to a vertical arrangement and wound layer by layer back to the top layer.

[0177] The frameless voice coil can be formed by two enameled wires interlaced. The innovative voice coil topology provided in this application is flexibly designed, which improves the flexibility of adjusting the voice coil parameters, increases the effective line length of the voice coil, enhances the overall sound pressure, and increases the driving force of the voice coil driving the diaphragm 210.

[0178] This application's embodiments, through flexible impedance matching and parallel connection of parallel windings, can reduce DC resistance, obtain higher power under the same voltage, achieve high sound pressure levels, and improve dynamic range. The series connection of parallel windings in this application's embodiments reduces distortion, adapts to different load requirements, and improves system compatibility. Optionally, at the application end, precise DSP driving of the first and second enameled wires allows for more intelligent control, achieving the best tuning effect. The frameless voice coil provided in this application can be formed by winding two enameled wires in parallel into a single voice coil. The innovative voice coil topology design allows for flexible adjustment of voice coil parameters through flexible impedance matching.

[0179] Any changes, modifications, substitutions, and variations to the above embodiments are also considered to be within the scope of protection of this application.

Claims

1. A coil assembly, characterized in that, The coil assembly includes a hollow cylindrical winding portion, the winding portion including at least one winding coil layer, the winding coil layer including multiple turns of winding coil arranged axially, the winding coil including: First winding; The second winding is arranged in parallel with the first winding, and the winding trajectory of the second winding is parallel to the winding trajectory of the first winding.

2. The coil assembly as claimed in claim 1, characterized in that, The outer surface of the first winding is bonded to the outer surface of the second winding; or, the outer surface of the first winding is connected to the outer surface of the second winding as a single unit.

3. The coil assembly as claimed in claim 1, characterized in that, The first winding and the second winding are arranged side by side along the winding axis.

4. The coil assembly as claimed in claim 3, characterized in that, Along the axial direction of the winding, each pair of adjacent turns of the winding is bonded together.

5. The coil assembly as claimed in claim 1, characterized in that, The first winding and the second winding are arranged side by side along the radial direction of the winding.

6. The coil assembly as claimed in claim 5, characterized in that, Along the axial direction of the winding, each pair of adjacent turns of the winding is bonded together.

7. The coil assembly as claimed in claim 1, characterized in that, The number of winding coil layers is at least two, and adjacent winding coil layers are bonded together along the radial direction of the winding.

8. The coil assembly as claimed in claim 7, characterized in that, The two adjacent winding coil layers are staggered.

9. The coil assembly as claimed in claim 1, characterized in that, The winding section includes a first winding coil layer and a second winding coil layer arranged adjacent to each other along the radial direction of the winding coil. The first winding coil and the second winding coil in the first winding coil layer are arranged side by side along the axial direction of the winding coil. The first winding coil and the second winding coil in the second winding coil layer are arranged side by side along the axial direction of the winding coil.

10. The coil assembly as claimed in claim 9, characterized in that, At least a portion of the first winding in the first winding coil layer is embedded in a groove formed by the first winding and the second winding in the second winding coil layer, and at least a portion of the second winding in the first winding coil layer is embedded in a groove formed by the first winding and the second winding in another set of the first winding and the second winding in the second winding coil layer.

11. The coil assembly as claimed in claim 7, characterized in that, The winding section includes a first winding coil layer and a second winding coil layer arranged adjacent to each other along the winding radially. In the first winding coil layer, the first winding and the second winding are arranged side by side along the winding axial direction. In the second winding coil layer, the first winding and the second winding are arranged side by side along the winding radially.

12. The coil assembly as claimed in claim 11, characterized in that, The first winding coil layer is located inside the second winding coil layer.

13. The coil assembly as claimed in claim 12, characterized in that, At least a portion of the first winding in the first winding layer is located in a groove formed by two adjacent first windings in the second winding layer, and at least a portion of the second winding in the first winding layer is located in a groove formed by another two adjacent first windings in the second winding layer.

14. The coil assembly as claimed in claim 11, characterized in that, The first winding coil layer is located outside the second winding coil layer.

15. The coil assembly as claimed in claim 14, characterized in that, At least a portion of the second winding in the first winding layer is located in the groove formed by the first winding and the second winding in the second winding layer.

16. The coil assembly as described in any one of claims 1 to 15, characterized in that, The first winding includes a first input terminal and a first output terminal; the second winding includes a second input terminal and a second output terminal. The first input terminal is electrically connected to the second input terminal, and the first output terminal is electrically connected to the second output terminal; the first input terminal and the first output terminal are used for electrical connection to the first controller; or... The first output terminal is electrically connected to the second input terminal, and the first input terminal and the second output terminal are used for electrical connection to the first controller; or... The first input terminal and the first output terminal are used to electrically connect to the first controller, and the second input terminal and the second output terminal are used to electrically connect to the second controller.

17. The coil assembly as claimed in claim 16, characterized in that, The first input terminal and the second output terminal are located on opposite sides of the axial direction of the coil assembly; or, the first input terminal and the second output terminal are located on the same side of the coil assembly.

18. The coil assembly as described in any one of claims 1 to 15, 17, characterized in that, The first winding includes a first metal wire core, a first insulating layer, and a first adhesive layer. The first insulating layer is disposed on the outer layer of the first metal wire core, and the first adhesive layer is disposed on the outer layer of the first insulating layer. The second winding includes a second metal wire core, a second insulating layer, and a second adhesive layer. The second insulating layer is disposed on the outer layer of the second metal wire core, and the second adhesive layer is disposed on the outer layer of the second insulating layer. The first adhesive layer and the second adhesive layer are bonded together.

19. A coil assembly, characterized in that, It includes an inlet end, a winding section, and an outlet end. The inlet end and the outlet end are located on the same side of the winding section, and the winding section has an odd number of wire layers along the radial direction.

20. The coil assembly as claimed in claim 19, characterized in that, The winding section includes a first winding coil layer and a second winding coil layer arranged adjacent to each other along the winding coil radially. The winding coil of each winding coil layer includes at least two windings arranged in parallel. At least two windings in the first winding coil layer are arranged in parallel along the winding coil axially, and at least two windings in the second winding coil layer are arranged in parallel along the winding coil radially.

21. The coil assembly as claimed in claim 20, characterized in that, The windings in the first winding coil layer are embedded in the groove formed by the connection of two windings in the second winding coil layer, and each pair of adjacent winding coils are bonded together.

22. A speaker module, characterized in that, include: Diaphragm The coil assembly as described in any one of claims 1 to 21, wherein one end of the coil assembly is connected to one side of the diaphragm along the axial direction; A magnet assembly, the magnet assembly further comprising an inner magnet and an outer magnet, the outer magnet being disposed on the outer periphery of the inner magnet, an annular gap being formed between the outer magnet and the inner magnet, and a coil assembly being disposed in the annular gap, the coil assembly being arranged around the outer periphery of the inner magnet.

23. An earphone, characterized in that, It includes the coil assembly as described in any one of claims 1 to 21, or the speaker module as described in claim 22.

24. An electronic device, characterized in that, It includes the coil assembly as described in any one of claims 1 to 21, or the speaker module as described in claim 22.

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