Coil component

Abstract

The present invention provides a coil component capable of suppressing winding misalignment. The coil component includes an iron core having a core portion and a coil wound around the core portion and comprising a plurality of wires. The coil has a stranded portion formed by twisting the plurality of wires together. The stranded portion forms an overlapping region comprising a first layer consisting of multiple turns continuously wound on the core portion and a second layer consisting of multiple turns continuous with and wound on the first layer. In the second layer, at least one group of adjacent turns exists, and at least one group of adjacent turns in all groups are separated from each other.

Description

[0001] This application is a divisional application of application No. 2021 1 1202 358.9, filed on October 15, 2021, entitled "Coil Component". Technical Field

[0002] This invention relates to coil components. Background Technology

[0003] Conventionally, as a coil component, there exists a coil component as described in Japanese Patent Application Publication No. 2017-188568 (Patent Document 1). This coil component includes an iron core having a winding core portion and a coil wound around the winding core portion and comprising multiple wires. The coil has a stranded portion formed by twisting the multiple wires together, the stranded portion comprising a first layer formed by continuously winding multiple turns on the winding core portion and a second layer formed by continuously winding multiple turns on the first layer.

[0004] Patent document: Japanese Patent Application Publication No. 2017-188568

[0005] However, in conventional coil components, all adjacent turns in the second layer are in contact with each other. Furthermore, each turn is composed of a stranded section, which easily leads to expansion between the two stranded wires. Therefore, there is a problem of "winding misalignment," where adjacent turns interfere with each other, causing the turns of the second layer to be misaligned in their intended positions on the first layer. Summary of the Invention

[0006] Therefore, the objective of this invention is to provide a coil component capable of suppressing winding misalignment.

[0007] To solve the above-mentioned problems, a coil component according to one aspect of the present invention includes:

[0008] Iron core, which has a wound core section; and

[0009] A coil, wound around the aforementioned core, comprises multiple wires.

[0010] The coil described above has a stranded section formed by twisting together the aforementioned plurality of wires.

[0011] The aforementioned stranded section forms an overlapping region comprising a first layer continuously wound multiple turns on the aforementioned core section and a second layer continuously wound multiple turns on the aforementioned first layer.

[0012] In the second layer, there must be at least one set of adjacent turns.

[0013] At least one group of adjacent turns in all groups are separated from each other.

[0014] Here, the overlapping region refers to the area where a second layer is stacked on top of the first layer, and the stranded sections are stacked. Furthermore, adjacent turns refer to the groups of turns (P-1) and P, and turns P and (P+1), in the case where the second layer consists of, for example, three turns: turn (P-1), turn P, and turn (P+1) (P: a natural number). That is, in this case, there are two groups of adjacent turns.

[0015] According to the coil component of the present invention, in the second layer, at least one group of adjacent turns are separated from each other, thus suppressing winding misalignment. Furthermore, the separation of at least one group of adjacent turns reduces stray capacitance between turns, thereby improving mode switching characteristics.

[0016] In another embodiment of the coil component,

[0017] The aforementioned core portion has a first end and a second end in the axial direction.

[0018] The stranded portion of the first layer is wound from the first end toward the second end.

[0019] The stranded portion of the second layer is wound from the second end toward the first end.

[0020] According to the above embodiment, the second layer does not ride on the return line connecting the first and second layers, thus more effectively suppressing winding misalignment. Furthermore, stray capacitance between the first turn of the second layer and the first layer can be reduced.

[0021] In another embodiment of the coil component, when the final turn of the first layer is set as the Nth turn (N: a natural number greater than or equal to 5), the first turn of the second layer is arranged above the (Nk)th turn (k: a natural number satisfying 1≤k≤N-4) and the (Nk-1)th turn.

[0022] According to the above embodiment, the first turn of the second layer is positioned away from the final turn of the first layer. Therefore, even if the first turn of the second layer is misaligned and wound towards the final turn of the first layer than desired, it is possible to suppress falling onto the core portion.

[0023] In another embodiment of the coil component, the first turn of the second layer is disposed above the Tth turn (T: a natural number of 4 or more) and the (T-1)th turn, which are the final turns of the first layer.

[0024] According to the above implementation, the number of turns of the final turn of the first layer is similar to the number of turns of the first turn of the second layer, thus further reducing stray capacitance.

[0025] In another embodiment of the coil component,

[0026] The aforementioned core portion has a first end and a second end in the axial direction.

[0027] The stranded portion of the first layer is wound from the first end toward the second end.

[0028] The stranded portion of the second layer is wound from the first end toward the second end.

[0029] According to the above implementation, there is no situation where the lead wires drawn from the final turn of the second layer climb onto the second layer, thus suppressing the winding disorder caused by the lead wires pressing against the second layer.

[0030] In another embodiment of the coil component, the final turn of the stranded wire is wound onto the core portion.

[0031] According to the above embodiment, compared with the case where the final turn of the second layer is directly wired to the electrode, the winding slack of the final turn of the stranded wire can be suppressed.

[0032] In another embodiment of the coil component, the final turn of the stranded wire portion and the turns continuous with the final turn are wound on the core portion.

[0033] According to the above embodiments, it is possible to more effectively suppress winding slack near the final turn of the stranded wire.

[0034] In another embodiment of the coil component, multiple of the aforementioned overlay regions exist along the axial direction of the aforementioned core portion.

[0035] According to the above implementation method, stray capacitance between the first layer and the second layer can be further reduced.

[0036] In another embodiment of the coil component, adjacent turns of all groups are separated from each other.

[0037] According to the above implementation method, winding misalignment can be suppressed more effectively. Furthermore, stray capacitance is reduced, thereby further improving mode switching characteristics.

[0038] According to the coil component as an embodiment of the present invention, winding misalignment can be suppressed. Attached Figure Description

[0039] Figure 1 This is a simplified perspective view of the first embodiment of the coil component, viewed from the lower surface side.

[0040] Figure 2A This is an enlarged view of the twisted section of the Z-twist wire.

[0041] Figure 2B This is an enlarged view of the twisted section of the S-twist.

[0042] Figure 3A This is a simplified bottom view of the coil component according to the first embodiment.

[0043] Figure 3B This is a simplified cross-sectional view of the coil component according to the first embodiment.

[0044] Figure 4 This is a simplified cross-sectional view of the coil component according to the second embodiment.

[0045] Figure 5 This is a simplified cross-sectional view of the coil component according to the third embodiment.

[0046] Figure 6 This is a simplified cross-sectional view of the coil component according to the fourth embodiment.

[0047] Explanation of reference numerals in the attached figures

[0048] 1, 1A, 1B, 1C…coil components; 10…iron core; 11…first flange; 12…second flange; 13…core; 15…plate components; 20…coil; 21…first wire; 22…second wire; 25…stranded wire; 31~34…first electrode~fourth electrode; B…overlapping area; B1…first overlapping area; B2…second overlapping area; D1…return wire; D2…lead wire; L1…first layer; L2…second layer. Detailed Implementation

[0049] Hereinafter, one aspect of the present invention will be described in detail with reference to the illustrated embodiments.

[0050] (First Embodiment)

[0051] Figure 1 This is a simplified perspective view of the first embodiment of the coil component, viewed from the lower surface side. Figure 1 As shown, the coil component 1 includes: an iron core 10, a coil 20 wound around the iron core 10, a first electrode portion 31, a second electrode portion 32, a third electrode portion 33, and a fourth electrode portion 34 disposed on the iron core 10 and electrically connected to the coil 20, serving as external terminals, and a plate component 15 mounted on the iron core 10. Furthermore, in Figure 1 For convenience, coil 20 is simplified in this text. Details of coil 20 will be described later. Figure 3A as well as Figure 3B The explanation is provided below.

[0052] The core 10 has: a core portion 13 extending in a predetermined direction for winding with a coil 20; a first flange portion 11 located at a first end in the direction (axial) of the core portion 13 and protruding in a direction orthogonal to that direction; and a second flange portion 12 located at a second end in the direction (axial) of the core portion 13 and protruding in a direction orthogonal to that direction. The core 10 is preferably made of a magnetic material, such as a sintered ferrite body or a molded body of resin containing magnetic powder, but it can also be made of a non-magnetic material such as alumina or resin. The cross-section of the core portion 13, which is orthogonal to the direction of the core portion 13, can be quadrilateral, other polygonal shapes, or a circular, elliptical, or other shapes obtained by appropriately combining them. Furthermore, the lower surface of the core 10 is referred to as the surface on which it is mounted to the mounting substrate, and the surface opposite to the lower surface is referred to as the upper surface of the core 10.

[0053] The first flange portion 11 has: an inner surface 111 facing the core portion 13, an outer surface 112 facing the side opposite to the inner surface 111, a lower surface 113 connecting the inner surface 111 and the outer surface 112, an upper surface 114 facing the side opposite to the lower surface 113, and two side surfaces 115 connecting the inner surface 111 and the outer surface 112 and connecting the lower surface 113 and the upper surface 114. Similarly, the second flange portion 12 has: an inner surface 121 facing the core portion 13, an outer surface 122 facing the side opposite to the inner surface 121, a lower surface 123, an upper surface 124, and two side surfaces 125. The lower surface 123, upper surface 124, and side surfaces 125 of the second flange portion 12 face the same direction as the lower surface 113, upper surface 114, and side surfaces 115 of the first flange portion 11. Furthermore, the terms "lower surface" and "upper surface" are used in the description, but in practice they may not correspond to "below" and "above" in the vertical direction.

[0054] The plate component 15 is attached to the upper surface 114 of the first flange 11 and the upper surface 124 of the second flange 12 by adhesive. For example, the plate component 15 has a length of approximately 3.2 mm, a width of approximately 2.5 mm, and a thickness of approximately 0.7 mm. The material of the plate component 15 is, for example, the same as that of the iron core 10. When both the iron core 10 and the plate component 15 are magnetic materials, they form a closed magnetic circuit, thereby improving the efficiency of inductance.

[0055] The first flange 11 has two legs on its lower surface 113 side. A first electrode 31 is disposed on one leg, and a second electrode 32 is disposed on the other leg. The second flange 12 has two legs on its lower surface 123 side. A third electrode 33 is disposed on one leg located on the same side as the leg where the first electrode 31 is disposed, and a fourth electrode 34 is disposed on the other leg located on the same side as the leg where the second electrode 32 is disposed. Figure 1As shown, lower surface 113 and lower surface 123 refer to the portions extending from the lower surface portion of the leg through the inclined portion of the thigh between the legs and including the lower surface portion of the thigh. At least one of the first electrode portion 31, the second electrode portion 32, the third electrode portion 33, and the fourth electrode portion 34 may have an end face and a bottom face. Alternatively, the end face may be formed on the outer surface 112 of the first flange portion 11 and / or the outer surface 122 of the second flange portion 12, including a NiCr layer, a NiCu layer, a Cu layer, a Ni layer, and a Sn layer. The bottom face may be formed on the lower surface 113 of the first flange portion 11 and / or the lower surface 123 of the second flange portion 12. Alternatively, the end face and the bottom face may be connected, including an Ag layer, a Cu layer, a Ni layer, and a Sn layer. Furthermore, in the following description, the first electrode portion 31, the second electrode portion 32, the third electrode portion 33, and the fourth electrode portion 34 may be described together as electrode portions 31 to 34.

[0056] The coil 20 includes a first wire 21 and a second wire 22 wound around a core portion 13. That is, the coil axis of the coil 20 is aligned with the axial direction of the core portion. The first wire 21 and the second wire 22 are, for example, wires made of metals such as copper (e.g., conductor diameter: φ0.020mm~φ0.080mm) covered with an insulating film made of resins such as polyurethane, imide-modified polyurethane, polyesterimide, and polyamideimide. One end of the first wire 21 is electrically connected to the first electrode portion 31, and the other end is electrically connected to the third electrode portion 33. One end of the second wire 22 is electrically connected to the second electrode portion 32, and the other end is electrically connected to the fourth electrode portion 34. The first wire 21 and the second wire 22 are connected to the electrode portions 31-34, for example, by heat pressing, brazing, fusion welding, etc.

[0057] The first wire 21 and the second wire 22 are wound in the same direction relative to the core portion 13. Therefore, in the coil component 1, if a differential signal or other inverse signal is input to the first wire 21 and the second wire 22, the magnetic flux generated by the first wire 21 and the second wire 22 cancels each other out, thereby reducing their inductance and allowing the signal to pass through. On the other hand, if an in-phase signal such as external noise is input to the first wire 21 and the second wire 22, the magnetic flux generated by the first wire 21 and the second wire 22 reinforces each other, thereby strengthening their inductance and blocking the noise from passing through. Therefore, the coil component 1 functions as a common-mode choke coil that reduces the transmission loss of differential-mode signals such as differential signals and attenuates common-mode signals such as external noise.

[0058] When the coil component 1 is mounted on the mounting substrate, the lower surfaces of the first flange portion 11 and the second flange portion 12 face the mounting substrate. At this time, the direction in which the core portion 13 extends from the first end to the second end is parallel to the main surface of the mounting substrate. That is, the coil component 1 is a horizontally wound type in which the coil axes of the first wire 21 and the second wire 22 are parallel to the mounting substrate.

[0059] The coil 20 has a stranded section 25 formed by twisting a first wire 21 and a second wire 22 together. Figure 2A and Figure 2B This is an enlarged view of the stranded section 25. Figure 2A This indicates the Z-twisted strand portion 25a. Figure 2B This indicates the S-twisted strand section 25b. The twisting direction of the Z-twisted strand section 25a is opposite to the twisting direction of the S-twisted strand section 25b. For example... Figure 2A and Figure 2B As shown, the stranded section 25 is formed by twisting the first wire 21 and the second wire 22 together. In the stranded section 25, the relative differences between the two wires (circuit length, stray capacitance deviation, etc.) are reduced, thus reducing mode conversion outputs within the coil component 1, such as differential-mode signals being converted to common-mode signals and output, or vice versa, thereby improving mode conversion characteristics. Furthermore, in... Figure 2A and Figure 2B In the stranded section 25, the first wire 21 and the second wire 22 are closely connected and twisted together, but there may be gaps between them, or they may be twisted together while maintaining gaps. In the coil component 1, the area where the coil 20 is wound around the core section 13 is roughly defined as the stranded section 25. Furthermore, the twisting direction of the stranded section 25 can be Z-twist, S-twist, or a mixture of Z-twist and S-twist as described later.

[0060] Figure 3A This is a simplified bottom view of the coil component 1 of the first embodiment, viewed from the lower surface side. As described above, the coil 20 is wound around the core portion 13, with one end of the first wire 21 electrically connected to the first electrode portion 31 and the other end electrically connected to the third electrode portion 33. Additionally, one end of the second wire 22 is electrically connected to the second electrode portion 32 and the other end is electrically connected to the fourth electrode portion 34. In the area where the coil 20 is wound around the core portion 13, a stranded portion 25 is formed by twisting the first wire 21 and the second wire 22 together. Furthermore, in... Figure 3A For simplicity, the twisted wire section 25 is represented by a single wire. Additionally, in... Figure 3A For convenience, the twisted section 25, which will be referred to as the second layer, is marked with a slash.

[0061] Figure 3B This is a simplified cross-sectional view of the coil component 1 according to the first embodiment. Figure 3BThis is a partial view showing the coil 20 along the axial direction of the core 13 from the first end 131 to the second end 132, and a cross-section of the core 13. Figure 3B In the diagram, for simplicity, the twisted section 25 is represented by a single line, and its cross-section is represented by a single circle. Additionally, in... Figure 3B In this design, the number of turns is represented by numbers, starting from the first end 131 of the core portion 13 of the coil 20. The turn number is not a sequential numbering starting from the turn closest to the first flange portion 11, but rather a numbering of the winding sequence of the coil. In the coil component 1, the stranded wire portion 25 winds a total of 24 turns from the first end 131 of the core portion 13 toward the second end 132, from the first turn to the 24th turn.

[0062] like Figure 3B As shown, the stranded portion 25 of the coil 20 has a first layer consisting of multiple turns continuously wound on the core portion 13. Figure 3B In the diagram, denoted by reference numeral L1 (hereinafter the same), and the second layer, which is continuous with the first layer and wound multiple turns on top of the first layer (in... Figure 3B In the figure, the overlapping region B is indicated by the reference numeral L2 (the same applies below).

[0063] In the overlay region B, the first layer is directly wound onto the core portion 13, and the second layer is directly wound onto the first layer. Specifically, in the overlay region B, the first layer consists of 18 turns, from the first turn to the 18th turn, which are continuously wound onto the core portion 13. The second layer is continuous with the 18th turn of the first layer and consists of the 19th turn disposed above the 16th and 17th turns of the first layer, the 20th turn disposed above the 13th and 14th turns of the first layer, the 21st turn disposed above the 8th and 9th turns of the first layer, the 22nd turn disposed above the 5th and 6th turns of the first layer, and the 23rd turn disposed above the 2nd and 3rd turns of the first layer.

[0064] Here, in coil component 1, in the second layer of the overlay region B, at least one set of adjacent turns exists. Figure 3B In the case of coil component 1 shown, adjacent turns exist in a total of four groups: a first group of turns 19 and 20, a second group of turns 20 and 21, a third group of turns 21 and 22, and a fourth group of turns 22 and 23. Furthermore, at least one group of adjacent turns in all groups is separated from each other. "Separated" means that the individual wires of the adjacent turns do not contact each other throughout the entire turn. Figure 3BIn the case of coil component 1 shown, all adjacent turns in groups 1 through 4 are separated from each other. That is, adjacent turns in group 1 (turn 19 and turn 20) are separated from each other by a 2-turn interval, adjacent turns in group 2 (turn 20 and turn 21) are separated from each other by a 4-turn interval, adjacent turns in group 3 (turn 21 and turn 22) are separated from each other by a 2-turn interval, and adjacent turns in group 4 (turn 22 and turn 23) are separated from each other by a 2-turn interval.

[0065] According to the coil component 1 described above, in the second layer, at least one group of adjacent turns are separated from each other. Therefore, adjacent turns do not interfere with each other, thus suppressing winding misalignment. Furthermore, since at least one group of adjacent turns are separated, the stray capacitance between the separated adjacent turns is reduced, thereby improving mode switching characteristics. In particular, as... Figure 3B As shown in coil component 1, in the second layer, all adjacent turns in each group are separated from each other, thereby more effectively suppressing winding misalignment. Furthermore, stray capacitance is further reduced, thereby further improving mode switching characteristics. Additionally, as... Figure 3B As shown, adjacent turns effectively suppress winding misalignment, therefore it is preferable that they have a spacing of more than one turn between them.

[0066] Additionally, in coil component 1, such as Figure 3B As shown, the stranded portion 25 of the first layer is wound from the first end 131 toward the second end 132, and the stranded portion of the second layer is wound from the second end 132 toward the first end 131. Therefore, compared to the case where the stranded portion of the second layer is wound from the first end 131 toward the second end 132, the second layer does not ride on the return line D1 connecting the first and second layers, thus more effectively suppressing winding misalignment. Furthermore, since the second layer does not ride on the return line D1, the risk of short circuits between wires due to damage to the return line D1 is reduced. The return line D1 is the stranded portion that connects the final turn (18th turn) of the first layer to the initial turn (19th turn) of the second layer, and returns the initial turn from the final turn to the winding start side (in this embodiment, the first end 131 side). Furthermore, compared to the case where the stranded portion 25 of the second layer is wound from the first end 131 toward the second end 132, since the turn number of the first turn (19th turn) of the second layer is similar to the turn number of the turns (16th and 17th turns) of the first layer that the first turn contacts, the stray capacitance between the first turn of the second layer and the first layer can be reduced.

[0067] Furthermore, in coil component 1, when the final turn of the first layer is set to the Nth turn (N: a natural number greater than 5), the first turn of the second layer is positioned above the (Nk)th turn (k: a natural number satisfying 1 ≤ k ≤ N-4) and the (Nk-1)th turn. Figure 3BIn the case of coil component 1 shown, the final turn of the first layer is the 18th turn, therefore N=18. Furthermore, in Figure 3B In the case of coil component 1 shown, k=1 is used as a natural number satisfying 1≤k≤N-4 (=14). That is, the first turn of the second layer, which is also the 19th turn, is positioned above the 17th turn, which is the (Nk)th turn, and the 16th turn, which is the (Nk-1)th turn. Thus, the first turn of the second layer is positioned away from the last turn of the first layer, so even if the first turn of the second layer is misaligned and wound towards the last turn of the first layer than desired, it can be prevented from falling onto the core portion 13.

[0068] Furthermore, the first turn of the second layer can also be positioned above the Tth turn (T: a natural number greater than 4) and the (T-1)th turn, which is the final turn of the first layer. (Refer to...) Figure 3B To explain further, the first turn (19th turn) of the second layer can also be positioned above the 18th and 17th turns, which are the final turns of the first layer. As a result, since the turn number of the final turn of the first layer is similar to the turn number of the first turn of the second layer, stray capacitance can be further reduced.

[0069] Furthermore, in coil component 1, the final turn of the second layer is positioned above the Mth turn (M: a natural number satisfying 2≤M≤N-2) and the (M+1)th turn of the first layer. Figure 3B In the case of coil component 1 shown, M=2 is used as a natural number satisfying 2≤M≤N-2 (=16). That is, the 23rd turn, which is the final turn of the second layer, is positioned above the 2nd turn, which is the Mth turn, and the 3rd turn, which is the (M+1)th turn. Thus, the final turn of the second layer is positioned away from the 1st turn of the first layer, so even if the final turn of the second layer is misaligned and wound closer to the 1st turn of the first layer than desired, it is possible to prevent it from falling onto the core 13. However, the final turn of the second layer can also be positioned above the 1st and 2nd turns of the first layer.

[0070] Furthermore, in coil component 1, the final turn of stranded wire 25 is wound onto core portion 13. Figure 3B In the case of the coil component 1 shown, the 24th turn, which is the final turn of the stranded section 25, is wound onto the core section 13. Therefore, compared to the case where the lead wire D2, which is drawn from the final turn (23rd turn) of the second layer, is directly routed to the third electrode section 33 and the fourth electrode section 34, the loosening of the final turn of the stranded section 25 can be suppressed. The lead wire D2 is a stranded section that connects the final turn of the second layer to the turn wound on the core section 13, and leads the turn wound on the core section 13 from the final turn towards the winding end side (in this embodiment, the second end 132 side).

[0071] Specifically, if lead wire D2 is directly routed from the final turn (23rd turn) of the second layer to the third electrode section 33 and the fourth electrode section 34 (i.e., if the 24th turn does not exist), slack in the winding of the 23rd turn, which becomes the final turn of the stranded section 25, may occur. On the other hand, as... Figure 3B As shown in the coil component 1, the 24th turn, which becomes the final turn of the stranded section 25, is wound on the core section 13, thereby suppressing the slack of the 24th turn and also suppressing the slack of the 23rd turn.

[0072] In addition, such as Figure 3B As shown, the final turn (24th turn) of the stranded section 25 is preferably positioned away from the overlay region B. Therefore, the final turn of the stranded section 25 does not interfere with the overlay region B, further suppressing winding misalignment.

[0073] Preferably, the final turn of the stranded section 25 and the turns continuous with the final turn can also be wound onto the core section 13. (Refer to...) Figure 3B To illustrate, for example, the 24th turn, which is the final turn of the stranded section 25, and the 23rd and 22nd turns, which are consecutive to the 24th turn, can also be wound onto the core section 13. This allows for more effective suppression of winding slack near the final turn of the stranded section 25.

[0074] (Second Implementation)

[0075] Figure 4 This is a simplified cross-sectional view showing the second embodiment of the coil component. The direction of travel of the turns in the second layer of the second embodiment differs from that of the first embodiment. This difference in structure will be described below. Other structures are the same as those in the first embodiment, and therefore the same reference numerals are used, and their descriptions are omitted.

[0076] like Figure 4As shown, in the coil component 1A of the second embodiment, in the winding region B, the first layer consists of 18 turns, from the first turn to the 18th turn, continuously wound on the core portion 13. The second layer is continuous with the 18th turn of the first layer and consists of a 19th turn disposed above the 2nd and 3rd turns of the first layer, a 20th turn disposed above the 5th and 6th turns of the first layer, a 21st turn disposed above the 8th and 9th turns of the first layer, a 22nd turn disposed above the 13th and 14th turns of the first layer, and a 23rd turn disposed above the 16th and 17th turns of the first layer. According to the above structure, in the coil component 1A of the second embodiment, the stranded portion 25 of the first layer is wound from the first end 131 toward the second end 132, and the stranded portion of the second layer is also wound from the first end 131 toward the second end 132. Therefore, there is no situation where the lead wire D2, which is drawn from the final turn (turn 23) of the second layer, climbs onto the second layer, thus suppressing the winding disorder caused by the lead wire D2 pressing against the second layer.

[0077] (Third implementation)

[0078] Figure 5 This is a simplified cross-sectional view showing the third embodiment of the coil component. The third embodiment differs from the first embodiment in that it has multiple overlapping winding regions. Hereinafter, this different structure will be described. The other structures are the same as those in the first embodiment, and therefore the same reference numerals are used as in the first embodiment, and their descriptions are omitted.

[0079] like Figure 5 As shown, in the coil component 1B of the third embodiment, multiple overlapping regions exist along the axial direction of the core portion 13. Specifically, the stranded portion 25 of the coil 20 has two overlapping regions B1 and B2. The first overlapping region B1 and the second overlapping region B2 are arranged sequentially from the first end 131 of the core portion 13 toward the second end 132, and adjacent overlapping regions are separated from each other. However, the first overlapping region B1 and the second overlapping region B2 may also be in close contact without any gap between them.

[0080] The first layer of the first winding region B1 and the second winding region B2 are directly wound onto the core portion 13, and the second layer is directly wound onto the first layer. Specifically, in the first winding region B1, the first layer consists of nine turns, from the first turn to the ninth turn, which are continuously wound onto the core portion 13. The second layer is continuous with the ninth turn of the first layer and consists of a tenth turn disposed above the seventh and eighth turns of the first layer, an eleventh turn disposed above the fourth and fifth turns of the first layer, and a twelfth turn disposed above the first and second turns of the first layer. In the second winding region B2, the first layer consists of nine turns, from the 13th to the 21st, continuously wound on the core portion 13. The second layer is continuous with the 21st turn of the first layer and consists of a 22nd turn disposed above the 19th and 20th turns of the first layer and a 23rd turn disposed above the 15th and 16th turns of the first layer. The final turn (12th turn) of the first winding region and the initial turn (13th turn) of the second winding region B2 are connected by a lead wire D2. According to the above structure, in the coil component 1B of the third embodiment, the stranded portion 25 of the first layer is wound from the first end 131 toward the second end 132, and the stranded portion of the second layer is wound from the second end 132 toward the first end 131. The coil component 1B has multiple overlapping regions. Therefore, compared with the case where there is only one overlapping region, the number of turns of each turn in the first layer is similar to the number of turns of each turn in the second layer, thereby further reducing the stray capacitance between the first layer and the second layer.

[0081] (Fourth implementation)

[0082] Figure 6 This is a simplified cross-sectional view showing the fourth embodiment of the coil component. The fourth embodiment differs from the first embodiment in that the direction of the turns in the second layer and the presence of multiple overlapping regions. This difference in structure will be described below. Other structures are the same as those in the first embodiment, and therefore the same reference numerals are used, and their descriptions are omitted.

[0083] like Figure 6 As shown, in the coil component 1C of the fourth embodiment, multiple overlapping regions exist along the axial direction of the core portion 13. Specifically, the stranded portion 25 of the coil 20 has two overlapping regions B1 and B2. The first overlapping region B1 and the second overlapping region B2 are arranged sequentially from the first end 131 of the core portion 13 toward the second end 132, and adjacent overlapping regions are separated from each other. However, the first overlapping region B1 and the second overlapping region B2 may also be in close contact without any gap between them.

[0084] The first layer of both the first winding region B1 and the second winding region B2 is directly wound onto the core portion 13, and the second layer is directly wound onto the first layer. Specifically, in the first winding region B1, the first layer consists of nine turns, from the first to the ninth, continuously wound onto the core portion 13. The second layer is continuous with the ninth turn of the first layer and consists of a tenth turn positioned above the first and second turns of the first layer, an eleventh turn positioned above the fourth and fifth turns of the first layer, and a twelfth turn positioned above the seventh and eighth turns of the first layer. In the second winding region B2, the first layer consists of nine turns, from the thirteenth to the twenty-first, continuously wound onto the core portion 13. The second layer is continuous with the twenty-first turn of the first layer and consists of a twenty-second turn positioned above the fifteenth and sixteenth turns of the first layer and a twenty-third turn positioned above the nineteenth and twentyth turns of the first layer. The final turn (12th turn) of the first folded region and the initial turn (13th turn) of the second folded region B2 are connected by lead wire D2. According to the above structure, in the coil component 1C of the fourth embodiment, the stranded portion 25 of the first layer is wound from the first end 131 toward the second end 132, and the stranded portion of the second layer is also wound from the first end 131 toward the second end 132. Therefore, the lead wire D2 leading from the final turn (12th and 23rd turns) of the second layer will not climb onto the second layer, thus suppressing winding disorder caused by the lead wire D2 pressing against the second layer. Furthermore, having multiple folded regions, compared to the case with only one folded region, the turn number of each turn in the first layer is similar to the turn number of each turn in the second layer, thereby further reducing stray capacitance between the first and second layers.

[0085] Furthermore, the present invention is not limited to the embodiments described above, and design changes can be made without departing from the spirit of the invention. For example, the feature points of each of the first to fourth embodiments can be combined in various ways.

[0086] In the above embodiment, the coil comprises two wires, but the coil may comprise multiple wires, or even more than three wires. In this case, the stranded section is not limited to a structure formed by stranding two wires together, but may also be a structure formed by stranding three or more wires together.

[0087] The number of turns in each of the first and second layers can be increased or decreased freely. However, the number of turns must be multiple in each of the first and second layers. Therefore, in the second layer, there must be at least one set of adjacent turns.

[0088] In the above embodiment, in the second layer, all adjacent turns of all groups are separated from each other, but it is also possible that at least one group of adjacent turns are separated from each other.

[0089] In the above embodiment, the final turn of the stranded wire is wound on the core portion, but it can also be a structure in which the final turn of the stranded wire is not wound on the core portion, that is, the wire drawn from the final turn of the second layer is directly wired to the third electrode portion 33 and the fourth electrode portion 34.

[0090] In the third and fourth embodiments described above, there are two overlapping regions, but the number of overlapping regions is not particularly limited, and there may be three or more overlapping regions. Furthermore, in each overlapping region, the direction of travel of the turns in the second layer may be different. For example, in the third embodiment described above, in both the first overlapping region B1 and the second overlapping region B2, the stranded portion of the second layer is wound from the second end 132 toward the first end 131. However, it is also possible that in the first overlapping region B1, the stranded portion of the second layer is wound from the first end 131 toward the second end 132, and in the second overlapping region B2, the stranded portion of the second layer is wound from the second end 132 toward the first end 131. Alternatively, in the first winding region B1, the stranded portion of the second layer is wound from the second end 132 toward the first end 131, and in the second winding region B2, the stranded portion of the second layer is wound from the first end 131 toward the second end 132.

Claims

1. A coil component, characterized in that, have: Iron core, the iron core having a wound core portion; and A coil, the coil being wound around the core portion, comprising multiple wires, The coil has a stranded section formed by twisting the plurality of wires together. The stranded section forms an overlapping region comprising a first layer consisting of multiple turns continuously wound on the core section and a second layer consisting of multiple turns continuous with and wound on the first layer. In the second layer, there must be at least one set of adjacent turns. The core portion has a first end and a second end in the axial direction. The stranded portion of the first layer is wound from the first end toward the second end. The stranded portion of the second layer is wound from the first end toward the second end.

2. The coil component according to claim 1, characterized in that, The core portion has a first end and a second end in the axial direction. The stranded portion of the first layer is wound from the first end toward the second end. The stranded portion of the second layer is wound from the second end toward the first end.

3. The coil component according to claim 2, characterized in that, When the final turn of the first layer is set as the Nth turn, the first turn of the second layer is positioned above the (Nk)th turn and the (Nk-1)th turn. in, N is a natural number greater than or equal to 5. k is a natural number that satisfies 1≤k≤N-4.

4. The coil component according to claim 2, characterized in that, The first turn of the second layer is positioned above the T-th turn and the (T-1)-th turn, which are the final turns of the first layer. in, T is a natural number greater than or equal to 4.

5. The coil component according to any one of claims 1 to 4, characterized in that, The final turn of the stranded wire is wound onto the core portion.

6. The coil component according to any one of claims 1 to 5, characterized in that, The final turn of the stranded section and the turns that follow the final turn are wound onto the core section.

7. The coil component according to any one of claims 1 to 6, characterized in that, The overlapping regions exist in multiples along the axial direction of the core portion.

8. The coil component according to any one of claims 1 to 7, characterized in that, In the second layer, all adjacent turns of all groups are separated from each other.

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