Coil component

Abstract

To provide a coil component that reduces the occurrence of positional displacement of a wire wound to form a plurality of layers around a winding core, while reducing the influence of a stray capacitance generated between a first wire and a second wire.SOLUTION: When the turns of a wire 4 located on a second layer closer to a second end 8 than the same number of turns of a wire 3 located on a first layer is defined as displacement in a positive direction, and the opposite case as displacement in a negative direction, there are a positive direction displacement area where the turns are displaced in the positive direction between the wire 3 and wire 4 and a negative direction displacement area where the turns are displaced in the negative direction. The turns of the wire 4 include non-contact turns T1, T18, T24 where both wires are not in contact on a side of a first end 7. Spaces S1, S2, S3 between adjacent two turns of the wire 3 located on the first layer and forming recesses to which the non-contact turns are fitted have a length L defined by 1 / 5×D≤L≤(√3-1)×D when measured in an axial direction 6.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a coil component, and more particularly to an improvement in the winding mode of a wire in a wound coil component having a structure in which two wires are wound in a state where a plurality of layers are formed around a bobbin core portion.

Background Art

[0002] In this case, for each of the first wire and the second wire wound around the bobbin core portion, the nth turn is expressed as "turn Tn" (n is a natural number).

[0003] Regarding the amount of deviation between the first wire and the second wire, for example, when the turn Tn of one wire fits into the recess between the turn Tn and the turn Tn+1 of the other wire, the amount of deviation is set to "0.5 turn". When the turn Tn+2 of the other wire fits into the recess between the turn Tn and the turn Tn+1 of one wire, the amount of deviation is set to "1.5 turns". When the turn Tn+3 of the other wire fits into the recess between the turn Tn and the turn Tn+1 of one wire, the amount of deviation is set to "2.5 turns".

[0004] Regarding the deviation direction between the first wire and the second wire, when the turn of the second wire is on the end side in the winding direction from the turn of the first wire of the same number, it is regarded as a positive deviation, and a "+" is added before the number representing the amount of deviation. In the reverse case, it is regarded as a negative deviation, and a "-" is added before the number representing the amount of deviation.

[0005] When counting the turns of the wire, it does not matter whether it is counted from the first end side of the bobbin core portion or conversely from the second end side. Even if the direction of counting the number of turns is reversed, it can be said that the configuration is essentially the same.

[0006] In this case, among the multiple layers formed by the wire wound around the core part, the layer closest to the circumferential surface of the core part, that is, the layer that at least partially contacts the circumferential surface of the core part, is defined as the first layer. The layer wound around the outer peripheral side of the first layer while fitting into the recess formed between adjacent turns of the wire located in the first layer is defined as the second layer. The layer wound around the outer peripheral side of the second layer while fitting into the recess formed between adjacent turns of the wire located in the second layer is defined as the third layer. The reason for defining that the first layer, which is the layer closest to the circumferential surface of the core part, at least partially contacts the circumferential surface of the core part is that it is normal for the wire not to contact the circumferential surface of the core part over the entire length, but for example, the wire only contacts the ridge line part of the core part with a square cross-section, and the other parts are slightly floating from the circumferential surface of the core part. Also, the second layer and the third layer are names given based on their relative positional relationships with the first layer and the second layer respectively. It is only necessary that the second layer is located on the outer peripheral side of the first layer, and the third layer is located on the outer peripheral side of the second layer.

[0007] As a representative example of the coil component to which this invention is directed, there is a common mode choke coil.

[0008] A common mode choke coil of interest to this invention is described, for example, in Japanese Patent No. 6327397 (Patent Document 1). FIG. 8(A) is a cross-sectional view schematically showing the characteristic configuration of the winding states of the two wires 51 and 52 provided in the coil component 50 that becomes the common mode choke coil described in Patent Document 1. FIG. 8(A) corresponds to FIG. 2, FIG. 7, or FIG. 8 in Patent Document 1. FIGS. 8(B) and 8(C) are for explaining the problems to be described later.

[0009] In FIGS. 8(A), 8(B), and 8(C), the cross-section showing the first wire 51 is shaded so that the distinction between the first wire 51 and the second wire 52 is clear. The first wire 51 and the second wire 52 are spirally wound around the core part 53 with substantially the same number of turns relative to each other from the first end 54 of the core part 53 toward the opposite second end 55. The first wire 51 is wound in a state of forming a first layer in contact with the circumferential surface of the core part 53, and the second wire 52 is wound in a state of forming a second layer outside the first layer while most of it is fitted into the recess formed between adjacent turns of the first wire 51.

[0010] As described above, most of the second wire 52 is wound in a state of forming the second layer outside the first layer because some turns of the second wire 52, for example, turn Tm and turn Tm+1, are wound in contact with the circumferential surface of the core part 53.

[0011] Also, in FIGS. 8(A), 8(B), and 8(C), each of the plurality of turns of the first wire 51 and each of the plurality of turns of the second wire 52 are connected by line segments. In this way, the turns connected by line segments indicate that they are the same-numbered turns counted from the first end 54.

[0012] The coil component 50 described in Patent Document 1 was developed for the purpose of reducing the mode conversion characteristics in a common mode choke coil, and the embodiment shown in FIG. 8(A) has the following characteristics.

[0013] That is, when expressed by the number of turns n counted from the first end 54 side of each of the first wire 51 and the second wire 52, the coil component 50 (1) A +0.5 turn shift region 57 where the turn Tn of the second wire 52 fits into the recess between the turn Tn and the turn Tn+1 of the first wire 51, causing a positive 0.5 turn shift between the first wire and the second wire, (2) By fitting the turn Tn+2 of the second wire 52 into the recess between the turn Tn and the turn Tn+1 of the first wire 51, a -1.5 turn shift region 58 where the first wire 51 and the second wire 52 are shifted 1.5 turns in the negative direction from each other, and (3) a transition region 59 that transitions from the +0.5 turn shift region 57 to the -1.5 turn shift region 58, are provided.

[0014] And the sum of the number of turns of the second wire 52 located in the 0.5 turn shift region 57 is 2 times or more and 5 times or less the sum of the number of turns of the second wire 52 located in the 1.5 turn shift region 58.

[0015] With such a configuration, the capacitance generated between the first wire 51 and the second wire 52 can be balanced across the entire first wire 51 and second wire 52, and the influence of the stray capacitance generated between the first wire 51 and the second wire 52 can be reduced. Therefore, for example, in a common mode choke coil, the mode conversion characteristics can be reduced.

Prior Art Documents

Patent Documents

[0016]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0017] Focusing on the second wire 52 in the wound state shown in Fig. 8(A), for the turn T1 at the start of the +0.5 turn shift region 57, no wire is in contact with the first end portion 54 side thereof, and for the turn Tm+2 near the end of the transition region 59, no wire is in contact with the first end portion 54 side thereof either.

[0018] Therefore, for example, turn T1 is likely to shift in the direction of the first end portion 54. As shown in FIG. 8(B), turn T1 may inadvertently fall onto the circumferential surface of the core portion 53, that is, turn T1 that should be positioned in the second layer may be positioned in the first layer or may be displaced toward the first layer side. Such inadvertent falling may occur even in the finished product of the coil component 50, but if it occurs in the process of winding the second wire 52 from the first end portion 54 toward the second end portion 55, subsequent turns T2, T3, … will sequentially shift. As a result, the shift region 57 will no longer be a +0.5 turn shift region, and for example, a -0.5 turn shift region 60 will be formed.

[0019] Also, turn Tm+2 is also likely to shift in the direction of the first end portion 54. As shown in FIG. 8(C), turn Tm+2 may climb over turn Tm+1 and fall between turn Tm and turn Tm+1. Although not shown in FIG. 8(C), when the interval between turn Tm and turn Tm+1 is wider, turn Tm+2 may inadvertently fall onto the circumferential surface of the core portion 53. If the shift of turn Tm+2 as described above occurs in the process of winding the second wire 52 from the first end portion 54 toward the second end portion 55, subsequent turns Tm+3, Tm+4, … will sequentially shift. As a result, the shift region 58 will no longer be a -1.5 turn shift region, and a -2.5 turn shift region 61 will be formed.

[0020] When wire displacement as shown in FIGS. 8(B) and 8(C) occurs, the capacitance generated between the first wire 51 and the second wire 52 deviates from the design value. Therefore, the capacitance balance is disrupted, and the mode conversion characteristics may deteriorate.

[0021] The problem of the same type of displacement is not limited to the common mode choke coil. For example, it may also be encountered in a wound chip transformer having the first wire and the second wire as well.

[0022] Therefore, an object of the present invention is to provide a coil component that is less likely to cause displacement of a wire wound in a state where a plurality of layers are formed around a bobbin core while reducing the influence of parasitic capacitance generated between the first wire and the second wire.

Means for Solving the Problems

[0023] The present invention is directed to a coil component including a core including a bobbin core having first and second ends opposite to each other in the axial direction, and a first wire and a second wire each having a circular cross-section with a diameter D and wound spirally from the first end to the second end around the bobbin core with substantially the same number of turns.

[0024] One of the first wire and the second wire includes a portion wound in a state of constituting a first layer that is the layer closest to the circumferential surface of the bobbin core, and the other of the first wire and the second wire includes a portion wound on the outer peripheral side of the first layer while fitting into a recess formed between adjacent turns of the wire located in the first layer and constituting a second layer.

[0025] Regarding the positional relationship between the turns of the wire located in the first layer and the turns of the wire located in the second layer, when the turns of the wire located in the second layer are on the second end side of the turns of the wire located in the first layer of the same number counted from the first end side, it is defined as a positive displacement, and when it is the opposite, it is defined as a negative displacement, there are a positive displacement region where the turns are displaced in the positive direction and a negative displacement region where the turns are displaced in the negative direction between the first wire and the second wire.

[0026] The turns of the wire located in the second layer include non-contact turns where at least on the first end side, none of the wires located in the second layer are in contact, and for at least one of the non-contact turns, the gap between two adjacent turns of the wire located in the first layer that forms the recess into which the non-contact turn fits is measured in the axial direction and has a size L defined by 1 / 5×D≦L≦(√3-1)×D having the size L.

[0027] In addition, the size L of the gap measured in the axial direction is the minimum dimension in the axial dimension given by the gap.

Advantages of the Invention

[0028] According to this invention, among the turns of the wires located in the second layer, at least on the first end side, a gap between two adjacent turns of the wires located in the first layer that forms a recess into which a non-contact turn where none of the wires are in contact fits has a size L defined by 1 / 5×D≦L≦(√3 - 1)×D when measured in the axial direction. Therefore, it is possible to make it difficult for the non-contact turns of the wires located in the second layer to be displaced.

[0029] Also, regarding the positional relationship between the turns of the wires located in the first layer and the turns of the wires located in the second layer, there are a positive displacement region where the turns are displaced in the positive direction and a negative displacement region where the turns are displaced in the negative direction between the first wire and the second wire. Therefore, the influence of the stray capacitance generated between the first wire and the second wire can be reduced. Thus, for example, in a common mode choke coil, the mode conversion characteristics can be reduced.

Brief Description of the Drawings

[0030]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

[0031] [First Embodiment] FIG. 1 shows a surface of a coil component 1 according to a first embodiment of the present invention that faces a mounting substrate (not shown). The coil component 1 is a common mode choke coil.

[0032] The coil component 1 includes a drum-shaped core 2, and a first wire 3 and a second wire 4 that each constitute an inductor. The core 2 is made of a non-conductive material, more specifically, a ferrite such as Ni-Zn-based, or a resin containing ferrite powder or metal magnetic powder.

[0033] The core 2 includes a bobbin portion 5, and a first flange portion 9 and a second flange portion 10 that respectively project from opposite first end portion 7 and second end portion 8 of the bobbin portion 5 in the axial direction 6. The cross-section of the bobbin portion 5 perpendicular to the axial direction 6 is square. Note that the ridge line portions of the bobbin portion 5 with a square cross-section may be chamfered, or the cross-sectional shape of the bobbin portion 5 may be other polygonal shapes such as hexagonal, circular, or elliptical, or a shape obtained by appropriately combining these shapes.

[0034] The first flange portion 9 and the second flange portion 10 are square prism-shaped. The first flange portion 9 has a bottom surface 11 facing the mounting substrate side, a top surface facing in the direction opposite to the bottom surface 11, an inner end surface 15 positioning the first end portion 7 of the bobbin portion 5, an outer end surface 17 on the opposite side of the inner end surface 15 and facing outward, and first side surfaces 19 and second side surfaces 20 connecting between the bottom surface 11 and the top surface and between the inner end surface 15 and the outer end surface 17. Similarly, the second flange portion 10 has a bottom surface 12 facing the mounting substrate side, a top surface facing in the direction opposite to the bottom surface 12, an inner end surface 16 positioning the second end portion 8 of the bobbin portion 5, an outer end surface 18 on the opposite side of the inner end surface 16 and facing outward, and first side surfaces 21 and second side surfaces 22 connecting between the bottom surface 12 and the top surface and between the inner end surface 16 and the outer end surface 18. The ridge line portions of the first flange portion 9 and the second flange portion 10 may be chamfered.

[0035] The coil component includes four or more terminal electrodes. In this embodiment, the coil component 1 includes four terminal electrodes 23 to 26. The first terminal electrode 23 and the third terminal electrode 25 are provided on the bottom surface 11 of the first flange portion 9, and the second terminal electrode 24 and the fourth terminal electrode 26 are provided on the bottom surface 12 of the second flange portion 10. Although not shown, the first terminal electrode 23 and the third terminal electrode 25 may extend to a part of the outer end surface 17 of the first flange portion 9, and the second terminal electrode 24 and the fourth terminal electrode 26 may extend to a part of the outer end surface 18 of the second flange portion 10.

[0036] The terminal electrodes 23 to 26 are formed, for example, by baking a conductive paste containing silver as a conductive component on the lower surfaces 11 and 12, vapor-depositing silver on the portions extending to the outer end faces 17 and 18, and then plating these base conductor films in the order of copper, nickel, and tin. Note that the terminal electrodes 23 to 26 may be provided by attaching a metal terminal made of a conductive metal plate to the core 2 using, for example, an epoxy-based adhesive.

[0037] The first wire 3 and the second wire 4 are wound spirally around the winding core portion 5. In FIG. 1, the first wire 3 is shown in a darker region so as to clearly distinguish the first wire 3 from the second wire 4. Details of the winding states of the first wire 3 and the second wire 4 will be described later. The first wire 3 and the second wire 4 include a linear center conductor made of a highly conductive metal such as copper, silver, or gold, and the center conductor is covered with an electrically insulating coating made of a resin such as polyurethane or polyamideimide. The diameter of the linear center conductor is not particularly limited. Also, the number of turns of the first wire 3 and the second wire 4 is not particularly limited. Preferably, the diameters of the first wire 3 and the second wire 4 are 20 to 100 μm.

[0038] Each end of the first wire 3 is connected to the first terminal electrode 23 and the second terminal electrode 24, and each end of the second wire 4 is connected to the third terminal electrode 25 and the fourth terminal electrode 26. For these connections, for example, thermocompression bonding is applied.

[0039] Although not shown, the coil component 1 may further include a top plate that spans between the top surfaces of the first flange portion 9 and the second flange portion 10. The top plate is for forming a closed magnetic circuit in cooperation with the core 2, and is composed of ferrite of the same type as the material of the core 2, a non-conductive magnetic material other than ferrite, or a resin containing ferrite powder or metal magnetic powder. The top plate is joined to the top surface of the first flange portion 9 and the top surface of the second flange portion 10 via an adhesive. As the adhesive, preferably, a thermosetting epoxy resin or a composite magnetic resin obtained by adding metal magnetic powder or ferrite powder with a particle size of 0.1 to 10 μm to a thermosetting epoxy resin is used. Inorganic fillers such as silica filler or inorganic magnetic powder may be added to the adhesive to improve thermal shock resistance. As the method of applying the adhesive, there are a method of dipping the top surface sides of the flange portions 9 and 10 of the core 2 into the adhesive, a method of dispensing or printing the adhesive on the surface of the top plate on the side of the core 2, and the like.

[0040] Note that instead of the top plate, a resin coating may be applied. Also, both the top plate and the coating may be absent.

[0041] The coil component 1 is manufactured, for example, as follows.

[0042] To manufacture the core 2, for example, ferrite powder is press-molded in a mold, the obtained molded body is fired, and burrs are removed by barrel polishing after firing.

[0043] Next, to provide the obtained core 2 with terminal electrodes 23 to 26, a base conductor film is formed, and then barrel plating is performed.

[0044] Next, wires 3 and 4 are discharged from the nozzles and wound around the bobbin portion 5 of the core 2. Wires 3 and 4 are usually wound separately. That is, the first wire 3 is first wound, and its end is thermocompression bonded to the first terminal electrode 23 and the second terminal electrode 24 by a heater chip. Next, the second wire 4 is wound, and its end is thermocompression bonded to the third terminal electrode 25 and the fourth terminal electrode 26 by a heater chip. The excess of wires 3 and 4 connected to the terminal electrodes 23 to 26 is cut and removed by a cutting blade. Note that the first wire 3 and the second wire 4 may be wound simultaneously.

[0045] Thereafter, if necessary, the top plate is adhered to the core 2 with an adhesive. In this way, the coil component 1 is completed. The dimensions of the coil component 1 are not particularly limited. For example, the dimension in the axial direction 6 is 3.2 mm, the dimension in the width direction (the vertical direction in FIG. 1) is 2.5 mm, and the dimension in the height direction (the direction orthogonal to the plane of FIG. 1) is 2.5 mm.

[0046] With reference mainly to FIG. 2, the winding states of the first wire 3 and the second wire 4 in the coil component 1 shown in FIG. 1 will be described. FIG. 2 shows a cross-sectional view of a part of the bobbin portion 5 around which the first wire 3 and the second wire 4 are wound. In FIG. 2, the cross-section showing the first wire 3 is shaded to clearly distinguish the first wire 3 from the second wire 4. The first wire 3 and the second wire 4 are wound spirally around the bobbin portion 5 with substantially the same number of turns.

[0047] In FIG. 2, each of the plurality of turns of the first wire 3 and each of the plurality of turns of the second wire 4 are connected by line segments. In this way, the turns connected by line segments indicate that they are the same numbered turns counted from the first end 7. Numbers are entered below each turn of the first wire 3 located in the first layer. These numbers indicate which turn each turn of the wires 3 and 4 is. Therefore, each turn of one of the wires 3 and 4 and each turn of the other of the wires 3 and 4 connected to this by a line segment are the turns of the number indicated by the above numbers and are the same numbered turns as each other. In the winding state shown in FIG. 2, both the first wire 3 and the second wire 4 have turns T1 to T30. In FIG. 1, the turns of the wires 3 and 4 are schematically illustrated. Therefore, the number of turns of the wires 3 and 4 does not match between FIGS. 1 and 2.

[0048] The description of the drawing method for FIG. 2 described above also applies to FIGS. 4 to 7 described later.

[0049] As described above, the first flange portion 9 and the second flange portion 10 are in the shape of a quadrangular prism and each have a peripheral surface composed of a lower surface 11 and 12, a top surface, a first side surface 19 and 21, and a second side surface 20 and 22. On the other hand, the winding core portion 5 has a quadrangular cross section perpendicular to the axial direction 6, and four surfaces are formed on its peripheral surface. Therefore, for the four surfaces of the peripheral surface of the winding core portion 5 as well, the names of the surfaces facing in the same direction as each of the lower surface, top surface, first side surface, and second side surface of the flange portions 9 and 10 are similarly referred to as the "lower surface", "top surface", "first side surface", and "second side surface".

[0050] FIG. 2 shows the top surface 30 of the winding core portion 5 and shows the cross sections of the wires 3 and 4 on the top surface 30.

[0051] Referring to FIG. 2, the first wire 3 and the second wire 4 are wound in first winding regions Z1, second winding regions Z2, and third winding regions Z3, which are arranged along the axial direction 6 of the winding core portion 5 and have different winding modes from each other.

[0052] The first winding region Z1 includes (1-1) a first winding portion W1 (turns T1 to T16) in which the first wire 3 is wound from the first end 7 toward the second end 8 in the first layer, (1-2) a second winding portion W2 (turns T1 to T15) in which the second wire 4 is wound from the first end 7 toward the second end 8 in the second layer, (1-3) an intentional paragraph portion d1 (turn T16) in which the second wire 4 is wound in the first layer on the second end 8 side of the first winding portion W1. It has.

[0053] The second winding region Z2 includes (2-1) a third winding portion W3 (turns T17 to T23) in which the first wire 3 is wound from the first end 7 toward the second end 8 in the first layer, (2-2) an intentional paragraph portion d2 (turn T17) in which the second wire 4 is wound in the first layer on the first end 7 side of the third winding portion W3, (2-3) a fourth winding portion W4 (turns T18 to T23) in which the second wire 4 is wound from the first end 7 toward the second end 8 in the second layer. It has.

[0054] The third winding region Z3 includes (3-1) a fifth winding portion W5 (turns T24 to T30) in which the first wire 3 is wound from the first end 7 toward the second end 8 in the first layer, (3-2) a sixth winding portion W6 (turns T24 to T29) in which the second wire 4 is wound from the first end 7 toward the second end 8 in the second layer, (3-3) an intentional paragraph portion d3 (turn T30) in which the second wire 4 is wound in the first layer on the second end 8 side of the fifth winding portion W5. It has.

[0055] In the first winding region Z1, a +0.5 turn deviation region F1 is formed, which is deviated by 0.5 turns in the positive direction between the first wire 3 and the second wire 4.

[0056] In the second winding region Z2, a -1.5 turn shift region F2 is formed, which is shifted 1.5 turns in the negative direction between the first wire 3 and the second wire 4.

[0057] In the third winding region Z3, a +0.5 turn shift region F1 is formed, which is shifted 0.5 turns in the positive direction between the first wire 3 and the second wire 4.

[0058] From these, the influence of the parasitic capacitance generated between the first wire 3 and the second wire 4 can be reduced. For example, in a common mode choke coil, the mode conversion characteristics can be reduced.

[0059] Also, focusing on the wire located in the second layer, that is, in this embodiment, focusing on the second wire 4, the turns of the second wire 4 include non-contact turns T1, T18, and T24 where no wire is in contact at least on the side of the first end 7. For at least one of these non-contact turns T1, T18, and T24, in this embodiment, for all non-contact turns T1, T18, and T24, gaps S1, S2, and S3 are respectively provided between two adjacent turns of the wire located in the first layer that form recesses into which the respective non-contact turns T1, T18, and T24 fit.

[0060] More specifically, the recess into which the non-contact turn T1 of the second wire 4 fits is formed between the turn T1 and the turn T2 of the first wire 3, and a gap S1 is provided between the turn T1 and the turn T2 of the first wire 3.

[0061] The recess into which the non-contact turn T18 of the second wire 4 fits is formed between the turn T17 of the second wire 4 and the turn T17 of the first wire 3, and a gap S2 is provided between the turn T17 of the second wire 4 and the turn T17 of the first wire 3.

[0062] The recess into which the non-contact turn T24 of the second wire 4 fits is formed between the turn T24 and the turn T25 of the first wire 3, and a gap S3 is provided between the turn T24 and the turn T25 of the first wire 3.

[0063] The sizes of the gaps S1, S2, and S3 will be described with reference to FIGS. 3(A) and 3(B). FIGS. 3(A) and 3(B) illustrate the top surface 30 as a part of the circumferential surface of the bobbin portion 5, and also illustrate the wire A located in the first layer and the wire B located in the second layer. In order to clearly distinguish between the wire A and the wire B, the wire A is shaded. Also, for the purpose of the description here, since there is no need to distinguish between the gaps S1, S2, and S3 from each other, they are commonly referred to by the reference numeral "S".

[0064] FIG. 3(A) shows the lower limit of the size of the gap S, and FIG. 3(B) shows the upper limit of the size of the gap S. In FIGS. 3(A) and 3(B), the non-contact turn of the wire B is the turn b1, and the two adjacent turns of the wire A that form the recess into which this non-contact turn b1 fits are the turns a1 and a2. The diameters of the wires A and B are denoted as D.

[0065] Regarding the lower limit of the size of the gap S shown in FIG. 3(A), even if there is a gap S, when the gap S is small, the non-contact turn b1 of the wire B may not stably fit into the recess between the turns a1 and a2 of the wire A, and may inadvertently fall toward the first end portion 7 side. Therefore, in order to obtain the lower limit of the size of the gap S, the following experiment was conducted.

[0066] A coil component as a sample was produced, which included a wire having a diameter D of 56 μm, in which a 8-μm-thick electrically insulating coating was formed on a 40-μm-diameter linear center conductor made of copper. As a result of investigating the relationship between the occurrence rate of inadvertent falling and the size of the gap S for 1000 samples, inadvertent falling occurred in 6% of the entire samples. More specifically, among the 6% of the samples in which inadvertent falling occurred, When the size of the gap S measured in the axial direction 6 is less than 1 / 9×D, inadvertent paragraphing occurs in 3% of the samples. When the size of the gap S measured in the axial direction 6 is greater than or equal to 1 / 9×D and less than 1 / 7×D, inadvertent paragraphing occurs in 2% of the samples. When the size of the gap S measured in the axial direction 6 is greater than or equal to 1 / 7×D and less than 1 / 5×D, inadvertent paragraphing occurs in 1% of the samples. When the size of the gap S measured in the axial direction 6 is greater than or equal to 1 / 5×D, no samples with inadvertent paragraphing were observed.

[0067] From the above experimental results, the lower limit of the size of the gap S measured in the axial direction 6 was set to 1 / 5×D.

[0068] Next, the upper limit of the size of the gap S shown in Fig. 3(B) was defined as follows. It is necessary that the non-contact turn b1 of the wire B does not inadvertently paragraph between the turns a1 and a2 of the wire A, and the turn b2 of the wire B does not cross over the turn b1 toward the first end 7 side and stably fits into the recess between the turns a1 and a2 of the wire A. Therefore, as shown in Fig. 3(B), taking the line segment connecting the center of the turn a1 and the center of the turn a2 as the base, and drawing an isosceles triangle with the angle formed by the base and the hypotenuse being 30 degrees, the inventors of the present case found that it is appropriate to set the upper limit of the size of the gap S between the turns a1 and a2 formed when the turns a1 and a2 are arranged such that the center of the turn b1 comes to the position of the vertex of the isosceles triangle. That is, by setting the upper limit of the size of the gap S to (√3 - 1)×D, even if the turn b2 tries to move toward the turn b1 side, due to the presence of the turn b1, the turn b2 can only move up to directly above the turn a2 as shown by the dotted line in Fig. 3(B). For this reason, the turn b2 cannot cross over the turn a2, and it can be made easier to fit between the more stable turns a2 and a3.

[0069] As described above, the size L of the gap S measured in the axial direction 6 is 1 / 5×D ≤ L ≤ (√3 - 1)×D It is defined as such. If such conditions are met, it is possible to make it difficult for the non-contact turn b1 of the wire B located in the second layer to be displaced. Therefore, for at least one, and more preferably all, of the gaps S1, S2, and S3 shown in FIG. 2, by being configured to satisfy the condition of 1 / 5×D≦L≦(√3 - 1)×D, it is possible to make it difficult for the wire 4 located in the second layer to be displaced.

[0070] <Other Embodiments> Hereinafter, with reference to FIGS. 4 to 7, other embodiments in which the winding states of the first wire 3 and the second wire 4 are different will be described. FIGS. 4 to 7 are diagrams corresponding to FIG. 2. In FIGS. 4 to 7, elements corresponding to the elements shown in FIG. 2 are given the same reference numerals, and redundant descriptions are omitted.

[0071] [Second Embodiment] In the second embodiment shown in FIG. 4, the first wire 3 and the second wire 4 are wound in first winding regions Z1 and second winding regions Z2, respectively, which are arranged along the axial direction 6 of the winding core portion 5 and have different winding modes from each other.

[0072] The first winding region Z1 includes (1 - 1) a first winding portion W1 (turns T1 to T7) in which the first wire 3 is wound from the first end 7 to the second end 8 in the first layer, (1 - 2) a second winding portion W2 (turns T1 to T6) in which the second wire 4 is wound from the first end 7 to the second end 8 in the second layer, (1 - 3) an intentional paragraph portion d1 (turn T7) in which the second wire 4 is wound in the first layer on the second end 8 side of the first winding portion W1, (1 - 4) a third winding portion W3 (turns T8 to T9) in which the first wire 3 and the second wire 4 are wound from the first end 7 to the second end 8 in the first layer on the second end 8 side of the first winding portion W1 while being alternately arranged with respect to the axial direction 6, and has.

[0073] The second winding region Z2 includes (2-1) The fourth winding portion W4 (turns T10 to T16) in which the first wire 3 is wound from the first end portion 7 toward the second end portion 8 in the first layer, (2-2) The intentional paragraph portion d2 (turn T10) in which the second wire 4 is wound in the first layer on the second end portion 8 side of the third winding portion W3, (2-3) The fifth winding portion W5 (turns T11 to T16) in which the second wire 4 is wound from the first end portion 7 toward the second end portion 8 in the second layer, and having.

[0074] In the first winding region Z1, a +0.5 turn shift region F1 is formed in which there is a 0.5 turn shift in the positive direction between the first wire 3 and the second wire 4.

[0075] In the second winding region Z2, a -0.5 turn shift region F3 is formed in which there is a 0.5 turn shift in the negative direction between the first wire 3 and the second wire 4.

[0076] From these, the influence of the stray capacitance generated between the first wire 3 and the second wire 4 can be reduced, and for example, in a common mode choke coil, the mode conversion characteristics can be reduced.

[0077] Also, the turns of the second wire 4 include non-contact turns T1 and T11 where neither wire is in contact, at least on the first end portion 7 side. A gap S1 is provided between turns T1 and T2 of the first wire 3 that form a recess into which the non-contact turn T1 of the second wire 4 fits, and a gap S2 is provided between turns T10 and T11 of the first wire 3 that form a recess into which the non-contact turn T11 of the second wire 4 fits.

[0078] Also in this embodiment, the gaps S1 and S2, when measured in the axial direction 6, have a size L defined by 1 / 5×D≦L≦(√3 - 1)×D

[0079] [Third Embodiment] ​In the third embodiment shown in FIG. 5, the first wire 3 and the second wire 4 are wound in first and second winding regions Z1 and Z2, respectively, which are arranged along the axial direction 6 of the core portion 5 and have different winding patterns from each other.

[0080] The first winding region Z1 includes: (1-1) a first winding portion W1 (turns T1 to T16) in which the first wire 3 is wound from the first end 7 toward the second end 8 in the first layer; (1-2) a second winding portion W2 (turns T1 to T15) in which the second wire 4 is wound from the first end 7 toward the second end 8 in the second layer; (1-3) a first dislocation portion R1 (turn T15 → T16) in which the second wire 4 is redirected from the end on the second end 8 side of the second winding portion W2 toward the first end 7 side and guided to the position of the third layer; (1-4) a third winding portion W3 (turn T16) in which the second wire 4 is wound in the third layer following the first dislocation portion R1; (1-5) a second dislocation portion R2 (turn T1 → T17) in which the second wire 4 is guided from the third winding portion W3 to the position of the second layer. and has.

[0081] The second winding region Z2 includes: (2-1) a fourth winding portion W4 (turns T17 to T31) in which the first wire 3 is wound from the first end 7 toward the second end 8 in the first layer; (2-2) a fifth winding portion W5 (turns T17 to T30) in which the second wire 4 is wound from the first end 7 toward the second end 8 in the second layer following the second dislocation portion R2; (2-3) an intentional paragraph portion d (turn T31) in which the second wire 4 is wound in the first layer on the second end 8 side of the fourth winding portion W4. and has.

[0082] In the first winding region Z1, a +0.5 turn shift region F1 is formed in which the first wire 3 and the second wire 4 are shifted by 0.5 turns in the positive direction.

[0083] In the second winding region Z2, a -0.5 turn shift region F3 is formed, which is shifted by -0.5 turns in the negative direction between the first wire 3 and the second wire 4.

[0084] From these, the influence of the parasitic capacitance generated between the first wire 3 and the second wire 4 can be reduced. For example, in a common mode choke coil, the mode conversion characteristics can be reduced.

[0085] Also, the turns of the second wire 4 include non-contact turns T1 and T15 where neither wire is in contact, at least on the side of the first end portion 7. A gap S1 is provided between the turns T1 and T2 of the first wire 3 that form a recess into which the non-contact turn T1 of the second wire 4 fits, and a gap S2 is provided between the turns T15 and T16 of the first wire 3 that form a recess into which the non-contact turn T15 of the second wire 4 fits.

[0086] Also in this embodiment, the gaps S1 and S2, when measured in the axial direction 6, have a size L defined by 1 / 5×D≦L≦(√3 - 1)×D

[0087] Further, when the turn T15 of the second wire 4 fits between the turns T15 and T16 of the first wire 3 that form the above-described gap S2, as an inevitable result, gaps S3 and S4 are also formed on both sides of the turn T15 of the second wire 4. The turn T16 of the second wire 4 located in the aforementioned third layer fits into the gap S3, making it less likely to be displaced. These gaps S3 and S4 are slightly narrower than the gaps S1 and S2.

[0088] Although not particularly described, gaps that are inevitably formed due to gaps formed between turns of the wire located in the first layer, such as the gaps S3 and S4, are also formed in the embodiments shown in FIGS. 2 and 4.

[0089] [Fourth Embodiment] ​In the fourth embodiment shown in FIG. 6, the first wire 3 and the second wire 4 are wound in first and second winding regions Z1 and Z2, respectively, which are arranged along the axial direction 6 of the core portion 5 and have different winding patterns from each other.

[0090] The first winding region Z1 includes: (1-1) a first winding portion W1 (turns T1 to T17) in which the first wire 3 is wound from the first end portion 7 toward the second end portion 8 in the first layer; (1-2) a second winding portion W2 (turns T1 to T15) in which the second wire 4 is wound from the first end portion 7 toward the second end portion 8 in the second layer; (1-3) a first dislocation portion R1 (turn T15 → T16) in which the second wire 4 is redirected from the end portion on the second end portion 8 side of the second winding portion W2 toward the first end portion 7 side and guided to the position of the third layer; (1-4) a third winding portion W3 (turns T16 to T17) in which the second wire 4 is wound in the third layer following the first dislocation portion R1; (1-5) a second dislocation portion R2 (turn T17 → T18) in which the second wire 4 is guided from the third winding portion W3 to the position of the second layer; (1-6) a fourth winding portion W4 (turns T18 to T23) in which the first wire 3 is wound from the first end portion 7 toward the second end portion 8 in the first layer; (1-7) a fifth winding portion W5 (turns T18 to T23) in which the second wire 4 is wound from the first end portion 7 toward the second end portion 8 in the second layer following the second dislocation portion R2. It has.

[0091] The second winding region Z2 includes: (2-1) a sixth winding portion W6 (turns T24 to T30) in which the first wire 3 is wound from the first end portion 7 toward the second end portion 8 in the first layer; (2-2) a seventh winding portion W7 (turns T24 to T29) in which the second wire 4 is wound from the first end portion 7 toward the second end portion 8 in the second layer; (2-3) an intentional paragraph portion d (turn T30) in which the second wire 4 is wound in the first layer on the second end portion 8 side of the sixth winding portion W6. has.

[0092] In the first winding region Z1, a +0.5 turn shift region F1 where the first wire 3 and the second wire 4 are shifted by 0.5 turns in the positive direction, and a -1.5 turn shift region F2 where the first wire 3 and the second wire 4 are shifted by 1.5 turns in the negative direction are formed.

[0093] In the second winding region Z2, a +0.5 turn shift region F1 where the first wire 3 and the second wire 4 are shifted by 0.5 turns in the positive direction is formed.

[0094] From these, the influence of the parasitic capacitance generated between the first wire 3 and the second wire 4 can be reduced. For example, in a common mode choke coil, the mode conversion characteristics can be reduced.

[0095] Also, the turns of the second wire 4 include non-contact turns T1 and T14 where none of the wires are in contact, at least on the side of the first end portion 7. A gap S1 is provided between the turns T1 and T2 of the first wire 3 that form a recess into which the non-contact turn T1 of the second wire 4 fits, and a gap S2 is provided between the turns T14 and T15 of the first wire 3 that form a recess into which the non-contact turn T14 of the second wire 4 fits.

[0096] Also in this embodiment, the gaps S1 and S2, when measured in the axial direction 6, have a size L defined by 1 / 5×D≦L≦(√3 - 1)×D

[0097] Also, when the turn T14 of the second wire 4 fits between the turns T14 and T15 of the first wire 3 that form the above-described gap S2, inevitably, gaps S3 and S4 are formed on both sides of the turn T14 of the second wire 4. The turns T16 and T17 of the second wire 4 located in the third layer described above fit into the gaps S3 and S4, respectively, and are made less likely to be displaced. These gaps S3 and S4 are slightly narrower than the gaps S1 and S2. ​

[0098] In the fourth embodiment described above and the third embodiment described above, the number of turns of the second wire 4 located in the third layer is different. As can be understood from this, the number of turns of the wire located in the third layer can be arbitrarily changed as needed.

[0099] [Fifth Embodiment] In the fifth embodiment shown in FIG. 7, the first wire 3 and the second wire 4 are wound in first winding regions Z1, second winding regions Z2, and third winding regions Z3, which are arranged along the axial direction 6 of the core portion 5 and have different winding modes.

[0100] The first winding region Z1 includes: (1-1) a first winding portion W1 (turns T1 to T9) in which the first wire 3 is wound from the first end 7 to the second end 8 in the first layer; (1-2) a second winding portion W2 (turns T1 to T5) in which the second wire 4 is wound from the first end 7 to the second end 8 in the second layer; (1-3) a first dislocation portion R1 (turns T5→T6) in which the second wire 4 is redirected from the end on the second end 8 side of the second winding portion W2 to the first end 7 side and guided to the position of the third layer; (1-4) a third winding portion W3 (turn T6) in which the second wire 4 is wound in the third layer following the first dislocation portion R1; (1-5) a second dislocation portion R2 (turns T6→T7) in which the second wire 4 is guided from the third winding portion W3 to the position of the second layer; (1-6) a fourth winding portion W4 (turns T7 to T9) in which the second wire 4 is wound in the second layer following the second dislocation portion R2. and has.

[0101] The second winding region Z2 includes: (2-1) a fifth winding portion W5 (turns T10 to T19) in which the first wire 3 is wound from the first end 7 to the second end 8 in the first layer; (2-2) The sixth winding portion W6 (turns T10 to T15) in which the second wire 4 is wound from the first end portion 7 toward the second end portion 8 in the second layer, (2-3) The third dislocation portion R3 (turn T15 → T16) in which the second wire 4 is redirected from the end portion on the second end portion 8 side of the sixth winding portion W6 toward the first end portion 7 side and guided to the position of the third layer, (2-4) The seventh winding portion W7 (turns T16 to T17) in which the second wire 4 is wound in the third layer following the third dislocation portion R3, (2-5) The fourth dislocation portion R4 (turn T17 → T18) in which the second wire 4 is guided from the seventh winding portion W7 to the position of the second layer, (2-6) The eighth winding portion W8 (turns T18 to T19) in which the second wire 4 is wound from the first end portion 7 toward the second end portion 8 in the second layer following the fourth dislocation portion R4, It has.

[0102] The third winding region Z3 is (3-1) The ninth winding portion W9 (turns T20 to T28) in which the first wire 3 is wound from the first end portion 7 toward the second end portion 8 in the first layer, (3-2) The tenth winding portion W10 (turns T20 to T24) in which the second wire 4 is wound from the first end portion 7 toward the second end portion 8 in the second layer, (3-3) The fifth dislocation portion R5 (turn T24 → T25) in which the second wire 4 is redirected from the end portion on the second end portion 8 side of the tenth winding portion W10 toward the first end portion 7 side and guided to the position of the third layer, (3-4) The eleventh winding portion W11 (turn T25) in which the second wire 4 is wound in the third layer following the fifth dislocation portion R5, (3-5) The sixth dislocation portion R6 (turn T25 → T26) in which the second wire 4 is guided from the eleventh winding portion W11 to the position of the second layer, (3-6) The twelfth winding portion W12 (turns T26 to T28) in which the second wire 4 is wound from the first end portion 7 toward the second end portion 8 in the second layer following the sixth dislocation portion R6, It has.

[0103] In the first winding region Z1, a +0.5 turn shift region F1 where the first wire 3 and the second wire 4 are shifted by 0.5 turns in the positive direction, and a -0.5 turn shift region F3 where the first wire 3 and the second wire 4 are shifted by 0.5 turns in the negative direction are formed.

[0104] In the second winding region Z2, a +0.5 turn shift region F1 where the first wire 3 and the second wire 4 are shifted by 0.5 turns in the positive direction, and a -1.5 turn shift region F2 where the first wire 3 and the second wire 4 are shifted by 1.5 turns in the negative direction are formed.

[0105] In the third winding region Z3, a +0.5 turn shift region F1 where the first wire 3 and the second wire 4 are shifted by 0.5 turns in the positive direction, and a -0.5 turn shift region F3 where the first wire 3 and the second wire 4 are shifted by 0.5 turns in the negative direction are formed.

[0106] From these, the influence of the parasitic capacitance generated between the first wire 3 and the second wire 4 can be reduced. For example, in a common mode choke coil, the mode conversion characteristics can be reduced.

[0107] Also, the turns of the second wire 4 include non-contact turns T1, T5, T10, T14, T20, and T24 where none of the wires are in contact, at least on the side of the first end portion 7.

[0108] A gap S1 is provided between turn T1 and turn T2 of the first wire 3 that forms a recess into which the non-contact turn T1 of the second wire 4 fits.

[0109] A gap S2 is provided between turn T5 and turn T6 of the first wire 3 that forms a recess into which the non-contact turn T5 of the second wire 4 fits.

[0110] A gap S3 is provided between turn T10 and turn T11 of the first wire 3 that forms a recess into which the non-contact turn T10 of the second wire 4 fits.

[0111] A gap S4 is provided between turns T14 and T15 of the first wire 3 that forms a recess into which the non-contact turn T14 of the second wire 4 fits.

[0112] A gap S5 is provided between turns T20 and T21 of the first wire 3 that forms a recess into which the non-contact turn T20 of the second wire 4 fits.

[0113] A gap S6 is provided between turns T24 and T25 of the first wire 3 that forms a recess into which the non-contact turn T24 of the second wire 4 fits.

[0114] Also in this embodiment, the gaps S1 to S6, when measured in the axial direction 6, have a size L defined by 1 / 5×D≦L≦(√3 - 1)×D and are of this size L.

[0115] Due to the formation of the gaps S1 to S6 in the first layer described above, inevitably, gaps are also formed at corresponding positions in the second layer. Turns T6, T16, T17, and T25 of the second wire 4 located in the third layer fit into the gaps S7, S8, S9, and S10 inevitably formed in the second layer, respectively, making it difficult for misalignment to occur. These gaps S7 to S10 are slightly narrower than gaps S1 and S2.

[0116] In the fifth embodiment described above, in each of the plurality of winding regions Z1 to Z3, the number of windings of the second wire 4 located in the third layer is not the same for each. As can be seen from this, the number of windings of the wire located in the third layer may be different for each winding region.

[0117] Among the first to fifth embodiments described above, in the third to fifth embodiments, among the gaps between a plurality of turns of the wire located in the first layer, the gap with a size L defined by 1 / 5×D≦L≦(√3 - 1)×D is the largest.

[0118] Further, in the third to fifth embodiments, a plurality of turns of the wire located in the first layer are in contact with each other between adjacent turns except for the gap of size L defined by 1 / 5×D≦L≦(√3 - 1)×D.

[0119] Further, in the third to fifth embodiments, a second gap is formed between the non-contact turn in the second layer and the turns respectively adjacent to the first end side and the second end side of the non-contact turn.

[0120] Note that not all of the non-contact turns of the wire located in the second layer need to fit into the gaps between the turns of the wire located in the first layer and having a gap of size L defined by 1 / 5×D≦L≦(√3 - 1)×D.

[0121] Also, in the illustrated embodiment, the first wire 3 is wound in the first layer and most of the second wire 4 is wound in the second layer, but the first wire 3 and the second wire 4 may be interchanged between a plurality of winding regions arranged along the axial direction 6 of the winding core portion 5.

[0122] As described above, the present invention has been described in relation to embodiments related to coil components constituting a common mode choke coil. However, the present invention can also be applied to, for example, wound type chip transformers.

[0123] Also, each of the illustrated embodiments is exemplary, and partial substitution or combination of configurations is possible between different embodiments.

[0124] The present invention has the following embodiments.

[0125] <1> A core including a winding core portion having first and second ends opposite to each other in the axial direction, and A first wire and a second wire, each having a circular cross-section with a diameter D, spirally wound around the core portion from the first end portion toward the second end portion with substantially the same number of turns around the core portion; comprising: One of the first wire and the second wire includes a portion wound in a state of forming a first layer that is the layer closest to the circumferential surface of the core portion; The other of the first wire and the second wire includes a portion wound on the outer peripheral side of the first layer while fitting into a recess formed between adjacent turns of the wire located in the first layer, in a state of forming a second layer that is the layer wound while fitting into the recess formed between adjacent turns of the wire located in the first layer; Regarding the positional relationship between the turns of the wire located in the first layer and the turns of the wire located in the second layer, when the turns of the wire located in the second layer are on the second end side from the turns of the wire located in the first layer of the same number counted from the first end side, it is defined as a positive shift, and in the reverse case, as a negative shift, there are a positive shift region where the turns are shifted in the positive direction and a negative shift region where the turns are shifted in the negative direction between the first wire and the second wire; The turns of the wire located in the second layer include non-contact turns where at least on the first end side, none of the wires located in the second layer are in contact, and for at least one of the non-contact turns, the gap between two adjacent turns of the wire located in the first layer that forms the recess into which the non-contact turn fits, measured in the axial direction, has a size L defined by 1 / 5×D≦L≦(√3 - 1)×D and; a coil component.

[0126] <2> The coil component according to <1>, wherein among the gaps between a plurality of turns of the wire located in the first layer, the gap having the size L is the largest.

[0127] <3> The coil component according to <2>, wherein the plurality of turns of the wire located in the first layer are in contact with each other between adjacent ones except between two adjacent turns that form the gap having the size L.

[0128] <4> The non-contact turn that fits between two turns having a gap of size L is the turn closest to the first end side of the wire located in the second layer, and is the coil component according to any one of <1> to <3>.

[0129] <5> The first wire and the second wire are each wound in a plurality of winding regions arranged along the axial direction of the bobbin core portion and having different winding patterns from each other, and the non-contact turn that fits between two turns having a gap of size L is the turn closest to the first end side of the wire located in the second layer in each of the winding regions, and is the coil component according to any one of <1> to <4>.

[0130] <6> Two adjacent turns of the wire located in the first layer that form the recess into which the non-contact turn fits are turns formed by either the first wire or the second wire, and are the coil component according to any one of <1> to <5>.

[0131] <7> Either one of two adjacent turns of the wire located in the first layer that form the recess into which the non-contact turn fits is a turn formed by the first wire, and the other is a turn formed by the second wire, and is the coil component according to any one of <1> to <5>.

[0132] <8> A second gap is formed between the non-contact turn in the second layer and the turns respectively adjacent to the first end side and the second end side of the non-contact turn, and is the coil component according to any one of <1> to <7>.

[0133] <9> Either the first wire or the second wire is wound on the outer peripheral side of the second layer while fitting into a second recess formed between adjacent turns of the wires located in the second layer in a part of the winding range of the wires located in the second layer, including a part wound in a state of forming a third layer which is a layer wound while fitting into the second recess formed between adjacent turns of the wires located in the second layer in a part of the winding range of the wires located in the second layer, At least one turn of the wire located in the third layer fits into the second gap. The coil component according to <8>.

Explanation of reference numerals

[0134] 1 Coil component 2 Core 3 First wire 4 Second wire 5 Winding core part 6 Axial direction 7 First end 8 Second end 34 Second part 35 Fourth part Z1, Z2, Z3 Winding regions S1~S10 Gaps F1 +0.5 turn deviation region F2 -1.5 turn deviation region F3 -0.5 turn deviation region

Claims

1. A core including a spool portion having first and second ends opposite to each other in the axial direction, a first wire and a second wire having a circular cross-section with a diameter D, which are spirally wound around the spool portion from the first end to the second end with substantially the same number of turns, comprising: One of the first wire and the second wire includes a portion wound in a state of forming a first layer, which is the layer closest to the peripheral surface of the spool portion, The other of the first wire and the second wire includes a portion wound on the outer peripheral side of the first layer while fitting into a recess formed between adjacent turns of the wire located in the first layer, in a state of forming a second layer, which is the layer wound while fitting into the recess formed between adjacent turns of the wire located in the first layer, Regarding the positional relationship between the turns of the wire located in the first layer and the turns of the wire located in the second layer, when the turns of the wire located in the second layer are on the second end side of the turns of the wire located in the first layer of the same number, it is defined as a positive shift, and when it is the reverse, it is defined as a negative shift, there are a positive shift region where the turns shift in the positive direction and a negative shift region where the turns shift in the negative direction between the first wire and the second wire, The turns of the wire located in the second layer include non-contact turns that are not in contact with any wire located in the second layer, at least on the first end side, and for at least one of the non-contact turns, the gap between two adjacent turns of the wire located in the first layer that form the recess into which the non-contact turn fits, measured in the axial direction, has a size L defined by 1 / 5×D ≦ L ≦ (√3−1)×D and a coil component.

2. The coil component according to claim 1, wherein among the gaps between a plurality of turns of the wire located in the first layer, the gap of the size L is the largest.

3. The coil component according to claim 2, wherein the plurality of turns of the wire located in the first layer are in contact with each other between adjacent ones, except between two adjacent turns that form the gap of the size L.

4. The coil component according to claim 1, wherein the non-contact turn that fits between two turns having the gap of the size L is the turn of the wire located in the second layer that is closest to the first end side.

5. The first wire and the second wire are each wound in a plurality of winding regions arranged along the axial direction of the core portion and having different winding modes, and the non-contact turn that fits between two turns having a gap of the size L is the turn closest to the first end side of the wire located in the second layer in each of the winding regions. The coil component according to claim 1.

6. Two adjacent turns of the wire located in the first layer forming the recess into which the non-contact turn fits are turns formed by either the first wire or the second wire. The coil component according to claim 1.

7. Either one of two adjacent turns of the wire located in the first layer forming the recess into which the non-contact turn fits is a turn formed by the first wire, and the other is a turn formed by the second wire. The coil component according to claim 1.

8. A second gap is formed between the non-contact turn in the second layer and the turns respectively adjacent to the first end side and the second end side of the non-contact turn. The coil component according to any one of claims 1 to 7.

9. Either the first wire or the second wire includes a portion wound in a state of constituting a third layer, which is a layer wound around the outer peripheral side of the second layer while fitting into a second recess formed between adjacent turns of the wire located in the second layer in a part of the winding range of the wire located in the second layer. At least one turn of the wire located in the third layer fits into the second gap. The coil component according to claim 8.

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