Coil component

Abstract

To change a difference in the number of turns between a first wire and a second wire in contact with each other while requiring possibly smaller space in a direction along a central axis.SOLUTION: An m-th turn (m: a positive integer) and a (m+1)-th turn of a first wire 50 belong to a first layer L1, and an n-th turn (n: an integer equal to or more than m+2) of the first wire 50 has a first portion 71 belonging to a second layer L2 wound around a valley portion between the m-th turn and the (m+1)-th turn of the first wire 50 from outside in a direction orthogonal to a central axis X. The second wire 60 has at least one or more turns wound around the first portion 71 adjacent to a first flange 21 side in a direction along the central axis X, and has at least one or more turns wound around the first portion 71 on a second flange 31 side. An a-th turn (a: an integer equal to or more than 2) of the second wire 60 has a second portion 72 belonging to a third layer L3.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a coil component. [Background technology]

[0002] The coil component described in Patent Document 1 includes a winding core, a first flange, and a second flange. The winding core is shaped like a rectangular pillar. The first flange is connected to a first end of the winding core. The second flange is connected to a second end of the winding core. The coil component also includes four external electrodes, a first wire, and a second wire. Two of the four external electrodes are located on the surface of the first flange. The remaining two external electrodes are located on the surface of the second flange.

[0003] The first wire is wound around the winding core. A first end of the first wire is connected to the external electrode on the first flange. A second end of the first wire is connected to the external electrode on the second flange. The second wire is wound around the winding core. A first end of the second wire is connected to the external electrode on the first flange. A second end of the second wire is connected to the external electrode on the second flange. The second wire is wound generally around the outside of the first wire in the same direction as the first wire. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-120887 Summary of the Invention [Problem to be solved by the invention]

[0005] In a coil component such as that described in Patent Document 1, stray capacitance can occur at the point where the wires contact each other. Furthermore, the greater the difference in the number of turns between the first wire and the second wire at the contact point, the greater the stray capacitance. The coil component described in Patent Document 1 has a portion where the second wire and the first wire intersect in order to change the difference in the number of turns between the contacting first and second wires. However, the coil component described in Patent Document 1 requires a large amount of space along the central axis near the intersection point to allow the wires to intersect. For this reason, a design that changes the difference in the number of turns between the contacting first and second wires while minimizing the space required along the central axis is desirable. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a winding core, comprising: a winding core; a first flange provided at a first end of the winding core in a direction along the central axis; a second flange provided at a second end of the winding core opposite to the first end; first and second external electrodes provided at the first flange; third and fourth external electrodes provided at the second flange; a first wire wound around the winding core, the first end connected to the first external electrode and the second end connected to the third external electrode; and a second wire wound around the winding core in the same direction as the first wire, the first end connected to the second external electrode and the second end connected to the fourth external electrode, wherein the number of turns of the first wire and the second wire increases by one for each full turn around the central axis from the first end toward the second end, and a portion directly wound around the winding core is defined as a first layer, and a portion of the first layer wound around the central axis is defined as a second layer. the m-th turn (where m is a positive integer) and the (m+1)-th turn of the first wire have a portion that belongs to the first layer, the n-th turn (where n is an integer equal to or greater than m+2) of the first wire have a first portion that belongs to the second layer and is wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the m-th turn and the (m+1)-th turn of the first wire, the second wire have at least one turn wound on the first flange side with respect to the first portion in the direction along the central axis and at least one turn wound on the second flange side with respect to the first portion in the direction along the central axis, and the a-th turn (where a is an integer equal to or greater than 2) of the second wire have a second portion that belongs to the third layer. [Effects of the Invention]

[0007] According to the above configuration, the difference in the number of turns between the contacting first wire and second wire can be changed without requiring as much space as possible in the direction along the central axis of the winding core. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a coil component according to a first embodiment. [Figure 2] FIG. 2 is a schematic end view showing a part of the coil component of the first embodiment, which includes the central axis and is orthogonal to the left-right axis. [Figure 3] FIG. 3 is a schematic end view showing a part of the coil component according to the second embodiment, which includes the central axis and is orthogonal to the left-right axis. [Figure 4] FIG. 4 is a schematic end view showing a part of a modified coil component including the central axis and perpendicular to the left-right axis. [Figure 5] FIG. 5 is a schematic end view showing a portion of a modified coil component that includes the central axis and is perpendicular to the left-right axis. [Figure 6] FIG. 6 is a schematic end view showing a portion of a modified coil component that includes the central axis and is perpendicular to the left-right axis. [Figure 7] FIG. 7 is a schematic end view showing a part of a coil component of a modified example that includes the central axis and is orthogonal to the left-right axis. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, first and second embodiments of the coil device will be described with reference to the drawings. Note that the drawings may show components enlarged to facilitate understanding. The dimensional ratios of the components may differ from those in the actual drawings or from those in other drawings.

[0010] (First embodiment) <Overall structure> As shown in FIG. 1, the coil device 10 includes a drum core 10C and a planar core 10F.

[0011] The drum core 10C has a winding core portion 11, a first flange portion 21, and a second flange portion 31. The winding core 11 has a rectangular prism shape and is made of a material such as Ni-Zn ferrite.

[0012] The first flange 21 is provided at a first end of the winding core 11 in the direction along the central axis X. Specifically, the first flange 21 is connected to the first end of the winding core 11 in the direction along the central axis X. The second flange 31 is provided at a second end of the winding core 11 in the direction along the central axis X. Specifically, the second flange 31 is connected to the second end of the winding core 11 in the direction along the central axis X. The first flange 21 and the second flange 31 are made of the same material as the winding core 11. Furthermore, the first flange 21 and the second flange 31 are integrally molded with the winding core 11.

[0013] Here, a specific axis perpendicular to the central axis X is referred to as the vertical axis Y. In the first embodiment, the vertical axis Y is a direction perpendicular to the mounting surface when the coil component 10 is mounted on a substrate. When viewed in a direction along the central axis X, the vertical axis Y is parallel to the short side of the winding core portion 11. An axis perpendicular to both the central axis X and the vertical axis Y is referred to as the left-right axis Z. In the first embodiment, when viewed in a direction along the central axis X, the left-right axis Z is parallel to the long side of the winding core portion 11. One of the directions along the central axis X is referred to as the positive direction X1, and the direction opposite to the positive direction X1 is referred to as the negative direction X2. In the first embodiment, the positive direction X1 coincides with the direction from the winding core portion 11 toward the first flange portion 21. The negative direction X2 coincides with the direction from the winding core portion 11 toward the second flange portion 31. Furthermore, one of the directions along the vertical axis Y is referred to as the upward direction Y1, and the direction opposite to the upward direction Y1 is referred to as the downward direction Y2. Furthermore, one of the directions along the left-right axis Z is referred to as the rightward direction Z1, and the direction opposite to the rightward direction Z1 is referred to as the leftward direction Z2. Note that the upward direction Y1 and downward direction Y2 mentioned here are named for convenience and do not specify the direction of gravity. Furthermore, the rightward direction Z1 and leftward direction Z2 are named for convenience and do not limit the left-right direction from a particular viewpoint.

[0014] In this disclosure, the term "upper surface" refers to a surface facing the upward direction Y1 along the vertical axis Y, and the term "lower surface" refers to a surface facing the downward direction Y2. The "upper surface" does not necessarily have to be perpendicular to the upward direction Y1. For example, the "upper surface of the coil device 10" refers to a surface that can be seen when the coil device 10 is viewed from the upward direction Y1 toward the downward direction Y2. The same applies to the lower surface.

[0015] When viewed in a direction along the central axis X, the first flange portion 21 protrudes outward relative to the winding core portion 11 in directions along the vertical axis Y and the horizontal axis Z. The first flange portion 21 has a shape that is plane-symmetrical with respect to an imaginary plane that includes the central axis X and is perpendicular to the horizontal axis Z.

[0016] The first flange 21 has a main body 22 and a recess 23. The main body 22 is generally rectangular and has a thin thickness in the direction along the central axis X. When viewed in the negative direction X2, both edges of the main body 22 on the upper Y1 side and the lower Y2 side are parallel to the left-right axis Z. When viewed in the negative direction X2, both edges of the main body 22 on the left Z2 side and the right Z1 side are parallel to the up-down axis Y.

[0017] The recessed portion 23 is recessed downward in the Y2 direction from the upper surface of the main body portion 22. The dimension of the recessed portion 23 along the left-right axis Z decreases as it goes downward in the Y2 direction. The recessed portion 23 is located approximately in the center of the main body portion 22 in the direction along the left-right axis Z. The dimension of the recessed portion 23 along the central axis X is the same as the dimension of the main body portion 22 in the direction along the central axis X. In other words, a portion of the first flange portion 21 on the upward Y1 side has a bifurcated shape with the recessed portion 23 in between.

[0018] The second flange 31 and the first flange 21 are symmetrical with respect to an imaginary plane that passes through the center of the winding core 11 and is perpendicular to the central axis X. That is, when viewed from the direction along the central axis X, the second flange 31 protrudes outward from the winding core 11 in the directions along the vertical axis Y and the horizontal axis Z. The second flange 31 has a main body 32 and a recessed portion 33. The main body 32 and the recessed portion 33 of the second flange 31 are configured similarly to the main body 22 and the recessed portion 23 of the first flange 21. That is, the recessed portion 33 is recessed downward in the Y2 direction from the top surface of the main body 32.

[0019] The plate core 10F has a rectangular plate shape. The long sides of the plate core 10F are parallel to the central axis X. The short sides of the plate core 10F are parallel to the left-right axis Z. The plate core 10F is located on the downward direction Y2 side of the drum core 10C. The plate core 10F is connected to both the lower surface of the first flange portion 21 and the lower surface of the second flange portion 31. In other words, the plate core 10F is bridged between the first flange portion 21 and the second flange portion 31. The material of the plate core 10F is the same as the material of the drum core 10C.

[0020] The coil component 10 includes a first external electrode 41, a second external electrode 42, a third external electrode 43, and a fourth external electrode 44. The first external electrode 41 is provided on the first flange 21. That is, the first external electrode 41 is attached to the surface of the first flange 21. The first external electrode 41 is located on the surface of the first flange 21 on the upward Y1 side, and on the leftward Z2 side with respect to the recess 23.

[0021] The second external electrode 42 is provided on the first flange 21. That is, the second external electrode 42 is attached to the surface of the first flange 21. The second external electrode 42 is located on the surface of the first flange 21 on the upward Y1 side, and on the rightward Z1 side with respect to the recess 23.

[0022] The third external electrode 43 is provided on the second flange 31. That is, the third external electrode 43 is attached to the surface of the second flange 31. The third external electrode 43 is located on the surface of the second flange 31 on the upward Y1 side and on the leftward Z2 side with respect to the recess 33.

[0023] The fourth external electrode 44 is provided on the second flange 31. That is, the fourth external electrode 44 is attached to the surface of the second flange 31. The fourth external electrode 44 is located on the surface of the second flange 31 on the upward Y1 side, and on the rightward Z1 side with respect to the recess 33.

[0024] Although not shown in the figures, the first to fourth external electrodes 41 to 44 have a metal layer and a plating layer. The metal layer is, for example, a layer mainly composed of silver. The plating layer is made up of a plurality of layers, for example, a layer mainly composed of copper, a layer mainly composed of nickel, and a layer mainly composed of tin. In this embodiment, the surface of the coil component 10 on which the first to fourth external electrodes 41 to 44 are provided is the surface that faces the substrate when the coil component 10 is mounted on the substrate. In FIG. 1, the first to fourth external electrodes 41 to 44 are shown by dashed dotted lines.

[0025] <Configuration of the first wire and second wire> As shown in Fig. 1, the coil device 10 includes a first wire 50 and a second wire 60. The first wire 50 and the second wire 60 have portions wound around a winding core 11. Note that Fig. 1 simplifies the winding structure of the portions of the first wire 50 and the second wire 60 wound around the winding core 11, and illustrates each turn of each wire as if they were an integrated cylindrical object.

[0026] Although not shown in the figures, the first wire 50 has a conductor and an insulating coating. The insulating coating covers the outer surface of the conductor. The first wire 50 has a substantially circular shape in a cross section perpendicular to the direction in which the first wire 50 extends. The first wire 50 has a first end 51 and a second end 52 opposite the first end 51. In each figure, the first wire 50 is colored with dots.

[0027] 1 , a first end 51 of the first wire 50 is connected to the first external electrode 41. A second end 52 of the first wire 50 is connected to the third external electrode 43. Here, when tracing the first wire 50 from the first end 51 to the second end 52, the point where the first wire 50 first comes into contact with the outer circumferential surface of the winding core portion 11 is defined as the 1.0 turn point of the first wire 50. In the first embodiment, the 1.0 turn point of the first wire 50 is located on the ridgeline on the rightward Z1 side and upward Y1 side of the winding core portion 11.

[0028] As shown in FIG. 2 , the number of turns of the first wire 50 increases by one each time the first wire 50 makes one full turn around the central axis X from the first end 51 to the second end 52. When viewed in the negative direction X2, the first wire 50 is wound around the winding core 11 so that the number of turns increases clockwise. Therefore, for example, when viewed in the negative direction X2, a point 36 degrees from the 1.0 turn point of the first wire 50 around the central axis X is the 1.1 turn point of the first wire 50. The first turn of the first wire 50 refers to the portion of the first wire 50 from the 1.0 turn point to just before the 2.0 turn point. Note that in FIGS. 2 to 7 , any point within the first turn is represented as “1.” The same applies to other numbers of turns. The number of turns shown in FIG. 2 does not necessarily have to match the number of turns counted from the start of winding during manufacturing.

[0029] As shown in FIG. 1, the second wire 60 has the same configuration as the first wire 50. That is, the second wire 60 has a conductor and an insulating coating. The insulating coating covers the outer surface of the conductor. The second wire 60 has a substantially circular shape in a cross section perpendicular to the direction in which the second wire 60 extends. The second wire 60 has a first end 61 and a second end 62 opposite the first end 61.

[0030] 1 , a first end 61 of the second wire 60 is connected to the second external electrode 42. A second end 62 of the second wire 60 is connected to the fourth external electrode 44. Here, when tracing the second wire 60 from the first end 61 to the second end 62, the first point whose angular position about the central axis X matches the angular position of the 1.0 turn point of the first wire 50 is defined as the 1.0 turn point of the second wire 60. That is, in the first embodiment, when viewed in a direction along the central axis X, the 1.0 turn point of the second wire 60 is located on a straight line connecting the ridge line on the rightward direction Z1 side and upward direction Y1 side of the winding core portion 11 and the central axis X.

[0031] 2, the number of turns of the second wire 60 increases by one each time the second wire 60 makes one revolution around the central axis X from the first end 61 to the second end 62. When viewed in the negative direction X2, the second wire 60 is wound around the winding core 11 so that the second wire 60 progresses clockwise as the number of turns increases.

[0032] With regard to the first wire 50 and the second wire 60, the portion that is wound directly around the winding core 11 is referred to as the first layer L1. Here, "wound directly" does not only refer to a state in which the wire is in contact with the outer peripheral surface of the winding core 11, but also includes a state in which the wire is wound around the winding core 11 without any other wire between them, even if the wire is floating relative to the winding core 11.

[0033] Furthermore, with regard to the first wire 50 and the second wire 60, the portion wound from the outside in a direction perpendicular to the central axis X around the valley portion formed by two adjacent turns of the first layer L1 in the direction along the central axis X is referred to as the second layer L2.

[0034] Furthermore, with respect to the first wire 50 and the second wire 60, the portion wound from the outside in a direction perpendicular to the central axis X around the valley portion formed by two adjacent turns of the second layer L2 in the direction along the central axis X is defined as the third layer L3.

[0035] <Regarding the Wire Winding Mode of the First Embodiment> As shown in FIG. 2 , the first to mid-ninth turns of the first wire 50 belong to the first layer L1. The first to ninth turns of the first wire 50 are wound in order such that the increasing number of turns is closer to the second flange 31 in the direction along the central axis X. Furthermore, the first to ninth turns of the first wire 50 are wound adjacent to each other in the direction along the central axis X. Here, "wound adjacent to each other" does not necessarily mean that the turns of adjacent wires are in contact with each other. Even if the turns of adjacent wires are not in contact with each other, they can still be said to be adjacent as long as there is no other wire on the line connecting the central axes of the adjacent wires when viewed in cross section.

[0036] The tenth turn of the first wire 50 has a first portion 71 belonging to the second layer L2. Specifically, the first portion 71 is wound from the outside in a direction perpendicular to the central axis X with respect to the valley portion between the eighth and ninth turns of the first wire 50. Therefore, the first wire 50 has a state in which the spiral pitch becomes negative in the portion from the ninth turn to the tenth turn. In this way, when n is 10 and m is 8 (n = m + 2), the nth turn of the first wire 50 has the first portion 71 wound from the outside in a direction perpendicular to the central axis X with respect to the valley portion between the mth turn and the (m + 1)th turn of the first wire 50. Note that the portion of the first portion 71 that runs onto the second layer L2 does not have to be exactly at the 10.0th turn. For example, the portion of the first portion 71 that runs onto the second layer L2 may be after the 10.0th turn. In this case, a portion of the 10th turn of the first wire 50, including the 10.0 turn, may belong to the first layer L1. Also, a portion of the 11th turn of the first wire 50, including the 11.0 turn, may be continuous with the first portion 71 and belong to the second layer L2. In this case, a portion of the 11th turn of the first wire 50 may belong to the second layer L2. Also, a portion of the first wire 50 just before the 10.0 turn may be continuous with the first portion 71 and belong to the second layer L2. In this case, a portion of the 9th turn of the first wire 50 may belong to the second layer L2.

[0037] The 11th turn of the first wire 50 has a portion that belongs to the first layer L1. The 11th turn of the first wire 50 is wound adjacent to the 9th turn of the first wire 50 on the second flange portion 31 side in the direction along the central axis X. Therefore, the helical pitch of the first wire 50 is larger in the portion from the 10th turn to the 11th turn than in other portions.

[0038] The twelfth to fifteenth turns of the first wire 50 belong to the first layer L1. The twelfth turn of the first wire 50 is wound adjacent to the eleventh turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. The twelfth to fifteenth turns of the first wire 50 are wound in order such that the greater the number of turns, the closer to the second flange 31 in the direction along the central axis X. The twelfth to fifteenth turns of the first wire 50 are wound adjacent to each other in the direction along the central axis X.

[0039] The 16th turn of the first wire 50 has a portion wound around the winding core 11 and a portion that is separated from the winding core 11 and connected to the third external electrode 43. The portion of the 16th turn of the first wire 50 that is wound around the winding core 11 belongs to the first layer L1. This portion of the 16th turn of the first wire 50 is wound adjacent to the 15th turn of the first wire 50 on the second flange 31 side in the direction along the central axis X.

[0040] The first turn of the second wire 60 has a portion belonging to the first layer L1. This portion is wound adjacent to the first turn of the first wire 50 on the first flange 21 side in the direction along the central axis X.

[0041] The second turn to the middle of the eighth turn of the second wire 60 belong to the second layer L2. Note that a part of the second turn of the first wire 50 may belong to the first layer L1.

[0042] The second wire 60 is wound such that the second wire 60 is positioned closer to the second flange 31 in the direction along the central axis X as the number of turns increases. The second wire 60 is wound such that the second wire 60 is wound adjacent to the first flange 31 in the direction along the central axis X as the number of turns increases. The second wire 60 is wound such that the second wire 60 is wound adjacent to the first flange 21 in the direction along the central axis X. The second wire 60 is wound from the outside of the valley portion between the first and second turns of the first wire 50 in a direction perpendicular to the central axis X. That is, the i-th turn (where i is an integer between 2 and 8) of the second wire 60 is wound from the outside of the valley portion between the (i-1)-th turn of the first wire 50 and the i-th turn in the direction perpendicular to the central axis X. The eighth turn of the second wire 60 has a portion wound adjacent to the tenth turn of the first wire 50 on the first flange 21 side. That is, the eighth turn of the second wire 60 has a portion wound on the first flange 21 side with respect to the first portion 71 in the direction along the central axis X. In other words, the second wire 60 has at least one turn wound on the first flange 21 side with respect to the first portion 71 in the direction along the central axis X.

[0043] As described above, the first to ninth turns of the first wire 50 are wound such that the greater the number of turns, the closer the turn is to the second flange 31 in the direction along the central axis X. Therefore, the i-th turn of the second wire 60, which is wound around the valley portion between the (i-1)th turn and the i-th turn of the first wire 50, is located closer to the first flange 21 in the direction along the central axis X than the i-th turn of the first wire 50. In other words, when comparing the same turns of the first wire 50 and the second wire 60, in the second to eighth turns, the second wire 60 is located closer to the first flange 21 in the direction along the central axis X than the same turn of the first wire 50. Note that "the second wire 60 is located on the first flange portion 21 side relative to the first wire 50" means that when each wire is viewed from the end as in Figure 2, the center of each turn of the second wire 60 is located on the first flange portion 21 side relative to the center of each turn of the first wire 50 in the direction along the central axis X.

[0044] The ninth turn of the second wire 60 has a second portion 72 that belongs to the third layer L3. Specifically, the second portion 72 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the eighth turn of the second wire 60 and the tenth turn of the first wire 50. In this manner, when a is 9, the a-th turn of the second wire 60 has the second portion 72 that belongs to the third layer L3. Note that a portion of the ninth turn of the second wire 60 may belong to the second layer L2. Also, a portion of the eighth turn of the second wire 60 may belong to the third layer L3.

[0045] The tenth turn of the second wire 60 has a portion that belongs to the second layer L2. Specifically, the tenth turn of the second wire 60 has a portion that is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the ninth and eleventh turns of the first wire 50. This portion is wound adjacent to the tenth turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. That is, the tenth turn of the second wire 60 has a portion that is wound on the second flange 31 side with respect to the first portion 71 in the direction along the central axis X. In other words, the second wire 60 has at least one turn that is wound on the second flange 31 side with respect to the first portion 71 in the direction along the central axis X.

[0046] The 11th turn to partway through the 15th turn of the second wire 60 belong to the second layer L2. The 11th turn to partway through the 15th turn of the second wire 60 are wound in order such that the increasing number of turns is closer to the second flange 31 in the direction along the central axis X. The 11th turn to partway through the 15th turn of the second wire 60 are wound adjacent to each other in the direction along the central axis X. The 11th turn of the second wire 60 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the 11th and 12th turns of the first wire 50. That is, the jth turn of the second wire 60 (where j is an integer between 11 and 15) is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the jth and (j+1)th turns of the first wire 50.

[0047] As described above, the 11th to 15th turns of the first wire 50 are wound in order such that the greater the number of turns, the closer the turn is to the second flange 31 in the direction along the central axis X. Therefore, the jth turn of the second wire 60, which is wound around the valley portion between the jth turn and the (j+1)th turn of the first wire 50, is located closer to the second flange 31 in the direction along the central axis X than the jth turn of the first wire 50. In other words, when comparing the same turns of the first wire 50 and the second wire 60, in the 11th to 15th turns, the first wire 50 is located closer to the first flange 21 in the direction along the central axis X than the same turn of the second wire 60. Note that "the first wire 50 is located on the first flange portion 21 side relative to the second wire 60" means that when each wire is viewed from the end as shown in Figure 2, the center of each turn of the second wire 60 is located on the second flange portion 31 side relative to the center of each turn of the first wire 50.

[0048] The remaining portion of the 15th turn of the second wire 60, specifically, the portion of the 15th turn including the portion wound on the upper surface side of the winding core 11, belongs to the first layer L1. That is, the 15th turn of the second wire 60 has a portion wound on the second layer L2 and a portion wound on the first layer L1. This portion of the 15th turn of the second wire 60 is wound adjacent to the 15th turn of the first wire 50 on the second flange 31 side in the direction along the central axis X.

[0049] The 16th turn of the second wire 60 has a portion wound around the winding core 11 and a portion connected to the fourth external electrode 44, away from the winding core 11. The portion of the 16th turn of the second wire 60 wound around the winding core 11 belongs to the first layer L1. This portion of the 16th turn of the second wire 60 is wound adjacent to the 16th turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. That is, from the 11th turn of the second wire 60 onwards, the first wire 50 is located closer to the first flange 21 than the same turn of the second wire 60 in the direction along the central axis X. Furthermore, when tracing the second wire 60 from the first end 61 to the second end 62, the second wire 60 is located closer to the second flange 31 in the direction along the central axis X as the number of turns increases. Note that, "the more the number of turns of the second wire 60 increases, the closer it is to the second flange portion 31 in the direction along the central axis X" means that when each wire is viewed from the end as in Figure 2, the center of each turn of the second wire 60 is located closer to the second flange portion 31 in the direction along the central axis X than the center of the previous turn.

[0050] <Regarding stray capacitance in the first embodiment> In the following, it is assumed that approximately the same positive voltage is applied to the first end 51 of the first wire 50 and the first end 61 of the second wire 60, and that a ground voltage as a reference voltage is applied to the second end 52 of the first wire 50 and the second end 62 of the second wire 60.

[0051] The greater the difference in the number of turns between the turns of the second wire 60 that contact each turn of the first wire 50, the greater the stray capacitance generated between adjacent turns of each wire. For example, as shown in FIG. 2, the turns of the second wire 60 that contact the first turn of the first wire 50 are the first and second turns. In this case, it can be said that there is no large potential difference between the first turn of the first wire 50 and the first turn of the second wire 60. However, when comparing the potential of the first turn of the first wire 50 with the potential of the second turn of the second wire 60, it can be said that the potential of the first turn of the first wire 50 is higher. Therefore, a stray capacitance corresponding to this potential difference is generated between the first turn of the first wire 50 and the first turn of the second wire 60.

[0052] Here, when comparing the contacting turns of the first wire 50 and the second wire 60, the stray capacitance generated when the potential of the first wire 50 is one turn higher than the potential of the second wire 60 is defined as a positive unit capacitance A. Specifically, the stray capacitance generated between the kth turn (k is a positive integer) of the first wire 50 and the (k+1)th turn of the second wire 60 in contact therewith is defined as one positive unit capacitance A. In this case, the stray capacitance generated between the kth turn of the first wire 50 and the (k+2)th turn of the second wire 60 in contact therewith is two positive unit capacitances A.

[0053] When the unit capacitance A is defined as above, when comparing the contacting turns of the first wire 50 and the second wire 60, the stray capacitance generated when the potential of the second wire 60 is one turn higher than the potential of the first wire 50 is a negative unit capacitance B. The negative unit capacitance B has the same absolute value as the positive unit capacitance A, but is opposite in sign. Specifically, the stray capacitance generated between the kth turn of the second wire 60 and the (k+1)th turn of the first wire 50 that contacts it is one negative unit capacitance B. Furthermore, the stray capacitance generated between the kth turn of the second wire 60 and the (k+2)th turn of the first wire 50 that contacts it is a negative unit capacitance B.

[0054] In the first embodiment, the coil device 10 has eight positive unit capacitances A and eight negative unit capacitances B. Therefore, when viewed as a whole, the positive stray capacitance and the negative stray capacitance are approximately the same value. In other words, the stray capacitance generated due to a high potential of the first wire 50 and the stray capacitance generated due to a high potential of the second wire 60 are approximately the same value.

[0055] <Effects of the First Embodiment> (1-1) In the first embodiment, the (m+2)th turn of the first wire 50 has a first portion 71 wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the mth turn and the (m+1)th turn of the first wire 50. That is, the (m+2)th turn of the first wire 50 is wound back relative to the (m+1)th turn. In this way, the second wire 60 is wound across the portion where the first wire 50 is wound back, and therefore the difference in the number of turns between the first wire 50 and the second wire 60 that contact each other before and after the portion is changed.

[0056] Specifically, in the first embodiment, the seventh turn of the second wire 60 has a portion that contacts the sixth and seventh turns of the first wire 50. Thus, in a location with a smaller number of turns than the first portion 71, the i-th turn of the second wire 60 has a portion that contacts the (i-1)th and (i+1)th turns of the first wire 50. Furthermore, the eleventh turn of the second wire 60 has a portion that contacts the eleventh and twelfth turns of the first wire 50. In a location with a larger number of turns than the first portion 71, the j-th turn of the second wire 60 has a portion that contacts the (j+1)th and (j+1)th turns of the first wire 50. In this way, the difference in the number of turns between the first wire 50 and the second wire 60 that contact each other before and after the first portion 71 is changed.

[0057] Furthermore, in the first embodiment, the first wire 50 has a first portion 71. This reduces the space required for winding the first wire 50 in the direction along the central axis X compared to a configuration in which the entire first wire 50 belongs to the first layer L1. Furthermore, in the first embodiment, the second wire 60 has a second portion 72. This reduces the space required for winding the second wire 60 in the direction along the central axis X compared to a configuration in which the entire second wire 60 belongs to both the first layer L1 and the second layer L2. Therefore, with the above configuration, it is possible to change the difference in the number of turns between the contacting first wire 50 and second wire 60 while reducing the space required for each wire in the direction along the central axis X.

[0058] (1-2) In the first embodiment, the m-th turn of the second wire 60 is located closer to the first flange 21 than the m-th turn of the first wire 50 in the direction along the central axis X. On the other hand, the n-th turn of the second wire 60 is located closer to the second flange 31 than the n-th turn of the first wire 50 in the direction along the central axis X. In other words, when comparing the front-to-back relationships of the same turns of each wire, the front-to-back relationships are reversed between the m-th turn and the n-th turn. With this configuration, the positive and negative stray capacitances of the second wire 60 before the m-th turn and after the n-th turn can be changed.

[0059] (1-3) In the first embodiment, when comparing the same turns of the first wire 50 and the second wire 60, in the second to (m-1)th turns, the second wire 60 is located closer to the first flange 21 than the same turn of the first wire 50 in the direction along the central axis X. When comparing the same turns of the first wire 50 and the second wire 60, in the (n+1)th and subsequent turns, the first wire 50 is located closer to the first flange 21 than the same turn of the second wire 60 in the direction along the central axis X. With this configuration, the positive and negative signs of the stray capacitances of the first wire 50 and the second wire 60 are reversed only in the portion from the mth turn to the nth turn. As a result, for the coil device 10 as a whole, at least a portion of the stray capacitance generated in turns less than the mth turn can be canceled out by the stray capacitance generated in turns greater than the nth turn.

[0060] (1-4) In the first embodiment, when tracing the second wire 60 from the first end 61 to the second end 62, the second wire 60 is positioned closer to the second flange 31 in the direction along the central axis X as the number of turns increases. In other words, the second wire 60 is wound from the second flange 31 side to the first flange 21 side in the direction along the central axis X without rewinding. Compared to a configuration in which the second wire 60 has rewinding, the above configuration stabilizes the winding state of the second wire 60.

[0061] (1-5) In the first embodiment, the stray capacitance generated due to the high potential of the first wire 50 is approximately the same as the stray capacitance generated due to the high potential of the second wire 60. Therefore, when viewed as a whole, the coil device 10 has an excellent balance of stray capacitances.

[0062] (Second embodiment) A coil component according to a second embodiment will be described below. In the coil component according to the second embodiment, the basic configurations of the drum core 10C, the planar core 10F, the first wire 50, the second wire 60, and the first to fourth external electrodes 41 to 44 are the same as those in the first embodiment. The following describes the winding manner of the first wire 50 and the second wire 60, which is different from that in the first embodiment.

[0063] <Regarding the Wire Winding Mode of the Second Embodiment> 3, the first to midway through the seventh turn of the first wire 50 have a portion that belongs to the first layer L1. The first to midway through the seventh turn of the first wire 50 are wound in order such that the greater the number of turns, the closer the turns are to the second flange 31 in the direction along the central axis X. The first to midway through the seventh turn of the first wire 50 are wound adjacent to each other in the direction along the central axis X.

[0064] The eighth turn of the first wire 50 has a first portion 71 that belongs to the second layer L2. Specifically, the first portion 71 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the sixth and seventh turns of the first wire 50. In this way, when n is 8 and m is 6 (n=m+2), the nth turn of the first wire 50 has the first portion 71 that is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the mth and (m+1)th turns of the first wire 50. Note that a part of the eighth turn of the first wire 50 may belong to the first layer L1.

[0065] The ninth turn of the first wire 50 has a portion that belongs to the first layer L1. This portion is wound adjacent to the seventh turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. Note that a part of the ninth turn of the first wire 50 may belong to the second layer L2.

[0066] The tenth turn of the first wire 50 has a third portion 73 that belongs to the second layer L2. Specifically, the third portion 73 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the seventh and ninth turns of the first wire 50. That is, the (m+4)th turn of the first wire 50 belongs to the second layer L2 and has the third portion 73 that is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the (m+1)th and (m+3)th turns of the first wire 50. Note that a portion of the tenth turn of the first wire 50 may belong to the first layer L1. The configuration of the eleventh and subsequent turns of the first wire 50 is the same as that of the first embodiment.

[0067] The first turn of the second wire 60 has a portion belonging to the first layer L1. This portion is wound adjacent to the first turn of the first wire 50 on the first flange 21 side in the direction along the central axis X.

[0068] The second turn to the middle of the sixth turn of the second wire 60 belongs to the second layer L2. Note that a part of the second turn of the second wire 60 may belong to the first layer L1. The second turn to the sixth turn of the second wire 60 are wound in order such that the increasing number of turns is closer to the second flange 31 in the direction along the central axis X. The second turn to the sixth turn of the second wire 60 are wound adjacent to each other in the direction along the central axis X. The second turn of the second wire 60 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the first and second turns of the first wire 50. That is, the i-th turn (where i is an integer between 2 and 6) of the second wire 60 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the (i-1)-th turn of the first wire 50 and the i-th turn. Furthermore, the sixth turn of the second wire 60 has a portion wound adjacent to the eighth turn of the first wire 50 on the first flange 21 side. That is, the sixth turn of the second wire 60 has a portion wound on the first flange 21 side with respect to the first portion 71 in the direction along the central axis X. In other words, the second wire 60 has at least one turn wound on the first flange 21 side with respect to the first portion 71 in the direction along the central axis X.

[0069] As described above, the first wire 50 is wound in order from the first turn to the middle of the seventh turn such that the increasing number of turns leads to a position closer to the second flange 31 in the direction along the central axis X. Therefore, the i-th turn of the second wire 60, which is wound around the valley portion between the (i-1)th turn and the i-th turn of the first wire 50, is located closer to the first flange 21 in the direction along the central axis X than the i-th turn of the first wire 50. In other words, when comparing the same turns of the first wire 50 and the second wire 60, in the second to sixth turns, the second wire 60 is located closer to the first flange 21 in the direction along the central axis X than the same turn of the first wire 50. Note that the phrase "the second wire 60 is located closer to the first flange 21 in the direction along the central axis X than the first wire 50" is defined in the same way as in the first embodiment.

[0070] The seventh turn of the second wire 60 has a second portion 72 that belongs to the third layer L3. Specifically, the second portion 72 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the fifth and sixth turns of the second wire 60. In this manner, when a is 7, the a-th turn of the second wire 60 has the second portion 72 that belongs to the third layer L3. Note that a portion of the seventh turn of the second wire 60 may belong to the second layer L2. Also, a portion of the sixth turn of the second wire 60 may belong to the third layer L3.

[0071] The eighth turn of the second wire 60 has a fourth portion 74 belonging to the third layer L3. Specifically, the fourth portion 74 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the sixth turn of the second wire 60 and the eighth turn of the first wire 50. In the second embodiment, the entire eighth turn of the second wire 60 forms the fourth portion 74. That is, the (m+2)th turn of the second wire 60 belongs to the third layer L3 and has the fourth portion 74 wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the mth turn of the second wire 60 and the (m+2)th turn of the first wire 50.

[0072] The ninth turn of the second wire 60 has a fifth portion 75 that belongs to the third layer L3. Specifically, the fifth portion 75 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the eighth and tenth turns of the first wire 50. That is, the (m+3)th turn of the second wire 60 belongs to the third layer L3 and has a fifth portion 75 that is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the (m+2)th and (m+4)th turns of the first wire 50. Note that a portion of the ninth turn of the second wire 60 may belong to the second layer L2.

[0073] The tenth turn of the second wire 60 is wound adjacent to the third portion 73 on the second flange 31 side in the direction along the central axis X. That is, the tenth turn of the second wire 60 has a portion wound on the second flange 31 side with respect to the first portion 71 in the direction along the central axis X. In other words, the second wire 60 has at least one turn wound on the second flange 31 side with respect to the first portion 71 in the direction along the central axis X. The configuration of the second wire 60 from the tenth turn onwards is the same as that of the first embodiment.

[0074] <Effects of the second embodiment> In the second embodiment, in addition to the effects (1-1) and (1-5) of the first embodiment, the following effects can be further obtained.

[0075] (2-1) In the second embodiment, the first wire 50 rides onto the second layer L2 at two locations, the first portion 71 and the third portion 73. With this configuration, the space required for winding the first wire 50 in the direction along the central axis X is even smaller than in a configuration in which the entire first wire 50 belongs to the first layer L1. Furthermore, with the above configuration, the second wire 60 rides onto the third layer L3 at three locations, the second portion 72, the fourth portion 74, and the fifth portion 75. As a result, the space required for winding the second wire 60 in the direction along the central axis X is even smaller than in a configuration in which the entire second wire 60 belongs to the first layer L1 and the second layer L2.

[0076] (2-2) In the second embodiment, the m-th turn of the second wire 60 is located closer to the first flange 21 than the m-th turn of the first wire 50 in the direction along the central axis X. Furthermore, the (m+4)-th turn of the second wire 60 is located closer to the second flange 31 than the (m+4)-th turn of the first wire 50 in the direction along the central axis X. In other words, when comparing the front-to-back relationships of the same turns of each wire, the front-to-back relationships are reversed between the n-th turn and the (m+4)-th turn. With this configuration, the positive and negative stray capacitances of the second wire 60 before the m-th turn and after the (m+4)-th turn can be changed.

[0077] <Example of change> The first and second embodiments can be modified as follows: The first and second embodiments and the following modifications can be combined and implemented within the scope of technical compatibility.

[0078] In the first and second embodiments, the configuration of the coil device 10 is not limited to the above configuration. For example, the coil device 10 does not need to include the planar core 10F. Furthermore, the shape of the planar core 10F is not limited to a rectangular plate. For example, the planar core 10F may be an elliptical plate.

[0079] In the first and second embodiments, the shape of the winding core 11 is not limited to the examples in the above embodiments. For example, the shape of the winding core 11 may be cylindrical or may be a polygonal prism other than a quadrangular prism.

[0080] In the first and second embodiments, the materials of the drum core 10C and the planar core 10F are not limited to those of the above embodiments. For example, the materials of the drum core 10C and the planar core 10F are not limited to Ni-Zn ferrite, but may be Mn-Zn ferrite, etc. Also, the materials of the drum core 10C and the planar core 10F may be ferrite, alumina, synthetic resin, or a mixture thereof.

[0081] In the first and second embodiments, the configuration of the drum core 10C is not limited to the examples of the above embodiments. For example, the first flange portion 21 may not have the recessed portion 23. In this case, it is sufficient that the first external electrode 41 and the second external electrode 42 are spaced apart from each other. The same applies to the second flange portion 31.

[0082] In the first and second embodiments, the material and shape of the first to fourth external electrodes 41 to 44 are not limited to the examples in each embodiment. For example, the plating layer of the first to fourth external electrodes 41 to 44 may be a single conductive layer. Alternatively, the first to fourth external electrodes 41 to 44 may not have a plating layer, and a conductive metal layer may be exposed. Alternatively, the first to fourth external electrodes 41 to 44 may be formed from a plate-shaped metal material.

[0083] In the first and second embodiments, the cross-sectional shapes of the first wire 50 and the second wire 60 are not limited to those in the above embodiments. For example, the cross-sectional shapes of the first wire 50 and the second wire 60 may be elliptical, rectangular, or the like.

[0084] In the first and second embodiments, the total number of turns of the first wire 50 is not limited to the examples in the above embodiments. The same applies to the total number of turns of the second wire 60. Furthermore, the total number of turns of the first wire 50 and the total number of turns of the second wire 60 may be different.

[0085] In the first and second embodiments, the length of the portion of the nth turn of the first wire 50 wound from the outside in a direction perpendicular to the central axis X with respect to the valley portion between the mth turn and the (m+1)th turn of the first wire 50, i.e., the first portion 71, is not important. However, it is desirable that the length of the first portion 71 is sufficiently ensured, and the first portion 71 is preferably wound 0.5 turns or more with respect to the valley portion between the mth turn and the (m+1)th turn of the first wire 50. The same applies to the second portion 72 to the fifth portion 75.

[0086] In the first and second embodiments, the numbers m and n are not limited to those in the above embodiments, provided that m is a positive integer and n is an integer equal to or greater than m+2. Also, the number a is not limited to those in the above embodiments, provided that a is an integer equal to or greater than 2.

[0087] In the first and second embodiments, as long as the mth and (m+1)th turns of the first wire 50 belong to the first layer L1, the number of turns and the number of turns are not limited. Furthermore, as long as the nth turn of the first wire 50 has a first portion 71 wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the mth and (m+1)th turns of the first wire 50, the number of turns and the number of turns are not limited. Furthermore, as long as the ath turn of the second wire 60 has a second portion 72 that belongs to the third layer L3, the number of turns and the number of turns are not limited. In other words, as long as the portion of the second wire 60 wound around the third layer L3 is at least one turn, the number of turns and the number of turns are not limited.

[0088] In the first and second embodiments, as long as the second wire 60 has at least one turn wound on the first flange 21 side of the first portion 71 in the direction along the central axis X, the number of turns of the second wire 60 wound on the first flange 21 side of the first portion 71 in the direction along the central axis X is not limited to the examples of the above embodiments. Furthermore, as long as the second wire 60 has at least one turn wound adjacent to the first portion 71 on the second flange 31 side in the direction along the central axis X, the number of turns of the second wire 60 wound on the second flange 31 side of the first portion 71 in the direction along the central axis X is not limited to the examples of the above embodiments.

[0089] In the first and second embodiments, in the second turn to the (m-1)th turn, the second wire 60 may be located closer to the first flange 21 in the direction along the central axis X with respect to the same turn of the first wire 50. Also, in the (n+1)th and subsequent turns, the first wire 50 may be located closer to the first flange 21 in the direction along the central axis X with respect to the same turn of the second wire 60.

[0090] In the first embodiment, when tracing the second wire 60 from the first end 61 to the second end 62, all of the turns of the second wire 60 do not necessarily have to be located closer to the second flange 31 in the direction along the central axis X as the number of turns increases. It is sufficient that at least the portion of the second wire 60 that continuously belongs to the second layer L2 is located closer to the second flange 31 in the direction along the central axis X as the number of turns increases. However, this is not a limitation, and in the first embodiment, the second wire 60 does not necessarily have to be located closer to the second flange 31 in the direction along the central axis X as the number of turns increases.

[0091] In the first embodiment, the m-th turn of the second wire 60 may be located closer to the first flange 21 than the m-th turn of the first wire 50 in the direction along the central axis X, and the n-th turn of the second wire 60 may be located closer to the first flange 21 than the n-th turn of the first wire 50 in the direction along the central axis X. For example, in the first embodiment, the 10-th turn of the second wire 60 may be wound in a valley portion between the 9-th turn of the second wire 60 and the 10-th turn of the second wire 60. Furthermore, the m-th turn of the second wire 60 may be located closer to the second flange 31 than the m-th turn of the first wire 50 in the direction along the central axis X, and the n-th turn of the second wire 60 may be located closer to the second flange 31 than the n-th turn of the first wire 50 in the direction along the central axis X.

[0092] In the second embodiment, the m-th turn of the second wire 60 may be located closer to the first flange 21 than the m-th turn of the first wire 50 in the direction along the central axis X, and the (m+4)-th turn of the second wire 60 may be located closer to the first flange 21 than the (m+4)-th turn of the first wire 50 in the direction along the central axis X. Furthermore, the m-th turn of the second wire 60 may be located closer to the second flange 31 than the m-th turn of the first wire 50 in the direction along the central axis X, and the (m+4)-th turn of the second wire 60 may be located closer to the second flange 31 than the (m+4)-th turn of the first wire 50 in the direction along the central axis X.

[0093] In the first embodiment, the second portion 72 is not limited to the ninth turn of the second wire 60. In the example shown in FIG. 4 , the first turn to the middle of the eleventh turn of the first wire 50 belong to the first layer L1. Furthermore, the first turn to the eleventh turn of the first wire 50 are wound in order such that the greater the number of turns, the closer to the second flange 31 in the direction along the central axis X they are. Furthermore, the first turn to the eleventh turn of the first wire 50 are wound adjacent to each other in the direction along the central axis X.

[0094] In this example, the twelfth turn of the first wire 50 has a first portion 71 that belongs to the second layer L2. Specifically, the first portion 71 has the first portion 71 wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the tenth and eleventh turns of the first wire 50. In this way, when n is 12 and m is 10 (n = m + 2), the nth turn of the first wire 50 has the first portion 71 wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the mth and (m + 1)th turns of the first wire 50. Note that a portion of the twelfth turn of the first wire 50 may belong to the first layer L1. Also, a portion of the eleventh turn of the first wire 50 may belong to the second layer L2.

[0095] In this example, the 13th turn of the first wire 50 has a portion that belongs to the first layer L1. This portion is wound adjacent to the 11th turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. Note that a portion of the 13th turn of the first wire 50 may belong to the second layer L2.

[0096] The 14th to 17th turns of the first wire 50 comprise a portion belonging to the first layer L1. This portion is wound adjacent to the 13th turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. The 14th to 17th turns of the first wire 50 are wound in order such that the greater the number of turns, the closer the turn is to the second flange 31 in the direction along the central axis X. The 14th to 17th turns of the first wire 50 are wound adjacent to each other in the direction along the central axis X. Although not shown, the first wire 50 has an 18th turn, and is assumed to be pulled out from the winding core 11 midway through the 18th turn and connected to the third external electrode 43. Note that FIG. 4 does not show the wires on the underside of the winding core 11.

[0097] In this example, the first turn of the second wire 60 has a portion that belongs to the first layer L1. This portion is wound adjacent to and closer to the first flange 21 than the first turn of the first wire 50 in the direction along the central axis X. Note that a portion of the second turn of the first wire 50 may also belong to the first layer L1.

[0098] The second turn to the tenth turn of the second wire 60 belong to the second layer L2. The second turn to the tenth turn of the second wire 60 are wound in order such that the greater the number of turns, the closer to the second flange 31 in the direction along the central axis X. The second turn to the tenth turn of the second wire 60 are wound adjacent to each other in the direction along the central axis X.

[0099] The 11th turn of the second wire 60 has a portion belonging to the second layer L2. Specifically, this portion is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the 11th and 13th turns of the first wire 50. This portion is wound adjacent to the 12th turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. This portion is located closer to the second flange 31 than the 11th turn of the first wire 50 in the direction along the central axis X. Note that the 10th to 11th turns of the second wire 60 may temporarily ride over the 12th turn of the first wire 50 and belong to the third layer L3. Because this portion temporarily rides over the third layer L3 over a very small section, in the present disclosure, the 10th to 11th turns of the second wire 60 may be treated as belonging to the second layer L2.

[0100] The twelfth turn of the second wire 60 has a second portion 72 that belongs to the third layer L3. Specifically, the second portion 72 has the second portion 72 wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the twelfth turn of the first wire 50 and the eleventh turn of the second wire 60. That is, when a is 12, the a-th turn of the second wire 60 has the second portion 72 that belongs to the third layer L3. Furthermore, a part of the twelfth turn of the second wire 60 may have a portion that is wound from the outside with respect to a portion of the tenth or eleventh turn of the second wire 60 that belongs to the third layer L3, and is positioned outside the third layer L3.

[0101] The thirteenth to sixteenth turns of the second wire 60 belong to the second layer L2. The thirteenth to sixteenth turns of the second wire 60 are wound in order such that the greater the number of turns, the closer the turns are to the second flange 31 in the direction along the central axis X. The thirteenth to sixteenth turns of the second wire 60 are wound adjacent to each other in the direction along the central axis X.

[0102] The 17th turn of the second wire 60 is wound in the same manner as the 15th turn of the second wire 60 in the first embodiment. Although not shown, the second wire 60 has an 18th turn, and is pulled out from the winding core 11 midway through the 18th turn and connected to the fourth external electrode 44.

[0103] 4, the second portion 72 of the second wire 60 is wound outwardly of the first portion 71 of the first wire 50. The second portion 72 and the first portion 71 are in the same turn. Therefore, stray capacitance occurring between the first wire 50 and the second wire 60 in these turns can be suppressed.

[0104] 4, the second wire 60 is wound 9 turns, which is smaller than the m-th turn, toward the first flange 21 side in the direction along the central axis X than the m-th turn. On the other hand, the second wire 60 is wound 5 turns, which is larger than the n-th turn, toward the second flange 31 side in the direction along the central axis X than the n-th turn. In this way, since the number of turns wound toward the first flange 21 side and the number of turns wound toward the second flange 31 side starting from the vicinity of the second portion 72 are different, the orientation of the coil device 10 can be easily identified by visually checking these winding patterns.

[0105] In the first embodiment, the second portion 72 of the second wire 60 is not limited to being wound from the outside around the first portion 71 in a direction perpendicular to the central axis X. In the example shown in Fig. 5, the first wire 50 is wound in the same manner as in the first embodiment. That is, when n is 10 and m is 8 (n = m + 2), the nth turn of the first wire 50 has the first portion 71 belonging to the second layer L2. The first portion 71 is wound from the outside around a valley portion between the mth turn and the (m + 1)th turn of the first wire 50 in a direction perpendicular to the central axis X.

[0106] The first to eighth turns of the second wire 60 are wound in the same manner as in the first embodiment. In the example shown in FIG. 5, the ninth turn of the second wire 60 has the second portion 72 belonging to the third layer L3. That is, when a is 9, the a-th turn of the second wire 60 has the second portion 72 belonging to the third layer L3. The tenth and subsequent turns of the second wire 60 are wound in the same manner as in the first embodiment. Note that FIG. 5 does not show the wires on the underside of the winding core 11.

[0107] As in the first embodiment, when comparing the contacting turns of the first wire 50 and the second wire 60, the stray capacitance generated when the potential of the first wire 50 is one turn higher than the potential of the second wire 60 is defined as a positive unit capacitance A. Furthermore, when comparing the contacting turns of the first wire 50 and the second wire 60, the stray capacitance generated when the potential of the second wire 60 is one turn higher than the potential of the first wire 50 is defined as a negative unit capacitance B.

[0108] 5, the coil device 10 has eight positive unit capacitances A and seven negative unit capacitances B. Therefore, when viewed as a whole, the positive stray capacitance is larger than the negative stray capacitance by one unit capacitance A. In this way, it is possible to design a coil device 10 in which the stray capacitance generated by a high potential of the first wire 50 is larger than the stray capacitance generated by a high potential of the second wire 60.

[0109] Furthermore, the second portion 72 of the second wire 60 is not limited to being wound from the outside around the first portion 71 in a direction perpendicular to the central axis X, and may be wound in a winding manner as shown in the example of FIG. 6. In the example shown in FIG. 6, the first to middle of the eighth turns of the first wire 50 belong to the first layer L1. The first to eighth turns of the first wire 50 are wound in order such that the increasing number of turns is closer to the second flange 31 in the direction along the central axis X. The first to eighth turns of the first wire 50 are wound adjacent to each other in the direction along the central axis X.

[0110] In this example, the ninth turn of the first wire 50 has a first portion 71 that belongs to the second layer L2. Specifically, the first portion 71 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the seventh and eighth turns of the first wire 50. In this manner, when n is 9 and m is 7 (n=m+2), the nth turn of the first wire 50 has the first portion 71 that is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the mth and (m+1)th turns of the first wire 50. Note that a portion of the ninth turn of the first wire 50 may belong to the first layer L1. Also, a portion of the eighth turn of the first wire 50 may belong to the second layer L2.

[0111] In this example, the tenth turn of the first wire 50 belongs to the first layer L1. The tenth turn of the first wire 50 has a portion wound adjacent to the eighth turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. Note that a portion of the tenth turn of the first wire 50 may belong to the second layer L2. Furthermore, the eleventh and subsequent turns of the first wire 50 are wound in the same manner as in the first embodiment.

[0112] In this example, the first to sixth turns of the second wire 60 are wound in the same manner as in the first embodiment. The seventh turn of the second wire 60 belongs to the second layer L2. The seventh turn of the second wire 60 has a portion wound adjacent to the ninth turn of the first wire 50 on the first flange 21 side in the direction along the central axis X. Note that a portion of the seventh turn of the second wire 60 may belong to the third layer L3.

[0113] The eighth turn of the second wire 60 has the second portion 72 that belongs to the third layer L3. That is, when a is 8, the a-th turn of the second wire 60 has the second portion 72 that belongs to the third layer L3.

[0114] The ninth turn of the second wire 60 has a portion that belongs to the second layer L2. Specifically, this portion is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the eighth and tenth turns of the first wire 50. This portion is also wound adjacent to the ninth turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. Note that a part of the ninth turn of the second wire 60 may belong to the third layer L3.

[0115] The tenth turn of the second wire 60 belongs to the second layer L2. Specifically, the tenth turn of the second wire 60 has a portion wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the tenth and eleventh turns of the first wire 50. This portion is wound adjacent to the ninth turn of the second wire 60 on the second flange portion 31 side in the direction along the central axis X. The eleventh and subsequent turns of the second wire 60 are wound in the same manner as in the first embodiment. Note that in FIG. 6, the wires on the underside of the winding core 11 are not shown.

[0116] As in the first embodiment, when comparing the contacting turns of the first wire 50 and the second wire 60, the stray capacitance generated when the potential of the first wire 50 is one turn higher than the potential of the second wire 60 is defined as a positive unit capacitance A. Furthermore, when comparing the contacting turns of the first wire 50 and the second wire 60, the stray capacitance generated when the potential of the second wire 60 is one turn higher than the potential of the first wire 50 is defined as a negative unit capacitance B.

[0117] 6, the coil device 10 has seven positive unit capacitances A and eight negative unit capacitances B. Therefore, when viewed as a whole, the negative stray capacitance is larger than the positive stray capacitance by one unit capacitance B. In this way, it is possible to design a coil device 10 in which the stray capacitance generated by a high potential of the second wire 60 is larger than the stray capacitance generated by a high potential of the first wire 50.

[0118] In the second embodiment, the first portion 71 is not limited to the (m+2)th turn of the first wire 50. For example, in the example shown in FIG. 7 , the first turn to partway through the eighth turn of the first wire 50 belong to the first layer L1. The first turn to partway through the eighth turn of the first wire 50 are wound in order such that the greater the number of turns, the closer the turns are to the second flange 31 in the direction along the central axis X. The first turn to partway through the eighth turn of the first wire 50 are wound adjacent to each other in the direction along the central axis X. Note that a portion of the eighth turn of the first wire 50 may belong to the second layer L2.

[0119] In this example, the ninth turn of the first wire 50 has a first portion 71 belonging to the second layer L2. Specifically, the first portion 71 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the sixth and seventh turns of the first wire 50. In this way, when n is 9 and m is 6 (n=m+3), the nth turn of the first wire 50 has the first portion 71 wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the mth and (m+1)th turns of the first wire 50.

[0120] The tenth turn of the first wire 50 has a third portion 73 that belongs to the second layer L2. Specifically, the third portion 73 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the seventh and eighth turns of the first wire 50. That is, the (m+4)th turn of the first wire 50 belongs to the second layer L2 and has the third portion 73 that is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the (m+1)th and (m+2)th turns of the first wire 50. The eleventh and subsequent turns of the first wire 50 are the same as those in the second embodiment.

[0121] The first to seventh turns of the second wire 60 are the same as those in the second embodiment. The eighth turn of the second wire 60 has a fourth portion 74 that belongs to the third layer L3. Specifically, the fourth portion 74 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the sixth turn of the second wire 60 and the ninth turn of the first wire 50. In the second embodiment, the entire eighth turn of the second wire 60 forms the fourth portion 74. That is, the (m+2)th turn of the second wire 60 belongs to the third layer L3 and has the fourth portion 74 that is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the mth turn of the second wire 60 and the (m+3)th turn of the first wire 50.

[0122] The ninth turn of the second wire 60 has a fifth portion 75 that belongs to the third layer L3. Specifically, the fifth portion 75 is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the ninth and tenth turns of the first wire 50. That is, the (m+3)th turn of the second wire 60 belongs to the third layer L3 and has the fifth portion 75 that is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the (m+3)th and (m+4)th turns of the first wire 50.

[0123] The tenth turn of the second wire 60 belongs to the second layer L2. Specifically, the tenth turn of the second wire 60 has a portion wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the eighth and eleventh turns of the first wire 50. This portion is wound adjacent to the tenth turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. Note that a portion of the tenth turn of the second wire 60 may belong to the third layer L3. The eleventh turn and subsequent turns of the second wire 60 are the same as those in the second embodiment. In addition, in FIG. 7, the wires on the underside of the winding core 11 are not shown.

[0124] In the example shown in FIG. 7 , the m-th turn to the (m+2)-th turn of the first wire 50 are continuously wound in the first layer L1. The (m+3)-th turn of the first wire 50 is located closer to the first flange 21 than the (m+2)-th turn in the direction along the central axis X. That is, the first wire 50 is wound back toward the first flange 21 from the (m+2)-th turn to the (m+3)-th turn. With this configuration, the m-th and (m+1)-th turns of the first wire 50 are pressed toward the first flange 21 in the direction along the central axis X by the rewinding of the (m+2)-th turn to the (m+3)-th turn. In other words, from the m-th turn to the (m+2)-th turn of the first wire 50, adjacent turns are wound closely together. This configuration can prevent the fourth portion 74 and the fifth portion 75 of the second wire 60 from dropping and moving to the first layer L1.

[0125] <Additional Notes> The technical ideas that can be understood from the above-described embodiment and modified examples will be described. [1] A winding core, a first flange provided at a first end of the winding core in a direction along the central axis, a second flange provided at a second end of the winding core opposite to the first end, first and second external electrodes provided at the first flange, third and fourth external electrodes provided at the second flange, a first wire wound around the winding core, the first end connected to the first external electrode and the second end connected to the third external electrode, and a second wire wound around the winding core in the same direction as the first wire, the first end connected to the second external electrode and the second end connected to the fourth external electrode, wherein the number of turns of the first wire and the second wire increases by one for each full turn around the central axis from the first end toward the second end, and a portion directly wound around the winding core is a first layer, and a portion wound around the winding core from the outside of the first layer in a direction perpendicular to the central axis is a second layer. a coil component in which, when a portion wound around the mth turn of the first wire is defined as a second layer and a portion wound around the second layer from the outside in a direction perpendicular to the central axis is defined as a third layer, the mth turn (where m is a positive integer) and the (m+1)th turn of the first wire have a portion belonging to the first layer, the nth turn (where n is an integer of m+2 or greater) of the first wire belong to the second layer and have a first portion wound around a valley portion between the mth turn of the first wire and the (m+1)th turn from the outside in a direction perpendicular to the central axis, the second wire has at least one turn wound around the first flange side of the first portion in the direction along the central axis and at least one turn wound around the second flange side of the first portion in the direction along the central axis, and the ath turn (where a is an integer of 2 or greater) of the second wire has a second portion belonging to the third layer.

[0126] [2] The coil component described in [1], wherein the m-th turn of the second wire is located closer to the first flange portion than the m-th turn of the first wire in the direction along the central axis, and the n-th turn of the second wire is located closer to the second flange portion than the n-th turn of the first wire in the direction along the central axis.

[0127] [3] A coil component according to [1] or [2], wherein, when comparing the same turns of the first wire and the second wire, in the second turn to the (m-1)th turn, the second wire is located closer to the first flange portion than the same turn of the first wire in the direction along the central axis, and in the (n+1)th turn and onwards, the first wire is located closer to the first flange portion than the same turn of the second wire in the direction along the central axis.

[0128] [4] The coil component according to any one of [1] to [3], wherein n=m+2, and when the second wire is traced from the first end to the second end, the portion of the second wire that continuously belongs to the second layer is located closer to the second flange portion in the direction along the central axis as the number of turns increases, the m-th turn of the second wire belongs to the second layer and has a portion that is wound adjacent to the (m+2)-th turn of the first wire on the first flange portion side in the direction along the central axis, and the (m+1)-th turn of the second wire has the second portion that is wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the m-th turn of the second wire and the (m+2)-th turn of the first wire.

[0129] [5] A coil component according to any one of [1] to [3], wherein n=m+2, the (m+1)-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the (m+2)-th turn of the first wire on the second flange side in the direction along the central axis, and the (m+2)-th turn of the second wire has the second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m+2)-th turn of the first wire and the (m+1)-th turn of the second wire.

[0130] [6] The coil component according to any one of [1] to [3], wherein n=m+2, the m-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the (m+2)-th turn of the first wire on the first flange side in the direction along the central axis, the (m-1)-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the m-th turn of the second wire on the first flange side in the direction along the central axis, and the (m+1)-th turn of the second wire is located closer to the first flange side than the (m+1)-th turn of the first wire in the direction along the central axis, and has the second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m-1)-th turn of the second wire and the m-th turn of the second wire.

[0131] [7] n=m+2, the (m+3)-th turn of the first wire belongs to the first layer and has a portion wound adjacent to the (m+1)-th turn of the first wire on the second flange side in the direction along the central axis, the (m+4)-th turn of the first wire belongs to the second layer and has a third portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m+1)-th turn of the first wire and the (m+3)-th turn of the first wire, the m-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the (m+2)-th turn of the first wire on the first flange side in the direction along the central axis, the (m-1)-th turn of the second wire belongs to the second layer and has a third portion wound adjacent to the m-th turn of the second wire on the first flange side in the direction along the central axis. the (m+1)-th turn of the second wire has the second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m-1)-th turn of the second wire and the m-th turn of the second wire; the (m+2)-th turn of the second wire has a fourth portion belonging to the third layer and wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the m-th turn of the second wire and the (m+2)-th turn of the first wire; and the (m+3)-th turn of the second wire has a fifth portion belonging to the third layer and wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m+2)-th turn of the first wire and the (m+4)-th turn of the first wire.

[0132] [8] n=m+3, the (m+2)-th turn of the first wire belongs to the first layer and has a portion wound adjacent to the (m+1)-th turn of the first wire on the second flange side in the direction along the central axis, the (m+4)-th turn of the first wire belongs to the second layer and has a third portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m+1)-th turn of the first wire and the (m+2)-th turn of the first wire, the m-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the (m+3)-th turn of the first wire on the first flange side in the direction along the central axis, and the (m-1)-th turn of the second wire belongs to the second layer and has a third portion wound adjacent to the m-th turn of the second wire on the first flange side in the direction along the central axis. the (m+1)-th turn of the second wire has the second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m-1)-th turn of the second wire and the m-th turn of the second wire; the (m+2)-th turn of the second wire belongs to the third layer and has a fourth portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the m-th turn of the second wire and the (m+3)-th turn of the first wire; and the (m+3)-th turn of the second wire belongs to the third layer and has a fifth portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m+3)-th turn of the first wire and the (m+4)-th turn of the first wire.

[0133] [9] A coil component according to [7] or [8], wherein the m-th turn of the second wire is located closer to the first flange portion than the m-th turn of the first wire in the direction along the central axis, and the (m+4)-th turn of the second wire is located closer to the second flange portion than the (m+4)-th turn of the first wire in the direction along the central axis. [Explanation of symbols]

[0134] L1…1st layer L2…Second layer L3…Third layer X…center axis 10...Coil parts 11...Core 21...First flange 31...Second flange 41...First external electrode 42…Second external electrode 43...Third external electrode 44...Fourth external electrode 50...First wire 60...Second wire 71…Part 1 72…Second part 73...Third part 74…4th part 75...5th part

Claims

1. A winding core portion; a first flange portion provided at a first end of the winding core portion in a direction along the central axis; a second flange portion provided at a second end of the winding core portion opposite to the first end; a first external electrode and a second external electrode provided on the first flange portion; a third external electrode and a fourth external electrode provided on the second flange portion; a first wire wound around the winding core, the first end of the first wire being connected to the first external electrode and the second end of the first wire being connected to the third external electrode; a second wire wound around the winding core in the same direction as the first wire, the first end of the second wire being connected to the second external electrode and the second end of the second wire being connected to the fourth external electrode; Equipped with With respect to the first wire and the second wire, the number of turns increases by one for each full turn around the central axis from the first end toward the second end, a portion that is directly wound around the winding core is defined as a first layer; a second layer is a portion wound from the outside of the first layer in a direction perpendicular to the central axis, When a portion wound from the outside of the second layer in a direction perpendicular to the central axis is defined as a third layer, the m-th turn (where m is a positive integer) and the (m+1)-th turn of the first wire have portions that belong to the first layer; the n-th turn (where n is an integer equal to or greater than m+2) of the first wire belongs to the second layer and has a first portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the m-th turn and the (m+1)-th turn of the first wire; the second wire has at least one turn wound on the first flange side of the first portion in the direction along the central axis, and at least one turn wound on the second flange side of the first portion in the direction along the central axis, The a-th turn (where a is an integer of 2 or more) of the second wire has a second portion that belongs to the third layer. Coil parts.

2. the m-th turn of the second wire is located closer to the first flange portion than the m-th turn of the first wire in the direction along the central axis, The n-th turn of the second wire is located closer to the second flange portion than the n-th turn of the first wire in the direction along the central axis. The coil component according to claim 1 .

3. When comparing the same turn of the first wire and the same turn of the second wire, in the second turn to the (m-1)th turn, the second wire is located closer to the first flange portion than the same turn of the first wire in the direction along the central axis, In the (n+1)th and subsequent turns, the first wire is located closer to the first flange portion than the same turn of the second wire in the direction along the central axis. The coil component according to claim 1 .

4. n=m+2, when tracing the second wire from the first end to the second end, a portion of the second wire continuously belonging to the second layer is located closer to the second flange portion in a direction along the central axis as the number of turns increases, the m-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the (m+2)-th turn of the first wire on the first flange side in the direction along the central axis, The (m+1)-th turn of the second wire has the second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the m-th turn of the second wire and the (m+2)-th turn of the first wire. The coil component according to claim 1 .

5. n=m+2, the (m+1)-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the (m+2)-th turn of the first wire on the second flange side in the direction along the central axis, The (m+2)-th turn of the second wire has the second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m+2)-th turn of the first wire and the (m+1)-th turn of the second wire. The coil component according to claim 1 .

6. n=m+2, the m-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the (m+2)-th turn of the first wire on the first flange side in the direction along the central axis, the (m-1)-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the m-th turn of the second wire on the first flange side in the direction along the central axis, The (m+1)-th turn of the second wire is located closer to the first flange portion than the (m+1)-th turn of the first wire in the direction along the central axis, and has the second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m-1)-th turn of the second wire and the m-th turn of the second wire. The coil component according to claim 1 .

7. n=m+2, the (m+3)-th turn of the first wire belongs to the first layer and has a portion wound adjacent to the (m+1)-th turn of the first wire on the second flange side in the direction along the central axis, the (m+4)-th turn of the first wire belongs to the second layer and has a third portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m+1)-th turn of the first wire and the (m+3)-th turn of the first wire; the m-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the (m+2)-th turn of the first wire on the first flange side in the direction along the central axis, the (m-1)-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the m-th turn of the second wire on the first flange side in the direction along the central axis, the (m+1)-th turn of the second wire has the second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m-1)-th turn of the second wire and the m-th turn of the second wire; the (m+2)-th turn of the second wire belongs to the third layer and has a fourth portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the m-th turn of the second wire and the (m+2)-th turn of the first wire; The (m+3)-th turn of the second wire belongs to the third layer and has a fifth portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m+2)-th turn of the first wire and the (m+4)-th turn of the first wire. The coil component according to claim 1 .

8. n=m+3, the (m+2)-th turn of the first wire belongs to the first layer and has a portion wound adjacent to the (m+1)-th turn of the first wire on the second flange side in the direction along the central axis, the (m+4)-th turn of the first wire belongs to the second layer and has a third portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m+1)-th turn of the first wire and the (m+2)-th turn of the first wire; the m-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the (m+3)-th turn of the first wire on the first flange side in the direction along the central axis, the (m-1)-th turn of the second wire belongs to the second layer and has a portion wound adjacent to the m-th turn of the second wire on the first flange side in the direction along the central axis, the (m+1)-th turn of the second wire has the second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m-1)-th turn of the second wire and the m-th turn of the second wire; the (m+2)-th turn of the second wire belongs to the third layer and has a fourth portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the m-th turn of the second wire and the (m+3)-th turn of the first wire; The (m+3)-th turn of the second wire belongs to the third layer and has a fifth portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the (m+3)-th turn of the first wire and the (m+4)-th turn of the first wire. The coil component according to claim 1 .

9. the m-th turn of the second wire is located closer to the first flange portion than the m-th turn of the first wire in the direction along the central axis, The (m+4)-th turn of the second wire is located closer to the second flange portion than the (m+4)-th turn of the first wire in the direction along the central axis. The coil component according to claim 7 or 8.

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