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-1)-th turn of a second wire 60 belongs to a first layer L1, and has a first portion 71 wound around an m-th turn of a first wire 50 adjacent to a second flange 31 side in a direction along a central axis X. The m-th turn of the second wire 60 belongs to a second layer L2, and has a portion wound around a valley portion between the m-th turn of the first wire 50 and the first portion 71 from outside in a direction orthogonal to the central axis X. The (m+1)-th turn of the second wire 60 belongs to the second layer L2, and has a portion wound around a valley portion between the first portion 71 and the (m+1)-th turn of the first wire 50 from outside in a direction orthogonal to the central axis X.SELECTED DRAWING: Figure 3

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] International Publication No. 2017 / 061143 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 problems, the present invention provides a winding core, a first flange provided at a first end of the winding core in a direction along a 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, 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 wound directly around the winding core is defined as a first layer, and a portion wound from outside the first layer in a direction perpendicular to the central axis is defined as a second layer, The m-th turn (where m is an integer of 2 or greater) of the first wire has a portion belonging to the first layer, the (m-1)-th turn of the second wire belongs to the first layer and has a first portion wound adjacent to the m-th turn of the first wire on the second flange side in the direction along the central axis, the (m+1)-th turn of the first wire belongs to the first layer and has a portion wound adjacent to the first portion on the second flange side in the direction along the central axis, the m-th turn of the second wire belongs to the second layer and has a 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 first wire and the first portion, and the (m+1)-th turn of the second wire belongs to the second layer and has a portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the first portion and the (m+1)-th turn of the first wire.

[0007] Further, 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 third external electrode and a fourth external electrode are provided at a second flange in a direction perpendicular to the central axis. When the portion wound from the first turn to the second layer is defined as a second layer, the k-th turn (where k is a positive integer) of the first wire has a portion that belongs to the first layer, the (k+1)-th turn of the first wire has a portion that belongs to the first layer and is wound adjacent to the k-th turn of the first wire on the second flange side in the direction along the central axis, the (k+2)-th turn of the first wire belongs to the second layer and has a second portion that is wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the k-th turn of the first wire and the (k+1)-th turn of the first wire, and the second wire has at least one turn wound on the first flange side of the second portion in the direction along the central axis and at least one turn wound on the second flange side of the second portion in the direction along the central axis. [Effects of the Invention]

[0008] 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]

[0009] [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 the winding of each wire of the coil component of the first embodiment on an end surface perpendicular to the vertical axis. [Figure 3] FIG. 3 is a schematic end view showing the winding of each wire of the coil component of the first embodiment on an end surface that includes the central axis and is perpendicular to the left-right axis. [Figure 4] FIG. 4 is a schematic end view showing the winding of wires of a coil component according to the second embodiment on an end surface perpendicular to the vertical axis. [Figure 5] FIG. 5 is a schematic end view showing the winding of each wire of the coil component of the second embodiment on an end surface that includes the central axis and is perpendicular to the left-right axis. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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.

[0011] (First embodiment) <Overall structure> As shown in FIG. 1, the coil device 10 includes a drum core 10C and a planar core 10F.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] <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.

[0027] 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.

[0028] 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.

[0029] As shown in FIG. 2 , the number of turns of the first wire 50 increases by one for each 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 5 , any point within the first turn is represented as "1." The same applies to other numbers of turns. Note that 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Furthermore, with regard to the first wire 50 and the second wire 60, the portion wound from the outside of the first layer L1 in the direction perpendicular to the central axis X is referred to as the second layer L2. <Regarding the Wire Winding Mode of the First Embodiment> As shown in FIG. 2 , the first to twelfth turns of the first wire 50 belong to the first layer L1. That is, when m is 12, the m-th turn of the first wire 50 has a portion that belongs to the first layer L1. The first to twelfth 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 mid-twelfth 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.

[0035] The 13th turn of the first wire 50 belongs to the first layer L1. The 13th turn of the first wire 50 is wound at a distance from the 12th turn of the first wire 50 on the second flange portion 31 side in the direction along the central axis X. Therefore, the first wire 50 has a larger helical pitch in the portion from the 12th turn to the 13th turn than in other portions.

[0036] The 14th turn of the first wire 50 belongs to the first layer L1. The 14th turn of the first wire 50 has a portion that is 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. A portion of the 14th turn of the first wire 50 that is wound around the winding core 11 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. Specifically, a portion of the 14th turn of the first wire 50 that is wound on the surface of the winding core 11 facing the rightward direction Z1 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. 2 and 3, a portion of the 14th turn of the first wire 50 wound on the lower surface of the winding core 11 and on the surface facing the left direction Z2 is wound away from the 13th turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. In this way, the entire portion of the first wire 50 wound around the winding core 11 belongs to the first layer L1.

[0037] 2, the first turn of the second wire 60 has a portion that belongs 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. Note that a portion of the first turn of the second wire 60 may belong to the second layer L2.

[0038] The second to eighth turns of the second wire 60 belong to the second layer L2. The second to eighth turns of the second wire 60 are wound 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. The second to mid-eighth turns 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 7) 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.

[0039] 3, a portion of the eighth turn of the second wire 60 is wound at a distance from the seventh turn of the second wire 60 on the second flange 31 side in the direction along the central axis X. Therefore, the first wire 50 has a larger spiral pitch in the portion from the eighth turn to the ninth turn than in other portions. Note that the portion from the eighth turn to the ninth turn of the first wire 50 may not be wound around the valley portion formed by the first layer L1.

[0040] The ninth and tenth turns of the second wire 60 belong to the second layer L2. The ninth and tenth turns of the second wire 60 are wound 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 ninth and tenth turns of the second wire 60 are wound adjacent to each other in the direction along the central axis X. The ninth 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 ninth and tenth turns of the first wire 50. That is, the jth turn (where j is an integer between 9 and 10) 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 (j+1)th and (j+2)th turns of the first wire 50.

[0041] 2, the 11th turn of the second wire 60 has a portion belonging to the second layer L2. In the first embodiment, this portion is a portion of the 11th turn of the second wire 60 that includes a portion wound on a surface facing the rightward direction Z1 of the winding core portion 11. This portion is wound adjacent to the 10th turn of the second wire 60 on the second flange portion 31 side in the direction along the central axis X.

[0042] 2 and 3, the 11th turn of the second wire 60 has a first portion 71 belonging to the first layer L1. In the first embodiment, the first portion 71 is a portion of the 11th turn of the second wire 60 that includes portions wound on the lower surface, the surface facing the left direction Z2, and the upper surface of the winding core portion 11. The first portion 71 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. That is, when m is 12, the (m-1)th turn of the second wire 60 belongs to the first layer L1 and has the first portion 71 wound adjacent to the mth turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. A portion of the 10th to 11th turns of the first wire 50 intersects a portion of the 12th to 13th turns of the first wire 50 that belongs to the first layer L1. Therefore, the first portion 71 may locally ride up onto the first layer L1. Note that, since the first portion 71 only locally rides up onto the first layer L1, in the present disclosure, the first portion 71 may be considered as being entirely part of the first layer L1.

[0043] Furthermore, the first portion 71 is wound adjacent to the 13th turn of the first wire 50 on the first flange 21 side in the direction along the central axis X. In other words, when m is 12, the (m+1)th turn of the first wire 50 belongs to the first layer L1 and has a portion wound adjacent to the first portion 71 on the second flange 31 side in the direction along the central axis X.

[0044] 2, the 12th turn of the second wire 60 has a portion that belongs to the first layer L1. Specifically, this portion is a portion of the 12th turn of the second wire 60 that includes a portion that is wound on a surface of the winding core 11 facing the rightward direction Z1. 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. Furthermore, this portion is wound adjacent to the 13th turn of the first wire 50 on the first flange 21 side in the direction along the central axis X.

[0045] 2 and 3, the twelfth turn of the second wire 60 has a portion that belongs to the second layer L2. Specifically, this portion includes portions of the twelfth turn of the second wire 60 that are wound on the lower surface, the surface facing the left direction Z2, and the upper surface of the winding core portion 11. This portion is wound adjacent to the tenth turn of the second wire 60 on the second flange portion 31 side in the direction along the central axis X. This portion is 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 first portion 71. That is, when m is 12, the m-th turn of the second wire 60 belongs to the second layer L2 and 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 m-th turn of the first wire 50 and the first portion 71.

[0046] 2, the 13th turn of the second wire 60 has a portion belonging to the second layer L2. A portion of the 13th turn of the second wire 60 is wound adjacent to the 11th turn of the second wire 60 on the second flange 31 side in the direction along the central axis X. This portion is a portion of the 13th turn of the second wire 60 that includes a portion wound on a surface of the winding core 11 facing the rightward direction Z1. This portion is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the 12th turn of the first wire 50 and the 12th turn of the second wire 60.

[0047] 2 and 3 , a remaining portion of the 13th turn of the second wire 60 is wound adjacent to the 12th turn of the second wire 60 on the second flange 31 side in the direction along the central axis X. This portion includes portions of the 13th turn of the second wire 60 wound on the lower surface, the surface facing the left direction Z2, and the upper surface of the winding core 11. This portion is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the first portion 71 and the 13th turn of the first wire 50. In other words, when m is 12, the (m+1)th turn of the second wire 60 belongs to the second layer L2 and has a portion wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the first portion 71 and the (m+1)th turn of the first wire 50.

[0048] 2, the 14th turn of the second wire 60 has a portion that belongs to the second layer L2. Specifically, this portion is a portion of the 14th turn of the second wire 60 that includes a portion that is wound on a surface of the winding core 11 facing the rightward direction Z1. This portion is wound adjacent to the 13th turn of the second wire 60 on the second flange 31 side in the direction along the central axis X. This portion is also wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the 12th turn of the second wire 60 and the 13th turn of the first wire 50.

[0049] 2 and 3, the 14th turn of the second wire 60 has a portion that belongs to the first layer L1. Specifically, this portion is a portion of the 14th turn of the second wire 60 that includes a portion that is wound on the lower surface of the winding core 11 and on a surface facing the left direction Z2. 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. This portion is also wound adjacent to the 14th turn of the first wire 50 on the first flange 21 side in the direction along the central axis X. The 14th turn of the second wire 60 also has a portion that is separated from the winding core 11 and connected to the fourth external electrode 44.

[0050] <Effects of the First Embodiment> (1-1) In the first embodiment, when m is 12, the (m-1)th turn of the second wire 60 has the first portion 71. Furthermore, the mth and (m+1)th turns of the second wire 60 have portions wound from the outside with respect to the first portion 71 in a direction perpendicular to the central axis X. That is, the three turns from the (m-1)th turn to the (m+1)th turn of the second wire 60 are wound with a small space in the direction along the central axis X. In contrast, the mth turn of the first wire 50 has a portion wound adjacent to the first portion 71 on the first flange 21 side in the direction along the central axis X. Furthermore, the (m+1)th turn of the first wire 50 has a portion wound adjacent to the first portion 71 on the second flange 31 side in the direction along the central axis X. In other words, the first wire 50 is wound across the first portion 71. In this way, the first wire 50 straddles a portion wound with three turns in a small space, so 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.

[0051] Specifically, as shown in FIG. 3 , in the first embodiment, the 10th turn of the second wire 60 has a portion that contacts the 11th and 12th turns of the first wire 50. On the other hand, the 14th turn of the second wire 60 has a portion that contacts the 13th and 14th turns of the first wire 50. In this way, at a location with fewer turns than the first portion 71, the (j+1)th and (j+2)th turns of the first wire 50 have a portion that contacts the jth turn of the second wire 60. Also, at a location with more turns than the first portion 71, the (p−1)th and pth turns of the first wire 50 contact the pth turn of the second wire 60. 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.

[0052] Furthermore, in the first embodiment, since the second wire 60 has the first portion 71, the space for winding the second wire 60 in the direction along the central axis X is smaller than in a configuration in which the second wire 60 as a whole belongs to 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 for winding the second wire 60 in the direction along the central axis X.

[0053] (1-2) In the first embodiment, the portion of the first wire 50 that is wound around the winding core 11 belongs entirely to the first layer L1. That is, compared to a configuration in which the first wire 50 is wound around both the first layer L1 and the second layer L2, the winding configuration of the first wire 50 in the first embodiment is simpler. With this configuration, it is possible to suppress winding irregularities when winding the first wire 50.

[0054] (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.

[0055] <Regarding the Wire Winding Mode of the Second Embodiment> 4, the first to sixth turns of the first wire 50 belong to the first layer L1. The first to sixth turns 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 intermediate sixth turns of the first wire 50 are wound adjacent to each other in the direction along the central axis X. That is, when n is 5, the nth turn and the (n+1)th turn of the first wire 50 have portions that belong to the first layer L1.

[0056] The seventh turn of the first wire 50 has a second portion 72 that belongs to the second layer L2. 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 first wire 50. In this way, when n is 5, the (n+2)th turn of the first wire 50 belongs to the second layer L2 and has the second portion 72 that is wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the nth turn of the first wire 50 and the (n+1)th turn of the first wire 50. Note that the portion of the second portion 72 that runs onto the second layer L2 does not have to be exactly at the 7.0th turn. For example, the portion of the second portion 72 that runs onto the second layer L2 may be after the 7.0th turn. In this case, a portion of the seventh turn of the first wire 50, including the 7.0th turn, may belong to the first layer L1. Furthermore, a portion of the 11th turn of the first wire 50, including the 8.0 turn, may belong to the second layer L2, continuing from the second portion 72. In this case, a portion of the 8th turn of the first wire 50 may also belong to the second layer L2. Furthermore, a portion of the first wire 50 just before the 7.0 turn may also belong to the second layer L2, continuing from the second portion 72. In this case, a portion of the 6th turn of the first wire 50 may also belong to the second layer L2.

[0057] The eighth to eleventh turns of the first wire 50 belong to the first layer L1. The eighth to eleventh turns 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 eighth to mid-eleventh turns of the first wire 50 are wound adjacent to each other in the direction along the central axis X. That is, when n is 5 and m is 11, the (n+3)th to mth turns of the first wire 50 belong to the first layer L1, and the greater the number of turns, the closer the turns are to the second flange 31 in the direction along the central axis X.

[0058] The twelfth turn of the first wire 50 belongs to the first layer L1. The twelfth turn of the first wire 50 is wound at a distance from the eleventh turn of the first wire 50 on the second flange portion 31 side in the direction along the central axis X. Therefore, the first wire 50 has a larger helical pitch in the portion from the eleventh turn to the twelfth turn than in other portions.

[0059] The thirteenth turn of the first wire 50 belongs to the first layer L1. The thirteenth turn of the first wire 50 is wound adjacent to the twelfth turn of the first wire 50 on the second flange portion 31 side in the direction along the central axis X.

[0060] The 14th turn of the first wire 50 belongs to the first layer L1. The 14th turn of the first wire 50 has a portion that is 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. A portion of the 14th turn of the first wire 50 that is wound around the winding core 11 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. Specifically, a portion of the 14th turn of the first wire 50 that is wound on a surface of the winding core 11 facing the rightward direction Z1 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. Furthermore, the remaining portion of the 14th turn of the first wire 50 is wound spaced apart from the 13th turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. Specifically, as shown in Figures 4 and 5, a portion of the 14th turn of the first wire 50 wound on the lower surface of the winding core portion 11 and the surface facing the left direction Z2 is wound adjacent to the 13th turn of the first wire 50 on the second flange portion 31 side in the direction along the central axis X.

[0061] 4, the first turn of the second wire 60 has a portion that belongs 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. Note that a portion of the first turn of the second wire 60 may belong to the second layer L2.

[0062] The second to fourth turns of the second wire 60 belong to the second layer L2. The second to fourth turns of the second wire 60 are wound 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 second to fourth turns 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 4) 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 and the i-th turn of the first wire 50.

[0063] The fifth turn of the second wire 60 belongs to the second layer L2. The fifth turn of the second wire 60 has a portion wound adjacent to the fourth turn of the second wire 60 on the second flange 31 side in the direction along the central axis X. This portion is wound adjacent to the seventh turn of the first wire 50 on the first flange 21 side in the direction along the central axis X. In other words, the fifth turn of the second wire 60 has a portion wound on the first flange 21 side of the second portion 72 in the direction along the central axis X. Therefore, the second wire 60 has at least one turn wound on the first flange 21 side of the second portion 72 in the direction along the central axis X.

[0064] In the fifth turn of the second wire 60, the portion wound adjacent to 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 fourth and fifth turns of the first wire 50. That is, this portion is wound on the first flange 21 side with respect to the fifth turn of the first wire 50 in the direction along the central axis X. In other words, when n is 5, the nth turn of the second wire 60 has a portion wound on the first flange 21 side with respect to the nth turn of the first wire 50 in the direction along the central axis X. Note that "the nth turn of the second wire 60 is wound on the first flange 21 side with respect to the nth turn of the first wire 50 in the direction along the central axis X" means that, when each wire is viewed from an end as shown in FIG. 5 , the center of the nth turn of the second wire 60 is located on the first flange 21 side with respect to the center of the nth turn of the first wire 50 in the direction along the central axis X. Note that a portion of the fifth to sixth turns of the second wire 60 may ride up over a portion of the sixth to seventh turns of the first wire 50 and be located outward from the second layer L2 in a direction perpendicular to the central axis X. That is, a portion of the fifth to sixth turns of the second wire 60 intersects with the second portion 72. Therefore, a portion of the fifth to sixth turns of the second wire 60 may locally ride up outward from the second layer L2 in a direction perpendicular to the central axis X. Note that because this is a local ride-up, in the present disclosure, the fifth to sixth turns of the second wire 60 may be considered as belonging entirely to the second layer L2.

[0065] The sixth turn of the second wire 60 belongs to the second layer L2. The sixth turn of the second wire 60 has a portion 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. Specifically, the sixth turn of the second wire 60 has a portion wound on the second flange 31 side with respect to the second portion 72 in the direction along the central axis X. In this way, the second wire 60 has at least one turn wound on the second flange 31 side with respect to the second portion 72 in the direction along the central axis X.

[0066] In the sixth turn of the second wire 60, the portion wound adjacent to 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 sixth and eighth turns of the first wire 50. That is, this portion is wound on the second flange 31 side with respect to the sixth turn of the first wire 50 in the direction along the central axis X. In other words, when n is 5, the (n+1)th turn of the second wire 60 has a portion wound on the second flange 31 side with respect to the (n+1)th turn of the first wire 50 in the direction along the central axis X.

[0067] The seventh turn to partway through the ninth turn of the second wire 60 belongs to the second layer L2. The seventh turn to partway through the ninth turn of the second wire 60 are wound 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. The seventh turn to partway through the ninth turn of the second wire 60 are wound adjacent to each other in the direction along the central axis X. The seventh 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 eighth and ninth turns of the first wire 50. That is, the jth turn (where j is an integer between 7 and 9) 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 (j+1)th turn and the (j+2)th turn of the first wire 50. Note that a portion of the ninth turn of the second wire 60 may belong to the first layer L1. In addition, when n is 5 and m is 11, the (n+1)th turn to the middle of the (m-2)th turn of the second wire 60 belong to the second layer L2, and the second wire 60 is wound in order so that the more the number of turns increases, the closer it is to the second flange 31 in the direction along the central axis X. 4 and 5, the tenth turn of the second wire 60 has a first portion 71 belonging to the first layer L1. The first portion 71 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. That is, when m is 11, the (m-1)th turn of the second wire 60 belongs to the first layer L1 and is wound adjacent to the mth turn of the first wire 50 on the second flange 31 side in the direction along the central axis X.

[0068] Furthermore, the first portion 71 is wound adjacent to the 12th turn of the first wire 50 on the first flange 21 side in the direction along the central axis X. That is, when m is 11, the (m+1)th turn of the first wire 50 belongs to the first layer L1 and has a portion wound adjacent to the first portion 71 on the second flange 31 side in the direction along the central axis X. Note that a portion of the 10th turn of the second wire 60 may belong to the second layer L2.

[0069] The 11th turn of the second wire 60 has a portion that belongs to the second layer L2. This portion is wound adjacent to the 9th turn of the second wire 60 on the second flange 31 side in the direction along the central axis X. 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 turn of the first wire 50 and the first portion 71. In other words, when m is 11, the mth turn of the second wire 60 belongs to the second layer L2 and 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 mth turn of the first wire 50 and the first portion 71.

[0070] 4, the twelfth turn of the second wire 60 belongs to the second layer L2. The twelfth turn of the second wire 60 is wound adjacent to the eleventh turn of the second wire 60 on the second flange 31 side in the direction along the central axis X. The twelfth 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 portion 71 and the twelfth turn of the first wire 50. In other words, when m is 11, the (m+1)th turn of the second wire 60 belongs to the second layer L2 and has a portion wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the first portion 71 and the (m+1)th turn of the first wire 50.

[0071] The thirteenth turn of the second wire 60 belongs to the second layer L2. The thirteenth turn of the second wire 60 is wound adjacent to the twelfth turn of the second wire 60 on the second flange 31 side in the direction along the central axis X. The thirteenth turn of the second wire 60 is wound from the outside in a direction perpendicular to the central axis X with respect to the twelfth and thirteenth turns of the first wire 50.

[0072] 4, the 14th turn of the second wire 60 has a portion belonging to the second layer L2. Specifically, this portion is a portion of the 14th turn of the second wire 60 that includes a portion wound on a surface of the winding core 11 facing the rightward direction Z1. This portion is wound adjacent to the 13th turn of the second wire 60 on the second flange 31 side in the direction along the central axis X. This portion is also wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the 13th and 14th turns of the first wire 50.

[0073] 4 and 5, the 14th turn of the second wire 60 has a portion that belongs to the first layer L1. Specifically, this portion is a portion of the 14th turn of the second wire 60 that includes a portion that is wound on the lower surface of the winding core 11 and on a surface facing the left direction Z2. 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. This portion is also wound adjacent to the 14th turn of the first wire 50 on the first flange 21 side in the direction along the central axis X. The 14th turn of the second wire 60 also has a portion that is separated from the winding core 11 and connected to the fourth external electrode 44.

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

[0075] (2-1) In the second embodiment, when n is 5, the (n+2)th turn of the first wire 50 has a second portion 72 wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the nth turn and the (n+1)th turn of the first wire 50. These three turns from the nth turn to the (n+2)th turn are wound in a small space along the central axis X. In contrast, the second wire 60 has at least one turn wound on the first flange 21 side of the second portion 72 in the direction along the central axis X. Furthermore, the second wire 60 has at least one turn wound on the second flange 31 side of the second portion 72 in the direction along the central axis X. In other words, the second wire 60 is wound across the second portion 72. In this way, the second wire 60 straddles the second portion 72, thereby straddling a portion wound with three turns in a small space, thereby changing 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 second portion 72.

[0076] Specifically, in the second embodiment, as shown in FIG. 5 , the fourth turn of the second wire 60 has a portion where it contacts the third and fourth turns of the first wire 50. Meanwhile, the seventh turn of the second wire 60 has a portion where it contacts the eighth and ninth turns of the first wire 50. Thus, in a location with fewer turns than the second portion 72, the (i-1)th and i-th turns of the first wire 50 have a portion where they contact the i-th turn of the second wire 60. Furthermore, in a location with more turns than the second portion 72, the (j+1)th and (j+2)th turns of the first wire 50 have a portion where they contact the j-th turn of the second wire 60. That is, the difference in the number of turns between the first wire 50 and the second wire 60 before and after the second portion 72 is changed.

[0077] Furthermore, in the first embodiment, since the first wire 50 has the second portion 72, the space for winding the second wire 60 in the direction along the central axis X is smaller than in a configuration in which the first wire 50 as a whole belongs to the first layer L1. 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 further reducing the space for winding the first wire 50 in the direction along the central axis X.

[0078] (2-2) In the second embodiment, the nth turn of the second wire 60 has a portion wound on the first flange 21 side relative to the nth turn of the first wire 50 in the direction along the central axis X. Furthermore, the (n+1)th turn of the second wire 60 has a portion wound on the second flange 31 side relative to the (n+1)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 relationship is reversed from the nth turn to the (n+1)th turn. When such a front-to-back relationship of the wires occurs, the sign of the stray capacitance may change between before the nth turn and after the (n+1)th turn.

[0079] (2-3) In the second embodiment, the (n+3)th to mth turns of the first wire 50 belong to the first layer L1, and are wound in order 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. Also, in the second embodiment, the (n+1)th to midway through the (m-2)th turn of the second wire 60 belong to the second layer L2, and are wound in order 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. That is, in the first wire 50, the turn next to the second portion 72 to the turn adjacent to the first portion 71 of the second wire 60 belongs to the first layer L1. Also, in the second wire 60, the turn adjacent to the second portion 72 to midway through the turn before the first portion 71 belongs to the second layer L2. That is, within the range of the turns, the vertical relationship between the first layer L1 and the second layer L2 of the first wire 50 and the second wire 60 is not reversed. With this configuration, winding irregularities are unlikely to occur within the range of the turns, and unintentional changes in the positional relationship of the wires can be suppressed.

[0080] <Example of change> The above-described first embodiment, second embodiment, and the following modified examples can be implemented in combination with each other within the scope of technical compatibility.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] In the first and second embodiments, as long as the m-th turn of the first wire 50, the (m+1)-th turn of the first wire 50, and the (m-1)-th turn of the second wire 60 belong to the first layer L1, the turn and the number of turns belonging to the first layer L1 are not limited. Also, as long as the m-th turn and the (m+1)-th turn of the second wire 60 belong to the second layer L2, the turn and the number of turns belonging to the second layer L2 are not limited.

[0089] In the first and second embodiments, it is sufficient that the first portion 71 of the second wire 60 is wound adjacent to the m-th turn of the first wire 50 on the second flange 31 side in the direction along the central axis X. Also, it is sufficient that the (m+1)-th turn of the first wire 50 has a portion wound adjacent to the first portion 71 on the second flange 31 side in the direction along the central axis X. As long as the above conditions are met, the arrangement of the turns of each wire in the first layer L1 in the direction along the central axis X is not limited to the example in the above embodiments.

[0090] In the first and second embodiments, it is sufficient that the m-th 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 m-th turn of the first wire 50 and the first portion 71. Also, it is sufficient that the (m+1)-th 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 first portion 71 and the (m+1)-th turn of the first wire 50. As long as the above conditions are satisfied, the arrangement of the turns of each wire in the second layer L2 in the direction along the central axis X is not limited to the example in the above embodiments.

[0091] In the first embodiment, a portion of the first wire 50 that is wound around the winding core 11 may be located on the second layer L2 or on the outside of the second layer L2 in a direction perpendicular to the central axis X.

[0092] In the first embodiment, the first portion 71 of the second wire 60 is not limited to the 11th turn of the second wire 60. When m is an integer of 2 or greater, it is sufficient that the (m-1)th turn of the second wire 60 has the first portion 71. This also applies to the second embodiment.

[0093] In the second embodiment, the (n+2)th turn of the second wire 60 may not have the second portion 72. That is, the entire portion of the second wire 60 wound around the winding core 11 may belong to the first layer L1.

[0094] In the second embodiment, the second portion 72 of the first wire 50 is not limited to the seventh turn. When m is an integer equal to or greater than 4 and n is an integer equal to or less than m-3, it is sufficient that the (n+2)th turn of the first wire 50 has the second portion 72.

[0095] In the second embodiment, the nth turn of the second wire 60 may be wound on the first flange 21 side with respect to the nth turn of the first wire 50 in the direction along the central axis X, and the (n+1)th turn of the second wire 60 may have a portion wound on the first flange 21 side with respect to the (n+1)th turn of the first wire 50 in the direction along the central axis X. Furthermore, the nth turn of the second wire 60 may be wound on the second flange 31 side with respect to the nth turn of the first wire 50 in the direction along the central axis X, and the (n+1)th turn of the second wire 60 may have a portion wound on the second flange 31 side with respect to the (n+1)th turn of the first wire 50 in the direction along the central axis X.

[0096] In the second embodiment, from the viewpoint of changing the difference in the number of turns between the contacting first wire 50 and second wire 60 while minimizing the space required in the direction along the central axis X, the second wire 60 does not necessarily have to have the first portion 71. That is, it is sufficient that the first wire 50 has the second portion 72. In this case, it is sufficient that the k-th turn (where k is a positive integer) of the first wire 50 belongs to the first layer L1. Furthermore, in this case, it is sufficient that the (k+1)-th turn of the first wire 50 belongs to the first layer L1 and has a portion wound adjacent to the k-th turn of the first wire 50 on the second flange portion 31 side in the direction along the central axis X. In this case, the (k+2)th turn of the first wire 50 belongs to the second layer L2, and has a second portion 72 wound from the outside in a direction perpendicular to the central axis X with respect to a valley portion between the kth turn of the first wire 50 and the (k+1)th turn of the first wire 50. In this case, the second wire 60 has at least one turn wound on the first flange 21 side of the second portion 72 in the direction along the central axis X, and has at least one turn wound on the second flange 31 side of the second portion 72 in the direction along the central axis X.

[0097] <Additional Notes> The technical concepts that can be understood from the above-described embodiments and modifications will be described below. [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 the first end, first and second external electrodes provided at the first flange portion, a third and fourth external electrode provided at the second flange portion, a first wire wound around the winding core portion, 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 portion 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 wound directly around the winding core portion is defined as a first layer and a portion wound from outside the first layer in a direction perpendicular to the central axis is defined as a second layer, a coil component in which the m-th turn (where m is an integer of 2 or greater) has a portion belonging to the first layer, the (m-1)-th turn of the second wire belongs to the first layer and has a first portion wound adjacent to the m-th turn of the first wire on the second flange side in the direction along the central axis, the (m+1)-th turn of the first wire belongs to the first layer and has a portion wound adjacent to the first portion on the second flange side in the direction along the central axis, the m-th turn of the second wire belongs to the second layer and has a 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 first wire and the first portion, and the (m+1)-th turn of the second wire belongs to the second layer and has a portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the first portion and the (m+1)-th turn of the first wire.

[0098] [2] The coil component according to [1], wherein the portion of the first wire wound around the winding core portion entirely belongs to the first layer. [3] The coil component according to [1], wherein the n-th turn of the first wire (where m is an integer greater than or equal to 4 and n is an integer less than or equal to m-3) has a portion belonging to the first layer, the (n+1)-th turn of the first wire belongs to the first layer and has a portion wound adjacent to the n-th turn of the first wire on the second flange side in the direction along the central axis, the (n+2)-th turn of the first wire belongs to the second layer and has a second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the n-th turn of the first wire and the (n+1)-th turn of the first wire, and the second wire has at least one turn wound on the first flange side of the second portion in the direction along the central axis and at least one turn wound on the second flange side of the second portion in the direction along the central axis.

[0099] [4] A coil component according to [3], wherein the n-th turn of the second wire has a portion wound on the first flange side relative to the n-th turn of the first wire in the direction along the central axis, and the (n+1)-th turn of the second wire has a portion wound on the second flange side relative to the (n+1)-th turn of the first wire in the direction along the central axis.

[0100] [5] The coil component according to [3] or [4], wherein the (n+3)th turn to the mth turn of the first wire belong to the first layer and are wound in order so that the greater the number of turns, the closer to the second flange portion in the direction along the central axis; and the (n+1)th turn to the middle of the (m-2)th turn of the second wire belong to the second layer and are wound in order so that the greater the number of turns, the closer to the second flange portion in the direction along the central axis.

[0101] [6] 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 second layer extending from the outside of the first layer in a direction perpendicular to the central axis is a second layer. When the wound portion is defined as a second layer, the k-th turn (where k is a positive integer) of the first wire has a portion that belongs to the first layer, the (k+1)-th turn of the first wire has a portion that belongs to the first layer and is wound adjacent to the k-th turn of the first wire on the second flange side in the direction along the central axis, the (k+2)-th turn of the first wire belongs to the second layer and has a second portion that is wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the k-th turn of the first wire and the (k+1)-th turn of the first wire, and the second wire has at least one turn wound on the first flange side of the second portion in the direction along the central axis and at least one turn wound on the second flange side of the second portion in the direction along the central axis. [Explanation of symbols]

[0102] L1…1st layer L2…Second 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

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; When a portion wound from the outside of the first layer in a direction perpendicular to the central axis is defined as a second layer, an m-th turn (where m is an integer of 2 or more) of the first wire has a portion belonging to the first layer, the (m-1)-th turn of the second wire belongs to the first layer and has a first portion wound adjacent to the m-th turn of the first wire on the second flange side in the direction along the central axis, the (m+1)-th turn of the first wire belongs to the first layer and has a portion wound adjacent to the first portion on the second flange side in the direction along the central axis, the m-th turn of the second wire belongs to the second layer and has a 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 first wire and the first portion, The (m+1)-th turn of the second wire belongs to the second layer and has a portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the first portion and the (m+1)-th turn of the first wire. Coil parts.

2. The portion of the first wire wound around the winding core portion all belongs to the first layer. The coil component according to claim 1 .

3. the n-th turn of the first wire (where m is an integer of 4 or more and n is an integer of m-3 or less) has a portion belonging to the first layer, the (n+1)-th turn of the first wire belongs to the first layer and has a portion wound adjacent to the n-th turn of the first wire on the second flange side in the direction along the central axis, the (n+2)-th turn of the first wire belongs to the second layer and has a second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the n-th turn of the first wire and the (n+1)-th turn of the first wire; The second wire has at least one turn wound on the first flange side of the second portion in the direction along the central axis, and has at least one turn wound on the second flange side of the second portion in the direction along the central axis. The coil component according to claim 1 .

4. the n-th turn of the second wire has a portion wound on the first flange side with respect to the n-th turn of the first wire in the direction along the central axis, The (n+1)-th turn of the second wire has a portion wound on the second flange side with respect to the (n+1)-th turn of the first wire in the direction along the central axis. The coil component according to claim 3 .

5. the (n+3)th turn to the mth turn of the first wire belong to the first layer, and are wound in order such that the increasing number of turns is closer to the second flange portion in the direction along the central axis; The (n+1)th turn to the middle of the (m-2)th turn of the second wire belong to the second layer, and the turns are wound in order so that the more the number of turns increases, the closer to the second flange portion in the direction along the central axis. The coil component according to claim 3 or 4.

6. 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; When a portion wound from the outside of the first layer in a direction perpendicular to the central axis is defined as a second layer, a k-th turn (where k is a positive integer) of the first wire has a portion belonging to the first layer; the (k+1)-th turn of the first wire belongs to the first layer and has a portion wound adjacent to the k-th turn of the first wire on the second flange side in the direction along the central axis, the (k+2)-th turn of the first wire belongs to the second layer and has a second portion wound from the outside in a direction perpendicular to the central axis with respect to a valley portion between the k-th turn of the first wire and the (k+1)-th turn of the first wire; The second wire has at least one turn wound on the first flange side of the second portion in the direction along the central axis, and has at least one turn wound on the second flange side of the second portion in the direction along the central axis. Coil parts.

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