Coil component

Abstract

To allow adverse effects on characteristics of a coil component to be reduced.SOLUTION: A coil component 10 includes a drum core 10C, a first wire 50, and a second wire 60. The drum core 10C has a winding core part 11, a first flange 21, and a second flange 31. The second wire 60 is provided with a first wound part 71, a second wound part 72, and a third wound part 73. The second wound part 72 is located on the second flange 31 side relative to the first wound part 71 in a direction along a central axis X, and at least a part thereof is wound around an outer peripheral surface of the winding core part 11. In the second wound part 72, when the second wire 60 is traced from a first end 61 to a second end 62, the second wire 60 has a first intersection 81 and a second intersection 82 crossing the specific one winding of the first wire 50 within a range that the wire is wound twice.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 drum-shaped core, four external electrodes, a first wire, and a second wire. The drum-shaped core includes a winding core portion, a first flange portion, and a second flange portion. The winding core portion is shaped like a rectangular pillar. The first flange portion is connected to a first end of the winding core portion. The second flange portion is connected to a second end of the winding core portion. Two of the four external electrodes are located on the surface of the first flange portion. The remaining two external electrodes are located on the surface of the second flange portion.

[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 in the same direction as the first wire. Additionally, the second wire is wound generally around the outside of 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 the coil component described in Patent Document 1, the second wire is wound entirely outside the first wire. Therefore, the length of the portion of the second wire wound around the winding core is longer than the length of the portion of the first wire wound around the winding core. The longer the length of the wire wound around the winding core, the greater the DC resistance of that wire. Therefore, as the difference between the length of the first wire wound around the winding core and the length of the second wire wound around the winding core increases, the difference in DC resistance between the wires increases. This difference in DC resistance may have an adverse effect on the characteristics required of the coil component. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a drum core having a columnar winding core, a first flange provided at a first end in a direction along the central axis of the winding core, and 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, The coil component comprises a first winding portion wound around the outer periphery of the first wire, a second winding portion located on the second flange portion side of the first winding portion in the direction along the central axis and at least a portion of which is wound around the outer periphery of the winding core portion, and a third winding portion located on the second flange portion side of the second winding portion in the direction along the central axis and wound around the outer periphery of the first wire over multiple turns, wherein when the second wire is traced from the first end to the second end in the second winding portion, the second wire has a first intersection point and a second intersection point that intersect with a specific turn of the first wire within a range of two turns. [Effects of the Invention]

[0007] According to the above configuration, adverse effects on the characteristics of the coil component can be reduced. [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 plan view of the coil component of the first embodiment. [Figure 3] FIG. 3 is a diagram illustrating the state of winding of each wire when the coil component of the first embodiment is viewed downward. [Figure 4] FIG. 4 is a diagram illustrating the state of winding of each wire when the coil component of the first embodiment is viewed from the left. [Figure 5] FIG. 5 is a diagram illustrating the state of winding of each wire when the coil component of the second embodiment is viewed downward. [Figure 6] FIG. 6 is a diagram illustrating the state of winding of each wire when the coil device according to the second embodiment is viewed from the left. [Figure 7] FIG. 7 is a diagram illustrating the state of winding of each wire when the coil component of the third embodiment is viewed downward. [Figure 8] FIG. 8 is a diagram illustrating the state of winding of each wire when the coil device according to the third embodiment is viewed from the left. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, first, second, and third embodiments of the coil component 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] (Regarding the first embodiment) 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 alumina, Ni-Zn ferrite, synthetic resin, or a mixture thereof.

[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, when viewed in a direction along the central axis X, 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 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 11. One of the directions along the central axis X is referred to as a first positive direction X1, and the direction opposite to the first positive direction X1 is referred to as a first negative direction X2. In the first embodiment, the first positive direction X1 coincides with the direction from the winding core 11 toward the first flange 21. The first negative direction X2 coincides with the direction from the winding core 11 toward the second flange 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 in the direction along the vertical axis Y, and the term "lower surface" refers to a surface facing the downward direction Y2. Note that the "upper surface" does not necessarily have to be strictly perpendicular to the upward direction Y1. For example, when the coil device 10 is viewed from the upward direction Y1 toward the downward direction Y2, the "upper surface of the coil device 10" refers to the surface that can be seen. The same applies to the lower surface.

[0015] When viewed along the central axis X, the first flange portion 21 projects 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 passes through and is parallel to the central axis X. The first flange portion 21 has an outer end surface 21A. The outer end surface 21A is the surface of the outer surface of the first flange portion 21 that faces the first positive direction X1.

[0016] The first flange 21 has a main body 22 and a protrusion 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 first 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 first 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 protrusion 23 protrudes from the top surface of the main body 22 in the upward direction Y1. The protrusion 23 has a truncated quadrangular pyramid shape whose dimension along the left-right axis Z decreases toward the upward direction Y1. The protrusion 23 is located approximately in the center of the main body 22 in the direction along the left-right axis Z. The dimension of the protrusion 23 along the central axis X is the same as the dimension of the main body 22 in the direction along the central axis X. The main body 22 and the protrusion 23 are integrally molded. In other words, there is no clear boundary between the main body 22 and the protrusion 23 inside the first flange 21.

[0018] The second flange 31 and the first flange 21 are symmetrical with respect to a virtual plane that passes through the center of the winding core 11 and is parallel to the left-right axis Z. 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 up-down axis Y and the left-right axis Z. The second flange 31 has an outer end surface 31A that faces the first negative direction X2. The second flange 31 has a main body 32 and a protruding portion 33. The main body 32 and the protruding portion 33 of the second flange 31 have the same configuration as the main body 22 and the protruding portion 23 of the first flange 21. That is, the protruding portion 33 protrudes upward in the Y1 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 first flange 21. The first external electrode 41 is located on the first flange 21 on the left side in the Z2 direction with respect to the central axis X.

[0021] The first external electrode 41 has adhesive portions AP, connecting portions BP, mounting portions CP, extension portions DP, and joint portions EP. The adhesive portions AP, connecting portions BP, mounting portions CP, extension portions DP, and joint portions EP are integrally molded. That is, there are no clear boundaries between these components inside the first external electrode 41.

[0022] The adhesive part AP is substantially plate-shaped and is attached to the outer end surface 21A of the first flange part 21 via an adhesive. The adhesive part AP is a portion of the first external electrode 41 that faces the outer end surface 21A of the first flange part 21 in the direction along the central axis X.

[0023] The connecting portion BP is connected to the end of the adhesive portion AP in the upward direction Y1. The connecting portion BP is generally plate-shaped. The connecting portion BP extends in the upward direction Y1 from the adhesive portion AP. That is, when viewed in the first negative direction X2, the connecting portion BP protrudes from the first flange portion 21 in the upward direction Y1. Specifically, the connecting portion BP protrudes in the upward direction Y1 relative to the protrusion 23 of the first flange portion 21. The connecting portion BP is bent by approximately 90 degrees midway toward the first negative direction X2. That is, the end of the connecting portion BP opposite the adhesive portion AP faces the first negative direction X2.

[0024] The mounting portion CP is connected to the end of the connecting portion BP opposite to the adhesive portion AP. The mounting portion CP is flat. The main surface of the mounting portion CP is perpendicular to the vertical axis Y. The mounting portion CP is the portion of the first external electrode 41 located furthest upward in the Y1 direction. The mounting portion CP is spaced apart in the upward Y1 direction from the protruding portion 23 of the first flange portion 21. In other words, there is a gap between the mounting portion CP and the first flange portion 21. The upper surface of the mounting portion CP is the mounting surface that faces the substrate when the coil component 10 is mounted on the substrate.

[0025] A first end of the extension portion DP is connected to the end of the mounting portion CP on the left side in the Z2 direction. The extension portion DP is generally plate-shaped. The extension portion DP extends generally obliquely from the mounting portion CP toward the left side in the Z2 direction and downward in the Y2 direction. In other words, when viewed from a direction along the central axis X, the extension portion DP is generally L-shaped.

[0026] The joint portion EP is connected to a second end of the extension portion DP. The joint portion EP is generally plate-shaped. When viewed in the downward direction Y2, the joint portion EP has a generally rectangular shape elongated in the direction along the central axis X.

[0027] The joint EP faces the upper surface of the main body 22 of the first flange 21 along the vertical axis Y. That is, the lower surface of the joint EP faces the upper surface of the first flange 21. The lower surface of the joint EP is in contact with the upper surface of the first flange 21. Meanwhile, the lower surface of the joint EP is not fixed to the first flange 21. That is, no adhesive or the like is interposed between the joint EP and the first flange 21. In this way, if the joint EP to which the end of the wire is connected is located on the upward Y1 side of the first flange 21 with respect to the central axis X, it can be said that the first external electrode 41 is located on the upward Y1 side of the first flange 21 with respect to the central axis X.

[0028] The second external electrode 42 is provided on the first flange 21. That is, the second external electrode 42 is attached to the first flange 21. The second external electrode 42 is located on the rightward Z1 side of the central axis X in the first flange 21. The second external electrode 42 and the first external electrode 41 are symmetrical with respect to an imaginary plane that passes through the central axis X and is perpendicular to the left-right axis Z. Therefore, the second external electrode 42 has an adhesive portion AP, a connecting portion BP, a mounting portion CP, an extension portion DP, and a joint portion EP. The second external electrode 42 is located on the upward Y1 side of the first flange 21 with respect to the central axis X.

[0029] The third external electrode 43 is provided on the second flange 31. That is, the third external electrode 43 is attached to the second flange 31. The third external electrode 43 is located on the leftward Z2 side of the central axis X in the second flange 31. That is, the third external electrode 43 faces the first external electrode 41 in the direction along the central axis X. The third external electrode 43 and the first external electrode 41 are symmetrical with respect to an imaginary plane that passes through the center of the winding core 11 and is parallel to the left-right axis Z. Therefore, as shown in FIG. 2 , the third external electrode 43 has an adhesive portion AP, a connecting portion BP, a mounting portion CP, an extension portion DP, and a joint portion EP. The third external electrode 43 is located on the upward Y1 side of the second flange 31 with respect to the central axis X.

[0030] As shown in FIG. 1 , the fourth external electrode 44 is provided on the second flange 31. That is, the fourth external electrode 44 is attached to the second flange 31. The fourth external electrode 44 is located on the rightward Z1 side of the second flange 31 with respect to the central axis X. That is, the fourth external electrode 44 faces the second external electrode 42 in the direction along the central axis X. The fourth external electrode 44 and the second external electrode 42 are symmetrical with respect to an imaginary plane that passes through the center of the winding core 11 and is parallel to the left-right axis Z. Therefore, as shown in FIG. 2 , the fourth external electrode 44 has an adhesive portion AP, a connecting portion BP, a mounting portion CP, an extension portion DP, and a joint portion EP. The fourth external electrode 44 is located on the upward Y1 side of the second flange 31 with respect to the central axis X.

[0031] <Regarding the first and second wires> As shown in FIG. 2, the coil device 10 includes a first wire 50 and a second wire 60. Although not shown, the first wire 50 includes a copper wire and an insulating coating. The insulating coating covers the outer surface of the copper wire. 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. Note that in FIGS. 3 to 8, the first wire 50 is colored with dots.

[0032] 1 and 2, a first end 51 of the first wire 50 is connected to the joint EP of the first external electrode 41 by thermocompression bonding. A second end 52 of the first wire 50 is connected to the joint EP of the third external electrode 43 by thermocompression bonding. Thermocompression bonding is a method of clamping a wire between an external electrode and a heated jig, and fixing the wire to the external electrode while melting the wire. As a result of this fixing method, the insulating coating of the wire is peeled off near the joint with the external electrode, exposing the copper wire.

[0033] Here, the point where the first wire 50 first comes into contact with the outer circumferential surface of the winding core 11 when tracing the first wire 50 from the first end 51 to the second end 52 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 ridge line on the rightward Z1 side and upward Y1 side of the winding core 11.

[0034] As shown in FIGS. 3 and 4 , the number of turns of the first wire 50 increases by one each time the first wire 50 makes one revolution around the central axis X from the first end 51 to the second end 52. When viewed in the first negative direction X2, the first wire 50 is wound around the winding core 11 so that the winding progresses clockwise as the number of turns increases. Therefore, for example, when viewed in the first negative direction X2, the point 36 degrees around the central axis X from the 1.0 turn point of the first wire 50 is the 1.1 turn point of the first wire 50. Note that FIG. 3 schematically illustrates the number of turns of each wire at the ridgeline position on the upward direction Y1 side of the winding core 11. Also, FIG. 4 schematically illustrates the number of turns of each wire located on the central axis X of the winding core 11 when viewed in the leftward direction Z2.

[0035] 3, the first wire 50 is wound directly around the outer circumferential surface of the winding core 11 over the entire circumference without using the second wire 60. Here, "directly wound" does not only mean a state in which the first wire 50 is in contact with the outer circumferential side of the winding core 11, but also includes a state in which the first wire 50 is wound around the winding core 11 without using any other wire between the first wire 50 and the winding core 11, even if the wire is floating.

[0036] The first turn of the first wire 50 refers to the section from the 1.0 turn of the first wire 50 to just before the 2.0 turn of the first wire 50. The same applies to the second wire 60. The final turn of the first wire 50 refers to the turn that includes the last contact point with the outer circumferential side of the winding core 11 when tracing the first wire 50 from the first end 51 to the second end 52. In FIGS. 3 and 4, the portion of each wire that is located closer to the first end than the 1.0 turn is illustrated as 0 turn.

[0037] 2, the second wire 60 has the same configuration as the first wire 50. That is, the second wire 60 includes a copper wire and an insulating coating. The second wire 60 has a first end 61 and a second end 62 opposite the first end 61.

[0038] A first end 61 of the second wire 60 is connected to the joint EP of the second external electrode 42 by thermocompression bonding. A second end 62 of the second wire 60 is connected to the joint EP of the fourth external electrode 44 by thermocompression bonding.

[0039] 3 and 4 , when the second wire 60 is traced 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, 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 with the central axis X when viewed in a direction along the central axis X.

[0040] 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 first negative direction X2, the second wire 60 is wound around the winding core 11 so as to progress clockwise as the number of turns increases. That is, the second wire 60 is wound in the same direction as the first wire 50. A portion of the second wire 60 is wound around the winding core 11 from the outside relative to the first wire 50. In other words, a portion of the second wire 60 contacts the outer peripheral surface of the first wire 50 on the side opposite to the surface facing the central axis X. The final turn of the second wire 60 is the turn that includes the portion of the second wire 60 that last contacts the outer peripheral surface of the winding core 11 when tracing the second wire 60 from the first end 61 to the second end 62.

[0041] <Regarding the winding of the first wire and the second wire> 3, in the first embodiment, the final turn of the first wire 50 is 30 turns. In the first embodiment, the final turn of the second wire 60 is 30 turns.

[0042] As described above, the first wire 50 is wound directly around the outer peripheral surface of the winding core 11 over the entire circumference without using the second wire 60. From the first turn to partway through the 15th turn of the first wire 50, the individual turns are in contact with each other in the direction along the central axis X. On the other hand, the 15.0 turn and the 16.0 turn of the first wire 50 are separated in the direction along the central axis X. From the 16th turn to the 28th turn of the first wire 50, the individual turns are in contact with each other in the direction along the central axis X.

[0043] Furthermore, the 28.0 turn location of the first wire 50 and the 29.0 turn location of the first wire 50 are in contact with each other in the direction along the central axis X. On the other hand, at the ridge line on the upward Y1 side and leftward Z2 side of the winding core portion 11, the 28th turn and the 29th turn of the first wire 50 are spaced apart in the direction along the central axis X. Furthermore, the 30th turn of the first wire 50 is spaced apart from the 29th turn of the first wire 50 in the direction along the central axis X.

[0044] As shown in FIGS. 2 and 3, the second wire 60 includes a first winding portion 71, a second winding portion 72, a third winding portion 73, and a fourth winding portion 74. 3 , the first winding portion 71 is a portion of the second wire 60 that is wound around the outer circumferential surface of the first wire 50 over a plurality of turns. In the first embodiment, the first winding portion 71 is a portion from the first turn to the middle of the 14th turn of the second wire 60. In other words, the first winding portion 71 is a portion of the second wire 60 that extends from the point where the second wire 60 rides up onto the outer circumferential side of the first wire 50 to the point immediately before being directly wound around the outer circumferential surface of the winding core 11.

[0045] Here, I is a positive integer. A groove formed between two adjacent turns of wire is defined as a valley of the wire. In this case, in the first winding portion 71, the I-th turn of the second wire 60 is located between the I-th turn of the first wire 50 and the (I+1)-th turn of the first wire 50. Specifically, for example, the first turn of the second wire 60 is located in the valley between the first turn of the first wire 50 and the second turn of the first wire 50.

[0046] The second winding portion 72 is located on the second flange portion 31 side relative to the first winding portion 71 in the direction along the central axis X. The second winding portion 72 is a portion of the second wire 60 that is at least partially wound around the outer circumferential surface of the winding core 11. Specifically, the second winding portion 72 is a portion of the second wire 60 that extends from the middle of the 14th turn to the middle of the 17th turn. The 15.0 turn, 16.0 turn, and 17.0 turn locations of the second wire 60 are wound directly around the outer circumferential surface of the winding core 11 between the 15.0 turn and 16.0 turn locations of the first wire 50.

[0047] The second wire 60 crosses the 15th turn of the first wire 50 at the 15th and 16th turns of the second wire 60. Here, "crossing" means that when one wire is traced from the first end to the second end, the one wire in the same layer as the other wire first rides over the outer periphery of the other wire and then returns to the same layer as the other wire.

[0048] Specifically, the 15th turn of the second wire 60 has a first intersection point 81 where it intersects with the 15th turn of the first wire 50. Also, the 16th turn of the second wire 60 has a second intersection point 82 where it intersects with the 15th turn of the first wire 50.

[0049] That is, in the second winding portion 72, when the second wire 60 is traced from the first end 61 to the second end 62, the second wire 60 has a first intersection point 81 and a second intersection point 82 that intersect with a specific turn of the first wire 50 within the range of two turns of winding. Note that in this embodiment, as shown in FIG. 2 , the "intersection point" refers to a point where the center lines of the wires overlap when viewed in a direction perpendicular to the central axis X of the winding core portion 11.

[0050] 3, the first intersection 81 is a point where, when the second wire 60 is traced from the first end 61 to the second end 62, the first wire 50 crosses over from the second flange 31 side to the first flange 21 side in the direction along the central axis X. Similarly, the second intersection 82 is a point where the first wire 50 crosses over from the second flange 31 side to the first flange 21 side in the direction along the central axis X.

[0051] The first intersection point 81 and the second intersection point 82 are located on the outer peripheral surface of the winding core 11 facing the upward direction Y1. That is, the first intersection point 81, the second intersection point 82, and the joint portion EP of the first external electrode 41 are located on the mounting surface side. In other words, the first intersection point 81 and the second intersection point 82 are located on the outer peripheral surface of the winding core 11 on the upward direction Y1 side with respect to the central axis X. Therefore, the first intersection point 81 is located after approximately 15.75 turns of the 15th turn. Similarly, the second intersection point 82 is located after approximately 16.75 turns of the 16th turn.

[0052] The second wire 60 runs from the outer peripheral surface of the winding core 11 onto the outer peripheral side of the first wire 50 midway through the 17th turn. Specifically, the second wire 60 runs onto the outer peripheral side of the first wire 50 within a range of 17.5 turns or more and less than 18.0 turns. The location where the second wire 60 runs onto the outer peripheral side of the first wire 50 at the 17th turn is the valley between the 16th turn of the first wire 50 and the 16th turn of the second wire 60.

[0053] The third winding portion 73 is located on the second flange 31 side relative to the second winding portion 72 in the direction along the central axis X. The third winding portion 73 is a portion of the second wire 60 that is wound outer circumferentially around the first wire 50 over a plurality of turns. In the first embodiment, the third winding portion 73 is a portion of the second wire 60 that extends from the middle of the 17th turn to the middle of the 28th turn. In other words, the third winding portion 73 is a portion of the second wire 60 that extends from the point where the second wire 60 rides up onto the outer circumferential side of the first wire 50 to the point immediately before it is directly wound around the outer circumferential surface of the winding core 11.

[0054] The 17th turn of the second wire 60 is located in a valley between the 16th turn of the second wire 60 and the 16th turn of the first wire 50, on the ridge line on the upward Y1 side and leftward Z2 side of the winding core 11. From the 18th turn of the second wire 60 to the middle of the 23rd turn of the second wire 60, the I-th turn of the second wire 60 is located in a valley between the (I-2)th turn of the first wire 50 and the (I-1)th turn of the first wire 50.

[0055] The second wire 60 crosses the 22nd and 23rd turns of the first wire 50 at the 23rd turn of the second wire 60. Here, "crossing" means that one wire crosses over the other wire without reaching the same layer as the other wire. Because of the existence of such crossing points, the second wire 60 has a portion that contacts the 22nd turn, a portion that contacts the 23rd turn, and a portion that contacts the 24th turn of the first wire 50 within one turn.

[0056] Specifically, the 23rd turn of the second wire 60 has a first crossing portion 91 that crosses the 22nd turn of the first wire 50. Furthermore, the 23rd turn of the second wire 60 has a second crossing portion 92 that crosses the 23rd turn of the first wire 50. In this embodiment, as shown in FIG. 2 , the "crossing portion" refers to a portion where the center lines of the wires overlap when viewed in a direction perpendicular to the central axis X of the winding core 11.

[0057] 3, the first crossing point 91 is a point where, when the second wire 60 is traced from the first end 61 to the second end 62, the first wire 50 crosses over from the first flange 21 side to the second flange 31 side in the direction along the central axis X. Similarly, the second intersection point 82 is a point where the first wire 50 crosses over from the first flange 21 side to the second flange 31 side in the direction along the central axis X.

[0058] The 24.0 turn of the second wire 60 is located in the valley between the 24th turn of the first wire 50 and the 25th turn of the first wire 50. From the 24th turn of the second wire 60 to the middle of the 28th turn of the second wire 60, the I turn of the second wire 60 is located in the valley between the I turn of the first wire 50 and the (I+1) turn of the first wire 50.

[0059] In the middle of the 28th turn, the second wire 60 moves from the outer peripheral side of the first wire 50 onto the outer peripheral surface of the winding core 11. Specifically, as shown in Fig. 4, the second wire 60 moves onto the outer peripheral surface of the winding core 11 within a range of 28.0 turns or more and less than 28.5 turns.

[0060] 3, the fourth winding portion 74 is located on the second flange portion 31 side relative to the third winding portion 73 in the direction along the central axis X. The fourth winding portion 74 is a portion of the second wire 60, at least a portion of which is wound around the outer periphery of the winding core 11. Specifically, the fourth winding portion 74 extends from the middle of the 28th turn to the 30th turn of the second wire 60.

[0061] The 28th turn of the second wire 60 is wound directly around the outer circumferential surface of the winding core 11, between the 28th turn of the first wire 50 and the 29th turn of the first wire 50, at the ridge line on the upward Y1 side and the left Z2 side of the winding core 11. The 29.0 turn portion of the second wire 60 is wound directly around the outer circumferential surface of the winding core 11, between the 29.0 turn portion and the 30.0 turn portion of the first wire 50. The 29th turn of the second wire 60 is wound directly around the outer circumferential surface of the winding core 11, between the 29th turn of the first wire 50 and the 30th turn of the first wire 50, at the ridge line on the upward Y1 side and the left Z2 side of the winding core 11.

[0062] The second wire 60 intersects with the 29th turn of the first wire 50 at the 29th turn of the second wire 60. Specifically, the 29th turn of the second wire 60 has a third intersection point 83 at which it intersects with the 29th turn of the first wire 50. In other words, the turn immediately before the final turn of the second wire 60 has the third intersection point 83 at which it intersects with the turn immediately before the final turn of the first wire 50. In other words, the second wire 60 has the third intersection point 83 at which it intersects with the first wire 50 at a turn different from the turn having the first intersection point 81 and the turn having the second intersection point 82.

[0063] When the second wire 60 is traced from the first end 61 to the second end 62, the third intersection point 83 is a point where the second wire 60 crosses over the first wire 50 in the direction along the central axis X, from the second flange 31 side to the first flange 21 side. The third intersection point 83 is located on a surface facing the upward direction Y1 on the outer circumferential surface of the winding core 11. In other words, the third intersection point 83 is located on the upward Y1 side of the winding core 11 with respect to the central axis X.

[0064] The 30.0 turn portion of the second wire 60 is wound directly around the outer circumferential surface of the winding core 11 between the 29.0 turn portion and the 30.0 turn portion of the first wire 50. More specifically, the 30.0 turn portion of the second wire 60 is wound directly around the outer circumferential surface of the winding core 11 between the 29.0 turn portion of the second wire 60 and the 30.0 turn portion of the first wire 50. Furthermore, the portion of the 30th turn, which is the final turn of the second wire 60, that is wound directly around the outer circumferential surface of the winding core 11 is located between the 29th turn of the second wire 60 and the 30th turn of the first wire 50. Furthermore, the 30th turn, which is the final turn of the second wire 60, is located between the 29th turn of the first wire 50 and the 30th turn of the first wire 50.

[0065] <Regarding the location of intersections> Here, N is an integer equal to or greater than 3, and a specific turn of the first wire 50 is defined as the Nth turn of the first wire 50. As described above, the first intersection point 81 and the second intersection point 82 of the second wire 60 intersect the 15th turn of the first wire 50. The first intersection point 81 is the 15th turn, and the second intersection point 82 is the 16th turn. Therefore, when N is 15, the first intersection point 81 is the Nth turn of the second wire 60. The second intersection point 82 is the (N+1)th turn of the second wire 60.

[0066] Furthermore, the 23rd turn of the second wire 60 crosses over the first wire 50 from the first flange 21 side to the second flange 31 side in the direction along the central axis X at the first crossing point 91 and the second crossing point 92 when tracing the second wire 60 from the first end 61 to the second end 62. Therefore, in turns after the first intersection point 81 and the second intersection point 82, the second wire 60 has a portion where it crosses over the first wire 50 from the first flange 21 side to the second flange 31 side in the direction along the central axis X.

[0067] The final turn of the first wire 50 is the 30th turn. The first intersection point 81 and the second intersection point 82 of the second wire 60 intersect at the 15th turn of the first wire 50. Therefore, the final turn of the first wire 50 is the (2×N)th turn. Similarly, the final turn of the second wire 60 is the (2×N)th turn.

[0068] 3, the 15th turn of the second wire 60 is wound directly around the outer circumferential surface of the winding core 11 except for the vicinity of the first intersection point 81. As described above, the first intersection point 81 is located after approximately the 15.75th turn of the 15th turn. Therefore, the second wire 60 is wound around the outer circumferential surface of the winding core 11 for 0.5 turns or more, specifically 0.75 turns or more, in the turn including the first intersection point 81.

[0069] Furthermore, in the 16th turn of the second wire 60, the second wire 60 is wound directly around the outer peripheral surface of the winding core 11 except for the vicinity of the second intersection point 82. As described above, the second intersection point 82 is located after approximately the 16.75th turn of the 16th turn. Therefore, in the turn including the second intersection point 82, the second wire 60 is wound around the outer peripheral surface of the winding core 11 for 0.5 turns or more, specifically 0.75 turns or more.

[0070] As shown in FIG. 3, the winding core portion 11 is divided equally into three regions along the central axis X. The three regions are designated, in order from the first flange portion 21 side, as a first region P1, a second region P2, and a third region P3. In this case, the first intersection point 81 and the second intersection point 82 are located in the second region P2. That is, the first intersection point 81 and the second intersection point 82 are located in the second region P2, which is the center of the three regions. In FIG. 3, the boundaries between the first region P1, the second region P2, and the third region P3 are shown imaginarily by two-dot chain lines.

[0071] <Mode conversion characteristics> The Ssd12 was measured as an index of the mode conversion characteristics for the coil component 10 of the first embodiment and a coil component of a comparative example. The number of turns of each wire in the coil component of the comparative example is 30 turns, the same as that of the coil component 10 of the first embodiment. The coil component of the comparative example has a first winding portion, a second winding portion, a third winding portion, and a fourth winding portion. The coil component of the comparative example has a first intersection point but does not have a second intersection point. That is, the second winding portion in the coil component of the comparative example is a portion from the middle of the 14th turn to the middle of the 16th turn of the second wire. The third winding portion in the coil component of the comparative example is a portion from the middle of the 16th turn to the middle of the 28th turn of the second wire. The first winding portion and the fourth winding portion in the comparative example are wound in the same manner as the first winding portion 71 and the fourth winding portion 74 of the coil component 10 of the first embodiment, respectively. The materials of the drum core and the top plate in the coil device of the comparative example are the same as those in the coil device 10 of the first embodiment. That is, in the coil device 10 of the first embodiment, the length of the portion of the second wire 60 wound around the winding core 11 is longer than in the coil device of the comparative example by the amount that is wound directly around the outer circumferential surface of the winding core 11 at the second intersection point 82. In other words, the difference in length between the portions of the wires wound around the winding core 11 is shorter in the coil device 10 of the first embodiment than in the coil device of the comparative example.

[0072] In the measurements, the coil component 10 of the first embodiment and the coil component of the comparative example were each mounted on an Open Alliance-compliant 3-port board. After performing SOLT calibration on each coil component, SSD 12 of each coil component was measured. The measurement results obtained from each coil component, i.e., the average value of 20 measurement results, were used as the representative value of the measurement results.

[0073] In the coil device 10 of the first embodiment, Ssd12 was −82.2 dB when the measurement frequency was 1.6 MHz. In addition, in the coil device of the comparative example, Ssd12 was −84.7 dB when the measurement frequency was 1.6 MHz. In other words, it was found that the value of Ssd12 can be suppressed more effectively when the difference in the lengths of the portions of the wires wound around the winding core 11 is shorter.

[0074] <Effects of the First Embodiment> (1-1) According to the first embodiment, the second wire 60 has a first intersection point 81 and a second intersection point 82 that intersect with a specific turn of the first wire 50 within a range where the second wire 60 is wound two turns. In other words, the second wire 60 has a sufficient portion that is directly wound around the outer peripheral surface of the winding core 11. This configuration can reduce the difference between the length of the second wire 60 wound around the winding core 11 and the length of the first wire 50 wound around the winding core 11. Therefore, the above configuration can reduce the difference in DC resistance between the second wire 60 and the first wire 50. As a result, it is possible to prevent adverse effects on the characteristics required for a coil component. Specifically, the above configuration can reduce the value of Ssd12 by reducing the difference in DC resistance between the second wire 60 and the first wire 50.

[0075] (1-2) In the first embodiment, the second wire 60 is wound around the outer circumferential surface of the winding core 11 for 0.5 turns or more in the turn having the first intersection point 81. Furthermore, the second wire 60 is wound around the outer circumferential surface of the winding core 11 for 0.5 turns or more in the turn having the second intersection point 82. That is, the second wire 60 has a total of 1.0 turn or more in the portion of the second winding section 72 that is wound around the outer circumferential surface of the winding core 11 without the first wire 50 intervening. That is, with this configuration, the length of the second wire 60 wound around the winding core 11 and the length of the first wire 50 wound around the winding core 11 are sufficient. Furthermore, with this configuration, winding irregularities of the second wire 60 can be suppressed near the intersection points, compared to a configuration having only one of the first intersection point 81 and the second intersection point 82.

[0076] (1-3) In the first embodiment, suppose the second wire 60 is traced from the first end 61 to the second end 62. At this time, the first intersection point 81 and the second intersection point 82 are points where the second wire 60 crosses over the first wire 50 from the second flange 31 side to the first flange 21 side in the direction along the central axis X. Furthermore, in the first embodiment, the second wire 60 has a first crossing point 91 and a second crossing point 92. That is, when the second wire 60 is traced from the first end 61 to the second end 62 in a turn after the first intersection point 81 and the second intersection point 82, the second wire 60 crosses over the first wire 50 from the first flange 21 side to the second flange 31 side in the direction along the central axis X. According to this configuration, it is possible to balance the stray capacitances around the first intersection point 81 and the second intersection point 82 and around the first crossing point 91 and the second crossing point 92, thereby improving the electrical characteristics.

[0077] (1-4) In the first embodiment, the first intersection point 81 is the 15th turn of the second wire 60, and the second intersection point 82 is the 16th turn of the second wire 60. Furthermore, the first intersection point 81 and the second intersection point 82 intersect at the 15th turn of the first wire 50. That is, when a specific turn of the first wire 50 is the Nth turn of the first wire 50, the first intersection point 81 is the Nth turn of the second wire 60, and the second intersection point 82 is the (N+1)th turn of the second wire 60. With this configuration, the number of turns of the first wire 50 and the second wire 60 do not differ significantly at these intersection points. Therefore, stray capacitance at the first intersection point 81 and the second intersection point 82 can be suppressed.

[0078] (1-5) In the first embodiment, the first turn of the second wire 60 is located between the first turn of the first wire 50 and the second turn of the first wire 50. In other words, the second wire 60 is located at the second flange 31 with respect to the same turn of the first wire 50 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 first intersection point 81 and the second intersection point 82 straddle the first wire 50 from the second flange 31 side to the first flange 21 side in the direction along the central axis X. Therefore, in turns after the first intersection point 81 and the second intersection point 82, the second wire 60 is located at the first flange 21 with respect to the same turn of the first wire 50 in the direction along the central axis X. In this way, the direction of deviation of the second wire 60 relative to the first wire 50 is reversed before and after the first intersection point 81 and the second intersection point 82. As a result, for the coil device 10 as a whole, at least a portion of the stray capacitance in the turns before the first intersection point 81 and the second intersection point 82 can be canceled out by the stray capacitance in the turns after the first intersection point 81 and the second intersection point 82.

[0079] (1-6) In the first embodiment, the final turn of the first wire 50 is the 30th turn. The final turn of the second wire 60 is the 30th turn. That is, the second wire 60 intersects with the first wire 50 at the 15th turn, which includes the center of the second wire 60, among the turns wound around the winding core portion 11. In this way, by positioning the intersection point approximately in the center of the total turns, it is possible to reduce bias in stray capacitance when viewing the second wire 60 as a whole.

[0080] (1-7) In the first embodiment, when the winding core 11 is equally divided into three regions in the direction along the central axis X, the first intersection point 81 and the second intersection point 82 are located in the central second region P2. In this way, the intersection points are concentrated in the central part of the winding core 11, making the intersection points easy to visually identify. For example, when compared with a coil component that does not have an intersection point, the coil component 10 of the first embodiment can be identified by visually identifying the second region P2.

[0081] (Regarding the second embodiment) A second embodiment of the coil device will be described below. In the coil device 10 of the second embodiment, the drum core 10C, the planar core 10F, and the first external electrode 41 to the fourth external electrode 44 are configured similarly to those of the first embodiment. The following describes the winding mode of the first wire 50 and the second wire 60, which is different from that of the first embodiment.

[0082] <Regarding the winding of the first wire and the second wire> 5, in the second embodiment, the final turn of the first wire 50 is 30 turns. In the second embodiment, the final turn of the second wire 60 is 30 turns.

[0083] The first wire 50 is wound directly around the outer peripheral surface of the winding core 11 over the entire circumference without using the second wire 60. From the first turn to partway through the 15th turn of the first wire 50, the individual turns are in contact with each other in the direction along the central axis X. On the other hand, the 15.0 turn and the 16.0 turn of the first wire 50 are separated in the direction along the central axis X. Then, from the 17th turn to the 28th turn of the first wire 50, the individual turns are in contact with each other in the direction along the central axis X.

[0084] Furthermore, the 28.0 turn location of the first wire 50 and the 29.0 turn location of the first wire 50 are in contact with each other in the direction along the central axis X. On the other hand, at the ridge line on the upward Y1 side and leftward Z2 side of the winding core portion 11, the 28th turn and the 29th turn of the first wire 50 are spaced apart in the direction along the central axis X. Furthermore, the 30th turn of the first wire 50 is spaced apart from the 29th turn of the first wire 50 in the direction along the central axis X.

[0085] The second wire 60 includes a first winding portion 71, a second winding portion 72, a third winding portion 73, and a fourth winding portion 74. The first winding portion 71 is a portion of the second wire 60 that is wound around the outer circumferential surface of the first wire 50 over multiple turns. In the second embodiment, the first winding portion 71 is a portion from the first turn to the middle of the 14th turn of the second wire 60. In other words, the first winding portion 71 is a portion of the second wire 60 that extends from the point where the second wire 60 rides up onto the outer circumferential side of the first wire 50 to the point immediately before it is directly wound around the outer circumferential surface of the winding core 11.

[0086] Here, I is a positive integer. A groove formed between two adjacent turns of wire is defined as a valley of the wire. In this case, in the first winding portion 71, the I-th turn of the second wire 60 is located between the I-th turn of the first wire 50 and the (I+1)-th turn of the first wire 50. Specifically, for example, the first turn of the second wire 60 is located in the valley between the I-th turn of the first wire 50 and the second turn of the first wire 50.

[0087] In the middle of the 14th turn, the second wire 60 moves from the outer circumferential side of the first wire 50 onto the outer circumferential surface of the winding core 11. Specifically, as shown in Fig. 6 , the second wire 60 moves onto the outer circumferential surface of the winding core 11 within a range of 14.0 turns or more and less than 14.5 turns.

[0088] 5, the second winding portion 72 is located on the second flange 31 side relative to the first winding portion 71 in the direction along the central axis X. The second winding portion 72 is a portion of the second wire 60, at least a portion of which is wound around the outer periphery of the winding core 11. Specifically, the second winding portion 72 is a portion of the second wire 60 from the middle of the 14th turn to the middle of the 17th turn.

[0089] The 14th turn of the second wire 60 is wound directly around the outer circumferential surface of the winding core 11, at the ridge line on the upward Y1 side and leftward Z2 side of the winding core 11, between the 15th turn of the second wire 60 and the 16th turn of the first wire 50. The 15.0 turn and 16.0 turn portions of the second wire 60 are wound directly around the outer circumferential surface of the winding core 11, between the 15.0 turn and 16.0 turn portions of the first wire 50.

[0090] The second wire 60 intersects with the 15th turn of the first wire 50 at the 14th and 15th turns of the second wire 60. The term "intersect" here is treated the same as "intersect" in the first embodiment.

[0091] Specifically, the 14th turn of the second wire 60 has a first intersection point 81 where it intersects with the 15th turn of the first wire 50. Also, the 15th turn of the second wire 60 has a second intersection point 82 where it intersects with the 15th turn of the first wire 50.

[0092] That is, in the second winding portion 72, when the second wire 60 is traced from the first end 61 to the second end 62, the second wire 60 has a first intersection point 81 and a second intersection point 82 that intersect with a specific turn of the first wire 50 within the range of two turns of winding. Note that in this embodiment as well, the point where the center lines of the wires overlap when viewed in a direction perpendicular to the central axis X of the winding core portion 11 is referred to as the "intersection point."

[0093] The first intersection 81 is a point where, when the second wire 60 is traced from the first end 61 to the second end 62, the second wire 60 crosses over the first wire 50 from the second flange 31 side to the first flange 21 side in the direction along the central axis X. Similarly, the second intersection 82 is a point where the first wire 50 crosses over the first wire 50 from the second flange 31 side to the first flange 21 side in the direction along the central axis X.

[0094] The first intersection point 81 and the second intersection point 82 are located on the outer peripheral surface of the winding core 11 facing the upward direction Y1. In other words, the first intersection point 81 and the second intersection point 82 are located on the outer peripheral surface of the winding core 11 on the upward direction Y1 side with respect to the central axis X. Therefore, the first intersection point 81 is located after approximately 14.75 turns of the 14th turn. Similarly, the second intersection point 82 is located after approximately 15.75 turns of the 15th turn.

[0095] The 17.0 turn portion of the second wire 60 is wound directly on the outer peripheral surface of the winding core 11 between the 16.0 turn portion and the 17.0 turn portion of the first wire 50. The second wire 60 runs from the outer peripheral surface of the winding core 11 onto the outer peripheral side of the first wire 50 midway through the 17th turn. Specifically, as shown in FIG. 6 , the second wire 60 runs onto the outer peripheral side of the first wire 50 within a range of 17.0 turns or more and less than 17.5 turns. Note that, as shown in FIG. 5 , the portion of the 17th turn of the second wire 60 where it runs onto the outer peripheral side of the first wire 50 is the valley between the 16th turn of the first wire 50 and the 16th turn of the second wire 60.

[0096] The third winding portion 73 in the second embodiment has the same configuration as the third winding portion 73 in the first embodiment. That is, the 23rd turn of the second wire 60 has a first crossing portion 91 that crosses the 22nd turn of the first wire 50. In addition, the 23rd turn of the second wire 60 has a second crossing portion 92 that crosses the 23rd turn of the first wire 50.

[0097] The fourth winding portion 74 in the second embodiment has the same configuration as the fourth winding portion 74 in the first embodiment. That is, the 29th turn of the second wire 60 has a third intersection point 83 that intersects with the 29th turn of the first wire 50. The third intersection point 83 is a point where the turn immediately before the final turn of the second wire 60 intersects with the turn immediately before the final turn of the first wire 50. In addition, the portion of the 30th turn, which is the final turn of the second wire 60, that is wound directly around the outer circumferential surface of the winding core 11 is located between the 29th turn of the second wire 60 and the 30th turn of the first wire 50. In addition, the 30th turn, which is the final turn of the second wire 60, is located between the 29th turn, which is the turn immediately before the final turn, and the 30th turn, which is the final turn of the first wire 50.

[0098] <Regarding the location of intersections> Here, N is an integer equal to or greater than 3, and a specific turn of the first wire 50 is defined as the Nth turn of the first wire 50. As described above, the first intersection point 81 and the second intersection point 82 of the second wire 60 intersect the 15th turn of the first wire 50. The first intersection point 81 is the 14th turn, and the second intersection point 82 is the 15th turn. Therefore, when N is 15, the first intersection point 81 is the (N-1)th turn of the second wire 60. The second intersection point 82 is the Nth turn of the second wire 60.

[0099] Furthermore, the 23rd turn of the second wire 60 crosses over the first wire 50 from the first flange 21 side to the second flange 31 side in the direction along the central axis X at the first crossing point 91 and the second crossing point 92 when tracing the second wire 60 from the first end 61 to the second end 62. Therefore, in turns after the first intersection point 81 and the second intersection point 82, the second wire 60 has a portion where it crosses over the first wire 50 from the first flange 21 side to the second flange 31 side in the direction along the central axis X.

[0100] The final turn of the first wire 50 is the 30th turn. The first intersection point 81 and the second intersection point 82 of the second wire 60 intersect at the 15th turn of the first wire 50. Therefore, the final turn of the first wire 50 is the (2×N)th turn. Similarly, the final turn of the second wire 60 is the (2×N)th turn.

[0101] As described above, the turn immediately preceding the final turn of the second wire 60 has the third intersection point 83 at which it intersects with the turn immediately preceding the final turn of the first wire 50. That is, in the second embodiment, the turn immediately preceding the (2×N) turn of the second wire 60 has the third intersection point 83 at which it intersects with the turn immediately preceding the (2×N) turn of the first wire 50.

[0102] Furthermore, in the 14th turn of the second wire 60, the second wire 60 is wound directly around the outer circumferential surface of the winding core 11 except for the vicinity of the first intersection point 81 and the vicinity of the 14.0 turn. As described above, the first intersection point 81 is located after the 14.75 turn of the 14th turn. Therefore, in the turn including the first intersection point 81, 0.5 turns or more of the second wire 60 are wound around the outer circumferential surface of the winding core 11.

[0103] Furthermore, in the 15th turn of the second wire 60, the second wire 60 is wound directly around the outer circumferential surface of the winding core 11 except for the vicinity of the second intersection point 82. As described above, the second intersection point 82 is located after approximately the 15.75th turn of the 15th turn. Therefore, in the turn including the second intersection point 82, 0.5 turns or more of the second wire 60 are wound around the outer circumferential surface of the winding core 11.

[0104] As shown in FIG. 5, the winding core portion 11 is divided equally into three regions along the central axis X. The three regions are designated, in order from the first flange portion 21 side, as a first region P1, a second region P2, and a third region P3. In this case, the first intersection point 81 and the second intersection point 82 are located in the second region P2. That is, the first intersection point 81 and the second intersection point 82 are located in the second region P2, which is the center of the three regions. Note that in FIG. 5, the boundaries between the first region P1, the second region P2, and the third region P3 are shown imaginary by two-dot chain lines.

[0105] <Effects of the second embodiment> In the second embodiment, in addition to the effects (1-1) to (1-3) and (1-5) to (1-7) of the first embodiment, the following effects can be obtained.

[0106] (2-1) In the second embodiment, the first intersection point 81 is the 14th turn of the second wire 60, and the second intersection point 82 is the 15th turn of the second wire 60. Furthermore, the first intersection point 81 and the second intersection point 82 intersect at the 15th turn of the first wire 50. That is, when a specific turn of the first wire 50 is the Nth turn of the first wire 50, the first intersection point 81 is the (N-1)th turn of the second wire 60, and the second intersection point 82 is the Nth turn of the second wire 60. With this configuration, the number of turns of the first wire 50 and the second wire 60 do not differ significantly at these intersection points. Therefore, stray capacitance at the first intersection point 81 and the second intersection point 82 can be suppressed.

[0107] (2-2) In the second embodiment, the third intersection point 83 is a point where the turn immediately before the (2×N) turn of the second wire 60 intersects with the turn immediately before the (2×N) turn of the first wire 50. That is, the third intersection point 83 is located closer to the second flange 31 than the first intersection point 81 and the second intersection point 82. Also, the first intersection point 81 is located closer to the first flange 21 than the 15th turn, which includes the center of the second wire. The third intersection point 83 is located closer to the second flange 31 than the 15th turn, which includes the center of the second wire 60. Therefore, with the above configuration, it is possible to suppress bias in the stray capacitance of the coil device 10 when viewed as a whole.

[0108] (Regarding the third embodiment) A third embodiment of the coil device will be described below. In the coil device 10 of the third embodiment, the configurations of the drum core 10C, the planar core 10F, and the first external electrode 41 to the fourth external electrode 44 are the same as those of the first embodiment. The following describes the winding mode of the first wire 50 and the second wire 60, which is different from the first and second embodiments.

[0109] <Regarding the winding of the first wire and the second wire> 7, in the third embodiment, the final turn of the first wire 50 is 28 turns. In the third embodiment, the final turn of the second wire 60 is 28 turns.

[0110] The first wire 50 is wound directly around the outer peripheral surface of the winding core 11 over the entire circumference without using the second wire 60. From the first turn to partway through the 15th turn of the first wire 50, the individual turns are in contact with each other in the direction along the central axis X. On the other hand, the 15.0 turn and the 16.0 turn of the first wire 50 are separated in the direction along the central axis X. Then, from the 17th turn to the 28th turn of the first wire 50, the individual turns are in contact with each other in the direction along the central axis X.

[0111] The second wire 60 includes a first winding portion 71, a second winding portion 72, and a third winding portion 73. The first winding portion 71 is a portion of the second wire 60 that is wound around the outer circumferential surface of the first wire 50 over multiple turns. In the third embodiment, the first winding portion 71 is a portion from the second turn to the middle of the 14th turn of the second wire 60. In other words, the first winding portion 71 is a portion of the second wire 60 that extends from the point where the second wire 60 rides up onto the outer circumferential side of the first wire 50 to the point immediately before it is directly wound around the outer circumferential surface of the winding core 11.

[0112] Here, I is a positive integer. A groove formed between two adjacent turns of wire is defined as a valley of the wire. In this case, in the first winding portion 71, the I-th turn of the second wire 60 is located between the (I-1)-th turn of the first wire 50 and the I-th turn of the first wire 50. Specifically, for example, the second turn of the second wire 60 is located in the valley between the first turn of the first wire 50 and the second turn of the first wire 50.

[0113] In the middle of the 14th turn, the second wire 60 moves from the outer circumferential side of the first wire 50 to the outer circumferential surface of the winding core 11. Specifically, the second wire 60 moves toward the outer circumferential side of the winding core 11 within a range of 14.0 turns or more and less than 14.5 turns.

[0114] Furthermore, when tracing the second wire 60 from the first end 61 to the second end 62, the 14th turn of the second wire 60 straddles the 14th turn of the first wire 50 on the surface of the winding core 11 facing the downward direction Y2, from the first flange 21 side to the second flange 31 side.

[0115] The second winding portion 72 is located on the second flange 31 side relative to the first winding portion 71 in the direction along the central axis X. The second winding portion 72 is a portion of the second wire 60, at least a portion of which is wound around the outer periphery of the winding core 11. Specifically, the second winding portion 72 extends from the middle of the 14th turn to the middle of the 16th turn of the second wire 60.

[0116] The 14th turn of the second wire 60 is wound directly around the outer circumferential surface of the winding core 11, at the ridge line on the upward Y1 side and leftward Z2 side of the winding core 11, between the 15th turn of the first wire 50 and the 16th turn of the first wire 50. The 15.0 turn and 16.0 turn portions of the second wire 60 are wound directly around the outer circumferential surface of the winding core 11, between the 15.0 turn and 16.0 turn portions of the first wire 50.

[0117] The second wire 60 intersects with the 15th turn of the first wire 50 at the 14th and 15th turns of the second wire 60. The term "intersect" here is treated the same as "intersect" in the first embodiment.

[0118] Specifically, the 14th turn of the second wire 60 has a first intersection point 81 where it intersects with the 15th turn of the first wire 50. Also, the 15th turn of the second wire 60 has a second intersection point 82 where it intersects with the 15th turn of the first wire 50.

[0119] That is, in the second winding portion 72, when the second wire 60 is traced from the first end 61 to the second end 62, the second wire 60 has a first intersection point 81 and a second intersection point 82 that intersect with a specific turn of the first wire 50 within the range of two turns of winding. Note that in this embodiment as well, the point where the center lines of the wires overlap when viewed in a direction perpendicular to the central axis X of the winding core portion 11 is referred to as the "intersection point."

[0120] The first intersection 81 is a point where, when the second wire 60 is traced from the first end 61 to the second end 62, the second wire 60 crosses over the first wire 50 from the second flange 31 side to the first flange 21 side in the direction along the central axis X. Similarly, the second intersection 82 is a point where the first wire 50 crosses over the first wire 50 from the second flange 31 side to the first flange 21 side in the direction along the central axis X.

[0121] The first intersection point 81 and the second intersection point 82 are located on the outer peripheral surface of the winding core 11 facing the upward direction Y1. In other words, the first intersection point 81 and the second intersection point 82 are located on the outer peripheral surface of the winding core 11 on the upward direction Y1 side with respect to the central axis X. That is, the first intersection point 81 is located after approximately 14.75 turns of the 14th turn. Similarly, the second intersection point 82 is located after approximately 15.75 turns of the 15th turn.

[0122] Partway through the 16th turn, the second wire 60 runs from the outer circumferential surface of the winding core 11 onto the outer circumferential side of the first wire 50. Specifically, as shown in Fig. 8 , the second wire 60 runs onto the outer circumferential side of the winding core 11 within the range of 16.0 turns or more and less than 16.5 turns.

[0123] Also, as shown in Figure 7, when the second wire 60 is traced from the first end 61 to the second end 62, the 16th turn of the second wire 60 straddles the 16th turn of the first wire 50 from the first flange portion 21 side to the second flange portion 31 side on the surface of the winding core portion 11 facing the downward direction Y2.

[0124] The third winding portion 73 is located on the second flange 31 side relative to the second winding portion 72 in the direction along the central axis X. The third winding portion 73 is a portion of the second wire 60 that is wound outer circumferentially around the first wire 50 over a plurality of turns. In the third embodiment, the third winding portion 73 is a portion of the second wire 60 that extends from the middle of the 16th turn to the 27th turn. In other words, the third winding portion 73 is a portion of the second wire 60 that extends from the point where the second wire 60 rides up onto the outer circumferential side of the first wire 50 to the point immediately before it is directly wound around the outer circumferential surface of the winding core 11.

[0125] The 16th turn of the second wire 60 is located in a valley between the 16th turn of the first wire 50 and the 17th turn of the first wire 50, on the ridge line on the upward Y1 side and leftward Z2 side of the winding core 11. From the 17th turn of the second wire 60 to the 27th turn of the second wire 60, the I-th turn of the second wire 60 is located in a valley between the I-th turn of the first wire 50 and the (I+1)-th turn of the first wire 50.

[0126] The second wire 60 also has a fourth winding portion 74 and a fifth winding portion 75 . The fourth winding portion 74 is located closer to the first flange 21 than the first winding portion 71 in the direction along the central axis X. The fourth winding portion 74 is the first turn of the second wire 60. The first turn of the second wire 60 is located closer to the first flange 21 than the first turn of the first wire 50 in the direction along the central axis X.

[0127] The fifth winding portion 75 is located closer to the second flange 31 than the third winding portion 73 in the direction along the central axis X. The fifth winding portion 75 is the 28th turn of the second wire 60. The 28th turn of the second wire 60 is located closer to the second flange 31 than the 28th turn of the first wire 50 in the direction along the central axis X.

[0128] <Regarding the location of intersections> Here, N is an integer equal to or greater than 3, and a specific turn of the first wire 50 is defined as the Nth turn of the first wire 50. As described above, the first intersection point 81 and the second intersection point 82 of the second wire 60 intersect the 15th turn of the first wire 50. The first intersection point 81 is the 14th turn, and the second intersection point 82 is the 15th turn. Therefore, when N is 15, the first intersection point 81 is the (N-1)th turn of the second wire 60. The second intersection point 82 is the Nth turn of the second wire 60.

[0129] As described above, in the first winding portion 71, the I-th turn of the second wire 60 is located in a valley between the (I-1)-th turn of the first wire 50 and the I-th turn of the first wire 50. Specifically, the 13th turn of the second wire 60 is located in a valley between the 12th turn and the 13th turn of the first wire 50. In other words, the (N-2)-th turn of the second wire 60 is wound on the outer peripheral side of the first wire 50 between the (N-3)-th turn and the (N-2)-th turn of the first wire 50.

[0130] Furthermore, as described above, from the 17th turn to the 27th turn of the second wire 60, the I-th turn of the second wire 60 is located in the valley between the I-th turn of the first wire 50 and the (I+1)-th turn of the first wire 50. That is, the 17th turn of the second wire 60 is located in the valley between the 17th and 18th turns of the first wire 50. In other words, the (N+2)-th turn of the second wire 60 is wound radially outward of the first wire 50 between the (N+2)-th and (N+3)-th turns of the first wire 50.

[0131] The final 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 final turn of the first wire 50. Furthermore, in the 14th turn of the second wire 60, the second wire 60 is wound directly around the outer circumferential surface of the winding core 11 except for the vicinity of the first intersection point 81 and the vicinity of the 14.0 turn. As described above, the first intersection point 81 is located after the 14.75 turn of the 14th turn. Therefore, in the turn including the first intersection point 81, 0.5 turns or more of the second wire 60 are wound around the outer circumferential surface of the winding core 11.

[0132] Furthermore, in the 15th turn of the second wire 60, the second wire 60 is wound directly around the outer circumferential surface of the winding core 11 except for the vicinity of the second intersection point 82. As described above, the second intersection point 82 is located after approximately the 15.75th turn of the 15th turn. Therefore, in the turn including the second intersection point 82, 0.5 turns or more of the second wire 60 are wound around the outer circumferential surface of the winding core 11.

[0133] As shown in FIG. 7, the winding core portion 11 is divided equally into three regions along the central axis X. The three regions are designated, in order from the first flange portion 21 side, as a first region P1, a second region P2, and a third region P3. In this case, the first intersection point 81 and the second intersection point 82 are located in the second region P2. That is, the first intersection point 81 and the second intersection point 82 are located in the second region P2, which is the center of the three regions. In FIG. 7, the boundaries between the first region P1, the second region P2, and the third region P3 are shown imaginarily by two-dot chain lines.

[0134] <Effects of the third embodiment> In the third embodiment, in addition to the effects (1-1), (1-2), (1-5), and (1-6) of the first embodiment and the effect (2-1) of the second embodiment, the following effect can be obtained.

[0135] (3-1) In the third embodiment, the (N-2)th turn of the second wire 60 is wound radially outward of the first wire 50 between the (N-3)th and (N-2)th turns of the first wire 50. The (N+2)th turn of the second wire 60 is wound radially outward of the first wire 50 between the (N+2)th and (N+3)th turns of the first wire 50. This configuration can reduce stray capacitance generated between different turns of each wire.

[0136] Furthermore, in the third embodiment, in the first winding portion 71, the I-th turn of the second wire 60 is located in a valley between the (I-1)-th turn of the first wire 50 and the I-th turn of the first wire 50. Furthermore, in the third winding portion 73, the I-th turn of the second wire 60 is located in a valley between the I-th turn and the (I+1)-th turn of the first wire 50. With this configuration, stray capacitance can be suppressed by consecutive turns in the first winding portion 71 and the third winding portion 73.

[0137] (3-2) In the coil device 10, the final turn of each wire is pulled toward the second flange 31 to be joined to the respective external electrodes. Therefore, the final turn of each wire is pulled in the direction toward the second flange 31. This may cause the vicinity of the final turn of each wire to be misaligned in the direction toward the second flange 31. In particular, if the first wire 50 is misaligned in the direction toward the second flange 31, the second wire 60 wound around the outer periphery of the first wire 50 may also be misaligned, which may cause the overall winding of the wire to become disordered.

[0138] In the third embodiment, the final turn of the second wire 60 is located closer to the second flange 31 in the direction along the central axis X than the final turn of the first wire 50. With this positional relationship, even if the final turn of the first wire 50 is pulled toward the second flange 31, the movement of the first wire 50 in the pulling direction is restricted by the final turn of the second wire 60. Therefore, with this configuration, the overall winding disorder of the wire as described above can be suppressed.

[0139] <Example of change> The above-described embodiments can be modified as follows: The above-described first, second, and third embodiments and the following modifications can be combined and implemented within the scope of technical compatibility.

[0140] In the first, second, and third 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.

[0141] In the first, second, and third embodiments, the shape of the winding core 11 is not limited to the examples of 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.

[0142] In the first, second, and third 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. Furthermore, the materials of the drum core 10C and the planar core 10F may be ferrite, alumina, synthetic resin, or a mixture thereof.

[0143] In the first, second, and third embodiments, the configuration of the drum core 10C is not limited to the examples of the above embodiments. For example, the first flange 21 may not have the protrusion 23. Also, for example, the first flange 21 may have a recess in the center along the left-right axis Z, giving it a bifurcated shape. The same applies to the second flange 31.

[0144] In the first, second, and third embodiments, the method of joining the wires to the joints EP of the external electrodes is not limited to thermocompression bonding. For example, the ends of the wires may be joined to the joints EP with a laser, or by other methods.

[0145] In the first, second, and third embodiments, the material and shape of each external electrode are not limited to those of the above embodiments. Each external electrode may be made of any material as long as it can be joined to the first wire 50 and the second wire 60. For example, the external electrode may have a metal layer and a plating layer, with the wires connected to the plating layer. Furthermore, for example, each external electrode may not have an adhesive portion AP or a connecting portion BP. In this case, the external electrode may be fixed to the corresponding flange portion by a joining portion EP, a mounting portion CP, an extension portion DP, or a combination of these.

[0146] In the first, second, and third embodiments, the external electrodes are not limited to plate-shaped ones. For example, the external electrodes may be coated electrodes obtained by applying an electrode paste to the first flange 21 or the second flange 31, baking the electrode paste, and plating the electrode paste.

[0147] In the first, second and third embodiments, the value of N is not limited to 15. The value of N may be any integer equal to or greater than 3. In the first, second, and third embodiments, the first intersection point 81 and the second intersection point 82 do not have to be located in the second region P2. Also, the first intersection point 81 and the second intersection point 82 do not have to be located in the same region.

[0148] In the first embodiment, the first intersection point 81 is not limited to the intersection point between the 15th turn of the first wire 50 and the 15th turn of the second wire 60. For example, the first intersection point 81 may be the intersection point between the 14th turn of the first wire 50 and the 16th turn of the second wire 60. In this way, the second wire 60 at the first intersection point 81 may be a turn that is two or more turns away from the Nth turn of the first wire 50. This also applies to the second and third embodiments.

[0149] In the first and second embodiments, the second wire 60 does not have to intersect with the first wire 50 at the center turn among the turns wound around the winding core 11. That is, when the first intersection point 81 is the Nth turn of the second wire 60, the final turn of the second wire 60 does not have to be the (2×N)th turn. This also applies to the first wire 50. Furthermore, when the second intersection point 82 is the Nth turn of the second wire 60, the final turn of the second wire 60 does not have to be the (2×N)th turn.

[0150] In the first and second embodiments, the first turn of the second wire 60 may be wound directly around the outer circumferential surface of the winding core 11 without using the first wire 50. In other words, the first turn of the second wire 60 does not have to be located on a valley formed by two adjacent turns of the first wire 50.

[0151] In the first and second embodiments, the first turn of the second wire 60 does not have to be located between the first turn of the first wire 50 and the second turn of the first wire 50. In the third embodiment, the first turn of the second wire 60 does not have to be located on the first flange portion 21 side of the first turn of the first wire 50 in the direction along the central axis X.

[0152] In the first and second embodiments, the final turn of the second wire 60 does not have to be located closer to the first flange 21 than the final turn of the first wire 50 in the direction along the central axis X. In addition, in the third embodiment, the final turn of the second wire 60 does not have to be located closer to the second flange 31 than the final turn of the first wire 50 in the direction along the central axis X.

[0153] In the first and second embodiments, the first crossing location 91 and the second crossing location 92 do not have to be located on the second flange 31 side with respect to the second intersection location 82 in the direction along the central axis X when tracing the second wire 60 from the first end 61 to the second end 62. That is, the second wire 60 may have a location where it crosses over the first wire 50 from the first flange 21 side to the second flange 31 side in the direction along the central axis X in a turn before the first intersection location 81 and the second intersection location 82 when tracing the second wire 60 from the first end 61 to the second end 62. Furthermore, in the first and second embodiments, the first crossing location 91 and the second crossing location 92 may be located on different turns of the second wire 60.

[0154] In the first, second, and third embodiments, the first intersection point 81 and the second intersection point 82 may straddle the first wire 50 from the first flange 21 side to the second flange 31 side in the direction along the central axis X when tracing the second wire 60 from the first end 61 to the second end 62.

[0155] In the first, second, and third embodiments, the second wire 60 may be wound around the outer peripheral surface of the winding core 11 by less than 0.5 turns in a turn having the first intersection point 81. Also, the second wire 60 may be wound around the outer peripheral surface of the winding core 11 by less than 0.5 turns in a turn having the second intersection point 82. In each embodiment, when the second wire 60 is traced from the first end to the second end in the second winding section 72, it is sufficient that the second wire 60 has the first intersection point 81 and the second intersection point 82 within a range of two turns.

[0156] In the first and second embodiments, the third intersection point 83 does not have to be located on the second flange 31 side of the second intersection point 82 in the direction along the central axis X when the second wire 60 is traced from the first end 61 to the second end 62. In other words, in a turn before the first intersection point 81 and the second intersection point 82, the second wire 60 may have a portion where it straddles the first wire 50 from the first flange 21 side to the second flange 31 side in the direction along the central axis X when the second wire 60 is traced from the first end 61 to the second end 62.

[0157] In the first and second embodiments, the third intersection point 83 may be located on a different turn of the second wire 60. For example, the third intersection point 83 may be a point where the (2×N) turns of the second wire 60 intersect with the (2×N) turns of the first wire 50.

[0158] In the first and second embodiments, the third intersection point 83 does not have to be located on the upward direction Y1 side of the winding core 11 with respect to the central axis X. As a result, the third intersection point 83 may be located on the outer circumferential surface of the winding core 11 in a direction different from the direction in which the external electrodes are located at each flange.

[0159] In the first and second embodiments, the second wire 60 may not have the first crossing point 91, the second intersection point 82, and the third intersection point 83. Furthermore, in the third embodiment, the 14th turn of the second wire 60 may not cross over the 14th turn of the first wire 50. Furthermore, in the third embodiment, the 16th turn of the second wire 60 may not cross over the 16th turn of the first wire 50. That is, in each embodiment, as long as the second wire 60 has the first intersection point 81 and the second intersection point 82, the winding manner of each wire can be changed as appropriate. For example, in the first, second, and third embodiments, the second wire 60 may further have an intersection point and a crossing point.

[0160] Furthermore, for example, in the third embodiment, the (N-2)th turn of the second wire 60 does not have to be wound on the outer circumferential side of the first wire 50 between the (N-3)th turn of the first wire 50 and the (N-2)th turn of the first wire 50. Furthermore, the (N+2)th turn of the second wire 60 does not have to be wound on the outer circumferential side of the first wire 50 between the (N+2)th turn and the (N+3)th turn of the first wire 50.

[0161] <Additional Notes> The technical concepts that can be derived from the above-described embodiments and modifications will be described below. [1] A drum core having a columnar winding core, a first flange provided at a first end in a direction along the central axis of the winding core, and 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 second wire is wound around the first wire over a plurality of turns. a first winding portion wound around the outer periphery of the first wire; a second winding portion located on the second flange side of the first winding portion in a direction along the central axis and at least a portion of which is wound around the outer periphery of the winding core; and a third winding portion located on the second flange side of the second winding portion in a direction along the central axis and wound around the outer periphery of the first wire over a plurality of turns, wherein when the second wire is traced from the first end to the second end in the second winding portion, the second wire has a first intersection point and a second intersection point where the second wire intersects with a specific turn of the first wire within a range of two turns.

[0162] [2] The coil component according to [1], wherein the second wire is wound around the outer peripheral surface of the winding core portion for 0.5 turns or more in the turn having the first intersection, and the second wire is wound around the outer peripheral surface of the winding core portion for 0.5 turns or more in the turn having the second intersection.

[0163] [3] The coil component according to [1] or [2], wherein the first intersection point and the second intersection point are points where the second wire crosses over the first wire from the second flange side to the first flange side in the direction along the central axis when the second wire is traced from the first end to the second end, and the second wire has a point where the second wire crosses over the first wire from the first flange side to the second flange side in the direction along the central axis in a turn after the first intersection point and the second intersection point when the second wire is traced from the first end to the second end.

[0164] [4] A coil component according to any one of [1] to [3], wherein when N is an integer of 3 or more and a specific turn of the first wire is the Nth turn of the first wire, the first intersection point is the Nth turn of the second wire, and the second intersection point is the (N+1)th turn of the second wire.

[0165] [5] A coil component according to any one of [1] to [3], wherein when N is an integer of 3 or more and a specific turn of the first wire is the Nth turn of the first wire, the first intersection point is the (N-1)th turn of the second wire, and the second intersection point is the Nth turn of the second wire.

[0166] [6] The coil component according to any one of [1] to [5], wherein the first turn of the second wire is located between the first turn of the first wire and the second turn of the first wire. [7] A coil component according to any one of [1] to [6], wherein the final turn of the second wire is located closer to the second flange portion in the direction along the central axis than the final turn of the first wire.

[0167] [8] The coil component according to [4] or [5], wherein the final turn of the first wire is the (2×N)th turn, and the final turn of the second wire is the (2×N)th turn.

[0168] [9] A coil component according to [5], wherein the (N-2)th turn of the second wire is wound around the outer periphery of the first wire between the (N-3)th turn and the (N-2)th turn of the first wire, and the (N+2)th turn of the second wire is wound around the outer periphery of the first wire between the (N+2)th turn and the (N+3)th turn of the first wire.

[0169]

[10] A coil component as described in [8], wherein the turn immediately before the (2×N) turn of the second wire has a third intersection point where it intersects with the turn immediately before the (2×N) turn of the first wire.

[0170]

[11] The coil component according to [8], wherein the (2×N) turns of the second wire have a third intersection point where the (2×N) turns of the first wire intersect.

[12] The coil component according to any one of [1] to

[11] , wherein the second wire has a third intersection point that intersects with the first wire in a turn different from the turn having the first intersection point and the turn having the second intersection point, and when a specific axis perpendicular to the central axis is defined as a vertical axis and one of the directions along the vertical axis is defined as an upward direction, the first external electrode and the second external electrode are located on the upward side of the first flange portion with respect to the central axis, the third external electrode and the fourth external electrode are located on the upward side of the second flange portion with respect to the central axis, and the third intersection point is located on the upward side of the winding core portion with respect to the central axis.

[0171]

[13] The coil component according to any one of [1] to

[12] , wherein when the winding core portion is equally divided into three regions in a direction along the central axis, the first intersection point and the second intersection point are located in the central region. [Explanation of symbols]

[0172] 10...Coil parts 10C...Drum core 11...Core 21...First flange 31...Second flange 10F...Plate Core 41...First external electrode 42…Second external electrode 43…Third external electrode 44...Fourth external electrode 50...First wire 60...Second wire 71...Volume 1 72...Second volume 73...Volume 3 81...First intersection 82...Second intersection

Claims

1. a drum core having a columnar winding core, a first flange provided at a first end of the winding core in a direction along a central axis thereof, and a second flange provided at a second end of the winding core 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 The second wire is a first winding portion wound around the first wire on the outer circumferential side over a plurality of turns; a second winding portion located on the second flange side relative to the first winding portion in a direction along the central axis, at least a portion of which is wound around an outer peripheral surface of the winding core; a third winding portion located on the second flange side relative to the second winding portion in a direction along the central axis and wound around the first wire on an outer circumferential side thereof through a plurality of turns; Equipped with When the second wire is traced from the first end to the second end in the second winding portion, the second wire has a first intersection point and a second intersection point that intersect with a specific turn of the first wire within a range of two turns of winding. Coil parts.

2. The second wire is wound around the outer circumferential surface of the winding core part by 0.5 turns or more in the turn having the first intersection part, and is wound around the outer circumferential surface of the winding core part by 0.5 turns or more in the turn having the second intersection part. The coil component according to claim 1 .

3. the first intersection point and the second intersection point are points at which the second wire crosses over the first wire from the second flange side to the first flange side in a direction along the central axis when the second wire is traced from the first end to the second end, The second wire has a portion where it crosses over the first wire from the first flange side to the second flange side in a direction along the central axis when tracing the second wire from the first end to the second end in the first intersection point and the turn after the second intersection point. The coil component according to claim 1 .

4. When N is an integer of 3 or more and a specific turn of the first wire is the N-th turn of the first wire, the first intersection point is the Nth turn of the second wire, The second intersection point is the (N+1)th turn of the second wire. The coil component according to claim 1 .

5. When N is an integer of 3 or more and a specific turn of the first wire is the N-th turn of the first wire, the first intersection point is the (N-1)th turn of the second wire, The second intersection point is the Nth turn of the second wire. The coil component according to claim 1 .

6. The first turn of the second wire is located between the first turn of the first wire and the second turn of the first wire. The coil component according to claim 1 .

7. The final turn of the second wire is located closer to the second flange portion in the direction along the central axis than the final turn of the first wire. The coil component according to claim 1 .

8. the final turn of the first wire is the (2×N)th turn, The final turn of the second wire is the (2×N)th turn. The coil component according to claim 4 or 5.

9. the (N-2)th turn of the second wire is wound outer circumferentially with respect to the first wire between the (N-3)th turn and the (N-2)th turn of the first wire, The (N+2)th turn of the second wire is wound outer circumferentially with respect to the first wire between the (N+2)th turn and the (N+3)th turn of the first wire. The coil component according to claim 5 .

10. The turn of the second wire immediately preceding the (2×N) turn has a third crossing point where it crosses the turn of the first wire immediately preceding the (2×N) turn. The coil component according to claim 8 .

11. The (2×N) turns of the second wire have third crossover locations that cross the (2×N) turns of the first wire. The coil component according to claim 8 .

12. the second wire has a third intersection point that intersects with the first wire at a turn different from the turn having the first intersection point and the turn having the second intersection point; When a specific axis perpendicular to the central axis is defined as a vertical axis, and one of the directions along the vertical axis is defined as an upward direction, the first external electrode and the second external electrode are located on the upper side of the first flange portion with respect to the central axis, the third external electrode and the fourth external electrode are located on the upper side of the second flange portion with respect to the central axis, The third intersection point is located on the upper side of the winding core portion with respect to the central axis. The coil component according to claim 1 .

13. When the winding core is equally divided into three regions in a direction along the central axis, the first intersection point and the second intersection point are located in the central region. The coil component according to claim 1 .

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