Coil component

Abstract

To prevent the insulating coating from melting at the intersection.SOLUTION: A coil component 10 includes a drum core 10C having a winding core 11, a first flange 21, and a second flange 22, and a first external electrode 31, a second external electrode 32, a third external electrode 33, a fourth external electrode 34, a first wire 41, and a second wire 42. The Nth turn of the first wire 41 includes a portion where the first wire 41 finally comes into contact with the outer circumferential surface of the winding core 11 when the first wire is traced from the first wire end 41A to the second wire end 41B. The Mth turn of the second wire 42 includes a portion where the second wire 42 finally comes into contact with the outer circumferential surface of the winding core 11 when the second wire is traced from the first wire end 42A to the second wire end 42B. At this time, the Mth turn of the second wire 42 and the Nth turn of the first wire 41 do not have an intersection portion where they cross each other. The (M-1)th turn of the second wire 42 and the (N-1)th turn of the first wire 41 have a first intersection portion 51 where they cross each other.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] The coil component described in Patent Document 1 includes a core, four external electrodes, a first wire, and a second wire. The core includes a winding core portion, a first flange portion, and a second flange portion. The winding core portion is in the shape of a rectangular prism. 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 a surface of the first flange portion. The remaining two external electrodes are located on a surface of the second flange portion.

[0003] A 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. A 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. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-30170 A Summary of the Invention [Problem to be solved by the invention]

[0005] In a coil component such as that described in Patent Document 1, the wires may cross each other near the second end. When the wires cross each other near the second end, heat from the external electrode is transferred to the crossing point of the wires, and heat is likely to concentrate at the crossing point. Therefore, when the wires cross each other near the second end, it is likely that the insulating coating at the crossing point of the wires will melt. [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 connected to a first end in a direction along a central axis of the winding core, and a second flange connected to a second end of the winding core opposite to the first end, a first external electrode and a second external electrode located on a surface of the first flange, a third external electrode and a fourth external electrode located on a surface of the second flange, and a first wire wound around the winding core, the first wire end being connected to the first external electrode and the second wire end being 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 wire end being connected to the second external electrode and the second wire end being connected to the fourth external electrode, wherein N and M are integers of 2 or more, a point where the first wire first comes into contact with an outer circumferential surface of the winding core when tracing the first wire from the first wire end to the second wire end is defined as a point of 1.0 turn of the first wire, and the number of turns of the first wire is one for each revolution around the central axis from the first wire end toward the second wire end. the Nth turn of the first wire is defined as a turn including a point where the first wire last comes into contact with the outer peripheral surface of the winding core when tracing the first wire from the first wire end to the second wire end, the 1.0th turn of the second wire is defined as a point where the angular position about the central axis when tracing the second wire from the first wire end to the second wire end first matches the angular position of the 1.0th turn of the first wire, and the number of turns of the second wire increases by one for each full rotation around the central axis from the first wire end toward the second wire end, and the Mth turn of the second wire is defined as a turn including a point where the second wire last comes into contact with the outer peripheral surface of the winding core when tracing the second wire from the first wire end to the second wire end, the Mth turn of the second wire and the Nth turn of the first wire do not have an intersection point where they intersect each other, and the (M-1)th turn of the second wire and the (N-1)th turn of the first wire have a first intersection point where they intersect each other. Effect of the Invention

[0007] According to the above configuration, melting of the insulating coating at the first intersection can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a coil component. [Diagram 2] FIG. 2 is a plan view of the coil component. [Diagram 3] FIG. 3 is a diagram illustrating the state of winding of the wire when the coil component is viewed in the third negative direction. [Figure 4] FIG. 4 is a diagram illustrating the state of winding of the wire when the coil component is viewed in the second positive direction. [Diagram 5] FIG. 5 is a diagram illustrating a state of winding of the wire when the coil device of the modified example is viewed in the second positive direction. [Figure 6] FIG. 6 is a plan view of the coil component. [Figure 7] FIG. 7 is a diagram illustrating the state of winding of the wire when the coil component is viewed in the third negative direction. [Figure 8] FIG. 8 is a diagram illustrating the state of winding of the wire when the coil component is viewed in the second positive direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a first embodiment and a second embodiment of the coil component will be described. In addition, in the drawings, components may be shown enlarged to facilitate understanding. The dimensional ratios of the components may differ from the actual ones or from those in other drawings.

[0010] <Regarding the coil component of the first embodiment> (Overall structure) As shown in FIG. 1, the coil device 10 includes a drum core 10C and a top plate 10F.

[0011] The drum core 10C has a winding core portion 11, a first flange portion 21, and a second flange portion 22. The winding core 11 has a quadrangular prism shape. A cross section perpendicular to the central axis 11C of the winding core 11 has a rectangular shape. Note that the "rectangular shape" referred to here may be any shape having four sides and being rectangular overall, and may also include a rectangular shape with chamfered corners. In the first embodiment, the material of the winding core 11 is Ni-Zn ferrite. Also, the material of the winding core 11 may be, for example, alumina, Ni-Zn ferrite, synthetic resin, a mixture thereof, or the like.

[0012] Here, a specific axis parallel to the central axis 11C of the winding core 11 is defined as the first axis X. An axis perpendicular to the first axis X is defined as the second axis Y. In the first embodiment, the second axis Y is parallel to two of the four sides of the winding core 11 when viewed in a direction along the first axis X. An axis perpendicular to both the first axis X and the second axis Y is defined as the third axis Z. In the first embodiment, the third axis Z is parallel to the remaining two of the four sides of the winding core 11 when viewed in a direction along the first axis X. One of the directions along the first axis X is defined as the first positive direction X1, and the opposite direction to the first positive direction X1 is defined as the first negative direction X2. Similarly, one of the directions along the second axis Y is defined as the second positive direction Y1, and the opposite direction to the second positive direction Y1 is defined as the second negative direction Y2. One of the directions along the third axis Z is defined as a third positive direction Z1, and the opposite direction to the third positive direction Z1 is defined as a third negative direction Z2. In the first embodiment, a specific direction perpendicular to the central axis 11C coincides with the third positive direction Z1.

[0013] 1, the first flange portion 21 is connected to a first end, which is an end in the first positive direction X1, of the winding core portion 11. The first flange portion 21 is integrally molded with the winding core portion 11. Therefore, the material of the first flange portion 21 is the same as that of the winding core portion 11, that is, Ni-Zn ferrite.

[0014] The first flange portion 21 protrudes outward relative to the winding core portion 11 in the direction along the second axis Y and the direction along the third axis Z. Furthermore, of the first flange portion 21, a central portion 21A in the direction along the second axis Y protrudes in the third positive direction Z1 relative to both ends in the direction along the second axis Y. In other words, of the first flange portion 21, an end portion in the second positive direction Y1 and an end portion in the second negative direction Y2 are recessed in the third negative direction Z2 relative to the central portion 21A in the direction along the second axis Y.

[0015] The second flange portion 22 is connected to a second end, which is the end on the first negative direction X2 side, of the winding core portion 11. The second flange portion 22 is integrally molded with the winding core portion 11. Therefore, the material of the second flange portion 22 is the same Ni-Zn ferrite as that of the winding core portion 11.

[0016] The second flange portion 22 protrudes outward relative to the winding core portion 11 in the direction along the second axis Y and the direction along the third axis Z. Furthermore, of the second flange portion 22, a central portion 22A in the direction along the second axis Y protrudes in the third positive direction Z1 relative to both ends in the direction along the second axis Y. In other words, of the second flange portion 22, an end portion in the second positive direction Y1 and an end portion in the second negative direction Y2 are recessed in the third negative direction Z2 relative to the central portion 22A in the direction along the second axis Y.

[0017] The top plate 10F is a rectangular plate. The dimension of the top plate 10F in the third axis Z is smaller than the dimension in the direction along the first axis X and the dimension in the direction along the second axis Y. The long side of the top plate 10F is parallel to the first axis X. The short side of the top plate 10F is parallel to the second axis Y. The top plate 10F is located on the third negative direction Z2 side with respect to the drum core 10C. The top plate 10F is connected to both the surface of the first flange 21 facing the third negative direction Z2 and the surface of the second flange 22 facing the third negative direction Z2. That is, the top plate 10F is bridged between the first flange 21 and the second flange 22. The material of the top plate 10F is Ni-Zn ferrite, the same as that of the drum core 10C. Note that the top plate 10F is not shown in Figs. 3 to 5.

[0018] The coil component 10 includes four external electrodes 30. The four external electrodes 30 are a first external electrode 31, a second external electrode 32, a third external electrode 33, and a fourth external electrode . The first external electrode 31 is attached to the first flange 21. The first external electrode 31 is located on a surface on the second positive direction Y1 side with respect to the center of the first flange 21 in the direction along the second axis Y. Moreover, most of the first external electrode 31 is located on the third positive direction Z1 side with respect to the winding core 11.

[0019] The first external electrode 31 has a bonding part BP, a connecting part CP, and a joint part JP. The bonding part BP, the connecting part CP, and the joint part JP are integrally molded. That is, within the first external electrode 31, there is no clear boundary between these members.

[0020] The adhesive portion BP is generally plate-shaped. When the adhesive portion BP is viewed from the direction along the second axis Y, the adhesive portion BP is generally L-shaped. That is, the adhesive portion BP has a surface perpendicular to the first axis X and a surface perpendicular to the third axis Z. A part of the surface perpendicular to the first axis X of the adhesive portion BP is bonded to a surface of the first flange portion 21 on the first positive direction X1 side.

[0021] The connecting portion CP is substantially plate-shaped. The connecting portion CP is connected to an end surface of the adhesive portion BP on the second positive direction Y1 side. The connecting portion CP extends in the second positive direction Y1 as it moves in the third negative direction Z2. When viewed from a direction along the first axis X, the adhesive portion BP is substantially L-shaped. Therefore, the connecting portion CP has a surface perpendicular to the second axis Y and a surface perpendicular to the third axis Z.

[0022] The joint JP is substantially plate-shaped. The joint JP is connected to the end surface of the coupling portion CP on the second positive direction Y1 side. The joint JP is located on the surface of the first flange 21 facing the third positive direction Z1. That is, the joint JP is located on the surface of the first flange 21 on the third positive direction Z1 side with respect to the central axis 11C. The wire end of the wire described below is connected to the surface of the joint JP facing the third positive direction Z1 side. In this way, if the joint JP to which the wire end of the wire is connected is located on the surface of the first flange 21 on the third positive direction Z1 side with respect to the central axis 11C, it can be said that the first external electrode 31 is located on the surface of the first flange 21 on the third positive direction Z1 side with respect to the central axis 11C.

[0023] The second external electrode 32 is attached to the first flange 21. The second external electrode 32 is located on a surface on the second negative direction Y2 side with respect to the center of the first flange 21 in the direction along the second axis Y. A large portion of the second external electrode 32 is located on the third positive direction Z1 side with respect to the winding core 11. The second external electrode 32 has a symmetrical shape with respect to the first external electrode 31. Specifically, the second external electrode 32 and the first external electrode 31 are symmetric with respect to a virtual plane that passes through the central axis 11C and is perpendicular to the second axis Y. Therefore, the second external electrode 32 is located on a surface on the third positive direction Z1 side of the first flange 21 with respect to the central axis 11C.

[0024] The third external electrode 33 is attached to the second flange 22. The third external electrode 33 is located on the surface on the second positive direction Y1 side with respect to the center of the second flange 22 in the direction along the second axis Y. Most of the third external electrode 33 is located on the third positive direction Z1 side with respect to the winding core 11. The third external electrode 33 has a symmetrical shape with respect to the first external electrode 31. Specifically, the third external electrode 33 and the first external electrode 31 are plane-symmetric with respect to a virtual plane that is perpendicular to the central axis 11C and passes through the geometric center of the winding core 11. Therefore, the third external electrode 33 is located on the surface on the third positive direction Z1 side of the second flange 22 with respect to the central axis 11C.

[0025] The fourth external electrode 34 is attached to the second flange 22. The fourth external electrode 34 is located on a surface on the second negative direction Y2 side with respect to the center of the second flange 22 in the direction along the second axis Y. Most of the fourth external electrode 34 is located on the third positive direction Z1 side with respect to the winding core 11. The fourth external electrode 34 has a symmetrical shape with respect to the third external electrode 33. Specifically, the fourth external electrode 34 and the third external electrode 33 are symmetric with respect to a virtual plane that passes through the central axis 11C and is perpendicular to the second axis Y. Therefore, the fourth external electrode 34 is located on a surface on the third positive direction Z1 side of the second flange 22 with respect to the central axis 11C.

[0026] In the first embodiment, the maximum dimension of the coil component 10 in the direction along the first axis X is 3.2 mm. The maximum dimension of the coil component 10 in the direction along the second axis Y is 2.5 mm. The maximum dimension of the coil component 10 in the direction along the third axis Z is 2.3 mm.

[0027] (Regarding the first and second wires) As shown in Fig. 1, the coil device 10 includes a first wire 41 and a second wire 42. The first wire 41 and the second wire 42 are wound around the winding core portion 11. Although not shown in the figure, the first wire 41 has a conductor and an insulating coating. The insulating coating covers the outer surface of the conductor. The first wire 41 has a substantially circular shape in a cross section perpendicular to the direction in which the first wire 41 extends.

[0028] The second wire 42 has the same configuration as the first wire 41. That is, the second wire 42 has a conductor and an insulating coating. Note that in Figs. 3 to 5, the first wire 41 is colored with dots.

[0029] 2, a first wire end 41A of the first wire 41 is connected to the first external electrode 31. A second wire end 41B of the first wire 41 is connected to the third external electrode 33. The first wire end 41A and the second wire end 41B are connected to the corresponding joint JP of the external electrode 30 by thermocompression bonding. Note that thermocompression bonding is a method of clamping a wire between the external electrode 30 and a heated jig, and fixing the wire to the external electrode 30 while melting it.

[0030] Here, when the first wire 41 is traced from the first wire end 41A to the second wire end 41B, the location where the first wire 41 first comes into contact with the outer circumferential surface of the winding core portion 11 is defined as the 1.0 turn location of the first wire 41. In the first embodiment, the 1.0 turn location of the first wire 41 is located on a ridge line on the second negative direction Y2 side and the third positive direction Z1 side of the winding core portion 11.

[0031] As shown in FIG. 3 and FIG. 4, the number of turns of the first wire 41 increases by one each time the first wire 41 makes one revolution around the central axis 11C from the first wire end 41A to the second wire end 41B. The first wire 41 is wound around the winding core 11 so that the number of turns increases as the wire advances clockwise when viewed in the first negative direction X2. Therefore, for example, when viewed in the first negative direction X2, a position that has advanced 36 degrees around the central axis 11C from the 1.0 turn position of the first wire 41 is the 1.1 turn position of the first wire 41. Note that FIG. 3 shows the number of turns of each wire at the ridge position on the third positive direction Z1 side of the winding core 11. Also, FIG. 4 shows the number of turns of each wire located on the central axis 11C of the winding core 11 when viewed in the second positive direction Y1.

[0032] 3, the first wire 41 is wound directly around the winding core 11 over the entire circumference without the second wire 42. Here, "directly wound" refers not only to a state in which the first wire 41 is in contact with the outer circumferential surface of the winding core 11, but also to a state in which the first wire 41 is wound around the winding core 11 without any other wire therebetween, even if the wire is floating.

[0033] Moreover, the first turn of the first wire 41 refers to the section from the 1.0 turn to just before the 2.0 turn of the first wire 41. This also applies to the second wire 42. Note that in Fig. 3 and Fig. 4, the portion of each wire that is located on the first wire end side from the 1.0 turn is illustrated as 0 turn.

[0034] 2, a first wire end 42A of the second wire 42 is connected to the second external electrode 32. A second wire end 42B of the second wire 42 is connected to the fourth external electrode 34. The first wire end 42A and the second wire end 42B are connected to the joint portion JP of the corresponding external electrode 30 by thermocompression bonding.

[0035] Here, when the second wire 42 is traced from the first wire end 42A to the second wire end 42B, the first point where the angular position about the central axis 11C coincides with the angular position of the 1.0 turn point of the first wire 41 is defined as the 1.0 turn point of the second wire 42. That is, in the first embodiment, the 1.0 turn point of the second wire 42 is located on a straight line connecting the ridge line on the second negative direction Y2 side and the third positive direction Z1 side of the winding core 11 and the central axis 11C when viewed in a direction along the first axis X. In the first embodiment, when the second wire 42 is traced from the first wire end 42A to the second wire end 42B, the 1.0 turn point of the second wire 42 is in contact with the outer peripheral surface of the first wire 41 on the side opposite to the surface facing the central axis 11C. Note that the 1.0 turn point of the second wire 42 may be in contact with the outer peripheral surface of the winding core 11.

[0036] As shown in Figs. 3 and 4, the number of turns of the second wire 42 increases by one each time the second wire 42 makes one revolution around the central axis 11C from the first wire end 42A to the second wire end 42B. When viewed in the first negative direction X2, the second wire 42 is wound around the winding core 11 so as to progress clockwise as the number of turns increases. That is, the second wire 42 is wound in the same direction as the first wire 41. A portion of the second wire 42 is wound around the winding core 11 from the outside relative to the first wire 41. In other words, a portion of the second wire 42 is in contact with the outer peripheral surface of the first wire 41 on the side opposite to the surface facing the central axis 11C.

[0037] (Regarding the intersection of the first and second wires) In the following description, N and M are integers equal to or greater than 2. The Nth turn is the turn including the point at which the first wire 41 last comes into contact with the outer circumferential surface of the winding core 11 when tracing the first wire end 41A to the second wire end 41B. The Mth turn is the turn including the point at which the second wire 42 last comes into contact with the outer circumferential surface of the winding core 11 when tracing the second wire 42 from the first wire end 42A to the second wire end 42B.

[0038] At this time, the Mth turn of the second wire 42 and the Nth turn of the first wire 41 do not have a crossing point where they cross each other. On the other hand, the (M-1)th turn of the second wire 42 and the (N-1)th turn of the first wire 41 have a first crossing point 51 where they cross each other. Here, "crossing" means that when one wire is traced from the first wire end to the second wire end, one wire in the same layer as the other wire once rides up on the outer periphery of the other wire and then reaches the same layer as the other wire again. Specifically, the (M-1)th turn of the second wire 42 has a first crossing point 51 where it crosses the (N-1)th turn of the first wire 41. When the second wire 42 is traced from the first wire end 42A to the second wire end 42B, at the first intersection point 51, the second wire 42 straddles the first wire 41 from the first negative direction X2 side to the first positive direction X1 side in the direction along the central axis 11C. In this embodiment, as shown in FIG. 2, a point where the center line of the second wire 42 crosses the center line of the first wire 41 when viewed in a direction perpendicular to the central axis 11C of the winding core portion 11 is defined as an "intersection point." Here, it has been described that "the center line of the second wire 42 crosses the center line of the first wire 41," but this is synonymous with "the center line of the first wire 41 crosses the center line of the second wire 42."

[0039] As shown in Figs. 3 and 4, in the first embodiment, N is 30. M is 30. That is, the 30th turn of the second wire 42 does not intersect with the 30th turn of the first wire 41. The 29th turn of the second wire 42 intersects with the 29th turn of the first wire 41. In addition, the 29.0th turn of the second wire 42 contacts the outer circumferential surface of the winding core portion 11 without passing through the first wire 41. Therefore, the first intersection point 51 rides up onto the first wire 41 and intersects with the first wire 41 in the middle of the turn in which the second wire 42 is wound around the outer circumferential surface of the winding core portion 11.

[0040] The second wire 42 has a first outer circumferential wound portion 61 , a second outer circumferential wound portion 62 , and an inner circumferential wound portion 63 . The first outer circumferential winding portion 61 is a portion wound around the outer circumferential side of the first wire 41 over a plurality of turns. The first outer circumferential winding portion 61 is located on the first wire end 42A side of the second wire 42 with respect to the first intersection point 51. Specifically, the first outer circumferential winding portion 61 is a section from the 1st turn to the 13th turn of the second wire 42.

[0041] The second outer circumferential winding portion 62 is located on the second wire end 42B side of the second wire 42 with respect to the first outer circumferential winding portion 61, and is located on the first wire end 42A side of the second wire 42 with respect to the first intersection point 51. The second outer circumferential winding portion 62 is a portion wound on the outer circumferential side of the first wire 41 over a plurality of turns. Specifically, the second outer circumferential winding portion 62 is a section from the 17th turn to the 27th turn of the second wire 42.

[0042] The second outer circumferential winding portion 62 has a first crossing portion 52 crossing the first wire 41 on the first wire end 42A side with respect to the first intersection portion 51. Here, "crossing" means that one wire crosses the other wire without reaching the same layer as the other wire. That is, the second outer circumferential winding portion 62 has a first crossing portion 52 crossing the first wire 41 without reaching the same layer of the first wire 41. Since the first crossing portion 52 exists in this way, the second outer circumferential winding portion 62 has a portion that contacts the Xth turn of the first wire 41, a portion that contacts the X+1th turn, and a portion that contacts the X+2th turn within one turn (X is a positive integer). As shown in FIG. 3, in the first embodiment, at the 23.0th turn of the second wire 42, the second wire 42 is located between the 21st turn and the 22nd turn of the first wire 41. On the other hand, at the 24.0 turn of the second wire 42, the second wire 42 is located between the 24th and 25th turns of the first wire 41. That is, the 23rd turn of the second wire 42 in the upper layer has a contact point with each of the 22nd, 23rd, and 24th turns of the first wire 41. Here, a groove formed between two adjacent turns of wire is defined as a wire valley. At this time, the 23rd turn of the second wire 42 spans two valleys of the first wire 41 in the direction along the central axis 11C.

[0043] When the second wire 42 is traced from the first wire end 42A to the second wire end 42B, at the first crossing point 52, the second wire 42 crosses the first wire 41 from the first positive direction X1 side to the first negative direction X2 side. That is, at the first crossing point 51, the direction in which the second wire 42 crosses the first wire 41 in the direction along the central axis 11C is opposite to the direction in which the second wire 42 crosses the first wire 41 in the direction along the central axis 11C at the first crossing point 52. Note that, here, when a wire on an upper layer crosses a wire on a lower layer, it is expressed as "the wire on an upper layer crosses the wire on a lower layer." Therefore, for example, "the second wire 42 crosses the first wire 41" refers to a case in which the second wire 42 on the upper layer crosses the first wire 41 wound on a lower layer.

[0044] The inner circumferential winding portion 63 is located between the first outer circumferential winding portion 61 and the second outer circumferential winding portion 62 in the direction along the central axis 11C. The inner circumferential winding portion 63 is a winding portion in which at least a portion of the second wire 42 is continuously wound around the outer circumferential surface of the winding core portion 11, and the range of continuous winding around the outer circumferential side of the first wire 41 is less than 1.0 turn. Specifically, the inner circumferential winding portion 63 is a section from the 14th turn to the 16th turn of the second wire 42.

[0045] The inner circumferential winding portion 63 has a second intersection point 53 where it intersects with the first wire 41. That is, the second wire 42 has the second intersection point 53 where it intersects with the first wire 41 on the first wire end 42A side with respect to the first intersection point 51. The second intersection point 53 is a point where the 15th turn of the second wire 42 intersects with the 15th turn of the first wire 41. When the second wire 42 is traced from the first wire end 42A to the second wire end 42B, at the second intersection point 53, the second wire 42 straddles the first wire 41 from the first negative direction X2 side to the first positive direction X1 side. That is, it is assumed that the second wire 42 is traced from the first wire end 42A to the second wire end 42B. At this time, the direction in which the second wire 42 crosses the first wire 41 in the direction along the central axis 11C at the first intersection point 51 is the same as the direction in which the second wire 42 crosses the first wire 41 in the direction along the central axis 11C at the second intersection point 53.

[0046] In this way, the second wire 42 crosses over the first wire 41 at four locations: the first intersection 51, the two first crossing locations 52, and the second intersection 53. In two of these four locations, when the second wire 42 is traced from the first line end 42A to the second line end 42B, the second wire 42 crosses over the first wire 41 from the first positive direction X1 side to the first negative direction X2 side. In the remaining two locations, the second wire 42 crosses over the first wire 41 in the opposite direction.

[0047] (Location of intersections and crossing points) 1, the first intersection point 51, the first crossing point 52, and the second intersection point 53 are located on the third positive direction Z1 side with respect to the central axis 11C. Specifically, the first intersection point 51, the first crossing point 52, and the second intersection point 53 are located on the outer circumferential surface of the winding core portion 11 on the third positive direction Z1 side with respect to the central axis 11C. In this way, each point is located on the same side as the joint portion JP of each external electrode 30 when the central axis 11C is used as a reference.

[0048] 2, when the first intersection point 51 is viewed from the third positive direction Z1 side, the winding core portion 11 is equally divided into three regions in a direction perpendicular to the central axis 11C. That is, the surface of the winding core portion 11 facing the third positive direction Z1 is equally divided into three regions in a direction along the second axis Y. In this case, the first intersection point 51 is located in the central region P.

[0049] Here, suppose that an imaginary line L is drawn that passes through the first intersection point 51 and is parallel to the central axis 11C. In this case, the second intersection point 53 is not located on the imaginary line L. In other words, the position of the second intersection point 53 in the direction along the second axis Y is different from that of the first intersection point 51. Specifically, when viewed in the third negative direction Z2, the second intersection point 53 is located on the second negative direction Y2 side with respect to the first intersection point 51.

[0050] (Regarding mode conversion characteristics) The coil component 10 of the first embodiment and the coil component of the comparative example were subjected to measurement of Ssd12 as an index related to the mode conversion characteristics. Various dimensions of the coil component of the comparative example are the same as those of the coil component 10 of the first embodiment. The material of the drum core and the material of the top plate of the coil component of the comparative example are the same as those of the coil component 10 of the first embodiment. The number of turns of the first wire and the second wire of the coil component of the comparative example is 30 turns, the same as that of the coil component 10 of the first embodiment. The winding mode of the coil component of the comparative example is the same as that of the coil component 10 of the first embodiment, except for the first intersection point. The intersection point located closest to the second wire end side in the coil component of the comparative example is located on the outer peripheral surface of the winding core part 11 on the second negative direction Y2 side, not on the same side as the joint JP of each external electrode 30, when the central axis 11C is used as a reference. Specifically, the intersection point in the coil component of the comparative example is the 30th turn of the first wire and the second wire. Twenty of each coil component were produced. That is, the number of samples was 20 for each coil component.

[0051] In the measurement, the coil component 10 of the first embodiment and the coil component of the comparative example were mounted on a 3-port board conforming to the Open Alliance. Then, after performing SOLT calibration on each coil component, the Ssd12 of each coil component was measured. Then, the measurement results obtained from each coil component, i.e., the average value of 20 measurement results, was used as the representative value of the measurement results.

[0052] In the coil component 10 of the first embodiment, when the measurement frequency was 500 kHz, Ssd12 was −82.0 dB. In addition, in the coil component of the comparative example, when the measurement frequency was 500 kHz, Ssd12 was −79.6 dB. That is, it was found that the value of Ssd12 can be suppressed when the position of the first intersection point 51 is located on the third positive direction Z1 side, that is, on the same side as the joint JP of the external electrode 30. In particular, the effect of suppressing the value of Ssd12 in the coil component 10 of the first embodiment compared to the comparative example was particularly noticeable when the frequency was 1 GHz or less.

[0053] (Effects of the first embodiment) (1-1) According to the above embodiment, the first wire 41 and the second wire 42 do not have an intersection point after the final turn. In other words, the first wire 41 and the second wire 42 do not intersect in the vicinity of the second flange portion 22, such as the region where the first wire 41 and the second wire 42 are separated from the winding core portion 11 and drawn to the corresponding external electrode 30. On the other hand, the first intersection point 51 is located in the turn before the final turn of the second wire 42. That is, the first intersection point 51 is considerably separated from the second wire end 42B on the line of the second wire 42. Therefore, heat from the external electrode 30 is not easily transmitted to the first intersection point 51. Therefore, it is possible to suppress the coating of the first wire 41 and the coating of the second wire 42 from melting due to heat at the first intersection point 51.

[0054] (1-2) In the above embodiment, the inner circumferential winding portion 63 has a second intersection point 53 that intersects with the first wire 41. Furthermore, the second wire 42 has a first crossing point 52 that crosses the first wire 41 on the first line end 42A side of the first intersection point 51. According to this configuration, it is possible to balance the stray capacitances before and after the second intersection point 53 and before and after the first crossing point 52, improving the electrical characteristics.

[0055] (1-3) In the above embodiment, the direction in which the second wire 42 crosses over the first wire 41 in the direction along the central axis 11C at the first intersection point 51 is opposite to the direction in which the second wire 42 crosses over the first wire 41 in the direction along the central axis 11C at the first crossing point 52. At the crossing point, the first wire 41 is pressed against the second wire 42 and wound. Therefore, an external force acts on the first wire 41 in the direction in which the second wire 42 crosses over. Since the crossing directions are different at the first intersection point 51 and the first crossing point 52, the external force acting on the first wire 41 acts to cancel out the external force. As a result, according to the above configuration, the position of the first wire 41 is less likely to shift, and the winding of the second wire 42 is stable.

[0056] (1-4) The direction in which the second wire 42 crosses over the first wire 41 in the direction along the central axis 11C at the first intersection point 51 is the same as the direction in which the second wire 42 crosses over the first wire 41 in the direction along the central axis 11C at the second intersection point 53. That is, the crossing direction alternates between the first intersection point 51, the first crossing point 52, and the second intersection point 53. With this configuration, when the second wire 42 is wound, the direction of the external force acting on the first wire 41 by the second wire 42 is not biased. Therefore, the position of the first wire 41 is less likely to shift, and the winding of the second wire 42 is stable.

[0057] (1-5) In the above embodiment, the second intersection point 53 is not located on the imaginary line L that passes through the first intersection point 51 and is parallel to the central axis 11C. In other words, when viewed in the third negative direction Z2, the first intersection point 51 and the second intersection point 53 have different intersecting positions in the direction along the second axis Y. According to this configuration, the winding of the second wire 42 is more stable than in a mode in which the positions of the intersection points in the direction along the second axis Y are concentrated at specific positions.

[0058] (1-6) In the above embodiment, the first intersection point 51 is located on the third positive direction Z1 side with respect to the central axis 11C. In other words, the first intersection point 51 is located on the same side as the joint JP of the outer electrode 30. With this configuration, the asymmetry of electrical characteristics such as inductance and capacitance is reduced, and the mode conversion characteristics are improved, as shown by the measurement results of Ssd12. That is, with this configuration, Ssd12 is improved compared to a coil component in which the first intersection point 51 is located on the second negative direction Y2 side at the 30th turn.

[0059] (1-7) In the above embodiment, when the winding core portion 11 is equally divided into three regions in the direction along the second positive direction Y1 when the first intersection point 51 is viewed from the third positive direction Z1 side, the first intersection point 51 is located in the central region P. Since the first intersection point 51 is located in the central region P, winding disturbances at the first intersection point 51 are unlikely to occur. In particular, in the vicinity of the final turn, it is difficult to obtain the effect of restricting positional deviation by other adjacent turns. Therefore, with the above configuration, winding disturbances at the first intersection point 51 can be efficiently suppressed.

[0060] <Regarding the coil component according to the second embodiment> Hereinafter, a coil device 100 according to the second embodiment will be described. Note that the same reference numerals are used for configurations similar to those of the first embodiment, and descriptions thereof will be omitted or simplified.

[0061] 6, in the coil device 100 of the second embodiment, the second wire 42 differs from the first embodiment in that it does not have an inner circumferential winding portion 63. In addition, in the coil device 100 of the second embodiment, the second wire 42 differs from the first embodiment in that it has a multilayer portion TL described later.

[0062] 7 and 8, in the second embodiment, the second wire 42 has a first intersection point 51, which is the same as in the first embodiment. That is, the Mth turn of the second wire 42 and the Nth turn of the first wire 41 do not have an intersection point where they intersect with each other. Also, the (M-1)th turn of the second wire 42 and the (N-1)th turn of the first wire 41 have a first intersection point 51 where they intersect with each other. In the second embodiment, both N and M are 30.

[0063] (About the second wire) In the coil device 100 of the second embodiment, the second wire 42 has an outer circumferential winding portion 161. The outer circumferential winding portion 161 is a portion wound around the outer circumferential side of the first wire 41 over a plurality of turns. The outer circumferential winding portion 161 is located on the first wire end 42A side of the second wire 42 with respect to the first intersection point 51. Specifically, the outer circumferential winding portion 161 is a section from the 1st turn to the 27th turn of the second wire 42.

[0064] The outer circumferential winding portion 161 has a first crossing portion 52 that crosses the first wire 41 on the first wire end 42A side with respect to the first intersection portion 51. Due to the presence of the first crossing portion 52, the outer circumferential winding portion 161 of the second wire 42 has, within one turn, a portion that contacts the Xth turn of the first wire 41, a portion that contacts the X+1th turn, and a portion that contacts the X+2th turn (X is a positive integer).

[0065] 7, the 23.0 turn location of the second wire 42 is located between the 21st and 22nd turns of the first wire 41. On the other hand, the 24.0 turn location of the second wire 42 is located between the 24th and 25th turns of the first wire 41. That is, the 23rd turn of the upper layer second wire 42 has contact points with each of the 22nd, 23rd, and 24th turns of the first wire 41.

[0066] As shown in Figs. 7 and 8, the outer circumferential winding portion 161 of the second wire 42 has a multilayer portion TL. The multilayer portion TL is a portion of the outer circumferential winding portion 161 in which the second wire 42 is wound in two or more layers continuously for one or more turns. The multilayer portion TL is located on the first wire end 42A side with respect to the first crossing portion 52. In other words, the first crossing portion 52 is located on the first wire end 42A side with respect to the first intersection portion 51 and on the second wire end 42B side with respect to the multilayer portion TL. In this embodiment, the multilayer portion TL is a portion from the middle of the 16th turn to the middle of the 18th turn of the second wire 42. Therefore, in the multilayer portion TL, the second wire 42 is wound in two or more layers continuously for about two turns.

[0067] Specifically, in the outer circumferential winding portion 161, the second wire 42 is directly wound around the outer circumferential side of the first wire 41 from the 1.0 turn position to the approximately 16.5 turn position. The second wire 42 is also directly wound around the outer circumferential side of the first wire 41 from the approximately 18.5 turn position to the approximately 28.0 turn position. In contrast, the second wire 42 is directly wound around the outer circumferential side of the portion of the second wire 42 before the 16th turn from the approximately 16.5 turn position to the approximately 18.5 turn position. In other words, the second wire 42 rides up on the outer circumferential side of the first layer portion of the second wire 42 from the approximately 16.5 turn position to the approximately 18.5 turn position. Note that "directly wound" includes not only a state in which the second wire 42 is in contact with the outer circumferential surface of the first wire 41 or the second wire 42, but also a state in which the second wire 42 is floating with respect to the wires in the lower layer.

[0068] More specifically, in the multi-layered portion TL, the location of about 16.5 turns of the second wire 42 is located between the location of about 13.5 turns and the location of about 14.5 turns of the second wire 42. The location of 17.5 turns of the second wire 42 is located between the location of 14.5 turns and the location of 15.5 turns of the second wire 42. That is, the 16th turn of the second wire 42 runs over the outer periphery of the 13th and 14th turns of the second wire 42 from the location of about 16.5 turns. The 17th turn of the second wire 42 runs over the outer periphery of the 14th and 15th turns of the second wire 42. Therefore, in the multi-layered portion TL, the second wire 42 overlaps in two layers. Therefore, in the multi-layered portion TL, the first wire 41 and the second wire 42 overlap in a total of three layers. Also, the second wire 42 has a portion where the second wire 42 crosses over in the multi-layered portion TL. At the portion where the second wires 42 intersect with each other, three second wires 42 are lined up in a direction perpendicular to the central axis 11C.

[0069] In this way, the 16th turn of the second wire 42 in the multi-layer portion TL is in a state of being rewound approximately two turns toward the first flange portion 21. Therefore, in a turn before the multi-layer portion TL, the Xth turn of the second wire 42 is located between the valleys of the Xth turn and the (X+1)th turn of the first wire 41. On the other hand, in a turn after the multi-layer portion TL and before the first crossing portion 52, the Xth turn of the second wire 42 is located between the valleys of the (X-2)th turn and the (X-1)th turn of the first wire 41. Therefore, when the second wire 42 is traced from the first wire end 41A to the second wire end 42B, the second wire 42 crosses the first wire 41 from the first negative direction X2 side to the first positive direction X2 side in the multi-layer portion TL. Furthermore, after the multi-layer portion TL, when the second wire 42 is wound from the second layer to the first layer, it crosses the first wire 41 from the first positive direction X1 side to the first negative direction X2 side.

[0070] (Effects of the second embodiment) According to the second embodiment, in addition to the effects (1-1), (1-3), and (1-5) to (1-7) of the first embodiment, the following effects are achieved.

[0071] (2-1) In the second embodiment, the outer circumferential winding portion 161 of the second wire 42 has a multi-layer portion TL that is wound in two or more layers on the outer circumferential side of the first wire 41. The presence of this multi-layer portion TL makes it possible to switch whether the Xth turn of the second wire 42 is located on the first positive direction X1 side or the first negative direction X2 side with respect to the Xth turn of the first wire 41. In this way, by switching the positional relationship of the wires in the direction along the central axis 11C midway, it is possible to adjust the stray capacitance generated between the wires.

[0072] (2-2) In the second embodiment, the outer circumferential winding portion 161 has the first crossing portion 52 on the first wire end 42A side with respect to the first intersection portion 51 and on the second wire end 42B side with respect to the multilayer portion TL. In this manner, by not locating the first crossing portion 52 extremely close to the first flange 21 or the second flange 22 side, asymmetry in electrical characteristics such as inductance and capacitance is reduced. As a result, the mode conversion characteristics can be improved.

[0073] <Example of change> The above embodiment and the following modified examples can be implemented in combination with each other to the extent that no technical contradiction occurs.

[0074] (Examples of changes to coil parts) In the above embodiment, it is possible to omit the top plate 10F of the coil device 10. Furthermore, the dimensions of the coil device 10 are not limited to those in the above embodiment.

[0075] The shape of the winding core 11 is not limited to the example of the above embodiment. For example, the shape of the winding core 11 may be a cylinder or a polygonal prism other than a quadrangular prism. The configuration of the drum core 10C is not limited to the example of the above embodiment. For example, the first flange 21 and the second flange 22 may not protrude in the third positive direction Z1 at the central portion in the direction along the second axis Y. For example, the first flange 21 and the second flange 22 may be recessed at the central portion in the direction along the second axis Y and may have a bifurcated shape.

[0076] The method of connecting the joints JP of the external electrodes 30 and the wire ends of the wires is not limited to thermocompression bonding. For example, the wire ends of the wires may be joined to the joints JP by a laser or by other methods.

[0077] The material and shape of the external electrode 30 are not limited to those in the above embodiment. The external electrode 30 may be any material as long as it is connectable to the first wire 41 and the second wire 42. For example, the external electrode 30 may have a metal layer and a plating layer, and the wires may be connected to the plating layer.

[0078] (Examples of changes to wires) In the above embodiment, the values ​​of N and M are not limited as long as they are integers equal to or greater than 2. For example, the value of N and the value of M may be different.

[0079] The number of turns of the first outer circumferential wound portion 61, the number of turns of the second outer circumferential wound portion 62, and the number of turns of the inner circumferential wound portion 63 are not limited to the examples in the above embodiment. 5, the 1.0 turn portion of the second wire 42 is wound directly around the outer circumferential surface of the winding core portion 11 without the first wire 41. Specifically, the first turn of the second wire 42 is located on the first negative direction X2 side with respect to the first turn of the first wire 41. The second wire 42 is wound around the outer circumferential side with respect to the first wire 41 from the second turn to the thirteenth turn. That is, the first outer circumferential winding portion 61 is the section from the second turn to the thirteenth turn.

[0080] 5, the second wire 42 is wound on the outer circumferential side of the first wire 41 from the 17th turn to the 26th turn. Then, in the middle of the 27th turn, the second wire 42 is wound directly around the outer circumferential surface of the winding core portion 11 without using the first wire 41. That is, the second outer circumferential winding portion 62 is the section from the 17th turn to the 26th turn.

[0081] 5, the inner circumferential winding portion 63 is located between the first outer circumferential winding portion 61 and the second outer circumferential winding portion 62 in the direction along the central axis 11C. The inner circumferential winding portion 63 is a portion of the second wire 42 that is continuously wound around the outer circumferential side of the first wire 41 by less than 1.0 turn. Specifically, the inner circumferential winding portion 63 is a section from the 14th turn to the 16th turn of the second wire 42.

[0082] 5, on the outer peripheral surface of the winding core portion 11, not only the first turn of the first wire 41 but also the second turn of the second wire 42 are present before the second turn of the first wire 41. In this way, the first turn of the two wires can regulate the positional deviation of the second turn and thereafter of the first wire 41 in the first positive direction X1, so that it is possible to prevent the first wire 41 and the second wire 42 from becoming uncoiled after the second turn.

[0083] The second wire 42 may include an outer circumferential winding portion that is wound around the outer circumferential side of the first wire 41 over a plurality of turns, in addition to the first outer circumferential winding portion 61 and the second outer circumferential winding portion 62. The second wire 42 may include an inner circumferential winding portion that is continuously wound around the outer circumferential side of the first wire 41 by less than 1.0 turn in each turn of the second wire 42, in addition to the inner circumferential winding portion 63. For example, in the above embodiment, the second wire 42 may include a third outer circumferential winding portion, a second inner circumferential winding portion, and a second outer circumferential winding portion 62, in this order, on the second wire end 42B side of the inner circumferential winding portion 63.

[0084] The second wire 42 may omit the first crossing point 52 and the second intersection point 53. Specifically, the second wire 42 may omit both the first crossing point 52 and the second intersection point 53, or may omit either the first crossing point 52 or the second intersection point 53. For example, the first crossing points 52 and the second crossing points 53 may be appropriately selected depending on the number of crossings and the direction in which the wires cross in the portion where each wire is drawn out from the winding core portion 11 and reaches the external electrode 30.

[0085] The direction in which the second wire 42 crosses the first wire 41 in the direction along the central axis 11C at the first intersection point 51 may be the same as the direction in which the second wire 42 crosses the first wire 41 in the direction along the central axis 11C at the first crossing point 52. This crossing direction can be changed as appropriate depending on whether or not another wire crosses and the crossing direction of that wire at the crossing point.

[0086] The direction in which the second wire 42 crosses over the first wire 41 in the direction along the central axis 11C at the first intersection point 51 may be opposite to the direction in which the second wire 42 crosses over the first wire 41 in the direction along the central axis 11C at the second intersection point 53. This crossing direction can be changed as appropriate depending on whether or not there is another wire crossing and the crossing direction of that wire at the crossing point.

[0087] When the coil device 10 is viewed in the second positive direction Y1, the second wire 42 does not have to cross the first wire 41 in the vicinity of 1.0 turn of the second wire 42. If the second wire 42 has a plurality of pairs of crossing points with respect to the first wire 41 that cross in different directions, the twist of the wire is generally eliminated.

[0088] The first intersection point 51 may be located at a location other than the central region P. The position of the first intersection point 51 in the direction along the central axis 11C, the position along the second axis Y, and the position along the third axis Z are not limited to the examples of the above embodiment. That is, the first intersection point 51 may be located on the outer circumferential surface of the winding core portion 11 other than the surface facing the third positive direction Z1. As a result, the first intersection point 51 may be located on the outer circumferential surface of the winding core portion 11 in a direction different from the direction in which the external electrode 30 is located in each flange portion.

[0089] At the first intersection point 51, the first wire 41 may cross over the second wire 42 from the outer circumferential side. In other words, as long as the (M-1)th turn of the second wire 42 and the (N-1)th turn of the first wire 41 cross each other, either wire may be positioned on the outer circumferential side at the first intersection point 51.

[0090] (Examples of changes to multi-layered parts) In the second embodiment, the number of turns at the start of the multilayer portion TL and the number of turns at the end of the multilayer portion TL are not limited to those in the above embodiment. It is sufficient that the second wire 42 is wound continuously for at least one turn in two or more layers. Therefore, the multilayer portion TL may have one turn or three or more turns.

[0091] The position of the multilayer portion TL is not limited to the example of the above embodiment. That is, the multilayer portion TL may be located on the second line end 42B side with respect to the first crossing point 52. In other words, the first crossing point 52 may be located on the first line end 42A side with respect to the multilayer portion TL.

[0092] <Additional Notes> The technical ideas 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 connected to a first end in a direction along a central axis of the winding core, and a second flange connected to a second end of the winding core opposite to the first end, a first external electrode and a second external electrode located on a surface of the first flange, a third external electrode and a fourth external electrode located on a surface of the second flange, a first wire wound around the winding core, a first wire end connected to the first external electrode and a second wire end connected to the third external electrode, a second wire wound around the winding core in the same direction as that of the first wire, the first wire end being connected to the second external electrode and the second wire end being connected to the fourth external electrode, wherein N and M are integers of 2 or more, a point where the first wire first comes into contact with an outer circumferential surface of the winding core when the first wire is traced from the first wire end to the second wire end is defined as a point of 1.0 turn of the first wire, and the number of turns of the first wire increases by 1 for each revolution around the central axis from the first wire end toward the second wire end. a turn including a point where the first wire last comes into contact with the outer peripheral surface of the winding core when tracing the first wire from the first wire end to the second wire end is defined as the N-th turn, a point where the second wire first comes into contact with the outer peripheral surface of the winding core when tracing the second wire from the first wire end to the second wire end is defined as the 1.0-turn point of the second wire, and the number of turns of the second wire increases by one for each full rotation around the central axis from the first wire end toward the second wire end, and a turn including a point where the second wire last comes into contact with the outer peripheral surface of the winding core when tracing the second wire from the first wire end to the second wire end is defined as the M-th turn, the M-th turn of the second wire and the N-th turn of the first wire do not have an intersection point where they intersect each other, and the (M-1)-th turn of the second wire and the (N-1)-th turn of the first wire have a first intersection point where they intersect each other.

[0093] [2] The coil component described in [1], wherein the second wire has an outer circumferential winding portion wound around the first wire over a plurality of turns, and the outer circumferential winding portion has a first crossing portion on the first wire end side relative to the first intersection portion, the first crossing portion crossing the first wire without reaching the same layer of the first wire.

[0094] [3] The coil component described in [2], wherein when the second wire is traced from the first line end to the second line end, the direction in which the second wire crosses the first wire in the direction along the central axis at the first intersection point is opposite to the direction in which the second wire crosses the first wire in the direction along the central axis at the first crossing point.

[0095] [4] The coil component according to any one of [1] to [3], wherein the second wire has a first outer peripheral winding portion wound outer circumferentially about the first wire over a plurality of turns, a second outer peripheral winding portion located on the second wire end side with respect to the first outer peripheral winding portion and wound outer circumferentially about the first wire over a plurality of turns, and an inner peripheral winding portion located between the first outer peripheral winding portion and the second outer peripheral winding portion in a direction along the central axis, at least a portion of which is wound around the outer circumferential surface of the winding core portion, and the range of the second wire that is continuously wound around the outer circumferential side of the first wire is less than 1.0 turn, and the inner peripheral winding portion has a second intersection point where it intersects with the first wire.

[0096] [5] A coil component as described in [4], wherein when the second wire is traced from the first line end to the second line end, the direction in which the second wire crosses the first wire in the direction along the central axis at the first intersection is the same as the direction in which the second wire crosses the first wire in the direction along the central axis at the second intersection.

[0097] [6] The coil component according to [5], wherein the second intersection point is not located on an imaginary line that passes through the first intersection point and is parallel to the central axis. [7] The coil component according to any one of [1] to [6], wherein, when a specific direction perpendicular to the central axis is defined as a positive direction, the first external electrode and the second external electrode are located on a surface of the first flange portion on the positive side with respect to the central axis, the third external electrode and the fourth external electrode are located on a surface of the second flange portion on the positive side with respect to the central axis, and the first intersection point is located on an outer peripheral surface of the winding core portion on the positive side with respect to the central axis.

[0098] [8] The coil component described in [7], wherein when the winding core portion is divided equally into three regions in a direction perpendicular to both the central axis and the specific direction when the first intersection point is viewed from the positive direction side, the first intersection point is located in the central region.

[0099] [9] The coil component described in any one of [1] to [8], wherein the second wire has an outer circumferential winding portion wound around the first wire over a plurality of turns, and the outer circumferential winding portion has a multi-layer portion in which the second wire is wound continuously over one or more turns in two or more layers.

[0100]

[10] The coil component described in [9], wherein the outer peripheral winding portion has a first crossing portion on the first wire end side with respect to the first intersection portion and on the second wire end side with respect to the multilayer portion, the first crossing portion straddling the first wire without reaching the same layer of the first wire. [Explanation of symbols]

[0101] P...area 10...Coil parts 10C…Drum core 11...Core 11C…Central axis 21…First flange 22…Second flange 31...First external electrode 32…Second external electrode 33...Third external electrode 34...Fourth external electrode 41…First wire 42…Second wire 51…First intersection 52…First crossing point 53…Second intersection 61...First outer circumferential winding portion 62...Second outer peripheral winding portion 63…Inner winding part 100...Coil parts 161...Outer peripheral winding part TL…Multilayer part

Claims

1. a drum core having a columnar winding core portion, a first flange portion connected to a first end of the winding core portion in a direction along a central axis thereof, and a second flange portion connected to a second end of the winding core portion on the opposite side to the first end; a first external electrode and a second external electrode located on a surface of the first flange portion; a third external electrode and a fourth external electrode located on a surface of the second flange portion; a first wire wound around the winding core, a first wire end connected to the first external electrode and a second wire end connected to the third external electrode; a second wire wound around the winding core in the same direction as the first wire, a first wire end connected to the second external electrode, and a second wire end connected to the fourth external electrode; Equipped with N and M are integers of 2 or more, A location of the first wire that first comes into contact with the outer circumferential surface of the winding core when tracing the first wire from the first wire end to the second wire end is defined as a 1.0 turn location of the first wire, the number of turns of the first wire increases by one each time the first wire makes one revolution around the central axis from the first wire end toward the second wire end, and the turn including a location that last comes into contact with the outer circumferential surface of the winding core when tracing the first wire from the first wire end to the second wire end is defined as the Nth turn, When the second wire is traced from the first wire end to the second wire end, a point where an angular position about the central axis first coincides with an angular position of a point of 1.0 turn of the first wire is defined as a point of 1.0 turn of the second wire, the number of turns of the second wire increases by one for each revolution about the central axis from the first wire end toward the second wire end, and the turn including a point where the second wire last comes into contact with the outer circumferential surface of the winding core portion is defined as the Mth turn. The Mth turn of the second wire and the Nth turn of the first wire do not have an intersection point where they intersect with each other, The (M-1)th turn of the second wire and the (N-1)th turn of the first wire have a first intersection point where they intersect with each other. Coil parts.

2. The second wire is a peripheral winding portion that is wound around the first wire on an outer circumferential side over a plurality of turns, The outer circumferential winding portion has a first crossing portion that crosses the first wire on the first wire end side with respect to the first crossing portion without reaching the same layer of the first wire. The coil component according to claim 1 .

3. When the second wire is traced from the first line end to the second line end, a direction in which the second wire crosses the first wire in a direction along the central axis at the first intersecting point is opposite to a direction in which the second wire crosses the first wire in a direction along the central axis at the first crossing point. The coil component according to claim 2 .

4. The second wire is a first outer circumferential winding portion wound around the first wire by a plurality of turns; a second outer circumferential winding portion located on the second wire end side with respect to the first outer circumferential winding portion and wound around the first wire outer circumferential side over a plurality of turns; an inner circumferential winding portion located between the first outer circumferential winding portion and the second outer circumferential winding portion in a direction along the central axis, at least a portion of which is wound around an outer circumferential surface of the winding core portion, and the range of the inner circumferential winding portion wound continuously around the outer circumferential side of the first wire in the second wire is less than 1.0 turn; It has The inner circumferential winding portion has a second intersection point that intersects with the first wire. The coil component according to claim 1 .

5. When the second wire is traced from the first line end to the second line end, a direction in which the second wire crosses the first wire in a direction along the central axis at the first intersection point is the same as a direction in which the second wire crosses the first wire in a direction along the central axis at the second intersection point. The coil component according to claim 4 .

6. The second intersection point is not located on an imaginary line that passes through the first intersection point and is parallel to the central axis. The coil component according to claim 5 .

7. When a specific direction perpendicular to the central axis is defined as a positive direction, the first external electrode and the second external electrode are located on a surface of the first flange portion on the positive side with respect to the central axis, the third external electrode and the fourth external electrode are located on a surface of the second flange portion on the positive side with respect to the central axis, The first intersection point is located on an outer circumferential surface of the winding core portion on the positive side with respect to the central axis. The coil component according to claim 1 .

8. When the winding core is equally divided into three regions in a direction perpendicular to both the central axis and the specific direction when the first intersection point is viewed from the positive direction side, the first intersection point is located in the central region. The coil component according to claim 7.

9. the second wire includes an outer circumferential winding portion wound around the first wire by a plurality of turns, The outer circumferential winding portion has a multi-layer portion in which the second wire is wound continuously for one or more turns in two or more layers. The coil component according to claim 1 .

10. The outer circumferential winding portion has a first crossing portion on the first wire end side with respect to the first intersection portion and on the second wire end side with respect to the multilayer portion, the first crossing portion straddling the first wire without reaching the same layer of the first wire. The coil component according to claim 9.

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