Coil component

Abstract

To provide a coil component allowing an orientation thereof to be distinguished.SOLUTION: A coil component 10 includes: a drum core 10C including a winding core portion, a first flange portion 21 and a second flange portion 22; a first outer electrode 31, a second outer electrode 32, a third outer electrode 33, and a fourth outer electrode 34; and a first wire 41 and a second wire 42. The second wire 42 includes a first winding portion 51 and a second winding portion 52. The first winding portion 51 is a portion including plural turns wound around an outer periphery of the first wire 41. The second winding portion 52 is located on a second wire end 42B side relative to the first winding portion 51 and includes less than 1.0 turn continuously wound around the outer periphery of the first wire 41. When a position closest to a second wire end side 42A in the first winding portion 51 is an end point of the first winding portion 51, the first winding portion 51 includes a first traverse portion 61 that runs across the first wire 41 without running in the same layer as the first wire 41 in a section from the end point to a point before one turn.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 2016-195290 A Summary of the Invention [Problem to be solved by the invention]

[0005] In a coil component as described in Patent Document 1, electrical and magnetic characteristics may change depending on the direction of the current flowing through each wire. Therefore, in order to obtain the expected characteristics of the coil component, it is necessary to mount the coil component on a substrate in a predetermined orientation. For example, it is conceivable to make the orientation of the coil component distinguishable by attaching an optically observable mark to the core of the coil component. However, in this case, since an additional manufacturing process must be added just for the purpose of attaching the mark, the manufacturing process becomes unavoidably complicated. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a drum core having a columnar winding core portion, a first flange portion connected to a first end in a direction along a central axis of the winding core portion, and a second flange portion connected to a second end of the winding core portion opposite 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 portion, a first wire end connected to the first external electrode and a second wire end connected to the third external electrode, and a second wire wound around the winding core portion in the same direction as the first wire, a first wire end connected to the second external electrode and a second wire end connected to the fourth external electrode, the number of turns increases by one for each revolution around the central axis from the first wire end toward the second wire end, the second wire comprising: a first winding portion wound outer circumferentially about the first wire over a plurality of turns; and a second winding portion located closer to the second wire end than the first winding portion, at least a portion of which is wound around the outer circumferential surface of the winding core portion, and the range of continuous winding around the outer circumferential side of the first wire being less than 1.0 turn, and when the position of the first winding portion closest to the second wire end when tracing the second wire from the first wire end to the second wire end in the first winding portion is defined as the end point of the first winding portion, the first winding portion has a first crossing portion that crosses the first wire without reaching the same layer of the first wire, in a section from the end point to the point one turn before the end point. Effect of the Invention

[0007] The orientation of the coil component can be determined without marking the core. [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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Overall structure> As shown in FIG. 1, the coil device 10 includes a drum core 10C and a top plate 10F.

[0010] 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 this 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.

[0011] 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 this 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 this 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 this embodiment, a specific direction perpendicular to the central axis 11C coincides with the third positive direction Z1.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] The third external electrode 33 is attached to the second flange 22. The third external electrode 33 is located on a 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 symmetric with respect to a virtual plane that is perpendicular to the central axis 11C and passes through the center C of the winding core 11. Therefore, the third external electrode 33 is located on a surface on the third positive direction Z1 side of the second flange 22 with respect to the central axis 11C.

[0024] 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.

[0025] In this 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.

[0026] <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.

[0027] 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.

[0028] 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.

[0029] 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 this embodiment, the 1.0 turn location of the first wire 41 is located on a ridgeline on the second negative direction Y2 side and the third positive direction Z1 side of the winding core portion 11.

[0030] 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.

[0031] 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.

[0032] The first turn of the first wire 41 refers to a section from the 1.0 turn to just before the 2.0 turn of the first wire 41. The final turn of the first wire 41 refers to a turn including a position where the first wire 41 last comes into contact with the outer circumferential surface of the winding core portion 11 when tracing the first wire 41 from the first wire end 41A to the second wire end 41B. In this embodiment, the final turn of the first wire 41 is the 21st turn.

[0033] 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.

[0034] 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 this 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 this 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.

[0035] 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.

[0036] The final turn of the second wire 42 refers to a turn including a portion where the second wire 42 finally comes into contact with the outer circumferential surface of the winding core portion 11 when tracing the second wire 42 from the first wire end 42A to the second wire end 42B. In this embodiment, the final turn of the second wire 42 is 21 turns. Note that in Figs. 3 and 4, a portion of each wire that is located closer to the first wire end than 1.0 turn is illustrated as 0 turn.

[0037] <Winding of the first wire and the second wire> As shown in FIG. 2, the second wire 42 includes a first winding portion 51 and a second winding portion 52.

[0038] 3, the first winding portion 51 is a portion wound around the outer periphery of the first wire 41 over a plurality of turns. In this embodiment, the first winding portion 51 is a portion from the 1.0 turn of the second wire 42 to the middle of the 17th turn. In other words, the first winding portion 51 is a portion of the second wire 42 from the point where the second wire 42 rides up onto the outer periphery of the first wire 41 to the point just before it is directly wound around the winding core 11.

[0039] As shown in FIG. 3 and FIG. 4, the first to eighth turns of the second wire 42 are directly wound around the outer circumferential side of the first wire 41. Then, in the middle of the ninth turn of the second wire 42, the second wire 42 is directly wound around the outer circumferential side of the portion of the second wire 42 before the eighth turn. That is, in the middle of the ninth turn of the second wire 42, the second wire 42 runs over the outer circumferential surface of the second layer portion of the second wire 42. Specifically, the ninth turn of the second wire 42 runs over the outer circumferential surface of the second layer portion of the second wire 42 on the surface of the winding core portion 11 on the second positive direction Y1 side. Then, from the middle, the ninth turn of the second wire 42 is wound around a position between the sixth and seventh turns of the second wire 42. In this way, the first winding portion 51 includes a portion TL where the second wire 42 is wound around two or more layers on the outer circumferential side of the first wire 41.

[0040] As shown in FIG. 4, the 9th turn of the second wire 42 crosses the first wire 41 on the surface of the winding core 11 on the second positive direction Y1 side. Here, "crossing" means that one wire straddles the other wire without reaching the same layer as the other wire. Since there is a crossing point, the second wire 42 has a contact point at the Xth turn of the first wire 41, a contact point at the X+1th turn, and a contact point at the X+2th turn within one turn (X is a positive integer). When the second wire 42 is traced from the first wire end 42A 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 X1 side at the crossing point. 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 a wire on a lower layer". Therefore, for example, "the second wire 42 straddles the first wire 41" refers to a case where the second wire 42 in the upper layer straddles the first wire 41 wound in a lower layer. In this embodiment, a portion within 0.5 turns of the 9th turn of the second wire 42 is located between the 9th turn and the 10th turn of the first wire 41. On the other hand, a portion 0.5 turns or more after the 9th turn of the second wire 42 is located between the 6th turn and the 7th turn of the second wire 42. The 9th turn of the second wire 42 in the upper layer has a portion indirectly contacting each of the 7th turn, the 8th turn, and the 9th turn of the first wire 41 through the second layer of the second wire 42. Here, a groove formed between two adjacent turns of wire is defined as a valley of the wire. At this time, the 9th turn of the second wire 42 spans two valleys of the first wire 41 in the direction along the central axis 11C.

[0041] Similarly, the tenth turn of the second wire 42 is wound directly around the outer circumferential side of the second layer portion of the second wire 42. Then, in the middle of the eleventh turn of the second wire 42, the second wire 42 moves from the outer circumferential side of the second layer portion of the second wire 42 to the outer circumferential side of the first wire 41. Specifically, the eleventh turn of the second wire 42 moves to the outer circumferential side of the first wire 41 on the surface of the winding core portion 11 on the second positive direction Y1 side. Then, the twelfth turn to the sixteenth turn of the second wire 42 are wound directly around the outer circumferential side of the first wire 41 over the entire circumference.

[0042] 3, the 16th turn of the second wire 42 has a crossing portion with respect to the first wire 41. Specifically, the 16th turn of the second wire 42 has contact portions with the 16th turn, the 17th turn, and the 18th turn of the first wire 41, respectively. Specifically, the crossing portion is 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. That is, the crossing portion is located at a position at the 16th turn that is wound 0.5 turns or more.

[0043] Partway through the 17th turn, the second wire 42 moves from the outer circumferential surface of the first wire 41 to the outer circumferential surface of the winding core portion 11. Specifically, as shown in Fig. 4, the 17th turn of the second wire 42 moves from the outer circumferential surface of the first wire 41 to the outer circumferential surface of the winding core portion 11 on the surface on the third negative direction Z2 side of the winding core portion 11. That is, the second wire 42 moves to the outer circumferential surface of the winding core portion 11 within a range of 17.0 turns to 17.5 turns.

[0044] The location of the second wire 42 immediately before being directly wound around the outer circumferential surface of the winding core 11 is the position of the first winding portion 51 closest to the second wire end 42B when tracing the second wire 42 from the first wire end 42A to the second wire end 42B in the first winding portion 51. In other words, the location of the 17th turn that is located on the third negative direction Z2 side is the end point EP of the first winding portion 51.

[0045] In this embodiment, the crossing point at the 16th turn of the second wire 42 is a first crossing point 61 that crosses the first wire 41 without reaching the same layer as the first wire 41 in a section from the end point EP to the previous turn. That is, the first winding portion 51 has the first crossing point 61.

[0046] 2, the first crossing portion 61 is located on the third positive direction Z1 side with respect to the central axis 11C. Specifically, the first crossing portion 61 is 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. That is, the first crossing portion 61 is located on the same side as the joints JP of the external electrodes 30 when the central axis 11C is used as a reference. Furthermore, when the second wire 42 is traced from the first wire end 42A to the second wire end 42B, at the first crossing portion 61, the second wire 42 straddles the first wire 41 from the first positive direction X1 side to the first negative direction X2 side in the direction along the central axis 11C.

[0047] 2, when viewed in the third negative direction Z2, the first winding portion 51 is located on the first flange portion 21 side with respect to the center C of the winding core 11 in the direction along the central axis 11C. In other words, the first winding portion 51 is closer to the first positive direction X1 side of the winding core 11.

[0048] 3, the second winding portion 52 is located on the second wire end 42B side of the second wire 42 with respect to the first winding portion 51. The second winding portion 52 is a winding portion of the second wire 42, at least a portion of which is wound around the outer periphery of the winding core portion 11, and the range of the second wire 42 that is continuously wound around the outer periphery of the first wire 41 is less than 1.0 turn. Specifically, the second winding portion 52 is from the middle of the 17th turn of the second wire 42 to the final turn of the second wire 42. In other words, the second winding portion 52 includes the final turn of the second wire 42.

[0049] 3 and 4, the 18th and 19th turns of the second wire 42 are wound directly around the outer circumferential surface of the winding core portion 11. The 18th turn of the second wire 42 is located on the first negative direction X2 side with respect to the 18th turn of the first wire 41. The outer surface of the 18th turn of the second wire 42 on the first positive direction X1 side is in contact with the outer surface of the 18th turn of the first wire 41 on the first negative direction X2 side. On the other hand, the 17th turn of the second wire 42 is separated from the 18th turn of the first wire 41 in the direction along the central axis 11C.

[0050] Moreover, the 19th turn of the first wire 41 is located on the first negative direction X2 side with respect to the 18th turn of the second wire 42. The 19th turn of the second wire 42 is located on the first negative direction X2 side with respect to the 19th turn of the first wire 41. The outer surface of the 19th turn of the second wire 42 on the first positive direction X1 side is in contact with the outer surface of the 19th turn of the first wire 41 on the first negative direction X2 side. On the other hand, the 18th turn of the second wire 42 is located away from the 19th turn of the first wire 41 in the direction along the central axis 11C. That is, the second winding portion 52 has a portion PA arranged away from the adjacent wires on at least one side in the direction along the central axis 11C. Also, the outer peripheral surface of the winding core portion 11 is exposed from the portion PA arranged away from the adjacent wires in the direction along the central axis 11C.

[0051] The second winding portion 52 has a first intersection point 62 where it intersects with the first wire 41. Specifically, the turn before the final turn of the second wire 42 and the turn before the final turn of the first wire 41 have a first intersection point 62 where they intersect with each other. That is, in this embodiment, the 20th turn of the second wire 42 has the first intersection point 62. Here, "intersect" 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 on the outer periphery of the other wire and then reaches the same layer as the other wire again. In this embodiment, as shown in FIG. 2, the "intersection point" is 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. Note that, although it has been explained herein that "the center line of the second wire 42 crosses the center line of the first wire 41," this is synonymous with "the center line of the first wire 41 crosses the center line of the second wire 42."

[0052] As shown in FIG. 2, in this embodiment, the first intersection point 62 is located on the third positive direction Z1 side with respect to the central axis 11C. Specifically, the first intersection point 62 is 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. That is, the first intersection point 62 is located on the same side as the joints JP of the external electrodes 30 when the central axis 11C is used as a reference. In addition, when the second wire 42 is traced from the first wire end 42A to the second wire end 42B, at the first intersection point 62, 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. 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 crossing point 61 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 intersection point 62.

[0053] In this embodiment, the second winding portion 52 does not have any intersection points other than the first intersection point 62. The other points of the second winding portion 52 than the first intersection point 62 are directly wound around the outer circumferential surface of the winding core portion 11. In other words, the second winding portion 52 runs onto the first wire 41 only in the vicinity of the first intersection point 62. Therefore, the range of the second winding portion 52 that is continuously wound around the outer circumferential side of the first wire 41 is less than 1.0 turn.

[0054] 2, when the second wire 42 is traced from the first wire end 42A to the second wire end 42B, the point TP that finally comes into contact with the outer circumferential surface of the winding core portion 11 is a point at the 21st turn that comes into contact with the ridge line on the third positive direction Z1 side and the second positive direction Y1 side of the winding core portion 11. When the winding core portion 11 is equally divided into three regions in the direction along the central axis 11C, the point TP is located in the region AP closest to the second flange portion 22 among the three regions.

[0055] Incidentally, the 1.0 turn location of the first wire 41 is located on the first positive direction X1 side with respect to the 1.0 turn location of the second wire 42. Therefore, as shown in Fig. 4, when the coil device 10 is viewed in the second positive direction Y1, the second wire 42 crosses the first wire 41 near the 1.0 turn location of the second wire 42. At this crossing location near the 1.0 turn, when the second wire 42 is traced from the first wire end 42A to the second wire end 42B, the second wire 42 straddles the first wire 41 from the first positive direction X1 side to the first negative direction X2 side.

[0056] In this way, the second wire 42 crosses over the first wire 41 at four locations: the crossing location near the 1.0 turn, the crossing location at the 9th turn of the second wire 42, the first crossing location 61, and the first crossing location 62. 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.

[0057] <Mode conversion characteristics> The coil component 10 of the present embodiment, the coil component of Comparative Example 1, and the coil component of Comparative Example 2 were subjected to measurement of Ssd12 as an index related to the mode conversion characteristics. The various dimensions of the coil component of Comparative Example 1 and the coil component of Comparative Example 2 are the same as those of the coil component 10 of the present embodiment. The materials of the drum core and the top plate in the coil components of Comparative Example 1 and Comparative Example 2 are the same as those of the coil component 10 of the present embodiment. The number of turns of each wire in the coil components of Comparative Example 1 and Comparative Example 2 is the same as that of the coil component 10 of the present embodiment, 21 turns. On the other hand, the intersection located closest to the second wire end side in the coil component of Comparative Example 1 is located on the outer circumferential surface facing the second negative direction Y2 of the winding core portion 11, 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 in the coil component of Comparative Example 1 is the 21st turn of the first wire and the second wire. Furthermore, the intersection point located closest to the second wire end in the coil component of Comparative Example 2 is not located on the same side as the joints JP of each external electrode 30 when the central axis 11C is used as a reference, but is located on the outer circumferential surface of the winding core portion 11 facing the third negative direction Z2. Specifically, the intersection point in the coil component of Comparative Example 2 is the 21st turn of the first wire and the second wire. Twenty of each coil component were produced. That is, the number of samples for each coil component was 20.

[0058] In the measurement, the coil component 10 of the present embodiment, the coil component of Comparative Example 1, and the coil component of Comparative Example 2 were each 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 taken as the representative value of the measurement results.

[0059] In the coil component 10 of the present embodiment, the Ssd12 was −77.5 dB when the measurement frequency was 500 kHz. In the coil component of Comparative Example 1, the Ssd12 was −75.0 dB when the measurement frequency was 500 kHz. In the coil component of Comparative Example 2, the Ssd12 was −76.2 dB when the measurement frequency was 500 kHz. That is, it was found that the value of Ssd12 can be suppressed when the first crossing portion 61 is on the third positive direction Z1 side. In other words, it was found that the value of Ssd12 can be suppressed more when the first crossing portion 61 and the joint JP of the external electrode 30 are located on the same side than when the first crossing portion 61 and the joint JP of the external electrode 30 are located on different sides.

[0060] <Effects of this embodiment> (1) According to the above embodiment, where the first winding portion 51 of the second wire 42 exists, the first wire 41 and the second wire 42 form a structure of two or more layers. On the other hand, the second winding portion 52 of the second wire 42 has a single-layer structure because it is not wound around the outer periphery of the first wire 41. In this way, the layer structure of the wire is asymmetric between the first flange portion 21 side and the second flange portion 22 side on the winding core portion 11. Due to this asymmetric structure, the orientation of the coil device 10 can be easily determined by observing the appearance.

[0061] In the above configuration, the first winding section 51 has a first crossing portion 61. In the front and rear turns of the first crossing portion 61, the positional relationship of the first wire 41 and the second wire 42 in the direction along the central axis 11C is reversed. By providing such an intersection portion in the first winding section 51, the number of intersection portions to be provided in the second winding section 52 to eliminate the twisted structure of the two wires can be reduced by one. If the number of intersection portions with the first wire 41 in the second winding section 52 can be reduced, the number of portions in the second winding section 52 where the second wire 42 rides on the first wire 41 can be reduced. That is, the area where only the second wire 42 is continuously wound in a single layer structure on the winding core section 11 can be increased. Therefore, it is easy to distinguish whether each wire has a structure of two or more layers or a single layer structure.

[0062] (2) In the above embodiment, the first winding portion 51 is located on the first flange portion 21 side with respect to the center C of the winding core portion 11 in the direction along the central axis 11C. In this manner, by clearly separating the location where the first winding portion 51 exists from the location where the second winding portion 52 exists with the center C of the winding core portion 11 as the boundary, it is easy to determine the orientation of the coil device 10 using an inspection device or the like.

[0063] (3) In the above embodiment, the first winding portion 51 includes a portion TL where the second wire 42 is wound in two or more layers on the outer peripheral side of the first wire 41. That is, the coil device 10 includes a portion where the coil is wound in a total of three layers. This makes it possible to make the appearance of the portion where the first winding portion 51 exists more different from the appearance of the portion where the second winding portion 52 exists.

[0064] (4) In the above embodiment, the second winding portion 52 includes the final turn of the second wire 42. The turn before the final turn of the second wire 42 and the turn before the final turn of the first wire 41 have a first intersection point 62 where they intersect with each other. In this way, the first intersection point 62 sandwiches the portion of the second wire 42 that is drawn toward the fourth external electrode 34 and the final turn in the direction along the central axis 11C until the second wire end 42B is reached. That is, the first intersection point 62 is located at a position away from the second wire end 42B. Therefore, the total amount of heat concentrated at the first intersection point 62 can be reduced when the second wire end 42B of the second wire 42 is thermocompression-bonded in the manufacturing process.

[0065] (5) In the above embodiment, the first intersection point 62 is located on the third positive direction Z1 side with respect to the central axis 11C. In other words, the first intersection point 62 is located on the same side as the joint JP of the external electrode 30. With this configuration, as shown in the measurement results of Ssd12, the asymmetry of electrical characteristics such as inductance and capacitance is reduced, and therefore, as shown in the measurement results of Ssd12, the mode conversion characteristics are improved. That is, with this configuration, Ssd12 is improved compared to a coil component in which the first intersection point 62 is located at a position other than the third positive direction Z1 side of the winding core portion 11.

[0066] (6) In the above embodiment, 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 61 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 intersection point 62. At the crossing point, the first wire 41 is pressed against the second wire 42 and wound. Therefore, an external force in the direction in which the second wire 42 crosses acts on the first wire 41. Since the crossing directions are different at the first crossing point 61 and the first intersection point 62, the external force acting on the first wire 41 acts to cancel each other out. 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.

[0067] (7) In the above embodiment, the second winding portion 52 has a portion PA that is disposed apart from adjacent wires in the direction along the central axis 11C. As described above, the winding core portion 11 is exposed from the portion PA that is disposed apart from adjacent wires. Since the materials of the wires and the winding core portion 11 are different, the wires and the winding core portion 11 have different optical characteristics. Therefore, the orientation of the coil device 10 can also be determined by optically observing the winding core portion 11 in the section where the second winding portion 52 is located.

[0068] (8) In the above embodiment, when the second wire 42 is traced from the first wire end 42A to the second wire end 42B, the point TP where the second wire 42 last comes into contact with the outer circumferential surface of the winding core portion 11 is located in the region AP closest to the second flange portion 22 among the above-mentioned three regions. That is, the final turn of the second wire 42 is located closer to the second flange portion 22. This configuration can prevent the portion of the second wire 42 from the point TP where the second wire 42 last comes into contact with the outer circumferential surface of the winding core portion 11 until the portion is connected to the fourth external electrode 34 from becoming excessively long. As a result, it is possible to prevent the portion of the second wire 42 from getting caught on other members and from breaking in the portion of the second wire 42 from the point TP where the second wire 42 last comes into contact with the outer circumferential surface of the winding core portion 11 until the portion is connected to the fourth external electrode 34.

[0069] (9) In the above embodiment, the 9th turn of the second wire 42 has a crossing point with respect to the first wire 41. According to this configuration, it is possible to balance the stray capacitances before and after the crossing point and before and after the first crossing point 61, thereby improving the electrical characteristics.

[0070] <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.

[0071] <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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] <Examples of changes to wires> The number of turns of the first wire 41 and the second wire 42 is not limited to 21. In addition, the number of turns of the first winding portion 51 and the second winding portion 52 are not limited to the examples in the above embodiment.

[0076] 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 passing through 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. Then, the second wire 42 is wound around the outer circumferential side with respect to the first wire 41 from the second turn to the fifteenth turn.

[0077] In the example shown in FIG. 5, the second wire 42 moves from the outer peripheral surface of the first wire 41 to the outer peripheral surface of the winding core 11 in the middle of the 16th turn. Then, the second wire 42 is located on the outer peripheral surface of the winding core 11 at the 17.0-turn location. In the example shown in FIG. 5, the end location EP of the first winding portion 51 is located at a location less than the 17.0-turn location. That is, in the example shown in FIG. 5, the first winding portion 51 is from the 2nd turn to the 16th turn. Note that, in the example shown in FIG. 5, the 16th turn of the second wire 42 crosses the first wire 41, as in the above embodiment. That is, in the example shown in FIG. 5, the first winding portion 51 has a first crossing location 61 that crosses the first wire 41 without reaching the same layer of the first wire 41 in the section from the end location EP to the location one turn before.

[0078] 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.

[0079] The second wire 42 may omit the first intersection point 62. For example, the first intersection point 62 may be appropriately adopted depending on the number and directions of intersections and crossings in the portion where each wire is drawn out from the winding core portion 11 and reaches the external electrode 30.

[0080] 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 61 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 intersection point 62. This crossing direction can be changed as appropriate depending on whether or not the wires cross and the crossing direction at the crossing point.

[0081] 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 in which the second wire 42 crosses over the first wire 41 in different directions, the twist of the wire is generally eliminated.

[0082] The second wire 42 may have a further crossing point at a location other than the first crossing point 62 of the above embodiment. Also, the second wire 42 may have a further crossing point at a location other than the first crossing point 61 of the above embodiment.

[0083] The position of the first intersection point 62 in the direction along the central axis 11C, the position in the direction along the second axis Y, and the position in the direction along the third axis Z are not limited to the examples in the above embodiment. That is, the first intersection point 62 may be located on an 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 62 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. The same applies to the first crossing point 61.

[0084] The first winding portion 51 does not have to be located on the first flange portion 21 side with respect to the center C of the winding core portion 11 in the direction along the central axis 11C. In other words, the first winding portion 51 may also reach the second flange portion 22 side with respect to the center C of the winding core portion 11 in the direction along the central axis 11C.

[0085] The first winding portion 51 does not have to include a portion TL where the second wire 42 is wound in two or more layers on the outer circumferential side of the first wire 41. In other words, the first winding portion 51 does not have to have a third layer.

[0086] The second winding portion 52 does not have to have the portion PA that is disposed apart from adjacent wires in the direction along the central axis 11C. The point TP where 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 is not limited to the position of the region AP among the three regions closest to the second flange 22. In other words, the point TP where the second wire 42 last comes into contact with the outer circumferential surface of the winding core 11 may be located in the other two regions.

[0087] At the first intersection point 62, the first wire 41 may cross the second wire 42 from the outer circumferential side. In other words, as long as the turn before the final turn of the first wire 41 and the turn before the final turn of the second wire 42 cross each other, either wire may be positioned on the outer circumferential side at the first intersection point 62.

[0088] <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 portion, a first flange portion connected to a first end in a direction along a central axis of the winding core portion, and a second flange portion connected to a second end of the winding core portion opposite 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 portion and having a first wire end connected to the first external electrode and a second wire end connected to the third external electrode, and a second wire wound around the winding core portion in the same direction as the first wire and having a first wire end connected to the second external electrode and a second wire end connected to the fourth external electrode, wherein the number of turns of the first wire increases by one for each revolution around the central axis from the first wire end toward the second wire end, a second winding portion that is located closer to the second wire end than the first winding portion, at least a portion of which is wound around the outer peripheral surface of the winding core portion, and that has a range of continuous winding around the outer peripheral side of the first wire of less than 1.0 turn; and when the position of the first winding portion closest to the second wire end when tracing the second wire from the first wire end to the second wire end in the first winding portion is defined as an end point of the first winding portion, the first winding portion has a first crossing portion that crosses the first wire without reaching the same layer of the first wire in a section from the end point to a point one turn before the end point.

[0089] [2] The coil component according to [1], wherein the first winding portion is located on the first flange side with respect to the center of the winding core portion in a direction along the central axis. [3] The coil component according to [1] or [2], wherein the first winding portion includes a portion where the second wire is wound in two or more layers on the outer peripheral side of the first wire.

[0090] [4] The coil component according to any one of [1] to [3], wherein when a turn including a point that last comes into contact with an outer peripheral surface of the winding core portion when tracing from the first wire end to the second wire end is defined as a final turn, the second winding portion includes the final turn of the second wire, and the turn immediately before the final turn of the first wire and the turn immediately before the final turn of the second wire have a first intersection point where they intersect with each other.

[0091] [5] The coil component according to [4], 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.

[0092] [6] A coil component as described in [4] or [5], wherein when the second wire is traced from the first wire end to the second wire end, the direction in which the second wire crosses the first wire in the direction along the central axis at the first crossing 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 intersection point.

[0093] [7] The coil component according to any one of [1] to [6], wherein the second winding portion has a portion that is disposed apart from adjacent wires on at least one side in a direction along the central axis.

[0094] [8] A coil component according to any one of [1] to [7], wherein when the winding core portion is equally divided into three regions in a direction along the central axis, the point at which the second wire finally comes into contact with the outer circumferential surface of the winding core portion when traced from the first wire end to the second wire end is located in the region closest to the second flange portion among the three regions. [Explanation of symbols]

[0095] AP…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…Volume 1 52…Second volume 61…First crossing point 62…First intersection

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 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, the number of turns of the second wire increases by one each time the second wire makes one revolution around the central axis from the first wire end toward the second wire end, The second wire is a first winding portion wound around the first wire on an outer circumferential side thereof through a plurality of turns; a second winding portion located closer to the second wire end than the first winding portion, at least a portion of which is wound around the outer circumferential surface of the winding core portion, and the range of the second winding portion wound continuously around the outer circumferential side of the first wire is less than 1.0 turn; Equipped with When the second wire is traced from the first wire end to the second wire end in the first winding portion, a position of the first winding portion closest to the second wire end is defined as an end point of the first winding portion, and the first winding portion has a first crossing portion that crosses the first wire without reaching the same layer of the first wire in a section from the end point to a point one turn before the end point. Coil parts.

2. The first winding portion is located on the first flange side with respect to the center of the winding core portion in the direction along the central axis. The coil component according to claim 1 .

3. The first winding portion includes a portion where the second wire is wound in two or more layers on an outer circumferential side of the first wire. The coil component according to claim 1 .

4. When tracing from the first wire end to the second wire end, a turn including a portion that lastly comes into contact with an outer peripheral surface of the winding core portion is defined as a final turn, the second winding portion includes the final turn of the second wire; The turn before the final turn of the first wire and the turn before the final turn of the second wire have a first intersection point where they intersect with each other. The coil component according to claim 1 .

5. 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 4 .

6. 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 crossing 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 intersection point. The coil component according to claim 4 .

7. The second winding portion has a portion disposed apart from adjacent wires on at least one side in a direction along the central axis. The coil component according to claim 1 .

8. When the winding core is equally divided into three regions in a direction along the central axis, a point where the second wire finally comes into contact with an outer circumferential surface of the winding core when the second wire is traced from the first wire end to the second wire end is located in the region closest to the second flange among the three regions. The coil component according to claim 1 .

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