Coil component

Abstract

To suppress deterioration of voltage resistance of a coil component.SOLUTION: A coil component 10 comprises a drum core 10C including: a winding core part 11; a first flange part 20; and a second flange part 30. The coil component 10 comprises: a first wire 51; and a second wire 52. When tracing the first wire 51 from a first line end 51A to a second line end 51B, a portion where is contacted to an outer peripheral surface of the winding core part 11 at first is a portion A1 where the first wire 51 is turned by 1.0. When tracing the second wire 52 from the first line end 52A to the second line end 52B, a place where an angular position as a center of a center shaft C is matched to the angular position of the portion A1 where the first wire 51 is turned by 1.0 at first is a portion B1 where the second wire 52 is turned by 1.0. The portion A1 where the first wire 51 is turned by 1.0 is positioned at a second negative direction Y2 side against the center shaft C, and is separated to a direction along the center shaft C to the portion B1 where the second wire 52 is turned by 1.0.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] The coil component described in Patent Document 1 includes a bobbin portion and two flange portions. The bobbin portion is quadrangular prism-shaped. The two flange portions are connected to both ends of the bobbin portion. Each flange portion projects outward from the bobbin portion in a direction orthogonal to the central axis of the bobbin portion. The materials of the bobbin portion and the flange portions are magnetic bodies. These bobbin portion and flange portions constitute the core of the coil component. Further, the coil component includes first to fourth electrodes. The first electrode and the second electrode are located on the upper surface of one flange portion. The third electrode and the fourth electrode are located on the upper surface of the other flange portion.

[0003] The above-described coil component includes a first wire and a second wire. The first wire and the second wire are coated conductors. The first wire is wound around the bobbin portion. The second wire is wound around the bobbin portion. The first wire end of the first wire is thermocompression-bonded to the first electrode. The second wire end of the first wire is thermocompression-bonded to the third electrode. The first wire end of the second wire is thermocompression-bonded to the second electrode. The second wire end of the second wire is thermocompression-bonded to the fourth electrode. When the number of turns increases by one each time the bobbin portion is wound once from the first wire end side to the second wire end side in each wire, the first turn of the first wire and the first turn of the second wire are adjacent to each other in the direction along the central axis of the bobbin portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the coil component described in Patent Document 1, each electrode and each wire are thermocompression bonded. When the thermocompression bonding is performed, the coating film of each wire may be deteriorated by the influence of heat. In particular, among each wire, the portion close to the electrode is likely to be affected by heat.

[0006] Further, in a portion where the first wire and the second wire are adjacent to each other, if a potential difference is generated between the first wire and the second wire, a relatively large electric field is generated between the two wires. And if the portion where the coating film of the wire described above is deteriorated coincides with the portion where a large electric field is generated between the two wires, there is a possibility that current leakage may occur at that portion. That is, the withstand voltage characteristics of the coil component may be deteriorated.

[0007] Although an example in which the wire is thermocompression bonded to the electrode has been described above, the same problem occurs regardless of the connection mode as long as the coating film may be deteriorated when the wire is connected to the electrode.

Means for Solving the Problems

[0008] To solve the above problems, the present invention provides a drum core having a columnar core part, a first flange part connected to a first end in a direction along the central axis of the core part, and a second flange part connected to a second end on the opposite side of the first end in the core part. When a specific direction orthogonal to the central axis is defined as the positive direction and the direction opposite to the positive direction is defined as the negative direction, on the outer surface of the first flange part, a first electrode located on the positive direction side with respect to the central axis, a second electrode located on the negative direction side with respect to the central axis on the outer surface of the first flange part, a third electrode located on the positive direction side with respect to the central axis on the outer surface of the second flange part, a fourth electrode located on the negative direction side with respect to the central axis on the outer surface of the second flange part, a first wire wound around the core part, with a first wire end connected to the first electrode and a second wire end connected to the third electrode, and a second wire wound around the core part in the same direction as the first wire, with a first wire end connected to the second electrode and a second wire end connected to the fourth electrode. When tracing the first wire from the first wire end to the second wire end, the point where it first contacts the outer peripheral surface of the core part is defined as the 1.0 turn point of the first wire, and the number of turns increases by 1 each time it makes one full turn around the central axis from the first wire end to the second wire end side of the first wire. When tracing the second wire from the first wire end to the second wire end, the point where the angular position around the central axis first coincides with the angular position of the 1.0 turn point of the first wire is defined as the 1.0 turn point of the second wire, and the number of turns increases by 1 each time it makes one full turn around the central axis from the first wire end to the second wire end side of the second wire. When the 1.0 turn point of the first wire is located on the negative direction side with respect to the central axis, and in the direction along the central axis, between the 1.0 turn point of the first wire and the 1.0 turn point of the second wire, there is a coil component where the 2.0 turn point of the second wire is located.

[0009] In the above configuration, depending on the direction of the current flowing through each wire, a relatively large potential difference may occur between the 1.0-turn portion of the first wire and the 1.0-turn portion of the second wire. In the above configuration, compared with the configuration in which the 1.0-turn portion of the first wire and the 1.0-turn portion of the second wire are wound adjacent to each other, the electric field generated between the 1.0-turn portions of each wire is reduced. As a result, it is possible to suppress a decrease in the withstand voltage characteristics of the coil component.

Effect of the Invention

[0010] Suppress a decrease in the withstand voltage characteristics of the coil component.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiment for Carrying Out the Invention

[0012] Hereinafter, an embodiment of the coil component will be described. Note that the drawings may show the components enlarged for easy understanding. The dimensional ratios of the components may be different from the actual ones or those in another drawing.

[0013] <Regarding the Overall Configuration> As shown in FIG. 1, the coil component 10 includes a drum core 10C and a top plate 12.

[0014] The drum core 10C has a core part 11, a first flange part 20, and a second flange part 30. The core part 11 has a quadrangular prism shape. The cross-section orthogonal to the central axis C of the core part 11 is rectangular. Here, the “rectangular shape” means that it has four sides and is rectangular as a whole, and also includes a shape with rounded corners of the rectangle. The material of the core part 11 is a non-conductive material. Specifically, the material of the core part 11 is, for example, alumina, Ni-Zn ferrite, resin, and mixtures thereof.

[0015] Here, a specific axis parallel to the central axis C of the core part 11 is defined as the first axis X. Also, a specific axis orthogonal to the first axis X is defined as the second axis Y. In the present embodiment, when viewed in the direction facing along the first axis X, the second axis Y is parallel to two of the four sides of the core part 11. Further, an axis orthogonal to both the first axis X and the second axis Y is defined as the third axis Z. In the present embodiment, when viewed in the direction facing along the first axis X, the third axis Z is parallel to the remaining two of the four sides of the core part 11. Then, one of the directions along the first axis X is defined as the first positive direction X1, and the direction opposite 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 direction opposite to the second positive direction Y1 is defined as the second negative direction Y2. Also, one of the directions along the third axis Z is defined as the third positive direction Z1, and the direction opposite to the third positive direction Z1 is defined as the third negative direction Z2.

[0016] As shown in FIG. 1, the first flange part 20 is connected to the first end which is the end of the core part 11 in the first positive direction X1. The first flange part 20 has a substantially square plate shape that is flat in the direction along the first axis X. When viewed in the direction facing along the first axis X, each side of the first flange part 20 is parallel to each side of the core part 11. Also, the first flange part 20 projects outward with respect to the core part 11 in the direction along the second axis Y and the direction along the third axis Z.

[0017] Here, among the first flange portion 20, the surface facing the first positive direction X1 side is defined as the first outer end surface 22, and the surface facing the first negative direction X2 side is defined as the first inner end surface 23. Also, among the first flange portion 20, the surface facing the second positive direction Y1 side is defined as the first side surface 24, and the surface facing the second negative direction Y2 side is defined as the second side surface 25. Further, among the first flange portion 20, the surface facing the third positive direction Z1 side is defined as the first bottom surface 26, and the surface facing the third negative direction Z2 side is defined as the first top surface 27.

[0018] The first outer end surface 22 and the first inner end surface 23 are surfaces orthogonal to the central axis C. The first bottom surface 26 and the first top surface 27 are surfaces parallel to the central axis C. Also, the first bottom surface 26 and the first top surface 27 are surfaces parallel to the mounting surface that faces the substrate when the coil component 10 is mounted on the substrate. The first side surface 24 and the second side surface 25 are surfaces parallel to the central axis C and orthogonal to the first bottom surface 26.

[0019] The first flange portion 20 has a recessed portion 21. The recessed portion 21 is recessed with respect to the first bottom surface 26 of the first flange portion 20. The recessed portion 21 is open on both sides of the first flange portion 20 in the direction along the first axis X. As a result, the first bottom surface 26 of the first flange portion 20 is divided into two portions with the recessed portion 21 in between. Note that the first flange portion 20 has a symmetric shape in the direction along the second axis Y.

[0020] The second flange portion 30 is connected to the second end, which is the end on the first negative direction X2 side of the bobbin portion 11. The second flange portion 30 has a symmetric shape with the first flange portion 20 in the direction along the first axis X. That is, the second flange portion 30 is substantially in the shape of a square plate.

[0021] Here, among the second flange portion 30, the surface facing the first negative direction X2 side is defined as the second outer end surface 32, and the surface facing the first positive direction X1 side is defined as the second inner end surface 33. Also, among the second flange portion 30, the surface facing the second positive direction Y1 side is defined as the third side surface 34, and the surface facing the second negative direction Y2 side is defined as the fourth side surface 35. Further, among the second flange portion 30, the surface facing the third positive direction Z1 side is defined as the second bottom surface 36, and the surface facing the third negative direction Z2 side is defined as the second top surface 37.

[0022] The second outer end face 32 and the second inner end face 33 are planes orthogonal to the central axis C. The second bottom face 36 and the second top face 37 are planes parallel to the central axis C. Also, the second bottom face 36 and the second top face 37 are planes parallel to the mounting face that faces the substrate when mounting the coil component 10 on the substrate. The third side face 34 and the fourth side face 35 are planes parallel to the central axis C and orthogonal to the second bottom face 36.

[0023] The second flange portion 30 protrudes outward with respect to the bobbin portion 11 in the direction along the second axis Y and the direction along the third axis Z. Also, the second flange portion 30 has a recessed portion 31. The recessed portion 31 is recessed with respect to the second bottom face 36 of the second flange portion 30.

[0024] The materials of the above-mentioned first flange portion 20 and second flange portion 30 are the same non-conductive material as the bobbin portion 11. Also, the first flange portion 20 and the second flange portion 30 are integrally molded with the bobbin portion 11. In this embodiment, the maximum dimension in the direction along the first axis X of the drum core 10C is 3.2 mm. Also, the maximum dimension in the direction along the second axis Y of the drum core 10C is 2.5 mm. Also, the maximum dimension in the direction along the third axis Z of the drum core 10C is 2.3 mm.

[0025] The top plate 12 is in the shape of a rectangular plate. The top plate 12 is flat in the direction along the third axis Z. The long side of the top plate 12 is parallel to the first axis X. The short side of the top plate 12 is parallel to the second axis Y. The top plate 12 is located on the side of the third negative direction Z2 with respect to the drum core 10C. The top plate 12 is connected to both the first top face 27 in the first flange portion 20 and the second top face 37 in the second flange portion 30. That is, the top plate 12 is bridged between the first flange portion 20 and the second flange portion 30. The material of the top plate 12 is the same non-conductive material as the bobbin portion 11. Note that, in FIGS. 2 and later, the illustration of the top plate 12 is omitted.

[0026] The coil component 10 includes a first electrode 41, a second electrode 42, a third electrode 43, and a fourth electrode 44. The first electrode 41 is located on the outer surface of the first flange portion 20. Specifically, the first electrode 41 is located on the first bottom surface 26. Also, the first electrode 41 is located on the first bottom surface 26 on the second positive direction Y1 side with respect to the central axis C. Specifically, the first electrode 41 is located on the second positive direction Y1 side with respect to the recessed portion 21.

[0027] The second electrode 42 is located on the outer surface of the first flange portion 20. Specifically, the second electrode 42 is located on the first bottom surface 26. Also, the second electrode 42 is located on the first bottom surface 26 on the second negative direction Y2 side with respect to the central axis C. Specifically, the second electrode 42 is located on the second negative direction Y2 side with respect to the recessed portion 21.

[0028] The third electrode 43 is located on the outer surface of the second flange portion 30. Specifically, the third electrode 43 is located on the second bottom surface 36. Also, the third electrode 43 is located on the second bottom surface 36 on the second positive direction Y1 side with respect to the central axis C. Specifically, the third electrode 43 is located on the second positive direction Y1 side with respect to the recessed portion 31.

[0029] The fourth electrode 44 is located on the outer surface of the second flange portion 30. Specifically, the fourth electrode 44 is located on the second bottom surface 36. Also, the fourth electrode 44 is located on the second bottom surface 36 on the second negative direction Y2 side with respect to the central axis C. Specifically, the fourth electrode 44 is located on the second negative direction Y2 side with respect to the recessed portion 31.

[0030] These first electrode 41 to fourth electrode 44 have a metal layer and a plating layer. The material of the metal layer is silver. The metal layer is formed on the outer surface of the first flange portion 20 or the second flange portion 30. The plating layer consists of three layers. The plating layer is laminated in the order of copper, nickel, and tin on the surface of the metal layer. In FIG. 1, the illustration of the boundary between the metal layer and the plating layer is omitted. Note that the end face on the third positive direction Z1 side of the coil component 10 is the mounting surface that faces the substrate when the coil component 10 is mounted on the substrate.

[0031] <Regarding the First Wire and the Second Wire> As shown in FIG. 1, the coil component 10 includes a first wire 51 and a second wire 52. The first wire 51 and the second wire 52 are wound around the bobbin portion 11. Although not shown, the first wire 51 has a copper wire and an insulating coating. The insulating coating covers the outer surface of the copper wire. The first wire 51 has a substantially circular cross-section in a plane orthogonal to the direction in which the first wire 51 extends. The outer diameter of the first wire 51 is about 100 μm. The second wire 52 has the same configuration as the first wire 51. That is, the second wire 52 has a copper wire and an insulating coating. The outer diameter of the second wire 52 is about 100 μm. In FIG. 1, the first wire 51 is colored with dots.

[0032] As shown in FIG. 2, the first wire end 51A of the first wire 51 is connected to the first electrode 41. The second wire end 51B of the first wire 51 is connected to the third electrode 43. The first wire end 51A and the second wire end 51B are connected to the corresponding electrodes by thermocompression bonding.

[0033] Here, when tracing the first wire 51 from the first wire end 51A to the second wire end 51B, the location where it first contacts the outer peripheral surface of the bobbin portion 11 is defined as the location A1 of 1.0 turn of the first wire 51. In the present embodiment, the location A1 of 1.0 turn of the first wire 51 is located on the ridge line on the second negative direction Y2 side and the third positive direction Z1 side of the bobbin portion 11. That is, the location A1 of 1.0 turn of the first wire 51 is located on the second negative direction Y2 side with respect to the central axis C.

[0034] Also, it is assumed that the number of turns increases by 1 each time a full circle is made around the central axis C from the first wire end 51A to the second wire end 51B of the first wire 51. When viewed in the direction of the first negative direction X2, the first wire 51 is wound around the bobbin portion 11 so as to proceed clockwise as the number of turns increases. Therefore, for example, when viewed in the direction of the first negative direction X2, the location that has advanced 36 degrees around the central axis C from the location A1 of 1.0 turn of the first wire 51 is the location of 1.1 turns of the first wire 51.

[0035] The first wire end 52A of the second wire 52 is connected to the second electrode 42. The second wire end 52B of the second wire 52 is connected to the fourth electrode 44. The first wire end 52A and the second wire end 52B are connected to the corresponding electrodes by thermocompression bonding to each electrode.

[0036] Here, when tracing the second wire 52 from the first wire end 52A to the second wire end 52B, the location where the angular position centered on the central axis C first coincides with the angular position of the point A1 at one turn of the first wire 51 is defined as the point B1 at one turn of the second wire 52. That is, in the present embodiment, when viewed in the direction along the first axis X, the point B1 at one turn of the second wire 52 is located on the straight line connecting the ridge line on the second negative direction Y2 side and the third positive direction Z1 side of the winding core portion 11 and the central axis C. In the present embodiment, when tracing the second wire 52 from the first wire end 52A to the second wire end 52B, it first contacts the outer peripheral surface of the winding core portion 11 at the point B1 at one turn of the second wire 52. Note that the point B1 at one turn of the second wire 52 may not contact the outer peripheral surface of the winding core portion 11.

[0037] Also, it is assumed that the number of turns increases by one each time it makes one full turn around the central axis C from the first wire end 52A to the second wire end 52B of the second wire 52. The second wire 52 is wound around the winding core portion 11 so that when viewed in the direction of the first negative direction X2, it progresses clockwise as the number of turns increases. That is, the second wire 52 is wound in the same direction as the first wire 51. And a part of the second wire 52 is wound around the winding core portion 11 from the outside with respect to the first wire 51. In other words, a part of the second wire 52 contacts the outer surface on the side opposite to the central axis C among the outer surfaces of the first wire 51.

[0038] <Regarding the turns of the first wire and the second wire> As shown in FIGS. 3 to 5, the first wire 51 has the 9th turn but does not have the 10th turn. That is, the first wire 51 has a portion of 9.0 turns but does not have a portion of 10.0 turns. Further, the first wire 51 is wound directly around the outer peripheral surface of the core portion 11 over substantially the entire range within the range from the portion A1 of 1.0 turn to the portion of 9.0 turns.

[0039] As shown in FIG. 2, the second wire 52 has the 9th turn but does not have the 10th turn. That is, the second wire 52 has a portion of 9.0 turns but does not have a portion of 10.0 turns. Further, in the second wire 52, the range from the portion B1 of 1.0 turn to the middle of the second turn is wound around the outer peripheral surface of the core portion 11. And, in the second wire 52, over substantially the entire range within the range from the middle of the second turn to the portion of 9.0 turns, it is in contact with the first wire 51 from the outside. Note that the "second turn" indicates a range of 2.0 turns or more and less than 3.0 turns in the wire. The same applies to other numerical values.

[0040] The second wire 52 has a first crossing portion CP1 that crosses the portion of the first wire 51 from the first wire end 51A to the portion A1 of 1.0 turn from the outside. The first crossing portion CP1 exists within the range of 1.0 turn or more and less than 2.0 turns of the second wire 52. Specifically, the first crossing portion CP1 is at a location of approximately 1.8 turns of the second wire 52. Further, the first crossing portion CP1 is located on the second negative direction Y2 side with respect to the central axis C. Note that in this embodiment, when viewed in the direction orthogonal to the outer peripheral surface of the core portion 11, that is, in the third negative direction Z2, the location where the center line of the second wire 52 crosses the center line of the first wire 51 is defined as the "crossing portion".

[0041] As shown in FIG. 3, the 2.0-turn portion B2 of the second wire 52 is adjacent to the 1.0-turn portion B1 of the second wire 52 in the direction along the central axis C. And the 2.0-turn portion B2 of the second wire 52 is located between the 1.0-turn portion A1 of the first wire 51 and the 1.0-turn portion B1 of the second wire 52 in the direction along the central axis C. That is, the 1.0-turn portion A1 of the first wire 51 is separated from the 1.0-turn portion B1 of the second wire 52 in the direction along the central axis C.

[0042] Also, as shown in FIGS. 2 to 5, the range of more than 1.0 turn and less than 2.0 turns of the first wire 51 is separated from the range of more than 1.0 turn and less than 2.0 turns of the second wire 52.

[0043] Here, when tracing the second wire 52 from the first wire end 52A to the second wire end 52B side, the location where the second wire 52 first rides on the outside of the portion after the 1.0-turn portion A1 of the first wire 51 is defined as the first riding-up location F. The first riding-up location F exists within the range of 2.0 turns or more and less than 3.0 turns of the second wire 52. Specifically, the first riding-up location F is located at the location of about 2.7 turns of the second wire 52. In this embodiment, the location where the center line of the second wire 52 is first located outside the center line of the first wire 51 is defined as the location of riding up to the outside. Note that the "center line of the wire" is a line passing through the geometric center of the cross-section in a cross-section orthogonal to the extending direction of the wire. That is, at the location where the wire is wound around the winding core portion 11, the center line of the wire extends in the winding direction. Also, the above "outside" coincides with the outside in the circumferential direction centered on the central axis C.

[0044] As shown in FIG. 2, the second wire 52 has a second intersection location CP2 that intersects from the outside with respect to the portion from the 1.0-turn portion A1 to the 2.0-turn portion of the first wire 51. The second intersection location CP2 exists within the range of 2.0 turns or more and less than 3.0 turns of the second wire 52. Specifically, the second intersection location CP2 is at the location of about 2.9 turns of the second wire 52.

[0045] As shown in Fig. 6, assume that the coil component 10 is viewed in cross section by a cross section including the central axis C, the location A1 of 1.0 turn of the first wire 51, and the location B1 of 1.0 turn of the second wire 52. In the direction along the central axis C, from the side of the first flange portion 20 toward the side of the second flange portion 30, the location B1 of 1.0 turn of the second wire 52, the location B2 of 2.0 turns of the second wire 52, the location A1 of 1.0 turn of the first wire 51, and the location of 2.0 turns of the first wire 51 are arranged in this order.

[0046] Also, on the same cross section, in the direction along the central axis C, the location of 3.0 turns of the second wire 52 is located between the location of 2.0 turns and the location of 3.0 turns of the first wire 51. And, in the direction along the central axis C, the location of 4.0 turns of the second wire 52 is located between the location of 3.0 turns and the location of 4.0 turns of the first wire 51. Also, in the subsequent turns of the second wire 52, it is wound between the first wires 51 in the same way. That is, when N is an arbitrary integer of 3 or more and less than 9, in the direction along the central axis C, the location of N turns of the second wire 52 is located between the location of (N - 1) turns and the location of N turns of the first wire 51.

[0047] <Manufacturing method of coil component> The manufacturing method of the coil component 10 has a preparation process, a first process, and a second process. In the preparation process, a drum core 10C having the first electrode 41 to the fourth electrode 44 is prepared as follows.

[0048] First, in the preparation process, the drum core 10C is formed. First, a synthetic resin binder is mixed with ferrite powder, and the formed body formed by press molding is fired. Then, the burrs of the formed body are removed by a barrel to form the drum core 10C. Next, in the drum core 10C, a paste containing silver is baked on the first bottom surface 26 of the first flange portion 20 and the second bottom surface 36 of the second flange portion 30. Each electrode is formed by plating copper, nickel, and tin in this order on the paste.

[0049] Next, in the first step, the first wire 51 is wound around the core part 11 from the side of the first flange part 20 toward the side of the second flange part 30. Then, the first wire end 51A of the first wire 51 is thermocompression bonded to the first electrode 41. Also, the second wire end 51B of the first wire 51 is thermocompression bonded to the third electrode 43. At this time, the insulating coating near the first wire end 51A of the first wire 51 may be peeled off. Similarly, the insulating coating near the second wire end 51B of the first wire 51 may be peeled off.

[0050] Next, in the second step, the second wire 52 is wound around the outer peripheral side of the core part 11 and the first wire 51. Specifically, the first turn of the second wire 52 starts to be wound around the outer peripheral surface of the core part 11. Then, in the middle of the first turn of the second wire 52, in the section from the first wire end 51A of the first wire 51 to the point A1 at 1.0 turn, the second wire 52 is wound from the outside of the first wire 51. Thereby, the first crossing point CP1 is formed. Next, a part of the second turn of the second wire 52 is wound around the outer peripheral surface of the core part 11. Then, in the middle of the second turn of the second wire 52, the second wire 52 is made to ride on the outside of the first turn of the first wire 51. Thereby, the first riding-up point F is formed. Then, in the middle of the second turn of the second wire 52, by winding the second wire 52 while approaching the second flange part 30 side, the second wire 52 is crossed with the first wire 51 again. Thereby, the second crossing point CP2 is formed. Then, the third turn and subsequent turns of the second wire 52 are wound around the outside of the first wire 51. Then, the first wire end 52A of the second wire 52 is thermocompression bonded to the second electrode 42. Also, the second wire end 52B of the second wire 52 is thermocompression bonded to the fourth electrode 44. At this time, the insulating coating near the first wire end 52A of the second wire 52 may be peeled off. Similarly, the insulating coating near the second wire end 52B of the second wire 52 may be peeled off.

[0051] <Effects of the present embodiment> (1) In the common-mode choke coil as in the above-described embodiment, depending on the directions of the currents flowing through the first wire 51 and the second wire 52, a relatively large potential difference occurs between the location A1 of one turn of the first wire 51 and the location B1 of one turn of the second wire 52. In the above-described embodiment, compared with the configuration in which the location A1 of one turn of the first wire 51 and the location B1 of one turn of the second wire 52 are wound adjacent to each other, the electric field generated between the locations of one turn of each wire becomes smaller. As a result, it is possible to suppress a decrease in the withstand voltage characteristics of the coil component 10.

[0052] Further, particularly when the wire ends of each wire are connected to the electrodes by thermocompression bonding, the insulating coating of the wire may deteriorate in the vicinity of the wire ends. And in some cases, the deterioration of the insulating coating may reach the location of one turn of each wire. That is, when the wire ends of the wire are connected by thermocompression bonding, the possibility that the location where the insulating coating has deteriorated and the location where a large electric field is generated between the two wires coincide increases. Thus, the configuration of the above-described embodiment is particularly useful in the coil component 10 having a thermocompression bonding process in the manufacturing process.

[0053] (2) In the above-described embodiment, the range of 1.0 turn or more and less than 2.0 turns of the first wire 51 is separated from the range of 1.0 turn or more and less than 2.0 turns of the second wire 52. That is, in this configuration, the wires do not contact each other over a wide range including the entire first turn of the first wire 51 and the entire first turn of the second wire 52. Therefore, the electric field generated between the two wires can be made smaller more effectively.

[0054] (3) In the above embodiment, in the direction along the central axis C, a portion B2 of 2.0 turns of the second wire 52 is located between a portion B1 of 1.0 turn of the second wire 52 and a portion A1 of 1.0 turn of the first wire 51. Therefore, even if the portion B1 of 1.0 turn of the second wire 52 attempts to move in the direction along the central axis C, the portion B1 of 1.0 turn of the second wire 52 is restricted by the portion B2 of 2.0 turns of the second wire 52. That is, it is difficult for the portion B1 of 1.0 turn of the second wire 52 to move in the direction approaching the portion A1 of 1.0 turn of the first wire 51. According to the above configuration, the portion A1 of 1.0 turn of the first wire 51 and the portion B1 of 1.0 turn of the second wire 52 can be surely separated from each other.

[0055] (4) Compared with the configuration in which the same turns of the first wire 51 and the second wire 52 are wound separately, in the configuration in which the same turns of both wires are wound adjacent to each other, the frequency at which the impedance becomes maximum is higher. According to the above embodiment, after the third turn, the same turns of each wire are wound adjacent to each other. That is, according to the above configuration, preferable impedance characteristics can be obtained particularly in the high-frequency region.

[0056] (5) In the above embodiment, the initial take-up portion F exists within the range of 2.0 turns or more and less than 3.0 turns of the second wire 52. That is, the second wire 52 is wound outside the first wire 51 at an early stage after the portion B2 of 2.0 turns. According to this configuration, it is not necessary to secure a wide space for winding the second wire 52 on the outer peripheral surface of the bobbin portion 11.

[0057] (6) In the above embodiment, the first crossing portion CP1 exists within the range of 1.0 turn or more and less than 2.0 turns of the second wire 52. According to the above configuration, the portion B2 of 2.0 turns of the second wire 52 can be surely arranged between the portion A1 of 1.0 turn of the first wire 51 and the portion B1 of 1.0 turn of the second wire 52.

[0058] (7) In the above embodiment, the first intersection point CP1 is located on the second negative direction Y2 side with respect to the central axis C. According to the above configuration, compared with the configuration in which the first intersection point CP1 is located on the second positive direction Y1 side with the central axis C as a reference, the first intersection point CP1 is located at a position closer to the core part 11. Since the first intersection point CP1 is located at a position close to the core part 11, the position of the first intersection point CP1 is less likely to shift.

[0059] <Modification example> This embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0060] · In the above embodiment, the configuration of the coil component 10 is not limited. For example, the top plate 12 of the coil component 10 can be omitted. Also, the shape of the first flange portion 20 is not limited to the shape of the above embodiment. For example, the first flange portion 20 can omit the recessed portion 21.

[0061] · In the above embodiment, the core part 11 does not have to be quadrangular prism - shaped. For example, the cross - sectional shape of the core part 11 may be circular, elliptical, or a polygonal shape other than a quadrilateral. · In the above embodiment, the ridge lines of the core part 11 may be chamfered. That is, the boundary of each outer peripheral surface includes, for example, a curved surface formed by chamfering the angle formed by adjacent planes with an R - chamfering process.

[0062] · In the above embodiment, the shape and dimensions of the drum core 10C are not limited to the examples of the above embodiment. · In the above embodiment, the material of each electrode is not limited to the examples of the above embodiment. For example, the material of the plating layer in each electrode may be a nickel alloy or the like. Also, each electrode may not have a plating layer and a conductive metal layer may be exposed. Also, each electrode may be a plate - shaped metal terminal.

[0063] · In the above embodiment, the outer diameters of the first wire 51 and the second wire 52 are not limited to the examples of the above embodiment. ·In the above embodiment, the position of the first intersection point CP1 is not limited to the example of the above embodiment. For example, the first intersection point CP1 may be located on the second positive direction Y1 side with respect to the central axis C. Further, the second wire 52 may not have the first intersection point CP1. That is, the position B2 of the 2.0 turns of the second wire 52 may be located on the first negative direction X2 side with respect to the position A1 of the 1.0 turn of the first wire 51.

[0064] ·In the above embodiment, the first take-up position F is not limited to the position of the above embodiment. That is, the first take-up position F may exist less than the position B2 of the 2.0 turns of the second wire 52, or may exist at or above the position of the 3.0 turns of the second wire 52.

[0065] ·The second wire 52 may not have a portion wound from the outside with respect to the first wire 51. For example, on the outer peripheral surface of the winding core portion 11, in the direction along the central axis C, the first wire 51, the second wire 52, the first wire 51, the second wire 52... may be alternately positioned. Even in this case, if the position A1 of the 1.0 turn of the first wire 51 and the position B1 of the 1.0 turn of the second wire 52 are separated, the effect of (1) can be obtained.

[0066] ·In the above embodiment, the position of the 3.0 turns of the second wire 52 may not be located between the position of the 2.0 turns and the position of the 3.0 turns of the first wire 51. For example, the position of the 3.0 turns of the second wire 52 may be located between the position of the 3.0 turns and the position of the 4.0 turns of the first wire 51. In this regard, the same applies to other turns. In order to obtain the effect described in the above (4), the following configuration is preferably adopted. When M is a specific integer of 4 or more and N is an arbitrary integer of 3 or more and less than M, it is assumed that the first wire 51 and the second wire 52 have the M-th turn but do not have the (M + 1)-th turn. At this time, in the direction along the central axis C, it is preferable that the position of the N turns of the second wire 52 is located between the position of the (N - 1)-th turn and the position of the N-th turn of the first wire 51.

[0067] · In the above embodiment, a part of the range of 1.0 turn or more and less than 2.0 turns of the first wire 51 may be in contact with the range of 1.0 turn or more and less than 2.0 turns of the second wire 52. If the position A1 of 1.0 turn of the first wire 51 is separated from the position B1 of 1.0 turn of the second wire 52 in the direction along the central axis C, the effect of (1) can be obtained.

[0068] · In the above embodiment, in the direction along the central axis C, the position B2 of 2.0 turns of the second wire 52 may not be located between the position A1 of 1.0 turn of the first wire 51 and the position B1 of 1.0 turn of the second wire 52.

[0069] · Further, if the position A1 of 1.0 turn of the first wire 51 and the position B1 of 1.0 turn of the second wire 52 are separated from each other in the direction along the central axis C, the winding method of each wire does not matter. For example, the position B1 of 1.0 turn of the second wire 52 may be located on the first negative direction X2 side with respect to the position A1 of 1.0 turn of the first wire 51. Between the position A1 of 1.0 turn of the first wire 51 and the position B1 of 1.0 turn of the second wire 52, the second turn or later of the first wire 51 or the third turn or later of the second wire 52 may be located.

[0070] · The coil component 10 may be manufactured in a process and order different from the above embodiment. · In the above embodiment, the manufacturing method of the drum core 10C prepared in the preparation process is not limited to the example of the above embodiment. For example, the drum core 10C may be formed by grinding a rectangular parallelepiped ferrite core.

[0071] The technical idea derivable from the above embodiment and modification example is described below. [1] A drum core having a columnar core part, a first flange part connected to a first end in a direction along the central axis of the core part, and a second flange part connected to a second end opposite to the first end in the core part, a first electrode located on the outer surface of the first flange part on the positive direction side with respect to the central axis, a second electrode located on the outer surface of the first flange part on the negative direction side with respect to the central axis, a third electrode located on the outer surface of the second flange part on the positive direction side with respect to the central axis, a fourth electrode located on the outer surface of the second flange part on the negative direction side with respect to the central axis, a first wire wound around the core part with a first wire end connected to the first electrode and a second wire end connected to the third electrode, and a second wire wound around the core part in the same direction as the first wire with a first wire end connected to the second electrode and a second wire end connected to the fourth electrode. When tracing the first wire from the first wire end to the second wire end, the location where it first contacts the outer peripheral surface of the core part is defined as the 1.0 turn location of the first wire, and the turn number increases by 1 each time it makes one full turn around the central axis from the first wire end to the second wire end side of the first wire. When tracing the second wire from the first wire end to the second wire end, the location where the angular position around the central axis first coincides with the angular position of the 1.0 turn location of the first wire is defined as the 1.0 turn location of the second wire, and the turn number increases by 1 each time it makes one full turn around the central axis from the first wire end to the second wire end side of the second wire. The 1.0 turn location of the first wire is located on the negative direction side with respect to the central axis and is separated from the 1.0 turn location of the second wire in the direction along the central axis.

[0072] [2] The range of more than 1.0 turn and less than 2.0 turns of the first wire is separated from the range of more than 1.0 turn and less than 2.0 turns of the second wire in the coil component described in [1].

[0073] [3] In the direction along the central axis, between the location of 1.0 turn of the first wire and the location of 1.0 turn of the second wire, there is a location of 2.0 turns of the second wire. The coil component according to [1] or [2].

[0074] [4] When M is a specific integer of 4 or more and N is an arbitrary integer of 3 or more and less than M, the first wire and the second wire have the M - th turn but do not have the (M + 1)-th turn. In the direction along the central axis, the location of N turns of the second wire is located between the location of (N - 1) turns and the location of N turns of the first wire. The coil component according to any one of [1] to [3].

[0075] [5] When tracing the second wire from the first wire end to the second wire end side, when the location where the second wire first rides on the outside of the portion after the 1.0 - turn location of the first wire is defined as the first ride - on location, the first ride - on location exists within the range of 2.0 turns or more and less than 3.0 turns of the second wire. The coil component according to any one of [1] to [4].

[0076] [6] The second wire has an intersection location that intersects the portion of the first wire from the first wire end to the 1.0 - turn location from the outside. The intersection location exists within the range of 1.0 turn or more and less than 2.0 turns of the second wire. The coil component according to any one of [1] to [5].

[0077] [7] The intersection location is located on the negative - direction side with respect to the central axis. The coil component according to [6].

Explanation of Signs

[0078] C… Central axis Y… Second axis Y1… Second positive direction Y2… Second negative direction 10… Coil component 10C… Drum core 11… Bobbin part 20… First flange part 30…Second flange 41…First electrode 42…Second electrode 43…Third electrode 44…Fourth electrode 51…First wire 51A…First wire end 51B…Second wire end 52…Second wire 52A…First wire end 52B…Second wire end

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; When a specific direction perpendicular to the central axis is defined as a positive direction and a direction opposite to the positive direction is defined as a negative direction, a first electrode located on an outer surface of the first flange portion on the positive side with respect to the central axis; a second electrode located on an outer surface of the first flange portion on the negative side with respect to the central axis; a third electrode located on an outer surface of the second flange portion on the positive side with respect to the central axis; a fourth electrode located on an outer surface of the second flange portion on the negative side with respect to the central axis; a first wire wound around the winding core, the first wire end being connected to the first electrode and the second wire end being connected to the third 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 electrode, and a second wire end connected to the fourth electrode; Equipped with When tracing the first wire from the first wire end to the second wire end, a point where the first wire first comes into contact with an outer circumferential surface of the winding core is defined as a point of 1.0 turn of the first wire, and 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, When tracing the second wire 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, and the number of turns of the second wire increases by one for each revolution around the central axis from the first wire end toward the second wire end, a 1.0 turn point of the first wire is located on the negative side of the central axis and is spaced apart from a 1.0 turn point of the second wire in a direction along the central axis; In a direction along the central axis, a portion of 2.0 turns of the second wire is located between a portion of 1.0 turns of the first wire and a portion of 1.0 turns of the second wire. Coil parts.

2. When M is a specific integer of 4 or more, and N is an arbitrary integer of 3 or more but less than M, the first wire and the second wire have an M-th turn but do not have an (M+1)-th turn, In a direction along the central axis, a location of the Nth turn of the second wire is located between a location of the (N-1)th turn and a location of the Nth turn of the first wire. The coil component according to claim 1 .

3. When the second wire is traced from the first wire end to the second wire end side, a point where the second wire first runs onto the outside of a portion of the first wire after a point of 1.0 turn is defined as an initial run-up point. The initial run-on point is present within a range of 2.0 turns or more and less than 3.0 turns of the second wire. The coil component according to claim 1 .

4. the second wire has an intersection point that intersects from outside a portion of the first wire from the first wire end to a point of 1.0 turn, The intersection is present within a range of 1.0 turn or more and less than 2.0 turns of the second wire. The coil component according to claim 1 .

5. The intersection point is on the negative side of the central axis The coil component according to claim 4 .

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