Coil parts

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 technology]

[0002] The coil component described in Patent Document 1 includes a winding core and two flanges. The winding core is rectangular prism-shaped. The two flanges are connected to both ends of the winding core. Each flange protrudes outward from the winding core in a direction perpendicular to the central axis of the winding core. The winding core and the flanges are made of a magnetic material. The winding core and the flanges form a core of the coil component. The coil component also includes first to fourth electrodes. The first and second electrodes are located on an upper surface of one of the flanges. The third and fourth electrodes are located on an upper surface of the other flange.

[0003] The 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 winding core. The second wire is wound around the winding core. A first end of the first wire is thermocompression bonded to a first electrode. A second end of the first wire is thermocompression bonded to a third electrode. A first end of the second wire is thermocompression bonded to a second electrode. A second end of the second wire is thermocompression bonded to a fourth electrode. When the number of turns of each wire increases by one each time it goes around the winding core from the first end side to the second end side, the first turn of the first wire and the first turn of the second wire are adjacent to each other in a direction along the central axis of the winding core. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-11288 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the coil component described in Patent Document 1, the electrodes and wires are bonded by thermocompression. During the thermocompression bonding, the coating film of each wire may be deteriorated by the influence of heat. In particular, the part of each wire close to the electrode is easily affected by heat.

[0006] Furthermore, if a potential difference occurs between the first wire and the second wire at a location where the first wire and the second wire are adjacent to each other, a relatively large electric field is generated between the two wires. If the location where the wire coating film is deteriorated coincides with the location where a large electric field is generated between the two wires, a current leak may occur at that location. In other words, the withstand voltage characteristics of the coil component may be degraded.

[0007] Although the above describes an example in which the wire is thermocompression-bonded to the electrode, if the coating film is subject to deterioration when the wire is connected to the electrode, the same problem will arise regardless of the manner of connection. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a drum core having a columnar winding core, a first flange connected to a first end in a direction along a central axis of the winding core, and a second flange connected to a second end of the winding core opposite to the first end; 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 the positive side of the central axis on an outer surface of the first flange, a second electrode located on the negative side of the central axis on the outer surface of the first flange, a third electrode located on the positive side of the central axis on the outer surface of the second flange, a fourth electrode located on the negative side of the central axis on the outer surface of the second flange, a first wire wound around the winding core, a first wire end connected to the first electrode and a second wire end connected to the third electrode; and and a second wire wound around the winding core in the same direction as the first wire end, having a first wire end connected to the second electrode and a second wire end connected to the fourth electrode, wherein when the first wire is traced 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 1.0 turn point 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 side, and when the second wire is traced from the first wire end to the second wire end, a point where an angular position about the central axis first coincides with the angular position of the 1.0 turn point of the first wire is defined as a 1.0 turn point 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 side, the 1.0 turn point of the first wire is located on the negative side of the central axis, and The range of the first wire is 1.0 turn or more and less than 2.0 turns, relative to the range of the second wire is 1.0 turn or more and less than 2.0 turns. Away in the direction along the central axis and 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 in a direction along the central axis. It is a coil component.

[0009] In the above configuration, depending on the direction of the current flowing through each wire, a relatively large potential difference occurs between the 1.0 turn of the first wire and the 1.0 turn of the second wire. In the above configuration, the electric field generated between the 1.0 turn of each wire is smaller than in a configuration in which the 1.0 turn of the first wire and the 1.0 turn of the second wire are wound adjacent to each other. As a result, it is possible to suppress a decrease in the withstand voltage characteristics of the coil component. Effect of the Invention

[0010] Suppresses the deterioration of the voltage resistance characteristics of coil components. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a coil component. [Diagram 2] FIG. 2 is a plan view of the coil component when viewed in the third negative direction. [Diagram 3] FIG. 3 is a side view of the coil device when viewed in the second forward direction. [Figure 4] FIG. 4 is a plan view of the coil device when viewed in the third positive direction. [Diagram 5] FIG. 5 is a side view of the coil component when viewed in the second negative direction. [Figure 6] FIG. 6 is a partial cross-sectional view of the coil component, taken along a cross section including the central axis of the winding core, a location of 1.0 turn of the first wire, and a location of 1.0 turn of the second wire. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of a coil component will be described. In the drawings, components may be shown enlarged to facilitate understanding. The dimensional ratios of the components may differ from those in the actual product or from those in other drawings.

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

[0014] The drum core 10C has a winding core portion 11, a first flange portion 20, and a second flange portion 30. The winding core 11 is in the shape of a quadrangular prism. A cross section perpendicular to the central axis C of the winding core 11 is in the shape of a rectangle. 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. The material of the winding core 11 is a non-conductive material. Specifically, the material of the winding core 11 is, for example, alumina, Ni-Zn ferrite, resin, a mixture thereof, or the like.

[0015] Here, a specific axis parallel to the central axis C of the winding core 11 is defined as the first axis X. A specific 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. Moreover, one of the directions along the third axis Z is defined as a third positive direction Z1, and the direction opposite to the third positive direction Z1 is defined as a third negative direction Z2.

[0016] As shown in Fig. 1, the first flange portion 20 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 20 has a generally rectangular plate shape that is flattened in the direction along the first axis X. When viewed in the direction along the first axis X, each side of the first flange portion 20 is parallel to each side of the winding core portion 11. In addition, the first flange portion 20 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.

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

[0018] The first outer end surface 22 and the first inner end surface 23 are surfaces perpendicular to the central axis C. The first bottom surface 26 and the first top surface 27 are surfaces parallel to the central axis C. The first bottom surface 26 and the first top surface 27 are also surfaces parallel to a mounting surface that faces a 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 perpendicular to the first bottom surface 26.

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

[0020] The second flange portion 30 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 30 has a symmetrical shape to the first flange portion 20 in the direction along the first axis X. That is, the second flange portion 30 has a substantially rectangular plate shape.

[0021] Here, of the second flange 30, a surface facing the first negative direction X2 is referred to as a second outer end surface 32, and a surface facing the first positive direction X1 is referred to as a second inner end surface 33. Moreover, of the second flange 30, a surface facing the second positive direction Y1 is referred to as a third side surface 34, and a surface facing the second negative direction Y2 is referred to as a fourth side surface 35. Moreover, of the second flange 30, a surface facing the third positive direction Z1 is referred to as a second bottom surface 36, and a surface facing the third negative direction Z2 is referred to as a second top surface 37.

[0022] The second outer end surface 32 and the second inner end surface 33 are planes perpendicular to the central axis C. The second bottom surface 36 and the second top surface 37 are surfaces parallel to the central axis C. In addition, the second bottom surface 36 and the second top surface 37 are surfaces parallel to the mounting surface that faces the substrate when the coil component 10 is mounted on the substrate. The third side surface 34 and the fourth side surface 35 are surfaces parallel to the central axis C and perpendicular to the second bottom surface 36.

[0023] The second flange portion 30 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. The second flange portion 30 also has a recessed portion 31. The recessed portion 31 is recessed relative to a second bottom surface 36 of the second flange portion 30.

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

[0025] The top plate 12 is 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 third negative direction Z2 side with respect to the drum core 10C. The top plate 12 is connected to both the first top surface 27 of the first flange portion 20 and the second top surface 37 of the second flange portion 30. In other words, 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 that of the winding core portion 11. Note that in FIG. 2 and subsequent figures, the top plate 12 is not shown.

[0026] The coil device 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. The first electrode 41 is also 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. In addition, 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. The third electrode 43 is also 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. Furthermore, 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] The first electrode 41 to the 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 is made up of three layers. The plating layer is formed by stacking copper, nickel, and tin in this order on the surface of the metal layer. In FIG. 1, the boundaries between the metal layer and the plating layer are not shown. The end face of the coil component 10 on the third positive direction Z1 side is a mounting surface that faces the board when the coil component 10 is mounted on the board.

[0031] <Regarding the first and second wires> 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 winding core 11. Although not shown, the first wire 51 includes 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 shape in a cross section perpendicular to the direction in which the first wire 51 extends. The outer diameter of the first wire 51 is approximately 100 μm. The second wire 52 has the same configuration as the first wire 51. That is, the second wire 52 includes a copper wire and an insulating coating. The outer diameter of the second wire 52 is approximately 100 μm. In FIG. 1, the first wire 51 is colored with dots.

[0032] 2, a first wire end 51A of the first wire 51 is connected to the first electrode 41. A 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 the first wire 51 is traced from the first wire end 51A to the second wire end 51B, a location that first comes into contact with the outer circumferential surface of the winding core portion 11 is defined as a 1.0 turn location A1 of the first wire 51. In this embodiment, the 1.0 turn location A1 of the first wire 51 is located on the second negative direction Y2 side and on the ridge line on the third positive direction Z1 side of the winding core portion 11. In other words, the 1.0 turn location A1 of the first wire 51 is located on the second negative direction Y2 side with respect to the central axis C.

[0034] Furthermore, the number of turns of the first wire 51 increases by one each time the first wire 51 makes one revolution around the central axis C from the first wire end 51A to the second wire end 51B. The first wire 51 is wound around the winding core 11 so as to progress clockwise as the number of turns increases when viewed in the first negative direction X2. Therefore, for example, when viewed in the first negative direction X2, a position that progresses 36 degrees around the central axis C from the position A1 of the 1.0 turn of the first wire 51 is the position of the 1.1 turn of the first wire 51.

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

[0036] Here, when the second wire 52 is traced from the first wire end 52A to the second wire end 52B, the first point whose angular position about the central axis C coincides with the angular position of the 1.0 turn point A1 of the first wire 51 is defined as the 1.0 turn point B1 of the second wire 52. That is, in this embodiment, the 1.0 turn point B1 of the second wire 52 is located on a straight line connecting the ridge line of the winding core 11 on the second negative direction Y2 side and the third positive direction Z1 side and the central axis C when viewed in a direction along the first axis X. Note that, in this embodiment, when the second wire 52 is traced from the first wire end 52A to the second wire end 52B, the 1.0 turn point B1 of the second wire 52 is the first to come into contact with the outer circumferential surface of the winding core 11. Note that the 1.0 turn point B1 of the second wire 52 does not have to come into contact with the outer circumferential surface of the winding core 11.

[0037] Also, the number of turns of the second wire 52 increases by one each time the second wire 52 makes one revolution around the central axis C from the first wire end 52A to the second wire end 52B. When viewed in the first negative direction X2, the second wire 52 is wound around the winding core 11 so as to progress clockwise as the number of turns increases. That is, the second wire 52 is wound in the same direction as the first wire 51. A portion of the second wire 52 is wound around the winding core 11 from the outside relative to the first wire 51. In other words, a portion of the second wire 52 is in contact with the outer surface of the first wire 51 on the opposite side to the central axis C.

[0038] <About the first and second wire turns> 3 to 5, the first wire 51 has a 9th turn but does not have a 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. Furthermore, the first wire 51 is wound directly around the outer circumferential surface of the winding core 11 over substantially the entire range from the 1.0 turn portion A1 to the 9.0 turn portion.

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

[0040] The second wire 52 has a first intersection point CP1 that intersects from the outside with a portion of the first wire 51 from the first wire end 51A to the 1.0 turn point A1. The first intersection point CP1 exists within a range of 1.0 turn or more and less than 2.0 turns of the second wire 52. Specifically, the first intersection point CP1 is a point of approximately 1.8 turns of the second wire 52. The first intersection point CP1 is located on the second negative direction Y2 side with respect to the central axis C. In this embodiment, the "intersection point" refers to a point where the center line of the second wire 52 crosses the center line of the first wire 51 when viewed in a direction perpendicular to the outer circumferential surface of the winding core portion 11, i.e., in the third negative direction Z2.

[0041] 3, the 2.0 turn location B2 of the second wire 52 is adjacent to the 1.0 turn location B1 of the second wire 52 in the direction along the central axis C. The 2.0 turn location B2 of the second wire 52 is located between the 1.0 turn location A1 of the first wire 51 and the 1.0 turn location B1 of the second wire 52 in the direction along the central axis C. In other words, the 1.0 turn location A1 of the first wire 51 is separated from the 1.0 turn location B1 of the second wire 52 in the direction along the central axis C.

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

[0043] Here, when the second wire 52 is traced from the first wire end 52A to the second wire end 52B, the first place where the second wire 52 first rides on the outside of the portion of the first wire 51 after the 1.0 turn point A1 is defined as the first ride-on point F. The first ride-on point F exists within a range of 2.0 turns or more and less than 3.0 turns of the second wire 52. Specifically, the first ride-on point F is located at a point of about 2.7 turns of the second wire 52. In this embodiment, the first place where the center line of the second wire 52 first positions outside the center line of the first wire 51 is defined as the ride-on point. The "center line of the wire" is a line passing through the geometric center of a cross section perpendicular to the extension direction of the wire. That is, in the part where the wire is wound around the winding core 11, the center line of the wire extends in the winding direction. The "outside" in the above description corresponds to the outside in the circumferential direction centered on the central axis C.

[0044] 2, the second wire 52 has a second intersection point CP2 that intersects from the outside with a portion of the first wire 51 from the 1.0 turn point A1 to the 2.0 turn point. The second intersection point CP2 is present within a range of 2.0 turns or more and less than 3.0 turns of the second wire 52. Specifically, the second intersection point CP2 is at a point of approximately 2.9 turns of the second wire 52.

[0045] 6, the coil device 10 is viewed in cross section including the central axis C, the 1.0 turn location A1 of the first wire 51, and the 1.0 turn location B1 of the second wire 52. In the direction along the central axis C, from the first flange 20 side to the second flange 30 side, the 1.0 turn location B1 of the second wire 52, the 2.0 turn location B2 of the second wire 52, the 1.0 turn location A1 of the first wire 51, and the 2.0 turn location 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 3.0 turn portion of the second wire 52 is located between the 2.0 turn portion and the 3.0 turn portion of the first wire 51. In addition, in the direction along the central axis C, the 4.0 turn portion of the second wire 52 is located between the 3.0 turn portion and the 4.0 turn portion of the first wire 51. In addition, the subsequent turns of the second wire 52 are similarly wound between the first wires 51. In other words, when N is an arbitrary integer equal to or greater than 3 and less than 9, in the direction along the central axis C, the N turn portion of the second wire 52 is located between the (N-1) turn portion and the N turn portion of the first wire 51.

[0047] <Manufacturing method of coil parts> The method for manufacturing the coil device 10 includes a preparation step, a first step, and a second step. In the preparation step, 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, ferrite powder is mixed with a synthetic resin binder, and the molded body formed by press molding is fired. Then, the molded body is deburred by a barrel to form the drum core 10C. Next, 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 in the drum core 10C. Each electrode is formed by plating the paste with copper, nickel, and tin in that order.

[0049] Next, in a first step, the first wire 51 is wound around the winding core 11 from the first flange 20 side toward the second flange 30 side. 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 peel off. Similarly, the insulating coating near the second wire end 51B of the first wire 51 may peel off.

[0050] Next, in the second step, the second wire 52 is wound around the outer periphery of the winding core 11 and the first wire 51. Specifically, the first turn of the second wire 52 is started to be wound around the outer periphery of the winding core 11. Then, in the middle of the first turn of the second wire 52, the second wire 52 is wound from the outside of the first wire 51 in a section from the first wire end 51A of the first wire 51 to the 1.0 turn point A1. This forms a first intersection point CP1. Next, a part of the second turn of the second wire 52 is wound around the outer periphery of the winding core 11. Then, in the middle of the second turn of the second wire 52, the second wire 52 is caused to ride up on the outside of the first turn of the first wire 51. This forms an initial ride-up point F. Then, in the middle of the second turn of the second wire 52, the second wire 52 is wound while approaching the second flange 30 side, so that the second wire 52 crosses the first wire 51 again. As a result, the second intersection 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 peel off. Similarly, the insulating coating near the second wire end 52B of the second wire 52 may peel off.

[0051] <Effects of this embodiment> (1) In a common mode choke coil such as that of the above embodiment, a relatively large potential difference occurs between the 1.0 turn location A1 of the first wire 51 and the 1.0 turn location B1 of the second wire 52 depending on the direction of the current flowing through the first wire 51 and the second wire 52. In the above embodiment, the electric field generated between the 1.0 turn locations of the wires is smaller than in a configuration in which the 1.0 turn location A1 of the first wire 51 and the 1.0 turn location B1 of the second wire 52 are wound adjacent to each other. As a result, it is possible to suppress a decrease in the withstand voltage characteristics of the coil device 10.

[0052] In particular, when the wire ends of the wires are connected to the electrodes by thermocompression bonding, the insulation coating of the wires may deteriorate near the wire ends. In some cases, the deterioration of the insulation coating may extend to the 1.0 turn of each wire. In other words, when the wire ends of the wires are connected by thermocompression bonding, there is a high possibility that the location where the insulation coating has deteriorated will coincide with the location where a large electric field is generated between the two wires. Thus, the configuration of the above embodiment is particularly useful for coil components 10 that have a thermocompression bonding process in their manufacturing process.

[0053] (2) In the above 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 are not in contact over a wide range, such as 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 more effectively reduced.

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

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

[0056] (5) In the above embodiment, the initial ride-on location F is in the range of 2.0 turns or more and less than 3.0 turns of the second wire 52. In other words, the second wire 52 is wound outwardly with respect to the first wire 51 at an early stage after the 2.0 turn location B2. With this configuration, it is not necessary to secure a large space on the outer circumferential surface of the winding core portion 11 for winding the second wire 52.

[0057] (6) In the above embodiment, the first intersection point CP1 exists within a range of 1.0 turn or more and less than 2.0 turns of the second wire 52. According to the above configuration, the point B2 of the 2.0 turns of the second wire 52 can be reliably disposed between the point A1 of the 1.0 turn of the first wire 51 and the point B1 of the 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, the first intersection point CP1 is located closer to the winding core portion 11 than in a configuration in which the first intersection point CP1 is located on the second positive direction Y1 side with respect to the central axis C. By locating the first intersection point CP1 at a position closer to the winding core portion 11, the position of the first intersection point CP1 is less likely to shift.

[0059] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.

[0060] In the above embodiment, the configuration of the coil component 10 is not limited. For example, the coil component 10 may be provided without the top plate 12. Furthermore, 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 may be provided without the recessed portion 21.

[0061] In the above embodiment, the winding core 11 does not have to be in the shape of a rectangular prism. For example, the cross-sectional shape of the winding core 11 may be a circle, an ellipse, or a polygon other than a rectangle. In the above embodiment, the ridges of the winding core portion 11 may be chamfered. That is, the boundaries of the outer circumferential surfaces include curved surfaces formed, for example, by R-chamfering corners that form adjacent flat surfaces.

[0062] In the above embodiment, the shape and dimensions of the drum core 10C are not limited to the examples in the above embodiment. In the above embodiment, the material of each electrode is not limited to the example of the above embodiment. For example, the material of the plating layer of 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 in 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. Also, the second wire 52 may not have the first intersection point CP1. That is, the 2.0 turn point B2 of the second wire 52 may be located on the first negative direction X2 side with respect to the 1.0 turn point A1 of the first wire 51.

[0064] In the above embodiment, the initial run-on point F is not limited to the position in the above embodiment. That is, the initial run-on point F may be located less than the point B2 of 2.0 turns of the second wire 52, or may be located at a point of 3.0 turns or more of the second wire 52.

[0065] The second wire 52 does not have to have a portion wound around the first wire 51 from the outside. For example, the first wire 51, the second wire 52, the first wire 51, the second wire 52, ... may be positioned alternately on the outer circumferential surface of the winding core portion 11 in the direction along the central axis C. Even in this case, the effect of (1) can be obtained as long as the 1.0 turn location A1 of the first wire 51 and the 1.0 turn location B1 of the second wire 52 are separated from each other.

[0066] In the above embodiment, the 3.0 turn portion of the second wire 52 may not be located between the 2.0 turn portion and the 3.0 turn portion of the first wire 51. For example, the 3.0 turn portion of the second wire 52 may be located between the 3.0 turn portion and the 4.0 turn portion of the first wire 51. This point is similar to other turns. In order to obtain the effect described in (4) above, the following configuration is preferable. 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 51 and the second wire 52 have M turns but do not have (M+1) turns. In this case, it is preferable that the N turn portion of the second wire 52 is located between the (N-1) turn portion and the N turn portion of the first wire 51 in the direction along the central axis C.

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

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

[0069] Furthermore, as long as the 1.0 turn location A1 of the first wire 51 and the 1.0 turn location B1 of the second wire 52 are separated in the direction along the central axis C, there is no restriction on the manner in which the wires are wound. For example, the 1.0 turn location B1 of the second wire 52 may be located on the first negative direction X2 side relative to the 1.0 turn location A1 of the first wire 51. The second or subsequent turn of the first wire 51 or the third or subsequent turn of the second wire 52 may be located between the 1.0 turn location A1 of the first wire 51 and the 1.0 turn location B1 of the second wire 52.

[0070] The coil device 10 may be manufactured in a process and order different from those in the above embodiment. In the above embodiment, the manufacturing method of the drum core 10C prepared in the preparation step 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 ideas that can be derived from the above-described embodiments and modifications will be described below. [1] A drum core having a columnar winding core, a first flange connected to a first end of the winding core in a direction along a central axis, and a second flange connected to a second end of the winding core opposite to the first end, and a first electrode located on the positive side of the central axis on an outer surface of the first flange, 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, the first electrode located on the positive side of the central axis on an outer surface of the first flange, and a second electrode located on the negative side of the central axis on an outer surface of the first flange a second electrode located on the positive side of the central axis on an outer surface of the second flange; a fourth electrode located on the negative side of the central axis on an outer surface of the second flange; a first wire wound around the winding core and having 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 winding core in the same direction as the first wire and having a first wire end connected to the second electrode and a second wire end connected to the fourth electrode. a 1.0 turn point of the first wire is defined as a point where the first wire first comes into contact with an outer peripheral surface of the winding core when the first wire is traced from the first wire end to the second wire end, and the number of turns of the first wire increases by one for each revolution around the central axis from the first wire end to the second wire end, and a 1.0 turn point of the second wire is defined as a point where an angular position about the central axis first matches an angular position of the 1.0 turn point of the first wire when the second wire is traced from the first wire end to the second wire end, and the number of turns increases by one for each revolution around the central axis from the first wire end to the second wire end, wherein the 1.0 turn point of the first wire is located on the negative side of the central axis and is away from the 1.0 turn point of the second wire in a direction along the central axis.

[0072] [2] The coil component according to [1], wherein the range of the first wire is 1.0 turn or more and less than 2.0 turns, is separated from the range of the second wire is 1.0 turn or more and less than 2.0 turns.

[0073] [3] A coil component as described in [1] or [2], wherein, in a direction along the central axis, a 2.0 turn point of the second wire is located between a 1.0 turn point of the first wire and a 1.0 turn point of the second wire.

[0074] [4] A coil component according to any one of [1] to [3], wherein, when M is a specific integer equal to or greater than 4 and N is an arbitrary integer equal to or greater than 3 and less than M, the first wire and the second wire have an Mth turn but do not have an (M+1)th turn, and in the direction along the central axis, the location of the Nth turn of the second wire is located between the location of the (N-1)th turn and the location of the Nth turn of the first wire.

[0075] [5] A coil component according to any one of [1] to [4], wherein when the second wire is traced from the first wire end to the second wire end, the point where the second wire first runs over the outside of a portion of the first wire after the 1.0 turn point is defined as an initial run-over point, and the initial run-over point is located within a range of 2.0 turns or more and less than 3.0 turns of the second wire.

[0076] [6] A coil component according to any one of [1] to [5], wherein the second wire has an intersection point where it intersects from the outside with a portion of the first wire from the first wire end to a point 1.0 turn away from the first wire end, and the intersection point is located within a range of 1.0 turn or more and less than 2.0 turns of the second wire.

[0077] [7] The coil component according to [6], wherein the intersection is located on the negative side of the central axis. [Explanation of symbols]

[0078] C…Central axis Y...Second axis Y1…Second positive direction Y2…Second negative direction 10...Coil parts 10C…Drum core 11...Core 20…First flange 30…Second flange 41...1st electrode 42…Second electrode 43...Third electrode 44…4th electrode 51…First wire 51A…1st line end 51B…Second line end 52…Second wire 52A…First line end 52B…Second line 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 portion of the first wire having a 1.0 turn is located on the negative side of the central axis, and a portion of the first wire having a turn of 1.0 or more and less than 2.0 turns is spaced apart in a direction along the central axis from a portion of the second wire having a turn of 1.0 or more and less than 2.0 turns; 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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