Coil components

Abstract

When the second wire intersects with the first wire, there is a tendency for gaps to form near the intersection where the second wire is not wound. [Solution] The 35th turn of the second wire 60 has a first intersection point CR1 that intersects the 35th turn of the first wire 50 from the outside. The 36th turn of the second wire 60 has a specific portion SP located between the 35th turn of the first wire 50 and the 35th turn of the second wire 60 in a direction along the central axis of the winding core 11. The 36th turn of the second wire has a third intersection point CR3 that intersects the 35th turn of the second wire from the outside, on the second wire end 62 side of the specific portion SP.

Description

【Technical Field】 【0001】 The present invention relates to a coil component. 【Background Art】 【0002】 The common mode filter described in Patent Document 1 includes a drum-shaped core, a first wire, and a second wire. The drum-shaped core has a rectangular prism-shaped winding core portion, a first flange portion provided at a first end of the winding core portion, and a second flange portion provided at a second end of the winding core portion. The first wire is wound around the winding core portion. The second wire is wound around the winding core portion from the outside with respect to the first wire. Also, a predetermined turn of the second wire has an intersection portion that intersects the first wire. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2018-120885 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the common mode filter as described in Patent Document 1, the first wire and the second wire are basically wound around the winding core portion in a spiral shape with the same pitch. However, in the vicinity of such an intersection portion, each wire is wound at a pitch different from other portions. Therefore, in the direction along the central axis of the winding core portion, a space where the second wire is not wound easily occurs in the vicinity of the intersection portion of the second wire. Such a space hinders the high-density winding of the second wire. 【Means for Solving the Problems】 【0005】 One embodiment for solving the above problem comprises a columnar winding core, a first flange provided at a first end of the winding core in a direction along the central axis, a second flange provided at a second end of the winding core opposite to the first end, a first external electrode and a second external electrode provided at the first flange, a third external electrode and a fourth external electrode provided at the second flange, a first wire wound around the winding core with a first end connected to the first external electrode and a second end connected to the third external electrode, and a second wire wound around the winding core in the same direction as the first wire with a first end connected to the second external electrode and a second end connected to the fourth external electrode, wherein the first wire and the second wire With respect to the wire, assuming that the number of turns increases by 1 for each revolution around the central axis from the first wire end towards the second wire end, the j-th turn of the second wire (where j is an integer of 2 or more) has a first intersection point that intersects the i-th turn of the first wire (where i is an integer of 2 or more) from the outside, the (j+1)-th turn of the second wire has a specific portion located between the i-th turn of the first wire and the j-th turn of the second wire in the direction along the central axis of the winding core, and the (j+1)-th turn of the second wire is a coil component that intersects the j-th turn of the second wire from the outside, closer to the second wire end than the specific portion. [Effects of the Invention] 【0006】 In the direction along the central axis, the space where the second wire is not wound near the intersection of the second wires can be reduced. [Brief explanation of the drawing] 【0007】 [Figure 1] Figure 1 is a perspective view of a coil component. [Figure 2] Figure 2 shows the winding structure of each wire, and is a schematic end view of the coil component at the end faces perpendicular to the left and right axes, including the central axis. [Figure 3] Figure 3 is a magnified view of a portion of Figure 2. [Figure 4]Figure 4 is a schematic top view of a coil component showing the winding structure of each wire. [Figure 5] Figure 5 is a schematic top view of a modified coil component. [Modes for carrying out the invention] 【0008】 <An embodiment of a coil component> The following describes one embodiment of a coil component. Note that the drawings may be enlarged to facilitate understanding of the components. The dimensional ratios of the components may differ from those in the actual components or those shown in other drawings. 【0009】 (Regarding the overall structure) As shown in Figure 1, the coil component 10 comprises a drum core 10C and a plate core 10F. 【0010】 The drum core 10C has a winding core portion 11, a first flange portion 21, and a second flange portion 31. The core portion 11 has a rectangular cross-section, forming a rectangular prism shape. That is, the core portion 11 has four sides. The material of the core portion 11 is, for example, Ni-Zn ferrite. 【0011】 The first flange portion 21 is provided at the first end of the winding core portion 11 in the direction along the central axis C. Specifically, the first flange portion 21 is connected to the first end of the winding core portion 11 in the direction along the central axis C. The second flange portion 31 is provided at the second end of the winding core portion 11 in the direction along the central axis C. Specifically, the second flange portion 31 is connected to the second end of the winding core portion 11 in the direction along the central axis C. The material of the first flange portion 21 and the second flange portion 31 is the same as that of the winding core portion 11. Furthermore, the first flange portion 21 and the second flange portion 31 are integrally molded with the winding core portion 11. 【0012】 Here, the axis parallel to the central axis C is defined as the core axis X. A specific axis perpendicular to the core axis X is defined as the vertical axis Y. In this embodiment, the vertical axis Y extends in a direction perpendicular to the mounting surface when mounting the coil component 10 to the substrate. The axis perpendicular to both the core axis X and the vertical axis Y is defined as the left-right axis Z. One of the directions along the core axis X is defined as the positive direction X1, and the direction opposite to the positive direction X1 is defined as the negative direction X2. In this embodiment, the positive direction X1 coincides with the direction from the winding core portion 11 toward the first flange portion 21. The negative direction X2 coincides with the direction from the winding core portion 11 toward the second flange portion 31. One of the directions along the vertical axis Y is defined as the upward direction Y1, and the direction opposite to the upward direction Y1 is defined as the downward direction Y2. One of the directions along the left-right axis Z is defined as the rightward direction Z1, and the direction opposite to the rightward direction Z1 is defined as the leftward direction Z2. Note that the upward direction Y1 and downward direction Y2 used here are for convenience only and do not specify the direction of gravity. Similarly, the rightward direction Z1 and leftward direction Z2 are also for convenience only and do not specify the left and right directions from a particular viewpoint. 【0013】 The shape of the core portion 11 in a cross-section perpendicular to the central axis C is rectangular. That is, the area of ​​two of the four sides of the core portion 11 is larger than the area of ​​the other two sides. One of the larger side faces upward Y1, and the other larger side faces downward Y2. 【0014】 In the following, as shown in Figure 2, the side facing upward Y1 will be referred to as the specific side 11A, and the side opposite to the specific side 11A will be referred to as the opposite side 11B. Note that the specific side 11A does not necessarily have to be a plane in which the entire area is perpendicular to the vertical axis Y. That is, the specific side 11A is the surface of the winding core 11 that can be seen when viewing the coil component 10 from the upward Y1 side looking downward Y2. Also, as shown in Figure 4, of the two edges between the specific side 11A and the other adjacent side, the edge on the left Z2 side will be referred to as the first edge R1. Also, of the edges between the specific side 11A and the other side, the edge on the right Z1 side will be referred to as the second edge R2. 【0015】 As shown in FIG. 1, when viewed in the direction along the central axis C, the first flange portion 21 protrudes outward with respect to the core portion 11 in the directions along the vertical axis Y and the horizontal axis Z. The first flange portion 21 has a shape that is symmetric with respect to a virtual plane that includes the central axis C and is perpendicular to the horizontal axis Z. 【0016】 The first flange portion 21 has a main body portion 22 and a recessed portion 23. As a whole, the main body portion 22 has a shape of a rectangular parallelepiped with a small thickness in the direction along the central axis C. When viewed in the negative X2 direction, both edges on the upper Y1 side and the lower Y2 side of the main body portion 22 are parallel to the horizontal axis Z. Also, when viewed in the negative X2 direction, both edges on the left Z2 side and the right Z1 side of the main body portion 22 are parallel to the vertical axis Y. 【0017】 The recessed portion 23 is recessed downward in the Y2 direction from the upper surface of the main body portion 22. The recessed portion 23 has a smaller dimension in the direction along the horizontal axis Z as it goes downward in the Y2 direction. The recessed portion 23 is located substantially at the center in the direction along the horizontal axis Z of the main body portion 22. The dimension of the recessed portion 23 in the direction along the central axis C is the same as the dimension of the main body portion 22 in the direction along the central axis C. That is, a part of the first flange portion 21 on the upper Y1 side has a shape that is bifurcated with the recessed portion 23 interposed therebetween. 【0018】 The second flange portion 31 and the first flange portion 21 have a shape that is symmetric with respect to a virtual plane that passes through the center of the core portion 11 in the direction along the central axis C and is perpendicular to the central axis C. That is, when viewed in the direction along the central axis C, the second flange portion 31 protrudes outward with respect to the core portion 11 in the directions along the vertical axis Y and the horizontal axis Z. And the second flange portion 31 has a main body portion 32 and a recessed portion 33. The configurations of the main body portion 32 and the recessed portion 33 of the second flange portion 31 are the same as those of the main body portion 22 and the recessed portion 23 of the first flange portion 21. That is, the recessed portion 33 is recessed downward in the Y2 direction from the upper surface of the main body portion 32. 【0019】 The plate core 10F is in the shape of a rectangular plate. The long side of the plate core 10F is parallel to the central axis C. The short side of the plate core 10F is parallel to the left - right axis Z. The plate core 10F is located on the downward Y2 side with respect to the drum core 10C. The plate core 10F is connected to both the lower surface of the first flange portion 21 and the lower surface of the second flange portion 31. That is, the plate core 10F is spanned between the first flange portion 21 and the second flange portion 31. The material of the plate core 10F is the same as that of the drum core 10C. Although not shown in the figure, an adhesive is interposed between the plate core 10F, the first flange portion 21, and the second flange portion 31. 【0020】 As shown in FIG. 1, the coil component 10 includes a first external electrode 41, a second external electrode 42, a third external electrode 43, and a fourth external electrode 44. The first external electrode 41 is provided on the first flange portion 21. That is, the first external electrode 41 is attached on the surface of the first flange portion 21. The first external electrode 41 is on the upward Y1 - side surface of the first flange portion 21 and is located on the left - hand Z2 side with respect to the recessed portion 23. 【0021】 The second external electrode 42 is provided on the first flange portion 21. That is, the second external electrode 42 is attached on the surface of the first flange portion 21. The second external electrode 42 is on the upward Y1 - side surface of the first flange portion 21 and is located on the right - hand Z1 side with respect to the recessed portion 23. 【0022】 The third external electrode 43 is provided on the second flange portion 31. That is, the third external electrode 43 is attached on the surface of the second flange portion 31. The third external electrode 43 is on the upward Y1 - side surface of the second flange portion 31 and is located on the left - hand Z2 side with respect to the recessed portion 33. 【0023】 The fourth external electrode 44 is provided on the second flange portion 31. That is, the fourth external electrode 44 is attached on the surface of the second flange portion 31. The fourth external electrode 44 is on the upward Y1 - side surface of the second flange portion 31 and is located on the right - hand Z1 side with respect to the recessed portion 33. 【0024】 Although not shown in the diagram, these first external electrodes 41 to the fourth external electrodes 44 have a metal layer and a plating layer. The metal layer is, for example, a layer mainly composed of silver. The plating layer consists of multiple layers, such as a layer mainly composed of copper, a layer mainly composed of nickel, and a layer mainly composed of tin. In this embodiment, the surface of the coil component 10 on which the first external electrodes 41 to the fourth external electrodes 44 are provided is the surface that faces the substrate when the coil component 10 is mounted on the substrate. In Figure 1, the first external electrodes 41 to the fourth external electrodes 44 are shown by dashed lines. 【0025】 <Regarding the configuration of the first and second wires> As shown in Figure 1, the coil component 10 comprises a first wire 50 and a second wire 60. These first wire 50 and second wire 60 have portions wound around the winding core 11. In Figure 1, the winding structure of the portions of the first wire 50 and second wire 60 wound around the winding core 11 has been simplified and is shown as if each wire were a cylindrical object with each turn integrated into a single unit. 【0026】 Although not shown in the diagram, the first wire 50 has a conductor and an insulating coating. The insulating coating covers the outer surface of the conductor. The first wire 50 has a roughly circular cross-section perpendicular to the direction in which it extends. The first wire 50 has a first wire end 51 and a second wire end 52 on the opposite side of the first wire end 51. In each figure, the first wire 50 is colored with dots. 【0027】 As shown in Figure 1, the first end 51 of the first wire 50 is connected to the first external electrode 41. The second end 52 of the first wire 50 is connected to the third external electrode 43. Here, when tracing the first wire 50 from the first end 51 to the second end 52, the point where it first contacts the outer surface of the winding core 11 is defined as the 1.0 turn point of the first wire 50. In this embodiment, the 1.0 turn point of the first wire 50 is located on the second ridge line R2 of the winding core 11. 【0028】 As shown in Figure 2, with respect to the first wire 50, the number of turns of the first wire 50 increases by one for each revolution around the central axis C from the first wire end 51 to the second wire end 52. The first wire 50 is wound around the winding core 11 such that, when viewed in the negative direction X2, it progresses clockwise as the number of turns increases. Therefore, as shown in Figure 4, when the first wire 50 is traced from the first wire end 51 to the second wire end 52, it passes over the first ridge R1 and the second ridge R2 in that order on the specific side surface 11A. 【0029】 More specifically, for example, when viewed in the negative direction X2, the point 36 degrees clockwise around the central axis C from the 1.0 turn point of the first wire 50 is the 1.1 turn point of the first wire 50. The first turn of the first wire 50 refers to the section from the 1.0 turn point to just before the 2.0 turn point. The final turn of the first wire 50 is the turn that includes the point where the first wire 50 finally contacts the outer surface of the winding core 11 when traced from the first wire end 51 to the second wire end 52. In Figures 2 to 4, any point within the first turn is indicated as "1". The same applies to other turn counts. Note that the number of turns shown in Figures 2 to 4 may not match the number of turns counted from the start of winding during manufacturing. Also, in Figure 4, each wire on the specific side surface 11A is simplified and shown as a line rather than with thickness. Note that the first wire 50 is shown as a dashed line, and the second wire 60 is shown as a solid line. 【0030】 As shown in Figure 1, the second wire 60 has the same configuration as the first wire 50. That is, the second wire 60 has a conductor and an insulating coating. The insulating coating covers the outer surface of the conductor. The second wire 60 has a substantially circular shape in cross-section perpendicular to the direction in which the second wire 60 extends. The second wire 60 has a first wire end 61 and a second wire end 62 opposite to the first wire end 61. 【0031】 As shown in Figure 1, the first end 61 of the second wire 60 is connected to the second external electrode 42. The second end 62 of the second wire 60 is connected to the fourth external electrode 44. Here, when tracing the second wire 60 from the first end 61 to the second end 62, the point where the angular position around the central axis C first coincides with the angular position of the 1.0 turn of the first wire 50 is defined as the 1.0 turn of the second wire 60. In other words, in this embodiment, the 1.0 turn of the second wire 60 is located on a half-line extending from the central axis C to the second ridge R2 of the winding core 11 when viewed in the direction along the central axis C. 【0032】 As shown in Figure 2, with respect to the second wire 60, the number of turns of the second wire 60 increases by one for each revolution around the central axis C from the first wire end 61 to the second wire end 62. The second wire 60 is wound around the winding core 11 such that, when viewed in the negative direction X2, it progresses clockwise as the number of turns increases. That is, the second wire 60 is wound around the winding core 11 in the same direction as the first wire 50. Therefore, as shown in Figure 4, when the second wire 60 is traced from the first wire end 61 to the second wire end 62, it passes over the first ridge line R1 and the second ridge line R2 in that order on the specific side surface 11A. The method for counting the turns of the second wire 60 is the same as for the first wire 50. 【0033】 In the following, with respect to the first wire 50 and the second wire 60, the portion that is directly wound around the core 11 is referred to as the first layer L1. Here, "directly wound around" means not only that the wire is in contact with the outer surface of the core 11, but also that the wire is floating relative to the core 11, and that it is wound around the core 11 without any other wires in between. 【0034】 Furthermore, with respect to the first wire 50 and the second wire 60, the portion wound from the outside in a direction perpendicular to the central axis C in the valley between adjacent wires of the first layer L1 along the central axis C is defined as the second layer L2. In addition, with respect to the first wire 50 and the second wire 60, the portion wound from the outside in a direction perpendicular to the central axis C in the valley between adjacent wires of the second layer L2 along the central axis C is defined as the third layer L3. 【0035】 <Specific winding structure of the first and second wires> As shown in Figure 2, almost all turns of the first wire 50 belong to the first layer L1. The first wire 50 is wound from the first turn to the 36th turn. That is, the final turn of the first wire 50 is the 36th turn. 【0036】 From the first turn to the 36th turn of the first wire 50, the turns are wound sequentially such that as the number of turns increases, the wire is positioned towards the second flange portion 31 in the direction along the central axis C. Also, from the first turn to partway through the 35th turn of the first wire 50, the turns are wound adjacent to each other in the direction along the central axis C. Then, from partway through the 35th turn to the 36th turn of the first wire 50, the turns are spaced apart from the other turns of the first wire 50 adjacent to the positive direction X1. The second wire 60 is positioned in this spaced-out area, as will be described later. 【0037】 Here, "winding adjacently" does not necessarily mean that the turns of adjacent wires are in contact with each other. Even if the turns of adjacent wires are not in contact with each other, they can be considered adjacent if, when viewed from the end face, no other wire lies on the line segment connecting the centers of adjacent wires. 【0038】 The second wire 60 is wound from the first turn to the 36th turn. That is, the final turn of the second wire 60 is the 36th turn. The majority of the second wire 60 belongs to the second layer L2. However, the second wire 60 also has portions belonging to the first layer L1 and portions belonging to the third layer L3. 【0039】 The portion of the second wire 60 closer to the first wire end 61 than the 1.0 turn is not located on the specific side surface 11A. Therefore, the portion of the second wire 60 closer to the first wire end 61 than the 1.0 turn does not have any points on the specific side surface 11A where it intersects with the first wire 50. Furthermore, the entirety of the first turn of the second wire 60 is located in the valley between the first and second turns of the first wire 50. Therefore, the first turn of the second wire 60 does not have any points on the specific side surface 11A where it intersects with the first wire 50. 【0040】 The second turn of the second wire 60 is located in the valley between the second and third turns of the first wire 50. The third turn of the second wire 60 is located in the valley between the third and fourth turns of the first wire 50. Thus, within the range from the first turn of the second wire 60 to partway through the 19th turn, the nth turn of the second wire 60 is wound in the valley between the nth turn and the (n+1)th turn of the first wire 50, where "n" is an integer between 1 and 19. Therefore, the range from the first turn of the second wire 60 to partway through the 19th turn belongs to the second layer L2. 【0041】 From the middle of the 19th turn of the second wire 60, it is pulled out toward the positive direction X1. Specifically, the portion of the 19th turn of the second wire 60 that is on the opposite side 11B is wound in the valley between the 19th and 20th turns of the first wire 50. After that, the 19th turn of the second wire 60 is pulled out toward the first flange 21, and on the specific side 11A, it is wound in the valley between the 16th and 17th turns of the second wire 60. Therefore, the 19th turn of the second wire 60 intersects with the 18th and 17th turns of the second wire 60 on the side facing left Z2. 【0042】 The 20th turn of the second wire 60 is wound in the valley between the 17th and 18th turns of the second wire 60. Up to the middle of the 21st turn of the second wire 60, it is wound in the valley between the 18th and 19th turns of the second wire 60, and thereafter the 21st turn of the second wire 60 is wound in the valley between the 19th and 20th turns of the first wire 50. Specifically, the portion of the 21st turn of the second wire 60 on the opposite side 11B is wound in the valley between the 18th and 19th turns of the second wire 60. And the portion of the 21st turn of the second wire 60 on a specific side 11A is wound in the valley between the 19th and 20th turns of the first wire 50. Therefore, the 21st turn of the second wire 60 intersects with the 19th turn of the second wire 60 on the side facing left Z2. Thus, the section of the second wire 60 from the middle of the 19th turn to the middle of the 21st turn belongs to the third layer L3. 【0043】 The 22nd turn of the second wire 60 is located in the valley between the 20th and 21st turns of the first wire 50. Similarly, the 23rd turn of the second wire 60 is located in the valley between the 21st and 22nd turns of the first wire 50. Thus, within the range from the 22nd turn of the second wire 60 to partway through the 27th turn, the nth turn of the second wire 60 is wound in the valley between the (n-2)th turn and the (n-1)th turn of the first wire 50. Here, n is an integer between 23 and 27 (inclusive). 【0044】 The 27th turn of the second wire 60 intersects the 26th and 27th turns of the first wire 50 on a specific side surface 11A, moving from the first flange 21 side towards the second flange 31 side. 【0045】 The 28th turn of the second wire 60 is located in the valley between the 28th and 29th turns of the first wire 50. Similarly, the 29th turn of the second wire 60 is located in the valley between the 29th and 30th turns of the first wire 50. Thus, within the range from the 28th turn of the second wire 60 to partway through the 34th turn, the nth turn of the second wire 60 is wound in the valley between the nth turn and the (n+1)th turn of the first wire 50, where n is an integer between 29 and 34. Furthermore, the section from partway through the 21st turn of the second wire 60 to partway through the 34th turn belongs to the second layer L2. 【0046】 As shown in Figure 3, the portion of the 34th turn of the second wire 60 that is located on a specific side surface 11A is directly wound around the core 11 between the 34th and 35th turns of the first wire 50. 【0047】 As shown in Figure 4, the second wire 60 is wound directly around the core 11, adjacent to the 35th turn of the first wire 50 in the negative direction X2, up to partway through the 35th turn. Subsequently, the 35th turn of the second wire 60 has a first intersection point CR1 on a specific side surface 11A, where it intersects the 35th turn of the first wire 50 from the outside. As shown in Figure 3, near this first intersection point CR1, the 35th turn of the second wire 60, which belonged to the first layer L1, rides over the 35th turn of the first wire 50 and becomes the second layer L2. 【0048】 As shown in Figure 4, the portion of the 35th turn of the second wire 60 that is closer to the second wire end 62 than the first intersection point CR1 has a second intersection point CR2 on a specific side surface 11A that intersects with the 34th turn of the second wire 60 from the outside. When tracing the second wire 60 from the first intersection point CR1 to the second intersection point CR2 from the first wire end 61 to the second wire end 62, the second wire 60 extends from the second flange 31 to the first flange 21. In other words, the second intersection point CR2 is located on the positive X1 side with respect to the first intersection point CR1. The portion of the 35th turn of the second wire 60 from the second intersection point CR2 to just before the 36th turn is wound in the valley between the 34th turn of the first wire 50 and the 34th turn of the second wire 60. 【0049】 Up to the middle of the 36th turn of the second wire 60, it is wound in the valley between the 35th turn of the first wire 50 and the 35th turn of the second wire 60. From the middle of the 36th turn of the second wire 60 onward, it is a specific portion SP that is wound directly onto the winding core 11. This specific portion SP is located between the 35th turn of the first wire 50 and the 35th turn of the second wire 60 in the direction along the central axis C of the winding core 11. Furthermore, the specific portion SP includes a portion located on the first ridge line R1 of the winding core 11. 【0050】 The second wire 60 is spaced apart from the side surface of the core 11 on the second wire end 62 side of the specific section SP, and extends to the fourth external electrode 44. The second wire end 62 of the second wire 60 is connected to the fourth external electrode 44. As a result, the 36th turn of the second wire 60 has a third intersection point CR3 that crosses the 35th turn of the second wire 60 from the outside, on the second wire end 62 side of the specific section SP. This third intersection point CR3 is located on the specific side surface 11A. 【0051】 Furthermore, at the third intersection point CR3, the 35th and 36th turns of the second wire 60 are not in contact with each other. That is, at the third intersection point CR3, the 36th turn of the second wire 60 is separated from the 35th turn in the upward direction Y1. Thus, a "crossing point" is defined as a point where, for example, two wires intersect when viewed through a direction perpendicular to a specific side surface 11A; they do not need to be in contact with each other. 【0052】 As described above, the second wire 60 has a first intersection point CR1, a second intersection point CR2, a third intersection point CR3, and other intersection points on a specific side surface 11A. Furthermore, the second wire 60 has intersection points on the side surface of the winding core 11 facing left Z2. On the other hand, the second wire 60 does not have intersection points on the opposite side surface 11B. 【0053】 Here, let i be 35 and j be 35. In this case, the (j+1)th turn of the second wire 60 is the final turn of the second wire 60. Also, when i is 35 and j is 35, the jth turn of the second wire 60 has a first intersection point CR1 that intersects the ith turn of the first wire 50 from the outside. Furthermore, the jth turn of the second wire 60 has a second intersection point CR2 that intersects the (j-1)th turn of the second wire 60 from the outside. In addition, the (j+1)th turn of the second wire 60 has a specific portion SP. This specific portion SP is wound directly around the core 11 and is located between the ith turn of the first wire 50 and the jth turn of the second wire 60 in a direction along the central axis C of the core 11. 【0054】 <Effects of the Embodiment> The above embodiment provides the following effects. (1) In the above embodiment, the 35th turn of the second wire 60 has a first intersection point CR1. In this relationship, space is created around the 35th turn of the second wire 60 in the direction along the central axis C. On the other hand, the 36th turn of the second wire 60 has a specific portion SP. The specific portion SP is wound directly around the winding core 11 and is located between the 35th turn of the first wire 50 and the 35th turn of the second wire 60 in the direction along the central axis C of the winding core 11. In other words, the space on the positive X1 side relative to the 35th turn of the second wire 60 is utilized as space for winding the 36th turn. Such a winding structure contributes to high-density winding of the second wire 60. 【0055】 Furthermore, the 36th turn of the second wire 60 has a third intersection point CR3 that crosses the 35th turn of the second wire 60 from the outside, on the side of the second wire end 62 than the specific section SP. By crossing the second wire 60 again in this way, the second wire end 62 of the second wire 60 can be connected to the fourth external electrode 44. At the third intersection point CR3, the second wire 60 is separated from the first wire 50 in the upward direction Y1, so it is not necessarily required to secure dimensions for the third intersection point CR3 of the second wire 60 in the winding core portion 11 in the direction along the central axis C. 【0056】 (2) In the above embodiment, the specific portion SP of the second wire 60 includes a portion located on the first ridge line R1 of the winding core 11. On the first ridge line R1, the second wire 60 is pressed against the winding core 11 with a relatively strong force. Therefore, according to the above configuration, it is possible to suppress winding collapse around the specific portion SP. 【0057】 (3) In the above embodiment, the final turn of the second wire 60 is the 36th turn. In other words, the first intersection point CR1, the second intersection point CR2, and the third intersection point CR3 are concentrated in the final turn and the turn immediately preceding it of the second wire 60. Therefore, for example, by optically observing the boundary between the winding core 11 and the second flange 31, it is possible to determine which direction a specific side surface 11A of the winding core 11 is facing, that is, the orientation of the coil component 10. 【0058】 (4) In the above embodiment, the first turn of the second wire 60 and the portion of the second wire 60 closer to the first wire end 61 than the first turn do not intersect with the first wire 50 on the specific side surface 11A. On the other hand, as described above, the second wire 60 has multiple intersection points at the boundary between the winding core 11 and the second flange 31. Therefore, the orientation of the coil component 10 can be determined by optically observing each wire on the specific side surface 11A of the winding core 11. 【0059】 (5) In the above embodiment, the portion of the 35th turn of the second wire 60 that is closer to the second wire end 62 than the first intersection point CR1 is wound in the valley between two adjacent turns. Specifically, this portion is wound in the valley between the 34th turn of the first wire 50 and the 34th turn of the second wire 60. Therefore, a portion of the force that presses the second wire 60 toward the central axis C is distributed and acts on the 34th turn of the first wire 50 and the 34th turn of the second wire 60. As a result, for example, the first intersection point CR1 of the second wire 60 is prevented from being pressed against the first wire 50 with excessive force. 【0060】 (6) The portion of the 35th turn of the second wire 60 that is closer to the second wire end 62 than the first intersection point CR1 is wound in the valley of the same turn of the first wire 50 and the second wire 60. Therefore, it is not necessary to employ a complex winding structure in the first wire 50 and the second wire 60. 【0061】 (7) In the above embodiment, the 35th turn of the second wire 60 has a second intersection CR2 in addition to the first intersection CR1. Therefore, the force pressing the 35th turn of the second wire 60 toward the central axis C is distributed not only to the first intersection CR1 but also to the second intersection CR2. Thus, it is possible to prevent either intersection from being pressed with an excessively large force. 【0062】 (8) In the above embodiment, the first intersection point CR1, the second intersection point CR2, and the third intersection point CR3 of the second wire 60 are all located on the specific side surface 11A. Therefore, the first intersection point CR1, the second intersection point CR2, and the third intersection point CR3 of the second wire 60 can be observed simply by optically observing the specific side surface 11A of the winding core 11. In other words, it is possible to determine whether each wire is wound as designed without observing the coil component 10 from different angles. 【0063】 (9) In the above embodiment, when the second wire 60 is traced from the first crossing point CR1 to the second crossing point CR2 from the first wire end 61 to the second wire end 62, the second wire 60 extends from the second flange portion 31 to the first flange portion 21. In other words, the portion of the second wire 60 from the first crossing point CR1 to the second crossing point CR2 is unwound in the opposite direction to the other portions. By unwinding the vicinity of the crossing points in the second wire 60 in this way, the winding density of the second wire 60 can be improved. 【0064】 <Example of changes> The above embodiment can be implemented with the following modifications. The above embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically. 【0065】 In the above embodiment, the configuration of the coil component 10 can be changed as appropriate. For example, the coil component 10 does not have to have a plate core 10F. Also, the shape of the plate core 10F is not limited to a rectangular plate. For example, the plate core 10F may be an elliptical plate or the like. Furthermore, instead of the plate core 10F, a resin coating material may be used to cover the lower surface of the first flange portion 21, the lower surface of the second flange portion 31, and the opposite surface 11B of the winding core portion 11. 【0066】 In the above embodiment, the shape of the core portion 11 is not limited to the example of the above embodiment. That is, the core portion 11 is not limited to a rectangular prism shape with a rectangular cross-section. For example, the shape of the core portion 11 may be a rectangular prism with a square cross-section, a rectangular prism with a rectangular and a square cross-section, or a polygonal prism other than a rectangular prism. Furthermore, the shape of the core portion 11 may be cylindrical or elliptical. 【0067】 In the above embodiment, the side with the larger area of ​​the winding core 11 was designated as the specific side 11A, but the side with the smaller area may also be designated as the specific side 11A. Furthermore, even if the winding core 11 has a polygonal shape other than a rectangular prism, as in the above modification example, any one side may be designated as the specific side 11A. Note that if the winding core 11 has a polygonal shape other than a rectangular prism, there may be no opposite side 11B. 【0068】 In the above embodiment, the materials of the drum core 10C and the plate core 10F are not limited to the examples of the above embodiment. For example, the materials of the drum core 10C and the plate core 10F are not limited to Ni-Zn ferrite, but may be Mn-Zn ferrite, etc. Also, the materials of the drum core 10C and the plate core 10F may be ferrite, alumina, synthetic resin, and mixtures thereof, etc. 【0069】 In the above embodiment, the configuration of the drum core 10C is not limited to the example of the above embodiment. For example, the first flange portion 21 does not have to have a recess portion 23. In this case, for example, the first external electrode 41 and the second external electrode 42 just need to be far apart from each other. The same applies to the second flange portion 31. 【0070】 In the above embodiments, the material and shape of the first external electrodes 41 to the fourth external electrodes 44 are not limited to the examples of each embodiment. For example, the plating layer of the first external electrodes 41 to the fourth external electrodes 44 may be a single conductive layer. Alternatively, the first external electrodes 41 to the fourth external electrodes 44 may not have a plating layer, and a conductive metal layer may be exposed. Furthermore, for example, the first external electrodes 41 to the fourth external electrodes 44 may be formed from a plate-shaped metal material. 【0071】 In the above embodiment, the cross-sectional shapes of the first wire 50 and the second wire 60 are not limited to the examples of the above embodiment. For example, the cross-sectional shapes of the first wire 50 and the second wire 60 may be elliptical, rectangular, or the like. 【0072】 In the above embodiment, the final number of turns of the first wire 50 and the second wire 60 is not limited to the example of the above embodiment. Also, the final number of turns of the first wire 50 and the final number of turns of the second wire 60 do not necessarily have to be the same. 【0073】 The specific portion SP of the second wire 60 does not necessarily include the portion located on the first ridge line R1. For example, the specific portion SP may exist only in the central part of the specific side surface 11A of the winding core 11. 【0074】 The first turn of the second wire 60, and the portion of the second wire 60 closer to the first wire end 61 than the first turn, may have a point where it intersects with the first wire 50 on a specific side surface 11A. In the above embodiment, the second wire 60 has multiple intersection points at the boundary between the winding core 11 and the second flange 31. Therefore, even if the second wire 60 has intersection points at the boundary between the winding core 11 and the first flange 21, the orientation of the coil component 10 can be determined by optical observation. 【0075】 The second crossing point CR2 on the second wire 60 is not mandatory. Depending on the location near the 35th turn of the second wire 60, near the 35th turn of the first wire 50, and the position of each external electrode, the second crossing point CR2 may be omitted. 【0076】 The portion of the 35th turn of the second wire 60 that is closer to the second wire end 62 than the first intersection point CR1 does not have to be wound in the valley between the 34th turn of the first wire 50 and the 34th turn of the second wire 60 on the specific side surface 11A. For example, the above portion may be wound directly around the core 11 between the 34th turn of the first wire 50 and the 34th turn of the second wire 60. Alternatively, it may be wound in a valley between adjacent turns other than the 34th turn of the first wire 50 and the 34th turn of the second wire 60. 【0077】 The second wire 60 may have its first crossing point CR1 on any turn other than the 35th turn. In other words, the jth turn of the second wire 60 does not have to be the turn immediately preceding the final turn. 【0078】 Specifically, in the example shown in Figure 5, from the (i-3)th turn to the (i+4th)th turn of the first wire 50, the turns are wound sequentially such that as the number of turns increases, the wire is positioned towards the second flange 31 in the direction along the central axis C. Although not shown in the illustration, from the 1st turn to the (i-4th)th turn of the first wire 50, the turns are similarly wound sequentially such that as the number of turns increases, the wire is positioned towards the second flange 31 in the direction along the central axis C. Furthermore, from the (i-3)th turn to the middle of the ith turn of the first wire 50, the turns are wound adjacent to each other in the direction along the central axis C. From the (i+1)th turn to the (i+4th)th turn of the first wire 50, the turns are wound adjacent to each other in the direction along the central axis C. Finally, from the middle of the ith turn to the (i+1)th turn of the first wire 50, the turns are spaced apart from the other turns of the first wire 50 adjacent to each other in the positive direction X1. Therefore, the first wire 50 from the (i-3)th turn to the (i+4th)th turn belongs to the first layer L1. Note that in Figure 5, the spacing between adjacent turns of the first wire 50 is exaggerated. Although not shown in the illustration, from the (i+5)th turn to the final turn of the first wire 50, the turns are wound in a sequence such that as the number of turns increases, they are positioned towards the second flange portion 31 in the direction along the central axis C. 【0079】 Although not shown in the diagram, the second wire 60 is wound in the valleys between adjacent turns of the first wire 50 from the first turn to the (j-4) turn. As shown in Figure 5, the (j-3) turn of the second wire 60 is located in the valley between the (i-3) and (i-2) turns of the first wire 50. The (j-2) turn of the second wire 60 is located in the valley between the (i-2) and (i-1) turns of the first wire 50. Up to partway through the (j-1) turn of the second wire 60 is located in the valley between the (i-1) and i-turn of the first wire 50. Therefore, the second wire 60 from the (j-3) turn to partway through the (j-1) turn belongs to the second layer L2. 【0080】 The second wire 60 is wound directly around the core 11 in the negative direction X2 relative to the i-th turn of the first wire 50, partway through its j-th turn. The second wire 60 is wound directly around the core 11 between its j-th turn and its (i+1)-th turn. Therefore, the j-th turn of the second wire 60 has a first intersection point CR1 that crosses the i-th turn of the first wire 50 from the outside. From partway through its (j+1)-th turn, the second wire 60 is wound directly around the core 11 between its i-th turn and its j-th turn. Therefore, this portion of the (j+1)-th turn of the second wire 60 is a specific portion SP. Subsequently, the (j+1)-th turn of the second wire 60 crosses the j-th turn of the second wire. In other words, the (j+1)th turn of the second wire 60 has a third crossing point CR3. 【0081】 The (j+2)th turn of the second wire 60 is located in the valley between the (i+1)th and (i+2)th turns of the first wire 50. The (j+3)th turn of the second wire 60 is located in the valley between the (i+2)th and (i+3)th turns of the first wire 50. The (j+4)th turn of the second wire 60 is located in the valley between the (i+3)th and (i+4)th turns of the first wire 50. And, although not shown in the diagram, from the (j+5)th turn of the second wire 60 to its final turn, it is wound around the valleys of adjacent turns of the first wire 50. 【0082】 • In the modified example shown in Figure 5, the second wire 60 may be wound in the valley between the j-th turn of the second wire 60 and the (i+1)-th turn of the first wire 50, up to partway through the (j+1)-th turn. [Explanation of symbols] 【0083】 11…Core section 21...First guard section 31...Second guard section 41...First external electrode 42…Second external electrode 43…Third external electrode 44...Fourth external electrode 50…First wire 51... First wire, first wire end 52...Second wire end of the first wire 60...Second wire 61...First wire end of the second wire 62...Second wire end of the second wire CR1...First intersection CR2...Second intersection CR3...Third intersection SP…Specific part

Claims

[Claim 1] A columnar core section, A first flange portion is provided at the first end of the winding core portion in the direction along the central axis, A second flange portion is provided at the second end of the winding core portion opposite to the first end, The first external electrode and the second external electrode provided on the first flange portion, The third external electrode and the fourth external electrode provided on the second flange portion, A first wire is wound around the aforementioned core, with its first end connected to the first external electrode and its second end connected to the third external electrode, A second wire is wound around the core in the same direction as the first wire, with its first end connected to the second external electrode and its second end connected to the fourth external electrode, Equipped with, With respect to the first wire and the second wire, assuming that the number of turns increases by one each time the wire completes one revolution around the central axis from the first wire end towards the second wire end, The j-th turn of the second wire (where j is an integer of 2 or more) has a first intersection point that intersects the i-th turn of the first wire (where i is an integer of 2 or more) from the outside. The (j+1)th turn of the second wire has a specific portion located between the ith turn of the first wire and the jth turn of the second wire in a direction along the central axis of the winding core, The (j+1)th turn of the second wire intersects the jth turn of the second wire from the outside, on the side of the second wire end that is closer to the specific portion. Coil components. [Claim 2] The aforementioned core portion is polygonal prism-shaped, When one of the sides of the winding core is designated as a specific side, and one of the two ridges between the specific side and another adjacent side is designated as a first ridge and the other ridge as a second ridge, When the second wire is traced from the first wire end to the second wire end, it passes along the first ridge and the second ridge in that order on the specific side surface. The specified portion of the second wire includes the portion located on the first ridge line. The coil component according to claim 1. [Claim 3] The (j+1)th turn of the second wire is the final turn of the second wire. The coil component according to claim 1. [Claim 4] The aforementioned core portion is polygonal prism-shaped, When one of the sides of the aforementioned winding core is designated as a specific side, The first turn of the second wire and the portion of the second wire closer to the first wire end than the first turn do not have any points on the specific side surface where they intersect with the first wire. The coil component according to claim 1. [Claim 5] The (j-1)th turn of the second wire has a portion wound in the valley between adjacent turns of the first wire, The (j+2)th turn of the second wire has a portion wound in the valley between adjacent turns of the first wire. The coil component according to claim 1. [Claim 6] The first turn to the (j-1)th turn of the second wire is wound in the valley between adjacent turns of the first wire. From the (j+2)th turn of the second wire to the final turn, it is wound in the valley between adjacent turns of the first wire. The coil component according to claim 5.

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