Coil component

Abstract

When a second lead wire intersects a first lead wire, a space in which the second lead wire is not wound is easily generated near the intersection position of the second lead wire. The thirty-fifth turn of the second conductive wire (60) has a first intersection position (CR1) that intersects the thirty-fifth turn of the first conductive wire (50) from the outside. The thirty-sixth turn of the second conductive wire (60) has a specific portion (SP) located between the thirty-fifth turn of the first conductive wire (50) and the thirty-fifth turn of the second conductive wire (60) in a direction along the central axis of the winding core portion (11). The thirty-sixth turn of the second conductive wire has a third crossing position (CR3) that crosses the thirty-fifth turn of the second conductive wire from the outside on the second wire end (62) side of the specific portion (SP).

Description

Technical Field

[0001] This invention relates to coil components. Background Technology

[0002] The common-mode filter described in Patent Document 1 includes a drum-shaped magnetic core, a first conductor, and a second conductor. The drum-shaped magnetic core has a prism-shaped core portion, a first flange portion located at a first end of the core portion, and a second flange portion located at a second end of the core portion. The first conductor is wound around the core portion. The second conductor is wound around the core portion from the outside relative to the first conductor. Furthermore, a predetermined turn of the second conductor has an intersection position relative to the first conductor.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2018-120885

[0004] In the common-mode filter described in Patent Document 1, the first and second conductors are wound into a spiral shape in the core section with substantially the same spacing. However, near such crossing positions, the conductors are wound at a different spacing than at other positions. Therefore, in the direction along the central axis of the core section, spaces where the second conductor is not wound are easily created near the crossing positions. Such spaces prevent high-density winding of the second conductor. Summary of the Invention

[0005] One solution to the above-mentioned problem is a coil component comprising: a cylindrical core portion; a first flange portion disposed at a first end of the core portion along a central axis; a second flange portion disposed at a second end of the core portion opposite to the first end; a first external electrode and a second external electrode disposed at the first flange portion; a third external electrode and a fourth external electrode disposed at the second flange portion; a first wire wound around the core portion, 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 core portion 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 third external electrode. Regarding the aforementioned fourth external electrode connection, when the number of turns increases by one each time the first wire end is wound around the central axis towards the second wire end, the j-th turn of the second wire (j is an integer greater than or equal to 2) has a first crossing position that intersects the i-th turn of the first wire (i is an integer greater than or equal to 2) 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 core portion. Compared with the specific portion, the (j+1)-th turn of the second wire intersects the j-th turn of the second wire from the outside on the second wire end side.

[0006] It can reduce the space near the intersection of the second conductor and the second conductor that is not wound in the direction along the central axis. Attached Figure Description

[0007] Figure 1 This is a 3D view of the coil component.

[0008] Figure 2 It is a diagram showing the winding structure of each conductor, and a schematic end view of the coil component on the end face including the central axis and orthogonal to the left and right axes.

[0009] Figure 3 yes Figure 2 A magnified view of a portion of the image.

[0010] Figure 4 This is a partial schematic top view showing the coil component with the winding structure of each conductor.

[0011] Figure 5 This is a partial schematic top view of the coil component in the modified example.

[0012] Explanation of reference numerals in the attached figures

[0013] 11…core portion, 21…first flange portion, 31…second flange portion, 41…first external electrode, 42…second external electrode, 43…third external electrode, 44…fourth external electrode, 50…first wire, 51…first end of the first wire, 52…second end of the first wire, 60…second wire, 61…first end of the second wire, 62…second end of the second wire, CR1…first cross position, CR2…second cross position, CR3…third cross position, SP…specific portion. Detailed Implementation

[0014] <An embodiment of the coil component>

[0015] The following describes one embodiment of the coil component. Furthermore, the accompanying drawings sometimes show enlarged components to facilitate understanding. Sometimes the dimensional ratios of the components differ from the actual dimensional ratios, or from the dimensional ratios in other drawings.

[0016] (Overall structure)

[0017] like Figure 1 As shown, the coil component 10 includes a drum magnetic core 10C and a planar magnetic core 10F.

[0018] The drum magnetic core 10C has a core portion 11, a first flange portion 21, and a second flange portion 31.

[0019] The core portion 11 has a rectangular quadrangular prism shape in cross-section. That is, the core portion 11 has four sides. The material of the core portion 11 is, for example, Ni-Zn based ferrite.

[0020] A first flange portion 21 is disposed at a first end of the core portion 11 along the central axis C. Specifically, the first flange portion 21 is connected to the first end of the core portion 11 along the central axis C. A second flange portion 31 is disposed at a second end of the core portion 11 along the central axis C. Specifically, the second flange portion 31 is connected to the second end of the core portion 11 along the central axis C. The first flange portion 21 and the second flange portion 31 are made of the same material as the core portion 11. Furthermore, the first flange portion 21 and the second flange portion 31 are integrally formed with the core portion 11.

[0021] Here, the axis parallel to the central axis C is designated as the core axis X. Additionally, a specific axis orthogonal to the core axis X is designated as the upper and lower axes Y. In this embodiment, the upper and lower axes Y extend in a direction orthogonal to the mounting surface when the coil component 10 is mounted on the substrate. Furthermore, an axis orthogonal to both the core axis X and the upper and lower axes Y is designated as the left and right axes Z. Moreover, one direction along the core axis X is designated as the positive direction X1, and the opposite direction X1 is designated as the negative direction X2. In this embodiment, the positive direction X1 coincides with the direction from the core portion 11 toward the first flange portion 21. The negative direction X2 coincides with the direction from the core portion 11 toward the second flange portion 31. Additionally, one direction along the upper and lower axes Y is designated as the upward direction Y1, and the opposite direction Y1 is designated as the downward direction Y2. Furthermore, one direction along the left and right axes Z is designated as the right direction Z1, and the opposite direction Z1 is designated as the left direction Z2. Furthermore, the directions Y1 (up) and Y2 (down) mentioned here are for convenience and do not indicate the direction of gravity. Similarly, the directions Z1 (right) and Z2 (left) are also for convenience and do not indicate the left and right directions from a specific viewpoint.

[0022] The core portion 11 on the cross-section orthogonal 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. Moreover, one of the sides with the larger area faces upward towards the Y1 side, and the other side with the larger area faces downward towards the Y2 side.

[0023] In addition, the following, such as Figure 2As shown, the side facing upward Y1 is designated as the specific side 11A, and the side opposite to the specific side 11A is designated as the opposite side 11B. Furthermore, the specific side 11A need not be a plane orthogonal to the vertical axis Y. That is, the surface of the core portion 11 that can be visually confirmed when viewing the coil member 10 from the upward Y1 side towards the downward Y2 side relative to the coil member 10 is the specific side 11A. Additionally, as... Figure 4 As shown, the edge on the left side (Z2 side) of the two edges between a specific side 11A and the other adjacent sides is designated as the first edge R1. Additionally, the edge on the right side (Z1 side) of the edges between the specific side 11A and the other sides is designated as the second edge R2.

[0024] like Figure 1 As shown, when viewed in the direction along the central axis C, the first flange portion 21 protrudes outward relative 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 symmetrical with respect to a virtual plane containing the central axis C and orthogonal to the horizontal axis Z.

[0025] The first flange portion 21 has a main body portion 22 and a recessed portion 23. The main body portion 22 is integrally a thin cuboid shape along the direction of the central axis C. When viewed in the negative direction X2, the two edges of the main body portion 22 on the upper Y1 side and the lower Y2 side are parallel to the left and right axes Z. In addition, when viewed in the negative direction X2, the two edges of the main body portion 22 on the left Z2 side and the right Z1 side are parallel to the upper and lower axes Y.

[0026] The recess 23 is recessed downwards towards the Y2 direction from the upper surface of the main body 22. The recess 23 becomes smaller along the Z-axis as it moves downwards towards the Y2 direction. The recess 23 is located approximately at the center of the main body 22 along the Z-axis. The dimension of the recess 23 along the central axis C is the same as the dimension of the main body 22 along the central axis C. That is, a portion of the first flange 21 on the upper Y1 side becomes a forked shape separated by the recess 23.

[0027] The second flange portion 31 and the first flange portion 21 are symmetrical in shape to a virtual plane orthogonal to the central axis C, passing through the center of the core portion 11 along the central axis C. That is, when viewed from the direction along the central axis C, the second flange portion 31 protrudes outward relative to the core portion 11 in the directions along the vertical axis Y and the horizontal axis Z. Furthermore, the second flange portion 31 has a main body portion 32 and a recessed portion 33. The structure of the main body portion 32 and the recessed portion 33 of the second flange portion 31 is the same as that 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 from the upper surface of the main body portion 32 in the Y2 direction.

[0028] The planar magnetic core 10F is a rectangular plate. The long side of the planar magnetic core 10F is parallel to the central axis C. The short side of the planar magnetic core 10F is parallel to the left-right axis Z. The planar magnetic core 10F is located on the lower Y2 side relative to the drum magnetic core 10C. The planar magnetic 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. In other words, the planar magnetic core 10F is mounted between the first flange portion 21 and the second flange portion 31. The material of the planar magnetic core 10F is the same as that of the drum magnetic core 10C. Furthermore, although not shown in the figure, an adhesive is sandwiched between the planar magnetic core 10F and the first flange portion 21 and the second flange portion 31.

[0029] like Figure 1 As shown, 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.

[0030] The first external electrode 41 is disposed on the first flange portion 21. That is, the first external electrode 41 is mounted on the surface of the first flange portion 21. The first external electrode 41 is located on the surface of the first flange portion 21 in the upward direction Y1 side, and is located on the left direction Z2 side relative to the recessed portion 23.

[0031] The second external electrode 42 is disposed on the first flange portion 21. That is, the second external electrode 42 is mounted on the surface of the first flange portion 21. The second external electrode 42 is located on the surface of the first flange portion 21 in the upward direction Y1 side, and is located on the rightward direction Z1 side relative to the recessed portion 23.

[0032] The third external electrode 43 is disposed on the second flange portion 31. That is, the third external electrode 43 is mounted on the surface of the second flange portion 31. The third external electrode 43 is located on the surface of the second flange portion 31 in the upward direction Y1 and is located on the left direction Z2 side relative to the recess portion 33.

[0033] A fourth external electrode 44 is disposed on the second flange portion 31. That is, the fourth external electrode 44 is mounted on the surface of the second flange portion 31. The fourth external electrode 44 is located on the surface of the second flange portion 31 on the upper Y1 side and on the right Z1 side relative to the recess portion 33.

[0034] Although not shown in the diagram, these first external electrodes 41 to fourth external electrodes 44 have a metal layer and a plating layer. The metal layer is, for example, a layer primarily composed of silver. The plating layer is, for example, composed of multiple layers such as a layer primarily composed of copper, a layer primarily composed of nickel, and a layer primarily composed of tin. In this embodiment, the surface of the coil component 10 on which the first external electrodes 41 to fourth external electrodes 44 are disposed is the surface facing the substrate when the coil component 10 is mounted on the substrate. Furthermore, in Figure 1 In the diagram, the first external electrode 41 to the fourth external electrode 44 are illustrated with double-dotted lines.

[0035] <Structure of the first and second conductors>

[0036] like Figure 1 As shown, the coil component 10 includes a first conductor 50 and a second conductor 60. These first conductors 50 and second conductors 60 have portions wound around the core portion 11. Furthermore, in... Figure 1 In the simplified diagram, the winding structure of the portion of the first conductor 50 and the second conductor 60 wound around the core portion 11 is shown as a cylindrical object in which each turn of each conductor is integrated.

[0037] Although not shown in the figures, the first conductor 50 has a conductor and an insulating coating. The insulating coating covers the outer peripheral surface of the conductor. The first conductor 50 is generally circular in a cross-section orthogonal to the direction in which it extends. The first conductor 50 has a first end 51 and a second end 52 opposite to the first end 51. Furthermore, in each figure, the first conductor 50 is colored with dots.

[0038] like Figure 1 As shown, 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, the position where the first wire 50 first contacts the outer peripheral surface of the core portion 11 when moving from the first end 51 to the second end 52 is defined as the position of 1.0 turn of the first wire 50. In this embodiment, the position of 1.0 turn of the first wire 50 is located on the second ridge line R2 of the core portion 11.

[0039] like Figure 2 As shown, regarding the first conductor 50, the number of turns of the first conductor 50 increases by one each time it is wound around the central axis C from the first end 51 to the second end 52. When viewed in the negative direction X2, the first conductor 50 is wound clockwise on the core portion 11 as the number of turns increases. Therefore, as... Figure 4 As shown, the first conductor 50 passes through a specific side 11A in the order of the first ridge line R1 and the second ridge line R2 as it moves from the first end 51 toward the second end 52.

[0040] More specifically, for example, when viewed in the negative direction X2, the position 1.1 of the first conductor 50 is located 36 degrees clockwise from the position of the 1.0 turn of the first conductor 50, centered on the central axis C. Furthermore, the first turn of the first conductor 50 refers to the portion immediately preceding the position from the 1.0 turn to the 2.0 turn. Additionally, the final turn of the first conductor 50 refers to the turn included at the position where the first conductor 50 finally contacts the outer peripheral surface of the core portion 11 as it moves from the first wire end 51 towards the second wire end 52. Furthermore, in... Figures 2-4In the diagram, if the value is within the range of the first turn, then regardless of its position within the first turn, it will be represented as "1". The same applies to other numbers of turns. Furthermore, sometimes... Figures 2-4 The number of turns shown is inconsistent with the number of turns counted from the start of manufacturing winding. Additionally, in Figure 4 In this diagram, the conductors on a specific side 11A are not shown as having different thicknesses, but are simplified using lines. Furthermore, the first conductor 50 is shown with dashed lines, and the second conductor 60 is shown with solid lines.

[0041] like Figure 1 As shown, the second conductor 60 has the same structure as the first conductor 50. That is, the second conductor 60 has a conductor and an insulating film. The insulating film covers the outer surface of the conductor. The second conductor 60 is approximately circular in a cross-section orthogonal to the direction in which it extends. The second conductor 60 has a first wire end 61 and a second wire end 62 on the opposite side of the first wire end 61.

[0042] like Figure 1 As shown, 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, the position where the angular position centered on the central axis C first coincides with the angular position of the 1.0 turn of the first wire 50 when the second wire 60 moves from the first end 61 to the second end 62 is defined as the position of the 1.0 turn of the second wire 60. That is, in this embodiment, the position of the 1.0 turn of the second wire 60, when viewed in the direction along the central axis C, is located on a semi-straight line extending from the central axis C to the second ridge line R2 of the core portion 11.

[0043] like Figure 2 As shown, regarding the second conductor 60, the number of turns of the second conductor 60 increases by one each time it is wound around the central axis C from the first conductor end 61 to the second conductor end 62. When viewed in the negative direction X2, the second conductor 60 is wound clockwise on the core portion 11 as the number of turns increases. That is, the second conductor 60 and the first conductor 50 are wound in the core portion 11 in the same direction. Therefore, as... Figure 4 As shown, the second conductor 60 passes through a specific side 11A in the order of the first ridge line R1 and the second ridge line R2 as it moves from the first end 61 toward the second end 62. Furthermore, the method for counting the turns of the second conductor 60 is the same as that for the first conductor 50.

[0044] Hereinafter, regarding the first conductor 50 and the second conductor 60, the portion directly wound around the core portion 11 will be designated as the first layer L1. Here, "directly wound" means not only the state of contact with the outer peripheral surface of the core portion 11, but also the state of the conductor floating relative to the core portion 11, and also includes the state of winding with the core portion 11 without passing through other conductors.

[0045] Furthermore, regarding the first conductor 50 and the second conductor 60, the portion of the conductor wound from the outside in a direction orthogonal to the central axis C around the valley of the adjacent first layer L1 conductor in the direction along the central axis C is designated as the second layer L2. Also, regarding the first conductor 50 and the second conductor 60, the portion of the conductor wound from the outside in a direction orthogonal to the central axis C around the valley of the adjacent second layer L2 conductor in the direction along the central axis C is designated as the third layer L3.

[0046] <Specific winding structure of the first and second conductors>

[0047] like Figure 2 As shown, approximately all turns of the first conductor 50 belong to the first layer L1. The first conductor 50 is wound from the first turn to the thirty-sixth turn. That is, the final turn of the first conductor 50 is the thirty-sixth turn.

[0048] From the first turn to the thirty-sixth turn of the first conductor 50, the number of turns increases sequentially, with the conductor being positioned further towards the second flange 31 in the direction along the central axis C. Furthermore, from the first turn to the midpoint of the thirty-fifth turn of the first conductor 50, the conductor is wound adjacent to each other in the direction along the central axis C. Moreover, from the midpoint of the thirty-fifth turn to the thirty-sixth turn of the first conductor 50, the conductor is arranged at intervals relative to other turns of the first conductor 50 adjacent in the positive direction X1. And, as described later, the second conductor 60 is located in this interval.

[0049] Here, "adjacent grounding" is not limited to the case where the turns of adjacent conductors are in contact with each other. Even assuming that the turns of adjacent conductors are not in contact with each other, it can also be said to be adjacent if there are no other conductors on the line segment connecting the centers of adjacent conductors when viewed from the end face.

[0050] The second conductor 60 is wound from the first turn to the thirty-sixth turn. That is, the final turn of the second conductor 60 is the thirty-sixth turn. Most of the second conductor 60 belongs to the second layer L2. However, the second conductor 60 also has portions belonging to the first layer L1 and portions belonging to the third layer L3.

[0051] The portion of the second conductor 60 on the first end 61 side, compared to the 1.0 turn, is not located on the specific side 11A. Therefore, the portion of the second conductor 60 on the first end 61 side, compared to the 1.0 turn, does not have a position where it intersects with the first conductor 50 on the specific side 11A. Furthermore, the entire area of ​​the first turn of the second conductor 60 is located between the first turn and the second turn of the first conductor 50. Therefore, the first turn of the second conductor 60 does not have a position where it intersects with the first conductor 50 on the specific side 11A.

[0052] The second turn of the second conductor 60 is located between the second and third turns of the first conductor 50. The third turn of the second conductor 60 is located between the third and fourth turns of the first conductor 50. Thus, from the first turn to the middle of the nineteenth turn of the second conductor 60, the nth turn of the second conductor 60 is wound between the nth turn and the (n+1)th turn of the first conductor 50. However, "n" here is an integer between 1 and 19. Therefore, from the first turn to the middle of the nineteenth turn of the second conductor 60, it belongs to the second layer L2.

[0053] Starting from the middle of the nineteenth turn of the second conductor 60, it extends towards the positive direction X1. Specifically, the portion of the nineteenth turn of the second conductor 60 up to the opposite side 11B is wound between the valleys of the nineteenth and twentieth turns of the first conductor 50. Subsequently, the nineteenth turn of the second conductor 60 extends towards the first flange 21 and, on a specific side 11A, is wound between the valleys of the sixteenth and seventeenth turns of the second conductor 60. Therefore, the nineteenth turn of the second conductor 60 crosses relative to the eighteenth and seventeenth turns of the second conductor 60 on the side facing the left direction Z2.

[0054] The twentieth turn of the second conductor 60 is wound between the valleys of the seventeenth and eighteenth turns of the second conductor 60. Up to the middle of the twenty-first turn of the second conductor 60, it is wound between the valleys of the eighteenth and nineteenth turns of the second conductor 60. Subsequently, the twenty-first turn of the second conductor 60 is wound between the valleys of the nineteenth and twentieth turns of the first conductor 50. Specifically, the portion on the opposite side 11B of the twenty-first turn of the second conductor 60 is wound between the valleys of the eighteenth and nineteenth turns of the second conductor 60. Furthermore, the portion on a specific side 11A of the twenty-first turn of the second conductor 60 is wound between the valleys of the nineteenth and twentieth turns of the first conductor 50. Therefore, the twenty-first turn of the second conductor 60 crosses the nineteenth turn of the second conductor 60 on the side facing left in the Z2 direction. Thus, from the middle of the nineteenth turn to the middle of the twenty-first turn of the second conductor 60, it belongs to the third layer L3.

[0055] The twenty-second turn of the second conductor 60 is located between the twentieth and twenty-first turns of the first conductor 50. Furthermore, the twenty-third turn of the second conductor 60 is located between the twenty-first and twenty-second turns of the first conductor 50. Thus, within the range from the twenty-second to the twenty-seventh turn of the second conductor 60, the nth turn of the second conductor 60 is wound between the (n-2)th and (n-1)th turns of the first conductor 50. However, here n is an integer between 22 and 27.

[0056] The 27th turn of the second conductor 60 crosses the 26th and 27th turns of the first conductor 50 on a specific side 11A, from the first flange 21 side toward the second flange 31 side.

[0057] The 28th turn of the second conductor 60 is located between the 28th and 29th turns of the first conductor 50. Furthermore, the 29th turn of the second conductor 60 is located between the 29th and 30th turns of the first conductor 50. Thus, from the midpoint of the 28th to the midpoint of the 34th turn of the second conductor 60, the nth turn of the second conductor 60 is wound between the nth and (n+1)th turns of the first conductor 50. However, n here is an integer between 28 and 34. Additionally, the section from the midpoint of the 21st to the midpoint of the 34th turn of the second conductor 60 belongs to the second layer L2.

[0058] like Figure 3 As shown, the portion of the third fourteenth turn of the second conductor 60 located on a specific side 11A is directly wound around the core portion 11 between the thirty-fourth and thirty-fifth turns of the first conductor 50.

[0059] like Figure 4 As shown, the second conductor 60, up to the middle of its thirty-fifth turn, is adjacent to the thirty-fifth turn of the first conductor 50 on the negative direction X2 side and is directly wound onto the core portion 11. Thereafter, the thirty-fifth turn of the second conductor 60 has a first crossing position CR1 on a specific side 11A, where it intersects with the thirty-fifth turn of the first conductor 50 from the outside. Figure 3 As shown, near the first intersection position CR1, the thirty-fifth turn of the second conductor 60, which belongs to the first layer L1, crosses over the thirty-fifth turn of the first conductor 50 to become the second layer L2.

[0060] like Figure 4 As shown, the portion of the thirty-fifth turn of the second conductor 60 on the second end 62 side, compared to the first crossing position CR1, has a second crossing position CR2 on a specific side 11A that crosses the thirty-fourth turn of the second conductor 60 from the outside. Furthermore, when the first crossing position CR1 to the second crossing position CR2 in the second conductor 60 is moved from the first end 61 side towards the second end 62 side, the second conductor 60 extends from the second flange 31 side towards the first flange 21 side. In other words, the second crossing position CR2 is located on the positive direction X1 side relative to the first crossing position CR1. Moreover, the portion of the thirty-fifth turn of the second conductor 60 from the second crossing position CR2 to immediately before the thirty-sixth turn is wound between the thirty-fourth turn of the first conductor 50 and the thirty-fourth turn of the second conductor 60.

[0061] Up to the middle of the thirty-sixth turn of the second conductor 60, it is wound between the thirty-fifth turn of the first conductor 50 and the thirty-fifth turn of the second conductor 60. Furthermore, starting from the middle of the thirty-sixth turn of the second conductor 60, a specific portion SP is directly wound onto the core portion 11. This specific portion SP is located between the thirty-fifth turn of the first conductor 50 and the thirty-fifth turn of the second conductor 60 in the direction along the central axis C of the core portion 11. Additionally, the specific portion SP includes a portion located on the first ridge line R1 of the core portion 11.

[0062] The second conductor 60 separates from the side of the core portion 11 at its second end 62 compared to the specific portion SP, and reaches the fourth external electrode 44. Furthermore, the second end 62 of the second conductor 60 is connected to the fourth external electrode 44. As a result, the thirty-sixth turn of the second conductor 60 has a third crossing position CR3 at its second end 62 compared to the specific portion SP, where it intersects with the thirty-fifth turn of the second conductor 60 from the outside. Moreover, this third crossing position CR3 is located on the specific side 11A.

[0063] Furthermore, at the third crossing position CR3, the thirty-fifth and thirty-sixth turns of the second conductor 60 are not in contact with each other. That is, at the third crossing position CR3, the thirty-sixth turn of the second conductor 60 is away from the thirty-fifth turn in the upward direction Y1. Thus, the "crossing position" only requires the two conductors to cross when viewed in a direction orthogonal to a particular side 11A, for example, without them needing to be in contact with each other.

[0064] Furthermore, as described above, the second conductor 60 has a first crossing position CR1, a second crossing position CR2, a third crossing position CR3, and other crossing positions on a specific side 11A. Additionally, the second conductor 60 has a crossing position on the side facing left in the Z2 direction of the core portion 11. On the other hand, the second conductor 60 does not have a crossing position on the opposite side 11B.

[0065] Here, i is set to 35, and j is set to 35. In this case, the (j+1)th turn of the second conductor 60 is the final turn of the second conductor 60. Furthermore, when i and j are both set to 35, the jth turn of the second conductor 60 has a first crossing position CR1 that intersects the ith turn of the first conductor 50 from the outside. Additionally, the jth turn of the second conductor 60 has a second crossing position CR2 that intersects the (j-1)th turn of the second conductor 60 from the outside. Moreover, the (j+1)th turn of the second conductor 60 has a specific portion SP. This specific portion SP is directly wound around the core portion 11 and is located between the ith turn of the first conductor 50 and the jth turn of the second conductor 60 in the direction along the central axis C of the core portion 11.

[0066] <Effects of the Implementation Method>

[0067] The above implementation method achieves the following effects.

[0068] (1) In the above embodiment, the thirty-fifth turn of the second conductor 60 has a first crossing position CR1. Due to this relationship, a space is created around the thirty-fifth turn of the second conductor 60 in the direction along the central axis C. On the other hand, the thirty-sixth turn of the second conductor 60 has a specific portion SP. Moreover, the specific portion SP is directly wound around the core portion 11 and is located between the thirty-fifth turn of the first conductor 50 and the thirty-fifth turn of the second conductor 60 in the direction along the central axis C of the core portion 11. That is, the space on the positive direction X1 side relative to the thirty-fifth turn of the second conductor 60 is used as space for winding the thirty-sixth turn. Such a winding structure facilitates high-density winding of the second conductor 60.

[0069] Furthermore, the thirty-sixth turn of the second conductor 60 has a third crossing position CR3 on the side of the second wire end 62 compared to the specific portion SP, where it crosses the thirty-fifth turn of the second conductor 60 from the outside. By making the second conductor 60 cross again in this way, the second wire end 62 of the second conductor 60 can be connected to the fourth external electrode 44. Moreover, at the third crossing position CR3, the second conductor 60 is in a state separated from the first conductor 50 in the upward direction Y1, so it is not necessary to ensure that the size of the third crossing position CR3 in the second conductor 60 is the size of the core portion 11 in the direction along the central axis C.

[0070] (2) In the above embodiment, a specific portion SP of the second conductor 60 includes a portion located on the first ridge line R1 of the core portion 11. On the first ridge line R1, the second conductor 60 is pressed against the core portion 11 with a relatively strong force. Therefore, according to the above structure, it is possible to suppress winding collapse around the specific portion SP.

[0071] (3) In the above embodiment, the final turn of the second conductor 60 is the thirty-sixth turn. In other words, the first crossing position CR1, the second crossing position CR2, and the third crossing position CR3 are concentrated at the final turn of the second conductor 60 and the turn preceding it. Therefore, for example, by optically observing the boundary portion between the core portion 11 and the second flange portion 31, it is possible to determine which side 11A of the core portion 11 is facing, i.e., the orientation of the coil component 10.

[0072] (4) In the above embodiment, the first turn of the second conductor 60 and the portion on the first wire end 61 side compared to the first turn do not have a position on a specific side 11A that crosses the first conductor 50. On the other hand, as described above, the second conductor 60 has multiple crossing positions at the boundary between the core portion 11 and the second flange portion 31. Therefore, by optically observing each conductor on a specific side 11A of the core portion 11, the orientation of the coil component 10 can be identified.

[0073] (5) In the above embodiment, the portion of the 35th turn of the second conductor 60 on the second end 62 side, compared to the first crossing position CR1, is wound between the valleys of two adjacent turns. Specifically, this portion is wound between the valleys of the 34th turn of the first conductor 50 and the 34th turn of the second conductor 60. Therefore, a portion of the force pressing the second conductor 60 toward the central axis C is distributed across these 34th turns of the first conductor 50 and the 34th turn of the second conductor 60. As a result, for example, the first crossing position CR1 of the second conductor 60 is prevented from being pressed against the first conductor 50 with excessive force.

[0074] (6) The portion of the 35th turn of the second conductor 60 on the second end 62 side, compared to the first cross position CR1, is wound between the valleys of the same turn of the first conductor 50 and the second conductor 60. Therefore, it is not necessary to use a complex winding structure in the first conductor 50 and the second conductor 60.

[0075] (7) In the above embodiment, the 35th turn of the second conductor 60 has a second crossing position CR2 in addition to the first crossing position CR1. Therefore, the force pressing the 35th turn of the second conductor 60 toward the central axis C is distributed not only at the first crossing position CR1 but also at the second crossing position CR2. Therefore, it prevents pressing any crossing position with excessive force.

[0076] (8) In the above embodiment, the first crossing position CR1, the second crossing position CR2, and the third crossing position CR3 of the second conductor 60 are all located on a specific side 11A. Therefore, the first crossing position CR1, the second crossing position CR2, and the third crossing position CR3 of the second conductor 60 can be observed by optical observation only on the specific side 11A of the core portion 11. That is, even without observing the coil component 10 from different angles, it is possible to distinguish whether each conductor is wound as designed.

[0077] (9) In the above embodiment, when the first crossing position CR1 to the second crossing position CR2 of the second conductor 60 extends from the first wire end 61 side toward the second wire end 62 side, the second conductor 60 extends from the second flange portion 31 side toward the first flange portion 21 side. In other words, the portion of the second conductor 60 from the first crossing position CR1 to the second crossing position CR2 is wound back in the opposite direction to the other portions. By winding back near the crossing positions in the second conductor 60, the winding density of the second conductor 60 can be increased.

[0078] <Example of Change>

[0079] The above embodiments can be modified as follows. The above embodiments and the following modifications can be combined with each other within the scope of technical inconsistency.

[0080] • In the above embodiment, the structure of the coil component 10 can be appropriately modified. For example, the coil component 10 may not have a planar magnetic core 10F. In addition, the shape of the planar magnetic core 10F is not limited to a rectangular plate. For example, the planar magnetic core 10F may also be an elliptical plate. Furthermore, instead of the planar magnetic core 10F, a resin coating material covering 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 core portion 11 may be used.

[0081] • In the above embodiments, the shape of the core portion 11 is not limited to the examples of the above embodiments. 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 also be a rectangular prism shape with a square cross-section, or a rectangular prism shape with a cross-section other than a square, or a polygonal prism shape other than a rectangular prism shape. Furthermore, the shape of the core portion 11 may also be cylindrical or elliptical cylindrical.

[0082] • In the above embodiment, the side with the larger area among the side surfaces of the core portion 11 is designated as the specific side surface 11A, but the side with the smaller area can also be designated as the specific side surface 11A. Furthermore, even in the case where the core portion 11 is a polygon other than a quadrangular prism, as in the modified example described above, any one side surface can be designated as the specific side surface 11A. Additionally, in the case where the core portion 11 is a polygon other than a quadrangular prism, there may be a case where the opposite side surface 11B is not present.

[0083] • In the above embodiments, the materials of the drum core 10C and the planar core 10F are not limited to the examples of the above embodiments. For example, the materials of the drum core 10C and the planar core 10F are not limited to Ni-Zn ferrite, but may also be Mn-Zn ferrite, etc. In addition, the materials of the drum core 10C and the planar core 10F may also be ferrite, alumina, synthetic resin, and mixtures thereof.

[0084] • In the above embodiments, the structure of the drum core 10C is not limited to the examples of the above embodiments. For example, the first flange portion 21 may not have the recessed portion 23. In this case, for example, it is sufficient that the first external electrode 41 and the second external electrode 42 are separated from each other. The same applies to the second flange portion 31.

[0085] • In the above embodiments, the material and shape of the first external electrode 41 to the fourth external electrode 44 are not limited to the examples of each embodiment. For example, the plating layer of the first external electrode 41 to the fourth external electrode 44 may also be a conductive layer. Alternatively, the first external electrode 41 to the fourth external electrode 44 may not have a plating layer, and the conductive metal layer may be exposed. Furthermore, for example, the first external electrode 41 to the fourth external electrode 44 may also be formed of a plate-shaped metal material.

[0086] • In the above embodiments, the cross-sectional shapes of the first conductor 50 and the second conductor 60 are not limited to the examples of the above embodiments. For example, the cross-sectional shapes of the first conductor 50 and the second conductor 60 may also be elliptical, rectangular, etc.

[0087] • In the above embodiments, the final number of turns of the first conductor 50 and the second conductor 60 is not limited to the examples of the above embodiments. In addition, the final number of turns of the first conductor 50 and the final number of turns of the second conductor 60 may not be the same.

[0088] • A specific portion SP of the second conductor 60 may not include the portion located on the first ridge line R1. For example, the specific portion SP may only exist in the central portion of a specific side 11A of the core portion 11.

[0089] • Alternatively, the first turn of the second conductor 60, and the portion of the second conductor 60 on the first wire end 61 side compared to the first turn, may have positions where they intersect with the first conductor 50 on a specific side 11A. In the above embodiment, the second conductor 60 has multiple intersection positions at the boundary portion between the core portion 11 and the second flange portion 31. Therefore, even if the second conductor 60 has intersection positions at the boundary portion between the core portion 11 and the first flange portion 21, the orientation of the coil component 10 can be determined by optical observation.

[0090] • The second crossing position CR2 in the second conductor 60 is not necessary. Depending on the location of the 35th turn of the second conductor 60, the 35th turn of the first conductor 50, and the positions of the external electrodes, the second crossing position CR2 can be omitted.

[0091] • The portion of the 35th turn of the second conductor 60 on the second end 62 side, compared to the first crossing position CR1, may not be wound on a specific side 11A between the valleys of the 34th turns of the first conductor 50 and the 34th turns of the second conductor 60. For example, this portion may be directly wound onto the core portion 11 between the 34th turns of the first conductor 50 and the 34th turns of the second conductor 60. Alternatively, it may be wound between the valleys of adjacent turns that are different from the 34th turns of the first conductor 50 and the 34th turns of the second conductor 60.

[0092] • The second conductor 60 may also have a first crossing position CR1 on a turn other than the thirty-fifth turn. In other words, the j-th turn of the second conductor 60 may not be the turn preceding the final turn.

[0093] Specifically, in Figure 5 In the example shown, from the (i-3)th turn to the (i+4)th turn of the first conductor 50, the number of turns increases sequentially, and the conductor is located further to the second flange 31 side in the direction along the central axis C. Similarly, although not shown in the figure, from the first turn to the (i-4)th turn of the first conductor 50, the number of turns increases sequentially, and the conductor is located further to the second flange 31 side in the direction along the central axis C. Furthermore, from the (i-3)th turn to the midpoint of the i-th turn of the first conductor 50, the conductors are wound adjacent to each other in the direction along the central axis C. From the (i+1)th turn to the (i+4th turn) of the first conductor 50, the conductors are wound adjacent to each other in the direction along the central axis C. Moreover, from the midpoint of the i-th turn to the (i+1)th turn of the first conductor 50, the conductors are arranged at intervals relative to the other turns of the first conductor 50 adjacent in the positive direction X1. Therefore, from the (i-3)th turn to the (i+4)th turn of the first conductor 50, the conductors belong to the first layer L1. Furthermore, in... Figure 5 The spacing between adjacent turns of the first conductor 50 is exaggerated in the illustration. Although the illustration is omitted, from the (i+5)th turn to the last turn of the first conductor 50, the number of turns increases sequentially as it is wound closer to the second flange 31 side in the direction along the central axis C.

[0094] Although the illustration is omitted, from the first turn to the (j-4)th turn of the second conductor 60, it is wound between the valleys of adjacent turns of the first conductor 50. (See diagram below.) Figure 5As shown, the (j-3)th turn of the second conductor 60 is located between the (i-3)th and (i-2)th turns of the first conductor 50. The (j-2)th turn of the second conductor 60 is located between the (i-2)th and (i-1)th turns of the first conductor 50. Up to the middle of the (j-1)th turn of the second conductor 60, it is located between the (i-1)th and (i)th turns of the first conductor 50. Therefore, the middle section from the (j-3)th turn to the (j-1)th turn of the second conductor 60 belongs to the second layer L2.

[0095] The j-th turn of the second conductor 60 is directly wound onto the core portion 11 in the negative direction X2 side relative to the i-th turn of the first conductor 50. Furthermore, up to the middle of the (j+1)-th turn of the second conductor 60, it is directly wound onto the core portion 11 between the j-th turn of the second conductor 60 and the (i+1)-th turn of the first conductor 50. Therefore, the j-th turn of the second conductor 60 has a first crossing position CR1 that intersects with the i-th turn of the first conductor 50 from the outside. Starting from the middle of the (j+1)-th turn of the second conductor 60, it is directly wound onto the core portion 11 between the i-th turn of the first conductor and the j-th turn of the second conductor. Therefore, this portion of the (j+1)-th turn of the second conductor 60 is a specific portion SP. Thereafter, the (j+1)-th turn of the second conductor 60 crosses relative to the j-th turn of the second conductor 60. That is, the (j+1)-th turn of the second conductor 60 has a third crossing position CR3.

[0096] The (j+2)th turn of the second conductor 60 is located between the (i+1)th and (i+2)th turns of the first conductor 50. The (j+3)th turn of the second conductor 60 is located between the (i+2)th and (i+3)th turns of the first conductor 50. The (j+4)th turn of the second conductor 60 is located between the (i+3)th and (i+4)th turns of the first conductor 50. Moreover, although the illustration is omitted, from the (j+5)th turn to the final turn of the second conductor 60, it is wound between the adjacent turns of the first conductor 50.

[0097] • In addition, in Figure 5 In the modified example shown, the second conductor 60 can be wound around the valley between the j-th turn of the second conductor 60 and the (i+1)-th turn of the first conductor 50, up to the middle of the (j+1)-th turn.

Claims

1. A coil component, wherein, have: Columnar core portion; The first flange portion is provided at the first end of the core portion along the central axis direction; The second flange portion is provided at the second end of the core portion on the side opposite to the first end; The first external electrode and the second external electrode are disposed on the first flange portion; The third and fourth external electrodes are disposed on the second flange portion; A first wire is wound around the core portion, with its first end connected to the first external electrode and its second end connected to the third external electrode. as well as The second wire is wound in the core portion 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. Regarding the aforementioned first wire and second wire, each time the wire is wound around the central axis from the first wire end toward the second wire end, the number of turns increases by one. The j-th turn of the second conductor has a first intersection position that intersects the i-th turn of the first conductor from the outside, where j is an integer greater than or equal to 2 and i is an integer greater than or equal to 2. The (j+1)th turn of the second conductor has a specific portion located between the i-th turn of the first conductor and the j-th turn of the second conductor in the direction along the central axis of the core portion. Compared to the specific portion, the (j+1)th turn of the second conductor crosses the jth turn of the second conductor from the outside on the end side of the second conductor.

2. The coil component according to claim 1, wherein, The aforementioned core portion is a polygonal prism shape. When one of the sides of the aforementioned core portion is designated as a specific side, and one of the two edges between the specific side and the other adjacent sides is designated as a first edge, and the other is designated as a second edge, As the second conductor moves from the first wire end toward the second wire end, it passes along the specific side surface in the order of the first ridge line and the second ridge line. The aforementioned specific portion of the second conductor includes the portion located on the aforementioned first ridge line.

3. The coil component according to claim 1 or 2, wherein, The (j+1)th turn of the second conductor is the final turn of the second conductor.

4. The coil component according to any one of claims 1 to 3, wherein, The aforementioned core portion is a polygonal prism shape. When one of the sides of the aforementioned core portion is designated as a specific side... The first turn of the second conductor and the portion on the end side of the first conductor, compared to the first turn, do not have a position that crosses the first conductor on the specific side.

5. The coil component according to claim 1, wherein, The (j-1)th turn of the second conductor has a portion wound between the valleys of adjacent turns of the first conductor. The (j+2)th turn of the second conductor has a portion that is wound between the valleys of the adjacent turns of the first conductor.

6. The coil component according to claim 5, wherein, From the first turn to the (j-1)th turn of the second conductor, it is wound between the valleys of adjacent turns of the first conductor. The second conductor, from the (j+2)th turn to the final turn, is wound between the adjacent turns of the first conductor.

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