COIL COMPONENT

Abstract

Each time a first wire 50 is wound around a central axis in the direction from a first wire end to a second wire end, forming a turn, the number of turns of the first wire 50 increases by one. Similarly, each time a second wire 60 is wound around the central axis in the direction from a first wire end to a second wire end, forming a turn, the number of turns of the second wire 60 increases by one. In this case, a 35th turn of the second wire 60 has a first intersection point CR1, where the 35th turn of the second wire 60 crosses the 35th turn of the first wire 50 on the outside, and a second intersection point CR2, where the 35th turn of the second wire 60 crosses the 34th turn of the second wire 60 outside.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention

[0001] The present invention relates to a coil component. 2. Description of the state of the art

[0002] A common-mode filter described in Japanese unpublished patent application No. 2018-120885 comprises a drum-shaped core, a first wire, and a second wire. The drum-shaped core includes a winding core section with a square prism shape, a first flange section provided at a first end of the winding core section, and a second flange section provided at a second end of the winding core section. The first wire is wound around the winding core section. The second wire is wound around the winding core section outside of the first wire. Furthermore, a predetermined turn of the second wire has a crossing point where the first wire and the second wire intersect. BRIEF SUMMARY OF THE INVENTION

[0003] In the common-mode filter described in the unpublished Japanese patent application No. 2018-120885, the second wire is pressed firmly against the first wire at the point where the first and second wires cross. This pressure causes the coatings of the respective wires to melt at the crossing point, resulting in a short circuit.

[0004] To solve the problem mentioned above, a coil component comprises: a winding core section having a columnar shape; a first flange section provided at a first end of the winding core section in a direction along a central axis of the winding core section; a second flange section provided at a second end of the winding core section opposite the first end; a first outer electrode and a second outer electrode provided on the first flange section; a third outer electrode and a fourth outer electrode provided on the second flange section; a first wire wound around the winding core section, the first wire having a first wire end and a second wire end, the first wire end of the first wire being connected to the first outer electrode and the second wire end of the first wire being connected to the third outer electrode; and a second wire,which is wound around the core section in the same direction as the first wire, the second wire having a first wire end and a second wire end, the first wire end of the second wire being connected to the second outer electrode and the second wire end of the second wire being connected to the fourth outer electrode. Each time the first wire is wound around the central axis in the direction from the first wire end to the second wire end, forming a turn, the number of turns of the first wire increases by one, and each time the second wire is wound around the central axis in the direction from the first wire end to the second wire end, forming a turn, the number of turns of the second wire increases by one, a j-th turn (j is a positive integer of 2 or more) of the second wire has a first crossing point.where the j-th turn of the second wire crosses the i-th turn of the first wire outside an i-th turn (i is a positive integer of 2 or more) of the first wire, and has a second crossing point where the j-th turn of the second wire crosses the (j-1)-th turn of the second wire outside a (j-1)-th turn of the second wire.

[0005] It is possible to prevent the first crossing point and the second crossing point of the second wire from being pressed against the first wire with excessive force. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a perspective view of a coil component; Fig. Figure 2 is a schematic end view of the coil component along an end surface which contains a central axis and is orthogonal to a left-right axis, the schematic end view illustrating the winding of the respective wires; Fig. 3 is a partially enlarged view of Fig. 2; Fig. 4 is a schematic top view of the coil component, illustrating the winding of the respective wires; Fig. 5 is a schematic top view of a coil component in a modification example; Fig. 6 is a schematic top view of a coil component in a modification example; and Fig. Figure 7 is a schematic top view of a coil component in a modification example. DESCRIPTION OF PREFERRED DESIGNS Design of the coil component

[0006] The following describes an embodiment of a coil component. In some cases, the figures are enlarged for clarity. The relative sizes of the components may differ from those of the actual components or from those shown in other figures. Overall configuration

[0007] As in Fig. As shown in Figure 1, a coil component 10 comprises a drum core 10C and a plate core 10F.

[0008] The drum core 10C comprises a winding core section 11, a first flange section 21 and a second flange section 31.

[0009] The winding core section 11 has a square prism shape, the section of which has a rectangular shape.

[0010] This means that the winding core section 11 has four side surfaces. The material for the winding core section 11 is, for example, Ni-Zn-based ferrite.

[0011] The first flange section 21 is provided at a first end of the winding core section 11 in a direction along a central axis C of the winding core section 11. In particular, the first flange section 21 is connected to the first end of the winding core section 11 in a direction along the central axis C. The second flange section 31 is provided at a second end of the winding core section 11 in a direction along the central axis C. In particular, the second flange section 31 is connected to the second end of the winding core section 11 in a direction along the central axis C. The material for the first flange section 21 and the second flange section 31 is the same as that for the winding core section 11. Furthermore, the first flange section 21 and the second flange section 31 are integrally formed with the winding core section 11.

[0012] Here, an axis parallel to the central axis C is a core axis X. Furthermore, a specific axis that runs orthogonally to the core axis X is an up-down axis Y. In the present embodiment, the up-down axis Y extends in one direction orthogonal to a mounting surface when the coil component 10 is mounted on a circuit board. Furthermore, an axis that is orthogonal to both the core axis X and the up-down axis Y is a left-right axis Z. Then, a direction along the core axis X is a positive direction X1, and the direction opposite to the positive direction X1 is a negative direction X2. In the present embodiment, the positive direction X1 corresponds to a direction from the winding core section 11 to the first flange section 21. The negative direction X2 corresponds to a direction from the winding core section 11 to the second flange section 31.Furthermore, a direction along the up-down axis Y is an upward direction Y1, and the opposite direction to the upward direction Y1 is a downward direction Y2. Similarly, a direction along the left-right axis Z is a right direction Z1, and the opposite direction to the right direction Z1 is a left direction Z2. The labels for upward direction Y1 and downward direction Y2 were chosen here for simplicity and do not indicate the direction of gravity. Likewise, the labels for right direction Z1 and left direction Z2 were also chosen for simplicity and do not indicate the left-right direction from any particular perspective.

[0013] The shape of a section of the winding core section 11, orthogonal to the central axis C, is rectangular. That is, the area of ​​each of the two faces of the four faces of the winding core section 11 is larger than the area of ​​the other two faces. Therefore, one of the faces with the larger area is oriented upwards in the direction Y1. The other face with the larger area is oriented downwards in the direction Y2.

[0014] The following is how in Fig. As shown in Figure 2, the upward-facing side surface Y1 is a specific side surface 11A, and the side surface opposite specific side surface 11A is an opposite surface 11B. Specific side surface 11A need not necessarily be a planar surface whose entire area is orthogonal to the up-down axis Y. That is, the surface of the winding core section 11 that is visible when the coil component 10 is viewed from the upward-direction Y1 side of the coil component 10 in the downward direction Y2 is specific side surface 11A. Furthermore, as shown in Fig. Figure 4 shows that of the two edge lines between the specific face 11A and the other adjacent faces, the edge line on the left side in the direction of Z2 is a first edge line R1. Furthermore, of the edge lines between the specific face 11A and the other faces, the edge line on the right side in the direction of Z1 is a second edge line R2.

[0015] As in Fig. As shown in Figure 1, the first flange section 21 projects outwards from the winding core section 11 in the direction of the up-down axis Y and the left-right axis Z when viewed in the direction of the central axis C. The first flange section 21 has a shape that is symmetrical about an imaginary plane containing the central axis C and orthogonal to the left-right axis Z.

[0016] The first flange section 21 comprises a main body 22 and a recessed section 23. The main body 22 has a cuboid shape, with a thin thickness along the central axis C. Viewed in the negative direction X2, the respective edges of the main body 22 on the upward direction Y1 and the downward direction Y2 are parallel to the left-right axis Z. Furthermore, viewed in the negative direction X2, the respective edges of the main body 22 on the left direction Z2 and the right direction Z1 are parallel to the up-down axis Y.

[0017] The recessed section 23 extends downwards in the Y2 direction from the top of the main body 22. The dimension of the recessed section 23 along the left-right axis Z is reduced in the downward direction Y2. The recessed section 23 is located essentially in the center of the main body 22 along the left-right axis Z. The dimension of the recessed section 23 along the central axis C corresponds to the dimension of the main body 22 along the central axis C. That is, the portion of the first flange section 21 on the side in the upward direction Y1 is shaped such that it is divided into two parts, between which the recessed section 23 is located.

[0018] The second flange section 31 and the first flange section 21 have a shape that is symmetrical about an imaginary plane passing through the center of the winding core section 11 along the central axis C and is orthogonal to the central axis C. That is, the second flange section 31 projects outward from the winding core section 11 in the direction of the up-down axis Y and the left-right axis Z when viewed along the central axis C. The second flange section 31 then comprises a main body 32 and a recessed section 33. The configuration of the main body 32 and the recessed section 33 of the second flange section 31 is the same as that of the main body 22 and the recessed section 23 of the first flange section 21. That is, the recessed section 33 is recessed downwards in the Y2 direction from a top surface of the main body 32.

[0019] The plate core 10F has a rectangular, plate-like shape. The longitudinal sides of the plate core 10F are parallel to the central axis C. The transverse sides of the plate core 10F are parallel to the left-right axis Z. The plate core 10F is located on the downward side Y2 of the drum core 10C. The plate core 10F is connected to both a bottom surface of the first flange section 21 and a bottom surface of the second flange section 31. That is, the plate core 10F connects the first flange section 21 and the second flange section 31. The material for the plate core 10F is the same as the material for the drum core 10C. Although not shown, an adhesive is applied between the plate core 10F and the first flange section 21 and the second flange section 31, respectively.

[0020] As in Fig. As shown in Figure 1, the coil component 10 comprises a first outer electrode 41, a second outer electrode 42, a third outer electrode 43 and a fourth outer electrode 44.

[0021] The first external electrode 41 is provided on the first flange section 21. That is, the first external electrode 41 is attached to a surface of the first flange section 21. The first external electrode 41 is located on the surface of the first flange section 21 on the upward side Y1 and on the left side Z2 of the recessed section 23.

[0022] The second external electrode 42 is provided on the first flange section 21. That is, the second external electrode 42 is attached to a surface of the first flange section 21. The second external electrode 42 is located on the surface of the first flange section 21 on the upward direction Y1 and on the right-hand direction Z1 side of the recessed section 23.

[0023] The third external electrode 43 is provided on the second flange section 31. That is, the third external electrode 43 is attached to a surface of the second flange section 31. The third external electrode 43 is located on the surface of the second flange section 31 on the upward direction side Y1 and on the leftward direction side Z2 of the recessed section 33.

[0024] The fourth external electrode 44 is provided on the second flange section 31. That is, the fourth external electrode 44 is attached to a surface of the second flange section 31. The fourth external electrode 44 is located on the surface of the second flange section 31 on the upward direction Y1 side and is located on the right-hand direction Z1 side of the recessed section 33.

[0025] Although not shown, the first outer electrode 41 to the fourth outer electrode 44 each comprise a metal layer and a plating layer. For example, the metal layer is a layer containing silver as the main component. For example, the plating layer is formed by a plurality of layers, such as a layer containing copper as the main component, a layer containing nickel as the main component, and a layer containing tin as the main component. In the present embodiment, the surfaces of the coil component 10 on which the first outer electrode 41 to the fourth outer electrode 44 are provided are surfaces facing a circuit board when the coil component 10 is mounted on the circuit board. Fig. Figure 1 shows the first outer electrode 41 to the fourth outer electrode 44 with a long dashed double short-dash line. Configuration of the first wire and the second wire

[0026] As in Fig. As shown in Figure 1, the coil component 10 comprises a first wire 50 and a second wire 60. The first wire 50 and the second wire 60 comprise parts that are wound around the winding core section 11. Fig. Figure 1 simplifies the winding structure of the parts wound around the core section 11 of the first wire 50 and the second wire 60, and shows the winding structure as a tubular object formed by integrating the respective turns of each wire.

[0027] Although not shown, the first wire 50 comprises a conductor and an insulating coating. The insulating coating covers an outer circumferential surface of the conductor. A section of the first wire 50 that is orthogonal to the direction in which the first wire 50 extends has a substantially circular shape. The first wire 50 has a first wire end 51 and a second wire end 52, which is opposite the first wire end 51. In each figure, the first wire 50 is colored with dots.

[0028] As in Fig. As shown in Figure 1, the first wire end 51 of the first wire 50 is connected to the first outer electrode 41. The second wire end 52 of the first wire 50 is connected to the third outer electrode 43. Tracing the first wire 50 from the first wire end 51 to the second wire end 52, the position where the first wire 50 first comes into contact with an outer circumferential surface of the winding core section 11 is the position of one 1.0 turn of the first wire 50. In the present embodiment, the position of the first 1.0 turn of the first wire 50 is located on the second edge line R2 of the winding core section 11.

[0029] As in Fig. As shown in Figure 2, the number of turns of the first wire 50 increases by one each time the first wire 50 is wound around the central axis C in the direction from the first wire end 51 to the second wire end 52, forming a turn. Viewed in the negative direction X2, the first wire 50 is wound clockwise around the winding core section 11 with an increasing number of its turns. As shown in Figure 2, the number of turns of the first wire 50 increases. Fig. As shown in Figure 4, when following the first wire 50 from the first wire end 51 to the second wire end 52, the first edge line R1 and the second edge line R2 pass in this order on the specific side surface 11A.

[0030] In particular, for example, when viewed in the negative direction X2, the position of the first wire 50, which is shifted 36 degrees clockwise around the central axis C from the position of the 1.0 turn of the first wire 50, is the position of a 1.1 turn of the first wire 50. Furthermore, a first turn of the first wire 50 represents a portion of the first wire 50 from the position of the 1.0 turn of the first wire 50 to a position immediately before the position of a 2.0 turn of the first wire 50. Moreover, the last turn of the first wire 50 is a turn that includes the position at which the first wire 50 last comes into contact with the outer circumferential surface of the winding core section 11 when tracing the first wire 50 from the first wire end 51 to the second wire end 52. Fig. Numbers 2 to 4 indicate any part of the first turn within the area of ​​the first turn as "1". The same applies to cases with other numbers of turns. In some cases, the values ​​in the Fig. The number of turns shown (2 to 4) does not correspond to the number of turns counted during manufacturing, starting from the first turn. Furthermore, it shows Fig. 4 not every wire on the specific side surface 11A as a thick wire, but as a simplified line. Fig. Figure 4 shows the first wire 50 as a dashed line and the second wire 60 as a solid line.

[0031] As in Fig. As shown in Figure 1, the second wire 60 has the same configuration as the first wire 50. That is, the second wire 60 comprises a conductor and an insulating coating. The insulating coating covers an outer surface of the conductor. A section of the second wire 60 that is orthogonal to the direction in which the second wire 60 extends has an essentially circular shape. The second wire 60 has a first wire end 61 and a second wire end 62 that is opposite the first wire end 61.

[0032] As in Fig. As shown in Figure 1, the first end of the second wire 60 is connected to the second outer electrode 42. The second end of the second wire 60 is connected to the fourth outer electrode 44. If one traces the second wire 60 from the first wire end 61 to the second wire end 62, the position at which the angular position of the second wire 60 about the central axis C first corresponds to the angular position of the first 1.0 turn of the first wire 50 is the position of a 1.0 turn of the second wire 60. That is, in the present embodiment, the position of the 1.0 turn of the second wire 60 lies on a half-line extending from the central axis C to the second edge line R2 of the winding core section 11, when viewed in the direction along the central axis C.

[0033] As in Fig. As shown in Figure 2, the number of turns of the second wire 60 increases by one each time the second wire 60 is wound around the central axis C in the direction from the first wire end 61 to the second wire end 62, forming one turn. Viewed in the negative direction X2, the second wire 60 is wound clockwise around the core section 11 with each additional turn. That is, the second wire 60 is wound around the core section 11 in the same direction as the first wire 50. As shown in Figure 2, the number of turns of the second wire 60 increases by one each time the second wire 60 is wound around the core section 11 in the direction from the first wire 61 to the second wire 62. Fig. 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 the first edge line R1 and the second edge line R2 in that order on the specific face 11A. The way in which the turns of the second wire 60 are counted is the same as for the first wire 50.

[0034] In the following, the parts of the first wire 50 and the second wire 60 that are wound directly around the winding core section 11 form a first layer L1. Here, the state "wound directly" can be the state in which the wires are spaced away from the winding core section 11, in addition to the state in which they are in contact with the outer circumferential surface of the winding core section 11, and also includes the state in which one wire is wound around the winding core section 11 without the other wire being arranged in between.

[0035] Furthermore, the parts of the first wire 50 and the second wire 60 that are wound around the outer surface in a direction orthogonal to the central axis C, between the parts of the wire of the first layer L1 that adjoin each other in the direction along the central axis C, form a second layer L2. Furthermore, the parts of the first wire 50 and the second wire 60 that are wound around the outer surface in a direction orthogonal to the central axis C, between the parts of the wire of the second layer L2 that adjoin each other in the direction along the central axis C, form a third layer L3. Specific winding of the first wire and the second wire

[0036] As in Fig. As shown in Figure 2, essentially all turns of the first wire 50 belong to the first layer L1. The first to the 36th turn of the first wire 50 are wound. That is, the last turn of the first wire 50 is the 36th turn.

[0037] The first to the 36th turns of the first wire 50 are wound in such a sequence that, in the direction along the central axis C, they are closer to the second flange section 31 the higher the turn number. Furthermore, the first turn up to a portion of the 35th turn of the first wire 50 are wound side by side in the direction along the central axis C. Then, the portion of the 35th turn up to the 36th turn of the first wire 50 is arranged so that it is spaced apart from another turn of the first wire 50 that is adjacent in the positive direction X1. Then, as described below, the second wire 60 is arranged in this space.

[0038] Here, the condition of "being wound side by side" is not limited to the case where the adjacent windings of the wire are in contact with each other. Even if the adjacent windings of the wire are not in contact with each other, one can say that the windings of the wire are side by side, provided that the other wire is not on a line that connects the centers of the adjacent parts of the wire in the final view.

[0039] The first turn up to the 36th turn of the second wire 60 are wound. That is, the last 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 includes a portion belonging to the first layer L1 and a portion belonging to the third layer L3.

[0040] The portion of the second wire 60 that is closer to the first wire end 61 than the 1.0 turn is not located on the specific side surface 11A. Thus, the portion of the second wire 60 that is closer to the first wire end 61 than the 1.0 turn does not include any part that crosses the first wire 50 on the specific side surface 11A. Furthermore, the entire area of ​​the first turn of the second wire 60 is located on the outside between the first turn and a second turn of the first wire 50. Thus, the first turn of the second wire 60 does not include any part that crosses the first wire 50 on the specific side surface 11A.

[0041] A second turn of the second wire 60 is located outside between the second turn and a third turn of the first wire 50. A third turn of the second wire 60 is located outside between the third turn and a fourth turn of the first wire 50. In this way, within the region from the first turn to part of a 19th turn of the second wire 60, an nth turn of the second wire 60 is wound outside between an nth turn and an (n+1)th turn of the first wire 50. Here, "n" is a positive integer of 1 or more and 19 or less. Thus, the first turn up to part of the 19th turn of the second wire 60 belongs to the second layer L2.

[0042] The other part of the 19th turn of the second wire 60 is extended in the positive direction X1. Specifically, the portion of the 19th turn of the second wire 60 on the opposite surface 11B is wound externally between a 19th turn and a 20th turn of the first wire 50. Then, the 19th turn of the second wire 60 is extended towards the first flange section 21 and wound externally between a 16th turn and a 17th turn of the second wire 60 on the specific side surface 11A. Thus, the 19th turn of the second wire 60 intersects an 18th turn and a 17th turn of the second wire 60 on the side surface facing left Z2.

[0043] A 20th turn of the second wire 60 is wound externally between the 17th and 18th turns of the second wire 60. A portion of a 21st turn of the second wire 60 is wound externally between the 18th and 19th turns of the second wire 60. Then, the 21st turn of the second wire 60 is wound around the external surface 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 surface 11B is wound around the external surface between the 18th and 19th turns of the second wire 60. Then, the portion of the 21st turn of the second wire 60 is wound on the specific side surface 11A of the external surface e between the 19th and 20th turns of the first wire 50. Thus, the 21st turn of the second wire 60 crosses the 19th turn of the second wire 60 on the side surface facing left Z2. In this way, the other part of the 19th turn belongs to the 19th turn of the second wire 60.Winding up to part of the 21st winding of the second wire 60 to the third layer L3.

[0044] A 22nd turn of the second wire 60 is located externally between the 20th turn and a 21st turn of the first wire 50. Furthermore, a 23rd turn of the second wire 60 is located externally between the 21st turn and a 22nd turn of the first wire 50. Thus, within the region from the 22nd turn to part of the 27th turn of the second wire 60, an nth turn of the second wire 60 is wound externally between an (n-2)th turn and an (n-1)th turn of the first wire 50. Here, n is a positive integer of 22 or more and 27 or less.

[0045] The 27th turn of the second wire 60 crosses a 26th turn and a 27th turn of the first wire 50 on the specific side surface 11A in the direction from the first flange section 21 to the second flange section 31.

[0046] A 28th turn of the second wire 60 is located externally between a 28th and a 29th turn of the first wire 50. Furthermore, a 29th turn of the second wire 60 is located externally between a 29th and a 30th turn of the first wire 50. Thus, within the region from the 28th turn to part of the 34th turn of the second wire 60, an nth turn of the second wire 60 is wound externally between an nth turn and an (n+1)th turn of the first wire 50. Here, n is a positive integer of 28 or more and 34 or less. Additionally, the remaining portion of the 21st turn up to part of the 34th turn of the second wire 60 belongs to the second layer L2.

[0047] As in Fig. As shown in Figure 3, the part of the 34th turn of the second wire 60, which is located on the specific side surface 11A, is wound directly around the winding core section 11 between a 34th turn and the 35th turn of the first wire 50.

[0048] As in Fig. As shown in Figure 4, a portion of the 35th turn of the second wire 60 borders the 35th turn of the first wire 50 in the negative direction X2 and is wound directly around the core section 11. The 35th turn of the second wire 60 then has a first intersection point CR1, where the 35th turn of the second wire 60 crosses the 35th turn of the first wire 50 on the outside of the specific side surface 11A. As shown in Fig. As shown in Figure 3, the 35th turn of the second wire 60, which belonged to the first layer L1, is located near the first intersection point CR1, on the 35th turn of the first wire 50 and forms the second layer L2.

[0049] As in Fig. 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 crossing point CR1 has a second crossing point CR2, where the 35th turn of the second wire 60 on the outside of the 34th turn of the second wire 60 crosses the 34th turn of the second wire 60 on the specific side surface 11A. If one then traces the second wire 60 from the first crossing point CR1 to the second crossing point CR2 in the direction from the first wire end 61 to the second wire end 62, the second wire 60 extends from the second flange section 31 to the first flange section 21. In other words, the second crossing point CR2 is located on the positive direction X1 side of the first crossing point CR1. Then the part of the 35th turn of the second wire 60 from the second crossing point CR2 to a position immediately before the 36th turn around the outside between the 34thThe first wire is wound 50 turns and the second wire 60 turns are wound 34 turns.

[0050] Part of the 36th turn of the second wire 60 is wound externally between the 35th turn of the first wire 50 and the 35th turn of the second wire 60. The other part of the 36th turn of the second wire 60 is a specific part SP that is wound directly around the winding core section 11. This specific part SP is located between the 35th turn of the first wire 50 and the 35th turn of the second wire 60 along the central axis C of the winding core section 11. Furthermore, the specific part SP includes a portion that lies on the first edge line R1 of the winding core section 11.

[0051] The portion of the second wire 60 that is closer to the second wire end 62 than the specific portion SP is separated from the side surface of the winding core section 11 and extends to the fourth outer electrode 44. The second wire end 62 of the second wire 60 is then connected to the fourth outer electrode 44. As a result, the portion of the 36th turn of the second wire 60 that is closer to the second wire end 62 than the specific portion SP has a third crossing point CR3, where the 36th turn of the second wire 60 crosses the 35th turn of the second wire 60 on the outside. The third crossing point CR3 is then located on the specific side surface 11A.

[0052] The 35th and 36th turns of the second wire 60 do not touch at the third crossing point CR3. That is, at the third crossing point CR3, the 36th turn of the second wire 60 is located away from the 35th turn of the second wire 60 in the upward direction Y1. In this way, for example, it is sufficient for the "crossing point" to be a point where the two wires cross in a direction orthogonal to the specific side surface 11A, and the two wires do not need to be in contact with each other.

[0053] As described above, the second wire 60 has the first crossing point CR1, the second crossing point CR2, the third crossing point CR3, and other crossing points on the specific side surface 11A. Furthermore, the second wire 60 has crossing points on the side surface facing to the left of the side surfaces of the winding core section 11 in the direction Z2. On the other hand, the second wire 60 has no crossing points on the opposite surface 11B.

[0054] Here, i is 35 and j is 35. In this case, the (j+1)th turn of the second wire 60 is the last turn of the second wire 60. If i is 35 and j is 35, a j-th turn of the second wire 60 has the first crossing point CR1, where the j-th turn of the second wire 60 crosses the i-th turn of the first wire 50 on the outside of an i-th turn of the first wire 50. Furthermore, the j-th turn of the second wire 60 has the second crossing point CR2, where the j-th turn of the second wire 60 crosses the (j-1)th turn of the second wire 60 outside of a (j-1)th turn of the second wire 60. Effects of the design

[0055] The above embodiment achieves the following effects.

[0056] In the embodiment described above, the 35th turn of the second wire 60 has a second crossing point CR2 in addition to the first crossing point CR1. Thus, the force pushing the 35th turn of the second wire 60 towards the central axis C is distributed not only to the first crossing point CR1 but also to the second crossing point CR2. Accordingly, it is possible to prevent either crossing point from being pushed by an excessive force.

[0057] (2) In the embodiment above, the last turn of the second wire 60 is the 36th turn. In other words, the first crossing point CR1, the second crossing point CR2, and the third crossing point CR3 are concentrated on the last turn and the turn immediately preceding the last turn of the second wire 60. Thus, for example, by optically observing the boundary between the core section 11 and the second flange section 31, it is possible to determine the direction in which the specific side face 11A of the core section 11 points, i.e., the position of the coil component 10.

[0058] (3) In the embodiment above, the first turn and the portion closer to the first wire end 61 than the first turn of the second wire 60 do not include a portion that crosses the first wire 50 on the specific side surface 11A. On the other hand, the second wire 60, as described above, has several crossing points at the interface between the core section 11 and the second flange section 31. Thus, by optically observing each wire on the specific side surface 11A of the core section 11, it is possible to identify the orientation of the coil component 10.

[0059] (4) In the embodiment above, the first crossing point CR1, the second crossing point CR2, and the third crossing point CR3 of the second wire 60 are all located on the specific side surface 11A. Thus, it is possible to observe the first crossing point CR1, the second crossing point CR2, and the third crossing point CR3 of the second wire 60 by optically observing only the specific side surface 11A of the winding core section 11. That is, it is possible to determine whether each wire is wound as intended without observing the coil component 10 from different angles.

[0060] (5) In the embodiment above, if the second wire 60 is traced from the first crossing point CR1 to the second crossing point CR2 in the direction from the first wire end 61 to the second wire end 62, it extends from the second flange section 31 to the first flange section 21. In other words, the portion of the second wire 60 from the first crossing point CR1 to the second crossing point CR2 is wound in the opposite direction to the direction in which the other portion is wound. The number of turns of the second wire 60 can be increased by winding the portion near the crossing points of the second wire 60 in the opposite direction in this manner.

[0061] (6) In the embodiment above, the 35th turn of the second wire 60 has the first crossing point CR1. Thus, a space is formed 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 includes the specific part SP. The specific part SP is then wound directly around the winding core section 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 section 11. That is, a space on the positive direction X1 side of the 35th turn of the second wire 60 is used as the space for winding the 36th turn. This winding structure contributes to a high-density winding of the second wire 60.

[0062] The portion of the 36th turn of the second wire 60 that is closer to the second wire end 62 than the specific portion SP has the third crossing point CR3, where the 36th turn of the second wire 60 crosses the 35th turn of the second wire 60 on the outside. In this way, the second wire end 62 of the second wire 60 can be connected to the fourth outer electrode 44 by crossing the second wire 60 again. Then, at the third crossing point CR3, the second wire 60 is separated from the first wire 50 in the upward direction Y1. Thus, the dimension of the winding core section 11 in the direction along the central axis C does not necessarily have to include a dimension for the third crossing point CR3 of the second wire 60.

[0063] (7) In the above embodiment, the specific part SP of the second wire 60 comprises the portion located on the first edge line R1 of the winding core section 11. The second wire 60 is pressed against the winding core section 11 on the first edge line R1 with a comparatively large force. Thus, with the above configuration, it is possible to prevent the occurrence of a winding deviation around the specific part SP.

[0064] (8) In the embodiment above, the portion of the 35th turn of the second wire 60 that is closer to the second wire end 62 than the first crossing point CR1 is wound externally between two adjacent turns. In particular, this portion is wound externally between the 34th turn of the first wire 50 and the 34th turn of the second wire 60. Thus, part of the force that pushes the second wire 60 toward the central axis C is distributed across the 34th turn of the first wire 50 and the 34th turn of the second wire 60. This prevents, for example, the first crossing point CR1 of the second wire 60 from being pressed against the first wire 50 by an excessive force.

[0065] (9) The portion of the 35th turn of the second wire 60 that is closer to the second wire end 62 than the first crossing point CR1 is wound on the outside between identical turns of the first wire 50 and the second wire 60. Thus, the first wire 50 and the second wire 60 do not need to have a complex turn. Modification examples

[0066] Modifications to the above embodiment can be implemented as described below. Combinations of the above embodiment and the following modification examples can be implemented without technical inconsistencies.

[0067] In the embodiment described above, the configuration of the coil component 10 can be modified accordingly. For example, the coil component 10 need not include the plate core 10F. Furthermore, the shape of the plate core 10F is not limited to a rectangular, plate-like shape. For example, the plate core 10F can have an elliptical, plate-like shape. In addition, instead of the plate core 10F, a resin coating material can be used that covers the underside of the first flange section 21, the underside of the second flange section 31, and the opposite surface 11B of the winding core section 11.

[0068] In the embodiment described above, the shape of the winding core section 11 is not limited to the example shown above. That is, the shape of the winding core section 11 is not limited to a quadrilateral prism whose section has a rectangular shape. For example, the shape of the winding core section 11 can be a quadrilateral prism whose section has a square shape, a quadrilateral prism whose section has a quadrilateral shape other than a rectangular shape and a square shape, or a polygonal prism shape other than a quadrilateral prism. Furthermore, the shape of the winding core section 11 can be a circular cylinder or an elliptical cylinder.

[0069] In the embodiment above, the side face with the larger area of ​​the side faces of the winding core section 11 is the specific side face 11A. However, a face with a smaller area can also be the specific side face 11A. Even if the winding core section 11 has a polygonal shape other than a quadrilateral prism, as in the modification example above, any one of the side faces can be freely selected as the specific side face 11A. If the winding core section 11 has a polygonal shape other than a quadrilateral prism, there may not be an opposite face 11B.

[0070] In the embodiment described above, the material for the drum core 10C and the plate core 10F is not limited to the example given in the embodiment above. For example, the material for the drum core 10C and the plate core 10F is not limited to Ni-Zn-based ferrite and can be Mn-Zn-based ferrite or other materials. Furthermore, the material for the drum core 10C and the plate core 10F can be, for example, ferrite, aluminum oxide, a synthetic resin, or a mixture of these materials.

[0071] In the embodiment described above, the configuration of the drum core 10C is not limited to the example shown. For example, the first flange section 21 need not have the recessed section 23. In this case, it is sufficient, for example, for the first outer electrode 41 and the second outer electrode 42 to be spaced apart. The same applies to the second flange section 31.

[0072] In the embodiment described above, the material and shape of the first outer electrode 41 to the fourth outer electrode 44 are not limited to the examples given. For example, the plating layer of each of the first outer electrode 41 to the fourth outer electrode 44 can be formed by a single conductive layer. Furthermore, each of the first outer electrode 41 to the fourth outer electrode 44 can have an exposed conductive metal layer without a plating layer. In addition, for example, each of the first outer electrode 41 to the fourth outer electrode 44 can be made of a sheet-like metal material.

[0073] In the embodiment above, the cross-sectional shape of the first wire 50 and the second wire 60 is not limited to the example of the embodiment above ( ). For example, the cross-sectional shape of the first wire 50 and the second wire 60 can be an elliptical shape or a rectangular shape.

[0074] In the embodiment described above, the number of last turns of the first wire 50 and the second wire 60 is not limited to the example given above. Furthermore, the number of last turns of the first wire 50 and the number of last turns of the second wire 60 need not necessarily be the same.

[0075] The specific part SP of the second wire 60 need not include the part located on the first edge line R1. For example, the specific part SP may only be present in the middle of the specific side face 11A of the winding core section 11. Furthermore, the second wire 60 need not include the specific part SP. In other words, the (j+1)th turn of the second wire 60 need not include the part that is wound directly around the winding core section 11 and is located between the i-th turn of the first wire 50 and the j-th turn of the second wire 60 in the direction along the central axis C.

[0076] The first turn of the second wire 60 and the portion closer to the first wire end 61 than the first turn of the second wire 60 can include a section that crosses the first wire 50 on the specific side surface 11A. In the embodiment described above, the second wire 60 has several crossing points at the interface between the core section 11 and the second flange section 31. Thus, even when the second wire 60 has crossing points at the interface between the core section 11 and the first flange section 21, it is possible to identify the orientation of the coil component 10 by optical observation.

[0077] The third crossing point CR3 of the second wire 60 is not strictly necessary. In some cases, the third crossing point CR3 can be omitted, for example, depending on the proximity of the 35th turn of the second wire 60, the proximity of the 35th turn of the first wire 50, and the position of each external electrode.

[0078] The portion of the 35th turn of the second wire 60 that is closer to the second wire end 62 than the first crossing point CR1 need not be wound externally 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 aforementioned portion can be wound directly around the winding core section 11 between the 34th turn of the first wire 50 and the 34th turn of the second wire 60. Furthermore, the aforementioned portion can be wound externally between adjacent turns that differ from the 34th turn of the first wire 50 and the 34th turn of the second wire 60.

[0079] A turn of the second wire 60, other than the 35th turn, may contain the first crossing point CR1. In other words, the j-th turn of the second wire 60 need not be the turn immediately before the last turn.

[0080] In particular, in the Fig. In the example shown, from the (i-3)th turn to the (i+4)th turn of the first wire 50 are wound in such a sequence that, in the direction along the central axis C, they are closer to the second flange section 31 the higher the turn number. Furthermore, the (i-3)th turn up to a portion of the i-th turn of the first wire 50 are wound side by side in the direction along the central axis C. The (i+1)th turn up to the (i+4)th turn of the first wire 50 are wound side by side in the direction along the central axis C. Then, the remaining portion of the i-th turn up to the (i+1)th turn of the first wire 50 is arranged such that it is spaced apart from another turn of the first wire 50 that is adjacent in the positive direction X1. Thus, the (i-3)th turn to the (i+4)th turn of the first wire 50 belong to the first layer L1. Fig. Figure 5 shows an exaggerated distance between adjacent turns of the first wire 50.

[0081] A (j-3)th turn of the second wire 60 is located on the outside between the (i-3)th turn and an (i-2)th turn of the first wire 50. A (j-2)th turn of the second wire 60 is located on the outside between the (i-2)th turn and the (i-1)th turn of the first wire 50. Part of the (j-1)th turn of the second wire 60 is located on the outside between the (i-1)th turn and the i-th turn of the first wire 50. Thus, the (j-3)th turn up to part of the (j-1)th turn of the second wire 60 belongs to the second layer L2.

[0082] The j-th turn of the second wire 60 is wound directly around the core section 11 on the negative side X2 of the i-th turn of the first wire 50. Then, the j-th turn of the second wire 60 is wound around the outside between the (i-1)-th turn of the first wire 50 and the (j-1)-th turn of the second wire 60, just before the (j+1)-th turn. Thus, the j-th turn of the second wire 60 has the first crossing point CR1, where the j-th turn of the second wire 60 crosses the i-th turn of the first wire 50 on the outside of the i-th turn of the first wire 50. Then the part of the j-th turn of the second wire 60 that is closer to the first wire end 61 than the first crossing point CR1 includes a part that is wound directly around the winding core section 11 on the specific side surface 11A.

[0083] Furthermore, the portion of the j-th turn of the second wire 60 that is closer to the end 62 of the second wire than the first crossing point CR1 includes a part that is wrapped around the outside between the (i-1)th turn of the first wire 50 and the (j-1)th turn of the second wire 60. Additionally, the j-th turn of the second wire 60 has the second crossing point CR2, where the j-th turn of the second wire 60 crosses the (j-1)th turn of the second wire 60 outside of the (j-1)th turn of the second wire 60.

[0084] Part of the (j+1)th turn of the second wire 60 is wound externally between the i-th turn of the first wire 50 and the j-th turn of the second wire 60. The other part of the (j+1)th turn of the second wire 60 is wound directly around the core section 11 between the i-th turn of the first wire 50 and the j-th turn of the second wire 60. That is, this part of the (j+1)th turn of the second wire 60 is the specific part SP. Then the (j+1)th turn of the second wire 60 has the third crossing point CR3, where the (j+1)th turn of the second wire 60 crosses the j-th turn of the second wire 60 on the outside. Then the third intersection point CR3 and the second intersection point CR2 and first intersection point CR1 described above are each located on the specific side surface 11A.

[0085] A (j+2)th turn of the second wire 60 is located on the outside between the (i+1)th turn and a (i+2)th turn of the first wire 50. A (j+3)th turn of the second wire 60 is located on the outside between the (i+2)th turn and a (i+3)th turn of the first wire 50. A (j+4)th turn of the second wire 60 is located on the outside between the (i+3)th turn and the (i+4)th turn of the first wire 50.

[0086] Furthermore, in the Fig. In the modification example shown in Figure 6, the first wire 50 is wound in the same way as in the one shown in Figure 6. Fig. In the modification example shown in Figure 5, the (j-3)th turn of the second wire 60 is located on the outside between the (i-3)th turn and the (i-2)th turn of the first wire 50. The (j-2)th turn of the second wire 60 is located on the outside between the (i-2)th turn and the (i-1)th turn of the first wire 50. The portion of the (j-1)th turn of the second wire 60 is located on the outside between the (i-1)th turn and the i-th turn of the first wire 50. Thus, the (j-3)th turn up to the portion of the (j-1)th turn of the second wire 60 belongs to the second layer L2.

[0087] The j-th turn of the second wire 60 is wound directly around the core section 11 on the negative direction X2 side of the i-th turn of the first wire 50. Then, the j-th turn of the second wire 60 is wound around the outside between the (i-1)-th turn of the first wire 50 and the (j-1)-th turn of the second wire 60, just before the (j+1)-th turn. Thus, the j-th turn of the second wire 60 has its first crossing point CR1, where the j-th turn of the second wire 60 crosses the i-th turn of the first wire 50 on its outer surface. Then the part of the j-th turn of the second wire 60 that is closer to the first wire end 61 than the first crossing point CR1 has the second crossing point CR2, where the j-th turn of the second wire 60 crosses the (j-1)-th turn of the second wire 60 on the outside of the (j-1)-th turn of the second wire 60.The first intersection point CR1 and the second intersection point CR2 are located on the specific side surface 11A.

[0088] Part of the (j+1)th turn of the second wire 60 is wound externally between the i-th turn of the first wire 50 and the j-th turn of the second wire 60. The other part of the (j+1)th turn of the second wire 60 is wound directly around the core section 11 between the j-th turn of the second wire 60 and the (i+1)th turn of the first wire 50.

[0089] The (j+2)th turn of the second wire 60 is located on the outside between the (i+1)th turn and the (i+2)th turn of the first wire 50. The (j+3)th turn of the second wire 60 is located on the outside between the (i+2)th turn and the (i+3)th turn of the first wire 50. The (j+4)th turn of the second wire 60 is located on the outside between the (i+3)th turn and the (i+4)th turn of the first wire 50.

[0090] In the Fig. In the modification example shown in 6, the j-th turn and the (j+1)-th turn of the second wire do not need to be wound around the outside between adjacent turns of the wire of the first layer L1. For example, in the example shown in Fig. In the modification example shown in Figure 7, before the (j+1)th turn, the jth turn of the second wire 60 has the first crossing point CR1, where the jth turn of the second wire 60 crosses the ith turn of the first wire on the outside of the ith turn of the first wire. Furthermore, the portion of the jth turn of the second wire 60 that is closer to the second wire end 62 than the first crossing point CR1 has the second crossing point CR2, where the jth turn of the second wire 60 crosses the (j-1)th turn of the second wire 60 outside of the (j-1)th turn of the second wire 60. Then, a portion of the (j+1)th turn of the second wire 60 is wound directly around the core section 11 between the ith turn of the first wire 50 and the jth turn of the second wire 60.Furthermore, the other part of the (j+1)th turn of the second wire 60 is wound directly around the winding core section 11 between the j-th turn of the second wire 60 and the (i+1)th turn of the first wire 50. The configuration of the (j-1)th turn and the turns before the (j-1)th turn of the second wire 60, as well as the (j+2)th turn and the turns after the (j+2)th turn of the second wire 60, corresponds to that of the one in . Fig. 6 shown modification example. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2018-120885 [0002, 0003]

Claims

[1] Coil assembly, comprising: a winding core section with a columnar shape; a first flange section which is provided at a first end of the winding core section in a direction along a central axis of the winding core section; a second flange section provided at a second end of the winding core section opposite the first end; a first external electrode and a second external electrode provided on the first flange section; a third external electrode and a fourth external electrode provided on the second flange section; a first wire wound around the winding core section, the first wire having a first wire end and a second wire end, the first wire end of the first wire being connected to the first outer electrode, and the second wire end of the first wire being connected to the third outer electrode; and a second wire wound around the core section in the same direction as the first wire, the second wire having a first wire end and a second wire end, the first wire end of the second wire being connected to the second outer electrode, the second wire end of the second wire being connected to the fourth outer electrode, wherein Each time the first wire is wound around the central axis in the direction from the first wire end to the second wire end and forms a turn, the number of turns of the first wire is increased by one, and If each time the second wire is wound around the central axis in the direction from the first wire end to the second wire end and forms a turn, the number of turns of the second wire is increased by one, has a j-th turn (j is a positive integer of 2 or more) of the second wire: a first intersection point where the j-th turn of the second wire crosses the i-th turn of the first wire outside an i-th turn (i is a positive integer of 2 or more) of the first wire, and a second crossing point where the j-th turn of the second wire crosses the (j-1)-th turn of the second wire outside a (j-1)-th turn of the second wire. [2] Coil component according to claim 1, wherein a (j+1)th turn of the second wire is a last turn of the second wire. [3] Coil component according to claim 1 or 2, wherein the winding core section has a polygonal prism shape and if one of the side faces of the winding core section is a specified side face, a first turn and a part that is closer to the first wire end than the first turn of the second wire, do not contain a part that crosses the first wire on the specified side face. [4] Coil component according to one of claims 1 to 3, wherein the winding core section has a polygonal prism shape, and If one of the side surfaces of the winding core section is a specific side surface, then the first intersection point and the second intersection point lie on the specific side surface. [5] Coil component according to one of claims 1 to 4, wherein the second wire, when traced from the first crossing point to the second crossing point in a direction from a first wire end to a second wire end, extends from a second flange section to a first flange section.

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