Coil component

Abstract

Provided is a coil component in which wire disconnection is less likely to occur in a part at which a wire is joined to a terminal electrode, the wire being led out from a winding core part in an oblique direction relative to the axial line direction while crossing the winding core part when viewed from the mounting surface side.　A terminal electrode (19) is provided with: a mounting part (26) that is connected to a mounting board; a joint part (28) that provides a joining surface (27) to which an end portion (15a) of a wire (15) is joined at a position lower than the mounting part; and a connection part (29) that connects the mounting part and the joint part. The connection part is provided with: a vertical relay portion (30) that is contiguous with the mounting part and that extends along a step portion; and a horizontal relay portion (31) that is contiguous with the vertical relay portion and that continues toward the joint part (28). The end portion (15a) of the wire (15) is guided so as to at least partially overlap with the horizontal relay portion when viewed in a direction perpendicular to the joining surface (27) while joined to neither the vertical relay portion nor the horizontal relay portion, and is connected to the joint part.

Description

Coil component

[0001] The present disclosure relates to a coil component including a core having a winding part around which a wire is wound and flange parts provided at both end parts in the axial direction of the winding part, and terminal electrodes provided on the flange parts to which the wire is connected, and particularly relates to the structure of the connection part of the wire to the terminal electrodes.

[0002] For example, Japanese Patent Application Laid-Open No. 2013-191694 (Patent Document 1) describes a coil component including a core having a winding part around which a wire is wound and flange parts provided at both end parts of the winding part. FIG. 6 is cited from Patent Document 1 and corresponds to FIG. 7(b) in Patent Document 1.

[0003] As shown in FIG. 6, the coil component 101 includes a core 104 having a winding part 102 around which a wire 105 is wound and flange parts 103 provided at both end parts in the axial direction of the winding part 102. In FIG. 6, a part of the coil component 101 is shown. In the coil component 101, the flange parts symmetric to the illustrated flange part 103 are not shown. The wire 105 is wound around the winding part 102, and the end part of the wire 105 is joined (crimped) to a terminal electrode 106 provided on the flange part 103.

[0004] As shown in FIG. 6, in the structure described in Patent Document 1, a step is provided on the mounting surface 107 of the flange part 103, and a step shape is imparted to the mounting part 108 of the terminal electrode 106 along this step. Therefore, when the wire 105 is joined to the mounting part 108 of the terminal electrode 106, the wire 105 can be prevented from receiving a joining action (crimping action) at the lower part of the mounting part 108 of the terminal electrode 106. As a result, the joining region is restricted, and it is possible to avoid joining up to the terminal part of the wire 105. According to Patent Document 1, it is described that this makes it easy to cut and remove the excess of the end part of the wire 105.

[0005] Japanese Patent Application Laid-Open No. 2013-191694

[0006] However, in the structure described in Patent Document 1, the joint area between the wire 105 and the terminal electrode 106 extends to the edge 109 or its vicinity of the mounting portion 108 of the terminal electrode 106. Therefore, when the coil component 101 is assembled or mounted, if it encounters any contact or collision from the outside, such as foreign matter like solder balls or jigs and tools used during circuit board assembly, the wire 105 tends to break or snap near the edge 109.

[0007] Therefore, the purpose of this disclosure is to provide a coil component that is less prone to wire breakage at the connection portion to the terminal electrode.

[0008] The coil component according to this disclosure comprises a core having a winding core portion extending in the axial direction and flange portions provided at opposite ends of the winding core portion in the axial direction, at least one wire wound around the winding core portion, and terminal electrodes made of metal plates provided at the flange portions to which the wire is connected.

[0009] The flange portion has a mounting surface that faces the mounting substrate side during mounting, a top surface that faces the opposite side of the mounting surface, an inner end surface that connects the mounting surface and the top surface and faces the winding core side and is located at the axial end of the winding core, an outer end surface that faces the opposite side of the inner end surface, and a first side surface and a second side surface that connect the inner end surface and the outer end surface and face in opposite directions to each other.

[0010] The mounting surface is provided with a higher section and a lower section located below the higher section via a stepped section.

[0011] The wire has a first end that is drawn out from the core while crossing the core when viewed from the mounting side. The terminal electrode includes a first terminal electrode to which the first end of the wire is connected.

[0012] To solve the technical problems described above, the coil component according to this disclosure includes a first terminal electrode comprising: a mounting portion extending along a high portion and connected to a mounting substrate; a joining portion extending along a low portion and providing a joining surface to which the first end of the wire is joined; and a connecting portion connecting the mounting portion and the joining portion. The connecting portion comprises a vertical relay portion extending from the mounting portion along a stepped portion, and a horizontal relay portion extending from the vertical relay portion along a low portion and connected to the joining portion. The first end of the wire is guided so that at least a portion overlaps the horizontal relay portion when viewed from a direction perpendicular to the joining surface, without being joined to either the vertical relay portion or the horizontal relay portion, and is joined to the joining portion.

[0013] According to this disclosure, the first end of the wire is guided so that at least a portion of it overlaps the lateral relay section when viewed from a direction perpendicular to the joint surface, without being joined to the joint section, and is then joined to the joint section. Here, the lateral relay section connected to the joint section extends along the lower part, just like the joint section. Therefore, there are no edges at the joint section that could cause wire breakage. Furthermore, the wire joined to the joint section is supported by the lateral relay section acting as a support. As a result, wire breakage is less likely to occur.

[0014] Furthermore, since the first end of the wire is not joined to either the longitudinal or transverse relay section, it is not substantially constrained by either the longitudinal or transverse relay section. Therefore, the wire is less prone to bending. This also contributes to reducing the likelihood of wire breakage.

[0015] Figure 3 is a perspective view showing the appearance of a coil component 1 according to one embodiment of the present disclosure, with the mounting surface 7 side of the flanges 3 and 4 facing upward. Figure 4 is a perspective view showing the terminal electrode 19 shown in Figure 1 enlarged and alone. Figure 5 is a view of the terminal electrode 19 shown in Figure 2 from a direction perpendicular to the joining surface 27. Figure 6 is a view of the terminal electrode 19 shown in Figure 2 with the mounting piece 36 facing forward. Figure 7 is a diagram for explaining the arrangement of the end 15a of the wire 15 in the terminal electrode 19 shown in Figure 3. This diagram is for explaining the background art and corresponds to Figure 7(b) in Patent Document 1.

[0016] A coil component 1 according to one embodiment of the present disclosure will be described with reference to Figures 1 to 5.

[0017] As shown in Figure 1, the coil component 1 comprises a drum-shaped core 5 having a winding core 2 and a first flange 3 and a second flange 4 provided at opposite ends of the winding core 2 in the axial direction AX. The core 5 is made of, for example, ferrite, or a resin containing ferrite powder or metallic magnetic powder. In the figure, the cross-sectional shape of the winding core 2 is approximately square, but it may also be a polygon such as a hexagon, a circle, an ellipse, or a combination thereof.

[0018] Each of the first flange portion 3 and the second flange portion 4 has a mounting surface 7 that faces the mounting substrate side during mounting, a top surface 8 that faces the opposite side of the mounting surface 7, an inner end surface 9 that connects the mounting surface 7 and the top surface 8 and faces the winding core portion 2 and is located at the end of the winding core portion 2 in the axial direction AX, an outer end surface 10 that faces the opposite side of the inner end surface 9, and a first side surface 11 and a second side surface 12 that connect the inner end surface 9 and the outer end surface 10 and face in opposite directions to each other.

[0019] As an example, core 5 has dimensions of 3.5 mm in the axial direction AX, 2.6 mm in the width direction WD (the direction in which the first side surface 11 and the second side surface 12 face each other), and 1.4 mm in the height direction HD (the direction in which the mounting surface 7 and the top surface 8 face each other).

[0020] A top plate 13 may be provided on the coil component 1 so as to connect the top surfaces 8 of the first flange portion 3 and the second flange portion 4 of the core 5. The top plate 13 is fixed to the core 5 with adhesive. As the material for the top plate 13, ferrite, a non-conductive material other than ferrite, or a resin containing ferrite powder or metallic magnetic powder can be used. Instead of the top plate 13, a resin coating may be applied. Note that the top plate 13 may be omitted, and the resin coating may also be omitted.

[0021] The coil component 1, for example, constitutes a common mode choke coil and includes a first wire 15 and a second wire 16 wound around the core portion 2 of the core 5. In a common mode choke coil, as is well known, the first wire 15 and the second wire 16 are wound in the same direction around the core portion 2. The wires 15 and 16 each consist of a core wire made of a highly conductive metal containing copper, such as copper or a copper alloy, and an insulating coating made of an electrically insulating resin such as polyamide-imide, polyurethane, or polyester-imide covering the core wire. It is preferable to use wires 15 and 16 with a diameter of 20 μm or more and 60 μm or less.

[0022] Two terminal electrodes 19 and 22 are provided on the first flange portion 3, spaced apart from each other and aligned in the width direction WD, and two terminal electrodes 20 and 21 are provided on the second flange portion 4, spaced apart from each other and aligned in the width direction WD. The terminal electrodes 19 to 22 are made of metal plates, for example, with a base body made of phosphor bronze and its outward-facing surface plated with nickel and then tin in that order. The base material of the terminal electrodes 19 to 22 is not particularly limited as long as it is a conductive metal. The terminal electrodes 19 to 22 are fixed to the flange portion 3 or 4 via adhesive.

[0023] The opposite ends 15a and 15b of the first wire 15 are connected to terminal electrodes 19 and 20, respectively, by thermocompression bonding. The opposite ends 16a and 16b of the second wire 16 are connected to terminal electrodes 21 and 22, respectively, by thermocompression bonding. In addition to thermocompression bonding, various connection methods such as laser welding, soldering, or bonding with conductive adhesive may be used. Details of the connection between these wires 15 and 16 and terminal electrodes 19 to 22 will be described later.

[0024] Each mounting surface 7 of the first flange portion 3 and the second flange portion 4 is provided with a raised portion 23, and a lower portion 25 is provided that is lower than the raised portion 23 via a stepped portion 24. In this embodiment, the raised portion 23 is provided so as to rise in the center of the width direction WD of each mounting surface 7 of the first flange portion 3 and the second flange portion 4, and the lower portion 25 is provided on both sides of the width direction WD of the raised portion 23.

[0025] Each of the terminal electrodes 19 to 22 has a portion that curves in an S-shape along the high portion 23 and low portion 25 on the respective mounting surfaces 7 of the flange portions 3 and 4. Here, terminal electrodes 19 and 21 have the same shape, and terminal electrodes 20 and 22 have the same shape.

[0026] Of these terminal electrodes 19 to 22, the first ends 15a and 16a of the wires 15 and 16 connected to terminal electrodes 19 and 21 are drawn out from the winding core 2 while crossing the winding core 2 when viewed from the mounting surface 7 side. The first ends 15a and 16a of the wires 15 and 16 connected to terminal electrodes 19 and 21 may be oblique or perpendicular to the axial direction AX in the portion that overlaps with the winding core 2 when viewed from the mounting surface 7 side. As shown in Figure 1, in the coil component 1 of one embodiment of this disclosure, the first ends 15a and 16a are oblique to the axial direction AX in the portion that overlaps with the winding core 2 when viewed from the mounting surface 7 side. In particular, these terminal electrodes 19 and 21 have a shape that is characteristic of this disclosure. Therefore, the details of the terminal electrode 19 will be described below with reference to Figures 2 to 5. As mentioned above, terminal electrodes 19 and 21 have the same shape, so the explanation regarding terminal electrode 21 will be omitted by referring to the explanation regarding terminal electrode 19.

[0027] In the terminal electrode 19, a mounting portion 26, which is the connection point with the mounting substrate (not shown), is provided by a portion extending along the high portion 23, and a joining portion 28, which provides a joining surface 27 with the first end 15a of the first wire 15, is provided by a portion extending along the low portion 25. The mounting portion 26 and the joining portion 28 are connected by a connecting portion 29. The connecting portion 29 includes a vertical relay portion 30 that extends from the mounting portion 26 along the stepped portion 24, and a horizontal relay portion 31 that extends from the vertical relay portion 30 along the low portion 25 and connects to the joining portion 28.

[0028] Preferably, the joint surface 27 provided by the aforementioned joint 28 has an inclined surface 32 that becomes lower towards the lateral relay portion 31, at least on the side of the lateral relay portion 31. This is because the contact of the joint surface 27 with the wire 15 becomes softer, making it less likely to damage the wire 15.

[0029] Furthermore, the entire joint surface 27 may be an inclined surface 32 that becomes lower towards the lateral relay portion 31. Moreover, the thickness of the joint portion 28 may be approximately the same as the thickness of the lateral relay portion 31, and the joint surface 27 may not have an inclined surface 32 and may be approximately flush with the surface formed by the lateral relay portion 31. In addition, even if the joint surface 27 does not have an inclined surface 32 and the thickness of the lateral relay portion 31 is different, if the boundary portion between the joint surface 27 and the lateral relay portion 31 is chamfered and does not have an edge, damage to the wire 15 can be made less likely.

[0030] Furthermore, if the joint surface 27 has an inclined surface 32, "direction perpendicular to the joint surface" means the direction perpendicular to the surface with the largest area among the surfaces of the joint surface 27.

[0031] The vertical relay portion 30 has a relatively thick portion 30a and a relatively thin portion 30b, and the relatively thin portion 30b is connected to the horizontal relay portion 31. With this configuration, bending deformation between the vertical relay portion 30 and the horizontal relay portion 31 can be easily performed in the plastic deformation process to obtain the terminal electrode 19. The vertical relay portion 30 does not necessarily have to extend in a straight line, as long as it extends substantially along the stepped portion 24.

[0032] The first end 15a of the wire 15 is shown in Figures 2 and 5. Figure 2 is a perspective view of the terminal electrode 19 in the position shown in Figure 1, and Figure 5 shows the terminal electrode 19 and the first end 15a of the wire 15 from a direction perpendicular to the joint surface 27. Here, the first end 15a of the wire 15 is shown by a dotted line in Figure 2 and by a thick solid or dashed line in Figure 5.

[0033] More specifically, Figure 5 shows the first end 15a of the wire 15 in three states: (A), (B), and (C). The thick solid lines in (A) and (B) indicate states that satisfy the condition that the first end 15a is guided so that at least a portion of it overlaps the lateral relay portion 31 when viewed from a direction perpendicular to the joint surface 27, and is joined to the joint portion 28. Furthermore, the illustrated (A) and (B) satisfy a more preferable condition in which the first end 15a of the wire 15 overlaps the lateral relay portion 31 over its entire width when viewed from a direction perpendicular to the joint surface 27. Note that the first end 15a in (A) penetrates the joint surface 27 more deeply than the first end 15a in (B). On the other hand, (C) shows a state that does not satisfy the above condition. In other words, (C) the first end 15a of the wire 15 does not overlap with the lateral relay portion 31 over its entire width when viewed from a direction perpendicular to the joint surface 27.

[0034] As shown in Figure 3, the lateral relay portion 31 has a curved edge portion 33 defined by a curved side edge such that its width becomes narrower from the joint portion 28 toward the vertical relay portion 30, and a straight edge portion 34 defined by a straight side edge such that it extends with a constant width from the curved edge portion 33 toward the boundary with the vertical relay portion 30.

[0035] Furthermore, the lateral relay section 31 is made narrower than the joint section 28 in at least the portion connected to the joint section 28, thereby forming a guide edge 35 that opens to guide the first end 15a of the wire 15 toward the joint section 28. The presence of the guide edge 35 makes it easier to obtain the state described above, in which the first end 15a is guided so that at least a portion of it overlaps the lateral relay section 31 when viewed from a direction perpendicular to the joint surface 27. Specifically, when pulling the first end 15a toward the joint section 28, tension is applied while it is pressed against the guide edge 35, causing the first end 15a to slide along the guide edge 35 and be guided so that at least a portion of it overlaps the lateral relay section 31 when viewed from a direction perpendicular to the joint surface 27.

[0036] In this way, as shown in Figures 2 and 5, the first end 15a of the wire 15 is guided so that at least a portion of it overlaps the lateral relay portion 31 when viewed from a direction perpendicular to the joining surface 27, and is joined to the joining portion 28. At this time, the first end 15a of the wire 15 is positioned along a portion of the lateral relay portion 31, but is not joined to either the vertical relay portion 30 or the lateral relay portion 31. Therefore, the first end 15a of the wire 15 is not substantially constrained by either the vertical relay portion 30 or the lateral relay portion 31. Thus, since the edges of these vertical relay portions 30 and lateral relay portions 31 are far from the joining surface 27, which is the joining area of ​​the wire 15, they are unlikely to become edges that cause the wire 15 to break.

[0037] The terminal electrode 19 is provided with a mounting piece 36 that extends from the mounting portion 26 along the outer end face 10 of the first flange portion 3. Typically, an adhesive is applied between the mounting piece 36 and the outer end face 10 of the first flange portion 3, thereby fixing the terminal electrode 19 to the core 5.

[0038] As described in detail above, the terminal electrode 19 connects to the first end 15a of the first wire 15. As previously mentioned, the first end 15a of the first wire 15 is drawn out from the winding core 2 in a direction oblique to the axial direction AX, while crossing the winding core 2 when viewed from the mounting surface 7 side. Similarly, the first end 16a of the second wire 16 is drawn out from the winding core 2 in a direction oblique to the axial direction AX, while crossing the winding core 2 when viewed from the mounting surface 7 side. Therefore, the terminal electrode 21 that connects to the first end 16a of the second wire 16 has the same shape as the terminal electrode 19.

[0039] On the other hand, the terminal electrodes 20 and 22 connect the second end 15b of the first wire 15 and the second end 16b of the second wire 16, respectively. However, the second end 15b of the first wire 15 and the second end 16b of the second wire 16 are drawn out from the winding core 2 toward the terminal electrodes 20 and 22 without crossing the winding core 2, as is clearly shown in Figure 1 for the first wire 15.

[0040] Therefore, although not an essential feature, since the second end portion 15b of the first wire 15 and the second end portion 16b of the second wire 16 both face the axial direction AX, the joint portions 28 in the terminal electrodes 20 and 22 have a different shape from the joint portions 28 in the terminal electrodes 19 and 21. Regarding the shapes other than the joint portions 28 in the terminal electrodes 20 and 22, they are substantially the same as the shapes other than the joint portions 28 in the terminal electrodes 19 and 21.

[0041] Further, in this embodiment, as can be seen from FIG. 1, on the inner end surface 9 of each of the flange portions 3 and 4, there are provided contact portions 37 that contact the first end portions 15a and 16a of the wires 15 and 16 drawn out from the winding core portion 2 in a direction oblique to the axial direction AX as viewed from the mounting surface 7 side. As shown in FIG. 1, the first end portion 15a of the wire 15 is bent by contacting the contact portion 37. Thus, by contacting the contact portion 37 to such an extent that the first end portion 15a of the wire 15 is bent, the form of the wire 15 wound around the winding core portion 2 is stabilized, and it is possible to make it less susceptible to the influence of fluctuations transmitted from the terminal electrode 19 to the wire 15. Therefore, the electrical characteristics of the coil component 1 can be stabilized.

[0042] As described above, the coil component according to the present disclosure has been described in relation to the illustrated embodiments, but within the scope of the present disclosure, various other embodiments are possible.

[0043] For example, the coil component to which the present disclosure is directed may be, in addition to constituting a common mode choke coil as in the illustrated embodiment, one that constitutes a single coil, one that constitutes a transformer, a balun, or the like. Therefore, the number of wires can also be changed according to the function of the coil component, and accordingly, the number of terminal electrodes provided on each flange portion can also be changed.

[0044] Further, in constructing the coil component according to the present disclosure, partial substitution or combination of configurations is possible among the different embodiments described in this specification.

[0045] The present disclosure has the following embodiments.

[0046] <1> A core having a bobbin portion extending in the axial direction and flange portions provided at opposite ends of the bobbin portion in the axial direction, at least one wire wound around the bobbin portion, and a terminal electrode made of a metal plate provided on the flange portion and connected to the wire. The flange portion has a mounting surface facing the mounting substrate side during mounting, a top surface facing the opposite side of the mounting surface, and a connecting portion connecting the mounting surface and the top surface. The flange portion also has an inner end surface facing the bobbin portion side and located at an end in the axial direction of the bobbin portion, an outer end surface facing the opposite side of the inner end surface, and a first side surface and a second side surface connecting the inner end surface and the outer end surface and facing in opposite directions. The mounting surface is provided with a high portion and a low portion located lower than the high portion via a stepped portion. The wire has a first end portion that is drawn out from the bobbin portion while crossing the bobbin portion as viewed from the mounting surface side. The terminal electrode includes a first terminal electrode to which the first end portion is connected. The first terminal electrode includes a mounting portion extending along the high portion and connected to the mounting substrate, a joining portion extending along the low portion and providing a joining surface to which the first end portion is joined, and a connecting portion connecting the mounting portion and the joining portion. The connecting portion includes a vertical relay portion extending from the mounting portion and along the stepped portion, and a horizontal relay portion extending from the vertical relay portion and along the low portion and leading to the joining portion. The first end portion is guided so that at least a part thereof overlaps the horizontal relay portion as viewed from a direction perpendicular to the joining surface in a state where the first end portion is not joined to either the vertical relay portion or the horizontal relay portion, and is joined to the joining portion. A coil component.

[0047] <2> The coil component according to <1>, wherein the joining surface has an inclined surface that becomes lower as it goes toward the horizontal relay portion, at least on the horizontal relay portion side.

[0048] <3> The coil component according to <1> or <2>, wherein the vertical relay portion has a relatively thick portion and a relatively thin portion, and is continuous with the horizontal relay portion in the relatively thin portion.

[0049] <4> The coil component according to any one of <1> to <3>, wherein the first end of the wire overlaps the lateral relay portion over its entire radial area when viewed from a direction perpendicular to the joining surface.

[0050] <5> The coil component according to any one of <1> to <4>, wherein the lateral relay portion has a curved edge portion defined by a curved side edge such that its width becomes narrower from the joint portion toward the longitudinal relay portion, and a straight edge portion defined by a straight side edge such that it extends with a constant width from the curved edge portion toward the boundary with the longitudinal relay portion.

[0051] <6> The coil component according to <5>, wherein the lateral relay portion is narrower than the joint portion in at least the portion connected to the joint portion, thereby forming an open guide edge that guides the first end of the wire in the direction of leading to the joint portion.

[0052] <7> The coil component according to any one of <1> to <6>, wherein the inner end face of the flange portion is provided with a contact portion that contacts the first end of the wire drawn out from the winding core portion in a direction oblique to the axial direction when viewed from the mounting surface side.

[0053] 1 Coil component 2 Winding core 3,4 Flange 5 Core 7 Mounting surface 9 Inner end face 10 Outer end face 11,12 Sides 15,16 Wire 15a,15b,16a,16b Wire ends 19-22 Terminal electrodes 23 High section 24 Step section 25 Low section 26 Mounting section 27 Joint surface 28 Joint section 29 Connecting section 30 Vertical relay section 30a Thick section 30b Thin section 31 Horizontal relay section 32 Inclined surface 33 Curved edge section 34 Straight edge section 35 Guide edge 36 Mounting piece 37 Contact section AX Axial direction WD Width direction

Claims

1. A core having a winding core portion extending in the axial direction and flange portions provided at opposite ends of the winding core portion in the axial direction; at least one wire wound around the winding core portion; and terminal electrodes made of metal plates provided at the flange portions to which the wire is connected, wherein the flange portion has a mounting surface facing the mounting substrate side when mounted, a top surface facing the opposite side of the mounting surface, an inner end surface connecting the mounting surface and the top surface and facing the winding core portion side and located at the axial end of the winding core portion, an outer end surface facing the opposite side of the inner end surface, and a first side surface and a second side surface connecting the inner end surface and the outer end surface and facing in opposite directions, wherein the mounting surface is provided with a high portion and a low portion located lower than the high portion via a stepped portion. The wire has a first end that is drawn out from the winding core while crossing the winding core when viewed from the mounting surface side, the terminal electrode includes a first terminal electrode to which the first end is connected, the first terminal electrode comprises a mounting portion that extends along the high portion and is connected to the mounting substrate, a joining portion that extends along the low portion and provides a joining surface to which the first end is joined, and a connecting portion that connects the mounting portion and the joining portion, the connecting portion comprises a vertical relay portion that extends from the mounting portion and along the stepped portion, and a horizontal relay portion that extends from the vertical relay portion and along the low portion and is connected to the joining portion, the first end is guided so as to overlap at least a portion of the horizontal relay portion when viewed from a direction perpendicular to the joining surface, without being joined to either the vertical relay portion or the horizontal relay portion, and is joined to the joining portion, a coil component.

2. The coil component according to claim 1, wherein the joining surface has an inclined surface that becomes lower towards the lateral relay portion, at least on the side of the lateral relay portion.

3. The coil component according to claim 1 or 2, wherein the vertical relay portion has a relatively thick portion and a relatively thin portion, and the relatively thin portion is connected to the horizontal relay portion.

4. The coil component according to any one of claims 1 to 3, wherein the first end of the wire overlaps the lateral relay portion over its entire radial length when viewed from a direction perpendicular to the joining surface.

5. The coil component according to any one of claims 1 to 4, wherein the lateral relay portion has a curved edge portion defined by a curved side edge such that its width becomes narrower from the joint portion toward the longitudinal relay portion, and a straight edge portion defined by a straight side edge such that it extends with a constant width from the curved edge portion toward the boundary with the longitudinal relay portion.

6. The coil component according to claim 5, wherein the lateral relay portion is narrower than the joint portion in at least the portion connected to the joint portion, thereby forming an open guide edge that guides the first end of the wire in the direction of leading to the joint portion.

7. The coil component according to any one of claims 1 to 6, wherein the inner end face of the flange portion is provided with a contact portion that contacts the first end of the wire drawn out from the winding core portion in a direction oblique to the axial direction when viewed from the mounting surface side.

Images