Coil components

Abstract

The present invention provides a coil component that is less prone to wire breakage and improves the reliability of the wire connection to the terminal electrode. [Solution] A metal plating film 44 is formed on the wire arrangement surface 43 of the terminal electrode 25. The metal plating film 44 includes an underlying nickel layer and a surface tin layer. At the connection portion between the wire 21 and the wire arrangement surface 43, the wire 21 extends along the wire arrangement surface 43, and a bonding material 45 derived from the metal plating film 44, for example containing tin, joins the wire 21 and the wire arrangement surface 43. At the end of the wire arrangement surface 43 where the portion of the wire 21 extending toward the winding core is positioned, a fillet 46 derived from the metal plating film 44, for example containing tin, is formed to fill the gap between the wire arrangement surface 43 and the wire 21.

Description

Technical Field

[0001] The present disclosure relates to a coil component including a core having a bobbin portion around which a wire is wound and flange portions provided at both end portions in the axial direction of the bobbin portion, and terminal electrodes provided on the flange portions to which the wire is connected. In particular, it relates to the structure of the connection portion between the wire and the terminal electrodes.

Background Art

[0002] For example, Japanese Unexamined Patent Application Publication No. 2013-191694 (Patent Document 1) describes a coil component including a core having a bobbin portion around which a wire is wound and flange portions provided at both end portions of the bobbin portion. FIG. 3 is cited from Patent Document 1 and corresponds to FIG. 7(b) in Patent Document 1.

[0003] As shown in FIG. 3, the coil component 61 includes a core 64 having a bobbin portion 62 around which a wire 65 is wound and flange portions 63 provided at both end portions in the axial direction of the bobbin portion 62. In FIG. 3, only a part of the coil component 61 is shown. In the coil component 61, the flange portions symmetric to the illustrated flange portion 63 are not shown. A wire 65 is wound around the bobbin portion 62, and the end portion of the wire 65 is connected to a terminal electrode 66 provided on the flange portion 63 by thermocompression bonding. More specifically, since the wire 65 contains copper and the terminal electrode 66 contains tin at least on the surface, an alloy of tin and copper is generated as a result of thermocompression bonding, and the wire 65 and the terminal electrode 66 are joined through an alloy layer derived from the alloy.

[0004] In the structure described in Patent Document 1, a step is provided on the bottom surface 67 of the flange portion 63, and a stepped shape is provided on the bottom surface 68 of the terminal electrode 66 to follow this step. Therefore, when the wire 65 is heat-pressed to the bottom surface 68 of the terminal electrode 66, the lower part of the bottom surface 68 of the terminal electrode 66 is prevented from receiving the pressing force. As a result, the area in which the alloy layer is formed is limited, and heat-pressing up to the end of the wire 65 can be avoided. According to Patent Document 1, this makes it easy to cut and remove the excess at the end of the wire 65. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2013-191694 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, in the structure described in Patent Document 1, although not clearly shown in Figure 3, the portion of the wire 65 that contacts the bottom surface 68 of the terminal electrode 66 may be thinned by the pressure from the heater tip for thermocompression bonding, which could result in a decrease in the strength of the wire 65.

[0007] Furthermore, in this case, the portion that contacts the bottom surface 68 of the terminal electrode 66 becomes flattened in cross-section, while the portion that extends away from the bottom surface 68 of the terminal electrode 66 towards the winding core 62 maintains its original circular cross-section. In other words, the cross-sectional shape of the wire 65 changes between the portion that contacts the bottom surface 68 of the terminal electrode 66 and the portion that extends away from the bottom surface 68 towards the winding core 62, and it is presumed that the cross-sectional shape of the wire 65 changes abruptly, particularly near the end edge 69 on the winding core 62 side of the bottom surface 68 of the terminal electrode 66.

[0008] When the wire 65 is pulled due to some external factor, stress tends to concentrate at the point where the cross-sectional shape of the wire 65 changes abruptly, making it prone to breakage at that point.

[0009] It is also conceivable to reduce the working area of ​​the heater tip for heat compression bonding to suppress the rapid change in the cross-sectional shape of the wire 65 as described above. However, in that case, there is a concern that the area for heat compression bonding will be insufficient, and the reliability of the connection between the wire 65 and the terminal electrode 66 will be reduced.

[0010] Therefore, the purpose of this disclosure is to provide a coil component that makes wire breakage less likely as described above, and improves the reliability of the connection of the wire to the terminal electrode. [Means for solving the problem]

[0011] This disclosure relates to a coil component comprising a core having a winding core and flanges provided at each end of the winding core in the axial direction, a wire wound around the winding core, and terminal electrodes made of metal plates provided on the flanges and connected to the wire drawn out from the winding core.

[0012] The flange portion has a bottom surface facing the mounting substrate and a top surface facing the opposite side of the bottom surface, and the terminal electrodes are provided on the bottom surface side of the flange portion.

[0013] The terminal electrode has a wire arrangement surface on which wires are placed, and a metal plating film is formed on the wire arrangement surface.

[0014] At the connection point between the wire and the wire arrangement surface, the wire extends along the wire arrangement surface, and a bonding material containing metal derived from the metal plating film joins the wire to the terminal electrode.

[0015] To solve the technical problems described above, this disclosure is characterized in that, in at least one of the above-mentioned connection portions, a fillet containing metal derived from a metal plating film is formed at the end of the wire arrangement surface that positions the portion of the wire extending toward the winding core side, so as to fill the gap between the wire arrangement surface and the wire. [Effects of the Invention]

[0016] In this disclosure, a bonding material containing metal derived from a metal plating film is used to bond a wire extending along a wire arrangement surface to the wire arrangement surface. At this time, a fillet is formed at the end of the wire arrangement surface to fill the gap between the wire arrangement surface and the wire, thereby achieving bonding between the wire and the terminal electrode. Bonding by such a fillet contributes to improving the reliability of the connection of the wire to the terminal electrode.

[0017] Furthermore, focusing on the position of the fillet, it is located in a position where the load from the heat-sealing process is not substantially applied to the wire. In other words, during the heat-sealing process, the heater tip can be prevented from reaching the ends of the wire on the wire placement surface. Therefore, even if the wire is pulled by some external factor, the strength of the wire is maintained by the fillet, making it less likely for the wire to break.

[0018] Furthermore, the cross-sectional shape of the wire may change between the portion in contact with the wire arrangement surface and the portion extending away from the wire arrangement surface toward the winding core. This can easily cause wire breakage at the end of the wire arrangement surface of the terminal electrode. However, according to this disclosure, a fillet is formed at the end of the wire arrangement surface, which reinforces the wire and makes wire breakage less likely. [Brief explanation of the drawing]

[0019] [Figure 1] This is a perspective view showing the appearance of a coil component 1 according to one embodiment of the present disclosure, with the bottom surfaces 7 and 8 facing upward. [Figure 2]It is a cross-sectional view taken along the length direction of the wire 21, schematically showing an enlarged connection portion between the first end portion 21a of the first wire 21 shown in FIG. 1 and the wire connection piece 39 of the first terminal electrode 25. [Figure 3] It is for explaining the background art and is a figure corresponding to FIG. 7(b) in Patent Document 1.

Embodiments for Carrying Out the Invention

[0020] Referring to FIGS. 1 and 2, the coil component 1 according to an embodiment of the present disclosure will be described.

[0021] As shown in FIG. 1, the coil component 1 includes a drum-shaped core 5 having a winding core portion 2 and a first flange portion 3 and a second flange portion 4 provided at opposite ends in the axial direction AX of the winding core portion 2, respectively. The core 5 is composed of, for example, ferrite, a non-conductive material other than ferrite, a resin containing ferrite powder or metal magnetic powder, etc. The winding core portion 2 has a substantially rectangular cross-sectional shape in the drawing, but may also have a polygonal shape such as a hexagonal shape, a circular shape, an elliptical shape, or a combination of these shapes.

[0022] The first flange portion 3 has a bottom surface 7 directed toward the mounting substrate side during mounting, a top surface 9 directed to the opposite side of the bottom surface 7, and connects the bottom surface 7 and the top surface 9. It has an inner end surface 11 facing the winding core portion 2 side and positioning the end portion in the axial direction AX of the winding core portion 2, an outer end surface 13 facing the opposite side of the inner end surface 11, and a first side surface 15 and a second side surface 17 that connect the inner end surface 11 and the outer end surface 13 and face in opposite directions.

[0023] Similarly, the second flange portion 4 has a bottom surface 8 directed toward the mounting substrate side during mounting, a top surface 10 directed to the opposite side of the bottom surface 8, and connects the bottom surface 8 and the top surface 10. It has an inner end surface 12 facing the winding core portion 2 side and positioning the end portion in the axial direction AX of the winding core portion 2, an outer end surface 14 facing the opposite side of the inner end surface 12, and a first side surface 16 and a second side surface 18 that connect the inner end surface 12 and the outer end surface 14 and face in opposite directions.

[0024] Core 5, as an example, has dimensions of 3.5 mm in the axial direction AX, 2.6 mm in the width direction WD (where the first sides 15 and 16 and the second sides 17 and 18 face each other), and 1.4 mm in the height direction HD (where the bottom surfaces 7 and 8 and the top surfaces 9 and 10 face each other).

[0025] A top plate 19 may be provided on the coil component 1 so as to connect the top surface 9 of the first flange portion 3 and the top surface 10 of the second flange portion 4 of the core 5. The top plate 19 is joined to the core 5 by adhesive. As the material for the top plate 19, 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 19, a resin coating may be applied. Note that the top plate 19 may be omitted, and the resin coating may also be omitted.

[0026] The coil component 1, for example, constitutes a common mode choke coil and comprises a first wire 21 and a second wire 22 wound around the core portion 2 of the core 5. In a common mode choke coil, as is well known, the first wire 21 and the second wire 22 are wound in the same direction around the core portion 2. The wires 21 and 22, as shown for wire 21 in Figure 2, comprise a central wire 23 made of a highly conductive metal containing copper, such as copper or tough pitch copper, and an insulating coating 24 made of an electrically insulating resin such as polyamide-imide, polyurethane, or polyester-imide covering the central wire 23. The insulating coating 24 is shown by a thick line in Figure 2. The wires 21 and 22 are not particularly limited, but for example, they may have a diameter of 15 μm or more and 140 μm or less. The cross-sectional shape of the wires 21 and 22 is preferably circular or substantially circular.

[0027] On the bottom surface 7 side of the first flange portion 3, a first terminal electrode 25 and a third terminal electrode 27 are provided spaced apart from each other and aligned in the width direction WD, and on the bottom surface 8 side of the second flange portion 4, a second terminal electrode 26 and a fourth terminal electrode 28 are provided spaced apart from each other and aligned in the width direction WD. The terminal electrodes 25 to 28 are fixed to the flange portion 3 or 4 via adhesive.

[0028] The opposite first ends 21a and 21b of the first wire 21 are connected to the first terminal electrode 23 and the second terminal electrode 24, respectively, by thermocompression bonding. The opposite first ends 22a and 22b of the second wire 22 are connected to the third terminal electrode 25 and the fourth terminal electrode 26, respectively, by thermocompression bonding. Details of the connections between these wires 21 and 22 and the terminal electrodes 23 to 26 will be described later.

[0029] The bottom surfaces 7 and 8 of the first flange portion 3 and the second flange portion 4 are provided with raised portions 29 and 30, respectively, that rise in the center of the width direction WD. Shoulder portions 31 and 32, which are lower than the raised portion 29, are formed on both sides of the raised portion 29 in the width direction. Shoulder portions 33 and 34, which are lower than the raised portion 30, are formed on both sides of the raised portion 30 in the width direction.

[0030] The first terminal electrode 25 has a portion that curves and extends in an S-shape along the raised portion 29 and shoulder portion 31 on the bottom surface 7 of the first flange portion 3. Similarly, the second terminal electrode 26 has a portion that curves and extends in an S-shape along the raised portion 30 and shoulder portion 33 on the bottom surface 8 of the second flange portion 4, the third terminal electrode 27 has a portion that curves and extends in an S-shape along the raised portion 30 and shoulder portion 32 on the bottom surface 7 of the first flange portion 3, and the fourth terminal electrode 28 has a portion that curves and extends in an S-shape along the raised portion 30 and shoulder portion 34 on the bottom surface 8 of the second flange portion 4.

[0031] In the first terminal electrode 25, a mounting connection piece 35, which is the connection point with the mounting substrate (not shown), is provided by a portion extending along the raised portion 29, and a wire connection piece 39, which is the connection point with the first end portion 21a of the first wire 21, is provided by a portion extending along the shoulder portion 31.

[0032] Similarly, in the second terminal electrode 26, the mounting connection piece 36, which is the connection point with the mounting substrate, is provided by a portion extending along the raised portion 30, and the wire connection piece 40, which is the connection point with the second end 21b of the first wire 21, is provided by a portion extending along the shoulder portion 33.

[0033] Furthermore, in the third terminal electrode 27, the mounting connection piece 37, which is the connection point with the mounting substrate, is provided by a portion extending along the raised portion 29, and the wire connection piece 41, which is the connection point with the first end 22a of the second wire 22, is provided by a portion extending along the shoulder portion 32.

[0034] Furthermore, in the fourth terminal electrode 28, the mounting connection piece 38, which is the connection point with the mounting substrate, is provided by a portion extending along the raised portion 30, and the wire connection piece 42, which is the connection point with the second end 22b of the second wire 22, is provided by a portion extending along the shoulder portion 34.

[0035] Next, a preferred configuration for the connection portion between wires 21 and 22 and terminal electrodes 25-28 will be described. Figure 2 shows a cross-sectional view cut along the length of wire 21, representing multiple connection portions between wires 21 and 22 and terminal electrodes 25-28, and showing an enlarged view of the connection portion between the first end 21a of the first wire 21 and the wire connecting piece 39 of the first terminal electrode 25, as shown in Figure 1.

[0036] The terminal electrode 25 is made of a metal plate, for example, whose base material is a copper-containing metal such as phosphor bronze, and which has a metal plating film 44 formed on its outward-facing surface.

[0037] In Figure 2, the wire connecting piece 39 of the first terminal electrode 25 and the first end 21a of the first wire 21 are shown, arranged along the bottom surface 7 of the first flange portion 3. There may be a gap between the wire connecting piece 39 and the bottom surface 7. The wire connecting piece 39 has a wire placement surface 43 on which the wire 21 is to be placed. The aforementioned metal plating film 44 is formed on the wire placement surface 43, but since Figure 2 shows the state after the wire 21 has been connected to the wire placement surface 43 by thermocompression bonding, the metal plating film 44 shown in Figure 2 does not maintain the state before thermocompression bonding. That is, in Figure 2, a bonding material 45 containing metal derived from the metal plating film 44 is shown. Here, the metal plating film 44 and the bonding material 45 cannot be clearly distinguished in the drawing.

[0038] The metal plating film 44 preferably includes an underlying nickel layer and a surface tin layer. When the wire 21 is connected to the wire placement surface 43 by thermocompression bonding, an alloy is formed between the metal constituting the metal plating film 44 and the metal constituting the wire 21. This alloy solidifies from a molten state to become the joining material 44. As mentioned above, the wire 21 contains copper, so the alloy constituting the joining material 45 includes a Sn-Cu alloy or a Sn-Cu-Ni alloy. This joining material 45 achieves a strong bond between the wire 21 and the wire placement surface 43.

[0039] A characteristic feature of this disclosure is that, at the connection portion between the wire 21 and the terminal electrode 25, a fillet 46 containing metal derived from the metal plating film 44 is formed at the end of the wire placement surface 43, which positions the portion of the wire 21 extending toward the winding core portion 2 (see Figure 1), so as to fill the gap between the wire placement surface 43 and the wire 21.

[0040] Further features of the embodiment shown in Figure 2 will be described below.

[0041] The wire arrangement surface 43 comprises, in order from the tip side of the wire 21 toward the core 2 side, a reference surface 47 extending parallel or nearly parallel to the axial direction AX of the core 2, a first inclined surface 48 that slopes toward the top surface 9 of the flange 3 (see Figure 1) as it moves away from the reference surface 47, and a second inclined surface 49 that slopes more strongly than the first inclined surface 48 toward the top surface 9 of the flange 3 as it moves away from the first inclined surface 48. The fillet 46 is formed to fill at least the gap between the second inclined surface 49 and the wire 21. The formation of these inclined surfaces 48 and 49, particularly the second inclined surface 49, makes it easier to form the fillet 46. Furthermore, the first inclined surface 48 ensures the thickness of the wire 21 at the crimped portion 50 of the wire 21. The first inclined surface 48 and the second inclined surface 49 may be planar or curved.

[0042] The wire 21, in the portion extending along the wire arrangement surface 43, includes a crimped portion 50 that is flattened by heat sealing and the other uncrimped portion 51, in order from the tip side toward the winding core portion 2, and the uncrimped portion 51 includes a first uncrimped portion 52 and a second uncrimped portion 53, in order from the tip side toward the winding core portion 2 of the wire 21.

[0043] The insulating coating 24 on the wire 21 is intermittently present at the crimped portion 50, but is absent at least on the wire arrangement surface 43 side of the wire 21. Furthermore, at the first non-crimped portion 52, the insulating coating 24 is continuously present along the longitudinal direction of the wire 21, except for the area where the fillet 46 is formed. At the second non-crimped portion 53, the insulating coating 24 is continuously present along the longitudinal direction and around the entire circumference of the wire 21.

[0044] In the longitudinal direction of the wire 21, the area onto which the second inclined surface 49 is projected is included in the area onto which the first uncrimped portion 52 is projected. With this configuration, the wire 21 at the location where the fillet 46 is formed on the second inclined surface 49 is not subjected to damage due to heat crimping, and the tensile strength of the wire 21 can be maintained at a high level.

[0045] Furthermore, in the longitudinal direction of the wire 21, the area onto which the second inclined surface 49 is projected is on the crimped portion 50 side from the point onto which the boundary between the first non-crimped portion 52 and the second non-crimped portion 53 is projected. With this configuration, the end of the fillet 46 that contacts the wire 21 can be positioned beyond the wire arrangement surface 43 towards the winding core portion 2 side. That is, the joint surface between the wire 21 and the fillet 46 extends toward the winding core portion 2 side beyond the end of the wire arrangement surface 43. Therefore, the joint area between the wire 21 and the wire arrangement surface 43 can be extended toward the winding core portion 2 side beyond the end of the wire arrangement surface 43, thereby increasing the joint strength.

[0046] When viewed in cross-section along a plane extending in the direction in which the wire 21 extends and perpendicular to the wire arrangement surface 43, the fillet 46 has a concave surface on the surface 54 exposed to the external space. This configuration allows the area in contact with the wire 21 to be increased, thereby enabling the reinforcement effect of the fillet 46 on the wire 21 to be exerted more effectively.

[0047] The preferred configuration for the connection portion between the wire and the terminal electrode has been described above, specifically for the connection portion between the first end 21a of the first wire 21 and the wire connecting piece 39 of the first terminal electrode 25. However, such a configuration may be provided only at the first end 21a of the first wire 21, or it may be provided in addition to the first end 21a of the first wire 21 at at least one of the second end 21b of the first wire 21, the first end 22a of the second wire 22, and the second end 22b of the second wire 22.

[0048] Although not an essential feature of this disclosure, in coil component 1, as shown in Figure 1, the first end 21a of the first wire 21 and the second end 22b of the second wire 22 extend along the axial direction AX, while the second end 21b of the first wire 21 and the first end 22a of the second wire 22 extend along the width direction WD. Therefore, the reference surface 47, the first inclined surface 48, and the second inclined surface 49 on the wire arrangement surface 43 are aligned in the axial direction AX for wire connecting pieces 39 and 42, but in the width direction WD for wire connecting pieces 40 and 41.

[0049] Although the above description relates to the illustrated embodiments of this disclosure, various other embodiments are possible within the scope of this disclosure.

[0050] For example, the coil components to which this disclosure is directed may not only constitute a common mode choke coil as shown in the illustrated embodiment, but may also constitute a single coil, a transformer, a balun, and the like. Accordingly, the number of wires may also be changed according to the function of the coil component, and the number of terminal electrodes provided on each flange may also be changed accordingly.

[0051] Furthermore, in constructing the coil component relating to this disclosure, partial substitution or combination of configurations is possible between the different embodiments described in this specification.

[0052] This disclosure includes the following embodiments:

[0053] <1> A core having a winding core and flanges provided at each end of the winding core in the axial direction, The wire wound around the aforementioned core, A terminal electrode made of a metal plate is provided on the flange portion, and the wire drawn out from the winding core portion is connected to it, Equipped with, The flange portion has a bottom surface facing the mounting substrate side and a top surface facing the opposite side of the bottom surface. The terminal electrode is provided on the bottom surface side of the flange portion, has a wire arrangement surface on which the wire is arranged, and a metal plating film is formed on the wire arrangement surface. At the connection portion between the wire and the wire arrangement surface, the wire extends along the wire arrangement surface, and a bonding material containing metal derived from the metal plating film bonds the wire and the wire arrangement surface. At least one of the connection portions, at the end of the wire arrangement surface that positions the portion of the wire extending toward the winding core, a fillet containing metal derived from the metal plating film is formed to fill the gap between the wire arrangement surface and the wire. Coil components.

[0054] <2> The wire, in the portion extending along the wire arrangement surface, includes, in order from the tip side toward the winding core side, a crimped portion that is flattened by heat compression and an uncrimped portion with a circular or substantially circular cross-section. The non-crimped portion includes, in order from the tip side toward the core side, a first non-crimped portion and a second non-crimped portion. The wire, in the portion wound around the core, has a circular or substantially circular cross-section. The wire has an insulating coating, The insulating coating is In the crimped portion, it is present intermittently, but not present on the wire at least on the wire arrangement surface side. In the first non-crimped portion, except for the portion where the fillet is formed, it is continuously present along the longitudinal direction of the wire. In the second non-crimped portion, the wire is continuously present in the longitudinal direction and around its entire circumference. <1> The coil components described above.

[0055] <3> The fillet includes an alloy of the metal constituting the metal plating film and the metal constituting the wire. <1> or <2> The coil components described above.

[0056] <4> The aforementioned wire contains copper, The metal plating film comprises a nickel base layer and a tin surface layer, and the alloy comprises a Sn-Cu alloy or a Sn-Cu-Ni alloy. <3> The coil components described above.

[0057] <5> The wire arrangement surface comprises, in order from the tip side of the wire toward the winding core side, a reference surface extending parallel or substantially parallel to the axial direction of the winding core; a first inclined surface that slopes toward the top surface of the flange as it moves away from the reference surface; and a second inclined surface that slopes more strongly than the first inclined surface toward the top surface of the flange as it moves away from the first inclined surface, wherein the fillet is formed to fill at least the gap between the second inclined surface and the wire. <1> or <4> A coil component as described in any of the following.

[0058] <6> The wire, in the portion extending along the wire arrangement surface, includes, in order from the tip side toward the winding core side, a crimped portion that is flattened by heat compression and an uncrimped portion with a circular or substantially circular cross-section. The non-crimped portion includes, in order from the tip side toward the core side, a first non-crimped portion and a second non-crimped portion. The wire, in the portion wound around the core, has a circular or substantially circular cross-section. The wire has an insulating coating, The insulating coating is In the crimped portion, it is present intermittently, but not present on the wire at least on the wire arrangement surface side. In the first non-crimped portion, except for the portion where the fillet is formed, it is continuously present along the longitudinal direction of the wire. In the second non-crimped portion, the wire is continuously present in the longitudinal direction and around its entire circumference. <5> The coil components described above.

[0059] <7> In the longitudinal direction of the wire on the wire arrangement surface, the area onto which the second inclined surface is projected is located on the crimped side of the point onto which the boundary between the first non-crimped portion and the second non-crimped portion is projected. <6> The coil components described above.

[0060] <8> In the longitudinal direction of the wire on the wire arrangement surface, the area onto which the second inclined surface is projected is included in the area onto which the first non-crimped portion is projected. <6> The coil components described above.

[0061] <9> In the longitudinal direction of the wire on the wire arrangement surface, the area onto which the second inclined surface is projected is located on the crimped side of the point onto which the boundary between the first non-crimped portion and the second non-crimped portion is projected. <8> The coil components described above. <10> When viewed in cross-section along a plane extending in the longitudinal direction of the wire and perpendicular to the wire arrangement plane, the fillet has a concave surface on the surface exposed to the external space. <1> or <9> A coil component as described in any of the following. [Explanation of Symbols]

[0062] 1. Coil component 2. Core section 3,4 Guard section 5 cores 7,8 Bottom 9,10 Top surface 21,22 wires 21a, 21b, 22a, 22b Wire ends 23 Center wire rod 24 Insulating coating 25~28 terminal electrode 39-42 Wire connectors 43 Wire arrangement surface 44 Metal Plating Film 45 Bonding material 46 fillets 47 Reference plane 48 1st slope 49 Second slope 50 Crimping section 51 Non-crimped section 52 First non-crimped section 53 Second non-crimped section 54 Surface AX Axial direction

Claims

1. A core having a winding core and flanges provided at each end of the winding core in the axial direction, The wire wound around the aforementioned core, A terminal electrode made of a metal plate is provided on the flange portion, and the wire drawn out from the winding core portion is connected to it, Equipped with, The flange portion has a bottom surface facing the mounting substrate side and a top surface facing the opposite side of the bottom surface. The terminal electrode is provided on the bottom surface side of the flange portion, has a wire arrangement surface on which the wire is arranged, and a metal plating film is formed on the wire arrangement surface. At the connection portion between the wire and the wire arrangement surface, the wire extends along the wire arrangement surface, and a bonding material containing metal derived from the metal plating film bonds the wire and the wire arrangement surface. At least one of the connection portions, at the end of the wire arrangement surface that positions the portion of the wire extending toward the winding core, a fillet containing metal derived from the metal plating film is formed to fill the gap between the wire arrangement surface and the wire. Coil components.

2. The wire, in the portion extending along the wire arrangement surface, includes, in order from the tip side toward the winding core side, a crimped portion that is flattened by heat compression and an uncrimped portion with a circular or substantially circular cross-section. The non-crimped portion includes, in order from the tip side toward the core side, a first non-crimped portion and a second non-crimped portion. The wire, in the portion wound around the core, has a circular or substantially circular cross-section. The wire has an insulating coating, The insulating coating is In the crimped portion, it is present intermittently, but not present on the wire at least on the wire arrangement surface side. In the first non-crimped portion, except for the portion where the fillet is formed, it is continuously present along the longitudinal direction of the wire. In the second non-crimped portion, the wire is continuously present in the longitudinal direction and around its entire circumference. The coil component according to claim 1.

3. The coil component according to claim 1, wherein the fillet includes an alloy of the metal constituting the metal plating film and the metal constituting the wire.

4. The aforementioned wire contains copper, The coil component according to claim 3, wherein the metal plating film comprises a nickel layer as an underlayment and a tin layer on the surface, and the alloy comprises a Sn-Cu alloy or a Sn-Cu-Ni alloy.

5. The wire arrangement surface comprises, in order from the tip side of the wire toward the winding core side, a reference surface extending parallel or substantially parallel to the axial direction of the winding core; a first inclined surface that slopes toward the top surface of the flange as it moves away from the reference surface; and a second inclined surface that slopes more strongly than the first inclined surface toward the top surface of the flange as it moves away from the first inclined surface, wherein the fillet is formed to fill at least the gap between the second inclined surface and the wire, as described in claim 1.

6. The wire, in the portion extending along the wire arrangement surface, includes, in order from the tip side toward the winding core side, a crimped portion that is flattened by heat compression and an uncrimped portion with a circular or substantially circular cross-section. The non-crimped portion includes, in order from the tip side toward the core side, a first non-crimped portion and a second non-crimped portion. The wire, in the portion wound around the core, has a circular or substantially circular cross-section. The wire has an insulating coating, The insulating coating is In the crimped portion, it is present intermittently, but not present on the wire at least on the wire arrangement surface side. In the first non-crimped portion, except for the portion where the fillet is formed, it is continuously present along the longitudinal direction of the wire. In the second non-crimped portion, the wire is continuously present in the longitudinal direction and around its entire circumference. The coil component according to claim 5.

7. The coil component according to claim 6, wherein, in the longitudinal direction of the wire on the wire arrangement surface, the area onto which the second inclined surface is projected is located on the crimped side of the point onto which the boundary between the first non-crimped portion and the second non-crimped portion is projected.

8. The coil component according to claim 6, wherein, in the longitudinal direction of the wire on the wire arrangement surface, the area onto which the second inclined surface is projected is included in the area onto which the first non-crimped portion is projected.

9. The coil component according to claim 8, wherein, in the longitudinal direction of the wire on the wire arrangement surface, the area onto which the second inclined surface is projected is located on the crimped side of the point onto which the boundary between the first non-crimped portion and the second non-crimped portion is projected.

10. The coil component according to any one of claims 1 to 9, wherein, when viewed in a cross-section along a plane extending in the longitudinal direction of the wire and perpendicular to the wire arrangement plane, the fillet has a concave surface on the surface exposed to the external space.

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