Coil parts

Abstract

A coil component and a method for manufacturing the same are provided, which can improve the reliability of connection of a wire to an electrode. [Solution] The wire (21) contains copper, and the terminal electrode (23) as an electrode includes a tin-plated layer (42) at least on its surface. In a cutting process in which tension is applied to the wire (21) to cut and remove an excess portion of the end (21a) of the wire (21) near the edge of the terminal electrode (23), the excess portion of the end (21a) of the wire (21) is cut and removed, and the end (21a) of the wire (21) is divided into a first portion (43) and a second portion (44) adjacent to each other in the longitudinal direction. In a thermocompression bonding process in which the end (21a) of the wire (21) is thermocompression bonded to the terminal electrode (23), the first portion (43) and the second portion (44) are joined to the terminal electrode (23) via an alloy layer (41) of tin and copper, and the alloy that constitutes the alloy layer (41) is introduced between the first portion (43) and the second portion (44).

Description

[Technical Field]

[0001] The present disclosure relates to a coil component comprising a core having a winding core portion around which a wire is wound and flange portions provided at each end of the winding core portion in the axial direction, and electrodes provided at the flange portions and connected to wires, and in particular to the structure of the connection portion between the wire and the electrodes. [Background technology]

[0002] For example, Japanese Patent Laid-Open No. 2013-191694 (Patent Document 1) describes a coil component that includes a core having a winding core around which a wire is wound and flanges provided at each end of the winding core. Figure 5 is an excerpt from Patent Document 1 and corresponds to Figure 7(b) in Patent Document 1.

[0003] As shown in Fig. 5, coil device 51 includes a core 54 having a winding core 52 and flanges 53 provided at each end of winding core 52 in the axial direction. Fig. 5 illustrates a portion of coil device 51. In coil device 51, flanges located symmetrically to flange 53 are not illustrated. A wire 55 is wound around winding core 52, and an end of wire 55 is connected to an electrode 56 provided on flange 53 by thermocompression bonding. More specifically, wire 55 contains copper and electrode 56 contains tin at least on its surface. Therefore, as a result of thermocompression bonding, an alloy of tin and copper is produced, and wire 55 and electrode 56 are joined via an alloy layer derived from the alloy.

[0004] As shown in Fig. 5, in the structure described in Patent Document 1, a step is provided on the bottom surface 57 of the flange portion 53, and a step shape is imparted to the bottom surface 58 of the electrode 56 so as to follow this step. Therefore, when the wire 55 is thermocompression-bonded to the bottom surface 58 of the electrode 56, the wire 55 is not subjected to the compression force at the lower portion of the bottom surface 58 of the electrode 56. As a result, the region where the alloy layer is formed is limited, and it is possible to prevent the end of the wire 55 from being thermocompression-bonded. Patent Document 1 states that this makes it easy to cut off the excess portion of the end of the wire 55. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-191694 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the structure described in Patent Document 1, an alloy layer that contributes to bonding is only formed in a limited area of ​​the bottom surface 58 of the electrode 56 and at the contact point between the wire 55 and the electrode 56, which raises concerns that the connection reliability of the wire 55 may be poor.

[0007] Therefore, an object of the present disclosure is to provide a coil component and a manufacturing method thereof that can improve the reliability of connection of a wire to an electrode. [Means for solving the problem]

[0008] The present disclosure is first directed to a coil component comprising a core having a winding core portion and flange portions provided at each axial end of the winding core portion, a wire wound around the winding core portion, and an electrode provided at the flange portion and connected to the wire.

[0009] The wire contains copper, and the electrode contains tin at least on its surface, and at the connection portion between the wire and the electrode, the wire and the electrode are joined to each other via an alloy of tin and copper.

[0010] In order to solve the above-mentioned technical problems, the present disclosure is characterized in that, in at least one connection portion, the end of the wire is divided into a first portion and a second portion adjacent to each other in the longitudinal direction, and the above-mentioned alloy is interposed between the first portion and the second portion.

[0011] The present disclosure is also directed to a method for manufacturing a coil component. The coil component to be manufactured includes 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 an electrode provided on the flange and connected to the wire, the wire containing copper and the electrode containing tin at least on its surface. At the connection portion between the wire and the electrode, the wire and the electrode are joined to each other via a tin-copper alloy.

[0012] The method for manufacturing a coil component according to the present disclosure comprises the steps of: arranging a wire along an electrode; thermocompression bonding the end of the wire to the electrode; and cutting the excess portion of the end of the wire near the edge of the electrode by applying tension to the wire while the wire is arranged along the electrode, wherein the cutting step includes cutting and removing the excess portion of the end of the wire and dividing the end of the wire into a first portion and a second portion adjacent in the longitudinal direction; and the thermocompression bonding step includes thermocompression bonding the first portion and the second portion of the end of the wire to the electrode, thereby joining the first portion and the second portion to the electrode via an alloy of tin and copper, and introducing the alloy between the first portion and the second portion of the end of the wire. [Effects of the Invention]

[0013] According to the present disclosure, an alloy layer is formed at the contact point between the electrode and the wire, and this alloy layer acts to reduce the ductility of the copper contained in the wire, making the wire less likely to break, and since the alloy is also present between the first and second portions of the end of the wire, a thicker alloy layer is formed between the first and second portions of the end of the wire. The thicker alloy layer contributes to improving the connection strength of the wire to the electrode, thereby improving the connection reliability of the wire to the electrode. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing the appearance of a coil component 1 according to an embodiment of the present disclosure, with bottom surfaces 7 and 8 facing upward. [Figure 2] 2 is a cross-sectional view taken along the length of the wire 21, showing an enlarged schematic view of the connection portion between the first end 21a of the first wire 21 and the wire connection piece 34 of the first terminal electrode 23 shown in FIG. [Figure 3] This figure is for explaining that the dividing position between the first portion 43 and the second portion 44 of the wire 21 is on the ridge line 45, and shows the terminal electrode 23 shown in Figure 2 alone, with the ridge line 45 and the first and second surfaces 46 and 47 shown. [Figure 4] 10 is a cross-sectional view schematically showing a step of connecting a wire 21 to a terminal electrode 23. FIG. [Figure 5] FIG. 1 is a diagram illustrating the background art and corresponds to FIG. 7(b) in Patent Document 1. DETAILED DESCRIPTION OF THE INVENTION

[0015] A coil device 1 according to an embodiment of the present disclosure will be described with reference to FIGS.

[0016] As shown in Fig. 1, the coil device 1 includes a winding core 2 and a drum-shaped core 5 having 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 metal magnetic powder. In the drawing, the winding core 2 has a substantially rectangular cross-sectional shape, but it may also be a polygonal shape such as a hexagon, a circle, an ellipse, or a combination of these.

[0017] The first flange portion 3 has a bottom surface 7 that faces the mounting board during mounting, a top surface 9 that faces the opposite side of the bottom surface 7, and connects the bottom surface 7 and the top surface 9.The first flange portion 3 has an inner end surface 11 that faces the winding core portion 2 and positions the end of the winding core portion 2 in the axial direction AX, an outer end surface 13 that faces 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 to each other.

[0018] Similarly, the second flange portion 4 has a bottom surface 8 that faces the mounting board during mounting, a top surface 10 that faces the opposite side of the bottom surface 8, an inner end surface 12 that connects the bottom surface 8 and the top surface 10 and faces the winding core portion 2 and positions the end of the winding core portion 2 in the axial direction AX, an outer end surface 14 that faces 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 to each other.

[0019] As an example, the core 5 has a dimension of 3.5 mm in the axial direction AX, a dimension of 2.6 mm in the width direction WD in which the first side surfaces 15 and 16 face the second side surfaces 17 and 18, and a dimension of 1.4 mm in the height direction HD in which the bottom surfaces 7 and 8 face the top surfaces 9 and 10.

[0020] The coil component 1 is provided with a top plate 19 that connects the top surface 9 of the first flange 3 of the core 5 and the top surface 10 of the second flange 4. The top plate 19 is bonded to the core 5 with an adhesive. The top plate 19 can be made of ferrite, a non-conductive material other than ferrite, or a resin containing ferrite powder or metallic magnetic powder. Instead of the top plate 19, a resin coating may be applied. Note that the top plate 19 or the resin coating may not be provided.

[0021] Coil component 1 constitutes, for example, a common mode choke coil and includes first wire 21 and second wire 22 wound around winding core 2 of core 5. As is well known, in a common mode choke coil, first wire 21 and second wire 22 are wound in the same direction around winding core 2. Wires 21 and 22 include a central wire made of a highly conductive metal containing copper, such as copper or a copper alloy, and an insulating coating covering the central wire made of an electrically insulating resin, such as polyamideimide, polyurethane, or polyesterimide. Wires 21 and 22 preferably have a diameter of 20 μm or more and 60 μm or less.

[0022] The first flange 3 has a first terminal electrode 23 and a third terminal electrode 25 spaced apart from each other and arranged side by side in the width direction WD, while the second flange 4 has a second terminal electrode 24 and a fourth terminal electrode 26 spaced apart from each other and arranged side by side in the width direction WD. The terminal electrodes 23 to 26 are made of, for example, a metal plate whose body is made of copper and whose outward facing surface is plated with nickel and then tin. Therefore, the terminal electrodes 23 to 26 contain tin at least on their surfaces. The terminal electrodes 23 to 26 are fixed to the flange 3 or 4 via an adhesive.

[0023] First end 21a and second end 21b of first wire 21, which are opposite to each other, are connected by thermocompression to first terminal electrode 23 and second terminal electrode 24, which serve as electrodes. First end 22a and second end 22b of second wire 22, which are opposite to each other, are connected by thermocompression to third terminal electrode 25 and fourth terminal electrode 26, which serve as electrodes, respectively. The connections between these wires 21 and 22 and terminal electrodes 23 to 26 will be described in detail below.

[0024] The bottom surfaces 7 and 8 of the first flange 3 and the second flange 4 are provided with raised portions 27 and 28, respectively, that rise up in the center in the width direction WD. Shoulders 29 and 30 that are lower than the raised portion 27 are formed on both sides of the raised portion 27 in the width direction. Shoulders 31 and 32 that are lower than the raised portion 28 are formed on both sides of the raised portion 28 in the width direction.

[0025] The first terminal electrode 23 has a portion that extends in an S-shape along the raised portion 27 and shoulder portion 29 on the bottom surface 7 of the first flange 3. Similarly, the second terminal electrode 24 has a portion that extends in an S-shape along the raised portion 28 and shoulder portion 31 on the bottom surface 8 of the second flange 4, the third terminal electrode 25 has a portion that extends in an S-shape along the raised portion 27 and shoulder portion 30 on the bottom surface 7 of the first flange 3, and the fourth terminal electrode 26 has a portion that extends in an S-shape along the raised portion 28 and shoulder portion 32 on the bottom surface 8 of the second flange 4.

[0026] In the first terminal electrode 23, a mounting connection piece 33, which serves as the connection point with the mounting board (not shown), is provided by a portion extending along the raised portion 27, and a wire connection piece 37, which serves as the connection point with the first end 21a of the first wire 21, is provided by a portion extending along the shoulder portion 29.

[0027] Similarly, in the second terminal electrode 24, the mounting connection piece 34, which serves as the connection point with the mounting board, is provided by a portion extending along the raised portion 28, and the wire connection piece 38, which serves as the connection point with the second end 21b of the first wire 21, is provided by a portion extending along the shoulder portion 31.

[0028] In addition, in the third terminal electrode 25, a mounting connection piece 35, which serves as the connection point with the mounting board, is provided by a portion extending along the raised portion 27, and a wire connection piece 39, which serves as the connection point with the first end 22a of the second wire 22, is provided by a portion extending along the shoulder portion 30.

[0029] In addition, in the fourth terminal electrode 26, a mounting connection piece 36, which serves as the connection point with the mounting board, is provided by a portion extending along the raised portion 28, and a wire connection piece 40, which serves as the connection point with the second end 22b of the second wire 22, is provided by a portion extending along the shoulder portion 32.

[0030] Next, a preferred configuration of the connection portions between the wires 21 and 22 and the terminal electrodes 23 to 26 will be described. Fig. 2 shows an enlarged cross-sectional view cut along the length of the wire 21, illustrating the connection portion between the first end 21a of the first wire 21 and the wire connection piece 37 of the first terminal electrode 23 shown in Fig. 1, as a representative of the multiple connection portions between the wires 21 and 22 and the terminal electrodes 23 to 26. Note that Fig. 2 is a schematic illustration, and the cross-sectional shape of the wire 21, for example, does not necessarily reflect the actual situation.

[0031] 2 shows a part of the wire connection piece 37 of the first terminal electrode 23 arranged along the bottom surface 7 of the first flange 3, and the first end 21a of the first wire 21. Fig. 2 shows the state after the wire 21 has been connected to the terminal electrode 23 by thermocompression bonding, i.e., the state in which the wire 21 and the terminal electrode 23 are joined to each other via an alloy layer 41 made of an alloy of copper derived from the copper contained in the wire 21 and tin derived from the tin contained at least on the surface of the terminal electrode 23. Fig. 2 also shows a tin plating layer 42 that is the source of the tin contained in the alloy layer 41.

[0032] As a characteristic configuration of the present disclosure, at the connection portion between the wire 21 and the terminal electrode 23, the end 21a of the wire 21 is divided into a first portion 43 and a second portion 44 adjacent to each other in the longitudinal direction, and an alloy constituting the alloy layer 41 is interposed between the first portion 43 and the second portion 44 together with a tin plating layer 42 that is partially melted during the thermocompression bonding process. When the alloy is interposed between the first portion 43 and the second portion 44 of the end 21a of the wire 21, a thicker alloy layer 41 is formed between the first portion 43 and the second portion 44 of the end 21a of the wire 21. This contributes to improving the connection strength of the wire 21 to the terminal electrode 23, thereby improving the connection reliability of the wire 21 to the terminal electrode 23. In this embodiment, the first portion 43 is located closer to the tip of the wire 21 than the second portion 44 and extends to the vicinity of the edge of the terminal electrode 23.

[0033] 3 shows the terminal electrode 23 shown in FIG. 2 alone, and illustrates a ridge line 45, a first surface 46, and a second surface 47. The terminal electrode 23 forms a first surface 46 and a second surface 47 in the wire connecting piece 37, which intersect with each other at an angle θ greater than 180 degrees, with the ridge line 45 extending in a direction intersecting the extension direction of the wire 21 as a boundary. The first surface 46 extends parallel to the axial direction AX, and the second surface 47 is inclined in a direction approaching the winding core portion 2 with increasing distance from the first surface 46.

[0034] 2, the dividing position between the first portion 43 and the second portion 44 of the wire 21 is located on the ridge line 45. Explaining this with reference to FIG. 3, when perpendicular lines PL1 and PL2 are drawn from the first surface 46 and the second surface 47, respectively, and passing through the position of the ridge line 45, and at least a part of the dividing portion between the first portion 43 and the second portion 44 exists within the range R sandwiched between these perpendicular lines PL1 and PL2, the dividing position can be defined as being located on the ridge line 45.

[0035] In order to obtain the state shown in Fig. 2, the process shown in Fig. 4 is preferably carried out. Fig. 4 shows the connection portion between the wire 21 and the terminal electrode 23. Note that Fig. 4 is also a schematic illustration, similar to Fig. 2.

[0036] First, as shown in FIG. 4(1), the wire 21 is placed along the terminal electrode 23.

[0037] Next, in the above-mentioned state, while applying tension T to the wire 21, the heater tip 48 is lowered toward the terminal electrode 23 and brought into contact with the wire 21 as shown in FIG. 4(2), thereby performing a thermocompression bonding process, in which the end 21a of the wire 21 is thermocompression bonded to the terminal electrode 23. As a result, the insulating coating (not shown) of the wire 21 is thermally decomposed, and at the contact portion between the wire 21 and the terminal electrode 23, the copper contained in the wire 21 and the tin present at least on the surface of the terminal electrode 23 are alloyed to form an alloy layer 41 (see FIG. 2). The alloy layer 41 realizes a strong bond between the wire 21 and the terminal electrode 23.

[0038] Furthermore, as shown in Figure 4 (3), with the wire 21 positioned along the terminal electrode 23, tension T is applied to the wire 21 as described above, so that a cutting process is carried out in which the excess 49 at the end 21a of the wire 21 is cut and removed near the edge of the terminal electrode 23.

[0039] Typically, the cutting process shown in FIG. 4(3) is designed to be performed after the thermocompression bonding process shown in FIG. 4(2). More precisely, the cutting process begins after the thermocompression bonding process begins. However, there may be a slight timing discrepancy between the thermocompression bonding process and the cutting process. For example, the cutting process may begin before the alloy layer 21 is fully formed during the thermocompression bonding process. In this case, the tension T applied to the wire 21 during the cutting process may cause the end 21a of the wire 21 to be split into a first portion 43 and a second portion 44 adjacent to each other in the longitudinal direction, as shown in FIG. 4(3). The aforementioned FIG. 2 shows the end 21a of the wire 21 split into a first portion 43 and a second portion 44 adjacent to each other in the longitudinal direction.

[0040] Since the above-mentioned separation that occurs in the wire 21 is caused by the wire being torn into the first portion 43 and the second portion 44, each of the separated portions of the first portion 43 and the second portion 44 may be relatively tapered, but in Figure 4(3) this is shown in an extremely simplified manner.

[0041] As described above, the dividing position between the first portion 43 and the second portion 44 is located on the ridge line 45. This is because, when the wire 21 is subjected to tension T on the terminal electrode 23, stress is concentrated at the ridge line 45, making it prone to dividing on the ridge line 45. This makes it easy to control the dividing position at the end 21a of the wire 21 to be approximately constant.

[0042] 2, a tin plating layer 42 that is partially melted during the thermocompression bonding process is interposed between the first portion 43 and the second portion 44, and alloy layers 41 are introduced between the tin plating layer 42 and each of the first portion 43 and the second portion 44. The introduction of the alloy layers 41 contributes to improving the connection reliability of the wire 21 to the terminal electrode 23, because the end portion 21a of the wire 21 is divided into the first portion 43 and the second portion 44 before the thermocompression bonding process is completed.

[0043] In the above description, each of the first portion 43 and the second portion 44 is positioned as part of the end 21a of the wire 21, but in reality, the first portion 42 located on the tip side of the wire 21 is separated from the wire 21 and may not be considered part of the end of the wire 21. However, since the first portion 42 originally originates from the end 21a of the wire 21, in this specification, the first portion 43, like the second portion 44, will also be expressed as part of the end of the wire 21.

[0044] In addition, although FIG. 2 illustrates the inclined second surface 47 of the terminal electrode 23 as consisting of a single plane, the second surface 47 may, for example, be at least partially curved, or may consist of two or more planes.

[0045] Furthermore, if the advantage of easily controlling the dividing position at the end 21a of the wire 21 to be approximately constant is not particularly desired, the terminal electrode 23 may form a uniform surface without forming a ridge line.

[0046] Above, with reference to Figures 2 to 4, the characteristic configuration of the first end 21a of the first wire 21 has been described, in which the end 21a of the wire 21 is divided into a first portion 43 and a second portion 44 adjacent to each other in the longitudinal direction, and an alloy constituting the alloy layer 41 is also present between the first portion 43 and the second portion 44. However, such a configuration may be provided only in the first end 21a of the first wire 21, or 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 first wire 22, and the second end 22b of the second wire 22.

[0047] 1 , in the coil device 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 are arranged to extend along the width direction WD. Therefore, in the wire connection piece 37 of the first terminal electrode 23 and the wire connection piece 40 of the fourth terminal electrode 26, the first surface 46 extending parallel to the axial direction AX and the inclined second surface 47 are aligned in the axial direction AX, while in the wire connection piece 38 of the second terminal electrode 24 and the wire connection piece 39 of the third terminal electrode 25, the first surface extending parallel to the axial direction AX and the inclined second surface are aligned in the width direction WD. As shown in FIG. 1, even in this case, the first surface extends parallel to the axial direction AX, and the second surface is inclined in a direction approaching the winding core 2 with increasing distance from the first surface.

[0048] Although the present disclosure has been described with reference to the illustrated embodiments, various other embodiments are possible within the scope of the present disclosure.

[0049] For example, instead of metal plates, terminal electrodes 23 to 26 may be coated electrodes made of conductive films formed on flanges 3 and 4. In this case, for example, base electrodes are formed on bottom surfaces 7 and 8 of flanges 3 and 4 by baking silver paste, and base electrodes are formed on outer end surfaces 13 and 14 of flanges 3 and 4 by vapor deposition of silver, and these base electrodes are plated with copper, nickel, and tin in this order.

[0050] The coil components to which the present disclosure is directed may be those constituting a common mode choke coil as in the illustrated embodiment, as well as those constituting a single coil, or those constituting a transformer, balun, etc. Therefore, the number of wires may be changed depending on the function of the coil component, and the number of terminal electrodes provided on each flange portion may also be changed accordingly.

[0051] Furthermore, when configuring a coil component according to the present disclosure, partial substitution or combination of configurations is possible between the different embodiments described in this specification.

[0052] The present disclosure includes the following embodiments.

[0053] <1> a core having a winding core portion and flange portions provided at each end of the winding core portion in the axial direction; a wire wound around the winding core; an electrode provided on the flange and connected to the wire; Equipped with the wire comprises copper; the electrode comprises tin at least on a surface thereof; At a connection portion between the wire and the electrode, the wire and the electrode are joined to each other via an alloy of tin and copper, In at least one of the connection portions, the end of the wire is divided into a first portion and a second portion adjacent to each other in the longitudinal direction, and the alloy is interposed between the first portion and the second portion. Coil parts.

[0054] <2> The electrode forms a first surface and a second surface that intersect with each other at an angle exceeding 180 degrees with a ridge line extending in a direction intersecting with the extending direction of the wire, and the dividing position between the first portion and the second portion of the wire is located on the ridge line. <1> The coil component according to claim 1.

[0055] <3> The first surface extends parallel to the axial direction, and the second surface is inclined in a direction approaching the winding core portion as it moves away from the first surface. <2> The coil component according to claim 1.

[0056] <4> The first portion is located closer to the tip of the wire than the second portion and extends to the vicinity of an edge of the electrode. <1> Or <3> The coil component according to any one of the preceding claims.

[0057] <5> The electrode is a terminal electrode made of a metal plate. <1> Or <4> The coil component according to any one of the preceding claims.

[0058] <6> The electrode is a coated electrode made of a conductor film. <1> Or <4> The coil component according to any one of the preceding claims.

[0059] <7> a core having a winding core portion and flange portions provided at each end of the winding core portion in the axial direction; a wire wound around the winding core; an electrode provided on the flange and connected to the wire; Equipped with the wire comprises copper; the electrode comprises tin at least on a surface thereof; At a connection portion between the wire and the electrode, the wire and the electrode are joined to each other via an alloy of tin and copper. A method for manufacturing a coil component, comprising: placing the wire along the electrode; a thermocompression bonding step of thermocompressing the end of the wire to the electrode; a cutting step of applying tension to the wire while the wire is disposed along the electrode, thereby cutting and removing excess wire at the end of the wire at the edge of the electrode; Equipped with the cutting step includes a step of cutting and removing an excess portion of the end of the wire and dividing the end of the wire into a first portion and a second portion adjacent to each other in a longitudinal direction, the thermocompression bonding step includes a step of thermocompression bonding the first and second portions of the end of the wire to the electrode, thereby joining the first and second portions and the electrode to each other via an alloy of tin and copper, and introducing the alloy between the first and second portions of the end of the wire. Manufacturing method of coil parts. [Explanation of symbols]

[0060] 1 Coil parts 2 Winding core 3,4 Tsuba section 5 cores 21,22 Wire 21a, 21b, 22a, 22b Wire ends 23~26 terminal electrode 41 Alloy layer 42 Tin plating layer 43 Part 1 44 Part 2 45 Ridgeline 46 Page 1 47 Side 2 48 heater tip 49 extra AX Axial direction WD Width direction HD Height direction θ angle PL1,PL2 perpendicular lines R Range T tension

Claims

1. a core having a winding core portion and flange portions provided at each end of the winding core portion in the axial direction; a wire wound around the winding core; an electrode provided on the flange and connected to the wire; Equipped with the wire comprises copper; the electrode comprises tin at least on a surface thereof; At a connection portion between the wire and the electrode, the wire and the electrode are joined to each other via an alloy of tin and copper, In at least one of the connection portions, the end of the wire is divided into a first portion and a second portion adjacent to each other in the longitudinal direction, and the alloy is interposed between the first portion and the second portion. Coil parts.

2. 2. The coil component according to claim 1, wherein the electrode forms a first surface and a second surface that intersect with each other at an angle of more than 180 degrees, with a ridge line extending in a direction intersecting the extension direction of the wire, and the dividing position between the first portion and the second portion of the wire is located on the ridge line.

3. The coil component according to claim 2 , wherein the first surface extends parallel to the axial direction, and the second surface is inclined in a direction approaching the winding core portion with increasing distance from the first surface.

4. The coil component according to claim 1 , wherein the first portion is located closer to the tip of the wire than the second portion and extends to a vicinity of an edge of the electrode.

5. The coil component according to claim 1 , wherein the electrodes are terminal electrodes made of metal plates.

6. The coil component according to claim 1 , wherein the electrode is a coated electrode made of a conductive film.

7. a core having a winding core portion and flange portions provided at each end of the winding core portion in the axial direction; a wire wound around the winding core; an electrode provided on the flange and connected to the wire; Equipped with the wire comprises copper; the electrode comprises tin at least on a surface thereof; At a connection portion between the wire and the electrode, the wire and the electrode are joined to each other via an alloy of tin and copper. A method for manufacturing a coil component, comprising: placing the wire along the electrode; a thermocompression bonding step of thermocompressing the end of the wire to the electrode; a cutting step of applying tension to the wire while the wire is disposed along the electrode, thereby cutting and removing excess wire at the end of the wire at the edge of the electrode; Equipped with the cutting step includes a step of cutting off an excess portion of the end of the wire and dividing the end of the wire into a first portion and a second portion adjacent to each other in a longitudinal direction, the thermocompression bonding step includes a step of thermocompression bonding the first and second portions of the end of the wire to the electrode, thereby joining the first and second portions and the electrode to each other via an alloy of tin and copper, and introducing the alloy between the first and second portions of the end of the wire. Manufacturing method of coil parts.

Images