Coil component

Abstract

In the provided coil component, a flange portion of a core is provided with a terminal electrode and a groove, and a wire connected to the terminal electrode is accommodated in the groove. In this structure, the degree of freedom of an entry operation in which the wire material enters the groove provided in the flange portion of the core body is increased, and inconsistency in the position of the wire material in the groove is reduced. The mounting surface of the flange part is provided with a groove which is a part for accommodating the end part of the wire rod and extends in a direction connecting the inner end surface and the outer end surface of the flange part. The groove has a bottom surface sandwiched between a first side and a second side extending in a direction connecting the inner end surface and the outer end surface, and the first side is positioned closer to a lead-out position of the wire from the winding core than the second side. The interval between the first side and the second side is narrower on the inner end surface side and wider on the outer end surface side. The angle formed by the first side in the coaxial line direction is smaller than the angle formed by the second side in the coaxial line direction.

Description

Technical Field

[0001] The present invention relates to a winding type coil component, and more particularly to a structure of a connection portion provided in a flange portion of a core body and connected to a wire material. Background Art

[0002] The coil component related to the present invention is described in, for example, Japanese Patent Publication No. 2006-100748 (Patent Document 1). The coil component described in Patent Document 1 comprises: a core body having a winding core portion and a first flange portion and a second flange portion respectively provided at a first end portion and a second end portion thereof located at opposite positions in the axial direction; a first terminal electrode and a second terminal electrode respectively provided at the first flange portion and the second flange portion; and a wire material connected between the first terminal electrode and the second terminal electrode and wound around the winding core portion.

[0003] The first flange portion and the second flange portion each have four peripheral surfaces, and the cross-section is a quadrilateral. A groove is provided on each of the four peripheral surfaces. The groove forms a bottom surface sandwiched by two sides parallel to the axial direction of the winding core portion and two rising surfaces rising from the bottom surface respectively through the above-mentioned two sides. The above-mentioned terminal electrode is provided on any peripheral surface of the flange portion. The end of the wire is connected to the terminal electrode in a state of being received in the groove provided on the peripheral surface.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2006-100748

[0005] In the above-mentioned groove, the two sides defining the bottom surface and the two rising surfaces extend in parallel with the axial direction of the winding core. Therefore, there is a tendency that the lead-out angle of the wire that is led out from the winding core to the groove and connected to the terminal electrode is restricted, and the degree of freedom of the wire entering the groove is relatively low. For example, the wire usually enters the groove obliquely, but at this time, there is a situation where the end of the wire abuts against the rising surface of the groove that is relatively far from the lead-out position of the wire from the winding core, and this situation sometimes restricts the wire from entering the groove.

[0006] Furthermore, in the groove, the two sides defining the bottom surface and the two rising surfaces extend in parallel with the axial direction of the winding core, so there is a tendency for the width of the groove capable of accommodating the wire to become wider, thereby causing greater inconsistency in the position of the wire in the groove. Summary of the invention

[0007] Therefore, an object of the present invention is to provide a coil component having a structure that improves the degree of freedom of entry of a wire into a groove provided in a flange portion of a core body and can reduce inconsistency in the position of the wire in the groove.

[0008] The coil component according to the present invention includes a core having a winding core portion extending in an axial direction, and a first flange portion and a second flange portion provided at first and second ends of the winding core portion located at opposite ends in the axial direction.

[0009] Each of the first flange and the second flange has a mounting surface facing the mounting substrate when mounted, an inner end surface facing the winding core, and an outer end surface opposite to the inner end surface.

[0010] The coil component further includes: a first terminal electrode and a second terminal electrode provided on at least mounting surfaces of the first flange portion and the second flange portion, respectively; and at least one wire connecting between the first terminal electrode and the second terminal electrode and wound around the winding core portion.

[0011] A groove is provided on the mounting surface of at least one of the first flange portion and the second flange portion, the groove being a portion for accommodating an end portion of the wire and extending in a direction connecting the inner end face with the outer end face, the groove being in a state of having an opening formed at least on the inner end face side, and having a bottom surface sandwiched by a first side and a second side respectively extending in a direction connecting the inner end face with the outer end face, and a first rising surface and a second rising surface respectively rising from the bottom surface via the first side and the second side, the first side being located closer to a lead-out position of the wire from the winding core portion than the second side.

[0012] In a coil component having such a structure, in the present invention, in order to solve the aforementioned technical problems, it is characterized in that the interval between the first side and the second side is narrower on the inner end face side and wider on the outer end face side, and the angle formed by the first side in the coaxial direction is smaller than the angle formed by the second side in the coaxial direction.

[0013] According to the present invention, the interval between the first side and the second side that define the shape of the bottom surface of the groove for storing the end of the wire is narrower on the inner end surface side and wider on the outer end surface side, and the angle formed by the first side and the axial direction is smaller than the angle formed by the second side and the axial direction. Therefore, the restriction on the entry of the wire into the groove is reduced, and the inconsistency of the position of the wire in the groove can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view showing the appearance of the coil component 1 according to the first embodiment of the present invention.

[0015] Figure 2 yes Figure 1 The coil component 1 is shown in a bottom view from the mounting surface 7 , 13 side.

[0016] Figure 3 Yes Figure 2The illustrated perspective view is a partially enlarged view of a core 2 included in a coil component 1 and shown from the mounting surface 7 side.

[0017] Figure 4 yes Figure 2 The core 2 of the coil component 1 shown in the figure is partially provided, and is viewed from the mounting surface 7 side. Figure 3 The portion shown is enlarged and shown in a bottom view.

[0018] Figure 5 FIG. 2 is a diagram showing a part of the core 2a provided in the coil component according to the second embodiment of the present invention. Figure 4 .

[0019] Figure 6 FIG. 1 is a diagram showing a part of the core 2b included in the coil component according to the third embodiment of the present invention. Figure 4 .

[0020] Figure 7 FIG. 1 is a diagram showing a part of the core 2c provided in the coil component according to the fourth embodiment of the present invention. Figure 4 .

[0021] Figure 8 FIG. 1 is a diagram showing a part of a core 2d provided in a coil component according to a fifth embodiment of the present invention. Figure 4 .

[0022] Description of Reference Numerals

[0023] 1...coil component; 2, 2a, 2b, 2c, 2d...core body; 3...winding core portion; 5, 6...flange portion; 7, 13...mounting surface; 9, 15...inner end surface; 10, 16...outer end surface; 21, 22...terminal electrode; 23...wire; 25, 26...slot; 27...1st side; 28...2nd side; 29...bottom surface; 31...1st rising surface; 32...2nd rising surface; 33...lead-out position; A...axial direction; D...arrow indicating the lead-out direction; θ1...angle of the first side; θ2...angle of the second side. DETAILED DESCRIPTION

[0024] Reference Figures 1 to 4 , a coil component 1 according to a first embodiment of the present invention will be described.

[0025] like Figure 1 and Figure 2As shown, the coil component 1 has a core 2. Typically, the core 2 is made of ferrite, but the core 2 may also be made of other materials such as a resin containing ferrite powder, alumina powder or metal magnetic powder. The core 2 has: a winding core 3 extending along the axial direction A; and a first flange 5 and a second flange 6 respectively provided at the first end and the second end of the winding core 3 located at opposite positions in the axial direction A.

[0026] The cross section of the winding core 3 perpendicular to the axial direction A is a quadrilateral. In addition, the ridgeline portion of the winding core 3 with a quadrilateral cross section may be chamfered, or the cross section of the winding core 3 may be a polygonal shape such as a hexagon, a circle or an ellipse, or a shape obtained by appropriately combining these shapes.

[0027] The first flange portion 5 and the second flange portion 6 are in the shape of a quadrangular prism. The first flange portion 5 and the second flange portion 6 have mutually symmetrical shapes.

[0028] The first flange portion 5 has: a mounting surface 7 facing the mounting substrate side during installation, a top surface 8 on the side opposite to the mounting surface 7, an inner end surface 9 connecting the mounting surface 7 and the top surface 8 and facing the winding core portion 3 side, an outer end surface 10 on the side opposite to the inner end surface 9, a first side surface 11 and a second side surface 12 connecting the mounting surface 7 and the top surface 8 and the inner end surface 9 and the outer end surface 10 and facing each other.

[0029] Similarly, the second flange portion 6 has: a mounting surface 13 facing the mounting substrate side during installation, a top surface 14 on the side opposite to the mounting surface 13, an inner end surface 15 connecting the mounting surface 13 and the top surface 14 and facing the winding core portion 3 side, an outer end surface 16 on the side opposite to the inner end surface 15, a first side surface 17 and a second side surface 18 connecting the mounting surface 13 and the top surface 14 and the inner end surface 15 and the outer end surface 16 and facing each other.

[0030] The ridges of the first flange 5 and the second flange 6 may be chamfered. In addition, the first flange 5 and the second flange 6 may have shapes other than quadrangular prisms as long as they each have mounting surfaces 7, 13, inner end surfaces 9, 15 and outer end surfaces 10, 16.

[0031] Alternatively, the coil component 1 includes a top plate 19. The top plate 19 is mounted between the top surface 8 of the first flange portion 5 and the top surface 14 of the second flange portion 6. Although not shown in the figure, the top plate 19 is fixed to the core 2 by a thermosetting resin such as an epoxy adhesive. Figure 1The size of the top plate 19 in the direction perpendicular to the paper surface is preferably greater than or equal to the size of the core 2. The top plate 19 is made of ferrite or a resin containing ferrite powder, alumina powder or metal magnetic powder. In addition, the top plate 19 can also be replaced by a resin such as an ultraviolet curing resin to coat the top surface of the core 2.

[0032] The coil component 1 includes a first terminal electrode 21 and a second terminal electrode 22 provided on at least the mounting surfaces 7 and 13 of the first flange portion 5 and the second flange portion 6, respectively. The regions where the first terminal electrodes 21 and 22 are formed are Figures 1 to 4 That is, the terminal electrodes 21 and 22 are formed on the mounting surfaces 7 and 13 and are formed to extend to the inner end faces 9 and 15, the outer end faces 10 and 16, the first side faces 11 and 17, and the second side faces 12 and 18, respectively, which are adjacent to the mounting surfaces 7 and 13.

[0033] For example, the terminal electrodes 21 and 22 are formed by applying a conductive paste containing silver as a conductive component, firing it, and then plating with copper, nickel, and tin in this order. Here, for example, the thickness of the silver layer is 5 μm to 30 μm, the thickness of the copper layer is 1 μm to 5 μm, the thickness of the nickel layer is 1 μm to 5 μm, and the thickness of the tin layer is 5 μm to 20 μm.

[0034] The coil component 1 also includes: at least one wire 23 connected between the first terminal electrode 21 and the second terminal electrode 22 and wound around the winding core 3. The wire 23 includes a center wire made of a highly conductive metal such as copper, silver or gold, and the center wire is covered with a resin such as polyurethane or polyamide-imide. The diameter of the center wire of the wire 23 is not particularly limited, but is, for example, greater than 60 μm and less than 180 μm. In addition, the number of turns of the wire 23 at the winding core 3 can be arbitrarily changed according to the required characteristics.

[0035] The connection of the wire 23 to the terminal electrodes 21 and 22 is achieved by, for example, thermocompression bonding. Grooves 25 and 26 for receiving the ends of the wire 23 are provided on the mounting surfaces 7 and 13. The grooves 25 and 26 extend in a direction connecting the inner end surfaces 9 and 15 with the outer end surfaces 10 and 16. The first flange portion 5 provided with the groove 25 and the second flange portion 6 provided with the groove 26 are as shown in FIG. Figure 2 As shown in FIG. 1 , the shapes are substantially point-symmetrical. Figure 3 and Figure 4 The detailed shape of the groove 25 shown in the figure will be described, and the detailed shape of the groove 26 will be omitted.

[0036] Main reference Figure 3 and Figure 4The groove 25 provided on the mounting surface 7 of the first flange portion 5 is formed with an opening on the inner end surface 9 side. The groove 25 is formed with a bottom surface 29 sandwiched by a first side 27 and a second side 28 extending in the direction connecting the inner end surface 9 and the outer end surface 10, and a first rising surface 31 and a second rising surface 32 rising from the bottom surface 29 via the first side 27 and the second side 28, respectively. Here, compared with the second side 28, the first side 27 is located at a lead-out position 33 (refer to FIG. 2 ) where the wire 23 is led out from the winding core portion 3. Figure 2 ) is closer. Figure 3 and Figure 4 In FIG. 1 , the arrow D indicates the lead-out direction of the wire 23 .

[0037] If we focus on the bottom surface 29 of the groove 25, we can see that the interval between the first side 27 and the second side 28 is narrower on the inner end surface 9 side and wider on the outer end surface 10 side. Figure 4 As shown in FIG. 1 , the angle θ1 formed by the first side 27 and the axial direction A is smaller than the angle θ2 formed by the second side 28 and the axial direction A. Figure 4 In FIG. 1 , a line parallel to the axial direction A is shown by a dotted line L.

[0038] As described above, the shape of the bottom surface 29 of the groove 25 for storing the end of the wire 23 is limited. The interval between the first side 27 and the second side 28 is narrower on the inner end surface 9 side and wider on the outer end surface 10 side, and the angle θ1 formed by the first side 27 and the axial direction A (dashed line L) is smaller than the angle θ2 formed by the second side 28 and the axial direction A (dashed line L). Therefore, the restriction on the entry action of the wire 23 into the groove 25 is reduced. Therefore, the wire 23 can be routed with a high degree of freedom in accordance with the action of the nozzle supplying the wire 23 and the state of the wire 23. In addition, the inconsistency of the position of the wire 23 in the groove 25 can be suppressed.

[0039] When the wire material 23 is thermocompressed and bonded to the first terminal electrode 21 , a bulge having a height of 15 μm and a width of 200 μm is formed on the bottom surface 29 of the groove 25 .

[0040] As from Figure 3 As can be seen, it is preferable that the bottom surface 29 of the groove 25 is angled so as to become shallower from the inner end surface 9 side toward the outer end surface 10 side. This can reduce the damage to the wire 23 during crimping of the wire 23. Therefore, the risk of wire breakage of the wire 23 near the crimping portion can be suppressed. In addition, it is possible to avoid the disadvantage that the wire 23 becomes thinner sharply at the end.

[0041] Similarly, as from Figure 3As is known, in the groove 25 , the first rising surface 31 and the second rising surface 32 preferably form an obtuse angle with the bottom surface 29 . With this configuration, the wire 23 can be smoothly introduced into the groove 25 .

[0042] like Figure 2 As shown in FIG. 1 , preferably, regarding the first flange portion 5, when the direction perpendicular to the axial direction A in the extending direction of the mounting surface 7 is taken as the width direction, the groove 25 is offset in the width direction so as to be closer to the position 33 of the wire 23 drawn out from the winding core portion 3. As a result, as shown in FIG. Figure 2 As can be seen, the groove 25 provided in the first flange portion 5 and the groove 26 provided in the second flange portion 6 are located on opposite sides to each other in the width direction.

[0043] The wire 23 is in a state of not contacting any place before leaving the winding core 3 and reaching the flange 5. Therefore, according to the above-mentioned structure, the distance from the end of the winding of the wire 23 on the winding core 3 to the introduction groove 25 can be made shorter, so the distance of the aerial wiring of the wire 23 can be shortened, thereby reducing the risk of wire breakage.

[0044] As from Figure 2 As can be seen, the interval between the first side 27 and the second side 28 defining the bottom surface 29 of the groove 25 is preferably larger than the diameter of the wire 23. That is, the width of the groove 25 on the inner end surface 9 side and the width on the outer end surface 10 side are preferably larger than the diameter of the wire 23. According to this structure, the wire 23 can be easily accommodated within the width direction dimension of the groove 25.

[0045] Although there is no special diagram, Figures 2 to 4 By analogy, it is preferable that the depth of the groove 25 represented by the height difference between the mounting surface 7 of the first flange portion 5 and the bottom surface 29 of the groove 25 is smaller than the diameter of the wire 23. According to this structure, when the wire 23 is crimped, a part of the cross section of the wire 23 protrudes from the groove 25, so that crimping can be easily achieved.

[0046] Although detailed description is omitted, the groove 26 provided on the mounting surface 13 of the second flange portion 6 also adopts the same structure as the groove 25 described above. However, the groove 25 may be provided only on the first flange portion 5 side. In addition, the grooves 25 and 26 may be provided on the first flange portion 5 and the second flange portion respectively, and the characteristic structure described above may be adopted only in the groove 25.

[0047] The coil component 1 is manufactured, for example, as follows.

[0048] In order to obtain a drum-shaped core 2, the molded body obtained by pressing and molding the ferrite powder through a mold is fired, and after firing, the drum is polished to remove burrs. At this time, the edge line part of the core 2 is chamfered and given a smaller arc surface. The base electrode is formed on the mounting surface 7, 13 of the flange part 5, 6 of the obtained core 2, and then the electrolytic tube is applied to form a plating film. Thereafter, the wire 23 is wound around the winding core part 3 of the core 2 using a nozzle, and then the end of the wire 23 is hot-pressed to the terminal electrodes 21, 22 using a heating nozzle. During the hot pressing, for example, a temperature of 500°C and 1 second such a pressing condition is applied. After the pressing, the temperature of the heating nozzle is lowered, and when the temperature reaches below 300°C, the heating nozzle is withdrawn. Then, the excess part of the wire 23 connected to the terminal electrodes 21, 22 is cut off by a cutting knife.

[0049] When the top plate 19 is provided, the top plate 19 is then fixed to the core 2 via an adhesive. When the surface is coated with a resin instead of the top plate 19, the resin is applied to the core 2 and then cured.

[0050] The obtained coil component 1 has a dimension in the axial direction A of 3.2 mm, for example. Figure 1 The width dimension perpendicular to the paper surface is 2.5 mm. Figure 2 The dimension in the height direction perpendicular to the paper surface is 2.5 mm.

[0051] Below, refer to Figures 5 to 8 , other embodiments of the present invention are described. Figures 5 to 8 is equivalent to Figure 4 Figure. Figures 5 to 8 In, equivalent to Figure 4 The same reference numerals are used to denote the elements shown in the figure, and duplicate descriptions are omitted.

[0052] exist Figures 5 to 8 In each of the embodiments shown, the first flange portion 5 shown in the figure and the second flange portion not shown in the figure also have substantially point-symmetrical shapes with each other. Therefore, the first flange portion 5 shown in the figure will be described, and the description of the second flange portion not shown in the figure will be omitted.

[0053] In the aforementioned Figure 4 In the core 2 of the first embodiment shown, the angle θ1 formed by the first side 27 and the axial direction A (dashed line L) is an angle measured in the clockwise direction, and the angle θ2 formed by the second side 28 and the axial direction A (dashed line L) is an angle measured in the counterclockwise direction.

[0054] In contrast, Figure 5In the core 2a of the second embodiment shown, the angle θ1 formed by the first side 27 and the axial direction A (dashed line L) and the angle θ2 formed by the second side 28 and the axial direction A (dashed line L) are both angles measured in the counterclockwise direction. In this case, in the second embodiment, the angle θ1 formed by the first side 27 and the axial direction A (dashed line L) is also smaller than the angle θ2 formed by the second side 28 and the axial direction A (dashed line L).

[0055] exist Figure 6 In the core body 2b of the third embodiment shown, as can be seen from the arrow D indicating the lead-out direction, the first side 27 located closer to the lead-out position of the wire from the winding core 3 extends parallel to the axial direction A (dashed line L). As described above, when the groove 25 is offset in the width direction to be closer to the position where the wire is led out from the winding core 3, it is advantageously possible to adopt Figure 6 In the case of the third embodiment, the inner angle between the first rising surface 31 and the bottom surface 29 may be a right angle.

[0056] According to the third embodiment, the design of the mold for manufacturing the core body 2b is facilitated, and therefore, it can be expected that the core body 2b can be manufactured more easily.

[0057] exist Figure 7 In the core 2 c of the fourth embodiment shown, the groove 25 is formed with an opening not only on the inner end surface 9 side but also on the outer end surface 10 side.

[0058] In the first to fourth embodiments described above, the bottom surface 29 of the groove 25 is located inside the side surface 35 of the winding core 3 in the width direction. Figure 8 In the core body 2d of the fifth embodiment shown, the bottom surface 29 of the groove 25 is located outside the side surface 35 of the winding core portion 3 in the width direction. In the case of the fifth embodiment, as can be seen from the arrow D indicating the lead-out direction, the angle θ1 formed by the first side 27 closer to the lead-out position of the wire from the winding core portion 3 and the axial direction A (dashed line L) is smaller than the angle θ2 formed by the second side 28 and the axial direction A (dashed line L).

[0059] Although the present invention has been described above in relation to the embodiment shown in the drawings, various other modifications are possible within the scope of the present invention.

[0060] For example, the coil component targeted by the present invention may be a structure constituting a common mode choke coil, a transformer, a balanced converter, etc., in addition to constituting a single coil as in the illustrated embodiment. Therefore, the number of wires may be changed according to the function of the coil component, and accordingly, the number of terminal electrodes and the number of slots provided on each flange portion may also be changed.

[0061] In addition, the shapes of the winding core and the top plate provided in the coil component are not limited to the shapes shown in the drawings, and can be arbitrarily changed according to a desired design.

[0062] Furthermore, when configuring the coil component according to the present invention, it is possible to replace or combine parts of the structures among the different embodiments described in this specification.

[0063] The embodiments of the present invention include the following.

[0064] <1> A coil component, comprising a core body, the core body having: a winding core portion extending in an axial direction; and a first flange portion and a second flange portion respectively arranged at a first end portion and a second end portion of the winding core portion located at opposite positions in the axial direction, the first flange portion and the second flange portion each having: a mounting surface facing the mounting substrate side during mounting, an inner end surface facing the winding core portion side, and an outer end surface on the side opposite to the inner end surface, the coil component further comprising: a first terminal electrode and a second terminal electrode, which are respectively arranged on at least the mounting surfaces of the first flange portion and the second flange portion; and at least one wire material, which is connected between the first terminal electrode and the second terminal electrode and is wound around the winding core portion, and is on the mounting surface of at least one of the first flange portion and the second flange portion. A groove is provided, which is a portion for accommodating the end portion of the wire rod and extends in a direction connecting the inner end face with the outer end face. The groove is in a state where an opening is formed on at least the inner end face side, and is formed with a bottom face sandwiched by a first side and a second side respectively extending in a direction connecting the inner end face with the outer end face, and a first rising face and a second rising face respectively rising from the bottom face via the first side and the second side. Compared with the second side, the first side is located closer to a lead-out position of the wire rod from the winding core portion, the interval between the first side and the second side is narrower on the inner end face side and wider on the outer end face side, and an angle formed by the first side and the axial direction is smaller than an angle formed by the second side and the axial direction.

[0065] <2> In the coil component described in <1>, the grooves are provided on the mounting surfaces of the first flange portion and the second flange portion, respectively.

[0066] <3> In the coil component described in <1> or <2>, the groove is angled with respect to the bottom surface and becomes shallower from the inner end surface side toward the outer end surface side.

[0067] <4> In the coil component according to any one of <1> to <3>, an inner angle formed by each of the first rising surface and the second rising surface and the bottom surface is an obtuse angle.

[0068] <5> In the coil component described in any one of <1> to <4>, when the direction perpendicular to the axial direction in the extension direction of the above-mentioned mounting surface is taken as the width direction, the above-mentioned groove is offset in the above-mentioned width direction and is closer to the position where the above-mentioned wire is led out from the above-mentioned winding core portion.

[0069] <6> In the coil component described in <5>, the first side extends parallel to the axial direction.

[0070] <7> In the coil component according to any one of <1> to <6>, a distance between the first side and the second side is larger than a diameter of the wire material.

[0071] <8> In the coil component according to any one of <1> to <7>, a depth of the groove represented by a height difference between the mounting surface and the bottom surface is smaller than a diameter of the wire rod.

Claims

1. A coil component, characterized in that: A core body is provided, wherein the core body has: a winding core portion extending in an axial direction; and a first flange portion and a second flange portion respectively provided at a first end portion and a second end portion of the winding core portion located at opposite positions in the axial direction. The first flange portion and the second flange portion each have a mounting surface facing the mounting substrate side during mounting, an inner end surface facing the winding core side, and an outer end surface on the side opposite to the inner end surface. The coil component further comprises: a first terminal electrode and a second terminal electrode, which are provided on at least the mounting surfaces of the first flange portion and the second flange portion, respectively; and at least one wire connecting between the first terminal electrode and the second terminal electrode and wound around the winding core, A groove is provided on the mounting surface of at least one of the first flange portion and the second flange portion, the groove being a portion for accommodating an end portion of the wire and extending in a direction connecting the inner end surface and the outer end surface. The groove is in a state where at least the inner end surface side is formed with an opening, and a bottom surface is formed which is sandwiched by a first side and a second side which extend in a direction connecting the inner end surface and the outer end surface, and a first rising surface and a second rising surface which rise from the bottom surface via the first side and the second side, respectively. The first side is located closer to a lead-out position of the wire from the winding core than the second side. The interval between the first side and the second side is narrower on the inner end surface side and wider on the outer end surface side, and An angle formed by the first side and the axial direction is smaller than an angle formed by the second side and the axial direction.

2. The coil component according to claim 1, characterized in that The grooves are respectively provided on the mounting surfaces of the first flange portion and the second flange portion.

3. The coil component according to claim 1 or 2, characterized in that: The groove is formed by giving an angle to the bottom surface and becoming shallower from the inner end surface side toward the outer end surface side.

4. The coil component according to claim 1 or 2, characterized in that: The inner angles formed by the first rising surface and the second rising surface and the bottom surface are obtuse angles.

5. The coil component according to claim 1 or 2, characterized in that: When a direction perpendicular to the axial direction among the extending directions of the mounting surface is defined as a width direction, the groove is offset in the width direction and is closer to a position where the wire is drawn out from the winding core.

6. The coil component according to claim 5, characterized in that The first side extends parallel to the axial direction.

7. The coil component according to claim 1 or 2, characterized in that: The interval between the first side and the second side is larger than the diameter of the wire.

8. The coil component according to claim 1 or 2, characterized in that: The depth of the groove represented by the height difference between the mounting surface and the bottom surface is smaller than the diameter of the wire.

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