Coil parts

Abstract

To provide a coil component capable of holding a core in a stable posture using a chuck in a winding step of a wire.SOLUTION: A core 5 comprises: a winding core part 2 extending in an axial direction AX; and a first flange part 3 and a second flange part 4 provided in mutually opposite ends of the winding core part 2 in the axial direction AX. Outer end faces 13 and 14 of the first flange part 3 and the second flange part 4 include a first projected line 25 extending along a ridge line where the outer end faces 13 and 14 cross first side faces 15 and 16 and a second projected line 26 extending along a ridge line where the outer end faces 13 and 14 cross second side faces 17 and 18. Clearances are provided between a fixture part 28 of terminal electrodes 23 and 24 and each of the first projected line 25 and the second projected line 26, and an adhesive layer is formed so as to fill the clearances between each of the first projected line 25 and the second projected line 26 and the fixture part 28.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wire-wound coil component having a structure in which a wire is wound around a core, and in particular to the shape of a flange portion provided on the core. [Background technology]

[0002] For example, Japanese Patent Application Laid-Open Publication No. 2009-16502 (Patent Document 1) describes a method for manufacturing a common mode choke coil. Manufacturing a common mode choke coil involves a process of winding a wire around a winding core provided in a core. In the winding process, the core is rotated around the central axis of the winding core, and the wire is fed from a nozzle toward the winding core while traversing the core. This causes the wire to be wound spirally around the winding core.

[0003] In this winding process, the core is held by a chuck connected to a rotary drive source to rotate the core as described above. The chuck is designed to grip one of two flanges provided at opposite ends of the winding core in the axial direction.

[0004] More specifically, the flange typically has a mounting surface that faces the mounting board during mounting, a top surface that faces the opposite side of the mounting surface, an inner end surface that connects the mounting surface and the top surface and faces the winding core and positions an end of the winding core in the axial direction, an outer end surface that faces the opposite side of the inner end surface, and first and second side surfaces that connect the inner and outer end surfaces and face in opposite directions.In contrast, the chuck typically has a surface that contacts the outer end surface of one of the flanges and surfaces that contact the first and second side surfaces of the flanges, respectively.

[0005] The action of the chuck gripping the flange is achieved by the chuck contacting the outer end face of the flange and the member providing the surface contacting the first side face and the member providing the surface contacting the second side face approaching each other. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-16502 Summary of the Invention [Problem to be solved by the invention]

[0007] As coil components become smaller, the dimensions of the flange, specifically the distance between the outer and inner end faces of the flange, become shorter. As a result, the area where the first and second side faces of the flange come into contact with the chuck becomes smaller, making it difficult for the chuck to hold the core in a stable position. This can cause the core's central axis of rotation to deviate from the central axis of the winding core, preventing the core from rotating properly.

[0008] Furthermore, in order to increase the number of possible windings of the wire around the winding core without increasing the size of the coil component, it is possible to make the axial dimension of the winding core longer while reducing the thickness of the flange, but in this case, the above-mentioned problems become more pronounced.

[0009] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a coil component in which the core can be held in a stable position by a chuck during the wire winding process. [Means for solving the problem]

[0010] The present invention is directed to a coil component comprising: a core having a winding core portion extending in an axial direction and a first flange portion and a second flange portion provided at opposite axial ends of the winding core portion, respectively; a first terminal electrode provided at the first flange portion; a second terminal electrode provided at the second flange portion; and at least one wire connected to the first terminal electrode and the second terminal electrode and wound around the winding core portion.

[0011] Each of the first flange portion and the second flange portion has a mounting surface that faces the mounting board during mounting, a top surface that faces the opposite side of the mounting surface, an inner end surface that connects the mounting surface and the top surface and faces the winding core portion and positions the end of the winding core portion in the axial direction, an outer end surface that faces the opposite side of the inner end surface, and a first side surface and a second side surface that connect the inner end surface and the outer end surface and face in opposite directions to each other.

[0012] In order to solve the above-mentioned technical problems, in this invention, the outer end surface of each of the first flange portion and the second flange portion has a first convex streak extending along the ridge line where the outer end surface and the first side surface intersect, and a second convex streak extending along the ridge line where the outer end surface and the second side surface intersect, the first terminal electrode and the second terminal electrode are made of a metal plate having a thickness equal to or less than the protruding height of the first convex streak and the second convex streak, and each has a fixing portion that is arranged along an area of the outer end surface where the first convex streak and the second convex streak are not provided and is fixed to the first flange portion and the second flange portion, respectively, via an adhesive, a gap is provided between the fixing portion and each of the first convex streak and the second convex streak, and an adhesive layer derived from the adhesive is formed so as to fill the gap between each of the first convex streak and the second convex streak and the fixing portion. [Effects of the Invention]

[0013] According to this invention, even if the coil component is miniaturized and therefore the core is miniaturized, the presence of the first and second convex ridges makes it possible to ensure a relatively large contact area between the chuck and the flange portion or an area over which the contact portion is distributed, so that the core can be held in a stable position during the wire winding process. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing the appearance of a coil component 1 according to a first embodiment of the present invention, with mounting surfaces 7 and 8 facing upward. [Figure 2] 2 is a bottom view showing the appearance of the coil device 1 shown in FIG. 1, viewed from the mounting surfaces 7 and 8 side. [Figure 3]2 is a front view showing the appearance of the coil component 1 shown in FIG. 1, with mounting surfaces 7 and 8 facing upward. [Figure 4] 2 is a left side view showing the appearance of the coil device 1 shown in FIG. 1, with mounting surfaces 7 and 8 facing upward. [Figure 5] 2 is a perspective view showing the appearance of a core 5 included in the coil component 1 shown in FIG. 1, with mounting surfaces 7 and 8 facing upward. [Figure 6] 6 is a bottom view showing the appearance of the core 5 shown in FIG. 5, viewed from the mounting surfaces 7 and 8 side. [Figure 7] 6 is a front view showing the appearance of the core 5 shown in FIG. 5, with the mounting surfaces 7 and 8 facing upward. [Figure 8] 6 is a left side view showing the appearance of the core 5 shown in FIG. 5, with the mounting surfaces 7 and 8 facing upward. [Figure 9] FIG. 5 is an enlarged view of a part of the right side view shown in FIG. 4. [Figure 10] FIG. 10 is a cross-sectional view taken along line XX in FIG. 9. [Figure 11] FIG. 10 is a perspective view showing the appearance of a coil component 41 according to a second preferred embodiment of the present invention, with mounting surfaces 7 and 8 facing upward. [Figure 12] 12 is a perspective view showing the appearance of a core 42 included in the coil component 41 shown in FIG. 11, with mounting surfaces 7 and 8 facing upward. DETAILED DESCRIPTION OF THE INVENTION

[0015] A coil component 1 according to a first embodiment of the present invention will be described with reference to FIGS.

[0016] The coil device 1 includes a drum-shaped core 5 having a winding core 2 extending in the axial direction AX and a first flange 3 and a second flange 4 provided at opposite ends of the winding core 2 in the axial direction AX. The core 5 is made of, for example, ferrite, or a resin containing ferrite powder or metal magnetic powder. In the illustration, 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 mounting surface 7 that faces the mounting board during mounting, a top surface 9 that faces the opposite side of the mounting surface 7, and connects the mounting 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 mounting surface 8 that faces the mounting board during mounting, a top surface 10 that faces the opposite side of the mounting surface 8, an inner end surface 12 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 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 mounting surfaces 7 and 8 face the top surfaces 9 and 10.

[0020] The coil component 1 constitutes, for example, a common mode choke coil and includes a first wire 21 and a second wire 22 wound around the winding core 2 of the core 5. As is well known, in a common mode choke coil, the first wire 21 and the second wire 22 are wound in the same direction around the winding core 2. In the illustrated example, the first wire 21 is wound around the winding core 2 so as to be in contact with the winding core 2, and the second wire 22 is wound around the winding core 2 so as to be in contact with the outer periphery of the first wire 21. The wires 21 and 22 include a central wire made of a highly conductive metal such as copper, silver, or gold, and an insulating coating made of an electrically insulating resin such as polyamideimide, polyurethane, or polyesterimide that covers the central wire. The wires 21 and 22 preferably have a diameter of 20 μm or more and 60 μm or less.

[0021] A first terminal electrode 23 is provided on the first flange 3, and a second terminal electrode 24 is provided on the second flange 4. Two first terminal electrodes 23 are provided on the first flange 3, spaced apart from each other and side by side in the width direction WD, and two second terminal electrodes 24 are provided on the second flange 4, spaced apart from each other and side by side in the width direction WD.

[0022] In order to distinguish the two first terminal electrodes 23 from each other, one first terminal electrode is given the reference symbol "23A" and the other first terminal electrode is given the reference symbol "23B". In addition, when distinguishing the two second terminal electrodes 24 from each other, one second terminal electrode is given the reference symbol "24A" and the other second terminal electrode is given the reference symbol "24B".

[0023] The first end and the second end of the first wire 21 are connected to the first terminal electrode 23A and the second terminal electrode 24B by thermocompression bonding, respectively. The first end and the second end of the second wire 22 are connected to the first terminal electrode 23B and the second terminal electrode 24A by thermocompression bonding, respectively.

[0024] The outer end face 13 of the first flange portion 3 is provided with a first convex rib 25 extending along the ridge where the outer end face 13 and the first side face 15 intersect, and a second convex rib 26 extending along the ridge where the outer end face 13 and the second side face 17 intersect.

[0025] Similarly, the outer end face 14 of the second flange portion 4 is provided with a first convex rib 25 extending along the ridge where the outer end face 14 and the first side face 16 intersect, and a second convex rib 26 extending along the ridge where the outer end face 14 and the second side face 18 intersect.

[0026] The first ridge 25 and the second ridge 26 have, as an example, a width dimension of 0.2 mm and a protruding height of 0.1 mm.

[0027] According to this configuration, even if the coil component 1 is miniaturized and therefore the core 5 is miniaturized, the presence of the first convex rib 25 and the second convex rib 26 makes it possible to ensure a relatively large contact area or area where the contact portion is distributed between the chuck and the flange portions 3 and 4, and therefore the core 5 can be held in a stable position during the winding process of the wires 21 and 22.

[0028] The first terminal electrode 23 and the second terminal electrode 24 are preferably made of a metal plate having a thickness equal to or less than the protrusion height of the first ridge 25 and the second ridge 26. The metal plate constituting the terminal electrodes 23 and 24 may be, for example, a copper base plate with nickel and tin plated in this order on the outward facing surface.

[0029] The first terminal electrode 23 has a fixing portion 28 that is arranged along a region of the outer end surface 13 of the first flange 3 where the first ridge 25 and the second ridge 26 are not provided, and that is fixed to the first flange 3 via an adhesive 27 (see FIGS. 9 and 10). Similarly, the second terminal electrode 24 has a fixing portion 28 that is arranged along a region of the outer end surface 14 of the second flange 4 where the first ridge 25 and the second ridge 26 are not provided, and that is fixed to the second flange 4 via an adhesive 27.

[0030] With the above configuration, the first terminal electrode 23, the second terminal electrode 24, and the adhesive 27 do not interfere with the chuck. Therefore, the core 5 can be held in a stable position by the chuck during the winding process of the wires 21 and 22.

[0031] 9 and 10 , a gap is provided between the fixing portion 28 and each of the first and second ridges 25 and 26, and the adhesive 27 described above forms an adhesive layer 27a that is formed so as to fill the gap between the fixing portion 28 and each of the first and second ridges 25 and 26. The presence of the adhesive layer 27a contributes to improving the bonding strength of the first terminal electrode 23 and the second terminal electrode 24 to the first flange 3 and the second flange 4. The thickness of the portion of the adhesive layer 27a that is formed so as to fill the gap between the fixing portion 28 and each of the first and second ridges 25 and 26 is preferably thinner than the thickness of the first terminal electrode 23, the thickness of the second terminal electrode 24, the protruding height of the first ridge 25, and the protruding height of the second ridge 26.

[0032] For example, a thermosetting epoxy resin is used as the adhesive 27. In order to improve the thermal shock resistance of the adhesive 27, an inorganic filler such as a silica filler may be added to the adhesive 27. A dispensing method can be used as a method for applying the adhesive 27.

[0033] 6, two first rounded surfaces R1 are formed on the edge of the first protrusion 25 on the second side surfaces 17 and 18 side and the edge of the second protrusion 26 on the first side surfaces 15 and 16 side, and a second rounded surface R2 is formed on the edge of the first protrusion 25 on the first side surfaces 15 and 16 side and the edge of the second protrusion 26 on the second side surfaces 17 and 18 side. The radius of curvature defining the first rounded surface R1 is preferably smaller than the radius of curvature defining the second rounded surface R2. This makes it difficult for the adhesive 27 to wet and spread to the outer periphery of the core 5, and prevents or suppresses the adhesive 27 from undesirably increasing the outer dimensions of the coil component 1.

[0034] 6, the dimension in the width direction WD of the region on the outer end faces 13 and 14 where the first ridges 25 and the second ridges 26 are not provided is preferably larger than the dimension in the width direction WD of the winding core portion 2. The larger the dimension in the width direction WD of the region on the outer end faces 13 and 14 where the first ridges 25 and the second ridges 26 are not provided, the larger the contact area between the fixing portions 28 of the terminal electrodes 23 and 24 and the outer end faces 13 and 14 can be, and therefore the fixing strength of the terminal electrodes 23 and 24 to the flange portions 3 and 4 can be increased.

[0035] As clearly shown in Figures 1, 4, 5 and 8, it is preferable that a raised portion 29 is provided on each mounting surface 7 and 8 of the first flange 3 and the second flange 4 in the center in the width direction WD, and that shoulder portions 30 lower than the raised portion 29 are formed on both sides of the raised portion 29 in the width direction.

[0036] The first terminal electrode 23 and the second terminal electrode 24 have portions that extend in an S-shaped curve along the protrusion 29 and shoulder 30 on the mounting surfaces 7 and 8 of the first flange 3 and the second flange 4, respectively.

[0037] In each of the first terminal electrode 23 and the second terminal electrode 24, the connection portion with the mounting substrate (not shown) is provided by a portion 31 extending along the protrusion 29, and the connection portion with the wires 21 and 22 is provided by a portion 32 extending along the shoulder portion 30.

[0038] With this configuration, a sufficient distance can be secured between the connection portions of the wires 21 and 22 at the terminal electrodes 23 and 24 and the connection portions with the mounting board, making it difficult for the soldering flux used for connection to the mounting board to penetrate into the coil component 1 along the wires 21 and 22.

[0039] The first ridge 25 and the second ridge 26 described above abut against a portion 32 extending along the shoulder 30 of each of the first terminal electrode 23 and the second terminal electrode 24. This allows the portion 32 of the terminal electrodes 23 and 24 extending along the shoulder 30, which serves as the connection portion with the wires 21 and 22, to be supported by the abutment of the first ridge 25 and the second ridge 26, so that the position of the portion 32 of the terminal electrodes 23 and 24 can be stably and firmly maintained during the thermocompression bonding process of the wires 21 and 22.

[0040] Instead of metal plates, terminal electrodes 23 and 24 may be formed by conductive films formed on flanges 3 and 4. In this case, for example, base electrodes are formed by baking silver paste on mounting surfaces 7 and 8 of flanges 3 and 4, and base electrodes are formed by vapor deposition of silver on outer end surfaces 13 and 14 of flanges 3 and 4, and these base electrodes are plated with copper, nickel, and tin in this order.

[0041] In terms of dimensions measured in the axial direction AX, the dimensions of winding core 2 are preferably three to four times the dimensions of each of first flange 3 and second flange 4 (the dimensions from each of inner end faces 11 and 12 to each of outer end faces 13 and 14, including ridges 25 and 26). This configuration allows the number of possible windings of wires 21 and 22 around winding core 2 to be increased without increasing the size of coil device 1.

[0042] In the first flange 3, the sum of the widthwise dimension of the first ridge 25 and the widthwise dimension of the second ridge 26 is preferably ½ or less, and more preferably ⅓ or less, of the distance between the first side surface 15 and the second side surface 17. Similarly, in the second flange 4, the sum of the widthwise dimension of the first ridge 25 and the widthwise dimension of the second ridge 26 is preferably ½ or less, and more preferably ⅓ or less, of the distance between the first side surface 16 and the second side surface 18.

[0043] The above configuration is effective when compression molding core 5. That is, when compression molding core 5, if mounting surfaces 7 and 8 and top surfaces 9 and 10 are positioned above and below, and powder as molding material is pressed from above and below, sufficient pressure can be applied to the ridges 25 and 26. Therefore, sufficient strength can be ensured in ridges 25 and 26.

[0044] The coil component 1 includes a top plate 35 that connects the top surface 9 of the first flange 3 and the top surface 10 of the second flange 4 of the core 5. The top plate 35 is bonded to the core 5 with an adhesive. For example, a thermosetting epoxy resin is used as the adhesive. To improve the thermal shock resistance of the adhesive, an inorganic filler such as silica filler may be added to the adhesive. Adhesive application methods include printing the adhesive onto the top plate 35, dipping the top surfaces 9 and 10 of the flanges 3 and 4 of the core 5 into the adhesive, and dispensing the adhesive onto both the top plate 35 and the core 5. The top plate 35 may be made of ferrite, a non-conductive material other than ferrite, or a resin containing ferrite powder or metallic magnetic powder. When both the core 5 and the top plate 35 are made of magnetic materials, the core 5 and the top plate 35 form a closed magnetic circuit. Instead of the top plate 35, a resin coating may be used. It is noted that the top plate 35 may be omitted, and the resin coating may be omitted.

[0045] Fig. 11 is a perspective view showing the appearance of a coil device 41 according to a second embodiment of the present invention, with mounting surfaces 7 and 8 facing upward. Fig. 12 is a perspective view showing the appearance of a core 42 provided in the coil device 41 shown in Fig. 11, with mounting surfaces 7 and 8 facing upward. Fig. 11 corresponds to Fig. 1, and Fig. 12 corresponds to Fig. 5. In Figs. 11 and 12, elements corresponding to elements shown in Figs. 1 and 5, respectively, are given the same reference numerals, and duplicate explanations will be omitted.

[0046] The coil component 41 according to the second embodiment is characterized in that, compared to the coil component 1 according to the first embodiment, a third ridge 43 is further provided between the first ridge 25 and the second ridge 26 on the outer end surfaces 13 and 14 of the first flange 3 and the second flange 4. As an example, the third ridge 43 has a width dimension of 0.4 mm and a protruding height of 0.1 mm.

[0047] The presence of third ridge 43 can ensure a larger contact area between the chuck and flanges 3 and 4, so that core 5 can be held in a more stable position during the process of winding wires 21 and 22.

[0048] Although one third protrusion 43 is provided at the center in the width direction of each of the outer end faces 13 and 14, a plurality of third protrusions may be provided by appropriately changing the arrangement.

[0049] Although the present invention has been described above with reference to the illustrated embodiment, various other embodiments are possible within the scope of the present invention.

[0050] For example, the coil component to which the present invention is directed may be one that constitutes a common mode choke coil as in the illustrated embodiment, or one that constitutes a single coil, a transformer, a 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 may also be changed accordingly.

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

[0052] 1,41 Coil parts 2 Winding core 3 First flange 4 Second flange 5,42 cores 7,8 Mounting surface 9,10 Top 11,12 Inner end face 13,14 Outer end face 15,16 1st side 17,18 Second aspect 21,22 Wire 23,23A,23B 1st terminal electrode 24,24A,24B 2nd terminal electrode 25 1st protrusion 26 Second protrusion 27 Adhesive 27a Adhesive layer 28 Fixation part 29 Ridge 30 Shoulder 31 Part extending along the ridge 32 Part extending along the shoulder 43 Third protrusion AX Axial direction WD Width direction HD Height Method R1 First curved surface R2 Second curved surface

Claims

1. a core having a winding core portion extending in an axial direction and a first flange portion and a second flange portion respectively provided at opposite ends of the winding core portion in the axial direction; a first terminal electrode provided on the first flange; a second terminal electrode provided on the second flange; at least one wire connected to the first terminal electrode and the second terminal electrode and wound around the winding core; Equipped with each of the first flange portion and the second flange portion has a mounting surface that faces the mounting board side during mounting, a top surface that faces the opposite side of the mounting surface, an inner end surface that connects the mounting surface and the top surface and faces the winding core portion and positions an end of the winding core portion in the axial direction, an outer end surface that faces the opposite side to the inner end surface, and a first side surface and a second side surface that connect the inner end surface and the outer end surface and face in opposite directions to each other, the outer end surface of each of the first flange portion and the second flange portion has a first protrusion extending along a ridge line where the outer end surface and the first side surface intersect, and a second protrusion extending along a ridge line where the outer end surface and the second side surface intersect, the first terminal electrode and the second terminal electrode are made of a metal plate having a thickness equal to or less than the protruding height of the first convex streak and the second convex streak, and each has a fixing portion that is arranged along an area of the outer end surface where the first convex streak and the second convex streak are not provided and is fixed to the first flange portion and the second flange portion, respectively, via an adhesive; a gap is provided between the fixing portion and each of the first protrusion and the second protrusion, an adhesive layer derived from the adhesive is formed so as to fill the gap between each of the first convex ridge and the second convex ridge and the fixing portion; Coil parts.

2. 2. The coil component according to claim 1, wherein a thickness of a portion of the adhesive layer derived from the adhesive that is formed to fill the gap is thinner than any of a thickness of the first terminal electrode, a thickness of the second terminal electrode, a protruding height of the first convex ridge, and a protruding height of the second convex ridge.

3. a first rounded surface is formed on an edge of the first protrusion on the second side surface side and an edge of the second protrusion on the first side surface side, and a second rounded surface is formed on an edge of the first protrusion on the first side surface side and an edge of the second protrusion on the second side surface side, a radius of curvature defining the first curved surface is smaller than a radius of curvature defining the second curved surface; The coil component according to claim 1 or 2.

4. 4. The coil component according to claim 1, wherein, when a direction in which the first side surface and the second side surface face each other is defined as a width direction, a width dimension of a region on the outer end surface where the first convex rib and the second convex rib are not provided is larger than a width dimension of the winding core portion.

5. When the direction in which the first side surface and the second side surface face each other is defined as a width direction, a protruding portion that rises in a central portion in the width direction is provided on the mounting surface of each of the first flange portion and the second flange portion, and shoulder portions that are lower than the protruding portion are formed on both sides in the width direction of the protruding portion, the first terminal electrode and the second terminal electrode each have a portion extending along the protruding portion and the shoulder portion on the mounting surface of the first flange portion and the second flange portion, In each of the first terminal electrode and the second terminal electrode, a portion for connection with a mounting substrate is provided by a portion extending along the protrusion, and a portion for connection with the wire is provided by a portion extending along the shoulder, At least one of the first protrusion and the second protrusion abuts against a portion of each of the first terminal electrode and the second terminal electrode that extends along the shoulder portion. The coil component according to any one of claims 1 to 4.

6. 6. The coil component according to claim 1, wherein the dimension of the winding core portion measured in the axial direction is three times or more and four times or less than the dimension of each of the first flange portion and the second flange portion.

7. 7. The coil component according to claim 1, wherein, when the direction in which the first side surface and the second side surface face each other is defined as a width direction, the sum of the width direction dimensions of the first convex rib and the width direction dimensions of the second convex rib is equal to or less than 1 / 2 of the distance between the first side surface and the second side surface.

8. 8. The coil component according to claim 7, wherein a sum of a widthwise dimension of the first protrusion and a widthwise dimension of the second protrusion is equal to or less than one-third of a distance between the first side surface and the second side surface.

9. 9. The coil component according to claim 1, wherein the outer end surface further includes at least one third ridge between the first ridge and the second ridge.

10. 10. The coil component according to claim 9, wherein, when a direction in which the first side surface and the second side surface face each other is defined as a width direction, a width dimension of a region on the outer end surface in which none of the first convex rib, the second convex rib, and the third convex rib is provided is larger than a width dimension of the winding core portion.

11. 11. The coil component according to claim 9 or 10, wherein, when the direction in which the first side surface and the second side surface face each other is defined as a width direction, a sum of a width direction dimension of the first convex streak, a width direction dimension of the second convex streak, and a width direction dimension of the third convex streak is equal to or less than ½ of a distance between the first side surface and the second side surface.

12. 12. The coil component according to claim 11, wherein a sum of a width direction dimension of the first convex streak, a width direction dimension of the second convex streak, and a width direction dimension of the third convex streak is 1 / 3 or less of a distance between the first side surface and the second side surface.

Images