Coil component

Abstract

The present invention provides a coil component in which the thickness on the top surface of the flange portion is ensured, and a crack is less likely to occur, for a cover member configured to cover a core from the top surface of a first flange portion to the top surface of a second flange portion. The cover member (25) includes an ultraviolet-curable resin (26) and a filler (27) composed of flat particles having a long axis and a short axis. Preferably, as the filler (27), talc particles are used, the filler (27) included in the portion of the cover member (25) that covers the top surface (17) of the flange portion (5) has the long axis extending in a direction parallel or substantially parallel to the extending direction of the top surface (17), in a cross section of the cover member (25) along a plane that passes through the central axis of the winding core portion and is orthogonal to the top surface (17), the filler (27) included in the portion of the cover member (25) that covers the top surface (17) has an area ratio of 15.0% or more and 50.1% or less, and the particle diameter of the filler (27) is 1 μm or more and 30 μm or less in terms of D50.

Description

Technical Field

[0001] The present invention relates to coil components, and more particularly to coil components having a core and a cover component, the core having a core portion obtained by winding wire and a first flange portion and a second flange portion respectively disposed at each end of the core portion, the cover component being configured to cover the core portion from the top surface of the first flange portion to the top surface of the second flange portion. Background Technology

[0002] As a technology of interest to this invention, for example, Japanese Patent Application Publication No. 2008-10675 (Patent Document 1) describes a coil component that includes a core having a wound core portion obtained by winding wire and a first flange portion and a second flange portion respectively disposed at opposite ends in the axial direction of the wound core portion. The coil component also includes a cover portion (in Patent Document 1, referred to as an "outer resin portion") configured to cover the core portion from the top surface of the first flange portion to the top surface of the second flange portion.

[0003] A cover component is a component used to protect wires from the influence of the external environment. It is used in the process of installing coil components at a specified position on a wiring board, and when selecting coil components, the cover component is used to provide a flat suction surface for the vacuum chuck.

[0004] Patent document 1 describes a cover component made of a curable resin such as an epoxy thermosetting resin or an ultraviolet curable resin.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2008-10675

[0006] The vast majority of existing coil components are designed with general consumer devices in mind. In other words, existing coil components cannot always be considered as designs for use in automotive devices or other applications requiring high reliability.

[0007] In particular, when considering the cover components made of resin, during thermal shock tests conducted to meet high reliability requirements for automotive devices, large compressive stresses are applied, sometimes causing cracks to appear on the surface of the wire covering the winding core in the cover components. Summary of the Invention

[0008] Therefore, the object of the present invention is to provide a coil component having a cover component that is less prone to producing cracks as described above.

[0009] It is known that by increasing the thickness of the portion of the cover component located on the flange, the aforementioned cracks can be less likely to occur. On the other hand, it is also known that the thickness of the portion of the cover component located on the flange can easily vary among the various coil components, and due to the differences in the coil components, it is sometimes impossible to obtain a sufficiently thick portion.

[0010] The present invention arises from the above-mentioned understanding. The coil component of the present invention includes a core having: a winding core extending along an axial direction; and a first flange and a second flange respectively disposed at a first end and a second end of the winding core opposite to each other in the axial direction. The first flange and the second flange each have: an inner end face located at the first end and the second end of the winding core, respectively; an outer end face facing in the opposite direction to the inner end face; a bottom surface extending in the direction connecting the inner end face and the outer end face, and facing towards the mounting surface; a top surface extending in the direction connecting the inner end face and the outer end face, and facing in the opposite direction to the bottom surface; and a first side surface and a second side surface extending in the direction connecting the inner end face and the outer end face, adjacent to the bottom surface, the top surface, the inner end face, and the outer end face, and facing in opposite directions to each other.

[0011] The coil component further comprises: at least one first terminal electrode disposed on the bottom surface of the first flange portion; at least one second terminal electrode disposed on the bottom surface of the second flange portion; at least one wire wound into a core portion and connected between the first terminal electrode and the second terminal electrode; and a cover component configured to cover the core from the top surface of the first flange portion to the top surface of the second flange portion.

[0012] Furthermore, in order to solve the aforementioned technical problems, the cover component is characterized by comprising a UV-curable resin and a filler composed of flat particles having a long axis and a short axis.

[0013] According to the present invention, the filler included in the cover member functions to ensure a specified thickness within the cover member. Therefore, the specified thickness can also be sufficiently ensured for the thickness of the cover member on the respective top surfaces of the first flange and the second flange.

[0014] As a result, by providing a cover member with sufficient thickness on the top surfaces of the first and second flanges, cracks can be suppressed in the portion of the wire covering the wound core within the cover member even when large compressive stresses are applied during thermal shock testing. This is presumably because the increased volume of the cover member on the top surfaces of the first and second flanges suppresses stress at the interface between the flanges and the cover member.

[0015] Furthermore, according to the present invention, the filler included in the cover component is composed of flattened particles, thus the filler is easily positioned such that the extension direction of its long axis is parallel or substantially parallel to the extension direction of the top surface of the flange. Therefore, the filler easily functions to suppress the shrinkage of the cover component along the top surface of the flange.

[0016] In addition, the cover components are made of UV-curable resin, which allows for efficient curing processes. Attached Figure Description

[0017] Figure 1 This is a diagram showing the coil component 1 according to the first embodiment of the present invention. Figure 1 (A) is the front view. Figure 1 (B) is the right view.

[0018] Figure 2 It is equivalent to Figure 1 The diagram shown depicts the electron beam image traced by a cross-section of the imaging cover component 25 along a surface that passes through the central axis of the core portion 3 and is orthogonal to the top surface 17 of the flange portion 5 in the embodiment of the coil component 1 shown.

[0019] Figure 3 It means Figure 1 A front view of the forming process of the cover component 25 included in the manufacturing method of the coil component 1 shown.

[0020] Figure 4 This is a cross-sectional view showing a portion of the coil component 1a according to the second embodiment of the present invention, specifically the portion where the cover component 25 covers the top surface 17 of the flange portion 5.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1, 1a…coil component; 2…core; 3…winding core; 4, 5…flange; 7, 8…terminal electrode; 9…wire; 11, 12…inner end face; 13, 14…outer end face; 15, 16…bottom surface; 17, 18…top surface; 19, 20…first side surface; 21, 22…second side surface; 25…cover component; 26…ultraviolet curable resin; 27…filler. Detailed Implementation

[0023] Reference Figure 1 The coil component 1 of the first embodiment of the present invention will be described.

[0024] The coil component 1 includes a core 2. The core 2 has: a winding core portion 3 extending along an axial direction AX; and a first flange portion 5 and a second flange portion 6, respectively disposed at a first end and a second end of the winding core portion 3 opposite to each other in the axial direction AX. The core 2 is integrally formed into a quadrangular prism shape, for example, with a dimension of 0.5mm to 2.6mm in the axial direction AX, a dimension of 0.4mm to 2.0mm in the height direction, and a dimension of 0.3mm to 2.3mm in the width direction. As an example, the core 2 has a dimension of 1.6mm in the axial direction AX, a dimension of 0.85mm in the height direction, and a dimension of 0.8mm in the width direction.

[0025] The core 2 is composed of, for example, non-magnetic materials such as insulating ceramics like alumina; magnetic materials such as nickel (Ni)-zinc (Zn) ferrites and manganese (Mn)-Zn ferrites; or metallic magnetic materials. The core 2 is obtained by sintering a molded body obtained by compressing powders of the above materials. Alternatively, the core 2 can be obtained by molding a resin containing magnetic powder.

[0026] A first terminal electrode 7 is provided on the bottom surface 15 of the first flange portion 5 facing the mounting surface. A second terminal electrode 8 is provided on the bottom surface 16 of the second flange portion 6 facing the mounting surface.

[0027] For example, terminal electrodes 7 and 8 are formed by sintering a conductive paste containing glass powder and silver as a conductive component, and Ni, Cu, Sn, etc. are plated onto the terminal electrodes 7 and 8 as needed. Terminal electrodes 7 and 8 can also be provided by bonding separately prepared metal terminal components to the flange portions 5 and 6.

[0028] The winding core 3 has a wire 9 wound around it. Although not shown, the wire 9 consists of a core wire and a sheathing material. The core wire is made of a conductive metal material such as Cu or Ag, and the sheathing material covers the core wire and is made of an electrically insulating resin material, such as polyurethane, polyester, polyimide, polyamide, or a mixture of these substances. The diameter of the wire 9, including the core wire and the sheathing material, is preferably 16 μm or more and 110 μm or less.

[0029] One end of the wire 9 is connected to the first terminal electrode 7, and the other end of the wire 9 is connected to the second terminal electrode 8. For the connection between the wire 9 and each of the terminal electrodes 7 and 8, heat pressing is preferred. Alternatively, welding, fusion welding, etc., can be used instead of heat pressing.

[0030] The first flange portion 5 described above has: an inner end face 11 located at the first end of the core portion 3; an outer end face 12 facing in the opposite direction to the inner end face 11; a bottom surface 15 extending in the direction connecting the inner end face 11 and the outer end face 12 and facing the mounting surface side; a top surface 17 extending in the direction connecting the inner end face 11 and the outer end face 12 and facing in the opposite direction to the bottom surface 15; and a first side surface 19 and a second side surface 21 extending in the direction connecting the inner end face 11 and the outer end face 12, adjacent to the bottom surface 15, the top surface 17, the inner end face 11, and the outer end face 13 respectively, and facing in opposite directions to each other.

[0031] The second flange portion 6 has: an inner end face 12 located at the second end of the core portion 3; an outer end face 14 facing in the opposite direction to the inner end face 12; a bottom surface 16 extending in the direction connecting the inner end face 12 and the outer end face 14 and facing the mounting surface side; a top surface 18 extending in the direction connecting the inner end face 12 and the outer end face 14 and facing in the opposite direction to the bottom surface 16; and a first side surface 20 and a second side surface 22 extending in the direction connecting the inner end face 12 and the outer end face 14, adjacent to the bottom surface 16, the top surface 18, the inner end face 12, and the outer end face 14, and facing in opposite directions to each other.

[0032] The coil component 1 also includes a cover component 25, which is configured to cover the core 2 from the top surface 17 of the first flange portion 5 to the top surface 18 of the second flange portion 6. The cover component 25 is preferably configured to cover not only the top surfaces 17 and 18, but also the portions of the inner end surfaces 11 and 12, the outer end surfaces 13 and 14, the first side surfaces 19 and 20, and the second side surfaces 21 and 22 that are partially adjacent to the top surfaces 17 and 18. The cover component 25 may include, for example, an epoxy, acrylic, polyurethane, or silicone-based UV-curable resin; and a filler composed of flattened particles.

[0033] Figure 2 It is equivalent to Figure 1 This diagram is obtained by tracing and depicting an electron beam image formed by photographing a cross-section of the cover member 25 formed on the top surface 17 of the first flange portion 5 of the core 2 in the embodiment of the coil component 1 shown. Figure 2 The diagram shows that the cover component 25 includes a UV-curable resin 26 and a filler 27.

[0034] like Figure 2 As shown, the filler 27 is composed of flattened particles. With the longest direction as the major axis, each flattened particle has a major axis and a minor axis in a direction orthogonal to the major axis and shorter than the major axis. The flattened particles are particles with an average aspect ratio a / b of 2.0 or more and 30 or less, defined by the ratio of the major diameter a to the minor diameter b. It is capable of, for example... Figure 2 In the cross-section, using a SEM (SUI510) at a magnification of ×320, the aspect ratio is determined by averaging the values ​​obtained from at least 10 fillers 27. The flattened particles can be, for example, needle-shaped particles (with X as the major axis and YZ as the minor axis in the XYZ axis) or plate-shaped particles (with XY as the major axis and Z as the minor axis in the XYZ axis). As filler 27, inorganic particles such as talc particles, silica particles, and zirconia particles can be used, but talc particles are particularly preferred.

[0035] Talc is derived from Mg3Si4O 10The material is a magnesium silicate mineral with (OH)₂ as its main component, and the talc particles are obtained by crushing this silicate mineral. When crushing the silicate mineral, talc particles with a flattened morphology are usually obtained. Furthermore, the talc particles have minute irregularities on their surface, thus enabling good bonding performance with the UV-curable resin 26. However, the talc particles obtained from crushing the silicate mineral sometimes contain impurities.

[0036] Next, refer to Figure 3 The forming process of the cover 25 will be explained. After explaining the forming process of the cover component 25, please refer again to the above. Figure 2 .

[0037] exist Figure 3 (1) illustrates a state where the coil component 1 already possesses the elements (uncured resin liquid 30) that should become the cover component 25. However, firstly, the core 2, after being wound with the wire 9 and before forming the cover component 25, is bonded and held in a state where the terminal electrodes 7 and 8 face the adhesive sheet 29. Secondly, a resin bath 31 is prepared, containing uncured resin liquid 30, which is an uncured UV-curable resin 26 and filler 27, that will become the cover component 25, with a constant thickness.

[0038] Next, core 2 is immersed in resin bath 31 from the side opposite to terminal electrodes 7 and 8. Then, as shown by arrow 32, core 2 is pulled out of resin bath 31. The state during this stage is as follows: Figure 3 As shown in (1). In Figure 3 In (1), an uncured resin liquid 30 constituting the resin bath 31 is coated on the side of the core 2 opposite to the side of the terminal electrodes 7 and 8. The uncured resin liquid 30 covers the core 2 from the top surface 17 of the first flange portion 5 to the top surface 18 of the second flange portion 6.

[0039] Next, as Figure 3 As shown in (2), the core 2 is held in place of the adhesive sheet 29 as before, and the side coated with the uncured resin liquid 30, that is, the top surfaces 17 and 18 of the flanges 5 and 6, are pressed by the abutment sheet 33. During this stage, the filler 27 in the uncured resin liquid 30 tends to move in a direction that is parallel or substantially parallel to the extension direction of the top surfaces 17 and 18.

[0040] Furthermore, the top surfaces 17 and 18 of the flanges 5 and 6 are not limited to being planar in their entirety. For example, if the core 2 is tumbled, a chamfer (R-shape) is applied to the periphery of the top surfaces 17 and 18. In this case, the top surfaces 17 and 18 should be understood as surfaces parallel to the axial direction AX of the core 3. Therefore, as described above, "top surfaces 17 and 18" in "the filler 27 operates in a manner that the extension direction of the long axis is parallel or substantially parallel to the extension direction of the top surfaces 17 and 18" is understood as surfaces parallel to the axial direction AX.

[0041] Furthermore, if talc particles are used as filler 27, the flatness of the surface of the cover component 25 can be easily achieved by pressing the abutment piece 33, since talc particles are flat and more brittle than other materials. The filler 27 made of talc particles also has the advantage of not easily damaging the core 2.

[0042] The aforementioned abutment sheet 33 is preferably transparent so that it can transmit ultraviolet light. Therefore, the abutment sheet 33 is, for example, made of polyethylene terephthalate.

[0043] Next, as described above, while maintaining the state where the side of the core 2 coated with the uncured resin liquid 30 is pressed by the abutment piece 33, ultraviolet light 34 is irradiated through the abutment piece 33 onto the uncured resin liquid 30. As a result, the ultraviolet-curable resin 26 contained in the uncured resin liquid 30 cures, thus... Figure 2 The cover component 25, comprising UV-curable resin 26 and filler 27, is formed as shown.

[0044] Furthermore, while using a UV-curable resin in the cover component 25 achieves excellent mass production performance, the presence of fillers would block UV transmission, thus fillers have historically been avoided. However, as in this embodiment, it has been found that if the cover component 25 contains filler 27, the thickness of the cover component 25 on the top surfaces 17 and 18 of the flange portions 5 and 6 can be reliably ensured, and crack formation can be suppressed. On the other hand, even if a certain amount of filler 27 is mixed in, it will not hinder the curing of the UV-curable resin 26 caused by UV light.

[0045] As mentioned above, by pressing on the abutment piece 33, according to Figure 2 It can be seen that the long axis of most of the packing 27 contained in the portion of the cover component 25 covering the top surfaces 17 and 18 of the flange portions 5 and 6 extends in a direction parallel or substantially parallel to the extension direction of the top surface 17. Therefore, the packing 27 effectively suppresses the contraction of the cover component 25 along the top surfaces 17 and 18 of the flange portions 5 and 6.

[0046] On the other hand, the portion of the cover core 3 in the cover component 25 is not directly subjected to pressing based on the aforementioned abutment piece 33, so the filler 27 contained in this portion is mostly oriented with its long axis in a random direction.

[0047] The particle size of the filler 27 included in the cover component 25 is preferably 1 μm or more and 30 μm or less, more preferably 5 μm or more and 30 μm or less, in terms of D50. If the particle size of the filler 27 is selected from such a range, the cover component 25 can more reliably reduce stress and suppress crack formation during thermal shock. In addition, the particle size of the filler 27 being 30 μm or less in terms of D50 also avoids unnecessary large-scale product size. Furthermore, the particle size of the filler 27 can be determined by light scattering, but the particle size of the filler 27 in the stage before the formation of the cover component 25 is also largely maintained after the formation of the cover component 25. This can be confirmed by, for example, by using a SEM (SUI510) at a magnification of ×320, averaging the particle size values ​​obtained from at least 10 fillers 27 to determine the particle size of the filler 27.

[0048] In addition, such as Figure 2 As shown, the filler 27 preferably comprises filler that contacts the top surfaces 17 and 18. Similarly, the filler 27 is preferably comprised in the portion of the cover member 25 that covers the top surfaces 17 and 18 and is exposed on the surface of the cover member 25. This configuration allows for efficient heat dissipation from the core 2 to the outside.

[0049] Regarding the content ratio of filler 27 in cover component 25, in the plane CC of cover component 25 along the central axis passing through core portion 3 and orthogonal to top surfaces 17 and 18 (refer to...) Figure 1 In the cross-section of (B), the filler 27 contained in the portion of the top surface 17, 18 of the cover component 25 preferably has an area ratio of 15.0% or more and 50.1% or less. That is, in Figure 2 In the cross-section of the cover member 25 shown, if the ratio of the cross-sectional area of ​​the filler 27 to the cross-sectional area of ​​the portion covering the top surfaces 17 and 18 in the cover member 25 is defined as the area ratio, then the filler 27 preferably has an area ratio of 15.0% or more and 50.1% or less. This area ratio can be achieved by controlling the pressing pressure formed by the aforementioned abutment piece 33.

[0050] As described above, if the filler 27 contained in the portion of the top surface 17, 18 of the cover component 25 has an area ratio of 15.0% or more, it can provide a reference for the uncured resin liquid 30. Figure 3(1) The viscosity and rheological properties of the uncured resin liquid 30 are easily handled in the coating process. In addition, it can suppress the compressive stress in the cover component 25 during reliability testing, thereby reliably suppressing the propagation of micro-cracks. In addition, it can suppress the thickness difference at the portion of the cover component 25 covering the top surfaces 17 and 18 and reliably ensure the specified thickness.

[0051] On the other hand, if the filler 27 contained in the portion of the top surface 17, 18 of the cover component 25 has an area ratio of 50.1% or less, the curing properties of the UV-curable resin 26 can be good, thereby enabling the UV-curable resin 26 to be cured with a relatively low cumulative light intensity. Additionally, a reference can be provided for the uncured resin liquid 30. Figure 3 (1) The viscosity and rheological properties of the uncured resin liquid 30 that are easy to handle in the coating process are described.

[0052] In the cross-section of the cover member 25 along the plane CC that passes through the central axis of the core portion 3 and is orthogonal to the top surface, the area ratio of the filler 27 contained in the portion of the cover member 25 covering the top surfaces 17 and 18 is preferably greater than the area ratio of the filler 27 contained in the portion of the cover member 25 covering the core portion 3. This area ratio relationship is achieved because the pressing action formed by the aforementioned abutment piece 33 directly affects the portions of the cover member 25 covering the top surfaces 17 and 18, but does not directly affect the portions covering the core portion 3.

[0053] As described above, the area ratio of filler 27 contained in the portion covering the top surfaces 17 and 18 is greater than the area ratio of filler 27 contained in the portion covering the core portion 3. In other words, the area ratio of filler 27 contained in the portion covering the core portion 3 is less than the area ratio of filler 27 contained in the portion covering the top surfaces 17 and 18. This means that in the portion covering the core portion 3 where the thickness of the cover member 25 becomes thicker, a structure that allows for easier transmission of ultraviolet light can be achieved, thereby enabling sufficient curing of the ultraviolet-curable resin 26 in the portion covering the core portion 3.

[0054] Next, samples were manufactured with various variations in the area ratio of filler 27 contained in the portions covering the top surfaces 17 and 18 of the cover component 25, and the differences in thickness of the cover component 25 at these portions, the presence or absence of cracks, and the coating performance of the uncured resin liquid 30 were evaluated. The results are shown in Table 1 below.

[0055] Table 1 (see next page)

[0056]

[0057] In Table 1, the "filler area ratio" was determined using a SEM (SUI510) under the following conditions: accelerating voltage: 15kV, magnification: ×320, and detector current: 60mA.

[0058] For “thickness difference of cover components”, the cross-section of the sample is observed using a microscope that can measure dimensions, and it is determined whether it is “good (◎)” or “acceptable (○)”.

[0059] To determine whether a crack is present or absent, observe the surface of the cover component in the sample after a thermal shock test (500 cycles of -155℃ to +125℃) to determine whether it is present or absent.

[0060] Regarding "coating performance", observe whether the amount of uncured resin coated on the sample is appropriate, and determine whether it is "good (◎)" or "acceptable (○)". If the amount of filler in the uncured resin liquid increases, the viscosity of the uncured resin liquid will increase, and too much uncured resin liquid will be coated when the core is pulled out of the resin bath.

[0061] As shown in Table 1, samples 2 to 9 with a "filler area ratio" of 15.0% or more and 50.1% or less can obtain the best results in each item of "cover component thickness difference", "presence or absence of cracks" and "coating performance".

[0062] On the other hand, in sample 1, where the "filler area ratio" was less than 15.0%, the evaluation for "cover component thickness difference" was acceptable (○). In addition, in sample 10, where the "filler area ratio" was greater than 50.1%, the evaluation for "coating performance" was acceptable (○).

[0063] exist Figure 4 The cross-sectional view shows a portion of the coil component 1a according to the second embodiment of the present invention, specifically the portion where the cover component 25 covers the top surface 17 of the flange portion 5. Figure 4 In China, for the sake of Figure 1 The components shown are labeled with the same reference numerals as those in the accompanying drawings, and repeated descriptions are omitted.

[0064] Figure 4 The coil component 1a shown is characterized by a slope on the inner end face 11 of the flange portion 5 of the core 2. The cover component 25 has a wall thickness portion 37 on the inner end face 11 of the flange portion 5 on the side near the core portion 3. Therefore, according to the coil component 1a, compared with the coil component 1 of the first embodiment, stress is less likely to concentrate in the portion of the cover component 25 corresponding to the boundary between the flange portion 5 and the core portion 3, thereby making it less prone to cracking.

[0065] The above description is in connection with the embodiments of the present invention illustrated, but the illustrated embodiments are illustrative embodiments and various modifications can be made within the scope of the present invention.

[0066] For example, in addition to components that constitute a single coil, the coil component can also be composed of multiple coils such as a pulse transformer or a common-mode choke. Therefore, the number of wires is arbitrary, and correspondingly, the number of terminal electrodes provided on each flange is also arbitrary.

Claims

1. A coil component, wherein, The coil component includes a core, the core comprising: a winding core portion extending along an axial direction; and a first flange portion and a second flange portion respectively disposed at a first end and a second end of the winding core portion opposite to each other in the axial direction. The first flange portion and the second flange portion each have: an inner end face located at the first end and the second end of the winding core portion, respectively; an outer end face facing in the opposite direction to the inner end face; a bottom surface extending in the direction connecting the inner end face and the outer end face, and facing the mounting surface side; a top surface extending in the direction connecting the inner end face and the outer end face, and facing in the opposite direction to the bottom surface; and a first side surface and a second side surface extending in the direction connecting the inner end face and the outer end face, adjacent to the bottom surface, the top surface, the inner end face, and the outer end face, and facing in opposite directions to each other. The coil component also includes: At least one first terminal electrode is disposed on the bottom surface of the first flange portion; At least one second terminal electrode is disposed on the bottom surface of the second flange portion; At least one wire is wound around the core portion and connected between the first terminal electrode and the second terminal electrode; as well as A cover component is configured to cover the core from the top surface of the first flange to the top surface of the second flange. The cover component comprises a UV-curable resin and a filler consisting of flattened particles having a long axis and a short axis. In a cross-section of the cover member along a plane passing through the central axis of the core and orthogonal to the top surface, the area ratio of the filler contained in the portion of the cover member covering the top surface is greater than the area ratio of the filler contained in the portion of the cover member covering the core.

2. The coil component according to claim 1, wherein, The filler contains talc particles.

3. The coil component according to claim 1 or 2, wherein, The filler included in the portion of the cover component that covers the top surface includes filler that oriented the extension direction of the long axis in a direction parallel or substantially parallel to the extension direction of the top surface.

4. The coil component according to claim 1 or 2, wherein, The filler contained in the portion of the cover component that covers the core portion causes the long axis to oriented in a random direction.

5. The coil component according to claim 1 or 2, wherein, In a cross-section of the cover member along a plane passing through the central axis of the core portion and orthogonal to the top surface, the filler contained in the portion of the cover member covering the top surface has an area ratio of 15.0% or more and 50.1% or less.

6. The coil component according to claim 1 or 2, wherein, The particle size of the filler, measured in D50, is greater than 1 μm and less than 30 μm.

7. The coil component according to claim 1 or 2, wherein, The packing material includes packing material that contacts the top surface.

8. The coil component according to claim 1 or 2, wherein, The filler is contained in the portion of the cover component that covers the top surface and is exposed on the surface of the cover component.

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