Coil components

Abstract

The present invention provides a core body in a coil component, in which the area where a wire can be wound around the circumference of a winding core portion is not damaged and is not prone to mechanical damage. A recess (45) is provided by implementing groove-shaped chamfering along the ridges (46-48) of a substantially quadrangular prism-shaped winding core portion (23). A slope surface (50) is provided in the recess (45), and the slope surface is inclined at an obtuse angle relative to each of the inner end surfaces (26) and (27) of the flange portions (24) and (25), and extends in a direction away from each of the inner end surfaces (26) and (27). The slope surface (50) helps to improve the mechanical strength of the core body (22). The end of the slope surface (50) on the inner end surface (26) and (27) side is preferably located at the same position as the circumferential surface (41) or at a position closer to the center axis than the circumferential surface (41) in the direction from the circumferential surface (41) side toward the center axis side of the winding core portion (23).

Description

Technical Field

[0001] The present invention relates to a coil component, and more particularly to a winding type coil component having a core body having a winding core portion around which a wire material is wound and flange portions provided at respective ends of the winding core portion. Background Art

[0002] The winding type coil component generally includes a core body having a winding core portion and flange portions respectively provided at each end of the winding core portion. Fig.17 As shown, the core body is configured such that the axial direction of the winding core portion extends parallel to the mounting surface.

[0003] exist Fig.17 In the figure, the core 2 of the coil component mounted on the mounting substrate 1 is shown in a cross section perpendicular to the mounting surface 7 of the mounting substrate 1. The core 2 is made of, for example, alumina or ferrite, and has a winding core 3 and flanges 4 and 5 respectively provided at each end of the winding core 3. The coil component is mounted on the mounting substrate 1 by welding. At this time, the core 2 is configured so that the direction of the axis 6 of the winding core 3 extends parallel to the mounting surface 7 of the mounting substrate 1.

[0004] In the above state, due to thermal expansion and thermal contraction caused by temperature changes, when a certain force is applied to the mounting substrate 1, the mounting substrate 1 tends to deform. In the case where the mechanical strength of the core 2 is insufficient, the deformation of the mounting substrate 1 results in, for example, Fig.17 As shown schematically, mechanical damage such as crack 8 may occur. As shown in the figure, the crack 8 is usually formed between the winding core 3 and the flange 4 or 5 (at Fig.17 The boundary of the flange portion 5) is the starting point.

[0005] On the other hand, for example, in Japanese Patent Publication No. 2018-198234 (Patent Document 1), it is described that Figure 1 to Figure 3 In the embodiment, a core body having a sloped surface is provided at the boundary between the core and each flange. More specifically, the sloped surface is provided over the entire circumference of the portion where the circumferential surface of the core intersects with the inner end surface of each flange facing the core, and extends at an obtuse angle to the inner end surface of the flange. With such a sloped surface, the stress generated at the boundary between the core and the flange can be alleviated, so that it is expected that the stress is not likely to be generated. Fig.17 The effect of crack 8 is shown.

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-198234

[0007] exist Fig.18, a portion of the core 10 provided with the above-mentioned sloped surface 9 is shown in an enlarged manner. The sloped surface 9 is provided over the entire circumference of the portion where the circumferential surface 12 of the winding core 11 intersects with the inner end surface 14 of the flange 13 facing the winding core 11. The sloped surface 9 extends at an obtuse angle to the inner end surface 14 of the flange 13.

[0008] If we only focus on preventing Fig.17 From the perspective of preventing the occurrence of the crack 8 shown in FIG. 1 , it is known that the slope surface 9 preferably extends over a longer range from the inner end surface 14 of the flange portion 13 to the peripheral surface 12 of the winding core portion 11. Fig.18 As shown, the wire 15 wound around the peripheral surface 12 of the winding core 11 easily slides off the slope surface 9, so it is not easy to wind the wire 15 on the slope surface 9. Therefore, a relatively wide gap 16 is generated between the turn of the wound wire 15 closest to the flange portion 13 and the inner end surface 14 of the flange portion 13.

[0009] As a result, the gap 16 becomes wider as the slope surface 9 extends over a longer range, and as a result, the area where the wire 15 can be safely wound around the peripheral surface 12 of the winding core 11 is further reduced. This makes it difficult to achieve both miniaturization of the coil component and sufficient inductance. Summary of the invention

[0010] Therefore, an object of the present invention is to provide a coil component that can prevent mechanical damage such as cracks from occurring even if a slope surface is provided only in a short range at the intersection of the circumferential surface of the winding core portion and the inner end surface of the flange portion, or even if a slope surface is not provided.

[0011] The present invention relates to a coil component, which comprises: a core body having a winding core portion and a flange portion, the winding core portion having a circumferential surface and extending along an axial direction, the flange portions being respectively arranged at mutually opposite ends in the axial direction of the winding core portion, and the core body being configured so that the axial direction of the winding core portion extends parallel to a mounting surface; terminal electrodes being arranged on at least the mounting surface side of each flange portion; and a wire material being wound around the circumferential surface of the winding core portion and connected to the terminal electrodes.

[0012] Each of the flanges has an inner end surface facing the winding core and on which the ends of the winding core are placed, and an outer end surface facing outward on the opposite side of the inner end surface.

[0013] In order to solve the above technical problems, the present invention is characterized by having the following structure. That is, a concave portion is provided in a portion of the circumferential direction on the side of the winding core portion where the circumferential surface of the winding core portion and the inner end surface of each flange portion intersect. Furthermore, a slope surface is provided in the concave portion, the slope surface is inclined at an obtuse angle with respect to the inner end surface, and extends in a direction away from the inner end surface.

[0014] According to the present invention, the sloped surface contributes to improving the mechanical strength of the core body. Therefore, even if the mounting substrate is deformed when the coil component is mounted, the core body is less likely to be mechanically damaged such as cracks.

[0015] In addition, since the sloped surface is provided in the recessed portion, all or most of the sloped surface can be accommodated in the space defined by the recessed portion. In addition, the recessed portion is located on the side of the winding core portion where the circumferential surface of the winding core portion and the inner end surface of each flange portion intersect, but is provided only in a part of the circumferential direction. Therefore, it is possible to substantially avoid the sloped surface becoming an obstacle when the wire is wound around the circumferential surface of the winding core portion.

[0016] Therefore, a sufficient area around which the wire can be wound can be ensured on the peripheral surface of the winding core portion, so that the coil component can be miniaturized and a sufficient inductance value can be ensured.

[0017] In addition, since all or most of the slope surface can be accommodated in the space defined by the recess, even if the slope surface is long, the slope surface can be prevented or almost prevented from affecting the area for winding the wire. Therefore, by making the slope surface longer, the mechanical strength of the core can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 1 is a perspective view showing the appearance of a coil component 21 according to the first embodiment of the present invention. The coil component 21 is shown in the figure with the surface facing the mounting surface side facing upward.

[0019] Figure 2 Yes means Figure 1 The core 22 of the coil component 21 shown in FIG. Figure 1 The posture in.

[0020] Figure 3 yes Figure 2 The core 22 shown is Figure 1 Top view when observing in the pose.

[0021] Figure 4 yes Figure 2 The core 22 shown is Figure 1 The front view when observing in the pose.

[0022] Figure 5 It is along Figure 3 A cross-sectional view along line VV of .

[0023] Figure 6 It is along Figure 3 A cross-sectional view taken along line VI-VI.

[0024] Figure 7 yes Figure 3An enlarged view of part VII.

[0025] Figure 8 yes Figure 4 An enlarged view of section VIII.

[0026] Fig. 9 yes Figure 2 Magnified view of section IX.

[0027] Fig.10 is with Fig.18 The corresponding drawings show the core body 22 and the wire 42 wound around the winding core 23 .

[0028] Fig.11 The figure shows the appearance of the core 22a provided in the coil component according to the second embodiment of the present invention. Figure 1 The corresponding figure.

[0029] Fig.12 Yes means Fig.11 The portion of the core 22a shown is Figure 8 The corresponding enlarged image.

[0030] Fig.13 The figure shows the appearance of the core 22b included in the coil component according to the third embodiment of the present invention. Figure 1 The corresponding figure.

[0031] Fig.14 Yes means Fig.13 The portion of the core 22b shown is Figure 8 The corresponding enlarged image.

[0032] Fig.15 The figure shows the appearance of the core 22c included in the coil component according to the fourth embodiment of the present invention. Figure 1 The corresponding figure.

[0033] Fig.16 Yes means Fig.15 The portion of the core 22c shown is Figure 8 The corresponding enlarged image.

[0034] Fig.17 It is a cross-sectional view schematically showing the core 2 and the mounting substrate 1 in which a crack 8 has occurred.

[0035] Fig.18 is with Fig.10 The corresponding drawings show a core body 10 included in the coil component described in Patent Document 1 and a wire 15 wound around a winding core 11 .

[0036] Description of Reference Numerals

[0037] 21…coil component; 22, 22a, 22b, 22c…core body; 23…winding core portion; 24, 25…flange portion; 26, 27…inner end surface; 28, 29…outer end surface; 38, 39…terminal electrode; 40…axis line; 41…circumferential surface; 42…wire material; 45…recess; 46-49…ridgeline; 50…slope surface; 50a…first slope surface; 50b…second slope surface; 51…end portion of the slope surface 50 on the side of the circumferential surface 41; 52…boundary between the first slope surface 50a and the second slope surface 50b. DETAILED DESCRIPTION

[0038] [First embodiment]

[0039] Reference Figures 1 to 10 , a coil component 21 according to a first embodiment of the present invention will be described.

[0040] like Figure 1 As shown, the coil component 21 is a winding type, and has a substantially drum-shaped core 22. The core 22 is Figure 2 to Figure 6 The core 22 is made of a non-conductive material such as alumina or ferrite, and includes a winding core 23 , and a first flange 24 and a second flange 25 provided at opposite ends of the winding core 23 .

[0041] The first flange portion 24 has an inner end face 26 facing the side of the winding core portion 23 and on which the end of the winding core portion 23 is placed, and an outer end face 28 facing the outer side of the opposite side of the inner end face 26. It also has a bottom surface 30 facing the mounting substrate (not shown) side during installation, a top surface 32 on the opposite side of the bottom surface 30, a first side surface 34, and a second side surface 36 on the opposite side of the first side surface 34.

[0042] The second flange portion 25 has an inner end face 27 facing the winding core portion 23 and where the end of the winding core portion 23 is located, and an outer end face 29 facing the outer side of the opposite side of the inner end face 27. It also has a bottom surface 31 facing the mounting substrate (not shown) side during installation, a top surface 33 on the opposite side of the bottom surface 31, a first side surface 35, and a second side surface 37 on the opposite side of the first side surface 35.

[0043] A first terminal electrode 38 is provided on the mounting surface side of the first flange portion 24, and a second terminal electrode 39 is provided on the mounting surface side of the second flange portion 25. More specifically, the first terminal electrode 38 is provided to cover the bottom surface 30 of the first flange portion 24 and to extend to a portion of each of the inner end surface 26, the outer end surface 28, the first side surface 34, and the second side surface 36. The second terminal electrode 39 is provided to cover the bottom surface 31 of the second flange portion 25 and to extend to a portion of each of the inner end surface 27, the outer end surface 29, the first side surface 35, and the second side surface 37.

[0044] The terminal electrodes 38 and 39 are formed, for example, by sintering a conductive paste containing Ag as a conductive component, and Ni plating and Sn plating are sequentially performed thereon as required. The sintered layer can also be formed using a conductive paste containing Cu as a conductive component instead of Ag. In addition, the plated film formed thereon can also be formed in the order of Cu / Ni / Sn plating or Ni / Cu / Sn plating. In addition, there is also a case where a Pd / Au plated film is formed on the outermost layer.

[0045] The terminal electrodes 38 and 39 are made of, for example, metal plates, and thus may be replaced with terminal members bonded to the flange portions 24 and 25 .

[0046] The coil component 21 is mounted by soldering the terminal electrodes 38 and 39 to the mounting substrate. At this time, the core 22 is arranged so that the axis 40 of the winding core portion 23 (see Figure 3 and Figure 4 ) direction extends parallel to the mounting surface. Although the mounting substrate having the mounting surface is not shown, the mounting surface extends parallel to a surface that includes the bottom surfaces 30 and 31 of the first flange portion 24 and the second flange portion 25, respectively.

[0047] The coil component 21 further includes a wire 42 wound around the peripheral surface 41 of the winding core 23. The wire 42 constitutes an inductor, so the first end 43 and the second end 44 thereof are connected to the first terminal electrode 38 and the second terminal electrode 39, respectively. This connection is achieved by, for example, thermocompression bonding. Figure 1 In FIG. 1 , the middle portion in the longitudinal direction of the wire 42 located around the peripheral surface 41 of the winding core portion 23 is omitted from illustration.

[0048] Hereinafter, the characteristic structure of this embodiment will be described.

[0049] On the winding core 23 side of the portion where the peripheral surface 41 of the winding core 23 intersects with the inner end surfaces 26 and 27 of the first flange 24 and the second flange 25, in the circumferential direction C (refer to Figure 6 ) is provided with a recess 45 in a portion. In the present embodiment, the winding core 23 is substantially a polygonal column having a plurality of ridges extending in parallel to each other, more specifically, a quadrangular column having four ridges 46 to 49 extending in parallel to each other, and the recess 45 is formed by a chamfer provided on each of the ridges 46 to 49. The chamfer is provided on all four ridges 46 to 49. The chamfer forms grooves extending along each of the ridges 46 to 49, and these grooves are as follows. Figure 6 and Fig. 9 As shown, it is defined by a concave surface having a substantially L-shaped cross section. In addition, the chamfers forming the concave portion 45 are provided along the entire length of each of the ridge lines 46 to 49.

[0050] A slope surface 50 is provided in the recessed portion 45. The slope surface 50 forms an obtuse angle θ (see FIG. 1 ) with respect to each of the inner end surfaces 26 and 27 of the first flange portion 24 and the second flange portion 25. Figure 8 ) and extends in a direction away from each of the inner end surfaces 26 and 27. In the present embodiment, the slope surface 50 is substantially entirely formed of a flat surface. The slope surface 50 may also include a concave arc surface.

[0051] The sloped surface 50 helps to improve the mechanical strength of the core 22, thereby relieving the stress generated at the boundary between the winding core 23 and each flange 24 and 25, thereby making it less likely to generate Fig.17 When viewed from a direction perpendicular to the axis 40 of the winding core 23 and parallel to the mounting surface, that is, from Figure 8 When viewed in the direction shown, the slope surface 50 is inclined at an obtuse angle θ relative to each of the inner end surfaces 26 and 27, and extends in a direction away from each of the inner end surfaces 26 and 27. If the slope surface 50 satisfies this condition, the recessed portion 45 provided with the slope surface 50 may be arranged at least on the side of the peripheral surface 41 of the winding core portion 23 opposite to the mounting surface.

[0052] However, it is preferred that the recessed portion 45 having the sloped surface 50 is provided on both the side opposite to the mounting surface and the side opposite to the side opposite to the mounting surface of the peripheral surface 41 of the winding core portion 23, as in the illustrated embodiment. Thus, when manufacturing the coil component 21, it is not necessary to distinguish the directionality of the position where the terminal electrodes 38 and 39 should be formed relative to the core body 22, that is, it is not necessary to distinguish between the bottom surfaces 30 and 31 and the top surfaces 32 and 33 of the flange portions 24 and 25, so the burden of process management can be reduced and the manufacturing process can be efficiently performed.

[0053] In this embodiment, if Figure 8 and Fig. 9 As shown, the end 51 of one side of each inner end surface 26 and 27 of the slope surface 50 is located at the same position as the peripheral surface 41 in the direction from the peripheral surface 41 side of the winding core 23 toward the central axis side of the winding core 23, more specifically, in the direction orthogonal to the mounting surface. As a result, the slope surface 50 can be prevented from protruding from the peripheral surface 41. Similarly, the end 51 of one side of each inner end surface 26 and 27 of the slope surface 50 can also be located at a position closer to the central axis side than the peripheral surface 41 in the direction from the peripheral surface 41 side of the winding core 23 toward the central axis side of the winding core 23, that is, in the direction orthogonal to the mounting surface.

[0054] As described above, if the sloped surface 50 is prevented from protruding from the peripheral surface 41, the sloped surface 50 does not hinder the winding of the wire 42. In addition, the processing for obtaining the core body 22 is easy.

[0055] In addition, as long as the slope surface 50 does not hinder the winding of the wire 42, the end 51 on one side of each inner end surface 26 and 27 of the slope surface 50 can also be located in the direction from the circumferential surface 41 side of the winding core portion 23 toward the central axis side of the winding core portion 23, that is, in the direction orthogonal to the mounting surface, at a position on the side opposite to the central axis side than the circumferential surface 41.

[0056] In addition, in this embodiment, regarding the first flange portion 24 side, as shown in FIG. Fig.10 As shown schematically, the peripheral surface 41 of the winding core portion 23 directly intersects with each of the inner end surfaces 26 and 27 of the flange portions 24 and 25. That is, there is no slope surface at the boundary portion between the peripheral surface 41 of the winding core portion 23 and each of the inner end surfaces 26 and 27 of the flange portions 24 and 25. Therefore, in the extreme case, the wire 42 can be wound to a position in contact with the inner end surfaces 26 and 27 of the flange portions 24 and 25. Therefore, the number of turns of the wire 42 that can be wound around the winding core portion 23 of a limited size can be increased to a maximum, which can help to achieve both miniaturization of the coil component 21 and sufficient inductance value. In addition, in Figure 1 In the figure, the state in which the wire 42 is wound to a position in contact with the inner end surfaces 26 and 27 of the flange portions 24 and 25 is not clearly shown.

[0057] exist Fig.10 In addition, the dashed line indicates Fig.18 The circumferential surface 12 and the slope surface 9 of the winding core 11 are shown. Fig.10 As can be seen from the circumferential surface 41 indicated by the solid line and the circumferential surface 12 indicated by the dotted line, according to the coil component 21 of this embodiment, it is not necessary to Fig.18 Since the sloped surface 9 is provided as in the core 10 shown in the figure, it is possible to suppress a reduction in the volume of the core 22. This also contributes to ensuring a sufficient inductance value.

[0058] In the present embodiment, the sloped surface 50 is located at the ridges 46 to 49 of the substantially quadrangular prism-shaped winding core 23. According to the simulation results, the stress generated in the core 22 when the mounting substrate is deformed is concentrated at the corners of the boundaries between the winding core 23 and the flanges 24 and 25. Therefore, it can be said that the sloped surface 50 for helping to improve the mechanical strength of the core 22 only needs to be provided at the corners of the boundaries between the winding core 23 and the flanges 24 and 25, that is, at the ridges 46 to 49 of the substantially quadrangular prism-shaped winding core 23.

[0059] [Second Embodiment]

[0060] Reference Fig.11 and Fig.12 Next, a core 22 a included in a coil component according to a second embodiment of the present invention will be described. Fig.11 and Fig.12They are respectively Figure 2 and Figure 8 The corresponding figure. Fig.11 and Fig.12 In, with Figure 2 or Figure 8 Corresponding elements are denoted by the same reference numerals, and duplicate descriptions are omitted.

[0061] In the core 22a, a plurality of slope surfaces are provided in the recess 45. That is, the slope surface 50 includes at least a first slope surface 50a and a second slope surface 50b. The first slope surface 50a and the second slope surface 50b are connected in a direction away from each of the inner end surfaces 26 and 27 of the first flange portion 24 and the second flange portion 25 in sequence.

[0062] The first slope surface 50a and the second slope surface 50b are different from each other in at least one of the angle, curvature and length in the axial direction relative to each inner end surface 26 and 27. In the present embodiment, the curvature of the first slope surface 50a and the second slope surface 50b are different from each other. More specifically, the first slope surface 50a includes a concave arc surface, and the second slope surface 50b is composed of a substantially flat surface.

[0063] The boundary 52 between the first slope surface 50a and the second slope surface 50b is preferably located at the same position as the peripheral surface 41 or closer to the central axis side than the peripheral surface 41 in the direction from the peripheral surface 41 side of the winding core 23 toward the central axis side of the winding core 23, more specifically, in the direction orthogonal to the mounting surface. Thus, it is substantially possible to avoid the second slope surface 50b from becoming an obstacle when the wire is wound around the peripheral surface 41 of the winding core 23. In the illustrated form, the boundary 52 is located at the same position as the peripheral surface 41.

[0064] like Fig.11 As shown, the first slope surface 50a extends from the recess 45 to the entire circumference of the portion where the circumferential surface 41 of the winding core portion 23 intersects with the inner end surfaces 26 and 27 of the flange portions 24 and 25, respectively. This helps to further improve the mechanical strength of the core body 22a. This embodiment has the meaning of clearly indicating that the structure in which the slope surface is provided on the entire circumference or a part of the circumference of the portion where the circumferential surface of the winding core portion intersects with the inner end surface of the flange portion should not be excluded from the scope of the present invention.

[0065] In addition, as a comparative example with respect to the present embodiment, when compared with a case where the second slope surface 50b is not provided and only the first slope surface 50a is provided, according to the present embodiment, since the second slope surface 50b is provided in addition to the first slope surface 50a, the mechanical strength of the core 22a can be maintained even if the range in which the first slope surface 50a extends in the direction away from the inner end surfaces 26 and 27 is further shortened. Therefore, even when the second slope surface 50b is present, damage to the winding area of ​​the wire can be minimized.

[0066] In addition, the first slope surface 50a extending over the entire circumference of the winding core 23 is Fig.18 As with the case of the sloped surface 9 shown in the figure, there is a concern that the area where the wire can be wound around the peripheral surface 41 of the winding core 23 will be affected. Therefore, in the case where it is necessary to eliminate such a concern, it is preferable to select the shape and size of the first sloped surface 50a so that the outer peripheral surface of the wire can contact both the inner end surfaces 26 and 27 of the flanges 24 and 25 and the peripheral surface 41 of the winding core 23 at the same time. For example, Fig.12 As shown, when the first slope surface 50a includes an arc surface, it is preferred that the arc surface has a curvature radius that is the same as or shorter than the radius of the cross section of the wire material.

[0067] [Third Embodiment]

[0068] Reference Fig.13 and Fig.14 Next, a core 22 b included in a coil component according to a third embodiment of the present invention will be described. Fig.13 is with Figure 2 and Fig.11 The corresponding figure. Fig.14 is with Figure 8 and Fig.12 The corresponding figure. Fig.13 In, with Figure 2 or Fig.11 Elements corresponding to the elements shown in the figure are marked with the same reference numerals. Fig.14 In, with Figure 8 or Fig.12 Corresponding elements are denoted by the same reference numerals, and duplicate descriptions are omitted.

[0069] The core 22b has Fig.11 and Fig.12The core 22a shown in FIG. 4 has several common features. That is, in the core 22b, a first slope surface 50a and a second slope surface 50b are also provided in the recess 45. The first slope surface 50a includes a concave arc surface, and the second slope surface 50b is composed of a substantially flat surface. The boundary 52 between the first slope surface 50a and the second slope surface 50b is located at the same position as the peripheral surface 41 or at a position closer to the central axis than the peripheral surface 41 in the direction from the peripheral surface 41 side of the winding core 23 toward the central axis side of the winding core 23, that is, in the direction orthogonal to the mounting surface.

[0070] In this embodiment, if Fig.13 As shown, the first slope surface 50 a stops at the position where the recessed portion 45 is provided, rather than extending over the entire circumference of the winding core 23 .

[0071] On the other hand, in this embodiment, the depth dimension D of the recess 45 is smaller than Fig.12 The corresponding dimension of the recessed portion 45 shown is larger, and the dimension of the second slope surface 50b measured in the axial direction of the winding core 23 is larger than that of the second slope surface 50b. Fig.12 The corresponding dimension of the second slope surface 50b shown is larger. In addition, regarding the first slope surface 50a, the dimension measured in the axial direction of the winding core 23 is larger than Fig.12 These features do not become an obstacle to wire winding, but help to further improve the mechanical strength of the core 22a.

[0072] In the second and third embodiments described above, two slope surfaces such as the first slope surface 50a and the second slope surface 50b are provided as the slope surface 50, but three or more slope surfaces may be provided. In addition, for each of the plurality of slope surfaces, the angle, curvature and length in the axial direction relative to the inner end surface may be arbitrarily changed.

[0073] [Fourth Embodiment]

[0074] Reference Fig.15 and Fig.16 Next, a core 22 c included in a coil component according to a fourth embodiment of the present invention will be described. Fig.15 is with Figure 2 The corresponding figure, Fig.16 is with Figure 8 The corresponding figure. Fig.15 and Fig.16 In, with Figure 2 or Figure 8 Corresponding elements are denoted by the same reference numerals, and duplicate descriptions are omitted.

[0075] In the present embodiment, the chamfers forming the recessed portion 45 are not provided over the entire length of each of the ridges 46 to 49. The recessed portion 45 is provided only near the first flange portion 24 and the second flange portion 25 of each of the ridges 46 to 49. This structure is based on the idea that the recessed portion 45 can be any size as long as it can accommodate the slope surface 50. According to this structure, the reduction in the volume of the core 22c caused by the formation of the recessed portion 45 can be suppressed, which helps to obtain a higher inductance value.

[0076] [Other embodiments]

[0077] As mentioned above, the coil component according to the present invention has been described in relation to the illustrated embodiment, but other various modifications are possible within the scope of the present invention.

[0078] For example, in the illustrated embodiment, the winding core 23 is substantially in the shape of a quadrangular prism having four ridges extending parallel to each other, but may be in the shape of a polygonal prism other than a quadrangular prism, or may be in the shape of a substantially cylindrical column, an elliptical column, or the like.

[0079] In the illustrated embodiment, the recessed portion 45 having the sloped surface 50 is formed by chamfering the ridges 46 to 49 of the substantially quadrangular-shaped winding core 23. This structure is considered to be the most effective structure for improving the mechanical strength of the core having the substantially quadrangular-shaped winding core, but is not limited to this structure.

[0080] For example, only one of the plurality of ridges 46 to 49 may have a concave portion and a sloped surface, or three of the plurality of ridges 46 to 49 may have a concave portion and a sloped surface, or only two ridges facing each other in the diagonal direction of the plurality of ridges 46 to 49 may have a concave portion and a sloped surface. In addition, a structure in which a concave portion without a sloped surface is provided on a ridge without a sloped surface may be included.

[0081] The concave portion with the sloped surface can be located at any position as long as it is on the side of the winding core portion where the peripheral surface of the winding core portion and the inner end surface of each flange portion intersect. Therefore, the concave portion with the sloped surface can be located at a position other than the ridgeline of the substantially polygonal column-shaped winding core portion, for example, between two adjacent ridgelines.

[0082] In addition, as described above, it is considered that when the core portion is generally cylindrical or elliptical, the recessed portion having the sloped surface can be located at any position as long as it is on the circumferential side of the portion where the circumferential surface of the core portion intersects with the inner end surfaces of the flange portions, but it is particularly preferably located on the side of the core portion facing the mounting surface.

[0083] In addition, although not shown, a top plate may also be provided in the coil component 21 so as to connect the top surfaces 32 and 33 of the first flange portion 24 and the second flange portion 25. If the core 22 and the top plate are both made of magnetic bodies, the top plate and the core 22 work together to form a closed magnetic circuit. In addition, a coating material may be applied instead of the top plate so as to connect the top surfaces 32 and 33 of the first flange portion 24 and the second flange portion 25, and to cover the top surfaces 32 and 33 of the winding core portion 23 and the wire 42. As the coating material, a resin containing magnetic powder is preferably used.

[0084] Furthermore, the illustrated embodiment is an embodiment directed to a coil component including one wire, but the present invention can also be applied to a coil component including two or more wires and functioning as, for example, a common mode choke coil, a transformer, or the like.

[0085] In addition, the above-mentioned embodiments are merely examples, and some structures may be replaced or combined between different embodiments.

Claims

1. A coil component, characterized in that: have: A core body, comprising a winding core portion and a flange portion, wherein the winding core portion has a peripheral surface and extends in an axial direction, and the flange portions are respectively provided at ends of the winding core portion in opposite directions in the axial direction, and the core body is configured such that the axial direction of the winding core portion extends parallel to the mounting surface; a terminal electrode disposed on at least the mounting surface side of each of the flange portions; as well as a wire material wound around the peripheral surface of the winding core and connected to the terminal electrode, The winding core is substantially in the shape of a polygonal column having a plurality of ridges extending parallel to each other. Each of the flanges has an inner end surface facing the winding core and on which each end of the winding core is placed, and an outer end surface facing outward on the opposite side of the inner end surface. A concave portion is provided at a portion of the circumferential surface of the winding core portion where the circumferential surface of the winding core portion intersects the inner end surface of each flange portion, the concave portion is formed by a chamfer, the chamfer is formed as a groove extending along at least one of the ridge lines, and a slope surface is provided in the concave portion, the slope surface is inclined at an obtuse angle relative to the inner end surface and extends in a direction away from the inner end surface, The slope surface includes at least a first slope surface and a second slope surface connected in a direction away from the inner end surface, the first slope surface and the second slope surface are sequentially arranged in a direction away from the inner end surface, and at least one of an angle, a curvature, and a length in the axial direction of the first slope surface and the second slope surface relative to the inner end surface is different from each other, A boundary between the first slope surface and the second slope surface is located at the same position as the peripheral surface or closer to the central axis than the peripheral surface in a direction from the peripheral surface side of the winding core toward the central axis side of the winding core.

2. The coil component according to claim 1, characterized in that The chamfer is provided over the entire length of the ridge line.

3. The coil component according to claim 1, characterized in that The winding core is substantially in the shape of a quadrangular prism having four ridges extending parallel to each other.

4. The coil component according to claim 3, characterized in that The chamfers are arranged on all the edge lines.

5. A coil component, characterized in that: have: A core body, comprising a winding core portion and a flange portion, wherein the winding core portion has a peripheral surface and extends in an axial direction, and the flange portions are respectively provided at ends of the winding core portion in opposite directions in the axial direction, and the core body is configured such that the axial direction of the winding core portion extends parallel to the mounting surface; a terminal electrode disposed on at least the mounting surface side of each of the flange portions; as well as a wire material wound around the peripheral surface of the winding core and connected to the terminal electrode, Each of the flanges has an inner end surface facing the winding core and on which each end of the winding core is placed, and an outer end surface facing outward on the opposite side of the inner end surface. A concave portion formed by a groove is provided at a portion of the circumferential direction of the circumferential surface of the winding core portion where the circumferential surface of the winding core portion intersects the inner end surface of each flange portion, and a slope surface is provided in the concave portion, the slope surface is inclined at an obtuse angle with respect to the inner end surface and extends in a direction away from the inner end surface, The slope surface includes at least a first slope surface and a second slope surface connected in a direction away from the inner end surface, the first slope surface and the second slope surface are sequentially arranged in a direction away from the inner end surface, and at least one of an angle, a curvature, and a length in the axial direction of the first slope surface and the second slope surface relative to the inner end surface is different from each other, A boundary between the first slope surface and the second slope surface is located at the same position as the peripheral surface or closer to the central axis than the peripheral surface in a direction from the peripheral surface side of the winding core toward the central axis side of the winding core.

6. The coil component according to any one of claims 1 to 5, characterized in that: When viewed in a direction perpendicular to the axial direction of the winding core and parallel to the mounting surface, the slope surface is inclined at an obtuse angle relative to the inner end surface and extends in a direction away from the inner end surface. The recessed portion provided with the sloped surface is arranged at least on a first side of the peripheral surface of the winding core portion that is opposed to the mounting surface.

7. The coil component according to claim 6, characterized in that The recessed portion provided with the sloped surface is arranged on both the first side of the peripheral surface of the winding core portion facing the mounting surface and the second side of the peripheral surface of the winding core portion opposite to the first side.

8. The coil component according to any one of claims 1 to 5, characterized in that: The slope surface includes a plane.

9. The coil component according to any one of claims 1 to 5, characterized in that: The slope surface includes a concave arc surface.

10. The coil component according to any one of claims 1 to 5, characterized in that: The end portion of the slope surface on the inner end surface side is located at the same position as the peripheral surface or closer to the central axis than the peripheral surface in a direction from the peripheral surface side of the winding core toward the central axis side of the winding core.

11. The coil component according to any one of claims 1 to 5, characterized in that: The first slope surface extends from the inside of the recessed portion to the inner end surface side, over the entire circumference of the circumferential surface of the winding core at a portion where the circumferential surface of the winding core and the inner end surfaces of the flange portions intersect.

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