Core and coil components

Abstract

A core and coil component that realizes stabilization of installation and reduction of difference in inductance value. The core has a winding core portion extending in an axial direction and flange portions provided at both ends of the axial direction of the winding core portion, respectively, the flange portions having an inner surface toward the winding core portion side, an outer surface toward the side opposite to the inner surface, and a lower surface connecting the inner surface and the outer surface, at least one of the flange portions at the both ends having a groove portion that is open at the lower surface and the inner surface, the width of the bottom surface of the groove portion being wider from the inner surface toward the outer surface.

Description

Technical Field

[0001] This invention relates to core and coil components. Background Technology

[0002] Conventionally, as a coil component, there is a coil component described in Japanese Patent Application Publication No. 2011-119379 (Patent Document 1). This coil component includes: a core body, which includes a winding core portion and flange portions provided at both ends of the winding core portion; an electrode portion provided on the flange portions of the core body; and a wire, which is wound around the winding core portion of the core body and electrically connected to the electrode portion.

[0003] The flange portion has an inner surface facing the core portion, an outer surface facing the opposite side of the inner surface, and a lower surface connecting the inner and outer surfaces. The flange portion has a groove that opens into the lower surface and the inner surface. The width of the groove narrows from the inner surface towards the outer surface. An electrode portion is disposed on the lower surface of the flange portion. The end of the wire passes through the groove and is pressed against the lower surface of the flange portion near the groove.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2011-119379

[0005] However, in the aforementioned conventional coil components, the end of the wire is pressed against the lower surface of the flange on the outside of the groove. Therefore, there is a concern that the pressed portion of the wire end may hinder the installation when the coil component is mounted on the mounting substrate, thus failing to achieve stable installation.

[0006] Furthermore, the width of the slot narrows from the inner surface towards the outer surface, resulting in a wider slot on the inner surface side. Consequently, the winding position of the wire wound on the core sometimes varies on the inner surface side of the slot, becoming a significant factor in the difference in inductance value caused by slight variations in the wire path. Summary of the Invention

[0007] To this end, this disclosure provides a core and coil components that achieve stable installation and reduce differences in inductance values.

[0008] To address the aforementioned issues, one embodiment of the core disclosed herein comprises:

[0009] The core portion, which extends axially; and

[0010] Flange portions are respectively provided at both ends of the aforementioned core portion along its axial direction.

[0011] The flange portion has an inner surface facing the core portion, an outer surface facing the side opposite to the inner surface, and a lower surface connecting the inner surface and the outer surface.

[0012] At least one of the flange portions at both ends has a groove that opens on the lower surface and the inner surface.

[0013] The width of the bottom surface of the aforementioned groove increases from the aforementioned inner surface toward the aforementioned outer surface.

[0014] Here, the lower surface of the flange portion of the core refers to the surface on the mounting side when the coil component including the core is mounted on the mounting substrate. Furthermore, the width of the bottom surface of the groove refers to the dimension perpendicular to the axis of the winding core when viewed from a direction orthogonal to the lower surface of the flange portion.

[0015] According to the above method, when the core is used in the coil component, that is, when the electrode portion is provided on the lower surface of the flange portion of the core and in the groove portion of the flange portion, and the end of the wire is pressed into the groove portion, the pressed portion of the end of the wire is in the groove portion. Therefore, when the coil component is mounted on the mounting substrate, the situation where the pressed portion of the end of the wire hinders the installation can be reduced, thereby achieving stable installation.

[0016] Furthermore, the width of the bottom surface of the slot increases from the inner surface to the outer surface, resulting in a narrower width on the inner surface side of the bottom surface. Therefore, the wire wound on the core is positioned on the inner surface side of the bottom surface of the slot, which can suppress differences in the winding position of the wire and thus reduce differences in inductance.

[0017] Preferably, in one technical solution of the coil component, the following features are included:

[0018] The aforementioned core;

[0019] Electrode portion, which is disposed on the flange portion of the core; and

[0020] The wire is wound around the core portion of the aforementioned core and electrically connected to the aforementioned electrode portion.

[0021] The electrode portion is disposed on the lower surface of the flange portion and within the groove portion of the flange portion.

[0022] The end of the aforementioned wire includes a crimp portion that is crimped to the aforementioned electrode portion.

[0023] The aforementioned crimping portion is located within the aforementioned groove.

[0024] According to the above technical solution, the crimped portion at the end of the wire is located inside the groove. Therefore, when mounting the coil component on the mounting substrate, the crimped portion at the end of the wire is reduced from hindering the mounting, thereby stabilizing the mounting.

[0025] Furthermore, the width of the bottom surface of the slot increases from the inner surface to the outer surface, resulting in a narrower width on the inner surface side of the bottom surface. Therefore, the wire wound on the core is positioned on the inner surface side of the bottom surface of the slot, which can suppress differences in the winding position of the wire and thus reduce differences in inductance.

[0026] Preferably, in one embodiment of the coil component, the maximum depth of the groove is less than the diameter of the wire.

[0027] According to the above technical solution, the maximum depth of the groove is less than the diameter of the wire. Therefore, when the end of the wire is placed in the groove and hot-pressed using a heater, the end of the wire protrudes from the groove and can more reliably contact the heater. This allows for more reliable crimping of the wire end within the groove.

[0028] In a preferred embodiment of the coil component, the bottom surface of the groove is inclined relative to the lower surface, such that the depth of the groove becomes shallower from the inner surface toward the outer surface.

[0029] According to the above embodiment, the bottom surface of the groove is inclined relative to the lower surface, making the depth of the groove shallower from the inner surface to the outer surface. Therefore, when performing hot pressing with a heater, the stress applied to the end of the wire on the outer surface side of the groove can be increased, thereby improving the fixing force between the wire and the electrode. In addition, when cutting the wire wound around the core, a large stress can be applied to the end of the wire on the outer surface side of the groove, thereby reducing wire cutting defects.

[0030] In one preferred embodiment of the coil component, the bottom surface of the groove is connected to the lower surface of the flange at the outer surface side.

[0031] According to the above technical solution, the bottom surface of the groove is connected to the lower surface of the flange on the outer surface side, so the bottom surface of the groove has the same height as the lower surface of the flange on the outer surface side. This allows for the application of large stress through the end of the wire.

[0032] In one preferred embodiment of the coil component, the groove has openings on the lower surface, the inner surface, and the outer surface.

[0033] According to the above technical solution, the groove also has an opening on the outer surface, so when the wire is wound around the core, it can be easily guided to the wire entry position into the core, thereby further improving the yield of the winding when producing coil components.

[0034] Preferably, in one embodiment of the coil component, the width of the bottom surface of the groove closest to the inner surface is more than one time and less than three times the diameter of the wire.

[0035] According to the above technical solution, the width of the innermost surface of the bottom surface of the groove is more than one time the diameter of the wire. Therefore, when the wire wound on the core is placed on the inner surface of the bottom surface of the groove, the wire can be easily stored in the groove, thus facilitating wire positioning. Furthermore, the width of the innermost surface of the bottom surface of the groove is less than three times the diameter of the wire. Therefore, when the wire wound on the core is placed on the inner surface of the bottom surface of the groove, the amount of play when the wire is placed in the groove can be reduced, thereby suppressing differences in the winding position of the wire.

[0036] Preferably, in one embodiment of the coil component, the width of the opening in the lower surface of the groove is the same size from the inner surface toward the outer surface.

[0037] Here, "same size" means "actually the same size".

[0038] According to the above technical solution, the width of the opening on the lower surface of the groove is the same from the inner surface to the outer surface, thus allowing the width of the opening on the inner surface of the groove to be greater than the width of the bottom surface of the groove. This makes it easy to guide the wire wound on the core from the inner surface of the opening of the groove to the inner surface of the bottom surface of the groove.

[0039] In one preferred embodiment of the coil component, the width of the opening in the lower surface of the groove increases from the inner surface toward the outer surface.

[0040] According to the above technical solution, the width of the opening on the lower surface of the groove increases from the inner surface to the outer surface, thus the width of the inner surface side of the opening of the groove is relatively narrow. Therefore, the wire wound on the core can be positioned not only on the inner surface side of the bottom surface of the groove but also on the inner surface side of the opening of the groove.

[0041] Preferably, in one embodiment of the coil component, when viewed from a direction orthogonal to the lower surface of the flange portion, the extending direction of the groove portion is consistent with the lead-out direction of the end of the wire drawn from the core portion.

[0042] Here, the extension direction of the groove refers to the extension direction of the center line of the width of the bottom surface of the groove when viewed from a direction orthogonal to the lower surface of the flange.

[0043] According to the above technical solution, the extension direction of the groove is consistent with the lead-out direction of the end of the wire drawn from the core, so that the extension direction of the groove and the wire can be consistent, thereby reducing the stress applied to the wire.

[0044] Preferably, in one embodiment of the coil component, when viewed from a direction orthogonal to the lower surface of the flange portion, the groove portion overlaps with the extension line of the axis of the winding core portion.

[0045] According to the above technical solution, when viewed from a direction orthogonal to the lower surface of the flange, the extension lines of the axis of the groove and the core overlap, so the crimping part at the end of the wire can be set at the center position in the width direction of the flange, thereby further stabilizing the installation of the coil component.

[0046] Preferably, in one embodiment of the coil component, the width of the bottom surface of the groove portion closest to the outermost surface is at least 1.5 times the diameter of the wire and less than the width of the lower surface of the flange portion.

[0047] According to the above technical solution, the width of the outermost surface of the bottom of the groove is more than 1.5 times the diameter of the wire and less than the width of the lower surface of the flange. Therefore, the width of the outermost surface of the bottom of the groove is relatively wide. This allows for sufficient crimping of the wire end, further reducing the likelihood of the crimped portion of the wire end hindering installation. Furthermore, when the wire is wound around the core, sufficient clearance is formed at the wire entry point into the core, further improving the yield rate of the wound coil components.

[0048] Preferably, in one embodiment of the coil component, the width of the bottom surface of the groove closest to the outer surface is at least 1.5 times the width of the bottom surface of the groove closest to the inner surface.

[0049] According to the above technical solution, the width of the outermost surface of the bottom of the groove is more than 1.5 times the width of the innermost surface of the bottom of the groove, thus the width of the outermost surface of the bottom of the groove is relatively wide. Therefore, the end of the wire can be fully crimped, thereby further reducing the possibility of the crimped portion of the wire end hindering installation. In addition, when the wire is wound into the core, sufficient clearance can be formed at the wire entry point into the core, thereby further improving the yield of the winding when producing coil components.

[0050] According to one embodiment of the present disclosure, the core and coil components can achieve stable installation and reduce differences in inductance values. Attached Figure Description

[0051] Figure 1 This is a perspective view showing the first embodiment of the coil component as viewed from the lower surface side.

[0052] Figure 2 This is a bottom view of the core.

[0053] Figure 3A yes Figure 2 AA sectional view.

[0054] Figure 3B yes Figure 2 BB cross-sectional view.

[0055] Figure 4 yes Figure 1 XZ cross-sectional view of the first end of the wire.

[0056] Figure 5A This is a cross-sectional view illustrating the process of using a heater to heat-press wires.

[0057] Figure 5B This is a cross-sectional view illustrating the process of using a heater to heat-press wires.

[0058] Figure 6 This is a bottom view showing the core of the coil component in a second embodiment.

[0059] Figure 7A yes Figure 6 AA sectional view.

[0060] Figure 7B yes Figure 6 BB cross-sectional view.

[0061] Figure 8 This is a bottom view showing the core of the coil component in a third embodiment.

[0062] Figure 9A yes Figure 8 AA sectional view.

[0063] Figure 9B yes Figure 8 BB cross-sectional view.

[0064] Explanation of reference numerals in the attached figures:

[0065] 1…coil component; 10, 10A, 10B…core; 11…first flange; 111…inner surface; 112…outer surface; 113…lower surface; 12…second flange; 121…inner surface; 122…outer surface; 123…lower surface; 13…core; 21…wire; 21a…first end; 21b…second end; 210…crimping part; 31…first electrode; 32…second electrode; 50, 50A, 50B…groove; 51…bottom surface; 52…side surface; D…depth of groove; D1…maximum depth of groove; L…axis of core; R…diameter of wire; Wa…width of bottom surface of groove; Wa1…width at the innermost side of bottom surface; Wa2…width at the outermost side of bottom surface; Wb…width of groove opening. Detailed Implementation

[0066] The coil component of one embodiment of the present disclosure will now be described in detail with reference to the illustrated embodiments. Furthermore, the accompanying drawings include partial schematic diagrams and may not always reflect actual dimensions or proportions.

[0067] (First Implementation)

[0068] Figure 1 This is a perspective view showing the first embodiment of the coil component as viewed from the lower surface side. (See diagram below.) Figure 1 As shown, the coil component 1 includes: a core 10; a first electrode portion 31 and a second electrode portion 32 disposed on the core 10; and a wire 21 wound around the core 10 and connected to the first electrode portion 31 and the second electrode portion 32.

[0069] The core 10 has: a core portion 13 extending axially; a first flange portion 11 disposed at a first end of the core portion 13 along the axial direction and protruding in a direction orthogonal to the axial direction; and a second flange portion 12 disposed at a second end of the core portion 13 along the axial direction and protruding in a direction orthogonal to the axial direction. The material of the core 10 is preferably a magnetic material such as a sintered ferrite body or a molded body of resin containing magnetic powder, but it can also be a non-magnetic material such as alumina or resin.

[0070] Furthermore, in the following description, the lower surface of the core 10 is designated as the surface to which it is mounted onto the mounting substrate, and the surface of the core 10 opposite to the lower surface is designated as the upper surface of the core 10. The axial direction of the core portion 13 is defined as the X direction, the direction in which the lower and upper surfaces of the core 10 face each other is defined as the Z direction, and the direction orthogonal to the X and Z directions is defined as the Y direction. The X direction is also referred to as the length direction of the coil component 1, the Y direction as the width direction of the coil component 1, and the Z direction as the height direction of the coil component 1. The direction along the Z direction is defined as the upper side.

[0071] The first flange portion 11 has: an inner surface 111 facing the core portion 13; an outer surface 112 facing the side opposite to the inner surface 111; a lower surface 113 connecting the inner surface 111 and the outer surface 112; an upper surface 114 facing the side opposite to the lower surface 113; and two side surfaces 115 connecting the inner surface 111 and the outer surface 112 and connecting the lower surface 113 and the upper surface 114. Similarly, the second flange portion 12 has: an inner surface 121 facing the core portion 13; an outer surface 122 facing the side opposite to the inner surface 121; a lower surface 123; an upper surface 124; and two side surfaces 125. The lower surface 123, upper surface 124, and side surfaces 125 of the second flange portion 12 face the same direction as the lower surface 113, upper surface 114, and side surfaces 115 of the first flange portion 11. Furthermore, the terms "lower surface" and "upper surface" are illustrative concepts and may not actually correspond to "below" and "above" in the vertical direction.

[0072] The first flange portion 11 has a groove 50 on its lower surface 113, and the first electrode portion 31 is disposed within the lower surface 113 and the groove 50. The second flange portion 12 has a groove 50 on its lower surface 123, and the second electrode portion 32 is disposed within the lower surface 123 and the groove 50. Figure 1 As shown, for ease of explanation, the first electrode portion 31 and the second electrode portion 32 are indicated by shaded lines.

[0073] The wire 21 is wound around the core portion 13 along its axis. The wire 21 is, for example, an insulating wire formed by covering a conductor made of metal such as copper with a film made of a resin such as polyurethane or polyamide-imide. The first end 21a of the wire 21 is electrically connected to the first electrode portion 31, and the second end 21b of the wire 21 is electrically connected to the second electrode portion 32. The wire 21 is connected to the electrode portions 31 and 32, for example, by heat pressing, brazing, welding, etc.

[0074] Figure 2 This is a bottom view of core 10. Figure 3A yes Figure 2 AA sectional view. Figure 3B yes Figure 2 BB sectional view. For example... Figure 2 , Figure 3A as well as Figure 3B As shown, the groove 50 of the first flange portion 11 opens on the lower surface 113 and the inner surface 111. The width Wa of the bottom surface 51 of the groove 50 continuously widens from the inner surface 111 toward the outer surface 112. The width Wa of the bottom surface 51 refers to the dimension in the direction orthogonal to the axis L of the core portion 13 (Y direction) when viewed from a direction orthogonal to the lower surface 113 (Z direction). Similarly, the groove 50 of the second flange portion 12 opens on the lower surface 123 and the inner surface 121. The width Wa of the bottom surface 51 of the groove 50 continuously widens from the inner surface 121 toward the outer surface 122.

[0075] Figure 4 yes Figure 1 An XZ cross-sectional view of the first end 21a of the wire 21. (See attached image.) Figure 1 and Figure 4 As shown, the first end 21a of the wire 21 includes a crimping portion 210 that is crimped to the first electrode portion 31. The crimping portion 210 refers to the portion of the first end 21a of the wire 21 that is crimped into a flat shape, for example, the portion of the first end 21a that is deformed during heat crimping by a heater. The crimping portion 210 is deformed into a flat shape, for example. The crimping portion 210 is located within the groove portion 50. The crimping portion 210 is connected to the first electrode portion 31 provided on the bottom surface 51 of the groove portion 50.

[0076] The first electrode portion 31 has a base electrode layer 31a disposed on the first flange portion 11 and an electroplated layer 31b disposed on the base electrode layer 31a. The base electrode layer 31a is formed, for example, by firing a conductive paste such as Ag paste. The electroplated layer 31b includes, for example, Ni or Sn. The crimping portion 210 is crimped to the electroplated layer 31b, but the electroplated layer 31b can also be melted, and the crimping portion 210 is embedded in the electroplated layer 31b.

[0077] According to the coil component 1 described above, the crimping portion 210 of the first end 21a of the wire 21 is located in the groove 50. Therefore, when the coil component 1 is mounted on the mounting substrate, the situation where the crimping portion 210 of the first end 21a of the wire 21 obstructs the mounting can be reduced, thereby stabilizing the mounting.

[0078] Furthermore, the width Wa of the bottom surface 51 of the groove 50 increases from the inner surface 111 toward the outer surface 112, so the width Wa1 at the innermost side of the bottom surface 51 of the groove 50 is relatively narrow. Therefore, the wire 21 wound on the core portion 13 is positioned on the inner surface 111 side of the bottom surface 51 of the groove 50, which can suppress the difference in the winding position of the wire 21, thereby reducing the difference in inductance value.

[0079] Furthermore, when the first end 21a of the wire 21 is heat-pressed, the diffusion of coating residue from the wire 21 to the first electrode portion 31 on the lower surface 113 of the first flange portion 11 can be suppressed. Residue from the coating of the wire 21 could potentially cause solder non-wetting during installation, thus further stabilizing the installation. Additionally, the wider Wa2 at the outermost surface 112 side of the groove portion 50 allows for a clearance at the wire entry point into the core 10 when the wire 21 is wound around the core 10, thereby improving the winding yield when producing the coil component 1.

[0080] Furthermore, according to the core 10 described above, when the core 10 is used in the coil component 1, that is, when electrode portions 31 and 32 are provided in the lower surfaces 113 and 123 of the flange portions 11 and 12 of the core 10 and in the groove portions 50 of the flange portions 11 and 12, and the ends 21a and 21b of the wire 21 are pressed into the groove portions 50, the same effect as the coil component 1 described above is achieved.

[0081] Furthermore, the second end 21b of the wire 21 also includes a crimping portion 210 that is crimped to the second electrode portion 32. The crimping portion 210 is located within the groove portion 50. Therefore, the effect at the second end 21b of the wire 21 has the same effect as that described above at the first end 21a of the wire 21.

[0082] In the following description, the structure of the second flange portion 12 is the same as that of the first flange portion 11, and the effect of the second flange portion 12 is the same as that of the first flange portion 11. Therefore, the description of the second flange portion 12 is omitted.

[0083] like Figure 3A As shown, the bottom surface 51 of the groove 50 is inclined relative to the lower surface 113, causing the depth D of the groove 50 to continuously decrease from the inner surface 111 towards the outer surface 112. The maximum depth D1 of the groove 50 is less than the diameter R of the wire 21 (see reference). Figure 4 ).

[0084] The depth D of the groove 50 is the depth with the lower surface 113 of the first flange 11 as a reference (D=0). The diameter R of the wire 21 is the diameter of the portion of the wire 21 excluding the crimping portion 210.

[0085] exist Figure 3A In this case, the maximum depth D1 of the groove 50 is the depth D on the inner surface 111 side of the bottom surface 51. In addition, the bottom surface 51 of the groove 50 may also be inclined so that the depth D of the groove 50 gradually becomes shallower from the inner surface 111 toward the outer surface 112.

[0086] Therefore, the maximum depth D1 of the groove 50 is less than the diameter R of the wire 21, so as... Figure 5A As shown, in the process of heat-pressing the wire 21 using the heater 100, if the first end 21a of the wire 21 is placed in the groove 50, the first end 21a of the wire 21 will protrude from the groove 50. Furthermore, if the heater 100 presses the first end 21a of the wire 21, then... Figure 5B As shown, the heater 100 can reliably contact a large portion of the first end 21a of the wire 21 located within the groove 50. This allows for more reliable crimping of the first end 21a of the wire 21 within the groove 50. Specifically, a large portion of the first end 21a of the wire 21 within the groove 50 becomes a crimping portion 210. The surface of the crimping portion 210 is the same as the surface of the first electrode portion 31 adjacent to the crimping portion 210.

[0087] Furthermore, even though the first electrode portion 31 is disposed within the groove portion 50, its thickness is relatively thin, so the thickness of the first electrode portion 31 does not affect the aforementioned effect derived through the depth D of the groove portion 50. Similarly, in the following description, the thickness of the first electrode portion 31 does not affect the effect derived through the dimensions of the groove portion 50.

[0088] Furthermore, the bottom surface 51 of the groove 50 is inclined such that the depth D of the groove 50 becomes shallower from the inner surface 111 toward the outer surface 112. Therefore, when performing heat pressing using the heater 100, the stress applied to the first end 21a of the wire 21 on the outer surface 112 side of the groove 50 can be increased, thereby improving the fixing force between the wire 21 and the first electrode portion 31. In addition, when the wire 21 wound on the core 10 is cut, a large stress can be applied to the first end 21a of the wire 21 on the outer surface 112 side of the groove 50, thereby reducing the possibility of poor cutting of the wire 21.

[0089] like Figure 2 , Figure 3A as well as Figure 3B As shown, the bottom surface 51 of the groove 50 is connected to the lower surface 113 of the first flange 11 on the outer surface 112 side. Therefore, the bottom surface 51 of the groove 50 has the same height as the lower surface 113 of the first flange 11 on the outer surface 112 side. As a result, a large stress can be applied through the first end 21a of the wire 21.

[0090] Preferably, the width Wa1 of the innermost surface 111 of the bottom surface 51 of the groove 50 is more than one and less than three times the diameter R of the wire 21. Therefore, since the width Wa1 of the innermost surface 111 of the bottom surface 51 of the groove 50 is more than one time the diameter R of the wire 21, when the wire 21 wound on the core portion 13 is placed on the inner surface 111 of the bottom surface 51 of the groove 50, the wire 21 can be easily received in the groove 50, thus facilitating the positioning of the wire 21. Furthermore, since the width Wa1 of the innermost surface 111 of the bottom surface 51 of the groove 50 is less than three times the diameter R of the wire 21, when the wire 21 wound on the core portion 13 is placed on the inner surface 111 of the bottom surface 51 of the groove 50, the amount of play when the wire 21 is placed on the groove 50 can be reduced, thereby suppressing differences in the winding position of the wire 21.

[0091] Preferably, the width Wb of the opening on the lower surface 113 of the groove 50 is the same size from the inner surface 111 to the outer surface 112. The width Wb of the opening is equal to or greater than the maximum width of the bottom surface 51 (i.e., the width Wa2 of the outermost surface 112 side of the bottom surface 51). Therefore, since the width Wb of the opening on the lower surface 113 of the groove 50 is the same size from the inner surface 111 to the outer surface 112, the width Wb of the opening on the inner surface 111 side of the groove 50 can be made greater than the width Wa1 of the innermost surface 111 side of the bottom surface 51 of the groove 50. This allows the wire 21 wound on the core portion 13 to be easily guided from the inner surface 111 side of the opening of the groove 50 to the inner surface 111 side of the bottom surface 51 of the groove 50.

[0092] Furthermore, the width Wb of the opening of the groove 50 is equal to or greater than the maximum width of the bottom surface 51. Therefore, the two side surfaces 52 of the groove 50 in the width direction are inclined such that the gap between the two side surfaces 52 becomes wider as the depth D of the groove 50 becomes shallower. Thus, when the groove 50 is formed using a mold, the inclined side surfaces 52 of the groove 50 make it easy to remove the mold from the groove 50, thereby facilitating the formation of the groove 50. Alternatively, the groove 50 can also be formed by cutting or laser processing.

[0093] Preferably, when viewed from a direction orthogonal to the lower surface 113 of the first flange portion 11, the extending direction of the groove portion 50 is consistent with the lead-out direction of the first end 21a of the wire 21 leading out from the core portion 13. The extending direction of the groove portion 50 refers to the direction in which the center line of the width Wa of the bottom surface 51 of the groove portion 50 extends when viewed from a direction orthogonal to the lower surface 113 of the first flange portion 11. The lead-out direction of the first end 21a of the wire 21 leading out from the core portion 13 refers to the extending direction of the portion between the crimped portion 210 and the portion wound around the core portion 13 in the wire 21. Therefore, since the extending direction of the groove portion 50 is consistent with the lead-out direction of the first end 21a of the wire 21 leading out from the core portion 13, the groove portion 50 and the extending direction of the wire 21 can be aligned, thereby reducing the stress applied to the wire 21.

[0094] Preferably, the groove 50 overlaps with the extension of the axis L of the core portion 13 when viewed from a direction orthogonal to the lower surface 113 of the first flange portion 11. Therefore, the crimping portion 210 of the first end 21a of the wire 21 can be positioned at the center of the width direction of the first flange portion 11, thereby further stabilizing the mounting of the coil component 1. More preferably, the extending direction of the groove 50 is aligned with the axis L of the core portion 13, thereby further stabilizing the mounting of the coil component 1.

[0095] Preferably, the width Wa2 of the outermost surface 112 of the bottom surface 51 of the groove 50 is at least 1.5 times the diameter R of the wire 21 and less than the width of the lower surface 113 of the first flange 11. This wider width Wa2 of the bottom surface 51 of the groove 50 allows for sufficient crimping of the first end 21a of the wire 21, further reducing the likelihood of the crimped portion 210 of the first end 21a of the wire 21 obstructing installation. Furthermore, sufficient clearance is created at the wire entry point of the wire 21 into the core 10 when the wire 21 is wound around the core 10, further improving the yield rate of the winding when producing the coil component 1.

[0096] Preferably, the width Wa2 of the bottom surface 51 of the groove 50 at the outermost surface 112 is at least 1.5 times the width Wa1 of the bottom surface 51 at the innermost surface 111. Therefore, the width Wa2 of the bottom surface 51 of the groove 50 at the outermost surface 112 is relatively wide. Therefore, the first end 21a of the wire 21 can be sufficiently crimped, thereby further reducing the possibility of the crimped portion 210 of the first end 21a of the wire 21 obstructing installation. In addition, when the wire 21 is wound around the core 10, a sufficient clearance can be formed at the wire entry position of the wire 21 into the core 10, thereby further improving the winding yield when producing the coil component 1.

[0097] (Second Implementation)

[0098] Figure 6 This is a bottom view showing the core of the coil component in a second embodiment. Figure 7A yes Figure 6 AA sectional view. Figure 7B yes Figure 6 The BB cross-sectional view shows that the shape of the groove in the core of the second embodiment differs from that of the first embodiment. This difference in structure will be described below. Other structures are the same as those in the first embodiment, and therefore their descriptions are omitted.

[0099] like Figure 6 , Figure 7A as well as Figure 7B As shown, in the core 10A of the coil component in the second embodiment, the width Wb of the opening Wb of the groove 50A of the first flange 11 opening on the lower surface 113 widens from the inner surface 111 toward the outer surface 112. The opening of the groove 50A is shaped along the bottom surface 51 of the groove 50A. The width Wb of the opening of the groove 50A is greater than the width Wa of the bottom surface 51 of the groove 50A.

[0100] The bottom surface 51 of the groove 50A is a flat surface parallel to the lower surface 113. That is, the depth D of the groove 50A is constant from the inner surface 111 to the outer surface 112. In addition, the groove 50A has openings on the lower surface 113 and the inner surface 111, but no opening on the outer surface 112. That is, a partition wall is provided on the outer surface 112 side of the groove 50A.

[0101] Therefore, the width Wb of the opening of the groove 50A widens from the inner surface 111 toward the outer surface 112, and thus the width of the opening of the groove 50A on the inner surface 111 side is narrower. Therefore, the wire 21 wound on the core portion 13 can be positioned not only on the inner surface 111 side of the bottom surface 51 of the groove 50A, but also on the inner surface 111 side of the opening of the groove 50A.

[0102] Furthermore, the structure of the second flange portion 12 is the same as that of the first flange portion 11, and the effect of the second flange portion 12 is the same as that of the first flange portion 11. Therefore, the description of the second flange portion 12 is omitted.

[0103] (Third Implementation)

[0104] Figure 8 This is a bottom view showing the core of the coil component in a third embodiment. Figure 9A yes Figure 8 AA sectional view. Figure 9B yes Figure 8 The BB cross-sectional view shows that the shape of the groove in the core of the third embodiment differs from that of the second embodiment. This difference in structure will be described below. Other structures are the same as those in the second embodiment, and therefore their descriptions are omitted.

[0105] like Figure 8 , Figure 9A as well as Figure 9B As shown, in the core 10B of the coil component in the third embodiment, the slot 50B has openings on its lower surface 113, inner surface 111, and outer surface 112. That is, the slot 50B extends through the first flange 11 along the axis L of the core portion 13. The structure of the opening on the lower surface 113 side of the slot 50B and the structure of the bottom surface 51 of the slot 50B are the same as those of the slot 50A in the second embodiment.

[0106] As a result, the groove 50B also has an opening on the outer surface 112, so when the wire 21 is wound around the core 10B, the wire 21 can be easily guided to the wire entry position into the core 10B, thereby further improving the winding yield when producing coil components.

[0107] Furthermore, the structure of the second flange portion 12 is the same as that of the first flange portion 11, and the effect of the second flange portion 12 is the same as that of the first flange portion 11. Therefore, the description of the second flange portion 12 is omitted.

[0108] Furthermore, this disclosure is not limited to the above-described embodiments, and design changes can be made without departing from the spirit of this disclosure. For example, various combinations of the feature points of the first to third embodiments can be made.

[0109] In the first to third embodiments described above, although the number of wires is one, there may be multiple wires. In addition, although the number of grooves is one in each flange, there may be multiple grooves depending on the number of wires.

[0110] Although the groove is provided on both the first flange and the second flange, it may also be provided on at least one flange. Although the shape of the groove is the same on both the first flange and the second flange, it may also be different.

[0111] In the first to third embodiments described above, although the width of the bottom surface of the groove continuously increases from the inner surface to the outer surface, it may also increase in stages. Although the electrode portion is provided on the entire surface of the lower surface of the flange portion, it may also be provided on at least a portion of the lower surface of the flange portion.

[0112] In the first to third embodiments described above, although the extending direction of the groove is consistent with the axial direction of the core portion, it may also be inclined relative to the axial direction of the core portion. Although the extension line of the groove and the axis of the core portion overlaps when viewed from a direction orthogonal to the lower surface of the flange portion, it may also not overlap with the axis of the core portion. For example, the groove may also be biased towards the side surface of the flange portion relative to the axis of the core portion.

[0113] In the second and third embodiments described above, although the width of the opening of the groove is greater than the width of the bottom surface of the groove, the width of the opening of the groove can also be the same as the width of the bottom surface of the groove. In this case, the side surface of the groove is orthogonal to the lower surface of the flange.

Claims

1. A core, wherein, have: The core portion, which extends axially; and Flange portions are respectively disposed at both ends of the winding core portion along its axial direction. The flange portion has an inner surface facing the core portion, an outer surface facing the side opposite to the inner surface, and a lower surface connecting the inner surface and the outer surface. At least one of the flange portions at both ends has a groove that opens on the lower surface and the inner surface. The width of the bottom surface of the groove increases from the inner surface toward the outer surface. From the inner surface toward the outer surface, the openings of the groove on the lower surface are of the same width.

2. A core, wherein, have: The core portion, which extends axially; and Flange portions are respectively disposed at both ends of the winding core portion along its axial direction. The flange portion has an inner surface facing the core portion, an outer surface facing the side opposite to the inner surface, and a lower surface connecting the inner surface and the outer surface. At least one of the flange portions at both ends has a groove that opens on the lower surface and the inner surface. The width of the bottom surface of the groove increases from the inner surface toward the outer surface. As the groove extends from the inner surface toward the outer surface, its depth decreases. The width of the opening at the lower surface of the groove is equal to or greater than the maximum width of the bottom surface, and the two sides of the groove in the width direction are inclined relative to the lower surface in such a way that the spacing between the two sides becomes wider as the depth of the groove becomes shallower.

3. A coil component, wherein, have: The core as described in claim 1 or 2; An electrode portion, which is disposed on the flange portion of the core; and The wire is wound around the core portion of the core and electrically connected to the electrode portion. The electrode portion is disposed on the lower surface of the flange portion and within the groove portion of the flange portion. The end of the wire includes a crimp portion that is crimped to the electrode portion. The crimping portion is located inside the groove.

4. The coil component according to claim 3, wherein, The maximum depth of the groove is less than the diameter of the wire.

5. The coil component according to claim 3, wherein, The bottom surface of the groove is inclined relative to the lower surface, so that the depth of the groove becomes shallower from the inner surface toward the outer surface.

6. The coil component according to claim 5, wherein, The bottom surface of the groove is connected to the lower surface of the flange on the outer surface side.

7. The coil component according to claim 3, wherein, The groove opens on the lower surface, the inner surface, and the outer surface.

8. The coil component according to claim 3, wherein, The width of the bottom surface of the groove, at the innermost side, is more than one time and less than three times the diameter of the wire.

9. The coil component according to claim 3, wherein, The width of the opening on the lower surface of the groove increases from the inner surface toward the outer surface.

10. The coil component according to claim 3, wherein, When viewed from a direction orthogonal to the lower surface of the flange, the extension direction of the groove is consistent with the lead-out direction of the end of the wire drawn from the core portion.

11. The coil component according to claim 3, wherein, When viewed from a direction orthogonal to the lower surface of the flange, the groove overlaps with the extension of the axis of the core portion.

12. The coil component according to claim 3, wherein, The width of the bottom surface of the groove, at the outermost side, is at least 1.5 times the diameter of the wire and less than the width of the lower surface of the flange.

13. The coil component according to claim 3, wherein, The width of the bottom surface of the groove closest to the outer surface is more than 1.5 times the width of the bottom surface of the groove closest to the inner surface.

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