inductor

Abstract

To provide an inductor capable of increasing reliability.SOLUTION: An inductor 100 includes: a magnetic core 10 having a bottom surface 11, a top surface 12 and side faces 13a-13d; a coil part 21 embedded in the core 10; a coil element connected to an end of the coil 21, and has a drawer part 22 drawn out from the side face 13c to an outside of the core 10; and a plate-like electrode member 30 that is placed on the side face 13c and electrically connected to the coil element via a lead-out part 22. The electrode member 30 has a side plate part 32 located along the side face 13c from which the lead-out part 22 is drawn out and multiple projecting plate parts 35 projecting from the side plate portion 32 in a direction away from side face 13c. The side plate portion 32 has a through opening 33 passing through the side plate portion 32 in a thickness direction. The lead-out part 22 passes through the through opening 33 and is in contact with the multiple projecting plate parts 35. The multiple projecting plate parts 35 are welded to the lead-out part 22.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to inductors. [Background technology]

[0002] Inductors are passive elements that store electrical energy as magnetic energy and are used, for example, in DC-DC converter devices for the purposes of increasing or decreasing power supply voltage and smoothing direct current. Inductors are mounted on the surface of a circuit board, for example. For example, Patent Document 1 discloses an inductor that includes a main body containing a magnetic material, a coil element disposed inside the main body, and a terminal metal fitting connected to the coil element. In the inductor described in Patent Document 1, the tip of the coil element is exposed from the main body, and a terminal metal fitting is welded to the exposed tip of the coil element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-243685 Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above, an object of the present disclosure is to improve the reliability of inductors. [Means for solving the problem]

[0005] An inductor according to one aspect of the present disclosure includes a magnetic core having a bottom surface, a top surface, and side surfaces connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and drawn out from the side surface to the outside of the magnetic core; and a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead portion, wherein the electrode member has a side plate portion disposed along the side surface from which the lead portion is drawn out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, the side plate portion having a through opening penetrating through the thickness direction of the side plate portion, the lead portion penetrating through the through opening and in contact with the plurality of protruding plate portions, and the plurality of protruding plate portions being welded to the lead portion. an inductor, wherein the plurality of protruding plate portions are parallel to the bottom surface and face each other with the drawer portion therebetween, the plurality of protruding plate portions having a first protruding plate portion and a second protruding plate portion located closer to the bottom surface than the first protruding plate portion, the drawer portion having a rectangular cross section and having a drawer top surface parallel to the top surface and a drawer bottom surface located closer to the bottom surface than the drawer top surface, the first protruding plate portion being in contact with the drawer top surface and the second protruding plate portion being in contact with the drawer bottom surface, a first contact surface of the first protruding plate portion in contact with the drawer top surface and a second contact surface of the second protruding plate portion in contact with the drawer bottom surface being formed by different surfaces of the electrode member, and the first protruding plate portion is welded to the drawer top surface, and the second protruding plate portion is welded to the drawer bottom surface. An inductor according to one aspect of the present disclosure includes a magnetic core having a bottom surface, a top surface, and side surfaces connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and drawn out from the side surface to the outside of the magnetic core; and a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead portion, wherein the electrode member has a side plate portion disposed along the side surface from which the lead portion is drawn out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, the side plate portion having a through opening penetrating through the thickness direction of the side plate portion, the lead portion penetrating the through opening and in contact with the plurality of protruding plate portions, and the plurality of protruding plate portions being welded to the lead portion. The multiple protruding plate portions are parallel to the bottom surface and face each other with the drawer portion between them, the multiple protruding plate portions have a first protruding plate portion and a second protruding plate portion located closer to the bottom surface than the first protruding plate portion, the drawer portion has a rectangular cross section and has a drawer top surface parallel to the top surface and a drawer bottom surface located closer to the bottom surface than the drawer top surface, the first protruding plate portion is welded to the drawer top surface and the second protruding plate portion is welded to the drawer bottom surface, the first protruding plate portion has a protruding plate main body arranged along the drawer top surface and multiple side portions arranged from the protruding plate main body along the side surfaces of the drawer portion, the protruding plate main body is welded to the drawer top surface and the side portions are welded to the side surfaces of the drawer portion. An inductor according to one aspect of the present disclosure includes a magnetic core having a bottom surface, a top surface, and side surfaces connected to the bottom surface and the top surface, a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and drawn out from the side surface to the outside of the magnetic core, and a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead portion, wherein the electrode member has a side plate portion disposed along the side surface from which the lead portion is drawn out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, the side plate portion having a through opening penetrating in a thickness direction of the side plate portion, the lead portion penetrating the through opening and in contact with the plurality of protruding plate portions, and the plurality of protruding plate portions being welded to the lead portion. Each of the multiple protruding plate portions rises from a part of the boundary area between the side plate portion and the through opening, and the multiple protruding plate portions have a first protruding plate portion and a second protruding plate portion located closer to the bottom surface than the first protruding plate portion, and the drawer portion has a rectangular cross section and a drawer top surface parallel to the top surface and a drawer bottom surface located closer to the bottom surface than the drawer top surface, and the first protruding plate portion is welded to the drawer top surface and the second protruding plate portion is welded to the drawer bottom surface, and the first protruding plate portion has a protruding plate main body arranged along the drawer top surface and multiple side portions arranged from the protruding plate main body along the side surface of the drawer portion, and the protruding plate main body is welded to the drawer top surface and the side portions are welded to the side surface of the drawer portion. An inductor according to one aspect of the present disclosure includes a magnetic core having a bottom surface, a top surface, and side surfaces connected to the bottom surface and the top surface, a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and drawn out from the side surface to the outside of the magnetic core, and a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead portion, the electrode member having a side plate portion disposed along the side surface from which the lead portion is drawn out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, the side plate portion having a through opening penetrating through the side plate portion in a thickness direction, the lead portion penetrating the through opening and connected to the plurality of protruding plate portions and the plurality of protruding plate portions are welded to the drawer portion, wherein the plurality of protruding plate portions are parallel to the bottom surface and face each other with the drawer portion therebetween, the plurality of protruding plate portions having a first protruding plate portion and a second protruding plate portion located closer to the bottom surface than the first protruding plate portion, the drawer portion having a rectangular cross section and having a drawer top surface parallel to the top surface and a drawer bottom surface located closer to the bottom surface than the drawer top surface, the first protruding plate portion is welded to the drawer top surface and the second protruding plate portion is welded to the drawer bottom surface, and the width of the tip portion of the first protruding plate portion away from the side plate portion is narrower than the width of the base portion close to the side plate portion. An inductor according to one aspect of the present disclosure includes a magnetic core having a bottom surface, a top surface, and side surfaces connected to the bottom surface and the top surface, a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and drawn out from the side surface to the outside of the magnetic core, and a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead portion, wherein the electrode member has a side plate portion disposed along the side surface from which the lead portion is drawn out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, the side plate portion having a through opening penetrating through the side plate portion in a thickness direction, the lead portion penetrating the through opening and connected to the plurality of protruding plate portions an inductor in which the plurality of protruding plate portions are in contact with each other and the plurality of protruding plate portions are welded to the drawer portion, each of the plurality of protruding plate portions rising from a portion of the boundary area between the side plate portion and the through opening, the plurality of protruding plate portions having a first protruding plate portion and a second protruding plate portion located closer to the bottom surface than the first protruding plate portion, the drawer portion having a rectangular cross section and having a drawer top surface parallel to the top surface and a drawer bottom surface located closer to the bottom surface than the drawer top surface, the first protruding plate portion being welded to the drawer top surface and the second protruding plate portion being welded to the drawer bottom surface, and the width of the tip of the first protruding plate portion away from the side plate portion being narrower than the width of the base portion close to the side plate portion. An inductor according to one aspect of the present disclosure comprises a magnetic core having a bottom surface, a top surface, and side surfaces connected to the bottom surface and the top surface, a coil element having a coil portion embedded in the magnetic core and a draw-out portion connected to an end of the coil portion and drawn out from the side surface to the outside of the magnetic core, and a plate-shaped electrode member arranged on the side surface and electrically connected to the coil element via the draw-out portion, wherein the electrode member has a side plate portion arranged along the side surface from which the draw-out portion is drawn out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, the side plate portion having a through opening penetrating in the thickness direction of the side plate portion, the draw-out portion penetrating the through opening and contacting the plurality of protruding plate portions, and the plurality of protruding plate portions being welded to the draw-out portion, An inductor according to one aspect of the present disclosure comprises a magnetic core having a bottom surface, a top surface, and side surfaces connected to the bottom surface and the top surface, a coil element having a coil portion embedded in the magnetic core and a draw-out portion connected to an end of the coil portion and drawn out from the side surface to the outside of the magnetic core, and a plate-shaped electrode member arranged on the side surface and electrically connected to the coil element via the draw-out portion, wherein the electrode member has a side plate portion arranged along the side surface from which the draw-out portion is drawn out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, the side plate portion having a through opening penetrating in the thickness direction of the side plate portion, the draw-out portion penetrating the through opening and contacting the plurality of protruding plate portions, and the plurality of protruding plate portions being welded to the draw-out portion, and the side plate portion of the electrode member has raised portions that rise away from the side surface of the magnetic core on both outer sides of the side surface of the draw-out portion. An inductor according to one aspect of the present disclosure comprises a magnetic core having a bottom surface, a top surface, and side surfaces connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a draw-out portion connected to an end of the coil portion and drawn out from the side surface to the outside of the magnetic core; and a plate-shaped electrode member arranged on the side surface and electrically connected to the coil element via the draw-out portion, wherein the electrode member has a side plate portion arranged along the side surface from which the draw-out portion is drawn out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, the side plate portion having a through opening penetrating through the thickness direction of the side plate portion, the draw-out portion penetrating through the through opening and in contact with the plurality of protruding plate portions, and the plurality of protruding plate portions are welded to the draw-out portion, and the side plate portion of the electrode member has raised portions on both outer sides of the side surfaces of the draw-out portion that rise away from the side surfaces of the magnetic core, and the raised portions have an inclination angle of 80° or more with respect to the side surface. An inductor according to one aspect of the present disclosure comprises a magnetic core having a bottom surface, a top surface, and side surfaces connected to the bottom surface and the top surface, a coil element having a coil portion embedded in the magnetic core and a draw-out portion connected to an end of the coil portion and drawn out from the side surface to the outside of the magnetic core, and a plate-shaped electrode member arranged on the side surface and electrically connected to the coil element via the draw-out portion, wherein the electrode member has a side plate portion arranged along the side surface from which the draw-out portion is drawn out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, the side plate portion having a through opening penetrating in the thickness direction of the side plate portion, the draw-out portion penetrating the through opening and contacting the plurality of protruding plate portions, and the plurality of protruding plate portions are welded to the draw-out portion, and the side plate portion of the electrode member has raised portions on both outer sides of the side surfaces of the draw-out portion that rise away from the side surfaces of the magnetic core, and the raised portions have portions that gradually bulge out from the side surfaces. [Effects of the Invention]

[0006] According to the present disclosure, the reliability of the inductor can be improved. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a first perspective view of an inductor according to an embodiment. [Figure 2] FIG. 2 is a second perspective view of the inductor according to the embodiment. [Figure 3] 10 is a diagram showing a state before the lead-out portion and the protruding plate portion of the inductor according to the embodiment are welded; FIG. [Figure 4] 4A and 4B are front and side views of the drawer portion and the protruding plate portion shown in FIG. 3. [Figure 5]10A to 10C are diagrams illustrating an example of a manufacturing process for the protruding plate portion of the inductor according to the embodiment. [Figure 6A] 10 is a perspective view of an extended portion and a protruding plate portion of an inductor according to a first modified example of the embodiment. FIG. [Figure 6B] 10 is a diagram showing a state before the drawn-out portion and the protruding plate portion of the inductor according to the first modified example of the embodiment are welded. FIG. [Figure 7] 10A to 10C are diagrams illustrating an example of a manufacturing process for the protruding plate portion of the inductor according to the first modified example of the embodiment. [Figure 8A] 10 is a perspective view of an extended portion and a protruding plate portion of an inductor according to a second modification of the embodiment. FIG. [Figure 8B] 10 is a diagram showing a state before the drawn-out portion and the protruding plate portion of the inductor according to the second modification of the embodiment are welded. FIG. [Figure 9A] 11 is a perspective view of an extended portion and a protruding plate portion of an inductor according to a third modified example of the embodiment. FIG. [Figure 9B] FIG. 10 is a diagram showing a state before the drawn-out portion and the protruding plate portion of the inductor according to the third modification of the embodiment are welded. [Figure 10A] 10 is a perspective view of an extended portion and a protruding plate portion of an inductor according to a fourth modified example of the embodiment. FIG. [Figure 10B] FIG. 10 is a diagram showing a state before the drawn-out portion and the protruding plate portion of the inductor according to the fourth modification of the embodiment are welded. [Figure 11A] 13 is a perspective view of an extended portion and a protruding plate portion of an inductor according to a fifth modified example of the embodiment. FIG. [Figure 11B] FIG. 11 is a diagram showing a state before the drawn-out portion and the protruding plate portion of the inductor according to the fifth modification of the embodiment are welded. [Figure 12] 13A to 13C are diagrams illustrating an example of a manufacturing process for a protruding plate portion of an inductor according to a fifth modified example of the embodiment. [Figure 13A] 13 is a perspective view of an extended portion and a protruding plate portion of an inductor according to a sixth modified example of the embodiment. FIG. [Figure 13B]FIG. 13 is a diagram showing a state before the drawn-out portion and the protruding plate portion of the inductor according to the sixth modification of the embodiment are welded. [Figure 14] FIG. 13 is a side view of a side plate portion of an inductor according to a sixth modification of the embodiment. [Figure 15] 13A to 13C are diagrams illustrating an example of a manufacturing process for the side plate portion of the inductor according to the sixth modification of the embodiment. [Figure 16] 13 is a diagram showing another example of the side plate portion of the sixth modified example of the embodiment. FIG. [Figure 17] 13 is a diagram showing another example of the side plate portion of the sixth modified example of the embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] (Background to this disclosure) In a structure in which an electrode member is welded to the tip of a coil element, as in Patent Document 1 mentioned above, the cross-sectional area of ​​the connection portion connecting the coil element and the electrode member becomes small, which may reduce the reliability of the connection between the coil element and the electrode member. Furthermore, in a structure in which an electrode member is welded to the tip of a coil element, the cross-sectional area of ​​the current path at the welded portion cannot be increased, which increases the DC resistance and reduces the reliability of the inductor. Furthermore, if the cross-sectional area of ​​the current path at the welded portion cannot be increased, a temperature rise occurs when a current is applied to the inductor, which reduces the reliability of the inductor.

[0009] The present disclosure has the following configuration to improve the reliability of an inductor. Hereinafter, the embodiments will be described in more detail with reference to the drawings.

[0010] Note that the embodiments described below each illustrate a specific example of the present disclosure. The numerical values, shapes, materials, components, component placement positions, connection configurations, steps, and step sequences shown in the following embodiments are examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components that are not recited in independent claims are described as optional components.

[0011] Furthermore, in this specification, terms indicating the relationship between elements, such as parallelism, terms indicating the shape of elements, such as rectangular parallelepiped, and numerical ranges are not expressions that only express a strict meaning, but are expressions that also include a substantially equivalent range, for example, a difference of about a few percent.

[0012] In addition, each drawing is a schematic diagram in which emphasis, omission, or adjustment of proportions has been appropriately made to illustrate the present disclosure, and is not necessarily an exact illustration, and may differ from the actual shape, positional relationship, and proportion. In each drawing, substantially the same configuration is assigned the same reference numeral, and duplicated explanations may be omitted or simplified.

[0013] Each figure also shows the X-axis, Y-axis, and Z-axis, which represent three mutually orthogonal directions, and these axes and the axial directions along these axes are used as necessary for explanation. Note that each axis is added for explanation purposes only and does not limit the direction or posture in which the inductor is used.

[0014] Furthermore, in this specification, the terms "top surface" and "bottom surface" in the configuration of an inductor do not refer to the top surface (the surface on the vertically upper side) and bottom surface (the surface on the vertically lower side) in absolute spatial recognition, but are used as terms defined by the relative positional relationship of the components of the inductor.

[0015] (Embodiment) [Inductor configuration] The configuration of an inductor according to an embodiment will be described below: An inductor is a passive element that stores electrical energy flowing through a coil element as magnetic energy.

[0016] Fig. 1 is a first perspective view of an inductor 100 according to an embodiment. Fig. 2 is a second perspective view of the inductor 100. Note that the upper drawing in Fig. 1 shows an overall view of the inductor 100, and the lower drawing shows an enlarged perspective view of the lead-out portion 22 and the protruding plate portion 35 of the inductor 100.

[0017] As shown in Figures 1 and 2, the inductor 100 comprises a magnetic core 10, a coil element having a coil portion 21 and multiple lead-out portions 22, multiple electrode members 30 which are external terminals, and a connection portion which connects the lead-out portions 22 and the electrode members 30.

[0018] In the following explanation, the positive half of the X-axis in inductor 100 will be mainly described, but the negative half of the X-axis in inductor 100 has the same structure as the positive half of the X-axis in inductor 100, and the same explanation applies.

[0019] The approximate outer shape of inductor 100 is determined by the shape of magnetic core 10, which is, for example, a rectangular parallelepiped powder magnetic core. Magnetic core 10 can be molded into any shape. That is, depending on the shape of magnetic core 10 during molding, inductor 100 of any shape can be realized. Magnetic core 10 of this embodiment has, for example, dimensions in the X-axis direction of 17 mm or more, dimensions in the Y-axis direction of 17 mm or more, and dimensions in the Z-axis direction of 7 mm or more.

[0020] The magnetic core 10 is the outer shell of the inductor 100 and covers a portion of the coil element (coil portion 21). The magnetic core 10 includes a magnetic material, for example, a powder magnetic core made of a metal magnetic powder and a resin material. The magnetic core 10 may be formed using any magnetic material. The magnetic material may be ferrite or other magnetic materials. The metal magnetic powder is a particulate material having a predetermined element composition, such as an Fe-Si-Al-based, Fe-Si-based, Fe-Si-Cr-based, or Fe-Si-Cr-B-based material. The resin material is selected from materials such as silicone-based resins that can maintain a certain shape by binding the metal magnetic powder particles while insulating them from each other.

[0021] The magnetic core 10 has, for example, a rectangular parallelepiped shape. The magnetic core 10 has a bottom surface 11, a top surface 12 facing away from the bottom surface 11, and four side surfaces 13a, 13b, 13c, and 13d connected to the bottom surface 11 and the top surface 12. The side surfaces 13a and 13b are aligned in the X-axis direction and face each other back to back. The side surfaces 13c and 13d are aligned in the Y-axis direction and face each other back to back. The bottom surface 11, the top surface 12, and the side surfaces 13a, 13b, 13c, and 13d are each substantially flat planes. The pair of the bottom surface 11 and the top surface 12, the pair of the side surfaces 13a and 13b, and the pair of the side surfaces 13c and 13d are each pairs of surfaces that are in a parallel positional relationship. The bottom surface 11 and the top surface 12 extend in directions that intersect with the side surfaces 13a, 13b, 13c, and 13d, specifically in directions that are perpendicular to each other. The side surfaces 13a and 13b extend in directions that intersect with the side surfaces 13c and 13d, specifically in directions that are perpendicular to each other.

[0022] The coil element has a coil portion 21 made of a single wire embedded in magnetic core 10, and multiple lead portions 22 that correspond to both ends of the wire and are exposed to the outside of magnetic core 10. In other words, the coil element according to the embodiment is composed of one coil portion 21 and two lead portions 22. In FIG. 1, the embedded coil portion 21 is indicated by a dashed line.

[0023] The coil element is composed of, for example, a conductor wire. The conductor wire is composed of a metal wire made of a metal material selected from metals such as aluminum, copper, silver, and gold, alloys containing one or more of these metals, and materials made of metals or alloys and other substances, and an insulating coating that covers the metal wire. Specifically, the conductor wire is, for example, a copper wire covered with an insulating coating. The coil portion 21 and the lead-out portion 22 are names given to respective portions formed, for example, by processing a single member made of the same material.

[0024] The coil portion 21 is a portion covered by the magnetic core 10. The coil portion 21 is made of a wound conductor and functions as a coil. There is no particular limitation on the number of turns of the coil portion 21, and it may be selected appropriately, for example, from 0.5 to 10 turns, depending on the performance required of the inductor 100 and constraints such as the size of the magnetic core 10. The cross section of the conductor constituting the coil portion 21 is, for example, a rectangular wire with each side measuring 3.5 mm x 2.5 mm. The coil portion 21 is wound vertically with the surfaces including the long sides of the cross section of the conductor overlapping. The coil portion 21 is embedded in the magnetic core 10 so that the winding axis of the coil portion 21 is aligned along the direction connecting the bottom surface 11 and the top surface 12 (the Z-axis direction).

[0025] Coil portion 21 has end portions (not shown) that connect from the wound portion to side surface 13c of magnetic core 10. One end of coil portion 21 is located on the positive side of the X axis, which is closer to the right of the winding axis, when viewed from a direction perpendicular to side surface 13c, and the other end is located on the negative side of the X axis, which is closer to the left of the winding axis. Furthermore, when viewed from a direction perpendicular to side surface 13c, the ends of coil portion 21 are located closer to bottom surface 11 than the center of side surface 13c, and are at the same height from bottom surface 11.

[0026] Lead-out portion 22 is connected to an end of coil portion 21 and extends outward from side surface 13c of magnetic core 10. Specifically, lead-out portion 22 is led out in a direction perpendicular to side surface 13c from a position closer to bottom surface 11 than the center of side surface 13c. Lead-out portion 22 is led out from one side surface 13c of four side surfaces 13a to 13d.

[0027] Fig. 3 is a diagram showing the state of the lead-out portion 22 and the protruding plate portion 35 of the inductor 100 before they are welded. Fig. 4 is a diagram showing the lead-out portion 22 and the protruding plate portion 35 shown in Fig. 3 as viewed from the front and from the side. In this example, a view from the front means a view from the Y-axis direction perpendicular to the side surface 13c, and a view from the side means a view from the X-axis direction perpendicular to the side surface 13a. Fig. 4(a) shows a view of the lead-out portion 22 and the protruding plate portion 35 as viewed from the front, and Fig. 4(b) shows a cross-sectional view taken along the center line of Fig. 4(a).

[0028] The lead portion 22 shown in Figures 3 and 4 has a rectangular cross section. The lead portion 22 has a lead top surface 22a parallel to the top surface 12, a lead bottom surface 22b located closer to the bottom surface 11 than the lead top surface 22a, and two lead side surfaces 22c connecting the lead top surface 22a and the lead bottom surface 22b. The lead top surface 22a and the lead bottom surface 22b are parallel to each other. The insulating coating has been removed from the lead top surface 22a, the lead bottom surface 22b, and the lead side surfaces 22c so as to be electrically connected to the electrode member 30. The lead portion 22 passes through a through opening 33 in a side plate portion 32 of the electrode member 30, which will be described later, and is in contact with a plurality of protruding plate portions 35.

[0029] As shown in FIG. 1, the electrode members 30 are disposed outside the magnetic core 10 (for example, on the bottom surface 11 side, the side surface 13c side, and the other side surface 13d side) and are electrically connected to the lead portions 22 via connecting portions. An electrode member 30 is provided corresponding to each of the two lead portions 22. The electrode members 30 include a conductive material and are formed, for example, of a metal material plate. The metal material plate is formed of a metal material selected from metals such as aluminum, copper, silver, and gold, alloys containing one or more of these metals, and materials composed of a metal or alloy and another substance.

[0030] The electrode member 30 has a bottom plate portion 31 arranged on the bottom surface 11 side of the magnetic core 10, a side plate portion 32 connected to the bottom plate portion 31 and arranged on the side surface 13c side of the magnetic core 10, and a plurality of protruding plate portions 35 protruding outward from the side plate portion 32.

[0031] The electrode member 30 also has a locking portion 38 that is connected to the bottom plate portion 31 and is arranged on the other side surface 13d of the magnetic core 10. The bottom plate portion 31, the side plate portion 32, the locking portion 38, and the plurality of protruding plate portions 35 are names given to respective portions that are formed, for example, by processing a single member made of the same material.

[0032] The bottom plate portion 31 is disposed on the bottom surface 11 side of the magnetic core 10 so as to extend along the bottom surface 11. The bottom plate portion 31 may be fixed to the magnetic core 10 via an adhesive. When the inductor 100 is mounted on the circuit board, the bottom plate portion 31 is joined to the circuit board by soldering. Note that the bottom plate portion 31 may have a portion that protrudes outward from the magnetic core 10 when viewed from the top surface 12 side (when viewed in a plan view in the Z-axis direction). This is preferable because when soldering in a reflow furnace, the protruding portion can be easily heated by preheating the reflow furnace, improving solderability.

[0033] Side plate portion 32 is arranged to correspond to one side surface 13c of four side surfaces 13a to 13d of magnetic core 10. Side plate portion 32 is connected to bottom plate portion 31, arranged along side surface 13c of magnetic core 10, and extends from bottom plate portion 31 toward top surface 12. Side plate portion 32 also has a through opening 33 that penetrates in the thickness direction.

[0034] The through opening 33 has, for example, a rectangular shape, and the aforementioned lead portion 22 is inserted into the through opening 33. When viewed from the X-axis direction, the side plate portion 32 is in contact with the side surface 13c of the magnetic core 10, but is not limited to this and may be disposed with a gap from the side surface 13c. The side plate portion 32 may be fixed to the magnetic core 10 via an adhesive.

[0035] The protruding plate portion 35 is a portion that protrudes outward from the side plate portion 32. The multiple protruding plate portions 35 include a first protruding plate portion 36 and a second protruding plate portion 37 that is located closer to the bottom surface 11 than the first protruding plate portion 36. In other words, the first protruding plate portion 36 is located closer to the top surface than the second protruding plate portion 37. The first protruding plate portion 36 and the second protruding plate portion 37 are parallel to the bottom surface 11 or the top surface 12 of the magnetic core 10 and face each other with the lead portion 22 sandwiched between them. When viewed from the Y-axis direction perpendicular to the side plate portion 32, the width of the first protruding plate portion 36 is wider than the width of the second protruding plate portion 37.

[0036] Each protruding plate portion 35 rises from a part of the boundary region between the side plate portion 32 and the through opening 33 and protrudes in a direction away from the side surface 13c of the magnetic core 10. For example, the first protruding plate portion 36 rises from the boundary region along the inner wall 33a on the top surface 12 side of the through opening 33, and the second protruding plate portion 37 rises from the boundary region along the inner wall 33b on the bottom surface 11 side of the through opening 33. Each protruding plate portion 35 is disposed perpendicular to the side plate portion 32 or along the extension direction of the lead portion 22. For example, the protruding length of the protruding plate portion 35 protruding from the side plate portion 32 is 1.5 times or more the plate thickness of the protruding plate portion 35. Each protruding plate portion 35 may protrude beyond the tip portion 22e of the lead portion 22 before the protruding plate portion 35 and the lead portion 22 are welded together.

[0037] The first protruding plate portion 36 and the second protruding plate portion 37 are each in contact with the drawer portion 22. In other words, the drawer portion 22 is in contact with the first protruding plate portion 36 and the second protruding plate portion 37. The first protruding plate portion 36 has a first contact surface 36a that contacts the drawer top surface 22a of the drawer portion 22, and the second protruding plate portion 37 has a second contact surface 37b that contacts the drawer bottom surface 22b of the drawer portion 22. The first contact surface 36a and the second contact surface 37b face each other with the drawer portion 22 sandwiched therebetween.

[0038] The first contact surface 36a and the second contact surface 37b are formed on different surfaces of the electrode member 30. For example, if the plate-shaped electrode member 30 has a first surface that is one of the two main surfaces of the plate-shaped member and a second surface that is the other, and the first surface is in contact with the side surface 13c of the magnetic core 10, the first contact surface 36a is formed on a part of the second surface, and the second contact surface 37b is formed on a part of the first surface.

[0039] Each protruding plate portion 35 has a root portion 35f located on the side of the side plate portion 32, and a tip portion 35e located on the opposite side of the root portion 35f. The tip portion 35e of the protruding plate portion 35 is in contact with or close to the tip portion 22e of the drawn-out portion 22. Before welding, the tip portion 35e of the protruding plate portion 35 may be slightly spaced from the tip portion 22e of the drawn-out portion 22.

[0040] In this embodiment, a connection portion is formed at least at a location where the tip 22e of the drawer portion 22 and the tip 35e of the protruding plate portion 35 are in contact with or close to each other (see FIG. 1). This connection portion is formed by welding the drawer portion 22 to each protruding plate portion 35. For example, the connection portion is composed of multiple weld marks ws formed by laser seam welding. When viewed from the Y-axis direction, the multiple weld marks ws are connected along the direction of extension of the upper side of the drawer portion 22, which is the drawer top surface 22a, and the lower side of the drawer portion 22, which is the drawer bottom surface 22b. All of the multiple weld marks ws may be continuously connected, or only some of the weld marks ws may be continuously connected. Adjacent weld marks ws may also be continuously connected so that they overlap. The first protruding plate portion 36 is welded to the drawer top surface 22a, and the second protruding plate portion 37 is welded to the drawer bottom surface 22b, so that the protruding plate portion 35 and the drawer portion 22 are electrically connected via the connection portion.

[0041] In this embodiment, the lead-out portion 22 of the coil element passes through the through opening 33 of the side plate portion 32 and contacts multiple protruding plate portions 35, which are welded to the lead-out portion 22.

[0042] This makes it possible to increase the length of the connection formed by welding each protruding plate portion 35 to the lead-out portion 22. This allows the cross-sectional area of ​​the connection portion connecting the coil element and the electrode member 30 to be increased, thereby improving the reliability of the connection between the coil element and the electrode member 30. Furthermore, since the cross-sectional area of ​​the current path at the connection portion can be increased, the DC resistance can be reduced and the reliability of the inductor can be improved. Furthermore, since the cross-sectional area of ​​the current path at the connection portion can be increased, the temperature rise that occurs when current is passed through the inductor can be suppressed and the reliability of the inductor can be improved.

[0043] Next, the locking portion 38 of the electrode member 30 will be described.

[0044] In the following explanation, we will mainly explain the half of inductor 100 on the negative side of the X-axis, but the half of inductor 100 on the positive side of the X-axis has a similar structure to the half of inductor 100 on the negative side of the X-axis, and the same explanation applies.

[0045] As shown in FIG. 2, the electrode member 30 has a locking portion 38 along the side surface 13d. More specifically, the locking portion 38 is connected to the bottom plate portion 31 and is arranged along the side surface 13d of the magnetic core 10. The locking portion 38 extends from the bottom plate portion 31 toward the top surface 12 and is arranged between the tip of the protrusion 131d, which is the outermost of the side surfaces 13d of the magnetic core 10 when viewed from the X-axis direction, and the innermost part of the side surfaces 13d. The locking portion 38 is arranged corresponding to one of the four side surfaces 13d. An opening 38a is formed in the locking portion 38. The opening 38a is a rectangular through-hole that penetrates the electrode member 30 in the thickness direction (here, the Y-axis direction). The opening 38a corresponds to the protrusion 131d formed on the side surface 13d, and the locking portion 38 is arranged so that the protrusion 131d penetrates the opening 38a. The locking portion 38 may be fixed to the magnetic core 10 via an adhesive. Such locking portion 38 is used to fix the magnetic core 10 and the electrode member 30 by locking the side surface of the protrusion 131d on the top surface 12 side with the inner surface of the opening 38a on the top surface 12 side (facing the bottom surface 11 side). In other words, the electrode member 30 is fixed to the magnetic core 10 by locking the protrusion 131d with the locking portion 38, welding at the connection portion, and (possibly by bonding the bottom plate portion 31, the side plate portion 32, and the locking portion 38). For example, as shown in the figure, such a protrusion 131d is formed closer to the bottom surface 11 than the center of the magnetic core 10. In this way, the magnetic core 10 having the protrusion 131d and the electrode member 30 having the locking portion 38 can firmly fix the electrode member 30 and the magnetic core 10.

[0046] [Inductor manufacturing method] Next, a description will be given of a method for manufacturing the above-described inductor 100. The inductor according to the embodiment is manufactured as follows. Note that the method for manufacturing the inductor 100 is not limited to the following example.

[0047] In the manufacturing method of the inductor 100, a step of pressure molding the magnetic core 10 together with the coil element is first carried out. This step is carried out by placing the coil element having the coil portion 21 in a molding die and pressure molding the powder magnetic core. The pressure during pressure molding is, for example, 5 ton / cm. 2 The heat curing temperature is, for example, 185° C. After pressure molding, exposed lead portion 22 that is not covered by magnetic core 10 protrudes, for example, perpendicular to side surface 13 c of magnetic core 10. Lead portion 22 is irradiated with, for example, a laser beam, and the insulating coating is removed.

[0048] Next, a process is performed in which the metal material plate is punched and bent to prepare the electrode member 30 having the bottom plate portion 31, the side plate portion 32, the protruding plate portion 35, and the locking portion 38. In this process, the first protruding plate portion 36 and the second protruding plate portion 37 of the side plate portion 32 are bent in advance in a direction away from the side surface 13c of the magnetic core 10.

[0049] FIG. 5 is a diagram showing an example of a manufacturing process for the protruding plate portion 35 of the inductor 100. In FIG.

[0050] First, as shown in Fig. 5(a), a metal material plate is punched out. At this time, for example, an inverted U-shape is punched out so that a region T2 that will become the second protruding plate portion 37 in a subsequent process remains.

[0051] 5(b), the region T2 is then bent in a later process in the opposite direction to the surface where the side plate 32 abuts against the side surface 13c, thereby forming a second protruding plate 37 standing upright from the side plate 32. The through opening 33 is formed in the space created by the bending process. The bending line (crease) L2 of the second protruding plate 37 substantially coincides with the inner wall 33b of the through opening 33 on the bottom surface 11 side.

[0052] Next, as shown in FIG. 5(c), the region T1 that will become the first protruding plate portion 36 in the future is bent in the same direction as the second protruding plate portion 37 to form the first protruding plate portion 36. The first protruding plate portion 36 is formed by using the region T1 that is located closer to the top surface 12 than the side plate portion 32. A bending line (crease) L1 of the first protruding plate portion 36 substantially coincides with the inner wall 33a of the through opening 33 on the top surface 12 side. Note that the step shown in FIG. 5(c) may be performed before the step of FIG. 5(b).

[0053] Next, a step of arranging the electrode member 30 on the magnetic core 10 is performed as shown in FIG. 1 . First, the lead-out portion 22 is inserted into the through-opening 33 of the side plate portion 32, and the side plate portion 32 is arranged along the side surface 13c of the magnetic core 10. Then, the bottom plate portion 31 is bent so as to be along the bottom surface 11 of the magnetic core 10. Then, the locking portion 38 is bent so as to be along the other side surface 13d of the magnetic core 10. At this time, the lead-out portion 22 is inserted into the through-opening 33 of the side plate portion 32, and the lead-out portion 22 comes into contact with the first protruding plate portion 36 and the second protruding plate portion 37. Furthermore, the protruding portion 131d is inserted into the opening 38a of the locking portion 38. Furthermore, when any or all of the bottom plate portion 31, side plate portion 32, and locking portion 38 of the electrode member 30 are to be bonded to the magnetic core 10, in this step, a thermosetting adhesive that is viscous when uncured is applied to the portion where the electrode member 30 and the magnetic core 10 come into contact. The adhesive is not cured in this step, but will be cured in a later step described below.

[0054] Next, a process is performed in which each protruding plate portion 35 is welded to the drawer portion 22 by laser seam welding or the like. Specifically, connection portions are formed along each of the drawer top surface 22a and the drawer bottom surface 22b of the drawer portion 22. The weld marks ws formed on the connection portions have a circular shape, and are formed, for example, by rotating the laser beam spot at a predetermined radius.

[0055] Next, the electrode member 30 is bent so that the locking portions 38 of the electrode member 30 lock onto the protrusions 131d of the magnetic core 10. In this step, as shown in FIG. 1 , when the magnetic core 10 is pressure-molded, a bottom recess 11a that is recessed toward the inside of the magnetic core 10 may be formed in advance at a position on the bottom surface 11 that overlaps the bottom plate portion 31, and the bottom plate portion 31 may be bent so that it fits into this bottom recess 11a. This forms a bottom crimped portion 31a in the bottom plate portion 31, thereby narrowing the electrode member 30. By narrowing the electrode member 30 in this way, the entire electrode member 30 is fastened to the magnetic core 10, and the locking portions 38 of the electrode member 30 are firmly locked onto the protrusions 131d of the magnetic core 10, firmly fixing the electrode member 30 to the magnetic core 10. Furthermore, if the electrode member 30 and the magnetic core 10 are to be bonded together, a heat treatment to harden the adhesive is performed after this step. In this manner, the inductor 100 is manufactured.

[0056] [First Modification of the Embodiment] An inductor 100A according to a first modification of the embodiment will be described below. In this example, the first protruding plate portion 36 has an opening (protruding plate opening 36h) that connects to the through opening 33.

[0057] Fig. 6A is a perspective view of lead-out portion 22 and protruding plate portion 35 of inductor 100A according to Modification 1 of the embodiment. Fig. 6B is a view showing a state before lead-out portion 22 and protruding plate portion 35 of inductor 100A are welded.

[0058] Similar to the first embodiment, the inductor 100A of the first modification includes a magnetic core 10, a coil element having a coil portion 21 and a lead-out portion 22, and an electrode member 30 serving as an external terminal (not shown). The electrode member 30 includes a bottom plate portion 31, a side plate portion 32, and a plurality of protruding plate portions 35. The side plate portion 32 has a through opening 33 that penetrates in the thickness direction. The lead-out portion 22 penetrates the through opening 33 and is in contact with the plurality of protruding plate portions 35. The plurality of protruding plate portions 35 are welded to the lead-out portion 22.

[0059] The first protruding plate portion 36 of the inductor 100A of the first modification has a protruding plate opening 36h that penetrates in the thickness direction. The protruding plate opening 36h is located on the side plate portion 32 side when viewed from the center of the first protruding plate portion 36, and is connected to the through opening 33. Due to the protruding plate opening 36h, when the inductor 100A is viewed from the top surface 12 side in the Z-axis direction, a portion of the drawn-out top surface 22a of the drawn-out portion 22 is exposed. The width of the protruding plate opening 36h when viewed from the Z-axis direction is the same as the width of the through opening 33. The opening length of the protruding plate opening 36h in the Y-axis direction is shorter than the drawn-out length of the drawn-out portion 22.

[0060] FIG. 7 is a diagram showing an example of a manufacturing process for the protruding plate portion 35 of the inductor 100A.

[0061] First, as shown in Fig. 7(a), a metal material plate is punched to have a predetermined shape so that a region T2 that will become the second protruding plate portion 37 in a subsequent process remains.

[0062] 7(b), the region T2 is bent to form a second protruding plate portion 37 standing upright from the side plate portion 32. An opening 33i is formed in the space created by the bending process. This opening 33i is composed of the through opening 33 and the protruding plate opening 36h, which will be shown in the next step.

[0063] Next, as shown in FIG. 7C, the region T1a, which will become the first protruding plate portion 36 in a subsequent process, is bent in the same direction as the second protruding plate portion 37 to form the first protruding plate portion 36. The inner wall of the opening 33i on the top surface 12 side is located closer to the top surface 12 than the inner wall 33a shown in FIG. 5B. Therefore, the bending line L1a is located at a position that intersects with the two side walls connecting the inner wall on the top surface side and the inner wall on the bottom surface side of the opening 33i. Bending the region T1a along this bending line L1a forms the through opening 33 in the side plate portion 32, and the protruding plate opening 36h in the first protruding plate portion 36. By locating the bending line L1a in such a position, the length of the fold line when bending the metal material plate can be shortened. This allows the first protruding plate portion 36 to be bent easily and accurately.

[0064] In the inductor 100A of the first modification, the lead-out portion 22 of the coil element also passes through the through-opening 33 of the side plate portion 32 and contacts the plurality of protruding plate portions 35, which are welded to the lead-out portion 22. This provides the same effect as in the first embodiment.

[0065] [Modification 2 of the embodiment] An inductor 100B according to a second modification of the embodiment will be described. In this example, a part of the first protruding plate portion 36 is bent and arranged so as to fit along the side surface of the lead-out portion 22 (lead-out side surface 22c).

[0066] Fig. 8A is a perspective view of lead-out portion 22 and protruding plate portion 35 of inductor 100B according to Modification 2 of the embodiment. Fig. 8B is a view showing a state before lead-out portion 22 and protruding plate portion 35 of inductor 100B are welded.

[0067] Similar to the first embodiment, the inductor 100B of the second modification includes a magnetic core 10, a coil element having a coil portion 21 and a lead-out portion 22, and an electrode member 30 serving as an external terminal (not shown). The electrode member 30 includes a bottom plate portion 31, a side plate portion 32, and a plurality of protruding plate portions 35. The side plate portion 32 has a through opening 33 that penetrates in the thickness direction. The lead-out portion 22 penetrates the through opening 33 and is in contact with the plurality of protruding plate portions 35. The plurality of protruding plate portions 35 are welded to the lead-out portion 22.

[0068] The first protruding plate portion 36 of the second modification has a protruding plate main body 36m arranged along the drawer top surface 22a, and a plurality of side portions 36n arranged from the protruding plate main body 36m along the drawer side surface 22c of the drawer portion 22. Each of the plurality of side portions 36n is provided on the tip end portion 35e side of the first protruding plate portion 36. For example, the plurality of side portions 36n are formed by bending the protruding plate main body 36m as a base so that they fit along the drawer side surface 22c. The protruding plate main body 36m is welded to the drawer top surface 22a, and the side portions 36n are welded to the drawer side surface 22c of the drawer portion 22.

[0069] By providing the side portions 36n, the length of the connection portion formed by welding each protruding plate portion 35 to the lead portion 22 can be further increased. This allows the cross-sectional area of ​​the connection portion connecting the coil element and the electrode member 30 to be further increased, thereby improving the reliability of the connection between the coil element and the electrode member 30. Furthermore, since the cross-sectional area of ​​the current path in the connection portion can be increased, the DC resistance can be reduced and the reliability of the inductor can be improved. Furthermore, since the cross-sectional area of ​​the current path in the connection portion can be increased, the temperature rise that occurs when current is passed through the inductor can be suppressed and the reliability of the inductor can be improved.

[0070] [Third Modification of the Embodiment] A description will be given of an inductor 100C according to a third modification of the embodiment. In this example, the width of the tip portion 35e of the first protruding plate portion 36 is narrower than the width of the base portion 35f when viewed from the Y-axis direction.

[0071] Fig. 9A is a perspective view of lead-out portion 22 and protruding plate portion 35 of inductor 100C according to Modification 3 of the embodiment. Fig. 9B is a view showing a state before lead-out portion 22 and protruding plate portion 35 of inductor 100C are welded.

[0072] Similar to the first embodiment, the inductor 100C of the third modification includes a magnetic core 10, a coil element having a coil portion 21 and a lead-out portion 22, and an electrode member 30 serving as an external terminal (not shown). The electrode member 30 includes a bottom plate portion 31, a side plate portion 32, and a plurality of protruding plate portions 35. The side plate portion 32 has a through opening 33 that penetrates in the thickness direction. The lead-out portion 22 penetrates the through opening 33 and is in contact with the plurality of protruding plate portions 35. The plurality of protruding plate portions 35 are welded to the lead-out portion 22.

[0073] In the first protruding plate portion 36 of the third modification, the width of the tip portion 35e, which is farther from the side plate portion 32, is narrower than the width of the base portion 35f, which is closer to the side plate portion 32. For example, the width of the tip portion 35e is 0.5 to 0.8 times the width of the base portion 35f. The width of the first protruding plate portion 36 gradually narrows from the base portion 35f toward the tip portion 35e. The width of the base portion 35f of the first protruding plate portion 36 is wider than the width of the second protruding plate portion 37. The width of the tip portion 35e of the first protruding plate portion 36 is the same as the width of the tip portion 35e of the second protruding plate portion 37.

[0074] As described above, narrowing the width of the tip 35e of the first protruding plate portion 36 makes it easier for the tip 35e of the first protruding plate portion 36 to melt when welding the first protruding plate portion 36 to the lead-out portion 22. This allows welding to be performed without applying excessive heat to the first protruding plate portion 36, thereby suppressing heat transfer to the magnetic core 10. This prevents thermal degradation of the inductor 100C.

[0075] [Fourth Modification of the Embodiment] A description will be given of an inductor 100D according to a fourth modification of the embodiment. In this example, the width of the tip 35e of the protruding plate portion 35 when viewed from the Y-axis direction is narrower than the width of the tip 22e of the lead portion 22.

[0076] Fig. 10A is a perspective view of lead-out portion 22 and protruding plate portion 35 of inductor 100D according to Modification 4 of the embodiment. Fig. 10B is a view showing a state before lead-out portion 22 and protruding plate portion 35 of inductor 100D are welded.

[0077] Similar to the first embodiment, the inductor 100D of the fourth modification includes a magnetic core 10, a coil element having a coil portion 21 and a lead-out portion 22, and an electrode member 30 serving as an external terminal (not shown). The electrode member 30 includes a bottom plate portion 31, a side plate portion 32, and a plurality of protruding plate portions 35. The side plate portion 32 has a through opening 33 penetrating in the thickness direction. The lead-out portion 22 passes through the through opening 33 and is in contact with the plurality of protruding plate portions 35. The plurality of protruding plate portions 35 are welded to the lead-out portion 22.

[0078] In the two protruding plate portions 35 of Modification 4, the width of the tip portion 35e away from the side plate portion 32 is narrower than the width of the tip portion 22e of the lead-out portion 22. For example, the width of the tip portion 35e is 0.8 times or more but less than 1 times the width of the tip portion 22e. Furthermore, the width of each protruding plate portion 35 gradually narrows from the base portion 35f toward the tip portion 35e. Note that, although the width of the base portion 35f of the second protruding plate portion 37 is narrower than the width of the base portion 35f of the first protruding plate portion 36, the width still gradually narrows from the base portion 35f toward the tip portion 35e. The width of the tip portion 35e of the first protruding plate portion 36 is the same as the width of the tip portion 35e of the second protruding plate portion 37.

[0079] As described above, narrowing the width of the tip 35e of the protruding plate portion 35 makes it easier for the tip 35e of the protruding plate portion 35 to melt when welding the first protruding plate portion 36 to the lead portion 22. This allows welding to be performed without applying excessive heat to the protruding plate portion 35, thereby preventing heat from being transferred to the magnetic core 10. This prevents thermal degradation of the inductor 100D.

[0080] [Fifth Modification of the Embodiment] An inductor 100E according to a fifth modification of the embodiment will be described. In this example, the first contact surface 36a of the first protruding plate portion 36 and the second contact surface 37b of the second protruding plate portion 37 are configured on the same surface of the electrode member 30.

[0081] Fig. 11A is a perspective view of lead-out portion 22 and protruding plate portion 35 of inductor 100E according to Modification 5 of the embodiment. Fig. 11B is a view showing a state before lead-out portion 22 and protruding plate portion 35 of inductor 100E are welded.

[0082] Similar to the first embodiment, the inductor 100E of the fifth modification includes a magnetic core 10, a coil element having a coil portion 21 and a lead-out portion 22, and an electrode member 30 serving as an external terminal (not shown). The electrode member 30 includes a bottom plate portion 31, a side plate portion 32, and a plurality of protruding plate portions 35. The side plate portion 32 has a through opening 33 penetrating in the thickness direction. The lead-out portion 22 passes through the through opening 33 and is in contact with the plurality of protruding plate portions 35. The plurality of protruding plate portions 35 are welded to the lead-out portion 22.

[0083] In the fifth modification, the first contact surface 36a of the first protruding plate portion 36, which contacts the top surface 22a, and the second contact surface 37b of the second protruding plate portion 37, which contacts the bottom surface 22b, are formed on the same surface of the electrode member 30. For example, if the plate-shaped electrode member 30 has a first surface, which is one of the two main surfaces of the plate-shaped member, and a second surface, which is the other, and the first surface is in contact with the side surface 13c of the magnetic core 10, the first contact surface 36a is formed on a part of the first surface, and the second contact surface 37b is formed on another part of the first surface. That is, the first contact surface 36a and the second contact surface 37b are formed on the same first surface of the electrode member 30.

[0084] FIG. 12 is a diagram showing an example of a manufacturing process for the protruding plate portion of the inductor 100E.

[0085] First, as shown in Fig. 12(a), a metal material plate is punched. At this time, punching is performed in, for example, an H-shape so that a region T1b that will become the first protruding plate portion 36 and a region T2 that will become the second protruding plate portion 37 in a subsequent process remain.

[0086] 12(b), the above-mentioned regions T1b and T2 are then bent in a later process in the direction opposite to the surface where the side plate portion 32 abuts against the side surface 13c, thereby forming the first protruding plate portion 36 and the second protruding plate portion 37 standing upright from the side plate portion 32. Furthermore, the through opening 33 is formed in the space freed by the bending process. The bending line L1b of the first protruding plate portion 36 substantially coincides with the inner wall 33a of the through opening 33 on the top surface 12 side, and the bending line L2 of the second protruding plate portion 37 substantially coincides with the inner wall 33b of the through opening 33 on the bottom surface 11 side.

[0087] In this way, by configuring the first contact surface 36a and the second contact surface 37b on the same surface of the electrode member 30, it is possible to easily and accurately bend the first protruding plate portion 36 and the second protruding plate portion 37. Furthermore, for example, the first protruding plate portion 36 and the second protruding plate portion 37 can be bent simultaneously using a punch or the like, which simplifies the manufacturing process.

[0088] [Sixth Modification of the Embodiment] An inductor 100F according to a sixth modification of the embodiment will be described. In this example, the protruding plate portion 35 has the same configuration as the fifth modification, and a part of the side plate portion 32 is raised away from the side surface 13c of the magnetic core 10.

[0089] Fig. 13A is a perspective view of lead-out portion 22 and protruding plate portion 35 of inductor 100F according to Modification 6 of the embodiment. Fig. 13B is a view showing a state before lead-out portion 22 and protruding plate portion 35 of inductor 100F are welded.

[0090] Similar to the fifth modification, the inductor 100F of the sixth modification includes a magnetic core 10, a coil element having a coil portion 21 and a lead-out portion 22, and an electrode member 30 serving as an external terminal (not shown). The electrode member 30 includes a bottom plate portion 31, a side plate portion 32, and a plurality of protruding plate portions 35. The side plate portion 32 has a through opening 33 penetrating in the thickness direction. The lead-out portion 22 passes through the through opening 33 and is in contact with the plurality of protruding plate portions 35. The plurality of protruding plate portions 35 are welded to the lead-out portion 22.

[0091] Fig. 14 is a side view of the side plate portion 32 of the inductor 100F, showing the side plate portion 32 as viewed from the X-axis direction.

[0092] As shown in FIG. 14, the side plate portion 32 of the electrode member 30 has multiple raised portions 32g that rise away from the side surface 13c of the magnetic core 10. The multiple raised portions 32g are provided on both outer sides of the side surface (drawer side surface 22c) of the drawer portion 22. A space is formed between the raised portions 32g and the side surface 13c. For example, the raised portions 32g have an inclination angle α1 of 45° or more and less than 80° with respect to the side surface 13c. The raised height of the raised portions 32g is lower than the protruding height of the protruding plate portion 35.

[0093] FIG. 15 is a diagram showing an example of a manufacturing process for the side plate portion 32 of the inductor 100F.

[0094] First, as shown in Fig. 15(a), a metal material plate is punched. At this time, similar to Modification 5, punching is performed to a predetermined shape so as to leave a region T1b that will become the first protruding plate portion 36 and a region T2 that will become the second protruding plate portion 37 in a subsequent process. Note that in Modification 6, the lengths of region T1b and region T2 are longer in the Z-axis direction, which is the direction from the bottom surface 11 toward the top surface 12, than in Modification 5.

[0095] Next, as shown in FIG. 15(b), the above-mentioned regions T1b and T2 are bent in a later process toward the opposite side of the surface where the side plate portion 32 abuts against the side surface 13c, thereby forming the first protruding plate portion 36 and the second protruding plate portion 37 standing upright from the side plate portion 32. Furthermore, an opening 33j is formed in the space freed by the bending process. At this point, the opening 33j of Modification 6 is longer in the Z-axis direction than the through opening 33 of Modification 5. Furthermore, the longer length of the opening 33j makes the protruding lengths of the first protruding plate portion 36 and the second protruding plate portion 37 longer than those of Modification 5.

[0096] 15(c), side plate portions 32 located on both outer sides of the side wall connecting the inner wall on the top surface side and the inner wall on the bottom surface side of opening 33j are formed using a curved mold 99, and side plate portions 32 are slid along the surface direction (along the Z-axis direction). As a result, side plate portions 32 formed using mold 99 rise, and raised portions 32g are formed on both outer sides of drawer side surfaces 22c of drawer portion 22.

[0097] As in the sixth modification, by providing the protruding portion 32g on the side plate portion 32, it is possible to increase the protruding length of each of the first protruding plate portion 36 and the second protruding plate portion 37. This makes it possible to prevent the area of ​​the protruding plate portion 35 welded to the draw-out portion 22 from becoming smaller. This makes it possible to prevent a decrease in the reliability of the connection between the draw-out portion 22 and the protruding plate portion 35.

[0098] FIG. 16 is a diagram showing another example of the side plate portion 32 of the sixth modified example of the embodiment.

[0099] In the example shown in FIG. 16, the protruding portion 32g has an inclination angle α2 of 80° or more with respect to the side surface 13c of the magnetic core 10. The inclination angle α2 is preferably 80° or more and 90° or less. By providing the protruding portion 32g on the side plate portion 32 in this manner, the protruding length of each of the first protruding plate portion 36 and the second protruding plate portion 37 can be further increased. This prevents the area of ​​the protruding plate portion 35 welded to the lead-out portion 22 from being reduced. This prevents a decrease in the reliability of the connection between the lead-out portion 22 and the protruding plate portion 35.

[0100] FIG. 17 is a diagram showing another example of the side plate portion 32 of the sixth modified example of the embodiment.

[0101] In the example shown in FIG. 17 , the raised portion 32g has a portion that gradually bulges from the side surface 13c of the magnetic core 10. For example, when viewed in cross section, the raised portion 32g has a curved shape resembling the Greek letter omega (Ω). Between the base and tip of the raised portion 32g, the raised portion 32g gradually bulges with increasing distance from the base and gradually shrinks from the intermediate portion between the base and tip toward the tip. The base of the raised portion 32g has an inclination angle α3 of 90° or more relative to the side surface 13c of the magnetic core 10. By providing the raised portion 32g on the side plate portion 32 in this manner, the protruding lengths of the first protruding plate portion 36 and the second protruding plate portion 37 can be further increased. This prevents the area of ​​the protruding plate portion 35 that is welded to the lead-out portion 22 from being reduced. This prevents a decrease in the reliability of the connection between the lead-out portion 22 and the protruding plate portion 35.

[0102] [Effects, etc.] As described above, inductor 100 according to this embodiment includes magnetic core 10 having bottom surface 11, top surface 12, and side surfaces 13a, 13b, 13c, and 13d connected to bottom surface 11 and top surface 12; a coil element having coil portion 21 embedded in magnetic core 10 and lead-out portion 22 connected to an end of coil portion 21 and extending from a side surface (e.g., side surface 13c) to the outside of magnetic core 10; and plate-shaped electrode member 30 disposed on side surface 13c and electrically connected to the coil element via lead-out portion 22. Electrode member 30 includes side plate portion 32 disposed along side surface 13c from which lead-out portion 22 extends, and multiple protruding plate portions 35 protruding from side plate portion 32 in a direction away from side surface 13c. Side plate portion 32 has through opening 33 penetrating through side plate portion 32 in a thickness direction. Lead-out portion 22 penetrates through through opening 33 and is in contact with multiple protruding plate portions 35. The plurality of protruding plate portions 35 are welded to the drawer portion 22 .

[0103] This makes it possible to increase the length of the connection formed by welding each protruding plate portion 35 to the lead-out portion 22. This allows the cross-sectional area of ​​the connection portion connecting the coil element and the electrode member 30 to be increased, thereby improving the reliability of the connection between the coil element and the electrode member 30. Furthermore, since the cross-sectional area of ​​the current path at the connection portion can be increased, the DC resistance can be reduced and the reliability of the inductor can be improved. Furthermore, since the cross-sectional area of ​​the current path at the connection portion can be increased, the temperature rise that occurs when current is passed through the inductor can be suppressed and the reliability of the inductor can be improved.

[0104] Furthermore, the plurality of protruding plate portions 35 may be parallel to the bottom surface 11 and face each other with the drawer portion 22 therebetween.

[0105] This allows each of the plurality of protruding plate portions 35 to be reliably brought into contact with the lead portion 22. This makes it possible to improve the reliability of the connection between the coil element and the electrode member 30.

[0106] Furthermore, each of the plurality of protruding plate portions 35 may rise from a part of the boundary area between the side plate portion 32 and the through opening 33 .

[0107] This allows the multiple protruding plate portions 35 to be disposed near the lead-out portion 22 that passes through the through opening 33, and ensures reliable contact with the lead-out portion 22. This improves the reliability of the connection between the coil element and the electrode member 30.

[0108] The plurality of protruding plate portions 35 include a first protruding plate portion 36 and a second protruding plate portion 37 located closer to the bottom surface 11 than the first protruding plate portion 36. The drawer portion 22 has a rectangular cross section, and includes a drawer top surface 22a parallel to the top surface 12, and a drawer bottom surface 22b located closer to the bottom surface 11 than the drawer top surface 22a. The first protruding plate portion 36 may be welded to the drawer top surface 22a, and the second protruding plate portion 37 may be welded to the drawer bottom surface 22b.

[0109] According to this structure, the first protruding plate portion 36 and the second protruding plate portion 37 can be reliably welded to the lead portion 22. This improves the reliability of the connection between the coil element and the electrode member 30.

[0110] The first protruding plate portion 36 may have a protruding plate opening 36h that is connected to the through opening 33 of the side plate portion 32.

[0111] This allows, for example, the first protruding plate portion 36 to be easily and accurately bent, thereby ensuring that the first protruding plate portion 36 is in reliable contact with the lead portion 22. This improves the reliability of the connection between the coil element and the electrode member 30.

[0112] The first protruding plate portion 36 has a protruding plate main body 36m arranged along the drawer top surface 22a, and a plurality of side portions 36n arranged from the protruding plate main body 36m along the side surface (drawer side surface 22c) of the drawer portion 22. The protruding plate main body 36m may be welded to the drawer top surface 22a, and the side portions 36n may be welded to the side surface (drawer side surface 22c) of the drawer portion 22.

[0113] The provision of the side portions 36n described above can further increase the length of the connection portion formed by welding each protruding plate portion 35 to the lead portion 22. This can further increase the cross-sectional area of ​​the connection portion connecting the coil element and the electrode member 30, thereby improving the reliability of the connection between the coil element and the electrode member 30.

[0114] Furthermore, the width of the tip portion 35e of the first protruding plate portion 36, which is away from the side plate portion 32, may be narrower than the width of the base portion 35f, which is closer to the side plate portion 32.

[0115] By narrowing the width of the tip 35e of the first protruding plate 36 in this manner, for example, the tip 35e of the first protruding plate 36 can be made more easily melted when welding the first protruding plate 36 to the lead-out portion 22. This allows welding to be performed without applying excessive heat to the first protruding plate 36, thereby suppressing heat transfer to the magnetic core 10. This prevents thermal degradation of the inductor 100C.

[0116] Furthermore, the width of the tip 35 e of each of the plurality of protruding plate portions 35 away from the side plate portion 32 may be narrower than the width of the tip 22 e of the lead-out portion 22 .

[0117] In this way, narrowing the width of the tip 35e of the protruding plate portion 35 makes it easier to melt the tip 35e of the protruding plate portion 35 when welding the first protruding plate portion 36 to the lead portion 22. Therefore, welding can be performed without applying excessive heat to the protruding plate portion 35, and heat transfer to the magnetic core 10 can be suppressed. This suppresses thermal degradation of the inductor 100D.

[0118] The length of the protruding plate portion 35 protruding from the side plate portion 32 may be 1.5 times or more the plate thickness of the protruding plate portion 35.

[0119] This allows the fusion zone to be enlarged when the multiple protruding plate portions 35 and the lead portion 22 are welded, thereby increasing the connection area. Furthermore, the cross-sectional area of ​​the current path at the connection portion can be increased, thereby reducing DC resistance and improving the reliability of the inductor. Furthermore, the cross-sectional area of ​​the current path at the connection portion can be increased, thereby suppressing temperature rise when current is applied to the inductor, thereby improving the reliability of the inductor.

[0120] In addition, the first contact surface 36a of the first protruding plate portion 36 that contacts the drawer top surface 22a and the second contact surface 37b of the second protruding plate portion 37 that contacts the drawer bottom surface 22b may be formed by the same surface of the electrode member 30.

[0121] By configuring the first contact surface 36a and the second contact surface 37b on the same surface of the electrode member 30 in this manner, for example, the bending of the first protruding plate portion 36 and the second protruding plate portion 37 can be easily and accurately performed. Therefore, the first protruding plate portion 36 can be reliably brought into contact with the lead portion 22. This improves the reliability of the connection between the coil element and the electrode member 30. Furthermore, the bending of the first protruding plate portion 36 and the second protruding plate portion 37 can be performed simultaneously, simplifying the manufacturing process.

[0122] Furthermore, the side plate portion 32 of the electrode member 30 may have protrusions 32g that rise away from the side surface 13c of the magnetic core 10 on both outer sides of the side surface of the lead portion 22 (lead side surface 22c).

[0123] In this way, by providing the protruding portion 32g on the side plate portion 32, it is possible to increase the protruding length of each of the first protruding plate portion 36 and the second protruding plate portion 37. This makes it possible to prevent the area of ​​the protruding plate portion 35 that is welded to the lead-out portion 22 from becoming smaller. This makes it possible to prevent a decrease in the reliability of the connection between the coil element and the electrode member 30.

[0124] Furthermore, the raised portion 32g may have an inclination angle of 80° or more with respect to the side surface 13c.

[0125] In this way, by providing the protruding portion 32g having an inclination angle α1 of 80° or more, it is possible to increase the protruding length of each of the first protruding plate portion 36 and the second protruding plate portion 37. This makes it possible to prevent the area of ​​the protruding plate portion 35 welded to the lead-out portion 22 from becoming smaller. This makes it possible to prevent a decrease in the reliability of the connection between the coil element and the electrode member 30.

[0126] Furthermore, the raised portion 32g may have a portion that gradually bulges out from the side surface 13c.

[0127] By providing the protruding portion 32g having such a bulging portion, it is possible to increase the protruding length of each of the first protruding plate portion 36 and the second protruding plate portion 37. This makes it possible to prevent the area of ​​the protruding plate portion 35 welded to the lead-out portion 22 from becoming smaller. This makes it possible to prevent a decrease in the reliability of the connection between the coil element and the electrode member 30.

[0128] (Other embodiments, etc.) While the inductors and the like according to the embodiments and modifications of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and modifications. As long as they do not deviate from the gist of the present disclosure, various modifications that would occur to a person skilled in the art to the embodiments and modifications, as well as other forms constructed by combining some of the components of the embodiments and modifications, are also included within the scope of the present disclosure.

[0129] In the above embodiment, the bottom plate portion 31, the side plate portion 32, the first protruding plate portion 36, the second protruding plate portion 37, and the locking portion 38 of the electrode member 30 are formed by processing a single member made of the same material, but this is not limiting. For example, the electrode member 30 may be formed by connecting the bottom plate portion 31, the side plate portion 32, the first protruding plate portion 36, the second protruding plate portion 37, and the locking portion 38, which are made of different members.

[0130] In the above embodiment, the coil portion 21 and the lead-out portion 22 of the coil element are formed by processing a single member made of the same material, but this is not limiting. The coil element may be formed by connecting the coil portion 21 and the lead-out portion 22 made of different members.

[0131] In the above embodiment, the conductor wire has a rectangular cross section, but is not limited thereto. The conductor wire may have a circular cross section, and at least a portion of the lead portion 22 may be flattened to facilitate connection with the electrode member 30.

[0132] In the above embodiment, the lead-out portion 22 is drawn out from a position closer to the bottom surface 11 than the center of the side surface 13c, but this is not limiting. The lead-out portion 22 may be drawn out from a position closer to the top surface 12 than the center of the side surface 13c.

[0133] The present disclosure also includes, for example, electrical appliances or electrical circuits using the above-described inductor. Examples of electrical appliances include power supply devices equipped with the above-described inductor and various devices equipped with such power supply devices. [Industrial Applicability]

[0134] INDUSTRIAL APPLICABILITY The inductor according to the present disclosure is useful as an inductor used in various devices and equipment. [Explanation of symbols]

[0135] 10 magnetic core 11 Bottom 11a Bottom recess 12 Top 13a, 13b, 13c, 13d side 21 Coil section 22 Drawer section 22a Drawer top 22b Drawer bottom 22c Drawer Side 22e Tip 30 Electrode material 31 Bottom plate part 31a Bottom caulking part 32 Side plate part 32g ridge 33 Through opening 33a, 33b inner wall 33i, 33j opening 35 Projecting plate part 35e Tip 35f base 36 First protruding plate portion 36a First contact surface 36h protruding plate opening 36m protruding plate body 36n Side part 37 Second protruding plate portion 37b Second contact surface 38 Locking part 38a aperture 99 Molds 100, 100A, 100B, 100C, 100D, 100E, 100F inductors 131d Convex part L1, L1a, L1b, L2 bending lines ws welding marks T1, T1a, T1b, T2 region α1, α2, α3 Tilt angle

Claims

1. a magnetic core having a bottom surface, a top surface, and a side surface connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and led out from the side surface to the outside of the magnetic core; a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead-out portion, the electrode member has a side plate portion disposed along the side surface from which the lead portion is led out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, The side plate portion has a through opening that penetrates the side plate portion in a thickness direction, The lead portion passes through the through opening and contacts the plurality of protruding plate portions, the plurality of protruding plate portions are welded to the lead-out portion, the plurality of protruding plate portions are parallel to the bottom surface and face each other with the drawer portion therebetween, the plurality of protruding plate portions include a first protruding plate portion and a second protruding plate portion located closer to the bottom surface than the first protruding plate portion, The drawer portion has a rectangular cross section, a drawer top surface parallel to the top surface, and a drawer bottom surface located closer to the bottom surface than the drawer top surface, The first protruding plate portion is in contact with the top surface of the drawer, and the second protruding plate portion is in contact with the bottom surface of the drawer, a first contact surface of the first protruding plate portion that contacts the top surface of the drawer and a second contact surface of the second protruding plate portion that contacts the bottom surface of the drawer are formed by different surfaces of the electrode member, the first protruding plate portion is welded to the top surface of the drawer, The second protruding plate portion is welded to the bottom surface of the drawer. Inductor.

2. Each of the plurality of protruding plate portions rises from a part of a boundary region between the side plate portion and the through opening.

10. The inductor of claim 1.

3. The first protruding plate portion has a protruding plate opening that is connected to the through opening of the side plate portion.

3. The inductor according to claim 1 or 2.

4. The protruding length of the protruding plate portion protruding from the side plate portion is 1.5 times or more the plate thickness of the protruding plate portion.

10. The inductor of claim 1.

5. a magnetic core having a bottom surface, a top surface, and a side surface connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and led out from the side surface to the outside of the magnetic core; a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead-out portion, the electrode member has a side plate portion disposed along the side surface from which the lead portion is led out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, The side plate portion has a through opening that penetrates the side plate portion in a thickness direction, The lead portion passes through the through opening and contacts the plurality of protruding plate portions, the plurality of protruding plate portions are welded to the lead-out portion, the plurality of protruding plate portions are parallel to the bottom surface and face each other with the drawer portion therebetween, the plurality of protruding plate portions include a first protruding plate portion and a second protruding plate portion located closer to the bottom surface than the first protruding plate portion, The drawer portion has a rectangular cross section, a drawer top surface parallel to the top surface, and a drawer bottom surface located closer to the bottom surface than the drawer top surface, the first protruding plate portion is welded to the top surface of the drawer, the second protruding plate portion is welded to the bottom surface of the drawer, The first protruding plate portion has a protruding plate main body arranged along the top surface of the drawer, and a plurality of side portions arranged from the protruding plate main body along the side surfaces of the drawer portion, The protruding plate body is welded to the top surface of the drawer, The side portion is welded to a side surface of the drawer portion. Inductor.

6. a magnetic core having a bottom surface, a top surface, and a side surface connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and led out from the side surface to the outside of the magnetic core; a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead-out portion, the electrode member has a side plate portion disposed along the side surface from which the lead portion is led out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, The side plate portion has a through opening that penetrates the side plate portion in a thickness direction, The lead portion passes through the through opening and contacts the plurality of protruding plate portions, the plurality of protruding plate portions are welded to the lead-out portion, Each of the plurality of protruding plate portions rises from a part of a boundary region between the side plate portion and the through opening, the plurality of protruding plate portions include a first protruding plate portion and a second protruding plate portion located closer to the bottom surface than the first protruding plate portion, The drawer portion has a rectangular cross section, a drawer top surface parallel to the top surface, and a drawer bottom surface located closer to the bottom surface than the drawer top surface, the first protruding plate portion is welded to the top surface of the drawer, the second protruding plate portion is welded to the bottom surface of the drawer, The first protruding plate portion has a protruding plate main body arranged along the top surface of the drawer, and a plurality of side portions arranged from the protruding plate main body along the side surfaces of the drawer portion, The protruding plate body is welded to the top surface of the drawer, The side portion is welded to a side surface of the drawer portion. Inductor.

7. a magnetic core having a bottom surface, a top surface, and a side surface connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and led out from the side surface to the outside of the magnetic core; a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead-out portion, the electrode member has a side plate portion disposed along the side surface from which the lead portion is led out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, The side plate portion has a through opening that penetrates the side plate portion in a thickness direction, The lead portion passes through the through opening and contacts the plurality of protruding plate portions, the plurality of protruding plate portions are welded to the lead-out portion, the plurality of protruding plate portions are parallel to the bottom surface and face each other with the drawer portion therebetween, the plurality of protruding plate portions include a first protruding plate portion and a second protruding plate portion located closer to the bottom surface than the first protruding plate portion, The drawer portion has a rectangular cross section, a drawer top surface parallel to the top surface, and a drawer bottom surface located closer to the bottom surface than the drawer top surface, the first protruding plate portion is welded to the top surface of the drawer, the second protruding plate portion is welded to the bottom surface of the drawer, The width of the tip end of the first protruding plate portion away from the side plate portion is narrower than the width of the base end of the first protruding plate portion close to the side plate portion. Inductor.

8. a magnetic core having a bottom surface, a top surface, and a side surface connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and led out from the side surface to the outside of the magnetic core; a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead-out portion, the electrode member has a side plate portion disposed along the side surface from which the lead portion is led out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, The side plate portion has a through opening that penetrates the side plate portion in a thickness direction, The lead portion passes through the through opening and contacts the plurality of protruding plate portions, the plurality of protruding plate portions are welded to the lead-out portion, Each of the plurality of protruding plate portions rises from a part of a boundary region between the side plate portion and the through opening, the plurality of protruding plate portions include a first protruding plate portion and a second protruding plate portion located closer to the bottom surface than the first protruding plate portion, The drawer portion has a rectangular cross section, a drawer top surface parallel to the top surface, and a drawer bottom surface located closer to the bottom surface than the drawer top surface, the first protruding plate portion is welded to the top surface of the drawer, the second protruding plate portion is welded to the bottom surface of the drawer, The width of the tip end of the first protruding plate portion away from the side plate portion is narrower than the width of the base end of the first protruding plate portion close to the side plate portion. Inductor.

9. a magnetic core having a bottom surface, a top surface, and a side surface connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and led out from the side surface to the outside of the magnetic core; a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead-out portion, the electrode member has a side plate portion disposed along the side surface from which the lead portion is led out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, The side plate portion has a through opening that penetrates the side plate portion in a thickness direction, The lead portion passes through the through opening and contacts the plurality of protruding plate portions, the plurality of protruding plate portions are welded to the lead-out portion, The width of the tip end of each of the plurality of protruding plate portions away from the side plate portion is narrower than the width of the tip end of the drawing portion. Inductor.

10. a magnetic core having a bottom surface, a top surface, and a side surface connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and led out from the side surface to the outside of the magnetic core; a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead-out portion, the electrode member has a side plate portion disposed along the side surface from which the lead portion is led out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, The side plate portion has a through opening that penetrates the side plate portion in a thickness direction, The lead portion passes through the through opening and contacts the plurality of protruding plate portions, the plurality of protruding plate portions are welded to the lead-out portion, The side plate portion of the electrode member has protrusions that rise away from the side surface of the magnetic core on both outer sides of the side surface of the lead-out portion. Inductor.

11. a magnetic core having a bottom surface, a top surface, and a side surface connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and led out from the side surface to the outside of the magnetic core; a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead-out portion, the electrode member has a side plate portion disposed along the side surface from which the lead portion is led out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, The side plate portion has a through opening that penetrates the side plate portion in a thickness direction, The lead portion passes through the through opening and contacts the plurality of protruding plate portions, the plurality of protruding plate portions are welded to the lead-out portion, the side plate portion of the electrode member has protruding portions that rise away from the side surface of the magnetic core on both outer sides of the lead-out portion, The raised portion has an inclination angle of 80° or more with respect to the side surface. Inductor.

12. a magnetic core having a bottom surface, a top surface, and a side surface connected to the bottom surface and the top surface; a coil element having a coil portion embedded in the magnetic core and a lead portion connected to an end of the coil portion and led out from the side surface to the outside of the magnetic core; a plate-shaped electrode member disposed on the side surface and electrically connected to the coil element via the lead-out portion, the electrode member has a side plate portion disposed along the side surface from which the lead portion is led out, and a plurality of protruding plate portions protruding from the side plate portion in a direction away from the side surface, The side plate portion has a through opening that penetrates the side plate portion in a thickness direction, The lead portion passes through the through opening and contacts the plurality of protruding plate portions, the plurality of protruding plate portions are welded to the lead-out portion, the side plate portion of the electrode member has protruding portions that rise away from the side surface of the magnetic core on both outer sides of the lead-out portion, The raised portion has a portion that gradually bulges from the side surface. Inductor.

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