JP2009176954A - Magnetic element and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic element, the clearance of which between a drum core and a sleeve core is constant and the DC superposition characteristics of which have been improved, and to provide a method of manufacturing the same. <P>SOLUTION: A magnetic element 1 to be mounted on a substrate includes: a drum core 10 having two flange parts 3 and a winding part 2 surrounded by the two flange parts 3 and around which, a winding 4 wound; and a sleeve core 20 having an inner wall 21 in opposition to at least part of the flange parts 3, wherein in at least one of the flange parts 3 and the inner wall 21, two or more grooves 22 into which the projection part of a jig can be inserted are formed in the direction in which the winding part 2 is erected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a magnetic element that is surface-mounted on a substrate and a method for manufacturing the same.

  In recent years, a closed magnetic circuit type inductor with less magnetic flux leakage has been used in order to increase the mounting density of circuit boards and reduce the size of electronic devices. As a closed magnetic circuit type inductor, there is an inductor in which a winding is wound around a drum core and a sleeve core is disposed in a state of being opposed to the drum core.

  In this type of inductor, it is desirable to keep the gap between the drum core and the sleeve core constant. When the gap between the drum core and the sleeve core is smaller than the predetermined gap, the magnetic flux passing through the core tends to reach a saturated state, causing a problem that a large current cannot flow. On the other hand, when the gap between the drum core and the sleeve core is larger than the predetermined gap, there arises a problem that leakage of magnetic flux to the outside becomes large.

  Therefore, there is a proposal of providing a protrusion on either the outer surface of the flange portion of the drum core or the inner surface of the sleeve core. Since the protrusion comes into contact with the other surface, the gap between the drum core and the sleeve core can be kept constant (see, for example, Patent Document 1).

JP 2002-313635 A

  However, the above-described invention has a problem that saturation is likely to occur at the protruding portion where the drum core and the sleeve core are in contact with each other, and the direct current superimposition characteristic is degraded. Specifically, in the DC superposition characteristic indicating the inductance value when the current is increased, saturation occurs at the contact portion between the drum core and the sleeve core when the energization amount is low. Further, when the energization amount is increased, the saturation is generated twice (or a plurality of times) that the core portion is saturated. As a result, a stable inductance value cannot be obtained with respect to changes in the amount of current.

  Accordingly, an object of the present invention is to solve the above-described problems, that is, to provide a magnetic element in which the gap between the drum core and the sleeve core is constant and the direct current superimposition characteristics are improved, and a method for manufacturing the same.

  In order to achieve such an object, a magnetic element mounted on a substrate, including a drum core having two flange portions, surrounded by the two flange portions and having a winding portion around which a winding is wound, A sleeve core having an inner wall facing at least a part of the part, and at least one of the flange part or the inner wall has two or more grooves into which the convex part of the jig can be inserted, The magnetic element is formed in the standing direction.

  Further, in another invention, in addition to the above-described invention, the connection terminal for connecting the end of the winding and the conductive portion of the substrate is arranged at a position different from the groove of the sleeve core, and other than the connection terminal and the groove And an adhesive is interposed in the gap between the drum core and the sleeve core.

  Further, in another invention, the drum core has two flange portions and is surrounded by the two flange portions and has a winding portion around which the winding is wound, and has an inner wall facing at least a part of the flange portion. A method of manufacturing a magnetic element having two or more grooves formed in a standing direction of a winding portion on at least one of the flange portion and the inner wall, A winding step of winding a winding around the winding portion, and a sleeve core placement step of placing a sleeve core in a jig having two or more projections inserted into the groove with the projections aligned with the grooves; A drum core arranging step for arranging the drum core so as to abut the convex portion, an adhesion step for interposing an adhesive in the gap between the drum core and the sleeve core, and a projecting direction of the convex portion. Drumco And as an integral sleeve core, and a method of manufacturing a magnetic element having a removal step of pulling out.

  ADVANTAGE OF THE INVENTION According to this invention, the clearance gap between a drum core and a sleeve core is constant, and the magnetic element which improved the direct current | flow superimposition characteristic, and its manufacturing method can be provided.

  Hereinafter, an inductor 1 which is an embodiment of a magnetic element of the present invention will be described with reference to the drawings. In the following description, the height direction refers to the Z axis in the drawing, that is, the direction perpendicular to the substrate surface. Furthermore, in the following description, the lower side refers to the side mounted on the substrate, and the upper side refers to the opposite side.

  FIG. 1 is a perspective view showing the overall configuration of an inductor 1 according to an embodiment of the present invention. Further, in each of the drawings other than FIGS. 4 and 5, the winding 4 described later is omitted for simplification of the drawings. FIG. 2 is a top view of the inductor 1 as viewed from above, and FIG. 3 is a side view of the inductor 1 as viewed in the X direction. 4 is a cross-sectional view of the inductor 1 of FIG. 1 cut along a plane extending along the line AA of FIG. 2 and extending in the vertical direction of the drawing. FIG. 5 is a cross-sectional view of the inductor 1 of FIG. It is sectional drawing at the time of cut | disconnecting in the plane which follows the BB line of and extends in the perpendicular direction of a paper surface.

  The inductor 1 is a surface mount type inductor, and includes a drum core 10, a sleeve core 20, a winding 4, and a connection terminal 5.

  The drum core 10 has a winding part 2 and two flange parts 3 provided at both ends of the winding part 2. The winding part 2 has a cylindrical shape, and disc-shaped flange parts 3 are provided at both ends of the winding part 2. As the material of the drum core 10, a magnetic material such as nickel-based ferrite is preferably used.

  For example, the winding portion 2 has a cylindrical shape with a height of 0.5 to 5 mm and a diameter of 1 to 5 mm. A winding 4 made of, for example, a copper fine wire is wound around the outer periphery of the winding portion 2. The end of the winding 4 is connected to a connection terminal 5 described later. The collar part 3 is disk shape whose thickness is 0.3-1.1 mm and diameter is 1-20 mm, for example. The two flange portions 3 have substantially the same size and shape, and are the flange portions 3 having an outer diameter larger than the outer diameter of the winding portion 2, and thus extend outward from the winding portion 2. The drum core 10 is line symmetric with respect to the winding portion 2.

  The sleeve core 20 is preferably composed of a magnetic material such as a nickel-based ferrite core, like the drum core 10 described above. In the present specification, the sleeve core 20 indicates a core disposed around the drum core. In the present embodiment, for example, a so-called ring core that is an annular core having a through hole in a substantially octagonal prism with one side of 0.5 mm to 10 mm can be used as the sleeve core 20. The sleeve core 20 has, for example, a cylindrical through hole with a diameter of 1 mm to 25 mm, and a groove 22 described later is formed on an inner wall 21 formed by the through hole. The through hole of the sleeve core 20 is formed to accommodate the drum core 10 around which the winding 4 is wound.

  The through hole of the sleeve core 20 has a radius larger by Δ than the radius of the outer periphery of the flange portion 3 of the drum core 10. Therefore, in a state where the drum core 10 is disposed in the through hole of the sleeve core 20, the inner wall 21 of the sleeve core 20 and the outer peripheral surface of the flange portion 3 of the drum core 10 face each other with a gap Δ. That is, the outer peripheral surface of the flange 3 of the drum core 10 and the inner wall 21 of the sleeve core 20 are magnetically coupled via a predetermined gap (gap Δ). Note that the gap Δ is, for example, about 0.01 to 3 mm.

  Further, the four grooves 22 provided on the inner wall 21 of the sleeve core 20 are parallel to the extending direction of the winding portion 2 so as to be concave in the direction from the inner wall 21 toward the outer periphery of the sleeve core 20, that is, Stretched in the Z direction. The groove 22 has a substantially semicircular cross section in the XY plane, and the radius of the semicircle, that is, the depth d of the groove is, for example, 0.01 to 2 mm. The groove 22 penetrates from the lower surface of the sleeve core 20 to the upper surface.

  In addition, on the upper surface of the sleeve core 20, for example, an upper surface side recess 24 a having a depth of 0.5 mm to 7.2 mm is formed in a portion of a pair of sides in the diagonal direction among the eight sides of the outer periphery. Is formed. Further, a lower surface side concave portion 24b is formed at a position on the lower side of the sleeve core 20 that overlaps the upper surface side concave portion 24a of the sleeve core 20 in the X-axis direction. The upper surface side concave portion 24a and the lower surface side concave portion 24b are portions for arranging connection terminals 5 to be described later. The lower surface side recess 24 b is formed with a depth equal to or less than the thickness of the lower surface portion 53 of the connection terminal 5. Therefore, when the lower surface side of the inductor 1 is disposed on the substrate, the lower surface portion 53 of the connection terminal 5 can reliably contact the substrate.

  For example, the connection terminal 5 is formed by bending a metal plate having a thickness of about 0.05 mm at two locations substantially perpendicular to the length direction of the connection terminal 5. That is, the connection terminal 5 is formed integrally with the side surface portion 52 and the upper surface portion 51 and the lower surface portion 53 are linearly connected. Further, the side surface portion 52 and the lower surface portion 53 and the side surface portion 52 and the upper surface portion 51 form an angle of about 90 degrees, and both ends of the upper surface portion 51 and the lower surface portion 53 extend in the same direction. A terminal of the winding 4 is electrically connected to the upper surface portion 51 of the connection terminal 5. Since the connection terminal 5 is made of metal, it has conductivity. Therefore, in a state where the inductor 1 is mounted on the substrate, the lower surface portion 53 of the connection terminal 5 comes into contact with the substrate, and the winding 4 and the substrate can be reliably conducted.

  The connection terminal 5 has an upper surface portion 51 in the upper surface side concave portion 24a, a lower surface portion 53 in the lower surface side concave portion 24b, and a side surface portion 52 that is the outer peripheral surface of the sleeve core 20 with an adhesive or the like. The connection terminal 5 is fixed to the sleeve core 20 by being adhered to a portion between the side recess 24b. In addition, this adhesion | attachment should just be at least 1 or more of said 3 places. Further, the end of the winding 4 is electrically connected and fixed to the upper surface side of the upper surface portion 51 of the connection terminal 5 fixed to the sleeve core 20 with solder or the like.

  The structure of the jig 30 for manufacturing the inductor 1 having the above configuration will be described below. FIG. 6 is a top view when the jig 30 is viewed from above. In FIG. 6, a dotted line also shows a place where the drum core 10 and the sleeve core 20 are arranged.

  The jig 30 has a rectangular parallelepiped base 31 and a column 39 as a convex portion. The pedestal 31 is a portion where the inductor 1 is disposed, and any member such as plastic, wood, metal, or the like that is not easily deformed when pressed with a finger can be used. In the present embodiment, the pedestal 31 is a rectangular parallelepiped. However, the shape is not limited to this, and any shape may be used as long as the upper surface is smooth.

  The cylinder 39 as a convex portion is used for determining the arrangement positions of the sleeve core 20 and the drum core 10. Specifically, the positions of the sleeve core 20 and the drum core 10 are determined by bringing the column 39 into contact with the outer peripheral surface of the drum core 10 and the deepest portion of the groove 22 of the sleeve core 20. Therefore, the diameter of the cylinder 39 is substantially equal to the distance obtained by adding the depth d of the groove 22 to the distance Δ between the drum core 10 and the sleeve core 20.

  The cylinder 39 is preferably made of a hard material so that the cylinder 39 is not deformed when the cylinder 39 is brought into contact with the sleeve core 20 or the drum core 10. Further, in order to pull out the column 39 from the gap between the outer periphery of the drum core 10 of the inductor 1 and the groove 22 of the sleeve core 20 in the removal step described later, the surface of the column 39 may be made of a material having a smooth and low frictional resistance. desirable. Further, the cylinder 39 has a diameter that is the same as or smaller than the diameter of the semicircle of the cross section of the groove 22 provided in the sleeve core 20 and is the same as or longer than the distance in the thickness direction of the sleeve core 20. Can be used. As a material suitable for such a cylinder 39, a stainless steel cylinder 39 coated with a fluorine-containing resin or the like can be preferably used.

  The above-described cylinder 39 is fixed to the upper surface of the pedestal 31 so as to be in contact with the outer periphery of the flange portion 3 and the deepest portion of the groove 22 in accordance with the position where the groove 22 of the sleeve core 20 is formed. . The column 39 is erected substantially perpendicularly to the upper surface of the pedestal 31 by, for example, casting, welding, integral molding, or embedding.

  A method for manufacturing inductor 1 according to the present embodiment will be described below. FIG. 7 is a flowchart showing the procedure of the method for manufacturing inductor 1 according to the present embodiment. 8 to 11 are perspective views for illustrating the states of the respective steps of the method for manufacturing the inductor 1 according to the present embodiment.

  First, the drum core 10 and the sleeve core 20 are prepared. The drum core 10 and the sleeve core 20 are generated by forming the magnetic material into the above-described shapes of the drum core 10 and the sleeve core 20 by, for example, press molding or the like, and sintering the magnetic material after molding.

  Further, the connection terminal 5 is formed by punching a metal plate in advance and performing a process such as bending. In addition, as for the terminal 5 for a connection formed at this time, each of the upper surface part 51 and the lower surface part 53 is bend | folded in the same direction from the side part 52 between them.

  Next, as shown in FIG. 8, the formed connection terminal 5 is attached to the upper surface side recess 24a and the lower surface side recess 24b of the sleeve core 20 (step S101: connection terminal bonding step). At that time, the upper surface portion 51 of the connection terminal 5 is attached to the upper surface side concave portion 24 a of the sleeve core 20. Specifically, the upper surface portion 51 of the connection terminal 5 is the upper surface side recess 24a, the lower surface portion 53 is the lower surface side recess 24b, and the side surface 52 is the sleeve core between the upper surface side recess 24a and the lower surface side recess 24b. Adhesion and fixation can be achieved by attaching to the outer peripheral surface of 20 via an adhesive or the like.

  In addition to the attachment of the connection terminal 5, the winding 4 is wound around the winding portion 2 of the drum core 10 by a predetermined number of turns (step S102: winding step). Thereby, although a coil is formed, the terminal of the coil | winding 4 is made into the state which can be pulled out only predetermined.

  First, as shown in FIG. 9, the sleeve core 20 is placed on the jig 30 (step S103: sleeve core placement step). The groove 22 of the sleeve core 20 is the same as the arrangement of the column 39 of the jig 30. Further, since the radius of the cylinder 39 is larger than the radius of the groove 22, the cylinder 39 is inserted while being in contact with the outermost part of the groove 22.

  Next, as shown in FIG. 10, the drum core 10 around which the winding 4 is wound is placed on the jig 30 on which the sleeve core 20 is placed (step S104: drum core placement step). The drum core 10 is disposed so as to be surrounded by four cylinders 39.

  The diameter of the cylinder 39 is approximately Δ larger than the depth of the groove 22. Therefore, the gap between the outer peripheral surface of the drum core 10 that is in contact with and surrounded by the four cylinders 39 and the inner wall surface of the sleeve core 20 in which the deepest portion of the groove 22 is in contact with the four cylinders 39 is Δ To be kept.

  Next, an adhesive is injected into the gap between the drum core 10 and the sleeve core 20 to bond the drum core 10 and the sleeve core 20 (step S105: bonding step). A known adhesive can be used as the adhesive.

  Next, the terminal of the winding 4 is connected to the upper surface portion 51 of the connection terminal 5 (step S106: winding connection step). Specifically, the end of the winding 4 is fixed by soldering or the like.

  Finally, the inductor 1 is removed from the jig 30 (step S107: removal step). Specifically, by pulling up the inductor 1 upward, the cylinder 39 can be removed from the groove 22 and the inductor 1 can be removed from the jig 30.

  As described above, the inductor 1 is formed.

  In the inductor 1 having such a configuration, the gap between the drum core 10 and the sleeve core 20 is constant (Δ in the present embodiment). Moreover, since the drum core 10 and the sleeve core 20 are not in contact with each other by the projection as in the conventional case, the direct current superposition characteristics can be improved.

  Further, by providing the groove on the sleeve core 20 side and not providing the groove 22 on the drum core 10 side, it is possible to prevent the mechanical strength of the flange 3 from being lowered. Since the sleeve core 20 side is thicker in the vertical direction than the flange portion 3, the mechanical strength is hardly lowered even if the groove 22 is provided. That is, the inductor 1 that is not easily broken even when used at a site where vibration or impact is applied can be obtained.

  Further, in this embodiment, the groove 22 is provided on the sleeve core 20 side, and the deepest portion of the groove 22 is in contact with the cylinder 39. However, by providing the groove 22 on the sleeve core 20 side, a small inductor can be provided. Also in manufacturing, the radius of the cylinder 39 can be increased. Therefore, the strength of the column 39 included in the jig is improved.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the above-mentioned form, It can implement in the form variously deformed.

  For example, in the above-described embodiment, the dimensions related to the respective parts are illustrated, but are not limited to the illustrated dimensions or angles.

  Further, in the above-described embodiment, the sleeve core 20 having the lower surface side recess 24b is configured so that the distance in the vertical direction of the inductor 1 according to the present invention does not increase. However, the connection terminal 5 can be attached without the lower surface side recess 24b.

  Further, in the present embodiment, the groove 22 having a semicircular cross section that penetrates the upper surface and the lower surface of the sleeve core 20 is provided, but the present invention is not limited to such a form. For example, even if it is not a semicircle, the cross section may be a rectangle, a semi-ellipse, a 2/3 circle, or a 1/3 circle. Moreover, the thing which does not penetrate the upper surface of the sleeve core 20 may be sufficient. For example, the groove 22 may pass through at least the lower surface of the sleeve core 20. The groove 22 including the lower surface and not including the upper surface is provided, and the height in the Z direction of the column 39 arranged in the jig is set to a height sufficient to contact the lower flange 3. Thus, the distance between the outer peripheral surface of the lower flange 3 and the inner wall surface of the sleeve core 20 is constant. That is, the length of the cylinder in the Z-axis direction is not limited to the same or longer than the distance in the thickness direction of the sleeve core 20. The lengths of the two or more cylinders 39 in the Z-axis direction may be different from each other.

  Further, in the above-described embodiment, the annular sleeve core 20 having an octagonal outer periphery is used. However, the shape is not limited to this, and the annular sleeve core having a polygonal shape other than the octagonal outer periphery is curved. An annular sleeve core or a sleeve core other than an annular shape may be used. For example, any L-shape as shown in FIG. 12 or I-shape as shown in FIG.

  Moreover, in this Embodiment, although the four cylinders 39 are arrange | positioned as a convex part, it is not restricted to such a form. For example, if there are two or more as shown in FIGS. 12 and 13, the gap between the drum core 10 and the sleeve core 20 can be made constant. In this embodiment, the column 39 is adopted as the convex portion, but the convex portion is not limited to the column 39. For example, a quadrangular prism may be used, or a cone having a radius larger toward the bottom surface may be used.

  In this embodiment, the column 39 is fixed to the pedestal 31 by welding. However, the column 39 may be fixed by any method as long as the column 39 can be erected on the pedestal 31. When the cylinder 39 is brought into contact with the sleeve core 20 or the drum core 10, the cylinder 39 may be fixed so as not to move. For example, the cylinder 39 may be screwed onto the pedestal. Further, it may be bonded with an adhesive interposed.

  In the above-described embodiment, the material of the winding 4 is enameled wire using copper. However, the material of the winding 4 is not limited to copper, and may be another metal having good conductivity. . Although the nickel-based ferrite core is used as the material of the drum core 10, the material of the drum core 10 may be a silicon steel plate, permalloy, dust material, or other magnetic material such as manganese-based ferrite.

  Moreover, in the above-mentioned embodiment, although the metal is employ | adopted as a material of the terminal 5 for a connection, it is not limited to this, A conductive film is provided on the outer side of a nonelectroconductive member as the terminal 5 for a connection. The formed member may be adopted, and the side surface portion 52, the upper surface portion 51, and the lower surface portion 53 of the connection terminal 5 may be manufactured by plating or sputtering.

  Moreover, step S103 and step S104 may be reversed or may be performed simultaneously. However, by arranging the drum core 10 after arranging the sleeve core 20 to which the connection terminal 5 is connected, the end of the winding 4 wound around the winding part 2 of the drum core 10 is connected to the sleeve core 20. It can arrange | position to an upper surface side. Therefore, the operation | work which connects the terminal of the coil | winding 4 by soldering etc. becomes easy. Further, step S101 and step S102 may be reversed. Furthermore, step S105 and step S106 may be reversed.

  Moreover, in this Embodiment, although the terminal of the coil | winding 4 is supposed to be connected to the upper surface part 51 with a solder, it is not restricted to such a form. For example, the end of the winding 4 may be connected to the connection terminal 5 by welding. Or it is good also as the terminal 5 for a connection which has a binding part for hooking the terminal of the coil | winding 4 and winding.

  Moreover, in this Embodiment, although the groove | channel 22 for the cylinder 39 being inserted is formed only in the sleeve core 20 side, it is not restricted to such a form. As illustrated in FIG. 14, a groove 22 b for inserting the column 39 as a convex portion may be formed on the drum core 10 side so as to face the groove 22 on the sleeve core 20 side. When the groove 22b is also formed on the drum core 10 side, a cylinder 39 having a larger diameter can be used. Therefore, the strength of the column 39 can be improved. Moreover, you may make it the form that the groove | channel 22b for the cylinder 39 as a convex part being inserted only in the drum core 10 side is provided. However, if the groove 22 is provided only in the sleeve core 20, it is possible to prevent the mechanical strength of the flange portion 3 from being lowered, so that the inductor 1 that is not easily broken even when used at a site where vibration or impact is applied is particularly preferable. .

  Next, the DC superposition characteristics of the inductor 1 of the present invention were measured. In contrast to the embodiment according to the present invention (hereinafter referred to as the product of the present invention), the drum core 10 is provided by providing a protrusion on either the outer surface of the flange 3 of the drum core 10 or the inner surface of the sleeve core 20. An inductor according to the prior art (hereinafter referred to as a prior art product) in which the gap between the sleeve core 20 and the sleeve core 20 is constant was used as a comparative example. FIG. 15 shows the result of measuring the inductance value when a direct current is superimposed on each inductor.

  In FIG. 15, the measured value when the direct current is superimposed on the product of the present invention is indicated by a solid line, and the measured value when the direct current is superimposed on the conventional technology product is indicated by a broken line. In the product of the present invention, there was no significant difference in the inductance value in any region of 0 to 0.7A. On the other hand, the inductance value when a DC current of 0 to 0.3 A was passed through the prior art product was higher than the inductance value when a DC current of 0.3 to 0.7 A was passed through the prior art product. That is, it can be said that the product of the present invention has a more constant inductance value when the current value is changed, and improves the DC superimposition characteristics, as compared with the prior art product.

The present invention is particularly suitable for a minute surface-mount inductor incorporated in a portable terminal such as a cellular phone or a PDA.

It is a perspective view showing an example of an inductor concerning an embodiment of the invention. It is a top view of the inductor shown in FIG. FIG. 2 is a side view of the inductor shown in FIG. 1. FIG. 3 is a cross-sectional view of the inductor shown in FIG. 1 taken along a plane extending along the line AA in FIG. 2 and extending in the vertical direction of the paper surface. FIG. 3 is a cross-sectional view when the inductor shown in FIG. 1 is cut along a plane extending along the line BB in FIG. 2 and extending in the vertical direction of the drawing. It is a top view of the jig | tool used in order to manufacture the inductor shown in FIG. 2 is a flowchart for explaining a method of manufacturing the inductor shown in FIG. It is a perspective view for demonstrating a drum core arrangement | positioning step. It is a perspective view for demonstrating a ring core arrangement | positioning step. It is a perspective view for demonstrating the connection terminal adhesion process. It is a perspective view which shows the state by which the inductor of this invention has been arrange | positioned at the jig | tool. FIG. 6 is a perspective view showing a state in which an inductor having an L-shaped ring core is installed in a jig as a modification of the present invention. FIG. 7 is a perspective view showing a state where an inductor having an I-shaped ring core is installed in a jig as a modification of the present invention. FIG. 7 is a perspective view showing an inductor having grooves in both a sleeve core and a drum core as a modification of the present invention. It is a graph which compares the direct current | flow superimposition characteristic of the inductor of this invention, and the inductor which concerns on a prior art.

Explanation of symbols

1. Inductor (magnetic element)
2 ... Winding part 3 ... Eaves part 4 ... Winding 5 ... Connection terminal 10 ... Drum core 20 ... Ring core 22 ... Groove 30 ... Jig 39 ... Cylinder (convex part)

Claims (3)

A magnetic element mounted on a substrate,
A drum core having two flanges, surrounded by the two flanges and having a winding portion around which a winding is wound;
A sleeve core having an inner wall facing at least a part of the collar,
A magnetic element, wherein at least one of the flange portion and the inner wall is formed with two or more grooves into which the convex portion of the jig can be inserted in the standing direction of the winding portion. . A connection terminal for connecting the terminal end of the winding and the conductive portion of the substrate is disposed at a position different from the groove of the sleeve core,
2. The magnetic element according to claim 1, wherein an adhesive is interposed in a portion other than the connection terminal and the groove, and in a gap between the drum core and the sleeve core. A drum core having two flanges, surrounded by the two flanges and having a winding portion around which a winding is wound;
A sleeve core having an inner wall facing at least a part of the flange,
A method of manufacturing a magnetic element having two or more grooves formed in the standing direction of the winding portion on at least one of the flange portion or the inner wall,
A winding step of winding the winding around the winding portion;
A sleeve core disposing step of disposing the sleeve core in a jig having two or more protrusions inserted into the groove, with the protrusions aligned with the grooves;
A drum core placement step for placing the drum core so as to abut against the convex portion, performed before and after the sleeve core placement step;
An adhesion step of interposing an adhesive in the gap between the drum core and the sleeve core;
A step of removing the drum core and the sleeve core as one body in the protruding direction of the convex portion; and
A method for manufacturing a magnetic element, comprising: