JP4799601B2 - Magnetic element - Google Patents

Description

  The present invention relates to a magnetic element, and more particularly to an inductance element used for a power supply.

  In recent years, there has been a strong demand for miniaturization of magnetic elements by high-density mounting, a multilayer array substrate configuration, and the like, and there has been a strong demand for cost reduction of products. As a form of a conventional magnetic element, a structure in which a structure in which a brazed core made of a ferrite magnetic core and a ring core are combined is known (see, for example, Patent Document 1).

Furthermore, as shown in FIG. 16, a circuit configuration is known in which a plurality of magnetic elements (for example, inductance elements) having the same or similar electrical characteristics or shape are arranged on a mounting substrate.
JP 2002-313635 A

  However, as shown in FIG. 16, when a plurality of inductance elements having the same or similar electrical characteristics or shape are arranged on the mounting board, the mounting is proportional to the arrangement area of the inductance elements on the mounting board. It is necessary to secure a space, which causes a problem that the mounting substrate becomes large.

  Furthermore, not only an inductance element but also a mounting element mounted on a mounting board needs to be appropriately spaced from an adjacent mounting element in order to prevent damage to the element during mounting work. In order to satisfy the requirement at a high level, there arises a problem that the layout area of the mounted inductance element must be further reduced.

  The present invention provides a magnetic element having a small arrangement area with respect to a mounting substrate in consideration of the above-described points.

The magnetic element according to the present invention includes a first core and a second core made of a magnetic material having a flange portion having a flange surface on at least one end of the core, and the first core and the second core. In the magnetic element comprising: a coil wound around each of the winding cores; and an intermediate core made of a magnetic material disposed between the first core and the second core. When the cross-sectional area S1 of the core portion of the first core, the cross-sectional area S3 of the core portion of the second core, and the cross-sectional area of the intermediate core are S2, the permeability of the magnetic material constituting the intermediate core is determined. The magnetic permeability is set to be lower than the magnetic permeability of the magnetic material constituting the first core and the second core.

Preferably, a gap is formed between at least one of the flanges of the first core and the second core and the intermediate core.
Preferably, it is appropriate that the first core, the second core, and the intermediate core are fixed by an adhesive.
Preferably, a magnetic shield member is provided.
Furthermore, it is preferable that the magnetic shield member is made of a mixture of resin and magnetic powder.

  In the magnetic element of the present invention, the magnetic permeability of the intermediate core is set lower than the magnetic permeability of the first core and the second core.

  According to the magnetic element of the present invention, it is possible to obtain substantially the same operation as when a magnetic gap is provided between the first core, the second core, and the intermediate core.

  Hereinafter, examples of the best mode for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the following examples.

FIG. 1 is an exploded perspective view of a magnetic element according to the present invention.
As shown in FIG. 1, the inductance element 1 as a magnetic element includes a first flanged core 2, a second flanged core 3, and an intermediate core 4. Further, the first flanged core 2 and the second flanged core 3 in this example have the same shape. In addition, the 1st and 2nd cores 2 and 3 with a hook may differ in the diameter of a mutual core, and the shape of a collar.

  The first flanged core 2 includes a flange portion 2b having a flat flange surface 2d and a first coil 2a wound around a winding core (not shown) connected to the flange portion 2b. Similarly, the second flanged core 3 includes a flange portion 3b having a flat flange surface 3d and a second coil 3a wound around a core (not shown) connected to the flange portion 3b. . The first brazed core 2 and the second brazed core 3 are made of a magnetic material using Ni-Zn ferrite.

  The intermediate core 4 is formed so that the height thereof coincides with the first flanged core 2 and the second flanged core 3 and faces the first flanged core 2 and the second flanged core 3. Is formed with a fitting portion 4a having a shape matching the outer peripheral shape of the flange portion 2b and the flange portion 3b. The intermediate core 4 is formed of a material using Ni—Zn ferrite, and is formed by grinding, for example, a rectangular shape pressed by a die press.

FIG. 2 is a perspective view of a magnetic element according to the present invention.
The inductance element 1 is assembled so that a part of the outer peripheral shape of the flange portion 2b of the first flange core 2 and the flange portion 3b of the second flange core 3 and the fitting portion 4a of the intermediate core 4 are matched. It has been. That is, a closed magnetic circuit is formed in the inductance element 1 by the first flanged core 2, the second flanged core 3, and the intermediate core 4. Further, the flange surface 2d and the flange surface 3d and the vertical surface of the intermediate core 4 are assembled so as to form one plane. When the brazed cores 2 and 3 and the intermediate core 4 are assembled, an adhesive is applied and fixed to the side surfaces of the flange portions 2b and 3b and desired portions of the intermediate core 4 corresponding to the side surfaces.

  In order to use the inductance element 1 as a power source, that is, to handle a large current, it is necessary to provide a gap in the magnetic path. As a method of providing a gap, an air gap is formed between the flanged core and the intermediate core 4 by making the outer peripheral diameter of at least one collar part smaller than the outer diameter of the other collar part by a specific dimension. It is possible. As another method, by setting the effective permeability of the intermediate core 4 to be lower than the effective permeability of the brazed cores 2 and 3, the effect as a gap can be substantially achieved. In addition, when using the method, various changes are possible, such as using a magnetic material with low magnetic permeability, or using a mixture of resin and magnetic powder as a core material.

FIG. 3 is a cross-sectional view of the magnetic element according to the present invention taken along line AA shown in FIG.
A coil 2 a is wound around the core 2 c of the first flanged core 2, and a coil 3 a is wound around the core 3 c of the second flanged core 3. The coils 2a and 3a generate magnetic fluxes Φ1 and Φ2 that pass through the winding cores 2c and 3c, the flanges 2b and 3b, and the intermediate core 4 in the direction of the arrows shown in the drawing.
Here, the cross-sectional area of the core 2c parallel to the flange surfaces 2d and 3d is S1, the cross-sectional area of the core 3c is S3, parallel to the flange surfaces 2d and 3d, and the intermediate core 4 as shown in FIG. The cross-sectional area of the narrow portion (specifically, the cross-sectional area at a half height of the intermediate core) is defined as S2 ′.

FIG. 4 is a cross-sectional view of the magnetic element according to the present invention taken along line BB shown in FIG.
A coil 2a is wound around the core 2c having a cross-sectional area S1, and the flange portion 2b has an outer peripheral diameter larger than the outer peripheral diameter of the coil 2a. Similarly, the coil 3a is wound around the core 3c having the cross-sectional area S3, and the flange portion 3b has an outer diameter larger than the outer diameter of the coil 3a.
Moreover, the fitting part 4a provided in the intermediate | middle core 4 is fitting with a part of outer periphery of the collar part 2b and the collar part 3b. Here, the cross-sectional area of the widest portion of the intermediate core 4 (specifically, the cross-sectional area at the upper and lower end portions of the intermediate core 4) parallel to the flange surfaces 2d and 3d is defined as S2.

  According to the inductance element 1 of the present example, the intermediate core 4 has the fitting portion 4a that matches the shape of the flange portions 2b and 3b. The cores 2 and 3 and the intermediate core 4 can be combined. When the contact area between the flanges 2b and 3b and the intermediate core 4 is small, for example, in the case of a point contact, the magnetic saturation state occurs immediately, but like the inductance element 1 of this example By forming the shape of the fitting portion 4a of the intermediate core 4 so as to match the shape of the flange portions 2b and 3b, the magnetic saturation occurring in the intermediate core 4 and the magnetic saturation occurring in the flanged cores 2 and 3 Can be made uniform, and the occurrence of a local magnetic saturation state in the inductance element 1 can be delayed.

  According to the inductance element 1 of the present example, since the brazed cores 2 and 3 and the intermediate core 4 have simple configurations, there is an advantage that the manufacture of the element becomes very easy. That is, the cores for winding the coils 2a and 3a are commonly used cores 2 and 3, and the productivity and manufacturing technology related to the coil winding process from the manufacture of the core are very stable. Will be. Moreover, since the shape of the intermediate core 4 is simple and easy to manufacture, the manufacturing cost of the magnetic element can be reduced overall.

  Further, according to the inductance element 1 of this example, the cross-sectional area of the core 2c of the brazed core 2 is S1, the cross-sectional area of the core 3c of the brazed core 3 is S3, and the cross-sectional area of the intermediate core 4 is S2. Since S1 ≦ S3 and S1 ≦ S2, the overall balance of the magnetic saturation of the brazed cores 2 and 3 and the intermediate core 4 is excellent for various applications. It has the following advantages.

  That is, when S1 ≦ S3 and S1 = S2, a current is applied to one of the coil 2a of the first flanged core 2 or the coil 3a of the second flanged core 3. In addition, magnetic saturation does not occur, and the arrangement area of the inductance element 1 can be reduced.

  Further, when S1 ≦ S3 and 5 × S1 = S2, a current is applied to both the coil 2a of the first flanged core 2 and the coil 3a of the second flanged core 3. In addition, since the magnetic saturation of the intermediate core 4 does not occur and the cross-sectional area S2 of the intermediate core 4 becomes large, the rigidity of the inductance element 1 can be increased.

  When S1 ≦ S3 and S1> S2, the cross-sectional area S2 of the intermediate core 4 is substantially smaller than the cross-sectional area S1 of the core 2c of the brazed core 2, so that at least the coil 2a has an overcurrent. When is applied, first, magnetic saturation occurs in the intermediate core 4, and there is a possibility that the electrical characteristics (typically, inductance value) of the inductance element 1 may be rapidly reduced. Furthermore, since the cross-sectional area S2 of the intermediate core 4 is reduced, the mechanical strength and rigidity of the inductance element 1 are significantly reduced.

  In addition, when S1 ≦ S3 and 5 × S1 <S2, the reliability of the inductance element against magnetic saturation that occurs when current is applied can be obtained, but the cross-sectional area S2 of the intermediate core 4 becomes large. Element 1 becomes large. Further, in order to maintain sufficient strength of the inductance element 1, the cross-sectional area S2 ′ at the narrowest dimension portion of the intermediate core 4 needs to be equal to or larger than the cross-sectional area S1 of the cores 2c and 3c of the brazed core. As a result, the inductance element also becomes large. Further, in order to design the intermediate core 4 having an outer shape along the shape of the flange portions 2b and 3b of the flanged core, the value of the cross-sectional area S2 of the intermediate core is substantially the same as the cross-sectional area S1 of the core. It was found to be 5 × S1.

  From the above consideration, in the inductance element 1 of the present example, the cross-sectional area of the core 2c of the first brazed core 2 is S1, the cross-sectional area of the intermediate core is S2, and the core 3c of the second brazed core is When the cross-sectional area is S3, S1 ≦ S3 and S1 ≦ S2 are satisfied. Preferably, S1 ≦ S3 and S1 ≦ S2 ≦ 5 × S1. It is comprised as follows.

  Further, according to the inductance element 1 of the present example, as shown in FIG. 6, the inductance element 1 of the present example and the two inductance elements 101 including the conventional brazed core 102 and the ring core 103 are in close contact with each other. As compared with, the arrangement area of the inductance element 1 can be reduced by the length d. Furthermore, since the two ring cores 103 can be replaced with one intermediate core 4, it is possible to obtain the inductance element 1 having the same or better electrical characteristics at a low cost. That is, according to the inductance element 1 of the present example, it is possible to reduce the mounting space of the inductance element itself by combining the two inductance elements 101 conventionally used, and the inductance element of the present example. 1 has two coils 2a and 3a in one solid without giving magnetic coupling.

  Furthermore, according to the inductance element 1 of the present example, the two intermediate cores 2 and 3 that have been generally used conventionally are used, and the intermediate core 4 having a simple shape is placed between the intermediate cores 2 and 3. By arranging, it becomes possible to make the two magnetic elements originally used on the circuit board one, and in this case, the size of the inductance element 1 of this example is smaller than that of the conventional one. It is not doubled, and it is possible to obtain the effect of substantially reducing the arrangement area of the inductance element 1 and reducing the cost.

FIG. 5 is a perspective view when the magnetic element according to the present invention is mounted on a mounting board.
In FIG. 5, parts corresponding to those in FIG.
A terminal electrode 5 is provided on the mounting surface 2 e provided on the flange surface 2 d of the first flanged core 2. Similarly, a terminal electrode 5 is provided on the mounting surface 3e provided on the flange surface 3d of the second flanged core 3. The inductance element 1 is mounted on the mounting substrate 6 in a state in which contact between the terminal electrode 5 and the mounting substrate 6 is maintained by soldering. As a result, the current supplied from the mounting substrate 6 is supplied to the inductance element 1 through the terminal electrode 5.

  The XX line shown with the dashed-dotted line in the figure shows the major axis direction of the cores 2c and 3c (not shown) of the brazed cores 2 and 3. Moreover, the YY line shown with the dashed-dotted line in the figure shows the direction parallel to the mounting surfaces 2e and 3e. That is, in this example, the major axes of the cores 2c and 3c of the flanged cores 2 and 3 are set to be perpendicular to the mounting surfaces 2e and 3e.

  By doing so, according to the inductance element 1 of this example, the major axis direction of the winding cores 2c and 3c of the flanged cores 2 and 3 is perpendicular to the mounting surfaces 2e and 3e, and the flange surface 2d, Since 3d is parallel to the mounting surfaces 2e and 3e, magnetic flux leakage in the vertical direction of the inductance element 1 can be suppressed mainly by the flange surfaces 2d and 3d. For this reason, for example, in the case of a multilayer circuit configuration in which signal boards are arranged in the vertical direction of the power supply board, it is possible to suppress malfunction of electronic components for signal processing that may be caused by magnetic flux leaking in the vertical direction It becomes.

FIG. 7 is an exploded perspective view of another embodiment of a magnetic element according to the present invention.
As shown in FIG. 7, the inductance element 11 as a magnetic element includes a first flanged core 12, a second flanged core 13, and an intermediate core 14. Further, the first flanged core 12 and the second flanged core 13 in this example have the same shape. In addition, the 1st and 2nd cores 12 and 13 with a hook may differ in the diameter of a mutual winding core, and the shape of a collar.

  The first flanged core 12 includes a flange portion 12b having a substantially square flange surface 12d, and a first coil 12a wound around a core (not shown) connected to the flange portion 12b. Similarly, the second flanged core 13 includes a flange portion 13b having a substantially square flange surface 13d and a second coil 13a wound around a core (not shown) connected to the flange portion 13b. Yes. The first brazed core 12 and the second brazed core 13 are formed of a magnetic powder material using Ni-Zn ferrite.

  The intermediate core 14 is formed in a rectangular parallelepiped shape, and is formed so as to have the same height as the first flanged core 12 and the second flanged core 13. The intermediate core 14 is made of a magnetic material using Ni—Zn ferrite and is formed into a rectangular shape by a die press, for example.

FIG. 8 is a perspective view of another embodiment of a magnetic element according to the present invention.
The inductance element 1 is assembled so that one side of the outer peripheral shape of the flange 12d of the first flanged core 12 and the flange 13d of the second flanged core 13 and the plane portion of the intermediate core 14 coincide. Further, the flange surface 12d and the flange surface 13d and one surface of the rectangular parallelepiped of the intermediate core 14 are assembled so as to form one plane.

FIG. 9 is a perspective view when a magnetic element according to another embodiment of the present invention is mounted on a mounting board.
A terminal electrode 15 is provided on the mounting surface 12 e provided on the flange surface 12 d of the first flanged core 12. Similarly, a terminal electrode 15 is provided on the mounting surface 13 e provided on the flange surface 13 d of the second flanged core 13. The terminal electrode 15 is formed by applying and baking Ag paste on the mounting surfaces 12e and 13e. Thus, a magnetic element excellent in productivity, cost, and mountability can be provided by using an electrode-type core obtained by applying and baking Ag paste to a portion to be a terminal. The inductance element 11 is mounted on the mounting substrate 6 in a state where the contact between the terminal electrode 15 and the mounting substrate 6 is maintained by soldering. As a result, the current supplied from the mounting substrate 6 is supplied to the inductance element 11 via the terminal electrode 15.

  The XX line shown with the dashed-dotted line in the figure shows the major axis direction of the winding cores 12c, 13c (not shown) of the flanged cores 12, 13. Moreover, the YY line shown with the dashed-dotted line in the figure shows the direction parallel to the mounting surfaces 12e and 13e. That is, in this example, the major axes of the cores 12c and 13c of the flanged core are set to be horizontal with respect to the mounting surfaces 12e and 13e.

  By doing in this way, according to the inductance element 11 of this example, the major axis direction of the cores 12c and 13c of the flanged cores 12 and 13 is parallel to the mounting surfaces 12e and 13e, and the flange portion 12b, Since 13b has a substantially square shape, the mountability and stability with respect to the mounting substrate 6 are excellent.

FIG. 10 is an exploded perspective view of a magnetic element according to still another embodiment of the present invention.
10, parts corresponding to those in FIG. 7 are denoted by the same reference numerals, and redundant description is omitted.
In the inductance element 11 of this example, a magnetic shield plate 17 is provided above the first flanged core 12, the second flanged core 13, and the intermediate core 14. The magnetic shield plate 17 is formed of, for example, a high permeability magnetic plate or a plate-like member in which resin and magnetic powder are mixed.

FIG. 11 is a perspective view of another embodiment of a magnetic element according to the present invention.
In FIG. 11, parts corresponding to those in FIG.
In the inductance element 11 of this example, the flange surface 12d and the flange surface 13d and one surface of the rectangular parallelepiped intermediate core 14 are assembled so as to form one plane, and the coil 12a is formed on the upper end side of this plane. , 13a is attached with a magnetic shield plate 17 so as to cover it.

FIG. 12 is a perspective view when a magnetic element according to still another embodiment of the present invention is mounted on a mounting board.
In FIG. 12, parts corresponding to those in FIG.
In the inductance element 11 of this example, the magnetic shield substrate 17 is mounted on the mounting substrate 6 in a state where the magnetic shield substrate 17 is mounted on the opposite side of the mounting surfaces 12e and 13e mounted on the mounting substrate 6 of the flanged cores 12 and 13. The

  According to the inductance element 11 of this example, since the configuration including the magnetic shield plate 17 on the upper part of the element is employed, it is possible to suppress a problem such as leakage of magnetic flux from the upper part of the inductance element 11. It is possible to provide a highly efficient inductance element 11. If the element size is not limited, it is possible to further reduce the leakage magnetic flux by attaching the magnetic shield plate 17 to the side portions of the flanged cores 12 and 13.

FIG. 13 is a perspective exploded view of a magnetic element of still another embodiment according to the present invention.
As shown in FIG. 13, the inductance element 21 as a magnetic element includes a first flanged core 22, a second flanged core 23, and an intermediate core 24. Further, the first flanged core 22 and the second flanged core 23 in this example have the same shape. The first and second flanged cores 22 and 23 may have different diameters of the winding cores and the shape of the flanges.

  The first flanged core 22 is a so-called single flanged core, and is a first coil wound around a flange 22b having a flat flange surface (not shown) and a core 22c connected to the flange 22b. 22a. Moreover, the front-end | tip part on the opposite side to the collar part 22b of the core 22c is formed so that it may protrude from the 1st coil 22a. Similarly, the second flanged core 23 is a single flanged core, and is wound around a flange portion 23b having a flat flange surface (not shown) and a core 23c connected to the flange portion 23b. It consists of a coil 23a. The end of the core 23c opposite to the flange 23b is formed so as to protrude from the second coil 23a. The first brazed core 22 and the second brazed core 23 are formed of a magnetic material using Ni-Zn ferrite.

  The intermediate core 24 includes a lower structure portion 24 a disposed between the first flanged core 22 and the second flanged core 23, and the upper portion of the first flanged core 22 and the second flanged core 23. The upper structure portion 24b is disposed so as to straddle and has a substantially T-shaped cross section. On the surface of the lower structure portion 24a facing the first flanged core 2 and the second flanged core 3, a fitting portion 24d having a shape matching the outer peripheral shape of the flange 22b and the flange 23b is formed. Has been. Further, the upper structure portion 24b is formed with a core fitting hole 24c for fitting with the cores 22c and 23c protruding from the coil. The intermediate core 24 is formed of a material using Ni—Zn ferrite and is formed by, for example, a die press.

FIG. 14 is a perspective view of a magnetic element of still another embodiment according to the present invention.
In the inductance element 21 of the present example, a part of the outer periphery of the flange portions 22b and 23b of the flanged cores 22 and 23 is fitted into a fitting portion 24d provided in the lower structure 24a, 23 is inserted into a core fitting hole 24c provided in the upper structure 24b, and the end surfaces of the tips of the cores 22c and 23c and the upper surface of the upper structure are one. The inductance element 21 is assembled so as to form a plane.

FIG. 15 is a perspective view when a magnetic element of still another embodiment according to the present invention is mounted on a mounting board.
In FIG. 15, parts corresponding to those in FIG.
A terminal electrode 25 is provided on the mounting surface 22 e provided on the flange surface 22 d of the first flanged core 22. Similarly, a terminal electrode 25 is provided on the mounting surface 23 e provided on the flange surface 23 d of the second flanged core 23. The inductance element 21 is mounted on the mounting substrate 6 in a state where the contact between the terminal electrode 25 and the mounting substrate 6 is maintained by soldering. As a result, the current supplied from the mounting substrate 6 is supplied to the inductance element 21 via the terminal electrode 25.

  The XX line shown with the dashed-dotted line in the figure shows the major axis direction of the winding cores 22c, 23c (not shown) of the flanged cores 22, 23. Moreover, the YY line shown with the dashed-dotted line in the figure shows the direction parallel to the mounting surfaces 22e and 23e. That is, in this example, the major axes of the winding cores 22c and 23c of the flanged cores 22 and 23 are set to be perpendicular to the mounting surfaces 22e and 23e.

  According to the inductance element 21 of this example, by inserting the tips of the cores 22c and 23c of the flanged core into the core fitting holes 24c, positioning and fixing at the time of assembling the components can be performed easily and reliably. Since the upper surface portions of 22a and 23a are covered with the upper structure 24b of the intermediate core 24, the leakage magnetic flux from the coil can be suppressed.

  The magnetic material used to form the first brazed core, the second brazed core, and the intermediate core is not limited to Ni—Zn ferrite, but Mn—Zn ferrite, metal magnetic material, An amorphous magnetic material or the like can be used.

FIG. 1 is an exploded perspective view of a magnetic element according to the present invention. FIG. 2 is a perspective view of a magnetic element according to the present invention. FIG. 3 is a cross-sectional view of a magnetic element according to the present invention. FIG. 4 is a plan sectional view of a magnetic element according to the present invention. FIG. 5 is a perspective view when the magnetic element according to the present invention is mounted on a mounting board. FIG. 6 is a cross-sectional view of a conventional magnetic element compared with a magnetic element according to the present invention. FIG. 7 is an exploded perspective view of another embodiment of a magnetic element according to the present invention. FIG. 8 is a perspective view of another embodiment of a magnetic element according to the present invention. FIG. 9 is a perspective view when a magnetic element according to another embodiment of the present invention is mounted on a mounting board. FIG. 10 is an exploded perspective view of a magnetic element according to still another embodiment of the present invention. FIG. 11 is a perspective view of another embodiment of a magnetic element according to the present invention. FIG. 12 is a perspective view when a magnetic element according to still another embodiment of the present invention is mounted on a mounting board. FIG. 13 is a perspective exploded view of a magnetic element of still another embodiment according to the present invention. FIG. 14 is a perspective view of a magnetic element of still another embodiment according to the present invention. FIG. 15 is a perspective view when a magnetic element of still another embodiment according to the present invention is mounted on a mounting board. FIG. 16 is a diagram showing a conventional circuit configuration in which a plurality of conventional magnetic elements are arranged.

Explanation of symbols

  1, 11, 21.. Inductance element, 2, 12, 22, first core with flange, 2 a, 12 a, 22 a, coil, 2 b, 12 b, 22 b,. Winding core, 2d, 12d, 22d ··· Surface, 2e, 12e, 22e ·· Mounting surface, 3, 13, 23 ··· Second core with flange, 3a, 13a, 23a · · coil, 3b, 13b, 23b .. collar part, 3c, 13c, 23c .. winding core, 3d, 13d, 23d .. collar surface, 3e, 13e, 23e .. mounting surface, 4, 14, 24 .. intermediate core, 4a. ···, terminal electrode, 6 ·· mounting substrate, 17 ·· magnetic shield, 24a ·· lower structure portion, 24b ·· upper structure portion, 24c ·· core fitting hole, S1 ·・ Cross-sectional area of core of flanged core, S2 ・ ・ Cross-sectional area of intermediate core, Φ1, Φ2 ・ ・Magnetic flux line, X ... Long axis of core, Y ... Mounting surface axis

Claims (4)

A first core and a second core made of a magnetic material having a flange portion having a flange surface on at least one end of the winding core;
A coil wound around each core of the first core and the second core;
An intermediate core made of a magnetic material disposed between the first core and the second core;
In a magnetic element composed of
When the cross-sectional area S1 of the core portion of the first core, the cross-sectional area S3 of the core portion of the second core, and the cross-sectional area of the intermediate core are S2, the relationship of S1 = S3 ≦ S2 is established. With
A magnetic element , wherein the magnetic material constituting the intermediate core has a magnetic permeability set lower than the magnetic permeability of the magnetic material constituting the first core and the second core. The magnetic element according to claim 1,
The magnetic element, wherein the first core, the second core, and the intermediate core are fixed by an adhesive. The magnetic element according to any one of claims 1 and 2 ,
A magnetic element comprising a magnetic shield member. The magnetic element according to claim 3 ,
The magnetic element according to claim 1, wherein the magnetic shield member is made of a mixture of resin and magnetic powder.

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