JP2019192840A

JP2019192840A - Inductor

Info

Publication number: JP2019192840A
Application number: JP2018085904A
Authority: JP
Inventors: 高田　義則; Yoshinori Takada; 義則高田; 常川　昭雄; Akio Tsunekawa; 昭雄常川; 下村　理; Osamu Shimomura; 理下村
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2019-10-31

Abstract

To provide an inductor increased in dielectric withstand voltage between a pair of terminals.SOLUTION: An inductor includes: a magnetic body 20 having a pair of opposing surfaces 23 and 24 facing each other; a coil 10 embedded in the magnetic body 20; and a pair of terminals 30 made of a metal plate, connected to both ends of the coil 10, respectively, and arranged on the pair of opposing surfaces 23 and 24 of the magnetic body 20, respectively. Each of the terminals 30 has an embedded portion 32 embedded in the magnetic body 20 and an exposed portion 33 exposed to the outside of the magnetic body 20. The embedded portion 32 includes: a first piece 34 connected to the exposed portion 33 and extending in a direction from the opposing surfaces 23 and 24 of the magnetic body 20 toward the inside of the magnetic body 20; and a second piece 35 connected to the first piece 34, and bent in a direction toward the outside of the magnetic body 20 while being superimposed on the first piece 34.SELECTED DRAWING: Figure 4

Description

本発明は、各種電子機器に用いられるインダクタに関するものである。 The present invention relates to an inductor used in various electronic devices.

従来から、ＤＣ−ＤＣコンバータ装置等の電子装置に、電源電圧の昇降圧、直流電流の平滑化等を目的にインダクタが広く用いられている。 Conventionally, inductors have been widely used in electronic devices such as DC-DC converter devices for the purpose of stepping up and down power supply voltage, smoothing direct current, and the like.

このような従来のインダクタとしては、磁性粉末と結合剤を混合して加圧成形された直方体形状の磁心と、この磁心に埋設された円筒形状のコイルと、このコイルの両端部に接続されて磁心の相対向する２つの側面から個別に突出する一対の端子とを備えたインダクタが知られていた。 As such a conventional inductor, a rectangular parallelepiped magnetic core formed by pressure mixing a magnetic powder and a binder, a cylindrical coil embedded in the magnetic core, and both ends of the coil are connected. 2. Description of the Related Art An inductor having a pair of terminals that individually protrude from two opposite side surfaces of a magnetic core has been known.

そして、この一対の実装端子は、磁心の内部に埋設される埋設部と、磁心の外部に露出する露出部を有し、埋設部に貫通孔が形成され、この貫通孔に磁性粉末を充填させることで実装端子が磁心から抜け落ちることを防止させることが知られていた。 The pair of mounting terminals have an embedded portion embedded in the magnetic core and an exposed portion exposed to the outside of the magnetic core, a through hole is formed in the embedded portion, and the through hole is filled with magnetic powder. This has been known to prevent the mounting terminal from falling out of the magnetic core.

特開２０１７−５４９８７号公報JP 2017-54987 A

上記のような従来のインダクタの構成では、実装端子の埋設部に貫通孔を形成しているので、貫通孔を形成した分だけ埋設部の寸法が長くなって、一対の実装端子の埋設部間の間隔が短くなりやすいため、一対の端子間の絶縁耐電圧を高くすることが難しいという問題点を有していた。 In the configuration of the conventional inductor as described above, since the through hole is formed in the embedded portion of the mounting terminal, the size of the embedded portion is increased by the amount of the through hole formed, and the gap between the embedded portions of the pair of mounting terminals is increased. Since the distance between the two terminals tends to be short, it has been difficult to increase the dielectric strength voltage between the pair of terminals.

本発明は上記従来の課題を解決するものであり、一対の端子間の絶縁耐電圧を高くすることが可能なインダクタを提供することを目的とする。 The present invention solves the above-described conventional problems, and an object thereof is to provide an inductor capable of increasing the withstand voltage between a pair of terminals.

上記目的を達成するために、本開示の一態様に係るインダクタは、対向する一対の対向面を有する磁性体と、磁性体に埋設されるコイルと、金属板からなり、コイルの両端にそれぞれ繋がり磁性体の一対の対向面に配設される、一対の端子と、を有し、端子は、磁性体に埋設される、埋設部と、磁性体の外部に露出する、露出部と、を有し、埋設部は、露出部に繋がり、第一主面と当該第一主面の反対側の第一裏面を有し、磁性体の対向面から磁性体の内側に向かう方向に伸びる第一片と、当該第一片に繋がり、第一主面に繋がる第二主面と第一裏面に繋がり且つ第二主面の反対側の第二裏面を有し、第一片の第一裏面に第二裏面を重ね合せるようにした状態で磁性体の外側に向かう方向に折れ曲がる第二片と、を有するものである。 In order to achieve the above object, an inductor according to an aspect of the present disclosure includes a magnetic body having a pair of opposing surfaces, a coil embedded in the magnetic body, and a metal plate, and is connected to both ends of the coil. A pair of terminals disposed on a pair of opposing surfaces of the magnetic body, the terminals having an embedded portion embedded in the magnetic body and an exposed portion exposed to the outside of the magnetic body. The buried portion is connected to the exposed portion, has a first main surface and a first back surface opposite to the first main surface, and extends in a direction from the opposing surface of the magnetic material toward the inside of the magnetic material. And a second main surface connected to the first piece, a second main surface connected to the first main surface, and a second back surface on the opposite side of the second main surface. And a second piece that bends in a direction toward the outside of the magnetic body in a state in which the two back surfaces are overlapped.

本開示の一態様によれば、一対の端子間の絶縁耐電圧を高くすることを可能にすることができる。 According to one embodiment of the present disclosure, it is possible to increase the dielectric strength voltage between a pair of terminals.

本開示の一実施の形態におけるインダクタの斜視図The perspective view of the inductor in one embodiment of this indication 本開示の一実施の形態におけるインダクタの透過斜視図Transparent perspective view of an inductor according to an embodiment of the present disclosure 本開示の一実施の形態におけるインダクタの端子の斜視図The perspective view of the terminal of the inductor in one embodiment of this indication 図１におけるＡ−Ａ線の断面図Sectional view of the AA line in FIG. （ａ）埋設部の展開図（ｂ）埋設部の平面図（ｃ）埋設部の側面図(A) Development view of buried portion (b) Plan view of buried portion (c) Side view of buried portion （ａ）変形例１における埋設部の平面図（ｂ）変形例１における埋設部の側面図(A) The top view of the burying part in the modification 1 (b) The side view of the burying part in the modification 1 （ａ）変形例２における埋設部の展開図（ｂ）変形例２における埋設部の平面図（ｃ）変形例２における埋設部の側面図(A) Exploded view of buried part in modification 2 (b) Plan view of buried part in modification 2 (c) Side view of buried part in modification 2 （ａ）変形例３における埋設部の平面図（ｂ）変形例３における埋設部の側面図(A) The top view of the burying part in the modification 3 (b) The side view of the burying part in the modification 3 （ａ）変形例４における埋設部の展開図（ｂ）変形例４における埋設部の平面図（ｃ）変形例４における埋設部の側面図(A) Exploded view of buried portion in modified example (b) Plan view of buried portion in modified example (c) Side view of buried portion in modified example 4 （ａ）変形例５における埋設部の展開図（ｂ）変形例５における埋設部の平面図（ｃ）変形例５における埋設部の側面図(A) Exploded view of the buried portion in the modified example 5 (b) Plan view of the buried portion in the modified example 5 (c) Side view of the buried portion in the modified example 5 （ａ）変形例６における埋設部の展開図（ｂ）変形例６における埋設部の平面図（ｃ）変形例６における埋設部の側面図(A) Exploded view of buried part in modification 6 (b) Plan view of buried part in modification 6 (c) Side view of buried part in modification 6 （ａ）変形例７における埋設部の展開図（ｂ）変形例７における埋設部の平面図（ｃ）変形例７における埋設部の側面図(A) Exploded view of buried portion in modified example (b) Plan view of buried portion in modified example (c) Side view of buried portion in modified example 7

以下、本開示の一実施の形態におけるインダクタについて、図１〜図５を参照して説明する。 Hereinafter, an inductor according to an embodiment of the present disclosure will be described with reference to FIGS.

図１は本開示の一実施の形態におけるインダクタの斜視図であり、図２は同インダクタの透過斜視図であり、図３は本開示の一実施の形態におけるインダクタの端子の斜視図であり、図４は図１におけるＡ−Ａ線の断面図、図５（ａ）は埋設部の展開図であり、図５（ｂ）は埋設部の平面図、図５（ｃ）は埋設部の側面図である。 1 is a perspective view of an inductor according to an embodiment of the present disclosure, FIG. 2 is a transparent perspective view of the inductor, and FIG. 3 is a perspective view of a terminal of the inductor according to an embodiment of the present disclosure. 4 is a cross-sectional view taken along line AA in FIG. 1, FIG. 5A is a development view of the buried portion, FIG. 5B is a plan view of the buried portion, and FIG. 5C is a side view of the buried portion. FIG.

なお、図２は、後述する磁性体２０を透過した透過斜視図であり、磁性体２０の輪郭を破線で示している。 FIG. 2 is a transparent perspective view that passes through a magnetic body 20 to be described later, and the outline of the magnetic body 20 is indicated by a broken line.

図１〜図５に示すように、本実施の形態のインダクタ１００は、対向する一対の対向面を有する磁性体２０と、この磁性体２０に埋設されるコイル１０と、金属板からなり、コイル１０の両端にそれぞれ繋がり、磁性体２０の一対の対向面に配設される一対の端子３０とを有している。 As shown in FIGS. 1 to 5, the inductor 100 according to the present embodiment includes a magnetic body 20 having a pair of opposing surfaces, a coil 10 embedded in the magnetic body 20, and a metal plate. 10 and a pair of terminals 30 respectively connected to both ends of the magnetic body 20 and disposed on a pair of opposing surfaces of the magnetic body 20.

ここで、本明細書においては、図１、図２に示すように、端子３０の幅方向を第一方向２０１と規定し、矢印の先端方向を奥側、矢印の先端と反対側を手前側と称することがある。 In this specification, as shown in FIGS. 1 and 2, the width direction of the terminal 30 is defined as a first direction 201, the tip direction of the arrow is the back side, and the side opposite to the tip of the arrow is the front side. May be called.

また、第一方向２０１と直交し、一対の端子３０が対向する方向を第二方向２０２と規定し、矢印の先端方向を奥側、矢印の先端と反対側を手前側と称することがある。 Further, the direction orthogonal to the first direction 201 and facing the pair of terminals 30 is defined as a second direction 202, the tip direction of the arrow may be referred to as the back side, and the side opposite to the tip of the arrow may be referred to as the near side.

そして、第一方向２０１と第二方向２０２と直交する方向を第三方向２０３と規定し、矢印の先端方向を上側、矢印の先端と反対側を下側と称することがある。 A direction orthogonal to the first direction 201 and the second direction 202 is defined as a third direction 203, and the tip direction of the arrow may be referred to as the upper side, and the side opposite to the tip of the arrow may be referred to as the lower side.

なお、第一、第二、第三の方向については以降の図面においても同様である。 The same applies to the first, second, and third directions in the subsequent drawings.

本実施の形態のインダクタ１００の内、コイル１０は、ポリウレタン樹脂やポリアミドイミド樹脂等の絶縁性樹脂から成る絶縁皮膜を有した銅材などの導線１１を、空心の螺旋
状に巻回形成されたものであり、コイル１０の両端部の引き出し部１２は、互いに反対方向に引き出されて端子３０と接続されている。 Of the inductor 100 according to the present embodiment, the coil 10 is formed by winding a lead wire 11 such as a copper material having an insulating film made of an insulating resin such as polyurethane resin or polyamide-imide resin in a spiral shape. The lead portions 12 at both ends of the coil 10 are drawn in opposite directions and connected to the terminal 30.

また、磁性体２０は、磁性体粉末と結合材を混合した磁性材料からなり、この磁性材料を顆粒状の造粒粉にして、造粒粉にコイル１０を埋め込んで加圧成形されたものである。 The magnetic body 20 is made of a magnetic material in which a magnetic powder and a binder are mixed. The magnetic material is made into a granular granulated powder, and the coil 10 is embedded in the granulated powder and is pressure-molded. is there.

このように磁性体２０は、コイル１０を覆い、インダクタ１００の閉磁路の磁心と、インダクタ１００の本体部分となる外装体を兼ねている。 As described above, the magnetic body 20 covers the coil 10, and also serves as a magnetic core of the closed magnetic path of the inductor 100 and an exterior body serving as a main body portion of the inductor 100.

磁性体２０を構成する磁性体粉末と結合材の内、磁性体粉末は、軟磁性材料の中でも飽和磁束密度が高い鉄や鉄を主体とした金属磁性体、例えば鉄−ニッケル系合金、鉄−シリコン系合金、鉄−シリコン−アルミ系合金、鉄−シリコン−クロム系合金などの結晶質組成や、鉄−シリコン−ボロン系合金等の非晶質組成の金属磁性体を、粉砕法やアトマイズ法などで、平均粒径が１０〜３０μｍの粉末にしたものである。 Among the magnetic material powder and the binder constituting the magnetic material 20, the magnetic material powder is a soft magnetic material having a high saturation magnetic flux density, such as iron or a metal magnetic material mainly composed of iron, such as an iron-nickel alloy, iron- Grinding and atomizing metal magnetic materials with crystalline compositions such as silicon alloys, iron-silicon-aluminum alloys, iron-silicon-chromium alloys, and amorphous compositions such as iron-silicon-boron alloys Etc., and having a mean particle size of 10 to 30 μm.

結合材は、磁性体粉末の粒子を被覆し粒子間に介在して、粒子同士を結合するとともに粒子間に渦電流が流れることを絶縁し、磁性体２０の渦電流損失が大きくなることを抑制するものである。 The binding material covers the particles of the magnetic powder and is interposed between the particles, bonds the particles and insulates that an eddy current flows between the particles, and suppresses an increase in eddy current loss of the magnetic material 20. To do.

結合材は好適には、エポキシ樹脂や、シリコーン樹脂などの絶縁性の熱硬化性樹脂にすることがよく、金属磁性体粉末と混合して粒子間を絶縁し、加圧成形後の熱処理によって結合材を熱硬化させて粒子同士を結合させることができるので好ましい。 The binder is preferably an insulating thermosetting resin such as epoxy resin or silicone resin, mixed with metal magnetic powder to insulate the particles, and bonded by heat treatment after pressure molding This is preferable because the particles can be bonded by thermosetting the material.

そしてこの磁性体２０は、第三方向２０３の下側の底面２１と、この底面２１と反対側の天面２２と、第二方向２０２手前側で底面２１と天面２２を連接した側面２３と、この側面２３と反対側の側面２４と、第一方向２０１の手前側で底面２１と天面２２と側面２３と側面２４を連接した側面２５と、側面２５の反対側で底面２１と天面２２と側面２３と側面２４を連接した側面２６を有した直方体状の形状をしている。 The magnetic body 20 includes a bottom surface 21 below the third direction 203, a top surface 22 opposite to the bottom surface 21, and a side surface 23 connecting the bottom surface 21 and the top surface 22 on the front side in the second direction 202. The side surface 24 opposite to the side surface 23, the bottom surface 21, the top surface 22, the side surface 23 connecting the side surface 23 and the side surface 24 on the front side in the first direction 201, and the bottom surface 21 and the top surface on the opposite side of the side surface 25. It has a rectangular parallelepiped shape having a side face 26 connecting the side face 22, the side face 23, and the side face 24.

また、磁性体２０は少なくとも一対の対向する対向面を有し、図１〜図４に示した例では、側面２３と側面２４が対向した一対の対向面となっている。 Moreover, the magnetic body 20 has at least a pair of opposed surfaces. In the example shown in FIGS. 1 to 4, the magnetic material 20 is a pair of opposed surfaces in which the side surface 23 and the side surface 24 are opposed.

そして、磁性体２０の寸法を本実施の形態では、底面２１を例えば１０．０ｍｍ×１０．０ｍｍ、底面２１と天面２２との間の高さを例えば５．０ｍｍにしている。 In this embodiment, the size of the magnetic body 20 is 10.0 mm × 10.0 mm for the bottom surface 21, and the height between the bottom surface 21 and the top surface 22 is 5.0 mm, for example.

一対の端子３０は、導電性の金属板３１からなり、本実施の形態では金属板３１の厚み寸法ＣＴが０．２ｍｍのリン青銅板からなる。 The pair of terminals 30 is made of a conductive metal plate 31, and in the present embodiment, is made of a phosphor bronze plate having a thickness dimension CT of 0.2 mm.

この端子３０は、磁性体２０に埋設されて固定された埋設部３２と、磁性体２０の外部に露出されて、回路基板（図示せず）との接続に用いられる露出部３３とを有する。 The terminal 30 includes an embedded portion 32 that is embedded and fixed in the magnetic body 20 and an exposed portion 33 that is exposed to the outside of the magnetic body 20 and used for connection to a circuit board (not shown).

そして端子３０は、磁性体２０の側面２３、２４に位置する露出部３３に、露出部３３の幅方向（第一方向２０１）の中央に底面２１の方向（第三方向２０３）に延びて、磁性体２０の方向に落ち込んだ段差部３６を有している。 The terminal 30 extends to the exposed portion 33 located on the side surfaces 23 and 24 of the magnetic body 20 in the center of the exposed portion 33 in the width direction (first direction 201) in the direction of the bottom surface 21 (third direction 203). It has a stepped portion 36 that falls in the direction of the magnetic body 20.

また、磁性体２０の底面２１に位置する露出部３３に、露出部３３の幅方向（第一方向２０１）の中央に側面２３、２４に向かって延びて、磁性体２０の方向に落ち込んだ段差部３７を有している。 Further, a step that extends toward the side surfaces 23 and 24 in the center of the exposed portion 33 in the width direction (first direction 201) and falls in the direction of the magnetic body 20 is located on the exposed portion 33 located on the bottom surface 21 of the magnetic body 20. A portion 37 is provided.

一方、磁性体２０には、段差部３６、３７を収容する収容溝２７、２８が設けられ、イ
ンダクタ１００の外形寸法が大きくならないようにしている。 On the other hand, the magnetic body 20 is provided with housing grooves 27 and 28 for housing the stepped portions 36 and 37 so that the outer dimensions of the inductor 100 do not increase.

さらに露出部３３は、段差部３６と段差部３７の間で、側面２３、２４から底面２１に折り曲げる部分に、折り曲げを容易にするために開口３８が設けられている。 Further, the exposed portion 33 is provided with an opening 38 between the stepped portion 36 and the stepped portion 37 in a portion where the side surface 23, 24 is bent to the bottom surface 21 for easy folding.

そして、露出部３３を側面２３、２４から底面２１に向かって折り曲げる前に、段差部３６、３７に絶縁皮膜が除去されたコイル１０の引き出し部１２を入れて、段差部３６、３７と引き出し部１２が抵抗溶接され、コイル１０と端子３０が電気的に接続されて繋がっている。 Before the exposed portion 33 is bent from the side surfaces 23 and 24 toward the bottom surface 21, the lead portion 12 of the coil 10 from which the insulating film has been removed is put in the step portions 36 and 37, and the step portions 36 and 37 and the lead portion are placed. 12 is resistance welded, and the coil 10 and the terminal 30 are electrically connected to each other.

コイル１０と端子３０が繋げられた露出部３３は、溶融はんだに浸漬するなどして表面にはんだ鍍金３９が形成され、同時に開口３８にはんだが充填された後に、側面２３、２４から底面２１に向かって折り曲げられて、図１に示した表面にはんだ鍍金３９を有する端子３０が形成されている。 The exposed portion 33 where the coil 10 and the terminal 30 are connected is immersed in molten solder to form a solder plating 39 on the surface, and at the same time, the opening 38 is filled with solder, and then from the side surfaces 23 and 24 to the bottom surface 21. The terminal 30 having the solder plating 39 is formed on the surface shown in FIG.

また、一対の端子３０の埋設部３２は、片３４と片３５を有する。 Further, the embedded portion 32 of the pair of terminals 30 has a piece 34 and a piece 35.

片３４は、露出部３３に繋がっており、主面３４ａとこの主面３４ａの反対側の裏面３４ｂを有し、磁性体２０の対向面である側面２３、２４から磁性体２０の内側に向かう方向に伸びている。 The piece 34 is connected to the exposed portion 33, has a main surface 34 a and a back surface 34 b on the opposite side of the main surface 34 a, and faces the inside of the magnetic body 20 from the side surfaces 23 and 24 that are opposite surfaces of the magnetic body 20. It extends in the direction.

また片３５は、片３４と磁性体２０の内側に向かう方向に伸びた先で繋がっており、主面３４ａに繋がる主面３５ａと裏面３４ｂに繋がり且つ主面３５ａの反対側の裏面３５ｂを有している。 The piece 35 is connected to the piece 34 at a tip extending in the direction toward the inside of the magnetic body 20, and has a back surface 35b connected to the main surface 35a and the back surface 34b connected to the main surface 34a and opposite to the main surface 35a. is doing.

そして片３５は、図５に示すように、片３４の裏面３４ｂに片３５の裏面３５ｂを重ね合せるようにした状態で磁性体２０の外側に向かう方向に折れ曲がっている。要するに、埋設部３２は、片３４が磁性体２０の内側に向かう方向に伸びた先で、片３５を折り曲げ軸５０で折り返されている。 As shown in FIG. 5, the piece 35 is bent in a direction toward the outside of the magnetic body 20 with the back surface 35 b of the piece 35 superimposed on the back surface 34 b of the piece 34. In short, the embedded portion 32 is formed by folding the piece 35 with the bending shaft 50 at the point where the piece 34 extends in the direction toward the inside of the magnetic body 20.

ここで、図５（ａ）は、埋設部３２の展開図を示しており、片３５を折り返す折り曲げ軸５０を仮想線の二点差線で示している。図５（ｂ）は、埋設部３２の平面図を示しており、主面３４ａ側（第三方向２０３の上側）から見た図であり、片３５の隠れ線を破線で示している。図５（ｃ）は埋設部３２の側面図であり、第一方向２０１の手前側（あるいは奥側）から見た図を示したものである。 Here, FIG. 5A shows a development view of the embedded portion 32, and the bending axis 50 for folding the piece 35 is indicated by a two-dotted line of virtual lines. FIG. 5B shows a plan view of the embedded portion 32, which is a view seen from the main surface 34a side (the upper side in the third direction 203), and the hidden line of the piece 35 is shown by a broken line. FIG. 5C is a side view of the embedded portion 32 and shows a view seen from the front side (or back side) of the first direction 201.

本実施の形態では、埋設部３２の幅方向（第一方向２０１）の寸法ＷＳを例えば１．５ｍｍ、埋設部３２が磁性体２０に埋め込まれた側面２３、２４から磁性体２０の内側に向かう側の先端までの長さ寸法、すなわち埋設部３２の長さ寸法ＬＳを例えば１．０ｍｍ、折り曲げ軸５０から折り返した片３５の長さ寸法ＲＳを例えば０．３ｍｍにしている。 In the present embodiment, the dimension WS in the width direction (first direction 201) of the embedded portion 32 is 1.5 mm, for example, and the side portions 23 and 24 in which the embedded portion 32 is embedded in the magnetic body 20 are directed to the inside of the magnetic body 20. The length dimension to the tip on the side, that is, the length dimension LS of the embedded portion 32 is, for example, 1.0 mm, and the length dimension RS of the piece 35 folded back from the bending shaft 50 is, for example, 0.3 mm.

以上のように本実施のインダクタ１００が構成されている。 The inductor 100 of this embodiment is configured as described above.

上記した本実施の形態のインダクタ１００によれば、上記構成により、埋設部３２は、露出部３３に繋がり、主面３４ａとこの主面３４ａの反対側の裏面３４ｂを有し、磁性体２０の対向面から磁性体２０の内側に向かう方向に伸びる片３４と、この片３４に繋がり、主面３４ａに繋がる主面３５ａと裏面３４ｂに繋がり且つ主面３５ａの反対側の裏面３５ｂを有し、片３４の裏面３４ｂに裏面３５ｂを重ね合せるようにした状態で磁性体２０の外側に向かう方向に折れ曲がる片３５とを有している。 According to the inductor 100 of the present embodiment described above, with the above configuration, the embedded portion 32 is connected to the exposed portion 33, has a main surface 34a and a back surface 34b opposite to the main surface 34a. A piece 34 extending in the direction from the facing surface toward the inside of the magnetic body 20, a piece 34 connected to the piece 34, a main surface 35a connected to the main surface 34a, a back surface 34b, and a back surface 35b opposite to the main surface 35a; It has a piece 35 that bends in a direction toward the outside of the magnetic body 20 with the back surface 35b superimposed on the back surface 34b of the piece 34.

これにより、端子３０の埋設部３２が磁性体２０から抜け落ちる応力に対して、片３５における磁性体２０の外側に向かう方向の先端の面が抵抗面となって、埋設部３２が磁性体２０から抜け落ちることを防止することができる。 Thus, the surface of the tip 35 in the direction toward the outside of the magnetic body 20 in the piece 35 becomes a resistance surface against the stress that the embedded section 32 of the terminal 30 falls out of the magnetic body 20, and the embedded section 32 is removed from the magnetic body 20. It can be prevented from falling off.

この結果、従来のインダクタのように埋設部に貫通孔を設けることなく、埋設部３２が磁性体２０から抜け落ちることを防止することができるので、従来のインダクタに比べて埋設部３２の長さを短くすることができる。 As a result, it is possible to prevent the embedded portion 32 from falling out of the magnetic body 20 without providing a through hole in the embedded portion as in the conventional inductor, so that the length of the embedded portion 32 is made longer than that of the conventional inductor. Can be shortened.

そして、埋設部３２の長さを短くできることにより、一対の端子３０の埋設部３２の間の間隔を大きくすることができるので、一対の端子３０間の絶縁耐電圧を高くすることができるという効果を得ることができるものである。 And since the space | interval between the embedding part 32 of a pair of terminal 30 can be enlarged because the length of the embedding part 32 can be shortened, the effect that the dielectric strength voltage between a pair of terminals 30 can be made high. Can be obtained.

なお、本実施の形態では、図５に示すように、埋設部３２の磁性体の内側に向かう先端は、片３４の主面３４ａから片３４の裏面３４ｂ側に配設された片３５の主面３５ａに向かって湾曲した湾曲形状を有することができる。 In the present embodiment, as shown in FIG. 5, the leading end of the embedded portion 32 facing the inside of the magnetic body is the main of the piece 35 disposed from the main surface 34a of the piece 34 to the back surface 34b side of the piece 34. It can have a curved shape curved toward the surface 35a.

従来のインダクタでは、埋設部の先端部分が一枚の板状であるため、厚み方向の両端に角があり、この角に電荷が集中しやすくなる。 In the conventional inductor, since the front end portion of the embedded portion has a single plate shape, there are corners at both ends in the thickness direction, and electric charges tend to concentrate on these corners.

しかし、本実施の形態では、片３５を、片３４の裏面３４ｂに裏面３５ｂを重ね合せるようにした状態で磁性体２０の外側に向かう方向に折れ曲がる構成にしたことにより、磁性体２０の内側に向かう埋設部３２の先端を湾曲形状に形成できるので、電荷の集中を分散することができ、一対の端子３０間の絶縁耐電圧をより高くすることを可能とする効果を高めることができる。 However, in the present embodiment, the piece 35 is bent in the direction toward the outside of the magnetic body 20 in a state where the back face 35b is overlapped with the back face 34b of the piece 34, so that the inside of the magnetic body 20 is formed. Since the leading end of the embedded portion 32 that faces is curved, the concentration of electric charges can be dispersed, and the effect of increasing the dielectric strength voltage between the pair of terminals 30 can be enhanced.

また、本実施の形態では、埋設部３２を主面３４ａ側（第三方向２０３の上側）から見たときに、片３４と片３５が重なった部分に、磁性体２０の外側の幅よりも磁性体２０の内側の幅が狭くなる傾斜部４０を有することができる。 Further, in the present embodiment, when the embedded portion 32 is viewed from the main surface 34a side (the upper side in the third direction 203), the portion where the piece 34 and the piece 35 overlap is larger than the outer width of the magnetic body 20. It is possible to have the inclined portion 40 in which the inner width of the magnetic body 20 becomes narrow.

このような本実施の形態の変形例１について図６を参照して説明する。 Such a first modification of the present embodiment will be described with reference to FIG.

図６（ａ）は変形例１における埋設部３２を主面３４ａ側（第三方向２０３の上側）から見た平面図であり、図６（ｂ）は、変形例１における埋設部３２を第一方向２０１の手前側（または奥側）から見た側面図である。 FIG. 6A is a plan view of the embedded portion 32 in the first modification viewed from the main surface 34a side (the upper side in the third direction 203), and FIG. 6B shows the embedded portion 32 in the first modified example. 4 is a side view seen from the front side (or back side) of one direction 201. FIG.

変形例１の埋設部３２は、図５（ａ）で示した片３４と片３５が重なった部分における先端の幅方向（第一方向２０１）の両端の角を、プレス加工で切り落としたり、切削加工したりすることにより、磁性体２０の外側の幅よりも磁性体２０の内側の幅が狭くなる傾斜部４０を形成したものである。 In the embedded portion 32 of the first modification, the corners at both ends in the width direction (first direction 201) of the tip of the portion where the piece 34 and the piece 35 shown in FIG. The inclined portion 40 in which the inner width of the magnetic body 20 is narrower than the outer width of the magnetic body 20 is formed by processing.

この傾斜部４０は、埋設部３２を主面３４ａ側から見たときに、埋設部３２の先端における幅方向の平坦な部分に連続して形成されている。 The inclined portion 40 is formed continuously with a flat portion in the width direction at the tip of the embedded portion 32 when the embedded portion 32 is viewed from the main surface 34a side.

これにより、傾斜部４０を有しない場合の、図５に示した埋設部３２の先端における幅方向の両端の角が９０°であるのに対して、変形例１では、先端に形成される角の角度を鈍角にすることができ、角度が鈍角になることにより、鋭角や直角な角に集中しやすい電荷を傾斜部４０に分散することができ、一対の端子３０間の絶縁耐電圧をより高くすることを可能とする効果を得ることができる。 Thereby, in the case where the inclined portion 40 is not provided, the angle at both ends in the width direction at the tip of the embedded portion 32 shown in FIG. 5 is 90 °, whereas in the first modification, the angle formed at the tip. The obtuse angle can be made to be obtuse, and by making the angle obtuse, electric charges that tend to concentrate on acute and right-angled angles can be dispersed in the inclined portion 40, and the dielectric strength voltage between the pair of terminals 30 can be further increased. The effect which makes it possible to make it high can be acquired.

この場合、埋設部３２の先端における幅方向の平坦な部分に対する傾斜部４０の傾斜角
度θは、１２０°以上、１５０°以下にすることが好ましい。１２０°より小さく、または１５０°より大きくなると、電荷を分散する効果が薄れるので好ましくない。 In this case, it is preferable that the inclination angle θ of the inclined portion 40 with respect to the flat portion in the width direction at the tip of the embedded portion 32 is 120 ° or more and 150 ° or less. When the angle is smaller than 120 ° or larger than 150 °, the effect of dispersing the charge is not preferable.

また、傾斜部４０を有する別の変形例について図７を参照して説明する。 Another modification having the inclined portion 40 will be described with reference to FIG.

図７は本実施の形態の変形例２を示しており、図７（ａ）は、変形例２における埋設部３２の展開図を示しており、片３５を折り返す折り曲げ軸５０を仮想線の二点差線で示している。図７（ｂ）は、変形例２における埋設部３２の平面図を示しており、主面３４ａ側（第三方向２０３の上側）から見た図であり、片３５の隠れ線を破線で示している。図７（ｃ）は変形例２における埋設部３２の側面図であり、第一方向２０１の手前側（あるいは奥側）から見た図を示している。 FIG. 7 shows a second modification of the present embodiment, and FIG. 7A shows a development view of the embedded portion 32 in the second modification. The folding shaft 50 that folds the piece 35 is connected to two imaginary lines. This is indicated by a dotted line. FIG. 7B shows a plan view of the embedded portion 32 in the second modification, and is a view seen from the main surface 34a side (the upper side in the third direction 203), and the hidden line of the piece 35 is shown by a broken line. Yes. FIG. 7C is a side view of the embedded portion 32 in the second modification, and shows a view seen from the front side (or the back side) in the first direction 201.

この変形例２の埋設部３２は、片３５を折り返すまでに、予め折り曲げ軸５０に対して線対称となる傾斜部４０を片３４、３５に形成しておき、片３５を折り曲げ軸５０で折り曲げて線対称に形成した傾斜部４０を重ね合わせることにより、傾斜部４０が形成されたものである。 In the embedded portion 32 of the second modification, before the piece 35 is folded, an inclined portion 40 that is axisymmetric with respect to the bending axis 50 is formed in the pieces 34 and 35 in advance, and the piece 35 is bent by the bending shaft 50. The inclined portions 40 are formed by overlapping the inclined portions 40 formed in line symmetry.

この傾斜部４０は、埋設部３２を主面３４ａ側から見たときに、埋設部３２の先端における幅方向の平坦な部分と非連続に形成されている。 The inclined portion 40 is formed discontinuously with a flat portion in the width direction at the tip of the embedded portion 32 when the embedded portion 32 is viewed from the main surface 34a side.

この傾斜部４０の傾斜角θは、図６に示した変形例１と同様に１２０°以上、１５０°以下にすることが好ましい。 The inclination angle θ of the inclined portion 40 is preferably set to 120 ° or more and 150 ° or less as in the first modification shown in FIG.

これにより、変形例１に比べて効果は小さくなるものの、埋設部３２の先端の角に集中しやすい電荷を傾斜部４０に分散させやすくすることができる。 As a result, although the effect is smaller than that of the first modification, it is possible to easily disperse the charges that tend to concentrate on the corners of the tip of the embedded portion 32 in the inclined portion 40.

変形例２が変形例１に比べて効果が小さくなる理由としては、傾斜部４０と埋設部３２の先端における幅方向の平坦な部分との間に、金属板３１の厚みに起因した直角となる角ができるためである。 The reason why the modified example 2 is less effective than the modified example 1 is a right angle due to the thickness of the metal plate 31 between the inclined portion 40 and the flat portion in the width direction at the tip of the embedded portion 32. This is because a corner is formed.

しかしながら、埋設部３２の先端における幅方向の平坦な部分の近傍に傾斜部４０が位置するため、傾斜部４０にも電荷を分散させることができ、図５に示した埋設部３２に比べて、一対の端子３０間の絶縁耐電圧を高くすることができるものである。 However, since the inclined portion 40 is located in the vicinity of the flat portion in the width direction at the tip of the embedded portion 32, charges can be dispersed also in the inclined portion 40, compared with the embedded portion 32 shown in FIG. The withstand voltage between the pair of terminals 30 can be increased.

そして、本実施の形態では、埋設部３２を主面３４ａ側（第三方向２０３の上側）から見たときに、片３４と片３５が重なった部分に、磁性体２０の外側の幅よりも磁性体２０の内側の幅が狭くなるＲ部４１を有することができる。 And in this Embodiment, when the embedding part 32 is seen from the main surface 34a side (the upper side of the 3rd direction 203), it is in the part which the piece 34 and the piece 35 overlapped rather than the outer width | variety of the magnetic body 20. It is possible to have the R portion 41 in which the inner width of the magnetic body 20 is narrowed.

このような変形例について図８を参照して説明する。 Such a modification will be described with reference to FIG.

図８は本実施の形態の変形例３を示しており、図８（ａ）は変形例３における埋設部３２を主面３４ａ側（第三方向２０３の上側）から見た平面図であり、図８（ｂ）は、変形例３における埋設部３２を第一方向２０１の手前側（または奥側）から見た側面図である。 FIG. 8 shows a third modification of the present embodiment, and FIG. 8A is a plan view of the embedded portion 32 in the third modification when viewed from the main surface 34a side (the upper side in the third direction 203). FIG. 8B is a side view of the burying portion 32 according to Modification 3 as viewed from the front side (or the back side) in the first direction 201.

この変形例３の埋設部３２は、図５（ａ）で示した片３４と片３５が重なった部分における先端の幅方向（第一方向２０３）の両端の角を、プレス加工で切り落としたり、切削加工したりすることにより、磁性体２０の外側の幅よりも磁性体２０の内側の幅が狭くなるＲ部４１を形成したものである。 In the embedded portion 32 of the third modification, the corners at both ends in the width direction (first direction 203) of the tip of the portion where the piece 34 and the piece 35 shown in FIG. The R portion 41 in which the inner width of the magnetic body 20 becomes narrower than the outer width of the magnetic body 20 by cutting is formed.

このＲ部４１は、埋設部３２を主面３４ａ側から見たときに、埋設部３２の先端における幅方向の平坦な部分に連続して形成されている。 The R portion 41 is formed continuously with a flat portion in the width direction at the tip of the embedded portion 32 when the embedded portion 32 is viewed from the main surface 34a side.

これにより、Ｒ部４１を有しない場合の、図５（ａ）に示した埋設部３２の先端における幅方向の両端の角が９０°であるのに対して、変形例３では、先端に形成される角が無くなり、埋設部３２先端全体に電荷を分散することができ、一対の端子３０間の絶縁耐電圧をより高くすることを可能とする効果を得ることができる。 As a result, the corners at both ends in the width direction at the tip of the embedded portion 32 shown in FIG. 5A when the R portion 41 is not provided are 90 °, whereas in the third modification, the tip is formed at the tip. As a result, there is no corner, the charge can be distributed over the entire tip of the embedded portion 32, and the effect of increasing the dielectric strength voltage between the pair of terminals 30 can be obtained.

さらに、Ｒ部４１を有する別の変形例について図９を参照して説明する。 Furthermore, another modified example having the R portion 41 will be described with reference to FIG.

図９は本実施の形態の変形例４を示しており、図９（ａ）は、変形例４における埋設部３２の展開図を示しており、片３５を折り返す折り曲げ軸５０を仮想線の二点差線で示している。図９（ｂ）は、変形例４における埋設部３２の平面図を示しており、主面３４ａ側（第三方向２０３の上側）から見た図であり、片３５の隠れ線を破線で示している。図９（ｃ）は変形例４における埋設部３２の側面図であり、第一方向２０１の手前側（あるいは奥側）から見た図を示している。 FIG. 9 shows a fourth modification of the present embodiment, and FIG. 9A shows a development view of the embedded portion 32 in the fourth modification. The folding shaft 50 that folds the piece 35 is connected to two imaginary lines. This is indicated by a dotted line. FIG. 9B shows a plan view of the buried portion 32 in the modified example 4, and is a view seen from the main surface 34a side (the upper side of the third direction 203), and the hidden line of the piece 35 is shown by a broken line. Yes. FIG. 9C is a side view of the embedded portion 32 in the fourth modification, and shows a view seen from the front side (or the back side) in the first direction 201.

この変形例４の埋設部３２は、片３５を折り返すまでに、予め折り曲げ軸５０に対して線対称となるＲ部４１を片３４、３５に形成しておき、片３５を折り曲げ軸５０で折り曲げて線対称に形成したＲ部４１を重ね合わせることにより、Ｒ部４１が形成されたものである。 In the embedded portion 32 of this modified example 4, before the piece 35 is folded, an R portion 41 that is axisymmetric with respect to the bending axis 50 is formed in the pieces 34 and 35 in advance, and the piece 35 is bent with the bending axis 50. The R portion 41 is formed by superimposing the R portions 41 formed in line symmetry.

このＲ部４１は、埋設部３２を主面３４ａ側から見たときに、埋設部３２の先端における幅方向の平坦な部分と非連続に形成されている。 The R portion 41 is formed discontinuously with the flat portion in the width direction at the tip of the embedded portion 32 when the embedded portion 32 is viewed from the main surface 34a side.

これにより、変形例３に比べて効果は小さくなるものの、埋設部３２の先端の角に集中しやすい電荷をＲ部４１に分散させやすくすることができる。 As a result, although the effect is smaller than that of the modified example 3, it is possible to easily disperse the charges that tend to concentrate at the corners of the tip of the embedded portion 32 in the R portion 41.

変形例４が変形例３に比べて効果が小さくなる理由としては、Ｒ部４１と埋設部３２の先端における幅方向の平坦な部分との間に、金属板３１の厚みに起因した直角となる角ができるためである。 The reason why the modified example 4 is less effective than the modified example 3 is that the right angle is caused by the thickness of the metal plate 31 between the R portion 41 and the flat portion in the width direction at the tip of the embedded portion 32. This is because a corner is formed.

しかしながら、埋設部３２の先端における幅方向の平坦な部分の近傍にＲ部４１が位置するため、電荷をＲ部４１にも分散させることができ、図５に示した埋設部３２に比べて、一対の端子３０間の絶縁耐電圧をより高くすることを可能とする効果を得ることができる。 However, since the R portion 41 is positioned in the vicinity of the flat portion in the width direction at the tip of the embedded portion 32, the charge can be dispersed also in the R portion 41, compared with the embedded portion 32 shown in FIG. It is possible to obtain an effect that makes it possible to further increase the withstand voltage between the pair of terminals 30.

また、本実施の形態では、埋設部３２を主面３４ａ側から見たときに、片３４の幅より片３５の幅を広くすることができる。 In the present embodiment, the width of the piece 35 can be made wider than the width of the piece 34 when the embedded portion 32 is viewed from the main surface 34a side.

このような本実施の形態の変形例５について図１０を参照して説明する。 Modification 5 of the present embodiment will be described with reference to FIG.

図１０は変形例５を示しており、図１０（ａ）は、変形例５における埋設部３２の展開図を示しており、片３５を折り返す折り曲げ軸５０を仮想線の二点差線で示している。図１０（ｂ）は、変形例５における埋設部３２の平面図を示しており、主面３４ａ側（第三方向２０３の上側）から見た図であり、第一片３４の隠れ線を破線で示している。図１０（ｃ）は変形例５における埋設部３２の側面図であり、第一方向２０１の手前側（あるいは奥側）から見た図を示している。 FIG. 10 shows a fifth modification, and FIG. 10 (a) shows a development view of the embedded portion 32 in the fifth modification, in which the bending axis 50 that folds the piece 35 is indicated by a two-dotted line of phantom lines. Yes. FIG. 10B shows a plan view of the embedded portion 32 in the modified example 5, and is a view seen from the main surface 34a side (the upper side of the third direction 203), and the hidden line of the first piece 34 is indicated by a broken line. Show. FIG. 10C is a side view of the embedded portion 32 in the fifth modification, and shows a view seen from the front side (or the back side) in the first direction 201.

図１０に示すように変形例５の埋設部３２は、片３５に、片３５の幅方向に繋がる拡幅
部４２を有し、片３４の幅ＷＳより片３５の幅ＢＷを広くしたものである。 As shown in FIG. 10, the embedded portion 32 of the modified example 5 has a widened portion 42 connected to the piece 35 in the width direction of the piece 35, and the width BW of the piece 35 is made wider than the width WS of the piece 34. .

これにより、片３５における磁性体２０の外側に向かう方向の先端の面の面積が大きくなって、埋設部３２が磁性体２０から抜け落ちる応力に対してより抵抗力を大きくすることができる。 Thereby, the area of the surface of the tip of the piece 35 in the direction toward the outside of the magnetic body 20 is increased, and the resistance force can be increased against the stress that the embedded portion 32 falls out of the magnetic body 20.

この結果、埋設部３２の長さ寸法をより短くすることができるので、一対の端子３０の埋設部３２間の間隔が大きくなり、一対の端子３０間の絶縁耐電圧をより高くすることを可能とする効果を得ることができる。 As a result, since the length of the embedded portion 32 can be further shortened, the interval between the embedded portions 32 of the pair of terminals 30 is increased, and the dielectric strength voltage between the pair of terminals 30 can be further increased. The effect that can be obtained can be obtained.

そして、本実施の形態では、埋設部３２を主面３４ａ側から見たときに、片３４は、片３４と片３５が重ならない部分に、片３４の幅方向の端面から片３４の内側に向かって切り欠かれた切り欠き部６０を有することができる。 In the present embodiment, when the embedded portion 32 is viewed from the main surface 34a side, the piece 34 is located in a portion where the piece 34 and the piece 35 do not overlap, and from the end surface in the width direction of the piece 34 to the inside of the piece 34. It can have a notch 60 that is cut away.

このような本実施の形態の変形例６について図１１を参照して説明する。 Modification 6 of the present embodiment will be described with reference to FIG.

図１１は変形例６を示しており、図１１（ａ）は、変形例６における埋設部３２の展開図を示しており、第一片３４を折り返す折り曲げ軸５０を仮想線の二点差線で示している。図１１（ｂ）は、変形例６における埋設部３２の平面図を示しており、主面３４ａ側（第三方向２０３の上側）から見た図であり、第一片３４の隠れ線を破線で示している。図１１（ｃ）は変形例６における埋設部３２の側面図であり、第一方向２０１の手前側（あるいは奥側）から見た図を示している。 FIG. 11 shows a sixth modified example, and FIG. 11A shows a development view of the embedded portion 32 in the sixth modified example, and the folding shaft 50 that folds the first piece 34 is shown by a two-dot phantom line. Show. FIG. 11B shows a plan view of the embedded portion 32 in the modified example 6, and is a view seen from the main surface 34a side (the upper side in the third direction 203), and the hidden line of the first piece 34 is indicated by a broken line. Show. FIG. 11C is a side view of the embedded portion 32 in the modified example 6, and shows a view seen from the front side (or the back side) in the first direction 201.

図１１に示すように変形例６の埋設部３２は、埋設部３２が埋め込まれた側面２３、２４と片３５との間、すなわち片３４の片３５と重ならない部分に、片３４の幅方向の端面から片３４の内側に向かって厚さ方向に切り欠かれた半円形状の切り欠き部６０を有している。 As shown in FIG. 11, the embedded portion 32 of the modified example 6 has a width direction of the piece 34 between the side surfaces 23, 24 in which the embedded portion 32 is embedded and the piece 35, that is, a portion that does not overlap the piece 35 of the piece 34. A semicircular cutout portion 60 is cut out in the thickness direction from the end face toward the inside of the piece 34.

なお、この切り欠き部６０の形状は、半円形状に限定されるものではなく、矩形状や三角形状のものなどでもよく、また複数有していてもよい。 Note that the shape of the notch 60 is not limited to a semicircular shape, and may be a rectangular shape or a triangular shape, or may have a plurality.

これにより、磁性体２０を形成する磁性材料が切り欠き部６０に充填され、磁性材料と接触する埋設部３２の面積が大きくなって、埋設部３２が磁性体２０から抜け落ちる応力に対してより抵抗力を大きくすることができる。 As a result, the magnetic material forming the magnetic body 20 is filled in the cutout portion 60, the area of the embedded portion 32 in contact with the magnetic material is increased, and the embedded portion 32 is more resistant to the stress that falls off the magnetic body 20. The power can be increased.

さらに、本実施の形態では、片３５は、磁性体２０の外側に向かう先端の面に、磁性体２０の内側に向かって切り欠かれた切り欠き部６１を有することができる。 Further, in the present embodiment, the piece 35 can have a cutout portion 61 cut out toward the inside of the magnetic body 20 on the surface of the tip that faces the outside of the magnetic body 20.

このような本実施の形態の変形例７について図１２を参照して説明する。 Modification 7 of this embodiment will be described with reference to FIG.

図１２は変形例７を示しており、図１２（ａ）は、変形例７における埋設部３２の展開図を示しており、片３５を折り返す折り曲げ軸５０を仮想線の二点差線で示している。図１２（ｂ）は、変形例７における埋設部３２の平面図を示しており、主面３４ａ側（第三方向２０３の上側）から見た図であり、片３５の隠れ線を破線で示している。図１２（ｃ）は変形例７における埋設部３２の側面図であり、第一方向２０１の手前側（あるいは奥側）から見た図を示している。 FIG. 12 shows a modified example 7, and FIG. 12 (a) shows a development view of the embedded portion 32 in the modified example 7. The folding shaft 50 that folds the piece 35 is indicated by a two-dotted line of phantom lines. Yes. FIG. 12B shows a plan view of the embedded portion 32 in the modified example 7, which is a view seen from the main surface 34a side (the upper side of the third direction 203), and shows a hidden line of the piece 35 by a broken line. Yes. FIG. 12C is a side view of the embedded portion 32 in the modified example 7, and shows a view seen from the front side (or the back side) in the first direction 201.

図１２のように変形例７の片３５は、埋設部３２が埋め込まれた側面２３、２４と対向する面、すなわち磁性体２０の外側に向かう方向の先端の面に、磁性体２０の内側に向かって半楕円形状に切り欠かれた切り欠き部６１を有している。 As shown in FIG. 12, the piece 35 of the modified example 7 is formed on the surface facing the side surfaces 23 and 24 embedded with the embedded portion 32, that is, on the surface of the tip in the direction toward the outside of the magnetic body 20, and on the inside of the magnetic body 20. It has a cutout portion 61 cut out in a semi-elliptical shape.

この切り欠き部６１は、半楕円形状に限定されるものではなく、半円形状や矩形状、あるいは三角形状のものでもよく、また、複数有していてもよい。 The notch 61 is not limited to a semi-elliptical shape, and may be a semi-circular shape, a rectangular shape, or a triangular shape, or may have a plurality.

これにより、磁性体２０を形成する磁性材料が切り欠き部６１に充填され、磁性材料と接触する片３５の面積が大きくなって、埋設部３２が磁性体２０から抜け落ちる応力に対してより抵抗力を大きくすることができる。 As a result, the magnetic material forming the magnetic body 20 is filled in the notch 61, the area of the piece 35 in contact with the magnetic material is increased, and the embedded portion 32 is more resistant to the stress that falls off the magnetic body 20. Can be increased.

なお、本実施の形態では、図１〜図４に示すように、端子３０は、埋設部３２を露出部３３の幅方向の両端に一対有することができる。 In the present embodiment, as shown in FIGS. 1 to 4, the terminal 30 can have a pair of embedded portions 32 at both ends in the width direction of the exposed portion 33.

これにより、端子３０が磁性体２０からより抜け落ちにくくすることができ、より埋設部２２の長さ寸法を短くすることができるので、一対の端子３０間の絶縁耐電圧をより高くすることを可能とする効果を得ることができるものである。 As a result, the terminal 30 can be more easily removed from the magnetic body 20, and the length of the embedded portion 22 can be further shortened, so that the dielectric strength voltage between the pair of terminals 30 can be further increased. The effect which can be obtained can be obtained.

上述のように、本実施の形態のインダクタ１００は、対向する一対の対向面（側面２３、２４）を有する磁性体２０と、磁性体２０に埋設されるコイル１０と、金属板３１からなり、コイル１０の両端にそれぞれ繋がり磁性体２０の一対の対向面である側面２３、２４に配設される、一対の端子３０と、を有し、端子３０は、磁性体２０に埋設される、埋設部３２と、磁性体２０の外部に露出する、露出部３３と、を有し、埋設部３２は、露出部３３に繋がり、主面３４ａとこの主面３４ａの反対側の裏面３４ｂを有し、磁性体２０の対向面（側面２３、２４）から磁性体２０の内側に向かう方向に伸びる片３４と、この片３４に繋がり、主面３４ａに繋がる主面３５ａと裏面３４ｂに繋がり且つ主面３５ａの反対側の裏面３５ｂを有し、片３４の裏面３４ｂに裏面３５ｂを重ね合せるようにした状態で磁性体２０の外側に向かう方向に折れ曲がる片３５と、を有する。 As described above, the inductor 100 according to the present embodiment includes the magnetic body 20 having a pair of opposing surfaces (side surfaces 23 and 24), the coil 10 embedded in the magnetic body 20, and the metal plate 31. A pair of terminals 30 that are respectively connected to both ends of the coil 10 and disposed on the side surfaces 23 and 24 that are a pair of opposing surfaces of the magnetic body 20, and the terminals 30 are embedded in the magnetic body 20. Part 32 and exposed part 33 exposed to the outside of magnetic body 20, and embedded part 32 is connected to exposed part 33 and has a main surface 34a and a back surface 34b opposite to main surface 34a. , A piece 34 extending in the direction from the opposing surface (side surfaces 23, 24) of the magnetic body 20 toward the inside of the magnetic body 20, and a main surface 35a connected to the piece 34 and connected to the main surface 34a and a back surface 34b. It has a back surface 35b opposite to 35a, It has a piece 35 bent toward the outer side of the magnetic body 20, in a state in which the fourth rear surface 34b was set to superimposed the back surface 35b.

また、埋設部３２の磁性体２０の内側に向かう先端は、片３４の主面３４ａから片３４の裏面３４ｂ側に配設された片３５の主面３５ａ向かって湾曲した湾曲形状を有する。 Further, the tip of the embedded portion 32 toward the inside of the magnetic body 20 has a curved shape curved from the main surface 34a of the piece 34 toward the main surface 35a of the piece 35 disposed on the back surface 34b side of the piece 34.

そして、埋設部３２を主面３４ａから見たときに、片３４と３５片が重なった部分は、磁性体２０の外側の幅よりも磁性体２０の内側の幅が狭くなる傾斜部４０を有することができる。 When the embedded portion 32 is viewed from the main surface 34 a, the portion where the pieces 34 and 35 overlap each other has the inclined portion 40 in which the inner width of the magnetic body 20 is narrower than the outer width of the magnetic body 20. be able to.

さらに、埋設部３２を主面３４ａ側から見たときに、片３４と片３５が重なった部分は、磁性体２０の外側の幅よりも磁性体２０の内側の幅が狭くなるＲ部４１を有することができる。 Further, when the embedded portion 32 is viewed from the main surface 34 a side, the portion where the piece 34 and the piece 35 overlap is an R portion 41 in which the inner width of the magnetic body 20 is narrower than the outer width of the magnetic body 20. Can have.

そしてまた、埋設部３２を主面３４ａ側から見たときに、片３４の幅より片３５の幅を広くすることができる。 Further, the width of the piece 35 can be made wider than the width of the piece 34 when the embedded portion 32 is viewed from the main surface 34a side.

さらにまた、埋設部３２を主面３４ａ側から見たときに、３４片は、片３４と片３５が重ならない部分に、片３４の幅方向の端面から片３４の内側に向かって切り欠かれた切り
欠き部６０を有することができる。 Furthermore, when the embedded portion 32 is viewed from the main surface 34a side, the 34 pieces are cut out from the end face in the width direction of the piece 34 toward the inside of the piece 34 in a portion where the pieces 34 and 35 do not overlap. A notch 60 can be provided.

また、片は３５、磁性体２０の外側に向かう方向の先端の面に、磁性体２０の内側に向かって切り欠かれた切り欠き部６１を有することができる。 Further, the piece 35 can have a notch 61 cut out toward the inside of the magnetic body 20 on the surface of the tip in the direction toward the outside of the magnetic body 20.

そして、端子３０は、一対の埋設部３２を有することができるものである。 The terminal 30 can have a pair of embedded portions 32.

本発明に係るインダクタの構成は、一対の端子間の絶縁耐電圧を高くすることを可能とすることができ、産業上有用である。 The configuration of the inductor according to the present invention can increase the dielectric strength voltage between a pair of terminals, and is industrially useful.

１０コイル
１１導線
１２引き出し部
２０磁性体
２１底面
２２天面
２３側面（第一側面、対向面）
２４側面（第二側面、対向面）
２５側面（第三側面）
２６側面（第四側面）
２７収容溝（第一収容溝）
２８収容溝（第二収容溝）
３０端子
３１金属板
３２埋設部
３３露出部
３４片（第一片）
３４ａ主面（第一主面）
３４ｂ裏面（第一裏面）
３５片（第二片）
３５ａ主面（第二主面）
３５ｂ裏面（第二裏面）
３６段差部（第一段差部）
３７段差部（第二段差部）
３８開口
３９はんだ鍍金
４０傾斜部
４１Ｒ部
４２拡幅部
５０折り曲げ軸
６０切り欠き部（第一切り欠き部）
６１切り欠き部（第二切り欠き部） DESCRIPTION OF SYMBOLS 10 Coil 11 Conductor 12 Lead part 20 Magnetic body 21 Bottom surface 22 Top surface 23 Side surface (1st side surface, opposing surface)
24 side (second side, opposite side)
25 Side (third side)
26 Side (4th side)
27 receiving groove (first receiving groove)
28 accommodation groove (second accommodation groove)
30 Terminal 31 Metal plate 32 Buried part 33 Exposed part 34 Piece (first piece)
34a Main surface (first main surface)
34b Back side (first back side)
35 pieces (second piece)
35a Main surface (second main surface)
35b Back side (second back side)
36 Step part (first step part)
37 Step part (second step part)
38 Opening 39 Solder plating 40 Inclined part 41 R part 42 Widened part 50 Bending shaft 60 Notch part (first notch part)
61 Notch (second notch)

Claims

A magnetic material having a pair of opposing surfaces;
A coil embedded in the magnetic body;
A pair of terminals made of a metal plate, connected to both ends of the coil and disposed on the pair of opposing surfaces of the magnetic body,
The terminal is embedded in the magnetic body; and
An exposed portion that is exposed to the outside of the magnetic body,
The buried portion is
A first piece connected to the exposed portion, having a first main surface and a first back surface opposite to the first main surface, extending in a direction from the facing surface of the magnetic body toward the inside of the magnetic body;
A second main surface connected to the first main surface, connected to the first main surface and a second back surface on the opposite side of the second main surface and connected to the first main surface; A second piece that is bent in a direction toward the outside of the magnetic body in a state in which the second back surface is superimposed on the back surface;
Having an inductor.

The tip of the embedded portion facing the inside of the magnetic body curves from the first main surface of the first piece toward the second main surface of the second piece disposed on the first back side of the first piece. The inductor according to claim 1, wherein the inductor has a curved shape.

When the embedded portion is viewed from the first main surface side, the width of the inside of the magnetic body is narrower than the width of the outside of the magnetic body at the portion where the first piece and the second piece overlap. Having an inclined part,
The inductor according to claim 1.

When the embedded portion is viewed from the first main surface side, the width of the inside of the magnetic body is narrower than the width of the outside of the magnetic body at the portion where the first piece and the second piece overlap. Having R part,
The inductor according to claim 1.

When the embedded portion is viewed from the first main surface side, the width of the second piece is wider than the width of the first piece.
The inductor according to claim 1.

When the embedded portion is viewed from the first main surface side, the first piece is located on the portion where the first piece and the second piece do not overlap with each other from the end face in the width direction of the first piece. Having a first notch cut out toward the inside of the
The inductor according to claim 1.

The second piece has a second cutout portion that is cut out toward the inside of the magnetic body on a front end surface in a direction toward the outside of the magnetic body.
The inductor according to claim 1.

The inductor according to claim 1, wherein the terminal has a pair of embedded portions.