JPH07288210A - Surface mount inductor - Google Patents

Surface mount inductor

Info

Publication number
JPH07288210A
JPH07288210A JP10168794A JP10168794A JPH07288210A JP H07288210 A JPH07288210 A JP H07288210A JP 10168794 A JP10168794 A JP 10168794A JP 10168794 A JP10168794 A JP 10168794A JP H07288210 A JPH07288210 A JP H07288210A
Authority
JP
Japan
Prior art keywords
ferrite
wire
lead
annular
ferrite core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP10168794A
Other languages
Japanese (ja)
Inventor
Minoru Takahashi
実 高橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Corp
Original Assignee
TDK Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TDK Corp filed Critical TDK Corp
Priority to JP10168794A priority Critical patent/JPH07288210A/en
Publication of JPH07288210A publication Critical patent/JPH07288210A/en
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To provide a surface mount inductor available for the use of the d-c superimposing or other various uses by forming a columnar magnetic piece separate from a ferrite core surrounding an annular coil into which this piece is inserted and set. CONSTITUTION:An outer core structure 1 composed of a first ferrite core 10 having a coil fitting recess and electrodes 14 formed on its outside and second ferrite core 20 having a coil fitting recess 21 and annular coil 2 has wound wires settled by an adhesive material like an annular shape and having lead parts 31 and 32 at the winding start and end and is fitted in the recesses 11 and 21 of the core structure 1. A columnar magnetic piece 3 is separate from the first and second ferrite cores 10 and 20 and inserted in a central opening of the coil 2.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、プリント基板に表面実
装可能な電極を有する高さの低い構造で、直流重畳用等
の用途に適した表面実装用インダクタに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-mounting inductor having a low-height structure having a surface-mountable electrode on a printed circuit board and suitable for applications such as DC superposition.

【0002】[0002]

【従来の技術】表面実装部品は、電子機器製品の小型
化、薄型化が進むのに伴い益々小型になり、その要求も
単に従来品の小型化(単に寸法を小さくする)では生産
コストも含め対応が難しくなってきている。
2. Description of the Related Art Surface-mounted components are becoming smaller and smaller as electronic equipment products are becoming smaller and thinner, and the requirements are not limited to simply reducing the size of conventional products (simply reducing the size) to include production costs. It is becoming difficult to respond.

【0003】特に、直流電流を重畳するノイズフィルタ
部品、スイッチング電源の平滑チョーク、非絶縁型のO
N制御型コンバータ(フォワード・コンバータ)及びO
FF制御型コンバータ(フライバック・コンバータ)の
チョーク等を小型化及び面実装化(SMD化)したもの
は製品化されていなかった。その理由は以下の通りであ
る。
In particular, noise filter parts for superimposing DC current, smoothing chokes for switching power supplies, non-insulating O
N control type converter (forward converter) and O
FF control type converters (flyback converters) such as chokes and the like that have been downsized and surface-mounted (SMD) have not been commercialized. The reason is as follows.

【0004】(1) ノイズフィルタ部品、スイッチング
電源用チョーク等では必要な電流容量を確保するため
に、線輪を構成する線材の線径が増大するが、その端部
を面装着端子(SMD端子)に接続することは、からげ
や溶接での継線の信頼性が充分でない嫌いがあった。
(1) In noise filter parts, chokes for switching power supplies, etc., in order to secure the necessary current capacity, the wire diameter of the wire material that composes the wire loop increases, but its ends are surface-mounted terminals (SMD terminals). ), There was a dislike that the reliability of the splice wire in brazing or welding was not sufficient.

【0005】(2) 形状を小型にすれば磁気コアも小型
になり、磁路長も短くなり、線輪に直流を重畳するとコ
アが僅かな電流で飽和してしまう。また、磁気コアにエ
アーギャップを形成し、磁気飽和を防止してもインダク
タンスがとれず、充分なコイルとしての機能が果たせな
くなってしまう。
(2) If the shape is made small, the magnetic core becomes small, the magnetic path length becomes short, and when a direct current is superposed on the coil, the core is saturated with a slight current. In addition, even if an air gap is formed in the magnetic core to prevent magnetic saturation, the inductance cannot be taken and the coil cannot function sufficiently.

【0006】なお、従来提案されている小型インダクタ
としては、一対のポット型コア内に線輪を配置して線輪
引き出し端部をコアの一部に形成された絡げ部に絡げる
ものがある(実開平5−6814号)。しかし、やは
り、上記(1),(2)の問題を内包している。
As a conventionally proposed small-sized inductor, a coil is arranged in a pair of pot-type cores, and a loop-out end portion of the coil is entwined with a entangled portion formed in a part of the core. There is (Saikaihei 5-6814). However, it still includes the problems of (1) and (2) above.

【0007】[0007]

【発明が解決しようとする課題】上述したように、直流
電流を重畳する用途等に用いる小型かつ薄型の表面実装
用インダクタの場合、磁気コアの磁気飽和の問題を解決
する必要があり、従来一般的なポット型コア(外周部と
中央の柱状部とを平板部で一体に連結したもの)を用い
たのでは対応できない。
As described above, in the case of a small and thin surface mounting inductor used for superimposing a DC current, it is necessary to solve the problem of magnetic saturation of the magnetic core. It is not possible to use a conventional pot-type core (in which the outer peripheral portion and the central columnar portion are integrally connected by a flat plate portion).

【0008】本発明は、上記の点に鑑み、環状線輪の中
心穴に挿入、配置する柱状磁性体を、前記環状線輪の外
側を囲むフェライトコアとは別体にしたことにより、直
流重畳の用途やその他の多様な用途に対応可能な表面実
装用インダクタを提供することを目的とする。
In view of the above points, the present invention makes the columnar magnetic body to be inserted and arranged in the center hole of the annular coil separate from the ferrite core surrounding the outside of the annular coil, so that the direct current superposition is achieved. It is an object of the present invention to provide a surface-mount inductor that can be used for various applications and other various applications.

【0009】[0009]

【課題を解決するための手段】上記目的を達成するため
に、本発明の表面実装用インダクタは、線輪収納凹部が
形成されるとともに少なくとも側面に電極が形成されて
いる第1のフェライトコアと、前記線輪収納凹部を塞ぐ
如く前記第1のフェライトコアに接着される第2のフェ
ライトコアとからなる外殻コア構造体と、巻回された線
材が接着性物質で環状形状に固定され、少なくとも巻始
めと巻終わりにリード部を持っていて前記外殻コア構造
体内の線輪収納凹部に配置される環状線輪と、前記第1
及び第2フェライトコアとは別体であって前記環状線輪
の中心穴に挿置される柱状磁性体とを備えている。そし
て、前記リード部が前記電極にそれぞれ接続された構成
となっている。
In order to achieve the above object, a surface mounting inductor according to the present invention comprises a first ferrite core having a recess for accommodating a wire ring and an electrode formed on at least a side surface thereof. An outer shell core structure composed of a second ferrite core adhered to the first ferrite core so as to close the recess for accommodating the wire wheel, and the wound wire rod is fixed in an annular shape by an adhesive substance, An annular coil having lead portions at least at the beginning and at the end of winding and arranged in a coil-housing recess in the outer shell core structure;
And a columnar magnetic body that is separate from the second ferrite core and that is inserted into the center hole of the annular coil. The lead portions are connected to the electrodes, respectively.

【0010】ここで、前記線材は表面を絶縁処理した金
属箔であってもよい。
Here, the wire may be a metal foil whose surface is subjected to an insulation treatment.

【0011】また、前記外殻コア構造体内の前記線輪収
納凹部に前記環状線輪が複数個配置されていてもよい。
Further, a plurality of the annular wire rings may be arranged in the wire ring housing recess in the outer shell core structure.

【0012】前記第1のフェライトコアが高抵抗フェラ
イトであり、当該第1のフェライトの突き合わせ面にリ
ード部導出用溝部を形成し、該リード部導出用溝部の底
面に前記電極の延長部分を形成するとともに、該延長部
分に前記リード部を溶着する構成としてもよい。
The first ferrite core is a high resistance ferrite, a lead portion leading groove portion is formed on the abutting surface of the first ferrite, and an extension portion of the electrode is formed on the bottom surface of the lead portion leading groove portion. In addition, the lead portion may be welded to the extended portion.

【0013】[0013]

【作用】本発明の表面実装用インダクタにおいては、環
状線輪を囲む第1及び第2のフェライトコアとは別体の
柱状磁性体を前記環状線輪の中心穴に挿入、配置してお
り、用途に応じて柱状磁性体の磁気特性を適切に設定す
ることができる。例えば、環状線輪に直流電流を重畳す
る用途では、柱状磁性体として飽和磁束密度の大きい磁
性材料(例えば、センダスト等)を使用することで磁気
飽和を防止することができる。また、柱状磁性体と第1
及び第2のフェライトコアとの間に微小エアーギャップ
(磁気ギャップ)が発生するため、この微小エアーギャ
ップも磁気飽和防止に寄与できる。
In the surface mounting inductor of the present invention, the columnar magnetic body separate from the first and second ferrite cores surrounding the annular wire ring is inserted and arranged in the center hole of the annular wire ring. The magnetic characteristics of the columnar magnetic body can be appropriately set according to the application. For example, in a case where a direct current is superimposed on the annular wire, magnetic saturation can be prevented by using a magnetic material having a high saturation magnetic flux density (for example, sendust) as the columnar magnetic body. In addition, the columnar magnetic body and the first
Further, since a minute air gap (magnetic gap) is generated between the second ferrite core and the second ferrite core, this minute air gap can also contribute to prevention of magnetic saturation.

【0014】さらに、インダクタンスが必要であれば、
柱状磁性体として透磁率の大きな(第2のフェライトコ
アよりも高い透磁率の)磁性材料を選定すればよい。
Further, if inductance is required,
A magnetic material having a high magnetic permeability (higher magnetic permeability than the second ferrite core) may be selected as the columnar magnetic body.

【0015】また、第1及び第2のフェライトコアから
なる外殻コア構造体は、ギャップを設けなくとも柱状磁
性体の磁気特性を適切に選ぶことで磁気飽和を防止で
き、リーケージインダクタンスが少なく、環状線輪をほ
ぼ完全に囲む磁気シールド構造の変成器(トランス)、
インダクタ等を得ることができる。
Further, in the outer shell core structure composed of the first and second ferrite cores, magnetic saturation can be prevented by appropriately selecting the magnetic characteristics of the columnar magnetic body without providing a gap, and the leakage inductance is small. A transformer with a magnetic shield structure that almost completely surrounds the annular wire ring,
An inductor or the like can be obtained.

【0016】前記環状線輪の線材として表面に絶縁処理
した金属箔を用いる場合、通常の丸断面のワイヤーに比
べて導体の占積率を上げることができ、電流容量の増大
及び発熱の低減を図ることができる。
When a metal foil whose surface is insulated is used as the wire material of the annular coil, the space factor of the conductor can be increased as compared with a wire having an ordinary round cross section, and the current capacity and heat generation can be reduced. Can be planned.

【0017】また、前記外殻コア構造体内の前記線輪収
納凹部に前記環状線輪を複数個配置した場合、変成器
(トランス)、コモンモードチョークコイル等を構成で
き、各線輪間の合わせ面に生ずる分布容量がLCの分布
定数回路を形成し、ノイズを除去する効果が大きくなる
利点を生む。さらに複数の環状線輪を直列接続すること
でインダクタンスの増大を図ることができ、逆に複数の
環状線輪を並列接続することで電流容量の増大と同時に
渦電流損の軽減により高周波のコイルに対応できる。
Further, when a plurality of the annular wire rings are arranged in the wire ring accommodating recess in the outer shell core structure, a transformer (common transformer), a common mode choke coil, etc. can be constructed, and a mating surface between the wire rings is formed. The generated distributed capacitance forms an LC distributed constant circuit, which has the advantage of increasing the effect of removing noise. Furthermore, the inductance can be increased by connecting a plurality of ring-shaped loops in series, and conversely, by connecting a plurality of ring-shaped loops in parallel, the current capacity can be increased and the eddy current loss can be reduced, resulting in a high-frequency coil. Can handle.

【0018】前記第1のフェライトコアを高抵抗フェラ
イトとし、当該第1のフェライトの突き合わせ面にリー
ド部導出用溝部を形成し、該リード部導出用溝部の底面
に前記電極の延長部分を形成するとともに、該延長部分
に前記環状線輪のリード部を溶着する構成とした場合、
リード部の引き出しを確実に実行でき、さらに電極とリ
ード部との接続をはんだ付け等で確実に実行できる。ま
た、リード部の厚さによって第1及び第2のフェライト
コア間にギャップが発生するのを防止できる。
The first ferrite core is made of high-resistance ferrite, a lead portion lead-out groove portion is formed on an abutting surface of the first ferrite core, and an extension portion of the electrode is formed on a bottom surface of the lead portion lead-out groove portion. In addition, when the lead portion of the annular wire is welded to the extended portion,
The lead portion can be reliably pulled out, and furthermore, the connection between the electrode and the lead portion can be reliably performed by soldering or the like. Further, it is possible to prevent a gap from being generated between the first and second ferrite cores due to the thickness of the lead portion.

【0019】[0019]

【実施例】以下、本発明に係る表面実装用インダクタの
実施例を図面に従って説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a surface mounting inductor according to the present invention will be described below with reference to the drawings.

【0020】図1乃至図6で本発明の第1実施例を説明
する。これらの図において、1は外殻コア構造体、2は
円環状線輪、及び3は円柱状磁性体である。
A first embodiment of the present invention will be described with reference to FIGS. In these figures, 1 is an outer shell core structure, 2 is an annular wire ring, and 3 is a columnar magnetic body.

【0021】外殻コア構造体1は、外形が方形板状で線
輪収納凹部11を突き合わせ面12に形成したNi−Z
n系高抵抗フェライト(絶縁性フェライト)の第1のフ
ェライトコア10と、同様に方形板状で線輪収納凹部2
1を突き合わせ面22に形成した同材質の第2のフェラ
イトコア20とを線輪収納凹部11,21を対面させて
突き合わせて接着一体化するものである。前記線輪収納
凹部11,21は深さの少ない円柱状凹部である。前記
第1のフェライトコア10の突き合わせ面12には、図
1及び図5に示すように、線輪収納凹部11から側面に
至るリード部導出用溝部13が複数間隔をあけて形成さ
れている。第1のフェライトコア10の両方の側面には
面装着端子としての電極14が複数(リード部導出用溝
部13と同数)形成され、図3に示すように、各電極1
4は第1のフェライトコア10の底面の一部及びリード
部導出用溝部13の底面に延長している。それらの電極
14は、例えば銀ペーストを印刷し、焼き付け、その後
はんだ鍍金することで第1のフェライトコア10上に直
接形成されている。
The outer shell core structure 1 has a rectangular plate-like outer shape, and has a recess 11 for accommodating the wire ring formed on the abutting surface 12 of Ni-Z.
Similarly to the first ferrite core 10 of n-type high resistance ferrite (insulating ferrite), it has a rectangular plate shape and the recess 2 for accommodating the wire ring.
1 and the second ferrite core 20 of the same material formed on the abutting surface 22 are made to face each other with the coil housing accommodating recesses 11 and 21 and abutted to be integrated. The wire ring receiving recesses 11 and 21 are cylindrical recesses having a small depth. As shown in FIGS. 1 and 5, on the abutting surface 12 of the first ferrite core 10, lead lead-out grooves 13 extending from the coil housing recess 11 to the side surface are formed at a plurality of intervals. A plurality of electrodes 14 as surface-mounting terminals (the same number as the lead portion leading groove portion 13) are formed on both side surfaces of the first ferrite core 10, and each electrode 1 is formed as shown in FIG.
Reference numeral 4 extends to a part of the bottom surface of the first ferrite core 10 and the bottom surface of the lead portion lead-out groove portion 13. The electrodes 14 are directly formed on the first ferrite core 10 by printing, for example, a silver paste, baking, and then solder plating.

【0022】前記円環状線輪2は、線材として絶縁被覆
を施した帯状銅箔30を用いたもので、その絶縁被覆の
表面にはさらに接着性樹脂がコーティングされている。
そして、円環状線輪2は帯状銅箔30の幅広面が内外周
面となるように当該帯状銅箔30をロール状に巻回し、
帯状銅箔30の絶縁被覆表面の接着性樹脂のコーティン
グを融着せしめて円環形状に固定することにより得られ
る。その円環状線輪2からは巻始めのリード部31及び
巻終わりのリード部32が引き出されている。それらの
リード部31,32は、その幅広面がリード部導出用溝
部13の底面に平行となるように折り曲げられて引き出
される。なお、外殻コア構造体1内の線輪収納凹部1
1,12に円環状線輪2を1個設ける場合は、帯状銅箔
30の幅は線輪収納凹部11,12の深さの和よりも僅
かに狭い寸法に設定すればよい。
The annular wire ring 2 uses a strip-shaped copper foil 30 having an insulating coating as a wire material, and the surface of the insulating coating is further coated with an adhesive resin.
The annular wire ring 2 is formed by winding the strip-shaped copper foil 30 into a roll so that the wide surface of the strip-shaped copper foil 30 becomes the inner and outer peripheral surfaces.
It is obtained by fusing a coating of an adhesive resin on the surface of the insulating coating of the strip-shaped copper foil 30 and fixing it in an annular shape. A lead portion 31 at the beginning of winding and a lead portion 32 at the end of winding are drawn out from the annular wire ring 2. The lead portions 31 and 32 are bent and drawn so that the wide surface thereof is parallel to the bottom surface of the lead portion lead-out groove portion 13. It should be noted that the wire ring housing recess 1 in the outer shell core structure 1
In the case where one annular wire ring 2 is provided in each of 1 and 12, the width of the strip-shaped copper foil 30 may be set to a size slightly narrower than the sum of the depths of the recesses 11 and 12 for housing the ring.

【0023】円柱状磁性体3は、例えばセンダスト等の
金属圧粉磁芯であり、円環状線輪2の中心穴33より僅
かに小径で前記線輪収納凹部11,12の深さの和に一
致する高さを有するものである。
The columnar magnetic body 3 is, for example, a metal dust core of sendust or the like, and has a diameter slightly smaller than the central hole 33 of the annular wire ring 2 and has the sum of the depths of the wire ring recesses 11 and 12. They have matching heights.

【0024】表面実装用インダクタの組立は、例えば第
1のフェライトコア10の線輪収納凹部11に、図6の
ように、帯状銅箔30をロール状に巻回し円環形状に予
め固定した円環状線輪2を配置し、そのリード部31,
32をリード部導出用溝部13の底面に延長した電極1
4にそれぞれ溶着する(はんだ付けする)。その後、、
円環状線輪2の中心穴33に前記円柱状磁性体3を挿
入、配置する。そして、第1のフェライトコア10上に
第2のフェライトコア20を突き合わせ、接着剤を併用
して相互に固着一体化して外殻コア構造体1を構成する
ことで、図2乃至図4に示すような完成した表面実装用
インダクタが得られる。
The assembly of the surface mount inductor is carried out, for example, by winding the strip-shaped copper foil 30 in a roll shape and preliminarily fixing it in an annular shape in the coil housing recess 11 of the first ferrite core 10 as shown in FIG. The annular wire ring 2 is arranged and its lead portion 31,
Electrode 1 in which 32 is extended to the bottom of the lead-out groove 13
Weld to 4 (solder) respectively. afterwards,,
The cylindrical magnetic body 3 is inserted and arranged in the center hole 33 of the annular wire ring 2. Then, the second ferrite core 20 is abutted on the first ferrite core 10, and the outer shell core structure 1 is configured by fixing and integrating the second ferrite core 20 with each other by using an adhesive as shown in FIGS. 2 to 4. Such a completed surface mount inductor is obtained.

【0025】図7は表面実装用インダクタの円環状線輪
2に流す直流電流とインダクタンスとの関係を示し、曲
線Pは本発明の第1実施例において円柱状磁性体3の両
端面と第1及び第2のフェライトコア10,20とのす
り合わせを良好にしてエアーギャップを極めて微小にし
た場合(例えば円柱状磁性体3の両端面を研磨した場
合)、曲線Qは本発明の第1実施例において円柱状磁性
体3の両端面と第1及び第2のフェライトコア10,2
0とのすり合わせを悪くしてエアーギャップを多少大き
くした場合(例えば円柱状磁性体3の両端面を研磨しな
い場合)、曲線Rは円柱部分を一体に形成した一般のフ
ェライトポット型コアを用いた場合である。但し、円環
状線輪2の帯状銅箔30は厚み0.06mm、幅1.2mm
で、巻数10回であり、円柱状磁性体3の材質はセンダ
ストで比透磁率は57である。また、第1及び第2のフ
ェライトコア10,20は比透磁率が600で、縦5m
m、横5mm、高さ1mmの方形板状の外形を持つものであ
る。この図7から、一般のフェライトポット型コアを用
いた場合には、直流電流が0.7A程度で磁気飽和に起
因してインダクタンスが急減するが、円柱状磁性体3と
して飽和磁束密度が高いセンダストを用いた曲線P,Q
のときは直流電流の増加に伴うインダクタンスの低下は
緩やかである。なお、円柱状磁性体3の両端面と第1及
び第2のフェライトコア10,20とのすり合わせを悪
くしてエアーギャップを多少大きくした曲線Qの場合、
微小エアーギャップの存在により直流電流の多い領域で
のインダクタンスの低下をより一層少なくできる。
FIG. 7 shows the relationship between the direct current flowing through the annular wire ring 2 of the surface-mounting inductor and the inductance. The curve P indicates the first and second end surfaces of the cylindrical magnetic body 3 in the first embodiment of the present invention. In the case where the air gap is made extremely small by finely matching with the second ferrite cores 10 and 20 (for example, both end faces of the cylindrical magnetic body 3 are polished), the curve Q is the first embodiment of the present invention. At both end surfaces of the cylindrical magnetic body 3 and the first and second ferrite cores 10, 2
In the case where the air gap is made slightly larger by making a bad match with 0 (for example, when both end faces of the cylindrical magnetic body 3 are not polished), the curve R uses a general ferrite pot type core integrally formed with a cylindrical portion. This is the case. However, the band-shaped copper foil 30 of the annular wire ring 2 has a thickness of 0.06 mm and a width of 1.2 mm.
The number of turns is 10, and the cylindrical magnetic body 3 is made of sendust and has a relative magnetic permeability of 57. The first and second ferrite cores 10 and 20 have a relative magnetic permeability of 600 and a length of 5 m.
It has a square plate-like outer shape with m, width 5 mm, and height 1 mm. From FIG. 7, when a general ferrite pot type core is used, the inductance decreases sharply due to magnetic saturation when the direct current is about 0.7 A, but as the cylindrical magnetic body 3, the sendust having a high saturation magnetic flux density is obtained. Curves P and Q using
At this time, the decrease in inductance with the increase in DC current is gradual. Incidentally, in the case of the curve Q in which the air gaps are slightly increased by making the both end surfaces of the cylindrical magnetic body 3 and the first and second ferrite cores 10 and 20 poorly fitted to each other,
The presence of the minute air gap can further reduce the decrease in inductance in the region where the direct current is high.

【0026】この第1実施例によれば、次の通りの効果
を得ることができる。
According to the first embodiment, the following effects can be obtained.

【0027】(1) 円環状線輪2を囲む第1及び第2の
フェライトコア10,20とは別体の円柱状磁性体3を
円環状線輪2の中心穴33に挿入、配置しており、用途
に応じて円柱状磁性体3の磁気特性を適切に設定するこ
とができる。例えば、円環状線輪2に直流電流を重畳す
る用途では、円柱状磁性体として飽和磁束密度の大きい
磁性材料(例えば、センダスト等)を使用することで磁
気飽和を防止することができる。また、円柱状磁性体3
と第1及び第2のフェライトコア10,20との間に微
小エアーギャップ(磁気ギャップ)が発生するため、こ
の微小エアーギャップも磁気飽和防止に寄与できる。
(1) Inserting and arranging the cylindrical magnetic body 3 which is separate from the first and second ferrite cores 10 and 20 surrounding the annular wire ring 2 into the center hole 33 of the annular wire ring 2. Therefore, the magnetic characteristics of the cylindrical magnetic body 3 can be appropriately set according to the application. For example, in a case where a direct current is superimposed on the annular wire ring 2, magnetic saturation can be prevented by using a magnetic material having a high saturation magnetic flux density (for example, sendust) as a columnar magnetic body. In addition, the cylindrical magnetic body 3
Since a minute air gap (magnetic gap) is generated between the first and second ferrite cores 10 and 20, this minute air gap can also contribute to prevention of magnetic saturation.

【0028】(2) 第1及び第2のフェライトコア1
0,20からなる外殻コア構造体1は、ギャップを設け
なくとも円柱状磁性体3の磁気特性を適切に選ぶことで
磁気飽和を防止でき、リーケージインダクタンスが少な
く、円環状線輪2をほぼ完全に囲む磁気シールド構造の
インダクタを得ることができる。すなわち、外殻コア構
造体1は磁気シールドケースとしての機能を果たすこと
ができる。
(2) First and second ferrite cores 1
The outer shell core structure 1 composed of 0 and 20 can prevent magnetic saturation by appropriately selecting the magnetic characteristics of the columnar magnetic body 3 without providing a gap, has a low leakage inductance, and has almost no annular ring 2. It is possible to obtain an inductor having a magnetic shield structure that completely surrounds the inductor. That is, the outer shell core structure 1 can function as a magnetic shield case.

【0029】(3) 円環状線輪2の線材として表面に絶
縁処理した帯状銅箔30を用いており、導体の占積率を
上げることができ、電流容量の増大及び発熱の低減を図
ることができる。また、帯状銅箔30の絶縁被覆に接着
性樹脂コーティングを施しておくことにより、帯状銅箔
30をロール状に巻回してから接着性樹脂で円環形状に
固定できる。この結果、ボビンレス構造として外殻コア
構造体1内の線輪収納凹部11,21の空間を有効利用
でき、インダクタンスの増加を図り得る。
(3) Since the strip-shaped copper foil 30 whose surface is insulated is used as the wire material of the annular wire ring 2, the space factor of the conductor can be increased, and the current capacity and the heat generation can be reduced. You can Further, by applying an adhesive resin coating to the insulating coating of the strip-shaped copper foil 30, the strip-shaped copper foil 30 can be wound in a roll shape and then fixed in an annular shape with the adhesive resin. As a result, as the bobbin-less structure, the space of the coil housing recesses 11 and 21 in the outer shell core structure 1 can be effectively used, and the inductance can be increased.

【0030】(4) 前記第1のフェライトコア10を高
抵抗フェライトとし、当該第1のフェライト10の突き
合わせ面12にリード部導出用溝部13を形成し、該リ
ード部導出用溝部13の底面に電極14の延長部分を形
成するとともに、該延長部分に前記円環状線輪2のリー
ド部31,32を溶着する構成としており、リード部3
1,32の引き出しを確実に実行でき、さらに電極14
とリード部31,32との接続をはんだ付け等で確実に
実行できる(例えば、リード部31,32がウレタン被
覆銅箔で電極14がはんだ層を持つものであれば、リー
ド部31,32を加熱圧着することではんだ溶着でき
る。)。また、リード部31,32の厚さによって第1
及び第2のフェライトコア10,20間にギャップが発
生するのを防止できる。なお、電極14は高抵抗フェラ
イトの第1のフェライトコア10に銀ペースト等の印
刷、焼き付け等で直接形成できるから、端子板等は不要
であり、部品点数の削減や小型化にも有効である。
(4) The first ferrite core 10 is made of high-resistance ferrite, the lead portion lead-out groove portion 13 is formed on the abutting surface 12 of the first ferrite 10, and the bottom portion of the lead portion lead-out groove portion 13 is formed. The extended portion of the electrode 14 is formed, and the lead portions 31 and 32 of the annular wire ring 2 are welded to the extended portion.
1 and 32 can be reliably pulled out, and the electrode 14
Can be reliably performed by soldering or the like (for example, if the lead portions 31, 32 are urethane coated copper foil and the electrode 14 has a solder layer, the lead portions 31, 32 are Soldering can be done by heating and pressure bonding.). Also, depending on the thickness of the lead portions 31 and 32, the first
Also, it is possible to prevent a gap from being generated between the second ferrite cores 10 and 20. Since the electrode 14 can be directly formed on the first ferrite core 10 of high-resistance ferrite by printing or baking silver paste or the like, a terminal plate or the like is not necessary, and it is also effective for reducing the number of parts and downsizing. .

【0031】図8は本発明の第2実施例を示す。この場
合、第1のフェライトコア10と第2のフェライトコア
20とを突き合わせ接着一体化してなる外殻コア構造体
1の内部の線輪収納凹部11,21には複数の(2個
の)円環状線輪2A,2Bが配置されている。そして各
円環状線輪2A,2Bから引き出されたリード部は所定
のリード部導出用溝部13底部に位置した電極14の延
長部分にはんだ付け等で接続される。なお、円環状線輪
2A,2Bも第1実施例に示した円環状線輪2と同様に
絶縁被覆した帯状銅箔をロール状に巻回して接着性樹脂
で円環形状にそれぞれ固着したものであり、円環状線輪
2A,2Bの帯状銅箔の各幅の総和が外殻コア構造体1
内の線輪収納凹部11,21の深さの和よりも僅かに狭
くなるように設定されている。
FIG. 8 shows a second embodiment of the present invention. In this case, a plurality of (two) circles are provided in the coil housing recesses 11 and 21 inside the outer shell core structure 1 formed by butt-bonding and integrating the first ferrite core 10 and the second ferrite core 20. Annular line wheels 2A and 2B are arranged. Then, the lead portions drawn out from the respective annular wire rings 2A and 2B are connected to the extended portion of the electrode 14 located at the bottom of the predetermined lead portion lead-out groove portion 13 by soldering or the like. The ring-shaped coils 2A and 2B are wound in the same manner as in the ring-shaped coil 2 shown in the first embodiment, but are wound in a roll shape and fixed in an annular shape with an adhesive resin. And the sum of the widths of the strip-shaped copper foils of the annular wire rings 2A and 2B is the outer shell core structure 1
It is set to be slightly narrower than the sum of the depths of the inner ring wheel storage recesses 11 and 21.

【0032】その他の構成は前述した第1実施例と同様
であり、同一又は相当部分に同一符号を付して説明を省
略する。
The other structure is the same as that of the first embodiment described above, and the same or corresponding parts are designated by the same reference numerals and the description thereof will be omitted.

【0033】この第2実施例では、外殻コア構造体1内
の前記線輪収納凹部11,21に複数の円環状線輪2
A,2Bを配置しており、変成器(トランス)、コモン
モードチョークコイル等を構成できる。この場合、線輪
2A,2Bの合わせ面に生ずる分布容量がLCの分布定
数回路を形成し、ノイズを除去する効果が大きくなる利
点を生む。さらに複数の円環状線輪2A,2Bを直列接
続することでインダクタンスの増大を図ることができ、
逆に複数の円環状線輪2A,2Bを並列接続することで
電流容量の増大と同時に渦電流損の軽減により高周波の
コイルに対応できる。
In the second embodiment, a plurality of annular wire rings 2 are provided in the wire ring housing recesses 11 and 21 in the outer shell core structure 1.
By disposing A and 2B, a transformer (common transformer), a common mode choke coil, etc. can be configured. In this case, the distributed capacitance generated on the mating surfaces of the wire rings 2A and 2B forms an LC distributed constant circuit, and the effect of removing noise is increased. Further, by connecting a plurality of annular wire rings 2A and 2B in series, the inductance can be increased,
On the contrary, by connecting a plurality of annular coils 2A and 2B in parallel, it is possible to cope with a high frequency coil by increasing the current capacity and reducing the eddy current loss.

【0034】なお、上記実施例では、円柱状磁性体3と
してセンダストを選定した場合を例示したが、高いイン
ダクタンスが必要であれば、円柱状磁性体として透磁率
の大きな(外殻コア構造体1をなす第1及び第2のフェ
ライトコア10,20よりも高い透磁率の)磁性材料を
選定すればよい。
In the above embodiment, the case where sendust is selected as the cylindrical magnetic body 3 is illustrated, but if high inductance is required, the cylindrical magnetic body has a large magnetic permeability (outer shell core structure 1). A magnetic material having a higher magnetic permeability than the first and second ferrite cores 10 and 20 that form

【0035】また、環状線輪の巻始めと巻終わりとから
リード部を引き出したが、中間部からもリード部を引き
出す場合がある。
Although the lead portion is pulled out from the winding start and winding end of the annular wire, the lead portion may also be pulled out from the intermediate portion.

【0036】以上本発明の実施例について説明してきた
が、本発明はこれに限定されることなく請求項の記載の
範囲内において各種の変形、変更が可能なことは当業者
には自明であろう。
Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to this and various modifications and changes can be made within the scope of the claims. Let's do it.

【0037】[0037]

【発明の効果】以上説明したように、本発明の表面実装
用インダクタによれば、環状線輪を囲む第1及び第2の
フェライトコアとは別体の柱状磁性体を前記環状線輪の
中心穴に挿入、配置しており、柱状磁性体の磁気特性を
適切に設定することで、多様な用途に対応させることが
できる。例えば、環状線輪に直流電流を重畳する用途で
は、柱状磁性体として飽和磁束密度の大きい磁性材料
(例えば、センダスト等の金属圧粉磁芯)を使用するこ
とで磁気飽和を防止することができる。また、柱状磁性
体と第1及び第2のフェライトコアとの間に微小エアー
ギャップ(磁気ギャップ)が発生するため、この微小エ
アーギャップも磁気飽和防止に寄与できる。インダクタ
ンスが必要であれば、柱状磁性体として透磁率の大きな
(第1及び第2のフェライトコアよりも高い透磁率の)
磁性材料を選定すればよい。
As described above, according to the surface mounting inductor of the present invention, the columnar magnetic body separate from the first and second ferrite cores surrounding the annular wire ring is provided at the center of the annular wire ring. It is inserted and arranged in the hole, and by appropriately setting the magnetic characteristics of the columnar magnetic body, it is possible to meet various uses. For example, in a case where a direct current is superimposed on the annular wire, magnetic saturation can be prevented by using a magnetic material having a high saturation magnetic flux density (for example, a metal dust core such as sendust) as the columnar magnetic body. . Further, since a minute air gap (magnetic gap) is generated between the columnar magnetic body and the first and second ferrite cores, this minute air gap can also contribute to preventing magnetic saturation. If inductance is required, the columnar magnetic material has a high magnetic permeability (higher magnetic permeability than the first and second ferrite cores).
A magnetic material may be selected.

【0038】また、第1及び第2のフェライトコアから
なる外殻コア構造体は、ギャップを設けなくとも柱状磁
性体の磁気特性を適切に選ぶことで磁気飽和を防止でき
るから、小型、薄型でリーケージインダクタンスが少な
く、環状線輪をほぼ完全に囲む磁気シールド構造の変成
器(トランス)、インダクタ等を実現することができ
る。
Further, the outer shell core structure composed of the first and second ferrite cores can be prevented from magnetic saturation by properly selecting the magnetic characteristics of the columnar magnetic body without providing a gap, so that it is small and thin. It is possible to realize a transformer, an inductor and the like having a magnetic shield structure that has little leakage inductance and that almost completely surrounds the annular wire ring.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に係る表面実装用インダクタの第1実施
例を示す分解斜視図である。
FIG. 1 is an exploded perspective view showing a first embodiment of a surface mounting inductor according to the present invention.

【図2】同斜視図である。FIG. 2 is a perspective view of the same.

【図3】同正断面図である。FIG. 3 is a front sectional view of the same.

【図4】同側面図である。FIG. 4 is a side view of the same.

【図5】第1のフェライトコアの平面図である。FIG. 5 is a plan view of a first ferrite core.

【図6】第1のフェライトコアの線輪収納凹部に円環状
線輪を挿置した状態を示す平面図である。
FIG. 6 is a plan view showing a state in which an annular wire ring is inserted into a wire ring housing recess of a first ferrite core.

【図7】本発明の第1実施例の環状線輪に流す直流電流
とインダクタンスとの関係を示すグラフである。
FIG. 7 is a graph showing the relationship between the direct current flowing through the annular wire and the inductance of the first embodiment of the present invention.

【図8】本発明の第2実施例を示す正断面図である。FIG. 8 is a front sectional view showing a second embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 外殻コア構造体 2,2A,2B 円環状線輪 3 円柱状磁性体 10 第1のフェライトコア 11,21 線輪収納凹部 12,22 突き合わせ面 13 リード部導出用溝部 14 電極 30 帯状銅箔 31,32 リード部 33 中心穴 1 Outer Shell Core Structure 2, 2A, 2B Annular Wire Ring 3 Cylindrical Magnetic Material 10 First Ferrite Core 11, 21 Wire Wheel Recessed Recess 12, 22 Butt Face 13 Lead Lead Out Groove 14 Electrode 30 Strip Copper Foil 31, 32 Lead part 33 Center hole

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 線輪収納凹部が形成されるとともに少な
くとも側面に電極が形成されている第1のフェライトコ
アと、前記線輪収納凹部を塞ぐ如く前記第1のフェライ
トコアに接着される第2のフェライトコアとからなる外
殻コア構造体と、 巻回された線材が接着性物質で環状形状に固定され、少
なくとも巻始めと巻終わりにリード部を持っていて前記
外殻コア構造体内の線輪収納凹部に配置される環状線輪
と、 前記第1及び第2フェライトコアとは別体であって前記
環状線輪の中心穴に挿置される柱状磁性体とを備え、 前記リード部が前記電極にそれぞれ接続されていること
を特徴とする表面実装用インダクタ。
1. A first ferrite core having a recess for accommodating a wire wheel and at least an electrode formed on a side surface thereof, and a second ferrite core bonded to the first ferrite core so as to close the recess for accommodating the wire wheel. The outer core structure consisting of the ferrite core and the wound wire is fixed in an annular shape by an adhesive substance, and the lead wire is provided at least at the beginning and end of the winding, and the wire inside the outer core structure is An annular wire wheel disposed in the wheel housing recess; and a columnar magnetic body that is separate from the first and second ferrite cores and is inserted into the center hole of the annular wire wheel, wherein the lead portion is A surface mounting inductor, which is connected to each of the electrodes.
【請求項2】 前記線材が表面を絶縁処理した金属箔で
ある請求項1記載の表面実装用インダクタ。
2. The surface mounting inductor according to claim 1, wherein the wire is a metal foil whose surface is insulation-treated.
【請求項3】 前記外殻コア構造体内の前記線輪収納凹
部に前記環状線輪が複数個配置されている請求項1又は
2記載の表面実装用インダクタ。
3. The surface-mounting inductor according to claim 1, wherein a plurality of the annular wire rings are arranged in the wire ring housing recess in the outer shell core structure.
【請求項4】 前記第1のフェライトコアが高抵抗フェ
ライトであり、当該第1のフェライトコアの突き合わせ
面にリード部導出用溝部が形成され、該リード部導出用
溝部の底面に前記電極の延長部分が形成されており、該
延長部分にて前記リード部が溶着されている請求項1,
2又は3記載の表面実装用インダクタ。
4. The first ferrite core is a high resistance ferrite, a lead part lead-out groove is formed on an abutting surface of the first ferrite core, and the electrode is extended on a bottom surface of the lead part lead-out groove. A portion is formed, and the lead portion is welded at the extension portion.
2. The surface mount inductor according to 2 or 3.
JP10168794A 1994-04-18 1994-04-18 Surface mount inductor Granted JPH07288210A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10168794A JPH07288210A (en) 1994-04-18 1994-04-18 Surface mount inductor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10168794A JPH07288210A (en) 1994-04-18 1994-04-18 Surface mount inductor

Publications (1)

Publication Number Publication Date
JPH07288210A true JPH07288210A (en) 1995-10-31

Family

ID=14307255

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10168794A Granted JPH07288210A (en) 1994-04-18 1994-04-18 Surface mount inductor

Country Status (1)

Country Link
JP (1) JPH07288210A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US6504463B1 (en) 1999-03-12 2003-01-07 Murata Manufacturing Co., Ltd. Coil and surface-mounting-type coil component
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EP1473744A2 (en) * 1999-10-28 2004-11-03 Coilcraft, Inc. Low profile inductive component
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USRE39453E1 (en) 1999-10-28 2007-01-02 Coilcraft, Incorporated Low profile inductive component
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JP2007234885A (en) * 2006-03-01 2007-09-13 Sumida Corporation Transformer
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US8614617B2 (en) 2009-07-16 2013-12-24 Kobe Steel, Ltd. Reactor
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CN108292556A (en) * 2015-12-22 2018-07-17 伊顿智能动力有限公司 Modularization integrates the non-coupled winding power inductor of multiphase and manufacturing method
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