JPH08335517A - Lamination common mode choke coil - Google Patents
Lamination common mode choke coilInfo
- Publication number
- JPH08335517A JPH08335517A JP7679396A JP7679396A JPH08335517A JP H08335517 A JPH08335517 A JP H08335517A JP 7679396 A JP7679396 A JP 7679396A JP 7679396 A JP7679396 A JP 7679396A JP H08335517 A JPH08335517 A JP H08335517A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- coil
- common mode
- electrodes
- mode choke
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、積層コモンモード
チョークコイルに関し、特に、ノーマルモードのインピ
ーダンスの絶対値を低下させた積層コモンモードチョー
クコイルの構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated common mode choke coil, and more particularly to a laminated common mode choke coil structure in which the absolute value of normal mode impedance is reduced.
【０００２】[0002]
【従来の技術】従来、コモンモードチョークコイルの一
種として、コイル形状を有する金属薄膜パターンを磁性
体基板で挟持した構造を有する積層コモンモードチョー
クコイルがある。このような積層コモンモードチョーク
コイルの二つの例が、例えば特開平４−３６４７０９号
公報に示されている。当該公報に開示された積層コモン
モードチョークコイルは、フォトリソグラフィなどの薄
膜プロセスを用い、１次コイル及び２次コイル導体を絶
縁層を介して厚み方向に複数層重ね合わせて形成されて
いる。このような積層構造において、絶縁層は薄膜プロ
セスを用いて形成されるため、その膜厚を薄くすること
ができる。このため、絶縁層を介して対向する１次コイ
ル導体及び２次コイル導体の距離を短くすることがで
き、これによって結合係数を高め、コモンモードノイズ
に対して高いインピーダンスを有するように構成されて
いる。この結果、優れたコモンモードノイズ除去性能を
発揮する積層コモンモードチョークコイルを得ている。2. Description of the Related Art Conventionally, as one type of common mode choke coil, there is a laminated common mode choke coil having a structure in which a metal thin film pattern having a coil shape is sandwiched between magnetic substrates. Two examples of such a laminated common mode choke coil are disclosed in, for example, Japanese Patent Application Laid-Open No. 4-364709. The laminated common mode choke coil disclosed in this publication is formed by laminating a plurality of primary coil and secondary coil conductors in the thickness direction with an insulating layer interposed therebetween by using a thin film process such as photolithography. In such a laminated structure, the insulating layer is formed using a thin film process, so that the film thickness can be reduced. Therefore, the distance between the primary coil conductor and the secondary coil conductor facing each other via the insulating layer can be shortened, thereby increasing the coupling coefficient and having a high impedance with respect to common mode noise. There is. As a result, a laminated common mode choke coil that exhibits excellent common mode noise elimination performance is obtained.
【０００３】ところが、例えば当該公報の図５に示され
るような積層コモンモードチョークコイルは、ノーマル
モード信号に対し、その波形を変えてしまうという問題
があった。この原因としては、１次コイルと２次コイル
のターン数（巻数）に差があり、このために両コイル間
の磁気的バランスが崩れることが影響していた。However, the laminated common mode choke coil as shown in FIG. 5 of the publication, for example, has a problem that its waveform is changed with respect to a normal mode signal. The cause of this is that there is a difference in the number of turns (number of turns) between the primary coil and the secondary coil, which causes the magnetic balance between both coils to be disturbed.
【０００４】このため、当該公報の図１に開示された積
層コモンモードチョークコイルでは、１次コイルと２次
コイルとの巻数が等しくなるようにコイル形状を調整し
ている。このような積層コモンモードチョークコイルの
外観形状を図５に示す。図示の積層コモンモードチョー
クコイル５０は、１次コイル及び２次コイルの巻数を等
しくさせた結果、１次コイルの入出力用の外部電極５
１，５２と、２次コイルの入出力用の外部電極５３，５
４とが互いにチップの対角線上に配置されている。この
ような外部電極の配置構造では、この積層コモンモード
チョークコイルを実装して使用する場合、１次コイルに
接続すべき配線と２次コイルに接続すべき配線とを互い
に対角線上の位置にまで引き回す必要があるため、実装
上、配線パターンが複雑化するという問題がある。For this reason, in the laminated common mode choke coil disclosed in FIG. 1 of the publication, the coil shape is adjusted so that the primary coil and the secondary coil have the same number of turns. The external shape of such a laminated common mode choke coil is shown in FIG. The laminated common mode choke coil 50 shown in the figure has the same number of turns of the primary coil and the secondary coil, and as a result, the external electrode 5 for input / output of the primary coil is provided.
1, 52 and external electrodes 53, 5 for input / output of the secondary coil
4 and 4 are arranged on the diagonal of the chip with respect to each other. In such an external electrode arrangement structure, when the laminated common mode choke coil is mounted and used, the wiring to be connected to the primary coil and the wiring to be connected to the secondary coil are even diagonally located to each other. Since it needs to be routed, there is a problem in that the wiring pattern becomes complicated in terms of mounting.
【０００５】そこで、上記１次／２次コイルの巻数を同
等にし、かつ１次コイル側及び２次コイル側の各々の外
部電極をチップの同じ側に整列させた積層コモンモード
チョークコイルが考案された。図６は、このような構造
を有する従来の積層コモンモードチョークコイルの分解
斜視図であり、図７は、１次コイル及び２次コイルのパ
ターン形状を示す平面構造図であり、図８は、図６中の
切断線Ｙ−Ｙに沿う方向からの断面構造図である。Therefore, a laminated common mode choke coil is devised in which the number of turns of the primary / secondary coil is made equal and the external electrodes on the primary coil side and the secondary coil side are aligned on the same side of the chip. It was FIG. 6 is an exploded perspective view of a conventional laminated common mode choke coil having such a structure, FIG. 7 is a plan view showing a pattern shape of a primary coil and a secondary coil, and FIG. FIG. 7 is a cross-sectional structural view from a direction along a cutting line YY in FIG. 6.
【０００６】図６〜図８を参照して、積層コモンモード
チョークコイル１０は、一対の磁性体基板１１，１７の
間に複数の絶縁層１３Ａ，１３，１５を積層して構成さ
れている。絶縁層１３Ａと絶縁層１３との間には、金属
薄膜からなる１次コイル電極１２ａが形成されている。
１次コイル電極１２ａの一端は外部電極３ａに接続さ
れ、他端は第１スルーホール電極２３ａ，２５ａとの接
続点２２ａに接続されている。With reference to FIGS. 6 to 8, the laminated common mode choke coil 10 is constructed by laminating a plurality of insulating layers 13A, 13, 15 between a pair of magnetic substrate 11, 17. A primary coil electrode 12a made of a metal thin film is formed between the insulating layers 13A and 13.
One end of the primary coil electrode 12a is connected to the external electrode 3a, and the other end is connected to a connection point 22a with the first through hole electrodes 23a and 25a.
【０００７】また、２次コイル電極１４ｂは、２つの絶
縁層１３，１５の間に形成されている。２次コイル電極
１４ｂの一端は外部電極２ｂに接続され、他端は、第２
スルーホール電極２５ｂとの接続点２４ｂに接続されて
いる。The secondary coil electrode 14b is formed between the two insulating layers 13 and 15. One end of the secondary coil electrode 14b is connected to the external electrode 2b, and the other end is connected to the second electrode.
It is connected to a connection point 24b with the through hole electrode 25b.
【０００８】さらに、絶縁層１５と磁性体基板１７との
間には、１次コイル電極用の引き出し電極１６ａと、２
次コイル電極用の引き出し電極１６ｂが形成されてい
る。１次コイル電極用引き出し電極１６ａは、第１スル
ーホール電極２３ａ,２５ａとの接続点２６ａと外部電
極４ａとの間に接続されている。また、２次コイル電極
用引き出し電極１６ｂは第２スルーホール電極２５ｂと
の接続点２６ｂと外部電極５ｂとの間に接続されてい
る。Further, between the insulating layer 15 and the magnetic substrate 17, the lead electrode 16a for the primary coil electrode and the lead electrode 16a
A lead electrode 16b for the next coil electrode is formed. The lead electrode 16a for the primary coil electrode is connected between the connection point 26a with the first through hole electrodes 23a and 25a and the external electrode 4a. The secondary coil electrode lead electrode 16b is connected between the connection point 26b with the second through hole electrode 25b and the external electrode 5b.
【０００９】この積層コモンモードチョークコイル１０
では、１次コイル電極１２ａの巻数は約２Ｔ（ター
ン）、２次コイル電極１４ｂの巻数は２・１／８Ｔとほ
ぼ等しく設定されている。また、１次コイル電極用の外
部電極３ａ，４ａと２次コイル電極用の外部電極２ｂ，
５ｂとは、各々直方体状のチップの同一側面側に露出す
るように設けられている。This laminated common mode choke coil 10
Then, the number of turns of the primary coil electrode 12a is set to about 2T (turn), and the number of turns of the secondary coil electrode 14b is set to be approximately equal to 2⅛T. Also, the external electrodes 3a and 4a for the primary coil electrode and the external electrodes 2b and 2b for the secondary coil electrode,
5b is provided so as to be exposed on the same side surface side of each rectangular parallelepiped chip.
【００１０】[0010]
【発明が解決しようとする課題】上記のように、積層コ
モンモードチョークコイルにおいては、ノーマルモード
信号の波形変化を防止する観点からは、１次コイルと２
次コイルとの磁気的なバランスを保つことが重要であ
る。このため、図６〜図８に示す従来の積層コモンモー
ドチョークコイルでは、１次コイル電極と２次コイル電
極の巻数がほぼ等しくなるように工夫している。As described above, in the laminated common mode choke coil, from the viewpoint of preventing the waveform change of the normal mode signal, the primary coil and the secondary coil are used.
It is important to maintain magnetic balance with the next coil. Therefore, the conventional laminated common mode choke coil shown in FIGS. 6 to 8 is devised so that the number of turns of the primary coil electrode and the number of turns of the secondary coil electrode are substantially equal.
【００１１】しかしながら、図７に示すように、１次コ
イル電極と２次コイル電極との巻数を等しくするように
コイルパターンを設定した結果、スルーホール電極２３
ａ，２５ｂの近傍において、１次コイル電極１２ａと２
次コイル電極２４ｂとが互いに重なり合わない部分が構
成されている。この１次及び２次コイル電極１２ａ，１
４ｂが重なり合わない部分では、コイル間の磁気的結合
が弱くなり、ノーマルモード信号に対するインピーダン
スが高くなるという問題が生じた。However, as shown in FIG. 7, as a result of setting the coil pattern so that the primary coil electrode and the secondary coil electrode have the same number of turns, the through-hole electrode 23
a, 25b in the vicinity of the primary coil electrodes 12a and 2
A portion that does not overlap the next coil electrode 24b is configured. The primary and secondary coil electrodes 12a, 1
In the portion where 4b does not overlap, the magnetic coupling between the coils is weakened, causing a problem that the impedance for the normal mode signal is increased.
【００１２】本発明の目的は、一対のコイル電極間の磁
気的な結合性を向上させ、ノーマルモードにおけるイン
ピーダンスを低下させることができる積層コモンモード
チョークコイルを提供することである。An object of the present invention is to provide a laminated common mode choke coil capable of improving the magnetic coupling between a pair of coil electrodes and lowering the impedance in the normal mode.
【００１３】[0013]
【課題を解決するための手段】本発明による積層コモン
モードチョークコイルは、一対の磁性体基板の間に絶縁
層を挟持してなる積層体の厚み方向において互いに異な
る層に第１及び第２コイル電極を形成するとともに、積
層体の端部に第１〜第４外部電極を形成し、第１及び第
２コイル電極の一端が、各々第１及び第３外部電極に接
続され、他端が、各々第１及び第２スルーホール電極を
介して第２及び第４外部電極に接続された積層コモンモ
ードチョークコイルであり、第１コイル電極及び第２コ
イル電極は、スパイラル形状に形成されており、さら
に、第１コイル電極は、第１外部電極との接続部から延
び、最初に第２コイル電極と重複する位置から第２スル
ーホール電極に達する位置まで、第２コイル電極と重複
する形状に形成されていることを特徴としている。A laminated common mode choke coil according to the present invention has a first and a second coil in layers different from each other in a thickness direction of a laminated body in which an insulating layer is sandwiched between a pair of magnetic substrates. Along with forming the electrodes, first to fourth external electrodes are formed at the ends of the laminated body, one ends of the first and second coil electrodes are connected to the first and third external electrodes, respectively, and the other ends are A laminated common mode choke coil connected to the second and fourth external electrodes via the first and second through-hole electrodes, respectively, wherein the first coil electrode and the second coil electrode are formed in a spiral shape, Further, the first coil electrode extends from the connection portion with the first external electrode and is formed in a shape overlapping with the second coil electrode from a position where it first overlaps with the second coil electrode to a position where it reaches the second through-hole electrode. Done It is characterized in that there.
【００１４】本発明のより具体的な局面において、積層
コモンモードチョークコイルは、一対の第１及び第２磁
性体基板と、第１及び第２磁性体基板の間に積層された
第１及び第２絶縁層を有する直方体形状の積層体と、第
１磁性体基板と第１絶縁層の間に形成された第１コイル
電極及び第１コイル電極の一端に接続された第１外部電
極と、第２絶縁層と第２磁性体基板との間に形成され、
その一端が第１コイル電極の他端と電気的に接続された
第１引き出し電極、及び該第１引き出し電極の他端に接
続された第２外部電極と、第１絶縁層と第２絶縁層との
間に形成された第２コイル電極及び第２コイル電極の一
端に接続された第３外部電極と、第２絶縁層と第２磁性
体基板との間に形成され、その一端が第２コイル電極の
他端と電気的に接続された第２引き出し電極と、該第２
引き出し電極の他端に接続された第４外部電極と、第１
及び第２絶縁層の内部に形成され、第１コイル電極の他
端と第１引き出し電極の一端とを接続する第１スルーホ
ール電極と、第２絶縁層の内部に形成され、第２コイル
電極の他端と第２引き出し電極の一端とを接続する第２
スルーホール電極とを備えている。そして、第１及び第
２外部電極は、その一部が積層体の第１の側面に露出す
る位置に形成され、第３及び第４外部電極は、その一部
が積層体の第１の側面に対向する第２の側面に露出する
位置に形成されており、第１コイル電極は、第１外部電
極から第１スルーホール電極に向かってスパイラル形状
に形成されており、第２コイル電極は、第３外部電極か
ら第２スルーホール電極に向かってスパイラル形状に形
成されている。さらに、第１コイル電極のスパイラル形
状は、第１外部電極から延び、最初に第２コイル電極と
重複する位置から第２スルーホール電極に達する位置ま
で第２コイル電極と重複するように構成されていること
を特徴としている。In a more specific aspect of the present invention, a laminated common mode choke coil has a pair of first and second magnetic substance substrates, and first and second magnetic substance substrates laminated between the first and second magnetic substance substrates. A rectangular parallelepiped laminated body having two insulating layers, a first coil electrode formed between the first magnetic substrate and the first insulating layer, and a first external electrode connected to one end of the first coil electrode; Formed between the second insulating layer and the second magnetic substrate,
A first extraction electrode whose one end is electrically connected to the other end of the first coil electrode, a second external electrode connected to the other end of the first extraction electrode, a first insulating layer and a second insulating layer Formed between the second coil electrode and the third external electrode connected to one end of the second coil electrode, and the second insulating layer and the second magnetic substrate, and one end of which is the second A second extraction electrode electrically connected to the other end of the coil electrode;
A fourth external electrode connected to the other end of the extraction electrode, and a first external electrode
And a first through-hole electrode formed inside the second insulating layer and connecting the other end of the first coil electrode and one end of the first lead electrode, and a second coil electrode formed inside the second insulating layer. Connecting the other end of the second lead electrode with one end of the second lead electrode
And through-hole electrodes. And the 1st and 2nd external electrodes are formed in the position which a part exposes to the 1st side surface of a laminated body, and the 3rd and 4th external electrodes have a part of that 1st side surface of a laminated body. The first coil electrode is formed in a spiral shape from the first external electrode toward the first through-hole electrode, and the second coil electrode is The spiral shape is formed from the third external electrode toward the second through-hole electrode. Furthermore, the spiral shape of the first coil electrode is configured to extend from the first external electrode and overlap the second coil electrode from a position where it first overlaps with the second coil electrode to a position where it reaches the second through-hole electrode. It is characterized by being.
【００１５】また、本発明の限定された局面による積層
コモンモードチョークコイルでは、第１コイル電極が、
第２スルーホール電極上を通過した位置から第１スルー
ホール電極に達する位置まで直線状に形成されているこ
とを特徴としている。In the laminated common mode choke coil according to the limited aspect of the present invention, the first coil electrode is
It is characterized in that it is linearly formed from a position passing over the second through-hole electrode to a position reaching the first through-hole electrode.
【００１６】作用 本発明による積層コモンモードチョークコイルにおける
第１コイル電極と第２コイル電極のスパイラル形状によ
れば、１次コイル電極と２次コイル電極のスパイラル形
状が、従来の形状、すなわち図７に示す形状に比べ、第
２スルーホール電極近傍の１次及び２次コイル電極の重
なり領域が増加している。このため、絶縁層を介して対
向する１次コイル電極と２次コイル電極との重複部分が
増大することにより、両コイル間の磁気的結合が向上
し、その結果ノーマルモード信号に対するインピーダン
スが低下する。According to the spiral shape of the first coil electrode and the second coil electrode in the common mode choke coil laminated by the action present invention, the spiral shape of the primary coil electrode and the secondary coil electrodes, conventional shape, i.e., FIG. 7 The overlapping area of the primary and secondary coil electrodes near the second through-hole electrode is larger than that of the shape shown in FIG. Therefore, the overlapping portion of the primary coil electrode and the secondary coil electrode facing each other via the insulating layer is increased, so that the magnetic coupling between both coils is improved, and as a result, the impedance for the normal mode signal is lowered. .
【００１７】[0017]
【実施例】以下、本発明の一実施例につき図面を参照し
つつ説明することにより、本発明を明らかにする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be clarified by describing one embodiment of the present invention with reference to the drawings.
【００１８】図１は、本発明の実施例による積層コモン
モードチョークコイルの分解構造斜視図であり、図２
は、１次コイル電極及び２次コイル電極の平面パターン
を示す平面構造図であり、さらに図３は、図１中の切断
線Ｘ−Ｘに沿う方向からの断面構造図である。FIG. 1 is an exploded perspective view of a laminated common mode choke coil according to an embodiment of the present invention.
[Fig. 3] is a plan structural view showing a planar pattern of the primary coil electrode and the secondary coil electrode, and Fig. 3 is a sectional structural view from a direction along a cutting line XX in Fig. 1.
【００１９】図１及び図３を参照して、積層コモンモー
ドチョークコイル３０は、一対の磁性体基板３１，３７
と、その間に積層された複数の絶縁層３３Ａ，３３，３
５の積層体から構成されている。Referring to FIGS. 1 and 3, the laminated common mode choke coil 30 includes a pair of magnetic material substrates 31, 37.
And a plurality of insulating layers 33A, 33, 3 stacked between them
It is composed of five laminated bodies.
【００２０】磁性体基板３１，３７は、粉末成形により
作製されたＮｉ−Ｚｎ系フェライト基板から構成され
る。また、絶縁層３３，３５は、例えばポリイミドから
なる膜厚５μｍの絶縁薄膜から構成される。さらに、絶
縁層３３Ａは、例えばポリイミドからなる膜厚１５μｍ
の絶縁薄膜から構成される。The magnetic substrates 31 and 37 are composed of Ni--Zn type ferrite substrates produced by powder molding. The insulating layers 33 and 35 are made of, for example, an insulating thin film made of polyimide and having a film thickness of 5 μm. Further, the insulating layer 33A is made of, for example, polyimide and has a film thickness of 15 μm.
It is composed of an insulating thin film.
【００２１】１次コイル電極３２は、磁性体基板３１表
面上にスパッタ法により形成された膜厚１〜１０μｍの
Ａｇ膜をフォトリソグラフィによりスパイラル形状にパ
ターニングして形成されている。１次コイル電極３２の
一端は、同時にパターニングされた１次コイル用の第１
外部電極４０ａに接続され、他端は絶縁層３３，３５を
貫通するスルーホール内に形成された第１スルーホール
電極３８に接続されている。The primary coil electrode 32 is formed by patterning an Ag film having a film thickness of 1 to 10 μm formed on the surface of the magnetic substrate 31 by a sputtering method into a spiral shape by photolithography. One end of the primary coil electrode 32 has a first electrode for the primary coil that is simultaneously patterned.
The other end is connected to the external electrode 40a, and the other end is connected to the first through hole electrode 38 formed in the through hole penetrating the insulating layers 33 and 35.
【００２２】また、第２コイル電極３４は、絶縁層３３
（３５）の表面上にスパッタ法により形成された膜厚１
〜１０μｍのＡｇ膜をフォトリソグラフィによりスパイ
ラル形状にパターニングして形成されている。第２コイ
ル電極３４の一端は、同時にパターニングされた２次コ
イル用の第３の外部電極４１ａに接続され、また他端
は、絶縁層３５中に形成されたスルーホールの内部に形
成された第２スルーホール電極３９に接続されている。The second coil electrode 34 has an insulating layer 33.
Film thickness 1 formed by sputtering on the surface of (35)
It is formed by patterning an Ag film of 10 μm in a spiral shape by photolithography. One end of the second coil electrode 34 is connected to the simultaneously patterned third external electrode 41a for the secondary coil, and the other end is formed inside the through hole formed in the insulating layer 35. It is connected to the two through-hole electrodes 39.
【００２３】さらに、磁性体基板３７の表面にはＡｇの
薄膜パターンからなる第１及び第２引き出し電極３６
ａ，３６ｂが形成されている。第１引き出し電極３６ａ
は、その一端が第１スルーホール電極３８の端部３８ｂ
に接続され、他端が１次コイル用の第２外部電極４０ｂ
に接続されている。また、第２引き出し電極３６ｂは、
その一端が第２スルーホール電極３９の端部３９ｂに接
続され、他端が２次コイル用の第４外部電極４１ｂに接
続されている。Further, on the surface of the magnetic substrate 37, the first and second extraction electrodes 36 composed of a Ag thin film pattern are formed.
a and 36b are formed. First extraction electrode 36a
Has one end having an end portion 38b of the first through-hole electrode 38.
Second external electrode 40b for the primary coil connected to the
It is connected to the. In addition, the second lead electrode 36b is
One end thereof is connected to the end portion 39b of the second through hole electrode 39, and the other end thereof is connected to the fourth external electrode 41b for the secondary coil.
【００２４】そして、一対の磁性体基板３１，３７、絶
縁層３３Ａ，３３，３５及び１次コイル電極３２、２次
コイル電極３４及び引き出し電極３６ａ，３６ｂは、図
１に示す順にポリイミド接着剤により接着して積層され
ている。積層コモンモードチョークコイルは、多数の素
子が形成された積層基板からダイシングによりチップサ
イズに分割されて形成され、その両側部端面の一方に
は、１次コイル用の第１及び第２外部電極４０ａ，４０
ｂが露出し、他方には２次コイル用の第３外部電極４１
ａ、及び第４外部電極４１ｂが露出している。The pair of magnetic substrates 31, 37, the insulating layers 33A, 33, 35, the primary coil electrode 32, the secondary coil electrode 34, and the extraction electrodes 36a, 36b are formed by a polyimide adhesive in the order shown in FIG. Adhered and laminated. The laminated common mode choke coil is formed by dicing into a chip size from a laminated substrate on which a large number of elements are formed, and one of both end faces of the laminated common mode choke coil has first and second external electrodes 40a for the primary coil. , 40
b is exposed, and the third external electrode 41 for the secondary coil is exposed on the other side.
a and the fourth external electrode 41b are exposed.
【００２５】次に、１次コイル電極３２と２次コイル電
極３４のスパイラル形状について図２を参照して説明す
る。この１次コイル電極３２と２次コイル電極３４とは
絶縁層３３を介在して互いに対向している。図２に示す
ように、１次コイル電極３２は、図中Ａ点からＢ、Ｃ・
・・Ｋ点を経てＬ点までスパイラル状に形成され、Ｌ点
において第１スルーホール電極３８に接続されている。Next, the spiral shapes of the primary coil electrode 32 and the secondary coil electrode 34 will be described with reference to FIG. The primary coil electrode 32 and the secondary coil electrode 34 face each other with the insulating layer 33 interposed therebetween. As shown in FIG. 2, the primary coil electrode 32 is arranged from point A to point B, C, ...
.. A spiral shape is formed from the point K to the point L, and is connected to the first through-hole electrode 38 at the point L.
【００２６】また、２次コイル電極は、ほぼＢ点から延
び、Ｃ、Ｄ・・・Ｊ点を経てＫ点において第２スルーホ
ール電極３９に接続されている。そして、１次コイル電
極３２と２次コイル電極３４は、Ｂ点からＫ点に至る部
分が紙面垂直方向において重複して形成されている。The secondary coil electrode extends substantially from point B and is connected to the second through-hole electrode 39 at point K via points C, D ... J. Then, the primary coil electrode 32 and the secondary coil electrode 34 are formed such that the portions from the point B to the point K overlap in the direction perpendicular to the paper surface.
【００２７】また、Ｋ点からＬ点に至る間は、１次コイ
ル電極３２のみが形成されている。このＫ点とＬ点との
間はできる限り短く形成することが好ましい。従って、
このＫ点とＬ点の間の距離は、第１スルーホール電極３
８と第２スルーホール電極３９のプロセス上の制約を満
たす限り短い距離に形成されることが好ましい。Further, only the primary coil electrode 32 is formed from the point K to the point L. It is preferable to form the distance between the K point and the L point as short as possible. Therefore,
The distance between the K point and the L point is determined by the first through hole electrode 3
8 and the second through-hole electrode 39 are preferably formed at a short distance as long as the process constraint is satisfied.
【００２８】このような１次／２次コイル電極のスパイ
ラル形状は、例えば図７に示す従来のスパイラル形状に
比べて、スルーホール電極近傍での１次／２次コイル電
極の重なり部分が増大されている。このために、従来こ
の領域で磁気的結合が弱まり、ノーマルモード信号に対
するインピーダンスが増大する現象が生じたのに対し、
本発明においては、ノーマルモード信号に対するインピ
ーダンスを従来のものに比べて低減することができた。
その改善されたインピーダンス特性を図４に示す。横軸
はノーマルモード信号の周波数ｆを示し、縦軸はそのイ
ンピーダンスの絶対値｜Ｚ｜を示している。図４から明
らかなように、本発明による積層コモンモードチョーク
コイルは、ノーマルモード信号の全ての周波数域に亘っ
て、従来のものに比べてインピーダンスが低下してい
る。これによって、ノーマルモード信号の波形の変動を
防止することができる。In such a spiral shape of the primary / secondary coil electrode, the overlapping portion of the primary / secondary coil electrodes in the vicinity of the through-hole electrode is increased as compared with the conventional spiral shape shown in FIG. ing. For this reason, in the past, magnetic coupling weakened in this region, and the phenomenon in which the impedance for normal mode signals increased increased, whereas
In the present invention, the impedance with respect to the normal mode signal can be reduced as compared with the conventional one.
The improved impedance characteristic is shown in FIG. The horizontal axis represents the frequency f of the normal mode signal, and the vertical axis represents the absolute value | Z | of its impedance. As is apparent from FIG. 4, the laminated common mode choke coil according to the present invention has a lower impedance than the conventional one over the entire frequency range of the normal mode signal. This can prevent the waveform of the normal mode signal from changing.
【００２９】[0029]
【発明の効果】以上のように、本発明による積層コモン
モードチョークコイルは、１次コイル電極のスパイラル
形状と、２次コイル電極のスパイラル形状とをほぼ同一
形状に形成することによって両コイル間の重複領域を増
大させるように構成したことにより、両コイル間の磁気
結合を向上させ、ノーマルモード信号に対するインピー
ダンスを低下させることによってノーマルモード信号に
対する信号波形の変動が少なく、かつコモンモードノイ
ズの除去特性に優れた積層コモンモードチョークコイル
を実現することができる。As described above, in the laminated common mode choke coil according to the present invention, the spiral shape of the primary coil electrode and the spiral shape of the secondary coil electrode are formed in substantially the same shape, so that the coil shape between both coils is increased. By configuring to increase the overlap area, the magnetic coupling between both coils is improved, and the impedance for the normal mode signal is lowered, so that the fluctuation of the signal waveform for the normal mode signal is small and the common mode noise removal characteristic is reduced. It is possible to realize an excellent laminated common mode choke coil.
【図１】本発明の実施例による積層コモンモードチョー
クコイルの分解構造斜視図。FIG. 1 is an exploded perspective view of a laminated common mode choke coil according to an embodiment of the present invention.
【図２】図１に示す積層コモンモードチョークコイルの
１次／２次コイル電極のスパイラル形状を示す平面構造
図。FIG. 2 is a plan view showing a spiral shape of primary / secondary coil electrodes of the laminated common mode choke coil shown in FIG.
【図３】図１中の切断線Ｘ−Ｘに沿った方向からの断面
構造図。FIG. 3 is a cross-sectional structural view from a direction along a cutting line XX in FIG.
【図４】図１に示す積層コモンモードチョークコイルの
インピーダンス特性を示す特性図。FIG. 4 is a characteristic diagram showing impedance characteristics of the laminated common mode choke coil shown in FIG.
【図５】従来の一例による積層コモンモードチョークコ
イルの外観斜視図。FIG. 5 is an external perspective view of a laminated common mode choke coil according to a conventional example.
【図６】従来の他の例による積層コモンモードチョーク
コイルの分解構造斜視図。FIG. 6 is an exploded perspective view of a laminated common mode choke coil according to another conventional example.
【図７】図６に示す積層コモンモードチョークコイルの
１次／２次コイル電極のスパイラル形状を示す平面構造
図。7 is a plan view showing the spiral shape of the primary / secondary coil electrodes of the laminated common mode choke coil shown in FIG.
【図８】図６中における切断線Ｙ−Ｙに沿った方向から
の断面構造図。FIG. 8 is a cross-sectional structural view from a direction along a cutting line YY in FIG.
３０…積層コモンモードチョークコイル ３１，３７…磁性体基板 ３２…１次コイル電極 ３３Ａ，３３，３５…絶縁層 ３４…２次コイル電極 ３６ａ，３６ｂ…第１及び第２引き出し電極 ３８…第１スルーホール電極 ３９…第２スルーホール電極 ４０ａ…第１外部電極 ４０ｂ…第２外部電極 ４１ａ…第３外部電極 ４１ｂ…第４外部電極 30 ... Laminated common mode choke coil 31, 37 ... Magnetic substrate 32 ... Primary coil electrode 33A, 33, 35 ... Insulating layer 34 ... Secondary coil electrode 36a, 36b ... First and second extraction electrode 38 ... First through Hall electrode 39 ... Second through-hole electrode 40a ... First external electrode 40b ... Second external electrode 41a ... Third external electrode 41b ... Fourth external electrode
Claims (2)
てなる積層体の厚み方向において互いに異なる層に第１
及び第２コイル電極を形成するとともに、前記積層体の
端部に第１〜第４外部電極を形成し、前記第１及び第２
コイル電極の一端が、各々前記第１及び第３外部電極に
接続され、他端が、各々第１及び第２スルーホール電極
を介して前記第２及び第４外部電極に接続された積層コ
モンモードチョークコイルにおいて、 前記第１コイル電極及び前記第２コイル電極は、スパイ
ラル形状に形成されており、 さらに、前記第１コイル電極は、前記第１外部電極との
接続部から延び、最初に前記第２コイル電極と重複する
位置から前記第２スルーホール電極に達する位置まで、
前記第２コイル電極と重複する形状に形成されているこ
とを特徴とする、積層コモンモードチョークコイル。1. A layered body in which an insulating layer is sandwiched between a pair of magnetic substrates, the layers being different from each other in the thickness direction.
And second coil electrodes are formed, and first to fourth external electrodes are formed at end portions of the laminated body, and the first and second external electrodes are formed.
A laminated common mode in which one ends of coil electrodes are connected to the first and third external electrodes, respectively, and the other ends are connected to the second and fourth external electrodes via first and second through-hole electrodes, respectively. In the choke coil, the first coil electrode and the second coil electrode are formed in a spiral shape, and further, the first coil electrode extends from a connection portion with the first external electrode, and first From the position overlapping the two coil electrodes to the position reaching the second through hole electrode,
A laminated common mode choke coil, which is formed in a shape overlapping with the second coil electrode.
ホール電極上を通過した位置から前記第１スルーホール
電極に達する位置まで直線状に形成されていることを特
徴とする、請求項１に記載の積層コモンモードチョーク
コイル。2. The first coil electrode is linearly formed from a position passing on the second through-hole electrode to a position reaching the first through-hole electrode. The laminated common mode choke coil described in.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08076793A JP3139368B2 (en) | 1995-04-03 | 1996-03-29 | Multilayer common mode choke coil |
| US09/075,197 US6356181B1 (en) | 1996-03-29 | 1998-05-11 | Laminated common-mode choke coil |
| US10/051,043 US6618929B2 (en) | 1996-03-29 | 2002-01-22 | Laminated common-mode choke coil |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7775395 | 1995-04-03 | ||
| JP7-77753 | 1995-04-03 | ||
| JP08076793A JP3139368B2 (en) | 1995-04-03 | 1996-03-29 | Multilayer common mode choke coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08335517A true JPH08335517A (en) | 1996-12-17 |
| JP3139368B2 JP3139368B2 (en) | 2001-02-26 |
Family
ID=26417922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08076793A Expired - Lifetime JP3139368B2 (en) | 1995-04-03 | 1996-03-29 | Multilayer common mode choke coil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3139368B2 (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1089302A1 (en) * | 1999-09-30 | 2001-04-04 | Tokin Corporation | Substrate-mounted common mode choke coil and method of manufacture thereof |
| JP2003133135A (en) * | 2001-10-23 | 2003-05-09 | Murata Mfg Co Ltd | Coil part |
| JP2005044834A (en) * | 2003-07-22 | 2005-02-17 | Mitsubishi Materials Corp | Laminated common mode choke coil and its manufacturing method |
| JP2005116647A (en) * | 2003-10-06 | 2005-04-28 | Tdk Corp | Common mode choke coil, manufacturing method thereof, and common mode choke coil array |
| US6998939B2 (en) | 2000-03-08 | 2006-02-14 | Matsushita Electric Industrial Co., Ltd. | Noise filter and electronic device using noise filter |
| US7023299B2 (en) | 2003-11-28 | 2006-04-04 | Tdk Corporation | Thin-film common mode filter and thin-film common mode filter array |
| US7064629B2 (en) | 2003-11-28 | 2006-06-20 | Tdk Corporation | Thin-film common mode filter and thin-film common mode filter array |
| JP2006245369A (en) * | 2005-03-04 | 2006-09-14 | Matsushita Electric Ind Co Ltd | Common-mode noise filter |
| JP2007053254A (en) * | 2005-08-18 | 2007-03-01 | Tdk Corp | Electronic components and manufacturing method thereof |
| JP2008053447A (en) * | 2006-08-24 | 2008-03-06 | Tdk Corp | Coil component and manufacturing method thereof |
| JP2008306014A (en) * | 2007-06-08 | 2008-12-18 | Tdk Corp | Common mode choke coil |
| JP2009212255A (en) * | 2008-03-04 | 2009-09-17 | Tdk Corp | Coil part and method of manufacturing the same |
| JP5182087B2 (en) * | 2006-03-29 | 2013-04-10 | 日立金属株式会社 | Coil component and manufacturing method thereof |
-
1996
- 1996-03-29 JP JP08076793A patent/JP3139368B2/en not_active Expired - Lifetime
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1089302A1 (en) * | 1999-09-30 | 2001-04-04 | Tokin Corporation | Substrate-mounted common mode choke coil and method of manufacture thereof |
| JP2009302580A (en) * | 2000-03-08 | 2009-12-24 | Panasonic Corp | Noise filter and electronic device using the same |
| US6998939B2 (en) | 2000-03-08 | 2006-02-14 | Matsushita Electric Industrial Co., Ltd. | Noise filter and electronic device using noise filter |
| JP4706786B2 (en) * | 2000-03-08 | 2011-06-22 | パナソニック株式会社 | Noise filter and electronic device using noise filter |
| JP2003133135A (en) * | 2001-10-23 | 2003-05-09 | Murata Mfg Co Ltd | Coil part |
| JP2005044834A (en) * | 2003-07-22 | 2005-02-17 | Mitsubishi Materials Corp | Laminated common mode choke coil and its manufacturing method |
| JP2005116647A (en) * | 2003-10-06 | 2005-04-28 | Tdk Corp | Common mode choke coil, manufacturing method thereof, and common mode choke coil array |
| US7023299B2 (en) | 2003-11-28 | 2006-04-04 | Tdk Corporation | Thin-film common mode filter and thin-film common mode filter array |
| US7064629B2 (en) | 2003-11-28 | 2006-06-20 | Tdk Corporation | Thin-film common mode filter and thin-film common mode filter array |
| JP2006245369A (en) * | 2005-03-04 | 2006-09-14 | Matsushita Electric Ind Co Ltd | Common-mode noise filter |
| JP2007053254A (en) * | 2005-08-18 | 2007-03-01 | Tdk Corp | Electronic components and manufacturing method thereof |
| US8050045B2 (en) | 2005-08-18 | 2011-11-01 | Tdk Corporation | Electronic component and method of manufacturing the same |
| JP5182087B2 (en) * | 2006-03-29 | 2013-04-10 | 日立金属株式会社 | Coil component and manufacturing method thereof |
| JP2008053447A (en) * | 2006-08-24 | 2008-03-06 | Tdk Corp | Coil component and manufacturing method thereof |
| US7616085B2 (en) | 2007-06-08 | 2009-11-10 | Tdk Corporation | Common mode choke coil |
| JP2008306014A (en) * | 2007-06-08 | 2008-12-18 | Tdk Corp | Common mode choke coil |
| JP2009212255A (en) * | 2008-03-04 | 2009-09-17 | Tdk Corp | Coil part and method of manufacturing the same |
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|---|---|
| JP3139368B2 (en) | 2001-02-26 |
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