JPH11354327A - Coil capable of reducing leakage flux and its manufacture - Google Patents

Coil capable of reducing leakage flux and its manufacture

Info

Publication number
JPH11354327A
JPH11354327A JP17207998A JP17207998A JPH11354327A JP H11354327 A JPH11354327 A JP H11354327A JP 17207998 A JP17207998 A JP 17207998A JP 17207998 A JP17207998 A JP 17207998A JP H11354327 A JPH11354327 A JP H11354327A
Authority
JP
Japan
Prior art keywords
coil
magnetic
core
shield case
magnetic 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.)
Pending
Application number
JP17207998A
Other languages
Japanese (ja)
Inventor
Masahiro Furuya
正弘 古屋
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.)
Citizen Electronics Co Ltd
Original Assignee
Citizen Electronics Co Ltd
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 Citizen Electronics Co Ltd filed Critical Citizen Electronics Co Ltd
Priority to JP17207998A priority Critical patent/JPH11354327A/en
Publication of JPH11354327A publication Critical patent/JPH11354327A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To prevent electromagnetic interference between parts, by reducing the leakage flux from a coil terminal section provided to the core of a coil for a circuit. SOLUTION: A coil 5 has an internally strained area 7 between the winding section 3 of its core 1 made of a magnetic material, such as pure iron, silicon steel, permalloy, etc., and coil terminal sections 4 so that the magnetic reluctance of the part may be increased. Since the magnetic fluxes generated by the winding section 3 of the core 3 hardly passes through this part and goes out of the core 1 on this side of the part, the magnetic fluxes are nearly completely restricted into a shield case, and a shield effect can be obtained when the coil is housed in the shield case. Since the magnetic fluxes do not spread, such a case that the coil can be used without the shield case also increases. In order to form the strain area 7 in the core 1, the part is pressed or heated before of after winding. Alternatively, the part is both pressed and heated in arbitrary order. It if also possible to simultaneously perform pressing on and heating by using a welding machine, thermocompression bonding machine, etc.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、各種の電気、電子
回路に用いる磁心入りのコイルであって、電磁的な干渉
を防ぐために漏洩磁束を軽減する手段を講じたものに関
する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil containing a magnetic core for use in various electric and electronic circuits, which is provided with means for reducing magnetic flux leakage in order to prevent electromagnetic interference.

【0002】[0002]

【従来の技術】各種の電気、電子回路に用いられるコイ
ル、例えばEL駆動回路における昇圧回路のチョーク・
コイル等は、近年、電子回路の表面実装に適する小型の
ものが多く用いられ、回路動作の確実のために、これら
のコイルに関し部品間の磁気的、電磁的な干渉やコイル
同士の相互誘導を防ぐことが求められる。そのための方
法の一つは、コイルを磁性材のシールド・ケースに納め
ることであって、図2と図3にそのようなコイルの一例
を示す。
2. Description of the Related Art A coil used in various electric and electronic circuits, for example, a choke for a booster circuit in an EL drive circuit.
In recent years, small coils suitable for surface mounting of electronic circuits are often used, and in order to ensure the operation of the circuit, magnetic and electromagnetic interference between these components and mutual induction between coils are required to ensure the operation of the circuit. It is required to prevent it. One way to do this is to place the coil in a shielded case made of magnetic material. FIGS. 2 and 3 show an example of such a coil.

【0003】図2(A)はコイルの磁心1であり、純
鉄、珪素鋼板、パーマロイ等の磁性材料で作って表面を
絶縁したもので、巻き線をするための棒状の中央部とそ
の両端にあって中央部に直交する部分とで、大略H字状
をなしている。さらに端部の一方に2本の枝部2が設け
てある。この磁心1に同図(B)のように巻き線3を施
してコイル5を形成し、巻き線3の両端末を磁心1の2
本の枝部2にそれぞれ巻き付け、枝部を溶融ハンダ槽に
浸漬するなどして固定し、コイル端末4にしてある。
FIG. 2A shows a magnetic core 1 of a coil, which is made of a magnetic material such as pure iron, silicon steel plate, permalloy and the like and whose surface is insulated. A rod-shaped central portion for winding and both ends thereof And a portion that is orthogonal to the central portion, is substantially H-shaped. Furthermore, two branches 2 are provided at one of the ends. As shown in FIG. 1B, a winding 3 is formed on the magnetic core 1 to form a coil 5, and both ends of the winding 3 are connected to two ends of the magnetic core 1.
A coil terminal 4 is wound around each branch 2 and fixed by immersing the branch in a molten solder tank.

【0004】このようなコイル5をシールド・ケースに
納めたのが図3(A)のものである。同図のシールド・
ケース11は純鉄、珪素鋼板、パーマロイ等の磁性材料
の板材を曲げ加工して一体構造の箱状にしたもので、コ
イルを納めた状態では、切り欠き部から磁心1の枝部2
とコイル端末4が出ているだけである。磁心1の両端の
部分をシールド・ケース11に当接させるか接合するか
すれば、シールド・ケース11自体が磁路の一部となっ
て磁心1の両端を閉ループ状に接続し、コイルが閉磁路
を持つことになって性能向上と漏洩磁束の防止が図られ
る。
FIG. 3A shows such a coil 5 housed in a shield case. The shield
The case 11 is formed by bending a plate material of a magnetic material such as pure iron, silicon steel plate, or permalloy to form a box of an integral structure.
And the coil terminal 4 has just come out. If both ends of the magnetic core 1 are brought into contact with or joined to the shield case 11, the shield case 11 itself becomes a part of a magnetic path, and both ends of the magnetic core 1 are connected in a closed loop. With this, the performance is improved and the leakage magnetic flux is prevented.

【0005】このようなシールド・ケース入りコイルの
回路基板への実装は、図3(B)に示すようにシールド
・ケース11を回路基板21に設けた穴または窪み22
に一部沈め、コイル端末4をハンダのリフローなどによ
って回路基板21上の導電パターンに接合するのであ
る。同図に見るように、シールド・ケース11にはコイ
ル端末4と反対側の端面に突起12があって回路基板2
1に当接し、シールド・ケース入りコイルを回路基板2
1に平行に保持する。
As shown in FIG. 3 (B), the shield case 11 is mounted on a circuit board 21 by mounting a shield case 11 on a circuit board 21 with holes or recesses 22 provided in the circuit board 21.
The coil terminal 4 is joined to the conductive pattern on the circuit board 21 by solder reflow or the like. As shown in the figure, the shield case 11 has a projection 12 on the end face opposite to the coil terminal 4 so that the circuit board 2
Abuts on the circuit board 2
Hold parallel to 1.

【0006】[0006]

【発明が解決しようとする課題】上記のような従来の製
品は、コイルがシールド・ケース中にほぼ完全に収容さ
れている上、シールドケースが磁路の一部を構成してコ
イルを閉磁路にしていて好条件なのであるが、それでも
磁束の漏洩を無くすことができない。図3(A)に見る
ように、シールド・ケース11の切り欠き部から磁心1
の枝部2が突き出しているため、磁束の一部が枝部2を
通って外部に洩れるのであり、特に枝部2の端面6から
の漏洩磁束が大きい。このようにシールド・ケース11
から磁心1の一部が突き出している構成は、図3(B)
のようにコイル端末4を回路基板21に接続する上でや
むを得ないことであるが、磁束漏洩の原因になってシー
ルド・ケースを設けてあるにもかかわらずその効果を大
幅に減殺していた。本発明は、このような磁心の枝部か
らの磁束の漏洩を軽減し、場合によってはシールド・ケ
ースなしで使用できるコイルを提供するものである。
In the conventional products as described above, the coil is almost completely housed in the shield case, and the shield case forms a part of the magnetic path to close the coil. This is a good condition, but it still does not eliminate magnetic flux leakage. As shown in FIG. 3A, the magnetic core 1 extends from the notch of the shield case 11.
Is protruded, a part of the magnetic flux leaks to the outside through the branch 2, and particularly the leakage magnetic flux from the end face 6 of the branch 2 is large. Thus, the shield case 11
The configuration in which a part of the magnetic core 1 is projected from FIG.
Although it is unavoidable to connect the coil terminal 4 to the circuit board 21 as described above, the effect is greatly reduced even though the shield case is provided to cause a magnetic flux leakage. The present invention provides a coil that can reduce the leakage of the magnetic flux from the branches of the magnetic core and can be used without a shield case in some cases.

【0007】[0007]

【課題を解決するための手段】上記の目的を達成するた
め、本発明はコイルの磁心にて巻き線を施す部分とコイ
ル端末を固定する部分の間に磁気抵抗の大きな領域を設
けることにより、磁束がこの部分を通りにくいようにす
る。こうすれば、例えば図2(B)のようなコイル5を
図3のようにシールド・ケース11に収容したものにお
いて、巻き線箇所の磁心を通る磁束は枝部2に入ること
が困難になり、大部分がコイル端末4よりも巻き線寄り
の箇所で磁心1から外に出るのであって、磁束の存在が
シールド・ケース11内に限定され、枝部2の側面やそ
の端面6からの漏洩磁束が大幅に減少する。
In order to achieve the above object, the present invention provides a large magnetic resistance area between a portion where a coil is wound by a magnetic core and a portion where a coil terminal is fixed. Make it difficult for magnetic flux to pass through this part. In this way, for example, in the case where the coil 5 as shown in FIG. 2 (B) is housed in the shield case 11 as shown in FIG. Most of the magnetic flux exits from the magnetic core 1 at a position closer to the winding than the coil end 4, and the existence of the magnetic flux is limited to the inside of the shield case 11, and the leakage from the side surface of the branch 2 and the end surface 6 thereof Magnetic flux is greatly reduced.

【0008】磁心の一部の磁気抵抗を大きくするのは、
その部分の材料内部に歪みを与えることによって行う。
一般に、磁心の材料として用いる純鉄、珪素鋼板、パー
マロイ等の磁性材は、磁性が材料の内部構造に非常に敏
感で、透磁率、保持力、ヒステリシス損等が組織の不均
一に大きな影響を受け、材料の歪みは透磁率を低下させ
る。従ってこれらの磁性材で作った磁心は、所定の形状
に加工後、磁性を良好にするため歪み取り焼鈍して材料
を標準状態にするのが一般である。本発明は磁性材のこ
のような性質を利用し、磁心の一部に内部的な歪みを与
えることによって、この部分の磁性を下げて磁束が通り
にくくするのである。磁心内部を歪ませる方法として
は、その部分を加圧あるいは加熱するか、あるいはこれ
らを併用する。
The reason for increasing the reluctance of a part of the magnetic core is as follows.
This is performed by giving a strain to the inside of the material at that portion.
Generally, magnetic materials such as pure iron, silicon steel plate, and permalloy used as the material of the magnetic core are very sensitive to the internal structure of the material, and the magnetic permeability, coercive force, hysteresis loss, etc. have a large effect on the non-uniformity of the structure. As a result, distortion of the material lowers the magnetic permeability. Therefore, a magnetic core made of such a magnetic material is generally processed into a predetermined shape and then subjected to strain relief annealing in order to improve the magnetism so that the material is in a standard state. The present invention makes use of such properties of the magnetic material and imparts internal strain to a part of the magnetic core, thereby lowering the magnetism of this part and making it difficult for magnetic flux to pass. As a method of distorting the inside of the magnetic core, the part is pressurized or heated, or both are used.

【0009】[0009]

【発明の実施の形態】以下、図面に基づいて本発明の実
施形態を説明する。なお、以上の説明を含め、同種の部
品や部分については同じ符号を用いることにする。図1
は本発明のコイルで(A)は平面図、(B)は正面図で
あり、純鉄、珪素鋼板、パーマロイ等の磁性材で作った
磁心1は棒状部の両端にこれに直交する端部があるH字
状で、一方の端部にはさらに2本の枝部2を設け、前述
のように巻き線端末を枝部2に巻き付けて固定し、コイ
ル端末4にしてある。
Embodiments of the present invention will be described below with reference to the drawings. Note that the same reference numerals are used for the same kind of parts and parts including the above description. FIG.
Is a coil of the present invention, (A) is a plan view, (B) is a front view, and a magnetic core 1 made of a magnetic material such as pure iron, silicon steel plate, permalloy, etc. There is a certain H-shape, and two branch portions 2 are further provided at one end, and a winding terminal is wound around the branch portion 2 and fixed as described above to form a coil terminal 4.

【0010】同図にて、磁心1の巻き線部と枝部2の間
の斜線を施した部分7が、磁心1の材料内部に歪みを生
じさせた領域である。この歪み領域7では材料の磁性が
劣化して磁気抵抗が増えるため、磁心1の棒状の巻き線
部に生じた磁束は、歪み領域7で遮られて枝部6に入る
ことができず、歪み領域7の手前で磁心1から出て行
く。そのため枝部2の端面6から出る磁束は従来よりも
大幅に減少する。従って、このコイル5を図3のように
シールド・ケース11に入れた場合、磁束はほぼ完全に
シールド・ケース内に納まって遮蔽効果が非常に大きく
なる。また枝部2からの磁束の漏洩の心配がなくなるか
らコイル端末4の形状や長さの自由度が増し、電磁干渉
が一層少なくて取り扱いの便利なコイルを設計できる。
In FIG. 1, a hatched portion 7 between the winding portion and the branch portion 2 of the magnetic core 1 is a region in which the material inside the magnetic core 1 is distorted. Since the magnetic properties of the material deteriorate in the strained region 7 and the reluctance increases, the magnetic flux generated in the rod-shaped winding portion of the magnetic core 1 is blocked by the strained region 7 and cannot enter the branch portion 6. It exits from the magnetic core 1 just before the region 7. Therefore, the magnetic flux emitted from the end face 6 of the branch 2 is significantly reduced as compared with the conventional case. Therefore, when the coil 5 is placed in the shield case 11 as shown in FIG. 3, the magnetic flux is almost completely contained in the shield case, and the shielding effect becomes very large. Further, since there is no need to worry about leakage of magnetic flux from the branch portion 2, the degree of freedom of the shape and length of the coil terminal 4 is increased, and a coil with less electromagnetic interference and convenient handling can be designed.

【0011】磁心1に歪み領域7を形成する方法である
が、その一つはこの部分を図1(B)の矢印8のように
加圧することである。これにはプレス等を用い、荷重は
板厚にもよるが1〜数Kg/mm2 が適当である。
A method for forming a strained region 7 in the magnetic core 1 is one of which is to press this portion as shown by an arrow 8 in FIG. For this, a press or the like is used, and the load is suitably 1 to several kg / mm 2 although it depends on the plate thickness.

【0012】歪みを生じさせる他の方法は、歪み領域7
の部分を短時間、局部的に加熱することで、これはレー
ザーやキセノン・ランプ等により1〜5秒間、600〜
800℃に加熱する。
Another method of producing distortion is to use the distortion region 7
Is heated locally for a short period of time, and this is done for 600 seconds with a laser or xenon lamp for 1-5 seconds.
Heat to 800 ° C.

【0013】このように加圧または加熱によって歪み領
域7を形成するが、加圧と加熱の両方を適宜の順序で行
って、歪みの状況を制御することもできる。あるいは加
圧と加熱を同時に行うこともでき、それには熱圧着機や
溶接機を使うのが便利である。これらの装置は二つの部
分を接合するものであり、これを用いて磁心に歪みを与
えるのは本来の用法ではないが、いずれの装置も加圧と
加熱を伴うので本発明の実施に利用できるのである。
As described above, the strained region 7 is formed by pressurizing or heating. However, both the pressurizing and heating can be performed in an appropriate order to control the state of the strain. Alternatively, pressurization and heating can be performed at the same time, and it is convenient to use a thermocompression bonding machine or a welding machine. These devices join two parts, and it is not the original use to give a strain to the magnetic core by using them. However, since both devices involve pressurization and heating, they can be used for practicing the present invention. It is.

【0014】本発明のコイルについて実測したところ、
磁心の枝部2の端面6から出る磁束を従来のコイルと比
較して約50%低下させることができた。このように本
発明のコイルでは、磁心を出た磁束が空間に広がらず巻
き線の近傍に留まるから、要求される回路仕様がさほど
厳しくないなら、コイルをシールド・ケースに入れない
で用いて差し支えない場合もある。シールド・ケースな
しのコイルであれば、当然、部品の小型化になる。
When the coil of the present invention was actually measured,
The magnetic flux emitted from the end face 6 of the branch 2 of the magnetic core could be reduced by about 50% as compared with the conventional coil. As described above, in the coil of the present invention, since the magnetic flux exiting the magnetic core does not spread to the space and stays in the vicinity of the winding, if the required circuit specifications are not so severe, the coil can be used without being put in the shield case. Not always. A coil without a shield case naturally reduces the size of components.

【0015】図2の従来のコイル5は磁心1の形状が大
略H字型であるが、枝部2以外にも輪郭に突起や窪みを
設けてあり、これは図3のようにシールド・ケース11
に納めた時、ケースの内側と適切に組合わさって保持さ
れるためであるが、シールド・ケースを用いないならそ
のような制約がないから磁心1の輪郭をより単純にで
き、抜き型が簡単になって加工性が上がる。図1のコイ
ル5をシールド・ケースなしで回路基板に実装する場
合、図3の回路基板21の穴または窪み22を小形にし
たものに巻き線3を一部沈め、磁心1の両端を回路基板
面に乗せれば、コイル5を回路基板に平行に保ってコイ
ル端末4を導電パターンに接続することができる。
In the conventional coil 5 shown in FIG. 2, the shape of the magnetic core 1 is substantially H-shaped, but a projection or a dent is provided in the contour other than the branch portion 2, which is a shield case as shown in FIG. 11
This is because when it is stored in the case, it is held in appropriate combination with the inside of the case, but if there is no shield case, there is no such restriction, so the contour of the magnetic core 1 can be made simpler and the punching die is easy And the workability increases. When the coil 5 of FIG. 1 is mounted on a circuit board without a shield case, the winding 3 is partially sunk in a circuit board 21 of FIG. If placed on a surface, the coil terminal 4 can be connected to the conductive pattern while keeping the coil 5 parallel to the circuit board.

【0016】本発明によるコイルの製造工程の一例を、
磁心を中心に記せば次のごとくである。プレス抜き→バ
レル→焼鈍→メッキ→絶縁処理→部分加熱→加圧→巻き
線バレルはプレス抜きで生じたバリ取りのために行う。
焼鈍は材料の歪みを除去して磁性を整えるのであり、例
えばパーマロイは1100℃、珪素鋼板は800〜85
0℃に1〜3時間保って徐冷する。メッキはニッケルメ
ッキなどである。絶縁処理は巻き線部にポリエステル等
の絶縁テープを巻いたり、粉体塗装、静電塗装あるいは
化学蒸着等で表面に絶縁被膜を形成したりするものであ
る。次の部分加熱と加圧が本発明の特徴とする磁心に部
分的な内部歪みを生じさせる加工であり、前述のような
方法で行う。上記の工程は一例であって、加熱と加圧は
どちらか一方だけで済むならもちろん一方だけでよく、
両方行う場合も順序を入れ替えたり溶接機等を用いて同
時に行ったりすることは任意である。また部分加熱や加
圧を巻き線後に行うこともできる。製品仕様によっては
バレルやメッキを省略する場合もある。
One example of the manufacturing process of the coil according to the present invention is as follows.
It is as follows if it centers on a magnetic core. Press punching → barrel → annealing → plating → insulation treatment → partial heating → pressing → winding barrel is used to remove burrs generated by press punching.
Annealing removes distortion of the material to adjust the magnetism. For example, permalloy is 1100 ° C., and silicon steel sheet is 800 to 85.
Keep at 0 ° C for 1-3 hours and slowly cool. The plating is nickel plating or the like. The insulation treatment involves winding an insulation tape such as polyester around the winding portion, or forming an insulation film on the surface by powder coating, electrostatic coating, chemical vapor deposition, or the like. Subsequent partial heating and pressurization are processes that cause partial internal strain in the magnetic core, which is a feature of the present invention, and are performed by the method described above. The above process is an example, and if only one of heating and pressurization is sufficient, of course only one is sufficient,
In the case of performing both, it is optional to change the order or perform them simultaneously using a welding machine or the like. In addition, partial heating or pressurization can be performed after winding. Depending on the product specifications, the barrel and plating may be omitted.

【0017】[0017]

【発明の効果】以上の説明から明らかなように、本発明
によれば磁心のコイル端末部からの漏洩磁束を大幅に減
らして、シールド・ケースに納めた場合の遮蔽効果を上
げることができる。これにより部品間の電磁的な干渉が
防がれるとともに、コイル端末部の形状や長さの選択の
自由度が増し、より使いやすく便利なコイルを設計でき
る。回路の仕様によってはシールド・ケースを省いてコ
イルだけを取り付けることのできる場合が増え、回路の
小型化と部品コストの削減が可能になる。このように本
発明によって小型で高性能のコイルを廉価に実現できる
のである。
As is apparent from the above description, according to the present invention, the magnetic flux leaking from the coil terminal portion of the magnetic core can be greatly reduced, and the shielding effect when the magnetic core is housed in the shield case can be improved. This prevents electromagnetic interference between the components, increases the degree of freedom in selecting the shape and length of the coil end portion, and makes it possible to design a more convenient and convenient coil. Depending on the specifications of the circuit, the number of cases where the shield case can be omitted and only the coil can be attached increases, and the circuit can be reduced in size and the component cost can be reduced. As described above, according to the present invention, a small and high-performance coil can be realized at low cost.

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

【図1】本発明のコイルを示し、(A)は平面図、
(B)は正面図である。
FIG. 1 shows a coil of the present invention, (A) is a plan view,
(B) is a front view.

【図2】従来のコイルを示し、(A)は磁心の斜視図、
(B)はこれに巻き線をしたコイルの斜視図である。
FIG. 2 shows a conventional coil, (A) is a perspective view of a magnetic core,
(B) is a perspective view of a coil wound around this.

【図3】図2のコイルをシールド・ケースに納めたもの
を示し、(A)は斜視図、(B)はこれを回路基板に実
装した状態の側面図である。
3A and 3B show the coil of FIG. 2 housed in a shield case, wherein FIG. 3A is a perspective view and FIG. 3B is a side view of a state where the coil is mounted on a circuit board.

【符号の説明】[Explanation of symbols]

1 磁心 2 枝部 3 巻き線 4 コイル端末 7 歪み領域 11 シールド・ケース 21 回路基板 DESCRIPTION OF SYMBOLS 1 Magnetic core 2 Branch part 3 Winding 4 Coil terminal 7 Strain area 11 Shield case 21 Circuit board

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 磁性材料の磁心に巻き線を施し、磁心の
一部に巻き線の端末を巻き付けて固定してコイル端末と
するコイルにおいて、 磁心の巻き線部とコイル端末部の間に、材料内部に歪み
を生じて磁気抵抗の増した部分を設けたことを特徴とす
る漏洩磁束を軽減するコイル。
Claims: 1. A coil in which a winding is applied to a magnetic core made of a magnetic material, and a terminal of the winding is wound around a part of the magnetic core and fixed to form a coil end. A coil for reducing leakage magnetic flux, characterized in that a portion having increased magnetic resistance due to distortion inside the material is provided.
【請求項2】 請求項1に記載の漏洩磁束を軽減するコ
イルの製造方法であって、 磁心の前記の部分を加圧し、または加熱し、または両者
を併用することによって材料内部に歪みを生じさせ磁気
抵抗を増すことを特徴とする漏洩磁束を軽減するコイル
の製造方法。
2. The method for manufacturing a coil for reducing magnetic flux leakage according to claim 1, wherein the material is distorted by pressurizing or heating the magnetic core, or by using both of them. A method for manufacturing a coil for reducing leakage magnetic flux, characterized by increasing magnetic resistance.
JP17207998A 1998-06-05 1998-06-05 Coil capable of reducing leakage flux and its manufacture Pending JPH11354327A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17207998A JPH11354327A (en) 1998-06-05 1998-06-05 Coil capable of reducing leakage flux and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17207998A JPH11354327A (en) 1998-06-05 1998-06-05 Coil capable of reducing leakage flux and its manufacture

Publications (1)

Publication Number Publication Date
JPH11354327A true JPH11354327A (en) 1999-12-24

Family

ID=15935154

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17207998A Pending JPH11354327A (en) 1998-06-05 1998-06-05 Coil capable of reducing leakage flux and its manufacture

Country Status (1)

Country Link
JP (1) JPH11354327A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1250828A1 (en) * 2000-01-13 2002-10-23 Sonion Microtronic Nederland B.V. Packaging and rf shielding for telecoils
JP2011155158A (en) * 2010-01-28 2011-08-11 Hitachi Ltd Hybrid wound cord, and hybrid current transformer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1250828A1 (en) * 2000-01-13 2002-10-23 Sonion Microtronic Nederland B.V. Packaging and rf shielding for telecoils
EP1250828A4 (en) * 2000-01-13 2006-08-02 Sonion Microtronic Nederland B Packaging and rf shielding for telecoils
JP2011155158A (en) * 2010-01-28 2011-08-11 Hitachi Ltd Hybrid wound cord, and hybrid current transformer

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