JP3568248B2 - Noise filter - Google Patents

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Publication number
JP3568248B2
JP3568248B2 JP22407694A JP22407694A JP3568248B2 JP 3568248 B2 JP3568248 B2 JP 3568248B2 JP 22407694 A JP22407694 A JP 22407694A JP 22407694 A JP22407694 A JP 22407694A JP 3568248 B2 JP3568248 B2 JP 3568248B2
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JP
Japan
Prior art keywords
metal foil
thin film
insulating thin
laminated
dielectric insulating
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.)
Expired - Fee Related
Application number
JP22407694A
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Japanese (ja)
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JPH0865081A (en
Inventor
真幸 高橋
三善 古内
公樹 原田
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.)
Tokin Corp
Original Assignee
NEC Tokin 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
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Priority to JP22407694A priority Critical patent/JP3568248B2/en
Publication of JPH0865081A publication Critical patent/JPH0865081A/en
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Publication of JP3568248B2 publication Critical patent/JP3568248B2/en
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  • Filters And Equalizers (AREA)
  • Coils Or Transformers For Communication (AREA)

Description

【０００１】
【産業上の利用分野】
本発明は、アルミニウムや銅等の金属箔とポリエチレンやポリエステル等の誘電率の高い絶縁薄膜を用いたノイズフィルタに関する。
【０００２】
【従来の技術】
従来のノイズフィルタは、絶縁処理した磁芯に線材を巻き回したコイル、又は線材を巻枠に巻き回し、巻枠に磁芯を組み付けたコイルとコンデンサを接続して構成されていた。この構成の場合、構成部品が多く、組立てに手間を要し、大型である等の欠点があるので、代替用のノイズフィルタとしてアルミニウム等の非磁性金属箔と誘電率の高い絶縁薄膜を積み重ねて棒状磁芯に円筒状に巻き回した、いわゆる箔巻き型のものが用いられている。
【０００３】
【発明が解決しようとする課題】
従来の箔巻き型ノイズフィルタは、２枚の通電用金属箔の間に、誘電率の高い絶縁薄膜（ポリエステル、ポリプロピレン等）を介して１枚の接地用金属箔を積み重ね、更に、通電用金属箔の片方に絶縁薄膜を重ねた積層帯体を、棒状磁芯の外周に巻き回して円筒状にし、２枚の通電用金属箔の両端（巻始めと巻終わり）からライン用のリード端子を引き出し、接地用金属箔から接地用のリード端子を引き出した構成である。２枚の通電用金属箔により、コモンモードチョークコイルが構成される。しかし、内側になった金属箔によるインダクタンスと、外側の金属箔によるインダクタンスの平衡を取ることが難しいという欠点があった。又、円筒体に巻き回したものを巻き解けないように、リード端子の向きが変わらないように、接着剤の付いた絶縁テープを巻き付ける等して緊縛する必要があり、その緊縛力を一定にすることが困難であるという欠点があった。
【０００４】
従って、本発明の課題は、上記の欠点を解消した積層帯体により形成されたコモンモードチョークコイルを持つノイズフィルタを供することにある。
【０００５】
【課題を解決するための手段】
本発明は、第一の非磁性金属箔、第一の誘電性絶縁薄膜、長さ方向に沿って中央部を切り除いて等分した第二の非磁性金属箔及び第二の誘電性絶縁薄膜を積み重ねた積層帯体を、第二の誘電性絶縁薄膜を内側にして磁芯に筒形に巻き回し、第一の非磁性金属箔を接地用、第二の非磁性金属箔の２個を通電用とすることにより、従来のインダクタンスの不均衡を除去する。
【０００６】
本発明は、積層帯体の巻終わり近くに第一の誘電性絶縁薄膜と第二の非磁性金属箔との間に形状記憶樹脂薄板を挿入し、この薄板だけを筒形の巻終わりにおいて、少なくとも１回巻き回すことにより、従来の緊縛力の欠点をなくす。
【０００７】
即ち、本発明は、第一の非磁性金属箔、第一の誘電性絶縁薄膜、中央部を長さ方向に沿って切り除いて等分した第二の非磁性金属箔及び第二の誘電性絶縁薄膜を積み重ねた積層帯体を、磁芯の外周に前記第二の誘電性絶縁薄膜を内側にして筒形に巻き回し、前記第一の非磁性金属箔にリード端子を設け、前記第二の非磁性金属箔の両端部にリード端子をそれぞれ設けたノイズフィルタにおいて、前記積層帯体の巻終わり近くに前記第二の非磁性金属箔と前記第一の誘電性絶縁薄膜の間に、前記積層薄体の外径より僅かに小さい内径寸法の円筒形に成形し、板状に展伸し、冷却して形成された、円筒形状の記憶を有する一方向性の形状記憶樹脂薄板の一端を挿入し、巻終わりにおいて前記形状記憶樹脂薄板だけで少なくとも１回巻き回して加熱し円筒形状に回復させて前記積層帯体を一定の力で緊縛したノイズフィルタである。
【０００９】
【作用】
積層帯体の等分割した第二の非磁性金属箔の２個は、完全に同等に巻き回されて、平衡のよいコモンモードチョークコイルを構成する。形状記憶樹脂薄膜は、加熱により円筒形の記憶形状に（一方向性に）戻り、第二の非磁性金属箔の巻終わりを抑えながら積層帯体の筒形に巻き回したものを一定の力で緊縛する。
【００１０】
【実施例】
本発明の実施例を図面を参照して説明する。図１は、本発明の一実施例を示す外観斜視図である。図２は、本発明の一実施例を示す一部展開斜視図である。図３は、図１の要部を模式的に示す側面図である。図４は、等価回路図である。
【００１１】
図１、図２において、磁芯１は断面円形の棒状のフェライトである。この磁芯１に、その長さより若干小さい幅寸法の積層帯体２が所要回数巻き回されている。積層帯体２は、図２に巻終わりを展開して示したように、アルミニウム、銅等の第一の非磁性金属箔（以下、第一の金属箔と称す）３と、ポリエステル等の高い誘電率を持つ第一の誘電性絶縁薄膜（以下、第一の絶縁薄膜と称す）４と、第一の金属箔３の幅寸法の半分未満の同じ幅寸法の等分割部を残して中央部を長さ方向に沿って取り除いた形状の第二の非磁性金属箔（以下、第二の金属箔と称す）５と、第二の非磁性絶縁薄膜（以下、第二の絶縁薄膜）６とを積み重ねたものである。
【００１２】
リード端子７，８は、第二の金属箔５の等分割部の巻始め端に設けられている。リード端子９，１０は、同様に巻終わり端に設けられている。リード端子１１は接地用であり、第一の金属箔３の適宜の箇所に設けられている。
【００１３】
薄板１２は形状記憶樹脂で作られており、積層帯体２より若干幅狭のものである。形状記憶樹脂とは、変形させた材料を加熱すると変形前の形に戻るという形状記憶効果を持つ熱可塑性樹脂である。ポリウレタン系、トランスポリイソプレン系樹脂等がある。薄板１２は、長さ方向の両端を若干重ね合わせた円筒形で、その内径寸法が積層帯体２の巻き回したものの外径より僅かに小さいものに形状記憶樹脂で成形し、次に、板状に展伸して冷却したものである。薄板１２は、加熱（例えば、３０℃〜７０℃）すると、形状が円筒形に回復する。薄板１２は、図２に示すように、その一端を積層帯体２の巻終わりの中央部の第一の絶縁樹脂４と、第二の金属箔５の間に挿入して積層帯体２に繋がれて積層帯体２の巻き回したものに、ほぼ１回巻き回してから加熱して、図１に示すように、形状が円筒形に戻り、積層帯体２を強く筒形に締め付ける。薄板１２の両端は、図３に巻終わりの要部側面図で模式的に示したように、積層帯体２の巻終わりの一部をリード端子９，１０と共に抑え込み、かつ巻終わりの一部を挟んで強固に重ね合う。従って、リード端子９，１０は、引き抜き外力に対して安定である。
【００１４】
このような構成の箔巻き型ノイズフィルタの等価回路図は、図４に示すようになる。Ｌ１，Ｌ２は、第二の金属箔５の等分割部によるインダクタンスであり、よく平衡したコモンモードチョークコイルである。Ｃ１，Ｃ２は、第一の金属箔３と第二の金属箔の等分割部との間で得られるキャパシタンスである。
【００１５】
【発明の効果】
本発明のノイズフィルタは、自動化装置で作ることができるので、安価であり、小型で、しかも従来よりも特性がよく、安定した特性が得られる等の多くの利点がある。
【図面の簡単な説明】
【図１】本発明の一実施例を示す外観斜視図。
【図２】本発明の一実施例を示す一部展開斜視図。
【図３】図１の要部を模式的に示す側面図。
【図４】等価回路図。
【符号の説明】
１ 磁芯
２ 積層帯体
３ 第一の（非磁性）金属箔
４ 第一の（誘電性）絶縁薄膜
５ 第二の（非磁性）金属箔
６ 第二の（誘電性）絶縁薄膜
７，８，９，１０，１１ リード端子
１２ （形状記憶樹脂）薄板
Ｃ１，Ｃ２ キャパシタンス
Ｌ１，Ｌ２ インダクタンス[0001]
[Industrial applications]
The present invention relates to a noise filter using a metal foil such as aluminum or copper and an insulating thin film having a high dielectric constant such as polyethylene or polyester.
[0002]
[Prior art]
A conventional noise filter has been configured by winding a wire around an insulated magnetic core, or winding a wire around a bobbin, and connecting a coil with the magnetic core assembled to the bobbin and a capacitor. In the case of this configuration, there are disadvantages such as a large number of components, time and labor required for assembly, and a large size.Therefore, a non-magnetic metal foil such as aluminum and an insulating thin film having a high dielectric constant are stacked as an alternative noise filter. A so-called foil-winding type wound around a rod-shaped magnetic core in a cylindrical shape is used.
[0003]
[Problems to be solved by the invention]
In a conventional foil-wound noise filter, one grounding metal foil is stacked between two current-carrying metal foils via an insulating thin film having a high dielectric constant (polyester, polypropylene, or the like). A laminated strip in which an insulating thin film is laminated on one side of a foil is wound around the outer periphery of a rod-shaped magnetic core, and is formed into a cylindrical shape. From both ends (start and end of winding) of the two conducting metal foils, lead terminals for lines are provided. This is a configuration in which a grounding lead terminal is drawn out of a drawing and grounding metal foil. A common mode choke coil is formed by the two conductive metal foils. However, there is a disadvantage that it is difficult to balance the inductance of the inner metal foil with the inductance of the outer metal foil. In addition, it is necessary to bind the insulating tape with an adhesive so that the direction of the lead terminals does not change so that the material wound around the cylindrical body cannot be unwound. There is a disadvantage that it is difficult to do.
[0004]
Therefore, an object of the present invention is to provide a noise filter having a common mode choke coil formed by a laminated band which has solved the above-mentioned disadvantages.
[0005]
[Means for Solving the Problems]
The present invention includes a first non-magnetic metal foil, a first dielectric insulating thin film, the second non-magnetic metal Haku及 beauty second dielectric obtained by equally dividing the exception off the central portion along the longitudinal direction The laminated strip having the insulating thin films stacked thereon is wound in a cylindrical shape around a magnetic core with the second dielectric insulating thin film inside, the first non-magnetic metal foil is grounded, and the second non-magnetic metal foil is The use of the current-carrying pieces eliminates the conventional inductance imbalance.
[0006]
The present invention inserts a shape memory resin thin plate between the first dielectric insulating thin film and the second non-magnetic metal foil near the end of the winding of the laminated strip, and only this thin plate at the end of the cylindrical shape, The at least one winding eliminates the disadvantages of conventional binding forces.
[0007]
That is, the present invention provides a first non-magnetic metal foil, a first dielectric insulating thin film, a second non-magnetic metal foil and a second dielectric material, the center of which is cut along the length direction and equally divided. A laminated band body in which insulating thin films are stacked is wound in a cylindrical shape around the magnetic core with the second dielectric insulating thin film inside, and a lead terminal is provided on the first nonmagnetic metal foil, In the noise filter provided with lead terminals at both ends of the non-magnetic metal foil of the above, between the second non-magnetic metal foil and the first dielectric insulating thin film near the end of the winding of the laminated strip , the One end of a one-way shape memory resin sheet having a cylindrical memory , formed into a cylindrical shape with an inner diameter slightly smaller than the outer diameter of the laminated thin body, expanded into a plate shape, and cooled. Insert and heat at the end of winding at least once with the shape memory resin sheet alone A noise filter that tied the laminated strip body at a constant force to restore the cylindrical shape.
[0009]
[Action]
The two equally divided second non-magnetic metal foils of the laminated strip are wound completely identically to form a well-balanced common mode choke coil. The shape memory resin thin film returns to a cylindrical memory shape (one-way) by heating, and a constant force is applied to the shape of the laminated non-magnetic metal foil wound in a cylindrical shape while suppressing the end of winding. Tied up with.
[0010]
【Example】
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view showing one embodiment of the present invention. FIG. 2 is a partially exploded perspective view showing one embodiment of the present invention. FIG. 3 is a side view schematically showing a main part of FIG. FIG. 4 is an equivalent circuit diagram.
[0011]
1 and 2, the magnetic core 1 is a rod-shaped ferrite having a circular cross section. A laminated band 2 having a width slightly smaller than the length of the magnetic core 1 is wound around the magnetic core 1 a required number of times. As shown in FIG. 2, the end of the roll is expanded and shown in FIG. 2, the first non-magnetic metal foil (hereinafter, referred to as the first metal foil) 3 such as aluminum or copper and the high-strength material such as polyester. A first dielectric insulating thin film having a dielectric constant (hereinafter, referred to as a first insulating thin film) 4 and a central portion leaving an equally divided portion having the same width dimension less than half the width dimension of the first metal foil 3 A second non-magnetic metal foil (hereinafter, referred to as a second metal foil) 5, a second non-magnetic insulating thin film (hereinafter, a second insulating thin film ) 6, and Are piled up.
[0012]
The lead terminals 7 and 8 are provided at the winding start ends of the equally divided portions of the second metal foil 5. The lead terminals 9 and 10 are similarly provided at the end of winding. The lead terminals 11 are for grounding, and are provided at appropriate locations on the first metal foil 3.
[0013]
The thin plate 12 is made of a shape memory resin and is slightly narrower than the laminated band 2. The shape memory resin is a thermoplastic resin having a shape memory effect such that when a deformed material is heated, it returns to a shape before deformation. Examples include polyurethane-based and trans-polyisoprene-based resins. The thin plate 12 is formed in a cylindrical shape in which both ends in the longitudinal direction are slightly overlapped with each other, and the inner diameter of the thin plate 12 is slightly smaller than the outer diameter of the wound product of the laminated band body 2 using a shape memory resin. It was spread out and cooled. When the thin plate 12 is heated (for example, 30 ° C. to 70 ° C.), the shape recovers to a cylindrical shape. As shown in FIG. 2, one end of the thin plate 12 is inserted between the first insulating resin 4 at the center of the winding end of the laminated band 2 and the second metal foil 5 to form the laminated plate 2. After being wound substantially once around the connected laminated band 2, the shape is returned to a cylindrical shape as shown in FIG. 1, and the laminated band 2 is strongly tightened into a cylindrical shape. Both ends of the thin plate 12 hold a part of the winding end of the laminated strip 2 together with the lead terminals 9 and 10 as shown schematically in FIG. And firmly overlap each other. Therefore, the lead terminals 9 and 10 are stable against an external pulling force.
[0014]
FIG. 4 shows an equivalent circuit diagram of the foil-wound noise filter having such a configuration. L 1 and L 2 are inductances of the equally divided portions of the second metal foil 5 and are well-balanced common mode choke coils. C 1 and C 2 are capacitances obtained between the first metal foil 3 and the equally divided portions of the second metal foil.
[0015]
【The invention's effect】
The noise filter of the present invention has many advantages such as being inexpensive, small in size, and having better characteristics and more stable characteristics than the conventional one, since it can be made by an automation device.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing one embodiment of the present invention.
FIG. 2 is a partially exploded perspective view showing one embodiment of the present invention.
FIG. 3 is a side view schematically showing a main part of FIG. 1;
FIG. 4 is an equivalent circuit diagram.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 magnetic core 2 laminated strip 3 first (non-magnetic) metal foil 4 first ( dielectric ) insulating thin film 5 second (non-magnetic) metal foil 6 second (dielectric) insulating thin film 7, 8 , 9, 10, 11 Lead terminal 12 (shape memory resin) Thin plate C1, C2 Capacitance L1, L2 Inductance

Claims (1)

第一の非磁性金属箔、第一の誘電性絶縁薄膜、中央部を長さ方向に沿って切り除いて等分した第二の非磁性金属箔及び第二の誘電性絶縁薄膜を積み重ねた積層帯体を、磁芯の外周に前記第二の誘電性絶縁薄膜を内側にして筒形に巻き回し、前記第一の非磁性金属箔にリード端子を設け、前記第二の非磁性金属箔の両端部にリード端子をそれぞれ設けたノイズフィルタにおいて、前記積層帯体の巻終わり近くに前記第二の非磁性金属箔と前記第一の誘電性絶縁薄膜の間に、前記積層薄体の外径より僅かに小さい内径寸法の円筒形に成形し、板状に展伸し、冷却して形成された、円筒形状の記憶を有する一方向性の形状記憶樹脂薄板の一端を挿入し、巻終わりにおいて前記形状記憶樹脂薄板だけで少なくとも１回巻き回して加熱し円筒形状に回復させて前記積層帯体を一定の力で緊縛したノイズフィルタ。A laminate in which a first nonmagnetic metal foil, a first dielectric insulating thin film, a second nonmagnetic metal foil and a second dielectric insulating thin film which are cut off at the center along the length direction and equally divided are stacked. The band is wound around the outer periphery of a magnetic core in a cylindrical shape with the second dielectric insulating thin film inside, a lead terminal is provided on the first non-magnetic metal foil, and the second non-magnetic metal foil is provided with a lead terminal. In a noise filter having lead terminals at both ends , an outer diameter of the laminated thin body is provided between the second non-magnetic metal foil and the first dielectric insulating thin film near the end of winding of the laminated band. One end of a unidirectional shape memory resin sheet having a cylindrical memory , formed into a cylindrical shape with a slightly smaller inner diameter, expanded into a plate shape, and cooled, is inserted at the end of winding. Rolled at least once with the shape memory resin thin plate alone and heated to recover to a cylindrical shape Noise filters tied the laminated strip body with a constant force by.
JP22407694A 1994-08-24 1994-08-24 Noise filter Expired - Fee Related JP3568248B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22407694A JP3568248B2 (en) 1994-08-24 1994-08-24 Noise filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22407694A JP3568248B2 (en) 1994-08-24 1994-08-24 Noise filter

Publications (2)

Publication Number Publication Date
JPH0865081A JPH0865081A (en) 1996-03-08
JP3568248B2 true JP3568248B2 (en) 2004-09-22

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004158788A (en) * 2002-11-08 2004-06-03 Tokyo Coil Engineering Kk Insulating tape
JP2005102167A (en) * 2003-08-21 2005-04-14 Hioki Ee Corp Filter element
US7148768B2 (en) * 2003-08-21 2006-12-12 Hioki Denki Kabushiki Kaisha Filter element
JP2005160058A (en) * 2003-11-05 2005-06-16 Hioki Ee Corp Filter element
JP2006094074A (en) * 2004-09-24 2006-04-06 Hioki Ee Corp Filter element
JP2006148762A (en) * 2004-11-24 2006-06-08 Hioki Ee Corp Filter element

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