JP4720286B2 - Coil parts - Google Patents

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JP4720286B2
JP4720286B2 JP2005146247A JP2005146247A JP4720286B2 JP 4720286 B2 JP4720286 B2 JP 4720286B2 JP 2005146247 A JP2005146247 A JP 2005146247A JP 2005146247 A JP2005146247 A JP 2005146247A JP 4720286 B2 JP4720286 B2 JP 4720286B2
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magnetic core
coil
terminal
holding member
magnetic
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JP2006324459A (en
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睦泰 大坪
一彰 大西
秀典 植松
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Description

本発明は各種電子機器、通信機器等に利用されるコイル部品に関するものである。   The present invention relates to a coil component used in various electronic devices, communication devices, and the like.

以下、従来の技術について図面を参照しながら説明する。   Hereinafter, a conventional technique will be described with reference to the drawings.

図５は自動車エンジンの燃料噴射装置を制御する制御システム全体を示すブロック図、図６は同制御システムの制御コントロール部における電源部の回路図、図７は同コイル部品の断面図、図８は同コイル部品の斜視図である。   FIG. 5 is a block diagram showing the entire control system for controlling the fuel injection device of the automobile engine, FIG. 6 is a circuit diagram of a power supply unit in the control control unit of the control system, FIG. 7 is a sectional view of the coil components, and FIG. It is a perspective view of the coil component.

図５において、自動車エンジンの燃料噴射装置を制御する制御システムは、バッテリー１から駆動用の電流を供給された制御コントロール部２が、エンジンの燃料噴射装置３を制御している。制御コントロール部２には、燃料噴射装置の噴射量や噴射タイミングを計算・制御するＣＰＵ４と、このＣＰＵ４に電流を供給する電源部５とが設けられている。   In FIG. 5, in the control system for controlling the fuel injection device of the automobile engine, the control control unit 2 to which the driving current is supplied from the battery 1 controls the fuel injection device 3 of the engine. The control control unit 2 is provided with a CPU 4 that calculates and controls the injection amount and injection timing of the fuel injection device, and a power supply unit 5 that supplies current to the CPU 4.

この電源部５には、図６に示すように、コイル部品６、コンデンサ部品７とからなるフィルタ部８と、コイル部品６、コンデンサ部品７、ＩＣ９、スイッチング部品１０とからなるＤＣ／ＤＣコンバータ回路部１１とを互いに接続しており、バッテリー１側のバッテリー用端子１２にはフィルタ部８を、ＣＰＵ４側のＣＰＵ用端子１３にはＤＣ／ＤＣコンバータ回路部１１を接続している。特に、ＤＣ／ＤＣコンバータ回路部１１に用いるコイル部品６はスイッチング部品１０によってスイッチング駆動させられ、ＤＣ／ＤＣコンバータ回路部１１において、バッテリー１の１２Ｖ電圧をＣＰＵ４用として、１．５〜５Ｖ程度に降圧している。   As shown in FIG. 6, the power supply unit 5 includes a filter unit 8 including a coil component 6 and a capacitor component 7, and a DC / DC converter circuit including a coil component 6, a capacitor component 7, an IC 9, and a switching component 10. The filter unit 8 is connected to the battery terminal 12 on the battery 1 side, and the DC / DC converter circuit unit 11 is connected to the CPU terminal 13 on the CPU 4 side. In particular, the coil component 6 used for the DC / DC converter circuit unit 11 is driven to be switched by the switching component 10, and the DC / DC converter circuit unit 11 sets the 12 V voltage of the battery 1 to about 1.5 to 5 V for the CPU 4. I have a pressure drop.

このようなＤＣ／ＤＣコンバータ回路部１１に用いるコイル部品６の１つとしては、図７、図８に示すように、巻軸部１３の両端に鍔を有するドラム状のドラム磁心１４と、このドラム磁心１４の巻軸部１３に巻回したコイル１５と、このコイル１５を被覆するように、ドラム磁心１４に組み合わせたリング状のリング磁心１６と、このコイル１５を電気的に接続した端子１７とを備えたものがある。このコイル１５は、丸線からなる導線を螺旋状に巻回して形成したものであり、その引き出し線１８はＬ字状の端子１７の一端に絡げている。   As one of the coil components 6 used for such a DC / DC converter circuit section 11, as shown in FIGS. 7 and 8, a drum-shaped drum magnetic core 14 having hooks at both ends of a winding shaft section 13, and this A coil 15 wound around the winding shaft portion 13 of the drum magnetic core 14, a ring-shaped ring magnetic core 16 combined with the drum magnetic core 14 so as to cover the coil 15, and a terminal 17 electrically connected to the coil 15. There is something with. The coil 15 is formed by winding a conducting wire made of a round wire in a spiral shape, and the lead wire 18 is wound around one end of an L-shaped terminal 17.

また、ドラム磁心１４およびリング磁心１６はフェライト材料からなり、ドラム磁心１４とリング磁心１６とは接着剤１９を塗布して一体化している。   The drum magnetic core 14 and the ring magnetic core 16 are made of a ferrite material, and the drum magnetic core 14 and the ring magnetic core 16 are integrated by applying an adhesive 19.

なお、この出願の発明に関する先行技術文献情報としては、例えば、特許文献１が知られている。
特開２００２−６４０２４号公報 As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP 2002-64024 A

上記従来のコイル部品は、自動車のエンジン近傍のＤＣ／ＤＣコンバータ回路部１１に用いるので、耐熱性が要求される。しかし、上記コイル部品は、ドラム磁心１４とリング磁心１６とを接着剤１９を塗布して一体化しているので、この接着剤１９の耐熱温度によっては接着剤１９が溶融して信頼性が劣化するという問題点を有していた。   Since the conventional coil component is used in the DC / DC converter circuit unit 11 in the vicinity of the automobile engine, heat resistance is required. However, in the coil component, since the drum magnetic core 14 and the ring magnetic core 16 are integrated by applying the adhesive 19, the adhesive 19 melts depending on the heat resistant temperature of the adhesive 19 and the reliability deteriorates. It had the problem that.

本発明は上記問題点を解決するために、接着剤の耐熱性を考慮する必要がないように、耐熱性を向上したコイル部品を提供することを目的としている。   In order to solve the above-described problems, an object of the present invention is to provide a coil component with improved heat resistance so that it is not necessary to consider the heat resistance of an adhesive.

上記目的を達成するために本発明は以下の構成を有する。   In order to achieve the above object, the present invention has the following configuration.

本発明は、磁性材料を粉末にして表面を絶縁被膜で覆い、結合剤を混ぜて加圧成形した磁心と、前記磁心に埋設したコイルと、前記コイルの端部を磁心の側面から突出させ、前記コイルの端部を保持する金属板からなる保持部材と重ね合わせて一体的にするとともに前記磁心の側面から下面に向けて折曲することにより形成した端子とを備え、前記磁心の側面に、前記コイルの端部が突出した部分から下面に向けて前記端子と対向する位置に凹部を設け、前記端子に、前記磁心の側面に位置する前記保持部材のうち、前記磁心から突出した側に前記対向する凹部の幅よりも広い幅に延設した幅広部を設けており、前記幅広部を前記磁心の側面に隣接させるとともに前記凹部の内壁面と前記端子との間に空間を形成した構成である。 In the present invention, a magnetic material is powdered, the surface is covered with an insulating coating, a magnetic core formed by pressing a binder and mixed, a coil embedded in the magnetic core, and an end of the coil projecting from the side surface of the magnetic core, and a terminal formed by bending towards the bottom surface from the side surface of the integrally to Rutotomoni the core by superposing a holding member made of a metal plate for holding an end portion of the coil, the side surfaces of the core The concave portion is provided at a position facing the terminal from the portion where the end portion of the coil protrudes toward the lower surface, and the terminal is provided on the side protruding from the magnetic core among the holding members positioned on the side surfaces of the magnetic core. A configuration in which a wide portion extending to a width wider than the width of the opposing concave portion is provided, the wide portion is adjacent to a side surface of the magnetic core, and a space is formed between the inner wall surface of the concave portion and the terminal. It is.

上記構成により、コイルは磁性材料を粉末にして表面を絶縁被膜で覆い、結合材を混ぜて加圧成形した磁心に埋設しているので、接着剤を用いずに磁心を形成でき、耐熱性を向上できる。   With the above configuration, the coil is made of a magnetic material powder, the surface is covered with an insulating coating, the binder is mixed and embedded in the pressure-molded magnetic core, so the magnetic core can be formed without using an adhesive, and heat resistance is improved. It can be improved.

特に、磁心の側面に、コイルの端部が突出した部分から下面に向けて端子と対向する位置に凹部を設け、端子に、磁心の側面に位置する保持部材のうち、磁心から突出した側に対向する凹部の幅よりも広い幅に延設した幅広部を設けており、幅広部を磁心の側面に隣接させるとともに凹部の内壁面とコイルの端部との間に空間を形成しているので、コイルの端部を端子として用いても、実装時における実装基板と磁心との熱膨張係数の差に起因した端子への熱応力を吸収できる。すなわち、端子と磁心の凹部の内壁面との間には空間を形成しているので、この空間によって端子が可動して応力を吸収できるとともに、凹部の幅よりも広い幅広部によって端子が位置規制されるので、必要以上に端子が可動することもない。 In particular, a concave portion is provided on the side surface of the magnetic core at a position facing the terminal from the portion where the end of the coil protrudes toward the lower surface, and the terminal has a holding member positioned on the side surface of the magnetic core on the side protruding from the magnetic core. Since a wide part extending to a width wider than the width of the opposing concave part is provided, the wide part is adjacent to the side surface of the magnetic core and a space is formed between the inner wall surface of the concave part and the end of the coil . Even if the end of the coil is used as a terminal, the thermal stress applied to the terminal due to the difference in thermal expansion coefficient between the mounting substrate and the magnetic core during mounting can be absorbed. That is, since between the inner wall surface of the recess of the terminal and the magnetic core forms a space together with the terminal can absorb the stress by the movable This space, position regulation pin by wider wider section than the width of the recess Therefore, the terminal does not move more than necessary.

さらに、コイルの端部は保持部材に重ね合わせるとともに折曲加工しているので、コイルが導線を螺旋状に巻回したものであっても、保持部材によって的確にコイルの端部の位置決めができる。   Further, since the end of the coil is overlapped with the holding member and is bent, the end of the coil can be accurately positioned by the holding member even if the coil is formed by winding a conductive wire in a spiral shape. .

以下、実施の形態を用いて、本発明の全請求項に記載の発明について図面を参照しながら説明する。   In the following, embodiments of the present invention will be described with reference to the drawings.

図１は本発明の一実施の形態におけるコイル部品の斜視図、図２は同コイル部品の実装状態を示す断面図、図３は同コイル部品のコイルの斜視図、図４は同コイル部品の製造工程の一部を示す工程図である。   1 is a perspective view of a coil component according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a mounting state of the coil component, FIG. 3 is a perspective view of a coil of the coil component, and FIG. It is process drawing which shows a part of manufacturing process.

図１〜図３において、本発明のコイル部品は、磁性材料を粉末にして表面を絶縁被膜で覆い、結合剤を混ぜて加圧成形した磁心２０と、導線を螺旋状に巻回して形成し、磁心２０に埋設するとともに磁心２０から端部を突出させたコイル２２と、このコイル２２の端部を保持する保持部材２３と、磁心２０の側面に配置した端子２４とを備えている。   1 to 3, the coil component of the present invention is formed by magnetically powdering a magnetic material, covering the surface with an insulating film, mixing a binder, and press-molding the magnetic core 20, and winding a conductive wire in a spiral shape. The coil 22 is embedded in the magnetic core 20 and has an end protruding from the magnetic core 20, a holding member 23 that holds the end of the coil 22, and a terminal 24 disposed on the side surface of the magnetic core 20.

また、端子２４は、コイル２２の端部を保持部材２３に重ね合わせるとともに磁心２０の側面から下面に向かって折曲加工して形成している。保持部材２３は金属として、保持部材２３とコイル２２の端部とを電気的に接続することにより、これらが一体的となった端子２４を形成している。   The terminal 24 is formed by overlapping the end portion of the coil 22 on the holding member 23 and bending the side surface of the magnetic core 20 from the bottom surface. The holding member 23 is made of metal, and the holding member 23 and the end of the coil 22 are electrically connected to form a terminal 24 in which these are integrated.

さらに、磁心２０の側面に、コイル２２の端部が突出した部分から下面に向けて端子２４と対向する位置に凹部２５を設け、端子２４に、磁心２０の側面に位置する保持部材２３のうち、磁心２０から突出した側に対向する凹部２５の幅よりも広い幅に延設した幅広部２６を設けており、幅広部２６を磁心２０の側面に隣接させるとともに凹部２５の内壁面２７とコイル２２の端部との間に空間２８を形成している。 Further, a concave portion 25 is provided on the side surface of the magnetic core 20 at a position facing the terminal 24 from the portion where the end portion of the coil 22 protrudes toward the lower surface, and the terminal 24 includes the holding member 23 positioned on the side surface of the magnetic core 20. The wide portion 26 is provided so as to extend wider than the width of the concave portion 25 facing the side protruding from the magnetic core 20, the wide portion 26 is adjacent to the side surface of the magnetic core 20, and the inner wall surface 27 of the concave portion 25 and the coil are provided. A space 28 is formed between the end portions of 22.

そして、端子２４に形成された幅広部２６よりも下方の位置を半田接合部２９として、端子２４に半田３０を塗布して上記のコイル部品を実装基板３２に実装する。   Then, the position below the wide portion 26 formed on the terminal 24 is used as a solder joint portion 29, solder 30 is applied to the terminal 24, and the coil component is mounted on the mounting substrate 32.

上記コイル部品の製造方法は次の通りである。   The manufacturing method of the coil component is as follows.

図４（ａ）は２つの圧粉体でコイルを挟み込むように金型で再加圧成形する状態を示す工程図、図４（ｂ）は同金型で再加圧成形を完了した状態を示す工程図であり、この図４（ａ）、（ｂ）に示すように、磁心２０は、熱硬化性樹脂を含有した結合剤と磁性材料を粉末にした磁性粉末とを熱硬化性樹脂が完全硬化しない非加熱状態で混合して加圧成形した２つの圧粉体３４を、コイル２２を挟み込むように金型３６で再加圧成形して、圧粉体３４でコイル２２を被覆するとともに熱硬化性樹脂が完全硬化するように加熱して成形している。   FIG. 4A is a process diagram showing a state where re-press molding is performed with a mold so that a coil is sandwiched between two green compacts, and FIG. 4B is a state where re-press molding is completed with the same mold. 4 (a) and 4 (b), the magnetic core 20 is composed of a binder containing a thermosetting resin and a magnetic powder obtained by powdering a magnetic material. The two green compacts 34 mixed and pressure-molded in a non-heated state that is not completely cured are re-press-molded with a mold 36 so as to sandwich the coil 22, and the coil 22 is covered with the green compact 34. It is molded by heating so that the thermosetting resin is completely cured.

この際、加圧成形時の加圧力よりも再加圧成形時の加圧力を大きくしており、圧粉体３４を成形する加圧成形時の加圧力は０．５〜１ｔｏｎ／ｃｍ2程度で、圧粉体３４から磁心２０を成形する再加圧成形時の加圧力は３〜５ｔｏｎ／ｃｍ2程度である。 At this time, the pressing force at the time of re-pressing molding is larger than the pressing force at the time of pressure molding, and the pressing force at the time of pressing molding the green compact 34 is about 0.5 to 1 ton / cm 2. Thus, the pressure applied at the time of re-pressure molding for molding the magnetic core 20 from the green compact 34 is about 3 to 5 ton / cm 2 .

上記構成により、コイル２２は磁性材料を粉末にして表面を絶縁被膜で覆い、結合材を混ぜて加圧成形した磁心２０に埋設しているので、接着剤を用いずに磁心を形成でき、耐熱性を向上できる。   With the above configuration, the coil 22 is made of a magnetic material, covered with an insulating film, embedded in a magnetic core 20 formed by pressing a binder and mixed, so that a magnetic core can be formed without using an adhesive, Can be improved.

また、磁心２０の側面に、コイル２２の端部が突出した部分から折曲加工した端子２４と対向する位置に凹部２５を設け、端子２４に、磁心２０の側面に位置する保持部材２３のうち、磁心２０から突出した側に対向する凹部２５の幅よりも広い幅に延設した幅広部２６を設けており、幅広部２６を磁心２０の側面に隣接させるとともに凹部２５の内壁面２７とコイル２２の端部との間に空間２８を形成しているので、コイル２２の端部を端子２４として用いても、実装時における実装基板３２と磁心２０との熱膨張係数の差に起因した端子２４への熱応力を吸収できる。すなわち、端子２４と磁心２０の凹部２５の内壁面２７との間に空間２８を形成しているので、この空間２８によって端子２４が可動して応力を吸収できるとともに、凹部２５の幅よりも広い幅広部２６によって端子２４が位置規制されるので、必要以上に端子が可動することもない。 Further , a concave portion 25 is provided on the side surface of the magnetic core 20 at a position facing the terminal 24 bent from the portion where the end of the coil 22 protrudes, and the terminal 24 includes a holding member 23 positioned on the side surface of the magnetic core 20. The wide portion 26 is provided so as to extend wider than the width of the concave portion 25 facing the side protruding from the magnetic core 20, the wide portion 26 is adjacent to the side surface of the magnetic core 20, and the inner wall surface 27 of the concave portion 25 and the coil are provided. Since the space 28 is formed between the end portion of the coil 22 and the end portion of the coil 22 is used as the terminal 24, the terminal caused by the difference in thermal expansion coefficient between the mounting substrate 32 and the magnetic core 20 at the time of mounting. The thermal stress to 24 can be absorbed. That is, since the form spatial 28 between the inner wall surface 27 of the recess 25 of the terminal 24 and the magnetic core 20, with terminal 24 can absorb the stress by the movable This space 28, than the width of the recess 25 Since the position of the terminal 24 is regulated by the wide wide portion 26, the terminal does not move more than necessary.

特に、コイル２２の端部は保持部材２３に重ね合わせるとともに折曲加工しているので、コイル２２が導線を螺旋状に巻回したものであっても、保持部材２３によって的確にコイル２２の端部の位置決めができる。この際、保持部材２３を金属とし、コイル２２の端部と保持部材２３とを電気的に接続することにより、これらが一体的となった端子２４を形成でき、接続信頼性が良い。   In particular, since the end portion of the coil 22 is overlapped with the holding member 23 and is bent, even if the coil 22 is formed by winding a conductive wire in a spiral shape, the end of the coil 22 is accurately detected by the holding member 23. The part can be positioned. At this time, the holding member 23 is made of metal, and the end portion of the coil 22 and the holding member 23 are electrically connected to form a terminal 24 in which these are integrated, and the connection reliability is good.

さらに、磁心２０は、熱硬化性樹脂を含有した結合剤と磁性材料を粉末にした磁性粉末とを熱硬化性樹脂が完全硬化しない非加熱状態で混合して加圧成形した複数の圧粉体３４を、コイル２２を挟み込むように再加圧成形して、圧粉体３４でコイル２２を被覆するとともに熱硬化性樹脂が完全硬化するように加熱して成形しているので、圧粉体３４とコイル２２との間を隙間なく充填して、磁気ギャップを減少させ磁気効率を向上できる。特に、加圧成形時の加圧力よりも再加圧成形時の加圧力を大きくしているので、圧粉体３４とコイル２２との間の隙間だけでなく、圧粉体３４自体に形成されている隙間も緻密に充填し、コイル２２を埋設した磁心２０全体を緻密に形成できる。   Further, the magnetic core 20 includes a plurality of green compacts obtained by pressing and molding a binder containing a thermosetting resin and a magnetic powder obtained by powdering a magnetic material in a non-heated state where the thermosetting resin is not completely cured. 34 is re-press-molded so as to sandwich the coil 22, the coil 22 is covered with the green compact 34, and the thermosetting resin is heated and molded so as to be completely cured. Between the coil 22 and the coil 22 without gaps, the magnetic gap can be reduced and the magnetic efficiency can be improved. In particular, since the pressing force at the time of re-pressing molding is larger than the pressing force at the time of pressure molding, not only the gap between the green compact 34 and the coil 22 but also the green compact 34 itself is formed. It is possible to densely form the entire magnetic core 20 in which the coil 22 is embedded, with the gaps in the gap being densely filled.

以上のように本発明にかかるコイル部品は、接着剤の耐熱性を考慮する必要がないように、耐熱性を向上するので、各種電子機器、通信機器等に適用できる。   As described above, the coil component according to the present invention improves the heat resistance so that it is not necessary to consider the heat resistance of the adhesive, and thus can be applied to various electronic devices and communication devices.

本発明の一実施の形態におけるコイル部品の斜視図The perspective view of the coil components in one embodiment of this invention 同コイル部品の実装状態の断面図Cross-sectional view of the coil component mounted state 同コイル部品のコイルの斜視図Coil perspective view of the coil component 同コイル部品の製造工程の一部を示す工程図Process diagram showing a part of the manufacturing process of the coil component 自動車エンジンの燃料噴射装置を制御する制御システム全体を示すブロック図The block diagram which shows the whole control system which controls the fuel-injection apparatus of a motor vehicle engine 同制御システムの制御コントロール部における電源部の回路図Circuit diagram of the power supply unit in the control unit of the control system 同コイル部品の断面図Cross-sectional view of the coil component 同コイル部品の斜視図Perspective view of the coil component

符号の説明Explanation of symbols

２０ 磁心
２２ コイル
２３ 保持部材
２４ 端子
２５ 凹部
２６ 幅広部
２７ 内壁面
２８ 空間
２９ 半田接合部
３０ 半田
３２ 実装基板
３４ 圧粉体
３６ 金型 DESCRIPTION OF SYMBOLS 20 Magnetic core 22 Coil 23 Holding member 24 Terminal 25 Recessed part 26 Wide part 27 Inner wall surface 28 Space 29 Solder joint part 30 Solder 32 Mounting board 34 Green compact 36 Mold

Claims (1)

磁性材料を粉末にして表面を絶縁皮膜で覆い、結合剤を混ぜて加圧成形した磁心と、前記磁心に埋設したコイルと、前記コイルの端部を前記磁心の側面から突出させ、前記コイルの端部を保持する金属板からなる保持部材と重ね合わせて一体的にするとともに前記磁心の側面から下面に向けて折曲することにより形成した端子とを備え、前記磁心の側面に、前記コイルの端部が突出した部分から下面に向けて前記端子と対向する位置に凹部を設け、前記端子に、前記磁心の側面に位置する前記保持部材のうち、前記磁心から突出した側に前記対向する凹部の幅よりも広い幅に延設した幅広部を設けており、前記幅広部を前記磁心の側面に隣接させるとともに前記凹部の内壁面と前記端子との間に空間を形成したコイル部品。 A magnetic material is powdered, the surface is covered with an insulating film, a magnetic core formed by pressing a binder and mixed, a coil embedded in the magnetic core, and an end of the coil projecting from the side surface of the magnetic core, superposing a holding member made of a metal plate for holding an end portion and a terminal formed by bending towards the bottom surface from the side surface of the integrally to Rutotomoni the core, to a side surface of the magnetic core, the coil A concave portion is provided at a position facing the terminal from a portion where the end portion protrudes toward the lower surface, and the terminal is opposed to the side of the holding member located on the side surface of the magnetic core protruding from the magnetic core. The coil component which provided the wide part extended in the width | variety wider than the width | variety of a recessed part, made the said wide part adjacent to the side surface of the said magnetic core, and formed the space between the inner wall surface of the said recessed part, and the said terminal.
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JP7428098B2 (en) 2020-07-31 2024-02-06 Tdk株式会社 Inductor parts and DC/DC converters using the same

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JPH0538826U (en) * 1991-10-26 1993-05-25 ミツミ電機株式会社 Fixed coil
JPH0555515U (en) * 1991-12-25 1993-07-23 太陽誘電株式会社 Surface mount coil
JPH0579915U (en) * 1992-03-31 1993-10-29 株式会社光輪技研 Surface mount inductor
JP2001338817A (en) * 2000-05-29 2001-12-07 Matsushita Electric Ind Co Ltd Inductance element
JP2002252120A (en) * 2001-02-27 2002-09-06 Matsushita Electric Ind Co Ltd Coil component and its manufacturing method
JP2003309024A (en) * 2002-04-16 2003-10-31 Tdk Corp Coil encapsulating magnetic component and method of manufacturing the same
JP2004153068A (en) * 2002-10-31 2004-05-27 Toko Inc Dust inductor and its manufacturing method
JP2004297023A (en) * 2003-02-13 2004-10-21 Murata Mfg Co Ltd Surface mounted electronic component

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JPS57203514A (en) * 1981-06-10 1982-12-13 Masayasu Takami Hot bonding method of synthetic resin requiring high temperature
JP2711680B2 (en) * 1988-07-21 1998-02-10 三信工業株式会社 Tuned throttle valve structure of multiple carburetor

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JPS57203514U (en) * 1981-06-15 1982-12-24
JPH0233421U (en) * 1988-08-24 1990-03-02
JPH0538826U (en) * 1991-10-26 1993-05-25 ミツミ電機株式会社 Fixed coil
JPH0555515U (en) * 1991-12-25 1993-07-23 太陽誘電株式会社 Surface mount coil
JPH0579915U (en) * 1992-03-31 1993-10-29 株式会社光輪技研 Surface mount inductor
JP2001338817A (en) * 2000-05-29 2001-12-07 Matsushita Electric Ind Co Ltd Inductance element
JP2002252120A (en) * 2001-02-27 2002-09-06 Matsushita Electric Ind Co Ltd Coil component and its manufacturing method
JP2003309024A (en) * 2002-04-16 2003-10-31 Tdk Corp Coil encapsulating magnetic component and method of manufacturing the same
JP2004153068A (en) * 2002-10-31 2004-05-27 Toko Inc Dust inductor and its manufacturing method
JP2004297023A (en) * 2003-02-13 2004-10-21 Murata Mfg Co Ltd Surface mounted electronic component

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